Copyright updates:
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH
1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
f9ba5e22 5/* Copyright (c) University of Cambridge 1995 - 2018 */
1e1ddfac 6/* Copyright (c) The Exim Maintainers 2020 */
0756eb3c
PH
7/* See the file NOTICE for conditions of use and distribution. */
8
9#include "../exim.h"
10#include "smtp.h"
11
14ca5d2a
JH
12#if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13# error TLS is required for DANE
14#endif
15
0756eb3c
PH
16
17/* Options specific to the smtp transport. This transport also supports LMTP
18over TCP/IP. The options must be in alphabetic order (note that "_" comes
19before the lower case letters). Some live in the transport_instance block so as
20to be publicly visible; these are flagged with opt_public. */
21
13a4b4c1
JH
22#define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
23
0756eb3c 24optionlist smtp_transport_options[] = {
506900af 25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
13a4b4c1 26 OPT_OFF(transport_instance, expand_multi_domain) },
9c695f6d 27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
13a4b4c1 28 LOFF(expand_retry_include_ip_address) },
9c695f6d 29
48c7f9e2 30 { "address_retry_include_sender", opt_bool,
13a4b4c1
JH
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
617d3932 33#ifdef EXPERIMENTAL_ARC
13a4b4c1 34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
617d3932 35#endif
13a4b4c1
JH
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
0756eb3c 40 { "connection_max_messages", opt_int | opt_public,
13a4b4c1 41 OPT_OFF(transport_instance, connection_max_messages) },
5ec37a55 42# ifdef SUPPORT_DANE
13a4b4c1 43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
5ec37a55 44# endif
13a4b4c1
JH
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
80a47a2c 47#ifndef DISABLE_DKIM
13a4b4c1
JH
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
80a47a2c 57#endif
13a4b4c1
JH
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
01603eec 70#ifndef DISABLE_TLS
13a4b4c1 71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
80a47a2c 72#endif
13a4b4c1
JH
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
01603eec 75#ifndef DISABLE_TLS
13a4b4c1
JH
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
80a47a2c 78#endif
13a4b4c1 79 { "hosts_override", opt_bool, LOFF(hosts_override) },
81344b40 80#ifndef DISABLE_PIPE_CONNECT
13a4b4c1 81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
ee8b8090 82#endif
13a4b4c1 83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
01603eec 84#if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
13a4b4c1 85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
44662487 86#endif
13a4b4c1 87 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
01603eec 88#ifndef DISABLE_TLS
c0635b6d 89# ifdef SUPPORT_DANE
13a4b4c1 90 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
7a31d643 91# endif
f2de3a33 92# ifndef DISABLE_OCSP
13a4b4c1 93 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
f5d78688 94# endif
13a4b4c1 95 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
80a47a2c 96#endif
13a4b4c1
JH
97 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
98 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
21ee816d 99#ifdef SUPPORT_DANE
13a4b4c1 100 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
96e47838 101#endif
13a4b4c1 102 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
8ccd00b1 103#ifndef DISABLE_PRDR
13a4b4c1 104 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
fd98a5c6 105#endif
01603eec 106#ifndef DISABLE_TLS
13a4b4c1 107 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
99400968 108#endif
13a4b4c1
JH
109 { "interface", opt_stringptr, LOFF(interface) },
110 { "keepalive", opt_bool, LOFF(keepalive) },
111 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
0756eb3c 112 { "max_rcpt", opt_int | opt_public,
13a4b4c1 113 OPT_OFF(transport_instance, max_addresses) },
506900af 114 { "multi_domain", opt_expand_bool | opt_public,
13a4b4c1
JH
115 OPT_OFF(transport_instance, multi_domain) },
116 { "port", opt_stringptr, LOFF(port) },
117 { "protocol", opt_stringptr, LOFF(protocol) },
118 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
119 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
120 { "size_addition", opt_int, LOFF(size_addition) },
f0989ec0 121#ifdef SUPPORT_SOCKS
13a4b4c1 122 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
7eb6c37c 123#endif
01603eec 124#ifndef DISABLE_TLS
13a4b4c1
JH
125 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
126 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
127 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
128 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
129 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
b10c87b3 130# ifdef EXPERIMENTAL_TLS_RESUME
13a4b4c1 131 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
b10c87b3 132# endif
13a4b4c1
JH
133 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
134 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
135 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
136 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
137 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
138 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
71c15846
JH
139#endif
140#ifdef SUPPORT_I18N
13a4b4c1 141 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
80a47a2c 142#endif
0756eb3c
PH
143};
144
145/* Size of the options list. An extern variable has to be used so that its
146address can appear in the tables drtables.c. */
147
71c15846 148int smtp_transport_options_count = nelem(smtp_transport_options);
0756eb3c 149
d185889f
JH
150
151#ifdef MACRO_PREDEF
152
153/* Dummy values */
154smtp_transport_options_block smtp_transport_option_defaults = {0};
155void smtp_transport_init(transport_instance *tblock) {}
156BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
157void smtp_transport_closedown(transport_instance *tblock) {}
158
159#else /*!MACRO_PREDEF*/
160
161
0756eb3c
PH
162/* Default private options block for the smtp transport. */
163
164smtp_transport_options_block smtp_transport_option_defaults = {
838d897c 165 .hosts = NULL,
847cd15f 166 .fallback_hosts = NULL,
838d897c
JH
167 .hostlist = NULL,
168 .fallback_hostlist = NULL,
838d897c
JH
169 .helo_data = US"$primary_hostname",
170 .interface = NULL,
171 .port = NULL,
172 .protocol = US"smtp",
173 .dscp = NULL,
174 .serialize_hosts = NULL,
175 .hosts_try_auth = NULL,
176 .hosts_require_auth = NULL,
177 .hosts_try_chunking = US"*",
c0635b6d 178#ifdef SUPPORT_DANE
59c0959a 179 .hosts_try_dane = US"*",
838d897c 180 .hosts_require_dane = NULL,
5ec37a55 181 .dane_require_tls_ciphers = NULL,
96e47838 182#endif
efad2f41 183 .hosts_try_fastopen = US"*",
8ccd00b1 184#ifndef DISABLE_PRDR
838d897c 185 .hosts_try_prdr = US"*",
fd98a5c6 186#endif
f2de3a33 187#ifndef DISABLE_OCSP
838d897c
JH
188 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
189 .hosts_require_ocsp = NULL,
f5d78688 190#endif
838d897c
JH
191 .hosts_require_tls = NULL,
192 .hosts_avoid_tls = NULL,
193 .hosts_verify_avoid_tls = NULL,
194 .hosts_avoid_pipelining = NULL,
81344b40 195#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
196 .hosts_pipe_connect = NULL,
197#endif
838d897c 198 .hosts_avoid_esmtp = NULL,
01603eec 199#ifndef DISABLE_TLS
838d897c 200 .hosts_nopass_tls = NULL,
96eb7d2a 201 .hosts_noproxy_tls = NULL,
57cc2785 202#endif
838d897c
JH
203 .command_timeout = 5*60,
204 .connect_timeout = 5*60,
205 .data_timeout = 5*60,
206 .final_timeout = 10*60,
207 .size_addition = 1024,
208 .hosts_max_try = 5,
209 .hosts_max_try_hardlimit = 50,
210 .address_retry_include_sender = TRUE,
211 .allow_localhost = FALSE,
212 .authenticated_sender_force = FALSE,
213 .gethostbyname = FALSE,
214 .dns_qualify_single = TRUE,
215 .dns_search_parents = FALSE,
ab0e957b 216 .dnssec = { .request= US"*", .require=NULL },
838d897c
JH
217 .delay_after_cutoff = TRUE,
218 .hosts_override = FALSE,
219 .hosts_randomize = FALSE,
220 .keepalive = TRUE,
221 .lmtp_ignore_quota = FALSE,
222 .expand_retry_include_ip_address = NULL,
223 .retry_include_ip_address = TRUE,
f0989ec0 224#ifdef SUPPORT_SOCKS
838d897c 225 .socks_proxy = NULL,
b8bf753b 226#endif
01603eec 227#ifndef DISABLE_TLS
838d897c
JH
228 .tls_certificate = NULL,
229 .tls_crl = NULL,
230 .tls_privatekey = NULL,
231 .tls_require_ciphers = NULL,
232 .tls_sni = NULL,
233 .tls_verify_certificates = US"system",
234 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
235 .tls_tempfail_tryclear = TRUE,
b10c87b3
JH
236# ifdef EXPERIMENTAL_TLS_RESUME
237 .tls_resumption_hosts = NULL,
238# endif
838d897c
JH
239 .tls_verify_hosts = NULL,
240 .tls_try_verify_hosts = US"*",
241 .tls_verify_cert_hostnames = US"*",
80a47a2c 242#endif
71c15846
JH
243#ifdef SUPPORT_I18N
244 .utf8_downconvert = NULL,
245#endif
80a47a2c 246#ifndef DISABLE_DKIM
838d897c
JH
247 .dkim =
248 {.dkim_domain = NULL,
7c6ec81b 249 .dkim_identity = NULL,
838d897c
JH
250 .dkim_private_key = NULL,
251 .dkim_selector = NULL,
252 .dkim_canon = NULL,
7c6ec81b 253 .dkim_sign_headers = NULL,
838d897c 254 .dkim_strict = NULL,
d73e45df 255 .dkim_hash = US"sha256",
2bc0f45e 256 .dkim_timestamps = NULL,
617d3932
JH
257 .dot_stuffed = FALSE,
258 .force_bodyhash = FALSE,
259# ifdef EXPERIMENTAL_ARC
260 .arc_signspec = NULL,
261# endif
262 },
263# ifdef EXPERIMENTAL_ARC
264 .arc_sign = NULL,
265# endif
80a47a2c 266#endif
0756eb3c
PH
267};
268
6c1c3d1d
WB
269/* some DSN flags for use later */
270
271static int rf_list[] = {rf_notify_never, rf_notify_success,
272 rf_notify_failure, rf_notify_delay };
273
45500060 274static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB
275
276
0756eb3c
PH
277
278/* Local statics */
279
87cb4a16
JH
280static uschar *smtp_command; /* Points to last cmd for error messages */
281static uschar *mail_command; /* Points to MAIL cmd for error messages */
282static uschar *data_command = US""; /* Points to DATA cmd for error messages */
283static BOOL update_waiting; /* TRUE to update the "wait" database */
875512a3
JH
284
285/*XXX move to smtp_context */
87cb4a16 286static BOOL pipelining_active; /* current transaction is in pipe mode */
0756eb3c
PH
287
288
ee8b8090
JH
289static unsigned ehlo_response(uschar * buf, unsigned checks);
290
291
d85cdeb5
JH
292/******************************************************************************/
293
294void
295smtp_deliver_init(void)
296{
297if (!regex_PIPELINING) regex_PIPELINING =
298 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
299
300if (!regex_SIZE) regex_SIZE =
301 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
302
303if (!regex_AUTH) regex_AUTH =
304 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
305
306#ifndef DISABLE_TLS
307if (!regex_STARTTLS) regex_STARTTLS =
308 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
309#endif
310
311if (!regex_CHUNKING) regex_CHUNKING =
312 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
313
314#ifndef DISABLE_PRDR
315if (!regex_PRDR) regex_PRDR =
316 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
317#endif
318
319#ifdef SUPPORT_I18N
320if (!regex_UTF8) regex_UTF8 =
321 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
322#endif
323
324if (!regex_DSN) regex_DSN =
325 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
326
327if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
328 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
329
81344b40 330#ifndef DISABLE_PIPE_CONNECT
d85cdeb5
JH
331if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
332 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
333#endif
334}
335
336
0756eb3c
PH
337/*************************************************
338* Setup entry point *
339*************************************************/
340
341/* This function is called when the transport is about to be used,
342but before running it in a sub-process. It is used for two things:
343
344 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH
345 (2) To pass back the interface, port, protocol, and other options, for use
346 during callout verification.
0756eb3c
PH
347
348Arguments:
349 tblock pointer to the transport instance block
350 addrlist list of addresses about to be transported
351 tf if not NULL, pointer to block in which to return options
929ba01c
PH
352 uid the uid that will be set (not used)
353 gid the gid that will be set (not used)
0756eb3c
PH
354 errmsg place for error message (not used)
355
356Returns: OK always (FAIL, DEFER not used)
357*/
358
359static int
360smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 361 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c 362{
ee8b8090 363smtp_transport_options_block *ob = SOB tblock->options_block;
0756eb3c
PH
364
365errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH
366uid = uid;
367gid = gid;
0756eb3c
PH
368
369/* Pass back options if required. This interface is getting very messy. */
370
02b41d71 371if (tf)
0756eb3c
PH
372 {
373 tf->interface = ob->interface;
374 tf->port = ob->port;
375 tf->protocol = ob->protocol;
376 tf->hosts = ob->hosts;
377 tf->hosts_override = ob->hosts_override;
378 tf->hosts_randomize = ob->hosts_randomize;
379 tf->gethostbyname = ob->gethostbyname;
380 tf->qualify_single = ob->dns_qualify_single;
381 tf->search_parents = ob->dns_search_parents;
26da7e20 382 tf->helo_data = ob->helo_data;
0756eb3c
PH
383 }
384
385/* Set the fallback host list for all the addresses that don't have fallback
386host lists, provided that the local host wasn't present in the original host
387list. */
388
389if (!testflag(addrlist, af_local_host_removed))
02b41d71
JH
390 for (; addrlist; addrlist = addrlist->next)
391 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
0756eb3c
PH
392
393return OK;
394}
395
396
397
398/*************************************************
399* Initialization entry point *
400*************************************************/
401
402/* Called for each instance, after its options have been read, to
403enable consistency checks to be done, or anything else that needs
404to be set up.
