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TLS: retire obsolete options gnutls_require_{kx,mac,proto)
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH		 1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
80fea873 5/* Copyright (c) University of Cambridge 1995 - 2016 */
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) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH		 81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 83#ifdef SUPPORT_TLS
0756eb3c
PH		 84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 86#endif
0756eb3c
PH		 87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH		 89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 91#ifdef SUPPORT_TLS
0756eb3c
PH		 92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 94#endif
0756eb3c
PH		 95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 99#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
44662487
JH		 100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
102#endif
0756eb3c
PH		 103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 105#ifdef SUPPORT_TLS
7a31d643
JH		 106# ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
109# endif
f2de3a33 110# ifndef DISABLE_OCSP
f5d78688
JH		 111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
113# endif
0756eb3c
PH		 114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 116#endif
0756eb3c
PH		 117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 119#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
96e47838
TL		 120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122#endif
8ccd00b1 123#ifndef DISABLE_PRDR
fd98a5c6
JH		 124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126#endif
99400968
JH		 127#ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130#endif
0756eb3c
PH		 131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH		 135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH		 137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
506900af 139 { "multi_domain", opt_expand_bool | opt_public,
0756eb3c
PH		 140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 145 { "retry_include_ip_address", opt_expand_bool,
0756eb3c
PH		 146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 151#ifdef SUPPORT_SOCKS
7eb6c37c
JH		 152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154#endif
80a47a2c 155#ifdef SUPPORT_TLS
0756eb3c
PH		 156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP		 160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH		 162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 164 { "tls_require_ciphers", opt_stringptr,
0756eb3c 165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP		 166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH		 168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
a63be306
WB		 170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
e51c7be2
JH		 172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 174 { "tls_verify_certificates", opt_stringptr,
a63be306
WB		 175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 178#endif
0756eb3c
PH		 179};
180
181/* Size of the options list. An extern variable has to be used so that its
182address can appear in the tables drtables.c. */
183
184int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187/* Default private options block for the smtp transport. */
188
189smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
9e4f5962 199 NULL, /* DSCP */
0756eb3c
PH		 200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
96e47838
TL		 203#ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
7a31d643 205 NULL, /* hosts_require_dane */
96e47838 206#endif
8ccd00b1 207#ifndef DISABLE_PRDR
ad07e9ad 208 US"*", /* hosts_try_prdr */
f5d78688 209#endif
f2de3a33 210#ifndef DISABLE_OCSP
0e66b3b6 211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688 212 NULL, /* hosts_require_ocsp */
fd98a5c6 213#endif
0756eb3c
PH		 214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
6c9ed72e 216 NULL, /* hosts_verify_avoid_tls */
c51b8e75 217 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH		 218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
8e669ac1 226 50, /* hosts_max_try_hardlimit */
48c7f9e2 227 TRUE, /* address_retry_include_sender */
0756eb3c 228 FALSE, /* allow_localhost */
382afc6b 229 FALSE, /* authenticated_sender_force */
0756eb3c
PH		 230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
0539a19d 233 { NULL, NULL }, /* dnssec_domains {request,require} */
0756eb3c
PH		 234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
f1513293 238 FALSE, /* lmtp_ignore_quota */
9c695f6d 239 NULL, /* expand_retry_include_ip_address */
0756eb3c 240 TRUE /* retry_include_ip_address */
f0989ec0 241#ifdef SUPPORT_SOCKS
7eb6c37c 242 ,NULL /* socks_proxy */
b8bf753b 243#endif
80a47a2c 244#ifdef SUPPORT_TLS
0756eb3c
PH		 245 ,NULL, /* tls_certificate */
246 NULL, /* tls_crl */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
54c90be1 249 NULL, /* tls_sni */
0e0f3f56 250 US"system", /* tls_verify_certificates */
54c90be1
PP		 251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
a63be306
WB		 253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
610ff438 255 US"*", /* tls_try_verify_hosts */
01a4a5c5 256 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK		 257#endif
258#ifndef DISABLE_DKIM
f7572e5a
TK		 259 ,NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL /* dkim_strict */
80a47a2c 265#endif
0756eb3c
PH		 266};
267
6c1c3d1d
WB		 268/* some DSN flags for use later */
269
270static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
45500060 273static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB		 274
275
0756eb3c
PH		 276
277/* Local statics */
278
279static uschar *smtp_command; /* Points to last cmd for error messages */
280static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 281static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH		 282
283
284/*************************************************
285* Setup entry point *
286*************************************************/
287
288/* This function is called when the transport is about to be used,
289but before running it in a sub-process. It is used for two things:
290
291 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH		 292 (2) To pass back the interface, port, protocol, and other options, for use
293 during callout verification.
0756eb3c
PH		 294
295Arguments:
296 tblock pointer to the transport instance block
297 addrlist list of addresses about to be transported
298 tf if not NULL, pointer to block in which to return options
929ba01c
PH		 299 uid the uid that will be set (not used)
300 gid the gid that will be set (not used)
0756eb3c
PH		 301 errmsg place for error message (not used)
302
303Returns: OK always (FAIL, DEFER not used)
304*/
305
306static int
307smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 308 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH		 309{
310smtp_transport_options_block *ob =
311 (smtp_transport_options_block *)(tblock->options_block);
312
313errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH		 314uid = uid;
315gid = gid;
0756eb3c
PH		 316
317/* Pass back options if required. This interface is getting very messy. */
318
319if (tf != NULL)
320 {
321 tf->interface = ob->interface;
322 tf->port = ob->port;
323 tf->protocol = ob->protocol;
324 tf->hosts = ob->hosts;
325 tf->hosts_override = ob->hosts_override;
326 tf->hosts_randomize = ob->hosts_randomize;
327 tf->gethostbyname = ob->gethostbyname;
328 tf->qualify_single = ob->dns_qualify_single;
329 tf->search_parents = ob->dns_search_parents;
26da7e20 330 tf->helo_data = ob->helo_data;
0756eb3c
PH		 331 }
332
333/* Set the fallback host list for all the addresses that don't have fallback
334host lists, provided that the local host wasn't present in the original host
335list. */
336
337if (!testflag(addrlist, af_local_host_removed))
338 {
339 for (; addrlist != NULL; addrlist = addrlist->next)
340 if (addrlist->fallback_hosts == NULL)
341 addrlist->fallback_hosts = ob->fallback_hostlist;
342 }
343
344return OK;
345}
346
347
348
349/*************************************************
350* Initialization entry point *
351*************************************************/
352
353/* Called for each instance, after its options have been read, to
354enable consistency checks to be done, or anything else that needs
355to be set up.
356
357Argument: pointer to the transport instance block
358Returns: nothing
359*/
360
361void
362smtp_transport_init(transport_instance *tblock)
363{
364smtp_transport_options_block *ob =
365 (smtp_transport_options_block *)(tblock->options_block);
366
367/* Retry_use_local_part defaults FALSE if unset */
368
369if (tblock->retry_use_local_part == TRUE_UNSET)
370 tblock->retry_use_local_part = FALSE;
371
372/* Set the default port according to the protocol */
373
374if (ob->port == NULL)
061b7ebd
PP		 375 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
376 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH		 377
378/* Set up the setup entry point, to be called before subprocesses for this
379transport. */
380
381tblock->setup = smtp_transport_setup;
382
383/* Complain if any of the timeouts are zero. */
384
385if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
386 ob->final_timeout <= 0)
387 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
388 "command, data, or final timeout value is zero for %s transport",
389 tblock->name);
390
391/* If hosts_override is set and there are local hosts, set the global
392flag that stops verify from showing router hosts. */
393
394if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
395
396/* If there are any fallback hosts listed, build a chain of host items
397for them, but do not do any lookups at this time. */
398
399host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
400}
401
402
403
404
405
406/*************************************************
407* Set delivery info into all active addresses *
408*************************************************/
409
410/* Only addresses whose status is >= PENDING are relevant. A lesser
411status means that an address is not currently being processed.
412
413Arguments:
447d236c
PH		 414 addrlist points to a chain of addresses
415 errno_value to put in each address's errno field
416 msg to put in each address's message field
417 rc to put in each address's transport_return field
418 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 419 host if set, mark addrs as having used this host
895fbaf2
JH		 420 smtp_greeting from peer
421 helo_response from peer
0756eb3c
PH		 422
423If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425this particular type of timeout.
426
427Returns: nothing
428*/
429
7cd1141b
PH		 430static void
431set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
895fbaf2
JH		 432 BOOL pass_message, host_item * host
433#ifdef EXPERIMENTAL_DSN_INFO
434 , const uschar * smtp_greeting, const uschar * helo_response
435#endif
436 )
0756eb3c
PH		 437{
438address_item *addr;
439int orvalue = 0;
440if (errno_value == ERRNO_CONNECTTIMEOUT)
441 {
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
444 }
895fbaf2 445for (addr = addrlist; addr; addr = addr->next)
168dec3b 446 if (addr->transport_return >= PENDING)
447d236c 447 {
168dec3b
JH		 448 addr->basic_errno = errno_value;
449 addr->more_errno |= orvalue;
450 if (msg != NULL)
451 {
452 addr->message = msg;
453 if (pass_message) setflag(addr, af_pass_message);
454 }
455 addr->transport_return = rc;
456 if (host)
895fbaf2 457 {
168dec3b 458 addr->host_used = host;
895fbaf2
JH		 459#ifdef EXPERIMENTAL_DSN_INFO
460 if (smtp_greeting)
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
463
464 if (helo_response)
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
467#endif
468 }
447d236c 469 }
0756eb3c
PH		 470}
471
895fbaf2
JH		 472static void
473set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
474 BOOL pass_message)
475{
476set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
477#ifdef EXPERIMENTAL_DSN_INFO
478 , NULL, NULL
479#endif
480 );
481}
0756eb3c
PH		 482
483
484/*************************************************
485* Check an SMTP response *
486*************************************************/
487
488/* This function is given an errno code and the SMTP response buffer
489to analyse, together with the host identification for generating messages. It
490sets an appropriate message and puts the first digit of the response code into
491the yield variable. If no response was actually read, a suitable digit is
492chosen.
493
494Arguments:
447d236c
PH		 495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an errror message
501 pass_message set TRUE if message is an SMTP response
502
503Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH		 504*/
505
a7538db1
JH		 506static BOOL
507check_response(host_item *host, int *errno_value, int more_errno,
447d236c 508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH		 509{
510uschar *pl = US"";
511
512if (smtp_use_pipelining &&
513 (Ustrcmp(smtp_command, "MAIL") == 0 ||
514 Ustrcmp(smtp_command, "RCPT") == 0 ||
515 Ustrcmp(smtp_command, "DATA") == 0))
516 pl = US"pipelined ";
517
518*yield = '4'; /* Default setting is to give a temporary error */
519
520/* Handle response timeout */
521
522if (*errno_value == ETIMEDOUT)
523 {
c562fd30
JH		 524 *message = US string_sprintf("SMTP timeout after %s%s",
525 pl, smtp_command);
0756eb3c
PH		 526 if (transport_count > 0)
527 *message = US string_sprintf("%s (%d bytes written)", *message,
528 transport_count);
529 return FALSE;
530 }
531
532/* Handle malformed SMTP response */
533
534if (*errno_value == ERRNO_SMTPFORMAT)
535 {
55414b25 536 const uschar *malfresp = string_printing(buffer);
0756eb3c 537 while (isspace(*malfresp)) malfresp++;
c562fd30
JH		 538 *message = *malfresp == 0
539 ? string_sprintf("Malformed SMTP reply (an empty line) "
540 "in response to %s%s", pl, smtp_command)
541 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
542 pl, smtp_command, malfresp);
0756eb3c
PH		 543 return FALSE;
544 }
545
546/* Handle a failed filter process error; can't send QUIT as we mustn't
547end the DATA. */
548
549if (*errno_value == ERRNO_FILTER_FAIL)
550 {
35af9f61 551 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 552 more_errno,
35af9f61 553 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH		 554 return FALSE;
555 }
556
557/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
558end the DATA. */
559
560if (*errno_value == ERRNO_CHHEADER_FAIL)
561 {
562 *message =
563 US string_sprintf("failed to expand headers_add or headers_remove: %s",
564 expand_string_message);
565 return FALSE;
566 }
567
568/* Handle failure to write a complete data block */
569
570if (*errno_value == ERRNO_WRITEINCOMPLETE)
571 {
572 *message = US string_sprintf("failed to write a data block");
573 return FALSE;
574 }
575
8c5d388a 576#ifdef SUPPORT_I18N
250b6871
JH		 577/* Handle lack of advertised SMTPUTF8, for international message */
578if (*errno_value == ERRNO_UTF8_FWD)
579 {
f358d5e0 580 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH		 581 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 return TRUE;
583 }
584#endif
585
0756eb3c
PH		 586/* Handle error responses from the remote mailer. */
587
588if (buffer[0] != 0)
589 {
55414b25 590 const uschar *s = string_printing(buffer);
447d236c 591 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 592 "%s", pl, smtp_command, s);
447d236c 593 *pass_message = TRUE;
0756eb3c
PH		 594 *yield = buffer[0];
595 return TRUE;
596 }
597
598/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH		 599connection closed) case, which causes deferral. An explicit connection reset
600error has the same effect. Otherwise, put the host's identity in the message,
601leaving the errno value to be interpreted as well. In all cases, we have to
602assume the connection is now dead. */
0756eb3c 603
19b9dc85 604if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH		 605 {
606 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH		 607 *message = US string_sprintf("Remote host closed connection "
608 "in response to %s%s", pl, smtp_command);
0756eb3c
PH		 609 }
610else *message = US string_sprintf("%s [%s]", host->name, host->address);
611
612return FALSE;
613}
614
615
616
617/*************************************************
618* Write error message to logs *
619*************************************************/
620
621/* This writes to the main log and to the message log.
