List separator specifiers in router/transport headers_add/remove. Bug 1581
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
5a66c31b 5/* Copyright (c) University of Cambridge 1995 - 2014 */
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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[] = {
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22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
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24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
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27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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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) },
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33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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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
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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
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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) },
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63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
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67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
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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. */
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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
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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) },
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92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 94#ifdef SUPPORT_TLS
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95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 97#endif
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98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 102#ifdef SUPPORT_TLS
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103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 105#endif
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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)
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111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113#endif
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114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 116#ifdef SUPPORT_TLS
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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
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122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124# endif
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125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 127#endif
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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)
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131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133#endif
8ccd00b1 134#ifndef DISABLE_PRDR
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135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137#endif
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138#ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141#endif
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142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
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146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
506900af 150 { "multi_domain", opt_expand_bool | opt_public,
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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,
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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) }
80a47a2c 162#ifdef SUPPORT_TLS
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163 ,{ "tls_certificate", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
165 { "tls_crl", opt_stringptr,
166 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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167 { "tls_dh_min_bits", opt_int,
168 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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169 { "tls_privatekey", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 171 { "tls_require_ciphers", opt_stringptr,
0756eb3c 172 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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173 { "tls_sni", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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175 { "tls_tempfail_tryclear", opt_bool,
176 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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177 { "tls_try_verify_hosts", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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179 { "tls_verify_cert_hostnames", opt_stringptr,
180 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 181 { "tls_verify_certificates", opt_stringptr,
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182 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
183 { "tls_verify_hosts", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 185#endif
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186};
187
188/* Size of the options list. An extern variable has to be used so that its
189address can appear in the tables drtables.c. */
190
191int smtp_transport_options_count =
192 sizeof(smtp_transport_options)/sizeof(optionlist);
193
194/* Default private options block for the smtp transport. */
195
196smtp_transport_options_block smtp_transport_option_defaults = {
197 NULL, /* hosts */
198 NULL, /* fallback_hosts */
199 NULL, /* hostlist */
200 NULL, /* fallback_hostlist */
201 NULL, /* authenticated_sender */
202 US"$primary_hostname", /* helo_data */
203 NULL, /* interface */
204 NULL, /* port */
205 US"smtp", /* protocol */
9e4f5962 206 NULL, /* DSCP */
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207 NULL, /* serialize_hosts */
208 NULL, /* hosts_try_auth */
209 NULL, /* hosts_require_auth */
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210#ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
7a31d643 212 NULL, /* hosts_require_dane */
96e47838 213#endif
8ccd00b1 214#ifndef DISABLE_PRDR
ad07e9ad 215 US"*", /* hosts_try_prdr */
fd98a5c6 216#endif
f2de3a33 217#ifndef DISABLE_OCSP
0e66b3b6 218 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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219 NULL, /* hosts_require_ocsp */
220#endif
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221 NULL, /* hosts_require_tls */
222 NULL, /* hosts_avoid_tls */
99400968 223 US"*", /* hosts_verify_avoid_tls */
c51b8e75 224 NULL, /* hosts_avoid_pipelining */
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225 NULL, /* hosts_avoid_esmtp */
226 NULL, /* hosts_nopass_tls */
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
8e669ac1 233 50, /* hosts_max_try_hardlimit */
48c7f9e2 234 TRUE, /* address_retry_include_sender */
0756eb3c 235 FALSE, /* allow_localhost */
382afc6b 236 FALSE, /* authenticated_sender_force */
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237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
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240 NULL, /* dnssec_request_domains */
241 NULL, /* dnssec_require_domains */
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242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
f1513293 246 FALSE, /* lmtp_ignore_quota */
9c695f6d 247 NULL, /* expand_retry_include_ip_address */
0756eb3c 248 TRUE /* retry_include_ip_address */
80a47a2c 249#ifdef SUPPORT_TLS
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250 ,NULL, /* tls_certificate */
251 NULL, /* tls_crl */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
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254 NULL, /* gnutls_require_kx */
255 NULL, /* gnutls_require_mac */
256 NULL, /* gnutls_require_proto */
54c90be1 257 NULL, /* tls_sni */
0e0f3f56 258 US"system", /* tls_verify_certificates */
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259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
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261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
610ff438 263 US"*", /* tls_try_verify_hosts */
01a4a5c5 264 US"*" /* tls_verify_cert_hostnames */
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265#endif
266#ifndef DISABLE_DKIM
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267 ,NULL, /* dkim_canon */
268 NULL, /* dkim_domain */
269 NULL, /* dkim_private_key */
270 NULL, /* dkim_selector */
271 NULL, /* dkim_sign_headers */
272 NULL /* dkim_strict */
80a47a2c 273#endif
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274};
275
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276/* some DSN flags for use later */
277
278static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
280
45500060 281static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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282
283
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284
285/* Local statics */
286
287static uschar *smtp_command; /* Points to last cmd for error messages */
288static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 289static BOOL update_waiting; /* TRUE to update the "wait" database */
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290
291
292/*************************************************
293* Setup entry point *
294*************************************************/
295
296/* This function is called when the transport is about to be used,
297but before running it in a sub-process. It is used for two things:
298
299 (1) To set the fallback host list in addresses, when delivering.
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300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
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302
303Arguments:
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
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307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
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309 errmsg place for error message (not used)
310
311Returns: OK always (FAIL, DEFER not used)
312*/
313
314static int
315smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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317{
318smtp_transport_options_block *ob =
319 (smtp_transport_options_block *)(tblock->options_block);
320
321errmsg = errmsg; /* Keep picky compilers happy */
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322uid = uid;
323gid = gid;
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324
325/* Pass back options if required. This interface is getting very messy. */
326
327if (tf != NULL)
328 {
329 tf->interface = ob->interface;
330 tf->port = ob->port;
331 tf->protocol = ob->protocol;
332 tf->hosts = ob->hosts;
333 tf->hosts_override = ob->hosts_override;
334 tf->hosts_randomize = ob->hosts_randomize;
335 tf->gethostbyname = ob->gethostbyname;
336 tf->qualify_single = ob->dns_qualify_single;
337 tf->search_parents = ob->dns_search_parents;
26da7e20 338 tf->helo_data = ob->helo_data;
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339 }
340
341/* Set the fallback host list for all the addresses that don't have fallback
342host lists, provided that the local host wasn't present in the original host
343list. */
344
345if (!testflag(addrlist, af_local_host_removed))
346 {
347 for (; addrlist != NULL; addrlist = addrlist->next)
348 if (addrlist->fallback_hosts == NULL)
349 addrlist->fallback_hosts = ob->fallback_hostlist;
350 }
351
352return OK;
353}
354
355
356
357/*************************************************
358* Initialization entry point *
359*************************************************/
360
361/* Called for each instance, after its options have been read, to
362enable consistency checks to be done, or anything else that needs
363to be set up.
364
365Argument: pointer to the transport instance block
366Returns: nothing
367*/
368
369void
370smtp_transport_init(transport_instance *tblock)
371{
372smtp_transport_options_block *ob =
373 (smtp_transport_options_block *)(tblock->options_block);
374
375/* Retry_use_local_part defaults FALSE if unset */
376
377if (tblock->retry_use_local_part == TRUE_UNSET)
378 tblock->retry_use_local_part = FALSE;
379
380/* Set the default port according to the protocol */
381
382if (ob->port == NULL)
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383 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
384 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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385
386/* Set up the setup entry point, to be called before subprocesses for this
387transport. */
388
389tblock->setup = smtp_transport_setup;
390
391/* Complain if any of the timeouts are zero. */
392
393if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
394 ob->final_timeout <= 0)
395 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
396 "command, data, or final timeout value is zero for %s transport",
397 tblock->name);
398
399/* If hosts_override is set and there are local hosts, set the global
400flag that stops verify from showing router hosts. */
401
402if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
403
404/* If there are any fallback hosts listed, build a chain of host items
405for them, but do not do any lookups at this time. */
406
407host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 408
32d07012 409#ifdef SUPPORT_TLS
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410if ( ob->gnutls_require_kx
411 || ob->gnutls_require_mac
412 || ob->gnutls_require_proto)
413 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
414 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
415 " are obsolete\n");
32d07012 416#endif
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417}
418
419
420
421
422
423/*************************************************
424* Set delivery info into all active addresses *
425*************************************************/
426
427/* Only addresses whose status is >= PENDING are relevant. A lesser
428status means that an address is not currently being processed.
429
430Arguments:
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431 addrlist points to a chain of addresses
432 errno_value to put in each address's errno field
433 msg to put in each address's message field
434 rc to put in each address's transport_return field
435 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 436 host if set, mark addrs as having used this host
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437
438If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
439the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
440this particular type of timeout.
441
442Returns: nothing
443*/
444
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445static void
446set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
c562fd30 447 BOOL pass_message, host_item * host)
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448{
449address_item *addr;
450int orvalue = 0;
451if (errno_value == ERRNO_CONNECTTIMEOUT)
452 {
453 errno_value = ETIMEDOUT;
454 orvalue = RTEF_CTOUT;
455 }
456for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b 457 if (addr->transport_return >= PENDING)
447d236c 458 {
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459 addr->basic_errno = errno_value;
460 addr->more_errno |= orvalue;
461 if (msg != NULL)
462 {
463 addr->message = msg;
464 if (pass_message) setflag(addr, af_pass_message);
465 }
466 addr->transport_return = rc;
467 if (host)
468 addr->host_used = host;
447d236c 469 }
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470}
471
472
473
474/*************************************************
475* Check an SMTP response *
476*************************************************/
477
478/* This function is given an errno code and the SMTP response buffer
479to analyse, together with the host identification for generating messages. It
480sets an appropriate message and puts the first digit of the response code into
481the yield variable. If no response was actually read, a suitable digit is
482chosen.
483
484Arguments:
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485 host the current host, to get its name for messages
486 errno_value pointer to the errno value
487 more_errno from the top address for use with ERRNO_FILTER_FAIL
488 buffer the SMTP response buffer
489 yield where to put a one-digit SMTP response code
490 message where to put an errror message
491 pass_message set TRUE if message is an SMTP response
492
493Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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494*/
495
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496static BOOL
497check_response(host_item *host, int *errno_value, int more_errno,
447d236c 498 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
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499{
500uschar *pl = US"";
501
502if (smtp_use_pipelining &&
503 (Ustrcmp(smtp_command, "MAIL") == 0 ||
504 Ustrcmp(smtp_command, "RCPT") == 0 ||
505 Ustrcmp(smtp_command, "DATA") == 0))
506 pl = US"pipelined ";
507
508*yield = '4'; /* Default setting is to give a temporary error */
509
510/* Handle response timeout */
511
512if (*errno_value == ETIMEDOUT)
513 {
c562fd30
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514 *message = US string_sprintf("SMTP timeout after %s%s",
515 pl, smtp_command);
0756eb3c
PH
516 if (transport_count > 0)
517 *message = US string_sprintf("%s (%d bytes written)", *message,
518 transport_count);
519 return FALSE;
520 }
521
522/* Handle malformed SMTP response */
523
524if (*errno_value == ERRNO_SMTPFORMAT)
525 {
526 uschar *malfresp = string_printing(buffer);
527 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
528 *message = *malfresp == 0
529 ? string_sprintf("Malformed SMTP reply (an empty line) "
530 "in response to %s%s", pl, smtp_command)
531 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
532 pl, smtp_command, malfresp);
0756eb3c
PH
533 return FALSE;
534 }
535
536/* Handle a failed filter process error; can't send QUIT as we mustn't
537end the DATA. */
538
539if (*errno_value == ERRNO_FILTER_FAIL)
540 {
35af9f61 541 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 542 more_errno,
35af9f61 543 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
544 return FALSE;
545 }
546
547/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
548end the DATA. */
549
550if (*errno_value == ERRNO_CHHEADER_FAIL)
551 {
552 *message =
553 US string_sprintf("failed to expand headers_add or headers_remove: %s",
554 expand_string_message);
555 return FALSE;
556 }
557
558/* Handle failure to write a complete data block */
559
560if (*errno_value == ERRNO_WRITEINCOMPLETE)
561 {
562 *message = US string_sprintf("failed to write a data block");
563 return FALSE;
564 }
565
566/* Handle error responses from the remote mailer. */
567
568if (buffer[0] != 0)
569 {
570 uschar *s = string_printing(buffer);
447d236c 571 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 572 "%s", pl, smtp_command, s);
447d236c 573 *pass_message = TRUE;
0756eb3c
PH
574 *yield = buffer[0];
575 return TRUE;
576 }
577
578/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
579connection closed) case, which causes deferral. An explicit connection reset
580error has the same effect. Otherwise, put the host's identity in the message,
581leaving the errno value to be interpreted as well. In all cases, we have to
582assume the connection is now dead. */
0756eb3c 583
19b9dc85 584if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
585 {
586 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
587 *message = US string_sprintf("Remote host closed connection "
588 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
589 }
590else *message = US string_sprintf("%s [%s]", host->name, host->address);
591
592return FALSE;
593}
594
595
596
597/*************************************************
598* Write error message to logs *
599*************************************************/
600
601/* This writes to the main log and to the message log.
