1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
11 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options
[] = {
22 { "*expand_multi_domain", opt_stringptr
| opt_hidden
| opt_public
,
23 (void *)offsetof(transport_instance
, expand_multi_domain
) },
24 { "*expand_retry_include_ip_address", opt_stringptr
| opt_hidden
,
25 (void *)(offsetof(smtp_transport_options_block
, expand_retry_include_ip_address
)) },
27 { "address_retry_include_sender", opt_bool
,
28 (void *)offsetof(smtp_transport_options_block
, address_retry_include_sender
) },
29 { "allow_localhost", opt_bool
,
30 (void *)offsetof(smtp_transport_options_block
, allow_localhost
) },
31 #ifdef EXPERIMENTAL_ARC
32 { "arc_sign", opt_stringptr
,
33 (void *)offsetof(smtp_transport_options_block
, arc_sign
) },
35 { "authenticated_sender", opt_stringptr
,
36 (void *)offsetof(smtp_transport_options_block
, authenticated_sender
) },
37 { "authenticated_sender_force", opt_bool
,
38 (void *)offsetof(smtp_transport_options_block
, authenticated_sender_force
) },
39 { "command_timeout", opt_time
,
40 (void *)offsetof(smtp_transport_options_block
, command_timeout
) },
41 { "connect_timeout", opt_time
,
42 (void *)offsetof(smtp_transport_options_block
, connect_timeout
) },
43 { "connection_max_messages", opt_int
| opt_public
,
44 (void *)offsetof(transport_instance
, connection_max_messages
) },
46 { "dane_require_tls_ciphers", opt_stringptr
,
47 (void *)offsetof(smtp_transport_options_block
, dane_require_tls_ciphers
) },
49 { "data_timeout", opt_time
,
50 (void *)offsetof(smtp_transport_options_block
, data_timeout
) },
51 { "delay_after_cutoff", opt_bool
,
52 (void *)offsetof(smtp_transport_options_block
, delay_after_cutoff
) },
54 { "dkim_canon", opt_stringptr
,
55 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_canon
) },
56 { "dkim_domain", opt_stringptr
,
57 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_domain
) },
58 { "dkim_hash", opt_stringptr
,
59 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_hash
) },
60 { "dkim_identity", opt_stringptr
,
61 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_identity
) },
62 { "dkim_private_key", opt_stringptr
,
63 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_private_key
) },
64 { "dkim_selector", opt_stringptr
,
65 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_selector
) },
66 { "dkim_sign_headers", opt_stringptr
,
67 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_sign_headers
) },
68 { "dkim_strict", opt_stringptr
,
69 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_strict
) },
70 { "dkim_timestamps", opt_stringptr
,
71 (void *)offsetof(smtp_transport_options_block
, dkim
.dkim_timestamps
) },
73 { "dns_qualify_single", opt_bool
,
74 (void *)offsetof(smtp_transport_options_block
, dns_qualify_single
) },
75 { "dns_search_parents", opt_bool
,
76 (void *)offsetof(smtp_transport_options_block
, dns_search_parents
) },
77 { "dnssec_request_domains", opt_stringptr
,
78 (void *)offsetof(smtp_transport_options_block
, dnssec
.request
) },
79 { "dnssec_require_domains", opt_stringptr
,
80 (void *)offsetof(smtp_transport_options_block
, dnssec
.require
) },
81 { "dscp", opt_stringptr
,
82 (void *)offsetof(smtp_transport_options_block
, dscp
) },
83 { "fallback_hosts", opt_stringptr
,
84 (void *)offsetof(smtp_transport_options_block
, fallback_hosts
) },
85 { "final_timeout", opt_time
,
86 (void *)offsetof(smtp_transport_options_block
, final_timeout
) },
87 { "gethostbyname", opt_bool
,
88 (void *)offsetof(smtp_transport_options_block
, gethostbyname
) },
89 { "helo_data", opt_stringptr
,
90 (void *)offsetof(smtp_transport_options_block
, helo_data
) },
91 { "hosts", opt_stringptr
,
92 (void *)offsetof(smtp_transport_options_block
, hosts
) },
93 { "hosts_avoid_esmtp", opt_stringptr
,
94 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_esmtp
) },
95 { "hosts_avoid_pipelining", opt_stringptr
,
96 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_pipelining
) },
98 { "hosts_avoid_tls", opt_stringptr
,
99 (void *)offsetof(smtp_transport_options_block
, hosts_avoid_tls
) },
101 { "hosts_max_try", opt_int
,
102 (void *)offsetof(smtp_transport_options_block
, hosts_max_try
) },
103 { "hosts_max_try_hardlimit", opt_int
,
104 (void *)offsetof(smtp_transport_options_block
, hosts_max_try_hardlimit
) },
106 { "hosts_nopass_tls", opt_stringptr
,
107 (void *)offsetof(smtp_transport_options_block
, hosts_nopass_tls
) },
108 { "hosts_noproxy_tls", opt_stringptr
,
109 (void *)offsetof(smtp_transport_options_block
, hosts_noproxy_tls
) },
111 { "hosts_override", opt_bool
,
112 (void *)offsetof(smtp_transport_options_block
, hosts_override
) },
113 #ifdef SUPPORT_PIPE_CONNECT
114 { "hosts_pipe_connect", opt_stringptr
,
115 (void *)offsetof(smtp_transport_options_block
, hosts_pipe_connect
) },
117 { "hosts_randomize", opt_bool
,
118 (void *)offsetof(smtp_transport_options_block
, hosts_randomize
) },
119 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
120 { "hosts_request_ocsp", opt_stringptr
,
121 (void *)offsetof(smtp_transport_options_block
, hosts_request_ocsp
) },
123 { "hosts_require_auth", opt_stringptr
,
124 (void *)offsetof(smtp_transport_options_block
, hosts_require_auth
) },
127 { "hosts_require_dane", opt_stringptr
,
128 (void *)offsetof(smtp_transport_options_block
, hosts_require_dane
) },
130 # ifndef DISABLE_OCSP
131 { "hosts_require_ocsp", opt_stringptr
,
132 (void *)offsetof(smtp_transport_options_block
, hosts_require_ocsp
) },
134 { "hosts_require_tls", opt_stringptr
,
135 (void *)offsetof(smtp_transport_options_block
, hosts_require_tls
) },
137 { "hosts_try_auth", opt_stringptr
,
138 (void *)offsetof(smtp_transport_options_block
, hosts_try_auth
) },
139 { "hosts_try_chunking", opt_stringptr
,
140 (void *)offsetof(smtp_transport_options_block
, hosts_try_chunking
) },
142 { "hosts_try_dane", opt_stringptr
,
143 (void *)offsetof(smtp_transport_options_block
, hosts_try_dane
) },
145 { "hosts_try_fastopen", opt_stringptr
,
146 (void *)offsetof(smtp_transport_options_block
, hosts_try_fastopen
) },
148 { "hosts_try_prdr", opt_stringptr
,
149 (void *)offsetof(smtp_transport_options_block
, hosts_try_prdr
) },
152 { "hosts_verify_avoid_tls", opt_stringptr
,
153 (void *)offsetof(smtp_transport_options_block
, hosts_verify_avoid_tls
) },
155 { "interface", opt_stringptr
,
156 (void *)offsetof(smtp_transport_options_block
, interface
) },
157 { "keepalive", opt_bool
,
158 (void *)offsetof(smtp_transport_options_block
, keepalive
) },
159 { "lmtp_ignore_quota", opt_bool
,
160 (void *)offsetof(smtp_transport_options_block
, lmtp_ignore_quota
) },
161 { "max_rcpt", opt_int
| opt_public
,
162 (void *)offsetof(transport_instance
, max_addresses
) },
163 { "multi_domain", opt_expand_bool
| opt_public
,
164 (void *)offsetof(transport_instance
, multi_domain
) },
165 { "port", opt_stringptr
,
166 (void *)offsetof(smtp_transport_options_block
, port
) },
167 { "protocol", opt_stringptr
,
168 (void *)offsetof(smtp_transport_options_block
, protocol
) },
169 { "retry_include_ip_address", opt_expand_bool
,
170 (void *)offsetof(smtp_transport_options_block
, retry_include_ip_address
) },
171 { "serialize_hosts", opt_stringptr
,
172 (void *)offsetof(smtp_transport_options_block
, serialize_hosts
) },
173 { "size_addition", opt_int
,
174 (void *)offsetof(smtp_transport_options_block
, size_addition
) },
176 { "socks_proxy", opt_stringptr
,
177 (void *)offsetof(smtp_transport_options_block
, socks_proxy
) },
180 { "tls_certificate", opt_stringptr
,
181 (void *)offsetof(smtp_transport_options_block
, tls_certificate
) },
182 { "tls_crl", opt_stringptr
,
183 (void *)offsetof(smtp_transport_options_block
, tls_crl
) },
184 { "tls_dh_min_bits", opt_int
,
185 (void *)offsetof(smtp_transport_options_block
, tls_dh_min_bits
) },
186 { "tls_privatekey", opt_stringptr
,
187 (void *)offsetof(smtp_transport_options_block
, tls_privatekey
) },
188 { "tls_require_ciphers", opt_stringptr
,
189 (void *)offsetof(smtp_transport_options_block
, tls_require_ciphers
) },
190 # ifdef EXPERIMENTAL_TLS_RESUME
191 { "tls_resumption_hosts", opt_stringptr
,
192 (void *)offsetof(smtp_transport_options_block
, tls_resumption_hosts
) },
194 { "tls_sni", opt_stringptr
,
195 (void *)offsetof(smtp_transport_options_block
, tls_sni
) },
196 { "tls_tempfail_tryclear", opt_bool
,
197 (void *)offsetof(smtp_transport_options_block
, tls_tempfail_tryclear
) },
198 { "tls_try_verify_hosts", opt_stringptr
,
199 (void *)offsetof(smtp_transport_options_block
, tls_try_verify_hosts
) },
200 { "tls_verify_cert_hostnames", opt_stringptr
,
201 (void *)offsetof(smtp_transport_options_block
,tls_verify_cert_hostnames
)},
202 { "tls_verify_certificates", opt_stringptr
,
203 (void *)offsetof(smtp_transport_options_block
, tls_verify_certificates
) },
204 { "tls_verify_hosts", opt_stringptr
,
205 (void *)offsetof(smtp_transport_options_block
, tls_verify_hosts
) },
208 { "utf8_downconvert", opt_stringptr
,
209 (void *)offsetof(smtp_transport_options_block
, utf8_downconvert
) },
213 /* Size of the options list. An extern variable has to be used so that its
214 address can appear in the tables drtables.c. */
216 int smtp_transport_options_count
= nelem(smtp_transport_options
);
222 smtp_transport_options_block smtp_transport_option_defaults
= {0};
223 void smtp_transport_init(transport_instance
*tblock
) {}
224 BOOL
smtp_transport_entry(transport_instance
*tblock
, address_item
*addr
) {return FALSE
;}
225 void smtp_transport_closedown(transport_instance
*tblock
) {}
227 #else /*!MACRO_PREDEF*/
230 /* Default private options block for the smtp transport. */
232 smtp_transport_options_block smtp_transport_option_defaults
= {
234 .fallback_hosts
= NULL
,
236 .fallback_hostlist
= NULL
,
237 .helo_data
= US
"$primary_hostname",
240 .protocol
= US
"smtp",
242 .serialize_hosts
= NULL
,
243 .hosts_try_auth
= NULL
,
244 .hosts_require_auth
= NULL
,
245 .hosts_try_chunking
= US
"*",
247 .hosts_try_dane
= US
"*",
248 .hosts_require_dane
= NULL
,
249 .dane_require_tls_ciphers
= NULL
,
251 .hosts_try_fastopen
= US
"*",
253 .hosts_try_prdr
= US
"*",
256 .hosts_request_ocsp
= US
"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
257 .hosts_require_ocsp
= NULL
,
259 .hosts_require_tls
= NULL
,
260 .hosts_avoid_tls
= NULL
,
261 .hosts_verify_avoid_tls
= NULL
,
262 .hosts_avoid_pipelining
= NULL
,
263 #ifdef SUPPORT_PIPE_CONNECT
264 .hosts_pipe_connect
= NULL
,
266 .hosts_avoid_esmtp
= NULL
,
268 .hosts_nopass_tls
= NULL
,
269 .hosts_noproxy_tls
= NULL
,
271 .command_timeout
= 5*60,
272 .connect_timeout
= 5*60,
273 .data_timeout
= 5*60,
274 .final_timeout
= 10*60,
275 .size_addition
= 1024,
277 .hosts_max_try_hardlimit
= 50,
278 .address_retry_include_sender
= TRUE
,
279 .allow_localhost
= FALSE
,
280 .authenticated_sender_force
= FALSE
,
281 .gethostbyname
= FALSE
,
282 .dns_qualify_single
= TRUE
,
283 .dns_search_parents
= FALSE
,
284 .dnssec
= { .request
= US
"*", .require
=NULL
},
285 .delay_after_cutoff
= TRUE
,
286 .hosts_override
= FALSE
,
287 .hosts_randomize
= FALSE
,
289 .lmtp_ignore_quota
= FALSE
,
290 .expand_retry_include_ip_address
= NULL
,
291 .retry_include_ip_address
= TRUE
,
296 .tls_certificate
= NULL
,
298 .tls_privatekey
= NULL
,
299 .tls_require_ciphers
= NULL
,
301 .tls_verify_certificates
= US
"system",
302 .tls_dh_min_bits
= EXIM_CLIENT_DH_DEFAULT_MIN_BITS
,
303 .tls_tempfail_tryclear
= TRUE
,
304 # ifdef EXPERIMENTAL_TLS_RESUME
305 .tls_resumption_hosts
= NULL
,
307 .tls_verify_hosts
= NULL
,
308 .tls_try_verify_hosts
= US
"*",
309 .tls_verify_cert_hostnames
= US
"*",
312 .utf8_downconvert
= NULL
,
316 {.dkim_domain
= NULL
,
317 .dkim_identity
= NULL
,
318 .dkim_private_key
= NULL
,
319 .dkim_selector
= NULL
,
321 .dkim_sign_headers
= NULL
,
323 .dkim_hash
= US
"sha256",
324 .dkim_timestamps
= NULL
,
325 .dot_stuffed
= FALSE
,
326 .force_bodyhash
= FALSE
,
327 # ifdef EXPERIMENTAL_ARC
328 .arc_signspec
= NULL
,
331 # ifdef EXPERIMENTAL_ARC
337 /* some DSN flags for use later */
339 static int rf_list
[] = {rf_notify_never
, rf_notify_success
,
340 rf_notify_failure
, rf_notify_delay
};
342 static uschar
*rf_names
[] = { US
"NEVER", US
"SUCCESS", US
"FAILURE", US
"DELAY" };
348 static uschar
*smtp_command
; /* Points to last cmd for error messages */
349 static uschar
*mail_command
; /* Points to MAIL cmd for error messages */
350 static uschar
*data_command
= US
""; /* Points to DATA cmd for error messages */
351 static BOOL update_waiting
; /* TRUE to update the "wait" database */
353 /*XXX move to smtp_context */
354 static BOOL pipelining_active
; /* current transaction is in pipe mode */
357 static unsigned ehlo_response(uschar
* buf
, unsigned checks
);
360 /*************************************************
361 * Setup entry point *
362 *************************************************/
364 /* This function is called when the transport is about to be used,
365 but before running it in a sub-process. It is used for two things:
367 (1) To set the fallback host list in addresses, when delivering.
