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Testsuite: add missing testcase script
[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 #ifndef DISABLE_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 #ifndef DISABLE_TLS
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
106 #endif
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
112 #endif
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
118 #endif
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
121 #ifndef DISABLE_TLS
122 # ifdef SUPPORT_DANE
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
125 # endif
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
129 # endif
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
132 #endif
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
137 #ifdef SUPPORT_DANE
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
140 #endif
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
143 #ifndef DISABLE_PRDR
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
146 #endif
147 #ifndef DISABLE_TLS
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
150 #endif
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
171 #ifdef SUPPORT_SOCKS
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
174 #endif
175 #ifndef DISABLE_TLS
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 # ifdef EXPERIMENTAL_TLS_RESUME
187 { "tls_resumption_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
189 # endif
190 { "tls_sni", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_sni) },
192 { "tls_tempfail_tryclear", opt_bool,
193 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
194 { "tls_try_verify_hosts", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
196 { "tls_verify_cert_hostnames", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
198 { "tls_verify_certificates", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
200 { "tls_verify_hosts", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
202 #endif
203 #ifdef SUPPORT_I18N
204 { "utf8_downconvert", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
206 #endif
207 };
208
209 /* Size of the options list. An extern variable has to be used so that its
210 address can appear in the tables drtables.c. */
211
212 int smtp_transport_options_count = nelem(smtp_transport_options);
213
214
215 #ifdef MACRO_PREDEF
216
217 /* Dummy values */
218 smtp_transport_options_block smtp_transport_option_defaults = {0};
219 void smtp_transport_init(transport_instance *tblock) {}
220 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
221 void smtp_transport_closedown(transport_instance *tblock) {}
222
223 #else /*!MACRO_PREDEF*/
224
225
226 /* Default private options block for the smtp transport. */
227
228 smtp_transport_options_block smtp_transport_option_defaults = {
229 .hosts = NULL,
230 .fallback_hosts = NULL,
231 .hostlist = NULL,
232 .fallback_hostlist = NULL,
233 .helo_data = US"$primary_hostname",
234 .interface = NULL,
235 .port = NULL,
236 .protocol = US"smtp",
237 .dscp = NULL,
238 .serialize_hosts = NULL,
239 .hosts_try_auth = NULL,
240 .hosts_require_auth = NULL,
241 .hosts_try_chunking = US"*",
242 #ifdef SUPPORT_DANE
243 .hosts_try_dane = US"*",
244 .hosts_require_dane = NULL,
245 .dane_require_tls_ciphers = NULL,
246 #endif
247 .hosts_try_fastopen = US"*",
248 #ifndef DISABLE_PRDR
249 .hosts_try_prdr = US"*",
250 #endif
251 #ifndef DISABLE_OCSP
252 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
253 .hosts_require_ocsp = NULL,
254 #endif
255 .hosts_require_tls = NULL,
256 .hosts_avoid_tls = NULL,
257 .hosts_verify_avoid_tls = NULL,
258 .hosts_avoid_pipelining = NULL,
259 #ifdef EXPERIMENTAL_PIPE_CONNECT
260 .hosts_pipe_connect = NULL,
261 #endif
262 .hosts_avoid_esmtp = NULL,
263 #ifndef DISABLE_TLS
264 .hosts_nopass_tls = NULL,
265 .hosts_noproxy_tls = NULL,
266 #endif
267 .command_timeout = 5*60,
268 .connect_timeout = 5*60,
269 .data_timeout = 5*60,
270 .final_timeout = 10*60,
271 .size_addition = 1024,
272 .hosts_max_try = 5,
273 .hosts_max_try_hardlimit = 50,
274 .address_retry_include_sender = TRUE,
275 .allow_localhost = FALSE,
276 .authenticated_sender_force = FALSE,
277 .gethostbyname = FALSE,
278 .dns_qualify_single = TRUE,
279 .dns_search_parents = FALSE,
280 .dnssec = { .request=NULL, .require=NULL },
281 .delay_after_cutoff = TRUE,
282 .hosts_override = FALSE,
283 .hosts_randomize = FALSE,
284 .keepalive = TRUE,
285 .lmtp_ignore_quota = FALSE,
286 .expand_retry_include_ip_address = NULL,
287 .retry_include_ip_address = TRUE,
288 #ifdef SUPPORT_SOCKS
289 .socks_proxy = NULL,
290 #endif
291 #ifndef DISABLE_TLS
292 .tls_certificate = NULL,
293 .tls_crl = NULL,
294 .tls_privatekey = NULL,
295 .tls_require_ciphers = NULL,
296 .tls_sni = NULL,
297 .tls_verify_certificates = US"system",
298 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
299 .tls_tempfail_tryclear = TRUE,
300 # ifdef EXPERIMENTAL_TLS_RESUME
301 .tls_resumption_hosts = NULL,
302 # endif
303 .tls_verify_hosts = NULL,
304 .tls_try_verify_hosts = US"*",
305 .tls_verify_cert_hostnames = US"*",
306 #endif
307 #ifdef SUPPORT_I18N
308 .utf8_downconvert = NULL,
309 #endif
310 #ifndef DISABLE_DKIM
311 .dkim =
312 {.dkim_domain = NULL,
313 .dkim_identity = NULL,
314 .dkim_private_key = NULL,
315 .dkim_selector = NULL,
316 .dkim_canon = NULL,
317 .dkim_sign_headers = NULL,
318 .dkim_strict = NULL,
319 .dkim_hash = US"sha256",
320 .dkim_timestamps = NULL,
321 .dot_stuffed = FALSE,
322 .force_bodyhash = FALSE,
323 # ifdef EXPERIMENTAL_ARC
324 .arc_signspec = NULL,
325 # endif
326 },
327 # ifdef EXPERIMENTAL_ARC
328 .arc_sign = NULL,
329 # endif
330 #endif
331 };
332
333 /* some DSN flags for use later */
334
335 static int rf_list[] = {rf_notify_never, rf_notify_success,
336 rf_notify_failure, rf_notify_delay };
337
338 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
339
340
341
342 /* Local statics */
343
344 static uschar *smtp_command; /* Points to last cmd for error messages */
345 static uschar *mail_command; /* Points to MAIL cmd for error messages */
346 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
347 static BOOL update_waiting; /* TRUE to update the "wait" database */
348
349 /*XXX move to smtp_context */
350 static BOOL pipelining_active; /* current transaction is in pipe mode */
351
352
353 static unsigned ehlo_response(uschar * buf, unsigned checks);
354
355
356 /*************************************************
357 * Setup entry point *
358 *************************************************/
359
360 /* This function is called when the transport is about to be used,
361 but before running it in a sub-process. It is used for two things:
362
363 (1) To set the fallback host list in addresses, when delivering.
364 (2) To pass back the interface, port, protocol, and other options, for use
365 during callout verification.
366
367 Arguments:
368 tblock pointer to the transport instance block
369 addrlist list of addresses about to be transported
370 tf if not NULL, pointer to block in which to return options
371 uid the uid that will be set (not used)
372 gid the gid that will be set (not used)
373 errmsg place for error message (not used)
374
375 Returns: OK always (FAIL, DEFER not used)
376 */
377
378 static int
379 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
380 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
381 {
382 smtp_transport_options_block *ob = SOB tblock->options_block;
383
384 errmsg = errmsg; /* Keep picky compilers happy */
385 uid = uid;
386 gid = gid;
387
388 /* Pass back options if required. This interface is getting very messy. */
389
390 if (tf)
391 {
392 tf->interface = ob->interface;
393 tf->port = ob->port;
394 tf->protocol = ob->protocol;
395 tf->hosts = ob->hosts;
396 tf->hosts_override = ob->hosts_override;
397 tf->hosts_randomize = ob->hosts_randomize;
398 tf->gethostbyname = ob->gethostbyname;
399 tf->qualify_single = ob->dns_qualify_single;
400 tf->search_parents = ob->dns_search_parents;
401 tf->helo_data = ob->helo_data;
402 }
403
404 /* Set the fallback host list for all the addresses that don't have fallback
405 host lists, provided that the local host wasn't present in the original host
406 list. */
407
408 if (!testflag(addrlist, af_local_host_removed))
409 for (; addrlist; addrlist = addrlist->next)
410 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
411
412 return OK;
413 }
414
415
416
417 /*************************************************
418 * Initialization entry point *
419 *************************************************/
420
421 /* Called for each instance, after its options have been read, to
422 enable consistency checks to be done, or anything else that needs
423 to be set up.
424
425 Argument: pointer to the transport instance block
426 Returns: nothing
427 */
428
429 void
430 smtp_transport_init(transport_instance *tblock)
431 {
432 smtp_transport_options_block *ob = SOB tblock->options_block;
433
434 /* Retry_use_local_part defaults FALSE if unset */
435
436 if (tblock->retry_use_local_part == TRUE_UNSET)
437 tblock->retry_use_local_part = FALSE;
438
439 /* Set the default port according to the protocol */
440
441 if (!ob->port)
442 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
443 ? US"lmtp"
444 : strcmpic(ob->protocol, US"smtps") == 0
445 ? US"smtps" : US"smtp";
446
447 /* Set up the setup entry point, to be called before subprocesses for this
448 transport. */
449
450 tblock->setup = smtp_transport_setup;
451
452 /* Complain if any of the timeouts are zero. */
453
454 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
455 ob->final_timeout <= 0)
456 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
457 "command, data, or final timeout value is zero for %s transport",
458 tblock->name);
459
460 /* If hosts_override is set and there are local hosts, set the global
461 flag that stops verify from showing router hosts. */
462
463 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
464
465 /* If there are any fallback hosts listed, build a chain of host items
466 for them, but do not do any lookups at this time. */
467
468 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
469 }
470
471
472
473
474
475 /*************************************************
476 * Set delivery info into all active addresses *
477 *************************************************/
478
479 /* Only addresses whose status is >= PENDING are relevant. A lesser
480 status means that an address is not currently being processed.
481
482 Arguments:
483 addrlist points to a chain of addresses
484 errno_value to put in each address's errno field
485 msg to put in each address's message field
486 rc to put in each address's transport_return field
487 pass_message if TRUE, set the "pass message" flag in the address
488 host if set, mark addrs as having used this host
489 smtp_greeting from peer
490 helo_response from peer
491
492 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
493 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
494 this particular type of timeout.
495
496 Returns: nothing
497 */
498
499 static void
500 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message, host_item * host
502 #ifdef EXPERIMENTAL_DSN_INFO
503 , const uschar * smtp_greeting, const uschar * helo_response
504 #endif
505 )
506 {
507 int orvalue = 0;
508 if (errno_value == ERRNO_CONNECTTIMEOUT)
509 {
510 errno_value = ETIMEDOUT;
511 orvalue = RTEF_CTOUT;
512 }
513 for (address_item * addr = addrlist; addr; addr = addr->next)
514 if (addr->transport_return >= PENDING)
515 {
516 addr->basic_errno = errno_value;
517 addr->more_errno |= orvalue;
518 if (msg)
519 {
520 addr->message = msg;
521 if (pass_message) setflag(addr, af_pass_message);
522 }
523 addr->transport_return = rc;
524 if (host)
525 {
526 addr->host_used = host;
527 #ifdef EXPERIMENTAL_DSN_INFO
528 if (smtp_greeting)
529 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
530 addr->smtp_greeting = smtp_greeting;
531
532 if (helo_response)
533 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
534 addr->helo_response = helo_response;
535 #endif
536 }
537 }
538 }
539
540 static void
541 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
542 BOOL pass_message)
543 {
544 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
545 #ifdef EXPERIMENTAL_DSN_INFO
546 , NULL, NULL
547 #endif
548 );
549 }
550
551
552 /*************************************************
553 * Check an SMTP response *
554 *************************************************/
555
556 /* This function is given an errno code and the SMTP response buffer
557 to analyse, together with the host identification for generating messages. It
558 sets an appropriate message and puts the first digit of the response code into
559 the yield variable. If no response was actually read, a suitable digit is
560 chosen.
561
562 Arguments:
563 host the current host, to get its name for messages
564 errno_value pointer to the errno value
565 more_errno from the top address for use with ERRNO_FILTER_FAIL
566 buffer the SMTP response buffer
567 yield where to put a one-digit SMTP response code
568 message where to put an error message
569 pass_message set TRUE if message is an SMTP response
570
571 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
572 */
573
574 static BOOL
575 check_response(host_item *host, int *errno_value, int more_errno,
576 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
577 {
578 uschar * pl = pipelining_active ? US"pipelined " : US"";
579 const uschar * s;
580
581 *yield = '4'; /* Default setting is to give a temporary error */
582
583 switch(*errno_value)
584 {
585 case ETIMEDOUT: /* Handle response timeout */
586 *message = US string_sprintf("SMTP timeout after %s%s",
587 pl, smtp_command);
588 if (transport_count > 0)
589 *message = US string_sprintf("%s (%d bytes written)", *message,
590 transport_count);
591 return FALSE;
592
593 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
594 s = string_printing(buffer);
595 while (isspace(*s)) s++;
596 *message = *s == 0
597 ? string_sprintf("Malformed SMTP reply (an empty line) "
598 "in response to %s%s", pl, smtp_command)
599 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
600 pl, smtp_command, s);
601 return FALSE;
602
603 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
604 GnuTLS and TLS1.3 */
605 *message = US"bad first read from TLS conn";
606 return TRUE;
607
608 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
609 can't send QUIT as we mustn't end the DATA. */
610 *message = string_sprintf("transport filter process failed (%d)%s",
611 more_errno,
612 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
613 return FALSE;
614
615 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
616 can't send QUIT as we mustn't end the DATA. */
617 *message =
618 string_sprintf("failed to expand headers_add or headers_remove: %s",
619 expand_string_message);
620 return FALSE;
621
622 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
623 *message = string_sprintf("failed to write a data block");
624 return FALSE;
625
626 #ifdef SUPPORT_I18N
627 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
628 *message = US"utf8 support required but not offered for forwarding";
629 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
630 return TRUE;
631 #endif
632 }
633
634 /* Handle error responses from the remote mailer. */
635
636 if (buffer[0] != 0)
637 {
638 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
639 "%s", pl, smtp_command, s = string_printing(buffer));
640 *pass_message = TRUE;
641 *yield = buffer[0];
642 return TRUE;
643 }
644
645 /* No data was read. If there is no errno, this must be the EOF (i.e.
646 connection closed) case, which causes deferral. An explicit connection reset
647 error has the same effect. Otherwise, put the host's identity in the message,
648 leaving the errno value to be interpreted as well. In all cases, we have to
649 assume the connection is now dead. */
650
651 if (*errno_value == 0 || *errno_value == ECONNRESET)
652 {
653 *errno_value = ERRNO_SMTPCLOSED;
654 *message = US string_sprintf("Remote host closed connection "
655 "in response to %s%s", pl, smtp_command);
656 }
657 else
658 *message = US string_sprintf("%s [%s]", host->name, host->address);
659
660 return FALSE;
661 }
662
663
664
665 /*************************************************
666 * Write error message to logs *
667 *************************************************/
668
669 /* This writes to the main log and to the message log.
670
671 Arguments:
672 host the current host
673 detail the current message (addr_item->message)
674 basic_errno the errno (addr_item->basic_errno)
675
676 Returns: nothing
677 */
678
679 static void
680 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
681 {
682 gstring * message = LOGGING(outgoing_port)
683 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
684 host->port == PORT_NONE ? 25 : host->port)
685 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
686
687 if (suffix)
688 {
689 message = string_fmt_append(message, ": %s", suffix);
690 if (basic_errno > 0)
691 message = string_fmt_append(message, ": %s", strerror(basic_errno));
692 }
693 else
694 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
695
696 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
697 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
698 }
699
700 static void
701 msglog_line(host_item * host, uschar * message)
702 {
703 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
704 host->name, host->address, message);
705 }
706
707
708
709 #ifndef DISABLE_EVENT
710 /*************************************************
711 * Post-defer action *
712 *************************************************/
713
714 /* This expands an arbitrary per-transport string.
715 It might, for example, be used to write to the database log.
716
717 Arguments:
718 addr the address item containing error information
719 host the current host
720
721 Returns: nothing
722 */
723
724 static void
725 deferred_event_raise(address_item *addr, host_item *host)
726 {
727 uschar * action = addr->transport->event_action;
728 const uschar * save_domain;
729 uschar * save_local;
730
731 if (!action)
732 return;
733
734 save_domain = deliver_domain;
735 save_local = deliver_localpart;
736
737 /*XXX would ip & port already be set up? */
738 deliver_host_address = string_copy(host->address);
739 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
740 event_defer_errno = addr->basic_errno;
741
742 router_name = addr->router->name;
743 transport_name = addr->transport->name;
744 deliver_domain = addr->domain;
745 deliver_localpart = addr->local_part;
746
747 (void) event_raise(action, US"msg:host:defer",
748 addr->message
749 ? addr->basic_errno > 0
750 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
751 : string_copy(addr->message)
752 : addr->basic_errno > 0
753 ? string_copy(US strerror(addr->basic_errno))
754 : NULL);
755
756 deliver_localpart = save_local;
757 deliver_domain = save_domain;
758 router_name = transport_name = NULL;
759 }
760 #endif
761
762 /*************************************************
763 * Reap SMTP specific responses *
764 *************************************************/
765 static int
766 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
767 int count)
768 {
769 uschar flushbuffer[4096];
770
771 while (count-- > 0)
772 {
773 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
774 '2', ob->command_timeout)
775 && (errno != 0 || flushbuffer[0] == 0))
776 break;
777 }
778 return count;
779 }
780
781
782 /* Return boolean success */
783
784 static BOOL
785 smtp_reap_banner(smtp_context * sx)
786 {
787 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
788 '2', (SOB sx->conn_args.ob)->command_timeout);
789 #ifdef EXPERIMENTAL_DSN_INFO
790 sx->smtp_greeting = string_copy(sx->buffer);
791 #endif
792 return good_response;
793 }
794
795 static BOOL
796 smtp_reap_ehlo(smtp_context * sx)
797 {
798 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
799 (SOB sx->conn_args.ob)->command_timeout))
800 {
801 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
802 {
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
805 #endif
806 return FALSE;
807 }
808 sx->esmtp = FALSE;
809 }
810 #ifdef EXPERIMENTAL_DSN_INFO
811 sx->helo_response = string_copy(sx->buffer);
812 #endif
813 return TRUE;
814 }
815
816
817
818 #ifdef EXPERIMENTAL_PIPE_CONNECT
819 static uschar *
820 ehlo_cache_key(const smtp_context * sx)
821 {
822 host_item * host = sx->conn_args.host;
823 return Ustrchr(host->address, ':')
824 ? string_sprintf("[%s]:%d.EHLO", host->address,
825 host->port == PORT_NONE ? sx->port : host->port)
826 : string_sprintf("%s:%d.EHLO", host->address,
827 host->port == PORT_NONE ? sx->port : host->port);
828 }
829
830 static void
831 write_ehlo_cache_entry(const smtp_context * sx)
832 {
833 open_db dbblock, * dbm_file;
834
835 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
836 {
837 uschar * ehlo_resp_key = ehlo_cache_key(sx);
838 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
839
840 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
841 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
842 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
843
844 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
845 dbfn_close(dbm_file);
846 }
847 }
848
849 static void
850 invalidate_ehlo_cache_entry(smtp_context * sx)
851 {
852 open_db dbblock, * dbm_file;
853
854 if ( sx->early_pipe_active
855 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
856 {
857 uschar * ehlo_resp_key = ehlo_cache_key(sx);
858 dbfn_delete(dbm_file, ehlo_resp_key);
859 dbfn_close(dbm_file);
860 }
861 }
862
863 static BOOL
864 read_ehlo_cache_entry(smtp_context * sx)
865 {
866 open_db dbblock;
867 open_db * dbm_file;
868
869 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
870 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
871 else
872 {
873 uschar * ehlo_resp_key = ehlo_cache_key(sx);
874 dbdata_ehlo_resp * er;
875
876 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
877 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
878 else if (time(NULL) - er->time_stamp > retry_data_expire)
879 {
880 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
881 dbfn_close(dbm_file);
882 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
883 dbfn_delete(dbm_file, ehlo_resp_key);
884 }
885 else
886 {
887 sx->ehlo_resp = er->data;
888 dbfn_close(dbm_file);
889 DEBUG(D_transport) debug_printf(
890 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
891 er->data.cleartext_features, er->data.crypted_features);
892 return TRUE;
893 }
894 dbfn_close(dbm_file);
895 }
896 return FALSE;
897 }
898
899
900
901 /* Return an auths bitmap for the set of AUTH methods offered by the server
902 which match our authenticators. */
903
904 static unsigned short
905 study_ehlo_auths(smtp_context * sx)
906 {
907 uschar * names;
908 auth_instance * au;
909 uschar authnum;
910 unsigned short authbits = 0;
911
912 if (!sx->esmtp) return 0;
913 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
914 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
915 expand_nmax = -1; /* reset */
916 names = string_copyn(expand_nstring[1], expand_nlength[1]);
917
918 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
919 {
920 const uschar * list = names;
921 int sep = ' ';
922 uschar name[32];
923
924 while (string_nextinlist(&list, &sep, name, sizeof(name)))
925 if (strcmpic(au->public_name, name) == 0)
926 { authbits |= BIT(authnum); break; }
927 }
928
929 DEBUG(D_transport)
930 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
931 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
932
933 if (tls_out.active.sock >= 0)
934 sx->ehlo_resp.crypted_auths = authbits;
935 else
936 sx->ehlo_resp.cleartext_auths = authbits;
937 return authbits;
938 }
939
940
941
942
943 /* Wait for and check responses for early-pipelining.
