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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 return rc;
1622 }
1623 }
1624 else if (sx->dane_required)
1625 {
1626 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1627 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1628 FAIL, FALSE);
1629 return FAIL;
1630 }
1631 }
1632 #endif /*DANE*/
1633
1634 /* Make the TCP connection */
1635
1636 sx->inblock.sock = sx->outblock.sock =
1637 smtp_connect(sx->host, sx->host_af, sx->interface,
1638 sx->ob->connect_timeout, sx->tblock);
1639
1640 if (sx->inblock.sock < 0)
1641 {
1642 uschar * msg = NULL;
1643 if (sx->verify)
1644 {
1645 msg = US strerror(errno);
1646 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1647 }
1648 set_errno_nohost(sx->addrlist,
1649 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1650 sx->verify ? string_sprintf("could not connect: %s", msg)
1651 : NULL,
1652 DEFER, FALSE);
1653 sx->send_quit = FALSE;
1654 return DEFER;
1655 }
1656
1657 /* Expand the greeting message while waiting for the initial response. (Makes
1658 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1659 delayed till here so that $sending_interface and $sending_port are set. */
1660
1661 if (sx->helo_data)
1662 if (!(sx->helo_data = expand_string(sx->helo_data)))
1663 if (sx->verify)
1664 log_write(0, LOG_MAIN|LOG_PANIC,
1665 "<%s>: failed to expand transport's helo_data value for callout: %s",
1666 sx->addrlist->address, expand_string_message);
1667
1668 #ifdef SUPPORT_I18N
1669 if (sx->helo_data)
1670 {
1671 expand_string_message = NULL;
1672 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1673 &expand_string_message)),
1674 expand_string_message)
1675 if (sx->verify)
1676 log_write(0, LOG_MAIN|LOG_PANIC,
1677 "<%s>: failed to expand transport's helo_data value for callout: %s",
1678 sx->addrlist->address, expand_string_message);
1679 else
1680 sx->helo_data = NULL;
1681 }
1682 #endif
1683
1684 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1685 is nevertheless a reasonably clean way of programming this kind of logic,
1686 where you want to escape on any error. */
1687
1688 if (!sx->smtps)
1689 {
1690 BOOL good_response;
1691
1692 #ifdef TCP_QUICKACK
1693 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1694 #endif
1695 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1696 '2', sx->ob->command_timeout);
1697 #ifdef EXPERIMENTAL_DSN_INFO
1698 sx->smtp_greeting = string_copy(sx->buffer);
1699 #endif
1700 if (!good_response) goto RESPONSE_FAILED;
1701
1702 #ifndef DISABLE_EVENT
1703 {
1704 uschar * s;
1705 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1706 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1707 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1708 if (s)
1709 {
1710 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1711 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1712 DEFER, FALSE);
1713 yield = DEFER;
1714 goto SEND_QUIT;
1715 }
1716 }
1717 #endif
1718
1719 /* Now check if the helo_data expansion went well, and sign off cleanly if
1720 it didn't. */
1721
1722 if (!sx->helo_data)
1723 {
1724 message = string_sprintf("failed to expand helo_data: %s",
1725 expand_string_message);
1726 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1727 yield = DEFER;
1728 goto SEND_QUIT;
1729 }
1730 }
1731
1732 /** Debugging without sending a message
1733 sx->addrlist->transport_return = DEFER;
1734 goto SEND_QUIT;
1735 **/
1736
1737 /* Errors that occur after this point follow an SMTP command, which is
1738 left in big_buffer by smtp_write_command() for use in error messages. */
1739
1740 smtp_command = big_buffer;
1741
1742 /* Tell the remote who we are...
1743
1744 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1745 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1746 greeting is of this form. The assumption was that the far end supports it
1747 properly... but experience shows that there are some that give 5xx responses,
1748 even though the banner includes "ESMTP" (there's a bloody-minded one that
1749 says "ESMTP not spoken here"). Cope with that case.
1750
1751 September 2000: Time has passed, and it seems reasonable now to always send
1752 EHLO at the start. It is also convenient to make the change while installing
1753 the TLS stuff.
1754
1755 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1756 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1757 would be no way to send out the mails, so there is now a host list
1758 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1759 PIPELINING problem as well. Maybe it can also be useful to cure other
1760 problems with broken servers.
1761
1762 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1763 Then somebody tried it with a Microsoft mailer... It seems that all other
1764 mailers use upper case for some reason (the RFC is quite clear about case
1765 independence) so, for peace of mind, I gave in. */
1766
1767 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1768
1769 /* Alas; be careful, since this goto is not an error-out, so conceivably
1770 we might set data between here and the target which we assume to exist
1771 and be usable. I can see this coming back to bite us. */
1772 #ifdef SUPPORT_TLS
1773 if (sx->smtps)
1774 {
1775 smtp_peer_options |= OPTION_TLS;
1776 suppress_tls = FALSE;
1777 sx->ob->tls_tempfail_tryclear = FALSE;
1778 smtp_command = US"SSL-on-connect";
1779 goto TLS_NEGOTIATE;
1780 }
1781 #endif
1782
1783 if (sx->esmtp)
1784 {
1785 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1786 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1787 goto SEND_FAILED;
1788 sx->esmtp_sent = TRUE;
1789 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1790 sx->ob->command_timeout))
1791 {
1792 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1793 {
1794 #ifdef EXPERIMENTAL_DSN_INFO
1795 sx->helo_response = string_copy(sx->buffer);
1796 #endif
1797 goto RESPONSE_FAILED;
1798 }
1799 sx->esmtp = FALSE;
1800 }
1801 #ifdef EXPERIMENTAL_DSN_INFO
1802 sx->helo_response = string_copy(sx->buffer);
1803 #endif
1804 }
1805 else
1806 DEBUG(D_transport)
1807 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1808
1809 if (!sx->esmtp)
1810 {
1811 BOOL good_response;
1812 int n = sizeof(sx->buffer);
1813 uschar * rsp = sx->buffer;
1814
1815 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1816 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1817
1818 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1819 goto SEND_FAILED;
1820 good_response = smtp_read_response(&sx->inblock, rsp, n,
1821 '2', sx->ob->command_timeout);
1822 #ifdef EXPERIMENTAL_DSN_INFO
1823 sx->helo_response = string_copy(rsp);
1824 #endif
1825 if (!good_response)
1826 {
1827 /* Handle special logging for a closed connection after HELO
1828 when had previously sent EHLO */
1829
1830 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1831 {
1832 errno = ERRNO_SMTPCLOSED;
1833 goto EHLOHELO_FAILED;
1834 }
1835 memmove(sx->buffer, rsp, Ustrlen(rsp));
1836 goto RESPONSE_FAILED;
1837 }
1838 }
1839
1840 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1841
1842 if (sx->esmtp || sx->lmtp)
1843 {
1844 sx->peer_offered = ehlo_response(sx->buffer,
1845 OPTION_TLS /* others checked later */
1846 );
1847
1848 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1849
1850 #ifdef SUPPORT_TLS
1851 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1852 #endif
1853 }
1854 }
1855
1856 /* For continuing deliveries down the same channel, having re-exec'd the socket
1857 is the standard input; for a socket held open from verify it is recorded
1858 in the cutthrough context block. Either way we don't need to redo EHLO here
1859 (but may need to do so for TLS - see below).
1860 Set up the pointer to where subsequent commands will be left, for
1861 error messages. Note that smtp_peer_options will have been
1862 set from the command line if they were set in the process that passed the
1863 connection on. */
1864
1865 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1866 as the continue goes via transport_pass_socket() and doublefork and exec.
1867 It does not wait. Unclear how we keep separate host's responses
1868 separate - we could match up by host ip+port as a bodge. */
1869
1870 else
1871 {
1872 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1873 {
1874 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1875 sx->host->port = sx->port = cutthrough.host.port;
1876 }
1877 else
1878 {
1879 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1880 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1881 }
1882 smtp_command = big_buffer;
1883 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1884
1885 /* For a continued connection with TLS being proxied for us, or a
1886 held-open verify connection with TLS, nothing more to do. */
1887
1888 if ( continue_proxy_cipher
1889 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1890 )
1891 {
1892 sx->peer_offered = smtp_peer_options;
1893 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1894 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1895 continue_proxy_cipher ? "proxied" : "verify conn with");
1896 return OK;
1897 }
1898 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1899 }
1900
1901 /* If TLS is available on this connection, whether continued or not, attempt to
1902 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1903 send another EHLO - the server may give a different answer in secure mode. We
1904 use a separate buffer for reading the response to STARTTLS so that if it is
1905 negative, the original EHLO data is available for subsequent analysis, should
1906 the client not be required to use TLS. If the response is bad, copy the buffer
1907 for error analysis. */
1908
1909 #ifdef SUPPORT_TLS
1910 if ( smtp_peer_options & OPTION_TLS
1911 && !suppress_tls
1912 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1913 && ( !sx->verify
1914 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1915 ) )
1916 {
1917 uschar buffer2[4096];
1918 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1919 goto SEND_FAILED;
1920
1921 /* If there is an I/O error, transmission of this message is deferred. If
1922 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1923 false, we also defer. However, if there is a temporary rejection of STARTTLS
1924 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1925 STARTTLS, we carry on. This means we will try to send the message in clear,
1926 unless the host is in hosts_require_tls (tested below). */
1927
1928 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1929 sx->ob->command_timeout))
1930 {
1931 if ( errno != 0
1932 || buffer2[0] == 0
1933 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1934 )
1935 {
1936 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1937 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1938 goto RESPONSE_FAILED;
1939 }
1940 }
1941
1942 /* STARTTLS accepted: try to negotiate a TLS session. */
1943
1944 else
1945 TLS_NEGOTIATE:
1946 {
1947 address_item * addr;
1948 uschar * errstr;
1949 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1950 # ifdef SUPPORT_DANE
1951 sx->dane ? &tlsa_dnsa : NULL,
1952 # endif
1953 &errstr);
1954
1955 /* TLS negotiation failed; give an error. From outside, this function may
1956 be called again to try in clear on a new connection, if the options permit
1957 it for this host. */
1958
1959 if (rc != OK)
1960 {
1961 # ifdef SUPPORT_DANE
1962 if (sx->dane) log_write(0, LOG_MAIN,
1963 "DANE attempt failed; TLS connection to %s [%s]: %s",
1964 sx->host->name, sx->host->address, errstr);
1965 # endif
1966
1967 errno = ERRNO_TLSFAILURE;
1968 message = string_sprintf("TLS session: %s", errstr);
1969 sx->send_quit = FALSE;
1970 goto TLS_FAILED;
1971 }
1972
1973 /* TLS session is set up */
1974
1975 smtp_peer_options_wrap = smtp_peer_options;
1976 for (addr = sx->addrlist; addr; addr = addr->next)
1977 if (addr->transport_return == PENDING_DEFER)
1978 {
1979 addr->cipher = tls_out.cipher;
1980 addr->ourcert = tls_out.ourcert;
1981 addr->peercert = tls_out.peercert;
1982 addr->peerdn = tls_out.peerdn;
1983 addr->ocsp = tls_out.ocsp;
1984 }
1985 }
1986 }
1987
1988 /* if smtps, we'll have smtp_command set to something else; always safe to
1989 reset it here. */
1990 smtp_command = big_buffer;
1991
1992 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1993 helo_data is null, we are dealing with a connection that was passed from
1994 another process, and so we won't have expanded helo_data above. We have to
1995 expand it here. $sending_ip_address and $sending_port are set up right at the
1996 start of the Exim process (in exim.c). */
1997
1998 if (tls_out.active >= 0)
1999 {
2000 char *greeting_cmd;
2001 BOOL good_response;
2002
2003 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2004 {
2005 uschar *message = string_sprintf("failed to expand helo_data: %s",
2006 expand_string_message);
2007 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2008 yield = DEFER;
2009 goto SEND_QUIT;
2010 }
2011
2012 /* For SMTPS we need to wait for the initial OK response. */
2013 if (sx->smtps)
2014 {
2015 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2016 '2', sx->ob->command_timeout);
2017 #ifdef EXPERIMENTAL_DSN_INFO
2018 sx->smtp_greeting = string_copy(sx->buffer);
2019 #endif
2020 if (!good_response) goto RESPONSE_FAILED;
2021 }
2022
2023 if (sx->esmtp)
2024 greeting_cmd = "EHLO";
2025 else
2026 {
2027 greeting_cmd = "HELO";
2028 DEBUG(D_transport)
2029 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2030 }
2031
2032 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2033 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2034 goto SEND_FAILED;
2035 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2036 '2', sx->ob->command_timeout);
2037 #ifdef EXPERIMENTAL_DSN_INFO
2038 sx->helo_response = string_copy(sx->buffer);
2039 #endif
2040 if (!good_response) goto RESPONSE_FAILED;
2041 smtp_peer_options = 0;
2042 }
2043
2044 /* If the host is required to use a secure channel, ensure that we
2045 have one. */
2046
2047 else if ( sx->smtps
2048 # ifdef SUPPORT_DANE
2049 || sx->dane
2050 # endif
2051 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2052 )
2053 {
2054 errno = ERRNO_TLSREQUIRED;
2055 message = string_sprintf("a TLS session is required, but %s",
2056 smtp_peer_options & OPTION_TLS
2057 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2058 goto TLS_FAILED;
2059 }
2060 #endif /*SUPPORT_TLS*/
2061
2062 /* If TLS is active, we have just started it up and re-done the EHLO command,
2063 so its response needs to be analyzed. If TLS is not active and this is a
2064 continued session down a previously-used socket, we haven't just done EHLO, so
2065 we skip this. */
2066
2067 if (continue_hostname == NULL
2068 #ifdef SUPPORT_TLS
2069 || tls_out.active >= 0
2070 #endif
2071 )
2072 {
2073 if (sx->esmtp || sx->lmtp)
2074 {
2075 sx->peer_offered = ehlo_response(sx->buffer,
2076 0 /* no TLS */
2077 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2078 | OPTION_CHUNKING
2079 | OPTION_PRDR
2080 #ifdef SUPPORT_I18N
2081 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2082 /*XXX if we hand peercaps on to continued-conn processes,
2083 must not depend on this addr */
2084 #endif
2085 | OPTION_DSN
2086 | OPTION_PIPE
2087 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2088 );
2089
2090 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2091 lmtp_ignore_quota option was set. */
2092
2093 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2094
2095 /* If the response to EHLO specified support for the SIZE parameter, note
2096 this, provided size_addition is non-negative. */
2097
2098 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2099
2100 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2101 the current host, esmtp will be false, so PIPELINING can never be used. If
2102 the current host matches hosts_avoid_pipelining, don't do it. */
2103
2104 if ( sx->peer_offered & OPTION_PIPE
2105 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2106 smtp_peer_options |= OPTION_PIPE;
2107
2108 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2109 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2110
2111 if ( sx->peer_offered & OPTION_CHUNKING
2112 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2113 sx->peer_offered &= ~OPTION_CHUNKING;
2114
2115 if (sx->peer_offered & OPTION_CHUNKING)
2116 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2117
2118 #ifndef DISABLE_PRDR
2119 if ( sx->peer_offered & OPTION_PRDR
2120 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2121 sx->peer_offered &= ~OPTION_PRDR;
2122
2123 if (sx->peer_offered & OPTION_PRDR)
2124 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2125 #endif
2126
2127 /* Note if the server supports DSN */
2128 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2129 DEBUG(D_transport) debug_printf("%susing DSN\n",
2130 sx->peer_offered & OPTION_DSN ? "" : "not ");
2131
2132 /* Note if the response to EHLO specifies support for the AUTH extension.
