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