Fix ${extract expansion for use within ${if inlist etc. Bug 1524
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
5a66c31b 5/* Copyright (c) University of Cambridge 1995 - 2014 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
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22 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
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28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 40#ifndef DISABLE_DKIM
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41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 53#endif
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54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
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58 { "dnssec_request_domains", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
60 { "dnssec_require_domains", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
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62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
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64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 70#ifdef SUPPORT_TLS
b1770b6e 71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
2d571266 72 ignore; 4.83 will warn, and a later-still release will remove
17c76198 73 these options, so that using them becomes an error. */
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74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 80#endif
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81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 89#ifdef SUPPORT_TLS
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90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 92#endif
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93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 97#ifdef SUPPORT_TLS
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98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 100#endif
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101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 105#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
108#endif
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109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 111#ifdef SUPPORT_TLS
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112# ifdef EXPERIMENTAL_DANE
113 { "hosts_require_dane", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
115# endif
f2de3a33 116# ifndef DISABLE_OCSP
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117 { "hosts_require_ocsp", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
119# endif
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120 { "hosts_require_tls", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 122#endif
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123 { "hosts_try_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 125#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
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126 { "hosts_try_dane", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
128#endif
8ccd00b1 129#ifndef DISABLE_PRDR
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130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132#endif
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133#ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136#endif
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137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
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141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
80a47a2c 157#ifdef SUPPORT_TLS
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158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 166 { "tls_require_ciphers", opt_stringptr,
0756eb3c 167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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174#ifdef EXPERIMENTAL_CERTNAMES
175 { "tls_verify_cert_hostnames", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
177#endif
0756eb3c 178 { "tls_verify_certificates", opt_stringptr,
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179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 182#endif
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183};
184
185/* Size of the options list. An extern variable has to be used so that its
186address can appear in the tables drtables.c. */
187
188int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
190
191/* Default private options block for the smtp transport. */
192
193smtp_transport_options_block smtp_transport_option_defaults = {
194 NULL, /* hosts */
195 NULL, /* fallback_hosts */
196 NULL, /* hostlist */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
201 NULL, /* port */
202 US"smtp", /* protocol */
9e4f5962 203 NULL, /* DSCP */
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204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
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207#ifdef EXPERIMENTAL_DANE
208 NULL, /* hosts_try_dane */
7a31d643 209 NULL, /* hosts_require_dane */
96e47838 210#endif
8ccd00b1 211#ifndef DISABLE_PRDR
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212 NULL, /* hosts_try_prdr */
213#endif
f2de3a33 214#ifndef DISABLE_OCSP
fca41d5a 215 US"*", /* hosts_request_ocsp (except under DANE) */
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216 NULL, /* hosts_require_ocsp */
217#endif
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218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
99400968 220 US"*", /* hosts_verify_avoid_tls */
c51b8e75 221 NULL, /* hosts_avoid_pipelining */
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222 NULL, /* hosts_avoid_esmtp */
223 NULL, /* hosts_nopass_tls */
224 5*60, /* command_timeout */
225 5*60, /* connect_timeout; shorter system default overrides */
226 5*60, /* data timeout */
227 10*60, /* final timeout */
228 1024, /* size_addition */
229 5, /* hosts_max_try */
8e669ac1 230 50, /* hosts_max_try_hardlimit */
48c7f9e2 231 TRUE, /* address_retry_include_sender */
0756eb3c 232 FALSE, /* allow_localhost */
382afc6b 233 FALSE, /* authenticated_sender_force */
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234 FALSE, /* gethostbyname */
235 TRUE, /* dns_qualify_single */
236 FALSE, /* dns_search_parents */
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237 NULL, /* dnssec_request_domains */
238 NULL, /* dnssec_require_domains */
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239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
f1513293 243 FALSE, /* lmtp_ignore_quota */
0756eb3c 244 TRUE /* retry_include_ip_address */
80a47a2c 245#ifdef SUPPORT_TLS
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246 ,NULL, /* tls_certificate */
247 NULL, /* tls_crl */
248 NULL, /* tls_privatekey */
249 NULL, /* tls_require_ciphers */
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250 NULL, /* gnutls_require_kx */
251 NULL, /* gnutls_require_mac */
252 NULL, /* gnutls_require_proto */
54c90be1 253 NULL, /* tls_sni */
0756eb3c 254 NULL, /* tls_verify_certificates */
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255 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
256 /* tls_dh_min_bits */
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257 TRUE, /* tls_tempfail_tryclear */
258 NULL, /* tls_verify_hosts */
259 NULL /* tls_try_verify_hosts */
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260# ifdef EXPERIMENTAL_CERTNAMES
261 ,NULL /* tls_verify_cert_hostnames */
262# endif
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263#endif
264#ifndef DISABLE_DKIM
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265 ,NULL, /* dkim_canon */
266 NULL, /* dkim_domain */
267 NULL, /* dkim_private_key */
268 NULL, /* dkim_selector */
269 NULL, /* dkim_sign_headers */
270 NULL /* dkim_strict */
80a47a2c 271#endif
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272};
273
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274#ifdef EXPERIMENTAL_DSN
275/* some DSN flags for use later */
276
277static int rf_list[] = {rf_notify_never, rf_notify_success,
278 rf_notify_failure, rf_notify_delay };
279
280static uschar *rf_names[] = { "NEVER", "SUCCESS", "FAILURE", "DELAY" };
281#endif
282
283
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284
285/* Local statics */
286
287static uschar *smtp_command; /* Points to last cmd for error messages */
288static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 289static BOOL update_waiting; /* TRUE to update the "wait" database */
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290
291
292/*************************************************
293* Setup entry point *
294*************************************************/
295
296/* This function is called when the transport is about to be used,
297but before running it in a sub-process. It is used for two things:
298
299 (1) To set the fallback host list in addresses, when delivering.
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300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
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302
303Arguments:
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
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307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
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309 errmsg place for error message (not used)
310
311Returns: OK always (FAIL, DEFER not used)
312*/
313
314static int
315smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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317{
318smtp_transport_options_block *ob =
319 (smtp_transport_options_block *)(tblock->options_block);
320
321errmsg = errmsg; /* Keep picky compilers happy */
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322uid = uid;
323gid = gid;
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324
325/* Pass back options if required. This interface is getting very messy. */
326
327if (tf != NULL)
328 {
329 tf->interface = ob->interface;
330 tf->port = ob->port;
331 tf->protocol = ob->protocol;
332 tf->hosts = ob->hosts;
333 tf->hosts_override = ob->hosts_override;
334 tf->hosts_randomize = ob->hosts_randomize;
335 tf->gethostbyname = ob->gethostbyname;
336 tf->qualify_single = ob->dns_qualify_single;
337 tf->search_parents = ob->dns_search_parents;
26da7e20 338 tf->helo_data = ob->helo_data;
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339 }
340
341/* Set the fallback host list for all the addresses that don't have fallback
342host lists, provided that the local host wasn't present in the original host
343list. */
344
345if (!testflag(addrlist, af_local_host_removed))
346 {
347 for (; addrlist != NULL; addrlist = addrlist->next)
348 if (addrlist->fallback_hosts == NULL)
349 addrlist->fallback_hosts = ob->fallback_hostlist;
350 }
351
352return OK;
353}
354
355
356
357/*************************************************
358* Initialization entry point *
359*************************************************/
360
361/* Called for each instance, after its options have been read, to
362enable consistency checks to be done, or anything else that needs
363to be set up.
364
365Argument: pointer to the transport instance block
366Returns: nothing
367*/
368
369void
370smtp_transport_init(transport_instance *tblock)
371{
372smtp_transport_options_block *ob =
373 (smtp_transport_options_block *)(tblock->options_block);
374
375/* Retry_use_local_part defaults FALSE if unset */
376
377if (tblock->retry_use_local_part == TRUE_UNSET)
378 tblock->retry_use_local_part = FALSE;
379
380/* Set the default port according to the protocol */
381
382if (ob->port == NULL)
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383 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
384 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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385
386/* Set up the setup entry point, to be called before subprocesses for this
387transport. */
388
389tblock->setup = smtp_transport_setup;
390
391/* Complain if any of the timeouts are zero. */
392
393if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
394 ob->final_timeout <= 0)
395 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
396 "command, data, or final timeout value is zero for %s transport",
397 tblock->name);
398
399/* If hosts_override is set and there are local hosts, set the global
400flag that stops verify from showing router hosts. */
401
402if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
403
404/* If there are any fallback hosts listed, build a chain of host items
405for them, but do not do any lookups at this time. */
406
407host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 408
32d07012 409#ifdef SUPPORT_TLS
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410if ( ob->gnutls_require_kx
411 || ob->gnutls_require_mac
412 || ob->gnutls_require_proto)
413 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
414 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
415 " are obsolete\n");
32d07012 416#endif
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417}
418
419
420
421
422
423/*************************************************
424* Set delivery info into all active addresses *
425*************************************************/
426
427/* Only addresses whose status is >= PENDING are relevant. A lesser
428status means that an address is not currently being processed.
429
430Arguments:
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431 addrlist points to a chain of addresses
432 errno_value to put in each address's errno field
433 msg to put in each address's message field
434 rc to put in each address's transport_return field
435 pass_message if TRUE, set the "pass message" flag in the address
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436
437If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
438the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
439this particular type of timeout.
440
441Returns: nothing
442*/
443
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444static void
445set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
447d236c 446 BOOL pass_message)
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447{
448address_item *addr;
449int orvalue = 0;
450if (errno_value == ERRNO_CONNECTTIMEOUT)
451 {
452 errno_value = ETIMEDOUT;
453 orvalue = RTEF_CTOUT;
454 }
455for (addr = addrlist; addr != NULL; addr = addr->next)
456 {
457 if (addr->transport_return < PENDING) continue;
458 addr->basic_errno = errno_value;
459 addr->more_errno |= orvalue;
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460 if (msg != NULL)
461 {
462 addr->message = msg;
463 if (pass_message) setflag(addr, af_pass_message);
464 }
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465 addr->transport_return = rc;
466 }
467}
468
469
470
471/*************************************************
472* Check an SMTP response *
473*************************************************/
474
475/* This function is given an errno code and the SMTP response buffer
476to analyse, together with the host identification for generating messages. It
477sets an appropriate message and puts the first digit of the response code into
478the yield variable. If no response was actually read, a suitable digit is
479chosen.
480
481Arguments:
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482 host the current host, to get its name for messages
483 errno_value pointer to the errno value
484 more_errno from the top address for use with ERRNO_FILTER_FAIL
485 buffer the SMTP response buffer
486 yield where to put a one-digit SMTP response code
487 message where to put an errror message
488 pass_message set TRUE if message is an SMTP response
489
490Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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491*/
492
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493static BOOL
494check_response(host_item *host, int *errno_value, int more_errno,
447d236c 495 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
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496{
497uschar *pl = US"";
498
499if (smtp_use_pipelining &&
500 (Ustrcmp(smtp_command, "MAIL") == 0 ||
501 Ustrcmp(smtp_command, "RCPT") == 0 ||
502 Ustrcmp(smtp_command, "DATA") == 0))
503 pl = US"pipelined ";
504
505*yield = '4'; /* Default setting is to give a temporary error */
506
507/* Handle response timeout */
508
509if (*errno_value == ETIMEDOUT)
510 {
511 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
512 "after %s%s", host->name, host->address, pl, smtp_command);
513 if (transport_count > 0)
514 *message = US string_sprintf("%s (%d bytes written)", *message,
515 transport_count);
516 return FALSE;
517 }
518
519/* Handle malformed SMTP response */
520
521if (*errno_value == ERRNO_SMTPFORMAT)
522 {
523 uschar *malfresp = string_printing(buffer);
524 while (isspace(*malfresp)) malfresp++;
525 if (*malfresp == 0)
526 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
527 "%s [%s] in response to %s%s", host->name, host->address, pl,
528 smtp_command);
529 else
530 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
531 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
532 return FALSE;
533 }
534
535/* Handle a failed filter process error; can't send QUIT as we mustn't
536end the DATA. */
537
538if (*errno_value == ERRNO_FILTER_FAIL)
539 {
35af9f61 540 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 541 more_errno,
35af9f61 542 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
543 return FALSE;
544 }
545
546/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
547end the DATA. */
548
549if (*errno_value == ERRNO_CHHEADER_FAIL)
550 {
551 *message =
552 US string_sprintf("failed to expand headers_add or headers_remove: %s",
553 expand_string_message);
554 return FALSE;
555 }
556
557/* Handle failure to write a complete data block */
558
559if (*errno_value == ERRNO_WRITEINCOMPLETE)
560 {
561 *message = US string_sprintf("failed to write a data block");
562 return FALSE;
563 }
564
565/* Handle error responses from the remote mailer. */
566
567if (buffer[0] != 0)
568 {
569 uschar *s = string_printing(buffer);
447d236c 570 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
0756eb3c 571 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
447d236c 572 *pass_message = TRUE;
0756eb3c
PH
573 *yield = buffer[0];
574 return TRUE;
575 }
576
577/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
578connection closed) case, which causes deferral. An explicit connection reset
579error has the same effect. Otherwise, put the host's identity in the message,
580leaving the errno value to be interpreted as well. In all cases, we have to
581assume the connection is now dead. */
0756eb3c 582
19b9dc85 583if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
584 {
585 *errno_value = ERRNO_SMTPCLOSED;
586 *message = US string_sprintf("Remote host %s [%s] closed connection "
587 "in response to %s%s", host->name, host->address, pl, smtp_command);
588 }
589else *message = US string_sprintf("%s [%s]", host->name, host->address);
590
591return FALSE;
592}
593
594
595
596/*************************************************
597* Write error message to logs *
598*************************************************/
599
600/* This writes to the main log and to the message log.
601
602Arguments:
603 addr the address item containing error information
604 host the current host
605
606Returns: nothing
607*/
608
609static void
610write_logs(address_item *addr, host_item *host)
611{
612if (addr->message != NULL)
613 {
614 uschar *message = addr->message;
615 if (addr->basic_errno > 0)
616 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
617 log_write(0, LOG_MAIN, "%s", message);
618 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
619 }
620else
621 {
7cd1141b
PH
622 uschar *msg =
623 ((log_extra_selector & LX_outgoing_port) != 0)?