2133 If it has, check that this host is one we want to authenticate to, and do
2134 the business. The host name and address must be available when the
2135 authenticator's client driver is running. */
2136
2137 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2138 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2139 {
2140 default: goto SEND_QUIT;
2141 case OK: break;
2142 case FAIL_SEND: goto SEND_FAILED;
2143 case FAIL: goto RESPONSE_FAILED;
2144 }
2145 }
2146 }
2147 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2148
2149 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2150 message-specific. */
2151
2152 sx->setting_up = FALSE;
2153
2154 #ifdef SUPPORT_I18N
2155 if (sx->addrlist->prop.utf8_msg)
2156 {
2157 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2158 && !sx->addrlist->prop.utf8_downcvt_maybe;
2159 DEBUG(D_transport) if (!sx->utf8_needed)
2160 debug_printf("utf8: %s downconvert\n",
2161 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2162 }
2163
2164 /* If this is an international message we need the host to speak SMTPUTF8 */
2165 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2166 {
2167 errno = ERRNO_UTF8_FWD;
2168 goto RESPONSE_FAILED;
2169 }
2170 #endif
2171
2172 return OK;
2173
2174
2175 {
2176 int code;
2177
2178 RESPONSE_FAILED:
2179 message = NULL;
2180 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2181 sx->buffer, &code, &message, &pass_message);
2182 goto FAILED;
2183
2184 SEND_FAILED:
2185 code = '4';
2186 message = US string_sprintf("send() to %s [%s] failed: %s",
2187 sx->host->name, sx->host->address, strerror(errno));
2188 sx->send_quit = FALSE;
2189 goto FAILED;
2190
2191 EHLOHELO_FAILED:
2192 code = '4';
2193 message = string_sprintf("Remote host closed connection in response to %s"
2194 " (EHLO response was: %s)", smtp_command, sx->buffer);
2195 sx->send_quit = FALSE;
2196 goto FAILED;
2197
2198 /* This label is jumped to directly when a TLS negotiation has failed,
2199 or was not done for a host for which it is required. Values will be set
2200 in message and errno, and setting_up will always be true. Treat as
2201 a temporary error. */
2202
2203 #ifdef SUPPORT_TLS
2204 TLS_FAILED:
2205 code = '4';
2206 goto FAILED;
2207 #endif
2208
2209 /* The failure happened while setting up the call; see if the failure was
2210 a 5xx response (this will either be on connection, or following HELO - a 5xx
2211 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2212 fail all addresses, as this host is never going to accept them. For other
2213 errors during setting up (timeouts or whatever), defer all addresses, and
2214 yield DEFER, so that the host is not tried again for a while.
2215
2216 XXX This peeking for another host feels like a layering violation. We want
2217 to note the host as unusable, but down here we shouldn't know if this was
2218 the last host to try for the addr(list). Perhaps the upper layer should be
2219 the one to do set_errno() ? The problem is that currently the addr is where
2220 errno etc. are stashed, but until we run out of hosts to try the errors are
2221 host-specific. Maybe we should enhance the host_item definition? */
2222
2223 FAILED:
2224 sx->ok = FALSE; /* For when reached by GOTO */
2225 set_errno(sx->addrlist, errno, message,
2226 sx->host->next
2227 ? DEFER
2228 : code == '5'
2229 #ifdef SUPPORT_I18N
2230 || errno == ERRNO_UTF8_FWD
2231 #endif
2232 ? FAIL : DEFER,
2233 pass_message, sx->host
2234 #ifdef EXPERIMENTAL_DSN_INFO
2235 , sx->smtp_greeting, sx->helo_response
2236 #endif
2237 );
2238 yield = DEFER;
2239 }
2240
2241
2242 SEND_QUIT:
2243
2244 if (sx->send_quit)
2245 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2246
2247 #ifdef SUPPORT_TLS
2248 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2249 #endif
2250
2251 /* Close the socket, and return the appropriate value, first setting
2252 works because the NULL setting is passed back to the calling process, and
2253 remote_max_parallel is forced to 1 when delivering over an existing connection,
2254 */
2255
2256 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2257 if (sx->send_quit)
2258 {
2259 shutdown(sx->outblock.sock, SHUT_WR);
2260 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2261 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2262 rc--; /* drain socket */
2263 sx->send_quit = FALSE;
2264 }
2265 (void)close(sx->inblock.sock);
2266 sx->inblock.sock = sx->outblock.sock = -1;
2267
2268 #ifndef DISABLE_EVENT
2269 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2270 #endif
2271
2272 continue_transport = NULL;
2273 continue_hostname = NULL;
2274 return yield;
2275 }
2276
2277
2278
2279
2280 /* Create the string of options that will be appended to the MAIL FROM:
2281 in the connection context buffer */
2282
2283 static int
2284 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2285 {
2286 uschar * p = sx->buffer;
2287 address_item * addr;
2288 int address_count;
2289
2290 *p = 0;
2291
2292 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2293 send it, adding something to the message size to allow for imprecision
2294 and things that get added en route. Exim keeps the number of lines
2295 in a message, so we can give an accurate value for the original message, but we
2296 need some additional to handle added headers. (Double "." characters don't get
2297 included in the count.) */
2298
2299 if ( message_size > 0
2300 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2301 {
2302 /*XXX problem here under spool_files_wireformat?
2303 Or just forget about lines? Or inflate by a fixed proportion? */
2304
2305 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2306 while (*p) p++;
2307 }
2308
2309 #ifndef DISABLE_PRDR
2310 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2311 request that */
2312
2313 sx->prdr_active = FALSE;
2314 if (sx->peer_offered & OPTION_PRDR)
2315 for (addr = addrlist; addr; addr = addr->next)
2316 if (addr->transport_return == PENDING_DEFER)
2317 {
2318 for (addr = addr->next; addr; addr = addr->next)
2319 if (addr->transport_return == PENDING_DEFER)
2320 { /* at least two recipients to send */
2321 sx->prdr_active = TRUE;
2322 sprintf(CS p, " PRDR"); p += 5;
2323 break;
2324 }
2325 break;
2326 }
2327 #endif
2328
2329 #ifdef SUPPORT_I18N
2330 /* If it supports internationalised messages, and this meesage need that,
2331 request it */
2332
2333 if ( sx->peer_offered & OPTION_UTF8
2334 && addrlist->prop.utf8_msg
2335 && !addrlist->prop.utf8_downcvt
2336 )
2337 Ustrcpy(p, " SMTPUTF8"), p += 9;
2338 #endif
2339
2340 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2341 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2342 addr && address_count < sx->max_rcpt;
2343 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2344 {
2345 address_count++;
2346 if (!(addr->dsn_flags & rf_dsnlasthop))
2347 {
2348 sx->dsn_all_lasthop = FALSE;
2349 break;
2350 }
2351 }
2352
2353 /* Add any DSN flags to the mail command */
2354
2355 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2356 {
2357 if (dsn_ret == dsn_ret_hdrs)
2358 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2359 else if (dsn_ret == dsn_ret_full)
2360 { Ustrcpy(p, " RET=FULL"); p += 9; }
2361
2362 if (dsn_envid)
2363 {
2364 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2365 while (*p) p++;
2366 }
2367 }
2368
2369 /* If an authenticated_sender override has been specified for this transport
2370 instance, expand it. If the expansion is forced to fail, and there was already
2371 an authenticated_sender for this message, the original value will be used.
2372 Other expansion failures are serious. An empty result is ignored, but there is
2373 otherwise no check - this feature is expected to be used with LMTP and other
2374 cases where non-standard addresses (e.g. without domains) might be required. */
2375
2376 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2377 return ERROR;
2378
2379 return OK;
2380 }
2381
2382
2383 static void
2384 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2385 {
2386 uschar * p = sx->buffer;
2387 *p = 0;
2388
2389 /* Add any DSN flags to the rcpt command */
2390
2391 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2392 {
2393 if (addr->dsn_flags & rf_dsnflags)
2394 {
2395 int i;
2396 BOOL first = TRUE;
2397
2398 Ustrcpy(p, " NOTIFY=");
2399 while (*p) p++;
2400 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2401 {
2402 if (!first) *p++ = ',';
2403 first = FALSE;
2404 Ustrcpy(p, rf_names[i]);
2405 while (*p) p++;
2406 }
2407 }
2408
2409 if (addr->dsn_orcpt)
2410 {
2411 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2412 addr->dsn_orcpt);
2413 while (*p) p++;
2414 }
2415 }
2416 }
2417
2418
2419
2420 /*
2421 Return:
2422 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2423 -1 MAIL response error
2424 -2 any non-MAIL read i/o error
2425 -3 non-MAIL response timeout
2426 -4 internal error; channel still usable
2427 -5 transmit failed
2428 */
2429
2430 int
2431 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2432 {
2433 address_item * addr;
2434 int address_count;
2435 int rc;
2436
2437 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2438 {
2439 *yield = ERROR;
2440 return -4;
2441 }
2442
2443 /* From here until we send the DATA command, we can make use of PIPELINING
2444 if the server host supports it. The code has to be able to check the responses
2445 at any point, for when the buffer fills up, so we write it totally generally.
