Split out cutthrough connection-cache / subsequent-rcpt handling, from do_callout()
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH
1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
80fea873 5/* Copyright (c) University of Cambridge 1995 - 2016 */
0756eb3c
PH
6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
0756eb3c
PH
11
12/* Options specific to the smtp transport. This transport also supports LMTP
13over TCP/IP. The options must be in alphabetic order (note that "_" comes
14before the lower case letters). Some live in the transport_instance block so as
15to be publicly visible; these are flagged with opt_public. */
16
17optionlist smtp_transport_options[] = {
506900af
JH
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
9c695f6d
JH
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
48c7f9e2
PH
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
0756eb3c
PH
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
382afc6b
PH
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
0756eb3c
PH
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 41#ifndef DISABLE_DKIM
f7572e5a 42 { "dkim_canon", opt_stringptr,
ff5aac2b 43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
f7572e5a 44 { "dkim_domain", opt_stringptr,
ff5aac2b 45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
f7572e5a 46 { "dkim_private_key", opt_stringptr,
ff5aac2b 47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 48 { "dkim_selector", opt_stringptr,
ff5aac2b 49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 50 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 52 { "dkim_strict", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
80a47a2c 54#endif
0756eb3c
PH
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 59 { "dnssec_request_domains", opt_stringptr,
7cd171b7 60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 61 { "dnssec_require_domains", opt_stringptr,
7cd171b7 62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
9e4f5962
PP
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
0756eb3c
PH
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 79#ifdef SUPPORT_TLS
0756eb3c
PH
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 82#endif
0756eb3c
PH
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 87#ifdef SUPPORT_TLS
0756eb3c
PH
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 90#endif
0756eb3c
PH
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 95#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
44662487
JH
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
98#endif
0756eb3c
PH
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 101#ifdef SUPPORT_TLS
7a31d643
JH
102# ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
105# endif
f2de3a33 106# ifndef DISABLE_OCSP
f5d78688
JH
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
109# endif
0756eb3c
PH
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 112#endif
0756eb3c
PH
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
f98442df
JH
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
7a31d643 117#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
96e47838
TL
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
120#endif
fb05276a
JH
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
8ccd00b1 123#ifndef DISABLE_PRDR
fd98a5c6
JH
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126#endif
99400968
JH
127#ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130#endif
0756eb3c
PH
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
506900af 139 { "multi_domain", opt_expand_bool | opt_public,
0756eb3c
PH
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 145 { "retry_include_ip_address", opt_expand_bool,
0756eb3c
PH
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 151#ifdef SUPPORT_SOCKS
7eb6c37c
JH
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154#endif
80a47a2c 155#ifdef SUPPORT_TLS
0756eb3c
PH
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 164 { "tls_require_ciphers", opt_stringptr,
0756eb3c 165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
a63be306
WB
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
e51c7be2
JH
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 174 { "tls_verify_certificates", opt_stringptr,
a63be306
WB
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 178#endif
0756eb3c
PH
179};
180
181/* Size of the options list. An extern variable has to be used so that its
182address can appear in the tables drtables.c. */
183
184int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187/* Default private options block for the smtp transport. */
188
189smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
9e4f5962 199 NULL, /* DSCP */
0756eb3c
PH
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
f98442df 203 US"*", /* hosts_try_chunking */
96e47838
TL
204#ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
7a31d643 206 NULL, /* hosts_require_dane */
96e47838 207#endif
fb05276a 208 NULL, /* hosts_try_fastopen */
8ccd00b1 209#ifndef DISABLE_PRDR
f98442df 210 US"*", /* hosts_try_prdr */
fd98a5c6 211#endif
f2de3a33 212#ifndef DISABLE_OCSP
0e66b3b6 213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688
JH
214 NULL, /* hosts_require_ocsp */
215#endif
0756eb3c
PH
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
6c9ed72e 218 NULL, /* hosts_verify_avoid_tls */
c51b8e75 219 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
8e669ac1 228 50, /* hosts_max_try_hardlimit */
48c7f9e2 229 TRUE, /* address_retry_include_sender */
0756eb3c 230 FALSE, /* allow_localhost */
382afc6b 231 FALSE, /* authenticated_sender_force */
0756eb3c
PH
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
0539a19d 235 { NULL, NULL }, /* dnssec_domains {request,require} */
0756eb3c
PH
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
f1513293 240 FALSE, /* lmtp_ignore_quota */
9c695f6d 241 NULL, /* expand_retry_include_ip_address */
0756eb3c 242 TRUE /* retry_include_ip_address */
f0989ec0 243#ifdef SUPPORT_SOCKS
7eb6c37c 244 ,NULL /* socks_proxy */
b8bf753b 245#endif
80a47a2c 246#ifdef SUPPORT_TLS
0756eb3c
PH
247 ,NULL, /* tls_certificate */
248 NULL, /* tls_crl */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
54c90be1 251 NULL, /* tls_sni */
0e0f3f56 252 US"system", /* tls_verify_certificates */
54c90be1
PP
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
a63be306
WB
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
610ff438 257 US"*", /* tls_try_verify_hosts */
01a4a5c5 258 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK
259#endif
260#ifndef DISABLE_DKIM
ff5aac2b
JH
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
e983e85a
JH
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
80a47a2c 268#endif
0756eb3c
PH
269};
270
6c1c3d1d
WB
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" };
6c1c3d1d
WB
277
278
0756eb3c
PH
279
280/* Local statics */
281
87cb4a16
JH
282static uschar *smtp_command; /* Points to last cmd for error messages */
283static uschar *mail_command; /* Points to MAIL cmd for error messages */
284static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285static BOOL update_waiting; /* TRUE to update the "wait" database */
286static BOOL pipelining_active; /* current transaction is in pipe mode */
0756eb3c
PH
287
288
289/*************************************************
290* Setup entry point *
291*************************************************/
292
293/* This function is called when the transport is about to be used,
294but before running it in a sub-process. It is used for two things:
295
296 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
0756eb3c
PH
299
300Arguments:
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
929ba01c
PH
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
0756eb3c
PH
306 errmsg place for error message (not used)
307
308Returns: OK always (FAIL, DEFER not used)
309*/
310
311static int
312smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH
314{
315smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
317
318errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH
319uid = uid;
320gid = gid;
0756eb3c
PH
321
322/* Pass back options if required. This interface is getting very messy. */
323
02b41d71 324if (tf)
0756eb3c
PH
325 {
326 tf->interface = ob->interface;
327 tf->port = ob->port;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
26da7e20 335 tf->helo_data = ob->helo_data;
0756eb3c
PH
336 }
337
338/* Set the fallback host list for all the addresses that don't have fallback
339host lists, provided that the local host wasn't present in the original host
340list. */
341
342if (!testflag(addrlist, af_local_host_removed))
02b41d71
JH
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
0756eb3c
PH
345
346return OK;
347}
348
349
350
351/*************************************************
352* Initialization entry point *
353*************************************************/
354
355/* Called for each instance, after its options have been read, to
356enable consistency checks to be done, or anything else that needs
357to be set up.
358
359Argument: pointer to the transport instance block
360Returns: nothing
361*/
362
363void
364smtp_transport_init(transport_instance *tblock)
365{
366smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
368
369/* Retry_use_local_part defaults FALSE if unset */
370
371if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
373
374/* Set the default port according to the protocol */
375
376if (ob->port == NULL)
061b7ebd
PP
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH
379
380/* Set up the setup entry point, to be called before subprocesses for this
381transport. */
382
383tblock->setup = smtp_transport_setup;
384
385/* Complain if any of the timeouts are zero. */
386
387if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
391 tblock->name);
392
393/* If hosts_override is set and there are local hosts, set the global
394flag that stops verify from showing router hosts. */
395
396if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
397
398/* If there are any fallback hosts listed, build a chain of host items
399for them, but do not do any lookups at this time. */
400
401host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
402}
403
404
405
406
407
408/*************************************************
409* Set delivery info into all active addresses *
410*************************************************/
411
412/* Only addresses whose status is >= PENDING are relevant. A lesser
413status means that an address is not currently being processed.
414
415Arguments:
447d236c
PH
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 421 host if set, mark addrs as having used this host
895fbaf2
JH
422 smtp_greeting from peer
423 helo_response from peer
0756eb3c
PH
424
425If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
426the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
427this particular type of timeout.
428
429Returns: nothing
430*/
431
7cd1141b
PH
432static void
433set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
895fbaf2
JH
434 BOOL pass_message, host_item * host
435#ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
437#endif
438 )
0756eb3c
PH
439{
440address_item *addr;
441int orvalue = 0;
442if (errno_value == ERRNO_CONNECTTIMEOUT)
443 {
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
446 }
895fbaf2 447for (addr = addrlist; addr; addr = addr->next)
168dec3b 448 if (addr->transport_return >= PENDING)
447d236c 449 {
168dec3b
JH
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
02b41d71 452 if (msg)
168dec3b
JH
453 {
454 addr->message = msg;
455 if (pass_message) setflag(addr, af_pass_message);
456 }
457 addr->transport_return = rc;
458 if (host)
895fbaf2 459 {
168dec3b 460 addr->host_used = host;
895fbaf2
JH
461#ifdef EXPERIMENTAL_DSN_INFO
462 if (smtp_greeting)
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
465
466 if (helo_response)
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
469#endif
470 }
447d236c 471 }
0756eb3c
PH
472}
473
895fbaf2
JH
474static void
475set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
476 BOOL pass_message)
477{
478set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479#ifdef EXPERIMENTAL_DSN_INFO
480 , NULL, NULL
481#endif
482 );
483}
0756eb3c
PH
484
485
486/*************************************************
487* Check an SMTP response *
488*************************************************/
489
490/* This function is given an errno code and the SMTP response buffer
491to analyse, together with the host identification for generating messages. It
492sets an appropriate message and puts the first digit of the response code into
493the yield variable. If no response was actually read, a suitable digit is
494chosen.
495
496Arguments:
447d236c
PH
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
4c04137d 502 message where to put an error message
447d236c
PH
503 pass_message set TRUE if message is an SMTP response
504
505Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
506*/
507
a7538db1
JH
508static BOOL
509check_response(host_item *host, int *errno_value, int more_errno,
447d236c 510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 511{
0d9fa8c0 512uschar * pl = pipelining_active ? US"pipelined " : US"";
0756eb3c
PH
513
514*yield = '4'; /* Default setting is to give a temporary error */
515
516/* Handle response timeout */
517
518if (*errno_value == ETIMEDOUT)
519 {
c562fd30
JH
520 *message = US string_sprintf("SMTP timeout after %s%s",
521 pl, smtp_command);
0756eb3c
PH
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
524 transport_count);
525 return FALSE;
526 }
527
528/* Handle malformed SMTP response */
529
530if (*errno_value == ERRNO_SMTPFORMAT)
531 {
55414b25 532 const uschar *malfresp = string_printing(buffer);
0756eb3c 533 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
0756eb3c
PH
539 return FALSE;
540 }
541
542/* Handle a failed filter process error; can't send QUIT as we mustn't
543end the DATA. */
544
545if (*errno_value == ERRNO_FILTER_FAIL)
546 {
35af9f61 547 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 548 more_errno,
35af9f61 549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
550 return FALSE;
551 }
552
553/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
554end the DATA. */
555
556if (*errno_value == ERRNO_CHHEADER_FAIL)
557 {
558 *message =
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
561 return FALSE;
562 }
563
564/* Handle failure to write a complete data block */
565
566if (*errno_value == ERRNO_WRITEINCOMPLETE)
567 {
568 *message = US string_sprintf("failed to write a data block");
569 return FALSE;
570 }
571
8c5d388a 572#ifdef SUPPORT_I18N
250b6871
JH
573/* Handle lack of advertised SMTPUTF8, for international message */
574if (*errno_value == ERRNO_UTF8_FWD)
575 {
d093f8e5 576 *message = US"utf8 support required but not offered for forwarding";
250b6871
JH
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
579 }
580#endif
581
0756eb3c
PH
582/* Handle error responses from the remote mailer. */
583
584if (buffer[0] != 0)
585 {
55414b25 586 const uschar *s = string_printing(buffer);
447d236c 587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 588 "%s", pl, smtp_command, s);
447d236c 589 *pass_message = TRUE;
0756eb3c
PH
590 *yield = buffer[0];
591 return TRUE;
592 }
593
594/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
595connection closed) case, which causes deferral. An explicit connection reset
596error has the same effect. Otherwise, put the host's identity in the message,
597leaving the errno value to be interpreted as well. In all cases, we have to
598assume the connection is now dead. */
0756eb3c 599
19b9dc85 600if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
601 {
602 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 603 *message = US string_sprintf("Remote host closed connection "
02b41d71 604 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
605 }
606else *message = US string_sprintf("%s [%s]", host->name, host->address);
607
608return FALSE;
609}
610
611
612
613/*************************************************
614* Write error message to logs *
615*************************************************/
616
617/* This writes to the main log and to the message log.
