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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # 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 uschar * errstr;
2475 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2476 sx->addrlist, sx->conn_args.tblock,
2477 # ifdef SUPPORT_DANE
2478 sx->dane ? &tlsa_dnsa : NULL,
2479 # endif
2480 &tls_out, &errstr);
2481
2482 if (!sx->cctx.tls_ctx)
2483 {
2484 /* TLS negotiation failed; give an error. From outside, this function may
2485 be called again to try in clear on a new connection, if the options permit
2486 it for this host. */
2487 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2488
2489 # ifdef SUPPORT_DANE
2490 if (sx->dane)
2491 {
2492 log_write(0, LOG_MAIN,
2493 "DANE attempt failed; TLS connection to %s [%s]: %s",
2494 sx->conn_args.host->name, sx->conn_args.host->address, errstr);
2495 # ifndef DISABLE_EVENT
2496 (void) event_raise(sx->conn_args.tblock->event_action,
2497 US"dane:fail", US"validation-failure"); /* could do with better detail */
2498 # endif
2499 }
2500 # endif
2501
2502 errno = ERRNO_TLSFAILURE;
2503 message = string_sprintf("TLS session: %s", errstr);
2504 sx->send_quit = FALSE;
2505 goto TLS_FAILED;
2506 }
2507
2508 /* TLS session is set up */
2509
2510 smtp_peer_options_wrap = smtp_peer_options;
2511 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2512 if (addr->transport_return == PENDING_DEFER)
2513 {
2514 addr->cipher = tls_out.cipher;
2515 addr->ourcert = tls_out.ourcert;
2516 addr->peercert = tls_out.peercert;
2517 addr->peerdn = tls_out.peerdn;
2518 addr->ocsp = tls_out.ocsp;
2519 }
2520 }
2521 }
2522
2523 /* if smtps, we'll have smtp_command set to something else; always safe to
2524 reset it here. */
2525 smtp_command = big_buffer;
2526
2527 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2528 helo_data is null, we are dealing with a connection that was passed from
2529 another process, and so we won't have expanded helo_data above. We have to
2530 expand it here. $sending_ip_address and $sending_port are set up right at the
2531 start of the Exim process (in exim.c). */
2532
2533 if (tls_out.active.sock >= 0)
2534 {
2535 uschar * greeting_cmd;
2536
2537 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2538 {
2539 uschar *message = string_sprintf("failed to expand helo_data: %s",
2540 expand_string_message);
2541 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2542 yield = DEFER;
2543 goto SEND_QUIT;
2544 }
2545
2546 #ifdef EXPERIMENTAL_PIPE_CONNECT
2547 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2548 We're unlikely to get the group sent and delivered before the server sends its
2549 banner, but it's still worth sending as a group.
2550 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2551 the reverse. */
2552
2553 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2554 {
2555 sx->peer_offered = sx->ehlo_resp.crypted_features;
2556 if ((sx->early_pipe_active =
2557 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2558 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2559 }
2560 #endif
2561
2562 /* For SMTPS we need to wait for the initial OK response. */
2563 if (sx->smtps)
2564 #ifdef EXPERIMENTAL_PIPE_CONNECT
2565 if (sx->early_pipe_active)
2566 {
2567 sx->pending_BANNER = TRUE;
2568 sx->outblock.cmd_count = 1;
2569 }
2570 else
2571 #endif
2572 if (!smtp_reap_banner(sx))
2573 goto RESPONSE_FAILED;
2574
2575 if (sx->lmtp)
2576 greeting_cmd = US"LHLO";
2577 else if (sx->esmtp)
2578 greeting_cmd = US"EHLO";
2579 else
2580 {
2581 greeting_cmd = US"HELO";
2582 DEBUG(D_transport)
2583 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2584 }
2585
2586 if (smtp_write_command(sx,
2587 #ifdef EXPERIMENTAL_PIPE_CONNECT
2588 sx->early_pipe_active ? SCMD_BUFFER :
2589 #endif
2590 SCMD_FLUSH,
2591 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2592 goto SEND_FAILED;
2593
2594 #ifdef EXPERIMENTAL_PIPE_CONNECT
2595 if (sx->early_pipe_active)
2596 sx->pending_EHLO = TRUE;
2597 else
2598 #endif
2599 {
2600 if (!smtp_reap_ehlo(sx))
2601 goto RESPONSE_FAILED;
2602 smtp_peer_options = 0;
2603 }
2604 }
2605
2606 /* If the host is required to use a secure channel, ensure that we
2607 have one. */
2608
2609 else if ( sx->smtps
2610 # ifdef SUPPORT_DANE
2611 || sx->dane
2612 # endif
2613 # ifdef EXPERIMENTAL_REQUIRETLS
2614 || tls_requiretls & REQUIRETLS_MSG
2615 # endif
2616 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2617 )
2618 {
2619 errno =
2620 # ifdef EXPERIMENTAL_REQUIRETLS
2621 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2622 # endif
2623 ERRNO_TLSREQUIRED;
2624 message = string_sprintf("a TLS session is required, but %s",
2625 smtp_peer_options & OPTION_TLS
2626 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2627 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2628 if (sx->dane)
2629 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2630 smtp_peer_options & OPTION_TLS
2631 ? US"validation-failure" /* could do with better detail */
2632 : US"starttls-not-supported");
2633 # endif
2634 goto TLS_FAILED;
2635 }
2636 #endif /*SUPPORT_TLS*/
2637
2638 /* If TLS is active, we have just started it up and re-done the EHLO command,
2639 so its response needs to be analyzed. If TLS is not active and this is a
2640 continued session down a previously-used socket, we haven't just done EHLO, so
2641 we skip this. */
2642
2643 if (continue_hostname == NULL
2644 #ifdef SUPPORT_TLS
2645 || tls_out.active.sock >= 0
2646 #endif
2647 )
2648 {
2649 if (sx->esmtp || sx->lmtp)
2650 {
2651 #ifdef EXPERIMENTAL_PIPE_CONNECT
2652 if (!sx->early_pipe_active)
2653 #endif
2654 {
2655 sx->peer_offered = ehlo_response(sx->buffer,
2656 0 /* no TLS */
2657 #ifdef EXPERIMENTAL_PIPE_CONNECT
2658 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2659 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2660 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2661 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2662
2663 #else
2664
2665 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2666 | OPTION_CHUNKING
2667 | OPTION_PRDR
2668 # ifdef SUPPORT_I18N
2669 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2670 /*XXX if we hand peercaps on to continued-conn processes,
2671 must not depend on this addr */
2672 # endif
2673 | OPTION_DSN
2674 | OPTION_PIPE
2675 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2676 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2677 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2678 # endif
2679 #endif
2680 );
2681 #ifdef EXPERIMENTAL_PIPE_CONNECT
2682 if (tls_out.active.sock >= 0)
2683 sx->ehlo_resp.crypted_features = sx->peer_offered;
2684 #endif
2685 }
2686
2687 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2688 lmtp_ignore_quota option was set. */
2689
2690 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2691
2692 /* If the response to EHLO specified support for the SIZE parameter, note
2693 this, provided size_addition is non-negative. */
2694
2695 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2696
2697 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2698 the current host, esmtp will be false, so PIPELINING can never be used. If
2699 the current host matches hosts_avoid_pipelining, don't do it. */
2700
2701 if ( sx->peer_offered & OPTION_PIPE
2702 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2703 smtp_peer_options |= OPTION_PIPE;
2704
2705 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2706 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2707
2708 if ( sx->peer_offered & OPTION_CHUNKING
2709 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2710 sx->peer_offered &= ~OPTION_CHUNKING;
2711
2712 if (sx->peer_offered & OPTION_CHUNKING)
2713 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2714
2715 #ifndef DISABLE_PRDR
2716 if ( sx->peer_offered & OPTION_PRDR
2717 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2718 sx->peer_offered &= ~OPTION_PRDR;
2719
2720 if (sx->peer_offered & OPTION_PRDR)
2721 DEBUG(D_transport) debug_printf("PRDR usable\n");
2722 #endif
2723
2724 /* Note if the server supports DSN */
2725 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2726 DEBUG(D_transport) debug_printf("%susing DSN\n",
2727 sx->peer_offered & OPTION_DSN ? "" : "not ");
2728
2729 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2730 if (sx->peer_offered & OPTION_REQUIRETLS)
2731 {
2732 smtp_peer_options |= OPTION_REQUIRETLS;
2733 DEBUG(D_transport) debug_printf(
2734 tls_requiretls & REQUIRETLS_MSG
2735 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2736 }
2737 #endif
2738
2739 #ifdef EXPERIMENTAL_PIPE_CONNECT
2740 if ( sx->early_pipe_ok
2741 && !sx->early_pipe_active
2742 && tls_out.active.sock >= 0
2743 && smtp_peer_options & OPTION_PIPE
2744 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2745 & OPTION_EARLY_PIPE)
2746 {
2747 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2748 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2749 write_ehlo_cache_entry(sx);
2750 }
2751 #endif
2752
2753 /* Note if the response to EHLO specifies support for the AUTH extension.
2754 If it has, check that this host is one we want to authenticate to, and do
2755 the business. The host name and address must be available when the
2756 authenticator's client driver is running. */
2757
2758 switch (yield = smtp_auth(sx))
2759 {
2760 default: goto SEND_QUIT;
2761 case OK: break;
2762 case FAIL_SEND: goto SEND_FAILED;
2763 case FAIL: goto RESPONSE_FAILED;
2764 }
2765 }
2766 }
2767 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2768
2769 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2770 message-specific. */
2771
2772 sx->setting_up = FALSE;
2773
2774 #ifdef SUPPORT_I18N
2775 if (sx->addrlist->prop.utf8_msg)
2776 {
2777 uschar * s;
2778
2779 /* If the transport sets a downconversion mode it overrides any set by ACL
2780 for the message. */
2781
2782 if ((s = ob->utf8_downconvert))
2783 {
2784 if (!(s = expand_string(s)))
2785 {
2786 message = string_sprintf("failed to expand utf8_downconvert: %s",
2787 expand_string_message);
2788 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2789 yield = DEFER;
2790 goto SEND_QUIT;
2791 }
2792 switch (*s)
2793 {
2794 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2795 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2796 break;
2797 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2798 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2799 break;
2800 case '-': if (s[1] == '1')
2801 {
2802 sx->addrlist->prop.utf8_downcvt = FALSE;
2803 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2804 }
2805 break;
2806 }
2807 }
2808
2809 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2810 && !sx->addrlist->prop.utf8_downcvt_maybe;
2811 DEBUG(D_transport) if (!sx->utf8_needed)
2812 debug_printf("utf8: %s downconvert\n",
2813 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2814 }
2815
2816 /* If this is an international message we need the host to speak SMTPUTF8 */
2817 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2818 {
2819 errno = ERRNO_UTF8_FWD;
2820 goto RESPONSE_FAILED;
2821 }
2822 #endif /*SUPPORT_I18N*/
2823
2824 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2825 /*XXX should tls_requiretls actually be per-addr? */
2826
2827 if ( tls_requiretls & REQUIRETLS_MSG
2828 && !(sx->peer_offered & OPTION_REQUIRETLS)
2829 )
2830 {
2831 sx->setting_up = TRUE;
2832 errno = ERRNO_REQUIRETLS;
2833 message = US"REQUIRETLS support is required from the server"
2834 " but it was not offered";
2835 DEBUG(D_transport) debug_printf("%s\n", message);
2836 goto TLS_FAILED;
2837 }
2838 #endif
2839
2840 return OK;
2841
2842
2843 {
2844 int code;
2845
2846 RESPONSE_FAILED:
2847 message = NULL;
2848 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2849 sx->buffer, &code, &message, &pass_message);
2850 yield = DEFER;
2851 goto FAILED;
2852
2853 SEND_FAILED:
2854 code = '4';
2855 message = US string_sprintf("send() to %s [%s] failed: %s",
2856 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2857 sx->send_quit = FALSE;
2858 yield = DEFER;
2859 goto FAILED;
2860
2861 EHLOHELO_FAILED:
2862 code = '4';
2863 message = string_sprintf("Remote host closed connection in response to %s"
2864 " (EHLO response was: %s)", smtp_command, sx->buffer);
2865 sx->send_quit = FALSE;
2866 yield = DEFER;
2867 goto FAILED;
2868
2869 /* This label is jumped to directly when a TLS negotiation has failed,
2870 or was not done for a host for which it is required. Values will be set
2871 in message and errno, and setting_up will always be true. Treat as
2872 a temporary error. */
2873
2874 #ifdef SUPPORT_TLS
2875 TLS_FAILED:
2876 # ifdef EXPERIMENTAL_REQUIRETLS
2877 if (errno == ERRNO_REQUIRETLS)
2878 code = '5', yield = FAIL;
2879 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2880 else
2881 # endif
2882 code = '4', yield = DEFER;
2883 goto FAILED;
2884 #endif
2885
2886 /* The failure happened while setting up the call; see if the failure was
2887 a 5xx response (this will either be on connection, or following HELO - a 5xx
2888 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2889 fail all addresses, as this host is never going to accept them. For other
2890 errors during setting up (timeouts or whatever), defer all addresses, and
2891 yield DEFER, so that the host is not tried again for a while.
