Add compile-time checks for various tables being in alphabetical order.
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH
1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
c4ceed07 5/* Copyright (c) University of Cambridge 1995 - 2012 */
0756eb3c
PH
6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
48c7f9e2
PH
22 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
0756eb3c
PH
24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
382afc6b
PH
28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
0756eb3c
PH
30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 40#ifndef DISABLE_DKIM
f7572e5a
TK
41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 53#endif
0756eb3c
PH
54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
9e4f5962
PP
58 { "dscp", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dscp) },
0756eb3c
PH
60 { "fallback_hosts", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
62 { "final_timeout", opt_time,
63 (void *)offsetof(smtp_transport_options_block, final_timeout) },
64 { "gethostbyname", opt_bool,
65 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 66#ifdef SUPPORT_TLS
b1770b6e 67 /* These are no longer honoured, as of Exim 4.80; for now, we silently
17c76198
PP
68 ignore; a later release will warn, and a later-still release will remove
69 these options, so that using them becomes an error. */
83da1223
PH
70 { "gnutls_require_kx", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
72 { "gnutls_require_mac", opt_stringptr,
73 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
74 { "gnutls_require_protocols", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 76#endif
0756eb3c
PH
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 85#ifdef SUPPORT_TLS
0756eb3c
PH
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 88#endif
0756eb3c
PH
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 93#ifdef SUPPORT_TLS
0756eb3c
PH
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 96#endif
0756eb3c
PH
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 103#ifdef SUPPORT_TLS
f5d78688
JH
104# if defined EXPERIMENTAL_OCSP
105 { "hosts_require_ocsp", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
107# endif
0756eb3c
PH
108 { "hosts_require_tls", opt_stringptr,
109 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 110#endif
0756eb3c
PH
111 { "hosts_try_auth", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
fd98a5c6
JH
113#ifdef EXPERIMENTAL_PRDR
114 { "hosts_try_prdr", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
116#endif
99400968
JH
117#ifdef SUPPORT_TLS
118 { "hosts_verify_avoid_tls", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
120#endif
0756eb3c
PH
121 { "interface", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, interface) },
123 { "keepalive", opt_bool,
124 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH
125 { "lmtp_ignore_quota", opt_bool,
126 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH
127 { "max_rcpt", opt_int | opt_public,
128 (void *)offsetof(transport_instance, max_addresses) },
129 { "multi_domain", opt_bool | opt_public,
130 (void *)offsetof(transport_instance, multi_domain) },
131 { "port", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, port) },
133 { "protocol", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, protocol) },
135 { "retry_include_ip_address", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
137 { "serialize_hosts", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
139 { "size_addition", opt_int,
140 (void *)offsetof(smtp_transport_options_block, size_addition) }
80a47a2c 141#ifdef SUPPORT_TLS
0756eb3c
PH
142 ,{ "tls_certificate", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
144 { "tls_crl", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP
146 { "tls_dh_min_bits", opt_int,
147 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH
148 { "tls_privatekey", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 150 { "tls_require_ciphers", opt_stringptr,
0756eb3c 151 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP
152 { "tls_sni", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH
154 { "tls_tempfail_tryclear", opt_bool,
155 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
156 { "tls_verify_certificates", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
80a47a2c 158#endif
0756eb3c
PH
159};
160
161/* Size of the options list. An extern variable has to be used so that its
162address can appear in the tables drtables.c. */
163
164int smtp_transport_options_count =
165 sizeof(smtp_transport_options)/sizeof(optionlist);
166
167/* Default private options block for the smtp transport. */
168
169smtp_transport_options_block smtp_transport_option_defaults = {
170 NULL, /* hosts */
171 NULL, /* fallback_hosts */
172 NULL, /* hostlist */
173 NULL, /* fallback_hostlist */
174 NULL, /* authenticated_sender */
175 US"$primary_hostname", /* helo_data */
176 NULL, /* interface */
177 NULL, /* port */
178 US"smtp", /* protocol */
9e4f5962 179 NULL, /* DSCP */
0756eb3c
PH
180 NULL, /* serialize_hosts */
181 NULL, /* hosts_try_auth */
182 NULL, /* hosts_require_auth */
fd98a5c6
JH
183#ifdef EXPERIMENTAL_PRDR
184 NULL, /* hosts_try_prdr */
185#endif
f5d78688
JH
186#ifdef EXPERIMENTAL_OCSP
187 NULL, /* hosts_require_ocsp */
188#endif
0756eb3c
PH
189 NULL, /* hosts_require_tls */
190 NULL, /* hosts_avoid_tls */
99400968 191 US"*", /* hosts_verify_avoid_tls */
c51b8e75 192 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH
193 NULL, /* hosts_avoid_esmtp */
194 NULL, /* hosts_nopass_tls */
195 5*60, /* command_timeout */
196 5*60, /* connect_timeout; shorter system default overrides */
197 5*60, /* data timeout */
198 10*60, /* final timeout */
199 1024, /* size_addition */
200 5, /* hosts_max_try */
8e669ac1 201 50, /* hosts_max_try_hardlimit */
48c7f9e2 202 TRUE, /* address_retry_include_sender */
0756eb3c 203 FALSE, /* allow_localhost */
382afc6b 204 FALSE, /* authenticated_sender_force */
0756eb3c
PH
205 FALSE, /* gethostbyname */
206 TRUE, /* dns_qualify_single */
207 FALSE, /* dns_search_parents */
208 TRUE, /* delay_after_cutoff */
209 FALSE, /* hosts_override */
210 FALSE, /* hosts_randomize */
211 TRUE, /* keepalive */
f1513293 212 FALSE, /* lmtp_ignore_quota */
0756eb3c 213 TRUE /* retry_include_ip_address */
80a47a2c 214#ifdef SUPPORT_TLS
0756eb3c
PH
215 ,NULL, /* tls_certificate */
216 NULL, /* tls_crl */
217 NULL, /* tls_privatekey */
218 NULL, /* tls_require_ciphers */
83da1223
PH
219 NULL, /* gnutls_require_kx */
220 NULL, /* gnutls_require_mac */
221 NULL, /* gnutls_require_proto */
54c90be1 222 NULL, /* tls_sni */
0756eb3c 223 NULL, /* tls_verify_certificates */
54c90be1
PP
224 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
225 /* tls_dh_min_bits */
226 TRUE /* tls_tempfail_tryclear */
80a47a2c
TK
227#endif
228#ifndef DISABLE_DKIM
f7572e5a
TK
229 ,NULL, /* dkim_canon */
230 NULL, /* dkim_domain */
231 NULL, /* dkim_private_key */
232 NULL, /* dkim_selector */
233 NULL, /* dkim_sign_headers */
234 NULL /* dkim_strict */
80a47a2c 235#endif
0756eb3c
PH
236};
237
238
239/* Local statics */
240
241static uschar *smtp_command; /* Points to last cmd for error messages */
242static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 243static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH
244
245
246/*************************************************
247* Setup entry point *
248*************************************************/
249
250/* This function is called when the transport is about to be used,
251but before running it in a sub-process. It is used for two things:
252
253 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH
254 (2) To pass back the interface, port, protocol, and other options, for use
255 during callout verification.
0756eb3c
PH
256
257Arguments:
258 tblock pointer to the transport instance block
259 addrlist list of addresses about to be transported
260 tf if not NULL, pointer to block in which to return options
929ba01c
PH
261 uid the uid that will be set (not used)
262 gid the gid that will be set (not used)
0756eb3c
PH
263 errmsg place for error message (not used)
264
265Returns: OK always (FAIL, DEFER not used)
266*/
267
268static int
269smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 270 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH
271{
272smtp_transport_options_block *ob =
273 (smtp_transport_options_block *)(tblock->options_block);
274
275errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH
276uid = uid;
277gid = gid;
0756eb3c
PH
278
279/* Pass back options if required. This interface is getting very messy. */
280
281if (tf != NULL)
282 {
283 tf->interface = ob->interface;
284 tf->port = ob->port;
285 tf->protocol = ob->protocol;
286 tf->hosts = ob->hosts;
287 tf->hosts_override = ob->hosts_override;
288 tf->hosts_randomize = ob->hosts_randomize;
289 tf->gethostbyname = ob->gethostbyname;
290 tf->qualify_single = ob->dns_qualify_single;
291 tf->search_parents = ob->dns_search_parents;
26da7e20 292 tf->helo_data = ob->helo_data;
0756eb3c
PH
293 }
294
295/* Set the fallback host list for all the addresses that don't have fallback
296host lists, provided that the local host wasn't present in the original host
297list. */
298
299if (!testflag(addrlist, af_local_host_removed))
300 {
301 for (; addrlist != NULL; addrlist = addrlist->next)
302 if (addrlist->fallback_hosts == NULL)
303 addrlist->fallback_hosts = ob->fallback_hostlist;
304 }
305
306return OK;
307}
308
309
310
311/*************************************************
312* Initialization entry point *
313*************************************************/
314
315/* Called for each instance, after its options have been read, to
316enable consistency checks to be done, or anything else that needs
317to be set up.
318
319Argument: pointer to the transport instance block
320Returns: nothing
321*/
322
323void
324smtp_transport_init(transport_instance *tblock)
325{
326smtp_transport_options_block *ob =
327 (smtp_transport_options_block *)(tblock->options_block);
328
329/* Retry_use_local_part defaults FALSE if unset */
330
331if (tblock->retry_use_local_part == TRUE_UNSET)
332 tblock->retry_use_local_part = FALSE;
333
334/* Set the default port according to the protocol */
335
336if (ob->port == NULL)
061b7ebd
PP
337 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
338 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH
339
340/* Set up the setup entry point, to be called before subprocesses for this
341transport. */
342
343tblock->setup = smtp_transport_setup;
344
345/* Complain if any of the timeouts are zero. */
346
347if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
348 ob->final_timeout <= 0)
349 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
350 "command, data, or final timeout value is zero for %s transport",
351 tblock->name);
352
353/* If hosts_override is set and there are local hosts, set the global
354flag that stops verify from showing router hosts. */
355
356if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
357
358/* If there are any fallback hosts listed, build a chain of host items
359for them, but do not do any lookups at this time. */
360
361host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
362}
363
364
365
366
367
368/*************************************************
369* Set delivery info into all active addresses *
370*************************************************/
371
372/* Only addresses whose status is >= PENDING are relevant. A lesser
373status means that an address is not currently being processed.
374
375Arguments:
447d236c
PH
376 addrlist points to a chain of addresses
377 errno_value to put in each address's errno field
378 msg to put in each address's message field
379 rc to put in each address's transport_return field
380 pass_message if TRUE, set the "pass message" flag in the address
0756eb3c
PH
381
382If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
383the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
384this particular type of timeout.
385
386Returns: nothing
387*/
388
7cd1141b
PH
389static void
390set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
447d236c 391 BOOL pass_message)
0756eb3c
PH
392{
393address_item *addr;
394int orvalue = 0;
395if (errno_value == ERRNO_CONNECTTIMEOUT)
396 {
397 errno_value = ETIMEDOUT;
398 orvalue = RTEF_CTOUT;
399 }
400for (addr = addrlist; addr != NULL; addr = addr->next)
401 {
402 if (addr->transport_return < PENDING) continue;
403 addr->basic_errno = errno_value;
404 addr->more_errno |= orvalue;
447d236c
PH
405 if (msg != NULL)
406 {
407 addr->message = msg;
408 if (pass_message) setflag(addr, af_pass_message);
409 }
0756eb3c
PH
410 addr->transport_return = rc;
411 }
412}
413
414
415
416/*************************************************
417* Check an SMTP response *
418*************************************************/
419
420/* This function is given an errno code and the SMTP response buffer
421to analyse, together with the host identification for generating messages. It
422sets an appropriate message and puts the first digit of the response code into
423the yield variable. If no response was actually read, a suitable digit is
424chosen.
