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Fix non-EVENTS build
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
49 #ifndef DISABLE_DKIM
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
68 #endif
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
93 #ifdef SUPPORT_TLS
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
96 #endif
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
101 #ifdef SUPPORT_TLS
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 { "hosts_randomize", opt_bool,
110 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
111 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
112 { "hosts_request_ocsp", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
114 #endif
115 { "hosts_require_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
117 #ifdef SUPPORT_TLS
118 # ifdef SUPPORT_DANE
119 { "hosts_require_dane", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
121 # endif
122 # ifndef DISABLE_OCSP
123 { "hosts_require_ocsp", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
125 # endif
126 { "hosts_require_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
128 #endif
129 { "hosts_try_auth", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
131 { "hosts_try_chunking", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
133 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
134 { "hosts_try_dane", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
136 #endif
137 { "hosts_try_fastopen", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
139 #ifndef DISABLE_PRDR
140 { "hosts_try_prdr", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
142 #endif
143 #ifdef SUPPORT_TLS
144 { "hosts_verify_avoid_tls", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
146 #endif
147 { "interface", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, interface) },
149 { "keepalive", opt_bool,
150 (void *)offsetof(smtp_transport_options_block, keepalive) },
151 { "lmtp_ignore_quota", opt_bool,
152 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
153 { "max_rcpt", opt_int | opt_public,
154 (void *)offsetof(transport_instance, max_addresses) },
155 { "multi_domain", opt_expand_bool | opt_public,
156 (void *)offsetof(transport_instance, multi_domain) },
157 { "port", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, port) },
159 { "protocol", opt_stringptr,
160 (void *)offsetof(smtp_transport_options_block, protocol) },
161 { "retry_include_ip_address", opt_expand_bool,
162 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
163 { "serialize_hosts", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
165 { "size_addition", opt_int,
166 (void *)offsetof(smtp_transport_options_block, size_addition) }
167 #ifdef SUPPORT_SOCKS
168 ,{ "socks_proxy", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
170 #endif
171 #ifdef SUPPORT_TLS
172 ,{ "tls_certificate", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
174 { "tls_crl", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_crl) },
176 { "tls_dh_min_bits", opt_int,
177 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
178 { "tls_privatekey", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
180 { "tls_require_ciphers", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
182 { "tls_sni", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_sni) },
184 { "tls_tempfail_tryclear", opt_bool,
185 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
186 { "tls_try_verify_hosts", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
188 { "tls_verify_cert_hostnames", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
190 { "tls_verify_certificates", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
192 { "tls_verify_hosts", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
194 #endif
195 };
196
197 /* Size of the options list. An extern variable has to be used so that its
198 address can appear in the tables drtables.c. */
199
200 int smtp_transport_options_count =
201 sizeof(smtp_transport_options)/sizeof(optionlist);
202
203
204 #ifdef MACRO_PREDEF
205
206 /* Dummy values */
207 smtp_transport_options_block smtp_transport_option_defaults = {0};
208 void smtp_transport_init(transport_instance *tblock) {}
209 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
210 void smtp_transport_closedown(transport_instance *tblock) {}
211
212 #else /*!MACRO_PREDEF*/
213
214
215 /* Default private options block for the smtp transport. */
216
217 smtp_transport_options_block smtp_transport_option_defaults = {
218 .hosts = NULL,
219 .fallback_hosts = NULL,
220 .hostlist = NULL,
221 .fallback_hostlist = NULL,
222 .helo_data = US"$primary_hostname",
223 .interface = NULL,
224 .port = NULL,
225 .protocol = US"smtp",
226 .dscp = NULL,
227 .serialize_hosts = NULL,
228 .hosts_try_auth = NULL,
229 .hosts_require_auth = NULL,
230 .hosts_try_chunking = US"*",
231 #ifdef SUPPORT_DANE
232 .hosts_try_dane = NULL,
233 .hosts_require_dane = NULL,
234 .dane_require_tls_ciphers = NULL,
235 #endif
236 .hosts_try_fastopen = NULL,
237 #ifndef DISABLE_PRDR
238 .hosts_try_prdr = US"*",
239 #endif
240 #ifndef DISABLE_OCSP
241 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
242 .hosts_require_ocsp = NULL,
243 #endif
244 .hosts_require_tls = NULL,
245 .hosts_avoid_tls = NULL,
246 .hosts_verify_avoid_tls = NULL,
247 .hosts_avoid_pipelining = NULL,
248 .hosts_avoid_esmtp = NULL,
249 #ifdef SUPPORT_TLS
250 .hosts_nopass_tls = NULL,
251 .hosts_noproxy_tls = US"*",
252 #endif
253 .command_timeout = 5*60,
254 .connect_timeout = 5*60,
255 .data_timeout = 5*60,
256 .final_timeout = 10*60,
257 .size_addition = 1024,
258 .hosts_max_try = 5,
259 .hosts_max_try_hardlimit = 50,
260 .address_retry_include_sender = TRUE,
261 .allow_localhost = FALSE,
262 .authenticated_sender_force = FALSE,
263 .gethostbyname = FALSE,
264 .dns_qualify_single = TRUE,
265 .dns_search_parents = FALSE,
266 .dnssec = { .request=NULL, .require=NULL },
267 .delay_after_cutoff = TRUE,
268 .hosts_override = FALSE,
269 .hosts_randomize = FALSE,
270 .keepalive = TRUE,
271 .lmtp_ignore_quota = FALSE,
272 .expand_retry_include_ip_address = NULL,
273 .retry_include_ip_address = TRUE,
274 #ifdef SUPPORT_SOCKS
275 .socks_proxy = NULL,
276 #endif
277 #ifdef SUPPORT_TLS
278 .tls_certificate = NULL,
279 .tls_crl = NULL,
280 .tls_privatekey = NULL,
281 .tls_require_ciphers = NULL,
282 .tls_sni = NULL,
283 .tls_verify_certificates = US"system",
284 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
285 .tls_tempfail_tryclear = TRUE,
286 .tls_verify_hosts = NULL,
287 .tls_try_verify_hosts = US"*",
288 .tls_verify_cert_hostnames = US"*",
289 #endif
290 #ifndef DISABLE_DKIM
291 .dkim =
292 {.dkim_domain = NULL,
293 .dkim_identity = NULL,
294 .dkim_private_key = NULL,
295 .dkim_selector = NULL,
296 .dkim_canon = NULL,
297 .dkim_sign_headers = NULL,
298 .dkim_strict = NULL,
299 .dkim_hash = US"sha256",
300 .dkim_timestamps = NULL,
301 .dot_stuffed = FALSE,
302 .force_bodyhash = FALSE,
303 # ifdef EXPERIMENTAL_ARC
304 .arc_signspec = NULL,
305 # endif
306 },
307 # ifdef EXPERIMENTAL_ARC
308 .arc_sign = NULL,
309 # endif
310 #endif
311 };
312
313 /* some DSN flags for use later */
314
315 static int rf_list[] = {rf_notify_never, rf_notify_success,
316 rf_notify_failure, rf_notify_delay };
317
318 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
319
320
321
322 /* Local statics */
323
324 static uschar *smtp_command; /* Points to last cmd for error messages */
325 static uschar *mail_command; /* Points to MAIL cmd for error messages */
326 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
327 static BOOL update_waiting; /* TRUE to update the "wait" database */
328
329 /*XXX move to smtp_context */
330 static BOOL pipelining_active; /* current transaction is in pipe mode */
331
332
333 /*************************************************
334 * Setup entry point *
335 *************************************************/
336
337 /* This function is called when the transport is about to be used,
338 but before running it in a sub-process. It is used for two things:
339
340 (1) To set the fallback host list in addresses, when delivering.
341 (2) To pass back the interface, port, protocol, and other options, for use
342 during callout verification.
343
344 Arguments:
345 tblock pointer to the transport instance block
346 addrlist list of addresses about to be transported
347 tf if not NULL, pointer to block in which to return options
348 uid the uid that will be set (not used)
349 gid the gid that will be set (not used)
350 errmsg place for error message (not used)
351
352 Returns: OK always (FAIL, DEFER not used)
353 */
354
355 static int
356 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
357 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
358 {
359 smtp_transport_options_block *ob =
360 (smtp_transport_options_block *)(tblock->options_block);
361
362 errmsg = errmsg; /* Keep picky compilers happy */
363 uid = uid;
364 gid = gid;
365
366 /* Pass back options if required. This interface is getting very messy. */
367
368 if (tf)
369 {
370 tf->interface = ob->interface;
371 tf->port = ob->port;
372 tf->protocol = ob->protocol;
373 tf->hosts = ob->hosts;
374 tf->hosts_override = ob->hosts_override;
375 tf->hosts_randomize = ob->hosts_randomize;
376 tf->gethostbyname = ob->gethostbyname;
377 tf->qualify_single = ob->dns_qualify_single;
378 tf->search_parents = ob->dns_search_parents;
379 tf->helo_data = ob->helo_data;
380 }
381
382 /* Set the fallback host list for all the addresses that don't have fallback
383 host lists, provided that the local host wasn't present in the original host
384 list. */
385
386 if (!testflag(addrlist, af_local_host_removed))
387 for (; addrlist; addrlist = addrlist->next)
388 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
389
390 return OK;
391 }
392
393
394
395 /*************************************************
396 * Initialization entry point *
397 *************************************************/
398
399 /* Called for each instance, after its options have been read, to
400 enable consistency checks to be done, or anything else that needs
401 to be set up.
402
403 Argument: pointer to the transport instance block
404 Returns: nothing
405 */
406
407 void
408 smtp_transport_init(transport_instance *tblock)
409 {
410 smtp_transport_options_block *ob =
411 (smtp_transport_options_block *)(tblock->options_block);
412
413 /* Retry_use_local_part defaults FALSE if unset */
414
415 if (tblock->retry_use_local_part == TRUE_UNSET)
416 tblock->retry_use_local_part = FALSE;
417
418 /* Set the default port according to the protocol */
419
420 if (ob->port == NULL)
421 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
422 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
423
424 /* Set up the setup entry point, to be called before subprocesses for this
425 transport. */
426
427 tblock->setup = smtp_transport_setup;
428
429 /* Complain if any of the timeouts are zero. */
430
431 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
432 ob->final_timeout <= 0)
433 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
434 "command, data, or final timeout value is zero for %s transport",
435 tblock->name);
436
437 /* If hosts_override is set and there are local hosts, set the global
438 flag that stops verify from showing router hosts. */
439
440 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
441
442 /* If there are any fallback hosts listed, build a chain of host items
443 for them, but do not do any lookups at this time. */
444
445 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
446 }
447
448
449
450
451
452 /*************************************************
453 * Set delivery info into all active addresses *
454 *************************************************/
455
456 /* Only addresses whose status is >= PENDING are relevant. A lesser
457 status means that an address is not currently being processed.
458
459 Arguments:
460 addrlist points to a chain of addresses
461 errno_value to put in each address's errno field
462 msg to put in each address's message field
463 rc to put in each address's transport_return field
464 pass_message if TRUE, set the "pass message" flag in the address
465 host if set, mark addrs as having used this host
466 smtp_greeting from peer
467 helo_response from peer
468
469 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
470 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
471 this particular type of timeout.
472
473 Returns: nothing
474 */
475
476 static void
477 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
478 BOOL pass_message, host_item * host
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , const uschar * smtp_greeting, const uschar * helo_response
481 #endif
482 )
483 {
484 address_item *addr;
485 int orvalue = 0;
486 if (errno_value == ERRNO_CONNECTTIMEOUT)
487 {
488 errno_value = ETIMEDOUT;
489 orvalue = RTEF_CTOUT;
490 }
491 for (addr = addrlist; addr; addr = addr->next)
492 if (addr->transport_return >= PENDING)
493 {
494 addr->basic_errno = errno_value;
495 addr->more_errno |= orvalue;
496 if (msg)
497 {
498 addr->message = msg;
499 if (pass_message) setflag(addr, af_pass_message);
500 }
501 addr->transport_return = rc;
502 if (host)
503 {
504 addr->host_used = host;
505 #ifdef EXPERIMENTAL_DSN_INFO
506 if (smtp_greeting)
507 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
508 addr->smtp_greeting = smtp_greeting;
509
510 if (helo_response)
511 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
512 addr->helo_response = helo_response;
513 #endif
514 }
515 }
516 }
517
518 static void
519 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
520 BOOL pass_message)
521 {
522 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
523 #ifdef EXPERIMENTAL_DSN_INFO
524 , NULL, NULL
525 #endif
526 );
527 }
528
529
530 /*************************************************
531 * Check an SMTP response *
532 *************************************************/
533
534 /* This function is given an errno code and the SMTP response buffer
535 to analyse, together with the host identification for generating messages. It
536 sets an appropriate message and puts the first digit of the response code into
537 the yield variable. If no response was actually read, a suitable digit is
538 chosen.
539
540 Arguments:
541 host the current host, to get its name for messages
542 errno_value pointer to the errno value
543 more_errno from the top address for use with ERRNO_FILTER_FAIL
544 buffer the SMTP response buffer
545 yield where to put a one-digit SMTP response code
546 message where to put an error message
547 pass_message set TRUE if message is an SMTP response
548
549 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
550 */
551
552 static BOOL
553 check_response(host_item *host, int *errno_value, int more_errno,
554 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
555 {
556 uschar * pl = pipelining_active ? US"pipelined " : US"";
557 const uschar * s;
558
559 *yield = '4'; /* Default setting is to give a temporary error */
560
561 switch(*errno_value)
562 {
563 case ETIMEDOUT: /* Handle response timeout */
564 *message = US string_sprintf("SMTP timeout after %s%s",
565 pl, smtp_command);
566 if (transport_count > 0)
567 *message = US string_sprintf("%s (%d bytes written)", *message,
568 transport_count);
569 return FALSE;
570
571 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
572 s = string_printing(buffer);
573 while (isspace(*s)) s++;
574 *message = *s == 0
575 ? string_sprintf("Malformed SMTP reply (an empty line) "
576 "in response to %s%s", pl, smtp_command)
577 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
578 pl, smtp_command, s);
579 return FALSE;
580
581 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
582 can't send QUIT as we mustn't end the DATA. */
583 *message = string_sprintf("transport filter process failed (%d)%s",
584 more_errno,
585 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
586 return FALSE;
587
588 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
589 can't send QUIT as we mustn't end the DATA. */
590 *message =
591 string_sprintf("failed to expand headers_add or headers_remove: %s",
592 expand_string_message);
593 return FALSE;
594
595 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
596 *message = string_sprintf("failed to write a data block");
597 return FALSE;
598
599 #ifdef SUPPORT_I18N
600 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
601 *message = US"utf8 support required but not offered for forwarding";
602 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
603 return TRUE;
604 #endif
605 }
606
607 /* Handle error responses from the remote mailer. */
608
609 if (buffer[0] != 0)
610 {
611 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
612 "%s", pl, smtp_command, s = string_printing(buffer));
613 *pass_message = TRUE;
614 *yield = buffer[0];
615 return TRUE;
616 }
617
618 /* No data was read. If there is no errno, this must be the EOF (i.e.
619 connection closed) case, which causes deferral. An explicit connection reset
620 error has the same effect. Otherwise, put the host's identity in the message,
621 leaving the errno value to be interpreted as well. In all cases, we have to
622 assume the connection is now dead. */
623
624 if (*errno_value == 0 || *errno_value == ECONNRESET)
625 {
626 *errno_value = ERRNO_SMTPCLOSED;
627 *message = US string_sprintf("Remote host closed connection "
628 "in response to %s%s", pl, smtp_command);
629 }
630 else
631 *message = US string_sprintf("%s [%s]", host->name, host->address);
632
633 return FALSE;
634 }
635
636
637
638 /*************************************************
639 * Write error message to logs *
640 *************************************************/
641
642 /* This writes to the main log and to the message log.
643
644 Arguments:
645 host the current host
646 detail the current message (addr_item->message)
647 basic_errno the errno (addr_item->basic_errno)
648
649 Returns: nothing
650 */
651
652 static void
653 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
654 {
655
656
657 uschar *message = LOGGING(outgoing_port)
658 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
659 host->port == PORT_NONE ? 25 : host->port)
660 : string_sprintf("H=%s [%s]", host->name, host->address);
661
662 if (suffix)
663 {
664 message = string_sprintf("%s: %s", message, suffix);
665 if (basic_errno > 0)
666 message = string_sprintf("%s: %s", message, strerror(basic_errno));
667 }
668 else
669 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
670
671 log_write(0, LOG_MAIN, "%s", message);
672 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
673 }
674
675 static void
676 msglog_line(host_item * host, uschar * message)
677 {
678 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
679 host->name, host->address, message);
680 }
681
682
683
684 #ifndef DISABLE_EVENT
685 /*************************************************
686 * Post-defer action *
687 *************************************************/
688
689 /* This expands an arbitrary per-transport string.
690 It might, for example, be used to write to the database log.
691
692 Arguments:
693 addr the address item containing error information
694 host the current host
695
696 Returns: nothing
697 */
698
699 static void
700 deferred_event_raise(address_item *addr, host_item *host)
701 {
702 uschar * action = addr->transport->event_action;
703 const uschar * save_domain;
704 uschar * save_local;
705
706 if (!action)
707 return;
708
709 save_domain = deliver_domain;
710 save_local = deliver_localpart;
711
712 /*XXX would ip & port already be set up? */
713 deliver_host_address = string_copy(host->address);
714 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
715 event_defer_errno = addr->basic_errno;
716
717 router_name = addr->router->name;
718 transport_name = addr->transport->name;
719 deliver_domain = addr->domain;
720 deliver_localpart = addr->local_part;
721
722 (void) event_raise(action, US"msg:host:defer",
723 addr->message
724 ? addr->basic_errno > 0
725 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
726 : string_copy(addr->message)
727 : addr->basic_errno > 0
728 ? string_copy(US strerror(addr->basic_errno))
729 : NULL);
730
731 deliver_localpart = save_local;
732 deliver_domain = save_domain;
733 router_name = transport_name = NULL;
734 }
735 #endif
736
737 /*************************************************
738 * Synchronize SMTP responses *
739 *************************************************/
740
741 /* This function is called from smtp_deliver() to receive SMTP responses from
742 the server, and match them up with the commands to which they relate. When
743 PIPELINING is not in use, this function is called after every command, and is
744 therefore somewhat over-engineered, but it is simpler to use a single scheme
745 that works both with and without PIPELINING instead of having two separate sets
746 of code.
