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Logging: support +outgoing_port on defer lines and per-host error lines
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH		 1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
3386088d 5/* Copyright (c) University of Cambridge 1995 - 2015 */
0756eb3c
PH		 6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
506900af
JH		 22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
9c695f6d
JH		 24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
48c7f9e2
PH		 27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
0756eb3c
PH		 29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
382afc6b
PH		 33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
0756eb3c
PH		 35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 45#ifndef DISABLE_DKIM
f7572e5a
TK		 46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 58#endif
0756eb3c
PH		 59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
9e4f5962
PP		 67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
0756eb3c
PH		 69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 75#ifdef SUPPORT_TLS
b1770b6e 76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
2d571266 77 ignore; 4.83 will warn, and a later-still release will remove
17c76198 78 these options, so that using them becomes an error. */
83da1223
PH		 79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 85#endif
0756eb3c
PH		 86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH		 92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 94#ifdef SUPPORT_TLS
0756eb3c
PH		 95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 97#endif
0756eb3c
PH		 98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH		 100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 102#ifdef SUPPORT_TLS
0756eb3c
PH		 103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 105#endif
0756eb3c
PH		 106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 110#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
44662487
JH		 111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113#endif
0756eb3c
PH		 114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 116#ifdef SUPPORT_TLS
7a31d643
JH		 117# ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120# endif
f2de3a33 121# ifndef DISABLE_OCSP
f5d78688
JH		 122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124# endif
0756eb3c
PH		 125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 127#endif
0756eb3c
PH		 128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 130#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
96e47838
TL		 131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133#endif
8ccd00b1 134#ifndef DISABLE_PRDR
fd98a5c6
JH		 135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137#endif
99400968
JH		 138#ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141#endif
0756eb3c
PH		 142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH		 146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH		 148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
506900af 150 { "multi_domain", opt_expand_bool | opt_public,
0756eb3c
PH		 151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 156 { "retry_include_ip_address", opt_expand_bool,
0756eb3c
PH		 157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
7eb6c37c
JH		 162#ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165#endif
80a47a2c 166#ifdef SUPPORT_TLS
0756eb3c
PH		 167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP		 171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH		 173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 175 { "tls_require_ciphers", opt_stringptr,
0756eb3c 176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP		 177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH		 179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
a63be306
WB		 181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
e51c7be2
JH		 183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 185 { "tls_verify_certificates", opt_stringptr,
a63be306
WB		 186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 189#endif
0756eb3c
PH		 190};
191
192/* Size of the options list. An extern variable has to be used so that its
193address can appear in the tables drtables.c. */
194
195int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198/* Default private options block for the smtp transport. */
199
200smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
9e4f5962 210 NULL, /* DSCP */
0756eb3c
PH		 211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
96e47838
TL		 214#ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
7a31d643 216 NULL, /* hosts_require_dane */
96e47838 217#endif
8ccd00b1 218#ifndef DISABLE_PRDR
ad07e9ad 219 US"*", /* hosts_try_prdr */
f5d78688 220#endif
f2de3a33 221#ifndef DISABLE_OCSP
0e66b3b6 222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688 223 NULL, /* hosts_require_ocsp */
fd98a5c6 224#endif
0756eb3c
PH		 225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
6c9ed72e 227 NULL, /* hosts_verify_avoid_tls */
c51b8e75 228 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH		 229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
8e669ac1 237 50, /* hosts_max_try_hardlimit */
48c7f9e2 238 TRUE, /* address_retry_include_sender */
0756eb3c 239 FALSE, /* allow_localhost */
382afc6b 240 FALSE, /* authenticated_sender_force */
0756eb3c
PH		 241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
0539a19d 244 { NULL, NULL }, /* dnssec_domains {request,require} */
0756eb3c
PH		 245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
f1513293 249 FALSE, /* lmtp_ignore_quota */
9c695f6d 250 NULL, /* expand_retry_include_ip_address */
0756eb3c 251 TRUE /* retry_include_ip_address */
7eb6c37c 252#ifdef EXPERIMENTAL_SOCKS
7eb6c37c 253 ,NULL /* socks_proxy */
b8bf753b 254#endif
80a47a2c 255#ifdef SUPPORT_TLS
0756eb3c
PH		 256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
83da1223
PH		 260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
54c90be1 263 NULL, /* tls_sni */
0e0f3f56 264 US"system", /* tls_verify_certificates */
54c90be1
PP		 265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
a63be306
WB		 267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
610ff438 269 US"*", /* tls_try_verify_hosts */
01a4a5c5 270 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK		 271#endif
272#ifndef DISABLE_DKIM
f7572e5a
TK		 273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
80a47a2c 279#endif
0756eb3c
PH		 280};
281
6c1c3d1d
WB		 282/* some DSN flags for use later */
283
284static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
45500060 287static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB		 288
289
0756eb3c
PH		 290
291/* Local statics */
292
293static uschar *smtp_command; /* Points to last cmd for error messages */
294static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 295static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH		 296
297
298/*************************************************
299* Setup entry point *
300*************************************************/
301
302/* This function is called when the transport is about to be used,
303but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH		 306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
0756eb3c
PH		 308
309Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
929ba01c
PH		 313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
0756eb3c
PH		 315 errmsg place for error message (not used)
316
317Returns: OK always (FAIL, DEFER not used)
318*/
319
320static int
321smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH		 323{
324smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH		 328uid = uid;
329gid = gid;
0756eb3c
PH		 330
331/* Pass back options if required. This interface is getting very messy. */
332
333if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
26da7e20 344 tf->helo_data = ob->helo_data;
0756eb3c
PH		 345 }
346
347/* Set the fallback host list for all the addresses that don't have fallback
348host lists, provided that the local host wasn't present in the original host
349list. */
350
351if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358return OK;
359}
360
361
362
363/*************************************************
364* Initialization entry point *
365*************************************************/
366
367/* Called for each instance, after its options have been read, to
368enable consistency checks to be done, or anything else that needs
369to be set up.
370
371Argument: pointer to the transport instance block
372Returns: nothing
373*/
374
375void
376smtp_transport_init(transport_instance *tblock)
377{
378smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381/* Retry_use_local_part defaults FALSE if unset */
382
383if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386/* Set the default port according to the protocol */
387
388if (ob->port == NULL)
061b7ebd
PP		 389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH		 391
392/* Set up the setup entry point, to be called before subprocesses for this
393transport. */
394
395tblock->setup = smtp_transport_setup;
396
397/* Complain if any of the timeouts are zero. */
398
399if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405/* If hosts_override is set and there are local hosts, set the global
406flag that stops verify from showing router hosts. */
407
408if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410/* If there are any fallback hosts listed, build a chain of host items
411for them, but do not do any lookups at this time. */
412
413host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 414
32d07012 415#ifdef SUPPORT_TLS
2d571266
JH		 416if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
32d07012 422#endif
0756eb3c
PH		 423}
424
425
426
427
428
429/*************************************************
430* Set delivery info into all active addresses *
431*************************************************/
432
433/* Only addresses whose status is >= PENDING are relevant. A lesser
434status means that an address is not currently being processed.
435
436Arguments:
447d236c
PH		 437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 442 host if set, mark addrs as having used this host
895fbaf2
JH		 443 smtp_greeting from peer
444 helo_response from peer
0756eb3c
PH		 445
446If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448this particular type of timeout.
449
450Returns: nothing
451*/
452
7cd1141b
PH		 453static void
454set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
895fbaf2
JH		 455 BOOL pass_message, host_item * host
456#ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458#endif
459 )
0756eb3c
PH		 460{
461address_item *addr;
462int orvalue = 0;
463if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
895fbaf2 468for (addr = addrlist; addr; addr = addr->next)
168dec3b 469 if (addr->transport_return >= PENDING)
447d236c 470 {
168dec3b
JH		 471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
895fbaf2 480 {
168dec3b 481 addr->host_used = host;
895fbaf2
JH		 482#ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490#endif
491 }
447d236c 492 }
0756eb3c
PH		 493}
494
895fbaf2
JH		 495static void
496set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498{
499set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500#ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502#endif
503 );
504}
0756eb3c
PH		 505
506
507/*************************************************
508* Check an SMTP response *
509*************************************************/
510
511/* This function is given an errno code and the SMTP response buffer
512to analyse, together with the host identification for generating messages. It
513sets an appropriate message and puts the first digit of the response code into
514the yield variable. If no response was actually read, a suitable digit is
515chosen.
516
517Arguments:
447d236c
PH		 518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH		 527*/
528
a7538db1
JH		 529static BOOL
530check_response(host_item *host, int *errno_value, int more_errno,
447d236c 531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH		 532{
533uschar *pl = US"";
534
535if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541*yield = '4'; /* Default setting is to give a temporary error */
542
543/* Handle response timeout */
544
545if (*errno_value == ETIMEDOUT)
546 {
c562fd30
JH		 547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
0756eb3c
PH		 549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555/* Handle malformed SMTP response */
556
557if (*errno_value == ERRNO_SMTPFORMAT)
558 {
55414b25 559 const uschar *malfresp = string_printing(buffer);
0756eb3c 560 while (isspace(*malfresp)) malfresp++;
c562fd30
JH		 561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
0756eb3c
PH		 566 return FALSE;
567 }
568
569/* Handle a failed filter process error; can't send QUIT as we mustn't
570end the DATA. */
571
572if (*errno_value == ERRNO_FILTER_FAIL)
573 {
35af9f61 574 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 575 more_errno,
35af9f61 576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH		 577 return FALSE;
578 }
579
580/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581end the DATA. */
582
583if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591/* Handle failure to write a complete data block */
592
593if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
250b6871
JH		 599#ifdef EXPERIMENTAL_INTERNATIONAL
600/* Handle lack of advertised SMTPUTF8, for international message */
601if (*errno_value == ERRNO_UTF8_FWD)
602 {
f358d5e0 603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH		 604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607#endif
608
0756eb3c
PH		 609/* Handle error responses from the remote mailer. */
610
611if (buffer[0] != 0)
612 {
55414b25 613 const uschar *s = string_printing(buffer);
447d236c 614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 615 "%s", pl, smtp_command, s);
447d236c 616 *pass_message = TRUE;
0756eb3c
PH		 617 *yield = buffer[0];
618 return TRUE;
619 }
620
621/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH		 622connection closed) case, which causes deferral. An explicit connection reset
623error has the same effect. Otherwise, put the host's identity in the message,
624leaving the errno value to be interpreted as well. In all cases, we have to
625assume the connection is now dead. */
0756eb3c 626
19b9dc85 627if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH		 628 {
629 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH		 630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
0756eb3c
PH		 632 }
633else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635return FALSE;
636}
637
638
639
640/*************************************************
641* Write error message to logs *
642*************************************************/
643
644/* This writes to the main log and to the message log.
645
646Arguments:
647 addr the address item containing error information
648 host the current host
649
650Returns: nothing
651*/
652
653static void
654write_logs(address_item *addr, host_item *host)
655{
c562fd30
JH		 656uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
1a47b633
JH		 658if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
c562fd30 661if (addr->message)
0756eb3c 662 {
c562fd30 663 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH		 664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669else
670 {
c562fd30
JH		 671 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
672 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
673 strerror(addr->basic_errno));
0756eb3c
PH		 674 }
675}
676
c562fd30
JH		 677static void
678msglog_line(host_item * host, uschar * message)
679{
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
682}
683
0756eb3c
PH		 684
685
774ef2d7 686#ifdef EXPERIMENTAL_EVENT
d68218c7
JH		 687/*************************************************
688* Post-defer action *
689*************************************************/
690
691/* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694Arguments:
d68218c7
JH		 695 addr the address item containing error information
696 host the current host
697
698Returns: nothing
699*/
700
701static void
774ef2d7 702deferred_event_raise(address_item *addr, host_item *host)
d68218c7 703{
774ef2d7 704uschar * action = addr->transport->event_action;
55414b25 705const uschar * save_domain;
a7538db1
JH		 706uschar * save_local;
707
d68218c7 708if (!action)
a7538db1 709 return;
d68218c7 710
a7538db1
JH		 711save_domain = deliver_domain;
712save_local = deliver_localpart;
713
714/*XXX would ip & port already be set up? */
715deliver_host_address = string_copy(host->address);
774ef2d7
JH		 716deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717event_defer_errno = addr->basic_errno;
d68218c7
JH		 718
719router_name = addr->router->name;
720transport_name = addr->transport->name;
a7538db1
JH		 721deliver_domain = addr->domain;
722deliver_localpart = addr->local_part;
723
774ef2d7 724(void) event_raise(action, US"msg:host:defer",
a7538db1
JH		 725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733deliver_localpart = save_local;
734deliver_domain = save_domain;
d68218c7
JH		 735router_name = transport_name = NULL;
736}
737#endif
738
0756eb3c
PH		 739/*************************************************
740* Synchronize SMTP responses *
741*************************************************/
742
743/* This function is called from smtp_deliver() to receive SMTP responses from
744the server, and match them up with the commands to which they relate. When
745PIPELINING is not in use, this function is called after every command, and is
746therefore somewhat over-engineered, but it is simpler to use a single scheme
747that works both with and without PIPELINING instead of having two separate sets
748of code.
749
750The set of commands that are buffered up with pipelining may start with MAIL
751and may end with DATA; in between are RCPT commands that correspond to the
752addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753etc.) are never buffered.
754
755Errors after MAIL or DATA abort the whole process leaving the response in the
756buffer. After MAIL, pending responses are flushed, and the original command is
757re-instated in big_buffer for error messages. For RCPT commands, the remote is
758permitted to reject some recipient addresses while accepting others. However
759certain errors clearly abort the whole process. Set the value in
760transport_return to PENDING_OK if the address is accepted. If there is a
761subsequent general error, it will get reset accordingly. If not, it will get
762converted to OK at the end.
763
764Arguments:
48c7f9e2
PH		 765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
0756eb3c
PH		 780
781Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788*/
789
790static int
791sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH		 792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH		 794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796{
797address_item *addr = *sync_addr;
798int yield = 0;
799
800/* Handle the response for a MAIL command. On error, reinstate the original
801command in big_buffer for error message use, and flush any further pending
802responses before returning, except after I/O errors and timeouts. */
803
804if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
e97957bc
PH		 813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
0756eb3c
PH		 819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
e97957bc 826 errno = save_errno;
0756eb3c 827 }
c562fd30
JH		 828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
0756eb3c
PH		 836 return -3;
837 }
838 }
839
840if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842/* Read and handle the required number of RCPT responses, matching each one up
843with an address by scanning for the next address whose status is PENDING_DEFER.