624 string_sprintf("%s [%s]:%d", host->name, host->address,
625 (host->port == PORT_NONE)? 25 : host->port)
626 :
627 string_sprintf("%s [%s]", host->name, host->address);
628 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
629 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
0756eb3c
PH
630 strerror(addr->basic_errno));
631 }
632}
633
634
635
d68218c7
JH
636#ifdef EXPERIMENTAL_TPDA
637/*************************************************
638* Post-defer action *
639*************************************************/
640
641/* This expands an arbitrary per-transport string.
642 It might, for example, be used to write to the database log.
643
644Arguments:
d68218c7
JH
645 addr the address item containing error information
646 host the current host
647
648Returns: nothing
649*/
650
651static void
a7538db1 652tpda_deferred(address_item *addr, host_item *host)
d68218c7 653{
a7538db1
JH
654uschar * action = addr->transport->tpda_event_action;
655uschar * save_domain;
656uschar * save_local;
657
d68218c7 658if (!action)
a7538db1 659 return;
d68218c7 660
a7538db1
JH
661save_domain = deliver_domain;
662save_local = deliver_localpart;
663
664/*XXX would ip & port already be set up? */
665deliver_host_address = string_copy(host->address);
666deliver_host_port = (host->port == PORT_NONE)? 25 : host->port;
667tpda_defer_errno = addr->basic_errno;
d68218c7
JH
668
669router_name = addr->router->name;
670transport_name = addr->transport->name;
a7538db1
JH
671deliver_domain = addr->domain;
672deliver_localpart = addr->local_part;
673
674(void) tpda_raise_event(action, US"msg:host:defer",
675 addr->message
676 ? addr->basic_errno > 0
677 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
678 : string_copy(addr->message)
679 : addr->basic_errno > 0
680 ? string_copy(US strerror(addr->basic_errno))
681 : NULL);
682
683deliver_localpart = save_local;
684deliver_domain = save_domain;
d68218c7
JH
685router_name = transport_name = NULL;
686}
687#endif
688
689
690
0756eb3c
PH
691/*************************************************
692* Synchronize SMTP responses *
693*************************************************/
694
695/* This function is called from smtp_deliver() to receive SMTP responses from
696the server, and match them up with the commands to which they relate. When
697PIPELINING is not in use, this function is called after every command, and is
698therefore somewhat over-engineered, but it is simpler to use a single scheme
699that works both with and without PIPELINING instead of having two separate sets
700of code.
701
702The set of commands that are buffered up with pipelining may start with MAIL
703and may end with DATA; in between are RCPT commands that correspond to the
704addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
705etc.) are never buffered.
706
707Errors after MAIL or DATA abort the whole process leaving the response in the
708buffer. After MAIL, pending responses are flushed, and the original command is
709re-instated in big_buffer for error messages. For RCPT commands, the remote is
710permitted to reject some recipient addresses while accepting others. However
711certain errors clearly abort the whole process. Set the value in
712transport_return to PENDING_OK if the address is accepted. If there is a
713subsequent general error, it will get reset accordingly. If not, it will get
714converted to OK at the end.
715
716Arguments:
48c7f9e2
PH
717 addrlist the complete address list
718 include_affixes TRUE if affixes include in RCPT
719 sync_addr ptr to the ptr of the one to start scanning at (updated)
720 host the host we are connected to
721 count the number of responses to read
722 address_retry_
723 include_sender true if 4xx retry is to include the sender it its key
724 pending_MAIL true if the first response is for MAIL
725 pending_DATA 0 if last command sent was not DATA
726 +1 if previously had a good recipient
727 -1 if not previously had a good recipient
728 inblock incoming SMTP block
729 timeout timeout value
730 buffer buffer for reading response
731 buffsize size of buffer
0756eb3c
PH
732
733Returns: 3 if at least one address had 2xx and one had 5xx
734 2 if at least one address had 5xx but none had 2xx
735 1 if at least one host had a 2xx response, but none had 5xx
736 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
737 -1 timeout while reading RCPT response
738 -2 I/O or other non-response error for RCPT
739 -3 DATA or MAIL failed - errno and buffer set
740*/
741
742static int
743sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
744 address_item **sync_addr, host_item *host, int count,
745 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
746 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
747 int buffsize)
748{
749address_item *addr = *sync_addr;
750int yield = 0;
751
752/* Handle the response for a MAIL command. On error, reinstate the original
753command in big_buffer for error message use, and flush any further pending
754responses before returning, except after I/O errors and timeouts. */
755
756if (pending_MAIL)
757 {
758 count--;
759 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
760 {
761 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
762 if (errno == 0 && buffer[0] != 0)
763 {
764 uschar flushbuffer[4096];
e97957bc
PH
765 int save_errno = 0;
766 if (buffer[0] == '4')
767 {
768 save_errno = ERRNO_MAIL4XX;
769 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
770 }
0756eb3c
PH
771 while (count-- > 0)
772 {
773 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
774 '2', timeout)
775 && (errno != 0 || flushbuffer[0] == 0))
776 break;
777 }
e97957bc 778 errno = save_errno;
0756eb3c
PH
779 }
780 return -3;
781 }
782 }
783
784if (pending_DATA) count--; /* Number of RCPT responses to come */
785
786/* Read and handle the required number of RCPT responses, matching each one up
787with an address by scanning for the next address whose status is PENDING_DEFER.
788*/
789
790while (count-- > 0)
791 {
792 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
793
794 /* The address was accepted */
795
796 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
797 {
798 yield |= 1;
799 addr->transport_return = PENDING_OK;
800
801 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
802 ensure that any address-specific retry record is expunged. We do this both
803 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
804
805 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
806 {
807 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
808 sender_address);
809 retry_add_item(addr, altkey, rf_delete);
0756eb3c 810 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 811 }
0756eb3c
PH
812 }
813
814 /* Timeout while reading the response */
815
816 else if (errno == ETIMEDOUT)
817 {
818 int save_errno = errno;
819 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
820 "after RCPT TO:<%s>", host->name, host->address,
821 transport_rcpt_address(addr, include_affixes));
447d236c 822 set_errno(addrlist, save_errno, message, DEFER, FALSE);
0756eb3c 823 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 824 update_waiting = FALSE;
0756eb3c
PH
825 return -1;
826 }
827
828 /* Handle other errors in obtaining an SMTP response by returning -1. This
829 will cause all the addresses to be deferred. Restore the SMTP command in
830 big_buffer for which we are checking the response, so the error message
831 makes sense. */
832
833 else if (errno != 0 || buffer[0] == 0)
834 {
835 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
836 transport_rcpt_address(addr, include_affixes));
837 return -2;
838 }
839
840 /* Handle SMTP permanent and temporary response codes. */
841
842 else
843 {
844 addr->message =
447d236c 845 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
0756eb3c
PH
846 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
847 host->name, host->address, string_printing(buffer));
447d236c 848 setflag(addr, af_pass_message);
0756eb3c
PH
849 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
850
851 /* The response was 5xx */
852
853 if (buffer[0] == '5')
854 {
855 addr->transport_return = FAIL;
856 yield |= 2;
857 }
858
859 /* The response was 4xx */
860
861 else
862 {
0756eb3c
PH
863 addr->transport_return = DEFER;
864 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 865 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c
PH
866
867 /* Log temporary errors if there are more hosts to be tried. */
868
869 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
870
f6c332bd
PH
871 /* Do not put this message on the list of those waiting for specific
872 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 873
f6c332bd 874 update_waiting = FALSE;
0756eb3c 875
48c7f9e2
PH
876 /* Add a retry item for the address so that it doesn't get tried again
877 too soon. If address_retry_include_sender is true, add the sender address
878 to the retry key. */
0756eb3c 879
48c7f9e2
PH
880 if (address_retry_include_sender)
881 {
882 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
883 sender_address);
884 retry_add_item(addr, altkey, 0);
885 }
886 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
887 }
888 }
889 } /* Loop for next RCPT response */
890
891/* Update where to start at for the next block of responses, unless we
892have already handled all the addresses. */
893
894if (addr != NULL) *sync_addr = addr->next;
895
896/* Handle a response to DATA. If we have not had any good recipients, either
897previously or in this block, the response is ignored. */
898
899if (pending_DATA != 0 &&
900 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
901 {
902 int code;
903 uschar *msg;
447d236c 904 BOOL pass_message;
e97957bc
PH
905 if (pending_DATA > 0 || (yield & 1) != 0)
906 {
907 if (errno == 0 && buffer[0] == '4')
908 {
909 errno = ERRNO_DATA4XX;
910 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
911 }
912 return -3;
913 }
447d236c 914 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
915 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
916 "is in use and there were no good recipients\n", msg);
917 }
918
919/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
920present) received 3xx. If any RCPTs were handled and yielded anything other
921than 4xx, yield will be set non-zero. */
922
923return yield;
924}
925
926
927
fcc8e047
JH
928/* Do the client side of smtp-level authentication */
929/*
930Arguments:
931 buffer EHLO response from server (gets overwritten)
932 addrlist chain of potential addresses to deliver
933 host host to deliver to
934 ob transport options
935 ibp, obp comms channel control blocks
936
937Returns:
938 OK Success, or failed (but not required): global "smtp_authenticated" set
939 DEFER Failed authentication (and was required)
940 ERROR Internal problem
941
942 FAIL_SEND Failed communications - transmit
943 FAIL - response
944*/
945
946int
947smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
948 smtp_transport_options_block *ob, BOOL is_esmtp,
949 smtp_inblock *ibp, smtp_outblock *obp)
950{
a7538db1
JH
951int require_auth;
952uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 953
a7538db1
JH
954smtp_authenticated = FALSE;
955client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
956require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
957 host->name, host->address, NULL);
fcc8e047 958
a7538db1
JH
959if (is_esmtp && !regex_AUTH) regex_AUTH =
960 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
961 FALSE, TRUE);
fcc8e047 962
a7538db1
JH
963if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
964 {
965 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
966 expand_nmax = -1; /* reset */
fcc8e047 967
a7538db1
JH
968 /* Must not do this check until after we have saved the result of the
969 regex match above. */
fcc8e047 970
a7538db1
JH
971 if (require_auth == OK ||
972 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
973 host->address, NULL) == OK)
974 {
975 auth_instance *au;
976 fail_reason = US"no common mechanisms were found";
fcc8e047 977
a7538db1 978 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 979
a7538db1
JH
980 /* Scan the configured authenticators looking for one which is configured
981 for use as a client, which is not suppressed by client_condition, and
982 whose name matches an authentication mechanism supported by the server.
983 If one is found, attempt to authenticate by calling its client function.
984 */
fcc8e047 985
a7538db1
JH
986 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
987 {
988 uschar *p = names;
989 if (!au->client ||
990 (au->client_condition != NULL &&
991 !expand_check_condition(au->client_condition, au->name,
992 US"client authenticator")))
993 {
994 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
995 au->name,
996 (au->client)? "client_condition is false" :
997 "not configured as a client");
998 continue;
999 }
fcc8e047 1000
a7538db1 1001 /* Loop to scan supported server mechanisms */
fcc8e047 1002
a7538db1
JH
1003 while (*p != 0)
1004 {
1005 int rc;
1006 int len = Ustrlen(au->public_name);
1007 while (isspace(*p)) p++;
fcc8e047 1008
a7538db1
JH
1009 if (strncmpic(au->public_name, p, len) != 0 ||
1010 (p[len] != 0 && !isspace(p[len])))
1011 {
1012 while (*p != 0 && !isspace(*p)) p++;
1013 continue;
1014 }
fcc8e047 1015
a7538db1
JH
1016 /* Found data for a listed mechanism. Call its client entry. Set
1017 a flag in the outblock so that data is overwritten after sending so
1018 that reflections don't show it. */
fcc8e047 1019
a7538db1
JH
1020 fail_reason = US"authentication attempt(s) failed";
1021 obp->authenticating = TRUE;
1022 rc = (au->info->clientcode)(au, ibp, obp,
1023 ob->command_timeout, buffer, bufsize);
1024 obp->authenticating = FALSE;
1025 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1026 au->name, rc);
fcc8e047 1027
a7538db1
JH
1028 /* A temporary authentication failure must hold up delivery to
1029 this host. After a permanent authentication failure, we carry on
1030 to try other authentication methods. If all fail hard, try to
1031 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1032
a7538db1
JH
1033 switch(rc)
1034 {
1035 case OK:
1036 smtp_authenticated = TRUE; /* stops the outer loop */
1037 client_authenticator = au->name;
1038 if (au->set_client_id != NULL)
1039 client_authenticated_id = expand_string(au->set_client_id);
1040 break;
1041
1042 /* Failure after writing a command */
1043
1044 case FAIL_SEND:
1045 return FAIL_SEND;
1046
1047 /* Failure after reading a response */
1048
1049 case FAIL:
1050 if (errno != 0 || buffer[0] != '5') return FAIL;
1051 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1052 au->name, host->name, host->address, buffer);
1053 break;
1054
1055 /* Failure by some other means. In effect, the authenticator
1056 decided it wasn't prepared to handle this case. Typically this
1057 is the result of "fail" in an expansion string. Do we need to
1058 log anything here? Feb 2006: a message is now put in the buffer
1059 if logging is required. */
1060
1061 case CANCELLED:
1062 if (*buffer != 0)
1063 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1064 "authentication H=%s [%s] %s", au->name, host->name,
1065 host->address, buffer);
1066 break;
1067
1068 /* Internal problem, message in buffer. */
1069
1070 case ERROR:
1071 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1072 return ERROR;
1073 }
fcc8e047 1074
a7538db1
JH
1075 break; /* If not authenticated, try next authenticator */
1076 } /* Loop for scanning supported server mechanisms */
1077 } /* Loop for further authenticators */
fcc8e047 1078 }
a7538db1 1079 }
fcc8e047 1080
a7538db1 1081/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1082
a7538db1
JH
1083if (require_auth == OK && !smtp_authenticated)
1084 {
1085 set_errno(addrlist, ERRNO_AUTHFAIL,
1086 string_sprintf("authentication required but %s", fail_reason), DEFER,
1087 FALSE);
1088 return DEFER;
1089 }
4d8d62b9 1090
a7538db1 1091return OK;
fcc8e047
JH
1092}
1093
1094
1095/* Construct AUTH appendix string for MAIL TO */
1096/*
1097Arguments
1098 buffer to build string
1099 addrlist chain of potential addresses to deliver
1100 ob transport options
1101
1102Globals smtp_authenticated
1103 client_authenticated_sender
1104Return True on error, otherwise buffer has (possibly empty) terminated string
1105*/
1106
1107BOOL
1108smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1109 smtp_transport_options_block *ob)
1110{
1111uschar *local_authenticated_sender = authenticated_sender;
1112
1113#ifdef notdef
1114 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1115#endif
1116
1117if (ob->authenticated_sender != NULL)
1118 {
1119 uschar *new = expand_string(ob->authenticated_sender);
1120 if (new == NULL)
1121 {
1122 if (!expand_string_forcedfail)
1123 {
1124 uschar *message = string_sprintf("failed to expand "
1125 "authenticated_sender: %s", expand_string_message);
1126 set_errno(addrlist, 0, message, DEFER, FALSE);
1127 return TRUE;
1128 }
1129 }
1130 else if (new[0] != 0) local_authenticated_sender = new;
1131 }
1132
1133/* Add the authenticated sender address if present */
1134
1135if ((smtp_authenticated || ob->authenticated_sender_force) &&
1136 local_authenticated_sender != NULL)
1137 {
1138 string_format(buffer, bufsize, " AUTH=%s",
1139 auth_xtextencode(local_authenticated_sender,
1140 Ustrlen(local_authenticated_sender)));
1141 client_authenticated_sender = string_copy(local_authenticated_sender);
1142 }
1143else
1144 *buffer= 0;
1145
1146return FALSE;
1147}
1148
1149
1150
0756eb3c
PH
1151/*************************************************
1152* Deliver address list to given host *
1153*************************************************/
1154
1155/* If continue_hostname is not null, we get here only when continuing to
1156deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1157input. TLS is never active on a passed channel; the previous process always
1158closes it down before passing the connection on.