2892
2893 XXX This peeking for another host feels like a layering violation. We want
2894 to note the host as unusable, but down here we shouldn't know if this was
2895 the last host to try for the addr(list). Perhaps the upper layer should be
2896 the one to do set_errno() ? The problem is that currently the addr is where
2897 errno etc. are stashed, but until we run out of hosts to try the errors are
2898 host-specific. Maybe we should enhance the host_item definition? */
2899
2900 FAILED:
2901 sx->ok = FALSE; /* For when reached by GOTO */
2902 set_errno(sx->addrlist, errno, message,
2903 sx->conn_args.host->next
2904 ? DEFER
2905 : code == '5'
2906 #ifdef SUPPORT_I18N
2907 || errno == ERRNO_UTF8_FWD
2908 #endif
2909 ? FAIL : DEFER,
2910 pass_message, sx->conn_args.host
2911 #ifdef EXPERIMENTAL_DSN_INFO
2912 , sx->smtp_greeting, sx->helo_response
2913 #endif
2914 );
2915 }
2916
2917
2918 SEND_QUIT:
2919
2920 if (sx->send_quit)
2921 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2922
2923 #ifdef SUPPORT_TLS
2924 if (sx->cctx.tls_ctx)
2925 {
2926 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2927 sx->cctx.tls_ctx = NULL;
2928 }
2929 #endif
2930
2931 /* Close the socket, and return the appropriate value, first setting
2932 works because the NULL setting is passed back to the calling process, and
2933 remote_max_parallel is forced to 1 when delivering over an existing connection,
2934 */
2935
2936 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2937 if (sx->send_quit)
2938 {
2939 shutdown(sx->cctx.sock, SHUT_WR);
2940 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2941 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2942 i--; /* drain socket */
2943 sx->send_quit = FALSE;
2944 }
2945 (void)close(sx->cctx.sock);
2946 sx->cctx.sock = -1;
2947
2948 #ifndef DISABLE_EVENT
2949 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2950 #endif
2951
2952 continue_transport = NULL;
2953 continue_hostname = NULL;
2954 return yield;
2955 }
2956
2957
2958
2959
2960 /* Create the string of options that will be appended to the MAIL FROM:
2961 in the connection context buffer */
2962
2963 static int
2964 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2965 {
2966 uschar * p = sx->buffer;
2967 address_item * addr;
2968 int address_count;
2969
2970 *p = 0;
2971
2972 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2973 send it, adding something to the message size to allow for imprecision
2974 and things that get added en route. Exim keeps the number of lines
2975 in a message, so we can give an accurate value for the original message, but we
2976 need some additional to handle added headers. (Double "." characters don't get
2977 included in the count.) */
2978
2979 if ( message_size > 0
2980 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2981 {
2982 /*XXX problem here under spool_files_wireformat?
2983 Or just forget about lines? Or inflate by a fixed proportion? */
2984
2985 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2986 while (*p) p++;
2987 }
2988
2989 #ifndef DISABLE_PRDR
2990 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2991 request that */
2992
2993 sx->prdr_active = FALSE;
2994 if (sx->peer_offered & OPTION_PRDR)
2995 for (address_item * addr = addrlist; addr; addr = addr->next)
2996 if (addr->transport_return == PENDING_DEFER)
2997 {
2998 for (addr = addr->next; addr; addr = addr->next)
2999 if (addr->transport_return == PENDING_DEFER)
3000 { /* at least two recipients to send */
3001 sx->prdr_active = TRUE;
3002 sprintf(CS p, " PRDR"); p += 5;
3003 break;
3004 }
3005 break;
3006 }
3007 #endif
3008
3009 #ifdef SUPPORT_I18N
3010 /* If it supports internationalised messages, and this meesage need that,
3011 request it */
3012
3013 if ( sx->peer_offered & OPTION_UTF8
3014 && addrlist->prop.utf8_msg
3015 && !addrlist->prop.utf8_downcvt
3016 )
3017 Ustrcpy(p, " SMTPUTF8"), p += 9;
3018 #endif
3019
3020 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3021 if (tls_requiretls & REQUIRETLS_MSG)
3022 Ustrcpy(p, " REQUIRETLS") , p += 11;
3023 #endif
3024
3025 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3026 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3027 addr && address_count < sx->max_rcpt;
3028 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3029 {
3030 address_count++;
3031 if (!(addr->dsn_flags & rf_dsnlasthop))
3032 {
3033 sx->dsn_all_lasthop = FALSE;
3034 break;
3035 }
3036 }
3037
3038 /* Add any DSN flags to the mail command */
3039
3040 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3041 {
3042 if (dsn_ret == dsn_ret_hdrs)
3043 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3044 else if (dsn_ret == dsn_ret_full)
3045 { Ustrcpy(p, " RET=FULL"); p += 9; }
3046
3047 if (dsn_envid)
3048 {
3049 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3050 while (*p) p++;
3051 }
3052 }
3053
3054 /* If an authenticated_sender override has been specified for this transport
3055 instance, expand it. If the expansion is forced to fail, and there was already
3056 an authenticated_sender for this message, the original value will be used.
3057 Other expansion failures are serious. An empty result is ignored, but there is
3058 otherwise no check - this feature is expected to be used with LMTP and other
3059 cases where non-standard addresses (e.g. without domains) might be required. */
3060
3061 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3062 return ERROR;
3063
3064 return OK;
3065 }
3066
3067
3068 static void
3069 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3070 {
3071 uschar * p = sx->buffer;
3072 *p = 0;
3073
3074 /* Add any DSN flags to the rcpt command */
3075
3076 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3077 {
3078 if (addr->dsn_flags & rf_dsnflags)
3079 {
3080 BOOL first = TRUE;
3081
3082 Ustrcpy(p, " NOTIFY=");
3083 while (*p) p++;
3084 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3085 {
3086 if (!first) *p++ = ',';
3087 first = FALSE;
3088 Ustrcpy(p, rf_names[i]);
3089 while (*p) p++;
3090 }
3091 }
3092
3093 if (addr->dsn_orcpt)
3094 {
3095 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3096 addr->dsn_orcpt);
3097 while (*p) p++;
3098 }
3099 }
3100 }
3101
3102
3103
3104 /*
3105 Return:
3106 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3107 -1 MAIL response error
3108 -2 any non-MAIL read i/o error
3109 -3 non-MAIL response timeout
3110 -4 internal error; channel still usable
3111 -5 transmit failed
3112 */
3113
3114 int
3115 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3116 {
3117 address_item * addr;
3118 int address_count;
3119 int rc;
3120
3121 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3122 {
3123 *yield = ERROR;
3124 return -4;
3125 }
3126
3127 /* From here until we send the DATA command, we can make use of PIPELINING
3128 if the server host supports it. The code has to be able to check the responses
3129 at any point, for when the buffer fills up, so we write it totally generally.
3130 When PIPELINING is off, each command written reports that it has flushed the
3131 buffer. */
3132
3133 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3134
3135 {
3136 uschar * s = sx->from_addr;
3137 #ifdef SUPPORT_I18N
3138 uschar * errstr = NULL;
3139
3140 /* If we must downconvert, do the from-address here. Remember we had to
3141 for the to-addresses (done below), and also (ugly) for re-doing when building
3142 the delivery log line. */
3143
3144 if ( sx->addrlist->prop.utf8_msg
3145 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3146 )
3147 {
3148 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3149 {
3150 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3151 *yield = ERROR;
3152 return -4;
3153 }
3154 setflag(sx->addrlist, af_utf8_downcvt);
3155 }
3156 #endif
3157
3158 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3159 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3160 }
3161
3162 mail_command = string_copy(big_buffer); /* Save for later error message */
3163
3164 switch(rc)
3165 {
3166 case -1: /* Transmission error */
3167 return -5;
3168
3169 case +1: /* Cmd was sent */
3170 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3171 (SOB sx->conn_args.ob)->command_timeout))
3172 {
3173 if (errno == 0 && sx->buffer[0] == '4')
3174 {
3175 errno = ERRNO_MAIL4XX;
3176 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3177 }
3178 return -1;
3179 }
3180 sx->pending_MAIL = FALSE;
3181 break;
3182
3183 /* otherwise zero: command queued for pipeline */
3184 }
3185
3186 /* Pass over all the relevant recipient addresses for this host, which are the
3187 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3188 several before we have to read the responses for those seen so far. This
3189 checking is done by a subroutine because it also needs to be done at the end.
3190 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3191 the next one if not all are sent.
3192
3193 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3194 last address because we want to abort if any recipients have any kind of
3195 problem, temporary or permanent. We know that all recipient addresses will have
3196 the PENDING_DEFER status, because only one attempt is ever made, and we know
3197 that max_rcpt will be large, so all addresses will be done at once.
3198
3199 For verify we flush the pipeline after any (the only) rcpt address. */
3200
3201 for (addr = sx->first_addr, address_count = 0;
3202 addr && address_count < sx->max_rcpt;
3203 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3204 {
3205 int count;
3206 BOOL no_flush;
3207 uschar * rcpt_addr;
3208
3209 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3210 ? dsn_support_yes : dsn_support_no;
3211
3212 address_count++;
3213 no_flush = pipelining_active && !sx->verify
3214 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3215
3216 build_rcptcmd_options(sx, addr);
3217
3218 /* Now send the RCPT command, and process outstanding responses when
3219 necessary. After a timeout on RCPT, we just end the function, leaving the
3220 yield as OK, because this error can often mean that there is a problem with
3221 just one address, so we don't want to delay the host. */
3222
3223 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3224
3225 #ifdef SUPPORT_I18N
3226 if ( testflag(sx->addrlist, af_utf8_downcvt)
3227 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3228 )
3229 {
3230 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3231 errno = ERRNO_EXPANDFAIL;
3232 return -5; /*XXX too harsh? */
3233 }
3234 #endif
3235
3236 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3237 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3238
3239 if (count < 0) return -5;
3240 if (count > 0)
3241 {
3242 switch(sync_responses(sx, count, 0))
3243 {
3244 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3245 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3246 break;
3247
3248 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3249 if (!sx->lmtp) /* can't tell about progress yet */
3250 sx->completed_addr = TRUE;
3251 case 0: /* No 2xx or 5xx, but no probs */
3252 break;
3253
3254 case -1: return -3; /* Timeout on RCPT */
3255 case -2: return -2; /* non-MAIL read i/o error */
3256 default: return -1; /* any MAIL error */
3257
3258 #ifdef EXPERIMENTAL_PIPE_CONNECT
3259 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3260 #endif
3261 }
3262 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3263 }
3264 } /* Loop for next address */
3265
3266 sx->next_addr = addr;
3267 return 0;
3268 }
3269
3270
3271 #ifdef SUPPORT_TLS
3272 /*****************************************************
3273 * Proxy TLS connection for another transport process *
3274 ******************************************************/
3275 /*
3276 Close the unused end of the pipe, fork once more, then use the given buffer
3277 as a staging area, and select on both the given fd and the TLS'd client-fd for
3278 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3279 Do blocking full-size writes, and reads under a timeout. Once both input
3280 channels are closed, exit the process.