602
603Arguments:
604 addr the address item containing error information
605 host the current host
606
607Returns: nothing
608*/
609
610static void
611write_logs(address_item *addr, host_item *host)
612{
c562fd30
JH
613uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
614
615if (addr->message)
0756eb3c 616 {
c562fd30 617 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
618 if (addr->basic_errno > 0)
619 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
620 log_write(0, LOG_MAIN, "%s", message);
621 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
622 }
623else
624 {
c562fd30
JH
625 if (log_extra_selector & LX_outgoing_port)
626 message = string_sprintf("%s:%d", message,
627 host->port == PORT_NONE ? 25 : host->port);
628 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
629 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
630 strerror(addr->basic_errno));
0756eb3c
PH
631 }
632}
633
c562fd30
JH
634static void
635msglog_line(host_item * host, uschar * message)
636{
637 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
638 host->name, host->address, message);
639}
640
0756eb3c
PH
641
642
774ef2d7 643#ifdef EXPERIMENTAL_EVENT
d68218c7
JH
644/*************************************************
645* Post-defer action *
646*************************************************/
647
648/* This expands an arbitrary per-transport string.
649 It might, for example, be used to write to the database log.
650
651Arguments:
d68218c7
JH
652 addr the address item containing error information
653 host the current host
654
655Returns: nothing
656*/
657
658static void
774ef2d7 659deferred_event_raise(address_item *addr, host_item *host)
d68218c7 660{
774ef2d7 661uschar * action = addr->transport->event_action;
a7538db1
JH
662uschar * save_domain;
663uschar * save_local;
664
d68218c7 665if (!action)
a7538db1 666 return;
d68218c7 667
a7538db1
JH
668save_domain = deliver_domain;
669save_local = deliver_localpart;
670
671/*XXX would ip & port already be set up? */
672deliver_host_address = string_copy(host->address);
774ef2d7
JH
673deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
674event_defer_errno = addr->basic_errno;
d68218c7
JH
675
676router_name = addr->router->name;
677transport_name = addr->transport->name;
a7538db1
JH
678deliver_domain = addr->domain;
679deliver_localpart = addr->local_part;
680
774ef2d7 681(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
682 addr->message
683 ? addr->basic_errno > 0
684 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
685 : string_copy(addr->message)
686 : addr->basic_errno > 0
687 ? string_copy(US strerror(addr->basic_errno))
688 : NULL);
689
690deliver_localpart = save_local;
691deliver_domain = save_domain;
d68218c7
JH
692router_name = transport_name = NULL;
693}
694#endif
695
696
697
0756eb3c
PH
698/*************************************************
699* Synchronize SMTP responses *
700*************************************************/
701
702/* This function is called from smtp_deliver() to receive SMTP responses from
703the server, and match them up with the commands to which they relate. When
704PIPELINING is not in use, this function is called after every command, and is
705therefore somewhat over-engineered, but it is simpler to use a single scheme
706that works both with and without PIPELINING instead of having two separate sets
707of code.
708
709The set of commands that are buffered up with pipelining may start with MAIL
710and may end with DATA; in between are RCPT commands that correspond to the
711addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
712etc.) are never buffered.
713
714Errors after MAIL or DATA abort the whole process leaving the response in the
715buffer. After MAIL, pending responses are flushed, and the original command is
716re-instated in big_buffer for error messages. For RCPT commands, the remote is
717permitted to reject some recipient addresses while accepting others. However
718certain errors clearly abort the whole process. Set the value in
719transport_return to PENDING_OK if the address is accepted. If there is a
720subsequent general error, it will get reset accordingly. If not, it will get
721converted to OK at the end.
722
723Arguments:
48c7f9e2
PH
724 addrlist the complete address list
725 include_affixes TRUE if affixes include in RCPT
726 sync_addr ptr to the ptr of the one to start scanning at (updated)
727 host the host we are connected to
728 count the number of responses to read
729 address_retry_
730 include_sender true if 4xx retry is to include the sender it its key
731 pending_MAIL true if the first response is for MAIL
732 pending_DATA 0 if last command sent was not DATA
733 +1 if previously had a good recipient
734 -1 if not previously had a good recipient
735 inblock incoming SMTP block
736 timeout timeout value
737 buffer buffer for reading response
738 buffsize size of buffer
0756eb3c
PH
739
740Returns: 3 if at least one address had 2xx and one had 5xx
741 2 if at least one address had 5xx but none had 2xx
742 1 if at least one host had a 2xx response, but none had 5xx
743 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
744 -1 timeout while reading RCPT response
745 -2 I/O or other non-response error for RCPT
746 -3 DATA or MAIL failed - errno and buffer set
747*/
748
749static int
750sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
751 address_item **sync_addr, host_item *host, int count,
752 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
753 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
754 int buffsize)
755{
756address_item *addr = *sync_addr;
757int yield = 0;
758
759/* Handle the response for a MAIL command. On error, reinstate the original
760command in big_buffer for error message use, and flush any further pending
761responses before returning, except after I/O errors and timeouts. */
762
763if (pending_MAIL)
764 {
765 count--;
766 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
767 {
768 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
769 if (errno == 0 && buffer[0] != 0)
770 {
771 uschar flushbuffer[4096];
e97957bc
PH
772 int save_errno = 0;
773 if (buffer[0] == '4')
774 {
775 save_errno = ERRNO_MAIL4XX;
776 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
777 }
0756eb3c
PH
778 while (count-- > 0)
779 {
780 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
781 '2', timeout)
782 && (errno != 0 || flushbuffer[0] == 0))
783 break;
784 }
e97957bc 785 errno = save_errno;
0756eb3c 786 }
c562fd30
JH
787
788 if (pending_DATA) count--; /* Number of RCPT responses to come */
789 while (count-- > 0) /* Mark any pending addrs with the host used */
790 {
791 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
792 addr->host_used = host;
793 addr = addr->next;
794 }
0756eb3c
PH
795 return -3;
796 }
797 }
798
799if (pending_DATA) count--; /* Number of RCPT responses to come */
800
801/* Read and handle the required number of RCPT responses, matching each one up
802with an address by scanning for the next address whose status is PENDING_DEFER.
803*/
804
805while (count-- > 0)
806 {
807 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
808
809 /* The address was accepted */
c562fd30 810 addr->host_used = host;
0756eb3c
PH
811
812 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
813 {
814 yield |= 1;
815 addr->transport_return = PENDING_OK;
816
817 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
818 ensure that any address-specific retry record is expunged. We do this both
819 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
820
821 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
822 {
823 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
824 sender_address);
825 retry_add_item(addr, altkey, rf_delete);
0756eb3c 826 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 827 }
0756eb3c
PH
828 }
829
830 /* Timeout while reading the response */
831
832 else if (errno == ETIMEDOUT)
833 {
c562fd30
JH
834 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
835 transport_rcpt_address(addr, include_affixes));
168dec3b 836 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
0756eb3c 837 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 838 update_waiting = FALSE;
0756eb3c
PH
839 return -1;
840 }
841
842 /* Handle other errors in obtaining an SMTP response by returning -1. This
843 will cause all the addresses to be deferred. Restore the SMTP command in
844 big_buffer for which we are checking the response, so the error message
845 makes sense. */
846
847 else if (errno != 0 || buffer[0] == 0)
848 {
849 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 return -2;
852 }
853
854 /* Handle SMTP permanent and temporary response codes. */
855
856 else
857 {
858 addr->message =
447d236c 859 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
860 "%s", transport_rcpt_address(addr, include_affixes),
861 string_printing(buffer));
447d236c 862 setflag(addr, af_pass_message);
c562fd30 863 msglog_line(host, addr->message);
0756eb3c
PH
864
865 /* The response was 5xx */
866
867 if (buffer[0] == '5')
868 {
869 addr->transport_return = FAIL;
870 yield |= 2;
871 }
872
873 /* The response was 4xx */
874
875 else
876 {
0756eb3c
PH
877 addr->transport_return = DEFER;
878 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 879 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 880
c562fd30
JH
881 /* Log temporary errors if there are more hosts to be tried.
882 If not, log this last one in the == line. */
0756eb3c 883
c562fd30
JH
884 if (host->next)
885 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 886
f6c332bd
PH
887 /* Do not put this message on the list of those waiting for specific
888 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 889
f6c332bd 890 update_waiting = FALSE;
0756eb3c 891
48c7f9e2
PH
892 /* Add a retry item for the address so that it doesn't get tried again
893 too soon. If address_retry_include_sender is true, add the sender address
894 to the retry key. */
0756eb3c 895
48c7f9e2
PH
896 if (address_retry_include_sender)
897 {
898 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
899 sender_address);
900 retry_add_item(addr, altkey, 0);
901 }
902 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
903 }
904 }
905 } /* Loop for next RCPT response */
906
907/* Update where to start at for the next block of responses, unless we
908have already handled all the addresses. */
909
910if (addr != NULL) *sync_addr = addr->next;
911
912/* Handle a response to DATA. If we have not had any good recipients, either
913previously or in this block, the response is ignored. */
914
915if (pending_DATA != 0 &&
916 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
917 {
918 int code;
919 uschar *msg;
447d236c 920 BOOL pass_message;
e97957bc
PH
921 if (pending_DATA > 0 || (yield & 1) != 0)
922 {
923 if (errno == 0 && buffer[0] == '4')
924 {
925 errno = ERRNO_DATA4XX;
926 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
927 }
928 return -3;
929 }
447d236c 930 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
931 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
932 "is in use and there were no good recipients\n", msg);
933 }
934
935/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
936present) received 3xx. If any RCPTs were handled and yielded anything other
937than 4xx, yield will be set non-zero. */
938
939return yield;
940}
941
942
943
fcc8e047
JH
944/* Do the client side of smtp-level authentication */
945/*
946Arguments:
947 buffer EHLO response from server (gets overwritten)
948 addrlist chain of potential addresses to deliver
949 host host to deliver to
950 ob transport options
951 ibp, obp comms channel control blocks
952
953Returns:
954 OK Success, or failed (but not required): global "smtp_authenticated" set
955 DEFER Failed authentication (and was required)
956 ERROR Internal problem
957
958 FAIL_SEND Failed communications - transmit
959 FAIL - response
960*/
961
962int
963smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
964 smtp_transport_options_block *ob, BOOL is_esmtp,
965 smtp_inblock *ibp, smtp_outblock *obp)
966{
a7538db1
JH
967int require_auth;
968uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 969
a7538db1
JH
970smtp_authenticated = FALSE;
971client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 972require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 973
a7538db1
JH
974if (is_esmtp && !regex_AUTH) regex_AUTH =
975 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
976 FALSE, TRUE);
fcc8e047 977
a7538db1
JH
978if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
979 {
980 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
981 expand_nmax = -1; /* reset */
fcc8e047 982
a7538db1
JH
983 /* Must not do this check until after we have saved the result of the
984 regex match above. */
fcc8e047 985
a7538db1 986 if (require_auth == OK ||
5130845b 987 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
988 {
989 auth_instance *au;
990 fail_reason = US"no common mechanisms were found";
fcc8e047 991
a7538db1 992 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 993
a7538db1
JH
994 /* Scan the configured authenticators looking for one which is configured
995 for use as a client, which is not suppressed by client_condition, and
996 whose name matches an authentication mechanism supported by the server.