405
406Argument: pointer to the transport instance block
407Returns: nothing
408*/
409
410void
411smtp_transport_init(transport_instance *tblock)
412{
ee8b8090 413smtp_transport_options_block *ob = SOB tblock->options_block;
0756eb3c
PH
414
415/* Retry_use_local_part defaults FALSE if unset */
416
417if (tblock->retry_use_local_part == TRUE_UNSET)
418 tblock->retry_use_local_part = FALSE;
419
420/* Set the default port according to the protocol */
421
ee8b8090
JH
422if (!ob->port)
423 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
424 ? US"lmtp"
425 : strcmpic(ob->protocol, US"smtps") == 0
426 ? US"smtps" : US"smtp";
0756eb3c
PH
427
428/* Set up the setup entry point, to be called before subprocesses for this
429transport. */
430
431tblock->setup = smtp_transport_setup;
432
433/* Complain if any of the timeouts are zero. */
434
435if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
436 ob->final_timeout <= 0)
437 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
438 "command, data, or final timeout value is zero for %s transport",
439 tblock->name);
440
441/* If hosts_override is set and there are local hosts, set the global
442flag that stops verify from showing router hosts. */
443
444if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
445
446/* If there are any fallback hosts listed, build a chain of host items
447for them, but do not do any lookups at this time. */
448
449host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
450}
451
452
453
454
455
456/*************************************************
457* Set delivery info into all active addresses *
458*************************************************/
459
460/* Only addresses whose status is >= PENDING are relevant. A lesser
461status means that an address is not currently being processed.
462
463Arguments:
447d236c
PH
464 addrlist points to a chain of addresses
465 errno_value to put in each address's errno field
466 msg to put in each address's message field
467 rc to put in each address's transport_return field
468 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 469 host if set, mark addrs as having used this host
895fbaf2
JH
470 smtp_greeting from peer
471 helo_response from peer
a55697ac 472 start points to timestamp of delivery start
0756eb3c
PH
473
474If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
475the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
476this particular type of timeout.
477
478Returns: nothing
479*/
480
7cd1141b
PH
481static void
482set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
a55697ac 483 BOOL pass_message, host_item * host,
895fbaf2 484#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 485 const uschar * smtp_greeting, const uschar * helo_response,
895fbaf2 486#endif
a55697ac 487 struct timeval * start
895fbaf2 488 )
0756eb3c 489{
0756eb3c 490int orvalue = 0;
a55697ac
JH
491struct timeval deliver_time;
492
0756eb3c
PH
493if (errno_value == ERRNO_CONNECTTIMEOUT)
494 {
495 errno_value = ETIMEDOUT;
496 orvalue = RTEF_CTOUT;
497 }
a55697ac
JH
498timesince(&deliver_time, start);
499
d7978c0f 500for (address_item * addr = addrlist; addr; addr = addr->next)
168dec3b 501 if (addr->transport_return >= PENDING)
447d236c 502 {
168dec3b
JH
503 addr->basic_errno = errno_value;
504 addr->more_errno |= orvalue;
a55697ac 505 addr->delivery_time = deliver_time;
02b41d71 506 if (msg)
168dec3b
JH
507 {
508 addr->message = msg;
509 if (pass_message) setflag(addr, af_pass_message);
510 }
511 addr->transport_return = rc;
512 if (host)
895fbaf2 513 {
168dec3b 514 addr->host_used = host;
895fbaf2
JH
515#ifdef EXPERIMENTAL_DSN_INFO
516 if (smtp_greeting)
517 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
518 addr->smtp_greeting = smtp_greeting;
519
520 if (helo_response)
521 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
522 addr->helo_response = helo_response;
523#endif
524 }
447d236c 525 }
0756eb3c
PH
526}
527
895fbaf2 528static void
a55697ac
JH
529set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
530 BOOL pass_message, struct timeval * start)
895fbaf2 531{
a55697ac 532set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
895fbaf2 533#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 534 NULL, NULL,
895fbaf2 535#endif
a55697ac 536 start);
895fbaf2 537}
0756eb3c
PH
538
539
540/*************************************************
541* Check an SMTP response *
542*************************************************/
543
544/* This function is given an errno code and the SMTP response buffer
545to analyse, together with the host identification for generating messages. It
546sets an appropriate message and puts the first digit of the response code into
547the yield variable. If no response was actually read, a suitable digit is
548chosen.
549
550Arguments:
447d236c
PH
551 host the current host, to get its name for messages
552 errno_value pointer to the errno value
553 more_errno from the top address for use with ERRNO_FILTER_FAIL
554 buffer the SMTP response buffer
555 yield where to put a one-digit SMTP response code
4c04137d 556 message where to put an error message
447d236c
PH
557 pass_message set TRUE if message is an SMTP response
558
559Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
560*/
561
a7538db1
JH
562static BOOL
563check_response(host_item *host, int *errno_value, int more_errno,
447d236c 564 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 565{
0d9fa8c0 566uschar * pl = pipelining_active ? US"pipelined " : US"";
e9166683 567const uschar * s;
0756eb3c
PH
568
569*yield = '4'; /* Default setting is to give a temporary error */
570
e9166683 571switch(*errno_value)
0756eb3c 572 {
e9166683
JH
573 case ETIMEDOUT: /* Handle response timeout */
574 *message = US string_sprintf("SMTP timeout after %s%s",
575 pl, smtp_command);
576 if (transport_count > 0)
577 *message = US string_sprintf("%s (%d bytes written)", *message,
578 transport_count);
579 return FALSE;
580
581 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
582 s = string_printing(buffer);
583 while (isspace(*s)) s++;
584 *message = *s == 0
585 ? string_sprintf("Malformed SMTP reply (an empty line) "
586 "in response to %s%s", pl, smtp_command)
587 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
588 pl, smtp_command, s);
589 return FALSE;
590
fc243e94
JH
591 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
592 GnuTLS and TLS1.3 */
593 *message = US"bad first read from TLS conn";
594 return TRUE;
595
e9166683
JH
596 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
597 can't send QUIT as we mustn't end the DATA. */
598 *message = string_sprintf("transport filter process failed (%d)%s",
599 more_errno,
600 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
601 return FALSE;
602
603 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
604 can't send QUIT as we mustn't end the DATA. */
605 *message =
606 string_sprintf("failed to expand headers_add or headers_remove: %s",
607 expand_string_message);
608 return FALSE;
609
610 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
f3ebb786 611 *message = US"failed to write a data block";
e9166683 612 return FALSE;
0756eb3c 613
8c5d388a 614#ifdef SUPPORT_I18N
e9166683
JH
615 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
616 *message = US"utf8 support required but not offered for forwarding";
617 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
618 return TRUE;
250b6871 619#endif
e9166683 620 }
250b6871 621
0756eb3c
PH
622/* Handle error responses from the remote mailer. */
623
624if (buffer[0] != 0)
625 {
e9166683
JH
626 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
627 "%s", pl, smtp_command, s = string_printing(buffer));
447d236c 628 *pass_message = TRUE;
0756eb3c
PH
629 *yield = buffer[0];
630 return TRUE;
631 }
632
633/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
634connection closed) case, which causes deferral. An explicit connection reset
635error has the same effect. Otherwise, put the host's identity in the message,
636leaving the errno value to be interpreted as well. In all cases, we have to
637assume the connection is now dead. */
0756eb3c 638
19b9dc85 639if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
640 {
641 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 642 *message = US string_sprintf("Remote host closed connection "
02b41d71 643 "in response to %s%s", pl, smtp_command);
0756eb3c 644 }
de6273b4
JH
645else
646 *message = US string_sprintf("%s [%s]", host->name, host->address);
0756eb3c
PH
647
648return FALSE;
649}
650
651
652
653/*************************************************
654* Write error message to logs *
655*************************************************/
656
657/* This writes to the main log and to the message log.
658
659Arguments:
0756eb3c 660 host the current host
ec62d0a9
HSHR
661 detail the current message (addr_item->message)
662 basic_errno the errno (addr_item->basic_errno)
0756eb3c
PH
663
664Returns: nothing
665*/
666
667static void
ec62d0a9 668write_logs(const host_item *host, const uschar *suffix, int basic_errno)
0756eb3c 669{
52f12a7c
JH
670gstring * message = LOGGING(outgoing_port)
671 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
584ddd64 672 host->port == PORT_NONE ? 25 : host->port)
52f12a7c 673 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
c562fd30 674
ec62d0a9 675if (suffix)
0756eb3c 676 {
52f12a7c 677 message = string_fmt_append(message, ": %s", suffix);
ec62d0a9 678 if (basic_errno > 0)
52f12a7c 679 message = string_fmt_append(message, ": %s", strerror(basic_errno));
0756eb3c
PH
680 }
681else
52f12a7c 682 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
ec62d0a9 683
52f12a7c
JH
684log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
685deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
0756eb3c
PH
686}
687
c562fd30
JH
688static void
689msglog_line(host_item * host, uschar * message)
690{
37f3dc43
JH
691deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
692 host->name, host->address, message);
c562fd30
JH
693}
694
0756eb3c
PH
695
696
0cbf2b82 697#ifndef DISABLE_EVENT
d68218c7
JH
698/*************************************************
699* Post-defer action *
700*************************************************/
701
702/* This expands an arbitrary per-transport string.
703 It might, for example, be used to write to the database log.
704
705Arguments:
d68218c7
JH
706 addr the address item containing error information
707 host the current host
78598e6a 708 evstr the event
d68218c7
JH
709
710Returns: nothing
711*/
712
713static void
78598e6a 714deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
d68218c7 715{
774ef2d7 716uschar * action = addr->transport->event_action;
55414b25 717const uschar * save_domain;
a7538db1
JH
718uschar * save_local;
719
d68218c7 720if (!action)
a7538db1 721 return;
d68218c7 722
a7538db1
JH
723save_domain = deliver_domain;
724save_local = deliver_localpart;
725
726/*XXX would ip & port already be set up? */
727deliver_host_address = string_copy(host->address);
774ef2d7
JH
728deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
729event_defer_errno = addr->basic_errno;
d68218c7
JH
730
731router_name = addr->router->name;
732transport_name = addr->transport->name;
a7538db1
JH
733deliver_domain = addr->domain;
734deliver_localpart = addr->local_part;
735
78598e6a 736(void) event_raise(action, evstr,
a7538db1
JH
737 addr->message
738 ? addr->basic_errno > 0
739 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
740 : string_copy(addr->message)
741 : addr->basic_errno > 0
742 ? string_copy(US strerror(addr->basic_errno))
743 : NULL);
744
745deliver_localpart = save_local;
746deliver_domain = save_domain;
d68218c7
JH
747router_name = transport_name = NULL;
748}
749#endif
750
0756eb3c 751/*************************************************
ee8b8090
JH
752* Reap SMTP specific responses *
753*************************************************/
754static int
755smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
756 int count)
757{
758uschar flushbuffer[4096];
759
760while (count-- > 0)
761 {
762 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
763 '2', ob->command_timeout)
764 && (errno != 0 || flushbuffer[0] == 0))
765 break;
766 }
767return count;
768}
769
770
771/* Return boolean success */
772
773static BOOL
774smtp_reap_banner(smtp_context * sx)
775{
776BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
777 '2', (SOB sx->conn_args.ob)->command_timeout);
778#ifdef EXPERIMENTAL_DSN_INFO
779sx->smtp_greeting = string_copy(sx->buffer);
780#endif
781return good_response;
782}
783
784static BOOL
785smtp_reap_ehlo(smtp_context * sx)
786{
787if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
788 (SOB sx->conn_args.ob)->command_timeout))
789 {
790 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
791 {
792#ifdef EXPERIMENTAL_DSN_INFO
793 sx->helo_response = string_copy(sx->buffer);
794#endif
795 return FALSE;
796 }
797 sx->esmtp = FALSE;
798 }
799#ifdef EXPERIMENTAL_DSN_INFO
800sx->helo_response = string_copy(sx->buffer);
801#endif
8e78571a
JH
802#ifndef DISABLE_EVENT
803(void) event_raise(sx->conn_args.tblock->event_action,
804 US"smtp:ehlo", sx->buffer);
805#endif
ee8b8090
JH
806return TRUE;
807}
808
809
810
81344b40 811#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
812static uschar *
813ehlo_cache_key(const smtp_context * sx)
814{
815host_item * host = sx->conn_args.host;
816return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
821}
822
823static void
824write_ehlo_cache_entry(const smtp_context * sx)
825{
826open_db dbblock, * dbm_file;
827
b10c87b3 828if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
829 {
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
832
cb6bd80f
JH
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
836
ee8b8090
JH
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
839 }
840}
841
842static void
843invalidate_ehlo_cache_entry(smtp_context * sx)
844{
845open_db dbblock, * dbm_file;
846
847if ( sx->early_pipe_active
b10c87b3 848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
849 {
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
853 }
854}
855
856static BOOL
857read_ehlo_cache_entry(smtp_context * sx)
858{
859open_db dbblock;
860open_db * dbm_file;
861
b10c87b3 862if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
ee8b8090
JH
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
864else
865 {
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
868
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
872 {
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
b10c87b3 875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
876 dbfn_delete(dbm_file, ehlo_resp_key);
877 }
878 else
879 {
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
d1dc7725
JH
883 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
884 er->data.cleartext_features, er->data.cleartext_auths,
885 er->data.crypted_features, er->data.crypted_auths);
ee8b8090
JH
886 return TRUE;
887 }
888 dbfn_close(dbm_file);
889 }
890return FALSE;
891}
892
893
894
895/* Return an auths bitmap for the set of AUTH methods offered by the server
896which match our authenticators. */
897
898static unsigned short
899study_ehlo_auths(smtp_context * sx)
900{
901uschar * names;
902auth_instance * au;
903uschar authnum;
904unsigned short authbits = 0;
905
906if (!sx->esmtp) return 0;
907if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
908if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
909expand_nmax = -1; /* reset */
910names = string_copyn(expand_nstring[1], expand_nlength[1]);
911
912for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
913 {
914 const uschar * list = names;
ba74fb8d
JH
915 uschar * s;
916 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
917 if (strcmpic(au->public_name, s) == 0)
ee8b8090
JH
918 { authbits |= BIT(authnum); break; }
919 }
920
921DEBUG(D_transport)
922 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
923 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
924
925if (tls_out.active.sock >= 0)
926 sx->ehlo_resp.crypted_auths = authbits;
927else
928 sx->ehlo_resp.cleartext_auths = authbits;
929return authbits;
930}
931
932
933
934
935/* Wait for and check responses for early-pipelining.