0756eb3c
PH
1159
1160Otherwise, we have to make a connection to the remote host, and do the
1161initial protocol exchange.
1162
1163When running as an MUA wrapper, if the sender or any recipient is rejected,
1164temporarily or permanently, we force failure for all recipients.
1165
1166Arguments:
1167 addrlist chain of potential addresses to deliver; only those whose
1168 transport_return field is set to PENDING_DEFER are currently
1169 being processed; others should be skipped - they have either
1170 been delivered to an earlier host or IP address, or been
1171 failed by one of them.
1172 host host to deliver to
1173 host_af AF_INET or AF_INET6
2d280592 1174 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1175 interface interface to bind to, or NULL
1176 tblock transport instance block
1177 copy_host TRUE if host set in addr->host_used must be copied, because
1178 it is specific to this call of the transport
1179 message_defer set TRUE if yield is OK, but all addresses were deferred
1180 because of a non-recipient, non-host failure, that is, a
1181 4xx response to MAIL FROM, DATA, or ".". This is a defer
1182 that is specific to the message.
1183 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1184 a second attempt after TLS initialization fails
1185
1186Returns: OK - the connection was made and the delivery attempted;
1187 the result for each address is in its data block.
1188 DEFER - the connection could not be made, or something failed
1189 while setting up the SMTP session, or there was a
1190 non-message-specific error, such as a timeout.
1191 ERROR - a filter command is specified for this transport,
1192 and there was a problem setting it up; OR helo_data
1193 or add_headers or authenticated_sender is specified
1194 for this transport, and the string failed to expand
1195*/
1196
1197static int
1198smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1199 uschar *interface, transport_instance *tblock, BOOL copy_host,
1200 BOOL *message_defer, BOOL suppress_tls)
1201{
1202address_item *addr;
1203address_item *sync_addr;
1204address_item *first_addr = addrlist;
1205int yield = OK;
1206int address_count;
1207int save_errno;
1208int rc;
1209time_t start_delivery_time = time(NULL);
1210smtp_transport_options_block *ob =
1211 (smtp_transport_options_block *)(tblock->options_block);
1212BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1213BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1214BOOL ok = FALSE;
1215BOOL send_rset = TRUE;
1216BOOL send_quit = TRUE;
1217BOOL setting_up = TRUE;
1218BOOL completed_address = FALSE;
1219BOOL esmtp = TRUE;
1220BOOL pending_MAIL;
447d236c 1221BOOL pass_message = FALSE;
8ccd00b1 1222#ifndef DISABLE_PRDR
fd98a5c6
JH
1223BOOL prdr_offered = FALSE;
1224BOOL prdr_active;
1225#endif
6c1c3d1d
WB
1226#ifdef EXPERIMENTAL_DSN
1227BOOL dsn_all_lasthop = TRUE;
1228#endif
0756eb3c
PH
1229smtp_inblock inblock;
1230smtp_outblock outblock;
1231int max_rcpt = tblock->max_addresses;
f1513293 1232uschar *igquotstr = US"";
41c7c167 1233uschar *helo_data = NULL;
0756eb3c
PH
1234uschar *message = NULL;
1235uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1236uschar *p;
1237uschar buffer[4096];
1238uschar inbuffer[4096];
98470202 1239uschar outbuffer[4096];
0756eb3c
PH
1240
1241suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1242
1243*message_defer = FALSE;
1244smtp_command = US"initial connection";
1245if (max_rcpt == 0) max_rcpt = 999999;
1246
1247/* Set up the buffer for reading SMTP response packets. */
1248
1249inblock.buffer = inbuffer;
1250inblock.buffersize = sizeof(inbuffer);
1251inblock.ptr = inbuffer;
1252inblock.ptrend = inbuffer;
1253
1254/* Set up the buffer for holding SMTP commands while pipelining */
1255
1256outblock.buffer = outbuffer;
1257outblock.buffersize = sizeof(outbuffer);
1258outblock.ptr = outbuffer;
1259outblock.cmd_count = 0;
1260outblock.authenticating = FALSE;
1261
6c512171
PH
1262/* Reset the parameters of a TLS session. */
1263
817d9f57
JH
1264tls_out.bits = 0;
1265tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1266tls_out.ourcert = NULL;
1267tls_out.peercert = NULL;
817d9f57
JH
1268tls_out.peerdn = NULL;
1269#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1270tls_out.sni = NULL;
5b456975 1271#endif
018058b2 1272tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1273
35aba663
JH
1274/* Flip the legacy TLS-related variables over to the outbound set in case
1275they're used in the context of the transport. Don't bother resetting
1276afterward as we're in a subprocess. */
1277
1278tls_modify_variables(&tls_out);
1279
061b7ebd
PP
1280#ifndef SUPPORT_TLS
1281if (smtps)
1282 {
018058b2
JH
1283 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1284 return ERROR;
061b7ebd
PP
1285 }
1286#endif
1287
0756eb3c
PH
1288/* Make a connection to the host if this isn't a continued delivery, and handle
1289the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1290specially so they can be identified for retries. */
1291
1292if (continue_hostname == NULL)
1293 {
a7538db1 1294 /* This puts port into host->port */
0756eb3c
PH
1295 inblock.sock = outblock.sock =
1296 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
a7538db1
JH
1297 ob->keepalive, ob->dscp
1298#ifdef EXPERIMENTAL_TPDA
1299 , tblock->tpda_event_action
1300#endif
1301 );
4311097e 1302
0756eb3c
PH
1303 if (inblock.sock < 0)
1304 {
1305 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
447d236c 1306 NULL, DEFER, FALSE);
0756eb3c
PH
1307 return DEFER;
1308 }
1309
41c7c167
PH
1310 /* Expand the greeting message while waiting for the initial response. (Makes
1311 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1312 delayed till here so that $sending_interface and $sending_port are set. */
1313
1314 helo_data = expand_string(ob->helo_data);
1315
0756eb3c
PH
1316 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1317 is nevertheless a reasonably clean way of programming this kind of logic,
1318 where you want to escape on any error. */
1319
061b7ebd
PP
1320 if (!smtps)
1321 {
1322 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1323 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1324
a7538db1
JH
1325#ifdef EXPERIMENTAL_TPDA
1326 if (tpda_raise_event(tblock->tpda_event_action, US"smtp:connect", buffer)
1327 == DEFER)
1328 {
1329 uschar *message = US"deferred by smtp:connect event expansion";
1330 set_errno(addrlist, 0, message, DEFER, FALSE);
1331 yield = DEFER;
1332 goto SEND_QUIT;
1333 }
1334#endif
1335
061b7ebd
PP
1336 /* Now check if the helo_data expansion went well, and sign off cleanly if
1337 it didn't. */
41c7c167 1338
061b7ebd
PP
1339 if (helo_data == NULL)
1340 {
1341 uschar *message = string_sprintf("failed to expand helo_data: %s",
1342 expand_string_message);
1343 set_errno(addrlist, 0, message, DEFER, FALSE);
1344 yield = DEFER;
1345 goto SEND_QUIT;
1346 }
41c7c167
PH
1347 }
1348
0756eb3c
PH
1349/** Debugging without sending a message
1350addrlist->transport_return = DEFER;
1351goto SEND_QUIT;
1352**/
1353
1354 /* Errors that occur after this point follow an SMTP command, which is
1355 left in big_buffer by smtp_write_command() for use in error messages. */
1356
1357 smtp_command = big_buffer;
1358
1359 /* Tell the remote who we are...
1360
1361 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1362 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1363 greeting is of this form. The assumption was that the far end supports it
1364 properly... but experience shows that there are some that give 5xx responses,
1365 even though the banner includes "ESMTP" (there's a bloody-minded one that
1366 says "ESMTP not spoken here"). Cope with that case.
1367
1368 September 2000: Time has passed, and it seems reasonable now to always send
1369 EHLO at the start. It is also convenient to make the change while installing
1370 the TLS stuff.
1371
1372 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1373 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1374 would be no way to send out the mails, so there is now a host list
1375 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1376 PIPELINING problem as well. Maybe it can also be useful to cure other
1377 problems with broken servers.
