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I18N: add a utf8_downconvert option to the smtp transport. Bug 2248
[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 count--;
799 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
800 '2', ob->command_timeout))
801 {
802 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
803 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
804 if (errno == 0 && sx->buffer[0] != 0)
805 {
806 uschar flushbuffer[4096];
807 int save_errno = 0;
808 if (sx->buffer[0] == '4')
809 {
810 save_errno = ERRNO_MAIL4XX;
811 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
812 }
813 while (count-- > 0)
814 {
815 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
816 '2', ob->command_timeout)
817 && (errno != 0 || flushbuffer[0] == 0))
818 break;
819 }
820 errno = save_errno;
821 }
822
823 if (pending_DATA) count--; /* Number of RCPT responses to come */
824 while (count-- > 0) /* Mark any pending addrs with the host used */
825 {
826 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
827 addr->host_used = sx->host;
828 addr = addr->next;
829 }
830 return -3;
831 }
832 }
833
834 if (pending_DATA) count--; /* Number of RCPT responses to come */
835
836 /* Read and handle the required number of RCPT responses, matching each one up
837 with an address by scanning for the next address whose status is PENDING_DEFER.
838 */
839
840 while (count-- > 0)
841 {
842 while (addr->transport_return != PENDING_DEFER)
843 if (!(addr = addr->next))
844 return -2;
845
846 /* The address was accepted */
847 addr->host_used = sx->host;
848
849 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
850 '2', ob->command_timeout))
851 {
852 yield |= 1;
853 addr->transport_return = PENDING_OK;
854
855 /* If af_dr_retry_exists is set, there was a routing delay on this address;
856 ensure that any address-specific retry record is expunged. We do this both
857 for the basic key and for the version that also includes the sender. */
858
859 if (testflag(addr, af_dr_retry_exists))
860 {
861 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
862 sender_address);
863 retry_add_item(addr, altkey, rf_delete);
864 retry_add_item(addr, addr->address_retry_key, rf_delete);
865 }
866 }
867
868 /* Timeout while reading the response */
869
870 else if (errno == ETIMEDOUT)
871 {
872 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
873 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
874 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
875 retry_add_item(addr, addr->address_retry_key, 0);
876 update_waiting = FALSE;
877 return -1;
878 }
879
880 /* Handle other errors in obtaining an SMTP response by returning -1. This
881 will cause all the addresses to be deferred. Restore the SMTP command in
882 big_buffer for which we are checking the response, so the error message
883 makes sense. */
884
885 else if (errno != 0 || sx->buffer[0] == 0)
886 {
887 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
888 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
889 return -2;
890 }
891
892 /* Handle SMTP permanent and temporary response codes. */
893
894 else
895 {
896 addr->message =
897 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
898 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
899 string_printing(sx->buffer));
900 setflag(addr, af_pass_message);
901 if (!sx->verify)
902 msglog_line(sx->host, addr->message);
903
904 /* The response was 5xx */
905
906 if (sx->buffer[0] == '5')
907 {
908 addr->transport_return = FAIL;
909 yield |= 2;
910 }
911
912 /* The response was 4xx */
913
914 else
915 {
916 addr->transport_return = DEFER;
917 addr->basic_errno = ERRNO_RCPT4XX;
918 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
919
920 if (!sx->verify)
921 {
922 #ifndef DISABLE_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
925 #endif
926
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
929
930 if (sx->host->next)
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
932 sx->host->name, sx->host->address, addr->message);
933
934 #ifndef DISABLE_EVENT
935 else
936 msg_event_raise(US"msg:rcpt:defer", addr);
937 #endif
938
939 /* Do not put this message on the list of those waiting for specific
940 hosts, as otherwise it is likely to be tried too often. */
941
942 update_waiting = FALSE;
943
944 /* Add a retry item for the address so that it doesn't get tried again
945 too soon. If address_retry_include_sender is true, add the sender address
946 to the retry key. */
947
948 retry_add_item(addr,
949 ob->address_retry_include_sender
950 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
951 : addr->address_retry_key,
952 0);
953 }
954 }
955 }
956 } /* Loop for next RCPT response */
957
958 /* Update where to start at for the next block of responses, unless we
959 have already handled all the addresses. */
960
961 if (addr) sx->sync_addr = addr->next;
962
963 /* Handle a response to DATA. If we have not had any good recipients, either
964 previously or in this block, the response is ignored. */
965
966 if (pending_DATA != 0 &&
967 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
968 '3', ob->command_timeout))
969 {
970 int code;
971 uschar *msg;
972 BOOL pass_message;
973 if (pending_DATA > 0 || (yield & 1) != 0)
974 {
975 if (errno == 0 && sx->buffer[0] == '4')
976 {
977 errno = ERRNO_DATA4XX;
978 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
979 }
980 return -3;
981 }
982 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
983 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
984 "is in use and there were no good recipients\n", msg);
985 }
986
987 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
988 present) received 3xx. If any RCPTs were handled and yielded anything other
989 than 4xx, yield will be set non-zero. */
990
991 return yield;
992 }
993
994
995
996 /* Do the client side of smtp-level authentication */
997 /*
998 Arguments:
999 buffer EHLO response from server (gets overwritten)
1000 addrlist chain of potential addresses to deliver
1001 host host to deliver to
1002 ob transport options
1003 ibp, obp comms channel control blocks
1004
1005 Returns:
1006 OK Success, or failed (but not required): global "smtp_authenticated" set
1007 DEFER Failed authentication (and was required)
1008 ERROR Internal problem
1009
1010 FAIL_SEND Failed communications - transmit
1011 FAIL - response
1012 */
1013
1014 int
1015 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1016 smtp_transport_options_block *ob, BOOL is_esmtp,
1017 smtp_inblock *ibp, smtp_outblock *obp)
1018 {
1019 int require_auth;
1020 uschar *fail_reason = US"server did not advertise AUTH support";
1021
1022 smtp_authenticated = FALSE;
1023 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1024 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1025
1026 if (is_esmtp && !regex_AUTH) regex_AUTH =
1027 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1028 FALSE, TRUE);
1029
1030 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1031 {
1032 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1033 expand_nmax = -1; /* reset */
1034
1035 /* Must not do this check until after we have saved the result of the
1036 regex match above. */
1037
1038 if (require_auth == OK ||
1039 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1040 {
1041 auth_instance *au;
1042 fail_reason = US"no common mechanisms were found";
1043
1044 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1045
1046 /* Scan the configured authenticators looking for one which is configured
1047 for use as a client, which is not suppressed by client_condition, and
1048 whose name matches an authentication mechanism supported by the server.
1049 If one is found, attempt to authenticate by calling its client function.
1050 */
1051
1052 for (au = auths; !smtp_authenticated && au; au = au->next)
1053 {
1054 uschar *p = names;
1055 if (!au->client ||
1056 (au->client_condition != NULL &&
1057 !expand_check_condition(au->client_condition, au->name,
1058 US"client authenticator")))
1059 {
1060 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1061 au->name,
1062 (au->client)? "client_condition is false" :
1063 "not configured as a client");
1064 continue;
1065 }
1066
1067 /* Loop to scan supported server mechanisms */
1068
1069 while (*p)
1070 {
1071 int rc;
1072 int len = Ustrlen(au->public_name);
1073 while (isspace(*p)) p++;
1074
1075 if (strncmpic(au->public_name, p, len) != 0 ||
1076 (p[len] != 0 && !isspace(p[len])))
1077 {
1078 while (*p != 0 && !isspace(*p)) p++;
1079 continue;
1080 }
1081
1082 /* Found data for a listed mechanism. Call its client entry. Set
1083 a flag in the outblock so that data is overwritten after sending so
1084 that reflections don't show it. */
1085
1086 fail_reason = US"authentication attempt(s) failed";
1087 obp->authenticating = TRUE;
1088 rc = (au->info->clientcode)(au, ibp, obp,
1089 ob->command_timeout, buffer, bufsize);
1090 obp->authenticating = FALSE;
1091 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1092 au->name, rc);
1093
1094 /* A temporary authentication failure must hold up delivery to
1095 this host. After a permanent authentication failure, we carry on
1096 to try other authentication methods. If all fail hard, try to
1097 deliver the message unauthenticated unless require_auth was set. */
1098
1099 switch(rc)
1100 {
1101 case OK:
1102 smtp_authenticated = TRUE; /* stops the outer loop */
1103 client_authenticator = au->name;
1104 if (au->set_client_id != NULL)
1105 client_authenticated_id = expand_string(au->set_client_id);
1106 break;
1107
1108 /* Failure after writing a command */
1109
1110 case FAIL_SEND:
1111 return FAIL_SEND;
1112
1113 /* Failure after reading a response */
1114
1115 case FAIL:
1116 if (errno != 0 || buffer[0] != '5') return FAIL;
1117 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1118 au->name, host->name, host->address, buffer);
1119 break;
1120
1121 /* Failure by some other means. In effect, the authenticator
1122 decided it wasn't prepared to handle this case. Typically this
1123 is the result of "fail" in an expansion string. Do we need to
1124 log anything here? Feb 2006: a message is now put in the buffer
1125 if logging is required. */
1126
1127 case CANCELLED:
1128 if (*buffer != 0)
1129 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1130 "authentication H=%s [%s] %s", au->name, host->name,
1131 host->address, buffer);
1132 break;
1133
1134 /* Internal problem, message in buffer. */
1135
1136 case ERROR:
1137 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1138 DEFER, FALSE);
1139 return ERROR;
1140 }
1141
1142 break; /* If not authenticated, try next authenticator */
1143 } /* Loop for scanning supported server mechanisms */
1144 } /* Loop for further authenticators */
1145 }
1146 }
1147
1148 /* If we haven't authenticated, but are required to, give up. */
1149
1150 if (require_auth == OK && !smtp_authenticated)
1151 {
1152 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1153 string_sprintf("authentication required but %s", fail_reason), DEFER,
1154 FALSE);
1155 return DEFER;
1156 }
1157
1158 return OK;
1159 }
1160
1161
1162 /* Construct AUTH appendix string for MAIL TO */
1163 /*
1164 Arguments
1165 buffer to build string
1166 addrlist chain of potential addresses to deliver
1167 ob transport options
1168
1169 Globals smtp_authenticated
1170 client_authenticated_sender
1171 Return True on error, otherwise buffer has (possibly empty) terminated string
1172 */
1173
1174 BOOL
1175 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1176 smtp_transport_options_block *ob)
1177 {
1178 uschar *local_authenticated_sender = authenticated_sender;
1179
1180 #ifdef notdef
1181 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1182 #endif
1183
1184 if (ob->authenticated_sender != NULL)
1185 {
1186 uschar *new = expand_string(ob->authenticated_sender);
1187 if (new == NULL)
1188 {
1189 if (!expand_string_forcedfail)
1190 {
1191 uschar *message = string_sprintf("failed to expand "
1192 "authenticated_sender: %s", expand_string_message);
1193 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1194 return TRUE;
1195 }
1196 }
1197 else if (new[0] != 0) local_authenticated_sender = new;
1198 }
1199
1200 /* Add the authenticated sender address if present */
1201
1202 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1203 local_authenticated_sender != NULL)
1204 {
1205 string_format(buffer, bufsize, " AUTH=%s",
1206 auth_xtextencode(local_authenticated_sender,
1207 Ustrlen(local_authenticated_sender)));
1208 client_authenticated_sender = string_copy(local_authenticated_sender);
1209 }
1210 else
1211 *buffer= 0;
1212
1213 return FALSE;
1214 }
1215
1216
1217
1218 #ifdef SUPPORT_DANE
1219 /* Lookup TLSA record for host/port.
1220 Return: OK success with dnssec; DANE mode
1221 DEFER Do not use this host now, may retry later
1222 FAIL_FORCED No TLSA record; DANE not usable
1223 FAIL Do not use this connection
1224 */
1225
1226 int
1227 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1228 {
1229 /* move this out to host.c given the similarity to dns_lookup() ? */
1230 uschar buffer[300];
1231 const uschar * fullname = buffer;
1232 int rc;
1233 BOOL sec;
1234
1235 /* TLSA lookup string */
1236 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1237
1238 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1239 sec = dns_is_secure(dnsa);
1240 DEBUG(D_transport)
1241 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1242
1243 switch (rc)
1244 {
1245 case DNS_AGAIN:
1246 return DEFER; /* just defer this TLS'd conn */
1247
1248 case DNS_SUCCEED:
1249 if (sec) return OK;
1250 log_write(0, LOG_MAIN,
1251 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1252 /*FALLTRHOUGH*/
1253
1254 case DNS_NODATA: /* no TLSA RR for this lookup */
1255 case DNS_NOMATCH: /* no records at all for this lookup */
1256 return dane_required ? FAIL : FAIL_FORCED;
1257
1258 default:
1259 case DNS_FAIL:
1260 return dane_required ? FAIL : DEFER;
1261 }
1262 }
1263 #endif
1264
1265
1266
1267 typedef struct smtp_compare_s
1268 {
1269 uschar *current_sender_address;
1270 struct transport_instance *tblock;
1271 } smtp_compare_t;
1272
1273
1274 /* Create a unique string that identifies this message, it is based on
1275 sender_address, helo_data and tls_certificate if enabled.
1276 */
1277
1278 static uschar *
1279 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1280 {
1281 address_item * addr1;
1282 uschar * if1 = US"";
1283 uschar * helo1 = US"";
1284 #ifdef SUPPORT_TLS
1285 uschar * tlsc1 = US"";
1286 #endif
1287 uschar * save_sender_address = sender_address;
1288 uschar * local_identity = NULL;
1289 smtp_transport_options_block * ob =
1290 (smtp_transport_options_block *)tblock->options_block;
1291
1292 sender_address = sender;
1293
1294 addr1 = deliver_make_addr (sender, TRUE);
1295 deliver_set_expansions(addr1);
1296
1297 if (ob->interface)
1298 if1 = expand_string(ob->interface);
1299
1300 if (ob->helo_data)
1301 helo1 = expand_string(ob->helo_data);
1302
1303 #ifdef SUPPORT_TLS
1304 if (ob->tls_certificate)
1305 tlsc1 = expand_string(ob->tls_certificate);
1306 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1307 #else
1308 local_identity = string_sprintf ("%s^%s", if1, helo1);
1309 #endif
1310
1311 deliver_set_expansions(NULL);
1312 sender_address = save_sender_address;
1313
1314 return local_identity;
1315 }
1316
1317
1318
1319 /* This routine is a callback that is called from transport_check_waiting.
1320 This function will evaluate the incoming message versus the previous
1321 message. If the incoming message is using a different local identity then
1322 we will veto this new message. */
1323
1324 static BOOL
1325 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1326 {
1327 uschar * message_local_identity,
1328 * current_local_identity,
1329 * new_sender_address;
1330
1331 current_local_identity =
1332 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1333
1334 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1335 return 0;
1336
1337 message_local_identity =
1338 smtp_local_identity(new_sender_address, s_compare->tblock);
1339
1340 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1341 }
1342
1343
1344
1345 static unsigned
1346 ehlo_response(uschar * buf, unsigned checks)
1347 {
1348 size_t bsize = Ustrlen(buf);
1349
1350 #ifdef SUPPORT_TLS
1351 if ( checks & OPTION_TLS
1352 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_TLS;
1354
1355 # ifdef EXPERIMENTAL_REQUIRETLS
1356 if ( checks & OPTION_REQUIRETLS
1357 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1358 checks &= ~OPTION_REQUIRETLS;
1359 # endif
1360 #endif
1361
1362 if ( checks & OPTION_IGNQ
1363 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1364 PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~OPTION_IGNQ;
1366
1367 if ( checks & OPTION_CHUNKING
1368 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1369 checks &= ~OPTION_CHUNKING;
1370
1371 #ifndef DISABLE_PRDR
1372 if ( checks & OPTION_PRDR
1373 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1374 checks &= ~OPTION_PRDR;
1375 #endif
1376
1377 #ifdef SUPPORT_I18N
1378 if ( checks & OPTION_UTF8
1379 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1380 checks &= ~OPTION_UTF8;
1381 #endif
1382
1383 if ( checks & OPTION_DSN
1384 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1385 checks &= ~OPTION_DSN;
1386
1387 if ( checks & OPTION_PIPE
1388 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1389 PCRE_EOPT, NULL, 0) < 0)
1390 checks &= ~OPTION_PIPE;
1391
1392 if ( checks & OPTION_SIZE
1393 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1394 checks &= ~OPTION_SIZE;
1395
1396 return checks;
1397 }
1398
1399
1400
1401 /* Callback for emitting a BDAT data chunk header.
