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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
13 #endif
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 OPT_OFF(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 LOFF(expand_retry_include_ip_address) },
28
29 { "address_retry_include_sender", opt_bool,
30 LOFF(address_retry_include_sender) },
31 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
32 #ifdef EXPERIMENTAL_ARC
33 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
34 #endif
35 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
36 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
37 { "command_timeout", opt_time, LOFF(command_timeout) },
38 { "connect_timeout", opt_time, LOFF(connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 OPT_OFF(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
43 # endif
44 { "data_timeout", opt_time, LOFF(data_timeout) },
45 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
46 #ifndef DISABLE_DKIM
47 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
49 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
50 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
51 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
55 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
56 #endif
57 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
58 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
60 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
61 { "dscp", opt_stringptr, LOFF(dscp) },
62 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
63 { "final_timeout", opt_time, LOFF(final_timeout) },
64 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
65 { "helo_data", opt_stringptr, LOFF(helo_data) },
66 { "hosts", opt_stringptr, LOFF(hosts) },
67 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
68 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
69 #ifndef DISABLE_TLS
70 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
71 #endif
72 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
73 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
74 #ifndef DISABLE_TLS
75 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
76 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
77 #endif
78 { "hosts_override", opt_bool, LOFF(hosts_override) },
79 #ifndef DISABLE_PIPE_CONNECT
80 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
81 #endif
82 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
83 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
84 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
85 #endif
86 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
87 #ifndef DISABLE_TLS
88 # ifdef SUPPORT_DANE
89 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
90 # endif
91 # ifndef DISABLE_OCSP
92 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
93 # endif
94 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
95 #endif
96 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
97 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
98 #ifdef SUPPORT_DANE
99 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
100 #endif
101 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
102 #ifndef DISABLE_PRDR
103 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
104 #endif
105 #ifndef DISABLE_TLS
106 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
107 #endif
108 { "interface", opt_stringptr, LOFF(interface) },
109 { "keepalive", opt_bool, LOFF(keepalive) },
110 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
111 { "max_rcpt", opt_int | opt_public,
112 OPT_OFF(transport_instance, max_addresses) },
113 { "multi_domain", opt_expand_bool | opt_public,
114 OPT_OFF(transport_instance, multi_domain) },
115 { "port", opt_stringptr, LOFF(port) },
116 { "protocol", opt_stringptr, LOFF(protocol) },
117 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
118 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
119 { "size_addition", opt_int, LOFF(size_addition) },
120 #ifdef SUPPORT_SOCKS
121 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
122 #endif
123 #ifndef DISABLE_TLS
124 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
125 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
126 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
127 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
128 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
129 # ifdef EXPERIMENTAL_TLS_RESUME
130 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
131 # endif
132 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
133 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
134 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
135 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
136 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
137 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
138 #endif
139 #ifdef SUPPORT_I18N
140 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
141 #endif
142 };
143
144 /* Size of the options list. An extern variable has to be used so that its
145 address can appear in the tables drtables.c. */
146
147 int smtp_transport_options_count = nelem(smtp_transport_options);
148
149
150 #ifdef MACRO_PREDEF
151
152 /* Dummy values */
153 smtp_transport_options_block smtp_transport_option_defaults = {0};
154 void smtp_transport_init(transport_instance *tblock) {}
155 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
156 void smtp_transport_closedown(transport_instance *tblock) {}
157
158 #else /*!MACRO_PREDEF*/
159
160
161 /* Default private options block for the smtp transport. */
162
163 smtp_transport_options_block smtp_transport_option_defaults = {
164 .hosts = NULL,
165 .fallback_hosts = NULL,
166 .hostlist = NULL,
167 .fallback_hostlist = NULL,
168 .helo_data = US"$primary_hostname",
169 .interface = NULL,
170 .port = NULL,
171 .protocol = US"smtp",
172 .dscp = NULL,
173 .serialize_hosts = NULL,
174 .hosts_try_auth = NULL,
175 .hosts_require_auth = NULL,
176 .hosts_try_chunking = US"*",
177 #ifdef SUPPORT_DANE
178 .hosts_try_dane = US"*",
179 .hosts_require_dane = NULL,
180 .dane_require_tls_ciphers = NULL,
181 #endif
182 .hosts_try_fastopen = US"*",
183 #ifndef DISABLE_PRDR
184 .hosts_try_prdr = US"*",
185 #endif
186 #ifndef DISABLE_OCSP
187 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
188 .hosts_require_ocsp = NULL,
189 #endif
190 .hosts_require_tls = NULL,
191 .hosts_avoid_tls = NULL,
192 .hosts_verify_avoid_tls = NULL,
193 .hosts_avoid_pipelining = NULL,
194 #ifndef DISABLE_PIPE_CONNECT
195 .hosts_pipe_connect = NULL,
196 #endif
197 .hosts_avoid_esmtp = NULL,
198 #ifndef DISABLE_TLS
199 .hosts_nopass_tls = NULL,
200 .hosts_noproxy_tls = NULL,
201 #endif
202 .command_timeout = 5*60,
203 .connect_timeout = 5*60,
204 .data_timeout = 5*60,
205 .final_timeout = 10*60,
206 .size_addition = 1024,
207 .hosts_max_try = 5,
208 .hosts_max_try_hardlimit = 50,
209 .address_retry_include_sender = TRUE,
210 .allow_localhost = FALSE,
211 .authenticated_sender_force = FALSE,
212 .gethostbyname = FALSE,
213 .dns_qualify_single = TRUE,
214 .dns_search_parents = FALSE,
215 .dnssec = { .request= US"*", .require=NULL },
216 .delay_after_cutoff = TRUE,
217 .hosts_override = FALSE,
218 .hosts_randomize = FALSE,
219 .keepalive = TRUE,
220 .lmtp_ignore_quota = FALSE,
221 .expand_retry_include_ip_address = NULL,
222 .retry_include_ip_address = TRUE,
223 #ifdef SUPPORT_SOCKS
224 .socks_proxy = NULL,
225 #endif
226 #ifndef DISABLE_TLS
227 .tls_certificate = NULL,
228 .tls_crl = NULL,
229 .tls_privatekey = NULL,
230 .tls_require_ciphers = NULL,
231 .tls_sni = NULL,
232 .tls_verify_certificates = US"system",
233 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
234 .tls_tempfail_tryclear = TRUE,
235 # ifdef EXPERIMENTAL_TLS_RESUME
236 .tls_resumption_hosts = NULL,
237 # endif
238 .tls_verify_hosts = NULL,
239 .tls_try_verify_hosts = US"*",
240 .tls_verify_cert_hostnames = US"*",
241 #endif
242 #ifdef SUPPORT_I18N
243 .utf8_downconvert = NULL,
244 #endif
245 #ifndef DISABLE_DKIM
246 .dkim =
247 {.dkim_domain = NULL,
248 .dkim_identity = NULL,
249 .dkim_private_key = NULL,
250 .dkim_selector = NULL,
251 .dkim_canon = NULL,
252 .dkim_sign_headers = NULL,
253 .dkim_strict = NULL,
254 .dkim_hash = US"sha256",
255 .dkim_timestamps = NULL,
256 .dot_stuffed = FALSE,
257 .force_bodyhash = FALSE,
258 # ifdef EXPERIMENTAL_ARC
259 .arc_signspec = NULL,
260 # endif
261 },
262 # ifdef EXPERIMENTAL_ARC
263 .arc_sign = NULL,
264 # endif
265 #endif
266 };
267
268 /* some DSN flags for use later */
269
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
274
275
276
277 /* Local statics */
278
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
282 static BOOL update_waiting; /* TRUE to update the "wait" database */
283
284 /*XXX move to smtp_context */
285 static BOOL pipelining_active; /* current transaction is in pipe mode */
286
287
288 static unsigned ehlo_response(uschar * buf, unsigned checks);
289
290
291 /******************************************************************************/
292
293 void
294 smtp_deliver_init(void)
295 {
296 if (!regex_PIPELINING) regex_PIPELINING =
297 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
298
299 if (!regex_SIZE) regex_SIZE =
300 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
301
302 if (!regex_AUTH) regex_AUTH =
303 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
304
305 #ifndef DISABLE_TLS
306 if (!regex_STARTTLS) regex_STARTTLS =
307 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
308 #endif
309
310 if (!regex_CHUNKING) regex_CHUNKING =
311 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
312
313 #ifndef DISABLE_PRDR
314 if (!regex_PRDR) regex_PRDR =
315 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
316 #endif
317
318 #ifdef SUPPORT_I18N
319 if (!regex_UTF8) regex_UTF8 =
320 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
321 #endif
322
323 if (!regex_DSN) regex_DSN =
324 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
325
326 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
327 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
328
329 #ifndef DISABLE_PIPE_CONNECT
330 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
331 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
332 #endif
333 }
334
335
336 /*************************************************
337 * Setup entry point *
338 *************************************************/
339
340 /* This function is called when the transport is about to be used,
341 but before running it in a sub-process. It is used for two things:
342
343 (1) To set the fallback host list in addresses, when delivering.
344 (2) To pass back the interface, port, protocol, and other options, for use
345 during callout verification.
346
347 Arguments:
348 tblock pointer to the transport instance block
349 addrlist list of addresses about to be transported
350 tf if not NULL, pointer to block in which to return options
351 uid the uid that will be set (not used)
352 gid the gid that will be set (not used)
353 errmsg place for error message (not used)
354
355 Returns: OK always (FAIL, DEFER not used)
356 */
357
358 static int
359 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
360 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
361 {
362 smtp_transport_options_block *ob = SOB tblock->options_block;
363
364 errmsg = errmsg; /* Keep picky compilers happy */
365 uid = uid;
366 gid = gid;
367
368 /* Pass back options if required. This interface is getting very messy. */
369
370 if (tf)
371 {
372 tf->interface = ob->interface;
373 tf->port = ob->port;
374 tf->protocol = ob->protocol;
375 tf->hosts = ob->hosts;
376 tf->hosts_override = ob->hosts_override;
377 tf->hosts_randomize = ob->hosts_randomize;
378 tf->gethostbyname = ob->gethostbyname;
379 tf->qualify_single = ob->dns_qualify_single;
380 tf->search_parents = ob->dns_search_parents;
381 tf->helo_data = ob->helo_data;
382 }
383
384 /* Set the fallback host list for all the addresses that don't have fallback
385 host lists, provided that the local host wasn't present in the original host
386 list. */
387
388 if (!testflag(addrlist, af_local_host_removed))
389 for (; addrlist; addrlist = addrlist->next)
390 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
391
392 return OK;
393 }
394
395
396
397 /*************************************************
398 * Initialization entry point *
399 *************************************************/
400
401 /* Called for each instance, after its options have been read, to
402 enable consistency checks to be done, or anything else that needs
403 to be set up.
404
405 Argument: pointer to the transport instance block
406 Returns: nothing
407 */
408
409 void
410 smtp_transport_init(transport_instance *tblock)
411 {
412 smtp_transport_options_block *ob = SOB tblock->options_block;
413
414 /* Retry_use_local_part defaults FALSE if unset */
415
416 if (tblock->retry_use_local_part == TRUE_UNSET)
417 tblock->retry_use_local_part = FALSE;
418
419 /* Set the default port according to the protocol */
420
421 if (!ob->port)
422 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
423 ? US"lmtp"
424 : strcmpic(ob->protocol, US"smtps") == 0
425 ? US"smtps" : US"smtp";
426
427 /* Set up the setup entry point, to be called before subprocesses for this
428 transport. */
429
430 tblock->setup = smtp_transport_setup;
431
432 /* Complain if any of the timeouts are zero. */
433
434 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
435 ob->final_timeout <= 0)
436 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
437 "command, data, or final timeout value is zero for %s transport",
438 tblock->name);
439
440 /* If hosts_override is set and there are local hosts, set the global
441 flag that stops verify from showing router hosts. */
442
443 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
444
445 /* If there are any fallback hosts listed, build a chain of host items
446 for them, but do not do any lookups at this time. */
447
448 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
449 }
450
451
452
453
454
455 /*************************************************
456 * Set delivery info into all active addresses *
457 *************************************************/
458
459 /* Only addresses whose status is >= PENDING are relevant. A lesser
460 status means that an address is not currently being processed.
461
462 Arguments:
463 addrlist points to a chain of addresses
464 errno_value to put in each address's errno field
465 msg to put in each address's message field
466 rc to put in each address's transport_return field
467 pass_message if TRUE, set the "pass message" flag in the address
468 host if set, mark addrs as having used this host
469 smtp_greeting from peer
470 helo_response from peer
471 start points to timestamp of delivery start
472
473 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
474 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
475 this particular type of timeout.
476
477 Returns: nothing
478 */
479
480 static void
481 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
482 BOOL pass_message, host_item * host,
483 #ifdef EXPERIMENTAL_DSN_INFO
484 const uschar * smtp_greeting, const uschar * helo_response,
485 #endif
486 struct timeval * start
487 )
488 {
489 int orvalue = 0;
490 struct timeval deliver_time;
491
492 if (errno_value == ERRNO_CONNECTTIMEOUT)
493 {
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
496 }
497 timesince(&deliver_time, start);
498
499 for (address_item * addr = addrlist; addr; addr = addr->next)
500 if (addr->transport_return >= PENDING)
501 {
502 addr->basic_errno = errno_value;
503 addr->more_errno |= orvalue;
504 addr->delivery_time = deliver_time;
505 if (msg)
506 {
507 addr->message = msg;
508 if (pass_message) setflag(addr, af_pass_message);
509 }
510 addr->transport_return = rc;
511 if (host)
512 {
513 addr->host_used = host;
514 #ifdef EXPERIMENTAL_DSN_INFO
515 if (smtp_greeting)
516 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
517 addr->smtp_greeting = smtp_greeting;
518
519 if (helo_response)
520 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
521 addr->helo_response = helo_response;
522 #endif
523 }
524 }
525 }
526
527 static void
528 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
529 BOOL pass_message, struct timeval * start)
530 {
531 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
532 #ifdef EXPERIMENTAL_DSN_INFO
533 NULL, NULL,
534 #endif
535 start);
536 }
537
538
539 /*************************************************
540 * Check an SMTP response *
541 *************************************************/
542
543 /* This function is given an errno code and the SMTP response buffer
544 to analyse, together with the host identification for generating messages. It
545 sets an appropriate message and puts the first digit of the response code into
546 the yield variable. If no response was actually read, a suitable digit is
547 chosen.
548
549 Arguments:
550 host the current host, to get its name for messages
551 errno_value pointer to the errno value
552 more_errno from the top address for use with ERRNO_FILTER_FAIL
553 buffer the SMTP response buffer
554 yield where to put a one-digit SMTP response code
555 message where to put an error message
556 pass_message set TRUE if message is an SMTP response
557
558 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
559 */
560
561 static BOOL
562 check_response(host_item *host, int *errno_value, int more_errno,
563 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
564 {
565 uschar * pl = pipelining_active ? US"pipelined " : US"";
566 const uschar * s;
567
568 *yield = '4'; /* Default setting is to give a temporary error */
569
570 switch(*errno_value)
571 {
572 case ETIMEDOUT: /* Handle response timeout */
573 *message = US string_sprintf("SMTP timeout after %s%s",
574 pl, smtp_command);
575 if (transport_count > 0)
576 *message = US string_sprintf("%s (%d bytes written)", *message,
577 transport_count);
578 return FALSE;
579
580 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
581 s = string_printing(buffer);
582 while (isspace(*s)) s++;
583 *message = *s == 0
584 ? string_sprintf("Malformed SMTP reply (an empty line) "
585 "in response to %s%s", pl, smtp_command)
586 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
587 pl, smtp_command, s);
588 return FALSE;
589
590 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
591 GnuTLS and TLS1.3 */
592 *message = US"bad first read from TLS conn";
593 return TRUE;
594
595 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
596 can't send QUIT as we mustn't end the DATA. */
597 *message = string_sprintf("transport filter process failed (%d)%s",
598 more_errno,
599 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
600 return FALSE;
601
602 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
603 can't send QUIT as we mustn't end the DATA. */
604 *message =
605 string_sprintf("failed to expand headers_add or headers_remove: %s",
606 expand_string_message);
607 return FALSE;
608
609 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
610 *message = US"failed to write a data block";
611 return FALSE;
612
613 #ifdef SUPPORT_I18N
614 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
615 *message = US"utf8 support required but not offered for forwarding";
616 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
617 return TRUE;
618 #endif
619 }
620
621 /* Handle error responses from the remote mailer. */
622
623 if (buffer[0] != 0)
624 {
625 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
626 "%s", pl, smtp_command, s = string_printing(buffer));
627 *pass_message = TRUE;
628 *yield = buffer[0];
629 return TRUE;
630 }
631
632 /* No data was read. If there is no errno, this must be the EOF (i.e.
633 connection closed) case, which causes deferral. An explicit connection reset
634 error has the same effect. Otherwise, put the host's identity in the message,
635 leaving the errno value to be interpreted as well. In all cases, we have to
636 assume the connection is now dead. */
637
638 if (*errno_value == 0 || *errno_value == ECONNRESET)
639 {
640 *errno_value = ERRNO_SMTPCLOSED;
641 *message = US string_sprintf("Remote host closed connection "
642 "in response to %s%s", pl, smtp_command);
643 }
644 else
645 *message = US string_sprintf("%s [%s]", host->name, host->address);
646
647 return FALSE;
648 }
649
650
651
652 /*************************************************
653 * Write error message to logs *
654 *************************************************/
655
656 /* This writes to the main log and to the message log.
657
658 Arguments:
659 host the current host
660 detail the current message (addr_item->message)
661 basic_errno the errno (addr_item->basic_errno)
662
663 Returns: nothing
664 */
665
666 static void
667 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
668 {
669 gstring * message = LOGGING(outgoing_port)
670 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
671 host->port == PORT_NONE ? 25 : host->port)
672 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
673
674 if (suffix)
675 {
676 message = string_fmt_append(message, ": %s", suffix);
677 if (basic_errno > 0)
678 message = string_fmt_append(message, ": %s", strerror(basic_errno));
679 }
680 else
681 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
682
683 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
684 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
685 }
686
687 static void
688 msglog_line(host_item * host, uschar * message)
689 {
690 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
691 host->name, host->address, message);
692 }
693
694
695
696 #ifndef DISABLE_EVENT
697 /*************************************************
698 * Post-defer action *
699 *************************************************/
700
701 /* This expands an arbitrary per-transport string.