936
937Called from the lower-level smtp_read_response() function
938used for general code that assume synchronisation, if context
939flags indicate outstanding early-pipelining commands. Also
940called fom sync_responses() which handles pipelined commands.
941
942Arguments:
943 sx smtp connection context
944 countp number of outstanding responses, adjusted on return
945
946Return:
947 OK all well
fc243e94 948 DEFER error on first read of TLS'd conn
ee8b8090
JH
949 FAIL SMTP error in response
950*/
951int
952smtp_reap_early_pipe(smtp_context * sx, int * countp)
953{
954BOOL pending_BANNER = sx->pending_BANNER;
955BOOL pending_EHLO = sx->pending_EHLO;
fc243e94 956int rc = FAIL;
ee8b8090
JH
957
958sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
959sx->pending_EHLO = FALSE;
960
961if (pending_BANNER)
962 {
963 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
964 (*countp)--;
965 if (!smtp_reap_banner(sx))
966 {
967 DEBUG(D_transport) debug_printf("bad banner\n");
fc243e94 968 if (tls_out.active.sock >= 0) rc = DEFER;
ee8b8090
JH
969 goto fail;
970 }
971 }
972
973if (pending_EHLO)
974 {
975 unsigned peer_offered;
976 unsigned short authbits = 0, * ap;
977
978 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
979 (*countp)--;
980 if (!smtp_reap_ehlo(sx))
981 {
982 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
fc243e94 983 if (tls_out.active.sock >= 0) rc = DEFER;
ee8b8090
JH
984 goto fail;
985 }
986
987 /* Compare the actual EHLO response to the cached value we assumed;
988 on difference, dump or rewrite the cache and arrange for a retry. */
989
990 ap = tls_out.active.sock < 0
991 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
992
993 peer_offered = ehlo_response(sx->buffer,
9883af72 994 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
ee8b8090
JH
995 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
996 | OPTION_UTF8 | OPTION_EARLY_PIPE
997 );
998 if ( peer_offered != sx->peer_offered
999 || (authbits = study_ehlo_auths(sx)) != *ap)
1000 {
1001 HDEBUG(D_transport)
cb6bd80f
JH
1002 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1003 tls_out.active.sock < 0 ? "cleartext" : "crypted",
ee8b8090 1004 sx->peer_offered, *ap, peer_offered, authbits);
cb6bd80f
JH
1005 *(tls_out.active.sock < 0
1006 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
ee8b8090
JH
1007 *ap = authbits;
1008 if (peer_offered & OPTION_EARLY_PIPE)
1009 write_ehlo_cache_entry(sx);
1010 else
1011 invalidate_ehlo_cache_entry(sx);
1012
1013 return OK; /* just carry on */
1014 }
1015 }
1016return OK;
1017
1018fail:
1019 invalidate_ehlo_cache_entry(sx);
1020 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
fc243e94 1021 return rc;
ee8b8090
JH
1022}
1023#endif
1024
1025
1026/*************************************************
0756eb3c
PH
1027* Synchronize SMTP responses *
1028*************************************************/
1029
1030/* This function is called from smtp_deliver() to receive SMTP responses from
1031the server, and match them up with the commands to which they relate. When
1032PIPELINING is not in use, this function is called after every command, and is
1033therefore somewhat over-engineered, but it is simpler to use a single scheme
1034that works both with and without PIPELINING instead of having two separate sets
1035of code.
1036
1037The set of commands that are buffered up with pipelining may start with MAIL
1038and may end with DATA; in between are RCPT commands that correspond to the
1039addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1040etc.) are never buffered.
1041
1042Errors after MAIL or DATA abort the whole process leaving the response in the
1043buffer. After MAIL, pending responses are flushed, and the original command is
1044re-instated in big_buffer for error messages. For RCPT commands, the remote is
1045permitted to reject some recipient addresses while accepting others. However
1046certain errors clearly abort the whole process. Set the value in
1047transport_return to PENDING_OK if the address is accepted. If there is a
1048subsequent general error, it will get reset accordingly. If not, it will get
1049converted to OK at the end.
1050
1051Arguments:
df5b41e3 1052 sx smtp connection context
48c7f9e2 1053 count the number of responses to read
48c7f9e2
PH
1054 pending_DATA 0 if last command sent was not DATA
1055 +1 if previously had a good recipient
1056 -1 if not previously had a good recipient
0756eb3c
PH
1057
1058Returns: 3 if at least one address had 2xx and one had 5xx
1059 2 if at least one address had 5xx but none had 2xx
1060 1 if at least one host had a 2xx response, but none had 5xx
1061 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1062 -1 timeout while reading RCPT response
1063 -2 I/O or other non-response error for RCPT
1064 -3 DATA or MAIL failed - errno and buffer set
ee8b8090 1065 -4 banner or EHLO failed (early-pipelining)
fc243e94 1066 -5 banner or EHLO failed (early-pipelining, TLS)
0756eb3c
PH
1067*/
1068
1069static int
df5b41e3 1070sync_responses(smtp_context * sx, int count, int pending_DATA)
0756eb3c 1071{
ee8b8090
JH
1072address_item * addr = sx->sync_addr;
1073smtp_transport_options_block * ob = sx->conn_args.ob;
0756eb3c
PH
1074int yield = 0;
1075
81344b40 1076#ifndef DISABLE_PIPE_CONNECT
dca6d121 1077int rc;
fc243e94
JH
1078if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1079 return rc == FAIL ? -4 : -5;
ee8b8090
JH
1080#endif
1081
0756eb3c
PH
1082/* Handle the response for a MAIL command. On error, reinstate the original
1083command in big_buffer for error message use, and flush any further pending
1084responses before returning, except after I/O errors and timeouts. */
1085
df5b41e3 1086if (sx->pending_MAIL)
0756eb3c 1087 {
7c576fca 1088 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
0756eb3c 1089 count--;
c4639661 1090 sx->pending_MAIL = FALSE;
251b9eb4 1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
e9166683 1092 '2', ob->command_timeout))
0756eb3c 1093 {
e027f545 1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c 1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
fc243e94
JH
1096 if (errno == ERRNO_TLSFAILURE)
1097 return -5;
df5b41e3 1098 if (errno == 0 && sx->buffer[0] != 0)
0756eb3c 1099 {
e97957bc 1100 int save_errno = 0;
df5b41e3 1101 if (sx->buffer[0] == '4')
e97957bc
PH
1102 {
1103 save_errno = ERRNO_MAIL4XX;
df5b41e3 1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc 1105 }
ee8b8090 1106 count = smtp_discard_responses(sx, ob, count);
e97957bc 1107 errno = save_errno;
0756eb3c 1108 }
c562fd30
JH
1109
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1112 {
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
ee8b8090 1114 addr->host_used = sx->conn_args.host;
c562fd30
JH
1115 addr = addr->next;
1116 }
0756eb3c
PH
1117 return -3;
1118 }
1119 }
1120
1121if (pending_DATA) count--; /* Number of RCPT responses to come */
1122
1123/* Read and handle the required number of RCPT responses, matching each one up
1124with an address by scanning for the next address whose status is PENDING_DEFER.
1125*/
1126
1127while (count-- > 0)
1128 {
4c2471ca
JH
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1131 return -2;
0756eb3c
PH
1132
1133 /* The address was accepted */
ee8b8090 1134 addr->host_used = sx->conn_args.host;
0756eb3c 1135
7c576fca 1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
251b9eb4 1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
e9166683 1138 '2', ob->command_timeout))
0756eb3c
PH
1139 {
1140 yield |= 1;
1141 addr->transport_return = PENDING_OK;
1142
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
1146
1147 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
1148 {
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1150 sender_address);
1151 retry_add_item(addr, altkey, rf_delete);
0756eb3c 1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 1153 }
0756eb3c
PH
1154 }
1155
fc243e94
JH
1156 /* Error on first TLS read */
1157
1158 else if (errno == ERRNO_TLSFAILURE)
1159 return -5;
1160
0756eb3c
PH
1161 /* Timeout while reading the response */
1162
1163 else if (errno == ETIMEDOUT)
1164 {
c562fd30 1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
ee8b8090 1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
a55697ac 1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
0756eb3c 1168 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 1169 update_waiting = FALSE;
0756eb3c
PH
1170 return -1;
1171 }
1172
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1176 makes sense. */
1177
df5b41e3 1178 else if (errno != 0 || sx->buffer[0] == 0)
0756eb3c 1179 {
f3ebb786
JH
1180 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1181
1182 /* Use taint-unchecked routines for writing into big_buffer, trusting
1183 that we'll never expand it. */
1184
1185 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
ee8b8090 1186 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
f3ebb786 1187 string_from_gstring(g);
0756eb3c
PH
1188 return -2;
1189 }
1190
1191 /* Handle SMTP permanent and temporary response codes. */
1192
1193 else
1194 {
1195 addr->message =
447d236c 1196 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
ee8b8090 1197 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
df5b41e3 1198 string_printing(sx->buffer));
447d236c 1199 setflag(addr, af_pass_message);
e9166683 1200 if (!sx->verify)
ee8b8090 1201 msglog_line(sx->conn_args.host, addr->message);
0756eb3c
PH
1202
1203 /* The response was 5xx */
1204
df5b41e3 1205 if (sx->buffer[0] == '5')
0756eb3c
PH
1206 {
1207 addr->transport_return = FAIL;
1208 yield |= 2;
1209 }
1210
1211 /* The response was 4xx */
1212
1213 else
1214 {
0756eb3c
PH
1215 addr->transport_return = DEFER;
1216 addr->basic_errno = ERRNO_RCPT4XX;
df5b41e3 1217 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
0756eb3c 1218
e9166683
JH
1219 if (!sx->verify)
1220 {
0cbf2b82 1221#ifndef DISABLE_EVENT
e9166683
JH
1222 event_defer_errno = addr->more_errno;
1223 msg_event_raise(US"msg:rcpt:host:defer", addr);
5ef5dd52 1224#endif
c4639661
JH
1225 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1226 start point for another MAIL command. */
5ef5dd52 1227
c4639661
JH
1228 if (addr->more_errno >> 8 == 52 && yield & 3)
1229 {
1230 if (!sx->RCPT_452)
1231 {
1232 DEBUG(D_transport)
1233 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1234 sx->RCPT_452 = TRUE;
1235 sx->next_addr = addr;
1236 }
1237 addr->transport_return = PENDING_DEFER;
1238 addr->basic_errno = 0;
1239 }
1240 else
1241 {
1242 /* Log temporary errors if there are more hosts to be tried.
