projects / exim.git / blob
? search:


c1cba598c5db5ea9fede20a98edc7903dfa76259
[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 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
112 #endif
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
118 #endif
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
121 #ifdef SUPPORT_TLS
122 # ifdef SUPPORT_DANE
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
125 # endif
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
129 # endif
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
132 #endif
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
137 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
140 #endif
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
143 #ifndef DISABLE_PRDR
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
146 #endif
147 #ifdef SUPPORT_TLS
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
150 #endif
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
171 #ifdef SUPPORT_SOCKS
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
174 #endif
175 #ifdef SUPPORT_TLS
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 { "tls_sni", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_sni) },
188 { "tls_tempfail_tryclear", opt_bool,
189 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
190 { "tls_try_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
192 { "tls_verify_cert_hostnames", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
194 { "tls_verify_certificates", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
196 { "tls_verify_hosts", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
198 #endif
199 #ifdef SUPPORT_I18N
200 { "utf8_downconvert", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
202 #endif
203 };
204
205 /* Size of the options list. An extern variable has to be used so that its
206 address can appear in the tables drtables.c. */
207
208 int smtp_transport_options_count = nelem(smtp_transport_options);
209
210
211 #ifdef MACRO_PREDEF
212
213 /* Dummy values */
214 smtp_transport_options_block smtp_transport_option_defaults = {0};
215 void smtp_transport_init(transport_instance *tblock) {}
216 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
217 void smtp_transport_closedown(transport_instance *tblock) {}
218
219 #else /*!MACRO_PREDEF*/
220
221
222 /* Default private options block for the smtp transport. */
223
224 smtp_transport_options_block smtp_transport_option_defaults = {
225 .hosts = NULL,
226 .fallback_hosts = NULL,
227 .hostlist = NULL,
228 .fallback_hostlist = NULL,
229 .helo_data = US"$primary_hostname",
230 .interface = NULL,
231 .port = NULL,
232 .protocol = US"smtp",
233 .dscp = NULL,
234 .serialize_hosts = NULL,
235 .hosts_try_auth = NULL,
236 .hosts_require_auth = NULL,
237 .hosts_try_chunking = US"*",
238 #ifdef SUPPORT_DANE
239 .hosts_try_dane = NULL,
240 .hosts_require_dane = NULL,
241 .dane_require_tls_ciphers = NULL,
242 #endif
243 .hosts_try_fastopen = NULL,
244 #ifndef DISABLE_PRDR
245 .hosts_try_prdr = US"*",
246 #endif
247 #ifndef DISABLE_OCSP
248 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
249 .hosts_require_ocsp = NULL,
250 #endif
251 .hosts_require_tls = NULL,
252 .hosts_avoid_tls = NULL,
253 .hosts_verify_avoid_tls = NULL,
254 .hosts_avoid_pipelining = NULL,
255 #ifdef EXPERIMENTAL_PIPE_CONNECT
256 .hosts_pipe_connect = NULL,
257 #endif
258 .hosts_avoid_esmtp = NULL,
259 #ifdef SUPPORT_TLS
260 .hosts_nopass_tls = NULL,
261 .hosts_noproxy_tls = US"*",
262 #endif
263 .command_timeout = 5*60,
264 .connect_timeout = 5*60,
265 .data_timeout = 5*60,
266 .final_timeout = 10*60,
267 .size_addition = 1024,
268 .hosts_max_try = 5,
269 .hosts_max_try_hardlimit = 50,
270 .address_retry_include_sender = TRUE,
271 .allow_localhost = FALSE,
272 .authenticated_sender_force = FALSE,
273 .gethostbyname = FALSE,
274 .dns_qualify_single = TRUE,
275 .dns_search_parents = FALSE,
276 .dnssec = { .request=NULL, .require=NULL },
277 .delay_after_cutoff = TRUE,
278 .hosts_override = FALSE,
279 .hosts_randomize = FALSE,
280 .keepalive = TRUE,
281 .lmtp_ignore_quota = FALSE,
282 .expand_retry_include_ip_address = NULL,
283 .retry_include_ip_address = TRUE,
284 #ifdef SUPPORT_SOCKS
285 .socks_proxy = NULL,
286 #endif
287 #ifdef SUPPORT_TLS
288 .tls_certificate = NULL,
289 .tls_crl = NULL,
290 .tls_privatekey = NULL,
291 .tls_require_ciphers = NULL,
292 .tls_sni = NULL,
293 .tls_verify_certificates = US"system",
294 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
295 .tls_tempfail_tryclear = TRUE,
296 .tls_verify_hosts = NULL,
297 .tls_try_verify_hosts = US"*",
298 .tls_verify_cert_hostnames = US"*",
299 #endif
300 #ifdef SUPPORT_I18N
301 .utf8_downconvert = NULL,
302 #endif
303 #ifndef DISABLE_DKIM
304 .dkim =
305 {.dkim_domain = NULL,
306 .dkim_identity = NULL,
307 .dkim_private_key = NULL,
308 .dkim_selector = NULL,
309 .dkim_canon = NULL,
310 .dkim_sign_headers = NULL,
311 .dkim_strict = NULL,
312 .dkim_hash = US"sha256",
313 .dkim_timestamps = NULL,
314 .dot_stuffed = FALSE,
315 .force_bodyhash = FALSE,
316 # ifdef EXPERIMENTAL_ARC
317 .arc_signspec = NULL,
318 # endif
319 },
320 # ifdef EXPERIMENTAL_ARC
321 .arc_sign = NULL,
322 # endif
323 #endif
324 };
325
326 /* some DSN flags for use later */
327
328 static int rf_list[] = {rf_notify_never, rf_notify_success,
329 rf_notify_failure, rf_notify_delay };
330
331 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
332
333
334
335 /* Local statics */
336
337 static uschar *smtp_command; /* Points to last cmd for error messages */
338 static uschar *mail_command; /* Points to MAIL cmd for error messages */
339 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
340 static BOOL update_waiting; /* TRUE to update the "wait" database */
341
342 /*XXX move to smtp_context */
343 static BOOL pipelining_active; /* current transaction is in pipe mode */
344
345
346 static unsigned ehlo_response(uschar * buf, unsigned checks);
347
348
349 /*************************************************
350 * Setup entry point *
351 *************************************************/
352
353 /* This function is called when the transport is about to be used,
354 but before running it in a sub-process. It is used for two things:
355
356 (1) To set the fallback host list in addresses, when delivering.
357 (2) To pass back the interface, port, protocol, and other options, for use
358 during callout verification.
359
360 Arguments:
361 tblock pointer to the transport instance block
362 addrlist list of addresses about to be transported
363 tf if not NULL, pointer to block in which to return options
364 uid the uid that will be set (not used)
365 gid the gid that will be set (not used)
366 errmsg place for error message (not used)
367
368 Returns: OK always (FAIL, DEFER not used)
369 */
370
371 static int
372 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
373 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
374 {
375 smtp_transport_options_block *ob = SOB tblock->options_block;
376
377 errmsg = errmsg; /* Keep picky compilers happy */
378 uid = uid;
379 gid = gid;
380
381 /* Pass back options if required. This interface is getting very messy. */
382
383 if (tf)
384 {
385 tf->interface = ob->interface;
386 tf->port = ob->port;
387 tf->protocol = ob->protocol;
388 tf->hosts = ob->hosts;
389 tf->hosts_override = ob->hosts_override;
390 tf->hosts_randomize = ob->hosts_randomize;
391 tf->gethostbyname = ob->gethostbyname;
392 tf->qualify_single = ob->dns_qualify_single;
393 tf->search_parents = ob->dns_search_parents;
394 tf->helo_data = ob->helo_data;
395 }
396
397 /* Set the fallback host list for all the addresses that don't have fallback
398 host lists, provided that the local host wasn't present in the original host
399 list. */
400
401 if (!testflag(addrlist, af_local_host_removed))
402 for (; addrlist; addrlist = addrlist->next)
403 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
404
405 return OK;
406 }
407
408
409
410 /*************************************************
411 * Initialization entry point *
412 *************************************************/
413
414 /* Called for each instance, after its options have been read, to
415 enable consistency checks to be done, or anything else that needs
416 to be set up.
417
418 Argument: pointer to the transport instance block
419 Returns: nothing
420 */
421
422 void
423 smtp_transport_init(transport_instance *tblock)
424 {
425 smtp_transport_options_block *ob = SOB tblock->options_block;
426
427 /* Retry_use_local_part defaults FALSE if unset */
428
429 if (tblock->retry_use_local_part == TRUE_UNSET)
430 tblock->retry_use_local_part = FALSE;
431
432 /* Set the default port according to the protocol */
433
434 if (!ob->port)
435 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
436 ? US"lmtp"
437 : strcmpic(ob->protocol, US"smtps") == 0
438 ? US"smtps" : US"smtp";
439
440 /* Set up the setup entry point, to be called before subprocesses for this
441 transport. */
442
443 tblock->setup = smtp_transport_setup;
444
445 /* Complain if any of the timeouts are zero. */
446
447 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
448 ob->final_timeout <= 0)
449 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
450 "command, data, or final timeout value is zero for %s transport",
451 tblock->name);
452
453 /* If hosts_override is set and there are local hosts, set the global
454 flag that stops verify from showing router hosts. */
455
456 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
457
458 /* If there are any fallback hosts listed, build a chain of host items
459 for them, but do not do any lookups at this time. */
460
461 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
462 }
463
464
465
466
467
468 /*************************************************
469 * Set delivery info into all active addresses *
470 *************************************************/
471
472 /* Only addresses whose status is >= PENDING are relevant. A lesser
473 status means that an address is not currently being processed.
474
475 Arguments:
476 addrlist points to a chain of addresses
477 errno_value to put in each address's errno field
478 msg to put in each address's message field
479 rc to put in each address's transport_return field
480 pass_message if TRUE, set the "pass message" flag in the address
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
484
485 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
486 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
487 this particular type of timeout.
488
489 Returns: nothing
490 */
491
492 static void
493 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
494 BOOL pass_message, host_item * host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar * smtp_greeting, const uschar * helo_response
497 #endif
498 )
499 {
500 int orvalue = 0;
501 if (errno_value == ERRNO_CONNECTTIMEOUT)
502 {
503 errno_value = ETIMEDOUT;
504 orvalue = RTEF_CTOUT;
505 }
506 for (address_item * addr = addrlist; addr; addr = addr->next)
507 if (addr->transport_return >= PENDING)
508 {
509 addr->basic_errno = errno_value;
510 addr->more_errno |= orvalue;
511 if (msg)
512 {
513 addr->message = msg;
514 if (pass_message) setflag(addr, af_pass_message);
515 }
516 addr->transport_return = rc;
517 if (host)
518 {
519 addr->host_used = host;
520 #ifdef EXPERIMENTAL_DSN_INFO
521 if (smtp_greeting)
522 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
523 addr->smtp_greeting = smtp_greeting;
524
525 if (helo_response)
526 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
527 addr->helo_response = helo_response;
528 #endif
529 }
530 }
531 }
532
533 static void
534 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
535 BOOL pass_message)
536 {
537 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
538 #ifdef EXPERIMENTAL_DSN_INFO
539 , NULL, NULL
540 #endif
541 );
542 }
543
544
545 /*************************************************
546 * Check an SMTP response *
547 *************************************************/
548
549 /* This function is given an errno code and the SMTP response buffer
550 to analyse, together with the host identification for generating messages. It
551 sets an appropriate message and puts the first digit of the response code into
552 the yield variable. If no response was actually read, a suitable digit is
553 chosen.
554
555 Arguments:
556 host the current host, to get its name for messages
557 errno_value pointer to the errno value
558 more_errno from the top address for use with ERRNO_FILTER_FAIL
559 buffer the SMTP response buffer
560 yield where to put a one-digit SMTP response code
561 message where to put an error message
562 pass_message set TRUE if message is an SMTP response
563
564 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
565 */
566
567 static BOOL
568 check_response(host_item *host, int *errno_value, int more_errno,
569 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
570 {
571 uschar * pl = pipelining_active ? US"pipelined " : US"";
572 const uschar * s;
573
574 *yield = '4'; /* Default setting is to give a temporary error */
575
576 switch(*errno_value)
577 {
578 case ETIMEDOUT: /* Handle response timeout */
579 *message = US string_sprintf("SMTP timeout after %s%s",
580 pl, smtp_command);
581 if (transport_count > 0)
582 *message = US string_sprintf("%s (%d bytes written)", *message,
583 transport_count);
584 return FALSE;
585
586 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
587 s = string_printing(buffer);
588 while (isspace(*s)) s++;
589 *message = *s == 0
590 ? string_sprintf("Malformed SMTP reply (an empty line) "
591 "in response to %s%s", pl, smtp_command)
592 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
593 pl, smtp_command, s);
594 return FALSE;
595
596 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
597 can't send QUIT as we mustn't end the DATA. */
598 *message = string_sprintf("transport filter process failed (%d)%s",
599 more_errno,
600 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
601 return FALSE;
602
603 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
604 can't send QUIT as we mustn't end the DATA. */
605 *message =
606 string_sprintf("failed to expand headers_add or headers_remove: %s",
607 expand_string_message);
608 return FALSE;
609
610 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
611 *message = string_sprintf("failed to write a data block");
612 return FALSE;
613
614 #ifdef SUPPORT_I18N
615 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
616 *message = US"utf8 support required but not offered for forwarding";
617 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
618 return TRUE;
619 #endif
620 }
621
622 /* Handle error responses from the remote mailer. */
623
624 if (buffer[0] != 0)
625 {
626 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
627 "%s", pl, smtp_command, s = string_printing(buffer));
628 *pass_message = TRUE;
629 *yield = buffer[0];
630 return TRUE;
631 }
632
633 /* No data was read. If there is no errno, this must be the EOF (i.e.
634 connection closed) case, which causes deferral. An explicit connection reset
635 error has the same effect. Otherwise, put the host's identity in the message,
636 leaving the errno value to be interpreted as well. In all cases, we have to
637 assume the connection is now dead. */
638
639 if (*errno_value == 0 || *errno_value == ECONNRESET)
640 {
641 *errno_value = ERRNO_SMTPCLOSED;
642 *message = US string_sprintf("Remote host closed connection "
643 "in response to %s%s", pl, smtp_command);
644 }
645 else
646 *message = US string_sprintf("%s [%s]", host->name, host->address);
647
648 return FALSE;
649 }
650
651
652
653 /*************************************************
654 * Write error message to logs *
655 *************************************************/
656
657 /* This writes to the main log and to the message log.
658
659 Arguments:
660 host the current host
661 detail the current message (addr_item->message)
662 basic_errno the errno (addr_item->basic_errno)
663
664 Returns: nothing
665 */
666
667 static void
668 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
669 {
670 gstring * message = LOGGING(outgoing_port)
671 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
672 host->port == PORT_NONE ? 25 : host->port)
673 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
674
675 if (suffix)
676 {
677 message = string_fmt_append(message, ": %s", suffix);
678 if (basic_errno > 0)
679 message = string_fmt_append(message, ": %s", strerror(basic_errno));
680 }
681 else
682 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
683
684 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
685 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
686 }
687
688 static void
689 msglog_line(host_item * host, uschar * message)
690 {
691 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
692 host->name, host->address, message);
693 }
694
695
696
697 #ifndef DISABLE_EVENT
698 /*************************************************
699 * Post-defer action *
700 *************************************************/
701
702 /* This expands an arbitrary per-transport string.
703 It might, for example, be used to write to the database log.
704
705 Arguments:
706 addr the address item containing error information
707 host the current host
708
709 Returns: nothing
710 */
711
712 static void
713 deferred_event_raise(address_item *addr, host_item *host)
714 {
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
717 uschar * save_local;
718
719 if (!action)
720 return;
721
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
724
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
729
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
734
735 (void) event_raise(action, US"msg:host:defer",
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
747 }
748 #endif
749
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
753 static int
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756 {
757 uschar flushbuffer[4096];
758
759 while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766 return count;
767 }
768
769
770 /* Return boolean success */
771
772 static BOOL
773 smtp_reap_banner(smtp_context * sx)
774 {
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
779 #endif
780 return good_response;
781 }
782
783 static BOOL
784 smtp_reap_ehlo(smtp_context * sx)
785 {
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793 #endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
800 #endif
801 return TRUE;
802 }
803
804
805
806 #ifdef EXPERIMENTAL_PIPE_CONNECT
807 static uschar *
808 ehlo_cache_key(const smtp_context * sx)
809 {
810 host_item * host = sx->conn_args.host;
811 return Ustrchr(host->address, ':')
812 ? string_sprintf("[%s]:%d.EHLO", host->address,
813 host->port == PORT_NONE ? sx->port : host->port)
814 : string_sprintf("%s:%d.EHLO", host->address,
815 host->port == PORT_NONE ? sx->port : host->port);
816 }
817
818 static void
819 write_ehlo_cache_entry(const smtp_context * sx)
820 {
821 open_db dbblock, * dbm_file;
822
823 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
824 {
825 uschar * ehlo_resp_key = ehlo_cache_key(sx);
826 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
827
828 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
829 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
830 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
831
832 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
833 dbfn_close(dbm_file);
834 }
835 }
836
837 static void
838 invalidate_ehlo_cache_entry(smtp_context * sx)
839 {
840 open_db dbblock, * dbm_file;
841
842 if ( sx->early_pipe_active
843 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
844 {
845 uschar * ehlo_resp_key = ehlo_cache_key(sx);
846 dbfn_delete(dbm_file, ehlo_resp_key);
847 dbfn_close(dbm_file);
848 }
849 }
850
851 static BOOL
852 read_ehlo_cache_entry(smtp_context * sx)
853 {
854 open_db dbblock;
855 open_db * dbm_file;
856
857 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
858 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
859 else
860 {
861 uschar * ehlo_resp_key = ehlo_cache_key(sx);
862 dbdata_ehlo_resp * er;
863
864 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
865 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
866 else if (time(NULL) - er->time_stamp > retry_data_expire)
867 {
868 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
869 dbfn_close(dbm_file);
870 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
871 dbfn_delete(dbm_file, ehlo_resp_key);
872 }
873 else
874 {
875 sx->ehlo_resp = er->data;
876 dbfn_close(dbm_file);
877 DEBUG(D_transport) debug_printf(
878 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
879 er->data.cleartext_features, er->data.crypted_features);
880 return TRUE;
881 }
882 dbfn_close(dbm_file);
883 }
884 return FALSE;
885 }
886
887
888
889 /* Return an auths bitmap for the set of AUTH methods offered by the server
890 which match our authenticators. */
891
892 static unsigned short
893 study_ehlo_auths(smtp_context * sx)
894 {
895 uschar * names;
896 auth_instance * au;
897 uschar authnum;
898 unsigned short authbits = 0;
899
900 if (!sx->esmtp) return 0;
901 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
902 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
903 expand_nmax = -1; /* reset */
904 names = string_copyn(expand_nstring[1], expand_nlength[1]);
905
906 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
907 {
908 const uschar * list = names;
909 int sep = ' ';
910 uschar name[32];
911
912 while (string_nextinlist(&list, &sep, name, sizeof(name)))
913 if (strcmpic(au->public_name, name) == 0)
914 { authbits |= BIT(authnum); break; }
915 }
916
917 DEBUG(D_transport)
918 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
919 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
920
921 if (tls_out.active.sock >= 0)
922 sx->ehlo_resp.crypted_auths = authbits;
923 else
924 sx->ehlo_resp.cleartext_auths = authbits;
925 return authbits;
926 }
927
928
929
930
931 /* Wait for and check responses for early-pipelining.
932
933 Called from the lower-level smtp_read_response() function
934 used for general code that assume synchronisation, if context
935 flags indicate outstanding early-pipelining commands. Also
936 called fom sync_responses() which handles pipelined commands.