1402
1403 If given a nonzero size, first flush any buffered SMTP commands
1404 then emit the command.
1405
1406 Reap previous SMTP command responses if requested, and always reap
1407 the response from a previous BDAT command.
1408
1409 Args:
1410 tctx transport context
1411 chunk_size value for SMTP BDAT command
1412 flags
1413 tc_chunk_last add LAST option to SMTP BDAT command
1414 tc_reap_prev reap response to previous SMTP commands
1415
1416 Returns: OK or ERROR
1417 */
1418
1419 static int
1420 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1421 unsigned flags)
1422 {
1423 smtp_transport_options_block * ob =
1424 (smtp_transport_options_block *)(tctx->tblock->options_block);
1425 smtp_context * sx = tctx->smtp_context;
1426 int cmd_count = 0;
1427 int prev_cmd_count;
1428
1429 /* Write SMTP chunk header command. If not reaping responses, note that
1430 there may be more writes (like, the chunk data) done soon. */
1431
1432 if (chunk_size > 0)
1433 {
1434 if((cmd_count = smtp_write_command(&sx->outblock,
1435 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1436 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1437 ) < 0) return ERROR;
1438 if (flags & tc_chunk_last)
1439 data_command = string_copy(big_buffer); /* Save for later error message */
1440 }
1441
1442 prev_cmd_count = cmd_count += sx->cmd_count;
1443
1444 /* Reap responses for any previous, but not one we just emitted */
1445
1446 if (chunk_size > 0)
1447 prev_cmd_count--;
1448 if (sx->pending_BDAT)
1449 prev_cmd_count--;
1450
1451 if (flags & tc_reap_prev && prev_cmd_count > 0)
1452 {
1453 DEBUG(D_transport) debug_printf("look for %d responses"
1454 " for previous pipelined cmds\n", prev_cmd_count);
1455
1456 switch(sync_responses(sx, prev_cmd_count, 0))
1457 {
1458 case 1: /* 2xx (only) => OK */
1459 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1460 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1461 case 0: break; /* No 2xx or 5xx, but no probs */
1462
1463 case -1: /* Timeout on RCPT */
1464 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1465 }
1466 cmd_count = 1;
1467 if (!sx->pending_BDAT)
1468 pipelining_active = FALSE;
1469 }
1470
1471 /* Reap response for an outstanding BDAT */
1472
1473 if (sx->pending_BDAT)
1474 {
1475 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1476
1477 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1478 ob->command_timeout))
1479 {
1480 if (errno == 0 && sx->buffer[0] == '4')
1481 {
1482 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1483 sx->addrlist->more_errno |=
1484 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1485 }
1486 return ERROR;
1487 }
1488 cmd_count--;
1489 sx->pending_BDAT = FALSE;
1490 pipelining_active = FALSE;
1491 }
1492 else if (chunk_size > 0)
1493 sx->pending_BDAT = TRUE;
1494
1495
1496 sx->cmd_count = cmd_count;
1497 return OK;
1498 }
1499
1500
1501
1502 /*************************************************
1503 * Make connection for given message *
1504 *************************************************/
1505
1506 /*
1507 Arguments:
1508 ctx connection context
1509 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1510 a second attempt after TLS initialization fails
1511
1512 Returns: OK - the connection was made and the delivery attempted;
1513 fd is set in the conn context, tls_out set up.
1514 DEFER - the connection could not be made, or something failed
1515 while setting up the SMTP session, or there was a
1516 non-message-specific error, such as a timeout.
1517 ERROR - helo_data or add_headers or authenticated_sender is
1518 specified for this transport, and the string failed
1519 to expand
1520 */
1521 int
1522 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1523 {
1524 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1525 dns_answer tlsa_dnsa;
1526 #endif
1527 BOOL pass_message = FALSE;
1528 uschar * message = NULL;
1529 int yield = OK;
1530 int rc;
1531
1532 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1533
1534 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1535 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1536 sx->ok = FALSE;
1537 sx->send_rset = TRUE;
1538 sx->send_quit = TRUE;
1539 sx->setting_up = TRUE;
1540 sx->esmtp = TRUE;
1541 sx->esmtp_sent = FALSE;
1542 #ifdef SUPPORT_I18N
1543 sx->utf8_needed = FALSE;
1544 #endif
1545 sx->dsn_all_lasthop = TRUE;
1546 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1547 sx->dane = FALSE;
1548 sx->dane_required =
1549 verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1550 #endif
1551
1552 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1553 sx->peer_offered = 0;
1554 sx->avoid_option = 0;
1555 sx->igquotstr = US"";
1556 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1557 #ifdef EXPERIMENTAL_DSN_INFO
1558 sx->smtp_greeting = NULL;
1559 sx->helo_response = NULL;
1560 #endif
1561
1562 smtp_command = US"initial connection";
1563 sx->buffer[0] = '\0';
1564
1565 /* Set up the buffer for reading SMTP response packets. */
1566
1567 sx->inblock.buffer = sx->inbuffer;
1568 sx->inblock.buffersize = sizeof(sx->inbuffer);
1569 sx->inblock.ptr = sx->inbuffer;
1570 sx->inblock.ptrend = sx->inbuffer;
1571
1572 /* Set up the buffer for holding SMTP commands while pipelining */
1573
1574 sx->outblock.buffer = sx->outbuffer;
1575 sx->outblock.buffersize = sizeof(sx->outbuffer);
1576 sx->outblock.ptr = sx->outbuffer;
1577 sx->outblock.cmd_count = 0;
1578 sx->outblock.authenticating = FALSE;
1579
1580 /* Reset the parameters of a TLS session. */
1581
1582 tls_out.bits = 0;
1583 tls_out.cipher = NULL; /* the one we may use for this transport */
1584 tls_out.ourcert = NULL;
1585 tls_out.peercert = NULL;
1586 tls_out.peerdn = NULL;
1587 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1588 tls_out.sni = NULL;
1589 #endif
1590 tls_out.ocsp = OCSP_NOT_REQ;
1591
1592 /* Flip the legacy TLS-related variables over to the outbound set in case
1593 they're used in the context of the transport. Don't bother resetting
1594 afterward (when being used by a transport) as we're in a subprocess.
1595 For verify, unflipped once the callout is dealt with */
1596
1597 tls_modify_variables(&tls_out);
1598
1599 #ifndef SUPPORT_TLS
1600 if (sx->smtps)
1601 {
1602 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1603 DEFER, FALSE);
1604 return ERROR;
1605 }
1606 #endif
1607
1608 /* Make a connection to the host if this isn't a continued delivery, and handle
1609 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1610 specially so they can be identified for retries. */
1611
1612 if (!continue_hostname)
1613 {
1614 if (sx->verify)
1615 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1616
1617 /* Get the actual port the connection will use, into sx->host */
1618
1619 smtp_port_for_connect(sx->host, sx->port);
1620
1621 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1622 /* Do TLSA lookup for DANE */
1623 {
1624 tls_out.dane_verified = FALSE;
1625 tls_out.tlsa_usage = 0;
1626
1627 if (sx->host->dnssec == DS_YES)
1628 {
1629 if( sx->dane_required
1630 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1631 )
1632 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1633 {
1634 case OK: sx->dane = TRUE;
1635 sx->ob->tls_tempfail_tryclear = FALSE;
1636 break;
1637 case FAIL_FORCED: break;
1638 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1639 string_sprintf("DANE error: tlsa lookup %s",
1640 rc == DEFER ? "DEFER" : "FAIL"),
1641 rc, FALSE);
1642 # ifndef DISABLE_EVENT
1643 (void) event_raise(sx->tblock->event_action,
1644 US"dane:fail", sx->dane_required
1645 ? US"dane-required" : US"dnssec-invalid");
1646 # endif
1647 return rc;
1648 }
1649 }
1650 else if (sx->dane_required)
1651 {
1652 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1653 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1654 FAIL, FALSE);
1655 # ifndef DISABLE_EVENT
1656 (void) event_raise(sx->tblock->event_action,
1657 US"dane:fail", US"dane-required");
1658 # endif
1659 return FAIL;
1660 }
1661 }
1662 #endif /*DANE*/
1663
1664 /* Make the TCP connection */
1665
1666 sx->cctx.sock =
1667 smtp_connect(sx->host, sx->host_af, sx->interface,
1668 sx->ob->connect_timeout, sx->tblock);
1669 sx->cctx.tls_ctx = NULL;
1670 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1671
1672 if (sx->cctx.sock < 0)
1673 {
1674 uschar * msg = NULL;
1675 if (sx->verify)
1676 {
1677 msg = US strerror(errno);
1678 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1679 }
1680 set_errno_nohost(sx->addrlist,
1681 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1682 sx->verify ? string_sprintf("could not connect: %s", msg)
1683 : NULL,
1684 DEFER, FALSE);
1685 sx->send_quit = FALSE;
1686 return DEFER;
1687 }
1688
1689 /* Expand the greeting message while waiting for the initial response. (Makes
1690 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1691 delayed till here so that $sending_interface and $sending_port are set. */
1692
1693 if (sx->helo_data)
1694 if (!(sx->helo_data = expand_string(sx->helo_data)))
1695 if (sx->verify)
1696 log_write(0, LOG_MAIN|LOG_PANIC,
1697 "<%s>: failed to expand transport's helo_data value for callout: %s",
1698 sx->addrlist->address, expand_string_message);
1699
1700 #ifdef SUPPORT_I18N
1701 if (sx->helo_data)
1702 {
1703 expand_string_message = NULL;
1704 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1705 &expand_string_message)),
1706 expand_string_message)
1707 if (sx->verify)
1708 log_write(0, LOG_MAIN|LOG_PANIC,
1709 "<%s>: failed to expand transport's helo_data value for callout: %s",
1710 sx->addrlist->address, expand_string_message);
1711 else
1712 sx->helo_data = NULL;
1713 }
1714 #endif
1715
1716 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1717 is nevertheless a reasonably clean way of programming this kind of logic,
1718 where you want to escape on any error. */
1719
1720 if (!sx->smtps)
1721 {
1722 BOOL good_response;
1723
1724 #ifdef TCP_QUICKACK
1725 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1726 #endif
1727 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1728 '2', sx->ob->command_timeout);
1729 #ifdef EXPERIMENTAL_DSN_INFO
1730 sx->smtp_greeting = string_copy(sx->buffer);
1731 #endif
1732 if (!good_response) goto RESPONSE_FAILED;
1733
1734 #ifndef DISABLE_EVENT
1735 {
1736 uschar * s;
1737 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1738 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1739 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1740 if (s)
1741 {
1742 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1743 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1744 DEFER, FALSE);
1745 yield = DEFER;
1746 goto SEND_QUIT;
1747 }
1748 }
1749 #endif
1750
1751 /* Now check if the helo_data expansion went well, and sign off cleanly if
1752 it didn't. */
1753
1754 if (!sx->helo_data)
1755 {
1756 message = string_sprintf("failed to expand helo_data: %s",
1757 expand_string_message);
1758 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1759 yield = DEFER;
1760 goto SEND_QUIT;
1761 }
1762 }
1763
1764 /** Debugging without sending a message
1765 sx->addrlist->transport_return = DEFER;
1766 goto SEND_QUIT;
1767 **/
1768
1769 /* Errors that occur after this point follow an SMTP command, which is
1770 left in big_buffer by smtp_write_command() for use in error messages. */
1771
1772 smtp_command = big_buffer;
1773
1774 /* Tell the remote who we are...
1775
1776 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1777 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1778 greeting is of this form. The assumption was that the far end supports it
1779 properly... but experience shows that there are some that give 5xx responses,
1780 even though the banner includes "ESMTP" (there's a bloody-minded one that
1781 says "ESMTP not spoken here"). Cope with that case.
1782
1783 September 2000: Time has passed, and it seems reasonable now to always send
1784 EHLO at the start. It is also convenient to make the change while installing
1785 the TLS stuff.
1786
1787 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1788 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1789 would be no way to send out the mails, so there is now a host list
1790 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1791 PIPELINING problem as well. Maybe it can also be useful to cure other
1792 problems with broken servers.
1793
1794 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1795 Then somebody tried it with a Microsoft mailer... It seems that all other
1796 mailers use upper case for some reason (the RFC is quite clear about case
1797 independence) so, for peace of mind, I gave in. */
1798
1799 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1800
1801 /* Alas; be careful, since this goto is not an error-out, so conceivably
1802 we might set data between here and the target which we assume to exist
1803 and be usable. I can see this coming back to bite us. */
1804 #ifdef SUPPORT_TLS
1805 if (sx->smtps)
1806 {
1807 smtp_peer_options |= OPTION_TLS;
1808 suppress_tls = FALSE;
1809 sx->ob->tls_tempfail_tryclear = FALSE;
1810 smtp_command = US"SSL-on-connect";
1811 goto TLS_NEGOTIATE;
1812 }
1813 #endif
1814
1815 if (sx->esmtp)
1816 {
1817 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1818 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1819 goto SEND_FAILED;
1820 sx->esmtp_sent = TRUE;
1821 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1822 sx->ob->command_timeout))
1823 {
1824 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1825 {
1826 #ifdef EXPERIMENTAL_DSN_INFO
1827 sx->helo_response = string_copy(sx->buffer);
1828 #endif
1829 goto RESPONSE_FAILED;
1830 }
1831 sx->esmtp = FALSE;
1832 }
1833 #ifdef EXPERIMENTAL_DSN_INFO
1834 sx->helo_response = string_copy(sx->buffer);
1835 #endif
1836 }
1837 else
1838 DEBUG(D_transport)
1839 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1840
1841 if (!sx->esmtp)
1842 {
1843 BOOL good_response;
1844 int n = sizeof(sx->buffer);
1845 uschar * rsp = sx->buffer;
1846
1847 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1848 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1849
1850 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1851 goto SEND_FAILED;
1852 good_response = smtp_read_response(&sx->inblock, rsp, n,
1853 '2', sx->ob->command_timeout);
1854 #ifdef EXPERIMENTAL_DSN_INFO
1855 sx->helo_response = string_copy(rsp);
1856 #endif
1857 if (!good_response)
1858 {
1859 /* Handle special logging for a closed connection after HELO
1860 when had previously sent EHLO */
1861
1862 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1863 {
1864 errno = ERRNO_SMTPCLOSED;
1865 goto EHLOHELO_FAILED;
1866 }
1867 memmove(sx->buffer, rsp, Ustrlen(rsp));
1868 goto RESPONSE_FAILED;
1869 }
1870 }
1871
1872 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1873
1874 if (sx->esmtp || sx->lmtp)
1875 {
1876 sx->peer_offered = ehlo_response(sx->buffer,
1877 OPTION_TLS /* others checked later */
1878 );
1879
1880 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1881
1882 #ifdef SUPPORT_TLS
1883 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1884 #endif
1885 }
1886 }
1887
1888 /* For continuing deliveries down the same channel, having re-exec'd the socket
1889 is the standard input; for a socket held open from verify it is recorded
1890 in the cutthrough context block. Either way we don't need to redo EHLO here
1891 (but may need to do so for TLS - see below).