997 If one is found, attempt to authenticate by calling its client function.
998 */
fcc8e047 999
a7538db1
JH
1000 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1001 {
1002 uschar *p = names;
1003 if (!au->client ||
1004 (au->client_condition != NULL &&
1005 !expand_check_condition(au->client_condition, au->name,
1006 US"client authenticator")))
1007 {
1008 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1009 au->name,
1010 (au->client)? "client_condition is false" :
1011 "not configured as a client");
1012 continue;
1013 }
fcc8e047 1014
a7538db1 1015 /* Loop to scan supported server mechanisms */
fcc8e047 1016
a7538db1
JH
1017 while (*p != 0)
1018 {
1019 int rc;
1020 int len = Ustrlen(au->public_name);
1021 while (isspace(*p)) p++;
fcc8e047 1022
a7538db1
JH
1023 if (strncmpic(au->public_name, p, len) != 0 ||
1024 (p[len] != 0 && !isspace(p[len])))
1025 {
1026 while (*p != 0 && !isspace(*p)) p++;
1027 continue;
1028 }
fcc8e047 1029
a7538db1
JH
1030 /* Found data for a listed mechanism. Call its client entry. Set
1031 a flag in the outblock so that data is overwritten after sending so
1032 that reflections don't show it. */
fcc8e047 1033
a7538db1
JH
1034 fail_reason = US"authentication attempt(s) failed";
1035 obp->authenticating = TRUE;
1036 rc = (au->info->clientcode)(au, ibp, obp,
1037 ob->command_timeout, buffer, bufsize);
1038 obp->authenticating = FALSE;
1039 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1040 au->name, rc);
fcc8e047 1041
a7538db1
JH
1042 /* A temporary authentication failure must hold up delivery to
1043 this host. After a permanent authentication failure, we carry on
1044 to try other authentication methods. If all fail hard, try to
1045 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1046
a7538db1
JH
1047 switch(rc)
1048 {
1049 case OK:
1050 smtp_authenticated = TRUE; /* stops the outer loop */
1051 client_authenticator = au->name;
1052 if (au->set_client_id != NULL)
1053 client_authenticated_id = expand_string(au->set_client_id);
1054 break;
1055
1056 /* Failure after writing a command */
1057
1058 case FAIL_SEND:
1059 return FAIL_SEND;
1060
1061 /* Failure after reading a response */
1062
1063 case FAIL:
1064 if (errno != 0 || buffer[0] != '5') return FAIL;
1065 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1066 au->name, host->name, host->address, buffer);
1067 break;
1068
1069 /* Failure by some other means. In effect, the authenticator
1070 decided it wasn't prepared to handle this case. Typically this
1071 is the result of "fail" in an expansion string. Do we need to
1072 log anything here? Feb 2006: a message is now put in the buffer
1073 if logging is required. */
1074
1075 case CANCELLED:
1076 if (*buffer != 0)
1077 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1078 "authentication H=%s [%s] %s", au->name, host->name,
1079 host->address, buffer);
1080 break;
1081
1082 /* Internal problem, message in buffer. */
1083
1084 case ERROR:
168dec3b
JH
1085 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1086 DEFER, FALSE, NULL);
a7538db1
JH
1087 return ERROR;
1088 }
fcc8e047 1089
a7538db1
JH
1090 break; /* If not authenticated, try next authenticator */
1091 } /* Loop for scanning supported server mechanisms */
1092 } /* Loop for further authenticators */
fcc8e047 1093 }
a7538db1 1094 }
fcc8e047 1095
a7538db1 1096/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1097
a7538db1
JH
1098if (require_auth == OK && !smtp_authenticated)
1099 {
1100 set_errno(addrlist, ERRNO_AUTHFAIL,
1101 string_sprintf("authentication required but %s", fail_reason), DEFER,
c562fd30 1102 FALSE, NULL);
a7538db1
JH
1103 return DEFER;
1104 }
4d8d62b9 1105
a7538db1 1106return OK;
fcc8e047
JH
1107}
1108
1109
1110/* Construct AUTH appendix string for MAIL TO */
1111/*
1112Arguments
1113 buffer to build string
1114 addrlist chain of potential addresses to deliver
1115 ob transport options
1116
1117Globals smtp_authenticated
1118 client_authenticated_sender
1119Return True on error, otherwise buffer has (possibly empty) terminated string
1120*/
1121
1122BOOL
1123smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1124 smtp_transport_options_block *ob)
1125{
1126uschar *local_authenticated_sender = authenticated_sender;
1127
1128#ifdef notdef
1129 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1130#endif
1131
1132if (ob->authenticated_sender != NULL)
1133 {
1134 uschar *new = expand_string(ob->authenticated_sender);
1135 if (new == NULL)
1136 {
1137 if (!expand_string_forcedfail)
1138 {
1139 uschar *message = string_sprintf("failed to expand "
1140 "authenticated_sender: %s", expand_string_message);
168dec3b 1141 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
fcc8e047
JH
1142 return TRUE;
1143 }
1144 }
1145 else if (new[0] != 0) local_authenticated_sender = new;
1146 }
1147
1148/* Add the authenticated sender address if present */
1149
1150if ((smtp_authenticated || ob->authenticated_sender_force) &&
1151 local_authenticated_sender != NULL)
1152 {
1153 string_format(buffer, bufsize, " AUTH=%s",
1154 auth_xtextencode(local_authenticated_sender,
1155 Ustrlen(local_authenticated_sender)));
1156 client_authenticated_sender = string_copy(local_authenticated_sender);
1157 }
1158else
1159 *buffer= 0;
1160
1161return FALSE;
1162}
1163
1164
1165
0e66b3b6
JH
1166#ifdef EXPERIMENTAL_DANE
1167int
b8b1b5cb 1168tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH
1169 BOOL dane_required, BOOL * dane)
1170{
1171/* move this out to host.c given the similarity to dns_lookup() ? */
1172uschar buffer[300];
1173uschar * fullname = buffer;
1174
1175/* TLSA lookup string */
1176(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1177
1178switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1179 {
1180 case DNS_AGAIN:
1181 return DEFER; /* just defer this TLS'd conn */
1182
1183 default:
1184 case DNS_FAIL:
1185 if (dane_required)
1186 {
1187 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1188 return FAIL;
1189 }
1190 break;
1191
1192 case DNS_SUCCEED:
1193 if (!dns_is_secure(dnsa))
1194 {
1195 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1196 return DEFER;
1197 }
1198 *dane = TRUE;
1199 break;
1200 }
1201return OK;
1202}
1203#endif
1204
1205
0756eb3c
PH
1206/*************************************************
1207* Deliver address list to given host *
1208*************************************************/
1209
1210/* If continue_hostname is not null, we get here only when continuing to
1211deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1212input. TLS is never active on a passed channel; the previous process always
1213closes it down before passing the connection on.
0756eb3c
PH
1214
1215Otherwise, we have to make a connection to the remote host, and do the
1216initial protocol exchange.
1217
1218When running as an MUA wrapper, if the sender or any recipient is rejected,
1219temporarily or permanently, we force failure for all recipients.
1220
1221Arguments:
1222 addrlist chain of potential addresses to deliver; only those whose
1223 transport_return field is set to PENDING_DEFER are currently
1224 being processed; others should be skipped - they have either
1225 been delivered to an earlier host or IP address, or been
1226 failed by one of them.
1227 host host to deliver to
1228 host_af AF_INET or AF_INET6
2d280592 1229 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1230 interface interface to bind to, or NULL
1231 tblock transport instance block
0756eb3c
PH
1232 message_defer set TRUE if yield is OK, but all addresses were deferred
1233 because of a non-recipient, non-host failure, that is, a
1234 4xx response to MAIL FROM, DATA, or ".". This is a defer
1235 that is specific to the message.
1236 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1237 a second attempt after TLS initialization fails
1238
1239Returns: OK - the connection was made and the delivery attempted;
1240 the result for each address is in its data block.
1241 DEFER - the connection could not be made, or something failed
1242 while setting up the SMTP session, or there was a
1243 non-message-specific error, such as a timeout.
1244 ERROR - a filter command is specified for this transport,
1245 and there was a problem setting it up; OR helo_data
1246 or add_headers or authenticated_sender is specified
1247 for this transport, and the string failed to expand
1248*/
1249
1250static int
1251smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1252 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1253 BOOL *message_defer, BOOL suppress_tls)
1254{
1255address_item *addr;
1256address_item *sync_addr;
1257address_item *first_addr = addrlist;
1258int yield = OK;
1259int address_count;
1260int save_errno;
1261int rc;
1262time_t start_delivery_time = time(NULL);
1263smtp_transport_options_block *ob =
1264 (smtp_transport_options_block *)(tblock->options_block);
1265BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1266BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1267BOOL ok = FALSE;
1268BOOL send_rset = TRUE;
1269BOOL send_quit = TRUE;
1270BOOL setting_up = TRUE;
1271BOOL completed_address = FALSE;
1272BOOL esmtp = TRUE;
1273BOOL pending_MAIL;
447d236c 1274BOOL pass_message = FALSE;
8ccd00b1 1275#ifndef DISABLE_PRDR
fd98a5c6
JH
1276BOOL prdr_offered = FALSE;
1277BOOL prdr_active;
1278#endif
6c1c3d1d 1279BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1280#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1281BOOL dane = FALSE;
6ebd79ec 1282BOOL dane_required;
0e66b3b6
JH
1283dns_answer tlsa_dnsa;
1284#endif
0756eb3c
PH
1285smtp_inblock inblock;
1286smtp_outblock outblock;
1287int max_rcpt = tblock->max_addresses;
f1513293 1288uschar *igquotstr = US"";
41c7c167 1289uschar *helo_data = NULL;
0756eb3c
PH
1290uschar *message = NULL;
1291uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1292uschar *p;
1293uschar buffer[4096];
1294uschar inbuffer[4096];
98470202 1295uschar outbuffer[4096];
0756eb3c
PH
1296
1297suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1298
1299*message_defer = FALSE;
1300smtp_command = US"initial connection";
1301if (max_rcpt == 0) max_rcpt = 999999;
1302
1303/* Set up the buffer for reading SMTP response packets. */
1304
1305inblock.buffer = inbuffer;
1306inblock.buffersize = sizeof(inbuffer);
1307inblock.ptr = inbuffer;
1308inblock.ptrend = inbuffer;
1309
1310/* Set up the buffer for holding SMTP commands while pipelining */
1311
1312outblock.buffer = outbuffer;
1313outblock.buffersize = sizeof(outbuffer);
1314outblock.ptr = outbuffer;
1315outblock.cmd_count = 0;
1316outblock.authenticating = FALSE;
1317
6c512171
PH
1318/* Reset the parameters of a TLS session. */
1319
817d9f57
JH
1320tls_out.bits = 0;
1321tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1322tls_out.ourcert = NULL;
1323tls_out.peercert = NULL;
817d9f57
JH
1324tls_out.peerdn = NULL;
1325#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1326tls_out.sni = NULL;
5b456975 1327#endif
018058b2 1328tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1329
35aba663
JH
1330/* Flip the legacy TLS-related variables over to the outbound set in case
1331they're used in the context of the transport. Don't bother resetting
1332afterward as we're in a subprocess. */
1333
1334tls_modify_variables(&tls_out);
1335
061b7ebd
PP
1336#ifndef SUPPORT_TLS
1337if (smtps)
1338 {
168dec3b
JH
1339 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1340 DEFER, FALSE, NULL);
018058b2 1341 return ERROR;
061b7ebd
PP
1342 }
1343#endif
1344
0756eb3c
PH
1345/* Make a connection to the host if this isn't a continued delivery, and handle
1346the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1347specially so they can be identified for retries. */
1348
1349if (continue_hostname == NULL)
1350 {
a7538db1 1351 /* This puts port into host->port */
0756eb3c
PH
1352 inblock.sock = outblock.sock =
1353 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
a7538db1 1354 ob->keepalive, ob->dscp
774ef2d7
JH
1355#ifdef EXPERIMENTAL_EVENT
1356 , tblock->event_action
a7538db1
JH
1357#endif
1358 );
4311097e 1359
0756eb3c
PH
1360 if (inblock.sock < 0)
1361 {
1362 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
c562fd30 1363 NULL, DEFER, FALSE, NULL);
0756eb3c
PH
1364 return DEFER;
1365 }
1366
0e66b3b6
JH
1367#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1368 {
0e66b3b6
JH
1369 tls_out.dane_verified = FALSE;
1370 tls_out.tlsa_usage = 0;
1371
5130845b 1372 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1373
1374 if (host->dnssec == DS_YES)
1375 {
1376 if( dane_required
5130845b 1377 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6
JH
1378 )
1379 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
1380 return rc;
1381 }
1382 else if (dane_required)
1383 {
1384 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1385 return FAIL;
1386 }
1387
1388 if (dane)
1389 ob->tls_tempfail_tryclear = FALSE;
1390 }
1391#endif /*DANE*/
1392
41c7c167
PH
1393 /* Expand the greeting message while waiting for the initial response. (Makes
1394 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1395 delayed till here so that $sending_interface and $sending_port are set. */
1396
1397 helo_data = expand_string(ob->helo_data);
1398
0756eb3c
PH
1399 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1400 is nevertheless a reasonably clean way of programming this kind of logic,
1401 where you want to escape on any error. */
1402
061b7ebd
PP
1403 if (!smtps)
1404 {
1405 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1406 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1407
774ef2d7 1408#ifdef EXPERIMENTAL_EVENT
b30275b8 1409 {
805c9d53
JH
1410 uschar * s;
1411 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1412 : host->dnssec==DS_NO ? US"no" : NULL;
1413 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1414 if (s)
a7538db1 1415 {
168dec3b 1416 set_errno(addrlist, ERRNO_EXPANDFAIL,
b30275b8
JH
1417 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1418 DEFER, FALSE, NULL);
a7538db1
JH
1419 yield = DEFER;
1420 goto SEND_QUIT;
1421 }
b30275b8 1422 }
a7538db1
JH
1423#endif
1424
061b7ebd
PP
1425 /* Now check if the helo_data expansion went well, and sign off cleanly if
1426 it didn't. */
41c7c167 1427
061b7ebd
PP
1428 if (helo_data == NULL)
1429 {
1430 uschar *message = string_sprintf("failed to expand helo_data: %s",
1431 expand_string_message);
168dec3b 1432 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
061b7ebd
PP
1433 yield = DEFER;
1434 goto SEND_QUIT;
1435 }
41c7c167
PH
1436 }
1437
0756eb3c
PH
1438/** Debugging without sending a message
1439addrlist->transport_return = DEFER;
1440goto SEND_QUIT;
1441**/
1442
1443 /* Errors that occur after this point follow an SMTP command, which is
1444 left in big_buffer by smtp_write_command() for use in error messages. */
1445
1446 smtp_command = big_buffer;
1447
1448 /* Tell the remote who we are...
1449
1450 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1451 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1452 greeting is of this form. The assumption was that the far end supports it
1453 properly... but experience shows that there are some that give 5xx responses,
1454 even though the banner includes "ESMTP" (there's a bloody-minded one that
1455 says "ESMTP not spoken here"). Cope with that case.
1456
1457 September 2000: Time has passed, and it seems reasonable now to always send
1458 EHLO at the start. It is also convenient to make the change while installing
1459 the TLS stuff.
1460
1461 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1462 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1463 would be no way to send out the mails, so there is now a host list
1464 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1465 PIPELINING problem as well. Maybe it can also be useful to cure other
1466 problems with broken servers.
