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Testsuite: track newer GnuTLS behaviour
[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 #ifdef SUPPORT_I18N
196 { "utf8_downconvert", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
198 #endif
199 };
200
201 /* Size of the options list. An extern variable has to be used so that its
202 address can appear in the tables drtables.c. */
203
204 int smtp_transport_options_count = nelem(smtp_transport_options);
205
206
207 #ifdef MACRO_PREDEF
208
209 /* Dummy values */
210 smtp_transport_options_block smtp_transport_option_defaults = {0};
211 void smtp_transport_init(transport_instance *tblock) {}
212 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
213 void smtp_transport_closedown(transport_instance *tblock) {}
214
215 #else /*!MACRO_PREDEF*/
216
217
218 /* Default private options block for the smtp transport. */
219
220 smtp_transport_options_block smtp_transport_option_defaults = {
221 .hosts = NULL,
222 .fallback_hosts = NULL,
223 .hostlist = NULL,
224 .fallback_hostlist = NULL,
225 .helo_data = US"$primary_hostname",
226 .interface = NULL,
227 .port = NULL,
228 .protocol = US"smtp",
229 .dscp = NULL,
230 .serialize_hosts = NULL,
231 .hosts_try_auth = NULL,
232 .hosts_require_auth = NULL,
233 .hosts_try_chunking = US"*",
234 #ifdef SUPPORT_DANE
235 .hosts_try_dane = NULL,
236 .hosts_require_dane = NULL,
237 .dane_require_tls_ciphers = NULL,
238 #endif
239 .hosts_try_fastopen = NULL,
240 #ifndef DISABLE_PRDR
241 .hosts_try_prdr = US"*",
242 #endif
243 #ifndef DISABLE_OCSP
244 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
245 .hosts_require_ocsp = NULL,
246 #endif
247 .hosts_require_tls = NULL,
248 .hosts_avoid_tls = NULL,
249 .hosts_verify_avoid_tls = NULL,
250 .hosts_avoid_pipelining = NULL,
251 .hosts_avoid_esmtp = NULL,
252 #ifdef SUPPORT_TLS
253 .hosts_nopass_tls = NULL,
254 .hosts_noproxy_tls = US"*",
255 #endif
256 .command_timeout = 5*60,
257 .connect_timeout = 5*60,
258 .data_timeout = 5*60,
259 .final_timeout = 10*60,
260 .size_addition = 1024,
261 .hosts_max_try = 5,
262 .hosts_max_try_hardlimit = 50,
263 .address_retry_include_sender = TRUE,
264 .allow_localhost = FALSE,
265 .authenticated_sender_force = FALSE,
266 .gethostbyname = FALSE,
267 .dns_qualify_single = TRUE,
268 .dns_search_parents = FALSE,
269 .dnssec = { .request=NULL, .require=NULL },
270 .delay_after_cutoff = TRUE,
271 .hosts_override = FALSE,
272 .hosts_randomize = FALSE,
273 .keepalive = TRUE,
274 .lmtp_ignore_quota = FALSE,
275 .expand_retry_include_ip_address = NULL,
276 .retry_include_ip_address = TRUE,
277 #ifdef SUPPORT_SOCKS
278 .socks_proxy = NULL,
279 #endif
280 #ifdef SUPPORT_TLS
281 .tls_certificate = NULL,
282 .tls_crl = NULL,
283 .tls_privatekey = NULL,
284 .tls_require_ciphers = NULL,
285 .tls_sni = NULL,
286 .tls_verify_certificates = US"system",
287 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
288 .tls_tempfail_tryclear = TRUE,
289 .tls_verify_hosts = NULL,
290 .tls_try_verify_hosts = US"*",
291 .tls_verify_cert_hostnames = US"*",
292 #endif
293 #ifdef SUPPORT_I18N
294 .utf8_downconvert = NULL,
295 #endif
296 #ifndef DISABLE_DKIM
297 .dkim =
298 {.dkim_domain = NULL,
299 .dkim_identity = NULL,
300 .dkim_private_key = NULL,
301 .dkim_selector = NULL,
302 .dkim_canon = NULL,
303 .dkim_sign_headers = NULL,
304 .dkim_strict = NULL,
305 .dkim_hash = US"sha256",
306 .dkim_timestamps = NULL,
307 .dot_stuffed = FALSE,
308 .force_bodyhash = FALSE,
309 # ifdef EXPERIMENTAL_ARC
310 .arc_signspec = NULL,
311 # endif
312 },
313 # ifdef EXPERIMENTAL_ARC
314 .arc_sign = NULL,
315 # endif
316 #endif
317 };
318
319 /* some DSN flags for use later */
320
321 static int rf_list[] = {rf_notify_never, rf_notify_success,
322 rf_notify_failure, rf_notify_delay };
323
324 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
325
326
327
328 /* Local statics */
329
330 static uschar *smtp_command; /* Points to last cmd for error messages */
331 static uschar *mail_command; /* Points to MAIL cmd for error messages */
332 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
333 static BOOL update_waiting; /* TRUE to update the "wait" database */
334
335 /*XXX move to smtp_context */
336 static BOOL pipelining_active; /* current transaction is in pipe mode */
337
338
339 /*************************************************
340 * Setup entry point *
341 *************************************************/
342
343 /* This function is called when the transport is about to be used,
344 but before running it in a sub-process. It is used for two things:
345
346 (1) To set the fallback host list in addresses, when delivering.
347 (2) To pass back the interface, port, protocol, and other options, for use
348 during callout verification.
349
350 Arguments:
351 tblock pointer to the transport instance block
352 addrlist list of addresses about to be transported
353 tf if not NULL, pointer to block in which to return options
354 uid the uid that will be set (not used)
355 gid the gid that will be set (not used)
356 errmsg place for error message (not used)
357
358 Returns: OK always (FAIL, DEFER not used)
359 */
360
361 static int
362 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
363 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
364 {
365 smtp_transport_options_block *ob =
366 (smtp_transport_options_block *)(tblock->options_block);
367
368 errmsg = errmsg; /* Keep picky compilers happy */
369 uid = uid;
370 gid = gid;
371
372 /* Pass back options if required. This interface is getting very messy. */
373
374 if (tf)
375 {
376 tf->interface = ob->interface;
377 tf->port = ob->port;
378 tf->protocol = ob->protocol;
379 tf->hosts = ob->hosts;
380 tf->hosts_override = ob->hosts_override;
381 tf->hosts_randomize = ob->hosts_randomize;
382 tf->gethostbyname = ob->gethostbyname;
383 tf->qualify_single = ob->dns_qualify_single;
384 tf->search_parents = ob->dns_search_parents;
385 tf->helo_data = ob->helo_data;
386 }
387
388 /* Set the fallback host list for all the addresses that don't have fallback
389 host lists, provided that the local host wasn't present in the original host
390 list. */
391
392 if (!testflag(addrlist, af_local_host_removed))
393 for (; addrlist; addrlist = addrlist->next)
394 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
395
396 return OK;
397 }
398
399
400
401 /*************************************************
402 * Initialization entry point *
403 *************************************************/
404
405 /* Called for each instance, after its options have been read, to
406 enable consistency checks to be done, or anything else that needs
407 to be set up.
408
409 Argument: pointer to the transport instance block
410 Returns: nothing
411 */
412
413 void
414 smtp_transport_init(transport_instance *tblock)
415 {
416 smtp_transport_options_block *ob =
417 (smtp_transport_options_block *)(tblock->options_block);
418
419 /* Retry_use_local_part defaults FALSE if unset */
420
421 if (tblock->retry_use_local_part == TRUE_UNSET)
422 tblock->retry_use_local_part = FALSE;
423
424 /* Set the default port according to the protocol */
425
426 if (ob->port == NULL)
427 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
428 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
429
430 /* Set up the setup entry point, to be called before subprocesses for this
431 transport. */
432
433 tblock->setup = smtp_transport_setup;
434
435 /* Complain if any of the timeouts are zero. */
436
437 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
438 ob->final_timeout <= 0)
439 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
440 "command, data, or final timeout value is zero for %s transport",
441 tblock->name);
442
443 /* If hosts_override is set and there are local hosts, set the global
444 flag that stops verify from showing router hosts. */
445
446 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
447
448 /* If there are any fallback hosts listed, build a chain of host items
449 for them, but do not do any lookups at this time. */
450
451 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
452 }
453
454
455
456
457
458 /*************************************************
459 * Set delivery info into all active addresses *
460 *************************************************/
461
462 /* Only addresses whose status is >= PENDING are relevant. A lesser
463 status means that an address is not currently being processed.
464
465 Arguments:
466 addrlist points to a chain of addresses
467 errno_value to put in each address's errno field
468 msg to put in each address's message field
469 rc to put in each address's transport_return field
470 pass_message if TRUE, set the "pass message" flag in the address
471 host if set, mark addrs as having used this host
472 smtp_greeting from peer
473 helo_response from peer
474
475 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
476 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
477 this particular type of timeout.
478
479 Returns: nothing
480 */
481
482 static void
483 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
484 BOOL pass_message, host_item * host
485 #ifdef EXPERIMENTAL_DSN_INFO
486 , const uschar * smtp_greeting, const uschar * helo_response
487 #endif
488 )
489 {
490 address_item *addr;
491 int orvalue = 0;
492 if (errno_value == ERRNO_CONNECTTIMEOUT)
493 {
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
496 }
497 for (addr = addrlist; addr; addr = addr->next)
498 if (addr->transport_return >= PENDING)
499 {
500 addr->basic_errno = errno_value;
501 addr->more_errno |= orvalue;
502 if (msg)
503 {
504 addr->message = msg;
505 if (pass_message) setflag(addr, af_pass_message);
506 }
507 addr->transport_return = rc;
508 if (host)
509 {
510 addr->host_used = host;
511 #ifdef EXPERIMENTAL_DSN_INFO
512 if (smtp_greeting)
513 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
514 addr->smtp_greeting = smtp_greeting;
515
516 if (helo_response)
517 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
518 addr->helo_response = helo_response;
519 #endif
520 }
521 }
522 }
523
524 static void
525 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
526 BOOL pass_message)
527 {
528 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
529 #ifdef EXPERIMENTAL_DSN_INFO
530 , NULL, NULL
531 #endif
532 );
533 }
534
535
536 /*************************************************
537 * Check an SMTP response *
538 *************************************************/
539
540 /* This function is given an errno code and the SMTP response buffer
541 to analyse, together with the host identification for generating messages. It
542 sets an appropriate message and puts the first digit of the response code into
543 the yield variable. If no response was actually read, a suitable digit is
544 chosen.
545
546 Arguments:
547 host the current host, to get its name for messages
548 errno_value pointer to the errno value
549 more_errno from the top address for use with ERRNO_FILTER_FAIL
550 buffer the SMTP response buffer
551 yield where to put a one-digit SMTP response code
552 message where to put an error message
553 pass_message set TRUE if message is an SMTP response
554
555 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
556 */
557
558 static BOOL
559 check_response(host_item *host, int *errno_value, int more_errno,
560 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
561 {
562 uschar * pl = pipelining_active ? US"pipelined " : US"";
563 const uschar * s;
564
565 *yield = '4'; /* Default setting is to give a temporary error */
566
567 switch(*errno_value)
568 {
569 case ETIMEDOUT: /* Handle response timeout */
570 *message = US string_sprintf("SMTP timeout after %s%s",
571 pl, smtp_command);
572 if (transport_count > 0)
573 *message = US string_sprintf("%s (%d bytes written)", *message,
574 transport_count);
575 return FALSE;
576
577 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
578 s = string_printing(buffer);
579 while (isspace(*s)) s++;
580 *message = *s == 0
581 ? string_sprintf("Malformed SMTP reply (an empty line) "
582 "in response to %s%s", pl, smtp_command)
583 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
584 pl, smtp_command, s);
585 return FALSE;
586
587 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
588 can't send QUIT as we mustn't end the DATA. */
589 *message = string_sprintf("transport filter process failed (%d)%s",
590 more_errno,
591 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
592 return FALSE;
593
594 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
595 can't send QUIT as we mustn't end the DATA. */
596 *message =
597 string_sprintf("failed to expand headers_add or headers_remove: %s",
598 expand_string_message);
599 return FALSE;
600
601 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
602 *message = string_sprintf("failed to write a data block");
603 return FALSE;
604
605 #ifdef SUPPORT_I18N
606 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
607 *message = US"utf8 support required but not offered for forwarding";
608 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
609 return TRUE;
610 #endif
611 }
612
613 /* Handle error responses from the remote mailer. */
614
615 if (buffer[0] != 0)
616 {
617 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
618 "%s", pl, smtp_command, s = string_printing(buffer));
619 *pass_message = TRUE;
620 *yield = buffer[0];
621 return TRUE;
622 }
623
624 /* No data was read. If there is no errno, this must be the EOF (i.e.
625 connection closed) case, which causes deferral. An explicit connection reset
626 error has the same effect. Otherwise, put the host's identity in the message,
627 leaving the errno value to be interpreted as well. In all cases, we have to
628 assume the connection is now dead. */
629
630 if (*errno_value == 0 || *errno_value == ECONNRESET)
631 {
632 *errno_value = ERRNO_SMTPCLOSED;
633 *message = US string_sprintf("Remote host closed connection "
634 "in response to %s%s", pl, smtp_command);
635 }
636 else
637 *message = US string_sprintf("%s [%s]", host->name, host->address);
638
639 return FALSE;
640 }
641
642
643
644 /*************************************************
645 * Write error message to logs *
646 *************************************************/
647
648 /* This writes to the main log and to the message log.
649
650 Arguments:
651 host the current host
652 detail the current message (addr_item->message)
653 basic_errno the errno (addr_item->basic_errno)
654
655 Returns: nothing
656 */
657
658 static void
659 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
660 {
661
662
663 uschar *message = LOGGING(outgoing_port)
664 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
665 host->port == PORT_NONE ? 25 : host->port)
666 : string_sprintf("H=%s [%s]", host->name, host->address);
667
668 if (suffix)
669 {
670 message = string_sprintf("%s: %s", message, suffix);
671 if (basic_errno > 0)
672 message = string_sprintf("%s: %s", message, strerror(basic_errno));
673 }
674 else
675 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
676
677 log_write(0, LOG_MAIN, "%s", message);
678 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
679 }
680
681 static void
682 msglog_line(host_item * host, uschar * message)
683 {
684 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
685 host->name, host->address, message);
686 }
687
688
689
690 #ifndef DISABLE_EVENT
691 /*************************************************
692 * Post-defer action *
693 *************************************************/
694
695 /* This expands an arbitrary per-transport string.
696 It might, for example, be used to write to the database log.
697
698 Arguments:
699 addr the address item containing error information
700 host the current host
701
702 Returns: nothing
703 */
704
705 static void
706 deferred_event_raise(address_item *addr, host_item *host)
707 {
708 uschar * action = addr->transport->event_action;
709 const uschar * save_domain;
710 uschar * save_local;
711
712 if (!action)
713 return;
714
715 save_domain = deliver_domain;
716 save_local = deliver_localpart;
717
718 /*XXX would ip & port already be set up? */
719 deliver_host_address = string_copy(host->address);
720 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
721 event_defer_errno = addr->basic_errno;
722
723 router_name = addr->router->name;
724 transport_name = addr->transport->name;
725 deliver_domain = addr->domain;
726 deliver_localpart = addr->local_part;
727
728 (void) event_raise(action, US"msg:host:defer",
729 addr->message
730 ? addr->basic_errno > 0
731 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
732 : string_copy(addr->message)
733 : addr->basic_errno > 0
734 ? string_copy(US strerror(addr->basic_errno))
735 : NULL);
736
737 deliver_localpart = save_local;
738 deliver_domain = save_domain;
739 router_name = transport_name = NULL;
740 }
741 #endif
742
743 /*************************************************
744 * Synchronize SMTP responses *
745 *************************************************/
746
747 /* This function is called from smtp_deliver() to receive SMTP responses from
748 the server, and match them up with the commands to which they relate. When
749 PIPELINING is not in use, this function is called after every command, and is
750 therefore somewhat over-engineered, but it is simpler to use a single scheme
751 that works both with and without PIPELINING instead of having two separate sets
752 of code.
753
754 The set of commands that are buffered up with pipelining may start with MAIL
755 and may end with DATA; in between are RCPT commands that correspond to the
756 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
757 etc.) are never buffered.
758
759 Errors after MAIL or DATA abort the whole process leaving the response in the
760 buffer. After MAIL, pending responses are flushed, and the original command is
761 re-instated in big_buffer for error messages. For RCPT commands, the remote is
762 permitted to reject some recipient addresses while accepting others. However
763 certain errors clearly abort the whole process. Set the value in
764 transport_return to PENDING_OK if the address is accepted. If there is a
765 subsequent general error, it will get reset accordingly. If not, it will get
766 converted to OK at the end.
767
768 Arguments:
769 sx smtp connection context
770 count the number of responses to read
771 pending_DATA 0 if last command sent was not DATA
772 +1 if previously had a good recipient
773 -1 if not previously had a good recipient
774
775 Returns: 3 if at least one address had 2xx and one had 5xx
776 2 if at least one address had 5xx but none had 2xx
777 1 if at least one host had a 2xx response, but none had 5xx
778 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
779 -1 timeout while reading RCPT response
780 -2 I/O or other non-response error for RCPT
781 -3 DATA or MAIL failed - errno and buffer set
782 */
783
784 static int
785 sync_responses(smtp_context * sx, int count, int pending_DATA)
786 {
787 address_item *addr = sx->sync_addr;
788 smtp_transport_options_block *ob =
789 (smtp_transport_options_block *)sx->tblock->options_block;
790 int yield = 0;
791
792 /* Handle the response for a MAIL command. On error, reinstate the original
793 command in big_buffer for error message use, and flush any further pending
794 responses before returning, except after I/O errors and timeouts. */
795
796 if (sx->pending_MAIL)
797 {
798 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
799 count--;
800 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
801 '2', ob->command_timeout))
802 {
803 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
804 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
805 if (errno == 0 && sx->buffer[0] != 0)
806 {
807 uschar flushbuffer[4096];
808 int save_errno = 0;
809 if (sx->buffer[0] == '4')
810 {
811 save_errno = ERRNO_MAIL4XX;
812 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
813 }
814 while (count-- > 0)
815 {
816 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
817 '2', ob->command_timeout)
818 && (errno != 0 || flushbuffer[0] == 0))
819 break;
820 }
821 errno = save_errno;
822 }
823
824 if (pending_DATA) count--; /* Number of RCPT responses to come */
825 while (count-- > 0) /* Mark any pending addrs with the host used */
826 {
827 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
828 addr->host_used = sx->host;
829 addr = addr->next;
830 }
831 return -3;
832 }
833 }
834
835 if (pending_DATA) count--; /* Number of RCPT responses to come */
836
837 /* Read and handle the required number of RCPT responses, matching each one up
838 with an address by scanning for the next address whose status is PENDING_DEFER.