944
945 Called from the lower-level smtp_read_response() function
946 used for general code that assume synchronisation, if context
947 flags indicate outstanding early-pipelining commands. Also
948 called fom sync_responses() which handles pipelined commands.
949
950 Arguments:
951 sx smtp connection context
952 countp number of outstanding responses, adjusted on return
953
954 Return:
955 OK all well
956 DEFER error on first read of TLS'd conn
957 FAIL SMTP error in response
958 */
959 int
960 smtp_reap_early_pipe(smtp_context * sx, int * countp)
961 {
962 BOOL pending_BANNER = sx->pending_BANNER;
963 BOOL pending_EHLO = sx->pending_EHLO;
964 int rc = FAIL;
965
966 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
967 sx->pending_EHLO = FALSE;
968
969 if (pending_BANNER)
970 {
971 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
972 (*countp)--;
973 if (!smtp_reap_banner(sx))
974 {
975 DEBUG(D_transport) debug_printf("bad banner\n");
976 if (tls_out.active.sock >= 0) rc = DEFER;
977 goto fail;
978 }
979 }
980
981 if (pending_EHLO)
982 {
983 unsigned peer_offered;
984 unsigned short authbits = 0, * ap;
985
986 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
987 (*countp)--;
988 if (!smtp_reap_ehlo(sx))
989 {
990 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
991 if (tls_out.active.sock >= 0) rc = DEFER;
992 goto fail;
993 }
994
995 /* Compare the actual EHLO response to the cached value we assumed;
996 on difference, dump or rewrite the cache and arrange for a retry. */
997
998 ap = tls_out.active.sock < 0
999 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1000
1001 peer_offered = ehlo_response(sx->buffer,
1002 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1003 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1004 | OPTION_UTF8 | OPTION_EARLY_PIPE
1005 );
1006 if ( peer_offered != sx->peer_offered
1007 || (authbits = study_ehlo_auths(sx)) != *ap)
1008 {
1009 HDEBUG(D_transport)
1010 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1011 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1012 sx->peer_offered, *ap, peer_offered, authbits);
1013 *(tls_out.active.sock < 0
1014 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1015 *ap = authbits;
1016 if (peer_offered & OPTION_EARLY_PIPE)
1017 write_ehlo_cache_entry(sx);
1018 else
1019 invalidate_ehlo_cache_entry(sx);
1020
1021 return OK; /* just carry on */
1022 }
1023 }
1024 return OK;
1025
1026 fail:
1027 invalidate_ehlo_cache_entry(sx);
1028 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1029 return rc;
1030 }
1031 #endif
1032
1033
1034 /*************************************************
1035 * Synchronize SMTP responses *
1036 *************************************************/
1037
1038 /* This function is called from smtp_deliver() to receive SMTP responses from
1039 the server, and match them up with the commands to which they relate. When
1040 PIPELINING is not in use, this function is called after every command, and is
1041 therefore somewhat over-engineered, but it is simpler to use a single scheme
1042 that works both with and without PIPELINING instead of having two separate sets
1043 of code.
1044
1045 The set of commands that are buffered up with pipelining may start with MAIL
1046 and may end with DATA; in between are RCPT commands that correspond to the
1047 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1048 etc.) are never buffered.
1049
1050 Errors after MAIL or DATA abort the whole process leaving the response in the
1051 buffer. After MAIL, pending responses are flushed, and the original command is
1052 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1053 permitted to reject some recipient addresses while accepting others. However
1054 certain errors clearly abort the whole process. Set the value in
1055 transport_return to PENDING_OK if the address is accepted. If there is a
1056 subsequent general error, it will get reset accordingly. If not, it will get
1057 converted to OK at the end.
1058
1059 Arguments:
1060 sx smtp connection context
1061 count the number of responses to read
1062 pending_DATA 0 if last command sent was not DATA
1063 +1 if previously had a good recipient
1064 -1 if not previously had a good recipient
1065
1066 Returns: 3 if at least one address had 2xx and one had 5xx
1067 2 if at least one address had 5xx but none had 2xx
1068 1 if at least one host had a 2xx response, but none had 5xx
1069 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1070 -1 timeout while reading RCPT response
1071 -2 I/O or other non-response error for RCPT
1072 -3 DATA or MAIL failed - errno and buffer set
1073 -4 banner or EHLO failed (early-pipelining)
1074 -5 banner or EHLO failed (early-pipelining, TLS)
1075 */
1076
1077 static int
1078 sync_responses(smtp_context * sx, int count, int pending_DATA)
1079 {
1080 address_item * addr = sx->sync_addr;
1081 smtp_transport_options_block * ob = sx->conn_args.ob;
1082 int yield = 0;
1083
1084 #ifdef EXPERIMENTAL_PIPE_CONNECT
1085 int rc;
1086 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1087 return rc == FAIL ? -4 : -5;
1088 #endif
1089
1090 /* Handle the response for a MAIL command. On error, reinstate the original
1091 command in big_buffer for error message use, and flush any further pending
1092 responses before returning, except after I/O errors and timeouts. */
1093
1094 if (sx->pending_MAIL)
1095 {
1096 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1097 count--;
1098 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1099 '2', ob->command_timeout))
1100 {
1101 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1102 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1103 if (errno == ERRNO_TLSFAILURE)
1104 return -5;
1105 if (errno == 0 && sx->buffer[0] != 0)
1106 {
1107 int save_errno = 0;
1108 if (sx->buffer[0] == '4')
1109 {
1110 save_errno = ERRNO_MAIL4XX;
1111 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1112 }
1113 count = smtp_discard_responses(sx, ob, count);
1114 errno = save_errno;
1115 }
1116
1117 if (pending_DATA) count--; /* Number of RCPT responses to come */
1118 while (count-- > 0) /* Mark any pending addrs with the host used */
1119 {
1120 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1121 addr->host_used = sx->conn_args.host;
1122 addr = addr->next;
1123 }
1124 return -3;
1125 }
1126 }
1127
1128 if (pending_DATA) count--; /* Number of RCPT responses to come */
1129
1130 /* Read and handle the required number of RCPT responses, matching each one up
1131 with an address by scanning for the next address whose status is PENDING_DEFER.
1132 */
1133
1134 while (count-- > 0)
1135 {
1136 while (addr->transport_return != PENDING_DEFER)
1137 if (!(addr = addr->next))
1138 return -2;
1139
1140 /* The address was accepted */
1141 addr->host_used = sx->conn_args.host;
1142
1143 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1144 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1145 '2', ob->command_timeout))
1146 {
1147 yield |= 1;
1148 addr->transport_return = PENDING_OK;
1149
1150 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1151 ensure that any address-specific retry record is expunged. We do this both
1152 for the basic key and for the version that also includes the sender. */
1153
1154 if (testflag(addr, af_dr_retry_exists))
1155 {
1156 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1157 sender_address);
1158 retry_add_item(addr, altkey, rf_delete);
1159 retry_add_item(addr, addr->address_retry_key, rf_delete);
1160 }
1161 }
1162
1163 /* Error on first TLS read */
1164
1165 else if (errno == ERRNO_TLSFAILURE)
1166 return -5;
1167
1168 /* Timeout while reading the response */
1169
1170 else if (errno == ETIMEDOUT)
1171 {
1172 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1173 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1174 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1175 retry_add_item(addr, addr->address_retry_key, 0);
1176 update_waiting = FALSE;
1177 return -1;
1178 }
1179
1180 /* Handle other errors in obtaining an SMTP response by returning -1. This
1181 will cause all the addresses to be deferred. Restore the SMTP command in
1182 big_buffer for which we are checking the response, so the error message
1183 makes sense. */
1184
1185 else if (errno != 0 || sx->buffer[0] == 0)
1186 {
1187 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1188 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1189 return -2;
1190 }
1191
1192 /* Handle SMTP permanent and temporary response codes. */
1193
1194 else
1195 {
1196 addr->message =
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1201 if (!sx->verify)
1202 msglog_line(sx->conn_args.host, addr->message);
1203
1204 /* The response was 5xx */
1205
1206 if (sx->buffer[0] == '5')
1207 {
1208 addr->transport_return = FAIL;
1209 yield |= 2;
1210 }
1211
1212 /* The response was 4xx */
1213
1214 else
1215 {
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1219
1220 if (!sx->verify)
1221 {
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1225 #endif
1226
1227 /* Log temporary errors if there are more hosts to be tried.
1228 If not, log this last one in the == line. */
1229
1230 if (sx->conn_args.host->next)
1231 if (LOGGING(outgoing_port))
1232 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1233 sx->conn_args.host->address,
1234 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1235 else
1236 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1237 sx->conn_args.host->address, addr->message);
1238
1239 #ifndef DISABLE_EVENT
1240 else
1241 msg_event_raise(US"msg:rcpt:defer", addr);
1242 #endif
1243
1244 /* Do not put this message on the list of those waiting for specific
1245 hosts, as otherwise it is likely to be tried too often. */
1246
1247 update_waiting = FALSE;
1248
1249 /* Add a retry item for the address so that it doesn't get tried again
1250 too soon. If address_retry_include_sender is true, add the sender address
1251 to the retry key. */
1252
1253 retry_add_item(addr,
1254 ob->address_retry_include_sender
1255 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1256 : addr->address_retry_key,
1257 0);
1258 }
1259 }
1260 }
1261 } /* Loop for next RCPT response */
1262
1263 /* Update where to start at for the next block of responses, unless we
1264 have already handled all the addresses. */
1265
1266 if (addr) sx->sync_addr = addr->next;
1267
1268 /* Handle a response to DATA. If we have not had any good recipients, either
1269 previously or in this block, the response is ignored. */
1270
1271 if (pending_DATA != 0)
1272 {
1273 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1274 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1275 '3', ob->command_timeout))
1276 {
1277 int code;
1278 uschar *msg;
1279 BOOL pass_message;
1280
1281 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1282 return -5;
1283
1284 if (pending_DATA > 0 || (yield & 1) != 0)
1285 {
1286 if (errno == 0 && sx->buffer[0] == '4')
1287 {
1288 errno = ERRNO_DATA4XX;
1289 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1290 }
1291 return -3;
1292 }
1293 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1294 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1295 "is in use and there were no good recipients\n", msg);
1296 }
1297 }
1298
1299 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1300 present) received 3xx. If any RCPTs were handled and yielded anything other
1301 than 4xx, yield will be set non-zero. */
1302
1303 return yield;
1304 }
1305
1306
1307
1308
1309
1310 /* Try an authenticator's client entry */
1311
1312 static int
1313 try_authenticator(smtp_context * sx, auth_instance * au)
1314 {
1315 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1316 host_item * host = sx->conn_args.host; /* host to deliver to */
1317 int rc;
1318
1319 sx->outblock.authenticating = TRUE;
1320 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1321 sx->buffer, sizeof(sx->buffer));
1322 sx->outblock.authenticating = FALSE;
1323 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1324
1325 /* A temporary authentication failure must hold up delivery to
1326 this host. After a permanent authentication failure, we carry on
1327 to try other authentication methods. If all fail hard, try to
1328 deliver the message unauthenticated unless require_auth was set. */
1329
1330 switch(rc)
1331 {
1332 case OK:
1333 f.smtp_authenticated = TRUE; /* stops the outer loop */
1334 client_authenticator = au->name;
1335 if (au->set_client_id)
1336 client_authenticated_id = expand_string(au->set_client_id);
1337 break;
1338
1339 /* Failure after writing a command */
1340
1341 case FAIL_SEND:
1342 return FAIL_SEND;
1343
1344 /* Failure after reading a response */
1345
1346 case FAIL:
1347 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1348 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1349 au->name, host->name, host->address, sx->buffer);
1350 break;
1351
1352 /* Failure by some other means. In effect, the authenticator
1353 decided it wasn't prepared to handle this case. Typically this
1354 is the result of "fail" in an expansion string. Do we need to
1355 log anything here? Feb 2006: a message is now put in the buffer
1356 if logging is required. */
1357
1358 case CANCELLED:
1359 if (*sx->buffer != 0)
1360 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1361 "authentication H=%s [%s] %s", au->name, host->name,
1362 host->address, sx->buffer);
1363 break;
1364
1365 /* Internal problem, message in buffer. */
1366
1367 case ERROR:
1368 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1369 DEFER, FALSE);
1370 return ERROR;
1371 }
1372 return OK;
1373 }
1374
1375
1376
1377
1378 /* Do the client side of smtp-level authentication.
1379
1380 Arguments:
1381 sx smtp connection context
1382
1383 sx->buffer should have the EHLO response from server (gets overwritten)
1384
1385 Returns:
1386 OK Success, or failed (but not required): global "smtp_authenticated" set
1387 DEFER Failed authentication (and was required)
1388 ERROR Internal problem
1389
1390 FAIL_SEND Failed communications - transmit
1391 FAIL - response
1392 */
1393
1394 static int
1395 smtp_auth(smtp_context * sx)
1396 {
1397 host_item * host = sx->conn_args.host; /* host to deliver to */
1398 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1399 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1400 #ifdef EXPERIMENTAL_PIPE_CONNECT
1401 unsigned short authbits = tls_out.active.sock >= 0
1402 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1403 #endif
1404 uschar * fail_reason = US"server did not advertise AUTH support";
1405
1406 f.smtp_authenticated = FALSE;
1407 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1408
1409 if (!regex_AUTH)
1410 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1411
1412 /* Is the server offering AUTH? */
1413
1414 if ( sx->esmtp
1415 &&
1416 #ifdef EXPERIMENTAL_PIPE_CONNECT
1417 sx->early_pipe_active ? authbits
1418 :
1419 #endif
1420 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1421 )
1422 {
1423 uschar * names = NULL;
1424 expand_nmax = -1; /* reset */
1425
1426 #ifdef EXPERIMENTAL_PIPE_CONNECT
1427 if (!sx->early_pipe_active)
1428 #endif
1429 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1430
1431 /* Must not do this check until after we have saved the result of the
1432 regex match above as the check could be another RE. */
1433
1434 if ( require_auth == OK
1435 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1436 {
1437 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1438 fail_reason = US"no common mechanisms were found";
1439
1440 #ifdef EXPERIMENTAL_PIPE_CONNECT
1441 if (sx->early_pipe_active)
1442 {
1443 /* Scan our authenticators (which support use by a client and were offered
1444 by the server (checked at cache-write time)), not suppressed by
1445 client_condition. If one is found, attempt to authenticate by calling its
1446 client function. We are limited to supporting up to 16 authenticator
1447 public-names by the number of bits in a short. */
1448
1449 auth_instance * au;
1450 uschar bitnum;
1451 int rc;
1452
1453 for (bitnum = 0, au = auths;
1454 !f.smtp_authenticated && au && bitnum < 16;
1455 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1456 {
1457 if ( au->client_condition
1458 && !expand_check_condition(au->client_condition, au->name,
1459 US"client authenticator"))
1460 {
1461 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1462 au->name, "client_condition is false");
1463 continue;
1464 }
1465
1466 /* Found data for a listed mechanism. Call its client entry. Set
1467 a flag in the outblock so that data is overwritten after sending so
1468 that reflections don't show it. */
1469
1470 fail_reason = US"authentication attempt(s) failed";
1471
1472 if ((rc = try_authenticator(sx, au)) != OK)
1473 return rc;
1474 }
1475 }
1476 else
1477 #endif
1478
1479 /* Scan the configured authenticators looking for one which is configured
1480 for use as a client, which is not suppressed by client_condition, and
1481 whose name matches an authentication mechanism supported by the server.
1482 If one is found, attempt to authenticate by calling its client function.
1483 */
1484
1485 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1486 {
1487 uschar *p = names;
1488
1489 if ( !au->client
1490 || ( au->client_condition
1491 && !expand_check_condition(au->client_condition, au->name,
1492 US"client authenticator")))
1493 {
1494 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1495 au->name,
1496 (au->client)? "client_condition is false" :
1497 "not configured as a client");
1498 continue;
1499 }
1500
1501 /* Loop to scan supported server mechanisms */
1502
1503 while (*p)
1504 {
1505 int len = Ustrlen(au->public_name);
1506 int rc;
1507
1508 while (isspace(*p)) p++;
1509
1510 if (strncmpic(au->public_name, p, len) != 0 ||
1511 (p[len] != 0 && !isspace(p[len])))
1512 {
1513 while (*p != 0 && !isspace(*p)) p++;
1514 continue;
1515 }
1516
1517 /* Found data for a listed mechanism. Call its client entry. Set
1518 a flag in the outblock so that data is overwritten after sending so
1519 that reflections don't show it. */
1520
1521 fail_reason = US"authentication attempt(s) failed";
1522
1523 if ((rc = try_authenticator(sx, au)) != OK)
1524 return rc;
1525
1526 break; /* If not authenticated, try next authenticator */
1527 } /* Loop for scanning supported server mechanisms */
1528 } /* Loop for further authenticators */
1529 }
1530 }
1531
1532 /* If we haven't authenticated, but are required to, give up. */
1533
1534 if (require_auth == OK && !f.smtp_authenticated)
1535 {
1536 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1537 string_sprintf("authentication required but %s", fail_reason), DEFER,
1538 FALSE);
1539 return DEFER;
1540 }
1541
1542 return OK;
1543 }
1544
1545
1546 /* Construct AUTH appendix string for MAIL TO */
1547 /*
1548 Arguments
1549 buffer to build string
1550 addrlist chain of potential addresses to deliver
1551 ob transport options
1552
1553 Globals f.smtp_authenticated
1554 client_authenticated_sender
1555 Return True on error, otherwise buffer has (possibly empty) terminated string
1556 */
1557
1558 BOOL
1559 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1560 smtp_transport_options_block *ob)
1561 {
1562 uschar *local_authenticated_sender = authenticated_sender;
1563
1564 #ifdef notdef
1565 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1566 #endif
1567
1568 if (ob->authenticated_sender != NULL)
1569 {
1570 uschar *new = expand_string(ob->authenticated_sender);
1571 if (new == NULL)
1572 {
1573 if (!f.expand_string_forcedfail)
1574 {
1575 uschar *message = string_sprintf("failed to expand "
1576 "authenticated_sender: %s", expand_string_message);
1577 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1578 return TRUE;
1579 }
1580 }
1581 else if (new[0] != 0) local_authenticated_sender = new;
1582 }
1583
1584 /* Add the authenticated sender address if present */
1585
1586 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1587 local_authenticated_sender != NULL)
1588 {
1589 string_format(buffer, bufsize, " AUTH=%s",
1590 auth_xtextencode(local_authenticated_sender,
1591 Ustrlen(local_authenticated_sender)));
1592 client_authenticated_sender = string_copy(local_authenticated_sender);
1593 }
1594 else
1595 *buffer= 0;
1596
1597 return FALSE;
1598 }
1599
1600
1601
1602 #ifdef SUPPORT_DANE
1603 /* Lookup TLSA record for host/port.