368 (2) To pass back the interface, port, protocol, and other options, for use
369 during callout verification.
372 tblock pointer to the transport instance block
373 addrlist list of addresses about to be transported
374 tf if not NULL, pointer to block in which to return options
375 uid the uid that will be set (not used)
376 gid the gid that will be set (not used)
377 errmsg place for error message (not used)
379 Returns: OK always (FAIL, DEFER not used)
383 smtp_transport_setup(transport_instance
*tblock
, address_item
*addrlist
,
384 transport_feedback
*tf
, uid_t uid
, gid_t gid
, uschar
**errmsg
)
386 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
388 errmsg
= errmsg
; /* Keep picky compilers happy */
392 /* Pass back options if required. This interface is getting very messy. */
396 tf
->interface
= ob
->interface
;
398 tf
->protocol
= ob
->protocol
;
399 tf
->hosts
= ob
->hosts
;
400 tf
->hosts_override
= ob
->hosts_override
;
401 tf
->hosts_randomize
= ob
->hosts_randomize
;
402 tf
->gethostbyname
= ob
->gethostbyname
;
403 tf
->qualify_single
= ob
->dns_qualify_single
;
404 tf
->search_parents
= ob
->dns_search_parents
;
405 tf
->helo_data
= ob
->helo_data
;
408 /* Set the fallback host list for all the addresses that don't have fallback
409 host lists, provided that the local host wasn't present in the original host
412 if (!testflag(addrlist
, af_local_host_removed
))
413 for (; addrlist
; addrlist
= addrlist
->next
)
414 if (!addrlist
->fallback_hosts
) addrlist
->fallback_hosts
= ob
->fallback_hostlist
;
421 /*************************************************
422 * Initialization entry point *
423 *************************************************/
425 /* Called for each instance, after its options have been read, to
426 enable consistency checks to be done, or anything else that needs
429 Argument: pointer to the transport instance block
434 smtp_transport_init(transport_instance
*tblock
)
436 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
438 /* Retry_use_local_part defaults FALSE if unset */
440 if (tblock
->retry_use_local_part
== TRUE_UNSET
)
441 tblock
->retry_use_local_part
= FALSE
;
443 /* Set the default port according to the protocol */
446 ob
->port
= strcmpic(ob
->protocol
, US
"lmtp") == 0
448 : strcmpic(ob
->protocol
, US
"smtps") == 0
449 ? US
"smtps" : US
"smtp";
451 /* Set up the setup entry point, to be called before subprocesses for this
454 tblock
->setup
= smtp_transport_setup
;
456 /* Complain if any of the timeouts are zero. */
458 if (ob
->command_timeout
<= 0 || ob
->data_timeout
<= 0 ||
459 ob
->final_timeout
<= 0)
460 log_write(0, LOG_PANIC_DIE
|LOG_CONFIG
,
461 "command, data, or final timeout value is zero for %s transport",
464 /* If hosts_override is set and there are local hosts, set the global
465 flag that stops verify from showing router hosts. */
467 if (ob
->hosts_override
&& ob
->hosts
!= NULL
) tblock
->overrides_hosts
= TRUE
;
469 /* If there are any fallback hosts listed, build a chain of host items
470 for them, but do not do any lookups at this time. */
472 host_build_hostlist(&(ob
->fallback_hostlist
), ob
->fallback_hosts
, FALSE
);
479 /*************************************************
480 * Set delivery info into all active addresses *
481 *************************************************/
483 /* Only addresses whose status is >= PENDING are relevant. A lesser
484 status means that an address is not currently being processed.
487 addrlist points to a chain of addresses
488 errno_value to put in each address's errno field
489 msg to put in each address's message field
490 rc to put in each address's transport_return field
491 pass_message if TRUE, set the "pass message" flag in the address
492 host if set, mark addrs as having used this host
493 smtp_greeting from peer
494 helo_response from peer
496 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
497 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
498 this particular type of timeout.
504 set_errno(address_item
*addrlist
, int errno_value
, uschar
*msg
, int rc
,
505 BOOL pass_message
, host_item
* host
506 #ifdef EXPERIMENTAL_DSN_INFO
507 , const uschar
* smtp_greeting
, const uschar
* helo_response
512 if (errno_value
== ERRNO_CONNECTTIMEOUT
)
514 errno_value
= ETIMEDOUT
;
515 orvalue
= RTEF_CTOUT
;
517 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
518 if (addr
->transport_return
>= PENDING
)
520 addr
->basic_errno
= errno_value
;
521 addr
->more_errno
|= orvalue
;
525 if (pass_message
) setflag(addr
, af_pass_message
);
527 addr
->transport_return
= rc
;
530 addr
->host_used
= host
;
531 #ifdef EXPERIMENTAL_DSN_INFO
533 {uschar
* s
= Ustrchr(smtp_greeting
, '\n'); if (s
) *s
= '\0';}
534 addr
->smtp_greeting
= smtp_greeting
;
537 {uschar
* s
= Ustrchr(helo_response
, '\n'); if (s
) *s
= '\0';}
538 addr
->helo_response
= helo_response
;
545 set_errno_nohost(address_item
*addrlist
, int errno_value
, uschar
*msg
, int rc
,
548 set_errno(addrlist
, errno_value
, msg
, rc
, pass_message
, NULL
549 #ifdef EXPERIMENTAL_DSN_INFO
556 /*************************************************
557 * Check an SMTP response *
558 *************************************************/
560 /* This function is given an errno code and the SMTP response buffer
561 to analyse, together with the host identification for generating messages. It
562 sets an appropriate message and puts the first digit of the response code into
563 the yield variable. If no response was actually read, a suitable digit is
567 host the current host, to get its name for messages
568 errno_value pointer to the errno value
569 more_errno from the top address for use with ERRNO_FILTER_FAIL
570 buffer the SMTP response buffer
571 yield where to put a one-digit SMTP response code
572 message where to put an error message
573 pass_message set TRUE if message is an SMTP response
575 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
579 check_response(host_item
*host
, int *errno_value
, int more_errno
,
580 uschar
*buffer
, int *yield
, uschar
**message
, BOOL
*pass_message
)
582 uschar
* pl
= pipelining_active
? US
"pipelined " : US
"";
585 *yield
= '4'; /* Default setting is to give a temporary error */
589 case ETIMEDOUT
: /* Handle response timeout */
590 *message
= US
string_sprintf("SMTP timeout after %s%s",
592 if (transport_count
> 0)
593 *message
= US
string_sprintf("%s (%d bytes written)", *message
,
597 case ERRNO_SMTPFORMAT
: /* Handle malformed SMTP response */
598 s
= string_printing(buffer
);
599 while (isspace(*s
)) s
++;
601 ? string_sprintf("Malformed SMTP reply (an empty line) "
602 "in response to %s%s", pl
, smtp_command
)
603 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
604 pl
, smtp_command
, s
);
607 case ERRNO_TLSFAILURE
: /* Handle bad first read; can happen with
609 *message
= US
"bad first read from TLS conn";
612 case ERRNO_FILTER_FAIL
: /* Handle a failed filter process error;
613 can't send QUIT as we mustn't end the DATA. */
614 *message
= string_sprintf("transport filter process failed (%d)%s",
616 more_errno
== EX_EXECFAILED
? ": unable to execute command" : "");
619 case ERRNO_CHHEADER_FAIL
: /* Handle a failed add_headers expansion;
620 can't send QUIT as we mustn't end the DATA. */
622 string_sprintf("failed to expand headers_add or headers_remove: %s",
623 expand_string_message
);
626 case ERRNO_WRITEINCOMPLETE
: /* failure to write a complete data block */
627 *message
= US
"failed to write a data block";
631 case ERRNO_UTF8_FWD
: /* no advertised SMTPUTF8, for international message */
632 *message
= US
"utf8 support required but not offered for forwarding";
633 DEBUG(D_deliver
|D_transport
) debug_printf("%s\n", *message
);
638 /* Handle error responses from the remote mailer. */
642 *message
= string_sprintf("SMTP error from remote mail server after %s%s: "
643 "%s", pl
, smtp_command
, s
= string_printing(buffer
));
644 *pass_message
= TRUE
;
649 /* No data was read. If there is no errno, this must be the EOF (i.e.
650 connection closed) case, which causes deferral. An explicit connection reset
651 error has the same effect. Otherwise, put the host's identity in the message,
652 leaving the errno value to be interpreted as well. In all cases, we have to
653 assume the connection is now dead. */
655 if (*errno_value
== 0 || *errno_value
== ECONNRESET
)
657 *errno_value
= ERRNO_SMTPCLOSED
;
658 *message
= US
string_sprintf("Remote host closed connection "
659 "in response to %s%s", pl
, smtp_command
);
662 *message
= US
string_sprintf("%s [%s]", host
->name
, host
->address
);
669 /*************************************************
670 * Write error message to logs *
671 *************************************************/
673 /* This writes to the main log and to the message log.
676 host the current host
677 detail the current message (addr_item->message)
678 basic_errno the errno (addr_item->basic_errno)
684 write_logs(const host_item
*host
, const uschar
*suffix
, int basic_errno
)
686 gstring
* message
= LOGGING(outgoing_port
)
687 ? string_fmt_append(NULL
, "H=%s [%s]:%d", host
->name
, host
->address
,
688 host
->port
== PORT_NONE
? 25 : host
->port
)
689 : string_fmt_append(NULL
, "H=%s [%s]", host
->name
, host
->address
);
693 message
= string_fmt_append(message
, ": %s", suffix
);
695 message
= string_fmt_append(message
, ": %s", strerror(basic_errno
));
698 message
= string_fmt_append(message
, " %s", exim_errstr(basic_errno
));
700 log_write(0, LOG_MAIN
, "%s", string_from_gstring(message
));
701 deliver_msglog("%s %s\n", tod_stamp(tod_log
), message
->s
);
705 msglog_line(host_item
* host
, uschar
* message
)
707 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log
),
708 host
->name
, host
->address
, message
);
713 #ifndef DISABLE_EVENT
714 /*************************************************
715 * Post-defer action *
716 *************************************************/
718 /* This expands an arbitrary per-transport string.