839 */
840
841 while (count-- > 0)
842 {
843 while (addr->transport_return != PENDING_DEFER)
844 if (!(addr = addr->next))
845 return -2;
846
847 /* The address was accepted */
848 addr->host_used = sx->host;
849
850 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
851 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
852 '2', ob->command_timeout))
853 {
854 yield |= 1;
855 addr->transport_return = PENDING_OK;
856
857 /* If af_dr_retry_exists is set, there was a routing delay on this address;
858 ensure that any address-specific retry record is expunged. We do this both
859 for the basic key and for the version that also includes the sender. */
860
861 if (testflag(addr, af_dr_retry_exists))
862 {
863 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
864 sender_address);
865 retry_add_item(addr, altkey, rf_delete);
866 retry_add_item(addr, addr->address_retry_key, rf_delete);
867 }
868 }
869
870 /* Timeout while reading the response */
871
872 else if (errno == ETIMEDOUT)
873 {
874 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
875 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
876 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
877 retry_add_item(addr, addr->address_retry_key, 0);
878 update_waiting = FALSE;
879 return -1;
880 }
881
882 /* Handle other errors in obtaining an SMTP response by returning -1. This
883 will cause all the addresses to be deferred. Restore the SMTP command in
884 big_buffer for which we are checking the response, so the error message
885 makes sense. */
886
887 else if (errno != 0 || sx->buffer[0] == 0)
888 {
889 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
890 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
891 return -2;
892 }
893
894 /* Handle SMTP permanent and temporary response codes. */
895
896 else
897 {
898 addr->message =
899 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
900 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
901 string_printing(sx->buffer));
902 setflag(addr, af_pass_message);
903 if (!sx->verify)
904 msglog_line(sx->host, addr->message);
905
906 /* The response was 5xx */
907
908 if (sx->buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
921
922 if (!sx->verify)
923 {
924 #ifndef DISABLE_EVENT
925 event_defer_errno = addr->more_errno;
926 msg_event_raise(US"msg:rcpt:host:defer", addr);
927 #endif
928
929 /* Log temporary errors if there are more hosts to be tried.
930 If not, log this last one in the == line. */
931
932 if (sx->host->next)
933 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
934 sx->host->name, sx->host->address, addr->message);
935
936 #ifndef DISABLE_EVENT
937 else
938 msg_event_raise(US"msg:rcpt:defer", addr);
939 #endif
940
941 /* Do not put this message on the list of those waiting for specific
942 hosts, as otherwise it is likely to be tried too often. */
943
944 update_waiting = FALSE;
945
946 /* Add a retry item for the address so that it doesn't get tried again
947 too soon. If address_retry_include_sender is true, add the sender address
948 to the retry key. */
949
950 retry_add_item(addr,
951 ob->address_retry_include_sender
952 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
953 : addr->address_retry_key,
954 0);
955 }
956 }
957 }
958 } /* Loop for next RCPT response */
959
960 /* Update where to start at for the next block of responses, unless we
961 have already handled all the addresses. */
962
963 if (addr) sx->sync_addr = addr->next;
964
965 /* Handle a response to DATA. If we have not had any good recipients, either
966 previously or in this block, the response is ignored. */
967
968 if (pending_DATA != 0)
969 {
970 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
971 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
972 '3', ob->command_timeout))
973 {
974 int code;
975 uschar *msg;
976 BOOL pass_message;
977 if (pending_DATA > 0 || (yield & 1) != 0)
978 {
979 if (errno == 0 && sx->buffer[0] == '4')
980 {
981 errno = ERRNO_DATA4XX;
982 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
983 }
984 return -3;
985 }
986 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
987 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
988 "is in use and there were no good recipients\n", msg);
989 }
990 }
991
992 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
993 present) received 3xx. If any RCPTs were handled and yielded anything other
994 than 4xx, yield will be set non-zero. */
995
996 return yield;
997 }
998
999
1000
1001 /* Do the client side of smtp-level authentication */
1002 /*
1003 Arguments:
1004 sx smtp connection
1005 buffer EHLO response from server (gets overwritten)
1006
1007 Returns:
1008 OK Success, or failed (but not required): global "smtp_authenticated" set
1009 DEFER Failed authentication (and was required)
1010 ERROR Internal problem
1011
1012 FAIL_SEND Failed communications - transmit
1013 FAIL - response
1014 */
1015
1016 static int
1017 smtp_auth(smtp_context * sx, uschar * buffer, unsigned bufsize)
1018 {
1019 smtp_transport_options_block * ob = sx->ob;
1020 int require_auth;
1021 uschar *fail_reason = US"server did not advertise AUTH support";
1022
1023 f.smtp_authenticated = FALSE;
1024 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1025 require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, sx->host);
1026
1027 if (sx->esmtp && !regex_AUTH) regex_AUTH =
1028 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1029 FALSE, TRUE);
1030
1031 if (sx->esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1032 {
1033 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1034 expand_nmax = -1; /* reset */
1035
1036 /* Must not do this check until after we have saved the result of the
1037 regex match above. */
1038
1039 if (require_auth == OK ||
1040 verify_check_given_host(CUSS &ob->hosts_try_auth, sx->host) == OK)
1041 {
1042 auth_instance *au;
1043 fail_reason = US"no common mechanisms were found";
1044
1045 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1046
1047 /* Scan the configured authenticators looking for one which is configured
1048 for use as a client, which is not suppressed by client_condition, and
1049 whose name matches an authentication mechanism supported by the server.
1050 If one is found, attempt to authenticate by calling its client function.
1051 */
1052
1053 for (au = auths; !f.smtp_authenticated && au; au = au->next)
1054 {
1055 uschar *p = names;
1056 if (!au->client ||
1057 (au->client_condition != NULL &&
1058 !expand_check_condition(au->client_condition, au->name,
1059 US"client authenticator")))
1060 {
1061 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1062 au->name,
1063 (au->client)? "client_condition is false" :
1064 "not configured as a client");
1065 continue;
1066 }
1067
1068 /* Loop to scan supported server mechanisms */
1069
1070 while (*p)
1071 {
1072 int rc;
1073 int len = Ustrlen(au->public_name);
1074 while (isspace(*p)) p++;
1075
1076 if (strncmpic(au->public_name, p, len) != 0 ||
1077 (p[len] != 0 && !isspace(p[len])))
1078 {
1079 while (*p != 0 && !isspace(*p)) p++;
1080 continue;
1081 }
1082
1083 /* Found data for a listed mechanism. Call its client entry. Set
1084 a flag in the outblock so that data is overwritten after sending so
1085 that reflections don't show it. */
1086
1087 fail_reason = US"authentication attempt(s) failed";
1088 sx->outblock.authenticating = TRUE;
1089 rc = (au->info->clientcode)(au, sx,
1090 ob->command_timeout, buffer, bufsize);
1091 sx->outblock.authenticating = FALSE;
1092 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1093 au->name, rc);
1094
1095 /* A temporary authentication failure must hold up delivery to
1096 this host. After a permanent authentication failure, we carry on
1097 to try other authentication methods. If all fail hard, try to
1098 deliver the message unauthenticated unless require_auth was set. */
1099
1100 switch(rc)
1101 {
1102 case OK:
1103 f.smtp_authenticated = TRUE; /* stops the outer loop */
1104 client_authenticator = au->name;
1105 if (au->set_client_id != NULL)
1106 client_authenticated_id = expand_string(au->set_client_id);
1107 break;
1108
1109 /* Failure after writing a command */
1110
1111 case FAIL_SEND:
1112 return FAIL_SEND;
1113
1114 /* Failure after reading a response */
1115
1116 case FAIL:
1117 if (errno != 0 || buffer[0] != '5') return FAIL;
1118 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1119 au->name, sx->host->name, sx->host->address, buffer);
1120 break;
1121
1122 /* Failure by some other means. In effect, the authenticator
1123 decided it wasn't prepared to handle this case. Typically this
1124 is the result of "fail" in an expansion string. Do we need to
1125 log anything here? Feb 2006: a message is now put in the buffer
1126 if logging is required. */
1127
1128 case CANCELLED:
1129 if (*buffer != 0)
1130 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1131 "authentication H=%s [%s] %s", au->name, sx->host->name,
1132 sx->host->address, buffer);
1133 break;
1134
1135 /* Internal problem, message in buffer. */
1136
1137 case ERROR:
1138 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1139 DEFER, FALSE);
1140 return ERROR;
1141 }
1142
1143 break; /* If not authenticated, try next authenticator */
1144 } /* Loop for scanning supported server mechanisms */
1145 } /* Loop for further authenticators */
1146 }
1147 }
1148
1149 /* If we haven't authenticated, but are required to, give up. */
1150
1151 if (require_auth == OK && !f.smtp_authenticated)
1152 {
1153 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1154 string_sprintf("authentication required but %s", fail_reason), DEFER,
1155 FALSE);
1156 return DEFER;
1157 }
1158
1159 return OK;
1160 }
1161
1162
1163 /* Construct AUTH appendix string for MAIL TO */
1164 /*
1165 Arguments
1166 buffer to build string
1167 addrlist chain of potential addresses to deliver
1168 ob transport options
1169
1170 Globals f.smtp_authenticated
1171 client_authenticated_sender
1172 Return True on error, otherwise buffer has (possibly empty) terminated string
1173 */
1174
1175 BOOL
1176 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1177 smtp_transport_options_block *ob)
1178 {
1179 uschar *local_authenticated_sender = authenticated_sender;
1180
1181 #ifdef notdef
1182 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1183 #endif
1184
1185 if (ob->authenticated_sender != NULL)
1186 {
1187 uschar *new = expand_string(ob->authenticated_sender);
1188 if (new == NULL)
1189 {
1190 if (!f.expand_string_forcedfail)
1191 {
1192 uschar *message = string_sprintf("failed to expand "
1193 "authenticated_sender: %s", expand_string_message);
1194 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1195 return TRUE;
1196 }
1197 }
1198 else if (new[0] != 0) local_authenticated_sender = new;
1199 }
1200
1201 /* Add the authenticated sender address if present */
1202
1203 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1204 local_authenticated_sender != NULL)
1205 {
1206 string_format(buffer, bufsize, " AUTH=%s",
1207 auth_xtextencode(local_authenticated_sender,
1208 Ustrlen(local_authenticated_sender)));
1209 client_authenticated_sender = string_copy(local_authenticated_sender);
1210 }
1211 else
1212 *buffer= 0;
1213
1214 return FALSE;
1215 }
1216
1217
1218
1219 #ifdef SUPPORT_DANE
1220 /* Lookup TLSA record for host/port.
1221 Return: OK success with dnssec; DANE mode
1222 DEFER Do not use this host now, may retry later
1223 FAIL_FORCED No TLSA record; DANE not usable
1224 FAIL Do not use this connection
1225 */
1226
1227 int
1228 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1229 {
1230 /* move this out to host.c given the similarity to dns_lookup() ? */
1231 uschar buffer[300];
1232 const uschar * fullname = buffer;
1233 int rc;
1234 BOOL sec;
1235
1236 /* TLSA lookup string */
1237 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1238
1239 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1240 sec = dns_is_secure(dnsa);
1241 DEBUG(D_transport)
1242 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1243
1244 switch (rc)
1245 {
1246 case DNS_AGAIN:
1247 return DEFER; /* just defer this TLS'd conn */
1248
1249 case DNS_SUCCEED:
1250 if (sec)
1251 {
1252 DEBUG(D_transport)
1253 {
1254 dns_scan dnss;
1255 dns_record * rr;
1256 for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1257 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == T_TLSA)
1258 {
1259 uint16_t payload_length = rr->size - 3;
1260 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1261
1262 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1263 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1264 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1265 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1266 sp += sprintf(CS sp, "%02x", *p++);
1267
1268 debug_printf(" %s\n", s);
1269 }
1270 }
1271 return OK;
1272 }
1273 log_write(0, LOG_MAIN,
1274 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1275 /*FALLTRHOUGH*/
1276
1277 case DNS_NODATA: /* no TLSA RR for this lookup */
1278 case DNS_NOMATCH: /* no records at all for this lookup */
1279 return dane_required ? FAIL : FAIL_FORCED;
1280
1281 default:
1282 case DNS_FAIL:
1283 return dane_required ? FAIL : DEFER;
1284 }
1285 }
1286 #endif
1287
1288
1289
1290 typedef struct smtp_compare_s
1291 {
1292 uschar *current_sender_address;
1293 struct transport_instance *tblock;
1294 } smtp_compare_t;
1295
1296
1297 /* Create a unique string that identifies this message, it is based on
1298 sender_address, helo_data and tls_certificate if enabled.
1299 */
1300
1301 static uschar *
1302 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1303 {
1304 address_item * addr1;
1305 uschar * if1 = US"";
1306 uschar * helo1 = US"";
1307 #ifdef SUPPORT_TLS
1308 uschar * tlsc1 = US"";
1309 #endif
1310 uschar * save_sender_address = sender_address;
1311 uschar * local_identity = NULL;
1312 smtp_transport_options_block * ob =
1313 (smtp_transport_options_block *)tblock->options_block;
1314
1315 sender_address = sender;
1316
1317 addr1 = deliver_make_addr (sender, TRUE);
1318 deliver_set_expansions(addr1);
1319
1320 if (ob->interface)
1321 if1 = expand_string(ob->interface);
1322
1323 if (ob->helo_data)
1324 helo1 = expand_string(ob->helo_data);
1325
1326 #ifdef SUPPORT_TLS
1327 if (ob->tls_certificate)
1328 tlsc1 = expand_string(ob->tls_certificate);
1329 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1330 #else
1331 local_identity = string_sprintf ("%s^%s", if1, helo1);
1332 #endif
1333
1334 deliver_set_expansions(NULL);
1335 sender_address = save_sender_address;
1336
1337 return local_identity;
1338 }
1339
1340
1341
1342 /* This routine is a callback that is called from transport_check_waiting.
1343 This function will evaluate the incoming message versus the previous
1344 message. If the incoming message is using a different local identity then
1345 we will veto this new message. */
1346
1347 static BOOL
1348 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1349 {
1350 uschar * message_local_identity,
1351 * current_local_identity,
1352 * new_sender_address;
1353
1354 current_local_identity =
1355 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1356
1357 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1358 return 0;
1359
1360 message_local_identity =
1361 smtp_local_identity(new_sender_address, s_compare->tblock);
1362
1363 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1364 }
1365
1366
1367
1368 static unsigned
1369 ehlo_response(uschar * buf, unsigned checks)
1370 {
1371 size_t bsize = Ustrlen(buf);
1372
1373 #ifdef SUPPORT_TLS
1374 if ( checks & OPTION_TLS
1375 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1376 checks &= ~OPTION_TLS;
1377
1378 # ifdef EXPERIMENTAL_REQUIRETLS
1379 if ( checks & OPTION_REQUIRETLS
1380 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1381 checks &= ~OPTION_REQUIRETLS;
1382 # endif
1383 #endif
1384
1385 if ( checks & OPTION_IGNQ
1386 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1387 PCRE_EOPT, NULL, 0) < 0)
1388 checks &= ~OPTION_IGNQ;
1389
1390 if ( checks & OPTION_CHUNKING
1391 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1392 checks &= ~OPTION_CHUNKING;
1393
1394 #ifndef DISABLE_PRDR
1395 if ( checks & OPTION_PRDR
1396 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1397 checks &= ~OPTION_PRDR;
1398 #endif
1399
1400 #ifdef SUPPORT_I18N
1401 if ( checks & OPTION_UTF8
1402 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1403 checks &= ~OPTION_UTF8;
1404 #endif
1405
1406 if ( checks & OPTION_DSN
1407 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1408 checks &= ~OPTION_DSN;
1409
1410 if ( checks & OPTION_PIPE
1411 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1412 PCRE_EOPT, NULL, 0) < 0)
1413 checks &= ~OPTION_PIPE;
1414
1415 if ( checks & OPTION_SIZE
1416 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1417 checks &= ~OPTION_SIZE;
1418
1419 return checks;
1420 }
1421
1422
1423
1424 /* Callback for emitting a BDAT data chunk header.
1425
1426 If given a nonzero size, first flush any buffered SMTP commands
1427 then emit the command.
1428
1429 Reap previous SMTP command responses if requested, and always reap
1430 the response from a previous BDAT command.