702 It might, for example, be used to write to the database log.
703
704 Arguments:
705 addr the address item containing error information
706 host the current host
707 evstr the event
708
709 Returns: nothing
710 */
711
712 static void
713 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
714 {
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
717 uschar * save_local;
718
719 if (!action)
720 return;
721
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
724
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
729
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
734
735 (void) event_raise(action, evstr,
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
747 }
748 #endif
749
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
753 static int
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756 {
757 uschar flushbuffer[4096];
758
759 while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766 return count;
767 }
768
769
770 /* Return boolean success */
771
772 static BOOL
773 smtp_reap_banner(smtp_context * sx)
774 {
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
779 #endif
780 return good_response;
781 }
782
783 static BOOL
784 smtp_reap_ehlo(smtp_context * sx)
785 {
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793 #endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
800 #endif
801 #ifndef DISABLE_EVENT
802 (void) event_raise(sx->conn_args.tblock->event_action,
803 US"smtp:ehlo", sx->buffer);
804 #endif
805 return TRUE;
806 }
807
808
809
810 #ifndef DISABLE_PIPE_CONNECT
811 static uschar *
812 ehlo_cache_key(const smtp_context * sx)
813 {
814 host_item * host = sx->conn_args.host;
815 return Ustrchr(host->address, ':')
816 ? string_sprintf("[%s]:%d.EHLO", host->address,
817 host->port == PORT_NONE ? sx->port : host->port)
818 : string_sprintf("%s:%d.EHLO", host->address,
819 host->port == PORT_NONE ? sx->port : host->port);
820 }
821
822 static void
823 write_ehlo_cache_entry(const smtp_context * sx)
824 {
825 open_db dbblock, * dbm_file;
826
827 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
828 {
829 uschar * ehlo_resp_key = ehlo_cache_key(sx);
830 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
831
832 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
833 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
834 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
835
836 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
837 dbfn_close(dbm_file);
838 }
839 }
840
841 static void
842 invalidate_ehlo_cache_entry(smtp_context * sx)
843 {
844 open_db dbblock, * dbm_file;
845
846 if ( sx->early_pipe_active
847 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
848 {
849 uschar * ehlo_resp_key = ehlo_cache_key(sx);
850 dbfn_delete(dbm_file, ehlo_resp_key);
851 dbfn_close(dbm_file);
852 }
853 }
854
855 static BOOL
856 read_ehlo_cache_entry(smtp_context * sx)
857 {
858 open_db dbblock;
859 open_db * dbm_file;
860
861 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
862 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
863 else
864 {
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbdata_ehlo_resp * er;
867
868 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
869 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
870 else if (time(NULL) - er->time_stamp > retry_data_expire)
871 {
872 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
873 dbfn_close(dbm_file);
874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
875 dbfn_delete(dbm_file, ehlo_resp_key);
876 }
877 else
878 {
879 sx->ehlo_resp = er->data;
880 dbfn_close(dbm_file);
881 DEBUG(D_transport) debug_printf(
882 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
883 er->data.cleartext_features, er->data.cleartext_auths,
884 er->data.crypted_features, er->data.crypted_auths);
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889 return FALSE;
890 }
891
892
893
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
896
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
899 {
900 uschar * names;
901 auth_instance * au;
902 uschar authnum;
903 unsigned short authbits = 0;
904
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922 DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928 else
929 sx->ehlo_resp.cleartext_auths = authbits;
930 return authbits;
931 }
932
933
934
935
936 /* Wait for and check responses for early-pipelining.
937
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
942
943 Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947 Return:
948 OK all well
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
951 */
952 int
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 {
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
957 int rc = FAIL;
958
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
961
962 if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
970 goto fail;
971 }
972 }
973
974 if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017 return OK;
1018
1019 fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1022 return rc;
1023 }
1024 #endif
1025
1026
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1030
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1036 of code.
1037
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1042
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1051
1052 Arguments:
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1058
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1068 */
1069
1070 static int
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 {
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1075 int yield = 0;
1076
1077 #ifndef DISABLE_PIPE_CONNECT
1078 int rc;
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1081 #endif
1082
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1086
1087 if (sx->pending_MAIL)
1088 {
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 count--;
1091 sx->pending_MAIL = FALSE;
1092 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1093 '2', ob->command_timeout))
1094 {
1095 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1096 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1097 if (errno == ERRNO_TLSFAILURE)
1098 return -5;
1099 if (errno == 0 && sx->buffer[0] != 0)
1100 {
1101 int save_errno = 0;
1102 if (sx->buffer[0] == '4')
1103 {
1104 save_errno = ERRNO_MAIL4XX;
1105 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1106 }
1107 count = smtp_discard_responses(sx, ob, count);
1108 errno = save_errno;
1109 }
1110
1111 if (pending_DATA) count--; /* Number of RCPT responses to come */
1112 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 {
1114 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1115 addr->host_used = sx->conn_args.host;
1116 addr = addr->next;
1117 }
1118 return -3;
1119 }
1120 }
1121
1122 if (pending_DATA) count--; /* Number of RCPT responses to come */
1123
1124 /* Read and handle the required number of RCPT responses, matching each one up
1125 with an address by scanning for the next address whose status is PENDING_DEFER.
1126 */
1127
1128 while (count-- > 0)
1129 {
1130 while (addr->transport_return != PENDING_DEFER)
1131 if (!(addr = addr->next))
1132 return -2;
1133
1134 /* The address was accepted */
1135 addr->host_used = sx->conn_args.host;
1136
1137 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1138 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1139 '2', ob->command_timeout))
1140 {
1141 yield |= 1;
1142 addr->transport_return = PENDING_OK;
1143
1144 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1145 ensure that any address-specific retry record is expunged. We do this both
1146 for the basic key and for the version that also includes the sender. */
1147
1148 if (testflag(addr, af_dr_retry_exists))
1149 {
1150 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 sender_address);
1152 retry_add_item(addr, altkey, rf_delete);
1153 retry_add_item(addr, addr->address_retry_key, rf_delete);
1154 }
1155 }
1156
1157 /* Error on first TLS read */
1158
1159 else if (errno == ERRNO_TLSFAILURE)
1160 return -5;
1161
1162 /* Timeout while reading the response */
1163
1164 else if (errno == ETIMEDOUT)
1165 {
1166 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1167 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1168 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1169 retry_add_item(addr, addr->address_retry_key, 0);
1170 update_waiting = FALSE;
1171 return -1;
1172 }
1173
1174 /* Handle other errors in obtaining an SMTP response by returning -1. This
1175 will cause all the addresses to be deferred. Restore the SMTP command in
1176 big_buffer for which we are checking the response, so the error message
1177 makes sense. */
1178
1179 else if (errno != 0 || sx->buffer[0] == 0)
1180 {
1181 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1182
1183 /* Use taint-unchecked routines for writing into big_buffer, trusting
1184 that we'll never expand it. */
1185
1186 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1187 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1188 string_from_gstring(g);
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 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1227 start point for another MAIL command. */
1228
1229 if (addr->more_errno >> 8 == 52 && yield & 3)
1230 {
1231 if (!sx->RCPT_452)
1232 {
1233 DEBUG(D_transport)
1234 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1235 sx->RCPT_452 = TRUE;
1236 sx->next_addr = addr;
1237 }
1238 addr->transport_return = PENDING_DEFER;
1239 addr->basic_errno = 0;
1240 }
1241 else
1242 {
1243 /* Log temporary errors if there are more hosts to be tried.
1244 If not, log this last one in the == line. */
1245
1246 if (sx->conn_args.host->next)
1247 if (LOGGING(outgoing_port))
1248 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1249 sx->conn_args.host->address,
1250 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1251 else
1252 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1253 sx->conn_args.host->address, addr->message);
1254
1255 #ifndef DISABLE_EVENT
1256 else
1257 msg_event_raise(US"msg:rcpt:defer", addr);
1258 #endif
1259
1260 /* Do not put this message on the list of those waiting for specific
1261 hosts, as otherwise it is likely to be tried too often. */
1262
1263 update_waiting = FALSE;
1264
1265 /* Add a retry item for the address so that it doesn't get tried again
1266 too soon. If address_retry_include_sender is true, add the sender address
1267 to the retry key. */
1268
1269 retry_add_item(addr,
1270 ob->address_retry_include_sender
1271 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1272 : addr->address_retry_key,
1273 0);
1274 }
1275 }
1276 }
1277 }
1278 } /* Loop for next RCPT response */
1279
1280 /* Update where to start at for the next block of responses, unless we
1281 have already handled all the addresses. */
1282
1283 if (addr) sx->sync_addr = addr->next;
1284
1285 /* Handle a response to DATA. If we have not had any good recipients, either
1286 previously or in this block, the response is ignored. */
1287
1288 if (pending_DATA != 0)
1289 {
1290 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1291 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1292 '3', ob->command_timeout))
1293 {
1294 int code;
1295 uschar *msg;
1296 BOOL pass_message;
1297
1298 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1299 return -5;
1300
1301 if (pending_DATA > 0 || (yield & 1) != 0)
1302 {
1303 if (errno == 0 && sx->buffer[0] == '4')
1304 {
1305 errno = ERRNO_DATA4XX;
1306 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1307 }
1308 return -3;
1309 }
1310 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1311 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1312 "is in use and there were no good recipients\n", msg);
1313 }
1314 }
1315
1316 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1317 present) received 3xx. If any RCPTs were handled and yielded anything other
1318 than 4xx, yield will be set non-zero. */
1319
1320 return yield;
1321 }
1322
1323
1324
1325
1326
1327 /* Try an authenticator's client entry */
1328
1329 static int
1330 try_authenticator(smtp_context * sx, auth_instance * au)
1331 {
1332 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1333 host_item * host = sx->conn_args.host; /* host to deliver to */
1334 int rc;
1335
1336 sx->outblock.authenticating = TRUE;
1337 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1338 sx->buffer, sizeof(sx->buffer));
1339 sx->outblock.authenticating = FALSE;
1340 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1341
1342 /* A temporary authentication failure must hold up delivery to
1343 this host. After a permanent authentication failure, we carry on
1344 to try other authentication methods. If all fail hard, try to
1345 deliver the message unauthenticated unless require_auth was set. */
1346
1347 switch(rc)
1348 {
1349 case OK:
1350 f.smtp_authenticated = TRUE; /* stops the outer loop */
1351 client_authenticator = au->name;
1352 if (au->set_client_id)
1353 client_authenticated_id = expand_string(au->set_client_id);
1354 break;
1355
1356 /* Failure after writing a command */
1357
1358 case FAIL_SEND:
1359 return FAIL_SEND;
1360
1361 /* Failure after reading a response */
1362
1363 case FAIL:
1364 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1365 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1366 au->name, host->name, host->address, sx->buffer);
1367 break;
1368
1369 /* Failure by some other means. In effect, the authenticator
1370 decided it wasn't prepared to handle this case. Typically this
1371 is the result of "fail" in an expansion string. Do we need to
1372 log anything here? Feb 2006: a message is now put in the buffer
1373 if logging is required. */
1374
1375 case CANCELLED:
1376 if (*sx->buffer != 0)
1377 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1378 "authentication H=%s [%s] %s", au->name, host->name,
1379 host->address, sx->buffer);
1380 break;
1381
1382 /* Internal problem, message in buffer. */
1383
1384 case ERROR:
1385 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1386 DEFER, FALSE, &sx->delivery_start);
1387 return ERROR;
1388 }
1389 return OK;
1390 }
1391
1392
1393
1394
1395 /* Do the client side of smtp-level authentication.
1396
1397 Arguments:
1398 sx smtp connection context
1399
1400 sx->buffer should have the EHLO response from server (gets overwritten)
1401
1402 Returns:
1403 OK Success, or failed (but not required): global "smtp_authenticated" set
1404 DEFER Failed authentication (and was required)
1405 ERROR Internal problem
1406
1407 FAIL_SEND Failed communications - transmit
1408 FAIL - response
1409 */
1410
1411 static int
1412 smtp_auth(smtp_context * sx)
1413 {
1414 host_item * host = sx->conn_args.host; /* host to deliver to */
1415 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1416 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1417 #ifndef DISABLE_PIPE_CONNECT
1418 unsigned short authbits = tls_out.active.sock >= 0
1419 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1420 #endif
1421 uschar * fail_reason = US"server did not advertise AUTH support";
1422
1423 f.smtp_authenticated = FALSE;
1424 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1425
1426 if (!regex_AUTH)
1427 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1428
1429 /* Is the server offering AUTH? */
1430
1431 if ( sx->esmtp
1432 &&
1433 #ifndef DISABLE_PIPE_CONNECT
1434 sx->early_pipe_active ? authbits
1435 :
1436 #endif
1437 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1438 )
1439 {
1440 uschar * names = NULL;
1441 expand_nmax = -1; /* reset */
1442
1443 #ifndef DISABLE_PIPE_CONNECT
1444 if (!sx->early_pipe_active)
1445 #endif
1446 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1447
1448 /* Must not do this check until after we have saved the result of the
1449 regex match above as the check could be another RE. */
1450
1451 if ( require_auth == OK
1452 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1453 {
1454 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1455 fail_reason = US"no common mechanisms were found";
1456
1457 #ifndef DISABLE_PIPE_CONNECT
1458 if (sx->early_pipe_active)
1459 {
1460 /* Scan our authenticators (which support use by a client and were offered
1461 by the server (checked at cache-write time)), not suppressed by
1462 client_condition. If one is found, attempt to authenticate by calling its
1463 client function. We are limited to supporting up to 16 authenticator
1464 public-names by the number of bits in a short. */
1465
1466 auth_instance * au;
1467 uschar bitnum;
1468 int rc;
1469
1470 for (bitnum = 0, au = auths;
1471 !f.smtp_authenticated && au && bitnum < 16;
1472 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1473 {
1474 if ( au->client_condition
1475 && !expand_check_condition(au->client_condition, au->name,
1476 US"client authenticator"))
1477 {
1478 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1479 au->name, "client_condition is false");
1480 continue;
1481 }
1482
1483 /* Found data for a listed mechanism. Call its client entry. Set
1484 a flag in the outblock so that data is overwritten after sending so
1485 that reflections don't show it. */
1486
1487 fail_reason = US"authentication attempt(s) failed";
1488
1489 if ((rc = try_authenticator(sx, au)) != OK)
1490 return rc;
1491 }
1492 }
1493 else
1494 #endif
1495
1496 /* Scan the configured authenticators looking for one which is configured
1497 for use as a client, which is not suppressed by client_condition, and
1498 whose name matches an authentication mechanism supported by the server.
1499 If one is found, attempt to authenticate by calling its client function.
1500 */
1501
1502 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1503 {
1504 uschar *p = names;
1505
1506 if ( !au->client
1507 || ( au->client_condition
1508 && !expand_check_condition(au->client_condition, au->name,
1509 US"client authenticator")))
1510 {
1511 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1512 au->name,
1513 (au->client)? "client_condition is false" :
1514 "not configured as a client");
1515 continue;
1516 }
1517
1518 /* Loop to scan supported server mechanisms */
1519
1520 while (*p)
1521 {
1522 int len = Ustrlen(au->public_name);
1523 int rc;
1524
1525 while (isspace(*p)) p++;
1526
1527 if (strncmpic(au->public_name, p, len) != 0 ||
1528 (p[len] != 0 && !isspace(p[len])))
1529 {
1530 while (*p != 0 && !isspace(*p)) p++;
1531 continue;
1532 }
1533
1534 /* Found data for a listed mechanism. Call its client entry. Set
1535 a flag in the outblock so that data is overwritten after sending so
1536 that reflections don't show it. */
1537
1538 fail_reason = US"authentication attempt(s) failed";
1539
1540 if ((rc = try_authenticator(sx, au)) != OK)
1541 return rc;
1542
1543 break; /* If not authenticated, try next authenticator */
1544 } /* Loop for scanning supported server mechanisms */
1545 } /* Loop for further authenticators */
1546 }
1547 }
1548
1549 /* If we haven't authenticated, but are required to, give up. */
1550
1551 if (require_auth == OK && !f.smtp_authenticated)
1552 {
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1556 return DEFER;
1557 }
1558
1559 return OK;
1560 }
1561
1562
1563 /* Construct AUTH appendix string for MAIL TO */
1564 /*
1565 Arguments
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1569
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1573 */
1574
1575 static BOOL
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1577 {
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1580
1581 #ifdef notdef
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1584 #endif
1585
1586 if (ob->authenticated_sender)
1587 {
1588 uschar * new = expand_string(ob->authenticated_sender);
1589 if (!new)
1590 {
1591 if (!f.expand_string_forcedfail)
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1596 return TRUE;
1597 }
1598 }
1599 else if (*new)
1600 local_authenticated_sender = new;
1601 }
1602
1603 /* Add the authenticated sender address if present */
1604
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1607 {
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613 else
1614 *p = 0;
1615
1616 return FALSE;
1617 }
1618
1619
1620
1621 typedef struct smtp_compare_s
1622 {
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625 } smtp_compare_t;
1626
1627
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1630 */
1631
1632 static uschar *
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634 {
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1638 #ifndef DISABLE_TLS
1639 uschar * tlsc1 = US"";
1640 #endif
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1644
1645 sender_address = sender;
1646
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1649
1650 if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653 if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
1656 #ifndef DISABLE_TLS
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660 #else
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1662 #endif
1663
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1666
1667 return local_identity;
1668 }
1669
1670
1671
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1676
1677 static BOOL
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679 {
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1686
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1688 return 0;
1689
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1692
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694 }
1695
1696
1697
1698 static unsigned
1699 ehlo_response(uschar * buf, unsigned checks)
1700 {
1701 size_t bsize = Ustrlen(buf);
1702
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1704
1705 #ifndef DISABLE_TLS
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1708 #endif
1709 checks &= ~OPTION_TLS;
1710
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1715
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1719
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1723 #endif
1724 checks &= ~OPTION_PRDR;
1725
1726 #ifdef SUPPORT_I18N
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1729 #endif
1730 checks &= ~OPTION_UTF8;
1731
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1735
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1740
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1744
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749 #endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1753 return checks;
1754 }
1755
1756
1757
1758 /* Callback for emitting a BDAT data chunk header.