719 It might, for example, be used to write to the database log.
722 addr the address item containing error information
723 host the current host
729 deferred_event_raise(address_item
*addr
, host_item
*host
)
731 uschar
* action
= addr
->transport
->event_action
;
732 const uschar
* save_domain
;
738 save_domain
= deliver_domain
;
739 save_local
= deliver_localpart
;
741 /*XXX would ip & port already be set up? */
742 deliver_host_address
= string_copy(host
->address
);
743 deliver_host_port
= host
->port
== PORT_NONE
? 25 : host
->port
;
744 event_defer_errno
= addr
->basic_errno
;
746 router_name
= addr
->router
->name
;
747 transport_name
= addr
->transport
->name
;
748 deliver_domain
= addr
->domain
;
749 deliver_localpart
= addr
->local_part
;
751 (void) event_raise(action
, US
"msg:host:defer",
753 ? addr
->basic_errno
> 0
754 ? string_sprintf("%s: %s", addr
->message
, strerror(addr
->basic_errno
))
755 : string_copy(addr
->message
)
756 : addr
->basic_errno
> 0
757 ? string_copy(US
strerror(addr
->basic_errno
))
760 deliver_localpart
= save_local
;
761 deliver_domain
= save_domain
;
762 router_name
= transport_name
= NULL
;
766 /*************************************************
767 * Reap SMTP specific responses *
768 *************************************************/
770 smtp_discard_responses(smtp_context
* sx
, smtp_transport_options_block
* ob
,
773 uschar flushbuffer
[4096];
777 if (!smtp_read_response(sx
, flushbuffer
, sizeof(flushbuffer
),
778 '2', ob
->command_timeout
)
779 && (errno
!= 0 || flushbuffer
[0] == 0))
786 /* Return boolean success */
789 smtp_reap_banner(smtp_context
* sx
)
791 BOOL good_response
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
792 '2', (SOB sx
->conn_args
.ob
)->command_timeout
);
793 #ifdef EXPERIMENTAL_DSN_INFO
794 sx
->smtp_greeting
= string_copy(sx
->buffer
);
796 return good_response
;
800 smtp_reap_ehlo(smtp_context
* sx
)
802 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
803 (SOB sx
->conn_args
.ob
)->command_timeout
))
805 if (errno
!= 0 || sx
->buffer
[0] == 0 || sx
->lmtp
)
807 #ifdef EXPERIMENTAL_DSN_INFO
808 sx
->helo_response
= string_copy(sx
->buffer
);
814 #ifdef EXPERIMENTAL_DSN_INFO
815 sx
->helo_response
= string_copy(sx
->buffer
);
817 #ifndef DISABLE_EVENT
818 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
819 US
"smtp:ehlo", sx
->buffer
);
826 #ifdef SUPPORT_PIPE_CONNECT
828 ehlo_cache_key(const smtp_context
* sx
)
830 host_item
* host
= sx
->conn_args
.host
;
831 return Ustrchr(host
->address
, ':')
832 ? string_sprintf("[%s]:%d.EHLO", host
->address
,
833 host
->port
== PORT_NONE
? sx
->port
: host
->port
)
834 : string_sprintf("%s:%d.EHLO", host
->address
,
835 host
->port
== PORT_NONE
? sx
->port
: host
->port
);
839 write_ehlo_cache_entry(const smtp_context
* sx
)
841 open_db dbblock
, * dbm_file
;
843 if ((dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
, TRUE
)))
845 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
846 dbdata_ehlo_resp er
= { .data
= sx
->ehlo_resp
};
848 HDEBUG(D_transport
) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
849 sx
->ehlo_resp
.cleartext_features
, sx
->ehlo_resp
.cleartext_auths
,
850 sx
->ehlo_resp
.crypted_features
, sx
->ehlo_resp
.crypted_auths
);
852 dbfn_write(dbm_file
, ehlo_resp_key
, &er
, (int)sizeof(er
));
853 dbfn_close(dbm_file
);
858 invalidate_ehlo_cache_entry(smtp_context
* sx
)
860 open_db dbblock
, * dbm_file
;
862 if ( sx
->early_pipe_active
863 && (dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
, TRUE
)))
865 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
866 dbfn_delete(dbm_file
, ehlo_resp_key
);
867 dbfn_close(dbm_file
);
872 read_ehlo_cache_entry(smtp_context
* sx
)
877 if (!(dbm_file
= dbfn_open(US
"misc", O_RDONLY
, &dbblock
, FALSE
, TRUE
)))
878 { DEBUG(D_transport
) debug_printf("ehlo-cache: no misc DB\n"); }
881 uschar
* ehlo_resp_key
= ehlo_cache_key(sx
);
882 dbdata_ehlo_resp
* er
;
884 if (!(er
= dbfn_read(dbm_file
, ehlo_resp_key
)))
885 { DEBUG(D_transport
) debug_printf("no ehlo-resp record\n"); }
886 else if (time(NULL
) - er
->time_stamp
> retry_data_expire
)
888 DEBUG(D_transport
) debug_printf("ehlo-resp record too old\n");
889 dbfn_close(dbm_file
);
890 if ((dbm_file
= dbfn_open(US
"misc", O_RDWR
, &dbblock
, TRUE
, TRUE
)))
891 dbfn_delete(dbm_file
, ehlo_resp_key
);
895 sx
->ehlo_resp
= er
->data
;
896 dbfn_close(dbm_file
);
897 DEBUG(D_transport
) debug_printf(
898 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
899 er
->data
.cleartext_features
, er
->data
.crypted_features
);
902 dbfn_close(dbm_file
);
909 /* Return an auths bitmap for the set of AUTH methods offered by the server
910 which match our authenticators. */
912 static unsigned short
913 study_ehlo_auths(smtp_context
* sx
)
918 unsigned short authbits
= 0;
920 if (!sx
->esmtp
) return 0;
921 if (!regex_AUTH
) regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
922 if (!regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)) return 0;
923 expand_nmax
= -1; /* reset */
924 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
926 for (au
= auths
, authnum
= 0; au
; au
= au
->next
, authnum
++) if (au
->client
)
928 const uschar
* list
= names
;
932 while (string_nextinlist(&list
, &sep
, name
, sizeof(name
)))
933 if (strcmpic(au
->public_name
, name
) == 0)
934 { authbits
|= BIT(authnum
); break; }
938 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
939 tls_out
.active
.sock
>= 0 ? "crypted" : "plaintext", names
, authbits
);
941 if (tls_out
.active
.sock
>= 0)
942 sx
->ehlo_resp
.crypted_auths
= authbits
;
944 sx
->ehlo_resp
.cleartext_auths
= authbits
;
951 /* Wait for and check responses for early-pipelining.
953 Called from the lower-level smtp_read_response() function
954 used for general code that assume synchronisation, if context
955 flags indicate outstanding early-pipelining commands. Also
956 called fom sync_responses() which handles pipelined commands.
959 sx smtp connection context
960 countp number of outstanding responses, adjusted on return
964 DEFER error on first read of TLS'd conn
965 FAIL SMTP error in response
968 smtp_reap_early_pipe(smtp_context
* sx
, int * countp
)
970 BOOL pending_BANNER
= sx
->pending_BANNER
;
971 BOOL pending_EHLO
= sx
->pending_EHLO
;
974 sx
->pending_BANNER
= FALSE
; /* clear early to avoid recursion */
975 sx
->pending_EHLO
= FALSE
;
979 DEBUG(D_transport
) debug_printf("%s expect banner\n", __FUNCTION__
);
981 if (!smtp_reap_banner(sx
))
983 DEBUG(D_transport
) debug_printf("bad banner\n");
984 if (tls_out
.active
.sock
>= 0) rc
= DEFER
;
991 unsigned peer_offered
;
992 unsigned short authbits
= 0, * ap
;
994 DEBUG(D_transport
) debug_printf("%s expect ehlo\n", __FUNCTION__
);
996 if (!smtp_reap_ehlo(sx
))
998 DEBUG(D_transport
) debug_printf("bad response for EHLO\n");
999 if (tls_out
.active
.sock
>= 0) rc
= DEFER
;
1003 /* Compare the actual EHLO response to the cached value we assumed;
1004 on difference, dump or rewrite the cache and arrange for a retry. */
1006 ap
= tls_out
.active
.sock
< 0
1007 ? &sx
->ehlo_resp
.cleartext_auths
: &sx
->ehlo_resp
.crypted_auths
;
1009 peer_offered
= ehlo_response(sx
->buffer
,
1010 (tls_out
.active
.sock
< 0 ? OPTION_TLS
: 0)
1011 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
1012 | OPTION_UTF8
| OPTION_EARLY_PIPE
1014 if ( peer_offered
!= sx
->peer_offered
1015 || (authbits
= study_ehlo_auths(sx
)) != *ap
)
1018 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1019 tls_out
.active
.sock
< 0 ? "cleartext" : "crypted",
1020 sx
->peer_offered
, *ap
, peer_offered
, authbits
);
1021 *(tls_out
.active
.sock
< 0
1022 ? &sx
->ehlo_resp
.cleartext_features
: &sx
->ehlo_resp
.crypted_features
) = peer_offered
;
1024 if (peer_offered
& OPTION_EARLY_PIPE
)
1025 write_ehlo_cache_entry(sx
);
1027 invalidate_ehlo_cache_entry(sx
);
1029 return OK
; /* just carry on */
1035 invalidate_ehlo_cache_entry(sx
);
1036 (void) smtp_discard_responses(sx
, sx
->conn_args
.ob
, *countp
);
1042 /*************************************************
1043 * Synchronize SMTP responses *
1044 *************************************************/
1046 /* This function is called from smtp_deliver() to receive SMTP responses from
1047 the server, and match them up with the commands to which they relate. When
1048 PIPELINING is not in use, this function is called after every command, and is
1049 therefore somewhat over-engineered, but it is simpler to use a single scheme
1050 that works both with and without PIPELINING instead of having two separate sets
1053 The set of commands that are buffered up with pipelining may start with MAIL
1054 and may end with DATA; in between are RCPT commands that correspond to the
1055 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1056 etc.) are never buffered.
1058 Errors after MAIL or DATA abort the whole process leaving the response in the
1059 buffer. After MAIL, pending responses are flushed, and the original command is
1060 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1061 permitted to reject some recipient addresses while accepting others. However
1062 certain errors clearly abort the whole process. Set the value in
1063 transport_return to PENDING_OK if the address is accepted. If there is a
1064 subsequent general error, it will get reset accordingly. If not, it will get
1065 converted to OK at the end.
1068 sx smtp connection context
1069 count the number of responses to read
1070 pending_DATA 0 if last command sent was not DATA
1071 +1 if previously had a good recipient
1072 -1 if not previously had a good recipient
1074 Returns: 3 if at least one address had 2xx and one had 5xx
1075 2 if at least one address had 5xx but none had 2xx
1076 1 if at least one host had a 2xx response, but none had 5xx
1077 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1078 -1 timeout while reading RCPT response
1079 -2 I/O or other non-response error for RCPT
1080 -3 DATA or MAIL failed - errno and buffer set
1081 -4 banner or EHLO failed (early-pipelining)
1082 -5 banner or EHLO failed (early-pipelining, TLS)
1086 sync_responses(smtp_context
* sx
, int count
, int pending_DATA
)
1088 address_item
* addr
= sx
->sync_addr
;
1089 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
;
1092 #ifdef SUPPORT_PIPE_CONNECT
1094 if ((rc
= smtp_reap_early_pipe(sx
, &count
)) != OK
)
1095 return rc
== FAIL
? -4 : -5;
1098 /* Handle the response for a MAIL command. On error, reinstate the original
1099 command in big_buffer for error message use, and flush any further pending
1100 responses before returning, except after I/O errors and timeouts. */
1102 if (sx
->pending_MAIL
)
1104 DEBUG(D_transport
) debug_printf("%s expect mail\n", __FUNCTION__
);
1106 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1107 '2', ob
->command_timeout
))
1109 DEBUG(D_transport
) debug_printf("bad response for MAIL\n");
1110 Ustrcpy(big_buffer
, mail_command
); /* Fits, because it came from there! */
1111 if (errno
== ERRNO_TLSFAILURE
)
1113 if (errno
== 0 && sx
->buffer
[0] != 0)
1116 if (sx
->buffer
[0] == '4')
1118 save_errno
= ERRNO_MAIL4XX
;
1119 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1121 count
= smtp_discard_responses(sx
, ob
, count
);
1125 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1126 while (count
-- > 0) /* Mark any pending addrs with the host used */
1128 while (addr
->transport_return
!= PENDING_DEFER
) addr
= addr
->next
;
1129 addr
->host_used
= sx
->conn_args
.host
;
1136 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1138 /* Read and handle the required number of RCPT responses, matching each one up
1139 with an address by scanning for the next address whose status is PENDING_DEFER.
1144 while (addr
->transport_return
!= PENDING_DEFER
)
1145 if (!(addr
= addr
->next
))
1148 /* The address was accepted */
1149 addr
->host_used
= sx
->conn_args
.host
;
1151 DEBUG(D_transport
) debug_printf("%s expect rcpt\n", __FUNCTION__
);
1152 if (smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1153 '2', ob
->command_timeout
))
1156 addr
->transport_return
= PENDING_OK
;
1158 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1159 ensure that any address-specific retry record is expunged. We do this both
1160 for the basic key and for the version that also includes the sender. */
1162 if (testflag(addr
, af_dr_retry_exists
))
1164 uschar
*altkey
= string_sprintf("%s:<%s>", addr
->address_retry_key
,
1166 retry_add_item(addr
, altkey
, rf_delete
);
1167 retry_add_item(addr
, addr
->address_retry_key
, rf_delete
);
1171 /* Error on first TLS read */
1173 else if (errno
== ERRNO_TLSFAILURE
)
1176 /* Timeout while reading the response */
1178 else if (errno
== ETIMEDOUT
)
1180 uschar
*message
= string_sprintf("SMTP timeout after RCPT TO:<%s>",
1181 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1182 set_errno_nohost(sx
->first_addr
, ETIMEDOUT
, message
, DEFER
, FALSE
);
1183 retry_add_item(addr
, addr
->address_retry_key
, 0);
1184 update_waiting
= FALSE
;
1188 /* Handle other errors in obtaining an SMTP response by returning -1. This
1189 will cause all the addresses to be deferred. Restore the SMTP command in
1190 big_buffer for which we are checking the response, so the error message
1193 else if (errno
!= 0 || sx
->buffer
[0] == 0)
1195 gstring gs
= { .size
= big_buffer_size
, .ptr
= 0, .s
= big_buffer
}, * g
= &gs
;
1197 /* Use taint-unchecked routines for writing into big_buffer, trusting
1198 that we'll never expand it. */
1200 g
= string_fmt_append_f(g
, SVFMT_TAINT_NOCHK
, "RCPT TO:<%s>",
1201 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1202 string_from_gstring(g
);
1206 /* Handle SMTP permanent and temporary response codes. */
1211 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1212 "%s", transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
),
1213 string_printing(sx
->buffer
));
1214 setflag(addr
, af_pass_message
);
1216 msglog_line(sx
->conn_args
.host
, addr
->message
);
1218 /* The response was 5xx */
1220 if (sx
->buffer
[0] == '5')
1222 addr
->transport_return
= FAIL
;
1226 /* The response was 4xx */
1230 addr
->transport_return
= DEFER
;
1231 addr
->basic_errno
= ERRNO_RCPT4XX
;
1232 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1236 #ifndef DISABLE_EVENT
1237 event_defer_errno
= addr
->more_errno
;
1238 msg_event_raise(US
"msg:rcpt:host:defer", addr
);
1241 /* Log temporary errors if there are more hosts to be tried.
