feed need for BDAT down to write_chunk()
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
80fea873 5/* Copyright (c) University of Cambridge 1995 - 2016 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
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22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
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24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
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27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
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33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 45#ifndef DISABLE_DKIM
f7572e5a 46 { "dkim_canon", opt_stringptr,
ff5aac2b 47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
f7572e5a 48 { "dkim_domain", opt_stringptr,
ff5aac2b 49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
f7572e5a 50 { "dkim_private_key", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 52 { "dkim_selector", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 54 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 56 { "dkim_strict", opt_stringptr,
ff5aac2b 57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
80a47a2c 58#endif
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59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
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69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 83#ifdef SUPPORT_TLS
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84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 86#endif
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87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 91#ifdef SUPPORT_TLS
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92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 94#endif
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95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 99#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
102#endif
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103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 105#ifdef SUPPORT_TLS
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106# ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
109# endif
f2de3a33 110# ifndef DISABLE_OCSP
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111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
113# endif
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114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 116#endif
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117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
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119 { "hosts_try_chunking", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
7a31d643 121#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
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122 { "hosts_try_dane", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
124#endif
8ccd00b1 125#ifndef DISABLE_PRDR
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126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128#endif
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129#ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132#endif
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133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
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137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
506900af 141 { "multi_domain", opt_expand_bool | opt_public,
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142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 147 { "retry_include_ip_address", opt_expand_bool,
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148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 153#ifdef SUPPORT_SOCKS
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154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156#endif
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 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 176 { "tls_verify_certificates", opt_stringptr,
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177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 180#endif
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181};
182
183/* Size of the options list. An extern variable has to be used so that its
184address can appear in the tables drtables.c. */
185
186int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189/* Default private options block for the smtp transport. */
190
191smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
9e4f5962 201 NULL, /* DSCP */
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202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
f98442df 205 US"*", /* hosts_try_chunking */
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206#ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
7a31d643 208 NULL, /* hosts_require_dane */
96e47838 209#endif
8ccd00b1 210#ifndef DISABLE_PRDR
f98442df 211 US"*", /* hosts_try_prdr */
fd98a5c6 212#endif
f2de3a33 213#ifndef DISABLE_OCSP
0e66b3b6 214 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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215 NULL, /* hosts_require_ocsp */
216#endif
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217 NULL, /* hosts_require_tls */
218 NULL, /* hosts_avoid_tls */
6c9ed72e 219 NULL, /* hosts_verify_avoid_tls */
c51b8e75 220 NULL, /* hosts_avoid_pipelining */
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221 NULL, /* hosts_avoid_esmtp */
222 NULL, /* hosts_nopass_tls */
223 5*60, /* command_timeout */
224 5*60, /* connect_timeout; shorter system default overrides */
225 5*60, /* data timeout */
226 10*60, /* final timeout */
227 1024, /* size_addition */
228 5, /* hosts_max_try */
8e669ac1 229 50, /* hosts_max_try_hardlimit */
48c7f9e2 230 TRUE, /* address_retry_include_sender */
0756eb3c 231 FALSE, /* allow_localhost */
382afc6b 232 FALSE, /* authenticated_sender_force */
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233 FALSE, /* gethostbyname */
234 TRUE, /* dns_qualify_single */
235 FALSE, /* dns_search_parents */
0539a19d 236 { NULL, NULL }, /* dnssec_domains {request,require} */
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237 TRUE, /* delay_after_cutoff */
238 FALSE, /* hosts_override */
239 FALSE, /* hosts_randomize */
240 TRUE, /* keepalive */
f1513293 241 FALSE, /* lmtp_ignore_quota */
9c695f6d 242 NULL, /* expand_retry_include_ip_address */
0756eb3c 243 TRUE /* retry_include_ip_address */
f0989ec0 244#ifdef SUPPORT_SOCKS
7eb6c37c 245 ,NULL /* socks_proxy */
b8bf753b 246#endif
80a47a2c 247#ifdef SUPPORT_TLS
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248 ,NULL, /* tls_certificate */
249 NULL, /* tls_crl */
250 NULL, /* tls_privatekey */
251 NULL, /* tls_require_ciphers */
54c90be1 252 NULL, /* tls_sni */
0e0f3f56 253 US"system", /* tls_verify_certificates */
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254 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
255 /* tls_dh_min_bits */
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256 TRUE, /* tls_tempfail_tryclear */
257 NULL, /* tls_verify_hosts */
610ff438 258 US"*", /* tls_try_verify_hosts */
01a4a5c5 259 US"*" /* tls_verify_cert_hostnames */
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260#endif
261#ifndef DISABLE_DKIM
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262 , {NULL, /* dkim_canon */
263 NULL, /* dkim_domain */
264 NULL, /* dkim_private_key */
265 NULL, /* dkim_selector */
266 NULL, /* dkim_sign_headers */
267 NULL} /* dkim_strict */
80a47a2c 268#endif
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269};
270
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271/* some DSN flags for use later */
272
273static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
275
45500060 276static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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277
278
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279
280/* Local statics */
281
282static uschar *smtp_command; /* Points to last cmd for error messages */
283static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 284static BOOL update_waiting; /* TRUE to update the "wait" database */
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285
286
287/*************************************************
288* Setup entry point *
289*************************************************/
290
291/* This function is called when the transport is about to be used,
292but before running it in a sub-process. It is used for two things:
293
294 (1) To set the fallback host list in addresses, when delivering.
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295 (2) To pass back the interface, port, protocol, and other options, for use
296 during callout verification.
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297
298Arguments:
299 tblock pointer to the transport instance block
300 addrlist list of addresses about to be transported
301 tf if not NULL, pointer to block in which to return options
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302 uid the uid that will be set (not used)
303 gid the gid that will be set (not used)
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304 errmsg place for error message (not used)
305
306Returns: OK always (FAIL, DEFER not used)
307*/
308
309static int
310smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 311 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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312{
313smtp_transport_options_block *ob =
314 (smtp_transport_options_block *)(tblock->options_block);
315
316errmsg = errmsg; /* Keep picky compilers happy */
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317uid = uid;
318gid = gid;
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319
320/* Pass back options if required. This interface is getting very messy. */
321
322if (tf != NULL)
323 {
324 tf->interface = ob->interface;
325 tf->port = ob->port;
326 tf->protocol = ob->protocol;
327 tf->hosts = ob->hosts;
328 tf->hosts_override = ob->hosts_override;
329 tf->hosts_randomize = ob->hosts_randomize;
330 tf->gethostbyname = ob->gethostbyname;
331 tf->qualify_single = ob->dns_qualify_single;
332 tf->search_parents = ob->dns_search_parents;
26da7e20 333 tf->helo_data = ob->helo_data;
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334 }
335
336/* Set the fallback host list for all the addresses that don't have fallback
337host lists, provided that the local host wasn't present in the original host
338list. */
339
340if (!testflag(addrlist, af_local_host_removed))
341 {
342 for (; addrlist != NULL; addrlist = addrlist->next)
343 if (addrlist->fallback_hosts == NULL)
344 addrlist->fallback_hosts = ob->fallback_hostlist;
345 }
346
347return OK;
348}
349
350
351
352/*************************************************
353* Initialization entry point *
354*************************************************/
355
356/* Called for each instance, after its options have been read, to
357enable consistency checks to be done, or anything else that needs
358to be set up.
359
360Argument: pointer to the transport instance block
361Returns: nothing
362*/
363
364void
365smtp_transport_init(transport_instance *tblock)
366{
367smtp_transport_options_block *ob =
368 (smtp_transport_options_block *)(tblock->options_block);
369
370/* Retry_use_local_part defaults FALSE if unset */
371
372if (tblock->retry_use_local_part == TRUE_UNSET)
373 tblock->retry_use_local_part = FALSE;
374
375/* Set the default port according to the protocol */
376
377if (ob->port == NULL)
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378 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
379 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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380
381/* Set up the setup entry point, to be called before subprocesses for this
382transport. */
383
384tblock->setup = smtp_transport_setup;
385
386/* Complain if any of the timeouts are zero. */
387
388if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
389 ob->final_timeout <= 0)
390 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
391 "command, data, or final timeout value is zero for %s transport",
392 tblock->name);
393
394/* If hosts_override is set and there are local hosts, set the global
395flag that stops verify from showing router hosts. */
396
397if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
398
399/* If there are any fallback hosts listed, build a chain of host items
400for them, but do not do any lookups at this time. */
401
402host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
403}
404
405
406
407
408
409/*************************************************
410* Set delivery info into all active addresses *
411*************************************************/
412
413/* Only addresses whose status is >= PENDING are relevant. A lesser
414status means that an address is not currently being processed.
415
416Arguments:
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417 addrlist points to a chain of addresses
418 errno_value to put in each address's errno field
419 msg to put in each address's message field
420 rc to put in each address's transport_return field
421 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 422 host if set, mark addrs as having used this host
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423 smtp_greeting from peer
424 helo_response from peer
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425
426If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
427the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
428this particular type of timeout.
429
430Returns: nothing
431*/
432
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433static void
434set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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435 BOOL pass_message, host_item * host
436#ifdef EXPERIMENTAL_DSN_INFO
437 , const uschar * smtp_greeting, const uschar * helo_response
438#endif
439 )
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440{
441address_item *addr;
442int orvalue = 0;
443if (errno_value == ERRNO_CONNECTTIMEOUT)
444 {
445 errno_value = ETIMEDOUT;
446 orvalue = RTEF_CTOUT;
447 }
895fbaf2 448for (addr = addrlist; addr; addr = addr->next)
168dec3b 449 if (addr->transport_return >= PENDING)
447d236c 450 {
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451 addr->basic_errno = errno_value;
452 addr->more_errno |= orvalue;
453 if (msg != NULL)
454 {
455 addr->message = msg;
456 if (pass_message) setflag(addr, af_pass_message);
457 }
458 addr->transport_return = rc;
459 if (host)
895fbaf2 460 {
168dec3b 461 addr->host_used = host;
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462#ifdef EXPERIMENTAL_DSN_INFO
463 if (smtp_greeting)
464 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
465 addr->smtp_greeting = smtp_greeting;
466
467 if (helo_response)
468 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
469 addr->helo_response = helo_response;
470#endif
471 }
447d236c 472 }
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473}
474
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475static void
476set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
477 BOOL pass_message)
478{
479set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
480#ifdef EXPERIMENTAL_DSN_INFO
481 , NULL, NULL
482#endif
483 );
484}
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485
486
487/*************************************************
488* Check an SMTP response *
489*************************************************/
490
491/* This function is given an errno code and the SMTP response buffer
492to analyse, together with the host identification for generating messages. It
493sets an appropriate message and puts the first digit of the response code into
494the yield variable. If no response was actually read, a suitable digit is
495chosen.
496
497Arguments:
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498 host the current host, to get its name for messages
499 errno_value pointer to the errno value
500 more_errno from the top address for use with ERRNO_FILTER_FAIL
501 buffer the SMTP response buffer
502 yield where to put a one-digit SMTP response code
503 message where to put an errror message
504 pass_message set TRUE if message is an SMTP response
505
506Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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507*/
508
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509static BOOL
510check_response(host_item *host, int *errno_value, int more_errno,
447d236c 511 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH
512{
513uschar *pl = US"";
514
515if (smtp_use_pipelining &&
516 (Ustrcmp(smtp_command, "MAIL") == 0 ||
517 Ustrcmp(smtp_command, "RCPT") == 0 ||
518 Ustrcmp(smtp_command, "DATA") == 0))
519 pl = US"pipelined ";
520
521*yield = '4'; /* Default setting is to give a temporary error */
522
523/* Handle response timeout */
524
525if (*errno_value == ETIMEDOUT)
526 {
c562fd30
JH
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
0756eb3c
PH
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533 }
534
535/* Handle malformed SMTP response */
536
537if (*errno_value == ERRNO_SMTPFORMAT)
538 {
55414b25 539 const uschar *malfresp = string_printing(buffer);
0756eb3c 540 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
541 *message = *malfresp == 0
542 ? string_sprintf("Malformed SMTP reply (an empty line) "
543 "in response to %s%s", pl, smtp_command)
544 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
545 pl, smtp_command, malfresp);
0756eb3c
PH
546 return FALSE;
547 }
548
549/* Handle a failed filter process error; can't send QUIT as we mustn't
550end the DATA. */
551
552if (*errno_value == ERRNO_FILTER_FAIL)
553 {
35af9f61 554 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 555 more_errno,
35af9f61 556 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
557 return FALSE;
558 }
559
560/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
561end the DATA. */
562
563if (*errno_value == ERRNO_CHHEADER_FAIL)
564 {
565 *message =
566 US string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
568 return FALSE;
569 }
570
571/* Handle failure to write a complete data block */
572
573if (*errno_value == ERRNO_WRITEINCOMPLETE)
574 {
575 *message = US string_sprintf("failed to write a data block");
576 return FALSE;
577 }
578
8c5d388a 579#ifdef SUPPORT_I18N
250b6871
JH
580/* Handle lack of advertised SMTPUTF8, for international message */
581if (*errno_value == ERRNO_UTF8_FWD)
582 {
f358d5e0 583 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH
584 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
585 return TRUE;
586 }
587#endif
588
0756eb3c
PH
589/* Handle error responses from the remote mailer. */
590
591if (buffer[0] != 0)
592 {
55414b25 593 const uschar *s = string_printing(buffer);
447d236c 594 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 595 "%s", pl, smtp_command, s);
447d236c 596 *pass_message = TRUE;
0756eb3c
PH
597 *yield = buffer[0];
598 return TRUE;
599 }
600
601/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
602connection closed) case, which causes deferral. An explicit connection reset
603error has the same effect. Otherwise, put the host's identity in the message,
604leaving the errno value to be interpreted as well. In all cases, we have to
605assume the connection is now dead. */
0756eb3c 606
19b9dc85 607if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
608 {
609 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
610 *message = US string_sprintf("Remote host closed connection "
611 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
612 }
613else *message = US string_sprintf("%s [%s]", host->name, host->address);
614
615return FALSE;
616}
617
618
619
620/*************************************************
621* Write error message to logs *
622*************************************************/
623
624/* This writes to the main log and to the message log.