1243 If not, log this last one in the == line. */
1244
1245 if (sx->conn_args.host->next)
1246 if (LOGGING(outgoing_port))
1247 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1248 sx->conn_args.host->address,
1249 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1250 else
1251 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1252 sx->conn_args.host->address, addr->message);
0756eb3c 1253
0cbf2b82 1254#ifndef DISABLE_EVENT
c4639661
JH
1255 else
1256 msg_event_raise(US"msg:rcpt:defer", addr);
5ef5dd52
JB
1257#endif
1258
c4639661
JH
1259 /* Do not put this message on the list of those waiting for specific
1260 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 1261
c4639661 1262 update_waiting = FALSE;
0756eb3c 1263
c4639661
JH
1264 /* Add a retry item for the address so that it doesn't get tried again
1265 too soon. If address_retry_include_sender is true, add the sender address
1266 to the retry key. */
0756eb3c 1267
c4639661
JH
1268 retry_add_item(addr,
1269 ob->address_retry_include_sender
1270 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1271 : addr->address_retry_key,
1272 0);
1273 }
e9166683 1274 }
0756eb3c
PH
1275 }
1276 }
1277 } /* Loop for next RCPT response */
1278
1279/* Update where to start at for the next block of responses, unless we
1280have already handled all the addresses. */
1281
e9166683 1282if (addr) sx->sync_addr = addr->next;
0756eb3c
PH
1283
1284/* Handle a response to DATA. If we have not had any good recipients, either
1285previously or in this block, the response is ignored. */
1286
7c576fca 1287if (pending_DATA != 0)
0756eb3c 1288 {
7c576fca 1289 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
251b9eb4 1290 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
7c576fca 1291 '3', ob->command_timeout))
e97957bc 1292 {
7c576fca
JH
1293 int code;
1294 uschar *msg;
1295 BOOL pass_message;
fc243e94
JH
1296
1297 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1298 return -5;
1299
7c576fca 1300 if (pending_DATA > 0 || (yield & 1) != 0)
e97957bc 1301 {
7c576fca
JH
1302 if (errno == 0 && sx->buffer[0] == '4')
1303 {
1304 errno = ERRNO_DATA4XX;
1305 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1306 }
1307 return -3;
e97957bc 1308 }
ee8b8090 1309 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
7c576fca
JH
1310 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1311 "is in use and there were no good recipients\n", msg);
e97957bc 1312 }
0756eb3c
PH
1313 }
1314
1315/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1316present) received 3xx. If any RCPTs were handled and yielded anything other
1317than 4xx, yield will be set non-zero. */
1318
1319return yield;
1320}
1321
1322
1323
ee8b8090
JH
1324
1325
1326/* Try an authenticator's client entry */
1327
1328static int
1329try_authenticator(smtp_context * sx, auth_instance * au)
1330{
1331smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1332host_item * host = sx->conn_args.host; /* host to deliver to */
1333int rc;
1334
1335sx->outblock.authenticating = TRUE;
1336rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1337 sx->buffer, sizeof(sx->buffer));
1338sx->outblock.authenticating = FALSE;
1339DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1340
1341/* A temporary authentication failure must hold up delivery to
1342this host. After a permanent authentication failure, we carry on
1343to try other authentication methods. If all fail hard, try to
1344deliver the message unauthenticated unless require_auth was set. */
1345
1346switch(rc)
1347 {
1348 case OK:
1349 f.smtp_authenticated = TRUE; /* stops the outer loop */
1350 client_authenticator = au->name;
1351 if (au->set_client_id)
1352 client_authenticated_id = expand_string(au->set_client_id);
1353 break;
1354
1355 /* Failure after writing a command */
1356
1357 case FAIL_SEND:
1358 return FAIL_SEND;
1359
1360 /* Failure after reading a response */
1361
1362 case FAIL:
1363 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1364 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1365 au->name, host->name, host->address, sx->buffer);
1366 break;
1367
1368 /* Failure by some other means. In effect, the authenticator
1369 decided it wasn't prepared to handle this case. Typically this
1370 is the result of "fail" in an expansion string. Do we need to
1371 log anything here? Feb 2006: a message is now put in the buffer
1372 if logging is required. */
1373
1374 case CANCELLED:
1375 if (*sx->buffer != 0)
1376 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1377 "authentication H=%s [%s] %s", au->name, host->name,
1378 host->address, sx->buffer);
1379 break;
1380
1381 /* Internal problem, message in buffer. */
1382
1383 case ERROR:
1384 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
a55697ac 1385 DEFER, FALSE, &sx->delivery_start);
ee8b8090
JH
1386 return ERROR;
1387 }
1388return OK;
1389}
1390
1391
1392
1393
1394/* Do the client side of smtp-level authentication.
1395
fcc8e047 1396Arguments:
ee8b8090
JH
1397 sx smtp connection context
1398
1399sx->buffer should have the EHLO response from server (gets overwritten)
fcc8e047
JH
1400
1401Returns:
1402 OK Success, or failed (but not required): global "smtp_authenticated" set
1403 DEFER Failed authentication (and was required)
1404 ERROR Internal problem
1405
1406 FAIL_SEND Failed communications - transmit
1407 FAIL - response
1408*/
1409
251b9eb4 1410static int
ee8b8090 1411smtp_auth(smtp_context * sx)
fcc8e047 1412{
ee8b8090
JH
1413host_item * host = sx->conn_args.host; /* host to deliver to */
1414smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1415int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
81344b40 1416#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1417unsigned short authbits = tls_out.active.sock >= 0
1418 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1419#endif
1420uschar * fail_reason = US"server did not advertise AUTH support";
fcc8e047 1421
8768d548 1422f.smtp_authenticated = FALSE;
a7538db1 1423client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
fcc8e047 1424
ee8b8090
JH
1425if (!regex_AUTH)
1426 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1427
1428/* Is the server offering AUTH? */
fcc8e047 1429
ee8b8090
JH
1430if ( sx->esmtp
1431 &&
81344b40 1432#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1433 sx->early_pipe_active ? authbits
1434 :
1435#endif
1436 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1437 )
a7538db1 1438 {
ee8b8090 1439 uschar * names = NULL;
a7538db1 1440 expand_nmax = -1; /* reset */
fcc8e047 1441
81344b40 1442#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1443 if (!sx->early_pipe_active)
1444#endif
1445 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1446
a7538db1 1447 /* Must not do this check until after we have saved the result of the
ee8b8090 1448 regex match above as the check could be another RE. */
fcc8e047 1449
ee8b8090
JH
1450 if ( require_auth == OK
1451 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
a7538db1 1452 {
a7538db1 1453 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
ee8b8090
JH
1454 fail_reason = US"no common mechanisms were found";
1455
81344b40 1456#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1457 if (sx->early_pipe_active)
1458 {
1459 /* Scan our authenticators (which support use by a client and were offered
1460 by the server (checked at cache-write time)), not suppressed by
1461 client_condition. If one is found, attempt to authenticate by calling its
1462 client function. We are limited to supporting up to 16 authenticator
1463 public-names by the number of bits in a short. */
1464
dca6d121 1465 auth_instance * au;
ee8b8090
JH
1466 uschar bitnum;
1467 int rc;
1468
1469 for (bitnum = 0, au = auths;
1470 !f.smtp_authenticated && au && bitnum < 16;
1471 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1472 {
1473 if ( au->client_condition
1474 && !expand_check_condition(au->client_condition, au->name,
1475 US"client authenticator"))
1476 {
1477 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1478 au->name, "client_condition is false");
1479 continue;
1480 }
1481
1482 /* Found data for a listed mechanism. Call its client entry. Set
1483 a flag in the outblock so that data is overwritten after sending so
1484 that reflections don't show it. */
1485
1486 fail_reason = US"authentication attempt(s) failed";
1487
1488 if ((rc = try_authenticator(sx, au)) != OK)
1489 return rc;
1490 }
1491 }
1492 else
1493#endif
fcc8e047 1494
a7538db1
JH
1495 /* Scan the configured authenticators looking for one which is configured
1496 for use as a client, which is not suppressed by client_condition, and
1497 whose name matches an authentication mechanism supported by the server.
1498 If one is found, attempt to authenticate by calling its client function.
1499 */
fcc8e047 1500
d7978c0f 1501 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
a7538db1
JH
1502 {
1503 uschar *p = names;
ee8b8090
JH
1504
1505 if ( !au->client
1506 || ( au->client_condition
1507 && !expand_check_condition(au->client_condition, au->name,
1508 US"client authenticator")))
a7538db1
JH
1509 {
1510 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1511 au->name,
1512 (au->client)? "client_condition is false" :
1513 "not configured as a client");
1514 continue;
1515 }
fcc8e047 1516
a7538db1 1517 /* Loop to scan supported server mechanisms */
fcc8e047 1518
cab0c277 1519 while (*p)
a7538db1 1520 {
a7538db1 1521 int len = Ustrlen(au->public_name);
ee8b8090
JH
1522 int rc;
1523
a7538db1 1524 while (isspace(*p)) p++;
fcc8e047 1525
a7538db1
JH
1526 if (strncmpic(au->public_name, p, len) != 0 ||
1527 (p[len] != 0 && !isspace(p[len])))
1528 {
1529 while (*p != 0 && !isspace(*p)) p++;
1530 continue;
1531 }
fcc8e047 1532
a7538db1
JH
1533 /* Found data for a listed mechanism. Call its client entry. Set
1534 a flag in the outblock so that data is overwritten after sending so
1535 that reflections don't show it. */
fcc8e047 1536
a7538db1 1537 fail_reason = US"authentication attempt(s) failed";
a7538db1 1538
ee8b8090
JH
1539 if ((rc = try_authenticator(sx, au)) != OK)
1540 return rc;
fcc8e047 1541
a7538db1
JH
1542 break; /* If not authenticated, try next authenticator */
1543 } /* Loop for scanning supported server mechanisms */
1544 } /* Loop for further authenticators */
fcc8e047 1545 }
a7538db1 1546 }
fcc8e047 1547
a7538db1 1548/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1549
8768d548 1550if (require_auth == OK && !f.smtp_authenticated)
a7538db1 1551 {
bf624a64 1552 invalidate_ehlo_cache_entry(sx);
251b9eb4 1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
a7538db1 1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
a55697ac 1555 FALSE, &sx->delivery_start);
a7538db1
JH
1556 return DEFER;
1557 }
4d8d62b9 1558
a7538db1 1559return OK;
fcc8e047
JH
1560}
1561
1562
1563/* Construct AUTH appendix string for MAIL TO */
1564/*
1565Arguments
a55697ac
JH
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
fcc8e047 1568 addrlist chain of potential addresses to deliver
fcc8e047 1569
8768d548 1570Globals f.smtp_authenticated
fcc8e047
JH
1571 client_authenticated_sender
1572Return True on error, otherwise buffer has (possibly empty) terminated string
1573*/
1574
f3ebb786 1575static BOOL
a55697ac 1576smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
fcc8e047 1577{
a55697ac 1578smtp_transport_options_block * ob = sx->conn_args.ob;
f3ebb786 1579uschar * local_authenticated_sender = authenticated_sender;
fcc8e047
JH
1580
1581#ifdef notdef
a55697ac
JH
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
fcc8e047
JH
1584#endif
1585
f3ebb786 1586if (ob->authenticated_sender)
fcc8e047 1587 {
a55697ac 1588 uschar * new = expand_string(ob->authenticated_sender);
f3ebb786 1589 if (!new)
fcc8e047 1590 {
8768d548 1591 if (!f.expand_string_forcedfail)
fcc8e047
JH
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
a55697ac 1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
fcc8e047
JH
1596 return TRUE;
1597 }
1598 }
a55697ac
JH
1599 else if (*new)
1600 local_authenticated_sender = new;
fcc8e047
JH
1601 }
1602
1603/* Add the authenticated sender address if present */
1604
f3ebb786
JH
1605if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
fcc8e047 1607 {
a55697ac 1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
fcc8e047 1609 auth_xtextencode(local_authenticated_sender,
f3ebb786 1610 Ustrlen(local_authenticated_sender)));
fcc8e047
JH
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613else
a55697ac 1614 *p = 0;
fcc8e047
JH
1615
1616return FALSE;
1617}
1618
1619
1620
a39bd74d
JB
1621typedef struct smtp_compare_s
1622{
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625} smtp_compare_t;
1626
d093f8e5
JH
1627
1628/* Create a unique string that identifies this message, it is based on
1629sender_address, helo_data and tls_certificate if enabled.
1630*/
a39bd74d
JB
1631
1632static uschar *
1633smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634{
1635address_item * addr1;
1636uschar * if1 = US"";
1637uschar * helo1 = US"";
01603eec 1638#ifndef DISABLE_TLS
a39bd74d
JB
1639uschar * tlsc1 = US"";
1640#endif
1641uschar * save_sender_address = sender_address;
1642uschar * local_identity = NULL;
ee8b8090 1643smtp_transport_options_block * ob = SOB tblock->options_block;
a39bd74d
JB
1644
1645sender_address = sender;
1646
1647addr1 = deliver_make_addr (sender, TRUE);
1648deliver_set_expansions(addr1);
1649
1650if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
01603eec 1656#ifndef DISABLE_TLS
a39bd74d
JB
1657if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660#else
1661local_identity = string_sprintf ("%s^%s", if1, helo1);
1662#endif
1663
1664deliver_set_expansions(NULL);
1665sender_address = save_sender_address;
1666
1667return local_identity;
1668}
1669
1670
1671
1672/* This routine is a callback that is called from transport_check_waiting.