844*/
845
846while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
c562fd30 851 addr->host_used = host;
0756eb3c
PH		 852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH		 859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
0756eb3c
PH		 861
862 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH		 863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
0756eb3c 867 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 868 }
0756eb3c
PH		 869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
c562fd30
JH		 875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
895fbaf2 877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 878 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 879 update_waiting = FALSE;
0756eb3c
PH		 880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
447d236c 900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH		 901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
447d236c 903 setflag(addr, af_pass_message);
c562fd30 904 msglog_line(host, addr->message);
0756eb3c
PH		 905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
0756eb3c
PH		 918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 921
c562fd30
JH		 922 /* Log temporary errors if there are more hosts to be tried.
923 If not, log this last one in the == line. */
0756eb3c 924
c562fd30
JH		 925 if (host->next)
926 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 927
f6c332bd
PH		 928 /* Do not put this message on the list of those waiting for specific
929 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 930
f6c332bd 931 update_waiting = FALSE;
0756eb3c 932
48c7f9e2
PH		 933 /* Add a retry item for the address so that it doesn't get tried again
934 too soon. If address_retry_include_sender is true, add the sender address
935 to the retry key. */
0756eb3c 936
48c7f9e2
PH		 937 if (address_retry_include_sender)
938 {
939 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
940 sender_address);
941 retry_add_item(addr, altkey, 0);
942 }
943 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH		 944 }
945 }
946 } /* Loop for next RCPT response */
947
948/* Update where to start at for the next block of responses, unless we
949have already handled all the addresses. */
950
951if (addr != NULL) *sync_addr = addr->next;
952
953/* Handle a response to DATA. If we have not had any good recipients, either
954previously or in this block, the response is ignored. */
955
956if (pending_DATA != 0 &&
957 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
958 {
959 int code;
960 uschar *msg;
447d236c 961 BOOL pass_message;
e97957bc
PH		 962 if (pending_DATA > 0 || (yield & 1) != 0)
963 {
964 if (errno == 0 && buffer[0] == '4')
965 {
966 errno = ERRNO_DATA4XX;
967 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
968 }
969 return -3;
970 }
447d236c 971 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH		 972 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
973 "is in use and there were no good recipients\n", msg);
974 }
975
976/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
977present) received 3xx. If any RCPTs were handled and yielded anything other
978than 4xx, yield will be set non-zero. */
979
980return yield;
981}
982
983
984
fcc8e047
JH		 985/* Do the client side of smtp-level authentication */
986/*
987Arguments:
988 buffer EHLO response from server (gets overwritten)
989 addrlist chain of potential addresses to deliver
990 host host to deliver to
991 ob transport options
992 ibp, obp comms channel control blocks
993
994Returns:
995 OK Success, or failed (but not required): global "smtp_authenticated" set
996 DEFER Failed authentication (and was required)
997 ERROR Internal problem
998
999 FAIL_SEND Failed communications - transmit
1000 FAIL - response
1001*/
1002
1003int
1004smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1005 smtp_transport_options_block *ob, BOOL is_esmtp,
1006 smtp_inblock *ibp, smtp_outblock *obp)
1007{
a7538db1
JH		 1008int require_auth;
1009uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 1010
a7538db1
JH		 1011smtp_authenticated = FALSE;
1012client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1013require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1014
a7538db1
JH		 1015if (is_esmtp && !regex_AUTH) regex_AUTH =
1016 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1017 FALSE, TRUE);
fcc8e047 1018
a7538db1
JH		 1019if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1020 {
1021 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1022 expand_nmax = -1; /* reset */
fcc8e047 1023
a7538db1
JH		 1024 /* Must not do this check until after we have saved the result of the
1025 regex match above. */
fcc8e047 1026
a7538db1 1027 if (require_auth == OK ||
5130845b 1028 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH		 1029 {
1030 auth_instance *au;
1031 fail_reason = US"no common mechanisms were found";
fcc8e047 1032
a7538db1 1033 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1034
a7538db1
JH		 1035 /* Scan the configured authenticators looking for one which is configured
1036 for use as a client, which is not suppressed by client_condition, and
1037 whose name matches an authentication mechanism supported by the server.
1038 If one is found, attempt to authenticate by calling its client function.
1039 */
fcc8e047 1040
a7538db1
JH		 1041 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1042 {
1043 uschar *p = names;
1044 if (!au->client ||
1045 (au->client_condition != NULL &&
1046 !expand_check_condition(au->client_condition, au->name,
1047 US"client authenticator")))
1048 {
1049 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1050 au->name,
1051 (au->client)? "client_condition is false" :
1052 "not configured as a client");
1053 continue;
1054 }
fcc8e047 1055
a7538db1 1056 /* Loop to scan supported server mechanisms */
fcc8e047 1057
a7538db1
JH		 1058 while (*p != 0)
1059 {
1060 int rc;
1061 int len = Ustrlen(au->public_name);
1062 while (isspace(*p)) p++;
fcc8e047 1063
a7538db1
JH		 1064 if (strncmpic(au->public_name, p, len) != 0 ||
1065 (p[len] != 0 && !isspace(p[len])))
1066 {
1067 while (*p != 0 && !isspace(*p)) p++;
1068 continue;
1069 }
fcc8e047 1070
a7538db1
JH		 1071 /* Found data for a listed mechanism. Call its client entry. Set
1072 a flag in the outblock so that data is overwritten after sending so
1073 that reflections don't show it. */
fcc8e047 1074
a7538db1
JH		 1075 fail_reason = US"authentication attempt(s) failed";
1076 obp->authenticating = TRUE;
1077 rc = (au->info->clientcode)(au, ibp, obp,
1078 ob->command_timeout, buffer, bufsize);
1079 obp->authenticating = FALSE;
1080 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1081 au->name, rc);
fcc8e047 1082
a7538db1
JH		 1083 /* A temporary authentication failure must hold up delivery to
1084 this host. After a permanent authentication failure, we carry on
1085 to try other authentication methods. If all fail hard, try to
1086 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1087
a7538db1
JH		 1088 switch(rc)
1089 {
1090 case OK:
1091 smtp_authenticated = TRUE; /* stops the outer loop */
1092 client_authenticator = au->name;
1093 if (au->set_client_id != NULL)
1094 client_authenticated_id = expand_string(au->set_client_id);
1095 break;
1096
1097 /* Failure after writing a command */
1098
1099 case FAIL_SEND:
1100 return FAIL_SEND;
1101
1102 /* Failure after reading a response */
1103
1104 case FAIL:
1105 if (errno != 0 || buffer[0] != '5') return FAIL;
1106 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1107 au->name, host->name, host->address, buffer);
1108 break;
1109
1110 /* Failure by some other means. In effect, the authenticator
1111 decided it wasn't prepared to handle this case. Typically this
1112 is the result of "fail" in an expansion string. Do we need to
1113 log anything here? Feb 2006: a message is now put in the buffer
1114 if logging is required. */
1115
1116 case CANCELLED:
1117 if (*buffer != 0)
1118 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1119 "authentication H=%s [%s] %s", au->name, host->name,
1120 host->address, buffer);
1121 break;
1122
1123 /* Internal problem, message in buffer. */
1124
1125 case ERROR:
895fbaf2
JH		 1126 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1127 DEFER, FALSE);
a7538db1
JH		 1128 return ERROR;
1129 }
fcc8e047 1130
a7538db1
JH		 1131 break; /* If not authenticated, try next authenticator */
1132 } /* Loop for scanning supported server mechanisms */
1133 } /* Loop for further authenticators */
fcc8e047 1134 }
a7538db1 1135 }
fcc8e047 1136
a7538db1 1137/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1138
a7538db1
JH		 1139if (require_auth == OK && !smtp_authenticated)
1140 {
895fbaf2 1141 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1142 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1143 FALSE);
a7538db1
JH		 1144 return DEFER;
1145 }
4d8d62b9 1146
a7538db1 1147return OK;
fcc8e047
JH		 1148}
1149
1150
1151/* Construct AUTH appendix string for MAIL TO */
1152/*
1153Arguments
1154 buffer to build string
1155 addrlist chain of potential addresses to deliver
1156 ob transport options
1157
1158Globals smtp_authenticated
1159 client_authenticated_sender
1160Return True on error, otherwise buffer has (possibly empty) terminated string
1161*/
1162
1163BOOL
1164smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1165 smtp_transport_options_block *ob)
1166{
1167uschar *local_authenticated_sender = authenticated_sender;
1168
1169#ifdef notdef
1170 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1171#endif
1172
1173if (ob->authenticated_sender != NULL)
1174 {
1175 uschar *new = expand_string(ob->authenticated_sender);
1176 if (new == NULL)
1177 {
1178 if (!expand_string_forcedfail)
1179 {
1180 uschar *message = string_sprintf("failed to expand "
1181 "authenticated_sender: %s", expand_string_message);
895fbaf2 1182 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH		 1183 return TRUE;
1184 }
1185 }
1186 else if (new[0] != 0) local_authenticated_sender = new;
1187 }
1188
1189/* Add the authenticated sender address if present */
1190
1191if ((smtp_authenticated || ob->authenticated_sender_force) &&
1192 local_authenticated_sender != NULL)
1193 {
1194 string_format(buffer, bufsize, " AUTH=%s",
1195 auth_xtextencode(local_authenticated_sender,
1196 Ustrlen(local_authenticated_sender)));
1197 client_authenticated_sender = string_copy(local_authenticated_sender);
1198 }
1199else
1200 *buffer= 0;
1201
1202return FALSE;
1203}
1204
1205
1206
0e66b3b6
JH		 1207#ifdef EXPERIMENTAL_DANE
1208int
b8b1b5cb 1209tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH		 1210 BOOL dane_required, BOOL * dane)
1211{
1212/* move this out to host.c given the similarity to dns_lookup() ? */
1213uschar buffer[300];
55414b25 1214const uschar * fullname = buffer;
0e66b3b6
JH		 1215
1216/* TLSA lookup string */
1217(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1218
1219switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1220 {
1221 case DNS_AGAIN:
1222 return DEFER; /* just defer this TLS'd conn */
1223
1224 default:
1225 case DNS_FAIL:
1226 if (dane_required)
0e66b3b6 1227 return FAIL;
0e66b3b6
JH		 1228 break;
1229
1230 case DNS_SUCCEED:
1231 if (!dns_is_secure(dnsa))
1232 {
1233 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1234 return DEFER;
1235 }
1236 *dane = TRUE;
1237 break;
1238 }
1239return OK;
1240}
1241#endif
1242
1243
a39bd74d
JB		 1244
1245typedef struct smtp_compare_s
1246{
1247 uschar *current_sender_address;
1248 struct transport_instance *tblock;
1249} smtp_compare_t;
1250
1251/*
1252Create a unique string that identifies this message, it is based on
1253sender_address, helo_data and tls_certificate if enabled. */
1254
1255static uschar *
1256smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1257{
1258address_item * addr1;
1259uschar * if1 = US"";
1260uschar * helo1 = US"";
1261#ifdef SUPPORT_TLS
1262uschar * tlsc1 = US"";
1263#endif
1264uschar * save_sender_address = sender_address;
1265uschar * local_identity = NULL;
1266smtp_transport_options_block * ob =
1267 (smtp_transport_options_block *)tblock->options_block;
1268
1269sender_address = sender;
1270
1271addr1 = deliver_make_addr (sender, TRUE);
1272deliver_set_expansions(addr1);
1273
1274if (ob->interface)
1275 if1 = expand_string(ob->interface);
1276
1277if (ob->helo_data)
1278 helo1 = expand_string(ob->helo_data);
1279
1280#ifdef SUPPORT_TLS
1281if (ob->tls_certificate)
1282 tlsc1 = expand_string(ob->tls_certificate);
1283local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1284#else
1285local_identity = string_sprintf ("%s^%s", if1, helo1);
1286#endif
1287
1288deliver_set_expansions(NULL);
1289sender_address = save_sender_address;
1290
1291return local_identity;
1292}
1293
1294
1295
1296/* This routine is a callback that is called from transport_check_waiting.
1297This function will evaluate the incoming message versus the previous
1298message. If the incoming message is using a different local identity then
1299we will veto this new message. */
1300
1301static BOOL
1302smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1303{
dadff1d4
HSHR		 1304
1305uschar * message_local_identity,
1306 * current_local_identity,
1307 * new_sender_address;
1308
1309current_local_identity =
a39bd74d 1310 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1311
dadff1d4
HSHR		 1312if (!(new_sender_address = deliver_get_sender_address(message_id)))
1313 return 0;
1314
1315message_local_identity =
1316 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB		 1317
1318return Ustrcmp(current_local_identity, message_local_identity) == 0;
1319}
1320
1321
1322
0756eb3c
PH		 1323/*************************************************
1324* Deliver address list to given host *
1325*************************************************/
1326
1327/* If continue_hostname is not null, we get here only when continuing to
1328deliver down an existing channel. The channel was passed as the standard
6c512171
PH		 1329input. TLS is never active on a passed channel; the previous process always
1330closes it down before passing the connection on.
0756eb3c
PH		 1331
1332Otherwise, we have to make a connection to the remote host, and do the
1333initial protocol exchange.
1334
1335When running as an MUA wrapper, if the sender or any recipient is rejected,
1336temporarily or permanently, we force failure for all recipients.
1337
1338Arguments:
1339 addrlist chain of potential addresses to deliver; only those whose
1340 transport_return field is set to PENDING_DEFER are currently
1341 being processed; others should be skipped - they have either
1342 been delivered to an earlier host or IP address, or been
1343 failed by one of them.
1344 host host to deliver to
1345 host_af AF_INET or AF_INET6
2d280592 1346 port default TCP/IP port to use, in host byte order
0756eb3c
PH		 1347 interface interface to bind to, or NULL
1348 tblock transport instance block
0756eb3c
PH		 1349 message_defer set TRUE if yield is OK, but all addresses were deferred
1350 because of a non-recipient, non-host failure, that is, a
1351 4xx response to MAIL FROM, DATA, or ".". This is a defer
1352 that is specific to the message.
1353 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1354 a second attempt after TLS initialization fails
1355
1356Returns: OK - the connection was made and the delivery attempted;
1357 the result for each address is in its data block.
1358 DEFER - the connection could not be made, or something failed
1359 while setting up the SMTP session, or there was a
1360 non-message-specific error, such as a timeout.
