Capture substrings in ACL regex= . Bug 425.
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH
1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
3386088d 5/* Copyright (c) University of Cambridge 1995 - 2015 */
0756eb3c
PH
6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
506900af
JH
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
9c695f6d
JH
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
48c7f9e2
PH
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
0756eb3c
PH
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
382afc6b
PH
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
0756eb3c
PH
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 45#ifndef DISABLE_DKIM
f7572e5a
TK
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 58#endif
0756eb3c
PH
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
9e4f5962
PP
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
0756eb3c
PH
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 75#ifdef SUPPORT_TLS
b1770b6e 76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
2d571266 77 ignore; 4.83 will warn, and a later-still release will remove
17c76198 78 these options, so that using them becomes an error. */
83da1223
PH
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 85#endif
0756eb3c
PH
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 94#ifdef SUPPORT_TLS
0756eb3c
PH
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 97#endif
0756eb3c
PH
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 102#ifdef SUPPORT_TLS
0756eb3c
PH
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 105#endif
0756eb3c
PH
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 110#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
44662487
JH
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113#endif
0756eb3c
PH
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 116#ifdef SUPPORT_TLS
7a31d643
JH
117# ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120# endif
f2de3a33 121# ifndef DISABLE_OCSP
f5d78688
JH
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124# endif
0756eb3c
PH
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 127#endif
0756eb3c
PH
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 130#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
96e47838
TL
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133#endif
8ccd00b1 134#ifndef DISABLE_PRDR
fd98a5c6
JH
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137#endif
99400968
JH
138#ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141#endif
0756eb3c
PH
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
506900af 150 { "multi_domain", opt_expand_bool | opt_public,
0756eb3c
PH
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 156 { "retry_include_ip_address", opt_expand_bool,
0756eb3c
PH
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
7eb6c37c
JH
162#ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165#endif
80a47a2c 166#ifdef SUPPORT_TLS
0756eb3c
PH
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 175 { "tls_require_ciphers", opt_stringptr,
0756eb3c 176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
a63be306
WB
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
e51c7be2
JH
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 185 { "tls_verify_certificates", opt_stringptr,
a63be306
WB
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 189#endif
0756eb3c
PH
190};
191
192/* Size of the options list. An extern variable has to be used so that its
193address can appear in the tables drtables.c. */
194
195int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198/* Default private options block for the smtp transport. */
199
200smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
9e4f5962 210 NULL, /* DSCP */
0756eb3c
PH
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
96e47838
TL
214#ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
7a31d643 216 NULL, /* hosts_require_dane */
96e47838 217#endif
8ccd00b1 218#ifndef DISABLE_PRDR
ad07e9ad 219 US"*", /* hosts_try_prdr */
fd98a5c6 220#endif
f2de3a33 221#ifndef DISABLE_OCSP
0e66b3b6 222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688
JH
223 NULL, /* hosts_require_ocsp */
224#endif
0756eb3c
PH
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
6c9ed72e 227 NULL, /* hosts_verify_avoid_tls */
c51b8e75 228 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
8e669ac1 237 50, /* hosts_max_try_hardlimit */
48c7f9e2 238 TRUE, /* address_retry_include_sender */
0756eb3c 239 FALSE, /* allow_localhost */
382afc6b 240 FALSE, /* authenticated_sender_force */
0756eb3c
PH
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
0539a19d 244 { NULL, NULL }, /* dnssec_domains {request,require} */
0756eb3c
PH
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
f1513293 249 FALSE, /* lmtp_ignore_quota */
9c695f6d 250 NULL, /* expand_retry_include_ip_address */
0756eb3c 251 TRUE /* retry_include_ip_address */
7eb6c37c 252#ifdef EXPERIMENTAL_SOCKS
7eb6c37c 253 ,NULL /* socks_proxy */
b8bf753b 254#endif
80a47a2c 255#ifdef SUPPORT_TLS
0756eb3c
PH
256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
83da1223
PH
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
54c90be1 263 NULL, /* tls_sni */
0e0f3f56 264 US"system", /* tls_verify_certificates */
54c90be1
PP
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
a63be306
WB
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
610ff438 269 US"*", /* tls_try_verify_hosts */
01a4a5c5 270 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK
271#endif
272#ifndef DISABLE_DKIM
f7572e5a
TK
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
80a47a2c 279#endif
0756eb3c
PH
280};
281
6c1c3d1d
WB
282/* some DSN flags for use later */
283
284static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
45500060 287static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB
288
289
0756eb3c
PH
290
291/* Local statics */
292
293static uschar *smtp_command; /* Points to last cmd for error messages */
294static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 295static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH
296
297
298/*************************************************
299* Setup entry point *
300*************************************************/
301
302/* This function is called when the transport is about to be used,
303but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
0756eb3c
PH
308
309Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
929ba01c
PH
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
0756eb3c
PH
315 errmsg place for error message (not used)
316
317Returns: OK always (FAIL, DEFER not used)
318*/
319
320static int
321smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH
323{
324smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH
328uid = uid;
329gid = gid;
0756eb3c
PH
330
331/* Pass back options if required. This interface is getting very messy. */
332
333if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
26da7e20 344 tf->helo_data = ob->helo_data;
0756eb3c
PH
345 }
346
347/* Set the fallback host list for all the addresses that don't have fallback
348host lists, provided that the local host wasn't present in the original host
349list. */
350
351if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358return OK;
359}
360
361
362
363/*************************************************
364* Initialization entry point *
365*************************************************/
366
367/* Called for each instance, after its options have been read, to
368enable consistency checks to be done, or anything else that needs
369to be set up.
370
371Argument: pointer to the transport instance block
372Returns: nothing
373*/
374
375void
376smtp_transport_init(transport_instance *tblock)
377{
378smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381/* Retry_use_local_part defaults FALSE if unset */
382
383if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386/* Set the default port according to the protocol */
387
388if (ob->port == NULL)
061b7ebd
PP
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH
391
392/* Set up the setup entry point, to be called before subprocesses for this
393transport. */
394
395tblock->setup = smtp_transport_setup;
396
397/* Complain if any of the timeouts are zero. */
398
399if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405/* If hosts_override is set and there are local hosts, set the global
406flag that stops verify from showing router hosts. */
407
408if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410/* If there are any fallback hosts listed, build a chain of host items
411for them, but do not do any lookups at this time. */
412
413host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 414
32d07012 415#ifdef SUPPORT_TLS
2d571266
JH
416if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
32d07012 422#endif
0756eb3c
PH
423}
424
425
426
427
428
429/*************************************************
430* Set delivery info into all active addresses *
431*************************************************/
432
433/* Only addresses whose status is >= PENDING are relevant. A lesser
434status means that an address is not currently being processed.
435
436Arguments:
447d236c
PH
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 442 host if set, mark addrs as having used this host
0756eb3c
PH
443
444If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446this particular type of timeout.
447
448Returns: nothing
449*/
450
7cd1141b
PH
451static void
452set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
c562fd30 453 BOOL pass_message, host_item * host)
0756eb3c
PH
454{
455address_item *addr;
456int orvalue = 0;
457if (errno_value == ERRNO_CONNECTTIMEOUT)
458 {
459 errno_value = ETIMEDOUT;
460 orvalue = RTEF_CTOUT;
461 }
462for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b 463 if (addr->transport_return >= PENDING)
447d236c 464 {
168dec3b
JH
465 addr->basic_errno = errno_value;
466 addr->more_errno |= orvalue;
467 if (msg != NULL)
468 {
469 addr->message = msg;
470 if (pass_message) setflag(addr, af_pass_message);
471 }
472 addr->transport_return = rc;
473 if (host)
474 addr->host_used = host;
447d236c 475 }
0756eb3c
PH
476}
477
478
479
480/*************************************************
481* Check an SMTP response *
482*************************************************/
483
484/* This function is given an errno code and the SMTP response buffer
485to analyse, together with the host identification for generating messages. It
486sets an appropriate message and puts the first digit of the response code into
487the yield variable. If no response was actually read, a suitable digit is
488chosen.
489
490Arguments:
447d236c
PH
491 host the current host, to get its name for messages
492 errno_value pointer to the errno value
493 more_errno from the top address for use with ERRNO_FILTER_FAIL
494 buffer the SMTP response buffer
495 yield where to put a one-digit SMTP response code
496 message where to put an errror message
497 pass_message set TRUE if message is an SMTP response
498
499Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
500*/
501
a7538db1
JH
502static BOOL
503check_response(host_item *host, int *errno_value, int more_errno,
447d236c 504 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH
505{
506uschar *pl = US"";
507
508if (smtp_use_pipelining &&
509 (Ustrcmp(smtp_command, "MAIL") == 0 ||
510 Ustrcmp(smtp_command, "RCPT") == 0 ||
511 Ustrcmp(smtp_command, "DATA") == 0))
512 pl = US"pipelined ";
513
514*yield = '4'; /* Default setting is to give a temporary error */
515
516/* Handle response timeout */
517
518if (*errno_value == ETIMEDOUT)
519 {
c562fd30
JH
520 *message = US string_sprintf("SMTP timeout after %s%s",
521 pl, smtp_command);
0756eb3c
PH
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
524 transport_count);
525 return FALSE;
526 }
527
528/* Handle malformed SMTP response */
529
530if (*errno_value == ERRNO_SMTPFORMAT)
531 {
55414b25 532 const uschar *malfresp = string_printing(buffer);
0756eb3c 533 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
0756eb3c
PH
539 return FALSE;
540 }
541
542/* Handle a failed filter process error; can't send QUIT as we mustn't
543end the DATA. */
544
545if (*errno_value == ERRNO_FILTER_FAIL)
546 {
35af9f61 547 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 548 more_errno,
35af9f61 549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
550 return FALSE;
551 }
552
553/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
554end the DATA. */
555
556if (*errno_value == ERRNO_CHHEADER_FAIL)
557 {
558 *message =
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
561 return FALSE;
562 }
563
564/* Handle failure to write a complete data block */
565
566if (*errno_value == ERRNO_WRITEINCOMPLETE)
567 {
568 *message = US string_sprintf("failed to write a data block");
569 return FALSE;
570 }
571
250b6871
JH
572#ifdef EXPERIMENTAL_INTERNATIONAL
573/* Handle lack of advertised SMTPUTF8, for international message */
574if (*errno_value == ERRNO_UTF8_FWD)
575 {
f358d5e0 576 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
579 }
580#endif
581
0756eb3c
PH
582/* Handle error responses from the remote mailer. */
583
584if (buffer[0] != 0)
585 {
55414b25 586 const uschar *s = string_printing(buffer);
447d236c 587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 588 "%s", pl, smtp_command, s);
447d236c 589 *pass_message = TRUE;
0756eb3c
PH
590 *yield = buffer[0];
591 return TRUE;
592 }
593
594/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
595connection closed) case, which causes deferral. An explicit connection reset
596error has the same effect. Otherwise, put the host's identity in the message,
597leaving the errno value to be interpreted as well. In all cases, we have to
598assume the connection is now dead. */
0756eb3c 599
19b9dc85 600if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
601 {
602 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
603 *message = US string_sprintf("Remote host closed connection "
604 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
605 }
606else *message = US string_sprintf("%s [%s]", host->name, host->address);
607
608return FALSE;
609}
610
611
612
613/*************************************************
614* Write error message to logs *
615*************************************************/
616
617/* This writes to the main log and to the message log.
618
619Arguments:
620 addr the address item containing error information
621 host the current host
622
623Returns: nothing
624*/
625
626static void
627write_logs(address_item *addr, host_item *host)
628{
c562fd30
JH
629uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
630
631if (addr->message)
0756eb3c 632 {
c562fd30 633 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
634 if (addr->basic_errno > 0)
635 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
636 log_write(0, LOG_MAIN, "%s", message);
637 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
638 }
639else
640 {
6c6d6e48 641 if (LOGGING(outgoing_port))
c562fd30
JH
642 message = string_sprintf("%s:%d", message,
643 host->port == PORT_NONE ? 25 : host->port);
644 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
645 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
646 strerror(addr->basic_errno));
0756eb3c
PH
647 }
648}
649
c562fd30
JH
650static void
651msglog_line(host_item * host, uschar * message)
652{
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
655}
656
0756eb3c
PH
657
658
774ef2d7 659#ifdef EXPERIMENTAL_EVENT
d68218c7
JH
660/*************************************************
661* Post-defer action *
662*************************************************/
663
664/* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667Arguments:
d68218c7
JH
668 addr the address item containing error information
669 host the current host
670
671Returns: nothing
672*/
673
674static void
774ef2d7 675deferred_event_raise(address_item *addr, host_item *host)
d68218c7 676{
774ef2d7 677uschar * action = addr->transport->event_action;
55414b25 678const uschar * save_domain;
a7538db1
JH
679uschar * save_local;
680
d68218c7 681if (!action)
a7538db1 682 return;
d68218c7 683
a7538db1
JH
684save_domain = deliver_domain;
685save_local = deliver_localpart;
686
687/*XXX would ip & port already be set up? */
688deliver_host_address = string_copy(host->address);
774ef2d7
JH
689deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690event_defer_errno = addr->basic_errno;
d68218c7
JH
691
692router_name = addr->router->name;
693transport_name = addr->transport->name;
a7538db1
JH
694deliver_domain = addr->domain;
695deliver_localpart = addr->local_part;
696
774ef2d7 697(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706deliver_localpart = save_local;
707deliver_domain = save_domain;
d68218c7
JH
708router_name = transport_name = NULL;
709}
710#endif
711
0756eb3c
PH
712/*************************************************
713* Synchronize SMTP responses *
714*************************************************/
715
716/* This function is called from smtp_deliver() to receive SMTP responses from
717the server, and match them up with the commands to which they relate. When
718PIPELINING is not in use, this function is called after every command, and is
719therefore somewhat over-engineered, but it is simpler to use a single scheme
720that works both with and without PIPELINING instead of having two separate sets
721of code.