1604 Return: OK success with dnssec; DANE mode
1605 DEFER Do not use this host now, may retry later
1606 FAIL_FORCED No TLSA record; DANE not usable
1607 FAIL Do not use this connection
1608 */
1609
1610 int
1611 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1612 {
1613 /* move this out to host.c given the similarity to dns_lookup() ? */
1614 uschar buffer[300];
1615 const uschar * fullname = buffer;
1616 int rc;
1617 BOOL sec;
1618
1619 /* TLSA lookup string */
1620 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1621
1622 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1623 sec = dns_is_secure(dnsa);
1624 DEBUG(D_transport)
1625 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1626
1627 switch (rc)
1628 {
1629 case DNS_AGAIN:
1630 return DEFER; /* just defer this TLS'd conn */
1631
1632 case DNS_SUCCEED:
1633 if (sec)
1634 {
1635 DEBUG(D_transport)
1636 {
1637 dns_scan dnss;
1638 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1639 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1640 if (rr->type == T_TLSA && rr->size > 3)
1641 {
1642 uint16_t payload_length = rr->size - 3;
1643 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1644
1645 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1646 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1647 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1648 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1649 sp += sprintf(CS sp, "%02x", *p++);
1650
1651 debug_printf(" %s\n", s);
1652 }
1653 }
1654 return OK;
1655 }
1656 log_write(0, LOG_MAIN,
1657 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1658 /*FALLTRHOUGH*/
1659
1660 case DNS_NODATA: /* no TLSA RR for this lookup */
1661 case DNS_NOMATCH: /* no records at all for this lookup */
1662 return dane_required ? FAIL : FAIL_FORCED;
1663
1664 default:
1665 case DNS_FAIL:
1666 return dane_required ? FAIL : DEFER;
1667 }
1668 }
1669 #endif
1670
1671
1672
1673 typedef struct smtp_compare_s
1674 {
1675 uschar *current_sender_address;
1676 struct transport_instance *tblock;
1677 } smtp_compare_t;
1678
1679
1680 /* Create a unique string that identifies this message, it is based on
1681 sender_address, helo_data and tls_certificate if enabled.
1682 */
1683
1684 static uschar *
1685 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1686 {
1687 address_item * addr1;
1688 uschar * if1 = US"";
1689 uschar * helo1 = US"";
1690 #ifndef DISABLE_TLS
1691 uschar * tlsc1 = US"";
1692 #endif
1693 uschar * save_sender_address = sender_address;
1694 uschar * local_identity = NULL;
1695 smtp_transport_options_block * ob = SOB tblock->options_block;
1696
1697 sender_address = sender;
1698
1699 addr1 = deliver_make_addr (sender, TRUE);
1700 deliver_set_expansions(addr1);
1701
1702 if (ob->interface)
1703 if1 = expand_string(ob->interface);
1704
1705 if (ob->helo_data)
1706 helo1 = expand_string(ob->helo_data);
1707
1708 #ifndef DISABLE_TLS
1709 if (ob->tls_certificate)
1710 tlsc1 = expand_string(ob->tls_certificate);
1711 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1712 #else
1713 local_identity = string_sprintf ("%s^%s", if1, helo1);
1714 #endif
1715
1716 deliver_set_expansions(NULL);
1717 sender_address = save_sender_address;
1718
1719 return local_identity;
1720 }
1721
1722
1723
1724 /* This routine is a callback that is called from transport_check_waiting.
1725 This function will evaluate the incoming message versus the previous
1726 message. If the incoming message is using a different local identity then
1727 we will veto this new message. */
1728
1729 static BOOL
1730 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1731 {
1732 uschar * message_local_identity,
1733 * current_local_identity,
1734 * new_sender_address;
1735
1736 current_local_identity =
1737 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1738
1739 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1740 return 0;
1741
1742 message_local_identity =
1743 smtp_local_identity(new_sender_address, s_compare->tblock);
1744
1745 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1746 }
1747
1748
1749
1750 static unsigned
1751 ehlo_response(uschar * buf, unsigned checks)
1752 {
1753 size_t bsize = Ustrlen(buf);
1754
1755 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1756
1757 #ifndef DISABLE_TLS
1758 if ( checks & OPTION_TLS
1759 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1760 #endif
1761 checks &= ~OPTION_TLS;
1762
1763 if ( checks & OPTION_IGNQ
1764 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1765 PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_IGNQ;
1767
1768 if ( checks & OPTION_CHUNKING
1769 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1770 checks &= ~OPTION_CHUNKING;
1771
1772 #ifndef DISABLE_PRDR
1773 if ( checks & OPTION_PRDR
1774 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1775 #endif
1776 checks &= ~OPTION_PRDR;
1777
1778 #ifdef SUPPORT_I18N
1779 if ( checks & OPTION_UTF8
1780 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1781 #endif
1782 checks &= ~OPTION_UTF8;
1783
1784 if ( checks & OPTION_DSN
1785 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1786 checks &= ~OPTION_DSN;
1787
1788 if ( checks & OPTION_PIPE
1789 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1790 PCRE_EOPT, NULL, 0) < 0)
1791 checks &= ~OPTION_PIPE;
1792
1793 if ( checks & OPTION_SIZE
1794 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1795 checks &= ~OPTION_SIZE;
1796
1797 #ifdef EXPERIMENTAL_PIPE_CONNECT
1798 if ( checks & OPTION_EARLY_PIPE
1799 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1800 PCRE_EOPT, NULL, 0) < 0)
1801 #endif
1802 checks &= ~OPTION_EARLY_PIPE;
1803
1804 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1805 return checks;
1806 }
1807
1808
1809
1810 /* Callback for emitting a BDAT data chunk header.
1811
1812 If given a nonzero size, first flush any buffered SMTP commands
1813 then emit the command.
1814
1815 Reap previous SMTP command responses if requested, and always reap
1816 the response from a previous BDAT command.
1817
1818 Args:
1819 tctx transport context
1820 chunk_size value for SMTP BDAT command
1821 flags
1822 tc_chunk_last add LAST option to SMTP BDAT command
1823 tc_reap_prev reap response to previous SMTP commands
1824
1825 Returns:
1826 OK or ERROR
1827 DEFER TLS error on first read (EHLO-resp); errno set
1828 */
1829
1830 static int
1831 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1832 unsigned flags)
1833 {
1834 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1835 smtp_context * sx = tctx->smtp_context;
1836 int cmd_count = 0;
1837 int prev_cmd_count;
1838
1839 /* Write SMTP chunk header command. If not reaping responses, note that
1840 there may be more writes (like, the chunk data) done soon. */
1841
1842 if (chunk_size > 0)
1843 {
1844 #ifdef EXPERIMENTAL_PIPE_CONNECT
1845 BOOL new_conn = !!(sx->outblock.conn_args);
1846 #endif
1847 if((cmd_count = smtp_write_command(sx,
1848 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1849 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1850 ) < 0) return ERROR;
1851 if (flags & tc_chunk_last)
1852 data_command = string_copy(big_buffer); /* Save for later error message */
1853 #ifdef EXPERIMENTAL_PIPE_CONNECT
1854 /* That command write could have been the one that made the connection.
1855 Copy the fd from the client conn ctx (smtp transport specific) to the
1856 generic transport ctx. */
1857
1858 if (new_conn)
1859 tctx->u.fd = sx->outblock.cctx->sock;
1860 #endif
1861 }
1862
1863 prev_cmd_count = cmd_count += sx->cmd_count;
1864
1865 /* Reap responses for any previous, but not one we just emitted */
1866
1867 if (chunk_size > 0)
1868 prev_cmd_count--;
1869 if (sx->pending_BDAT)
1870 prev_cmd_count--;
1871
1872 if (flags & tc_reap_prev && prev_cmd_count > 0)
1873 {
1874 DEBUG(D_transport) debug_printf("look for %d responses"
1875 " for previous pipelined cmds\n", prev_cmd_count);
1876
1877 switch(sync_responses(sx, prev_cmd_count, 0))
1878 {
1879 case 1: /* 2xx (only) => OK */
1880 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1881 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1882 case 0: break; /* No 2xx or 5xx, but no probs */
1883
1884 case -5: errno = ERRNO_TLSFAILURE;
1885 return DEFER;
1886 #ifdef EXPERIMENTAL_PIPE_CONNECT
1887 case -4: /* non-2xx for pipelined banner or EHLO */
1888 #endif
1889 case -1: /* Timeout on RCPT */
1890 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1891 }
1892 cmd_count = 1;
1893 if (!sx->pending_BDAT)
1894 pipelining_active = FALSE;
1895 }
1896
1897 /* Reap response for an outstanding BDAT */
1898
1899 if (sx->pending_BDAT)
1900 {
1901 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1902
1903 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1904 ob->command_timeout))
1905 {
1906 if (errno == 0 && sx->buffer[0] == '4')
1907 {
1908 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1909 sx->addrlist->more_errno |=
1910 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1911 }
1912 return ERROR;
1913 }
1914 cmd_count--;
1915 sx->pending_BDAT = FALSE;
1916 pipelining_active = FALSE;
1917 }
1918 else if (chunk_size > 0)
1919 sx->pending_BDAT = TRUE;
1920
1921
1922 sx->cmd_count = cmd_count;
1923 return OK;
1924 }
1925
1926
1927
1928
1929
1930 /*************************************************
1931 * Make connection for given message *
1932 *************************************************/
1933
1934 /*
1935 Arguments:
1936 ctx connection context
1937 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1938 a second attempt after TLS initialization fails
1939
1940 Returns: OK - the connection was made and the delivery attempted;
1941 fd is set in the conn context, tls_out set up.
1942 DEFER - the connection could not be made, or something failed
1943 while setting up the SMTP session, or there was a
1944 non-message-specific error, such as a timeout.
1945 ERROR - helo_data or add_headers or authenticated_sender is
1946 specified for this transport, and the string failed
1947 to expand
1948 */
1949 int
1950 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1951 {
1952 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1953 BOOL pass_message = FALSE;
1954 uschar * message = NULL;
1955 int yield = OK;
1956 int rc;
1957 #ifndef DISABLE_TLS
1958 uschar * tls_errstr;
1959 #endif
1960
1961 sx->conn_args.ob = ob;
1962
1963 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1964 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1965 sx->ok = FALSE;
1966 sx->send_rset = TRUE;
1967 sx->send_quit = TRUE;
1968 sx->setting_up = TRUE;
1969 sx->esmtp = TRUE;
1970 sx->esmtp_sent = FALSE;
1971 #ifdef SUPPORT_I18N
1972 sx->utf8_needed = FALSE;
1973 #endif
1974 sx->dsn_all_lasthop = TRUE;
1975 #ifdef SUPPORT_DANE
1976 sx->conn_args.dane = FALSE;
1977 sx->dane_required =
1978 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1979 #endif
1980 #ifdef EXPERIMENTAL_PIPE_CONNECT
1981 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1982 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1983 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1984 #endif
1985
1986 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1987 sx->peer_offered = 0;
1988 sx->avoid_option = 0;
1989 sx->igquotstr = US"";
1990 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1991 #ifdef EXPERIMENTAL_DSN_INFO
1992 sx->smtp_greeting = NULL;
1993 sx->helo_response = NULL;
1994 #endif
1995
1996 smtp_command = US"initial connection";
1997 sx->buffer[0] = '\0';
1998
1999 /* Set up the buffer for reading SMTP response packets. */
2000
2001 sx->inblock.buffer = sx->inbuffer;
2002 sx->inblock.buffersize = sizeof(sx->inbuffer);
2003 sx->inblock.ptr = sx->inbuffer;
2004 sx->inblock.ptrend = sx->inbuffer;
2005
2006 /* Set up the buffer for holding SMTP commands while pipelining */
2007
2008 sx->outblock.buffer = sx->outbuffer;
2009 sx->outblock.buffersize = sizeof(sx->outbuffer);
2010 sx->outblock.ptr = sx->outbuffer;
2011 sx->outblock.cmd_count = 0;
2012 sx->outblock.authenticating = FALSE;
2013 sx->outblock.conn_args = NULL;
2014
2015 /* Reset the parameters of a TLS session. */
2016
2017 tls_out.bits = 0;
2018 tls_out.cipher = NULL; /* the one we may use for this transport */
2019 tls_out.ourcert = NULL;
2020 tls_out.peercert = NULL;
2021 tls_out.peerdn = NULL;
2022 #ifdef USE_OPENSSL
2023 tls_out.sni = NULL;
2024 #endif
2025 tls_out.ocsp = OCSP_NOT_REQ;
2026 #ifdef EXPERIMENTAL_TLS_RESUME
2027 tls_out.resumption = 0;
2028 #endif
2029
2030 /* Flip the legacy TLS-related variables over to the outbound set in case
2031 they're used in the context of the transport. Don't bother resetting
2032 afterward (when being used by a transport) as we're in a subprocess.
2033 For verify, unflipped once the callout is dealt with */
2034
2035 tls_modify_variables(&tls_out);
2036
2037 #ifdef DISABLE_TLS
2038 if (sx->smtps)
2039 {
2040 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2041 DEFER, FALSE);
2042 return ERROR;
2043 }
2044 #endif
2045
2046 /* Make a connection to the host if this isn't a continued delivery, and handle
2047 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2048 specially so they can be identified for retries. */
2049
2050 if (!continue_hostname)
2051 {
2052 if (sx->verify)
2053 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2054
2055 /* Get the actual port the connection will use, into sx->conn_args.host */
2056
2057 smtp_port_for_connect(sx->conn_args.host, sx->port);
2058
2059 #ifdef SUPPORT_DANE
2060 /* Do TLSA lookup for DANE */
2061 {
2062 tls_out.dane_verified = FALSE;
2063 tls_out.tlsa_usage = 0;
2064
2065 if (sx->conn_args.host->dnssec == DS_YES)
2066 {
2067 if( sx->dane_required
2068 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2069 )
2070 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2071 {
2072 case OK: sx->conn_args.dane = TRUE;
2073 ob->tls_tempfail_tryclear = FALSE;
2074 break;
2075 case FAIL_FORCED: break;
2076 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2077 string_sprintf("DANE error: tlsa lookup %s",
2078 rc_to_string(rc)),
2079 rc, FALSE);
2080 # ifndef DISABLE_EVENT
2081 (void) event_raise(sx->conn_args.tblock->event_action,
2082 US"dane:fail", sx->dane_required
2083 ? US"dane-required" : US"dnssec-invalid");
2084 # endif
2085 return rc;
2086 }
2087 }
2088 else if (sx->dane_required)
2089 {
2090 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2091 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2092 FAIL, FALSE);
2093 # ifndef DISABLE_EVENT
2094 (void) event_raise(sx->conn_args.tblock->event_action,
2095 US"dane:fail", US"dane-required");
2096 # endif
2097 return FAIL;
2098 }
2099 }
2100 #endif /*DANE*/
2101
2102 /* Make the TCP connection */
2103
2104 sx->cctx.tls_ctx = NULL;
2105 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2106 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2107
2108 #ifdef EXPERIMENTAL_PIPE_CONNECT
2109 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2110 {
2111 sx->early_pipe_ok = TRUE;
2112 if ( read_ehlo_cache_entry(sx)
2113 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2114 {
2115 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2116 sx->early_pipe_active = TRUE;
2117 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2118 }
2119 }
2120
2121 if (sx->early_pipe_active)
2122 sx->outblock.conn_args = &sx->conn_args;
2123 else
2124 #endif
2125 {
2126 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2127 {
2128 set_errno_nohost(sx->addrlist,
2129 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2130 sx->verify ? US strerror(errno) : NULL,
2131 DEFER, FALSE);
2132 sx->send_quit = FALSE;
2133 return DEFER;
2134 }
2135 }
2136 /* Expand the greeting message while waiting for the initial response. (Makes
2137 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2138 delayed till here so that $sending_interface and $sending_port are set. */
2139 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2140 will be? Somehow I doubt it. */
2141
2142 if (sx->helo_data)
2143 if (!(sx->helo_data = expand_string(sx->helo_data)))
2144 if (sx->verify)
2145 log_write(0, LOG_MAIN|LOG_PANIC,
2146 "<%s>: failed to expand transport's helo_data value for callout: %s",
2147 sx->addrlist->address, expand_string_message);
2148
2149 #ifdef SUPPORT_I18N
2150 if (sx->helo_data)
2151 {
2152 expand_string_message = NULL;
2153 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2154 &expand_string_message)),
2155 expand_string_message)
2156 if (sx->verify)
2157 log_write(0, LOG_MAIN|LOG_PANIC,
2158 "<%s>: failed to expand transport's helo_data value for callout: %s",
2159 sx->addrlist->address, expand_string_message);
2160 else
2161 sx->helo_data = NULL;
2162 }
2163 #endif
2164
2165 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2166 is nevertheless a reasonably clean way of programming this kind of logic,
2167 where you want to escape on any error. */
2168
2169 if (!sx->smtps)
2170 {
2171 #ifdef EXPERIMENTAL_PIPE_CONNECT
2172 if (sx->early_pipe_active)
2173 {
2174 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2175 sx->outblock.cmd_count = 1;
2176 }
2177 else
2178 #endif
2179 {
2180 #ifdef TCP_QUICKACK
2181 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2182 sizeof(off));
2183 #endif
2184 if (!smtp_reap_banner(sx))
2185 goto RESPONSE_FAILED;
2186 }
2187
2188 #ifndef DISABLE_EVENT
2189 {
2190 uschar * s;
2191 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2192 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2193 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2194 if (s)
2195 {
2196 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2197 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2198 DEFER, FALSE);
2199 yield = DEFER;
2200 goto SEND_QUIT;
2201 }
2202 }
2203 #endif
2204
2205 /* Now check if the helo_data expansion went well, and sign off cleanly if
2206 it didn't. */
2207
2208 if (!sx->helo_data)
2209 {
2210 message = string_sprintf("failed to expand helo_data: %s",
2211 expand_string_message);
2212 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2213 yield = DEFER;
2214 goto SEND_QUIT;
2215 }
2216 }
2217
2218 /** Debugging without sending a message
2219 sx->addrlist->transport_return = DEFER;
2220 goto SEND_QUIT;
2221 **/
2222
2223 /* Errors that occur after this point follow an SMTP command, which is
2224 left in big_buffer by smtp_write_command() for use in error messages. */
2225
2226 smtp_command = big_buffer;
2227
2228 /* Tell the remote who we are...
2229
2230 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2231 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2232 greeting is of this form. The assumption was that the far end supports it
2233 properly... but experience shows that there are some that give 5xx responses,
2234 even though the banner includes "ESMTP" (there's a bloody-minded one that
2235 says "ESMTP not spoken here"). Cope with that case.
2236
2237 September 2000: Time has passed, and it seems reasonable now to always send
2238 EHLO at the start. It is also convenient to make the change while installing
2239 the TLS stuff.
2240
2241 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2242 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2243 would be no way to send out the mails, so there is now a host list
2244 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2245 PIPELINING problem as well. Maybe it can also be useful to cure other
2246 problems with broken servers.