937
938 Arguments:
939 sx smtp connection context
940 countp number of outstanding responses, adjusted on return
941
942 Return:
943 OK all well
944 FAIL SMTP error in response
945 */
946 int
947 smtp_reap_early_pipe(smtp_context * sx, int * countp)
948 {
949 BOOL pending_BANNER = sx->pending_BANNER;
950 BOOL pending_EHLO = sx->pending_EHLO;
951
952 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
953 sx->pending_EHLO = FALSE;
954
955 if (pending_BANNER)
956 {
957 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
958 (*countp)--;
959 if (!smtp_reap_banner(sx))
960 {
961 DEBUG(D_transport) debug_printf("bad banner\n");
962 goto fail;
963 }
964 }
965
966 if (pending_EHLO)
967 {
968 unsigned peer_offered;
969 unsigned short authbits = 0, * ap;
970
971 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
972 (*countp)--;
973 if (!smtp_reap_ehlo(sx))
974 {
975 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
976 goto fail;
977 }
978
979 /* Compare the actual EHLO response to the cached value we assumed;
980 on difference, dump or rewrite the cache and arrange for a retry. */
981
982 ap = tls_out.active.sock < 0
983 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
984
985 peer_offered = ehlo_response(sx->buffer,
986 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
987 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
988 | OPTION_UTF8 | OPTION_EARLY_PIPE
989 );
990 if ( peer_offered != sx->peer_offered
991 || (authbits = study_ehlo_auths(sx)) != *ap)
992 {
993 HDEBUG(D_transport)
994 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
995 tls_out.active.sock < 0 ? "cleartext" : "crypted",
996 sx->peer_offered, *ap, peer_offered, authbits);
997 *(tls_out.active.sock < 0
998 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
999 *ap = authbits;
1000 if (peer_offered & OPTION_EARLY_PIPE)
1001 write_ehlo_cache_entry(sx);
1002 else
1003 invalidate_ehlo_cache_entry(sx);
1004
1005 return OK; /* just carry on */
1006 }
1007 }
1008 return OK;
1009
1010 fail:
1011 invalidate_ehlo_cache_entry(sx);
1012 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1013 return FAIL;
1014 }
1015 #endif
1016
1017
1018 /*************************************************
1019 * Synchronize SMTP responses *
1020 *************************************************/
1021
1022 /* This function is called from smtp_deliver() to receive SMTP responses from
1023 the server, and match them up with the commands to which they relate. When
1024 PIPELINING is not in use, this function is called after every command, and is
1025 therefore somewhat over-engineered, but it is simpler to use a single scheme
1026 that works both with and without PIPELINING instead of having two separate sets
1027 of code.
1028
1029 The set of commands that are buffered up with pipelining may start with MAIL
1030 and may end with DATA; in between are RCPT commands that correspond to the
1031 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1032 etc.) are never buffered.
1033
1034 Errors after MAIL or DATA abort the whole process leaving the response in the
1035 buffer. After MAIL, pending responses are flushed, and the original command is
1036 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1037 permitted to reject some recipient addresses while accepting others. However
1038 certain errors clearly abort the whole process. Set the value in
1039 transport_return to PENDING_OK if the address is accepted. If there is a
1040 subsequent general error, it will get reset accordingly. If not, it will get
1041 converted to OK at the end.
1042
1043 Arguments:
1044 sx smtp connection context
1045 count the number of responses to read
1046 pending_DATA 0 if last command sent was not DATA
1047 +1 if previously had a good recipient
1048 -1 if not previously had a good recipient
1049
1050 Returns: 3 if at least one address had 2xx and one had 5xx
1051 2 if at least one address had 5xx but none had 2xx
1052 1 if at least one host had a 2xx response, but none had 5xx
1053 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1054 -1 timeout while reading RCPT response
1055 -2 I/O or other non-response error for RCPT
1056 -3 DATA or MAIL failed - errno and buffer set
1057 -4 banner or EHLO failed (early-pipelining)
1058 */
1059
1060 static int
1061 sync_responses(smtp_context * sx, int count, int pending_DATA)
1062 {
1063 address_item * addr = sx->sync_addr;
1064 smtp_transport_options_block * ob = sx->conn_args.ob;
1065 int yield = 0;
1066
1067 #ifdef EXPERIMENTAL_PIPE_CONNECT
1068 if (smtp_reap_early_pipe(sx, &count) != OK)
1069 return -4;
1070 #endif
1071
1072 /* Handle the response for a MAIL command. On error, reinstate the original
1073 command in big_buffer for error message use, and flush any further pending
1074 responses before returning, except after I/O errors and timeouts. */
1075
1076 if (sx->pending_MAIL)
1077 {
1078 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1079 count--;
1080 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1081 '2', ob->command_timeout))
1082 {
1083 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1084 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1085 if (errno == 0 && sx->buffer[0] != 0)
1086 {
1087 int save_errno = 0;
1088 if (sx->buffer[0] == '4')
1089 {
1090 save_errno = ERRNO_MAIL4XX;
1091 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1092 }
1093 count = smtp_discard_responses(sx, ob, count);
1094 errno = save_errno;
1095 }
1096
1097 if (pending_DATA) count--; /* Number of RCPT responses to come */
1098 while (count-- > 0) /* Mark any pending addrs with the host used */
1099 {
1100 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1101 addr->host_used = sx->conn_args.host;
1102 addr = addr->next;
1103 }
1104 return -3;
1105 }
1106 }
1107
1108 if (pending_DATA) count--; /* Number of RCPT responses to come */
1109
1110 /* Read and handle the required number of RCPT responses, matching each one up
1111 with an address by scanning for the next address whose status is PENDING_DEFER.
1112 */
1113
1114 while (count-- > 0)
1115 {
1116 while (addr->transport_return != PENDING_DEFER)
1117 if (!(addr = addr->next))
1118 return -2;
1119
1120 /* The address was accepted */
1121 addr->host_used = sx->conn_args.host;
1122
1123 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1124 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1125 '2', ob->command_timeout))
1126 {
1127 yield |= 1;
1128 addr->transport_return = PENDING_OK;
1129
1130 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1131 ensure that any address-specific retry record is expunged. We do this both
1132 for the basic key and for the version that also includes the sender. */
1133
1134 if (testflag(addr, af_dr_retry_exists))
1135 {
1136 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1137 sender_address);
1138 retry_add_item(addr, altkey, rf_delete);
1139 retry_add_item(addr, addr->address_retry_key, rf_delete);
1140 }
1141 }
1142
1143 /* Timeout while reading the response */
1144
1145 else if (errno == ETIMEDOUT)
1146 {
1147 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1148 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1149 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1150 retry_add_item(addr, addr->address_retry_key, 0);
1151 update_waiting = FALSE;
1152 return -1;
1153 }
1154
1155 /* Handle other errors in obtaining an SMTP response by returning -1. This
1156 will cause all the addresses to be deferred. Restore the SMTP command in
1157 big_buffer for which we are checking the response, so the error message
1158 makes sense. */
1159
1160 else if (errno != 0 || sx->buffer[0] == 0)
1161 {
1162 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1163 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1164 return -2;
1165 }
1166
1167 /* Handle SMTP permanent and temporary response codes. */
1168
1169 else
1170 {
1171 addr->message =
1172 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1173 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1174 string_printing(sx->buffer));
1175 setflag(addr, af_pass_message);
1176 if (!sx->verify)
1177 msglog_line(sx->conn_args.host, addr->message);
1178
1179 /* The response was 5xx */
1180
1181 if (sx->buffer[0] == '5')
1182 {
1183 addr->transport_return = FAIL;
1184 yield |= 2;
1185 }
1186
1187 /* The response was 4xx */
1188
1189 else
1190 {
1191 addr->transport_return = DEFER;
1192 addr->basic_errno = ERRNO_RCPT4XX;
1193 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1194
1195 if (!sx->verify)
1196 {
1197 #ifndef DISABLE_EVENT
1198 event_defer_errno = addr->more_errno;
1199 msg_event_raise(US"msg:rcpt:host:defer", addr);
1200 #endif
1201
1202 /* Log temporary errors if there are more hosts to be tried.
1203 If not, log this last one in the == line. */
1204
1205 if (sx->conn_args.host->next)
1206 if (LOGGING(outgoing_port))
1207 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1208 sx->conn_args.host->address,
1209 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1210 else
1211 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1212 sx->conn_args.host->address, addr->message);
1213
1214 #ifndef DISABLE_EVENT
1215 else
1216 msg_event_raise(US"msg:rcpt:defer", addr);
1217 #endif
1218
1219 /* Do not put this message on the list of those waiting for specific
1220 hosts, as otherwise it is likely to be tried too often. */
1221
1222 update_waiting = FALSE;
1223
1224 /* Add a retry item for the address so that it doesn't get tried again
1225 too soon. If address_retry_include_sender is true, add the sender address
1226 to the retry key. */
1227
1228 retry_add_item(addr,
1229 ob->address_retry_include_sender
1230 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1231 : addr->address_retry_key,
1232 0);
1233 }
1234 }
1235 }
1236 } /* Loop for next RCPT response */
1237
1238 /* Update where to start at for the next block of responses, unless we
1239 have already handled all the addresses. */
1240
1241 if (addr) sx->sync_addr = addr->next;
1242
1243 /* Handle a response to DATA. If we have not had any good recipients, either
1244 previously or in this block, the response is ignored. */
1245
1246 if (pending_DATA != 0)
1247 {
1248 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1249 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1250 '3', ob->command_timeout))
1251 {
1252 int code;
1253 uschar *msg;
1254 BOOL pass_message;
1255 if (pending_DATA > 0 || (yield & 1) != 0)
1256 {
1257 if (errno == 0 && sx->buffer[0] == '4')
1258 {
1259 errno = ERRNO_DATA4XX;
1260 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1261 }
1262 return -3;
1263 }
1264 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1265 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1266 "is in use and there were no good recipients\n", msg);
1267 }
1268 }
1269
1270 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1271 present) received 3xx. If any RCPTs were handled and yielded anything other
1272 than 4xx, yield will be set non-zero. */
1273
1274 return yield;
1275 }
1276
1277
1278
1279
1280
1281 /* Try an authenticator's client entry */
1282
1283 static int
1284 try_authenticator(smtp_context * sx, auth_instance * au)
1285 {
1286 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1287 host_item * host = sx->conn_args.host; /* host to deliver to */
1288 int rc;
1289
1290 sx->outblock.authenticating = TRUE;
1291 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1292 sx->buffer, sizeof(sx->buffer));
1293 sx->outblock.authenticating = FALSE;
1294 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1295
1296 /* A temporary authentication failure must hold up delivery to
1297 this host. After a permanent authentication failure, we carry on
1298 to try other authentication methods. If all fail hard, try to
1299 deliver the message unauthenticated unless require_auth was set. */
1300
1301 switch(rc)
1302 {
1303 case OK:
1304 f.smtp_authenticated = TRUE; /* stops the outer loop */
1305 client_authenticator = au->name;
1306 if (au->set_client_id)
1307 client_authenticated_id = expand_string(au->set_client_id);
1308 break;
1309
1310 /* Failure after writing a command */
1311
1312 case FAIL_SEND:
1313 return FAIL_SEND;
1314
1315 /* Failure after reading a response */
1316
1317 case FAIL:
1318 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1319 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1320 au->name, host->name, host->address, sx->buffer);
1321 break;
1322
1323 /* Failure by some other means. In effect, the authenticator
1324 decided it wasn't prepared to handle this case. Typically this
1325 is the result of "fail" in an expansion string. Do we need to
1326 log anything here? Feb 2006: a message is now put in the buffer
1327 if logging is required. */
1328
1329 case CANCELLED:
1330 if (*sx->buffer != 0)
1331 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1332 "authentication H=%s [%s] %s", au->name, host->name,
1333 host->address, sx->buffer);
1334 break;
1335
1336 /* Internal problem, message in buffer. */
1337
1338 case ERROR:
1339 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1340 DEFER, FALSE);
1341 return ERROR;
1342 }
1343 return OK;
1344 }
1345
1346
1347
1348
1349 /* Do the client side of smtp-level authentication.
1350
1351 Arguments:
1352 sx smtp connection context
1353
1354 sx->buffer should have the EHLO response from server (gets overwritten)
1355
1356 Returns:
1357 OK Success, or failed (but not required): global "smtp_authenticated" set
1358 DEFER Failed authentication (and was required)
1359 ERROR Internal problem
1360
1361 FAIL_SEND Failed communications - transmit
1362 FAIL - response
1363 */
1364
1365 static int
1366 smtp_auth(smtp_context * sx)
1367 {
1368 host_item * host = sx->conn_args.host; /* host to deliver to */
1369 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1370 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1371 #ifdef EXPERIMENTAL_PIPE_CONNECT
1372 unsigned short authbits = tls_out.active.sock >= 0
1373 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1374 #endif
1375 uschar * fail_reason = US"server did not advertise AUTH support";
1376
1377 f.smtp_authenticated = FALSE;
1378 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1379
1380 if (!regex_AUTH)
1381 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1382
1383 /* Is the server offering AUTH? */
1384
1385 if ( sx->esmtp
1386 &&
1387 #ifdef EXPERIMENTAL_PIPE_CONNECT
1388 sx->early_pipe_active ? authbits
1389 :
1390 #endif
1391 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1392 )
1393 {
1394 uschar * names = NULL;
1395 expand_nmax = -1; /* reset */
1396
1397 #ifdef EXPERIMENTAL_PIPE_CONNECT
1398 if (!sx->early_pipe_active)
1399 #endif
1400 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1401
1402 /* Must not do this check until after we have saved the result of the
1403 regex match above as the check could be another RE. */
1404
1405 if ( require_auth == OK
1406 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1407 {
1408 auth_instance * au;
1409
1410 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1411 fail_reason = US"no common mechanisms were found";
1412
1413 #ifdef EXPERIMENTAL_PIPE_CONNECT
1414 if (sx->early_pipe_active)
1415 {
1416 /* Scan our authenticators (which support use by a client and were offered
1417 by the server (checked at cache-write time)), not suppressed by
1418 client_condition. If one is found, attempt to authenticate by calling its
1419 client function. We are limited to supporting up to 16 authenticator
1420 public-names by the number of bits in a short. */
1421
1422 uschar bitnum;
1423 int rc;
1424
1425 for (bitnum = 0, au = auths;
1426 !f.smtp_authenticated && au && bitnum < 16;
1427 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1428 {
1429 if ( au->client_condition
1430 && !expand_check_condition(au->client_condition, au->name,
1431 US"client authenticator"))
1432 {
1433 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1434 au->name, "client_condition is false");
1435 continue;
1436 }
1437
1438 /* Found data for a listed mechanism. Call its client entry. Set
1439 a flag in the outblock so that data is overwritten after sending so
1440 that reflections don't show it. */
1441
1442 fail_reason = US"authentication attempt(s) failed";
1443
1444 if ((rc = try_authenticator(sx, au)) != OK)
1445 return rc;
1446 }
1447 }
1448 else
1449 #endif
1450
1451 /* Scan the configured authenticators looking for one which is configured
1452 for use as a client, which is not suppressed by client_condition, and
1453 whose name matches an authentication mechanism supported by the server.
1454 If one is found, attempt to authenticate by calling its client function.
1455 */
1456
1457 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1458 {
1459 uschar *p = names;
1460
1461 if ( !au->client
1462 || ( au->client_condition
1463 && !expand_check_condition(au->client_condition, au->name,
1464 US"client authenticator")))
1465 {
1466 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1467 au->name,
1468 (au->client)? "client_condition is false" :
1469 "not configured as a client");
1470 continue;
1471 }
1472
1473 /* Loop to scan supported server mechanisms */
1474
1475 while (*p)
1476 {
1477 int len = Ustrlen(au->public_name);
1478 int rc;
1479
1480 while (isspace(*p)) p++;
1481
1482 if (strncmpic(au->public_name, p, len) != 0 ||
1483 (p[len] != 0 && !isspace(p[len])))
1484 {
1485 while (*p != 0 && !isspace(*p)) p++;
1486 continue;
1487 }
1488
1489 /* Found data for a listed mechanism. Call its client entry. Set
1490 a flag in the outblock so that data is overwritten after sending so
1491 that reflections don't show it. */
1492
1493 fail_reason = US"authentication attempt(s) failed";
1494
1495 if ((rc = try_authenticator(sx, au)) != OK)
1496 return rc;
1497
1498 break; /* If not authenticated, try next authenticator */
1499 } /* Loop for scanning supported server mechanisms */
1500 } /* Loop for further authenticators */
1501 }
1502 }
1503
1504 /* If we haven't authenticated, but are required to, give up. */
1505
1506 if (require_auth == OK && !f.smtp_authenticated)
1507 {
1508 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1509 string_sprintf("authentication required but %s", fail_reason), DEFER,
1510 FALSE);
1511 return DEFER;
1512 }
1513
1514 return OK;
1515 }
1516
1517
1518 /* Construct AUTH appendix string for MAIL TO */
1519 /*
1520 Arguments
1521 buffer to build string
1522 addrlist chain of potential addresses to deliver
1523 ob transport options
1524
1525 Globals f.smtp_authenticated
1526 client_authenticated_sender
1527 Return True on error, otherwise buffer has (possibly empty) terminated string
1528 */
1529
1530 BOOL
1531 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1532 smtp_transport_options_block *ob)
1533 {
1534 uschar *local_authenticated_sender = authenticated_sender;
1535
1536 #ifdef notdef
1537 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1538 #endif
1539
1540 if (ob->authenticated_sender != NULL)
1541 {
1542 uschar *new = expand_string(ob->authenticated_sender);
1543 if (new == NULL)
1544 {
1545 if (!f.expand_string_forcedfail)
1546 {
1547 uschar *message = string_sprintf("failed to expand "
1548 "authenticated_sender: %s", expand_string_message);
1549 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1550 return TRUE;
1551 }
1552 }
1553 else if (new[0] != 0) local_authenticated_sender = new;
1554 }
1555
1556 /* Add the authenticated sender address if present */
1557
1558 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1559 local_authenticated_sender != NULL)
1560 {
1561 string_format(buffer, bufsize, " AUTH=%s",
1562 auth_xtextencode(local_authenticated_sender,
1563 Ustrlen(local_authenticated_sender)));
1564 client_authenticated_sender = string_copy(local_authenticated_sender);
1565 }
1566 else
1567 *buffer= 0;
1568
1569 return FALSE;
1570 }
1571
1572
1573
1574 #ifdef SUPPORT_DANE
1575 /* Lookup TLSA record for host/port.
1576 Return: OK success with dnssec; DANE mode
1577 DEFER Do not use this host now, may retry later
1578 FAIL_FORCED No TLSA record; DANE not usable
1579 FAIL Do not use this connection
1580 */
1581
1582 int
1583 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1584 {
1585 /* move this out to host.c given the similarity to dns_lookup() ? */
1586 uschar buffer[300];
1587 const uschar * fullname = buffer;
1588 int rc;
1589 BOOL sec;
1590
1591 /* TLSA lookup string */
1592 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1593
1594 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1595 sec = dns_is_secure(dnsa);
1596 DEBUG(D_transport)
1597 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1598
1599 switch (rc)
1600 {
1601 case DNS_AGAIN:
1602 return DEFER; /* just defer this TLS'd conn */
1603
1604 case DNS_SUCCEED:
1605 if (sec)
1606 {
1607 DEBUG(D_transport)
1608 {
1609 dns_scan dnss;
1610 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1611 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1612 if (rr->type == T_TLSA && rr->size > 3)
1613 {
1614 uint16_t payload_length = rr->size - 3;
1615 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1616
1617 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1618 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1619 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1620 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1621 sp += sprintf(CS sp, "%02x", *p++);
1622
1623 debug_printf(" %s\n", s);
1624 }
1625 }
1626 return OK;
1627 }
1628 log_write(0, LOG_MAIN,
1629 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1630 /*FALLTRHOUGH*/
1631
1632 case DNS_NODATA: /* no TLSA RR for this lookup */
1633 case DNS_NOMATCH: /* no records at all for this lookup */
1634 return dane_required ? FAIL : FAIL_FORCED;
1635
1636 default:
1637 case DNS_FAIL:
1638 return dane_required ? FAIL : DEFER;
1639 }
1640 }
1641 #endif
1642
1643
1644
1645 typedef struct smtp_compare_s
1646 {
1647 uschar *current_sender_address;
1648 struct transport_instance *tblock;
1649 } smtp_compare_t;
1650
1651
1652 /* Create a unique string that identifies this message, it is based on
1653 sender_address, helo_data and tls_certificate if enabled.
