tidying
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
80fea873 5/* Copyright (c) University of Cambridge 1995 - 2016 */
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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
f7572e5a 46 { "dkim_canon", opt_stringptr,
ff5aac2b 47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
f7572e5a 48 { "dkim_domain", opt_stringptr,
ff5aac2b 49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
f7572e5a 50 { "dkim_private_key", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 52 { "dkim_selector", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 54 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 56 { "dkim_strict", opt_stringptr,
ff5aac2b 57 (void *)offsetof(smtp_transport_options_block, dkim.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) },
578897ea 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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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) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 83#ifdef SUPPORT_TLS
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84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 86#endif
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87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 91#ifdef SUPPORT_TLS
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92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 94#endif
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95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 99#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
102#endif
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103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 105#ifdef SUPPORT_TLS
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106# ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
109# endif
f2de3a33 110# ifndef DISABLE_OCSP
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111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
113# endif
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114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 116#endif
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117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 119#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
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120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122#endif
8ccd00b1 123#ifndef DISABLE_PRDR
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124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126#endif
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127#ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130#endif
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131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
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135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
506900af 139 { "multi_domain", opt_expand_bool | opt_public,
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140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 145 { "retry_include_ip_address", opt_expand_bool,
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146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 151#ifdef SUPPORT_SOCKS
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152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154#endif
80a47a2c 155#ifdef SUPPORT_TLS
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156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 164 { "tls_require_ciphers", opt_stringptr,
0756eb3c 165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 174 { "tls_verify_certificates", opt_stringptr,
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175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 178#endif
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179};
180
181/* Size of the options list. An extern variable has to be used so that its
182address can appear in the tables drtables.c. */
183
184int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187/* Default private options block for the smtp transport. */
188
189smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
9e4f5962 199 NULL, /* DSCP */
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200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
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203#ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
7a31d643 205 NULL, /* hosts_require_dane */
96e47838 206#endif
8ccd00b1 207#ifndef DISABLE_PRDR
ad07e9ad 208 US"*", /* hosts_try_prdr */
fd98a5c6 209#endif
f2de3a33 210#ifndef DISABLE_OCSP
0e66b3b6 211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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212 NULL, /* hosts_require_ocsp */
213#endif
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214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
6c9ed72e 216 NULL, /* hosts_verify_avoid_tls */
c51b8e75 217 NULL, /* hosts_avoid_pipelining */
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218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
8e669ac1 226 50, /* hosts_max_try_hardlimit */
48c7f9e2 227 TRUE, /* address_retry_include_sender */
0756eb3c 228 FALSE, /* allow_localhost */
382afc6b 229 FALSE, /* authenticated_sender_force */
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230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
0539a19d 233 { NULL, NULL }, /* dnssec_domains {request,require} */
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234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
f1513293 238 FALSE, /* lmtp_ignore_quota */
9c695f6d 239 NULL, /* expand_retry_include_ip_address */
0756eb3c 240 TRUE /* retry_include_ip_address */
f0989ec0 241#ifdef SUPPORT_SOCKS
7eb6c37c 242 ,NULL /* socks_proxy */
b8bf753b 243#endif
80a47a2c 244#ifdef SUPPORT_TLS
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245 ,NULL, /* tls_certificate */
246 NULL, /* tls_crl */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
54c90be1 249 NULL, /* tls_sni */
0e0f3f56 250 US"system", /* tls_verify_certificates */
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251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
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253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
610ff438 255 US"*", /* tls_try_verify_hosts */
01a4a5c5 256 US"*" /* tls_verify_cert_hostnames */
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257#endif
258#ifndef DISABLE_DKIM
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259 , {NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL} /* dkim_strict */
80a47a2c 265#endif
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266};
267
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268/* some DSN flags for use later */
269
270static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
45500060 273static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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274
275
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276
277/* Local statics */
278
279static uschar *smtp_command; /* Points to last cmd for error messages */
280static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 281static BOOL update_waiting; /* TRUE to update the "wait" database */
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282
283
284/*************************************************
285* Setup entry point *
286*************************************************/
287
288/* This function is called when the transport is about to be used,
289but before running it in a sub-process. It is used for two things:
290
291 (1) To set the fallback host list in addresses, when delivering.
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292 (2) To pass back the interface, port, protocol, and other options, for use
293 during callout verification.
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294
295Arguments:
296 tblock pointer to the transport instance block
297 addrlist list of addresses about to be transported
298 tf if not NULL, pointer to block in which to return options
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299 uid the uid that will be set (not used)
300 gid the gid that will be set (not used)
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301 errmsg place for error message (not used)
302
303Returns: OK always (FAIL, DEFER not used)
304*/
305
306static int
307smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 308 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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309{
310smtp_transport_options_block *ob =
311 (smtp_transport_options_block *)(tblock->options_block);
312
313errmsg = errmsg; /* Keep picky compilers happy */
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314uid = uid;
315gid = gid;
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316
317/* Pass back options if required. This interface is getting very messy. */
318
319if (tf != NULL)
320 {
321 tf->interface = ob->interface;
322 tf->port = ob->port;
323 tf->protocol = ob->protocol;
324 tf->hosts = ob->hosts;
325 tf->hosts_override = ob->hosts_override;
326 tf->hosts_randomize = ob->hosts_randomize;
327 tf->gethostbyname = ob->gethostbyname;
328 tf->qualify_single = ob->dns_qualify_single;
329 tf->search_parents = ob->dns_search_parents;
26da7e20 330 tf->helo_data = ob->helo_data;
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331 }
332
333/* Set the fallback host list for all the addresses that don't have fallback
334host lists, provided that the local host wasn't present in the original host
335list. */
336
337if (!testflag(addrlist, af_local_host_removed))
338 {
339 for (; addrlist != NULL; addrlist = addrlist->next)
340 if (addrlist->fallback_hosts == NULL)
341 addrlist->fallback_hosts = ob->fallback_hostlist;
342 }
343
344return OK;
345}
346
347
348
349/*************************************************
350* Initialization entry point *
351*************************************************/
352
353/* Called for each instance, after its options have been read, to
354enable consistency checks to be done, or anything else that needs
355to be set up.
356
357Argument: pointer to the transport instance block
358Returns: nothing
359*/
360
361void
362smtp_transport_init(transport_instance *tblock)
363{
364smtp_transport_options_block *ob =
365 (smtp_transport_options_block *)(tblock->options_block);
366
367/* Retry_use_local_part defaults FALSE if unset */
368
369if (tblock->retry_use_local_part == TRUE_UNSET)
370 tblock->retry_use_local_part = FALSE;
371
372/* Set the default port according to the protocol */
373
374if (ob->port == NULL)
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375 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
376 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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377
378/* Set up the setup entry point, to be called before subprocesses for this
379transport. */
380
381tblock->setup = smtp_transport_setup;
382
383/* Complain if any of the timeouts are zero. */
384
385if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
386 ob->final_timeout <= 0)
387 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
388 "command, data, or final timeout value is zero for %s transport",
389 tblock->name);
390
391/* If hosts_override is set and there are local hosts, set the global
392flag that stops verify from showing router hosts. */
393
394if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
395
396/* If there are any fallback hosts listed, build a chain of host items
397for them, but do not do any lookups at this time. */
398
399host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
400}
401
402
403
404
405
406/*************************************************
407* Set delivery info into all active addresses *
408*************************************************/
409
410/* Only addresses whose status is >= PENDING are relevant. A lesser
411status means that an address is not currently being processed.
412
413Arguments:
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414 addrlist points to a chain of addresses
415 errno_value to put in each address's errno field
416 msg to put in each address's message field
417 rc to put in each address's transport_return field
418 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 419 host if set, mark addrs as having used this host
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420 smtp_greeting from peer
421 helo_response from peer
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422
423If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425this particular type of timeout.
426
427Returns: nothing
428*/
429
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430static void
431set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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432 BOOL pass_message, host_item * host
433#ifdef EXPERIMENTAL_DSN_INFO
434 , const uschar * smtp_greeting, const uschar * helo_response
435#endif
436 )
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437{
438address_item *addr;
439int orvalue = 0;
440if (errno_value == ERRNO_CONNECTTIMEOUT)
441 {
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
444 }
895fbaf2 445for (addr = addrlist; addr; addr = addr->next)
168dec3b 446 if (addr->transport_return >= PENDING)
447d236c 447 {
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448 addr->basic_errno = errno_value;
449 addr->more_errno |= orvalue;
450 if (msg != NULL)
451 {
452 addr->message = msg;
453 if (pass_message) setflag(addr, af_pass_message);
454 }
455 addr->transport_return = rc;
456 if (host)
895fbaf2 457 {
168dec3b 458 addr->host_used = host;
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459#ifdef EXPERIMENTAL_DSN_INFO
460 if (smtp_greeting)
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
463
464 if (helo_response)
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
467#endif
468 }
447d236c 469 }
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470}
471
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472static void
473set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
474 BOOL pass_message)
475{
476set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
477#ifdef EXPERIMENTAL_DSN_INFO
478 , NULL, NULL
479#endif
480 );
481}
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482
483
484/*************************************************
485* Check an SMTP response *
486*************************************************/
487
488/* This function is given an errno code and the SMTP response buffer
489to analyse, together with the host identification for generating messages. It
490sets an appropriate message and puts the first digit of the response code into
491the yield variable. If no response was actually read, a suitable digit is
492chosen.
493
494Arguments:
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495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an errror message
501 pass_message set TRUE if message is an SMTP response
502
503Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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504*/
505
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506static BOOL
507check_response(host_item *host, int *errno_value, int more_errno,
447d236c 508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
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509{
510uschar *pl = US"";
511
512if (smtp_use_pipelining &&
513 (Ustrcmp(smtp_command, "MAIL") == 0 ||
514 Ustrcmp(smtp_command, "RCPT") == 0 ||
515 Ustrcmp(smtp_command, "DATA") == 0))
516 pl = US"pipelined ";
517
518*yield = '4'; /* Default setting is to give a temporary error */
519
520/* Handle response timeout */
521
522if (*errno_value == ETIMEDOUT)
523 {
c562fd30
JH
524 *message = US string_sprintf("SMTP timeout after %s%s",
525 pl, smtp_command);
0756eb3c
PH
526 if (transport_count > 0)
527 *message = US string_sprintf("%s (%d bytes written)", *message,
528 transport_count);
529 return FALSE;
530 }
531
532/* Handle malformed SMTP response */
533
534if (*errno_value == ERRNO_SMTPFORMAT)
535 {
55414b25 536 const uschar *malfresp = string_printing(buffer);
0756eb3c 537 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
538 *message = *malfresp == 0
539 ? string_sprintf("Malformed SMTP reply (an empty line) "
540 "in response to %s%s", pl, smtp_command)
541 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
542 pl, smtp_command, malfresp);
0756eb3c
PH
543 return FALSE;
544 }
545
546/* Handle a failed filter process error; can't send QUIT as we mustn't
547end the DATA. */
548
549if (*errno_value == ERRNO_FILTER_FAIL)
550 {
35af9f61 551 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 552 more_errno,
35af9f61 553 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
554 return FALSE;
555 }
556
557/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
558end the DATA. */
559
560if (*errno_value == ERRNO_CHHEADER_FAIL)
561 {
562 *message =
563 US string_sprintf("failed to expand headers_add or headers_remove: %s",
564 expand_string_message);
565 return FALSE;
566 }
567
568/* Handle failure to write a complete data block */
569
570if (*errno_value == ERRNO_WRITEINCOMPLETE)
571 {
572 *message = US string_sprintf("failed to write a data block");
573 return FALSE;
574 }
575
8c5d388a 576#ifdef SUPPORT_I18N
250b6871
JH
577/* Handle lack of advertised SMTPUTF8, for international message */
578if (*errno_value == ERRNO_UTF8_FWD)
579 {
f358d5e0 580 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH
581 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 return TRUE;
583 }
584#endif
585
0756eb3c
PH
586/* Handle error responses from the remote mailer. */
587
588if (buffer[0] != 0)
589 {
55414b25 590 const uschar *s = string_printing(buffer);
447d236c 591 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 592 "%s", pl, smtp_command, s);
447d236c 593 *pass_message = TRUE;
0756eb3c
PH
594 *yield = buffer[0];
595 return TRUE;
596 }
597
598/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
599connection closed) case, which causes deferral. An explicit connection reset
600error has the same effect. Otherwise, put the host's identity in the message,
601leaving the errno value to be interpreted as well. In all cases, we have to
602assume the connection is now dead. */
0756eb3c 603
19b9dc85 604if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
605 {
606 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
607 *message = US string_sprintf("Remote host closed connection "
608 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
609 }
610else *message = US string_sprintf("%s [%s]", host->name, host->address);
611
612return FALSE;
613}
614
615
616
617/*************************************************
618* Write error message to logs *
619*************************************************/
620
621/* This writes to the main log and to the message log.