2247
2248 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2249 Then somebody tried it with a Microsoft mailer... It seems that all other
2250 mailers use upper case for some reason (the RFC is quite clear about case
2251 independence) so, for peace of mind, I gave in. */
2252
2253 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2254
2255 /* Alas; be careful, since this goto is not an error-out, so conceivably
2256 we might set data between here and the target which we assume to exist
2257 and be usable. I can see this coming back to bite us. */
2258 #ifndef DISABLE_TLS
2259 if (sx->smtps)
2260 {
2261 smtp_peer_options |= OPTION_TLS;
2262 suppress_tls = FALSE;
2263 ob->tls_tempfail_tryclear = FALSE;
2264 smtp_command = US"SSL-on-connect";
2265 goto TLS_NEGOTIATE;
2266 }
2267 #endif
2268
2269 if (sx->esmtp)
2270 {
2271 if (smtp_write_command(sx,
2272 #ifdef EXPERIMENTAL_PIPE_CONNECT
2273 sx->early_pipe_active ? SCMD_BUFFER :
2274 #endif
2275 SCMD_FLUSH,
2276 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2277 goto SEND_FAILED;
2278 sx->esmtp_sent = TRUE;
2279
2280 #ifdef EXPERIMENTAL_PIPE_CONNECT
2281 if (sx->early_pipe_active)
2282 {
2283 sx->pending_EHLO = TRUE;
2284
2285 /* If we have too many authenticators to handle and might need to AUTH
2286 for this transport, pipeline no further as we will need the
2287 list of auth methods offered. Reap the banner and EHLO. */
2288
2289 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2290 && f.smtp_in_early_pipe_no_auth)
2291 {
2292 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2293 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2294 goto SEND_FAILED;
2295 if (sync_responses(sx, 2, 0) != 0)
2296 {
2297 HDEBUG(D_transport)
2298 debug_printf("failed reaping pipelined cmd responses\n");
2299 goto RESPONSE_FAILED;
2300 }
2301 sx->early_pipe_active = FALSE;
2302 }
2303 }
2304 else
2305 #endif
2306 if (!smtp_reap_ehlo(sx))
2307 goto RESPONSE_FAILED;
2308 }
2309 else
2310 DEBUG(D_transport)
2311 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2312
2313 #ifdef EXPERIMENTAL_PIPE_CONNECT
2314 if (!sx->early_pipe_active)
2315 #endif
2316 if (!sx->esmtp)
2317 {
2318 BOOL good_response;
2319 int n = sizeof(sx->buffer);
2320 uschar * rsp = sx->buffer;
2321
2322 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2323 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2324
2325 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2326 goto SEND_FAILED;
2327 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2328 #ifdef EXPERIMENTAL_DSN_INFO
2329 sx->helo_response = string_copy(rsp);
2330 #endif
2331 if (!good_response)
2332 {
2333 /* Handle special logging for a closed connection after HELO
2334 when had previously sent EHLO */
2335
2336 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2337 {
2338 errno = ERRNO_SMTPCLOSED;
2339 goto EHLOHELO_FAILED;
2340 }
2341 memmove(sx->buffer, rsp, Ustrlen(rsp));
2342 goto RESPONSE_FAILED;
2343 }
2344 }
2345
2346 if (sx->esmtp || sx->lmtp)
2347 {
2348 #ifdef EXPERIMENTAL_PIPE_CONNECT
2349 if (!sx->early_pipe_active)
2350 #endif
2351 {
2352 sx->peer_offered = ehlo_response(sx->buffer,
2353 OPTION_TLS /* others checked later */
2354 #ifdef EXPERIMENTAL_PIPE_CONNECT
2355 | (sx->early_pipe_ok
2356 ? OPTION_IGNQ
2357 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2358 #ifdef SUPPORT_I18N
2359 | OPTION_UTF8
2360 #endif
2361 | OPTION_EARLY_PIPE
2362 : 0
2363 )
2364 #endif
2365 );
2366 #ifdef EXPERIMENTAL_PIPE_CONNECT
2367 if (sx->early_pipe_ok)
2368 {
2369 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2370
2371 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2372 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2373 {
2374 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2375 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2376 write_ehlo_cache_entry(sx);
2377 }
2378 }
2379 #endif
2380 }
2381
2382 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2383
2384 #ifndef DISABLE_TLS
2385 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2386 #endif
2387 }
2388 }
2389
2390 /* For continuing deliveries down the same channel, having re-exec'd the socket
2391 is the standard input; for a socket held open from verify it is recorded
2392 in the cutthrough context block. Either way we don't need to redo EHLO here
2393 (but may need to do so for TLS - see below).
2394 Set up the pointer to where subsequent commands will be left, for
2395 error messages. Note that smtp_peer_options will have been
2396 set from the command line if they were set in the process that passed the
2397 connection on. */
2398
2399 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2400 as the continue goes via transport_pass_socket() and doublefork and exec.
2401 It does not wait. Unclear how we keep separate host's responses
2402 separate - we could match up by host ip+port as a bodge. */
2403
2404 else
2405 {
2406 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2407 {
2408 sx->cctx = cutthrough.cctx;
2409 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2410 }
2411 else
2412 {
2413 sx->cctx.sock = 0; /* stdin */
2414 sx->cctx.tls_ctx = NULL;
2415 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2416 }
2417 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2418 smtp_command = big_buffer;
2419 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2420
2421 /* For a continued connection with TLS being proxied for us, or a
2422 held-open verify connection with TLS, nothing more to do. */
2423
2424 if ( continue_proxy_cipher
2425 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2426 && cutthrough.is_tls)
2427 )
2428 {
2429 sx->peer_offered = smtp_peer_options;
2430 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2431 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2432 continue_proxy_cipher ? "proxied" : "verify conn with");
2433 return OK;
2434 }
2435 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2436 }
2437
2438 /* If TLS is available on this connection, whether continued or not, attempt to
2439 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2440 send another EHLO - the server may give a different answer in secure mode. We
2441 use a separate buffer for reading the response to STARTTLS so that if it is
2442 negative, the original EHLO data is available for subsequent analysis, should
2443 the client not be required to use TLS. If the response is bad, copy the buffer
2444 for error analysis. */
2445
2446 #ifndef DISABLE_TLS
2447 if ( smtp_peer_options & OPTION_TLS
2448 && !suppress_tls
2449 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2450 && ( !sx->verify
2451 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2452 ) )
2453 {
2454 uschar buffer2[4096];
2455
2456 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2457 goto SEND_FAILED;
2458
2459 #ifdef EXPERIMENTAL_PIPE_CONNECT
2460 /* If doing early-pipelining reap the banner and EHLO-response but leave
2461 the response for the STARTTLS we just sent alone. */
2462
2463 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2464 {
2465 HDEBUG(D_transport)
2466 debug_printf("failed reaping pipelined cmd responses\n");
2467 goto RESPONSE_FAILED;
2468 }
2469 #endif
2470
2471 /* If there is an I/O error, transmission of this message is deferred. If
2472 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2473 false, we also defer. However, if there is a temporary rejection of STARTTLS
2474 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2475 STARTTLS, we carry on. This means we will try to send the message in clear,
2476 unless the host is in hosts_require_tls (tested below). */
2477
2478 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2479 {
2480 if ( errno != 0
2481 || buffer2[0] == 0
2482 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2483 )
2484 {
2485 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2486 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2487 goto RESPONSE_FAILED;
2488 }
2489 }
2490
2491 /* STARTTLS accepted: try to negotiate a TLS session. */
2492
2493 else
2494 TLS_NEGOTIATE:
2495 {
2496 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2497 {
2498 /* TLS negotiation failed; give an error. From outside, this function may
2499 be called again to try in clear on a new connection, if the options permit
2500 it for this host. */
2501 #ifdef USE_GNUTLS
2502 GNUTLS_CONN_FAILED:
2503 #endif
2504 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2505
2506 # ifdef SUPPORT_DANE
2507 if (sx->conn_args.dane)
2508 {
2509 log_write(0, LOG_MAIN,
2510 "DANE attempt failed; TLS connection to %s [%s]: %s",
2511 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2512 # ifndef DISABLE_EVENT
2513 (void) event_raise(sx->conn_args.tblock->event_action,
2514 US"dane:fail", US"validation-failure"); /* could do with better detail */
2515 # endif
2516 }
2517 # endif
2518
2519 errno = ERRNO_TLSFAILURE;
2520 message = string_sprintf("TLS session: %s", tls_errstr);
2521 sx->send_quit = FALSE;
2522 goto TLS_FAILED;
2523 }
2524
2525 /* TLS session is set up */
2526
2527 smtp_peer_options_wrap = smtp_peer_options;
2528 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2529 if (addr->transport_return == PENDING_DEFER)
2530 {
2531 addr->cipher = tls_out.cipher;
2532 addr->ourcert = tls_out.ourcert;
2533 addr->peercert = tls_out.peercert;
2534 addr->peerdn = tls_out.peerdn;
2535 addr->ocsp = tls_out.ocsp;
2536 }
2537 }
2538 }
2539
2540 /* if smtps, we'll have smtp_command set to something else; always safe to
2541 reset it here. */
2542 smtp_command = big_buffer;
2543
2544 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2545 helo_data is null, we are dealing with a connection that was passed from
2546 another process, and so we won't have expanded helo_data above. We have to
2547 expand it here. $sending_ip_address and $sending_port are set up right at the
2548 start of the Exim process (in exim.c). */
2549
2550 if (tls_out.active.sock >= 0)
2551 {
2552 uschar * greeting_cmd;
2553
2554 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2555 {
2556 uschar *message = string_sprintf("failed to expand helo_data: %s",
2557 expand_string_message);
2558 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2559 yield = DEFER;
2560 goto SEND_QUIT;
2561 }
2562
2563 #ifdef EXPERIMENTAL_PIPE_CONNECT
2564 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2565 We're unlikely to get the group sent and delivered before the server sends its
2566 banner, but it's still worth sending as a group.
2567 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2568 the reverse. */
2569
2570 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2571 {
2572 sx->peer_offered = sx->ehlo_resp.crypted_features;
2573 if ((sx->early_pipe_active =
2574 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2575 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2576 }
2577 #endif
2578
2579 /* For SMTPS we need to wait for the initial OK response. */
2580 if (sx->smtps)
2581 #ifdef EXPERIMENTAL_PIPE_CONNECT
2582 if (sx->early_pipe_active)
2583 {
2584 sx->pending_BANNER = TRUE;
2585 sx->outblock.cmd_count = 1;
2586 }
2587 else
2588 #endif
2589 if (!smtp_reap_banner(sx))
2590 goto RESPONSE_FAILED;
2591
2592 if (sx->lmtp)
2593 greeting_cmd = US"LHLO";
2594 else if (sx->esmtp)
2595 greeting_cmd = US"EHLO";
2596 else
2597 {
2598 greeting_cmd = US"HELO";
2599 DEBUG(D_transport)
2600 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2601 }
2602
2603 if (smtp_write_command(sx,
2604 #ifdef EXPERIMENTAL_PIPE_CONNECT
2605 sx->early_pipe_active ? SCMD_BUFFER :
2606 #endif
2607 SCMD_FLUSH,
2608 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2609 goto SEND_FAILED;
2610
2611 #ifdef EXPERIMENTAL_PIPE_CONNECT
2612 if (sx->early_pipe_active)
2613 sx->pending_EHLO = TRUE;
2614 else
2615 #endif
2616 {
2617 if (!smtp_reap_ehlo(sx))
2618 #ifdef USE_GNUTLS
2619 {
2620 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2621 cert late, under TLS1.3 - which means here; the first time we try to
2622 receive crypted data. Treat it as if it was a connect-time failure.
2623 See also the early-pipe equivalent... which will be hard; every call
2624 to sync_responses will need to check the result.
2625 It would be nicer to have GnuTLS check the cert during the handshake.
2626 Can it do that, with all the flexibility we need? */
2627
2628 tls_errstr = US"error on first read";
2629 goto GNUTLS_CONN_FAILED;
2630 }
2631 #else
2632 goto RESPONSE_FAILED;
2633 #endif
2634 smtp_peer_options = 0;
2635 }
2636 }
2637
2638 /* If the host is required to use a secure channel, ensure that we
2639 have one. */
2640
2641 else if ( sx->smtps
2642 # ifdef SUPPORT_DANE
2643 || sx->conn_args.dane
2644 # endif
2645 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2646 )
2647 {
2648 errno = ERRNO_TLSREQUIRED;
2649 message = string_sprintf("a TLS session is required, but %s",
2650 smtp_peer_options & OPTION_TLS
2651 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2652 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2653 if (sx->conn_args.dane)
2654 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2655 smtp_peer_options & OPTION_TLS
2656 ? US"validation-failure" /* could do with better detail */
2657 : US"starttls-not-supported");
2658 # endif
2659 goto TLS_FAILED;
2660 }
2661 #endif /*DISABLE_TLS*/
2662
2663 /* If TLS is active, we have just started it up and re-done the EHLO command,
2664 so its response needs to be analyzed. If TLS is not active and this is a
2665 continued session down a previously-used socket, we haven't just done EHLO, so
2666 we skip this. */
2667
2668 if (continue_hostname == NULL
2669 #ifndef DISABLE_TLS
2670 || tls_out.active.sock >= 0
2671 #endif
2672 )
2673 {
2674 if (sx->esmtp || sx->lmtp)
2675 {
2676 #ifdef EXPERIMENTAL_PIPE_CONNECT
2677 if (!sx->early_pipe_active)
2678 #endif
2679 {
2680 sx->peer_offered = ehlo_response(sx->buffer,
2681 0 /* no TLS */
2682 #ifdef EXPERIMENTAL_PIPE_CONNECT
2683 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2684 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2685 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2686 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2687
2688 #else
2689
2690 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2691 | OPTION_CHUNKING
2692 | OPTION_PRDR
2693 # ifdef SUPPORT_I18N
2694 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2695 /*XXX if we hand peercaps on to continued-conn processes,
2696 must not depend on this addr */
2697 # endif
2698 | OPTION_DSN
2699 | OPTION_PIPE
2700 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2701 #endif
2702 );
2703 #ifdef EXPERIMENTAL_PIPE_CONNECT
2704 if (tls_out.active.sock >= 0)
2705 sx->ehlo_resp.crypted_features = sx->peer_offered;
2706 #endif
2707 }
2708
2709 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2710 lmtp_ignore_quota option was set. */
2711
2712 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2713
2714 /* If the response to EHLO specified support for the SIZE parameter, note
2715 this, provided size_addition is non-negative. */
2716
2717 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2718
2719 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2720 the current host, esmtp will be false, so PIPELINING can never be used. If
2721 the current host matches hosts_avoid_pipelining, don't do it. */
2722
2723 if ( sx->peer_offered & OPTION_PIPE
2724 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2725 smtp_peer_options |= OPTION_PIPE;
2726
2727 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2728 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2729
2730 if ( sx->peer_offered & OPTION_CHUNKING
2731 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2732 sx->peer_offered &= ~OPTION_CHUNKING;
2733
2734 if (sx->peer_offered & OPTION_CHUNKING)
2735 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2736
2737 #ifndef DISABLE_PRDR
2738 if ( sx->peer_offered & OPTION_PRDR
2739 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2740 sx->peer_offered &= ~OPTION_PRDR;
2741
2742 if (sx->peer_offered & OPTION_PRDR)
2743 DEBUG(D_transport) debug_printf("PRDR usable\n");
2744 #endif
2745
2746 /* Note if the server supports DSN */
2747 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2748 DEBUG(D_transport) debug_printf("%susing DSN\n",
2749 sx->peer_offered & OPTION_DSN ? "" : "not ");
2750
2751 #ifdef EXPERIMENTAL_PIPE_CONNECT
2752 if ( sx->early_pipe_ok
2753 && !sx->early_pipe_active
2754 && tls_out.active.sock >= 0
2755 && smtp_peer_options & OPTION_PIPE
2756 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2757 & OPTION_EARLY_PIPE)
2758 {
2759 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2760 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2761 write_ehlo_cache_entry(sx);
2762 }
2763 #endif
2764
2765 /* Note if the response to EHLO specifies support for the AUTH extension.
2766 If it has, check that this host is one we want to authenticate to, and do
2767 the business. The host name and address must be available when the
2768 authenticator's client driver is running. */
2769
2770 switch (yield = smtp_auth(sx))
2771 {
2772 default: goto SEND_QUIT;
2773 case OK: break;
2774 case FAIL_SEND: goto SEND_FAILED;
2775 case FAIL: goto RESPONSE_FAILED;
2776 }
2777 }
2778 }
2779 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2780
2781 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2782 message-specific. */
2783
2784 sx->setting_up = FALSE;
2785
2786 #ifdef SUPPORT_I18N
2787 if (sx->addrlist->prop.utf8_msg)
2788 {
2789 uschar * s;
2790
2791 /* If the transport sets a downconversion mode it overrides any set by ACL
2792 for the message. */
2793
2794 if ((s = ob->utf8_downconvert))
2795 {
2796 if (!(s = expand_string(s)))
2797 {
2798 message = string_sprintf("failed to expand utf8_downconvert: %s",
2799 expand_string_message);
2800 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2801 yield = DEFER;
2802 goto SEND_QUIT;
2803 }
2804 switch (*s)
2805 {
2806 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2807 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2808 break;
2809 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2810 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2811 break;
2812 case '-': if (s[1] == '1')
2813 {
2814 sx->addrlist->prop.utf8_downcvt = FALSE;
2815 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2816 }
2817 break;
2818 }
2819 }
2820
2821 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2822 && !sx->addrlist->prop.utf8_downcvt_maybe;
2823 DEBUG(D_transport) if (!sx->utf8_needed)
2824 debug_printf("utf8: %s downconvert\n",
2825 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2826 }
2827
2828 /* If this is an international message we need the host to speak SMTPUTF8 */
2829 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2830 {
2831 errno = ERRNO_UTF8_FWD;
2832 goto RESPONSE_FAILED;
2833 }
2834 #endif /*SUPPORT_I18N*/
2835
2836 return OK;
2837
2838
2839 {
2840 int code;
2841
2842 RESPONSE_FAILED:
2843 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2844 {
2845 /* There is a testing facility for simulating a connection timeout, as I
2846 can't think of any other way of doing this. It converts a connection
2847 refused into a timeout if the timeout is set to 999999. This is done for
2848 a 3whs connection in ip_connect(), but a TFO connection does not error
2849 there - instead it gets ECONNREFUSED on the first data read. Tracking
2850 that a TFO really was done is too hard, or we would set a
2851 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2852 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2853 cmd-timeout. */
2854
2855 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2856 errno = ETIMEDOUT;
2857 set_errno_nohost(sx->addrlist,
2858 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2859 sx->verify ? US strerror(errno) : NULL,
2860 DEFER, FALSE);
2861 sx->send_quit = FALSE;
2862 return DEFER;
2863 }
2864
2865 /* really an error on an SMTP read */
2866 message = NULL;
2867 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2868 sx->buffer, &code, &message, &pass_message);
2869 yield = DEFER;
2870 goto FAILED;
2871
2872 SEND_FAILED:
2873 code = '4';
2874 message = US string_sprintf("send() to %s [%s] failed: %s",
2875 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2876 sx->send_quit = FALSE;
2877 yield = DEFER;
2878 goto FAILED;
2879
2880 EHLOHELO_FAILED:
2881 code = '4';
2882 message = string_sprintf("Remote host closed connection in response to %s"
2883 " (EHLO response was: %s)", smtp_command, sx->buffer);
2884 sx->send_quit = FALSE;
2885 yield = DEFER;
2886 goto FAILED;
2887
2888 /* This label is jumped to directly when a TLS negotiation has failed,
2889 or was not done for a host for which it is required. Values will be set
2890 in message and errno, and setting_up will always be true. Treat as
2891 a temporary error. */
2892
2893 #ifndef DISABLE_TLS
2894 TLS_FAILED:
2895 code = '4', yield = DEFER;
2896 goto FAILED;
2897 #endif
2898
2899 /* The failure happened while setting up the call; see if the failure was
2900 a 5xx response (this will either be on connection, or following HELO - a 5xx
2901 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2902 fail all addresses, as this host is never going to accept them. For other
2903 errors during setting up (timeouts or whatever), defer all addresses, and
2904 yield DEFER, so that the host is not tried again for a while.