1654 */
1655
1656 static uschar *
1657 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1658 {
1659 address_item * addr1;
1660 uschar * if1 = US"";
1661 uschar * helo1 = US"";
1662 #ifdef SUPPORT_TLS
1663 uschar * tlsc1 = US"";
1664 #endif
1665 uschar * save_sender_address = sender_address;
1666 uschar * local_identity = NULL;
1667 smtp_transport_options_block * ob = SOB tblock->options_block;
1668
1669 sender_address = sender;
1670
1671 addr1 = deliver_make_addr (sender, TRUE);
1672 deliver_set_expansions(addr1);
1673
1674 if (ob->interface)
1675 if1 = expand_string(ob->interface);
1676
1677 if (ob->helo_data)
1678 helo1 = expand_string(ob->helo_data);
1679
1680 #ifdef SUPPORT_TLS
1681 if (ob->tls_certificate)
1682 tlsc1 = expand_string(ob->tls_certificate);
1683 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1684 #else
1685 local_identity = string_sprintf ("%s^%s", if1, helo1);
1686 #endif
1687
1688 deliver_set_expansions(NULL);
1689 sender_address = save_sender_address;
1690
1691 return local_identity;
1692 }
1693
1694
1695
1696 /* This routine is a callback that is called from transport_check_waiting.
1697 This function will evaluate the incoming message versus the previous
1698 message. If the incoming message is using a different local identity then
1699 we will veto this new message. */
1700
1701 static BOOL
1702 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1703 {
1704 uschar * message_local_identity,
1705 * current_local_identity,
1706 * new_sender_address;
1707
1708 current_local_identity =
1709 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1710
1711 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1712 return 0;
1713
1714 message_local_identity =
1715 smtp_local_identity(new_sender_address, s_compare->tblock);
1716
1717 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1718 }
1719
1720
1721
1722 static unsigned
1723 ehlo_response(uschar * buf, unsigned checks)
1724 {
1725 size_t bsize = Ustrlen(buf);
1726
1727 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1728
1729 #ifdef SUPPORT_TLS
1730 # ifdef EXPERIMENTAL_REQUIRETLS
1731 if ( checks & OPTION_REQUIRETLS
1732 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1733 # endif
1734 checks &= ~OPTION_REQUIRETLS;
1735
1736 if ( checks & OPTION_TLS
1737 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1738 #endif
1739 checks &= ~OPTION_TLS;
1740
1741 if ( checks & OPTION_IGNQ
1742 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1743 PCRE_EOPT, NULL, 0) < 0)
1744 checks &= ~OPTION_IGNQ;
1745
1746 if ( checks & OPTION_CHUNKING
1747 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1748 checks &= ~OPTION_CHUNKING;
1749
1750 #ifndef DISABLE_PRDR
1751 if ( checks & OPTION_PRDR
1752 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1753 #endif
1754 checks &= ~OPTION_PRDR;
1755
1756 #ifdef SUPPORT_I18N
1757 if ( checks & OPTION_UTF8
1758 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1759 #endif
1760 checks &= ~OPTION_UTF8;
1761
1762 if ( checks & OPTION_DSN
1763 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1764 checks &= ~OPTION_DSN;
1765
1766 if ( checks & OPTION_PIPE
1767 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1768 PCRE_EOPT, NULL, 0) < 0)
1769 checks &= ~OPTION_PIPE;
1770
1771 if ( checks & OPTION_SIZE
1772 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1773 checks &= ~OPTION_SIZE;
1774
1775 #ifdef EXPERIMENTAL_PIPE_CONNECT
1776 if ( checks & OPTION_EARLY_PIPE
1777 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1778 PCRE_EOPT, NULL, 0) < 0)
1779 #endif
1780 checks &= ~OPTION_EARLY_PIPE;
1781
1782 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1783 return checks;
1784 }
1785
1786
1787
1788 /* Callback for emitting a BDAT data chunk header.
1789
1790 If given a nonzero size, first flush any buffered SMTP commands
1791 then emit the command.
1792
1793 Reap previous SMTP command responses if requested, and always reap
1794 the response from a previous BDAT command.
1795
1796 Args:
1797 tctx transport context
1798 chunk_size value for SMTP BDAT command
1799 flags
1800 tc_chunk_last add LAST option to SMTP BDAT command
1801 tc_reap_prev reap response to previous SMTP commands
1802
1803 Returns: OK or ERROR
1804 */
1805
1806 static int
1807 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1808 unsigned flags)
1809 {
1810 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1811 smtp_context * sx = tctx->smtp_context;
1812 int cmd_count = 0;
1813 int prev_cmd_count;
1814
1815 /* Write SMTP chunk header command. If not reaping responses, note that
1816 there may be more writes (like, the chunk data) done soon. */
1817
1818 if (chunk_size > 0)
1819 {
1820 #ifdef EXPERIMENTAL_PIPE_CONNECT
1821 BOOL new_conn = !!(sx->outblock.conn_args);
1822 #endif
1823 if((cmd_count = smtp_write_command(sx,
1824 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1825 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1826 ) < 0) return ERROR;
1827 if (flags & tc_chunk_last)
1828 data_command = string_copy(big_buffer); /* Save for later error message */
1829 #ifdef EXPERIMENTAL_PIPE_CONNECT
1830 /* That command write could have been the one that made the connection.
1831 Copy the fd from the client conn ctx (smtp transport specific) to the
1832 generic transport ctx. */
1833
1834 if (new_conn)
1835 tctx->u.fd = sx->outblock.cctx->sock;
1836 #endif
1837 }
1838
1839 prev_cmd_count = cmd_count += sx->cmd_count;
1840
1841 /* Reap responses for any previous, but not one we just emitted */
1842
1843 if (chunk_size > 0)
1844 prev_cmd_count--;
1845 if (sx->pending_BDAT)
1846 prev_cmd_count--;
1847
1848 if (flags & tc_reap_prev && prev_cmd_count > 0)
1849 {
1850 DEBUG(D_transport) debug_printf("look for %d responses"
1851 " for previous pipelined cmds\n", prev_cmd_count);
1852
1853 switch(sync_responses(sx, prev_cmd_count, 0))
1854 {
1855 case 1: /* 2xx (only) => OK */
1856 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1857 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1858 case 0: break; /* No 2xx or 5xx, but no probs */
1859
1860 case -1: /* Timeout on RCPT */
1861 #ifdef EXPERIMENTAL_PIPE_CONNECT
1862 case -4: /* non-2xx for pipelined banner or EHLO */
1863 #endif
1864 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1865 }
1866 cmd_count = 1;
1867 if (!sx->pending_BDAT)
1868 pipelining_active = FALSE;
1869 }
1870
1871 /* Reap response for an outstanding BDAT */
1872
1873 if (sx->pending_BDAT)
1874 {
1875 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1876
1877 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1878 ob->command_timeout))
1879 {
1880 if (errno == 0 && sx->buffer[0] == '4')
1881 {
1882 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1883 sx->addrlist->more_errno |=
1884 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1885 }
1886 return ERROR;
1887 }
1888 cmd_count--;
1889 sx->pending_BDAT = FALSE;
1890 pipelining_active = FALSE;
1891 }
1892 else if (chunk_size > 0)
1893 sx->pending_BDAT = TRUE;
1894
1895
1896 sx->cmd_count = cmd_count;
1897 return OK;
1898 }
1899
1900
1901
1902
1903
1904 /*************************************************
1905 * Make connection for given message *
1906 *************************************************/
1907
1908 /*
1909 Arguments:
1910 ctx connection context
1911 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1912 a second attempt after TLS initialization fails
1913
1914 Returns: OK - the connection was made and the delivery attempted;
1915 fd is set in the conn context, tls_out set up.
1916 DEFER - the connection could not be made, or something failed
1917 while setting up the SMTP session, or there was a
1918 non-message-specific error, such as a timeout.
1919 ERROR - helo_data or add_headers or authenticated_sender is
1920 specified for this transport, and the string failed
1921 to expand
1922 */
1923 int
1924 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1925 {
1926 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1927 dns_answer tlsa_dnsa;
1928 #endif
1929 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1930 BOOL pass_message = FALSE;
1931 uschar * message = NULL;
1932 int yield = OK;
1933 int rc;
1934
1935 sx->conn_args.ob = ob;
1936
1937 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1938 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1939 sx->ok = FALSE;
1940 sx->send_rset = TRUE;
1941 sx->send_quit = TRUE;
1942 sx->setting_up = TRUE;
1943 sx->esmtp = TRUE;
1944 sx->esmtp_sent = FALSE;
1945 #ifdef SUPPORT_I18N
1946 sx->utf8_needed = FALSE;
1947 #endif
1948 sx->dsn_all_lasthop = TRUE;
1949 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1950 sx->dane = FALSE;
1951 sx->dane_required =
1952 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1953 #endif
1954 #ifdef EXPERIMENTAL_PIPE_CONNECT
1955 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1956 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1957 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1958 #endif
1959
1960 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1961 sx->peer_offered = 0;
1962 sx->avoid_option = 0;
1963 sx->igquotstr = US"";
1964 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1965 #ifdef EXPERIMENTAL_DSN_INFO
1966 sx->smtp_greeting = NULL;
1967 sx->helo_response = NULL;
1968 #endif
1969
1970 smtp_command = US"initial connection";
1971 sx->buffer[0] = '\0';
1972
1973 /* Set up the buffer for reading SMTP response packets. */
1974
1975 sx->inblock.buffer = sx->inbuffer;
1976 sx->inblock.buffersize = sizeof(sx->inbuffer);
1977 sx->inblock.ptr = sx->inbuffer;
1978 sx->inblock.ptrend = sx->inbuffer;
1979
1980 /* Set up the buffer for holding SMTP commands while pipelining */
1981
1982 sx->outblock.buffer = sx->outbuffer;
1983 sx->outblock.buffersize = sizeof(sx->outbuffer);
1984 sx->outblock.ptr = sx->outbuffer;
1985 sx->outblock.cmd_count = 0;
1986 sx->outblock.authenticating = FALSE;
1987 sx->outblock.conn_args = NULL;
1988
1989 /* Reset the parameters of a TLS session. */
1990
1991 tls_out.bits = 0;
1992 tls_out.cipher = NULL; /* the one we may use for this transport */
1993 tls_out.ourcert = NULL;
1994 tls_out.peercert = NULL;
1995 tls_out.peerdn = NULL;
1996 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1997 tls_out.sni = NULL;
1998 #endif
1999 tls_out.ocsp = OCSP_NOT_REQ;
2000
2001 /* Flip the legacy TLS-related variables over to the outbound set in case
2002 they're used in the context of the transport. Don't bother resetting
2003 afterward (when being used by a transport) as we're in a subprocess.
2004 For verify, unflipped once the callout is dealt with */
2005
2006 tls_modify_variables(&tls_out);
2007
2008 #ifndef SUPPORT_TLS
2009 if (sx->smtps)
2010 {
2011 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2012 DEFER, FALSE);
2013 return ERROR;
2014 }
2015 #endif
2016
2017 /* Make a connection to the host if this isn't a continued delivery, and handle
2018 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2019 specially so they can be identified for retries. */
2020
2021 if (!continue_hostname)
2022 {
2023 if (sx->verify)
2024 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2025
2026 /* Get the actual port the connection will use, into sx->conn_args.host */
2027
2028 smtp_port_for_connect(sx->conn_args.host, sx->port);
2029
2030 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2031 /* Do TLSA lookup for DANE */
2032 {
2033 tls_out.dane_verified = FALSE;
2034 tls_out.tlsa_usage = 0;
2035
2036 if (sx->conn_args.host->dnssec == DS_YES)
2037 {
2038 if( sx->dane_required
2039 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2040 )
2041 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2042 {
2043 case OK: sx->dane = TRUE;
2044 ob->tls_tempfail_tryclear = FALSE;
2045 break;
2046 case FAIL_FORCED: break;
2047 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2048 string_sprintf("DANE error: tlsa lookup %s",
2049 rc == DEFER ? "DEFER" : "FAIL"),
2050 rc, FALSE);
2051 # ifndef DISABLE_EVENT
2052 (void) event_raise(sx->conn_args.tblock->event_action,
2053 US"dane:fail", sx->dane_required
2054 ? US"dane-required" : US"dnssec-invalid");
2055 # endif
2056 return rc;
2057 }
2058 }
2059 else if (sx->dane_required)
2060 {
2061 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2062 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2063 FAIL, FALSE);
2064 # ifndef DISABLE_EVENT
2065 (void) event_raise(sx->conn_args.tblock->event_action,
2066 US"dane:fail", US"dane-required");
2067 # endif
2068 return FAIL;
2069 }
2070 }
2071 #endif /*DANE*/
2072
2073 /* Make the TCP connection */
2074
2075 sx->cctx.tls_ctx = NULL;
2076 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2077 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2078
2079 #ifdef EXPERIMENTAL_PIPE_CONNECT
2080 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2081 {
2082 sx->early_pipe_ok = TRUE;
2083 if ( read_ehlo_cache_entry(sx)
2084 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2085 {
2086 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2087 sx->early_pipe_active = TRUE;
2088 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2089 }
2090 }
2091
2092 if (sx->early_pipe_active)
2093 sx->outblock.conn_args = &sx->conn_args;
2094 else
2095 #endif
2096 {
2097 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2098 {
2099 uschar * msg = NULL;
2100 if (sx->verify)
2101 {
2102 msg = US strerror(errno);
2103 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2104 }
2105 set_errno_nohost(sx->addrlist,
2106 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2107 sx->verify ? string_sprintf("could not connect: %s", msg)
2108 : NULL,
2109 DEFER, FALSE);
2110 sx->send_quit = FALSE;
2111 return DEFER;
2112 }
2113 }
2114 /* Expand the greeting message while waiting for the initial response. (Makes
2115 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2116 delayed till here so that $sending_interface and $sending_port are set. */
2117 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2118 will be? Somehow I doubt it. */
2119
2120 if (sx->helo_data)
2121 if (!(sx->helo_data = expand_string(sx->helo_data)))
2122 if (sx->verify)
2123 log_write(0, LOG_MAIN|LOG_PANIC,
2124 "<%s>: failed to expand transport's helo_data value for callout: %s",
2125 sx->addrlist->address, expand_string_message);
2126
2127 #ifdef SUPPORT_I18N
2128 if (sx->helo_data)
2129 {
2130 expand_string_message = NULL;
2131 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2132 &expand_string_message)),
2133 expand_string_message)
2134 if (sx->verify)
2135 log_write(0, LOG_MAIN|LOG_PANIC,
2136 "<%s>: failed to expand transport's helo_data value for callout: %s",
2137 sx->addrlist->address, expand_string_message);
2138 else
2139 sx->helo_data = NULL;
2140 }
2141 #endif
2142
2143 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2144 is nevertheless a reasonably clean way of programming this kind of logic,
2145 where you want to escape on any error. */
2146
2147 if (!sx->smtps)
2148 {
2149 #ifdef EXPERIMENTAL_PIPE_CONNECT
2150 if (sx->early_pipe_active)
2151 {
2152 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2153 sx->outblock.cmd_count = 1;
2154 }
2155 else
2156 #endif
2157 {
2158 #ifdef TCP_QUICKACK
2159 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2160 sizeof(off));
2161 #endif
2162 if (!smtp_reap_banner(sx))
2163 goto RESPONSE_FAILED;
2164 }
2165
2166 #ifndef DISABLE_EVENT
2167 {
2168 uschar * s;
2169 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2170 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2171 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2172 if (s)
2173 {
2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2175 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2176 DEFER, FALSE);
2177 yield = DEFER;
2178 goto SEND_QUIT;
2179 }
2180 }
2181 #endif
2182
2183 /* Now check if the helo_data expansion went well, and sign off cleanly if
2184 it didn't. */
2185
2186 if (!sx->helo_data)
2187 {
2188 message = string_sprintf("failed to expand helo_data: %s",
2189 expand_string_message);
2190 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2191 yield = DEFER;
2192 goto SEND_QUIT;
2193 }
2194 }
2195
2196 /** Debugging without sending a message
2197 sx->addrlist->transport_return = DEFER;
2198 goto SEND_QUIT;
2199 **/
2200
2201 /* Errors that occur after this point follow an SMTP command, which is
2202 left in big_buffer by smtp_write_command() for use in error messages. */
2203
2204 smtp_command = big_buffer;
2205
2206 /* Tell the remote who we are...
2207
2208 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2209 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2210 greeting is of this form. The assumption was that the far end supports it
2211 properly... but experience shows that there are some that give 5xx responses,
2212 even though the banner includes "ESMTP" (there's a bloody-minded one that
2213 says "ESMTP not spoken here"). Cope with that case.
2214
2215 September 2000: Time has passed, and it seems reasonable now to always send
2216 EHLO at the start. It is also convenient to make the change while installing
2217 the TLS stuff.
2218
2219 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2220 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2221 would be no way to send out the mails, so there is now a host list
2222 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2223 PIPELINING problem as well. Maybe it can also be useful to cure other
2224 problems with broken servers.
2225
2226 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2227 Then somebody tried it with a Microsoft mailer... It seems that all other
2228 mailers use upper case for some reason (the RFC is quite clear about case
2229 independence) so, for peace of mind, I gave in. */
2230
2231 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2232
2233 /* Alas; be careful, since this goto is not an error-out, so conceivably
2234 we might set data between here and the target which we assume to exist
2235 and be usable. I can see this coming back to bite us. */
2236 #ifdef SUPPORT_TLS
2237 if (sx->smtps)
2238 {
2239 smtp_peer_options |= OPTION_TLS;
2240 suppress_tls = FALSE;
2241 ob->tls_tempfail_tryclear = FALSE;
2242 smtp_command = US"SSL-on-connect";
2243 goto TLS_NEGOTIATE;
2244 }
2245 #endif
2246
2247 if (sx->esmtp)
2248 {
2249 if (smtp_write_command(sx,
2250 #ifdef EXPERIMENTAL_PIPE_CONNECT
2251 sx->early_pipe_active ? SCMD_BUFFER :
2252 #endif
2253 SCMD_FLUSH,
2254 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2255 goto SEND_FAILED;
2256 sx->esmtp_sent = TRUE;
2257
2258 #ifdef EXPERIMENTAL_PIPE_CONNECT
2259 if (sx->early_pipe_active)
2260 {
2261 sx->pending_EHLO = TRUE;
2262
2263 /* If we have too many authenticators to handle and might need to AUTH
2264 for this transport, pipeline no further as we will need the
2265 list of auth methods offered. Reap the banner and EHLO. */
2266
2267 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2268 && f.smtp_in_early_pipe_no_auth)
2269 {
2270 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2271 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2272 goto SEND_FAILED;
2273 if (sync_responses(sx, 2, 0) != 0)
2274 {
2275 HDEBUG(D_transport)
2276 debug_printf("failed reaping pipelined cmd responses\n");
2277 goto RESPONSE_FAILED;
2278 }
2279 sx->early_pipe_active = FALSE;
2280 }
2281 }
2282 else
2283 #endif
2284 if (!smtp_reap_ehlo(sx))
2285 goto RESPONSE_FAILED;
2286 }
2287 else
2288 DEBUG(D_transport)
2289 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2290
2291 #ifdef EXPERIMENTAL_PIPE_CONNECT
2292 if (!sx->early_pipe_active)
2293 #endif
2294 if (!sx->esmtp)
2295 {
2296 BOOL good_response;
2297 int n = sizeof(sx->buffer);
2298 uschar * rsp = sx->buffer;
2299
2300 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2301 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2302
2303 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2304 goto SEND_FAILED;
2305 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2306 #ifdef EXPERIMENTAL_DSN_INFO
2307 sx->helo_response = string_copy(rsp);
2308 #endif
2309 if (!good_response)
2310 {
2311 /* Handle special logging for a closed connection after HELO
2312 when had previously sent EHLO */
2313
2314 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2315 {
2316 errno = ERRNO_SMTPCLOSED;
2317 goto EHLOHELO_FAILED;
2318 }
2319 memmove(sx->buffer, rsp, Ustrlen(rsp));
2320 goto RESPONSE_FAILED;
2321 }
2322 }
2323
2324 if (sx->esmtp || sx->lmtp)
2325 {
2326 #ifdef EXPERIMENTAL_PIPE_CONNECT
2327 if (!sx->early_pipe_active)
2328 #endif
2329 {
2330 sx->peer_offered = ehlo_response(sx->buffer,
2331 OPTION_TLS /* others checked later */
2332 #ifdef EXPERIMENTAL_PIPE_CONNECT
2333 | (sx->early_pipe_ok
2334 ? OPTION_IGNQ
2335 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2336 #ifdef SUPPORT_I18N
2337 | OPTION_UTF8
2338 #endif
2339 | OPTION_EARLY_PIPE
2340 : 0
2341 )
2342 #endif
2343 );
2344 #ifdef EXPERIMENTAL_PIPE_CONNECT
2345 if (sx->early_pipe_ok)
2346 {
2347 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2348
2349 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2350 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2351 {
2352 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2353 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2354 write_ehlo_cache_entry(sx);
2355 }
2356 }
2357 #endif
2358 }
2359
2360 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2361
2362 #ifdef SUPPORT_TLS
2363 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2364 #endif
2365 }
2366 }
2367
2368 /* For continuing deliveries down the same channel, having re-exec'd the socket
2369 is the standard input; for a socket held open from verify it is recorded
2370 in the cutthrough context block. Either way we don't need to redo EHLO here
2371 (but may need to do so for TLS - see below).