722
723The set of commands that are buffered up with pipelining may start with MAIL
724and may end with DATA; in between are RCPT commands that correspond to the
725addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726etc.) are never buffered.
727
728Errors after MAIL or DATA abort the whole process leaving the response in the
729buffer. After MAIL, pending responses are flushed, and the original command is
730re-instated in big_buffer for error messages. For RCPT commands, the remote is
731permitted to reject some recipient addresses while accepting others. However
732certain errors clearly abort the whole process. Set the value in
733transport_return to PENDING_OK if the address is accepted. If there is a
734subsequent general error, it will get reset accordingly. If not, it will get
735converted to OK at the end.
736
737Arguments:
48c7f9e2
PH
738 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
743 address_retry_
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
0756eb3c
PH
753
754Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
761*/
762
763static int
764sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
768 int buffsize)
769{
770address_item *addr = *sync_addr;
771int yield = 0;
772
773/* Handle the response for a MAIL command. On error, reinstate the original
774command in big_buffer for error message use, and flush any further pending
775responses before returning, except after I/O errors and timeouts. */
776
777if (pending_MAIL)
778 {
779 count--;
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
781 {
782 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
783 if (errno == 0 && buffer[0] != 0)
784 {
785 uschar flushbuffer[4096];
e97957bc
PH
786 int save_errno = 0;
787 if (buffer[0] == '4')
788 {
789 save_errno = ERRNO_MAIL4XX;
790 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
791 }
0756eb3c
PH
792 while (count-- > 0)
793 {
794 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
795 '2', timeout)
796 && (errno != 0 || flushbuffer[0] == 0))
797 break;
798 }
e97957bc 799 errno = save_errno;
0756eb3c 800 }
c562fd30
JH
801
802 if (pending_DATA) count--; /* Number of RCPT responses to come */
803 while (count-- > 0) /* Mark any pending addrs with the host used */
804 {
805 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
806 addr->host_used = host;
807 addr = addr->next;
808 }
0756eb3c
PH
809 return -3;
810 }
811 }
812
813if (pending_DATA) count--; /* Number of RCPT responses to come */
814
815/* Read and handle the required number of RCPT responses, matching each one up
816with an address by scanning for the next address whose status is PENDING_DEFER.
817*/
818
819while (count-- > 0)
820 {
821 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
822
823 /* The address was accepted */
c562fd30 824 addr->host_used = host;
0756eb3c
PH
825
826 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
827 {
828 yield |= 1;
829 addr->transport_return = PENDING_OK;
830
831 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
832 ensure that any address-specific retry record is expunged. We do this both
833 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
834
835 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
836 {
837 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
838 sender_address);
839 retry_add_item(addr, altkey, rf_delete);
0756eb3c 840 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 841 }
0756eb3c
PH
842 }
843
844 /* Timeout while reading the response */
845
846 else if (errno == ETIMEDOUT)
847 {
c562fd30
JH
848 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
849 transport_rcpt_address(addr, include_affixes));
168dec3b 850 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
0756eb3c 851 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 852 update_waiting = FALSE;
0756eb3c
PH
853 return -1;
854 }
855
856 /* Handle other errors in obtaining an SMTP response by returning -1. This
857 will cause all the addresses to be deferred. Restore the SMTP command in
858 big_buffer for which we are checking the response, so the error message
859 makes sense. */
860
861 else if (errno != 0 || buffer[0] == 0)
862 {
863 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
864 transport_rcpt_address(addr, include_affixes));
865 return -2;
866 }
867
868 /* Handle SMTP permanent and temporary response codes. */
869
870 else
871 {
872 addr->message =
447d236c 873 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
874 "%s", transport_rcpt_address(addr, include_affixes),
875 string_printing(buffer));
447d236c 876 setflag(addr, af_pass_message);
c562fd30 877 msglog_line(host, addr->message);
0756eb3c
PH
878
879 /* The response was 5xx */
880
881 if (buffer[0] == '5')
882 {
883 addr->transport_return = FAIL;
884 yield |= 2;
885 }
886
887 /* The response was 4xx */
888
889 else
890 {
0756eb3c
PH
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 893 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 894
c562fd30
JH
895 /* Log temporary errors if there are more hosts to be tried.
896 If not, log this last one in the == line. */
0756eb3c 897
c562fd30
JH
898 if (host->next)
899 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 900
f6c332bd
PH
901 /* Do not put this message on the list of those waiting for specific
902 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 903
f6c332bd 904 update_waiting = FALSE;
0756eb3c 905
48c7f9e2
PH
906 /* Add a retry item for the address so that it doesn't get tried again
907 too soon. If address_retry_include_sender is true, add the sender address
908 to the retry key. */
0756eb3c 909
48c7f9e2
PH
910 if (address_retry_include_sender)
911 {
912 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
913 sender_address);
914 retry_add_item(addr, altkey, 0);
915 }
916 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
917 }
918 }
919 } /* Loop for next RCPT response */
920
921/* Update where to start at for the next block of responses, unless we
922have already handled all the addresses. */
923
924if (addr != NULL) *sync_addr = addr->next;
925
926/* Handle a response to DATA. If we have not had any good recipients, either
927previously or in this block, the response is ignored. */
928
929if (pending_DATA != 0 &&
930 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
931 {
932 int code;
933 uschar *msg;
447d236c 934 BOOL pass_message;
e97957bc
PH
935 if (pending_DATA > 0 || (yield & 1) != 0)
936 {
937 if (errno == 0 && buffer[0] == '4')
938 {
939 errno = ERRNO_DATA4XX;
940 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
941 }
942 return -3;
943 }
447d236c 944 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
945 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
946 "is in use and there were no good recipients\n", msg);
947 }
948
949/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
950present) received 3xx. If any RCPTs were handled and yielded anything other
951than 4xx, yield will be set non-zero. */
952
953return yield;
954}
955
956
957
fcc8e047
JH
958/* Do the client side of smtp-level authentication */
959/*
960Arguments:
961 buffer EHLO response from server (gets overwritten)
962 addrlist chain of potential addresses to deliver
963 host host to deliver to
964 ob transport options
965 ibp, obp comms channel control blocks
966
967Returns:
968 OK Success, or failed (but not required): global "smtp_authenticated" set
969 DEFER Failed authentication (and was required)
970 ERROR Internal problem
971
972 FAIL_SEND Failed communications - transmit
973 FAIL - response
974*/
975
976int
977smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
978 smtp_transport_options_block *ob, BOOL is_esmtp,
979 smtp_inblock *ibp, smtp_outblock *obp)
980{
a7538db1
JH
981int require_auth;
982uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 983
a7538db1
JH
984smtp_authenticated = FALSE;
985client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 986require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 987
a7538db1
JH
988if (is_esmtp && !regex_AUTH) regex_AUTH =
989 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
990 FALSE, TRUE);
fcc8e047 991
a7538db1
JH
992if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
993 {
994 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
995 expand_nmax = -1; /* reset */
fcc8e047 996
a7538db1
JH
997 /* Must not do this check until after we have saved the result of the
998 regex match above. */
fcc8e047 999
a7538db1 1000 if (require_auth == OK ||
5130845b 1001 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1002 {
1003 auth_instance *au;
1004 fail_reason = US"no common mechanisms were found";
fcc8e047 1005
a7538db1 1006 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1007
a7538db1
JH
1008 /* Scan the configured authenticators looking for one which is configured
1009 for use as a client, which is not suppressed by client_condition, and
1010 whose name matches an authentication mechanism supported by the server.
1011 If one is found, attempt to authenticate by calling its client function.
1012 */
fcc8e047 1013
a7538db1
JH
1014 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1015 {
1016 uschar *p = names;
1017 if (!au->client ||
1018 (au->client_condition != NULL &&
1019 !expand_check_condition(au->client_condition, au->name,
1020 US"client authenticator")))
1021 {
1022 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1023 au->name,
1024 (au->client)? "client_condition is false" :
1025 "not configured as a client");
1026 continue;
1027 }
fcc8e047 1028
a7538db1 1029 /* Loop to scan supported server mechanisms */
fcc8e047 1030
a7538db1
JH
1031 while (*p != 0)
1032 {
1033 int rc;
1034 int len = Ustrlen(au->public_name);
1035 while (isspace(*p)) p++;
fcc8e047 1036
a7538db1
JH
1037 if (strncmpic(au->public_name, p, len) != 0 ||
1038 (p[len] != 0 && !isspace(p[len])))
1039 {
1040 while (*p != 0 && !isspace(*p)) p++;
1041 continue;
1042 }
fcc8e047 1043
a7538db1
JH
1044 /* Found data for a listed mechanism. Call its client entry. Set
1045 a flag in the outblock so that data is overwritten after sending so
1046 that reflections don't show it. */
fcc8e047 1047
a7538db1
JH
1048 fail_reason = US"authentication attempt(s) failed";
1049 obp->authenticating = TRUE;
1050 rc = (au->info->clientcode)(au, ibp, obp,
1051 ob->command_timeout, buffer, bufsize);
1052 obp->authenticating = FALSE;
1053 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1054 au->name, rc);
fcc8e047 1055
a7538db1
JH
1056 /* A temporary authentication failure must hold up delivery to
1057 this host. After a permanent authentication failure, we carry on
1058 to try other authentication methods. If all fail hard, try to
1059 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1060
a7538db1
JH
1061 switch(rc)
1062 {
1063 case OK:
1064 smtp_authenticated = TRUE; /* stops the outer loop */
1065 client_authenticator = au->name;
1066 if (au->set_client_id != NULL)
1067 client_authenticated_id = expand_string(au->set_client_id);
1068 break;
1069
1070 /* Failure after writing a command */
1071
1072 case FAIL_SEND:
1073 return FAIL_SEND;
1074
1075 /* Failure after reading a response */
1076
1077 case FAIL:
1078 if (errno != 0 || buffer[0] != '5') return FAIL;
1079 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1080 au->name, host->name, host->address, buffer);
1081 break;
1082
1083 /* Failure by some other means. In effect, the authenticator
1084 decided it wasn't prepared to handle this case. Typically this
1085 is the result of "fail" in an expansion string. Do we need to
1086 log anything here? Feb 2006: a message is now put in the buffer
1087 if logging is required. */
1088
1089 case CANCELLED:
1090 if (*buffer != 0)
1091 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1092 "authentication H=%s [%s] %s", au->name, host->name,
1093 host->address, buffer);
1094 break;
1095
1096 /* Internal problem, message in buffer. */
1097
1098 case ERROR:
168dec3b
JH
1099 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1100 DEFER, FALSE, NULL);
a7538db1
JH
1101 return ERROR;
1102 }
fcc8e047 1103
a7538db1
JH
1104 break; /* If not authenticated, try next authenticator */
1105 } /* Loop for scanning supported server mechanisms */
1106 } /* Loop for further authenticators */
fcc8e047 1107 }
a7538db1 1108 }
fcc8e047 1109
a7538db1 1110/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1111
a7538db1
JH
1112if (require_auth == OK && !smtp_authenticated)
1113 {
1114 set_errno(addrlist, ERRNO_AUTHFAIL,
1115 string_sprintf("authentication required but %s", fail_reason), DEFER,
c562fd30 1116 FALSE, NULL);
a7538db1
JH
1117 return DEFER;
1118 }
4d8d62b9 1119
a7538db1 1120return OK;
fcc8e047
JH
1121}
1122
1123
1124/* Construct AUTH appendix string for MAIL TO */
1125/*
1126Arguments
1127 buffer to build string
1128 addrlist chain of potential addresses to deliver
1129 ob transport options
1130
1131Globals smtp_authenticated
1132 client_authenticated_sender
1133Return True on error, otherwise buffer has (possibly empty) terminated string
1134*/
1135
1136BOOL
1137smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1138 smtp_transport_options_block *ob)
1139{
1140uschar *local_authenticated_sender = authenticated_sender;
1141
1142#ifdef notdef
1143 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1144#endif
1145
1146if (ob->authenticated_sender != NULL)
1147 {
1148 uschar *new = expand_string(ob->authenticated_sender);
1149 if (new == NULL)
1150 {
1151 if (!expand_string_forcedfail)
1152 {
1153 uschar *message = string_sprintf("failed to expand "
1154 "authenticated_sender: %s", expand_string_message);
168dec3b 1155 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
fcc8e047
JH
1156 return TRUE;
1157 }
1158 }
1159 else if (new[0] != 0) local_authenticated_sender = new;
1160 }
1161
1162/* Add the authenticated sender address if present */
1163
1164if ((smtp_authenticated || ob->authenticated_sender_force) &&
1165 local_authenticated_sender != NULL)
1166 {
1167 string_format(buffer, bufsize, " AUTH=%s",
1168 auth_xtextencode(local_authenticated_sender,
1169 Ustrlen(local_authenticated_sender)));
1170 client_authenticated_sender = string_copy(local_authenticated_sender);
1171 }
1172else
1173 *buffer= 0;
1174
1175return FALSE;
1176}
1177
1178
1179
0e66b3b6
JH
1180#ifdef EXPERIMENTAL_DANE
1181int
b8b1b5cb 1182tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH
1183 BOOL dane_required, BOOL * dane)
1184{
1185/* move this out to host.c given the similarity to dns_lookup() ? */
1186uschar buffer[300];
55414b25 1187const uschar * fullname = buffer;
0e66b3b6
JH
1188
1189/* TLSA lookup string */
1190(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1191
1192switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1193 {
1194 case DNS_AGAIN:
1195 return DEFER; /* just defer this TLS'd conn */
1196
1197 default:
1198 case DNS_FAIL:
1199 if (dane_required)
0e66b3b6 1200 return FAIL;
0e66b3b6
JH
1201 break;
1202
1203 case DNS_SUCCEED:
1204 if (!dns_is_secure(dnsa))
1205 {
1206 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1207 return DEFER;
1208 }
1209 *dane = TRUE;
1210 break;
1211 }
1212return OK;
1213}
1214#endif
1215
1216
a39bd74d
JB
1217
1218typedef struct smtp_compare_s
1219{
1220 uschar *current_sender_address;
1221 struct transport_instance *tblock;
1222} smtp_compare_t;
1223
1224/*
1225Create a unique string that identifies this message, it is based on
1226sender_address, helo_data and tls_certificate if enabled. */
1227
1228static uschar *
1229smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1230{
1231address_item * addr1;
1232uschar * if1 = US"";
1233uschar * helo1 = US"";
1234#ifdef SUPPORT_TLS
1235uschar * tlsc1 = US"";
1236#endif
1237uschar * save_sender_address = sender_address;
1238uschar * local_identity = NULL;
1239smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1241
1242sender_address = sender;
1243
1244addr1 = deliver_make_addr (sender, TRUE);
1245deliver_set_expansions(addr1);
1246
1247if (ob->interface)
1248 if1 = expand_string(ob->interface);
1249
1250if (ob->helo_data)
1251 helo1 = expand_string(ob->helo_data);
1252
1253#ifdef SUPPORT_TLS
1254if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1257#else
1258local_identity = string_sprintf ("%s^%s", if1, helo1);
1259#endif
1260
1261deliver_set_expansions(NULL);
1262sender_address = save_sender_address;
1263
1264return local_identity;
1265}
1266
1267
1268
1269/* This routine is a callback that is called from transport_check_waiting.