622
623Arguments:
624 addr the address item containing error information
625 host the current host
626
627Returns: nothing
628*/
629
630static void
631write_logs(address_item *addr, host_item *host)
632{
c562fd30
JH		 633uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
634
1a47b633
JH		 635if (LOGGING(outgoing_port))
636 message = string_sprintf("%s:%d", message,
637 host->port == PORT_NONE ? 25 : host->port);
c562fd30 638if (addr->message)
0756eb3c 639 {
c562fd30 640 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH		 641 if (addr->basic_errno > 0)
642 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
643 log_write(0, LOG_MAIN, "%s", message);
644 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
645 }
646else
647 {
37f3dc43
JH		 648 const uschar * s = exim_errstr(addr->basic_errno);
649 log_write(0, LOG_MAIN, "%s %s", message, s);
650 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH		 651 }
652}
653
c562fd30
JH		 654static void
655msglog_line(host_item * host, uschar * message)
656{
37f3dc43
JH		 657deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
658 host->name, host->address, message);
c562fd30
JH		 659}
660
0756eb3c
PH		 661
662
0cbf2b82 663#ifndef DISABLE_EVENT
d68218c7
JH		 664/*************************************************
665* Post-defer action *
666*************************************************/
667
668/* This expands an arbitrary per-transport string.
669 It might, for example, be used to write to the database log.
670
671Arguments:
d68218c7
JH		 672 addr the address item containing error information
673 host the current host
674
675Returns: nothing
676*/
677
678static void
774ef2d7 679deferred_event_raise(address_item *addr, host_item *host)
d68218c7 680{
774ef2d7 681uschar * action = addr->transport->event_action;
55414b25 682const uschar * save_domain;
a7538db1
JH		 683uschar * save_local;
684
d68218c7 685if (!action)
a7538db1 686 return;
d68218c7 687
a7538db1
JH		 688save_domain = deliver_domain;
689save_local = deliver_localpart;
690
691/*XXX would ip & port already be set up? */
692deliver_host_address = string_copy(host->address);
774ef2d7
JH		 693deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
694event_defer_errno = addr->basic_errno;
d68218c7
JH		 695
696router_name = addr->router->name;
697transport_name = addr->transport->name;
a7538db1
JH		 698deliver_domain = addr->domain;
699deliver_localpart = addr->local_part;
700
774ef2d7 701(void) event_raise(action, US"msg:host:defer",
a7538db1
JH		 702 addr->message
703 ? addr->basic_errno > 0
704 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
705 : string_copy(addr->message)
706 : addr->basic_errno > 0
707 ? string_copy(US strerror(addr->basic_errno))
708 : NULL);
709
710deliver_localpart = save_local;
711deliver_domain = save_domain;
d68218c7
JH		 712router_name = transport_name = NULL;
713}
714#endif
715
0756eb3c
PH		 716/*************************************************
717* Synchronize SMTP responses *
718*************************************************/
719
720/* This function is called from smtp_deliver() to receive SMTP responses from
721the server, and match them up with the commands to which they relate. When
722PIPELINING is not in use, this function is called after every command, and is
723therefore somewhat over-engineered, but it is simpler to use a single scheme
724that works both with and without PIPELINING instead of having two separate sets
725of code.
726
727The set of commands that are buffered up with pipelining may start with MAIL
728and may end with DATA; in between are RCPT commands that correspond to the
729addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
730etc.) are never buffered.
731
732Errors after MAIL or DATA abort the whole process leaving the response in the
733buffer. After MAIL, pending responses are flushed, and the original command is
734re-instated in big_buffer for error messages. For RCPT commands, the remote is
735permitted to reject some recipient addresses while accepting others. However
736certain errors clearly abort the whole process. Set the value in
737transport_return to PENDING_OK if the address is accepted. If there is a
738subsequent general error, it will get reset accordingly. If not, it will get
739converted to OK at the end.
740
741Arguments:
48c7f9e2
PH		 742 addrlist the complete address list
743 include_affixes TRUE if affixes include in RCPT
744 sync_addr ptr to the ptr of the one to start scanning at (updated)
745 host the host we are connected to
746 count the number of responses to read
747 address_retry_
748 include_sender true if 4xx retry is to include the sender it its key
749 pending_MAIL true if the first response is for MAIL
750 pending_DATA 0 if last command sent was not DATA
751 +1 if previously had a good recipient
752 -1 if not previously had a good recipient
753 inblock incoming SMTP block
754 timeout timeout value
755 buffer buffer for reading response
756 buffsize size of buffer
0756eb3c
PH		 757
758Returns: 3 if at least one address had 2xx and one had 5xx
759 2 if at least one address had 5xx but none had 2xx
760 1 if at least one host had a 2xx response, but none had 5xx
761 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
762 -1 timeout while reading RCPT response
763 -2 I/O or other non-response error for RCPT
764 -3 DATA or MAIL failed - errno and buffer set
765*/
766
767static int
768sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH		 769 address_item **sync_addr, host_item *host, int count,
770 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH		 771 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
772 int buffsize)
773{
774address_item *addr = *sync_addr;
775int yield = 0;
776
777/* Handle the response for a MAIL command. On error, reinstate the original
778command in big_buffer for error message use, and flush any further pending
779responses before returning, except after I/O errors and timeouts. */
780
781if (pending_MAIL)
782 {
783 count--;
784 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
785 {
786 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
787 if (errno == 0 && buffer[0] != 0)
788 {
789 uschar flushbuffer[4096];
e97957bc
PH		 790 int save_errno = 0;
791 if (buffer[0] == '4')
792 {
793 save_errno = ERRNO_MAIL4XX;
794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 }
0756eb3c
PH		 796 while (count-- > 0)
797 {
798 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
799 '2', timeout)
800 && (errno != 0 || flushbuffer[0] == 0))
801 break;
802 }
e97957bc 803 errno = save_errno;
0756eb3c 804 }
c562fd30
JH		 805
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 while (count-- > 0) /* Mark any pending addrs with the host used */
808 {
809 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
810 addr->host_used = host;
811 addr = addr->next;
812 }
0756eb3c
PH		 813 return -3;
814 }
815 }
816
817if (pending_DATA) count--; /* Number of RCPT responses to come */
818
819/* Read and handle the required number of RCPT responses, matching each one up
820with an address by scanning for the next address whose status is PENDING_DEFER.
821*/
822
823while (count-- > 0)
824 {
825 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
826
827 /* The address was accepted */
c562fd30 828 addr->host_used = host;
0756eb3c
PH		 829
830 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
831 {
832 yield |= 1;
833 addr->transport_return = PENDING_OK;
834
835 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH		 836 ensure that any address-specific retry record is expunged. We do this both
837 for the basic key and for the version that also includes the sender. */
0756eb3c
PH		 838
839 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH		 840 {
841 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
842 sender_address);
843 retry_add_item(addr, altkey, rf_delete);
0756eb3c 844 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 845 }
0756eb3c
PH		 846 }
847
848 /* Timeout while reading the response */
849
850 else if (errno == ETIMEDOUT)
851 {
c562fd30
JH		 852 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
853 transport_rcpt_address(addr, include_affixes));
895fbaf2 854 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 855 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 856 update_waiting = FALSE;
0756eb3c
PH		 857 return -1;
858 }
859
860 /* Handle other errors in obtaining an SMTP response by returning -1. This
861 will cause all the addresses to be deferred. Restore the SMTP command in
862 big_buffer for which we are checking the response, so the error message
863 makes sense. */
864
865 else if (errno != 0 || buffer[0] == 0)
866 {
867 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
868 transport_rcpt_address(addr, include_affixes));
869 return -2;
870 }
871
872 /* Handle SMTP permanent and temporary response codes. */
873
874 else
875 {
876 addr->message =
447d236c 877 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH		 878 "%s", transport_rcpt_address(addr, include_affixes),
879 string_printing(buffer));
447d236c 880 setflag(addr, af_pass_message);
c562fd30 881 msglog_line(host, addr->message);
0756eb3c
PH		 882
883 /* The response was 5xx */
884
885 if (buffer[0] == '5')
886 {
887 addr->transport_return = FAIL;
888 yield |= 2;
889 }
890
891 /* The response was 4xx */
892
893 else
894 {
0756eb3c
PH		 895 addr->transport_return = DEFER;
896 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 897 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 898
0cbf2b82 899#ifndef DISABLE_EVENT
5ef5dd52
JB		 900 event_defer_errno = addr->more_errno;
901 msg_event_raise(US"msg:rcpt:host:defer", addr);
902#endif
903
c562fd30
JH		 904 /* Log temporary errors if there are more hosts to be tried.
905 If not, log this last one in the == line. */
0756eb3c 906
c562fd30
JH		 907 if (host->next)
908 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 909
0cbf2b82 910#ifndef DISABLE_EVENT
5ef5dd52
JB		 911 else
912 msg_event_raise(US"msg:rcpt:defer", addr);
913#endif
914
f6c332bd
PH		 915 /* Do not put this message on the list of those waiting for specific
916 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 917
f6c332bd 918 update_waiting = FALSE;
0756eb3c 919
48c7f9e2
PH		 920 /* Add a retry item for the address so that it doesn't get tried again
921 too soon. If address_retry_include_sender is true, add the sender address
922 to the retry key. */
0756eb3c 923
48c7f9e2
PH		 924 if (address_retry_include_sender)
925 {
926 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
927 sender_address);
928 retry_add_item(addr, altkey, 0);
929 }
930 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH		 931 }
932 }
933 } /* Loop for next RCPT response */
934
935/* Update where to start at for the next block of responses, unless we
936have already handled all the addresses. */
937
938if (addr != NULL) *sync_addr = addr->next;
939
940/* Handle a response to DATA. If we have not had any good recipients, either
941previously or in this block, the response is ignored. */
942
943if (pending_DATA != 0 &&
944 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
945 {
946 int code;
947 uschar *msg;
447d236c 948 BOOL pass_message;
e97957bc
PH		 949 if (pending_DATA > 0 || (yield & 1) != 0)
950 {
951 if (errno == 0 && buffer[0] == '4')
952 {
953 errno = ERRNO_DATA4XX;
954 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
955 }
956 return -3;
957 }
447d236c 958 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH		 959 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
960 "is in use and there were no good recipients\n", msg);
961 }
962
963/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
964present) received 3xx. If any RCPTs were handled and yielded anything other
965than 4xx, yield will be set non-zero. */
966
967return yield;
968}
969
970
971
fcc8e047
JH		 972/* Do the client side of smtp-level authentication */
973/*
974Arguments:
975 buffer EHLO response from server (gets overwritten)
976 addrlist chain of potential addresses to deliver
977 host host to deliver to
978 ob transport options
979 ibp, obp comms channel control blocks
980
981Returns:
982 OK Success, or failed (but not required): global "smtp_authenticated" set
983 DEFER Failed authentication (and was required)
984 ERROR Internal problem
985
986 FAIL_SEND Failed communications - transmit
987 FAIL - response
988*/
989
990int
991smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
992 smtp_transport_options_block *ob, BOOL is_esmtp,
993 smtp_inblock *ibp, smtp_outblock *obp)
994{
a7538db1
JH		 995int require_auth;
996uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 997
a7538db1
JH		 998smtp_authenticated = FALSE;
999client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1000require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1001
a7538db1
JH		 1002if (is_esmtp && !regex_AUTH) regex_AUTH =
1003 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1004 FALSE, TRUE);
fcc8e047 1005
a7538db1
JH		 1006if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1007 {
1008 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1009 expand_nmax = -1; /* reset */
fcc8e047 1010
a7538db1
JH		 1011 /* Must not do this check until after we have saved the result of the
1012 regex match above. */
fcc8e047 1013
a7538db1 1014 if (require_auth == OK ||
5130845b 1015 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH		 1016 {
1017 auth_instance *au;
1018 fail_reason = US"no common mechanisms were found";
fcc8e047 1019
a7538db1 1020 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1021
a7538db1
JH		 1022 /* Scan the configured authenticators looking for one which is configured
1023 for use as a client, which is not suppressed by client_condition, and
1024 whose name matches an authentication mechanism supported by the server.