1431
1432 Args:
1433 tctx transport context
1434 chunk_size value for SMTP BDAT command
1435 flags
1436 tc_chunk_last add LAST option to SMTP BDAT command
1437 tc_reap_prev reap response to previous SMTP commands
1438
1439 Returns: OK or ERROR
1440 */
1441
1442 static int
1443 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1444 unsigned flags)
1445 {
1446 smtp_transport_options_block * ob =
1447 (smtp_transport_options_block *)(tctx->tblock->options_block);
1448 smtp_context * sx = tctx->smtp_context;
1449 int cmd_count = 0;
1450 int prev_cmd_count;
1451
1452 /* Write SMTP chunk header command. If not reaping responses, note that
1453 there may be more writes (like, the chunk data) done soon. */
1454
1455 if (chunk_size > 0)
1456 {
1457 if((cmd_count = smtp_write_command(sx,
1458 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1459 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1460 ) < 0) return ERROR;
1461 if (flags & tc_chunk_last)
1462 data_command = string_copy(big_buffer); /* Save for later error message */
1463 }
1464
1465 prev_cmd_count = cmd_count += sx->cmd_count;
1466
1467 /* Reap responses for any previous, but not one we just emitted */
1468
1469 if (chunk_size > 0)
1470 prev_cmd_count--;
1471 if (sx->pending_BDAT)
1472 prev_cmd_count--;
1473
1474 if (flags & tc_reap_prev && prev_cmd_count > 0)
1475 {
1476 DEBUG(D_transport) debug_printf("look for %d responses"
1477 " for previous pipelined cmds\n", prev_cmd_count);
1478
1479 switch(sync_responses(sx, prev_cmd_count, 0))
1480 {
1481 case 1: /* 2xx (only) => OK */
1482 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1483 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1484 case 0: break; /* No 2xx or 5xx, but no probs */
1485
1486 case -1: /* Timeout on RCPT */
1487 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1488 }
1489 cmd_count = 1;
1490 if (!sx->pending_BDAT)
1491 pipelining_active = FALSE;
1492 }
1493
1494 /* Reap response for an outstanding BDAT */
1495
1496 if (sx->pending_BDAT)
1497 {
1498 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1499
1500 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1501 ob->command_timeout))
1502 {
1503 if (errno == 0 && sx->buffer[0] == '4')
1504 {
1505 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1506 sx->addrlist->more_errno |=
1507 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1508 }
1509 return ERROR;
1510 }
1511 cmd_count--;
1512 sx->pending_BDAT = FALSE;
1513 pipelining_active = FALSE;
1514 }
1515 else if (chunk_size > 0)
1516 sx->pending_BDAT = TRUE;
1517
1518
1519 sx->cmd_count = cmd_count;
1520 return OK;
1521 }
1522
1523
1524
1525 /*************************************************
1526 * Make connection for given message *
1527 *************************************************/
1528
1529 /*
1530 Arguments:
1531 ctx connection context
1532 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1533 a second attempt after TLS initialization fails
1534
1535 Returns: OK - the connection was made and the delivery attempted;
1536 fd is set in the conn context, tls_out set up.
1537 DEFER - the connection could not be made, or something failed
1538 while setting up the SMTP session, or there was a
1539 non-message-specific error, such as a timeout.
1540 ERROR - helo_data or add_headers or authenticated_sender is
1541 specified for this transport, and the string failed
1542 to expand
1543 */
1544 int
1545 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1546 {
1547 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1548 dns_answer tlsa_dnsa;
1549 #endif
1550 BOOL pass_message = FALSE;
1551 uschar * message = NULL;
1552 int yield = OK;
1553 int rc;
1554
1555 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1556
1557 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1558 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1559 sx->ok = FALSE;
1560 sx->send_rset = TRUE;
1561 sx->send_quit = TRUE;
1562 sx->setting_up = TRUE;
1563 sx->esmtp = TRUE;
1564 sx->esmtp_sent = FALSE;
1565 #ifdef SUPPORT_I18N
1566 sx->utf8_needed = FALSE;
1567 #endif
1568 sx->dsn_all_lasthop = TRUE;
1569 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1570 sx->dane = FALSE;
1571 sx->dane_required =
1572 verify_check_given_host(CUSS &sx->ob->hosts_require_dane, sx->host) == OK;
1573 #endif
1574
1575 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1576 sx->peer_offered = 0;
1577 sx->avoid_option = 0;
1578 sx->igquotstr = US"";
1579 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1580 #ifdef EXPERIMENTAL_DSN_INFO
1581 sx->smtp_greeting = NULL;
1582 sx->helo_response = NULL;
1583 #endif
1584
1585 smtp_command = US"initial connection";
1586 sx->buffer[0] = '\0';
1587
1588 /* Set up the buffer for reading SMTP response packets. */
1589
1590 sx->inblock.buffer = sx->inbuffer;
1591 sx->inblock.buffersize = sizeof(sx->inbuffer);
1592 sx->inblock.ptr = sx->inbuffer;
1593 sx->inblock.ptrend = sx->inbuffer;
1594
1595 /* Set up the buffer for holding SMTP commands while pipelining */
1596
1597 sx->outblock.buffer = sx->outbuffer;
1598 sx->outblock.buffersize = sizeof(sx->outbuffer);
1599 sx->outblock.ptr = sx->outbuffer;
1600 sx->outblock.cmd_count = 0;
1601 sx->outblock.authenticating = FALSE;
1602
1603 /* Reset the parameters of a TLS session. */
1604
1605 tls_out.bits = 0;
1606 tls_out.cipher = NULL; /* the one we may use for this transport */
1607 tls_out.ourcert = NULL;
1608 tls_out.peercert = NULL;
1609 tls_out.peerdn = NULL;
1610 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1611 tls_out.sni = NULL;
1612 #endif
1613 tls_out.ocsp = OCSP_NOT_REQ;
1614
1615 /* Flip the legacy TLS-related variables over to the outbound set in case
1616 they're used in the context of the transport. Don't bother resetting
1617 afterward (when being used by a transport) as we're in a subprocess.
1618 For verify, unflipped once the callout is dealt with */
1619
1620 tls_modify_variables(&tls_out);
1621
1622 #ifndef SUPPORT_TLS
1623 if (sx->smtps)
1624 {
1625 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1626 DEFER, FALSE);
1627 return ERROR;
1628 }
1629 #endif
1630
1631 /* Make a connection to the host if this isn't a continued delivery, and handle
1632 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1633 specially so they can be identified for retries. */
1634
1635 if (!continue_hostname)
1636 {
1637 if (sx->verify)
1638 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1639
1640 /* Get the actual port the connection will use, into sx->host */
1641
1642 smtp_port_for_connect(sx->host, sx->port);
1643
1644 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1645 /* Do TLSA lookup for DANE */
1646 {
1647 tls_out.dane_verified = FALSE;
1648 tls_out.tlsa_usage = 0;
1649
1650 if (sx->host->dnssec == DS_YES)
1651 {
1652 if( sx->dane_required
1653 || verify_check_given_host(CUSS &sx->ob->hosts_try_dane, sx->host) == OK
1654 )
1655 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1656 {
1657 case OK: sx->dane = TRUE;
1658 sx->ob->tls_tempfail_tryclear = FALSE;
1659 break;
1660 case FAIL_FORCED: break;
1661 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1662 string_sprintf("DANE error: tlsa lookup %s",
1663 rc == DEFER ? "DEFER" : "FAIL"),
1664 rc, FALSE);
1665 # ifndef DISABLE_EVENT
1666 (void) event_raise(sx->tblock->event_action,
1667 US"dane:fail", sx->dane_required
1668 ? US"dane-required" : US"dnssec-invalid");
1669 # endif
1670 return rc;
1671 }
1672 }
1673 else if (sx->dane_required)
1674 {
1675 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1676 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1677 FAIL, FALSE);
1678 # ifndef DISABLE_EVENT
1679 (void) event_raise(sx->tblock->event_action,
1680 US"dane:fail", US"dane-required");
1681 # endif
1682 return FAIL;
1683 }
1684 }
1685 #endif /*DANE*/
1686
1687 /* Make the TCP connection */
1688
1689 sx->cctx.sock =
1690 smtp_connect(sx->host, sx->host_af, sx->interface,
1691 sx->ob->connect_timeout, sx->tblock);
1692 sx->cctx.tls_ctx = NULL;
1693 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1694
1695 if (sx->cctx.sock < 0)
1696 {
1697 uschar * msg = NULL;
1698 if (sx->verify)
1699 {
1700 msg = US strerror(errno);
1701 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1702 }
1703 set_errno_nohost(sx->addrlist,
1704 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1705 sx->verify ? string_sprintf("could not connect: %s", msg)
1706 : NULL,
1707 DEFER, FALSE);
1708 sx->send_quit = FALSE;
1709 return DEFER;
1710 }
1711
1712 /* Expand the greeting message while waiting for the initial response. (Makes
1713 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1714 delayed till here so that $sending_interface and $sending_port are set. */
1715
1716 if (sx->helo_data)
1717 if (!(sx->helo_data = expand_string(sx->helo_data)))
1718 if (sx->verify)
1719 log_write(0, LOG_MAIN|LOG_PANIC,
1720 "<%s>: failed to expand transport's helo_data value for callout: %s",
1721 sx->addrlist->address, expand_string_message);
1722
1723 #ifdef SUPPORT_I18N
1724 if (sx->helo_data)
1725 {
1726 expand_string_message = NULL;
1727 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1728 &expand_string_message)),
1729 expand_string_message)
1730 if (sx->verify)
1731 log_write(0, LOG_MAIN|LOG_PANIC,
1732 "<%s>: failed to expand transport's helo_data value for callout: %s",
1733 sx->addrlist->address, expand_string_message);
1734 else
1735 sx->helo_data = NULL;
1736 }
1737 #endif
1738
1739 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1740 is nevertheless a reasonably clean way of programming this kind of logic,
1741 where you want to escape on any error. */
1742
1743 if (!sx->smtps)
1744 {
1745 BOOL good_response;
1746
1747 #ifdef TCP_QUICKACK
1748 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1749 #endif
1750 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1751 '2', sx->ob->command_timeout);
1752 #ifdef EXPERIMENTAL_DSN_INFO
1753 sx->smtp_greeting = string_copy(sx->buffer);
1754 #endif
1755 if (!good_response) goto RESPONSE_FAILED;
1756
1757 #ifndef DISABLE_EVENT
1758 {
1759 uschar * s;
1760 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1761 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1762 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1763 if (s)
1764 {
1765 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1766 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1767 DEFER, FALSE);
1768 yield = DEFER;
1769 goto SEND_QUIT;
1770 }
1771 }
1772 #endif
1773
1774 /* Now check if the helo_data expansion went well, and sign off cleanly if
1775 it didn't. */
1776
1777 if (!sx->helo_data)
1778 {
1779 message = string_sprintf("failed to expand helo_data: %s",
1780 expand_string_message);
1781 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1782 yield = DEFER;
1783 goto SEND_QUIT;
1784 }
1785 }
1786
1787 /** Debugging without sending a message
1788 sx->addrlist->transport_return = DEFER;
1789 goto SEND_QUIT;
1790 **/
1791
1792 /* Errors that occur after this point follow an SMTP command, which is
1793 left in big_buffer by smtp_write_command() for use in error messages. */
1794
1795 smtp_command = big_buffer;
1796
1797 /* Tell the remote who we are...
1798
1799 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1800 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1801 greeting is of this form. The assumption was that the far end supports it
1802 properly... but experience shows that there are some that give 5xx responses,
1803 even though the banner includes "ESMTP" (there's a bloody-minded one that
1804 says "ESMTP not spoken here"). Cope with that case.
1805
1806 September 2000: Time has passed, and it seems reasonable now to always send
1807 EHLO at the start. It is also convenient to make the change while installing
1808 the TLS stuff.
1809
1810 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1811 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1812 would be no way to send out the mails, so there is now a host list
1813 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1814 PIPELINING problem as well. Maybe it can also be useful to cure other
1815 problems with broken servers.
1816
1817 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1818 Then somebody tried it with a Microsoft mailer... It seems that all other
1819 mailers use upper case for some reason (the RFC is quite clear about case
1820 independence) so, for peace of mind, I gave in. */
1821
1822 sx->esmtp = verify_check_given_host(CUSS &sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1823
1824 /* Alas; be careful, since this goto is not an error-out, so conceivably
1825 we might set data between here and the target which we assume to exist
1826 and be usable. I can see this coming back to bite us. */
1827 #ifdef SUPPORT_TLS
1828 if (sx->smtps)
1829 {
1830 smtp_peer_options |= OPTION_TLS;
1831 suppress_tls = FALSE;
1832 sx->ob->tls_tempfail_tryclear = FALSE;
1833 smtp_command = US"SSL-on-connect";
1834 goto TLS_NEGOTIATE;
1835 }
1836 #endif
1837
1838 if (sx->esmtp)
1839 {
1840 if (smtp_write_command(sx, SCMD_FLUSH, "%s %s\r\n",
1841 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1842 goto SEND_FAILED;
1843 sx->esmtp_sent = TRUE;
1844 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1845 sx->ob->command_timeout))
1846 {
1847 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1848 {
1849 #ifdef EXPERIMENTAL_DSN_INFO
1850 sx->helo_response = string_copy(sx->buffer);
1851 #endif
1852 goto RESPONSE_FAILED;
1853 }
1854 sx->esmtp = FALSE;
1855 }
1856 #ifdef EXPERIMENTAL_DSN_INFO
1857 sx->helo_response = string_copy(sx->buffer);
1858 #endif
1859 }
1860 else
1861 DEBUG(D_transport)
1862 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1863
1864 if (!sx->esmtp)
1865 {
1866 BOOL good_response;
1867 int n = sizeof(sx->buffer);
1868 uschar * rsp = sx->buffer;
1869
1870 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1871 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1872
1873 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1874 goto SEND_FAILED;
1875 good_response = smtp_read_response(sx, rsp, n, '2', sx->ob->command_timeout);
1876 #ifdef EXPERIMENTAL_DSN_INFO
1877 sx->helo_response = string_copy(rsp);
1878 #endif
1879 if (!good_response)
1880 {
1881 /* Handle special logging for a closed connection after HELO
1882 when had previously sent EHLO */
1883
1884 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1885 {
1886 errno = ERRNO_SMTPCLOSED;
1887 goto EHLOHELO_FAILED;
1888 }
1889 memmove(sx->buffer, rsp, Ustrlen(rsp));
1890 goto RESPONSE_FAILED;
1891 }
1892 }
1893
1894 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1895
1896 if (sx->esmtp || sx->lmtp)
1897 {
1898 sx->peer_offered = ehlo_response(sx->buffer,
1899 OPTION_TLS /* others checked later */
1900 );
1901
1902 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1903
1904 #ifdef SUPPORT_TLS
1905 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1906 #endif
1907 }
1908 }
1909
1910 /* For continuing deliveries down the same channel, having re-exec'd the socket
1911 is the standard input; for a socket held open from verify it is recorded
1912 in the cutthrough context block. Either way we don't need to redo EHLO here
1913 (but may need to do so for TLS - see below).
1914 Set up the pointer to where subsequent commands will be left, for
1915 error messages. Note that smtp_peer_options will have been
1916 set from the command line if they were set in the process that passed the
1917 connection on. */
1918
1919 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1920 as the continue goes via transport_pass_socket() and doublefork and exec.