1673This function will evaluate the incoming message versus the previous
1674message. If the incoming message is using a different local identity then
1675we will veto this new message. */
1676
1677static BOOL
1678smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679{
dadff1d4
HSHR
1680uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684current_local_identity =
a39bd74d 1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1686
dadff1d4 1687if (!(new_sender_address = deliver_get_sender_address(message_id)))
96c81511 1688 return FALSE;
dadff1d4
HSHR
1689
1690message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1692
1693return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694}
1695
1696
1697
8ac90765
JH
1698static unsigned
1699ehlo_response(uschar * buf, unsigned checks)
9094b84b 1700{
e9166683
JH
1701size_t bsize = Ustrlen(buf);
1702
ee8b8090 1703/* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
8ac90765 1704
01603eec 1705#ifndef DISABLE_TLS
ee8b8090
JH
1706if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1708#endif
ee8b8090 1709 checks &= ~OPTION_TLS;
9094b84b 1710
14de8063 1711if ( checks & OPTION_IGNQ
ff5aac2b
JH
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
14de8063 1714 checks &= ~OPTION_IGNQ;
9094b84b 1715
14de8063 1716if ( checks & OPTION_CHUNKING
f98442df 1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1718 checks &= ~OPTION_CHUNKING;
f98442df 1719
9094b84b 1720#ifndef DISABLE_PRDR
14de8063 1721if ( checks & OPTION_PRDR
ff5aac2b 1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1723#endif
ee8b8090 1724 checks &= ~OPTION_PRDR;
9094b84b
JH
1725
1726#ifdef SUPPORT_I18N
14de8063 1727if ( checks & OPTION_UTF8
ff5aac2b 1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1729#endif
ee8b8090 1730 checks &= ~OPTION_UTF8;
9094b84b 1731
14de8063 1732if ( checks & OPTION_DSN
ff5aac2b 1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1734 checks &= ~OPTION_DSN;
9094b84b 1735
14de8063 1736if ( checks & OPTION_PIPE
ff5aac2b
JH
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
14de8063 1739 checks &= ~OPTION_PIPE;
9094b84b 1740
14de8063 1741if ( checks & OPTION_SIZE
ff5aac2b 1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1743 checks &= ~OPTION_SIZE;
9094b84b 1744
81344b40 1745#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1746if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749#endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752/* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
9094b84b
JH
1753return checks;
1754}
1755
1756
6d5c916c
JH
1757
1758/* Callback for emitting a BDAT data chunk header.
6d5c916c 1759
e027f545
JH
1760If given a nonzero size, first flush any buffered SMTP commands
1761then emit the command.
1762
d2aa036b
JH
1763Reap previous SMTP command responses if requested, and always reap
1764the response from a previous BDAT command.
1765
1766Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
6d5c916c 1772
fc243e94
JH
1773Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
6d5c916c
JH
1776*/
1777
1778static int
d2aa036b
JH
1779smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
6d5c916c 1781{
ee8b8090 1782smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
e9166683 1783smtp_context * sx = tctx->smtp_context;
e027f545
JH
1784int cmd_count = 0;
1785int prev_cmd_count;
6d5c916c 1786
4e910c01
JH
1787/* Write SMTP chunk header command. If not reaping responses, note that
1788there may be more writes (like, the chunk data) done soon. */
6d5c916c 1789
e027f545 1790if (chunk_size > 0)
87cb4a16 1791 {
81344b40 1792#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794#endif
251b9eb4 1795 if((cmd_count = smtp_write_command(sx,
4e910c01
JH
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
e027f545 1798 ) < 0) return ERROR;
87cb4a16
JH
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
81344b40 1801#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808#endif
87cb4a16 1809 }
e027f545 1810
e9166683 1811prev_cmd_count = cmd_count += sx->cmd_count;
6d5c916c 1812
e027f545 1813/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1814
e027f545
JH
1815if (chunk_size > 0)
1816 prev_cmd_count--;
e9166683 1817if (sx->pending_BDAT)
e027f545 1818 prev_cmd_count--;
6d5c916c 1819
e027f545 1820if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1821 {
58fc5fb2
JH
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1824
e9166683 1825 switch(sync_responses(sx, prev_cmd_count, 0))
e027f545
JH
1826 {
1827 case 1: /* 2xx (only) => OK */
e9166683
JH
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e027f545
JH
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
fc243e94
JH
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
81344b40 1834#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836#endif
fc243e94 1837 case -1: /* Timeout on RCPT */
e027f545
JH
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
e9166683 1841 if (!sx->pending_BDAT)
e027f545 1842 pipelining_active = FALSE;
6d5c916c 1843 }
e027f545 1844
58fc5fb2 1845/* Reap response for an outstanding BDAT */
e027f545 1846
e9166683 1847if (sx->pending_BDAT)
e027f545 1848 {
58fc5fb2
JH
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
251b9eb4 1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
e027f545
JH
1852 ob->command_timeout))
1853 {
e9166683 1854 if (errno == 0 && sx->buffer[0] == '4')
e027f545
JH
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
36e55f49 1857 sx->addrlist->more_errno |=
e9166683 1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e027f545
JH
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
e9166683 1863 sx->pending_BDAT = FALSE;
e027f545
JH
1864 pipelining_active = FALSE;
1865 }
1866else if (chunk_size > 0)
e9166683 1867 sx->pending_BDAT = TRUE;
e027f545
JH
1868
1869
e9166683 1870sx->cmd_count = cmd_count;
e027f545 1871return OK;
6d5c916c
JH
1872}
1873
1874
1875
ee8b8090
JH
1876
1877
0756eb3c 1878/*************************************************
d093f8e5 1879* Make connection for given message *
0756eb3c
PH
1880*************************************************/
1881
d093f8e5
JH
1882/*
1883Arguments:
1884 ctx connection context
d093f8e5
JH
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
d093f8e5
JH
1887
1888Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896*/
1897int
e9166683 1898smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
d093f8e5 1899{
ee8b8090 1900smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
d093f8e5 1901BOOL pass_message = FALSE;
d093f8e5 1902uschar * message = NULL;
d093f8e5 1903int yield = OK;
01603eec 1904#ifndef DISABLE_TLS
fc243e94
JH
1905uschar * tls_errstr;
1906#endif
d093f8e5 1907
ee8b8090 1908sx->conn_args.ob = ob;
d093f8e5 1909
ee8b8090
JH
1910sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
de41aff0 1912/* sx->ok = FALSE; */
d093f8e5
JH
1913sx->send_rset = TRUE;
1914sx->send_quit = TRUE;
1915sx->setting_up = TRUE;
1916sx->esmtp = TRUE;
de41aff0 1917/* sx->esmtp_sent = FALSE; */
59a286ef 1918#ifdef SUPPORT_I18N
de41aff0 1919/* sx->utf8_needed = FALSE; */
59a286ef 1920#endif
d093f8e5 1921sx->dsn_all_lasthop = TRUE;
21ee816d 1922#ifdef SUPPORT_DANE
de41aff0 1923/* sx->conn_args.dane = FALSE; */
8ac90765 1924sx->dane_required =
ee8b8090
JH
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926#endif
81344b40 1927#ifndef DISABLE_PIPE_CONNECT
de41aff0
JH
1928/* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929/* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930/* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
d093f8e5
JH
1931#endif
1932
ee8b8090 1933if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
de41aff0
JH
1934/* sx->peer_offered = 0; */
1935/* sx->avoid_option = 0; */
d093f8e5 1936sx->igquotstr = US"";
ee8b8090 1937if (!sx->helo_data) sx->helo_data = ob->helo_data;
d093f8e5 1938#ifdef EXPERIMENTAL_DSN_INFO
de41aff0
JH
1939/* sx->smtp_greeting = NULL; */
1940/* sx->helo_response = NULL; */
59a286ef
JH
1941#endif
1942
0756eb3c 1943smtp_command = US"initial connection";
de41aff0 1944/* sx->buffer[0] = '\0'; */
0756eb3c
PH
1945
1946/* Set up the buffer for reading SMTP response packets. */
1947
d093f8e5
JH
1948sx->inblock.buffer = sx->inbuffer;
1949sx->inblock.buffersize = sizeof(sx->inbuffer);
1950sx->inblock.ptr = sx->inbuffer;
1951sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1952
1953/* Set up the buffer for holding SMTP commands while pipelining */
1954
d093f8e5
JH
1955sx->outblock.buffer = sx->outbuffer;
1956sx->outblock.buffersize = sizeof(sx->outbuffer);
1957sx->outblock.ptr = sx->outbuffer;
de41aff0
JH
1958/* sx->outblock.cmd_count = 0; */
1959/* sx->outblock.authenticating = FALSE; */
1960/* sx->outblock.conn_args = NULL; */
0756eb3c 1961
6c512171
PH
1962/* Reset the parameters of a TLS session. */
1963
817d9f57
JH
1964tls_out.bits = 0;
1965tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1966tls_out.ourcert = NULL;
1967tls_out.peercert = NULL;
817d9f57 1968tls_out.peerdn = NULL;
de517fd3 1969#ifdef USE_OPENSSL
817d9f57 1970tls_out.sni = NULL;
5b456975 1971#endif
018058b2 1972tls_out.ocsp = OCSP_NOT_REQ;
b10c87b3
JH
1973#ifdef EXPERIMENTAL_TLS_RESUME
1974tls_out.resumption = 0;
1975#endif
da40b1ec 1976tls_out.ver = NULL;
6c512171 1977
35aba663
JH
1978/* Flip the legacy TLS-related variables over to the outbound set in case
1979they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1980afterward (when being used by a transport) as we're in a subprocess.
1981For verify, unflipped once the callout is dealt with */
35aba663
JH
1982
1983tls_modify_variables(&tls_out);
1984
01603eec 1985#ifdef DISABLE_TLS
d093f8e5 1986if (sx->smtps)
061b7ebd 1987 {
d093f8e5 1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
a55697ac 1989 DEFER, FALSE, &sx->delivery_start);
018058b2 1990 return ERROR;
061b7ebd
PP
1991 }
1992#endif
1993
0756eb3c
PH
1994/* Make a connection to the host if this isn't a continued delivery, and handle
1995the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996specially so they can be identified for retries. */
1997
58c30e47 1998if (!continue_hostname)
0756eb3c 1999 {
e9166683 2000 if (sx->verify)
ee8b8090 2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
02b41d71 2002
ee8b8090 2003 /* Get the actual port the connection will use, into sx->conn_args.host */
4311097e 2004
ee8b8090 2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
0756eb3c 2006
21ee816d 2007#ifdef SUPPORT_DANE
58c30e47 2008 /* Do TLSA lookup for DANE */
0e66b3b6 2009 {
0e66b3b6
JH
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
ee8b8090 2013 if (sx->conn_args.host->dnssec == DS_YES)
0e66b3b6 2014 {
81a559c8 2015 int rc;
d093f8e5 2016 if( sx->dane_required
ee8b8090 2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
0e66b3b6 2018 )
c05bdbd6 2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
4b0fe319 2020 {
c05bdbd6 2021 case OK: sx->conn_args.dane = TRUE;
ee8b8090 2022 ob->tls_tempfail_tryclear = FALSE;
58c30e47 2023 break;
2d5fdd53 2024 case FAIL_FORCED: break;
d093f8e5 2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53 2026 string_sprintf("DANE error: tlsa lookup %s",
aeb65e91 2027 rc_to_string(rc)),
a55697ac 2028 rc, FALSE, &sx->delivery_start);
8d3dc239 2029# ifndef DISABLE_EVENT
ee8b8090 2030 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd
JH
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
8d3dc239 2033# endif
2d5fdd53 2034 return rc;
4b0fe319 2035 }
0e66b3b6 2036 }
d093f8e5 2037 else if (sx->dane_required)
0e66b3b6 2038 {
d093f8e5 2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
ee8b8090 2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
a55697ac 2041 FAIL, FALSE, &sx->delivery_start);
8d3dc239 2042# ifndef DISABLE_EVENT
ee8b8090 2043 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd 2044 US"dane:fail", US"dane-required");
8d3dc239 2045# endif
4b0fe319 2046 return FAIL;
0e66b3b6 2047 }
0e66b3b6
JH
2048 }
2049#endif /*DANE*/
2050
58c30e47
JH
2051 /* Make the TCP connection */
2052
74f1a423
JH
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
ee8b8090 2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
58c30e47 2056
81344b40 2057#ifndef DISABLE_PIPE_CONNECT
fd6e2d18
JH
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
58c30e47 2068 {
fd6e2d18
JH
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
58c30e47 2078 }
fd6e2d18
JH
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
58c30e47 2081
4ca005cd 2082PIPE_CONNECT_RETRY:
ee8b8090
JH
2083 if (sx->early_pipe_active)
2084 sx->outblock.conn_args = &sx->conn_args;
2085 else
2086#endif
2087 {
2088 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 {
ee8b8090
JH
2090 set_errno_nohost(sx->addrlist,
2091 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
b471ea6f 2092 sx->verify ? US strerror(errno) : NULL,
a55697ac 2093 DEFER, FALSE, &sx->delivery_start);
ee8b8090
JH
2094 sx->send_quit = FALSE;
2095 return DEFER;
2096 }
2097 }
41c7c167
PH
2098 /* Expand the greeting message while waiting for the initial response. (Makes
2099 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2100 delayed till here so that $sending_interface and $sending_port are set. */
ee8b8090
JH
2101/*XXX early-pipe: they still will not be. Is there any way to find out what they
2102will be? Somehow I doubt it. */
41c7c167 2103
02b41d71
JH
2104 if (sx->helo_data)
2105 if (!(sx->helo_data = expand_string(sx->helo_data)))
e9166683 2106 if (sx->verify)
02b41d71
JH
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "<%s>: failed to expand transport's helo_data value for callout: %s",
2109 sx->addrlist->address, expand_string_message);
2110
8c5d388a 2111#ifdef SUPPORT_I18N
d093f8e5 2112 if (sx->helo_data)
810d16ad 2113 {
02b41d71
JH
2114 expand_string_message = NULL;
2115 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2116 &expand_string_message)),
2117 expand_string_message)
e9166683 2118 if (sx->verify)
02b41d71
JH
2119 log_write(0, LOG_MAIN|LOG_PANIC,
2120 "<%s>: failed to expand transport's helo_data value for callout: %s",
2121 sx->addrlist->address, expand_string_message);
2122 else
2123 sx->helo_data = NULL;
810d16ad
JH
2124 }
2125#endif
41c7c167 2126
0756eb3c
PH
2127 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2128 is nevertheless a reasonably clean way of programming this kind of logic,
2129 where you want to escape on any error. */
2130
d093f8e5 2131 if (!sx->smtps)
061b7ebd 2132 {
81344b40 2133#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2134 if (sx->early_pipe_active)
2135 {
2136 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2137 sx->outblock.cmd_count = 1;
2138 }
2139 else
8d330698 2140#endif
ee8b8090
JH
2141 {
2142#ifdef TCP_QUICKACK
2143 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2144 sizeof(off));
895fbaf2 2145#endif
ee8b8090
JH
2146 if (!smtp_reap_banner(sx))
2147 goto RESPONSE_FAILED;
2148 }
0756eb3c 2149
0cbf2b82 2150#ifndef DISABLE_EVENT
b30275b8 2151 {
805c9d53 2152 uschar * s;
ee8b8090
JH
2153 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2154 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2155 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 2156 if (s)
a7538db1 2157 {
d093f8e5 2158 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 2159 string_sprintf("deferred by smtp:connect event expansion: %s", s),
a55697ac 2160 DEFER, FALSE, &sx->delivery_start);
a7538db1
JH
2161 yield = DEFER;
2162 goto SEND_QUIT;
2163 }
b30275b8 2164 }
a7538db1
JH
2165#endif
2166
061b7ebd
PP
2167 /* Now check if the helo_data expansion went well, and sign off cleanly if
2168 it didn't. */
41c7c167 2169
d093f8e5 2170 if (!sx->helo_data)
061b7ebd 2171 {
d093f8e5 2172 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 2173 expand_string_message);
a55697ac 2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
061b7ebd
PP
2175 yield = DEFER;
2176 goto SEND_QUIT;
2177 }
41c7c167
PH
2178 }
2179
0756eb3c 2180/** Debugging without sending a message
d093f8e5 2181sx->addrlist->transport_return = DEFER;
0756eb3c
PH
2182goto SEND_QUIT;
2183**/
2184
2185 /* Errors that occur after this point follow an SMTP command, which is
2186 left in big_buffer by smtp_write_command() for use in error messages. */
2187
2188 smtp_command = big_buffer;
2189
2190 /* Tell the remote who we are...