618
619Arguments:
620 addr the address item containing error information
621 host the current host
622
623Returns: nothing
624*/
625
626static void
627write_logs(address_item *addr, host_item *host)
628{
584ddd64
JH
629uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
c562fd30
JH
633
634if (addr->message)
0756eb3c 635 {
c562fd30 636 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
641 }
642else
643 {
37f3dc43
JH
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
647 }
648}
649
c562fd30
JH
650static void
651msglog_line(host_item * host, uschar * message)
652{
37f3dc43
JH
653deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
c562fd30
JH
655}
656
0756eb3c
PH
657
658
0cbf2b82 659#ifndef DISABLE_EVENT
d68218c7
JH
660/*************************************************
661* Post-defer action *
662*************************************************/
663
664/* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667Arguments:
d68218c7
JH
668 addr the address item containing error information
669 host the current host
670
671Returns: nothing
672*/
673
674static void
774ef2d7 675deferred_event_raise(address_item *addr, host_item *host)
d68218c7 676{
774ef2d7 677uschar * action = addr->transport->event_action;
55414b25 678const uschar * save_domain;
a7538db1
JH
679uschar * save_local;
680
d68218c7 681if (!action)
a7538db1 682 return;
d68218c7 683
a7538db1
JH
684save_domain = deliver_domain;
685save_local = deliver_localpart;
686
687/*XXX would ip & port already be set up? */
688deliver_host_address = string_copy(host->address);
774ef2d7
JH
689deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690event_defer_errno = addr->basic_errno;
d68218c7
JH
691
692router_name = addr->router->name;
693transport_name = addr->transport->name;
a7538db1
JH
694deliver_domain = addr->domain;
695deliver_localpart = addr->local_part;
696
774ef2d7 697(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706deliver_localpart = save_local;
707deliver_domain = save_domain;
d68218c7
JH
708router_name = transport_name = NULL;
709}
710#endif
711
0756eb3c
PH
712/*************************************************
713* Synchronize SMTP responses *
714*************************************************/
715
716/* This function is called from smtp_deliver() to receive SMTP responses from
717the server, and match them up with the commands to which they relate. When
718PIPELINING is not in use, this function is called after every command, and is
719therefore somewhat over-engineered, but it is simpler to use a single scheme
720that works both with and without PIPELINING instead of having two separate sets
721of code.
722
723The set of commands that are buffered up with pipelining may start with MAIL
724and may end with DATA; in between are RCPT commands that correspond to the
725addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726etc.) are never buffered.
727
728Errors after MAIL or DATA abort the whole process leaving the response in the
729buffer. After MAIL, pending responses are flushed, and the original command is
730re-instated in big_buffer for error messages. For RCPT commands, the remote is
731permitted to reject some recipient addresses while accepting others. However
732certain errors clearly abort the whole process. Set the value in
733transport_return to PENDING_OK if the address is accepted. If there is a
734subsequent general error, it will get reset accordingly. If not, it will get
735converted to OK at the end.
736
737Arguments:
48c7f9e2
PH
738 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
743 address_retry_
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
0756eb3c
PH
753
754Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
761*/
762
763static int
764sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
768 int buffsize)
769{
770address_item *addr = *sync_addr;
771int yield = 0;
772
773/* Handle the response for a MAIL command. On error, reinstate the original
774command in big_buffer for error message use, and flush any further pending
775responses before returning, except after I/O errors and timeouts. */
776
777if (pending_MAIL)
778 {
779 count--;
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
781 {
e027f545 782 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c
PH
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
785 {
786 uschar flushbuffer[4096];
e97957bc
PH
787 int save_errno = 0;
788 if (buffer[0] == '4')
789 {
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
792 }
0756eb3c
PH
793 while (count-- > 0)
794 {
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
796 '2', timeout)
797 && (errno != 0 || flushbuffer[0] == 0))
798 break;
799 }
e97957bc 800 errno = save_errno;
0756eb3c 801 }
c562fd30
JH
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
805 {
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
808 addr = addr->next;
809 }
0756eb3c
PH
810 return -3;
811 }
812 }
813
814if (pending_DATA) count--; /* Number of RCPT responses to come */
815
816/* Read and handle the required number of RCPT responses, matching each one up
817with an address by scanning for the next address whose status is PENDING_DEFER.
818*/
819
820while (count-- > 0)
821 {
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
823
824 /* The address was accepted */
c562fd30 825 addr->host_used = host;
0756eb3c
PH
826
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
828 {
829 yield |= 1;
830 addr->transport_return = PENDING_OK;
831
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
835
836 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
837 {
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
839 sender_address);
840 retry_add_item(addr, altkey, rf_delete);
0756eb3c 841 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 842 }
0756eb3c
PH
843 }
844
845 /* Timeout while reading the response */
846
847 else if (errno == ETIMEDOUT)
848 {
c562fd30
JH
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
895fbaf2 851 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 852 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 853 update_waiting = FALSE;
0756eb3c
PH
854 return -1;
855 }
856
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
860 makes sense. */
861
862 else if (errno != 0 || buffer[0] == 0)
863 {
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
866 return -2;
867 }
868
869 /* Handle SMTP permanent and temporary response codes. */
870
871 else
872 {
873 addr->message =
447d236c 874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
447d236c 877 setflag(addr, af_pass_message);
c562fd30 878 msglog_line(host, addr->message);
0756eb3c
PH
879
880 /* The response was 5xx */
881
882 if (buffer[0] == '5')
883 {
884 addr->transport_return = FAIL;
885 yield |= 2;
886 }
887
888 /* The response was 4xx */
889
890 else
891 {
0756eb3c
PH
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 895
0cbf2b82 896#ifndef DISABLE_EVENT
5ef5dd52
JB
897 event_defer_errno = addr->more_errno;
898 msg_event_raise(US"msg:rcpt:host:defer", addr);
899#endif
900
c562fd30
JH
901 /* Log temporary errors if there are more hosts to be tried.
902 If not, log this last one in the == line. */
0756eb3c 903
c562fd30
JH
904 if (host->next)
905 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 906
0cbf2b82 907#ifndef DISABLE_EVENT
5ef5dd52
JB
908 else
909 msg_event_raise(US"msg:rcpt:defer", addr);
910#endif
911
f6c332bd
PH
912 /* Do not put this message on the list of those waiting for specific
913 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 914
f6c332bd 915 update_waiting = FALSE;
0756eb3c 916
48c7f9e2
PH
917 /* Add a retry item for the address so that it doesn't get tried again
918 too soon. If address_retry_include_sender is true, add the sender address
919 to the retry key. */
0756eb3c 920
48c7f9e2
PH
921 if (address_retry_include_sender)
922 {
923 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
924 sender_address);
925 retry_add_item(addr, altkey, 0);
926 }
927 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
928 }
929 }
930 } /* Loop for next RCPT response */
931
932/* Update where to start at for the next block of responses, unless we
933have already handled all the addresses. */
934
935if (addr != NULL) *sync_addr = addr->next;
936
937/* Handle a response to DATA. If we have not had any good recipients, either
938previously or in this block, the response is ignored. */
939
940if (pending_DATA != 0 &&
941 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
942 {
943 int code;
944 uschar *msg;
447d236c 945 BOOL pass_message;
e97957bc
PH
946 if (pending_DATA > 0 || (yield & 1) != 0)
947 {
948 if (errno == 0 && buffer[0] == '4')
949 {
950 errno = ERRNO_DATA4XX;
951 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
952 }
953 return -3;
954 }
447d236c 955 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
956 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
957 "is in use and there were no good recipients\n", msg);
958 }
959
960/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
961present) received 3xx. If any RCPTs were handled and yielded anything other
962than 4xx, yield will be set non-zero. */
963
964return yield;
965}
966
967
968
fcc8e047
JH
969/* Do the client side of smtp-level authentication */
970/*
971Arguments:
972 buffer EHLO response from server (gets overwritten)
973 addrlist chain of potential addresses to deliver
974 host host to deliver to
975 ob transport options
976 ibp, obp comms channel control blocks
977
978Returns:
979 OK Success, or failed (but not required): global "smtp_authenticated" set
980 DEFER Failed authentication (and was required)
981 ERROR Internal problem
982
983 FAIL_SEND Failed communications - transmit
984 FAIL - response
985*/
986
987int
988smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
989 smtp_transport_options_block *ob, BOOL is_esmtp,
990 smtp_inblock *ibp, smtp_outblock *obp)
991{
a7538db1
JH
992int require_auth;
993uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 994
a7538db1
JH
995smtp_authenticated = FALSE;
996client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 997require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 998
a7538db1
JH
999if (is_esmtp && !regex_AUTH) regex_AUTH =
1000 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1001 FALSE, TRUE);
fcc8e047 1002
a7538db1
JH
1003if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1004 {
1005 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1006 expand_nmax = -1; /* reset */
fcc8e047 1007
a7538db1
JH
1008 /* Must not do this check until after we have saved the result of the
1009 regex match above. */
fcc8e047 1010
a7538db1 1011 if (require_auth == OK ||
5130845b 1012 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1013 {
1014 auth_instance *au;
1015 fail_reason = US"no common mechanisms were found";
fcc8e047 1016
a7538db1 1017 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1018
a7538db1
JH
1019 /* Scan the configured authenticators looking for one which is configured
1020 for use as a client, which is not suppressed by client_condition, and
1021 whose name matches an authentication mechanism supported by the server.
1022 If one is found, attempt to authenticate by calling its client function.
1023 */
fcc8e047 1024
a7538db1
JH
1025 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1026 {
1027 uschar *p = names;
1028 if (!au->client ||
1029 (au->client_condition != NULL &&
1030 !expand_check_condition(au->client_condition, au->name,
1031 US"client authenticator")))
1032 {
1033 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1034 au->name,
1035 (au->client)? "client_condition is false" :
1036 "not configured as a client");
1037 continue;
1038 }
fcc8e047 1039
a7538db1 1040 /* Loop to scan supported server mechanisms */
fcc8e047 1041
a7538db1
JH
1042 while (*p != 0)
1043 {
1044 int rc;
1045 int len = Ustrlen(au->public_name);
1046 while (isspace(*p)) p++;
fcc8e047 1047
a7538db1
JH
1048 if (strncmpic(au->public_name, p, len) != 0 ||
1049 (p[len] != 0 && !isspace(p[len])))
1050 {
1051 while (*p != 0 && !isspace(*p)) p++;
1052 continue;
1053 }
fcc8e047 1054
a7538db1
JH
1055 /* Found data for a listed mechanism. Call its client entry. Set
1056 a flag in the outblock so that data is overwritten after sending so
1057 that reflections don't show it. */
fcc8e047 1058
a7538db1
JH
1059 fail_reason = US"authentication attempt(s) failed";
1060 obp->authenticating = TRUE;
1061 rc = (au->info->clientcode)(au, ibp, obp,
1062 ob->command_timeout, buffer, bufsize);
1063 obp->authenticating = FALSE;
1064 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1065 au->name, rc);
fcc8e047 1066
a7538db1
JH
1067 /* A temporary authentication failure must hold up delivery to
1068 this host. After a permanent authentication failure, we carry on
1069 to try other authentication methods. If all fail hard, try to
1070 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1071
a7538db1
JH
1072 switch(rc)
1073 {
1074 case OK:
1075 smtp_authenticated = TRUE; /* stops the outer loop */
1076 client_authenticator = au->name;
1077 if (au->set_client_id != NULL)
1078 client_authenticated_id = expand_string(au->set_client_id);
1079 break;
1080
1081 /* Failure after writing a command */
1082
1083 case FAIL_SEND:
1084 return FAIL_SEND;
1085
1086 /* Failure after reading a response */
1087
1088 case FAIL:
1089 if (errno != 0 || buffer[0] != '5') return FAIL;
1090 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1091 au->name, host->name, host->address, buffer);
1092 break;
1093
1094 /* Failure by some other means. In effect, the authenticator
1095 decided it wasn't prepared to handle this case. Typically this
1096 is the result of "fail" in an expansion string. Do we need to
1097 log anything here? Feb 2006: a message is now put in the buffer
1098 if logging is required. */
1099
1100 case CANCELLED:
1101 if (*buffer != 0)
1102 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1103 "authentication H=%s [%s] %s", au->name, host->name,
1104 host->address, buffer);
1105 break;
1106
1107 /* Internal problem, message in buffer. */
1108
1109 case ERROR:
895fbaf2
JH
1110 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1111 DEFER, FALSE);
a7538db1
JH
1112 return ERROR;
1113 }
fcc8e047 1114
a7538db1
JH
1115 break; /* If not authenticated, try next authenticator */
1116 } /* Loop for scanning supported server mechanisms */
1117 } /* Loop for further authenticators */
fcc8e047 1118 }
a7538db1 1119 }
fcc8e047 1120
a7538db1 1121/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1122
a7538db1
JH
1123if (require_auth == OK && !smtp_authenticated)
1124 {
895fbaf2 1125 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1126 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1127 FALSE);
a7538db1
JH
1128 return DEFER;
1129 }
4d8d62b9 1130
a7538db1 1131return OK;
fcc8e047
JH
1132}
1133
1134
1135/* Construct AUTH appendix string for MAIL TO */
1136/*
1137Arguments
1138 buffer to build string
1139 addrlist chain of potential addresses to deliver
1140 ob transport options
1141
1142Globals smtp_authenticated
1143 client_authenticated_sender
1144Return True on error, otherwise buffer has (possibly empty) terminated string
1145*/
1146
1147BOOL
1148smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1149 smtp_transport_options_block *ob)
1150{
1151uschar *local_authenticated_sender = authenticated_sender;
1152
1153#ifdef notdef
1154 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1155#endif
1156
1157if (ob->authenticated_sender != NULL)
1158 {
1159 uschar *new = expand_string(ob->authenticated_sender);
1160 if (new == NULL)
1161 {
1162 if (!expand_string_forcedfail)
1163 {
1164 uschar *message = string_sprintf("failed to expand "
1165 "authenticated_sender: %s", expand_string_message);
895fbaf2 1166 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1167 return TRUE;
1168 }
1169 }
1170 else if (new[0] != 0) local_authenticated_sender = new;
1171 }
1172
1173/* Add the authenticated sender address if present */
1174
1175if ((smtp_authenticated || ob->authenticated_sender_force) &&
1176 local_authenticated_sender != NULL)
1177 {
1178 string_format(buffer, bufsize, " AUTH=%s",
1179 auth_xtextencode(local_authenticated_sender,
1180 Ustrlen(local_authenticated_sender)));
1181 client_authenticated_sender = string_copy(local_authenticated_sender);
1182 }
1183else
1184 *buffer= 0;
1185
1186return FALSE;
1187}
1188
1189
1190
0e66b3b6 1191#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1192/* Lookup TLSA record for host/port.