1270This function will evaluate the incoming message versus the previous
1271message. If the incoming message is using a different local identity then
1272we will veto this new message. */
1273
1274static BOOL
1275smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1276{
dadff1d4
HSHR
1277
1278uschar * message_local_identity,
1279 * current_local_identity,
1280 * new_sender_address;
1281
1282current_local_identity =
a39bd74d 1283 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1284
dadff1d4
HSHR
1285if (!(new_sender_address = deliver_get_sender_address(message_id)))
1286 return 0;
1287
1288message_local_identity =
1289 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1290
1291return Ustrcmp(current_local_identity, message_local_identity) == 0;
1292}
1293
1294
1295
0756eb3c
PH
1296/*************************************************
1297* Deliver address list to given host *
1298*************************************************/
1299
1300/* If continue_hostname is not null, we get here only when continuing to
1301deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1302input. TLS is never active on a passed channel; the previous process always
1303closes it down before passing the connection on.
0756eb3c
PH
1304
1305Otherwise, we have to make a connection to the remote host, and do the
1306initial protocol exchange.
1307
1308When running as an MUA wrapper, if the sender or any recipient is rejected,
1309temporarily or permanently, we force failure for all recipients.
1310
1311Arguments:
1312 addrlist chain of potential addresses to deliver; only those whose
1313 transport_return field is set to PENDING_DEFER are currently
1314 being processed; others should be skipped - they have either
1315 been delivered to an earlier host or IP address, or been
1316 failed by one of them.
1317 host host to deliver to
1318 host_af AF_INET or AF_INET6
2d280592 1319 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1320 interface interface to bind to, or NULL
1321 tblock transport instance block
0756eb3c
PH
1322 message_defer set TRUE if yield is OK, but all addresses were deferred
1323 because of a non-recipient, non-host failure, that is, a
1324 4xx response to MAIL FROM, DATA, or ".". This is a defer
1325 that is specific to the message.
1326 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1327 a second attempt after TLS initialization fails
1328
1329Returns: OK - the connection was made and the delivery attempted;
1330 the result for each address is in its data block.
1331 DEFER - the connection could not be made, or something failed
1332 while setting up the SMTP session, or there was a
1333 non-message-specific error, such as a timeout.
1334 ERROR - a filter command is specified for this transport,
1335 and there was a problem setting it up; OR helo_data
1336 or add_headers or authenticated_sender is specified
1337 for this transport, and the string failed to expand
1338*/
1339
1340static int
1341smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1342 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1343 BOOL *message_defer, BOOL suppress_tls)
1344{
1345address_item *addr;
1346address_item *sync_addr;
1347address_item *first_addr = addrlist;
1348int yield = OK;
1349int address_count;
1350int save_errno;
1351int rc;
1352time_t start_delivery_time = time(NULL);
1353smtp_transport_options_block *ob =
1354 (smtp_transport_options_block *)(tblock->options_block);
1355BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1356BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1357BOOL ok = FALSE;
1358BOOL send_rset = TRUE;
1359BOOL send_quit = TRUE;
1360BOOL setting_up = TRUE;
1361BOOL completed_address = FALSE;
1362BOOL esmtp = TRUE;
1363BOOL pending_MAIL;
447d236c 1364BOOL pass_message = FALSE;
8ccd00b1 1365#ifndef DISABLE_PRDR
fd98a5c6
JH
1366BOOL prdr_offered = FALSE;
1367BOOL prdr_active;
1368#endif
7ade712c 1369#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1370BOOL utf8_needed = FALSE;
7ade712c
JH
1371BOOL utf8_offered = FALSE;
1372#endif
6c1c3d1d 1373BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1374#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1375BOOL dane = FALSE;
0539a19d 1376BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1377dns_answer tlsa_dnsa;
1378#endif
0756eb3c
PH
1379smtp_inblock inblock;
1380smtp_outblock outblock;
1381int max_rcpt = tblock->max_addresses;
f1513293 1382uschar *igquotstr = US"";
a39bd74d 1383
41c7c167 1384uschar *helo_data = NULL;
a39bd74d 1385
0756eb3c
PH
1386uschar *message = NULL;
1387uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1388uschar *p;
1389uschar buffer[4096];
1390uschar inbuffer[4096];
98470202 1391uschar outbuffer[4096];
0756eb3c
PH
1392
1393suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1394
1395*message_defer = FALSE;
1396smtp_command = US"initial connection";
1397if (max_rcpt == 0) max_rcpt = 999999;
1398
1399/* Set up the buffer for reading SMTP response packets. */
1400
1401inblock.buffer = inbuffer;
1402inblock.buffersize = sizeof(inbuffer);
1403inblock.ptr = inbuffer;
1404inblock.ptrend = inbuffer;
1405
1406/* Set up the buffer for holding SMTP commands while pipelining */
1407
1408outblock.buffer = outbuffer;
1409outblock.buffersize = sizeof(outbuffer);
1410outblock.ptr = outbuffer;
1411outblock.cmd_count = 0;
1412outblock.authenticating = FALSE;
1413
6c512171
PH
1414/* Reset the parameters of a TLS session. */
1415
817d9f57
JH
1416tls_out.bits = 0;
1417tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1418tls_out.ourcert = NULL;
1419tls_out.peercert = NULL;
817d9f57
JH
1420tls_out.peerdn = NULL;
1421#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1422tls_out.sni = NULL;
5b456975 1423#endif
018058b2 1424tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1425
35aba663
JH
1426/* Flip the legacy TLS-related variables over to the outbound set in case
1427they're used in the context of the transport. Don't bother resetting
1428afterward as we're in a subprocess. */
1429
1430tls_modify_variables(&tls_out);
1431
061b7ebd
PP
1432#ifndef SUPPORT_TLS
1433if (smtps)
1434 {
168dec3b
JH
1435 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1436 DEFER, FALSE, NULL);
018058b2 1437 return ERROR;
061b7ebd
PP
1438 }
1439#endif
1440
0756eb3c
PH
1441/* Make a connection to the host if this isn't a continued delivery, and handle
1442the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1443specially so they can be identified for retries. */
1444
1445if (continue_hostname == NULL)
1446 {
a7538db1 1447 /* This puts port into host->port */
0756eb3c 1448 inblock.sock = outblock.sock =
7eb6c37c 1449 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1450
0756eb3c
PH
1451 if (inblock.sock < 0)
1452 {
1453 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
c562fd30 1454 NULL, DEFER, FALSE, NULL);
0756eb3c
PH
1455 return DEFER;
1456 }
1457
0e66b3b6
JH
1458#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1459 {
0e66b3b6
JH
1460 tls_out.dane_verified = FALSE;
1461 tls_out.tlsa_usage = 0;
1462
0e66b3b6
JH
1463 if (host->dnssec == DS_YES)
1464 {
bf7aabb4
JH
1465 if( ( dane_required
1466 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1467 )
1468 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
038597d2 1469 && dane_required /* do not error on only dane-requested */
0e66b3b6 1470 )
4cea764f
JH
1471 {
1472 set_errno(addrlist, ERRNO_DNSDEFER,
1473 string_sprintf("DANE error: tlsa lookup %s",
1474 rc == DEFER ? "DEFER" : "FAIL"),
1475 rc, FALSE, NULL);
038597d2 1476 return rc;
4cea764f 1477 }
0e66b3b6
JH
1478 }
1479 else if (dane_required)
1480 {
4cea764f
JH
1481 set_errno(addrlist, ERRNO_DNSDEFER,
1482 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1483 FAIL, FALSE, NULL);
1484 return FAIL;
0e66b3b6
JH
1485 }
1486
1487 if (dane)
1488 ob->tls_tempfail_tryclear = FALSE;
1489 }
1490#endif /*DANE*/
1491
41c7c167
PH
1492 /* Expand the greeting message while waiting for the initial response. (Makes
1493 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1494 delayed till here so that $sending_interface and $sending_port are set. */
1495
1496 helo_data = expand_string(ob->helo_data);
810d16ad
JH
1497#ifdef EXPERIMENTAL_INTERNATIONAL
1498 if (helo_data)
1499 {
1500 uschar * errstr = NULL;
1501 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1502 {
1503 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1504 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1505 yield = DEFER;
1506 goto SEND_QUIT;
1507 }
1508 }
1509#endif
41c7c167 1510
0756eb3c
PH
1511 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1512 is nevertheless a reasonably clean way of programming this kind of logic,
1513 where you want to escape on any error. */
1514
061b7ebd
PP
1515 if (!smtps)
1516 {
1517 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1518 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1519
774ef2d7 1520#ifdef EXPERIMENTAL_EVENT
b30275b8 1521 {
805c9d53
JH
1522 uschar * s;
1523 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1524 : host->dnssec==DS_NO ? US"no" : NULL;
1525 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1526 if (s)
a7538db1 1527 {
168dec3b 1528 set_errno(addrlist, ERRNO_EXPANDFAIL,
b30275b8
JH
1529 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1530 DEFER, FALSE, NULL);
a7538db1
JH
1531 yield = DEFER;
1532 goto SEND_QUIT;
1533 }
b30275b8 1534 }
a7538db1
JH
1535#endif
1536
061b7ebd
PP
1537 /* Now check if the helo_data expansion went well, and sign off cleanly if
1538 it didn't. */
41c7c167 1539
061b7ebd
PP
1540 if (helo_data == NULL)
1541 {
1542 uschar *message = string_sprintf("failed to expand helo_data: %s",
1543 expand_string_message);
168dec3b 1544 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
061b7ebd
PP
1545 yield = DEFER;
1546 goto SEND_QUIT;
1547 }
41c7c167
PH
1548 }
1549
0756eb3c
PH
1550/** Debugging without sending a message
1551addrlist->transport_return = DEFER;
1552goto SEND_QUIT;
1553**/
1554
1555 /* Errors that occur after this point follow an SMTP command, which is
1556 left in big_buffer by smtp_write_command() for use in error messages. */
1557
1558 smtp_command = big_buffer;
1559
1560 /* Tell the remote who we are...