1361 ERROR - a filter command is specified for this transport,
1362 and there was a problem setting it up; OR helo_data
1363 or add_headers or authenticated_sender is specified
1364 for this transport, and the string failed to expand
1365*/
1366
1367static int
1368smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1369 uschar *interface, transport_instance *tblock,
0756eb3c
PH		 1370 BOOL *message_defer, BOOL suppress_tls)
1371{
1372address_item *addr;
1373address_item *sync_addr;
1374address_item *first_addr = addrlist;
1375int yield = OK;
1376int address_count;
1377int save_errno;
1378int rc;
1379time_t start_delivery_time = time(NULL);
1380smtp_transport_options_block *ob =
1381 (smtp_transport_options_block *)(tblock->options_block);
1382BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1383BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH		 1384BOOL ok = FALSE;
1385BOOL send_rset = TRUE;
1386BOOL send_quit = TRUE;
1387BOOL setting_up = TRUE;
1388BOOL completed_address = FALSE;
1389BOOL esmtp = TRUE;
1390BOOL pending_MAIL;
447d236c 1391BOOL pass_message = FALSE;
8ccd00b1 1392#ifndef DISABLE_PRDR
fd98a5c6
JH		 1393BOOL prdr_offered = FALSE;
1394BOOL prdr_active;
1395#endif
7ade712c 1396#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1397BOOL utf8_needed = FALSE;
7ade712c
JH		 1398BOOL utf8_offered = FALSE;
1399#endif
6c1c3d1d 1400BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH		 1401#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1402BOOL dane = FALSE;
0539a19d 1403BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH		 1404dns_answer tlsa_dnsa;
1405#endif
0756eb3c
PH		 1406smtp_inblock inblock;
1407smtp_outblock outblock;
1408int max_rcpt = tblock->max_addresses;
f1513293 1409uschar *igquotstr = US"";
a39bd74d 1410
895fbaf2
JH		 1411#ifdef EXPERIMENTAL_DSN_INFO
1412uschar *smtp_greeting = NULL;
1413uschar *helo_response = NULL;
1414#endif
41c7c167 1415uschar *helo_data = NULL;
a39bd74d 1416
0756eb3c
PH		 1417uschar *message = NULL;
1418uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1419uschar *p;
1420uschar buffer[4096];
1421uschar inbuffer[4096];
98470202 1422uschar outbuffer[4096];
0756eb3c
PH		 1423
1424suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1425
1426*message_defer = FALSE;
1427smtp_command = US"initial connection";
1428if (max_rcpt == 0) max_rcpt = 999999;
1429
1430/* Set up the buffer for reading SMTP response packets. */
1431
1432inblock.buffer = inbuffer;
1433inblock.buffersize = sizeof(inbuffer);
1434inblock.ptr = inbuffer;
1435inblock.ptrend = inbuffer;
1436
1437/* Set up the buffer for holding SMTP commands while pipelining */
1438
1439outblock.buffer = outbuffer;
1440outblock.buffersize = sizeof(outbuffer);
1441outblock.ptr = outbuffer;
1442outblock.cmd_count = 0;
1443outblock.authenticating = FALSE;
1444
6c512171
PH		 1445/* Reset the parameters of a TLS session. */
1446
817d9f57
JH		 1447tls_out.bits = 0;
1448tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH		 1449tls_out.ourcert = NULL;
1450tls_out.peercert = NULL;
817d9f57
JH		 1451tls_out.peerdn = NULL;
1452#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1453tls_out.sni = NULL;
5b456975 1454#endif
018058b2 1455tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1456
35aba663
JH		 1457/* Flip the legacy TLS-related variables over to the outbound set in case
1458they're used in the context of the transport. Don't bother resetting
1459afterward as we're in a subprocess. */
1460
1461tls_modify_variables(&tls_out);
1462
061b7ebd
PP		 1463#ifndef SUPPORT_TLS
1464if (smtps)
1465 {
895fbaf2
JH		 1466 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1467 DEFER, FALSE);
018058b2 1468 return ERROR;
061b7ebd
PP		 1469 }
1470#endif
1471
0756eb3c
PH		 1472/* Make a connection to the host if this isn't a continued delivery, and handle
1473the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1474specially so they can be identified for retries. */
1475
1476if (continue_hostname == NULL)
1477 {
a7538db1 1478 /* This puts port into host->port */
0756eb3c 1479 inblock.sock = outblock.sock =
7eb6c37c 1480 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1481
0756eb3c
PH		 1482 if (inblock.sock < 0)
1483 {
895fbaf2
JH		 1484 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1485 NULL, DEFER, FALSE);
0756eb3c
PH		 1486 return DEFER;
1487 }
1488
0e66b3b6
JH		 1489#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1490 {
0e66b3b6
JH		 1491 tls_out.dane_verified = FALSE;
1492 tls_out.tlsa_usage = 0;
1493
0e66b3b6
JH		 1494 if (host->dnssec == DS_YES)
1495 {
bf7aabb4
JH		 1496 if( ( dane_required
1497 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1498 )
1499 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
038597d2 1500 && dane_required /* do not error on only dane-requested */
0e66b3b6 1501 )
4cea764f 1502 {
895fbaf2 1503 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f
JH		 1504 string_sprintf("DANE error: tlsa lookup %s",
1505 rc == DEFER ? "DEFER" : "FAIL"),
895fbaf2 1506 rc, FALSE);
038597d2 1507 return rc;
4cea764f 1508 }
0e66b3b6
JH		 1509 }
1510 else if (dane_required)
1511 {
895fbaf2 1512 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1513 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1514 FAIL, FALSE);
4cea764f 1515 return FAIL;
0e66b3b6
JH		 1516 }
1517
1518 if (dane)
1519 ob->tls_tempfail_tryclear = FALSE;
1520 }
1521#endif /*DANE*/
1522
41c7c167
PH		 1523 /* Expand the greeting message while waiting for the initial response. (Makes
1524 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1525 delayed till here so that $sending_interface and $sending_port are set. */
1526
1527 helo_data = expand_string(ob->helo_data);
810d16ad
JH		 1528#ifdef EXPERIMENTAL_INTERNATIONAL
1529 if (helo_data)
1530 {
1531 uschar * errstr = NULL;
1532 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1533 {
1534 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1535 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH		 1536 yield = DEFER;
1537 goto SEND_QUIT;
1538 }
1539 }
1540#endif
41c7c167 1541
0756eb3c
PH		 1542 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1543 is nevertheless a reasonably clean way of programming this kind of logic,
1544 where you want to escape on any error. */
1545
061b7ebd
PP		 1546 if (!smtps)
1547 {
895fbaf2
JH		 1548 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1549 '2', ob->command_timeout);
1550#ifdef EXPERIMENTAL_DSN_INFO
1551 smtp_greeting = string_copy(buffer);
1552#endif
1553 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1554
774ef2d7 1555#ifdef EXPERIMENTAL_EVENT
b30275b8 1556 {
805c9d53
JH		 1557 uschar * s;
1558 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1559 : host->dnssec==DS_NO ? US"no" : NULL;
1560 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1561 if (s)
a7538db1 1562 {
895fbaf2 1563 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1564 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1565 DEFER, FALSE);
a7538db1
JH		 1566 yield = DEFER;
1567 goto SEND_QUIT;
1568 }
b30275b8 1569 }
a7538db1
JH		 1570#endif
1571
061b7ebd
PP		 1572 /* Now check if the helo_data expansion went well, and sign off cleanly if
1573 it didn't. */
41c7c167 1574
061b7ebd
PP		 1575 if (helo_data == NULL)
1576 {
1577 uschar *message = string_sprintf("failed to expand helo_data: %s",
1578 expand_string_message);
895fbaf2 1579 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP		 1580 yield = DEFER;
1581 goto SEND_QUIT;
1582 }
41c7c167
PH		 1583 }
1584
0756eb3c
PH		 1585/** Debugging without sending a message
1586addrlist->transport_return = DEFER;
1587goto SEND_QUIT;
1588**/
1589
1590 /* Errors that occur after this point follow an SMTP command, which is
1591 left in big_buffer by smtp_write_command() for use in error messages. */
1592
1593 smtp_command = big_buffer;
1594
1595 /* Tell the remote who we are...
1596
1597 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1598 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1599 greeting is of this form. The assumption was that the far end supports it
1600 properly... but experience shows that there are some that give 5xx responses,
1601 even though the banner includes "ESMTP" (there's a bloody-minded one that
1602 says "ESMTP not spoken here"). Cope with that case.
1603
1604 September 2000: Time has passed, and it seems reasonable now to always send
1605 EHLO at the start. It is also convenient to make the change while installing
1606 the TLS stuff.
1607
1608 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1609 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1610 would be no way to send out the mails, so there is now a host list
1611 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1612 PIPELINING problem as well. Maybe it can also be useful to cure other
1613 problems with broken servers.
1614
1615 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1616 Then somebody tried it with a Microsoft mailer... It seems that all other
1617 mailers use upper case for some reason (the RFC is quite clear about case
1618 independence) so, for peace of mind, I gave in. */
1619
5130845b 1620 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1621
061b7ebd
PP		 1622 /* Alas; be careful, since this goto is not an error-out, so conceivably
1623 we might set data between here and the target which we assume to exist
1624 and be usable. I can see this coming back to bite us. */
a7538db1 1625#ifdef SUPPORT_TLS
061b7ebd
PP		 1626 if (smtps)
1627 {
1628 tls_offered = TRUE;
1629 suppress_tls = FALSE;
1630 ob->tls_tempfail_tryclear = FALSE;
1631 smtp_command = US"SSL-on-connect";
1632 goto TLS_NEGOTIATE;
1633 }
a7538db1 1634#endif
061b7ebd 1635
0756eb3c
PH		 1636 if (esmtp)
1637 {
1638 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1639 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1640 goto SEND_FAILED;
1641 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1642 ob->command_timeout))
1643 {
895fbaf2
JH		 1644 if (errno != 0 || buffer[0] == 0 || lmtp)
1645 {
1646#ifdef EXPERIMENTAL_DSN_INFO
1647 helo_response = string_copy(buffer);
1648#endif
1649 goto RESPONSE_FAILED;
1650 }
0756eb3c
PH		 1651 esmtp = FALSE;
1652 }
895fbaf2
JH		 1653#ifdef EXPERIMENTAL_DSN_INFO
1654 helo_response = string_copy(buffer);
1655#endif
0756eb3c
PH		 1656 }
1657 else
1658 {
1659 DEBUG(D_transport)
1660 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1661 }
1662
1663 if (!esmtp)
1664 {
895fbaf2
JH		 1665 BOOL good_response;
1666
0756eb3c
PH		 1667 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1668 goto SEND_FAILED;
895fbaf2
JH		 1669 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1670 '2', ob->command_timeout);
1671#ifdef EXPERIMENTAL_DSN_INFO
1672 helo_response = string_copy(buffer);
1673#endif
1674 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1675 }
1676
f1513293
PH		 1677 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1678 lmtp_ignore_quota option was set. */
1679
1680 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1681 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1682 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1683
0756eb3c
PH		 1684 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1685
a7538db1 1686#ifdef SUPPORT_TLS
0756eb3c
PH		 1687 tls_offered = esmtp &&
1688 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1689 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1690#endif
fd98a5c6 1691
a7538db1 1692#ifndef DISABLE_PRDR
5130845b
JH		 1693 prdr_offered = esmtp
1694 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1695 PCRE_EOPT, NULL, 0) >= 0
1696 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH		 1697
1698 if (prdr_offered)
1699 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1700#endif
7ade712c
JH		 1701
1702#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH		 1703 if (addrlist->prop.utf8_msg)
1704 {
1705 utf8_needed = !addrlist->prop.utf8_downcvt
1706 && !addrlist->prop.utf8_downcvt_maybe;
1707 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1708 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1709
1710 utf8_offered = esmtp
1711 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1712 PCRE_EOPT, NULL, 0) >= 0;
1713 }
7ade712c 1714#endif
0756eb3c
PH		 1715 }
1716
1717/* For continuing deliveries down the same channel, the socket is the standard
1718input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1719below). Set up the pointer to where subsequent commands will be left, for
1720error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1721set from the command line if they were set in the process that passed the
1722connection on. */
1723
895fbaf2
JH		 1724/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1725as the contine goes via transport_pass_socket() and doublefork and exec.