625
626Arguments:
627 addr the address item containing error information
628 host the current host
629
630Returns: nothing
631*/
632
633static void
634write_logs(address_item *addr, host_item *host)
635{
c562fd30
JH
636uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
637
1a47b633
JH
638if (LOGGING(outgoing_port))
639 message = string_sprintf("%s:%d", message,
640 host->port == PORT_NONE ? 25 : host->port);
c562fd30 641if (addr->message)
0756eb3c 642 {
c562fd30 643 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
644 if (addr->basic_errno > 0)
645 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
646 log_write(0, LOG_MAIN, "%s", message);
647 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
648 }
649else
650 {
37f3dc43
JH
651 const uschar * s = exim_errstr(addr->basic_errno);
652 log_write(0, LOG_MAIN, "%s %s", message, s);
653 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
654 }
655}
656
c562fd30
JH
657static void
658msglog_line(host_item * host, uschar * message)
659{
37f3dc43
JH
660deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
661 host->name, host->address, message);
c562fd30
JH
662}
663
0756eb3c
PH
664
665
0cbf2b82 666#ifndef DISABLE_EVENT
d68218c7
JH
667/*************************************************
668* Post-defer action *
669*************************************************/
670
671/* This expands an arbitrary per-transport string.
672 It might, for example, be used to write to the database log.
673
674Arguments:
d68218c7
JH
675 addr the address item containing error information
676 host the current host
677
678Returns: nothing
679*/
680
681static void
774ef2d7 682deferred_event_raise(address_item *addr, host_item *host)
d68218c7 683{
774ef2d7 684uschar * action = addr->transport->event_action;
55414b25 685const uschar * save_domain;
a7538db1
JH
686uschar * save_local;
687
d68218c7 688if (!action)
a7538db1 689 return;
d68218c7 690
a7538db1
JH
691save_domain = deliver_domain;
692save_local = deliver_localpart;
693
694/*XXX would ip & port already be set up? */
695deliver_host_address = string_copy(host->address);
774ef2d7
JH
696deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
697event_defer_errno = addr->basic_errno;
d68218c7
JH
698
699router_name = addr->router->name;
700transport_name = addr->transport->name;
a7538db1
JH
701deliver_domain = addr->domain;
702deliver_localpart = addr->local_part;
703
774ef2d7 704(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
705 addr->message
706 ? addr->basic_errno > 0
707 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
708 : string_copy(addr->message)
709 : addr->basic_errno > 0
710 ? string_copy(US strerror(addr->basic_errno))
711 : NULL);
712
713deliver_localpart = save_local;
714deliver_domain = save_domain;
d68218c7
JH
715router_name = transport_name = NULL;
716}
717#endif
718
0756eb3c
PH
719/*************************************************
720* Synchronize SMTP responses *
721*************************************************/
722
723/* This function is called from smtp_deliver() to receive SMTP responses from
724the server, and match them up with the commands to which they relate. When
725PIPELINING is not in use, this function is called after every command, and is
726therefore somewhat over-engineered, but it is simpler to use a single scheme
727that works both with and without PIPELINING instead of having two separate sets
728of code.
729
730The set of commands that are buffered up with pipelining may start with MAIL
731and may end with DATA; in between are RCPT commands that correspond to the
732addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
733etc.) are never buffered.
734
735Errors after MAIL or DATA abort the whole process leaving the response in the
736buffer. After MAIL, pending responses are flushed, and the original command is
737re-instated in big_buffer for error messages. For RCPT commands, the remote is
738permitted to reject some recipient addresses while accepting others. However
739certain errors clearly abort the whole process. Set the value in
740transport_return to PENDING_OK if the address is accepted. If there is a
741subsequent general error, it will get reset accordingly. If not, it will get
742converted to OK at the end.
743
744Arguments:
48c7f9e2
PH
745 addrlist the complete address list
746 include_affixes TRUE if affixes include in RCPT
747 sync_addr ptr to the ptr of the one to start scanning at (updated)
748 host the host we are connected to
749 count the number of responses to read
750 address_retry_
751 include_sender true if 4xx retry is to include the sender it its key
752 pending_MAIL true if the first response is for MAIL
753 pending_DATA 0 if last command sent was not DATA
754 +1 if previously had a good recipient
755 -1 if not previously had a good recipient
756 inblock incoming SMTP block
757 timeout timeout value
758 buffer buffer for reading response
759 buffsize size of buffer
0756eb3c
PH
760
761Returns: 3 if at least one address had 2xx and one had 5xx
762 2 if at least one address had 5xx but none had 2xx
763 1 if at least one host had a 2xx response, but none had 5xx
764 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
765 -1 timeout while reading RCPT response
766 -2 I/O or other non-response error for RCPT
767 -3 DATA or MAIL failed - errno and buffer set
768*/
769
770static int
771sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
772 address_item **sync_addr, host_item *host, int count,
773 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
774 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
775 int buffsize)
776{
777address_item *addr = *sync_addr;
778int yield = 0;
779
780/* Handle the response for a MAIL command. On error, reinstate the original
781command in big_buffer for error message use, and flush any further pending
782responses before returning, except after I/O errors and timeouts. */
783
784if (pending_MAIL)
785 {
786 count--;
787 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
788 {
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && buffer[0] != 0)
791 {
792 uschar flushbuffer[4096];
e97957bc
PH
793 int save_errno = 0;
794 if (buffer[0] == '4')
795 {
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
798 }
0756eb3c
PH
799 while (count-- > 0)
800 {
801 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
802 '2', timeout)
803 && (errno != 0 || flushbuffer[0] == 0))
804 break;
805 }
e97957bc 806 errno = save_errno;
0756eb3c 807 }
c562fd30
JH
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
811 {
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = host;
814 addr = addr->next;
815 }
0756eb3c
PH
816 return -3;
817 }
818 }
819
820if (pending_DATA) count--; /* Number of RCPT responses to come */
821
822/* Read and handle the required number of RCPT responses, matching each one up
823with an address by scanning for the next address whose status is PENDING_DEFER.
824*/
825
826while (count-- > 0)
827 {
828 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
829
830 /* The address was accepted */
c562fd30 831 addr->host_used = host;
0756eb3c
PH
832
833 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
834 {
835 yield |= 1;
836 addr->transport_return = PENDING_OK;
837
838 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
839 ensure that any address-specific retry record is expunged. We do this both
840 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
841
842 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
843 {
844 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
845 sender_address);
846 retry_add_item(addr, altkey, rf_delete);
0756eb3c 847 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 848 }
0756eb3c
PH
849 }
850
851 /* Timeout while reading the response */
852
853 else if (errno == ETIMEDOUT)
854 {
c562fd30
JH
855 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
856 transport_rcpt_address(addr, include_affixes));
895fbaf2 857 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 858 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 859 update_waiting = FALSE;
0756eb3c
PH
860 return -1;
861 }
862
863 /* Handle other errors in obtaining an SMTP response by returning -1. This
864 will cause all the addresses to be deferred. Restore the SMTP command in
865 big_buffer for which we are checking the response, so the error message
866 makes sense. */
867
868 else if (errno != 0 || buffer[0] == 0)
869 {
870 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
871 transport_rcpt_address(addr, include_affixes));
872 return -2;
873 }
874
875 /* Handle SMTP permanent and temporary response codes. */
876
877 else
878 {
879 addr->message =
447d236c 880 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
881 "%s", transport_rcpt_address(addr, include_affixes),
882 string_printing(buffer));
447d236c 883 setflag(addr, af_pass_message);
c562fd30 884 msglog_line(host, addr->message);
0756eb3c
PH
885
886 /* The response was 5xx */
887
888 if (buffer[0] == '5')
889 {
890 addr->transport_return = FAIL;
891 yield |= 2;
892 }
893
894 /* The response was 4xx */
895
896 else
897 {
0756eb3c
PH
898 addr->transport_return = DEFER;
899 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 900 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 901
0cbf2b82 902#ifndef DISABLE_EVENT
5ef5dd52
JB
903 event_defer_errno = addr->more_errno;
904 msg_event_raise(US"msg:rcpt:host:defer", addr);
905#endif
906
c562fd30
JH
907 /* Log temporary errors if there are more hosts to be tried.
908 If not, log this last one in the == line. */
0756eb3c 909
c562fd30
JH
910 if (host->next)
911 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 912
0cbf2b82 913#ifndef DISABLE_EVENT
5ef5dd52
JB
914 else
915 msg_event_raise(US"msg:rcpt:defer", addr);
916#endif
917
f6c332bd
PH
918 /* Do not put this message on the list of those waiting for specific
919 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 920
f6c332bd 921 update_waiting = FALSE;
0756eb3c 922
48c7f9e2
PH
923 /* Add a retry item for the address so that it doesn't get tried again
924 too soon. If address_retry_include_sender is true, add the sender address
925 to the retry key. */
0756eb3c 926
48c7f9e2
PH
927 if (address_retry_include_sender)
928 {
929 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
930 sender_address);
931 retry_add_item(addr, altkey, 0);
932 }
933 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
934 }
935 }
936 } /* Loop for next RCPT response */
937
938/* Update where to start at for the next block of responses, unless we
939have already handled all the addresses. */
940
941if (addr != NULL) *sync_addr = addr->next;
942
943/* Handle a response to DATA. If we have not had any good recipients, either
944previously or in this block, the response is ignored. */
945
946if (pending_DATA != 0 &&
947 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
948 {
949 int code;
950 uschar *msg;
447d236c 951 BOOL pass_message;
e97957bc
PH
952 if (pending_DATA > 0 || (yield & 1) != 0)
953 {
954 if (errno == 0 && buffer[0] == '4')
955 {
956 errno = ERRNO_DATA4XX;
957 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
958 }
959 return -3;
960 }
447d236c 961 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
962 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
963 "is in use and there were no good recipients\n", msg);
964 }
965
966/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
967present) received 3xx. If any RCPTs were handled and yielded anything other
968than 4xx, yield will be set non-zero. */
969
970return yield;
971}
972
973
974
fcc8e047
JH
975/* Do the client side of smtp-level authentication */
976/*
977Arguments:
978 buffer EHLO response from server (gets overwritten)
979 addrlist chain of potential addresses to deliver
980 host host to deliver to
981 ob transport options
982 ibp, obp comms channel control blocks
983
984Returns:
985 OK Success, or failed (but not required): global "smtp_authenticated" set
986 DEFER Failed authentication (and was required)
987 ERROR Internal problem
988
989 FAIL_SEND Failed communications - transmit
990 FAIL - response
991*/
992
993int
994smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
995 smtp_transport_options_block *ob, BOOL is_esmtp,
996 smtp_inblock *ibp, smtp_outblock *obp)
997{
a7538db1
JH
998int require_auth;
999uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 1000
a7538db1
JH
1001smtp_authenticated = FALSE;
1002client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1003require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1004
a7538db1
JH
1005if (is_esmtp && !regex_AUTH) regex_AUTH =
1006 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1007 FALSE, TRUE);
fcc8e047 1008
a7538db1
JH
1009if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1010 {
1011 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1012 expand_nmax = -1; /* reset */
fcc8e047 1013
a7538db1
JH
1014 /* Must not do this check until after we have saved the result of the
1015 regex match above. */
fcc8e047 1016
a7538db1 1017 if (require_auth == OK ||
5130845b 1018 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1019 {
1020 auth_instance *au;
1021 fail_reason = US"no common mechanisms were found";
fcc8e047 1022
a7538db1 1023 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1024
a7538db1
JH
1025 /* Scan the configured authenticators looking for one which is configured
1026 for use as a client, which is not suppressed by client_condition, and
1027 whose name matches an authentication mechanism supported by the server.