1892 Set up the pointer to where subsequent commands will be left, for
1893 error messages. Note that smtp_peer_options will have been
1894 set from the command line if they were set in the process that passed the
1895 connection on. */
1896
1897 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1898 as the continue goes via transport_pass_socket() and doublefork and exec.
1899 It does not wait. Unclear how we keep separate host's responses
1900 separate - we could match up by host ip+port as a bodge. */
1901
1902 else
1903 {
1904 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
1905 {
1906 sx->cctx = cutthrough.cctx;
1907 sx->host->port = sx->port = cutthrough.host.port;
1908 }
1909 else
1910 {
1911 sx->cctx.sock = 0; /* stdin */
1912 sx->cctx.tls_ctx = NULL;
1913 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1914 }
1915 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1916 smtp_command = big_buffer;
1917 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1918
1919 /* For a continued connection with TLS being proxied for us, or a
1920 held-open verify connection with TLS, nothing more to do. */
1921
1922 if ( continue_proxy_cipher
1923 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
1924 && cutthrough.is_tls)
1925 )
1926 {
1927 sx->peer_offered = smtp_peer_options;
1928 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1929 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1930 continue_proxy_cipher ? "proxied" : "verify conn with");
1931 return OK;
1932 }
1933 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1934 }
1935
1936 /* If TLS is available on this connection, whether continued or not, attempt to
1937 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1938 send another EHLO - the server may give a different answer in secure mode. We
1939 use a separate buffer for reading the response to STARTTLS so that if it is
1940 negative, the original EHLO data is available for subsequent analysis, should
1941 the client not be required to use TLS. If the response is bad, copy the buffer
1942 for error analysis. */
1943
1944 #ifdef SUPPORT_TLS
1945 if ( smtp_peer_options & OPTION_TLS
1946 && !suppress_tls
1947 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1948 && ( !sx->verify
1949 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1950 ) )
1951 {
1952 uschar buffer2[4096];
1953 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1954 goto SEND_FAILED;
1955
1956 /* If there is an I/O error, transmission of this message is deferred. If
1957 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1958 false, we also defer. However, if there is a temporary rejection of STARTTLS
1959 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1960 STARTTLS, we carry on. This means we will try to send the message in clear,
1961 unless the host is in hosts_require_tls (tested below). */
1962
1963 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1964 sx->ob->command_timeout))
1965 {
1966 if ( errno != 0
1967 || buffer2[0] == 0
1968 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1969 )
1970 {
1971 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1972 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1973 goto RESPONSE_FAILED;
1974 }
1975 }
1976
1977 /* STARTTLS accepted: try to negotiate a TLS session. */
1978
1979 else
1980 TLS_NEGOTIATE:
1981 {
1982 address_item * addr;
1983 uschar * errstr;
1984 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->host,
1985 sx->addrlist, sx->tblock,
1986 # ifdef SUPPORT_DANE
1987 sx->dane ? &tlsa_dnsa : NULL,
1988 # endif
1989 &tls_out, &errstr);
1990
1991 if (!sx->cctx.tls_ctx)
1992 {
1993 /* TLS negotiation failed; give an error. From outside, this function may
1994 be called again to try in clear on a new connection, if the options permit
1995 it for this host. */
1996
1997 # ifdef SUPPORT_DANE
1998 if (sx->dane)
1999 {
2000 log_write(0, LOG_MAIN,
2001 "DANE attempt failed; TLS connection to %s [%s]: %s",
2002 sx->host->name, sx->host->address, errstr);
2003 # ifndef DISABLE_EVENT
2004 (void) event_raise(sx->tblock->event_action,
2005 US"dane:fail", US"validation-failure"); /* could do with better detail */
2006 # endif
2007 }
2008 # endif
2009
2010 errno = ERRNO_TLSFAILURE;
2011 message = string_sprintf("TLS session: %s", errstr);
2012 sx->send_quit = FALSE;
2013 goto TLS_FAILED;
2014 }
2015
2016 /* TLS session is set up */
2017
2018 smtp_peer_options_wrap = smtp_peer_options;
2019 for (addr = sx->addrlist; addr; addr = addr->next)
2020 if (addr->transport_return == PENDING_DEFER)
2021 {
2022 addr->cipher = tls_out.cipher;
2023 addr->ourcert = tls_out.ourcert;
2024 addr->peercert = tls_out.peercert;
2025 addr->peerdn = tls_out.peerdn;
2026 addr->ocsp = tls_out.ocsp;
2027 }
2028 }
2029 }
2030
2031 /* if smtps, we'll have smtp_command set to something else; always safe to
2032 reset it here. */
2033 smtp_command = big_buffer;
2034
2035 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2036 helo_data is null, we are dealing with a connection that was passed from
2037 another process, and so we won't have expanded helo_data above. We have to
2038 expand it here. $sending_ip_address and $sending_port are set up right at the
2039 start of the Exim process (in exim.c). */
2040
2041 if (tls_out.active.sock >= 0)
2042 {
2043 char *greeting_cmd;
2044 BOOL good_response;
2045
2046 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2047 {
2048 uschar *message = string_sprintf("failed to expand helo_data: %s",
2049 expand_string_message);
2050 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2051 yield = DEFER;
2052 goto SEND_QUIT;
2053 }
2054
2055 /* For SMTPS we need to wait for the initial OK response. */
2056 if (sx->smtps)
2057 {
2058 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2059 '2', sx->ob->command_timeout);
2060 #ifdef EXPERIMENTAL_DSN_INFO
2061 sx->smtp_greeting = string_copy(sx->buffer);
2062 #endif
2063 if (!good_response) goto RESPONSE_FAILED;
2064 }
2065
2066 if (sx->esmtp)
2067 greeting_cmd = "EHLO";
2068 else
2069 {
2070 greeting_cmd = "HELO";
2071 DEBUG(D_transport)
2072 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2073 }
2074
2075 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2076 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2077 goto SEND_FAILED;
2078 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2079 '2', sx->ob->command_timeout);
2080 #ifdef EXPERIMENTAL_DSN_INFO
2081 sx->helo_response = string_copy(sx->buffer);
2082 #endif
2083 if (!good_response) goto RESPONSE_FAILED;
2084 smtp_peer_options = 0;
2085 }
2086
2087 /* If the host is required to use a secure channel, ensure that we
2088 have one. */
2089
2090 else if ( sx->smtps
2091 # ifdef SUPPORT_DANE
2092 || sx->dane
2093 # endif
2094 # ifdef EXPERIMENTAL_REQUIRETLS
2095 || tls_requiretls & REQUIRETLS_MSG
2096 # endif
2097 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2098 )
2099 {
2100 errno =
2101 # ifdef EXPERIMENTAL_REQUIRETLS
2102 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2103 # endif
2104 ERRNO_TLSREQUIRED;
2105 message = string_sprintf("a TLS session is required, but %s",
2106 smtp_peer_options & OPTION_TLS
2107 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2108 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2109 if (sx->dane)
2110 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2111 smtp_peer_options & OPTION_TLS
2112 ? US"validation-failure" /* could do with better detail */
2113 : US"starttls-not-supported");
2114 # endif
2115 goto TLS_FAILED;
2116 }
2117 #endif /*SUPPORT_TLS*/
2118
2119 /* If TLS is active, we have just started it up and re-done the EHLO command,
2120 so its response needs to be analyzed. If TLS is not active and this is a
2121 continued session down a previously-used socket, we haven't just done EHLO, so
2122 we skip this. */
2123
2124 if (continue_hostname == NULL
2125 #ifdef SUPPORT_TLS
2126 || tls_out.active.sock >= 0
2127 #endif
2128 )
2129 {
2130 if (sx->esmtp || sx->lmtp)
2131 {
2132 sx->peer_offered = ehlo_response(sx->buffer,
2133 0 /* no TLS */
2134 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2135 | OPTION_CHUNKING
2136 | OPTION_PRDR
2137 #ifdef SUPPORT_I18N
2138 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2139 /*XXX if we hand peercaps on to continued-conn processes,
2140 must not depend on this addr */
2141 #endif
2142 | OPTION_DSN
2143 | OPTION_PIPE
2144 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2145 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2146 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2147 #endif
2148 );
2149
2150 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2151 lmtp_ignore_quota option was set. */
2152
2153 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2154
2155 /* If the response to EHLO specified support for the SIZE parameter, note
2156 this, provided size_addition is non-negative. */
2157
2158 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2159
2160 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2161 the current host, esmtp will be false, so PIPELINING can never be used. If
2162 the current host matches hosts_avoid_pipelining, don't do it. */
2163
2164 if ( sx->peer_offered & OPTION_PIPE
2165 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2166 smtp_peer_options |= OPTION_PIPE;
2167
2168 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2169 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2170
2171 if ( sx->peer_offered & OPTION_CHUNKING
2172 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2173 sx->peer_offered &= ~OPTION_CHUNKING;
2174
2175 if (sx->peer_offered & OPTION_CHUNKING)
2176 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2177
2178 #ifndef DISABLE_PRDR
2179 if ( sx->peer_offered & OPTION_PRDR
2180 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2181 sx->peer_offered &= ~OPTION_PRDR;
2182
2183 if (sx->peer_offered & OPTION_PRDR)
2184 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2185 #endif
2186
2187 /* Note if the server supports DSN */
2188 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2189 DEBUG(D_transport) debug_printf("%susing DSN\n",
2190 sx->peer_offered & OPTION_DSN ? "" : "not ");
2191
2192 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2193 if (sx->peer_offered & OPTION_REQUIRETLS)
2194 {
2195 smtp_peer_options |= OPTION_REQUIRETLS;
2196 DEBUG(D_transport) debug_printf(
2197 tls_requiretls & REQUIRETLS_MSG
2198 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2199 }
2200 #endif
2201
2202 /* Note if the response to EHLO specifies support for the AUTH extension.
2203 If it has, check that this host is one we want to authenticate to, and do
2204 the business. The host name and address must be available when the
2205 authenticator's client driver is running. */
2206
2207 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2208 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2209 {
2210 default: goto SEND_QUIT;
2211 case OK: break;
2212 case FAIL_SEND: goto SEND_FAILED;
2213 case FAIL: goto RESPONSE_FAILED;
2214 }
2215 }
2216 }
2217 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2218
2219 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2220 message-specific. */
2221
2222 sx->setting_up = FALSE;
2223
2224 #ifdef SUPPORT_I18N
2225 if (sx->addrlist->prop.utf8_msg)
2226 {
2227 uschar * s;
2228
2229 /* If the transport sets a downconversion mode it overrides any set by ACL
2230 for the message. */
2231
2232 if ((s = sx->ob->utf8_downconvert))
2233 {
2234 if (!(s = expand_string(s)))
2235 {
2236 message = string_sprintf("failed to expand utf8_downconvert: %s",
2237 expand_string_message);
2238 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2239 yield = DEFER;
2240 goto SEND_QUIT;
2241 }
2242 switch (*s)
2243 {
2244 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2245 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2246 break;
2247 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2248 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2249 break;
2250 case '-': if (s[1] == '1')
2251 {
2252 sx->addrlist->prop.utf8_downcvt = FALSE;
2253 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2254 }
2255 break;
2256 }
2257 }
2258
2259 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2260 && !sx->addrlist->prop.utf8_downcvt_maybe;
2261 DEBUG(D_transport) if (!sx->utf8_needed)
2262 debug_printf("utf8: %s downconvert\n",
2263 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2264 }
2265
2266 /* If this is an international message we need the host to speak SMTPUTF8 */
2267 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2268 {
2269 errno = ERRNO_UTF8_FWD;
2270 goto RESPONSE_FAILED;
2271 }
2272 #endif /*SUPPORT_I18N*/
2273
2274 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2275 /*XXX should tls_requiretls actually be per-addr? */
2276
2277 if ( tls_requiretls & REQUIRETLS_MSG
2278 && !(sx->peer_offered & OPTION_REQUIRETLS)
2279 )
2280 {
2281 sx->setting_up = TRUE;
2282 errno = ERRNO_REQUIRETLS;
2283 message = US"REQUIRETLS support is required from the server"
2284 " but it was not offered";
2285 DEBUG(D_transport) debug_printf("%s\n", message);
2286 goto TLS_FAILED;
2287 }
2288 #endif
2289
2290 return OK;
2291
2292
2293 {
2294 int code;
2295
2296 RESPONSE_FAILED:
2297 message = NULL;
2298 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2299 sx->buffer, &code, &message, &pass_message);
2300 yield = DEFER;
2301 goto FAILED;
2302
2303 SEND_FAILED:
2304 code = '4';
2305 message = US string_sprintf("send() to %s [%s] failed: %s",
2306 sx->host->name, sx->host->address, strerror(errno));
2307 sx->send_quit = FALSE;
2308 yield = DEFER;
2309 goto FAILED;
2310
2311 EHLOHELO_FAILED:
2312 code = '4';
2313 message = string_sprintf("Remote host closed connection in response to %s"
2314 " (EHLO response was: %s)", smtp_command, sx->buffer);
2315 sx->send_quit = FALSE;
2316 yield = DEFER;
2317 goto FAILED;
2318
2319 /* This label is jumped to directly when a TLS negotiation has failed,
2320 or was not done for a host for which it is required. Values will be set
2321 in message and errno, and setting_up will always be true. Treat as
2322 a temporary error. */
2323
2324 #ifdef SUPPORT_TLS
2325 TLS_FAILED:
2326 # ifdef EXPERIMENTAL_REQUIRETLS
2327 if (errno == ERRNO_REQUIRETLS)
2328 code = '5', yield = FAIL;
2329 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2330 else
2331 # endif
2332 code = '4', yield = DEFER;
2333 goto FAILED;
2334 #endif
2335
2336 /* The failure happened while setting up the call; see if the failure was
2337 a 5xx response (this will either be on connection, or following HELO - a 5xx
2338 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2339 fail all addresses, as this host is never going to accept them. For other
2340 errors during setting up (timeouts or whatever), defer all addresses, and
2341 yield DEFER, so that the host is not tried again for a while.
2342
2343 XXX This peeking for another host feels like a layering violation. We want
2344 to note the host as unusable, but down here we shouldn't know if this was
2345 the last host to try for the addr(list). Perhaps the upper layer should be
2346 the one to do set_errno() ? The problem is that currently the addr is where
2347 errno etc. are stashed, but until we run out of hosts to try the errors are
2348 host-specific. Maybe we should enhance the host_item definition? */
2349
2350 FAILED:
2351 sx->ok = FALSE; /* For when reached by GOTO */
2352 set_errno(sx->addrlist, errno, message,
2353 sx->host->next
2354 ? DEFER
2355 : code == '5'
2356 #ifdef SUPPORT_I18N
2357 || errno == ERRNO_UTF8_FWD
2358 #endif
2359 ? FAIL : DEFER,
2360 pass_message, sx->host
2361 #ifdef EXPERIMENTAL_DSN_INFO
2362 , sx->smtp_greeting, sx->helo_response
2363 #endif
2364 );
2365 }
2366
2367
2368 SEND_QUIT:
2369
2370 if (sx->send_quit)
2371 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2372
2373 #ifdef SUPPORT_TLS
2374 if (sx->cctx.tls_ctx)
2375 {
2376 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2377 sx->cctx.tls_ctx = NULL;
2378 }
2379 #endif
2380
2381 /* Close the socket, and return the appropriate value, first setting
2382 works because the NULL setting is passed back to the calling process, and
2383 remote_max_parallel is forced to 1 when delivering over an existing connection,
2384 */
2385
2386 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2387 if (sx->send_quit)
2388 {
2389 shutdown(sx->cctx.sock, SHUT_WR);
2390 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2391 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2392 rc--; /* drain socket */
2393 sx->send_quit = FALSE;
2394 }
2395 (void)close(sx->cctx.sock);
2396 sx->cctx.sock = -1;
2397
2398 #ifndef DISABLE_EVENT
2399 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2400 #endif
2401
2402 continue_transport = NULL;
2403 continue_hostname = NULL;
2404 return yield;
2405 }
2406
2407
2408
2409
2410 /* Create the string of options that will be appended to the MAIL FROM:
2411 in the connection context buffer */
2412
2413 static int
2414 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2415 {
2416 uschar * p = sx->buffer;
2417 address_item * addr;
2418 int address_count;
2419
2420 *p = 0;
2421
2422 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2423 send it, adding something to the message size to allow for imprecision
2424 and things that get added en route. Exim keeps the number of lines
2425 in a message, so we can give an accurate value for the original message, but we
2426 need some additional to handle added headers. (Double "." characters don't get
2427 included in the count.) */
2428
2429 if ( message_size > 0
2430 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2431 {
2432 /*XXX problem here under spool_files_wireformat?