1193Return: OK success with dnssec; DANE mode
1194 DEFER Do not use this host now, may retry later
1195 FAIL_FORCED No TLSA record; DANE not usable
1196 FAIL Do not use this connection
1197*/
1198
0e66b3b6 1199int
4b0fe319 1200tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1201{
1202/* move this out to host.c given the similarity to dns_lookup() ? */
1203uschar buffer[300];
55414b25 1204const uschar * fullname = buffer;
0e66b3b6
JH
1205
1206/* TLSA lookup string */
1207(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1208
1209switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1210 {
0e66b3b6
JH
1211 case DNS_SUCCEED:
1212 if (!dns_is_secure(dnsa))
1213 {
1214 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1215 return DEFER;
1216 }
4b0fe319 1217 return OK;
2d5fdd53
JH
1218
1219 case DNS_AGAIN:
1220 return DEFER; /* just defer this TLS'd conn */
1221
ef3a1a30
JH
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
2d5fdd53
JH
1224 return dane_required ? FAIL : FAIL_FORCED;
1225
1226 default:
1227 case DNS_FAIL:
1228 return dane_required ? FAIL : DEFER;
0e66b3b6 1229 }
0e66b3b6
JH
1230}
1231#endif
1232
1233
a39bd74d
JB
1234
1235typedef struct smtp_compare_s
1236{
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1239} smtp_compare_t;
1240
d093f8e5
JH
1241
1242/* Create a unique string that identifies this message, it is based on
1243sender_address, helo_data and tls_certificate if enabled.
1244*/
a39bd74d
JB
1245
1246static uschar *
1247smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1248{
1249address_item * addr1;
1250uschar * if1 = US"";
1251uschar * helo1 = US"";
1252#ifdef SUPPORT_TLS
1253uschar * tlsc1 = US"";
1254#endif
1255uschar * save_sender_address = sender_address;
1256uschar * local_identity = NULL;
1257smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1259
1260sender_address = sender;
1261
1262addr1 = deliver_make_addr (sender, TRUE);
1263deliver_set_expansions(addr1);
1264
1265if (ob->interface)
1266 if1 = expand_string(ob->interface);
1267
1268if (ob->helo_data)
1269 helo1 = expand_string(ob->helo_data);
1270
1271#ifdef SUPPORT_TLS
1272if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1275#else
1276local_identity = string_sprintf ("%s^%s", if1, helo1);
1277#endif
1278
1279deliver_set_expansions(NULL);
1280sender_address = save_sender_address;
1281
1282return local_identity;
1283}
1284
1285
1286
1287/* This routine is a callback that is called from transport_check_waiting.
1288This function will evaluate the incoming message versus the previous
1289message. If the incoming message is using a different local identity then
1290we will veto this new message. */
1291
1292static BOOL
1293smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1294{
dadff1d4
HSHR
1295uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1298
1299current_local_identity =
a39bd74d 1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1301
dadff1d4
HSHR
1302if (!(new_sender_address = deliver_get_sender_address(message_id)))
1303 return 0;
1304
1305message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1307
1308return Ustrcmp(current_local_identity, message_local_identity) == 0;
1309}
1310
1311
1312
9094b84b
JH
1313uschar
1314ehlo_response(uschar * buf, size_t bsize, uschar checks)
1315{
1316#ifdef SUPPORT_TLS
ff5aac2b
JH
1317if ( checks & PEER_OFFERED_TLS
1318 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_TLS;
9094b84b
JH
1320#endif
1321
ff5aac2b
JH
1322if ( checks & PEER_OFFERED_IGNQ
1323 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1324 PCRE_EOPT, NULL, 0) < 0)
1325 checks &= ~PEER_OFFERED_IGNQ;
9094b84b 1326
f98442df
JH
1327if ( checks & PEER_OFFERED_CHUNKING
1328 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_CHUNKING;
1330
9094b84b 1331#ifndef DISABLE_PRDR
ff5aac2b
JH
1332if ( checks & PEER_OFFERED_PRDR
1333 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PRDR;
9094b84b
JH
1335#endif
1336
1337#ifdef SUPPORT_I18N
ff5aac2b
JH
1338if ( checks & PEER_OFFERED_UTF8
1339 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_UTF8;
9094b84b
JH
1341#endif
1342
ff5aac2b
JH
1343if ( checks & PEER_OFFERED_DSN
1344 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~PEER_OFFERED_DSN;
9094b84b 1346
ff5aac2b
JH
1347if ( checks & PEER_OFFERED_PIPE
1348 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1349 PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~PEER_OFFERED_PIPE;
9094b84b 1351
ff5aac2b
JH
1352if ( checks & PEER_OFFERED_SIZE
1353 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_SIZE;
9094b84b
JH
1355
1356return checks;
1357}
1358
1359
6d5c916c
JH
1360
1361/* Callback for emitting a BDAT data chunk header.
6d5c916c 1362
e027f545
JH
1363If given a nonzero size, first flush any buffered SMTP commands
1364then emit the command.
1365
1366Reap previous SMTP command responses if requested.
1367Reap one SMTP command response if requested.
6d5c916c
JH
1368
1369Returns: OK or ERROR
1370*/
1371
1372static int
1373smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
e027f545 1374 unsigned chunk_size, unsigned flags)
6d5c916c
JH
1375{
1376smtp_transport_options_block * ob =
1377 (smtp_transport_options_block *)(tctx->tblock->options_block);
e027f545
JH
1378int cmd_count = 0;
1379int prev_cmd_count;
1380uschar * buffer = tctx->buffer;
6d5c916c 1381
6d5c916c 1382
e027f545 1383/* Write SMTP chunk header command */
6d5c916c 1384
e027f545 1385if (chunk_size > 0)
87cb4a16 1386 {
e027f545
JH
1387 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1388 chunk_size,
1389 flags & tc_chunk_last ? " LAST" : "")
1390 ) < 0) return ERROR;
87cb4a16
JH
1391 if (flags & tc_chunk_last)
1392 data_command = string_copy(big_buffer); /* Save for later error message */
1393 }
e027f545
JH
1394
1395prev_cmd_count = cmd_count += tctx->cmd_count;
6d5c916c 1396
e027f545 1397/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1398
e027f545
JH
1399if (chunk_size > 0)
1400 prev_cmd_count--;
1401if (tctx->pending_BDAT)
1402 prev_cmd_count--;
6d5c916c 1403
e027f545 1404if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1405 {
58fc5fb2
JH
1406 DEBUG(D_transport) debug_printf("look for %d responses"
1407 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1408
e027f545
JH
1409 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1410 tctx->sync_addr, tctx->host, prev_cmd_count,
1411 ob->address_retry_include_sender,
1412 tctx->pending_MAIL, 0,
1413 tctx->inblock,
1414 ob->command_timeout,
2d14f397 1415 buffer, DELIVER_BUFFER_SIZE))
e027f545
JH
1416 {
1417 case 1: /* 2xx (only) => OK */
1418 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1419 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1420 case 0: break; /* No 2xx or 5xx, but no probs */
1421
1422 case -1: /* Timeout on RCPT */
1423 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1424 }
1425 cmd_count = 1;
1426 if (!tctx->pending_BDAT)
1427 pipelining_active = FALSE;
6d5c916c 1428 }
e027f545 1429
58fc5fb2 1430/* Reap response for an outstanding BDAT */
e027f545 1431
58fc5fb2 1432if (tctx->pending_BDAT)
e027f545 1433 {
58fc5fb2
JH
1434 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1435
2d14f397 1436 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
e027f545
JH
1437 ob->command_timeout))
1438 {
1439 if (errno == 0 && buffer[0] == '4')
1440 {
1441 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1442 tctx->first_addr->more_errno |=
1443 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1444 }
1445 return ERROR;
1446 }
1447 cmd_count--;
1448 tctx->pending_BDAT = FALSE;
1449 pipelining_active = FALSE;
1450 }
1451else if (chunk_size > 0)
1452 tctx->pending_BDAT = TRUE;
1453
1454
1455tctx->cmd_count = cmd_count;
1456return OK;
6d5c916c
JH
1457}
1458
1459
1460
0756eb3c 1461/*************************************************
d093f8e5 1462* Make connection for given message *
0756eb3c
PH
1463*************************************************/
1464
d093f8e5
JH
1465/*
1466Arguments:
1467 ctx connection context
d093f8e5
JH
1468 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1469 a second attempt after TLS initialization fails
1470 verify TRUE if connection is for a verify callout, FALSE for
1471 a delivery attempt
1472
1473Returns: OK - the connection was made and the delivery attempted;
1474 fd is set in the conn context, tls_out set up.
1475 DEFER - the connection could not be made, or something failed
1476 while setting up the SMTP session, or there was a
1477 non-message-specific error, such as a timeout.
1478 ERROR - helo_data or add_headers or authenticated_sender is
1479 specified for this transport, and the string failed
1480 to expand
1481*/
1482int
02b41d71 1483smtp_setup_conn(smtp_context * sx, BOOL suppress_tls, BOOL verify)
d093f8e5
JH
1484{
1485#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1486dns_answer tlsa_dnsa;
1487#endif
1488BOOL pass_message = FALSE;
1489
1490uschar * message = NULL;
1491int save_errno;
1492int yield = OK;
1493int rc;
1494
02b41d71 1495sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
d093f8e5
JH
1496
1497sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1498sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1499sx->ok = FALSE;
1500sx->send_rset = TRUE;
1501sx->send_quit = TRUE;
1502sx->setting_up = TRUE;
1503sx->esmtp = TRUE;
1504sx->esmtp_sent = FALSE;
59a286ef 1505#ifdef SUPPORT_I18N
d093f8e5 1506sx->utf8_needed = FALSE;
59a286ef 1507#endif
d093f8e5 1508sx->dsn_all_lasthop = TRUE;
59a286ef 1509#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
d093f8e5
JH
1510sx->dane = FALSE;
1511sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1512#endif
1513
1514if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
d093f8e5
JH
1515sx->peer_offered = 0;
1516sx->igquotstr = US"";
02b41d71 1517if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
d093f8e5
JH
1518#ifdef EXPERIMENTAL_DSN_INFO
1519sx->smtp_greeting = NULL;
1520sx->helo_response = NULL;
59a286ef
JH
1521#endif
1522
0756eb3c 1523smtp_command = US"initial connection";
d093f8e5 1524sx->buffer[0] = '\0';
0756eb3c
PH
1525
1526/* Set up the buffer for reading SMTP response packets. */
1527
d093f8e5
JH
1528sx->inblock.buffer = sx->inbuffer;
1529sx->inblock.buffersize = sizeof(sx->inbuffer);
1530sx->inblock.ptr = sx->inbuffer;
1531sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1532
1533/* Set up the buffer for holding SMTP commands while pipelining */
1534
d093f8e5
JH
1535sx->outblock.buffer = sx->outbuffer;
1536sx->outblock.buffersize = sizeof(sx->outbuffer);
1537sx->outblock.ptr = sx->outbuffer;
1538sx->outblock.cmd_count = 0;
1539sx->outblock.authenticating = FALSE;
0756eb3c 1540
6c512171
PH
1541/* Reset the parameters of a TLS session. */
1542
817d9f57
JH
1543tls_out.bits = 0;
1544tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1545tls_out.ourcert = NULL;
1546tls_out.peercert = NULL;
817d9f57
JH
1547tls_out.peerdn = NULL;
1548#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1549tls_out.sni = NULL;
5b456975 1550#endif
018058b2 1551tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1552
35aba663
JH
1553/* Flip the legacy TLS-related variables over to the outbound set in case
1554they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1555afterward (when being used by a transport) as we're in a subprocess.