2372 Set up the pointer to where subsequent commands will be left, for
2373 error messages. Note that smtp_peer_options will have been
2374 set from the command line if they were set in the process that passed the
2375 connection on. */
2376
2377 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2378 as the continue goes via transport_pass_socket() and doublefork and exec.
2379 It does not wait. Unclear how we keep separate host's responses
2380 separate - we could match up by host ip+port as a bodge. */
2381
2382 else
2383 {
2384 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2385 {
2386 sx->cctx = cutthrough.cctx;
2387 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2388 }
2389 else
2390 {
2391 sx->cctx.sock = 0; /* stdin */
2392 sx->cctx.tls_ctx = NULL;
2393 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2394 }
2395 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2396 smtp_command = big_buffer;
2397 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2398
2399 /* For a continued connection with TLS being proxied for us, or a
2400 held-open verify connection with TLS, nothing more to do. */
2401
2402 if ( continue_proxy_cipher
2403 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2404 && cutthrough.is_tls)
2405 )
2406 {
2407 sx->peer_offered = smtp_peer_options;
2408 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2409 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2410 continue_proxy_cipher ? "proxied" : "verify conn with");
2411 return OK;
2412 }
2413 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2414 }
2415
2416 /* If TLS is available on this connection, whether continued or not, attempt to
2417 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2418 send another EHLO - the server may give a different answer in secure mode. We
2419 use a separate buffer for reading the response to STARTTLS so that if it is
2420 negative, the original EHLO data is available for subsequent analysis, should
2421 the client not be required to use TLS. If the response is bad, copy the buffer
2422 for error analysis. */
2423
2424 #ifdef SUPPORT_TLS
2425 if ( smtp_peer_options & OPTION_TLS
2426 && !suppress_tls
2427 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2428 && ( !sx->verify
2429 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2430 ) )
2431 {
2432 uschar buffer2[4096];
2433
2434 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2435 goto SEND_FAILED;
2436
2437 #ifdef EXPERIMENTAL_PIPE_CONNECT
2438 /* If doing early-pipelining reap the banner and EHLO-response but leave
2439 the response for the STARTTLS we just sent alone. */
2440
2441 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2442 {
2443 HDEBUG(D_transport)
2444 debug_printf("failed reaping pipelined cmd responses\n");
2445 goto RESPONSE_FAILED;
2446 }
2447 #endif
2448
2449 /* If there is an I/O error, transmission of this message is deferred. If
2450 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2451 false, we also defer. However, if there is a temporary rejection of STARTTLS
2452 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2453 STARTTLS, we carry on. This means we will try to send the message in clear,
2454 unless the host is in hosts_require_tls (tested below). */
2455
2456 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2457 {
2458 if ( errno != 0
2459 || buffer2[0] == 0
2460 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2461 )
2462 {
2463 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2464 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2465 goto RESPONSE_FAILED;
2466 }
2467 }
2468
2469 /* STARTTLS accepted: try to negotiate a TLS session. */
2470
2471 else
2472 TLS_NEGOTIATE:
2473 {
2474 address_item * addr;
2475 uschar * errstr;
2476 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2477 sx->addrlist, sx->conn_args.tblock,
2478 # ifdef SUPPORT_DANE
2479 sx->dane ? &tlsa_dnsa : NULL,
2480 # endif
2481 &tls_out, &errstr);
2482
2483 if (!sx->cctx.tls_ctx)
2484 {
2485 /* TLS negotiation failed; give an error. From outside, this function may
2486 be called again to try in clear on a new connection, if the options permit
2487 it for this host. */
2488 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2489
2490 # ifdef SUPPORT_DANE
2491 if (sx->dane)
2492 {
2493 log_write(0, LOG_MAIN,
2494 "DANE attempt failed; TLS connection to %s [%s]: %s",
2495 sx->conn_args.host->name, sx->conn_args.host->address, errstr);
2496 # ifndef DISABLE_EVENT
2497 (void) event_raise(sx->conn_args.tblock->event_action,
2498 US"dane:fail", US"validation-failure"); /* could do with better detail */
2499 # endif
2500 }
2501 # endif
2502
2503 errno = ERRNO_TLSFAILURE;
2504 message = string_sprintf("TLS session: %s", errstr);
2505 sx->send_quit = FALSE;
2506 goto TLS_FAILED;
2507 }
2508
2509 /* TLS session is set up */
2510
2511 smtp_peer_options_wrap = smtp_peer_options;
2512 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2513 if (addr->transport_return == PENDING_DEFER)
2514 {
2515 addr->cipher = tls_out.cipher;
2516 addr->ourcert = tls_out.ourcert;
2517 addr->peercert = tls_out.peercert;
2518 addr->peerdn = tls_out.peerdn;
2519 addr->ocsp = tls_out.ocsp;
2520 }
2521 }
2522 }
2523
2524 /* if smtps, we'll have smtp_command set to something else; always safe to
2525 reset it here. */
2526 smtp_command = big_buffer;
2527
2528 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2529 helo_data is null, we are dealing with a connection that was passed from
2530 another process, and so we won't have expanded helo_data above. We have to
2531 expand it here. $sending_ip_address and $sending_port are set up right at the
2532 start of the Exim process (in exim.c). */
2533
2534 if (tls_out.active.sock >= 0)
2535 {
2536 uschar * greeting_cmd;
2537
2538 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2539 {
2540 uschar *message = string_sprintf("failed to expand helo_data: %s",
2541 expand_string_message);
2542 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2543 yield = DEFER;
2544 goto SEND_QUIT;
2545 }
2546
2547 #ifdef EXPERIMENTAL_PIPE_CONNECT
2548 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2549 We're unlikely to get the group sent and delivered before the server sends its
2550 banner, but it's still worth sending as a group.
2551 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2552 the reverse. */
2553
2554 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2555 {
2556 sx->peer_offered = sx->ehlo_resp.crypted_features;
2557 if ((sx->early_pipe_active =
2558 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2559 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2560 }
2561 #endif
2562
2563 /* For SMTPS we need to wait for the initial OK response. */
2564 if (sx->smtps)
2565 #ifdef EXPERIMENTAL_PIPE_CONNECT
2566 if (sx->early_pipe_active)
2567 {
2568 sx->pending_BANNER = TRUE;
2569 sx->outblock.cmd_count = 1;
2570 }
2571 else
2572 #endif
2573 if (!smtp_reap_banner(sx))
2574 goto RESPONSE_FAILED;
2575
2576 if (sx->lmtp)
2577 greeting_cmd = US"LHLO";
2578 else if (sx->esmtp)
2579 greeting_cmd = US"EHLO";
2580 else
2581 {
2582 greeting_cmd = US"HELO";
2583 DEBUG(D_transport)
2584 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2585 }
2586
2587 if (smtp_write_command(sx,
2588 #ifdef EXPERIMENTAL_PIPE_CONNECT
2589 sx->early_pipe_active ? SCMD_BUFFER :
2590 #endif
2591 SCMD_FLUSH,
2592 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2593 goto SEND_FAILED;
2594
2595 #ifdef EXPERIMENTAL_PIPE_CONNECT
2596 if (sx->early_pipe_active)
2597 sx->pending_EHLO = TRUE;
2598 else
2599 #endif
2600 {
2601 if (!smtp_reap_ehlo(sx))
2602 goto RESPONSE_FAILED;
2603 smtp_peer_options = 0;
2604 }
2605 }
2606
2607 /* If the host is required to use a secure channel, ensure that we
2608 have one. */
2609
2610 else if ( sx->smtps
2611 # ifdef SUPPORT_DANE
2612 || sx->dane
2613 # endif
2614 # ifdef EXPERIMENTAL_REQUIRETLS
2615 || tls_requiretls & REQUIRETLS_MSG
2616 # endif
2617 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2618 )
2619 {
2620 errno =
2621 # ifdef EXPERIMENTAL_REQUIRETLS
2622 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2623 # endif
2624 ERRNO_TLSREQUIRED;
2625 message = string_sprintf("a TLS session is required, but %s",
2626 smtp_peer_options & OPTION_TLS
2627 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2628 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2629 if (sx->dane)
2630 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2631 smtp_peer_options & OPTION_TLS
2632 ? US"validation-failure" /* could do with better detail */
2633 : US"starttls-not-supported");
2634 # endif
2635 goto TLS_FAILED;
2636 }
2637 #endif /*SUPPORT_TLS*/
2638
2639 /* If TLS is active, we have just started it up and re-done the EHLO command,
2640 so its response needs to be analyzed. If TLS is not active and this is a
2641 continued session down a previously-used socket, we haven't just done EHLO, so
2642 we skip this. */
2643
2644 if (continue_hostname == NULL
2645 #ifdef SUPPORT_TLS
2646 || tls_out.active.sock >= 0
2647 #endif
2648 )
2649 {
2650 if (sx->esmtp || sx->lmtp)
2651 {
2652 #ifdef EXPERIMENTAL_PIPE_CONNECT
2653 if (!sx->early_pipe_active)
2654 #endif
2655 {
2656 sx->peer_offered = ehlo_response(sx->buffer,
2657 0 /* no TLS */
2658 #ifdef EXPERIMENTAL_PIPE_CONNECT
2659 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2660 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2661 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2662 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2663
2664 #else
2665
2666 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2667 | OPTION_CHUNKING
2668 | OPTION_PRDR
2669 # ifdef SUPPORT_I18N
2670 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2671 /*XXX if we hand peercaps on to continued-conn processes,
2672 must not depend on this addr */
2673 # endif
2674 | OPTION_DSN
2675 | OPTION_PIPE
2676 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2677 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2678 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2679 # endif
2680 #endif
2681 );
2682 #ifdef EXPERIMENTAL_PIPE_CONNECT
2683 if (tls_out.active.sock >= 0)
2684 sx->ehlo_resp.crypted_features = sx->peer_offered;
2685 #endif
2686 }
2687
2688 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2689 lmtp_ignore_quota option was set. */
2690
2691 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2692
2693 /* If the response to EHLO specified support for the SIZE parameter, note
2694 this, provided size_addition is non-negative. */
2695
2696 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2697
2698 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2699 the current host, esmtp will be false, so PIPELINING can never be used. If
2700 the current host matches hosts_avoid_pipelining, don't do it. */
2701
2702 if ( sx->peer_offered & OPTION_PIPE
2703 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2704 smtp_peer_options |= OPTION_PIPE;
2705
2706 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2707 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2708
2709 if ( sx->peer_offered & OPTION_CHUNKING
2710 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2711 sx->peer_offered &= ~OPTION_CHUNKING;
2712
2713 if (sx->peer_offered & OPTION_CHUNKING)
2714 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2715
2716 #ifndef DISABLE_PRDR
2717 if ( sx->peer_offered & OPTION_PRDR
2718 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2719 sx->peer_offered &= ~OPTION_PRDR;
2720
2721 if (sx->peer_offered & OPTION_PRDR)
2722 DEBUG(D_transport) debug_printf("PRDR usable\n");
2723 #endif
2724
2725 /* Note if the server supports DSN */
2726 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2727 DEBUG(D_transport) debug_printf("%susing DSN\n",
2728 sx->peer_offered & OPTION_DSN ? "" : "not ");
2729
2730 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2731 if (sx->peer_offered & OPTION_REQUIRETLS)
2732 {
2733 smtp_peer_options |= OPTION_REQUIRETLS;
2734 DEBUG(D_transport) debug_printf(
2735 tls_requiretls & REQUIRETLS_MSG
2736 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2737 }
2738 #endif
2739
2740 #ifdef EXPERIMENTAL_PIPE_CONNECT
2741 if ( sx->early_pipe_ok
2742 && !sx->early_pipe_active
2743 && tls_out.active.sock >= 0
2744 && smtp_peer_options & OPTION_PIPE
2745 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2746 & OPTION_EARLY_PIPE)
2747 {
2748 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2749 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2750 write_ehlo_cache_entry(sx);
2751 }
2752 #endif
2753
2754 /* Note if the response to EHLO specifies support for the AUTH extension.
2755 If it has, check that this host is one we want to authenticate to, and do
2756 the business. The host name and address must be available when the
2757 authenticator's client driver is running. */
2758
2759 switch (yield = smtp_auth(sx))
2760 {
2761 default: goto SEND_QUIT;
2762 case OK: break;
2763 case FAIL_SEND: goto SEND_FAILED;
2764 case FAIL: goto RESPONSE_FAILED;
2765 }
2766 }
2767 }
2768 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2769
2770 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2771 message-specific. */
2772
2773 sx->setting_up = FALSE;
2774
2775 #ifdef SUPPORT_I18N
2776 if (sx->addrlist->prop.utf8_msg)
2777 {
2778 uschar * s;
2779
2780 /* If the transport sets a downconversion mode it overrides any set by ACL
2781 for the message. */
2782
2783 if ((s = ob->utf8_downconvert))
2784 {
2785 if (!(s = expand_string(s)))
2786 {
2787 message = string_sprintf("failed to expand utf8_downconvert: %s",
2788 expand_string_message);
2789 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2790 yield = DEFER;
2791 goto SEND_QUIT;
2792 }
2793 switch (*s)
2794 {
2795 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2796 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2797 break;
2798 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2799 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2800 break;
2801 case '-': if (s[1] == '1')
2802 {
2803 sx->addrlist->prop.utf8_downcvt = FALSE;
2804 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2805 }
2806 break;
2807 }
2808 }
2809
2810 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2811 && !sx->addrlist->prop.utf8_downcvt_maybe;
2812 DEBUG(D_transport) if (!sx->utf8_needed)
2813 debug_printf("utf8: %s downconvert\n",
2814 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2815 }
2816
2817 /* If this is an international message we need the host to speak SMTPUTF8 */
2818 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2819 {
2820 errno = ERRNO_UTF8_FWD;
2821 goto RESPONSE_FAILED;
2822 }
2823 #endif /*SUPPORT_I18N*/
2824
2825 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2826 /*XXX should tls_requiretls actually be per-addr? */
2827
2828 if ( tls_requiretls & REQUIRETLS_MSG
2829 && !(sx->peer_offered & OPTION_REQUIRETLS)
2830 )
2831 {
2832 sx->setting_up = TRUE;
2833 errno = ERRNO_REQUIRETLS;
2834 message = US"REQUIRETLS support is required from the server"
2835 " but it was not offered";
2836 DEBUG(D_transport) debug_printf("%s\n", message);
2837 goto TLS_FAILED;
2838 }
2839 #endif
2840
2841 return OK;
2842
2843
2844 {
2845 int code;
2846
2847 RESPONSE_FAILED:
2848 message = NULL;
2849 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2850 sx->buffer, &code, &message, &pass_message);
2851 yield = DEFER;
2852 goto FAILED;
2853
2854 SEND_FAILED:
2855 code = '4';
2856 message = US string_sprintf("send() to %s [%s] failed: %s",
2857 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2858 sx->send_quit = FALSE;
2859 yield = DEFER;
2860 goto FAILED;
2861
2862 EHLOHELO_FAILED:
2863 code = '4';
2864 message = string_sprintf("Remote host closed connection in response to %s"
2865 " (EHLO response was: %s)", smtp_command, sx->buffer);
2866 sx->send_quit = FALSE;
2867 yield = DEFER;
2868 goto FAILED;
2869
2870 /* This label is jumped to directly when a TLS negotiation has failed,
2871 or was not done for a host for which it is required. Values will be set
2872 in message and errno, and setting_up will always be true. Treat as
2873 a temporary error. */
2874
2875 #ifdef SUPPORT_TLS
2876 TLS_FAILED:
2877 # ifdef EXPERIMENTAL_REQUIRETLS
2878 if (errno == ERRNO_REQUIRETLS)
2879 code = '5', yield = FAIL;
2880 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2881 else
2882 # endif
2883 code = '4', yield = DEFER;
2884 goto FAILED;
2885 #endif
2886
2887 /* The failure happened while setting up the call; see if the failure was
2888 a 5xx response (this will either be on connection, or following HELO - a 5xx
2889 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2890 fail all addresses, as this host is never going to accept them. For other
2891 errors during setting up (timeouts or whatever), defer all addresses, and
2892 yield DEFER, so that the host is not tried again for a while.
2893
2894 XXX This peeking for another host feels like a layering violation. We want
2895 to note the host as unusable, but down here we shouldn't know if this was
2896 the last host to try for the addr(list). Perhaps the upper layer should be
2897 the one to do set_errno() ? The problem is that currently the addr is where
2898 errno etc. are stashed, but until we run out of hosts to try the errors are
2899 host-specific. Maybe we should enhance the host_item definition? */
2900
2901 FAILED:
2902 sx->ok = FALSE; /* For when reached by GOTO */
2903 set_errno(sx->addrlist, errno, message,
2904 sx->conn_args.host->next
2905 ? DEFER
2906 : code == '5'
2907 #ifdef SUPPORT_I18N
2908 || errno == ERRNO_UTF8_FWD
2909 #endif
2910 ? FAIL : DEFER,
2911 pass_message, sx->conn_args.host
2912 #ifdef EXPERIMENTAL_DSN_INFO
2913 , sx->smtp_greeting, sx->helo_response
2914 #endif
2915 );
2916 }
2917
2918
2919 SEND_QUIT:
2920
2921 if (sx->send_quit)
2922 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2923
2924 #ifdef SUPPORT_TLS
2925 if (sx->cctx.tls_ctx)
2926 {
2927 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2928 sx->cctx.tls_ctx = NULL;
2929 }
2930 #endif
2931
2932 /* Close the socket, and return the appropriate value, first setting
2933 works because the NULL setting is passed back to the calling process, and
2934 remote_max_parallel is forced to 1 when delivering over an existing connection,
2935 */
2936
2937 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2938 if (sx->send_quit)
2939 {
2940 shutdown(sx->cctx.sock, SHUT_WR);
2941 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2942 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2943 i--; /* drain socket */
2944 sx->send_quit = FALSE;
2945 }
2946 (void)close(sx->cctx.sock);
2947 sx->cctx.sock = -1;
2948
2949 #ifndef DISABLE_EVENT
2950 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2951 #endif
2952
2953 continue_transport = NULL;
2954 continue_hostname = NULL;
2955 return yield;
2956 }
2957
2958
2959
2960
2961 /* Create the string of options that will be appended to the MAIL FROM:
2962 in the connection context buffer */
2963
2964 static int
2965 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2966 {
2967 uschar * p = sx->buffer;
2968 address_item * addr;
2969 int address_count;
2970
2971 *p = 0;
2972
2973 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2974 send it, adding something to the message size to allow for imprecision
2975 and things that get added en route. Exim keeps the number of lines
2976 in a message, so we can give an accurate value for the original message, but we
2977 need some additional to handle added headers. (Double "." characters don't get
2978 included in the count.) */
2979
2980 if ( message_size > 0
2981 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2982 {
2983 /*XXX problem here under spool_files_wireformat?