2446 When PIPELINING is off, each command written reports that it has flushed the
2447 buffer. */
2448
2449 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2450
2451 {
2452 uschar * s = sx->from_addr;
2453 #ifdef SUPPORT_I18N
2454 uschar * errstr = NULL;
2455
2456 /* If we must downconvert, do the from-address here. Remember we had to
2457 for the to-addresses (done below), and also (ugly) for re-doing when building
2458 the delivery log line. */
2459
2460 if ( sx->addrlist->prop.utf8_msg
2461 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2462 )
2463 {
2464 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2465 {
2466 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2467 *yield = ERROR;
2468 return -4;
2469 }
2470 setflag(sx->addrlist, af_utf8_downcvt);
2471 }
2472 #endif
2473
2474 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2475 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2476 }
2477
2478 mail_command = string_copy(big_buffer); /* Save for later error message */
2479
2480 switch(rc)
2481 {
2482 case -1: /* Transmission error */
2483 return -5;
2484
2485 case +1: /* Cmd was sent */
2486 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2487 sx->ob->command_timeout))
2488 {
2489 if (errno == 0 && sx->buffer[0] == '4')
2490 {
2491 errno = ERRNO_MAIL4XX;
2492 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2493 }
2494 return -1;
2495 }
2496 sx->pending_MAIL = FALSE;
2497 break;
2498
2499 /* otherwise zero: command queued for pipeline */
2500 }
2501
2502 /* Pass over all the relevant recipient addresses for this host, which are the
2503 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2504 several before we have to read the responses for those seen so far. This
2505 checking is done by a subroutine because it also needs to be done at the end.
2506 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2507 the next one if not all are sent.
2508
2509 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2510 last address because we want to abort if any recipients have any kind of
2511 problem, temporary or permanent. We know that all recipient addresses will have
2512 the PENDING_DEFER status, because only one attempt is ever made, and we know
2513 that max_rcpt will be large, so all addresses will be done at once.
2514
2515 For verify we flush the pipeline after any (the only) rcpt address. */
2516
2517 for (addr = sx->first_addr, address_count = 0;
2518 addr && address_count < sx->max_rcpt;
2519 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2520 {
2521 int count;
2522 BOOL no_flush;
2523 uschar * rcpt_addr;
2524
2525 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2526 {
2527 setflag(addr, af_tcp_fastopen_conn);
2528 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2529 }
2530
2531 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2532 ? dsn_support_yes : dsn_support_no;
2533
2534 address_count++;
2535 no_flush = pipelining_active && !sx->verify
2536 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2537
2538 build_rcptcmd_options(sx, addr);
2539
2540 /* Now send the RCPT command, and process outstanding responses when
2541 necessary. After a timeout on RCPT, we just end the function, leaving the
2542 yield as OK, because this error can often mean that there is a problem with
2543 just one address, so we don't want to delay the host. */
2544
2545 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2546
2547 #ifdef SUPPORT_I18N
2548 if ( testflag(sx->addrlist, af_utf8_downcvt)
2549 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2550 )
2551 {
2552 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2553 errno = ERRNO_EXPANDFAIL;
2554 return -5; /*XXX too harsh? */
2555 }
2556 #endif
2557
2558 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2559 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2560
2561 if (count < 0) return -5;
2562 if (count > 0)
2563 {
2564 switch(sync_responses(sx, count, 0))
2565 {
2566 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2567 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2568 break;
2569
2570 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2571 if (!sx->lmtp) /* can't tell about progress yet */
2572 sx->completed_addr = TRUE;
2573 case 0: /* No 2xx or 5xx, but no probs */
2574 break;
2575
2576 case -1: return -3; /* Timeout on RCPT */
2577 case -2: return -2; /* non-MAIL read i/o error */
2578 default: return -1; /* any MAIL error */
2579 }
2580 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2581 }
2582 } /* Loop for next address */
2583
2584 tcp_out_fastopen_logged = TRUE;
2585 sx->next_addr = addr;
2586 return 0;
2587 }
2588
2589
2590 #ifdef SUPPORT_TLS
2591 /*****************************************************
2592 * Proxy TLS connection for another transport process *
2593 ******************************************************/
2594 /*
2595 Close the unused end of the pipe, fork once more, then use the given buffer
2596 as a staging area, and select on both the given fd and the TLS'd client-fd for
2597 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2598 Do blocking full-size writes, and reads under a timeout. Once both input
2599 channels are closed, exit the process.
2600
2601 Arguments:
2602 buf space to use for buffering
2603 bufsiz size of buffer
2604 pfd pipe filedescriptor array; [0] is comms to proxied process
2605 timeout per-read timeout, seconds
2606 */
2607
2608 void
2609 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2610 {
2611 fd_set rfds, efds;
2612 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2613 int rc, i, fd_bits, nbytes;
2614
2615 close(pfd[1]);
2616 if ((rc = fork()))
2617 {
2618 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2619 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2620 }
2621
2622 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2623 set_process_info("proxying TLS connection for continued transport");
2624 FD_ZERO(&rfds);
2625 FD_SET(tls_out.active, &rfds);
2626 FD_SET(pfd[0], &rfds);
2627
2628 for (fd_bits = 3; fd_bits; )
2629 {
2630 time_t time_left = timeout;
2631 time_t time_start = time(NULL);
2632
2633 /* wait for data */
2634 efds = rfds;
2635 do
2636 {
2637 struct timeval tv = { time_left, 0 };
2638
2639 rc = select(max_fd,
2640 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2641
2642 if (rc < 0 && errno == EINTR)
2643 if ((time_left -= time(NULL) - time_start) > 0) continue;
2644
2645 if (rc <= 0)
2646 {
2647 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2648 goto done;
2649 }
2650
2651 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2652 {
2653 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2654 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2655 goto done;
2656 }
2657 }
2658 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2659
2660 /* handle inbound data */
2661 if (FD_ISSET(tls_out.active, &rfds))
2662 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2663 {
2664 fd_bits &= ~1;
2665 FD_CLR(tls_out.active, &rfds);
2666 shutdown(pfd[0], SHUT_WR);
2667 timeout = 5;
2668 }
2669 else
2670 {
2671 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2672 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2673 }
2674 else if (fd_bits & 1)
2675 FD_SET(tls_out.active, &rfds);
2676
2677 /* handle outbound data */
2678 if (FD_ISSET(pfd[0], &rfds))
2679 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2680 {
2681 fd_bits = 0;
2682 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2683 }
2684 else
2685 {
2686 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2687 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2688 goto done;
2689 }
2690 else if (fd_bits & 2)
2691 FD_SET(pfd[0], &rfds);
2692 }
2693
2694 done:
2695 if (running_in_test_harness) millisleep(100); /* let logging complete */
2696 exim_exit(0, US"TLS proxy");
2697 }
2698 #endif
2699
2700
2701 /*************************************************
2702 * Deliver address list to given host *
2703 *************************************************/
2704
2705 /* If continue_hostname is not null, we get here only when continuing to
2706 deliver down an existing channel. The channel was passed as the standard
2707 input. TLS is never active on a passed channel; the previous process always
2708 closes it down before passing the connection on.
2709
2710 Otherwise, we have to make a connection to the remote host, and do the
2711 initial protocol exchange.
2712
2713 When running as an MUA wrapper, if the sender or any recipient is rejected,
2714 temporarily or permanently, we force failure for all recipients.
2715
2716 Arguments:
2717 addrlist chain of potential addresses to deliver; only those whose
2718 transport_return field is set to PENDING_DEFER are currently
2719 being processed; others should be skipped - they have either
2720 been delivered to an earlier host or IP address, or been
2721 failed by one of them.
2722 host host to deliver to
2723 host_af AF_INET or AF_INET6
2724 defport default TCP/IP port to use if host does not specify, in host
2725 byte order
2726 interface interface to bind to, or NULL
2727 tblock transport instance block
2728 message_defer set TRUE if yield is OK, but all addresses were deferred
2729 because of a non-recipient, non-host failure, that is, a
2730 4xx response to MAIL FROM, DATA, or ".". This is a defer
2731 that is specific to the message.
2732 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2733 a second attempt after TLS initialization fails
2734
2735 Returns: OK - the connection was made and the delivery attempted;
2736 the result for each address is in its data block.
2737 DEFER - the connection could not be made, or something failed
2738 while setting up the SMTP session, or there was a
2739 non-message-specific error, such as a timeout.
2740 ERROR - a filter command is specified for this transport,
2741 and there was a problem setting it up; OR helo_data
2742 or add_headers or authenticated_sender is specified
2743 for this transport, and the string failed to expand
2744 */
2745
2746 static int
2747 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2748 uschar *interface, transport_instance *tblock,
2749 BOOL *message_defer, BOOL suppress_tls)
2750 {
2751 address_item *addr;
2752 int yield = OK;
2753 int save_errno;
2754 int rc;
2755 struct timeval start_delivery_time;
2756
2757 BOOL pass_message = FALSE;
2758 uschar *message = NULL;
2759 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2760
2761 smtp_context sx;
2762
2763 gettimeofday(&start_delivery_time, NULL);
2764 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2765 *message_defer = FALSE;
2766
2767 sx.addrlist = addrlist;
2768 sx.host = host;
2769 sx.host_af = host_af,
2770 sx.port = defport;
2771 sx.interface = interface;
2772 sx.helo_data = NULL;
2773 sx.tblock = tblock;
2774 sx.verify = FALSE;
2775
2776 /* Get the channel set up ready for a message (MAIL FROM being the next
2777 SMTP command to send */
2778
2779 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2780 return rc;
2781
2782 /* If there is a filter command specified for this transport, we can now
2783 set it up. This cannot be done until the identify of the host is known. */
2784
2785 if (tblock->filter_command)
2786 {
2787 transport_filter_timeout = tblock->filter_timeout;
2788
2789 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2790 yield ERROR. */
2791
2792 if (!transport_set_up_command(&transport_filter_argv,
2793 tblock->filter_command, TRUE, DEFER, addrlist,
2794 string_sprintf("%.50s transport", tblock->name), NULL))
2795 {
2796 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2797 FALSE);
2798 yield = ERROR;
2799 goto SEND_QUIT;
2800 }
2801
2802 if ( transport_filter_argv
2803 && *transport_filter_argv
2804 && **transport_filter_argv
2805 && sx.peer_offered & OPTION_CHUNKING
2806 )
2807 {
2808 sx.peer_offered &= ~OPTION_CHUNKING;
2809 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2810 }
2811 }
2812
2813 sx.first_addr = addrlist;
2814
2815 /* For messages that have more than the maximum number of envelope recipients,
2816 we want to send several transactions down the same SMTP connection. (See
2817 comments in deliver.c as to how this reconciles, heuristically, with
2818 remote_max_parallel.) This optimization was added to Exim after the following
2819 code was already working. The simplest way to put it in without disturbing the
2820 code was to use a goto to jump back to this point when there is another
2821 transaction to handle. */
2822
2823 SEND_MESSAGE:
2824 sx.from_addr = return_path;
2825 sx.sync_addr = sx.first_addr;
2826 sx.ok = FALSE;
2827 sx.send_rset = TRUE;
2828 sx.completed_addr = FALSE;
2829
2830
2831 /* If we are a continued-connection-after-verify the MAIL and RCPT
2832 commands were already sent; do not re-send but do mark the addrs as
2833 having been accepted up to RCPT stage. A traditional cont-conn
2834 always has a sequence number greater than one. */
2835
2836 if (continue_hostname && continue_sequence == 1)
2837 {
2838 address_item * addr;
2839
2840 sx.peer_offered = smtp_peer_options;
2841 sx.pending_MAIL = FALSE;
2842 sx.ok = TRUE;
2843 sx.next_addr = NULL;
2844
2845 for (addr = addrlist; addr; addr = addr->next)
2846 addr->transport_return = PENDING_OK;
2847 }
2848 else
2849 {
2850 /* Initiate a message transfer. */
2851
2852 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2853 {
2854 case 0: break;
2855 case -1: case -2: goto RESPONSE_FAILED;
2856 case -3: goto END_OFF;
2857 case -4: goto SEND_QUIT;
2858 default: goto SEND_FAILED;
2859 }
2860
2861 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2862 permanently or temporarily. We should have flushed and synced after the last
2863 RCPT. */
2864
2865 if (mua_wrapper)
2866 {
2867 address_item * a;
2868 unsigned cnt;
2869
2870 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2871 if (a->transport_return != PENDING_OK)
2872 {
2873 /*XXX could we find a better errno than 0 here? */
2874 set_errno_nohost(addrlist, 0, a->message, FAIL,
2875 testflag(a, af_pass_message));
2876 sx.ok = FALSE;
2877 break;
2878 }
2879 }
2880 }
2881
2882 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2883 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2884 have a good recipient buffered up if we are pipelining. We don't want to waste
2885 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2886 are pipelining. The responses are all handled by sync_responses().