1556For verify, unflipped once the callout is dealt with */
35aba663
JH
1557
1558tls_modify_variables(&tls_out);
1559
061b7ebd 1560#ifndef SUPPORT_TLS
d093f8e5 1561if (sx->smtps)
061b7ebd 1562 {
d093f8e5 1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
895fbaf2 1564 DEFER, FALSE);
018058b2 1565 return ERROR;
061b7ebd
PP
1566 }
1567#endif
1568
0756eb3c
PH
1569/* Make a connection to the host if this isn't a continued delivery, and handle
1570the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571specially so they can be identified for retries. */
1572
1573if (continue_hostname == NULL)
1574 {
02b41d71
JH
1575 if (verify)
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1577
a7538db1 1578 /* This puts port into host->port */
d093f8e5
JH
1579 sx->inblock.sock = sx->outblock.sock =
1580 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1581 sx->ob->connect_timeout, sx->tblock);
4311097e 1582
d093f8e5 1583 if (sx->inblock.sock < 0)
0756eb3c 1584 {
02b41d71
JH
1585 uschar * msg = NULL;
1586 int save_errno = errno;
1587 if (verify)
1588 {
1589 msg = strerror(errno);
1590 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1591 }
1592 set_errno_nohost(sx->addrlist,
1593 save_errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : save_errno,
1594 verify ? string_sprintf("could not connect: %s", msg)
1595 : NULL,
1596 DEFER, FALSE);
1597 sx->send_quit = FALSE;
0756eb3c
PH
1598 return DEFER;
1599 }
1600
0e66b3b6
JH
1601#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1602 {
0e66b3b6
JH
1603 tls_out.dane_verified = FALSE;
1604 tls_out.tlsa_usage = 0;
1605
d093f8e5 1606 if (sx->host->dnssec == DS_YES)
0e66b3b6 1607 {
d093f8e5
JH
1608 if( sx->dane_required
1609 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
0e66b3b6 1610 )
d093f8e5 1611 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
4b0fe319 1612 {
d093f8e5 1613 case OK: sx->dane = TRUE; break;
2d5fdd53 1614 case FAIL_FORCED: break;
d093f8e5 1615 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53
JH
1616 string_sprintf("DANE error: tlsa lookup %s",
1617 rc == DEFER ? "DEFER" : "FAIL"),
1618 rc, FALSE);
1619 return rc;
4b0fe319 1620 }
0e66b3b6 1621 }
d093f8e5 1622 else if (sx->dane_required)
0e66b3b6 1623 {
d093f8e5
JH
1624 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1625 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
895fbaf2 1626 FAIL, FALSE);
4b0fe319 1627 return FAIL;
0e66b3b6
JH
1628 }
1629
d093f8e5
JH
1630 if (sx->dane)
1631 sx->ob->tls_tempfail_tryclear = FALSE;
0e66b3b6
JH
1632 }
1633#endif /*DANE*/
1634
41c7c167
PH
1635 /* Expand the greeting message while waiting for the initial response. (Makes
1636 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1637 delayed till here so that $sending_interface and $sending_port are set. */
1638
02b41d71
JH
1639 if (sx->helo_data)
1640 if (!(sx->helo_data = expand_string(sx->helo_data)))
1641 if (verify)
1642 log_write(0, LOG_MAIN|LOG_PANIC,
1643 "<%s>: failed to expand transport's helo_data value for callout: %s",
1644 sx->addrlist->address, expand_string_message);
1645
8c5d388a 1646#ifdef SUPPORT_I18N
d093f8e5 1647 if (sx->helo_data)
810d16ad 1648 {
02b41d71
JH
1649 expand_string_message = NULL;
1650 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1651 &expand_string_message)),
1652 expand_string_message)
1653 if (verify)
1654 log_write(0, LOG_MAIN|LOG_PANIC,
1655 "<%s>: failed to expand transport's helo_data value for callout: %s",
1656 sx->addrlist->address, expand_string_message);
1657 else
1658 sx->helo_data = NULL;
810d16ad
JH
1659 }
1660#endif
41c7c167 1661
0756eb3c
PH
1662 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1663 is nevertheless a reasonably clean way of programming this kind of logic,
1664 where you want to escape on any error. */
1665
d093f8e5 1666 if (!sx->smtps)
061b7ebd 1667 {
8d330698
JH
1668 BOOL good_response;
1669
1670#ifdef TCP_QUICKACK
d093f8e5 1671 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
8d330698 1672#endif
d093f8e5
JH
1673 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1674 '2', sx->ob->command_timeout);
895fbaf2 1675#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1676 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1677#endif
1678 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1679
0cbf2b82 1680#ifndef DISABLE_EVENT
b30275b8 1681 {
805c9d53 1682 uschar * s;
d093f8e5
JH
1683 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1684 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1685 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 1686 if (s)
a7538db1 1687 {
d093f8e5 1688 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 1689 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1690 DEFER, FALSE);
a7538db1
JH
1691 yield = DEFER;
1692 goto SEND_QUIT;
1693 }
b30275b8 1694 }
a7538db1
JH
1695#endif
1696
061b7ebd
PP
1697 /* Now check if the helo_data expansion went well, and sign off cleanly if
1698 it didn't. */
41c7c167 1699
d093f8e5 1700 if (!sx->helo_data)
061b7ebd 1701 {
d093f8e5 1702 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 1703 expand_string_message);
d093f8e5 1704 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1705 yield = DEFER;
1706 goto SEND_QUIT;
1707 }
41c7c167
PH
1708 }
1709
0756eb3c 1710/** Debugging without sending a message
d093f8e5 1711sx->addrlist->transport_return = DEFER;
0756eb3c
PH
1712goto SEND_QUIT;
1713**/
1714
1715 /* Errors that occur after this point follow an SMTP command, which is
1716 left in big_buffer by smtp_write_command() for use in error messages. */
1717
1718 smtp_command = big_buffer;
1719
1720 /* Tell the remote who we are...
1721
1722 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1723 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1724 greeting is of this form. The assumption was that the far end supports it
1725 properly... but experience shows that there are some that give 5xx responses,
1726 even though the banner includes "ESMTP" (there's a bloody-minded one that
1727 says "ESMTP not spoken here"). Cope with that case.
1728
1729 September 2000: Time has passed, and it seems reasonable now to always send
1730 EHLO at the start. It is also convenient to make the change while installing
1731 the TLS stuff.
1732
1733 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1734 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1735 would be no way to send out the mails, so there is now a host list
1736 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1737 PIPELINING problem as well. Maybe it can also be useful to cure other
1738 problems with broken servers.
1739
1740 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1741 Then somebody tried it with a Microsoft mailer... It seems that all other
1742 mailers use upper case for some reason (the RFC is quite clear about case
1743 independence) so, for peace of mind, I gave in. */
1744
d093f8e5 1745 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
0756eb3c 1746
061b7ebd
PP
1747 /* Alas; be careful, since this goto is not an error-out, so conceivably
1748 we might set data between here and the target which we assume to exist
1749 and be usable. I can see this coming back to bite us. */
a7538db1 1750#ifdef SUPPORT_TLS
d093f8e5 1751 if (sx->smtps)
061b7ebd 1752 {
2d14f397 1753 smtp_peer_options |= PEER_OFFERED_TLS;
061b7ebd 1754 suppress_tls = FALSE;
d093f8e5 1755 sx->ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
1756 smtp_command = US"SSL-on-connect";
1757 goto TLS_NEGOTIATE;
1758 }
a7538db1 1759#endif
061b7ebd 1760
d093f8e5 1761 if (sx->esmtp)
0756eb3c 1762 {
d093f8e5
JH
1763 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1764 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 1765 goto SEND_FAILED;
d093f8e5
JH
1766 sx->esmtp_sent = TRUE;
1767 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1768 sx->ob->command_timeout))
0756eb3c 1769 {
d093f8e5 1770 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
895fbaf2
JH
1771 {
1772#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1773 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1774#endif
1775 goto RESPONSE_FAILED;
1776 }
d093f8e5 1777 sx->esmtp = FALSE;
0756eb3c 1778 }
895fbaf2 1779#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1780 sx->helo_response = string_copy(sx->buffer);
895fbaf2 1781#endif
0756eb3c
PH
1782 }
1783 else
0756eb3c
PH
1784 DEBUG(D_transport)
1785 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 1786
d093f8e5 1787 if (!sx->esmtp)
0756eb3c 1788 {
895fbaf2 1789 BOOL good_response;
d093f8e5
JH
1790 int n = sizeof(sx->buffer);
1791 uschar * rsp = sx->buffer;
a57ce043 1792
d093f8e5
JH
1793 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1794 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 1795
d093f8e5 1796 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
0756eb3c 1797 goto SEND_FAILED;
d093f8e5
JH
1798 good_response = smtp_read_response(&sx->inblock, rsp, n,
1799 '2', sx->ob->command_timeout);
895fbaf2 1800#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1801 sx->helo_response = string_copy(rsp);
895fbaf2 1802#endif
a57ce043
JH
1803 if (!good_response)
1804 {
1805 /* Handle special logging for a closed connection after HELO
1806 when had previously sent EHLO */
1807
d093f8e5 1808 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
a57ce043 1809 {
d093f8e5 1810 sx->send_quit = FALSE;
a57ce043
JH
1811 save_errno = ERRNO_SMTPCLOSED;
1812 message = string_sprintf("Remote host closed connection "
1813 "in response to %s (EHLO response was: %s)",
d093f8e5 1814 smtp_command, sx->buffer);
a57ce043
JH
1815 goto FAILED;
1816 }
d093f8e5 1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
a57ce043
JH
1818 goto RESPONSE_FAILED;
1819 }
0756eb3c
PH
1820 }
1821
d093f8e5 1822 sx->peer_offered = smtp_peer_options = 0;
2d14f397 1823
d093f8e5 1824 if (sx->esmtp || sx->lmtp)
2d14f397 1825 {
d093f8e5 1826 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
ff5aac2b 1827 PEER_OFFERED_TLS /* others checked later */
9094b84b 1828 );
f1513293 1829
0756eb3c
PH
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1831
a7538db1 1832#ifdef SUPPORT_TLS
d093f8e5 1833 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
7ade712c 1834#endif
2d14f397 1835 }
0756eb3c
PH
1836 }
1837
1838/* For continuing deliveries down the same channel, the socket is the standard
1839input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1840below). Set up the pointer to where subsequent commands will be left, for
2d14f397 1841error messages. Note that smtp_peer_options will have been
0756eb3c
PH
1842set from the command line if they were set in the process that passed the
1843connection on. */
1844
895fbaf2 1845/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 1846as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
1847It does not wait. Unclear how we keep separate host's responses
1848separate - we could match up by host ip+port as a bodge. */
1849
0756eb3c
PH
1850else
1851 {
d093f8e5 1852 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
0756eb3c 1853 smtp_command = big_buffer;
d093f8e5 1854 sx->host->port = sx->port; /* Record the port that was used */
02b41d71 1855 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
0756eb3c
PH
1856 }
1857
1858/* If TLS is available on this connection, whether continued or not, attempt to
1859start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1860send another EHLO - the server may give a different answer in secure mode. We
1861use a separate buffer for reading the response to STARTTLS so that if it is
1862negative, the original EHLO data is available for subsequent analysis, should
1863the client not be required to use TLS. If the response is bad, copy the buffer
1864for error analysis. */
1865
1866#ifdef SUPPORT_TLS
2d14f397 1867if ( smtp_peer_options & PEER_OFFERED_TLS
5130845b 1868 && !suppress_tls
02b41d71
JH
1869 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1870 && ( !verify
1871 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1872 ) )
0756eb3c
PH
1873 {
1874 uschar buffer2[4096];
d093f8e5 1875 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
0756eb3c
PH
1876 goto SEND_FAILED;
1877
1878 /* If there is an I/O error, transmission of this message is deferred. If
1879 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1880 false, we also defer. However, if there is a temporary rejection of STARTTLS
1881 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1882 STARTTLS, we carry on. This means we will try to send the message in clear,
1883 unless the host is in hosts_require_tls (tested below). */
1884
d093f8e5
JH
1885 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1886 sx->ob->command_timeout))
0756eb3c 1887 {
4b0fe319
JH
1888 if ( errno != 0
1889 || buffer2[0] == 0
d093f8e5 1890 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
4b0fe319 1891 )
0dda4340 1892 {
d093f8e5 1893 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
0756eb3c 1894 goto RESPONSE_FAILED;
0dda4340 1895 }
0756eb3c
PH
1896 }
1897
1898 /* STARTTLS accepted: try to negotiate a TLS session. */
1899
1900 else
061b7ebd 1901 TLS_NEGOTIATE:
0756eb3c 1902 {
d093f8e5
JH
1903 address_item * addr;
1904 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
0e66b3b6 1905# ifdef EXPERIMENTAL_DANE
d093f8e5 1906 , sx->dane ? &tlsa_dnsa : NULL
0e66b3b6
JH
1907# endif
1908 );
0756eb3c
PH
1909
1910 /* TLS negotiation failed; give an error. From outside, this function may
1911 be called again to try in clear on a new connection, if the options permit
1912 it for this host. */
1913
1914 if (rc != OK)
1915 {
6ebd79ec 1916# ifdef EXPERIMENTAL_DANE
d093f8e5 1917 if (sx->dane) log_write(0, LOG_MAIN,
4b0fe319 1918 "DANE attempt failed; no TLS connection to %s [%s]",
d093f8e5 1919 sx->host->name, sx->host->address);
6ebd79ec
JH
1920# endif
1921
0756eb3c
PH
1922 save_errno = ERRNO_TLSFAILURE;