2984 Or just forget about lines? Or inflate by a fixed proportion? */
2985
2986 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2987 while (*p) p++;
2988 }
2989
2990 #ifndef DISABLE_PRDR
2991 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2992 request that */
2993
2994 sx->prdr_active = FALSE;
2995 if (sx->peer_offered & OPTION_PRDR)
2996 for (address_item * addr = addrlist; addr; addr = addr->next)
2997 if (addr->transport_return == PENDING_DEFER)
2998 {
2999 for (addr = addr->next; addr; addr = addr->next)
3000 if (addr->transport_return == PENDING_DEFER)
3001 { /* at least two recipients to send */
3002 sx->prdr_active = TRUE;
3003 sprintf(CS p, " PRDR"); p += 5;
3004 break;
3005 }
3006 break;
3007 }
3008 #endif
3009
3010 #ifdef SUPPORT_I18N
3011 /* If it supports internationalised messages, and this meesage need that,
3012 request it */
3013
3014 if ( sx->peer_offered & OPTION_UTF8
3015 && addrlist->prop.utf8_msg
3016 && !addrlist->prop.utf8_downcvt
3017 )
3018 Ustrcpy(p, " SMTPUTF8"), p += 9;
3019 #endif
3020
3021 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3022 if (tls_requiretls & REQUIRETLS_MSG)
3023 Ustrcpy(p, " REQUIRETLS") , p += 11;
3024 #endif
3025
3026 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3027 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3028 addr && address_count < sx->max_rcpt;
3029 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3030 {
3031 address_count++;
3032 if (!(addr->dsn_flags & rf_dsnlasthop))
3033 {
3034 sx->dsn_all_lasthop = FALSE;
3035 break;
3036 }
3037 }
3038
3039 /* Add any DSN flags to the mail command */
3040
3041 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3042 {
3043 if (dsn_ret == dsn_ret_hdrs)
3044 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3045 else if (dsn_ret == dsn_ret_full)
3046 { Ustrcpy(p, " RET=FULL"); p += 9; }
3047
3048 if (dsn_envid)
3049 {
3050 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3051 while (*p) p++;
3052 }
3053 }
3054
3055 /* If an authenticated_sender override has been specified for this transport
3056 instance, expand it. If the expansion is forced to fail, and there was already
3057 an authenticated_sender for this message, the original value will be used.
3058 Other expansion failures are serious. An empty result is ignored, but there is
3059 otherwise no check - this feature is expected to be used with LMTP and other
3060 cases where non-standard addresses (e.g. without domains) might be required. */
3061
3062 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3063 return ERROR;
3064
3065 return OK;
3066 }
3067
3068
3069 static void
3070 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3071 {
3072 uschar * p = sx->buffer;
3073 *p = 0;
3074
3075 /* Add any DSN flags to the rcpt command */
3076
3077 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3078 {
3079 if (addr->dsn_flags & rf_dsnflags)
3080 {
3081 BOOL first = TRUE;
3082
3083 Ustrcpy(p, " NOTIFY=");
3084 while (*p) p++;
3085 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3086 {
3087 if (!first) *p++ = ',';
3088 first = FALSE;
3089 Ustrcpy(p, rf_names[i]);
3090 while (*p) p++;
3091 }
3092 }
3093
3094 if (addr->dsn_orcpt)
3095 {
3096 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3097 addr->dsn_orcpt);
3098 while (*p) p++;
3099 }
3100 }
3101 }
3102
3103
3104
3105 /*
3106 Return:
3107 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3108 -1 MAIL response error
3109 -2 any non-MAIL read i/o error
3110 -3 non-MAIL response timeout
3111 -4 internal error; channel still usable
3112 -5 transmit failed
3113 */
3114
3115 int
3116 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3117 {
3118 address_item * addr;
3119 int address_count;
3120 int rc;
3121
3122 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3123 {
3124 *yield = ERROR;
3125 return -4;
3126 }
3127
3128 /* From here until we send the DATA command, we can make use of PIPELINING
3129 if the server host supports it. The code has to be able to check the responses
3130 at any point, for when the buffer fills up, so we write it totally generally.
3131 When PIPELINING is off, each command written reports that it has flushed the
3132 buffer. */
3133
3134 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3135
3136 {
3137 uschar * s = sx->from_addr;
3138 #ifdef SUPPORT_I18N
3139 uschar * errstr = NULL;
3140
3141 /* If we must downconvert, do the from-address here. Remember we had to
3142 for the to-addresses (done below), and also (ugly) for re-doing when building
3143 the delivery log line. */
3144
3145 if ( sx->addrlist->prop.utf8_msg
3146 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3147 )
3148 {
3149 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3150 {
3151 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3152 *yield = ERROR;
3153 return -4;
3154 }
3155 setflag(sx->addrlist, af_utf8_downcvt);
3156 }
3157 #endif
3158
3159 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3160 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3161 }
3162
3163 mail_command = string_copy(big_buffer); /* Save for later error message */
3164
3165 switch(rc)
3166 {
3167 case -1: /* Transmission error */
3168 return -5;
3169
3170 case +1: /* Cmd was sent */
3171 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3172 (SOB sx->conn_args.ob)->command_timeout))
3173 {
3174 if (errno == 0 && sx->buffer[0] == '4')
3175 {
3176 errno = ERRNO_MAIL4XX;
3177 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3178 }
3179 return -1;
3180 }
3181 sx->pending_MAIL = FALSE;
3182 break;
3183
3184 /* otherwise zero: command queued for pipeline */
3185 }
3186
3187 /* Pass over all the relevant recipient addresses for this host, which are the
3188 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3189 several before we have to read the responses for those seen so far. This
3190 checking is done by a subroutine because it also needs to be done at the end.
3191 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3192 the next one if not all are sent.
3193
3194 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3195 last address because we want to abort if any recipients have any kind of
3196 problem, temporary or permanent. We know that all recipient addresses will have
3197 the PENDING_DEFER status, because only one attempt is ever made, and we know
3198 that max_rcpt will be large, so all addresses will be done at once.
3199
3200 For verify we flush the pipeline after any (the only) rcpt address. */
3201
3202 for (addr = sx->first_addr, address_count = 0;
3203 addr && address_count < sx->max_rcpt;
3204 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3205 {
3206 int count;
3207 BOOL no_flush;
3208 uschar * rcpt_addr;
3209
3210 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3211 ? dsn_support_yes : dsn_support_no;
3212
3213 address_count++;
3214 no_flush = pipelining_active && !sx->verify
3215 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3216
3217 build_rcptcmd_options(sx, addr);
3218
3219 /* Now send the RCPT command, and process outstanding responses when
3220 necessary. After a timeout on RCPT, we just end the function, leaving the
3221 yield as OK, because this error can often mean that there is a problem with
3222 just one address, so we don't want to delay the host. */
3223
3224 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3225
3226 #ifdef SUPPORT_I18N
3227 if ( testflag(sx->addrlist, af_utf8_downcvt)
3228 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3229 )
3230 {
3231 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3232 errno = ERRNO_EXPANDFAIL;
3233 return -5; /*XXX too harsh? */
3234 }
3235 #endif
3236
3237 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3238 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3239
3240 if (count < 0) return -5;
3241 if (count > 0)
3242 {
3243 switch(sync_responses(sx, count, 0))
3244 {
3245 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3246 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3247 break;
3248
3249 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3250 if (!sx->lmtp) /* can't tell about progress yet */
3251 sx->completed_addr = TRUE;
3252 case 0: /* No 2xx or 5xx, but no probs */
3253 break;
3254
3255 case -1: return -3; /* Timeout on RCPT */
3256 case -2: return -2; /* non-MAIL read i/o error */
3257 default: return -1; /* any MAIL error */
3258
3259 #ifdef EXPERIMENTAL_PIPE_CONNECT
3260 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3261 #endif
3262 }
3263 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3264 }
3265 } /* Loop for next address */
3266
3267 sx->next_addr = addr;
3268 return 0;
3269 }
3270
3271
3272 #ifdef SUPPORT_TLS
3273 /*****************************************************
3274 * Proxy TLS connection for another transport process *
3275 ******************************************************/
3276 /*
3277 Close the unused end of the pipe, fork once more, then use the given buffer
3278 as a staging area, and select on both the given fd and the TLS'd client-fd for
3279 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3280 Do blocking full-size writes, and reads under a timeout. Once both input
3281 channels are closed, exit the process.
3282
3283 Arguments:
3284 ct_ctx tls context
3285 buf space to use for buffering
3286 bufsiz size of buffer
3287 pfd pipe filedescriptor array; [0] is comms to proxied process
3288 timeout per-read timeout, seconds
3289 */
3290
3291 void
3292 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3293 int timeout)
3294 {
3295 fd_set rfds, efds;
3296 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3297 int rc, i;
3298
3299 close(pfd[1]);
3300 if ((rc = fork()))
3301 {
3302 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3303 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3304 }
3305
3306 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3307 set_process_info("proxying TLS connection for continued transport");
3308 FD_ZERO(&rfds);
3309 FD_SET(tls_out.active.sock, &rfds);
3310 FD_SET(pfd[0], &rfds);
3311
3312 for (int fd_bits = 3; fd_bits; )
3313 {
3314 time_t time_left = timeout;
3315 time_t time_start = time(NULL);
3316
3317 /* wait for data */
3318 efds = rfds;
3319 do
3320 {
3321 struct timeval tv = { time_left, 0 };
3322
3323 rc = select(max_fd,
3324 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3325
3326 if (rc < 0 && errno == EINTR)
3327 if ((time_left -= time(NULL) - time_start) > 0) continue;
3328
3329 if (rc <= 0)
3330 {
3331 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3332 goto done;
3333 }
3334
3335 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3336 {
3337 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3338 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3339 goto done;
3340 }
3341 }
3342 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3343
3344 /* handle inbound data */
3345 if (FD_ISSET(tls_out.active.sock, &rfds))
3346 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3347 {
3348 fd_bits &= ~1;
3349 FD_CLR(tls_out.active.sock, &rfds);
3350 shutdown(pfd[0], SHUT_WR);
3351 timeout = 5;
3352 }
3353 else
3354 {
3355 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3356 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3357 }
3358 else if (fd_bits & 1)
3359 FD_SET(tls_out.active.sock, &rfds);
3360
3361 /* handle outbound data */
3362 if (FD_ISSET(pfd[0], &rfds))
3363 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3364 {
3365 fd_bits = 0;
3366 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3367 ct_ctx = NULL;
3368 }
3369 else
3370 {
3371 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3372 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3373 goto done;
3374 }
3375 else if (fd_bits & 2)
3376 FD_SET(pfd[0], &rfds);
3377 }
3378
3379 done:
3380 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3381 exim_exit(0, US"TLS proxy");
3382 }
3383 #endif
3384
3385
3386 /*************************************************
3387 * Deliver address list to given host *
3388 *************************************************/
3389
3390 /* If continue_hostname is not null, we get here only when continuing to
3391 deliver down an existing channel. The channel was passed as the standard
3392 input. TLS is never active on a passed channel; the previous process always
3393 closes it down before passing the connection on.
3394
3395 Otherwise, we have to make a connection to the remote host, and do the
3396 initial protocol exchange.
3397
3398 When running as an MUA wrapper, if the sender or any recipient is rejected,
3399 temporarily or permanently, we force failure for all recipients.
3400
3401 Arguments:
3402 addrlist chain of potential addresses to deliver; only those whose
3403 transport_return field is set to PENDING_DEFER are currently
3404 being processed; others should be skipped - they have either
3405 been delivered to an earlier host or IP address, or been
3406 failed by one of them.
3407 host host to deliver to
3408 host_af AF_INET or AF_INET6
3409 defport default TCP/IP port to use if host does not specify, in host
3410 byte order
3411 interface interface to bind to, or NULL
3412 tblock transport instance block
3413 message_defer set TRUE if yield is OK, but all addresses were deferred
3414 because of a non-recipient, non-host failure, that is, a
3415 4xx response to MAIL FROM, DATA, or ".". This is a defer
3416 that is specific to the message.
3417 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3418 a second attempt after TLS initialization fails
3419
3420 Returns: OK - the connection was made and the delivery attempted;
3421 the result for each address is in its data block.
3422 DEFER - the connection could not be made, or something failed
3423 while setting up the SMTP session, or there was a
3424 non-message-specific error, such as a timeout.
3425 ERROR - a filter command is specified for this transport,
3426 and there was a problem setting it up; OR helo_data
3427 or add_headers or authenticated_sender is specified
3428 for this transport, and the string failed to expand
3429 */
3430
3431 static int
3432 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3433 uschar *interface, transport_instance *tblock,
3434 BOOL *message_defer, BOOL suppress_tls)
3435 {
3436 address_item *addr;
3437 smtp_transport_options_block * ob = SOB tblock->options_block;
3438 int yield = OK;
3439 int save_errno;
3440 int rc;
3441 struct timeval start_delivery_time;
3442
3443 BOOL pass_message = FALSE;
3444 uschar *message = NULL;
3445 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3446
3447 smtp_context sx;
3448
3449 gettimeofday(&start_delivery_time, NULL);
3450 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3451 *message_defer = FALSE;
3452
3453 sx.addrlist = addrlist;
3454 sx.conn_args.host = host;
3455 sx.conn_args.host_af = host_af,
3456 sx.port = defport;
3457 sx.conn_args.interface = interface;
3458 sx.helo_data = NULL;
3459 sx.conn_args.tblock = tblock;
3460 sx.verify = FALSE;
3461 sx.sync_addr = sx.first_addr = addrlist;
3462
3463 /* Get the channel set up ready for a message (MAIL FROM being the next
3464 SMTP command to send */
3465
3466 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3467 return rc;
3468
3469 /* If there is a filter command specified for this transport, we can now
3470 set it up. This cannot be done until the identify of the host is known. */
3471
3472 if (tblock->filter_command)
3473 {
3474 transport_filter_timeout = tblock->filter_timeout;
3475
3476 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3477 yield ERROR. */
3478
3479 if (!transport_set_up_command(&transport_filter_argv,
3480 tblock->filter_command, TRUE, DEFER, addrlist,
3481 string_sprintf("%.50s transport", tblock->name), NULL))
3482 {
3483 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3484 FALSE);
3485 yield = ERROR;
3486 goto SEND_QUIT;
3487 }
3488
3489 if ( transport_filter_argv
3490 && *transport_filter_argv
3491 && **transport_filter_argv
3492 && sx.peer_offered & OPTION_CHUNKING
3493 )
3494 {
3495 sx.peer_offered &= ~OPTION_CHUNKING;
3496 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3497 }
3498 }
3499
3500 /* For messages that have more than the maximum number of envelope recipients,
3501 we want to send several transactions down the same SMTP connection. (See
3502 comments in deliver.c as to how this reconciles, heuristically, with
3503 remote_max_parallel.) This optimization was added to Exim after the following
3504 code was already working. The simplest way to put it in without disturbing the
3505 code was to use a goto to jump back to this point when there is another
3506 transaction to handle. */
3507
3508 SEND_MESSAGE:
3509 sx.from_addr = return_path;
3510 sx.sync_addr = sx.first_addr;
3511 sx.ok = FALSE;
3512 sx.send_rset = TRUE;
3513 sx.completed_addr = FALSE;
3514
3515
3516 /* If we are a continued-connection-after-verify the MAIL and RCPT
3517 commands were already sent; do not re-send but do mark the addrs as
3518 having been accepted up to RCPT stage. A traditional cont-conn
3519 always has a sequence number greater than one. */
3520
3521 if (continue_hostname && continue_sequence == 1)
3522 {
3523 sx.peer_offered = smtp_peer_options;
3524 sx.pending_MAIL = FALSE;
3525 sx.ok = TRUE;
3526 sx.next_addr = NULL;
3527
3528 for (address_item * addr = addrlist; addr; addr = addr->next)
3529 addr->transport_return = PENDING_OK;
3530 }
3531 else
3532 {
3533 /* Initiate a message transfer. */
3534
3535 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3536 {
3537 case 0: break;
3538 case -1: case -2: goto RESPONSE_FAILED;
3539 case -3: goto END_OFF;
3540 case -4: goto SEND_QUIT;
3541 default: goto SEND_FAILED;
3542 }
3543
3544 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3545 permanently or temporarily. We should have flushed and synced after the last
3546 RCPT. */
3547
3548 if (mua_wrapper)
3549 {
3550 address_item * a;
3551 unsigned cnt;
3552
3553 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3554 if (a->transport_return != PENDING_OK)
3555 {
3556 /*XXX could we find a better errno than 0 here? */
3557 set_errno_nohost(addrlist, 0, a->message, FAIL,
3558 testflag(a, af_pass_message));
3559 sx.ok = FALSE;
3560 break;
3561 }
3562 }
3563 }
3564
3565 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3566 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3567 have a good recipient buffered up if we are pipelining. We don't want to waste
3568 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3569 are pipelining. The responses are all handled by sync_responses().
3570 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3571 to send is. */
3572
3573 if ( !(sx.peer_offered & OPTION_CHUNKING)
3574 && (sx.ok || (pipelining_active && !mua_wrapper)))
3575 {
3576 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3577
3578 if (count < 0) goto SEND_FAILED;
3579 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3580 {
3581 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3582 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3583 break;
3584
3585 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3586 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3587 case 0: break; /* No 2xx or 5xx, but no probs */
3588
3589 case -1: goto END_OFF; /* Timeout on RCPT */
3590
3591 #ifdef EXPERIMENTAL_PIPE_CONNECT
3592 case -4: HDEBUG(D_transport)
3593 debug_printf("failed reaping pipelined cmd responses\n");
3594 #endif
3595 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3596 }
3597 pipelining_active = FALSE;
3598 data_command = string_copy(big_buffer); /* Save for later error message */
3599 }
3600
3601 /* If there were no good recipients (but otherwise there have been no
3602 problems), just set ok TRUE, since we have handled address-specific errors
3603 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3604 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3605 well as body. Set the appropriate timeout value to be used for each chunk.