622
623Arguments:
624 addr the address item containing error information
625 host the current host
626
627Returns: nothing
628*/
629
630static void
631write_logs(address_item *addr, host_item *host)
632{
c562fd30
JH
633uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
634
1a47b633
JH
635if (LOGGING(outgoing_port))
636 message = string_sprintf("%s:%d", message,
637 host->port == PORT_NONE ? 25 : host->port);
c562fd30 638if (addr->message)
0756eb3c 639 {
c562fd30 640 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
641 if (addr->basic_errno > 0)
642 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
643 log_write(0, LOG_MAIN, "%s", message);
644 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
645 }
646else
647 {
37f3dc43
JH
648 const uschar * s = exim_errstr(addr->basic_errno);
649 log_write(0, LOG_MAIN, "%s %s", message, s);
650 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
651 }
652}
653
c562fd30
JH
654static void
655msglog_line(host_item * host, uschar * message)
656{
37f3dc43
JH
657deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
658 host->name, host->address, message);
c562fd30
JH
659}
660
0756eb3c
PH
661
662
0cbf2b82 663#ifndef DISABLE_EVENT
d68218c7
JH
664/*************************************************
665* Post-defer action *
666*************************************************/
667
668/* This expands an arbitrary per-transport string.
669 It might, for example, be used to write to the database log.
670
671Arguments:
d68218c7
JH
672 addr the address item containing error information
673 host the current host
674
675Returns: nothing
676*/
677
678static void
774ef2d7 679deferred_event_raise(address_item *addr, host_item *host)
d68218c7 680{
774ef2d7 681uschar * action = addr->transport->event_action;
55414b25 682const uschar * save_domain;
a7538db1
JH
683uschar * save_local;
684
d68218c7 685if (!action)
a7538db1 686 return;
d68218c7 687
a7538db1
JH
688save_domain = deliver_domain;
689save_local = deliver_localpart;
690
691/*XXX would ip & port already be set up? */
692deliver_host_address = string_copy(host->address);
774ef2d7
JH
693deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
694event_defer_errno = addr->basic_errno;
d68218c7
JH
695
696router_name = addr->router->name;
697transport_name = addr->transport->name;
a7538db1
JH
698deliver_domain = addr->domain;
699deliver_localpart = addr->local_part;
700
774ef2d7 701(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
702 addr->message
703 ? addr->basic_errno > 0
704 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
705 : string_copy(addr->message)
706 : addr->basic_errno > 0
707 ? string_copy(US strerror(addr->basic_errno))
708 : NULL);
709
710deliver_localpart = save_local;
711deliver_domain = save_domain;
d68218c7
JH
712router_name = transport_name = NULL;
713}
714#endif
715
0756eb3c
PH
716/*************************************************
717* Synchronize SMTP responses *
718*************************************************/
719
720/* This function is called from smtp_deliver() to receive SMTP responses from
721the server, and match them up with the commands to which they relate. When
722PIPELINING is not in use, this function is called after every command, and is
723therefore somewhat over-engineered, but it is simpler to use a single scheme
724that works both with and without PIPELINING instead of having two separate sets
725of code.
726
727The set of commands that are buffered up with pipelining may start with MAIL
728and may end with DATA; in between are RCPT commands that correspond to the
729addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
730etc.) are never buffered.
731
732Errors after MAIL or DATA abort the whole process leaving the response in the
733buffer. After MAIL, pending responses are flushed, and the original command is
734re-instated in big_buffer for error messages. For RCPT commands, the remote is
735permitted to reject some recipient addresses while accepting others. However
736certain errors clearly abort the whole process. Set the value in
737transport_return to PENDING_OK if the address is accepted. If there is a
738subsequent general error, it will get reset accordingly. If not, it will get
739converted to OK at the end.
740
741Arguments:
48c7f9e2
PH
742 addrlist the complete address list
743 include_affixes TRUE if affixes include in RCPT
744 sync_addr ptr to the ptr of the one to start scanning at (updated)
745 host the host we are connected to
746 count the number of responses to read
747 address_retry_
748 include_sender true if 4xx retry is to include the sender it its key
749 pending_MAIL true if the first response is for MAIL
750 pending_DATA 0 if last command sent was not DATA
751 +1 if previously had a good recipient
752 -1 if not previously had a good recipient
753 inblock incoming SMTP block
754 timeout timeout value
755 buffer buffer for reading response
756 buffsize size of buffer
0756eb3c
PH
757
758Returns: 3 if at least one address had 2xx and one had 5xx
759 2 if at least one address had 5xx but none had 2xx
760 1 if at least one host had a 2xx response, but none had 5xx
761 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
762 -1 timeout while reading RCPT response
763 -2 I/O or other non-response error for RCPT
764 -3 DATA or MAIL failed - errno and buffer set
765*/
766
767static int
768sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
769 address_item **sync_addr, host_item *host, int count,
770 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
771 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
772 int buffsize)
773{
774address_item *addr = *sync_addr;
775int yield = 0;
776
777/* Handle the response for a MAIL command. On error, reinstate the original
778command in big_buffer for error message use, and flush any further pending
779responses before returning, except after I/O errors and timeouts. */
780
781if (pending_MAIL)
782 {
783 count--;
784 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
785 {
786 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
787 if (errno == 0 && buffer[0] != 0)
788 {
789 uschar flushbuffer[4096];
e97957bc
PH
790 int save_errno = 0;
791 if (buffer[0] == '4')
792 {
793 save_errno = ERRNO_MAIL4XX;
794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 }
0756eb3c
PH
796 while (count-- > 0)
797 {
798 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
799 '2', timeout)
800 && (errno != 0 || flushbuffer[0] == 0))
801 break;
802 }
e97957bc 803 errno = save_errno;
0756eb3c 804 }
c562fd30
JH
805
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 while (count-- > 0) /* Mark any pending addrs with the host used */
808 {
809 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
810 addr->host_used = host;
811 addr = addr->next;
812 }
0756eb3c
PH
813 return -3;
814 }
815 }
816
817if (pending_DATA) count--; /* Number of RCPT responses to come */
818
819/* Read and handle the required number of RCPT responses, matching each one up
820with an address by scanning for the next address whose status is PENDING_DEFER.
821*/
822
823while (count-- > 0)
824 {
825 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
826
827 /* The address was accepted */
c562fd30 828 addr->host_used = host;
0756eb3c
PH
829
830 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
831 {
832 yield |= 1;
833 addr->transport_return = PENDING_OK;
834
835 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
836 ensure that any address-specific retry record is expunged. We do this both
837 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
838
839 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
840 {
841 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
842 sender_address);
843 retry_add_item(addr, altkey, rf_delete);
0756eb3c 844 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 845 }
0756eb3c
PH
846 }
847
848 /* Timeout while reading the response */
849
850 else if (errno == ETIMEDOUT)
851 {
c562fd30
JH
852 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
853 transport_rcpt_address(addr, include_affixes));
895fbaf2 854 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 855 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 856 update_waiting = FALSE;
0756eb3c
PH
857 return -1;
858 }
859
860 /* Handle other errors in obtaining an SMTP response by returning -1. This
861 will cause all the addresses to be deferred. Restore the SMTP command in
862 big_buffer for which we are checking the response, so the error message
863 makes sense. */
864
865 else if (errno != 0 || buffer[0] == 0)
866 {
867 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
868 transport_rcpt_address(addr, include_affixes));
869 return -2;
870 }
871
872 /* Handle SMTP permanent and temporary response codes. */
873
874 else
875 {
876 addr->message =
447d236c 877 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
878 "%s", transport_rcpt_address(addr, include_affixes),
879 string_printing(buffer));
447d236c 880 setflag(addr, af_pass_message);
c562fd30 881 msglog_line(host, addr->message);
0756eb3c
PH
882
883 /* The response was 5xx */
884
885 if (buffer[0] == '5')
886 {
887 addr->transport_return = FAIL;
888 yield |= 2;
889 }
890
891 /* The response was 4xx */
892
893 else
894 {
0756eb3c
PH
895 addr->transport_return = DEFER;
896 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 897 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 898
0cbf2b82 899#ifndef DISABLE_EVENT
5ef5dd52
JB
900 event_defer_errno = addr->more_errno;
901 msg_event_raise(US"msg:rcpt:host:defer", addr);
902#endif
903
c562fd30
JH
904 /* Log temporary errors if there are more hosts to be tried.
905 If not, log this last one in the == line. */
0756eb3c 906
c562fd30
JH
907 if (host->next)
908 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 909
0cbf2b82 910#ifndef DISABLE_EVENT
5ef5dd52
JB
911 else
912 msg_event_raise(US"msg:rcpt:defer", addr);
913#endif
914
f6c332bd
PH
915 /* Do not put this message on the list of those waiting for specific
916 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 917
f6c332bd 918 update_waiting = FALSE;
0756eb3c 919
48c7f9e2
PH
920 /* Add a retry item for the address so that it doesn't get tried again
921 too soon. If address_retry_include_sender is true, add the sender address
922 to the retry key. */
0756eb3c 923
48c7f9e2
PH
924 if (address_retry_include_sender)
925 {
926 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
927 sender_address);
928 retry_add_item(addr, altkey, 0);
929 }
930 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
931 }
932 }
933 } /* Loop for next RCPT response */
934
935/* Update where to start at for the next block of responses, unless we
936have already handled all the addresses. */
937
938if (addr != NULL) *sync_addr = addr->next;
939
940/* Handle a response to DATA. If we have not had any good recipients, either
941previously or in this block, the response is ignored. */
942
943if (pending_DATA != 0 &&
944 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
945 {
946 int code;
947 uschar *msg;
447d236c 948 BOOL pass_message;
e97957bc
PH
949 if (pending_DATA > 0 || (yield & 1) != 0)
950 {
951 if (errno == 0 && buffer[0] == '4')
952 {
953 errno = ERRNO_DATA4XX;
954 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
955 }
956 return -3;
957 }
447d236c 958 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
959 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
960 "is in use and there were no good recipients\n", msg);
961 }
962
963/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
964present) received 3xx. If any RCPTs were handled and yielded anything other
965than 4xx, yield will be set non-zero. */
966
967return yield;
968}
969
970
971
fcc8e047
JH
972/* Do the client side of smtp-level authentication */
973/*
974Arguments:
975 buffer EHLO response from server (gets overwritten)
976 addrlist chain of potential addresses to deliver
977 host host to deliver to
978 ob transport options
979 ibp, obp comms channel control blocks
980
981Returns:
982 OK Success, or failed (but not required): global "smtp_authenticated" set
983 DEFER Failed authentication (and was required)
984 ERROR Internal problem
985
986 FAIL_SEND Failed communications - transmit
987 FAIL - response
988*/
989
990int
991smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
992 smtp_transport_options_block *ob, BOOL is_esmtp,
993 smtp_inblock *ibp, smtp_outblock *obp)
994{
a7538db1
JH
995int require_auth;
996uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 997
a7538db1
JH
998smtp_authenticated = FALSE;
999client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1000require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1001
a7538db1
JH
1002if (is_esmtp && !regex_AUTH) regex_AUTH =
1003 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1004 FALSE, TRUE);
fcc8e047 1005
a7538db1
JH
1006if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1007 {
1008 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1009 expand_nmax = -1; /* reset */
fcc8e047 1010
a7538db1
JH
1011 /* Must not do this check until after we have saved the result of the
1012 regex match above. */
fcc8e047 1013
a7538db1 1014 if (require_auth == OK ||
5130845b 1015 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1016 {
1017 auth_instance *au;
1018 fail_reason = US"no common mechanisms were found";
fcc8e047 1019
a7538db1 1020 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1021
a7538db1
JH
1022 /* Scan the configured authenticators looking for one which is configured
1023 for use as a client, which is not suppressed by client_condition, and
1024 whose name matches an authentication mechanism supported by the server.