747
748 The set of commands that are buffered up with pipelining may start with MAIL
749 and may end with DATA; in between are RCPT commands that correspond to the
750 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
751 etc.) are never buffered.
752
753 Errors after MAIL or DATA abort the whole process leaving the response in the
754 buffer. After MAIL, pending responses are flushed, and the original command is
755 re-instated in big_buffer for error messages. For RCPT commands, the remote is
756 permitted to reject some recipient addresses while accepting others. However
757 certain errors clearly abort the whole process. Set the value in
758 transport_return to PENDING_OK if the address is accepted. If there is a
759 subsequent general error, it will get reset accordingly. If not, it will get
760 converted to OK at the end.
761
762 Arguments:
763 sx smtp connection context
764 count the number of responses to read
765 pending_DATA 0 if last command sent was not DATA
766 +1 if previously had a good recipient
767 -1 if not previously had a good recipient
768
769 Returns: 3 if at least one address had 2xx and one had 5xx
770 2 if at least one address had 5xx but none had 2xx
771 1 if at least one host had a 2xx response, but none had 5xx
772 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
773 -1 timeout while reading RCPT response
774 -2 I/O or other non-response error for RCPT
775 -3 DATA or MAIL failed - errno and buffer set
776 */
777
778 static int
779 sync_responses(smtp_context * sx, int count, int pending_DATA)
780 {
781 address_item *addr = sx->sync_addr;
782 smtp_transport_options_block *ob =
783 (smtp_transport_options_block *)sx->tblock->options_block;
784 int yield = 0;
785
786 /* Handle the response for a MAIL command. On error, reinstate the original
787 command in big_buffer for error message use, and flush any further pending
788 responses before returning, except after I/O errors and timeouts. */
789
790 if (sx->pending_MAIL)
791 {
792 count--;
793 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
794 '2', ob->command_timeout))
795 {
796 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
797 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
798 if (errno == 0 && sx->buffer[0] != 0)
799 {
800 uschar flushbuffer[4096];
801 int save_errno = 0;
802 if (sx->buffer[0] == '4')
803 {
804 save_errno = ERRNO_MAIL4XX;
805 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
806 }
807 while (count-- > 0)
808 {
809 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
810 '2', ob->command_timeout)
811 && (errno != 0 || flushbuffer[0] == 0))
812 break;
813 }
814 errno = save_errno;
815 }
816
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
818 while (count-- > 0) /* Mark any pending addrs with the host used */
819 {
820 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
821 addr->host_used = sx->host;
822 addr = addr->next;
823 }
824 return -3;
825 }
826 }
827
828 if (pending_DATA) count--; /* Number of RCPT responses to come */
829
830 /* Read and handle the required number of RCPT responses, matching each one up
831 with an address by scanning for the next address whose status is PENDING_DEFER.
832 */
833
834 while (count-- > 0)
835 {
836 while (addr->transport_return != PENDING_DEFER)
837 if (!(addr = addr->next))
838 return -2;
839
840 /* The address was accepted */
841 addr->host_used = sx->host;
842
843 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
844 '2', ob->command_timeout))
845 {
846 yield |= 1;
847 addr->transport_return = PENDING_OK;
848
849 /* If af_dr_retry_exists is set, there was a routing delay on this address;
850 ensure that any address-specific retry record is expunged. We do this both
851 for the basic key and for the version that also includes the sender. */
852
853 if (testflag(addr, af_dr_retry_exists))
854 {
855 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
856 sender_address);
857 retry_add_item(addr, altkey, rf_delete);
858 retry_add_item(addr, addr->address_retry_key, rf_delete);
859 }
860 }
861
862 /* Timeout while reading the response */
863
864 else if (errno == ETIMEDOUT)
865 {
866 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
867 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
868 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
869 retry_add_item(addr, addr->address_retry_key, 0);
870 update_waiting = FALSE;
871 return -1;
872 }
873
874 /* Handle other errors in obtaining an SMTP response by returning -1. This
875 will cause all the addresses to be deferred. Restore the SMTP command in
876 big_buffer for which we are checking the response, so the error message
877 makes sense. */
878
879 else if (errno != 0 || sx->buffer[0] == 0)
880 {
881 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
882 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
883 return -2;
884 }
885
886 /* Handle SMTP permanent and temporary response codes. */
887
888 else
889 {
890 addr->message =
891 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
892 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
893 string_printing(sx->buffer));
894 setflag(addr, af_pass_message);
895 if (!sx->verify)
896 msglog_line(sx->host, addr->message);
897
898 /* The response was 5xx */
899
900 if (sx->buffer[0] == '5')
901 {
902 addr->transport_return = FAIL;
903 yield |= 2;
904 }
905
906 /* The response was 4xx */
907
908 else
909 {
910 addr->transport_return = DEFER;
911 addr->basic_errno = ERRNO_RCPT4XX;
912 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
913
914 if (!sx->verify)
915 {
916 #ifndef DISABLE_EVENT
917 event_defer_errno = addr->more_errno;
918 msg_event_raise(US"msg:rcpt:host:defer", addr);
919 #endif
920
921 /* Log temporary errors if there are more hosts to be tried.
922 If not, log this last one in the == line. */
923
924 if (sx->host->next)
925 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
926 sx->host->name, sx->host->address, addr->message);
927
928 #ifndef DISABLE_EVENT
929 else
930 msg_event_raise(US"msg:rcpt:defer", addr);
931 #endif
932
933 /* Do not put this message on the list of those waiting for specific
934 hosts, as otherwise it is likely to be tried too often. */
935
936 update_waiting = FALSE;
937
938 /* Add a retry item for the address so that it doesn't get tried again
939 too soon. If address_retry_include_sender is true, add the sender address
940 to the retry key. */
941
942 retry_add_item(addr,
943 ob->address_retry_include_sender
944 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
945 : addr->address_retry_key,
946 0);
947 }
948 }
949 }
950 } /* Loop for next RCPT response */
951
952 /* Update where to start at for the next block of responses, unless we
953 have already handled all the addresses. */
954
955 if (addr) sx->sync_addr = addr->next;
956
957 /* Handle a response to DATA. If we have not had any good recipients, either
958 previously or in this block, the response is ignored. */
959
960 if (pending_DATA != 0 &&
961 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
962 '3', ob->command_timeout))
963 {
964 int code;
965 uschar *msg;
966 BOOL pass_message;
967 if (pending_DATA > 0 || (yield & 1) != 0)
968 {
969 if (errno == 0 && sx->buffer[0] == '4')
970 {
971 errno = ERRNO_DATA4XX;
972 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
973 }
974 return -3;
975 }
976 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
977 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
978 "is in use and there were no good recipients\n", msg);
979 }
980
981 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
982 present) received 3xx. If any RCPTs were handled and yielded anything other
983 than 4xx, yield will be set non-zero. */
984
985 return yield;
986 }
987
988
989
990 /* Do the client side of smtp-level authentication */
991 /*
992 Arguments:
993 buffer EHLO response from server (gets overwritten)
994 addrlist chain of potential addresses to deliver
995 host host to deliver to
996 ob transport options
997 ibp, obp comms channel control blocks
998
999 Returns:
1000 OK Success, or failed (but not required): global "smtp_authenticated" set
1001 DEFER Failed authentication (and was required)
1002 ERROR Internal problem
1003
1004 FAIL_SEND Failed communications - transmit
1005 FAIL - response
1006 */
1007
1008 int
1009 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1010 smtp_transport_options_block *ob, BOOL is_esmtp,
1011 smtp_inblock *ibp, smtp_outblock *obp)
1012 {
1013 int require_auth;
1014 uschar *fail_reason = US"server did not advertise AUTH support";
1015
1016 smtp_authenticated = FALSE;
1017 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1018 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1019
1020 if (is_esmtp && !regex_AUTH) regex_AUTH =
1021 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1022 FALSE, TRUE);
1023
1024 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1025 {
1026 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1027 expand_nmax = -1; /* reset */
1028
1029 /* Must not do this check until after we have saved the result of the
1030 regex match above. */
1031
1032 if (require_auth == OK ||
1033 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1034 {
1035 auth_instance *au;
1036 fail_reason = US"no common mechanisms were found";
1037
1038 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1039
1040 /* Scan the configured authenticators looking for one which is configured
1041 for use as a client, which is not suppressed by client_condition, and
1042 whose name matches an authentication mechanism supported by the server.
1043 If one is found, attempt to authenticate by calling its client function.
1044 */
1045
1046 for (au = auths; !smtp_authenticated && au; au = au->next)
1047 {
1048 uschar *p = names;
1049 if (!au->client ||
1050 (au->client_condition != NULL &&
1051 !expand_check_condition(au->client_condition, au->name,
1052 US"client authenticator")))
1053 {
1054 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1055 au->name,
1056 (au->client)? "client_condition is false" :
1057 "not configured as a client");
1058 continue;
1059 }
1060
1061 /* Loop to scan supported server mechanisms */
1062
1063 while (*p)
1064 {
1065 int rc;
1066 int len = Ustrlen(au->public_name);
1067 while (isspace(*p)) p++;
1068
1069 if (strncmpic(au->public_name, p, len) != 0 ||
1070 (p[len] != 0 && !isspace(p[len])))
1071 {
1072 while (*p != 0 && !isspace(*p)) p++;
1073 continue;
1074 }
1075
1076 /* Found data for a listed mechanism. Call its client entry. Set
1077 a flag in the outblock so that data is overwritten after sending so
1078 that reflections don't show it. */
1079
1080 fail_reason = US"authentication attempt(s) failed";
1081 obp->authenticating = TRUE;
1082 rc = (au->info->clientcode)(au, ibp, obp,
1083 ob->command_timeout, buffer, bufsize);
1084 obp->authenticating = FALSE;
1085 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1086 au->name, rc);
1087
1088 /* A temporary authentication failure must hold up delivery to
1089 this host. After a permanent authentication failure, we carry on
1090 to try other authentication methods. If all fail hard, try to
1091 deliver the message unauthenticated unless require_auth was set. */
1092
1093 switch(rc)
1094 {
1095 case OK:
1096 smtp_authenticated = TRUE; /* stops the outer loop */
1097 client_authenticator = au->name;
1098 if (au->set_client_id != NULL)
1099 client_authenticated_id = expand_string(au->set_client_id);
1100 break;
1101
1102 /* Failure after writing a command */
1103
1104 case FAIL_SEND:
1105 return FAIL_SEND;
1106
1107 /* Failure after reading a response */
1108
1109 case FAIL:
1110 if (errno != 0 || buffer[0] != '5') return FAIL;
1111 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1112 au->name, host->name, host->address, buffer);
1113 break;
1114
1115 /* Failure by some other means. In effect, the authenticator
1116 decided it wasn't prepared to handle this case. Typically this
1117 is the result of "fail" in an expansion string. Do we need to
1118 log anything here? Feb 2006: a message is now put in the buffer
1119 if logging is required. */
1120
1121 case CANCELLED:
1122 if (*buffer != 0)
1123 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1124 "authentication H=%s [%s] %s", au->name, host->name,
1125 host->address, buffer);
1126 break;
1127
1128 /* Internal problem, message in buffer. */
1129
1130 case ERROR:
1131 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1132 DEFER, FALSE);
1133 return ERROR;
1134 }
1135
1136 break; /* If not authenticated, try next authenticator */
1137 } /* Loop for scanning supported server mechanisms */
1138 } /* Loop for further authenticators */
1139 }
1140 }
1141
1142 /* If we haven't authenticated, but are required to, give up. */
1143
1144 if (require_auth == OK && !smtp_authenticated)
1145 {
1146 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1147 string_sprintf("authentication required but %s", fail_reason), DEFER,
1148 FALSE);
1149 return DEFER;
1150 }
1151
1152 return OK;
1153 }
1154
1155
1156 /* Construct AUTH appendix string for MAIL TO */
1157 /*
1158 Arguments
1159 buffer to build string
1160 addrlist chain of potential addresses to deliver
1161 ob transport options
1162
1163 Globals smtp_authenticated
1164 client_authenticated_sender
1165 Return True on error, otherwise buffer has (possibly empty) terminated string
1166 */
1167
1168 BOOL
1169 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1170 smtp_transport_options_block *ob)
1171 {
1172 uschar *local_authenticated_sender = authenticated_sender;
1173
1174 #ifdef notdef
1175 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1176 #endif
1177
1178 if (ob->authenticated_sender != NULL)
1179 {
1180 uschar *new = expand_string(ob->authenticated_sender);
1181 if (new == NULL)
1182 {
1183 if (!expand_string_forcedfail)
1184 {
1185 uschar *message = string_sprintf("failed to expand "
1186 "authenticated_sender: %s", expand_string_message);
1187 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1188 return TRUE;
1189 }
1190 }
1191 else if (new[0] != 0) local_authenticated_sender = new;
1192 }
1193
1194 /* Add the authenticated sender address if present */
1195
1196 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1197 local_authenticated_sender != NULL)
1198 {
1199 string_format(buffer, bufsize, " AUTH=%s",
1200 auth_xtextencode(local_authenticated_sender,
1201 Ustrlen(local_authenticated_sender)));
1202 client_authenticated_sender = string_copy(local_authenticated_sender);
1203 }
1204 else
1205 *buffer= 0;
1206
1207 return FALSE;
1208 }
1209
1210
1211
1212 #ifdef SUPPORT_DANE
1213 /* Lookup TLSA record for host/port.
1214 Return: OK success with dnssec; DANE mode
1215 DEFER Do not use this host now, may retry later
1216 FAIL_FORCED No TLSA record; DANE not usable
1217 FAIL Do not use this connection
1218 */
1219
1220 int
1221 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1222 {
1223 /* move this out to host.c given the similarity to dns_lookup() ? */
1224 uschar buffer[300];
1225 const uschar * fullname = buffer;
1226 int rc;
1227 BOOL sec;
1228
1229 /* TLSA lookup string */
1230 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1231
1232 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1233 sec = dns_is_secure(dnsa);
1234 DEBUG(D_transport)
1235 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1236
1237 switch (rc)
1238 {
1239 case DNS_AGAIN:
1240 return DEFER; /* just defer this TLS'd conn */
1241
1242 case DNS_SUCCEED:
1243 if (sec) return OK;
1244 log_write(0, LOG_MAIN,
1245 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1246 /*FALLTRHOUGH*/
1247
1248 case DNS_NODATA: /* no TLSA RR for this lookup */
1249 case DNS_NOMATCH: /* no records at all for this lookup */
1250 return dane_required ? FAIL : FAIL_FORCED;
1251
1252 default:
1253 case DNS_FAIL:
1254 return dane_required ? FAIL : DEFER;
1255 }
1256 }
1257 #endif
1258
1259
1260
1261 typedef struct smtp_compare_s
1262 {
1263 uschar *current_sender_address;
1264 struct transport_instance *tblock;
1265 } smtp_compare_t;
1266
1267
1268 /* Create a unique string that identifies this message, it is based on
1269 sender_address, helo_data and tls_certificate if enabled.
1270 */
1271
1272 static uschar *
1273 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1274 {
1275 address_item * addr1;
1276 uschar * if1 = US"";
1277 uschar * helo1 = US"";
1278 #ifdef SUPPORT_TLS
1279 uschar * tlsc1 = US"";
1280 #endif
1281 uschar * save_sender_address = sender_address;
1282 uschar * local_identity = NULL;
1283 smtp_transport_options_block * ob =
1284 (smtp_transport_options_block *)tblock->options_block;
1285
1286 sender_address = sender;
1287
1288 addr1 = deliver_make_addr (sender, TRUE);
1289 deliver_set_expansions(addr1);
1290
1291 if (ob->interface)
1292 if1 = expand_string(ob->interface);
1293
1294 if (ob->helo_data)
1295 helo1 = expand_string(ob->helo_data);
1296
1297 #ifdef SUPPORT_TLS
1298 if (ob->tls_certificate)
1299 tlsc1 = expand_string(ob->tls_certificate);
1300 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1301 #else
1302 local_identity = string_sprintf ("%s^%s", if1, helo1);
1303 #endif
1304
1305 deliver_set_expansions(NULL);
1306 sender_address = save_sender_address;
1307
1308 return local_identity;
1309 }
1310
1311
1312
1313 /* This routine is a callback that is called from transport_check_waiting.
1314 This function will evaluate the incoming message versus the previous
1315 message. If the incoming message is using a different local identity then
1316 we will veto this new message. */
1317
1318 static BOOL
1319 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1320 {
1321 uschar * message_local_identity,
1322 * current_local_identity,
1323 * new_sender_address;
1324
1325 current_local_identity =
1326 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1327
1328 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1329 return 0;
1330
1331 message_local_identity =
1332 smtp_local_identity(new_sender_address, s_compare->tblock);
1333
1334 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1335 }
1336
1337
1338
1339 static uschar
1340 ehlo_response(uschar * buf, uschar checks)
1341 {
1342 size_t bsize = Ustrlen(buf);
1343
1344 #ifdef SUPPORT_TLS
1345 if ( checks & OPTION_TLS
1346 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~OPTION_TLS;
1348 #endif
1349
1350 if ( checks & OPTION_IGNQ
1351 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1352 PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_IGNQ;
1354
1355 if ( checks & OPTION_CHUNKING
1356 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~OPTION_CHUNKING;
1358
1359 #ifndef DISABLE_PRDR
1360 if ( checks & OPTION_PRDR
1361 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_PRDR;
1363 #endif
1364
1365 #ifdef SUPPORT_I18N
1366 if ( checks & OPTION_UTF8
1367 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1368 checks &= ~OPTION_UTF8;
1369 #endif
1370
1371 if ( checks & OPTION_DSN
1372 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1373 checks &= ~OPTION_DSN;
1374
1375 if ( checks & OPTION_PIPE
1376 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1377 PCRE_EOPT, NULL, 0) < 0)
1378 checks &= ~OPTION_PIPE;
1379
1380 if ( checks & OPTION_SIZE
1381 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1382 checks &= ~OPTION_SIZE;
1383
1384 return checks;
1385 }
1386
1387
1388
1389 /* Callback for emitting a BDAT data chunk header.