1467
1468 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1469 Then somebody tried it with a Microsoft mailer... It seems that all other
1470 mailers use upper case for some reason (the RFC is quite clear about case
1471 independence) so, for peace of mind, I gave in. */
1472
5130845b 1473 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1474
061b7ebd
PP
1475 /* Alas; be careful, since this goto is not an error-out, so conceivably
1476 we might set data between here and the target which we assume to exist
1477 and be usable. I can see this coming back to bite us. */
a7538db1 1478#ifdef SUPPORT_TLS
061b7ebd
PP
1479 if (smtps)
1480 {
1481 tls_offered = TRUE;
1482 suppress_tls = FALSE;
1483 ob->tls_tempfail_tryclear = FALSE;
1484 smtp_command = US"SSL-on-connect";
1485 goto TLS_NEGOTIATE;
1486 }
a7538db1 1487#endif
061b7ebd 1488
0756eb3c
PH
1489 if (esmtp)
1490 {
1491 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1492 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1493 goto SEND_FAILED;
1494 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1495 ob->command_timeout))
1496 {
1497 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1498 esmtp = FALSE;
1499 }
1500 }
1501 else
1502 {
1503 DEBUG(D_transport)
1504 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1505 }
1506
1507 if (!esmtp)
1508 {
1509 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1510 goto SEND_FAILED;
1511 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1512 ob->command_timeout)) goto RESPONSE_FAILED;
1513 }
1514
f1513293
PH
1515 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1516 lmtp_ignore_quota option was set. */
1517
1518 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1519 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1520 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1521
0756eb3c
PH
1522 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1523
a7538db1 1524#ifdef SUPPORT_TLS
0756eb3c
PH
1525 tls_offered = esmtp &&
1526 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1527 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1528#endif
fd98a5c6 1529
a7538db1 1530#ifndef DISABLE_PRDR
5130845b
JH
1531 prdr_offered = esmtp
1532 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1533 PCRE_EOPT, NULL, 0) >= 0
1534 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1535
1536 if (prdr_offered)
1537 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1538#endif
0756eb3c
PH
1539 }
1540
1541/* For continuing deliveries down the same channel, the socket is the standard
1542input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1543below). Set up the pointer to where subsequent commands will be left, for
1544error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1545set from the command line if they were set in the process that passed the
1546connection on. */
1547
1548else
1549 {
1550 inblock.sock = outblock.sock = fileno(stdin);
1551 smtp_command = big_buffer;
4311097e 1552 host->port = port; /* Record the port that was used */
0756eb3c
PH
1553 }
1554
1555/* If TLS is available on this connection, whether continued or not, attempt to
1556start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1557send another EHLO - the server may give a different answer in secure mode. We
1558use a separate buffer for reading the response to STARTTLS so that if it is
1559negative, the original EHLO data is available for subsequent analysis, should
1560the client not be required to use TLS. If the response is bad, copy the buffer
1561for error analysis. */
1562
1563#ifdef SUPPORT_TLS
5130845b
JH
1564if ( tls_offered
1565 && !suppress_tls
1566 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1567 {
1568 uschar buffer2[4096];
1569 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1570 goto SEND_FAILED;
1571
1572 /* If there is an I/O error, transmission of this message is deferred. If
1573 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1574 false, we also defer. However, if there is a temporary rejection of STARTTLS
1575 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1576 STARTTLS, we carry on. This means we will try to send the message in clear,
1577 unless the host is in hosts_require_tls (tested below). */
1578
1579 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1580 ob->command_timeout))
1581 {
0756eb3c
PH
1582 if (errno != 0 || buffer2[0] == 0 ||
1583 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1584 {
1585 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1586 goto RESPONSE_FAILED;
0dda4340 1587 }
0756eb3c
PH
1588 }
1589
1590 /* STARTTLS accepted: try to negotiate a TLS session. */
1591
1592 else
061b7ebd 1593 TLS_NEGOTIATE:
0756eb3c 1594 {
0e66b3b6
JH
1595 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1596# ifdef EXPERIMENTAL_DANE
1597 , dane ? &tlsa_dnsa : NULL
1598# endif
1599 );
0756eb3c
PH
1600
1601 /* TLS negotiation failed; give an error. From outside, this function may
1602 be called again to try in clear on a new connection, if the options permit
1603 it for this host. */
1604
1605 if (rc != OK)
1606 {
6ebd79ec
JH
1607# ifdef EXPERIMENTAL_DANE
1608 if (rc == DEFER && dane && !dane_required)
1609 {
1610 log_write(0, LOG_MAIN, "DANE attempt failed;"
1611 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1612 host->name, host->address);
1613 dane = FALSE;
1614 goto TLS_NEGOTIATE;
1615 }
1616# endif
1617
0756eb3c
PH
1618 save_errno = ERRNO_TLSFAILURE;
1619 message = US"failure while setting up TLS session";
1620 send_quit = FALSE;
1621 goto TLS_FAILED;
1622 }
1623
1624 /* TLS session is set up */
1625
1626 for (addr = addrlist; addr != NULL; addr = addr->next)
5ca2a9a1
PH
1627 if (addr->transport_return == PENDING_DEFER)
1628 {
817d9f57 1629 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1630 addr->ourcert = tls_out.ourcert;
1631 addr->peercert = tls_out.peercert;
817d9f57 1632 addr->peerdn = tls_out.peerdn;
018058b2 1633 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1634 }
0756eb3c
PH
1635 }
1636 }
1637
061b7ebd
PP
1638/* if smtps, we'll have smtp_command set to something else; always safe to
1639reset it here. */
1640smtp_command = big_buffer;
1641
41c7c167
PH
1642/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1643helo_data is null, we are dealing with a connection that was passed from
1644another process, and so we won't have expanded helo_data above. We have to
1645expand it here. $sending_ip_address and $sending_port are set up right at the
1646start of the Exim process (in exim.c). */
0756eb3c 1647
817d9f57 1648if (tls_out.active >= 0)
0756eb3c 1649 {
061b7ebd 1650 char *greeting_cmd;
41c7c167
PH
1651 if (helo_data == NULL)
1652 {
1653 helo_data = expand_string(ob->helo_data);
1654 if (helo_data == NULL)
1655 {
1656 uschar *message = string_sprintf("failed to expand helo_data: %s",
1657 expand_string_message);
168dec3b 1658 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
41c7c167
PH
1659 yield = DEFER;
1660 goto SEND_QUIT;
1661 }
1662 }
1663
0d0e4455 1664 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1665 if (smtps)
1666 {
1667 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1668 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1669 }
1670
1671 if (esmtp)
1672 greeting_cmd = "EHLO";
1673 else
1674 {
1675 greeting_cmd = "HELO";
1676 DEBUG(D_transport)
1677 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1678 }
1679
1680 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1681 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1682 goto SEND_FAILED;
1683 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1684 ob->command_timeout))
1685 goto RESPONSE_FAILED;
1686 }
1687
1688/* If the host is required to use a secure channel, ensure that we
1689have one. */
1690
0e66b3b6
JH
1691else if (
1692# ifdef EXPERIMENTAL_DANE
1693 dane ||
1694# endif
5130845b 1695 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1696 )
0756eb3c
PH
1697 {
1698 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1699 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH
1700 tls_offered? "an attempt to start TLS failed" :
1701 "the server did not offer TLS support");
1702 goto TLS_FAILED;
1703 }
0e66b3b6 1704#endif /*SUPPORT_TLS*/
0756eb3c
PH
1705
1706/* If TLS is active, we have just started it up and re-done the EHLO command,
1707so its response needs to be analyzed. If TLS is not active and this is a
1708continued session down a previously-used socket, we haven't just done EHLO, so
1709we skip this. */
1710
1711if (continue_hostname == NULL
a7538db1 1712#ifdef SUPPORT_TLS
817d9f57 1713 || tls_out.active >= 0
a7538db1 1714#endif
0756eb3c
PH
1715 )
1716 {
f1513293
PH
1717 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1718 lmtp_ignore_quota option was set. */
1719
1720 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1721 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1722 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1723
0756eb3c
PH
1724 /* If the response to EHLO specified support for the SIZE parameter, note
1725 this, provided size_addition is non-negative. */
1726
1727 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1728 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1729 PCRE_EOPT, NULL, 0) >= 0;
1730
1731 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1732 the current host, esmtp will be false, so PIPELINING can never be used. If
1733 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1734
5130845b
JH
1735 smtp_use_pipelining = esmtp
1736 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1737 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1738 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH
1739
1740 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1741 smtp_use_pipelining? "" : "not ");
1742
8ccd00b1 1743#ifndef DISABLE_PRDR
5130845b
JH
1744 prdr_offered = esmtp
1745 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1746 PCRE_EOPT, NULL, 0) >= 0
1747 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1748
1749 if (prdr_offered)
1750 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1751#endif
1752
6c1c3d1d
WB
1753 /* Note if the server supports DSN */
1754 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1755 PCRE_EOPT, NULL, 0) >= 0;
1756 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1757
0756eb3c
PH
1758 /* Note if the response to EHLO specifies support for the AUTH extension.
1759 If it has, check that this host is one we want to authenticate to, and do
1760 the business. The host name and address must be available when the
1761 authenticator's client driver is running. */
1762
fcc8e047
JH
1763 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1764 ob, esmtp, &inblock, &outblock))
0756eb3c 1765 {
fcc8e047
JH
1766 default: goto SEND_QUIT;
1767 case OK: break;
1768 case FAIL_SEND: goto SEND_FAILED;
1769 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1770 }
1771 }
1772
1773/* The setting up of the SMTP call is now complete. Any subsequent errors are
1774message-specific. */
1775
1776setting_up = FALSE;
1777
1778/* If there is a filter command specified for this transport, we can now
1779set it up. This cannot be done until the identify of the host is known. */
1780
1781if (tblock->filter_command != NULL)
1782 {
1783 BOOL rc;
1784 uschar buffer[64];
1785 sprintf(CS buffer, "%.50s transport", tblock->name);
1786 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1787 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1788 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1789
1790 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1791 yield ERROR. */
1792
1793 if (!rc)
1794 {
447d236c 1795 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
c562fd30 1796 FALSE, NULL);
0756eb3c
PH
1797 yield = ERROR;
1798 goto SEND_QUIT;
1799 }
1800 }
1801
1802
1803/* For messages that have more than the maximum number of envelope recipients,
1804we want to send several transactions down the same SMTP connection. (See
1805comments in deliver.c as to how this reconciles, heuristically, with
1806remote_max_parallel.) This optimization was added to Exim after the following
1807code was already working. The simplest way to put it in without disturbing the
1808code was to use a goto to jump back to this point when there is another
1809transaction to handle. */
1810
1811SEND_MESSAGE:
1812sync_addr = first_addr;
1813address_count = 0;
1814ok = FALSE;
1815send_rset = TRUE;
1816completed_address = FALSE;
1817
1818
1819/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1820qualification, send it, adding something to the message size to allow for
1821imprecision and things that get added en route. Exim keeps the number of lines
1822in a message, so we can give an accurate value for the original message, but we
1823need some additional to handle added headers. (Double "." characters don't get
1824included in the count.) */
1825
1826p = buffer;
1827*p = 0;
1828
1829if (smtp_use_size)
1830 {
1831 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1832 while (*p) p++;
1833 }
1834
8ccd00b1 1835#ifndef DISABLE_PRDR
fd98a5c6
JH
1836prdr_active = FALSE;
1837if (prdr_offered)
1838 {
1839 for (addr = first_addr; addr; addr = addr->next)
1840 if (addr->transport_return == PENDING_DEFER)
1841 {
1842 for (addr = addr->next; addr; addr = addr->next)
1843 if (addr->transport_return == PENDING_DEFER)
1844 { /* at least two recipients to send */
1845 prdr_active = TRUE;
1846 sprintf(CS p, " PRDR"); p += 5;
a7538db1 1847 break;
fd98a5c6
JH
1848 }
1849 break;
1850 }
1851 }
fd98a5c6
JH
1852#endif
1853
6c1c3d1d
WB
1854/* check if all addresses have lasthop flag */
1855/* do not send RET and ENVID if true */
1856dsn_all_lasthop = TRUE;
1857for (addr = first_addr;
1858 address_count < max_rcpt && addr != NULL;
1859 addr = addr->next)
1860 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1861 dsn_all_lasthop = FALSE;
1862
1863/* Add any DSN flags to the mail command */
1864
1865if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1866 {
1867 if (dsn_ret == dsn_ret_hdrs)
1868 {
45500060 1869 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB
1870 while (*p) p++;
1871 }
1872 else if (dsn_ret == dsn_ret_full)
1873 {
45500060 1874 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB
1875 while (*p) p++;
1876 }
1877 if (dsn_envid != NULL)
1878 {
1879 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1880 while (*p) p++;
1881 }
1882 }
6c1c3d1d 1883
6b62e899
JH
1884/* If an authenticated_sender override has been specified for this transport
1885instance, expand it. If the expansion is forced to fail, and there was already
1886an authenticated_sender for this message, the original value will be used.
1887Other expansion failures are serious. An empty result is ignored, but there is
1888otherwise no check - this feature is expected to be used with LMTP and other
1889cases where non-standard addresses (e.g. without domains) might be required. */
1890
fcc8e047 1891if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
1892 {
1893 yield = ERROR;
1894 goto SEND_QUIT;
1895 }
0756eb3c
PH
1896
1897/* From here until we send the DATA command, we can make use of PIPELINING
1898if the server host supports it. The code has to be able to check the responses
1899at any point, for when the buffer fills up, so we write it totally generally.
1900When PIPELINING is off, each command written reports that it has flushed the
1901buffer. */
1902
1903pending_MAIL = TRUE; /* The block starts with MAIL */
1904
1905rc = smtp_write_command(&outblock, smtp_use_pipelining,
1906 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1907mail_command = string_copy(big_buffer); /* Save for later error message */
1908
1909switch(rc)
1910 {
1911 case -1: /* Transmission error */
1912 goto SEND_FAILED;
1913
1914 case +1: /* Block was sent */
1915 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc
PH
1916 ob->command_timeout))
1917 {
1918 if (errno == 0 && buffer[0] == '4')
1919 {
1920 errno = ERRNO_MAIL4XX;
1921 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1922 }
1923 goto RESPONSE_FAILED;
1924 }
0756eb3c
PH
1925 pending_MAIL = FALSE;
1926 break;
1927 }
1928
1929/* Pass over all the relevant recipient addresses for this host, which are the
1930ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1931several before we have to read the responses for those seen so far. This
1932checking is done by a subroutine because it also needs to be done at the end.