1025 If one is found, attempt to authenticate by calling its client function.
1026 */
fcc8e047 1027
a7538db1
JH
1028 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1029 {
1030 uschar *p = names;
1031 if (!au->client ||
1032 (au->client_condition != NULL &&
1033 !expand_check_condition(au->client_condition, au->name,
1034 US"client authenticator")))
1035 {
1036 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1037 au->name,
1038 (au->client)? "client_condition is false" :
1039 "not configured as a client");
1040 continue;
1041 }
fcc8e047 1042
a7538db1 1043 /* Loop to scan supported server mechanisms */
fcc8e047 1044
a7538db1
JH
1045 while (*p != 0)
1046 {
1047 int rc;
1048 int len = Ustrlen(au->public_name);
1049 while (isspace(*p)) p++;
fcc8e047 1050
a7538db1
JH
1051 if (strncmpic(au->public_name, p, len) != 0 ||
1052 (p[len] != 0 && !isspace(p[len])))
1053 {
1054 while (*p != 0 && !isspace(*p)) p++;
1055 continue;
1056 }
fcc8e047 1057
a7538db1
JH
1058 /* Found data for a listed mechanism. Call its client entry. Set
1059 a flag in the outblock so that data is overwritten after sending so
1060 that reflections don't show it. */
fcc8e047 1061
a7538db1
JH
1062 fail_reason = US"authentication attempt(s) failed";
1063 obp->authenticating = TRUE;
1064 rc = (au->info->clientcode)(au, ibp, obp,
1065 ob->command_timeout, buffer, bufsize);
1066 obp->authenticating = FALSE;
1067 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1068 au->name, rc);
fcc8e047 1069
a7538db1
JH
1070 /* A temporary authentication failure must hold up delivery to
1071 this host. After a permanent authentication failure, we carry on
1072 to try other authentication methods. If all fail hard, try to
1073 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1074
a7538db1
JH
1075 switch(rc)
1076 {
1077 case OK:
1078 smtp_authenticated = TRUE; /* stops the outer loop */
1079 client_authenticator = au->name;
1080 if (au->set_client_id != NULL)
1081 client_authenticated_id = expand_string(au->set_client_id);
1082 break;
1083
1084 /* Failure after writing a command */
1085
1086 case FAIL_SEND:
1087 return FAIL_SEND;
1088
1089 /* Failure after reading a response */
1090
1091 case FAIL:
1092 if (errno != 0 || buffer[0] != '5') return FAIL;
1093 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1094 au->name, host->name, host->address, buffer);
1095 break;
1096
1097 /* Failure by some other means. In effect, the authenticator
1098 decided it wasn't prepared to handle this case. Typically this
1099 is the result of "fail" in an expansion string. Do we need to
1100 log anything here? Feb 2006: a message is now put in the buffer
1101 if logging is required. */
1102
1103 case CANCELLED:
1104 if (*buffer != 0)
1105 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1106 "authentication H=%s [%s] %s", au->name, host->name,
1107 host->address, buffer);
1108 break;
1109
1110 /* Internal problem, message in buffer. */
1111
1112 case ERROR:
895fbaf2
JH
1113 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1114 DEFER, FALSE);
a7538db1
JH
1115 return ERROR;
1116 }
fcc8e047 1117
a7538db1
JH
1118 break; /* If not authenticated, try next authenticator */
1119 } /* Loop for scanning supported server mechanisms */
1120 } /* Loop for further authenticators */
fcc8e047 1121 }
a7538db1 1122 }
fcc8e047 1123
a7538db1 1124/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1125
a7538db1
JH
1126if (require_auth == OK && !smtp_authenticated)
1127 {
895fbaf2 1128 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1129 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1130 FALSE);
a7538db1
JH
1131 return DEFER;
1132 }
4d8d62b9 1133
a7538db1 1134return OK;
fcc8e047
JH
1135}
1136
1137
1138/* Construct AUTH appendix string for MAIL TO */
1139/*
1140Arguments
1141 buffer to build string
1142 addrlist chain of potential addresses to deliver
1143 ob transport options
1144
1145Globals smtp_authenticated
1146 client_authenticated_sender
1147Return True on error, otherwise buffer has (possibly empty) terminated string
1148*/
1149
1150BOOL
1151smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1152 smtp_transport_options_block *ob)
1153{
1154uschar *local_authenticated_sender = authenticated_sender;
1155
1156#ifdef notdef
1157 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1158#endif
1159
1160if (ob->authenticated_sender != NULL)
1161 {
1162 uschar *new = expand_string(ob->authenticated_sender);
1163 if (new == NULL)
1164 {
1165 if (!expand_string_forcedfail)
1166 {
1167 uschar *message = string_sprintf("failed to expand "
1168 "authenticated_sender: %s", expand_string_message);
895fbaf2 1169 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1170 return TRUE;
1171 }
1172 }
1173 else if (new[0] != 0) local_authenticated_sender = new;
1174 }
1175
1176/* Add the authenticated sender address if present */
1177
1178if ((smtp_authenticated || ob->authenticated_sender_force) &&
1179 local_authenticated_sender != NULL)
1180 {
1181 string_format(buffer, bufsize, " AUTH=%s",
1182 auth_xtextencode(local_authenticated_sender,
1183 Ustrlen(local_authenticated_sender)));
1184 client_authenticated_sender = string_copy(local_authenticated_sender);
1185 }
1186else
1187 *buffer= 0;
1188
1189return FALSE;
1190}
1191
1192
1193
0e66b3b6 1194#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1195/* Lookup TLSA record for host/port.
1196Return: OK success with dnssec; DANE mode
1197 DEFER Do not use this host now, may retry later
1198 FAIL_FORCED No TLSA record; DANE not usable
1199 FAIL Do not use this connection
1200*/
1201
0e66b3b6 1202int
4b0fe319 1203tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1204{
1205/* move this out to host.c given the similarity to dns_lookup() ? */
1206uschar buffer[300];
55414b25 1207const uschar * fullname = buffer;
0e66b3b6
JH
1208
1209/* TLSA lookup string */
1210(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1211
1212switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1213 {
0e66b3b6
JH
1214 case DNS_SUCCEED:
1215 if (!dns_is_secure(dnsa))
1216 {
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 return DEFER;
1219 }
4b0fe319 1220 return OK;
2d5fdd53
JH
1221
1222 case DNS_AGAIN:
1223 return DEFER; /* just defer this TLS'd conn */
1224
1225 case DNS_NOMATCH:
1226 return dane_required ? FAIL : FAIL_FORCED;
1227
1228 default:
1229 case DNS_FAIL:
1230 return dane_required ? FAIL : DEFER;
0e66b3b6 1231 }
0e66b3b6
JH
1232}
1233#endif
1234
1235
a39bd74d
JB
1236
1237typedef struct smtp_compare_s
1238{
1239 uschar *current_sender_address;
1240 struct transport_instance *tblock;
1241} smtp_compare_t;
1242
1243/*
1244Create a unique string that identifies this message, it is based on
1245sender_address, helo_data and tls_certificate if enabled. */
1246
1247static uschar *
1248smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249{
1250address_item * addr1;
1251uschar * if1 = US"";
1252uschar * helo1 = US"";
1253#ifdef SUPPORT_TLS
1254uschar * tlsc1 = US"";
1255#endif
1256uschar * save_sender_address = sender_address;
1257uschar * local_identity = NULL;
1258smtp_transport_options_block * ob =
1259 (smtp_transport_options_block *)tblock->options_block;
1260
1261sender_address = sender;
1262
1263addr1 = deliver_make_addr (sender, TRUE);
1264deliver_set_expansions(addr1);
1265
1266if (ob->interface)
1267 if1 = expand_string(ob->interface);
1268
1269if (ob->helo_data)
1270 helo1 = expand_string(ob->helo_data);
1271
1272#ifdef SUPPORT_TLS
1273if (ob->tls_certificate)
1274 tlsc1 = expand_string(ob->tls_certificate);
1275local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276#else
1277local_identity = string_sprintf ("%s^%s", if1, helo1);
1278#endif
1279
1280deliver_set_expansions(NULL);
1281sender_address = save_sender_address;
1282
1283return local_identity;
1284}
1285
1286
1287
1288/* This routine is a callback that is called from transport_check_waiting.
1289This function will evaluate the incoming message versus the previous
1290message. If the incoming message is using a different local identity then
1291we will veto this new message. */
1292
1293static BOOL
1294smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295{
dadff1d4
HSHR
1296uschar * message_local_identity,
1297 * current_local_identity,
1298 * new_sender_address;
1299
1300current_local_identity =
a39bd74d 1301 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1302
dadff1d4
HSHR
1303if (!(new_sender_address = deliver_get_sender_address(message_id)))
1304 return 0;
1305
1306message_local_identity =
1307 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1308
1309return Ustrcmp(current_local_identity, message_local_identity) == 0;
1310}
1311
1312
1313
9094b84b
JH
1314uschar
1315ehlo_response(uschar * buf, size_t bsize, uschar checks)
1316{
1317#ifdef SUPPORT_TLS
ff5aac2b
JH
1318if ( checks & PEER_OFFERED_TLS
1319 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_TLS;
9094b84b
JH
1321#endif
1322
ff5aac2b
JH
1323if ( checks & PEER_OFFERED_IGNQ
1324 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1325 PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_IGNQ;
9094b84b
JH
1327
1328#ifndef DISABLE_PRDR
ff5aac2b
JH
1329if ( checks & PEER_OFFERED_PRDR
1330 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_PRDR;
9094b84b
JH
1332#endif
1333
1334#ifdef SUPPORT_I18N
ff5aac2b
JH
1335if ( checks & PEER_OFFERED_UTF8
1336 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_UTF8;
9094b84b
JH
1338#endif
1339
ff5aac2b
JH
1340if ( checks & PEER_OFFERED_DSN
1341 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_DSN;
9094b84b 1343
ff5aac2b
JH
1344if ( checks & PEER_OFFERED_PIPE
1345 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1346 PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_PIPE;
9094b84b 1348
ff5aac2b
JH
1349if ( checks & PEER_OFFERED_SIZE
1350 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_SIZE;
9094b84b
JH
1352
1353return checks;
1354}
1355
1356
0756eb3c
PH
1357/*************************************************
1358* Deliver address list to given host *
1359*************************************************/
1360
1361/* If continue_hostname is not null, we get here only when continuing to
1362deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1363input. TLS is never active on a passed channel; the previous process always
1364closes it down before passing the connection on.
0756eb3c
PH
1365
1366Otherwise, we have to make a connection to the remote host, and do the
1367initial protocol exchange.
1368
1369When running as an MUA wrapper, if the sender or any recipient is rejected,
1370temporarily or permanently, we force failure for all recipients.
1371
1372Arguments:
1373 addrlist chain of potential addresses to deliver; only those whose
1374 transport_return field is set to PENDING_DEFER are currently
1375 being processed; others should be skipped - they have either
1376 been delivered to an earlier host or IP address, or been
1377 failed by one of them.
1378 host host to deliver to
1379 host_af AF_INET or AF_INET6
2d280592 1380 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1381 interface interface to bind to, or NULL
1382 tblock transport instance block
0756eb3c
PH
1383 message_defer set TRUE if yield is OK, but all addresses were deferred
1384 because of a non-recipient, non-host failure, that is, a
1385 4xx response to MAIL FROM, DATA, or ".". This is a defer
1386 that is specific to the message.
1387 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1388 a second attempt after TLS initialization fails
1389
1390Returns: OK - the connection was made and the delivery attempted;
1391 the result for each address is in its data block.
1392 DEFER - the connection could not be made, or something failed
1393 while setting up the SMTP session, or there was a
1394 non-message-specific error, such as a timeout.