1242 If not, log this last one in the == line. */
1244 if (sx
->conn_args
.host
->next
)
1245 if (LOGGING(outgoing_port
))
1246 log_write(0, LOG_MAIN
, "H=%s [%s]:%d %s", sx
->conn_args
.host
->name
,
1247 sx
->conn_args
.host
->address
,
1248 sx
->port
== PORT_NONE
? 25 : sx
->port
, addr
->message
);
1250 log_write(0, LOG_MAIN
, "H=%s [%s]: %s", sx
->conn_args
.host
->name
,
1251 sx
->conn_args
.host
->address
, addr
->message
);
1253 #ifndef DISABLE_EVENT
1255 msg_event_raise(US
"msg:rcpt:defer", addr
);
1258 /* Do not put this message on the list of those waiting for specific
1259 hosts, as otherwise it is likely to be tried too often. */
1261 update_waiting
= FALSE
;
1263 /* Add a retry item for the address so that it doesn't get tried again
1264 too soon. If address_retry_include_sender is true, add the sender address
1265 to the retry key. */
1267 retry_add_item(addr
,
1268 ob
->address_retry_include_sender
1269 ? string_sprintf("%s:<%s>", addr
->address_retry_key
, sender_address
)
1270 : addr
->address_retry_key
,
1275 } /* Loop for next RCPT response */
1277 /* Update where to start at for the next block of responses, unless we
1278 have already handled all the addresses. */
1280 if (addr
) sx
->sync_addr
= addr
->next
;
1282 /* Handle a response to DATA. If we have not had any good recipients, either
1283 previously or in this block, the response is ignored. */
1285 if (pending_DATA
!= 0)
1287 DEBUG(D_transport
) debug_printf("%s expect data\n", __FUNCTION__
);
1288 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1289 '3', ob
->command_timeout
))
1295 if (errno
== ERRNO_TLSFAILURE
) /* Error on first TLS read */
1298 if (pending_DATA
> 0 || (yield
& 1) != 0)
1300 if (errno
== 0 && sx
->buffer
[0] == '4')
1302 errno
= ERRNO_DATA4XX
;
1303 sx
->first_addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1307 (void)check_response(sx
->conn_args
.host
, &errno
, 0, sx
->buffer
, &code
, &msg
, &pass_message
);
1308 DEBUG(D_transport
) debug_printf("%s\nerror for DATA ignored: pipelining "
1309 "is in use and there were no good recipients\n", msg
);
1313 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1314 present) received 3xx. If any RCPTs were handled and yielded anything other
1315 than 4xx, yield will be set non-zero. */
1324 /* Try an authenticator's client entry */
1327 try_authenticator(smtp_context
* sx
, auth_instance
* au
)
1329 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1330 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1333 sx
->outblock
.authenticating
= TRUE
;
1334 rc
= (au
->info
->clientcode
)(au
, sx
, ob
->command_timeout
,
1335 sx
->buffer
, sizeof(sx
->buffer
));
1336 sx
->outblock
.authenticating
= FALSE
;
1337 DEBUG(D_transport
) debug_printf("%s authenticator yielded %d\n", au
->name
, rc
);
1339 /* A temporary authentication failure must hold up delivery to
1340 this host. After a permanent authentication failure, we carry on
1341 to try other authentication methods. If all fail hard, try to
1342 deliver the message unauthenticated unless require_auth was set. */
1347 f
.smtp_authenticated
= TRUE
; /* stops the outer loop */
1348 client_authenticator
= au
->name
;
1349 if (au
->set_client_id
)
1350 client_authenticated_id
= expand_string(au
->set_client_id
);
1353 /* Failure after writing a command */
1358 /* Failure after reading a response */
1361 if (errno
!= 0 || sx
->buffer
[0] != '5') return FAIL
;
1362 log_write(0, LOG_MAIN
, "%s authenticator failed H=%s [%s] %s",
1363 au
->name
, host
->name
, host
->address
, sx
->buffer
);
1366 /* Failure by some other means. In effect, the authenticator
1367 decided it wasn't prepared to handle this case. Typically this
1368 is the result of "fail" in an expansion string. Do we need to
1369 log anything here? Feb 2006: a message is now put in the buffer
1370 if logging is required. */
1373 if (*sx
->buffer
!= 0)
1374 log_write(0, LOG_MAIN
, "%s authenticator cancelled "
1375 "authentication H=%s [%s] %s", au
->name
, host
->name
,
1376 host
->address
, sx
->buffer
);
1379 /* Internal problem, message in buffer. */
1382 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHPROB
, string_copy(sx
->buffer
),
1392 /* Do the client side of smtp-level authentication.
1395 sx smtp connection context
1397 sx->buffer should have the EHLO response from server (gets overwritten)
1400 OK Success, or failed (but not required): global "smtp_authenticated" set
1401 DEFER Failed authentication (and was required)
1402 ERROR Internal problem
1404 FAIL_SEND Failed communications - transmit
1409 smtp_auth(smtp_context
* sx
)
1411 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1412 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1413 int require_auth
= verify_check_given_host(CUSS
&ob
->hosts_require_auth
, host
);
1414 #ifdef SUPPORT_PIPE_CONNECT
1415 unsigned short authbits
= tls_out
.active
.sock
>= 0
1416 ? sx
->ehlo_resp
.crypted_auths
: sx
->ehlo_resp
.cleartext_auths
;
1418 uschar
* fail_reason
= US
"server did not advertise AUTH support";
1420 f
.smtp_authenticated
= FALSE
;
1421 client_authenticator
= client_authenticated_id
= client_authenticated_sender
= NULL
;
1424 regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
1426 /* Is the server offering AUTH? */
1430 #ifdef SUPPORT_PIPE_CONNECT
1431 sx
->early_pipe_active
? authbits
1434 regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)
1437 uschar
* names
= NULL
;
1438 expand_nmax
= -1; /* reset */
1440 #ifdef SUPPORT_PIPE_CONNECT
1441 if (!sx
->early_pipe_active
)
1443 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
1445 /* Must not do this check until after we have saved the result of the
1446 regex match above as the check could be another RE. */
1448 if ( require_auth
== OK
1449 || verify_check_given_host(CUSS
&ob
->hosts_try_auth
, host
) == OK
)
1451 DEBUG(D_transport
) debug_printf("scanning authentication mechanisms\n");
1452 fail_reason
= US
"no common mechanisms were found";
1454 #ifdef SUPPORT_PIPE_CONNECT
1455 if (sx
->early_pipe_active
)
1457 /* Scan our authenticators (which support use by a client and were offered
1458 by the server (checked at cache-write time)), not suppressed by
1459 client_condition. If one is found, attempt to authenticate by calling its
1460 client function. We are limited to supporting up to 16 authenticator
1461 public-names by the number of bits in a short. */
1467 for (bitnum
= 0, au
= auths
;
1468 !f
.smtp_authenticated
&& au
&& bitnum
< 16;
1469 bitnum
++, au
= au
->next
) if (authbits
& BIT(bitnum
))
1471 if ( au
->client_condition
1472 && !expand_check_condition(au
->client_condition
, au
->name
,
1473 US
"client authenticator"))
1475 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1476 au
->name
, "client_condition is false");
1480 /* Found data for a listed mechanism. Call its client entry. Set
1481 a flag in the outblock so that data is overwritten after sending so
1482 that reflections don't show it. */
1484 fail_reason
= US
"authentication attempt(s) failed";
1486 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1493 /* Scan the configured authenticators looking for one which is configured
1494 for use as a client, which is not suppressed by client_condition, and
1495 whose name matches an authentication mechanism supported by the server.
1496 If one is found, attempt to authenticate by calling its client function.
1499 for (auth_instance
* au
= auths
; !f
.smtp_authenticated
&& au
; au
= au
->next
)
1504 || ( au
->client_condition
1505 && !expand_check_condition(au
->client_condition
, au
->name
,
1506 US
"client authenticator")))
1508 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1510 (au
->client
)? "client_condition is false" :
1511 "not configured as a client");
1515 /* Loop to scan supported server mechanisms */
1519 int len
= Ustrlen(au
->public_name
);
1522 while (isspace(*p
)) p
++;
1524 if (strncmpic(au
->public_name
, p
, len
) != 0 ||
1525 (p
[len
] != 0 && !isspace(p
[len
])))
1527 while (*p
!= 0 && !isspace(*p
)) p
++;
1531 /* Found data for a listed mechanism. Call its client entry. Set
1532 a flag in the outblock so that data is overwritten after sending so
1533 that reflections don't show it. */
1535 fail_reason
= US
"authentication attempt(s) failed";
1537 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1540 break; /* If not authenticated, try next authenticator */
1541 } /* Loop for scanning supported server mechanisms */
1542 } /* Loop for further authenticators */
1546 /* If we haven't authenticated, but are required to, give up. */
1548 if (require_auth
== OK
&& !f
.smtp_authenticated
)
1550 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHFAIL
,
1551 string_sprintf("authentication required but %s", fail_reason
), DEFER
,
1560 /* Construct AUTH appendix string for MAIL TO */
1563 buffer to build string
1564 addrlist chain of potential addresses to deliver
1565 ob transport options
1567 Globals f.smtp_authenticated
1568 client_authenticated_sender
1569 Return True on error, otherwise buffer has (possibly empty) terminated string
1573 smtp_mail_auth_str(uschar
*buffer
, unsigned bufsize
, address_item
*addrlist
,
1574 smtp_transport_options_block
*ob
)
1576 uschar
* local_authenticated_sender
= authenticated_sender
;
1579 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender
, ob
->authenticated_sender
, f
.smtp_authenticated
?"Y":"N");
1582 if (ob
->authenticated_sender
)
1584 uschar
*new = expand_string(ob
->authenticated_sender
);
1587 if (!f
.expand_string_forcedfail
)
1589 uschar
*message
= string_sprintf("failed to expand "
1590 "authenticated_sender: %s", expand_string_message
);
1591 set_errno_nohost(addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
1595 else if (*new) local_authenticated_sender
= new;
1598 /* Add the authenticated sender address if present */
1600 if ( (f
.smtp_authenticated
|| ob
->authenticated_sender_force
)
1601 && local_authenticated_sender
)
1603 string_format_nt(buffer
, bufsize
, " AUTH=%s",
1604 auth_xtextencode(local_authenticated_sender
,
1605 Ustrlen(local_authenticated_sender
)));
1606 client_authenticated_sender
= string_copy(local_authenticated_sender
);
1616 typedef struct smtp_compare_s
1618 uschar
*current_sender_address
;
1619 struct transport_instance
*tblock
;
1623 /* Create a unique string that identifies this message, it is based on
1624 sender_address, helo_data and tls_certificate if enabled.
1628 smtp_local_identity(uschar
* sender
, struct transport_instance
* tblock
)
1630 address_item
* addr1
;
1631 uschar
* if1
= US
"";
1632 uschar
* helo1
= US
"";
1634 uschar
* tlsc1
= US
"";
1636 uschar
* save_sender_address
= sender_address
;
1637 uschar
* local_identity
= NULL
;
1638 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
1640 sender_address
= sender
;
1642 addr1
= deliver_make_addr (sender
, TRUE
);
1643 deliver_set_expansions(addr1
);
1646 if1
= expand_string(ob
->interface
);
1649 helo1
= expand_string(ob
->helo_data
);
1652 if (ob
->tls_certificate
)
1653 tlsc1
= expand_string(ob
->tls_certificate
);
1654 local_identity
= string_sprintf ("%s^%s^%s", if1
, helo1
, tlsc1
);
1656 local_identity
= string_sprintf ("%s^%s", if1
, helo1
);
1659 deliver_set_expansions(NULL
);
1660 sender_address
= save_sender_address
;
1662 return local_identity
;
1667 /* This routine is a callback that is called from transport_check_waiting.
1668 This function will evaluate the incoming message versus the previous
1669 message. If the incoming message is using a different local identity then
1670 we will veto this new message. */
1673 smtp_are_same_identities(uschar
* message_id
, smtp_compare_t
* s_compare
)
1675 uschar
* message_local_identity
,
1676 * current_local_identity
,
1677 * new_sender_address
;
1679 current_local_identity
=
1680 smtp_local_identity(s_compare
->current_sender_address
, s_compare
->tblock
);
1682 if (!(new_sender_address
= deliver_get_sender_address(message_id
)))
1685 message_local_identity
=
1686 smtp_local_identity(new_sender_address
, s_compare
->tblock
);
1688 return Ustrcmp(current_local_identity
, message_local_identity
) == 0;
1694 ehlo_response(uschar
* buf
, unsigned checks
)
1696 size_t bsize
= Ustrlen(buf
);
1698 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1701 if ( checks
& OPTION_TLS
1702 && pcre_exec(regex_STARTTLS
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1704 checks
&= ~OPTION_TLS
;
1706 if ( checks
& OPTION_IGNQ
1707 && pcre_exec(regex_IGNOREQUOTA
, NULL
, CS buf
, bsize
, 0,
1708 PCRE_EOPT
, NULL
, 0) < 0)
1709 checks
&= ~OPTION_IGNQ
;
1711 if ( checks
& OPTION_CHUNKING
1712 && pcre_exec(regex_CHUNKING
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1713 checks
&= ~OPTION_CHUNKING
;
1715 #ifndef DISABLE_PRDR
1716 if ( checks
& OPTION_PRDR
1717 && pcre_exec(regex_PRDR
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1719 checks
&= ~OPTION_PRDR
;
1722 if ( checks
& OPTION_UTF8
1723 && pcre_exec(regex_UTF8
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1725 checks
&= ~OPTION_UTF8
;
1727 if ( checks
& OPTION_DSN
1728 && pcre_exec(regex_DSN
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1729 checks
&= ~OPTION_DSN
;
1731 if ( checks
& OPTION_PIPE
1732 && pcre_exec(regex_PIPELINING
, NULL
, CS buf
, bsize
, 0,
1733 PCRE_EOPT
, NULL
, 0) < 0)
1734 checks
&= ~OPTION_PIPE
;
1736 if ( checks
& OPTION_SIZE
1737 && pcre_exec(regex_SIZE
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1738 checks
&= ~OPTION_SIZE
;
1740 #ifdef SUPPORT_PIPE_CONNECT
1741 if ( checks
& OPTION_EARLY_PIPE
1742 && pcre_exec(regex_EARLY_PIPE
, NULL
, CS buf
, bsize
, 0,
1743 PCRE_EOPT
, NULL
, 0) < 0)
1745 checks
&= ~OPTION_EARLY_PIPE
;
1747 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1753 /* Callback for emitting a BDAT data chunk header.
1755 If given a nonzero size, first flush any buffered SMTP commands
1756 then emit the command.
1758 Reap previous SMTP command responses if requested, and always reap
1759 the response from a previous BDAT command.
1762 tctx transport context
1763 chunk_size value for SMTP BDAT command
1765 tc_chunk_last add LAST option to SMTP BDAT command
1766 tc_reap_prev reap response to previous SMTP commands
1770 DEFER TLS error on first read (EHLO-resp); errno set
1774 smtp_chunk_cmd_callback(transport_ctx
* tctx
, unsigned chunk_size
,
1777 smtp_transport_options_block
* ob
= SOB tctx
->tblock
->options_block
;
1778 smtp_context
* sx
= tctx
->smtp_context
;
1782 /* Write SMTP chunk header command. If not reaping responses, note that
1783 there may be more writes (like, the chunk data) done soon. */
1787 #ifdef SUPPORT_PIPE_CONNECT
1788 BOOL new_conn
= !!(sx
->outblock
.conn_args
);
1790 if((cmd_count
= smtp_write_command(sx
,
1791 flags
& tc_reap_prev
? SCMD_FLUSH
: SCMD_MORE
,
1792 "BDAT %u%s\r\n", chunk_size
, flags
& tc_chunk_last
? " LAST" : "")
1793 ) < 0) return ERROR
;
1794 if (flags
& tc_chunk_last
)
1795 data_command
= string_copy(big_buffer
); /* Save for later error message */
1796 #ifdef SUPPORT_PIPE_CONNECT
1797 /* That command write could have been the one that made the connection.