3281
3282 Arguments:
3283 ct_ctx tls context
3284 buf space to use for buffering
3285 bufsiz size of buffer
3286 pfd pipe filedescriptor array; [0] is comms to proxied process
3287 timeout per-read timeout, seconds
3288 */
3289
3290 void
3291 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3292 int timeout)
3293 {
3294 fd_set rfds, efds;
3295 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3296 int rc, i;
3297
3298 close(pfd[1]);
3299 if ((rc = fork()))
3300 {
3301 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3302 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3303 }
3304
3305 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3306 set_process_info("proxying TLS connection for continued transport");
3307 FD_ZERO(&rfds);
3308 FD_SET(tls_out.active.sock, &rfds);
3309 FD_SET(pfd[0], &rfds);
3310
3311 for (int fd_bits = 3; fd_bits; )
3312 {
3313 time_t time_left = timeout;
3314 time_t time_start = time(NULL);
3315
3316 /* wait for data */
3317 efds = rfds;
3318 do
3319 {
3320 struct timeval tv = { time_left, 0 };
3321
3322 rc = select(max_fd,
3323 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3324
3325 if (rc < 0 && errno == EINTR)
3326 if ((time_left -= time(NULL) - time_start) > 0) continue;
3327
3328 if (rc <= 0)
3329 {
3330 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3331 goto done;
3332 }
3333
3334 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3335 {
3336 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3337 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3338 goto done;
3339 }
3340 }
3341 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3342
3343 /* handle inbound data */
3344 if (FD_ISSET(tls_out.active.sock, &rfds))
3345 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3346 {
3347 fd_bits &= ~1;
3348 FD_CLR(tls_out.active.sock, &rfds);
3349 shutdown(pfd[0], SHUT_WR);
3350 timeout = 5;
3351 }
3352 else
3353 {
3354 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3355 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3356 }
3357 else if (fd_bits & 1)
3358 FD_SET(tls_out.active.sock, &rfds);
3359
3360 /* handle outbound data */
3361 if (FD_ISSET(pfd[0], &rfds))
3362 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3363 {
3364 fd_bits = 0;
3365 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3366 ct_ctx = NULL;
3367 }
3368 else
3369 {
3370 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3371 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3372 goto done;
3373 }
3374 else if (fd_bits & 2)
3375 FD_SET(pfd[0], &rfds);
3376 }
3377
3378 done:
3379 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3380 exim_exit(0, US"TLS proxy");
3381 }
3382 #endif
3383
3384
3385 /*************************************************
3386 * Deliver address list to given host *
3387 *************************************************/
3388
3389 /* If continue_hostname is not null, we get here only when continuing to
3390 deliver down an existing channel. The channel was passed as the standard
3391 input. TLS is never active on a passed channel; the previous process always
3392 closes it down before passing the connection on.
3393
3394 Otherwise, we have to make a connection to the remote host, and do the
3395 initial protocol exchange.
3396
3397 When running as an MUA wrapper, if the sender or any recipient is rejected,
3398 temporarily or permanently, we force failure for all recipients.
3399
3400 Arguments:
3401 addrlist chain of potential addresses to deliver; only those whose
3402 transport_return field is set to PENDING_DEFER are currently
3403 being processed; others should be skipped - they have either
3404 been delivered to an earlier host or IP address, or been
3405 failed by one of them.
3406 host host to deliver to
3407 host_af AF_INET or AF_INET6
3408 defport default TCP/IP port to use if host does not specify, in host
3409 byte order
3410 interface interface to bind to, or NULL
3411 tblock transport instance block
3412 message_defer set TRUE if yield is OK, but all addresses were deferred
3413 because of a non-recipient, non-host failure, that is, a
3414 4xx response to MAIL FROM, DATA, or ".". This is a defer
3415 that is specific to the message.
3416 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3417 a second attempt after TLS initialization fails
3418
3419 Returns: OK - the connection was made and the delivery attempted;
3420 the result for each address is in its data block.
3421 DEFER - the connection could not be made, or something failed
3422 while setting up the SMTP session, or there was a
3423 non-message-specific error, such as a timeout.
3424 ERROR - a filter command is specified for this transport,
3425 and there was a problem setting it up; OR helo_data
3426 or add_headers or authenticated_sender is specified
3427 for this transport, and the string failed to expand
3428 */
3429
3430 static int
3431 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3432 uschar *interface, transport_instance *tblock,
3433 BOOL *message_defer, BOOL suppress_tls)
3434 {
3435 smtp_transport_options_block * ob = SOB tblock->options_block;
3436 int yield = OK;
3437 int save_errno;
3438 int rc;
3439 struct timeval start_delivery_time;
3440
3441 BOOL pass_message = FALSE;
3442 uschar *message = NULL;
3443 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3444
3445 smtp_context sx;
3446
3447 gettimeofday(&start_delivery_time, NULL);
3448 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3449 *message_defer = FALSE;
3450
3451 sx.addrlist = addrlist;
3452 sx.conn_args.host = host;
3453 sx.conn_args.host_af = host_af,
3454 sx.port = defport;
3455 sx.conn_args.interface = interface;
3456 sx.helo_data = NULL;
3457 sx.conn_args.tblock = tblock;
3458 sx.verify = FALSE;
3459 sx.sync_addr = sx.first_addr = addrlist;
3460
3461 /* Get the channel set up ready for a message (MAIL FROM being the next
3462 SMTP command to send */
3463
3464 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3465 return rc;
3466
3467 /* If there is a filter command specified for this transport, we can now
3468 set it up. This cannot be done until the identify of the host is known. */
3469
3470 if (tblock->filter_command)
3471 {
3472 transport_filter_timeout = tblock->filter_timeout;
3473
3474 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3475 yield ERROR. */
3476
3477 if (!transport_set_up_command(&transport_filter_argv,
3478 tblock->filter_command, TRUE, DEFER, addrlist,
3479 string_sprintf("%.50s transport", tblock->name), NULL))
3480 {
3481 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3482 FALSE);
3483 yield = ERROR;
3484 goto SEND_QUIT;
3485 }
3486
3487 if ( transport_filter_argv
3488 && *transport_filter_argv
3489 && **transport_filter_argv
3490 && sx.peer_offered & OPTION_CHUNKING
3491 )
3492 {
3493 sx.peer_offered &= ~OPTION_CHUNKING;
3494 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3495 }
3496 }
3497
3498 /* For messages that have more than the maximum number of envelope recipients,
3499 we want to send several transactions down the same SMTP connection. (See
3500 comments in deliver.c as to how this reconciles, heuristically, with
3501 remote_max_parallel.) This optimization was added to Exim after the following
3502 code was already working. The simplest way to put it in without disturbing the
3503 code was to use a goto to jump back to this point when there is another
3504 transaction to handle. */
3505
3506 SEND_MESSAGE:
3507 sx.from_addr = return_path;
3508 sx.sync_addr = sx.first_addr;
3509 sx.ok = FALSE;
3510 sx.send_rset = TRUE;
3511 sx.completed_addr = FALSE;
3512
3513
3514 /* If we are a continued-connection-after-verify the MAIL and RCPT
3515 commands were already sent; do not re-send but do mark the addrs as
3516 having been accepted up to RCPT stage. A traditional cont-conn
3517 always has a sequence number greater than one. */
3518
3519 if (continue_hostname && continue_sequence == 1)
3520 {
3521 sx.peer_offered = smtp_peer_options;
3522 sx.pending_MAIL = FALSE;
3523 sx.ok = TRUE;
3524 sx.next_addr = NULL;
3525
3526 for (address_item * addr = addrlist; addr; addr = addr->next)
3527 addr->transport_return = PENDING_OK;
3528 }
3529 else
3530 {
3531 /* Initiate a message transfer. */
3532
3533 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3534 {
3535 case 0: break;
3536 case -1: case -2: goto RESPONSE_FAILED;
3537 case -3: goto END_OFF;
3538 case -4: goto SEND_QUIT;
3539 default: goto SEND_FAILED;
3540 }
3541
3542 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3543 permanently or temporarily. We should have flushed and synced after the last
3544 RCPT. */
3545
3546 if (mua_wrapper)
3547 {
3548 address_item * a;
3549 unsigned cnt;
3550
3551 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3552 if (a->transport_return != PENDING_OK)
3553 {
3554 /*XXX could we find a better errno than 0 here? */
3555 set_errno_nohost(addrlist, 0, a->message, FAIL,
3556 testflag(a, af_pass_message));
3557 sx.ok = FALSE;
3558 break;
3559 }
3560 }
3561 }
3562
3563 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3564 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3565 have a good recipient buffered up if we are pipelining. We don't want to waste
3566 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3567 are pipelining. The responses are all handled by sync_responses().
3568 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3569 to send is. */
3570
3571 if ( !(sx.peer_offered & OPTION_CHUNKING)
3572 && (sx.ok || (pipelining_active && !mua_wrapper)))
3573 {
3574 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3575
3576 if (count < 0) goto SEND_FAILED;
3577 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3578 {
3579 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3580 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3581 break;
3582
3583 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3584 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3585 case 0: break; /* No 2xx or 5xx, but no probs */
3586
3587 case -1: goto END_OFF; /* Timeout on RCPT */
3588
3589 #ifdef EXPERIMENTAL_PIPE_CONNECT
3590 case -4: HDEBUG(D_transport)
3591 debug_printf("failed reaping pipelined cmd responses\n");
3592 #endif
3593 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3594 }
3595 pipelining_active = FALSE;
3596 data_command = string_copy(big_buffer); /* Save for later error message */
3597 }
3598
3599 /* If there were no good recipients (but otherwise there have been no
3600 problems), just set ok TRUE, since we have handled address-specific errors
3601 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3602 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3603 well as body. Set the appropriate timeout value to be used for each chunk.