1395 ERROR - a filter command is specified for this transport,
1396 and there was a problem setting it up; OR helo_data
1397 or add_headers or authenticated_sender is specified
1398 for this transport, and the string failed to expand
1399*/
1400
1401static int
1402smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1403 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1404 BOOL *message_defer, BOOL suppress_tls)
1405{
1406address_item *addr;
1407address_item *sync_addr;
1408address_item *first_addr = addrlist;
1409int yield = OK;
1410int address_count;
1411int save_errno;
1412int rc;
1413time_t start_delivery_time = time(NULL);
1414smtp_transport_options_block *ob =
1415 (smtp_transport_options_block *)(tblock->options_block);
1416BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1417BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1418BOOL ok = FALSE;
1419BOOL send_rset = TRUE;
1420BOOL send_quit = TRUE;
1421BOOL setting_up = TRUE;
1422BOOL completed_address = FALSE;
1423BOOL esmtp = TRUE;
1424BOOL pending_MAIL;
447d236c 1425BOOL pass_message = FALSE;
9094b84b 1426uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
8ccd00b1 1427#ifndef DISABLE_PRDR
fd98a5c6
JH
1428BOOL prdr_active;
1429#endif
8c5d388a 1430#ifdef SUPPORT_I18N
3c8b3577 1431BOOL utf8_needed = FALSE;
7ade712c 1432#endif
6c1c3d1d 1433BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1434#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1435BOOL dane = FALSE;
0539a19d 1436BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1437dns_answer tlsa_dnsa;
1438#endif
0756eb3c
PH
1439smtp_inblock inblock;
1440smtp_outblock outblock;
1441int max_rcpt = tblock->max_addresses;
f1513293 1442uschar *igquotstr = US"";
a39bd74d 1443
895fbaf2
JH
1444#ifdef EXPERIMENTAL_DSN_INFO
1445uschar *smtp_greeting = NULL;
1446uschar *helo_response = NULL;
1447#endif
41c7c167 1448uschar *helo_data = NULL;
a39bd74d 1449
0756eb3c
PH
1450uschar *message = NULL;
1451uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1452uschar *p;
1453uschar buffer[4096];
1454uschar inbuffer[4096];
98470202 1455uschar outbuffer[4096];
0756eb3c
PH
1456
1457suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1458
1459*message_defer = FALSE;
1460smtp_command = US"initial connection";
1461if (max_rcpt == 0) max_rcpt = 999999;
1462
1463/* Set up the buffer for reading SMTP response packets. */
1464
1465inblock.buffer = inbuffer;
1466inblock.buffersize = sizeof(inbuffer);
1467inblock.ptr = inbuffer;
1468inblock.ptrend = inbuffer;
1469
1470/* Set up the buffer for holding SMTP commands while pipelining */
1471
1472outblock.buffer = outbuffer;
1473outblock.buffersize = sizeof(outbuffer);
1474outblock.ptr = outbuffer;
1475outblock.cmd_count = 0;
1476outblock.authenticating = FALSE;
1477
6c512171
PH
1478/* Reset the parameters of a TLS session. */
1479
817d9f57
JH
1480tls_out.bits = 0;
1481tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1482tls_out.ourcert = NULL;
1483tls_out.peercert = NULL;
817d9f57
JH
1484tls_out.peerdn = NULL;
1485#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1486tls_out.sni = NULL;
5b456975 1487#endif
018058b2 1488tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1489
35aba663
JH
1490/* Flip the legacy TLS-related variables over to the outbound set in case
1491they're used in the context of the transport. Don't bother resetting
1492afterward as we're in a subprocess. */
1493
1494tls_modify_variables(&tls_out);
1495
061b7ebd
PP
1496#ifndef SUPPORT_TLS
1497if (smtps)
1498 {
895fbaf2
JH
1499 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1500 DEFER, FALSE);
018058b2 1501 return ERROR;
061b7ebd
PP
1502 }
1503#endif
1504
0756eb3c
PH
1505/* Make a connection to the host if this isn't a continued delivery, and handle
1506the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1507specially so they can be identified for retries. */
1508
1509if (continue_hostname == NULL)
1510 {
a7538db1 1511 /* This puts port into host->port */
0756eb3c 1512 inblock.sock = outblock.sock =
7eb6c37c 1513 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1514
0756eb3c
PH
1515 if (inblock.sock < 0)
1516 {
895fbaf2
JH
1517 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1518 NULL, DEFER, FALSE);
0756eb3c
PH
1519 return DEFER;
1520 }
1521
0e66b3b6
JH
1522#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1523 {
0e66b3b6
JH
1524 tls_out.dane_verified = FALSE;
1525 tls_out.tlsa_usage = 0;
1526
0e66b3b6
JH
1527 if (host->dnssec == DS_YES)
1528 {
4b0fe319
JH
1529 if( dane_required
1530 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6 1531 )
2d5fdd53 1532 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
4b0fe319 1533 {
2d5fdd53
JH
1534 case OK: dane = TRUE; break;
1535 case FAIL_FORCED: break;
1536 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1537 string_sprintf("DANE error: tlsa lookup %s",
1538 rc == DEFER ? "DEFER" : "FAIL"),
1539 rc, FALSE);
1540 return rc;
4b0fe319 1541 }
0e66b3b6
JH
1542 }
1543 else if (dane_required)
1544 {
895fbaf2 1545 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1546 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1547 FAIL, FALSE);
4b0fe319 1548 return FAIL;
0e66b3b6
JH
1549 }
1550
1551 if (dane)
1552 ob->tls_tempfail_tryclear = FALSE;
1553 }
1554#endif /*DANE*/
1555
41c7c167
PH
1556 /* Expand the greeting message while waiting for the initial response. (Makes
1557 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1558 delayed till here so that $sending_interface and $sending_port are set. */
1559
1560 helo_data = expand_string(ob->helo_data);
8c5d388a 1561#ifdef SUPPORT_I18N
810d16ad
JH
1562 if (helo_data)
1563 {
1564 uschar * errstr = NULL;
1565 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1566 {
1567 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1568 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH
1569 yield = DEFER;
1570 goto SEND_QUIT;
1571 }
1572 }
1573#endif
41c7c167 1574
0756eb3c
PH
1575 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1576 is nevertheless a reasonably clean way of programming this kind of logic,
1577 where you want to escape on any error. */
1578
061b7ebd
PP
1579 if (!smtps)
1580 {
895fbaf2
JH
1581 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1582 '2', ob->command_timeout);
1583#ifdef EXPERIMENTAL_DSN_INFO
1584 smtp_greeting = string_copy(buffer);
1585#endif
1586 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1587
0cbf2b82 1588#ifndef DISABLE_EVENT
b30275b8 1589 {
805c9d53
JH
1590 uschar * s;
1591 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1592 : host->dnssec==DS_NO ? US"no" : NULL;
1593 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1594 if (s)
a7538db1 1595 {
895fbaf2 1596 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1597 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1598 DEFER, FALSE);
a7538db1
JH
1599 yield = DEFER;
1600 goto SEND_QUIT;
1601 }
b30275b8 1602 }
a7538db1
JH
1603#endif
1604
061b7ebd
PP
1605 /* Now check if the helo_data expansion went well, and sign off cleanly if
1606 it didn't. */
41c7c167 1607
061b7ebd
PP
1608 if (helo_data == NULL)
1609 {
1610 uschar *message = string_sprintf("failed to expand helo_data: %s",
1611 expand_string_message);
895fbaf2 1612 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1613 yield = DEFER;
1614 goto SEND_QUIT;
1615 }
41c7c167
PH
1616 }
1617
0756eb3c
PH
1618/** Debugging without sending a message
1619addrlist->transport_return = DEFER;
1620goto SEND_QUIT;
1621**/
1622
1623 /* Errors that occur after this point follow an SMTP command, which is
1624 left in big_buffer by smtp_write_command() for use in error messages. */
1625
1626 smtp_command = big_buffer;
1627
1628 /* Tell the remote who we are...
1629
1630 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1631 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1632 greeting is of this form. The assumption was that the far end supports it
1633 properly... but experience shows that there are some that give 5xx responses,
1634 even though the banner includes "ESMTP" (there's a bloody-minded one that
1635 says "ESMTP not spoken here"). Cope with that case.
1636
1637 September 2000: Time has passed, and it seems reasonable now to always send
1638 EHLO at the start. It is also convenient to make the change while installing
1639 the TLS stuff.
1640
1641 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1642 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1643 would be no way to send out the mails, so there is now a host list
1644 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1645 PIPELINING problem as well. Maybe it can also be useful to cure other
1646 problems with broken servers.
1647
1648 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1649 Then somebody tried it with a Microsoft mailer... It seems that all other
1650 mailers use upper case for some reason (the RFC is quite clear about case
1651 independence) so, for peace of mind, I gave in. */
1652
5130845b 1653 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1654
061b7ebd
PP
1655 /* Alas; be careful, since this goto is not an error-out, so conceivably
1656 we might set data between here and the target which we assume to exist
1657 and be usable. I can see this coming back to bite us. */
a7538db1 1658#ifdef SUPPORT_TLS
061b7ebd
PP
1659 if (smtps)
1660 {
1661 tls_offered = TRUE;
1662 suppress_tls = FALSE;
1663 ob->tls_tempfail_tryclear = FALSE;
1664 smtp_command = US"SSL-on-connect";
1665 goto TLS_NEGOTIATE;
1666 }
a7538db1 1667#endif
061b7ebd 1668
0756eb3c
PH
1669 if (esmtp)
1670 {
1671 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1672 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1673 goto SEND_FAILED;
1674 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1675 ob->command_timeout))
1676 {
895fbaf2
JH
1677 if (errno != 0 || buffer[0] == 0 || lmtp)
1678 {
1679#ifdef EXPERIMENTAL_DSN_INFO
1680 helo_response = string_copy(buffer);
1681#endif
1682 goto RESPONSE_FAILED;
1683 }
0756eb3c
PH
1684 esmtp = FALSE;
1685 }
895fbaf2
JH
1686#ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688#endif
0756eb3c
PH
1689 }
1690 else
1691 {
1692 DEBUG(D_transport)
1693 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1694 }
1695
1696 if (!esmtp)
1697 {
895fbaf2
JH
1698 BOOL good_response;
1699
0756eb3c
PH
1700 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1701 goto SEND_FAILED;
895fbaf2
JH
1702 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1703 '2', ob->command_timeout);
1704#ifdef EXPERIMENTAL_DSN_INFO
1705 helo_response = string_copy(buffer);
1706#endif
1707 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1708 }
1709
9094b84b
JH
1710 if (esmtp || lmtp)
1711 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
ff5aac2b 1712 PEER_OFFERED_TLS /* others checked later */
9094b84b 1713 );
f1513293 1714
0756eb3c
PH
1715 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1716
a7538db1 1717#ifdef SUPPORT_TLS
9094b84b 1718 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
7ade712c 1719#endif
0756eb3c
PH
1720 }
1721
1722/* For continuing deliveries down the same channel, the socket is the standard
1723input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1724below). Set up the pointer to where subsequent commands will be left, for
1725error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1726set from the command line if they were set in the process that passed the
1727connection on. */
1728
895fbaf2
JH
1729/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1730as the contine goes via transport_pass_socket() and doublefork and exec.
1731It does not wait. Unclear how we keep separate host's responses
1732separate - we could match up by host ip+port as a bodge. */
1733
0756eb3c
PH
1734else
1735 {
1736 inblock.sock = outblock.sock = fileno(stdin);
1737 smtp_command = big_buffer;
4311097e 1738 host->port = port; /* Record the port that was used */
0756eb3c
PH
1739 }
1740
1741/* If TLS is available on this connection, whether continued or not, attempt to
1742start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1743send another EHLO - the server may give a different answer in secure mode. We
1744use a separate buffer for reading the response to STARTTLS so that if it is
1745negative, the original EHLO data is available for subsequent analysis, should
1746the client not be required to use TLS. If the response is bad, copy the buffer
1747for error analysis. */
1748
1749#ifdef SUPPORT_TLS
5130845b
JH
1750if ( tls_offered
1751 && !suppress_tls
1752 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1753 {
1754 uschar buffer2[4096];
1755 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1756 goto SEND_FAILED;
1757
1758 /* If there is an I/O error, transmission of this message is deferred. If
1759 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1760 false, we also defer. However, if there is a temporary rejection of STARTTLS
1761 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1762 STARTTLS, we carry on. This means we will try to send the message in clear,
1763 unless the host is in hosts_require_tls (tested below). */
1764
1765 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1766 ob->command_timeout))
1767 {
4b0fe319
JH
1768 if ( errno != 0
1769 || buffer2[0] == 0
1770 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1771 )
0dda4340
TK
1772 {
1773 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1774 goto RESPONSE_FAILED;
0dda4340 1775 }
0756eb3c
PH
1776 }
1777
1778 /* STARTTLS accepted: try to negotiate a TLS session. */
1779
1780 else
061b7ebd 1781 TLS_NEGOTIATE:
0756eb3c 1782 {
0e66b3b6
JH
1783 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1784# ifdef EXPERIMENTAL_DANE
1785 , dane ? &tlsa_dnsa : NULL
1786# endif
1787 );
0756eb3c
PH
1788
1789 /* TLS negotiation failed; give an error. From outside, this function may
1790 be called again to try in clear on a new connection, if the options permit
1791 it for this host. */
1792
1793 if (rc != OK)
1794 {
6ebd79ec 1795# ifdef EXPERIMENTAL_DANE
4b0fe319 1796 if (rc == DEFER && dane)
6ebd79ec 1797 {
4b0fe319
JH
1798 log_write(0, LOG_MAIN,
1799 "DANE attempt failed; no TLS connection to %s [%s]",
6ebd79ec 1800 host->name, host->address);
6ebd79ec
JH
1801 }
1802# endif
1803
0756eb3c
PH
1804 save_errno = ERRNO_TLSFAILURE;
1805 message = US"failure while setting up TLS session";
1806 send_quit = FALSE;
1807 goto TLS_FAILED;
1808 }
1809
1810 /* TLS session is set up */
1811
895fbaf2 1812 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1813 if (addr->transport_return == PENDING_DEFER)
1814 {
817d9f57 1815 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1816 addr->ourcert = tls_out.ourcert;
1817 addr->peercert = tls_out.peercert;
817d9f57 1818 addr->peerdn = tls_out.peerdn;
018058b2 1819 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1820 }
0756eb3c
PH
1821 }
1822 }
1823
061b7ebd
PP
1824/* if smtps, we'll have smtp_command set to something else; always safe to
1825reset it here. */
1826smtp_command = big_buffer;
1827
41c7c167
PH
1828/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1829helo_data is null, we are dealing with a connection that was passed from
1830another process, and so we won't have expanded helo_data above. We have to
1831expand it here. $sending_ip_address and $sending_port are set up right at the
1832start of the Exim process (in exim.c). */
0756eb3c 1833
817d9f57 1834if (tls_out.active >= 0)
0756eb3c 1835 {
061b7ebd 1836 char *greeting_cmd;
895fbaf2
JH
1837 BOOL good_response;
1838
41c7c167
PH
1839 if (helo_data == NULL)
1840 {
1841 helo_data = expand_string(ob->helo_data);
1842 if (helo_data == NULL)
1843 {
1844 uschar *message = string_sprintf("failed to expand helo_data: %s",
1845 expand_string_message);
895fbaf2 1846 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH
1847 yield = DEFER;
1848 goto SEND_QUIT;
1849 }
1850 }
1851
0d0e4455 1852 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1853 if (smtps)
1854 {
895fbaf2
JH
1855 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1856 '2', ob->command_timeout);
1857#ifdef EXPERIMENTAL_DSN_INFO
1858 smtp_greeting = string_copy(buffer);
1859#endif
1860 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
1861 }
1862
1863 if (esmtp)
1864 greeting_cmd = "EHLO";
1865 else
1866 {
1867 greeting_cmd = "HELO";
1868 DEBUG(D_transport)
1869 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1870 }
1871
1872 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1873 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1874 goto SEND_FAILED;
895fbaf2
JH
1875 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1876 '2', ob->command_timeout);
1877#ifdef EXPERIMENTAL_DSN_INFO
1878 helo_response = string_copy(buffer);
1879#endif
1880 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1881 }
1882
1883/* If the host is required to use a secure channel, ensure that we
1884have one. */
1885
b4b3528b 1886else if ( smtps
0e66b3b6 1887# ifdef EXPERIMENTAL_DANE
b4b3528b 1888 || dane
0e66b3b6 1889# endif
b4b3528b 1890 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1891 )
0756eb3c
PH
1892 {
1893 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1894 message = string_sprintf("a TLS session is required, but %s",
b4b3528b
JH
1895 tls_offered ? "an attempt to start TLS failed"
1896 : "the server did not offer TLS support");
0756eb3c
PH
1897 goto TLS_FAILED;
1898 }
0e66b3b6 1899#endif /*SUPPORT_TLS*/
0756eb3c
PH
1900
1901/* If TLS is active, we have just started it up and re-done the EHLO command,
1902so its response needs to be analyzed. If TLS is not active and this is a
1903continued session down a previously-used socket, we haven't just done EHLO, so
1904we skip this. */
1905
1906if (continue_hostname == NULL
a7538db1 1907#ifdef SUPPORT_TLS
817d9f57 1908 || tls_out.active >= 0
a7538db1 1909#endif
0756eb3c
PH
1910 )
1911 {
9094b84b
JH
1912 if (esmtp || lmtp)
1913 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1914 0 /* no TLS */
1915 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1916 | PEER_OFFERED_PRDR
1917#ifdef SUPPORT_I18N
1918 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1919 /*XXX if we hand peercaps on to continued-conn processes,
1920 must not depend on this addr */
1921#endif
1922 | PEER_OFFERED_DSN
1923 | PEER_OFFERED_PIPE
1924 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1925 );
1926
f1513293
PH
1927 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1928 lmtp_ignore_quota option was set. */
1929
9094b84b 1930 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 1931
0756eb3c
PH
1932 /* If the response to EHLO specified support for the SIZE parameter, note
1933 this, provided size_addition is non-negative. */
1934
9094b84b 1935 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
0756eb3c
PH
1936
1937 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1938 the current host, esmtp will be false, so PIPELINING can never be used. If
1939 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1940
9094b84b
JH
1941 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1942 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
0756eb3c
PH
1943
1944 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
9094b84b 1945 smtp_use_pipelining ? "" : "not ");
0756eb3c 1946
8ccd00b1 1947#ifndef DISABLE_PRDR
9094b84b
JH
1948 if ( peer_offered & PEER_OFFERED_PRDR
1949 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1950 peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 1951
9094b84b 1952 if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
1953 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1954#endif
1955
6c1c3d1d 1956 /* Note if the server supports DSN */
9094b84b
JH
1957 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1958 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
6c1c3d1d 1959
0756eb3c
PH
1960 /* Note if the response to EHLO specifies support for the AUTH extension.