2191
2192 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2193 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2194 greeting is of this form. The assumption was that the far end supports it
2195 properly... but experience shows that there are some that give 5xx responses,
2196 even though the banner includes "ESMTP" (there's a bloody-minded one that
2197 says "ESMTP not spoken here"). Cope with that case.
2198
2199 September 2000: Time has passed, and it seems reasonable now to always send
2200 EHLO at the start. It is also convenient to make the change while installing
2201 the TLS stuff.
2202
2203 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2204 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2205 would be no way to send out the mails, so there is now a host list
2206 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2207 PIPELINING problem as well. Maybe it can also be useful to cure other
2208 problems with broken servers.
2209
2210 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2211 Then somebody tried it with a Microsoft mailer... It seems that all other
2212 mailers use upper case for some reason (the RFC is quite clear about case
2213 independence) so, for peace of mind, I gave in. */
2214
ee8b8090 2215 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
0756eb3c 2216
061b7ebd
PP
2217 /* Alas; be careful, since this goto is not an error-out, so conceivably
2218 we might set data between here and the target which we assume to exist
2219 and be usable. I can see this coming back to bite us. */
01603eec 2220#ifndef DISABLE_TLS
d093f8e5 2221 if (sx->smtps)
061b7ebd 2222 {
14de8063 2223 smtp_peer_options |= OPTION_TLS;
061b7ebd 2224 suppress_tls = FALSE;
ee8b8090 2225 ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
2226 smtp_command = US"SSL-on-connect";
2227 goto TLS_NEGOTIATE;
2228 }
a7538db1 2229#endif
061b7ebd 2230
d093f8e5 2231 if (sx->esmtp)
0756eb3c 2232 {
ee8b8090 2233 if (smtp_write_command(sx,
81344b40 2234#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2235 sx->early_pipe_active ? SCMD_BUFFER :
2236#endif
2237 SCMD_FLUSH,
2238 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 2239 goto SEND_FAILED;
d093f8e5 2240 sx->esmtp_sent = TRUE;
ee8b8090 2241
81344b40 2242#ifndef DISABLE_PIPE_CONNECT
ee8b8090 2243 if (sx->early_pipe_active)
0756eb3c 2244 {
ee8b8090
JH
2245 sx->pending_EHLO = TRUE;
2246
2247 /* If we have too many authenticators to handle and might need to AUTH
2248 for this transport, pipeline no further as we will need the
2249 list of auth methods offered. Reap the banner and EHLO. */
2250
2251 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2252 && f.smtp_in_early_pipe_no_auth)
895fbaf2 2253 {
ee8b8090
JH
2254 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2255 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 goto SEND_FAILED;
2257 if (sync_responses(sx, 2, 0) != 0)
2258 {
2259 HDEBUG(D_transport)
2260 debug_printf("failed reaping pipelined cmd responses\n");
2261 goto RESPONSE_FAILED;
2262 }
2263 sx->early_pipe_active = FALSE;
895fbaf2 2264 }
0756eb3c 2265 }
ee8b8090 2266 else
895fbaf2 2267#endif
ee8b8090
JH
2268 if (!smtp_reap_ehlo(sx))
2269 goto RESPONSE_FAILED;
0756eb3c
PH
2270 }
2271 else
0756eb3c
PH
2272 DEBUG(D_transport)
2273 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 2274
81344b40 2275#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2276 if (!sx->early_pipe_active)
2277#endif
2278 if (!sx->esmtp)
2279 {
2280 BOOL good_response;
2281 int n = sizeof(sx->buffer);
2282 uschar * rsp = sx->buffer;
a57ce043 2283
ee8b8090
JH
2284 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2285 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 2286
ee8b8090
JH
2287 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 goto SEND_FAILED;
2289 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
895fbaf2 2290#ifdef EXPERIMENTAL_DSN_INFO
ee8b8090 2291 sx->helo_response = string_copy(rsp);
895fbaf2 2292#endif
ee8b8090 2293 if (!good_response)
a57ce043 2294 {
ee8b8090
JH
2295 /* Handle special logging for a closed connection after HELO
2296 when had previously sent EHLO */
2297
2298 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 {
2300 errno = ERRNO_SMTPCLOSED;
2301 goto EHLOHELO_FAILED;
2302 }
2303 memmove(sx->buffer, rsp, Ustrlen(rsp));
2304 goto RESPONSE_FAILED;
a57ce043 2305 }
a57ce043 2306 }
2d14f397 2307
d093f8e5 2308 if (sx->esmtp || sx->lmtp)
2d14f397 2309 {
81344b40 2310#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2311 if (!sx->early_pipe_active)
2312#endif
2313 {
2314 sx->peer_offered = ehlo_response(sx->buffer,
2315 OPTION_TLS /* others checked later */
81344b40 2316#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2317 | (sx->early_pipe_ok
2318 ? OPTION_IGNQ
2319 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2320#ifdef SUPPORT_I18N
2321 | OPTION_UTF8
2322#endif
2323 | OPTION_EARLY_PIPE
2324 : 0
2325 )
2326#endif
2327 );
81344b40 2328#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2329 if (sx->early_pipe_ok)
2330 {
2331 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332
2333 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 {
2336 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2337 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2338 write_ehlo_cache_entry(sx);
2339 }
2340 }
2341#endif
2342 }
f1513293 2343
0756eb3c
PH
2344 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2345
01603eec 2346#ifndef DISABLE_TLS
14de8063 2347 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
7ade712c 2348#endif
2d14f397 2349 }
0756eb3c
PH
2350 }
2351
57cc2785
JH
2352/* For continuing deliveries down the same channel, having re-exec'd the socket
2353is the standard input; for a socket held open from verify it is recorded
2354in the cutthrough context block. Either way we don't need to redo EHLO here
2355(but may need to do so for TLS - see below).
2356Set up the pointer to where subsequent commands will be left, for
2d14f397 2357error messages. Note that smtp_peer_options will have been
0756eb3c
PH
2358set from the command line if they were set in the process that passed the
2359connection on. */
2360
895fbaf2 2361/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 2362as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
2363It does not wait. Unclear how we keep separate host's responses
2364separate - we could match up by host ip+port as a bodge. */
2365
0756eb3c
PH
2366else
2367 {
74f1a423 2368 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
57cc2785 2369 {
74f1a423 2370 sx->cctx = cutthrough.cctx;
ee8b8090 2371 sx->conn_args.host->port = sx->port = cutthrough.host.port;
57cc2785
JH
2372 }
2373 else
2374 {
74f1a423
JH
2375 sx->cctx.sock = 0; /* stdin */
2376 sx->cctx.tls_ctx = NULL;
ee8b8090 2377 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
57cc2785 2378 }
74f1a423 2379 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
0756eb3c 2380 smtp_command = big_buffer;
5bf8a516 2381 sx->peer_offered = smtp_peer_options;
02b41d71 2382 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
875512a3 2383
57cc2785
JH
2384 /* For a continued connection with TLS being proxied for us, or a
2385 held-open verify connection with TLS, nothing more to do. */
875512a3 2386
57cc2785 2387 if ( continue_proxy_cipher
74f1a423
JH
2388 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2389 && cutthrough.is_tls)
57cc2785 2390 )
875512a3 2391 {
7c576fca 2392 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
57cc2785
JH
2393 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2394 continue_proxy_cipher ? "proxied" : "verify conn with");
875512a3
JH
2395 return OK;
2396 }
2397 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
0756eb3c
PH
2398 }
2399
2400/* If TLS is available on this connection, whether continued or not, attempt to
2401start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2402send another EHLO - the server may give a different answer in secure mode. We
2403use a separate buffer for reading the response to STARTTLS so that if it is
2404negative, the original EHLO data is available for subsequent analysis, should
2405the client not be required to use TLS. If the response is bad, copy the buffer
2406for error analysis. */
2407
01603eec 2408#ifndef DISABLE_TLS
14de8063 2409if ( smtp_peer_options & OPTION_TLS
5130845b 2410 && !suppress_tls
ee8b8090 2411 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
e9166683 2412 && ( !sx->verify
ee8b8090 2413 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
02b41d71 2414 ) )
0756eb3c
PH
2415 {
2416 uschar buffer2[4096];
ee8b8090 2417
251b9eb4 2418 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
0756eb3c
PH
2419 goto SEND_FAILED;
2420
81344b40 2421#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2422 /* If doing early-pipelining reap the banner and EHLO-response but leave
2423 the response for the STARTTLS we just sent alone. */
2424
2425 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2426 {
2427 HDEBUG(D_transport)
2428 debug_printf("failed reaping pipelined cmd responses\n");
4ca005cd
JH
2429 close(sx->cctx.sock);
2430 sx->cctx.sock = -1;
2431 sx->early_pipe_active = FALSE;
2432 goto PIPE_CONNECT_RETRY;
ee8b8090
JH
2433 }
2434#endif
2435
0756eb3c
PH
2436 /* If there is an I/O error, transmission of this message is deferred. If
2437 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2438 false, we also defer. However, if there is a temporary rejection of STARTTLS
2439 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2440 STARTTLS, we carry on. This means we will try to send the message in clear,
2441 unless the host is in hosts_require_tls (tested below). */
2442
ee8b8090 2443 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
0756eb3c 2444 {
4b0fe319
JH
2445 if ( errno != 0
2446 || buffer2[0] == 0
ee8b8090 2447 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
4b0fe319 2448 )
0dda4340 2449 {
d093f8e5 2450 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
9e7e0f6a 2451 sx->buffer[sizeof(sx->buffer)-1] = '\0';
0756eb3c 2452 goto RESPONSE_FAILED;
0dda4340 2453 }
0756eb3c
PH
2454 }
2455
2456 /* STARTTLS accepted: try to negotiate a TLS session. */
2457
2458 else
061b7ebd 2459 TLS_NEGOTIATE:
0756eb3c 2460 {
c05bdbd6 2461 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
0756eb3c 2462 {
74f1a423
JH
2463 /* TLS negotiation failed; give an error. From outside, this function may
2464 be called again to try in clear on a new connection, if the options permit
2465 it for this host. */
dca6d121
JH
2466#ifdef USE_GNUTLS
2467 GNUTLS_CONN_FAILED:
2468#endif
fc243e94 2469 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
74f1a423 2470
c0635b6d 2471# ifdef SUPPORT_DANE
c05bdbd6 2472 if (sx->conn_args.dane)
c4b57fdd
JH
2473 {
2474 log_write(0, LOG_MAIN,
cf0c6164 2475 "DANE attempt failed; TLS connection to %s [%s]: %s",
fc243e94 2476 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
8d3dc239 2477# ifndef DISABLE_EVENT
ee8b8090 2478 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd 2479 US"dane:fail", US"validation-failure"); /* could do with better detail */
8d3dc239 2480# endif
c4b57fdd 2481 }
6ebd79ec
JH
2482# endif
2483
de6273b4 2484 errno = ERRNO_TLSFAILURE;
fc243e94 2485 message = string_sprintf("TLS session: %s", tls_errstr);
d093f8e5 2486 sx->send_quit = FALSE;
0756eb3c
PH
2487 goto TLS_FAILED;
2488 }
2489
2490 /* TLS session is set up */
2491
2d14f397 2492 smtp_peer_options_wrap = smtp_peer_options;
d7978c0f 2493 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
2494 if (addr->transport_return == PENDING_DEFER)
2495 {
817d9f57 2496 addr->cipher = tls_out.cipher;
9d1c15ef
JH
2497 addr->ourcert = tls_out.ourcert;
2498 addr->peercert = tls_out.peercert;
817d9f57 2499 addr->peerdn = tls_out.peerdn;
018058b2 2500 addr->ocsp = tls_out.ocsp;
da40b1ec 2501 addr->tlsver = tls_out.ver;
5ca2a9a1 2502 }
0756eb3c
PH
2503 }
2504 }
2505
061b7ebd
PP
2506/* if smtps, we'll have smtp_command set to something else; always safe to
2507reset it here. */
2508smtp_command = big_buffer;
2509
41c7c167
PH
2510/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2511helo_data is null, we are dealing with a connection that was passed from
2512another process, and so we won't have expanded helo_data above. We have to
2513expand it here. $sending_ip_address and $sending_port are set up right at the
2514start of the Exim process (in exim.c). */
0756eb3c 2515
74f1a423 2516if (tls_out.active.sock >= 0)
0756eb3c 2517 {
ee8b8090 2518 uschar * greeting_cmd;
895fbaf2 2519
ee8b8090 2520 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
41c7c167 2521 {
d093f8e5
JH
2522 uschar *message = string_sprintf("failed to expand helo_data: %s",
2523 expand_string_message);
a55697ac 2524 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
d093f8e5
JH
2525 yield = DEFER;
2526 goto SEND_QUIT;
41c7c167
PH
2527 }
2528
81344b40 2529#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2530 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2531 We're unlikely to get the group sent and delivered before the server sends its
2532 banner, but it's still worth sending as a group.