2887 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2888 to send is. */
2889
2890 if ( !(sx.peer_offered & OPTION_CHUNKING)
2891 && (sx.ok || (pipelining_active && !mua_wrapper)))
2892 {
2893 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2894
2895 if (count < 0) goto SEND_FAILED;
2896 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2897 {
2898 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2899 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2900 break;
2901
2902 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2903 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2904 case 0: break; /* No 2xx or 5xx, but no probs */
2905
2906 case -1: goto END_OFF; /* Timeout on RCPT */
2907 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2908 }
2909 pipelining_active = FALSE;
2910 data_command = string_copy(big_buffer); /* Save for later error message */
2911 }
2912
2913 /* If there were no good recipients (but otherwise there have been no
2914 problems), just set ok TRUE, since we have handled address-specific errors
2915 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2916 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2917 well as body. Set the appropriate timeout value to be used for each chunk.
2918 (Haven't been able to make it work using select() for writing yet.) */
2919
2920 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2921 {
2922 /* Save the first address of the next batch. */
2923 sx.first_addr = sx.next_addr;
2924
2925 sx.ok = TRUE;
2926 }
2927 else
2928 {
2929 transport_ctx tctx = {
2930 {sx.inblock.sock},
2931 tblock,
2932 addrlist,
2933 US".", US"..", /* Escaping strings */
2934 topt_use_crlf | topt_escape_headers
2935 | (tblock->body_only ? topt_no_headers : 0)
2936 | (tblock->headers_only ? topt_no_body : 0)
2937 | (tblock->return_path_add ? topt_add_return_path : 0)
2938 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2939 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2940 };
2941
2942 /* If using CHUNKING we need a callback from the generic transport
2943 support to us, for the sending of BDAT smtp commands and the reaping
2944 of responses. The callback needs a whole bunch of state so set up
2945 a transport-context structure to be passed around. */
2946
2947 if (sx.peer_offered & OPTION_CHUNKING)
2948 {
2949 tctx.check_string = tctx.escape_string = NULL;
2950 tctx.options |= topt_use_bdat;
2951 tctx.chunk_cb = smtp_chunk_cmd_callback;
2952 sx.pending_BDAT = FALSE;
2953 sx.good_RCPT = sx.ok;
2954 sx.cmd_count = 0;
2955 tctx.smtp_context = &sx;
2956 }
2957 else
2958 tctx.options |= topt_end_dot;
2959
2960 /* Save the first address of the next batch. */
2961 sx.first_addr = sx.next_addr;
2962
2963 /* Responses from CHUNKING commands go in buffer. Otherwise,
2964 there has not been a response. */
2965
2966 sx.buffer[0] = 0;
2967
2968 sigalrm_seen = FALSE;
2969 transport_write_timeout = sx.ob->data_timeout;
2970 smtp_command = US"sending data block"; /* For error messages */
2971 DEBUG(D_transport|D_v)
2972 if (sx.peer_offered & OPTION_CHUNKING)
2973 debug_printf(" will write message using CHUNKING\n");
2974 else
2975 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2976 transport_count = 0;
2977
2978 #ifndef DISABLE_DKIM
2979 dkim_exim_sign_init();
2980 # ifdef EXPERIMENTAL_ARC
2981 {
2982 uschar * s = sx.ob->arc_sign;
2983 if (s)
2984 {
2985 if (!(sx.ob->dkim.arc_signspec = expand_string(s)))
2986 {
2987 message = US"failed to expand arc_sign";
2988 sx.ok = FALSE;
2989 goto SEND_FAILED;
2990 }
2991 /* Ask dkim code to hash the body for ARC */
2992 (void) arc_ams_setup_sign_bodyhash();
2993 sx.ob->dkim.force_bodyhash = TRUE;
2994 }
2995 }
2996 # endif
2997 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2998 #else
2999 sx.ok = transport_write_message(&tctx, 0);
3000 #endif
3001
3002 /* transport_write_message() uses write() because it is called from other
3003 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3004 it can exit with "Broken pipe" as its error. This really means that the
3005 socket got closed at the far end. */
3006
3007 transport_write_timeout = 0; /* for subsequent transports */
3008
3009 /* Failure can either be some kind of I/O disaster (including timeout),
3010 or the failure of a transport filter or the expansion of added headers.
3011 Or, when CHUNKING, it can be a protocol-detected failure. */
3012
3013 if (!sx.ok)
3014 if (message) goto SEND_FAILED;
3015 else goto RESPONSE_FAILED;
3016
3017 /* We used to send the terminating "." explicitly here, but because of
3018 buffering effects at both ends of TCP/IP connections, you don't gain
3019 anything by keeping it separate, so it might as well go in the final
3020 data buffer for efficiency. This is now done by setting the topt_end_dot
3021 flag above. */
3022
3023 smtp_command = US"end of data";
3024
3025 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3026 {
3027 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3028 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3029 {
3030 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3031 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3032 break;
3033
3034 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3035 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3036 case 0: break; /* No 2xx or 5xx, but no probs */
3037
3038 case -1: goto END_OFF; /* Timeout on RCPT */
3039 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3040 }
3041 }
3042
3043 #ifndef DISABLE_PRDR
3044 /* For PRDR we optionally get a partial-responses warning
3045 * followed by the individual responses, before going on with
3046 * the overall response. If we don't get the warning then deal
3047 * with per non-PRDR. */
3048 if(sx.prdr_active)
3049 {
3050 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3051 sx.ob->final_timeout);
3052 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3053 {
3054 case '2': sx.prdr_active = FALSE;
3055 sx.ok = TRUE;
3056 break;
3057 case '4': errno = ERRNO_DATA4XX;
3058 addrlist->more_errno |=
3059 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3060 break;
3061 }
3062 }
3063 else
3064 #endif
3065
3066 /* For non-PRDR SMTP, we now read a single response that applies to the
3067 whole message. If it is OK, then all the addresses have been delivered. */
3068
3069 if (!sx.lmtp)
3070 {
3071 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3072 sx.ob->final_timeout);
3073 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3074 {
3075 errno = ERRNO_DATA4XX;
3076 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3077 }
3078 }
3079
3080 /* For LMTP, we get back a response for every RCPT command that we sent;
3081 some may be accepted and some rejected. For those that get a response, their
3082 status is fixed; any that are accepted have been handed over, even if later
3083 responses crash - at least, that's how I read RFC 2033.
3084
3085 If all went well, mark the recipient addresses as completed, record which
3086 host/IPaddress they were delivered to, and cut out RSET when sending another
3087 message down the same channel. Write the completed addresses to the journal
3088 now so that they are recorded in case there is a crash of hardware or
3089 software before the spool gets updated. Also record the final SMTP
3090 confirmation if needed (for SMTP only). */
3091
3092 if (sx.ok)
3093 {
3094 int flag = '=';
3095 struct timeval delivery_time;
3096 int len;
3097 uschar * conf = NULL;
3098
3099 timesince(&delivery_time, &start_delivery_time);
3100 sx.send_rset = FALSE;
3101 pipelining_active = FALSE;
3102
3103 /* Set up confirmation if needed - applies only to SMTP */
3104
3105 if (
3106 #ifdef DISABLE_EVENT
3107 LOGGING(smtp_confirmation) &&
3108 #endif
3109 !sx.lmtp
3110 )
3111 {
3112 const uschar *s = string_printing(sx.buffer);
3113 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3114 conf = (s == sx.buffer)? US string_copy(s) : US s;
3115 }
3116
3117 /* Process all transported addresses - for LMTP or PRDR, read a status for
3118 each one. */
3119
3120 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3121 {
3122 if (addr->transport_return != PENDING_OK) continue;
3123
3124 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3125 remaining addresses. Otherwise, it's a return code for just the one
3126 address. For temporary errors, add a retry item for the address so that
3127 it doesn't get tried again too soon. */
3128
3129 #ifndef DISABLE_PRDR
3130 if (sx.lmtp || sx.prdr_active)
3131 #else
3132 if (sx.lmtp)
3133 #endif
3134 {
3135 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3136 sx.ob->final_timeout))
3137 {
3138 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3139 addr->message = string_sprintf(
3140 #ifndef DISABLE_PRDR
3141 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3142 #else
3143 "LMTP error after %s: %s",
3144 #endif
3145 data_command, string_printing(sx.buffer));
3146 setflag(addr, af_pass_message); /* Allow message to go to user */
3147 if (sx.buffer[0] == '5')
3148 addr->transport_return = FAIL;
3149 else
3150 {
3151 errno = ERRNO_DATA4XX;
3152 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3153 addr->transport_return = DEFER;
3154 #ifndef DISABLE_PRDR
3155 if (!sx.prdr_active)
3156 #endif
3157 retry_add_item(addr, addr->address_retry_key, 0);
3158 }
3159 continue;
3160 }
3161 sx.completed_addr = TRUE; /* NOW we can set this flag */
3162 if (LOGGING(smtp_confirmation))
3163 {
3164 const uschar *s = string_printing(sx.buffer);
3165 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3166 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3167 }
3168 }
3169
3170 /* SMTP, or success return from LMTP for this address. Pass back the
3171 actual host that was used. */
3172
3173 addr->transport_return = OK;
3174 addr->more_errno = delivery_time.tv_sec;
3175 addr->delivery_usec = delivery_time.tv_usec;
3176 addr->host_used = host;
3177 addr->special_action = flag;
3178 addr->message = conf;
3179 #ifndef DISABLE_PRDR
3180 if (sx.prdr_active) setflag(addr, af_prdr_used);
3181 #endif
3182 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3183 flag = '-';
3184
3185 #ifndef DISABLE_PRDR
3186 if (!sx.prdr_active)
3187 #endif
3188 {
3189 /* Update the journal. For homonymic addresses, use the base address plus
3190 the transport name. See lots of comments in deliver.c about the reasons
3191 for the complications when homonyms are involved. Just carry on after
3192 write error, as it may prove possible to update the spool file later. */
3193
3194 if (testflag(addr, af_homonym))
3195 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3196 else
3197 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3198
3199 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3200 len = Ustrlen(CS sx.buffer);
3201 if (write(journal_fd, sx.buffer, len) != len)
3202 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3203 "%s: %s", sx.buffer, strerror(errno));
3204 }
3205 }
3206
3207 #ifndef DISABLE_PRDR
3208 if (sx.prdr_active)
3209 {
3210 /* PRDR - get the final, overall response. For any non-success
3211 upgrade all the address statuses. */
3212 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3213 sx.ob->final_timeout);
3214 if (!sx.ok)
3215 {
3216 if(errno == 0 && sx.buffer[0] == '4')
3217 {
3218 errno = ERRNO_DATA4XX;
3219 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3220 }
3221 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3222 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3223 addr->transport_return = PENDING_OK; /* allow set_errno action */
3224 goto RESPONSE_FAILED;
3225 }
3226
3227 /* Update the journal, or setup retry. */
3228 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3229 if (addr->transport_return == OK)
3230 {
3231 if (testflag(addr, af_homonym))
3232 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3233 else
3234 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3235
3236 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3237 len = Ustrlen(CS sx.buffer);
3238 if (write(journal_fd, sx.buffer, len) != len)
3239 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3240 "%s: %s", sx.buffer, strerror(errno));
3241 }
3242 else if (addr->transport_return == DEFER)
3243 retry_add_item(addr, addr->address_retry_key, -2);
3244 }
3245 #endif
3246
3247 /* Ensure the journal file is pushed out to disk. */
3248
3249 if (EXIMfsync(journal_fd) < 0)
3250 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3251 strerror(errno));
3252 }
3253 }
3254
3255
3256 /* Handle general (not specific to one address) failures here. The value of ok
3257 is used to skip over this code on the falling through case. A timeout causes a
3258 deferral. Other errors may defer or fail according to the response code, and
3259 may set up a special errno value, e.g. after connection chopped, which is
3260 assumed if errno == 0 and there is no text in the buffer. If control reaches
3261 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3262 the problem is not related to this specific message. */
3263
3264 if (!sx.ok)
3265 {
3266 int code, set_rc;
3267 uschar * set_message;
3268
3269 RESPONSE_FAILED:
3270 {
3271 save_errno = errno;
3272 message = NULL;
3273 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3274 sx.buffer, &code, &message, &pass_message);
3275 goto FAILED;
3276 }
3277
3278 SEND_FAILED:
3279 {
3280 save_errno = errno;
3281 code = '4';
3282 message = string_sprintf("send() to %s [%s] failed: %s",
3283 host->name, host->address, message ? message : US strerror(save_errno));
3284 sx.send_quit = FALSE;
3285 goto FAILED;
3286 }
3287
3288 FAILED:
3289 {
3290 BOOL message_error;
3291
3292 sx.ok = FALSE; /* For when reached by GOTO */
3293 set_message = message;
3294
3295 /* We want to handle timeouts after MAIL or "." and loss of connection after
3296 "." specially. They can indicate a problem with the sender address or with
3297 the contents of the message rather than a real error on the connection. These
3298 cases are treated in the same way as a 4xx response. This next bit of code
3299 does the classification. */
3300
3301 switch(save_errno)
3302 {
3303 case 0:
3304 case ERRNO_MAIL4XX:
3305 case ERRNO_DATA4XX:
3306 message_error = TRUE;
3307 break;
3308
3309 case ETIMEDOUT:
3310 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3311 Ustrncmp(smtp_command,"end ",4) == 0;
3312 break;
3313
3314 case ERRNO_SMTPCLOSED:
3315 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3316 break;
3317
3318 default:
3319 message_error = FALSE;
3320 break;
3321 }
3322
3323 /* Handle the cases that are treated as message errors. These are:
3324
3325 (a) negative response or timeout after MAIL
3326 (b) negative response after DATA
3327 (c) negative response or timeout or dropped connection after "."