1933Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1934the next one if not all are sent.
1935
1936In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1937last address because we want to abort if any recipients have any kind of
1938problem, temporary or permanent. We know that all recipient addresses will have
1939the PENDING_DEFER status, because only one attempt is ever made, and we know
1940that max_rcpt will be large, so all addresses will be done at once. */
1941
1942for (addr = first_addr;
1943 address_count < max_rcpt && addr != NULL;
1944 addr = addr->next)
1945 {
1946 int count;
1947 BOOL no_flush;
1948
a7538db1 1949 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 1950
0756eb3c
PH
1951 if (addr->transport_return != PENDING_DEFER) continue;
1952
1953 address_count++;
1954 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1955
6c1c3d1d
WB
1956 /* Add any DSN flags to the rcpt command and add to the sent string */
1957
1958 p = buffer;
1959 *p = 0;
1960
a7538db1 1961 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
1962 {
1963 if ((addr->dsn_flags & rf_dsnflags) != 0)
1964 {
1965 int i;
1966 BOOL first = TRUE;
45500060 1967 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
1968 while (*p) p++;
1969 for (i = 0; i < 4; i++)
6c1c3d1d
WB
1970 if ((addr->dsn_flags & rf_list[i]) != 0)
1971 {
1972 if (!first) *p++ = ',';
1973 first = FALSE;
45500060 1974 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
1975 while (*p) p++;
1976 }
6c1c3d1d
WB
1977 }
1978
a7538db1
JH
1979 if (addr->dsn_orcpt != NULL)
1980 {
6c1c3d1d
WB
1981 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1982 addr->dsn_orcpt);
1983 while (*p) p++;
1984 }
1985 }
6c1c3d1d 1986
0756eb3c
PH
1987 /* Now send the RCPT command, and process outstanding responses when
1988 necessary. After a timeout on RCPT, we just end the function, leaving the
1989 yield as OK, because this error can often mean that there is a problem with
1990 just one address, so we don't want to delay the host. */
1991
6c1c3d1d
WB
1992 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1993 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
6c1c3d1d 1994
0756eb3c
PH
1995 if (count < 0) goto SEND_FAILED;
1996 if (count > 0)
1997 {
1998 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
1999 &sync_addr, host, count, ob->address_retry_include_sender,
2000 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2001 sizeof(buffer)))
0756eb3c
PH
2002 {
2003 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2004 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2005 break;
2006
2007 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2008 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2009 case 0: /* No 2xx or 5xx, but no probs */
2010 break;
2011
2012 case -1: goto END_OFF; /* Timeout on RCPT */
2013 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2014 }
2015 pending_MAIL = FALSE; /* Dealt with MAIL */
2016 }
2017 } /* Loop for next address */
2018
2019/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2020permanently or temporarily. We should have flushed and synced after the last
2021RCPT. */
2022
2023if (mua_wrapper)
2024 {
2025 address_item *badaddr;
168dec3b
JH
2026 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2027 if (badaddr->transport_return != PENDING_OK)
2028 {
2029 /*XXX could we find a better errno than 0 here? */
2030 set_errno(addrlist, 0, badaddr->message, FAIL,
2031 testflag(badaddr, af_pass_message), NULL);
2032 ok = FALSE;
2033 break;
2034 }
0756eb3c
PH
2035 }
2036
2037/* If ok is TRUE, we know we have got at least one good recipient, and must now
2038send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2039have a good recipient buffered up if we are pipelining. We don't want to waste
2040time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2041are pipelining. The responses are all handled by sync_responses(). */
2042
2043if (ok || (smtp_use_pipelining && !mua_wrapper))
2044 {
2045 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2046 if (count < 0) goto SEND_FAILED;
2047 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2048 host, count, ob->address_retry_include_sender, pending_MAIL,
2049 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2050 {
2051 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2052 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2053 break;
2054
2055 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2056 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2057 case 0: break; /* No 2xx or 5xx, but no probs */
2058
2059 case -1: goto END_OFF; /* Timeout on RCPT */
2060 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2061 }
2062 }
2063
2064/* Save the first address of the next batch. */
2065
2066first_addr = addr;
2067
2068/* If there were no good recipients (but otherwise there have been no
2069problems), just set ok TRUE, since we have handled address-specific errors
2070already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2071for handling the SMTP dot-handling protocol, flagging to apply to headers as
2072well as body. Set the appropriate timeout value to be used for each chunk.
2073(Haven't been able to make it work using select() for writing yet.) */
2074
2075if (!ok) ok = TRUE; else
2076 {
2077 sigalrm_seen = FALSE;
2078 transport_write_timeout = ob->data_timeout;
2079 smtp_command = US"sending data block"; /* For error messages */
2080 DEBUG(D_transport|D_v)
2081 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2082 transport_count = 0;
a7538db1 2083
80a47a2c 2084#ifndef DISABLE_DKIM
4cd12fe9
TK
2085 ok = dkim_transport_write_message(addrlist, inblock.sock,
2086 topt_use_crlf | topt_end_dot | topt_escape_headers |
2087 (tblock->body_only? topt_no_headers : 0) |
2088 (tblock->headers_only? topt_no_body : 0) |
2089 (tblock->return_path_add? topt_add_return_path : 0) |
2090 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2091 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2092 0, /* No size limit */
2093 tblock->add_headers, tblock->remove_headers,
2094 US".", US"..", /* Escaping strings */
2095 tblock->rewrite_rules, tblock->rewrite_existflags,
2096 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2097 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2098 );
2099#else
0756eb3c
PH
2100 ok = transport_write_message(addrlist, inblock.sock,
2101 topt_use_crlf | topt_end_dot | topt_escape_headers |
2102 (tblock->body_only? topt_no_headers : 0) |
2103 (tblock->headers_only? topt_no_body : 0) |
2104 (tblock->return_path_add? topt_add_return_path : 0) |
2105 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2106 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2107 0, /* No size limit */
2108 tblock->add_headers, tblock->remove_headers,
2109 US".", US"..", /* Escaping strings */
2110 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2111#endif
0756eb3c
PH
2112
2113 /* transport_write_message() uses write() because it is called from other
2114 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2115 it can exit with "Broken pipe" as its error. This really means that the
2116 socket got closed at the far end. */
2117
2118 transport_write_timeout = 0; /* for subsequent transports */
2119
2120 /* Failure can either be some kind of I/O disaster (including timeout),
2121 or the failure of a transport filter or the expansion of added headers. */
2122
2123 if (!ok)
2124 {
2125 buffer[0] = 0; /* There hasn't been a response */
2126 goto RESPONSE_FAILED;
2127 }
2128
2129 /* We used to send the terminating "." explicitly here, but because of
2130 buffering effects at both ends of TCP/IP connections, you don't gain
2131 anything by keeping it separate, so it might as well go in the final
2132 data buffer for efficiency. This is now done by setting the topt_end_dot
2133 flag above. */
2134
2135 smtp_command = US"end of data";
2136
8ccd00b1 2137#ifndef DISABLE_PRDR
fd98a5c6
JH
2138 /* For PRDR we optionally get a partial-responses warning
2139 * followed by the individual responses, before going on with
2140 * the overall response. If we don't get the warning then deal
2141 * with per non-PRDR. */
2142 if(prdr_active)
2143 {
2144 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2145 ob->final_timeout);
2146 if (!ok && errno == 0)
2147 switch(buffer[0])
2148 {
2149 case '2': prdr_active = FALSE;
2150 ok = TRUE;
2151 break;
2152 case '4': errno = ERRNO_DATA4XX;
2153 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2154 break;
2155 }
2156 }
2157 else
2158#endif
2159
2160 /* For non-PRDR SMTP, we now read a single response that applies to the
2161 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2162
e97957bc
PH
2163 if (!lmtp)
2164 {
2165 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2166 ob->final_timeout);
2167 if (!ok && errno == 0 && buffer[0] == '4')
2168 {
2169 errno = ERRNO_DATA4XX;
2170 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2171 }
2172 }
0756eb3c
PH
2173
2174 /* For LMTP, we get back a response for every RCPT command that we sent;
2175 some may be accepted and some rejected. For those that get a response, their
2176 status is fixed; any that are accepted have been handed over, even if later
2177 responses crash - at least, that's how I read RFC 2033.
2178
2179 If all went well, mark the recipient addresses as completed, record which
2180 host/IPaddress they were delivered to, and cut out RSET when sending another
2181 message down the same channel. Write the completed addresses to the journal
2182 now so that they are recorded in case there is a crash of hardware or
2183 software before the spool gets updated. Also record the final SMTP
2184 confirmation if needed (for SMTP only). */
2185
2186 if (ok)
2187 {
2188 int flag = '=';
2189 int delivery_time = (int)(time(NULL) - start_delivery_time);
2190 int len;
0756eb3c
PH
2191 uschar *conf = NULL;
2192 send_rset = FALSE;
2193
0756eb3c
PH
2194 /* Set up confirmation if needed - applies only to SMTP */
2195
d68218c7 2196 if (
774ef2d7 2197#ifndef EXPERIMENTAL_EVENT
d68218c7 2198 (log_extra_selector & LX_smtp_confirmation) != 0 &&
a7538db1 2199#endif
d68218c7
JH
2200 !lmtp
2201 )
0756eb3c
PH
2202 {
2203 uschar *s = string_printing(buffer);
2204 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2205 }
2206
fd98a5c6 2207 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2208 each one. */
2209
2210 for (addr = addrlist; addr != first_addr; addr = addr->next)
2211 {
2212 if (addr->transport_return != PENDING_OK) continue;
2213
2214 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2215 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2216 address. For temporary errors, add a retry item for the address so that
2217 it doesn't get tried again too soon. */
0756eb3c 2218
8ccd00b1 2219#ifndef DISABLE_PRDR
fd98a5c6
JH
2220 if (lmtp || prdr_active)
2221#else
0756eb3c 2222 if (lmtp)
fd98a5c6 2223#endif
0756eb3c
PH
2224 {
2225 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2226 ob->final_timeout))
2227 {
2228 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2229 addr->message = string_sprintf(
8ccd00b1 2230#ifndef DISABLE_PRDR
fd98a5c6
JH
2231 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2232#else
2233 "LMTP error after %s: %s",
2234#endif
0756eb3c 2235 big_buffer, string_printing(buffer));
75def545
PH
2236 setflag(addr, af_pass_message); /* Allow message to go to user */
2237 if (buffer[0] == '5')
2238 addr->transport_return = FAIL;
2239 else
2240 {
e97957bc
PH
2241 errno = ERRNO_DATA4XX;
2242 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2243 addr->transport_return = DEFER;
8ccd00b1 2244#ifndef DISABLE_PRDR
fd98a5c6
JH
2245 if (!prdr_active)
2246#endif
2247 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2248 }
0756eb3c
PH
2249 continue;
2250 }
2251 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
2252 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2253 {
2254 uschar *s = string_printing(buffer);
2255 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2256 }
0756eb3c
PH
2257 }
2258
2259 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2260 actual host that was used. */
0756eb3c
PH
2261
2262 addr->transport_return = OK;
2263 addr->more_errno = delivery_time;
d427a7f9 2264 addr->host_used = host;
0756eb3c
PH
2265 addr->special_action = flag;
2266 addr->message = conf;
8ccd00b1 2267#ifndef DISABLE_PRDR
fd98a5c6
JH
2268 if (prdr_active) addr->flags |= af_prdr_used;
2269#endif
0756eb3c
PH
2270 flag = '-';
2271
8ccd00b1 2272#ifndef DISABLE_PRDR
fd98a5c6
JH
2273 if (!prdr_active)
2274#endif
2275 {
2276 /* Update the journal. For homonymic addresses, use the base address plus
2277 the transport name. See lots of comments in deliver.c about the reasons
2278 for the complications when homonyms are involved. Just carry on after
2279 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2280
fd98a5c6
JH
2281 if (testflag(addr, af_homonym))
2282 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2283 else
2284 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2285
fd98a5c6
JH
2286 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2287 len = Ustrlen(CS buffer);
2288 if (write(journal_fd, buffer, len) != len)
2289 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2290 "%s: %s", buffer, strerror(errno));
2291 }
0756eb3c
PH
2292 }
2293
8ccd00b1 2294#ifndef DISABLE_PRDR
fd98a5c6
JH
2295 if (prdr_active)
2296 {
2297 /* PRDR - get the final, overall response. For any non-success
2298 upgrade all the address statuses. */
2299 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2300 ob->final_timeout);
2301 if (!ok)
2302 {
2303 if(errno == 0 && buffer[0] == '4')
2304 {
2305 errno = ERRNO_DATA4XX;
2306 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2307 }
2308 for (addr = addrlist; addr != first_addr; addr = addr->next)
2309 if (buffer[0] == '5' || addr->transport_return == OK)
2310 addr->transport_return = PENDING_OK; /* allow set_errno action */
2311 goto RESPONSE_FAILED;
2312 }
2313
2314 /* Update the journal, or setup retry. */
2315 for (addr = addrlist; addr != first_addr; addr = addr->next)
2316 if (addr->transport_return == OK)
2317 {
2318 if (testflag(addr, af_homonym))
2319 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2320 else
2321 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2322
fd98a5c6
JH
2323 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2324 len = Ustrlen(CS buffer);
2325 if (write(journal_fd, buffer, len) != len)
2326 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2327 "%s: %s", buffer, strerror(errno));
2328 }
2329 else if (addr->transport_return == DEFER)
2330 retry_add_item(addr, addr->address_retry_key, -2);
2331 }
2332#endif
2333
0756eb3c
PH
2334 /* Ensure the journal file is pushed out to disk. */
2335
54fc8428 2336 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2337 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2338 strerror(errno));
2339 }
2340 }
2341
2342
2343/* Handle general (not specific to one address) failures here. The value of ok
2344is used to skip over this code on the falling through case. A timeout causes a
2345deferral. Other errors may defer or fail according to the response code, and
2346may set up a special errno value, e.g. after connection chopped, which is
2347assumed if errno == 0 and there is no text in the buffer. If control reaches
2348here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2349the problem is not related to this specific message. */
2350
2351if (!ok)
2352 {
2353 int code;
2354
2355 RESPONSE_FAILED:
2356 save_errno = errno;
2357 message = NULL;
2358 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2359 buffer, &code, &message, &pass_message);
0756eb3c
PH
2360 goto FAILED;
2361
2362 SEND_FAILED:
2363 save_errno = errno;
2364 code = '4';
2365 message = US string_sprintf("send() to %s [%s] failed: %s",
2366 host->name, host->address, strerror(save_errno));
2367 send_quit = FALSE;
2368 goto FAILED;
2369
2370 /* This label is jumped to directly when a TLS negotiation has failed,
2371 or was not done for a host for which it is required. Values will be set
2372 in message and save_errno, and setting_up will always be true. Treat as
2373 a temporary error. */
2374
a7538db1 2375#ifdef SUPPORT_TLS
0756eb3c
PH
2376 TLS_FAILED:
2377 code = '4';
a7538db1 2378#endif
0756eb3c
PH
2379
2380 /* If the failure happened while setting up the call, see if the failure was
2381 a 5xx response (this will either be on connection, or following HELO - a 5xx
2382 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2383 never going to accept them. For other errors during setting up (timeouts or
2384 whatever), defer all addresses, and yield DEFER, so that the host is not
2385 tried again for a while. */
2386
2387 FAILED:
2388 ok = FALSE; /* For when reached by GOTO */
2389
2390 if (setting_up)
2391 {
2392 if (code == '5')
c562fd30 2393 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
0756eb3c
PH
2394 else
2395 {
c562fd30 2396 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2397 yield = DEFER;
2398 }
2399 }
2400
e97957bc 2401 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2402 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2403 the contents of the message rather than a real error on the connection. These
2404 cases are treated in the same way as a 4xx response. This next bit of code
2405 does the classification. */
0756eb3c 2406
e97957bc 2407 else
0756eb3c 2408 {
e97957bc 2409 BOOL message_error;
0756eb3c 2410
e97957bc
PH
2411 switch(save_errno)
2412 {
2413 case 0:
2414 case ERRNO_MAIL4XX:
2415 case ERRNO_DATA4XX:
2416 message_error = TRUE;
2417 break;
0756eb3c 2418
e97957bc
PH
2419 case ETIMEDOUT:
2420 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2421 Ustrncmp(smtp_command,"end ",4) == 0;
2422 break;
2423
2424 case ERRNO_SMTPCLOSED:
2425 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2426 break;
2427
2428 default:
2429 message_error = FALSE;
2430 break;
2431 }
0756eb3c 2432
e97957bc 2433 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2434
e97957bc
PH
2435 (a) negative response or timeout after MAIL
2436 (b) negative response after DATA
2437 (c) negative response or timeout or dropped connection after "."