425
426Arguments:
447d236c
PH
427 host the current host, to get its name for messages
428 errno_value pointer to the errno value
429 more_errno from the top address for use with ERRNO_FILTER_FAIL
430 buffer the SMTP response buffer
431 yield where to put a one-digit SMTP response code
432 message where to put an errror message
433 pass_message set TRUE if message is an SMTP response
434
435Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
436*/
437
438static BOOL check_response(host_item *host, int *errno_value, int more_errno,
447d236c 439 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH
440{
441uschar *pl = US"";
442
443if (smtp_use_pipelining &&
444 (Ustrcmp(smtp_command, "MAIL") == 0 ||
445 Ustrcmp(smtp_command, "RCPT") == 0 ||
446 Ustrcmp(smtp_command, "DATA") == 0))
447 pl = US"pipelined ";
448
449*yield = '4'; /* Default setting is to give a temporary error */
450
451/* Handle response timeout */
452
453if (*errno_value == ETIMEDOUT)
454 {
455 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
456 "after %s%s", host->name, host->address, pl, smtp_command);
457 if (transport_count > 0)
458 *message = US string_sprintf("%s (%d bytes written)", *message,
459 transport_count);
460 return FALSE;
461 }
462
463/* Handle malformed SMTP response */
464
465if (*errno_value == ERRNO_SMTPFORMAT)
466 {
467 uschar *malfresp = string_printing(buffer);
468 while (isspace(*malfresp)) malfresp++;
469 if (*malfresp == 0)
470 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
471 "%s [%s] in response to %s%s", host->name, host->address, pl,
472 smtp_command);
473 else
474 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
475 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
476 return FALSE;
477 }
478
479/* Handle a failed filter process error; can't send QUIT as we mustn't
480end the DATA. */
481
482if (*errno_value == ERRNO_FILTER_FAIL)
483 {
35af9f61 484 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 485 more_errno,
35af9f61 486 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
487 return FALSE;
488 }
489
490/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
491end the DATA. */
492
493if (*errno_value == ERRNO_CHHEADER_FAIL)
494 {
495 *message =
496 US string_sprintf("failed to expand headers_add or headers_remove: %s",
497 expand_string_message);
498 return FALSE;
499 }
500
501/* Handle failure to write a complete data block */
502
503if (*errno_value == ERRNO_WRITEINCOMPLETE)
504 {
505 *message = US string_sprintf("failed to write a data block");
506 return FALSE;
507 }
508
509/* Handle error responses from the remote mailer. */
510
511if (buffer[0] != 0)
512 {
513 uschar *s = string_printing(buffer);
447d236c 514 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
0756eb3c 515 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
447d236c 516 *pass_message = TRUE;
0756eb3c
PH
517 *yield = buffer[0];
518 return TRUE;
519 }
520
521/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
522connection closed) case, which causes deferral. An explicit connection reset
523error has the same effect. Otherwise, put the host's identity in the message,
524leaving the errno value to be interpreted as well. In all cases, we have to
525assume the connection is now dead. */
0756eb3c 526
19b9dc85 527if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
528 {
529 *errno_value = ERRNO_SMTPCLOSED;
530 *message = US string_sprintf("Remote host %s [%s] closed connection "
531 "in response to %s%s", host->name, host->address, pl, smtp_command);
532 }
533else *message = US string_sprintf("%s [%s]", host->name, host->address);
534
535return FALSE;
536}
537
538
539
540/*************************************************
541* Write error message to logs *
542*************************************************/
543
544/* This writes to the main log and to the message log.
545
546Arguments:
547 addr the address item containing error information
548 host the current host
549
550Returns: nothing
551*/
552
553static void
554write_logs(address_item *addr, host_item *host)
555{
556if (addr->message != NULL)
557 {
558 uschar *message = addr->message;
559 if (addr->basic_errno > 0)
560 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
561 log_write(0, LOG_MAIN, "%s", message);
562 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
563 }
564else
565 {
7cd1141b
PH
566 uschar *msg =
567 ((log_extra_selector & LX_outgoing_port) != 0)?
568 string_sprintf("%s [%s]:%d", host->name, host->address,
569 (host->port == PORT_NONE)? 25 : host->port)
570 :
571 string_sprintf("%s [%s]", host->name, host->address);
572 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
573 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
0756eb3c
PH
574 strerror(addr->basic_errno));
575 }
576}
577
578
579
580/*************************************************
581* Synchronize SMTP responses *
582*************************************************/
583
584/* This function is called from smtp_deliver() to receive SMTP responses from
585the server, and match them up with the commands to which they relate. When
586PIPELINING is not in use, this function is called after every command, and is
587therefore somewhat over-engineered, but it is simpler to use a single scheme
588that works both with and without PIPELINING instead of having two separate sets
589of code.
590
591The set of commands that are buffered up with pipelining may start with MAIL
592and may end with DATA; in between are RCPT commands that correspond to the
593addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
594etc.) are never buffered.
595
596Errors after MAIL or DATA abort the whole process leaving the response in the
597buffer. After MAIL, pending responses are flushed, and the original command is
598re-instated in big_buffer for error messages. For RCPT commands, the remote is
599permitted to reject some recipient addresses while accepting others. However
600certain errors clearly abort the whole process. Set the value in
601transport_return to PENDING_OK if the address is accepted. If there is a
602subsequent general error, it will get reset accordingly. If not, it will get
603converted to OK at the end.
604
605Arguments:
48c7f9e2
PH
606 addrlist the complete address list
607 include_affixes TRUE if affixes include in RCPT
608 sync_addr ptr to the ptr of the one to start scanning at (updated)
609 host the host we are connected to
610 count the number of responses to read
611 address_retry_
612 include_sender true if 4xx retry is to include the sender it its key
613 pending_MAIL true if the first response is for MAIL
614 pending_DATA 0 if last command sent was not DATA
615 +1 if previously had a good recipient
616 -1 if not previously had a good recipient
617 inblock incoming SMTP block
618 timeout timeout value
619 buffer buffer for reading response
620 buffsize size of buffer
0756eb3c
PH
621
622Returns: 3 if at least one address had 2xx and one had 5xx
623 2 if at least one address had 5xx but none had 2xx
624 1 if at least one host had a 2xx response, but none had 5xx
625 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
626 -1 timeout while reading RCPT response
627 -2 I/O or other non-response error for RCPT
628 -3 DATA or MAIL failed - errno and buffer set
629*/
630
631static int
632sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
633 address_item **sync_addr, host_item *host, int count,
634 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
635 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
636 int buffsize)
637{
638address_item *addr = *sync_addr;
639int yield = 0;
640
641/* Handle the response for a MAIL command. On error, reinstate the original
642command in big_buffer for error message use, and flush any further pending
643responses before returning, except after I/O errors and timeouts. */
644
645if (pending_MAIL)
646 {
647 count--;
648 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
649 {
650 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
651 if (errno == 0 && buffer[0] != 0)
652 {
653 uschar flushbuffer[4096];
e97957bc
PH
654 int save_errno = 0;
655 if (buffer[0] == '4')
656 {
657 save_errno = ERRNO_MAIL4XX;
658 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
659 }
0756eb3c
PH
660 while (count-- > 0)
661 {
662 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
663 '2', timeout)
664 && (errno != 0 || flushbuffer[0] == 0))
665 break;
666 }
e97957bc 667 errno = save_errno;
0756eb3c
PH
668 }
669 return -3;
670 }
671 }
672
673if (pending_DATA) count--; /* Number of RCPT responses to come */
674
675/* Read and handle the required number of RCPT responses, matching each one up
676with an address by scanning for the next address whose status is PENDING_DEFER.
677*/
678
679while (count-- > 0)
680 {
681 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
682
683 /* The address was accepted */
684
685 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
686 {
687 yield |= 1;
688 addr->transport_return = PENDING_OK;
689
690 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
691 ensure that any address-specific retry record is expunged. We do this both
692 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
693
694 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
695 {
696 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
697 sender_address);
698 retry_add_item(addr, altkey, rf_delete);
0756eb3c 699 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 700 }
0756eb3c
PH
701 }
702
703 /* Timeout while reading the response */
704
705 else if (errno == ETIMEDOUT)
706 {
707 int save_errno = errno;
708 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
709 "after RCPT TO:<%s>", host->name, host->address,
710 transport_rcpt_address(addr, include_affixes));
447d236c 711 set_errno(addrlist, save_errno, message, DEFER, FALSE);
0756eb3c 712 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 713 update_waiting = FALSE;
0756eb3c
PH
714 return -1;
715 }
716
717 /* Handle other errors in obtaining an SMTP response by returning -1. This
718 will cause all the addresses to be deferred. Restore the SMTP command in
719 big_buffer for which we are checking the response, so the error message
720 makes sense. */
721
722 else if (errno != 0 || buffer[0] == 0)
723 {
724 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
725 transport_rcpt_address(addr, include_affixes));
726 return -2;
727 }
728
729 /* Handle SMTP permanent and temporary response codes. */
730
731 else
732 {
733 addr->message =
447d236c 734 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
0756eb3c
PH
735 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
736 host->name, host->address, string_printing(buffer));
447d236c 737 setflag(addr, af_pass_message);
0756eb3c
PH
738 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
739
740 /* The response was 5xx */
741
742 if (buffer[0] == '5')
743 {
744 addr->transport_return = FAIL;
745 yield |= 2;
746 }
747
748 /* The response was 4xx */
749
750 else
751 {
0756eb3c
PH
752 addr->transport_return = DEFER;
753 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 754 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c
PH
755
756 /* Log temporary errors if there are more hosts to be tried. */
757
758 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
759
f6c332bd
PH
760 /* Do not put this message on the list of those waiting for specific
761 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 762
f6c332bd 763 update_waiting = FALSE;
0756eb3c 764
48c7f9e2
PH
765 /* Add a retry item for the address so that it doesn't get tried again
766 too soon. If address_retry_include_sender is true, add the sender address
767 to the retry key. */
0756eb3c 768
48c7f9e2
PH
769 if (address_retry_include_sender)
770 {
771 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
772 sender_address);
773 retry_add_item(addr, altkey, 0);
774 }
775 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
776 }
777 }
778 } /* Loop for next RCPT response */
779
780/* Update where to start at for the next block of responses, unless we
781have already handled all the addresses. */
782
783if (addr != NULL) *sync_addr = addr->next;
784
785/* Handle a response to DATA. If we have not had any good recipients, either
786previously or in this block, the response is ignored. */
787
788if (pending_DATA != 0 &&
789 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
790 {
791 int code;
792 uschar *msg;
447d236c 793 BOOL pass_message;
e97957bc
PH
794 if (pending_DATA > 0 || (yield & 1) != 0)
795 {
796 if (errno == 0 && buffer[0] == '4')
797 {
798 errno = ERRNO_DATA4XX;
799 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
800 }
801 return -3;
802 }
447d236c 803 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
804 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
805 "is in use and there were no good recipients\n", msg);
806 }
807
808/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
809present) received 3xx. If any RCPTs were handled and yielded anything other
810than 4xx, yield will be set non-zero. */
811
812return yield;
813}
814
815
816
817/*************************************************
818* Deliver address list to given host *
819*************************************************/
820
821/* If continue_hostname is not null, we get here only when continuing to
822deliver down an existing channel. The channel was passed as the standard
6c512171
PH
823input. TLS is never active on a passed channel; the previous process always
824closes it down before passing the connection on.
0756eb3c
PH
825
826Otherwise, we have to make a connection to the remote host, and do the
827initial protocol exchange.
828
829When running as an MUA wrapper, if the sender or any recipient is rejected,
830temporarily or permanently, we force failure for all recipients.
831
832Arguments:
833 addrlist chain of potential addresses to deliver; only those whose
834 transport_return field is set to PENDING_DEFER are currently
835 being processed; others should be skipped - they have either
836 been delivered to an earlier host or IP address, or been
837 failed by one of them.
838 host host to deliver to
839 host_af AF_INET or AF_INET6
2d280592 840 port default TCP/IP port to use, in host byte order
0756eb3c
PH
841 interface interface to bind to, or NULL
842 tblock transport instance block
843 copy_host TRUE if host set in addr->host_used must be copied, because
844 it is specific to this call of the transport
845 message_defer set TRUE if yield is OK, but all addresses were deferred
846 because of a non-recipient, non-host failure, that is, a
847 4xx response to MAIL FROM, DATA, or ".". This is a defer
848 that is specific to the message.
849 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
850 a second attempt after TLS initialization fails
851
852Returns: OK - the connection was made and the delivery attempted;
853 the result for each address is in its data block.
854 DEFER - the connection could not be made, or something failed
855 while setting up the SMTP session, or there was a
856 non-message-specific error, such as a timeout.