1378
1379 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1380 Then somebody tried it with a Microsoft mailer... It seems that all other
1381 mailers use upper case for some reason (the RFC is quite clear about case
1382 independence) so, for peace of mind, I gave in. */
1383
1384 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1385 host->name, host->address, NULL) != OK;
1386
061b7ebd
PP
1387 /* Alas; be careful, since this goto is not an error-out, so conceivably
1388 we might set data between here and the target which we assume to exist
1389 and be usable. I can see this coming back to bite us. */
a7538db1 1390#ifdef SUPPORT_TLS
061b7ebd
PP
1391 if (smtps)
1392 {
1393 tls_offered = TRUE;
1394 suppress_tls = FALSE;
1395 ob->tls_tempfail_tryclear = FALSE;
1396 smtp_command = US"SSL-on-connect";
1397 goto TLS_NEGOTIATE;
1398 }
a7538db1 1399#endif
061b7ebd 1400
0756eb3c
PH
1401 if (esmtp)
1402 {
1403 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1404 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1405 goto SEND_FAILED;
1406 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1407 ob->command_timeout))
1408 {
1409 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1410 esmtp = FALSE;
1411 }
1412 }
1413 else
1414 {
1415 DEBUG(D_transport)
1416 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1417 }
1418
1419 if (!esmtp)
1420 {
1421 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1422 goto SEND_FAILED;
1423 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1424 ob->command_timeout)) goto RESPONSE_FAILED;
1425 }
1426
f1513293
PH
1427 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1428 lmtp_ignore_quota option was set. */
1429
1430 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1431 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1432 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1433
0756eb3c
PH
1434 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1435
a7538db1 1436#ifdef SUPPORT_TLS
0756eb3c
PH
1437 tls_offered = esmtp &&
1438 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1439 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1440#endif
fd98a5c6 1441
a7538db1 1442#ifndef DISABLE_PRDR
fd98a5c6
JH
1443 prdr_offered = esmtp &&
1444 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1445 PCRE_EOPT, NULL, 0) >= 0) &&
1446 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1447 host->address, NULL) == OK);
1448
1449 if (prdr_offered)
1450 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1451#endif
0756eb3c
PH
1452 }
1453
1454/* For continuing deliveries down the same channel, the socket is the standard
1455input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1456below). Set up the pointer to where subsequent commands will be left, for
1457error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1458set from the command line if they were set in the process that passed the
1459connection on. */
1460
1461else
1462 {
1463 inblock.sock = outblock.sock = fileno(stdin);
1464 smtp_command = big_buffer;
4311097e 1465 host->port = port; /* Record the port that was used */
0756eb3c
PH
1466 }
1467
1468/* If TLS is available on this connection, whether continued or not, attempt to
1469start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1470send another EHLO - the server may give a different answer in secure mode. We
1471use a separate buffer for reading the response to STARTTLS so that if it is
1472negative, the original EHLO data is available for subsequent analysis, should
1473the client not be required to use TLS. If the response is bad, copy the buffer
1474for error analysis. */
1475
1476#ifdef SUPPORT_TLS
1477if (tls_offered && !suppress_tls &&
1478 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1479 host->address, NULL) != OK)
1480 {
1481 uschar buffer2[4096];
1482 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1483 goto SEND_FAILED;
1484
1485 /* If there is an I/O error, transmission of this message is deferred. If
1486 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1487 false, we also defer. However, if there is a temporary rejection of STARTTLS
1488 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1489 STARTTLS, we carry on. This means we will try to send the message in clear,
1490 unless the host is in hosts_require_tls (tested below). */
1491
1492 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1493 ob->command_timeout))
1494 {
0756eb3c
PH
1495 if (errno != 0 || buffer2[0] == 0 ||
1496 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1497 {
1498 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1499 goto RESPONSE_FAILED;
0dda4340 1500 }
0756eb3c
PH
1501 }
1502
1503 /* STARTTLS accepted: try to negotiate a TLS session. */
1504
1505 else
061b7ebd 1506 TLS_NEGOTIATE:
0756eb3c 1507 {
a7538db1 1508 int rc = tls_client_start(inblock.sock, host, addrlist, tblock);
0756eb3c
PH
1509
1510 /* TLS negotiation failed; give an error. From outside, this function may
1511 be called again to try in clear on a new connection, if the options permit
1512 it for this host. */
1513
1514 if (rc != OK)
1515 {
1516 save_errno = ERRNO_TLSFAILURE;
1517 message = US"failure while setting up TLS session";
1518 send_quit = FALSE;
1519 goto TLS_FAILED;
1520 }
1521
1522 /* TLS session is set up */
1523
1524 for (addr = addrlist; addr != NULL; addr = addr->next)
1525 {
5ca2a9a1
PH
1526 if (addr->transport_return == PENDING_DEFER)
1527 {
817d9f57 1528 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1529 addr->ourcert = tls_out.ourcert;
1530 addr->peercert = tls_out.peercert;
817d9f57 1531 addr->peerdn = tls_out.peerdn;
018058b2 1532 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1533 }
0756eb3c
PH
1534 }
1535 }
1536 }
1537
061b7ebd
PP
1538/* if smtps, we'll have smtp_command set to something else; always safe to
1539reset it here. */
1540smtp_command = big_buffer;
1541
41c7c167
PH
1542/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1543helo_data is null, we are dealing with a connection that was passed from
1544another process, and so we won't have expanded helo_data above. We have to
1545expand it here. $sending_ip_address and $sending_port are set up right at the
1546start of the Exim process (in exim.c). */
0756eb3c 1547
817d9f57 1548if (tls_out.active >= 0)
0756eb3c 1549 {
061b7ebd 1550 char *greeting_cmd;
41c7c167
PH
1551 if (helo_data == NULL)
1552 {
1553 helo_data = expand_string(ob->helo_data);
1554 if (helo_data == NULL)
1555 {
1556 uschar *message = string_sprintf("failed to expand helo_data: %s",
1557 expand_string_message);
1558 set_errno(addrlist, 0, message, DEFER, FALSE);
1559 yield = DEFER;
1560 goto SEND_QUIT;
1561 }
1562 }
1563
0d0e4455 1564 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1565 if (smtps)
1566 {
1567 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1568 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1569 }
1570
1571 if (esmtp)
1572 greeting_cmd = "EHLO";
1573 else
1574 {
1575 greeting_cmd = "HELO";
1576 DEBUG(D_transport)
1577 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1578 }
1579
1580 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1581 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1582 goto SEND_FAILED;
1583 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1584 ob->command_timeout))
1585 goto RESPONSE_FAILED;
1586 }
1587
1588/* If the host is required to use a secure channel, ensure that we
1589have one. */
1590
7a31d643
JH
1591else if ( verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1592 host->address, NULL) == OK
1593#ifdef EXPERIMENTAL_DANE
1594 || verify_check_this_host(&(ob->hosts_require_dane), NULL, host->name,
1595 host->address, NULL) == OK
1596#endif
1597 )
0756eb3c
PH
1598 {
1599 save_errno = ERRNO_TLSREQUIRED;
1600 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1601 host->name, host->address,
1602 tls_offered? "an attempt to start TLS failed" :
1603 "the server did not offer TLS support");
1604 goto TLS_FAILED;
1605 }
1606#endif
1607
1608/* If TLS is active, we have just started it up and re-done the EHLO command,
1609so its response needs to be analyzed. If TLS is not active and this is a
1610continued session down a previously-used socket, we haven't just done EHLO, so
1611we skip this. */
1612
1613if (continue_hostname == NULL
a7538db1 1614#ifdef SUPPORT_TLS
817d9f57 1615 || tls_out.active >= 0
a7538db1 1616#endif
0756eb3c
PH
1617 )
1618 {
f1513293
PH
1619 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1620 lmtp_ignore_quota option was set. */
1621
1622 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1623 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1624 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1625
0756eb3c
PH
1626 /* If the response to EHLO specified support for the SIZE parameter, note
1627 this, provided size_addition is non-negative. */
1628
1629 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1630 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1631 PCRE_EOPT, NULL, 0) >= 0;
1632
1633 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1634 the current host, esmtp will be false, so PIPELINING can never be used. If
1635 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c
PH
1636
1637 smtp_use_pipelining = esmtp &&
c51b8e75
PH
1638 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1639 host->address, NULL) != OK &&
0756eb3c
PH
1640 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1641 PCRE_EOPT, NULL, 0) >= 0;
1642
1643 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1644 smtp_use_pipelining? "" : "not ");
1645
8ccd00b1 1646#ifndef DISABLE_PRDR
fd98a5c6
JH
1647 prdr_offered = esmtp &&
1648 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1649 PCRE_EOPT, NULL, 0) >= 0 &&
1650 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1651 host->address, NULL) == OK;
1652
1653 if (prdr_offered)
1654 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1655#endif
1656
6c1c3d1d
WB
1657#ifdef EXPERIMENTAL_DSN
1658 /* Note if the server supports DSN */
1659 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1660 PCRE_EOPT, NULL, 0) >= 0;
1661 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1662#endif
1663
0756eb3c
PH
1664 /* Note if the response to EHLO specifies support for the AUTH extension.
1665 If it has, check that this host is one we want to authenticate to, and do
1666 the business. The host name and address must be available when the
1667 authenticator's client driver is running. */
1668
fcc8e047
JH
1669 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1670 ob, esmtp, &inblock, &outblock))
0756eb3c 1671 {
fcc8e047
JH
1672 default: goto SEND_QUIT;
1673 case OK: break;
1674 case FAIL_SEND: goto SEND_FAILED;
1675 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1676 }
1677 }
1678
1679/* The setting up of the SMTP call is now complete. Any subsequent errors are
1680message-specific. */
1681
1682setting_up = FALSE;
1683
1684/* If there is a filter command specified for this transport, we can now
1685set it up. This cannot be done until the identify of the host is known. */
1686
1687if (tblock->filter_command != NULL)
1688 {
1689 BOOL rc;
1690 uschar buffer[64];
1691 sprintf(CS buffer, "%.50s transport", tblock->name);
1692 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1693 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1694 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1695
1696 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1697 yield ERROR. */
1698
1699 if (!rc)
1700 {
447d236c
PH
1701 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1702 FALSE);
0756eb3c
PH
1703 yield = ERROR;
1704 goto SEND_QUIT;
1705 }
1706 }
1707
1708
1709/* For messages that have more than the maximum number of envelope recipients,
1710we want to send several transactions down the same SMTP connection. (See
1711comments in deliver.c as to how this reconciles, heuristically, with
1712remote_max_parallel.) This optimization was added to Exim after the following
1713code was already working. The simplest way to put it in without disturbing the
1714code was to use a goto to jump back to this point when there is another
1715transaction to handle. */
1716
1717SEND_MESSAGE:
1718sync_addr = first_addr;
1719address_count = 0;
1720ok = FALSE;
1721send_rset = TRUE;
1722completed_address = FALSE;
1723
1724
1725/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1726qualification, send it, adding something to the message size to allow for
1727imprecision and things that get added en route. Exim keeps the number of lines
1728in a message, so we can give an accurate value for the original message, but we
1729need some additional to handle added headers. (Double "." characters don't get
1730included in the count.) */
1731
1732p = buffer;
1733*p = 0;
1734
1735if (smtp_use_size)
1736 {
1737 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1738 while (*p) p++;
1739 }
1740
8ccd00b1 1741#ifndef DISABLE_PRDR
fd98a5c6
JH
1742prdr_active = FALSE;
1743if (prdr_offered)
1744 {
1745 for (addr = first_addr; addr; addr = addr->next)
1746 if (addr->transport_return == PENDING_DEFER)
1747 {
1748 for (addr = addr->next; addr; addr = addr->next)
1749 if (addr->transport_return == PENDING_DEFER)
1750 { /* at least two recipients to send */
1751 prdr_active = TRUE;
1752 sprintf(CS p, " PRDR"); p += 5;
a7538db1 1753 break;
fd98a5c6
JH
1754 }
1755 break;
1756 }
1757 }
fd98a5c6
JH
1758#endif
1759
6c1c3d1d
WB
1760#ifdef EXPERIMENTAL_DSN
1761/* check if all addresses have lasthop flag */
1762/* do not send RET and ENVID if true */
1763dsn_all_lasthop = TRUE;
1764for (addr = first_addr;
1765 address_count < max_rcpt && addr != NULL;
1766 addr = addr->next)
1767 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1768 dsn_all_lasthop = FALSE;
1769
1770/* Add any DSN flags to the mail command */
1771
1772if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1773 {
1774 if (dsn_ret == dsn_ret_hdrs)
1775 {
1776 strcpy(p, " RET=HDRS");
1777 while (*p) p++;
1778 }
1779 else if (dsn_ret == dsn_ret_full)
1780 {
1781 strcpy(p, " RET=FULL");
1782 while (*p) p++;
1783 }
1784 if (dsn_envid != NULL)
1785 {
1786 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1787 while (*p) p++;
1788 }
1789 }
1790#endif
1791
6b62e899
JH
1792/* If an authenticated_sender override has been specified for this transport
1793instance, expand it. If the expansion is forced to fail, and there was already
1794an authenticated_sender for this message, the original value will be used.
1795Other expansion failures are serious. An empty result is ignored, but there is
1796otherwise no check - this feature is expected to be used with LMTP and other
1797cases where non-standard addresses (e.g. without domains) might be required. */
1798
fcc8e047 1799if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
1800 {
1801 yield = ERROR;
1802 goto SEND_QUIT;
1803 }
0756eb3c
PH
1804
1805/* From here until we send the DATA command, we can make use of PIPELINING
1806if the server host supports it. The code has to be able to check the responses
1807at any point, for when the buffer fills up, so we write it totally generally.
1808When PIPELINING is off, each command written reports that it has flushed the
1809buffer. */
1810
1811pending_MAIL = TRUE; /* The block starts with MAIL */
1812
1813rc = smtp_write_command(&outblock, smtp_use_pipelining,
1814 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1815mail_command = string_copy(big_buffer); /* Save for later error message */
1816
1817switch(rc)
1818 {
1819 case -1: /* Transmission error */
1820 goto SEND_FAILED;
1821
1822 case +1: /* Block was sent */
1823 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc
PH
1824 ob->command_timeout))
1825 {
1826 if (errno == 0 && buffer[0] == '4')
1827 {
1828 errno = ERRNO_MAIL4XX;
1829 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1830 }
1831 goto RESPONSE_FAILED;
1832 }
0756eb3c
PH
1833 pending_MAIL = FALSE;
1834 break;
1835 }
1836
1837/* Pass over all the relevant recipient addresses for this host, which are the
1838ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1839several before we have to read the responses for those seen so far. This
1840checking is done by a subroutine because it also needs to be done at the end.
1841Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1842the next one if not all are sent.
1843
1844In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1845last address because we want to abort if any recipients have any kind of
1846problem, temporary or permanent. We know that all recipient addresses will have
1847the PENDING_DEFER status, because only one attempt is ever made, and we know
1848that max_rcpt will be large, so all addresses will be done at once. */
1849
1850for (addr = first_addr;
1851 address_count < max_rcpt && addr != NULL;
1852 addr = addr->next)
1853 {
1854 int count;
1855 BOOL no_flush;
1856
a7538db1
JH
1857#ifdef EXPERIMENTAL_DSN
1858 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
1859#endif
6c1c3d1d 1860
0756eb3c
PH
1861 if (addr->transport_return != PENDING_DEFER) continue;
1862
1863 address_count++;
1864 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1865
a7538db1 1866#ifdef EXPERIMENTAL_DSN
6c1c3d1d
WB
1867 /* Add any DSN flags to the rcpt command and add to the sent string */
1868
1869 p = buffer;
1870 *p = 0;
1871
a7538db1 1872 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
1873 {
1874 if ((addr->dsn_flags & rf_dsnflags) != 0)
1875 {
1876 int i;
1877 BOOL first = TRUE;
1878 strcpy(p, " NOTIFY=");
1879 while (*p) p++;
1880 for (i = 0; i < 4; i++)
6c1c3d1d
WB
1881 if ((addr->dsn_flags & rf_list[i]) != 0)
1882 {
1883 if (!first) *p++ = ',';
1884 first = FALSE;
1885 strcpy(p, rf_names[i]);
1886 while (*p) p++;
1887 }
6c1c3d1d
WB
1888 }
1889
a7538db1
JH
1890 if (addr->dsn_orcpt != NULL)
1891 {
6c1c3d1d
WB
1892 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1893 addr->dsn_orcpt);
1894 while (*p) p++;
1895 }
1896 }
a7538db1 1897#endif
6c1c3d1d
WB
1898
1899
0756eb3c
PH
1900 /* Now send the RCPT command, and process outstanding responses when
1901 necessary. After a timeout on RCPT, we just end the function, leaving the
1902 yield as OK, because this error can often mean that there is a problem with
1903 just one address, so we don't want to delay the host. */
1904
a7538db1 1905#ifdef EXPERIMENTAL_DSN
6c1c3d1d
WB
1906 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1907 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
a7538db1 1908#else
f1513293
PH
1909 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1910 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
a7538db1 1911#endif
6c1c3d1d 1912
0756eb3c
PH
1913 if (count < 0) goto SEND_FAILED;
1914 if (count > 0)
1915 {
1916 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
1917 &sync_addr, host, count, ob->address_retry_include_sender,
1918 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1919 sizeof(buffer)))
0756eb3c
PH
1920 {
1921 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1922 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1923 break;
1924
1925 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1926 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1927 case 0: /* No 2xx or 5xx, but no probs */
1928 break;
1929
1930 case -1: goto END_OFF; /* Timeout on RCPT */
1931 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1932 }
1933 pending_MAIL = FALSE; /* Dealt with MAIL */
1934 }
1935 } /* Loop for next address */
1936
1937/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1938permanently or temporarily. We should have flushed and synced after the last
1939RCPT. */
1940
1941if (mua_wrapper)
1942 {
1943 address_item *badaddr;
1944 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1945 {
1946 if (badaddr->transport_return != PENDING_OK) break;
1947 }
1948 if (badaddr != NULL)
1949 {
447d236c
PH
1950 set_errno(addrlist, 0, badaddr->message, FAIL,
1951 testflag(badaddr, af_pass_message));
0756eb3c
PH
1952 ok = FALSE;
1953 }
1954 }
1955
1956/* If ok is TRUE, we know we have got at least one good recipient, and must now
1957send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1958have a good recipient buffered up if we are pipelining. We don't want to waste
1959time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1960are pipelining. The responses are all handled by sync_responses(). */
1961
1962if (ok || (smtp_use_pipelining && !mua_wrapper))
1963 {
1964 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1965 if (count < 0) goto SEND_FAILED;
1966 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
1967 host, count, ob->address_retry_include_sender, pending_MAIL,
1968 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
1969 {
1970 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1971 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1972 break;
1973
1974 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1975 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1976 case 0: break; /* No 2xx or 5xx, but no probs */
1977
1978 case -1: goto END_OFF; /* Timeout on RCPT */
1979 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1980 }
1981 }
1982
1983/* Save the first address of the next batch. */
1984
1985first_addr = addr;
1986
1987/* If there were no good recipients (but otherwise there have been no
1988problems), just set ok TRUE, since we have handled address-specific errors
1989already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1990for handling the SMTP dot-handling protocol, flagging to apply to headers as
1991well as body. Set the appropriate timeout value to be used for each chunk.