1798 Copy the fd from the client conn ctx (smtp transport specific) to the
1799 generic transport ctx. */
1802 tctx
->u
.fd
= sx
->outblock
.cctx
->sock
;
1806 prev_cmd_count
= cmd_count
+= sx
->cmd_count
;
1808 /* Reap responses for any previous, but not one we just emitted */
1812 if (sx
->pending_BDAT
)
1815 if (flags
& tc_reap_prev
&& prev_cmd_count
> 0)
1817 DEBUG(D_transport
) debug_printf("look for %d responses"
1818 " for previous pipelined cmds\n", prev_cmd_count
);
1820 switch(sync_responses(sx
, prev_cmd_count
, 0))
1822 case 1: /* 2xx (only) => OK */
1823 case 3: sx
->good_RCPT
= TRUE
; /* 2xx & 5xx => OK & progress made */
1824 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
1825 case 0: break; /* No 2xx or 5xx, but no probs */
1827 case -5: errno
= ERRNO_TLSFAILURE
;
1829 #ifdef SUPPORT_PIPE_CONNECT
1830 case -4: /* non-2xx for pipelined banner or EHLO */
1832 case -1: /* Timeout on RCPT */
1833 default: return ERROR
; /* I/O error, or any MAIL/DATA error */
1836 if (!sx
->pending_BDAT
)
1837 pipelining_active
= FALSE
;
1840 /* Reap response for an outstanding BDAT */
1842 if (sx
->pending_BDAT
)
1844 DEBUG(D_transport
) debug_printf("look for one response for BDAT\n");
1846 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
1847 ob
->command_timeout
))
1849 if (errno
== 0 && sx
->buffer
[0] == '4')
1851 errno
= ERRNO_DATA4XX
; /*XXX does this actually get used? */
1852 sx
->addrlist
->more_errno
|=
1853 ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1858 sx
->pending_BDAT
= FALSE
;
1859 pipelining_active
= FALSE
;
1861 else if (chunk_size
> 0)
1862 sx
->pending_BDAT
= TRUE
;
1865 sx
->cmd_count
= cmd_count
;
1873 /*************************************************
1874 * Make connection for given message *
1875 *************************************************/
1879 ctx connection context
1880 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1881 a second attempt after TLS initialization fails
1883 Returns: OK - the connection was made and the delivery attempted;
1884 fd is set in the conn context, tls_out set up.
1885 DEFER - the connection could not be made, or something failed
1886 while setting up the SMTP session, or there was a
1887 non-message-specific error, such as a timeout.
1888 ERROR - helo_data or add_headers or authenticated_sender is
1889 specified for this transport, and the string failed
1893 smtp_setup_conn(smtp_context
* sx
, BOOL suppress_tls
)
1895 smtp_transport_options_block
* ob
= sx
->conn_args
.tblock
->options_block
;
1896 BOOL pass_message
= FALSE
;
1897 uschar
* message
= NULL
;
1900 uschar
* tls_errstr
;
1903 sx
->conn_args
.ob
= ob
;
1905 sx
->lmtp
= strcmpic(ob
->protocol
, US
"lmtp") == 0;
1906 sx
->smtps
= strcmpic(ob
->protocol
, US
"smtps") == 0;
1908 sx
->send_rset
= TRUE
;
1909 sx
->send_quit
= TRUE
;
1910 sx
->setting_up
= TRUE
;
1912 sx
->esmtp_sent
= FALSE
;
1914 sx
->utf8_needed
= FALSE
;
1916 sx
->dsn_all_lasthop
= TRUE
;
1918 sx
->conn_args
.dane
= FALSE
;
1920 verify_check_given_host(CUSS
&ob
->hosts_require_dane
, sx
->conn_args
.host
) == OK
;
1922 #ifdef SUPPORT_PIPE_CONNECT
1923 sx
->early_pipe_active
= sx
->early_pipe_ok
= FALSE
;
1924 sx
->ehlo_resp
.cleartext_features
= sx
->ehlo_resp
.crypted_features
= 0;
1925 sx
->pending_BANNER
= sx
->pending_EHLO
= FALSE
;
1928 if ((sx
->max_rcpt
= sx
->conn_args
.tblock
->max_addresses
) == 0) sx
->max_rcpt
= 999999;
1929 sx
->peer_offered
= 0;
1930 sx
->avoid_option
= 0;
1931 sx
->igquotstr
= US
"";
1932 if (!sx
->helo_data
) sx
->helo_data
= ob
->helo_data
;
1933 #ifdef EXPERIMENTAL_DSN_INFO
1934 sx
->smtp_greeting
= NULL
;
1935 sx
->helo_response
= NULL
;
1938 smtp_command
= US
"initial connection";
1939 sx
->buffer
[0] = '\0';
1941 /* Set up the buffer for reading SMTP response packets. */
1943 sx
->inblock
.buffer
= sx
->inbuffer
;
1944 sx
->inblock
.buffersize
= sizeof(sx
->inbuffer
);
1945 sx
->inblock
.ptr
= sx
->inbuffer
;
1946 sx
->inblock
.ptrend
= sx
->inbuffer
;
1948 /* Set up the buffer for holding SMTP commands while pipelining */
1950 sx
->outblock
.buffer
= sx
->outbuffer
;
1951 sx
->outblock
.buffersize
= sizeof(sx
->outbuffer
);
1952 sx
->outblock
.ptr
= sx
->outbuffer
;
1953 sx
->outblock
.cmd_count
= 0;
1954 sx
->outblock
.authenticating
= FALSE
;
1955 sx
->outblock
.conn_args
= NULL
;
1957 /* Reset the parameters of a TLS session. */
1960 tls_out
.cipher
= NULL
; /* the one we may use for this transport */
1961 tls_out
.ourcert
= NULL
;
1962 tls_out
.peercert
= NULL
;
1963 tls_out
.peerdn
= NULL
;
1967 tls_out
.ocsp
= OCSP_NOT_REQ
;
1968 #ifdef EXPERIMENTAL_TLS_RESUME
1969 tls_out
.resumption
= 0;
1973 /* Flip the legacy TLS-related variables over to the outbound set in case
1974 they're used in the context of the transport. Don't bother resetting
1975 afterward (when being used by a transport) as we're in a subprocess.
1976 For verify, unflipped once the callout is dealt with */
1978 tls_modify_variables(&tls_out
);
1983 set_errno_nohost(sx
->addrlist
, ERRNO_TLSFAILURE
, US
"TLS support not available",
1989 /* Make a connection to the host if this isn't a continued delivery, and handle
1990 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1991 specially so they can be identified for retries. */
1993 if (!continue_hostname
)
1996 HDEBUG(D_verify
) debug_printf("interface=%s port=%d\n", sx
->conn_args
.interface
, sx
->port
);
1998 /* Get the actual port the connection will use, into sx->conn_args.host */
2000 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
);
2003 /* Do TLSA lookup for DANE */
2005 tls_out
.dane_verified
= FALSE
;
2006 tls_out
.tlsa_usage
= 0;
2008 if (sx
->conn_args
.host
->dnssec
== DS_YES
)
2011 if( sx
->dane_required
2012 || verify_check_given_host(CUSS
&ob
->hosts_try_dane
, sx
->conn_args
.host
) == OK
2014 switch (rc
= tlsa_lookup(sx
->conn_args
.host
, &sx
->conn_args
.tlsa_dnsa
, sx
->dane_required
))
2016 case OK
: sx
->conn_args
.dane
= TRUE
;
2017 ob
->tls_tempfail_tryclear
= FALSE
;
2019 case FAIL_FORCED
: break;
2020 default: set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2021 string_sprintf("DANE error: tlsa lookup %s",
2024 # ifndef DISABLE_EVENT
2025 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2026 US
"dane:fail", sx
->dane_required
2027 ? US
"dane-required" : US
"dnssec-invalid");
2032 else if (sx
->dane_required
)
2034 set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2035 string_sprintf("DANE error: %s lookup not DNSSEC", sx
->conn_args
.host
->name
),
2037 # ifndef DISABLE_EVENT
2038 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2039 US
"dane:fail", US
"dane-required");
2046 /* Make the TCP connection */
2048 sx
->cctx
.tls_ctx
= NULL
;
2049 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2050 sx
->avoid_option
= sx
->peer_offered
= smtp_peer_options
= 0;
2052 #ifdef SUPPORT_PIPE_CONNECT
2053 if ( verify_check_given_host(CUSS
&ob
->hosts_pipe_connect
,
2054 sx
->conn_args
.host
) == OK
)
2056 /* We don't find out the local ip address until the connect, so if
2057 the helo string might use it avoid doing early-pipelining. */
2060 || !Ustrstr(sx
->helo_data
, "$sending_ip_address")
2061 || Ustrstr(sx
->helo_data
, "def:sending_ip_address")
2064 sx
->early_pipe_ok
= TRUE
;
2065 if ( read_ehlo_cache_entry(sx
)
2066 && sx
->ehlo_resp
.cleartext_features
& OPTION_EARLY_PIPE
)
2069 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2070 sx
->early_pipe_active
= TRUE
;
2071 sx
->peer_offered
= sx
->ehlo_resp
.cleartext_features
;
2074 else DEBUG(D_transport
)
2075 debug_printf("helo needs $sending_ip_address\n");
2077 if (sx
->early_pipe_active
)
2078 sx
->outblock
.conn_args
= &sx
->conn_args
;
2082 if ((sx
->cctx
.sock
= smtp_connect(&sx
->conn_args
, NULL
)) < 0)
2084 set_errno_nohost(sx
->addrlist
,
2085 errno
== ETIMEDOUT
? ERRNO_CONNECTTIMEOUT
: errno
,
2086 sx
->verify
? US
strerror(errno
) : NULL
,
2088 sx
->send_quit
= FALSE
;
2092 /* Expand the greeting message while waiting for the initial response. (Makes
2093 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2094 delayed till here so that $sending_interface and $sending_port are set. */
2095 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2096 will be? Somehow I doubt it. */
2099 if (!(sx
->helo_data
= expand_string(sx
->helo_data
)))
2101 log_write(0, LOG_MAIN
|LOG_PANIC
,
2102 "<%s>: failed to expand transport's helo_data value for callout: %s",
2103 sx
->addrlist
->address
, expand_string_message
);
2108 expand_string_message
= NULL
;
2109 if ((sx
->helo_data
= string_domain_utf8_to_alabel(sx
->helo_data
,
2110 &expand_string_message
)),
2111 expand_string_message
)
2113 log_write(0, LOG_MAIN
|LOG_PANIC
,
2114 "<%s>: failed to expand transport's helo_data value for callout: %s",
2115 sx
->addrlist
->address
, expand_string_message
);
2117 sx
->helo_data
= NULL
;
2121 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2122 is nevertheless a reasonably clean way of programming this kind of logic,
2123 where you want to escape on any error. */
2127 #ifdef SUPPORT_PIPE_CONNECT
2128 if (sx
->early_pipe_active
)
2130 sx
->pending_BANNER
= TRUE
; /* sync_responses() must eventually handle */
2131 sx
->outblock
.cmd_count
= 1;
2137 (void) setsockopt(sx
->cctx
.sock
, IPPROTO_TCP
, TCP_QUICKACK
, US
&off
,
2140 if (!smtp_reap_banner(sx
))
2141 goto RESPONSE_FAILED
;
2144 #ifndef DISABLE_EVENT
2147 lookup_dnssec_authenticated
= sx
->conn_args
.host
->dnssec
==DS_YES
? US
"yes"
2148 : sx
->conn_args
.host
->dnssec
==DS_NO
? US
"no" : NULL
;
2149 s
= event_raise(sx
->conn_args
.tblock
->event_action
, US
"smtp:connect", sx
->buffer
);
2152 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
,
2153 string_sprintf("deferred by smtp:connect event expansion: %s", s
),
2161 /* Now check if the helo_data expansion went well, and sign off cleanly if
2166 message
= string_sprintf("failed to expand helo_data: %s",
2167 expand_string_message
);
2168 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2174 /** Debugging without sending a message
2175 sx->addrlist->transport_return = DEFER;
2179 /* Errors that occur after this point follow an SMTP command, which is
2180 left in big_buffer by smtp_write_command() for use in error messages. */
2182 smtp_command
= big_buffer
;
2184 /* Tell the remote who we are...
2186 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2187 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2188 greeting is of this form. The assumption was that the far end supports it
2189 properly... but experience shows that there are some that give 5xx responses,
2190 even though the banner includes "ESMTP" (there's a bloody-minded one that
2191 says "ESMTP not spoken here"). Cope with that case.
2193 September 2000: Time has passed, and it seems reasonable now to always send
2194 EHLO at the start. It is also convenient to make the change while installing
2197 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2198 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2199 would be no way to send out the mails, so there is now a host list
2200 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2201 PIPELINING problem as well. Maybe it can also be useful to cure other
2202 problems with broken servers.