1921 It does not wait. Unclear how we keep separate host's responses
1922 separate - we could match up by host ip+port as a bodge. */
1923
1924 else
1925 {
1926 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
1927 {
1928 sx->cctx = cutthrough.cctx;
1929 sx->host->port = sx->port = cutthrough.host.port;
1930 }
1931 else
1932 {
1933 sx->cctx.sock = 0; /* stdin */
1934 sx->cctx.tls_ctx = NULL;
1935 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1936 }
1937 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1938 smtp_command = big_buffer;
1939 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1940
1941 /* For a continued connection with TLS being proxied for us, or a
1942 held-open verify connection with TLS, nothing more to do. */
1943
1944 if ( continue_proxy_cipher
1945 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
1946 && cutthrough.is_tls)
1947 )
1948 {
1949 sx->peer_offered = smtp_peer_options;
1950 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1951 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1952 continue_proxy_cipher ? "proxied" : "verify conn with");
1953 return OK;
1954 }
1955 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1956 }
1957
1958 /* If TLS is available on this connection, whether continued or not, attempt to
1959 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1960 send another EHLO - the server may give a different answer in secure mode. We
1961 use a separate buffer for reading the response to STARTTLS so that if it is
1962 negative, the original EHLO data is available for subsequent analysis, should
1963 the client not be required to use TLS. If the response is bad, copy the buffer
1964 for error analysis. */
1965
1966 #ifdef SUPPORT_TLS
1967 if ( smtp_peer_options & OPTION_TLS
1968 && !suppress_tls
1969 && verify_check_given_host(CUSS &sx->ob->hosts_avoid_tls, sx->host) != OK
1970 && ( !sx->verify
1971 || verify_check_given_host(CUSS &sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1972 ) )
1973 {
1974 uschar buffer2[4096];
1975 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1976 goto SEND_FAILED;
1977
1978 /* If there is an I/O error, transmission of this message is deferred. If
1979 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1980 false, we also defer. However, if there is a temporary rejection of STARTTLS
1981 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1982 STARTTLS, we carry on. This means we will try to send the message in clear,
1983 unless the host is in hosts_require_tls (tested below). */
1984
1985 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2',
1986 sx->ob->command_timeout))
1987 {
1988 if ( errno != 0
1989 || buffer2[0] == 0
1990 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1991 )
1992 {
1993 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1994 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1995 goto RESPONSE_FAILED;
1996 }
1997 }
1998
1999 /* STARTTLS accepted: try to negotiate a TLS session. */
2000
2001 else
2002 TLS_NEGOTIATE:
2003 {
2004 address_item * addr;
2005 uschar * errstr;
2006 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->host,
2007 sx->addrlist, sx->tblock,
2008 # ifdef SUPPORT_DANE
2009 sx->dane ? &tlsa_dnsa : NULL,
2010 # endif
2011 &tls_out, &errstr);
2012
2013 if (!sx->cctx.tls_ctx)
2014 {
2015 /* TLS negotiation failed; give an error. From outside, this function may
2016 be called again to try in clear on a new connection, if the options permit
2017 it for this host. */
2018 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2019
2020 # ifdef SUPPORT_DANE
2021 if (sx->dane)
2022 {
2023 log_write(0, LOG_MAIN,
2024 "DANE attempt failed; TLS connection to %s [%s]: %s",
2025 sx->host->name, sx->host->address, errstr);
2026 # ifndef DISABLE_EVENT
2027 (void) event_raise(sx->tblock->event_action,
2028 US"dane:fail", US"validation-failure"); /* could do with better detail */
2029 # endif
2030 }
2031 # endif
2032
2033 errno = ERRNO_TLSFAILURE;
2034 message = string_sprintf("TLS session: %s", errstr);
2035 sx->send_quit = FALSE;
2036 goto TLS_FAILED;
2037 }
2038
2039 /* TLS session is set up */
2040
2041 smtp_peer_options_wrap = smtp_peer_options;
2042 for (addr = sx->addrlist; addr; addr = addr->next)
2043 if (addr->transport_return == PENDING_DEFER)
2044 {
2045 addr->cipher = tls_out.cipher;
2046 addr->ourcert = tls_out.ourcert;
2047 addr->peercert = tls_out.peercert;
2048 addr->peerdn = tls_out.peerdn;
2049 addr->ocsp = tls_out.ocsp;
2050 }
2051 }
2052 }
2053
2054 /* if smtps, we'll have smtp_command set to something else; always safe to
2055 reset it here. */
2056 smtp_command = big_buffer;
2057
2058 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2059 helo_data is null, we are dealing with a connection that was passed from
2060 another process, and so we won't have expanded helo_data above. We have to
2061 expand it here. $sending_ip_address and $sending_port are set up right at the
2062 start of the Exim process (in exim.c). */
2063
2064 if (tls_out.active.sock >= 0)
2065 {
2066 char *greeting_cmd;
2067 BOOL good_response;
2068
2069 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2070 {
2071 uschar *message = string_sprintf("failed to expand helo_data: %s",
2072 expand_string_message);
2073 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2074 yield = DEFER;
2075 goto SEND_QUIT;
2076 }
2077
2078 /* For SMTPS we need to wait for the initial OK response. */
2079 if (sx->smtps)
2080 {
2081 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
2082 '2', sx->ob->command_timeout);
2083 #ifdef EXPERIMENTAL_DSN_INFO
2084 sx->smtp_greeting = string_copy(sx->buffer);
2085 #endif
2086 if (!good_response) goto RESPONSE_FAILED;
2087 }
2088
2089 if (sx->esmtp)
2090 greeting_cmd = "EHLO";
2091 else
2092 {
2093 greeting_cmd = "HELO";
2094 DEBUG(D_transport)
2095 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2096 }
2097
2098 if (smtp_write_command(sx, SCMD_FLUSH, "%s %s\r\n",
2099 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2100 goto SEND_FAILED;
2101 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
2102 '2', sx->ob->command_timeout);
2103 #ifdef EXPERIMENTAL_DSN_INFO
2104 sx->helo_response = string_copy(sx->buffer);
2105 #endif
2106 if (!good_response) goto RESPONSE_FAILED;
2107 smtp_peer_options = 0;
2108 }
2109
2110 /* If the host is required to use a secure channel, ensure that we
2111 have one. */
2112
2113 else if ( sx->smtps
2114 # ifdef SUPPORT_DANE
2115 || sx->dane
2116 # endif
2117 # ifdef EXPERIMENTAL_REQUIRETLS
2118 || tls_requiretls & REQUIRETLS_MSG
2119 # endif
2120 || verify_check_given_host(CUSS &sx->ob->hosts_require_tls, sx->host) == OK
2121 )
2122 {
2123 errno =
2124 # ifdef EXPERIMENTAL_REQUIRETLS
2125 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2126 # endif
2127 ERRNO_TLSREQUIRED;
2128 message = string_sprintf("a TLS session is required, but %s",
2129 smtp_peer_options & OPTION_TLS
2130 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2131 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2132 if (sx->dane)
2133 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2134 smtp_peer_options & OPTION_TLS
2135 ? US"validation-failure" /* could do with better detail */
2136 : US"starttls-not-supported");
2137 # endif
2138 goto TLS_FAILED;
2139 }
2140 #endif /*SUPPORT_TLS*/
2141
2142 /* If TLS is active, we have just started it up and re-done the EHLO command,
2143 so its response needs to be analyzed. If TLS is not active and this is a
2144 continued session down a previously-used socket, we haven't just done EHLO, so
2145 we skip this. */
2146
2147 if (continue_hostname == NULL
2148 #ifdef SUPPORT_TLS
2149 || tls_out.active.sock >= 0
2150 #endif
2151 )
2152 {
2153 if (sx->esmtp || sx->lmtp)
2154 {
2155 sx->peer_offered = ehlo_response(sx->buffer,
2156 0 /* no TLS */
2157 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2158 | OPTION_CHUNKING
2159 | OPTION_PRDR
2160 #ifdef SUPPORT_I18N
2161 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2162 /*XXX if we hand peercaps on to continued-conn processes,
2163 must not depend on this addr */
2164 #endif
2165 | OPTION_DSN
2166 | OPTION_PIPE
2167 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2168 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2169 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2170 #endif
2171 );
2172
2173 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2174 lmtp_ignore_quota option was set. */
2175
2176 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2177
2178 /* If the response to EHLO specified support for the SIZE parameter, note
2179 this, provided size_addition is non-negative. */
2180
2181 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2182
2183 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2184 the current host, esmtp will be false, so PIPELINING can never be used. If
2185 the current host matches hosts_avoid_pipelining, don't do it. */
2186
2187 if ( sx->peer_offered & OPTION_PIPE
2188 && verify_check_given_host(CUSS &sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2189 smtp_peer_options |= OPTION_PIPE;
2190
2191 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2192 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2193
2194 if ( sx->peer_offered & OPTION_CHUNKING
2195 && verify_check_given_host(CUSS &sx->ob->hosts_try_chunking, sx->host) != OK)
2196 sx->peer_offered &= ~OPTION_CHUNKING;
2197
2198 if (sx->peer_offered & OPTION_CHUNKING)
2199 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2200
2201 #ifndef DISABLE_PRDR
2202 if ( sx->peer_offered & OPTION_PRDR
2203 && verify_check_given_host(CUSS &sx->ob->hosts_try_prdr, sx->host) != OK)
2204 sx->peer_offered &= ~OPTION_PRDR;
2205
2206 if (sx->peer_offered & OPTION_PRDR)
2207 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2208 #endif
2209
2210 /* Note if the server supports DSN */
2211 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2212 DEBUG(D_transport) debug_printf("%susing DSN\n",
2213 sx->peer_offered & OPTION_DSN ? "" : "not ");
2214
2215 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2216 if (sx->peer_offered & OPTION_REQUIRETLS)
2217 {
2218 smtp_peer_options |= OPTION_REQUIRETLS;
2219 DEBUG(D_transport) debug_printf(
2220 tls_requiretls & REQUIRETLS_MSG
2221 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2222 }
2223 #endif
2224
2225 /* Note if the response to EHLO specifies support for the AUTH extension.
2226 If it has, check that this host is one we want to authenticate to, and do
2227 the business. The host name and address must be available when the
2228 authenticator's client driver is running. */
2229
2230 switch (yield = smtp_auth(sx, sx->buffer, sizeof(sx->buffer)))
2231 {
2232 default: goto SEND_QUIT;
2233 case OK: break;
2234 case FAIL_SEND: goto SEND_FAILED;
2235 case FAIL: goto RESPONSE_FAILED;
2236 }
2237 }
2238 }
2239 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2240
2241 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2242 message-specific. */
2243
2244 sx->setting_up = FALSE;
2245
2246 #ifdef SUPPORT_I18N
2247 if (sx->addrlist->prop.utf8_msg)
2248 {
2249 uschar * s;
2250
2251 /* If the transport sets a downconversion mode it overrides any set by ACL
2252 for the message. */
2253
2254 if ((s = sx->ob->utf8_downconvert))
2255 {
2256 if (!(s = expand_string(s)))
2257 {
2258 message = string_sprintf("failed to expand utf8_downconvert: %s",
2259 expand_string_message);
2260 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2261 yield = DEFER;
2262 goto SEND_QUIT;
2263 }
2264 switch (*s)
2265 {
2266 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2267 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2268 break;
2269 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2270 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2271 break;
2272 case '-': if (s[1] == '1')
2273 {
2274 sx->addrlist->prop.utf8_downcvt = FALSE;
2275 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2276 }
2277 break;
2278 }
2279 }
2280
2281 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2282 && !sx->addrlist->prop.utf8_downcvt_maybe;
2283 DEBUG(D_transport) if (!sx->utf8_needed)
2284 debug_printf("utf8: %s downconvert\n",
2285 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2286 }
2287
2288 /* If this is an international message we need the host to speak SMTPUTF8 */
2289 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2290 {
2291 errno = ERRNO_UTF8_FWD;
2292 goto RESPONSE_FAILED;
2293 }
2294 #endif /*SUPPORT_I18N*/
2295
2296 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2297 /*XXX should tls_requiretls actually be per-addr? */
2298
2299 if ( tls_requiretls & REQUIRETLS_MSG
2300 && !(sx->peer_offered & OPTION_REQUIRETLS)
2301 )
2302 {
2303 sx->setting_up = TRUE;
2304 errno = ERRNO_REQUIRETLS;
2305 message = US"REQUIRETLS support is required from the server"
2306 " but it was not offered";
2307 DEBUG(D_transport) debug_printf("%s\n", message);
2308 goto TLS_FAILED;
2309 }
2310 #endif
2311
2312 return OK;
2313
2314
2315 {
2316 int code;
2317
2318 RESPONSE_FAILED:
2319 message = NULL;
2320 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2321 sx->buffer, &code, &message, &pass_message);
2322 yield = DEFER;
2323 goto FAILED;
2324
2325 SEND_FAILED:
2326 code = '4';
2327 message = US string_sprintf("send() to %s [%s] failed: %s",
2328 sx->host->name, sx->host->address, strerror(errno));
2329 sx->send_quit = FALSE;
2330 yield = DEFER;
2331 goto FAILED;
2332
2333 EHLOHELO_FAILED:
2334 code = '4';
2335 message = string_sprintf("Remote host closed connection in response to %s"
2336 " (EHLO response was: %s)", smtp_command, sx->buffer);
2337 sx->send_quit = FALSE;
2338 yield = DEFER;
2339 goto FAILED;
2340
2341 /* This label is jumped to directly when a TLS negotiation has failed,
2342 or was not done for a host for which it is required. Values will be set
2343 in message and errno, and setting_up will always be true. Treat as
2344 a temporary error. */
2345
2346 #ifdef SUPPORT_TLS
2347 TLS_FAILED:
2348 # ifdef EXPERIMENTAL_REQUIRETLS
2349 if (errno == ERRNO_REQUIRETLS)
2350 code = '5', yield = FAIL;
2351 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2352 else
2353 # endif
2354 code = '4', yield = DEFER;
2355 goto FAILED;
2356 #endif
2357
2358 /* The failure happened while setting up the call; see if the failure was
2359 a 5xx response (this will either be on connection, or following HELO - a 5xx
2360 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2361 fail all addresses, as this host is never going to accept them. For other
2362 errors during setting up (timeouts or whatever), defer all addresses, and
2363 yield DEFER, so that the host is not tried again for a while.
2364
2365 XXX This peeking for another host feels like a layering violation. We want
2366 to note the host as unusable, but down here we shouldn't know if this was
2367 the last host to try for the addr(list). Perhaps the upper layer should be
2368 the one to do set_errno() ? The problem is that currently the addr is where
2369 errno etc. are stashed, but until we run out of hosts to try the errors are
2370 host-specific. Maybe we should enhance the host_item definition? */
2371
2372 FAILED:
2373 sx->ok = FALSE; /* For when reached by GOTO */
2374 set_errno(sx->addrlist, errno, message,
2375 sx->host->next
2376 ? DEFER
2377 : code == '5'
2378 #ifdef SUPPORT_I18N
2379 || errno == ERRNO_UTF8_FWD
2380 #endif
2381 ? FAIL : DEFER,
2382 pass_message, sx->host
2383 #ifdef EXPERIMENTAL_DSN_INFO
2384 , sx->smtp_greeting, sx->helo_response
2385 #endif
2386 );
2387 }
2388
2389
2390 SEND_QUIT:
2391
2392 if (sx->send_quit)
2393 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2394
2395 #ifdef SUPPORT_TLS
2396 if (sx->cctx.tls_ctx)
2397 {
2398 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2399 sx->cctx.tls_ctx = NULL;
2400 }
2401 #endif
2402
2403 /* Close the socket, and return the appropriate value, first setting
2404 works because the NULL setting is passed back to the calling process, and
2405 remote_max_parallel is forced to 1 when delivering over an existing connection,
2406 */
2407
2408 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2409 if (sx->send_quit)
2410 {
2411 shutdown(sx->cctx.sock, SHUT_WR);
2412 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2413 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2414 rc--; /* drain socket */
2415 sx->send_quit = FALSE;
2416 }
2417 (void)close(sx->cctx.sock);
2418 sx->cctx.sock = -1;
2419
2420 #ifndef DISABLE_EVENT
2421 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2422 #endif
2423
2424 continue_transport = NULL;
2425 continue_hostname = NULL;
2426 return yield;
2427 }
2428
2429
2430
2431
2432 /* Create the string of options that will be appended to the MAIL FROM:
2433 in the connection context buffer */
2434
2435 static int
2436 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2437 {
2438 uschar * p = sx->buffer;
2439 address_item * addr;
2440 int address_count;
2441
2442 *p = 0;
2443
2444 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2445 send it, adding something to the message size to allow for imprecision
2446 and things that get added en route. Exim keeps the number of lines
2447 in a message, so we can give an accurate value for the original message, but we
2448 need some additional to handle added headers. (Double "." characters don't get
2449 included in the count.) */
2450
2451 if ( message_size > 0
2452 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2453 {
2454 /*XXX problem here under spool_files_wireformat?
2455 Or just forget about lines? Or inflate by a fixed proportion? */
2456
2457 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2458 while (*p) p++;
2459 }
2460
2461 #ifndef DISABLE_PRDR
2462 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2463 request that */
2464
2465 sx->prdr_active = FALSE;
2466 if (sx->peer_offered & OPTION_PRDR)
2467 for (addr = addrlist; addr; addr = addr->next)
2468 if (addr->transport_return == PENDING_DEFER)
2469 {
2470 for (addr = addr->next; addr; addr = addr->next)
2471 if (addr->transport_return == PENDING_DEFER)
2472 { /* at least two recipients to send */
2473 sx->prdr_active = TRUE;
2474 sprintf(CS p, " PRDR"); p += 5;
2475 break;
2476 }
2477 break;
2478 }
2479 #endif
2480
2481 #ifdef SUPPORT_I18N
2482 /* If it supports internationalised messages, and this meesage need that,
2483 request it */
2484
2485 if ( sx->peer_offered & OPTION_UTF8
2486 && addrlist->prop.utf8_msg
2487 && !addrlist->prop.utf8_downcvt
2488 )
2489 Ustrcpy(p, " SMTPUTF8"), p += 9;
2490 #endif
2491
2492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2493 if (tls_requiretls & REQUIRETLS_MSG)
2494 Ustrcpy(p, " REQUIRETLS") , p += 11;
2495 #endif
2496
2497 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2498 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2499 addr && address_count < sx->max_rcpt;
2500 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2501 {
2502 address_count++;
2503 if (!(addr->dsn_flags & rf_dsnlasthop))
2504 {
2505 sx->dsn_all_lasthop = FALSE;
2506 break;
2507 }
2508 }
2509
2510 /* Add any DSN flags to the mail command */
2511
2512 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2513 {
2514 if (dsn_ret == dsn_ret_hdrs)
2515 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2516 else if (dsn_ret == dsn_ret_full)
2517 { Ustrcpy(p, " RET=FULL"); p += 9; }
2518
2519 if (dsn_envid)
2520 {
2521 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2522 while (*p) p++;
2523 }
2524 }
2525
2526 /* If an authenticated_sender override has been specified for this transport
2527 instance, expand it. If the expansion is forced to fail, and there was already
2528 an authenticated_sender for this message, the original value will be used.
2529 Other expansion failures are serious. An empty result is ignored, but there is
2530 otherwise no check - this feature is expected to be used with LMTP and other
2531 cases where non-standard addresses (e.g. without domains) might be required. */
2532
2533 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2534 return ERROR;
2535
2536 return OK;
2537 }
2538
2539
2540 static void
2541 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2542 {
2543 uschar * p = sx->buffer;
2544 *p = 0;
2545
2546 /* Add any DSN flags to the rcpt command */
2547
2548 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2549 {
2550 if (addr->dsn_flags & rf_dsnflags)
2551 {
2552 int i;
2553 BOOL first = TRUE;
2554
2555 Ustrcpy(p, " NOTIFY=");
2556 while (*p) p++;
2557 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2558 {
2559 if (!first) *p++ = ',';
2560 first = FALSE;
2561 Ustrcpy(p, rf_names[i]);
2562 while (*p) p++;
2563 }
2564 }
2565
2566 if (addr->dsn_orcpt)
2567 {
2568 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2569 addr->dsn_orcpt);
2570 while (*p) p++;
2571 }
2572 }
2573 }
2574
2575
2576
2577 /*
2578 Return:
2579 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2580 -1 MAIL response error
2581 -2 any non-MAIL read i/o error
2582 -3 non-MAIL response timeout
2583 -4 internal error; channel still usable
2584 -5 transmit failed
2585 */
2586
2587 int
2588 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2589 {
2590 address_item * addr;
2591 int address_count;
2592 int rc;
2593
2594 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2595 {
2596 *yield = ERROR;
2597 return -4;
2598 }
2599
2600 /* From here until we send the DATA command, we can make use of PIPELINING
2601 if the server host supports it. The code has to be able to check the responses
2602 at any point, for when the buffer fills up, so we write it totally generally.
2603 When PIPELINING is off, each command written reports that it has flushed the
2604 buffer. */
2605
2606 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2607
2608 {
2609 uschar * s = sx->from_addr;
2610 #ifdef SUPPORT_I18N
2611 uschar * errstr = NULL;
2612
2613 /* If we must downconvert, do the from-address here. Remember we had to
2614 for the to-addresses (done below), and also (ugly) for re-doing when building
2615 the delivery log line. */
2616
2617 if ( sx->addrlist->prop.utf8_msg
2618 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2619 )
2620 {
2621 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2622 {
2623 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2624 *yield = ERROR;
2625 return -4;
2626 }
2627 setflag(sx->addrlist, af_utf8_downcvt);
2628 }
2629 #endif
2630
2631 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2632 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2633 }
2634
2635 mail_command = string_copy(big_buffer); /* Save for later error message */
2636
2637 switch(rc)
2638 {
2639 case -1: /* Transmission error */
2640 return -5;
2641
2642 case +1: /* Cmd was sent */
2643 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
2644 sx->ob->command_timeout))
2645 {
2646 if (errno == 0 && sx->buffer[0] == '4')
2647 {
2648 errno = ERRNO_MAIL4XX;
2649 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2650 }
2651 return -1;
2652 }
2653 sx->pending_MAIL = FALSE;
2654 break;
2655
2656 /* otherwise zero: command queued for pipeline */
2657 }
2658
2659 /* Pass over all the relevant recipient addresses for this host, which are the
2660 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2661 several before we have to read the responses for those seen so far. This
2662 checking is done by a subroutine because it also needs to be done at the end.