857 ERROR - a filter command is specified for this transport,
858 and there was a problem setting it up; OR helo_data
859 or add_headers or authenticated_sender is specified
860 for this transport, and the string failed to expand
861*/
862
863static int
864smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
865 uschar *interface, transport_instance *tblock, BOOL copy_host,
866 BOOL *message_defer, BOOL suppress_tls)
867{
868address_item *addr;
869address_item *sync_addr;
870address_item *first_addr = addrlist;
871int yield = OK;
872int address_count;
873int save_errno;
874int rc;
875time_t start_delivery_time = time(NULL);
876smtp_transport_options_block *ob =
877 (smtp_transport_options_block *)(tblock->options_block);
878BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 879BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
880BOOL ok = FALSE;
881BOOL send_rset = TRUE;
882BOOL send_quit = TRUE;
883BOOL setting_up = TRUE;
884BOOL completed_address = FALSE;
885BOOL esmtp = TRUE;
886BOOL pending_MAIL;
447d236c 887BOOL pass_message = FALSE;
fd98a5c6
JH
888#ifdef EXPERIMENTAL_PRDR
889BOOL prdr_offered = FALSE;
890BOOL prdr_active;
891#endif
0756eb3c
PH
892smtp_inblock inblock;
893smtp_outblock outblock;
894int max_rcpt = tblock->max_addresses;
f1513293 895uschar *igquotstr = US"";
0756eb3c 896uschar *local_authenticated_sender = authenticated_sender;
41c7c167 897uschar *helo_data = NULL;
0756eb3c
PH
898uschar *message = NULL;
899uschar new_message_id[MESSAGE_ID_LENGTH + 1];
900uschar *p;
901uschar buffer[4096];
902uschar inbuffer[4096];
903uschar outbuffer[1024];
904
905suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
906
907*message_defer = FALSE;
908smtp_command = US"initial connection";
909if (max_rcpt == 0) max_rcpt = 999999;
910
911/* Set up the buffer for reading SMTP response packets. */
912
913inblock.buffer = inbuffer;
914inblock.buffersize = sizeof(inbuffer);
915inblock.ptr = inbuffer;
916inblock.ptrend = inbuffer;
917
918/* Set up the buffer for holding SMTP commands while pipelining */
919
920outblock.buffer = outbuffer;
921outblock.buffersize = sizeof(outbuffer);
922outblock.ptr = outbuffer;
923outblock.cmd_count = 0;
924outblock.authenticating = FALSE;
925
6c512171
PH
926/* Reset the parameters of a TLS session. */
927
817d9f57
JH
928tls_in.bits = 0;
929tls_in.cipher = NULL; /* for back-compatible behaviour */
930tls_in.peerdn = NULL;
d6131a7d 931#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
817d9f57
JH
932tls_in.sni = NULL;
933#endif
934
935tls_out.bits = 0;
936tls_out.cipher = NULL; /* the one we may use for this transport */
937tls_out.peerdn = NULL;
938#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
939tls_out.sni = NULL;
5b456975 940#endif
6c512171 941
061b7ebd
PP
942#ifndef SUPPORT_TLS
943if (smtps)
944 {
945 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
946 return ERROR;
947 }
948#endif
949
0756eb3c
PH
950/* Make a connection to the host if this isn't a continued delivery, and handle
951the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
952specially so they can be identified for retries. */
953
954if (continue_hostname == NULL)
955 {
956 inblock.sock = outblock.sock =
957 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
9e4f5962 958 ob->keepalive, ob->dscp); /* This puts port into host->port */
4311097e 959
0756eb3c
PH
960 if (inblock.sock < 0)
961 {
962 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
447d236c 963 NULL, DEFER, FALSE);
0756eb3c
PH
964 return DEFER;
965 }
966
41c7c167
PH
967 /* Expand the greeting message while waiting for the initial response. (Makes
968 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
969 delayed till here so that $sending_interface and $sending_port are set. */
970
971 helo_data = expand_string(ob->helo_data);
972
0756eb3c
PH
973 /* The first thing is to wait for an initial OK response. The dreaded "goto"
974 is nevertheless a reasonably clean way of programming this kind of logic,
975 where you want to escape on any error. */
976
061b7ebd
PP
977 if (!smtps)
978 {
979 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
980 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 981
061b7ebd
PP
982 /* Now check if the helo_data expansion went well, and sign off cleanly if
983 it didn't. */
41c7c167 984
061b7ebd
PP
985 if (helo_data == NULL)
986 {
987 uschar *message = string_sprintf("failed to expand helo_data: %s",
988 expand_string_message);
989 set_errno(addrlist, 0, message, DEFER, FALSE);
990 yield = DEFER;
991 goto SEND_QUIT;
992 }
41c7c167
PH
993 }
994
0756eb3c
PH
995/** Debugging without sending a message
996addrlist->transport_return = DEFER;
997goto SEND_QUIT;
998**/
999
1000 /* Errors that occur after this point follow an SMTP command, which is
1001 left in big_buffer by smtp_write_command() for use in error messages. */
1002
1003 smtp_command = big_buffer;
1004
1005 /* Tell the remote who we are...
1006
1007 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1008 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1009 greeting is of this form. The assumption was that the far end supports it
1010 properly... but experience shows that there are some that give 5xx responses,
1011 even though the banner includes "ESMTP" (there's a bloody-minded one that
1012 says "ESMTP not spoken here"). Cope with that case.
1013
1014 September 2000: Time has passed, and it seems reasonable now to always send
1015 EHLO at the start. It is also convenient to make the change while installing
1016 the TLS stuff.
1017
1018 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1019 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1020 would be no way to send out the mails, so there is now a host list
1021 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1022 PIPELINING problem as well. Maybe it can also be useful to cure other
1023 problems with broken servers.
1024
1025 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1026 Then somebody tried it with a Microsoft mailer... It seems that all other
1027 mailers use upper case for some reason (the RFC is quite clear about case
1028 independence) so, for peace of mind, I gave in. */
1029
1030 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1031 host->name, host->address, NULL) != OK;
1032
061b7ebd
PP
1033 /* Alas; be careful, since this goto is not an error-out, so conceivably
1034 we might set data between here and the target which we assume to exist
1035 and be usable. I can see this coming back to bite us. */
1036 #ifdef SUPPORT_TLS
1037 if (smtps)
1038 {
1039 tls_offered = TRUE;
1040 suppress_tls = FALSE;
1041 ob->tls_tempfail_tryclear = FALSE;
1042 smtp_command = US"SSL-on-connect";
1043 goto TLS_NEGOTIATE;
1044 }
1045 #endif
1046
0756eb3c
PH
1047 if (esmtp)
1048 {
1049 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1050 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1051 goto SEND_FAILED;
1052 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1053 ob->command_timeout))
1054 {
1055 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1056 esmtp = FALSE;
1057 }
1058 }
1059 else
1060 {
1061 DEBUG(D_transport)
1062 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1063 }
1064
1065 if (!esmtp)
1066 {
1067 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1068 goto SEND_FAILED;
1069 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1070 ob->command_timeout)) goto RESPONSE_FAILED;
1071 }
1072
f1513293
PH
1073 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1074 lmtp_ignore_quota option was set. */
1075
1076 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1077 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1078 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1079
0756eb3c
PH
1080 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1081
1082 #ifdef SUPPORT_TLS
1083 tls_offered = esmtp &&
1084 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1085 PCRE_EOPT, NULL, 0) >= 0;
1086 #endif
fd98a5c6
JH
1087
1088 #ifdef EXPERIMENTAL_PRDR
1089 prdr_offered = esmtp &&
1090 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1091 PCRE_EOPT, NULL, 0) >= 0) &&
1092 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1093 host->address, NULL) == OK);
1094
1095 if (prdr_offered)
1096 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1097 #endif
0756eb3c
PH
1098 }
1099
1100/* For continuing deliveries down the same channel, the socket is the standard
1101input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1102below). Set up the pointer to where subsequent commands will be left, for
1103error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1104set from the command line if they were set in the process that passed the
1105connection on. */
1106
1107else
1108 {
1109 inblock.sock = outblock.sock = fileno(stdin);
1110 smtp_command = big_buffer;
4311097e 1111 host->port = port; /* Record the port that was used */
0756eb3c
PH
1112 }
1113
1114/* If TLS is available on this connection, whether continued or not, attempt to
1115start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1116send another EHLO - the server may give a different answer in secure mode. We
1117use a separate buffer for reading the response to STARTTLS so that if it is
1118negative, the original EHLO data is available for subsequent analysis, should
1119the client not be required to use TLS. If the response is bad, copy the buffer
1120for error analysis. */
1121
1122#ifdef SUPPORT_TLS
1123if (tls_offered && !suppress_tls &&
1124 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1125 host->address, NULL) != OK)
1126 {
1127 uschar buffer2[4096];
1128 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1129 goto SEND_FAILED;
1130
1131 /* If there is an I/O error, transmission of this message is deferred. If
1132 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1133 false, we also defer. However, if there is a temporary rejection of STARTTLS
1134 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1135 STARTTLS, we carry on. This means we will try to send the message in clear,
1136 unless the host is in hosts_require_tls (tested below). */
1137
1138 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1139 ob->command_timeout))
1140 {
0756eb3c
PH
1141 if (errno != 0 || buffer2[0] == 0 ||
1142 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1143 {
1144 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1145 goto RESPONSE_FAILED;
0dda4340 1146 }
0756eb3c
PH
1147 }
1148
1149 /* STARTTLS accepted: try to negotiate a TLS session. */
1150
1151 else
061b7ebd 1152 TLS_NEGOTIATE:
0756eb3c 1153 {
83da1223
PH
1154 int rc = tls_client_start(inblock.sock,
1155 host,
1156 addrlist,
0756eb3c
PH
1157 ob->tls_certificate,
1158 ob->tls_privatekey,
3f0945ff 1159 ob->tls_sni,
0756eb3c
PH
1160 ob->tls_verify_certificates,
1161 ob->tls_crl,
1162 ob->tls_require_ciphers,
f5d78688
JH
1163#ifdef EXPERIMENTAL_OCSP
1164 ob->hosts_require_ocsp,
1165#endif
54c90be1 1166 ob->tls_dh_min_bits,
0756eb3c
PH
1167 ob->command_timeout);
1168
1169 /* TLS negotiation failed; give an error. From outside, this function may
1170 be called again to try in clear on a new connection, if the options permit
1171 it for this host. */
1172
1173 if (rc != OK)
1174 {
1175 save_errno = ERRNO_TLSFAILURE;
1176 message = US"failure while setting up TLS session";
1177 send_quit = FALSE;
1178 goto TLS_FAILED;
1179 }
1180
1181 /* TLS session is set up */
1182
1183 for (addr = addrlist; addr != NULL; addr = addr->next)
1184 {
5ca2a9a1
PH
1185 if (addr->transport_return == PENDING_DEFER)
1186 {
817d9f57
JH
1187 addr->cipher = tls_out.cipher;
1188 addr->peerdn = tls_out.peerdn;
5ca2a9a1 1189 }
0756eb3c
PH
1190 }
1191 }
1192 }
1193
061b7ebd
PP
1194/* if smtps, we'll have smtp_command set to something else; always safe to
1195reset it here. */
1196smtp_command = big_buffer;
1197
41c7c167
PH
1198/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1199helo_data is null, we are dealing with a connection that was passed from
1200another process, and so we won't have expanded helo_data above. We have to
1201expand it here. $sending_ip_address and $sending_port are set up right at the
1202start of the Exim process (in exim.c). */
0756eb3c 1203
817d9f57 1204if (tls_out.active >= 0)
0756eb3c 1205 {
061b7ebd 1206 char *greeting_cmd;
41c7c167
PH
1207 if (helo_data == NULL)
1208 {
1209 helo_data = expand_string(ob->helo_data);
1210 if (helo_data == NULL)
1211 {
1212 uschar *message = string_sprintf("failed to expand helo_data: %s",
1213 expand_string_message);
1214 set_errno(addrlist, 0, message, DEFER, FALSE);
1215 yield = DEFER;
1216 goto SEND_QUIT;
1217 }
1218 }
1219
0d0e4455 1220 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1221 if (smtps)
1222 {
1223 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1224 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1225 }
1226
1227 if (esmtp)
1228 greeting_cmd = "EHLO";
1229 else
1230 {
1231 greeting_cmd = "HELO";
1232 DEBUG(D_transport)
1233 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1234 }
1235
1236 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1237 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1238 goto SEND_FAILED;
1239 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1240 ob->command_timeout))
1241 goto RESPONSE_FAILED;
1242 }
1243
1244/* If the host is required to use a secure channel, ensure that we
1245have one. */
1246
1247else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1248 host->address, NULL) == OK)
1249 {
1250 save_errno = ERRNO_TLSREQUIRED;
1251 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1252 host->name, host->address,
1253 tls_offered? "an attempt to start TLS failed" :
1254 "the server did not offer TLS support");
1255 goto TLS_FAILED;
1256 }
1257#endif
1258
1259/* If TLS is active, we have just started it up and re-done the EHLO command,
1260so its response needs to be analyzed. If TLS is not active and this is a
1261continued session down a previously-used socket, we haven't just done EHLO, so
1262we skip this. */
1263
1264if (continue_hostname == NULL
1265 #ifdef SUPPORT_TLS
817d9f57 1266 || tls_out.active >= 0
0756eb3c
PH
1267 #endif
1268 )
1269 {
1270 int require_auth;
1271 uschar *fail_reason = US"server did not advertise AUTH support";
1272
f1513293
PH
1273 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1274 lmtp_ignore_quota option was set. */
1275
1276 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1277 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1278 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1279
0756eb3c
PH
1280 /* If the response to EHLO specified support for the SIZE parameter, note
1281 this, provided size_addition is non-negative. */
1282
1283 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1284 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1285 PCRE_EOPT, NULL, 0) >= 0;
1286
1287 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1288 the current host, esmtp will be false, so PIPELINING can never be used. If
1289 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c
PH
1290
1291 smtp_use_pipelining = esmtp &&
c51b8e75
PH
1292 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1293 host->address, NULL) != OK &&
0756eb3c
PH
1294 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1295 PCRE_EOPT, NULL, 0) >= 0;
1296
1297 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1298 smtp_use_pipelining? "" : "not ");
1299
fd98a5c6
JH
1300#ifdef EXPERIMENTAL_PRDR
1301 prdr_offered = esmtp &&
1302 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1303 PCRE_EOPT, NULL, 0) >= 0 &&
1304 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1305 host->address, NULL) == OK;
1306
1307 if (prdr_offered)
1308 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1309#endif
1310
0756eb3c
PH
1311 /* Note if the response to EHLO specifies support for the AUTH extension.
1312 If it has, check that this host is one we want to authenticate to, and do
1313 the business. The host name and address must be available when the
1314 authenticator's client driver is running. */
1315
1316 smtp_authenticated = FALSE;
018c60d7 1317 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
0756eb3c
PH
1318 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
1319 host->name, host->address, NULL);
1320
1321 if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1322 {
1323 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1324 expand_nmax = -1; /* reset */
1325
1326 /* Must not do this check until after we have saved the result of the
1327 regex match above. */
1328
1329 if (require_auth == OK ||
1330 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
1331 host->address, NULL) == OK)
1332 {
1333 auth_instance *au;
1334 fail_reason = US"no common mechanisms were found";
1335
1336 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1337
1338 /* Scan the configured authenticators looking for one which is configured
6c512171
PH
1339 for use as a client, which is not suppressed by client_condition, and
1340 whose name matches an authentication mechanism supported by the server.