1961 If it has, check that this host is one we want to authenticate to, and do
1962 the business. The host name and address must be available when the
1963 authenticator's client driver is running. */
1964
fcc8e047
JH
1965 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1966 ob, esmtp, &inblock, &outblock))
0756eb3c 1967 {
fcc8e047
JH
1968 default: goto SEND_QUIT;
1969 case OK: break;
1970 case FAIL_SEND: goto SEND_FAILED;
1971 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1972 }
1973 }
1974
1975/* The setting up of the SMTP call is now complete. Any subsequent errors are
1976message-specific. */
1977
1978setting_up = FALSE;
1979
8c5d388a 1980#ifdef SUPPORT_I18N
9094b84b
JH
1981if (addrlist->prop.utf8_msg)
1982 {
1983 utf8_needed = !addrlist->prop.utf8_downcvt
1984 && !addrlist->prop.utf8_downcvt_maybe;
1985 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1986 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1987 }
1988
7ade712c 1989/* If this is an international message we need the host to speak SMTPUTF8 */
9094b84b 1990if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH
1991 {
1992 errno = ERRNO_UTF8_FWD;
1993 goto RESPONSE_FAILED;
1994 }
1995#endif
1996
0756eb3c
PH
1997/* If there is a filter command specified for this transport, we can now
1998set it up. This cannot be done until the identify of the host is known. */
1999
2000if (tblock->filter_command != NULL)
2001 {
2002 BOOL rc;
2003 uschar buffer[64];
2004 sprintf(CS buffer, "%.50s transport", tblock->name);
2005 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2006 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 2007 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2008
2009 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2010 yield ERROR. */
2011
2012 if (!rc)
2013 {
895fbaf2
JH
2014 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2015 FALSE);
0756eb3c
PH
2016 yield = ERROR;
2017 goto SEND_QUIT;
2018 }
2019 }
2020
2021
2022/* For messages that have more than the maximum number of envelope recipients,
2023we want to send several transactions down the same SMTP connection. (See
2024comments in deliver.c as to how this reconciles, heuristically, with
2025remote_max_parallel.) This optimization was added to Exim after the following
2026code was already working. The simplest way to put it in without disturbing the
2027code was to use a goto to jump back to this point when there is another
2028transaction to handle. */
2029
2030SEND_MESSAGE:
2031sync_addr = first_addr;
2032address_count = 0;
2033ok = FALSE;
2034send_rset = TRUE;
2035completed_address = FALSE;
2036
2037
2038/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2039qualification, send it, adding something to the message size to allow for
2040imprecision and things that get added en route. Exim keeps the number of lines
2041in a message, so we can give an accurate value for the original message, but we
2042need some additional to handle added headers. (Double "." characters don't get
2043included in the count.) */
2044
2045p = buffer;
2046*p = 0;
2047
2048if (smtp_use_size)
2049 {
2050 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2051 while (*p) p++;
2052 }
2053
8ccd00b1 2054#ifndef DISABLE_PRDR
fd98a5c6 2055prdr_active = FALSE;
9094b84b 2056if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
2057 for (addr = first_addr; addr; addr = addr->next)
2058 if (addr->transport_return == PENDING_DEFER)
2059 {
2060 for (addr = addr->next; addr; addr = addr->next)
2061 if (addr->transport_return == PENDING_DEFER)
2062 { /* at least two recipients to send */
2063 prdr_active = TRUE;
2064 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2065 break;
fd98a5c6
JH
2066 }
2067 break;
2068 }
fd98a5c6
JH
2069#endif
2070
8c5d388a 2071#ifdef SUPPORT_I18N
9094b84b
JH
2072if ( addrlist->prop.utf8_msg
2073 && !addrlist->prop.utf8_downcvt
2074 && peer_offered & PEER_OFFERED_UTF8
2075 )
7ade712c
JH
2076 sprintf(CS p, " SMTPUTF8"), p += 9;
2077#endif
2078
6c1c3d1d
WB
2079/* check if all addresses have lasthop flag */
2080/* do not send RET and ENVID if true */
7ade712c 2081for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB
2082 address_count < max_rcpt && addr != NULL;
2083 addr = addr->next)
2084 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2085 {
6c1c3d1d 2086 dsn_all_lasthop = FALSE;
7ade712c
JH
2087 break;
2088 }
6c1c3d1d
WB
2089
2090/* Add any DSN flags to the mail command */
2091
7ade712c 2092if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB
2093 {
2094 if (dsn_ret == dsn_ret_hdrs)
2095 {
ff5aac2b 2096 Ustrcpy(p, " RET=HDRS"); p += 9;
6c1c3d1d
WB
2097 }
2098 else if (dsn_ret == dsn_ret_full)
2099 {
ff5aac2b 2100 Ustrcpy(p, " RET=FULL"); p += 9;
6c1c3d1d
WB
2101 }
2102 if (dsn_envid != NULL)
2103 {
2104 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2105 while (*p) p++;
2106 }
2107 }
6c1c3d1d 2108
6b62e899
JH
2109/* If an authenticated_sender override has been specified for this transport
2110instance, expand it. If the expansion is forced to fail, and there was already
2111an authenticated_sender for this message, the original value will be used.
2112Other expansion failures are serious. An empty result is ignored, but there is
2113otherwise no check - this feature is expected to be used with LMTP and other
2114cases where non-standard addresses (e.g. without domains) might be required. */
2115
fcc8e047 2116if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
2117 {
2118 yield = ERROR;
2119 goto SEND_QUIT;
2120 }
0756eb3c
PH
2121
2122/* From here until we send the DATA command, we can make use of PIPELINING
2123if the server host supports it. The code has to be able to check the responses
2124at any point, for when the buffer fills up, so we write it totally generally.
2125When PIPELINING is off, each command written reports that it has flushed the
2126buffer. */
2127
2128pending_MAIL = TRUE; /* The block starts with MAIL */
2129
3c8b3577
JH
2130 {
2131 uschar * s = return_path;
8c5d388a 2132#ifdef SUPPORT_I18N
3c8b3577
JH
2133 uschar * errstr = NULL;
2134
2135 /* If we must downconvert, do the from-address here. Remember we had to
2136 for the to-addresses (done below), and also (ugly) for re-doing when building
2137 the delivery log line. */
2138
9094b84b
JH
2139 if ( addrlist->prop.utf8_msg
2140 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2141 )
3c8b3577
JH
2142 {
2143 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2144 {
895fbaf2 2145 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH
2146 yield = ERROR;
2147 goto SEND_QUIT;
2148 }
2149 setflag(addrlist, af_utf8_downcvt);
2150 }
2151#endif
2152
2153 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2154 "MAIL FROM:<%s>%s\r\n", s, buffer);
2155 }
2156
0756eb3c
PH
2157mail_command = string_copy(big_buffer); /* Save for later error message */
2158
2159switch(rc)
2160 {
2161 case -1: /* Transmission error */
7ade712c 2162 goto SEND_FAILED;
0756eb3c
PH
2163
2164 case +1: /* Block was sent */
7ade712c 2165 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2166 ob->command_timeout))
e97957bc 2167 {
7ade712c
JH
2168 if (errno == 0 && buffer[0] == '4')
2169 {
2170 errno = ERRNO_MAIL4XX;
2171 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2172 }
2173 goto RESPONSE_FAILED;
e97957bc 2174 }
7ade712c
JH
2175 pending_MAIL = FALSE;
2176 break;
0756eb3c
PH
2177 }
2178
2179/* Pass over all the relevant recipient addresses for this host, which are the
2180ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2181several before we have to read the responses for those seen so far. This
2182checking is done by a subroutine because it also needs to be done at the end.
2183Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2184the next one if not all are sent.
2185
2186In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2187last address because we want to abort if any recipients have any kind of
2188problem, temporary or permanent. We know that all recipient addresses will have
2189the PENDING_DEFER status, because only one attempt is ever made, and we know
2190that max_rcpt will be large, so all addresses will be done at once. */
2191
2192for (addr = first_addr;
ff5aac2b 2193 addr && address_count < max_rcpt;
0756eb3c
PH
2194 addr = addr->next)
2195 {
2196 int count;
2197 BOOL no_flush;
3c8b3577 2198 uschar * rcpt_addr;
0756eb3c 2199
a7538db1 2200 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2201
0756eb3c
PH
2202 if (addr->transport_return != PENDING_DEFER) continue;
2203
2204 address_count++;
ff5aac2b 2205 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
0756eb3c 2206
6c1c3d1d
WB
2207 /* Add any DSN flags to the rcpt command and add to the sent string */
2208
2209 p = buffer;
2210 *p = 0;
2211
ff5aac2b 2212 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
6c1c3d1d
WB
2213 {
2214 if ((addr->dsn_flags & rf_dsnflags) != 0)
2215 {
2216 int i;
2217 BOOL first = TRUE;
45500060 2218 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
2219 while (*p) p++;
2220 for (i = 0; i < 4; i++)
6c1c3d1d
WB
2221 if ((addr->dsn_flags & rf_list[i]) != 0)
2222 {
2223 if (!first) *p++ = ',';
2224 first = FALSE;
45500060 2225 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
2226 while (*p) p++;
2227 }
6c1c3d1d
WB
2228 }
2229
ff5aac2b 2230 if (addr->dsn_orcpt)
a7538db1 2231 {
6c1c3d1d
WB
2232 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2233 addr->dsn_orcpt);
2234 while (*p) p++;
2235 }
2236 }
6c1c3d1d 2237
0756eb3c
PH
2238 /* Now send the RCPT command, and process outstanding responses when
2239 necessary. After a timeout on RCPT, we just end the function, leaving the
2240 yield as OK, because this error can often mean that there is a problem with
2241 just one address, so we don't want to delay the host. */
2242
3c8b3577
JH
2243 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2244
8c5d388a 2245#ifdef SUPPORT_I18N
3c8b3577
JH
2246 {
2247 uschar * dummy_errstr;
2248 if ( testflag(addrlist, af_utf8_downcvt)
2249 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2250 dummy_errstr
2251 ) )
2252 {
2253 errno = ERRNO_EXPANDFAIL;
2254 goto SEND_FAILED;
2255 }
2256 }
2257#endif
2258
6c1c3d1d 2259 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2260 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2261
0756eb3c
PH
2262 if (count < 0) goto SEND_FAILED;
2263 if (count > 0)
2264 {
2265 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2266 &sync_addr, host, count, ob->address_retry_include_sender,
2267 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2268 sizeof(buffer)))
0756eb3c
PH
2269 {
2270 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2271 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2272 break;
2273
2274 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2275 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2276 case 0: /* No 2xx or 5xx, but no probs */
2277 break;
2278
2279 case -1: goto END_OFF; /* Timeout on RCPT */
2280 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2281 }
2282 pending_MAIL = FALSE; /* Dealt with MAIL */
2283 }
2284 } /* Loop for next address */
2285
2286/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2287permanently or temporarily. We should have flushed and synced after the last
2288RCPT. */
2289
2290if (mua_wrapper)
2291 {
2292 address_item *badaddr;
168dec3b
JH
2293 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2294 if (badaddr->transport_return != PENDING_OK)
2295 {
2296 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH
2297 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2298 testflag(badaddr, af_pass_message));
168dec3b
JH
2299 ok = FALSE;
2300 break;
2301 }
0756eb3c
PH
2302 }
2303
2304/* If ok is TRUE, we know we have got at least one good recipient, and must now
2305send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2306have a good recipient buffered up if we are pipelining. We don't want to waste
2307time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2308are pipelining. The responses are all handled by sync_responses(). */
2309
2310if (ok || (smtp_use_pipelining && !mua_wrapper))
2311 {
2312 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2313 if (count < 0) goto SEND_FAILED;
2314 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2315 host, count, ob->address_retry_include_sender, pending_MAIL,
2316 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2317 {
2318 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2319 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2320 break;
2321
2322 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2323 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2324 case 0: break; /* No 2xx or 5xx, but no probs */
2325
2326 case -1: goto END_OFF; /* Timeout on RCPT */
2327 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2328 }
2329 }
2330
2331/* Save the first address of the next batch. */
2332
2333first_addr = addr;
2334
2335/* If there were no good recipients (but otherwise there have been no
2336problems), just set ok TRUE, since we have handled address-specific errors
2337already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2338for handling the SMTP dot-handling protocol, flagging to apply to headers as
2339well as body. Set the appropriate timeout value to be used for each chunk.