2663 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2664 the next one if not all are sent.
2665
2666 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2667 last address because we want to abort if any recipients have any kind of
2668 problem, temporary or permanent. We know that all recipient addresses will have
2669 the PENDING_DEFER status, because only one attempt is ever made, and we know
2670 that max_rcpt will be large, so all addresses will be done at once.
2671
2672 For verify we flush the pipeline after any (the only) rcpt address. */
2673
2674 for (addr = sx->first_addr, address_count = 0;
2675 addr && address_count < sx->max_rcpt;
2676 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2677 {
2678 int count;
2679 BOOL no_flush;
2680 uschar * rcpt_addr;
2681
2682 if (tcp_out_fastopen && !f.tcp_out_fastopen_logged)
2683 {
2684 setflag(addr, af_tcp_fastopen_conn);
2685 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2686 }
2687
2688 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2689 ? dsn_support_yes : dsn_support_no;
2690
2691 address_count++;
2692 no_flush = pipelining_active && !sx->verify
2693 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2694
2695 build_rcptcmd_options(sx, addr);
2696
2697 /* Now send the RCPT command, and process outstanding responses when
2698 necessary. After a timeout on RCPT, we just end the function, leaving the
2699 yield as OK, because this error can often mean that there is a problem with
2700 just one address, so we don't want to delay the host. */
2701
2702 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2703
2704 #ifdef SUPPORT_I18N
2705 if ( testflag(sx->addrlist, af_utf8_downcvt)
2706 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2707 )
2708 {
2709 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2710 errno = ERRNO_EXPANDFAIL;
2711 return -5; /*XXX too harsh? */
2712 }
2713 #endif
2714
2715 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2716 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2717
2718 if (count < 0) return -5;
2719 if (count > 0)
2720 {
2721 switch(sync_responses(sx, count, 0))
2722 {
2723 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2724 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2725 break;
2726
2727 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2728 if (!sx->lmtp) /* can't tell about progress yet */
2729 sx->completed_addr = TRUE;
2730 case 0: /* No 2xx or 5xx, but no probs */
2731 break;
2732
2733 case -1: return -3; /* Timeout on RCPT */
2734 case -2: return -2; /* non-MAIL read i/o error */
2735 default: return -1; /* any MAIL error */
2736 }
2737 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2738 }
2739 } /* Loop for next address */
2740
2741 f.tcp_out_fastopen_logged = TRUE;
2742 sx->next_addr = addr;
2743 return 0;
2744 }
2745
2746
2747 #ifdef SUPPORT_TLS
2748 /*****************************************************
2749 * Proxy TLS connection for another transport process *
2750 ******************************************************/
2751 /*
2752 Close the unused end of the pipe, fork once more, then use the given buffer
2753 as a staging area, and select on both the given fd and the TLS'd client-fd for
2754 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2755 Do blocking full-size writes, and reads under a timeout. Once both input
2756 channels are closed, exit the process.
2757
2758 Arguments:
2759 ct_ctx tls context
2760 buf space to use for buffering
2761 bufsiz size of buffer
2762 pfd pipe filedescriptor array; [0] is comms to proxied process
2763 timeout per-read timeout, seconds
2764 */
2765
2766 void
2767 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
2768 int timeout)
2769 {
2770 fd_set rfds, efds;
2771 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
2772 int rc, i, fd_bits, nbytes;
2773
2774 close(pfd[1]);
2775 if ((rc = fork()))
2776 {
2777 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2778 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2779 }
2780
2781 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
2782 set_process_info("proxying TLS connection for continued transport");
2783 FD_ZERO(&rfds);
2784 FD_SET(tls_out.active.sock, &rfds);
2785 FD_SET(pfd[0], &rfds);
2786
2787 for (fd_bits = 3; fd_bits; )
2788 {
2789 time_t time_left = timeout;
2790 time_t time_start = time(NULL);
2791
2792 /* wait for data */
2793 efds = rfds;
2794 do
2795 {
2796 struct timeval tv = { time_left, 0 };
2797
2798 rc = select(max_fd,
2799 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2800
2801 if (rc < 0 && errno == EINTR)
2802 if ((time_left -= time(NULL) - time_start) > 0) continue;
2803
2804 if (rc <= 0)
2805 {
2806 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2807 goto done;
2808 }
2809
2810 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
2811 {
2812 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2813 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2814 goto done;
2815 }
2816 }
2817 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
2818
2819 /* handle inbound data */
2820 if (FD_ISSET(tls_out.active.sock, &rfds))
2821 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
2822 {
2823 fd_bits &= ~1;
2824 FD_CLR(tls_out.active.sock, &rfds);
2825 shutdown(pfd[0], SHUT_WR);
2826 timeout = 5;
2827 }
2828 else
2829 {
2830 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2831 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2832 }
2833 else if (fd_bits & 1)
2834 FD_SET(tls_out.active.sock, &rfds);
2835
2836 /* handle outbound data */
2837 if (FD_ISSET(pfd[0], &rfds))
2838 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2839 {
2840 fd_bits = 0;
2841 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
2842 ct_ctx = NULL;
2843 }
2844 else
2845 {
2846 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2847 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
2848 goto done;
2849 }
2850 else if (fd_bits & 2)
2851 FD_SET(pfd[0], &rfds);
2852 }
2853
2854 done:
2855 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
2856 exim_exit(0, US"TLS proxy");
2857 }
2858 #endif
2859
2860
2861 /*************************************************
2862 * Deliver address list to given host *
2863 *************************************************/
2864
2865 /* If continue_hostname is not null, we get here only when continuing to
2866 deliver down an existing channel. The channel was passed as the standard
2867 input. TLS is never active on a passed channel; the previous process always
2868 closes it down before passing the connection on.
2869
2870 Otherwise, we have to make a connection to the remote host, and do the
2871 initial protocol exchange.
2872
2873 When running as an MUA wrapper, if the sender or any recipient is rejected,
2874 temporarily or permanently, we force failure for all recipients.
2875
2876 Arguments:
2877 addrlist chain of potential addresses to deliver; only those whose
2878 transport_return field is set to PENDING_DEFER are currently
2879 being processed; others should be skipped - they have either
2880 been delivered to an earlier host or IP address, or been
2881 failed by one of them.
2882 host host to deliver to
2883 host_af AF_INET or AF_INET6
2884 defport default TCP/IP port to use if host does not specify, in host
2885 byte order
2886 interface interface to bind to, or NULL
2887 tblock transport instance block
2888 message_defer set TRUE if yield is OK, but all addresses were deferred
2889 because of a non-recipient, non-host failure, that is, a
2890 4xx response to MAIL FROM, DATA, or ".". This is a defer
2891 that is specific to the message.
2892 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2893 a second attempt after TLS initialization fails
2894
2895 Returns: OK - the connection was made and the delivery attempted;
2896 the result for each address is in its data block.
2897 DEFER - the connection could not be made, or something failed
2898 while setting up the SMTP session, or there was a
2899 non-message-specific error, such as a timeout.
2900 ERROR - a filter command is specified for this transport,
2901 and there was a problem setting it up; OR helo_data
2902 or add_headers or authenticated_sender is specified
2903 for this transport, and the string failed to expand
2904 */
2905
2906 static int
2907 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2908 uschar *interface, transport_instance *tblock,
2909 BOOL *message_defer, BOOL suppress_tls)
2910 {
2911 address_item *addr;
2912 int yield = OK;
2913 int save_errno;
2914 int rc;
2915 struct timeval start_delivery_time;
2916
2917 BOOL pass_message = FALSE;
2918 uschar *message = NULL;
2919 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2920
2921 smtp_context sx;
2922
2923 gettimeofday(&start_delivery_time, NULL);
2924 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2925 *message_defer = FALSE;
2926
2927 sx.addrlist = addrlist;
2928 sx.host = host;
2929 sx.host_af = host_af,
2930 sx.port = defport;
2931 sx.interface = interface;
2932 sx.helo_data = NULL;
2933 sx.tblock = tblock;
2934 sx.verify = FALSE;
2935
2936 /* Get the channel set up ready for a message (MAIL FROM being the next
2937 SMTP command to send */
2938
2939 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2940 return rc;
2941
2942 /* If there is a filter command specified for this transport, we can now
2943 set it up. This cannot be done until the identify of the host is known. */
2944
2945 if (tblock->filter_command)
2946 {
2947 transport_filter_timeout = tblock->filter_timeout;
2948
2949 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2950 yield ERROR. */
2951
2952 if (!transport_set_up_command(&transport_filter_argv,
2953 tblock->filter_command, TRUE, DEFER, addrlist,
2954 string_sprintf("%.50s transport", tblock->name), NULL))
2955 {
2956 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2957 FALSE);
2958 yield = ERROR;
2959 goto SEND_QUIT;
2960 }
2961
2962 if ( transport_filter_argv
2963 && *transport_filter_argv
2964 && **transport_filter_argv
2965 && sx.peer_offered & OPTION_CHUNKING
2966 )
2967 {
2968 sx.peer_offered &= ~OPTION_CHUNKING;
2969 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2970 }
2971 }
2972
2973 sx.first_addr = addrlist;
2974
2975 /* For messages that have more than the maximum number of envelope recipients,
2976 we want to send several transactions down the same SMTP connection. (See
2977 comments in deliver.c as to how this reconciles, heuristically, with
2978 remote_max_parallel.) This optimization was added to Exim after the following
2979 code was already working. The simplest way to put it in without disturbing the
2980 code was to use a goto to jump back to this point when there is another
2981 transaction to handle. */
2982
2983 SEND_MESSAGE:
2984 sx.from_addr = return_path;
2985 sx.sync_addr = sx.first_addr;
2986 sx.ok = FALSE;
2987 sx.send_rset = TRUE;
2988 sx.completed_addr = FALSE;
2989
2990
2991 /* If we are a continued-connection-after-verify the MAIL and RCPT
2992 commands were already sent; do not re-send but do mark the addrs as
2993 having been accepted up to RCPT stage. A traditional cont-conn
2994 always has a sequence number greater than one. */
2995
2996 if (continue_hostname && continue_sequence == 1)
2997 {
2998 address_item * addr;
2999
3000 sx.peer_offered = smtp_peer_options;
3001 sx.pending_MAIL = FALSE;
3002 sx.ok = TRUE;
3003 sx.next_addr = NULL;
3004
3005 for (addr = addrlist; addr; addr = addr->next)
3006 addr->transport_return = PENDING_OK;
3007 }
3008 else
3009 {
3010 /* Initiate a message transfer. */
3011
3012 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3013 {
3014 case 0: break;
3015 case -1: case -2: goto RESPONSE_FAILED;
3016 case -3: goto END_OFF;
3017 case -4: goto SEND_QUIT;
3018 default: goto SEND_FAILED;
3019 }
3020
3021 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3022 permanently or temporarily. We should have flushed and synced after the last
3023 RCPT. */
3024
3025 if (mua_wrapper)
3026 {
3027 address_item * a;
3028 unsigned cnt;
3029
3030 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3031 if (a->transport_return != PENDING_OK)
3032 {
3033 /*XXX could we find a better errno than 0 here? */
3034 set_errno_nohost(addrlist, 0, a->message, FAIL,
3035 testflag(a, af_pass_message));
3036 sx.ok = FALSE;
3037 break;
3038 }
3039 }
3040 }
3041
3042 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3043 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3044 have a good recipient buffered up if we are pipelining. We don't want to waste
3045 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3046 are pipelining. The responses are all handled by sync_responses().
3047 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3048 to send is. */
3049
3050 if ( !(sx.peer_offered & OPTION_CHUNKING)
3051 && (sx.ok || (pipelining_active && !mua_wrapper)))
3052 {
3053 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3054
3055 if (count < 0) goto SEND_FAILED;
3056 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3057 {
3058 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3059 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3060 break;
3061
3062 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3063 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3064 case 0: break; /* No 2xx or 5xx, but no probs */
3065
3066 case -1: goto END_OFF; /* Timeout on RCPT */
3067 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3068 }
3069 pipelining_active = FALSE;
3070 data_command = string_copy(big_buffer); /* Save for later error message */
3071 }
3072
3073 /* If there were no good recipients (but otherwise there have been no
3074 problems), just set ok TRUE, since we have handled address-specific errors
3075 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3076 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3077 well as body. Set the appropriate timeout value to be used for each chunk.
3078 (Haven't been able to make it work using select() for writing yet.) */
3079
3080 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3081 {
3082 /* Save the first address of the next batch. */
3083 sx.first_addr = sx.next_addr;
3084
3085 sx.ok = TRUE;
3086 }
3087 else
3088 {
3089 transport_ctx tctx = {
3090 {sx.cctx.sock}, /*XXX will this need TLS info? */
3091 tblock,
3092 addrlist,
3093 US".", US"..", /* Escaping strings */
3094 topt_use_crlf | topt_escape_headers
3095 | (tblock->body_only ? topt_no_headers : 0)
3096 | (tblock->headers_only ? topt_no_body : 0)
3097 | (tblock->return_path_add ? topt_add_return_path : 0)
3098 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3099 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3100 };
3101
3102 /* If using CHUNKING we need a callback from the generic transport
3103 support to us, for the sending of BDAT smtp commands and the reaping
3104 of responses. The callback needs a whole bunch of state so set up
3105 a transport-context structure to be passed around. */
3106
3107 if (sx.peer_offered & OPTION_CHUNKING)
3108 {
3109 tctx.check_string = tctx.escape_string = NULL;
3110 tctx.options |= topt_use_bdat;
3111 tctx.chunk_cb = smtp_chunk_cmd_callback;
3112 sx.pending_BDAT = FALSE;
3113 sx.good_RCPT = sx.ok;
3114 sx.cmd_count = 0;
3115 tctx.smtp_context = &sx;
3116 }
3117 else
3118 tctx.options |= topt_end_dot;
3119
3120 /* Save the first address of the next batch. */
3121 sx.first_addr = sx.next_addr;
3122
3123 /* Responses from CHUNKING commands go in buffer. Otherwise,
3124 there has not been a response. */
3125
3126 sx.buffer[0] = 0;
3127
3128 sigalrm_seen = FALSE;
3129 transport_write_timeout = sx.ob->data_timeout;
3130 smtp_command = US"sending data block"; /* For error messages */
3131 DEBUG(D_transport|D_v)
3132 if (sx.peer_offered & OPTION_CHUNKING)
3133 debug_printf(" will write message using CHUNKING\n");
3134 else
3135 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3136 transport_count = 0;
3137
3138 #ifndef DISABLE_DKIM
3139 dkim_exim_sign_init();
3140 # ifdef EXPERIMENTAL_ARC
3141 {
3142 uschar * s = sx.ob->arc_sign;
3143 if (s)
3144 {
3145 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3146 {
3147 if (!f.expand_string_forcedfail)
3148 {
3149 message = US"failed to expand arc_sign";
3150 sx.ok = FALSE;
3151 goto SEND_FAILED;
3152 }
3153 }
3154 else if (*s)
3155 {
3156 /* Ask dkim code to hash the body for ARC */
3157 (void) arc_ams_setup_sign_bodyhash();
3158 sx.ob->dkim.force_bodyhash = TRUE;
3159 }
3160 }
3161 }
3162 # endif
3163 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3164 #else
3165 sx.ok = transport_write_message(&tctx, 0);
3166 #endif
3167
3168 /* transport_write_message() uses write() because it is called from other
3169 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3170 it can exit with "Broken pipe" as its error. This really means that the
3171 socket got closed at the far end. */
3172
3173 transport_write_timeout = 0; /* for subsequent transports */
3174
3175 /* Failure can either be some kind of I/O disaster (including timeout),
3176 or the failure of a transport filter or the expansion of added headers.
3177 Or, when CHUNKING, it can be a protocol-detected failure. */
3178
3179 if (!sx.ok)
3180 if (message) goto SEND_FAILED;
3181 else goto RESPONSE_FAILED;
3182
3183 /* We used to send the terminating "." explicitly here, but because of
3184 buffering effects at both ends of TCP/IP connections, you don't gain
3185 anything by keeping it separate, so it might as well go in the final
3186 data buffer for efficiency. This is now done by setting the topt_end_dot
3187 flag above. */
3188
3189 smtp_command = US"end of data";
3190
3191 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3192 {
3193 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3194 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3195 {
3196 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3197 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3198 break;
3199
3200 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3201 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3202 case 0: break; /* No 2xx or 5xx, but no probs */
3203
3204 case -1: goto END_OFF; /* Timeout on RCPT */
3205 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3206 }
3207 }
3208
3209 #ifndef DISABLE_PRDR
3210 /* For PRDR we optionally get a partial-responses warning
3211 * followed by the individual responses, before going on with
3212 * the overall response. If we don't get the warning then deal
3213 * with per non-PRDR. */
3214 if(sx.prdr_active)
3215 {
3216 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3',
3217 sx.ob->final_timeout);
3218 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3219 {
3220 case '2': sx.prdr_active = FALSE;
3221 sx.ok = TRUE;
3222 break;
3223 case '4': errno = ERRNO_DATA4XX;
3224 addrlist->more_errno |=
3225 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3226 break;
3227 }
3228 }
3229 else
3230 #endif
3231
3232 /* For non-PRDR SMTP, we now read a single response that applies to the
3233 whole message. If it is OK, then all the addresses have been delivered. */
3234
3235 if (!sx.lmtp)
3236 {
3237 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3238 sx.ob->final_timeout);
3239 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3240 {
3241 errno = ERRNO_DATA4XX;
3242 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3243 }
3244 }
3245
3246 /* For LMTP, we get back a response for every RCPT command that we sent;
3247 some may be accepted and some rejected. For those that get a response, their
3248 status is fixed; any that are accepted have been handed over, even if later
3249 responses crash - at least, that's how I read RFC 2033.