1390
1391 If given a nonzero size, first flush any buffered SMTP commands
1392 then emit the command.
1393
1394 Reap previous SMTP command responses if requested, and always reap
1395 the response from a previous BDAT command.
1396
1397 Args:
1398 tctx transport context
1399 chunk_size value for SMTP BDAT command
1400 flags
1401 tc_chunk_last add LAST option to SMTP BDAT command
1402 tc_reap_prev reap response to previous SMTP commands
1403
1404 Returns: OK or ERROR
1405 */
1406
1407 static int
1408 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1409 unsigned flags)
1410 {
1411 smtp_transport_options_block * ob =
1412 (smtp_transport_options_block *)(tctx->tblock->options_block);
1413 smtp_context * sx = tctx->smtp_context;
1414 int cmd_count = 0;
1415 int prev_cmd_count;
1416
1417 /* Write SMTP chunk header command. If not reaping responses, note that
1418 there may be more writes (like, the chunk data) done soon. */
1419
1420 if (chunk_size > 0)
1421 {
1422 if((cmd_count = smtp_write_command(&sx->outblock,
1423 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1424 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1425 ) < 0) return ERROR;
1426 if (flags & tc_chunk_last)
1427 data_command = string_copy(big_buffer); /* Save for later error message */
1428 }
1429
1430 prev_cmd_count = cmd_count += sx->cmd_count;
1431
1432 /* Reap responses for any previous, but not one we just emitted */
1433
1434 if (chunk_size > 0)
1435 prev_cmd_count--;
1436 if (sx->pending_BDAT)
1437 prev_cmd_count--;
1438
1439 if (flags & tc_reap_prev && prev_cmd_count > 0)
1440 {
1441 DEBUG(D_transport) debug_printf("look for %d responses"
1442 " for previous pipelined cmds\n", prev_cmd_count);
1443
1444 switch(sync_responses(sx, prev_cmd_count, 0))
1445 {
1446 case 1: /* 2xx (only) => OK */
1447 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1448 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1449 case 0: break; /* No 2xx or 5xx, but no probs */
1450
1451 case -1: /* Timeout on RCPT */
1452 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1453 }
1454 cmd_count = 1;
1455 if (!sx->pending_BDAT)
1456 pipelining_active = FALSE;
1457 }
1458
1459 /* Reap response for an outstanding BDAT */
1460
1461 if (sx->pending_BDAT)
1462 {
1463 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1464
1465 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1466 ob->command_timeout))
1467 {
1468 if (errno == 0 && sx->buffer[0] == '4')
1469 {
1470 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1471 sx->addrlist->more_errno |=
1472 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1473 }
1474 return ERROR;
1475 }
1476 cmd_count--;
1477 sx->pending_BDAT = FALSE;
1478 pipelining_active = FALSE;
1479 }
1480 else if (chunk_size > 0)
1481 sx->pending_BDAT = TRUE;
1482
1483
1484 sx->cmd_count = cmd_count;
1485 return OK;
1486 }
1487
1488
1489
1490 /*************************************************
1491 * Make connection for given message *
1492 *************************************************/
1493
1494 /*
1495 Arguments:
1496 ctx connection context
1497 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1498 a second attempt after TLS initialization fails
1499
1500 Returns: OK - the connection was made and the delivery attempted;
1501 fd is set in the conn context, tls_out set up.
1502 DEFER - the connection could not be made, or something failed
1503 while setting up the SMTP session, or there was a
1504 non-message-specific error, such as a timeout.
1505 ERROR - helo_data or add_headers or authenticated_sender is
1506 specified for this transport, and the string failed
1507 to expand
1508 */
1509 int
1510 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1511 {
1512 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1513 dns_answer tlsa_dnsa;
1514 #endif
1515 BOOL pass_message = FALSE;
1516 uschar * message = NULL;
1517 int yield = OK;
1518 int rc;
1519
1520 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1521
1522 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1523 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1524 sx->ok = FALSE;
1525 sx->send_rset = TRUE;
1526 sx->send_quit = TRUE;
1527 sx->setting_up = TRUE;
1528 sx->esmtp = TRUE;
1529 sx->esmtp_sent = FALSE;
1530 #ifdef SUPPORT_I18N
1531 sx->utf8_needed = FALSE;
1532 #endif
1533 sx->dsn_all_lasthop = TRUE;
1534 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1535 sx->dane = FALSE;
1536 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1537 #endif
1538
1539 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1540 sx->peer_offered = 0;
1541 sx->avoid_option = 0;
1542 sx->igquotstr = US"";
1543 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1544 #ifdef EXPERIMENTAL_DSN_INFO
1545 sx->smtp_greeting = NULL;
1546 sx->helo_response = NULL;
1547 #endif
1548
1549 smtp_command = US"initial connection";
1550 sx->buffer[0] = '\0';
1551
1552 /* Set up the buffer for reading SMTP response packets. */
1553
1554 sx->inblock.buffer = sx->inbuffer;
1555 sx->inblock.buffersize = sizeof(sx->inbuffer);
1556 sx->inblock.ptr = sx->inbuffer;
1557 sx->inblock.ptrend = sx->inbuffer;
1558
1559 /* Set up the buffer for holding SMTP commands while pipelining */
1560
1561 sx->outblock.buffer = sx->outbuffer;
1562 sx->outblock.buffersize = sizeof(sx->outbuffer);
1563 sx->outblock.ptr = sx->outbuffer;
1564 sx->outblock.cmd_count = 0;
1565 sx->outblock.authenticating = FALSE;
1566
1567 /* Reset the parameters of a TLS session. */
1568
1569 tls_out.bits = 0;
1570 tls_out.cipher = NULL; /* the one we may use for this transport */
1571 tls_out.ourcert = NULL;
1572 tls_out.peercert = NULL;
1573 tls_out.peerdn = NULL;
1574 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1575 tls_out.sni = NULL;
1576 #endif
1577 tls_out.ocsp = OCSP_NOT_REQ;
1578
1579 /* Flip the legacy TLS-related variables over to the outbound set in case
1580 they're used in the context of the transport. Don't bother resetting
1581 afterward (when being used by a transport) as we're in a subprocess.
1582 For verify, unflipped once the callout is dealt with */
1583
1584 tls_modify_variables(&tls_out);
1585
1586 #ifndef SUPPORT_TLS
1587 if (sx->smtps)
1588 {
1589 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1590 DEFER, FALSE);
1591 return ERROR;
1592 }
1593 #endif
1594
1595 /* Make a connection to the host if this isn't a continued delivery, and handle
1596 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1597 specially so they can be identified for retries. */
1598
1599 if (!continue_hostname)
1600 {
1601 if (sx->verify)
1602 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1603
1604 /* Get the actual port the connection will use, into sx->host */
1605
1606 smtp_port_for_connect(sx->host, sx->port);
1607
1608 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1609 /* Do TLSA lookup for DANE */
1610 {
1611 tls_out.dane_verified = FALSE;
1612 tls_out.tlsa_usage = 0;
1613
1614 if (sx->host->dnssec == DS_YES)
1615 {
1616 if( sx->dane_required
1617 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1618 )
1619 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1620 {
1621 case OK: sx->dane = TRUE;
1622 sx->ob->tls_tempfail_tryclear = FALSE;
1623 break;
1624 case FAIL_FORCED: break;
1625 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1626 string_sprintf("DANE error: tlsa lookup %s",
1627 rc == DEFER ? "DEFER" : "FAIL"),
1628 rc, FALSE);
1629 # ifndef DISABLE_EVENT
1630 (void) event_raise(sx->tblock->event_action,
1631 US"dane:fail", sx->dane_required
1632 ? US"dane-required" : US"dnssec-invalid");
1633 # endif
1634 return rc;
1635 }
1636 }
1637 else if (sx->dane_required)
1638 {
1639 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1640 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1641 FAIL, FALSE);
1642 # ifndef DISABLE_EVENT
1643 (void) event_raise(sx->tblock->event_action,
1644 US"dane:fail", US"dane-required");
1645 # endif
1646 return FAIL;
1647 }
1648 }
1649 #endif /*DANE*/
1650
1651 /* Make the TCP connection */
1652
1653 sx->cctx.sock =
1654 smtp_connect(sx->host, sx->host_af, sx->interface,
1655 sx->ob->connect_timeout, sx->tblock);
1656 sx->cctx.tls_ctx = NULL;
1657 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1658
1659 if (sx->cctx.sock < 0)
1660 {
1661 uschar * msg = NULL;
1662 if (sx->verify)
1663 {
1664 msg = US strerror(errno);
1665 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1666 }
1667 set_errno_nohost(sx->addrlist,
1668 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1669 sx->verify ? string_sprintf("could not connect: %s", msg)
1670 : NULL,
1671 DEFER, FALSE);
1672 sx->send_quit = FALSE;
1673 return DEFER;
1674 }
1675
1676 /* Expand the greeting message while waiting for the initial response. (Makes
1677 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1678 delayed till here so that $sending_interface and $sending_port are set. */
1679
1680 if (sx->helo_data)
1681 if (!(sx->helo_data = expand_string(sx->helo_data)))
1682 if (sx->verify)
1683 log_write(0, LOG_MAIN|LOG_PANIC,
1684 "<%s>: failed to expand transport's helo_data value for callout: %s",
1685 sx->addrlist->address, expand_string_message);
1686
1687 #ifdef SUPPORT_I18N
1688 if (sx->helo_data)
1689 {
1690 expand_string_message = NULL;
1691 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1692 &expand_string_message)),
1693 expand_string_message)
1694 if (sx->verify)
1695 log_write(0, LOG_MAIN|LOG_PANIC,
1696 "<%s>: failed to expand transport's helo_data value for callout: %s",
1697 sx->addrlist->address, expand_string_message);
1698 else
1699 sx->helo_data = NULL;
1700 }
1701 #endif
1702
1703 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1704 is nevertheless a reasonably clean way of programming this kind of logic,
1705 where you want to escape on any error. */
1706
1707 if (!sx->smtps)
1708 {
1709 BOOL good_response;
1710
1711 #ifdef TCP_QUICKACK
1712 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1713 #endif
1714 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1715 '2', sx->ob->command_timeout);
1716 #ifdef EXPERIMENTAL_DSN_INFO
1717 sx->smtp_greeting = string_copy(sx->buffer);
1718 #endif
1719 if (!good_response) goto RESPONSE_FAILED;
1720
1721 #ifndef DISABLE_EVENT
1722 {
1723 uschar * s;
1724 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1725 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1726 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1727 if (s)
1728 {
1729 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1730 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1731 DEFER, FALSE);
1732 yield = DEFER;
1733 goto SEND_QUIT;
1734 }
1735 }
1736 #endif
1737
1738 /* Now check if the helo_data expansion went well, and sign off cleanly if
1739 it didn't. */
1740
1741 if (!sx->helo_data)
1742 {
1743 message = string_sprintf("failed to expand helo_data: %s",
1744 expand_string_message);
1745 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1746 yield = DEFER;
1747 goto SEND_QUIT;
1748 }
1749 }
1750
1751 /** Debugging without sending a message
1752 sx->addrlist->transport_return = DEFER;
1753 goto SEND_QUIT;
1754 **/
1755
1756 /* Errors that occur after this point follow an SMTP command, which is
1757 left in big_buffer by smtp_write_command() for use in error messages. */
1758
1759 smtp_command = big_buffer;
1760
1761 /* Tell the remote who we are...
1762
1763 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1764 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1765 greeting is of this form. The assumption was that the far end supports it
1766 properly... but experience shows that there are some that give 5xx responses,
1767 even though the banner includes "ESMTP" (there's a bloody-minded one that
1768 says "ESMTP not spoken here"). Cope with that case.
1769
1770 September 2000: Time has passed, and it seems reasonable now to always send
1771 EHLO at the start. It is also convenient to make the change while installing
1772 the TLS stuff.
1773
1774 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1775 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1776 would be no way to send out the mails, so there is now a host list
1777 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1778 PIPELINING problem as well. Maybe it can also be useful to cure other
1779 problems with broken servers.
1780
1781 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1782 Then somebody tried it with a Microsoft mailer... It seems that all other
1783 mailers use upper case for some reason (the RFC is quite clear about case
1784 independence) so, for peace of mind, I gave in. */
1785
1786 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1787
1788 /* Alas; be careful, since this goto is not an error-out, so conceivably
1789 we might set data between here and the target which we assume to exist
1790 and be usable. I can see this coming back to bite us. */
1791 #ifdef SUPPORT_TLS
1792 if (sx->smtps)
1793 {
1794 smtp_peer_options |= OPTION_TLS;
1795 suppress_tls = FALSE;
1796 sx->ob->tls_tempfail_tryclear = FALSE;
1797 smtp_command = US"SSL-on-connect";
1798 goto TLS_NEGOTIATE;
1799 }
1800 #endif
1801
1802 if (sx->esmtp)
1803 {
1804 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1805 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1806 goto SEND_FAILED;
1807 sx->esmtp_sent = TRUE;
1808 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1809 sx->ob->command_timeout))
1810 {
1811 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1812 {
1813 #ifdef EXPERIMENTAL_DSN_INFO
1814 sx->helo_response = string_copy(sx->buffer);
1815 #endif
1816 goto RESPONSE_FAILED;
1817 }
1818 sx->esmtp = FALSE;
1819 }
1820 #ifdef EXPERIMENTAL_DSN_INFO
1821 sx->helo_response = string_copy(sx->buffer);
1822 #endif
1823 }
1824 else
1825 DEBUG(D_transport)
1826 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1827
1828 if (!sx->esmtp)
1829 {
1830 BOOL good_response;
1831 int n = sizeof(sx->buffer);
1832 uschar * rsp = sx->buffer;
1833
1834 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1835 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1836
1837 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1838 goto SEND_FAILED;
1839 good_response = smtp_read_response(&sx->inblock, rsp, n,
1840 '2', sx->ob->command_timeout);
1841 #ifdef EXPERIMENTAL_DSN_INFO
1842 sx->helo_response = string_copy(rsp);
1843 #endif
1844 if (!good_response)
1845 {
1846 /* Handle special logging for a closed connection after HELO
1847 when had previously sent EHLO */
1848
1849 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1850 {
1851 errno = ERRNO_SMTPCLOSED;
1852 goto EHLOHELO_FAILED;
1853 }
1854 memmove(sx->buffer, rsp, Ustrlen(rsp));
1855 goto RESPONSE_FAILED;
1856 }
1857 }
1858
1859 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1860
1861 if (sx->esmtp || sx->lmtp)
1862 {
1863 sx->peer_offered = ehlo_response(sx->buffer,
1864 OPTION_TLS /* others checked later */
1865 );
1866
1867 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1868
1869 #ifdef SUPPORT_TLS
1870 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1871 #endif
1872 }
1873 }
1874
1875 /* For continuing deliveries down the same channel, having re-exec'd the socket
1876 is the standard input; for a socket held open from verify it is recorded
1877 in the cutthrough context block. Either way we don't need to redo EHLO here
1878 (but may need to do so for TLS - see below).
1879 Set up the pointer to where subsequent commands will be left, for
1880 error messages. Note that smtp_peer_options will have been
1881 set from the command line if they were set in the process that passed the
1882 connection on. */
1883
1884 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1885 as the continue goes via transport_pass_socket() and doublefork and exec.