2533 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2534 the reverse. */
2535
2536 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2537 {
2538 sx->peer_offered = sx->ehlo_resp.crypted_features;
2539 if ((sx->early_pipe_active =
2540 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2541 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2542 }
2543#endif
2544
0d0e4455 2545 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 2546 if (sx->smtps)
81344b40 2547#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2548 if (sx->early_pipe_active)
2549 {
2550 sx->pending_BANNER = TRUE;
2551 sx->outblock.cmd_count = 1;
2552 }
2553 else
895fbaf2 2554#endif
ee8b8090
JH
2555 if (!smtp_reap_banner(sx))
2556 goto RESPONSE_FAILED;
0d0e4455 2557
ee8b8090
JH
2558 if (sx->lmtp)
2559 greeting_cmd = US"LHLO";
2560 else if (sx->esmtp)
2561 greeting_cmd = US"EHLO";
0d0e4455
PP
2562 else
2563 {
ee8b8090 2564 greeting_cmd = US"HELO";
0d0e4455
PP
2565 DEBUG(D_transport)
2566 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
2567 }
2568
ee8b8090 2569 if (smtp_write_command(sx,
81344b40 2570#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2571 sx->early_pipe_active ? SCMD_BUFFER :
2572#endif
2573 SCMD_FLUSH,
2574 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
0756eb3c 2575 goto SEND_FAILED;
ee8b8090 2576
81344b40 2577#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2578 if (sx->early_pipe_active)
2579 sx->pending_EHLO = TRUE;
2580 else
895fbaf2 2581#endif
ee8b8090
JH
2582 {
2583 if (!smtp_reap_ehlo(sx))
fc243e94
JH
2584#ifdef USE_GNUTLS
2585 {
2586 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2587 cert late, under TLS1.3 - which means here; the first time we try to
2588 receive crypted data. Treat it as if it was a connect-time failure.
2589 See also the early-pipe equivalent... which will be hard; every call
2590 to sync_responses will need to check the result.
2591 It would be nicer to have GnuTLS check the cert during the handshake.
2592 Can it do that, with all the flexibility we need? */
2593
2594 tls_errstr = US"error on first read";
2595 goto GNUTLS_CONN_FAILED;
2596 }
2597#else
ee8b8090 2598 goto RESPONSE_FAILED;
fc243e94 2599#endif
ee8b8090
JH
2600 smtp_peer_options = 0;
2601 }
0756eb3c
PH
2602 }
2603
2604/* If the host is required to use a secure channel, ensure that we
2605have one. */
2606
d093f8e5 2607else if ( sx->smtps
c0635b6d 2608# ifdef SUPPORT_DANE
c05bdbd6 2609 || sx->conn_args.dane
0e66b3b6 2610# endif
ee8b8090 2611 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
7a31d643 2612 )
0756eb3c 2613 {
9883af72 2614 errno = ERRNO_TLSREQUIRED;
c562fd30 2615 message = string_sprintf("a TLS session is required, but %s",
14de8063 2616 smtp_peer_options & OPTION_TLS
2d14f397 2617 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
8d3dc239 2618# if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
c05bdbd6 2619 if (sx->conn_args.dane)
ee8b8090 2620 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
c4b57fdd
JH
2621 smtp_peer_options & OPTION_TLS
2622 ? US"validation-failure" /* could do with better detail */
2623 : US"starttls-not-supported");
2624# endif
0756eb3c
PH
2625 goto TLS_FAILED;
2626 }
01603eec 2627#endif /*DISABLE_TLS*/
0756eb3c
PH
2628
2629/* If TLS is active, we have just started it up and re-done the EHLO command,
2630so its response needs to be analyzed. If TLS is not active and this is a
2631continued session down a previously-used socket, we haven't just done EHLO, so
2632we skip this. */
2633
2634if (continue_hostname == NULL
01603eec 2635#ifndef DISABLE_TLS
74f1a423 2636 || tls_out.active.sock >= 0
a7538db1 2637#endif
0756eb3c
PH
2638 )
2639 {
d093f8e5 2640 if (sx->esmtp || sx->lmtp)
2d14f397 2641 {
81344b40 2642#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2643 if (!sx->early_pipe_active)
2644#endif
2645 {
e9166683 2646 sx->peer_offered = ehlo_response(sx->buffer,
d093f8e5 2647 0 /* no TLS */
81344b40 2648#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2649 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2650 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
9883af72 2651 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
ee8b8090
JH
2652 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2653
2654#else
2655
2656 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
14de8063
JH
2657 | OPTION_CHUNKING
2658 | OPTION_PRDR
ee8b8090 2659# ifdef SUPPORT_I18N
14de8063 2660 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
d093f8e5
JH
2661 /*XXX if we hand peercaps on to continued-conn processes,
2662 must not depend on this addr */
ee8b8090 2663# endif
14de8063
JH
2664 | OPTION_DSN
2665 | OPTION_PIPE
ee8b8090 2666 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
8ac90765 2667#endif
9094b84b 2668 );
81344b40 2669#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2670 if (tls_out.active.sock >= 0)
2671 sx->ehlo_resp.crypted_features = sx->peer_offered;
2672#endif
2673 }
9094b84b 2674
2d14f397
JH
2675 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2676 lmtp_ignore_quota option was set. */
f1513293 2677
14de8063 2678 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2679
2d14f397
JH
2680 /* If the response to EHLO specified support for the SIZE parameter, note
2681 this, provided size_addition is non-negative. */
f1513293 2682
14de8063 2683 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
0756eb3c 2684
2d14f397
JH
2685 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2686 the current host, esmtp will be false, so PIPELINING can never be used. If
2687 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2688
14de8063 2689 if ( sx->peer_offered & OPTION_PIPE
ee8b8090 2690 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
14de8063 2691 smtp_peer_options |= OPTION_PIPE;
0756eb3c 2692
2d14f397 2693 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
14de8063 2694 smtp_peer_options & OPTION_PIPE ? "" : "not ");
0756eb3c 2695
14de8063 2696 if ( sx->peer_offered & OPTION_CHUNKING
ee8b8090 2697 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
14de8063 2698 sx->peer_offered &= ~OPTION_CHUNKING;
f98442df 2699
14de8063 2700 if (sx->peer_offered & OPTION_CHUNKING)
ee8b8090 2701 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
0756eb3c 2702
8ccd00b1 2703#ifndef DISABLE_PRDR
14de8063 2704 if ( sx->peer_offered & OPTION_PRDR
ee8b8090 2705 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
14de8063 2706 sx->peer_offered &= ~OPTION_PRDR;
fd98a5c6 2707
14de8063 2708 if (sx->peer_offered & OPTION_PRDR)
ee8b8090 2709 DEBUG(D_transport) debug_printf("PRDR usable\n");
fd98a5c6
JH
2710#endif
2711
2d14f397 2712 /* Note if the server supports DSN */
14de8063 2713 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2d14f397 2714 DEBUG(D_transport) debug_printf("%susing DSN\n",
14de8063 2715 sx->peer_offered & OPTION_DSN ? "" : "not ");
6c1c3d1d 2716
81344b40 2717#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2718 if ( sx->early_pipe_ok
2719 && !sx->early_pipe_active
2720 && tls_out.active.sock >= 0
2721 && smtp_peer_options & OPTION_PIPE
2722 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2723 & OPTION_EARLY_PIPE)
2724 {
2725 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2726 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2727 write_ehlo_cache_entry(sx);
2728 }
2729#endif
2730
2d14f397
JH
2731 /* Note if the response to EHLO specifies support for the AUTH extension.
2732 If it has, check that this host is one we want to authenticate to, and do
2733 the business. The host name and address must be available when the
2734 authenticator's client driver is running. */
0756eb3c 2735
ee8b8090 2736 switch (yield = smtp_auth(sx))
2d14f397
JH
2737 {
2738 default: goto SEND_QUIT;
2739 case OK: break;
2740 case FAIL_SEND: goto SEND_FAILED;
2741 case FAIL: goto RESPONSE_FAILED;
2742 }
0756eb3c
PH
2743 }
2744 }
7c576fca 2745sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
0756eb3c
PH
2746
2747/* The setting up of the SMTP call is now complete. Any subsequent errors are
2748message-specific. */
2749
d093f8e5 2750sx->setting_up = FALSE;
0756eb3c 2751
8c5d388a 2752#ifdef SUPPORT_I18N
d093f8e5 2753if (sx->addrlist->prop.utf8_msg)
9094b84b 2754 {
71c15846
JH
2755 uschar * s;
2756
2757 /* If the transport sets a downconversion mode it overrides any set by ACL
2758 for the message. */
2759
ee8b8090 2760 if ((s = ob->utf8_downconvert))
71c15846
JH
2761 {
2762 if (!(s = expand_string(s)))
2763 {
2764 message = string_sprintf("failed to expand utf8_downconvert: %s",
2765 expand_string_message);
a55697ac 2766 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
71c15846
JH
2767 yield = DEFER;
2768 goto SEND_QUIT;
2769 }
2770 switch (*s)
2771 {
2772 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2773 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 break;
2775 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2776 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2777 break;
2778 case '-': if (s[1] == '1')
2779 {
2780 sx->addrlist->prop.utf8_downcvt = FALSE;
2781 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2782 }
2783 break;
2784 }
2785 }
2786
d093f8e5
JH
2787 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2788 && !sx->addrlist->prop.utf8_downcvt_maybe;
2789 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2790 debug_printf("utf8: %s downconvert\n",
d093f8e5 2791 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2792 }
2793
7ade712c 2794/* If this is an international message we need the host to speak SMTPUTF8 */
14de8063 2795if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
7ade712c
JH
2796 {
2797 errno = ERRNO_UTF8_FWD;
2798 goto RESPONSE_FAILED;
2799 }
71c15846 2800#endif /*SUPPORT_I18N*/
7ade712c 2801
d093f8e5
JH
2802return OK;
2803
2804
2805 {
2806 int code;
d093f8e5
JH
2807
2808 RESPONSE_FAILED:
eebcfa1c
JH
2809 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2810 {
2811 /* There is a testing facility for simulating a connection timeout, as I
2812 can't think of any other way of doing this. It converts a connection
2813 refused into a timeout if the timeout is set to 999999. This is done for
2814 a 3whs connection in ip_connect(), but a TFO connection does not error
2815 there - instead it gets ECONNREFUSED on the first data read. Tracking
2816 that a TFO really was done is too hard, or we would set a
2817 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2818 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2819 cmd-timeout. */
2820
2821 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2822 errno = ETIMEDOUT;
2823 set_errno_nohost(sx->addrlist,
2824 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2825 sx->verify ? US strerror(errno) : NULL,
a55697ac 2826 DEFER, FALSE, &sx->delivery_start);
eebcfa1c
JH
2827 sx->send_quit = FALSE;
2828 return DEFER;
2829 }
2830
2831 /* really an error on an SMTP read */
d093f8e5 2832 message = NULL;
ee8b8090 2833 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
d093f8e5 2834 sx->buffer, &code, &message, &pass_message);
8ac90765 2835 yield = DEFER;
d093f8e5 2836 goto FAILED;
d093f8e5
JH
2837
2838 SEND_FAILED:
d093f8e5
JH
2839 code = '4';
2840 message = US string_sprintf("send() to %s [%s] failed: %s",
ee8b8090 2841 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
d093f8e5 2842 sx->send_quit = FALSE;
8ac90765 2843 yield = DEFER;
d093f8e5 2844 goto FAILED;
d093f8e5 2845
de6273b4
JH
2846 EHLOHELO_FAILED:
2847 code = '4';
2848 message = string_sprintf("Remote host closed connection in response to %s"
2849 " (EHLO response was: %s)", smtp_command, sx->buffer);
2850 sx->send_quit = FALSE;
8ac90765 2851 yield = DEFER;
de6273b4
JH
2852 goto FAILED;
2853
e5ab0ba9
JH
2854 /* This label is jumped to directly when a TLS negotiation has failed,
2855 or was not done for a host for which it is required. Values will be set
2856 in message and errno, and setting_up will always be true. Treat as
2857 a temporary error. */
2858
01603eec 2859#ifndef DISABLE_TLS
d093f8e5 2860 TLS_FAILED:
9883af72 2861 code = '4', yield = DEFER;
de6273b4 2862 goto FAILED;
d093f8e5
JH
2863#endif
2864
2865 /* The failure happened while setting up the call; see if the failure was
2866 a 5xx response (this will either be on connection, or following HELO - a 5xx
e69636bc
JH
2867 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2868 fail all addresses, as this host is never going to accept them. For other
2869 errors during setting up (timeouts or whatever), defer all addresses, and
2870 yield DEFER, so that the host is not tried again for a while.