1341 If one is found, attempt to authenticate by calling its client function.
1342 */
0756eb3c
PH
1343
1344 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1345 {
1346 uschar *p = names;
6c512171
PH
1347 if (!au->client ||
1348 (au->client_condition != NULL &&
1349 !expand_check_condition(au->client_condition, au->name,
1350 US"client authenticator")))
1351 {
1352 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1353 au->name,
1354 (au->client)? "client_condition is false" :
1355 "not configured as a client");
1356 continue;
1357 }
0756eb3c
PH
1358
1359 /* Loop to scan supported server mechanisms */
1360
1361 while (*p != 0)
1362 {
1363 int rc;
1364 int len = Ustrlen(au->public_name);
1365 while (isspace(*p)) p++;
1366
1367 if (strncmpic(au->public_name, p, len) != 0 ||
1368 (p[len] != 0 && !isspace(p[len])))
1369 {
1370 while (*p != 0 && !isspace(*p)) p++;
1371 continue;
1372 }
1373
1374 /* Found data for a listed mechanism. Call its client entry. Set
1375 a flag in the outblock so that data is overwritten after sending so
1376 that reflections don't show it. */
1377
1378 fail_reason = US"authentication attempt(s) failed";
1379 outblock.authenticating = TRUE;
1380 rc = (au->info->clientcode)(au, &inblock, &outblock,
1381 ob->command_timeout, buffer, sizeof(buffer));
1382 outblock.authenticating = FALSE;
1383 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1384 au->name, rc);
1385
1386 /* A temporary authentication failure must hold up delivery to
1387 this host. After a permanent authentication failure, we carry on
1388 to try other authentication methods. If all fail hard, try to
1389 deliver the message unauthenticated unless require_auth was set. */
1390
1391 switch(rc)
1392 {
1393 case OK:
1394 smtp_authenticated = TRUE; /* stops the outer loop */
6f123593
JH
1395 client_authenticator = au->name;
1396 if (au->set_client_id != NULL)
1397 client_authenticated_id = expand_string(au->set_client_id);
0756eb3c
PH
1398 break;
1399
1400 /* Failure after writing a command */
1401
1402 case FAIL_SEND:
1403 goto SEND_FAILED;
1404
1405 /* Failure after reading a response */
1406
1407 case FAIL:
1408 if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED;
1409 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1410 au->name, host->name, host->address, buffer);
1411 break;
1412
1413 /* Failure by some other means. In effect, the authenticator
1414 decided it wasn't prepared to handle this case. Typically this
1415 is the result of "fail" in an expansion string. Do we need to
4730f942
PH
1416 log anything here? Feb 2006: a message is now put in the buffer
1417 if logging is required. */
0756eb3c
PH
1418
1419 case CANCELLED:
4730f942
PH
1420 if (*buffer != 0)
1421 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1422 "authentication H=%s [%s] %s", au->name, host->name,
1423 host->address, buffer);
0756eb3c
PH
1424 break;
1425
1426 /* Internal problem, message in buffer. */
1427
1428 case ERROR:
1429 yield = ERROR;
447d236c 1430 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
0756eb3c
PH
1431 goto SEND_QUIT;
1432 }
1433
1434 break; /* If not authenticated, try next authenticator */
1435 } /* Loop for scanning supported server mechanisms */
1436 } /* Loop for further authenticators */
1437 }
1438 }
1439
1440 /* If we haven't authenticated, but are required to, give up. */
1441
1442 if (require_auth == OK && !smtp_authenticated)
1443 {
1444 yield = DEFER;
1445 set_errno(addrlist, ERRNO_AUTHFAIL,
447d236c
PH
1446 string_sprintf("authentication required but %s", fail_reason), DEFER,
1447 FALSE);
0756eb3c
PH
1448 goto SEND_QUIT;
1449 }
1450 }
1451
1452/* The setting up of the SMTP call is now complete. Any subsequent errors are
1453message-specific. */
1454
1455setting_up = FALSE;
1456
1457/* If there is a filter command specified for this transport, we can now
1458set it up. This cannot be done until the identify of the host is known. */
1459
1460if (tblock->filter_command != NULL)
1461 {
1462 BOOL rc;
1463 uschar buffer[64];
1464 sprintf(CS buffer, "%.50s transport", tblock->name);
1465 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1466 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1467 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1468
1469 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1470 yield ERROR. */
1471
1472 if (!rc)
1473 {
447d236c
PH
1474 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1475 FALSE);
0756eb3c
PH
1476 yield = ERROR;
1477 goto SEND_QUIT;
1478 }
1479 }
1480
1481
1482/* For messages that have more than the maximum number of envelope recipients,
1483we want to send several transactions down the same SMTP connection. (See
1484comments in deliver.c as to how this reconciles, heuristically, with
1485remote_max_parallel.) This optimization was added to Exim after the following
1486code was already working. The simplest way to put it in without disturbing the
1487code was to use a goto to jump back to this point when there is another
1488transaction to handle. */
1489
1490SEND_MESSAGE:
1491sync_addr = first_addr;
1492address_count = 0;
1493ok = FALSE;
1494send_rset = TRUE;
1495completed_address = FALSE;
1496
1497
1498/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1499qualification, send it, adding something to the message size to allow for
1500imprecision and things that get added en route. Exim keeps the number of lines
1501in a message, so we can give an accurate value for the original message, but we
1502need some additional to handle added headers. (Double "." characters don't get
1503included in the count.) */
1504
1505p = buffer;
1506*p = 0;
1507
1508if (smtp_use_size)
1509 {
1510 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1511 while (*p) p++;
1512 }
1513
fd98a5c6
JH
1514#ifdef EXPERIMENTAL_PRDR
1515prdr_active = FALSE;
1516if (prdr_offered)
1517 {
1518 for (addr = first_addr; addr; addr = addr->next)
1519 if (addr->transport_return == PENDING_DEFER)
1520 {
1521 for (addr = addr->next; addr; addr = addr->next)
1522 if (addr->transport_return == PENDING_DEFER)
1523 { /* at least two recipients to send */
1524 prdr_active = TRUE;
1525 sprintf(CS p, " PRDR"); p += 5;
1526 goto prdr_is_active;
1527 }
1528 break;
1529 }
1530 }
1531prdr_is_active:
1532#endif
1533
6b62e899
JH
1534/* If an authenticated_sender override has been specified for this transport
1535instance, expand it. If the expansion is forced to fail, and there was already
1536an authenticated_sender for this message, the original value will be used.
1537Other expansion failures are serious. An empty result is ignored, but there is
1538otherwise no check - this feature is expected to be used with LMTP and other
1539cases where non-standard addresses (e.g. without domains) might be required. */
1540
1541if (ob->authenticated_sender != NULL)
1542 {
1543 uschar *new = expand_string(ob->authenticated_sender);
1544 if (new == NULL)
1545 {
1546 if (!expand_string_forcedfail)
1547 {
1548 uschar *message = string_sprintf("failed to expand "
1549 "authenticated_sender: %s", expand_string_message);
1550 set_errno(addrlist, 0, message, DEFER, FALSE);
1551 return ERROR;
1552 }
1553 }
1554 else if (new[0] != 0) local_authenticated_sender = new;
1555 }
1556
0756eb3c
PH
1557/* Add the authenticated sender address if present */
1558
382afc6b
PH
1559if ((smtp_authenticated || ob->authenticated_sender_force) &&
1560 local_authenticated_sender != NULL)
0756eb3c
PH
1561 {
1562 string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s",
1563 auth_xtextencode(local_authenticated_sender,
1564 Ustrlen(local_authenticated_sender)));
c8e2fc1e 1565 client_authenticated_sender = string_copy(local_authenticated_sender);
0756eb3c
PH
1566 }
1567
1568/* From here until we send the DATA command, we can make use of PIPELINING
1569if the server host supports it. The code has to be able to check the responses
1570at any point, for when the buffer fills up, so we write it totally generally.
1571When PIPELINING is off, each command written reports that it has flushed the
1572buffer. */
1573
1574pending_MAIL = TRUE; /* The block starts with MAIL */
1575
1576rc = smtp_write_command(&outblock, smtp_use_pipelining,
1577 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1578mail_command = string_copy(big_buffer); /* Save for later error message */
1579
1580switch(rc)
1581 {
1582 case -1: /* Transmission error */
1583 goto SEND_FAILED;
1584
1585 case +1: /* Block was sent */
1586 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc
PH
1587 ob->command_timeout))
1588 {
1589 if (errno == 0 && buffer[0] == '4')
1590 {
1591 errno = ERRNO_MAIL4XX;
1592 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1593 }
1594 goto RESPONSE_FAILED;
1595 }
0756eb3c
PH
1596 pending_MAIL = FALSE;
1597 break;
1598 }
1599
1600/* Pass over all the relevant recipient addresses for this host, which are the
1601ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1602several before we have to read the responses for those seen so far. This
1603checking is done by a subroutine because it also needs to be done at the end.
1604Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1605the next one if not all are sent.
1606
1607In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1608last address because we want to abort if any recipients have any kind of
1609problem, temporary or permanent. We know that all recipient addresses will have
1610the PENDING_DEFER status, because only one attempt is ever made, and we know
1611that max_rcpt will be large, so all addresses will be done at once. */
1612
1613for (addr = first_addr;
1614 address_count < max_rcpt && addr != NULL;
1615 addr = addr->next)
1616 {
1617 int count;
1618 BOOL no_flush;
1619
1620 if (addr->transport_return != PENDING_DEFER) continue;
1621
1622 address_count++;
1623 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1624
1625 /* Now send the RCPT command, and process outstanding responses when
1626 necessary. After a timeout on RCPT, we just end the function, leaving the
1627 yield as OK, because this error can often mean that there is a problem with
1628 just one address, so we don't want to delay the host. */
1629
f1513293
PH
1630 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1631 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
0756eb3c
PH
1632 if (count < 0) goto SEND_FAILED;
1633 if (count > 0)
1634 {
1635 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
1636 &sync_addr, host, count, ob->address_retry_include_sender,
1637 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1638 sizeof(buffer)))
0756eb3c
PH
1639 {
1640 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1641 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1642 break;
1643
1644 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1645 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1646 case 0: /* No 2xx or 5xx, but no probs */
1647 break;
1648
1649 case -1: goto END_OFF; /* Timeout on RCPT */
1650 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1651 }
1652 pending_MAIL = FALSE; /* Dealt with MAIL */
1653 }
1654 } /* Loop for next address */
1655
1656/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1657permanently or temporarily. We should have flushed and synced after the last
1658RCPT. */
1659
1660if (mua_wrapper)
1661 {
1662 address_item *badaddr;
1663 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1664 {
1665 if (badaddr->transport_return != PENDING_OK) break;
1666 }
1667 if (badaddr != NULL)
1668 {
447d236c
PH
1669 set_errno(addrlist, 0, badaddr->message, FAIL,
1670 testflag(badaddr, af_pass_message));
0756eb3c
PH
1671 ok = FALSE;
1672 }
1673 }
1674
1675/* If ok is TRUE, we know we have got at least one good recipient, and must now
1676send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1677have a good recipient buffered up if we are pipelining. We don't want to waste
1678time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1679are pipelining. The responses are all handled by sync_responses(). */
1680
1681if (ok || (smtp_use_pipelining && !mua_wrapper))
1682 {
1683 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1684 if (count < 0) goto SEND_FAILED;
1685 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
1686 host, count, ob->address_retry_include_sender, pending_MAIL,
1687 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
1688 {
1689 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1690 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1691 break;
1692
1693 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1694 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1695 case 0: break; /* No 2xx or 5xx, but no probs */
1696
1697 case -1: goto END_OFF; /* Timeout on RCPT */
1698 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1699 }
1700 }
1701
1702/* Save the first address of the next batch. */
1703
1704first_addr = addr;
1705
1706/* If there were no good recipients (but otherwise there have been no
1707problems), just set ok TRUE, since we have handled address-specific errors
1708already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1709for handling the SMTP dot-handling protocol, flagging to apply to headers as
1710well as body. Set the appropriate timeout value to be used for each chunk.