1028 If one is found, attempt to authenticate by calling its client function.
1029 */
fcc8e047 1030
a7538db1
JH
1031 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1032 {
1033 uschar *p = names;
1034 if (!au->client ||
1035 (au->client_condition != NULL &&
1036 !expand_check_condition(au->client_condition, au->name,
1037 US"client authenticator")))
1038 {
1039 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1040 au->name,
1041 (au->client)? "client_condition is false" :
1042 "not configured as a client");
1043 continue;
1044 }
fcc8e047 1045
a7538db1 1046 /* Loop to scan supported server mechanisms */
fcc8e047 1047
a7538db1
JH
1048 while (*p != 0)
1049 {
1050 int rc;
1051 int len = Ustrlen(au->public_name);
1052 while (isspace(*p)) p++;
fcc8e047 1053
a7538db1
JH
1054 if (strncmpic(au->public_name, p, len) != 0 ||
1055 (p[len] != 0 && !isspace(p[len])))
1056 {
1057 while (*p != 0 && !isspace(*p)) p++;
1058 continue;
1059 }
fcc8e047 1060
a7538db1
JH
1061 /* Found data for a listed mechanism. Call its client entry. Set
1062 a flag in the outblock so that data is overwritten after sending so
1063 that reflections don't show it. */
fcc8e047 1064
a7538db1
JH
1065 fail_reason = US"authentication attempt(s) failed";
1066 obp->authenticating = TRUE;
1067 rc = (au->info->clientcode)(au, ibp, obp,
1068 ob->command_timeout, buffer, bufsize);
1069 obp->authenticating = FALSE;
1070 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1071 au->name, rc);
fcc8e047 1072
a7538db1
JH
1073 /* A temporary authentication failure must hold up delivery to
1074 this host. After a permanent authentication failure, we carry on
1075 to try other authentication methods. If all fail hard, try to
1076 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1077
a7538db1
JH
1078 switch(rc)
1079 {
1080 case OK:
1081 smtp_authenticated = TRUE; /* stops the outer loop */
1082 client_authenticator = au->name;
1083 if (au->set_client_id != NULL)
1084 client_authenticated_id = expand_string(au->set_client_id);
1085 break;
1086
1087 /* Failure after writing a command */
1088
1089 case FAIL_SEND:
1090 return FAIL_SEND;
1091
1092 /* Failure after reading a response */
1093
1094 case FAIL:
1095 if (errno != 0 || buffer[0] != '5') return FAIL;
1096 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1097 au->name, host->name, host->address, buffer);
1098 break;
1099
1100 /* Failure by some other means. In effect, the authenticator
1101 decided it wasn't prepared to handle this case. Typically this
1102 is the result of "fail" in an expansion string. Do we need to
1103 log anything here? Feb 2006: a message is now put in the buffer
1104 if logging is required. */
1105
1106 case CANCELLED:
1107 if (*buffer != 0)
1108 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1109 "authentication H=%s [%s] %s", au->name, host->name,
1110 host->address, buffer);
1111 break;
1112
1113 /* Internal problem, message in buffer. */
1114
1115 case ERROR:
895fbaf2
JH
1116 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1117 DEFER, FALSE);
a7538db1
JH
1118 return ERROR;
1119 }
fcc8e047 1120
a7538db1
JH
1121 break; /* If not authenticated, try next authenticator */
1122 } /* Loop for scanning supported server mechanisms */
1123 } /* Loop for further authenticators */
fcc8e047 1124 }
a7538db1 1125 }
fcc8e047 1126
a7538db1 1127/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1128
a7538db1
JH
1129if (require_auth == OK && !smtp_authenticated)
1130 {
895fbaf2 1131 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1132 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1133 FALSE);
a7538db1
JH
1134 return DEFER;
1135 }
4d8d62b9 1136
a7538db1 1137return OK;
fcc8e047
JH
1138}
1139
1140
1141/* Construct AUTH appendix string for MAIL TO */
1142/*
1143Arguments
1144 buffer to build string
1145 addrlist chain of potential addresses to deliver
1146 ob transport options
1147
1148Globals smtp_authenticated
1149 client_authenticated_sender
1150Return True on error, otherwise buffer has (possibly empty) terminated string
1151*/
1152
1153BOOL
1154smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1155 smtp_transport_options_block *ob)
1156{
1157uschar *local_authenticated_sender = authenticated_sender;
1158
1159#ifdef notdef
1160 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1161#endif
1162
1163if (ob->authenticated_sender != NULL)
1164 {
1165 uschar *new = expand_string(ob->authenticated_sender);
1166 if (new == NULL)
1167 {
1168 if (!expand_string_forcedfail)
1169 {
1170 uschar *message = string_sprintf("failed to expand "
1171 "authenticated_sender: %s", expand_string_message);
895fbaf2 1172 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1173 return TRUE;
1174 }
1175 }
1176 else if (new[0] != 0) local_authenticated_sender = new;
1177 }
1178
1179/* Add the authenticated sender address if present */
1180
1181if ((smtp_authenticated || ob->authenticated_sender_force) &&
1182 local_authenticated_sender != NULL)
1183 {
1184 string_format(buffer, bufsize, " AUTH=%s",
1185 auth_xtextencode(local_authenticated_sender,
1186 Ustrlen(local_authenticated_sender)));
1187 client_authenticated_sender = string_copy(local_authenticated_sender);
1188 }
1189else
1190 *buffer= 0;
1191
1192return FALSE;
1193}
1194
1195
1196
0e66b3b6 1197#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1198/* Lookup TLSA record for host/port.
1199Return: OK success with dnssec; DANE mode
1200 DEFER Do not use this host now, may retry later
1201 FAIL_FORCED No TLSA record; DANE not usable
1202 FAIL Do not use this connection
1203*/
1204
0e66b3b6 1205int
4b0fe319 1206tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1207{
1208/* move this out to host.c given the similarity to dns_lookup() ? */
1209uschar buffer[300];
55414b25 1210const uschar * fullname = buffer;
0e66b3b6
JH
1211
1212/* TLSA lookup string */
1213(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1214
1215switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1216 {
0e66b3b6
JH
1217 case DNS_SUCCEED:
1218 if (!dns_is_secure(dnsa))
1219 {
1220 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1221 return DEFER;
1222 }
4b0fe319 1223 return OK;
2d5fdd53
JH
1224
1225 case DNS_AGAIN:
1226 return DEFER; /* just defer this TLS'd conn */
1227
1228 case DNS_NOMATCH:
1229 return dane_required ? FAIL : FAIL_FORCED;
1230
1231 default:
1232 case DNS_FAIL:
1233 return dane_required ? FAIL : DEFER;
0e66b3b6 1234 }
0e66b3b6
JH
1235}
1236#endif
1237
1238
a39bd74d
JB
1239
1240typedef struct smtp_compare_s
1241{
1242 uschar *current_sender_address;
1243 struct transport_instance *tblock;
1244} smtp_compare_t;
1245
1246/*
1247Create a unique string that identifies this message, it is based on
1248sender_address, helo_data and tls_certificate if enabled. */
1249
1250static uschar *
1251smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1252{
1253address_item * addr1;
1254uschar * if1 = US"";
1255uschar * helo1 = US"";
1256#ifdef SUPPORT_TLS
1257uschar * tlsc1 = US"";
1258#endif
1259uschar * save_sender_address = sender_address;
1260uschar * local_identity = NULL;
1261smtp_transport_options_block * ob =
1262 (smtp_transport_options_block *)tblock->options_block;
1263
1264sender_address = sender;
1265
1266addr1 = deliver_make_addr (sender, TRUE);
1267deliver_set_expansions(addr1);
1268
1269if (ob->interface)
1270 if1 = expand_string(ob->interface);
1271
1272if (ob->helo_data)
1273 helo1 = expand_string(ob->helo_data);
1274
1275#ifdef SUPPORT_TLS
1276if (ob->tls_certificate)
1277 tlsc1 = expand_string(ob->tls_certificate);
1278local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1279#else
1280local_identity = string_sprintf ("%s^%s", if1, helo1);
1281#endif
1282
1283deliver_set_expansions(NULL);
1284sender_address = save_sender_address;
1285
1286return local_identity;
1287}
1288
1289
1290
1291/* This routine is a callback that is called from transport_check_waiting.
1292This function will evaluate the incoming message versus the previous
1293message. If the incoming message is using a different local identity then
1294we will veto this new message. */
1295
1296static BOOL
1297smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1298{
dadff1d4
HSHR
1299uschar * message_local_identity,
1300 * current_local_identity,
1301 * new_sender_address;
1302
1303current_local_identity =
a39bd74d 1304 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1305
dadff1d4
HSHR
1306if (!(new_sender_address = deliver_get_sender_address(message_id)))
1307 return 0;
1308
1309message_local_identity =
1310 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1311
1312return Ustrcmp(current_local_identity, message_local_identity) == 0;
1313}
1314
1315
1316
9094b84b
JH
1317uschar
1318ehlo_response(uschar * buf, size_t bsize, uschar checks)
1319{
1320#ifdef SUPPORT_TLS
ff5aac2b
JH
1321if ( checks & PEER_OFFERED_TLS
1322 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1323 checks &= ~PEER_OFFERED_TLS;
9094b84b
JH
1324#endif
1325
ff5aac2b
JH
1326if ( checks & PEER_OFFERED_IGNQ
1327 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1328 PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_IGNQ;
9094b84b 1330
f98442df
JH
1331if ( checks & PEER_OFFERED_CHUNKING
1332 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_CHUNKING;
1334
9094b84b 1335#ifndef DISABLE_PRDR
ff5aac2b
JH
1336if ( checks & PEER_OFFERED_PRDR
1337 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_PRDR;
9094b84b
JH
1339#endif
1340
1341#ifdef SUPPORT_I18N
ff5aac2b
JH
1342if ( checks & PEER_OFFERED_UTF8
1343 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_UTF8;
9094b84b
JH
1345#endif
1346
ff5aac2b
JH
1347if ( checks & PEER_OFFERED_DSN
1348 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_DSN;
9094b84b 1350
ff5aac2b
JH
1351if ( checks & PEER_OFFERED_PIPE
1352 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1353 PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PIPE;
9094b84b 1355
ff5aac2b
JH
1356if ( checks & PEER_OFFERED_SIZE
1357 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~PEER_OFFERED_SIZE;
9094b84b
JH
1359
1360return checks;
1361}
1362
1363
0756eb3c
PH
1364/*************************************************
1365* Deliver address list to given host *
1366*************************************************/
1367
1368/* If continue_hostname is not null, we get here only when continuing to
1369deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1370input. TLS is never active on a passed channel; the previous process always
1371closes it down before passing the connection on.
0756eb3c
PH
1372
1373Otherwise, we have to make a connection to the remote host, and do the
1374initial protocol exchange.
1375
1376When running as an MUA wrapper, if the sender or any recipient is rejected,
1377temporarily or permanently, we force failure for all recipients.
1378
1379Arguments:
1380 addrlist chain of potential addresses to deliver; only those whose
1381 transport_return field is set to PENDING_DEFER are currently
1382 being processed; others should be skipped - they have either
1383 been delivered to an earlier host or IP address, or been
1384 failed by one of them.
1385 host host to deliver to
1386 host_af AF_INET or AF_INET6
2d280592 1387 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1388 interface interface to bind to, or NULL
1389 tblock transport instance block
0756eb3c
PH
1390 message_defer set TRUE if yield is OK, but all addresses were deferred
1391 because of a non-recipient, non-host failure, that is, a
1392 4xx response to MAIL FROM, DATA, or ".". This is a defer
1393 that is specific to the message.
1394 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1395 a second attempt after TLS initialization fails
1396
1397Returns: OK - the connection was made and the delivery attempted;
1398 the result for each address is in its data block.
1399 DEFER - the connection could not be made, or something failed
1400 while setting up the SMTP session, or there was a
1401 non-message-specific error, such as a timeout.