2433 Or just forget about lines? Or inflate by a fixed proportion? */
2434
2435 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2436 while (*p) p++;
2437 }
2438
2439 #ifndef DISABLE_PRDR
2440 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2441 request that */
2442
2443 sx->prdr_active = FALSE;
2444 if (sx->peer_offered & OPTION_PRDR)
2445 for (addr = addrlist; addr; addr = addr->next)
2446 if (addr->transport_return == PENDING_DEFER)
2447 {
2448 for (addr = addr->next; addr; addr = addr->next)
2449 if (addr->transport_return == PENDING_DEFER)
2450 { /* at least two recipients to send */
2451 sx->prdr_active = TRUE;
2452 sprintf(CS p, " PRDR"); p += 5;
2453 break;
2454 }
2455 break;
2456 }
2457 #endif
2458
2459 #ifdef SUPPORT_I18N
2460 /* If it supports internationalised messages, and this meesage need that,
2461 request it */
2462
2463 if ( sx->peer_offered & OPTION_UTF8
2464 && addrlist->prop.utf8_msg
2465 && !addrlist->prop.utf8_downcvt
2466 )
2467 Ustrcpy(p, " SMTPUTF8"), p += 9;
2468 #endif
2469
2470 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2471 if (tls_requiretls & REQUIRETLS_MSG)
2472 Ustrcpy(p, " REQUIRETLS") , p += 11;
2473 #endif
2474
2475 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2476 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2477 addr && address_count < sx->max_rcpt;
2478 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2479 {
2480 address_count++;
2481 if (!(addr->dsn_flags & rf_dsnlasthop))
2482 {
2483 sx->dsn_all_lasthop = FALSE;
2484 break;
2485 }
2486 }
2487
2488 /* Add any DSN flags to the mail command */
2489
2490 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2491 {
2492 if (dsn_ret == dsn_ret_hdrs)
2493 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2494 else if (dsn_ret == dsn_ret_full)
2495 { Ustrcpy(p, " RET=FULL"); p += 9; }
2496
2497 if (dsn_envid)
2498 {
2499 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2500 while (*p) p++;
2501 }
2502 }
2503
2504 /* If an authenticated_sender override has been specified for this transport
2505 instance, expand it. If the expansion is forced to fail, and there was already
2506 an authenticated_sender for this message, the original value will be used.
2507 Other expansion failures are serious. An empty result is ignored, but there is
2508 otherwise no check - this feature is expected to be used with LMTP and other
2509 cases where non-standard addresses (e.g. without domains) might be required. */
2510
2511 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2512 return ERROR;
2513
2514 return OK;
2515 }
2516
2517
2518 static void
2519 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2520 {
2521 uschar * p = sx->buffer;
2522 *p = 0;
2523
2524 /* Add any DSN flags to the rcpt command */
2525
2526 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2527 {
2528 if (addr->dsn_flags & rf_dsnflags)
2529 {
2530 int i;
2531 BOOL first = TRUE;
2532
2533 Ustrcpy(p, " NOTIFY=");
2534 while (*p) p++;
2535 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2536 {
2537 if (!first) *p++ = ',';
2538 first = FALSE;
2539 Ustrcpy(p, rf_names[i]);
2540 while (*p) p++;
2541 }
2542 }
2543
2544 if (addr->dsn_orcpt)
2545 {
2546 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2547 addr->dsn_orcpt);
2548 while (*p) p++;
2549 }
2550 }
2551 }
2552
2553
2554
2555 /*
2556 Return:
2557 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2558 -1 MAIL response error
2559 -2 any non-MAIL read i/o error
2560 -3 non-MAIL response timeout
2561 -4 internal error; channel still usable
2562 -5 transmit failed
2563 */
2564
2565 int
2566 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2567 {
2568 address_item * addr;
2569 int address_count;
2570 int rc;
2571
2572 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2573 {
2574 *yield = ERROR;
2575 return -4;
2576 }
2577
2578 /* From here until we send the DATA command, we can make use of PIPELINING
2579 if the server host supports it. The code has to be able to check the responses
2580 at any point, for when the buffer fills up, so we write it totally generally.
2581 When PIPELINING is off, each command written reports that it has flushed the
2582 buffer. */
2583
2584 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2585
2586 {
2587 uschar * s = sx->from_addr;
2588 #ifdef SUPPORT_I18N
2589 uschar * errstr = NULL;
2590
2591 /* If we must downconvert, do the from-address here. Remember we had to
2592 for the to-addresses (done below), and also (ugly) for re-doing when building
2593 the delivery log line. */
2594
2595 if ( sx->addrlist->prop.utf8_msg
2596 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2597 )
2598 {
2599 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2600 {
2601 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2602 *yield = ERROR;
2603 return -4;
2604 }
2605 setflag(sx->addrlist, af_utf8_downcvt);
2606 }
2607 #endif
2608
2609 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2610 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2611 }
2612
2613 mail_command = string_copy(big_buffer); /* Save for later error message */
2614
2615 switch(rc)
2616 {
2617 case -1: /* Transmission error */
2618 return -5;
2619
2620 case +1: /* Cmd was sent */
2621 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2622 sx->ob->command_timeout))
2623 {
2624 if (errno == 0 && sx->buffer[0] == '4')
2625 {
2626 errno = ERRNO_MAIL4XX;
2627 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2628 }
2629 return -1;
2630 }
2631 sx->pending_MAIL = FALSE;
2632 break;
2633
2634 /* otherwise zero: command queued for pipeline */
2635 }
2636
2637 /* Pass over all the relevant recipient addresses for this host, which are the
2638 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2639 several before we have to read the responses for those seen so far. This
2640 checking is done by a subroutine because it also needs to be done at the end.
2641 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2642 the next one if not all are sent.
2643
2644 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2645 last address because we want to abort if any recipients have any kind of
2646 problem, temporary or permanent. We know that all recipient addresses will have
2647 the PENDING_DEFER status, because only one attempt is ever made, and we know
2648 that max_rcpt will be large, so all addresses will be done at once.
2649
2650 For verify we flush the pipeline after any (the only) rcpt address. */
2651
2652 for (addr = sx->first_addr, address_count = 0;
2653 addr && address_count < sx->max_rcpt;
2654 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2655 {
2656 int count;
2657 BOOL no_flush;
2658 uschar * rcpt_addr;
2659
2660 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2661 {
2662 setflag(addr, af_tcp_fastopen_conn);
2663 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2664 }
2665
2666 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2667 ? dsn_support_yes : dsn_support_no;
2668
2669 address_count++;
2670 no_flush = pipelining_active && !sx->verify
2671 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2672
2673 build_rcptcmd_options(sx, addr);
2674
2675 /* Now send the RCPT command, and process outstanding responses when
2676 necessary. After a timeout on RCPT, we just end the function, leaving the
2677 yield as OK, because this error can often mean that there is a problem with
2678 just one address, so we don't want to delay the host. */
2679
2680 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2681
2682 #ifdef SUPPORT_I18N
2683 if ( testflag(sx->addrlist, af_utf8_downcvt)
2684 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2685 )
2686 {
2687 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2688 errno = ERRNO_EXPANDFAIL;
2689 return -5; /*XXX too harsh? */
2690 }
2691 #endif
2692
2693 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2694 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2695
2696 if (count < 0) return -5;
2697 if (count > 0)
2698 {
2699 switch(sync_responses(sx, count, 0))
2700 {
2701 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2702 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2703 break;
2704
2705 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2706 if (!sx->lmtp) /* can't tell about progress yet */
2707 sx->completed_addr = TRUE;
2708 case 0: /* No 2xx or 5xx, but no probs */
2709 break;
2710
2711 case -1: return -3; /* Timeout on RCPT */
2712 case -2: return -2; /* non-MAIL read i/o error */
2713 default: return -1; /* any MAIL error */
2714 }
2715 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2716 }
2717 } /* Loop for next address */
2718
2719 tcp_out_fastopen_logged = TRUE;
2720 sx->next_addr = addr;
2721 return 0;
2722 }
2723
2724
2725 #ifdef SUPPORT_TLS
2726 /*****************************************************
2727 * Proxy TLS connection for another transport process *
2728 ******************************************************/
2729 /*
2730 Close the unused end of the pipe, fork once more, then use the given buffer
2731 as a staging area, and select on both the given fd and the TLS'd client-fd for
2732 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2733 Do blocking full-size writes, and reads under a timeout. Once both input
2734 channels are closed, exit the process.
2735
2736 Arguments:
2737 ct_ctx tls context
2738 buf space to use for buffering
2739 bufsiz size of buffer
2740 pfd pipe filedescriptor array; [0] is comms to proxied process
2741 timeout per-read timeout, seconds
2742 */
2743
2744 void
2745 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
2746 int timeout)
2747 {
2748 fd_set rfds, efds;
2749 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
2750 int rc, i, fd_bits, nbytes;
2751
2752 close(pfd[1]);
2753 if ((rc = fork()))
2754 {
2755 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2756 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2757 }
2758
2759 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2760 set_process_info("proxying TLS connection for continued transport");
2761 FD_ZERO(&rfds);
2762 FD_SET(tls_out.active.sock, &rfds);
2763 FD_SET(pfd[0], &rfds);
2764
2765 for (fd_bits = 3; fd_bits; )
2766 {
2767 time_t time_left = timeout;
2768 time_t time_start = time(NULL);
2769
2770 /* wait for data */
2771 efds = rfds;
2772 do
2773 {
2774 struct timeval tv = { time_left, 0 };
2775
2776 rc = select(max_fd,
2777 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2778
2779 if (rc < 0 && errno == EINTR)
2780 if ((time_left -= time(NULL) - time_start) > 0) continue;
2781
2782 if (rc <= 0)
2783 {
2784 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2785 goto done;
2786 }
2787
2788 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
2789 {
2790 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2791 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2792 goto done;
2793 }
2794 }
2795 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
2796
2797 /* handle inbound data */
2798 if (FD_ISSET(tls_out.active.sock, &rfds))
2799 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
2800 {
2801 fd_bits &= ~1;
2802 FD_CLR(tls_out.active.sock, &rfds);
2803 shutdown(pfd[0], SHUT_WR);
2804 timeout = 5;
2805 }
2806 else
2807 {
2808 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2809 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2810 }
2811 else if (fd_bits & 1)
2812 FD_SET(tls_out.active.sock, &rfds);
2813
2814 /* handle outbound data */
2815 if (FD_ISSET(pfd[0], &rfds))
2816 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2817 {
2818 fd_bits = 0;
2819 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
2820 ct_ctx = NULL;
2821 }
2822 else
2823 {
2824 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2825 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
2826 goto done;
2827 }
2828 else if (fd_bits & 2)
2829 FD_SET(pfd[0], &rfds);
2830 }
2831
2832 done:
2833 if (running_in_test_harness) millisleep(100); /* let logging complete */
2834 exim_exit(0, US"TLS proxy");
2835 }
2836 #endif
2837
2838
2839 /*************************************************
2840 * Deliver address list to given host *
2841 *************************************************/
2842
2843 /* If continue_hostname is not null, we get here only when continuing to
2844 deliver down an existing channel. The channel was passed as the standard
2845 input. TLS is never active on a passed channel; the previous process always
2846 closes it down before passing the connection on.
2847
2848 Otherwise, we have to make a connection to the remote host, and do the
2849 initial protocol exchange.
2850
2851 When running as an MUA wrapper, if the sender or any recipient is rejected,
2852 temporarily or permanently, we force failure for all recipients.
2853
2854 Arguments:
2855 addrlist chain of potential addresses to deliver; only those whose
2856 transport_return field is set to PENDING_DEFER are currently
2857 being processed; others should be skipped - they have either
2858 been delivered to an earlier host or IP address, or been
2859 failed by one of them.
2860 host host to deliver to
2861 host_af AF_INET or AF_INET6
2862 defport default TCP/IP port to use if host does not specify, in host
2863 byte order
2864 interface interface to bind to, or NULL
2865 tblock transport instance block
2866 message_defer set TRUE if yield is OK, but all addresses were deferred
2867 because of a non-recipient, non-host failure, that is, a
2868 4xx response to MAIL FROM, DATA, or ".". This is a defer
2869 that is specific to the message.
2870 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2871 a second attempt after TLS initialization fails
2872
2873 Returns: OK - the connection was made and the delivery attempted;
2874 the result for each address is in its data block.
2875 DEFER - the connection could not be made, or something failed
2876 while setting up the SMTP session, or there was a
2877 non-message-specific error, such as a timeout.