1923 message = US"failure while setting up TLS session";
d093f8e5 1924 sx->send_quit = FALSE;
0756eb3c
PH
1925 goto TLS_FAILED;
1926 }
1927
1928 /* TLS session is set up */
1929
2d14f397 1930 smtp_peer_options_wrap = smtp_peer_options;
d093f8e5 1931 for (addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1932 if (addr->transport_return == PENDING_DEFER)
1933 {
817d9f57 1934 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1935 addr->ourcert = tls_out.ourcert;
1936 addr->peercert = tls_out.peercert;
817d9f57 1937 addr->peerdn = tls_out.peerdn;
018058b2 1938 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1939 }
0756eb3c
PH
1940 }
1941 }
1942
061b7ebd
PP
1943/* if smtps, we'll have smtp_command set to something else; always safe to
1944reset it here. */
1945smtp_command = big_buffer;
1946
41c7c167
PH
1947/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1948helo_data is null, we are dealing with a connection that was passed from
1949another process, and so we won't have expanded helo_data above. We have to
1950expand it here. $sending_ip_address and $sending_port are set up right at the
1951start of the Exim process (in exim.c). */
0756eb3c 1952
817d9f57 1953if (tls_out.active >= 0)
0756eb3c 1954 {
061b7ebd 1955 char *greeting_cmd;
895fbaf2
JH
1956 BOOL good_response;
1957
d093f8e5 1958 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
41c7c167 1959 {
d093f8e5
JH
1960 uschar *message = string_sprintf("failed to expand helo_data: %s",
1961 expand_string_message);
1962 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1963 yield = DEFER;
1964 goto SEND_QUIT;
41c7c167
PH
1965 }
1966
0d0e4455 1967 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 1968 if (sx->smtps)
061b7ebd 1969 {
d093f8e5
JH
1970 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1971 '2', sx->ob->command_timeout);
895fbaf2 1972#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1973 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1974#endif
1975 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
1976 }
1977
d093f8e5 1978 if (sx->esmtp)
0d0e4455
PP
1979 greeting_cmd = "EHLO";
1980 else
1981 {
1982 greeting_cmd = "HELO";
1983 DEBUG(D_transport)
1984 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1985 }
1986
d093f8e5
JH
1987 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1988 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
0756eb3c 1989 goto SEND_FAILED;
d093f8e5
JH
1990 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1991 '2', sx->ob->command_timeout);
895fbaf2 1992#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1993 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1994#endif
1995 if (!good_response) goto RESPONSE_FAILED;
2d14f397 1996 smtp_peer_options = 0;
0756eb3c
PH
1997 }
1998
1999/* If the host is required to use a secure channel, ensure that we
2000have one. */
2001
d093f8e5 2002else if ( sx->smtps
0e66b3b6 2003# ifdef EXPERIMENTAL_DANE
d093f8e5 2004 || sx->dane
0e66b3b6 2005# endif
d093f8e5 2006 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
7a31d643 2007 )
0756eb3c
PH
2008 {
2009 save_errno = ERRNO_TLSREQUIRED;
c562fd30 2010 message = string_sprintf("a TLS session is required, but %s",
2d14f397
JH
2011 smtp_peer_options & PEER_OFFERED_TLS
2012 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
0756eb3c
PH
2013 goto TLS_FAILED;
2014 }
0e66b3b6 2015#endif /*SUPPORT_TLS*/
0756eb3c
PH
2016
2017/* If TLS is active, we have just started it up and re-done the EHLO command,
2018so its response needs to be analyzed. If TLS is not active and this is a
2019continued session down a previously-used socket, we haven't just done EHLO, so
2020we skip this. */
2021
2022if (continue_hostname == NULL
a7538db1 2023#ifdef SUPPORT_TLS
817d9f57 2024 || tls_out.active >= 0
a7538db1 2025#endif
0756eb3c
PH
2026 )
2027 {
d093f8e5 2028 if (sx->esmtp || sx->lmtp)
2d14f397 2029 {
d093f8e5
JH
2030 sx->peer_offered = ehlo_response(sx->buffer, Ustrlen(sx->buffer),
2031 0 /* no TLS */
2032 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2033 | PEER_OFFERED_CHUNKING
2034 | PEER_OFFERED_PRDR
9094b84b 2035#ifdef SUPPORT_I18N
d093f8e5
JH
2036 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2037 /*XXX if we hand peercaps on to continued-conn processes,
2038 must not depend on this addr */
9094b84b 2039#endif
d093f8e5
JH
2040 | PEER_OFFERED_DSN
2041 | PEER_OFFERED_PIPE
2042 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
9094b84b
JH
2043 );
2044
2d14f397
JH
2045 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2046 lmtp_ignore_quota option was set. */
f1513293 2047
d093f8e5 2048 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2049
2d14f397
JH
2050 /* If the response to EHLO specified support for the SIZE parameter, note
2051 this, provided size_addition is non-negative. */
f1513293 2052
d093f8e5 2053 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
0756eb3c 2054
2d14f397
JH
2055 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2056 the current host, esmtp will be false, so PIPELINING can never be used. If
2057 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2058
d093f8e5
JH
2059 if ( sx->peer_offered & PEER_OFFERED_PIPE
2060 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2d14f397 2061 smtp_peer_options |= PEER_OFFERED_PIPE;
0756eb3c 2062
2d14f397
JH
2063 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2064 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
0756eb3c 2065
d093f8e5
JH
2066 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2067 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2068 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
f98442df 2069
d093f8e5 2070 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2d14f397 2071 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
0756eb3c 2072
8ccd00b1 2073#ifndef DISABLE_PRDR
d093f8e5
JH
2074 if ( sx->peer_offered & PEER_OFFERED_PRDR
2075 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2076 sx->peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 2077
d093f8e5 2078 if (sx->peer_offered & PEER_OFFERED_PRDR)
2d14f397 2079 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
fd98a5c6
JH
2080#endif
2081
2d14f397 2082 /* Note if the server supports DSN */
d093f8e5 2083 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2d14f397 2084 DEBUG(D_transport) debug_printf("%susing DSN\n",
d093f8e5 2085 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
6c1c3d1d 2086
2d14f397
JH
2087 /* Note if the response to EHLO specifies support for the AUTH extension.
2088 If it has, check that this host is one we want to authenticate to, and do
2089 the business. The host name and address must be available when the
2090 authenticator's client driver is running. */
0756eb3c 2091
d093f8e5
JH
2092 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2093 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2d14f397
JH
2094 {
2095 default: goto SEND_QUIT;
2096 case OK: break;
2097 case FAIL_SEND: goto SEND_FAILED;
2098 case FAIL: goto RESPONSE_FAILED;
2099 }
0756eb3c
PH
2100 }
2101 }
2d14f397 2102pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
0756eb3c
PH
2103
2104/* The setting up of the SMTP call is now complete. Any subsequent errors are
2105message-specific. */
2106
d093f8e5 2107sx->setting_up = FALSE;
0756eb3c 2108
8c5d388a 2109#ifdef SUPPORT_I18N
d093f8e5 2110if (sx->addrlist->prop.utf8_msg)
9094b84b 2111 {
d093f8e5
JH
2112 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2113 && !sx->addrlist->prop.utf8_downcvt_maybe;
2114 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2115 debug_printf("utf8: %s downconvert\n",
d093f8e5 2116 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2117 }
2118
7ade712c 2119/* If this is an international message we need the host to speak SMTPUTF8 */
d093f8e5 2120if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH
2121 {
2122 errno = ERRNO_UTF8_FWD;
2123 goto RESPONSE_FAILED;
2124 }
2125#endif
2126
d093f8e5
JH
2127return OK;
2128
2129
2130 {
2131 int code;
2132 uschar * set_message;
2133
2134 RESPONSE_FAILED:
2135 {
2136 save_errno = errno;
2137 message = NULL;
2138 sx->send_quit = check_response(sx->host, &save_errno, sx->addrlist->more_errno,
2139 sx->buffer, &code, &message, &pass_message);
2140 goto FAILED;
2141 }
2142
2143 SEND_FAILED:
2144 {
2145 save_errno = errno;
2146 code = '4';
2147 message = US string_sprintf("send() to %s [%s] failed: %s",
2148 sx->host->name, sx->host->address, strerror(save_errno));
2149 sx->send_quit = FALSE;
2150 goto FAILED;
2151 }
2152
2153 /* This label is jumped to directly when a TLS negotiation has failed,
2154 or was not done for a host for which it is required. Values will be set
2155 in message and save_errno, and setting_up will always be true. Treat as
2156 a temporary error. */
2157
2158#ifdef SUPPORT_TLS
2159 TLS_FAILED:
2160 code = '4';
2161#endif
2162
2163 /* The failure happened while setting up the call; see if the failure was
2164 a 5xx response (this will either be on connection, or following HELO - a 5xx
2165 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2166 never going to accept them. For other errors during setting up (timeouts or
2167 whatever), defer all addresses, and yield DEFER, so that the host is not
2168 tried again for a while. */
2169
2170 FAILED:
2171 sx->ok = FALSE; /* For when reached by GOTO */
2172 set_message = message;
2173
2174 yield = code == '5'
2175#ifdef SUPPORT_I18N
2176 || errno == ERRNO_UTF8_FWD
2177#endif
2178 ? FAIL : DEFER;
2179
2180 set_errno(sx->addrlist, save_errno, set_message, yield, pass_message, sx->host
2181#ifdef EXPERIMENTAL_DSN_INFO
2182 , sx->smtp_greeting, sx->helo_response
2183#endif
2184 );
2185 }
2186
2187
2188SEND_QUIT:
2189
2190if (sx->send_quit)
2191 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2192
d093f8e5
JH
2193#ifdef SUPPORT_TLS
2194tls_close(FALSE, TRUE);
2195#endif
2196
2197/* Close the socket, and return the appropriate value, first setting
2198works because the NULL setting is passed back to the calling process, and
2199remote_max_parallel is forced to 1 when delivering over an existing connection,
2200
2201If all went well and continue_more is set, we shouldn't actually get here if
2202there are further addresses, as the return above will be taken. However,
2203writing RSET might have failed, or there may be other addresses whose hosts are
2204specified in the transports, and therefore not visible at top level, in which
2205case continue_more won't get set. */
2206
2207HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2208if (sx->send_quit)
2209 {
2210 shutdown(sx->outblock.sock, SHUT_WR);
2211 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2212 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2213 rc--; /* drain socket */
02b41d71 2214 sx->send_quit = FALSE;
d093f8e5
JH
2215 }
2216(void)close(sx->inblock.sock);
02b41d71 2217sx->inblock.sock = sx->outblock.sock = -1;
d093f8e5
JH
2218
2219#ifndef DISABLE_EVENT
2220(void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2221#endif
2222
2223continue_transport = NULL;
2224continue_hostname = NULL;
2225return yield;
2226}
2227
2228
9be4572b
JH
2229
2230
2231/* Create the string of options that will be appended to the MAIL FROM:
2232in the connection context buffer */
2233
2234static int
2235build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2236{
2237uschar * p = sx->buffer;
2238address_item * addr;
2239int address_count;
2240
2241*p = 0;
2242
2243/* If we know the receiving MTA supports the SIZE qualification,
2244send it, adding something to the message size to allow for imprecision
2245and things that get added en route. Exim keeps the number of lines
2246in a message, so we can give an accurate value for the original message, but we
2247need some additional to handle added headers. (Double "." characters don't get
2248included in the count.) */
2249
2250if (sx->peer_offered & PEER_OFFERED_SIZE)
2251 {
2252 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2253 while (*p) p++;
2254 }
2255
2256#ifndef DISABLE_PRDR
2257/* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2258request that */
2259
2260sx->prdr_active = FALSE;
2261if (sx->peer_offered & PEER_OFFERED_PRDR)
2262 for (addr = addrlist; addr; addr = addr->next)
2263 if (addr->transport_return == PENDING_DEFER)
2264 {
2265 for (addr = addr->next; addr; addr = addr->next)
2266 if (addr->transport_return == PENDING_DEFER)
2267 { /* at least two recipients to send */
2268 sx->prdr_active = TRUE;
2269 sprintf(CS p, " PRDR"); p += 5;
2270 break;
2271 }
2272 break;
2273 }
2274#endif
2275
2276#ifdef SUPPORT_I18N
2277/* If it supports internationalised messages, and this meesage need that,
2278request it */
2279
2280if ( sx->peer_offered & PEER_OFFERED_UTF8
2281 && addrlist->prop.utf8_msg
2282 && !addrlist->prop.utf8_downcvt
2283 )
2284 Ustrcpy(p, " SMTPUTF8"), p += 9;
2285#endif
2286
2287/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2288for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2289 addr && address_count < sx->max_rcpt;
2290 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2291 {
2292 address_count++;
2293 if (!(addr->dsn_flags & rf_dsnlasthop))
2294 {
2295 sx->dsn_all_lasthop = FALSE;
2296 break;
2297 }
2298 }
2299
2300/* Add any DSN flags to the mail command */
2301
2302if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2303 {
2304 if (dsn_ret == dsn_ret_hdrs)
2305 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2306 else if (dsn_ret == dsn_ret_full)
2307 { Ustrcpy(p, " RET=FULL"); p += 9; }
2308
2309 if (dsn_envid)
2310 {
2311 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2312 while (*p) p++;
2313 }
2314 }
2315
2316/* If an authenticated_sender override has been specified for this transport
2317instance, expand it. If the expansion is forced to fail, and there was already
2318an authenticated_sender for this message, the original value will be used.