3250
3251 If all went well, mark the recipient addresses as completed, record which
3252 host/IPaddress they were delivered to, and cut out RSET when sending another
3253 message down the same channel. Write the completed addresses to the journal
3254 now so that they are recorded in case there is a crash of hardware or
3255 software before the spool gets updated. Also record the final SMTP
3256 confirmation if needed (for SMTP only). */
3257
3258 if (sx.ok)
3259 {
3260 int flag = '=';
3261 struct timeval delivery_time;
3262 int len;
3263 uschar * conf = NULL;
3264
3265 timesince(&delivery_time, &start_delivery_time);
3266 sx.send_rset = FALSE;
3267 pipelining_active = FALSE;
3268
3269 /* Set up confirmation if needed - applies only to SMTP */
3270
3271 if (
3272 #ifdef DISABLE_EVENT
3273 LOGGING(smtp_confirmation) &&
3274 #endif
3275 !sx.lmtp
3276 )
3277 {
3278 const uschar *s = string_printing(sx.buffer);
3279 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3280 conf = (s == sx.buffer)? US string_copy(s) : US s;
3281 }
3282
3283 /* Process all transported addresses - for LMTP or PRDR, read a status for
3284 each one. */
3285
3286 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3287 {
3288 if (addr->transport_return != PENDING_OK) continue;
3289
3290 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3291 remaining addresses. Otherwise, it's a return code for just the one
3292 address. For temporary errors, add a retry item for the address so that
3293 it doesn't get tried again too soon. */
3294
3295 #ifndef DISABLE_PRDR
3296 if (sx.lmtp || sx.prdr_active)
3297 #else
3298 if (sx.lmtp)
3299 #endif
3300 {
3301 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3302 sx.ob->final_timeout))
3303 {
3304 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3305 addr->message = string_sprintf(
3306 #ifndef DISABLE_PRDR
3307 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3308 #else
3309 "LMTP error after %s: %s",
3310 #endif
3311 data_command, string_printing(sx.buffer));
3312 setflag(addr, af_pass_message); /* Allow message to go to user */
3313 if (sx.buffer[0] == '5')
3314 addr->transport_return = FAIL;
3315 else
3316 {
3317 errno = ERRNO_DATA4XX;
3318 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3319 addr->transport_return = DEFER;
3320 #ifndef DISABLE_PRDR
3321 if (!sx.prdr_active)
3322 #endif
3323 retry_add_item(addr, addr->address_retry_key, 0);
3324 }
3325 continue;
3326 }
3327 sx.completed_addr = TRUE; /* NOW we can set this flag */
3328 if (LOGGING(smtp_confirmation))
3329 {
3330 const uschar *s = string_printing(sx.buffer);
3331 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3332 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3333 }
3334 }
3335
3336 /* SMTP, or success return from LMTP for this address. Pass back the
3337 actual host that was used. */
3338
3339 addr->transport_return = OK;
3340 addr->more_errno = delivery_time.tv_sec;
3341 addr->delivery_usec = delivery_time.tv_usec;
3342 addr->host_used = host;
3343 addr->special_action = flag;
3344 addr->message = conf;
3345
3346 if (sx.pipelining_used) setflag(addr, af_pipelining);
3347 #ifndef DISABLE_PRDR
3348 if (sx.prdr_active) setflag(addr, af_prdr_used);
3349 #endif
3350 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3351 flag = '-';
3352
3353 #ifndef DISABLE_PRDR
3354 if (!sx.prdr_active)
3355 #endif
3356 {
3357 /* Update the journal. For homonymic addresses, use the base address plus
3358 the transport name. See lots of comments in deliver.c about the reasons
3359 for the complications when homonyms are involved. Just carry on after
3360 write error, as it may prove possible to update the spool file later. */
3361
3362 if (testflag(addr, af_homonym))
3363 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3364 else
3365 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3366
3367 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3368 len = Ustrlen(CS sx.buffer);
3369 if (write(journal_fd, sx.buffer, len) != len)
3370 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3371 "%s: %s", sx.buffer, strerror(errno));
3372 }
3373 }
3374
3375 #ifndef DISABLE_PRDR
3376 if (sx.prdr_active)
3377 {
3378 const uschar * overall_message;
3379
3380 /* PRDR - get the final, overall response. For any non-success
3381 upgrade all the address statuses. */
3382
3383 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3384 sx.ob->final_timeout);
3385 if (!sx.ok)
3386 {
3387 if(errno == 0 && sx.buffer[0] == '4')
3388 {
3389 errno = ERRNO_DATA4XX;
3390 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3391 }
3392 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3393 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3394 addr->transport_return = PENDING_OK; /* allow set_errno action */
3395 goto RESPONSE_FAILED;
3396 }
3397
3398 /* Append the overall response to the individual PRDR response for logging
3399 and update the journal, or setup retry. */
3400
3401 overall_message = string_printing(sx.buffer);
3402 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3403 if (addr->transport_return == OK)
3404 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3405
3406 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3407 if (addr->transport_return == OK)
3408 {
3409 if (testflag(addr, af_homonym))
3410 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3411 else
3412 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3413
3414 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3415 len = Ustrlen(CS sx.buffer);
3416 if (write(journal_fd, sx.buffer, len) != len)
3417 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3418 "%s: %s", sx.buffer, strerror(errno));
3419 }
3420 else if (addr->transport_return == DEFER)
3421 retry_add_item(addr, addr->address_retry_key, -2);
3422 }
3423 #endif
3424
3425 /* Ensure the journal file is pushed out to disk. */
3426
3427 if (EXIMfsync(journal_fd) < 0)
3428 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3429 strerror(errno));
3430 }
3431 }
3432
3433
3434 /* Handle general (not specific to one address) failures here. The value of ok
3435 is used to skip over this code on the falling through case. A timeout causes a
3436 deferral. Other errors may defer or fail according to the response code, and
3437 may set up a special errno value, e.g. after connection chopped, which is
3438 assumed if errno == 0 and there is no text in the buffer. If control reaches
3439 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3440 the problem is not related to this specific message. */
3441
3442 if (!sx.ok)
3443 {
3444 int code, set_rc;
3445 uschar * set_message;
3446
3447 RESPONSE_FAILED:
3448 {
3449 save_errno = errno;
3450 message = NULL;
3451 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3452 sx.buffer, &code, &message, &pass_message);
3453 goto FAILED;
3454 }
3455
3456 SEND_FAILED:
3457 {
3458 save_errno = errno;
3459 code = '4';
3460 message = string_sprintf("send() to %s [%s] failed: %s",
3461 host->name, host->address, message ? message : US strerror(save_errno));
3462 sx.send_quit = FALSE;
3463 goto FAILED;
3464 }
3465
3466 FAILED:
3467 {
3468 BOOL message_error;
3469
3470 sx.ok = FALSE; /* For when reached by GOTO */
3471 set_message = message;
3472
3473 /* We want to handle timeouts after MAIL or "." and loss of connection after
3474 "." specially. They can indicate a problem with the sender address or with
3475 the contents of the message rather than a real error on the connection. These
3476 cases are treated in the same way as a 4xx response. This next bit of code
3477 does the classification. */
3478
3479 switch(save_errno)
3480 {
3481 case 0:
3482 case ERRNO_MAIL4XX:
3483 case ERRNO_DATA4XX:
3484 message_error = TRUE;
3485 break;
3486
3487 case ETIMEDOUT:
3488 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3489 Ustrncmp(smtp_command,"end ",4) == 0;
3490 break;
3491
3492 case ERRNO_SMTPCLOSED:
3493 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3494 break;
3495
3496 default:
3497 message_error = FALSE;
3498 break;
3499 }
3500
3501 /* Handle the cases that are treated as message errors. These are:
3502
3503 (a) negative response or timeout after MAIL
3504 (b) negative response after DATA
3505 (c) negative response or timeout or dropped connection after "."
3506 (d) utf8 support required and not offered
3507
3508 It won't be a negative response or timeout after RCPT, as that is dealt
3509 with separately above. The action in all cases is to set an appropriate
3510 error code for all the addresses, but to leave yield set to OK because the
3511 host itself has not failed. Of course, it might in practice have failed
3512 when we've had a timeout, but if so, we'll discover that at the next
3513 delivery attempt. For a temporary error, set the message_defer flag, and
3514 write to the logs for information if this is not the last host. The error
3515 for the last host will be logged as part of the address's log line. */
3516
3517 if (message_error)
3518 {
3519 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3520
3521 /* If there's an errno, the message contains just the identity of
3522 the host. */
3523
3524 if (code == '5')
3525 set_rc = FAIL;
3526 else /* Anything other than 5 is treated as temporary */
3527 {
3528 set_rc = DEFER;
3529 if (save_errno > 0)
3530 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3531
3532 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3533
3534 *message_defer = TRUE;
3535 }
3536 }
3537
3538 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3539 ".", or some other transportation error. We defer all addresses and yield
3540 DEFER, except for the case of failed add_headers expansion, or a transport
3541 filter failure, when the yield should be ERROR, to stop it trying other
3542 hosts. */
3543
3544 else
3545 {
3546 set_rc = DEFER;
3547 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3548 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3549 }
3550 }
3551
3552 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3553 #ifdef EXPERIMENTAL_DSN_INFO
3554 , sx.smtp_greeting, sx.helo_response
3555 #endif
3556 );
3557 }
3558
3559
3560 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3561 SMTP session tidily. However, if there were too many addresses to send in one
3562 message (indicated by first_addr being non-NULL) we want to carry on with the
3563 rest of them. Also, it is desirable to send more than one message down the SMTP
3564 connection if there are several waiting, provided we haven't already sent so
3565 many as to hit the configured limit. The function transport_check_waiting looks
3566 for a waiting message and returns its id. Then transport_pass_socket tries to
3567 set up a continued delivery by passing the socket on to another process. The
3568 variable send_rset is FALSE if a message has just been successfully transfered.
3569
3570 If we are already sending down a continued channel, there may be further
3571 addresses not yet delivered that are aimed at the same host, but which have not
3572 been passed in this run of the transport. In this case, continue_more will be
3573 true, and all we should do is send RSET if necessary, and return, leaving the
3574 channel open.
3575
3576 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3577 do not want to continue with other messages down the same channel, because that
3578 can lead to looping between two or more messages, all with the same,
3579 temporarily failing address(es). [The retry information isn't updated yet, so
3580 new processes keep on trying.] We probably also don't want to try more of this
3581 message's addresses either.
3582
3583 If we have started a TLS session, we have to end it before passing the
3584 connection to a new process. However, not all servers can handle this (Exim
3585 can), so we do not pass such a connection on if the host matches
3586 hosts_nopass_tls. */
3587
3588 DEBUG(D_transport)
3589 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3590 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3591 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
3592
3593 if (sx.completed_addr && sx.ok && sx.send_quit)
3594 {
3595 BOOL more;
3596 smtp_compare_t t_compare;
3597
3598 t_compare.tblock = tblock;
3599 t_compare.current_sender_address = sender_address;
3600
3601 if ( sx.first_addr != NULL
3602 || f.continue_more
3603 || (
3604 #ifdef SUPPORT_TLS
3605 ( tls_out.active.sock < 0 && !continue_proxy_cipher
3606 || verify_check_given_host(CUSS &sx.ob->hosts_nopass_tls, host) != OK
3607 )
3608 &&
3609 #endif
3610 transport_check_waiting(tblock->name, host->name,
3611 tblock->connection_max_messages, new_message_id, &more,
3612 (oicf)smtp_are_same_identities, (void*)&t_compare)
3613 ) )
3614 {
3615 uschar *msg;
3616 BOOL pass_message;
3617
3618 if (sx.send_rset)
3619 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
3620 {
3621 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3622 host->address, strerror(errno));
3623 sx.send_quit = FALSE;
3624 }
3625 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer,
3626 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3627 {
3628 int code;
3629 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3630 &pass_message);
3631 if (!sx.send_quit)
3632 {
3633 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3634 host->name, host->address, msg);
3635 }
3636 }
3637
3638 /* Either RSET was not needed, or it succeeded */
3639
3640 if (sx.ok)
3641 {
3642 #ifdef SUPPORT_TLS
3643 int pfd[2];
3644 #endif
3645 int socket_fd = sx.cctx.sock;
3646
3647
3648 if (sx.first_addr != NULL) /* More addresses still to be sent */
3649 { /* in this run of the transport */
3650 continue_sequence++; /* Causes * in logging */
3651 goto SEND_MESSAGE;
3652 }
3653
3654 /* Unless caller said it already has more messages listed for this host,
3655 pass the connection on to a new Exim process (below, the call to
3656 transport_pass_socket). If the caller has more ready, just return with
3657 the connection still open. */
3658
3659 #ifdef SUPPORT_TLS
3660 if (tls_out.active.sock >= 0)
3661 if ( f.continue_more
3662 || verify_check_given_host(CUSS &sx.ob->hosts_noproxy_tls, host) == OK)
3663 {
3664 /* Before passing the socket on, or returning to caller with it still
3665 open, we must shut down TLS. Not all MTAs allow for the continuation
3666 of the SMTP session when TLS is shut down. We test for this by sending
3667 a new EHLO. If we don't get a good response, we don't attempt to pass
3668 the socket on. */
3669
3670 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
3671 sx.cctx.tls_ctx = NULL;
3672 smtp_peer_options = smtp_peer_options_wrap;
3673 sx.ok = !sx.smtps
3674 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
3675 >= 0
3676 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
3677 '2', sx.ob->command_timeout);
3678
3679 if (sx.ok && f.continue_more)
3680 return yield; /* More addresses for another run */
3681 }
3682 else
3683 {
3684 /* Set up a pipe for proxying TLS for the new transport process */
3685
3686 smtp_peer_options |= OPTION_TLS;
3687 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3688 socket_fd = pfd[1];
3689 else
3690 set_errno(sx.first_addr, errno, US"internal allocation problem",
3691 DEFER, FALSE, host
3692 # ifdef EXPERIMENTAL_DSN_INFO
3693 , sx.smtp_greeting, sx.helo_response
3694 # endif
3695 );
3696 }
3697 else
3698 #endif
3699 if (f.continue_more)
3700 return yield; /* More addresses for another run */
3701
3702 /* If the socket is successfully passed, we mustn't send QUIT (or
3703 indeed anything!) from here. */
3704
3705 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3706 propagate it from the initial
3707 */
3708 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3709 host->address, new_message_id, socket_fd))
3710 {
3711 sx.send_quit = FALSE;
3712
3713 /* We have passed the client socket to a fresh transport process.
3714 If TLS is still active, we need to proxy it for the transport we
3715 just passed the baton to. Fork a child to to do it, and return to
3716 get logging done asap. Which way to place the work makes assumptions
3717 about post-fork prioritisation which may not hold on all platforms. */
3718 #ifdef SUPPORT_TLS
3719 if (tls_out.active.sock >= 0)
3720 {
3721 int pid = fork();
3722 if (pid == 0) /* child; fork again to disconnect totally */
3723 {
3724 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3725 /* does not return */
3726 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
3727 sx.ob->command_timeout);
3728 }
3729
3730 if (pid > 0) /* parent */
3731 {
3732 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3733 close(pfd[0]);
3734 /* tidy the inter-proc to disconn the proxy proc */
3735 waitpid(pid, NULL, 0);
3736 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
3737 sx.cctx.tls_ctx = NULL;
3738 (void)close(sx.cctx.sock);
3739 sx.cctx.sock = -1;
3740 continue_transport = NULL;
3741 continue_hostname = NULL;
3742 return yield;
3743 }
3744 log_write(0, LOG_PANIC_DIE, "fork failed");
3745 }
3746 #endif
3747 }
3748 }
3749
3750 /* If RSET failed and there are addresses left, they get deferred. */
3751 else
3752 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3753 #ifdef EXPERIMENTAL_DSN_INFO
3754 , sx.smtp_greeting, sx.helo_response
3755 #endif
3756 );
3757 }
3758 }
3759
3760 /* End off tidily with QUIT unless the connection has died or the socket has
3761 been passed to another process. There has been discussion on the net about what
3762 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3763 to wait for a response, but on the other hand, there isn't anything one can do
3764 with an error response, other than log it. Exim used to do that. However,
3765 further discussion suggested that it is positively advantageous not to wait for
3766 the response, but to close the session immediately. This is supposed to move
3767 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3768 load from the server. (Hosts that are both servers and clients may not see much
3769 difference, of course.) Further discussion indicated that this was safe to do
3770 on Unix systems which have decent implementations of TCP/IP that leave the
3771 connection around for a while (TIME_WAIT) after the application has gone away.
3772 This enables the response sent by the server to be properly ACKed rather than
3773 timed out, as can happen on broken TCP/IP implementations on other OS.
3774
3775 This change is being made on 31-Jul-98. After over a year of trouble-free
3776 operation, the old commented-out code was removed on 17-Sep-99. */
3777
3778 SEND_QUIT:
3779 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
3780
3781 END_OFF:
3782
3783 #ifdef SUPPORT_TLS
3784 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3785 sx.cctx.tls_ctx = NULL;
3786 #endif
3787
3788 /* Close the socket, and return the appropriate value, first setting
3789 works because the NULL setting is passed back to the calling process, and
3790 remote_max_parallel is forced to 1 when delivering over an existing connection,
3791
3792 If all went well and continue_more is set, we shouldn't actually get here if
3793 there are further addresses, as the return above will be taken. However,
3794 writing RSET might have failed, or there may be other addresses whose hosts are
3795 specified in the transports, and therefore not visible at top level, in which
3796 case continue_more won't get set. */
3797
3798 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3799 if (sx.send_quit)
3800 {
3801 shutdown(sx.cctx.sock, SHUT_WR);
3802 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3803 for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3804 rc--; /* drain socket */
3805 }
3806 (void)close(sx.cctx.sock);
3807
3808 #ifndef DISABLE_EVENT
3809 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3810 #endif
3811
3812 continue_transport = NULL;
3813 continue_hostname = NULL;
3814 return yield;
3815 }
3816
3817
3818
3819
3820 /*************************************************
3821 * Closedown entry point *
3822 *************************************************/
3823
3824 /* This function is called when exim is passed an open smtp channel
3825 from another incarnation, but the message which it has been asked
3826 to deliver no longer exists. The channel is on stdin.