3606 (Haven't been able to make it work using select() for writing yet.) */
3607
3608 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3609 {
3610 /* Save the first address of the next batch. */
3611 sx.first_addr = sx.next_addr;
3612
3613 sx.ok = TRUE;
3614 }
3615 else
3616 {
3617 transport_ctx tctx = {
3618 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3619 .tblock = tblock,
3620 .addr = addrlist,
3621 .check_string = US".",
3622 .escape_string = US"..", /* Escaping strings */
3623 .options =
3624 topt_use_crlf | topt_escape_headers
3625 | (tblock->body_only ? topt_no_headers : 0)
3626 | (tblock->headers_only ? topt_no_body : 0)
3627 | (tblock->return_path_add ? topt_add_return_path : 0)
3628 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3629 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3630 };
3631
3632 /* If using CHUNKING we need a callback from the generic transport
3633 support to us, for the sending of BDAT smtp commands and the reaping
3634 of responses. The callback needs a whole bunch of state so set up
3635 a transport-context structure to be passed around. */
3636
3637 if (sx.peer_offered & OPTION_CHUNKING)
3638 {
3639 tctx.check_string = tctx.escape_string = NULL;
3640 tctx.options |= topt_use_bdat;
3641 tctx.chunk_cb = smtp_chunk_cmd_callback;
3642 sx.pending_BDAT = FALSE;
3643 sx.good_RCPT = sx.ok;
3644 sx.cmd_count = 0;
3645 tctx.smtp_context = &sx;
3646 }
3647 else
3648 tctx.options |= topt_end_dot;
3649
3650 /* Save the first address of the next batch. */
3651 sx.first_addr = sx.next_addr;
3652
3653 /* Responses from CHUNKING commands go in buffer. Otherwise,
3654 there has not been a response. */
3655
3656 sx.buffer[0] = 0;
3657
3658 sigalrm_seen = FALSE;
3659 transport_write_timeout = ob->data_timeout;
3660 smtp_command = US"sending data block"; /* For error messages */
3661 DEBUG(D_transport|D_v)
3662 if (sx.peer_offered & OPTION_CHUNKING)
3663 debug_printf(" will write message using CHUNKING\n");
3664 else
3665 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3666 transport_count = 0;
3667
3668 #ifndef DISABLE_DKIM
3669 dkim_exim_sign_init();
3670 # ifdef EXPERIMENTAL_ARC
3671 {
3672 uschar * s = ob->arc_sign;
3673 if (s)
3674 {
3675 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3676 {
3677 if (!f.expand_string_forcedfail)
3678 {
3679 message = US"failed to expand arc_sign";
3680 sx.ok = FALSE;
3681 goto SEND_FAILED;
3682 }
3683 }
3684 else if (*s)
3685 {
3686 /* Ask dkim code to hash the body for ARC */
3687 (void) arc_ams_setup_sign_bodyhash();
3688 ob->dkim.force_bodyhash = TRUE;
3689 }
3690 }
3691 }
3692 # endif
3693 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3694 #else
3695 sx.ok = transport_write_message(&tctx, 0);
3696 #endif
3697
3698 /* transport_write_message() uses write() because it is called from other
3699 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3700 it can exit with "Broken pipe" as its error. This really means that the
3701 socket got closed at the far end. */
3702
3703 transport_write_timeout = 0; /* for subsequent transports */
3704
3705 /* Failure can either be some kind of I/O disaster (including timeout),
3706 or the failure of a transport filter or the expansion of added headers.
3707 Or, when CHUNKING, it can be a protocol-detected failure. */
3708
3709 if (!sx.ok)
3710 if (message) goto SEND_FAILED;
3711 else goto RESPONSE_FAILED;
3712
3713 /* We used to send the terminating "." explicitly here, but because of
3714 buffering effects at both ends of TCP/IP connections, you don't gain
3715 anything by keeping it separate, so it might as well go in the final
3716 data buffer for efficiency. This is now done by setting the topt_end_dot
3717 flag above. */
3718
3719 smtp_command = US"end of data";
3720
3721 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3722 {
3723 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3724 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3725 {
3726 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3727 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3728 break;
3729
3730 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3731 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3732 case 0: break; /* No 2xx or 5xx, but no probs */
3733
3734 case -1: goto END_OFF; /* Timeout on RCPT */
3735
3736 #ifdef EXPERIMENTAL_PIPE_CONNECT
3737 case -4: HDEBUG(D_transport)
3738 debug_printf("failed reaping pipelined cmd responses\n");
3739 #endif
3740 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3741 }
3742 }
3743
3744 #ifndef DISABLE_PRDR
3745 /* For PRDR we optionally get a partial-responses warning followed by the
3746 individual responses, before going on with the overall response. If we don't
3747 get the warning then deal with per non-PRDR. */
3748
3749 if(sx.prdr_active)
3750 {
3751 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3752 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3753 {
3754 case '2': sx.prdr_active = FALSE;
3755 sx.ok = TRUE;
3756 break;
3757 case '4': errno = ERRNO_DATA4XX;
3758 addrlist->more_errno |=
3759 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3760 break;
3761 }
3762 }
3763 else
3764 #endif
3765
3766 /* For non-PRDR SMTP, we now read a single response that applies to the
3767 whole message. If it is OK, then all the addresses have been delivered. */
3768
3769 if (!sx.lmtp)
3770 {
3771 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3772 ob->final_timeout);
3773 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3774 {
3775 errno = ERRNO_DATA4XX;
3776 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3777 }
3778 }
3779
3780 /* For LMTP, we get back a response for every RCPT command that we sent;
3781 some may be accepted and some rejected. For those that get a response, their
3782 status is fixed; any that are accepted have been handed over, even if later
3783 responses crash - at least, that's how I read RFC 2033.
3784
3785 If all went well, mark the recipient addresses as completed, record which
3786 host/IPaddress they were delivered to, and cut out RSET when sending another
3787 message down the same channel. Write the completed addresses to the journal
3788 now so that they are recorded in case there is a crash of hardware or
3789 software before the spool gets updated. Also record the final SMTP
3790 confirmation if needed (for SMTP only). */
3791
3792 if (sx.ok)
3793 {
3794 int flag = '=';
3795 struct timeval delivery_time;
3796 int len;
3797 uschar * conf = NULL;
3798
3799 timesince(&delivery_time, &start_delivery_time);
3800 sx.send_rset = FALSE;
3801 pipelining_active = FALSE;
3802
3803 /* Set up confirmation if needed - applies only to SMTP */
3804
3805 if (
3806 #ifdef DISABLE_EVENT
3807 LOGGING(smtp_confirmation) &&
3808 #endif
3809 !sx.lmtp
3810 )
3811 {
3812 const uschar *s = string_printing(sx.buffer);
3813 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3814 conf = (s == sx.buffer)? US string_copy(s) : US s;
3815 }
3816
3817 /* Process all transported addresses - for LMTP or PRDR, read a status for
3818 each one. */
3819
3820 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3821 {
3822 if (addr->transport_return != PENDING_OK) continue;
3823
3824 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3825 remaining addresses. Otherwise, it's a return code for just the one
3826 address. For temporary errors, add a retry item for the address so that
3827 it doesn't get tried again too soon. */
3828
3829 #ifndef DISABLE_PRDR
3830 if (sx.lmtp || sx.prdr_active)
3831 #else
3832 if (sx.lmtp)
3833 #endif
3834 {
3835 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3836 ob->final_timeout))
3837 {
3838 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3839 addr->message = string_sprintf(
3840 #ifndef DISABLE_PRDR
3841 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3842 #else
3843 "LMTP error after %s: %s",
3844 #endif
3845 data_command, string_printing(sx.buffer));
3846 setflag(addr, af_pass_message); /* Allow message to go to user */
3847 if (sx.buffer[0] == '5')
3848 addr->transport_return = FAIL;
3849 else
3850 {
3851 errno = ERRNO_DATA4XX;
3852 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3853 addr->transport_return = DEFER;
3854 #ifndef DISABLE_PRDR
3855 if (!sx.prdr_active)
3856 #endif
3857 retry_add_item(addr, addr->address_retry_key, 0);
3858 }
3859 continue;
3860 }
3861 sx.completed_addr = TRUE; /* NOW we can set this flag */
3862 if (LOGGING(smtp_confirmation))
3863 {
3864 const uschar *s = string_printing(sx.buffer);
3865 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3866 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3867 }
3868 }
3869
3870 /* SMTP, or success return from LMTP for this address. Pass back the
3871 actual host that was used. */
3872
3873 addr->transport_return = OK;
3874 addr->more_errno = delivery_time.tv_sec;
3875 addr->delivery_usec = delivery_time.tv_usec;
3876 addr->host_used = host;
3877 addr->special_action = flag;
3878 addr->message = conf;
3879
3880 if (tcp_out_fastopen)
3881 {
3882 setflag(addr, af_tcp_fastopen_conn);
3883 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3884 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3885 }
3886 if (sx.pipelining_used) setflag(addr, af_pipelining);
3887 #ifdef EXPERIMENTAL_PIPE_CONNECT
3888 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3889 #endif
3890 #ifndef DISABLE_PRDR
3891 if (sx.prdr_active) setflag(addr, af_prdr_used);
3892 #endif
3893 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3894 flag = '-';
3895
3896 #ifndef DISABLE_PRDR
3897 if (!sx.prdr_active)
3898 #endif
3899 {
3900 /* Update the journal. For homonymic addresses, use the base address plus
3901 the transport name. See lots of comments in deliver.c about the reasons
3902 for the complications when homonyms are involved. Just carry on after
3903 write error, as it may prove possible to update the spool file later. */
3904
3905 if (testflag(addr, af_homonym))
3906 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3907 else
3908 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3909
3910 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3911 len = Ustrlen(CS sx.buffer);
3912 if (write(journal_fd, sx.buffer, len) != len)
3913 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3914 "%s: %s", sx.buffer, strerror(errno));
3915 }
3916 }
3917
3918 #ifndef DISABLE_PRDR
3919 if (sx.prdr_active)
3920 {
3921 const uschar * overall_message;
3922
3923 /* PRDR - get the final, overall response. For any non-success
3924 upgrade all the address statuses. */
3925
3926 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3927 ob->final_timeout);
3928 if (!sx.ok)
3929 {
3930 if(errno == 0 && sx.buffer[0] == '4')
3931 {
3932 errno = ERRNO_DATA4XX;
3933 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3934 }
3935 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3936 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3937 addr->transport_return = PENDING_OK; /* allow set_errno action */
3938 goto RESPONSE_FAILED;
3939 }
3940
3941 /* Append the overall response to the individual PRDR response for logging
3942 and update the journal, or setup retry. */
3943
3944 overall_message = string_printing(sx.buffer);
3945 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3946 if (addr->transport_return == OK)
3947 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3948
3949 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3950 if (addr->transport_return == OK)
3951 {
3952 if (testflag(addr, af_homonym))
3953 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3954 else
3955 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3956
3957 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3958 len = Ustrlen(CS sx.buffer);
3959 if (write(journal_fd, sx.buffer, len) != len)
3960 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3961 "%s: %s", sx.buffer, strerror(errno));
3962 }
3963 else if (addr->transport_return == DEFER)
3964 retry_add_item(addr, addr->address_retry_key, -2);
3965 }
3966 #endif
3967
3968 /* Ensure the journal file is pushed out to disk. */
3969
3970 if (EXIMfsync(journal_fd) < 0)
3971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3972 strerror(errno));
3973 }
3974 }
3975
3976
3977 /* Handle general (not specific to one address) failures here. The value of ok
3978 is used to skip over this code on the falling through case. A timeout causes a
3979 deferral. Other errors may defer or fail according to the response code, and
3980 may set up a special errno value, e.g. after connection chopped, which is
3981 assumed if errno == 0 and there is no text in the buffer. If control reaches
3982 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3983 the problem is not related to this specific message. */
3984
3985 if (!sx.ok)
3986 {
3987 int code, set_rc;
3988 uschar * set_message;
3989
3990 RESPONSE_FAILED:
3991 {
3992 save_errno = errno;
3993 message = NULL;
3994 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3995 sx.buffer, &code, &message, &pass_message);
3996 goto FAILED;
3997 }
3998
3999 SEND_FAILED:
4000 {
4001 save_errno = errno;
4002 code = '4';
4003 message = string_sprintf("send() to %s [%s] failed: %s",
4004 host->name, host->address, message ? message : US strerror(save_errno));
4005 sx.send_quit = FALSE;
4006 goto FAILED;
4007 }
4008
4009 FAILED:
4010 {
4011 BOOL message_error;
4012
4013 sx.ok = FALSE; /* For when reached by GOTO */
4014 set_message = message;
4015
4016 /* We want to handle timeouts after MAIL or "." and loss of connection after
4017 "." specially. They can indicate a problem with the sender address or with
4018 the contents of the message rather than a real error on the connection. These
4019 cases are treated in the same way as a 4xx response. This next bit of code
4020 does the classification. */
4021
4022 switch(save_errno)
4023 {
4024 case 0:
4025 case ERRNO_MAIL4XX:
4026 case ERRNO_DATA4XX:
4027 message_error = TRUE;
4028 break;
4029
4030 case ETIMEDOUT:
4031 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4032 Ustrncmp(smtp_command,"end ",4) == 0;
4033 break;
4034
4035 case ERRNO_SMTPCLOSED:
4036 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4037 break;
4038
4039 default:
4040 message_error = FALSE;
4041 break;
4042 }
4043
4044 /* Handle the cases that are treated as message errors. These are:
4045
4046 (a) negative response or timeout after MAIL
4047 (b) negative response after DATA
4048 (c) negative response or timeout or dropped connection after "."
4049 (d) utf8 support required and not offered
4050
4051 It won't be a negative response or timeout after RCPT, as that is dealt
4052 with separately above. The action in all cases is to set an appropriate
4053 error code for all the addresses, but to leave yield set to OK because the
4054 host itself has not failed. Of course, it might in practice have failed
4055 when we've had a timeout, but if so, we'll discover that at the next
4056 delivery attempt. For a temporary error, set the message_defer flag, and
4057 write to the logs for information if this is not the last host. The error
4058 for the last host will be logged as part of the address's log line. */
4059
4060 if (message_error)
4061 {
4062 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4063
4064 /* If there's an errno, the message contains just the identity of
4065 the host. */
4066
4067 if (code == '5')
4068 set_rc = FAIL;
4069 else /* Anything other than 5 is treated as temporary */
4070 {
4071 set_rc = DEFER;
4072 if (save_errno > 0)
4073 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4074
4075 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4076
4077 *message_defer = TRUE;
4078 }
4079 }
4080
4081 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4082 ".", or some other transportation error. We defer all addresses and yield
4083 DEFER, except for the case of failed add_headers expansion, or a transport
4084 filter failure, when the yield should be ERROR, to stop it trying other
4085 hosts. */
4086
4087 else
4088 {
4089 #ifdef EXPERIMENTAL_PIPE_CONNECT
4090 /* If we were early-pipelinng and the actual EHLO response did not match
4091 the cached value we assumed, we could have detected it and passed a
4092 custom errno through to here. It would be nice to RSET and retry right
4093 away, but to reliably do that we eould need an extra synch point before
4094 we committed to data and that would discard half the gained roundrips.
4095 Or we could summarily drop the TCP connection. but that is also ugly.
4096 Instead, we ignore the possibility (having freshened the cache) and rely
4097 on the server telling us with a nonmessage error if we have tried to
4098 do something it no longer supports. */
4099 #endif
4100 set_rc = DEFER;
4101 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4102 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4103 }
4104 }
4105
4106 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4107 #ifdef EXPERIMENTAL_DSN_INFO
4108 , sx.smtp_greeting, sx.helo_response
4109 #endif
4110 );
4111 }
4112
4113
4114 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4115 SMTP session tidily. However, if there were too many addresses to send in one
4116 message (indicated by first_addr being non-NULL) we want to carry on with the
4117 rest of them. Also, it is desirable to send more than one message down the SMTP
4118 connection if there are several waiting, provided we haven't already sent so
4119 many as to hit the configured limit. The function transport_check_waiting looks
4120 for a waiting message and returns its id. Then transport_pass_socket tries to
4121 set up a continued delivery by passing the socket on to another process. The
4122 variable send_rset is FALSE if a message has just been successfully transferred.
4123
4124 If we are already sending down a continued channel, there may be further
4125 addresses not yet delivered that are aimed at the same host, but which have not
4126 been passed in this run of the transport. In this case, continue_more will be
4127 true, and all we should do is send RSET if necessary, and return, leaving the
4128 channel open.
4129
4130 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4131 do not want to continue with other messages down the same channel, because that
4132 can lead to looping between two or more messages, all with the same,
4133 temporarily failing address(es). [The retry information isn't updated yet, so
4134 new processes keep on trying.] We probably also don't want to try more of this
4135 message's addresses either.
4136
4137 If we have started a TLS session, we have to end it before passing the
4138 connection to a new process. However, not all servers can handle this (Exim
4139 can), so we do not pass such a connection on if the host matches
4140 hosts_nopass_tls. */
4141
4142 DEBUG(D_transport)
4143 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4144 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4145 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4146
4147 if (sx.completed_addr && sx.ok && sx.send_quit)
4148 {
4149 BOOL more;
4150 smtp_compare_t t_compare;
4151
4152 t_compare.tblock = tblock;
4153 t_compare.current_sender_address = sender_address;
4154
4155 if ( sx.first_addr != NULL
4156 || f.continue_more
4157 || (
4158 #ifdef SUPPORT_TLS
4159 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4160 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4161 )
4162 &&
4163 #endif
4164 transport_check_waiting(tblock->name, host->name,
4165 tblock->connection_max_messages, new_message_id, &more,
4166 (oicf)smtp_are_same_identities, (void*)&t_compare)
4167 ) )
4168 {
4169 uschar *msg;
4170 BOOL pass_message;
4171
4172 if (sx.send_rset)
4173 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4174 {
4175 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4176 host->address, strerror(errno));
4177 sx.send_quit = FALSE;
4178 }
4179 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4180 '2', ob->command_timeout)))
4181 {
4182 int code;
4183 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4184 &pass_message);
4185 if (!sx.send_quit)
4186 {
4187 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4188 host->name, host->address, msg);
4189 }
4190 }
4191
4192 /* Either RSET was not needed, or it succeeded */
4193
4194 if (sx.ok)
4195 {
4196 #ifdef SUPPORT_TLS
4197 int pfd[2];
4198 #endif
4199 int socket_fd = sx.cctx.sock;
4200
4201
4202 if (sx.first_addr != NULL) /* More addresses still to be sent */
4203 { /* in this run of the transport */
4204 continue_sequence++; /* Causes * in logging */
4205 goto SEND_MESSAGE;
4206 }
4207
4208 /* Unless caller said it already has more messages listed for this host,
4209 pass the connection on to a new Exim process (below, the call to
4210 transport_pass_socket). If the caller has more ready, just return with
4211 the connection still open. */
4212
4213 #ifdef SUPPORT_TLS
4214 if (tls_out.active.sock >= 0)
4215 if ( f.continue_more
4216 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4217 {
4218 /* Before passing the socket on, or returning to caller with it still
4219 open, we must shut down TLS. Not all MTAs allow for the continuation
4220 of the SMTP session when TLS is shut down. We test for this by sending
4221 a new EHLO. If we don't get a good response, we don't attempt to pass
4222 the socket on. */
4223
4224 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4225 sx.cctx.tls_ctx = NULL;
4226 smtp_peer_options = smtp_peer_options_wrap;
4227 sx.ok = !sx.smtps
4228 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4229 >= 0
4230 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4231 '2', ob->command_timeout);
4232
4233 if (sx.ok && f.continue_more)
4234 return yield; /* More addresses for another run */
4235 }
4236 else
4237 {
4238 /* Set up a pipe for proxying TLS for the new transport process */
4239
4240 smtp_peer_options |= OPTION_TLS;
4241 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4242 socket_fd = pfd[1];
4243 else
4244 set_errno(sx.first_addr, errno, US"internal allocation problem",
4245 DEFER, FALSE, host
4246 # ifdef EXPERIMENTAL_DSN_INFO
4247 , sx.smtp_greeting, sx.helo_response
4248 # endif
4249 );
4250 }
4251 else
4252 #endif
4253 if (f.continue_more)
4254 return yield; /* More addresses for another run */
4255
4256 /* If the socket is successfully passed, we mustn't send QUIT (or
4257 indeed anything!) from here. */
4258
4259 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4260 propagate it from the initial
4261 */
4262 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4263 host->address, new_message_id, socket_fd))
4264 {
4265 sx.send_quit = FALSE;
4266
4267 /* We have passed the client socket to a fresh transport process.