1402 ERROR - a filter command is specified for this transport,
1403 and there was a problem setting it up; OR helo_data
1404 or add_headers or authenticated_sender is specified
1405 for this transport, and the string failed to expand
1406*/
1407
1408static int
1409smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1410 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1411 BOOL *message_defer, BOOL suppress_tls)
1412{
1413address_item *addr;
1414address_item *sync_addr;
1415address_item *first_addr = addrlist;
1416int yield = OK;
1417int address_count;
1418int save_errno;
1419int rc;
1420time_t start_delivery_time = time(NULL);
1421smtp_transport_options_block *ob =
1422 (smtp_transport_options_block *)(tblock->options_block);
1423BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1424BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1425BOOL ok = FALSE;
1426BOOL send_rset = TRUE;
1427BOOL send_quit = TRUE;
1428BOOL setting_up = TRUE;
1429BOOL completed_address = FALSE;
1430BOOL esmtp = TRUE;
1431BOOL pending_MAIL;
447d236c 1432BOOL pass_message = FALSE;
9094b84b 1433uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
8ccd00b1 1434#ifndef DISABLE_PRDR
fd98a5c6
JH
1435BOOL prdr_active;
1436#endif
8c5d388a 1437#ifdef SUPPORT_I18N
3c8b3577 1438BOOL utf8_needed = FALSE;
7ade712c 1439#endif
6c1c3d1d 1440BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1441#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1442BOOL dane = FALSE;
0539a19d 1443BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1444dns_answer tlsa_dnsa;
1445#endif
0756eb3c
PH
1446smtp_inblock inblock;
1447smtp_outblock outblock;
1448int max_rcpt = tblock->max_addresses;
f1513293 1449uschar *igquotstr = US"";
a39bd74d 1450
895fbaf2
JH
1451#ifdef EXPERIMENTAL_DSN_INFO
1452uschar *smtp_greeting = NULL;
1453uschar *helo_response = NULL;
1454#endif
41c7c167 1455uschar *helo_data = NULL;
a39bd74d 1456
0756eb3c
PH
1457uschar *message = NULL;
1458uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1459uschar *p;
1460uschar buffer[4096];
1461uschar inbuffer[4096];
98470202 1462uschar outbuffer[4096];
0756eb3c
PH
1463
1464suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1465
1466*message_defer = FALSE;
1467smtp_command = US"initial connection";
1468if (max_rcpt == 0) max_rcpt = 999999;
1469
1470/* Set up the buffer for reading SMTP response packets. */
1471
1472inblock.buffer = inbuffer;
1473inblock.buffersize = sizeof(inbuffer);
1474inblock.ptr = inbuffer;
1475inblock.ptrend = inbuffer;
1476
1477/* Set up the buffer for holding SMTP commands while pipelining */
1478
1479outblock.buffer = outbuffer;
1480outblock.buffersize = sizeof(outbuffer);
1481outblock.ptr = outbuffer;
1482outblock.cmd_count = 0;
1483outblock.authenticating = FALSE;
1484
6c512171
PH
1485/* Reset the parameters of a TLS session. */
1486
817d9f57
JH
1487tls_out.bits = 0;
1488tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1489tls_out.ourcert = NULL;
1490tls_out.peercert = NULL;
817d9f57
JH
1491tls_out.peerdn = NULL;
1492#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1493tls_out.sni = NULL;
5b456975 1494#endif
018058b2 1495tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1496
35aba663
JH
1497/* Flip the legacy TLS-related variables over to the outbound set in case
1498they're used in the context of the transport. Don't bother resetting
1499afterward as we're in a subprocess. */
1500
1501tls_modify_variables(&tls_out);
1502
061b7ebd
PP
1503#ifndef SUPPORT_TLS
1504if (smtps)
1505 {
895fbaf2
JH
1506 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1507 DEFER, FALSE);
018058b2 1508 return ERROR;
061b7ebd
PP
1509 }
1510#endif
1511
0756eb3c
PH
1512/* Make a connection to the host if this isn't a continued delivery, and handle
1513the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1514specially so they can be identified for retries. */
1515
1516if (continue_hostname == NULL)
1517 {
a7538db1 1518 /* This puts port into host->port */
0756eb3c 1519 inblock.sock = outblock.sock =
7eb6c37c 1520 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1521
0756eb3c
PH
1522 if (inblock.sock < 0)
1523 {
895fbaf2
JH
1524 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1525 NULL, DEFER, FALSE);
0756eb3c
PH
1526 return DEFER;
1527 }
1528
0e66b3b6
JH
1529#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1530 {
0e66b3b6
JH
1531 tls_out.dane_verified = FALSE;
1532 tls_out.tlsa_usage = 0;
1533
0e66b3b6
JH
1534 if (host->dnssec == DS_YES)
1535 {
4b0fe319
JH
1536 if( dane_required
1537 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6 1538 )
2d5fdd53 1539 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
4b0fe319 1540 {
2d5fdd53
JH
1541 case OK: dane = TRUE; break;
1542 case FAIL_FORCED: break;
1543 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1544 string_sprintf("DANE error: tlsa lookup %s",
1545 rc == DEFER ? "DEFER" : "FAIL"),
1546 rc, FALSE);
1547 return rc;
4b0fe319 1548 }
0e66b3b6
JH
1549 }
1550 else if (dane_required)
1551 {
895fbaf2 1552 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1553 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1554 FAIL, FALSE);
4b0fe319 1555 return FAIL;
0e66b3b6
JH
1556 }
1557
1558 if (dane)
1559 ob->tls_tempfail_tryclear = FALSE;
1560 }
1561#endif /*DANE*/
1562
41c7c167
PH
1563 /* Expand the greeting message while waiting for the initial response. (Makes
1564 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1565 delayed till here so that $sending_interface and $sending_port are set. */
1566
1567 helo_data = expand_string(ob->helo_data);
8c5d388a 1568#ifdef SUPPORT_I18N
810d16ad
JH
1569 if (helo_data)
1570 {
1571 uschar * errstr = NULL;
1572 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1573 {
1574 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1575 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH
1576 yield = DEFER;
1577 goto SEND_QUIT;
1578 }
1579 }
1580#endif
41c7c167 1581
0756eb3c
PH
1582 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1583 is nevertheless a reasonably clean way of programming this kind of logic,
1584 where you want to escape on any error. */
1585
061b7ebd
PP
1586 if (!smtps)
1587 {
895fbaf2
JH
1588 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1589 '2', ob->command_timeout);
1590#ifdef EXPERIMENTAL_DSN_INFO
1591 smtp_greeting = string_copy(buffer);
1592#endif
1593 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1594
0cbf2b82 1595#ifndef DISABLE_EVENT
b30275b8 1596 {
805c9d53
JH
1597 uschar * s;
1598 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1599 : host->dnssec==DS_NO ? US"no" : NULL;
1600 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1601 if (s)
a7538db1 1602 {
895fbaf2 1603 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1604 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1605 DEFER, FALSE);
a7538db1
JH
1606 yield = DEFER;
1607 goto SEND_QUIT;
1608 }
b30275b8 1609 }
a7538db1
JH
1610#endif
1611
061b7ebd
PP
1612 /* Now check if the helo_data expansion went well, and sign off cleanly if
1613 it didn't. */
41c7c167 1614
061b7ebd
PP
1615 if (helo_data == NULL)
1616 {
1617 uschar *message = string_sprintf("failed to expand helo_data: %s",
1618 expand_string_message);
895fbaf2 1619 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1620 yield = DEFER;
1621 goto SEND_QUIT;
1622 }
41c7c167
PH
1623 }
1624
0756eb3c
PH
1625/** Debugging without sending a message
1626addrlist->transport_return = DEFER;
1627goto SEND_QUIT;
1628**/
1629
1630 /* Errors that occur after this point follow an SMTP command, which is
1631 left in big_buffer by smtp_write_command() for use in error messages. */
1632
1633 smtp_command = big_buffer;
1634
1635 /* Tell the remote who we are...
1636
1637 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1638 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1639 greeting is of this form. The assumption was that the far end supports it
1640 properly... but experience shows that there are some that give 5xx responses,
1641 even though the banner includes "ESMTP" (there's a bloody-minded one that
1642 says "ESMTP not spoken here"). Cope with that case.
1643
1644 September 2000: Time has passed, and it seems reasonable now to always send
1645 EHLO at the start. It is also convenient to make the change while installing
1646 the TLS stuff.
1647
1648 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1649 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1650 would be no way to send out the mails, so there is now a host list
1651 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1652 PIPELINING problem as well. Maybe it can also be useful to cure other
1653 problems with broken servers.
1654
1655 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1656 Then somebody tried it with a Microsoft mailer... It seems that all other
1657 mailers use upper case for some reason (the RFC is quite clear about case
1658 independence) so, for peace of mind, I gave in. */
1659
5130845b 1660 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1661
061b7ebd
PP
1662 /* Alas; be careful, since this goto is not an error-out, so conceivably
1663 we might set data between here and the target which we assume to exist
1664 and be usable. I can see this coming back to bite us. */
a7538db1 1665#ifdef SUPPORT_TLS
061b7ebd
PP
1666 if (smtps)
1667 {
1668 tls_offered = TRUE;
1669 suppress_tls = FALSE;
1670 ob->tls_tempfail_tryclear = FALSE;
1671 smtp_command = US"SSL-on-connect";
1672 goto TLS_NEGOTIATE;
1673 }
a7538db1 1674#endif
061b7ebd 1675
0756eb3c
PH
1676 if (esmtp)
1677 {
1678 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1679 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1680 goto SEND_FAILED;
1681 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1682 ob->command_timeout))
1683 {
895fbaf2
JH
1684 if (errno != 0 || buffer[0] == 0 || lmtp)
1685 {
1686#ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688#endif
1689 goto RESPONSE_FAILED;
1690 }
0756eb3c
PH
1691 esmtp = FALSE;
1692 }
895fbaf2
JH
1693#ifdef EXPERIMENTAL_DSN_INFO
1694 helo_response = string_copy(buffer);
1695#endif
0756eb3c
PH
1696 }
1697 else
1698 {
1699 DEBUG(D_transport)
1700 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1701 }
1702
1703 if (!esmtp)
1704 {
895fbaf2
JH
1705 BOOL good_response;
1706
0756eb3c
PH
1707 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1708 goto SEND_FAILED;
895fbaf2
JH
1709 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1710 '2', ob->command_timeout);
1711#ifdef EXPERIMENTAL_DSN_INFO
1712 helo_response = string_copy(buffer);
1713#endif
1714 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1715 }
1716
9094b84b
JH
1717 if (esmtp || lmtp)
1718 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
ff5aac2b 1719 PEER_OFFERED_TLS /* others checked later */
9094b84b 1720 );
f1513293 1721
0756eb3c
PH
1722 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1723
a7538db1 1724#ifdef SUPPORT_TLS
9094b84b 1725 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
7ade712c 1726#endif
0756eb3c
PH
1727 }
1728
1729/* For continuing deliveries down the same channel, the socket is the standard
1730input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1731below). Set up the pointer to where subsequent commands will be left, for
1732error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1733set from the command line if they were set in the process that passed the
1734connection on. */
1735
895fbaf2
JH
1736/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1737as the contine goes via transport_pass_socket() and doublefork and exec.
1738It does not wait. Unclear how we keep separate host's responses
1739separate - we could match up by host ip+port as a bodge. */
1740
0756eb3c
PH
1741else
1742 {
1743 inblock.sock = outblock.sock = fileno(stdin);
1744 smtp_command = big_buffer;
4311097e 1745 host->port = port; /* Record the port that was used */
0756eb3c
PH
1746 }
1747
1748/* If TLS is available on this connection, whether continued or not, attempt to
1749start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1750send another EHLO - the server may give a different answer in secure mode. We
1751use a separate buffer for reading the response to STARTTLS so that if it is
1752negative, the original EHLO data is available for subsequent analysis, should
1753the client not be required to use TLS. If the response is bad, copy the buffer
1754for error analysis. */
1755
1756#ifdef SUPPORT_TLS
5130845b
JH
1757if ( tls_offered
1758 && !suppress_tls
1759 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1760 {
1761 uschar buffer2[4096];
1762 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1763 goto SEND_FAILED;
1764
1765 /* If there is an I/O error, transmission of this message is deferred. If
1766 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1767 false, we also defer. However, if there is a temporary rejection of STARTTLS
1768 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1769 STARTTLS, we carry on. This means we will try to send the message in clear,
1770 unless the host is in hosts_require_tls (tested below). */
1771
1772 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1773 ob->command_timeout))
1774 {
4b0fe319
JH
1775 if ( errno != 0
1776 || buffer2[0] == 0
1777 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1778 )
0dda4340
TK
1779 {
1780 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1781 goto RESPONSE_FAILED;
0dda4340 1782 }
0756eb3c
PH
1783 }
1784
1785 /* STARTTLS accepted: try to negotiate a TLS session. */
1786
1787 else
061b7ebd 1788 TLS_NEGOTIATE:
0756eb3c 1789 {
0e66b3b6
JH
1790 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1791# ifdef EXPERIMENTAL_DANE
1792 , dane ? &tlsa_dnsa : NULL
1793# endif
1794 );
0756eb3c
PH
1795
1796 /* TLS negotiation failed; give an error. From outside, this function may
1797 be called again to try in clear on a new connection, if the options permit
1798 it for this host. */
1799
1800 if (rc != OK)
1801 {
6ebd79ec 1802# ifdef EXPERIMENTAL_DANE
4b0fe319 1803 if (rc == DEFER && dane)
6ebd79ec 1804 {
4b0fe319
JH
1805 log_write(0, LOG_MAIN,
1806 "DANE attempt failed; no TLS connection to %s [%s]",
6ebd79ec 1807 host->name, host->address);
6ebd79ec
JH
1808 }
1809# endif
1810
0756eb3c
PH
1811 save_errno = ERRNO_TLSFAILURE;
1812 message = US"failure while setting up TLS session";
1813 send_quit = FALSE;
1814 goto TLS_FAILED;
1815 }
1816
1817 /* TLS session is set up */
1818
895fbaf2 1819 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1820 if (addr->transport_return == PENDING_DEFER)
1821 {
817d9f57 1822 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1823 addr->ourcert = tls_out.ourcert;
1824 addr->peercert = tls_out.peercert;
817d9f57 1825 addr->peerdn = tls_out.peerdn;
018058b2 1826 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1827 }
0756eb3c
PH
1828 }
1829 }
1830
061b7ebd
PP
1831/* if smtps, we'll have smtp_command set to something else; always safe to
1832reset it here. */
1833smtp_command = big_buffer;
1834
41c7c167
PH
1835/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1836helo_data is null, we are dealing with a connection that was passed from
1837another process, and so we won't have expanded helo_data above. We have to
1838expand it here. $sending_ip_address and $sending_port are set up right at the
1839start of the Exim process (in exim.c). */
0756eb3c 1840
817d9f57 1841if (tls_out.active >= 0)
0756eb3c 1842 {
061b7ebd 1843 char *greeting_cmd;
895fbaf2
JH
1844 BOOL good_response;
1845
41c7c167
PH
1846 if (helo_data == NULL)
1847 {
1848 helo_data = expand_string(ob->helo_data);
1849 if (helo_data == NULL)
1850 {
1851 uschar *message = string_sprintf("failed to expand helo_data: %s",
1852 expand_string_message);
895fbaf2 1853 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH
1854 yield = DEFER;
1855 goto SEND_QUIT;
1856 }
1857 }
1858
0d0e4455 1859 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1860 if (smtps)
1861 {
895fbaf2
JH
1862 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1863 '2', ob->command_timeout);
1864#ifdef EXPERIMENTAL_DSN_INFO
1865 smtp_greeting = string_copy(buffer);
1866#endif
1867 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
1868 }
1869
1870 if (esmtp)
1871 greeting_cmd = "EHLO";
1872 else
1873 {
1874 greeting_cmd = "HELO";
1875 DEBUG(D_transport)
1876 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1877 }
1878
1879 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1880 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1881 goto SEND_FAILED;
895fbaf2
JH
1882 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1883 '2', ob->command_timeout);
1884#ifdef EXPERIMENTAL_DSN_INFO
1885 helo_response = string_copy(buffer);
1886#endif
1887 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1888 }
1889
1890/* If the host is required to use a secure channel, ensure that we
1891have one. */
1892
b4b3528b 1893else if ( smtps
0e66b3b6 1894# ifdef EXPERIMENTAL_DANE
b4b3528b 1895 || dane
0e66b3b6 1896# endif
b4b3528b 1897 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1898 )
0756eb3c
PH
1899 {
1900 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1901 message = string_sprintf("a TLS session is required, but %s",
b4b3528b
JH
1902 tls_offered ? "an attempt to start TLS failed"
1903 : "the server did not offer TLS support");
0756eb3c
PH
1904 goto TLS_FAILED;
1905 }
0e66b3b6 1906#endif /*SUPPORT_TLS*/
0756eb3c
PH
1907
1908/* If TLS is active, we have just started it up and re-done the EHLO command,
1909so its response needs to be analyzed. If TLS is not active and this is a
1910continued session down a previously-used socket, we haven't just done EHLO, so
1911we skip this. */
1912
1913if (continue_hostname == NULL
a7538db1 1914#ifdef SUPPORT_TLS
817d9f57 1915 || tls_out.active >= 0
a7538db1 1916#endif
0756eb3c
PH
1917 )
1918 {
9094b84b
JH
1919 if (esmtp || lmtp)
1920 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1921 0 /* no TLS */
1922 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
f98442df 1923 | PEER_OFFERED_CHUNKING
9094b84b
JH
1924 | PEER_OFFERED_PRDR
1925#ifdef SUPPORT_I18N
1926 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1927 /*XXX if we hand peercaps on to continued-conn processes,
1928 must not depend on this addr */
1929#endif
1930 | PEER_OFFERED_DSN
1931 | PEER_OFFERED_PIPE
1932 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1933 );
1934
f1513293
PH
1935 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1936 lmtp_ignore_quota option was set. */
1937
9094b84b 1938 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 1939
0756eb3c
PH
1940 /* If the response to EHLO specified support for the SIZE parameter, note
1941 this, provided size_addition is non-negative. */
1942
9094b84b 1943 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
0756eb3c
PH
1944
1945 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1946 the current host, esmtp will be false, so PIPELINING can never be used. If
1947 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1948
9094b84b
JH
1949 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1950 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
0756eb3c
PH
1951
1952 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
9094b84b 1953 smtp_use_pipelining ? "" : "not ");
0756eb3c 1954
f98442df
JH
1955 if ( peer_offered & PEER_OFFERED_CHUNKING
1956 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
1957 peer_offered &= ~PEER_OFFERED_CHUNKING;
1958
1959 if (peer_offered & PEER_OFFERED_CHUNKING)
1960 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
1961
8ccd00b1 1962#ifndef DISABLE_PRDR
9094b84b
JH
1963 if ( peer_offered & PEER_OFFERED_PRDR
1964 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1965 peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 1966
9094b84b 1967 if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
1968 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1969#endif
1970
6c1c3d1d 1971 /* Note if the server supports DSN */
9094b84b
JH
1972 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1973 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
6c1c3d1d 1974
0756eb3c
PH
1975 /* Note if the response to EHLO specifies support for the AUTH extension.