1886 It does not wait. Unclear how we keep separate host's responses
1887 separate - we could match up by host ip+port as a bodge. */
1888
1889 else
1890 {
1891 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
1892 {
1893 sx->cctx = cutthrough.cctx;
1894 sx->host->port = sx->port = cutthrough.host.port;
1895 }
1896 else
1897 {
1898 sx->cctx.sock = 0; /* stdin */
1899 sx->cctx.tls_ctx = NULL;
1900 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1901 }
1902 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1903 smtp_command = big_buffer;
1904 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1905
1906 /* For a continued connection with TLS being proxied for us, or a
1907 held-open verify connection with TLS, nothing more to do. */
1908
1909 if ( continue_proxy_cipher
1910 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
1911 && cutthrough.is_tls)
1912 )
1913 {
1914 sx->peer_offered = smtp_peer_options;
1915 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1916 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1917 continue_proxy_cipher ? "proxied" : "verify conn with");
1918 return OK;
1919 }
1920 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1921 }
1922
1923 /* If TLS is available on this connection, whether continued or not, attempt to
1924 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1925 send another EHLO - the server may give a different answer in secure mode. We
1926 use a separate buffer for reading the response to STARTTLS so that if it is
1927 negative, the original EHLO data is available for subsequent analysis, should
1928 the client not be required to use TLS. If the response is bad, copy the buffer
1929 for error analysis. */
1930
1931 #ifdef SUPPORT_TLS
1932 if ( smtp_peer_options & OPTION_TLS
1933 && !suppress_tls
1934 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1935 && ( !sx->verify
1936 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1937 ) )
1938 {
1939 uschar buffer2[4096];
1940 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1941 goto SEND_FAILED;
1942
1943 /* If there is an I/O error, transmission of this message is deferred. If
1944 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1945 false, we also defer. However, if there is a temporary rejection of STARTTLS
1946 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1947 STARTTLS, we carry on. This means we will try to send the message in clear,
1948 unless the host is in hosts_require_tls (tested below). */
1949
1950 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1951 sx->ob->command_timeout))
1952 {
1953 if ( errno != 0
1954 || buffer2[0] == 0
1955 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1956 )
1957 {
1958 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1959 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1960 goto RESPONSE_FAILED;
1961 }
1962 }
1963
1964 /* STARTTLS accepted: try to negotiate a TLS session. */
1965
1966 else
1967 TLS_NEGOTIATE:
1968 {
1969 address_item * addr;
1970 uschar * errstr;
1971 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->host,
1972 sx->addrlist, sx->tblock,
1973 # ifdef SUPPORT_DANE
1974 sx->dane ? &tlsa_dnsa : NULL,
1975 # endif
1976 &tls_out, &errstr);
1977
1978 if (!sx->cctx.tls_ctx)
1979 {
1980 /* TLS negotiation failed; give an error. From outside, this function may
1981 be called again to try in clear on a new connection, if the options permit
1982 it for this host. */
1983
1984 # ifdef SUPPORT_DANE
1985 if (sx->dane)
1986 {
1987 log_write(0, LOG_MAIN,
1988 "DANE attempt failed; TLS connection to %s [%s]: %s",
1989 sx->host->name, sx->host->address, errstr);
1990 # ifndef DISABLE_EVENT
1991 (void) event_raise(sx->tblock->event_action,
1992 US"dane:fail", US"validation-failure"); /* could do with better detail */
1993 # endif
1994 }
1995 # endif
1996
1997 errno = ERRNO_TLSFAILURE;
1998 message = string_sprintf("TLS session: %s", errstr);
1999 sx->send_quit = FALSE;
2000 goto TLS_FAILED;
2001 }
2002
2003 /* TLS session is set up */
2004
2005 smtp_peer_options_wrap = smtp_peer_options;
2006 for (addr = sx->addrlist; addr; addr = addr->next)
2007 if (addr->transport_return == PENDING_DEFER)
2008 {
2009 addr->cipher = tls_out.cipher;
2010 addr->ourcert = tls_out.ourcert;
2011 addr->peercert = tls_out.peercert;
2012 addr->peerdn = tls_out.peerdn;
2013 addr->ocsp = tls_out.ocsp;
2014 }
2015 }
2016 }
2017
2018 /* if smtps, we'll have smtp_command set to something else; always safe to
2019 reset it here. */
2020 smtp_command = big_buffer;
2021
2022 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2023 helo_data is null, we are dealing with a connection that was passed from
2024 another process, and so we won't have expanded helo_data above. We have to
2025 expand it here. $sending_ip_address and $sending_port are set up right at the
2026 start of the Exim process (in exim.c). */
2027
2028 if (tls_out.active.sock >= 0)
2029 {
2030 char *greeting_cmd;
2031 BOOL good_response;
2032
2033 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2034 {
2035 uschar *message = string_sprintf("failed to expand helo_data: %s",
2036 expand_string_message);
2037 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2038 yield = DEFER;
2039 goto SEND_QUIT;
2040 }
2041
2042 /* For SMTPS we need to wait for the initial OK response. */
2043 if (sx->smtps)
2044 {
2045 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2046 '2', sx->ob->command_timeout);
2047 #ifdef EXPERIMENTAL_DSN_INFO
2048 sx->smtp_greeting = string_copy(sx->buffer);
2049 #endif
2050 if (!good_response) goto RESPONSE_FAILED;
2051 }
2052
2053 if (sx->esmtp)
2054 greeting_cmd = "EHLO";
2055 else
2056 {
2057 greeting_cmd = "HELO";
2058 DEBUG(D_transport)
2059 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2060 }
2061
2062 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2063 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2064 goto SEND_FAILED;
2065 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2066 '2', sx->ob->command_timeout);
2067 #ifdef EXPERIMENTAL_DSN_INFO
2068 sx->helo_response = string_copy(sx->buffer);
2069 #endif
2070 if (!good_response) goto RESPONSE_FAILED;
2071 smtp_peer_options = 0;
2072 }
2073
2074 /* If the host is required to use a secure channel, ensure that we
2075 have one. */
2076
2077 else if ( sx->smtps
2078 # ifdef SUPPORT_DANE
2079 || sx->dane
2080 # endif
2081 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2082 )
2083 {
2084 errno = ERRNO_TLSREQUIRED;
2085 message = string_sprintf("a TLS session is required, but %s",
2086 smtp_peer_options & OPTION_TLS
2087 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2088 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2089 if (sx->dane)
2090 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2091 smtp_peer_options & OPTION_TLS
2092 ? US"validation-failure" /* could do with better detail */
2093 : US"starttls-not-supported");
2094 # endif
2095 goto TLS_FAILED;
2096 }
2097 #endif /*SUPPORT_TLS*/
2098
2099 /* If TLS is active, we have just started it up and re-done the EHLO command,
2100 so its response needs to be analyzed. If TLS is not active and this is a
2101 continued session down a previously-used socket, we haven't just done EHLO, so
2102 we skip this. */
2103
2104 if (continue_hostname == NULL
2105 #ifdef SUPPORT_TLS
2106 || tls_out.active.sock >= 0
2107 #endif
2108 )
2109 {
2110 if (sx->esmtp || sx->lmtp)
2111 {
2112 sx->peer_offered = ehlo_response(sx->buffer,
2113 0 /* no TLS */
2114 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2115 | OPTION_CHUNKING
2116 | OPTION_PRDR
2117 #ifdef SUPPORT_I18N
2118 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2119 /*XXX if we hand peercaps on to continued-conn processes,
2120 must not depend on this addr */
2121 #endif
2122 | OPTION_DSN
2123 | OPTION_PIPE
2124 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2125 );
2126
2127 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2128 lmtp_ignore_quota option was set. */
2129
2130 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2131
2132 /* If the response to EHLO specified support for the SIZE parameter, note
2133 this, provided size_addition is non-negative. */
2134
2135 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2136
2137 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2138 the current host, esmtp will be false, so PIPELINING can never be used. If
2139 the current host matches hosts_avoid_pipelining, don't do it. */
2140
2141 if ( sx->peer_offered & OPTION_PIPE
2142 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2143 smtp_peer_options |= OPTION_PIPE;
2144
2145 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2146 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2147
2148 if ( sx->peer_offered & OPTION_CHUNKING
2149 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2150 sx->peer_offered &= ~OPTION_CHUNKING;
2151
2152 if (sx->peer_offered & OPTION_CHUNKING)
2153 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2154
2155 #ifndef DISABLE_PRDR
2156 if ( sx->peer_offered & OPTION_PRDR
2157 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2158 sx->peer_offered &= ~OPTION_PRDR;
2159
2160 if (sx->peer_offered & OPTION_PRDR)
2161 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2162 #endif
2163
2164 /* Note if the server supports DSN */
2165 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2166 DEBUG(D_transport) debug_printf("%susing DSN\n",
2167 sx->peer_offered & OPTION_DSN ? "" : "not ");
2168
2169 /* Note if the response to EHLO specifies support for the AUTH extension.
2170 If it has, check that this host is one we want to authenticate to, and do
2171 the business. The host name and address must be available when the
2172 authenticator's client driver is running. */
2173
2174 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2175 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2176 {
2177 default: goto SEND_QUIT;
2178 case OK: break;
2179 case FAIL_SEND: goto SEND_FAILED;
2180 case FAIL: goto RESPONSE_FAILED;
2181 }
2182 }
2183 }
2184 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2185
2186 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2187 message-specific. */
2188
2189 sx->setting_up = FALSE;
2190
2191 #ifdef SUPPORT_I18N
2192 if (sx->addrlist->prop.utf8_msg)
2193 {
2194 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2195 && !sx->addrlist->prop.utf8_downcvt_maybe;
2196 DEBUG(D_transport) if (!sx->utf8_needed)
2197 debug_printf("utf8: %s downconvert\n",
2198 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2199 }
2200
2201 /* If this is an international message we need the host to speak SMTPUTF8 */
2202 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2203 {
2204 errno = ERRNO_UTF8_FWD;
2205 goto RESPONSE_FAILED;
2206 }
2207 #endif
2208
2209 return OK;
2210
2211
2212 {
2213 int code;
2214
2215 RESPONSE_FAILED:
2216 message = NULL;
2217 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2218 sx->buffer, &code, &message, &pass_message);
2219 goto FAILED;
2220
2221 SEND_FAILED:
2222 code = '4';
2223 message = US string_sprintf("send() to %s [%s] failed: %s",
2224 sx->host->name, sx->host->address, strerror(errno));
2225 sx->send_quit = FALSE;
2226 goto FAILED;
2227
2228 EHLOHELO_FAILED:
2229 code = '4';
2230 message = string_sprintf("Remote host closed connection in response to %s"
2231 " (EHLO response was: %s)", smtp_command, sx->buffer);
2232 sx->send_quit = FALSE;
2233 goto FAILED;
2234
2235 /* This label is jumped to directly when a TLS negotiation has failed,
2236 or was not done for a host for which it is required. Values will be set
2237 in message and errno, and setting_up will always be true. Treat as
2238 a temporary error. */
2239
2240 #ifdef SUPPORT_TLS
2241 TLS_FAILED:
2242 code = '4';
2243 goto FAILED;
2244 #endif
2245
2246 /* The failure happened while setting up the call; see if the failure was
2247 a 5xx response (this will either be on connection, or following HELO - a 5xx
2248 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2249 fail all addresses, as this host is never going to accept them. For other
2250 errors during setting up (timeouts or whatever), defer all addresses, and
2251 yield DEFER, so that the host is not tried again for a while.
2252
2253 XXX This peeking for another host feels like a layering violation. We want
2254 to note the host as unusable, but down here we shouldn't know if this was
2255 the last host to try for the addr(list). Perhaps the upper layer should be
2256 the one to do set_errno() ? The problem is that currently the addr is where
2257 errno etc. are stashed, but until we run out of hosts to try the errors are
2258 host-specific. Maybe we should enhance the host_item definition? */
2259
2260 FAILED:
2261 sx->ok = FALSE; /* For when reached by GOTO */
2262 set_errno(sx->addrlist, errno, message,
2263 sx->host->next
2264 ? DEFER
2265 : code == '5'
2266 #ifdef SUPPORT_I18N
2267 || errno == ERRNO_UTF8_FWD
2268 #endif
2269 ? FAIL : DEFER,
2270 pass_message, sx->host
2271 #ifdef EXPERIMENTAL_DSN_INFO
2272 , sx->smtp_greeting, sx->helo_response
2273 #endif
2274 );
2275 yield = DEFER;
2276 }
2277
2278
2279 SEND_QUIT:
2280
2281 if (sx->send_quit)
2282 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2283
2284 #ifdef SUPPORT_TLS
2285 if (sx->cctx.tls_ctx)
2286 {
2287 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2288 sx->cctx.tls_ctx = NULL;
2289 }
2290 #endif
2291
2292 /* Close the socket, and return the appropriate value, first setting
2293 works because the NULL setting is passed back to the calling process, and
2294 remote_max_parallel is forced to 1 when delivering over an existing connection,
2295 */
2296
2297 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2298 if (sx->send_quit)
2299 {
2300 shutdown(sx->cctx.sock, SHUT_WR);
2301 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2302 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2303 rc--; /* drain socket */
2304 sx->send_quit = FALSE;
2305 }
2306 (void)close(sx->cctx.sock);
2307 sx->cctx.sock = -1;
2308
2309 #ifndef DISABLE_EVENT
2310 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2311 #endif
2312
2313 continue_transport = NULL;
2314 continue_hostname = NULL;
2315 return yield;
2316 }
2317
2318
2319
2320
2321 /* Create the string of options that will be appended to the MAIL FROM:
2322 in the connection context buffer */
2323
2324 static int
2325 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2326 {
2327 uschar * p = sx->buffer;
2328 address_item * addr;
2329 int address_count;
2330
2331 *p = 0;
2332
2333 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2334 send it, adding something to the message size to allow for imprecision
2335 and things that get added en route. Exim keeps the number of lines
2336 in a message, so we can give an accurate value for the original message, but we
2337 need some additional to handle added headers. (Double "." characters don't get
2338 included in the count.) */
2339
2340 if ( message_size > 0
2341 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2342 {
2343 /*XXX problem here under spool_files_wireformat?
2344 Or just forget about lines? Or inflate by a fixed proportion? */
2345
2346 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2347 while (*p) p++;
2348 }
2349
2350 #ifndef DISABLE_PRDR
2351 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2352 request that */
2353
2354 sx->prdr_active = FALSE;
2355 if (sx->peer_offered & OPTION_PRDR)
2356 for (addr = addrlist; addr; addr = addr->next)
2357 if (addr->transport_return == PENDING_DEFER)
2358 {
2359 for (addr = addr->next; addr; addr = addr->next)
2360 if (addr->transport_return == PENDING_DEFER)
2361 { /* at least two recipients to send */
2362 sx->prdr_active = TRUE;
2363 sprintf(CS p, " PRDR"); p += 5;
2364 break;
2365 }
2366 break;
2367 }
2368 #endif
2369
2370 #ifdef SUPPORT_I18N
2371 /* If it supports internationalised messages, and this meesage need that,
2372 request it */
2373
2374 if ( sx->peer_offered & OPTION_UTF8
2375 && addrlist->prop.utf8_msg
2376 && !addrlist->prop.utf8_downcvt
2377 )
2378 Ustrcpy(p, " SMTPUTF8"), p += 9;
2379 #endif
2380
2381 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2382 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2383 addr && address_count < sx->max_rcpt;
2384 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2385 {
2386 address_count++;
2387 if (!(addr->dsn_flags & rf_dsnlasthop))
2388 {
2389 sx->dsn_all_lasthop = FALSE;
2390 break;
2391 }
2392 }
2393
2394 /* Add any DSN flags to the mail command */
2395
2396 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2397 {
2398 if (dsn_ret == dsn_ret_hdrs)
2399 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2400 else if (dsn_ret == dsn_ret_full)
2401 { Ustrcpy(p, " RET=FULL"); p += 9; }
2402
2403 if (dsn_envid)
2404 {
2405 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2406 while (*p) p++;
2407 }
2408 }
2409
2410 /* If an authenticated_sender override has been specified for this transport
2411 instance, expand it. If the expansion is forced to fail, and there was already
2412 an authenticated_sender for this message, the original value will be used.
2413 Other expansion failures are serious. An empty result is ignored, but there is
2414 otherwise no check - this feature is expected to be used with LMTP and other
2415 cases where non-standard addresses (e.g. without domains) might be required. */
2416
2417 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2418 return ERROR;
2419
2420 return OK;
2421 }
2422
2423
2424 static void
2425 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2426 {
2427 uschar * p = sx->buffer;
2428 *p = 0;
2429
2430 /* Add any DSN flags to the rcpt command */
2431
2432 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2433 {
2434 if (addr->dsn_flags & rf_dsnflags)
2435 {
2436 int i;
2437 BOOL first = TRUE;
2438
2439 Ustrcpy(p, " NOTIFY=");
2440 while (*p) p++;
2441 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2442 {
2443 if (!first) *p++ = ',';
2444 first = FALSE;
2445 Ustrcpy(p, rf_names[i]);
2446 while (*p) p++;
2447 }
2448 }
2449
2450 if (addr->dsn_orcpt)
2451 {
2452 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2453 addr->dsn_orcpt);
2454 while (*p) p++;
2455 }
2456 }
2457 }
2458
2459
2460
2461 /*
2462 Return:
2463 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2464 -1 MAIL response error
2465 -2 any non-MAIL read i/o error
2466 -3 non-MAIL response timeout
2467 -4 internal error; channel still usable
2468 -5 transmit failed
2469 */
2470
2471 int
2472 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2473 {
2474 address_item * addr;
2475 int address_count;
2476 int rc;
2477
2478 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2479 {
2480 *yield = ERROR;
2481 return -4;
2482 }
2483
2484 /* From here until we send the DATA command, we can make use of PIPELINING
2485 if the server host supports it. The code has to be able to check the responses
2486 at any point, for when the buffer fills up, so we write it totally generally.
2487 When PIPELINING is off, each command written reports that it has flushed the
2488 buffer. */
2489
2490 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2491
2492 {
2493 uschar * s = sx->from_addr;
2494 #ifdef SUPPORT_I18N
2495 uschar * errstr = NULL;
2496
2497 /* If we must downconvert, do the from-address here. Remember we had to
2498 for the to-addresses (done below), and also (ugly) for re-doing when building
2499 the delivery log line. */
2500
2501 if ( sx->addrlist->prop.utf8_msg
2502 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2503 )
2504 {
2505 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2506 {
2507 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2508 *yield = ERROR;
2509 return -4;
2510 }
2511 setflag(sx->addrlist, af_utf8_downcvt);
2512 }
2513 #endif
2514
2515 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2516 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2517 }
2518
2519 mail_command = string_copy(big_buffer); /* Save for later error message */
2520
2521 switch(rc)
2522 {
2523 case -1: /* Transmission error */
2524 return -5;
2525
2526 case +1: /* Cmd was sent */
2527 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2528 sx->ob->command_timeout))
2529 {
2530 if (errno == 0 && sx->buffer[0] == '4')
2531 {
2532 errno = ERRNO_MAIL4XX;
2533 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2534 }
2535 return -1;
2536 }
2537 sx->pending_MAIL = FALSE;
2538 break;
2539
2540 /* otherwise zero: command queued for pipeline */
2541 }
2542
2543 /* Pass over all the relevant recipient addresses for this host, which are the
2544 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2545 several before we have to read the responses for those seen so far. This
2546 checking is done by a subroutine because it also needs to be done at the end.
2547 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2548 the next one if not all are sent.