2340(Haven't been able to make it work using select() for writing yet.) */
2341
ff5aac2b
JH
2342if (!ok)
2343 ok = TRUE;
2344else
0756eb3c
PH
2345 {
2346 sigalrm_seen = FALSE;
2347 transport_write_timeout = ob->data_timeout;
2348 smtp_command = US"sending data block"; /* For error messages */
2349 DEBUG(D_transport|D_v)
2350 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2351 transport_count = 0;
a7538db1 2352
80a47a2c 2353#ifndef DISABLE_DKIM
4cd12fe9
TK
2354 ok = dkim_transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
4cd12fe9
TK
2361 tblock->add_headers, tblock->remove_headers,
2362 US".", US"..", /* Escaping strings */
2363 tblock->rewrite_rules, tblock->rewrite_existflags,
ff5aac2b 2364 &ob->dkim
4cd12fe9
TK
2365 );
2366#else
0756eb3c
PH
2367 ok = transport_write_message(addrlist, inblock.sock,
2368 topt_use_crlf | topt_end_dot | topt_escape_headers |
2369 (tblock->body_only? topt_no_headers : 0) |
2370 (tblock->headers_only? topt_no_body : 0) |
2371 (tblock->return_path_add? topt_add_return_path : 0) |
2372 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2373 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2374 0, /* No size limit */
2375 tblock->add_headers, tblock->remove_headers,
2376 US".", US"..", /* Escaping strings */
2377 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2378#endif
0756eb3c
PH
2379
2380 /* transport_write_message() uses write() because it is called from other
2381 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2382 it can exit with "Broken pipe" as its error. This really means that the
2383 socket got closed at the far end. */
2384
2385 transport_write_timeout = 0; /* for subsequent transports */
2386
2387 /* Failure can either be some kind of I/O disaster (including timeout),
2388 or the failure of a transport filter or the expansion of added headers. */
2389
2390 if (!ok)
2391 {
2392 buffer[0] = 0; /* There hasn't been a response */
2393 goto RESPONSE_FAILED;
2394 }
2395
2396 /* We used to send the terminating "." explicitly here, but because of
2397 buffering effects at both ends of TCP/IP connections, you don't gain
2398 anything by keeping it separate, so it might as well go in the final
2399 data buffer for efficiency. This is now done by setting the topt_end_dot
2400 flag above. */
2401
2402 smtp_command = US"end of data";
2403
8ccd00b1 2404#ifndef DISABLE_PRDR
fd98a5c6
JH
2405 /* For PRDR we optionally get a partial-responses warning
2406 * followed by the individual responses, before going on with
2407 * the overall response. If we don't get the warning then deal
2408 * with per non-PRDR. */
2409 if(prdr_active)
2410 {
2411 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2412 ob->final_timeout);
2413 if (!ok && errno == 0)
2414 switch(buffer[0])
2415 {
2416 case '2': prdr_active = FALSE;
2417 ok = TRUE;
2418 break;
2419 case '4': errno = ERRNO_DATA4XX;
2420 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2421 break;
2422 }
2423 }
2424 else
2425#endif
2426
2427 /* For non-PRDR SMTP, we now read a single response that applies to the
2428 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2429
e97957bc
PH
2430 if (!lmtp)
2431 {
2432 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2433 ob->final_timeout);
2434 if (!ok && errno == 0 && buffer[0] == '4')
2435 {
2436 errno = ERRNO_DATA4XX;
2437 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2438 }
2439 }
0756eb3c
PH
2440
2441 /* For LMTP, we get back a response for every RCPT command that we sent;
2442 some may be accepted and some rejected. For those that get a response, their
2443 status is fixed; any that are accepted have been handed over, even if later
2444 responses crash - at least, that's how I read RFC 2033.
2445
2446 If all went well, mark the recipient addresses as completed, record which
2447 host/IPaddress they were delivered to, and cut out RSET when sending another
2448 message down the same channel. Write the completed addresses to the journal
2449 now so that they are recorded in case there is a crash of hardware or
2450 software before the spool gets updated. Also record the final SMTP
2451 confirmation if needed (for SMTP only). */
2452
2453 if (ok)
2454 {
2455 int flag = '=';
2456 int delivery_time = (int)(time(NULL) - start_delivery_time);
2457 int len;
0756eb3c
PH
2458 uschar *conf = NULL;
2459 send_rset = FALSE;
2460
0756eb3c
PH
2461 /* Set up confirmation if needed - applies only to SMTP */
2462
d68218c7 2463 if (
0cbf2b82 2464#ifdef DISABLE_EVENT
6c6d6e48 2465 LOGGING(smtp_confirmation) &&
a7538db1 2466#endif
d68218c7
JH
2467 !lmtp
2468 )
0756eb3c 2469 {
55414b25
JH
2470 const uschar *s = string_printing(buffer);
2471 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2472 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2473 }
2474
fd98a5c6 2475 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2476 each one. */
2477
2478 for (addr = addrlist; addr != first_addr; addr = addr->next)
2479 {
2480 if (addr->transport_return != PENDING_OK) continue;
2481
2482 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2483 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2484 address. For temporary errors, add a retry item for the address so that
2485 it doesn't get tried again too soon. */
0756eb3c 2486
8ccd00b1 2487#ifndef DISABLE_PRDR
fd98a5c6
JH
2488 if (lmtp || prdr_active)
2489#else
0756eb3c 2490 if (lmtp)
fd98a5c6 2491#endif
0756eb3c
PH
2492 {
2493 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2494 ob->final_timeout))
2495 {
2496 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2497 addr->message = string_sprintf(
8ccd00b1 2498#ifndef DISABLE_PRDR
fd98a5c6
JH
2499 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2500#else
2501 "LMTP error after %s: %s",
2502#endif
0756eb3c 2503 big_buffer, string_printing(buffer));
75def545
PH
2504 setflag(addr, af_pass_message); /* Allow message to go to user */
2505 if (buffer[0] == '5')
2506 addr->transport_return = FAIL;
2507 else
2508 {
e97957bc
PH
2509 errno = ERRNO_DATA4XX;
2510 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2511 addr->transport_return = DEFER;
8ccd00b1 2512#ifndef DISABLE_PRDR
fd98a5c6
JH
2513 if (!prdr_active)
2514#endif
2515 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2516 }
0756eb3c
PH
2517 continue;
2518 }
2519 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2520 if (LOGGING(smtp_confirmation))
c0ea85ab 2521 {
55414b25
JH
2522 const uschar *s = string_printing(buffer);
2523 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2524 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2525 }
0756eb3c
PH
2526 }
2527
2528 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2529 actual host that was used. */
0756eb3c
PH
2530
2531 addr->transport_return = OK;
2532 addr->more_errno = delivery_time;
d427a7f9 2533 addr->host_used = host;
0756eb3c
PH
2534 addr->special_action = flag;
2535 addr->message = conf;
8ccd00b1 2536#ifndef DISABLE_PRDR
fd98a5c6
JH
2537 if (prdr_active) addr->flags |= af_prdr_used;
2538#endif
0756eb3c
PH
2539 flag = '-';
2540
8ccd00b1 2541#ifndef DISABLE_PRDR
fd98a5c6
JH
2542 if (!prdr_active)
2543#endif
2544 {
2545 /* Update the journal. For homonymic addresses, use the base address plus
2546 the transport name. See lots of comments in deliver.c about the reasons
2547 for the complications when homonyms are involved. Just carry on after
2548 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2549
fd98a5c6
JH
2550 if (testflag(addr, af_homonym))
2551 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2552 else
2553 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2554
895fbaf2 2555 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH
2556 len = Ustrlen(CS buffer);
2557 if (write(journal_fd, buffer, len) != len)
2558 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2559 "%s: %s", buffer, strerror(errno));
2560 }
0756eb3c
PH
2561 }
2562
8ccd00b1 2563#ifndef DISABLE_PRDR
fd98a5c6
JH
2564 if (prdr_active)
2565 {
2566 /* PRDR - get the final, overall response. For any non-success
2567 upgrade all the address statuses. */
2568 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2569 ob->final_timeout);
2570 if (!ok)
2571 {
2572 if(errno == 0 && buffer[0] == '4')
2573 {
2574 errno = ERRNO_DATA4XX;
2575 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2576 }
2577 for (addr = addrlist; addr != first_addr; addr = addr->next)
2578 if (buffer[0] == '5' || addr->transport_return == OK)
2579 addr->transport_return = PENDING_OK; /* allow set_errno action */
2580 goto RESPONSE_FAILED;
2581 }
2582
2583 /* Update the journal, or setup retry. */
2584 for (addr = addrlist; addr != first_addr; addr = addr->next)
2585 if (addr->transport_return == OK)
2586 {
2587 if (testflag(addr, af_homonym))
2588 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2589 else
2590 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2591
895fbaf2 2592 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH
2593 len = Ustrlen(CS buffer);
2594 if (write(journal_fd, buffer, len) != len)
2595 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2596 "%s: %s", buffer, strerror(errno));
2597 }
2598 else if (addr->transport_return == DEFER)
2599 retry_add_item(addr, addr->address_retry_key, -2);
2600 }
2601#endif
2602
0756eb3c
PH
2603 /* Ensure the journal file is pushed out to disk. */
2604
54fc8428 2605 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2606 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2607 strerror(errno));
2608 }
2609 }
2610
2611
2612/* Handle general (not specific to one address) failures here. The value of ok
2613is used to skip over this code on the falling through case. A timeout causes a
2614deferral. Other errors may defer or fail according to the response code, and
2615may set up a special errno value, e.g. after connection chopped, which is
2616assumed if errno == 0 and there is no text in the buffer. If control reaches
2617here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2618the problem is not related to this specific message. */
2619
2620if (!ok)
2621 {
895fbaf2
JH
2622 int code, set_rc;
2623 uschar * set_message;
0756eb3c
PH
2624
2625 RESPONSE_FAILED:
895fbaf2
JH
2626 {
2627 save_errno = errno;
2628 message = NULL;
2629 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2630 buffer, &code, &message, &pass_message);
2631 goto FAILED;
2632 }
0756eb3c
PH
2633
2634 SEND_FAILED:
895fbaf2
JH
2635 {
2636 save_errno = errno;
2637 code = '4';
2638 message = US string_sprintf("send() to %s [%s] failed: %s",
2639 host->name, host->address, strerror(save_errno));
2640 send_quit = FALSE;
2641 goto FAILED;
2642 }
0756eb3c
PH
2643
2644 /* This label is jumped to directly when a TLS negotiation has failed,
2645 or was not done for a host for which it is required. Values will be set
2646 in message and save_errno, and setting_up will always be true. Treat as
2647 a temporary error. */
2648
a7538db1 2649#ifdef SUPPORT_TLS
0756eb3c
PH
2650 TLS_FAILED:
2651 code = '4';
a7538db1 2652#endif
0756eb3c
PH
2653
2654 /* If the failure happened while setting up the call, see if the failure was
2655 a 5xx response (this will either be on connection, or following HELO - a 5xx
2656 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2657 never going to accept them. For other errors during setting up (timeouts or
2658 whatever), defer all addresses, and yield DEFER, so that the host is not
2659 tried again for a while. */
2660
2661 FAILED:
2662 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2663 set_message = message;
0756eb3c
PH
2664
2665 if (setting_up)
2666 {
2667 if (code == '5')
895fbaf2 2668 set_rc = FAIL;
0756eb3c 2669 else
895fbaf2 2670 yield = set_rc = DEFER;
0756eb3c
PH
2671 }
2672
e97957bc 2673 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2674 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2675 the contents of the message rather than a real error on the connection. These
2676 cases are treated in the same way as a 4xx response. This next bit of code
2677 does the classification. */
0756eb3c 2678
e97957bc 2679 else
0756eb3c 2680 {
e97957bc 2681 BOOL message_error;
0756eb3c 2682
e97957bc
PH
2683 switch(save_errno)
2684 {
8c5d388a 2685#ifdef SUPPORT_I18N
250b6871
JH
2686 case ERRNO_UTF8_FWD:
2687 code = '5';
2688 /*FALLTHROUGH*/
2689#endif
e97957bc
PH
2690 case 0:
2691 case ERRNO_MAIL4XX:
2692 case ERRNO_DATA4XX:
250b6871
JH
2693 message_error = TRUE;
2694 break;
0756eb3c 2695
e97957bc 2696 case ETIMEDOUT:
250b6871
JH
2697 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2698 Ustrncmp(smtp_command,"end ",4) == 0;
2699 break;
e97957bc
PH
2700
2701 case ERRNO_SMTPCLOSED:
250b6871
JH
2702 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2703 break;
e97957bc
PH
2704
2705 default:
250b6871
JH
2706 message_error = FALSE;
2707 break;
e97957bc 2708 }
0756eb3c 2709
e97957bc 2710 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2711
e97957bc
PH
2712 (a) negative response or timeout after MAIL
2713 (b) negative response after DATA
2714 (c) negative response or timeout or dropped connection after "."