1025 If one is found, attempt to authenticate by calling its client function.
1026 */
fcc8e047 1027
a7538db1
JH		 1028 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1029 {
1030 uschar *p = names;
1031 if (!au->client ||
1032 (au->client_condition != NULL &&
1033 !expand_check_condition(au->client_condition, au->name,
1034 US"client authenticator")))
1035 {
1036 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1037 au->name,
1038 (au->client)? "client_condition is false" :
1039 "not configured as a client");
1040 continue;
1041 }
fcc8e047 1042
a7538db1 1043 /* Loop to scan supported server mechanisms */
fcc8e047 1044
a7538db1
JH		 1045 while (*p != 0)
1046 {
1047 int rc;
1048 int len = Ustrlen(au->public_name);
1049 while (isspace(*p)) p++;
fcc8e047 1050
a7538db1
JH		 1051 if (strncmpic(au->public_name, p, len) != 0 ||
1052 (p[len] != 0 && !isspace(p[len])))
1053 {
1054 while (*p != 0 && !isspace(*p)) p++;
1055 continue;
1056 }
fcc8e047 1057
a7538db1
JH		 1058 /* Found data for a listed mechanism. Call its client entry. Set
1059 a flag in the outblock so that data is overwritten after sending so
1060 that reflections don't show it. */
fcc8e047 1061
a7538db1
JH		 1062 fail_reason = US"authentication attempt(s) failed";
1063 obp->authenticating = TRUE;
1064 rc = (au->info->clientcode)(au, ibp, obp,
1065 ob->command_timeout, buffer, bufsize);
1066 obp->authenticating = FALSE;
1067 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1068 au->name, rc);
fcc8e047 1069
a7538db1
JH		 1070 /* A temporary authentication failure must hold up delivery to
1071 this host. After a permanent authentication failure, we carry on
1072 to try other authentication methods. If all fail hard, try to
1073 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1074
a7538db1
JH		 1075 switch(rc)
1076 {
1077 case OK:
1078 smtp_authenticated = TRUE; /* stops the outer loop */
1079 client_authenticator = au->name;
1080 if (au->set_client_id != NULL)
1081 client_authenticated_id = expand_string(au->set_client_id);
1082 break;
1083
1084 /* Failure after writing a command */
1085
1086 case FAIL_SEND:
1087 return FAIL_SEND;
1088
1089 /* Failure after reading a response */
1090
1091 case FAIL:
1092 if (errno != 0 || buffer[0] != '5') return FAIL;
1093 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1094 au->name, host->name, host->address, buffer);
1095 break;
1096
1097 /* Failure by some other means. In effect, the authenticator
1098 decided it wasn't prepared to handle this case. Typically this
1099 is the result of "fail" in an expansion string. Do we need to
1100 log anything here? Feb 2006: a message is now put in the buffer
1101 if logging is required. */
1102
1103 case CANCELLED:
1104 if (*buffer != 0)
1105 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1106 "authentication H=%s [%s] %s", au->name, host->name,
1107 host->address, buffer);
1108 break;
1109
1110 /* Internal problem, message in buffer. */
1111
1112 case ERROR:
895fbaf2
JH		 1113 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1114 DEFER, FALSE);
a7538db1
JH		 1115 return ERROR;
1116 }
fcc8e047 1117
a7538db1
JH		 1118 break; /* If not authenticated, try next authenticator */
1119 } /* Loop for scanning supported server mechanisms */
1120 } /* Loop for further authenticators */
fcc8e047 1121 }
a7538db1 1122 }
fcc8e047 1123
a7538db1 1124/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1125
a7538db1
JH		 1126if (require_auth == OK && !smtp_authenticated)
1127 {
895fbaf2 1128 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1129 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1130 FALSE);
a7538db1
JH		 1131 return DEFER;
1132 }
4d8d62b9 1133
a7538db1 1134return OK;
fcc8e047
JH		 1135}
1136
1137
1138/* Construct AUTH appendix string for MAIL TO */
1139/*
1140Arguments
1141 buffer to build string
1142 addrlist chain of potential addresses to deliver
1143 ob transport options
1144
1145Globals smtp_authenticated
1146 client_authenticated_sender
1147Return True on error, otherwise buffer has (possibly empty) terminated string
1148*/
1149
1150BOOL
1151smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1152 smtp_transport_options_block *ob)
1153{
1154uschar *local_authenticated_sender = authenticated_sender;
1155
1156#ifdef notdef
1157 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1158#endif
1159
1160if (ob->authenticated_sender != NULL)
1161 {
1162 uschar *new = expand_string(ob->authenticated_sender);
1163 if (new == NULL)
1164 {
1165 if (!expand_string_forcedfail)
1166 {
1167 uschar *message = string_sprintf("failed to expand "
1168 "authenticated_sender: %s", expand_string_message);
895fbaf2 1169 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH		 1170 return TRUE;
1171 }
1172 }
1173 else if (new[0] != 0) local_authenticated_sender = new;
1174 }
1175
1176/* Add the authenticated sender address if present */
1177
1178if ((smtp_authenticated || ob->authenticated_sender_force) &&
1179 local_authenticated_sender != NULL)
1180 {
1181 string_format(buffer, bufsize, " AUTH=%s",
1182 auth_xtextencode(local_authenticated_sender,
1183 Ustrlen(local_authenticated_sender)));
1184 client_authenticated_sender = string_copy(local_authenticated_sender);
1185 }
1186else
1187 *buffer= 0;
1188
1189return FALSE;
1190}
1191
1192
1193
0e66b3b6 1194#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH		 1195/* Lookup TLSA record for host/port.
1196Return: OK success with dnssec; DANE mode
1197 DEFER Do not use this host now, may retry later
1198 FAIL_FORCED No TLSA record; DANE not usable
1199 FAIL Do not use this connection
1200*/
1201
0e66b3b6 1202int
4b0fe319 1203tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH		 1204{
1205/* move this out to host.c given the similarity to dns_lookup() ? */
1206uschar buffer[300];
55414b25 1207const uschar * fullname = buffer;
0e66b3b6
JH		 1208
1209/* TLSA lookup string */
1210(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1211
1212switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1213 {
0e66b3b6
JH		 1214 case DNS_SUCCEED:
1215 if (!dns_is_secure(dnsa))
1216 {
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 return DEFER;
1219 }
4b0fe319 1220 return OK;
2d5fdd53
JH		 1221
1222 case DNS_AGAIN:
1223 return DEFER; /* just defer this TLS'd conn */
1224
1225 case DNS_NOMATCH:
1226 return dane_required ? FAIL : FAIL_FORCED;
1227
1228 default:
1229 case DNS_FAIL:
1230 return dane_required ? FAIL : DEFER;
0e66b3b6 1231 }
0e66b3b6
JH		 1232}
1233#endif
1234
1235
a39bd74d
JB		 1236
1237typedef struct smtp_compare_s
1238{
1239 uschar *current_sender_address;
1240 struct transport_instance *tblock;
1241} smtp_compare_t;
1242
1243/*
1244Create a unique string that identifies this message, it is based on
1245sender_address, helo_data and tls_certificate if enabled. */
1246
1247static uschar *
1248smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249{
1250address_item * addr1;
1251uschar * if1 = US"";
1252uschar * helo1 = US"";
1253#ifdef SUPPORT_TLS
1254uschar * tlsc1 = US"";
1255#endif
1256uschar * save_sender_address = sender_address;
1257uschar * local_identity = NULL;
1258smtp_transport_options_block * ob =
1259 (smtp_transport_options_block *)tblock->options_block;
1260
1261sender_address = sender;
1262
1263addr1 = deliver_make_addr (sender, TRUE);
1264deliver_set_expansions(addr1);
1265
1266if (ob->interface)
1267 if1 = expand_string(ob->interface);
1268
1269if (ob->helo_data)
1270 helo1 = expand_string(ob->helo_data);
1271
1272#ifdef SUPPORT_TLS
1273if (ob->tls_certificate)
1274 tlsc1 = expand_string(ob->tls_certificate);
1275local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276#else
1277local_identity = string_sprintf ("%s^%s", if1, helo1);
1278#endif
1279
1280deliver_set_expansions(NULL);
1281sender_address = save_sender_address;
1282
1283return local_identity;
1284}
1285
1286
1287
1288/* This routine is a callback that is called from transport_check_waiting.
1289This function will evaluate the incoming message versus the previous
1290message. If the incoming message is using a different local identity then
1291we will veto this new message. */
1292
1293static BOOL
1294smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295{
dadff1d4
HSHR		 1296uschar * message_local_identity,
1297 * current_local_identity,
1298 * new_sender_address;
1299
1300current_local_identity =
a39bd74d 1301 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1302
dadff1d4
HSHR		 1303if (!(new_sender_address = deliver_get_sender_address(message_id)))
1304 return 0;
1305
1306message_local_identity =
1307 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB		 1308
1309return Ustrcmp(current_local_identity, message_local_identity) == 0;
1310}
1311
1312
1313
9094b84b
JH		 1314uschar
1315ehlo_response(uschar * buf, size_t bsize, uschar checks)
1316{
1317#ifdef SUPPORT_TLS
1318if (checks & PEER_OFFERED_TLS)
1319 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_TLS;
1321#endif
1322
1323 if ( checks & PEER_OFFERED_IGNQ
1324 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1325 PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_IGNQ;
1327
1328#ifndef DISABLE_PRDR
1329 if ( checks & PEER_OFFERED_PRDR
1330 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_PRDR;
1332#endif
1333
1334#ifdef SUPPORT_I18N
1335 if ( checks & PEER_OFFERED_UTF8
1336 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_UTF8;
1338#endif
1339
1340 if ( checks & PEER_OFFERED_DSN
1341 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_DSN;
1343
1344 if ( checks & PEER_OFFERED_PIPE
1345 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1346 PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_PIPE;
1348
1349 if ( checks & PEER_OFFERED_SIZE
1350 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_SIZE;
1352
1353return checks;
1354}
1355
1356
0756eb3c
PH		 1357/*************************************************
1358* Deliver address list to given host *
1359*************************************************/
1360
1361/* If continue_hostname is not null, we get here only when continuing to
1362deliver down an existing channel. The channel was passed as the standard
6c512171
PH		 1363input. TLS is never active on a passed channel; the previous process always
1364closes it down before passing the connection on.
0756eb3c
PH		 1365
1366Otherwise, we have to make a connection to the remote host, and do the
1367initial protocol exchange.
1368
1369When running as an MUA wrapper, if the sender or any recipient is rejected,
1370temporarily or permanently, we force failure for all recipients.
1371
1372Arguments:
1373 addrlist chain of potential addresses to deliver; only those whose
1374 transport_return field is set to PENDING_DEFER are currently
1375 being processed; others should be skipped - they have either
1376 been delivered to an earlier host or IP address, or been
1377 failed by one of them.
1378 host host to deliver to
1379 host_af AF_INET or AF_INET6
2d280592 1380 port default TCP/IP port to use, in host byte order
0756eb3c
PH		 1381 interface interface to bind to, or NULL
1382 tblock transport instance block
0756eb3c
PH		 1383 message_defer set TRUE if yield is OK, but all addresses were deferred
1384 because of a non-recipient, non-host failure, that is, a
1385 4xx response to MAIL FROM, DATA, or ".". This is a defer
1386 that is specific to the message.
1387 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1388 a second attempt after TLS initialization fails
1389
1390Returns: OK - the connection was made and the delivery attempted;
1391 the result for each address is in its data block.
1392 DEFER - the connection could not be made, or something failed
1393 while setting up the SMTP session, or there was a
1394 non-message-specific error, such as a timeout.