2905
2906 XXX This peeking for another host feels like a layering violation. We want
2907 to note the host as unusable, but down here we shouldn't know if this was
2908 the last host to try for the addr(list). Perhaps the upper layer should be
2909 the one to do set_errno() ? The problem is that currently the addr is where
2910 errno etc. are stashed, but until we run out of hosts to try the errors are
2911 host-specific. Maybe we should enhance the host_item definition? */
2912
2913 FAILED:
2914 sx->ok = FALSE; /* For when reached by GOTO */
2915 set_errno(sx->addrlist, errno, message,
2916 sx->conn_args.host->next
2917 ? DEFER
2918 : code == '5'
2919 #ifdef SUPPORT_I18N
2920 || errno == ERRNO_UTF8_FWD
2921 #endif
2922 ? FAIL : DEFER,
2923 pass_message,
2924 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2925 #ifdef EXPERIMENTAL_DSN_INFO
2926 , sx->smtp_greeting, sx->helo_response
2927 #endif
2928 );
2929 }
2930
2931
2932 SEND_QUIT:
2933
2934 if (sx->send_quit)
2935 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2936
2937 #ifndef DISABLE_TLS
2938 if (sx->cctx.tls_ctx)
2939 {
2940 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2941 sx->cctx.tls_ctx = NULL;
2942 }
2943 #endif
2944
2945 /* Close the socket, and return the appropriate value, first setting
2946 works because the NULL setting is passed back to the calling process, and
2947 remote_max_parallel is forced to 1 when delivering over an existing connection,
2948 */
2949
2950 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2951 if (sx->send_quit)
2952 {
2953 shutdown(sx->cctx.sock, SHUT_WR);
2954 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2955 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2956 i--; /* drain socket */
2957 sx->send_quit = FALSE;
2958 }
2959 (void)close(sx->cctx.sock);
2960 sx->cctx.sock = -1;
2961
2962 #ifndef DISABLE_EVENT
2963 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2964 #endif
2965
2966 continue_transport = NULL;
2967 continue_hostname = NULL;
2968 return yield;
2969 }
2970
2971
2972
2973
2974 /* Create the string of options that will be appended to the MAIL FROM:
2975 in the connection context buffer */
2976
2977 static int
2978 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2979 {
2980 uschar * p = sx->buffer;
2981 address_item * addr;
2982 int address_count;
2983
2984 *p = 0;
2985
2986 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2987 send it, adding something to the message size to allow for imprecision
2988 and things that get added en route. Exim keeps the number of lines
2989 in a message, so we can give an accurate value for the original message, but we
2990 need some additional to handle added headers. (Double "." characters don't get
2991 included in the count.) */
2992
2993 if ( message_size > 0
2994 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2995 {
2996 /*XXX problem here under spool_files_wireformat?
2997 Or just forget about lines? Or inflate by a fixed proportion? */
2998
2999 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3000 while (*p) p++;
3001 }
3002
3003 #ifndef DISABLE_PRDR
3004 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3005 request that */
3006
3007 sx->prdr_active = FALSE;
3008 if (sx->peer_offered & OPTION_PRDR)
3009 for (address_item * addr = addrlist; addr; addr = addr->next)
3010 if (addr->transport_return == PENDING_DEFER)
3011 {
3012 for (addr = addr->next; addr; addr = addr->next)
3013 if (addr->transport_return == PENDING_DEFER)
3014 { /* at least two recipients to send */
3015 sx->prdr_active = TRUE;
3016 sprintf(CS p, " PRDR"); p += 5;
3017 break;
3018 }
3019 break;
3020 }
3021 #endif
3022
3023 #ifdef SUPPORT_I18N
3024 /* If it supports internationalised messages, and this meesage need that,
3025 request it */
3026
3027 if ( sx->peer_offered & OPTION_UTF8
3028 && addrlist->prop.utf8_msg
3029 && !addrlist->prop.utf8_downcvt
3030 )
3031 Ustrcpy(p, " SMTPUTF8"), p += 9;
3032 #endif
3033
3034 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3035 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3036 addr && address_count < sx->max_rcpt;
3037 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3038 {
3039 address_count++;
3040 if (!(addr->dsn_flags & rf_dsnlasthop))
3041 {
3042 sx->dsn_all_lasthop = FALSE;
3043 break;
3044 }
3045 }
3046
3047 /* Add any DSN flags to the mail command */
3048
3049 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3050 {
3051 if (dsn_ret == dsn_ret_hdrs)
3052 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3053 else if (dsn_ret == dsn_ret_full)
3054 { Ustrcpy(p, " RET=FULL"); p += 9; }
3055
3056 if (dsn_envid)
3057 {
3058 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3059 while (*p) p++;
3060 }
3061 }
3062
3063 /* If an authenticated_sender override has been specified for this transport
3064 instance, expand it. If the expansion is forced to fail, and there was already
3065 an authenticated_sender for this message, the original value will be used.
3066 Other expansion failures are serious. An empty result is ignored, but there is
3067 otherwise no check - this feature is expected to be used with LMTP and other
3068 cases where non-standard addresses (e.g. without domains) might be required. */
3069
3070 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3071 return ERROR;
3072
3073 return OK;
3074 }
3075
3076
3077 static void
3078 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3079 {
3080 uschar * p = sx->buffer;
3081 *p = 0;
3082
3083 /* Add any DSN flags to the rcpt command */
3084
3085 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3086 {
3087 if (addr->dsn_flags & rf_dsnflags)
3088 {
3089 BOOL first = TRUE;
3090
3091 Ustrcpy(p, " NOTIFY=");
3092 while (*p) p++;
3093 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3094 {
3095 if (!first) *p++ = ',';
3096 first = FALSE;
3097 Ustrcpy(p, rf_names[i]);
3098 while (*p) p++;
3099 }
3100 }
3101
3102 if (addr->dsn_orcpt)
3103 {
3104 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3105 addr->dsn_orcpt);
3106 while (*p) p++;
3107 }
3108 }
3109 }
3110
3111
3112
3113 /*
3114 Return:
3115 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3116 -1 MAIL response error
3117 -2 any non-MAIL read i/o error
3118 -3 non-MAIL response timeout
3119 -4 internal error; channel still usable
3120 -5 transmit failed
3121 */
3122
3123 int
3124 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3125 {
3126 address_item * addr;
3127 int address_count;
3128 int rc;
3129
3130 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3131 {
3132 *yield = ERROR;
3133 return -4;
3134 }
3135
3136 /* From here until we send the DATA command, we can make use of PIPELINING
3137 if the server host supports it. The code has to be able to check the responses
3138 at any point, for when the buffer fills up, so we write it totally generally.
3139 When PIPELINING is off, each command written reports that it has flushed the
3140 buffer. */
3141
3142 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3143
3144 {
3145 uschar * s = sx->from_addr;
3146 #ifdef SUPPORT_I18N
3147 uschar * errstr = NULL;
3148
3149 /* If we must downconvert, do the from-address here. Remember we had to
3150 for the to-addresses (done below), and also (ugly) for re-doing when building
3151 the delivery log line. */
3152
3153 if ( sx->addrlist->prop.utf8_msg
3154 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3155 )
3156 {
3157 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3158 {
3159 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3160 *yield = ERROR;
3161 return -4;
3162 }
3163 setflag(sx->addrlist, af_utf8_downcvt);
3164 }
3165 #endif
3166
3167 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3168 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3169 }
3170
3171 mail_command = string_copy(big_buffer); /* Save for later error message */
3172
3173 switch(rc)
3174 {
3175 case -1: /* Transmission error */
3176 return -5;
3177
3178 case +1: /* Cmd was sent */
3179 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3180 (SOB sx->conn_args.ob)->command_timeout))
3181 {
3182 if (errno == 0 && sx->buffer[0] == '4')
3183 {
3184 errno = ERRNO_MAIL4XX;
3185 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3186 }
3187 return -1;
3188 }
3189 sx->pending_MAIL = FALSE;
3190 break;
3191
3192 /* otherwise zero: command queued for pipeline */
3193 }
3194
3195 /* Pass over all the relevant recipient addresses for this host, which are the
3196 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3197 several before we have to read the responses for those seen so far. This
3198 checking is done by a subroutine because it also needs to be done at the end.
3199 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3200 the next one if not all are sent.
3201
3202 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3203 last address because we want to abort if any recipients have any kind of
3204 problem, temporary or permanent. We know that all recipient addresses will have
3205 the PENDING_DEFER status, because only one attempt is ever made, and we know
3206 that max_rcpt will be large, so all addresses will be done at once.
3207
3208 For verify we flush the pipeline after any (the only) rcpt address. */
3209
3210 for (addr = sx->first_addr, address_count = 0;
3211 addr && address_count < sx->max_rcpt;
3212 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3213 {
3214 int count;
3215 BOOL no_flush;
3216 uschar * rcpt_addr;
3217
3218 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3219 ? dsn_support_yes : dsn_support_no;
3220
3221 address_count++;
3222 no_flush = pipelining_active && !sx->verify
3223 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3224
3225 build_rcptcmd_options(sx, addr);
3226
3227 /* Now send the RCPT command, and process outstanding responses when
3228 necessary. After a timeout on RCPT, we just end the function, leaving the
3229 yield as OK, because this error can often mean that there is a problem with
3230 just one address, so we don't want to delay the host. */
3231
3232 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3233
3234 #ifdef SUPPORT_I18N
3235 if ( testflag(sx->addrlist, af_utf8_downcvt)
3236 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3237 )
3238 {
3239 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3240 errno = ERRNO_EXPANDFAIL;
3241 return -5; /*XXX too harsh? */
3242 }
3243 #endif
3244
3245 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3246 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3247
3248 if (count < 0) return -5;
3249 if (count > 0)
3250 {
3251 switch(sync_responses(sx, count, 0))
3252 {
3253 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3254 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3255 break;
3256
3257 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3258 if (!sx->lmtp) /* can't tell about progress yet */
3259 sx->completed_addr = TRUE;
3260 case 0: /* No 2xx or 5xx, but no probs */
3261 break;
3262
3263 case -1: return -3; /* Timeout on RCPT */
3264 case -2: return -2; /* non-MAIL read i/o error */
3265 default: return -1; /* any MAIL error */
3266
3267 #ifdef EXPERIMENTAL_PIPE_CONNECT
3268 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3269 case -5: return -1; /* TLS first-read error */
3270 #endif
3271 }
3272 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3273 }
3274 } /* Loop for next address */
3275
3276 sx->next_addr = addr;
3277 return 0;
3278 }
3279
3280
3281 #ifndef DISABLE_TLS
3282 /*****************************************************
3283 * Proxy TLS connection for another transport process *
3284 ******************************************************/
3285 /*
3286 Close the unused end of the pipe, fork once more, then use the given buffer
3287 as a staging area, and select on both the given fd and the TLS'd client-fd for
3288 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3289 Do blocking full-size writes, and reads under a timeout. Once both input
3290 channels are closed, exit the process.
3291
3292 Arguments:
3293 ct_ctx tls context
3294 buf space to use for buffering
3295 bufsiz size of buffer
3296 pfd pipe filedescriptor array; [0] is comms to proxied process
3297 timeout per-read timeout, seconds
3298 */
3299
3300 void
3301 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3302 int timeout)
3303 {
3304 fd_set rfds, efds;
3305 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3306 int rc, i;
3307
3308 close(pfd[1]);
3309 if ((rc = fork()))
3310 {
3311 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3312 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3313 }
3314
3315 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3316 set_process_info("proxying TLS connection for continued transport");
3317 FD_ZERO(&rfds);
3318 FD_SET(tls_out.active.sock, &rfds);
3319 FD_SET(pfd[0], &rfds);
3320
3321 for (int fd_bits = 3; fd_bits; )
3322 {
3323 time_t time_left = timeout;
3324 time_t time_start = time(NULL);
3325
3326 /* wait for data */
3327 efds = rfds;
3328 do
3329 {
3330 struct timeval tv = { time_left, 0 };
3331
3332 rc = select(max_fd,
3333 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3334
3335 if (rc < 0 && errno == EINTR)
3336 if ((time_left -= time(NULL) - time_start) > 0) continue;
3337
3338 if (rc <= 0)
3339 {
3340 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3341 goto done;
3342 }
3343
3344 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3345 {
3346 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3347 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3348 goto done;
3349 }
3350 }
3351 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3352
3353 /* handle inbound data */
3354 if (FD_ISSET(tls_out.active.sock, &rfds))
3355 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3356 {
3357 fd_bits &= ~1;
3358 FD_CLR(tls_out.active.sock, &rfds);
3359 shutdown(pfd[0], SHUT_WR);
3360 timeout = 5;
3361 }
3362 else
3363 {
3364 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3365 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3366 }
3367 else if (fd_bits & 1)
3368 FD_SET(tls_out.active.sock, &rfds);
3369
3370 /* handle outbound data */
3371 if (FD_ISSET(pfd[0], &rfds))
3372 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3373 {
3374 fd_bits = 0;
3375 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3376 ct_ctx = NULL;
3377 }
3378 else
3379 {
3380 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3381 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3382 goto done;
3383 }
3384 else if (fd_bits & 2)
3385 FD_SET(pfd[0], &rfds);
3386 }
3387
3388 done:
3389 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3390 exim_exit(0, US"TLS proxy");
3391 }
3392 #endif
3393
3394
3395 /*************************************************
3396 * Deliver address list to given host *
3397 *************************************************/
3398
3399 /* If continue_hostname is not null, we get here only when continuing to
3400 deliver down an existing channel. The channel was passed as the standard
3401 input. TLS is never active on a passed channel; the previous process always
3402 closes it down before passing the connection on.
3403
3404 Otherwise, we have to make a connection to the remote host, and do the
3405 initial protocol exchange.
3406
3407 When running as an MUA wrapper, if the sender or any recipient is rejected,
3408 temporarily or permanently, we force failure for all recipients.
3409
3410 Arguments:
3411 addrlist chain of potential addresses to deliver; only those whose
3412 transport_return field is set to PENDING_DEFER are currently
3413 being processed; others should be skipped - they have either
3414 been delivered to an earlier host or IP address, or been
3415 failed by one of them.
3416 host host to deliver to
3417 host_af AF_INET or AF_INET6
3418 defport default TCP/IP port to use if host does not specify, in host
3419 byte order
3420 interface interface to bind to, or NULL
3421 tblock transport instance block
3422 message_defer set TRUE if yield is OK, but all addresses were deferred
3423 because of a non-recipient, non-host failure, that is, a
3424 4xx response to MAIL FROM, DATA, or ".". This is a defer
3425 that is specific to the message.
3426 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3427 a second attempt after TLS initialization fails
3428
3429 Returns: OK - the connection was made and the delivery attempted;
3430 the result for each address is in its data block.
3431 DEFER - the connection could not be made, or something failed
3432 while setting up the SMTP session, or there was a
3433 non-message-specific error, such as a timeout.
3434 ERROR - a filter command is specified for this transport,
3435 and there was a problem setting it up; OR helo_data
3436 or add_headers or authenticated_sender is specified
3437 for this transport, and the string failed to expand
3438 */
3439
3440 static int
3441 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3442 uschar *interface, transport_instance *tblock,
3443 BOOL *message_defer, BOOL suppress_tls)
3444 {
3445 smtp_transport_options_block * ob = SOB tblock->options_block;
3446 int yield = OK;
3447 int save_errno;
3448 int rc;
3449 struct timeval start_delivery_time;
3450
3451 BOOL pass_message = FALSE;
3452 uschar *message = NULL;
3453 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3454
3455 smtp_context sx;
3456
3457 gettimeofday(&start_delivery_time, NULL);
3458 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3459 *message_defer = FALSE;
3460
3461 sx.addrlist = addrlist;
3462 sx.conn_args.host = host;
3463 sx.conn_args.host_af = host_af,
3464 sx.port = defport;
3465 sx.conn_args.interface = interface;
3466 sx.helo_data = NULL;
3467 sx.conn_args.tblock = tblock;
3468 sx.verify = FALSE;
3469 sx.sync_addr = sx.first_addr = addrlist;
3470
3471 /* Get the channel set up ready for a message (MAIL FROM being the next
3472 SMTP command to send */
3473
3474 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3475 return rc;
3476
3477 /* If there is a filter command specified for this transport, we can now
3478 set it up. This cannot be done until the identify of the host is known. */
3479
3480 if (tblock->filter_command)
3481 {
3482 transport_filter_timeout = tblock->filter_timeout;
3483
3484 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3485 yield ERROR. */
3486
3487 if (!transport_set_up_command(&transport_filter_argv,
3488 tblock->filter_command, TRUE, DEFER, addrlist,
3489 string_sprintf("%.50s transport", tblock->name), NULL))
3490 {
3491 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3492 FALSE);
3493 yield = ERROR;
3494 goto SEND_QUIT;
3495 }
3496
3497 if ( transport_filter_argv
3498 && *transport_filter_argv
3499 && **transport_filter_argv
3500 && sx.peer_offered & OPTION_CHUNKING
3501 )
3502 {
3503 sx.peer_offered &= ~OPTION_CHUNKING;
3504 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3505 }
3506 }
3507
3508 /* For messages that have more than the maximum number of envelope recipients,
3509 we want to send several transactions down the same SMTP connection. (See
3510 comments in deliver.c as to how this reconciles, heuristically, with
3511 remote_max_parallel.) This optimization was added to Exim after the following
3512 code was already working. The simplest way to put it in without disturbing the
3513 code was to use a goto to jump back to this point when there is another
3514 transaction to handle. */
3515
3516 SEND_MESSAGE:
3517 sx.from_addr = return_path;
3518 sx.sync_addr = sx.first_addr;
3519 sx.ok = FALSE;
3520 sx.send_rset = TRUE;
3521 sx.completed_addr = FALSE;
3522
3523
3524 /* If we are a continued-connection-after-verify the MAIL and RCPT
3525 commands were already sent; do not re-send but do mark the addrs as
3526 having been accepted up to RCPT stage. A traditional cont-conn
3527 always has a sequence number greater than one. */
3528
3529 if (continue_hostname && continue_sequence == 1)
3530 {
3531 sx.peer_offered = smtp_peer_options;
3532 sx.pending_MAIL = FALSE;
3533 sx.ok = TRUE;
3534 sx.next_addr = NULL;
3535
3536 for (address_item * addr = addrlist; addr; addr = addr->next)
3537 addr->transport_return = PENDING_OK;
3538 }
3539 else
3540 {
3541 /* Initiate a message transfer. */
3542
3543 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3544 {
3545 case 0: break;
3546 case -1: case -2: goto RESPONSE_FAILED;
3547 case -3: goto END_OFF;
3548 case -4: goto SEND_QUIT;
3549 default: goto SEND_FAILED;
3550 }
3551
3552 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3553 permanently or temporarily. We should have flushed and synced after the last
3554 RCPT. */
3555
3556 if (mua_wrapper)
3557 {
3558 address_item * a;
3559 unsigned cnt;
3560
3561 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3562 if (a->transport_return != PENDING_OK)
3563 {
3564 /*XXX could we find a better errno than 0 here? */
3565 set_errno_nohost(addrlist, 0, a->message, FAIL,
3566 testflag(a, af_pass_message));
3567 sx.ok = FALSE;
3568 break;
3569 }
3570 }
3571 }
3572
3573 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3574 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3575 have a good recipient buffered up if we are pipelining. We don't want to waste
3576 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3577 are pipelining. The responses are all handled by sync_responses().
3578 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3579 to send is. */
3580
3581 if ( !(sx.peer_offered & OPTION_CHUNKING)
3582 && (sx.ok || (pipelining_active && !mua_wrapper)))
3583 {
3584 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3585
3586 if (count < 0) goto SEND_FAILED;
3587 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3588 {
3589 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3590 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3591 break;
3592
3593 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3594 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3595 case 0: break; /* No 2xx or 5xx, but no probs */
3596
3597 case -1: goto END_OFF; /* Timeout on RCPT */
3598
3599 #ifdef EXPERIMENTAL_PIPE_CONNECT
3600 case -5: /* TLS first-read error */
3601 case -4: HDEBUG(D_transport)
3602 debug_printf("failed reaping pipelined cmd responses\n");
3603 #endif
3604 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3605 }
3606 pipelining_active = FALSE;
3607 data_command = string_copy(big_buffer); /* Save for later error message */
3608 }
3609
3610 /* If there were no good recipients (but otherwise there have been no
3611 problems), just set ok TRUE, since we have handled address-specific errors
3612 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3613 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3614 well as body. Set the appropriate timeout value to be used for each chunk.