3328 (d) utf8 support required and not offered
3329
3330 It won't be a negative response or timeout after RCPT, as that is dealt
3331 with separately above. The action in all cases is to set an appropriate
3332 error code for all the addresses, but to leave yield set to OK because the
3333 host itself has not failed. Of course, it might in practice have failed
3334 when we've had a timeout, but if so, we'll discover that at the next
3335 delivery attempt. For a temporary error, set the message_defer flag, and
3336 write to the logs for information if this is not the last host. The error
3337 for the last host will be logged as part of the address's log line. */
3338
3339 if (message_error)
3340 {
3341 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3342
3343 /* If there's an errno, the message contains just the identity of
3344 the host. */
3345
3346 if (code == '5')
3347 set_rc = FAIL;
3348 else /* Anything other than 5 is treated as temporary */
3349 {
3350 set_rc = DEFER;
3351 if (save_errno > 0)
3352 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3353
3354 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3355
3356 *message_defer = TRUE;
3357 }
3358 }
3359
3360 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3361 ".", or some other transportation error. We defer all addresses and yield
3362 DEFER, except for the case of failed add_headers expansion, or a transport
3363 filter failure, when the yield should be ERROR, to stop it trying other
3364 hosts. */
3365
3366 else
3367 {
3368 set_rc = DEFER;
3369 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3370 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3371 }
3372 }
3373
3374 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3375 #ifdef EXPERIMENTAL_DSN_INFO
3376 , sx.smtp_greeting, sx.helo_response
3377 #endif
3378 );
3379 }
3380
3381
3382 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3383 SMTP session tidily. However, if there were too many addresses to send in one
3384 message (indicated by first_addr being non-NULL) we want to carry on with the
3385 rest of them. Also, it is desirable to send more than one message down the SMTP
3386 connection if there are several waiting, provided we haven't already sent so
3387 many as to hit the configured limit. The function transport_check_waiting looks
3388 for a waiting message and returns its id. Then transport_pass_socket tries to
3389 set up a continued delivery by passing the socket on to another process. The
3390 variable send_rset is FALSE if a message has just been successfully transfered.
3391
3392 If we are already sending down a continued channel, there may be further
3393 addresses not yet delivered that are aimed at the same host, but which have not
3394 been passed in this run of the transport. In this case, continue_more will be
3395 true, and all we should do is send RSET if necessary, and return, leaving the
3396 channel open.
3397
3398 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3399 do not want to continue with other messages down the same channel, because that
3400 can lead to looping between two or more messages, all with the same,
3401 temporarily failing address(es). [The retry information isn't updated yet, so
3402 new processes keep on trying.] We probably also don't want to try more of this
3403 message's addresses either.
3404
3405 If we have started a TLS session, we have to end it before passing the
3406 connection to a new process. However, not all servers can handle this (Exim
3407 can), so we do not pass such a connection on if the host matches
3408 hosts_nopass_tls. */
3409
3410 DEBUG(D_transport)
3411 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3412 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3413 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3414
3415 if (sx.completed_addr && sx.ok && sx.send_quit)
3416 {
3417 BOOL more;
3418 smtp_compare_t t_compare;
3419
3420 t_compare.tblock = tblock;
3421 t_compare.current_sender_address = sender_address;
3422
3423 if ( sx.first_addr != NULL
3424 || continue_more
3425 || (
3426 #ifdef SUPPORT_TLS
3427 ( tls_out.active < 0 && !continue_proxy_cipher
3428 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3429 )
3430 &&
3431 #endif
3432 transport_check_waiting(tblock->name, host->name,
3433 tblock->connection_max_messages, new_message_id, &more,
3434 (oicf)smtp_are_same_identities, (void*)&t_compare)
3435 ) )
3436 {
3437 uschar *msg;
3438 BOOL pass_message;
3439
3440 if (sx.send_rset)
3441 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3442 {
3443 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3444 host->address, strerror(errno));
3445 sx.send_quit = FALSE;
3446 }
3447 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3448 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3449 {
3450 int code;
3451 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3452 &pass_message);
3453 if (!sx.send_quit)
3454 {
3455 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3456 host->name, host->address, msg);
3457 }
3458 }
3459
3460 /* Either RSET was not needed, or it succeeded */
3461
3462 if (sx.ok)
3463 {
3464 int pfd[2];
3465 int socket_fd = sx.inblock.sock;
3466
3467
3468 if (sx.first_addr != NULL) /* More addresses still to be sent */
3469 { /* in this run of the transport */
3470 continue_sequence++; /* Causes * in logging */
3471 goto SEND_MESSAGE;
3472 }
3473
3474 /* Unless caller said it already has more messages listed for this host,
3475 pass the connection on to a new Exim process (below, the call to
3476 transport_pass_socket). If the caller has more ready, just return with
3477 the connection still open. */
3478
3479 #ifdef SUPPORT_TLS
3480 if (tls_out.active >= 0)
3481 if ( continue_more
3482 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3483 {
3484 /* Before passing the socket on, or returning to caller with it still
3485 open, we must shut down TLS. Not all MTAs allow for the continuation
3486 of the SMTP session when TLS is shut down. We test for this by sending
3487 a new EHLO. If we don't get a good response, we don't attempt to pass
3488 the socket on. */
3489
3490 tls_close(FALSE, TLS_SHUTDOWN_WAIT);
3491 smtp_peer_options = smtp_peer_options_wrap;
3492 sx.ok = !sx.smtps
3493 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3494 "EHLO %s\r\n", sx.helo_data) >= 0
3495 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3496 '2', sx.ob->command_timeout);
3497
3498 if (sx.ok && continue_more)
3499 return yield; /* More addresses for another run */
3500 }
3501 else
3502 {
3503 /* Set up a pipe for proxying TLS for the new transport process */
3504
3505 smtp_peer_options |= OPTION_TLS;
3506 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3507 socket_fd = pfd[1];
3508 else
3509 set_errno(sx.first_addr, errno, US"internal allocation problem",
3510 DEFER, FALSE, host
3511 # ifdef EXPERIMENTAL_DSN_INFO
3512 , sx.smtp_greeting, sx.helo_response
3513 # endif
3514 );
3515 }
3516 else
3517 #endif
3518 if (continue_more)
3519 return yield; /* More addresses for another run */
3520
3521 /* If the socket is successfully passed, we mustn't send QUIT (or
3522 indeed anything!) from here. */
3523
3524 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3525 propagate it from the initial
3526 */
3527 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3528 host->address, new_message_id, socket_fd))
3529 {
3530 sx.send_quit = FALSE;
3531
3532 /* We have passed the client socket to a fresh transport process.
3533 If TLS is still active, we need to proxy it for the transport we
3534 just passed the baton to. Fork a child to to do it, and return to
3535 get logging done asap. Which way to place the work makes assumptions
3536 about post-fork prioritisation which may not hold on all platforms. */
3537 #ifdef SUPPORT_TLS
3538 if (tls_out.active >= 0)
3539 {
3540 int pid = fork();
3541 if (pid == 0) /* child; fork again to disconnect totally */
3542 {
3543 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3544 /* does not return */
3545 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3546 sx.ob->command_timeout);
3547 }
3548
3549 if (pid > 0) /* parent */
3550 {
3551 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3552 close(pfd[0]);
3553 /* tidy the inter-proc to disconn the proxy proc */
3554 waitpid(pid, NULL, 0);
3555 tls_close(FALSE, TLS_NO_SHUTDOWN);
3556 (void)close(sx.inblock.sock);
3557 continue_transport = NULL;
3558 continue_hostname = NULL;
3559 return yield;
3560 }
3561 log_write(0, LOG_PANIC_DIE, "fork failed");
3562 }
3563 #endif
3564 }
3565 }
3566
3567 /* If RSET failed and there are addresses left, they get deferred. */
3568 else
3569 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3570 #ifdef EXPERIMENTAL_DSN_INFO
3571 , sx.smtp_greeting, sx.helo_response
3572 #endif
3573 );
3574 }
3575 }
3576
3577 /* End off tidily with QUIT unless the connection has died or the socket has
3578 been passed to another process. There has been discussion on the net about what
3579 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3580 to wait for a response, but on the other hand, there isn't anything one can do
3581 with an error response, other than log it. Exim used to do that. However,
3582 further discussion suggested that it is positively advantageous not to wait for
3583 the response, but to close the session immediately. This is supposed to move
3584 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3585 load from the server. (Hosts that are both servers and clients may not see much
3586 difference, of course.) Further discussion indicated that this was safe to do
3587 on Unix systems which have decent implementations of TCP/IP that leave the
3588 connection around for a while (TIME_WAIT) after the application has gone away.
3589 This enables the response sent by the server to be properly ACKed rather than
3590 timed out, as can happen on broken TCP/IP implementations on other OS.
3591
3592 This change is being made on 31-Jul-98. After over a year of trouble-free
3593 operation, the old commented-out code was removed on 17-Sep-99. */
3594
3595 SEND_QUIT:
3596 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3597
3598 END_OFF:
3599
3600 #ifdef SUPPORT_TLS
3601 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
3602 #endif
3603
3604 /* Close the socket, and return the appropriate value, first setting
3605 works because the NULL setting is passed back to the calling process, and
3606 remote_max_parallel is forced to 1 when delivering over an existing connection,
3607
3608 If all went well and continue_more is set, we shouldn't actually get here if
3609 there are further addresses, as the return above will be taken. However,
3610 writing RSET might have failed, or there may be other addresses whose hosts are
3611 specified in the transports, and therefore not visible at top level, in which
3612 case continue_more won't get set. */
3613
3614 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3615 if (sx.send_quit)
3616 {
3617 shutdown(sx.outblock.sock, SHUT_WR);
3618 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3619 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3620 rc--; /* drain socket */
3621 }
3622 (void)close(sx.inblock.sock);
3623
3624 #ifndef DISABLE_EVENT
3625 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3626 #endif
3627
3628 continue_transport = NULL;
3629 continue_hostname = NULL;
3630 return yield;
3631 }
3632
3633
3634
3635
3636 /*************************************************
3637 * Closedown entry point *
3638 *************************************************/
3639
3640 /* This function is called when exim is passed an open smtp channel
3641 from another incarnation, but the message which it has been asked
3642 to deliver no longer exists. The channel is on stdin.