1561
1562 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1563 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1564 greeting is of this form. The assumption was that the far end supports it
1565 properly... but experience shows that there are some that give 5xx responses,
1566 even though the banner includes "ESMTP" (there's a bloody-minded one that
1567 says "ESMTP not spoken here"). Cope with that case.
1568
1569 September 2000: Time has passed, and it seems reasonable now to always send
1570 EHLO at the start. It is also convenient to make the change while installing
1571 the TLS stuff.
1572
1573 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1574 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1575 would be no way to send out the mails, so there is now a host list
1576 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1577 PIPELINING problem as well. Maybe it can also be useful to cure other
1578 problems with broken servers.
1579
1580 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1581 Then somebody tried it with a Microsoft mailer... It seems that all other
1582 mailers use upper case for some reason (the RFC is quite clear about case
1583 independence) so, for peace of mind, I gave in. */
1584
5130845b 1585 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1586
061b7ebd
PP
1587 /* Alas; be careful, since this goto is not an error-out, so conceivably
1588 we might set data between here and the target which we assume to exist
1589 and be usable. I can see this coming back to bite us. */
a7538db1 1590#ifdef SUPPORT_TLS
061b7ebd
PP
1591 if (smtps)
1592 {
1593 tls_offered = TRUE;
1594 suppress_tls = FALSE;
1595 ob->tls_tempfail_tryclear = FALSE;
1596 smtp_command = US"SSL-on-connect";
1597 goto TLS_NEGOTIATE;
1598 }
a7538db1 1599#endif
061b7ebd 1600
0756eb3c
PH
1601 if (esmtp)
1602 {
1603 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1604 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1605 goto SEND_FAILED;
1606 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1607 ob->command_timeout))
1608 {
1609 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1610 esmtp = FALSE;
1611 }
1612 }
1613 else
1614 {
1615 DEBUG(D_transport)
1616 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1617 }
1618
1619 if (!esmtp)
1620 {
1621 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1622 goto SEND_FAILED;
1623 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1624 ob->command_timeout)) goto RESPONSE_FAILED;
1625 }
1626
f1513293
PH
1627 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1628 lmtp_ignore_quota option was set. */
1629
1630 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1631 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1632 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1633
0756eb3c
PH
1634 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1635
a7538db1 1636#ifdef SUPPORT_TLS
0756eb3c
PH
1637 tls_offered = esmtp &&
1638 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1639 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1640#endif
fd98a5c6 1641
a7538db1 1642#ifndef DISABLE_PRDR
5130845b
JH
1643 prdr_offered = esmtp
1644 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1645 PCRE_EOPT, NULL, 0) >= 0
1646 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1647
1648 if (prdr_offered)
1649 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1650#endif
7ade712c
JH
1651
1652#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH
1653 if (addrlist->prop.utf8_msg)
1654 {
1655 utf8_needed = !addrlist->prop.utf8_downcvt
1656 && !addrlist->prop.utf8_downcvt_maybe;
1657 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1658 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1659
1660 utf8_offered = esmtp
1661 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1662 PCRE_EOPT, NULL, 0) >= 0;
1663 }
7ade712c 1664#endif
0756eb3c
PH
1665 }
1666
1667/* For continuing deliveries down the same channel, the socket is the standard
1668input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1669below). Set up the pointer to where subsequent commands will be left, for
1670error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1671set from the command line if they were set in the process that passed the
1672connection on. */
1673
1674else
1675 {
1676 inblock.sock = outblock.sock = fileno(stdin);
1677 smtp_command = big_buffer;
4311097e 1678 host->port = port; /* Record the port that was used */
0756eb3c
PH
1679 }
1680
1681/* If TLS is available on this connection, whether continued or not, attempt to
1682start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1683send another EHLO - the server may give a different answer in secure mode. We
1684use a separate buffer for reading the response to STARTTLS so that if it is
1685negative, the original EHLO data is available for subsequent analysis, should
1686the client not be required to use TLS. If the response is bad, copy the buffer
1687for error analysis. */
1688
1689#ifdef SUPPORT_TLS
5130845b
JH
1690if ( tls_offered
1691 && !suppress_tls
1692 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1693 {
1694 uschar buffer2[4096];
1695 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1696 goto SEND_FAILED;
1697
1698 /* If there is an I/O error, transmission of this message is deferred. If
1699 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1700 false, we also defer. However, if there is a temporary rejection of STARTTLS
1701 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1702 STARTTLS, we carry on. This means we will try to send the message in clear,
1703 unless the host is in hosts_require_tls (tested below). */
1704
1705 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1706 ob->command_timeout))
1707 {
0756eb3c
PH
1708 if (errno != 0 || buffer2[0] == 0 ||
1709 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1710 {
1711 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1712 goto RESPONSE_FAILED;
0dda4340 1713 }
0756eb3c
PH
1714 }
1715
1716 /* STARTTLS accepted: try to negotiate a TLS session. */
1717
1718 else
061b7ebd 1719 TLS_NEGOTIATE:
0756eb3c 1720 {
0e66b3b6
JH
1721 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1722# ifdef EXPERIMENTAL_DANE
1723 , dane ? &tlsa_dnsa : NULL
1724# endif
1725 );
0756eb3c
PH
1726
1727 /* TLS negotiation failed; give an error. From outside, this function may
1728 be called again to try in clear on a new connection, if the options permit
1729 it for this host. */
1730
1731 if (rc != OK)
1732 {
6ebd79ec
JH
1733# ifdef EXPERIMENTAL_DANE
1734 if (rc == DEFER && dane && !dane_required)
1735 {
1736 log_write(0, LOG_MAIN, "DANE attempt failed;"
1737 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1738 host->name, host->address);
1739 dane = FALSE;
1740 goto TLS_NEGOTIATE;
1741 }
1742# endif
1743
0756eb3c
PH
1744 save_errno = ERRNO_TLSFAILURE;
1745 message = US"failure while setting up TLS session";
1746 send_quit = FALSE;
1747 goto TLS_FAILED;
1748 }
1749
1750 /* TLS session is set up */
1751
1752 for (addr = addrlist; addr != NULL; addr = addr->next)
5ca2a9a1
PH
1753 if (addr->transport_return == PENDING_DEFER)
1754 {
817d9f57 1755 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1756 addr->ourcert = tls_out.ourcert;
1757 addr->peercert = tls_out.peercert;
817d9f57 1758 addr->peerdn = tls_out.peerdn;
018058b2 1759 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1760 }
0756eb3c
PH
1761 }
1762 }
1763
061b7ebd
PP
1764/* if smtps, we'll have smtp_command set to something else; always safe to
1765reset it here. */
1766smtp_command = big_buffer;
1767
41c7c167
PH
1768/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1769helo_data is null, we are dealing with a connection that was passed from
1770another process, and so we won't have expanded helo_data above. We have to
1771expand it here. $sending_ip_address and $sending_port are set up right at the
1772start of the Exim process (in exim.c). */
0756eb3c 1773
817d9f57 1774if (tls_out.active >= 0)
0756eb3c 1775 {
061b7ebd 1776 char *greeting_cmd;
41c7c167
PH
1777 if (helo_data == NULL)
1778 {
1779 helo_data = expand_string(ob->helo_data);
1780 if (helo_data == NULL)
1781 {
1782 uschar *message = string_sprintf("failed to expand helo_data: %s",
1783 expand_string_message);
168dec3b 1784 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
41c7c167
PH
1785 yield = DEFER;
1786 goto SEND_QUIT;
1787 }
1788 }
1789
0d0e4455 1790 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1791 if (smtps)
1792 {
1793 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1794 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1795 }
1796
1797 if (esmtp)
1798 greeting_cmd = "EHLO";
1799 else
1800 {
1801 greeting_cmd = "HELO";
1802 DEBUG(D_transport)
1803 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1804 }
1805
1806 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1807 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1808 goto SEND_FAILED;
1809 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1810 ob->command_timeout))
1811 goto RESPONSE_FAILED;
1812 }
1813
1814/* If the host is required to use a secure channel, ensure that we
1815have one. */
1816
0e66b3b6
JH
1817else if (
1818# ifdef EXPERIMENTAL_DANE
1819 dane ||
1820# endif
5130845b 1821 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1822 )
0756eb3c
PH
1823 {
1824 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1825 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH
1826 tls_offered? "an attempt to start TLS failed" :
1827 "the server did not offer TLS support");
1828 goto TLS_FAILED;
1829 }
0e66b3b6 1830#endif /*SUPPORT_TLS*/
0756eb3c
PH
1831
1832/* If TLS is active, we have just started it up and re-done the EHLO command,
1833so its response needs to be analyzed. If TLS is not active and this is a
1834continued session down a previously-used socket, we haven't just done EHLO, so
1835we skip this. */
1836
1837if (continue_hostname == NULL
a7538db1 1838#ifdef SUPPORT_TLS
817d9f57 1839 || tls_out.active >= 0
a7538db1 1840#endif
0756eb3c
PH
1841 )
1842 {
f1513293
PH
1843 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1844 lmtp_ignore_quota option was set. */
1845
1846 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1847 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1848 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1849
0756eb3c
PH
1850 /* If the response to EHLO specified support for the SIZE parameter, note
1851 this, provided size_addition is non-negative. */
1852
1853 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1854 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1855 PCRE_EOPT, NULL, 0) >= 0;
1856
1857 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1858 the current host, esmtp will be false, so PIPELINING can never be used. If
1859 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1860
5130845b
JH
1861 smtp_use_pipelining = esmtp
1862 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1863 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1864 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH
1865
1866 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1867 smtp_use_pipelining? "" : "not ");
1868
8ccd00b1 1869#ifndef DISABLE_PRDR
5130845b
JH
1870 prdr_offered = esmtp
1871 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
7ade712c 1872 PCRE_EOPT, NULL, 0) >= 0
5130845b 1873 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1874
1875 if (prdr_offered)
1876 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1877#endif
1878
7ade712c 1879#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH
1880 if (addrlist->prop.utf8_msg)
1881 utf8_offered = esmtp
1882 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1883 PCRE_EOPT, NULL, 0) >= 0;
7ade712c
JH
1884#endif
1885
6c1c3d1d 1886 /* Note if the server supports DSN */
7ade712c
JH
1887 smtp_use_dsn = esmtp
1888 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1889 PCRE_EOPT, NULL, 0) >= 0;
6c1c3d1d 1890 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1891
0756eb3c
PH
1892 /* Note if the response to EHLO specifies support for the AUTH extension.