1395 ERROR - a filter command is specified for this transport,
1396 and there was a problem setting it up; OR helo_data
1397 or add_headers or authenticated_sender is specified
1398 for this transport, and the string failed to expand
1399*/
1400
1401static int
1402smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1403 uschar *interface, transport_instance *tblock,
0756eb3c
PH		 1404 BOOL *message_defer, BOOL suppress_tls)
1405{
1406address_item *addr;
1407address_item *sync_addr;
1408address_item *first_addr = addrlist;
1409int yield = OK;
1410int address_count;
1411int save_errno;
1412int rc;
1413time_t start_delivery_time = time(NULL);
1414smtp_transport_options_block *ob =
1415 (smtp_transport_options_block *)(tblock->options_block);
1416BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1417BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH		 1418BOOL ok = FALSE;
1419BOOL send_rset = TRUE;
1420BOOL send_quit = TRUE;
1421BOOL setting_up = TRUE;
1422BOOL completed_address = FALSE;
1423BOOL esmtp = TRUE;
1424BOOL pending_MAIL;
447d236c 1425BOOL pass_message = FALSE;
9094b84b 1426uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
8ccd00b1 1427#ifndef DISABLE_PRDR
fd98a5c6
JH		 1428BOOL prdr_active;
1429#endif
8c5d388a 1430#ifdef SUPPORT_I18N
3c8b3577 1431BOOL utf8_needed = FALSE;
7ade712c 1432#endif
6c1c3d1d 1433BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH		 1434#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1435BOOL dane = FALSE;
0539a19d 1436BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH		 1437dns_answer tlsa_dnsa;
1438#endif
0756eb3c
PH		 1439smtp_inblock inblock;
1440smtp_outblock outblock;
1441int max_rcpt = tblock->max_addresses;
f1513293 1442uschar *igquotstr = US"";
a39bd74d 1443
895fbaf2
JH		 1444#ifdef EXPERIMENTAL_DSN_INFO
1445uschar *smtp_greeting = NULL;
1446uschar *helo_response = NULL;
1447#endif
41c7c167 1448uschar *helo_data = NULL;
a39bd74d 1449
0756eb3c
PH		 1450uschar *message = NULL;
1451uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1452uschar *p;
1453uschar buffer[4096];
1454uschar inbuffer[4096];
98470202 1455uschar outbuffer[4096];
0756eb3c
PH		 1456
1457suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1458
1459*message_defer = FALSE;
1460smtp_command = US"initial connection";
1461if (max_rcpt == 0) max_rcpt = 999999;
1462
1463/* Set up the buffer for reading SMTP response packets. */
1464
1465inblock.buffer = inbuffer;
1466inblock.buffersize = sizeof(inbuffer);
1467inblock.ptr = inbuffer;
1468inblock.ptrend = inbuffer;
1469
1470/* Set up the buffer for holding SMTP commands while pipelining */
1471
1472outblock.buffer = outbuffer;
1473outblock.buffersize = sizeof(outbuffer);
1474outblock.ptr = outbuffer;
1475outblock.cmd_count = 0;
1476outblock.authenticating = FALSE;
1477
6c512171
PH		 1478/* Reset the parameters of a TLS session. */
1479
817d9f57
JH		 1480tls_out.bits = 0;
1481tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH		 1482tls_out.ourcert = NULL;
1483tls_out.peercert = NULL;
817d9f57
JH		 1484tls_out.peerdn = NULL;
1485#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1486tls_out.sni = NULL;
5b456975 1487#endif
018058b2 1488tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1489
35aba663
JH		 1490/* Flip the legacy TLS-related variables over to the outbound set in case
1491they're used in the context of the transport. Don't bother resetting
1492afterward as we're in a subprocess. */
1493
1494tls_modify_variables(&tls_out);
1495
061b7ebd
PP		 1496#ifndef SUPPORT_TLS
1497if (smtps)
1498 {
895fbaf2
JH		 1499 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1500 DEFER, FALSE);
018058b2 1501 return ERROR;
061b7ebd
PP		 1502 }
1503#endif
1504
0756eb3c
PH		 1505/* Make a connection to the host if this isn't a continued delivery, and handle
1506the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1507specially so they can be identified for retries. */
1508
1509if (continue_hostname == NULL)
1510 {
a7538db1 1511 /* This puts port into host->port */
0756eb3c 1512 inblock.sock = outblock.sock =
7eb6c37c 1513 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1514
0756eb3c
PH		 1515 if (inblock.sock < 0)
1516 {
895fbaf2
JH		 1517 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1518 NULL, DEFER, FALSE);
0756eb3c
PH		 1519 return DEFER;
1520 }
1521
0e66b3b6
JH		 1522#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1523 {
0e66b3b6
JH		 1524 tls_out.dane_verified = FALSE;
1525 tls_out.tlsa_usage = 0;
1526
0e66b3b6
JH		 1527 if (host->dnssec == DS_YES)
1528 {
4b0fe319
JH		 1529 if( dane_required
1530 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6 1531 )
2d5fdd53 1532 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
4b0fe319 1533 {
2d5fdd53
JH		 1534 case OK: dane = TRUE; break;
1535 case FAIL_FORCED: break;
1536 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1537 string_sprintf("DANE error: tlsa lookup %s",
1538 rc == DEFER ? "DEFER" : "FAIL"),
1539 rc, FALSE);
1540 return rc;
4b0fe319 1541 }
0e66b3b6
JH		 1542 }
1543 else if (dane_required)
1544 {
895fbaf2 1545 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1546 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1547 FAIL, FALSE);
4b0fe319 1548 return FAIL;
0e66b3b6
JH		 1549 }
1550
1551 if (dane)
1552 ob->tls_tempfail_tryclear = FALSE;
1553 }
1554#endif /*DANE*/
1555
41c7c167
PH		 1556 /* Expand the greeting message while waiting for the initial response. (Makes
1557 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1558 delayed till here so that $sending_interface and $sending_port are set. */
1559
1560 helo_data = expand_string(ob->helo_data);
8c5d388a 1561#ifdef SUPPORT_I18N
810d16ad
JH		 1562 if (helo_data)
1563 {
1564 uschar * errstr = NULL;
1565 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1566 {
1567 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1568 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH		 1569 yield = DEFER;
1570 goto SEND_QUIT;
1571 }
1572 }
1573#endif
41c7c167 1574
0756eb3c
PH		 1575 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1576 is nevertheless a reasonably clean way of programming this kind of logic,
1577 where you want to escape on any error. */
1578
061b7ebd
PP		 1579 if (!smtps)
1580 {
895fbaf2
JH		 1581 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1582 '2', ob->command_timeout);
1583#ifdef EXPERIMENTAL_DSN_INFO
1584 smtp_greeting = string_copy(buffer);
1585#endif
1586 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1587
0cbf2b82 1588#ifndef DISABLE_EVENT
b30275b8 1589 {
805c9d53
JH		 1590 uschar * s;
1591 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1592 : host->dnssec==DS_NO ? US"no" : NULL;
1593 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1594 if (s)
a7538db1 1595 {
895fbaf2 1596 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1597 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1598 DEFER, FALSE);
a7538db1
JH		 1599 yield = DEFER;
1600 goto SEND_QUIT;
1601 }
b30275b8 1602 }
a7538db1
JH		 1603#endif
1604
061b7ebd
PP		 1605 /* Now check if the helo_data expansion went well, and sign off cleanly if
1606 it didn't. */
41c7c167 1607
061b7ebd
PP		 1608 if (helo_data == NULL)
1609 {
1610 uschar *message = string_sprintf("failed to expand helo_data: %s",
1611 expand_string_message);
895fbaf2 1612 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP		 1613 yield = DEFER;
1614 goto SEND_QUIT;
1615 }
41c7c167
PH		 1616 }
1617
0756eb3c
PH		 1618/** Debugging without sending a message
1619addrlist->transport_return = DEFER;
1620goto SEND_QUIT;
1621**/
1622
1623 /* Errors that occur after this point follow an SMTP command, which is
1624 left in big_buffer by smtp_write_command() for use in error messages. */
1625
1626 smtp_command = big_buffer;
1627
1628 /* Tell the remote who we are...
1629
1630 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1631 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1632 greeting is of this form. The assumption was that the far end supports it
1633 properly... but experience shows that there are some that give 5xx responses,
1634 even though the banner includes "ESMTP" (there's a bloody-minded one that
1635 says "ESMTP not spoken here"). Cope with that case.
1636
1637 September 2000: Time has passed, and it seems reasonable now to always send
1638 EHLO at the start. It is also convenient to make the change while installing
1639 the TLS stuff.
1640
1641 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1642 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1643 would be no way to send out the mails, so there is now a host list
1644 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1645 PIPELINING problem as well. Maybe it can also be useful to cure other
1646 problems with broken servers.
1647
1648 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1649 Then somebody tried it with a Microsoft mailer... It seems that all other
1650 mailers use upper case for some reason (the RFC is quite clear about case
1651 independence) so, for peace of mind, I gave in. */
1652
5130845b 1653 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1654
061b7ebd
PP		 1655 /* Alas; be careful, since this goto is not an error-out, so conceivably
1656 we might set data between here and the target which we assume to exist
1657 and be usable. I can see this coming back to bite us. */
a7538db1 1658#ifdef SUPPORT_TLS
061b7ebd
PP		 1659 if (smtps)
1660 {
1661 tls_offered = TRUE;
1662 suppress_tls = FALSE;
1663 ob->tls_tempfail_tryclear = FALSE;
1664 smtp_command = US"SSL-on-connect";
1665 goto TLS_NEGOTIATE;
1666 }
a7538db1 1667#endif
061b7ebd 1668
0756eb3c
PH		 1669 if (esmtp)
1670 {
1671 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1672 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1673 goto SEND_FAILED;
1674 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1675 ob->command_timeout))
1676 {
895fbaf2
JH		 1677 if (errno != 0 || buffer[0] == 0 || lmtp)
1678 {
1679#ifdef EXPERIMENTAL_DSN_INFO
1680 helo_response = string_copy(buffer);
1681#endif
1682 goto RESPONSE_FAILED;
1683 }
0756eb3c
PH		 1684 esmtp = FALSE;
1685 }
895fbaf2
JH		 1686#ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688#endif
0756eb3c
PH		 1689 }
1690 else
1691 {
1692 DEBUG(D_transport)
1693 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1694 }
1695
1696 if (!esmtp)
1697 {
895fbaf2
JH		 1698 BOOL good_response;
1699
0756eb3c
PH		 1700 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1701 goto SEND_FAILED;
895fbaf2
JH		 1702 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1703 '2', ob->command_timeout);
1704#ifdef EXPERIMENTAL_DSN_INFO
1705 helo_response = string_copy(buffer);
1706#endif
1707 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1708 }
1709
9094b84b
JH		 1710 if (esmtp || lmtp)
1711 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1712 PEER_OFFERED_TLS
1713 | 0 /* IGNQ checked later */
1714 | 0 /* PRDR checked later */
1715 | 0 /* UTF8 checked later */
1716 | 0 /* DSN checked later */
1717 | 0 /* PIPE checked later */
1718 | 0 /* SIZE checked later */
1719 );
f1513293 1720
0756eb3c
PH		 1721 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1722
a7538db1 1723#ifdef SUPPORT_TLS
9094b84b 1724 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
7ade712c 1725#endif
0756eb3c
PH		 1726 }
1727
1728/* For continuing deliveries down the same channel, the socket is the standard
1729input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1730below). Set up the pointer to where subsequent commands will be left, for
1731error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1732set from the command line if they were set in the process that passed the
1733connection on. */
1734
895fbaf2
JH		 1735/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1736as the contine goes via transport_pass_socket() and doublefork and exec.
1737It does not wait. Unclear how we keep separate host's responses
1738separate - we could match up by host ip+port as a bodge. */
1739
0756eb3c
PH		 1740else
1741 {
1742 inblock.sock = outblock.sock = fileno(stdin);
1743 smtp_command = big_buffer;
4311097e 1744 host->port = port; /* Record the port that was used */
0756eb3c
PH		 1745 }
1746
1747/* If TLS is available on this connection, whether continued or not, attempt to
1748start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1749send another EHLO - the server may give a different answer in secure mode. We
1750use a separate buffer for reading the response to STARTTLS so that if it is
1751negative, the original EHLO data is available for subsequent analysis, should
1752the client not be required to use TLS. If the response is bad, copy the buffer
1753for error analysis. */
1754
1755#ifdef SUPPORT_TLS
5130845b
JH		 1756if ( tls_offered
1757 && !suppress_tls
1758 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH		 1759 {
1760 uschar buffer2[4096];
1761 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1762 goto SEND_FAILED;
1763
1764 /* If there is an I/O error, transmission of this message is deferred. If
1765 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1766 false, we also defer. However, if there is a temporary rejection of STARTTLS
1767 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1768 STARTTLS, we carry on. This means we will try to send the message in clear,
1769 unless the host is in hosts_require_tls (tested below). */
1770
1771 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1772 ob->command_timeout))
1773 {
4b0fe319
JH		 1774 if ( errno != 0
1775 || buffer2[0] == 0
1776 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1777 )
0dda4340
TK		 1778 {
1779 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1780 goto RESPONSE_FAILED;
0dda4340 1781 }
0756eb3c
PH		 1782 }
1783
1784 /* STARTTLS accepted: try to negotiate a TLS session. */
1785
1786 else
061b7ebd 1787 TLS_NEGOTIATE:
0756eb3c 1788 {
0e66b3b6
JH		 1789 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1790# ifdef EXPERIMENTAL_DANE
1791 , dane ? &tlsa_dnsa : NULL
1792# endif
1793 );
0756eb3c
PH		 1794
1795 /* TLS negotiation failed; give an error. From outside, this function may
1796 be called again to try in clear on a new connection, if the options permit
1797 it for this host. */
1798
1799 if (rc != OK)
1800 {
6ebd79ec 1801# ifdef EXPERIMENTAL_DANE
4b0fe319 1802 if (rc == DEFER && dane)
6ebd79ec 1803 {
4b0fe319
JH		 1804 log_write(0, LOG_MAIN,
1805 "DANE attempt failed; no TLS connection to %s [%s]",
6ebd79ec 1806 host->name, host->address);
6ebd79ec
JH		 1807 }
1808# endif
1809
0756eb3c
PH		 1810 save_errno = ERRNO_TLSFAILURE;
1811 message = US"failure while setting up TLS session";
1812 send_quit = FALSE;
1813 goto TLS_FAILED;
1814 }
1815
1816 /* TLS session is set up */
1817
895fbaf2 1818 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH		 1819 if (addr->transport_return == PENDING_DEFER)
1820 {
817d9f57 1821 addr->cipher = tls_out.cipher;
9d1c15ef
JH		 1822 addr->ourcert = tls_out.ourcert;
1823 addr->peercert = tls_out.peercert;
817d9f57 1824 addr->peerdn = tls_out.peerdn;
018058b2 1825 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1826 }
0756eb3c
PH		 1827 }
1828 }
1829
061b7ebd
PP		 1830/* if smtps, we'll have smtp_command set to something else; always safe to
1831reset it here. */
1832smtp_command = big_buffer;
1833
41c7c167
PH		 1834/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1835helo_data is null, we are dealing with a connection that was passed from
1836another process, and so we won't have expanded helo_data above. We have to
1837expand it here. $sending_ip_address and $sending_port are set up right at the
1838start of the Exim process (in exim.c). */
0756eb3c 1839
817d9f57 1840if (tls_out.active >= 0)
0756eb3c 1841 {
061b7ebd 1842 char *greeting_cmd;
895fbaf2
JH		 1843 BOOL good_response;
1844
41c7c167
PH		 1845 if (helo_data == NULL)
1846 {
1847 helo_data = expand_string(ob->helo_data);
1848 if (helo_data == NULL)
1849 {
1850 uschar *message = string_sprintf("failed to expand helo_data: %s",
1851 expand_string_message);
895fbaf2 1852 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH		 1853 yield = DEFER;
1854 goto SEND_QUIT;
1855 }
1856 }
1857
0d0e4455 1858 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP		 1859 if (smtps)
1860 {
895fbaf2
JH		 1861 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1862 '2', ob->command_timeout);
1863#ifdef EXPERIMENTAL_DSN_INFO
1864 smtp_greeting = string_copy(buffer);
1865#endif
1866 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP		 1867 }
1868
1869 if (esmtp)
1870 greeting_cmd = "EHLO";
1871 else
1872 {
1873 greeting_cmd = "HELO";
1874 DEBUG(D_transport)
1875 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP		 1876 }
1877
1878 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1879 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1880 goto SEND_FAILED;
895fbaf2
JH		 1881 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1882 '2', ob->command_timeout);
1883#ifdef EXPERIMENTAL_DSN_INFO
1884 helo_response = string_copy(buffer);
1885#endif
1886 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1887 }
1888
1889/* If the host is required to use a secure channel, ensure that we
1890have one. */
1891
0e66b3b6
JH		 1892else if (
1893# ifdef EXPERIMENTAL_DANE
1894 dane ||
1895# endif
5130845b 1896 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1897 )
0756eb3c
PH		 1898 {
1899 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1900 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH		 1901 tls_offered? "an attempt to start TLS failed" :
1902 "the server did not offer TLS support");
1903 goto TLS_FAILED;
1904 }
0e66b3b6 1905#endif /*SUPPORT_TLS*/
0756eb3c
PH		 1906
1907/* If TLS is active, we have just started it up and re-done the EHLO command,
1908so its response needs to be analyzed. If TLS is not active and this is a
1909continued session down a previously-used socket, we haven't just done EHLO, so
1910we skip this. */
1911
1912if (continue_hostname == NULL
a7538db1 1913#ifdef SUPPORT_TLS
817d9f57 1914 || tls_out.active >= 0
a7538db1 1915#endif
0756eb3c
PH		 1916 )
1917 {
9094b84b
JH		 1918 if (esmtp || lmtp)
1919 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1920 0 /* no TLS */
1921 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1922 | PEER_OFFERED_PRDR
1923#ifdef SUPPORT_I18N
1924 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1925 /*XXX if we hand peercaps on to continued-conn processes,
1926 must not depend on this addr */
1927#endif
1928 | PEER_OFFERED_DSN
1929 | PEER_OFFERED_PIPE
1930 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1931 );
1932
f1513293
PH		 1933 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1934 lmtp_ignore_quota option was set. */
1935
9094b84b 1936 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 1937
0756eb3c
PH		 1938 /* If the response to EHLO specified support for the SIZE parameter, note
1939 this, provided size_addition is non-negative. */
1940
9094b84b 1941 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
0756eb3c
PH		 1942
1943 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH		 1944 the current host, esmtp will be false, so PIPELINING can never be used. If
1945 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1946
9094b84b
JH		 1947 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1948 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
0756eb3c
PH		 1949
1950 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
9094b84b 1951 smtp_use_pipelining ? "" : "not ");
0756eb3c 1952
8ccd00b1 1953#ifndef DISABLE_PRDR
9094b84b
JH		 1954 if ( peer_offered & PEER_OFFERED_PRDR
1955 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1956 peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 1957
9094b84b 1958 if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH		 1959 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1960#endif
1961
6c1c3d1d 1962 /* Note if the server supports DSN */
9094b84b
JH		 1963 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1964 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
6c1c3d1d 1965
0756eb3c
PH		 1966 /* Note if the response to EHLO specifies support for the AUTH extension.