3643
3644 We might do fancy things like looking for another message to send down
3645 the channel, but if the one we sought has gone, it has probably been
3646 delivered by some other process that itself will seek further messages,
3647 so just close down our connection.
3648
3649 Argument: pointer to the transport instance block
3650 Returns: nothing
3651 */
3652
3653 void
3654 smtp_transport_closedown(transport_instance *tblock)
3655 {
3656 smtp_transport_options_block *ob =
3657 (smtp_transport_options_block *)tblock->options_block;
3658 smtp_inblock inblock;
3659 smtp_outblock outblock;
3660 uschar buffer[256];
3661 uschar inbuffer[4096];
3662 uschar outbuffer[16];
3663
3664 inblock.sock = fileno(stdin);
3665 inblock.buffer = inbuffer;
3666 inblock.buffersize = sizeof(inbuffer);
3667 inblock.ptr = inbuffer;
3668 inblock.ptrend = inbuffer;
3669
3670 outblock.sock = inblock.sock;
3671 outblock.buffersize = sizeof(outbuffer);
3672 outblock.buffer = outbuffer;
3673 outblock.ptr = outbuffer;
3674 outblock.cmd_count = 0;
3675 outblock.authenticating = FALSE;
3676
3677 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3678 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3679 ob->command_timeout);
3680 (void)close(inblock.sock);
3681 }
3682
3683
3684
3685 /*************************************************
3686 * Prepare addresses for delivery *
3687 *************************************************/
3688
3689 /* This function is called to flush out error settings from previous delivery
3690 attempts to other hosts. It also records whether we got here via an MX record
3691 or not in the more_errno field of the address. We are interested only in
3692 addresses that are still marked DEFER - others may have got delivered to a
3693 previously considered IP address. Set their status to PENDING_DEFER to indicate
3694 which ones are relevant this time.
3695
3696 Arguments:
3697 addrlist the list of addresses
3698 host the host we are delivering to
3699
3700 Returns: the first address for this delivery
3701 */
3702
3703 static address_item *
3704 prepare_addresses(address_item *addrlist, host_item *host)
3705 {
3706 address_item *first_addr = NULL;
3707 address_item *addr;
3708 for (addr = addrlist; addr; addr = addr->next)
3709 if (addr->transport_return == DEFER)
3710 {
3711 if (!first_addr) first_addr = addr;
3712 addr->transport_return = PENDING_DEFER;
3713 addr->basic_errno = 0;
3714 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3715 addr->message = NULL;
3716 #ifdef SUPPORT_TLS
3717 addr->cipher = NULL;
3718 addr->ourcert = NULL;
3719 addr->peercert = NULL;
3720 addr->peerdn = NULL;
3721 addr->ocsp = OCSP_NOT_REQ;
3722 #endif
3723 #ifdef EXPERIMENTAL_DSN_INFO
3724 addr->smtp_greeting = NULL;
3725 addr->helo_response = NULL;
3726 #endif
3727 }
3728 return first_addr;
3729 }
3730
3731
3732
3733 /*************************************************
3734 * Main entry point *
3735 *************************************************/
3736
3737 /* See local README for interface details. As this is a remote transport, it is
3738 given a chain of addresses to be delivered in one connection, if possible. It
3739 always returns TRUE, indicating that each address has its own independent
3740 status set, except if there is a setting up problem, in which case it returns
3741 FALSE. */
3742
3743 BOOL
3744 smtp_transport_entry(
3745 transport_instance *tblock, /* data for this instantiation */
3746 address_item *addrlist) /* addresses we are working on */
3747 {
3748 int cutoff_retry;
3749 int defport;
3750 int hosts_defer = 0;
3751 int hosts_fail = 0;
3752 int hosts_looked_up = 0;
3753 int hosts_retry = 0;
3754 int hosts_serial = 0;
3755 int hosts_total = 0;
3756 int total_hosts_tried = 0;
3757 address_item *addr;
3758 BOOL expired = TRUE;
3759 uschar *expanded_hosts = NULL;
3760 uschar *pistring;
3761 uschar *tid = string_sprintf("%s transport", tblock->name);
3762 smtp_transport_options_block *ob =
3763 (smtp_transport_options_block *)(tblock->options_block);
3764 host_item *hostlist = addrlist->host_list;
3765 host_item *host;
3766
3767 DEBUG(D_transport)
3768 {
3769 debug_printf("%s transport entered\n", tblock->name);
3770 for (addr = addrlist; addr; addr = addr->next)
3771 debug_printf(" %s\n", addr->address);
3772 if (hostlist)
3773 {
3774 debug_printf("hostlist:\n");
3775 for (host = hostlist; host; host = host->next)
3776 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3777 }
3778 if (continue_hostname)
3779 debug_printf("already connected to %s [%s] (on fd %d)\n",
3780 continue_hostname, continue_host_address,
3781 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3782 }
3783
3784 /* Set the flag requesting that these hosts be added to the waiting
3785 database if the delivery fails temporarily or if we are running with
3786 queue_smtp or a 2-stage queue run. This gets unset for certain
3787 kinds of error, typically those that are specific to the message. */
3788
3789 update_waiting = TRUE;
3790
3791 /* If a host list is not defined for the addresses - they must all have the
3792 same one in order to be passed to a single transport - or if the transport has
3793 a host list with hosts_override set, use the host list supplied with the
3794 transport. It is an error for this not to exist. */
3795
3796 if (!hostlist || (ob->hosts_override && ob->hosts))
3797 {
3798 if (!ob->hosts)
3799 {
3800 addrlist->message = string_sprintf("%s transport called with no hosts set",
3801 tblock->name);
3802 addrlist->transport_return = PANIC;
3803 return FALSE; /* Only top address has status */
3804 }
3805
3806 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3807 ob->hosts);
3808
3809 /* If the transport's host list contains no '$' characters, and we are not
3810 randomizing, it is fixed and therefore a chain of hosts can be built once
3811 and for all, and remembered for subsequent use by other calls to this
3812 transport. If, on the other hand, the host list does contain '$', or we are
3813 randomizing its order, we have to rebuild it each time. In the fixed case,
3814 as the hosts string will never be used again, it doesn't matter that we
3815 replace all the : characters with zeros. */
3816
3817 if (!ob->hostlist)
3818 {
3819 uschar *s = ob->hosts;
3820
3821 if (Ustrchr(s, '$') != NULL)
3822 {
3823 if (!(expanded_hosts = expand_string(s)))
3824 {
3825 addrlist->message = string_sprintf("failed to expand list of hosts "
3826 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3827 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3828 return FALSE; /* Only top address has status */
3829 }
3830 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3831 "\"%s\"\n", s, expanded_hosts);
3832 s = expanded_hosts;
3833 }
3834 else
3835 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3836
3837 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3838
3839 /* Check that the expansion yielded something useful. */
3840 if (!hostlist)
3841 {
3842 addrlist->message =
3843 string_sprintf("%s transport has empty hosts setting", tblock->name);
3844 addrlist->transport_return = PANIC;
3845 return FALSE; /* Only top address has status */
3846 }
3847
3848 /* If there was no expansion of hosts, save the host list for
3849 next time. */
3850
3851 if (!expanded_hosts) ob->hostlist = hostlist;
3852 }
3853
3854 /* This is not the first time this transport has been run in this delivery;
3855 the host list was built previously. */
3856
3857 else
3858 hostlist = ob->hostlist;
3859 }
3860
3861 /* The host list was supplied with the address. If hosts_randomize is set, we
3862 must sort it into a random order if it did not come from MX records and has not
3863 already been randomized (but don't bother if continuing down an existing
3864 connection). */
3865
3866 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3867 {
3868 host_item *newlist = NULL;
3869 while (hostlist)
3870 {
3871 host_item *h = hostlist;
3872 hostlist = hostlist->next;
3873
3874 h->sort_key = random_number(100);
3875
3876 if (!newlist)
3877 {
3878 h->next = NULL;
3879 newlist = h;
3880 }
3881 else if (h->sort_key < newlist->sort_key)
3882 {
3883 h->next = newlist;
3884 newlist = h;
3885 }
3886 else
3887 {
3888 host_item *hh = newlist;
3889 while (hh->next)
3890 {
3891 if (h->sort_key < hh->next->sort_key) break;
3892 hh = hh->next;
3893 }
3894 h->next = hh->next;
3895 hh->next = h;
3896 }
3897 }
3898
3899 hostlist = addrlist->host_list = newlist;
3900 }
3901
3902 /* Sort out the default port. */
3903
3904 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3905
3906 /* For each host-plus-IP-address on the list:
3907
3908 . If this is a continued delivery and the host isn't the one with the
3909 current connection, skip.
3910
3911 . If the status is unusable (i.e. previously failed or retry checked), skip.
3912
3913 . If no IP address set, get the address, either by turning the name into
3914 an address, calling gethostbyname if gethostbyname is on, or by calling
3915 the DNS. The DNS may yield multiple addresses, in which case insert the
3916 extra ones into the list.
3917
3918 . Get the retry data if not previously obtained for this address and set the
3919 field which remembers the state of this address. Skip if the retry time is
3920 not reached. If not, remember whether retry data was found. The retry string
3921 contains both the name and the IP address.
3922
3923 . Scan the list of addresses and mark those whose status is DEFER as
3924 PENDING_DEFER. These are the only ones that will be processed in this cycle
3925 of the hosts loop.
3926
3927 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3928 Some addresses may be successfully delivered, others may fail, and yet
3929 others may get temporary errors and so get marked DEFER.
3930
3931 . The return from the delivery attempt is OK if a connection was made and a
3932 valid SMTP dialogue was completed. Otherwise it is DEFER.
3933
3934 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3935
3936 . If fail to connect, or other defer state, add a retry item.
3937
3938 . If there are any addresses whose status is still DEFER, carry on to the
3939 next host/IPaddress, unless we have tried the number of hosts given
3940 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3941 there is some fancy logic for hosts_max_try that means its limit can be
3942 overstepped in some circumstances.
3943
3944 If we get to the end of the list, all hosts have deferred at least one address,
3945 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3946 delivery attempt to those hosts whose last try was before the arrival time of
3947 the current message. To cope with this, we have to go round the loop a second
3948 time. After that, set the status and error data for any addresses that haven't
3949 had it set already. */
3950
3951 for (cutoff_retry = 0;
3952 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3953 cutoff_retry++)
3954 {
3955 host_item *nexthost = NULL;
3956 int unexpired_hosts_tried = 0;
3957 BOOL continue_host_tried = FALSE;
3958
3959 retry_non_continued:
3960 for (host = hostlist;
3961 host
3962 && unexpired_hosts_tried < ob->hosts_max_try
3963 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3964 host = nexthost)
3965 {
3966 int rc;
3967 int host_af;
3968 uschar *rs;
3969 BOOL host_is_expired = FALSE;
3970 BOOL message_defer = FALSE;
3971 BOOL some_deferred = FALSE;
3972 address_item *first_addr = NULL;
3973 uschar *interface = NULL;
3974 uschar *retry_host_key = NULL;
3975 uschar *retry_message_key = NULL;
3976 uschar *serialize_key = NULL;
3977
3978 /* Default next host is next host. :-) But this can vary if the
3979 hosts_max_try limit is hit (see below). It may also be reset if a host
3980 address is looked up here (in case the host was multihomed). */
3981
3982 nexthost = host->next;
3983
3984 /* If the address hasn't yet been obtained from the host name, look it up
3985 now, unless the host is already marked as unusable. If it is marked as
3986 unusable, it means that the router was unable to find its IP address (in
3987 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3988 the lookup failed last time. We don't get this far if *all* MX records
3989 point to non-existent hosts; that is treated as a hard error.