250b6871 2715 (d) utf8 support required and not offered
0756eb3c 2716
e97957bc
PH
2717 It won't be a negative response or timeout after RCPT, as that is dealt
2718 with separately above. The action in all cases is to set an appropriate
2719 error code for all the addresses, but to leave yield set to OK because the
2720 host itself has not failed. Of course, it might in practice have failed
2721 when we've had a timeout, but if so, we'll discover that at the next
2722 delivery attempt. For a temporary error, set the message_defer flag, and
2723 write to the logs for information if this is not the last host. The error
2724 for the last host will be logged as part of the address's log line. */
2725
2726 if (message_error)
0756eb3c 2727 {
e97957bc 2728 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH
2729
2730 /* If there's an errno, the message contains just the identity of
2731 the host. */
2732
895fbaf2
JH
2733 if (code == '5')
2734 set_rc = FAIL;
2735 else /* Anything other than 5 is treated as temporary */
e97957bc 2736 {
895fbaf2 2737 set_rc = DEFER;
e97957bc
PH
2738 if (save_errno > 0)
2739 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2740 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2741 msglog_line(host, message);
e97957bc
PH
2742 *message_defer = TRUE;
2743 }
2744 }
2745
2746 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2747 ".", or some other transportation error. We defer all addresses and yield
2748 DEFER, except for the case of failed add_headers expansion, or a transport
2749 filter failure, when the yield should be ERROR, to stop it trying other
2750 hosts. */
2751
2752 else
2753 {
895fbaf2 2754 set_rc = DEFER;
e97957bc
PH
2755 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2756 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH
2757 }
2758 }
895fbaf2
JH
2759
2760 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2761#ifdef EXPERIMENTAL_DSN_INFO
2762 , smtp_greeting, helo_response
2763#endif
2764 );
0756eb3c
PH
2765 }
2766
2767
2768/* If all has gone well, send_quit will be set TRUE, implying we can end the
2769SMTP session tidily. However, if there were too many addresses to send in one
2770message (indicated by first_addr being non-NULL) we want to carry on with the
2771rest of them. Also, it is desirable to send more than one message down the SMTP
2772connection if there are several waiting, provided we haven't already sent so
2773many as to hit the configured limit. The function transport_check_waiting looks
2774for a waiting message and returns its id. Then transport_pass_socket tries to
2775set up a continued delivery by passing the socket on to another process. The
2776variable send_rset is FALSE if a message has just been successfully transfered.
2777
2778If we are already sending down a continued channel, there may be further
2779addresses not yet delivered that are aimed at the same host, but which have not
2780been passed in this run of the transport. In this case, continue_more will be
2781true, and all we should do is send RSET if necessary, and return, leaving the
2782channel open.
2783
2784However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2785do not want to continue with other messages down the same channel, because that
2786can lead to looping between two or more messages, all with the same,
2787temporarily failing address(es). [The retry information isn't updated yet, so
2788new processes keep on trying.] We probably also don't want to try more of this
2789message's addresses either.
2790
2791If we have started a TLS session, we have to end it before passing the
2792connection to a new process. However, not all servers can handle this (Exim
2793can), so we do not pass such a connection on if the host matches
2794hosts_nopass_tls. */
2795
2796DEBUG(D_transport)
2797 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2798 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2799 continue_more, yield, (first_addr == NULL)? "":"not ");
2800
2801if (completed_address && ok && send_quit)
2802 {
2803 BOOL more;
a39bd74d
JB
2804 smtp_compare_t t_compare;
2805
2806 t_compare.tblock = tblock;
2807 t_compare.current_sender_address = sender_address;
2808
5130845b
JH
2809 if ( first_addr != NULL
2810 || continue_more
2811 || ( ( tls_out.active < 0
2812 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2813 )
0756eb3c
PH
2814 &&
2815 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
2816 tblock->connection_max_messages, new_message_id, &more,
2817 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2818 ) )
0756eb3c
PH
2819 {
2820 uschar *msg;
447d236c 2821 BOOL pass_message;
0756eb3c
PH
2822
2823 if (send_rset)
2824 {
2825 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2826 {
2827 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2828 host->address, strerror(save_errno));
2829 send_quit = FALSE;
2830 }
2831 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2832 ob->command_timeout)))
2833 {
2834 int code;
447d236c
PH
2835 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2836 &pass_message);
0756eb3c
PH
2837 if (!send_quit)
2838 {
c562fd30
JH
2839 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2840 host->name, host->address, msg);
0756eb3c
PH
2841 }
2842 }
2843 }
2844
2845 /* Either RSET was not needed, or it succeeded */
2846
2847 if (ok)
2848 {
2849 if (first_addr != NULL) /* More addresses still to be sent */
2850 { /* in this run of the transport */
2851 continue_sequence++; /* Causes * in logging */
2852 goto SEND_MESSAGE;
2853 }
2854 if (continue_more) return yield; /* More addresses for another run */
2855
2856 /* Pass the socket to a new Exim process. Before doing so, we must shut
2857 down TLS. Not all MTAs allow for the continuation of the SMTP session
2858 when TLS is shut down. We test for this by sending a new EHLO. If we
2859 don't get a good response, we don't attempt to pass the socket on. */
2860
a7538db1 2861#ifdef SUPPORT_TLS
817d9f57 2862 if (tls_out.active >= 0)
0756eb3c 2863 {
817d9f57 2864 tls_close(FALSE, TRUE);
061b7ebd
PP
2865 if (smtps)
2866 ok = FALSE;
2867 else
2868 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2869 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2870 ob->command_timeout);
0756eb3c 2871 }
a7538db1 2872#endif
0756eb3c
PH
2873
2874 /* If the socket is successfully passed, we musn't send QUIT (or
2875 indeed anything!) from here. */
2876
895fbaf2
JH
2877/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2878propagate it from the initial
2879*/
0756eb3c
PH
2880 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2881 new_message_id, inblock.sock))
2882 {
2883 send_quit = FALSE;
2884 }
2885 }
2886
2887 /* If RSET failed and there are addresses left, they get deferred. */
2888
895fbaf2
JH
2889 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2890#ifdef EXPERIMENTAL_DSN_INFO
2891 , smtp_greeting, helo_response
2892#endif
2893 );
0756eb3c
PH
2894 }
2895 }
2896
2897/* End off tidily with QUIT unless the connection has died or the socket has
2898been passed to another process. There has been discussion on the net about what
2899to do after sending QUIT. The wording of the RFC suggests that it is necessary
2900to wait for a response, but on the other hand, there isn't anything one can do
2901with an error response, other than log it. Exim used to do that. However,
2902further discussion suggested that it is positively advantageous not to wait for
2903the response, but to close the session immediately. This is supposed to move
2904the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2905load from the server. (Hosts that are both servers and clients may not see much
2906difference, of course.) Further discussion indicated that this was safe to do
2907on Unix systems which have decent implementations of TCP/IP that leave the
2908connection around for a while (TIME_WAIT) after the application has gone away.
2909This enables the response sent by the server to be properly ACKed rather than
2910timed out, as can happen on broken TCP/IP implementations on other OS.
2911
2912This change is being made on 31-Jul-98. After over a year of trouble-free
2913operation, the old commented-out code was removed on 17-Sep-99. */
2914
2915SEND_QUIT:
2916if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2917
2918END_OFF:
2919
2920#ifdef SUPPORT_TLS
817d9f57 2921tls_close(FALSE, TRUE);
0756eb3c
PH
2922#endif
2923
2924/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2925works because the NULL setting is passed back to the calling process, and
2926remote_max_parallel is forced to 1 when delivering over an existing connection,
2927
2928If all went well and continue_more is set, we shouldn't actually get here if
2929there are further addresses, as the return above will be taken. However,
2930writing RSET might have failed, or there may be other addresses whose hosts are
2931specified in the transports, and therefore not visible at top level, in which
2932case continue_more won't get set. */
2933
b9d9c5a2 2934HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
f1e894f3 2935(void)close(inblock.sock);
a7538db1 2936
0cbf2b82 2937#ifndef DISABLE_EVENT
774ef2d7 2938(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2939#endif
2940
0756eb3c
PH
2941continue_transport = NULL;
2942continue_hostname = NULL;
2943return yield;
2944}
2945
2946
2947
2948
2949/*************************************************
2950* Closedown entry point *
2951*************************************************/
2952
2953/* This function is called when exim is passed an open smtp channel
2954from another incarnation, but the message which it has been asked
2955to deliver no longer exists. The channel is on stdin.
2956
2957We might do fancy things like looking for another message to send down
2958the channel, but if the one we sought has gone, it has probably been
2959delivered by some other process that itself will seek further messages,
2960so just close down our connection.
2961
2962Argument: pointer to the transport instance block
2963Returns: nothing
2964*/
2965
2966void
2967smtp_transport_closedown(transport_instance *tblock)
2968{
2969smtp_transport_options_block *ob =
2970 (smtp_transport_options_block *)(tblock->options_block);
2971smtp_inblock inblock;
2972smtp_outblock outblock;
2973uschar buffer[256];
2974uschar inbuffer[4096];
2975uschar outbuffer[16];
2976
2977inblock.sock = fileno(stdin);
2978inblock.buffer = inbuffer;
2979inblock.buffersize = sizeof(inbuffer);
2980inblock.ptr = inbuffer;
2981inblock.ptrend = inbuffer;
2982
2983outblock.sock = inblock.sock;
2984outblock.buffersize = sizeof(outbuffer);
2985outblock.buffer = outbuffer;
2986outblock.ptr = outbuffer;
2987outblock.cmd_count = 0;
2988outblock.authenticating = FALSE;
2989
2990(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2991(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2992 ob->command_timeout);
f1e894f3 2993(void)close(inblock.sock);
0756eb3c
PH
2994}
2995
2996
2997
2998/*************************************************
2999* Prepare addresses for delivery *
3000*************************************************/
3001
3002/* This function is called to flush out error settings from previous delivery
3003attempts to other hosts. It also records whether we got here via an MX record
3004or not in the more_errno field of the address. We are interested only in
3005addresses that are still marked DEFER - others may have got delivered to a
3006previously considered IP address. Set their status to PENDING_DEFER to indicate
3007which ones are relevant this time.
