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