1967 If it has, check that this host is one we want to authenticate to, and do
1968 the business. The host name and address must be available when the
1969 authenticator's client driver is running. */
1970
fcc8e047
JH		 1971 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1972 ob, esmtp, &inblock, &outblock))
0756eb3c 1973 {
fcc8e047
JH		 1974 default: goto SEND_QUIT;
1975 case OK: break;
1976 case FAIL_SEND: goto SEND_FAILED;
1977 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH		 1978 }
1979 }
1980
1981/* The setting up of the SMTP call is now complete. Any subsequent errors are
1982message-specific. */
1983
1984setting_up = FALSE;
1985
8c5d388a 1986#ifdef SUPPORT_I18N
9094b84b
JH		 1987if (addrlist->prop.utf8_msg)
1988 {
1989 utf8_needed = !addrlist->prop.utf8_downcvt
1990 && !addrlist->prop.utf8_downcvt_maybe;
1991 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1992 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1993 }
1994
7ade712c 1995/* If this is an international message we need the host to speak SMTPUTF8 */
9094b84b 1996if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH		 1997 {
1998 errno = ERRNO_UTF8_FWD;
1999 goto RESPONSE_FAILED;
2000 }
2001#endif
2002
0756eb3c
PH		 2003/* If there is a filter command specified for this transport, we can now
2004set it up. This cannot be done until the identify of the host is known. */
2005
2006if (tblock->filter_command != NULL)
2007 {
2008 BOOL rc;
2009 uschar buffer[64];
2010 sprintf(CS buffer, "%.50s transport", tblock->name);
2011 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2012 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 2013 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH		 2014
2015 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2016 yield ERROR. */
2017
2018 if (!rc)
2019 {
895fbaf2
JH		 2020 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2021 FALSE);
0756eb3c
PH		 2022 yield = ERROR;
2023 goto SEND_QUIT;
2024 }
2025 }
2026
2027
2028/* For messages that have more than the maximum number of envelope recipients,
2029we want to send several transactions down the same SMTP connection. (See
2030comments in deliver.c as to how this reconciles, heuristically, with
2031remote_max_parallel.) This optimization was added to Exim after the following
2032code was already working. The simplest way to put it in without disturbing the
2033code was to use a goto to jump back to this point when there is another
2034transaction to handle. */
2035
2036SEND_MESSAGE:
2037sync_addr = first_addr;
2038address_count = 0;
2039ok = FALSE;
2040send_rset = TRUE;
2041completed_address = FALSE;
2042
2043
2044/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2045qualification, send it, adding something to the message size to allow for
2046imprecision and things that get added en route. Exim keeps the number of lines
2047in a message, so we can give an accurate value for the original message, but we
2048need some additional to handle added headers. (Double "." characters don't get
2049included in the count.) */
2050
2051p = buffer;
2052*p = 0;
2053
2054if (smtp_use_size)
2055 {
2056 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2057 while (*p) p++;
2058 }
2059
8ccd00b1 2060#ifndef DISABLE_PRDR
fd98a5c6 2061prdr_active = FALSE;
9094b84b 2062if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH		 2063 for (addr = first_addr; addr; addr = addr->next)
2064 if (addr->transport_return == PENDING_DEFER)
2065 {
2066 for (addr = addr->next; addr; addr = addr->next)
2067 if (addr->transport_return == PENDING_DEFER)
2068 { /* at least two recipients to send */
2069 prdr_active = TRUE;
2070 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2071 break;
fd98a5c6
JH		 2072 }
2073 break;
2074 }
fd98a5c6
JH		 2075#endif
2076
8c5d388a 2077#ifdef SUPPORT_I18N
9094b84b
JH		 2078if ( addrlist->prop.utf8_msg
2079 && !addrlist->prop.utf8_downcvt
2080 && peer_offered & PEER_OFFERED_UTF8
2081 )
7ade712c
JH		 2082 sprintf(CS p, " SMTPUTF8"), p += 9;
2083#endif
2084
6c1c3d1d
WB		 2085/* check if all addresses have lasthop flag */
2086/* do not send RET and ENVID if true */
7ade712c 2087for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB		 2088 address_count < max_rcpt && addr != NULL;
2089 addr = addr->next)
2090 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2091 {
6c1c3d1d 2092 dsn_all_lasthop = FALSE;
7ade712c
JH		 2093 break;
2094 }
6c1c3d1d
WB		 2095
2096/* Add any DSN flags to the mail command */
2097
7ade712c 2098if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB		 2099 {
2100 if (dsn_ret == dsn_ret_hdrs)
2101 {
45500060 2102 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB		 2103 while (*p) p++;
2104 }
2105 else if (dsn_ret == dsn_ret_full)
2106 {
45500060 2107 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB		 2108 while (*p) p++;
2109 }
2110 if (dsn_envid != NULL)
2111 {
2112 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2113 while (*p) p++;
2114 }
2115 }
6c1c3d1d 2116
6b62e899
JH		 2117/* If an authenticated_sender override has been specified for this transport
2118instance, expand it. If the expansion is forced to fail, and there was already
2119an authenticated_sender for this message, the original value will be used.
2120Other expansion failures are serious. An empty result is ignored, but there is
2121otherwise no check - this feature is expected to be used with LMTP and other
2122cases where non-standard addresses (e.g. without domains) might be required. */
2123
fcc8e047 2124if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH		 2125 {
2126 yield = ERROR;
2127 goto SEND_QUIT;
2128 }
0756eb3c
PH		 2129
2130/* From here until we send the DATA command, we can make use of PIPELINING
2131if the server host supports it. The code has to be able to check the responses
2132at any point, for when the buffer fills up, so we write it totally generally.
2133When PIPELINING is off, each command written reports that it has flushed the
2134buffer. */
2135
2136pending_MAIL = TRUE; /* The block starts with MAIL */
2137
3c8b3577
JH		 2138 {
2139 uschar * s = return_path;
8c5d388a 2140#ifdef SUPPORT_I18N
3c8b3577
JH		 2141 uschar * errstr = NULL;
2142
2143 /* If we must downconvert, do the from-address here. Remember we had to
2144 for the to-addresses (done below), and also (ugly) for re-doing when building
2145 the delivery log line. */
2146
9094b84b
JH		 2147 if ( addrlist->prop.utf8_msg
2148 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2149 )
3c8b3577
JH		 2150 {
2151 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2152 {
895fbaf2 2153 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH		 2154 yield = ERROR;
2155 goto SEND_QUIT;
2156 }
2157 setflag(addrlist, af_utf8_downcvt);
2158 }
2159#endif
2160
2161 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2162 "MAIL FROM:<%s>%s\r\n", s, buffer);
2163 }
2164
0756eb3c
PH		 2165mail_command = string_copy(big_buffer); /* Save for later error message */
2166
2167switch(rc)
2168 {
2169 case -1: /* Transmission error */
7ade712c 2170 goto SEND_FAILED;
0756eb3c
PH		 2171
2172 case +1: /* Block was sent */
7ade712c 2173 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2174 ob->command_timeout))
e97957bc 2175 {
7ade712c
JH		 2176 if (errno == 0 && buffer[0] == '4')
2177 {
2178 errno = ERRNO_MAIL4XX;
2179 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2180 }
2181 goto RESPONSE_FAILED;
e97957bc 2182 }
7ade712c
JH		 2183 pending_MAIL = FALSE;
2184 break;
0756eb3c
PH		 2185 }
2186
2187/* Pass over all the relevant recipient addresses for this host, which are the
2188ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2189several before we have to read the responses for those seen so far. This
2190checking is done by a subroutine because it also needs to be done at the end.
2191Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2192the next one if not all are sent.
2193
2194In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2195last address because we want to abort if any recipients have any kind of
2196problem, temporary or permanent. We know that all recipient addresses will have
2197the PENDING_DEFER status, because only one attempt is ever made, and we know
2198that max_rcpt will be large, so all addresses will be done at once. */
2199
2200for (addr = first_addr;
2201 address_count < max_rcpt && addr != NULL;
2202 addr = addr->next)
2203 {
2204 int count;
2205 BOOL no_flush;
3c8b3577 2206 uschar * rcpt_addr;
0756eb3c 2207
a7538db1 2208 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2209
0756eb3c
PH		 2210 if (addr->transport_return != PENDING_DEFER) continue;
2211
2212 address_count++;
2213 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2214
6c1c3d1d
WB		 2215 /* Add any DSN flags to the rcpt command and add to the sent string */
2216
2217 p = buffer;
2218 *p = 0;
2219
a7538db1 2220 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB		 2221 {
2222 if ((addr->dsn_flags & rf_dsnflags) != 0)
2223 {
2224 int i;
2225 BOOL first = TRUE;
45500060 2226 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB		 2227 while (*p) p++;
2228 for (i = 0; i < 4; i++)
6c1c3d1d
WB		 2229 if ((addr->dsn_flags & rf_list[i]) != 0)
2230 {
2231 if (!first) *p++ = ',';
2232 first = FALSE;
45500060 2233 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB		 2234 while (*p) p++;
2235 }
6c1c3d1d
WB		 2236 }
2237
a7538db1
JH		 2238 if (addr->dsn_orcpt != NULL)
2239 {
6c1c3d1d
WB		 2240 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2241 addr->dsn_orcpt);
2242 while (*p) p++;
2243 }
2244 }
6c1c3d1d 2245
0756eb3c
PH		 2246 /* Now send the RCPT command, and process outstanding responses when
2247 necessary. After a timeout on RCPT, we just end the function, leaving the
2248 yield as OK, because this error can often mean that there is a problem with
2249 just one address, so we don't want to delay the host. */
2250
3c8b3577
JH		 2251 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2252
8c5d388a 2253#ifdef SUPPORT_I18N
3c8b3577
JH		 2254 {
2255 uschar * dummy_errstr;
2256 if ( testflag(addrlist, af_utf8_downcvt)
2257 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2258 dummy_errstr
2259 ) )
2260 {
2261 errno = ERRNO_EXPANDFAIL;
2262 goto SEND_FAILED;
2263 }
2264 }
2265#endif
2266
6c1c3d1d 2267 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2268 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2269
0756eb3c
PH		 2270 if (count < 0) goto SEND_FAILED;
2271 if (count > 0)
2272 {
2273 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH		 2274 &sync_addr, host, count, ob->address_retry_include_sender,
2275 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2276 sizeof(buffer)))
0756eb3c
PH		 2277 {
2278 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2279 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2280 break;
2281
2282 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2283 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2284 case 0: /* No 2xx or 5xx, but no probs */
2285 break;
2286
2287 case -1: goto END_OFF; /* Timeout on RCPT */
2288 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2289 }
2290 pending_MAIL = FALSE; /* Dealt with MAIL */
2291 }
2292 } /* Loop for next address */
2293
2294/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2295permanently or temporarily. We should have flushed and synced after the last
2296RCPT. */
2297
2298if (mua_wrapper)
2299 {
2300 address_item *badaddr;
168dec3b
JH		 2301 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2302 if (badaddr->transport_return != PENDING_OK)
2303 {
2304 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH		 2305 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2306 testflag(badaddr, af_pass_message));
168dec3b
JH		 2307 ok = FALSE;
2308 break;
2309 }
0756eb3c
PH		 2310 }
2311
2312/* If ok is TRUE, we know we have got at least one good recipient, and must now
2313send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2314have a good recipient buffered up if we are pipelining. We don't want to waste
2315time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2316are pipelining. The responses are all handled by sync_responses(). */
2317
2318if (ok || (smtp_use_pipelining && !mua_wrapper))
2319 {
2320 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2321 if (count < 0) goto SEND_FAILED;
2322 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH		 2323 host, count, ob->address_retry_include_sender, pending_MAIL,
2324 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH		 2325 {
2326 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2327 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2328 break;
2329
2330 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2331 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2332 case 0: break; /* No 2xx or 5xx, but no probs */
2333
2334 case -1: goto END_OFF; /* Timeout on RCPT */
2335 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2336 }
2337 }
2338
2339/* Save the first address of the next batch. */
2340
2341first_addr = addr;
2342
2343/* If there were no good recipients (but otherwise there have been no
2344problems), just set ok TRUE, since we have handled address-specific errors
2345already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2346for handling the SMTP dot-handling protocol, flagging to apply to headers as
2347well as body. Set the appropriate timeout value to be used for each chunk.