2549
2550 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2551 last address because we want to abort if any recipients have any kind of
2552 problem, temporary or permanent. We know that all recipient addresses will have
2553 the PENDING_DEFER status, because only one attempt is ever made, and we know
2554 that max_rcpt will be large, so all addresses will be done at once.
2555
2556 For verify we flush the pipeline after any (the only) rcpt address. */
2557
2558 for (addr = sx->first_addr, address_count = 0;
2559 addr && address_count < sx->max_rcpt;
2560 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2561 {
2562 int count;
2563 BOOL no_flush;
2564 uschar * rcpt_addr;
2565
2566 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2567 {
2568 setflag(addr, af_tcp_fastopen_conn);
2569 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2570 }
2571
2572 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2573 ? dsn_support_yes : dsn_support_no;
2574
2575 address_count++;
2576 no_flush = pipelining_active && !sx->verify
2577 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2578
2579 build_rcptcmd_options(sx, addr);
2580
2581 /* Now send the RCPT command, and process outstanding responses when
2582 necessary. After a timeout on RCPT, we just end the function, leaving the
2583 yield as OK, because this error can often mean that there is a problem with
2584 just one address, so we don't want to delay the host. */
2585
2586 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2587
2588 #ifdef SUPPORT_I18N
2589 if ( testflag(sx->addrlist, af_utf8_downcvt)
2590 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2591 )
2592 {
2593 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2594 errno = ERRNO_EXPANDFAIL;
2595 return -5; /*XXX too harsh? */
2596 }
2597 #endif
2598
2599 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2600 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2601
2602 if (count < 0) return -5;
2603 if (count > 0)
2604 {
2605 switch(sync_responses(sx, count, 0))
2606 {
2607 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2608 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2609 break;
2610
2611 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2612 if (!sx->lmtp) /* can't tell about progress yet */
2613 sx->completed_addr = TRUE;
2614 case 0: /* No 2xx or 5xx, but no probs */
2615 break;
2616
2617 case -1: return -3; /* Timeout on RCPT */
2618 case -2: return -2; /* non-MAIL read i/o error */
2619 default: return -1; /* any MAIL error */
2620 }
2621 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2622 }
2623 } /* Loop for next address */
2624
2625 tcp_out_fastopen_logged = TRUE;
2626 sx->next_addr = addr;
2627 return 0;
2628 }
2629
2630
2631 #ifdef SUPPORT_TLS
2632 /*****************************************************
2633 * Proxy TLS connection for another transport process *
2634 ******************************************************/
2635 /*
2636 Close the unused end of the pipe, fork once more, then use the given buffer
2637 as a staging area, and select on both the given fd and the TLS'd client-fd for
2638 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2639 Do blocking full-size writes, and reads under a timeout. Once both input
2640 channels are closed, exit the process.
2641
2642 Arguments:
2643 ct_ctx tls context
2644 buf space to use for buffering
2645 bufsiz size of buffer
2646 pfd pipe filedescriptor array; [0] is comms to proxied process
2647 timeout per-read timeout, seconds
2648 */
2649
2650 void
2651 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
2652 int timeout)
2653 {
2654 fd_set rfds, efds;
2655 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
2656 int rc, i, fd_bits, nbytes;
2657
2658 close(pfd[1]);
2659 if ((rc = fork()))
2660 {
2661 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2662 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2663 }
2664
2665 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2666 set_process_info("proxying TLS connection for continued transport");
2667 FD_ZERO(&rfds);
2668 FD_SET(tls_out.active.sock, &rfds);
2669 FD_SET(pfd[0], &rfds);
2670
2671 for (fd_bits = 3; fd_bits; )
2672 {
2673 time_t time_left = timeout;
2674 time_t time_start = time(NULL);
2675
2676 /* wait for data */
2677 efds = rfds;
2678 do
2679 {
2680 struct timeval tv = { time_left, 0 };
2681
2682 rc = select(max_fd,
2683 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2684
2685 if (rc < 0 && errno == EINTR)
2686 if ((time_left -= time(NULL) - time_start) > 0) continue;
2687
2688 if (rc <= 0)
2689 {
2690 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2691 goto done;
2692 }
2693
2694 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
2695 {
2696 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2697 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2698 goto done;
2699 }
2700 }
2701 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
2702
2703 /* handle inbound data */
2704 if (FD_ISSET(tls_out.active.sock, &rfds))
2705 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
2706 {
2707 fd_bits &= ~1;
2708 FD_CLR(tls_out.active.sock, &rfds);
2709 shutdown(pfd[0], SHUT_WR);
2710 timeout = 5;
2711 }
2712 else
2713 {
2714 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2715 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2716 }
2717 else if (fd_bits & 1)
2718 FD_SET(tls_out.active.sock, &rfds);
2719
2720 /* handle outbound data */
2721 if (FD_ISSET(pfd[0], &rfds))
2722 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2723 {
2724 fd_bits = 0;
2725 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
2726 ct_ctx = NULL;
2727 }
2728 else
2729 {
2730 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2731 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
2732 goto done;
2733 }
2734 else if (fd_bits & 2)
2735 FD_SET(pfd[0], &rfds);
2736 }
2737
2738 done:
2739 if (running_in_test_harness) millisleep(100); /* let logging complete */
2740 exim_exit(0, US"TLS proxy");
2741 }
2742 #endif
2743
2744
2745 /*************************************************
2746 * Deliver address list to given host *
2747 *************************************************/
2748
2749 /* If continue_hostname is not null, we get here only when continuing to
2750 deliver down an existing channel. The channel was passed as the standard
2751 input. TLS is never active on a passed channel; the previous process always
2752 closes it down before passing the connection on.
2753
2754 Otherwise, we have to make a connection to the remote host, and do the
2755 initial protocol exchange.
2756
2757 When running as an MUA wrapper, if the sender or any recipient is rejected,
2758 temporarily or permanently, we force failure for all recipients.
2759
2760 Arguments:
2761 addrlist chain of potential addresses to deliver; only those whose
2762 transport_return field is set to PENDING_DEFER are currently
2763 being processed; others should be skipped - they have either
2764 been delivered to an earlier host or IP address, or been
2765 failed by one of them.
2766 host host to deliver to
2767 host_af AF_INET or AF_INET6
2768 defport default TCP/IP port to use if host does not specify, in host
2769 byte order
2770 interface interface to bind to, or NULL
2771 tblock transport instance block
2772 message_defer set TRUE if yield is OK, but all addresses were deferred
2773 because of a non-recipient, non-host failure, that is, a
2774 4xx response to MAIL FROM, DATA, or ".". This is a defer
2775 that is specific to the message.
2776 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2777 a second attempt after TLS initialization fails
2778
2779 Returns: OK - the connection was made and the delivery attempted;
2780 the result for each address is in its data block.
2781 DEFER - the connection could not be made, or something failed
2782 while setting up the SMTP session, or there was a
2783 non-message-specific error, such as a timeout.
2784 ERROR - a filter command is specified for this transport,
2785 and there was a problem setting it up; OR helo_data
2786 or add_headers or authenticated_sender is specified
2787 for this transport, and the string failed to expand
2788 */
2789
2790 static int
2791 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2792 uschar *interface, transport_instance *tblock,
2793 BOOL *message_defer, BOOL suppress_tls)
2794 {
2795 address_item *addr;
2796 int yield = OK;
2797 int save_errno;
2798 int rc;
2799 struct timeval start_delivery_time;
2800
2801 BOOL pass_message = FALSE;
2802 uschar *message = NULL;
2803 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2804
2805 smtp_context sx;
2806
2807 gettimeofday(&start_delivery_time, NULL);
2808 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2809 *message_defer = FALSE;
2810
2811 sx.addrlist = addrlist;
2812 sx.host = host;
2813 sx.host_af = host_af,
2814 sx.port = defport;
2815 sx.interface = interface;
2816 sx.helo_data = NULL;
2817 sx.tblock = tblock;
2818 sx.verify = FALSE;
2819
2820 /* Get the channel set up ready for a message (MAIL FROM being the next
2821 SMTP command to send */
2822
2823 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2824 return rc;
2825
2826 /* If there is a filter command specified for this transport, we can now
2827 set it up. This cannot be done until the identify of the host is known. */
2828
2829 if (tblock->filter_command)
2830 {
2831 transport_filter_timeout = tblock->filter_timeout;
2832
2833 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2834 yield ERROR. */
2835
2836 if (!transport_set_up_command(&transport_filter_argv,
2837 tblock->filter_command, TRUE, DEFER, addrlist,
2838 string_sprintf("%.50s transport", tblock->name), NULL))
2839 {
2840 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2841 FALSE);
2842 yield = ERROR;
2843 goto SEND_QUIT;
2844 }
2845
2846 if ( transport_filter_argv
2847 && *transport_filter_argv
2848 && **transport_filter_argv
2849 && sx.peer_offered & OPTION_CHUNKING
2850 )
2851 {
2852 sx.peer_offered &= ~OPTION_CHUNKING;
2853 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2854 }
2855 }
2856
2857 sx.first_addr = addrlist;
2858
2859 /* For messages that have more than the maximum number of envelope recipients,
2860 we want to send several transactions down the same SMTP connection. (See
2861 comments in deliver.c as to how this reconciles, heuristically, with
2862 remote_max_parallel.) This optimization was added to Exim after the following
2863 code was already working. The simplest way to put it in without disturbing the
2864 code was to use a goto to jump back to this point when there is another
2865 transaction to handle. */
2866
2867 SEND_MESSAGE:
2868 sx.from_addr = return_path;
2869 sx.sync_addr = sx.first_addr;
2870 sx.ok = FALSE;
2871 sx.send_rset = TRUE;
2872 sx.completed_addr = FALSE;
2873
2874
2875 /* If we are a continued-connection-after-verify the MAIL and RCPT
2876 commands were already sent; do not re-send but do mark the addrs as
2877 having been accepted up to RCPT stage. A traditional cont-conn
2878 always has a sequence number greater than one. */
2879
2880 if (continue_hostname && continue_sequence == 1)
2881 {
2882 address_item * addr;
2883
2884 sx.peer_offered = smtp_peer_options;
2885 sx.pending_MAIL = FALSE;
2886 sx.ok = TRUE;
2887 sx.next_addr = NULL;
2888
2889 for (addr = addrlist; addr; addr = addr->next)
2890 addr->transport_return = PENDING_OK;
2891 }
2892 else
2893 {
2894 /* Initiate a message transfer. */
2895
2896 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2897 {
2898 case 0: break;
2899 case -1: case -2: goto RESPONSE_FAILED;
2900 case -3: goto END_OFF;
2901 case -4: goto SEND_QUIT;
2902 default: goto SEND_FAILED;
2903 }
2904
2905 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2906 permanently or temporarily. We should have flushed and synced after the last
2907 RCPT. */
2908
2909 if (mua_wrapper)
2910 {
2911 address_item * a;
2912 unsigned cnt;
2913
2914 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2915 if (a->transport_return != PENDING_OK)
2916 {
2917 /*XXX could we find a better errno than 0 here? */
2918 set_errno_nohost(addrlist, 0, a->message, FAIL,
2919 testflag(a, af_pass_message));
2920 sx.ok = FALSE;
2921 break;
2922 }
2923 }
2924 }
2925
2926 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2927 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2928 have a good recipient buffered up if we are pipelining. We don't want to waste
2929 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2930 are pipelining. The responses are all handled by sync_responses().
2931 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2932 to send is. */
2933
2934 if ( !(sx.peer_offered & OPTION_CHUNKING)
2935 && (sx.ok || (pipelining_active && !mua_wrapper)))
2936 {
2937 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2938
2939 if (count < 0) goto SEND_FAILED;
2940 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2941 {
2942 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2943 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2944 break;
2945
2946 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2947 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2948 case 0: break; /* No 2xx or 5xx, but no probs */
2949
2950 case -1: goto END_OFF; /* Timeout on RCPT */
2951 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2952 }
2953 pipelining_active = FALSE;
2954 data_command = string_copy(big_buffer); /* Save for later error message */
2955 }
2956
2957 /* If there were no good recipients (but otherwise there have been no
2958 problems), just set ok TRUE, since we have handled address-specific errors
2959 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2960 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2961 well as body. Set the appropriate timeout value to be used for each chunk.
2962 (Haven't been able to make it work using select() for writing yet.) */
2963
2964 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2965 {
2966 /* Save the first address of the next batch. */
2967 sx.first_addr = sx.next_addr;
2968
2969 sx.ok = TRUE;
2970 }
2971 else
2972 {
2973 transport_ctx tctx = {
2974 {sx.cctx.sock}, /*XXX will this need TLS info? */
2975 tblock,
2976 addrlist,
2977 US".", US"..", /* Escaping strings */
2978 topt_use_crlf | topt_escape_headers
2979 | (tblock->body_only ? topt_no_headers : 0)
2980 | (tblock->headers_only ? topt_no_body : 0)
2981 | (tblock->return_path_add ? topt_add_return_path : 0)
2982 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2983 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2984 };
2985
2986 /* If using CHUNKING we need a callback from the generic transport
2987 support to us, for the sending of BDAT smtp commands and the reaping
2988 of responses. The callback needs a whole bunch of state so set up
2989 a transport-context structure to be passed around. */
2990
2991 if (sx.peer_offered & OPTION_CHUNKING)
2992 {
2993 tctx.check_string = tctx.escape_string = NULL;
2994 tctx.options |= topt_use_bdat;
2995 tctx.chunk_cb = smtp_chunk_cmd_callback;
2996 sx.pending_BDAT = FALSE;
2997 sx.good_RCPT = sx.ok;
2998 sx.cmd_count = 0;
2999 tctx.smtp_context = &sx;
3000 }
3001 else
3002 tctx.options |= topt_end_dot;
3003
3004 /* Save the first address of the next batch. */
3005 sx.first_addr = sx.next_addr;
3006
3007 /* Responses from CHUNKING commands go in buffer. Otherwise,
3008 there has not been a response. */
3009
3010 sx.buffer[0] = 0;
3011
3012 sigalrm_seen = FALSE;
3013 transport_write_timeout = sx.ob->data_timeout;
3014 smtp_command = US"sending data block"; /* For error messages */
3015 DEBUG(D_transport|D_v)
3016 if (sx.peer_offered & OPTION_CHUNKING)
3017 debug_printf(" will write message using CHUNKING\n");
3018 else
3019 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3020 transport_count = 0;
3021
3022 #ifndef DISABLE_DKIM
3023 dkim_exim_sign_init();
3024 # ifdef EXPERIMENTAL_ARC
3025 {
3026 uschar * s = sx.ob->arc_sign;
3027 if (s)
3028 {
3029 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3030 {
3031 if (!expand_string_forcedfail)
3032 {
3033 message = US"failed to expand arc_sign";
3034 sx.ok = FALSE;
3035 goto SEND_FAILED;
3036 }
3037 }
3038 else if (*s)
3039 {
3040 /* Ask dkim code to hash the body for ARC */
3041 (void) arc_ams_setup_sign_bodyhash();
3042 sx.ob->dkim.force_bodyhash = TRUE;
3043 }
3044 }
3045 }
3046 # endif
3047 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3048 #else
3049 sx.ok = transport_write_message(&tctx, 0);
3050 #endif
3051
3052 /* transport_write_message() uses write() because it is called from other
3053 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3054 it can exit with "Broken pipe" as its error. This really means that the
3055 socket got closed at the far end. */
3056
3057 transport_write_timeout = 0; /* for subsequent transports */
3058
3059 /* Failure can either be some kind of I/O disaster (including timeout),
3060 or the failure of a transport filter or the expansion of added headers.
3061 Or, when CHUNKING, it can be a protocol-detected failure. */
3062
3063 if (!sx.ok)
3064 if (message) goto SEND_FAILED;
3065 else goto RESPONSE_FAILED;
3066
3067 /* We used to send the terminating "." explicitly here, but because of
3068 buffering effects at both ends of TCP/IP connections, you don't gain
3069 anything by keeping it separate, so it might as well go in the final
3070 data buffer for efficiency. This is now done by setting the topt_end_dot
3071 flag above. */
3072
3073 smtp_command = US"end of data";
3074
3075 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3076 {
3077 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3078 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3079 {
3080 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3081 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3082 break;
3083
3084 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3085 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3086 case 0: break; /* No 2xx or 5xx, but no probs */
3087
3088 case -1: goto END_OFF; /* Timeout on RCPT */
3089 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3090 }
3091 }
3092
3093 #ifndef DISABLE_PRDR
3094 /* For PRDR we optionally get a partial-responses warning
3095 * followed by the individual responses, before going on with
3096 * the overall response. If we don't get the warning then deal
3097 * with per non-PRDR. */
3098 if(sx.prdr_active)
3099 {
3100 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3101 sx.ob->final_timeout);
3102 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3103 {
3104 case '2': sx.prdr_active = FALSE;
3105 sx.ok = TRUE;
3106 break;
3107 case '4': errno = ERRNO_DATA4XX;
3108 addrlist->more_errno |=
3109 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3110 break;
3111 }
3112 }
3113 else
3114 #endif
3115
3116 /* For non-PRDR SMTP, we now read a single response that applies to the
3117 whole message. If it is OK, then all the addresses have been delivered. */
3118
3119 if (!sx.lmtp)
3120 {
3121 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3122 sx.ob->final_timeout);
3123 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3124 {
3125 errno = ERRNO_DATA4XX;
3126 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3127 }
3128 }
3129
3130 /* For LMTP, we get back a response for every RCPT command that we sent;
3131 some may be accepted and some rejected. For those that get a response, their
3132 status is fixed; any that are accepted have been handed over, even if later
3133 responses crash - at least, that's how I read RFC 2033.