1976 If it has, check that this host is one we want to authenticate to, and do
1977 the business. The host name and address must be available when the
1978 authenticator's client driver is running. */
1979
fcc8e047
JH
1980 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1981 ob, esmtp, &inblock, &outblock))
0756eb3c 1982 {
fcc8e047
JH
1983 default: goto SEND_QUIT;
1984 case OK: break;
1985 case FAIL_SEND: goto SEND_FAILED;
1986 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1987 }
1988 }
1989
1990/* The setting up of the SMTP call is now complete. Any subsequent errors are
1991message-specific. */
1992
1993setting_up = FALSE;
1994
8c5d388a 1995#ifdef SUPPORT_I18N
9094b84b
JH
1996if (addrlist->prop.utf8_msg)
1997 {
1998 utf8_needed = !addrlist->prop.utf8_downcvt
1999 && !addrlist->prop.utf8_downcvt_maybe;
2000 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2001 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2002 }
2003
7ade712c 2004/* If this is an international message we need the host to speak SMTPUTF8 */
9094b84b 2005if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH
2006 {
2007 errno = ERRNO_UTF8_FWD;
2008 goto RESPONSE_FAILED;
2009 }
2010#endif
2011
0756eb3c
PH
2012/* If there is a filter command specified for this transport, we can now
2013set it up. This cannot be done until the identify of the host is known. */
2014
2015if (tblock->filter_command != NULL)
2016 {
2017 BOOL rc;
2018 uschar buffer[64];
2019 sprintf(CS buffer, "%.50s transport", tblock->name);
2020 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2021 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 2022 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2023
2024 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2025 yield ERROR. */
2026
2027 if (!rc)
2028 {
895fbaf2
JH
2029 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2030 FALSE);
0756eb3c
PH
2031 yield = ERROR;
2032 goto SEND_QUIT;
2033 }
2034 }
2035
2036
2037/* For messages that have more than the maximum number of envelope recipients,
2038we want to send several transactions down the same SMTP connection. (See
2039comments in deliver.c as to how this reconciles, heuristically, with
2040remote_max_parallel.) This optimization was added to Exim after the following
2041code was already working. The simplest way to put it in without disturbing the
2042code was to use a goto to jump back to this point when there is another
2043transaction to handle. */
2044
2045SEND_MESSAGE:
2046sync_addr = first_addr;
2047address_count = 0;
2048ok = FALSE;
2049send_rset = TRUE;
2050completed_address = FALSE;
2051
2052
2053/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2054qualification, send it, adding something to the message size to allow for
2055imprecision and things that get added en route. Exim keeps the number of lines
2056in a message, so we can give an accurate value for the original message, but we
2057need some additional to handle added headers. (Double "." characters don't get
2058included in the count.) */
2059
2060p = buffer;
2061*p = 0;
2062
2063if (smtp_use_size)
2064 {
2065 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2066 while (*p) p++;
2067 }
2068
8ccd00b1 2069#ifndef DISABLE_PRDR
fd98a5c6 2070prdr_active = FALSE;
9094b84b 2071if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
2072 for (addr = first_addr; addr; addr = addr->next)
2073 if (addr->transport_return == PENDING_DEFER)
2074 {
2075 for (addr = addr->next; addr; addr = addr->next)
2076 if (addr->transport_return == PENDING_DEFER)
2077 { /* at least two recipients to send */
2078 prdr_active = TRUE;
2079 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2080 break;
fd98a5c6
JH
2081 }
2082 break;
2083 }
fd98a5c6
JH
2084#endif
2085
8c5d388a 2086#ifdef SUPPORT_I18N
9094b84b
JH
2087if ( addrlist->prop.utf8_msg
2088 && !addrlist->prop.utf8_downcvt
2089 && peer_offered & PEER_OFFERED_UTF8
2090 )
7ade712c
JH
2091 sprintf(CS p, " SMTPUTF8"), p += 9;
2092#endif
2093
6c1c3d1d
WB
2094/* check if all addresses have lasthop flag */
2095/* do not send RET and ENVID if true */
7ade712c 2096for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB
2097 address_count < max_rcpt && addr != NULL;
2098 addr = addr->next)
2099 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2100 {
6c1c3d1d 2101 dsn_all_lasthop = FALSE;
7ade712c
JH
2102 break;
2103 }
6c1c3d1d
WB
2104
2105/* Add any DSN flags to the mail command */
2106
7ade712c 2107if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB
2108 {
2109 if (dsn_ret == dsn_ret_hdrs)
2110 {
ff5aac2b 2111 Ustrcpy(p, " RET=HDRS"); p += 9;
6c1c3d1d
WB
2112 }
2113 else if (dsn_ret == dsn_ret_full)
2114 {
ff5aac2b 2115 Ustrcpy(p, " RET=FULL"); p += 9;
6c1c3d1d
WB
2116 }
2117 if (dsn_envid != NULL)
2118 {
2119 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2120 while (*p) p++;
2121 }
2122 }
6c1c3d1d 2123
6b62e899
JH
2124/* If an authenticated_sender override has been specified for this transport
2125instance, expand it. If the expansion is forced to fail, and there was already
2126an authenticated_sender for this message, the original value will be used.
2127Other expansion failures are serious. An empty result is ignored, but there is
2128otherwise no check - this feature is expected to be used with LMTP and other
2129cases where non-standard addresses (e.g. without domains) might be required. */
2130
fcc8e047 2131if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
2132 {
2133 yield = ERROR;
2134 goto SEND_QUIT;
2135 }
0756eb3c
PH
2136
2137/* From here until we send the DATA command, we can make use of PIPELINING
2138if the server host supports it. The code has to be able to check the responses
2139at any point, for when the buffer fills up, so we write it totally generally.
2140When PIPELINING is off, each command written reports that it has flushed the
2141buffer. */
2142
2143pending_MAIL = TRUE; /* The block starts with MAIL */
2144
3c8b3577
JH
2145 {
2146 uschar * s = return_path;
8c5d388a 2147#ifdef SUPPORT_I18N
3c8b3577
JH
2148 uschar * errstr = NULL;
2149
2150 /* If we must downconvert, do the from-address here. Remember we had to
2151 for the to-addresses (done below), and also (ugly) for re-doing when building
2152 the delivery log line. */
2153
9094b84b
JH
2154 if ( addrlist->prop.utf8_msg
2155 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2156 )
3c8b3577
JH
2157 {
2158 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2159 {
895fbaf2 2160 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH
2161 yield = ERROR;
2162 goto SEND_QUIT;
2163 }
2164 setflag(addrlist, af_utf8_downcvt);
2165 }
2166#endif
2167
2168 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2169 "MAIL FROM:<%s>%s\r\n", s, buffer);
2170 }
2171
0756eb3c
PH
2172mail_command = string_copy(big_buffer); /* Save for later error message */
2173
2174switch(rc)
2175 {
2176 case -1: /* Transmission error */
7ade712c 2177 goto SEND_FAILED;
0756eb3c
PH
2178
2179 case +1: /* Block was sent */
7ade712c 2180 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2181 ob->command_timeout))
e97957bc 2182 {
7ade712c
JH
2183 if (errno == 0 && buffer[0] == '4')
2184 {
2185 errno = ERRNO_MAIL4XX;
2186 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2187 }
2188 goto RESPONSE_FAILED;
e97957bc 2189 }
7ade712c
JH
2190 pending_MAIL = FALSE;
2191 break;
0756eb3c
PH
2192 }
2193
2194/* Pass over all the relevant recipient addresses for this host, which are the
2195ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2196several before we have to read the responses for those seen so far. This
2197checking is done by a subroutine because it also needs to be done at the end.
2198Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2199the next one if not all are sent.