2871
2872 XXX This peeking for another host feels like a layering violation. We want
2873 to note the host as unusable, but down here we shouldn't know if this was
2874 the last host to try for the addr(list). Perhaps the upper layer should be
2875 the one to do set_errno() ? The problem is that currently the addr is where
2876 errno etc. are stashed, but until we run out of hosts to try the errors are
2877 host-specific. Maybe we should enhance the host_item definition? */
d093f8e5 2878
de6273b4 2879FAILED:
d093f8e5 2880 sx->ok = FALSE; /* For when reached by GOTO */
e69636bc 2881 set_errno(sx->addrlist, errno, message,
ee8b8090 2882 sx->conn_args.host->next
e69636bc
JH
2883 ? DEFER
2884 : code == '5'
d093f8e5 2885#ifdef SUPPORT_I18N
e69636bc 2886 || errno == ERRNO_UTF8_FWD
d093f8e5 2887#endif
e69636bc 2888 ? FAIL : DEFER,
2d56d634 2889 pass_message,
a55697ac 2890 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
d093f8e5 2891#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 2892 sx->smtp_greeting, sx->helo_response,
d093f8e5 2893#endif
a55697ac 2894 &sx->delivery_start);
d093f8e5
JH
2895 }
2896
2897
2898SEND_QUIT:
2899
2900if (sx->send_quit)
251b9eb4 2901 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
d093f8e5 2902
01603eec 2903#ifndef DISABLE_TLS
74f1a423
JH
2904if (sx->cctx.tls_ctx)
2905 {
2906 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2907 sx->cctx.tls_ctx = NULL;
2908 }
d093f8e5
JH
2909#endif
2910
2911/* Close the socket, and return the appropriate value, first setting
2912works because the NULL setting is passed back to the calling process, and
2913remote_max_parallel is forced to 1 when delivering over an existing connection,
b7d3afcf 2914*/
d093f8e5 2915
e1d04f48 2916HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
d093f8e5
JH
2917if (sx->send_quit)
2918 {
74f1a423
JH
2919 shutdown(sx->cctx.sock, SHUT_WR);
2920 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
d7978c0f
JH
2921 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2922 i--; /* drain socket */
02b41d71 2923 sx->send_quit = FALSE;
d093f8e5 2924 }
74f1a423
JH
2925(void)close(sx->cctx.sock);
2926sx->cctx.sock = -1;
d093f8e5
JH
2927
2928#ifndef DISABLE_EVENT
ee8b8090 2929(void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
d093f8e5
JH
2930#endif
2931
2932continue_transport = NULL;
2933continue_hostname = NULL;
2934return yield;
2935}
2936
2937
9be4572b
JH
2938
2939
2940/* Create the string of options that will be appended to the MAIL FROM:
2941in the connection context buffer */
2942
2943static int
2944build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2945{
2946uschar * p = sx->buffer;
2947address_item * addr;
2948int address_count;
2949
2950*p = 0;
2951
14de8063 2952/* If we know the receiving MTA supports the SIZE qualification, and we know it,
9be4572b
JH
2953send it, adding something to the message size to allow for imprecision
2954and things that get added en route. Exim keeps the number of lines
2955in a message, so we can give an accurate value for the original message, but we
2956need some additional to handle added headers. (Double "." characters don't get
2957included in the count.) */
2958
14de8063
JH
2959if ( message_size > 0
2960 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
9be4572b 2961 {
328c5688
JH
2962/*XXX problem here under spool_files_wireformat?
2963Or just forget about lines? Or inflate by a fixed proportion? */
2964
ee8b8090 2965 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
9be4572b
JH
2966 while (*p) p++;
2967 }
2968
2969#ifndef DISABLE_PRDR
aded2255 2970/* If it supports Per-Recipient Data Responses, and we have more than one recipient,
9be4572b
JH
2971request that */
2972
2973sx->prdr_active = FALSE;
14de8063 2974if (sx->peer_offered & OPTION_PRDR)
d7978c0f 2975 for (address_item * addr = addrlist; addr; addr = addr->next)
9be4572b
JH
2976 if (addr->transport_return == PENDING_DEFER)
2977 {
2978 for (addr = addr->next; addr; addr = addr->next)
2979 if (addr->transport_return == PENDING_DEFER)
2980 { /* at least two recipients to send */
2981 sx->prdr_active = TRUE;
2982 sprintf(CS p, " PRDR"); p += 5;
2983 break;
2984 }
2985 break;
2986 }
2987#endif
2988
2989#ifdef SUPPORT_I18N
2990/* If it supports internationalised messages, and this meesage need that,
2991request it */
2992
14de8063 2993if ( sx->peer_offered & OPTION_UTF8
9be4572b
JH
2994 && addrlist->prop.utf8_msg
2995 && !addrlist->prop.utf8_downcvt
2996 )
f3ebb786 2997 Ustrcpy(p, US" SMTPUTF8"), p += 9;
9be4572b
JH
2998#endif
2999
3000/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3001for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3002 addr && address_count < sx->max_rcpt;
3003 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3004 {
3005 address_count++;
3006 if (!(addr->dsn_flags & rf_dsnlasthop))
3007 {
3008 sx->dsn_all_lasthop = FALSE;
3009 break;
3010 }
3011 }
3012
3013/* Add any DSN flags to the mail command */
3014
14de8063 3015if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
9be4572b
JH
3016 {
3017 if (dsn_ret == dsn_ret_hdrs)
f3ebb786 3018 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
9be4572b 3019 else if (dsn_ret == dsn_ret_full)
f3ebb786 3020 { Ustrcpy(p, US" RET=FULL"); p += 9; }
9be4572b
JH
3021
3022 if (dsn_envid)
3023 {
3024 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 while (*p) p++;
3026 }
3027 }
3028
3029/* If an authenticated_sender override has been specified for this transport
3030instance, expand it. If the expansion is forced to fail, and there was already
3031an authenticated_sender for this message, the original value will be used.
3032Other expansion failures are serious. An empty result is ignored, but there is
3033otherwise no check - this feature is expected to be used with LMTP and other
3034cases where non-standard addresses (e.g. without domains) might be required. */
3035
a55697ac 3036return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
9be4572b
JH
3037}
3038
3039
3040static void
3041build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3042{
3043uschar * p = sx->buffer;
3044*p = 0;
3045
3046/* Add any DSN flags to the rcpt command */
3047
14de8063 3048if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
9be4572b
JH
3049 {
3050 if (addr->dsn_flags & rf_dsnflags)
3051 {
9be4572b
JH
3052 BOOL first = TRUE;
3053
f3ebb786 3054 Ustrcpy(p, US" NOTIFY=");
9be4572b 3055 while (*p) p++;
d7978c0f 3056 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
9be4572b
JH
3057 {
3058 if (!first) *p++ = ',';
3059 first = FALSE;
3060 Ustrcpy(p, rf_names[i]);
3061 while (*p) p++;
3062 }
3063 }
3064
3065 if (addr->dsn_orcpt)
3066 {
3067 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3068 addr->dsn_orcpt);
3069 while (*p) p++;
3070 }
3071 }
3072}
3073
3074
d9c3c8ed
JH
3075
3076/*
3077Return:
e9166683
JH
3078 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3079 -1 MAIL response error
3080 -2 any non-MAIL read i/o error
3081 -3 non-MAIL response timeout
3082 -4 internal error; channel still usable
3083 -5 transmit failed
d9c3c8ed
JH
3084 */
3085
3086int
3087smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3088{
3089address_item * addr;
c4639661 3090int address_count, pipe_limit;
d9c3c8ed
JH
3091int rc;
3092
3093if (build_mailcmd_options(sx, sx->first_addr) != OK)
3094 {
3095 *yield = ERROR;
e9166683 3096 return -4;
d9c3c8ed
JH
3097 }
3098
3099/* From here until we send the DATA command, we can make use of PIPELINING
3100if the server host supports it. The code has to be able to check the responses
3101at any point, for when the buffer fills up, so we write it totally generally.
3102When PIPELINING is off, each command written reports that it has flushed the
3103buffer. */
3104
3105sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3106
3107 {
3108 uschar * s = sx->from_addr;
3109#ifdef SUPPORT_I18N
3110 uschar * errstr = NULL;
3111
3112 /* If we must downconvert, do the from-address here. Remember we had to
3113 for the to-addresses (done below), and also (ugly) for re-doing when building
3114 the delivery log line. */
3115
3116 if ( sx->addrlist->prop.utf8_msg
14de8063 3117 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
d9c3c8ed
JH
3118 )
3119 {
3120 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3121 {
a55697ac 3122 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
d9c3c8ed 3123 *yield = ERROR;
e9166683 3124 return -4;
d9c3c8ed
JH
3125 }
3126 setflag(sx->addrlist, af_utf8_downcvt);
3127 }
3128#endif
3129
251b9eb4 3130 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
d9c3c8ed
JH
3131 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3132 }
3133
3134mail_command = string_copy(big_buffer); /* Save for later error message */
3135
3136switch(rc)
3137 {
3138 case -1: /* Transmission error */
e9166683 3139 return -5;
d9c3c8ed 3140
df5b41e3 3141 case +1: /* Cmd was sent */
251b9eb4 3142 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
ee8b8090 3143 (SOB sx->conn_args.ob)->command_timeout))
d9c3c8ed
JH
3144 {
3145 if (errno == 0 && sx->buffer[0] == '4')
3146 {
3147 errno = ERRNO_MAIL4XX;
3148 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3149 }
3150 return -1;
3151 }
3152 sx->pending_MAIL = FALSE;
3153 break;
e9166683
JH
3154
3155 /* otherwise zero: command queued for pipeline */
d9c3c8ed
JH
3156 }
3157
3158/* Pass over all the relevant recipient addresses for this host, which are the
3159ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3160several before we have to read the responses for those seen so far. This
3161checking is done by a subroutine because it also needs to be done at the end.
3162Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3163the next one if not all are sent.
3164
3165In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3166last address because we want to abort if any recipients have any kind of
3167problem, temporary or permanent. We know that all recipient addresses will have
3168the PENDING_DEFER status, because only one attempt is ever made, and we know
e9166683
JH
3169that max_rcpt will be large, so all addresses will be done at once.
3170
3171For verify we flush the pipeline after any (the only) rcpt address. */
d9c3c8ed 3172
c4639661 3173for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
d9c3c8ed
JH
3174 addr && address_count < sx->max_rcpt;
3175 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3176 {
c4639661 3177 int cmds_sent;
d9c3c8ed
JH
3178 BOOL no_flush;
3179 uschar * rcpt_addr;
3180
14de8063 3181 addr->dsn_aware = sx->peer_offered & OPTION_DSN
d9c3c8ed
JH
3182 ? dsn_support_yes : dsn_support_no;
3183
3184 address_count++;
c4639661
JH
3185 if (pipe_limit-- <= 0)
3186 { no_flush = FALSE; pipe_limit = 100; }
3187 else
3188 no_flush = pipelining_active && !sx->verify
4c2471ca 3189 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
d9c3c8ed
JH
3190
3191 build_rcptcmd_options(sx, addr);
3192
3193 /* Now send the RCPT command, and process outstanding responses when
3194 necessary. After a timeout on RCPT, we just end the function, leaving the
3195 yield as OK, because this error can often mean that there is a problem with
3196 just one address, so we don't want to delay the host. */
3197
ee8b8090 3198 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
d9c3c8ed
JH
3199
3200#ifdef SUPPORT_I18N
3201 if ( testflag(sx->addrlist, af_utf8_downcvt)
3202 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3203 )
3204 {
3205 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3206 errno = ERRNO_EXPANDFAIL;
e9166683 3207 return -5; /*XXX too harsh? */
d9c3c8ed
JH
3208 }
3209#endif
3210
c4639661 3211 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,