2878 ERROR - a filter command is specified for this transport,
2879 and there was a problem setting it up; OR helo_data
2880 or add_headers or authenticated_sender is specified
2881 for this transport, and the string failed to expand
2882 */
2883
2884 static int
2885 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2886 uschar *interface, transport_instance *tblock,
2887 BOOL *message_defer, BOOL suppress_tls)
2888 {
2889 address_item *addr;
2890 int yield = OK;
2891 int save_errno;
2892 int rc;
2893 struct timeval start_delivery_time;
2894
2895 BOOL pass_message = FALSE;
2896 uschar *message = NULL;
2897 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2898
2899 smtp_context sx;
2900
2901 gettimeofday(&start_delivery_time, NULL);
2902 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2903 *message_defer = FALSE;
2904
2905 sx.addrlist = addrlist;
2906 sx.host = host;
2907 sx.host_af = host_af,
2908 sx.port = defport;
2909 sx.interface = interface;
2910 sx.helo_data = NULL;
2911 sx.tblock = tblock;
2912 sx.verify = FALSE;
2913
2914 /* Get the channel set up ready for a message (MAIL FROM being the next
2915 SMTP command to send */
2916
2917 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2918 return rc;
2919
2920 /* If there is a filter command specified for this transport, we can now
2921 set it up. This cannot be done until the identify of the host is known. */
2922
2923 if (tblock->filter_command)
2924 {
2925 transport_filter_timeout = tblock->filter_timeout;
2926
2927 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2928 yield ERROR. */
2929
2930 if (!transport_set_up_command(&transport_filter_argv,
2931 tblock->filter_command, TRUE, DEFER, addrlist,
2932 string_sprintf("%.50s transport", tblock->name), NULL))
2933 {
2934 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2935 FALSE);
2936 yield = ERROR;
2937 goto SEND_QUIT;
2938 }
2939
2940 if ( transport_filter_argv
2941 && *transport_filter_argv
2942 && **transport_filter_argv
2943 && sx.peer_offered & OPTION_CHUNKING
2944 )
2945 {
2946 sx.peer_offered &= ~OPTION_CHUNKING;
2947 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2948 }
2949 }
2950
2951 sx.first_addr = addrlist;
2952
2953 /* For messages that have more than the maximum number of envelope recipients,
2954 we want to send several transactions down the same SMTP connection. (See
2955 comments in deliver.c as to how this reconciles, heuristically, with
2956 remote_max_parallel.) This optimization was added to Exim after the following
2957 code was already working. The simplest way to put it in without disturbing the
2958 code was to use a goto to jump back to this point when there is another
2959 transaction to handle. */
2960
2961 SEND_MESSAGE:
2962 sx.from_addr = return_path;
2963 sx.sync_addr = sx.first_addr;
2964 sx.ok = FALSE;
2965 sx.send_rset = TRUE;
2966 sx.completed_addr = FALSE;
2967
2968
2969 /* If we are a continued-connection-after-verify the MAIL and RCPT
2970 commands were already sent; do not re-send but do mark the addrs as
2971 having been accepted up to RCPT stage. A traditional cont-conn
2972 always has a sequence number greater than one. */
2973
2974 if (continue_hostname && continue_sequence == 1)
2975 {
2976 address_item * addr;
2977
2978 sx.peer_offered = smtp_peer_options;
2979 sx.pending_MAIL = FALSE;
2980 sx.ok = TRUE;
2981 sx.next_addr = NULL;
2982
2983 for (addr = addrlist; addr; addr = addr->next)
2984 addr->transport_return = PENDING_OK;
2985 }
2986 else
2987 {
2988 /* Initiate a message transfer. */
2989
2990 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2991 {
2992 case 0: break;
2993 case -1: case -2: goto RESPONSE_FAILED;
2994 case -3: goto END_OFF;
2995 case -4: goto SEND_QUIT;
2996 default: goto SEND_FAILED;
2997 }
2998
2999 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3000 permanently or temporarily. We should have flushed and synced after the last
3001 RCPT. */
3002
3003 if (mua_wrapper)
3004 {
3005 address_item * a;
3006 unsigned cnt;
3007
3008 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3009 if (a->transport_return != PENDING_OK)
3010 {
3011 /*XXX could we find a better errno than 0 here? */
3012 set_errno_nohost(addrlist, 0, a->message, FAIL,
3013 testflag(a, af_pass_message));
3014 sx.ok = FALSE;
3015 break;
3016 }
3017 }
3018 }
3019
3020 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3021 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3022 have a good recipient buffered up if we are pipelining. We don't want to waste
3023 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3024 are pipelining. The responses are all handled by sync_responses().
3025 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3026 to send is. */
3027
3028 if ( !(sx.peer_offered & OPTION_CHUNKING)
3029 && (sx.ok || (pipelining_active && !mua_wrapper)))
3030 {
3031 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
3032
3033 if (count < 0) goto SEND_FAILED;
3034 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3035 {
3036 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3037 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3038 break;
3039
3040 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3041 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3042 case 0: break; /* No 2xx or 5xx, but no probs */
3043
3044 case -1: goto END_OFF; /* Timeout on RCPT */
3045 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3046 }
3047 pipelining_active = FALSE;
3048 data_command = string_copy(big_buffer); /* Save for later error message */
3049 }
3050
3051 /* If there were no good recipients (but otherwise there have been no
3052 problems), just set ok TRUE, since we have handled address-specific errors
3053 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3054 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3055 well as body. Set the appropriate timeout value to be used for each chunk.
3056 (Haven't been able to make it work using select() for writing yet.) */
3057
3058 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3059 {
3060 /* Save the first address of the next batch. */
3061 sx.first_addr = sx.next_addr;
3062
3063 sx.ok = TRUE;
3064 }
3065 else
3066 {
3067 transport_ctx tctx = {
3068 {sx.cctx.sock}, /*XXX will this need TLS info? */
3069 tblock,
3070 addrlist,
3071 US".", US"..", /* Escaping strings */
3072 topt_use_crlf | topt_escape_headers
3073 | (tblock->body_only ? topt_no_headers : 0)
3074 | (tblock->headers_only ? topt_no_body : 0)
3075 | (tblock->return_path_add ? topt_add_return_path : 0)
3076 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3077 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3078 };
3079
3080 /* If using CHUNKING we need a callback from the generic transport
3081 support to us, for the sending of BDAT smtp commands and the reaping
3082 of responses. The callback needs a whole bunch of state so set up
3083 a transport-context structure to be passed around. */
3084
3085 if (sx.peer_offered & OPTION_CHUNKING)
3086 {
3087 tctx.check_string = tctx.escape_string = NULL;
3088 tctx.options |= topt_use_bdat;
3089 tctx.chunk_cb = smtp_chunk_cmd_callback;
3090 sx.pending_BDAT = FALSE;
3091 sx.good_RCPT = sx.ok;
3092 sx.cmd_count = 0;
3093 tctx.smtp_context = &sx;
3094 }
3095 else
3096 tctx.options |= topt_end_dot;
3097
3098 /* Save the first address of the next batch. */
3099 sx.first_addr = sx.next_addr;
3100
3101 /* Responses from CHUNKING commands go in buffer. Otherwise,
3102 there has not been a response. */
3103
3104 sx.buffer[0] = 0;
3105
3106 sigalrm_seen = FALSE;
3107 transport_write_timeout = sx.ob->data_timeout;
3108 smtp_command = US"sending data block"; /* For error messages */
3109 DEBUG(D_transport|D_v)
3110 if (sx.peer_offered & OPTION_CHUNKING)
3111 debug_printf(" will write message using CHUNKING\n");
3112 else
3113 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3114 transport_count = 0;
3115
3116 #ifndef DISABLE_DKIM
3117 dkim_exim_sign_init();
3118 # ifdef EXPERIMENTAL_ARC
3119 {
3120 uschar * s = sx.ob->arc_sign;
3121 if (s)
3122 {
3123 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3124 {
3125 if (!expand_string_forcedfail)
3126 {
3127 message = US"failed to expand arc_sign";
3128 sx.ok = FALSE;
3129 goto SEND_FAILED;
3130 }
3131 }
3132 else if (*s)
3133 {
3134 /* Ask dkim code to hash the body for ARC */
3135 (void) arc_ams_setup_sign_bodyhash();
3136 sx.ob->dkim.force_bodyhash = TRUE;
3137 }
3138 }
3139 }
3140 # endif
3141 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3142 #else
3143 sx.ok = transport_write_message(&tctx, 0);
3144 #endif
3145
3146 /* transport_write_message() uses write() because it is called from other
3147 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3148 it can exit with "Broken pipe" as its error. This really means that the
3149 socket got closed at the far end. */
3150
3151 transport_write_timeout = 0; /* for subsequent transports */
3152
3153 /* Failure can either be some kind of I/O disaster (including timeout),
3154 or the failure of a transport filter or the expansion of added headers.
3155 Or, when CHUNKING, it can be a protocol-detected failure. */
3156
3157 if (!sx.ok)
3158 if (message) goto SEND_FAILED;
3159 else goto RESPONSE_FAILED;
3160
3161 /* We used to send the terminating "." explicitly here, but because of
3162 buffering effects at both ends of TCP/IP connections, you don't gain
3163 anything by keeping it separate, so it might as well go in the final
3164 data buffer for efficiency. This is now done by setting the topt_end_dot
3165 flag above. */
3166
3167 smtp_command = US"end of data";
3168
3169 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3170 {
3171 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3172 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3173 {
3174 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3175 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3176 break;
3177
3178 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3179 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3180 case 0: break; /* No 2xx or 5xx, but no probs */
3181
3182 case -1: goto END_OFF; /* Timeout on RCPT */
3183 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3184 }
3185 }
3186
3187 #ifndef DISABLE_PRDR
3188 /* For PRDR we optionally get a partial-responses warning
3189 * followed by the individual responses, before going on with
3190 * the overall response. If we don't get the warning then deal
3191 * with per non-PRDR. */
3192 if(sx.prdr_active)
3193 {
3194 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3195 sx.ob->final_timeout);
3196 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3197 {
3198 case '2': sx.prdr_active = FALSE;
3199 sx.ok = TRUE;
3200 break;
3201 case '4': errno = ERRNO_DATA4XX;
3202 addrlist->more_errno |=
3203 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3204 break;
3205 }
3206 }
3207 else
3208 #endif
3209
3210 /* For non-PRDR SMTP, we now read a single response that applies to the
3211 whole message. If it is OK, then all the addresses have been delivered. */
3212
3213 if (!sx.lmtp)
3214 {
3215 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3216 sx.ob->final_timeout);
3217 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3218 {
3219 errno = ERRNO_DATA4XX;
3220 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3221 }
3222 }
3223
3224 /* For LMTP, we get back a response for every RCPT command that we sent;
3225 some may be accepted and some rejected. For those that get a response, their
3226 status is fixed; any that are accepted have been handed over, even if later
3227 responses crash - at least, that's how I read RFC 2033.
3228
3229 If all went well, mark the recipient addresses as completed, record which
3230 host/IPaddress they were delivered to, and cut out RSET when sending another
3231 message down the same channel. Write the completed addresses to the journal
3232 now so that they are recorded in case there is a crash of hardware or
3233 software before the spool gets updated. Also record the final SMTP
3234 confirmation if needed (for SMTP only). */
3235
3236 if (sx.ok)
3237 {
3238 int flag = '=';
3239 struct timeval delivery_time;
3240 int len;
3241 uschar * conf = NULL;
3242
3243 timesince(&delivery_time, &start_delivery_time);
3244 sx.send_rset = FALSE;
3245 pipelining_active = FALSE;
3246
3247 /* Set up confirmation if needed - applies only to SMTP */
3248
3249 if (
3250 #ifdef DISABLE_EVENT
3251 LOGGING(smtp_confirmation) &&
3252 #endif
3253 !sx.lmtp
3254 )
3255 {
3256 const uschar *s = string_printing(sx.buffer);
3257 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3258 conf = (s == sx.buffer)? US string_copy(s) : US s;
3259 }
3260
3261 /* Process all transported addresses - for LMTP or PRDR, read a status for
3262 each one. */
3263
3264 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3265 {
3266 if (addr->transport_return != PENDING_OK) continue;
3267
3268 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3269 remaining addresses. Otherwise, it's a return code for just the one
3270 address. For temporary errors, add a retry item for the address so that
3271 it doesn't get tried again too soon. */
3272
3273 #ifndef DISABLE_PRDR
3274 if (sx.lmtp || sx.prdr_active)
3275 #else
3276 if (sx.lmtp)
3277 #endif
3278 {
3279 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3280 sx.ob->final_timeout))
3281 {
3282 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3283 addr->message = string_sprintf(
3284 #ifndef DISABLE_PRDR
3285 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3286 #else
3287 "LMTP error after %s: %s",
3288 #endif
3289 data_command, string_printing(sx.buffer));
3290 setflag(addr, af_pass_message); /* Allow message to go to user */
3291 if (sx.buffer[0] == '5')
3292 addr->transport_return = FAIL;
3293 else
3294 {
3295 errno = ERRNO_DATA4XX;
3296 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3297 addr->transport_return = DEFER;
3298 #ifndef DISABLE_PRDR
3299 if (!sx.prdr_active)
3300 #endif
3301 retry_add_item(addr, addr->address_retry_key, 0);
3302 }
3303 continue;
3304 }
3305 sx.completed_addr = TRUE; /* NOW we can set this flag */
3306 if (LOGGING(smtp_confirmation))
3307 {
3308 const uschar *s = string_printing(sx.buffer);
3309 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3310 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3311 }
3312 }
3313
3314 /* SMTP, or success return from LMTP for this address. Pass back the
3315 actual host that was used. */
3316
3317 addr->transport_return = OK;
3318 addr->more_errno = delivery_time.tv_sec;
3319 addr->delivery_usec = delivery_time.tv_usec;
3320 addr->host_used = host;
3321 addr->special_action = flag;
3322 addr->message = conf;
3323 #ifndef DISABLE_PRDR
3324 if (sx.prdr_active) setflag(addr, af_prdr_used);
3325 #endif
3326 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3327 flag = '-';
3328
3329 #ifndef DISABLE_PRDR
3330 if (!sx.prdr_active)
3331 #endif
3332 {
3333 /* Update the journal. For homonymic addresses, use the base address plus
3334 the transport name. See lots of comments in deliver.c about the reasons
3335 for the complications when homonyms are involved. Just carry on after
3336 write error, as it may prove possible to update the spool file later. */
3337
3338 if (testflag(addr, af_homonym))
3339 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3340 else
3341 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3342
3343 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3344 len = Ustrlen(CS sx.buffer);
3345 if (write(journal_fd, sx.buffer, len) != len)
3346 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3347 "%s: %s", sx.buffer, strerror(errno));
3348 }
3349 }
3350
3351 #ifndef DISABLE_PRDR
3352 if (sx.prdr_active)
3353 {
3354 const uschar * overall_message;
3355
3356 /* PRDR - get the final, overall response. For any non-success
3357 upgrade all the address statuses. */
3358
3359 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3360 sx.ob->final_timeout);
3361 if (!sx.ok)
3362 {
3363 if(errno == 0 && sx.buffer[0] == '4')
3364 {
3365 errno = ERRNO_DATA4XX;
3366 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3367 }
3368 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3369 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3370 addr->transport_return = PENDING_OK; /* allow set_errno action */
3371 goto RESPONSE_FAILED;
3372 }
3373
3374 /* Append the overall response to the individual PRDR response for logging
3375 and update the journal, or setup retry. */
3376
3377 overall_message = string_printing(sx.buffer);
3378 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3379 if (addr->transport_return == OK)
3380 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3381
3382 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3383 if (addr->transport_return == OK)
3384 {
3385 if (testflag(addr, af_homonym))
3386 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3387 else
3388 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3389
3390 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3391 len = Ustrlen(CS sx.buffer);
3392 if (write(journal_fd, sx.buffer, len) != len)
3393 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3394 "%s: %s", sx.buffer, strerror(errno));
3395 }
3396 else if (addr->transport_return == DEFER)
3397 retry_add_item(addr, addr->address_retry_key, -2);
3398 }
3399 #endif
3400
3401 /* Ensure the journal file is pushed out to disk. */
3402
3403 if (EXIMfsync(journal_fd) < 0)
3404 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3405 strerror(errno));
3406 }
3407 }
3408
3409
3410 /* Handle general (not specific to one address) failures here. The value of ok
3411 is used to skip over this code on the falling through case. A timeout causes a
3412 deferral. Other errors may defer or fail according to the response code, and
3413 may set up a special errno value, e.g. after connection chopped, which is
3414 assumed if errno == 0 and there is no text in the buffer. If control reaches
3415 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3416 the problem is not related to this specific message. */
3417
3418 if (!sx.ok)
3419 {
3420 int code, set_rc;
3421 uschar * set_message;
3422
3423 RESPONSE_FAILED:
3424 {
3425 save_errno = errno;
3426 message = NULL;
3427 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3428 sx.buffer, &code, &message, &pass_message);
3429 goto FAILED;
3430 }
3431
3432 SEND_FAILED:
3433 {
3434 save_errno = errno;
3435 code = '4';
3436 message = string_sprintf("send() to %s [%s] failed: %s",
3437 host->name, host->address, message ? message : US strerror(save_errno));
3438 sx.send_quit = FALSE;
3439 goto FAILED;
3440 }
3441
3442 FAILED:
3443 {
3444 BOOL message_error;
3445
3446 sx.ok = FALSE; /* For when reached by GOTO */
3447 set_message = message;
3448
3449 /* We want to handle timeouts after MAIL or "." and loss of connection after
3450 "." specially. They can indicate a problem with the sender address or with
3451 the contents of the message rather than a real error on the connection. These
3452 cases are treated in the same way as a 4xx response. This next bit of code
3453 does the classification. */
3454
3455 switch(save_errno)
3456 {
3457 case 0:
3458 case ERRNO_MAIL4XX:
3459 case ERRNO_DATA4XX:
3460 message_error = TRUE;
3461 break;
3462
3463 case ETIMEDOUT:
3464 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3465 Ustrncmp(smtp_command,"end ",4) == 0;
3466 break;
3467
3468 case ERRNO_SMTPCLOSED:
3469 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3470 break;
3471
3472 default:
3473 message_error = FALSE;
3474 break;
3475 }
3476
3477 /* Handle the cases that are treated as message errors. These are:
3478
3479 (a) negative response or timeout after MAIL
3480 (b) negative response after DATA
3481 (c) negative response or timeout or dropped connection after "."