2204 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2205 Then somebody tried it with a Microsoft mailer... It seems that all other
2206 mailers use upper case for some reason (the RFC is quite clear about case
2207 independence) so, for peace of mind, I gave in. */
2209 sx
->esmtp
= verify_check_given_host(CUSS
&ob
->hosts_avoid_esmtp
, sx
->conn_args
.host
) != OK
;
2211 /* Alas; be careful, since this goto is not an error-out, so conceivably
2212 we might set data between here and the target which we assume to exist
2213 and be usable. I can see this coming back to bite us. */
2217 smtp_peer_options
|= OPTION_TLS
;
2218 suppress_tls
= FALSE
;
2219 ob
->tls_tempfail_tryclear
= FALSE
;
2220 smtp_command
= US
"SSL-on-connect";
2227 if (smtp_write_command(sx
,
2228 #ifdef SUPPORT_PIPE_CONNECT
2229 sx
->early_pipe_active
? SCMD_BUFFER
:
2232 "%s %s\r\n", sx
->lmtp
? "LHLO" : "EHLO", sx
->helo_data
) < 0)
2234 sx
->esmtp_sent
= TRUE
;
2236 #ifdef SUPPORT_PIPE_CONNECT
2237 if (sx
->early_pipe_active
)
2239 sx
->pending_EHLO
= TRUE
;
2241 /* If we have too many authenticators to handle and might need to AUTH
2242 for this transport, pipeline no further as we will need the
2243 list of auth methods offered. Reap the banner and EHLO. */
2245 if ( (ob
->hosts_require_auth
|| ob
->hosts_try_auth
)
2246 && f
.smtp_in_early_pipe_no_auth
)
2248 DEBUG(D_transport
) debug_printf("may need to auth, so pipeline no further\n");
2249 if (smtp_write_command(sx
, SCMD_FLUSH
, NULL
) < 0)
2251 if (sync_responses(sx
, 2, 0) != 0)
2254 debug_printf("failed reaping pipelined cmd responses\n");
2255 goto RESPONSE_FAILED
;
2257 sx
->early_pipe_active
= FALSE
;
2262 if (!smtp_reap_ehlo(sx
))
2263 goto RESPONSE_FAILED
;
2267 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2269 #ifdef SUPPORT_PIPE_CONNECT
2270 if (!sx
->early_pipe_active
)
2275 int n
= sizeof(sx
->buffer
);
2276 uschar
* rsp
= sx
->buffer
;
2278 if (sx
->esmtp_sent
&& (n
= Ustrlen(sx
->buffer
)) < sizeof(sx
->buffer
)/2)
2279 { rsp
= sx
->buffer
+ n
+ 1; n
= sizeof(sx
->buffer
) - n
; }
2281 if (smtp_write_command(sx
, SCMD_FLUSH
, "HELO %s\r\n", sx
->helo_data
) < 0)
2283 good_response
= smtp_read_response(sx
, rsp
, n
, '2', ob
->command_timeout
);
2284 #ifdef EXPERIMENTAL_DSN_INFO
2285 sx
->helo_response
= string_copy(rsp
);
2289 /* Handle special logging for a closed connection after HELO
2290 when had previously sent EHLO */
2292 if (rsp
!= sx
->buffer
&& rsp
[0] == 0 && (errno
== 0 || errno
== ECONNRESET
))
2294 errno
= ERRNO_SMTPCLOSED
;
2295 goto EHLOHELO_FAILED
;
2297 memmove(sx
->buffer
, rsp
, Ustrlen(rsp
));
2298 goto RESPONSE_FAILED
;
2302 if (sx
->esmtp
|| sx
->lmtp
)
2304 #ifdef SUPPORT_PIPE_CONNECT
2305 if (!sx
->early_pipe_active
)
2308 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2309 OPTION_TLS
/* others checked later */
2310 #ifdef SUPPORT_PIPE_CONNECT
2311 | (sx
->early_pipe_ok
2313 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2322 #ifdef SUPPORT_PIPE_CONNECT
2323 if (sx
->early_pipe_ok
)
2325 sx
->ehlo_resp
.cleartext_features
= sx
->peer_offered
;
2327 if ( (sx
->peer_offered
& (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2328 == (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2330 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2331 sx
->ehlo_resp
.cleartext_auths
= study_ehlo_auths(sx
);
2332 write_ehlo_cache_entry(sx
);
2338 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2341 smtp_peer_options
|= sx
->peer_offered
& OPTION_TLS
;
2346 /* For continuing deliveries down the same channel, having re-exec'd the socket
2347 is the standard input; for a socket held open from verify it is recorded
2348 in the cutthrough context block. Either way we don't need to redo EHLO here
2349 (but may need to do so for TLS - see below).
2350 Set up the pointer to where subsequent commands will be left, for
2351 error messages. Note that smtp_peer_options will have been
2352 set from the command line if they were set in the process that passed the
2355 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2356 as the continue goes via transport_pass_socket() and doublefork and exec.
2357 It does not wait. Unclear how we keep separate host's responses
2358 separate - we could match up by host ip+port as a bodge. */
2362 if (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
)
2364 sx
->cctx
= cutthrough
.cctx
;
2365 sx
->conn_args
.host
->port
= sx
->port
= cutthrough
.host
.port
;
2369 sx
->cctx
.sock
= 0; /* stdin */
2370 sx
->cctx
.tls_ctx
= NULL
;
2371 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
); /* Record the port that was used */
2373 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2374 smtp_command
= big_buffer
;
2375 sx
->helo_data
= NULL
; /* ensure we re-expand ob->helo_data */
2377 /* For a continued connection with TLS being proxied for us, or a
2378 held-open verify connection with TLS, nothing more to do. */
2380 if ( continue_proxy_cipher
2381 || (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
2382 && cutthrough
.is_tls
)
2385 sx
->peer_offered
= smtp_peer_options
;
2386 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2387 HDEBUG(D_transport
) debug_printf("continued connection, %s TLS\n",
2388 continue_proxy_cipher
? "proxied" : "verify conn with");
2391 HDEBUG(D_transport
) debug_printf("continued connection, no TLS\n");
2394 /* If TLS is available on this connection, whether continued or not, attempt to
2395 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2396 send another EHLO - the server may give a different answer in secure mode. We
2397 use a separate buffer for reading the response to STARTTLS so that if it is
2398 negative, the original EHLO data is available for subsequent analysis, should
2399 the client not be required to use TLS. If the response is bad, copy the buffer
2400 for error analysis. */
2403 if ( smtp_peer_options
& OPTION_TLS
2405 && verify_check_given_host(CUSS
&ob
->hosts_avoid_tls
, sx
->conn_args
.host
) != OK
2407 || verify_check_given_host(CUSS
&ob
->hosts_verify_avoid_tls
, sx
->conn_args
.host
) != OK
2410 uschar buffer2
[4096];
2412 if (smtp_write_command(sx
, SCMD_FLUSH
, "STARTTLS\r\n") < 0)
2415 #ifdef SUPPORT_PIPE_CONNECT
2416 /* If doing early-pipelining reap the banner and EHLO-response but leave
2417 the response for the STARTTLS we just sent alone. */
2419 if (sx
->early_pipe_active
&& sync_responses(sx
, 2, 0) != 0)
2422 debug_printf("failed reaping pipelined cmd responses\n");
2423 goto RESPONSE_FAILED
;
2427 /* If there is an I/O error, transmission of this message is deferred. If
2428 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2429 false, we also defer. However, if there is a temporary rejection of STARTTLS
2430 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2431 STARTTLS, we carry on. This means we will try to send the message in clear,
2432 unless the host is in hosts_require_tls (tested below). */
2434 if (!smtp_read_response(sx
, buffer2
, sizeof(buffer2
), '2', ob
->command_timeout
))
2438 || (buffer2
[0] == '4' && !ob
->tls_tempfail_tryclear
)
2441 Ustrncpy(sx
->buffer
, buffer2
, sizeof(sx
->buffer
));
2442 sx
->buffer
[sizeof(sx
->buffer
)-1] = '\0';
2443 goto RESPONSE_FAILED
;
2447 /* STARTTLS accepted: try to negotiate a TLS session. */
2452 if (!tls_client_start(&sx
->cctx
, &sx
->conn_args
, sx
->addrlist
, &tls_out
, &tls_errstr
))
2454 /* TLS negotiation failed; give an error. From outside, this function may
2455 be called again to try in clear on a new connection, if the options permit
2456 it for this host. */
2460 DEBUG(D_tls
) debug_printf("TLS session fail: %s\n", tls_errstr
);
2462 # ifdef SUPPORT_DANE
2463 if (sx
->conn_args
.dane
)
2465 log_write(0, LOG_MAIN
,
2466 "DANE attempt failed; TLS connection to %s [%s]: %s",
2467 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, tls_errstr
);
2468 # ifndef DISABLE_EVENT
2469 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2470 US
"dane:fail", US
"validation-failure"); /* could do with better detail */
2475 errno
= ERRNO_TLSFAILURE
;
2476 message
= string_sprintf("TLS session: %s", tls_errstr
);
2477 sx
->send_quit
= FALSE
;
2481 /* TLS session is set up */
2483 smtp_peer_options_wrap
= smtp_peer_options
;
2484 for (address_item
* addr
= sx
->addrlist
; addr
; addr
= addr
->next
)
2485 if (addr
->transport_return
== PENDING_DEFER
)
2487 addr
->cipher
= tls_out
.cipher
;
2488 addr
->ourcert
= tls_out
.ourcert
;
2489 addr
->peercert
= tls_out
.peercert
;
2490 addr
->peerdn
= tls_out
.peerdn
;
2491 addr
->ocsp
= tls_out
.ocsp
;
2492 addr
->tlsver
= tls_out
.ver
;
2497 /* if smtps, we'll have smtp_command set to something else; always safe to
2499 smtp_command
= big_buffer
;
2501 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2502 helo_data is null, we are dealing with a connection that was passed from
2503 another process, and so we won't have expanded helo_data above. We have to
2504 expand it here. $sending_ip_address and $sending_port are set up right at the
2505 start of the Exim process (in exim.c). */
2507 if (tls_out
.active
.sock
>= 0)
2509 uschar
* greeting_cmd
;
2511 if (!sx
->helo_data
&& !(sx
->helo_data
= expand_string(ob
->helo_data
)))
2513 uschar
*message
= string_sprintf("failed to expand helo_data: %s",
2514 expand_string_message
);
2515 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2520 #ifdef SUPPORT_PIPE_CONNECT
2521 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2522 We're unlikely to get the group sent and delivered before the server sends its
2523 banner, but it's still worth sending as a group.
2524 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2527 if (sx
->smtps
? sx
->early_pipe_ok
: sx
->early_pipe_active
)
2529 sx
->peer_offered
= sx
->ehlo_resp
.crypted_features
;
2530 if ((sx
->early_pipe_active
=
2531 !!(sx
->ehlo_resp
.crypted_features
& OPTION_EARLY_PIPE
)))
2532 DEBUG(D_transport
) debug_printf("Using cached crypted PIPE_CONNECT\n");
2536 /* For SMTPS we need to wait for the initial OK response. */
2538 #ifdef SUPPORT_PIPE_CONNECT
2539 if (sx
->early_pipe_active
)
2541 sx
->pending_BANNER
= TRUE
;
2542 sx
->outblock
.cmd_count
= 1;
2546 if (!smtp_reap_banner(sx
))
2547 goto RESPONSE_FAILED
;
2550 greeting_cmd
= US
"LHLO";
2552 greeting_cmd
= US
"EHLO";
2555 greeting_cmd
= US
"HELO";
2557 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2560 if (smtp_write_command(sx
,
2561 #ifdef SUPPORT_PIPE_CONNECT
2562 sx
->early_pipe_active
? SCMD_BUFFER
:
2565 "%s %s\r\n", greeting_cmd
, sx
->helo_data
) < 0)
2568 #ifdef SUPPORT_PIPE_CONNECT
2569 if (sx
->early_pipe_active
)
2570 sx
->pending_EHLO
= TRUE
;
2574 if (!smtp_reap_ehlo(sx
))
2577 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2578 cert late, under TLS1.3 - which means here; the first time we try to
2579 receive crypted data. Treat it as if it was a connect-time failure.
2580 See also the early-pipe equivalent... which will be hard; every call
2581 to sync_responses will need to check the result.
2582 It would be nicer to have GnuTLS check the cert during the handshake.
2583 Can it do that, with all the flexibility we need? */
2585 tls_errstr
= US
"error on first read";
2586 goto GNUTLS_CONN_FAILED
;
2589 goto RESPONSE_FAILED
;
2591 smtp_peer_options
= 0;
2595 /* If the host is required to use a secure channel, ensure that we
2599 # ifdef SUPPORT_DANE
2600 || sx
->conn_args
.dane
2602 || verify_check_given_host(CUSS
&ob
->hosts_require_tls
, sx
->conn_args
.host
) == OK
2605 errno
= ERRNO_TLSREQUIRED
;
2606 message
= string_sprintf("a TLS session is required, but %s",
2607 smtp_peer_options
& OPTION_TLS
2608 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2609 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2610 if (sx
->conn_args
.dane
)
2611 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"dane:fail",
2612 smtp_peer_options
& OPTION_TLS
2613 ? US
"validation-failure" /* could do with better detail */
2614 : US
"starttls-not-supported");
2618 #endif /*DISABLE_TLS*/
2620 /* If TLS is active, we have just started it up and re-done the EHLO command,
2621 so its response needs to be analyzed. If TLS is not active and this is a
2622 continued session down a previously-used socket, we haven't just done EHLO, so
2625 if (continue_hostname
== NULL
2627 || tls_out
.active
.sock
>= 0
2631 if (sx
->esmtp
|| sx
->lmtp
)
2633 #ifdef SUPPORT_PIPE_CONNECT
2634 if (!sx
->early_pipe_active
)
2637 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2639 #ifdef SUPPORT_PIPE_CONNECT
2640 | (sx
->lmtp
&& ob
->lmtp_ignore_quota
? OPTION_IGNQ
: 0)
2641 | OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2642 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_UTF8
2643 | (tls_out
.active
.sock
>= 0 ? OPTION_EARLY_PIPE
: 0) /* not for lmtp */
2647 | (sx
->lmtp
&& ob
->lmtp_ignore_quota
? OPTION_IGNQ
: 0)
2650 # ifdef SUPPORT_I18N
2651 | (sx
->addrlist
->prop
.utf8_msg
? OPTION_UTF8
: 0)
2652 /*XXX if we hand peercaps on to continued-conn processes,
2653 must not depend on this addr */
2657 | (ob
->size_addition
>= 0 ? OPTION_SIZE
: 0)
2660 #ifdef SUPPORT_PIPE_CONNECT
2661 if (tls_out
.active
.sock
>= 0)
2662 sx
->ehlo_resp
.crypted_features
= sx
->peer_offered
;
2666 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2667 lmtp_ignore_quota option was set. */
2669 sx
->igquotstr
= sx
->peer_offered
& OPTION_IGNQ
? US
" IGNOREQUOTA" : US
"";
2671 /* If the response to EHLO specified support for the SIZE parameter, note
2672 this, provided size_addition is non-negative. */
2674 smtp_peer_options
|= sx
->peer_offered
& OPTION_SIZE
;
2676 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2677 the current host, esmtp will be false, so PIPELINING can never be used. If
2678 the current host matches hosts_avoid_pipelining, don't do it. */
2680 if ( sx
->peer_offered
& OPTION_PIPE
2681 && verify_check_given_host(CUSS
&ob
->hosts_avoid_pipelining
, sx
->conn_args
.host
) != OK
)
2682 smtp_peer_options
|= OPTION_PIPE
;
2684 DEBUG(D_transport
) debug_printf("%susing PIPELINING\n",
2685 smtp_peer_options
& OPTION_PIPE
? "" : "not ");
2687 if ( sx
->peer_offered
& OPTION_CHUNKING
2688 && verify_check_given_host(CUSS
&ob
->hosts_try_chunking
, sx
->conn_args
.host
) != OK
)
2689 sx
->peer_offered
&= ~OPTION_CHUNKING
;
2691 if (sx
->peer_offered
& OPTION_CHUNKING
)
2692 DEBUG(D_transport
) debug_printf("CHUNKING usable\n");
2694 #ifndef DISABLE_PRDR
2695 if ( sx
->peer_offered
& OPTION_PRDR
2696 && verify_check_given_host(CUSS
&ob
->hosts_try_prdr
, sx
->conn_args
.host
) != OK
)
2697 sx
->peer_offered
&= ~OPTION_PRDR
;
2699 if (sx
->peer_offered
& OPTION_PRDR
)
2700 DEBUG(D_transport
) debug_printf("PRDR usable\n");
2703 /* Note if the server supports DSN */
2704 smtp_peer_options
|= sx
->peer_offered
& OPTION_DSN
;
2705 DEBUG(D_transport
) debug_printf("%susing DSN\n",
2706 sx
->peer_offered
& OPTION_DSN
? "" : "not ");
2708 #ifdef SUPPORT_PIPE_CONNECT
2709 if ( sx
->early_pipe_ok
2710 && !sx
->early_pipe_active
2711 && tls_out
.active
.sock
>= 0
2712 && smtp_peer_options
& OPTION_PIPE
2713 && ( sx
->ehlo_resp
.cleartext_features
| sx
->ehlo_resp
.crypted_features
)
2714 & OPTION_EARLY_PIPE
)
2716 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2717 sx
->ehlo_resp
.crypted_auths
= study_ehlo_auths(sx
);
2718 write_ehlo_cache_entry(sx
);
2722 /* Note if the response to EHLO specifies support for the AUTH extension.