1992(Haven't been able to make it work using select() for writing yet.) */
1993
1994if (!ok) ok = TRUE; else
1995 {
1996 sigalrm_seen = FALSE;
1997 transport_write_timeout = ob->data_timeout;
1998 smtp_command = US"sending data block"; /* For error messages */
1999 DEBUG(D_transport|D_v)
2000 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2001 transport_count = 0;
a7538db1 2002
80a47a2c 2003#ifndef DISABLE_DKIM
4cd12fe9
TK
2004 ok = dkim_transport_write_message(addrlist, inblock.sock,
2005 topt_use_crlf | topt_end_dot | topt_escape_headers |
2006 (tblock->body_only? topt_no_headers : 0) |
2007 (tblock->headers_only? topt_no_body : 0) |
2008 (tblock->return_path_add? topt_add_return_path : 0) |
2009 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2010 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2011 0, /* No size limit */
2012 tblock->add_headers, tblock->remove_headers,
2013 US".", US"..", /* Escaping strings */
2014 tblock->rewrite_rules, tblock->rewrite_existflags,
2015 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2016 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2017 );
2018#else
0756eb3c
PH
2019 ok = transport_write_message(addrlist, inblock.sock,
2020 topt_use_crlf | topt_end_dot | topt_escape_headers |
2021 (tblock->body_only? topt_no_headers : 0) |
2022 (tblock->headers_only? topt_no_body : 0) |
2023 (tblock->return_path_add? topt_add_return_path : 0) |
2024 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2025 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2026 0, /* No size limit */
2027 tblock->add_headers, tblock->remove_headers,
2028 US".", US"..", /* Escaping strings */
2029 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2030#endif
0756eb3c
PH
2031
2032 /* transport_write_message() uses write() because it is called from other
2033 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2034 it can exit with "Broken pipe" as its error. This really means that the
2035 socket got closed at the far end. */
2036
2037 transport_write_timeout = 0; /* for subsequent transports */
2038
2039 /* Failure can either be some kind of I/O disaster (including timeout),
2040 or the failure of a transport filter or the expansion of added headers. */
2041
2042 if (!ok)
2043 {
2044 buffer[0] = 0; /* There hasn't been a response */
2045 goto RESPONSE_FAILED;
2046 }
2047
2048 /* We used to send the terminating "." explicitly here, but because of
2049 buffering effects at both ends of TCP/IP connections, you don't gain
2050 anything by keeping it separate, so it might as well go in the final
2051 data buffer for efficiency. This is now done by setting the topt_end_dot
2052 flag above. */
2053
2054 smtp_command = US"end of data";
2055
8ccd00b1 2056#ifndef DISABLE_PRDR
fd98a5c6
JH
2057 /* For PRDR we optionally get a partial-responses warning
2058 * followed by the individual responses, before going on with
2059 * the overall response. If we don't get the warning then deal
2060 * with per non-PRDR. */
2061 if(prdr_active)
2062 {
2063 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2064 ob->final_timeout);
2065 if (!ok && errno == 0)
2066 switch(buffer[0])
2067 {
2068 case '2': prdr_active = FALSE;
2069 ok = TRUE;
2070 break;
2071 case '4': errno = ERRNO_DATA4XX;
2072 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2073 break;
2074 }
2075 }
2076 else
2077#endif
2078
2079 /* For non-PRDR SMTP, we now read a single response that applies to the
2080 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2081
e97957bc
PH
2082 if (!lmtp)
2083 {
2084 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2085 ob->final_timeout);
2086 if (!ok && errno == 0 && buffer[0] == '4')
2087 {
2088 errno = ERRNO_DATA4XX;
2089 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2090 }
2091 }
0756eb3c
PH
2092
2093 /* For LMTP, we get back a response for every RCPT command that we sent;
2094 some may be accepted and some rejected. For those that get a response, their
2095 status is fixed; any that are accepted have been handed over, even if later
2096 responses crash - at least, that's how I read RFC 2033.
2097
2098 If all went well, mark the recipient addresses as completed, record which
2099 host/IPaddress they were delivered to, and cut out RSET when sending another
2100 message down the same channel. Write the completed addresses to the journal
2101 now so that they are recorded in case there is a crash of hardware or
2102 software before the spool gets updated. Also record the final SMTP
2103 confirmation if needed (for SMTP only). */
2104
2105 if (ok)
2106 {
2107 int flag = '=';
2108 int delivery_time = (int)(time(NULL) - start_delivery_time);
2109 int len;
2110 host_item *thost;
2111 uschar *conf = NULL;
2112 send_rset = FALSE;
2113
2114 /* Make a copy of the host if it is local to this invocation
2115 of the transport. */
2116
2117 if (copy_host)
2118 {
2119 thost = store_get(sizeof(host_item));
2120 *thost = *host;
2121 thost->name = string_copy(host->name);
2122 thost->address = string_copy(host->address);
2123 }
2124 else thost = host;
2125
2126 /* Set up confirmation if needed - applies only to SMTP */
2127
d68218c7 2128 if (
a7538db1 2129#ifndef EXPERIMENTAL_TPDA
d68218c7 2130 (log_extra_selector & LX_smtp_confirmation) != 0 &&
a7538db1 2131#endif
d68218c7
JH
2132 !lmtp
2133 )
0756eb3c
PH
2134 {
2135 uschar *s = string_printing(buffer);
2136 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2137 }
2138
fd98a5c6 2139 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2140 each one. */
2141
2142 for (addr = addrlist; addr != first_addr; addr = addr->next)
2143 {
2144 if (addr->transport_return != PENDING_OK) continue;
2145
2146 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2147 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2148 address. For temporary errors, add a retry item for the address so that
2149 it doesn't get tried again too soon. */
0756eb3c 2150
8ccd00b1 2151#ifndef DISABLE_PRDR
fd98a5c6
JH
2152 if (lmtp || prdr_active)
2153#else
0756eb3c 2154 if (lmtp)
fd98a5c6 2155#endif
0756eb3c
PH
2156 {
2157 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2158 ob->final_timeout))
2159 {
2160 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2161 addr->message = string_sprintf(
8ccd00b1 2162#ifndef DISABLE_PRDR
fd98a5c6
JH
2163 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2164#else
2165 "LMTP error after %s: %s",
2166#endif
0756eb3c 2167 big_buffer, string_printing(buffer));
75def545
PH
2168 setflag(addr, af_pass_message); /* Allow message to go to user */
2169 if (buffer[0] == '5')
2170 addr->transport_return = FAIL;
2171 else
2172 {
e97957bc
PH
2173 errno = ERRNO_DATA4XX;
2174 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2175 addr->transport_return = DEFER;
8ccd00b1 2176#ifndef DISABLE_PRDR
fd98a5c6
JH
2177 if (!prdr_active)
2178#endif
2179 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2180 }
0756eb3c
PH
2181 continue;
2182 }
2183 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
2184 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2185 {
2186 uschar *s = string_printing(buffer);
2187 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2188 }
0756eb3c
PH
2189 }
2190
2191 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2192 actual host that was used. */
0756eb3c
PH
2193
2194 addr->transport_return = OK;
2195 addr->more_errno = delivery_time;
0756eb3c
PH
2196 addr->host_used = thost;
2197 addr->special_action = flag;
2198 addr->message = conf;
8ccd00b1 2199#ifndef DISABLE_PRDR
fd98a5c6
JH
2200 if (prdr_active) addr->flags |= af_prdr_used;
2201#endif
0756eb3c
PH
2202 flag = '-';
2203
8ccd00b1 2204#ifndef DISABLE_PRDR
fd98a5c6
JH
2205 if (!prdr_active)
2206#endif
2207 {
2208 /* Update the journal. For homonymic addresses, use the base address plus
2209 the transport name. See lots of comments in deliver.c about the reasons
2210 for the complications when homonyms are involved. Just carry on after
2211 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2212
fd98a5c6
JH
2213 if (testflag(addr, af_homonym))
2214 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2215 else
2216 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2217
fd98a5c6
JH
2218 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2219 len = Ustrlen(CS buffer);
2220 if (write(journal_fd, buffer, len) != len)
2221 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2222 "%s: %s", buffer, strerror(errno));
2223 }
0756eb3c
PH
2224 }
2225
8ccd00b1 2226#ifndef DISABLE_PRDR
fd98a5c6
JH
2227 if (prdr_active)
2228 {
2229 /* PRDR - get the final, overall response. For any non-success
2230 upgrade all the address statuses. */
2231 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2232 ob->final_timeout);
2233 if (!ok)
2234 {
2235 if(errno == 0 && buffer[0] == '4')
2236 {
2237 errno = ERRNO_DATA4XX;
2238 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2239 }
2240 for (addr = addrlist; addr != first_addr; addr = addr->next)
2241 if (buffer[0] == '5' || addr->transport_return == OK)
2242 addr->transport_return = PENDING_OK; /* allow set_errno action */
2243 goto RESPONSE_FAILED;
2244 }
2245
2246 /* Update the journal, or setup retry. */
2247 for (addr = addrlist; addr != first_addr; addr = addr->next)
2248 if (addr->transport_return == OK)
2249 {
2250 if (testflag(addr, af_homonym))
2251 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2252 else
2253 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2254
fd98a5c6
JH
2255 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2256 len = Ustrlen(CS buffer);
2257 if (write(journal_fd, buffer, len) != len)
2258 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2259 "%s: %s", buffer, strerror(errno));
2260 }
2261 else if (addr->transport_return == DEFER)
2262 retry_add_item(addr, addr->address_retry_key, -2);
2263 }
2264#endif
2265
0756eb3c
PH
2266 /* Ensure the journal file is pushed out to disk. */
2267
54fc8428 2268 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2269 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2270 strerror(errno));
2271 }
2272 }
2273
2274
2275/* Handle general (not specific to one address) failures here. The value of ok
2276is used to skip over this code on the falling through case. A timeout causes a
2277deferral. Other errors may defer or fail according to the response code, and
2278may set up a special errno value, e.g. after connection chopped, which is
2279assumed if errno == 0 and there is no text in the buffer. If control reaches
2280here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2281the problem is not related to this specific message. */
2282
2283if (!ok)
2284 {
2285 int code;
2286
2287 RESPONSE_FAILED:
2288 save_errno = errno;
2289 message = NULL;
2290 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2291 buffer, &code, &message, &pass_message);
0756eb3c
PH
2292 goto FAILED;
2293
2294 SEND_FAILED:
2295 save_errno = errno;
2296 code = '4';
2297 message = US string_sprintf("send() to %s [%s] failed: %s",
2298 host->name, host->address, strerror(save_errno));
2299 send_quit = FALSE;
2300 goto FAILED;
2301
2302 /* This label is jumped to directly when a TLS negotiation has failed,
2303 or was not done for a host for which it is required. Values will be set
2304 in message and save_errno, and setting_up will always be true. Treat as
2305 a temporary error. */
2306
a7538db1 2307#ifdef SUPPORT_TLS
0756eb3c
PH
2308 TLS_FAILED:
2309 code = '4';
a7538db1 2310#endif
0756eb3c
PH
2311
2312 /* If the failure happened while setting up the call, see if the failure was
2313 a 5xx response (this will either be on connection, or following HELO - a 5xx
2314 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2315 never going to accept them. For other errors during setting up (timeouts or
2316 whatever), defer all addresses, and yield DEFER, so that the host is not
2317 tried again for a while. */
2318
2319 FAILED:
2320 ok = FALSE; /* For when reached by GOTO */
2321
2322 if (setting_up)
2323 {
2324 if (code == '5')
2325 {
447d236c 2326 set_errno(addrlist, save_errno, message, FAIL, pass_message);
0756eb3c
PH
2327 }
2328 else
2329 {
447d236c 2330 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2331 yield = DEFER;
2332 }
2333 }
2334
e97957bc 2335 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2336 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2337 the contents of the message rather than a real error on the connection. These
2338 cases are treated in the same way as a 4xx response. This next bit of code
2339 does the classification. */
0756eb3c 2340
e97957bc 2341 else
0756eb3c 2342 {
e97957bc 2343 BOOL message_error;
0756eb3c 2344
e97957bc
PH
2345 switch(save_errno)
2346 {
2347 case 0:
2348 case ERRNO_MAIL4XX:
2349 case ERRNO_DATA4XX:
2350 message_error = TRUE;
2351 break;
0756eb3c 2352
e97957bc
PH
2353 case ETIMEDOUT:
2354 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2355 Ustrncmp(smtp_command,"end ",4) == 0;
2356 break;
2357
2358 case ERRNO_SMTPCLOSED:
2359 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2360 break;
2361
2362 default:
2363 message_error = FALSE;
2364 break;
2365 }
0756eb3c 2366
e97957bc 2367 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2368
e97957bc
PH
2369 (a) negative response or timeout after MAIL
2370 (b) negative response after DATA
2371 (c) negative response or timeout or dropped connection after "."