2200
2201In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2202last address because we want to abort if any recipients have any kind of
2203problem, temporary or permanent. We know that all recipient addresses will have
2204the PENDING_DEFER status, because only one attempt is ever made, and we know
2205that max_rcpt will be large, so all addresses will be done at once. */
2206
2207for (addr = first_addr;
ff5aac2b 2208 addr && address_count < max_rcpt;
0756eb3c
PH
2209 addr = addr->next)
2210 {
2211 int count;
2212 BOOL no_flush;
3c8b3577 2213 uschar * rcpt_addr;
0756eb3c 2214
a7538db1 2215 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2216
0756eb3c
PH
2217 if (addr->transport_return != PENDING_DEFER) continue;
2218
2219 address_count++;
ff5aac2b 2220 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
0756eb3c 2221
6c1c3d1d
WB
2222 /* Add any DSN flags to the rcpt command and add to the sent string */
2223
2224 p = buffer;
2225 *p = 0;
2226
ff5aac2b 2227 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
6c1c3d1d
WB
2228 {
2229 if ((addr->dsn_flags & rf_dsnflags) != 0)
2230 {
2231 int i;
2232 BOOL first = TRUE;
45500060 2233 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
2234 while (*p) p++;
2235 for (i = 0; i < 4; i++)
6c1c3d1d
WB
2236 if ((addr->dsn_flags & rf_list[i]) != 0)
2237 {
2238 if (!first) *p++ = ',';
2239 first = FALSE;
45500060 2240 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
2241 while (*p) p++;
2242 }
6c1c3d1d
WB
2243 }
2244
ff5aac2b 2245 if (addr->dsn_orcpt)
a7538db1 2246 {
6c1c3d1d
WB
2247 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2248 addr->dsn_orcpt);
2249 while (*p) p++;
2250 }
2251 }
6c1c3d1d 2252
0756eb3c
PH
2253 /* Now send the RCPT command, and process outstanding responses when
2254 necessary. After a timeout on RCPT, we just end the function, leaving the
2255 yield as OK, because this error can often mean that there is a problem with
2256 just one address, so we don't want to delay the host. */
2257
3c8b3577
JH
2258 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2259
8c5d388a 2260#ifdef SUPPORT_I18N
3c8b3577
JH
2261 {
2262 uschar * dummy_errstr;
2263 if ( testflag(addrlist, af_utf8_downcvt)
2264 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2265 dummy_errstr
2266 ) )
2267 {
2268 errno = ERRNO_EXPANDFAIL;
2269 goto SEND_FAILED;
2270 }
2271 }
2272#endif
2273
6c1c3d1d 2274 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2275 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2276
0756eb3c
PH
2277 if (count < 0) goto SEND_FAILED;
2278 if (count > 0)
2279 {
2280 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2281 &sync_addr, host, count, ob->address_retry_include_sender,
2282 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2283 sizeof(buffer)))
0756eb3c
PH
2284 {
2285 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2286 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2287 break;
2288
2289 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2290 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2291 case 0: /* No 2xx or 5xx, but no probs */
2292 break;
2293
2294 case -1: goto END_OFF; /* Timeout on RCPT */
2295 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2296 }
2297 pending_MAIL = FALSE; /* Dealt with MAIL */
2298 }
2299 } /* Loop for next address */
2300
2301/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2302permanently or temporarily. We should have flushed and synced after the last
2303RCPT. */
2304
2305if (mua_wrapper)
2306 {
2307 address_item *badaddr;
168dec3b
JH
2308 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2309 if (badaddr->transport_return != PENDING_OK)
2310 {
2311 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH
2312 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2313 testflag(badaddr, af_pass_message));
168dec3b
JH
2314 ok = FALSE;
2315 break;
2316 }
0756eb3c
PH
2317 }
2318
2319/* If ok is TRUE, we know we have got at least one good recipient, and must now
2320send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2321have a good recipient buffered up if we are pipelining. We don't want to waste
2322time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2323are pipelining. The responses are all handled by sync_responses(). */
2324
2325if (ok || (smtp_use_pipelining && !mua_wrapper))
2326 {
2327 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2328 if (count < 0) goto SEND_FAILED;
2329 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2330 host, count, ob->address_retry_include_sender, pending_MAIL,
2331 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2332 {
2333 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2334 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2335 break;
2336
2337 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2338 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2339 case 0: break; /* No 2xx or 5xx, but no probs */
2340
2341 case -1: goto END_OFF; /* Timeout on RCPT */
2342 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2343 }
2344 }
2345
2346/* Save the first address of the next batch. */
2347
2348first_addr = addr;
2349
2350/* If there were no good recipients (but otherwise there have been no
2351problems), just set ok TRUE, since we have handled address-specific errors
2352already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2353for handling the SMTP dot-handling protocol, flagging to apply to headers as
2354well as body. Set the appropriate timeout value to be used for each chunk.
2355(Haven't been able to make it work using select() for writing yet.) */
2356
ff5aac2b
JH
2357if (!ok)
2358 ok = TRUE;
2359else
0756eb3c 2360 {
59932f7d
JH
2361 int options = topt_use_crlf | topt_escape_headers
2362 | (tblock->body_only ? topt_no_headers : 0)
2363 | (tblock->headers_only ? topt_no_body : 0)
2364 | (tblock->return_path_add ? topt_add_return_path : 0)
2365 | (tblock->delivery_date_add ?topt_add_delivery_date :0)
2366 | (tblock->envelope_to_add ? topt_add_envelope_to : 0);
2367 uschar * str_spot, * str_repl;
2368
2369 if (peer_offered & PEER_OFFERED_CHUNKING)
2370 {
2371 options |= topt_use_bdat;
2372 str_spot = str_repl = NULL;
2373 }
2374 else
2375 {
2376 options |= topt_end_dot;
2377 str_spot = US"."; str_repl = US"..";
2378 }
2379
0756eb3c
PH
2380 sigalrm_seen = FALSE;
2381 transport_write_timeout = ob->data_timeout;
2382 smtp_command = US"sending data block"; /* For error messages */
2383 DEBUG(D_transport|D_v)
59932f7d
JH
2384 debug_printf(" SMTP>> writing message %s\n",
2385 peer_offered & PEER_OFFERED_CHUNKING
2386 ? "using CHUNKING" : "and terminating \".\"");
0756eb3c 2387 transport_count = 0;
a7538db1 2388
80a47a2c 2389#ifndef DISABLE_DKIM
4cd12fe9 2390 ok = dkim_transport_write_message(addrlist, inblock.sock,
59932f7d 2391 options,
4cd12fe9 2392 tblock->add_headers, tblock->remove_headers,
59932f7d 2393 str_spot, str_repl, /* Escaping strings */
4cd12fe9 2394 tblock->rewrite_rules, tblock->rewrite_existflags,
ff5aac2b 2395 &ob->dkim
4cd12fe9
TK
2396 );
2397#else
0756eb3c 2398 ok = transport_write_message(addrlist, inblock.sock,
59932f7d 2399 options,
0756eb3c
PH
2400 0, /* No size limit */
2401 tblock->add_headers, tblock->remove_headers,
59932f7d 2402 str_spot, str_repl, /* Escaping strings */
0756eb3c 2403 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2404#endif
0756eb3c
PH
2405
2406 /* transport_write_message() uses write() because it is called from other
2407 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2408 it can exit with "Broken pipe" as its error. This really means that the
2409 socket got closed at the far end. */
2410
2411 transport_write_timeout = 0; /* for subsequent transports */
2412
2413 /* Failure can either be some kind of I/O disaster (including timeout),
2414 or the failure of a transport filter or the expansion of added headers. */
2415
2416 if (!ok)
2417 {
2418 buffer[0] = 0; /* There hasn't been a response */
2419 goto RESPONSE_FAILED;
2420 }
2421
2422 /* We used to send the terminating "." explicitly here, but because of
2423 buffering effects at both ends of TCP/IP connections, you don't gain
2424 anything by keeping it separate, so it might as well go in the final
2425 data buffer for efficiency. This is now done by setting the topt_end_dot
2426 flag above. */
2427
2428 smtp_command = US"end of data";
2429
8ccd00b1 2430#ifndef DISABLE_PRDR
fd98a5c6
JH
2431 /* For PRDR we optionally get a partial-responses warning
2432 * followed by the individual responses, before going on with
2433 * the overall response. If we don't get the warning then deal
2434 * with per non-PRDR. */
2435 if(prdr_active)
2436 {
2437 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2438 ob->final_timeout);
2439 if (!ok && errno == 0)
2440 switch(buffer[0])
2441 {
2442 case '2': prdr_active = FALSE;
2443 ok = TRUE;
2444 break;
2445 case '4': errno = ERRNO_DATA4XX;
2446 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2447 break;
2448 }
2449 }
2450 else
2451#endif
2452
2453 /* For non-PRDR SMTP, we now read a single response that applies to the
2454 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2455
e97957bc
PH
2456 if (!lmtp)
2457 {
2458 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2459 ob->final_timeout);
2460 if (!ok && errno == 0 && buffer[0] == '4')
2461 {
2462 errno = ERRNO_DATA4XX;
2463 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2464 }
2465 }
0756eb3c
PH
2466
2467 /* For LMTP, we get back a response for every RCPT command that we sent;
2468 some may be accepted and some rejected. For those that get a response, their
2469 status is fixed; any that are accepted have been handed over, even if later
2470 responses crash - at least, that's how I read RFC 2033.
2471
2472 If all went well, mark the recipient addresses as completed, record which
2473 host/IPaddress they were delivered to, and cut out RSET when sending another
2474 message down the same channel. Write the completed addresses to the journal
2475 now so that they are recorded in case there is a crash of hardware or
2476 software before the spool gets updated. Also record the final SMTP
2477 confirmation if needed (for SMTP only). */
2478
2479 if (ok)
2480 {
2481 int flag = '=';
2482 int delivery_time = (int)(time(NULL) - start_delivery_time);
2483 int len;
0756eb3c
PH
2484 uschar *conf = NULL;
2485 send_rset = FALSE;
2486
0756eb3c
PH
2487 /* Set up confirmation if needed - applies only to SMTP */
2488
d68218c7 2489 if (
0cbf2b82 2490#ifdef DISABLE_EVENT
6c6d6e48 2491 LOGGING(smtp_confirmation) &&
a7538db1 2492#endif
d68218c7
JH
2493 !lmtp
2494 )
0756eb3c 2495 {
55414b25
JH
2496 const uschar *s = string_printing(buffer);
2497 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2498 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2499 }
2500
fd98a5c6 2501 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2502 each one. */
2503
2504 for (addr = addrlist; addr != first_addr; addr = addr->next)
2505 {
2506 if (addr->transport_return != PENDING_OK) continue;
2507
2508 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2509 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2510 address. For temporary errors, add a retry item for the address so that
2511 it doesn't get tried again too soon. */
0756eb3c 2512
8ccd00b1 2513#ifndef DISABLE_PRDR
fd98a5c6
JH
2514 if (lmtp || prdr_active)
2515#else
0756eb3c 2516 if (lmtp)
fd98a5c6 2517#endif
0756eb3c
PH
2518 {
2519 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2520 ob->final_timeout))
2521 {
2522 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2523 addr->message = string_sprintf(
8ccd00b1 2524#ifndef DISABLE_PRDR
fd98a5c6
JH
2525 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2526#else
2527 "LMTP error after %s: %s",
2528#endif
0756eb3c 2529 big_buffer, string_printing(buffer));
75def545
PH
2530 setflag(addr, af_pass_message); /* Allow message to go to user */
2531 if (buffer[0] == '5')
2532 addr->transport_return = FAIL;
2533 else
2534 {
e97957bc
PH
2535 errno = ERRNO_DATA4XX;
2536 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2537 addr->transport_return = DEFER;
8ccd00b1 2538#ifndef DISABLE_PRDR
fd98a5c6
JH
2539 if (!prdr_active)
2540#endif
2541 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2542 }
0756eb3c
PH
2543 continue;
2544 }
2545 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2546 if (LOGGING(smtp_confirmation))
c0ea85ab 2547 {
55414b25
JH
2548 const uschar *s = string_printing(buffer);
2549 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2550 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2551 }
0756eb3c
PH
2552 }
2553
2554 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2555 actual host that was used. */
0756eb3c
PH
2556
2557 addr->transport_return = OK;
2558 addr->more_errno = delivery_time;
d427a7f9 2559 addr->host_used = host;
0756eb3c
PH
2560 addr->special_action = flag;
2561 addr->message = conf;
8ccd00b1 2562#ifndef DISABLE_PRDR
fd98a5c6
JH
2563 if (prdr_active) addr->flags |= af_prdr_used;
2564#endif
0756eb3c
PH
2565 flag = '-';
2566
8ccd00b1 2567#ifndef DISABLE_PRDR
fd98a5c6
JH
2568 if (!prdr_active)
2569#endif
2570 {
2571 /* Update the journal. For homonymic addresses, use the base address plus
2572 the transport name. See lots of comments in deliver.c about the reasons
2573 for the complications when homonyms are involved. Just carry on after
2574 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2575
fd98a5c6
JH
2576 if (testflag(addr, af_homonym))
2577 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2578 else
2579 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2580
895fbaf2 2581 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH
2582 len = Ustrlen(CS buffer);
2583 if (write(journal_fd, buffer, len) != len)
2584 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2585 "%s: %s", buffer, strerror(errno));
2586 }
0756eb3c
PH
2587 }
2588
8ccd00b1 2589#ifndef DISABLE_PRDR
fd98a5c6
JH
2590 if (prdr_active)
2591 {
2592 /* PRDR - get the final, overall response. For any non-success
2593 upgrade all the address statuses. */
2594 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2595 ob->final_timeout);
2596 if (!ok)
2597 {
2598 if(errno == 0 && buffer[0] == '4')
2599 {
2600 errno = ERRNO_DATA4XX;
2601 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2602 }
2603 for (addr = addrlist; addr != first_addr; addr = addr->next)
2604 if (buffer[0] == '5' || addr->transport_return == OK)
2605 addr->transport_return = PENDING_OK; /* allow set_errno action */
2606 goto RESPONSE_FAILED;
2607 }
2608
2609 /* Update the journal, or setup retry. */
2610 for (addr = addrlist; addr != first_addr; addr = addr->next)
2611 if (addr->transport_return == OK)
2612 {
2613 if (testflag(addr, af_homonym))
2614 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2615 else
2616 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2617
895fbaf2 2618 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH
2619 len = Ustrlen(CS buffer);
2620 if (write(journal_fd, buffer, len) != len)
2621 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2622 "%s: %s", buffer, strerror(errno));
2623 }
2624 else if (addr->transport_return == DEFER)
2625 retry_add_item(addr, addr->address_retry_key, -2);
2626 }
2627#endif
2628
0756eb3c
PH
2629 /* Ensure the journal file is pushed out to disk. */
2630
54fc8428 2631 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2632 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2633 strerror(errno));
2634 }
2635 }
2636
2637
2638/* Handle general (not specific to one address) failures here. The value of ok
2639is used to skip over this code on the falling through case. A timeout causes a
2640deferral. Other errors may defer or fail according to the response code, and
2641may set up a special errno value, e.g. after connection chopped, which is
2642assumed if errno == 0 and there is no text in the buffer. If control reaches
2643here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2644the problem is not related to this specific message. */
2645
2646if (!ok)
2647 {
895fbaf2
JH
2648 int code, set_rc;
2649 uschar * set_message;
0756eb3c
PH
2650
2651 RESPONSE_FAILED:
895fbaf2
JH
2652 {
2653 save_errno = errno;
2654 message = NULL;
2655 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2656 buffer, &code, &message, &pass_message);
2657 goto FAILED;
2658 }
0756eb3c
PH
2659
2660 SEND_FAILED:
895fbaf2
JH
2661 {
2662 save_errno = errno;
2663 code = '4';
2664 message = US string_sprintf("send() to %s [%s] failed: %s",
2665 host->name, host->address, strerror(save_errno));
2666 send_quit = FALSE;
2667 goto FAILED;
2668 }
0756eb3c
PH
2669
2670 /* This label is jumped to directly when a TLS negotiation has failed,
2671 or was not done for a host for which it is required. Values will be set
2672 in message and save_errno, and setting_up will always be true. Treat as
2673 a temporary error. */
2674
a7538db1 2675#ifdef SUPPORT_TLS
0756eb3c
PH
2676 TLS_FAILED:
2677 code = '4';
a7538db1 2678#endif
0756eb3c
PH
2679
2680 /* If the failure happened while setting up the call, see if the failure was
2681 a 5xx response (this will either be on connection, or following HELO - a 5xx
2682 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2683 never going to accept them. For other errors during setting up (timeouts or
2684 whatever), defer all addresses, and yield DEFER, so that the host is not
2685 tried again for a while. */
2686
2687 FAILED:
2688 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2689 set_message = message;
0756eb3c
PH
2690
2691 if (setting_up)
2692 {
2693 if (code == '5')
895fbaf2 2694 set_rc = FAIL;
0756eb3c 2695 else
895fbaf2 2696 yield = set_rc = DEFER;
0756eb3c
PH
2697 }
2698
e97957bc 2699 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2700 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2701 the contents of the message rather than a real error on the connection. These
2702 cases are treated in the same way as a 4xx response. This next bit of code
2703 does the classification. */
0756eb3c 2704
e97957bc 2705 else
0756eb3c 2706 {
e97957bc 2707 BOOL message_error;
0756eb3c 2708
e97957bc
PH
2709 switch(save_errno)
2710 {
8c5d388a 2711#ifdef SUPPORT_I18N
250b6871
JH
2712 case ERRNO_UTF8_FWD:
2713 code = '5';
2714 /*FALLTHROUGH*/
2715#endif
e97957bc
PH
2716 case 0:
2717 case ERRNO_MAIL4XX:
2718 case ERRNO_DATA4XX:
250b6871
JH
2719 message_error = TRUE;
2720 break;
0756eb3c 2721
e97957bc 2722 case ETIMEDOUT:
250b6871
JH
2723 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2724 Ustrncmp(smtp_command,"end ",4) == 0;
2725 break;
e97957bc
PH
2726
2727 case ERRNO_SMTPCLOSED:
250b6871
JH
2728 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2729 break;
e97957bc
PH
2730
2731 default:
250b6871
JH
2732 message_error = FALSE;
2733 break;
e97957bc 2734 }
0756eb3c 2735
e97957bc 2736 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2737
e97957bc
PH
2738 (a) negative response or timeout after MAIL
2739 (b) negative response after DATA
2740 (c) negative response or timeout or dropped connection after "."