2348(Haven't been able to make it work using select() for writing yet.) */
2349
2350if (!ok) ok = TRUE; else
2351 {
2352 sigalrm_seen = FALSE;
2353 transport_write_timeout = ob->data_timeout;
2354 smtp_command = US"sending data block"; /* For error messages */
2355 DEBUG(D_transport|D_v)
2356 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2357 transport_count = 0;
a7538db1 2358
80a47a2c 2359#ifndef DISABLE_DKIM
4cd12fe9
TK		 2360 ok = dkim_transport_write_message(addrlist, inblock.sock,
2361 topt_use_crlf | topt_end_dot | topt_escape_headers |
2362 (tblock->body_only? topt_no_headers : 0) |
2363 (tblock->headers_only? topt_no_body : 0) |
2364 (tblock->return_path_add? topt_add_return_path : 0) |
2365 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2366 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2367 0, /* No size limit */
2368 tblock->add_headers, tblock->remove_headers,
2369 US".", US"..", /* Escaping strings */
2370 tblock->rewrite_rules, tblock->rewrite_existflags,
2371 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2372 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK		 2373 );
2374#else
0756eb3c
PH		 2375 ok = transport_write_message(addrlist, inblock.sock,
2376 topt_use_crlf | topt_end_dot | topt_escape_headers |
2377 (tblock->body_only? topt_no_headers : 0) |
2378 (tblock->headers_only? topt_no_body : 0) |
2379 (tblock->return_path_add? topt_add_return_path : 0) |
2380 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2381 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2382 0, /* No size limit */
2383 tblock->add_headers, tblock->remove_headers,
2384 US".", US"..", /* Escaping strings */
2385 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2386#endif
0756eb3c
PH		 2387
2388 /* transport_write_message() uses write() because it is called from other
2389 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2390 it can exit with "Broken pipe" as its error. This really means that the
2391 socket got closed at the far end. */
2392
2393 transport_write_timeout = 0; /* for subsequent transports */
2394
2395 /* Failure can either be some kind of I/O disaster (including timeout),
2396 or the failure of a transport filter or the expansion of added headers. */
2397
2398 if (!ok)
2399 {
2400 buffer[0] = 0; /* There hasn't been a response */
2401 goto RESPONSE_FAILED;
2402 }
2403
2404 /* We used to send the terminating "." explicitly here, but because of
2405 buffering effects at both ends of TCP/IP connections, you don't gain
2406 anything by keeping it separate, so it might as well go in the final
2407 data buffer for efficiency. This is now done by setting the topt_end_dot
2408 flag above. */
2409
2410 smtp_command = US"end of data";
2411
8ccd00b1 2412#ifndef DISABLE_PRDR
fd98a5c6
JH		 2413 /* For PRDR we optionally get a partial-responses warning
2414 * followed by the individual responses, before going on with
2415 * the overall response. If we don't get the warning then deal
2416 * with per non-PRDR. */
2417 if(prdr_active)
2418 {
2419 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2420 ob->final_timeout);
2421 if (!ok && errno == 0)
2422 switch(buffer[0])
2423 {
2424 case '2': prdr_active = FALSE;
2425 ok = TRUE;
2426 break;
2427 case '4': errno = ERRNO_DATA4XX;
2428 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2429 break;
2430 }
2431 }
2432 else
2433#endif
2434
2435 /* For non-PRDR SMTP, we now read a single response that applies to the
2436 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2437
e97957bc
PH		 2438 if (!lmtp)
2439 {
2440 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2441 ob->final_timeout);
2442 if (!ok && errno == 0 && buffer[0] == '4')
2443 {
2444 errno = ERRNO_DATA4XX;
2445 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2446 }
2447 }
0756eb3c
PH		 2448
2449 /* For LMTP, we get back a response for every RCPT command that we sent;
2450 some may be accepted and some rejected. For those that get a response, their
2451 status is fixed; any that are accepted have been handed over, even if later
2452 responses crash - at least, that's how I read RFC 2033.
2453
2454 If all went well, mark the recipient addresses as completed, record which
2455 host/IPaddress they were delivered to, and cut out RSET when sending another
2456 message down the same channel. Write the completed addresses to the journal
2457 now so that they are recorded in case there is a crash of hardware or
2458 software before the spool gets updated. Also record the final SMTP
2459 confirmation if needed (for SMTP only). */
2460
2461 if (ok)
2462 {
2463 int flag = '=';
2464 int delivery_time = (int)(time(NULL) - start_delivery_time);
2465 int len;
0756eb3c
PH		 2466 uschar *conf = NULL;
2467 send_rset = FALSE;
2468
0756eb3c
PH		 2469 /* Set up confirmation if needed - applies only to SMTP */
2470
d68218c7 2471 if (
0cbf2b82 2472#ifdef DISABLE_EVENT
6c6d6e48 2473 LOGGING(smtp_confirmation) &&
a7538db1 2474#endif
d68218c7
JH		 2475 !lmtp
2476 )
0756eb3c 2477 {
55414b25
JH		 2478 const uschar *s = string_printing(buffer);
2479 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2480 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH		 2481 }
2482
fd98a5c6 2483 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH		 2484 each one. */
2485
2486 for (addr = addrlist; addr != first_addr; addr = addr->next)
2487 {
2488 if (addr->transport_return != PENDING_OK) continue;
2489
2490 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2491 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH		 2492 address. For temporary errors, add a retry item for the address so that
2493 it doesn't get tried again too soon. */
0756eb3c 2494
8ccd00b1 2495#ifndef DISABLE_PRDR
fd98a5c6
JH		 2496 if (lmtp || prdr_active)
2497#else
0756eb3c 2498 if (lmtp)
fd98a5c6 2499#endif
0756eb3c
PH		 2500 {
2501 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2502 ob->final_timeout))
2503 {
2504 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2505 addr->message = string_sprintf(
8ccd00b1 2506#ifndef DISABLE_PRDR
fd98a5c6
JH		 2507 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2508#else
2509 "LMTP error after %s: %s",
2510#endif
0756eb3c 2511 big_buffer, string_printing(buffer));
75def545
PH		 2512 setflag(addr, af_pass_message); /* Allow message to go to user */
2513 if (buffer[0] == '5')
2514 addr->transport_return = FAIL;
2515 else
2516 {
e97957bc
PH		 2517 errno = ERRNO_DATA4XX;
2518 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2519 addr->transport_return = DEFER;
8ccd00b1 2520#ifndef DISABLE_PRDR
fd98a5c6
JH		 2521 if (!prdr_active)
2522#endif
2523 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2524 }
0756eb3c
PH		 2525 continue;
2526 }
2527 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2528 if (LOGGING(smtp_confirmation))
c0ea85ab 2529 {
55414b25
JH		 2530 const uschar *s = string_printing(buffer);
2531 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2532 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2533 }
0756eb3c
PH		 2534 }
2535
2536 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2537 actual host that was used. */
0756eb3c
PH		 2538
2539 addr->transport_return = OK;
2540 addr->more_errno = delivery_time;
d427a7f9 2541 addr->host_used = host;
0756eb3c
PH		 2542 addr->special_action = flag;
2543 addr->message = conf;
8ccd00b1 2544#ifndef DISABLE_PRDR
fd98a5c6
JH		 2545 if (prdr_active) addr->flags |= af_prdr_used;
2546#endif
0756eb3c
PH		 2547 flag = '-';
2548
8ccd00b1 2549#ifndef DISABLE_PRDR
fd98a5c6
JH		 2550 if (!prdr_active)
2551#endif
2552 {
2553 /* Update the journal. For homonymic addresses, use the base address plus
2554 the transport name. See lots of comments in deliver.c about the reasons
2555 for the complications when homonyms are involved. Just carry on after
2556 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2557
fd98a5c6
JH		 2558 if (testflag(addr, af_homonym))
2559 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2560 else
2561 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2562
895fbaf2 2563 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH		 2564 len = Ustrlen(CS buffer);
2565 if (write(journal_fd, buffer, len) != len)
2566 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2567 "%s: %s", buffer, strerror(errno));
2568 }
0756eb3c
PH		 2569 }
2570
8ccd00b1 2571#ifndef DISABLE_PRDR
fd98a5c6
JH		 2572 if (prdr_active)
2573 {
2574 /* PRDR - get the final, overall response. For any non-success
2575 upgrade all the address statuses. */
2576 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2577 ob->final_timeout);
2578 if (!ok)
2579 {
2580 if(errno == 0 && buffer[0] == '4')
2581 {
2582 errno = ERRNO_DATA4XX;
2583 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2584 }
2585 for (addr = addrlist; addr != first_addr; addr = addr->next)
2586 if (buffer[0] == '5' || addr->transport_return == OK)
2587 addr->transport_return = PENDING_OK; /* allow set_errno action */
2588 goto RESPONSE_FAILED;
2589 }
2590
2591 /* Update the journal, or setup retry. */
2592 for (addr = addrlist; addr != first_addr; addr = addr->next)
2593 if (addr->transport_return == OK)
2594 {
2595 if (testflag(addr, af_homonym))
2596 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2597 else
2598 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2599
895fbaf2 2600 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH		 2601 len = Ustrlen(CS buffer);
2602 if (write(journal_fd, buffer, len) != len)
2603 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2604 "%s: %s", buffer, strerror(errno));
2605 }
2606 else if (addr->transport_return == DEFER)
2607 retry_add_item(addr, addr->address_retry_key, -2);
2608 }
2609#endif
2610
0756eb3c
PH		 2611 /* Ensure the journal file is pushed out to disk. */
2612
54fc8428 2613 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH		 2614 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2615 strerror(errno));
2616 }
2617 }
2618
2619
2620/* Handle general (not specific to one address) failures here. The value of ok
2621is used to skip over this code on the falling through case. A timeout causes a
2622deferral. Other errors may defer or fail according to the response code, and
2623may set up a special errno value, e.g. after connection chopped, which is
2624assumed if errno == 0 and there is no text in the buffer. If control reaches
2625here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2626the problem is not related to this specific message. */
2627
2628if (!ok)
2629 {
895fbaf2
JH		 2630 int code, set_rc;
2631 uschar * set_message;
0756eb3c
PH		 2632
2633 RESPONSE_FAILED:
895fbaf2
JH		 2634 {
2635 save_errno = errno;
2636 message = NULL;
2637 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2638 buffer, &code, &message, &pass_message);
2639 goto FAILED;
2640 }
0756eb3c
PH		 2641
2642 SEND_FAILED:
895fbaf2
JH		 2643 {
2644 save_errno = errno;
2645 code = '4';
2646 message = US string_sprintf("send() to %s [%s] failed: %s",
2647 host->name, host->address, strerror(save_errno));
2648 send_quit = FALSE;
2649 goto FAILED;
2650 }
0756eb3c
PH		 2651
2652 /* This label is jumped to directly when a TLS negotiation has failed,
2653 or was not done for a host for which it is required. Values will be set
2654 in message and save_errno, and setting_up will always be true. Treat as
2655 a temporary error. */
2656
a7538db1 2657#ifdef SUPPORT_TLS
0756eb3c
PH		 2658 TLS_FAILED:
2659 code = '4';
a7538db1 2660#endif
0756eb3c
PH		 2661
2662 /* If the failure happened while setting up the call, see if the failure was
2663 a 5xx response (this will either be on connection, or following HELO - a 5xx
2664 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2665 never going to accept them. For other errors during setting up (timeouts or
2666 whatever), defer all addresses, and yield DEFER, so that the host is not
2667 tried again for a while. */
2668
2669 FAILED:
2670 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2671 set_message = message;
0756eb3c
PH		 2672
2673 if (setting_up)
2674 {
2675 if (code == '5')
895fbaf2 2676 set_rc = FAIL;
0756eb3c 2677 else
895fbaf2 2678 yield = set_rc = DEFER;
0756eb3c
PH		 2679 }
2680
e97957bc 2681 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2682 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH		 2683 the contents of the message rather than a real error on the connection. These
2684 cases are treated in the same way as a 4xx response. This next bit of code
2685 does the classification. */
0756eb3c 2686
e97957bc 2687 else
0756eb3c 2688 {
e97957bc 2689 BOOL message_error;
0756eb3c 2690
e97957bc
PH		 2691 switch(save_errno)
2692 {
8c5d388a 2693#ifdef SUPPORT_I18N
250b6871
JH		 2694 case ERRNO_UTF8_FWD:
2695 code = '5';
2696 /*FALLTHROUGH*/
2697#endif
e97957bc
PH		 2698 case 0:
2699 case ERRNO_MAIL4XX:
2700 case ERRNO_DATA4XX:
250b6871
JH		 2701 message_error = TRUE;
2702 break;
0756eb3c 2703
e97957bc 2704 case ETIMEDOUT:
250b6871
JH		 2705 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2706 Ustrncmp(smtp_command,"end ",4) == 0;
2707 break;
e97957bc
PH		 2708
2709 case ERRNO_SMTPCLOSED:
250b6871
JH		 2710 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2711 break;
e97957bc
PH		 2712
2713 default:
250b6871
JH		 2714 message_error = FALSE;
2715 break;
e97957bc 2716 }
0756eb3c 2717
e97957bc 2718 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2719
e97957bc
PH		 2720 (a) negative response or timeout after MAIL
2721 (b) negative response after DATA
2722 (c) negative response or timeout or dropped connection after "."