3615 (Haven't been able to make it work using select() for writing yet.) */
3616
3617 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3618 {
3619 /* Save the first address of the next batch. */
3620 sx.first_addr = sx.next_addr;
3621
3622 sx.ok = TRUE;
3623 }
3624 else
3625 {
3626 transport_ctx tctx = {
3627 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3628 .tblock = tblock,
3629 .addr = addrlist,
3630 .check_string = US".",
3631 .escape_string = US"..", /* Escaping strings */
3632 .options =
3633 topt_use_crlf | topt_escape_headers
3634 | (tblock->body_only ? topt_no_headers : 0)
3635 | (tblock->headers_only ? topt_no_body : 0)
3636 | (tblock->return_path_add ? topt_add_return_path : 0)
3637 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3638 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3639 };
3640
3641 /* If using CHUNKING we need a callback from the generic transport
3642 support to us, for the sending of BDAT smtp commands and the reaping
3643 of responses. The callback needs a whole bunch of state so set up
3644 a transport-context structure to be passed around. */
3645
3646 if (sx.peer_offered & OPTION_CHUNKING)
3647 {
3648 tctx.check_string = tctx.escape_string = NULL;
3649 tctx.options |= topt_use_bdat;
3650 tctx.chunk_cb = smtp_chunk_cmd_callback;
3651 sx.pending_BDAT = FALSE;
3652 sx.good_RCPT = sx.ok;
3653 sx.cmd_count = 0;
3654 tctx.smtp_context = &sx;
3655 }
3656 else
3657 tctx.options |= topt_end_dot;
3658
3659 /* Save the first address of the next batch. */
3660 sx.first_addr = sx.next_addr;
3661
3662 /* Responses from CHUNKING commands go in buffer. Otherwise,
3663 there has not been a response. */
3664
3665 sx.buffer[0] = 0;
3666
3667 sigalrm_seen = FALSE;
3668 transport_write_timeout = ob->data_timeout;
3669 smtp_command = US"sending data block"; /* For error messages */
3670 DEBUG(D_transport|D_v)
3671 if (sx.peer_offered & OPTION_CHUNKING)
3672 debug_printf(" will write message using CHUNKING\n");
3673 else
3674 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3675 transport_count = 0;
3676
3677 #ifndef DISABLE_DKIM
3678 dkim_exim_sign_init();
3679 # ifdef EXPERIMENTAL_ARC
3680 {
3681 uschar * s = ob->arc_sign;
3682 if (s)
3683 {
3684 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3685 {
3686 if (!f.expand_string_forcedfail)
3687 {
3688 message = US"failed to expand arc_sign";
3689 sx.ok = FALSE;
3690 goto SEND_FAILED;
3691 }
3692 }
3693 else if (*s)
3694 {
3695 /* Ask dkim code to hash the body for ARC */
3696 (void) arc_ams_setup_sign_bodyhash();
3697 ob->dkim.force_bodyhash = TRUE;
3698 }
3699 }
3700 }
3701 # endif
3702 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3703 #else
3704 sx.ok = transport_write_message(&tctx, 0);
3705 #endif
3706
3707 /* transport_write_message() uses write() because it is called from other
3708 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3709 it can exit with "Broken pipe" as its error. This really means that the
3710 socket got closed at the far end. */
3711
3712 transport_write_timeout = 0; /* for subsequent transports */
3713
3714 /* Failure can either be some kind of I/O disaster (including timeout),
3715 or the failure of a transport filter or the expansion of added headers.
3716 Or, when CHUNKING, it can be a protocol-detected failure. */
3717
3718 if (!sx.ok)
3719 if (message) goto SEND_FAILED;
3720 else goto RESPONSE_FAILED;
3721
3722 /* We used to send the terminating "." explicitly here, but because of
3723 buffering effects at both ends of TCP/IP connections, you don't gain
3724 anything by keeping it separate, so it might as well go in the final
3725 data buffer for efficiency. This is now done by setting the topt_end_dot
3726 flag above. */
3727
3728 smtp_command = US"end of data";
3729
3730 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3731 {
3732 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3733 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3734 {
3735 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3736 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3737 break;
3738
3739 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3740 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3741 case 0: break; /* No 2xx or 5xx, but no probs */
3742
3743 case -1: goto END_OFF; /* Timeout on RCPT */
3744
3745 #ifdef EXPERIMENTAL_PIPE_CONNECT
3746 case -5: /* TLS first-read error */
3747 case -4: HDEBUG(D_transport)
3748 debug_printf("failed reaping pipelined cmd responses\n");
3749 #endif
3750 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3751 }
3752 }
3753
3754 #ifndef DISABLE_PRDR
3755 /* For PRDR we optionally get a partial-responses warning followed by the
3756 individual responses, before going on with the overall response. If we don't
3757 get the warning then deal with per non-PRDR. */
3758
3759 if(sx.prdr_active)
3760 {
3761 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3762 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3763 {
3764 case '2': sx.prdr_active = FALSE;
3765 sx.ok = TRUE;
3766 break;
3767 case '4': errno = ERRNO_DATA4XX;
3768 addrlist->more_errno |=
3769 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3770 break;
3771 }
3772 }
3773 else
3774 #endif
3775
3776 /* For non-PRDR SMTP, we now read a single response that applies to the
3777 whole message. If it is OK, then all the addresses have been delivered. */
3778
3779 if (!sx.lmtp)
3780 {
3781 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3782 ob->final_timeout);
3783 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3784 {
3785 errno = ERRNO_DATA4XX;
3786 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3787 }
3788 }
3789
3790 /* For LMTP, we get back a response for every RCPT command that we sent;
3791 some may be accepted and some rejected. For those that get a response, their
3792 status is fixed; any that are accepted have been handed over, even if later
3793 responses crash - at least, that's how I read RFC 2033.
3794
3795 If all went well, mark the recipient addresses as completed, record which
3796 host/IPaddress they were delivered to, and cut out RSET when sending another
3797 message down the same channel. Write the completed addresses to the journal
3798 now so that they are recorded in case there is a crash of hardware or
3799 software before the spool gets updated. Also record the final SMTP
3800 confirmation if needed (for SMTP only). */
3801
3802 if (sx.ok)
3803 {
3804 int flag = '=';
3805 struct timeval delivery_time;
3806 int len;
3807 uschar * conf = NULL;
3808
3809 timesince(&delivery_time, &start_delivery_time);
3810 sx.send_rset = FALSE;
3811 pipelining_active = FALSE;
3812
3813 /* Set up confirmation if needed - applies only to SMTP */
3814
3815 if (
3816 #ifdef DISABLE_EVENT
3817 LOGGING(smtp_confirmation) &&
3818 #endif
3819 !sx.lmtp
3820 )
3821 {
3822 const uschar *s = string_printing(sx.buffer);
3823 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3824 conf = (s == sx.buffer)? US string_copy(s) : US s;
3825 }
3826
3827 /* Process all transported addresses - for LMTP or PRDR, read a status for
3828 each one. */
3829
3830 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3831 {
3832 if (addr->transport_return != PENDING_OK) continue;
3833
3834 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3835 remaining addresses. Otherwise, it's a return code for just the one
3836 address. For temporary errors, add a retry item for the address so that
3837 it doesn't get tried again too soon. */
3838
3839 #ifndef DISABLE_PRDR
3840 if (sx.lmtp || sx.prdr_active)
3841 #else
3842 if (sx.lmtp)
3843 #endif
3844 {
3845 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3846 ob->final_timeout))
3847 {
3848 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3849 addr->message = string_sprintf(
3850 #ifndef DISABLE_PRDR
3851 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3852 #else
3853 "LMTP error after %s: %s",
3854 #endif
3855 data_command, string_printing(sx.buffer));
3856 setflag(addr, af_pass_message); /* Allow message to go to user */
3857 if (sx.buffer[0] == '5')
3858 addr->transport_return = FAIL;
3859 else
3860 {
3861 errno = ERRNO_DATA4XX;
3862 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3863 addr->transport_return = DEFER;
3864 #ifndef DISABLE_PRDR
3865 if (!sx.prdr_active)
3866 #endif
3867 retry_add_item(addr, addr->address_retry_key, 0);
3868 }
3869 continue;
3870 }
3871 sx.completed_addr = TRUE; /* NOW we can set this flag */
3872 if (LOGGING(smtp_confirmation))
3873 {
3874 const uschar *s = string_printing(sx.buffer);
3875 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3876 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3877 }
3878 }
3879
3880 /* SMTP, or success return from LMTP for this address. Pass back the
3881 actual host that was used. */
3882
3883 addr->transport_return = OK;
3884 addr->more_errno = delivery_time.tv_sec;
3885 addr->delivery_usec = delivery_time.tv_usec;
3886 addr->host_used = host;
3887 addr->special_action = flag;
3888 addr->message = conf;
3889
3890 if (tcp_out_fastopen)
3891 {
3892 setflag(addr, af_tcp_fastopen_conn);
3893 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3894 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3895 }
3896 if (sx.pipelining_used) setflag(addr, af_pipelining);
3897 #ifdef EXPERIMENTAL_PIPE_CONNECT
3898 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3899 #endif
3900 #ifndef DISABLE_PRDR
3901 if (sx.prdr_active) setflag(addr, af_prdr_used);
3902 #endif
3903 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3904 flag = '-';
3905
3906 #ifndef DISABLE_PRDR
3907 if (!sx.prdr_active)
3908 #endif
3909 {
3910 /* Update the journal. For homonymic addresses, use the base address plus
3911 the transport name. See lots of comments in deliver.c about the reasons
3912 for the complications when homonyms are involved. Just carry on after
3913 write error, as it may prove possible to update the spool file later. */
3914
3915 if (testflag(addr, af_homonym))
3916 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3917 else
3918 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3919
3920 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3921 len = Ustrlen(CS sx.buffer);
3922 if (write(journal_fd, sx.buffer, len) != len)
3923 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3924 "%s: %s", sx.buffer, strerror(errno));
3925 }
3926 }
3927
3928 #ifndef DISABLE_PRDR
3929 if (sx.prdr_active)
3930 {
3931 const uschar * overall_message;
3932
3933 /* PRDR - get the final, overall response. For any non-success
3934 upgrade all the address statuses. */
3935
3936 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3937 ob->final_timeout);
3938 if (!sx.ok)
3939 {
3940 if(errno == 0 && sx.buffer[0] == '4')
3941 {
3942 errno = ERRNO_DATA4XX;
3943 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3944 }
3945 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3946 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3947 addr->transport_return = PENDING_OK; /* allow set_errno action */
3948 goto RESPONSE_FAILED;
3949 }
3950
3951 /* Append the overall response to the individual PRDR response for logging
3952 and update the journal, or setup retry. */
3953
3954 overall_message = string_printing(sx.buffer);
3955 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3956 if (addr->transport_return == OK)
3957 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3958
3959 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3960 if (addr->transport_return == OK)
3961 {
3962 if (testflag(addr, af_homonym))
3963 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3964 else
3965 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3966
3967 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3968 len = Ustrlen(CS sx.buffer);
3969 if (write(journal_fd, sx.buffer, len) != len)
3970 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3971 "%s: %s", sx.buffer, strerror(errno));
3972 }
3973 else if (addr->transport_return == DEFER)
3974 retry_add_item(addr, addr->address_retry_key, -2);
3975 }
3976 #endif
3977
3978 /* Ensure the journal file is pushed out to disk. */
3979
3980 if (EXIMfsync(journal_fd) < 0)
3981 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3982 strerror(errno));
3983 }
3984 }
3985
3986
3987 /* Handle general (not specific to one address) failures here. The value of ok
3988 is used to skip over this code on the falling through case. A timeout causes a
3989 deferral. Other errors may defer or fail according to the response code, and
3990 may set up a special errno value, e.g. after connection chopped, which is
3991 assumed if errno == 0 and there is no text in the buffer. If control reaches
3992 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3993 the problem is not related to this specific message. */
3994
3995 if (!sx.ok)
3996 {
3997 int code, set_rc;
3998 uschar * set_message;
3999
4000 RESPONSE_FAILED:
4001 {
4002 save_errno = errno;
4003 message = NULL;
4004 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4005 sx.buffer, &code, &message, &pass_message);
4006 goto FAILED;
4007 }
4008
4009 SEND_FAILED:
4010 {
4011 save_errno = errno;
4012 code = '4';
4013 message = string_sprintf("send() to %s [%s] failed: %s",
4014 host->name, host->address, message ? message : US strerror(save_errno));
4015 sx.send_quit = FALSE;
4016 goto FAILED;
4017 }
4018
4019 FAILED:
4020 {
4021 BOOL message_error;
4022
4023 sx.ok = FALSE; /* For when reached by GOTO */
4024 set_message = message;
4025
4026 /* We want to handle timeouts after MAIL or "." and loss of connection after
4027 "." specially. They can indicate a problem with the sender address or with
4028 the contents of the message rather than a real error on the connection. These
4029 cases are treated in the same way as a 4xx response. This next bit of code
4030 does the classification. */
4031
4032 switch(save_errno)
4033 {
4034 case 0:
4035 case ERRNO_MAIL4XX:
4036 case ERRNO_DATA4XX:
4037 message_error = TRUE;
4038 break;
4039
4040 case ETIMEDOUT:
4041 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4042 Ustrncmp(smtp_command,"end ",4) == 0;
4043 break;
4044
4045 case ERRNO_SMTPCLOSED:
4046 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4047 break;
4048
4049 default:
4050 message_error = FALSE;
4051 break;
4052 }
4053
4054 /* Handle the cases that are treated as message errors. These are:
4055
4056 (a) negative response or timeout after MAIL
4057 (b) negative response after DATA
4058 (c) negative response or timeout or dropped connection after "."
4059 (d) utf8 support required and not offered
4060
4061 It won't be a negative response or timeout after RCPT, as that is dealt
4062 with separately above. The action in all cases is to set an appropriate
4063 error code for all the addresses, but to leave yield set to OK because the
4064 host itself has not failed. Of course, it might in practice have failed
4065 when we've had a timeout, but if so, we'll discover that at the next
4066 delivery attempt. For a temporary error, set the message_defer flag, and
4067 write to the logs for information if this is not the last host. The error
4068 for the last host will be logged as part of the address's log line. */
4069
4070 if (message_error)
4071 {
4072 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4073
4074 /* If there's an errno, the message contains just the identity of
4075 the host. */
4076
4077 if (code == '5')
4078 set_rc = FAIL;
4079 else /* Anything other than 5 is treated as temporary */
4080 {
4081 set_rc = DEFER;
4082 if (save_errno > 0)
4083 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4084
4085 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4086
4087 *message_defer = TRUE;
4088 }
4089 }
4090
4091 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4092 ".", or some other transportation error. We defer all addresses and yield
4093 DEFER, except for the case of failed add_headers expansion, or a transport
4094 filter failure, when the yield should be ERROR, to stop it trying other
4095 hosts. */
4096
4097 else
4098 {
4099 #ifdef EXPERIMENTAL_PIPE_CONNECT
4100 /* If we were early-pipelinng and the actual EHLO response did not match
4101 the cached value we assumed, we could have detected it and passed a
4102 custom errno through to here. It would be nice to RSET and retry right
4103 away, but to reliably do that we eould need an extra synch point before
4104 we committed to data and that would discard half the gained roundrips.
4105 Or we could summarily drop the TCP connection. but that is also ugly.
4106 Instead, we ignore the possibility (having freshened the cache) and rely
4107 on the server telling us with a nonmessage error if we have tried to
4108 do something it no longer supports. */
4109 #endif
4110 set_rc = DEFER;
4111 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4112 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4113 }
4114 }
4115
4116 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4117 #ifdef EXPERIMENTAL_DSN_INFO
4118 , sx.smtp_greeting, sx.helo_response
4119 #endif
4120 );
4121 }
4122
4123
4124 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4125 SMTP session tidily. However, if there were too many addresses to send in one
4126 message (indicated by first_addr being non-NULL) we want to carry on with the
4127 rest of them. Also, it is desirable to send more than one message down the SMTP
4128 connection if there are several waiting, provided we haven't already sent so
4129 many as to hit the configured limit. The function transport_check_waiting looks
4130 for a waiting message and returns its id. Then transport_pass_socket tries to
4131 set up a continued delivery by passing the socket on to another process. The
4132 variable send_rset is FALSE if a message has just been successfully transferred.
4133
4134 If we are already sending down a continued channel, there may be further
4135 addresses not yet delivered that are aimed at the same host, but which have not
4136 been passed in this run of the transport. In this case, continue_more will be
4137 true, and all we should do is send RSET if necessary, and return, leaving the
4138 channel open.
4139
4140 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4141 do not want to continue with other messages down the same channel, because that
4142 can lead to looping between two or more messages, all with the same,
4143 temporarily failing address(es). [The retry information isn't updated yet, so
4144 new processes keep on trying.] We probably also don't want to try more of this
4145 message's addresses either.
4146
4147 If we have started a TLS session, we have to end it before passing the
4148 connection to a new process. However, not all servers can handle this (Exim
4149 can), so we do not pass such a connection on if the host matches
4150 hosts_nopass_tls. */
4151
4152 DEBUG(D_transport)
4153 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4154 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4155 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4156
4157 if (sx.completed_addr && sx.ok && sx.send_quit)
4158 {
4159 BOOL more;
4160 smtp_compare_t t_compare;
4161
4162 t_compare.tblock = tblock;
4163 t_compare.current_sender_address = sender_address;
4164
4165 if ( sx.first_addr != NULL
4166 || f.continue_more
4167 || (
4168 #ifndef DISABLE_TLS
4169 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4170 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4171 )
4172 &&
4173 #endif
4174 transport_check_waiting(tblock->name, host->name,
4175 tblock->connection_max_messages, new_message_id, &more,
4176 (oicf)smtp_are_same_identities, (void*)&t_compare)
4177 ) )
4178 {
4179 uschar *msg;
4180 BOOL pass_message;
4181
4182 if (sx.send_rset)
4183 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4184 {
4185 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4186 host->address, strerror(errno));
4187 sx.send_quit = FALSE;
4188 }
4189 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4190 '2', ob->command_timeout)))
4191 {
4192 int code;
4193 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4194 &pass_message);
4195 if (!sx.send_quit)
4196 {
4197 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4198 host->name, host->address, msg);
4199 }
4200 }
4201
4202 /* Either RSET was not needed, or it succeeded */
4203
4204 if (sx.ok)
4205 {
4206 #ifndef DISABLE_TLS
4207 int pfd[2];
4208 #endif
4209 int socket_fd = sx.cctx.sock;
4210
4211
4212 if (sx.first_addr != NULL) /* More addresses still to be sent */
4213 { /* in this run of the transport */
4214 continue_sequence++; /* Causes * in logging */
4215 goto SEND_MESSAGE;
4216 }
4217
4218 /* Unless caller said it already has more messages listed for this host,
4219 pass the connection on to a new Exim process (below, the call to
4220 transport_pass_socket). If the caller has more ready, just return with
4221 the connection still open. */
4222
4223 #ifndef DISABLE_TLS
4224 if (tls_out.active.sock >= 0)
4225 if ( f.continue_more
4226 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4227 {
4228 /* Before passing the socket on, or returning to caller with it still
4229 open, we must shut down TLS. Not all MTAs allow for the continuation
4230 of the SMTP session when TLS is shut down. We test for this by sending
4231 a new EHLO. If we don't get a good response, we don't attempt to pass
4232 the socket on. */
4233
4234 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4235 sx.cctx.tls_ctx = NULL;
4236 smtp_peer_options = smtp_peer_options_wrap;
4237 sx.ok = !sx.smtps
4238 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4239 >= 0
4240 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4241 '2', ob->command_timeout);
4242
4243 if (sx.ok && f.continue_more)
4244 return yield; /* More addresses for another run */
4245 }
4246 else
4247 {
4248 /* Set up a pipe for proxying TLS for the new transport process */
4249
4250 smtp_peer_options |= OPTION_TLS;
4251 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4252 socket_fd = pfd[1];
4253 else
4254 set_errno(sx.first_addr, errno, US"internal allocation problem",
4255 DEFER, FALSE, host
4256 # ifdef EXPERIMENTAL_DSN_INFO
4257 , sx.smtp_greeting, sx.helo_response
4258 # endif
4259 );
4260 }
4261 else
4262 #endif
4263 if (f.continue_more)
4264 return yield; /* More addresses for another run */
4265
4266 /* If the socket is successfully passed, we mustn't send QUIT (or
4267 indeed anything!) from here. */
4268
4269 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4270 propagate it from the initial
4271 */
4272 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4273 host->address, new_message_id, socket_fd))
4274 {
4275 sx.send_quit = FALSE;
4276
4277 /* We have passed the client socket to a fresh transport process.