1711(Haven't been able to make it work using select() for writing yet.) */
1712
1713if (!ok) ok = TRUE; else
1714 {
1715 sigalrm_seen = FALSE;
1716 transport_write_timeout = ob->data_timeout;
1717 smtp_command = US"sending data block"; /* For error messages */
1718 DEBUG(D_transport|D_v)
1719 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1720 transport_count = 0;
80a47a2c 1721#ifndef DISABLE_DKIM
4cd12fe9
TK
1722 ok = dkim_transport_write_message(addrlist, inblock.sock,
1723 topt_use_crlf | topt_end_dot | topt_escape_headers |
1724 (tblock->body_only? topt_no_headers : 0) |
1725 (tblock->headers_only? topt_no_body : 0) |
1726 (tblock->return_path_add? topt_add_return_path : 0) |
1727 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1728 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1729 0, /* No size limit */
1730 tblock->add_headers, tblock->remove_headers,
1731 US".", US"..", /* Escaping strings */
1732 tblock->rewrite_rules, tblock->rewrite_existflags,
1733 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 1734 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
1735 );
1736#else
0756eb3c
PH
1737 ok = transport_write_message(addrlist, inblock.sock,
1738 topt_use_crlf | topt_end_dot | topt_escape_headers |
1739 (tblock->body_only? topt_no_headers : 0) |
1740 (tblock->headers_only? topt_no_body : 0) |
1741 (tblock->return_path_add? topt_add_return_path : 0) |
1742 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1743 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1744 0, /* No size limit */
1745 tblock->add_headers, tblock->remove_headers,
1746 US".", US"..", /* Escaping strings */
1747 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 1748#endif
0756eb3c
PH
1749
1750 /* transport_write_message() uses write() because it is called from other
1751 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1752 it can exit with "Broken pipe" as its error. This really means that the
1753 socket got closed at the far end. */
1754
1755 transport_write_timeout = 0; /* for subsequent transports */
1756
1757 /* Failure can either be some kind of I/O disaster (including timeout),
1758 or the failure of a transport filter or the expansion of added headers. */
1759
1760 if (!ok)
1761 {
1762 buffer[0] = 0; /* There hasn't been a response */
1763 goto RESPONSE_FAILED;
1764 }
1765
1766 /* We used to send the terminating "." explicitly here, but because of
1767 buffering effects at both ends of TCP/IP connections, you don't gain
1768 anything by keeping it separate, so it might as well go in the final
1769 data buffer for efficiency. This is now done by setting the topt_end_dot
1770 flag above. */
1771
1772 smtp_command = US"end of data";
1773
fd98a5c6
JH
1774#ifdef EXPERIMENTAL_PRDR
1775 /* For PRDR we optionally get a partial-responses warning
1776 * followed by the individual responses, before going on with
1777 * the overall response. If we don't get the warning then deal
1778 * with per non-PRDR. */
1779 if(prdr_active)
1780 {
1781 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1782 ob->final_timeout);
1783 if (!ok && errno == 0)
1784 switch(buffer[0])
1785 {
1786 case '2': prdr_active = FALSE;
1787 ok = TRUE;
1788 break;
1789 case '4': errno = ERRNO_DATA4XX;
1790 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1791 break;
1792 }
1793 }
1794 else
1795#endif
1796
1797 /* For non-PRDR SMTP, we now read a single response that applies to the
1798 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 1799
e97957bc
PH
1800 if (!lmtp)
1801 {
1802 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1803 ob->final_timeout);
1804 if (!ok && errno == 0 && buffer[0] == '4')
1805 {
1806 errno = ERRNO_DATA4XX;
1807 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1808 }
1809 }
0756eb3c
PH
1810
1811 /* For LMTP, we get back a response for every RCPT command that we sent;
1812 some may be accepted and some rejected. For those that get a response, their
1813 status is fixed; any that are accepted have been handed over, even if later
1814 responses crash - at least, that's how I read RFC 2033.
1815
1816 If all went well, mark the recipient addresses as completed, record which
1817 host/IPaddress they were delivered to, and cut out RSET when sending another
1818 message down the same channel. Write the completed addresses to the journal
1819 now so that they are recorded in case there is a crash of hardware or
1820 software before the spool gets updated. Also record the final SMTP
1821 confirmation if needed (for SMTP only). */
1822
1823 if (ok)
1824 {
1825 int flag = '=';
1826 int delivery_time = (int)(time(NULL) - start_delivery_time);
1827 int len;
1828 host_item *thost;
1829 uschar *conf = NULL;
1830 send_rset = FALSE;
1831
1832 /* Make a copy of the host if it is local to this invocation
1833 of the transport. */
1834
1835 if (copy_host)
1836 {
1837 thost = store_get(sizeof(host_item));
1838 *thost = *host;
1839 thost->name = string_copy(host->name);
1840 thost->address = string_copy(host->address);
1841 }
1842 else thost = host;
1843
1844 /* Set up confirmation if needed - applies only to SMTP */
1845
1846 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1847 {
1848 uschar *s = string_printing(buffer);
1849 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1850 }
1851
fd98a5c6 1852 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
1853 each one. */
1854
1855 for (addr = addrlist; addr != first_addr; addr = addr->next)
1856 {
1857 if (addr->transport_return != PENDING_OK) continue;
1858
1859 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1860 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
1861 address. For temporary errors, add a retry item for the address so that
1862 it doesn't get tried again too soon. */
0756eb3c 1863
fd98a5c6
JH
1864#ifdef EXPERIMENTAL_PRDR
1865 if (lmtp || prdr_active)
1866#else
0756eb3c 1867 if (lmtp)
fd98a5c6 1868#endif
0756eb3c
PH
1869 {
1870 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1871 ob->final_timeout))
1872 {
1873 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6
JH
1874 addr->message = string_sprintf(
1875#ifdef EXPERIMENTAL_PRDR
1876 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
1877#else
1878 "LMTP error after %s: %s",
1879#endif
0756eb3c 1880 big_buffer, string_printing(buffer));
75def545
PH
1881 setflag(addr, af_pass_message); /* Allow message to go to user */
1882 if (buffer[0] == '5')
1883 addr->transport_return = FAIL;
1884 else
1885 {
e97957bc
PH
1886 errno = ERRNO_DATA4XX;
1887 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 1888 addr->transport_return = DEFER;
fd98a5c6
JH
1889#ifdef EXPERIMENTAL_PRDR
1890 if (!prdr_active)
1891#endif
1892 retry_add_item(addr, addr->address_retry_key, 0);
75def545 1893 }
0756eb3c
PH
1894 continue;
1895 }
1896 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
1897 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1898 {
1899 uschar *s = string_printing(buffer);
1900 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1901 }
0756eb3c
PH
1902 }
1903
1904 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 1905 actual host that was used. */
0756eb3c
PH
1906
1907 addr->transport_return = OK;
1908 addr->more_errno = delivery_time;
0756eb3c
PH
1909 addr->host_used = thost;
1910 addr->special_action = flag;
1911 addr->message = conf;
fd98a5c6
JH
1912#ifdef EXPERIMENTAL_PRDR
1913 if (prdr_active) addr->flags |= af_prdr_used;
1914#endif
0756eb3c
PH
1915 flag = '-';
1916
fd98a5c6
JH
1917#ifdef EXPERIMENTAL_PRDR
1918 if (!prdr_active)
1919#endif
1920 {
1921 /* Update the journal. For homonymic addresses, use the base address plus
1922 the transport name. See lots of comments in deliver.c about the reasons
1923 for the complications when homonyms are involved. Just carry on after
1924 write error, as it may prove possible to update the spool file later. */
1925
1926 if (testflag(addr, af_homonym))
1927 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1928 else
1929 sprintf(CS buffer, "%.500s\n", addr->unique);
1930
1931 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
1932 len = Ustrlen(CS buffer);
1933 if (write(journal_fd, buffer, len) != len)
1934 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1935 "%s: %s", buffer, strerror(errno));
1936 }
0756eb3c
PH
1937 }
1938
fd98a5c6
JH
1939#ifdef EXPERIMENTAL_PRDR
1940 if (prdr_active)
1941 {
1942 /* PRDR - get the final, overall response. For any non-success
1943 upgrade all the address statuses. */
1944 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1945 ob->final_timeout);
1946 if (!ok)
1947 {
1948 if(errno == 0 && buffer[0] == '4')
1949 {
1950 errno = ERRNO_DATA4XX;
1951 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1952 }
1953 for (addr = addrlist; addr != first_addr; addr = addr->next)
1954 if (buffer[0] == '5' || addr->transport_return == OK)
1955 addr->transport_return = PENDING_OK; /* allow set_errno action */
1956 goto RESPONSE_FAILED;
1957 }
1958
1959 /* Update the journal, or setup retry. */
1960 for (addr = addrlist; addr != first_addr; addr = addr->next)
1961 if (addr->transport_return == OK)
1962 {
1963 if (testflag(addr, af_homonym))
1964 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1965 else
1966 sprintf(CS buffer, "%.500s\n", addr->unique);
1967
1968 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
1969 len = Ustrlen(CS buffer);
1970 if (write(journal_fd, buffer, len) != len)
1971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
1972 "%s: %s", buffer, strerror(errno));
1973 }
1974 else if (addr->transport_return == DEFER)
1975 retry_add_item(addr, addr->address_retry_key, -2);
1976 }
1977#endif
1978
0756eb3c
PH
1979 /* Ensure the journal file is pushed out to disk. */
1980
54fc8428 1981 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
1982 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
1983 strerror(errno));
1984 }
1985 }
1986
1987
1988/* Handle general (not specific to one address) failures here. The value of ok
1989is used to skip over this code on the falling through case. A timeout causes a
1990deferral. Other errors may defer or fail according to the response code, and
1991may set up a special errno value, e.g. after connection chopped, which is
1992assumed if errno == 0 and there is no text in the buffer. If control reaches
1993here during the setting up phase (i.e. before MAIL FROM) then always defer, as
1994the problem is not related to this specific message. */
1995
1996if (!ok)
1997 {
1998 int code;
1999
2000 RESPONSE_FAILED:
2001 save_errno = errno;
2002 message = NULL;
2003 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2004 buffer, &code, &message, &pass_message);
0756eb3c
PH
2005 goto FAILED;
2006
2007 SEND_FAILED:
2008 save_errno = errno;
2009 code = '4';
2010 message = US string_sprintf("send() to %s [%s] failed: %s",
2011 host->name, host->address, strerror(save_errno));
2012 send_quit = FALSE;
2013 goto FAILED;
2014
2015 /* This label is jumped to directly when a TLS negotiation has failed,
2016 or was not done for a host for which it is required. Values will be set
2017 in message and save_errno, and setting_up will always be true. Treat as
2018 a temporary error. */
2019
2020 #ifdef SUPPORT_TLS
2021 TLS_FAILED:
2022 code = '4';
2023 #endif
2024
2025 /* If the failure happened while setting up the call, see if the failure was
2026 a 5xx response (this will either be on connection, or following HELO - a 5xx
2027 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2028 never going to accept them. For other errors during setting up (timeouts or
2029 whatever), defer all addresses, and yield DEFER, so that the host is not
2030 tried again for a while. */
2031
2032 FAILED:
2033 ok = FALSE; /* For when reached by GOTO */
2034
2035 if (setting_up)
2036 {
2037 if (code == '5')
2038 {
447d236c 2039 set_errno(addrlist, save_errno, message, FAIL, pass_message);
0756eb3c
PH
2040 }
2041 else
2042 {
447d236c 2043 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2044 yield = DEFER;
2045 }
2046 }
2047
e97957bc 2048 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2049 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2050 the contents of the message rather than a real error on the connection. These
2051 cases are treated in the same way as a 4xx response. This next bit of code
2052 does the classification. */
0756eb3c 2053
e97957bc 2054 else
0756eb3c 2055 {
e97957bc 2056 BOOL message_error;
0756eb3c 2057
e97957bc
PH
2058 switch(save_errno)
2059 {
2060 case 0:
2061 case ERRNO_MAIL4XX:
2062 case ERRNO_DATA4XX:
2063 message_error = TRUE;
2064 break;
0756eb3c 2065
e97957bc
PH
2066 case ETIMEDOUT:
2067 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2068 Ustrncmp(smtp_command,"end ",4) == 0;
2069 break;
2070
2071 case ERRNO_SMTPCLOSED:
2072 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2073 break;
2074
2075 default:
2076 message_error = FALSE;
2077 break;
2078 }
0756eb3c 2079
e97957bc 2080 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2081
e97957bc
PH
2082 (a) negative response or timeout after MAIL
2083 (b) negative response after DATA
2084 (c) negative response or timeout or dropped connection after "."
0756eb3c 2085
e97957bc
PH
2086 It won't be a negative response or timeout after RCPT, as that is dealt
2087 with separately above. The action in all cases is to set an appropriate
2088 error code for all the addresses, but to leave yield set to OK because the
2089 host itself has not failed. Of course, it might in practice have failed
2090 when we've had a timeout, but if so, we'll discover that at the next
2091 delivery attempt. For a temporary error, set the message_defer flag, and
2092 write to the logs for information if this is not the last host. The error
2093 for the last host will be logged as part of the address's log line. */
2094
2095 if (message_error)
0756eb3c 2096 {
e97957bc
PH
2097 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2098 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2099 pass_message);
2100
2101 /* If there's an errno, the message contains just the identity of
2102 the host. */
2103
2104 if (code != '5') /* Anything other than 5 is treated as temporary */
2105 {
2106 if (save_errno > 0)
2107 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2108 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2109 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2110 *message_defer = TRUE;
2111 }
2112 }
2113
2114 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2115 ".", or some other transportation error. We defer all addresses and yield
2116 DEFER, except for the case of failed add_headers expansion, or a transport
2117 filter failure, when the yield should be ERROR, to stop it trying other
2118 hosts. */
2119
2120 else
2121 {
2122 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2123 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2124 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2125 }
2126 }
2127 }
2128
2129
2130/* If all has gone well, send_quit will be set TRUE, implying we can end the
2131SMTP session tidily. However, if there were too many addresses to send in one
2132message (indicated by first_addr being non-NULL) we want to carry on with the
2133rest of them. Also, it is desirable to send more than one message down the SMTP
2134connection if there are several waiting, provided we haven't already sent so
2135many as to hit the configured limit. The function transport_check_waiting looks
2136for a waiting message and returns its id. Then transport_pass_socket tries to
2137set up a continued delivery by passing the socket on to another process. The
2138variable send_rset is FALSE if a message has just been successfully transfered.