250b6871 2723 (d) utf8 support required and not offered
0756eb3c 2724
e97957bc
PH		 2725 It won't be a negative response or timeout after RCPT, as that is dealt
2726 with separately above. The action in all cases is to set an appropriate
2727 error code for all the addresses, but to leave yield set to OK because the
2728 host itself has not failed. Of course, it might in practice have failed
2729 when we've had a timeout, but if so, we'll discover that at the next
2730 delivery attempt. For a temporary error, set the message_defer flag, and
2731 write to the logs for information if this is not the last host. The error
2732 for the last host will be logged as part of the address's log line. */
2733
2734 if (message_error)
0756eb3c 2735 {
e97957bc 2736 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH		 2737
2738 /* If there's an errno, the message contains just the identity of
2739 the host. */
2740
895fbaf2
JH		 2741 if (code == '5')
2742 set_rc = FAIL;
2743 else /* Anything other than 5 is treated as temporary */
e97957bc 2744 {
895fbaf2 2745 set_rc = DEFER;
e97957bc
PH		 2746 if (save_errno > 0)
2747 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2748 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2749 msglog_line(host, message);
e97957bc
PH		 2750 *message_defer = TRUE;
2751 }
2752 }
2753
2754 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2755 ".", or some other transportation error. We defer all addresses and yield
2756 DEFER, except for the case of failed add_headers expansion, or a transport
2757 filter failure, when the yield should be ERROR, to stop it trying other
2758 hosts. */
2759
2760 else
2761 {
895fbaf2 2762 set_rc = DEFER;
e97957bc
PH		 2763 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2764 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH		 2765 }
2766 }
895fbaf2
JH		 2767
2768 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2769#ifdef EXPERIMENTAL_DSN_INFO
2770 , smtp_greeting, helo_response
2771#endif
2772 );
0756eb3c
PH		 2773 }
2774
2775
2776/* If all has gone well, send_quit will be set TRUE, implying we can end the
2777SMTP session tidily. However, if there were too many addresses to send in one
2778message (indicated by first_addr being non-NULL) we want to carry on with the
2779rest of them. Also, it is desirable to send more than one message down the SMTP
2780connection if there are several waiting, provided we haven't already sent so
2781many as to hit the configured limit. The function transport_check_waiting looks
2782for a waiting message and returns its id. Then transport_pass_socket tries to
2783set up a continued delivery by passing the socket on to another process. The
2784variable send_rset is FALSE if a message has just been successfully transfered.
2785
2786If we are already sending down a continued channel, there may be further
2787addresses not yet delivered that are aimed at the same host, but which have not
2788been passed in this run of the transport. In this case, continue_more will be
2789true, and all we should do is send RSET if necessary, and return, leaving the
2790channel open.
2791
2792However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2793do not want to continue with other messages down the same channel, because that
2794can lead to looping between two or more messages, all with the same,
2795temporarily failing address(es). [The retry information isn't updated yet, so
2796new processes keep on trying.] We probably also don't want to try more of this
2797message's addresses either.
2798
2799If we have started a TLS session, we have to end it before passing the
2800connection to a new process. However, not all servers can handle this (Exim
2801can), so we do not pass such a connection on if the host matches
2802hosts_nopass_tls. */
2803
2804DEBUG(D_transport)
2805 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2806 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2807 continue_more, yield, (first_addr == NULL)? "":"not ");
2808
2809if (completed_address && ok && send_quit)
2810 {
2811 BOOL more;
a39bd74d
JB		 2812 smtp_compare_t t_compare;
2813
2814 t_compare.tblock = tblock;
2815 t_compare.current_sender_address = sender_address;
2816
5130845b
JH		 2817 if ( first_addr != NULL
2818 || continue_more
2819 || ( ( tls_out.active < 0
2820 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2821 )
0756eb3c
PH		 2822 &&
2823 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB		 2824 tblock->connection_max_messages, new_message_id, &more,
2825 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2826 ) )
0756eb3c
PH		 2827 {
2828 uschar *msg;
447d236c 2829 BOOL pass_message;
0756eb3c
PH		 2830
2831 if (send_rset)
2832 {
2833 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2834 {
2835 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2836 host->address, strerror(save_errno));
2837 send_quit = FALSE;
2838 }
2839 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2840 ob->command_timeout)))
2841 {
2842 int code;
447d236c
PH		 2843 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2844 &pass_message);
0756eb3c
PH		 2845 if (!send_quit)
2846 {
c562fd30
JH		 2847 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2848 host->name, host->address, msg);
0756eb3c
PH		 2849 }
2850 }
2851 }
2852
2853 /* Either RSET was not needed, or it succeeded */
2854
2855 if (ok)
2856 {
2857 if (first_addr != NULL) /* More addresses still to be sent */
2858 { /* in this run of the transport */
2859 continue_sequence++; /* Causes * in logging */
2860 goto SEND_MESSAGE;
2861 }
2862 if (continue_more) return yield; /* More addresses for another run */
2863
2864 /* Pass the socket to a new Exim process. Before doing so, we must shut
2865 down TLS. Not all MTAs allow for the continuation of the SMTP session
2866 when TLS is shut down. We test for this by sending a new EHLO. If we
2867 don't get a good response, we don't attempt to pass the socket on. */
2868
a7538db1 2869#ifdef SUPPORT_TLS
817d9f57 2870 if (tls_out.active >= 0)
0756eb3c 2871 {
817d9f57 2872 tls_close(FALSE, TRUE);
061b7ebd
PP		 2873 if (smtps)
2874 ok = FALSE;
2875 else
2876 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2877 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2878 ob->command_timeout);
0756eb3c 2879 }
a7538db1 2880#endif
0756eb3c
PH		 2881
2882 /* If the socket is successfully passed, we musn't send QUIT (or
2883 indeed anything!) from here. */
2884
895fbaf2
JH		 2885/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2886propagate it from the initial
2887*/
0756eb3c
PH		 2888 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2889 new_message_id, inblock.sock))
2890 {
2891 send_quit = FALSE;
2892 }
2893 }
2894
2895 /* If RSET failed and there are addresses left, they get deferred. */
2896
895fbaf2
JH		 2897 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2898#ifdef EXPERIMENTAL_DSN_INFO
2899 , smtp_greeting, helo_response
2900#endif
2901 );
0756eb3c
PH		 2902 }
2903 }
2904
2905/* End off tidily with QUIT unless the connection has died or the socket has
2906been passed to another process. There has been discussion on the net about what
2907to do after sending QUIT. The wording of the RFC suggests that it is necessary
2908to wait for a response, but on the other hand, there isn't anything one can do
2909with an error response, other than log it. Exim used to do that. However,
2910further discussion suggested that it is positively advantageous not to wait for
2911the response, but to close the session immediately. This is supposed to move
2912the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2913load from the server. (Hosts that are both servers and clients may not see much
2914difference, of course.) Further discussion indicated that this was safe to do
2915on Unix systems which have decent implementations of TCP/IP that leave the
2916connection around for a while (TIME_WAIT) after the application has gone away.
2917This enables the response sent by the server to be properly ACKed rather than
2918timed out, as can happen on broken TCP/IP implementations on other OS.
2919
2920This change is being made on 31-Jul-98. After over a year of trouble-free
2921operation, the old commented-out code was removed on 17-Sep-99. */
2922
2923SEND_QUIT:
2924if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2925
2926END_OFF:
2927
2928#ifdef SUPPORT_TLS
817d9f57 2929tls_close(FALSE, TRUE);
0756eb3c
PH		 2930#endif
2931
2932/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH		 2933works because the NULL setting is passed back to the calling process, and
2934remote_max_parallel is forced to 1 when delivering over an existing connection,
2935
2936If all went well and continue_more is set, we shouldn't actually get here if
2937there are further addresses, as the return above will be taken. However,
2938writing RSET might have failed, or there may be other addresses whose hosts are
2939specified in the transports, and therefore not visible at top level, in which
2940case continue_more won't get set. */
2941
b9d9c5a2 2942HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
f1e894f3 2943(void)close(inblock.sock);
a7538db1 2944
0cbf2b82 2945#ifndef DISABLE_EVENT
774ef2d7 2946(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH		 2947#endif
2948
0756eb3c
PH		 2949continue_transport = NULL;
2950continue_hostname = NULL;
2951return yield;
2952}
2953
2954
2955
2956
2957/*************************************************
2958* Closedown entry point *
2959*************************************************/
2960
2961/* This function is called when exim is passed an open smtp channel
2962from another incarnation, but the message which it has been asked
2963to deliver no longer exists. The channel is on stdin.
2964
2965We might do fancy things like looking for another message to send down
2966the channel, but if the one we sought has gone, it has probably been
2967delivered by some other process that itself will seek further messages,
2968so just close down our connection.
2969
2970Argument: pointer to the transport instance block
2971Returns: nothing
2972*/
2973
2974void
2975smtp_transport_closedown(transport_instance *tblock)
2976{
2977smtp_transport_options_block *ob =
2978 (smtp_transport_options_block *)(tblock->options_block);
2979smtp_inblock inblock;
2980smtp_outblock outblock;
2981uschar buffer[256];
2982uschar inbuffer[4096];
2983uschar outbuffer[16];
2984
2985inblock.sock = fileno(stdin);
2986inblock.buffer = inbuffer;
2987inblock.buffersize = sizeof(inbuffer);
2988inblock.ptr = inbuffer;
2989inblock.ptrend = inbuffer;
2990
2991outblock.sock = inblock.sock;
2992outblock.buffersize = sizeof(outbuffer);
2993outblock.buffer = outbuffer;
2994outblock.ptr = outbuffer;
2995outblock.cmd_count = 0;
2996outblock.authenticating = FALSE;
2997
2998(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2999(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3000 ob->command_timeout);
f1e894f3 3001(void)close(inblock.sock);
0756eb3c
PH		 3002}
3003
3004
3005
3006/*************************************************
3007* Prepare addresses for delivery *
3008*************************************************/
3009
3010/* This function is called to flush out error settings from previous delivery
3011attempts to other hosts. It also records whether we got here via an MX record
3012or not in the more_errno field of the address. We are interested only in
3013addresses that are still marked DEFER - others may have got delivered to a
3014previously considered IP address. Set their status to PENDING_DEFER to indicate
3015which ones are relevant this time.