3604 (Haven't been able to make it work using select() for writing yet.) */
3605
3606 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3607 {
3608 /* Save the first address of the next batch. */
3609 sx.first_addr = sx.next_addr;
3610
3611 sx.ok = TRUE;
3612 }
3613 else
3614 {
3615 transport_ctx tctx = {
3616 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3617 .tblock = tblock,
3618 .addr = addrlist,
3619 .check_string = US".",
3620 .escape_string = US"..", /* Escaping strings */
3621 .options =
3622 topt_use_crlf | topt_escape_headers
3623 | (tblock->body_only ? topt_no_headers : 0)
3624 | (tblock->headers_only ? topt_no_body : 0)
3625 | (tblock->return_path_add ? topt_add_return_path : 0)
3626 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3627 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3628 };
3629
3630 /* If using CHUNKING we need a callback from the generic transport
3631 support to us, for the sending of BDAT smtp commands and the reaping
3632 of responses. The callback needs a whole bunch of state so set up
3633 a transport-context structure to be passed around. */
3634
3635 if (sx.peer_offered & OPTION_CHUNKING)
3636 {
3637 tctx.check_string = tctx.escape_string = NULL;
3638 tctx.options |= topt_use_bdat;
3639 tctx.chunk_cb = smtp_chunk_cmd_callback;
3640 sx.pending_BDAT = FALSE;
3641 sx.good_RCPT = sx.ok;
3642 sx.cmd_count = 0;
3643 tctx.smtp_context = &sx;
3644 }
3645 else
3646 tctx.options |= topt_end_dot;
3647
3648 /* Save the first address of the next batch. */
3649 sx.first_addr = sx.next_addr;
3650
3651 /* Responses from CHUNKING commands go in buffer. Otherwise,
3652 there has not been a response. */
3653
3654 sx.buffer[0] = 0;
3655
3656 sigalrm_seen = FALSE;
3657 transport_write_timeout = ob->data_timeout;
3658 smtp_command = US"sending data block"; /* For error messages */
3659 DEBUG(D_transport|D_v)
3660 if (sx.peer_offered & OPTION_CHUNKING)
3661 debug_printf(" will write message using CHUNKING\n");
3662 else
3663 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3664 transport_count = 0;
3665
3666 #ifndef DISABLE_DKIM
3667 dkim_exim_sign_init();
3668 # ifdef EXPERIMENTAL_ARC
3669 {
3670 uschar * s = ob->arc_sign;
3671 if (s)
3672 {
3673 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3674 {
3675 if (!f.expand_string_forcedfail)
3676 {
3677 message = US"failed to expand arc_sign";
3678 sx.ok = FALSE;
3679 goto SEND_FAILED;
3680 }
3681 }
3682 else if (*s)
3683 {
3684 /* Ask dkim code to hash the body for ARC */
3685 (void) arc_ams_setup_sign_bodyhash();
3686 ob->dkim.force_bodyhash = TRUE;
3687 }
3688 }
3689 }
3690 # endif
3691 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3692 #else
3693 sx.ok = transport_write_message(&tctx, 0);
3694 #endif
3695
3696 /* transport_write_message() uses write() because it is called from other
3697 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3698 it can exit with "Broken pipe" as its error. This really means that the
3699 socket got closed at the far end. */
3700
3701 transport_write_timeout = 0; /* for subsequent transports */
3702
3703 /* Failure can either be some kind of I/O disaster (including timeout),
3704 or the failure of a transport filter or the expansion of added headers.
3705 Or, when CHUNKING, it can be a protocol-detected failure. */
3706
3707 if (!sx.ok)
3708 if (message) goto SEND_FAILED;
3709 else goto RESPONSE_FAILED;
3710
3711 /* We used to send the terminating "." explicitly here, but because of
3712 buffering effects at both ends of TCP/IP connections, you don't gain
3713 anything by keeping it separate, so it might as well go in the final
3714 data buffer for efficiency. This is now done by setting the topt_end_dot
3715 flag above. */
3716
3717 smtp_command = US"end of data";
3718
3719 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3720 {
3721 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3722 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3723 {
3724 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3725 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3726 break;
3727
3728 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3729 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3730 case 0: break; /* No 2xx or 5xx, but no probs */
3731
3732 case -1: goto END_OFF; /* Timeout on RCPT */
3733
3734 #ifdef EXPERIMENTAL_PIPE_CONNECT
3735 case -4: HDEBUG(D_transport)
3736 debug_printf("failed reaping pipelined cmd responses\n");
3737 #endif
3738 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3739 }
3740 }
3741
3742 #ifndef DISABLE_PRDR
3743 /* For PRDR we optionally get a partial-responses warning followed by the
3744 individual responses, before going on with the overall response. If we don't
3745 get the warning then deal with per non-PRDR. */
3746
3747 if(sx.prdr_active)
3748 {
3749 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3750 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3751 {
3752 case '2': sx.prdr_active = FALSE;
3753 sx.ok = TRUE;
3754 break;
3755 case '4': errno = ERRNO_DATA4XX;
3756 addrlist->more_errno |=
3757 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3758 break;
3759 }
3760 }
3761 else
3762 #endif
3763
3764 /* For non-PRDR SMTP, we now read a single response that applies to the
3765 whole message. If it is OK, then all the addresses have been delivered. */
3766
3767 if (!sx.lmtp)
3768 {
3769 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3770 ob->final_timeout);
3771 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3772 {
3773 errno = ERRNO_DATA4XX;
3774 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3775 }
3776 }
3777
3778 /* For LMTP, we get back a response for every RCPT command that we sent;
3779 some may be accepted and some rejected. For those that get a response, their
3780 status is fixed; any that are accepted have been handed over, even if later
3781 responses crash - at least, that's how I read RFC 2033.
3782
3783 If all went well, mark the recipient addresses as completed, record which
3784 host/IPaddress they were delivered to, and cut out RSET when sending another
3785 message down the same channel. Write the completed addresses to the journal
3786 now so that they are recorded in case there is a crash of hardware or
3787 software before the spool gets updated. Also record the final SMTP
3788 confirmation if needed (for SMTP only). */
3789
3790 if (sx.ok)
3791 {
3792 int flag = '=';
3793 struct timeval delivery_time;
3794 int len;
3795 uschar * conf = NULL;
3796
3797 timesince(&delivery_time, &start_delivery_time);
3798 sx.send_rset = FALSE;
3799 pipelining_active = FALSE;
3800
3801 /* Set up confirmation if needed - applies only to SMTP */
3802
3803 if (
3804 #ifdef DISABLE_EVENT
3805 LOGGING(smtp_confirmation) &&
3806 #endif
3807 !sx.lmtp
3808 )
3809 {
3810 const uschar *s = string_printing(sx.buffer);
3811 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3812 conf = (s == sx.buffer)? US string_copy(s) : US s;
3813 }
3814
3815 /* Process all transported addresses - for LMTP or PRDR, read a status for
3816 each one. */
3817
3818 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3819 {
3820 if (addr->transport_return != PENDING_OK) continue;
3821
3822 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3823 remaining addresses. Otherwise, it's a return code for just the one
3824 address. For temporary errors, add a retry item for the address so that
3825 it doesn't get tried again too soon. */
3826
3827 #ifndef DISABLE_PRDR
3828 if (sx.lmtp || sx.prdr_active)
3829 #else
3830 if (sx.lmtp)
3831 #endif
3832 {
3833 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3834 ob->final_timeout))
3835 {
3836 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3837 addr->message = string_sprintf(
3838 #ifndef DISABLE_PRDR
3839 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3840 #else
3841 "LMTP error after %s: %s",
3842 #endif
3843 data_command, string_printing(sx.buffer));
3844 setflag(addr, af_pass_message); /* Allow message to go to user */
3845 if (sx.buffer[0] == '5')
3846 addr->transport_return = FAIL;
3847 else
3848 {
3849 errno = ERRNO_DATA4XX;
3850 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3851 addr->transport_return = DEFER;
3852 #ifndef DISABLE_PRDR
3853 if (!sx.prdr_active)
3854 #endif
3855 retry_add_item(addr, addr->address_retry_key, 0);
3856 }
3857 continue;
3858 }
3859 sx.completed_addr = TRUE; /* NOW we can set this flag */
3860 if (LOGGING(smtp_confirmation))
3861 {
3862 const uschar *s = string_printing(sx.buffer);
3863 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3864 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3865 }
3866 }
3867
3868 /* SMTP, or success return from LMTP for this address. Pass back the
3869 actual host that was used. */
3870
3871 addr->transport_return = OK;
3872 addr->more_errno = delivery_time.tv_sec;
3873 addr->delivery_usec = delivery_time.tv_usec;
3874 addr->host_used = host;
3875 addr->special_action = flag;
3876 addr->message = conf;
3877
3878 if (tcp_out_fastopen)
3879 {
3880 setflag(addr, af_tcp_fastopen_conn);
3881 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3882 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3883 }
3884 if (sx.pipelining_used) setflag(addr, af_pipelining);
3885 #ifdef EXPERIMENTAL_PIPE_CONNECT
3886 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3887 #endif
3888 #ifndef DISABLE_PRDR
3889 if (sx.prdr_active) setflag(addr, af_prdr_used);
3890 #endif
3891 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3892 flag = '-';
3893
3894 #ifndef DISABLE_PRDR
3895 if (!sx.prdr_active)
3896 #endif
3897 {
3898 /* Update the journal. For homonymic addresses, use the base address plus
3899 the transport name. See lots of comments in deliver.c about the reasons
3900 for the complications when homonyms are involved. Just carry on after
3901 write error, as it may prove possible to update the spool file later. */
3902
3903 if (testflag(addr, af_homonym))
3904 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3905 else
3906 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3907
3908 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3909 len = Ustrlen(CS sx.buffer);
3910 if (write(journal_fd, sx.buffer, len) != len)
3911 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3912 "%s: %s", sx.buffer, strerror(errno));
3913 }
3914 }
3915
3916 #ifndef DISABLE_PRDR
3917 if (sx.prdr_active)
3918 {
3919 const uschar * overall_message;
3920
3921 /* PRDR - get the final, overall response. For any non-success
3922 upgrade all the address statuses. */
3923
3924 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3925 ob->final_timeout);
3926 if (!sx.ok)
3927 {
3928 if(errno == 0 && sx.buffer[0] == '4')
3929 {
3930 errno = ERRNO_DATA4XX;
3931 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3932 }
3933 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3934 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3935 addr->transport_return = PENDING_OK; /* allow set_errno action */
3936 goto RESPONSE_FAILED;
3937 }
3938
3939 /* Append the overall response to the individual PRDR response for logging
3940 and update the journal, or setup retry. */
3941
3942 overall_message = string_printing(sx.buffer);
3943 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3944 if (addr->transport_return == OK)
3945 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3946
3947 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3948 if (addr->transport_return == OK)
3949 {
3950 if (testflag(addr, af_homonym))
3951 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3952 else
3953 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3954
3955 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3956 len = Ustrlen(CS sx.buffer);
3957 if (write(journal_fd, sx.buffer, len) != len)
3958 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3959 "%s: %s", sx.buffer, strerror(errno));
3960 }
3961 else if (addr->transport_return == DEFER)
3962 retry_add_item(addr, addr->address_retry_key, -2);
3963 }
3964 #endif
3965
3966 /* Ensure the journal file is pushed out to disk. */
3967
3968 if (EXIMfsync(journal_fd) < 0)
3969 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3970 strerror(errno));
3971 }
3972 }
3973
3974
3975 /* Handle general (not specific to one address) failures here. The value of ok
3976 is used to skip over this code on the falling through case. A timeout causes a
3977 deferral. Other errors may defer or fail according to the response code, and
3978 may set up a special errno value, e.g. after connection chopped, which is
3979 assumed if errno == 0 and there is no text in the buffer. If control reaches
3980 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3981 the problem is not related to this specific message. */
3982
3983 if (!sx.ok)
3984 {
3985 int code, set_rc;
3986 uschar * set_message;
3987
3988 RESPONSE_FAILED:
3989 {
3990 save_errno = errno;
3991 message = NULL;
3992 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3993 sx.buffer, &code, &message, &pass_message);
3994 goto FAILED;
3995 }
3996
3997 SEND_FAILED:
3998 {
3999 save_errno = errno;
4000 code = '4';
4001 message = string_sprintf("send() to %s [%s] failed: %s",
4002 host->name, host->address, message ? message : US strerror(save_errno));
4003 sx.send_quit = FALSE;
4004 goto FAILED;
4005 }
4006
4007 FAILED:
4008 {
4009 BOOL message_error;
4010
4011 sx.ok = FALSE; /* For when reached by GOTO */
4012 set_message = message;
4013
4014 /* We want to handle timeouts after MAIL or "." and loss of connection after
4015 "." specially. They can indicate a problem with the sender address or with
4016 the contents of the message rather than a real error on the connection. These
4017 cases are treated in the same way as a 4xx response. This next bit of code
4018 does the classification. */
4019
4020 switch(save_errno)
4021 {
4022 case 0:
4023 case ERRNO_MAIL4XX:
4024 case ERRNO_DATA4XX:
4025 message_error = TRUE;
4026 break;
4027
4028 case ETIMEDOUT:
4029 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4030 Ustrncmp(smtp_command,"end ",4) == 0;
4031 break;
4032
4033 case ERRNO_SMTPCLOSED:
4034 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4035 break;
4036
4037 default:
4038 message_error = FALSE;
4039 break;
4040 }
4041
4042 /* Handle the cases that are treated as message errors. These are:
4043
4044 (a) negative response or timeout after MAIL
4045 (b) negative response after DATA
4046 (c) negative response or timeout or dropped connection after "."