3482 (d) utf8 support required and not offered
3483
3484 It won't be a negative response or timeout after RCPT, as that is dealt
3485 with separately above. The action in all cases is to set an appropriate
3486 error code for all the addresses, but to leave yield set to OK because the
3487 host itself has not failed. Of course, it might in practice have failed
3488 when we've had a timeout, but if so, we'll discover that at the next
3489 delivery attempt. For a temporary error, set the message_defer flag, and
3490 write to the logs for information if this is not the last host. The error
3491 for the last host will be logged as part of the address's log line. */
3492
3493 if (message_error)
3494 {
3495 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3496
3497 /* If there's an errno, the message contains just the identity of
3498 the host. */
3499
3500 if (code == '5')
3501 set_rc = FAIL;
3502 else /* Anything other than 5 is treated as temporary */
3503 {
3504 set_rc = DEFER;
3505 if (save_errno > 0)
3506 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3507
3508 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3509
3510 *message_defer = TRUE;
3511 }
3512 }
3513
3514 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3515 ".", or some other transportation error. We defer all addresses and yield
3516 DEFER, except for the case of failed add_headers expansion, or a transport
3517 filter failure, when the yield should be ERROR, to stop it trying other
3518 hosts. */
3519
3520 else
3521 {
3522 set_rc = DEFER;
3523 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3524 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3525 }
3526 }
3527
3528 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3529 #ifdef EXPERIMENTAL_DSN_INFO
3530 , sx.smtp_greeting, sx.helo_response
3531 #endif
3532 );
3533 }
3534
3535
3536 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3537 SMTP session tidily. However, if there were too many addresses to send in one
3538 message (indicated by first_addr being non-NULL) we want to carry on with the
3539 rest of them. Also, it is desirable to send more than one message down the SMTP
3540 connection if there are several waiting, provided we haven't already sent so
3541 many as to hit the configured limit. The function transport_check_waiting looks
3542 for a waiting message and returns its id. Then transport_pass_socket tries to
3543 set up a continued delivery by passing the socket on to another process. The
3544 variable send_rset is FALSE if a message has just been successfully transfered.
3545
3546 If we are already sending down a continued channel, there may be further
3547 addresses not yet delivered that are aimed at the same host, but which have not
3548 been passed in this run of the transport. In this case, continue_more will be
3549 true, and all we should do is send RSET if necessary, and return, leaving the
3550 channel open.
3551
3552 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3553 do not want to continue with other messages down the same channel, because that
3554 can lead to looping between two or more messages, all with the same,
3555 temporarily failing address(es). [The retry information isn't updated yet, so
3556 new processes keep on trying.] We probably also don't want to try more of this
3557 message's addresses either.
3558
3559 If we have started a TLS session, we have to end it before passing the
3560 connection to a new process. However, not all servers can handle this (Exim
3561 can), so we do not pass such a connection on if the host matches
3562 hosts_nopass_tls. */
3563
3564 DEBUG(D_transport)
3565 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3566 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3567 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3568
3569 if (sx.completed_addr && sx.ok && sx.send_quit)
3570 {
3571 BOOL more;
3572 smtp_compare_t t_compare;
3573
3574 t_compare.tblock = tblock;
3575 t_compare.current_sender_address = sender_address;
3576
3577 if ( sx.first_addr != NULL
3578 || continue_more
3579 || (
3580 #ifdef SUPPORT_TLS
3581 ( tls_out.active.sock < 0 && !continue_proxy_cipher
3582 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3583 )
3584 &&
3585 #endif
3586 transport_check_waiting(tblock->name, host->name,
3587 tblock->connection_max_messages, new_message_id, &more,
3588 (oicf)smtp_are_same_identities, (void*)&t_compare)
3589 ) )
3590 {
3591 uschar *msg;
3592 BOOL pass_message;
3593
3594 if (sx.send_rset)
3595 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3596 {
3597 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3598 host->address, strerror(errno));
3599 sx.send_quit = FALSE;
3600 }
3601 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3602 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3603 {
3604 int code;
3605 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3606 &pass_message);
3607 if (!sx.send_quit)
3608 {
3609 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3610 host->name, host->address, msg);
3611 }
3612 }
3613
3614 /* Either RSET was not needed, or it succeeded */
3615
3616 if (sx.ok)
3617 {
3618 int pfd[2];
3619 int socket_fd = sx.cctx.sock;
3620
3621
3622 if (sx.first_addr != NULL) /* More addresses still to be sent */
3623 { /* in this run of the transport */
3624 continue_sequence++; /* Causes * in logging */
3625 goto SEND_MESSAGE;
3626 }
3627
3628 /* Unless caller said it already has more messages listed for this host,
3629 pass the connection on to a new Exim process (below, the call to
3630 transport_pass_socket). If the caller has more ready, just return with
3631 the connection still open. */
3632
3633 #ifdef SUPPORT_TLS
3634 if (tls_out.active.sock >= 0)
3635 if ( continue_more
3636 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3637 {
3638 /* Before passing the socket on, or returning to caller with it still
3639 open, we must shut down TLS. Not all MTAs allow for the continuation
3640 of the SMTP session when TLS is shut down. We test for this by sending
3641 a new EHLO. If we don't get a good response, we don't attempt to pass
3642 the socket on. */
3643
3644 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
3645 sx.cctx.tls_ctx = NULL;
3646 smtp_peer_options = smtp_peer_options_wrap;
3647 sx.ok = !sx.smtps
3648 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3649 "EHLO %s\r\n", sx.helo_data) >= 0
3650 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3651 '2', sx.ob->command_timeout);
3652
3653 if (sx.ok && continue_more)
3654 return yield; /* More addresses for another run */
3655 }
3656 else
3657 {
3658 /* Set up a pipe for proxying TLS for the new transport process */
3659
3660 smtp_peer_options |= OPTION_TLS;
3661 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3662 socket_fd = pfd[1];
3663 else
3664 set_errno(sx.first_addr, errno, US"internal allocation problem",
3665 DEFER, FALSE, host
3666 # ifdef EXPERIMENTAL_DSN_INFO
3667 , sx.smtp_greeting, sx.helo_response
3668 # endif
3669 );
3670 }
3671 else
3672 #endif
3673 if (continue_more)
3674 return yield; /* More addresses for another run */
3675
3676 /* If the socket is successfully passed, we mustn't send QUIT (or
3677 indeed anything!) from here. */
3678
3679 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3680 propagate it from the initial
3681 */
3682 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3683 host->address, new_message_id, socket_fd))
3684 {
3685 sx.send_quit = FALSE;
3686
3687 /* We have passed the client socket to a fresh transport process.
3688 If TLS is still active, we need to proxy it for the transport we
3689 just passed the baton to. Fork a child to to do it, and return to
3690 get logging done asap. Which way to place the work makes assumptions
3691 about post-fork prioritisation which may not hold on all platforms. */
3692 #ifdef SUPPORT_TLS
3693 if (tls_out.active.sock >= 0)
3694 {
3695 int pid = fork();
3696 if (pid == 0) /* child; fork again to disconnect totally */
3697 {
3698 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3699 /* does not return */
3700 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
3701 sx.ob->command_timeout);
3702 }
3703
3704 if (pid > 0) /* parent */
3705 {
3706 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3707 close(pfd[0]);
3708 /* tidy the inter-proc to disconn the proxy proc */
3709 waitpid(pid, NULL, 0);
3710 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
3711 sx.cctx.tls_ctx = NULL;
3712 (void)close(sx.cctx.sock);
3713 sx.cctx.sock = -1;
3714 continue_transport = NULL;
3715 continue_hostname = NULL;
3716 return yield;
3717 }
3718 log_write(0, LOG_PANIC_DIE, "fork failed");
3719 }
3720 #endif
3721 }
3722 }
3723
3724 /* If RSET failed and there are addresses left, they get deferred. */
3725 else
3726 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3727 #ifdef EXPERIMENTAL_DSN_INFO
3728 , sx.smtp_greeting, sx.helo_response
3729 #endif
3730 );
3731 }
3732 }
3733
3734 /* End off tidily with QUIT unless the connection has died or the socket has
3735 been passed to another process. There has been discussion on the net about what
3736 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3737 to wait for a response, but on the other hand, there isn't anything one can do
3738 with an error response, other than log it. Exim used to do that. However,
3739 further discussion suggested that it is positively advantageous not to wait for
3740 the response, but to close the session immediately. This is supposed to move
3741 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3742 load from the server. (Hosts that are both servers and clients may not see much
3743 difference, of course.) Further discussion indicated that this was safe to do
3744 on Unix systems which have decent implementations of TCP/IP that leave the
3745 connection around for a while (TIME_WAIT) after the application has gone away.
3746 This enables the response sent by the server to be properly ACKed rather than
3747 timed out, as can happen on broken TCP/IP implementations on other OS.
3748
3749 This change is being made on 31-Jul-98. After over a year of trouble-free
3750 operation, the old commented-out code was removed on 17-Sep-99. */
3751
3752 SEND_QUIT:
3753 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3754
3755 END_OFF:
3756
3757 #ifdef SUPPORT_TLS
3758 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3759 sx.cctx.tls_ctx = NULL;
3760 #endif
3761
3762 /* Close the socket, and return the appropriate value, first setting
3763 works because the NULL setting is passed back to the calling process, and
3764 remote_max_parallel is forced to 1 when delivering over an existing connection,
3765
3766 If all went well and continue_more is set, we shouldn't actually get here if
3767 there are further addresses, as the return above will be taken. However,
3768 writing RSET might have failed, or there may be other addresses whose hosts are
3769 specified in the transports, and therefore not visible at top level, in which
3770 case continue_more won't get set. */
3771
3772 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3773 if (sx.send_quit)
3774 {
3775 shutdown(sx.cctx.sock, SHUT_WR);
3776 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3777 for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3778 rc--; /* drain socket */
3779 }
3780 (void)close(sx.cctx.sock);
3781
3782 #ifndef DISABLE_EVENT
3783 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3784 #endif
3785
3786 continue_transport = NULL;
3787 continue_hostname = NULL;
3788 return yield;
3789 }
3790
3791
3792
3793
3794 /*************************************************
3795 * Closedown entry point *
3796 *************************************************/
3797
3798 /* This function is called when exim is passed an open smtp channel
3799 from another incarnation, but the message which it has been asked
3800 to deliver no longer exists. The channel is on stdin.
3801
3802 We might do fancy things like looking for another message to send down
3803 the channel, but if the one we sought has gone, it has probably been
3804 delivered by some other process that itself will seek further messages,
3805 so just close down our connection.
3806
3807 Argument: pointer to the transport instance block
3808 Returns: nothing
3809 */
3810
3811 void
3812 smtp_transport_closedown(transport_instance *tblock)
3813 {
3814 smtp_transport_options_block *ob =
3815 (smtp_transport_options_block *)tblock->options_block;
3816 client_conn_ctx cctx;
3817 smtp_inblock inblock;
3818 smtp_outblock outblock;
3819 uschar buffer[256];
3820 uschar inbuffer[4096];
3821 uschar outbuffer[16];
3822
3823 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
3824 cctx.sock = fileno(stdin);
3825 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
3826
3827 inblock.cctx = &cctx;
3828 inblock.buffer = inbuffer;
3829 inblock.buffersize = sizeof(inbuffer);
3830 inblock.ptr = inbuffer;
3831 inblock.ptrend = inbuffer;
3832
3833 outblock.cctx = &cctx;
3834 outblock.buffersize = sizeof(outbuffer);
3835 outblock.buffer = outbuffer;
3836 outblock.ptr = outbuffer;
3837 outblock.cmd_count = 0;
3838 outblock.authenticating = FALSE;
3839
3840 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3841 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3842 ob->command_timeout);
3843 (void)close(cctx.sock);
3844 }
3845
3846
3847
3848 /*************************************************
3849 * Prepare addresses for delivery *
3850 *************************************************/
3851
3852 /* This function is called to flush out error settings from previous delivery
3853 attempts to other hosts. It also records whether we got here via an MX record
3854 or not in the more_errno field of the address. We are interested only in
3855 addresses that are still marked DEFER - others may have got delivered to a
3856 previously considered IP address. Set their status to PENDING_DEFER to indicate
3857 which ones are relevant this time.