1759
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1762
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1765
1766 Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1772
1773 Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
1776 */
1777
1778 static int
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
1781 {
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1784 int cmd_count = 0;
1785 int prev_cmd_count;
1786
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1789
1790 if (chunk_size > 0)
1791 {
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794 #endif
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808 #endif
1809 }
1810
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1812
1813 /* Reap responses for any previous, but not one we just emitted */
1814
1815 if (chunk_size > 0)
1816 prev_cmd_count--;
1817 if (sx->pending_BDAT)
1818 prev_cmd_count--;
1819
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1821 {
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1824
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1826 {
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836 #endif
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1843 }
1844
1845 /* Reap response for an outstanding BDAT */
1846
1847 if (sx->pending_BDAT)
1848 {
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1853 {
1854 if (errno == 0 && sx->buffer[0] == '4')
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1865 }
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1868
1869
1870 sx->cmd_count = cmd_count;
1871 return OK;
1872 }
1873
1874
1875
1876
1877
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1881
1882 /*
1883 Arguments:
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1887
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896 */
1897 int
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1899 {
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1903 int yield = OK;
1904 #ifndef DISABLE_TLS
1905 uschar * tls_errstr;
1906 #endif
1907
1908 sx->conn_args.ob = ob;
1909
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1916 sx->esmtp = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1918 #ifdef SUPPORT_I18N
1919 /* sx->utf8_needed = FALSE; */
1920 #endif
1921 sx->dsn_all_lasthop = TRUE;
1922 #ifdef SUPPORT_DANE
1923 /* sx->conn_args.dane = FALSE; */
1924 sx->dane_required =
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926 #endif
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1931 #endif
1932
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1941 #endif
1942
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1945
1946 /* Set up the buffer for reading SMTP response packets. */
1947
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1952
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1954
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1961
1962 /* Reset the parameters of a TLS session. */
1963
1964 tls_out.bits = 0;
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1969 #ifdef USE_OPENSSL
1970 tls_out.sni = NULL;
1971 #endif
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1975 #endif
1976 tls_out.ver = NULL;
1977
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1982
1983 tls_modify_variables(&tls_out);
1984
1985 #ifdef DISABLE_TLS
1986 if (sx->smtps)
1987 {
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1990 return ERROR;
1991 }
1992 #endif
1993
1994 /* Make a connection to the host if this isn't a continued delivery, and handle
1995 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996 specially so they can be identified for retries. */
1997
1998 if (!continue_hostname)
1999 {
2000 if (sx->verify)
2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2002
2003 /* Get the actual port the connection will use, into sx->conn_args.host */
2004
2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
2006
2007 #ifdef SUPPORT_DANE
2008 /* Do TLSA lookup for DANE */
2009 {
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
2013 if (sx->conn_args.host->dnssec == DS_YES)
2014 {
2015 int rc;
2016 if( sx->dane_required
2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2018 )
2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2020 {
2021 case OK: sx->conn_args.dane = TRUE;
2022 ob->tls_tempfail_tryclear = FALSE;
2023 break;
2024 case FAIL_FORCED: break;
2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2026 string_sprintf("DANE error: tlsa lookup %s",
2027 rc_to_string(rc)),
2028 rc, FALSE, &sx->delivery_start);
2029 # ifndef DISABLE_EVENT
2030 (void) event_raise(sx->conn_args.tblock->event_action,
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
2033 # endif
2034 return rc;
2035 }
2036 }
2037 else if (sx->dane_required)
2038 {
2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2041 FAIL, FALSE, &sx->delivery_start);
2042 # ifndef DISABLE_EVENT
2043 (void) event_raise(sx->conn_args.tblock->event_action,
2044 US"dane:fail", US"dane-required");
2045 # endif
2046 return FAIL;
2047 }
2048 }
2049 #endif /*DANE*/
2050
2051 /* Make the TCP connection */
2052
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2056
2057 #ifndef DISABLE_PIPE_CONNECT
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
2068 {
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
2078 }
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
2081
2082 if (sx->early_pipe_active)
2083 sx->outblock.conn_args = &sx->conn_args;
2084 else
2085 #endif
2086 {
2087 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2088 {
2089 set_errno_nohost(sx->addrlist,
2090 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2091 sx->verify ? US strerror(errno) : NULL,
2092 DEFER, FALSE, &sx->delivery_start);
2093 sx->send_quit = FALSE;
2094 return DEFER;
2095 }
2096 }
2097 /* Expand the greeting message while waiting for the initial response. (Makes
2098 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2099 delayed till here so that $sending_interface and $sending_port are set. */
2100 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2101 will be? Somehow I doubt it. */
2102
2103 if (sx->helo_data)
2104 if (!(sx->helo_data = expand_string(sx->helo_data)))
2105 if (sx->verify)
2106 log_write(0, LOG_MAIN|LOG_PANIC,
2107 "<%s>: failed to expand transport's helo_data value for callout: %s",
2108 sx->addrlist->address, expand_string_message);
2109
2110 #ifdef SUPPORT_I18N
2111 if (sx->helo_data)
2112 {
2113 expand_string_message = NULL;
2114 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2115 &expand_string_message)),
2116 expand_string_message)
2117 if (sx->verify)
2118 log_write(0, LOG_MAIN|LOG_PANIC,
2119 "<%s>: failed to expand transport's helo_data value for callout: %s",
2120 sx->addrlist->address, expand_string_message);
2121 else
2122 sx->helo_data = NULL;
2123 }
2124 #endif
2125
2126 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2127 is nevertheless a reasonably clean way of programming this kind of logic,
2128 where you want to escape on any error. */
2129
2130 if (!sx->smtps)
2131 {
2132 #ifndef DISABLE_PIPE_CONNECT
2133 if (sx->early_pipe_active)
2134 {
2135 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2136 sx->outblock.cmd_count = 1;
2137 }
2138 else
2139 #endif
2140 {
2141 #ifdef TCP_QUICKACK
2142 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2143 sizeof(off));
2144 #endif
2145 if (!smtp_reap_banner(sx))
2146 goto RESPONSE_FAILED;
2147 }
2148
2149 #ifndef DISABLE_EVENT
2150 {
2151 uschar * s;
2152 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2153 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2154 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2155 if (s)
2156 {
2157 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2158 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2159 DEFER, FALSE, &sx->delivery_start);
2160 yield = DEFER;
2161 goto SEND_QUIT;
2162 }
2163 }
2164 #endif
2165
2166 /* Now check if the helo_data expansion went well, and sign off cleanly if
2167 it didn't. */
2168
2169 if (!sx->helo_data)
2170 {
2171 message = string_sprintf("failed to expand helo_data: %s",
2172 expand_string_message);
2173 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2174 yield = DEFER;
2175 goto SEND_QUIT;
2176 }
2177 }
2178
2179 /** Debugging without sending a message
2180 sx->addrlist->transport_return = DEFER;
2181 goto SEND_QUIT;
2182 **/
2183
2184 /* Errors that occur after this point follow an SMTP command, which is
2185 left in big_buffer by smtp_write_command() for use in error messages. */
2186
2187 smtp_command = big_buffer;
2188
2189 /* Tell the remote who we are...
2190
2191 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2192 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2193 greeting is of this form. The assumption was that the far end supports it
2194 properly... but experience shows that there are some that give 5xx responses,
2195 even though the banner includes "ESMTP" (there's a bloody-minded one that
2196 says "ESMTP not spoken here"). Cope with that case.
2197
2198 September 2000: Time has passed, and it seems reasonable now to always send
2199 EHLO at the start. It is also convenient to make the change while installing
2200 the TLS stuff.
2201
2202 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2203 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2204 would be no way to send out the mails, so there is now a host list
2205 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2206 PIPELINING problem as well. Maybe it can also be useful to cure other
2207 problems with broken servers.
2208
2209 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2210 Then somebody tried it with a Microsoft mailer... It seems that all other
2211 mailers use upper case for some reason (the RFC is quite clear about case
2212 independence) so, for peace of mind, I gave in. */
2213
2214 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2215
2216 /* Alas; be careful, since this goto is not an error-out, so conceivably
2217 we might set data between here and the target which we assume to exist
2218 and be usable. I can see this coming back to bite us. */
2219 #ifndef DISABLE_TLS
2220 if (sx->smtps)
2221 {
2222 smtp_peer_options |= OPTION_TLS;
2223 suppress_tls = FALSE;
2224 ob->tls_tempfail_tryclear = FALSE;
2225 smtp_command = US"SSL-on-connect";
2226 goto TLS_NEGOTIATE;
2227 }
2228 #endif
2229
2230 if (sx->esmtp)
2231 {
2232 if (smtp_write_command(sx,
2233 #ifndef DISABLE_PIPE_CONNECT
2234 sx->early_pipe_active ? SCMD_BUFFER :
2235 #endif
2236 SCMD_FLUSH,
2237 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2238 goto SEND_FAILED;
2239 sx->esmtp_sent = TRUE;
2240
2241 #ifndef DISABLE_PIPE_CONNECT
2242 if (sx->early_pipe_active)
2243 {
2244 sx->pending_EHLO = TRUE;
2245
2246 /* If we have too many authenticators to handle and might need to AUTH
2247 for this transport, pipeline no further as we will need the
2248 list of auth methods offered. Reap the banner and EHLO. */
2249
2250 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2251 && f.smtp_in_early_pipe_no_auth)
2252 {
2253 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2254 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2255 goto SEND_FAILED;
2256 if (sync_responses(sx, 2, 0) != 0)
2257 {
2258 HDEBUG(D_transport)
2259 debug_printf("failed reaping pipelined cmd responses\n");
2260 goto RESPONSE_FAILED;
2261 }
2262 sx->early_pipe_active = FALSE;
2263 }
2264 }
2265 else
2266 #endif
2267 if (!smtp_reap_ehlo(sx))
2268 goto RESPONSE_FAILED;
2269 }
2270 else
2271 DEBUG(D_transport)
2272 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2273
2274 #ifndef DISABLE_PIPE_CONNECT
2275 if (!sx->early_pipe_active)
2276 #endif
2277 if (!sx->esmtp)
2278 {
2279 BOOL good_response;
2280 int n = sizeof(sx->buffer);
2281 uschar * rsp = sx->buffer;
2282
2283 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2284 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2285
2286 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2287 goto SEND_FAILED;
2288 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2289 #ifdef EXPERIMENTAL_DSN_INFO
2290 sx->helo_response = string_copy(rsp);
2291 #endif
2292 if (!good_response)
2293 {
2294 /* Handle special logging for a closed connection after HELO
2295 when had previously sent EHLO */
2296
2297 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2298 {
2299 errno = ERRNO_SMTPCLOSED;
2300 goto EHLOHELO_FAILED;
2301 }
2302 memmove(sx->buffer, rsp, Ustrlen(rsp));
2303 goto RESPONSE_FAILED;
2304 }
2305 }
2306
2307 if (sx->esmtp || sx->lmtp)
2308 {
2309 #ifndef DISABLE_PIPE_CONNECT
2310 if (!sx->early_pipe_active)
2311 #endif
2312 {
2313 sx->peer_offered = ehlo_response(sx->buffer,
2314 OPTION_TLS /* others checked later */
2315 #ifndef DISABLE_PIPE_CONNECT
2316 | (sx->early_pipe_ok
2317 ? OPTION_IGNQ
2318 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2319 #ifdef SUPPORT_I18N
2320 | OPTION_UTF8
2321 #endif
2322 | OPTION_EARLY_PIPE
2323 : 0
2324 )
2325 #endif
2326 );
2327 #ifndef DISABLE_PIPE_CONNECT
2328 if (sx->early_pipe_ok)
2329 {
2330 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2331
2332 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2333 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 {
2335 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2336 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2337 write_ehlo_cache_entry(sx);
2338 }
2339 }
2340 #endif
2341 }
2342
2343 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2344
2345 #ifndef DISABLE_TLS
2346 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2347 #endif
2348 }
2349 }
2350
2351 /* For continuing deliveries down the same channel, having re-exec'd the socket
2352 is the standard input; for a socket held open from verify it is recorded
2353 in the cutthrough context block. Either way we don't need to redo EHLO here
2354 (but may need to do so for TLS - see below).
2355 Set up the pointer to where subsequent commands will be left, for
2356 error messages. Note that smtp_peer_options will have been
2357 set from the command line if they were set in the process that passed the
2358 connection on. */
2359
2360 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2361 as the continue goes via transport_pass_socket() and doublefork and exec.
2362 It does not wait. Unclear how we keep separate host's responses
2363 separate - we could match up by host ip+port as a bodge. */
2364
2365 else
2366 {
2367 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2368 {
2369 sx->cctx = cutthrough.cctx;
2370 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2371 }
2372 else
2373 {
2374 sx->cctx.sock = 0; /* stdin */
2375 sx->cctx.tls_ctx = NULL;
2376 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2377 }
2378 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2379 smtp_command = big_buffer;
2380 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2381
2382 /* For a continued connection with TLS being proxied for us, or a
2383 held-open verify connection with TLS, nothing more to do. */
2384
2385 if ( continue_proxy_cipher
2386 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2387 && cutthrough.is_tls)
2388 )
2389 {
2390 sx->peer_offered = smtp_peer_options;
2391 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2392 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2393 continue_proxy_cipher ? "proxied" : "verify conn with");
2394 return OK;
2395 }
2396 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2397 }
2398
2399 /* If TLS is available on this connection, whether continued or not, attempt to
2400 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2401 send another EHLO - the server may give a different answer in secure mode. We
2402 use a separate buffer for reading the response to STARTTLS so that if it is
2403 negative, the original EHLO data is available for subsequent analysis, should
2404 the client not be required to use TLS. If the response is bad, copy the buffer
2405 for error analysis. */
2406
2407 #ifndef DISABLE_TLS
2408 if ( smtp_peer_options & OPTION_TLS
2409 && !suppress_tls
2410 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2411 && ( !sx->verify
2412 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2413 ) )
2414 {
2415 uschar buffer2[4096];
2416
2417 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2418 goto SEND_FAILED;
2419
2420 #ifndef DISABLE_PIPE_CONNECT
2421 /* If doing early-pipelining reap the banner and EHLO-response but leave
2422 the response for the STARTTLS we just sent alone. */
2423
2424 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2425 {
2426 HDEBUG(D_transport)
2427 debug_printf("failed reaping pipelined cmd responses\n");
2428 goto RESPONSE_FAILED;
2429 }
2430 #endif
2431
2432 /* If there is an I/O error, transmission of this message is deferred. If
2433 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2434 false, we also defer. However, if there is a temporary rejection of STARTTLS
2435 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2436 STARTTLS, we carry on. This means we will try to send the message in clear,
2437 unless the host is in hosts_require_tls (tested below). */
2438
2439 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2440 {
2441 if ( errno != 0
2442 || buffer2[0] == 0
2443 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2444 )
2445 {
2446 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2447 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2448 goto RESPONSE_FAILED;
2449 }
2450 }
2451
2452 /* STARTTLS accepted: try to negotiate a TLS session. */
2453
2454 else
2455 TLS_NEGOTIATE:
2456 {
2457 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2458 {
2459 /* TLS negotiation failed; give an error. From outside, this function may
2460 be called again to try in clear on a new connection, if the options permit
2461 it for this host. */
2462 #ifdef USE_GNUTLS
2463 GNUTLS_CONN_FAILED:
2464 #endif
2465 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2466
2467 # ifdef SUPPORT_DANE
2468 if (sx->conn_args.dane)
2469 {
2470 log_write(0, LOG_MAIN,
2471 "DANE attempt failed; TLS connection to %s [%s]: %s",
2472 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2473 # ifndef DISABLE_EVENT
2474 (void) event_raise(sx->conn_args.tblock->event_action,
2475 US"dane:fail", US"validation-failure"); /* could do with better detail */
2476 # endif
2477 }
2478 # endif
2479
2480 errno = ERRNO_TLSFAILURE;
2481 message = string_sprintf("TLS session: %s", tls_errstr);
2482 sx->send_quit = FALSE;
2483 goto TLS_FAILED;
2484 }
2485
2486 /* TLS session is set up */
2487
2488 smtp_peer_options_wrap = smtp_peer_options;
2489 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2490 if (addr->transport_return == PENDING_DEFER)
2491 {
2492 addr->cipher = tls_out.cipher;
2493 addr->ourcert = tls_out.ourcert;
2494 addr->peercert = tls_out.peercert;
2495 addr->peerdn = tls_out.peerdn;
2496 addr->ocsp = tls_out.ocsp;
2497 addr->tlsver = tls_out.ver;
2498 }
2499 }
2500 }
2501
2502 /* if smtps, we'll have smtp_command set to something else; always safe to
2503 reset it here. */
2504 smtp_command = big_buffer;
2505
2506 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2507 helo_data is null, we are dealing with a connection that was passed from
2508 another process, and so we won't have expanded helo_data above. We have to
2509 expand it here. $sending_ip_address and $sending_port are set up right at the
2510 start of the Exim process (in exim.c). */
2511
2512 if (tls_out.active.sock >= 0)
2513 {
2514 uschar * greeting_cmd;
2515
2516 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2517 {
2518 uschar *message = string_sprintf("failed to expand helo_data: %s",
2519 expand_string_message);
2520 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2521 yield = DEFER;
2522 goto SEND_QUIT;
2523 }
2524
2525 #ifndef DISABLE_PIPE_CONNECT
2526 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2527 We're unlikely to get the group sent and delivered before the server sends its
2528 banner, but it's still worth sending as a group.
2529 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2530 the reverse. */
2531
2532 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2533 {
2534 sx->peer_offered = sx->ehlo_resp.crypted_features;
2535 if ((sx->early_pipe_active =
2536 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2537 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2538 }
2539 #endif
2540
2541 /* For SMTPS we need to wait for the initial OK response. */
2542 if (sx->smtps)
2543 #ifndef DISABLE_PIPE_CONNECT
2544 if (sx->early_pipe_active)
2545 {
2546 sx->pending_BANNER = TRUE;
2547 sx->outblock.cmd_count = 1;
2548 }
2549 else
2550 #endif
2551 if (!smtp_reap_banner(sx))
2552 goto RESPONSE_FAILED;
2553
2554 if (sx->lmtp)
2555 greeting_cmd = US"LHLO";
2556 else if (sx->esmtp)
2557 greeting_cmd = US"EHLO";
2558 else
2559 {
2560 greeting_cmd = US"HELO";
2561 DEBUG(D_transport)
2562 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2563 }
2564
2565 if (smtp_write_command(sx,
2566 #ifndef DISABLE_PIPE_CONNECT
2567 sx->early_pipe_active ? SCMD_BUFFER :
2568 #endif
2569 SCMD_FLUSH,
2570 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2571 goto SEND_FAILED;
2572
2573 #ifndef DISABLE_PIPE_CONNECT
2574 if (sx->early_pipe_active)
2575 sx->pending_EHLO = TRUE;
2576 else
2577 #endif
2578 {
2579 if (!smtp_reap_ehlo(sx))
2580 #ifdef USE_GNUTLS
2581 {
2582 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2583 cert late, under TLS1.3 - which means here; the first time we try to
2584 receive crypted data. Treat it as if it was a connect-time failure.