0756eb3c 2438
e97957bc
PH
2439 It won't be a negative response or timeout after RCPT, as that is dealt
2440 with separately above. The action in all cases is to set an appropriate
2441 error code for all the addresses, but to leave yield set to OK because the
2442 host itself has not failed. Of course, it might in practice have failed
2443 when we've had a timeout, but if so, we'll discover that at the next
2444 delivery attempt. For a temporary error, set the message_defer flag, and
2445 write to the logs for information if this is not the last host. The error
2446 for the last host will be logged as part of the address's log line. */
2447
2448 if (message_error)
0756eb3c 2449 {
e97957bc
PH
2450 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2451 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
c562fd30 2452 pass_message, host);
e97957bc
PH
2453
2454 /* If there's an errno, the message contains just the identity of
2455 the host. */
2456
2457 if (code != '5') /* Anything other than 5 is treated as temporary */
2458 {
2459 if (save_errno > 0)
2460 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2461 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2462 msglog_line(host, message);
e97957bc
PH
2463 *message_defer = TRUE;
2464 }
2465 }
2466
2467 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2468 ".", or some other transportation error. We defer all addresses and yield
2469 DEFER, except for the case of failed add_headers expansion, or a transport
2470 filter failure, when the yield should be ERROR, to stop it trying other
2471 hosts. */
2472
2473 else
2474 {
2475 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2476 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
c562fd30 2477 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2478 }
2479 }
2480 }
2481
2482
2483/* If all has gone well, send_quit will be set TRUE, implying we can end the
2484SMTP session tidily. However, if there were too many addresses to send in one
2485message (indicated by first_addr being non-NULL) we want to carry on with the
2486rest of them. Also, it is desirable to send more than one message down the SMTP
2487connection if there are several waiting, provided we haven't already sent so
2488many as to hit the configured limit. The function transport_check_waiting looks
2489for a waiting message and returns its id. Then transport_pass_socket tries to
2490set up a continued delivery by passing the socket on to another process. The
2491variable send_rset is FALSE if a message has just been successfully transfered.
2492
2493If we are already sending down a continued channel, there may be further
2494addresses not yet delivered that are aimed at the same host, but which have not
2495been passed in this run of the transport. In this case, continue_more will be
2496true, and all we should do is send RSET if necessary, and return, leaving the
2497channel open.
2498
2499However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2500do not want to continue with other messages down the same channel, because that
2501can lead to looping between two or more messages, all with the same,
2502temporarily failing address(es). [The retry information isn't updated yet, so
2503new processes keep on trying.] We probably also don't want to try more of this
2504message's addresses either.
2505
2506If we have started a TLS session, we have to end it before passing the
2507connection to a new process. However, not all servers can handle this (Exim
2508can), so we do not pass such a connection on if the host matches
2509hosts_nopass_tls. */
2510
2511DEBUG(D_transport)
2512 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2513 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2514 continue_more, yield, (first_addr == NULL)? "":"not ");
2515
2516if (completed_address && ok && send_quit)
2517 {
2518 BOOL more;
5130845b
JH
2519 if ( first_addr != NULL
2520 || continue_more
2521 || ( ( tls_out.active < 0
2522 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2523 )
0756eb3c
PH
2524 &&
2525 transport_check_waiting(tblock->name, host->name,
2526 tblock->connection_max_messages, new_message_id, &more)
5130845b 2527 ) )
0756eb3c
PH
2528 {
2529 uschar *msg;
447d236c 2530 BOOL pass_message;
0756eb3c
PH
2531
2532 if (send_rset)
2533 {
2534 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2535 {
2536 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2537 host->address, strerror(save_errno));
2538 send_quit = FALSE;
2539 }
2540 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2541 ob->command_timeout)))
2542 {
2543 int code;
447d236c
PH
2544 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2545 &pass_message);
0756eb3c
PH
2546 if (!send_quit)
2547 {
c562fd30
JH
2548 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2549 host->name, host->address, msg);
0756eb3c
PH
2550 }
2551 }
2552 }
2553
2554 /* Either RSET was not needed, or it succeeded */
2555
2556 if (ok)
2557 {
2558 if (first_addr != NULL) /* More addresses still to be sent */
2559 { /* in this run of the transport */
2560 continue_sequence++; /* Causes * in logging */
2561 goto SEND_MESSAGE;
2562 }
2563 if (continue_more) return yield; /* More addresses for another run */
2564
2565 /* Pass the socket to a new Exim process. Before doing so, we must shut
2566 down TLS. Not all MTAs allow for the continuation of the SMTP session
2567 when TLS is shut down. We test for this by sending a new EHLO. If we
2568 don't get a good response, we don't attempt to pass the socket on. */
2569
a7538db1 2570#ifdef SUPPORT_TLS
817d9f57 2571 if (tls_out.active >= 0)
0756eb3c 2572 {
817d9f57 2573 tls_close(FALSE, TRUE);
061b7ebd
PP
2574 if (smtps)
2575 ok = FALSE;
2576 else
2577 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2578 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2579 ob->command_timeout);
0756eb3c 2580 }
a7538db1 2581#endif
0756eb3c
PH
2582
2583 /* If the socket is successfully passed, we musn't send QUIT (or
2584 indeed anything!) from here. */
2585
2586 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2587 new_message_id, inblock.sock))
2588 {
2589 send_quit = FALSE;
2590 }
2591 }
2592
2593 /* If RSET failed and there are addresses left, they get deferred. */
2594
c562fd30 2595 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
0756eb3c
PH
2596 }
2597 }
2598
2599/* End off tidily with QUIT unless the connection has died or the socket has
2600been passed to another process. There has been discussion on the net about what
2601to do after sending QUIT. The wording of the RFC suggests that it is necessary
2602to wait for a response, but on the other hand, there isn't anything one can do
2603with an error response, other than log it. Exim used to do that. However,
2604further discussion suggested that it is positively advantageous not to wait for
2605the response, but to close the session immediately. This is supposed to move
2606the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2607load from the server. (Hosts that are both servers and clients may not see much
2608difference, of course.) Further discussion indicated that this was safe to do
2609on Unix systems which have decent implementations of TCP/IP that leave the
2610connection around for a while (TIME_WAIT) after the application has gone away.
2611This enables the response sent by the server to be properly ACKed rather than
2612timed out, as can happen on broken TCP/IP implementations on other OS.
2613
2614This change is being made on 31-Jul-98. After over a year of trouble-free
2615operation, the old commented-out code was removed on 17-Sep-99. */
2616
2617SEND_QUIT:
2618if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2619
2620END_OFF:
2621
2622#ifdef SUPPORT_TLS
817d9f57 2623tls_close(FALSE, TRUE);
0756eb3c
PH
2624#endif
2625
2626/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2627works because the NULL setting is passed back to the calling process, and
2628remote_max_parallel is forced to 1 when delivering over an existing connection,
2629
2630If all went well and continue_more is set, we shouldn't actually get here if
2631there are further addresses, as the return above will be taken. However,
2632writing RSET might have failed, or there may be other addresses whose hosts are
2633specified in the transports, and therefore not visible at top level, in which
2634case continue_more won't get set. */
2635
f1e894f3 2636(void)close(inblock.sock);
a7538db1 2637
774ef2d7
JH
2638#ifdef EXPERIMENTAL_EVENT
2639(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2640#endif
2641
0756eb3c
PH
2642continue_transport = NULL;
2643continue_hostname = NULL;
2644return yield;
2645}
2646
2647
2648
2649
2650/*************************************************
2651* Closedown entry point *
2652*************************************************/
2653
2654/* This function is called when exim is passed an open smtp channel
2655from another incarnation, but the message which it has been asked
2656to deliver no longer exists. The channel is on stdin.
2657
2658We might do fancy things like looking for another message to send down
2659the channel, but if the one we sought has gone, it has probably been
2660delivered by some other process that itself will seek further messages,
2661so just close down our connection.
2662
2663Argument: pointer to the transport instance block
2664Returns: nothing
2665*/
2666
2667void
2668smtp_transport_closedown(transport_instance *tblock)
2669{
2670smtp_transport_options_block *ob =
2671 (smtp_transport_options_block *)(tblock->options_block);
2672smtp_inblock inblock;
2673smtp_outblock outblock;
2674uschar buffer[256];
2675uschar inbuffer[4096];
2676uschar outbuffer[16];
2677
2678inblock.sock = fileno(stdin);
2679inblock.buffer = inbuffer;
2680inblock.buffersize = sizeof(inbuffer);
2681inblock.ptr = inbuffer;
2682inblock.ptrend = inbuffer;
2683
2684outblock.sock = inblock.sock;
2685outblock.buffersize = sizeof(outbuffer);
2686outblock.buffer = outbuffer;
2687outblock.ptr = outbuffer;
2688outblock.cmd_count = 0;
2689outblock.authenticating = FALSE;
2690
2691(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2692(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2693 ob->command_timeout);
f1e894f3 2694(void)close(inblock.sock);
0756eb3c
PH
2695}
2696
2697
2698
2699/*************************************************
2700* Prepare addresses for delivery *
2701*************************************************/
2702
2703/* This function is called to flush out error settings from previous delivery
2704attempts to other hosts. It also records whether we got here via an MX record
2705or not in the more_errno field of the address. We are interested only in
2706addresses that are still marked DEFER - others may have got delivered to a
2707previously considered IP address. Set their status to PENDING_DEFER to indicate
2708which ones are relevant this time.