2139
2140If we are already sending down a continued channel, there may be further
2141addresses not yet delivered that are aimed at the same host, but which have not
2142been passed in this run of the transport. In this case, continue_more will be
2143true, and all we should do is send RSET if necessary, and return, leaving the
2144channel open.
2145
2146However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2147do not want to continue with other messages down the same channel, because that
2148can lead to looping between two or more messages, all with the same,
2149temporarily failing address(es). [The retry information isn't updated yet, so
2150new processes keep on trying.] We probably also don't want to try more of this
2151message's addresses either.
2152
2153If we have started a TLS session, we have to end it before passing the
2154connection to a new process. However, not all servers can handle this (Exim
2155can), so we do not pass such a connection on if the host matches
2156hosts_nopass_tls. */
2157
2158DEBUG(D_transport)
2159 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2160 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2161 continue_more, yield, (first_addr == NULL)? "":"not ");
2162
2163if (completed_address && ok && send_quit)
2164 {
2165 BOOL more;
2166 if (first_addr != NULL || continue_more ||
2167 (
817d9f57 2168 (tls_out.active < 0 ||
0756eb3c
PH
2169 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2170 host->address, NULL) != OK)
2171 &&
2172 transport_check_waiting(tblock->name, host->name,
2173 tblock->connection_max_messages, new_message_id, &more)
2174 ))
2175 {
2176 uschar *msg;
447d236c 2177 BOOL pass_message;
0756eb3c
PH
2178
2179 if (send_rset)
2180 {
2181 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2182 {
2183 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2184 host->address, strerror(save_errno));
2185 send_quit = FALSE;
2186 }
2187 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2188 ob->command_timeout)))
2189 {
2190 int code;
447d236c
PH
2191 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2192 &pass_message);
0756eb3c
PH
2193 if (!send_quit)
2194 {
2195 DEBUG(D_transport) debug_printf("%s\n", msg);
2196 }
2197 }
2198 }
2199
2200 /* Either RSET was not needed, or it succeeded */
2201
2202 if (ok)
2203 {
2204 if (first_addr != NULL) /* More addresses still to be sent */
2205 { /* in this run of the transport */
2206 continue_sequence++; /* Causes * in logging */
2207 goto SEND_MESSAGE;
2208 }
2209 if (continue_more) return yield; /* More addresses for another run */
2210
2211 /* Pass the socket to a new Exim process. Before doing so, we must shut
2212 down TLS. Not all MTAs allow for the continuation of the SMTP session
2213 when TLS is shut down. We test for this by sending a new EHLO. If we
2214 don't get a good response, we don't attempt to pass the socket on. */
2215
2216 #ifdef SUPPORT_TLS
817d9f57 2217 if (tls_out.active >= 0)
0756eb3c 2218 {
817d9f57 2219 tls_close(FALSE, TRUE);
061b7ebd
PP
2220 if (smtps)
2221 ok = FALSE;
2222 else
2223 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2224 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2225 ob->command_timeout);
0756eb3c
PH
2226 }
2227 #endif
2228
2229 /* If the socket is successfully passed, we musn't send QUIT (or
2230 indeed anything!) from here. */
2231
2232 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2233 new_message_id, inblock.sock))
2234 {
2235 send_quit = FALSE;
2236 }
2237 }
2238
2239 /* If RSET failed and there are addresses left, they get deferred. */
2240
447d236c 2241 else set_errno(first_addr, errno, msg, DEFER, FALSE);
0756eb3c
PH
2242 }
2243 }
2244
2245/* End off tidily with QUIT unless the connection has died or the socket has
2246been passed to another process. There has been discussion on the net about what
2247to do after sending QUIT. The wording of the RFC suggests that it is necessary
2248to wait for a response, but on the other hand, there isn't anything one can do
2249with an error response, other than log it. Exim used to do that. However,
2250further discussion suggested that it is positively advantageous not to wait for
2251the response, but to close the session immediately. This is supposed to move
2252the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2253load from the server. (Hosts that are both servers and clients may not see much
2254difference, of course.) Further discussion indicated that this was safe to do
2255on Unix systems which have decent implementations of TCP/IP that leave the
2256connection around for a while (TIME_WAIT) after the application has gone away.
2257This enables the response sent by the server to be properly ACKed rather than
2258timed out, as can happen on broken TCP/IP implementations on other OS.
2259
2260This change is being made on 31-Jul-98. After over a year of trouble-free
2261operation, the old commented-out code was removed on 17-Sep-99. */
2262
2263SEND_QUIT:
2264if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2265
2266END_OFF:
2267
2268#ifdef SUPPORT_TLS
817d9f57 2269tls_close(FALSE, TRUE);
0756eb3c
PH
2270#endif
2271
2272/* Close the socket, and return the appropriate value, first setting
2273continue_transport and continue_hostname NULL to prevent any other addresses
2274that may include the host from trying to re-use a continuation socket. This
2275works because the NULL setting is passed back to the calling process, and
2276remote_max_parallel is forced to 1 when delivering over an existing connection,
2277
2278If all went well and continue_more is set, we shouldn't actually get here if
2279there are further addresses, as the return above will be taken. However,
2280writing RSET might have failed, or there may be other addresses whose hosts are
2281specified in the transports, and therefore not visible at top level, in which
2282case continue_more won't get set. */
2283
f1e894f3 2284(void)close(inblock.sock);
0756eb3c
PH
2285continue_transport = NULL;
2286continue_hostname = NULL;
2287return yield;
2288}
2289
2290
2291
2292
2293/*************************************************
2294* Closedown entry point *
2295*************************************************/
2296
2297/* This function is called when exim is passed an open smtp channel
2298from another incarnation, but the message which it has been asked
2299to deliver no longer exists. The channel is on stdin.
2300
2301We might do fancy things like looking for another message to send down
2302the channel, but if the one we sought has gone, it has probably been
2303delivered by some other process that itself will seek further messages,
2304so just close down our connection.
2305
2306Argument: pointer to the transport instance block
2307Returns: nothing
2308*/
2309
2310void
2311smtp_transport_closedown(transport_instance *tblock)
2312{
2313smtp_transport_options_block *ob =
2314 (smtp_transport_options_block *)(tblock->options_block);
2315smtp_inblock inblock;
2316smtp_outblock outblock;
2317uschar buffer[256];
2318uschar inbuffer[4096];
2319uschar outbuffer[16];
2320
2321inblock.sock = fileno(stdin);
2322inblock.buffer = inbuffer;
2323inblock.buffersize = sizeof(inbuffer);
2324inblock.ptr = inbuffer;
2325inblock.ptrend = inbuffer;
2326
2327outblock.sock = inblock.sock;
2328outblock.buffersize = sizeof(outbuffer);
2329outblock.buffer = outbuffer;
2330outblock.ptr = outbuffer;
2331outblock.cmd_count = 0;
2332outblock.authenticating = FALSE;
2333
2334(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2335(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2336 ob->command_timeout);
f1e894f3 2337(void)close(inblock.sock);
0756eb3c
PH
2338}
2339
2340
2341
2342/*************************************************
2343* Prepare addresses for delivery *
2344*************************************************/
2345
2346/* This function is called to flush out error settings from previous delivery
2347attempts to other hosts. It also records whether we got here via an MX record
2348or not in the more_errno field of the address. We are interested only in
2349addresses that are still marked DEFER - others may have got delivered to a
2350previously considered IP address. Set their status to PENDING_DEFER to indicate
2351which ones are relevant this time.
2352
2353Arguments:
2354 addrlist the list of addresses
2355 host the host we are delivering to
2356
2357Returns: the first address for this delivery
2358*/
2359
2360static address_item *
2361prepare_addresses(address_item *addrlist, host_item *host)
2362{
2363address_item *first_addr = NULL;
2364address_item *addr;
2365for (addr = addrlist; addr != NULL; addr = addr->next)
2366 {
2367 if (addr->transport_return != DEFER) continue;
2368 if (first_addr == NULL) first_addr = addr;
2369 addr->transport_return = PENDING_DEFER;
2370 addr->basic_errno = 0;
2371 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2372 addr->message = NULL;
2373 #ifdef SUPPORT_TLS
2374 addr->cipher = NULL;
2375 addr->peerdn = NULL;
2376 #endif
2377 }
2378return first_addr;
2379}
2380
2381
2382
2383/*************************************************
2384* Main entry point *
2385*************************************************/
2386
2387/* See local README for interface details. As this is a remote transport, it is
2388given a chain of addresses to be delivered in one connection, if possible. It
2389always returns TRUE, indicating that each address has its own independent
2390status set, except if there is a setting up problem, in which case it returns
2391FALSE. */
2392
2393BOOL
2394smtp_transport_entry(
2395 transport_instance *tblock, /* data for this instantiation */
2396 address_item *addrlist) /* addresses we are working on */
2397{
2398int cutoff_retry;
2399int port;
2400int hosts_defer = 0;
2401int hosts_fail = 0;
2402int hosts_looked_up = 0;
2403int hosts_retry = 0;
2404int hosts_serial = 0;
2405int hosts_total = 0;
8e669ac1 2406int total_hosts_tried = 0;
0756eb3c
PH
2407address_item *addr;
2408BOOL expired = TRUE;
2409BOOL continuing = continue_hostname != NULL;
2410uschar *expanded_hosts = NULL;
2411uschar *pistring;
2412uschar *tid = string_sprintf("%s transport", tblock->name);
2413smtp_transport_options_block *ob =
2414 (smtp_transport_options_block *)(tblock->options_block);
2415host_item *hostlist = addrlist->host_list;
2416host_item *host = NULL;
2417
2418DEBUG(D_transport)
2419 {
2420 debug_printf("%s transport entered\n", tblock->name);
2421 for (addr = addrlist; addr != NULL; addr = addr->next)
2422 debug_printf(" %s\n", addr->address);
2423 if (continuing) debug_printf("already connected to %s [%s]\n",
2424 continue_hostname, continue_host_address);
2425 }
2426
f6c332bd
PH
2427/* Set the flag requesting that these hosts be added to the waiting
2428database if the delivery fails temporarily or if we are running with
2429queue_smtp or a 2-stage queue run. This gets unset for certain
2430kinds of error, typically those that are specific to the message. */
2431
2432update_waiting = TRUE;
2433
0756eb3c
PH
2434/* If a host list is not defined for the addresses - they must all have the
2435same one in order to be passed to a single transport - or if the transport has
2436a host list with hosts_override set, use the host list supplied with the
2437transport. It is an error for this not to exist. */
2438
2439if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2440 {
2441 if (ob->hosts == NULL)
2442 {
2443 addrlist->message = string_sprintf("%s transport called with no hosts set",
2444 tblock->name);
2445 addrlist->transport_return = PANIC;
2446 return FALSE; /* Only top address has status */
2447 }
2448
2449 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2450 ob->hosts);
2451
2452 /* If the transport's host list contains no '$' characters, and we are not
2453 randomizing, it is fixed and therefore a chain of hosts can be built once
2454 and for all, and remembered for subsequent use by other calls to this
2455 transport. If, on the other hand, the host list does contain '$', or we are
2456 randomizing its order, we have to rebuild it each time. In the fixed case,
2457 as the hosts string will never be used again, it doesn't matter that we
2458 replace all the : characters with zeros. */
2459
2460 if (ob->hostlist == NULL)
2461 {
2462 uschar *s = ob->hosts;
2463
2464 if (Ustrchr(s, '$') != NULL)
2465 {
2466 expanded_hosts = expand_string(s);
2467 if (expanded_hosts == NULL)
2468 {
2469 addrlist->message = string_sprintf("failed to expand list of hosts "
2470 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2471 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2472 return FALSE; /* Only top address has status */
2473 }
2474 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2475 "\"%s\"\n", s, expanded_hosts);
2476 s = expanded_hosts;
2477 }
2478 else
2479 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2480
2481 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2482
e276e04b
TF
2483 /* Check that the expansion yielded something useful. */
2484 if (hostlist == NULL)
2485 {
2486 addrlist->message =
2487 string_sprintf("%s transport has empty hosts setting", tblock->name);
2488 addrlist->transport_return = PANIC;
2489 return FALSE; /* Only top address has status */
2490 }
2491
0756eb3c
PH
2492 /* If there was no expansion of hosts, save the host list for
2493 next time. */
2494
2495 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2496 }
2497
2498 /* This is not the first time this transport has been run in this delivery;
2499 the host list was built previously. */
2500
2501 else hostlist = ob->hostlist;
2502 }
2503
2504/* The host list was supplied with the address. If hosts_randomize is set, we
2505must sort it into a random order if it did not come from MX records and has not
2506already been randomized (but don't bother if continuing down an existing
2507connection). */
2508
2509else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2510 {
2511 host_item *newlist = NULL;
2512 while (hostlist != NULL)
2513 {
2514 host_item *h = hostlist;
2515 hostlist = hostlist->next;
2516
2517 h->sort_key = random_number(100);
2518
2519 if (newlist == NULL)
2520 {
2521 h->next = NULL;
2522 newlist = h;
2523 }
2524 else if (h->sort_key < newlist->sort_key)
2525 {
2526 h->next = newlist;
2527 newlist = h;
2528 }
2529 else
2530 {
2531 host_item *hh = newlist;
2532 while (hh->next != NULL)
2533 {
2534 if (h->sort_key < hh->next->sort_key) break;
2535 hh = hh->next;
2536 }
2537 h->next = hh->next;
2538 hh->next = h;
2539 }
2540 }
2541
2542 hostlist = addrlist->host_list = newlist;
2543 }
2544
2545
2d280592 2546/* Sort out the default port. */
0756eb3c
PH
2547
2548if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c
PH
2549
2550
2551/* For each host-plus-IP-address on the list:
2552
2553. If this is a continued delivery and the host isn't the one with the
2554 current connection, skip.