1893 If it has, check that this host is one we want to authenticate to, and do
1894 the business. The host name and address must be available when the
1895 authenticator's client driver is running. */
1896
fcc8e047
JH
1897 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1898 ob, esmtp, &inblock, &outblock))
0756eb3c 1899 {
fcc8e047
JH
1900 default: goto SEND_QUIT;
1901 case OK: break;
1902 case FAIL_SEND: goto SEND_FAILED;
1903 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1904 }
1905 }
1906
1907/* The setting up of the SMTP call is now complete. Any subsequent errors are
1908message-specific. */
1909
1910setting_up = FALSE;
1911
7ade712c
JH
1912#ifdef EXPERIMENTAL_INTERNATIONAL
1913/* If this is an international message we need the host to speak SMTPUTF8 */
3c8b3577 1914if (utf8_needed && !utf8_offered)
7ade712c
JH
1915 {
1916 errno = ERRNO_UTF8_FWD;
1917 goto RESPONSE_FAILED;
1918 }
1919#endif
1920
0756eb3c
PH
1921/* If there is a filter command specified for this transport, we can now
1922set it up. This cannot be done until the identify of the host is known. */
1923
1924if (tblock->filter_command != NULL)
1925 {
1926 BOOL rc;
1927 uschar buffer[64];
1928 sprintf(CS buffer, "%.50s transport", tblock->name);
1929 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1930 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1931 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1932
1933 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1934 yield ERROR. */
1935
1936 if (!rc)
1937 {
447d236c 1938 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
c562fd30 1939 FALSE, NULL);
0756eb3c
PH
1940 yield = ERROR;
1941 goto SEND_QUIT;
1942 }
1943 }
1944
1945
1946/* For messages that have more than the maximum number of envelope recipients,
1947we want to send several transactions down the same SMTP connection. (See
1948comments in deliver.c as to how this reconciles, heuristically, with
1949remote_max_parallel.) This optimization was added to Exim after the following
1950code was already working. The simplest way to put it in without disturbing the
1951code was to use a goto to jump back to this point when there is another
1952transaction to handle. */
1953
1954SEND_MESSAGE:
1955sync_addr = first_addr;
1956address_count = 0;
1957ok = FALSE;
1958send_rset = TRUE;
1959completed_address = FALSE;
1960
1961
1962/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1963qualification, send it, adding something to the message size to allow for
1964imprecision and things that get added en route. Exim keeps the number of lines
1965in a message, so we can give an accurate value for the original message, but we
1966need some additional to handle added headers. (Double "." characters don't get
1967included in the count.) */
1968
1969p = buffer;
1970*p = 0;
1971
1972if (smtp_use_size)
1973 {
1974 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1975 while (*p) p++;
1976 }
1977
8ccd00b1 1978#ifndef DISABLE_PRDR
fd98a5c6
JH
1979prdr_active = FALSE;
1980if (prdr_offered)
1981 {
1982 for (addr = first_addr; addr; addr = addr->next)
1983 if (addr->transport_return == PENDING_DEFER)
1984 {
1985 for (addr = addr->next; addr; addr = addr->next)
1986 if (addr->transport_return == PENDING_DEFER)
1987 { /* at least two recipients to send */
1988 prdr_active = TRUE;
1989 sprintf(CS p, " PRDR"); p += 5;
a7538db1 1990 break;
fd98a5c6
JH
1991 }
1992 break;
1993 }
1994 }
fd98a5c6
JH
1995#endif
1996
7ade712c 1997#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1998if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
7ade712c
JH
1999 sprintf(CS p, " SMTPUTF8"), p += 9;
2000#endif
2001
6c1c3d1d
WB
2002/* check if all addresses have lasthop flag */
2003/* do not send RET and ENVID if true */
7ade712c 2004for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB
2005 address_count < max_rcpt && addr != NULL;
2006 addr = addr->next)
2007 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2008 {
6c1c3d1d 2009 dsn_all_lasthop = FALSE;
7ade712c
JH
2010 break;
2011 }
6c1c3d1d
WB
2012
2013/* Add any DSN flags to the mail command */
2014
7ade712c 2015if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB
2016 {
2017 if (dsn_ret == dsn_ret_hdrs)
2018 {
45500060 2019 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB
2020 while (*p) p++;
2021 }
2022 else if (dsn_ret == dsn_ret_full)
2023 {
45500060 2024 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB
2025 while (*p) p++;
2026 }
2027 if (dsn_envid != NULL)
2028 {
2029 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2030 while (*p) p++;
2031 }
2032 }
6c1c3d1d 2033
6b62e899
JH
2034/* If an authenticated_sender override has been specified for this transport
2035instance, expand it. If the expansion is forced to fail, and there was already
2036an authenticated_sender for this message, the original value will be used.
2037Other expansion failures are serious. An empty result is ignored, but there is
2038otherwise no check - this feature is expected to be used with LMTP and other
2039cases where non-standard addresses (e.g. without domains) might be required. */
2040
fcc8e047 2041if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
2042 {
2043 yield = ERROR;
2044 goto SEND_QUIT;
2045 }
0756eb3c
PH
2046
2047/* From here until we send the DATA command, we can make use of PIPELINING
2048if the server host supports it. The code has to be able to check the responses
2049at any point, for when the buffer fills up, so we write it totally generally.
2050When PIPELINING is off, each command written reports that it has flushed the
2051buffer. */
2052
2053pending_MAIL = TRUE; /* The block starts with MAIL */
2054
3c8b3577
JH
2055 {
2056 uschar * s = return_path;
2057#ifdef EXPERIMENTAL_INTERNATIONAL
2058 uschar * errstr = NULL;
2059
2060 /* If we must downconvert, do the from-address here. Remember we had to
2061 for the to-addresses (done below), and also (ugly) for re-doing when building
2062 the delivery log line. */
2063
2064 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2065 {
2066 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2067 {
2068 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2069 yield = ERROR;
2070 goto SEND_QUIT;
2071 }
2072 setflag(addrlist, af_utf8_downcvt);
2073 }
2074#endif
2075
2076 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2077 "MAIL FROM:<%s>%s\r\n", s, buffer);
2078 }
2079
0756eb3c
PH
2080mail_command = string_copy(big_buffer); /* Save for later error message */
2081
2082switch(rc)
2083 {
2084 case -1: /* Transmission error */
7ade712c 2085 goto SEND_FAILED;
0756eb3c
PH
2086
2087 case +1: /* Block was sent */
7ade712c 2088 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2089 ob->command_timeout))
e97957bc 2090 {
7ade712c
JH
2091 if (errno == 0 && buffer[0] == '4')
2092 {
2093 errno = ERRNO_MAIL4XX;
2094 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2095 }
2096 goto RESPONSE_FAILED;
e97957bc 2097 }
7ade712c
JH
2098 pending_MAIL = FALSE;
2099 break;
0756eb3c
PH
2100 }
2101
2102/* Pass over all the relevant recipient addresses for this host, which are the
2103ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2104several before we have to read the responses for those seen so far. This
2105checking is done by a subroutine because it also needs to be done at the end.
2106Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2107the next one if not all are sent.
2108
2109In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2110last address because we want to abort if any recipients have any kind of
2111problem, temporary or permanent. We know that all recipient addresses will have
2112the PENDING_DEFER status, because only one attempt is ever made, and we know
2113that max_rcpt will be large, so all addresses will be done at once. */
2114
2115for (addr = first_addr;
2116 address_count < max_rcpt && addr != NULL;
2117 addr = addr->next)
2118 {
2119 int count;
2120 BOOL no_flush;
3c8b3577 2121 uschar * rcpt_addr;
0756eb3c 2122
a7538db1 2123 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2124
0756eb3c
PH
2125 if (addr->transport_return != PENDING_DEFER) continue;
2126
2127 address_count++;
2128 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2129
6c1c3d1d
WB
2130 /* Add any DSN flags to the rcpt command and add to the sent string */
2131
2132 p = buffer;
2133 *p = 0;
2134
a7538db1 2135 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
2136 {
2137 if ((addr->dsn_flags & rf_dsnflags) != 0)
2138 {
2139 int i;
2140 BOOL first = TRUE;
45500060 2141 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
2142 while (*p) p++;
2143 for (i = 0; i < 4; i++)
6c1c3d1d
WB
2144 if ((addr->dsn_flags & rf_list[i]) != 0)
2145 {
2146 if (!first) *p++ = ',';
2147 first = FALSE;
45500060 2148 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
2149 while (*p) p++;
2150 }
6c1c3d1d
WB
2151 }
2152
a7538db1
JH
2153 if (addr->dsn_orcpt != NULL)
2154 {
6c1c3d1d
WB
2155 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2156 addr->dsn_orcpt);
2157 while (*p) p++;
2158 }
2159 }
6c1c3d1d 2160
0756eb3c
PH
2161 /* Now send the RCPT command, and process outstanding responses when
2162 necessary. After a timeout on RCPT, we just end the function, leaving the
2163 yield as OK, because this error can often mean that there is a problem with
2164 just one address, so we don't want to delay the host. */
2165
3c8b3577
JH
2166 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2167
2168#ifdef EXPERIMENTAL_INTERNATIONAL
2169 {
2170 uschar * dummy_errstr;
2171 if ( testflag(addrlist, af_utf8_downcvt)
2172 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2173 dummy_errstr
2174 ) )
2175 {
2176 errno = ERRNO_EXPANDFAIL;
2177 goto SEND_FAILED;
2178 }
2179 }
2180#endif
2181
6c1c3d1d 2182 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2183 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2184
0756eb3c
PH
2185 if (count < 0) goto SEND_FAILED;
2186 if (count > 0)
2187 {
2188 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2189 &sync_addr, host, count, ob->address_retry_include_sender,
2190 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2191 sizeof(buffer)))
0756eb3c
PH
2192 {
2193 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2194 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2195 break;
2196
2197 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2198 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2199 case 0: /* No 2xx or 5xx, but no probs */
2200 break;
2201
2202 case -1: goto END_OFF; /* Timeout on RCPT */
2203 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2204 }
2205 pending_MAIL = FALSE; /* Dealt with MAIL */
2206 }
2207 } /* Loop for next address */
2208
2209/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2210permanently or temporarily. We should have flushed and synced after the last
2211RCPT. */
2212
2213if (mua_wrapper)
2214 {
2215 address_item *badaddr;
168dec3b
JH
2216 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2217 if (badaddr->transport_return != PENDING_OK)
2218 {
2219 /*XXX could we find a better errno than 0 here? */
2220 set_errno(addrlist, 0, badaddr->message, FAIL,
2221 testflag(badaddr, af_pass_message), NULL);
2222 ok = FALSE;
2223 break;
2224 }
0756eb3c
PH
2225 }
2226
2227/* If ok is TRUE, we know we have got at least one good recipient, and must now
2228send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2229have a good recipient buffered up if we are pipelining. We don't want to waste
2230time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2231are pipelining. The responses are all handled by sync_responses(). */
2232
2233if (ok || (smtp_use_pipelining && !mua_wrapper))
2234 {
2235 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2236 if (count < 0) goto SEND_FAILED;
2237 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2238 host, count, ob->address_retry_include_sender, pending_MAIL,
2239 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2240 {
2241 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2242 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2243 break;
2244
2245 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2246 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2247 case 0: break; /* No 2xx or 5xx, but no probs */
2248
2249 case -1: goto END_OFF; /* Timeout on RCPT */
2250 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2251 }
2252 }
2253
2254/* Save the first address of the next batch. */
2255
2256first_addr = addr;
2257
2258/* If there were no good recipients (but otherwise there have been no
2259problems), just set ok TRUE, since we have handled address-specific errors
2260already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2261for handling the SMTP dot-handling protocol, flagging to apply to headers as
2262well as body. Set the appropriate timeout value to be used for each chunk.
2263(Haven't been able to make it work using select() for writing yet.) */
2264
2265if (!ok) ok = TRUE; else
2266 {
2267 sigalrm_seen = FALSE;
2268 transport_write_timeout = ob->data_timeout;
2269 smtp_command = US"sending data block"; /* For error messages */
2270 DEBUG(D_transport|D_v)
2271 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2272 transport_count = 0;
a7538db1 2273
80a47a2c 2274#ifndef DISABLE_DKIM
4cd12fe9
TK
2275 ok = dkim_transport_write_message(addrlist, inblock.sock,
2276 topt_use_crlf | topt_end_dot | topt_escape_headers |
2277 (tblock->body_only? topt_no_headers : 0) |
2278 (tblock->headers_only? topt_no_body : 0) |
2279 (tblock->return_path_add? topt_add_return_path : 0) |
2280 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2281 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2282 0, /* No size limit */
2283 tblock->add_headers, tblock->remove_headers,
2284 US".", US"..", /* Escaping strings */
2285 tblock->rewrite_rules, tblock->rewrite_existflags,
2286 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2287 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2288 );
2289#else
0756eb3c
PH
2290 ok = transport_write_message(addrlist, inblock.sock,
2291 topt_use_crlf | topt_end_dot | topt_escape_headers |
2292 (tblock->body_only? topt_no_headers : 0) |
2293 (tblock->headers_only? topt_no_body : 0) |
2294 (tblock->return_path_add? topt_add_return_path : 0) |
2295 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2296 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2297 0, /* No size limit */
2298 tblock->add_headers, tblock->remove_headers,
2299 US".", US"..", /* Escaping strings */
2300 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2301#endif
0756eb3c
PH
2302
2303 /* transport_write_message() uses write() because it is called from other
2304 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2305 it can exit with "Broken pipe" as its error. This really means that the
2306 socket got closed at the far end. */
2307
2308 transport_write_timeout = 0; /* for subsequent transports */
2309
2310 /* Failure can either be some kind of I/O disaster (including timeout),
2311 or the failure of a transport filter or the expansion of added headers. */
2312
2313 if (!ok)
2314 {
2315 buffer[0] = 0; /* There hasn't been a response */
2316 goto RESPONSE_FAILED;
2317 }
2318
2319 /* We used to send the terminating "." explicitly here, but because of
2320 buffering effects at both ends of TCP/IP connections, you don't gain
2321 anything by keeping it separate, so it might as well go in the final
2322 data buffer for efficiency. This is now done by setting the topt_end_dot
2323 flag above. */
2324
2325 smtp_command = US"end of data";
2326
8ccd00b1 2327#ifndef DISABLE_PRDR
fd98a5c6
JH
2328 /* For PRDR we optionally get a partial-responses warning
2329 * followed by the individual responses, before going on with
2330 * the overall response. If we don't get the warning then deal
2331 * with per non-PRDR. */
2332 if(prdr_active)
2333 {
2334 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2335 ob->final_timeout);
2336 if (!ok && errno == 0)
2337 switch(buffer[0])
2338 {
2339 case '2': prdr_active = FALSE;
2340 ok = TRUE;
2341 break;
2342 case '4': errno = ERRNO_DATA4XX;
2343 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2344 break;
2345 }
2346 }
2347 else
2348#endif
2349
2350 /* For non-PRDR SMTP, we now read a single response that applies to the
2351 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2352
e97957bc
PH
2353 if (!lmtp)
2354 {
2355 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2356 ob->final_timeout);
2357 if (!ok && errno == 0 && buffer[0] == '4')
2358 {
2359 errno = ERRNO_DATA4XX;
2360 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2361 }
2362 }
0756eb3c
PH
2363
2364 /* For LMTP, we get back a response for every RCPT command that we sent;
2365 some may be accepted and some rejected. For those that get a response, their
2366 status is fixed; any that are accepted have been handed over, even if later
2367 responses crash - at least, that's how I read RFC 2033.