4047 (d) utf8 support required and not offered
4048
4049 It won't be a negative response or timeout after RCPT, as that is dealt
4050 with separately above. The action in all cases is to set an appropriate
4051 error code for all the addresses, but to leave yield set to OK because the
4052 host itself has not failed. Of course, it might in practice have failed
4053 when we've had a timeout, but if so, we'll discover that at the next
4054 delivery attempt. For a temporary error, set the message_defer flag, and
4055 write to the logs for information if this is not the last host. The error
4056 for the last host will be logged as part of the address's log line. */
4057
4058 if (message_error)
4059 {
4060 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4061
4062 /* If there's an errno, the message contains just the identity of
4063 the host. */
4064
4065 if (code == '5')
4066 set_rc = FAIL;
4067 else /* Anything other than 5 is treated as temporary */
4068 {
4069 set_rc = DEFER;
4070 if (save_errno > 0)
4071 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4072
4073 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4074
4075 *message_defer = TRUE;
4076 }
4077 }
4078
4079 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4080 ".", or some other transportation error. We defer all addresses and yield
4081 DEFER, except for the case of failed add_headers expansion, or a transport
4082 filter failure, when the yield should be ERROR, to stop it trying other
4083 hosts. */
4084
4085 else
4086 {
4087 #ifdef EXPERIMENTAL_PIPE_CONNECT
4088 /* If we were early-pipelinng and the actual EHLO response did not match
4089 the cached value we assumed, we could have detected it and passed a
4090 custom errno through to here. It would be nice to RSET and retry right
4091 away, but to reliably do that we eould need an extra synch point before
4092 we committed to data and that would discard half the gained roundrips.
4093 Or we could summarily drop the TCP connection. but that is also ugly.
4094 Instead, we ignore the possibility (having freshened the cache) and rely
4095 on the server telling us with a nonmessage error if we have tried to
4096 do something it no longer supports. */
4097 #endif
4098 set_rc = DEFER;
4099 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4100 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4101 }
4102 }
4103
4104 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4105 #ifdef EXPERIMENTAL_DSN_INFO
4106 , sx.smtp_greeting, sx.helo_response
4107 #endif
4108 );
4109 }
4110
4111
4112 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4113 SMTP session tidily. However, if there were too many addresses to send in one
4114 message (indicated by first_addr being non-NULL) we want to carry on with the
4115 rest of them. Also, it is desirable to send more than one message down the SMTP
4116 connection if there are several waiting, provided we haven't already sent so
4117 many as to hit the configured limit. The function transport_check_waiting looks
4118 for a waiting message and returns its id. Then transport_pass_socket tries to
4119 set up a continued delivery by passing the socket on to another process. The
4120 variable send_rset is FALSE if a message has just been successfully transferred.
4121
4122 If we are already sending down a continued channel, there may be further
4123 addresses not yet delivered that are aimed at the same host, but which have not
4124 been passed in this run of the transport. In this case, continue_more will be
4125 true, and all we should do is send RSET if necessary, and return, leaving the
4126 channel open.
4127
4128 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4129 do not want to continue with other messages down the same channel, because that
4130 can lead to looping between two or more messages, all with the same,
4131 temporarily failing address(es). [The retry information isn't updated yet, so
4132 new processes keep on trying.] We probably also don't want to try more of this
4133 message's addresses either.
4134
4135 If we have started a TLS session, we have to end it before passing the
4136 connection to a new process. However, not all servers can handle this (Exim
4137 can), so we do not pass such a connection on if the host matches
4138 hosts_nopass_tls. */
4139
4140 DEBUG(D_transport)
4141 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4142 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4143 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4144
4145 if (sx.completed_addr && sx.ok && sx.send_quit)
4146 {
4147 BOOL more;
4148 smtp_compare_t t_compare;
4149
4150 t_compare.tblock = tblock;
4151 t_compare.current_sender_address = sender_address;
4152
4153 if ( sx.first_addr != NULL
4154 || f.continue_more
4155 || (
4156 #ifdef SUPPORT_TLS
4157 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4158 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4159 )
4160 &&
4161 #endif
4162 transport_check_waiting(tblock->name, host->name,
4163 tblock->connection_max_messages, new_message_id, &more,
4164 (oicf)smtp_are_same_identities, (void*)&t_compare)
4165 ) )
4166 {
4167 uschar *msg;
4168 BOOL pass_message;
4169
4170 if (sx.send_rset)
4171 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4172 {
4173 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4174 host->address, strerror(errno));
4175 sx.send_quit = FALSE;
4176 }
4177 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4178 '2', ob->command_timeout)))
4179 {
4180 int code;
4181 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4182 &pass_message);
4183 if (!sx.send_quit)
4184 {
4185 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4186 host->name, host->address, msg);
4187 }
4188 }
4189
4190 /* Either RSET was not needed, or it succeeded */
4191
4192 if (sx.ok)
4193 {
4194 #ifdef SUPPORT_TLS
4195 int pfd[2];
4196 #endif
4197 int socket_fd = sx.cctx.sock;
4198
4199
4200 if (sx.first_addr != NULL) /* More addresses still to be sent */
4201 { /* in this run of the transport */
4202 continue_sequence++; /* Causes * in logging */
4203 goto SEND_MESSAGE;
4204 }
4205
4206 /* Unless caller said it already has more messages listed for this host,
4207 pass the connection on to a new Exim process (below, the call to
4208 transport_pass_socket). If the caller has more ready, just return with
4209 the connection still open. */
4210
4211 #ifdef SUPPORT_TLS
4212 if (tls_out.active.sock >= 0)
4213 if ( f.continue_more
4214 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4215 {
4216 /* Before passing the socket on, or returning to caller with it still
4217 open, we must shut down TLS. Not all MTAs allow for the continuation
4218 of the SMTP session when TLS is shut down. We test for this by sending
4219 a new EHLO. If we don't get a good response, we don't attempt to pass
4220 the socket on. */
4221
4222 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4223 sx.cctx.tls_ctx = NULL;
4224 smtp_peer_options = smtp_peer_options_wrap;
4225 sx.ok = !sx.smtps
4226 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4227 >= 0
4228 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4229 '2', ob->command_timeout);
4230
4231 if (sx.ok && f.continue_more)
4232 return yield; /* More addresses for another run */
4233 }
4234 else
4235 {
4236 /* Set up a pipe for proxying TLS for the new transport process */
4237
4238 smtp_peer_options |= OPTION_TLS;
4239 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4240 socket_fd = pfd[1];
4241 else
4242 set_errno(sx.first_addr, errno, US"internal allocation problem",
4243 DEFER, FALSE, host
4244 # ifdef EXPERIMENTAL_DSN_INFO
4245 , sx.smtp_greeting, sx.helo_response
4246 # endif
4247 );
4248 }
4249 else
4250 #endif
4251 if (f.continue_more)
4252 return yield; /* More addresses for another run */
4253
4254 /* If the socket is successfully passed, we mustn't send QUIT (or
4255 indeed anything!) from here. */
4256
4257 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4258 propagate it from the initial
4259 */
4260 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4261 host->address, new_message_id, socket_fd))
4262 {
4263 sx.send_quit = FALSE;
4264
4265 /* We have passed the client socket to a fresh transport process.
4266 If TLS is still active, we need to proxy it for the transport we
4267 just passed the baton to. Fork a child to to do it, and return to
4268 get logging done asap. Which way to place the work makes assumptions
4269 about post-fork prioritisation which may not hold on all platforms. */
4270 #ifdef SUPPORT_TLS
4271 if (tls_out.active.sock >= 0)
4272 {
4273 int pid = fork();
4274 if (pid == 0) /* child; fork again to disconnect totally */
4275 {
4276 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4277 /* does not return */
4278 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4279 ob->command_timeout);
4280 }
4281
4282 if (pid > 0) /* parent */
4283 {
4284 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4285 close(pfd[0]);
4286 /* tidy the inter-proc to disconn the proxy proc */
4287 waitpid(pid, NULL, 0);
4288 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4289 sx.cctx.tls_ctx = NULL;
4290 (void)close(sx.cctx.sock);
4291 sx.cctx.sock = -1;
4292 continue_transport = NULL;
4293 continue_hostname = NULL;
4294 return yield;
4295 }
4296 log_write(0, LOG_PANIC_DIE, "fork failed");
4297 }
4298 #endif
4299 }
4300 }
4301
4302 /* If RSET failed and there are addresses left, they get deferred. */
4303 else
4304 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4305 #ifdef EXPERIMENTAL_DSN_INFO
4306 , sx.smtp_greeting, sx.helo_response
4307 #endif
4308 );
4309 }
4310 }
4311
4312 /* End off tidily with QUIT unless the connection has died or the socket has
4313 been passed to another process. There has been discussion on the net about what
4314 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4315 to wait for a response, but on the other hand, there isn't anything one can do
4316 with an error response, other than log it. Exim used to do that. However,
4317 further discussion suggested that it is positively advantageous not to wait for
4318 the response, but to close the session immediately. This is supposed to move
4319 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4320 load from the server. (Hosts that are both servers and clients may not see much
4321 difference, of course.) Further discussion indicated that this was safe to do
4322 on Unix systems which have decent implementations of TCP/IP that leave the
4323 connection around for a while (TIME_WAIT) after the application has gone away.
4324 This enables the response sent by the server to be properly ACKed rather than
4325 timed out, as can happen on broken TCP/IP implementations on other OS.
4326
4327 This change is being made on 31-Jul-98. After over a year of trouble-free
4328 operation, the old commented-out code was removed on 17-Sep-99. */
4329
4330 SEND_QUIT:
4331 #ifdef TCP_CORK
4332 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4333 #endif
4334 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4335
4336 END_OFF:
4337
4338 #ifdef SUPPORT_TLS
4339 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4340 sx.cctx.tls_ctx = NULL;
4341 #endif
4342
4343 /* Close the socket, and return the appropriate value, first setting
4344 works because the NULL setting is passed back to the calling process, and
4345 remote_max_parallel is forced to 1 when delivering over an existing connection,
4346
4347 If all went well and continue_more is set, we shouldn't actually get here if
4348 there are further addresses, as the return above will be taken. However,
4349 writing RSET might have failed, or there may be other addresses whose hosts are
4350 specified in the transports, and therefore not visible at top level, in which
4351 case continue_more won't get set. */
4352
4353 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4354 if (sx.send_quit)
4355 {
4356 shutdown(sx.cctx.sock, SHUT_WR);
4357 millisleep(f.running_in_test_harness ? 200 : 20);
4358 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4359 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4360 i--; /* drain socket */
4361 }
4362 (void)close(sx.cctx.sock);
4363
4364 #ifndef DISABLE_EVENT
4365 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4366 #endif
4367
4368 continue_transport = NULL;
4369 continue_hostname = NULL;
4370 return yield;
4371 }
4372
4373
4374
4375
4376 /*************************************************
4377 * Closedown entry point *
4378 *************************************************/
4379
4380 /* This function is called when exim is passed an open smtp channel
4381 from another incarnation, but the message which it has been asked
4382 to deliver no longer exists. The channel is on stdin.
4383
4384 We might do fancy things like looking for another message to send down
4385 the channel, but if the one we sought has gone, it has probably been
4386 delivered by some other process that itself will seek further messages,
4387 so just close down our connection.