3016
3017Arguments:
3018 addrlist the list of addresses
3019 host the host we are delivering to
3020
3021Returns: the first address for this delivery
3022*/
3023
3024static address_item *
3025prepare_addresses(address_item *addrlist, host_item *host)
3026{
3027address_item *first_addr = NULL;
3028address_item *addr;
3029for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH		 3030 if (addr->transport_return == DEFER)
3031 {
3032 if (first_addr == NULL) first_addr = addr;
3033 addr->transport_return = PENDING_DEFER;
3034 addr->basic_errno = 0;
3035 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3036 addr->message = NULL;
a7538db1 3037#ifdef SUPPORT_TLS
168dec3b
JH		 3038 addr->cipher = NULL;
3039 addr->ourcert = NULL;
3040 addr->peercert = NULL;
3041 addr->peerdn = NULL;
3042 addr->ocsp = OCSP_NOT_REQ;
895fbaf2
JH		 3043#endif
3044#ifdef EXPERIMENTAL_DSN_INFO
3045 addr->smtp_greeting = NULL;
3046 addr->helo_response = NULL;
a7538db1 3047#endif
168dec3b 3048 }
0756eb3c
PH		 3049return first_addr;
3050}
3051
3052
3053
3054/*************************************************
3055* Main entry point *
3056*************************************************/
3057
3058/* See local README for interface details. As this is a remote transport, it is
3059given a chain of addresses to be delivered in one connection, if possible. It
3060always returns TRUE, indicating that each address has its own independent
3061status set, except if there is a setting up problem, in which case it returns
3062FALSE. */
3063
3064BOOL
3065smtp_transport_entry(
3066 transport_instance *tblock, /* data for this instantiation */
3067 address_item *addrlist) /* addresses we are working on */
3068{
3069int cutoff_retry;
3070int port;
3071int hosts_defer = 0;
3072int hosts_fail = 0;
3073int hosts_looked_up = 0;
3074int hosts_retry = 0;
3075int hosts_serial = 0;
3076int hosts_total = 0;
8e669ac1 3077int total_hosts_tried = 0;
0756eb3c
PH		 3078address_item *addr;
3079BOOL expired = TRUE;
3080BOOL continuing = continue_hostname != NULL;
3081uschar *expanded_hosts = NULL;
3082uschar *pistring;
3083uschar *tid = string_sprintf("%s transport", tblock->name);
3084smtp_transport_options_block *ob =
3085 (smtp_transport_options_block *)(tblock->options_block);
3086host_item *hostlist = addrlist->host_list;
3087host_item *host = NULL;
3088
3089DEBUG(D_transport)
3090 {
3091 debug_printf("%s transport entered\n", tblock->name);
3092 for (addr = addrlist; addr != NULL; addr = addr->next)
3093 debug_printf(" %s\n", addr->address);
3094 if (continuing) debug_printf("already connected to %s [%s]\n",
3095 continue_hostname, continue_host_address);
3096 }
3097
f6c332bd
PH		 3098/* Set the flag requesting that these hosts be added to the waiting
3099database if the delivery fails temporarily or if we are running with
3100queue_smtp or a 2-stage queue run. This gets unset for certain
3101kinds of error, typically those that are specific to the message. */
3102
3103update_waiting = TRUE;
3104
0756eb3c
PH		 3105/* If a host list is not defined for the addresses - they must all have the
3106same one in order to be passed to a single transport - or if the transport has
3107a host list with hosts_override set, use the host list supplied with the
3108transport. It is an error for this not to exist. */
3109
3110if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3111 {
3112 if (ob->hosts == NULL)
3113 {
3114 addrlist->message = string_sprintf("%s transport called with no hosts set",
3115 tblock->name);
3116 addrlist->transport_return = PANIC;
3117 return FALSE; /* Only top address has status */
3118 }
3119
3120 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3121 ob->hosts);
3122
3123 /* If the transport's host list contains no '$' characters, and we are not
3124 randomizing, it is fixed and therefore a chain of hosts can be built once
3125 and for all, and remembered for subsequent use by other calls to this
3126 transport. If, on the other hand, the host list does contain '$', or we are
3127 randomizing its order, we have to rebuild it each time. In the fixed case,
3128 as the hosts string will never be used again, it doesn't matter that we
3129 replace all the : characters with zeros. */
3130
3131 if (ob->hostlist == NULL)
3132 {
3133 uschar *s = ob->hosts;
3134
3135 if (Ustrchr(s, '$') != NULL)
3136 {
d427a7f9 3137 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH		 3138 {
3139 addrlist->message = string_sprintf("failed to expand list of hosts "
3140 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3141 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3142 return FALSE; /* Only top address has status */
3143 }
3144 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3145 "\"%s\"\n", s, expanded_hosts);
3146 s = expanded_hosts;
3147 }
3148 else
3149 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3150
3151 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3152
e276e04b
TF		 3153 /* Check that the expansion yielded something useful. */
3154 if (hostlist == NULL)
3155 {
3156 addrlist->message =
3157 string_sprintf("%s transport has empty hosts setting", tblock->name);
3158 addrlist->transport_return = PANIC;
3159 return FALSE; /* Only top address has status */
3160 }
3161
0756eb3c
PH		 3162 /* If there was no expansion of hosts, save the host list for
3163 next time. */
3164
d427a7f9 3165 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH		 3166 }
3167
3168 /* This is not the first time this transport has been run in this delivery;
3169 the host list was built previously. */
3170
55414b25
JH		 3171 else
3172 hostlist = ob->hostlist;
0756eb3c
PH		 3173 }
3174
3175/* The host list was supplied with the address. If hosts_randomize is set, we
3176must sort it into a random order if it did not come from MX records and has not
3177already been randomized (but don't bother if continuing down an existing
3178connection). */
3179
3180else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3181 {
3182 host_item *newlist = NULL;
3183 while (hostlist != NULL)
3184 {
3185 host_item *h = hostlist;
3186 hostlist = hostlist->next;
3187
3188 h->sort_key = random_number(100);
3189
3190 if (newlist == NULL)
3191 {
3192 h->next = NULL;
3193 newlist = h;
3194 }
3195 else if (h->sort_key < newlist->sort_key)
3196 {
3197 h->next = newlist;
3198 newlist = h;
3199 }
3200 else
3201 {
3202 host_item *hh = newlist;
3203 while (hh->next != NULL)
3204 {
3205 if (h->sort_key < hh->next->sort_key) break;
3206 hh = hh->next;
3207 }
3208 h->next = hh->next;
3209 hh->next = h;
3210 }
3211 }
3212
3213 hostlist = addrlist->host_list = newlist;
3214 }
3215
2d280592 3216/* Sort out the default port. */
0756eb3c
PH		 3217
3218if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3219
0756eb3c
PH		 3220/* For each host-plus-IP-address on the list:
3221
3222. If this is a continued delivery and the host isn't the one with the
3223 current connection, skip.
3224
3225. If the status is unusable (i.e. previously failed or retry checked), skip.
3226
3227. If no IP address set, get the address, either by turning the name into
3228 an address, calling gethostbyname if gethostbyname is on, or by calling
3229 the DNS. The DNS may yield multiple addresses, in which case insert the
3230 extra ones into the list.
3231
3232. Get the retry data if not previously obtained for this address and set the
3233 field which remembers the state of this address. Skip if the retry time is
3234 not reached. If not, remember whether retry data was found. The retry string
3235 contains both the name and the IP address.
3236
3237. Scan the list of addresses and mark those whose status is DEFER as
3238 PENDING_DEFER. These are the only ones that will be processed in this cycle
3239 of the hosts loop.
3240
3241. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3242 Some addresses may be successfully delivered, others may fail, and yet
3243 others may get temporary errors and so get marked DEFER.
3244
3245. The return from the delivery attempt is OK if a connection was made and a
3246 valid SMTP dialogue was completed. Otherwise it is DEFER.
3247
3248. If OK, add a "remove" retry item for this host/IPaddress, if any.
3249
3250. If fail to connect, or other defer state, add a retry item.
3251
3252. If there are any addresses whose status is still DEFER, carry on to the
3253 next host/IPaddress, unless we have tried the number of hosts given
533244af 3254 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH		 3255 there is some fancy logic for hosts_max_try that means its limit can be
3256 overstepped in some circumstances.
0756eb3c
PH		 3257
3258If we get to the end of the list, all hosts have deferred at least one address,
3259or not reached their retry times. If delay_after_cutoff is unset, it requests a
3260delivery attempt to those hosts whose last try was before the arrival time of
3261the current message. To cope with this, we have to go round the loop a second
3262time. After that, set the status and error data for any addresses that haven't
3263had it set already. */
3264
3265for (cutoff_retry = 0; expired &&
3266 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3267 cutoff_retry++)
3268 {
3269 host_item *nexthost = NULL;
3270 int unexpired_hosts_tried = 0;
3271
3272 for (host = hostlist;
8e669ac1 3273 host != NULL &&
533244af
PH		 3274 unexpired_hosts_tried < ob->hosts_max_try &&
3275 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH		 3276 host = nexthost)
3277 {
3278 int rc;
3279 int host_af;
3280 uschar *rs;
3281 BOOL serialized = FALSE;
3282 BOOL host_is_expired = FALSE;
3283 BOOL message_defer = FALSE;
0756eb3c
PH		 3284 BOOL some_deferred = FALSE;
3285 address_item *first_addr = NULL;
3286 uschar *interface = NULL;
3287 uschar *retry_host_key = NULL;
3288 uschar *retry_message_key = NULL;
3289 uschar *serialize_key = NULL;
3290
9c4e8f60
PH		 3291 /* Default next host is next host. :-) But this can vary if the
3292 hosts_max_try limit is hit (see below). It may also be reset if a host
3293 address is looked up here (in case the host was multihomed). */
3294
3295 nexthost = host->next;
3296
0756eb3c
PH		 3297 /* If the address hasn't yet been obtained from the host name, look it up
3298 now, unless the host is already marked as unusable. If it is marked as
3299 unusable, it means that the router was unable to find its IP address (in
3300 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3301 the lookup failed last time. We don't get this far if *all* MX records
3302 point to non-existent hosts; that is treated as a hard error.
3303
3304 We can just skip this host entirely. When the hosts came from the router,
3305 the address will timeout based on the other host(s); when the address is
3306 looked up below, there is an explicit retry record added.
3307
3308 Note that we mustn't skip unusable hosts if the address is not unset; they
3309 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3310
3311 if (host->address == NULL)
3312 {
322050c2 3313 int new_port, flags;
7cd1141b 3314 host_item *hh;
0756eb3c
PH		 3315
3316 if (host->status >= hstatus_unusable)
3317 {
3318 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3319 host->name);
3320 continue;
3321 }
3322
3323 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3324
7cd1141b
PH		 3325 /* The host name is permitted to have an attached port. Find it, and
3326 strip it from the name. Just remember it for now. */
3327
3328 new_port = host_item_get_port(host);
3329
3330 /* Count hosts looked up */
3331
0756eb3c
PH		 3332 hosts_looked_up++;
3333
3334 /* Find by name if so configured, or if it's an IP address. We don't
3335 just copy the IP address, because we need the test-for-local to happen. */
3336
322050c2
PH		 3337 flags = HOST_FIND_BY_A;
3338 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3339 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3340
7e66e54d 3341 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3342 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3343 else
0756eb3c 3344 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3345 &ob->dnssec, /* domains for request/require */
55414b25 3346 NULL, NULL);
0756eb3c 3347
7cd1141b
PH		 3348 /* Update the host (and any additional blocks, resulting from
3349 multihoming) with a host-specific port, if any. */
3350
3351 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3352
0756eb3c
PH		 3353 /* Failure to find the host at this time (usually DNS temporary failure)
3354 is really a kind of routing failure rather than a transport failure.
3355 Therefore we add a retry item of the routing kind, not to stop us trying
3356 to look this name up here again, but to ensure the address gets timed
3357 out if the failures go on long enough. A complete failure at this point
3358 commonly points to a configuration error, but the best action is still
3359 to carry on for the next host. */
3360
3361 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3362 {
3363 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3364 expired = FALSE;
3365 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3366 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3367 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3368 host->status = hstatus_unusable;
3369
3370 for (addr = addrlist; addr != NULL; addr = addr->next)
3371 {
3372 if (addr->transport_return != DEFER) continue;
3373 addr->basic_errno = ERRNO_UNKNOWNHOST;
3374 addr->message =
3375 string_sprintf("failed to lookup IP address for %s", host->name);
3376 }
3377 continue;
3378 }
3379
3380 /* If the host is actually the local host, we may have a problem, or
3381 there may be some cunning configuration going on. In the problem case,
3382 log things and give up. The default transport status is already DEFER. */
3383
3384 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3385 {
3386 for (addr = addrlist; addr != NULL; addr = addr->next)
3387 {
3388 addr->basic_errno = 0;
3389 addr->message = string_sprintf("%s transport found host %s to be "
3390 "local", tblock->name, host->name);
3391 }
3392 goto END_TRANSPORT;
3393 }
3394 } /* End of block for IP address lookup */
3395
3396 /* If this is a continued delivery, we are interested only in the host
3397 which matches the name of the existing open channel. The check is put
3398 here after the local host lookup, in case the name gets expanded as a
3399 result of the lookup. Set expired FALSE, to save the outer loop executing
3400 twice. */
3401
3402 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3403 Ustrcmp(continue_host_address, host->address) != 0))
3404 {
3405 expired = FALSE;
3406 continue; /* With next host */
3407 }
3408
9c4e8f60
PH		 3409 /* Reset the default next host in case a multihomed host whose addresses
3410 are not looked up till just above added to the host list. */
83364d30
PH		 3411
3412 nexthost = host->next;
3413
0756eb3c
PH		 3414 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3415 domain is in queue_smtp_domains, we don't actually want to attempt any
3416 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3417 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3418 were not in it. We don't want to hold up all SMTP deliveries! Except when
3419 doing a two-stage queue run, don't do this if forcing. */
3420
3421 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH		 3422 match_isinlist(addrlist->domain,
3423 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3424 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH		 3425 {
3426 expired = FALSE;
3427 for (addr = addrlist; addr != NULL; addr = addr->next)
3428 {
3429 if (addr->transport_return != DEFER) continue;
3430 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3431 }
3432 continue; /* With next host */
3433 }
3434
3435 /* Count hosts being considered - purely for an intelligent comment
3436 if none are usable. */
3437
3438 hosts_total++;
3439
3440 /* Set $host and $host address now in case they are needed for the
3441 interface expansion or the serialize_hosts check; they remain set if an
3442 actual delivery happens. */
3443
3444 deliver_host = host->name;
3445 deliver_host_address = host->address;
783b385f
JH		 3446 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3447 : host->dnssec == DS_NO ? US"no"
3448 : US"";
0756eb3c 3449
7cd1141b
PH		 3450 /* Set up a string for adding to the retry key if the port number is not
3451 the standard SMTP port. A host may have its own port setting that overrides
3452 the default. */
3453
3454 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3455 port : host->port);
3456 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3457
0756eb3c 3458 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
6f6dedcc
JH		 3459 string is set, even if constant (as different transports can have different
3460 constant settings), we must add it to the key that is used for retries,
3461 because connections to the same host from a different interface should be
3462 treated separately. */
0756eb3c
PH		 3463
3464 host_af = (Ustrchr(host->address, &