2585 See also the early-pipe equivalent... which will be hard; every call
2586 to sync_responses will need to check the result.
2587 It would be nicer to have GnuTLS check the cert during the handshake.
2588 Can it do that, with all the flexibility we need? */
2589
2590 tls_errstr = US"error on first read";
2591 goto GNUTLS_CONN_FAILED;
2592 }
2593 #else
2594 goto RESPONSE_FAILED;
2595 #endif
2596 smtp_peer_options = 0;
2597 }
2598 }
2599
2600 /* If the host is required to use a secure channel, ensure that we
2601 have one. */
2602
2603 else if ( sx->smtps
2604 # ifdef SUPPORT_DANE
2605 || sx->conn_args.dane
2606 # endif
2607 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2608 )
2609 {
2610 errno = ERRNO_TLSREQUIRED;
2611 message = string_sprintf("a TLS session is required, but %s",
2612 smtp_peer_options & OPTION_TLS
2613 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2614 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2615 if (sx->conn_args.dane)
2616 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2617 smtp_peer_options & OPTION_TLS
2618 ? US"validation-failure" /* could do with better detail */
2619 : US"starttls-not-supported");
2620 # endif
2621 goto TLS_FAILED;
2622 }
2623 #endif /*DISABLE_TLS*/
2624
2625 /* If TLS is active, we have just started it up and re-done the EHLO command,
2626 so its response needs to be analyzed. If TLS is not active and this is a
2627 continued session down a previously-used socket, we haven't just done EHLO, so
2628 we skip this. */
2629
2630 if (continue_hostname == NULL
2631 #ifndef DISABLE_TLS
2632 || tls_out.active.sock >= 0
2633 #endif
2634 )
2635 {
2636 if (sx->esmtp || sx->lmtp)
2637 {
2638 #ifndef DISABLE_PIPE_CONNECT
2639 if (!sx->early_pipe_active)
2640 #endif
2641 {
2642 sx->peer_offered = ehlo_response(sx->buffer,
2643 0 /* no TLS */
2644 #ifndef DISABLE_PIPE_CONNECT
2645 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2646 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2647 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2648 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2649
2650 #else
2651
2652 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2653 | OPTION_CHUNKING
2654 | OPTION_PRDR
2655 # ifdef SUPPORT_I18N
2656 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2657 /*XXX if we hand peercaps on to continued-conn processes,
2658 must not depend on this addr */
2659 # endif
2660 | OPTION_DSN
2661 | OPTION_PIPE
2662 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2663 #endif
2664 );
2665 #ifndef DISABLE_PIPE_CONNECT
2666 if (tls_out.active.sock >= 0)
2667 sx->ehlo_resp.crypted_features = sx->peer_offered;
2668 #endif
2669 }
2670
2671 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2672 lmtp_ignore_quota option was set. */
2673
2674 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2675
2676 /* If the response to EHLO specified support for the SIZE parameter, note
2677 this, provided size_addition is non-negative. */
2678
2679 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2680
2681 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2682 the current host, esmtp will be false, so PIPELINING can never be used. If
2683 the current host matches hosts_avoid_pipelining, don't do it. */
2684
2685 if ( sx->peer_offered & OPTION_PIPE
2686 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2687 smtp_peer_options |= OPTION_PIPE;
2688
2689 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2690 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2691
2692 if ( sx->peer_offered & OPTION_CHUNKING
2693 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2694 sx->peer_offered &= ~OPTION_CHUNKING;
2695
2696 if (sx->peer_offered & OPTION_CHUNKING)
2697 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2698
2699 #ifndef DISABLE_PRDR
2700 if ( sx->peer_offered & OPTION_PRDR
2701 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2702 sx->peer_offered &= ~OPTION_PRDR;
2703
2704 if (sx->peer_offered & OPTION_PRDR)
2705 DEBUG(D_transport) debug_printf("PRDR usable\n");
2706 #endif
2707
2708 /* Note if the server supports DSN */
2709 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2710 DEBUG(D_transport) debug_printf("%susing DSN\n",
2711 sx->peer_offered & OPTION_DSN ? "" : "not ");
2712
2713 #ifndef DISABLE_PIPE_CONNECT
2714 if ( sx->early_pipe_ok
2715 && !sx->early_pipe_active
2716 && tls_out.active.sock >= 0
2717 && smtp_peer_options & OPTION_PIPE
2718 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2719 & OPTION_EARLY_PIPE)
2720 {
2721 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2722 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2723 write_ehlo_cache_entry(sx);
2724 }
2725 #endif
2726
2727 /* Note if the response to EHLO specifies support for the AUTH extension.
2728 If it has, check that this host is one we want to authenticate to, and do
2729 the business. The host name and address must be available when the
2730 authenticator's client driver is running. */
2731
2732 switch (yield = smtp_auth(sx))
2733 {
2734 default: goto SEND_QUIT;
2735 case OK: break;
2736 case FAIL_SEND: goto SEND_FAILED;
2737 case FAIL: goto RESPONSE_FAILED;
2738 }
2739 }
2740 }
2741 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2742
2743 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2744 message-specific. */
2745
2746 sx->setting_up = FALSE;
2747
2748 #ifdef SUPPORT_I18N
2749 if (sx->addrlist->prop.utf8_msg)
2750 {
2751 uschar * s;
2752
2753 /* If the transport sets a downconversion mode it overrides any set by ACL
2754 for the message. */
2755
2756 if ((s = ob->utf8_downconvert))
2757 {
2758 if (!(s = expand_string(s)))
2759 {
2760 message = string_sprintf("failed to expand utf8_downconvert: %s",
2761 expand_string_message);
2762 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2763 yield = DEFER;
2764 goto SEND_QUIT;
2765 }
2766 switch (*s)
2767 {
2768 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2769 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2770 break;
2771 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2772 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2773 break;
2774 case '-': if (s[1] == '1')
2775 {
2776 sx->addrlist->prop.utf8_downcvt = FALSE;
2777 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2778 }
2779 break;
2780 }
2781 }
2782
2783 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2784 && !sx->addrlist->prop.utf8_downcvt_maybe;
2785 DEBUG(D_transport) if (!sx->utf8_needed)
2786 debug_printf("utf8: %s downconvert\n",
2787 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2788 }
2789
2790 /* If this is an international message we need the host to speak SMTPUTF8 */
2791 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2792 {
2793 errno = ERRNO_UTF8_FWD;
2794 goto RESPONSE_FAILED;
2795 }
2796 #endif /*SUPPORT_I18N*/
2797
2798 return OK;
2799
2800
2801 {
2802 int code;
2803
2804 RESPONSE_FAILED:
2805 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2806 {
2807 /* There is a testing facility for simulating a connection timeout, as I
2808 can't think of any other way of doing this. It converts a connection
2809 refused into a timeout if the timeout is set to 999999. This is done for
2810 a 3whs connection in ip_connect(), but a TFO connection does not error
2811 there - instead it gets ECONNREFUSED on the first data read. Tracking
2812 that a TFO really was done is too hard, or we would set a
2813 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2814 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2815 cmd-timeout. */
2816
2817 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2818 errno = ETIMEDOUT;
2819 set_errno_nohost(sx->addrlist,
2820 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2821 sx->verify ? US strerror(errno) : NULL,
2822 DEFER, FALSE, &sx->delivery_start);
2823 sx->send_quit = FALSE;
2824 return DEFER;
2825 }
2826
2827 /* really an error on an SMTP read */
2828 message = NULL;
2829 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2830 sx->buffer, &code, &message, &pass_message);
2831 yield = DEFER;
2832 goto FAILED;
2833
2834 SEND_FAILED:
2835 code = '4';
2836 message = US string_sprintf("send() to %s [%s] failed: %s",
2837 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2838 sx->send_quit = FALSE;
2839 yield = DEFER;
2840 goto FAILED;
2841
2842 EHLOHELO_FAILED:
2843 code = '4';
2844 message = string_sprintf("Remote host closed connection in response to %s"
2845 " (EHLO response was: %s)", smtp_command, sx->buffer);
2846 sx->send_quit = FALSE;
2847 yield = DEFER;
2848 goto FAILED;
2849
2850 /* This label is jumped to directly when a TLS negotiation has failed,
2851 or was not done for a host for which it is required. Values will be set
2852 in message and errno, and setting_up will always be true. Treat as
2853 a temporary error. */
2854
2855 #ifndef DISABLE_TLS
2856 TLS_FAILED:
2857 code = '4', yield = DEFER;
2858 goto FAILED;
2859 #endif
2860
2861 /* The failure happened while setting up the call; see if the failure was
2862 a 5xx response (this will either be on connection, or following HELO - a 5xx
2863 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2864 fail all addresses, as this host is never going to accept them. For other
2865 errors during setting up (timeouts or whatever), defer all addresses, and
2866 yield DEFER, so that the host is not tried again for a while.
2867
2868 XXX This peeking for another host feels like a layering violation. We want
2869 to note the host as unusable, but down here we shouldn't know if this was
2870 the last host to try for the addr(list). Perhaps the upper layer should be
2871 the one to do set_errno() ? The problem is that currently the addr is where
2872 errno etc. are stashed, but until we run out of hosts to try the errors are
2873 host-specific. Maybe we should enhance the host_item definition? */
2874
2875 FAILED:
2876 sx->ok = FALSE; /* For when reached by GOTO */
2877 set_errno(sx->addrlist, errno, message,
2878 sx->conn_args.host->next
2879 ? DEFER
2880 : code == '5'
2881 #ifdef SUPPORT_I18N
2882 || errno == ERRNO_UTF8_FWD
2883 #endif
2884 ? FAIL : DEFER,
2885 pass_message,
2886 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2887 #ifdef EXPERIMENTAL_DSN_INFO
2888 sx->smtp_greeting, sx->helo_response,
2889 #endif
2890 &sx->delivery_start);
2891 }
2892
2893
2894 SEND_QUIT:
2895
2896 if (sx->send_quit)
2897 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2898
2899 #ifndef DISABLE_TLS
2900 if (sx->cctx.tls_ctx)
2901 {
2902 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2903 sx->cctx.tls_ctx = NULL;
2904 }
2905 #endif
2906
2907 /* Close the socket, and return the appropriate value, first setting
2908 works because the NULL setting is passed back to the calling process, and
2909 remote_max_parallel is forced to 1 when delivering over an existing connection,
2910 */
2911
2912 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2913 if (sx->send_quit)
2914 {
2915 shutdown(sx->cctx.sock, SHUT_WR);
2916 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2917 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2918 i--; /* drain socket */
2919 sx->send_quit = FALSE;
2920 }
2921 (void)close(sx->cctx.sock);
2922 sx->cctx.sock = -1;
2923
2924 #ifndef DISABLE_EVENT
2925 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2926 #endif
2927
2928 continue_transport = NULL;
2929 continue_hostname = NULL;
2930 return yield;
2931 }
2932
2933
2934
2935
2936 /* Create the string of options that will be appended to the MAIL FROM:
2937 in the connection context buffer */
2938
2939 static int
2940 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2941 {
2942 uschar * p = sx->buffer;
2943 address_item * addr;
2944 int address_count;
2945
2946 *p = 0;
2947
2948 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2949 send it, adding something to the message size to allow for imprecision
2950 and things that get added en route. Exim keeps the number of lines
2951 in a message, so we can give an accurate value for the original message, but we
2952 need some additional to handle added headers. (Double "." characters don't get
2953 included in the count.) */
2954
2955 if ( message_size > 0
2956 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2957 {
2958 /*XXX problem here under spool_files_wireformat?
2959 Or just forget about lines? Or inflate by a fixed proportion? */
2960
2961 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2962 while (*p) p++;
2963 }
2964
2965 #ifndef DISABLE_PRDR
2966 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2967 request that */
2968
2969 sx->prdr_active = FALSE;
2970 if (sx->peer_offered & OPTION_PRDR)
2971 for (address_item * addr = addrlist; addr; addr = addr->next)
2972 if (addr->transport_return == PENDING_DEFER)
2973 {
2974 for (addr = addr->next; addr; addr = addr->next)
2975 if (addr->transport_return == PENDING_DEFER)
2976 { /* at least two recipients to send */
2977 sx->prdr_active = TRUE;
2978 sprintf(CS p, " PRDR"); p += 5;
2979 break;
2980 }
2981 break;
2982 }
2983 #endif
2984
2985 #ifdef SUPPORT_I18N
2986 /* If it supports internationalised messages, and this meesage need that,
2987 request it */
2988
2989 if ( sx->peer_offered & OPTION_UTF8
2990 && addrlist->prop.utf8_msg
2991 && !addrlist->prop.utf8_downcvt
2992 )
2993 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2994 #endif
2995
2996 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2997 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2998 addr && address_count < sx->max_rcpt;
2999 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3000 {
3001 address_count++;
3002 if (!(addr->dsn_flags & rf_dsnlasthop))
3003 {
3004 sx->dsn_all_lasthop = FALSE;
3005 break;
3006 }
3007 }
3008
3009 /* Add any DSN flags to the mail command */
3010
3011 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3012 {
3013 if (dsn_ret == dsn_ret_hdrs)
3014 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3015 else if (dsn_ret == dsn_ret_full)
3016 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3017
3018 if (dsn_envid)
3019 {
3020 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3021 while (*p) p++;
3022 }
3023 }
3024
3025 /* If an authenticated_sender override has been specified for this transport
3026 instance, expand it. If the expansion is forced to fail, and there was already
3027 an authenticated_sender for this message, the original value will be used.
3028 Other expansion failures are serious. An empty result is ignored, but there is
3029 otherwise no check - this feature is expected to be used with LMTP and other
3030 cases where non-standard addresses (e.g. without domains) might be required. */
3031
3032 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3033 }
3034
3035
3036 static void
3037 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3038 {
3039 uschar * p = sx->buffer;
3040 *p = 0;
3041
3042 /* Add any DSN flags to the rcpt command */
3043
3044 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3045 {
3046 if (addr->dsn_flags & rf_dsnflags)
3047 {
3048 BOOL first = TRUE;
3049
3050 Ustrcpy(p, US" NOTIFY=");
3051 while (*p) p++;
3052 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3053 {
3054 if (!first) *p++ = ',';
3055 first = FALSE;
3056 Ustrcpy(p, rf_names[i]);
3057 while (*p) p++;
3058 }
3059 }
3060
3061 if (addr->dsn_orcpt)
3062 {
3063 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3064 addr->dsn_orcpt);
3065 while (*p) p++;
3066 }
3067 }
3068 }
3069
3070
3071
3072 /*
3073 Return:
3074 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3075 -1 MAIL response error
3076 -2 any non-MAIL read i/o error
3077 -3 non-MAIL response timeout
3078 -4 internal error; channel still usable
3079 -5 transmit failed
3080 */
3081
3082 int
3083 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3084 {
3085 address_item * addr;
3086 int address_count, pipe_limit;
3087 int rc;
3088
3089 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3090 {
3091 *yield = ERROR;
3092 return -4;
3093 }
3094
3095 /* From here until we send the DATA command, we can make use of PIPELINING
3096 if the server host supports it. The code has to be able to check the responses
3097 at any point, for when the buffer fills up, so we write it totally generally.
3098 When PIPELINING is off, each command written reports that it has flushed the
3099 buffer. */
3100
3101 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3102
3103 {
3104 uschar * s = sx->from_addr;
3105 #ifdef SUPPORT_I18N
3106 uschar * errstr = NULL;
3107
3108 /* If we must downconvert, do the from-address here. Remember we had to
3109 for the to-addresses (done below), and also (ugly) for re-doing when building
3110 the delivery log line. */
3111
3112 if ( sx->addrlist->prop.utf8_msg
3113 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3114 )
3115 {
3116 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3117 {
3118 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3119 *yield = ERROR;
3120 return -4;
3121 }
3122 setflag(sx->addrlist, af_utf8_downcvt);
3123 }
3124 #endif
3125
3126 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3127 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3128 }
3129
3130 mail_command = string_copy(big_buffer); /* Save for later error message */
3131
3132 switch(rc)
3133 {
3134 case -1: /* Transmission error */
3135 return -5;
3136
3137 case +1: /* Cmd was sent */
3138 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3139 (SOB sx->conn_args.ob)->command_timeout))
3140 {
3141 if (errno == 0 && sx->buffer[0] == '4')
3142 {
3143 errno = ERRNO_MAIL4XX;
3144 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3145 }
3146 return -1;
3147 }
3148 sx->pending_MAIL = FALSE;
3149 break;
3150
3151 /* otherwise zero: command queued for pipeline */
3152 }
3153
3154 /* Pass over all the relevant recipient addresses for this host, which are the
3155 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3156 several before we have to read the responses for those seen so far. This
3157 checking is done by a subroutine because it also needs to be done at the end.
3158 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3159 the next one if not all are sent.
3160
3161 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3162 last address because we want to abort if any recipients have any kind of
3163 problem, temporary or permanent. We know that all recipient addresses will have
3164 the PENDING_DEFER status, because only one attempt is ever made, and we know
3165 that max_rcpt will be large, so all addresses will be done at once.