1726It does not wait. Unclear how we keep separate host's responses
1727separate - we could match up by host ip+port as a bodge. */
1728
0756eb3c
PH		 1729else
1730 {
1731 inblock.sock = outblock.sock = fileno(stdin);
1732 smtp_command = big_buffer;
4311097e 1733 host->port = port; /* Record the port that was used */
0756eb3c
PH		 1734 }
1735
1736/* If TLS is available on this connection, whether continued or not, attempt to
1737start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1738send another EHLO - the server may give a different answer in secure mode. We
1739use a separate buffer for reading the response to STARTTLS so that if it is
1740negative, the original EHLO data is available for subsequent analysis, should
1741the client not be required to use TLS. If the response is bad, copy the buffer
1742for error analysis. */
1743
1744#ifdef SUPPORT_TLS
5130845b
JH		 1745if ( tls_offered
1746 && !suppress_tls
1747 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH		 1748 {
1749 uschar buffer2[4096];
1750 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1751 goto SEND_FAILED;
1752
1753 /* If there is an I/O error, transmission of this message is deferred. If
1754 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1755 false, we also defer. However, if there is a temporary rejection of STARTTLS
1756 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1757 STARTTLS, we carry on. This means we will try to send the message in clear,
1758 unless the host is in hosts_require_tls (tested below). */
1759
1760 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1761 ob->command_timeout))
1762 {
0756eb3c
PH		 1763 if (errno != 0 || buffer2[0] == 0 ||
1764 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK		 1765 {
1766 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1767 goto RESPONSE_FAILED;
0dda4340 1768 }
0756eb3c
PH		 1769 }
1770
1771 /* STARTTLS accepted: try to negotiate a TLS session. */
1772
1773 else
061b7ebd 1774 TLS_NEGOTIATE:
0756eb3c 1775 {
0e66b3b6
JH		 1776 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1777# ifdef EXPERIMENTAL_DANE
1778 , dane ? &tlsa_dnsa : NULL
1779# endif
1780 );
0756eb3c
PH		 1781
1782 /* TLS negotiation failed; give an error. From outside, this function may
1783 be called again to try in clear on a new connection, if the options permit
1784 it for this host. */
1785
1786 if (rc != OK)
1787 {
6ebd79ec
JH		 1788# ifdef EXPERIMENTAL_DANE
1789 if (rc == DEFER && dane && !dane_required)
1790 {
1791 log_write(0, LOG_MAIN, "DANE attempt failed;"
1792 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1793 host->name, host->address);
1794 dane = FALSE;
1795 goto TLS_NEGOTIATE;
1796 }
1797# endif
1798
0756eb3c
PH		 1799 save_errno = ERRNO_TLSFAILURE;
1800 message = US"failure while setting up TLS session";
1801 send_quit = FALSE;
1802 goto TLS_FAILED;
1803 }
1804
1805 /* TLS session is set up */
1806
895fbaf2 1807 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH		 1808 if (addr->transport_return == PENDING_DEFER)
1809 {
817d9f57 1810 addr->cipher = tls_out.cipher;
9d1c15ef
JH		 1811 addr->ourcert = tls_out.ourcert;
1812 addr->peercert = tls_out.peercert;
817d9f57 1813 addr->peerdn = tls_out.peerdn;
018058b2 1814 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1815 }
0756eb3c
PH		 1816 }
1817 }
1818
061b7ebd
PP		 1819/* if smtps, we'll have smtp_command set to something else; always safe to
1820reset it here. */
1821smtp_command = big_buffer;
1822
41c7c167
PH		 1823/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1824helo_data is null, we are dealing with a connection that was passed from
1825another process, and so we won't have expanded helo_data above. We have to
1826expand it here. $sending_ip_address and $sending_port are set up right at the
1827start of the Exim process (in exim.c). */
0756eb3c 1828
817d9f57 1829if (tls_out.active >= 0)
0756eb3c 1830 {
061b7ebd 1831 char *greeting_cmd;
895fbaf2
JH		 1832 BOOL good_response;
1833
41c7c167
PH		 1834 if (helo_data == NULL)
1835 {
1836 helo_data = expand_string(ob->helo_data);
1837 if (helo_data == NULL)
1838 {
1839 uschar *message = string_sprintf("failed to expand helo_data: %s",
1840 expand_string_message);
895fbaf2 1841 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH		 1842 yield = DEFER;
1843 goto SEND_QUIT;
1844 }
1845 }
1846
0d0e4455 1847 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP		 1848 if (smtps)
1849 {
895fbaf2
JH		 1850 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1851 '2', ob->command_timeout);
1852#ifdef EXPERIMENTAL_DSN_INFO
1853 smtp_greeting = string_copy(buffer);
1854#endif
1855 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP		 1856 }
1857
1858 if (esmtp)
1859 greeting_cmd = "EHLO";
1860 else
1861 {
1862 greeting_cmd = "HELO";
1863 DEBUG(D_transport)
1864 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP		 1865 }
1866
1867 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1868 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1869 goto SEND_FAILED;
895fbaf2
JH		 1870 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1871 '2', ob->command_timeout);
1872#ifdef EXPERIMENTAL_DSN_INFO
1873 helo_response = string_copy(buffer);
1874#endif
1875 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1876 }
1877
1878/* If the host is required to use a secure channel, ensure that we
1879have one. */
1880
0e66b3b6
JH		 1881else if (
1882# ifdef EXPERIMENTAL_DANE
1883 dane ||
1884# endif
5130845b 1885 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1886 )
0756eb3c
PH		 1887 {
1888 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1889 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH		 1890 tls_offered? "an attempt to start TLS failed" :
1891 "the server did not offer TLS support");
1892 goto TLS_FAILED;
1893 }
0e66b3b6 1894#endif /*SUPPORT_TLS*/
0756eb3c
PH		 1895
1896/* If TLS is active, we have just started it up and re-done the EHLO command,
1897so its response needs to be analyzed. If TLS is not active and this is a
1898continued session down a previously-used socket, we haven't just done EHLO, so
1899we skip this. */
1900
1901if (continue_hostname == NULL
a7538db1 1902#ifdef SUPPORT_TLS
817d9f57 1903 || tls_out.active >= 0
a7538db1 1904#endif
0756eb3c
PH		 1905 )
1906 {
f1513293
PH		 1907 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1908 lmtp_ignore_quota option was set. */
1909
1910 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1911 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1912 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1913
0756eb3c
PH		 1914 /* If the response to EHLO specified support for the SIZE parameter, note
1915 this, provided size_addition is non-negative. */
1916
1917 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1918 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1919 PCRE_EOPT, NULL, 0) >= 0;
1920
1921 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH		 1922 the current host, esmtp will be false, so PIPELINING can never be used. If
1923 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1924
5130845b
JH		 1925 smtp_use_pipelining = esmtp
1926 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1927 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1928 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH		 1929
1930 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1931 smtp_use_pipelining? "" : "not ");
1932
8ccd00b1 1933#ifndef DISABLE_PRDR
5130845b
JH		 1934 prdr_offered = esmtp
1935 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
7ade712c 1936 PCRE_EOPT, NULL, 0) >= 0
5130845b 1937 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH		 1938
1939 if (prdr_offered)
1940 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1941#endif
1942
7ade712c 1943#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH		 1944 if (addrlist->prop.utf8_msg)
1945 utf8_offered = esmtp
1946 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1947 PCRE_EOPT, NULL, 0) >= 0;
7ade712c
JH		 1948#endif
1949
6c1c3d1d 1950 /* Note if the server supports DSN */
7ade712c
JH		 1951 smtp_use_dsn = esmtp
1952 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1953 PCRE_EOPT, NULL, 0) >= 0;
6c1c3d1d 1954 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1955
0756eb3c
PH		 1956 /* Note if the response to EHLO specifies support for the AUTH extension.
1957 If it has, check that this host is one we want to authenticate to, and do
1958 the business. The host name and address must be available when the
1959 authenticator's client driver is running. */
1960
fcc8e047
JH		 1961 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1962 ob, esmtp, &inblock, &outblock))
0756eb3c 1963 {
fcc8e047
JH		 1964 default: goto SEND_QUIT;
1965 case OK: break;
1966 case FAIL_SEND: goto SEND_FAILED;
1967 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH		 1968 }
1969 }
1970
1971/* The setting up of the SMTP call is now complete. Any subsequent errors are
1972message-specific. */
1973
1974setting_up = FALSE;
1975
7ade712c
JH		 1976#ifdef EXPERIMENTAL_INTERNATIONAL
1977/* If this is an international message we need the host to speak SMTPUTF8 */
3c8b3577 1978if (utf8_needed && !utf8_offered)
7ade712c
JH		 1979 {
1980 errno = ERRNO_UTF8_FWD;
1981 goto RESPONSE_FAILED;
1982 }
1983#endif
1984
0756eb3c
PH		 1985/* If there is a filter command specified for this transport, we can now
1986set it up. This cannot be done until the identify of the host is known. */
1987
1988if (tblock->filter_command != NULL)
1989 {
1990 BOOL rc;
1991 uschar buffer[64];
1992 sprintf(CS buffer, "%.50s transport", tblock->name);
1993 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1994 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1995 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH		 1996
1997 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1998 yield ERROR. */
1999
2000 if (!rc)
2001 {
895fbaf2
JH		 2002 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2003 FALSE);
0756eb3c
PH		 2004 yield = ERROR;
2005 goto SEND_QUIT;
2006 }
2007 }
2008
2009
2010/* For messages that have more than the maximum number of envelope recipients,
2011we want to send several transactions down the same SMTP connection. (See
2012comments in deliver.c as to how this reconciles, heuristically, with
2013remote_max_parallel.) This optimization was added to Exim after the following
2014code was already working. The simplest way to put it in without disturbing the
2015code was to use a goto to jump back to this point when there is another
2016transaction to handle. */
2017
2018SEND_MESSAGE:
2019sync_addr = first_addr;
2020address_count = 0;
2021ok = FALSE;
2022send_rset = TRUE;
2023completed_address = FALSE;
2024
2025
2026/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2027qualification, send it, adding something to the message size to allow for
2028imprecision and things that get added en route. Exim keeps the number of lines
2029in a message, so we can give an accurate value for the original message, but we
2030need some additional to handle added headers. (Double "." characters don't get
2031included in the count.) */
2032
2033p = buffer;
2034*p = 0;
2035
2036if (smtp_use_size)
2037 {
2038 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2039 while (*p) p++;
2040 }
2041
8ccd00b1 2042#ifndef DISABLE_PRDR
fd98a5c6
JH		 2043prdr_active = FALSE;
2044if (prdr_offered)
2045 {
2046 for (addr = first_addr; addr; addr = addr->next)
2047 if (addr->transport_return == PENDING_DEFER)
2048 {
2049 for (addr = addr->next; addr; addr = addr->next)
2050 if (addr->transport_return == PENDING_DEFER)
2051 { /* at least two recipients to send */
2052 prdr_active = TRUE;
2053 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2054 break;
fd98a5c6
JH		 2055 }
2056 break;
2057 }
2058 }
fd98a5c6
JH		 2059#endif
2060
7ade712c 2061#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 2062if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
7ade712c
JH		 2063 sprintf(CS p, " SMTPUTF8"), p += 9;
2064#endif
2065
6c1c3d1d
WB		 2066/* check if all addresses have lasthop flag */
2067/* do not send RET and ENVID if true */
7ade712c 2068for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB		 2069 address_count < max_rcpt && addr != NULL;
2070 addr = addr->next)
2071 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2072 {
6c1c3d1d 2073 dsn_all_lasthop = FALSE;
7ade712c
JH		 2074 break;
2075 }
6c1c3d1d
WB		 2076
2077/* Add any DSN flags to the mail command */
2078
7ade712c 2079if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB		 2080 {
2081 if (dsn_ret == dsn_ret_hdrs)
2082 {
45500060 2083 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB		 2084 while (*p) p++;
2085 }
2086 else if (dsn_ret == dsn_ret_full)
2087 {
45500060 2088 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB		 2089 while (*p) p++;
2090 }
2091 if (dsn_envid != NULL)
2092 {
2093 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2094 while (*p) p++;
2095 }
2096 }
6c1c3d1d 2097
6b62e899
JH		 2098/* If an authenticated_sender override has been specified for this transport
2099instance, expand it. If the expansion is forced to fail, and there was already
2100an authenticated_sender for this message, the original value will be used.
2101Other expansion failures are serious. An empty result is ignored, but there is
2102otherwise no check - this feature is expected to be used with LMTP and other
2103cases where non-standard addresses (e.g. without domains) might be required. */
2104
fcc8e047 2105if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH		 2106 {
2107 yield = ERROR;
2108 goto SEND_QUIT;
2109 }
0756eb3c
PH		 2110
2111/* From here until we send the DATA command, we can make use of PIPELINING
2112if the server host supports it. The code has to be able to check the responses
2113at any point, for when the buffer fills up, so we write it totally generally.
2114When PIPELINING is off, each command written reports that it has flushed the
2115buffer. */
2116
2117pending_MAIL = TRUE; /* The block starts with MAIL */
2118
3c8b3577
JH		 2119 {
2120 uschar * s = return_path;
2121#ifdef EXPERIMENTAL_INTERNATIONAL
2122 uschar * errstr = NULL;
2123
2124 /* If we must downconvert, do the from-address here. Remember we had to
2125 for the to-addresses (done below), and also (ugly) for re-doing when building
2126 the delivery log line. */
2127
2128 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2129 {
2130 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2131 {
895fbaf2 2132 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH		 2133 yield = ERROR;
2134 goto SEND_QUIT;
2135 }
2136 setflag(addrlist, af_utf8_downcvt);
2137 }
2138#endif
2139
2140 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2141 "MAIL FROM:<%s>%s\r\n", s, buffer);
2142 }
2143
0756eb3c
PH		 2144mail_command = string_copy(big_buffer); /* Save for later error message */
2145
2146switch(rc)
2147 {
2148 case -1: /* Transmission error */
7ade712c 2149 goto SEND_FAILED;
0756eb3c
PH		 2150
2151 case +1: /* Block was sent */
7ade712c 2152 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2153 ob->command_timeout))
e97957bc 2154 {
7ade712c
JH		 2155 if (errno == 0 && buffer[0] == '4')
2156 {
2157 errno = ERRNO_MAIL4XX;
2158 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2159 }
2160 goto RESPONSE_FAILED;
e97957bc 2161 }
7ade712c
JH		 2162 pending_MAIL = FALSE;
2163 break;
0756eb3c
PH		 2164 }
2165
2166/* Pass over all the relevant recipient addresses for this host, which are the
2167ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2168several before we have to read the responses for those seen so far. This
2169checking is done by a subroutine because it also needs to be done at the end.
2170Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2171the next one if not all are sent.
2172
2173In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2174last address because we want to abort if any recipients have any kind of
2175problem, temporary or permanent. We know that all recipient addresses will have
2176the PENDING_DEFER status, because only one attempt is ever made, and we know
2177that max_rcpt will be large, so all addresses will be done at once. */
2178
2179for (addr = first_addr;
2180 address_count < max_rcpt && addr != NULL;
2181 addr = addr->next)
2182 {
2183 int count;
2184 BOOL no_flush;
3c8b3577 2185 uschar * rcpt_addr;
0756eb3c 2186
a7538db1 2187 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2188
0756eb3c
PH		 2189 if (addr->transport_return != PENDING_DEFER) continue;
2190
2191 address_count++;
2192 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2193
6c1c3d1d
WB		 2194 /* Add any DSN flags to the rcpt command and add to the sent string */
2195
2196 p = buffer;
2197 *p = 0;
2198
a7538db1 2199 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB		 2200 {
2201 if ((addr->dsn_flags & rf_dsnflags) != 0)
2202 {
2203 int i;
2204 BOOL first = TRUE;
45500060 2205 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB		 2206 while (*p) p++;
2207 for (i = 0; i < 4; i++)
6c1c3d1d
WB		 2208 if ((addr->dsn_flags & rf_list[i]) != 0)
2209 {
2210 if (!first) *p++ = ',';
2211 first = FALSE;
45500060 2212 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB		 2213 while (*p) p++;
2214 }
6c1c3d1d
WB		 2215 }
2216
a7538db1
JH		 2217 if (addr->dsn_orcpt != NULL)
2218 {
6c1c3d1d
WB		 2219 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2220 addr->dsn_orcpt);
2221 while (*p) p++;
2222 }
2223 }
6c1c3d1d 2224
0756eb3c
PH		 2225 /* Now send the RCPT command, and process outstanding responses when
2226 necessary. After a timeout on RCPT, we just end the function, leaving the
2227 yield as OK, because this error can often mean that there is a problem with
2228 just one address, so we don't want to delay the host. */
2229
3c8b3577
JH		 2230 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2231
2232#ifdef EXPERIMENTAL_INTERNATIONAL
2233 {
2234 uschar * dummy_errstr;
2235 if ( testflag(addrlist, af_utf8_downcvt)
2236 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2237 dummy_errstr
2238 ) )
2239 {
2240 errno = ERRNO_EXPANDFAIL;
2241 goto SEND_FAILED;
2242 }
2243 }
2244#endif
2245
6c1c3d1d 2246 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2247 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2248
0756eb3c
PH		 2249 if (count < 0) goto SEND_FAILED;
2250 if (count > 0)
2251 {
2252 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH		 2253 &sync_addr, host, count, ob->address_retry_include_sender,
2254 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2255 sizeof(buffer)))
0756eb3c
PH		 2256 {
2257 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2258 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2259 break;
2260
2261 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2262 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2263 case 0: /* No 2xx or 5xx, but no probs */
2264 break;
2265
2266 case -1: goto END_OFF; /* Timeout on RCPT */
2267 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2268 }
2269 pending_MAIL = FALSE; /* Dealt with MAIL */
2270 }
2271 } /* Loop for next address */
2272
2273/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2274permanently or temporarily. We should have flushed and synced after the last
2275RCPT. */
2276
2277if (mua_wrapper)
2278 {
2279 address_item *badaddr;
168dec3b
JH		 2280 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2281 if (badaddr->transport_return != PENDING_OK)
2282 {
2283 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH		 2284 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2285 testflag(badaddr, af_pass_message));
168dec3b
JH		 2286 ok = FALSE;
2287 break;
2288 }
0756eb3c
PH		 2289 }
2290
2291/* If ok is TRUE, we know we have got at least one good recipient, and must now
2292send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2293have a good recipient buffered up if we are pipelining. We don't want to waste
2294time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2295are pipelining. The responses are all handled by sync_responses(). */
2296
2297if (ok || (smtp_use_pipelining && !mua_wrapper))
2298 {
2299 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2300 if (count < 0) goto SEND_FAILED;
2301 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH		 2302 host, count, ob->address_retry_include_sender, pending_MAIL,
2303 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH		 2304 {
2305 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2306 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2307 break;
2308
2309 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2310 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2311 case 0: break; /* No 2xx or 5xx, but no probs */
2312
2313 case -1: goto END_OFF; /* Timeout on RCPT */
2314 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2315 }
2316 }
2317
2318/* Save the first address of the next batch. */
2319
2320first_addr = addr;
2321
2322/* If there were no good recipients (but otherwise there have been no
2323problems), just set ok TRUE, since we have handled address-specific errors
2324already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2325for handling the SMTP dot-handling protocol, flagging to apply to headers as
2326well as body. Set the appropriate timeout value to be used for each chunk.