0756eb3c 2372
e97957bc
PH
2373 It won't be a negative response or timeout after RCPT, as that is dealt
2374 with separately above. The action in all cases is to set an appropriate
2375 error code for all the addresses, but to leave yield set to OK because the
2376 host itself has not failed. Of course, it might in practice have failed
2377 when we've had a timeout, but if so, we'll discover that at the next
2378 delivery attempt. For a temporary error, set the message_defer flag, and
2379 write to the logs for information if this is not the last host. The error
2380 for the last host will be logged as part of the address's log line. */
2381
2382 if (message_error)
0756eb3c 2383 {
e97957bc
PH
2384 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2385 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2386 pass_message);
2387
2388 /* If there's an errno, the message contains just the identity of
2389 the host. */
2390
2391 if (code != '5') /* Anything other than 5 is treated as temporary */
2392 {
2393 if (save_errno > 0)
2394 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2395 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2396 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2397 *message_defer = TRUE;
2398 }
2399 }
2400
2401 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2402 ".", or some other transportation error. We defer all addresses and yield
2403 DEFER, except for the case of failed add_headers expansion, or a transport
2404 filter failure, when the yield should be ERROR, to stop it trying other
2405 hosts. */
2406
2407 else
2408 {
2409 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2410 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2411 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2412 }
2413 }
2414 }
2415
2416
2417/* If all has gone well, send_quit will be set TRUE, implying we can end the
2418SMTP session tidily. However, if there were too many addresses to send in one
2419message (indicated by first_addr being non-NULL) we want to carry on with the
2420rest of them. Also, it is desirable to send more than one message down the SMTP
2421connection if there are several waiting, provided we haven't already sent so
2422many as to hit the configured limit. The function transport_check_waiting looks
2423for a waiting message and returns its id. Then transport_pass_socket tries to
2424set up a continued delivery by passing the socket on to another process. The
2425variable send_rset is FALSE if a message has just been successfully transfered.
2426
2427If we are already sending down a continued channel, there may be further
2428addresses not yet delivered that are aimed at the same host, but which have not
2429been passed in this run of the transport. In this case, continue_more will be
2430true, and all we should do is send RSET if necessary, and return, leaving the
2431channel open.
2432
2433However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2434do not want to continue with other messages down the same channel, because that
2435can lead to looping between two or more messages, all with the same,
2436temporarily failing address(es). [The retry information isn't updated yet, so
2437new processes keep on trying.] We probably also don't want to try more of this
2438message's addresses either.
2439
2440If we have started a TLS session, we have to end it before passing the
2441connection to a new process. However, not all servers can handle this (Exim
2442can), so we do not pass such a connection on if the host matches
2443hosts_nopass_tls. */
2444
2445DEBUG(D_transport)
2446 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2447 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2448 continue_more, yield, (first_addr == NULL)? "":"not ");
2449
2450if (completed_address && ok && send_quit)
2451 {
2452 BOOL more;
2453 if (first_addr != NULL || continue_more ||
2454 (
817d9f57 2455 (tls_out.active < 0 ||
0756eb3c
PH
2456 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2457 host->address, NULL) != OK)
2458 &&
2459 transport_check_waiting(tblock->name, host->name,
2460 tblock->connection_max_messages, new_message_id, &more)
2461 ))
2462 {
2463 uschar *msg;
447d236c 2464 BOOL pass_message;
0756eb3c
PH
2465
2466 if (send_rset)
2467 {
2468 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2469 {
2470 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2471 host->address, strerror(save_errno));
2472 send_quit = FALSE;
2473 }
2474 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2475 ob->command_timeout)))
2476 {
2477 int code;
447d236c
PH
2478 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2479 &pass_message);
0756eb3c
PH
2480 if (!send_quit)
2481 {
2482 DEBUG(D_transport) debug_printf("%s\n", msg);
2483 }
2484 }
2485 }
2486
2487 /* Either RSET was not needed, or it succeeded */
2488
2489 if (ok)
2490 {
2491 if (first_addr != NULL) /* More addresses still to be sent */
2492 { /* in this run of the transport */
2493 continue_sequence++; /* Causes * in logging */
2494 goto SEND_MESSAGE;
2495 }
2496 if (continue_more) return yield; /* More addresses for another run */
2497
2498 /* Pass the socket to a new Exim process. Before doing so, we must shut
2499 down TLS. Not all MTAs allow for the continuation of the SMTP session
2500 when TLS is shut down. We test for this by sending a new EHLO. If we
2501 don't get a good response, we don't attempt to pass the socket on. */
2502
a7538db1 2503#ifdef SUPPORT_TLS
817d9f57 2504 if (tls_out.active >= 0)
0756eb3c 2505 {
817d9f57 2506 tls_close(FALSE, TRUE);
061b7ebd
PP
2507 if (smtps)
2508 ok = FALSE;
2509 else
2510 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2511 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2512 ob->command_timeout);
0756eb3c 2513 }
a7538db1 2514#endif
0756eb3c
PH
2515
2516 /* If the socket is successfully passed, we musn't send QUIT (or
2517 indeed anything!) from here. */
2518
2519 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2520 new_message_id, inblock.sock))
2521 {
2522 send_quit = FALSE;
2523 }
2524 }
2525
2526 /* If RSET failed and there are addresses left, they get deferred. */
2527
447d236c 2528 else set_errno(first_addr, errno, msg, DEFER, FALSE);
0756eb3c
PH
2529 }
2530 }
2531
2532/* End off tidily with QUIT unless the connection has died or the socket has
2533been passed to another process. There has been discussion on the net about what
2534to do after sending QUIT. The wording of the RFC suggests that it is necessary
2535to wait for a response, but on the other hand, there isn't anything one can do
2536with an error response, other than log it. Exim used to do that. However,
2537further discussion suggested that it is positively advantageous not to wait for
2538the response, but to close the session immediately. This is supposed to move
2539the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2540load from the server. (Hosts that are both servers and clients may not see much
2541difference, of course.) Further discussion indicated that this was safe to do
2542on Unix systems which have decent implementations of TCP/IP that leave the
2543connection around for a while (TIME_WAIT) after the application has gone away.
2544This enables the response sent by the server to be properly ACKed rather than
2545timed out, as can happen on broken TCP/IP implementations on other OS.
2546
2547This change is being made on 31-Jul-98. After over a year of trouble-free
2548operation, the old commented-out code was removed on 17-Sep-99. */
2549
2550SEND_QUIT:
2551if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2552
2553END_OFF:
2554
2555#ifdef SUPPORT_TLS
817d9f57 2556tls_close(FALSE, TRUE);
0756eb3c
PH
2557#endif
2558
2559/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2560works because the NULL setting is passed back to the calling process, and
2561remote_max_parallel is forced to 1 when delivering over an existing connection,
2562
2563If all went well and continue_more is set, we shouldn't actually get here if
2564there are further addresses, as the return above will be taken. However,
2565writing RSET might have failed, or there may be other addresses whose hosts are
2566specified in the transports, and therefore not visible at top level, in which
2567case continue_more won't get set. */
2568
f1e894f3 2569(void)close(inblock.sock);
a7538db1
JH
2570
2571#ifdef EXPERIMENTAL_TPDA
2572(void) tpda_raise_event(tblock->tpda_event_action, US"tcp:close", NULL);
2573#endif
2574
0756eb3c
PH
2575continue_transport = NULL;
2576continue_hostname = NULL;
2577return yield;
2578}
2579
2580
2581
2582
2583/*************************************************
2584* Closedown entry point *
2585*************************************************/
2586
2587/* This function is called when exim is passed an open smtp channel
2588from another incarnation, but the message which it has been asked
2589to deliver no longer exists. The channel is on stdin.
2590
2591We might do fancy things like looking for another message to send down
2592the channel, but if the one we sought has gone, it has probably been
2593delivered by some other process that itself will seek further messages,
2594so just close down our connection.
2595
2596Argument: pointer to the transport instance block
2597Returns: nothing
2598*/
2599
2600void
2601smtp_transport_closedown(transport_instance *tblock)
2602{
2603smtp_transport_options_block *ob =
2604 (smtp_transport_options_block *)(tblock->options_block);
2605smtp_inblock inblock;
2606smtp_outblock outblock;
2607uschar buffer[256];
2608uschar inbuffer[4096];
2609uschar outbuffer[16];
2610
2611inblock.sock = fileno(stdin);
2612inblock.buffer = inbuffer;
2613inblock.buffersize = sizeof(inbuffer);
2614inblock.ptr = inbuffer;
2615inblock.ptrend = inbuffer;
2616
2617outblock.sock = inblock.sock;
2618outblock.buffersize = sizeof(outbuffer);
2619outblock.buffer = outbuffer;
2620outblock.ptr = outbuffer;
2621outblock.cmd_count = 0;
2622outblock.authenticating = FALSE;
2623
2624(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2625(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2626 ob->command_timeout);
f1e894f3 2627(void)close(inblock.sock);
0756eb3c
PH
2628}
2629
2630
2631
2632/*************************************************
2633* Prepare addresses for delivery *
2634*************************************************/
2635
2636/* This function is called to flush out error settings from previous delivery
2637attempts to other hosts. It also records whether we got here via an MX record
2638or not in the more_errno field of the address. We are interested only in
2639addresses that are still marked DEFER - others may have got delivered to a
2640previously considered IP address. Set their status to PENDING_DEFER to indicate
2641which ones are relevant this time.
2642
2643Arguments:
2644 addrlist the list of addresses
2645 host the host we are delivering to
2646
2647Returns: the first address for this delivery
2648*/
2649
2650static address_item *
2651prepare_addresses(address_item *addrlist, host_item *host)
2652{
2653address_item *first_addr = NULL;
2654address_item *addr;
2655for (addr = addrlist; addr != NULL; addr = addr->next)
2656 {
2657 if (addr->transport_return != DEFER) continue;
2658 if (first_addr == NULL) first_addr = addr;
2659 addr->transport_return = PENDING_DEFER;
2660 addr->basic_errno = 0;
2661 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2662 addr->message = NULL;
a7538db1 2663#ifdef SUPPORT_TLS
0756eb3c 2664 addr->cipher = NULL;
9d1c15ef
JH
2665 addr->ourcert = NULL;
2666 addr->peercert = NULL;
0756eb3c 2667 addr->peerdn = NULL;
018058b2 2668 addr->ocsp = OCSP_NOT_REQ;
a7538db1 2669#endif
0756eb3c
PH
2670 }
2671return first_addr;
2672}
2673
2674
2675
2676/*************************************************
2677* Main entry point *
2678*************************************************/
2679
2680/* See local README for interface details. As this is a remote transport, it is
2681given a chain of addresses to be delivered in one connection, if possible. It
2682always returns TRUE, indicating that each address has its own independent
2683status set, except if there is a setting up problem, in which case it returns
2684FALSE. */
2685
2686BOOL
2687smtp_transport_entry(
2688 transport_instance *tblock, /* data for this instantiation */
2689 address_item *addrlist) /* addresses we are working on */
2690{
2691int cutoff_retry;
2692int port;
2693int hosts_defer = 0;
2694int hosts_fail = 0;
2695int hosts_looked_up = 0;
2696int hosts_retry = 0;
2697int hosts_serial = 0;
2698int hosts_total = 0;
8e669ac1 2699int total_hosts_tried = 0;
0756eb3c
PH
2700address_item *addr;
2701BOOL expired = TRUE;
2702BOOL continuing = continue_hostname != NULL;
2703uschar *expanded_hosts = NULL;
2704uschar *pistring;
2705uschar *tid = string_sprintf("%s transport", tblock->name);
2706smtp_transport_options_block *ob =
2707 (smtp_transport_options_block *)(tblock->options_block);
2708host_item *hostlist = addrlist->host_list;
2709host_item *host = NULL;
2710
2711DEBUG(D_transport)
2712 {
2713 debug_printf("%s transport entered\n", tblock->name);
2714 for (addr = addrlist; addr != NULL; addr = addr->next)
2715 debug_printf(" %s\n", addr->address);
2716 if (continuing) debug_printf("already connected to %s [%s]\n",
2717 continue_hostname, continue_host_address);
2718 }
2719
f6c332bd
PH
2720/* Set the flag requesting that these hosts be added to the waiting
2721database if the delivery fails temporarily or if we are running with
2722queue_smtp or a 2-stage queue run. This gets unset for certain
2723kinds of error, typically those that are specific to the message. */
2724
2725update_waiting = TRUE;
2726
0756eb3c
PH
2727/* If a host list is not defined for the addresses - they must all have the
2728same one in order to be passed to a single transport - or if the transport has
2729a host list with hosts_override set, use the host list supplied with the
2730transport. It is an error for this not to exist. */
2731
2732if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2733 {
2734 if (ob->hosts == NULL)
2735 {
2736 addrlist->message = string_sprintf("%s transport called with no hosts set",
2737 tblock->name);
2738 addrlist->transport_return = PANIC;
2739 return FALSE; /* Only top address has status */
2740 }
2741
2742 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2743 ob->hosts);
2744
2745 /* If the transport's host list contains no '$' characters, and we are not
2746 randomizing, it is fixed and therefore a chain of hosts can be built once
2747 and for all, and remembered for subsequent use by other calls to this
2748 transport. If, on the other hand, the host list does contain '$', or we are
2749 randomizing its order, we have to rebuild it each time. In the fixed case,
2750 as the hosts string will never be used again, it doesn't matter that we
2751 replace all the : characters with zeros. */
2752
2753 if (ob->hostlist == NULL)
2754 {
2755 uschar *s = ob->hosts;
2756
2757 if (Ustrchr(s, '$') != NULL)
2758 {
2759 expanded_hosts = expand_string(s);
2760 if (expanded_hosts == NULL)
2761 {
2762 addrlist->message = string_sprintf("failed to expand list of hosts "
2763 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2764 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2765 return FALSE; /* Only top address has status */
2766 }
2767 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2768 "\"%s\"\n", s, expanded_hosts);
2769 s = expanded_hosts;
2770 }
2771 else
2772 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2773
2774 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2775
e276e04b
TF
2776 /* Check that the expansion yielded something useful. */
2777 if (hostlist == NULL)
2778 {
2779 addrlist->message =
2780 string_sprintf("%s transport has empty hosts setting", tblock->name);
2781 addrlist->transport_return = PANIC;
2782 return FALSE; /* Only top address has status */
2783 }
2784
0756eb3c
PH
2785 /* If there was no expansion of hosts, save the host list for
2786 next time. */
2787
2788 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2789 }
2790
2791 /* This is not the first time this transport has been run in this delivery;
2792 the host list was built previously. */
2793
2794 else hostlist = ob->hostlist;
2795 }
2796
2797/* The host list was supplied with the address. If hosts_randomize is set, we
2798must sort it into a random order if it did not come from MX records and has not
2799already been randomized (but don't bother if continuing down an existing
2800connection). */
2801
2802else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2803 {
2804 host_item *newlist = NULL;
2805 while (hostlist != NULL)
2806 {
2807 host_item *h = hostlist;
2808 hostlist = hostlist->next;
2809
2810 h->sort_key = random_number(100);
2811
2812 if (newlist == NULL)
2813 {
2814 h->next = NULL;
2815 newlist = h;
2816 }
2817 else if (h->sort_key < newlist->sort_key)
2818 {
2819 h->next = newlist;
2820 newlist = h;
2821 }
2822 else
2823 {
2824 host_item *hh = newlist;
2825 while (hh->next != NULL)
2826 {
2827 if (h->sort_key < hh->next->sort_key) break;
2828 hh = hh->next;
2829 }
2830 h->next = hh->next;
2831 hh->next = h;
2832 }
2833 }
2834
2835 hostlist = addrlist->host_list = newlist;
2836 }
2837
2838
2d280592 2839/* Sort out the default port. */
0756eb3c
PH
2840
2841if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c
PH
2842
2843
2844/* For each host-plus-IP-address on the list:
2845
2846. If this is a continued delivery and the host isn't the one with the
2847 current connection, skip.