3166
3167 For verify we flush the pipeline after any (the only) rcpt address. */
3168
3169 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3170 addr && address_count < sx->max_rcpt;
3171 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3172 {
3173 int cmds_sent;
3174 BOOL no_flush;
3175 uschar * rcpt_addr;
3176
3177 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3178 ? dsn_support_yes : dsn_support_no;
3179
3180 address_count++;
3181 if (pipe_limit-- <= 0)
3182 { no_flush = FALSE; pipe_limit = 100; }
3183 else
3184 no_flush = pipelining_active && !sx->verify
3185 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3186
3187 build_rcptcmd_options(sx, addr);
3188
3189 /* Now send the RCPT command, and process outstanding responses when
3190 necessary. After a timeout on RCPT, we just end the function, leaving the
3191 yield as OK, because this error can often mean that there is a problem with
3192 just one address, so we don't want to delay the host. */
3193
3194 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3195
3196 #ifdef SUPPORT_I18N
3197 if ( testflag(sx->addrlist, af_utf8_downcvt)
3198 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3199 )
3200 {
3201 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3202 errno = ERRNO_EXPANDFAIL;
3203 return -5; /*XXX too harsh? */
3204 }
3205 #endif
3206
3207 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3208 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3209
3210 if (cmds_sent < 0) return -5;
3211 if (cmds_sent > 0)
3212 {
3213 switch(sync_responses(sx, cmds_sent, 0))
3214 {
3215 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3216 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3217 break;
3218
3219 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3220 if (!sx->lmtp) /* can't tell about progress yet */
3221 sx->completed_addr = TRUE;
3222 case 0: /* No 2xx or 5xx, but no probs */
3223 /* If any RCPT got a 452 response then next_addr has been updated
3224 for restarting with a new MAIL on the same connection. Send no more
3225 RCPTs for this MAIL. */
3226
3227 if (sx->RCPT_452)
3228 {
3229 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3230 sx->RCPT_452 = FALSE;
3231 /* sx->next_addr has been reset for fast_retry */
3232 return 0;
3233 }
3234 break;
3235
3236 case -1: return -3; /* Timeout on RCPT */
3237 case -2: return -2; /* non-MAIL read i/o error */
3238 default: return -1; /* any MAIL error */
3239
3240 #ifndef DISABLE_PIPE_CONNECT
3241 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3242 case -5: return -1; /* TLS first-read error */
3243 #endif
3244 }
3245 }
3246 } /* Loop for next address */
3247
3248 sx->next_addr = addr;
3249 return 0;
3250 }
3251
3252
3253 #ifndef DISABLE_TLS
3254 /*****************************************************
3255 * Proxy TLS connection for another transport process *
3256 ******************************************************/
3257 /*
3258 Close the unused end of the pipe, fork once more, then use the given buffer
3259 as a staging area, and select on both the given fd and the TLS'd client-fd for
3260 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3261 Do blocking full-size writes, and reads under a timeout. Once both input
3262 channels are closed, exit the process.
3263
3264 Arguments:
3265 ct_ctx tls context
3266 buf space to use for buffering
3267 bufsiz size of buffer
3268 pfd pipe filedescriptor array; [0] is comms to proxied process
3269 timeout per-read timeout, seconds
3270
3271 Does not return.
3272 */
3273
3274 void
3275 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3276 int timeout)
3277 {
3278 fd_set rfds, efds;
3279 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3280 int rc, i;
3281
3282 close(pfd[1]);
3283 if ((rc = fork()))
3284 {
3285 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3286 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3287 }
3288
3289 testharness_pause_ms(100); /* let parent debug out */
3290 set_process_info("proxying TLS connection for continued transport");
3291 FD_ZERO(&rfds);
3292 FD_SET(tls_out.active.sock, &rfds);
3293 FD_SET(pfd[0], &rfds);
3294
3295 for (int fd_bits = 3; fd_bits; )
3296 {
3297 time_t time_left = timeout;
3298 time_t time_start = time(NULL);
3299
3300 /* wait for data */
3301 efds = rfds;
3302 do
3303 {
3304 struct timeval tv = { time_left, 0 };
3305
3306 rc = select(max_fd,
3307 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3308
3309 if (rc < 0 && errno == EINTR)
3310 if ((time_left -= time(NULL) - time_start) > 0) continue;
3311
3312 if (rc <= 0)
3313 {
3314 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3315 goto done;
3316 }
3317
3318 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3319 {
3320 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3321 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3322 goto done;
3323 }
3324 }
3325 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3326
3327 /* handle inbound data */
3328 if (FD_ISSET(tls_out.active.sock, &rfds))
3329 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3330 {
3331 fd_bits &= ~1;
3332 FD_CLR(tls_out.active.sock, &rfds);
3333 shutdown(pfd[0], SHUT_WR);
3334 timeout = 5;
3335 }
3336 else
3337 {
3338 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3339 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3340 }
3341 else if (fd_bits & 1)
3342 FD_SET(tls_out.active.sock, &rfds);
3343
3344 /* handle outbound data */
3345 if (FD_ISSET(pfd[0], &rfds))
3346 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3347 {
3348 fd_bits = 0;
3349 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3350 ct_ctx = NULL;
3351 }
3352 else
3353 {
3354 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3355 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3356 goto done;
3357 }
3358 else if (fd_bits & 2)
3359 FD_SET(pfd[0], &rfds);
3360 }
3361
3362 done:
3363 testharness_pause_ms(100); /* let logging complete */
3364 exim_exit(0, US"TLS proxy");
3365 }
3366 #endif
3367
3368
3369 /*************************************************
3370 * Deliver address list to given host *
3371 *************************************************/
3372
3373 /* If continue_hostname is not null, we get here only when continuing to
3374 deliver down an existing channel. The channel was passed as the standard
3375 input. TLS is never active on a passed channel; the previous process always
3376 closes it down before passing the connection on.
3377
3378 Otherwise, we have to make a connection to the remote host, and do the
3379 initial protocol exchange.
3380
3381 When running as an MUA wrapper, if the sender or any recipient is rejected,
3382 temporarily or permanently, we force failure for all recipients.
3383
3384 Arguments:
3385 addrlist chain of potential addresses to deliver; only those whose
3386 transport_return field is set to PENDING_DEFER are currently
3387 being processed; others should be skipped - they have either
3388 been delivered to an earlier host or IP address, or been
3389 failed by one of them.
3390 host host to deliver to
3391 host_af AF_INET or AF_INET6
3392 defport default TCP/IP port to use if host does not specify, in host
3393 byte order
3394 interface interface to bind to, or NULL
3395 tblock transport instance block
3396 message_defer set TRUE if yield is OK, but all addresses were deferred
3397 because of a non-recipient, non-host failure, that is, a
3398 4xx response to MAIL FROM, DATA, or ".". This is a defer
3399 that is specific to the message.
3400 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3401 a second attempt after TLS initialization fails
3402
3403 Returns: OK - the connection was made and the delivery attempted;
3404 the result for each address is in its data block.
3405 DEFER - the connection could not be made, or something failed
3406 while setting up the SMTP session, or there was a
3407 non-message-specific error, such as a timeout.
3408 ERROR - a filter command is specified for this transport,
3409 and there was a problem setting it up; OR helo_data
3410 or add_headers or authenticated_sender is specified
3411 for this transport, and the string failed to expand
3412
3413 For all non-OK returns the first addr of the list carries the
3414 time taken for the attempt.
3415 */
3416
3417 static int
3418 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3419 uschar *interface, transport_instance *tblock,
3420 BOOL *message_defer, BOOL suppress_tls)
3421 {
3422 smtp_transport_options_block * ob = SOB tblock->options_block;
3423 int yield = OK;
3424 int save_errno;
3425 int rc;
3426
3427 BOOL pass_message = FALSE;
3428 uschar *message = NULL;
3429 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3430 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3431
3432 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3433 *message_defer = FALSE;
3434
3435 memset(sx, 0, sizeof(*sx));
3436 sx->addrlist = addrlist;
3437 sx->conn_args.host = host;
3438 sx->conn_args.host_af = host_af,
3439 sx->port = defport;
3440 sx->conn_args.interface = interface;
3441 sx->helo_data = NULL;
3442 sx->conn_args.tblock = tblock;
3443 /* sx->verify = FALSE; */
3444 gettimeofday(&sx->delivery_start, NULL);
3445 sx->sync_addr = sx->first_addr = addrlist;
3446
3447 /* Get the channel set up ready for a message (MAIL FROM being the next
3448 SMTP command to send */
3449
3450 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3451 {
3452 timesince(&addrlist->delivery_time, &sx->delivery_start);
3453 return rc;
3454 }
3455
3456 /* If there is a filter command specified for this transport, we can now
3457 set it up. This cannot be done until the identify of the host is known. */
3458
3459 if (tblock->filter_command)
3460 {
3461 transport_filter_timeout = tblock->filter_timeout;
3462
3463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3464 yield ERROR. */
3465
3466 if (!transport_set_up_command(&transport_filter_argv,
3467 tblock->filter_command, TRUE, DEFER, addrlist,
3468 string_sprintf("%.50s transport", tblock->name), NULL))
3469 {
3470 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3471 FALSE, &sx->delivery_start);
3472 yield = ERROR;
3473 goto SEND_QUIT;
3474 }
3475
3476 if ( transport_filter_argv
3477 && *transport_filter_argv
3478 && **transport_filter_argv
3479 && sx->peer_offered & OPTION_CHUNKING
3480 #ifndef DISABLE_DKIM
3481 /* When dkim signing, chunking is handled even with a transport-filter */
3482 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3483 && !ob->dkim.force_bodyhash
3484 #endif
3485 )
3486 {
3487 sx->peer_offered &= ~OPTION_CHUNKING;
3488 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3489 }
3490 }
3491
3492 /* For messages that have more than the maximum number of envelope recipients,
3493 we want to send several transactions down the same SMTP connection. (See
3494 comments in deliver.c as to how this reconciles, heuristically, with
3495 remote_max_parallel.) This optimization was added to Exim after the following
3496 code was already working. The simplest way to put it in without disturbing the
3497 code was to use a goto to jump back to this point when there is another
3498 transaction to handle. */
3499
3500 SEND_MESSAGE:
3501 sx->from_addr = return_path;
3502 sx->sync_addr = sx->first_addr;
3503 sx->ok = FALSE;
3504 sx->send_rset = TRUE;
3505 sx->completed_addr = FALSE;
3506
3507
3508 /* If we are a continued-connection-after-verify the MAIL and RCPT
3509 commands were already sent; do not re-send but do mark the addrs as
3510 having been accepted up to RCPT stage. A traditional cont-conn
3511 always has a sequence number greater than one. */
3512
3513 if (continue_hostname && continue_sequence == 1)
3514 {
3515 sx->peer_offered = smtp_peer_options;
3516 /* sx->pending_MAIL = FALSE; */
3517 sx->ok = TRUE;
3518 /* sx->next_addr = NULL; */
3519
3520 for (address_item * addr = addrlist; addr; addr = addr->next)
3521 addr->transport_return = PENDING_OK;
3522 }
3523 else
3524 {
3525 /* Initiate a message transfer. */
3526
3527 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3528 {
3529 case 0: break;
3530 case -1: case -2: goto RESPONSE_FAILED;
3531 case -3: goto END_OFF;
3532 case -4: goto SEND_QUIT;
3533 default: goto SEND_FAILED;
3534 }
3535
3536 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3537 permanently or temporarily. We should have flushed and synced after the last
3538 RCPT. */
3539
3540 if (mua_wrapper)
3541 {
3542 address_item * a;
3543 unsigned cnt;
3544
3545 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3546 if (a->transport_return != PENDING_OK)
3547 {
3548 /*XXX could we find a better errno than 0 here? */
3549 set_errno_nohost(addrlist, 0, a->message, FAIL,
3550 testflag(a, af_pass_message), &sx->delivery_start);
3551 sx->ok = FALSE;
3552 break;
3553 }
3554 }
3555 }
3556
3557 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3558 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3559 have a good recipient buffered up if we are pipelining. We don't want to waste
3560 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3561 are pipelining. The responses are all handled by sync_responses().
3562 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3563 to send is. */
3564
3565 if ( !(sx->peer_offered & OPTION_CHUNKING)
3566 && (sx->ok || (pipelining_active && !mua_wrapper)))
3567 {
3568 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3569
3570 if (count < 0) goto SEND_FAILED;
3571 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3572 {
3573 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3574 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3575 break;
3576
3577 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3578 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3579 case 0: break; /* No 2xx or 5xx, but no probs */
3580
3581 case -1: goto END_OFF; /* Timeout on RCPT */
3582
3583 #ifndef DISABLE_PIPE_CONNECT
3584 case -5: /* TLS first-read error */
3585 case -4: HDEBUG(D_transport)
3586 debug_printf("failed reaping pipelined cmd responses\n");
3587 #endif
3588 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3589 }
3590 pipelining_active = FALSE;
3591 data_command = string_copy(big_buffer); /* Save for later error message */
3592 }
3593
3594 /* If there were no good recipients (but otherwise there have been no
3595 problems), just set ok TRUE, since we have handled address-specific errors
3596 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3597 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3598 well as body. Set the appropriate timeout value to be used for each chunk.
3599 (Haven't been able to make it work using select() for writing yet.) */
3600
3601 if ( !sx->ok
3602 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3603 {
3604 /* Save the first address of the next batch. */
3605 sx->first_addr = sx->next_addr;
3606
3607 sx->ok = TRUE;
3608 }
3609 else
3610 {
3611 transport_ctx tctx = {
3612 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3613 .tblock = tblock,
3614 .addr = addrlist,
3615 .check_string = US".",
3616 .escape_string = US"..", /* Escaping strings */
3617 .options =
3618 topt_use_crlf | topt_escape_headers
3619 | (tblock->body_only ? topt_no_headers : 0)
3620 | (tblock->headers_only ? topt_no_body : 0)
3621 | (tblock->return_path_add ? topt_add_return_path : 0)
3622 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3623 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3624 };
3625
3626 /* If using CHUNKING we need a callback from the generic transport
3627 support to us, for the sending of BDAT smtp commands and the reaping
3628 of responses. The callback needs a whole bunch of state so set up
3629 a transport-context structure to be passed around. */
3630
3631 if (sx->peer_offered & OPTION_CHUNKING)
3632 {
3633 tctx.check_string = tctx.escape_string = NULL;
3634 tctx.options |= topt_use_bdat;
3635 tctx.chunk_cb = smtp_chunk_cmd_callback;
3636 sx->pending_BDAT = FALSE;
3637 sx->good_RCPT = sx->ok;
3638 sx->cmd_count = 0;
3639 tctx.smtp_context = sx;
3640 }
3641 else
3642 tctx.options |= topt_end_dot;
3643
3644 /* Save the first address of the next batch. */
3645 sx->first_addr = sx->next_addr;
3646
3647 /* Responses from CHUNKING commands go in buffer. Otherwise,
3648 there has not been a response. */
3649
3650 sx->buffer[0] = 0;
3651
3652 sigalrm_seen = FALSE;
3653 transport_write_timeout = ob->data_timeout;
3654 smtp_command = US"sending data block"; /* For error messages */
3655 DEBUG(D_transport|D_v)
3656 if (sx->peer_offered & OPTION_CHUNKING)
3657 debug_printf(" will write message using CHUNKING\n");
3658 else
3659 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3660 transport_count = 0;
3661
3662 #ifndef DISABLE_DKIM
3663 {
3664 # ifdef MEASURE_TIMING
3665 struct timeval t0;
3666 gettimeofday(&t0, NULL);
3667 # endif
3668 dkim_exim_sign_init();
3669 # ifdef EXPERIMENTAL_ARC
3670 {
3671 uschar * s = ob->arc_sign;
3672 if (s)
3673 {
3674 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3675 {
3676 if (!f.expand_string_forcedfail)
3677 {
3678 message = US"failed to expand arc_sign";
3679 sx->ok = FALSE;
3680 goto SEND_FAILED;
3681 }
3682 }
3683 else if (*s)
3684 {
3685 /* Ask dkim code to hash the body for ARC */
3686 (void) arc_ams_setup_sign_bodyhash();
3687 ob->dkim.force_bodyhash = TRUE;
3688 }
3689 }
3690 }
3691 # endif
3692 # ifdef MEASURE_TIMING
3693 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3694 # endif
3695 }
3696 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3697 #else
3698 sx->ok = transport_write_message(&tctx, 0);
3699 #endif
3700
3701 /* transport_write_message() uses write() because it is called from other
3702 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3703 it can exit with "Broken pipe" as its error. This really means that the
3704 socket got closed at the far end. */
3705
3706 transport_write_timeout = 0; /* for subsequent transports */
3707
3708 /* Failure can either be some kind of I/O disaster (including timeout),
3709 or the failure of a transport filter or the expansion of added headers.
3710 Or, when CHUNKING, it can be a protocol-detected failure. */
3711
3712 if (!sx->ok)
3713 if (message) goto SEND_FAILED;
3714 else goto RESPONSE_FAILED;
3715
3716 /* We used to send the terminating "." explicitly here, but because of
3717 buffering effects at both ends of TCP/IP connections, you don't gain
3718 anything by keeping it separate, so it might as well go in the final
3719 data buffer for efficiency. This is now done by setting the topt_end_dot
3720 flag above. */
3721
3722 smtp_command = US"end of data";
3723
3724 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3725 {
3726 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3727 switch(sync_responses(sx, sx->cmd_count-1, 0))
3728 {
3729 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3730 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3731 break;
3732
3733 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3734 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3735 case 0: break; /* No 2xx or 5xx, but no probs */
3736
3737 case -1: goto END_OFF; /* Timeout on RCPT */
3738
3739 #ifndef DISABLE_PIPE_CONNECT
3740 case -5: /* TLS first-read error */
3741 case -4: HDEBUG(D_transport)
3742 debug_printf("failed reaping pipelined cmd responses\n");
3743 #endif
3744 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3745 }
3746 }
3747
3748 #ifndef DISABLE_PRDR
3749 /* For PRDR we optionally get a partial-responses warning followed by the
3750 individual responses, before going on with the overall response. If we don't
3751 get the warning then deal with per non-PRDR. */
3752
3753 if(sx->prdr_active)
3754 {
3755 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3756 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3757 {
3758 case '2': sx->prdr_active = FALSE;
3759 sx->ok = TRUE;
3760 break;
3761 case '4': errno = ERRNO_DATA4XX;
3762 addrlist->more_errno |=
3763 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3764 break;
3765 }
3766 }
3767 else
3768 #endif
3769
3770 /* For non-PRDR SMTP, we now read a single response that applies to the
3771 whole message. If it is OK, then all the addresses have been delivered. */
3772
3773 if (!sx->lmtp)
3774 {
3775 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3776 ob->final_timeout);
3777 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3778 {
3779 errno = ERRNO_DATA4XX;
3780 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3781 }
3782 }
3783
3784 /* For LMTP, we get back a response for every RCPT command that we sent;
3785 some may be accepted and some rejected. For those that get a response, their
3786 status is fixed; any that are accepted have been handed over, even if later
3787 responses crash - at least, that's how I read RFC 2033.