4388
4389 Argument: pointer to the transport instance block
4390 Returns: nothing
4391 */
4392
4393 void
4394 smtp_transport_closedown(transport_instance *tblock)
4395 {
4396 smtp_transport_options_block * ob = SOB tblock->options_block;
4397 client_conn_ctx cctx;
4398 smtp_context sx;
4399 uschar buffer[256];
4400 uschar inbuffer[4096];
4401 uschar outbuffer[16];
4402
4403 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4404 cctx.sock = fileno(stdin);
4405 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4406
4407 sx.inblock.cctx = &cctx;
4408 sx.inblock.buffer = inbuffer;
4409 sx.inblock.buffersize = sizeof(inbuffer);
4410 sx.inblock.ptr = inbuffer;
4411 sx.inblock.ptrend = inbuffer;
4412
4413 sx.outblock.cctx = &cctx;
4414 sx.outblock.buffersize = sizeof(outbuffer);
4415 sx.outblock.buffer = outbuffer;
4416 sx.outblock.ptr = outbuffer;
4417 sx.outblock.cmd_count = 0;
4418 sx.outblock.authenticating = FALSE;
4419
4420 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4421 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4422 (void)close(cctx.sock);
4423 }
4424
4425
4426
4427 /*************************************************
4428 * Prepare addresses for delivery *
4429 *************************************************/
4430
4431 /* This function is called to flush out error settings from previous delivery
4432 attempts to other hosts. It also records whether we got here via an MX record
4433 or not in the more_errno field of the address. We are interested only in
4434 addresses that are still marked DEFER - others may have got delivered to a
4435 previously considered IP address. Set their status to PENDING_DEFER to indicate
4436 which ones are relevant this time.
4437
4438 Arguments:
4439 addrlist the list of addresses
4440 host the host we are delivering to
4441
4442 Returns: the first address for this delivery
4443 */
4444
4445 static address_item *
4446 prepare_addresses(address_item *addrlist, host_item *host)
4447 {
4448 address_item *first_addr = NULL;
4449 for (address_item * addr = addrlist; addr; addr = addr->next)
4450 if (addr->transport_return == DEFER)
4451 {
4452 if (!first_addr) first_addr = addr;
4453 addr->transport_return = PENDING_DEFER;
4454 addr->basic_errno = 0;
4455 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4456 addr->message = NULL;
4457 #ifdef SUPPORT_TLS
4458 addr->cipher = NULL;
4459 addr->ourcert = NULL;
4460 addr->peercert = NULL;
4461 addr->peerdn = NULL;
4462 addr->ocsp = OCSP_NOT_REQ;
4463 #endif
4464 #ifdef EXPERIMENTAL_DSN_INFO
4465 addr->smtp_greeting = NULL;
4466 addr->helo_response = NULL;
4467 #endif
4468 }
4469 return first_addr;
4470 }
4471
4472
4473
4474 /*************************************************
4475 * Main entry point *
4476 *************************************************/
4477
4478 /* See local README for interface details. As this is a remote transport, it is
4479 given a chain of addresses to be delivered in one connection, if possible. It
4480 always returns TRUE, indicating that each address has its own independent
4481 status set, except if there is a setting up problem, in which case it returns
4482 FALSE. */
4483
4484 BOOL
4485 smtp_transport_entry(
4486 transport_instance *tblock, /* data for this instantiation */
4487 address_item *addrlist) /* addresses we are working on */
4488 {
4489 int defport;
4490 int hosts_defer = 0;
4491 int hosts_fail = 0;
4492 int hosts_looked_up = 0;
4493 int hosts_retry = 0;
4494 int hosts_serial = 0;
4495 int hosts_total = 0;
4496 int total_hosts_tried = 0;
4497 BOOL expired = TRUE;
4498 uschar *expanded_hosts = NULL;
4499 uschar *pistring;
4500 uschar *tid = string_sprintf("%s transport", tblock->name);
4501 smtp_transport_options_block *ob = SOB tblock->options_block;
4502 host_item *hostlist = addrlist->host_list;
4503 host_item *host = NULL;
4504
4505 DEBUG(D_transport)
4506 {
4507 debug_printf("%s transport entered\n", tblock->name);
4508 for (address_item * addr = addrlist; addr; addr = addr->next)
4509 debug_printf(" %s\n", addr->address);
4510 if (hostlist)
4511 {
4512 debug_printf("hostlist:\n");
4513 for (host_item * host = hostlist; host; host = host->next)
4514 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4515 }
4516 if (continue_hostname)
4517 debug_printf("already connected to %s [%s] (on fd %d)\n",
4518 continue_hostname, continue_host_address,
4519 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4520 }
4521
4522 /* Set the flag requesting that these hosts be added to the waiting
4523 database if the delivery fails temporarily or if we are running with
4524 queue_smtp or a 2-stage queue run. This gets unset for certain
4525 kinds of error, typically those that are specific to the message. */
4526
4527 update_waiting = TRUE;
4528
4529 /* If a host list is not defined for the addresses - they must all have the
4530 same one in order to be passed to a single transport - or if the transport has
4531 a host list with hosts_override set, use the host list supplied with the
4532 transport. It is an error for this not to exist. */
4533
4534 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
4535 if (tls_requiretls & REQUIRETLS_MSG)
4536 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
4537 rather than modifying the transport? */
4538 #endif
4539
4540 if (!hostlist || (ob->hosts_override && ob->hosts))
4541 {
4542 if (!ob->hosts)
4543 {
4544 addrlist->message = string_sprintf("%s transport called with no hosts set",
4545 tblock->name);
4546 addrlist->transport_return = PANIC;
4547 return FALSE; /* Only top address has status */
4548 }
4549
4550 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4551 ob->hosts);
4552
4553 /* If the transport's host list contains no '$' characters, and we are not
4554 randomizing, it is fixed and therefore a chain of hosts can be built once
4555 and for all, and remembered for subsequent use by other calls to this
4556 transport. If, on the other hand, the host list does contain '$', or we are
4557 randomizing its order, we have to rebuild it each time. In the fixed case,
4558 as the hosts string will never be used again, it doesn't matter that we
4559 replace all the : characters with zeros. */
4560
4561 if (!ob->hostlist)
4562 {
4563 uschar *s = ob->hosts;
4564
4565 if (Ustrchr(s, '$') != NULL)
4566 {
4567 if (!(expanded_hosts = expand_string(s)))
4568 {
4569 addrlist->message = string_sprintf("failed to expand list of hosts "
4570 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4571 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4572 return FALSE; /* Only top address has status */
4573 }
4574 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4575 "\"%s\"\n", s, expanded_hosts);
4576 s = expanded_hosts;
4577 }
4578 else
4579 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4580
4581 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4582
4583 /* Check that the expansion yielded something useful. */
4584 if (!hostlist)
4585 {
4586 addrlist->message =
4587 string_sprintf("%s transport has empty hosts setting", tblock->name);
4588 addrlist->transport_return = PANIC;
4589 return FALSE; /* Only top address has status */
4590 }
4591
4592 /* If there was no expansion of hosts, save the host list for
4593 next time. */
4594
4595 if (!expanded_hosts) ob->hostlist = hostlist;
4596 }
4597
4598 /* This is not the first time this transport has been run in this delivery;
4599 the host list was built previously. */
4600
4601 else
4602 hostlist = ob->hostlist;
4603 }
4604
4605 /* The host list was supplied with the address. If hosts_randomize is set, we
4606 must sort it into a random order if it did not come from MX records and has not
4607 already been randomized (but don't bother if continuing down an existing
4608 connection). */
4609
4610 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4611 {
4612 host_item *newlist = NULL;
4613 while (hostlist)
4614 {
4615 host_item *h = hostlist;
4616 hostlist = hostlist->next;
4617
4618 h->sort_key = random_number(100);
4619
4620 if (!newlist)
4621 {
4622 h->next = NULL;
4623 newlist = h;
4624 }
4625 else if (h->sort_key < newlist->sort_key)
4626 {
4627 h->next = newlist;
4628 newlist = h;
4629 }
4630 else
4631 {
4632 host_item *hh = newlist;
4633 while (hh->next)
4634 {
4635 if (h->sort_key < hh->next->sort_key) break;
4636 hh = hh->next;
4637 }
4638 h->next = hh->next;
4639 hh->next = h;
4640 }
4641 }
4642
4643 hostlist = addrlist->host_list = newlist;
4644 }
4645
4646 /* Sort out the default port. */
4647
4648 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4649
4650 /* For each host-plus-IP-address on the list:
4651
4652 . If this is a continued delivery and the host isn't the one with the
4653 current connection, skip.
4654
4655 . If the status is unusable (i.e. previously failed or retry checked), skip.
4656
4657 . If no IP address set, get the address, either by turning the name into
4658 an address, calling gethostbyname if gethostbyname is on, or by calling
4659 the DNS. The DNS may yield multiple addresses, in which case insert the
4660 extra ones into the list.
4661
4662 . Get the retry data if not previously obtained for this address and set the
4663 field which remembers the state of this address. Skip if the retry time is
4664 not reached. If not, remember whether retry data was found. The retry string
4665 contains both the name and the IP address.
4666
4667 . Scan the list of addresses and mark those whose status is DEFER as
4668 PENDING_DEFER. These are the only ones that will be processed in this cycle
4669 of the hosts loop.
4670
4671 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4672 Some addresses may be successfully delivered, others may fail, and yet
4673 others may get temporary errors and so get marked DEFER.
4674
4675 . The return from the delivery attempt is OK if a connection was made and a
4676 valid SMTP dialogue was completed. Otherwise it is DEFER.
4677
4678 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4679
4680 . If fail to connect, or other defer state, add a retry item.
4681
4682 . If there are any addresses whose status is still DEFER, carry on to the
4683 next host/IPaddress, unless we have tried the number of hosts given
4684 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4685 there is some fancy logic for hosts_max_try that means its limit can be
4686 overstepped in some circumstances.
4687
4688 If we get to the end of the list, all hosts have deferred at least one address,
4689 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4690 delivery attempt to those hosts whose last try was before the arrival time of
4691 the current message. To cope with this, we have to go round the loop a second
4692 time. After that, set the status and error data for any addresses that haven't
4693 had it set already. */
4694
4695 for (int cutoff_retry = 0;
4696 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4697 cutoff_retry++)
4698 {
4699 host_item *nexthost = NULL;
4700 int unexpired_hosts_tried = 0;
4701 BOOL continue_host_tried = FALSE;
4702
4703 retry_non_continued:
4704 for (host = hostlist;
4705 host
4706 && unexpired_hosts_tried < ob->hosts_max_try
4707 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4708 host = nexthost)
4709 {
4710 int rc;
4711 int host_af;
4712 uschar *rs;
4713 BOOL host_is_expired = FALSE;
4714 BOOL message_defer = FALSE;
4715 BOOL some_deferred = FALSE;
4716 address_item *first_addr = NULL;
4717 uschar *interface = NULL;
4718 uschar *retry_host_key = NULL;
4719 uschar *retry_message_key = NULL;
4720 uschar *serialize_key = NULL;
4721
4722 /* Default next host is next host. :-) But this can vary if the
4723 hosts_max_try limit is hit (see below). It may also be reset if a host
4724 address is looked up here (in case the host was multihomed). */
4725
4726 nexthost = host->next;
4727
4728 /* If the address hasn't yet been obtained from the host name, look it up
4729 now, unless the host is already marked as unusable. If it is marked as
4730 unusable, it means that the router was unable to find its IP address (in
4731 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4732 the lookup failed last time. We don't get this far if *all* MX records
4733 point to non-existent hosts; that is treated as a hard error.
4734
4735 We can just skip this host entirely. When the hosts came from the router,
4736 the address will timeout based on the other host(s); when the address is
4737 looked up below, there is an explicit retry record added.
4738
4739 Note that we mustn't skip unusable hosts if the address is not unset; they
4740 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4741
4742 if (!host->address)
4743 {
4744 int new_port, flags;
4745
4746 if (host->status >= hstatus_unusable)
4747 {
4748 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4749 host->name);
4750 continue;
4751 }
4752
4753 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4754
4755 /* The host name is permitted to have an attached port. Find it, and
4756 strip it from the name. Just remember it for now. */
4757
4758 new_port = host_item_get_port(host);
4759
4760 /* Count hosts looked up */
4761
4762 hosts_looked_up++;
4763
4764 /* Find by name if so configured, or if it's an IP address. We don't
4765 just copy the IP address, because we need the test-for-local to happen. */
4766
4767 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4768 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4769 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4770
4771 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4772 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4773 else
4774 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4775 &ob->dnssec, /* domains for request/require */
4776 NULL, NULL);
4777
4778 /* Update the host (and any additional blocks, resulting from
4779 multihoming) with a host-specific port, if any. */
4780
4781 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4782
4783 /* Failure to find the host at this time (usually DNS temporary failure)
4784 is really a kind of routing failure rather than a transport failure.