2327(Haven't been able to make it work using select() for writing yet.) */
2328
2329if (!ok) ok = TRUE; else
2330 {
2331 sigalrm_seen = FALSE;
2332 transport_write_timeout = ob->data_timeout;
2333 smtp_command = US"sending data block"; /* For error messages */
2334 DEBUG(D_transport|D_v)
2335 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2336 transport_count = 0;
a7538db1 2337
80a47a2c 2338#ifndef DISABLE_DKIM
4cd12fe9
TK		 2339 ok = dkim_transport_write_message(addrlist, inblock.sock,
2340 topt_use_crlf | topt_end_dot | topt_escape_headers |
2341 (tblock->body_only? topt_no_headers : 0) |
2342 (tblock->headers_only? topt_no_body : 0) |
2343 (tblock->return_path_add? topt_add_return_path : 0) |
2344 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2345 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2346 0, /* No size limit */
2347 tblock->add_headers, tblock->remove_headers,
2348 US".", US"..", /* Escaping strings */
2349 tblock->rewrite_rules, tblock->rewrite_existflags,
2350 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2351 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK		 2352 );
2353#else
0756eb3c
PH		 2354 ok = transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2361 0, /* No size limit */
2362 tblock->add_headers, tblock->remove_headers,
2363 US".", US"..", /* Escaping strings */
2364 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2365#endif
0756eb3c
PH		 2366
2367 /* transport_write_message() uses write() because it is called from other
2368 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2369 it can exit with "Broken pipe" as its error. This really means that the
2370 socket got closed at the far end. */
2371
2372 transport_write_timeout = 0; /* for subsequent transports */
2373
2374 /* Failure can either be some kind of I/O disaster (including timeout),
2375 or the failure of a transport filter or the expansion of added headers. */
2376
2377 if (!ok)
2378 {
2379 buffer[0] = 0; /* There hasn't been a response */
2380 goto RESPONSE_FAILED;
2381 }
2382
2383 /* We used to send the terminating "." explicitly here, but because of
2384 buffering effects at both ends of TCP/IP connections, you don't gain
2385 anything by keeping it separate, so it might as well go in the final
2386 data buffer for efficiency. This is now done by setting the topt_end_dot
2387 flag above. */
2388
2389 smtp_command = US"end of data";
2390
8ccd00b1 2391#ifndef DISABLE_PRDR
fd98a5c6
JH		 2392 /* For PRDR we optionally get a partial-responses warning
2393 * followed by the individual responses, before going on with
2394 * the overall response. If we don't get the warning then deal
2395 * with per non-PRDR. */
2396 if(prdr_active)
2397 {
2398 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2399 ob->final_timeout);
2400 if (!ok && errno == 0)
2401 switch(buffer[0])
2402 {
2403 case '2': prdr_active = FALSE;
2404 ok = TRUE;
2405 break;
2406 case '4': errno = ERRNO_DATA4XX;
2407 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2408 break;
2409 }
2410 }
2411 else
2412#endif
2413
2414 /* For non-PRDR SMTP, we now read a single response that applies to the
2415 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2416
e97957bc
PH		 2417 if (!lmtp)
2418 {
2419 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2420 ob->final_timeout);
2421 if (!ok && errno == 0 && buffer[0] == '4')
2422 {
2423 errno = ERRNO_DATA4XX;
2424 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2425 }
2426 }
0756eb3c
PH		 2427
2428 /* For LMTP, we get back a response for every RCPT command that we sent;
2429 some may be accepted and some rejected. For those that get a response, their
2430 status is fixed; any that are accepted have been handed over, even if later
2431 responses crash - at least, that's how I read RFC 2033.
2432
2433 If all went well, mark the recipient addresses as completed, record which
2434 host/IPaddress they were delivered to, and cut out RSET when sending another
2435 message down the same channel. Write the completed addresses to the journal
2436 now so that they are recorded in case there is a crash of hardware or
2437 software before the spool gets updated. Also record the final SMTP
2438 confirmation if needed (for SMTP only). */
2439
2440 if (ok)
2441 {
2442 int flag = '=';
2443 int delivery_time = (int)(time(NULL) - start_delivery_time);
2444 int len;
0756eb3c
PH		 2445 uschar *conf = NULL;
2446 send_rset = FALSE;
2447
0756eb3c
PH		 2448 /* Set up confirmation if needed - applies only to SMTP */
2449
d68218c7 2450 if (
774ef2d7 2451#ifndef EXPERIMENTAL_EVENT
6c6d6e48 2452 LOGGING(smtp_confirmation) &&
a7538db1 2453#endif
d68218c7
JH		 2454 !lmtp
2455 )
0756eb3c 2456 {
55414b25
JH		 2457 const uschar *s = string_printing(buffer);
2458 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2459 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH		 2460 }
2461
fd98a5c6 2462 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH		 2463 each one. */
2464
2465 for (addr = addrlist; addr != first_addr; addr = addr->next)
2466 {
2467 if (addr->transport_return != PENDING_OK) continue;
2468
2469 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2470 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH		 2471 address. For temporary errors, add a retry item for the address so that
2472 it doesn't get tried again too soon. */
0756eb3c 2473
8ccd00b1 2474#ifndef DISABLE_PRDR
fd98a5c6
JH		 2475 if (lmtp || prdr_active)
2476#else
0756eb3c 2477 if (lmtp)
fd98a5c6 2478#endif
0756eb3c
PH		 2479 {
2480 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2481 ob->final_timeout))
2482 {
2483 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2484 addr->message = string_sprintf(
8ccd00b1 2485#ifndef DISABLE_PRDR
fd98a5c6
JH		 2486 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2487#else
2488 "LMTP error after %s: %s",
2489#endif
0756eb3c 2490 big_buffer, string_printing(buffer));
75def545
PH		 2491 setflag(addr, af_pass_message); /* Allow message to go to user */
2492 if (buffer[0] == '5')
2493 addr->transport_return = FAIL;
2494 else
2495 {
e97957bc
PH		 2496 errno = ERRNO_DATA4XX;
2497 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2498 addr->transport_return = DEFER;
8ccd00b1 2499#ifndef DISABLE_PRDR
fd98a5c6
JH		 2500 if (!prdr_active)
2501#endif
2502 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2503 }
0756eb3c
PH		 2504 continue;
2505 }
2506 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2507 if (LOGGING(smtp_confirmation))
c0ea85ab 2508 {
55414b25
JH		 2509 const uschar *s = string_printing(buffer);
2510 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2511 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2512 }
0756eb3c
PH		 2513 }
2514
2515 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2516 actual host that was used. */
0756eb3c
PH		 2517
2518 addr->transport_return = OK;
2519 addr->more_errno = delivery_time;
d427a7f9 2520 addr->host_used = host;
0756eb3c
PH		 2521 addr->special_action = flag;
2522 addr->message = conf;
8ccd00b1 2523#ifndef DISABLE_PRDR
fd98a5c6
JH		 2524 if (prdr_active) addr->flags |= af_prdr_used;
2525#endif
0756eb3c
PH		 2526 flag = '-';
2527
8ccd00b1 2528#ifndef DISABLE_PRDR
fd98a5c6
JH		 2529 if (!prdr_active)
2530#endif
2531 {
2532 /* Update the journal. For homonymic addresses, use the base address plus
2533 the transport name. See lots of comments in deliver.c about the reasons
2534 for the complications when homonyms are involved. Just carry on after
2535 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2536
fd98a5c6
JH		 2537 if (testflag(addr, af_homonym))
2538 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2539 else
2540 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2541
895fbaf2 2542 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH		 2543 len = Ustrlen(CS buffer);
2544 if (write(journal_fd, buffer, len) != len)
2545 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2546 "%s: %s", buffer, strerror(errno));
2547 }
0756eb3c
PH		 2548 }
2549
8ccd00b1 2550#ifndef DISABLE_PRDR
fd98a5c6
JH		 2551 if (prdr_active)
2552 {
2553 /* PRDR - get the final, overall response. For any non-success
2554 upgrade all the address statuses. */
2555 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2556 ob->final_timeout);
2557 if (!ok)
2558 {
2559 if(errno == 0 && buffer[0] == '4')
2560 {
2561 errno = ERRNO_DATA4XX;
2562 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2563 }
2564 for (addr = addrlist; addr != first_addr; addr = addr->next)
2565 if (buffer[0] == '5' || addr->transport_return == OK)
2566 addr->transport_return = PENDING_OK; /* allow set_errno action */
2567 goto RESPONSE_FAILED;
2568 }
2569
2570 /* Update the journal, or setup retry. */
2571 for (addr = addrlist; addr != first_addr; addr = addr->next)
2572 if (addr->transport_return == OK)
2573 {
2574 if (testflag(addr, af_homonym))
2575 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2576 else
2577 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2578
895fbaf2 2579 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH		 2580 len = Ustrlen(CS buffer);
2581 if (write(journal_fd, buffer, len) != len)
2582 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2583 "%s: %s", buffer, strerror(errno));
2584 }
2585 else if (addr->transport_return == DEFER)
2586 retry_add_item(addr, addr->address_retry_key, -2);
2587 }
2588#endif
2589
0756eb3c
PH		 2590 /* Ensure the journal file is pushed out to disk. */
2591
54fc8428 2592 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH		 2593 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2594 strerror(errno));
2595 }
2596 }
2597
2598
2599/* Handle general (not specific to one address) failures here. The value of ok
2600is used to skip over this code on the falling through case. A timeout causes a
2601deferral. Other errors may defer or fail according to the response code, and
2602may set up a special errno value, e.g. after connection chopped, which is
2603assumed if errno == 0 and there is no text in the buffer. If control reaches
2604here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2605the problem is not related to this specific message. */
2606
2607if (!ok)
2608 {
895fbaf2
JH		 2609 int code, set_rc;
2610 uschar * set_message;
0756eb3c
PH		 2611
2612 RESPONSE_FAILED:
895fbaf2
JH		 2613 {
2614 save_errno = errno;
2615 message = NULL;
2616 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2617 buffer, &code, &message, &pass_message);
2618 goto FAILED;
2619 }
0756eb3c
PH		 2620
2621 SEND_FAILED:
895fbaf2
JH		 2622 {
2623 save_errno = errno;
2624 code = '4';
2625 message = US string_sprintf("send() to %s [%s] failed: %s",
2626 host->name, host->address, strerror(save_errno));
2627 send_quit = FALSE;
2628 goto FAILED;
2629 }
0756eb3c
PH		 2630
2631 /* This label is jumped to directly when a TLS negotiation has failed,
2632 or was not done for a host for which it is required. Values will be set
2633 in message and save_errno, and setting_up will always be true. Treat as
2634 a temporary error. */
2635
a7538db1 2636#ifdef SUPPORT_TLS
0756eb3c
PH		 2637 TLS_FAILED:
2638 code = '4';
a7538db1 2639#endif
0756eb3c
PH		 2640
2641 /* If the failure happened while setting up the call, see if the failure was
2642 a 5xx response (this will either be on connection, or following HELO - a 5xx
2643 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2644 never going to accept them. For other errors during setting up (timeouts or
2645 whatever), defer all addresses, and yield DEFER, so that the host is not
2646 tried again for a while. */
2647
2648 FAILED:
2649 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2650 set_message = message;
0756eb3c
PH		 2651
2652 if (setting_up)
2653 {
2654 if (code == '5')
895fbaf2 2655 set_rc = FAIL;
0756eb3c 2656 else
895fbaf2 2657 yield = set_rc = DEFER;
0756eb3c
PH		 2658 }
2659
e97957bc 2660 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2661 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH		 2662 the contents of the message rather than a real error on the connection. These
2663 cases are treated in the same way as a 4xx response. This next bit of code
2664 does the classification. */
0756eb3c 2665
e97957bc 2666 else
0756eb3c 2667 {
e97957bc 2668 BOOL message_error;
0756eb3c 2669
e97957bc
PH		 2670 switch(save_errno)
2671 {
250b6871
JH		 2672#ifdef EXPERIMENTAL_INTERNATIONAL
2673 case ERRNO_UTF8_FWD:
2674 code = '5';
2675 /*FALLTHROUGH*/
2676#endif
e97957bc
PH		 2677 case 0:
2678 case ERRNO_MAIL4XX:
2679 case ERRNO_DATA4XX:
250b6871
JH		 2680 message_error = TRUE;
2681 break;
0756eb3c 2682
e97957bc 2683 case ETIMEDOUT:
250b6871
JH		 2684 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2685 Ustrncmp(smtp_command,"end ",4) == 0;
2686 break;
e97957bc
PH		 2687
2688 case ERRNO_SMTPCLOSED:
250b6871
JH		 2689 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2690 break;
e97957bc
PH		 2691
2692 default:
250b6871
JH		 2693 message_error = FALSE;
2694 break;
e97957bc 2695 }
0756eb3c 2696
e97957bc 2697 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2698
e97957bc
PH		 2699 (a) negative response or timeout after MAIL
2700 (b) negative response after DATA
2701 (c) negative response or timeout or dropped connection after "."