3788
3789 If all went well, mark the recipient addresses as completed, record which
3790 host/IPaddress they were delivered to, and cut out RSET when sending another
3791 message down the same channel. Write the completed addresses to the journal
3792 now so that they are recorded in case there is a crash of hardware or
3793 software before the spool gets updated. Also record the final SMTP
3794 confirmation if needed (for SMTP only). */
3795
3796 if (sx->ok)
3797 {
3798 int flag = '=';
3799 struct timeval delivery_time;
3800 int len;
3801 uschar * conf = NULL;
3802
3803 timesince(&delivery_time, &sx->delivery_start);
3804 sx->send_rset = FALSE;
3805 pipelining_active = FALSE;
3806
3807 /* Set up confirmation if needed - applies only to SMTP */
3808
3809 if (
3810 #ifdef DISABLE_EVENT
3811 LOGGING(smtp_confirmation) &&
3812 #endif
3813 !sx->lmtp
3814 )
3815 {
3816 const uschar *s = string_printing(sx->buffer);
3817 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3818 conf = (s == sx->buffer)? US string_copy(s) : US s;
3819 }
3820
3821 /* Process all transported addresses - for LMTP or PRDR, read a status for
3822 each one. */
3823
3824 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3825 {
3826 if (addr->transport_return != PENDING_OK) continue;
3827
3828 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3829 remaining addresses. Otherwise, it's a return code for just the one
3830 address. For temporary errors, add a retry item for the address so that
3831 it doesn't get tried again too soon. */
3832
3833 #ifndef DISABLE_PRDR
3834 if (sx->lmtp || sx->prdr_active)
3835 #else
3836 if (sx->lmtp)
3837 #endif
3838 {
3839 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3840 ob->final_timeout))
3841 {
3842 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3843 addr->message = string_sprintf(
3844 #ifndef DISABLE_PRDR
3845 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3846 #else
3847 "LMTP error after %s: %s",
3848 #endif
3849 data_command, string_printing(sx->buffer));
3850 setflag(addr, af_pass_message); /* Allow message to go to user */
3851 if (sx->buffer[0] == '5')
3852 addr->transport_return = FAIL;
3853 else
3854 {
3855 errno = ERRNO_DATA4XX;
3856 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3857 addr->transport_return = DEFER;
3858 #ifndef DISABLE_PRDR
3859 if (!sx->prdr_active)
3860 #endif
3861 retry_add_item(addr, addr->address_retry_key, 0);
3862 }
3863 continue;
3864 }
3865 sx->completed_addr = TRUE; /* NOW we can set this flag */
3866 if (LOGGING(smtp_confirmation))
3867 {
3868 const uschar *s = string_printing(sx->buffer);
3869 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3870 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3871 }
3872 }
3873
3874 /* SMTP, or success return from LMTP for this address. Pass back the
3875 actual host that was used. */
3876
3877 addr->transport_return = OK;
3878 addr->host_used = host;
3879 addr->delivery_time = delivery_time;
3880 addr->special_action = flag;
3881 addr->message = conf;
3882
3883 if (tcp_out_fastopen)
3884 {
3885 setflag(addr, af_tcp_fastopen_conn);
3886 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3887 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3888 }
3889 if (sx->pipelining_used) setflag(addr, af_pipelining);
3890 #ifndef DISABLE_PIPE_CONNECT
3891 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
3892 #endif
3893 #ifndef DISABLE_PRDR
3894 if (sx->prdr_active) setflag(addr, af_prdr_used);
3895 #endif
3896 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3897 flag = '-';
3898
3899 #ifndef DISABLE_PRDR
3900 if (!sx->prdr_active)
3901 #endif
3902 {
3903 /* Update the journal. For homonymic addresses, use the base address plus
3904 the transport name. See lots of comments in deliver.c about the reasons
3905 for the complications when homonyms are involved. Just carry on after
3906 write error, as it may prove possible to update the spool file later. */
3907
3908 if (testflag(addr, af_homonym))
3909 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3910 else
3911 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3912
3913 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
3914 len = Ustrlen(CS sx->buffer);
3915 if (write(journal_fd, sx->buffer, len) != len)
3916 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3917 "%s: %s", sx->buffer, strerror(errno));
3918 }
3919 }
3920
3921 #ifndef DISABLE_PRDR
3922 if (sx->prdr_active)
3923 {
3924 const uschar * overall_message;
3925
3926 /* PRDR - get the final, overall response. For any non-success
3927 upgrade all the address statuses. */
3928
3929 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3930 ob->final_timeout);
3931 if (!sx->ok)
3932 {
3933 if(errno == 0 && sx->buffer[0] == '4')
3934 {
3935 errno = ERRNO_DATA4XX;
3936 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3937 }
3938 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3939 if (sx->buffer[0] == '5' || addr->transport_return == OK)
3940 addr->transport_return = PENDING_OK; /* allow set_errno action */
3941 goto RESPONSE_FAILED;
3942 }
3943
3944 /* Append the overall response to the individual PRDR response for logging
3945 and update the journal, or setup retry. */
3946
3947 overall_message = string_printing(sx->buffer);
3948 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3949 if (addr->transport_return == OK)
3950 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3951
3952 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3953 if (addr->transport_return == OK)
3954 {
3955 if (testflag(addr, af_homonym))
3956 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3957 else
3958 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3959
3960 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
3961 len = Ustrlen(CS sx->buffer);
3962 if (write(journal_fd, sx->buffer, len) != len)
3963 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3964 "%s: %s", sx->buffer, strerror(errno));
3965 }
3966 else if (addr->transport_return == DEFER)
3967 retry_add_item(addr, addr->address_retry_key, -2);
3968 }
3969 #endif
3970
3971 /* Ensure the journal file is pushed out to disk. */
3972
3973 if (EXIMfsync(journal_fd) < 0)
3974 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3975 strerror(errno));
3976 }
3977 }
3978
3979
3980 /* Handle general (not specific to one address) failures here. The value of ok
3981 is used to skip over this code on the falling through case. A timeout causes a
3982 deferral. Other errors may defer or fail according to the response code, and
3983 may set up a special errno value, e.g. after connection chopped, which is
3984 assumed if errno == 0 and there is no text in the buffer. If control reaches
3985 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3986 the problem is not related to this specific message. */
3987
3988 if (!sx->ok)
3989 {
3990 int code, set_rc;
3991 uschar * set_message;
3992
3993 RESPONSE_FAILED:
3994 {
3995 save_errno = errno;
3996 message = NULL;
3997 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
3998 sx->buffer, &code, &message, &pass_message);
3999 goto FAILED;
4000 }
4001
4002 SEND_FAILED:
4003 {
4004 save_errno = errno;
4005 code = '4';
4006 message = string_sprintf("send() to %s [%s] failed: %s",
4007 host->name, host->address, message ? message : US strerror(save_errno));
4008 sx->send_quit = FALSE;
4009 goto FAILED;
4010 }
4011
4012 FAILED:
4013 {
4014 BOOL message_error;
4015
4016 sx->ok = FALSE; /* For when reached by GOTO */
4017 set_message = message;
4018
4019 /* We want to handle timeouts after MAIL or "." and loss of connection after
4020 "." specially. They can indicate a problem with the sender address or with
4021 the contents of the message rather than a real error on the connection. These
4022 cases are treated in the same way as a 4xx response. This next bit of code
4023 does the classification. */
4024
4025 switch(save_errno)
4026 {
4027 case 0:
4028 case ERRNO_MAIL4XX:
4029 case ERRNO_DATA4XX:
4030 message_error = TRUE;
4031 break;
4032
4033 case ETIMEDOUT:
4034 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4035 Ustrncmp(smtp_command,"end ",4) == 0;
4036 break;
4037
4038 case ERRNO_SMTPCLOSED:
4039 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4040 break;
4041
4042 default:
4043 message_error = FALSE;
4044 break;
4045 }
4046
4047 /* Handle the cases that are treated as message errors. These are:
4048
4049 (a) negative response or timeout after MAIL
4050 (b) negative response after DATA
4051 (c) negative response or timeout or dropped connection after "."
4052 (d) utf8 support required and not offered
4053
4054 It won't be a negative response or timeout after RCPT, as that is dealt
4055 with separately above. The action in all cases is to set an appropriate
4056 error code for all the addresses, but to leave yield set to OK because the
4057 host itself has not failed. Of course, it might in practice have failed
4058 when we've had a timeout, but if so, we'll discover that at the next
4059 delivery attempt. For a temporary error, set the message_defer flag, and
4060 write to the logs for information if this is not the last host. The error
4061 for the last host will be logged as part of the address's log line. */
4062
4063 if (message_error)
4064 {
4065 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4066
4067 /* If there's an errno, the message contains just the identity of
4068 the host. */
4069
4070 if (code == '5')
4071 set_rc = FAIL;
4072 else /* Anything other than 5 is treated as temporary */
4073 {
4074 set_rc = DEFER;
4075 if (save_errno > 0)
4076 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4077
4078 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4079
4080 *message_defer = TRUE;
4081 }
4082 }
4083
4084 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4085 ".", or some other transportation error. We defer all addresses and yield
4086 DEFER, except for the case of failed add_headers expansion, or a transport
4087 filter failure, when the yield should be ERROR, to stop it trying other
4088 hosts. */
4089
4090 else
4091 {
4092 #ifndef DISABLE_PIPE_CONNECT
4093 /* If we were early-pipelinng and the actual EHLO response did not match
4094 the cached value we assumed, we could have detected it and passed a
4095 custom errno through to here. It would be nice to RSET and retry right
4096 away, but to reliably do that we eould need an extra synch point before
4097 we committed to data and that would discard half the gained roundrips.
4098 Or we could summarily drop the TCP connection. but that is also ugly.
4099 Instead, we ignore the possibility (having freshened the cache) and rely
4100 on the server telling us with a nonmessage error if we have tried to
4101 do something it no longer supports. */
4102 #endif
4103 set_rc = DEFER;
4104 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4105 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4106 }
4107 }
4108
4109 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4110 #ifdef EXPERIMENTAL_DSN_INFO
4111 sx->smtp_greeting, sx->helo_response,
4112 #endif
4113 &sx->delivery_start);
4114 }
4115
4116 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4117 SMTP session tidily. However, if there were too many addresses to send in one
4118 message (indicated by first_addr being non-NULL) we want to carry on with the
4119 rest of them. Also, it is desirable to send more than one message down the SMTP
4120 connection if there are several waiting, provided we haven't already sent so
4121 many as to hit the configured limit. The function transport_check_waiting looks
4122 for a waiting message and returns its id. Then transport_pass_socket tries to
4123 set up a continued delivery by passing the socket on to another process. The
4124 variable send_rset is FALSE if a message has just been successfully transferred.
4125
4126 If we are already sending down a continued channel, there may be further
4127 addresses not yet delivered that are aimed at the same host, but which have not
4128 been passed in this run of the transport. In this case, continue_more will be
4129 true, and all we should do is send RSET if necessary, and return, leaving the
4130 channel open.
4131
4132 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4133 do not want to continue with other messages down the same channel, because that
4134 can lead to looping between two or more messages, all with the same,
4135 temporarily failing address(es). [The retry information isn't updated yet, so
4136 new processes keep on trying.] We probably also don't want to try more of this
4137 message's addresses either.
4138
4139 If we have started a TLS session, we have to end it before passing the
4140 connection to a new process. However, not all servers can handle this (Exim
4141 can), so we do not pass such a connection on if the host matches
4142 hosts_nopass_tls. */
4143
4144 DEBUG(D_transport)
4145 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4146 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4147 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4148
4149 if (sx->completed_addr && sx->ok && sx->send_quit)
4150 {
4151 BOOL more;
4152 smtp_compare_t t_compare;
4153
4154 t_compare.tblock = tblock;
4155 t_compare.current_sender_address = sender_address;
4156
4157 if ( sx->first_addr != NULL
4158 || f.continue_more
4159 || (
4160 #ifndef DISABLE_TLS
4161 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4162 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4163 )
4164 &&
4165 #endif
4166 transport_check_waiting(tblock->name, host->name,
4167 tblock->connection_max_messages, new_message_id, &more,
4168 (oicf)smtp_are_same_identities, (void*)&t_compare)
4169 ) )
4170 {
4171 uschar *msg;
4172 BOOL pass_message;
4173
4174 if (sx->send_rset)
4175 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4176 {
4177 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4178 host->address, strerror(errno));
4179 sx->send_quit = FALSE;
4180 }
4181 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4182 '2', ob->command_timeout)))
4183 {
4184 int code;
4185 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4186 &pass_message);
4187 if (!sx->send_quit)
4188 {
4189 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4190 host->name, host->address, msg);
4191 }
4192 }
4193
4194 /* Either RSET was not needed, or it succeeded */
4195
4196 if (sx->ok)
4197 {
4198 #ifndef DISABLE_TLS
4199 int pfd[2];
4200 #endif
4201 int socket_fd = sx->cctx.sock;
4202
4203
4204 if (sx->first_addr != NULL) /* More addresses still to be sent */
4205 { /* in this run of the transport */
4206 continue_sequence++; /* Causes * in logging */
4207 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4208 goto SEND_MESSAGE;
4209 }
4210
4211 /* Unless caller said it already has more messages listed for this host,
4212 pass the connection on to a new Exim process (below, the call to
4213 transport_pass_socket). If the caller has more ready, just return with
4214 the connection still open. */
4215
4216 #ifndef DISABLE_TLS
4217 if (tls_out.active.sock >= 0)
4218 if ( f.continue_more
4219 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4220 {
4221 /* Before passing the socket on, or returning to caller with it still
4222 open, we must shut down TLS. Not all MTAs allow for the continuation
4223 of the SMTP session when TLS is shut down. We test for this by sending
4224 a new EHLO. If we don't get a good response, we don't attempt to pass
4225 the socket on. */
4226
4227 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4228 sx->cctx.tls_ctx = NULL;
4229 smtp_peer_options = smtp_peer_options_wrap;
4230 sx->ok = !sx->smtps
4231 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4232 >= 0
4233 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4234 '2', ob->command_timeout);
4235
4236 if (sx->ok && f.continue_more)
4237 return yield; /* More addresses for another run */
4238 }
4239 else
4240 {
4241 /* Set up a pipe for proxying TLS for the new transport process */
4242
4243 smtp_peer_options |= OPTION_TLS;
4244 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4245 socket_fd = pfd[1];
4246 else
4247 set_errno(sx->first_addr, errno, US"internal allocation problem",
4248 DEFER, FALSE, host,
4249 # ifdef EXPERIMENTAL_DSN_INFO
4250 sx->smtp_greeting, sx->helo_response,
4251 # endif
4252 &sx->delivery_start);
4253 }
4254 else
4255 #endif
4256 if (f.continue_more)
4257 return yield; /* More addresses for another run */
4258
4259 /* If the socket is successfully passed, we mustn't send QUIT (or
4260 indeed anything!) from here. */
4261
4262 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4263 propagate it from the initial
4264 */
4265 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4266 host->address, new_message_id, socket_fd))
4267 {
4268 sx->send_quit = FALSE;
4269
4270 /* We have passed the client socket to a fresh transport process.
4271 If TLS is still active, we need to proxy it for the transport we
4272 just passed the baton to. Fork a child to to do it, and return to
4273 get logging done asap. Which way to place the work makes assumptions
4274 about post-fork prioritisation which may not hold on all platforms. */
4275 #ifndef DISABLE_TLS
4276 if (tls_out.active.sock >= 0)
4277 {
4278 int pid = fork();
4279 if (pid == 0) /* child; fork again to disconnect totally */
4280 {
4281 testharness_pause_ms(100); /* let parent debug out */
4282 /* does not return */
4283 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4284 ob->command_timeout);
4285 }
4286
4287 if (pid > 0) /* parent */
4288 {
4289 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4290 close(pfd[0]);
4291 /* tidy the inter-proc to disconn the proxy proc */
4292 waitpid(pid, NULL, 0);
4293 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4294 sx->cctx.tls_ctx = NULL;
4295 (void)close(sx->cctx.sock);
4296 sx->cctx.sock = -1;
4297 continue_transport = NULL;
4298 continue_hostname = NULL;
4299 return yield;
4300 }
4301 log_write(0, LOG_PANIC_DIE, "fork failed");
4302 }
4303 #endif
4304 }
4305 }
4306
4307 /* If RSET failed and there are addresses left, they get deferred. */
4308 else
4309 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4310 #ifdef EXPERIMENTAL_DSN_INFO
4311 sx->smtp_greeting, sx->helo_response,
4312 #endif
4313 &sx->delivery_start);
4314 }
4315 }
4316
4317 /* End off tidily with QUIT unless the connection has died or the socket has
4318 been passed to another process. There has been discussion on the net about what
4319 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4320 to wait for a response, but on the other hand, there isn't anything one can do
4321 with an error response, other than log it. Exim used to do that. However,
4322 further discussion suggested that it is positively advantageous not to wait for
4323 the response, but to close the session immediately. This is supposed to move
4324 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4325 load from the server. (Hosts that are both servers and clients may not see much
4326 difference, of course.) Further discussion indicated that this was safe to do
4327 on Unix systems which have decent implementations of TCP/IP that leave the
4328 connection around for a while (TIME_WAIT) after the application has gone away.
4329 This enables the response sent by the server to be properly ACKed rather than
4330 timed out, as can happen on broken TCP/IP implementations on other OS.
4331
4332 This change is being made on 31-Jul-98. After over a year of trouble-free
4333 operation, the old commented-out code was removed on 17-Sep-99. */
4334
4335 SEND_QUIT:
4336 #ifdef TCP_CORK
4337 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4338 #endif
4339 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4340
4341 END_OFF:
4342
4343 #ifndef DISABLE_TLS
4344 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4345 sx->cctx.tls_ctx = NULL;
4346 #endif
4347
4348 /* Close the socket, and return the appropriate value, first setting
4349 works because the NULL setting is passed back to the calling process, and
4350 remote_max_parallel is forced to 1 when delivering over an existing connection,
4351
4352 If all went well and continue_more is set, we shouldn't actually get here if
4353 there are further addresses, as the return above will be taken. However,
4354 writing RSET might have failed, or there may be other addresses whose hosts are
4355 specified in the transports, and therefore not visible at top level, in which
4356 case continue_more won't get set. */
4357
4358 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4359 if (sx->send_quit)
4360 {
4361 shutdown(sx->cctx.sock, SHUT_WR);
4362 millisleep(20);
4363 testharness_pause_ms(200);
4364 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4365 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4366 i--; /* drain socket */
4367 }
4368 (void)close(sx->cctx.sock);
4369
4370 #ifndef DISABLE_EVENT
4371 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4372 #endif
4373
4374 continue_transport = NULL;
4375 continue_hostname = NULL;
4376 return yield;
4377 }
4378
4379
4380
4381
4382 /*************************************************
4383 * Closedown entry point *
4384 *************************************************/
4385
4386 /* This function is called when exim is passed an open smtp channel
4387 from another incarnation, but the message which it has been asked
4388 to deliver no longer exists. The channel is on stdin.