2848
2849. If the status is unusable (i.e. previously failed or retry checked), skip.
2850
2851. If no IP address set, get the address, either by turning the name into
2852 an address, calling gethostbyname if gethostbyname is on, or by calling
2853 the DNS. The DNS may yield multiple addresses, in which case insert the
2854 extra ones into the list.
2855
2856. Get the retry data if not previously obtained for this address and set the
2857 field which remembers the state of this address. Skip if the retry time is
2858 not reached. If not, remember whether retry data was found. The retry string
2859 contains both the name and the IP address.
2860
2861. Scan the list of addresses and mark those whose status is DEFER as
2862 PENDING_DEFER. These are the only ones that will be processed in this cycle
2863 of the hosts loop.
2864
2865. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2866 Some addresses may be successfully delivered, others may fail, and yet
2867 others may get temporary errors and so get marked DEFER.
2868
2869. The return from the delivery attempt is OK if a connection was made and a
2870 valid SMTP dialogue was completed. Otherwise it is DEFER.
2871
2872. If OK, add a "remove" retry item for this host/IPaddress, if any.
2873
2874. If fail to connect, or other defer state, add a retry item.
2875
2876. If there are any addresses whose status is still DEFER, carry on to the
2877 next host/IPaddress, unless we have tried the number of hosts given
533244af 2878 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
2879 there is some fancy logic for hosts_max_try that means its limit can be
2880 overstepped in some circumstances.
0756eb3c
PH
2881
2882If we get to the end of the list, all hosts have deferred at least one address,
2883or not reached their retry times. If delay_after_cutoff is unset, it requests a
2884delivery attempt to those hosts whose last try was before the arrival time of
2885the current message. To cope with this, we have to go round the loop a second
2886time. After that, set the status and error data for any addresses that haven't
2887had it set already. */
2888
2889for (cutoff_retry = 0; expired &&
2890 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2891 cutoff_retry++)
2892 {
2893 host_item *nexthost = NULL;
2894 int unexpired_hosts_tried = 0;
2895
2896 for (host = hostlist;
8e669ac1 2897 host != NULL &&
533244af
PH
2898 unexpired_hosts_tried < ob->hosts_max_try &&
2899 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
2900 host = nexthost)
2901 {
2902 int rc;
2903 int host_af;
2904 uschar *rs;
2905 BOOL serialized = FALSE;
2906 BOOL host_is_expired = FALSE;
2907 BOOL message_defer = FALSE;
2908 BOOL ifchanges = FALSE;
2909 BOOL some_deferred = FALSE;
2910 address_item *first_addr = NULL;
2911 uschar *interface = NULL;
2912 uschar *retry_host_key = NULL;
2913 uschar *retry_message_key = NULL;
2914 uschar *serialize_key = NULL;
2915
9c4e8f60
PH
2916 /* Default next host is next host. :-) But this can vary if the
2917 hosts_max_try limit is hit (see below). It may also be reset if a host
2918 address is looked up here (in case the host was multihomed). */
2919
2920 nexthost = host->next;
2921
0756eb3c
PH
2922 /* If the address hasn't yet been obtained from the host name, look it up
2923 now, unless the host is already marked as unusable. If it is marked as
2924 unusable, it means that the router was unable to find its IP address (in
2925 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2926 the lookup failed last time. We don't get this far if *all* MX records
2927 point to non-existent hosts; that is treated as a hard error.
2928
2929 We can just skip this host entirely. When the hosts came from the router,
2930 the address will timeout based on the other host(s); when the address is
2931 looked up below, there is an explicit retry record added.
2932
2933 Note that we mustn't skip unusable hosts if the address is not unset; they
2934 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2935
2936 if (host->address == NULL)
2937 {
322050c2 2938 int new_port, flags;
7cd1141b 2939 host_item *hh;
0756eb3c
PH
2940 uschar *canonical_name;
2941
2942 if (host->status >= hstatus_unusable)
2943 {
2944 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2945 host->name);
2946 continue;
2947 }
2948
2949 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2950
7cd1141b
PH
2951 /* The host name is permitted to have an attached port. Find it, and
2952 strip it from the name. Just remember it for now. */
2953
2954 new_port = host_item_get_port(host);
2955
2956 /* Count hosts looked up */
2957
0756eb3c
PH
2958 hosts_looked_up++;
2959
2960 /* Find by name if so configured, or if it's an IP address. We don't
2961 just copy the IP address, because we need the test-for-local to happen. */
2962
322050c2
PH
2963 flags = HOST_FIND_BY_A;
2964 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2965 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2966
7e66e54d 2967 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
322050c2 2968 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
0756eb3c 2969 else
0756eb3c 2970 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
578897ea 2971 ob->dnssec_request_domains, ob->dnssec_require_domains,
0756eb3c 2972 &canonical_name, NULL);
0756eb3c 2973
7cd1141b
PH
2974 /* Update the host (and any additional blocks, resulting from
2975 multihoming) with a host-specific port, if any. */
2976
2977 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2978
0756eb3c
PH
2979 /* Failure to find the host at this time (usually DNS temporary failure)
2980 is really a kind of routing failure rather than a transport failure.
2981 Therefore we add a retry item of the routing kind, not to stop us trying
2982 to look this name up here again, but to ensure the address gets timed
2983 out if the failures go on long enough. A complete failure at this point
2984 commonly points to a configuration error, but the best action is still
2985 to carry on for the next host. */
2986
2987 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2988 {
2989 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2990 expired = FALSE;
2991 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2992 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2993 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2994 host->status = hstatus_unusable;
2995
2996 for (addr = addrlist; addr != NULL; addr = addr->next)
2997 {
2998 if (addr->transport_return != DEFER) continue;
2999 addr->basic_errno = ERRNO_UNKNOWNHOST;
3000 addr->message =
3001 string_sprintf("failed to lookup IP address for %s", host->name);
3002 }
3003 continue;
3004 }
3005
3006 /* If the host is actually the local host, we may have a problem, or
3007 there may be some cunning configuration going on. In the problem case,
3008 log things and give up. The default transport status is already DEFER. */
3009
3010 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3011 {
3012 for (addr = addrlist; addr != NULL; addr = addr->next)
3013 {
3014 addr->basic_errno = 0;
3015 addr->message = string_sprintf("%s transport found host %s to be "
3016 "local", tblock->name, host->name);
3017 }
3018 goto END_TRANSPORT;
3019 }
3020 } /* End of block for IP address lookup */
3021
3022 /* If this is a continued delivery, we are interested only in the host
3023 which matches the name of the existing open channel. The check is put
3024 here after the local host lookup, in case the name gets expanded as a
3025 result of the lookup. Set expired FALSE, to save the outer loop executing
3026 twice. */
3027
3028 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3029 Ustrcmp(continue_host_address, host->address) != 0))
3030 {
3031 expired = FALSE;
3032 continue; /* With next host */
3033 }
3034
9c4e8f60
PH
3035 /* Reset the default next host in case a multihomed host whose addresses
3036 are not looked up till just above added to the host list. */
83364d30
PH
3037
3038 nexthost = host->next;
3039
0756eb3c
PH
3040 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3041 domain is in queue_smtp_domains, we don't actually want to attempt any
3042 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3043 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3044 were not in it. We don't want to hold up all SMTP deliveries! Except when
3045 doing a two-stage queue run, don't do this if forcing. */
3046
3047 if ((!deliver_force || queue_2stage) && (queue_smtp ||
cf39cf57
PH
3048 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3049 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3050 {
3051 expired = FALSE;
3052 for (addr = addrlist; addr != NULL; addr = addr->next)
3053 {
3054 if (addr->transport_return != DEFER) continue;
3055 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3056 }
3057 continue; /* With next host */
3058 }
3059
3060 /* Count hosts being considered - purely for an intelligent comment
3061 if none are usable. */
3062
3063 hosts_total++;
3064
3065 /* Set $host and $host address now in case they are needed for the
3066 interface expansion or the serialize_hosts check; they remain set if an
3067 actual delivery happens. */
3068
3069 deliver_host = host->name;
3070 deliver_host_address = host->address;
783b385f
JH
3071 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3072 : host->dnssec == DS_NO ? US"no"
3073 : US"";
0756eb3c 3074
7cd1141b
PH
3075 /* Set up a string for adding to the retry key if the port number is not
3076 the standard SMTP port. A host may have its own port setting that overrides
3077 the default. */
3078
3079 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3080 port : host->port);
3081 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3082
0756eb3c
PH
3083 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3084 string changes upon expansion, we must add it to the key that is used for
3085 retries, because connections to the same host from a different interface
3086 should be treated separately. */
3087
3088 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3089 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3090 &interface, tid))
3091 return FALSE;
3092 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3093
3094 /* The first time round the outer loop, check the status of the host by
3095 inspecting the retry data. The second time round, we are interested only
3096 in expired hosts that haven't been tried since this message arrived. */
3097
3098 if (cutoff_retry == 0)
3099 {
3100 /* Ensure the status of the address is set by checking retry data if
3101 necessary. There maybe host-specific retry data (applicable to all
3102 messages) and also data for retries of a specific message at this host.
3103 If either of these retry records are actually read, the keys used are
3104 returned to save recomputing them later. */
3105
3106 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3107 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
3108
3109 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3110 (host->address == NULL)? US"" : host->address, pistring,
3111 (host->status == hstatus_usable)? "usable" :
3112 (host->status == hstatus_unusable)? "unusable" :
3113 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3114
3115 /* Skip this address if not usable at this time, noting if it wasn't
3116 actually expired, both locally and in the address. */
3117
3118 switch (host->status)
3119 {
3120 case hstatus_unusable:
3121 expired = FALSE;
3122 setflag(addrlist, af_retry_skipped);
3123 /* Fall through */
3124
3125 case hstatus_unusable_expired:
3126 switch (host->why)
3127 {
3128 case hwhy_retry: hosts_retry++; break;
3129 case hwhy_failed: hosts_fail++; break;
3130 case hwhy_deferred: hosts_defer++; break;
3131 }
3132
3133 /* If there was a retry message key, implying that previously there
3134 was a message-specific defer, we don't want to update the list of
f6c332bd 3135 messages waiting for these hosts. */
0756eb3c 3136
f6c332bd 3137 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3138 continue; /* With the next host or IP address */
3139 }
3140 }
3141
3142 /* Second time round the loop: if the address is set but expired, and
3143 the message is newer than the last try, let it through. */
3144
3145 else
3146 {
3147 if (host->address == NULL ||
3148 host->status != hstatus_unusable_expired ||
3149 host->last_try > received_time)
3150 continue;
3151 DEBUG(D_transport)
3152 debug_printf("trying expired host %s [%s]%s\n",
3153 host->name, host->address, pistring);
3154 host_is_expired = TRUE;
3155 }
3156
3157 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3158 it remains TRUE only if all hosts are expired and none are actually tried.
3159 */
3160
3161 expired = FALSE;
3162
3163 /* If this host is listed as one to which access must be serialized,
3164 see if another Exim process has a connection to it, and if so, skip
3165 this host. If not, update the database to record our connection to it
3166 and remember this for later deletion. Do not do any of this if we are
3167 sending the message down a pre-existing connection. */
3168
3169 if (!continuing &&
3170 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3171 host->address, NULL) == OK)
3172 {
3173 serialize_key = string_sprintf("host-serialize-%s", host->name);
3174 if (!enq_start(serialize_key))
3175 {
3176 DEBUG(D_transport)
3177 debug_printf("skipping host %s because another Exim process "
3178 "is connected to it\n", host->name);
3179 hosts_serial++;
3180 continue;
3181 }
3182 serialized = TRUE;
3183 }
3184
3185 /* OK, we have an IP address that is not waiting for its retry time to
3186 arrive (it might be expired) OR (second time round the loop) we have an
3187 expired host that hasn't been tried since the message arrived. Have a go
3188 at delivering the message to it. First prepare the addresses by flushing
3189 out the result of previous attempts, and finding the first address that
3190 is still to be delivered. */
3191
3192 first_addr = prepare_addresses(addrlist, host);
3193
3194 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3195 message_id, host->name, host->address, addrlist->address,
3196 (addrlist->next == NULL)? "" : ", ...");
3197
3198 set_process_info("delivering %s to %s [%s] (%s%s)",
3199 message_id, host->name, host->address, addrlist->address,
3200 (addrlist->next == NULL)? "" : ", ...");
3201
3202 /* This is not for real; don't do the delivery. If there are
3203 any remaining hosts, list them. */
3204
3205 if (dont_deliver)
3206 {
3207 host_item *host2;
447d236c 3208 set_errno(addrlist, 0, NULL, OK, FALSE);
0756eb3c
PH
3209 for (addr = addrlist; addr != NULL; addr = addr->next)
3210 {
3211 addr->host_used = host;
3212 addr->special_action = '*';
3213 addr->message = US"delivery bypassed by -N option";
3214 }
3215 DEBUG(D_transport)
3216 {
3217 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3218 "*** host and remaining hosts:\n", tblock->name);
3219 for (host2 = host; host2 != NULL; host2 = host2->next)
3220 debug_printf(" %s [%s]\n", host2->name,
3221 (host2->address == NULL)? US"unset" : host2->address);
3222 }
3223 rc = OK;
3224 }
3225
3226 /* This is for real. If the host is expired, we don't count it for
3227 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3228 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3229 lunatic DNS configurations) is reached.