2368
2369 If all went well, mark the recipient addresses as completed, record which
2370 host/IPaddress they were delivered to, and cut out RSET when sending another
2371 message down the same channel. Write the completed addresses to the journal
2372 now so that they are recorded in case there is a crash of hardware or
2373 software before the spool gets updated. Also record the final SMTP
2374 confirmation if needed (for SMTP only). */
2375
2376 if (ok)
2377 {
2378 int flag = '=';
2379 int delivery_time = (int)(time(NULL) - start_delivery_time);
2380 int len;
0756eb3c
PH
2381 uschar *conf = NULL;
2382 send_rset = FALSE;
2383
0756eb3c
PH
2384 /* Set up confirmation if needed - applies only to SMTP */
2385
d68218c7 2386 if (
774ef2d7 2387#ifndef EXPERIMENTAL_EVENT
6c6d6e48 2388 LOGGING(smtp_confirmation) &&
a7538db1 2389#endif
d68218c7
JH
2390 !lmtp
2391 )
0756eb3c 2392 {
55414b25
JH
2393 const uschar *s = string_printing(buffer);
2394 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2395 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2396 }
2397
fd98a5c6 2398 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2399 each one. */
2400
2401 for (addr = addrlist; addr != first_addr; addr = addr->next)
2402 {
2403 if (addr->transport_return != PENDING_OK) continue;
2404
2405 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2406 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2407 address. For temporary errors, add a retry item for the address so that
2408 it doesn't get tried again too soon. */
0756eb3c 2409
8ccd00b1 2410#ifndef DISABLE_PRDR
fd98a5c6
JH
2411 if (lmtp || prdr_active)
2412#else
0756eb3c 2413 if (lmtp)
fd98a5c6 2414#endif
0756eb3c
PH
2415 {
2416 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2417 ob->final_timeout))
2418 {
2419 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2420 addr->message = string_sprintf(
8ccd00b1 2421#ifndef DISABLE_PRDR
fd98a5c6
JH
2422 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2423#else
2424 "LMTP error after %s: %s",
2425#endif
0756eb3c 2426 big_buffer, string_printing(buffer));
75def545
PH
2427 setflag(addr, af_pass_message); /* Allow message to go to user */
2428 if (buffer[0] == '5')
2429 addr->transport_return = FAIL;
2430 else
2431 {
e97957bc
PH
2432 errno = ERRNO_DATA4XX;
2433 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2434 addr->transport_return = DEFER;
8ccd00b1 2435#ifndef DISABLE_PRDR
fd98a5c6
JH
2436 if (!prdr_active)
2437#endif
2438 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2439 }
0756eb3c
PH
2440 continue;
2441 }
2442 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2443 if (LOGGING(smtp_confirmation))
c0ea85ab 2444 {
55414b25
JH
2445 const uschar *s = string_printing(buffer);
2446 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2447 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2448 }
0756eb3c
PH
2449 }
2450
2451 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2452 actual host that was used. */
0756eb3c
PH
2453
2454 addr->transport_return = OK;
2455 addr->more_errno = delivery_time;
d427a7f9 2456 addr->host_used = host;
0756eb3c
PH
2457 addr->special_action = flag;
2458 addr->message = conf;
8ccd00b1 2459#ifndef DISABLE_PRDR
fd98a5c6
JH
2460 if (prdr_active) addr->flags |= af_prdr_used;
2461#endif
0756eb3c
PH
2462 flag = '-';
2463
8ccd00b1 2464#ifndef DISABLE_PRDR
fd98a5c6
JH
2465 if (!prdr_active)
2466#endif
2467 {
2468 /* Update the journal. For homonymic addresses, use the base address plus
2469 the transport name. See lots of comments in deliver.c about the reasons
2470 for the complications when homonyms are involved. Just carry on after
2471 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2472
fd98a5c6
JH
2473 if (testflag(addr, af_homonym))
2474 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2475 else
2476 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2477
fd98a5c6
JH
2478 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2479 len = Ustrlen(CS buffer);
2480 if (write(journal_fd, buffer, len) != len)
2481 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2482 "%s: %s", buffer, strerror(errno));
2483 }
0756eb3c
PH
2484 }
2485
8ccd00b1 2486#ifndef DISABLE_PRDR
fd98a5c6
JH
2487 if (prdr_active)
2488 {
2489 /* PRDR - get the final, overall response. For any non-success
2490 upgrade all the address statuses. */
2491 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2492 ob->final_timeout);
2493 if (!ok)
2494 {
2495 if(errno == 0 && buffer[0] == '4')
2496 {
2497 errno = ERRNO_DATA4XX;
2498 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2499 }
2500 for (addr = addrlist; addr != first_addr; addr = addr->next)
2501 if (buffer[0] == '5' || addr->transport_return == OK)
2502 addr->transport_return = PENDING_OK; /* allow set_errno action */
2503 goto RESPONSE_FAILED;
2504 }
2505
2506 /* Update the journal, or setup retry. */
2507 for (addr = addrlist; addr != first_addr; addr = addr->next)
2508 if (addr->transport_return == OK)
2509 {
2510 if (testflag(addr, af_homonym))
2511 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2512 else
2513 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2514
fd98a5c6
JH
2515 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2516 len = Ustrlen(CS buffer);
2517 if (write(journal_fd, buffer, len) != len)
2518 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2519 "%s: %s", buffer, strerror(errno));
2520 }
2521 else if (addr->transport_return == DEFER)
2522 retry_add_item(addr, addr->address_retry_key, -2);
2523 }
2524#endif
2525
0756eb3c
PH
2526 /* Ensure the journal file is pushed out to disk. */
2527
54fc8428 2528 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2529 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2530 strerror(errno));
2531 }
2532 }
2533
2534
2535/* Handle general (not specific to one address) failures here. The value of ok
2536is used to skip over this code on the falling through case. A timeout causes a
2537deferral. Other errors may defer or fail according to the response code, and
2538may set up a special errno value, e.g. after connection chopped, which is
2539assumed if errno == 0 and there is no text in the buffer. If control reaches
2540here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2541the problem is not related to this specific message. */
2542
2543if (!ok)
2544 {
2545 int code;
2546
2547 RESPONSE_FAILED:
2548 save_errno = errno;
2549 message = NULL;
2550 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2551 buffer, &code, &message, &pass_message);
0756eb3c
PH
2552 goto FAILED;
2553
2554 SEND_FAILED:
2555 save_errno = errno;
2556 code = '4';
2557 message = US string_sprintf("send() to %s [%s] failed: %s",
2558 host->name, host->address, strerror(save_errno));
2559 send_quit = FALSE;
2560 goto FAILED;
2561
2562 /* This label is jumped to directly when a TLS negotiation has failed,
2563 or was not done for a host for which it is required. Values will be set
2564 in message and save_errno, and setting_up will always be true. Treat as
2565 a temporary error. */
2566
a7538db1 2567#ifdef SUPPORT_TLS
0756eb3c
PH
2568 TLS_FAILED:
2569 code = '4';
a7538db1 2570#endif
0756eb3c
PH
2571
2572 /* If the failure happened while setting up the call, see if the failure was
2573 a 5xx response (this will either be on connection, or following HELO - a 5xx
2574 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2575 never going to accept them. For other errors during setting up (timeouts or
2576 whatever), defer all addresses, and yield DEFER, so that the host is not
2577 tried again for a while. */
2578
2579 FAILED:
2580 ok = FALSE; /* For when reached by GOTO */
2581
2582 if (setting_up)
2583 {
2584 if (code == '5')
c562fd30 2585 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
0756eb3c
PH
2586 else
2587 {
c562fd30 2588 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2589 yield = DEFER;
2590 }
2591 }
2592
e97957bc 2593 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2594 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2595 the contents of the message rather than a real error on the connection. These
2596 cases are treated in the same way as a 4xx response. This next bit of code
2597 does the classification. */
0756eb3c 2598
e97957bc 2599 else
0756eb3c 2600 {
e97957bc 2601 BOOL message_error;
0756eb3c 2602
e97957bc
PH
2603 switch(save_errno)
2604 {
250b6871
JH
2605#ifdef EXPERIMENTAL_INTERNATIONAL
2606 case ERRNO_UTF8_FWD:
2607 code = '5';
2608 /*FALLTHROUGH*/
2609#endif
e97957bc
PH
2610 case 0:
2611 case ERRNO_MAIL4XX:
2612 case ERRNO_DATA4XX:
250b6871
JH
2613 message_error = TRUE;
2614 break;
0756eb3c 2615
e97957bc 2616 case ETIMEDOUT:
250b6871
JH
2617 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2618 Ustrncmp(smtp_command,"end ",4) == 0;
2619 break;
e97957bc
PH
2620
2621 case ERRNO_SMTPCLOSED:
250b6871
JH
2622 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2623 break;
e97957bc
PH
2624
2625 default:
250b6871
JH
2626 message_error = FALSE;
2627 break;
e97957bc 2628 }
0756eb3c 2629
e97957bc 2630 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2631
e97957bc
PH
2632 (a) negative response or timeout after MAIL
2633 (b) negative response after DATA
2634 (c) negative response or timeout or dropped connection after "."
250b6871 2635 (d) utf8 support required and not offered
0756eb3c 2636
e97957bc
PH
2637 It won't be a negative response or timeout after RCPT, as that is dealt
2638 with separately above. The action in all cases is to set an appropriate
2639 error code for all the addresses, but to leave yield set to OK because the
2640 host itself has not failed. Of course, it might in practice have failed
2641 when we've had a timeout, but if so, we'll discover that at the next
2642 delivery attempt. For a temporary error, set the message_defer flag, and
2643 write to the logs for information if this is not the last host. The error
2644 for the last host will be logged as part of the address's log line. */
2645
2646 if (message_error)
0756eb3c 2647 {
e97957bc
PH
2648 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2649 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
c562fd30 2650 pass_message, host);
e97957bc
PH
2651
2652 /* If there's an errno, the message contains just the identity of
2653 the host. */
2654
2655 if (code != '5') /* Anything other than 5 is treated as temporary */
2656 {
2657 if (save_errno > 0)
2658 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2659 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2660 msglog_line(host, message);
e97957bc
PH
2661 *message_defer = TRUE;
2662 }
2663 }
2664
2665 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2666 ".", or some other transportation error. We defer all addresses and yield
2667 DEFER, except for the case of failed add_headers expansion, or a transport
2668 filter failure, when the yield should be ERROR, to stop it trying other
2669 hosts. */
2670
2671 else
2672 {
2673 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2674 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
c562fd30 2675 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2676 }
2677 }
2678 }
2679
2680
2681/* If all has gone well, send_quit will be set TRUE, implying we can end the
2682SMTP session tidily. However, if there were too many addresses to send in one
2683message (indicated by first_addr being non-NULL) we want to carry on with the
2684rest of them. Also, it is desirable to send more than one message down the SMTP
2685connection if there are several waiting, provided we haven't already sent so
2686many as to hit the configured limit. The function transport_check_waiting looks
2687for a waiting message and returns its id. Then transport_pass_socket tries to
2688set up a continued delivery by passing the socket on to another process. The
2689variable send_rset is FALSE if a message has just been successfully transfered.
2690
2691If we are already sending down a continued channel, there may be further
2692addresses not yet delivered that are aimed at the same host, but which have not
2693been passed in this run of the transport. In this case, continue_more will be
2694true, and all we should do is send RSET if necessary, and return, leaving the
2695channel open.
2696
2697However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2698do not want to continue with other messages down the same channel, because that
2699can lead to looping between two or more messages, all with the same,
2700temporarily failing address(es). [The retry information isn't updated yet, so
2701new processes keep on trying.] We probably also don't want to try more of this
2702message's addresses either.