3827
3828 We might do fancy things like looking for another message to send down
3829 the channel, but if the one we sought has gone, it has probably been
3830 delivered by some other process that itself will seek further messages,
3831 so just close down our connection.
3832
3833 Argument: pointer to the transport instance block
3834 Returns: nothing
3835 */
3836
3837 void
3838 smtp_transport_closedown(transport_instance *tblock)
3839 {
3840 smtp_transport_options_block *ob =
3841 (smtp_transport_options_block *)tblock->options_block;
3842 client_conn_ctx cctx;
3843 smtp_context sx;
3844 uschar buffer[256];
3845 uschar inbuffer[4096];
3846 uschar outbuffer[16];
3847
3848 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
3849 cctx.sock = fileno(stdin);
3850 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
3851
3852 sx.inblock.cctx = &cctx;
3853 sx.inblock.buffer = inbuffer;
3854 sx.inblock.buffersize = sizeof(inbuffer);
3855 sx.inblock.ptr = inbuffer;
3856 sx.inblock.ptrend = inbuffer;
3857
3858 sx.outblock.cctx = &cctx;
3859 sx.outblock.buffersize = sizeof(outbuffer);
3860 sx.outblock.buffer = outbuffer;
3861 sx.outblock.ptr = outbuffer;
3862 sx.outblock.cmd_count = 0;
3863 sx.outblock.authenticating = FALSE;
3864
3865 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
3866 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
3867 (void)close(cctx.sock);
3868 }
3869
3870
3871
3872 /*************************************************
3873 * Prepare addresses for delivery *
3874 *************************************************/
3875
3876 /* This function is called to flush out error settings from previous delivery
3877 attempts to other hosts. It also records whether we got here via an MX record
3878 or not in the more_errno field of the address. We are interested only in
3879 addresses that are still marked DEFER - others may have got delivered to a
3880 previously considered IP address. Set their status to PENDING_DEFER to indicate
3881 which ones are relevant this time.
3882
3883 Arguments:
3884 addrlist the list of addresses
3885 host the host we are delivering to
3886
3887 Returns: the first address for this delivery
3888 */
3889
3890 static address_item *
3891 prepare_addresses(address_item *addrlist, host_item *host)
3892 {
3893 address_item *first_addr = NULL;
3894 address_item *addr;
3895 for (addr = addrlist; addr; addr = addr->next)
3896 if (addr->transport_return == DEFER)
3897 {
3898 if (!first_addr) first_addr = addr;
3899 addr->transport_return = PENDING_DEFER;
3900 addr->basic_errno = 0;
3901 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3902 addr->message = NULL;
3903 #ifdef SUPPORT_TLS
3904 addr->cipher = NULL;
3905 addr->ourcert = NULL;
3906 addr->peercert = NULL;
3907 addr->peerdn = NULL;
3908 addr->ocsp = OCSP_NOT_REQ;
3909 #endif
3910 #ifdef EXPERIMENTAL_DSN_INFO
3911 addr->smtp_greeting = NULL;
3912 addr->helo_response = NULL;
3913 #endif
3914 }
3915 return first_addr;
3916 }
3917
3918
3919
3920 /*************************************************
3921 * Main entry point *
3922 *************************************************/
3923
3924 /* See local README for interface details. As this is a remote transport, it is
3925 given a chain of addresses to be delivered in one connection, if possible. It
3926 always returns TRUE, indicating that each address has its own independent
3927 status set, except if there is a setting up problem, in which case it returns
3928 FALSE. */
3929
3930 BOOL
3931 smtp_transport_entry(
3932 transport_instance *tblock, /* data for this instantiation */
3933 address_item *addrlist) /* addresses we are working on */
3934 {
3935 int cutoff_retry;
3936 int defport;
3937 int hosts_defer = 0;
3938 int hosts_fail = 0;
3939 int hosts_looked_up = 0;
3940 int hosts_retry = 0;
3941 int hosts_serial = 0;
3942 int hosts_total = 0;
3943 int total_hosts_tried = 0;
3944 address_item *addr;
3945 BOOL expired = TRUE;
3946 uschar *expanded_hosts = NULL;
3947 uschar *pistring;
3948 uschar *tid = string_sprintf("%s transport", tblock->name);
3949 smtp_transport_options_block *ob =
3950 (smtp_transport_options_block *)(tblock->options_block);
3951 host_item *hostlist = addrlist->host_list;
3952 host_item *host;
3953
3954 DEBUG(D_transport)
3955 {
3956 debug_printf("%s transport entered\n", tblock->name);
3957 for (addr = addrlist; addr; addr = addr->next)
3958 debug_printf(" %s\n", addr->address);
3959 if (hostlist)
3960 {
3961 debug_printf("hostlist:\n");
3962 for (host = hostlist; host; host = host->next)
3963 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3964 }
3965 if (continue_hostname)
3966 debug_printf("already connected to %s [%s] (on fd %d)\n",
3967 continue_hostname, continue_host_address,
3968 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
3969 }
3970
3971 /* Set the flag requesting that these hosts be added to the waiting
3972 database if the delivery fails temporarily or if we are running with
3973 queue_smtp or a 2-stage queue run. This gets unset for certain
3974 kinds of error, typically those that are specific to the message. */
3975
3976 update_waiting = TRUE;
3977
3978 /* If a host list is not defined for the addresses - they must all have the
3979 same one in order to be passed to a single transport - or if the transport has
3980 a host list with hosts_override set, use the host list supplied with the
3981 transport. It is an error for this not to exist. */
3982
3983 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3984 if (tls_requiretls & REQUIRETLS_MSG)
3985 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
3986 rather than modifying the transport? */
3987 #endif
3988
3989 if (!hostlist || (ob->hosts_override && ob->hosts))
3990 {
3991 if (!ob->hosts)
3992 {
3993 addrlist->message = string_sprintf("%s transport called with no hosts set",
3994 tblock->name);
3995 addrlist->transport_return = PANIC;
3996 return FALSE; /* Only top address has status */
3997 }
3998
3999 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4000 ob->hosts);
4001
4002 /* If the transport's host list contains no '$' characters, and we are not
4003 randomizing, it is fixed and therefore a chain of hosts can be built once
4004 and for all, and remembered for subsequent use by other calls to this
4005 transport. If, on the other hand, the host list does contain '$', or we are
4006 randomizing its order, we have to rebuild it each time. In the fixed case,
4007 as the hosts string will never be used again, it doesn't matter that we
4008 replace all the : characters with zeros. */
4009
4010 if (!ob->hostlist)
4011 {
4012 uschar *s = ob->hosts;
4013
4014 if (Ustrchr(s, '$') != NULL)
4015 {
4016 if (!(expanded_hosts = expand_string(s)))
4017 {
4018 addrlist->message = string_sprintf("failed to expand list of hosts "
4019 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4020 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4021 return FALSE; /* Only top address has status */
4022 }
4023 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4024 "\"%s\"\n", s, expanded_hosts);
4025 s = expanded_hosts;
4026 }
4027 else
4028 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4029
4030 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4031
4032 /* Check that the expansion yielded something useful. */
4033 if (!hostlist)
4034 {
4035 addrlist->message =
4036 string_sprintf("%s transport has empty hosts setting", tblock->name);
4037 addrlist->transport_return = PANIC;
4038 return FALSE; /* Only top address has status */
4039 }
4040
4041 /* If there was no expansion of hosts, save the host list for
4042 next time. */
4043
4044 if (!expanded_hosts) ob->hostlist = hostlist;
4045 }
4046
4047 /* This is not the first time this transport has been run in this delivery;
4048 the host list was built previously. */
4049
4050 else
4051 hostlist = ob->hostlist;
4052 }
4053
4054 /* The host list was supplied with the address. If hosts_randomize is set, we
4055 must sort it into a random order if it did not come from MX records and has not
4056 already been randomized (but don't bother if continuing down an existing
4057 connection). */
4058
4059 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4060 {
4061 host_item *newlist = NULL;
4062 while (hostlist)
4063 {
4064 host_item *h = hostlist;
4065 hostlist = hostlist->next;
4066
4067 h->sort_key = random_number(100);
4068
4069 if (!newlist)
4070 {
4071 h->next = NULL;
4072 newlist = h;
4073 }
4074 else if (h->sort_key < newlist->sort_key)
4075 {
4076 h->next = newlist;
4077 newlist = h;
4078 }
4079 else
4080 {
4081 host_item *hh = newlist;
4082 while (hh->next)
4083 {
4084 if (h->sort_key < hh->next->sort_key) break;
4085 hh = hh->next;
4086 }
4087 h->next = hh->next;
4088 hh->next = h;
4089 }
4090 }
4091
4092 hostlist = addrlist->host_list = newlist;
4093 }
4094
4095 /* Sort out the default port. */
4096
4097 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4098
4099 /* For each host-plus-IP-address on the list:
4100
4101 . If this is a continued delivery and the host isn't the one with the
4102 current connection, skip.
4103
4104 . If the status is unusable (i.e. previously failed or retry checked), skip.
4105
4106 . If no IP address set, get the address, either by turning the name into
4107 an address, calling gethostbyname if gethostbyname is on, or by calling
4108 the DNS. The DNS may yield multiple addresses, in which case insert the
4109 extra ones into the list.
4110
4111 . Get the retry data if not previously obtained for this address and set the
4112 field which remembers the state of this address. Skip if the retry time is
4113 not reached. If not, remember whether retry data was found. The retry string
4114 contains both the name and the IP address.
4115
4116 . Scan the list of addresses and mark those whose status is DEFER as
4117 PENDING_DEFER. These are the only ones that will be processed in this cycle
4118 of the hosts loop.
4119
4120 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4121 Some addresses may be successfully delivered, others may fail, and yet
4122 others may get temporary errors and so get marked DEFER.
4123
4124 . The return from the delivery attempt is OK if a connection was made and a
4125 valid SMTP dialogue was completed. Otherwise it is DEFER.
4126
4127 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4128
4129 . If fail to connect, or other defer state, add a retry item.
4130
4131 . If there are any addresses whose status is still DEFER, carry on to the
4132 next host/IPaddress, unless we have tried the number of hosts given
4133 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4134 there is some fancy logic for hosts_max_try that means its limit can be
4135 overstepped in some circumstances.
4136
4137 If we get to the end of the list, all hosts have deferred at least one address,
4138 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4139 delivery attempt to those hosts whose last try was before the arrival time of
4140 the current message. To cope with this, we have to go round the loop a second
4141 time. After that, set the status and error data for any addresses that haven't
4142 had it set already. */
4143
4144 for (cutoff_retry = 0;
4145 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4146 cutoff_retry++)
4147 {
4148 host_item *nexthost = NULL;
4149 int unexpired_hosts_tried = 0;
4150 BOOL continue_host_tried = FALSE;
4151
4152 retry_non_continued:
4153 for (host = hostlist;
4154 host
4155 && unexpired_hosts_tried < ob->hosts_max_try
4156 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4157 host = nexthost)
4158 {
4159 int rc;
4160 int host_af;
4161 uschar *rs;
4162 BOOL host_is_expired = FALSE;
4163 BOOL message_defer = FALSE;
4164 BOOL some_deferred = FALSE;
4165 address_item *first_addr = NULL;
4166 uschar *interface = NULL;
4167 uschar *retry_host_key = NULL;
4168 uschar *retry_message_key = NULL;
4169 uschar *serialize_key = NULL;
4170
4171 /* Default next host is next host. :-) But this can vary if the
4172 hosts_max_try limit is hit (see below). It may also be reset if a host
4173 address is looked up here (in case the host was multihomed). */
4174
4175 nexthost = host->next;
4176
4177 /* If the address hasn't yet been obtained from the host name, look it up
4178 now, unless the host is already marked as unusable. If it is marked as
4179 unusable, it means that the router was unable to find its IP address (in
4180 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4181 the lookup failed last time. We don't get this far if *all* MX records
4182 point to non-existent hosts; that is treated as a hard error.
4183
4184 We can just skip this host entirely. When the hosts came from the router,
4185 the address will timeout based on the other host(s); when the address is
4186 looked up below, there is an explicit retry record added.
4187
4188 Note that we mustn't skip unusable hosts if the address is not unset; they
4189 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4190
4191 if (!host->address)
4192 {
4193 int new_port, flags;
4194 host_item *hh;
4195
4196 if (host->status >= hstatus_unusable)
4197 {
4198 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4199 host->name);
4200 continue;
4201 }
4202
4203 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4204
4205 /* The host name is permitted to have an attached port. Find it, and
4206 strip it from the name. Just remember it for now. */
4207
4208 new_port = host_item_get_port(host);
4209
4210 /* Count hosts looked up */
4211
4212 hosts_looked_up++;
4213
4214 /* Find by name if so configured, or if it's an IP address. We don't
4215 just copy the IP address, because we need the test-for-local to happen. */
4216
4217 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4218 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4219 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4220
4221 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4222 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4223 else
4224 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4225 &ob->dnssec, /* domains for request/require */
4226 NULL, NULL);
4227
4228 /* Update the host (and any additional blocks, resulting from
4229 multihoming) with a host-specific port, if any. */
4230
4231 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4232
4233 /* Failure to find the host at this time (usually DNS temporary failure)
4234 is really a kind of routing failure rather than a transport failure.
4235 Therefore we add a retry item of the routing kind, not to stop us trying
4236 to look this name up here again, but to ensure the address gets timed
4237 out if the failures go on long enough. A complete failure at this point
4238 commonly points to a configuration error, but the best action is still
4239 to carry on for the next host. */
4240
4241 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4242 {
4243 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4244 expired = FALSE;
4245 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4246 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4247 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4248 host->status = hstatus_unusable;
4249
4250 for (addr = addrlist; addr; addr = addr->next)
4251 {
4252 if (addr->transport_return != DEFER) continue;
4253 addr->basic_errno = ERRNO_UNKNOWNHOST;
4254 addr->message = string_sprintf(
4255 rc == HOST_FIND_SECURITY
4256 ? "lookup of IP address for %s was insecure"
4257 : "failed to lookup IP address for %s",
4258 host->name);
4259 }
4260 continue;
4261 }
4262
4263 /* If the host is actually the local host, we may have a problem, or
4264 there may be some cunning configuration going on. In the problem case,
4265 log things and give up. The default transport status is already DEFER. */
4266
4267 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4268 {
4269 for (addr = addrlist; addr; addr = addr->next)
4270 {
4271 addr->basic_errno = 0;
4272 addr->message = string_sprintf("%s transport found host %s to be "
4273 "local", tblock->name, host->name);
4274 }
4275 goto END_TRANSPORT;
4276 }
4277 } /* End of block for IP address lookup */
4278
4279 /* If this is a continued delivery, we are interested only in the host
4280 which matches the name of the existing open channel. The check is put
4281 here after the local host lookup, in case the name gets expanded as a
4282 result of the lookup. Set expired FALSE, to save the outer loop executing
4283 twice. */
4284
4285 if (continue_hostname)
4286 if ( Ustrcmp(continue_hostname, host->name) != 0
4287 || Ustrcmp(continue_host_address, host->address) != 0
4288 )
4289 {
4290 expired = FALSE;
4291 continue; /* With next host */
4292 }
4293 else
4294 continue_host_tried = TRUE;
4295
4296 /* Reset the default next host in case a multihomed host whose addresses
4297 are not looked up till just above added to the host list. */
4298
4299 nexthost = host->next;
4300
4301 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4302 domain is in queue_smtp_domains, we don't actually want to attempt any
4303 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4304 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4305 were not in it. We don't want to hold up all SMTP deliveries! Except when
4306 doing a two-stage queue run, don't do this if forcing. */
4307
4308 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4309 match_isinlist(addrlist->domain,
4310 (const uschar **)&queue_smtp_domains, 0,
4311 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4312 {
4313 expired = FALSE;
4314 for (addr = addrlist; addr; addr = addr->next)
4315 if (addr->transport_return == DEFER)
4316 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4317 continue; /* With next host */
4318 }
4319
4320 /* Count hosts being considered - purely for an intelligent comment
4321 if none are usable. */
4322
4323 hosts_total++;
4324
4325 /* Set $host and $host address now in case they are needed for the
4326 interface expansion or the serialize_hosts check; they remain set if an
4327 actual delivery happens. */
4328
4329 deliver_host = host->name;
4330 deliver_host_address = host->address;
4331 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4332 : host->dnssec == DS_NO ? US"no"
4333 : US"";
4334
4335 /* Set up a string for adding to the retry key if the port number is not
4336 the standard SMTP port. A host may have its own port setting that overrides
4337 the default. */
4338
4339 pistring = string_sprintf(":%d", host->port == PORT_NONE
4340 ? defport : host->port);
4341 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4342
4343 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4344 string is set, even if constant (as different transports can have different
4345 constant settings), we must add it to the key that is used for retries,
4346 because connections to the same host from a different interface should be
4347 treated separately. */
4348
4349 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4350 if ((rs = ob->interface) && *rs)
4351 {
4352 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4353 return FALSE;
4354 pistring = string_sprintf("%s/%s", pistring, interface);
4355 }
4356
4357 /* The first time round the outer loop, check the status of the host by
4358 inspecting the retry data. The second time round, we are interested only
4359 in expired hosts that haven't been tried since this message arrived. */
4360
4361 if (cutoff_retry == 0)
4362 {
4363 BOOL incl_ip;
4364 /* Ensure the status of the address is set by checking retry data if
4365 necessary. There may be host-specific retry data (applicable to all
4366 messages) and also data for retries of a specific message at this host.