3008
3009Arguments:
3010 addrlist the list of addresses
3011 host the host we are delivering to
3012
3013Returns: the first address for this delivery
3014*/
3015
3016static address_item *
3017prepare_addresses(address_item *addrlist, host_item *host)
3018{
3019address_item *first_addr = NULL;
3020address_item *addr;
3021for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
3022 if (addr->transport_return == DEFER)
3023 {
3024 if (first_addr == NULL) first_addr = addr;
3025 addr->transport_return = PENDING_DEFER;
3026 addr->basic_errno = 0;
3027 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3028 addr->message = NULL;
a7538db1 3029#ifdef SUPPORT_TLS
168dec3b
JH
3030 addr->cipher = NULL;
3031 addr->ourcert = NULL;
3032 addr->peercert = NULL;
3033 addr->peerdn = NULL;
3034 addr->ocsp = OCSP_NOT_REQ;
a7538db1 3035#endif
895fbaf2
JH
3036#ifdef EXPERIMENTAL_DSN_INFO
3037 addr->smtp_greeting = NULL;
3038 addr->helo_response = NULL;
3039#endif
168dec3b 3040 }
0756eb3c
PH
3041return first_addr;
3042}
3043
3044
3045
3046/*************************************************
3047* Main entry point *
3048*************************************************/
3049
3050/* See local README for interface details. As this is a remote transport, it is
3051given a chain of addresses to be delivered in one connection, if possible. It
3052always returns TRUE, indicating that each address has its own independent
3053status set, except if there is a setting up problem, in which case it returns
3054FALSE. */
3055
3056BOOL
3057smtp_transport_entry(
3058 transport_instance *tblock, /* data for this instantiation */
3059 address_item *addrlist) /* addresses we are working on */
3060{
3061int cutoff_retry;
3062int port;
3063int hosts_defer = 0;
3064int hosts_fail = 0;
3065int hosts_looked_up = 0;
3066int hosts_retry = 0;
3067int hosts_serial = 0;
3068int hosts_total = 0;
8e669ac1 3069int total_hosts_tried = 0;
0756eb3c
PH
3070address_item *addr;
3071BOOL expired = TRUE;
3072BOOL continuing = continue_hostname != NULL;
3073uschar *expanded_hosts = NULL;
3074uschar *pistring;
3075uschar *tid = string_sprintf("%s transport", tblock->name);
3076smtp_transport_options_block *ob =
3077 (smtp_transport_options_block *)(tblock->options_block);
3078host_item *hostlist = addrlist->host_list;
3079host_item *host = NULL;
3080
3081DEBUG(D_transport)
3082 {
3083 debug_printf("%s transport entered\n", tblock->name);
3084 for (addr = addrlist; addr != NULL; addr = addr->next)
3085 debug_printf(" %s\n", addr->address);
3086 if (continuing) debug_printf("already connected to %s [%s]\n",
3087 continue_hostname, continue_host_address);
3088 }
3089
f6c332bd
PH
3090/* Set the flag requesting that these hosts be added to the waiting
3091database if the delivery fails temporarily or if we are running with
3092queue_smtp or a 2-stage queue run. This gets unset for certain
3093kinds of error, typically those that are specific to the message. */
3094
3095update_waiting = TRUE;
3096
0756eb3c
PH
3097/* If a host list is not defined for the addresses - they must all have the
3098same one in order to be passed to a single transport - or if the transport has
3099a host list with hosts_override set, use the host list supplied with the
3100transport. It is an error for this not to exist. */
3101
3102if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3103 {
3104 if (ob->hosts == NULL)
3105 {
3106 addrlist->message = string_sprintf("%s transport called with no hosts set",
3107 tblock->name);
3108 addrlist->transport_return = PANIC;
3109 return FALSE; /* Only top address has status */
3110 }
3111
3112 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3113 ob->hosts);
3114
3115 /* If the transport's host list contains no '$' characters, and we are not
3116 randomizing, it is fixed and therefore a chain of hosts can be built once
3117 and for all, and remembered for subsequent use by other calls to this
3118 transport. If, on the other hand, the host list does contain '$', or we are
3119 randomizing its order, we have to rebuild it each time. In the fixed case,
3120 as the hosts string will never be used again, it doesn't matter that we
3121 replace all the : characters with zeros. */
3122
3123 if (ob->hostlist == NULL)
3124 {
3125 uschar *s = ob->hosts;
3126
3127 if (Ustrchr(s, '$') != NULL)
3128 {
d427a7f9 3129 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
3130 {
3131 addrlist->message = string_sprintf("failed to expand list of hosts "
3132 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3133 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3134 return FALSE; /* Only top address has status */
3135 }
3136 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3137 "\"%s\"\n", s, expanded_hosts);
3138 s = expanded_hosts;
3139 }
3140 else
3141 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3142
3143 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3144
e276e04b
TF
3145 /* Check that the expansion yielded something useful. */
3146 if (hostlist == NULL)
3147 {
3148 addrlist->message =
3149 string_sprintf("%s transport has empty hosts setting", tblock->name);
3150 addrlist->transport_return = PANIC;
3151 return FALSE; /* Only top address has status */
3152 }
3153
0756eb3c
PH
3154 /* If there was no expansion of hosts, save the host list for
3155 next time. */
3156
d427a7f9 3157 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
3158 }
3159
3160 /* This is not the first time this transport has been run in this delivery;
3161 the host list was built previously. */
3162
55414b25
JH
3163 else
3164 hostlist = ob->hostlist;
0756eb3c
PH
3165 }
3166
3167/* The host list was supplied with the address. If hosts_randomize is set, we
3168must sort it into a random order if it did not come from MX records and has not
3169already been randomized (but don't bother if continuing down an existing
3170connection). */
3171
3172else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3173 {
3174 host_item *newlist = NULL;
3175 while (hostlist != NULL)
3176 {
3177 host_item *h = hostlist;
3178 hostlist = hostlist->next;
3179
3180 h->sort_key = random_number(100);
3181
3182 if (newlist == NULL)
3183 {
3184 h->next = NULL;
3185 newlist = h;
3186 }
3187 else if (h->sort_key < newlist->sort_key)
3188 {
3189 h->next = newlist;
3190 newlist = h;
3191 }
3192 else
3193 {
3194 host_item *hh = newlist;
3195 while (hh->next != NULL)
3196 {
3197 if (h->sort_key < hh->next->sort_key) break;
3198 hh = hh->next;
3199 }
3200 h->next = hh->next;
3201 hh->next = h;
3202 }
3203 }
3204
3205 hostlist = addrlist->host_list = newlist;
3206 }
3207
2d280592 3208/* Sort out the default port. */
0756eb3c
PH
3209
3210if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3211
0756eb3c
PH
3212/* For each host-plus-IP-address on the list:
3213
3214. If this is a continued delivery and the host isn't the one with the
3215 current connection, skip.
3216
3217. If the status is unusable (i.e. previously failed or retry checked), skip.
3218
3219. If no IP address set, get the address, either by turning the name into
3220 an address, calling gethostbyname if gethostbyname is on, or by calling
3221 the DNS. The DNS may yield multiple addresses, in which case insert the
3222 extra ones into the list.
3223
3224. Get the retry data if not previously obtained for this address and set the
3225 field which remembers the state of this address. Skip if the retry time is
3226 not reached. If not, remember whether retry data was found. The retry string
3227 contains both the name and the IP address.
3228
3229. Scan the list of addresses and mark those whose status is DEFER as
3230 PENDING_DEFER. These are the only ones that will be processed in this cycle
3231 of the hosts loop.
3232
3233. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3234 Some addresses may be successfully delivered, others may fail, and yet
3235 others may get temporary errors and so get marked DEFER.
3236
3237. The return from the delivery attempt is OK if a connection was made and a
3238 valid SMTP dialogue was completed. Otherwise it is DEFER.
3239
3240. If OK, add a "remove" retry item for this host/IPaddress, if any.
3241
3242. If fail to connect, or other defer state, add a retry item.
3243
3244. If there are any addresses whose status is still DEFER, carry on to the
3245 next host/IPaddress, unless we have tried the number of hosts given
533244af 3246 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
3247 there is some fancy logic for hosts_max_try that means its limit can be
3248 overstepped in some circumstances.
0756eb3c
PH
3249
3250If we get to the end of the list, all hosts have deferred at least one address,
3251or not reached their retry times. If delay_after_cutoff is unset, it requests a
3252delivery attempt to those hosts whose last try was before the arrival time of
3253the current message. To cope with this, we have to go round the loop a second
3254time. After that, set the status and error data for any addresses that haven't
3255had it set already. */
3256
3257for (cutoff_retry = 0; expired &&
3258 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3259 cutoff_retry++)
3260 {
3261 host_item *nexthost = NULL;
3262 int unexpired_hosts_tried = 0;
3263
3264 for (host = hostlist;
8e669ac1 3265 host != NULL &&
533244af
PH
3266 unexpired_hosts_tried < ob->hosts_max_try &&
3267 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
3268 host = nexthost)
3269 {
3270 int rc;
3271 int host_af;
3272 uschar *rs;
3273 BOOL serialized = FALSE;
3274 BOOL host_is_expired = FALSE;
3275 BOOL message_defer = FALSE;
0756eb3c
PH
3276 BOOL some_deferred = FALSE;
3277 address_item *first_addr = NULL;
3278 uschar *interface = NULL;
3279 uschar *retry_host_key = NULL;
3280 uschar *retry_message_key = NULL;
3281 uschar *serialize_key = NULL;
3282
9c4e8f60
PH
3283 /* Default next host is next host. :-) But this can vary if the
3284 hosts_max_try limit is hit (see below). It may also be reset if a host
3285 address is looked up here (in case the host was multihomed). */
3286
3287 nexthost = host->next;
3288
0756eb3c
PH
3289 /* If the address hasn't yet been obtained from the host name, look it up
3290 now, unless the host is already marked as unusable. If it is marked as
3291 unusable, it means that the router was unable to find its IP address (in
3292 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3293 the lookup failed last time. We don't get this far if *all* MX records
3294 point to non-existent hosts; that is treated as a hard error.
3295
3296 We can just skip this host entirely. When the hosts came from the router,
3297 the address will timeout based on the other host(s); when the address is
3298 looked up below, there is an explicit retry record added.
3299
3300 Note that we mustn't skip unusable hosts if the address is not unset; they
3301 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3302
3303 if (host->address == NULL)
3304 {
322050c2 3305 int new_port, flags;
7cd1141b 3306 host_item *hh;
0756eb3c
PH
3307
3308 if (host->status >= hstatus_unusable)
3309 {
3310 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3311 host->name);
3312 continue;
3313 }
3314
3315 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3316
7cd1141b
PH
3317 /* The host name is permitted to have an attached port. Find it, and
3318 strip it from the name. Just remember it for now. */
3319
3320 new_port = host_item_get_port(host);
3321
3322 /* Count hosts looked up */
3323
0756eb3c
PH
3324 hosts_looked_up++;
3325
3326 /* Find by name if so configured, or if it's an IP address. We don't
3327 just copy the IP address, because we need the test-for-local to happen. */
3328
322050c2
PH
3329 flags = HOST_FIND_BY_A;
3330 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3331 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3332
7e66e54d 3333 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3334 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3335 else
0756eb3c 3336 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3337 &ob->dnssec, /* domains for request/require */
55414b25 3338 NULL, NULL);
0756eb3c 3339
7cd1141b
PH
3340 /* Update the host (and any additional blocks, resulting from
3341 multihoming) with a host-specific port, if any. */
3342
3343 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3344
0756eb3c
PH
3345 /* Failure to find the host at this time (usually DNS temporary failure)
3346 is really a kind of routing failure rather than a transport failure.
3347 Therefore we add a retry item of the routing kind, not to stop us trying
3348 to look this name up here again, but to ensure the address gets timed
3349 out if the failures go on long enough. A complete failure at this point
3350 commonly points to a configuration error, but the best action is still
3351 to carry on for the next host. */
3352
3353 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3354 {
3355 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3356 expired = FALSE;
3357 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3358 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3359 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3360 host->status = hstatus_unusable;
3361
3362 for (addr = addrlist; addr != NULL; addr = addr->next)
3363 {
3364 if (addr->transport_return != DEFER) continue;
3365 addr->basic_errno = ERRNO_UNKNOWNHOST;
3366 addr->message =
3367 string_sprintf("failed to lookup IP address for %s", host->name);
3368 }
3369 continue;
3370 }
3371
3372 /* If the host is actually the local host, we may have a problem, or
3373 there may be some cunning configuration going on. In the problem case,
3374 log things and give up. The default transport status is already DEFER. */
3375
3376 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3377 {
3378 for (addr = addrlist; addr != NULL; addr = addr->next)
3379 {
3380 addr->basic_errno = 0;
3381 addr->message = string_sprintf("%s transport found host %s to be "
3382 "local", tblock->name, host->name);
3383 }
3384 goto END_TRANSPORT;
3385 }
3386 } /* End of block for IP address lookup */
3387
3388 /* If this is a continued delivery, we are interested only in the host
3389 which matches the name of the existing open channel. The check is put
3390 here after the local host lookup, in case the name gets expanded as a
3391 result of the lookup. Set expired FALSE, to save the outer loop executing
3392 twice. */
3393
3394 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3395 Ustrcmp(continue_host_address, host->address) != 0))
3396 {
3397 expired = FALSE;
3398 continue; /* With next host */
3399 }
3400
9c4e8f60
PH
3401 /* Reset the default next host in case a multihomed host whose addresses
3402 are not looked up till just above added to the host list. */
83364d30
PH
3403
3404 nexthost = host->next;
3405
0756eb3c
PH
3406 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3407 domain is in queue_smtp_domains, we don't actually want to attempt any
3408 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3409 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3410 were not in it. We don't want to hold up all SMTP deliveries! Except when
3411 doing a two-stage queue run, don't do this if forcing. */
3412
3413 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH
3414 match_isinlist(addrlist->domain,
3415 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3416 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3417 {
3418 expired = FALSE;
3419 for (addr = addrlist; addr != NULL; addr = addr->next)
3420 {
3421 if (addr->transport_return != DEFER) continue;
3422 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3423 }
3424 continue; /* With next host */
3425 }
3426
3427 /* Count hosts being considered - purely for an intelligent comment
3428 if none are usable. */
3429
3430 hosts_total++;
3431
3432 /* Set $host and $host address now in case they are needed for the
3433 interface expansion or the serialize_hosts check; they remain set if an
3434 actual delivery happens. */
3435
3436 deliver_host = host->name;
3437 deliver_host_address = host->address;
783b385f
JH
3438 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3439 : host->dnssec == DS_NO ? US"no"
3440 : US"";
0756eb3c 3441
7cd1141b
PH
3442