3134
3135 If all went well, mark the recipient addresses as completed, record which
3136 host/IPaddress they were delivered to, and cut out RSET when sending another
3137 message down the same channel. Write the completed addresses to the journal
3138 now so that they are recorded in case there is a crash of hardware or
3139 software before the spool gets updated. Also record the final SMTP
3140 confirmation if needed (for SMTP only). */
3141
3142 if (sx.ok)
3143 {
3144 int flag = '=';
3145 struct timeval delivery_time;
3146 int len;
3147 uschar * conf = NULL;
3148
3149 timesince(&delivery_time, &start_delivery_time);
3150 sx.send_rset = FALSE;
3151 pipelining_active = FALSE;
3152
3153 /* Set up confirmation if needed - applies only to SMTP */
3154
3155 if (
3156 #ifdef DISABLE_EVENT
3157 LOGGING(smtp_confirmation) &&
3158 #endif
3159 !sx.lmtp
3160 )
3161 {
3162 const uschar *s = string_printing(sx.buffer);
3163 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3164 conf = (s == sx.buffer)? US string_copy(s) : US s;
3165 }
3166
3167 /* Process all transported addresses - for LMTP or PRDR, read a status for
3168 each one. */
3169
3170 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3171 {
3172 if (addr->transport_return != PENDING_OK) continue;
3173
3174 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3175 remaining addresses. Otherwise, it's a return code for just the one
3176 address. For temporary errors, add a retry item for the address so that
3177 it doesn't get tried again too soon. */
3178
3179 #ifndef DISABLE_PRDR
3180 if (sx.lmtp || sx.prdr_active)
3181 #else
3182 if (sx.lmtp)
3183 #endif
3184 {
3185 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3186 sx.ob->final_timeout))
3187 {
3188 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3189 addr->message = string_sprintf(
3190 #ifndef DISABLE_PRDR
3191 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3192 #else
3193 "LMTP error after %s: %s",
3194 #endif
3195 data_command, string_printing(sx.buffer));
3196 setflag(addr, af_pass_message); /* Allow message to go to user */
3197 if (sx.buffer[0] == '5')
3198 addr->transport_return = FAIL;
3199 else
3200 {
3201 errno = ERRNO_DATA4XX;
3202 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3203 addr->transport_return = DEFER;
3204 #ifndef DISABLE_PRDR
3205 if (!sx.prdr_active)
3206 #endif
3207 retry_add_item(addr, addr->address_retry_key, 0);
3208 }
3209 continue;
3210 }
3211 sx.completed_addr = TRUE; /* NOW we can set this flag */
3212 if (LOGGING(smtp_confirmation))
3213 {
3214 const uschar *s = string_printing(sx.buffer);
3215 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3216 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3217 }
3218 }
3219
3220 /* SMTP, or success return from LMTP for this address. Pass back the
3221 actual host that was used. */
3222
3223 addr->transport_return = OK;
3224 addr->more_errno = delivery_time.tv_sec;
3225 addr->delivery_usec = delivery_time.tv_usec;
3226 addr->host_used = host;
3227 addr->special_action = flag;
3228 addr->message = conf;
3229 #ifndef DISABLE_PRDR
3230 if (sx.prdr_active) setflag(addr, af_prdr_used);
3231 #endif
3232 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3233 flag = '-';
3234
3235 #ifndef DISABLE_PRDR
3236 if (!sx.prdr_active)
3237 #endif
3238 {
3239 /* Update the journal. For homonymic addresses, use the base address plus
3240 the transport name. See lots of comments in deliver.c about the reasons
3241 for the complications when homonyms are involved. Just carry on after
3242 write error, as it may prove possible to update the spool file later. */
3243
3244 if (testflag(addr, af_homonym))
3245 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3246 else
3247 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3248
3249 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3250 len = Ustrlen(CS sx.buffer);
3251 if (write(journal_fd, sx.buffer, len) != len)
3252 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3253 "%s: %s", sx.buffer, strerror(errno));
3254 }
3255 }
3256
3257 #ifndef DISABLE_PRDR
3258 if (sx.prdr_active)
3259 {
3260 const uschar * overall_message;
3261
3262 /* PRDR - get the final, overall response. For any non-success
3263 upgrade all the address statuses. */
3264
3265 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3266 sx.ob->final_timeout);
3267 if (!sx.ok)
3268 {
3269 if(errno == 0 && sx.buffer[0] == '4')
3270 {
3271 errno = ERRNO_DATA4XX;
3272 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3273 }
3274 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3275 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3276 addr->transport_return = PENDING_OK; /* allow set_errno action */
3277 goto RESPONSE_FAILED;
3278 }
3279
3280 /* Append the overall response to the individual PRDR response for logging
3281 and update the journal, or setup retry. */
3282
3283 overall_message = string_printing(sx.buffer);
3284 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3285 if (addr->transport_return == OK)
3286 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3287
3288 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3289 if (addr->transport_return == OK)
3290 {
3291 if (testflag(addr, af_homonym))
3292 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3293 else
3294 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3295
3296 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3297 len = Ustrlen(CS sx.buffer);
3298 if (write(journal_fd, sx.buffer, len) != len)
3299 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3300 "%s: %s", sx.buffer, strerror(errno));
3301 }
3302 else if (addr->transport_return == DEFER)
3303 retry_add_item(addr, addr->address_retry_key, -2);
3304 }
3305 #endif
3306
3307 /* Ensure the journal file is pushed out to disk. */
3308
3309 if (EXIMfsync(journal_fd) < 0)
3310 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3311 strerror(errno));
3312 }
3313 }
3314
3315
3316 /* Handle general (not specific to one address) failures here. The value of ok
3317 is used to skip over this code on the falling through case. A timeout causes a
3318 deferral. Other errors may defer or fail according to the response code, and
3319 may set up a special errno value, e.g. after connection chopped, which is
3320 assumed if errno == 0 and there is no text in the buffer. If control reaches
3321 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3322 the problem is not related to this specific message. */
3323
3324 if (!sx.ok)
3325 {
3326 int code, set_rc;
3327 uschar * set_message;
3328
3329 RESPONSE_FAILED:
3330 {
3331 save_errno = errno;
3332 message = NULL;
3333 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3334 sx.buffer, &code, &message, &pass_message);
3335 goto FAILED;
3336 }
3337
3338 SEND_FAILED:
3339 {
3340 save_errno = errno;
3341 code = '4';
3342 message = string_sprintf("send() to %s [%s] failed: %s",
3343 host->name, host->address, message ? message : US strerror(save_errno));
3344 sx.send_quit = FALSE;
3345 goto FAILED;
3346 }
3347
3348 FAILED:
3349 {
3350 BOOL message_error;
3351
3352 sx.ok = FALSE; /* For when reached by GOTO */
3353 set_message = message;
3354
3355 /* We want to handle timeouts after MAIL or "." and loss of connection after
3356 "." specially. They can indicate a problem with the sender address or with
3357 the contents of the message rather than a real error on the connection. These
3358 cases are treated in the same way as a 4xx response. This next bit of code
3359 does the classification. */
3360
3361 switch(save_errno)
3362 {
3363 case 0:
3364 case ERRNO_MAIL4XX:
3365 case ERRNO_DATA4XX:
3366 message_error = TRUE;
3367 break;
3368
3369 case ETIMEDOUT:
3370 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3371 Ustrncmp(smtp_command,"end ",4) == 0;
3372 break;
3373
3374 case ERRNO_SMTPCLOSED:
3375 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3376 break;
3377
3378 default:
3379 message_error = FALSE;
3380 break;
3381 }
3382
3383 /* Handle the cases that are treated as message errors. These are:
3384
3385 (a) negative response or timeout after MAIL
3386 (b) negative response after DATA
3387 (c) negative response or timeout or dropped connection after "."
3388 (d) utf8 support required and not offered
3389
3390 It won't be a negative response or timeout after RCPT, as that is dealt
3391 with separately above. The action in all cases is to set an appropriate
3392 error code for all the addresses, but to leave yield set to OK because the
3393 host itself has not failed. Of course, it might in practice have failed
3394 when we've had a timeout, but if so, we'll discover that at the next
3395 delivery attempt. For a temporary error, set the message_defer flag, and
3396 write to the logs for information if this is not the last host. The error
3397 for the last host will be logged as part of the address's log line. */
3398
3399 if (message_error)
3400 {
3401 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3402
3403 /* If there's an errno, the message contains just the identity of
3404 the host. */
3405
3406 if (code == '5')
3407 set_rc = FAIL;
3408 else /* Anything other than 5 is treated as temporary */
3409 {
3410 set_rc = DEFER;
3411 if (save_errno > 0)
3412 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3413
3414 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3415
3416 *message_defer = TRUE;
3417 }
3418 }
3419
3420 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3421 ".", or some other transportation error. We defer all addresses and yield
3422 DEFER, except for the case of failed add_headers expansion, or a transport
3423 filter failure, when the yield should be ERROR, to stop it trying other
3424 hosts. */
3425
3426 else
3427 {
3428 set_rc = DEFER;
3429 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3430 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3431 }
3432 }
3433
3434 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3435 #ifdef EXPERIMENTAL_DSN_INFO
3436 , sx.smtp_greeting, sx.helo_response
3437 #endif
3438 );
3439 }
3440
3441
3442 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3443 SMTP session tidily. However, if there were too many addresses to send in one
3444 message (indicated by first_addr being non-NULL) we want to carry on with the
3445 rest of them. Also, it is desirable to send more than one message down the SMTP
3446 connection if there are several waiting, provided we haven't already sent so
3447 many as to hit the configured limit. The function transport_check_waiting looks
3448 for a waiting message and returns its id. Then transport_pass_socket tries to
3449 set up a continued delivery by passing the socket on to another process. The
3450 variable send_rset is FALSE if a message has just been successfully transfered.
3451
3452 If we are already sending down a continued channel, there may be further
3453 addresses not yet delivered that are aimed at the same host, but which have not
3454 been passed in this run of the transport. In this case, continue_more will be
3455 true, and all we should do is send RSET if necessary, and return, leaving the
3456 channel open.
3457
3458 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3459 do not want to continue with other messages down the same channel, because that
3460 can lead to looping between two or more messages, all with the same,
3461 temporarily failing address(es). [The retry information isn't updated yet, so
3462 new processes keep on trying.] We probably also don't want to try more of this
3463 message's addresses either.
3464
3465 If we have started a TLS session, we have to end it before passing the
3466 connection to a new process. However, not all servers can handle this (Exim
3467 can), so we do not pass such a connection on if the host matches
3468 hosts_nopass_tls. */
3469
3470 DEBUG(D_transport)
3471 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3472 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3473 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3474
3475 if (sx.completed_addr && sx.ok && sx.send_quit)
3476 {
3477 BOOL more;
3478 smtp_compare_t t_compare;
3479
3480 t_compare.tblock = tblock;
3481 t_compare.current_sender_address = sender_address;
3482
3483 if ( sx.first_addr != NULL
3484 || continue_more
3485 || (
3486 #ifdef SUPPORT_TLS
3487 ( tls_out.active.sock < 0 && !continue_proxy_cipher
3488 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3489 )
3490 &&
3491 #endif
3492 transport_check_waiting(tblock->name, host->name,
3493 tblock->connection_max_messages, new_message_id, &more,
3494 (oicf)smtp_are_same_identities, (void*)&t_compare)
3495 ) )
3496 {
3497 uschar *msg;
3498 BOOL pass_message;
3499
3500 if (sx.send_rset)
3501 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3502 {
3503 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3504 host->address, strerror(errno));
3505 sx.send_quit = FALSE;
3506 }
3507 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3508 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3509 {
3510 int code;
3511 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3512 &pass_message);
3513 if (!sx.send_quit)
3514 {
3515 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3516 host->name, host->address, msg);
3517 }
3518 }
3519
3520 /* Either RSET was not needed, or it succeeded */
3521
3522 if (sx.ok)
3523 {
3524 int pfd[2];
3525 int socket_fd = sx.cctx.sock;
3526
3527
3528 if (sx.first_addr != NULL) /* More addresses still to be sent */
3529 { /* in this run of the transport */
3530 continue_sequence++; /* Causes * in logging */
3531 goto SEND_MESSAGE;
3532 }
3533
3534 /* Unless caller said it already has more messages listed for this host,
3535 pass the connection on to a new Exim process (below, the call to
3536 transport_pass_socket). If the caller has more ready, just return with
3537 the connection still open. */
3538
3539 #ifdef SUPPORT_TLS
3540 if (tls_out.active.sock >= 0)
3541 if ( continue_more
3542 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3543 {
3544 /* Before passing the socket on, or returning to caller with it still
3545 open, we must shut down TLS. Not all MTAs allow for the continuation
3546 of the SMTP session when TLS is shut down. We test for this by sending
3547 a new EHLO. If we don't get a good response, we don't attempt to pass
3548 the socket on. */
3549
3550 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
3551 sx.cctx.tls_ctx = NULL;
3552 smtp_peer_options = smtp_peer_options_wrap;
3553 sx.ok = !sx.smtps
3554 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3555 "EHLO %s\r\n", sx.helo_data) >= 0
3556 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3557 '2', sx.ob->command_timeout);
3558
3559 if (sx.ok && continue_more)
3560 return yield; /* More addresses for another run */
3561 }
3562 else
3563 {
3564 /* Set up a pipe for proxying TLS for the new transport process */
3565
3566 smtp_peer_options |= OPTION_TLS;
3567 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3568 socket_fd = pfd[1];
3569 else
3570 set_errno(sx.first_addr, errno, US"internal allocation problem",
3571 DEFER, FALSE, host
3572 # ifdef EXPERIMENTAL_DSN_INFO
3573 , sx.smtp_greeting, sx.helo_response
3574 # endif
3575 );
3576 }
3577 else
3578 #endif
3579 if (continue_more)
3580 return yield; /* More addresses for another run */
3581
3582 /* If the socket is successfully passed, we mustn't send QUIT (or
3583 indeed anything!) from here. */
3584
3585 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3586 propagate it from the initial
3587 */
3588 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3589 host->address, new_message_id, socket_fd))
3590 {
3591 sx.send_quit = FALSE;
3592
3593 /* We have passed the client socket to a fresh transport process.
3594 If TLS is still active, we need to proxy it for the transport we
3595 just passed the baton to. Fork a child to to do it, and return to
3596 get logging done asap. Which way to place the work makes assumptions
3597 about post-fork prioritisation which may not hold on all platforms. */
3598 #ifdef SUPPORT_TLS
3599 if (tls_out.active.sock >= 0)
3600 {
3601 int pid = fork();
3602 if (pid == 0) /* child; fork again to disconnect totally */
3603 {
3604 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3605 /* does not return */
3606 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
3607 sx.ob->command_timeout);
3608 }
3609
3610 if (pid > 0) /* parent */
3611 {
3612 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3613 close(pfd[0]);
3614 /* tidy the inter-proc to disconn the proxy proc */
3615 waitpid(pid, NULL, 0);
3616 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
3617 sx.cctx.tls_ctx = NULL;
3618 (void)close(sx.cctx.sock);
3619 sx.cctx.sock = -1;
3620 continue_transport = NULL;
3621 continue_hostname = NULL;
3622 return yield;
3623 }
3624 log_write(0, LOG_PANIC_DIE, "fork failed");
3625 }
3626 #endif
3627 }
3628 }
3629
3630 /* If RSET failed and there are addresses left, they get deferred. */
3631 else
3632 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3633 #ifdef EXPERIMENTAL_DSN_INFO
3634 , sx.smtp_greeting, sx.helo_response
3635 #endif
3636 );
3637 }
3638 }
3639
3640 /* End off tidily with QUIT unless the connection has died or the socket has
3641 been passed to another process. There has been discussion on the net about what
3642 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3643 to wait for a response, but on the other hand, there isn't anything one can do
3644 with an error response, other than log it. Exim used to do that. However,
3645 further discussion suggested that it is positively advantageous not to wait for
3646 the response, but to close the session immediately. This is supposed to move
3647 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3648 load from the server. (Hosts that are both servers and clients may not see much
3649 difference, of course.) Further discussion indicated that this was safe to do
3650 on Unix systems which have decent implementations of TCP/IP that leave the
3651 connection around for a while (TIME_WAIT) after the application has gone away.
3652 This enables the response sent by the server to be properly ACKed rather than
3653 timed out, as can happen on broken TCP/IP implementations on other OS.
3654
3655 This change is being made on 31-Jul-98. After over a year of trouble-free
3656 operation, the old commented-out code was removed on 17-Sep-99. */
3657
3658 SEND_QUIT:
3659 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3660
3661 END_OFF:
3662
3663 #ifdef SUPPORT_TLS
3664 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3665 sx.cctx.tls_ctx = NULL;
3666 #endif
3667
3668 /* Close the socket, and return the appropriate value, first setting
3669 works because the NULL setting is passed back to the calling process, and
3670 remote_max_parallel is forced to 1 when delivering over an existing connection,
3671
3672 If all went well and continue_more is set, we shouldn't actually get here if
3673 there are further addresses, as the return above will be taken. However,
3674 writing RSET might have failed, or there may be other addresses whose hosts are
3675 specified in the transports, and therefore not visible at top level, in which
3676 case continue_more won't get set. */
3677
3678 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3679 if (sx.send_quit)
3680 {
3681 shutdown(sx.cctx.sock, SHUT_WR);
3682 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3683 for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3684 rc--; /* drain socket */
3685 }
3686 (void)close(sx.cctx.sock);
3687
3688 #ifndef DISABLE_EVENT
3689 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3690 #endif
3691
3692 continue_transport = NULL;
3693 continue_hostname = NULL;
3694 return yield;
3695 }
3696
3697
3698
3699
3700 /*************************************************
3701 * Closedown entry point *
3702 *************************************************/
3703
3704 /* This function is called when exim is passed an open smtp channel
3705 from another incarnation, but the message which it has been asked
3706 to deliver no longer exists. The channel is on stdin.
3707
3708 We might do fancy things like looking for another message to send down
3709 the channel, but if the one we sought has gone, it has probably been
3710 delivered by some other process that itself will seek further messages,
3711 so just close down our connection.