4268 If TLS is still active, we need to proxy it for the transport we
4269 just passed the baton to. Fork a child to to do it, and return to
4270 get logging done asap. Which way to place the work makes assumptions
4271 about post-fork prioritisation which may not hold on all platforms. */
4272 #ifdef SUPPORT_TLS
4273 if (tls_out.active.sock >= 0)
4274 {
4275 int pid = fork();
4276 if (pid == 0) /* child; fork again to disconnect totally */
4277 {
4278 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4279 /* does not return */
4280 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4281 ob->command_timeout);
4282 }
4283
4284 if (pid > 0) /* parent */
4285 {
4286 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4287 close(pfd[0]);
4288 /* tidy the inter-proc to disconn the proxy proc */
4289 waitpid(pid, NULL, 0);
4290 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4291 sx.cctx.tls_ctx = NULL;
4292 (void)close(sx.cctx.sock);
4293 sx.cctx.sock = -1;
4294 continue_transport = NULL;
4295 continue_hostname = NULL;
4296 return yield;
4297 }
4298 log_write(0, LOG_PANIC_DIE, "fork failed");
4299 }
4300 #endif
4301 }
4302 }
4303
4304 /* If RSET failed and there are addresses left, they get deferred. */
4305 else
4306 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4307 #ifdef EXPERIMENTAL_DSN_INFO
4308 , sx.smtp_greeting, sx.helo_response
4309 #endif
4310 );
4311 }
4312 }
4313
4314 /* End off tidily with QUIT unless the connection has died or the socket has
4315 been passed to another process. There has been discussion on the net about what
4316 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4317 to wait for a response, but on the other hand, there isn't anything one can do
4318 with an error response, other than log it. Exim used to do that. However,
4319 further discussion suggested that it is positively advantageous not to wait for
4320 the response, but to close the session immediately. This is supposed to move
4321 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4322 load from the server. (Hosts that are both servers and clients may not see much
4323 difference, of course.) Further discussion indicated that this was safe to do
4324 on Unix systems which have decent implementations of TCP/IP that leave the
4325 connection around for a while (TIME_WAIT) after the application has gone away.
4326 This enables the response sent by the server to be properly ACKed rather than
4327 timed out, as can happen on broken TCP/IP implementations on other OS.
4328
4329 This change is being made on 31-Jul-98. After over a year of trouble-free
4330 operation, the old commented-out code was removed on 17-Sep-99. */
4331
4332 SEND_QUIT:
4333 #ifdef TCP_CORK
4334 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4335 #endif
4336 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4337
4338 END_OFF:
4339
4340 #ifdef SUPPORT_TLS
4341 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4342 sx.cctx.tls_ctx = NULL;
4343 #endif
4344
4345 /* Close the socket, and return the appropriate value, first setting
4346 works because the NULL setting is passed back to the calling process, and
4347 remote_max_parallel is forced to 1 when delivering over an existing connection,
4348
4349 If all went well and continue_more is set, we shouldn't actually get here if
4350 there are further addresses, as the return above will be taken. However,
4351 writing RSET might have failed, or there may be other addresses whose hosts are
4352 specified in the transports, and therefore not visible at top level, in which
4353 case continue_more won't get set. */
4354
4355 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4356 if (sx.send_quit)
4357 {
4358 shutdown(sx.cctx.sock, SHUT_WR);
4359 millisleep(f.running_in_test_harness ? 200 : 20);
4360 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4361 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4362 i--; /* drain socket */
4363 }
4364 (void)close(sx.cctx.sock);
4365
4366 #ifndef DISABLE_EVENT
4367 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4368 #endif
4369
4370 continue_transport = NULL;
4371 continue_hostname = NULL;
4372 return yield;
4373 }
4374
4375
4376
4377
4378 /*************************************************
4379 * Closedown entry point *
4380 *************************************************/
4381
4382 /* This function is called when exim is passed an open smtp channel
4383 from another incarnation, but the message which it has been asked
4384 to deliver no longer exists. The channel is on stdin.
4385
4386 We might do fancy things like looking for another message to send down
4387 the channel, but if the one we sought has gone, it has probably been
4388 delivered by some other process that itself will seek further messages,
4389 so just close down our connection.
4390
4391 Argument: pointer to the transport instance block
4392 Returns: nothing
4393 */
4394
4395 void
4396 smtp_transport_closedown(transport_instance *tblock)
4397 {
4398 smtp_transport_options_block * ob = SOB tblock->options_block;
4399 client_conn_ctx cctx;
4400 smtp_context sx;
4401 uschar buffer[256];
4402 uschar inbuffer[4096];
4403 uschar outbuffer[16];
4404
4405 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4406 cctx.sock = fileno(stdin);
4407 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4408
4409 sx.inblock.cctx = &cctx;
4410 sx.inblock.buffer = inbuffer;
4411 sx.inblock.buffersize = sizeof(inbuffer);
4412 sx.inblock.ptr = inbuffer;
4413 sx.inblock.ptrend = inbuffer;
4414
4415 sx.outblock.cctx = &cctx;
4416 sx.outblock.buffersize = sizeof(outbuffer);
4417 sx.outblock.buffer = outbuffer;
4418 sx.outblock.ptr = outbuffer;
4419 sx.outblock.cmd_count = 0;
4420 sx.outblock.authenticating = FALSE;
4421
4422 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4423 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4424 (void)close(cctx.sock);
4425 }
4426
4427
4428
4429 /*************************************************
4430 * Prepare addresses for delivery *
4431 *************************************************/
4432
4433 /* This function is called to flush out error settings from previous delivery
4434 attempts to other hosts. It also records whether we got here via an MX record
4435 or not in the more_errno field of the address. We are interested only in
4436 addresses that are still marked DEFER - others may have got delivered to a
4437 previously considered IP address. Set their status to PENDING_DEFER to indicate
4438 which ones are relevant this time.
4439
4440 Arguments:
4441 addrlist the list of addresses
4442 host the host we are delivering to
4443
4444 Returns: the first address for this delivery
4445 */
4446
4447 static address_item *
4448 prepare_addresses(address_item *addrlist, host_item *host)
4449 {
4450 address_item *first_addr = NULL;
4451 for (address_item * addr = addrlist; addr; addr = addr->next)
4452 if (addr->transport_return == DEFER)
4453 {
4454 if (!first_addr) first_addr = addr;
4455 addr->transport_return = PENDING_DEFER;
4456 addr->basic_errno = 0;
4457 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4458 addr->message = NULL;
4459 #ifdef SUPPORT_TLS
4460 addr->cipher = NULL;
4461 addr->ourcert = NULL;
4462 addr->peercert = NULL;
4463 addr->peerdn = NULL;
4464 addr->ocsp = OCSP_NOT_REQ;
4465 #endif
4466 #ifdef EXPERIMENTAL_DSN_INFO
4467 addr->smtp_greeting = NULL;
4468 addr->helo_response = NULL;
4469 #endif
4470 }
4471 return first_addr;
4472 }
4473
4474
4475
4476 /*************************************************
4477 * Main entry point *
4478 *************************************************/
4479
4480 /* See local README for interface details. As this is a remote transport, it is
4481 given a chain of addresses to be delivered in one connection, if possible. It
4482 always returns TRUE, indicating that each address has its own independent
4483 status set, except if there is a setting up problem, in which case it returns
4484 FALSE. */
4485
4486 BOOL
4487 smtp_transport_entry(
4488 transport_instance *tblock, /* data for this instantiation */
4489 address_item *addrlist) /* addresses we are working on */
4490 {
4491 int defport;
4492 int hosts_defer = 0;
4493 int hosts_fail = 0;
4494 int hosts_looked_up = 0;
4495 int hosts_retry = 0;
4496 int hosts_serial = 0;
4497 int hosts_total = 0;
4498 int total_hosts_tried = 0;
4499 address_item *addr;
4500 BOOL expired = TRUE;
4501 uschar *expanded_hosts = NULL;
4502 uschar *pistring;
4503 uschar *tid = string_sprintf("%s transport", tblock->name);
4504 smtp_transport_options_block *ob = SOB tblock->options_block;
4505 host_item *hostlist = addrlist->host_list;
4506 host_item *host;
4507
4508 DEBUG(D_transport)
4509 {
4510 debug_printf("%s transport entered\n", tblock->name);
4511 for (address_item * addr = addrlist; addr; addr = addr->next)
4512 debug_printf(" %s\n", addr->address);
4513 if (hostlist)
4514 {
4515 debug_printf("hostlist:\n");
4516 for (host_item * host = hostlist; host; host = host->next)
4517 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4518 }
4519 if (continue_hostname)
4520 debug_printf("already connected to %s [%s] (on fd %d)\n",
4521 continue_hostname, continue_host_address,
4522 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4523 }
4524
4525 /* Set the flag requesting that these hosts be added to the waiting
4526 database if the delivery fails temporarily or if we are running with
4527 queue_smtp or a 2-stage queue run. This gets unset for certain
4528 kinds of error, typically those that are specific to the message. */
4529
4530 update_waiting = TRUE;
4531
4532 /* If a host list is not defined for the addresses - they must all have the
4533 same one in order to be passed to a single transport - or if the transport has
4534 a host list with hosts_override set, use the host list supplied with the
4535 transport. It is an error for this not to exist. */
4536
4537 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
4538 if (tls_requiretls & REQUIRETLS_MSG)
4539 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
4540 rather than modifying the transport? */
4541 #endif
4542
4543 if (!hostlist || (ob->hosts_override && ob->hosts))
4544 {
4545 if (!ob->hosts)
4546 {
4547 addrlist->message = string_sprintf("%s transport called with no hosts set",
4548 tblock->name);
4549 addrlist->transport_return = PANIC;
4550 return FALSE; /* Only top address has status */
4551 }
4552
4553 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4554 ob->hosts);
4555
4556 /* If the transport's host list contains no '$' characters, and we are not
4557 randomizing, it is fixed and therefore a chain of hosts can be built once
4558 and for all, and remembered for subsequent use by other calls to this
4559 transport. If, on the other hand, the host list does contain '$', or we are
4560 randomizing its order, we have to rebuild it each time. In the fixed case,
4561 as the hosts string will never be used again, it doesn't matter that we
4562 replace all the : characters with zeros. */
4563
4564 if (!ob->hostlist)
4565 {
4566 uschar *s = ob->hosts;
4567
4568 if (Ustrchr(s, '$') != NULL)
4569 {
4570 if (!(expanded_hosts = expand_string(s)))
4571 {
4572 addrlist->message = string_sprintf("failed to expand list of hosts "
4573 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4574 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4575 return FALSE; /* Only top address has status */
4576 }
4577 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4578 "\"%s\"\n", s, expanded_hosts);
4579 s = expanded_hosts;
4580 }
4581 else
4582 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4583
4584 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4585
4586 /* Check that the expansion yielded something useful. */
4587 if (!hostlist)
4588 {
4589 addrlist->message =
4590 string_sprintf("%s transport has empty hosts setting", tblock->name);
4591 addrlist->transport_return = PANIC;
4592 return FALSE; /* Only top address has status */
4593 }
4594
4595 /* If there was no expansion of hosts, save the host list for
4596 next time. */
4597
4598 if (!expanded_hosts) ob->hostlist = hostlist;
4599 }
4600
4601 /* This is not the first time this transport has been run in this delivery;
4602 the host list was built previously. */
4603
4604 else
4605 hostlist = ob->hostlist;
4606 }
4607
4608 /* The host list was supplied with the address. If hosts_randomize is set, we
4609 must sort it into a random order if it did not come from MX records and has not
4610 already been randomized (but don't bother if continuing down an existing
4611 connection). */
4612
4613 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4614 {
4615 host_item *newlist = NULL;
4616 while (hostlist)
4617 {
4618 host_item *h = hostlist;
4619 hostlist = hostlist->next;
4620
4621 h->sort_key = random_number(100);
4622
4623 if (!newlist)
4624 {
4625 h->next = NULL;
4626 newlist = h;
4627 }
4628 else if (h->sort_key < newlist->sort_key)
4629 {
4630 h->next = newlist;
4631 newlist = h;
4632 }
4633 else
4634 {
4635 host_item *hh = newlist;
4636 while (hh->next)
4637 {
4638 if (h->sort_key < hh->next->sort_key) break;
4639 hh = hh->next;
4640 }
4641 h->next = hh->next;
4642 hh->next = h;
4643 }
4644 }
4645
4646 hostlist = addrlist->host_list = newlist;
4647 }
4648
4649 /* Sort out the default port. */
4650
4651 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4652
4653 /* For each host-plus-IP-address on the list:
4654
4655 . If this is a continued delivery and the host isn't the one with the
4656 current connection, skip.
4657
4658 . If the status is unusable (i.e. previously failed or retry checked), skip.
4659
4660 . If no IP address set, get the address, either by turning the name into
4661 an address, calling gethostbyname if gethostbyname is on, or by calling
4662 the DNS. The DNS may yield multiple addresses, in which case insert the
4663 extra ones into the list.
4664
4665 . Get the retry data if not previously obtained for this address and set the
4666 field which remembers the state of this address. Skip if the retry time is
4667 not reached. If not, remember whether retry data was found. The retry string
4668 contains both the name and the IP address.
4669
4670 . Scan the list of addresses and mark those whose status is DEFER as
4671 PENDING_DEFER. These are the only ones that will be processed in this cycle
4672 of the hosts loop.
4673
4674 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4675 Some addresses may be successfully delivered, others may fail, and yet
4676 others may get temporary errors and so get marked DEFER.
4677
4678 . The return from the delivery attempt is OK if a connection was made and a
4679 valid SMTP dialogue was completed. Otherwise it is DEFER.
4680
4681 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4682
4683 . If fail to connect, or other defer state, add a retry item.
4684
4685 . If there are any addresses whose status is still DEFER, carry on to the
4686 next host/IPaddress, unless we have tried the number of hosts given
4687 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4688 there is some fancy logic for hosts_max_try that means its limit can be
4689 overstepped in some circumstances.
4690
4691 If we get to the end of the list, all hosts have deferred at least one address,
4692 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4693 delivery attempt to those hosts whose last try was before the arrival time of
4694 the current message. To cope with this, we have to go round the loop a second
4695 time. After that, set the status and error data for any addresses that haven't
4696 had it set already. */
4697
4698 for (int cutoff_retry = 0;
4699 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4700 cutoff_retry++)
4701 {
4702 host_item *nexthost = NULL;
4703 int unexpired_hosts_tried = 0;
4704 BOOL continue_host_tried = FALSE;
4705
4706 retry_non_continued:
4707 for (host = hostlist;
4708 host
4709 && unexpired_hosts_tried < ob->hosts_max_try
4710 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4711 host = nexthost)
4712 {
4713 int rc;
4714 int host_af;
4715 uschar *rs;
4716 BOOL host_is_expired = FALSE;
4717 BOOL message_defer = FALSE;
4718 BOOL some_deferred = FALSE;
4719 address_item *first_addr = NULL;
4720 uschar *interface = NULL;
4721 uschar *retry_host_key = NULL;
4722 uschar *retry_message_key = NULL;
4723 uschar *serialize_key = NULL;
4724
4725 /* Default next host is next host. :-) But this can vary if the
4726 hosts_max_try limit is hit (see below). It may also be reset if a host
4727 address is looked up here (in case the host was multihomed). */
4728
4729 nexthost = host->next;
4730
4731 /* If the address hasn't yet been obtained from the host name, look it up
4732 now, unless the host is already marked as unusable. If it is marked as
4733 unusable, it means that the router was unable to find its IP address (in
4734 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4735 the lookup failed last time. We don't get this far if *all* MX records
4736 point to non-existent hosts; that is treated as a hard error.
4737
4738 We can just skip this host entirely. When the hosts came from the router,
4739 the address will timeout based on the other host(s); when the address is
4740 looked up below, there is an explicit retry record added.
4741
4742 Note that we mustn't skip unusable hosts if the address is not unset; they
4743 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4744
4745 if (!host->address)
4746 {
4747 int new_port, flags;
4748
4749 if (host->status >= hstatus_unusable)
4750 {
4751 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4752 host->name);
4753 continue;
4754 }
4755
4756 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4757
4758 /* The host name is permitted to have an attached port. Find it, and
4759 strip it from the name. Just remember it for now. */
4760
4761 new_port = host_item_get_port(host);
4762
4763 /* Count hosts looked up */
4764
4765 hosts_looked_up++;
4766
4767 /* Find by name if so configured, or if it's an IP address. We don't
4768 just copy the IP address, because we need the test-for-local to happen. */
4769
4770 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4771 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4772 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4773
4774 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4775 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4776 else
4777 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4778 &ob->dnssec, /* domains for request/require */
4779 NULL, NULL);
4780
4781 /* Update the host (and any additional blocks, resulting from
4782 multihoming) with a host-specific port, if any. */
4783
4784 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4785
4786 /* Failure to find the host at this time (usually DNS temporary failure)
4787 is really a kind of routing failure rather than a transport failure.
4788 Therefore we add a retry item of the routing kind, not to stop us trying
4789 to look this name up here again, but to ensure the address gets timed
4790 out if the failures go on long enough. A complete failure at this point
4791 commonly points to a configuration error, but the best action is still
4792 to carry on for the next host. */
4793
4794 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4795 {
4796 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4797 expired = FALSE;
4798 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4799 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4800 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4801 host->status = hstatus_unusable;
4802
4803 for (address_item * addr = addrlist; addr; addr = addr->next)
4804 {
4805 if (addr->transport_return != DEFER) continue;
4806 addr->basic_errno = ERRNO_UNKNOWNHOST;
4807 addr->message = string_sprintf(
4808 rc == HOST_FIND_SECURITY
4809 ? "lookup of IP address for %s was insecure"
4810 : "failed to lookup IP address for %s",
4811 host->name);
4812 }
4813 continue;
4814 }
4815
4816 /* If the host is actually the local host, we may have a problem, or
4817 there may be some cunning configuration going on. In the problem case,
4818 log things and give up. The default transport status is already DEFER. */
4819
4820 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4821 {
4822 for (address_item * addr = addrlist; addr; addr = addr->next)
4823 {
4824 addr->basic_errno = 0;
4825 addr->message = string_sprintf("%s transport found host %s to be "
4826 "local", tblock->name, host->name);
4827 }
4828 goto END_TRANSPORT;
4829 }
4830 } /* End of block for IP address lookup */
4831
4832 /* If this is a continued delivery, we are interested only in the host
4833 which matches the name of the existing open channel. The check is put
4834 here after the local host lookup, in case the name gets expanded as a
4835 result of the lookup. Set expired FALSE, to save the outer loop executing
4836 twice. */
4837
4838 if (continue_hostname)
4839 if ( Ustrcmp(continue_hostname, host->name) != 0
4840 || Ustrcmp(continue_host_address, host->address) != 0
4841 )
4842 {
4843 expired = FALSE;
4844 continue; /* With next host */
4845 }
4846 else
4847 continue_host_tried = TRUE;
4848
4849 /* Reset the default next host in case a multihomed host whose addresses
4850 are not looked up till just above added to the host list. */
4851
4852 nexthost = host->next;
4853
4854 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4855 domain is in queue_smtp_domains, we don't actually want to attempt any
4856 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4857 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4858 were not in it. We don't want to hold up all SMTP deliveries! Except when
4859 doing a two-stage queue run, don't do this if forcing. */
4860
4861 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4862 match_isinlist(addrlist->domain,
4863 (const uschar **)&queue_smtp_domains, 0,
4864 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4865 {
4866 expired = FALSE;
4867 for (address_item * addr = addrlist; addr; addr = addr->next)
4868 if (addr->transport_return == DEFER)
4869 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4870 continue; /* With next host */
4871 }
4872
4873 /* Count hosts being considered - purely for an intelligent comment
4874 if none are usable. */
4875
4876 hosts_total++;
4877
4878 /* Set $host and $host address now in case they are needed for the
4879 interface expansion or the serialize_hosts check; they remain set if an
4880 actual delivery happens. */
4881
4882 deliver_host = host->name;
4883 deliver_host_address = host->address;
4884 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4885 : host->dnssec == DS_NO ? US"no"
4886 : US"";
4887
4888 /* Set up a string for adding to the retry key if the port number is not
4889 the standard SMTP port. A host may have its own port setting that overrides
4890 the default. */
4891
4892 pistring = string_sprintf(":%d", host->port == PORT_NONE
4893 ? defport : host->port);
4894 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4895
4896 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4897 string is set, even if constant (as different transports can have different
4898 constant settings), we must add it to the key that is used for retries,
4899 because connections to the same host from a different interface should be
4900 treated separately. */
4901
4902 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4903 if ((rs = ob->interface) && *rs)
4904 {
4905 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4906 return FALSE;
4907 pistring = string_sprintf("%s/%s", pistring, interface);
4908 }
4909
4910 /* The first time round the outer loop, check the status of the host by
4911 inspecting the retry data. The second time round, we are interested only
4912 in expired hosts that haven't been tried since this message arrived. */
4913
4914 if (cutoff_retry == 0)
4915 {
4916 BOOL incl_ip;
4917 /* Ensure the status of the address is set by checking retry data if
4918 necessary. There may be host-specific retry data (applicable to all
4919 messages) and also data for retries of a specific message at this host.