2555
2556. If the status is unusable (i.e. previously failed or retry checked), skip.
2557
2558. If no IP address set, get the address, either by turning the name into
2559 an address, calling gethostbyname if gethostbyname is on, or by calling
2560 the DNS. The DNS may yield multiple addresses, in which case insert the
2561 extra ones into the list.
2562
2563. Get the retry data if not previously obtained for this address and set the
2564 field which remembers the state of this address. Skip if the retry time is
2565 not reached. If not, remember whether retry data was found. The retry string
2566 contains both the name and the IP address.
2567
2568. Scan the list of addresses and mark those whose status is DEFER as
2569 PENDING_DEFER. These are the only ones that will be processed in this cycle
2570 of the hosts loop.
2571
2572. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2573 Some addresses may be successfully delivered, others may fail, and yet
2574 others may get temporary errors and so get marked DEFER.
2575
2576. The return from the delivery attempt is OK if a connection was made and a
2577 valid SMTP dialogue was completed. Otherwise it is DEFER.
2578
2579. If OK, add a "remove" retry item for this host/IPaddress, if any.
2580
2581. If fail to connect, or other defer state, add a retry item.
2582
2583. If there are any addresses whose status is still DEFER, carry on to the
2584 next host/IPaddress, unless we have tried the number of hosts given
533244af 2585 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
2586 there is some fancy logic for hosts_max_try that means its limit can be
2587 overstepped in some circumstances.
0756eb3c
PH
2588
2589If we get to the end of the list, all hosts have deferred at least one address,
2590or not reached their retry times. If delay_after_cutoff is unset, it requests a
2591delivery attempt to those hosts whose last try was before the arrival time of
2592the current message. To cope with this, we have to go round the loop a second
2593time. After that, set the status and error data for any addresses that haven't
2594had it set already. */
2595
2596for (cutoff_retry = 0; expired &&
2597 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2598 cutoff_retry++)
2599 {
2600 host_item *nexthost = NULL;
2601 int unexpired_hosts_tried = 0;
2602
2603 for (host = hostlist;
8e669ac1 2604 host != NULL &&
533244af
PH
2605 unexpired_hosts_tried < ob->hosts_max_try &&
2606 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
2607 host = nexthost)
2608 {
2609 int rc;
2610 int host_af;
2611 uschar *rs;
2612 BOOL serialized = FALSE;
2613 BOOL host_is_expired = FALSE;
2614 BOOL message_defer = FALSE;
2615 BOOL ifchanges = FALSE;
2616 BOOL some_deferred = FALSE;
2617 address_item *first_addr = NULL;
2618 uschar *interface = NULL;
2619 uschar *retry_host_key = NULL;
2620 uschar *retry_message_key = NULL;
2621 uschar *serialize_key = NULL;
2622
9c4e8f60
PH
2623 /* Default next host is next host. :-) But this can vary if the
2624 hosts_max_try limit is hit (see below). It may also be reset if a host
2625 address is looked up here (in case the host was multihomed). */
2626
2627 nexthost = host->next;
2628
0756eb3c
PH
2629 /* If the address hasn't yet been obtained from the host name, look it up
2630 now, unless the host is already marked as unusable. If it is marked as
2631 unusable, it means that the router was unable to find its IP address (in
2632 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2633 the lookup failed last time. We don't get this far if *all* MX records
2634 point to non-existent hosts; that is treated as a hard error.
2635
2636 We can just skip this host entirely. When the hosts came from the router,
2637 the address will timeout based on the other host(s); when the address is
2638 looked up below, there is an explicit retry record added.
2639
2640 Note that we mustn't skip unusable hosts if the address is not unset; they
2641 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2642
2643 if (host->address == NULL)
2644 {
322050c2 2645 int new_port, flags;
7cd1141b 2646 host_item *hh;
0756eb3c
PH
2647 uschar *canonical_name;
2648
2649 if (host->status >= hstatus_unusable)
2650 {
2651 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2652 host->name);
2653 continue;
2654 }
2655
2656 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2657
7cd1141b
PH
2658 /* The host name is permitted to have an attached port. Find it, and
2659 strip it from the name. Just remember it for now. */
2660
2661 new_port = host_item_get_port(host);
2662
2663 /* Count hosts looked up */
2664
0756eb3c
PH
2665 hosts_looked_up++;
2666
2667 /* Find by name if so configured, or if it's an IP address. We don't
2668 just copy the IP address, because we need the test-for-local to happen. */
2669
322050c2
PH
2670 flags = HOST_FIND_BY_A;
2671 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2672 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2673
7e66e54d 2674 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
322050c2 2675 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
0756eb3c 2676 else
0756eb3c
PH
2677 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2678 &canonical_name, NULL);
0756eb3c 2679
7cd1141b
PH
2680 /* Update the host (and any additional blocks, resulting from
2681 multihoming) with a host-specific port, if any. */
2682
2683 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2684
0756eb3c
PH
2685 /* Failure to find the host at this time (usually DNS temporary failure)
2686 is really a kind of routing failure rather than a transport failure.
2687 Therefore we add a retry item of the routing kind, not to stop us trying
2688 to look this name up here again, but to ensure the address gets timed
2689 out if the failures go on long enough. A complete failure at this point
2690 commonly points to a configuration error, but the best action is still
2691 to carry on for the next host. */
2692
2693 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2694 {
2695 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2696 expired = FALSE;
2697 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2698 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2699 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2700 host->status = hstatus_unusable;
2701
2702 for (addr = addrlist; addr != NULL; addr = addr->next)
2703 {
2704 if (addr->transport_return != DEFER) continue;
2705 addr->basic_errno = ERRNO_UNKNOWNHOST;
2706 addr->message =
2707 string_sprintf("failed to lookup IP address for %s", host->name);
2708 }
2709 continue;
2710 }
2711
2712 /* If the host is actually the local host, we may have a problem, or
2713 there may be some cunning configuration going on. In the problem case,
2714 log things and give up. The default transport status is already DEFER. */
2715
2716 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2717 {
2718 for (addr = addrlist; addr != NULL; addr = addr->next)
2719 {
2720 addr->basic_errno = 0;
2721 addr->message = string_sprintf("%s transport found host %s to be "
2722 "local", tblock->name, host->name);
2723 }
2724 goto END_TRANSPORT;
2725 }
2726 } /* End of block for IP address lookup */
2727
2728 /* If this is a continued delivery, we are interested only in the host
2729 which matches the name of the existing open channel. The check is put
2730 here after the local host lookup, in case the name gets expanded as a
2731 result of the lookup. Set expired FALSE, to save the outer loop executing
2732 twice. */
2733
2734 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2735 Ustrcmp(continue_host_address, host->address) != 0))
2736 {
2737 expired = FALSE;
2738 continue; /* With next host */
2739 }
2740
9c4e8f60
PH
2741 /* Reset the default next host in case a multihomed host whose addresses
2742 are not looked up till just above added to the host list. */
83364d30
PH
2743
2744 nexthost = host->next;
2745
0756eb3c
PH
2746 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2747 domain is in queue_smtp_domains, we don't actually want to attempt any
2748 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2749 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2750 were not in it. We don't want to hold up all SMTP deliveries! Except when
2751 doing a two-stage queue run, don't do this if forcing. */
2752
2753 if ((!deliver_force || queue_2stage) && (queue_smtp ||
cf39cf57
PH
2754 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2755 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
2756 {
2757 expired = FALSE;
2758 for (addr = addrlist; addr != NULL; addr = addr->next)
2759 {
2760 if (addr->transport_return != DEFER) continue;
2761 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2762 }
2763 continue; /* With next host */
2764 }
2765
2766 /* Count hosts being considered - purely for an intelligent comment
2767 if none are usable. */
2768
2769 hosts_total++;
2770
2771 /* Set $host and $host address now in case they are needed for the
2772 interface expansion or the serialize_hosts check; they remain set if an
2773 actual delivery happens. */
2774
2775 deliver_host = host->name;
2776 deliver_host_address = host->address;
2777
7cd1141b
PH
2778 /* Set up a string for adding to the retry key if the port number is not
2779 the standard SMTP port. A host may have its own port setting that overrides
2780 the default. */
2781
2782 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2783 port : host->port);
2784 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2785
0756eb3c
PH
2786 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2787 string changes upon expansion, we must add it to the key that is used for
2788 retries, because connections to the same host from a different interface
2789 should be treated separately. */
2790
2791 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2792 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2793 &interface, tid))
2794 return FALSE;
2795 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2796
2797 /* The first time round the outer loop, check the status of the host by
2798 inspecting the retry data. The second time round, we are interested only
2799 in expired hosts that haven't been tried since this message arrived. */
2800
2801 if (cutoff_retry == 0)
2802 {
2803 /* Ensure the status of the address is set by checking retry data if
2804 necessary. There maybe host-specific retry data (applicable to all
2805 messages) and also data for retries of a specific message at this host.
2806 If either of these retry records are actually read, the keys used are
2807 returned to save recomputing them later. */
2808
2809 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2810 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2811
2812 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2813 (host->address == NULL)? US"" : host->address, pistring,
2814 (host->status == hstatus_usable)? "usable" :
2815 (host->status == hstatus_unusable)? "unusable" :
2816 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2817
2818 /* Skip this address if not usable at this time, noting if it wasn't
2819 actually expired, both locally and in the address. */
2820
2821 switch (host->status)
2822 {
2823 case hstatus_unusable:
2824 expired = FALSE;
2825 setflag(addrlist, af_retry_skipped);
2826 /* Fall through */
2827
2828 case hstatus_unusable_expired:
2829 switch (host->why)
2830 {
2831 case hwhy_retry: hosts_retry++; break;
2832 case hwhy_failed: hosts_fail++; break;
2833 case hwhy_deferred: hosts_defer++; break;
2834 }
2835
2836 /* If there was a retry message key, implying that previously there
2837 was a message-specific defer, we don't want to update the list of
f6c332bd 2838 messages waiting for these hosts. */
0756eb3c 2839
f6c332bd 2840 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
2841 continue; /* With the next host or IP address */
2842 }
2843 }
2844
2845 /* Second time round the loop: if the address is set but expired, and
2846 the message is newer than the last try, let it through. */
2847
2848 else
2849 {
2850 if (host->address == NULL ||
2851 host->status != hstatus_unusable_expired ||
2852 host->last_try > received_time)
2853 continue;
2854 DEBUG(D_transport)
2855 debug_printf("trying expired host %s [%s]%s\n",
2856 host->name, host->address, pistring);
2857 host_is_expired = TRUE;
2858 }
2859
2860 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2861 it remains TRUE only if all hosts are expired and none are actually tried.
2862 */
2863
2864 expired = FALSE;
2865
2866 /* If this host is listed as one to which access must be serialized,
2867 see if another Exim process has a connection to it, and if so, skip
2868 this host. If not, update the database to record our connection to it
2869 and remember this for later deletion. Do not do any of this if we are
2870 sending the message down a pre-existing connection. */
2871
2872 if (!continuing &&
2873 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2874 host->address, NULL) == OK)
2875 {
2876 serialize_key = string_sprintf("host-serialize-%s", host->name);
2877 if (!enq_start(serialize_key))
2878 {
2879 DEBUG(D_transport)
2880 debug_printf("skipping host %s because another Exim process "
2881 "is connected to it\n", host->name);
2882 hosts_serial++;
2883 continue;
2884 }
2885 serialized = TRUE;
2886 }
2887
2888 /* OK, we have an IP address that is not waiting for its retry time to
2889 arrive (it might be expired) OR (second time round the loop) we have an
2890 expired host that hasn't been tried since the message arrived. Have a go
2891 at delivering the message to it. First prepare the addresses by flushing
2892 out the result of previous attempts, and finding the first address that
2893 is still to be delivered. */
2894
2895 first_addr = prepare_addresses(addrlist, host);
2896
2897 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2898 message_id, host->name, host->address, addrlist->address,
2899 (addrlist->next == NULL)? "" : ", ...");
2900
2901 set_process_info("delivering %s to %s [%s] (%s%s)",
2902 message_id, host->name, host->address, addrlist->address,
2903 (addrlist->next == NULL)? "" : ", ...");
2904
2905 /* This is not for real; don't do the delivery. If there are
2906 any remaining hosts, list them. */
2907
2908 if (dont_deliver)
2909 {
2910 host_item *host2;
447d236c 2911 set_errno(addrlist, 0, NULL, OK, FALSE);
0756eb3c
PH
2912 for (addr = addrlist; addr != NULL; addr = addr->next)
2913 {
2914 addr->host_used = host;
2915 addr->special_action = '*';
2916 addr->message = US"delivery bypassed by -N option";
2917 }
2918 DEBUG(D_transport)
2919 {
2920 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2921 "*** host and remaining hosts:\n", tblock->name);
2922 for (host2 = host; host2 != NULL; host2 = host2->next)
2923 debug_printf(" %s [%s]\n", host2->name,
2924 (host2->address == NULL)? US"unset" : host2->address);
2925 }
2926 rc = OK;
2927 }
2928
2929 /* This is for real. If the host is expired, we don't count it for
2930 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 2931 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 2932 lunatic DNS configurations) is reached.