2319Other expansion failures are serious. An empty result is ignored, but there is
2320otherwise no check - this feature is expected to be used with LMTP and other
2321cases where non-standard addresses (e.g. without domains) might be required. */
2322
2323if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2324 return ERROR;
2325
2326return OK;
2327}
2328
2329
2330static void
2331build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2332{
2333uschar * p = sx->buffer;
2334*p = 0;
2335
2336/* Add any DSN flags to the rcpt command */
2337
2338if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2339 {
2340 if (addr->dsn_flags & rf_dsnflags)
2341 {
2342 int i;
2343 BOOL first = TRUE;
2344
2345 Ustrcpy(p, " NOTIFY=");
2346 while (*p) p++;
2347 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2348 {
2349 if (!first) *p++ = ',';
2350 first = FALSE;
2351 Ustrcpy(p, rf_names[i]);
2352 while (*p) p++;
2353 }
2354 }
2355
2356 if (addr->dsn_orcpt)
2357 {
2358 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2359 addr->dsn_orcpt);
2360 while (*p) p++;
2361 }
2362 }
2363}
2364
2365
d093f8e5
JH
2366/*************************************************
2367* Deliver address list to given host *
2368*************************************************/
2369
2370/* If continue_hostname is not null, we get here only when continuing to
2371deliver down an existing channel. The channel was passed as the standard
2372input. TLS is never active on a passed channel; the previous process always
2373closes it down before passing the connection on.
2374
2375Otherwise, we have to make a connection to the remote host, and do the
2376initial protocol exchange.
2377
2378When running as an MUA wrapper, if the sender or any recipient is rejected,
2379temporarily or permanently, we force failure for all recipients.
2380
2381Arguments:
2382 addrlist chain of potential addresses to deliver; only those whose
2383 transport_return field is set to PENDING_DEFER are currently
2384 being processed; others should be skipped - they have either
2385 been delivered to an earlier host or IP address, or been
2386 failed by one of them.
2387 host host to deliver to
2388 host_af AF_INET or AF_INET6
2389 port default TCP/IP port to use, in host byte order
2390 interface interface to bind to, or NULL
2391 tblock transport instance block
2392 message_defer set TRUE if yield is OK, but all addresses were deferred
2393 because of a non-recipient, non-host failure, that is, a
2394 4xx response to MAIL FROM, DATA, or ".". This is a defer
2395 that is specific to the message.
2396 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2397 a second attempt after TLS initialization fails
2398
2399Returns: OK - the connection was made and the delivery attempted;
2400 the result for each address is in its data block.
2401 DEFER - the connection could not be made, or something failed
2402 while setting up the SMTP session, or there was a
2403 non-message-specific error, such as a timeout.
2404 ERROR - a filter command is specified for this transport,
2405 and there was a problem setting it up; OR helo_data
2406 or add_headers or authenticated_sender is specified
2407 for this transport, and the string failed to expand
2408*/
2409
2410static int
2411smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2412 uschar *interface, transport_instance *tblock,
2413 BOOL *message_defer, BOOL suppress_tls)
2414{
2415address_item *addr;
2416address_item *sync_addr;
2417address_item *first_addr = addrlist;
2418int yield = OK;
2419int address_count;
2420int save_errno;
2421int rc;
2422time_t start_delivery_time = time(NULL);
2423
2424BOOL completed_address = FALSE;
2425
2426
2427BOOL pass_message = FALSE;
2428uschar *message = NULL;
2429uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2430uschar *p;
2431
2432smtp_context sx;
2433
2434suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
02b41d71 2435*message_defer = FALSE;
d093f8e5
JH
2436
2437sx.addrlist = addrlist;
2438sx.host = host;
2439sx.host_af = host_af,
2440sx.port = port;
2441sx.interface = interface;
02b41d71 2442sx.helo_data = NULL;
d093f8e5
JH
2443sx.tblock = tblock;
2444
9be4572b
JH
2445/* Get the channel set up ready for a message (MAIL FROM being the next
2446SMTP command to send */
2447
02b41d71 2448if ((rc = smtp_setup_conn(&sx, suppress_tls, FALSE)) != OK)
d093f8e5
JH
2449 return rc;
2450
0756eb3c
PH
2451/* If there is a filter command specified for this transport, we can now
2452set it up. This cannot be done until the identify of the host is known. */
2453
2454if (tblock->filter_command != NULL)
2455 {
2456 BOOL rc;
76ac1b5b
JH
2457 uschar fbuf[64];
2458 sprintf(CS fbuf, "%.50s transport", tblock->name);
0756eb3c 2459 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
76ac1b5b 2460 TRUE, DEFER, addrlist, fbuf, NULL);
9b989985 2461 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2462
2463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2464 yield ERROR. */
2465
2466 if (!rc)
2467 {
895fbaf2
JH
2468 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2469 FALSE);
0756eb3c
PH
2470 yield = ERROR;
2471 goto SEND_QUIT;
2472 }
48f1c853
JH
2473
2474 if ( transport_filter_argv
2475 && *transport_filter_argv
2476 && **transport_filter_argv
d093f8e5 2477 && sx.peer_offered & PEER_OFFERED_CHUNKING
48f1c853
JH
2478 )
2479 {
d093f8e5 2480 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
48f1c853
JH
2481 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2482 }
0756eb3c
PH
2483 }
2484
2485
2486/* For messages that have more than the maximum number of envelope recipients,
2487we want to send several transactions down the same SMTP connection. (See
2488comments in deliver.c as to how this reconciles, heuristically, with
2489remote_max_parallel.) This optimization was added to Exim after the following
2490code was already working. The simplest way to put it in without disturbing the
2491code was to use a goto to jump back to this point when there is another
2492transaction to handle. */
2493
2494SEND_MESSAGE:
2495sync_addr = first_addr;
d093f8e5
JH
2496sx.ok = FALSE;
2497sx.send_rset = TRUE;
0756eb3c
PH
2498completed_address = FALSE;
2499
2500
9be4572b 2501/* Initiate a message transfer. */
6b62e899 2502
9be4572b 2503if (build_mailcmd_options(&sx, first_addr) != OK)
a7538db1
JH
2504 {
2505 yield = ERROR;
2506 goto SEND_QUIT;
2507 }
0756eb3c
PH
2508
2509/* From here until we send the DATA command, we can make use of PIPELINING
2510if the server host supports it. The code has to be able to check the responses
2511at any point, for when the buffer fills up, so we write it totally generally.
2512When PIPELINING is off, each command written reports that it has flushed the
2513buffer. */
2514
d093f8e5 2515sx.pending_MAIL = TRUE; /* The block starts with MAIL */
0756eb3c 2516
3c8b3577
JH
2517 {
2518 uschar * s = return_path;
8c5d388a 2519#ifdef SUPPORT_I18N
3c8b3577
JH
2520 uschar * errstr = NULL;
2521
2522 /* If we must downconvert, do the from-address here. Remember we had to
2523 for the to-addresses (done below), and also (ugly) for re-doing when building
2524 the delivery log line. */
2525
9094b84b 2526 if ( addrlist->prop.utf8_msg
d093f8e5 2527 && (addrlist->prop.utf8_downcvt || !(sx.peer_offered & PEER_OFFERED_UTF8))
9094b84b 2528 )
3c8b3577
JH
2529 {
2530 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2531 {
895fbaf2 2532 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH
2533 yield = ERROR;
2534 goto SEND_QUIT;
2535 }
2536 setflag(addrlist, af_utf8_downcvt);
2537 }
2538#endif
2539
d093f8e5
JH
2540 rc = smtp_write_command(&sx.outblock, pipelining_active,
2541 "MAIL FROM:<%s>%s\r\n", s, sx.buffer);
3c8b3577
JH
2542 }
2543
0756eb3c
PH
2544mail_command = string_copy(big_buffer); /* Save for later error message */
2545
2546switch(rc)
2547 {
2548 case -1: /* Transmission error */
7ade712c 2549 goto SEND_FAILED;
0756eb3c
PH
2550
2551 case +1: /* Block was sent */
d093f8e5
JH
2552 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2553 sx.ob->command_timeout))
e97957bc 2554 {
d093f8e5 2555 if (errno == 0 && sx.buffer[0] == '4')
7ade712c
JH
2556 {
2557 errno = ERRNO_MAIL4XX;
d093f8e5 2558 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
7ade712c
JH
2559 }
2560 goto RESPONSE_FAILED;
e97957bc 2561 }
d093f8e5 2562 sx.pending_MAIL = FALSE;
7ade712c 2563 break;
0756eb3c
PH
2564 }
2565
2566/* Pass over all the relevant recipient addresses for this host, which are the
2567ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2568several before we have to read the responses for those seen so far. This
2569checking is done by a subroutine because it also needs to be done at the end.
2570Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2571the next one if not all are sent.
2572
2573In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2574last address because we want to abort if any recipients have any kind of
2575problem, temporary or permanent. We know that all recipient addresses will have
2576the PENDING_DEFER status, because only one attempt is ever made, and we know
2577that max_rcpt will be large, so all addresses will be done at once. */
2578
d093f8e5
JH
2579for (addr = first_addr, address_count = 0;
2580 addr && address_count < sx.max_rcpt;
2581 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
0756eb3c
PH
2582 {
2583 int count;
2584 BOOL no_flush;
3c8b3577 2585 uschar * rcpt_addr;
0756eb3c 2586
d093f8e5 2587 addr->dsn_aware = sx.peer_offered & PEER_OFFERED_DSN
2d14f397 2588 ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2589
0756eb3c 2590 address_count++;
2d14f397 2591 no_flush = pipelining_active && (!mua_wrapper || addr->next);
0756eb3c 2592
9be4572b 2593 build_rcptcmd_options(&sx, addr);
6c1c3d1d 2594
0756eb3c
PH
2595 /* Now send the RCPT command, and process outstanding responses when
2596 necessary. After a timeout on RCPT, we just end the function, leaving the
2597 yield as OK, because this error can often mean that there is a problem with
2598 just one address, so we don't want to delay the host. */
2599
3c8b3577
JH
2600 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2601
8c5d388a 2602#ifdef SUPPORT_I18N
3c8b3577 2603 if ( testflag(addrlist, af_utf8_downcvt)
9427e879
JH
2604 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2605 )
3c8b3577 2606 {
9427e879 2607 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3c8b3577
JH
2608 errno = ERRNO_EXPANDFAIL;
2609 goto SEND_FAILED;
2610 }
3c8b3577
JH
2611#endif
2612
d093f8e5
JH
2613 count = smtp_write_command(&sx.outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2614 rcpt_addr, sx.igquotstr, sx.buffer);
6c1c3d1d 2615
0756eb3c
PH
2616 if (count < 0) goto SEND_FAILED;
2617 if (count > 0)
2618 {
2619 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
d093f8e5
JH
2620 &sync_addr, host, count, sx.ob->address_retry_include_sender,
2621 sx.pending_MAIL, 0, &sx.inblock, sx.ob->command_timeout, sx.buffer,
2622 sizeof(sx.buffer)))
0756eb3c 2623 {
d093f8e5 2624 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
0756eb3c
PH
2625 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2626 break;
2627
d093f8e5
JH
2628 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2629 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
0756eb3c
PH
2630 case 0: /* No 2xx or 5xx, but no probs */
2631 break;
2632
2633 case -1: goto END_OFF; /* Timeout on RCPT */
2634 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2635 }
d093f8e5 2636 sx.pending_MAIL = FALSE; /* Dealt with MAIL */
0756eb3c
PH
2637 }
2638 } /* Loop for next address */
2639
9be4572b
JH
2640/*XXX potential break point for verify-callouts here. The MAIL and
2641RCPT handling is relevant there */
2642
0756eb3c
PH
2643/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2644permanently or temporarily. We should have flushed and synced after the last
2645RCPT. */
2646
2647if (mua_wrapper)
2648 {
2649 address_item *badaddr;
168dec3b
JH
2650 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2651 if (badaddr->transport_return != PENDING_OK)
2652 {
2653 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH
2654 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2655 testflag(badaddr, af_pass_message));
d093f8e5 2656 sx.ok = FALSE;
168dec3b
JH
2657 break;
2658 }
0756eb3c
PH
2659 }
2660
2661/* If ok is TRUE, we know we have got at least one good recipient, and must now
2662send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2663have a good recipient buffered up if we are pipelining. We don't want to waste
2664time sending DATA needlessly, so we only send it if either ok is TRUE or if we
6d5c916c
JH
2665are pipelining. The responses are all handled by sync_responses().