2723 If it has, check that this host is one we want to authenticate to, and do
2724 the business. The host name and address must be available when the
2725 authenticator's client driver is running. */
2727 switch (yield
= smtp_auth(sx
))
2729 default: goto SEND_QUIT
;
2731 case FAIL_SEND
: goto SEND_FAILED
;
2732 case FAIL
: goto RESPONSE_FAILED
;
2736 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2738 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2739 message-specific. */
2741 sx
->setting_up
= FALSE
;
2744 if (sx
->addrlist
->prop
.utf8_msg
)
2748 /* If the transport sets a downconversion mode it overrides any set by ACL
2751 if ((s
= ob
->utf8_downconvert
))
2753 if (!(s
= expand_string(s
)))
2755 message
= string_sprintf("failed to expand utf8_downconvert: %s",
2756 expand_string_message
);
2757 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2763 case '1': sx
->addrlist
->prop
.utf8_downcvt
= TRUE
;
2764 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2766 case '0': sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2767 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2769 case '-': if (s
[1] == '1')
2771 sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2772 sx
->addrlist
->prop
.utf8_downcvt_maybe
= TRUE
;
2778 sx
->utf8_needed
= !sx
->addrlist
->prop
.utf8_downcvt
2779 && !sx
->addrlist
->prop
.utf8_downcvt_maybe
;
2780 DEBUG(D_transport
) if (!sx
->utf8_needed
)
2781 debug_printf("utf8: %s downconvert\n",
2782 sx
->addrlist
->prop
.utf8_downcvt
? "mandatory" : "optional");
2785 /* If this is an international message we need the host to speak SMTPUTF8 */
2786 if (sx
->utf8_needed
&& !(sx
->peer_offered
& OPTION_UTF8
))
2788 errno
= ERRNO_UTF8_FWD
;
2789 goto RESPONSE_FAILED
;
2791 #endif /*SUPPORT_I18N*/
2800 if (errno
== ECONNREFUSED
) /* first-read error on a TFO conn */
2802 /* There is a testing facility for simulating a connection timeout, as I
2803 can't think of any other way of doing this. It converts a connection
2804 refused into a timeout if the timeout is set to 999999. This is done for
2805 a 3whs connection in ip_connect(), but a TFO connection does not error
2806 there - instead it gets ECONNREFUSED on the first data read. Tracking
2807 that a TFO really was done is too hard, or we would set a
2808 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2809 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2812 if (f
.running_in_test_harness
&& ob
->connect_timeout
== 999999)
2814 set_errno_nohost(sx
->addrlist
,
2815 errno
== ETIMEDOUT
? ERRNO_CONNECTTIMEOUT
: errno
,
2816 sx
->verify
? US
strerror(errno
) : NULL
,
2818 sx
->send_quit
= FALSE
;
2822 /* really an error on an SMTP read */
2824 sx
->send_quit
= check_response(sx
->conn_args
.host
, &errno
, sx
->addrlist
->more_errno
,
2825 sx
->buffer
, &code
, &message
, &pass_message
);
2831 message
= US
string_sprintf("send() to %s [%s] failed: %s",
2832 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, strerror(errno
));
2833 sx
->send_quit
= FALSE
;
2839 message
= string_sprintf("Remote host closed connection in response to %s"
2840 " (EHLO response was: %s)", smtp_command
, sx
->buffer
);
2841 sx
->send_quit
= FALSE
;
2845 /* This label is jumped to directly when a TLS negotiation has failed,
2846 or was not done for a host for which it is required. Values will be set
2847 in message and errno, and setting_up will always be true. Treat as
2848 a temporary error. */
2852 code
= '4', yield
= DEFER
;
2856 /* The failure happened while setting up the call; see if the failure was
2857 a 5xx response (this will either be on connection, or following HELO - a 5xx
2858 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2859 fail all addresses, as this host is never going to accept them. For other
2860 errors during setting up (timeouts or whatever), defer all addresses, and
2861 yield DEFER, so that the host is not tried again for a while.
2863 XXX This peeking for another host feels like a layering violation. We want
2864 to note the host as unusable, but down here we shouldn't know if this was
2865 the last host to try for the addr(list). Perhaps the upper layer should be
2866 the one to do set_errno() ? The problem is that currently the addr is where
2867 errno etc. are stashed, but until we run out of hosts to try the errors are
2868 host-specific. Maybe we should enhance the host_item definition? */
2871 sx
->ok
= FALSE
; /* For when reached by GOTO */
2872 set_errno(sx
->addrlist
, errno
, message
,
2873 sx
->conn_args
.host
->next
2877 || errno
== ERRNO_UTF8_FWD
2881 errno
== ECONNREFUSED
? NULL
: sx
->conn_args
.host
2882 #ifdef EXPERIMENTAL_DSN_INFO
2883 , sx
->smtp_greeting
, sx
->helo_response
2892 (void)smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n");
2895 if (sx
->cctx
.tls_ctx
)
2897 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
2898 sx
->cctx
.tls_ctx
= NULL
;
2902 /* Close the socket, and return the appropriate value, first setting
2903 works because the NULL setting is passed back to the calling process, and
2904 remote_max_parallel is forced to 1 when delivering over an existing connection,
2907 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
2910 shutdown(sx
->cctx
.sock
, SHUT_WR
);
2911 if (fcntl(sx
->cctx
.sock
, F_SETFL
, O_NONBLOCK
) == 0)
2912 for (int i
= 16; read(sx
->cctx
.sock
, sx
->inbuffer
, sizeof(sx
->inbuffer
)) > 0 && i
> 0;)
2913 i
--; /* drain socket */
2914 sx
->send_quit
= FALSE
;
2916 (void)close(sx
->cctx
.sock
);
2919 #ifndef DISABLE_EVENT
2920 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"tcp:close", NULL
);
2923 continue_transport
= NULL
;
2924 continue_hostname
= NULL
;
2931 /* Create the string of options that will be appended to the MAIL FROM:
2932 in the connection context buffer */
2935 build_mailcmd_options(smtp_context
* sx
, address_item
* addrlist
)
2937 uschar
* p
= sx
->buffer
;
2938 address_item
* addr
;
2943 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2944 send it, adding something to the message size to allow for imprecision
2945 and things that get added en route. Exim keeps the number of lines
2946 in a message, so we can give an accurate value for the original message, but we
2947 need some additional to handle added headers. (Double "." characters don't get
2948 included in the count.) */
2950 if ( message_size
> 0
2951 && sx
->peer_offered
& OPTION_SIZE
&& !(sx
->avoid_option
& OPTION_SIZE
))
2953 /*XXX problem here under spool_files_wireformat?
2954 Or just forget about lines? Or inflate by a fixed proportion? */
2956 sprintf(CS p
, " SIZE=%d", message_size
+message_linecount
+(SOB sx
->conn_args
.ob
)->size_addition
);
2960 #ifndef DISABLE_PRDR
2961 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2964 sx
->prdr_active
= FALSE
;
2965 if (sx
->peer_offered
& OPTION_PRDR
)
2966 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
2967 if (addr
->transport_return
== PENDING_DEFER
)
2969 for (addr
= addr
->next
; addr
; addr
= addr
->next
)
2970 if (addr
->transport_return
== PENDING_DEFER
)
2971 { /* at least two recipients to send */
2972 sx
->prdr_active
= TRUE
;
2973 sprintf(CS p
, " PRDR"); p
+= 5;
2981 /* If it supports internationalised messages, and this meesage need that,
2984 if ( sx
->peer_offered
& OPTION_UTF8
2985 && addrlist
->prop
.utf8_msg
2986 && !addrlist
->prop
.utf8_downcvt
2988 Ustrcpy(p
, US
" SMTPUTF8"), p
+= 9;
2991 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2992 for (sx
->dsn_all_lasthop
= TRUE
, addr
= addrlist
, address_count
= 0;
2993 addr
&& address_count
< sx
->max_rcpt
;
2994 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
2997 if (!(addr
->dsn_flags
& rf_dsnlasthop
))
2999 sx
->dsn_all_lasthop
= FALSE
;
3004 /* Add any DSN flags to the mail command */
3006 if (sx
->peer_offered
& OPTION_DSN
&& !sx
->dsn_all_lasthop
)
3008 if (dsn_ret
== dsn_ret_hdrs
)
3009 { Ustrcpy(p
, US
" RET=HDRS"); p
+= 9; }
3010 else if (dsn_ret
== dsn_ret_full
)
3011 { Ustrcpy(p
, US
" RET=FULL"); p
+= 9; }
3015 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ENVID=%s", dsn_envid
);
3020 /* If an authenticated_sender override has been specified for this transport
3021 instance, expand it. If the expansion is forced to fail, and there was already
3022 an authenticated_sender for this message, the original value will be used.
3023 Other expansion failures are serious. An empty result is ignored, but there is
3024 otherwise no check - this feature is expected to be used with LMTP and other
3025 cases where non-standard addresses (e.g. without domains) might be required. */
3027 if (smtp_mail_auth_str(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), addrlist
, sx
->conn_args
.ob
))
3035 build_rcptcmd_options(smtp_context
* sx
, const address_item
* addr
)
3037 uschar
* p
= sx
->buffer
;
3040 /* Add any DSN flags to the rcpt command */
3042 if (sx
->peer_offered
& OPTION_DSN
&& !(addr
->dsn_flags
& rf_dsnlasthop
))
3044 if (addr
->dsn_flags
& rf_dsnflags
)
3048 Ustrcpy(p
, US
" NOTIFY=");
3050 for (int i
= 0; i
< nelem(rf_list
); i
++) if (addr
->dsn_flags
& rf_list
[i
])
3052 if (!first
) *p
++ = ',';
3054 Ustrcpy(p
, rf_names
[i
]);
3059 if (addr
->dsn_orcpt
)
3061 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ORCPT=%s",
3072 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3073 -1 MAIL response error
3074 -2 any non-MAIL read i/o error
3075 -3 non-MAIL response timeout
3076 -4 internal error; channel still usable
3081 smtp_write_mail_and_rcpt_cmds(smtp_context
* sx
, int * yield
)
3083 address_item
* addr
;
3087 if (build_mailcmd_options(sx
, sx
->first_addr
) != OK
)
3093 /* From here until we send the DATA command, we can make use of PIPELINING
3094 if the server host supports it. The code has to be able to check the responses
3095 at any point, for when the buffer fills up, so we write it totally generally.
3096 When PIPELINING is off, each command written reports that it has flushed the
3099 sx
->pending_MAIL
= TRUE
; /* The block starts with MAIL */
3102 uschar
* s
= sx
->from_addr
;
3104 uschar
* errstr
= NULL
;
3106 /* If we must downconvert, do the from-address here. Remember we had to
3107 for the to-addresses (done below), and also (ugly) for re-doing when building
3108 the delivery log line. */
3110 if ( sx
->addrlist
->prop
.utf8_msg
3111 && (sx
->addrlist
->prop
.utf8_downcvt
|| !(sx
->peer_offered
& OPTION_UTF8
))
3114 if (s
= string_address_utf8_to_alabel(s
, &errstr
), errstr
)
3116 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, errstr
, DEFER
, FALSE
);
3120 setflag(sx
->addrlist
, af_utf8_downcvt
);
3124 rc
= smtp_write_command(sx
, pipelining_active
? SCMD_BUFFER
: SCMD_FLUSH
,
3125 "MAIL FROM:<%s>%s\r\n", s
, sx
->buffer
);
3128 mail_command
= string_copy(big_buffer
); /* Save for later error message */
3132 case -1: /* Transmission error */
3135 case +1: /* Cmd was sent */
3136 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3137 (SOB sx
->conn_args
.ob
)->command_timeout
))
3139 if (errno
== 0 && sx
->buffer
[0] == '4')
3141 errno
= ERRNO_MAIL4XX
;
3142 sx
->addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3146 sx
->pending_MAIL
= FALSE
;
3149 /* otherwise zero: command queued for pipeline */
3152 /* Pass over all the relevant recipient addresses for this host, which are the
3153 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3154 several before we have to read the responses for those seen so far. This
3155 checking is done by a subroutine because it also needs to be done at the end.
3156 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3157 the next one if not all are sent.
3159 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3160 last address because we want to abort if any recipients have any kind of
3161 problem, temporary or permanent. We know that all recipient addresses will have
3162 the PENDING_DEFER status, because only one attempt is ever made, and we know
3163 that max_rcpt will be large, so all addresses will be done at once.