8e669ac1 2933
533244af
PH
2934 If the host is not expired and we are about to hit the hosts_max_retry
2935 limit, check to see if there is a subsequent hosts with a different MX
2936 value. If so, make that the next host, and don't count this one. This is a
2937 heuristic to make sure that different MXs do get tried. With a normal kind
2938 of retry rule, they would get tried anyway when the earlier hosts were
2939 delayed, but if the domain has a "retry every time" type of rule - as is
2940 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH
2941
2942 else
2943 {
2944 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
2945 {
2946 host_item *h;
2947 DEBUG(D_transport)
2948 debug_printf("hosts_max_try limit reached with this host\n");
2949 for (h = host; h != NULL; h = h->next)
2950 if (h->mx != host->mx) break;
2951 if (h != NULL)
2952 {
2953 nexthost = h;
2954 unexpired_hosts_tried--;
2955 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
2956 "and will be tried\n");
2957 }
2958 }
2959
2960 /* Attempt the delivery. */
2961
533244af 2962 total_hosts_tried++;
0756eb3c
PH
2963 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
2964 expanded_hosts != NULL, &message_defer, FALSE);
2965
2966 /* Yield is one of:
2967 OK => connection made, each address contains its result;
2968 message_defer is set for message-specific defers (when all
2969 recipients are marked defer)
2970 DEFER => there was a non-message-specific delivery problem;
2971 ERROR => there was a problem setting up the arguments for a filter,
2972 or there was a problem with expanding added headers
2973 */
2974
2975 /* If the result is not OK, there was a non-message-specific problem.
2976 If the result is DEFER, we need to write to the logs saying what happened
2977 for this particular host, except in the case of authentication and TLS
2978 failures, where the log has already been written. If all hosts defer a
2979 general message is written at the end. */
2980
2981 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
2982 first_addr->basic_errno != ERRNO_TLSFAILURE)
2983 write_logs(first_addr, host);
2984
2985 /* If STARTTLS was accepted, but there was a failure in setting up the
2986 TLS session (usually a certificate screwup), and the host is not in
2987 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
2988 TLS forcibly turned off. We have to start from scratch with a new SMTP
2989 connection. That's why the retry is done from here, not from within
2990 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
2991 session, so the in-clear transmission after those errors, if permitted,
2992 happens inside smtp_deliver().] */
2993
2994 #ifdef SUPPORT_TLS
2995 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
2996 ob->tls_tempfail_tryclear &&
2997 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
2998 host->address, NULL) != OK)
2999 {
3000 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3001 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3002 first_addr = prepare_addresses(addrlist, host);
3003 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3004 expanded_hosts != NULL, &message_defer, TRUE);
3005 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3006 write_logs(first_addr, host);
3007 }
3008 #endif
3009 }
3010
3011 /* Delivery attempt finished */
3012
3013 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3014 US"ERROR" : US"?";
3015
3016 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3017 message_id, host->name, host->address, addrlist->address,
3018 (addrlist->next == NULL)? "" : " (& others)", rs);
3019
3020 /* Release serialization if set up */
3021
3022 if (serialized) enq_end(serialize_key);
3023
3024 /* If the result is DEFER, or if a host retry record is known to exist, we
3025 need to add an item to the retry chain for updating the retry database
3026 at the end of delivery. We only need to add the item to the top address,
3027 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3028 for any other delivery attempts using the same address. (It is copied into
3029 the unusable tree at the outer level, so even if different address blocks
3030 contain the same address, it still won't get tried again.) */
3031
3032 if (rc == DEFER || retry_host_key != NULL)
3033 {
3034 int delete_flag = (rc != DEFER)? rf_delete : 0;
3035 if (retry_host_key == NULL)
3036 {
3037 retry_host_key = ob->retry_include_ip_address?
3038 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3039 string_sprintf("T:%S%s", host->name, pistring);
3040 }
3041
3042 /* If a delivery of another message over an existing SMTP connection
3043 yields DEFER, we do NOT set up retry data for the host. This covers the
3044 case when there are delays in routing the addresses in the second message
3045 that are so long that the server times out. This is alleviated by not
3046 routing addresses that previously had routing defers when handling an
3047 existing connection, but even so, this case may occur (e.g. if a
3048 previously happily routed address starts giving routing defers). If the
3049 host is genuinely down, another non-continued message delivery will
3050 notice it soon enough. */
3051
3052 if (delete_flag != 0 || !continuing)
3053 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3054
3055 /* We may have tried an expired host, if its retry time has come; ensure
3056 the status reflects the expiry for the benefit of any other addresses. */
3057
3058 if (rc == DEFER)
3059 {
3060 host->status = (host_is_expired)?
3061 hstatus_unusable_expired : hstatus_unusable;
3062 host->why = hwhy_deferred;
3063 }
3064 }
3065
3066 /* If message_defer is set (host was OK, but every recipient got deferred
3067 because of some message-specific problem), or if that had happened
3068 previously so that a message retry key exists, add an appropriate item
3069 to the retry chain. Note that if there was a message defer but now there is
3070 a host defer, the message defer record gets deleted. That seems perfectly
3071 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3072 for specific hosts. */
0756eb3c
PH
3073
3074 if (message_defer || retry_message_key != NULL)
3075 {
3076 int delete_flag = message_defer? 0 : rf_delete;
3077 if (retry_message_key == NULL)
3078 {
3079 retry_message_key = ob->retry_include_ip_address?
3080 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3081 message_id) :
3082 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3083 }
3084 retry_add_item(addrlist, retry_message_key,
3085 rf_message | rf_host | delete_flag);
f6c332bd 3086 update_waiting = FALSE;
0756eb3c
PH
3087 }
3088
3089 /* Any return other than DEFER (that is, OK or ERROR) means that the
3090 addresses have got their final statuses filled in for this host. In the OK
3091 case, see if any of them are deferred. */
3092
3093 if (rc == OK)
3094 {
3095 for (addr = addrlist; addr != NULL; addr = addr->next)
3096 {
3097 if (addr->transport_return == DEFER)
3098 {
3099 some_deferred = TRUE;
3100 break;
3101 }
3102 }
3103 }
3104
3105 /* If no addresses deferred or the result was ERROR, return. We do this for
3106 ERROR because a failing filter set-up or add_headers expansion is likely to
3107 fail for any host we try. */
3108
3109 if (rc == ERROR || (rc == OK && !some_deferred))
3110 {
3111 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3112 return TRUE; /* Each address has its status */
3113 }
3114
3115 /* If the result was DEFER or some individual addresses deferred, let
3116 the loop run to try other hosts with the deferred addresses, except for the
3117 case when we were trying to deliver down an existing channel and failed.
3118 Don't try any other hosts in this case. */
3119
3120 if (continuing) break;
3121
3122 /* If the whole delivery, or some individual addresses, were deferred and
3123 there are more hosts that could be tried, do not count this host towards
3124 the hosts_max_try limit if the age of the message is greater than the
3125 maximum retry time for this host. This means we may try try all hosts,
3126 ignoring the limit, when messages have been around for some time. This is
3127 important because if we don't try all hosts, the address will never time
533244af 3128 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
0756eb3c
PH
3129
3130 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3131 {
3132 BOOL timedout;
3133 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3134
3135 if (retry != NULL && retry->rules != NULL)
3136 {
3137 retry_rule *last_rule;
3138 for (last_rule = retry->rules;
3139 last_rule->next != NULL;
3140 last_rule = last_rule->next);
3141 timedout = time(NULL) - received_time > last_rule->timeout;
3142 }
3143 else timedout = TRUE; /* No rule => timed out */
3144
3145 if (timedout)
3146 {
3147 unexpired_hosts_tried--;
3148 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3149 "hosts_max_try (message older than host's retry time)\n");
3150 }
3151 }
3152 } /* End of loop for trying multiple hosts. */
3153
3154 /* This is the end of the loop that repeats iff expired is TRUE and
3155 ob->delay_after_cutoff is FALSE. The second time round we will
3156 try those hosts that haven't been tried since the message arrived. */
3157
3158 DEBUG(D_transport)
3159 {
3160 debug_printf("all IP addresses skipped or deferred at least one address\n");
3161 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3162 debug_printf("retrying IP addresses not tried since message arrived\n");
3163 }
3164 }
3165
3166
3167/* Get here if all IP addresses are skipped or defer at least one address. In
3168MUA wrapper mode, this will happen only for connection or other non-message-
3169specific failures. Force the delivery status for all addresses to FAIL. */
3170
3171if (mua_wrapper)
3172 {
3173 for (addr = addrlist; addr != NULL; addr = addr->next)
3174 addr->transport_return = FAIL;
3175 goto END_TRANSPORT;
3176 }
3177
3178/* In the normal, non-wrapper case, add a standard message to each deferred
3179address if there hasn't been an error, that is, if it hasn't actually been
3180tried this time. The variable "expired" will be FALSE if any deliveries were
3181actually tried, or if there was at least one host that was not expired. That
3182is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3183a delivery has been tried, an error code will be set, and the failing of the
3184message is handled by the retry code later.
3185
3186If queue_smtp is set, or this transport was called to send a subsequent message
3187down an existing TCP/IP connection, and something caused the host not to be
3188found, we end up here, but can detect these cases and handle them specially. */
3189
3190for (addr = addrlist; addr != NULL; addr = addr->next)
3191 {
3192 /* If host is not NULL, it means that we stopped processing the host list
533244af
PH
3193 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3194 means we need to behave as if some hosts were skipped because their retry
3195 time had not come. Specifically, this prevents the address from timing out.
8e669ac1 3196 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
533244af 3197 hosts were tried. */
0756eb3c
PH
3198
3199 if (host != NULL)
3200 {
533244af
PH
3201 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3202 {
3203 DEBUG(D_transport)
3204 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3205 "hosts were tried\n");
3206 }
3207 else
8e669ac1 3208 {
533244af
PH
3209 DEBUG(D_transport)
3210 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3211 setflag(addr, af_retry_skipped);
8e669ac1 3212 }
0756eb3c
PH
3213 }
3214
3215 if (queue_smtp) /* no deliveries attempted */
3216 {
3217 addr->transport_return = DEFER;
3218 addr->basic_errno = 0;
3219 addr->message = US"SMTP delivery explicitly queued";
3220 }
3221
3222 else if (addr->transport_return == DEFER &&
3223 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3224 addr->message == NULL)
3225 {
3226 addr->basic_errno = ERRNO_HRETRY;
3227 if (continue_hostname != NULL)
3228 {
3229 addr->message = US"no host found for existing SMTP connection";
3230 }
3231 else if (expired)
3232 {
fffffe4c 3233 setflag(addr, af_pass_message); /* This is not a security risk */
0756eb3c
PH
3234 addr->message = (ob->delay_after_cutoff)?
3235 US"retry time not reached for any host after a long failure period" :
3236 US"all hosts have been failing for a long time and were last tried "
3237 "after this message arrived";
3238
3239 /* If we are already using fallback hosts, or there are no fallback hosts
3240 defined, convert the result to FAIL to cause a bounce. */
3241
3242 if (addr->host_list == addr->fallback_hosts ||
3243 addr->fallback_hosts == NULL)
3244 addr->transport_return = FAIL;
3245 }
3246 else
3247 {
3248 if (hosts_retry == hosts_total)
3249 addr->message = US"retry time not reached for any host";
3250 else if (hosts_fail == hosts_total)
3251 addr->message = US"all host address lookups failed permanently";
3252 else if (hosts_defer == hosts_total)
3253 addr->message = US"all host address lookups failed temporarily";
3254 else if (hosts_serial == hosts_total)
3255 addr->message = US"connection limit reached for all hosts";
3256 else if (hosts_fail+hosts_defer == hosts_total)
3257 addr->message = US"all host address lookups failed";
3258 else addr->message = US"some host address lookups failed and retry time "
3259 "not reached for other hosts or connection limit reached";
3260 }
3261 }
3262 }
3263
3264/* Update the database which keeps information about which messages are waiting
f6c332bd
PH
3265for which hosts to become available. For some message-specific errors, the
3266update_waiting flag is turned off because we don't want follow-on deliveries in
ea722490 3267those cases. If this transport instance is explicitly limited to one message
8b260705
PP
3268per connection then follow-on deliveries are not possible and there's no need
3269to create/update the per-transport wait-<transport_name> database. */
0756eb3c 3270
ea722490
JH
3271if (update_waiting && tblock->connection_max_messages != 1)
3272 transport_update_waiting(hostlist, tblock->name);
0756eb3c
PH
3273
3274END_TRANSPORT:
3275
3276DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3277
3278return TRUE; /* Each address has its status */
3279}
3280
3281/* End of transport/smtp.c */