2703
2704If we have started a TLS session, we have to end it before passing the
2705connection to a new process. However, not all servers can handle this (Exim
2706can), so we do not pass such a connection on if the host matches
2707hosts_nopass_tls. */
2708
2709DEBUG(D_transport)
2710 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2711 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2712 continue_more, yield, (first_addr == NULL)? "":"not ");
2713
2714if (completed_address && ok && send_quit)
2715 {
2716 BOOL more;
a39bd74d
JB
2717 smtp_compare_t t_compare;
2718
2719 t_compare.tblock = tblock;
2720 t_compare.current_sender_address = sender_address;
2721
5130845b
JH
2722 if ( first_addr != NULL
2723 || continue_more
2724 || ( ( tls_out.active < 0
2725 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2726 )
0756eb3c
PH
2727 &&
2728 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
2729 tblock->connection_max_messages, new_message_id, &more,
2730 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2731 ) )
0756eb3c
PH
2732 {
2733 uschar *msg;
447d236c 2734 BOOL pass_message;
0756eb3c
PH
2735
2736 if (send_rset)
2737 {
2738 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2739 {
2740 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2741 host->address, strerror(save_errno));
2742 send_quit = FALSE;
2743 }
2744 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2745 ob->command_timeout)))
2746 {
2747 int code;
447d236c
PH
2748 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2749 &pass_message);
0756eb3c
PH
2750 if (!send_quit)
2751 {
c562fd30
JH
2752 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2753 host->name, host->address, msg);
0756eb3c
PH
2754 }
2755 }
2756 }
2757
2758 /* Either RSET was not needed, or it succeeded */
2759
2760 if (ok)
2761 {
2762 if (first_addr != NULL) /* More addresses still to be sent */
2763 { /* in this run of the transport */
2764 continue_sequence++; /* Causes * in logging */
2765 goto SEND_MESSAGE;
2766 }
2767 if (continue_more) return yield; /* More addresses for another run */
2768
2769 /* Pass the socket to a new Exim process. Before doing so, we must shut
2770 down TLS. Not all MTAs allow for the continuation of the SMTP session
2771 when TLS is shut down. We test for this by sending a new EHLO. If we
2772 don't get a good response, we don't attempt to pass the socket on. */
2773
a7538db1 2774#ifdef SUPPORT_TLS
817d9f57 2775 if (tls_out.active >= 0)
0756eb3c 2776 {
817d9f57 2777 tls_close(FALSE, TRUE);
061b7ebd
PP
2778 if (smtps)
2779 ok = FALSE;
2780 else
2781 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2782 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2783 ob->command_timeout);
0756eb3c 2784 }
a7538db1 2785#endif
0756eb3c
PH
2786
2787 /* If the socket is successfully passed, we musn't send QUIT (or
2788 indeed anything!) from here. */
2789
2790 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2791 new_message_id, inblock.sock))
2792 {
2793 send_quit = FALSE;
2794 }
2795 }
2796
2797 /* If RSET failed and there are addresses left, they get deferred. */
2798
c562fd30 2799 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
0756eb3c
PH
2800 }
2801 }
2802
2803/* End off tidily with QUIT unless the connection has died or the socket has
2804been passed to another process. There has been discussion on the net about what
2805to do after sending QUIT. The wording of the RFC suggests that it is necessary
2806to wait for a response, but on the other hand, there isn't anything one can do
2807with an error response, other than log it. Exim used to do that. However,
2808further discussion suggested that it is positively advantageous not to wait for
2809the response, but to close the session immediately. This is supposed to move
2810the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2811load from the server. (Hosts that are both servers and clients may not see much
2812difference, of course.) Further discussion indicated that this was safe to do
2813on Unix systems which have decent implementations of TCP/IP that leave the
2814connection around for a while (TIME_WAIT) after the application has gone away.
2815This enables the response sent by the server to be properly ACKed rather than
2816timed out, as can happen on broken TCP/IP implementations on other OS.
2817
2818This change is being made on 31-Jul-98. After over a year of trouble-free
2819operation, the old commented-out code was removed on 17-Sep-99. */
2820
2821SEND_QUIT:
2822if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2823
2824END_OFF:
2825
2826#ifdef SUPPORT_TLS
817d9f57 2827tls_close(FALSE, TRUE);
0756eb3c
PH
2828#endif
2829
2830/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2831works because the NULL setting is passed back to the calling process, and
2832remote_max_parallel is forced to 1 when delivering over an existing connection,
2833
2834If all went well and continue_more is set, we shouldn't actually get here if
2835there are further addresses, as the return above will be taken. However,
2836writing RSET might have failed, or there may be other addresses whose hosts are
2837specified in the transports, and therefore not visible at top level, in which
2838case continue_more won't get set. */
2839
f1e894f3 2840(void)close(inblock.sock);
a7538db1 2841
774ef2d7
JH
2842#ifdef EXPERIMENTAL_EVENT
2843(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2844#endif
2845
0756eb3c
PH
2846continue_transport = NULL;
2847continue_hostname = NULL;
2848return yield;
2849}
2850
2851
2852
2853
2854/*************************************************
2855* Closedown entry point *
2856*************************************************/
2857
2858/* This function is called when exim is passed an open smtp channel
2859from another incarnation, but the message which it has been asked
2860to deliver no longer exists. The channel is on stdin.
2861
2862We might do fancy things like looking for another message to send down
2863the channel, but if the one we sought has gone, it has probably been
2864delivered by some other process that itself will seek further messages,
2865so just close down our connection.
2866
2867Argument: pointer to the transport instance block
2868Returns: nothing
2869*/
2870
2871void
2872smtp_transport_closedown(transport_instance *tblock)
2873{
2874smtp_transport_options_block *ob =
2875 (smtp_transport_options_block *)(tblock->options_block);
2876smtp_inblock inblock;
2877smtp_outblock outblock;
2878uschar buffer[256];
2879uschar inbuffer[4096];
2880uschar outbuffer[16];
2881
2882inblock.sock = fileno(stdin);
2883inblock.buffer = inbuffer;
2884inblock.buffersize = sizeof(inbuffer);
2885inblock.ptr = inbuffer;
2886inblock.ptrend = inbuffer;
2887
2888outblock.sock = inblock.sock;
2889outblock.buffersize = sizeof(outbuffer);
2890outblock.buffer = outbuffer;
2891outblock.ptr = outbuffer;
2892outblock.cmd_count = 0;
2893outblock.authenticating = FALSE;
2894
2895(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2896(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2897 ob->command_timeout);
f1e894f3 2898(void)close(inblock.sock);
0756eb3c
PH
2899}
2900
2901
2902
2903/*************************************************
2904* Prepare addresses for delivery *
2905*************************************************/
2906
2907/* This function is called to flush out error settings from previous delivery
2908attempts to other hosts. It also records whether we got here via an MX record
2909or not in the more_errno field of the address. We are interested only in
2910addresses that are still marked DEFER - others may have got delivered to a
2911previously considered IP address. Set their status to PENDING_DEFER to indicate
2912which ones are relevant this time.
2913
2914Arguments:
2915 addrlist the list of addresses
2916 host the host we are delivering to
2917
2918Returns: the first address for this delivery
2919*/
2920
2921static address_item *
2922prepare_addresses(address_item *addrlist, host_item *host)
2923{
2924address_item *first_addr = NULL;
2925address_item *addr;
2926for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
2927 if (addr->transport_return == DEFER)
2928 {
2929 if (first_addr == NULL) first_addr = addr;
2930 addr->transport_return = PENDING_DEFER;
2931 addr->basic_errno = 0;
2932 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2933 addr->message = NULL;
a7538db1 2934#ifdef SUPPORT_TLS
168dec3b
JH
2935 addr->cipher = NULL;
2936 addr->ourcert = NULL;
2937 addr->peercert = NULL;
2938 addr->peerdn = NULL;
2939 addr->ocsp = OCSP_NOT_REQ;
a7538db1 2940#endif
168dec3b 2941 }
0756eb3c
PH
2942return first_addr;
2943}
2944
2945
2946
2947/*************************************************
2948* Main entry point *
2949*************************************************/
2950
2951/* See local README for interface details. As this is a remote transport, it is
2952given a chain of addresses to be delivered in one connection, if possible. It
2953always returns TRUE, indicating that each address has its own independent
2954status set, except if there is a setting up problem, in which case it returns
2955FALSE. */
2956
2957BOOL
2958smtp_transport_entry(
2959 transport_instance *tblock, /* data for this instantiation */
2960 address_item *addrlist) /* addresses we are working on */
2961{
2962int cutoff_retry;
2963int port;
2964int hosts_defer = 0;
2965int hosts_fail = 0;
2966int hosts_looked_up = 0;
2967int hosts_retry = 0;
2968int hosts_serial = 0;
2969int hosts_total = 0;
8e669ac1 2970int total_hosts_tried = 0;
0756eb3c
PH
2971address_item *addr;
2972BOOL expired = TRUE;
2973BOOL continuing = continue_hostname != NULL;
2974uschar *expanded_hosts = NULL;
2975uschar *pistring;
2976uschar *tid = string_sprintf("%s transport", tblock->name);
2977smtp_transport_options_block *ob =
2978 (smtp_transport_options_block *)(tblock->options_block);
2979host_item *hostlist = addrlist->host_list;
2980host_item *host = NULL;
2981
2982DEBUG(D_transport)
2983 {
2984 debug_printf("%s transport entered\n", tblock->name);
2985 for (addr = addrlist; addr != NULL; addr = addr->next)
2986 debug_printf(" %s\n", addr->address);
2987 if (continuing) debug_printf("already connected to %s [%s]\n",
2988 continue_hostname, continue_host_address);
2989 }
2990
f6c332bd
PH
2991/* Set the flag requesting that these hosts be added to the waiting
2992database if the delivery fails temporarily or if we are running with
2993queue_smtp or a 2-stage queue run. This gets unset for certain
2994kinds of error, typically those that are specific to the message. */
2995
2996update_waiting = TRUE;
2997
0756eb3c
PH
2998/* If a host list is not defined for the addresses - they must all have the
2999same one in order to be passed to a single transport - or if the transport has
3000a host list with hosts_override set, use the host list supplied with the
3001transport. It is an error for this not to exist. */
3002
3003if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3004 {
3005 if (ob->hosts == NULL)
3006 {
3007 addrlist->message = string_sprintf("%s transport called with no hosts set",
3008 tblock->name);
3009 addrlist->transport_return = PANIC;
3010 return FALSE; /* Only top address has status */
3011 }
3012
3013 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3014 ob->hosts);
3015
3016 /* If the transport's host list contains no '$' characters, and we are not
3017 randomizing, it is fixed and therefore a chain of hosts can be built once
3018 and for all, and remembered for subsequent use by other calls to this
3019 transport. If, on the other hand, the host list does contain '$', or we are
3020 randomizing its order, we have to rebuild it each time. In the fixed case,
3021 as the hosts string will never be used again, it doesn't matter that we
3022 replace all the : characters with zeros. */
3023
3024 if (ob->hostlist == NULL)
3025 {
3026 uschar *s = ob->hosts;
3027
3028 if (Ustrchr(s, '$') != NULL)
3029 {
d427a7f9 3030 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
3031 {
3032 addrlist->message = string_sprintf("failed to expand list of hosts "
3033 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3034 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3035 return FALSE; /* Only top address has status */
3036 }
3037 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3038 "\"%s\"\n", s, expanded_hosts);
3039 s = expanded_hosts;
3040 }
3041 else
3042 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3043
3044 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3045
e276e04b
TF
3046 /* Check that the expansion yielded something useful. */
3047 if (hostlist == NULL)
3048 {
3049 addrlist->message =
3050 string_sprintf("%s transport has empty hosts setting", tblock->name);
3051 addrlist->transport_return = PANIC;
3052 return FALSE; /* Only top address has status */
3053 }
3054
0756eb3c
PH
3055 /* If there was no expansion of hosts, save the host list for
3056 next time. */
3057
d427a7f9 3058 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
3059 }
3060
3061 /* This is not the first time this transport has been run in this delivery;
3062 the host list was built previously. */
3063
55414b25
JH
3064 else
3065 hostlist = ob->hostlist;
0756eb3c
PH
3066 }
3067
3068/* The host list was supplied with the address. If hosts_randomize is set, we
3069must sort it into a random order if it did not come from MX records and has not
3070already been randomized (but don't bother if continuing down an existing
3071connection). */
3072
3073else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3074 {
3075 host_item *newlist = NULL;
3076 while (hostlist != NULL)
3077 {
3078 host_item *h = hostlist;
3079 hostlist = hostlist->next;
3080
3081 h->sort_key = random_number(100);
3082
3083 if (newlist == NULL)
3084 {
3085 h->next = NULL;
3086 newlist = h;
3087 }
3088 else if (h->sort_key < newlist->sort_key)
3089 {
3090 h->next = newlist;
3091 newlist = h;
3092 }
3093 else
3094 {
3095 host_item *hh = newlist;
3096 while (hh->next != NULL)
3097 {
3098 if (h->sort_key < hh->next->sort_key) break;
3099 hh = hh->next;
3100 }
3101 h->next = hh->next;
3102 hh->next = h;
3103 }
3104 }
3105
3106 hostlist = addrlist->host_list = newlist;
3107 }
3108
2d280592 3109/* Sort out the default port. */
0756eb3c
PH
3110
3111if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3112
0756eb3c
PH
3113/* For each host-plus-IP-address on the list:
3114
3115. If this is a continued delivery and the host isn't the one with the
3116 current connection, skip.
