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