3712
3713 Argument: pointer to the transport instance block
3714 Returns: nothing
3715 */
3716
3717 void
3718 smtp_transport_closedown(transport_instance *tblock)
3719 {
3720 smtp_transport_options_block *ob =
3721 (smtp_transport_options_block *)tblock->options_block;
3722 client_conn_ctx cctx;
3723 smtp_inblock inblock;
3724 smtp_outblock outblock;
3725 uschar buffer[256];
3726 uschar inbuffer[4096];
3727 uschar outbuffer[16];
3728
3729 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
3730 cctx.sock = fileno(stdin);
3731 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
3732
3733 inblock.cctx = &cctx;
3734 inblock.buffer = inbuffer;
3735 inblock.buffersize = sizeof(inbuffer);
3736 inblock.ptr = inbuffer;
3737 inblock.ptrend = inbuffer;
3738
3739 outblock.cctx = &cctx;
3740 outblock.buffersize = sizeof(outbuffer);
3741 outblock.buffer = outbuffer;
3742 outblock.ptr = outbuffer;
3743 outblock.cmd_count = 0;
3744 outblock.authenticating = FALSE;
3745
3746 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3747 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3748 ob->command_timeout);
3749 (void)close(cctx.sock);
3750 }
3751
3752
3753
3754 /*************************************************
3755 * Prepare addresses for delivery *
3756 *************************************************/
3757
3758 /* This function is called to flush out error settings from previous delivery
3759 attempts to other hosts. It also records whether we got here via an MX record
3760 or not in the more_errno field of the address. We are interested only in
3761 addresses that are still marked DEFER - others may have got delivered to a
3762 previously considered IP address. Set their status to PENDING_DEFER to indicate
3763 which ones are relevant this time.
3764
3765 Arguments:
3766 addrlist the list of addresses
3767 host the host we are delivering to
3768
3769 Returns: the first address for this delivery
3770 */
3771
3772 static address_item *
3773 prepare_addresses(address_item *addrlist, host_item *host)
3774 {
3775 address_item *first_addr = NULL;
3776 address_item *addr;
3777 for (addr = addrlist; addr; addr = addr->next)
3778 if (addr->transport_return == DEFER)
3779 {
3780 if (!first_addr) first_addr = addr;
3781 addr->transport_return = PENDING_DEFER;
3782 addr->basic_errno = 0;
3783 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3784 addr->message = NULL;
3785 #ifdef SUPPORT_TLS
3786 addr->cipher = NULL;
3787 addr->ourcert = NULL;
3788 addr->peercert = NULL;
3789 addr->peerdn = NULL;
3790 addr->ocsp = OCSP_NOT_REQ;
3791 #endif
3792 #ifdef EXPERIMENTAL_DSN_INFO
3793 addr->smtp_greeting = NULL;
3794 addr->helo_response = NULL;
3795 #endif
3796 }
3797 return first_addr;
3798 }
3799
3800
3801
3802 /*************************************************
3803 * Main entry point *
3804 *************************************************/
3805
3806 /* See local README for interface details. As this is a remote transport, it is
3807 given a chain of addresses to be delivered in one connection, if possible. It
3808 always returns TRUE, indicating that each address has its own independent
3809 status set, except if there is a setting up problem, in which case it returns
3810 FALSE. */
3811
3812 BOOL
3813 smtp_transport_entry(
3814 transport_instance *tblock, /* data for this instantiation */
3815 address_item *addrlist) /* addresses we are working on */
3816 {
3817 int cutoff_retry;
3818 int defport;
3819 int hosts_defer = 0;
3820 int hosts_fail = 0;
3821 int hosts_looked_up = 0;
3822 int hosts_retry = 0;
3823 int hosts_serial = 0;
3824 int hosts_total = 0;
3825 int total_hosts_tried = 0;
3826 address_item *addr;
3827 BOOL expired = TRUE;
3828 uschar *expanded_hosts = NULL;
3829 uschar *pistring;
3830 uschar *tid = string_sprintf("%s transport", tblock->name);
3831 smtp_transport_options_block *ob =
3832 (smtp_transport_options_block *)(tblock->options_block);
3833 host_item *hostlist = addrlist->host_list;
3834 host_item *host;
3835
3836 DEBUG(D_transport)
3837 {
3838 debug_printf("%s transport entered\n", tblock->name);
3839 for (addr = addrlist; addr; addr = addr->next)
3840 debug_printf(" %s\n", addr->address);
3841 if (hostlist)
3842 {
3843 debug_printf("hostlist:\n");
3844 for (host = hostlist; host; host = host->next)
3845 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3846 }
3847 if (continue_hostname)
3848 debug_printf("already connected to %s [%s] (on fd %d)\n",
3849 continue_hostname, continue_host_address,
3850 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
3851 }
3852
3853 /* Set the flag requesting that these hosts be added to the waiting
3854 database if the delivery fails temporarily or if we are running with
3855 queue_smtp or a 2-stage queue run. This gets unset for certain
3856 kinds of error, typically those that are specific to the message. */
3857
3858 update_waiting = TRUE;
3859
3860 /* If a host list is not defined for the addresses - they must all have the
3861 same one in order to be passed to a single transport - or if the transport has
3862 a host list with hosts_override set, use the host list supplied with the
3863 transport. It is an error for this not to exist. */
3864
3865 if (!hostlist || (ob->hosts_override && ob->hosts))
3866 {
3867 if (!ob->hosts)
3868 {
3869 addrlist->message = string_sprintf("%s transport called with no hosts set",
3870 tblock->name);
3871 addrlist->transport_return = PANIC;
3872 return FALSE; /* Only top address has status */
3873 }
3874
3875 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3876 ob->hosts);
3877
3878 /* If the transport's host list contains no '$' characters, and we are not
3879 randomizing, it is fixed and therefore a chain of hosts can be built once
3880 and for all, and remembered for subsequent use by other calls to this
3881 transport. If, on the other hand, the host list does contain '$', or we are
3882 randomizing its order, we have to rebuild it each time. In the fixed case,
3883 as the hosts string will never be used again, it doesn't matter that we
3884 replace all the : characters with zeros. */
3885
3886 if (!ob->hostlist)
3887 {
3888 uschar *s = ob->hosts;
3889
3890 if (Ustrchr(s, '$') != NULL)
3891 {
3892 if (!(expanded_hosts = expand_string(s)))
3893 {
3894 addrlist->message = string_sprintf("failed to expand list of hosts "
3895 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3896 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3897 return FALSE; /* Only top address has status */
3898 }
3899 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3900 "\"%s\"\n", s, expanded_hosts);
3901 s = expanded_hosts;
3902 }
3903 else
3904 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3905
3906 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3907
3908 /* Check that the expansion yielded something useful. */
3909 if (!hostlist)
3910 {
3911 addrlist->message =
3912 string_sprintf("%s transport has empty hosts setting", tblock->name);
3913 addrlist->transport_return = PANIC;
3914 return FALSE; /* Only top address has status */
3915 }
3916
3917 /* If there was no expansion of hosts, save the host list for
3918 next time. */
3919
3920 if (!expanded_hosts) ob->hostlist = hostlist;
3921 }
3922
3923 /* This is not the first time this transport has been run in this delivery;
3924 the host list was built previously. */
3925
3926 else
3927 hostlist = ob->hostlist;
3928 }
3929
3930 /* The host list was supplied with the address. If hosts_randomize is set, we
3931 must sort it into a random order if it did not come from MX records and has not
3932 already been randomized (but don't bother if continuing down an existing
3933 connection). */
3934
3935 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3936 {
3937 host_item *newlist = NULL;
3938 while (hostlist)
3939 {
3940 host_item *h = hostlist;
3941 hostlist = hostlist->next;
3942
3943 h->sort_key = random_number(100);
3944
3945 if (!newlist)
3946 {
3947 h->next = NULL;
3948 newlist = h;
3949 }
3950 else if (h->sort_key < newlist->sort_key)
3951 {
3952 h->next = newlist;
3953 newlist = h;
3954 }
3955 else
3956 {
3957 host_item *hh = newlist;
3958 while (hh->next)
3959 {
3960 if (h->sort_key < hh->next->sort_key) break;
3961 hh = hh->next;
3962 }
3963 h->next = hh->next;
3964 hh->next = h;
3965 }
3966 }
3967
3968 hostlist = addrlist->host_list = newlist;
3969 }
3970
3971 /* Sort out the default port. */
3972
3973 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3974
3975 /* For each host-plus-IP-address on the list:
3976
3977 . If this is a continued delivery and the host isn't the one with the
3978 current connection, skip.
3979
3980 . If the status is unusable (i.e. previously failed or retry checked), skip.
3981
3982 . If no IP address set, get the address, either by turning the name into
3983 an address, calling gethostbyname if gethostbyname is on, or by calling
3984 the DNS. The DNS may yield multiple addresses, in which case insert the
3985 extra ones into the list.
3986
3987 . Get the retry data if not previously obtained for this address and set the
3988 field which remembers the state of this address. Skip if the retry time is
3989 not reached. If not, remember whether retry data was found. The retry string
3990 contains both the name and the IP address.
3991
3992 . Scan the list of addresses and mark those whose status is DEFER as
3993 PENDING_DEFER. These are the only ones that will be processed in this cycle
3994 of the hosts loop.
3995
3996 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3997 Some addresses may be successfully delivered, others may fail, and yet
3998 others may get temporary errors and so get marked DEFER.
3999
4000 . The return from the delivery attempt is OK if a connection was made and a
4001 valid SMTP dialogue was completed. Otherwise it is DEFER.
4002
4003 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4004
4005 . If fail to connect, or other defer state, add a retry item.
4006
4007 . If there are any addresses whose status is still DEFER, carry on to the
4008 next host/IPaddress, unless we have tried the number of hosts given
4009 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4010 there is some fancy logic for hosts_max_try that means its limit can be
4011 overstepped in some circumstances.
4012
4013 If we get to the end of the list, all hosts have deferred at least one address,
4014 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4015 delivery attempt to those hosts whose last try was before the arrival time of
4016 the current message. To cope with this, we have to go round the loop a second
4017 time. After that, set the status and error data for any addresses that haven't
4018 had it set already. */
4019
4020 for (cutoff_retry = 0;
4021 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4022 cutoff_retry++)
4023 {
4024 host_item *nexthost = NULL;
4025 int unexpired_hosts_tried = 0;
4026 BOOL continue_host_tried = FALSE;
4027
4028 retry_non_continued:
4029 for (host = hostlist;
4030 host
4031 && unexpired_hosts_tried < ob->hosts_max_try
4032 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4033 host = nexthost)
4034 {
4035 int rc;
4036 int host_af;
4037 uschar *rs;
4038 BOOL host_is_expired = FALSE;
4039 BOOL message_defer = FALSE;
4040 BOOL some_deferred = FALSE;
4041 address_item *first_addr = NULL;
4042 uschar *interface = NULL;
4043 uschar *retry_host_key = NULL;
4044 uschar *retry_message_key = NULL;
4045 uschar *serialize_key = NULL;
4046
4047 /* Default next host is next host. :-) But this can vary if the
4048 hosts_max_try limit is hit (see below). It may also be reset if a host
4049 address is looked up here (in case the host was multihomed). */
4050
4051 nexthost = host->next;
4052
4053 /* If the address hasn't yet been obtained from the host name, look it up
4054 now, unless the host is already marked as unusable. If it is marked as
4055 unusable, it means that the router was unable to find its IP address (in
4056 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4057 the lookup failed last time. We don't get this far if *all* MX records
4058 point to non-existent hosts; that is treated as a hard error.
4059
4060 We can just skip this host entirely. When the hosts came from the router,
4061 the address will timeout based on the other host(s); when the address is
4062 looked up below, there is an explicit retry record added.
4063
4064 Note that we mustn't skip unusable hosts if the address is not unset; they
4065 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4066
4067 if (!host->address)
4068 {
4069 int new_port, flags;
4070 host_item *hh;
4071
4072 if (host->status >= hstatus_unusable)
4073 {
4074 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4075 host->name);
4076 continue;
4077 }
4078
4079 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4080
4081 /* The host name is permitted to have an attached port. Find it, and
4082 strip it from the name. Just remember it for now. */
4083
4084 new_port = host_item_get_port(host);
4085
4086 /* Count hosts looked up */
4087
4088 hosts_looked_up++;
4089
4090 /* Find by name if so configured, or if it's an IP address. We don't
4091 just copy the IP address, because we need the test-for-local to happen. */
4092
4093 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4094 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4095 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4096
4097 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4098 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4099 else
4100 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4101 &ob->dnssec, /* domains for request/require */
4102 NULL, NULL);
4103
4104 /* Update the host (and any additional blocks, resulting from
4105 multihoming) with a host-specific port, if any. */
4106
4107 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4108
4109 /* Failure to find the host at this time (usually DNS temporary failure)
4110 is really a kind of routing failure rather than a transport failure.
4111 Therefore we add a retry item of the routing kind, not to stop us trying
4112 to look this name up here again, but to ensure the address gets timed
4113 out if the failures go on long enough. A complete failure at this point
4114 commonly points to a configuration error, but the best action is still
4115 to carry on for the next host. */
4116
4117 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4118 {
4119 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4120 expired = FALSE;
4121 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4122 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4123 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4124 host->status = hstatus_unusable;
4125
4126 for (addr = addrlist; addr; addr = addr->next)
4127 {
4128 if (addr->transport_return != DEFER) continue;
4129 addr->basic_errno = ERRNO_UNKNOWNHOST;
4130 addr->message = string_sprintf(
4131 rc == HOST_FIND_SECURITY
4132 ? "lookup of IP address for %s was insecure"
4133 : "failed to lookup IP address for %s",
4134 host->name);
4135 }
4136 continue;
4137 }
4138
4139 /* If the host is actually the local host, we may have a problem, or
4140 there may be some cunning configuration going on. In the problem case,
4141 log things and give up. The default transport status is already DEFER. */
4142
4143 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4144 {
4145 for (addr = addrlist; addr; addr = addr->next)
4146 {
4147 addr->basic_errno = 0;
4148 addr->message = string_sprintf("%s transport found host %s to be "
4149 "local", tblock->name, host->name);
4150 }
4151 goto END_TRANSPORT;
4152 }
4153 } /* End of block for IP address lookup */
4154
4155 /* If this is a continued delivery, we are interested only in the host
4156 which matches the name of the existing open channel. The check is put
4157 here after the local host lookup, in case the name gets expanded as a
4158 result of the lookup. Set expired FALSE, to save the outer loop executing
4159 twice. */
4160
4161 if (continue_hostname)
4162 if ( Ustrcmp(continue_hostname, host->name) != 0
4163 || Ustrcmp(continue_host_address, host->address) != 0
4164 )
4165 {
4166 expired = FALSE;
4167 continue; /* With next host */
4168 }
4169 else
4170 continue_host_tried = TRUE;
4171
4172 /* Reset the default next host in case a multihomed host whose addresses
4173 are not looked up till just above added to the host list. */
4174
4175 nexthost = host->next;
4176
4177 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4178 domain is in queue_smtp_domains, we don't actually want to attempt any
4179 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4180 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4181 were not in it. We don't want to hold up all SMTP deliveries! Except when
4182 doing a two-stage queue run, don't do this if forcing. */
4183
4184 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4185 match_isinlist(addrlist->domain,
4186 (const uschar **)&queue_smtp_domains, 0,
4187 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4188 {
4189 expired = FALSE;
4190 for (addr = addrlist; addr; addr = addr->next)
4191 if (addr->transport_return == DEFER)
4192 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4193 continue; /* With next host */
4194 }
4195
4196 /* Count hosts being considered - purely for an intelligent comment
4197 if none are usable. */
4198
4199 hosts_total++;
4200
4201 /* Set $host and $host address now in case they are needed for the
4202 interface expansion or the serialize_hosts check; they remain set if an
4203 actual delivery happens. */
4204
4205 deliver_host = host->name;
4206 deliver_host_address = host->address;
4207 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4208 : host->dnssec == DS_NO ? US"no"
4209 : US"";
4210
4211 /* Set up a string for adding to the retry key if the port number is not
4212 the standard SMTP port. A host may have its own port setting that overrides
4213 the default. */
4214
4215 pistring = string_sprintf(":%d", host->port == PORT_NONE
4216 ? defport : host->port);
4217 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4218
4219 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4220 string is set, even if constant (as different transports can have different
4221 constant settings), we must add it to the key that is used for retries,
4222 because connections to the same host from a different interface should be
4223 treated separately. */
4224
4225 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4226 if ((rs = ob->interface) && *rs)
4227 {
4228 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4229 return FALSE;
4230 pistring = string_sprintf("%s/%s", pistring, interface);
4231 }
4232
4233 /* The first time round the outer loop, check the status of the host by
4234 inspecting the retry data. The second time round, we are interested only
4235 in expired hosts that haven't been tried since this message arrived. */
4236
4237 if (cutoff_retry == 0)
4238 {
4239 BOOL incl_ip;
4240 /* Ensure the status of the address is set by checking retry data if
4241 necessary. There may be host-specific retry data (applicable to all
4242 messages) and also data for retries of a specific message at this host.