3117
3118. If the status is unusable (i.e. previously failed or retry checked), skip.
3119
3120. If no IP address set, get the address, either by turning the name into
3121 an address, calling gethostbyname if gethostbyname is on, or by calling
3122 the DNS. The DNS may yield multiple addresses, in which case insert the
3123 extra ones into the list.
3124
3125. Get the retry data if not previously obtained for this address and set the
3126 field which remembers the state of this address. Skip if the retry time is
3127 not reached. If not, remember whether retry data was found. The retry string
3128 contains both the name and the IP address.
3129
3130. Scan the list of addresses and mark those whose status is DEFER as
3131 PENDING_DEFER. These are the only ones that will be processed in this cycle
3132 of the hosts loop.
3133
3134. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3135 Some addresses may be successfully delivered, others may fail, and yet
3136 others may get temporary errors and so get marked DEFER.
3137
3138. The return from the delivery attempt is OK if a connection was made and a
3139 valid SMTP dialogue was completed. Otherwise it is DEFER.
3140
3141. If OK, add a "remove" retry item for this host/IPaddress, if any.
3142
3143. If fail to connect, or other defer state, add a retry item.
3144
3145. If there are any addresses whose status is still DEFER, carry on to the
3146 next host/IPaddress, unless we have tried the number of hosts given
533244af 3147 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
3148 there is some fancy logic for hosts_max_try that means its limit can be
3149 overstepped in some circumstances.
0756eb3c
PH
3150
3151If we get to the end of the list, all hosts have deferred at least one address,
3152or not reached their retry times. If delay_after_cutoff is unset, it requests a
3153delivery attempt to those hosts whose last try was before the arrival time of
3154the current message. To cope with this, we have to go round the loop a second
3155time. After that, set the status and error data for any addresses that haven't
3156had it set already. */
3157
3158for (cutoff_retry = 0; expired &&
3159 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3160 cutoff_retry++)
3161 {
3162 host_item *nexthost = NULL;
3163 int unexpired_hosts_tried = 0;
3164
3165 for (host = hostlist;
8e669ac1 3166 host != NULL &&
533244af
PH
3167 unexpired_hosts_tried < ob->hosts_max_try &&
3168 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
3169 host = nexthost)
3170 {
3171 int rc;
3172 int host_af;
3173 uschar *rs;
3174 BOOL serialized = FALSE;
3175 BOOL host_is_expired = FALSE;
3176 BOOL message_defer = FALSE;
3177 BOOL ifchanges = FALSE;
3178 BOOL some_deferred = FALSE;
3179 address_item *first_addr = NULL;
3180 uschar *interface = NULL;
3181 uschar *retry_host_key = NULL;
3182 uschar *retry_message_key = NULL;
3183 uschar *serialize_key = NULL;
3184
9c4e8f60
PH
3185 /* Default next host is next host. :-) But this can vary if the
3186 hosts_max_try limit is hit (see below). It may also be reset if a host
3187 address is looked up here (in case the host was multihomed). */
3188
3189 nexthost = host->next;
3190
0756eb3c
PH
3191 /* If the address hasn't yet been obtained from the host name, look it up
3192 now, unless the host is already marked as unusable. If it is marked as
3193 unusable, it means that the router was unable to find its IP address (in
3194 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3195 the lookup failed last time. We don't get this far if *all* MX records
3196 point to non-existent hosts; that is treated as a hard error.
3197
3198 We can just skip this host entirely. When the hosts came from the router,
3199 the address will timeout based on the other host(s); when the address is
3200 looked up below, there is an explicit retry record added.
3201
3202 Note that we mustn't skip unusable hosts if the address is not unset; they
3203 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3204
3205 if (host->address == NULL)
3206 {
322050c2 3207 int new_port, flags;
7cd1141b 3208 host_item *hh;
0756eb3c
PH
3209
3210 if (host->status >= hstatus_unusable)
3211 {
3212 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3213 host->name);
3214 continue;
3215 }
3216
3217 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3218
7cd1141b
PH
3219 /* The host name is permitted to have an attached port. Find it, and
3220 strip it from the name. Just remember it for now. */
3221
3222 new_port = host_item_get_port(host);
3223
3224 /* Count hosts looked up */
3225
0756eb3c
PH
3226 hosts_looked_up++;
3227
3228 /* Find by name if so configured, or if it's an IP address. We don't
3229 just copy the IP address, because we need the test-for-local to happen. */
3230
322050c2
PH
3231 flags = HOST_FIND_BY_A;
3232 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3233 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3234
7e66e54d 3235 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3236 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3237 else
0756eb3c 3238 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3239 &ob->dnssec, /* domains for request/require */
55414b25 3240 NULL, NULL);
0756eb3c 3241
7cd1141b
PH
3242 /* Update the host (and any additional blocks, resulting from
3243 multihoming) with a host-specific port, if any. */
3244
3245 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3246
0756eb3c
PH
3247 /* Failure to find the host at this time (usually DNS temporary failure)
3248 is really a kind of routing failure rather than a transport failure.
3249 Therefore we add a retry item of the routing kind, not to stop us trying
3250 to look this name up here again, but to ensure the address gets timed
3251 out if the failures go on long enough. A complete failure at this point
3252 commonly points to a configuration error, but the best action is still
3253 to carry on for the next host. */
3254
3255 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3256 {
3257 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3258 expired = FALSE;
3259 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3260 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3261 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3262 host->status = hstatus_unusable;
3263
3264 for (addr = addrlist; addr != NULL; addr = addr->next)
3265 {
3266 if (addr->transport_return != DEFER) continue;
3267 addr->basic_errno = ERRNO_UNKNOWNHOST;
3268 addr->message =
3269 string_sprintf("failed to lookup IP address for %s", host->name);
3270 }
3271 continue;
3272 }
3273
3274 /* If the host is actually the local host, we may have a problem, or
3275 there may be some cunning configuration going on. In the problem case,
3276 log things and give up. The default transport status is already DEFER. */
3277
3278 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3279 {
3280 for (addr = addrlist; addr != NULL; addr = addr->next)
3281 {
3282 addr->basic_errno = 0;
3283 addr->message = string_sprintf("%s transport found host %s to be "
3284 "local", tblock->name, host->name);
3285 }
3286 goto END_TRANSPORT;
3287 }
3288 } /* End of block for IP address lookup */
3289
3290 /* If this is a continued delivery, we are interested only in the host
3291 which matches the name of the existing open channel. The check is put
3292 here after the local host lookup, in case the name gets expanded as a
3293 result of the lookup. Set expired FALSE, to save the outer loop executing
3294 twice. */
3295
3296 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3297 Ustrcmp(continue_host_address, host->address) != 0))
3298 {
3299 expired = FALSE;
3300 continue; /* With next host */
3301 }
3302
9c4e8f60
PH
3303 /* Reset the default next host in case a multihomed host whose addresses
3304 are not looked up till just above added to the host list. */
83364d30
PH
3305
3306 nexthost = host->next;
3307
0756eb3c
PH
3308 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3309 domain is in queue_smtp_domains, we don't actually want to attempt any
3310 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3311 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3312 were not in it. We don't want to hold up all SMTP deliveries! Except when
3313 doing a two-stage queue run, don't do this if forcing. */
3314
3315 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH
3316 match_isinlist(addrlist->domain,
3317 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3318 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3319 {
3320 expired = FALSE;
3321 for (addr = addrlist; addr != NULL; addr = addr->next)
3322 {
3323 if (addr->transport_return != DEFER) continue;
3324 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3325 }
3326 continue; /* With next host */
3327 }
3328
3329 /* Count hosts being considered - purely for an intelligent comment
3330 if none are usable. */
3331
3332 hosts_total++;
3333
3334 /* Set $host and $host address now in case they are needed for the
3335 interface expansion or the serialize_hosts check; they remain set if an
3336 actual delivery happens. */
3337
3338 deliver_host = host->name;
3339 deliver_host_address = host->address;
783b385f
JH
3340 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3341 : host->dnssec == DS_NO ? US"no"
3342 : US"";
0756eb3c 3343
7cd1141b
PH
3344 /* Set up a string for adding to the retry key if the port number is not
3345 the standard SMTP port. A host may have its own port setting that overrides
3346 the default. */
3347
3348 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3349 port : host->port);
3350 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3351
0756eb3c
PH
3352 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3353 string changes upon expansion, we must add it to the key that is used for
3354 retries, because connections to the same host from a different interface
3355 should be treated separately. */
3356
3357 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3358 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3359 &interface, tid))
3360 return FALSE;
3361 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3362
3363 /* The first time round the outer loop, check the status of the host by
3364 inspecting the retry data. The second time round, we are interested only
3365 in expired hosts that haven't been tried since this message arrived. */
3366
3367 if (cutoff_retry == 0)
3368 {
9c695f6d 3369 BOOL incl_ip;
0756eb3c 3370 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3371 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH
3372 messages) and also data for retries of a specific message at this host.
3373 If either of these retry records are actually read, the keys used are
3374 returned to save recomputing them later. */
3375
9c695f6d
JH
3376 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3377 US"retry_include_ip_address", ob->retry_include_ip_address,
3378 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3379 continue; /* with next host */
3380
0756eb3c 3381 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3382 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH
3383
3384 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3385 (host->address == NULL)? US"" : host->address, pistring,
3386 (host->status == hstatus_usable)? "usable" :
3387 (host->status == hstatus_unusable)? "unusable" :
3388 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3389
3390 /* Skip this address if not usable at this time, noting if it wasn't
3391 actually expired, both locally and in the address. */
3392
3393 switch (host->status)
3394 {
3395 case hstatus_unusable:
3396 expired = FALSE;
3397 setflag(addrlist, af_retry_skipped);
3398 /* Fall through */
3399
3400 case hstatus_unusable_expired:
3401 switch (host->why)
3402 {
3403 case hwhy_retry: hosts_retry++; break;
3404 case hwhy_failed: hosts_fail++; break;
3405 case hwhy_deferred: hosts_defer++; break;
3406 }
3407
3408 /* If there was a retry message key, implying that previously there
3409 was a message-specific defer, we don't want to update the list of
f6c332bd 3410 messages waiting for these hosts. */
0756eb3c 3411
f6c332bd 3412 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3413 continue; /* With the next host or IP address */
3414 }
3415 }
3416
3417 /* Second time round the loop: if the address is set but expired, and
3418 the message is newer than the last try, let it through. */
3419
3420 else
3421 {
3422 if (host->address == NULL ||
3423 host->status != hstatus_unusable_expired ||
3424 host->last_try > received_time)
3425 continue;
3426 DEBUG(D_transport)
3427 debug_printf("trying expired host %s [%s]%s\n",
3428 host->name, host->address, pistring);
3429 host_is_expired = TRUE;
3430 }
3431
3432 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3433 it remains TRUE only if all hosts are expired and none are actually tried.
3434 */
3435
3436 expired = FALSE;
3437
3438 /* If this host is listed as one to which access must be serialized,
3439 see if another Exim process has a connection to it, and if so, skip
3440 this host. If not, update the database to record our connection to it
3441 and remember this for later deletion. Do not do any of this if we are
3442 sending the message down a pre-existing connection. */
3443
3444 if (!continuing &&
5130845b 3445 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH
3446 {
3447 serialize_key = string_sprintf("host-serialize-%s", host->name);
3448 if (!enq_start(serialize_key))
3449 {
3450 DEBUG(D_transport)
3451 debug_printf("skipping host %s because another Exim process "
3452 "is connected to it\n", host->name);
3453 hosts_serial++;
3454 continue;
3455 }
3456 serialized = TRUE;
3457 }
3458
3459 /* OK, we have an IP address that is not waiting for its retry time to
3460 arrive (it might be expired) OR (second time round the loop) we have an
3461 expired host that hasn't been tried since the message arrived. Have a go
3462 at delivering the message to it. First prepare the addresses by flushing
3463 out the result of previous attempts, and finding the first address that
3464 is still to be delivered. */
3465
3466 first_addr = prepare_addresses(addrlist, host);
3467
3468 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3469 message_id, host->name, host->address, addrlist->address,
3470 (addrlist->next == NULL)? "" : ", ...");
3471
3472 set_process_info("delivering %s to %s [%s] (%s%s)",
3473 message_id, host->name, host->address, addrlist->address,
3474 (addrlist->next == NULL)? "" : ", ...");
3475
3476 /* This is not for real; don't do the delivery. If there are
3477 any remaining hosts, list them. */
3478
3479 if (dont_deliver)
3480 {
3481 host_item *host2;
c562fd30 3482 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
0756eb3c
PH
3483 for (addr = addrlist; addr != NULL; addr = addr->next)
3484 {
3485 addr->host_used = host;
3486 addr->special_action = '*';
3487 addr->message = US"delivery bypassed by -N option";
3488 }
3489 DEBUG(D_transport)
3490 {
3491 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3492 "*** host and remaining hosts:\n", tblock->name);
3493 for (host2 = host; host2 != NULL; host2 = host2->next)
3494 debug_printf(" %s [%s]\n", host2->name,
3495 (host2->address == NULL)? US"unset" : host2->address);
3496 }