4785 Therefore we add a retry item of the routing kind, not to stop us trying
4786 to look this name up here again, but to ensure the address gets timed
4787 out if the failures go on long enough. A complete failure at this point
4788 commonly points to a configuration error, but the best action is still
4789 to carry on for the next host. */
4790
4791 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4792 {
4793 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4794 expired = FALSE;
4795 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4796 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4797 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4798 host->status = hstatus_unusable;
4799
4800 for (address_item * addr = addrlist; addr; addr = addr->next)
4801 {
4802 if (addr->transport_return != DEFER) continue;
4803 addr->basic_errno = ERRNO_UNKNOWNHOST;
4804 addr->message = string_sprintf(
4805 rc == HOST_FIND_SECURITY
4806 ? "lookup of IP address for %s was insecure"
4807 : "failed to lookup IP address for %s",
4808 host->name);
4809 }
4810 continue;
4811 }
4812
4813 /* If the host is actually the local host, we may have a problem, or
4814 there may be some cunning configuration going on. In the problem case,
4815 log things and give up. The default transport status is already DEFER. */
4816
4817 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4818 {
4819 for (address_item * addr = addrlist; addr; addr = addr->next)
4820 {
4821 addr->basic_errno = 0;
4822 addr->message = string_sprintf("%s transport found host %s to be "
4823 "local", tblock->name, host->name);
4824 }
4825 goto END_TRANSPORT;
4826 }
4827 } /* End of block for IP address lookup */
4828
4829 /* If this is a continued delivery, we are interested only in the host
4830 which matches the name of the existing open channel. The check is put
4831 here after the local host lookup, in case the name gets expanded as a
4832 result of the lookup. Set expired FALSE, to save the outer loop executing
4833 twice. */
4834
4835 if (continue_hostname)
4836 if ( Ustrcmp(continue_hostname, host->name) != 0
4837 || Ustrcmp(continue_host_address, host->address) != 0
4838 )
4839 {
4840 expired = FALSE;
4841 continue; /* With next host */
4842 }
4843 else
4844 continue_host_tried = TRUE;
4845
4846 /* Reset the default next host in case a multihomed host whose addresses
4847 are not looked up till just above added to the host list. */
4848
4849 nexthost = host->next;
4850
4851 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4852 domain is in queue_smtp_domains, we don't actually want to attempt any
4853 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4854 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4855 were not in it. We don't want to hold up all SMTP deliveries! Except when
4856 doing a two-stage queue run, don't do this if forcing. */
4857
4858 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4859 match_isinlist(addrlist->domain,
4860 (const uschar **)&queue_smtp_domains, 0,
4861 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4862 {
4863 expired = FALSE;
4864 for (address_item * addr = addrlist; addr; addr = addr->next)
4865 if (addr->transport_return == DEFER)
4866 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4867 continue; /* With next host */
4868 }
4869
4870 /* Count hosts being considered - purely for an intelligent comment
4871 if none are usable. */
4872
4873 hosts_total++;
4874
4875 /* Set $host and $host address now in case they are needed for the
4876 interface expansion or the serialize_hosts check; they remain set if an
4877 actual delivery happens. */
4878
4879 deliver_host = host->name;
4880 deliver_host_address = host->address;
4881 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4882 : host->dnssec == DS_NO ? US"no"
4883 : US"";
4884
4885 /* Set up a string for adding to the retry key if the port number is not
4886 the standard SMTP port. A host may have its own port setting that overrides
4887 the default. */
4888
4889 pistring = string_sprintf(":%d", host->port == PORT_NONE
4890 ? defport : host->port);
4891 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4892
4893 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4894 string is set, even if constant (as different transports can have different
4895 constant settings), we must add it to the key that is used for retries,
4896 because connections to the same host from a different interface should be
4897 treated separately. */
4898
4899 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4900 if ((rs = ob->interface) && *rs)
4901 {
4902 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4903 return FALSE;
4904 pistring = string_sprintf("%s/%s", pistring, interface);
4905 }
4906
4907 /* The first time round the outer loop, check the status of the host by
4908 inspecting the retry data. The second time round, we are interested only
4909 in expired hosts that haven't been tried since this message arrived. */
4910
4911 if (cutoff_retry == 0)
4912 {
4913 BOOL incl_ip;
4914 /* Ensure the status of the address is set by checking retry data if
4915 necessary. There may be host-specific retry data (applicable to all
4916 messages) and also data for retries of a specific message at this host.
4917 If either of these retry records are actually read, the keys used are
4918 returned to save recomputing them later. */
4919
4920 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4921 US"retry_include_ip_address", ob->retry_include_ip_address,
4922 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4923 continue; /* with next host */
4924
4925 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4926 incl_ip, &retry_host_key, &retry_message_key);
4927
4928 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4929 host->address ? host->address : US"", pistring,
4930 host->status == hstatus_usable ? "usable"
4931 : host->status == hstatus_unusable ? "unusable"
4932 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4933
4934 /* Skip this address if not usable at this time, noting if it wasn't
4935 actually expired, both locally and in the address. */
4936
4937 switch (host->status)
4938 {
4939 case hstatus_unusable:
4940 expired = FALSE;
4941 setflag(addrlist, af_retry_skipped);
4942 /* Fall through */
4943
4944 case hstatus_unusable_expired:
4945 switch (host->why)
4946 {
4947 case hwhy_retry: hosts_retry++; break;
4948 case hwhy_failed: hosts_fail++; break;
4949 case hwhy_insecure:
4950 case hwhy_deferred: hosts_defer++; break;
4951 }
4952
4953 /* If there was a retry message key, implying that previously there
4954 was a message-specific defer, we don't want to update the list of
4955 messages waiting for these hosts. */
4956
4957 if (retry_message_key) update_waiting = FALSE;
4958 continue; /* With the next host or IP address */
4959 }
4960 }
4961
4962 /* Second time round the loop: if the address is set but expired, and
4963 the message is newer than the last try, let it through. */
4964
4965 else
4966 {
4967 if ( !host->address
4968 || host->status != hstatus_unusable_expired
4969 || host->last_try > received_time.tv_sec)
4970 continue;
4971 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4972 host->name, host->address, pistring);
4973 host_is_expired = TRUE;
4974 }
4975
4976 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4977 it remains TRUE only if all hosts are expired and none are actually tried.
4978 */
4979
4980 expired = FALSE;
4981
4982 /* If this host is listed as one to which access must be serialized,
4983 see if another Exim process has a connection to it, and if so, skip
4984 this host. If not, update the database to record our connection to it
4985 and remember this for later deletion. Do not do any of this if we are
4986 sending the message down a pre-existing connection. */
4987
4988 if ( !continue_hostname
4989 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4990 {
4991 serialize_key = string_sprintf("host-serialize-%s", host->name);
4992 if (!enq_start(serialize_key, 1))
4993 {
4994 DEBUG(D_transport)
4995 debug_printf("skipping host %s because another Exim process "
4996 "is connected to it\n", host->name);
4997 hosts_serial++;
4998 continue;
4999 }
5000 }
5001
5002 /* OK, we have an IP address that is not waiting for its retry time to
5003 arrive (it might be expired) OR (second time round the loop) we have an
5004 expired host that hasn't been tried since the message arrived. Have a go
5005 at delivering the message to it. First prepare the addresses by flushing
5006 out the result of previous attempts, and finding the first address that
5007 is still to be delivered. */
5008
5009 first_addr = prepare_addresses(addrlist, host);
5010
5011 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5012 message_id, host->name, host->address, addrlist->address,
5013 addrlist->next ? ", ..." : "");
5014
5015 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5016 message_id, host->name, host->address, pistring, addrlist->address,
5017 addrlist->next ? ", ..." : "");
5018
5019 /* This is not for real; don't do the delivery. If there are
5020 any remaining hosts, list them. */
5021
5022 if (f.dont_deliver)
5023 {
5024 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5025 for (address_item * addr = addrlist; addr; addr = addr->next)
5026 {
5027 addr->host_used = host;
5028 addr->special_action = '*';
5029 addr->message = US"delivery bypassed by -N option";
5030 }
5031 DEBUG(D_transport)
5032 {
5033 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5034 "*** host and remaining hosts:\n", tblock->name);
5035 for (host_item * host2 = host; host2; host2 = host2->next)
5036 debug_printf(" %s [%s]\n", host2->name,
5037 host2->address ? host2->address : US"unset");
5038 }
5039 rc = OK;
5040 }
5041
5042 /* This is for real. If the host is expired, we don't count it for
5043 hosts_max_retry. This ensures that all hosts must expire before an address
5044 is timed out, unless hosts_max_try_hardlimit (which protects against
5045 lunatic DNS configurations) is reached.
5046
5047 If the host is not expired and we are about to hit the hosts_max_retry
5048 limit, check to see if there is a subsequent hosts with a different MX
5049 value. If so, make that the next host, and don't count this one. This is a
5050 heuristic to make sure that different MXs do get tried. With a normal kind
5051 of retry rule, they would get tried anyway when the earlier hosts were
5052 delayed, but if the domain has a "retry every time" type of rule - as is
5053 often used for the the very large ISPs, that won't happen. */
5054
5055 else
5056 {
5057 host_item * thost;
5058 /* Make a copy of the host if it is local to this invocation
5059 of the transport. */
5060
5061 if (expanded_hosts)
5062 {
5063 thost = store_get(sizeof(host_item));
5064 *thost = *host;
5065 thost->name = string_copy(host->name);
5066 thost->address = string_copy(host->address);
5067 }
5068 else
5069 thost = host;
5070
5071 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5072 {
5073 DEBUG(D_transport)
5074 debug_printf("hosts_max_try limit reached with this host\n");
5075 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5076 {
5077 nexthost = h;
5078 unexpired_hosts_tried--;
5079 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5080 "and will be tried\n");
5081 break;
5082 }
5083 }
5084
5085 /* Attempt the delivery. */
5086
5087 total_hosts_tried++;
5088 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5089 &message_defer, FALSE);
5090
5091 /* Yield is one of:
5092 OK => connection made, each address contains its result;
5093 message_defer is set for message-specific defers (when all
5094 recipients are marked defer)
5095 DEFER => there was a non-message-specific delivery problem;
5096 ERROR => there was a problem setting up the arguments for a filter,
5097 or there was a problem with expanding added headers
5098 */
5099
5100 /* If the result is not OK, there was a non-message-specific problem.