4243 If either of these retry records are actually read, the keys used are
4244 returned to save recomputing them later. */
4245
4246 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4247 US"retry_include_ip_address", ob->retry_include_ip_address,
4248 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4249 continue; /* with next host */
4250
4251 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4252 incl_ip, &retry_host_key, &retry_message_key);
4253
4254 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4255 (host->address == NULL)? US"" : host->address, pistring,
4256 (host->status == hstatus_usable)? "usable" :
4257 (host->status == hstatus_unusable)? "unusable" :
4258 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4259
4260 /* Skip this address if not usable at this time, noting if it wasn't
4261 actually expired, both locally and in the address. */
4262
4263 switch (host->status)
4264 {
4265 case hstatus_unusable:
4266 expired = FALSE;
4267 setflag(addrlist, af_retry_skipped);
4268 /* Fall through */
4269
4270 case hstatus_unusable_expired:
4271 switch (host->why)
4272 {
4273 case hwhy_retry: hosts_retry++; break;
4274 case hwhy_failed: hosts_fail++; break;
4275 case hwhy_insecure:
4276 case hwhy_deferred: hosts_defer++; break;
4277 }
4278
4279 /* If there was a retry message key, implying that previously there
4280 was a message-specific defer, we don't want to update the list of
4281 messages waiting for these hosts. */
4282
4283 if (retry_message_key) update_waiting = FALSE;
4284 continue; /* With the next host or IP address */
4285 }
4286 }
4287
4288 /* Second time round the loop: if the address is set but expired, and
4289 the message is newer than the last try, let it through. */
4290
4291 else
4292 {
4293 if ( !host->address
4294 || host->status != hstatus_unusable_expired
4295 || host->last_try > received_time.tv_sec)
4296 continue;
4297 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4298 host->name, host->address, pistring);
4299 host_is_expired = TRUE;
4300 }
4301
4302 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4303 it remains TRUE only if all hosts are expired and none are actually tried.
4304 */
4305
4306 expired = FALSE;
4307
4308 /* If this host is listed as one to which access must be serialized,
4309 see if another Exim process has a connection to it, and if so, skip
4310 this host. If not, update the database to record our connection to it
4311 and remember this for later deletion. Do not do any of this if we are
4312 sending the message down a pre-existing connection. */
4313
4314 if ( !continue_hostname
4315 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4316 {
4317 serialize_key = string_sprintf("host-serialize-%s", host->name);
4318 if (!enq_start(serialize_key, 1))
4319 {
4320 DEBUG(D_transport)
4321 debug_printf("skipping host %s because another Exim process "
4322 "is connected to it\n", host->name);
4323 hosts_serial++;
4324 continue;
4325 }
4326 }
4327
4328 /* OK, we have an IP address that is not waiting for its retry time to
4329 arrive (it might be expired) OR (second time round the loop) we have an
4330 expired host that hasn't been tried since the message arrived. Have a go
4331 at delivering the message to it. First prepare the addresses by flushing
4332 out the result of previous attempts, and finding the first address that
4333 is still to be delivered. */
4334
4335 first_addr = prepare_addresses(addrlist, host);
4336
4337 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4338 message_id, host->name, host->address, addrlist->address,
4339 addrlist->next ? ", ..." : "");
4340
4341 set_process_info("delivering %s to %s [%s] (%s%s)",
4342 message_id, host->name, host->address, addrlist->address,
4343 addrlist->next ? ", ..." : "");
4344
4345 /* This is not for real; don't do the delivery. If there are
4346 any remaining hosts, list them. */
4347
4348 if (dont_deliver)
4349 {
4350 host_item *host2;
4351 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4352 for (addr = addrlist; addr; addr = addr->next)
4353 {
4354 addr->host_used = host;
4355 addr->special_action = '*';
4356 addr->message = US"delivery bypassed by -N option";
4357 }
4358 DEBUG(D_transport)
4359 {
4360 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4361 "*** host and remaining hosts:\n", tblock->name);
4362 for (host2 = host; host2; host2 = host2->next)
4363 debug_printf(" %s [%s]\n", host2->name,
4364 host2->address ? host2->address : US"unset");
4365 }
4366 rc = OK;
4367 }
4368
4369 /* This is for real. If the host is expired, we don't count it for
4370 hosts_max_retry. This ensures that all hosts must expire before an address
4371 is timed out, unless hosts_max_try_hardlimit (which protects against
4372 lunatic DNS configurations) is reached.
4373
4374 If the host is not expired and we are about to hit the hosts_max_retry
4375 limit, check to see if there is a subsequent hosts with a different MX
4376 value. If so, make that the next host, and don't count this one. This is a
4377 heuristic to make sure that different MXs do get tried. With a normal kind
4378 of retry rule, they would get tried anyway when the earlier hosts were
4379 delayed, but if the domain has a "retry every time" type of rule - as is
4380 often used for the the very large ISPs, that won't happen. */
4381
4382 else
4383 {
4384 host_item * thost;
4385 /* Make a copy of the host if it is local to this invocation
4386 of the transport. */
4387
4388 if (expanded_hosts)
4389 {
4390 thost = store_get(sizeof(host_item));
4391 *thost = *host;
4392 thost->name = string_copy(host->name);
4393 thost->address = string_copy(host->address);
4394 }
4395 else
4396 thost = host;
4397
4398 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4399 {
4400 host_item *h;
4401 DEBUG(D_transport)
4402 debug_printf("hosts_max_try limit reached with this host\n");
4403 for (h = host; h; h = h->next) if (h->mx != host->mx)
4404 {
4405 nexthost = h;
4406 unexpired_hosts_tried--;
4407 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4408 "and will be tried\n");
4409 break;
4410 }
4411 }
4412
4413 /* Attempt the delivery. */
4414
4415 total_hosts_tried++;
4416 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4417 &message_defer, FALSE);
4418
4419 /* Yield is one of:
4420 OK => connection made, each address contains its result;
4421 message_defer is set for message-specific defers (when all
4422 recipients are marked defer)
4423 DEFER => there was a non-message-specific delivery problem;
4424 ERROR => there was a problem setting up the arguments for a filter,
4425 or there was a problem with expanding added headers
4426 */
4427
4428 /* If the result is not OK, there was a non-message-specific problem.
4429 If the result is DEFER, we need to write to the logs saying what happened
4430 for this particular host, except in the case of authentication and TLS
4431 failures, where the log has already been written. If all hosts defer a
4432 general message is written at the end. */
4433
4434 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4435 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4436 write_logs(host, first_addr->message, first_addr->basic_errno);
4437
4438 #ifndef DISABLE_EVENT
4439 if (rc == DEFER)
4440 deferred_event_raise(first_addr, host);
4441 #endif
4442
4443 /* If STARTTLS was accepted, but there was a failure in setting up the
4444 TLS session (usually a certificate screwup), and the host is not in
4445 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4446 TLS forcibly turned off. We have to start from scratch with a new SMTP
4447 connection. That's why the retry is done from here, not from within
4448 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4449 session, so the in-clear transmission after those errors, if permitted,
4450 happens inside smtp_deliver().] */
4451
4452 #ifdef SUPPORT_TLS
4453 if ( rc == DEFER
4454 && first_addr->basic_errno == ERRNO_TLSFAILURE
4455 && ob->tls_tempfail_tryclear
4456 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4457 )
4458 {
4459 log_write(0, LOG_MAIN,
4460 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4461 first_addr->message, host->name, host->address);
4462 first_addr = prepare_addresses(addrlist, host);
4463 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4464 &message_defer, TRUE);
4465 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4466 write_logs(host, first_addr->message, first_addr->basic_errno);
4467 # ifndef DISABLE_EVENT
4468 if (rc == DEFER)
4469 deferred_event_raise(first_addr, host);
4470 # endif
4471 }
4472 #endif /*SUPPORT_TLS*/
4473 }
4474
4475 /* Delivery attempt finished */
4476
4477 rs = rc == OK ? US"OK"
4478 : rc == DEFER ? US"DEFER"
4479 : rc == ERROR ? US"ERROR"
4480 : US"?";
4481
4482 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4483 message_id, host->name, host->address, addrlist->address,
4484 addrlist->next ? " (& others)" : "", rs);
4485
4486 /* Release serialization if set up */
4487
4488 if (serialize_key) enq_end(serialize_key);
4489
4490 /* If the result is DEFER, or if a host retry record is known to exist, we
4491 need to add an item to the retry chain for updating the retry database
4492 at the end of delivery. We only need to add the item to the top address,
4493 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4494 for any other delivery attempts using the same address. (It is copied into
4495 the unusable tree at the outer level, so even if different address blocks
4496 contain the same address, it still won't get tried again.) */
4497
4498 if (rc == DEFER || retry_host_key)
4499 {
4500 int delete_flag = rc != DEFER ? rf_delete : 0;
4501 if (!retry_host_key)
4502 {
4503 BOOL incl_ip;
4504 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4505 US"retry_include_ip_address", ob->retry_include_ip_address,
4506 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4507 incl_ip = TRUE; /* error; use most-specific retry record */
4508
4509 retry_host_key = incl_ip
4510 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4511 : string_sprintf("T:%S%s", host->name, pistring);
4512 }
4513
4514 /* If a delivery of another message over an existing SMTP connection
4515 yields DEFER, we do NOT set up retry data for the host. This covers the
4516 case when there are delays in routing the addresses in the second message
4517 that are so long that the server times out. This is alleviated by not
4518 routing addresses that previously had routing defers when handling an
4519 existing connection, but even so, this case may occur (e.g. if a
4520 previously happily routed address starts giving routing defers). If the
4521 host is genuinely down, another non-continued message delivery will
4522 notice it soon enough. */
4523
4524 if (delete_flag != 0 || !continue_hostname)
4525 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4526
4527 /* We may have tried an expired host, if its retry time has come; ensure
4528 the status reflects the expiry for the benefit of any other addresses. */
4529
4530 if (rc == DEFER)
4531 {
4532 host->status = host_is_expired
4533 ? hstatus_unusable_expired : hstatus_unusable;
4534 host->why = hwhy_deferred;
4535 }
4536 }
4537
4538 /* If message_defer is set (host was OK, but every recipient got deferred
4539 because of some message-specific problem), or if that had happened
4540 previously so that a message retry key exists, add an appropriate item
4541 to the retry chain. Note that if there was a message defer but now there is
4542 a host defer, the message defer record gets deleted. That seems perfectly
4543 reasonable. Also, stop the message from being remembered as waiting
4544 for specific hosts. */
4545
4546 if (message_defer || retry_message_key)
4547 {
4548 int delete_flag = message_defer ? 0 : rf_delete;
4549 if (!retry_message_key)
4550 {
4551 BOOL incl_ip;
4552 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4553 US"retry_include_ip_address", ob->retry_include_ip_address,
4554 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4555 incl_ip = TRUE; /* error; use most-specific retry record */
4556
4557 retry_message_key = incl_ip
4558 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4559 message_id)
4560 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4561 }
4562 retry_add_item(addrlist, retry_message_key,
4563 rf_message | rf_host | delete_flag);
4564 update_waiting = FALSE;
4565 }
4566
4567 /* Any return other than DEFER (that is, OK or ERROR) means that the
4568 addresses have got their final statuses filled in for this host. In the OK
4569 case, see if any of them are deferred. */
4570
4571 if (rc == OK)
4572 for (addr = addrlist; addr; addr = addr->next)
4573 if (addr->transport_return == DEFER)
4574 {
4575 some_deferred = TRUE;
4576 break;
4577 }
4578
4579 /* If no addresses deferred or the result was ERROR, return. We do this for
4580 ERROR because a failing filter set-up or add_headers expansion is likely to
4581 fail for any host we try. */
4582
4583 if (rc == ERROR || (rc == OK && !some_deferred))
4584 {
4585 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4586 return TRUE; /* Each address has its status */
4587 }
4588
4589 /* If the result was DEFER or some individual addresses deferred, let
4590 the loop run to try other hosts with the deferred addresses, except for the
4591 case when we were trying to deliver down an existing channel and failed.
4592 Don't try any other hosts in this case. */
4593
4594 if (continue_hostname) break;
4595
4596 /* If the whole delivery, or some individual addresses, were deferred and
4597 there are more hosts that could be tried, do not count this host towards
4598 the hosts_max_try limit if the age of the message is greater than the
4599 maximum retry time for this host. This means we may try try all hosts,
4600 ignoring the limit, when messages have been around for some time. This is
4601 important because if we don't try all hosts, the address will never time
4602 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4603
4604 if ((rc == DEFER || some_deferred) && nexthost)
4605 {
4606 BOOL timedout;
4607 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4608
4609 if (retry && retry->rules)
4610 {
4611 retry_rule *last_rule;
4612 for (last_rule = retry->rules;
4613 last_rule->next;
4614 last_rule = last_rule->next);
4615 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4616 }
4617 else timedout = TRUE; /* No rule => timed out */
4618
4619 if (timedout)
4620 {
4621 unexpired_hosts_tried--;
4622 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4623 "hosts_max_try (message older than host's retry time)\n");
4624 }
4625 }
4626 } /* End of loop for trying multiple hosts. */
4627
4628 /* If we failed to find a matching host in the list, for an already-open
4629 connection, just close it and start over with the list. This can happen
4630 for routing that changes from run to run, or big multi-IP sites with
4631 round-robin DNS. */
4632
4633 if (continue_hostname && !continue_host_tried)
4634 {
4635 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
4636
4637 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4638 #ifdef SUPPORT_TLS
4639 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
4640 transport */
4641 /*XXX doublecheck that! */
4642
4643 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
4644 {
4645 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
4646 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4647 cutthrough.cctx.tls_ctx = NULL;
4648 cutthrough.is_tls = FALSE;
4649 }
4650 else
4651 #else
4652 (void) write(fd, US"QUIT\r\n", 6);
4653 #endif
4654 (void) close(fd);
4655 cutthrough.cctx.sock = -1;
4656 continue_hostname = NULL;
4657 goto retry_non_continued;
4658 }
4659
4660 /* This is the end of the loop that repeats iff expired is TRUE and
4661 ob->delay_after_cutoff is FALSE. The second time round we will
4662 try those hosts that haven't been tried since the message arrived. */
4663
4664 DEBUG(D_transport)
4665 {
4666 debug_printf("all IP addresses skipped or deferred at least one address\n");
4667 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4668 debug_printf("retrying IP addresses not tried since message arrived\n");
4669 }
4670 }
4671
4672
4673 /* Get here if all IP addresses are skipped or defer at least one address. In
4674 MUA wrapper mode, this will happen only for connection or other non-message-
4675 specific failures. Force the delivery status for all addresses to FAIL. */
4676
4677 if (mua_wrapper)
4678 {
4679 for (addr = addrlist; addr; addr = addr->next)
4680 addr->transport_return = FAIL;
4681 goto END_TRANSPORT;
4682 }
4683
4684 /* In the normal, non-wrapper case, add a standard message to each deferred
4685 address if there hasn't been an error, that is, if it hasn't actually been
4686 tried this time. The variable "expired" will be FALSE if any deliveries were
4687 actually tried, or if there was at least one host that was not expired. That
4688 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4689 a delivery has been tried, an error code will be set, and the failing of the
4690 message is handled by the retry code later.
4691
4692 If queue_smtp is set, or this transport was called to send a subsequent message
4693 down an existing TCP/IP connection, and something caused the host not to be
4694 found, we end up here, but can detect these cases and handle them specially. */
4695
4696 for (addr = addrlist; addr; addr = addr->next)
4697 {
4698 /* If host is not NULL, it means that we stopped processing the host list
4699 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4700 means we need to behave as if some hosts were skipped because their retry
4701 time had not come. Specifically, this prevents the address from timing out.
4702 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4703 hosts were tried. */
4704
4705 if (host)
4706 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4707 {
4708 DEBUG(D_transport)
4709 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4710 "hosts were tried\n");
4711 }
4712 else
4713 {
4714 DEBUG(D_transport)
4715 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4716 setflag(addr, af_retry_skipped);
4717 }
4718
4719 if (queue_smtp) /* no deliveries attempted */
4720 {
4721 addr->transport_return = DEFER;
4722 addr->basic_errno = 0;
4723 addr->message = US"SMTP delivery explicitly queued";
4724 }
4725
4726 else if ( addr->transport_return == DEFER
4727 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4728 && !addr->message
4729 )
4730 {
4731 addr->basic_errno = ERRNO_HRETRY;
4732 if (continue_hostname)
4733 addr->message = US"no host found for existing SMTP connection";
4734 else if (expired)
4735 {
4736 setflag(addr, af_pass_message); /* This is not a security risk */
4737 addr->message = string_sprintf(
4738 "all hosts%s have been failing for a long time %s",
4739 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4740 ob->delay_after_cutoff
4741 ? US"(and retry time not reached)"
4742 : US"and were last tried after this message arrived");
4743
4744 /* If we are already using fallback hosts, or there are no fallback hosts
4745 defined, convert the result to FAIL to cause a bounce. */
4746
4747 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4748 addr->transport_return = FAIL;
4749 }
4750 else
4751 {
4752 const char * s;
4753 if (hosts_retry == hosts_total)
4754 s = "retry time not reached for any host%s";
4755 else if (hosts_fail == hosts_total)
4756 s = "all host address lookups%s failed permanently";
4757 else if (hosts_defer == hosts_total)
4758 s = "all host address lookups%s failed temporarily";
4759 else if (hosts_serial == hosts_total)
4760 s = "connection limit reached for all hosts%s";
4761 else if (hosts_fail+hosts_defer == hosts_total)
4762 s = "all host address lookups%s failed";
4763 else
4764 s = "some host address lookups failed and retry time "
4765 "not reached for other hosts or connection limit reached%s";
4766
4767 addr->message = string_sprintf(s,
4768 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4769 }
4770 }
4771 }
4772
4773 /* Update the database which keeps information about which messages are waiting
4774 for which hosts to become available. For some message-specific errors, the
4775 update_waiting flag is turned off because we don't want follow-on deliveries in
4776 those cases. If this transport instance is explicitly limited to one message
4777 per connection then follow-on deliveries are not possible and there's no need
4778 to create/update the per-transport wait-<transport_name> database. */
4779
4780 if (update_waiting && tblock->connection_max_messages != 1)
4781 transport_update_waiting(hostlist, tblock->name);
4782
4783 END_TRANSPORT:
4784
4785 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4786
4787 return TRUE; /* Each address has its status */
4788 }
4789
4790 #endif /*!MACRO_PREDEF*/
4791 /* vi: aw ai sw=2
4792 */
4793 /* End of transport/smtp.c */
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