3858
3859 Arguments:
3860 addrlist the list of addresses
3861 host the host we are delivering to
3862
3863 Returns: the first address for this delivery
3864 */
3865
3866 static address_item *
3867 prepare_addresses(address_item *addrlist, host_item *host)
3868 {
3869 address_item *first_addr = NULL;
3870 address_item *addr;
3871 for (addr = addrlist; addr; addr = addr->next)
3872 if (addr->transport_return == DEFER)
3873 {
3874 if (!first_addr) first_addr = addr;
3875 addr->transport_return = PENDING_DEFER;
3876 addr->basic_errno = 0;
3877 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3878 addr->message = NULL;
3879 #ifdef SUPPORT_TLS
3880 addr->cipher = NULL;
3881 addr->ourcert = NULL;
3882 addr->peercert = NULL;
3883 addr->peerdn = NULL;
3884 addr->ocsp = OCSP_NOT_REQ;
3885 #endif
3886 #ifdef EXPERIMENTAL_DSN_INFO
3887 addr->smtp_greeting = NULL;
3888 addr->helo_response = NULL;
3889 #endif
3890 }
3891 return first_addr;
3892 }
3893
3894
3895
3896 /*************************************************
3897 * Main entry point *
3898 *************************************************/
3899
3900 /* See local README for interface details. As this is a remote transport, it is
3901 given a chain of addresses to be delivered in one connection, if possible. It
3902 always returns TRUE, indicating that each address has its own independent
3903 status set, except if there is a setting up problem, in which case it returns
3904 FALSE. */
3905
3906 BOOL
3907 smtp_transport_entry(
3908 transport_instance *tblock, /* data for this instantiation */
3909 address_item *addrlist) /* addresses we are working on */
3910 {
3911 int cutoff_retry;
3912 int defport;
3913 int hosts_defer = 0;
3914 int hosts_fail = 0;
3915 int hosts_looked_up = 0;
3916 int hosts_retry = 0;
3917 int hosts_serial = 0;
3918 int hosts_total = 0;
3919 int total_hosts_tried = 0;
3920 address_item *addr;
3921 BOOL expired = TRUE;
3922 uschar *expanded_hosts = NULL;
3923 uschar *pistring;
3924 uschar *tid = string_sprintf("%s transport", tblock->name);
3925 smtp_transport_options_block *ob =
3926 (smtp_transport_options_block *)(tblock->options_block);
3927 host_item *hostlist = addrlist->host_list;
3928 host_item *host;
3929
3930 DEBUG(D_transport)
3931 {
3932 debug_printf("%s transport entered\n", tblock->name);
3933 for (addr = addrlist; addr; addr = addr->next)
3934 debug_printf(" %s\n", addr->address);
3935 if (hostlist)
3936 {
3937 debug_printf("hostlist:\n");
3938 for (host = hostlist; host; host = host->next)
3939 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3940 }
3941 if (continue_hostname)
3942 debug_printf("already connected to %s [%s] (on fd %d)\n",
3943 continue_hostname, continue_host_address,
3944 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
3945 }
3946
3947 /* Set the flag requesting that these hosts be added to the waiting
3948 database if the delivery fails temporarily or if we are running with
3949 queue_smtp or a 2-stage queue run. This gets unset for certain
3950 kinds of error, typically those that are specific to the message. */
3951
3952 update_waiting = TRUE;
3953
3954 /* If a host list is not defined for the addresses - they must all have the
3955 same one in order to be passed to a single transport - or if the transport has
3956 a host list with hosts_override set, use the host list supplied with the
3957 transport. It is an error for this not to exist. */
3958
3959 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3960 if (tls_requiretls & REQUIRETLS_MSG)
3961 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
3962 rather than modifying the transport? */
3963 #endif
3964
3965 if (!hostlist || (ob->hosts_override && ob->hosts))
3966 {
3967 if (!ob->hosts)
3968 {
3969 addrlist->message = string_sprintf("%s transport called with no hosts set",
3970 tblock->name);
3971 addrlist->transport_return = PANIC;
3972 return FALSE; /* Only top address has status */
3973 }
3974
3975 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3976 ob->hosts);
3977
3978 /* If the transport's host list contains no '$' characters, and we are not
3979 randomizing, it is fixed and therefore a chain of hosts can be built once
3980 and for all, and remembered for subsequent use by other calls to this
3981 transport. If, on the other hand, the host list does contain '$', or we are
3982 randomizing its order, we have to rebuild it each time. In the fixed case,
3983 as the hosts string will never be used again, it doesn't matter that we
3984 replace all the : characters with zeros. */
3985
3986 if (!ob->hostlist)
3987 {
3988 uschar *s = ob->hosts;
3989
3990 if (Ustrchr(s, '$') != NULL)
3991 {
3992 if (!(expanded_hosts = expand_string(s)))
3993 {
3994 addrlist->message = string_sprintf("failed to expand list of hosts "
3995 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3996 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3997 return FALSE; /* Only top address has status */
3998 }
3999 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4000 "\"%s\"\n", s, expanded_hosts);
4001 s = expanded_hosts;
4002 }
4003 else
4004 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4005
4006 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4007
4008 /* Check that the expansion yielded something useful. */
4009 if (!hostlist)
4010 {
4011 addrlist->message =
4012 string_sprintf("%s transport has empty hosts setting", tblock->name);
4013 addrlist->transport_return = PANIC;
4014 return FALSE; /* Only top address has status */
4015 }
4016
4017 /* If there was no expansion of hosts, save the host list for
4018 next time. */
4019
4020 if (!expanded_hosts) ob->hostlist = hostlist;
4021 }
4022
4023 /* This is not the first time this transport has been run in this delivery;
4024 the host list was built previously. */
4025
4026 else
4027 hostlist = ob->hostlist;
4028 }
4029
4030 /* The host list was supplied with the address. If hosts_randomize is set, we
4031 must sort it into a random order if it did not come from MX records and has not
4032 already been randomized (but don't bother if continuing down an existing
4033 connection). */
4034
4035 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4036 {
4037 host_item *newlist = NULL;
4038 while (hostlist)
4039 {
4040 host_item *h = hostlist;
4041 hostlist = hostlist->next;
4042
4043 h->sort_key = random_number(100);
4044
4045 if (!newlist)
4046 {
4047 h->next = NULL;
4048 newlist = h;
4049 }
4050 else if (h->sort_key < newlist->sort_key)
4051 {
4052 h->next = newlist;
4053 newlist = h;
4054 }
4055 else
4056 {
4057 host_item *hh = newlist;
4058 while (hh->next)
4059 {
4060 if (h->sort_key < hh->next->sort_key) break;
4061 hh = hh->next;
4062 }
4063 h->next = hh->next;
4064 hh->next = h;
4065 }
4066 }
4067
4068 hostlist = addrlist->host_list = newlist;
4069 }
4070
4071 /* Sort out the default port. */
4072
4073 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4074
4075 /* For each host-plus-IP-address on the list:
4076
4077 . If this is a continued delivery and the host isn't the one with the
4078 current connection, skip.
4079
4080 . If the status is unusable (i.e. previously failed or retry checked), skip.
4081
4082 . If no IP address set, get the address, either by turning the name into
4083 an address, calling gethostbyname if gethostbyname is on, or by calling
4084 the DNS. The DNS may yield multiple addresses, in which case insert the
4085 extra ones into the list.
4086
4087 . Get the retry data if not previously obtained for this address and set the
4088 field which remembers the state of this address. Skip if the retry time is
4089 not reached. If not, remember whether retry data was found. The retry string
4090 contains both the name and the IP address.
4091
4092 . Scan the list of addresses and mark those whose status is DEFER as
4093 PENDING_DEFER. These are the only ones that will be processed in this cycle
4094 of the hosts loop.
4095
4096 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4097 Some addresses may be successfully delivered, others may fail, and yet
4098 others may get temporary errors and so get marked DEFER.
4099
4100 . The return from the delivery attempt is OK if a connection was made and a
4101 valid SMTP dialogue was completed. Otherwise it is DEFER.
4102
4103 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4104
4105 . If fail to connect, or other defer state, add a retry item.
4106
4107 . If there are any addresses whose status is still DEFER, carry on to the
4108 next host/IPaddress, unless we have tried the number of hosts given
4109 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4110 there is some fancy logic for hosts_max_try that means its limit can be
4111 overstepped in some circumstances.
4112
4113 If we get to the end of the list, all hosts have deferred at least one address,
4114 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4115 delivery attempt to those hosts whose last try was before the arrival time of
4116 the current message. To cope with this, we have to go round the loop a second
4117 time. After that, set the status and error data for any addresses that haven't
4118 had it set already. */
4119
4120 for (cutoff_retry = 0;
4121 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4122 cutoff_retry++)
4123 {
4124 host_item *nexthost = NULL;
4125 int unexpired_hosts_tried = 0;
4126 BOOL continue_host_tried = FALSE;
4127
4128 retry_non_continued:
4129 for (host = hostlist;
4130 host
4131 && unexpired_hosts_tried < ob->hosts_max_try
4132 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4133 host = nexthost)
4134 {
4135 int rc;
4136 int host_af;
4137 uschar *rs;
4138 BOOL host_is_expired = FALSE;
4139 BOOL message_defer = FALSE;
4140 BOOL some_deferred = FALSE;
4141 address_item *first_addr = NULL;
4142 uschar *interface = NULL;
4143 uschar *retry_host_key = NULL;
4144 uschar *retry_message_key = NULL;
4145 uschar *serialize_key = NULL;
4146
4147 /* Default next host is next host. :-) But this can vary if the
4148 hosts_max_try limit is hit (see below). It may also be reset if a host
4149 address is looked up here (in case the host was multihomed). */
4150
4151 nexthost = host->next;
4152
4153 /* If the address hasn't yet been obtained from the host name, look it up
4154 now, unless the host is already marked as unusable. If it is marked as
4155 unusable, it means that the router was unable to find its IP address (in
4156 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4157 the lookup failed last time. We don't get this far if *all* MX records
4158 point to non-existent hosts; that is treated as a hard error.
4159
4160 We can just skip this host entirely. When the hosts came from the router,
4161 the address will timeout based on the other host(s); when the address is
4162 looked up below, there is an explicit retry record added.
4163
4164 Note that we mustn't skip unusable hosts if the address is not unset; they
4165 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4166
4167 if (!host->address)
4168 {
4169 int new_port, flags;
4170 host_item *hh;
4171
4172 if (host->status >= hstatus_unusable)
4173 {
4174 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4175 host->name);
4176 continue;
4177 }
4178
4179 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4180
4181 /* The host name is permitted to have an attached port. Find it, and
4182 strip it from the name. Just remember it for now. */
4183
4184 new_port = host_item_get_port(host);
4185
4186 /* Count hosts looked up */
4187
4188 hosts_looked_up++;
4189
4190 /* Find by name if so configured, or if it's an IP address. We don't
4191 just copy the IP address, because we need the test-for-local to happen. */
4192
4193 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4194 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4195 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4196
4197 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4198 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4199 else
4200 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4201 &ob->dnssec, /* domains for request/require */
4202 NULL, NULL);
4203
4204 /* Update the host (and any additional blocks, resulting from
4205 multihoming) with a host-specific port, if any. */
4206
4207 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4208
4209 /* Failure to find the host at this time (usually DNS temporary failure)
4210 is really a kind of routing failure rather than a transport failure.
4211 Therefore we add a retry item of the routing kind, not to stop us trying
4212 to look this name up here again, but to ensure the address gets timed
4213 out if the failures go on long enough. A complete failure at this point
4214 commonly points to a configuration error, but the best action is still
4215 to carry on for the next host. */
4216
4217 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4218 {
4219 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4220 expired = FALSE;
4221 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4222 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4223 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4224 host->status = hstatus_unusable;
4225
4226 for (addr = addrlist; addr; addr = addr->next)
4227 {
4228 if (addr->transport_return != DEFER) continue;
4229 addr->basic_errno = ERRNO_UNKNOWNHOST;
4230 addr->message = string_sprintf(
4231 rc == HOST_FIND_SECURITY
4232 ? "lookup of IP address for %s was insecure"
4233 : "failed to lookup IP address for %s",
4234 host->name);
4235 }
4236 continue;
4237 }
4238
4239 /* If the host is actually the local host, we may have a problem, or
4240 there may be some cunning configuration going on. In the problem case,
4241 log things and give up. The default transport status is already DEFER. */
4242
4243 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4244 {
4245 for (addr = addrlist; addr; addr = addr->next)
4246 {
4247 addr->basic_errno = 0;
4248 addr->message = string_sprintf("%s transport found host %s to be "
4249 "local", tblock->name, host->name);
4250 }
4251 goto END_TRANSPORT;
4252 }
4253 } /* End of block for IP address lookup */
4254
4255 /* If this is a continued delivery, we are interested only in the host
4256 which matches the name of the existing open channel. The check is put
4257 here after the local host lookup, in case the name gets expanded as a
4258 result of the lookup. Set expired FALSE, to save the outer loop executing
4259 twice. */
4260
4261 if (continue_hostname)
4262 if ( Ustrcmp(continue_hostname, host->name) != 0
4263 || Ustrcmp(continue_host_address, host->address) != 0
4264 )
4265 {
4266 expired = FALSE;
4267 continue; /* With next host */
4268 }
4269 else
4270 continue_host_tried = TRUE;
4271
4272 /* Reset the default next host in case a multihomed host whose addresses
4273 are not looked up till just above added to the host list. */
4274
4275 nexthost = host->next;
4276
4277 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4278 domain is in queue_smtp_domains, we don't actually want to attempt any
4279 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4280 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4281 were not in it. We don't want to hold up all SMTP deliveries! Except when
4282 doing a two-stage queue run, don't do this if forcing. */
4283
4284 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4285 match_isinlist(addrlist->domain,
4286 (const uschar **)&queue_smtp_domains, 0,
4287 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4288 {
4289 expired = FALSE;
4290 for (addr = addrlist; addr; addr = addr->next)
4291 if (addr->transport_return == DEFER)
4292 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4293 continue; /* With next host */
4294 }
4295
4296 /* Count hosts being considered - purely for an intelligent comment
4297 if none are usable. */
4298
4299 hosts_total++;
4300
4301 /* Set $host and $host address now in case they are needed for the
4302 interface expansion or the serialize_hosts check; they remain set if an
4303 actual delivery happens. */
4304
4305 deliver_host = host->name;
4306 deliver_host_address = host->address;
4307 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4308 : host->dnssec == DS_NO ? US"no"
4309 : US"";
4310
4311 /* Set up a string for adding to the retry key if the port number is not
4312 the standard SMTP port. A host may have its own port setting that overrides
4313 the default. */
4314
4315 pistring = string_sprintf(":%d", host->port == PORT_NONE
4316 ? defport : host->port);
4317 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4318
4319 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4320 string is set, even if constant (as different transports can have different
4321 constant settings), we must add it to the key that is used for retries,
4322 because connections to the same host from a different interface should be
4323 treated separately. */
4324
4325 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4326 if ((rs = ob->interface) && *rs)
4327 {
4328 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4329 return FALSE;
4330 pistring = string_sprintf("%s/%s", pistring, interface);
4331 }
4332
4333 /* The first time round the outer loop, check the status of the host by
4334 inspecting the retry data. The second time round, we are interested only
4335 in expired hosts that haven't been tried since this message arrived. */
4336
4337 if (cutoff_retry == 0)
4338 {
4339 BOOL incl_ip;
4340 /* Ensure the status of the address is set by checking retry data if
4341 necessary. There may be host-specific retry data (applicable to all
4342 messages) and also data for retries of a specific message at this host.
4343 If either of these retry records are actually read, the keys used are
4344 returned to save recomputing them later. */
4345
4346 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4347 US"retry_include_ip_address", ob->retry_include_ip_address,
4348 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4349 continue; /* with next host */
4350
4351 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4352 incl_ip, &retry_host_key, &retry_message_key);
4353
4354 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4355 (host->address == NULL)? US"" : host->address, pistring,
4356 (host->status == hstatus_usable)? "usable" :
4357 (host->status == hstatus_unusable)? "unusable" :
4358 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4359
4360 /* Skip this address if not usable at this time, noting if it wasn't
4361 actually expired, both locally and in the address. */
4362
4363 switch (host->status)
4364 {
4365 case hstatus_unusable:
4366 expired = FALSE;
4367 setflag(addrlist, af_retry_skipped);
4368 /* Fall through */
4369
4370 case hstatus_unusable_expired:
4371 switch (host->why)
4372 {
4373 case hwhy_retry: hosts_retry++; break;
4374 case hwhy_failed: hosts_fail++; break;
4375 case hwhy_insecure:
4376 case hwhy_deferred: hosts_defer++; break;
4377 }
4378
4379 /* If there was a retry message key, implying that previously there
4380 was a message-specific defer, we don't want to update the list of
4381 messages waiting for these hosts. */
4382
4383 if (retry_message_key) update_waiting = FALSE;
4384 continue; /* With the next host or IP address */
4385 }
4386 }
4387
4388 /* Second time round the loop: if the address is set but expired, and
4389 the message is newer than the last try, let it through. */
4390
4391 else
4392 {
4393 if ( !host->address
4394 || host->status != hstatus_unusable_expired
4395 || host->last_try > received_time.tv_sec)
4396 continue;
4397 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4398 host->name, host->address, pistring);
4399 host_is_expired = TRUE;
4400 }
4401
4402 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4403 it remains TRUE only if all hosts are expired and none are actually tried.