4367 If either of these retry records are actually read, the keys used are
4368 returned to save recomputing them later. */
4369
4370 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4371 US"retry_include_ip_address", ob->retry_include_ip_address,
4372 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4373 continue; /* with next host */
4374
4375 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4376 incl_ip, &retry_host_key, &retry_message_key);
4377
4378 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4379 (host->address == NULL)? US"" : host->address, pistring,
4380 (host->status == hstatus_usable)? "usable" :
4381 (host->status == hstatus_unusable)? "unusable" :
4382 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4383
4384 /* Skip this address if not usable at this time, noting if it wasn't
4385 actually expired, both locally and in the address. */
4386
4387 switch (host->status)
4388 {
4389 case hstatus_unusable:
4390 expired = FALSE;
4391 setflag(addrlist, af_retry_skipped);
4392 /* Fall through */
4393
4394 case hstatus_unusable_expired:
4395 switch (host->why)
4396 {
4397 case hwhy_retry: hosts_retry++; break;
4398 case hwhy_failed: hosts_fail++; break;
4399 case hwhy_insecure:
4400 case hwhy_deferred: hosts_defer++; break;
4401 }
4402
4403 /* If there was a retry message key, implying that previously there
4404 was a message-specific defer, we don't want to update the list of
4405 messages waiting for these hosts. */
4406
4407 if (retry_message_key) update_waiting = FALSE;
4408 continue; /* With the next host or IP address */
4409 }
4410 }
4411
4412 /* Second time round the loop: if the address is set but expired, and
4413 the message is newer than the last try, let it through. */
4414
4415 else
4416 {
4417 if ( !host->address
4418 || host->status != hstatus_unusable_expired
4419 || host->last_try > received_time.tv_sec)
4420 continue;
4421 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4422 host->name, host->address, pistring);
4423 host_is_expired = TRUE;
4424 }
4425
4426 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4427 it remains TRUE only if all hosts are expired and none are actually tried.
4428 */
4429
4430 expired = FALSE;
4431
4432 /* If this host is listed as one to which access must be serialized,
4433 see if another Exim process has a connection to it, and if so, skip
4434 this host. If not, update the database to record our connection to it
4435 and remember this for later deletion. Do not do any of this if we are
4436 sending the message down a pre-existing connection. */
4437
4438 if ( !continue_hostname
4439 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4440 {
4441 serialize_key = string_sprintf("host-serialize-%s", host->name);
4442 if (!enq_start(serialize_key, 1))
4443 {
4444 DEBUG(D_transport)
4445 debug_printf("skipping host %s because another Exim process "
4446 "is connected to it\n", host->name);
4447 hosts_serial++;
4448 continue;
4449 }
4450 }
4451
4452 /* OK, we have an IP address that is not waiting for its retry time to
4453 arrive (it might be expired) OR (second time round the loop) we have an
4454 expired host that hasn't been tried since the message arrived. Have a go
4455 at delivering the message to it. First prepare the addresses by flushing
4456 out the result of previous attempts, and finding the first address that
4457 is still to be delivered. */
4458
4459 first_addr = prepare_addresses(addrlist, host);
4460
4461 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4462 message_id, host->name, host->address, addrlist->address,
4463 addrlist->next ? ", ..." : "");
4464
4465 set_process_info("delivering %s to %s [%s] (%s%s)",
4466 message_id, host->name, host->address, addrlist->address,
4467 addrlist->next ? ", ..." : "");
4468
4469 /* This is not for real; don't do the delivery. If there are
4470 any remaining hosts, list them. */
4471
4472 if (f.dont_deliver)
4473 {
4474 host_item *host2;
4475 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4476 for (addr = addrlist; addr; addr = addr->next)
4477 {
4478 addr->host_used = host;
4479 addr->special_action = '*';
4480 addr->message = US"delivery bypassed by -N option";
4481 }
4482 DEBUG(D_transport)
4483 {
4484 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4485 "*** host and remaining hosts:\n", tblock->name);
4486 for (host2 = host; host2; host2 = host2->next)
4487 debug_printf(" %s [%s]\n", host2->name,
4488 host2->address ? host2->address : US"unset");
4489 }
4490 rc = OK;
4491 }
4492
4493 /* This is for real. If the host is expired, we don't count it for
4494 hosts_max_retry. This ensures that all hosts must expire before an address
4495 is timed out, unless hosts_max_try_hardlimit (which protects against
4496 lunatic DNS configurations) is reached.
4497
4498 If the host is not expired and we are about to hit the hosts_max_retry
4499 limit, check to see if there is a subsequent hosts with a different MX
4500 value. If so, make that the next host, and don't count this one. This is a
4501 heuristic to make sure that different MXs do get tried. With a normal kind
4502 of retry rule, they would get tried anyway when the earlier hosts were
4503 delayed, but if the domain has a "retry every time" type of rule - as is
4504 often used for the the very large ISPs, that won't happen. */
4505
4506 else
4507 {
4508 host_item * thost;
4509 /* Make a copy of the host if it is local to this invocation
4510 of the transport. */
4511
4512 if (expanded_hosts)
4513 {
4514 thost = store_get(sizeof(host_item));
4515 *thost = *host;
4516 thost->name = string_copy(host->name);
4517 thost->address = string_copy(host->address);
4518 }
4519 else
4520 thost = host;
4521
4522 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4523 {
4524 host_item *h;
4525 DEBUG(D_transport)
4526 debug_printf("hosts_max_try limit reached with this host\n");
4527 for (h = host; h; h = h->next) if (h->mx != host->mx)
4528 {
4529 nexthost = h;
4530 unexpired_hosts_tried--;
4531 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4532 "and will be tried\n");
4533 break;
4534 }
4535 }
4536
4537 /* Attempt the delivery. */
4538
4539 total_hosts_tried++;
4540 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4541 &message_defer, FALSE);
4542
4543 /* Yield is one of:
4544 OK => connection made, each address contains its result;
4545 message_defer is set for message-specific defers (when all
4546 recipients are marked defer)
4547 DEFER => there was a non-message-specific delivery problem;
4548 ERROR => there was a problem setting up the arguments for a filter,
4549 or there was a problem with expanding added headers
4550 */
4551
4552 /* If the result is not OK, there was a non-message-specific problem.
4553 If the result is DEFER, we need to write to the logs saying what happened
4554 for this particular host, except in the case of authentication and TLS
4555 failures, where the log has already been written. If all hosts defer a
4556 general message is written at the end. */
4557
4558 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4559 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4560 write_logs(host, first_addr->message, first_addr->basic_errno);
4561
4562 #ifndef DISABLE_EVENT
4563 if (rc == DEFER)
4564 deferred_event_raise(first_addr, host);
4565 #endif
4566
4567 /* If STARTTLS was accepted, but there was a failure in setting up the
4568 TLS session (usually a certificate screwup), and the host is not in
4569 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4570 TLS forcibly turned off. We have to start from scratch with a new SMTP
4571 connection. That's why the retry is done from here, not from within
4572 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4573 session, so the in-clear transmission after those errors, if permitted,
4574 happens inside smtp_deliver().] */
4575
4576 #ifdef SUPPORT_TLS
4577 if ( rc == DEFER
4578 && first_addr->basic_errno == ERRNO_TLSFAILURE
4579 && ob->tls_tempfail_tryclear
4580 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
4581 )
4582 {
4583 log_write(0, LOG_MAIN,
4584 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4585 first_addr->message, host->name, host->address);
4586 first_addr = prepare_addresses(addrlist, host);
4587 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4588 &message_defer, TRUE);
4589 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4590 write_logs(host, first_addr->message, first_addr->basic_errno);
4591 # ifndef DISABLE_EVENT
4592 if (rc == DEFER)
4593 deferred_event_raise(first_addr, host);
4594 # endif
4595 }
4596 #endif /*SUPPORT_TLS*/
4597 }
4598
4599 /* Delivery attempt finished */
4600
4601 rs = rc == OK ? US"OK"
4602 : rc == DEFER ? US"DEFER"
4603 : rc == ERROR ? US"ERROR"
4604 : US"?";
4605
4606 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4607 message_id, host->name, host->address, addrlist->address,
4608 addrlist->next ? " (& others)" : "", rs);
4609
4610 /* Release serialization if set up */
4611
4612 if (serialize_key) enq_end(serialize_key);
4613
4614 /* If the result is DEFER, or if a host retry record is known to exist, we
4615 need to add an item to the retry chain for updating the retry database
4616 at the end of delivery. We only need to add the item to the top address,
4617 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4618 for any other delivery attempts using the same address. (It is copied into
4619 the unusable tree at the outer level, so even if different address blocks
4620 contain the same address, it still won't get tried again.) */
4621
4622 if (rc == DEFER || retry_host_key)
4623 {
4624 int delete_flag = rc != DEFER ? rf_delete : 0;
4625 if (!retry_host_key)
4626 {
4627 BOOL incl_ip;
4628 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4629 US"retry_include_ip_address", ob->retry_include_ip_address,
4630 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4631 incl_ip = TRUE; /* error; use most-specific retry record */
4632
4633 retry_host_key = incl_ip
4634 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4635 : string_sprintf("T:%S%s", host->name, pistring);
4636 }
4637
4638 /* If a delivery of another message over an existing SMTP connection
4639 yields DEFER, we do NOT set up retry data for the host. This covers the
4640 case when there are delays in routing the addresses in the second message
4641 that are so long that the server times out. This is alleviated by not
4642 routing addresses that previously had routing defers when handling an
4643 existing connection, but even so, this case may occur (e.g. if a
4644 previously happily routed address starts giving routing defers). If the
4645 host is genuinely down, another non-continued message delivery will
4646 notice it soon enough. */
4647
4648 if (delete_flag != 0 || !continue_hostname)
4649 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4650
4651 /* We may have tried an expired host, if its retry time has come; ensure
4652 the status reflects the expiry for the benefit of any other addresses. */
4653
4654 if (rc == DEFER)
4655 {
4656 host->status = host_is_expired
4657 ? hstatus_unusable_expired : hstatus_unusable;
4658 host->why = hwhy_deferred;
4659 }
4660 }
4661
4662 /* If message_defer is set (host was OK, but every recipient got deferred
4663 because of some message-specific problem), or if that had happened
4664 previously so that a message retry key exists, add an appropriate item
4665 to the retry chain. Note that if there was a message defer but now there is
4666 a host defer, the message defer record gets deleted. That seems perfectly
4667 reasonable. Also, stop the message from being remembered as waiting
4668 for specific hosts. */
4669
4670 if (message_defer || retry_message_key)
4671 {
4672 int delete_flag = message_defer ? 0 : rf_delete;
4673 if (!retry_message_key)
4674 {
4675 BOOL incl_ip;
4676 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4677 US"retry_include_ip_address", ob->retry_include_ip_address,
4678 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4679 incl_ip = TRUE; /* error; use most-specific retry record */
4680
4681 retry_message_key = incl_ip
4682 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4683 message_id)
4684 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4685 }
4686 retry_add_item(addrlist, retry_message_key,
4687 rf_message | rf_host | delete_flag);
4688 update_waiting = FALSE;
4689 }
4690
4691 /* Any return other than DEFER (that is, OK or ERROR) means that the
4692 addresses have got their final statuses filled in for this host. In the OK
4693 case, see if any of them are deferred. */
4694
4695 if (rc == OK)
4696 for (addr = addrlist; addr; addr = addr->next)
4697 if (addr->transport_return == DEFER)
4698 {
4699 some_deferred = TRUE;
4700 break;
4701 }
4702
4703 /* If no addresses deferred or the result was ERROR, return. We do this for
4704 ERROR because a failing filter set-up or add_headers expansion is likely to
4705 fail for any host we try. */
4706
4707 if (rc == ERROR || (rc == OK && !some_deferred))
4708 {
4709 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4710 return TRUE; /* Each address has its status */
4711 }
4712
4713 /* If the result was DEFER or some individual addresses deferred, let
4714 the loop run to try other hosts with the deferred addresses, except for the
4715 case when we were trying to deliver down an existing channel and failed.
4716 Don't try any other hosts in this case. */
4717
4718 if (continue_hostname) break;
4719
4720 /* If the whole delivery, or some individual addresses, were deferred and
4721 there are more hosts that could be tried, do not count this host towards
4722 the hosts_max_try limit if the age of the message is greater than the
4723 maximum retry time for this host. This means we may try try all hosts,
4724 ignoring the limit, when messages have been around for some time. This is
4725 important because if we don't try all hosts, the address will never time
4726 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4727
4728 if ((rc == DEFER || some_deferred) && nexthost)
4729 {
4730 BOOL timedout;
4731 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4732
4733 if (retry && retry->rules)
4734 {
4735 retry_rule *last_rule;
4736 for (last_rule = retry->rules;
4737 last_rule->next;
4738 last_rule = last_rule->next);
4739 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4740 }
4741 else timedout = TRUE; /* No rule => timed out */
4742
4743 if (timedout)
4744 {
4745 unexpired_hosts_tried--;
4746 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4747 "hosts_max_try (message older than host's retry time)\n");
4748 }
4749 }
4750 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
4751 } /* End of loop for trying multiple hosts. */
4752
4753 /* If we failed to find a matching host in the list, for an already-open
4754 connection, just close it and start over with the list. This can happen
4755 for routing that changes from run to run, or big multi-IP sites with
4756 round-robin DNS. */
4757
4758 if (continue_hostname && !continue_host_tried)
4759 {
4760 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
4761
4762 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4763 #ifdef SUPPORT_TLS
4764 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
4765 transport */
4766 /*XXX doublecheck that! */
4767
4768 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
4769 {
4770 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
4771 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4772 cutthrough.cctx.tls_ctx = NULL;
4773 cutthrough.is_tls = FALSE;
4774 }
4775 else
4776 #else
4777 (void) write(fd, US"QUIT\r\n", 6);
4778 #endif
4779 (void) close(fd);
4780 cutthrough.cctx.sock = -1;
4781 continue_hostname = NULL;
4782 goto retry_non_continued;
4783 }
4784
4785 /* This is the end of the loop that repeats iff expired is TRUE and
4786 ob->delay_after_cutoff is FALSE. The second time round we will
4787 try those hosts that haven't been tried since the message arrived. */
4788
4789 DEBUG(D_transport)
4790 {
4791 debug_printf("all IP addresses skipped or deferred at least one address\n");
4792 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4793 debug_printf("retrying IP addresses not tried since message arrived\n");
4794 }
4795 }
4796
4797
4798 /* Get here if all IP addresses are skipped or defer at least one address. In
4799 MUA wrapper mode, this will happen only for connection or other non-message-
4800 specific failures. Force the delivery status for all addresses to FAIL. */
4801
4802 if (mua_wrapper)
4803 {
4804 for (addr = addrlist; addr; addr = addr->next)
4805 addr->transport_return = FAIL;
4806 goto END_TRANSPORT;
4807 }
4808
4809 /* In the normal, non-wrapper case, add a standard message to each deferred
4810 address if there hasn't been an error, that is, if it hasn't actually been
4811 tried this time. The variable "expired" will be FALSE if any deliveries were
4812 actually tried, or if there was at least one host that was not expired. That
4813 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4814 a delivery has been tried, an error code will be set, and the failing of the
4815 message is handled by the retry code later.
4816
4817 If queue_smtp is set, or this transport was called to send a subsequent message
4818 down an existing TCP/IP connection, and something caused the host not to be
4819 found, we end up here, but can detect these cases and handle them specially. */
4820
4821 for (addr = addrlist; addr; addr = addr->next)
4822 {
4823 /* If host is not NULL, it means that we stopped processing the host list
4824 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4825 means we need to behave as if some hosts were skipped because their retry
4826 time had not come. Specifically, this prevents the address from timing out.
4827 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4828 hosts were tried. */
4829
4830 if (host)
4831 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4832 {
4833 DEBUG(D_transport)
4834 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4835 "hosts were tried\n");
4836 }
4837 else
4838 {
4839 DEBUG(D_transport)
4840 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4841 setflag(addr, af_retry_skipped);
4842 }
4843
4844 if (f.queue_smtp) /* no deliveries attempted */
4845 {
4846 addr->transport_return = DEFER;
4847 addr->basic_errno = 0;
4848 addr->message = US"SMTP delivery explicitly queued";
4849 }
4850
4851 else if ( addr->transport_return == DEFER
4852 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4853 && !addr->message
4854 )
4855 {
4856 addr->basic_errno = ERRNO_HRETRY;
4857 if (continue_hostname)
4858 addr->message = US"no host found for existing SMTP connection";
4859 else if (expired)
4860 {
4861 setflag(addr, af_pass_message); /* This is not a security risk */
4862 addr->message = string_sprintf(
4863 "all hosts%s have been failing for a long time %s",
4864 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4865 ob->delay_after_cutoff
4866 ? US"(and retry time not reached)"
4867 : US"and were last tried after this message arrived");
4868
4869 /* If we are already using fallback hosts, or there are no fallback hosts
4870 defined, convert the result to FAIL to cause a bounce. */
4871
4872 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4873 addr->transport_return = FAIL;
4874 }
4875 else
4876 {
4877 const char * s;
4878 if (hosts_retry == hosts_total)
4879 s = "retry time not reached for any host%s";
4880 else if (hosts_fail == hosts_total)
4881 s = "all host address lookups%s failed permanently";
4882 else if (hosts_defer == hosts_total)
4883 s = "all host address lookups%s failed temporarily";
4884 else if (hosts_serial == hosts_total)
4885 s = "connection limit reached for all hosts%s";
4886 else if (hosts_fail+hosts_defer == hosts_total)
4887 s = "all host address lookups%s failed";
4888 else
4889 s = "some host address lookups failed and retry time "
4890 "not reached for other hosts or connection limit reached%s";
4891
4892 addr->message = string_sprintf(s,
4893 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4894 }
4895 }
4896 }
4897
4898 /* Update the database which keeps information about which messages are waiting
4899 for which hosts to become available. For some message-specific errors, the
4900 update_waiting flag is turned off because we don't want follow-on deliveries in
4901 those cases. If this transport instance is explicitly limited to one message
4902 per connection then follow-on deliveries are not possible and there's no need
4903 to create/update the per-transport wait-<transport_name> database. */
4904
4905 if (update_waiting && tblock->connection_max_messages != 1)
4906 transport_update_waiting(hostlist, tblock->name);
4907
4908 END_TRANSPORT:
4909
4910 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4911
4912 return TRUE; /* Each address has its status */
4913 }
4914
4915 #endif /*!MACRO_PREDEF*/
4916 /* vi: aw ai sw=2
4917 */
4918 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.