2709
2710Arguments:
2711 addrlist the list of addresses
2712 host the host we are delivering to
2713
2714Returns: the first address for this delivery
2715*/
2716
2717static address_item *
2718prepare_addresses(address_item *addrlist, host_item *host)
2719{
2720address_item *first_addr = NULL;
2721address_item *addr;
2722for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
2723 if (addr->transport_return == DEFER)
2724 {
2725 if (first_addr == NULL) first_addr = addr;
2726 addr->transport_return = PENDING_DEFER;
2727 addr->basic_errno = 0;
2728 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2729 addr->message = NULL;
a7538db1 2730#ifdef SUPPORT_TLS
168dec3b
JH
2731 addr->cipher = NULL;
2732 addr->ourcert = NULL;
2733 addr->peercert = NULL;
2734 addr->peerdn = NULL;
2735 addr->ocsp = OCSP_NOT_REQ;
a7538db1 2736#endif
168dec3b 2737 }
0756eb3c
PH
2738return first_addr;
2739}
2740
2741
2742
2743/*************************************************
2744* Main entry point *
2745*************************************************/
2746
2747/* See local README for interface details. As this is a remote transport, it is
2748given a chain of addresses to be delivered in one connection, if possible. It
2749always returns TRUE, indicating that each address has its own independent
2750status set, except if there is a setting up problem, in which case it returns
2751FALSE. */
2752
2753BOOL
2754smtp_transport_entry(
2755 transport_instance *tblock, /* data for this instantiation */
2756 address_item *addrlist) /* addresses we are working on */
2757{
2758int cutoff_retry;
2759int port;
2760int hosts_defer = 0;
2761int hosts_fail = 0;
2762int hosts_looked_up = 0;
2763int hosts_retry = 0;
2764int hosts_serial = 0;
2765int hosts_total = 0;
8e669ac1 2766int total_hosts_tried = 0;
0756eb3c
PH
2767address_item *addr;
2768BOOL expired = TRUE;
2769BOOL continuing = continue_hostname != NULL;
2770uschar *expanded_hosts = NULL;
2771uschar *pistring;
2772uschar *tid = string_sprintf("%s transport", tblock->name);
2773smtp_transport_options_block *ob =
2774 (smtp_transport_options_block *)(tblock->options_block);
2775host_item *hostlist = addrlist->host_list;
2776host_item *host = NULL;
2777
2778DEBUG(D_transport)
2779 {
2780 debug_printf("%s transport entered\n", tblock->name);
2781 for (addr = addrlist; addr != NULL; addr = addr->next)
2782 debug_printf(" %s\n", addr->address);
2783 if (continuing) debug_printf("already connected to %s [%s]\n",
2784 continue_hostname, continue_host_address);
2785 }
2786
f6c332bd
PH
2787/* Set the flag requesting that these hosts be added to the waiting
2788database if the delivery fails temporarily or if we are running with
2789queue_smtp or a 2-stage queue run. This gets unset for certain
2790kinds of error, typically those that are specific to the message. */
2791
2792update_waiting = TRUE;
2793
0756eb3c
PH
2794/* If a host list is not defined for the addresses - they must all have the
2795same one in order to be passed to a single transport - or if the transport has
2796a host list with hosts_override set, use the host list supplied with the
2797transport. It is an error for this not to exist. */
2798
2799if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2800 {
2801 if (ob->hosts == NULL)
2802 {
2803 addrlist->message = string_sprintf("%s transport called with no hosts set",
2804 tblock->name);
2805 addrlist->transport_return = PANIC;
2806 return FALSE; /* Only top address has status */
2807 }
2808
2809 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2810 ob->hosts);
2811
2812 /* If the transport's host list contains no '$' characters, and we are not
2813 randomizing, it is fixed and therefore a chain of hosts can be built once
2814 and for all, and remembered for subsequent use by other calls to this
2815 transport. If, on the other hand, the host list does contain '$', or we are
2816 randomizing its order, we have to rebuild it each time. In the fixed case,
2817 as the hosts string will never be used again, it doesn't matter that we
2818 replace all the : characters with zeros. */
2819
2820 if (ob->hostlist == NULL)
2821 {
2822 uschar *s = ob->hosts;
2823
2824 if (Ustrchr(s, '$') != NULL)
2825 {
d427a7f9 2826 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
2827 {
2828 addrlist->message = string_sprintf("failed to expand list of hosts "
2829 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2830 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2831 return FALSE; /* Only top address has status */
2832 }
2833 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2834 "\"%s\"\n", s, expanded_hosts);
2835 s = expanded_hosts;
2836 }
2837 else
2838 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2839
2840 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2841
e276e04b
TF
2842 /* Check that the expansion yielded something useful. */
2843 if (hostlist == NULL)
2844 {
2845 addrlist->message =
2846 string_sprintf("%s transport has empty hosts setting", tblock->name);
2847 addrlist->transport_return = PANIC;
2848 return FALSE; /* Only top address has status */
2849 }
2850
0756eb3c
PH
2851 /* If there was no expansion of hosts, save the host list for
2852 next time. */
2853
d427a7f9 2854 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
2855 }
2856
2857 /* This is not the first time this transport has been run in this delivery;
2858 the host list was built previously. */
2859
2860 else hostlist = ob->hostlist;
2861 }
2862
2863/* The host list was supplied with the address. If hosts_randomize is set, we
2864must sort it into a random order if it did not come from MX records and has not
2865already been randomized (but don't bother if continuing down an existing
2866connection). */
2867
2868else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2869 {
2870 host_item *newlist = NULL;
2871 while (hostlist != NULL)
2872 {
2873 host_item *h = hostlist;
2874 hostlist = hostlist->next;
2875
2876 h->sort_key = random_number(100);
2877
2878 if (newlist == NULL)
2879 {
2880 h->next = NULL;
2881 newlist = h;
2882 }
2883 else if (h->sort_key < newlist->sort_key)
2884 {
2885 h->next = newlist;
2886 newlist = h;
2887 }
2888 else
2889 {
2890 host_item *hh = newlist;
2891 while (hh->next != NULL)
2892 {
2893 if (h->sort_key < hh->next->sort_key) break;
2894 hh = hh->next;
2895 }
2896 h->next = hh->next;
2897 hh->next = h;
2898 }
2899 }
2900
2901 hostlist = addrlist->host_list = newlist;
2902 }
2903
2904
2d280592 2905/* Sort out the default port. */
0756eb3c
PH
2906
2907if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c
PH
2908
2909
2910/* For each host-plus-IP-address on the list:
2911
2912. If this is a continued delivery and the host isn't the one with the
2913 current connection, skip.
2914
2915. If the status is unusable (i.e. previously failed or retry checked), skip.
2916
2917. If no IP address set, get the address, either by turning the name into
2918 an address, calling gethostbyname if gethostbyname is on, or by calling
2919 the DNS. The DNS may yield multiple addresses, in which case insert the
2920 extra ones into the list.
2921
2922. Get the retry data if not previously obtained for this address and set the
2923 field which remembers the state of this address. Skip if the retry time is
2924 not reached. If not, remember whether retry data was found. The retry string
2925 contains both the name and the IP address.
2926
2927. Scan the list of addresses and mark those whose status is DEFER as
2928 PENDING_DEFER. These are the only ones that will be processed in this cycle
2929 of the hosts loop.
2930
2931. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2932 Some addresses may be successfully delivered, others may fail, and yet
2933 others may get temporary errors and so get marked DEFER.
2934
2935. The return from the delivery attempt is OK if a connection was made and a
2936 valid SMTP dialogue was completed. Otherwise it is DEFER.
2937
2938. If OK, add a "remove" retry item for this host/IPaddress, if any.
2939
2940. If fail to connect, or other defer state, add a retry item.
2941
2942. If there are any addresses whose status is still DEFER, carry on to the
2943 next host/IPaddress, unless we have tried the number of hosts given
533244af 2944 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
2945 there is some fancy logic for hosts_max_try that means its limit can be
2946 overstepped in some circumstances.
0756eb3c
PH
2947
2948If we get to the end of the list, all hosts have deferred at least one address,
2949or not reached their retry times. If delay_after_cutoff is unset, it requests a
2950delivery attempt to those hosts whose last try was before the arrival time of
2951the current message. To cope with this, we have to go round the loop a second
2952time. After that, set the status and error data for any addresses that haven't
2953had it set already. */
2954
2955for (cutoff_retry = 0; expired &&
2956 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2957 cutoff_retry++)
2958 {
2959 host_item *nexthost = NULL;
2960 int unexpired_hosts_tried = 0;
2961
2962 for (host = hostlist;
8e669ac1 2963 host != NULL &&
533244af
PH
2964 unexpired_hosts_tried < ob->hosts_max_try &&
2965 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
2966 host = nexthost)
2967 {
2968 int rc;
2969 int host_af;
2970 uschar *rs;
2971 BOOL serialized = FALSE;
2972 BOOL host_is_expired = FALSE;
2973 BOOL message_defer = FALSE;
2974 BOOL ifchanges = FALSE;
2975 BOOL some_deferred = FALSE;
2976 address_item *first_addr = NULL;
2977 uschar *interface = NULL;
2978 uschar *retry_host_key = NULL;
2979 uschar *retry_message_key = NULL;
2980 uschar *serialize_key = NULL;
2981
9c4e8f60
PH
2982 /* Default next host is next host. :-) But this can vary if the
2983 hosts_max_try limit is hit (see below). It may also be reset if a host
2984 address is looked up here (in case the host was multihomed). */
2985
2986 nexthost = host->next;
2987
0756eb3c
PH
2988 /* If the address hasn't yet been obtained from the host name, look it up
2989 now, unless the host is already marked as unusable. If it is marked as
2990 unusable, it means that the router was unable to find its IP address (in
2991 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2992 the lookup failed last time. We don't get this far if *all* MX records
2993 point to non-existent hosts; that is treated as a hard error.
2994
2995 We can just skip this host entirely. When the hosts came from the router,
2996 the address will timeout based on the other host(s); when the address is
2997 looked up below, there is an explicit retry record added.
2998
2999 Note that we mustn't skip unusable hosts if the address is not unset; they
3000 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3001
3002 if (host->address == NULL)
3003 {
322050c2 3004 int new_port, flags;
7cd1141b 3005 host_item *hh;
0756eb3c
PH
3006 uschar *canonical_name;
3007
3008 if (host->status >= hstatus_unusable)
3009 {
3010 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3011 host->name);
3012 continue;
3013 }
3014
3015 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3016
7cd1141b
PH
3017 /* The host name is permitted to have an attached port. Find it, and
3018 strip it from the name. Just remember it for now. */
3019
3020 new_port = host_item_get_port(host);
3021
3022 /* Count hosts looked up */
3023
0756eb3c
PH
3024 hosts_looked_up++;
3025
3026 /* Find by name if so configured, or if it's an IP address. We don't
3027 just copy the IP address, because we need the test-for-local to happen. */
3028
322050c2
PH
3029 flags = HOST_FIND_BY_A;
3030 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3031 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3032
7e66e54d 3033 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
322050c2 3034 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
0756eb3c 3035 else
0756eb3c 3036 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
578897ea 3037 ob->dnssec_request_domains, ob->dnssec_require_domains,
0756eb3c 3038 &canonical_name, NULL);
0756eb3c 3039
7cd1141b
PH
3040 /* Update the host (and any additional blocks, resulting from
3041 multihoming) with a host-specific port, if any. */
3042
3043 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3044
0756eb3c
PH
3045 /* Failure to find the host at this time (usually DNS temporary failure)
3046 is really a kind of routing failure rather than a transport failure.
3047 Therefore we add a retry item of the routing kind, not to stop us trying
3048 to look this name up here again, but to ensure the address gets timed
3049 out if the failures go on long enough. A complete failure at this point
3050 commonly points to a configuration error, but the best action is still
3051 to carry on for the next host. */
3052
3053 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3054 {
3055 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3056 expired = FALSE;
3057 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3058 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3059 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3060 host->status = hstatus_unusable;
3061
3062 for (addr = addrlist; addr != NULL; addr = addr->next)
3063 {
3064 if (addr->transport_return != DEFER) continue;
3065 addr->basic_errno = ERRNO_UNKNOWNHOST;
3066 addr->message =
3067 string_sprintf("failed to lookup IP address for %s", host->name);
3068 }
3069 continue;
3070 }
3071
3072 /* If the host is actually the local host, we may have a problem, or
3073 there may be some cunning configuration going on. In the problem case,
3074 log things and give up. The default transport status is already DEFER. */
3075
3076 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3077 {
3078 for (addr = addrlist; addr != NULL; addr = addr->next)
3079 {
3080 addr->basic_errno = 0;
3081 addr->message = string_sprintf("%s transport found host %s to be "
3082 "local", tblock->name, host->name);
3083 }
3084 goto END_TRANSPORT;
3085 }
3086 } /* End of block for IP address lookup */
3087
3088 /* If this is a continued delivery, we are interested only in the host
3089 which matches the name of the existing open channel. The check is put
3090 here after the local host lookup, in case the name gets expanded as a
3091 result of the lookup. Set expired FALSE, to save the outer loop executing
3092 twice. */
3093
3094 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3095 Ustrcmp(continue_host_address, host->address) != 0))
3096 {
3097 expired = FALSE;
3098 continue; /* With next host */
3099 }
3100
9c4e8f60
PH
3101 /* Reset the default next host in case a multihomed host whose addresses
3102 are not looked up till just above added to the host list. */
83364d30
PH
3103
3104 nexthost = host->next;
3105
0756eb3c
PH
3106 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3107 domain is in queue_smtp_domains, we don't actually want to attempt any
3108 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3109 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3110 were not in it. We don't want to hold up all SMTP deliveries! Except when
3111 doing a two-stage queue run, don't do this if forcing. */
3112
3113 if ((!deliver_force || queue_2stage) && (queue_smtp ||
cf39cf57
PH
3114 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3115 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3116 {
3117 expired = FALSE;
3118 for (addr = addrlist; addr != NULL; addr = addr->next)
3119 {
3120 if (addr->transport_return != DEFER) continue;
3121 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3122 }
3123 continue; /* With next host */
3124 }
3125
3126 /* Count hosts being considered - purely for an intelligent comment
3127 if none are usable. */
3128
3129 hosts_total++;
3130
3131 /* Set $host and $host address now in case they are needed for the
3132 interface expansion or the serialize_hosts check; they remain set if an
3133 actual delivery happens. */
3134
3135 deliver_host = host->name;
3136 deliver_host_address = host->address;
783b385f
JH
3137 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3138 : host->dnssec == DS_NO ? US"no"
3139 : US"";
0756eb3c 3140
7cd1141b
PH
3141 /* Set up a string for adding to the retry key if the port number is not
3142 the standard SMTP port. A host may have its own port setting that overrides
3143 the default. */
3144
3145 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3146 port : host->port);
3147 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3148
0756eb3c
PH
3149 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3150 string changes upon expansion, we must add it to the key that is used for
3151 retries, because connections to the same host from a different interface
3152 should be treated separately. */
3153
3154 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3155 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3156 &interface, tid))
3157 return FALSE;
3158 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3159
3160 /* The first time round the outer loop, check the status of the host by
3161 inspecting the retry data. The second time round, we are interested only
3162 in expired hosts that haven't been tried since this message arrived. */
3163
3164 if (cutoff_retry == 0)
3165 {
9c695f6d 3166 BOOL incl_ip;
0756eb3c 3167 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3168 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH
3169 messages) and also data for retries of a specific message at this host.