250b6871 2741 (d) utf8 support required and not offered
0756eb3c 2742
e97957bc
PH
2743 It won't be a negative response or timeout after RCPT, as that is dealt
2744 with separately above. The action in all cases is to set an appropriate
2745 error code for all the addresses, but to leave yield set to OK because the
2746 host itself has not failed. Of course, it might in practice have failed
2747 when we've had a timeout, but if so, we'll discover that at the next
2748 delivery attempt. For a temporary error, set the message_defer flag, and
2749 write to the logs for information if this is not the last host. The error
2750 for the last host will be logged as part of the address's log line. */
2751
2752 if (message_error)
0756eb3c 2753 {
e97957bc 2754 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH
2755
2756 /* If there's an errno, the message contains just the identity of
2757 the host. */
2758
895fbaf2
JH
2759 if (code == '5')
2760 set_rc = FAIL;
2761 else /* Anything other than 5 is treated as temporary */
e97957bc 2762 {
895fbaf2 2763 set_rc = DEFER;
e97957bc
PH
2764 if (save_errno > 0)
2765 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2766 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2767 msglog_line(host, message);
e97957bc
PH
2768 *message_defer = TRUE;
2769 }
2770 }
2771
2772 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2773 ".", or some other transportation error. We defer all addresses and yield
2774 DEFER, except for the case of failed add_headers expansion, or a transport
2775 filter failure, when the yield should be ERROR, to stop it trying other
2776 hosts. */
2777
2778 else
2779 {
895fbaf2 2780 set_rc = DEFER;
e97957bc
PH
2781 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2782 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH
2783 }
2784 }
895fbaf2
JH
2785
2786 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2787#ifdef EXPERIMENTAL_DSN_INFO
2788 , smtp_greeting, helo_response
2789#endif
2790 );
0756eb3c
PH
2791 }
2792
2793
2794/* If all has gone well, send_quit will be set TRUE, implying we can end the
2795SMTP session tidily. However, if there were too many addresses to send in one
2796message (indicated by first_addr being non-NULL) we want to carry on with the
2797rest of them. Also, it is desirable to send more than one message down the SMTP
2798connection if there are several waiting, provided we haven't already sent so
2799many as to hit the configured limit. The function transport_check_waiting looks
2800for a waiting message and returns its id. Then transport_pass_socket tries to
2801set up a continued delivery by passing the socket on to another process. The
2802variable send_rset is FALSE if a message has just been successfully transfered.
2803
2804If we are already sending down a continued channel, there may be further
2805addresses not yet delivered that are aimed at the same host, but which have not
2806been passed in this run of the transport. In this case, continue_more will be
2807true, and all we should do is send RSET if necessary, and return, leaving the
2808channel open.
2809
2810However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2811do not want to continue with other messages down the same channel, because that
2812can lead to looping between two or more messages, all with the same,
2813temporarily failing address(es). [The retry information isn't updated yet, so
2814new processes keep on trying.] We probably also don't want to try more of this
2815message's addresses either.
2816
2817If we have started a TLS session, we have to end it before passing the
2818connection to a new process. However, not all servers can handle this (Exim
2819can), so we do not pass such a connection on if the host matches
2820hosts_nopass_tls. */
2821
2822DEBUG(D_transport)
2823 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2824 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2825 continue_more, yield, (first_addr == NULL)? "":"not ");
2826
2827if (completed_address && ok && send_quit)
2828 {
2829 BOOL more;
a39bd74d
JB
2830 smtp_compare_t t_compare;
2831
2832 t_compare.tblock = tblock;
2833 t_compare.current_sender_address = sender_address;
2834
5130845b
JH
2835 if ( first_addr != NULL
2836 || continue_more
2837 || ( ( tls_out.active < 0
2838 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2839 )
0756eb3c
PH
2840 &&
2841 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
2842 tblock->connection_max_messages, new_message_id, &more,
2843 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2844 ) )
0756eb3c
PH
2845 {
2846 uschar *msg;
447d236c 2847 BOOL pass_message;
0756eb3c
PH
2848
2849 if (send_rset)
2850 {
2851 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2852 {
2853 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2854 host->address, strerror(save_errno));
2855 send_quit = FALSE;
2856 }
2857 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2858 ob->command_timeout)))
2859 {
2860 int code;
447d236c
PH
2861 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2862 &pass_message);
0756eb3c
PH
2863 if (!send_quit)
2864 {
c562fd30
JH
2865 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2866 host->name, host->address, msg);
0756eb3c
PH
2867 }
2868 }
2869 }
2870
2871 /* Either RSET was not needed, or it succeeded */
2872
2873 if (ok)
2874 {
2875 if (first_addr != NULL) /* More addresses still to be sent */
2876 { /* in this run of the transport */
2877 continue_sequence++; /* Causes * in logging */
2878 goto SEND_MESSAGE;
2879 }
2880 if (continue_more) return yield; /* More addresses for another run */
2881
2882 /* Pass the socket to a new Exim process. Before doing so, we must shut
2883 down TLS. Not all MTAs allow for the continuation of the SMTP session
2884 when TLS is shut down. We test for this by sending a new EHLO. If we
2885 don't get a good response, we don't attempt to pass the socket on. */
2886
a7538db1 2887#ifdef SUPPORT_TLS
817d9f57 2888 if (tls_out.active >= 0)
0756eb3c 2889 {
817d9f57 2890 tls_close(FALSE, TRUE);
061b7ebd
PP
2891 if (smtps)
2892 ok = FALSE;
2893 else
2894 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2895 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2896 ob->command_timeout);
0756eb3c 2897 }
a7538db1 2898#endif
0756eb3c
PH
2899
2900 /* If the socket is successfully passed, we musn't send QUIT (or
2901 indeed anything!) from here. */
2902
895fbaf2
JH
2903/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2904propagate it from the initial
2905*/
0756eb3c
PH
2906 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2907 new_message_id, inblock.sock))
2908 {
2909 send_quit = FALSE;
2910 }
2911 }
2912
2913 /* If RSET failed and there are addresses left, they get deferred. */
2914
895fbaf2
JH
2915 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2916#ifdef EXPERIMENTAL_DSN_INFO
2917 , smtp_greeting, helo_response
2918#endif
2919 );
0756eb3c
PH
2920 }
2921 }
2922
2923/* End off tidily with QUIT unless the connection has died or the socket has
2924been passed to another process. There has been discussion on the net about what
2925to do after sending QUIT. The wording of the RFC suggests that it is necessary
2926to wait for a response, but on the other hand, there isn't anything one can do
2927with an error response, other than log it. Exim used to do that. However,
2928further discussion suggested that it is positively advantageous not to wait for
2929the response, but to close the session immediately. This is supposed to move
2930the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2931load from the server. (Hosts that are both servers and clients may not see much
2932difference, of course.) Further discussion indicated that this was safe to do
2933on Unix systems which have decent implementations of TCP/IP that leave the
2934connection around for a while (TIME_WAIT) after the application has gone away.
2935This enables the response sent by the server to be properly ACKed rather than
2936timed out, as can happen on broken TCP/IP implementations on other OS.
2937
2938This change is being made on 31-Jul-98. After over a year of trouble-free
2939operation, the old commented-out code was removed on 17-Sep-99. */
2940
2941SEND_QUIT:
2942if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2943
2944END_OFF:
2945
2946#ifdef SUPPORT_TLS
817d9f57 2947tls_close(FALSE, TRUE);
0756eb3c
PH
2948#endif
2949
2950/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2951works because the NULL setting is passed back to the calling process, and
2952remote_max_parallel is forced to 1 when delivering over an existing connection,
2953
2954If all went well and continue_more is set, we shouldn't actually get here if
2955there are further addresses, as the return above will be taken. However,
2956writing RSET might have failed, or there may be other addresses whose hosts are
2957specified in the transports, and therefore not visible at top level, in which
2958case continue_more won't get set. */
2959
b9d9c5a2 2960HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
f1e894f3 2961(void)close(inblock.sock);
a7538db1 2962
0cbf2b82 2963#ifndef DISABLE_EVENT
774ef2d7 2964(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2965#endif
2966
0756eb3c
PH
2967continue_transport = NULL;
2968continue_hostname = NULL;
2969return yield;
2970}
2971
2972
2973
2974
2975/*************************************************
2976* Closedown entry point *
2977*************************************************/
2978
2979/* This function is called when exim is passed an open smtp channel
2980from another incarnation, but the message which it has been asked
2981to deliver no longer exists. The channel is on stdin.
2982
2983We might do fancy things like looking for another message to send down
2984the channel, but if the one we sought has gone, it has probably been
2985delivered by some other process that itself will seek further messages,
2986so just close down our connection.
2987
2988Argument: pointer to the transport instance block
2989Returns: nothing
2990*/
2991
2992void
2993smtp_transport_closedown(transport_instance *tblock)
2994{
2995smtp_transport_options_block *ob =
2996 (smtp_transport_options_block *)(tblock->options_block);
2997smtp_inblock inblock;
2998smtp_outblock outblock;
2999uschar buffer[256];
3000uschar inbuffer[4096];
3001uschar outbuffer[16];
3002
3003inblock.sock = fileno(stdin);
3004inblock.buffer = inbuffer;
3005inblock.buffersize = sizeof(inbuffer);
3006inblock.ptr = inbuffer;
3007inblock.ptrend = inbuffer;
3008
3009outblock.sock = inblock.sock;
3010outblock.buffersize = sizeof(outbuffer);
3011outblock.buffer = outbuffer;
3012outblock.ptr = outbuffer;
3013outblock.cmd_count = 0;
3014outblock.authenticating = FALSE;
3015
3016(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3017(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3018 ob->command_timeout);
f1e894f3 3019(void)close(inblock.sock);
0756eb3c
PH
3020}
3021
3022
3023
3024/*************************************************
3025* Prepare addresses for delivery *
3026*************************************************/
3027
3028/* This function is called to flush out error settings from previous delivery
3029attempts to other hosts. It also records whether we got here via an MX record
3030or not in the more_errno field of the address. We are interested only in
3031addresses that are still marked DEFER - others may have got delivered to a
3032previously considered IP address. Set their status to PENDING_DEFER to indicate
3033which ones are relevant this time.