3990
3991 We can just skip this host entirely. When the hosts came from the router,
3992 the address will timeout based on the other host(s); when the address is
3993 looked up below, there is an explicit retry record added.
3994
3995 Note that we mustn't skip unusable hosts if the address is not unset; they
3996 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3997
3998 if (!host->address)
3999 {
4000 int new_port, flags;
4001 host_item *hh;
4002
4003 if (host->status >= hstatus_unusable)
4004 {
4005 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4006 host->name);
4007 continue;
4008 }
4009
4010 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4011
4012 /* The host name is permitted to have an attached port. Find it, and
4013 strip it from the name. Just remember it for now. */
4014
4015 new_port = host_item_get_port(host);
4016
4017 /* Count hosts looked up */
4018
4019 hosts_looked_up++;
4020
4021 /* Find by name if so configured, or if it's an IP address. We don't
4022 just copy the IP address, because we need the test-for-local to happen. */
4023
4024 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4025 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4026 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4027
4028 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4029 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4030 else
4031 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4032 &ob->dnssec, /* domains for request/require */
4033 NULL, NULL);
4034
4035 /* Update the host (and any additional blocks, resulting from
4036 multihoming) with a host-specific port, if any. */
4037
4038 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4039
4040 /* Failure to find the host at this time (usually DNS temporary failure)
4041 is really a kind of routing failure rather than a transport failure.
4042 Therefore we add a retry item of the routing kind, not to stop us trying
4043 to look this name up here again, but to ensure the address gets timed
4044 out if the failures go on long enough. A complete failure at this point
4045 commonly points to a configuration error, but the best action is still
4046 to carry on for the next host. */
4047
4048 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4049 {
4050 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4051 expired = FALSE;
4052 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4053 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4054 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4055 host->status = hstatus_unusable;
4056
4057 for (addr = addrlist; addr; addr = addr->next)
4058 {
4059 if (addr->transport_return != DEFER) continue;
4060 addr->basic_errno = ERRNO_UNKNOWNHOST;
4061 addr->message = string_sprintf(
4062 rc == HOST_FIND_SECURITY
4063 ? "lookup of IP address for %s was insecure"
4064 : "failed to lookup IP address for %s",
4065 host->name);
4066 }
4067 continue;
4068 }
4069
4070 /* If the host is actually the local host, we may have a problem, or
4071 there may be some cunning configuration going on. In the problem case,
4072 log things and give up. The default transport status is already DEFER. */
4073
4074 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4075 {
4076 for (addr = addrlist; addr; addr = addr->next)
4077 {
4078 addr->basic_errno = 0;
4079 addr->message = string_sprintf("%s transport found host %s to be "
4080 "local", tblock->name, host->name);
4081 }
4082 goto END_TRANSPORT;
4083 }
4084 } /* End of block for IP address lookup */
4085
4086 /* If this is a continued delivery, we are interested only in the host
4087 which matches the name of the existing open channel. The check is put
4088 here after the local host lookup, in case the name gets expanded as a
4089 result of the lookup. Set expired FALSE, to save the outer loop executing
4090 twice. */
4091
4092 if (continue_hostname)
4093 if ( Ustrcmp(continue_hostname, host->name) != 0
4094 || Ustrcmp(continue_host_address, host->address) != 0
4095 )
4096 {
4097 expired = FALSE;
4098 continue; /* With next host */
4099 }
4100 else
4101 continue_host_tried = TRUE;
4102
4103 /* Reset the default next host in case a multihomed host whose addresses
4104 are not looked up till just above added to the host list. */
4105
4106 nexthost = host->next;
4107
4108 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4109 domain is in queue_smtp_domains, we don't actually want to attempt any
4110 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4111 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4112 were not in it. We don't want to hold up all SMTP deliveries! Except when
4113 doing a two-stage queue run, don't do this if forcing. */
4114
4115 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4116 match_isinlist(addrlist->domain,
4117 (const uschar **)&queue_smtp_domains, 0,
4118 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4119 {
4120 expired = FALSE;
4121 for (addr = addrlist; addr; addr = addr->next)
4122 if (addr->transport_return == DEFER)
4123 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4124 continue; /* With next host */
4125 }
4126
4127 /* Count hosts being considered - purely for an intelligent comment
4128 if none are usable. */
4129
4130 hosts_total++;
4131
4132 /* Set $host and $host address now in case they are needed for the
4133 interface expansion or the serialize_hosts check; they remain set if an
4134 actual delivery happens. */
4135
4136 deliver_host = host->name;
4137 deliver_host_address = host->address;
4138 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4139 : host->dnssec == DS_NO ? US"no"
4140 : US"";
4141
4142 /* Set up a string for adding to the retry key if the port number is not
4143 the standard SMTP port. A host may have its own port setting that overrides
4144 the default. */
4145
4146 pistring = string_sprintf(":%d", host->port == PORT_NONE
4147 ? defport : host->port);
4148 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4149
4150 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4151 string is set, even if constant (as different transports can have different
4152 constant settings), we must add it to the key that is used for retries,
4153 because connections to the same host from a different interface should be
4154 treated separately. */
4155
4156 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4157 if ((rs = ob->interface) && *rs)
4158 {
4159 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4160 return FALSE;
4161 pistring = string_sprintf("%s/%s", pistring, interface);
4162 }
4163
4164 /* The first time round the outer loop, check the status of the host by
4165 inspecting the retry data. The second time round, we are interested only
4166 in expired hosts that haven't been tried since this message arrived. */
4167
4168 if (cutoff_retry == 0)
4169 {
4170 BOOL incl_ip;
4171 /* Ensure the status of the address is set by checking retry data if
4172 necessary. There may be host-specific retry data (applicable to all
4173 messages) and also data for retries of a specific message at this host.
4174 If either of these retry records are actually read, the keys used are
4175 returned to save recomputing them later. */
4176
4177 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4178 US"retry_include_ip_address", ob->retry_include_ip_address,
4179 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4180 continue; /* with next host */
4181
4182 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4183 incl_ip, &retry_host_key, &retry_message_key);
4184
4185 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4186 (host->address == NULL)? US"" : host->address, pistring,
4187 (host->status == hstatus_usable)? "usable" :
4188 (host->status == hstatus_unusable)? "unusable" :
4189 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4190
4191 /* Skip this address if not usable at this time, noting if it wasn't
4192 actually expired, both locally and in the address. */
4193
4194 switch (host->status)
4195 {
4196 case hstatus_unusable:
4197 expired = FALSE;
4198 setflag(addrlist, af_retry_skipped);
4199 /* Fall through */
4200
4201 case hstatus_unusable_expired:
4202 switch (host->why)
4203 {
4204 case hwhy_retry: hosts_retry++; break;
4205 case hwhy_failed: hosts_fail++; break;
4206 case hwhy_insecure:
4207 case hwhy_deferred: hosts_defer++; break;
4208 }
4209
4210 /* If there was a retry message key, implying that previously there
4211 was a message-specific defer, we don't want to update the list of
4212 messages waiting for these hosts. */
4213
4214 if (retry_message_key) update_waiting = FALSE;
4215 continue; /* With the next host or IP address */
4216 }
4217 }
4218
4219 /* Second time round the loop: if the address is set but expired, and
4220 the message is newer than the last try, let it through. */
4221
4222 else
4223 {
4224 if ( !host->address
4225 || host->status != hstatus_unusable_expired
4226 || host->last_try > received_time.tv_sec)
4227 continue;
4228 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4229 host->name, host->address, pistring);
4230 host_is_expired = TRUE;
4231 }
4232
4233 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4234 it remains TRUE only if all hosts are expired and none are actually tried.
4235 */
4236
4237 expired = FALSE;
4238
4239 /* If this host is listed as one to which access must be serialized,
4240 see if another Exim process has a connection to it, and if so, skip
4241 this host. If not, update the database to record our connection to it
4242 and remember this for later deletion. Do not do any of this if we are
4243 sending the message down a pre-existing connection. */
4244
4245 if ( !continue_hostname
4246 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4247 {
4248 serialize_key = string_sprintf("host-serialize-%s", host->name);
4249 if (!enq_start(serialize_key, 1))
4250 {
4251 DEBUG(D_transport)
4252 debug_printf("skipping host %s because another Exim process "
4253 "is connected to it\n", host->name);
4254 hosts_serial++;
4255 continue;
4256 }
4257 }
4258
4259 /* OK, we have an IP address that is not waiting for its retry time to
4260 arrive (it might be expired) OR (second time round the loop) we have an
4261 expired host that hasn't been tried since the message arrived. Have a go
4262 at delivering the message to it. First prepare the addresses by flushing
4263 out the result of previous attempts, and finding the first address that
4264 is still to be delivered. */
4265
4266 first_addr = prepare_addresses(addrlist, host);
4267
4268 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4269 message_id, host->name, host->address, addrlist->address,
4270 addrlist->next ? ", ..." : "");
4271
4272 set_process_info("delivering %s to %s [%s] (%s%s)",
4273 message_id, host->name, host->address, addrlist->address,
4274 addrlist->next ? ", ..." : "");
4275
4276 /* This is not for real; don't do the delivery. If there are
4277 any remaining hosts, list them. */
4278
4279 if (dont_deliver)
4280 {
4281 host_item *host2;
4282 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4283 for (addr = addrlist; addr; addr = addr->next)
4284 {
4285 addr->host_used = host;
4286 addr->special_action = '*';
4287 addr->message = US"delivery bypassed by -N option";
4288 }
4289 DEBUG(D_transport)
4290 {
4291 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4292 "*** host and remaining hosts:\n", tblock->name);
4293 for (host2 = host; host2; host2 = host2->next)
4294 debug_printf(" %s [%s]\n", host2->name,
4295 host2->address ? host2->address : US"unset");
4296 }
4297 rc = OK;
4298 }
4299
4300 /* This is for real. If the host is expired, we don't count it for
4301 hosts_max_retry. This ensures that all hosts must expire before an address
4302 is timed out, unless hosts_max_try_hardlimit (which protects against
4303 lunatic DNS configurations) is reached.
4304
4305 If the host is not expired and we are about to hit the hosts_max_retry
4306 limit, check to see if there is a subsequent hosts with a different MX
4307 value. If so, make that the next host, and don't count this one. This is a
4308 heuristic to make sure that different MXs do get tried. With a normal kind
4309 of retry rule, they would get tried anyway when the earlier hosts were
4310 delayed, but if the domain has a "retry every time" type of rule - as is
4311 often used for the the very large ISPs, that won't happen. */
4312
4313 else
4314 {
4315 host_item * thost;
4316 /* Make a copy of the host if it is local to this invocation
4317 of the transport. */
4318
4319 if (expanded_hosts)
4320 {
4321 thost = store_get(sizeof(host_item));
4322 *thost = *host;
4323 thost->name = string_copy(host->name);
4324 thost->address = string_copy(host->address);
4325 }
4326 else
4327 thost = host;
4328
4329 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4330 {
4331 host_item *h;
4332 DEBUG(D_transport)
4333 debug_printf("hosts_max_try limit reached with this host\n");
4334 for (h = host; h; h = h->next) if (h->mx != host->mx)
4335 {
4336 nexthost = h;
4337 unexpired_hosts_tried--;
4338 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4339 "and will be tried\n");
4340 break;
4341 }
4342 }
4343
4344 /* Attempt the delivery. */
4345
4346 total_hosts_tried++;
4347 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4348 &message_defer, FALSE);
4349
4350 /* Yield is one of:
4351 OK => connection made, each address contains its result;
4352 message_defer is set for message-specific defers (when all
4353 recipients are marked defer)
4354 DEFER => there was a non-message-specific delivery problem;
4355 ERROR => there was a problem setting up the arguments for a filter,
4356 or there was a problem with expanding added headers
4357 */
4358
4359 /* If the result is not OK, there was a non-message-specific problem.