5101 If the result is DEFER, we need to write to the logs saying what happened
5102 for this particular host, except in the case of authentication and TLS
5103 failures, where the log has already been written. If all hosts defer a
5104 general message is written at the end. */
5105
5106 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5107 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5108 write_logs(host, first_addr->message, first_addr->basic_errno);
5109
5110 #ifndef DISABLE_EVENT
5111 if (rc == DEFER)
5112 deferred_event_raise(first_addr, host);
5113 #endif
5114
5115 /* If STARTTLS was accepted, but there was a failure in setting up the
5116 TLS session (usually a certificate screwup), and the host is not in
5117 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5118 TLS forcibly turned off. We have to start from scratch with a new SMTP
5119 connection. That's why the retry is done from here, not from within
5120 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5121 session, so the in-clear transmission after those errors, if permitted,
5122 happens inside smtp_deliver().] */
5123
5124 #ifdef SUPPORT_TLS
5125 if ( rc == DEFER
5126 && first_addr->basic_errno == ERRNO_TLSFAILURE
5127 && ob->tls_tempfail_tryclear
5128 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5129 )
5130 {
5131 log_write(0, LOG_MAIN,
5132 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5133 first_addr->message, host->name, host->address);
5134 first_addr = prepare_addresses(addrlist, host);
5135 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5136 &message_defer, TRUE);
5137 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5138 write_logs(host, first_addr->message, first_addr->basic_errno);
5139 # ifndef DISABLE_EVENT
5140 if (rc == DEFER)
5141 deferred_event_raise(first_addr, host);
5142 # endif
5143 }
5144 #endif /*SUPPORT_TLS*/
5145 }
5146
5147 /* Delivery attempt finished */
5148
5149 rs = rc == OK ? US"OK"
5150 : rc == DEFER ? US"DEFER"
5151 : rc == ERROR ? US"ERROR"
5152 : US"?";
5153
5154 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5155 message_id, host->name, host->address, pistring, addrlist->address,
5156 addrlist->next ? " (& others)" : "", rs);
5157
5158 /* Release serialization if set up */
5159
5160 if (serialize_key) enq_end(serialize_key);
5161
5162 /* If the result is DEFER, or if a host retry record is known to exist, we
5163 need to add an item to the retry chain for updating the retry database
5164 at the end of delivery. We only need to add the item to the top address,
5165 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5166 for any other delivery attempts using the same address. (It is copied into
5167 the unusable tree at the outer level, so even if different address blocks
5168 contain the same address, it still won't get tried again.) */
5169
5170 if (rc == DEFER || retry_host_key)
5171 {
5172 int delete_flag = rc != DEFER ? rf_delete : 0;
5173 if (!retry_host_key)
5174 {
5175 BOOL incl_ip;
5176 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5177 US"retry_include_ip_address", ob->retry_include_ip_address,
5178 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5179 incl_ip = TRUE; /* error; use most-specific retry record */
5180
5181 retry_host_key = incl_ip
5182 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5183 : string_sprintf("T:%S%s", host->name, pistring);
5184 }
5185
5186 /* If a delivery of another message over an existing SMTP connection
5187 yields DEFER, we do NOT set up retry data for the host. This covers the
5188 case when there are delays in routing the addresses in the second message
5189 that are so long that the server times out. This is alleviated by not
5190 routing addresses that previously had routing defers when handling an
5191 existing connection, but even so, this case may occur (e.g. if a
5192 previously happily routed address starts giving routing defers). If the
5193 host is genuinely down, another non-continued message delivery will
5194 notice it soon enough. */
5195
5196 if (delete_flag != 0 || !continue_hostname)
5197 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5198
5199 /* We may have tried an expired host, if its retry time has come; ensure
5200 the status reflects the expiry for the benefit of any other addresses. */
5201
5202 if (rc == DEFER)
5203 {
5204 host->status = host_is_expired
5205 ? hstatus_unusable_expired : hstatus_unusable;
5206 host->why = hwhy_deferred;
5207 }
5208 }
5209
5210 /* If message_defer is set (host was OK, but every recipient got deferred
5211 because of some message-specific problem), or if that had happened
5212 previously so that a message retry key exists, add an appropriate item
5213 to the retry chain. Note that if there was a message defer but now there is
5214 a host defer, the message defer record gets deleted. That seems perfectly
5215 reasonable. Also, stop the message from being remembered as waiting
5216 for specific hosts. */
5217
5218 if (message_defer || retry_message_key)
5219 {
5220 int delete_flag = message_defer ? 0 : rf_delete;
5221 if (!retry_message_key)
5222 {
5223 BOOL incl_ip;
5224 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5225 US"retry_include_ip_address", ob->retry_include_ip_address,
5226 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5227 incl_ip = TRUE; /* error; use most-specific retry record */
5228
5229 retry_message_key = incl_ip
5230 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5231 message_id)
5232 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5233 }
5234 retry_add_item(addrlist, retry_message_key,
5235 rf_message | rf_host | delete_flag);
5236 update_waiting = FALSE;
5237 }
5238
5239 /* Any return other than DEFER (that is, OK or ERROR) means that the
5240 addresses have got their final statuses filled in for this host. In the OK
5241 case, see if any of them are deferred. */
5242
5243 if (rc == OK)
5244 for (address_item * addr = addrlist; addr; addr = addr->next)
5245 if (addr->transport_return == DEFER)
5246 {
5247 some_deferred = TRUE;
5248 break;
5249 }
5250
5251 /* If no addresses deferred or the result was ERROR, return. We do this for
5252 ERROR because a failing filter set-up or add_headers expansion is likely to
5253 fail for any host we try. */
5254
5255 if (rc == ERROR || (rc == OK && !some_deferred))
5256 {
5257 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5258 return TRUE; /* Each address has its status */
5259 }
5260
5261 /* If the result was DEFER or some individual addresses deferred, let
5262 the loop run to try other hosts with the deferred addresses, except for the
5263 case when we were trying to deliver down an existing channel and failed.
5264 Don't try any other hosts in this case. */
5265
5266 if (continue_hostname) break;
5267
5268 /* If the whole delivery, or some individual addresses, were deferred and
5269 there are more hosts that could be tried, do not count this host towards
5270 the hosts_max_try limit if the age of the message is greater than the
5271 maximum retry time for this host. This means we may try try all hosts,
5272 ignoring the limit, when messages have been around for some time. This is
5273 important because if we don't try all hosts, the address will never time
5274 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5275
5276 if ((rc == DEFER || some_deferred) && nexthost)
5277 {
5278 BOOL timedout;
5279 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5280
5281 if (retry && retry->rules)
5282 {
5283 retry_rule *last_rule;
5284 for (last_rule = retry->rules;
5285 last_rule->next;
5286 last_rule = last_rule->next);
5287 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5288 }
5289 else timedout = TRUE; /* No rule => timed out */
5290
5291 if (timedout)
5292 {
5293 unexpired_hosts_tried--;
5294 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5295 "hosts_max_try (message older than host's retry time)\n");
5296 }
5297 }
5298
5299 DEBUG(D_transport)
5300 {
5301 if (unexpired_hosts_tried >= ob->hosts_max_try)
5302 debug_printf("reached transport hosts_max_try limit %d\n",
5303 ob->hosts_max_try);
5304 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5305 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5306 ob->hosts_max_try_hardlimit);
5307 }
5308
5309 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5310 } /* End of loop for trying multiple hosts. */
5311
5312 /* If we failed to find a matching host in the list, for an already-open
5313 connection, just close it and start over with the list. This can happen
5314 for routing that changes from run to run, or big multi-IP sites with
5315 round-robin DNS. */
5316
5317 if (continue_hostname && !continue_host_tried)
5318 {
5319 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5320
5321 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5322 #ifdef SUPPORT_TLS
5323 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5324 transport */
5325 /*XXX doublecheck that! */
5326
5327 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5328 {
5329 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5330 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5331 cutthrough.cctx.tls_ctx = NULL;
5332 cutthrough.is_tls = FALSE;
5333 }
5334 else
5335 #else
5336 (void) write(fd, US"QUIT\r\n", 6);
5337 #endif
5338 (void) close(fd);
5339 cutthrough.cctx.sock = -1;
5340 continue_hostname = NULL;
5341 goto retry_non_continued;
5342 }
5343
5344 /* This is the end of the loop that repeats iff expired is TRUE and
5345 ob->delay_after_cutoff is FALSE. The second time round we will
5346 try those hosts that haven't been tried since the message arrived. */
5347
5348 DEBUG(D_transport)
5349 {
5350 debug_printf("all IP addresses skipped or deferred at least one address\n");
5351 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5352 debug_printf("retrying IP addresses not tried since message arrived\n");
5353 }
5354 }
5355
5356
5357 /* Get here if all IP addresses are skipped or defer at least one address. In
5358 MUA wrapper mode, this will happen only for connection or other non-message-
5359 specific failures. Force the delivery status for all addresses to FAIL. */
5360
5361 if (mua_wrapper)
5362 {
5363 for (address_item * addr = addrlist; addr; addr = addr->next)
5364 addr->transport_return = FAIL;
5365 goto END_TRANSPORT;
5366 }
5367
5368 /* In the normal, non-wrapper case, add a standard message to each deferred
5369 address if there hasn't been an error, that is, if it hasn't actually been
5370 tried this time. The variable "expired" will be FALSE if any deliveries were
5371 actually tried, or if there was at least one host that was not expired. That
5372 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5373 a delivery has been tried, an error code will be set, and the failing of the
5374 message is handled by the retry code later.
5375
5376 If queue_smtp is set, or this transport was called to send a subsequent message
5377 down an existing TCP/IP connection, and something caused the host not to be
5378 found, we end up here, but can detect these cases and handle them specially. */
5379
5380 for (address_item * addr = addrlist; addr; addr = addr->next)
5381 {
5382 /* If host is not NULL, it means that we stopped processing the host list
5383 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5384 means we need to behave as if some hosts were skipped because their retry
5385 time had not come. Specifically, this prevents the address from timing out.
5386 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5387 hosts were tried. */
5388
5389 if (host)
5390 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5391 {
5392 DEBUG(D_transport)
5393 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5394 "hosts were tried\n");
5395 }
5396 else
5397 {
5398 DEBUG(D_transport)
5399 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5400 setflag(addr, af_retry_skipped);
5401 }
5402
5403 if (f.queue_smtp) /* no deliveries attempted */
5404 {
5405 addr->transport_return = DEFER;
5406 addr->basic_errno = 0;
5407 addr->message = US"SMTP delivery explicitly queued";
5408 }
5409
5410 else if ( addr->transport_return == DEFER
5411 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5412 && !addr->message
5413 )
5414 {
5415 addr->basic_errno = ERRNO_HRETRY;
5416 if (continue_hostname)
5417 addr->message = US"no host found for existing SMTP connection";
5418 else if (expired)
5419 {
5420 setflag(addr, af_pass_message); /* This is not a security risk */
5421 addr->message = string_sprintf(
5422 "all hosts%s have been failing for a long time %s",
5423 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5424 ob->delay_after_cutoff
5425 ? US"(and retry time not reached)"
5426 : US"and were last tried after this message arrived");
5427
5428 /* If we are already using fallback hosts, or there are no fallback hosts
5429 defined, convert the result to FAIL to cause a bounce. */
5430
5431 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5432 addr->transport_return = FAIL;
5433 }
5434 else
5435 {
5436 const char * s;
5437 if (hosts_retry == hosts_total)
5438 s = "retry time not reached for any host%s";
5439 else if (hosts_fail == hosts_total)
5440 s = "all host address lookups%s failed permanently";
5441 else if (hosts_defer == hosts_total)
5442 s = "all host address lookups%s failed temporarily";
5443 else if (hosts_serial == hosts_total)
5444 s = "connection limit reached for all hosts%s";
5445 else if (hosts_fail+hosts_defer == hosts_total)
5446 s = "all host address lookups%s failed";
5447 else
5448 s = "some host address lookups failed and retry time "
5449 "not reached for other hosts or connection limit reached%s";
5450
5451 addr->message = string_sprintf(s,
5452 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5453 }
5454 }
5455 }
5456
5457 /* Update the database which keeps information about which messages are waiting
5458 for which hosts to become available. For some message-specific errors, the
5459 update_waiting flag is turned off because we don't want follow-on deliveries in
5460 those cases. If this transport instance is explicitly limited to one message
5461 per connection then follow-on deliveries are not possible and there's no need
5462 to create/update the per-transport wait-<transport_name> database. */
5463
5464 if (update_waiting && tblock->connection_max_messages != 1)
5465 transport_update_waiting(hostlist, tblock->name);
5466
5467 END_TRANSPORT:
5468
5469 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5470
5471 return TRUE; /* Each address has its status */
5472 }
5473
5474 #endif /*!MACRO_PREDEF*/
5475 /* vi: aw ai sw=2
5476 */
5477 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.