8e669ac1 3230
533244af
PH
3231 If the host is not expired and we are about to hit the hosts_max_retry
3232 limit, check to see if there is a subsequent hosts with a different MX
3233 value. If so, make that the next host, and don't count this one. This is a
3234 heuristic to make sure that different MXs do get tried. With a normal kind
3235 of retry rule, they would get tried anyway when the earlier hosts were
3236 delayed, but if the domain has a "retry every time" type of rule - as is
3237 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH
3238
3239 else
3240 {
3241 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3242 {
3243 host_item *h;
3244 DEBUG(D_transport)
3245 debug_printf("hosts_max_try limit reached with this host\n");
3246 for (h = host; h != NULL; h = h->next)
3247 if (h->mx != host->mx) break;
3248 if (h != NULL)
3249 {
3250 nexthost = h;
3251 unexpired_hosts_tried--;
3252 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3253 "and will be tried\n");
3254 }
3255 }
3256
3257 /* Attempt the delivery. */
3258
533244af 3259 total_hosts_tried++;
0756eb3c
PH
3260 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3261 expanded_hosts != NULL, &message_defer, FALSE);
3262
3263 /* Yield is one of:
3264 OK => connection made, each address contains its result;
3265 message_defer is set for message-specific defers (when all
3266 recipients are marked defer)
3267 DEFER => there was a non-message-specific delivery problem;
3268 ERROR => there was a problem setting up the arguments for a filter,
3269 or there was a problem with expanding added headers
3270 */
3271
3272 /* If the result is not OK, there was a non-message-specific problem.
3273 If the result is DEFER, we need to write to the logs saying what happened
3274 for this particular host, except in the case of authentication and TLS
3275 failures, where the log has already been written. If all hosts defer a
3276 general message is written at the end. */
3277
3278 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3279 first_addr->basic_errno != ERRNO_TLSFAILURE)
3280 write_logs(first_addr, host);
3281
a7538db1 3282#ifdef EXPERIMENTAL_TPDA
d68218c7 3283 if (rc == DEFER)
a7538db1
JH
3284 tpda_deferred(first_addr, host);
3285#endif
d68218c7 3286
0756eb3c
PH
3287 /* If STARTTLS was accepted, but there was a failure in setting up the
3288 TLS session (usually a certificate screwup), and the host is not in
3289 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3290 TLS forcibly turned off. We have to start from scratch with a new SMTP
3291 connection. That's why the retry is done from here, not from within
3292 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3293 session, so the in-clear transmission after those errors, if permitted,
3294 happens inside smtp_deliver().] */
3295
a7538db1 3296#ifdef SUPPORT_TLS
7a31d643
JH
3297 if ( rc == DEFER
3298 && first_addr->basic_errno == ERRNO_TLSFAILURE
3299 && ob->tls_tempfail_tryclear
3300 && verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3301 host->address, NULL) != OK
a1bccd48 3302# ifdef EXPERIMENTAL_DANE
7a31d643
JH
3303 && verify_check_this_host(&(ob->hosts_require_dane), NULL, host->name,
3304 host->address, NULL) != OK
a1bccd48 3305# endif
7a31d643 3306 )
0756eb3c
PH
3307 {
3308 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3309 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3310 first_addr = prepare_addresses(addrlist, host);
3311 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3312 expanded_hosts != NULL, &message_defer, TRUE);
3313 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3314 write_logs(first_addr, host);
a7538db1 3315# ifdef EXPERIMENTAL_TPDA
d68218c7 3316 if (rc == DEFER)
a7538db1
JH
3317 tpda_deferred(first_addr, host);
3318# endif
0756eb3c 3319 }
a1bccd48 3320#endif /*SUPPORT_TLS*/
0756eb3c
PH
3321 }
3322
3323 /* Delivery attempt finished */
3324
3325 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3326 US"ERROR" : US"?";
3327
3328 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3329 message_id, host->name, host->address, addrlist->address,
3330 (addrlist->next == NULL)? "" : " (& others)", rs);
3331
3332 /* Release serialization if set up */
3333
3334 if (serialized) enq_end(serialize_key);
3335
3336 /* If the result is DEFER, or if a host retry record is known to exist, we
3337 need to add an item to the retry chain for updating the retry database
3338 at the end of delivery. We only need to add the item to the top address,
3339 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3340 for any other delivery attempts using the same address. (It is copied into
3341 the unusable tree at the outer level, so even if different address blocks
3342 contain the same address, it still won't get tried again.) */
3343
3344 if (rc == DEFER || retry_host_key != NULL)
3345 {
3346 int delete_flag = (rc != DEFER)? rf_delete : 0;
3347 if (retry_host_key == NULL)
3348 {
3349 retry_host_key = ob->retry_include_ip_address?
3350 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3351 string_sprintf("T:%S%s", host->name, pistring);
3352 }
3353
3354 /* If a delivery of another message over an existing SMTP connection
3355 yields DEFER, we do NOT set up retry data for the host. This covers the
3356 case when there are delays in routing the addresses in the second message
3357 that are so long that the server times out. This is alleviated by not
3358 routing addresses that previously had routing defers when handling an
3359 existing connection, but even so, this case may occur (e.g. if a
3360 previously happily routed address starts giving routing defers). If the
3361 host is genuinely down, another non-continued message delivery will
3362 notice it soon enough. */
3363
3364 if (delete_flag != 0 || !continuing)
3365 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3366
3367 /* We may have tried an expired host, if its retry time has come; ensure
3368 the status reflects the expiry for the benefit of any other addresses. */
3369
3370 if (rc == DEFER)
3371 {
3372 host->status = (host_is_expired)?
3373 hstatus_unusable_expired : hstatus_unusable;
3374 host->why = hwhy_deferred;
3375 }
3376 }
3377
3378 /* If message_defer is set (host was OK, but every recipient got deferred
3379 because of some message-specific problem), or if that had happened
3380 previously so that a message retry key exists, add an appropriate item
3381 to the retry chain. Note that if there was a message defer but now there is
3382 a host defer, the message defer record gets deleted. That seems perfectly
3383 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3384 for specific hosts. */
0756eb3c
PH
3385
3386 if (message_defer || retry_message_key != NULL)
3387 {
3388 int delete_flag = message_defer? 0 : rf_delete;
3389 if (retry_message_key == NULL)
3390 {
3391 retry_message_key = ob->retry_include_ip_address?
3392 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3393 message_id) :
3394 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3395 }
3396 retry_add_item(addrlist, retry_message_key,
3397 rf_message | rf_host | delete_flag);
f6c332bd 3398 update_waiting = FALSE;
0756eb3c
PH
3399 }
3400
3401 /* Any return other than DEFER (that is, OK or ERROR) means that the
3402 addresses have got their final statuses filled in for this host. In the OK
3403 case, see if any of them are deferred. */
3404
3405 if (rc == OK)
3406 {
3407 for (addr = addrlist; addr != NULL; addr = addr->next)
3408 {
3409 if (addr->transport_return == DEFER)
3410 {
3411 some_deferred = TRUE;
3412 break;
3413 }
3414 }
3415 }
3416
3417 /* If no addresses deferred or the result was ERROR, return. We do this for
3418 ERROR because a failing filter set-up or add_headers expansion is likely to
3419 fail for any host we try. */
3420
3421 if (rc == ERROR || (rc == OK && !some_deferred))
3422 {
3423 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3424 return TRUE; /* Each address has its status */
3425 }
3426
3427 /* If the result was DEFER or some individual addresses deferred, let
3428 the loop run to try other hosts with the deferred addresses, except for the
3429 case when we were trying to deliver down an existing channel and failed.
3430 Don't try any other hosts in this case. */
3431
3432 if (continuing) break;
3433
3434 /* If the whole delivery, or some individual addresses, were deferred and
3435 there are more hosts that could be tried, do not count this host towards
3436 the hosts_max_try limit if the age of the message is greater than the
3437 maximum retry time for this host. This means we may try try all hosts,
3438 ignoring the limit, when messages have been around for some time. This is
3439 important because if we don't try all hosts, the address will never time
533244af 3440 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
0756eb3c
PH
3441
3442 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3443 {
3444 BOOL timedout;
3445 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3446
3447 if (retry != NULL && retry->rules != NULL)
3448 {
3449 retry_rule *last_rule;
3450 for (last_rule = retry->rules;
3451 last_rule->next != NULL;
3452 last_rule = last_rule->next);
3453 timedout = time(NULL) - received_time > last_rule->timeout;
3454 }
3455 else timedout = TRUE; /* No rule => timed out */
3456
3457 if (timedout)
3458 {
3459 unexpired_hosts_tried--;
3460 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3461 "hosts_max_try (message older than host's retry time)\n");
3462 }
3463 }
3464 } /* End of loop for trying multiple hosts. */
3465
3466 /* This is the end of the loop that repeats iff expired is TRUE and
3467 ob->delay_after_cutoff is FALSE. The second time round we will
3468 try those hosts that haven't been tried since the message arrived. */
3469
3470 DEBUG(D_transport)
3471 {
3472 debug_printf("all IP addresses skipped or deferred at least one address\n");
3473 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3474 debug_printf("retrying IP addresses not tried since message arrived\n");
3475 }
3476 }
3477
3478
3479/* Get here if all IP addresses are skipped or defer at least one address. In
3480MUA wrapper mode, this will happen only for connection or other non-message-
3481specific failures. Force the delivery status for all addresses to FAIL. */
3482
3483if (mua_wrapper)
3484 {
3485 for (addr = addrlist; addr != NULL; addr = addr->next)
3486 addr->transport_return = FAIL;
3487 goto END_TRANSPORT;
3488 }
3489
3490/* In the normal, non-wrapper case, add a standard message to each deferred
3491address if there hasn't been an error, that is, if it hasn't actually been
3492tried this time. The variable "expired" will be FALSE if any deliveries were
3493actually tried, or if there was at least one host that was not expired. That
3494is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3495a delivery has been tried, an error code will be set, and the failing of the
3496message is handled by the retry code later.
3497
3498If queue_smtp is set, or this transport was called to send a subsequent message
3499down an existing TCP/IP connection, and something caused the host not to be
3500found, we end up here, but can detect these cases and handle them specially. */
3501
3502for (addr = addrlist; addr != NULL; addr = addr->next)
3503 {
3504 /* If host is not NULL, it means that we stopped processing the host list
533244af
PH
3505 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3506 means we need to behave as if some hosts were skipped because their retry
3507 time had not come. Specifically, this prevents the address from timing out.
8e669ac1 3508 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
533244af 3509 hosts were tried. */
0756eb3c
PH
3510
3511 if (host != NULL)
3512 {
533244af
PH
3513 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3514 {
3515 DEBUG(D_transport)
3516 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3517 "hosts were tried\n");
3518 }
3519 else
8e669ac1 3520 {
533244af
PH
3521 DEBUG(D_transport)
3522 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3523 setflag(addr, af_retry_skipped);
8e669ac1 3524 }
0756eb3c
PH
3525 }
3526
3527 if (queue_smtp) /* no deliveries attempted */
3528 {
3529 addr->transport_return = DEFER;
3530 addr->basic_errno = 0;
3531 addr->message = US"SMTP delivery explicitly queued";
3532 }
3533
3534 else if (addr->transport_return == DEFER &&
3535 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3536 addr->message == NULL)
3537 {
3538 addr->basic_errno = ERRNO_HRETRY;
3539 if (continue_hostname != NULL)
3540 {
3541 addr->message = US"no host found for existing SMTP connection";
3542 }
3543 else if (expired)
3544 {
fffffe4c 3545 setflag(addr, af_pass_message); /* This is not a security risk */
0756eb3c
PH
3546 addr->message = (ob->delay_after_cutoff)?
3547 US"retry time not reached for any host after a long failure period" :
3548 US"all hosts have been failing for a long time and were last tried "
3549 "after this message arrived";
3550
3551 /* If we are already using fallback hosts, or there are no fallback hosts
3552 defined, convert the result to FAIL to cause a bounce. */
3553
3554 if (addr->host_list == addr->fallback_hosts ||
3555 addr->fallback_hosts == NULL)
3556 addr->transport_return = FAIL;
3557 }
3558 else
3559 {
3560 if (hosts_retry == hosts_total)
3561 addr->message = US"retry time not reached for any host";
3562 else if (hosts_fail == hosts_total)
3563 addr->message = US"all host address lookups failed permanently";
3564 else if (hosts_defer == hosts_total)
3565 addr->message = US"all host address lookups failed temporarily";
3566 else if (hosts_serial == hosts_total)
3567 addr->message = US"connection limit reached for all hosts";
3568 else if (hosts_fail+hosts_defer == hosts_total)
3569 addr->message = US"all host address lookups failed";
3570 else addr->message = US"some host address lookups failed and retry time "
3571 "not reached for other hosts or connection limit reached";
3572 }
3573 }
3574 }
3575
3576/* Update the database which keeps information about which messages are waiting
f6c332bd
PH
3577for which hosts to become available. For some message-specific errors, the
3578update_waiting flag is turned off because we don't want follow-on deliveries in
ea722490 3579those cases. If this transport instance is explicitly limited to one message
8b260705
PP
3580per connection then follow-on deliveries are not possible and there's no need
3581to create/update the per-transport wait-<transport_name> database. */
0756eb3c 3582
ea722490
JH
3583if (update_waiting && tblock->connection_max_messages != 1)
3584 transport_update_waiting(hostlist, tblock->name);
0756eb3c
PH
3585
3586END_TRANSPORT:
3587
3588DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3589
3590return TRUE; /* Each address has its status */
3591}
3592
578897ea
JH
3593/* vi: aw