4360 If the result is DEFER, we need to write to the logs saying what happened
4361 for this particular host, except in the case of authentication and TLS
4362 failures, where the log has already been written. If all hosts defer a
4363 general message is written at the end. */
4364
4365 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4366 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4367 write_logs(host, first_addr->message, first_addr->basic_errno);
4368
4369 #ifndef DISABLE_EVENT
4370 if (rc == DEFER)
4371 deferred_event_raise(first_addr, host);
4372 #endif
4373
4374 /* If STARTTLS was accepted, but there was a failure in setting up the
4375 TLS session (usually a certificate screwup), and the host is not in
4376 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4377 TLS forcibly turned off. We have to start from scratch with a new SMTP
4378 connection. That's why the retry is done from here, not from within
4379 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4380 session, so the in-clear transmission after those errors, if permitted,
4381 happens inside smtp_deliver().] */
4382
4383 #ifdef SUPPORT_TLS
4384 if ( rc == DEFER
4385 && first_addr->basic_errno == ERRNO_TLSFAILURE
4386 && ob->tls_tempfail_tryclear
4387 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4388 )
4389 {
4390 log_write(0, LOG_MAIN,
4391 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4392 first_addr->message, host->name, host->address);
4393 first_addr = prepare_addresses(addrlist, host);
4394 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4395 &message_defer, TRUE);
4396 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4397 write_logs(host, first_addr->message, first_addr->basic_errno);
4398 # ifndef DISABLE_EVENT
4399 if (rc == DEFER)
4400 deferred_event_raise(first_addr, host);
4401 # endif
4402 }
4403 #endif /*SUPPORT_TLS*/
4404 }
4405
4406 /* Delivery attempt finished */
4407
4408 rs = rc == OK ? US"OK"
4409 : rc == DEFER ? US"DEFER"
4410 : rc == ERROR ? US"ERROR"
4411 : US"?";
4412
4413 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4414 message_id, host->name, host->address, addrlist->address,
4415 addrlist->next ? " (& others)" : "", rs);
4416
4417 /* Release serialization if set up */
4418
4419 if (serialize_key) enq_end(serialize_key);
4420
4421 /* If the result is DEFER, or if a host retry record is known to exist, we
4422 need to add an item to the retry chain for updating the retry database
4423 at the end of delivery. We only need to add the item to the top address,
4424 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4425 for any other delivery attempts using the same address. (It is copied into
4426 the unusable tree at the outer level, so even if different address blocks
4427 contain the same address, it still won't get tried again.) */
4428
4429 if (rc == DEFER || retry_host_key)
4430 {
4431 int delete_flag = rc != DEFER ? rf_delete : 0;
4432 if (!retry_host_key)
4433 {
4434 BOOL incl_ip;
4435 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4436 US"retry_include_ip_address", ob->retry_include_ip_address,
4437 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4438 incl_ip = TRUE; /* error; use most-specific retry record */
4439
4440 retry_host_key = incl_ip
4441 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4442 : string_sprintf("T:%S%s", host->name, pistring);
4443 }
4444
4445 /* If a delivery of another message over an existing SMTP connection
4446 yields DEFER, we do NOT set up retry data for the host. This covers the
4447 case when there are delays in routing the addresses in the second message
4448 that are so long that the server times out. This is alleviated by not
4449 routing addresses that previously had routing defers when handling an
4450 existing connection, but even so, this case may occur (e.g. if a
4451 previously happily routed address starts giving routing defers). If the
4452 host is genuinely down, another non-continued message delivery will
4453 notice it soon enough. */
4454
4455 if (delete_flag != 0 || !continue_hostname)
4456 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4457
4458 /* We may have tried an expired host, if its retry time has come; ensure
4459 the status reflects the expiry for the benefit of any other addresses. */
4460
4461 if (rc == DEFER)
4462 {
4463 host->status = host_is_expired
4464 ? hstatus_unusable_expired : hstatus_unusable;
4465 host->why = hwhy_deferred;
4466 }
4467 }
4468
4469 /* If message_defer is set (host was OK, but every recipient got deferred
4470 because of some message-specific problem), or if that had happened
4471 previously so that a message retry key exists, add an appropriate item
4472 to the retry chain. Note that if there was a message defer but now there is
4473 a host defer, the message defer record gets deleted. That seems perfectly
4474 reasonable. Also, stop the message from being remembered as waiting
4475 for specific hosts. */
4476
4477 if (message_defer || retry_message_key)
4478 {
4479 int delete_flag = message_defer ? 0 : rf_delete;
4480 if (!retry_message_key)
4481 {
4482 BOOL incl_ip;
4483 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4484 US"retry_include_ip_address", ob->retry_include_ip_address,
4485 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4486 incl_ip = TRUE; /* error; use most-specific retry record */
4487
4488 retry_message_key = incl_ip
4489 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4490 message_id)
4491 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4492 }
4493 retry_add_item(addrlist, retry_message_key,
4494 rf_message | rf_host | delete_flag);
4495 update_waiting = FALSE;
4496 }
4497
4498 /* Any return other than DEFER (that is, OK or ERROR) means that the
4499 addresses have got their final statuses filled in for this host. In the OK
4500 case, see if any of them are deferred. */
4501
4502 if (rc == OK)
4503 for (addr = addrlist; addr; addr = addr->next)
4504 if (addr->transport_return == DEFER)
4505 {
4506 some_deferred = TRUE;
4507 break;
4508 }
4509
4510 /* If no addresses deferred or the result was ERROR, return. We do this for
4511 ERROR because a failing filter set-up or add_headers expansion is likely to
4512 fail for any host we try. */
4513
4514 if (rc == ERROR || (rc == OK && !some_deferred))
4515 {
4516 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4517 return TRUE; /* Each address has its status */
4518 }
4519
4520 /* If the result was DEFER or some individual addresses deferred, let
4521 the loop run to try other hosts with the deferred addresses, except for the
4522 case when we were trying to deliver down an existing channel and failed.
4523 Don't try any other hosts in this case. */
4524
4525 if (continue_hostname) break;
4526
4527 /* If the whole delivery, or some individual addresses, were deferred and
4528 there are more hosts that could be tried, do not count this host towards
4529 the hosts_max_try limit if the age of the message is greater than the
4530 maximum retry time for this host. This means we may try try all hosts,
4531 ignoring the limit, when messages have been around for some time. This is
4532 important because if we don't try all hosts, the address will never time
4533 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4534
4535 if ((rc == DEFER || some_deferred) && nexthost)
4536 {
4537 BOOL timedout;
4538 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4539
4540 if (retry && retry->rules)
4541 {
4542 retry_rule *last_rule;
4543 for (last_rule = retry->rules;
4544 last_rule->next;
4545 last_rule = last_rule->next);
4546 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4547 }
4548 else timedout = TRUE; /* No rule => timed out */
4549
4550 if (timedout)
4551 {
4552 unexpired_hosts_tried--;
4553 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4554 "hosts_max_try (message older than host's retry time)\n");
4555 }
4556 }
4557 } /* End of loop for trying multiple hosts. */
4558
4559 /* If we failed to find a matching host in the list, for an already-open
4560 connection, just close it and start over with the list. This can happen
4561 for routing that changes from run to run, or big multi-IP sites with
4562 round-robin DNS. */
4563
4564 if (continue_hostname && !continue_host_tried)
4565 {
4566 int fd = cutthrough.fd >= 0 ? cutthrough.fd : 0;
4567
4568 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4569 #ifdef SUPPORT_TLS
4570 if (tls_out.active == fd)
4571 {
4572 (void) tls_write(FALSE, US"QUIT\r\n", 6, FALSE);
4573 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
4574 }
4575 else
4576 #else
4577 (void) write(fd, US"QUIT\r\n", 6);
4578 #endif
4579 (void) close(fd);
4580 cutthrough.fd = -1;
4581 continue_hostname = NULL;
4582 goto retry_non_continued;
4583 }
4584
4585 /* This is the end of the loop that repeats iff expired is TRUE and
4586 ob->delay_after_cutoff is FALSE. The second time round we will
4587 try those hosts that haven't been tried since the message arrived. */
4588
4589 DEBUG(D_transport)
4590 {
4591 debug_printf("all IP addresses skipped or deferred at least one address\n");
4592 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4593 debug_printf("retrying IP addresses not tried since message arrived\n");
4594 }
4595 }
4596
4597
4598 /* Get here if all IP addresses are skipped or defer at least one address. In
4599 MUA wrapper mode, this will happen only for connection or other non-message-
4600 specific failures. Force the delivery status for all addresses to FAIL. */
4601
4602 if (mua_wrapper)
4603 {
4604 for (addr = addrlist; addr; addr = addr->next)
4605 addr->transport_return = FAIL;
4606 goto END_TRANSPORT;
4607 }
4608
4609 /* In the normal, non-wrapper case, add a standard message to each deferred
4610 address if there hasn't been an error, that is, if it hasn't actually been
4611 tried this time. The variable "expired" will be FALSE if any deliveries were
4612 actually tried, or if there was at least one host that was not expired. That
4613 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4614 a delivery has been tried, an error code will be set, and the failing of the
4615 message is handled by the retry code later.
4616
4617 If queue_smtp is set, or this transport was called to send a subsequent message
4618 down an existing TCP/IP connection, and something caused the host not to be
4619 found, we end up here, but can detect these cases and handle them specially. */
4620
4621 for (addr = addrlist; addr; addr = addr->next)
4622 {
4623 /* If host is not NULL, it means that we stopped processing the host list
4624 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4625 means we need to behave as if some hosts were skipped because their retry
4626 time had not come. Specifically, this prevents the address from timing out.
4627 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4628 hosts were tried. */
4629
4630 if (host)
4631 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4632 {
4633 DEBUG(D_transport)
4634 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4635 "hosts were tried\n");
4636 }
4637 else
4638 {
4639 DEBUG(D_transport)
4640 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4641 setflag(addr, af_retry_skipped);
4642 }
4643
4644 if (queue_smtp) /* no deliveries attempted */
4645 {
4646 addr->transport_return = DEFER;
4647 addr->basic_errno = 0;
4648 addr->message = US"SMTP delivery explicitly queued";
4649 }
4650
4651 else if ( addr->transport_return == DEFER
4652 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4653 && !addr->message
4654 )
4655 {
4656 addr->basic_errno = ERRNO_HRETRY;
4657 if (continue_hostname)
4658 addr->message = US"no host found for existing SMTP connection";
4659 else if (expired)
4660 {
4661 setflag(addr, af_pass_message); /* This is not a security risk */
4662 addr->message = string_sprintf(
4663 "all hosts%s have been failing for a long time %s",
4664 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4665 ob->delay_after_cutoff
4666 ? US"(and retry time not reached)"
4667 : US"and were last tried after this message arrived");
4668
4669 /* If we are already using fallback hosts, or there are no fallback hosts
4670 defined, convert the result to FAIL to cause a bounce. */
4671
4672 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4673 addr->transport_return = FAIL;
4674 }
4675 else
4676 {
4677 const char * s;
4678 if (hosts_retry == hosts_total)
4679 s = "retry time not reached for any host%s";
4680 else if (hosts_fail == hosts_total)
4681 s = "all host address lookups%s failed permanently";
4682 else if (hosts_defer == hosts_total)
4683 s = "all host address lookups%s failed temporarily";
4684 else if (hosts_serial == hosts_total)
4685 s = "connection limit reached for all hosts%s";
4686 else if (hosts_fail+hosts_defer == hosts_total)
4687 s = "all host address lookups%s failed";
4688 else
4689 s = "some host address lookups failed and retry time "
4690 "not reached for other hosts or connection limit reached%s";
4691
4692 addr->message = string_sprintf(s,
4693 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4694 }
4695 }
4696 }
4697
4698 /* Update the database which keeps information about which messages are waiting
4699 for which hosts to become available. For some message-specific errors, the
4700 update_waiting flag is turned off because we don't want follow-on deliveries in
4701 those cases. If this transport instance is explicitly limited to one message
4702 per connection then follow-on deliveries are not possible and there's no need
4703 to create/update the per-transport wait-<transport_name> database. */
4704
4705 if (update_waiting && tblock->connection_max_messages != 1)
4706 transport_update_waiting(hostlist, tblock->name);
4707
4708 END_TRANSPORT:
4709
4710 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4711
4712 return TRUE; /* Each address has its status */
4713 }
4714
4715 #endif /*!MACRO_PREDEF*/
4716 /* vi: aw ai sw=2
4717 */
4718 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.