2666If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2667to send is. */
0756eb3c 2668
d093f8e5
JH
2669if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2670 && (sx.ok || (pipelining_active && !mua_wrapper)))
0756eb3c 2671 {
d093f8e5 2672 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
6d5c916c 2673
0756eb3c
PH
2674 if (count < 0) goto SEND_FAILED;
2675 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
d093f8e5
JH
2676 host, count, sx.ob->address_retry_include_sender, sx.pending_MAIL,
2677 sx.ok ? +1 : -1, &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
0756eb3c 2678 {
d093f8e5 2679 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
0756eb3c
PH
2680 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2681 break;
2682
d093f8e5
JH
2683 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2684 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
0756eb3c
PH
2685 case 0: break; /* No 2xx or 5xx, but no probs */
2686
2687 case -1: goto END_OFF; /* Timeout on RCPT */
2688 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2689 }
0d9fa8c0 2690 pipelining_active = FALSE;
87cb4a16 2691 data_command = string_copy(big_buffer); /* Save for later error message */
0756eb3c
PH
2692 }
2693
0756eb3c
PH
2694/* If there were no good recipients (but otherwise there have been no
2695problems), just set ok TRUE, since we have handled address-specific errors
2696already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2697for handling the SMTP dot-handling protocol, flagging to apply to headers as
2698well as body. Set the appropriate timeout value to be used for each chunk.
2699(Haven't been able to make it work using select() for writing yet.) */
2700
d093f8e5 2701if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
6d5c916c
JH
2702 {
2703 /* Save the first address of the next batch. */
2704 first_addr = addr;
2705
d093f8e5 2706 sx.ok = TRUE;
6d5c916c 2707 }
ff5aac2b 2708else
0756eb3c 2709 {
6b46ecc6
JH
2710 transport_ctx tctx = {
2711 tblock,
2712 addrlist,
2713 US".", US"..", /* Escaping strings */
65de12cc 2714 topt_use_crlf | topt_escape_headers
6b46ecc6
JH
2715 | (tblock->body_only ? topt_no_headers : 0)
2716 | (tblock->headers_only ? topt_no_body : 0)
2717 | (tblock->return_path_add ? topt_add_return_path : 0)
2718 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2719 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2720 };
2721
6d5c916c
JH
2722 /* If using CHUNKING we need a callback from the generic transport
2723 support to us, for the sending of BDAT smtp commands and the reaping
2724 of responses. The callback needs a whole bunch of state so set up
2725 a transport-context structure to be passed around. */
2726
d093f8e5 2727 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
59932f7d 2728 {
65de12cc 2729 tctx.check_string = tctx.escape_string = NULL;
6d5c916c
JH
2730 tctx.options |= topt_use_bdat;
2731 tctx.chunk_cb = smtp_chunk_cmd_callback;
d093f8e5
JH
2732 tctx.inblock = &sx.inblock;
2733 tctx.outblock = &sx.outblock;
6d5c916c
JH
2734 tctx.host = host;
2735 tctx.first_addr = first_addr;
2736 tctx.sync_addr = &sync_addr;
d093f8e5 2737 tctx.pending_MAIL = sx.pending_MAIL;
e027f545 2738 tctx.pending_BDAT = FALSE;
d093f8e5 2739 tctx.good_RCPT = sx.ok;
6d5c916c 2740 tctx.completed_address = &completed_address;
e027f545 2741 tctx.cmd_count = 0;
d093f8e5 2742 tctx.buffer = sx.buffer;
59932f7d
JH
2743 }
2744 else
65de12cc 2745 tctx.options |= topt_end_dot;
59932f7d 2746
6d5c916c
JH
2747 /* Save the first address of the next batch. */
2748 first_addr = addr;
2749
e027f545
JH
2750 /* Responses from CHUNKING commands go in buffer. Otherwise,
2751 there has not been a response. */
2752
d093f8e5 2753 sx.buffer[0] = 0;
e027f545 2754
0756eb3c 2755 sigalrm_seen = FALSE;
d093f8e5 2756 transport_write_timeout = sx.ob->data_timeout;
0756eb3c
PH
2757 smtp_command = US"sending data block"; /* For error messages */
2758 DEBUG(D_transport|D_v)
d093f8e5 2759 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
6d5c916c
JH
2760 debug_printf(" will write message using CHUNKING\n");
2761 else
2762 debug_printf(" SMTP>> writing message and terminating \".\"\n");
0756eb3c 2763 transport_count = 0;
a7538db1 2764
80a47a2c 2765#ifndef DISABLE_DKIM
d093f8e5 2766 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
4cd12fe9 2767#else
d093f8e5 2768 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
4cd12fe9 2769#endif
0756eb3c
PH
2770
2771 /* transport_write_message() uses write() because it is called from other
2772 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2773 it can exit with "Broken pipe" as its error. This really means that the
2774 socket got closed at the far end. */
2775
2776 transport_write_timeout = 0; /* for subsequent transports */
2777
2778 /* Failure can either be some kind of I/O disaster (including timeout),
e027f545
JH
2779 or the failure of a transport filter or the expansion of added headers.
2780 Or, when CHUNKING, it can be a protocol-detected failure. */
0756eb3c 2781
d093f8e5 2782 if (!sx.ok)
0756eb3c 2783 goto RESPONSE_FAILED;
0756eb3c
PH
2784
2785 /* We used to send the terminating "." explicitly here, but because of
2786 buffering effects at both ends of TCP/IP connections, you don't gain
2787 anything by keeping it separate, so it might as well go in the final
2788 data buffer for efficiency. This is now done by setting the topt_end_dot
2789 flag above. */
2790
2791 smtp_command = US"end of data";
2792
d093f8e5 2793 if (sx.peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
6d5c916c
JH
2794 {
2795 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2796 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
d093f8e5
JH
2797 host, tctx.cmd_count-1, sx.ob->address_retry_include_sender,
2798 sx.pending_MAIL, 0,
2799 &sx.inblock, sx.ob->command_timeout, sx.buffer, sizeof(sx.buffer)))
6d5c916c 2800 {
d093f8e5 2801 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
6d5c916c
JH
2802 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2803 break;
2804
d093f8e5
JH
2805 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2806 if (!sx.lmtp) completed_address = TRUE; /* can't tell about progress yet */
6d5c916c
JH
2807 case 0: break; /* No 2xx or 5xx, but no probs */
2808
2809 case -1: goto END_OFF; /* Timeout on RCPT */
2810 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2811 }
2812 }
2813
8ccd00b1 2814#ifndef DISABLE_PRDR
fd98a5c6
JH
2815 /* For PRDR we optionally get a partial-responses warning
2816 * followed by the individual responses, before going on with
2817 * the overall response. If we don't get the warning then deal
2818 * with per non-PRDR. */
d093f8e5 2819 if(sx.prdr_active)
fd98a5c6 2820 {
d093f8e5
JH
2821 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2822 sx.ob->final_timeout);
2823 if (!sx.ok && errno == 0) switch(sx.buffer[0])
e027f545 2824 {
d093f8e5
JH
2825 case '2': sx.prdr_active = FALSE;
2826 sx.ok = TRUE;
e027f545
JH
2827 break;
2828 case '4': errno = ERRNO_DATA4XX;
2829 addrlist->more_errno |=
d093f8e5 2830 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e027f545
JH
2831 break;
2832 }
fd98a5c6
JH
2833 }
2834 else
2835#endif
2836
2837 /* For non-PRDR SMTP, we now read a single response that applies to the
2838 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2839
d093f8e5 2840 if (!sx.lmtp)
e97957bc 2841 {
d093f8e5
JH
2842 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2843 sx.ob->final_timeout);
2844 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
e97957bc
PH
2845 {
2846 errno = ERRNO_DATA4XX;
d093f8e5 2847 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e97957bc
PH
2848 }
2849 }
0756eb3c
PH
2850
2851 /* For LMTP, we get back a response for every RCPT command that we sent;
2852 some may be accepted and some rejected. For those that get a response, their
2853 status is fixed; any that are accepted have been handed over, even if later
2854 responses crash - at least, that's how I read RFC 2033.