250b6871 2702 (d) utf8 support required and not offered
0756eb3c 2703
e97957bc
PH		 2704 It won't be a negative response or timeout after RCPT, as that is dealt
2705 with separately above. The action in all cases is to set an appropriate
2706 error code for all the addresses, but to leave yield set to OK because the
2707 host itself has not failed. Of course, it might in practice have failed
2708 when we've had a timeout, but if so, we'll discover that at the next
2709 delivery attempt. For a temporary error, set the message_defer flag, and
2710 write to the logs for information if this is not the last host. The error
2711 for the last host will be logged as part of the address's log line. */
2712
2713 if (message_error)
0756eb3c 2714 {
e97957bc 2715 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH		 2716
2717 /* If there's an errno, the message contains just the identity of
2718 the host. */
2719
895fbaf2
JH		 2720 if (code == '5')
2721 set_rc = FAIL;
2722 else /* Anything other than 5 is treated as temporary */
e97957bc 2723 {
895fbaf2 2724 set_rc = DEFER;
e97957bc
PH		 2725 if (save_errno > 0)
2726 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2727 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2728 msglog_line(host, message);
e97957bc
PH		 2729 *message_defer = TRUE;
2730 }
2731 }
2732
2733 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2734 ".", or some other transportation error. We defer all addresses and yield
2735 DEFER, except for the case of failed add_headers expansion, or a transport
2736 filter failure, when the yield should be ERROR, to stop it trying other
2737 hosts. */
2738
2739 else
2740 {
895fbaf2 2741 set_rc = DEFER;
e97957bc
PH		 2742 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2743 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH		 2744 }
2745 }
895fbaf2
JH		 2746
2747 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2748#ifdef EXPERIMENTAL_DSN_INFO
2749 , smtp_greeting, helo_response
2750#endif
2751 );
0756eb3c
PH		 2752 }
2753
2754
2755/* If all has gone well, send_quit will be set TRUE, implying we can end the
2756SMTP session tidily. However, if there were too many addresses to send in one
2757message (indicated by first_addr being non-NULL) we want to carry on with the
2758rest of them. Also, it is desirable to send more than one message down the SMTP
2759connection if there are several waiting, provided we haven't already sent so
2760many as to hit the configured limit. The function transport_check_waiting looks
2761for a waiting message and returns its id. Then transport_pass_socket tries to
2762set up a continued delivery by passing the socket on to another process. The
2763variable send_rset is FALSE if a message has just been successfully transfered.
2764
2765If we are already sending down a continued channel, there may be further
2766addresses not yet delivered that are aimed at the same host, but which have not
2767been passed in this run of the transport. In this case, continue_more will be
2768true, and all we should do is send RSET if necessary, and return, leaving the
2769channel open.
2770
2771However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2772do not want to continue with other messages down the same channel, because that
2773can lead to looping between two or more messages, all with the same,
2774temporarily failing address(es). [The retry information isn't updated yet, so
2775new processes keep on trying.] We probably also don't want to try more of this
2776message's addresses either.
2777
2778If we have started a TLS session, we have to end it before passing the
2779connection to a new process. However, not all servers can handle this (Exim
2780can), so we do not pass such a connection on if the host matches
2781hosts_nopass_tls. */
2782
2783DEBUG(D_transport)
2784 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2785 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2786 continue_more, yield, (first_addr == NULL)? "":"not ");
2787
2788if (completed_address && ok && send_quit)
2789 {
2790 BOOL more;
a39bd74d
JB		 2791 smtp_compare_t t_compare;
2792
2793 t_compare.tblock = tblock;
2794 t_compare.current_sender_address = sender_address;
2795
5130845b
JH		 2796 if ( first_addr != NULL
2797 || continue_more
2798 || ( ( tls_out.active < 0
2799 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2800 )
0756eb3c
PH		 2801 &&
2802 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB		 2803 tblock->connection_max_messages, new_message_id, &more,
2804 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2805 ) )
0756eb3c
PH		 2806 {
2807 uschar *msg;
447d236c 2808 BOOL pass_message;
0756eb3c
PH		 2809
2810 if (send_rset)
2811 {
2812 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2813 {
2814 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2815 host->address, strerror(save_errno));
2816 send_quit = FALSE;
2817 }
2818 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2819 ob->command_timeout)))
2820 {
2821 int code;
447d236c
PH		 2822 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2823 &pass_message);
0756eb3c
PH		 2824 if (!send_quit)
2825 {
c562fd30
JH		 2826 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2827 host->name, host->address, msg);
0756eb3c
PH		 2828 }
2829 }
2830 }
2831
2832 /* Either RSET was not needed, or it succeeded */
2833
2834 if (ok)
2835 {
2836 if (first_addr != NULL) /* More addresses still to be sent */
2837 { /* in this run of the transport */
2838 continue_sequence++; /* Causes * in logging */
2839 goto SEND_MESSAGE;
2840 }
2841 if (continue_more) return yield; /* More addresses for another run */
2842
2843 /* Pass the socket to a new Exim process. Before doing so, we must shut
2844 down TLS. Not all MTAs allow for the continuation of the SMTP session
2845 when TLS is shut down. We test for this by sending a new EHLO. If we
2846 don't get a good response, we don't attempt to pass the socket on. */
2847
a7538db1 2848#ifdef SUPPORT_TLS
817d9f57 2849 if (tls_out.active >= 0)
0756eb3c 2850 {
817d9f57 2851 tls_close(FALSE, TRUE);
061b7ebd
PP		 2852 if (smtps)
2853 ok = FALSE;
2854 else
2855 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2856 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2857 ob->command_timeout);
0756eb3c 2858 }
a7538db1 2859#endif
0756eb3c
PH		 2860
2861 /* If the socket is successfully passed, we musn't send QUIT (or
2862 indeed anything!) from here. */
2863
895fbaf2
JH		 2864/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2865propagate it from the initial
2866*/
0756eb3c
PH		 2867 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2868 new_message_id, inblock.sock))
2869 {
2870 send_quit = FALSE;
2871 }
2872 }
2873
2874 /* If RSET failed and there are addresses left, they get deferred. */
2875
895fbaf2
JH		 2876 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2877#ifdef EXPERIMENTAL_DSN_INFO
2878 , smtp_greeting, helo_response
2879#endif
2880 );
0756eb3c
PH		 2881 }
2882 }
2883
2884/* End off tidily with QUIT unless the connection has died or the socket has
2885been passed to another process. There has been discussion on the net about what
2886to do after sending QUIT. The wording of the RFC suggests that it is necessary
2887to wait for a response, but on the other hand, there isn't anything one can do
2888with an error response, other than log it. Exim used to do that. However,
2889further discussion suggested that it is positively advantageous not to wait for
2890the response, but to close the session immediately. This is supposed to move
2891the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2892load from the server. (Hosts that are both servers and clients may not see much
2893difference, of course.) Further discussion indicated that this was safe to do
2894on Unix systems which have decent implementations of TCP/IP that leave the
2895connection around for a while (TIME_WAIT) after the application has gone away.
2896This enables the response sent by the server to be properly ACKed rather than
2897timed out, as can happen on broken TCP/IP implementations on other OS.
2898
2899This change is being made on 31-Jul-98. After over a year of trouble-free
2900operation, the old commented-out code was removed on 17-Sep-99. */
2901
2902SEND_QUIT:
2903if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2904
2905END_OFF:
2906
2907#ifdef SUPPORT_TLS
817d9f57 2908tls_close(FALSE, TRUE);
0756eb3c
PH		 2909#endif
2910
2911/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH		 2912works because the NULL setting is passed back to the calling process, and
2913remote_max_parallel is forced to 1 when delivering over an existing connection,
2914
2915If all went well and continue_more is set, we shouldn't actually get here if
2916there are further addresses, as the return above will be taken. However,
2917writing RSET might have failed, or there may be other addresses whose hosts are
2918specified in the transports, and therefore not visible at top level, in which
2919case continue_more won't get set. */
2920
f1e894f3 2921(void)close(inblock.sock);
a7538db1 2922
774ef2d7
JH		 2923#ifdef EXPERIMENTAL_EVENT
2924(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH		 2925#endif
2926
0756eb3c
PH		 2927continue_transport = NULL;
2928continue_hostname = NULL;
2929return yield;
2930}
2931
2932
2933
2934
2935/*************************************************
2936* Closedown entry point *
2937*************************************************/
2938
2939/* This function is called when exim is passed an open smtp channel
2940from another incarnation, but the message which it has been asked
2941to deliver no longer exists. The channel is on stdin.
2942
2943We might do fancy things like looking for another message to send down
2944the channel, but if the one we sought has gone, it has probably been
2945delivered by some other process that itself will seek further messages,
2946so just close down our connection.
2947
2948Argument: pointer to the transport instance block
2949Returns: nothing
2950*/
2951
2952void
2953smtp_transport_closedown(transport_instance *tblock)
2954{
2955smtp_transport_options_block *ob =
2956 (smtp_transport_options_block *)(tblock->options_block);
2957smtp_inblock inblock;
2958smtp_outblock outblock;
2959uschar buffer[256];
2960uschar inbuffer[4096];
2961uschar outbuffer[16];
2962
2963inblock.sock = fileno(stdin);
2964inblock.buffer = inbuffer;
2965inblock.buffersize = sizeof(inbuffer);
2966inblock.ptr = inbuffer;
2967inblock.ptrend = inbuffer;
2968
2969outblock.sock = inblock.sock;
2970outblock.buffersize = sizeof(outbuffer);
2971outblock.buffer = outbuffer;
2972outblock.ptr = outbuffer;
2973outblock.cmd_count = 0;
2974outblock.authenticating = FALSE;
2975
2976(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2977(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2978 ob->command_timeout);
f1e894f3 2979(void)close(inblock.sock);
0756eb3c
PH		 2980}
2981
2982
2983
2984/*************************************************
2985* Prepare addresses for delivery *
2986*************************************************/
2987
2988/* This function is called to flush out error settings from previous delivery
2989attempts to other hosts. It also records whether we got here via an MX record
2990or not in the more_errno field of the address. We are interested only in
2991addresses that are still marked DEFER - others may have got delivered to a
2992previously considered IP address. Set their status to PENDING_DEFER to indicate
2993which ones are relevant this time.
2994
2995Arguments:
2996 addrlist the list of addresses
2997 host the host we are delivering to
2998
2999Returns: the first address for this delivery
3000*/
3001
3002static address_item *
3003prepare_addresses(address_item *addrlist, host_item *host)
3004{
3005address_item *first_addr = NULL;
3006address_item *addr;
3007for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH		 3008 if (addr->transport_return == DEFER)
3009 {
3010 if (first_addr == NULL) first_addr = addr;
3011 addr->transport_return = PENDING_DEFER;
3012 addr->basic_errno = 0;
3013 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3014 addr->message = NULL;
a7538db1 3015#ifdef SUPPORT_TLS
168dec3b
JH		 3016 addr->cipher = NULL;
3017 addr->ourcert = NULL;
3018 addr->peercert = NULL;
3019 addr->peerdn = NULL;
3020 addr->ocsp = OCSP_NOT_REQ;
895fbaf2
JH		 3021#endif
3022#ifdef EXPERIMENTAL_DSN_INFO
3023 addr->smtp_greeting = NULL;
3024 addr->helo_response = NULL;
a7538db1 3025#endif
168dec3b 3026 }
0756eb3c
PH		 3027return first_addr;
3028}
3029
3030
3031
3032/*************************************************
3033* Main entry point *
3034*************************************************/
3035
3036/* See local README for interface details. As this is a remote transport, it is
3037given a chain of addresses to be delivered in one connection, if possible. It
3038always returns TRUE, indicating that each address has its own independent
3039status set, except if there is a setting up problem, in which case it returns
3040FALSE. */
3041
3042BOOL
3043smtp_transport_entry(
3044 transport_instance *tblock, /* data for this instantiation */
3045 address_item *addrlist) /* addresses we are working on */
3046{
3047int cutoff_retry;
3048int port;
3049int hosts_defer = 0;
3050int hosts_fail = 0;
3051int hosts_looked_up = 0;
3052int hosts_retry = 0;
3053int hosts_serial = 0;
3054int hosts_total = 0;
8e669ac1 3055int total_hosts_tried = 0;
0756eb3c
PH		 3056address_item *addr;
3057BOOL expired = TRUE;
3058BOOL continuing = continue_hostname != NULL;
3059uschar *expanded_hosts = NULL;
3060uschar *pistring;
3061uschar *tid = string_sprintf("%s transport", tblock->name);
3062smtp_transport_options_block *ob =
3063 (smtp_transport_options_block *)(tblock->options_block);
3064host_item *hostlist = addrlist->host_list;
3065host_item *host = NULL;
3066
3067DEBUG(D_transport)
3068 {
3069 debug_printf("%s transport entered\n", tblock->name);
3070 for (addr = addrlist; addr != NULL; addr = addr->next)
3071 debug_printf(" %s\n", addr->address);
3072 if (continuing) debug_printf("already connected to %s [%s]\n",
3073 continue_hostname, continue_host_address);
3074 }
3075
f6c332bd
PH		 3076/* Set the flag requesting that these hosts be added to the waiting
3077database if the delivery fails temporarily or if we are running with
3078queue_smtp or a 2-stage queue run. This gets unset for certain
3079kinds of error, typically those that are specific to the message. */
3080
3081update_waiting = TRUE;
3082
0756eb3c
PH		 3083/* If a host list is not defined for the addresses - they must all have the
3084same one in order to be passed to a single transport - or if the transport has
3085a host list with hosts_override set, use the host list supplied with the
3086transport. It is an error for this not to exist. */
3087
3088if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3089 {
3090 if (ob->hosts == NULL)
3091 {
3092 addrlist->message = string_sprintf("%s transport called with no hosts set",
3093 tblock->name);
3094 addrlist->transport_return = PANIC;
3095 return FALSE; /* Only top address has status */
3096 }
3097
3098 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3099 ob->hosts);
3100
3101 /* If the transport's host list contains no '$' characters, and we are not
3102 randomizing, it is fixed and therefore a chain of hosts can be built once
3103 and for all, and remembered for subsequent use by other calls to this
3104 transport. If, on the other hand, the host list does contain '$', or we are
3105 randomizing its order, we have to rebuild it each time. In the fixed case,
3106 as the hosts string will never be used again, it doesn't matter that we
3107 replace all the : characters with zeros. */
3108
3109 if (ob->hostlist == NULL)
3110 {
3111 uschar *s = ob->hosts;
3112
3113 if (Ustrchr(s, '$') != NULL)
3114 {
d427a7f9 3115 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH		 3116 {
3117 addrlist->message = string_sprintf("failed to expand list of hosts "
3118 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3119 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3120 return FALSE; /* Only top address has status */
3121 }
3122 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3123 "\"%s\"\n", s, expanded_hosts);
3124 s = expanded_hosts;
3125 }
3126 else
3127 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3128
3129 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3130
e276e04b
TF		 3131 /* Check that the expansion yielded something useful. */
3132 if (hostlist == NULL)
3133 {
3134 addrlist->message =
3135 string_sprintf("%s transport has empty hosts setting", tblock->name);
3136 addrlist->transport_return = PANIC;
3137 return FALSE; /* Only top address has status */
3138 }
3139
0756eb3c
PH		 3140 /* If there was no expansion of hosts, save the host list for
3141 next time. */
3142
d427a7f9 3143 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH		 3144 }
3145
3146 /* This is not the first time this transport has been run in this delivery;
3147 the host list was built previously. */
3148
55414b25
JH		 3149 else
3150 hostlist = ob->hostlist;
0756eb3c
PH		 3151 }
3152
3153/* The host list was supplied with the address. If hosts_randomize is set, we
3154must sort it into a random order if it did not come from MX records and has not
3155already been randomized (but don't bother if continuing down an existing
3156connection). */
3157
3158else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3159 {
3160 host_item *newlist = NULL;
3161 while (hostlist != NULL)
3162 {
3163 host_item *h = hostlist;
3164 hostlist = hostlist->next;
3165
3166 h->sort_key = random_number(100);
3167
3168 if (newlist == NULL)
3169 {
3170 h->next = NULL;
3171 newlist = h;
3172 }
3173 else if (h->sort_key < newlist->sort_key)
3174 {
3175 h->next = newlist;
3176 newlist = h;
3177 }
3178 else
3179 {
3180 host_item *hh = newlist;
3181 while (hh->next != NULL)
3182 {
3183 if (h->sort_key < hh->next->sort_key) break;
3184 hh = hh->next;
3185 }
3186 h->next = hh->next;
3187 hh->next = h;
3188 }
3189 }
3190
3191 hostlist = addrlist->host_list = newlist;
3192 }
3193
2d280592 3194/* Sort out the default port. */
0756eb3c
PH		 3195
3196if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3197
0756eb3c
PH		 3198/* For each host-plus-IP-address on the list:
3199
3200. If this is a continued delivery and the host isn't the one with the
3201 current connection, skip.