4920 If either of these retry records are actually read, the keys used are
4921 returned to save recomputing them later. */
4922
4923 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4924 US"retry_include_ip_address", ob->retry_include_ip_address,
4925 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4926 continue; /* with next host */
4927
4928 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4929 incl_ip, &retry_host_key, &retry_message_key);
4930
4931 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4932 host->address ? host->address : US"", pistring,
4933 host->status == hstatus_usable ? "usable"
4934 : host->status == hstatus_unusable ? "unusable"
4935 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4936
4937 /* Skip this address if not usable at this time, noting if it wasn't
4938 actually expired, both locally and in the address. */
4939
4940 switch (host->status)
4941 {
4942 case hstatus_unusable:
4943 expired = FALSE;
4944 setflag(addrlist, af_retry_skipped);
4945 /* Fall through */
4946
4947 case hstatus_unusable_expired:
4948 switch (host->why)
4949 {
4950 case hwhy_retry: hosts_retry++; break;
4951 case hwhy_failed: hosts_fail++; break;
4952 case hwhy_insecure:
4953 case hwhy_deferred: hosts_defer++; break;
4954 }
4955
4956 /* If there was a retry message key, implying that previously there
4957 was a message-specific defer, we don't want to update the list of
4958 messages waiting for these hosts. */
4959
4960 if (retry_message_key) update_waiting = FALSE;
4961 continue; /* With the next host or IP address */
4962 }
4963 }
4964
4965 /* Second time round the loop: if the address is set but expired, and
4966 the message is newer than the last try, let it through. */
4967
4968 else
4969 {
4970 if ( !host->address
4971 || host->status != hstatus_unusable_expired
4972 || host->last_try > received_time.tv_sec)
4973 continue;
4974 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4975 host->name, host->address, pistring);
4976 host_is_expired = TRUE;
4977 }
4978
4979 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4980 it remains TRUE only if all hosts are expired and none are actually tried.
4981 */
4982
4983 expired = FALSE;
4984
4985 /* If this host is listed as one to which access must be serialized,
4986 see if another Exim process has a connection to it, and if so, skip
4987 this host. If not, update the database to record our connection to it
4988 and remember this for later deletion. Do not do any of this if we are
4989 sending the message down a pre-existing connection. */
4990
4991 if ( !continue_hostname
4992 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4993 {
4994 serialize_key = string_sprintf("host-serialize-%s", host->name);
4995 if (!enq_start(serialize_key, 1))
4996 {
4997 DEBUG(D_transport)
4998 debug_printf("skipping host %s because another Exim process "
4999 "is connected to it\n", host->name);
5000 hosts_serial++;
5001 continue;
5002 }
5003 }
5004
5005 /* OK, we have an IP address that is not waiting for its retry time to
5006 arrive (it might be expired) OR (second time round the loop) we have an
5007 expired host that hasn't been tried since the message arrived. Have a go
5008 at delivering the message to it. First prepare the addresses by flushing
5009 out the result of previous attempts, and finding the first address that
5010 is still to be delivered. */
5011
5012 first_addr = prepare_addresses(addrlist, host);
5013
5014 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5015 message_id, host->name, host->address, addrlist->address,
5016 addrlist->next ? ", ..." : "");
5017
5018 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5019 message_id, host->name, host->address, pistring, addrlist->address,
5020 addrlist->next ? ", ..." : "");
5021
5022 /* This is not for real; don't do the delivery. If there are
5023 any remaining hosts, list them. */
5024
5025 if (f.dont_deliver)
5026 {
5027 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5028 for (address_item * addr = addrlist; addr; addr = addr->next)
5029 {
5030 addr->host_used = host;
5031 addr->special_action = '*';
5032 addr->message = US"delivery bypassed by -N option";
5033 }
5034 DEBUG(D_transport)
5035 {
5036 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5037 "*** host and remaining hosts:\n", tblock->name);
5038 for (host_item * host2 = host; host2; host2 = host2->next)
5039 debug_printf(" %s [%s]\n", host2->name,
5040 host2->address ? host2->address : US"unset");
5041 }
5042 rc = OK;
5043 }
5044
5045 /* This is for real. If the host is expired, we don't count it for
5046 hosts_max_retry. This ensures that all hosts must expire before an address
5047 is timed out, unless hosts_max_try_hardlimit (which protects against
5048 lunatic DNS configurations) is reached.
5049
5050 If the host is not expired and we are about to hit the hosts_max_retry
5051 limit, check to see if there is a subsequent hosts with a different MX
5052 value. If so, make that the next host, and don't count this one. This is a
5053 heuristic to make sure that different MXs do get tried. With a normal kind
5054 of retry rule, they would get tried anyway when the earlier hosts were
5055 delayed, but if the domain has a "retry every time" type of rule - as is
5056 often used for the the very large ISPs, that won't happen. */
5057
5058 else
5059 {
5060 host_item * thost;
5061 /* Make a copy of the host if it is local to this invocation
5062 of the transport. */
5063
5064 if (expanded_hosts)
5065 {
5066 thost = store_get(sizeof(host_item));
5067 *thost = *host;
5068 thost->name = string_copy(host->name);
5069 thost->address = string_copy(host->address);
5070 }
5071 else
5072 thost = host;
5073
5074 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5075 {
5076 DEBUG(D_transport)
5077 debug_printf("hosts_max_try limit reached with this host\n");
5078 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5079 {
5080 nexthost = h;
5081 unexpired_hosts_tried--;
5082 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5083 "and will be tried\n");
5084 break;
5085 }
5086 }
5087
5088 /* Attempt the delivery. */
5089
5090 total_hosts_tried++;
5091 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5092 &message_defer, FALSE);
5093
5094 /* Yield is one of:
5095 OK => connection made, each address contains its result;
5096 message_defer is set for message-specific defers (when all
5097 recipients are marked defer)
5098 DEFER => there was a non-message-specific delivery problem;
5099 ERROR => there was a problem setting up the arguments for a filter,
5100 or there was a problem with expanding added headers
5101 */
5102
5103 /* If the result is not OK, there was a non-message-specific problem.
5104 If the result is DEFER, we need to write to the logs saying what happened
5105 for this particular host, except in the case of authentication and TLS
5106 failures, where the log has already been written. If all hosts defer a
5107 general message is written at the end. */
5108
5109 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5110 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5111 write_logs(host, first_addr->message, first_addr->basic_errno);
5112
5113 #ifndef DISABLE_EVENT
5114 if (rc == DEFER)
5115 deferred_event_raise(first_addr, host);
5116 #endif
5117
5118 /* If STARTTLS was accepted, but there was a failure in setting up the
5119 TLS session (usually a certificate screwup), and the host is not in
5120 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5121 TLS forcibly turned off. We have to start from scratch with a new SMTP
5122 connection. That's why the retry is done from here, not from within
5123 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5124 session, so the in-clear transmission after those errors, if permitted,
5125 happens inside smtp_deliver().] */
5126
5127 #ifdef SUPPORT_TLS
5128 if ( rc == DEFER
5129 && first_addr->basic_errno == ERRNO_TLSFAILURE
5130 && ob->tls_tempfail_tryclear
5131 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5132 )
5133 {
5134 log_write(0, LOG_MAIN,
5135 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5136 first_addr->message, host->name, host->address);
5137 first_addr = prepare_addresses(addrlist, host);
5138 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5139 &message_defer, TRUE);
5140 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5141 write_logs(host, first_addr->message, first_addr->basic_errno);
5142 # ifndef DISABLE_EVENT
5143 if (rc == DEFER)
5144 deferred_event_raise(first_addr, host);
5145 # endif
5146 }
5147 #endif /*SUPPORT_TLS*/
5148 }
5149
5150 /* Delivery attempt finished */
5151
5152 rs = rc == OK ? US"OK"
5153 : rc == DEFER ? US"DEFER"
5154 : rc == ERROR ? US"ERROR"
5155 : US"?";
5156
5157 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5158 message_id, host->name, host->address, pistring, addrlist->address,
5159 addrlist->next ? " (& others)" : "", rs);
5160
5161 /* Release serialization if set up */
5162
5163 if (serialize_key) enq_end(serialize_key);
5164
5165 /* If the result is DEFER, or if a host retry record is known to exist, we
5166 need to add an item to the retry chain for updating the retry database
5167 at the end of delivery. We only need to add the item to the top address,
5168 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5169 for any other delivery attempts using the same address. (It is copied into
5170 the unusable tree at the outer level, so even if different address blocks
5171 contain the same address, it still won't get tried again.) */
5172
5173 if (rc == DEFER || retry_host_key)
5174 {
5175 int delete_flag = rc != DEFER ? rf_delete : 0;
5176 if (!retry_host_key)
5177 {
5178 BOOL incl_ip;
5179 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5180 US"retry_include_ip_address", ob->retry_include_ip_address,
5181 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5182 incl_ip = TRUE; /* error; use most-specific retry record */
5183
5184 retry_host_key = incl_ip
5185 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5186 : string_sprintf("T:%S%s", host->name, pistring);
5187 }
5188
5189 /* If a delivery of another message over an existing SMTP connection
5190 yields DEFER, we do NOT set up retry data for the host. This covers the
5191 case when there are delays in routing the addresses in the second message
5192 that are so long that the server times out. This is alleviated by not
5193 routing addresses that previously had routing defers when handling an
5194 existing connection, but even so, this case may occur (e.g. if a
5195 previously happily routed address starts giving routing defers). If the
5196 host is genuinely down, another non-continued message delivery will
5197 notice it soon enough. */
5198
5199 if (delete_flag != 0 || !continue_hostname)
5200 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5201
5202 /* We may have tried an expired host, if its retry time has come; ensure
5203 the status reflects the expiry for the benefit of any other addresses. */
5204
5205 if (rc == DEFER)
5206 {
5207 host->status = host_is_expired
5208 ? hstatus_unusable_expired : hstatus_unusable;
5209 host->why = hwhy_deferred;
5210 }
5211 }
5212
5213 /* If message_defer is set (host was OK, but every recipient got deferred
5214 because of some message-specific problem), or if that had happened
5215 previously so that a message retry key exists, add an appropriate item
5216 to the retry chain. Note that if there was a message defer but now there is
5217 a host defer, the message defer record gets deleted. That seems perfectly
5218 reasonable. Also, stop the message from being remembered as waiting
5219 for specific hosts. */
5220
5221 if (message_defer || retry_message_key)
5222 {
5223 int delete_flag = message_defer ? 0 : rf_delete;
5224 if (!retry_message_key)
5225 {
5226 BOOL incl_ip;
5227 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5228 US"retry_include_ip_address", ob->retry_include_ip_address,
5229 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5230 incl_ip = TRUE; /* error; use most-specific retry record */
5231
5232 retry_message_key = incl_ip
5233 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5234 message_id)
5235 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5236 }
5237 retry_add_item(addrlist, retry_message_key,
5238 rf_message | rf_host | delete_flag);
5239 update_waiting = FALSE;
5240 }
5241
5242 /* Any return other than DEFER (that is, OK or ERROR) means that the
5243 addresses have got their final statuses filled in for this host. In the OK
5244 case, see if any of them are deferred. */
5245
5246 if (rc == OK)
5247 for (address_item * addr = addrlist; addr; addr = addr->next)
5248 if (addr->transport_return == DEFER)
5249 {
5250 some_deferred = TRUE;
5251 break;
5252 }
5253
5254 /* If no addresses deferred or the result was ERROR, return. We do this for
5255 ERROR because a failing filter set-up or add_headers expansion is likely to
5256 fail for any host we try. */
5257
5258 if (rc == ERROR || (rc == OK && !some_deferred))
5259 {
5260 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5261 return TRUE; /* Each address has its status */
5262 }
5263
5264 /* If the result was DEFER or some individual addresses deferred, let
5265 the loop run to try other hosts with the deferred addresses, except for the
5266 case when we were trying to deliver down an existing channel and failed.
5267 Don't try any other hosts in this case. */
5268
5269 if (continue_hostname) break;
5270
5271 /* If the whole delivery, or some individual addresses, were deferred and
5272 there are more hosts that could be tried, do not count this host towards
5273 the hosts_max_try limit if the age of the message is greater than the
5274 maximum retry time for this host. This means we may try try all hosts,
5275 ignoring the limit, when messages have been around for some time. This is
5276 important because if we don't try all hosts, the address will never time
5277 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5278
5279 if ((rc == DEFER || some_deferred) && nexthost)
5280 {
5281 BOOL timedout;
5282 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5283
5284 if (retry && retry->rules)
5285 {
5286 retry_rule *last_rule;
5287 for (last_rule = retry->rules;
5288 last_rule->next;
5289 last_rule = last_rule->next);
5290 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5291 }
5292 else timedout = TRUE; /* No rule => timed out */
5293
5294 if (timedout)
5295 {
5296 unexpired_hosts_tried--;
5297 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5298 "hosts_max_try (message older than host's retry time)\n");
5299 }
5300 }
5301
5302 DEBUG(D_transport)
5303 {
5304 if (unexpired_hosts_tried >= ob->hosts_max_try)
5305 debug_printf("reached transport hosts_max_try limit %d\n",
5306 ob->hosts_max_try);
5307 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5308 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5309 ob->hosts_max_try_hardlimit);
5310 }
5311
5312 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5313 } /* End of loop for trying multiple hosts. */
5314
5315 /* If we failed to find a matching host in the list, for an already-open
5316 connection, just close it and start over with the list. This can happen
5317 for routing that changes from run to run, or big multi-IP sites with
5318 round-robin DNS. */
5319
5320 if (continue_hostname && !continue_host_tried)
5321 {
5322 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5323
5324 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5325 #ifdef SUPPORT_TLS
5326 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5327 transport */
5328 /*XXX doublecheck that! */
5329
5330 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5331 {
5332 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5333 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5334 cutthrough.cctx.tls_ctx = NULL;
5335 cutthrough.is_tls = FALSE;
5336 }
5337 else
5338 #else
5339 (void) write(fd, US"QUIT\r\n", 6);
5340 #endif
5341 (void) close(fd);
5342 cutthrough.cctx.sock = -1;
5343 continue_hostname = NULL;
5344 goto retry_non_continued;
5345 }
5346
5347 /* This is the end of the loop that repeats iff expired is TRUE and
5348 ob->delay_after_cutoff is FALSE. The second time round we will
5349 try those hosts that haven't been tried since the message arrived. */
5350
5351 DEBUG(D_transport)
5352 {
5353 debug_printf("all IP addresses skipped or deferred at least one address\n");
5354 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5355 debug_printf("retrying IP addresses not tried since message arrived\n");
5356 }
5357 }
5358
5359
5360 /* Get here if all IP addresses are skipped or defer at least one address. In
5361 MUA wrapper mode, this will happen only for connection or other non-message-
5362 specific failures. Force the delivery status for all addresses to FAIL. */
5363
5364 if (mua_wrapper)
5365 {
5366 for (address_item * addr = addrlist; addr; addr = addr->next)
5367 addr->transport_return = FAIL;
5368 goto END_TRANSPORT;
5369 }
5370
5371 /* In the normal, non-wrapper case, add a standard message to each deferred
5372 address if there hasn't been an error, that is, if it hasn't actually been
5373 tried this time. The variable "expired" will be FALSE if any deliveries were
5374 actually tried, or if there was at least one host that was not expired. That
5375 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5376 a delivery has been tried, an error code will be set, and the failing of the
5377 message is handled by the retry code later.
5378
5379 If queue_smtp is set, or this transport was called to send a subsequent message
5380 down an existing TCP/IP connection, and something caused the host not to be
5381 found, we end up here, but can detect these cases and handle them specially. */
5382
5383 for (address_item * addr = addrlist; addr; addr = addr->next)
5384 {
5385 /* If host is not NULL, it means that we stopped processing the host list
5386 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5387 means we need to behave as if some hosts were skipped because their retry
5388 time had not come. Specifically, this prevents the address from timing out.
5389 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5390 hosts were tried. */
5391
5392 if (host)
5393 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5394 {
5395 DEBUG(D_transport)
5396 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5397 "hosts were tried\n");
5398 }
5399 else
5400 {
5401 DEBUG(D_transport)
5402 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5403 setflag(addr, af_retry_skipped);
5404 }
5405
5406 if (f.queue_smtp) /* no deliveries attempted */
5407 {
5408 addr->transport_return = DEFER;
5409 addr->basic_errno = 0;
5410 addr->message = US"SMTP delivery explicitly queued";
5411 }
5412
5413 else if ( addr->transport_return == DEFER
5414 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5415 && !addr->message
5416 )
5417 {
5418 addr->basic_errno = ERRNO_HRETRY;
5419 if (continue_hostname)
5420 addr->message = US"no host found for existing SMTP connection";
5421 else if (expired)
5422 {
5423 setflag(addr, af_pass_message); /* This is not a security risk */
5424 addr->message = string_sprintf(
5425 "all hosts%s have been failing for a long time %s",
5426 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5427 ob->delay_after_cutoff
5428 ? US"(and retry time not reached)"
5429 : US"and were last tried after this message arrived");
5430
5431 /* If we are already using fallback hosts, or there are no fallback hosts
5432 defined, convert the result to FAIL to cause a bounce. */
5433
5434 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5435 addr->transport_return = FAIL;
5436 }
5437 else
5438 {
5439 const char * s;
5440 if (hosts_retry == hosts_total)
5441 s = "retry time not reached for any host%s";
5442 else if (hosts_fail == hosts_total)
5443 s = "all host address lookups%s failed permanently";
5444 else if (hosts_defer == hosts_total)
5445 s = "all host address lookups%s failed temporarily";
5446 else if (hosts_serial == hosts_total)
5447 s = "connection limit reached for all hosts%s";
5448 else if (hosts_fail+hosts_defer == hosts_total)
5449 s = "all host address lookups%s failed";
5450 else
5451 s = "some host address lookups failed and retry time "
5452 "not reached for other hosts or connection limit reached%s";
5453
5454 addr->message = string_sprintf(s,
5455 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5456 }
5457 }
5458 }
5459
5460 /* Update the database which keeps information about which messages are waiting
5461 for which hosts to become available. For some message-specific errors, the
5462 update_waiting flag is turned off because we don't want follow-on deliveries in
5463 those cases. If this transport instance is explicitly limited to one message
5464 per connection then follow-on deliveries are not possible and there's no need
5465 to create/update the per-transport wait-<transport_name> database. */
5466
5467 if (update_waiting && tblock->connection_max_messages != 1)
5468 transport_update_waiting(hostlist, tblock->name);
5469
5470 END_TRANSPORT:
5471
5472 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5473
5474 return TRUE; /* Each address has its status */
5475 }
5476
5477 #endif /*!MACRO_PREDEF*/
5478 /* vi: aw ai sw=2
5479 */
5480 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.