2855
2856 If all went well, mark the recipient addresses as completed, record which
2857 host/IPaddress they were delivered to, and cut out RSET when sending another
2858 message down the same channel. Write the completed addresses to the journal
2859 now so that they are recorded in case there is a crash of hardware or
2860 software before the spool gets updated. Also record the final SMTP
2861 confirmation if needed (for SMTP only). */
2862
d093f8e5 2863 if (sx.ok)
0756eb3c
PH
2864 {
2865 int flag = '=';
2866 int delivery_time = (int)(time(NULL) - start_delivery_time);
2867 int len;
0756eb3c 2868 uschar *conf = NULL;
0d9fa8c0 2869
d093f8e5 2870 sx.send_rset = FALSE;
0d9fa8c0 2871 pipelining_active = FALSE;
0756eb3c 2872
0756eb3c
PH
2873 /* Set up confirmation if needed - applies only to SMTP */
2874
d68218c7 2875 if (
0cbf2b82 2876#ifdef DISABLE_EVENT
6c6d6e48 2877 LOGGING(smtp_confirmation) &&
a7538db1 2878#endif
d093f8e5 2879 !sx.lmtp
d68218c7 2880 )
0756eb3c 2881 {
d093f8e5 2882 const uschar *s = string_printing(sx.buffer);
55414b25 2883 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 2884 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2885 }
2886
fd98a5c6 2887 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2888 each one. */
2889
2890 for (addr = addrlist; addr != first_addr; addr = addr->next)
2891 {
2892 if (addr->transport_return != PENDING_OK) continue;
2893
2894 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2895 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2896 address. For temporary errors, add a retry item for the address so that
2897 it doesn't get tried again too soon. */
0756eb3c 2898
8ccd00b1 2899#ifndef DISABLE_PRDR
d093f8e5 2900 if (sx.lmtp || sx.prdr_active)
fd98a5c6 2901#else
d093f8e5 2902 if (sx.lmtp)
fd98a5c6 2903#endif
0756eb3c 2904 {
d093f8e5
JH
2905 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2906 sx.ob->final_timeout))
0756eb3c 2907 {
d093f8e5 2908 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2909 addr->message = string_sprintf(
8ccd00b1 2910#ifndef DISABLE_PRDR
d093f8e5 2911 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
fd98a5c6
JH
2912#else
2913 "LMTP error after %s: %s",
2914#endif
d093f8e5 2915 data_command, string_printing(sx.buffer));
75def545 2916 setflag(addr, af_pass_message); /* Allow message to go to user */
d093f8e5 2917 if (sx.buffer[0] == '5')
75def545
PH
2918 addr->transport_return = FAIL;
2919 else
2920 {
e97957bc 2921 errno = ERRNO_DATA4XX;
d093f8e5 2922 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
75def545 2923 addr->transport_return = DEFER;
8ccd00b1 2924#ifndef DISABLE_PRDR
d093f8e5 2925 if (!sx.prdr_active)
fd98a5c6
JH
2926#endif
2927 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2928 }
0756eb3c
PH
2929 continue;
2930 }
2931 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2932 if (LOGGING(smtp_confirmation))
c0ea85ab 2933 {
d093f8e5 2934 const uschar *s = string_printing(sx.buffer);
55414b25 2935 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 2936 conf = (s == sx.buffer) ? US string_copy(s) : US s;
c0ea85ab 2937 }
0756eb3c
PH
2938 }
2939
2940 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2941 actual host that was used. */
0756eb3c
PH
2942
2943 addr->transport_return = OK;
2944 addr->more_errno = delivery_time;
d427a7f9 2945 addr->host_used = host;
0756eb3c
PH
2946 addr->special_action = flag;
2947 addr->message = conf;
8ccd00b1 2948#ifndef DISABLE_PRDR
d093f8e5 2949 if (sx.prdr_active) addr->flags |= af_prdr_used;
fd98a5c6 2950#endif
d093f8e5 2951 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
0756eb3c
PH
2952 flag = '-';
2953
8ccd00b1 2954#ifndef DISABLE_PRDR
d093f8e5 2955 if (!sx.prdr_active)
fd98a5c6
JH
2956#endif
2957 {
2958 /* Update the journal. For homonymic addresses, use the base address plus
2959 the transport name. See lots of comments in deliver.c about the reasons
2960 for the complications when homonyms are involved. Just carry on after
2961 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2962
fd98a5c6 2963 if (testflag(addr, af_homonym))
d093f8e5 2964 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
fd98a5c6 2965 else
d093f8e5 2966 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4d8d62b9 2967
d093f8e5
JH
2968 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2969 len = Ustrlen(CS sx.buffer);
2970 if (write(journal_fd, sx.buffer, len) != len)
fd98a5c6 2971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
d093f8e5 2972 "%s: %s", sx.buffer, strerror(errno));
fd98a5c6 2973 }
0756eb3c
PH
2974 }
2975
8ccd00b1 2976#ifndef DISABLE_PRDR
d093f8e5 2977 if (sx.prdr_active)
fd98a5c6
JH
2978 {
2979 /* PRDR - get the final, overall response. For any non-success
2980 upgrade all the address statuses. */
d093f8e5
JH
2981 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2982 sx.ob->final_timeout);
2983 if (!sx.ok)
fd98a5c6 2984 {
d093f8e5 2985 if(errno == 0 && sx.buffer[0] == '4')
fd98a5c6
JH
2986 {
2987 errno = ERRNO_DATA4XX;
d093f8e5 2988 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
fd98a5c6
JH
2989 }
2990 for (addr = addrlist; addr != first_addr; addr = addr->next)
d093f8e5 2991 if (sx.buffer[0] == '5' || addr->transport_return == OK)
fd98a5c6
JH
2992 addr->transport_return = PENDING_OK; /* allow set_errno action */
2993 goto RESPONSE_FAILED;
2994 }
2995
2996 /* Update the journal, or setup retry. */
2997 for (addr = addrlist; addr != first_addr; addr = addr->next)
2998 if (addr->transport_return == OK)
9be4572b
JH
2999 {
3000 if (testflag(addr, af_homonym))
3001 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3002 else
3003 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3004
3005 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3006 len = Ustrlen(CS sx.buffer);
3007 if (write(journal_fd, sx.buffer, len) != len)
3008 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3009 "%s: %s", sx.buffer, strerror(errno));
3010 }
3011 else if (addr->transport_return == DEFER)
3012 retry_add_item(addr, addr->address_retry_key, -2);
fd98a5c6
JH
3013 }
3014#endif
3015
0756eb3c
PH
3016 /* Ensure the journal file is pushed out to disk. */
3017
54fc8428 3018 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
3019 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3020 strerror(errno));
3021 }
3022 }
3023
3024
3025/* Handle general (not specific to one address) failures here. The value of ok
3026is used to skip over this code on the falling through case. A timeout causes a
3027deferral. Other errors may defer or fail according to the response code, and
3028may set up a special errno value, e.g. after connection chopped, which is
3029assumed if errno == 0 and there is no text in the buffer. If control reaches
3030here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3031the problem is not related to this specific message. */
3032
d093f8e5 3033if (!sx.ok)
0756eb3c 3034 {
895fbaf2
JH
3035 int code, set_rc;
3036 uschar * set_message;
0756eb3c
PH
3037
3038 RESPONSE_FAILED:
895fbaf2
JH
3039 {
3040 save_errno = errno;
3041 message = NULL;
d093f8e5
JH
3042 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3043 sx.buffer, &code, &message, &pass_message);
895fbaf2
JH
3044 goto FAILED;
3045 }
0756eb3c
PH
3046
3047 SEND_FAILED:
895fbaf2
JH
3048 {
3049 save_errno = errno;
3050 code = '4';
3051 message = US string_sprintf("send() to %s [%s] failed: %s",
3052 host->name, host->address, strerror(save_errno));
d093f8e5 3053 sx.send_quit = FALSE;
895fbaf2
JH
3054 goto FAILED;
3055 }
0756eb3c 3056
0756eb3c 3057 FAILED:
9be4572b
JH
3058 {
3059 BOOL message_error;
0756eb3c 3060
9be4572b
JH
3061 sx.ok = FALSE; /* For when reached by GOTO */
3062 set_message = message;
0756eb3c 3063
e97957bc 3064 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 3065 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
3066 the contents of the message rather than a real error on the connection. These
3067 cases are treated in the same way as a 4xx response. This next bit of code
3068 does the classification. */
0756eb3c 3069
e97957bc
PH
3070 switch(save_errno)
3071 {
3072 case 0:
3073 case ERRNO_MAIL4XX:
3074 case ERRNO_DATA4XX:
250b6871
JH
3075 message_error = TRUE;
3076 break;
0756eb3c 3077
e97957bc 3078 case ETIMEDOUT:
250b6871
JH
3079 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3080 Ustrncmp(smtp_command,"end ",4) == 0;
3081 break;
e97957bc
PH
3082
3083 case ERRNO_SMTPCLOSED:
250b6871
JH
3084 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3085 break;
e97957bc
PH
3086
3087 default:
250b6871
JH
3088 message_error = FALSE;
3089 break;
e97957bc 3090 }
0756eb3c 3091
e97957bc 3092 /* Handle the cases that are treated as message errors. These are:
0756eb3c 3093
e97957bc
PH
3094 (a) negative response or timeout after MAIL
3095 (b) negative response after DATA
3096 (c) negative response or timeout or dropped connection after "."
250b6871 3097 (d) utf8 support required and not offered
0756eb3c 3098
e97957bc
PH
3099 It won't be a negative response or timeout after RCPT, as that is dealt
3100 with separately above. The action in all cases is to set an appropriate
3101 error code for all the addresses, but to leave yield set to OK because the
3102 host itself has not failed. Of course, it might in practice have failed
3103 when we've had a timeout, but if so, we'll discover that at the next
3104 delivery attempt. For a temporary error, set the message_defer flag, and
3105 write to the logs for information if this is not the last host. The error
3106 for the last host will be logged as part of the address's log line. */
3107
3108 if (message_error)
0756eb3c 3109 {
e97957bc 3110 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH
3111
3112 /* If there's an errno, the message contains just the identity of
3113 the host. */
3114
895fbaf2
JH
3115 if (code == '5')
3116 set_rc = FAIL;
3117 else /* Anything other than 5 is treated as temporary */
e97957bc 3118 {
895fbaf2 3119 set_rc = DEFER;
e97957bc
PH
3120 if (save_errno > 0)
3121 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3122 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 3123 msglog_line(host, message);
e97957bc
PH
3124 *message_defer = TRUE;
3125 }
3126 }
3127
3128 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3129 ".", or some other transportation error. We defer all addresses and yield
3130 DEFER, except for the case of failed add_headers expansion, or a transport
3131 filter failure, when the yield should be ERROR, to stop it trying other
3132 hosts. */
3133
3134 else
3135 {
895fbaf2 3136 set_rc = DEFER;
e97957bc
PH
3137 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3138 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH
3139 }
3140 }
895fbaf2
JH
3141
3142 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3143#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 3144 , sx.smtp_greeting, sx.helo_response
895fbaf2
JH
3145#endif
3146 );
0756eb3c
PH
3147 }
3148
3149
3150/* If all has gone well, send_quit will be set TRUE, implying we can end the
3151SMTP session tidily. However, if there were too many addresses to send in one
3152message (indicated by first_addr being non-NULL) we want to carry on with the
3153rest of them. Also, it is desirable to send more than one message down the SMTP
3154connection if there are several waiting, provided we haven't already sent so
3155many as to hit the configured limit. The function transport_check_waiting looks
3156for a waiting message and returns its id. Then transport_pass_socket tries to
3157set up a continued delivery by passing the socket on to another process. The
3158variable send_rset is FALSE if a message has just been successfully transfered.
3159
3160If we are already sending down a continued channel, there may be further
3161addresses not yet delivered that are aimed at the same host, but which have not
3162been passed in this run of the transport. In this case, continue_more will be
3163true, and all we should do is send RSET if necessary, and return, leaving the
3164channel open.
3165
3166However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3167do not want to continue with other messages down the same channel, because that
3168can lead to looping between two or more messages, all with the same,
3169temporarily failing address(es). [The retry information isn't updated yet, so
3170new processes keep on trying.] We probably also don't want to try more of this
3171message's addresses either.
3172
3173If we have started a TLS session, we have to end it before passing the
3174connection to a new process. However, not all servers can handle this (Exim
3175can), so we do not pass such a connection on if the host matches
3176hosts_nopass_tls. */
3177
3178DEBUG(D_transport)
3179 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
d093f8e5
JH
3180 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3181 sx.send_rset, continue_more, yield, first_addr ? "not " : "");
0756eb3c 3182
d093f8e5 3183if (completed_address && sx.ok && sx.send_quit)
0756eb3c
PH
3184 {
3185 BOOL more;
a39bd74d
JB
3186 smtp_compare_t t_compare;
3187
3188 t_compare.tblock = tblock;
3189 t_compare.current_sender_address = sender_address;
3190
5130845b
JH
3191 if ( first_addr != NULL
3192 || continue_more
3193 || ( ( tls_out.active < 0
d093f8e5 3194 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
5130845b 3195 )
0756eb3c
PH
3196 &&
3197 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
3198 tblock->connection_max_messages, new_message_id, &more,
3199 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 3200 ) )
0756eb3c
PH
3201 {
3202 uschar *msg;
447d236c 3203 BOOL pass_message;
0756eb3c 3204
d093f8e5
JH
3205 if (sx.send_rset)
3206 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
0756eb3c
PH
3207 {
3208 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3209 host->address, strerror(save_errno));
d093f8e5 3210 sx.send_quit = FALSE;
0756eb3c 3211 }
d093f8e5
JH
3212 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3213 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
0756eb3c
PH
3214 {
3215 int code;
d093f8e5 3216 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
447d236c 3217 &pass_message);
d093f8e5 3218 if (!sx.send_quit)
0756eb3c 3219 {
c562fd30
JH
3220 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3221 host->name, host->address, msg);
0756eb3c
PH
3222 }
3223 }
0756eb3c
PH
3224
3225 /* Either RSET was not needed, or it succeeded */
3226
d093f8e5 3227 if (sx.ok)
0756eb3c
PH
3228 {
3229 if (first_addr != NULL) /* More addresses still to be sent */
3230 { /* in this run of the transport */
3231 continue_sequence++; /* Causes * in logging */
3232 goto SEND_MESSAGE;
3233 }
3234 if (continue_more) return yield; /* More addresses for another run */
3235
3236 /* Pass the socket to a new Exim process. Before doing so, we must shut
3237 down TLS. Not all MTAs allow for the continuation of the SMTP session
3238 when TLS is shut down. We test for this by sending a new EHLO. If we
3239 don't get a good response, we don't attempt to pass the socket on. */
3240
a7538db1 3241#ifdef SUPPORT_TLS
817d9f57 3242 if (tls_out.active >= 0)
0756eb3c 3243 {
817d9f57 3244 tls_close(FALSE, TRUE);
2d14f397 3245 smtp_peer_options = smtp_peer_options_wrap;
d093f8e5
JH
3246 sx.ok = !sx.smtps
3247 && smtp_write_command(&sx.outblock, FALSE,
3248 "EHLO %s\r\n", sx.helo_data) >= 0
3249 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3250 '2', sx.ob->command_timeout);
0756eb3c 3251 }
a7538db1 3252#endif
0756eb3c 3253
4c04137d 3254 /* If the socket is successfully passed, we mustn't send QUIT (or
0756eb3c
PH
3255 indeed anything!) from here. */
3256
895fbaf2
JH
3257/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3258propagate it from the initial
3259*/
d093f8e5
JH
3260 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3261 host->address, new_message_id, sx.inblock.sock))
3262 sx.send_quit = FALSE;
0756eb3c
PH
3263 }
3264
3265 /* If RSET failed and there are addresses left, they get deferred. */
3266
895fbaf2
JH
3267 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3268#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 3269 , sx.smtp_greeting, sx.helo_response
895fbaf2
JH
3270#endif
3271 );
0756eb3c
PH
3272 }
3273 }
3274