3202
3203. If the status is unusable (i.e. previously failed or retry checked), skip.
3204
3205. If no IP address set, get the address, either by turning the name into
3206 an address, calling gethostbyname if gethostbyname is on, or by calling
3207 the DNS. The DNS may yield multiple addresses, in which case insert the
3208 extra ones into the list.
3209
3210. Get the retry data if not previously obtained for this address and set the
3211 field which remembers the state of this address. Skip if the retry time is
3212 not reached. If not, remember whether retry data was found. The retry string
3213 contains both the name and the IP address.
3214
3215. Scan the list of addresses and mark those whose status is DEFER as
3216 PENDING_DEFER. These are the only ones that will be processed in this cycle
3217 of the hosts loop.
3218
3219. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3220 Some addresses may be successfully delivered, others may fail, and yet
3221 others may get temporary errors and so get marked DEFER.
3222
3223. The return from the delivery attempt is OK if a connection was made and a
3224 valid SMTP dialogue was completed. Otherwise it is DEFER.
3225
3226. If OK, add a "remove" retry item for this host/IPaddress, if any.
3227
3228. If fail to connect, or other defer state, add a retry item.
3229
3230. If there are any addresses whose status is still DEFER, carry on to the
3231 next host/IPaddress, unless we have tried the number of hosts given
533244af 3232 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH		 3233 there is some fancy logic for hosts_max_try that means its limit can be
3234 overstepped in some circumstances.
0756eb3c
PH		 3235
3236If we get to the end of the list, all hosts have deferred at least one address,
3237or not reached their retry times. If delay_after_cutoff is unset, it requests a
3238delivery attempt to those hosts whose last try was before the arrival time of
3239the current message. To cope with this, we have to go round the loop a second
3240time. After that, set the status and error data for any addresses that haven't
3241had it set already. */
3242
3243for (cutoff_retry = 0; expired &&
3244 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3245 cutoff_retry++)
3246 {
3247 host_item *nexthost = NULL;
3248 int unexpired_hosts_tried = 0;
3249
3250 for (host = hostlist;
8e669ac1 3251 host != NULL &&
533244af
PH		 3252 unexpired_hosts_tried < ob->hosts_max_try &&
3253 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH		 3254 host = nexthost)
3255 {
3256 int rc;
3257 int host_af;
3258 uschar *rs;
3259 BOOL serialized = FALSE;
3260 BOOL host_is_expired = FALSE;
3261 BOOL message_defer = FALSE;
0756eb3c
PH		 3262 BOOL some_deferred = FALSE;
3263 address_item *first_addr = NULL;
3264 uschar *interface = NULL;
3265 uschar *retry_host_key = NULL;
3266 uschar *retry_message_key = NULL;
3267 uschar *serialize_key = NULL;
3268
9c4e8f60
PH		 3269 /* Default next host is next host. :-) But this can vary if the
3270 hosts_max_try limit is hit (see below). It may also be reset if a host
3271 address is looked up here (in case the host was multihomed). */
3272
3273 nexthost = host->next;
3274
0756eb3c
PH		 3275 /* If the address hasn't yet been obtained from the host name, look it up
3276 now, unless the host is already marked as unusable. If it is marked as
3277 unusable, it means that the router was unable to find its IP address (in
3278 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3279 the lookup failed last time. We don't get this far if *all* MX records
3280 point to non-existent hosts; that is treated as a hard error.
3281
3282 We can just skip this host entirely. When the hosts came from the router,
3283 the address will timeout based on the other host(s); when the address is
3284 looked up below, there is an explicit retry record added.
3285
3286 Note that we mustn't skip unusable hosts if the address is not unset; they
3287 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3288
3289 if (host->address == NULL)
3290 {
322050c2 3291 int new_port, flags;
7cd1141b 3292 host_item *hh;
0756eb3c
PH		 3293
3294 if (host->status >= hstatus_unusable)
3295 {
3296 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3297 host->name);
3298 continue;
3299 }
3300
3301 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3302
7cd1141b
PH		 3303 /* The host name is permitted to have an attached port. Find it, and
3304 strip it from the name. Just remember it for now. */
3305
3306 new_port = host_item_get_port(host);
3307
3308 /* Count hosts looked up */
3309
0756eb3c
PH		 3310 hosts_looked_up++;
3311
3312 /* Find by name if so configured, or if it's an IP address. We don't
3313 just copy the IP address, because we need the test-for-local to happen. */
3314
322050c2
PH		 3315 flags = HOST_FIND_BY_A;
3316 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3317 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3318
7e66e54d 3319 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3320 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3321 else
0756eb3c 3322 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3323 &ob->dnssec, /* domains for request/require */
55414b25 3324 NULL, NULL);
0756eb3c 3325
7cd1141b
PH		 3326 /* Update the host (and any additional blocks, resulting from
3327 multihoming) with a host-specific port, if any. */
3328
3329 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3330
0756eb3c
PH		 3331 /* Failure to find the host at this time (usually DNS temporary failure)
3332 is really a kind of routing failure rather than a transport failure.
3333 Therefore we add a retry item of the routing kind, not to stop us trying
3334 to look this name up here again, but to ensure the address gets timed
3335 out if the failures go on long enough. A complete failure at this point
3336 commonly points to a configuration error, but the best action is still
3337 to carry on for the next host. */
3338
3339 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3340 {
3341 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3342 expired = FALSE;
3343 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3344 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3345 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3346 host->status = hstatus_unusable;
3347
3348 for (addr = addrlist; addr != NULL; addr = addr->next)
3349 {
3350 if (addr->transport_return != DEFER) continue;
3351 addr->basic_errno = ERRNO_UNKNOWNHOST;
3352 addr->message =
3353 string_sprintf("failed to lookup IP address for %s", host->name);
3354 }
3355 continue;
3356 }
3357
3358 /* If the host is actually the local host, we may have a problem, or
3359 there may be some cunning configuration going on. In the problem case,
3360 log things and give up. The default transport status is already DEFER. */
3361
3362 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3363 {
3364 for (addr = addrlist; addr != NULL; addr = addr->next)
3365 {
3366 addr->basic_errno = 0;
3367 addr->message = string_sprintf("%s transport found host %s to be "
3368 "local", tblock->name, host->name);
3369 }
3370 goto END_TRANSPORT;
3371 }
3372 } /* End of block for IP address lookup */
3373
3374 /* If this is a continued delivery, we are interested only in the host
3375 which matches the name of the existing open channel. The check is put
3376 here after the local host lookup, in case the name gets expanded as a
3377 result of the lookup. Set expired FALSE, to save the outer loop executing
3378 twice. */
3379
3380 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3381 Ustrcmp(continue_host_address, host->address) != 0))
3382 {
3383 expired = FALSE;
3384 continue; /* With next host */
3385 }
3386
9c4e8f60
PH		 3387 /* Reset the default next host in case a multihomed host whose addresses
3388 are not looked up till just above added to the host list. */
83364d30
PH		 3389
3390 nexthost = host->next;
3391
0756eb3c
PH		 3392 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3393 domain is in queue_smtp_domains, we don't actually want to attempt any
3394 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3395 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3396 were not in it. We don't want to hold up all SMTP deliveries! Except when
3397 doing a two-stage queue run, don't do this if forcing. */
3398
3399 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH		 3400 match_isinlist(addrlist->domain,
3401 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3402 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH		 3403 {
3404 expired = FALSE;
3405 for (addr = addrlist; addr != NULL; addr = addr->next)
3406 {
3407 if (addr->transport_return != DEFER) continue;
3408 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3409 }
3410 continue; /* With next host */
3411 }
3412
3413 /* Count hosts being considered - purely for an intelligent comment
3414 if none are usable. */
3415
3416 hosts_total++;
3417
3418 /* Set $host and $host address now in case they are needed for the
3419 interface expansion or the serialize_hosts check; they remain set if an
3420 actual delivery happens. */
3421
3422 deliver_host = host->name;
3423 deliver_host_address = host->address;
783b385f
JH		 3424 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3425 : host->dnssec == DS_NO ? US"no"
3426 : US"";
0756eb3c 3427
7cd1141b
PH		 3428 /* Set up a string for adding to the retry key if the port number is not
3429 the standard SMTP port. A host may have its own port setting that overrides
3430 the default. */
3431
3432 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3433 port : host->port);
3434 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3435
0756eb3c 3436 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
6f6dedcc
JH		 3437 string is set, even if constant (as different transports can have different
3438 constant settings), we must add it to the key that is used for retries,
3439 because connections to the same host from a different interface should be
3440 treated separately. */
0756eb3c
PH		 3441
3442 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
6f6dedcc
JH		 3443 if ((rs = ob->interface) && *rs)
3444 {
3445 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3446 return FALSE;
3447 pistring = string_sprintf("%s/%s", pistring, interface);
3448 }
0756eb3c
PH		 3449
3450 /* The first time round the outer loop, check the status of the host by
3451 inspecting the retry data. The second time round, we are interested only
3452 in expired hosts that haven't been tried since this message arrived. */
3453
3454 if (cutoff_retry == 0)
3455 {
9c695f6d 3456 BOOL incl_ip;
0756eb3c 3457 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3458 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH		 3459 messages) and also data for retries of a specific message at this host.
3460 If either of these retry records are actually read, the keys used are
3461 returned to save recomputing them later. */
3462
9c695f6d
JH		 3463 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3464 US"retry_include_ip_address", ob->retry_include_ip_address,
3465 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3466 continue; /* with next host */
3467
0756eb3c 3468 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3469 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH		 3470
3471 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3472 (host->address == NULL)? US"" : host->address, pistring,
3473 (host->status == hstatus_usable)? "usable" :
3474 (host->status == hstatus_unusable)? "unusable" :
3475 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3476
3477 /* Skip this address if not usable at this time, noting if it wasn't
3478 actually expired, both locally and in the address. */
3479
3480 switch (host->status)
3481 {
3482 case hstatus_unusable:
3483 expired = FALSE;
3484 setflag(addrlist, af_retry_skipped);
3485 /* Fall through */
3486
3487 case hstatus_unusable_expired:
3488 switch (host->why)
3489 {
3490 case hwhy_retry: hosts_retry++; break;
3491 case hwhy_failed: hosts_fail++; break;
3492 case hwhy_deferred: hosts_defer++; break;
3493 }
3494
3495 /* If there was a retry message key, implying that previously there
3496 was a message-specific defer, we don't want to update the list of
f6c332bd 3497 messages waiting for these hosts. */
0756eb3c 3498
f6c332bd 3499 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH		 3500 continue; /* With the next host or IP address */
3501 }
3502 }
3503
3504 /* Second time round the loop: if the address is set but expired, and
3505 the message is newer than the last try, let it through. */
3506
3507 else
3508 {
3509 if (host->address == NULL ||
3510 host->status != hstatus_unusable_expired ||
3511 host->last_try > received_time)
3512 continue;
3513 DEBUG(D_transport)
3514 debug_printf("trying expired host %s [%s]%s\n",
3515 host->name, host->address, pistring);
3516 host_is_expired = TRUE;
3517 }
3518
3519 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3520 it remains TRUE only if all hosts are expired and none are actually tried.
3521 */
3522
3523 expired = FALSE;
3524
3525 /* If this host is listed as one to which access must be serialized,
3526 see if another Exim process has a connection to it, and if so, skip
3527 this host. If not, update the database to record our connection to it
3528 and remember this for later deletion. Do not do any of this if we are
3529 sending the message down a pre-existing connection. */
3530
3531 if (!continuing &&
5130845b 3532 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH		 3533 {
3534 serialize_key = string_sprintf("host-serialize-%s", host->name);
e8ae7214 3535 if (!enq_start(serialize_key, 1))
0756eb3c
PH		 3536 {
3537 DEBUG(D_transport)
3538 debug_printf("skipping host %s because another Exim process "
3539 "is connected to it\n", host->name);
3540 hosts_serial++;
3541 continue;
3542 }
3543 serialized = TRUE;
3544 }
3545
3546 /* OK, we have an IP address that is not waiting for its retry time to
3547 arrive (it might be expired) OR (second time round the loop) we have an
3548 expired host that hasn't been tried since the message arrived. Have a go
3549 at delivering the message to it. First prepare the addresses by flushing
3550 out the result of previous attempts, and finding the first address that
3551 is still to be delivered. */
3552
3553 first_addr = prepare_addresses(addrlist, host);
3554
3555 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3556 message_id, host->name, host->address, addrlist->address,
3557 (addrlist->next == NULL)? "" : ", ...");
3558
3559 set_process_info("delivering %s to %s [%s] (%s%s)",
3560 message_id, host->name, host->address, addrlist->address,
3561 (addrlist->next == NULL)? "" : ", ...");
3562
3563 /* This is not for real; don't do the delivery. If there are
3564 any remaining hosts, list them. */
3565
3566 if (dont_deliver)
3567 {
3568 host_item *host2;
895fbaf2 3569 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
0756eb3c
PH		 3570 for (addr = addrlist; addr != NULL; addr = addr->next)
3571 {
3572 addr->host_used = host;
3573 addr->special_action = '*';
3574 addr->message = US"delivery bypassed by -N option";
3575 }
3576 DEBUG(D_transport)
3577 {
3578 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3579 "*** host and remaining hosts:\n", tblock->name);
3580 for (host2 = host; host2 != NULL; host2 = host2->next)
3581 debug_printf(" %s [%s]\n", host2->name,
3582 (host2->address == NULL)? US"unset" : host2->address);
3583 }
3584 rc = OK;
3585 }
3586
3587 /* This is for real. If the host is expired, we don't count it for
3588 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3589 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3590 lunatic DNS configurations) is reached.