4389
4390 We might do fancy things like looking for another message to send down
4391 the channel, but if the one we sought has gone, it has probably been
4392 delivered by some other process that itself will seek further messages,
4393 so just close down our connection.
4394
4395 Argument: pointer to the transport instance block
4396 Returns: nothing
4397 */
4398
4399 void
4400 smtp_transport_closedown(transport_instance *tblock)
4401 {
4402 smtp_transport_options_block * ob = SOB tblock->options_block;
4403 client_conn_ctx cctx;
4404 smtp_context sx;
4405 uschar buffer[256];
4406 uschar inbuffer[4096];
4407 uschar outbuffer[16];
4408
4409 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4410 cctx.sock = fileno(stdin);
4411 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4412
4413 sx.inblock.cctx = &cctx;
4414 sx.inblock.buffer = inbuffer;
4415 sx.inblock.buffersize = sizeof(inbuffer);
4416 sx.inblock.ptr = inbuffer;
4417 sx.inblock.ptrend = inbuffer;
4418
4419 sx.outblock.cctx = &cctx;
4420 sx.outblock.buffersize = sizeof(outbuffer);
4421 sx.outblock.buffer = outbuffer;
4422 sx.outblock.ptr = outbuffer;
4423 sx.outblock.cmd_count = 0;
4424 sx.outblock.authenticating = FALSE;
4425
4426 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4427 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4428 (void)close(cctx.sock);
4429 }
4430
4431
4432
4433 /*************************************************
4434 * Prepare addresses for delivery *
4435 *************************************************/
4436
4437 /* This function is called to flush out error settings from previous delivery
4438 attempts to other hosts. It also records whether we got here via an MX record
4439 or not in the more_errno field of the address. We are interested only in
4440 addresses that are still marked DEFER - others may have got delivered to a
4441 previously considered IP address. Set their status to PENDING_DEFER to indicate
4442 which ones are relevant this time.
4443
4444 Arguments:
4445 addrlist the list of addresses
4446 host the host we are delivering to
4447
4448 Returns: the first address for this delivery
4449 */
4450
4451 static address_item *
4452 prepare_addresses(address_item *addrlist, host_item *host)
4453 {
4454 address_item *first_addr = NULL;
4455 for (address_item * addr = addrlist; addr; addr = addr->next)
4456 if (addr->transport_return == DEFER)
4457 {
4458 if (!first_addr) first_addr = addr;
4459 addr->transport_return = PENDING_DEFER;
4460 addr->basic_errno = 0;
4461 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4462 addr->message = NULL;
4463 #ifndef DISABLE_TLS
4464 addr->cipher = NULL;
4465 addr->ourcert = NULL;
4466 addr->peercert = NULL;
4467 addr->peerdn = NULL;
4468 addr->ocsp = OCSP_NOT_REQ;
4469 addr->tlsver = NULL;
4470 #endif
4471 #ifdef EXPERIMENTAL_DSN_INFO
4472 addr->smtp_greeting = NULL;
4473 addr->helo_response = NULL;
4474 #endif
4475 }
4476 return first_addr;
4477 }
4478
4479
4480
4481 /*************************************************
4482 * Main entry point *
4483 *************************************************/
4484
4485 /* See local README for interface details. As this is a remote transport, it is
4486 given a chain of addresses to be delivered in one connection, if possible. It
4487 always returns TRUE, indicating that each address has its own independent
4488 status set, except if there is a setting up problem, in which case it returns
4489 FALSE. */
4490
4491 BOOL
4492 smtp_transport_entry(
4493 transport_instance *tblock, /* data for this instantiation */
4494 address_item *addrlist) /* addresses we are working on */
4495 {
4496 int defport;
4497 int hosts_defer = 0;
4498 int hosts_fail = 0;
4499 int hosts_looked_up = 0;
4500 int hosts_retry = 0;
4501 int hosts_serial = 0;
4502 int hosts_total = 0;
4503 int total_hosts_tried = 0;
4504 BOOL expired = TRUE;
4505 uschar *expanded_hosts = NULL;
4506 uschar *pistring;
4507 uschar *tid = string_sprintf("%s transport", tblock->name);
4508 smtp_transport_options_block *ob = SOB tblock->options_block;
4509 host_item *hostlist = addrlist->host_list;
4510 host_item *host = NULL;
4511
4512 DEBUG(D_transport)
4513 {
4514 debug_printf("%s transport entered\n", tblock->name);
4515 for (address_item * addr = addrlist; addr; addr = addr->next)
4516 debug_printf(" %s\n", addr->address);
4517 if (hostlist)
4518 {
4519 debug_printf("hostlist:\n");
4520 for (host_item * host = hostlist; host; host = host->next)
4521 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4522 }
4523 if (continue_hostname)
4524 debug_printf("already connected to %s [%s] (on fd %d)\n",
4525 continue_hostname, continue_host_address,
4526 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4527 }
4528
4529 /* Set the flag requesting that these hosts be added to the waiting
4530 database if the delivery fails temporarily or if we are running with
4531 queue_smtp or a 2-stage queue run. This gets unset for certain
4532 kinds of error, typically those that are specific to the message. */
4533
4534 update_waiting = TRUE;
4535
4536 /* If a host list is not defined for the addresses - they must all have the
4537 same one in order to be passed to a single transport - or if the transport has
4538 a host list with hosts_override set, use the host list supplied with the
4539 transport. It is an error for this not to exist. */
4540
4541 if (!hostlist || (ob->hosts_override && ob->hosts))
4542 {
4543 if (!ob->hosts)
4544 {
4545 addrlist->message = string_sprintf("%s transport called with no hosts set",
4546 tblock->name);
4547 addrlist->transport_return = PANIC;
4548 return FALSE; /* Only top address has status */
4549 }
4550
4551 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4552 ob->hosts);
4553
4554 /* If the transport's host list contains no '$' characters, and we are not
4555 randomizing, it is fixed and therefore a chain of hosts can be built once
4556 and for all, and remembered for subsequent use by other calls to this
4557 transport. If, on the other hand, the host list does contain '$', or we are
4558 randomizing its order, we have to rebuild it each time. In the fixed case,
4559 as the hosts string will never be used again, it doesn't matter that we
4560 replace all the : characters with zeros. */
4561
4562 if (!ob->hostlist)
4563 {
4564 uschar *s = ob->hosts;
4565
4566 if (Ustrchr(s, '$') != NULL)
4567 {
4568 if (!(expanded_hosts = expand_string(s)))
4569 {
4570 addrlist->message = string_sprintf("failed to expand list of hosts "
4571 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4572 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4573 return FALSE; /* Only top address has status */
4574 }
4575 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4576 "\"%s\"\n", s, expanded_hosts);
4577 s = expanded_hosts;
4578 }
4579 else
4580 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4581
4582 if (is_tainted(s))
4583 {
4584 log_write(0, LOG_MAIN|LOG_PANIC,
4585 "attempt to use tainted host list '%s' from '%s' in transport %s",
4586 s, ob->hosts, tblock->name);
4587 /* Avoid leaking info to an attacker */
4588 addrlist->message = US"internal configuration error";
4589 addrlist->transport_return = PANIC;
4590 return FALSE;
4591 }
4592
4593 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4594
4595 /* Check that the expansion yielded something useful. */
4596 if (!hostlist)
4597 {
4598 addrlist->message =
4599 string_sprintf("%s transport has empty hosts setting", tblock->name);
4600 addrlist->transport_return = PANIC;
4601 return FALSE; /* Only top address has status */
4602 }
4603
4604 /* If there was no expansion of hosts, save the host list for
4605 next time. */
4606
4607 if (!expanded_hosts) ob->hostlist = hostlist;
4608 }
4609
4610 /* This is not the first time this transport has been run in this delivery;
4611 the host list was built previously. */
4612
4613 else
4614 hostlist = ob->hostlist;
4615 }
4616
4617 /* The host list was supplied with the address. If hosts_randomize is set, we
4618 must sort it into a random order if it did not come from MX records and has not
4619 already been randomized (but don't bother if continuing down an existing
4620 connection). */
4621
4622 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4623 {
4624 host_item *newlist = NULL;
4625 while (hostlist)
4626 {
4627 host_item *h = hostlist;
4628 hostlist = hostlist->next;
4629
4630 h->sort_key = random_number(100);
4631
4632 if (!newlist)
4633 {
4634 h->next = NULL;
4635 newlist = h;
4636 }
4637 else if (h->sort_key < newlist->sort_key)
4638 {
4639 h->next = newlist;
4640 newlist = h;
4641 }
4642 else
4643 {
4644 host_item *hh = newlist;
4645 while (hh->next)
4646 {
4647 if (h->sort_key < hh->next->sort_key) break;
4648 hh = hh->next;
4649 }
4650 h->next = hh->next;
4651 hh->next = h;
4652 }
4653 }
4654
4655 hostlist = addrlist->host_list = newlist;
4656 }
4657
4658 /* Sort out the default port. */
4659
4660 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4661
4662 /* For each host-plus-IP-address on the list:
4663
4664 . If this is a continued delivery and the host isn't the one with the
4665 current connection, skip.
4666
4667 . If the status is unusable (i.e. previously failed or retry checked), skip.
4668
4669 . If no IP address set, get the address, either by turning the name into
4670 an address, calling gethostbyname if gethostbyname is on, or by calling
4671 the DNS. The DNS may yield multiple addresses, in which case insert the
4672 extra ones into the list.
4673
4674 . Get the retry data if not previously obtained for this address and set the
4675 field which remembers the state of this address. Skip if the retry time is
4676 not reached. If not, remember whether retry data was found. The retry string
4677 contains both the name and the IP address.
4678
4679 . Scan the list of addresses and mark those whose status is DEFER as
4680 PENDING_DEFER. These are the only ones that will be processed in this cycle
4681 of the hosts loop.
4682
4683 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4684 Some addresses may be successfully delivered, others may fail, and yet
4685 others may get temporary errors and so get marked DEFER.
4686
4687 . The return from the delivery attempt is OK if a connection was made and a
4688 valid SMTP dialogue was completed. Otherwise it is DEFER.
4689
4690 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4691
4692 . If fail to connect, or other defer state, add a retry item.
4693
4694 . If there are any addresses whose status is still DEFER, carry on to the
4695 next host/IPaddress, unless we have tried the number of hosts given
4696 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4697 there is some fancy logic for hosts_max_try that means its limit can be
4698 overstepped in some circumstances.
4699
4700 If we get to the end of the list, all hosts have deferred at least one address,
4701 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4702 delivery attempt to those hosts whose last try was before the arrival time of
4703 the current message. To cope with this, we have to go round the loop a second
4704 time. After that, set the status and error data for any addresses that haven't
4705 had it set already. */
4706
4707 for (int cutoff_retry = 0;
4708 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4709 cutoff_retry++)
4710 {
4711 host_item *nexthost = NULL;
4712 int unexpired_hosts_tried = 0;
4713 BOOL continue_host_tried = FALSE;
4714
4715 retry_non_continued:
4716 for (host = hostlist;
4717 host
4718 && unexpired_hosts_tried < ob->hosts_max_try
4719 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4720 host = nexthost)
4721 {
4722 int rc;
4723 int host_af;
4724 BOOL host_is_expired = FALSE;
4725 BOOL message_defer = FALSE;
4726 BOOL some_deferred = FALSE;
4727 address_item *first_addr = NULL;
4728 uschar *interface = NULL;
4729 uschar *retry_host_key = NULL;
4730 uschar *retry_message_key = NULL;
4731 uschar *serialize_key = NULL;
4732
4733 /* Default next host is next host. :-) But this can vary if the
4734 hosts_max_try limit is hit (see below). It may also be reset if a host
4735 address is looked up here (in case the host was multihomed). */
4736
4737 nexthost = host->next;
4738
4739 /* If the address hasn't yet been obtained from the host name, look it up
4740 now, unless the host is already marked as unusable. If it is marked as
4741 unusable, it means that the router was unable to find its IP address (in
4742 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4743 the lookup failed last time. We don't get this far if *all* MX records
4744 point to non-existent hosts; that is treated as a hard error.
4745
4746 We can just skip this host entirely. When the hosts came from the router,
4747 the address will timeout based on the other host(s); when the address is
4748 looked up below, there is an explicit retry record added.
4749
4750 Note that we mustn't skip unusable hosts if the address is not unset; they
4751 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4752
4753 if (!host->address)
4754 {
4755 int new_port, flags;
4756
4757 if (host->status >= hstatus_unusable)
4758 {
4759 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4760 host->name);
4761 continue;
4762 }
4763
4764 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4765
4766 /* The host name is permitted to have an attached port. Find it, and
4767 strip it from the name. Just remember it for now. */
4768
4769 new_port = host_item_get_port(host);
4770
4771 /* Count hosts looked up */
4772
4773 hosts_looked_up++;
4774
4775 /* Find by name if so configured, or if it's an IP address. We don't
4776 just copy the IP address, because we need the test-for-local to happen. */
4777
4778 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4779 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4780 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4781
4782 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4783 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4784 else
4785 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4786 &ob->dnssec, /* domains for request/require */
4787 NULL, NULL);
4788
4789 /* Update the host (and any additional blocks, resulting from
4790 multihoming) with a host-specific port, if any. */
4791
4792 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4793
4794 /* Failure to find the host at this time (usually DNS temporary failure)
4795 is really a kind of routing failure rather than a transport failure.
4796 Therefore we add a retry item of the routing kind, not to stop us trying
4797 to look this name up here again, but to ensure the address gets timed
4798 out if the failures go on long enough. A complete failure at this point
4799 commonly points to a configuration error, but the best action is still
4800 to carry on for the next host. */
4801
4802 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4803 {
4804 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4805 expired = FALSE;
4806 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4807 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4808 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4809 host->status = hstatus_unusable;
4810
4811 for (address_item * addr = addrlist; addr; addr = addr->next)
4812 {
4813 if (addr->transport_return != DEFER) continue;
4814 addr->basic_errno = ERRNO_UNKNOWNHOST;
4815 addr->message = string_sprintf(
4816 rc == HOST_FIND_SECURITY
4817 ? "lookup of IP address for %s was insecure"
4818 : "failed to lookup IP address for %s",
4819 host->name);
4820 }
4821 continue;
4822 }
4823
4824 /* If the host is actually the local host, we may have a problem, or
4825 there may be some cunning configuration going on. In the problem case,
4826 log things and give up. The default transport status is already DEFER. */
4827
4828 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4829 {
4830 for (address_item * addr = addrlist; addr; addr = addr->next)
4831 {
4832 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4833 addr->message = string_sprintf("%s transport found host %s to be "
4834 "local", tblock->name, host->name);
4835 }
4836 goto END_TRANSPORT;
4837 }
4838 } /* End of block for IP address lookup */
4839
4840 /* If this is a continued delivery, we are interested only in the host
4841 which matches the name of the existing open channel. The check is put
4842 here after the local host lookup, in case the name gets expanded as a
4843 result of the lookup. Set expired FALSE, to save the outer loop executing
4844 twice. */
4845
4846 if (continue_hostname)
4847 if ( Ustrcmp(continue_hostname, host->name) != 0
4848 || Ustrcmp(continue_host_address, host->address) != 0
4849 )
4850 {
4851 expired = FALSE;
4852 continue; /* With next host */
4853 }
4854 else
4855 continue_host_tried = TRUE;
4856
4857 /* Reset the default next host in case a multihomed host whose addresses
4858 are not looked up till just above added to the host list. */
4859
4860 nexthost = host->next;
4861
4862 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4863 domain is in queue_smtp_domains, we don't actually want to attempt any
4864 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4865 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4866 were not in it. We don't want to hold up all SMTP deliveries! Except when
4867 doing a two-stage queue run, don't do this if forcing. */
4868
4869 if ( (!f.deliver_force || f.queue_2stage)
4870 && ( f.queue_smtp
4871 || match_isinlist(addrlist->domain,
4872 CUSS &queue_smtp_domains, 0,
4873 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
4874 )
4875 {
4876 DEBUG(D_transport) debug_printf("first-pass routing only\n");
4877 expired = FALSE;
4878 for (address_item * addr = addrlist; addr; addr = addr->next)
4879 if (addr->transport_return == DEFER)
4880 addr->message = US"first-pass only routing due to -odqs, "
4881 "queue_smtp_domains or control=queue";
4882 continue; /* With next host */
4883 }
4884
4885 /* Count hosts being considered - purely for an intelligent comment
4886 if none are usable. */
4887
4888 hosts_total++;
4889
4890 /* Set $host and $host address now in case they are needed for the
4891 interface expansion or the serialize_hosts check; they remain set if an
4892 actual delivery happens. */
4893
4894 deliver_host = host->name;
4895 deliver_host_address = host->address;
4896 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4897 : host->dnssec == DS_NO ? US"no"
4898 : US"";
4899
4900 /* Set up a string for adding to the retry key if the port number is not
4901 the standard SMTP port. A host may have its own port setting that overrides
4902 the default. */
4903
4904 pistring = string_sprintf(":%d", host->port == PORT_NONE
4905 ? defport : host->port);
4906 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4907
4908 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4909 string is set, even if constant (as different transports can have different
4910 constant settings), we must add it to the key that is used for retries,
4911 because connections to the same host from a different interface should be
4912 treated separately. */
4913
4914 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4915 {
4916 uschar * s = ob->interface;
4917 if (s && *s)
4918 {
4919 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4920 return FALSE;
4921 pistring = string_sprintf("%s/%s", pistring, interface);
4922 }
4923 }
4924
4925 /* The first time round the outer loop, check the status of the host by
4926 inspecting the retry data. The second time round, we are interested only
4927 in expired hosts that haven't been tried since this message arrived. */
4928
4929 if (cutoff_retry == 0)
4930 {
4931 BOOL incl_ip;
4932 /* Ensure the status of the address is set by checking retry data if
4933 necessary. There may be host-specific retry data (applicable to all
4934 messages) and also data for retries of a specific message at this host.