4404 */
4405
4406 expired = FALSE;
4407
4408 /* If this host is listed as one to which access must be serialized,
4409 see if another Exim process has a connection to it, and if so, skip
4410 this host. If not, update the database to record our connection to it
4411 and remember this for later deletion. Do not do any of this if we are
4412 sending the message down a pre-existing connection. */
4413
4414 if ( !continue_hostname
4415 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4416 {
4417 serialize_key = string_sprintf("host-serialize-%s", host->name);
4418 if (!enq_start(serialize_key, 1))
4419 {
4420 DEBUG(D_transport)
4421 debug_printf("skipping host %s because another Exim process "
4422 "is connected to it\n", host->name);
4423 hosts_serial++;
4424 continue;
4425 }
4426 }
4427
4428 /* OK, we have an IP address that is not waiting for its retry time to
4429 arrive (it might be expired) OR (second time round the loop) we have an
4430 expired host that hasn't been tried since the message arrived. Have a go
4431 at delivering the message to it. First prepare the addresses by flushing
4432 out the result of previous attempts, and finding the first address that
4433 is still to be delivered. */
4434
4435 first_addr = prepare_addresses(addrlist, host);
4436
4437 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4438 message_id, host->name, host->address, addrlist->address,
4439 addrlist->next ? ", ..." : "");
4440
4441 set_process_info("delivering %s to %s [%s] (%s%s)",
4442 message_id, host->name, host->address, addrlist->address,
4443 addrlist->next ? ", ..." : "");
4444
4445 /* This is not for real; don't do the delivery. If there are
4446 any remaining hosts, list them. */
4447
4448 if (dont_deliver)
4449 {
4450 host_item *host2;
4451 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4452 for (addr = addrlist; addr; addr = addr->next)
4453 {
4454 addr->host_used = host;
4455 addr->special_action = '*';
4456 addr->message = US"delivery bypassed by -N option";
4457 }
4458 DEBUG(D_transport)
4459 {
4460 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4461 "*** host and remaining hosts:\n", tblock->name);
4462 for (host2 = host; host2; host2 = host2->next)
4463 debug_printf(" %s [%s]\n", host2->name,
4464 host2->address ? host2->address : US"unset");
4465 }
4466 rc = OK;
4467 }
4468
4469 /* This is for real. If the host is expired, we don't count it for
4470 hosts_max_retry. This ensures that all hosts must expire before an address
4471 is timed out, unless hosts_max_try_hardlimit (which protects against
4472 lunatic DNS configurations) is reached.
4473
4474 If the host is not expired and we are about to hit the hosts_max_retry
4475 limit, check to see if there is a subsequent hosts with a different MX
4476 value. If so, make that the next host, and don't count this one. This is a
4477 heuristic to make sure that different MXs do get tried. With a normal kind
4478 of retry rule, they would get tried anyway when the earlier hosts were
4479 delayed, but if the domain has a "retry every time" type of rule - as is
4480 often used for the the very large ISPs, that won't happen. */
4481
4482 else
4483 {
4484 host_item * thost;
4485 /* Make a copy of the host if it is local to this invocation
4486 of the transport. */
4487
4488 if (expanded_hosts)
4489 {
4490 thost = store_get(sizeof(host_item));
4491 *thost = *host;
4492 thost->name = string_copy(host->name);
4493 thost->address = string_copy(host->address);
4494 }
4495 else
4496 thost = host;
4497
4498 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4499 {
4500 host_item *h;
4501 DEBUG(D_transport)
4502 debug_printf("hosts_max_try limit reached with this host\n");
4503 for (h = host; h; h = h->next) if (h->mx != host->mx)
4504 {
4505 nexthost = h;
4506 unexpired_hosts_tried--;
4507 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4508 "and will be tried\n");
4509 break;
4510 }
4511 }
4512
4513 /* Attempt the delivery. */
4514
4515 total_hosts_tried++;
4516 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4517 &message_defer, FALSE);
4518
4519 /* Yield is one of:
4520 OK => connection made, each address contains its result;
4521 message_defer is set for message-specific defers (when all
4522 recipients are marked defer)
4523 DEFER => there was a non-message-specific delivery problem;
4524 ERROR => there was a problem setting up the arguments for a filter,
4525 or there was a problem with expanding added headers
4526 */
4527
4528 /* If the result is not OK, there was a non-message-specific problem.
4529 If the result is DEFER, we need to write to the logs saying what happened
4530 for this particular host, except in the case of authentication and TLS
4531 failures, where the log has already been written. If all hosts defer a
4532 general message is written at the end. */
4533
4534 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4535 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4536 write_logs(host, first_addr->message, first_addr->basic_errno);
4537
4538 #ifndef DISABLE_EVENT
4539 if (rc == DEFER)
4540 deferred_event_raise(first_addr, host);
4541 #endif
4542
4543 /* If STARTTLS was accepted, but there was a failure in setting up the
4544 TLS session (usually a certificate screwup), and the host is not in
4545 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4546 TLS forcibly turned off. We have to start from scratch with a new SMTP
4547 connection. That's why the retry is done from here, not from within
4548 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4549 session, so the in-clear transmission after those errors, if permitted,
4550 happens inside smtp_deliver().] */
4551
4552 #ifdef SUPPORT_TLS
4553 if ( rc == DEFER
4554 && first_addr->basic_errno == ERRNO_TLSFAILURE
4555 && ob->tls_tempfail_tryclear
4556 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4557 )
4558 {
4559 log_write(0, LOG_MAIN,
4560 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4561 first_addr->message, host->name, host->address);
4562 first_addr = prepare_addresses(addrlist, host);
4563 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4564 &message_defer, TRUE);
4565 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4566 write_logs(host, first_addr->message, first_addr->basic_errno);
4567 # ifndef DISABLE_EVENT
4568 if (rc == DEFER)
4569 deferred_event_raise(first_addr, host);
4570 # endif
4571 }
4572 #endif /*SUPPORT_TLS*/
4573 }
4574
4575 /* Delivery attempt finished */
4576
4577 rs = rc == OK ? US"OK"
4578 : rc == DEFER ? US"DEFER"
4579 : rc == ERROR ? US"ERROR"
4580 : US"?";
4581
4582 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4583 message_id, host->name, host->address, addrlist->address,
4584 addrlist->next ? " (& others)" : "", rs);
4585
4586 /* Release serialization if set up */
4587
4588 if (serialize_key) enq_end(serialize_key);
4589
4590 /* If the result is DEFER, or if a host retry record is known to exist, we
4591 need to add an item to the retry chain for updating the retry database
4592 at the end of delivery. We only need to add the item to the top address,
4593 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4594 for any other delivery attempts using the same address. (It is copied into
4595 the unusable tree at the outer level, so even if different address blocks
4596 contain the same address, it still won't get tried again.) */
4597
4598 if (rc == DEFER || retry_host_key)
4599 {
4600 int delete_flag = rc != DEFER ? rf_delete : 0;
4601 if (!retry_host_key)
4602 {
4603 BOOL incl_ip;
4604 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4605 US"retry_include_ip_address", ob->retry_include_ip_address,
4606 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4607 incl_ip = TRUE; /* error; use most-specific retry record */
4608
4609 retry_host_key = incl_ip
4610 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4611 : string_sprintf("T:%S%s", host->name, pistring);
4612 }
4613
4614 /* If a delivery of another message over an existing SMTP connection
4615 yields DEFER, we do NOT set up retry data for the host. This covers the
4616 case when there are delays in routing the addresses in the second message
4617 that are so long that the server times out. This is alleviated by not
4618 routing addresses that previously had routing defers when handling an
4619 existing connection, but even so, this case may occur (e.g. if a
4620 previously happily routed address starts giving routing defers). If the
4621 host is genuinely down, another non-continued message delivery will
4622 notice it soon enough. */
4623
4624 if (delete_flag != 0 || !continue_hostname)
4625 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4626
4627 /* We may have tried an expired host, if its retry time has come; ensure
4628 the status reflects the expiry for the benefit of any other addresses. */
4629
4630 if (rc == DEFER)
4631 {
4632 host->status = host_is_expired
4633 ? hstatus_unusable_expired : hstatus_unusable;
4634 host->why = hwhy_deferred;
4635 }
4636 }
4637
4638 /* If message_defer is set (host was OK, but every recipient got deferred
4639 because of some message-specific problem), or if that had happened
4640 previously so that a message retry key exists, add an appropriate item
4641 to the retry chain. Note that if there was a message defer but now there is
4642 a host defer, the message defer record gets deleted. That seems perfectly
4643 reasonable. Also, stop the message from being remembered as waiting
4644 for specific hosts. */
4645
4646 if (message_defer || retry_message_key)
4647 {
4648 int delete_flag = message_defer ? 0 : rf_delete;
4649 if (!retry_message_key)
4650 {
4651 BOOL incl_ip;
4652 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4653 US"retry_include_ip_address", ob->retry_include_ip_address,
4654 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4655 incl_ip = TRUE; /* error; use most-specific retry record */
4656
4657 retry_message_key = incl_ip
4658 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4659 message_id)
4660 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4661 }
4662 retry_add_item(addrlist, retry_message_key,
4663 rf_message | rf_host | delete_flag);
4664 update_waiting = FALSE;
4665 }
4666
4667 /* Any return other than DEFER (that is, OK or ERROR) means that the
4668 addresses have got their final statuses filled in for this host. In the OK
4669 case, see if any of them are deferred. */
4670
4671 if (rc == OK)
4672 for (addr = addrlist; addr; addr = addr->next)
4673 if (addr->transport_return == DEFER)
4674 {
4675 some_deferred = TRUE;
4676 break;
4677 }
4678
4679 /* If no addresses deferred or the result was ERROR, return. We do this for
4680 ERROR because a failing filter set-up or add_headers expansion is likely to
4681 fail for any host we try. */
4682
4683 if (rc == ERROR || (rc == OK && !some_deferred))
4684 {
4685 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4686 return TRUE; /* Each address has its status */
4687 }
4688
4689 /* If the result was DEFER or some individual addresses deferred, let
4690 the loop run to try other hosts with the deferred addresses, except for the
4691 case when we were trying to deliver down an existing channel and failed.
4692 Don't try any other hosts in this case. */
4693
4694 if (continue_hostname) break;
4695
4696 /* If the whole delivery, or some individual addresses, were deferred and
4697 there are more hosts that could be tried, do not count this host towards
4698 the hosts_max_try limit if the age of the message is greater than the
4699 maximum retry time for this host. This means we may try try all hosts,
4700 ignoring the limit, when messages have been around for some time. This is
4701 important because if we don't try all hosts, the address will never time
4702 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4703
4704 if ((rc == DEFER || some_deferred) && nexthost)
4705 {
4706 BOOL timedout;
4707 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4708
4709 if (retry && retry->rules)
4710 {
4711 retry_rule *last_rule;
4712 for (last_rule = retry->rules;
4713 last_rule->next;
4714 last_rule = last_rule->next);
4715 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4716 }
4717 else timedout = TRUE; /* No rule => timed out */
4718
4719 if (timedout)
4720 {
4721 unexpired_hosts_tried--;
4722 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4723 "hosts_max_try (message older than host's retry time)\n");
4724 }
4725 }
4726 } /* End of loop for trying multiple hosts. */
4727
4728 /* If we failed to find a matching host in the list, for an already-open
4729 connection, just close it and start over with the list. This can happen
4730 for routing that changes from run to run, or big multi-IP sites with
4731 round-robin DNS. */
4732
4733 if (continue_hostname && !continue_host_tried)
4734 {
4735 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
4736
4737 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4738 #ifdef SUPPORT_TLS
4739 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
4740 transport */
4741 /*XXX doublecheck that! */
4742
4743 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
4744 {
4745 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
4746 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4747 cutthrough.cctx.tls_ctx = NULL;
4748 cutthrough.is_tls = FALSE;
4749 }
4750 else
4751 #else
4752 (void) write(fd, US"QUIT\r\n", 6);
4753 #endif
4754 (void) close(fd);
4755 cutthrough.cctx.sock = -1;
4756 continue_hostname = NULL;
4757 goto retry_non_continued;
4758 }
4759
4760 /* This is the end of the loop that repeats iff expired is TRUE and
4761 ob->delay_after_cutoff is FALSE. The second time round we will
4762 try those hosts that haven't been tried since the message arrived. */
4763
4764 DEBUG(D_transport)
4765 {
4766 debug_printf("all IP addresses skipped or deferred at least one address\n");
4767 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4768 debug_printf("retrying IP addresses not tried since message arrived\n");
4769 }
4770 }
4771
4772
4773 /* Get here if all IP addresses are skipped or defer at least one address. In
4774 MUA wrapper mode, this will happen only for connection or other non-message-
4775 specific failures. Force the delivery status for all addresses to FAIL. */
4776
4777 if (mua_wrapper)
4778 {
4779 for (addr = addrlist; addr; addr = addr->next)
4780 addr->transport_return = FAIL;
4781 goto END_TRANSPORT;
4782 }
4783
4784 /* In the normal, non-wrapper case, add a standard message to each deferred
4785 address if there hasn't been an error, that is, if it hasn't actually been
4786 tried this time. The variable "expired" will be FALSE if any deliveries were
4787 actually tried, or if there was at least one host that was not expired. That
4788 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4789 a delivery has been tried, an error code will be set, and the failing of the
4790 message is handled by the retry code later.
4791
4792 If queue_smtp is set, or this transport was called to send a subsequent message
4793 down an existing TCP/IP connection, and something caused the host not to be
4794 found, we end up here, but can detect these cases and handle them specially. */
4795
4796 for (addr = addrlist; addr; addr = addr->next)
4797 {
4798 /* If host is not NULL, it means that we stopped processing the host list
4799 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4800 means we need to behave as if some hosts were skipped because their retry
4801 time had not come. Specifically, this prevents the address from timing out.
4802 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4803 hosts were tried. */
4804
4805 if (host)
4806 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4807 {
4808 DEBUG(D_transport)
4809 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4810 "hosts were tried\n");
4811 }
4812 else
4813 {
4814 DEBUG(D_transport)
4815 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4816 setflag(addr, af_retry_skipped);
4817 }
4818
4819 if (queue_smtp) /* no deliveries attempted */
4820 {
4821 addr->transport_return = DEFER;
4822 addr->basic_errno = 0;
4823 addr->message = US"SMTP delivery explicitly queued";
4824 }
4825
4826 else if ( addr->transport_return == DEFER
4827 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4828 && !addr->message
4829 )
4830 {
4831 addr->basic_errno = ERRNO_HRETRY;
4832 if (continue_hostname)
4833 addr->message = US"no host found for existing SMTP connection";
4834 else if (expired)
4835 {
4836 setflag(addr, af_pass_message); /* This is not a security risk */
4837 addr->message = string_sprintf(
4838 "all hosts%s have been failing for a long time %s",
4839 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4840 ob->delay_after_cutoff
4841 ? US"(and retry time not reached)"
4842 : US"and were last tried after this message arrived");
4843
4844 /* If we are already using fallback hosts, or there are no fallback hosts
4845 defined, convert the result to FAIL to cause a bounce. */
4846
4847 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4848 addr->transport_return = FAIL;
4849 }
4850 else
4851 {
4852 const char * s;
4853 if (hosts_retry == hosts_total)
4854 s = "retry time not reached for any host%s";
4855 else if (hosts_fail == hosts_total)
4856 s = "all host address lookups%s failed permanently";
4857 else if (hosts_defer == hosts_total)
4858 s = "all host address lookups%s failed temporarily";
4859 else if (hosts_serial == hosts_total)
4860 s = "connection limit reached for all hosts%s";
4861 else if (hosts_fail+hosts_defer == hosts_total)
4862 s = "all host address lookups%s failed";
4863 else
4864 s = "some host address lookups failed and retry time "
4865 "not reached for other hosts or connection limit reached%s";
4866
4867 addr->message = string_sprintf(s,
4868 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4869 }
4870 }
4871 }
4872
4873 /* Update the database which keeps information about which messages are waiting
4874 for which hosts to become available. For some message-specific errors, the
4875 update_waiting flag is turned off because we don't want follow-on deliveries in
4876 those cases. If this transport instance is explicitly limited to one message
4877 per connection then follow-on deliveries are not possible and there's no need
4878 to create/update the per-transport wait-<transport_name> database. */
4879
4880 if (update_waiting && tblock->connection_max_messages != 1)
4881 transport_update_waiting(hostlist, tblock->name);
4882
4883 END_TRANSPORT:
4884
4885 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4886
4887 return TRUE; /* Each address has its status */
4888 }
4889
4890 #endif /*!MACRO_PREDEF*/
4891 /* vi: aw ai sw=2
4892 */
4893 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.