8e669ac1 3591
533244af
PH		 3592 If the host is not expired and we are about to hit the hosts_max_retry
3593 limit, check to see if there is a subsequent hosts with a different MX
3594 value. If so, make that the next host, and don't count this one. This is a
3595 heuristic to make sure that different MXs do get tried. With a normal kind
3596 of retry rule, they would get tried anyway when the earlier hosts were
3597 delayed, but if the domain has a "retry every time" type of rule - as is
3598 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH		 3599
3600 else
3601 {
d427a7f9
JH		 3602 host_item * thost;
3603 /* Make a copy of the host if it is local to this invocation
3604 of the transport. */
3605
3606 if (expanded_hosts)
3607 {
3608 thost = store_get(sizeof(host_item));
3609 *thost = *host;
3610 thost->name = string_copy(host->name);
3611 thost->address = string_copy(host->address);
3612 }
3613 else
3614 thost = host;
3615
0756eb3c
PH		 3616 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3617 {
3618 host_item *h;
3619 DEBUG(D_transport)
3620 debug_printf("hosts_max_try limit reached with this host\n");
1a47b633
JH		 3621 for (h = host; h; h = h->next) if (h->mx != host->mx)
3622 {
3623 nexthost = h;
3624 unexpired_hosts_tried--;
3625 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3626 "and will be tried\n");
3627 break;
3628 }
0756eb3c
PH		 3629 }
3630
3631 /* Attempt the delivery. */
3632
533244af 3633 total_hosts_tried++;
d427a7f9
JH		 3634 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3635 &message_defer, FALSE);
0756eb3c
PH		 3636
3637 /* Yield is one of:
3638 OK => connection made, each address contains its result;
3639 message_defer is set for message-specific defers (when all
3640 recipients are marked defer)
3641 DEFER => there was a non-message-specific delivery problem;
3642 ERROR => there was a problem setting up the arguments for a filter,
3643 or there was a problem with expanding added headers
3644 */
3645
3646 /* If the result is not OK, there was a non-message-specific problem.
3647 If the result is DEFER, we need to write to the logs saying what happened
3648 for this particular host, except in the case of authentication and TLS
3649 failures, where the log has already been written. If all hosts defer a
3650 general message is written at the end. */
3651
3652 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3653 first_addr->basic_errno != ERRNO_TLSFAILURE)
3654 write_logs(first_addr, host);
3655
774ef2d7 3656#ifdef EXPERIMENTAL_EVENT
d68218c7 3657 if (rc == DEFER)
774ef2d7 3658 deferred_event_raise(first_addr, host);
a7538db1 3659#endif
d68218c7 3660
0756eb3c
PH		 3661 /* If STARTTLS was accepted, but there was a failure in setting up the
3662 TLS session (usually a certificate screwup), and the host is not in
3663 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3664 TLS forcibly turned off. We have to start from scratch with a new SMTP
3665 connection. That's why the retry is done from here, not from within
3666 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3667 session, so the in-clear transmission after those errors, if permitted,
3668 happens inside smtp_deliver().] */
3669
a7538db1 3670#ifdef SUPPORT_TLS
7a31d643
JH		 3671 if ( rc == DEFER
3672 && first_addr->basic_errno == ERRNO_TLSFAILURE
3673 && ob->tls_tempfail_tryclear
5130845b 3674 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
7a31d643 3675 )
0756eb3c
PH		 3676 {
3677 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3678 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3679 first_addr = prepare_addresses(addrlist, host);
d427a7f9
JH		 3680 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3681 &message_defer, TRUE);
0756eb3c
PH		 3682 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3683 write_logs(first_addr, host);
774ef2d7 3684# ifdef EXPERIMENTAL_EVENT
d68218c7 3685 if (rc == DEFER)
774ef2d7 3686 deferred_event_raise(first_addr, host);
a7538db1 3687# endif
0756eb3c 3688 }
a1bccd48 3689#endif /*SUPPORT_TLS*/
0756eb3c
PH		 3690 }
3691
3692 /* Delivery attempt finished */
3693
3694 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3695 US"ERROR" : US"?";
3696
3697 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3698 message_id, host->name, host->address, addrlist->address,
3699 (addrlist->next == NULL)? "" : " (& others)", rs);
3700
3701 /* Release serialization if set up */
3702
3703 if (serialized) enq_end(serialize_key);
3704
3705 /* If the result is DEFER, or if a host retry record is known to exist, we
3706 need to add an item to the retry chain for updating the retry database
3707 at the end of delivery. We only need to add the item to the top address,
3708 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3709 for any other delivery attempts using the same address. (It is copied into
3710 the unusable tree at the outer level, so even if different address blocks
3711 contain the same address, it still won't get tried again.) */
3712
3713 if (rc == DEFER || retry_host_key != NULL)
3714 {
3715 int delete_flag = (rc != DEFER)? rf_delete : 0;
3716 if (retry_host_key == NULL)
3717 {
9c695f6d
JH		 3718 BOOL incl_ip;
3719 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3720 US"retry_include_ip_address", ob->retry_include_ip_address,
3721 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3722 incl_ip = TRUE; /* error; use most-specific retry record */
3723
3724 retry_host_key = incl_ip ?
0756eb3c
PH		 3725 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3726 string_sprintf("T:%S%s", host->name, pistring);
3727 }
3728
3729 /* If a delivery of another message over an existing SMTP connection
3730 yields DEFER, we do NOT set up retry data for the host. This covers the
3731 case when there are delays in routing the addresses in the second message
3732 that are so long that the server times out. This is alleviated by not
3733 routing addresses that previously had routing defers when handling an
3734 existing connection, but even so, this case may occur (e.g. if a
3735 previously happily routed address starts giving routing defers). If the
3736 host is genuinely down, another non-continued message delivery will
3737 notice it soon enough. */
3738
3739 if (delete_flag != 0 || !continuing)
3740 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3741
3742 /* We may have tried an expired host, if its retry time has come; ensure
3743 the status reflects the expiry for the benefit of any other addresses. */
3744
3745 if (rc == DEFER)
3746 {
3747 host->status = (host_is_expired)?
3748 hstatus_unusable_expired : hstatus_unusable;
3749 host->why = hwhy_deferred;
3750 }
3751 }
3752
3753 /* If message_defer is set (host was OK, but every recipient got deferred
3754 because of some message-specific problem), or if that had happened
3755 previously so that a message retry key exists, add an appropriate item
3756 to the retry chain. Note that if there was a message defer but now there is
3757 a host defer, the message defer record gets deleted. That seems perfectly
3758 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3759 for specific hosts. */
0756eb3c
PH		 3760
3761 if (message_defer || retry_message_key != NULL)
3762 {
3763 int delete_flag = message_defer? 0 : rf_delete;
3764 if (retry_message_key == NULL)
3765 {
9c695f6d
JH		 3766 BOOL incl_ip;
3767 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3768 US"retry_include_ip_address", ob->retry_include_ip_address,
3769 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3770 incl_ip = TRUE; /* error; use most-specific retry record */
3771
3772 retry_message_key = incl_ip ?
0756eb3c
PH		 3773 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3774 message_id) :
3775 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3776 }
3777 retry_add_item(addrlist, retry_message_key,
3778 rf_message | rf_host | delete_flag);
f6c332bd 3779 update_waiting = FALSE;
0756eb3c
PH		 3780 }
3781
3782 /* Any return other than DEFER (that is, OK or ERROR) means that the
3783 addresses have got their final statuses filled in for this host. In the OK
3784 case, see if any of them are deferred. */
3785
3786 if (rc == OK)
4cea764f 3787 for (addr = addrlist; addr; addr = addr->next)
0756eb3c
PH		 3788 if (addr->transport_return == DEFER)
3789 {
3790 some_deferred = TRUE;
3791 break;
3792 }
0756eb3c
PH		 3793
3794 /* If no addresses deferred or the result was ERROR, return. We do this for
3795 ERROR because a failing filter set-up or add_headers expansion is likely to
3796 fail for any host we try. */
3797
3798 if (rc == ERROR || (rc == OK && !some_deferred))
3799 {
3800 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3801 return TRUE; /* Each address has its status */
3802 }
3803
3804 /* If the result was DEFER or some individual addresses deferred, let
3805 the loop run to try other hosts with the deferred addresses, except for the
3806 case when we were trying to deliver down an existing channel and failed.
3807 Don't try any other hosts in this case. */
3808
3809 if (continuing) break;
3810
3811 /* If the whole delivery, or some individual addresses, were deferred and
3812 there are more hosts that could be tried, do not count this host towards
3813 the hosts_max_try limit if the age of the message is greater than the
3814 maximum retry time for this host. This means we may try try all hosts,
3815 ignoring the limit, when messages have been around for some time. This is
3816 important because if we don't try all hosts, the address will never time
533244af 3817 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
0756eb3c
PH		 3818
3819 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3820 {
3821 BOOL timedout;
3822 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3823
3824 if (retry != NULL && retry->rules != NULL)
3825 {
3826 retry_rule *last_rule;
3827 for (last_rule = retry->rules;
3828 last_rule->next != NULL;
3829 last_rule = last_rule->next);
3830 timedout = time(NULL) - received_time > last_rule->timeout;
3831 }
3832 else timedout = TRUE; /* No rule => timed out */
3833
3834 if (timedout)
3835 {
3836 unexpired_hosts_tried--;
3837 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3838 "hosts_max_try (message older than host's retry time)\n");
3839 }
3840 }
3841 } /* End of loop for trying multiple hosts. */
3842
3843 /* This is the end of the loop that repeats iff expired is TRUE and
3844 ob->delay_after_cutoff is FALSE. The second time round we will
3845 try those hosts that haven't been tried since the message arrived. */
3846
3847 DEBUG(D_transport)
3848 {
3849 debug_printf("all IP addresses skipped or deferred at least one address\n");
3850 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3851 debug_printf("retrying IP addresses not tried since message arrived\n");
3852 }
3853 }
3854
3855
3856/* Get here if all IP addresses are skipped or defer at least one address. In
3857MUA wrapper mode, this will happen only for connection or other non-message-
3858specific failures. Force the delivery status for all addresses to FAIL. */
3859
3860if (mua_wrapper)
3861 {
3862 for (addr = addrlist; addr != NULL; addr = addr->next)
3863 addr->transport_return = FAIL;
3864 goto END_TRANSPORT;
3865 }
3866
3867/* In the normal, non-wrapper case, add a standard message to each deferred
3868address if there hasn't been an error, that is, if it hasn't actually been
3869tried this time. The variable "expired" will be FALSE if any deliveries were
3870actually tried, or if there was at least one host that was not expired. That
3871is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3872a delivery has been tried, an error code will be set, and the failing of the
3873message is handled by the retry code later.
3874
3875If queue_smtp is set, or this transport was called to send a subsequent message
3876down an existing TCP/IP connection, and something caused the host not to be
3877found, we end up here, but can detect these cases and handle them specially. */
3878
3879for (addr = addrlist; addr != NULL; addr = addr->next)
3880 {
3881 /* If host is not NULL, it means that we stopped processing the host list
533244af
PH		 3882 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3883 means we need to behave as if some hosts were skipped because their retry
3884 time had not come. Specifically, this prevents the address from timing out.
8e669ac1 3885 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
533244af 3886 hosts were tried. */
0756eb3c
PH		 3887
3888 if (host != NULL)
3889 {
533244af
PH		 3890 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3891 {
3892 DEBUG(D_transport)
3893 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3894 "hosts were tried\n");
3895 }
3896 else
8e669ac1 3897 {
533244af
PH		 3898 DEBUG(D_transport)
3899 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3900 setflag(addr, af_retry_skipped);
8e669ac1 3901 }
0756eb3c
PH		 3902 }
3903
3904 if (queue_smtp) /* no deliveries attempted */
3905 {
3906 addr->transport_return = DEFER;
3907 addr->basic_errno = 0;
3908 addr->message = US"SMTP delivery explicitly queued";
3909 }
3910
3911 else if (addr->transport_return == DEFER &&
3912 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3913 addr->message == NULL)
3914 {
3915 addr->basic_errno = ERRNO_HRETRY;
3916 if (continue_hostname != NULL)
3917 {
3918 addr->message = US"no host found for existing SMTP connection";
3919 }
3920 else if (expired)
3921 {
fffffe4c 3922 setflag(addr, af_pass_message); /* This is not a security risk */
0756eb3c
PH		 3923 addr->message = (ob->delay_after_cutoff)?
3924 US"retry time not reached for any host after a long failure period" :
3925 US"all hosts have been failing for a long time and were last tried "
3926 "after this message arrived";
3927
3928 /* If we are already using fallback hosts, or there are no fallback hosts
3929 defined, convert the result to FAIL to cause a bounce. */
3930
3931 if (addr->host_list == addr->fallback_hosts ||
3932 addr->fallback_hosts == NULL)
3933 addr->transport_return = FAIL;
3934 }
3935 else
3936 {
3937 if (hosts_retry == hosts_total)
3938 addr->message = US"retry time not reached for any host";
3939 else if (hosts_fail == hosts_total)
3940 addr->message = US"all host address lookups failed permanently";
3941 else if (hosts_defer == hosts_total)
3942 addr->message = US"all host address lookups failed temporarily";
3943 else if (hosts_serial == hosts_total)
3944 addr->message = US"connection limit reached for all hosts";
3945 else if (hosts_fail+hosts_defer == hosts_total)
3946 addr->message = US"all host address lookups failed";
3947 else addr->message = US"some host address lookups failed and retry time "
3948 "not reached for other hosts or connection limit reached";
3949 }
3950 }
3951 }
3952
3953/* Update the database which keeps information about which messages are waiting
f6c332bd
PH		 3954for which hosts to become available. For some message-specific errors, the
3955update_waiting flag is turned off because we don't want follow-on deliveries in
ea722490 3956those cases. If this transport instance is explicitly limited to one message
8b260705
PP		 3957per connection then follow-on deliveries are not possible and there's no need
3958to create/update the per-transport wait-<transport_name> database. */
0756eb3c 3959
ea722490
JH		 3960if (update_waiting && tblock->connection_max_messages != 1)
3961 transport_update_waiting(hostlist, tblock->name);
0756eb3c
PH		 3962
3963END_TRANSPORT:
3964
3965DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3966
3967return TRUE; /* Each address has its status */
3968}
3969
578897ea
JH		 3970/* vi: aw ai sw=2
3971*/
0756eb3c 3972/* End of transport/smtp.c */
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