4935 If either of these retry records are actually read, the keys used are
4936 returned to save recomputing them later. */
4937
4938 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4939 US"retry_include_ip_address", ob->retry_include_ip_address,
4940 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4941 continue; /* with next host */
4942
4943 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4944 incl_ip, &retry_host_key, &retry_message_key);
4945
4946 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4947 host->address ? host->address : US"", pistring,
4948 host->status == hstatus_usable ? "usable"
4949 : host->status == hstatus_unusable ? "unusable"
4950 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4951
4952 /* Skip this address if not usable at this time, noting if it wasn't
4953 actually expired, both locally and in the address. */
4954
4955 switch (host->status)
4956 {
4957 case hstatus_unusable:
4958 expired = FALSE;
4959 setflag(addrlist, af_retry_skipped);
4960 /* Fall through */
4961
4962 case hstatus_unusable_expired:
4963 switch (host->why)
4964 {
4965 case hwhy_retry: hosts_retry++; break;
4966 case hwhy_failed: hosts_fail++; break;
4967 case hwhy_insecure:
4968 case hwhy_deferred: hosts_defer++; break;
4969 }
4970
4971 /* If there was a retry message key, implying that previously there
4972 was a message-specific defer, we don't want to update the list of
4973 messages waiting for these hosts. */
4974
4975 if (retry_message_key) update_waiting = FALSE;
4976 continue; /* With the next host or IP address */
4977 }
4978 }
4979
4980 /* Second time round the loop: if the address is set but expired, and
4981 the message is newer than the last try, let it through. */
4982
4983 else
4984 {
4985 if ( !host->address
4986 || host->status != hstatus_unusable_expired
4987 || host->last_try > received_time.tv_sec)
4988 continue;
4989 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4990 host->name, host->address, pistring);
4991 host_is_expired = TRUE;
4992 }
4993
4994 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4995 it remains TRUE only if all hosts are expired and none are actually tried.
4996 */
4997
4998 expired = FALSE;
4999
5000 /* If this host is listed as one to which access must be serialized,
5001 see if another Exim process has a connection to it, and if so, skip
5002 this host. If not, update the database to record our connection to it
5003 and remember this for later deletion. Do not do any of this if we are
5004 sending the message down a pre-existing connection. */
5005
5006 if ( !continue_hostname
5007 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5008 {
5009 serialize_key = string_sprintf("host-serialize-%s", host->name);
5010 if (!enq_start(serialize_key, 1))
5011 {
5012 DEBUG(D_transport)
5013 debug_printf("skipping host %s because another Exim process "
5014 "is connected to it\n", host->name);
5015 hosts_serial++;
5016 continue;
5017 }
5018 }
5019
5020 /* OK, we have an IP address that is not waiting for its retry time to
5021 arrive (it might be expired) OR (second time round the loop) we have an
5022 expired host that hasn't been tried since the message arrived. Have a go
5023 at delivering the message to it. First prepare the addresses by flushing
5024 out the result of previous attempts, and finding the first address that
5025 is still to be delivered. */
5026
5027 first_addr = prepare_addresses(addrlist, host);
5028
5029 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5030 message_id, host->name, host->address, addrlist->address,
5031 addrlist->next ? ", ..." : "");
5032
5033 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5034 message_id, host->name, host->address, pistring, addrlist->address,
5035 addrlist->next ? ", ..." : "");
5036
5037 /* This is not for real; don't do the delivery. If there are
5038 any remaining hosts, list them. */
5039
5040 if (f.dont_deliver)
5041 {
5042 struct timeval now;
5043 gettimeofday(&now, NULL);
5044 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5045 for (address_item * addr = addrlist; addr; addr = addr->next)
5046 {
5047 addr->host_used = host;
5048 addr->special_action = '*';
5049 addr->message = US"delivery bypassed by -N option";
5050 }
5051 DEBUG(D_transport)
5052 {
5053 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5054 "*** host and remaining hosts:\n", tblock->name);
5055 for (host_item * host2 = host; host2; host2 = host2->next)
5056 debug_printf(" %s [%s]\n", host2->name,
5057 host2->address ? host2->address : US"unset");
5058 }
5059 rc = OK;
5060 }
5061
5062 /* This is for real. If the host is expired, we don't count it for
5063 hosts_max_retry. This ensures that all hosts must expire before an address
5064 is timed out, unless hosts_max_try_hardlimit (which protects against
5065 lunatic DNS configurations) is reached.
5066
5067 If the host is not expired and we are about to hit the hosts_max_retry
5068 limit, check to see if there is a subsequent hosts with a different MX
5069 value. If so, make that the next host, and don't count this one. This is a
5070 heuristic to make sure that different MXs do get tried. With a normal kind
5071 of retry rule, they would get tried anyway when the earlier hosts were
5072 delayed, but if the domain has a "retry every time" type of rule - as is
5073 often used for the the very large ISPs, that won't happen. */
5074
5075 else
5076 {
5077 host_item * thost;
5078 /* Make a copy of the host if it is local to this invocation
5079 of the transport. */
5080
5081 if (expanded_hosts)
5082 {
5083 thost = store_get(sizeof(host_item), FALSE);
5084 *thost = *host;
5085 thost->name = string_copy(host->name);
5086 thost->address = string_copy(host->address);
5087 }
5088 else
5089 thost = host;
5090
5091 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5092 {
5093 DEBUG(D_transport)
5094 debug_printf("hosts_max_try limit reached with this host\n");
5095 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5096 {
5097 nexthost = h;
5098 unexpired_hosts_tried--;
5099 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5100 "and will be tried\n");
5101 break;
5102 }
5103 }
5104
5105 /* Attempt the delivery. */
5106
5107 total_hosts_tried++;
5108 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5109 &message_defer, FALSE);
5110
5111 /* Yield is one of:
5112 OK => connection made, each address contains its result;
5113 message_defer is set for message-specific defers (when all
5114 recipients are marked defer)
5115 DEFER => there was a non-message-specific delivery problem;
5116 ERROR => there was a problem setting up the arguments for a filter,
5117 or there was a problem with expanding added headers
5118 */
5119
5120 /* If the result is not OK, there was a non-message-specific problem.
5121 If the result is DEFER, we need to write to the logs saying what happened
5122 for this particular host, except in the case of authentication and TLS
5123 failures, where the log has already been written. If all hosts defer a
5124 general message is written at the end. */
5125
5126 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5127 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5128 write_logs(host, first_addr->message, first_addr->basic_errno);
5129
5130 #ifndef DISABLE_EVENT
5131 if (rc == DEFER)
5132 deferred_event_raise(first_addr, host, US"msg:host:defer");
5133 #endif
5134
5135 /* If STARTTLS was accepted, but there was a failure in setting up the
5136 TLS session (usually a certificate screwup), and the host is not in
5137 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5138 TLS forcibly turned off. We have to start from scratch with a new SMTP
5139 connection. That's why the retry is done from here, not from within
5140 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5141 session, so the in-clear transmission after those errors, if permitted,
5142 happens inside smtp_deliver().] */
5143
5144 #ifndef DISABLE_TLS
5145 if ( rc == DEFER
5146 && first_addr->basic_errno == ERRNO_TLSFAILURE
5147 && ob->tls_tempfail_tryclear
5148 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5149 )
5150 {
5151 log_write(0, LOG_MAIN,
5152 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5153 first_addr->message, host->name, host->address);
5154 first_addr = prepare_addresses(addrlist, host);
5155 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5156 &message_defer, TRUE);
5157 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5158 write_logs(host, first_addr->message, first_addr->basic_errno);
5159 # ifndef DISABLE_EVENT
5160 if (rc == DEFER)
5161 deferred_event_raise(first_addr, host, US"msg:host:defer");
5162 # endif
5163 }
5164 #endif /*DISABLE_TLS*/
5165
5166 #ifndef DISABLE_EVENT
5167 /* If the last host gave a defer raise a per-message event */
5168
5169 if (!nexthost && (message_defer || rc == DEFER))
5170 deferred_event_raise(first_addr, host, US"msg:defer");
5171 #endif
5172 }
5173
5174 /* Delivery attempt finished */
5175
5176 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5177 message_id, host->name, host->address, pistring, addrlist->address,
5178 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5179
5180 /* Release serialization if set up */
5181
5182 if (serialize_key) enq_end(serialize_key);
5183
5184 /* If the result is DEFER, or if a host retry record is known to exist, we
5185 need to add an item to the retry chain for updating the retry database
5186 at the end of delivery. We only need to add the item to the top address,
5187 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5188 for any other delivery attempts using the same address. (It is copied into
5189 the unusable tree at the outer level, so even if different address blocks
5190 contain the same address, it still won't get tried again.) */
5191
5192 if (rc == DEFER || retry_host_key)
5193 {
5194 int delete_flag = rc != DEFER ? rf_delete : 0;
5195 if (!retry_host_key)
5196 {
5197 BOOL incl_ip;
5198 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5199 US"retry_include_ip_address", ob->retry_include_ip_address,
5200 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5201 incl_ip = TRUE; /* error; use most-specific retry record */
5202
5203 retry_host_key = incl_ip
5204 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5205 : string_sprintf("T:%S%s", host->name, pistring);
5206 }
5207
5208 /* If a delivery of another message over an existing SMTP connection
5209 yields DEFER, we do NOT set up retry data for the host. This covers the
5210 case when there are delays in routing the addresses in the second message
5211 that are so long that the server times out. This is alleviated by not
5212 routing addresses that previously had routing defers when handling an
5213 existing connection, but even so, this case may occur (e.g. if a
5214 previously happily routed address starts giving routing defers). If the
5215 host is genuinely down, another non-continued message delivery will
5216 notice it soon enough. */
5217
5218 if (delete_flag != 0 || !continue_hostname)
5219 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5220
5221 /* We may have tried an expired host, if its retry time has come; ensure
5222 the status reflects the expiry for the benefit of any other addresses. */
5223
5224 if (rc == DEFER)
5225 {
5226 host->status = host_is_expired
5227 ? hstatus_unusable_expired : hstatus_unusable;
5228 host->why = hwhy_deferred;
5229 }
5230 }
5231
5232 /* If message_defer is set (host was OK, but every recipient got deferred
5233 because of some message-specific problem), or if that had happened
5234 previously so that a message retry key exists, add an appropriate item
5235 to the retry chain. Note that if there was a message defer but now there is
5236 a host defer, the message defer record gets deleted. That seems perfectly
5237 reasonable. Also, stop the message from being remembered as waiting
5238 for specific hosts. */
5239
5240 if (message_defer || retry_message_key)
5241 {
5242 int delete_flag = message_defer ? 0 : rf_delete;
5243 if (!retry_message_key)
5244 {
5245 BOOL incl_ip;
5246 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5247 US"retry_include_ip_address", ob->retry_include_ip_address,
5248 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5249 incl_ip = TRUE; /* error; use most-specific retry record */
5250
5251 retry_message_key = incl_ip
5252 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5253 message_id)
5254 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5255 }
5256 retry_add_item(addrlist, retry_message_key,
5257 rf_message | rf_host | delete_flag);
5258 update_waiting = FALSE;
5259 }
5260
5261 /* Any return other than DEFER (that is, OK or ERROR) means that the
5262 addresses have got their final statuses filled in for this host. In the OK
5263 case, see if any of them are deferred. */
5264
5265 if (rc == OK)
5266 for (address_item * addr = addrlist; addr; addr = addr->next)
5267 if (addr->transport_return == DEFER)
5268 {
5269 some_deferred = TRUE;
5270 break;
5271 }
5272
5273 /* If no addresses deferred or the result was ERROR, return. We do this for
5274 ERROR because a failing filter set-up or add_headers expansion is likely to
5275 fail for any host we try. */
5276
5277 if (rc == ERROR || (rc == OK && !some_deferred))
5278 {
5279 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5280 return TRUE; /* Each address has its status */
5281 }
5282
5283 /* If the result was DEFER or some individual addresses deferred, let
5284 the loop run to try other hosts with the deferred addresses, except for the
5285 case when we were trying to deliver down an existing channel and failed.
5286 Don't try any other hosts in this case. */
5287
5288 if (continue_hostname) break;
5289
5290 /* If the whole delivery, or some individual addresses, were deferred and
5291 there are more hosts that could be tried, do not count this host towards
5292 the hosts_max_try limit if the age of the message is greater than the
5293 maximum retry time for this host. This means we may try try all hosts,
5294 ignoring the limit, when messages have been around for some time. This is
5295 important because if we don't try all hosts, the address will never time
5296 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5297
5298 if ((rc == DEFER || some_deferred) && nexthost)
5299 {
5300 BOOL timedout;
5301 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5302
5303 if (retry && retry->rules)
5304 {
5305 retry_rule *last_rule;
5306 for (last_rule = retry->rules;
5307 last_rule->next;
5308 last_rule = last_rule->next);
5309 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5310 }
5311 else timedout = TRUE; /* No rule => timed out */
5312
5313 if (timedout)
5314 {
5315 unexpired_hosts_tried--;
5316 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5317 "hosts_max_try (message older than host's retry time)\n");
5318 }
5319 }
5320
5321 DEBUG(D_transport)
5322 {
5323 if (unexpired_hosts_tried >= ob->hosts_max_try)
5324 debug_printf("reached transport hosts_max_try limit %d\n",
5325 ob->hosts_max_try);
5326 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5327 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5328 ob->hosts_max_try_hardlimit);
5329 }
5330
5331 testharness_pause_ms(500); /* let server debug out */
5332 } /* End of loop for trying multiple hosts. */
5333
5334 /* If we failed to find a matching host in the list, for an already-open
5335 connection, just close it and start over with the list. This can happen
5336 for routing that changes from run to run, or big multi-IP sites with
5337 round-robin DNS. */
5338
5339 if (continue_hostname && !continue_host_tried)
5340 {
5341 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5342
5343 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5344 #ifndef DISABLE_TLS
5345 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5346 transport */
5347 /*XXX doublecheck that! */
5348
5349 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5350 {
5351 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5352 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5353 cutthrough.cctx.tls_ctx = NULL;
5354 cutthrough.is_tls = FALSE;
5355 }
5356 else
5357 #else
5358 (void) write(fd, US"QUIT\r\n", 6);
5359 #endif
5360 (void) close(fd);
5361 cutthrough.cctx.sock = -1;
5362 continue_hostname = NULL;
5363 goto retry_non_continued;
5364 }
5365
5366 /* This is the end of the loop that repeats iff expired is TRUE and
5367 ob->delay_after_cutoff is FALSE. The second time round we will
5368 try those hosts that haven't been tried since the message arrived. */
5369
5370 DEBUG(D_transport)
5371 {
5372 debug_printf("all IP addresses skipped or deferred at least one address\n");
5373 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5374 debug_printf("retrying IP addresses not tried since message arrived\n");
5375 }
5376 }
5377
5378
5379 /* Get here if all IP addresses are skipped or defer at least one address. In
5380 MUA wrapper mode, this will happen only for connection or other non-message-
5381 specific failures. Force the delivery status for all addresses to FAIL. */
5382
5383 if (mua_wrapper)
5384 {
5385 for (address_item * addr = addrlist; addr; addr = addr->next)
5386 addr->transport_return = FAIL;
5387 goto END_TRANSPORT;
5388 }
5389
5390 /* In the normal, non-wrapper case, add a standard message to each deferred
5391 address if there hasn't been an error, that is, if it hasn't actually been
5392 tried this time. The variable "expired" will be FALSE if any deliveries were
5393 actually tried, or if there was at least one host that was not expired. That
5394 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5395 a delivery has been tried, an error code will be set, and the failing of the
5396 message is handled by the retry code later.
5397
5398 If queue_smtp is set, or this transport was called to send a subsequent message
5399 down an existing TCP/IP connection, and something caused the host not to be
5400 found, we end up here, but can detect these cases and handle them specially. */
5401
5402 for (address_item * addr = addrlist; addr; addr = addr->next)
5403 {
5404 /* If host is not NULL, it means that we stopped processing the host list
5405 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5406 means we need to behave as if some hosts were skipped because their retry
5407 time had not come. Specifically, this prevents the address from timing out.
5408 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5409 hosts were tried. */
5410
5411 if (host)
5412 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5413 {
5414 DEBUG(D_transport)
5415 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5416 "hosts were tried\n");
5417 }
5418 else
5419 {
5420 DEBUG(D_transport)
5421 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5422 setflag(addr, af_retry_skipped);
5423 }
5424
5425 if (f.queue_smtp) /* no deliveries attempted */
5426 {
5427 addr->transport_return = DEFER;
5428 addr->basic_errno = 0;
5429 addr->message = US"SMTP delivery explicitly queued";
5430 }
5431
5432 else if ( addr->transport_return == DEFER
5433 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5434 && !addr->message
5435 )
5436 {
5437 addr->basic_errno = ERRNO_HRETRY;
5438 if (continue_hostname)
5439 addr->message = US"no host found for existing SMTP connection";
5440 else if (expired)
5441 {
5442 setflag(addr, af_pass_message); /* This is not a security risk */
5443 addr->message = string_sprintf(
5444 "all hosts%s have been failing for a long time %s",
5445 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5446 ob->delay_after_cutoff
5447 ? US"(and retry time not reached)"
5448 : US"and were last tried after this message arrived");
5449
5450 /* If we are already using fallback hosts, or there are no fallback hosts
5451 defined, convert the result to FAIL to cause a bounce. */
5452
5453 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5454 addr->transport_return = FAIL;
5455 }
5456 else
5457 {
5458 const char * s;
5459 if (hosts_retry == hosts_total)
5460 s = "retry time not reached for any host%s";
5461 else if (hosts_fail == hosts_total)
5462 s = "all host address lookups%s failed permanently";
5463 else if (hosts_defer == hosts_total)
5464 s = "all host address lookups%s failed temporarily";
5465 else if (hosts_serial == hosts_total)
5466 s = "connection limit reached for all hosts%s";
5467 else if (hosts_fail+hosts_defer == hosts_total)
5468 s = "all host address lookups%s failed";
5469 else
5470 s = "some host address lookups failed and retry time "
5471 "not reached for other hosts or connection limit reached%s";
5472
5473 addr->message = string_sprintf(s,
5474 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5475 }
5476 }
5477 }
5478
5479 /* Update the database which keeps information about which messages are waiting
5480 for which hosts to become available. For some message-specific errors, the
5481 update_waiting flag is turned off because we don't want follow-on deliveries in
5482 those cases. If this transport instance is explicitly limited to one message
5483 per connection then follow-on deliveries are not possible and there's no need
5484 to create/update the per-transport wait-<transport_name> database. */
5485
5486 if (update_waiting && tblock->connection_max_messages != 1)
5487 transport_update_waiting(hostlist, tblock->name);
5488
5489 END_TRANSPORT:
5490
5491 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5492
5493 return TRUE; /* Each address has its status */
5494 }
5495
5496 #endif /*!MACRO_PREDEF*/
5497 /* vi: aw ai sw=2
5498 */
5499 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.