4278 If TLS is still active, we need to proxy it for the transport we
4279 just passed the baton to. Fork a child to to do it, and return to
4280 get logging done asap. Which way to place the work makes assumptions
4281 about post-fork prioritisation which may not hold on all platforms. */
4282 #ifndef DISABLE_TLS
4283 if (tls_out.active.sock >= 0)
4284 {
4285 int pid = fork();
4286 if (pid == 0) /* child; fork again to disconnect totally */
4287 {
4288 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4289 /* does not return */
4290 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4291 ob->command_timeout);
4292 }
4293
4294 if (pid > 0) /* parent */
4295 {
4296 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4297 close(pfd[0]);
4298 /* tidy the inter-proc to disconn the proxy proc */
4299 waitpid(pid, NULL, 0);
4300 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4301 sx.cctx.tls_ctx = NULL;
4302 (void)close(sx.cctx.sock);
4303 sx.cctx.sock = -1;
4304 continue_transport = NULL;
4305 continue_hostname = NULL;
4306 return yield;
4307 }
4308 log_write(0, LOG_PANIC_DIE, "fork failed");
4309 }
4310 #endif
4311 }
4312 }
4313
4314 /* If RSET failed and there are addresses left, they get deferred. */
4315 else
4316 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4317 #ifdef EXPERIMENTAL_DSN_INFO
4318 , sx.smtp_greeting, sx.helo_response
4319 #endif
4320 );
4321 }
4322 }
4323
4324 /* End off tidily with QUIT unless the connection has died or the socket has
4325 been passed to another process. There has been discussion on the net about what
4326 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4327 to wait for a response, but on the other hand, there isn't anything one can do
4328 with an error response, other than log it. Exim used to do that. However,
4329 further discussion suggested that it is positively advantageous not to wait for
4330 the response, but to close the session immediately. This is supposed to move
4331 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4332 load from the server. (Hosts that are both servers and clients may not see much
4333 difference, of course.) Further discussion indicated that this was safe to do
4334 on Unix systems which have decent implementations of TCP/IP that leave the
4335 connection around for a while (TIME_WAIT) after the application has gone away.
4336 This enables the response sent by the server to be properly ACKed rather than
4337 timed out, as can happen on broken TCP/IP implementations on other OS.
4338
4339 This change is being made on 31-Jul-98. After over a year of trouble-free
4340 operation, the old commented-out code was removed on 17-Sep-99. */
4341
4342 SEND_QUIT:
4343 #ifdef TCP_CORK
4344 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4345 #endif
4346 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4347
4348 END_OFF:
4349
4350 #ifndef DISABLE_TLS
4351 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4352 sx.cctx.tls_ctx = NULL;
4353 #endif
4354
4355 /* Close the socket, and return the appropriate value, first setting
4356 works because the NULL setting is passed back to the calling process, and
4357 remote_max_parallel is forced to 1 when delivering over an existing connection,
4358
4359 If all went well and continue_more is set, we shouldn't actually get here if
4360 there are further addresses, as the return above will be taken. However,
4361 writing RSET might have failed, or there may be other addresses whose hosts are
4362 specified in the transports, and therefore not visible at top level, in which
4363 case continue_more won't get set. */
4364
4365 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4366 if (sx.send_quit)
4367 {
4368 shutdown(sx.cctx.sock, SHUT_WR);
4369 millisleep(f.running_in_test_harness ? 200 : 20);
4370 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4371 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4372 i--; /* drain socket */
4373 }
4374 (void)close(sx.cctx.sock);
4375
4376 #ifndef DISABLE_EVENT
4377 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4378 #endif
4379
4380 continue_transport = NULL;
4381 continue_hostname = NULL;
4382 return yield;
4383 }
4384
4385
4386
4387
4388 /*************************************************
4389 * Closedown entry point *
4390 *************************************************/
4391
4392 /* This function is called when exim is passed an open smtp channel
4393 from another incarnation, but the message which it has been asked
4394 to deliver no longer exists. The channel is on stdin.
4395
4396 We might do fancy things like looking for another message to send down
4397 the channel, but if the one we sought has gone, it has probably been
4398 delivered by some other process that itself will seek further messages,
4399 so just close down our connection.
4400
4401 Argument: pointer to the transport instance block
4402 Returns: nothing
4403 */
4404
4405 void
4406 smtp_transport_closedown(transport_instance *tblock)
4407 {
4408 smtp_transport_options_block * ob = SOB tblock->options_block;
4409 client_conn_ctx cctx;
4410 smtp_context sx;
4411 uschar buffer[256];
4412 uschar inbuffer[4096];
4413 uschar outbuffer[16];
4414
4415 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4416 cctx.sock = fileno(stdin);
4417 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4418
4419 sx.inblock.cctx = &cctx;
4420 sx.inblock.buffer = inbuffer;
4421 sx.inblock.buffersize = sizeof(inbuffer);
4422 sx.inblock.ptr = inbuffer;
4423 sx.inblock.ptrend = inbuffer;
4424
4425 sx.outblock.cctx = &cctx;
4426 sx.outblock.buffersize = sizeof(outbuffer);
4427 sx.outblock.buffer = outbuffer;
4428 sx.outblock.ptr = outbuffer;
4429 sx.outblock.cmd_count = 0;
4430 sx.outblock.authenticating = FALSE;
4431
4432 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4433 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4434 (void)close(cctx.sock);
4435 }
4436
4437
4438
4439 /*************************************************
4440 * Prepare addresses for delivery *
4441 *************************************************/
4442
4443 /* This function is called to flush out error settings from previous delivery
4444 attempts to other hosts. It also records whether we got here via an MX record
4445 or not in the more_errno field of the address. We are interested only in
4446 addresses that are still marked DEFER - others may have got delivered to a
4447 previously considered IP address. Set their status to PENDING_DEFER to indicate
4448 which ones are relevant this time.
4449
4450 Arguments:
4451 addrlist the list of addresses
4452 host the host we are delivering to
4453
4454 Returns: the first address for this delivery
4455 */
4456
4457 static address_item *
4458 prepare_addresses(address_item *addrlist, host_item *host)
4459 {
4460 address_item *first_addr = NULL;
4461 for (address_item * addr = addrlist; addr; addr = addr->next)
4462 if (addr->transport_return == DEFER)
4463 {
4464 if (!first_addr) first_addr = addr;
4465 addr->transport_return = PENDING_DEFER;
4466 addr->basic_errno = 0;
4467 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4468 addr->message = NULL;
4469 #ifndef DISABLE_TLS
4470 addr->cipher = NULL;
4471 addr->ourcert = NULL;
4472 addr->peercert = NULL;
4473 addr->peerdn = NULL;
4474 addr->ocsp = OCSP_NOT_REQ;
4475 #endif
4476 #ifdef EXPERIMENTAL_DSN_INFO
4477 addr->smtp_greeting = NULL;
4478 addr->helo_response = NULL;
4479 #endif
4480 }
4481 return first_addr;
4482 }
4483
4484
4485
4486 /*************************************************
4487 * Main entry point *
4488 *************************************************/
4489
4490 /* See local README for interface details. As this is a remote transport, it is
4491 given a chain of addresses to be delivered in one connection, if possible. It
4492 always returns TRUE, indicating that each address has its own independent
4493 status set, except if there is a setting up problem, in which case it returns
4494 FALSE. */
4495
4496 BOOL
4497 smtp_transport_entry(
4498 transport_instance *tblock, /* data for this instantiation */
4499 address_item *addrlist) /* addresses we are working on */
4500 {
4501 int defport;
4502 int hosts_defer = 0;
4503 int hosts_fail = 0;
4504 int hosts_looked_up = 0;
4505 int hosts_retry = 0;
4506 int hosts_serial = 0;
4507 int hosts_total = 0;
4508 int total_hosts_tried = 0;
4509 BOOL expired = TRUE;
4510 uschar *expanded_hosts = NULL;
4511 uschar *pistring;
4512 uschar *tid = string_sprintf("%s transport", tblock->name);
4513 smtp_transport_options_block *ob = SOB tblock->options_block;
4514 host_item *hostlist = addrlist->host_list;
4515 host_item *host = NULL;
4516
4517 DEBUG(D_transport)
4518 {
4519 debug_printf("%s transport entered\n", tblock->name);
4520 for (address_item * addr = addrlist; addr; addr = addr->next)
4521 debug_printf(" %s\n", addr->address);
4522 if (hostlist)
4523 {
4524 debug_printf("hostlist:\n");
4525 for (host_item * host = hostlist; host; host = host->next)
4526 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4527 }
4528 if (continue_hostname)
4529 debug_printf("already connected to %s [%s] (on fd %d)\n",
4530 continue_hostname, continue_host_address,
4531 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4532 }
4533
4534 /* Set the flag requesting that these hosts be added to the waiting
4535 database if the delivery fails temporarily or if we are running with
4536 queue_smtp or a 2-stage queue run. This gets unset for certain
4537 kinds of error, typically those that are specific to the message. */
4538
4539 update_waiting = TRUE;
4540
4541 /* If a host list is not defined for the addresses - they must all have the
4542 same one in order to be passed to a single transport - or if the transport has
4543 a host list with hosts_override set, use the host list supplied with the
4544 transport. It is an error for this not to exist. */
4545
4546 if (!hostlist || (ob->hosts_override && ob->hosts))
4547 {
4548 if (!ob->hosts)
4549 {
4550 addrlist->message = string_sprintf("%s transport called with no hosts set",
4551 tblock->name);
4552 addrlist->transport_return = PANIC;
4553 return FALSE; /* Only top address has status */
4554 }
4555
4556 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4557 ob->hosts);
4558
4559 /* If the transport's host list contains no '$' characters, and we are not
4560 randomizing, it is fixed and therefore a chain of hosts can be built once
4561 and for all, and remembered for subsequent use by other calls to this
4562 transport. If, on the other hand, the host list does contain '$', or we are
4563 randomizing its order, we have to rebuild it each time. In the fixed case,
4564 as the hosts string will never be used again, it doesn't matter that we
4565 replace all the : characters with zeros. */
4566
4567 if (!ob->hostlist)
4568 {
4569 uschar *s = ob->hosts;
4570
4571 if (Ustrchr(s, '$') != NULL)
4572 {
4573 if (!(expanded_hosts = expand_string(s)))
4574 {
4575 addrlist->message = string_sprintf("failed to expand list of hosts "
4576 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4577 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4578 return FALSE; /* Only top address has status */
4579 }
4580 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4581 "\"%s\"\n", s, expanded_hosts);
4582 s = expanded_hosts;
4583 }
4584 else
4585 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4586
4587 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4588
4589 /* Check that the expansion yielded something useful. */
4590 if (!hostlist)
4591 {
4592 addrlist->message =
4593 string_sprintf("%s transport has empty hosts setting", tblock->name);
4594 addrlist->transport_return = PANIC;
4595 return FALSE; /* Only top address has status */
4596 }
4597
4598 /* If there was no expansion of hosts, save the host list for
4599 next time. */
4600
4601 if (!expanded_hosts) ob->hostlist = hostlist;
4602 }
4603
4604 /* This is not the first time this transport has been run in this delivery;
4605 the host list was built previously. */
4606
4607 else
4608 hostlist = ob->hostlist;
4609 }
4610
4611 /* The host list was supplied with the address. If hosts_randomize is set, we
4612 must sort it into a random order if it did not come from MX records and has not
4613 already been randomized (but don't bother if continuing down an existing
4614 connection). */
4615
4616 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4617 {
4618 host_item *newlist = NULL;
4619 while (hostlist)
4620 {
4621 host_item *h = hostlist;
4622 hostlist = hostlist->next;
4623
4624 h->sort_key = random_number(100);
4625
4626 if (!newlist)
4627 {
4628 h->next = NULL;
4629 newlist = h;
4630 }
4631 else if (h->sort_key < newlist->sort_key)
4632 {
4633 h->next = newlist;
4634 newlist = h;
4635 }
4636 else
4637 {
4638 host_item *hh = newlist;
4639 while (hh->next)
4640 {
4641 if (h->sort_key < hh->next->sort_key) break;
4642 hh = hh->next;
4643 }
4644 h->next = hh->next;
4645 hh->next = h;
4646 }
4647 }
4648
4649 hostlist = addrlist->host_list = newlist;
4650 }
4651
4652 /* Sort out the default port. */
4653
4654 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4655
4656 /* For each host-plus-IP-address on the list:
4657
4658 . If this is a continued delivery and the host isn't the one with the
4659 current connection, skip.
4660
4661 . If the status is unusable (i.e. previously failed or retry checked), skip.
4662
4663 . If no IP address set, get the address, either by turning the name into
4664 an address, calling gethostbyname if gethostbyname is on, or by calling
4665 the DNS. The DNS may yield multiple addresses, in which case insert the
4666 extra ones into the list.
4667
4668 . Get the retry data if not previously obtained for this address and set the
4669 field which remembers the state of this address. Skip if the retry time is
4670 not reached. If not, remember whether retry data was found. The retry string
4671 contains both the name and the IP address.
4672
4673 . Scan the list of addresses and mark those whose status is DEFER as
4674 PENDING_DEFER. These are the only ones that will be processed in this cycle
4675 of the hosts loop.
4676
4677 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4678 Some addresses may be successfully delivered, others may fail, and yet
4679 others may get temporary errors and so get marked DEFER.
4680
4681 . The return from the delivery attempt is OK if a connection was made and a
4682 valid SMTP dialogue was completed. Otherwise it is DEFER.
4683
4684 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4685
4686 . If fail to connect, or other defer state, add a retry item.
4687
4688 . If there are any addresses whose status is still DEFER, carry on to the
4689 next host/IPaddress, unless we have tried the number of hosts given
4690 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4691 there is some fancy logic for hosts_max_try that means its limit can be
4692 overstepped in some circumstances.
4693
4694 If we get to the end of the list, all hosts have deferred at least one address,
4695 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4696 delivery attempt to those hosts whose last try was before the arrival time of
4697 the current message. To cope with this, we have to go round the loop a second
4698 time. After that, set the status and error data for any addresses that haven't
4699 had it set already. */
4700
4701 for (int cutoff_retry = 0;
4702 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4703 cutoff_retry++)
4704 {
4705 host_item *nexthost = NULL;
4706 int unexpired_hosts_tried = 0;
4707 BOOL continue_host_tried = FALSE;
4708
4709 retry_non_continued:
4710 for (host = hostlist;
4711 host
4712 && unexpired_hosts_tried < ob->hosts_max_try
4713 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4714 host = nexthost)
4715 {
4716 int rc;
4717 int host_af;
4718 BOOL host_is_expired = FALSE;
4719 BOOL message_defer = FALSE;
4720 BOOL some_deferred = FALSE;
4721 address_item *first_addr = NULL;
4722 uschar *interface = NULL;
4723 uschar *retry_host_key = NULL;
4724 uschar *retry_message_key = NULL;
4725 uschar *serialize_key = NULL;
4726
4727 /* Default next host is next host. :-) But this can vary if the
4728 hosts_max_try limit is hit (see below). It may also be reset if a host
4729 address is looked up here (in case the host was multihomed). */
4730
4731 nexthost = host->next;
4732
4733 /* If the address hasn't yet been obtained from the host name, look it up
4734 now, unless the host is already marked as unusable. If it is marked as
4735 unusable, it means that the router was unable to find its IP address (in
4736 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4737 the lookup failed last time. We don't get this far if *all* MX records
4738 point to non-existent hosts; that is treated as a hard error.
4739
4740 We can just skip this host entirely. When the hosts came from the router,
4741 the address will timeout based on the other host(s); when the address is
4742 looked up below, there is an explicit retry record added.
4743
4744 Note that we mustn't skip unusable hosts if the address is not unset; they
4745 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4746
4747 if (!host->address)
4748 {
4749 int new_port, flags;
4750
4751 if (host->status >= hstatus_unusable)
4752 {
4753 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4754 host->name);
4755 continue;
4756 }
4757
4758 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4759
4760 /* The host name is permitted to have an attached port. Find it, and
4761 strip it from the name. Just remember it for now. */
4762
4763 new_port = host_item_get_port(host);
4764
4765 /* Count hosts looked up */
4766
4767 hosts_looked_up++;
4768
4769 /* Find by name if so configured, or if it's an IP address. We don't
4770 just copy the IP address, because we need the test-for-local to happen. */
4771
4772 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4773 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4774 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4775
4776 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4777 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4778 else
4779 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4780 &ob->dnssec, /* domains for request/require */
4781 NULL, NULL);
4782
4783 /* Update the host (and any additional blocks, resulting from
4784 multihoming) with a host-specific port, if any. */
4785
4786 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4787
4788 /* Failure to find the host at this time (usually DNS temporary failure)
4789 is really a kind of routing failure rather than a transport failure.
4790 Therefore we add a retry item of the routing kind, not to stop us trying
4791 to look this name up here again, but to ensure the address gets timed
4792 out if the failures go on long enough. A complete failure at this point
4793 commonly points to a configuration error, but the best action is still
4794 to carry on for the next host. */
4795
4796 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4797 {
4798 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4799 expired = FALSE;
4800 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4801 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4802 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4803 host->status = hstatus_unusable;
4804
4805 for (address_item * addr = addrlist; addr; addr = addr->next)
4806 {
4807 if (addr->transport_return != DEFER) continue;
4808 addr->basic_errno = ERRNO_UNKNOWNHOST;
4809 addr->message = string_sprintf(
4810 rc == HOST_FIND_SECURITY
4811 ? "lookup of IP address for %s was insecure"
4812 : "failed to lookup IP address for %s",
4813 host->name);
4814 }
4815 continue;
4816 }
4817
4818 /* If the host is actually the local host, we may have a problem, or
4819 there may be some cunning configuration going on. In the problem case,
4820 log things and give up. The default transport status is already DEFER. */
4821
4822 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4823 {
4824 for (address_item * addr = addrlist; addr; addr = addr->next)
4825 {
4826 addr->basic_errno = 0;
4827 addr->message = string_sprintf("%s transport found host %s to be "
4828 "local", tblock->name, host->name);
4829 }
4830 goto END_TRANSPORT;
4831 }
4832 } /* End of block for IP address lookup */
4833
4834 /* If this is a continued delivery, we are interested only in the host
4835 which matches the name of the existing open channel. The check is put
4836 here after the local host lookup, in case the name gets expanded as a
4837 result of the lookup. Set expired FALSE, to save the outer loop executing
4838 twice. */
4839
4840 if (continue_hostname)
4841 if ( Ustrcmp(continue_hostname, host->name) != 0
4842 || Ustrcmp(continue_host_address, host->address) != 0
4843 )
4844 {
4845 expired = FALSE;
4846 continue; /* With next host */
4847 }
4848 else
4849 continue_host_tried = TRUE;
4850
4851 /* Reset the default next host in case a multihomed host whose addresses
4852 are not looked up till just above added to the host list. */
4853
4854 nexthost = host->next;
4855
4856 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4857 domain is in queue_smtp_domains, we don't actually want to attempt any
4858 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4859 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4860 were not in it. We don't want to hold up all SMTP deliveries! Except when
4861 doing a two-stage queue run, don't do this if forcing. */
4862
4863 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4864 match_isinlist(addrlist->domain,
4865 (const uschar **)&queue_smtp_domains, 0,
4866 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4867 {
4868 expired = FALSE;
4869 for (address_item * addr = addrlist; addr; addr = addr->next)
4870 if (addr->transport_return == DEFER)
4871 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4872 continue; /* With next host */
4873 }
4874
4875 /* Count hosts being considered - purely for an intelligent comment
4876 if none are usable. */
4877
4878 hosts_total++;
4879
4880 /* Set $host and $host address now in case they are needed for the
4881 interface expansion or the serialize_hosts check; they remain set if an
4882 actual delivery happens. */
4883
4884 deliver_host = host->name;
4885 deliver_host_address = host->address;
4886 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4887 : host->dnssec == DS_NO ? US"no"
4888 : US"";
4889
4890 /* Set up a string for adding to the retry key if the port number is not
4891 the standard SMTP port. A host may have its own port setting that overrides
4892 the default. */
4893
4894 pistring = string_sprintf(":%d", host->port == PORT_NONE
4895 ? defport : host->port);
4896 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4897
4898 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4899 string is set, even if constant (as different transports can have different
4900 constant settings), we must add it to the key that is used for retries,
4901 because connections to the same host from a different interface should be
4902 treated separately. */
4903
4904 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4905 {
4906 uschar * s = ob->interface;
4907 if (s && *s)
4908 {
4909 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4910 return FALSE;
4911 pistring = string_sprintf("%s/%s", pistring, interface);
4912 }
4913 }
4914
4915 /* The first time round the outer loop, check the status of the host by
4916 inspecting the retry data. The second time round, we are interested only
4917 in expired hosts that haven't been tried since this message arrived. */
4918
4919 if (cutoff_retry == 0)
4920 {
4921 BOOL incl_ip;
4922 /* Ensure the status of the address is set by checking retry data if
4923 necessary. There may be host-specific retry data (applicable to all
4924 messages) and also data for retries of a specific message at this host.