3034
3035Arguments:
3036 addrlist the list of addresses
3037 host the host we are delivering to
3038
3039Returns: the first address for this delivery
3040*/
3041
3042static address_item *
3043prepare_addresses(address_item *addrlist, host_item *host)
3044{
3045address_item *first_addr = NULL;
3046address_item *addr;
3047for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
3048 if (addr->transport_return == DEFER)
3049 {
3050 if (first_addr == NULL) first_addr = addr;
3051 addr->transport_return = PENDING_DEFER;
3052 addr->basic_errno = 0;
3053 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3054 addr->message = NULL;
a7538db1 3055#ifdef SUPPORT_TLS
168dec3b
JH
3056 addr->cipher = NULL;
3057 addr->ourcert = NULL;
3058 addr->peercert = NULL;
3059 addr->peerdn = NULL;
3060 addr->ocsp = OCSP_NOT_REQ;
a7538db1 3061#endif
895fbaf2
JH
3062#ifdef EXPERIMENTAL_DSN_INFO
3063 addr->smtp_greeting = NULL;
3064 addr->helo_response = NULL;
3065#endif
168dec3b 3066 }
0756eb3c
PH
3067return first_addr;
3068}
3069
3070
3071
3072/*************************************************
3073* Main entry point *
3074*************************************************/
3075
3076/* See local README for interface details. As this is a remote transport, it is
3077given a chain of addresses to be delivered in one connection, if possible. It
3078always returns TRUE, indicating that each address has its own independent
3079status set, except if there is a setting up problem, in which case it returns
3080FALSE. */
3081
3082BOOL
3083smtp_transport_entry(
3084 transport_instance *tblock, /* data for this instantiation */
3085 address_item *addrlist) /* addresses we are working on */
3086{
3087int cutoff_retry;
3088int port;
3089int hosts_defer = 0;
3090int hosts_fail = 0;
3091int hosts_looked_up = 0;
3092int hosts_retry = 0;
3093int hosts_serial = 0;
3094int hosts_total = 0;
8e669ac1 3095int total_hosts_tried = 0;
0756eb3c
PH
3096address_item *addr;
3097BOOL expired = TRUE;
3098BOOL continuing = continue_hostname != NULL;
3099uschar *expanded_hosts = NULL;
3100uschar *pistring;
3101uschar *tid = string_sprintf("%s transport", tblock->name);
3102smtp_transport_options_block *ob =
3103 (smtp_transport_options_block *)(tblock->options_block);
3104host_item *hostlist = addrlist->host_list;
3105host_item *host = NULL;
3106
3107DEBUG(D_transport)
3108 {
3109 debug_printf("%s transport entered\n", tblock->name);
3110 for (addr = addrlist; addr != NULL; addr = addr->next)
3111 debug_printf(" %s\n", addr->address);
3112 if (continuing) debug_printf("already connected to %s [%s]\n",
3113 continue_hostname, continue_host_address);
3114 }
3115
f6c332bd
PH
3116/* Set the flag requesting that these hosts be added to the waiting
3117database if the delivery fails temporarily or if we are running with
3118queue_smtp or a 2-stage queue run. This gets unset for certain
3119kinds of error, typically those that are specific to the message. */
3120
3121update_waiting = TRUE;
3122
0756eb3c
PH
3123/* If a host list is not defined for the addresses - they must all have the
3124same one in order to be passed to a single transport - or if the transport has
3125a host list with hosts_override set, use the host list supplied with the
3126transport. It is an error for this not to exist. */
3127
3128if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3129 {
3130 if (ob->hosts == NULL)
3131 {
3132 addrlist->message = string_sprintf("%s transport called with no hosts set",
3133 tblock->name);
3134 addrlist->transport_return = PANIC;
3135 return FALSE; /* Only top address has status */
3136 }
3137
3138 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3139 ob->hosts);
3140
3141 /* If the transport's host list contains no '$' characters, and we are not
3142 randomizing, it is fixed and therefore a chain of hosts can be built once
3143 and for all, and remembered for subsequent use by other calls to this
3144 transport. If, on the other hand, the host list does contain '$', or we are
3145 randomizing its order, we have to rebuild it each time. In the fixed case,
3146 as the hosts string will never be used again, it doesn't matter that we
3147 replace all the : characters with zeros. */
3148
3149 if (ob->hostlist == NULL)
3150 {
3151 uschar *s = ob->hosts;
3152
3153 if (Ustrchr(s, '$') != NULL)
3154 {
d427a7f9 3155 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
3156 {
3157 addrlist->message = string_sprintf("failed to expand list of hosts "
3158 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3159 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3160 return FALSE; /* Only top address has status */
3161 }
3162 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3163 "\"%s\"\n", s, expanded_hosts);
3164 s = expanded_hosts;
3165 }
3166 else
3167 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3168
3169 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3170
e276e04b
TF
3171 /* Check that the expansion yielded something useful. */
3172 if (hostlist == NULL)
3173 {
3174 addrlist->message =
3175 string_sprintf("%s transport has empty hosts setting", tblock->name);
3176 addrlist->transport_return = PANIC;
3177 return FALSE; /* Only top address has status */
3178 }
3179
0756eb3c
PH
3180 /* If there was no expansion of hosts, save the host list for
3181 next time. */
3182
d427a7f9 3183 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
3184 }
3185
3186 /* This is not the first time this transport has been run in this delivery;
3187 the host list was built previously. */
3188
55414b25
JH
3189 else
3190 hostlist = ob->hostlist;
0756eb3c
PH
3191 }
3192
3193/* The host list was supplied with the address. If hosts_randomize is set, we
3194must sort it into a random order if it did not come from MX records and has not
3195already been randomized (but don't bother if continuing down an existing
3196connection). */
3197
3198else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3199 {
3200 host_item *newlist = NULL;
3201 while (hostlist != NULL)
3202 {
3203 host_item *h = hostlist;
3204 hostlist = hostlist->next;
3205
3206 h->sort_key = random_number(100);
3207
3208 if (newlist == NULL)
3209 {
3210 h->next = NULL;
3211 newlist = h;
3212 }
3213 else if (h->sort_key < newlist->sort_key)
3214 {
3215 h->next = newlist;
3216 newlist = h;
3217 }
3218 else
3219 {
3220 host_item *hh = newlist;
3221 while (hh->next != NULL)
3222 {
3223 if (h->sort_key < hh->next->sort_key) break;
3224 hh = hh->next;
3225 }
3226 h->next = hh->next;
3227 hh->next = h;
3228 }
3229 }
3230
3231 hostlist = addrlist->host_list = newlist;
3232 }
3233
2d280592 3234/* Sort out the default port. */
0756eb3c
PH
3235
3236if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3237
0756eb3c
PH
3238/* For each host-plus-IP-address on the list:
3239
3240. If this is a continued delivery and the host isn't the one with the
3241 current connection, skip.
3242
3243. If the status is unusable (i.e. previously failed or retry checked), skip.
3244
3245. If no IP address set, get the address, either by turning the name into
3246 an address, calling gethostbyname if gethostbyname is on, or by calling
3247 the DNS. The DNS may yield multiple addresses, in which case insert the
3248 extra ones into the list.
3249
3250. Get the retry data if not previously obtained for this address and set the
3251 field which remembers the state of this address. Skip if the retry time is
3252 not reached. If not, remember whether retry data was found. The retry string
3253 contains both the name and the IP address.
3254
3255. Scan the list of addresses and mark those whose status is DEFER as
3256 PENDING_DEFER. These are the only ones that will be processed in this cycle
3257 of the hosts loop.
3258
3259. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3260 Some addresses may be successfully delivered, others may fail, and yet
3261 others may get temporary errors and so get marked DEFER.
3262
3263. The return from the delivery attempt is OK if a connection was made and a
3264 valid SMTP dialogue was completed. Otherwise it is DEFER.
3265
3266. If OK, add a "remove" retry item for this host/IPaddress, if any.
3267
3268. If fail to connect, or other defer state, add a retry item.
3269
3270. If there are any addresses whose status is still DEFER, carry on to the
3271 next host/IPaddress, unless we have tried the number of hosts given
533244af 3272 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
3273 there is some fancy logic for hosts_max_try that means its limit can be
3274 overstepped in some circumstances.
0756eb3c
PH
3275
3276If we get to the end of the list, all hosts have deferred at least one address,
3277or not reached their retry times. If delay_after_cutoff is unset, it requests a
3278delivery attempt to those hosts whose last try was before the arrival time of
3279the current message. To cope with this, we have to go round the loop a second
3280time. After that, set the status and error data for any addresses that haven't
3281had it set already. */
3282
3283for (cutoff_retry = 0; expired &&
3284 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3285 cutoff_retry++)
3286 {
3287 host_item *nexthost = NULL;
3288 int unexpired_hosts_tried = 0;
3289
3290 for (host = hostlist;
8e669ac1 3291 host != NULL &&
533244af
PH
3292 unexpired_hosts_tried < ob->hosts_max_try &&
3293 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
3294 host = nexthost)
3295 {
3296 int rc;
3297 int host_af;
3298 uschar *rs;
3299 BOOL serialized = FALSE;
3300 BOOL host_is_expired = FALSE;
3301 BOOL message_defer = FALSE;
0756eb3c
PH
3302 BOOL some_deferred = FALSE;
3303 address_item *first_addr = NULL;
3304 uschar *interface = NULL;
3305 uschar *retry_host_key = NULL;
3306 uschar *retry_message_key = NULL;
3307 uschar *serialize_key = NULL;
3308
9c4e8f60
PH
3309 /* Default next host is next host. :-) But this can vary if the
3310 hosts_max_try limit is hit (see below). It may also be reset if a host
3311 address is looked up here (in case the host was multihomed). */
3312
3313 nexthost = host->next;
3314
0756eb3c
PH
3315 /* If the address hasn't yet been obtained from the host name, look it up
3316 now, unless the host is already marked as unusable. If it is marked as
3317 unusable, it means that the router was unable to find its IP address (in
3318 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3319 the lookup failed last time. We don't get this far if *all* MX records
3320 point to non-existent hosts; that is treated as a hard error.
3321
3322 We can just skip this host entirely. When the hosts came from the router,
3323 the address will timeout based on the other host(s); when the address is
3324 looked up below, there is an explicit retry record added.
3325
3326 Note that we mustn't skip unusable hosts if the address is not unset; they
3327 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3328
3329 if (host->address == NULL)
3330 {
322050c2 3331 int new_port, flags;
7cd1141b 3332 host_item *hh;
0756eb3c
PH
3333
3334 if (host->status >= hstatus_unusable)
3335 {
3336 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3337 host->name);
3338 continue;
3339 }
3340
3341 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3342
7cd1141b
PH
3343 /* The host name is permitted to have an attached port. Find it, and
3344 strip it from the name. Just remember it for now. */
3345
3346 new_port = host_item_get_port(host);
3347
3348 /* Count hosts looked up */
3349
0756eb3c
PH
3350 hosts_looked_up++;
3351
3352 /* Find by name if so configured, or if it's an IP address. We don't
3353 just copy the IP address, because we need the test-for-local to happen. */
3354
322050c2
PH
3355 flags = HOST_FIND_BY_A;
3356 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3357 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3358
7e66e54d 3359 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3360 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3361 else
0756eb3c 3362 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3363 &ob->dnssec, /* domains for request/require */
55414b25 3364 NULL, NULL);
0756eb3c 3365
7cd1141b
PH
3366 /* Update the host (and any additional blocks, resulting from
3367 multihoming) with a host-specific port, if any. */
3368
3369 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3370
0756eb3c
PH
3371 /* Failure to find the host at this time (usually DNS temporary failure)
3372 is really a kind of routing failure rather than a transport failure.
3373 Therefore we add a retry item of the routing kind, not to stop us trying
3374 to look this name up here again, but to ensure the address gets timed
3375 out if the failures go on long enough. A complete failure at this point
3376 commonly points to a configuration error, but the best action is still
3377 to carry on for the next host. */
3378
3379 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3380 {
3381 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3382 expired = FALSE;
3383 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3384 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3385 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3386 host->status = hstatus_unusable;
3387
3388 for (addr = addrlist; addr != NULL; addr = addr->next)
3389 {
3390 if (addr->transport_return != DEFER) continue;
3391 addr->basic_errno = ERRNO_UNKNOWNHOST;
3392 addr->message =
3393 string_sprintf("failed to lookup IP address for %s", host->name);
3394 }
3395 continue;
3396 }
3397
3398 /* If the host is actually the local host, we may have a problem, or
3399 there may be some cunning configuration going on. In the problem case,
3400 log things and give up. The default transport status is already DEFER. */
3401
3402 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3403 {
3404 for (addr = addrlist; addr != NULL; addr = addr->next)
3405 {
3406 addr->basic_errno = 0;
3407 addr->message = string_sprintf("%s transport found host %s to be "
3408 "local", tblock->name, host->name);
3409 }
3410 goto END_TRANSPORT;
3411 }
3412 } /* End of block for IP address lookup */
3413
3414 /* If this is a continued delivery, we are interested only in the host
3415 which matches the name of the existing open channel. The check is put
3416 here after the local host lookup, in case the name gets expanded as a
3417 result of the lookup. Set expired FALSE, to save the outer loop executing
3418 twice. */
3419
3420 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3421 Ustrcmp(continue_host_address, host->address) != 0))
3422 {
3423 expired = FALSE;
3424 continue; /* With next host */
3425 }
3426
9c4e8f60
PH
3427 /* Reset the default next host in case a multihomed host whose addresses
3428 are not looked up till just above added to the host list. */
83364d30
PH
3429
3430 nexthost = host->next;
3431
0756eb3c
PH
3432 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3433 domain is in queue_smtp_domains, we don't actually want to attempt any
3434 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3435 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3436