3170 If either of these retry records are actually read, the keys used are
3171 returned to save recomputing them later. */
3172
9c695f6d
JH
3173 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3174 US"retry_include_ip_address", ob->retry_include_ip_address,
3175 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3176 continue; /* with next host */
3177
0756eb3c 3178 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3179 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH
3180
3181 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3182 (host->address == NULL)? US"" : host->address, pistring,
3183 (host->status == hstatus_usable)? "usable" :
3184 (host->status == hstatus_unusable)? "unusable" :
3185 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3186
3187 /* Skip this address if not usable at this time, noting if it wasn't
3188 actually expired, both locally and in the address. */
3189
3190 switch (host->status)
3191 {
3192 case hstatus_unusable:
3193 expired = FALSE;
3194 setflag(addrlist, af_retry_skipped);
3195 /* Fall through */
3196
3197 case hstatus_unusable_expired:
3198 switch (host->why)
3199 {
3200 case hwhy_retry: hosts_retry++; break;
3201 case hwhy_failed: hosts_fail++; break;
3202 case hwhy_deferred: hosts_defer++; break;
3203 }
3204
3205 /* If there was a retry message key, implying that previously there
3206 was a message-specific defer, we don't want to update the list of
f6c332bd 3207 messages waiting for these hosts. */
0756eb3c 3208
f6c332bd 3209 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3210 continue; /* With the next host or IP address */
3211 }
3212 }
3213
3214 /* Second time round the loop: if the address is set but expired, and
3215 the message is newer than the last try, let it through. */
3216
3217 else
3218 {
3219 if (host->address == NULL ||
3220 host->status != hstatus_unusable_expired ||
3221 host->last_try > received_time)
3222 continue;
3223 DEBUG(D_transport)
3224 debug_printf("trying expired host %s [%s]%s\n",
3225 host->name, host->address, pistring);
3226 host_is_expired = TRUE;
3227 }
3228
3229 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3230 it remains TRUE only if all hosts are expired and none are actually tried.
3231 */
3232
3233 expired = FALSE;
3234
3235 /* If this host is listed as one to which access must be serialized,
3236 see if another Exim process has a connection to it, and if so, skip
3237 this host. If not, update the database to record our connection to it
3238 and remember this for later deletion. Do not do any of this if we are
3239 sending the message down a pre-existing connection. */
3240
3241 if (!continuing &&
5130845b 3242 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH
3243 {
3244 serialize_key = string_sprintf("host-serialize-%s", host->name);
3245 if (!enq_start(serialize_key))
3246 {
3247 DEBUG(D_transport)
3248 debug_printf("skipping host %s because another Exim process "
3249 "is connected to it\n", host->name);
3250 hosts_serial++;
3251 continue;
3252 }
3253 serialized = TRUE;
3254 }
3255
3256 /* OK, we have an IP address that is not waiting for its retry time to
3257 arrive (it might be expired) OR (second time round the loop) we have an
3258 expired host that hasn't been tried since the message arrived. Have a go
3259 at delivering the message to it. First prepare the addresses by flushing
3260 out the result of previous attempts, and finding the first address that
3261 is still to be delivered. */
3262
3263 first_addr = prepare_addresses(addrlist, host);
3264
3265 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3266 message_id, host->name, host->address, addrlist->address,
3267 (addrlist->next == NULL)? "" : ", ...");
3268
3269 set_process_info("delivering %s to %s [%s] (%s%s)",
3270 message_id, host->name, host->address, addrlist->address,
3271 (addrlist->next == NULL)? "" : ", ...");
3272
3273 /* This is not for real; don't do the delivery. If there are
3274 any remaining hosts, list them. */
3275
3276 if (dont_deliver)
3277 {
3278 host_item *host2;
c562fd30 3279 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
0756eb3c
PH
3280 for (addr = addrlist; addr != NULL; addr = addr->next)
3281 {
3282 addr->host_used = host;
3283 addr->special_action = '*';
3284 addr->message = US"delivery bypassed by -N option";
3285 }
3286 DEBUG(D_transport)
3287 {
3288 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3289 "*** host and remaining hosts:\n", tblock->name);
3290 for (host2 = host; host2 != NULL; host2 = host2->next)
3291 debug_printf(" %s [%s]\n", host2->name,
3292 (host2->address == NULL)? US"unset" : host2->address);
3293 }
3294 rc = OK;
3295 }
3296
3297 /* This is for real. If the host is expired, we don't count it for
3298 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3299 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3300 lunatic DNS configurations) is reached.
8e669ac1 3301
533244af
PH
3302 If the host is not expired and we are about to hit the hosts_max_retry
3303 limit, check to see if there is a subsequent hosts with a different MX
3304 value. If so, make that the next host, and don't count this one. This is a
3305 heuristic to make sure that different MXs do get tried. With a normal kind
3306 of retry rule, they would get tried anyway when the earlier hosts were
3307 delayed, but if the domain has a "retry every time" type of rule - as is
3308 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH
3309
3310 else
3311 {
d427a7f9
JH
3312 host_item * thost;
3313 /* Make a copy of the host if it is local to this invocation
3314 of the transport. */
3315
3316 if (expanded_hosts)
3317 {
3318 thost = store_get(sizeof(host_item));
3319 *thost = *host;
3320 thost->name = string_copy(host->name);
3321 thost->address = string_copy(host->address);
3322 }
3323 else
3324 thost = host;
3325
0756eb3c
PH
3326 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3327 {
3328 host_item *h;
3329 DEBUG(D_transport)
3330 debug_printf("hosts_max_try limit reached with this host\n");
3331 for (h = host; h != NULL; h = h->next)
3332 if (h->mx != host->mx) break;
3333 if (h != NULL)
3334 {
3335 nexthost = h;
3336 unexpired_hosts_tried--;
3337 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3338 "and will be tried\n");
3339 }
3340 }
3341
3342 /* Attempt the delivery. */
3343
533244af 3344 total_hosts_tried++;
d427a7f9
JH
3345 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3346 &message_defer, FALSE);
0756eb3c
PH
3347
3348 /* Yield is one of:
3349 OK => connection made, each address contains its result;
3350 message_defer is set for message-specific defers (when all
3351 recipients are marked defer)
3352 DEFER => there was a non-message-specific delivery problem;
3353 ERROR => there was a problem setting up the arguments for a filter,
3354 or there was a problem with expanding added headers
3355 */
3356
3357 /* If the result is not OK, there was a non-message-specific problem.
3358 If the result is DEFER, we need to write to the logs saying what happened
3359 for this particular host, except in the case of authentication and TLS
3360 failures, where the log has already been written. If all hosts defer a
3361 general message is written at the end. */
3362
3363 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3364 first_addr->basic_errno != ERRNO_TLSFAILURE)
3365 write_logs(first_addr, host);
3366
774ef2d7 3367#ifdef EXPERIMENTAL_EVENT
d68218c7 3368 if (rc == DEFER)
774ef2d7 3369 deferred_event_raise(first_addr, host);
a7538db1 3370#endif
d68218c7 3371
0756eb3c
PH
3372 /* If STARTTLS was accepted, but there was a failure in setting up the
3373 TLS session (usually a certificate screwup), and the host is not in
3374 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3375 TLS forcibly turned off. We have to start from scratch with a new SMTP
3376 connection. That's why the retry is done from here, not from within
3377 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3378 session, so the in-clear transmission after those errors, if permitted,
3379 happens inside smtp_deliver().] */
3380
a7538db1 3381#ifdef SUPPORT_TLS
7a31d643
JH
3382 if ( rc == DEFER
3383 && first_addr->basic_errno == ERRNO_TLSFAILURE
3384 && ob->tls_tempfail_tryclear
5130845b 3385 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
7a31d643 3386 )
0756eb3c
PH
3387 {
3388 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3389 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3390 first_addr = prepare_addresses(addrlist, host);
d427a7f9
JH
3391 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3392 &message_defer, TRUE);
0756eb3c
PH
3393 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3394 write_logs(first_addr, host);
774ef2d7 3395# ifdef EXPERIMENTAL_EVENT
d68218c7 3396 if (rc == DEFER)
774ef2d7 3397 deferred_event_raise(first_addr, host);
a7538db1 3398# endif
0756eb3c 3399 }
a1bccd48 3400#endif /*SUPPORT_TLS*/
0756eb3c
PH
3401 }
3402
3403 /* Delivery attempt finished */
3404
3405 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3406 US"ERROR" : US"?";
3407
3408 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3409 message_id, host->name, host->address, addrlist->address,
3410 (addrlist->next == NULL)? "" : " (& others)", rs);
3411
3412 /* Release serialization if set up */
3413
3414 if (serialized) enq_end(serialize_key);
3415
3416 /* If the result is DEFER, or if a host retry record is known to exist, we
3417 need to add an item to the retry chain for updating the retry database
3418 at the end of delivery. We only need to add the item to the top address,
3419 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3420 for any other delivery attempts using the same address. (It is copied into
3421 the unusable tree at the outer level, so even if different address blocks
3422 contain the same address, it still won't get tried again.) */
3423
3424 if (rc == DEFER || retry_host_key != NULL)
3425 {
3426 int delete_flag = (rc != DEFER)? rf_delete : 0;
3427 if (retry_host_key == NULL)
3428 {
9c695f6d
JH
3429 BOOL incl_ip;
3430 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3431 US"retry_include_ip_address", ob->retry_include_ip_address,
3432 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3433 incl_ip = TRUE; /* error; use most-specific retry record */
3434
3435 retry_host_key = incl_ip ?
0756eb3c
PH
3436 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3437 string_sprintf("T:%S%s", host->name, pistring);
3438 }
3439
3440 /* If a delivery of another message over an existing SMTP connection
3441 yields DEFER, we do NOT set up retry data for the host. This covers the
3442 case when there are delays in routing the addresses in the second message
3443 that are so long that the server times out. This is alleviated by not
3444 routing addresses that previously had routing defers when handling an
3445 existing connection, but even so, this case may occur (e.g. if a
3446 previously happily routed address starts giving routing defers). If the
3447 host is genuinely down, another non-continued message delivery will
3448 notice it soon enough. */
3449
3450 if (delete_flag != 0 || !continuing)
3451 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3452
3453 /* We may have tried an expired host, if its retry time has come; ensure
3454 the status reflects the expiry for the benefit of any other addresses. */
3455
3456 if (rc == DEFER)
3457 {
3458 host->status = (host_is_expired)?
3459 hstatus_unusable_expired : hstatus_unusable;
3460 host->why = hwhy_deferred;
3461 }
3462 }
3463
3464 /* If message_defer is set (host was OK, but every recipient got deferred
3465 because of some message-specific problem), or if that had happened
3466 previously so that a message retry key exists, add an appropriate item
3467 to the retry chain. Note that if there was a message defer but now there is
3468 a host defer, the message defer record gets deleted. That seems perfectly
3469 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3470 for specific hosts. */
0756eb3c
PH
3471
3472 if (message_defer || retry_message_key != NULL)
3473 {
3474 int delete_flag = message_defer? 0 : rf_delete;
3475 if (retry_message_key == NULL)
3476 {
9c695f6d
JH
3477 BOOL incl_ip;
3478 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3479 US"retry_include_ip_address", ob->retry_include_ip_address,
3480 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3481 incl_ip = TRUE; /* error; use most-specific retry record */
3482
3483 retry_message_key = incl_ip ?
0756eb3c
PH
3484 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3485 message_id) :
3486 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3487 }
3488 retry_add_item(addrlist, retry_message_key,
3489 rf_message | rf_host | delete_flag);
f6c332bd 3490 update_waiting = FALSE;
0756eb3c
PH
3491 }
3492
3493 /* Any return other than DEFER (that is, OK or ERROR) means that the
3494 addresses have got their final statuses filled in for this host. In the OK
3495 case, see if any of them are deferred. */
3496
3497 if (rc == OK)
3498 {
3499 for (addr = addrlist; addr != NULL; addr = addr->next)
3500 {
3501 if (addr->transport_return == DEFER)
3502 {
3503 some_deferred = TRUE;
3504 break;
3505 }
3506 }
3507 }
3508
3509 /* If no addresses deferred or the result was ERROR, return. We do this for
3510 ERROR because a failing filter set-up or add_headers expansion is likely to
3511 fail for any host we try. */
3512
3513 if (rc == ERROR || (rc == OK && !some_deferred))
3514 {
3515 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3516 return TRUE; /* Each address has its status */
3517 }
3518
3519 /* If the result was DEFER or some individual addresses deferred, let
3520