4925 If either of these retry records are actually read, the keys used are
4926 returned to save recomputing them later. */
4927
4928 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4929 US"retry_include_ip_address", ob->retry_include_ip_address,
4930 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4931 continue; /* with next host */
4932
4933 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4934 incl_ip, &retry_host_key, &retry_message_key);
4935
4936 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4937 host->address ? host->address : US"", pistring,
4938 host->status == hstatus_usable ? "usable"
4939 : host->status == hstatus_unusable ? "unusable"
4940 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4941
4942 /* Skip this address if not usable at this time, noting if it wasn't
4943 actually expired, both locally and in the address. */
4944
4945 switch (host->status)
4946 {
4947 case hstatus_unusable:
4948 expired = FALSE;
4949 setflag(addrlist, af_retry_skipped);
4950 /* Fall through */
4951
4952 case hstatus_unusable_expired:
4953 switch (host->why)
4954 {
4955 case hwhy_retry: hosts_retry++; break;
4956 case hwhy_failed: hosts_fail++; break;
4957 case hwhy_insecure:
4958 case hwhy_deferred: hosts_defer++; break;
4959 }
4960
4961 /* If there was a retry message key, implying that previously there
4962 was a message-specific defer, we don't want to update the list of
4963 messages waiting for these hosts. */
4964
4965 if (retry_message_key) update_waiting = FALSE;
4966 continue; /* With the next host or IP address */
4967 }
4968 }
4969
4970 /* Second time round the loop: if the address is set but expired, and
4971 the message is newer than the last try, let it through. */
4972
4973 else
4974 {
4975 if ( !host->address
4976 || host->status != hstatus_unusable_expired
4977 || host->last_try > received_time.tv_sec)
4978 continue;
4979 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4980 host->name, host->address, pistring);
4981 host_is_expired = TRUE;
4982 }
4983
4984 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4985 it remains TRUE only if all hosts are expired and none are actually tried.
4986 */
4987
4988 expired = FALSE;
4989
4990 /* If this host is listed as one to which access must be serialized,
4991 see if another Exim process has a connection to it, and if so, skip
4992 this host. If not, update the database to record our connection to it
4993 and remember this for later deletion. Do not do any of this if we are
4994 sending the message down a pre-existing connection. */
4995
4996 if ( !continue_hostname
4997 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4998 {
4999 serialize_key = string_sprintf("host-serialize-%s", host->name);
5000 if (!enq_start(serialize_key, 1))
5001 {
5002 DEBUG(D_transport)
5003 debug_printf("skipping host %s because another Exim process "
5004 "is connected to it\n", host->name);
5005 hosts_serial++;
5006 continue;
5007 }
5008 }
5009
5010 /* OK, we have an IP address that is not waiting for its retry time to
5011 arrive (it might be expired) OR (second time round the loop) we have an
5012 expired host that hasn't been tried since the message arrived. Have a go
5013 at delivering the message to it. First prepare the addresses by flushing
5014 out the result of previous attempts, and finding the first address that
5015 is still to be delivered. */
5016
5017 first_addr = prepare_addresses(addrlist, host);
5018
5019 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5020 message_id, host->name, host->address, addrlist->address,
5021 addrlist->next ? ", ..." : "");
5022
5023 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5024 message_id, host->name, host->address, pistring, addrlist->address,
5025 addrlist->next ? ", ..." : "");
5026
5027 /* This is not for real; don't do the delivery. If there are
5028 any remaining hosts, list them. */
5029
5030 if (f.dont_deliver)
5031 {
5032 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5033 for (address_item * addr = addrlist; addr; addr = addr->next)
5034 {
5035 addr->host_used = host;
5036 addr->special_action = '*';
5037 addr->message = US"delivery bypassed by -N option";
5038 }
5039 DEBUG(D_transport)
5040 {
5041 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5042 "*** host and remaining hosts:\n", tblock->name);
5043 for (host_item * host2 = host; host2; host2 = host2->next)
5044 debug_printf(" %s [%s]\n", host2->name,
5045 host2->address ? host2->address : US"unset");
5046 }
5047 rc = OK;
5048 }
5049
5050 /* This is for real. If the host is expired, we don't count it for
5051 hosts_max_retry. This ensures that all hosts must expire before an address
5052 is timed out, unless hosts_max_try_hardlimit (which protects against
5053 lunatic DNS configurations) is reached.
5054
5055 If the host is not expired and we are about to hit the hosts_max_retry
5056 limit, check to see if there is a subsequent hosts with a different MX
5057 value. If so, make that the next host, and don't count this one. This is a
5058 heuristic to make sure that different MXs do get tried. With a normal kind
5059 of retry rule, they would get tried anyway when the earlier hosts were
5060 delayed, but if the domain has a "retry every time" type of rule - as is
5061 often used for the the very large ISPs, that won't happen. */
5062
5063 else
5064 {
5065 host_item * thost;
5066 /* Make a copy of the host if it is local to this invocation
5067 of the transport. */
5068
5069 if (expanded_hosts)
5070 {
5071 thost = store_get(sizeof(host_item));
5072 *thost = *host;
5073 thost->name = string_copy(host->name);
5074 thost->address = string_copy(host->address);
5075 }
5076 else
5077 thost = host;
5078
5079 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5080 {
5081 DEBUG(D_transport)
5082 debug_printf("hosts_max_try limit reached with this host\n");
5083 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5084 {
5085 nexthost = h;
5086 unexpired_hosts_tried--;
5087 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5088 "and will be tried\n");
5089 break;
5090 }
5091 }
5092
5093 /* Attempt the delivery. */
5094
5095 total_hosts_tried++;
5096 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5097 &message_defer, FALSE);
5098
5099 /* Yield is one of:
5100 OK => connection made, each address contains its result;
5101 message_defer is set for message-specific defers (when all
5102 recipients are marked defer)
5103 DEFER => there was a non-message-specific delivery problem;
5104 ERROR => there was a problem setting up the arguments for a filter,
5105 or there was a problem with expanding added headers
5106 */
5107
5108 /* If the result is not OK, there was a non-message-specific problem.
5109 If the result is DEFER, we need to write to the logs saying what happened
5110 for this particular host, except in the case of authentication and TLS
5111 failures, where the log has already been written. If all hosts defer a
5112 general message is written at the end. */
5113
5114 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5115 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5116 write_logs(host, first_addr->message, first_addr->basic_errno);
5117
5118 #ifndef DISABLE_EVENT
5119 if (rc == DEFER)
5120 deferred_event_raise(first_addr, host);
5121 #endif
5122
5123 /* If STARTTLS was accepted, but there was a failure in setting up the
5124 TLS session (usually a certificate screwup), and the host is not in
5125 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5126 TLS forcibly turned off. We have to start from scratch with a new SMTP
5127 connection. That's why the retry is done from here, not from within
5128 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5129 session, so the in-clear transmission after those errors, if permitted,
5130 happens inside smtp_deliver().] */
5131
5132 #ifndef DISABLE_TLS
5133 if ( rc == DEFER
5134 && first_addr->basic_errno == ERRNO_TLSFAILURE
5135 && ob->tls_tempfail_tryclear
5136 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5137 )
5138 {
5139 log_write(0, LOG_MAIN,
5140 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5141 first_addr->message, host->name, host->address);
5142 first_addr = prepare_addresses(addrlist, host);
5143 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5144 &message_defer, TRUE);
5145 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5146 write_logs(host, first_addr->message, first_addr->basic_errno);
5147 # ifndef DISABLE_EVENT
5148 if (rc == DEFER)
5149 deferred_event_raise(first_addr, host);
5150 # endif
5151 }
5152 #endif /*DISABLE_TLS*/
5153 }
5154
5155 /* Delivery attempt finished */
5156
5157 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5158 message_id, host->name, host->address, pistring, addrlist->address,
5159 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5160
5161 /* Release serialization if set up */
5162
5163 if (serialize_key) enq_end(serialize_key);
5164
5165 /* If the result is DEFER, or if a host retry record is known to exist, we
5166 need to add an item to the retry chain for updating the retry database
5167 at the end of delivery. We only need to add the item to the top address,
5168 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5169 for any other delivery attempts using the same address. (It is copied into
5170 the unusable tree at the outer level, so even if different address blocks
5171 contain the same address, it still won't get tried again.) */
5172
5173 if (rc == DEFER || retry_host_key)
5174 {
5175 int delete_flag = rc != DEFER ? rf_delete : 0;
5176 if (!retry_host_key)
5177 {
5178 BOOL incl_ip;
5179 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5180 US"retry_include_ip_address", ob->retry_include_ip_address,
5181 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5182 incl_ip = TRUE; /* error; use most-specific retry record */
5183
5184 retry_host_key = incl_ip
5185 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5186 : string_sprintf("T:%S%s", host->name, pistring);
5187 }
5188
5189 /* If a delivery of another message over an existing SMTP connection
5190 yields DEFER, we do NOT set up retry data for the host. This covers the
5191 case when there are delays in routing the addresses in the second message
5192 that are so long that the server times out. This is alleviated by not
5193 routing addresses that previously had routing defers when handling an
5194 existing connection, but even so, this case may occur (e.g. if a
5195 previously happily routed address starts giving routing defers). If the
5196 host is genuinely down, another non-continued message delivery will
5197 notice it soon enough. */
5198
5199 if (delete_flag != 0 || !continue_hostname)
5200 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5201
5202 /* We may have tried an expired host, if its retry time has come; ensure
5203 the status reflects the expiry for the benefit of any other addresses. */
5204
5205 if (rc == DEFER)
5206 {
5207 host->status = host_is_expired
5208 ? hstatus_unusable_expired : hstatus_unusable;
5209 host->why = hwhy_deferred;
5210 }
5211 }
5212
5213 /* If message_defer is set (host was OK, but every recipient got deferred
5214 because of some message-specific problem), or if that had happened
5215 previously so that a message retry key exists, add an appropriate item
5216 to the retry chain. Note that if there was a message defer but now there is
5217 a host defer, the message defer record gets deleted. That seems perfectly
5218 reasonable. Also, stop the message from being remembered as waiting
5219 for specific hosts. */
5220
5221 if (message_defer || retry_message_key)
5222 {
5223 int delete_flag = message_defer ? 0 : rf_delete;
5224 if (!retry_message_key)
5225 {
5226 BOOL incl_ip;
5227 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5228 US"retry_include_ip_address", ob->retry_include_ip_address,
5229 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5230 incl_ip = TRUE; /* error; use most-specific retry record */
5231
5232 retry_message_key = incl_ip
5233 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5234 message_id)
5235 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5236 }
5237 retry_add_item(addrlist, retry_message_key,
5238 rf_message | rf_host | delete_flag);
5239 update_waiting = FALSE;
5240 }
5241
5242 /* Any return other than DEFER (that is, OK or ERROR) means that the
5243 addresses have got their final statuses filled in for this host. In the OK
5244 case, see if any of them are deferred. */
5245
5246 if (rc == OK)
5247 for (address_item * addr = addrlist; addr; addr = addr->next)
5248 if (addr->transport_return == DEFER)
5249 {
5250 some_deferred = TRUE;
5251 break;
5252 }
5253
5254 /* If no addresses deferred or the result was ERROR, return. We do this for
5255 ERROR because a failing filter set-up or add_headers expansion is likely to
5256 fail for any host we try. */
5257
5258 if (rc == ERROR || (rc == OK && !some_deferred))
5259 {
5260 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5261 return TRUE; /* Each address has its status */
5262 }
5263
5264 /* If the result was DEFER or some individual addresses deferred, let
5265 the loop run to try other hosts with the deferred addresses, except for the
5266 case when we were trying to deliver down an existing channel and failed.
5267 Don't try any other hosts in this case. */
5268
5269 if (continue_hostname) break;
5270
5271 /* If the whole delivery, or some individual addresses, were deferred and
5272 there are more hosts that could be tried, do not count this host towards
5273 the hosts_max_try limit if the age of the message is greater than the
5274 maximum retry time for this host. This means we may try try all hosts,
5275 ignoring the limit, when messages have been around for some time. This is
5276 important because if we don't try all hosts, the address will never time
5277 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5278
5279 if ((rc == DEFER || some_deferred) && nexthost)
5280 {
5281 BOOL timedout;
5282 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5283
5284 if (retry && retry->rules)
5285 {
5286 retry_rule *last_rule;
5287 for (last_rule = retry->rules;
5288 last_rule->next;
5289 last_rule = last_rule->next);
5290 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5291 }
5292 else timedout = TRUE; /* No rule => timed out */
5293
5294 if (timedout)
5295 {
5296 unexpired_hosts_tried--;
5297 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5298 "hosts_max_try (message older than host's retry time)\n");
5299 }
5300 }
5301
5302 DEBUG(D_transport)
5303 {
5304 if (unexpired_hosts_tried >= ob->hosts_max_try)
5305 debug_printf("reached transport hosts_max_try limit %d\n",
5306 ob->hosts_max_try);
5307 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5308 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5309 ob->hosts_max_try_hardlimit);
5310 }
5311
5312 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5313 } /* End of loop for trying multiple hosts. */
5314
5315 /* If we failed to find a matching host in the list, for an already-open
5316 connection, just close it and start over with the list. This can happen
5317 for routing that changes from run to run, or big multi-IP sites with
5318 round-robin DNS. */
5319
5320 if (continue_hostname && !continue_host_tried)
5321 {
5322 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5323
5324 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5325 #ifndef DISABLE_TLS
5326 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5327 transport */
5328 /*XXX doublecheck that! */
5329
5330 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5331 {
5332 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5333 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5334 cutthrough.cctx.tls_ctx = NULL;
5335 cutthrough.is_tls = FALSE;
5336 }
5337 else
5338 #else
5339 (void) write(fd, US"QUIT\r\n", 6);
5340 #endif
5341 (void) close(fd);
5342 cutthrough.cctx.sock = -1;
5343 continue_hostname = NULL;
5344 goto retry_non_continued;
5345 }
5346
5347 /* This is the end of the loop that repeats iff expired is TRUE and
5348 ob->delay_after_cutoff is FALSE. The second time round we will
5349 try those hosts that haven't been tried since the message arrived. */
5350
5351 DEBUG(D_transport)
5352 {
5353 debug_printf("all IP addresses skipped or deferred at least one address\n");
5354 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5355 debug_printf("retrying IP addresses not tried since message arrived\n");
5356 }
5357 }
5358
5359
5360 /* Get here if all IP addresses are skipped or defer at least one address. In
5361 MUA wrapper mode, this will happen only for connection or other non-message-
5362 specific failures. Force the delivery status for all addresses to FAIL. */
5363
5364 if (mua_wrapper)
5365 {
5366 for (address_item * addr = addrlist; addr; addr = addr->next)
5367 addr->transport_return = FAIL;
5368 goto END_TRANSPORT;
5369 }
5370
5371 /* In the normal, non-wrapper case, add a standard message to each deferred
5372 address if there hasn't been an error, that is, if it hasn't actually been
5373 tried this time. The variable "expired" will be FALSE if any deliveries were
5374 actually tried, or if there was at least one host that was not expired. That
5375 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5376 a delivery has been tried, an error code will be set, and the failing of the
5377 message is handled by the retry code later.
5378
5379 If queue_smtp is set, or this transport was called to send a subsequent message
5380 down an existing TCP/IP connection, and something caused the host not to be
5381 found, we end up here, but can detect these cases and handle them specially. */
5382
5383 for (address_item * addr = addrlist; addr; addr = addr->next)
5384 {
5385 /* If host is not NULL, it means that we stopped processing the host list
5386 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5387 means we need to behave as if some hosts were skipped because their retry
5388 time had not come. Specifically, this prevents the address from timing out.
5389 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5390 hosts were tried. */
5391
5392 if (host)
5393 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5394 {
5395 DEBUG(D_transport)
5396 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5397 "hosts were tried\n");
5398 }
5399 else
5400 {
5401 DEBUG(D_transport)
5402 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5403 setflag(addr, af_retry_skipped);
5404 }
5405
5406 if (f.queue_smtp) /* no deliveries attempted */
5407 {
5408 addr->transport_return = DEFER;
5409 addr->basic_errno = 0;
5410 addr->message = US"SMTP delivery explicitly queued";
5411 }
5412
5413 else if ( addr->transport_return == DEFER
5414 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5415 && !addr->message
5416 )
5417 {
5418 addr->basic_errno = ERRNO_HRETRY;
5419 if (continue_hostname)
5420 addr->message = US"no host found for existing SMTP connection";
5421 else if (expired)
5422 {
5423 setflag(addr, af_pass_message); /* This is not a security risk */
5424 addr->message = string_sprintf(
5425 "all hosts%s have been failing for a long time %s",
5426 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5427 ob->delay_after_cutoff
5428 ? US"(and retry time not reached)"
5429 : US"and were last tried after this message arrived");
5430
5431 /* If we are already using fallback hosts, or there are no fallback hosts
5432 defined, convert the result to FAIL to cause a bounce. */
5433
5434 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5435 addr->transport_return = FAIL;
5436 }
5437 else
5438 {
5439 const char * s;
5440 if (hosts_retry == hosts_total)
5441 s = "retry time not reached for any host%s";
5442 else if (hosts_fail == hosts_total)
5443 s = "all host address lookups%s failed permanently";
5444 else if (hosts_defer == hosts_total)
5445 s = "all host address lookups%s failed temporarily";
5446 else if (hosts_serial == hosts_total)
5447 s = "connection limit reached for all hosts%s";
5448 else if (hosts_fail+hosts_defer == hosts_total)
5449 s = "all host address lookups%s failed";
5450 else
5451 s = "some host address lookups failed and retry time "
5452 "not reached for other hosts or connection limit reached%s";
5453
5454 addr->message = string_sprintf(s,
5455 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5456 }
5457 }
5458 }
5459
5460 /* Update the database which keeps information about which messages are waiting
5461 for which hosts to become available. For some message-specific errors, the
5462 update_waiting flag is turned off because we don't want follow-on deliveries in
5463 those cases. If this transport instance is explicitly limited to one message
5464 per connection then follow-on deliveries are not possible and there's no need
5465 to create/update the per-transport wait-<transport_name> database. */
5466
5467 if (update_waiting && tblock->connection_max_messages != 1)
5468 transport_update_waiting(hostlist, tblock->name);
5469
5470 END_TRANSPORT:
5471
5472 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5473
5474 return TRUE; /* Each address has its status */
5475 }
5476
5477 #endif /*!MACRO_PREDEF*/
5478 /* vi: aw ai sw=2
5479 */
5480 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.