3165 For verify we flush the pipeline after any (the only) rcpt address. */
3167 for (addr
= sx
->first_addr
, address_count
= 0;
3168 addr
&& address_count
< sx
->max_rcpt
;
3169 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
3175 addr
->dsn_aware
= sx
->peer_offered
& OPTION_DSN
3176 ? dsn_support_yes
: dsn_support_no
;
3179 no_flush
= pipelining_active
&& !sx
->verify
3180 && (!mua_wrapper
|| addr
->next
&& address_count
< sx
->max_rcpt
);
3182 build_rcptcmd_options(sx
, addr
);
3184 /* Now send the RCPT command, and process outstanding responses when
3185 necessary. After a timeout on RCPT, we just end the function, leaving the
3186 yield as OK, because this error can often mean that there is a problem with
3187 just one address, so we don't want to delay the host. */
3189 rcpt_addr
= transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
);
3192 if ( testflag(sx
->addrlist
, af_utf8_downcvt
)
3193 && !(rcpt_addr
= string_address_utf8_to_alabel(rcpt_addr
, NULL
))
3196 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3197 errno
= ERRNO_EXPANDFAIL
;
3198 return -5; /*XXX too harsh? */
3202 count
= smtp_write_command(sx
, no_flush
? SCMD_BUFFER
: SCMD_FLUSH
,
3203 "RCPT TO:<%s>%s%s\r\n", rcpt_addr
, sx
->igquotstr
, sx
->buffer
);
3205 if (count
< 0) return -5;
3208 switch(sync_responses(sx
, count
, 0))
3210 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3211 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3214 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3215 if (!sx
->lmtp
) /* can't tell about progress yet */
3216 sx
->completed_addr
= TRUE
;
3217 case 0: /* No 2xx or 5xx, but no probs */
3220 case -1: return -3; /* Timeout on RCPT */
3221 case -2: return -2; /* non-MAIL read i/o error */
3222 default: return -1; /* any MAIL error */
3224 #ifdef SUPPORT_PIPE_CONNECT
3225 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3226 case -5: return -1; /* TLS first-read error */
3229 sx
->pending_MAIL
= FALSE
; /* Dealt with MAIL */
3231 } /* Loop for next address */
3233 sx
->next_addr
= addr
;
3239 /*****************************************************
3240 * Proxy TLS connection for another transport process *
3241 ******************************************************/
3243 Close the unused end of the pipe, fork once more, then use the given buffer
3244 as a staging area, and select on both the given fd and the TLS'd client-fd for
3245 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3246 Do blocking full-size writes, and reads under a timeout. Once both input
3247 channels are closed, exit the process.
3251 buf space to use for buffering
3252 bufsiz size of buffer
3253 pfd pipe filedescriptor array; [0] is comms to proxied process
3254 timeout per-read timeout, seconds
3260 smtp_proxy_tls(void * ct_ctx
, uschar
* buf
, size_t bsize
, int * pfd
,
3264 int max_fd
= MAX(pfd
[0], tls_out
.active
.sock
) + 1;
3270 DEBUG(D_transport
) debug_printf("proxy-proc final-pid %d\n", rc
);
3271 _exit(rc
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
);
3274 testharness_pause_ms(100); /* let parent debug out */
3275 set_process_info("proxying TLS connection for continued transport");
3277 FD_SET(tls_out
.active
.sock
, &rfds
);
3278 FD_SET(pfd
[0], &rfds
);
3280 for (int fd_bits
= 3; fd_bits
; )
3282 time_t time_left
= timeout
;
3283 time_t time_start
= time(NULL
);
3289 struct timeval tv
= { time_left
, 0 };
3292 (SELECT_ARG2_TYPE
*)&rfds
, NULL
, (SELECT_ARG2_TYPE
*)&efds
, &tv
);
3294 if (rc
< 0 && errno
== EINTR
)
3295 if ((time_left
-= time(NULL
) - time_start
) > 0) continue;
3299 DEBUG(D_transport
) if (rc
== 0) debug_printf("%s: timed out\n", __FUNCTION__
);
3303 if (FD_ISSET(tls_out
.active
.sock
, &efds
) || FD_ISSET(pfd
[0], &efds
))
3305 DEBUG(D_transport
) debug_printf("select: exceptional cond on %s fd\n",
3306 FD_ISSET(pfd
[0], &efds
) ? "proxy" : "tls");
3310 while (rc
< 0 || !(FD_ISSET(tls_out
.active
.sock
, &rfds
) || FD_ISSET(pfd
[0], &rfds
)));
3312 /* handle inbound data */
3313 if (FD_ISSET(tls_out
.active
.sock
, &rfds
))
3314 if ((rc
= tls_read(ct_ctx
, buf
, bsize
)) <= 0)
3317 FD_CLR(tls_out
.active
.sock
, &rfds
);
3318 shutdown(pfd
[0], SHUT_WR
);
3323 for (int nbytes
= 0; rc
- nbytes
> 0; nbytes
+= i
)
3324 if ((i
= write(pfd
[0], buf
+ nbytes
, rc
- nbytes
)) < 0) goto done
;
3326 else if (fd_bits
& 1)
3327 FD_SET(tls_out
.active
.sock
, &rfds
);
3329 /* handle outbound data */
3330 if (FD_ISSET(pfd
[0], &rfds
))
3331 if ((rc
= read(pfd
[0], buf
, bsize
)) <= 0)
3334 tls_close(ct_ctx
, TLS_SHUTDOWN_NOWAIT
);
3339 for (int nbytes
= 0; rc
- nbytes
> 0; nbytes
+= i
)
3340 if ((i
= tls_write(ct_ctx
, buf
+ nbytes
, rc
- nbytes
, FALSE
)) < 0)
3343 else if (fd_bits
& 2)
3344 FD_SET(pfd
[0], &rfds
);
3348 testharness_pause_ms(100); /* let logging complete */
3349 exim_exit(0, US
"TLS proxy");
3354 /*************************************************
3355 * Deliver address list to given host *
3356 *************************************************/
3358 /* If continue_hostname is not null, we get here only when continuing to
3359 deliver down an existing channel. The channel was passed as the standard
3360 input. TLS is never active on a passed channel; the previous process always
3361 closes it down before passing the connection on.
3363 Otherwise, we have to make a connection to the remote host, and do the
3364 initial protocol exchange.
3366 When running as an MUA wrapper, if the sender or any recipient is rejected,
3367 temporarily or permanently, we force failure for all recipients.
3370 addrlist chain of potential addresses to deliver; only those whose
3371 transport_return field is set to PENDING_DEFER are currently
3372 being processed; others should be skipped - they have either
3373 been delivered to an earlier host or IP address, or been
3374 failed by one of them.
3375 host host to deliver to
3376 host_af AF_INET or AF_INET6
3377 defport default TCP/IP port to use if host does not specify, in host
3379 interface interface to bind to, or NULL
3380 tblock transport instance block
3381 message_defer set TRUE if yield is OK, but all addresses were deferred
3382 because of a non-recipient, non-host failure, that is, a
3383 4xx response to MAIL FROM, DATA, or ".". This is a defer
3384 that is specific to the message.
3385 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3386 a second attempt after TLS initialization fails
3388 Returns: OK - the connection was made and the delivery attempted;
3389 the result for each address is in its data block.
3390 DEFER - the connection could not be made, or something failed
3391 while setting up the SMTP session, or there was a
3392 non-message-specific error, such as a timeout.
3393 ERROR - a filter command is specified for this transport,
3394 and there was a problem setting it up; OR helo_data
3395 or add_headers or authenticated_sender is specified
3396 for this transport, and the string failed to expand
3400 smtp_deliver(address_item
*addrlist
, host_item
*host
, int host_af
, int defport
,
3401 uschar
*interface
, transport_instance
*tblock
,
3402 BOOL
*message_defer
, BOOL suppress_tls
)
3404 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
3408 struct timeval start_delivery_time
;
3410 BOOL pass_message
= FALSE
;
3411 uschar
*message
= NULL
;
3412 uschar new_message_id
[MESSAGE_ID_LENGTH
+ 1];
3414 smtp_context
* sx
= store_get(sizeof(*sx
), TRUE
); /* tainted, for the data buffers */
3416 gettimeofday(&start_delivery_time
, NULL
);
3417 suppress_tls
= suppress_tls
; /* stop compiler warning when no TLS support */
3418 *message_defer
= FALSE
;
3420 sx
->addrlist
= addrlist
;
3421 sx
->conn_args
.host
= host
;
3422 sx
->conn_args
.host_af
= host_af
,
3424 sx
->conn_args
.interface
= interface
;
3425 sx
->helo_data
= NULL
;
3426 sx
->conn_args
.tblock
= tblock
;
3428 sx
->sync_addr
= sx
->first_addr
= addrlist
;
3430 /* Get the channel set up ready for a message (MAIL FROM being the next
3431 SMTP command to send */
3433 if ((rc
= smtp_setup_conn(sx
, suppress_tls
)) != OK
)
3436 /* If there is a filter command specified for this transport, we can now
3437 set it up. This cannot be done until the identify of the host is known. */
3439 if (tblock
->filter_command
)
3441 transport_filter_timeout
= tblock
->filter_timeout
;
3443 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3446 if (!transport_set_up_command(&transport_filter_argv
,
3447 tblock
->filter_command
, TRUE
, DEFER
, addrlist
,
3448 string_sprintf("%.50s transport", tblock
->name
), NULL
))
3450 set_errno_nohost(addrlist
->next
, addrlist
->basic_errno
, addrlist
->message
, DEFER
,
3456 if ( transport_filter_argv
3457 && *transport_filter_argv
3458 && **transport_filter_argv
3459 && sx
->peer_offered
& OPTION_CHUNKING
3462 sx
->peer_offered
&= ~OPTION_CHUNKING
;
3463 DEBUG(D_transport
) debug_printf("CHUNKING not usable due to transport filter\n");
3467 /* For messages that have more than the maximum number of envelope recipients,
3468 we want to send several transactions down the same SMTP connection. (See
3469 comments in deliver.c as to how this reconciles, heuristically, with
3470 remote_max_parallel.) This optimization was added to Exim after the following
3471 code was already working. The simplest way to put it in without disturbing the
3472 code was to use a goto to jump back to this point when there is another
3473 transaction to handle. */
3476 sx
->from_addr
= return_path
;
3477 sx
->sync_addr
= sx
->first_addr
;
3479 sx
->send_rset
= TRUE
;
3480 sx
->completed_addr
= FALSE
;
3483 /* If we are a continued-connection-after-verify the MAIL and RCPT
3484 commands were already sent; do not re-send but do mark the addrs as
3485 having been accepted up to RCPT stage. A traditional cont-conn
3486 always has a sequence number greater than one. */
3488 if (continue_hostname
&& continue_sequence
== 1)
3490 sx
->peer_offered
= smtp_peer_options
;
3491 sx
->pending_MAIL
= FALSE
;
3493 sx
->next_addr
= NULL
;
3495 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
3496 addr
->transport_return
= PENDING_OK
;
3500 /* Initiate a message transfer. */
3502 switch(smtp_write_mail_and_rcpt_cmds(sx
, &yield
))
3505 case -1: case -2: goto RESPONSE_FAILED
;
3506 case -3: goto END_OFF
;
3507 case -4: goto SEND_QUIT
;
3508 default: goto SEND_FAILED
;
3511 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3512 permanently or temporarily. We should have flushed and synced after the last
3520 for (a
= sx
->first_addr
, cnt
= 0; a
&& cnt
< sx
->max_rcpt
; a
= a
->next
, cnt
++)
3521 if (a
->transport_return
!= PENDING_OK
)
3523 /*XXX could we find a better errno than 0 here? */
3524 set_errno_nohost(addrlist
, 0, a
->message
, FAIL
,
3525 testflag(a
, af_pass_message
));
3532 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3533 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3534 have a good recipient buffered up if we are pipelining. We don't want to waste
3535 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3536 are pipelining. The responses are all handled by sync_responses().
3537 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3540 if ( !(sx
->peer_offered
& OPTION_CHUNKING
)
3541 && (sx
->ok
|| (pipelining_active
&& !mua_wrapper
)))
3543 int count
= smtp_write_command(sx
, SCMD_FLUSH
, "DATA\r\n");
3545 if (count
< 0) goto SEND_FAILED
;
3546 switch(sync_responses(sx
, count
, sx
->ok
? +1 : -1))
3548 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3549 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3552 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3553 if (!sx
->lmtp
) sx
->completed_addr
= TRUE
; /* can't tell about progress yet */
3554 case 0: break; /* No 2xx or 5xx, but no probs */
3556 case -1: goto END_OFF
; /* Timeout on RCPT */
3558 #ifdef SUPPORT_PIPE_CONNECT
3559 case -5: /* TLS first-read error */
3560 case -4: HDEBUG(D_transport
)
3561 debug_printf("failed reaping pipelined cmd responses\n");
3563 default: goto RESPONSE_FAILED
; /* I/O error, or any MAIL/DATA error */
3565 pipelining_active
= FALSE
;
3566 data_command
= string_copy(big_buffer
); /* Save for later error message */
3569 /* If there were no good recipients (but otherwise there have been no
3570 problems), just set ok TRUE, since we have handled address-specific errors
3571 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3572 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3573 well as body. Set the appropriate timeout value to be used for each chunk.
3574 (Haven't been able to make it work using select() for writing yet.) */
3577 && (!(sx
->peer_offered
& OPTION_CHUNKING
) || !pipelining_active
))
3579 /* Save the first address of the next batch. */
3580 sx
->first_addr
= sx
->next_addr
;
3586 transport_ctx tctx
= {
3587 .u
= {.fd
= sx
->cctx
.sock
}, /*XXX will this need TLS info? */
3590 .check_string
= US
".",
3591 .escape_string
= US
"..", /* Escaping strings */
3593 topt_use_crlf
| topt_escape_headers
3594 | (tblock
->body_only
? topt_no_headers
: 0)
3595 | (tblock
->headers_only
? topt_no_body
: 0)
3596 | (tblock
->return_path_add
? topt_add_return_path
: 0)
3597 | (tblock
->delivery_date_add
? topt_add_delivery_date
: 0)
3598 | (tblock
->envelope_to_add
? topt_add_envelope_to
: 0)
3601 /* If using CHUNKING we need a callback from the generic transport
3602 support to us, for the sending of BDAT smtp commands and the reaping
3603 of responses. The callback needs a whole bunch of state so set up
3604 a transport-context structure to be passed around. */
3606 if (sx
->peer_offered
& OPTION_CHUNKING
)
3608 tctx
.check_string
= tctx
.escape_string
= NULL
;
3609 tctx
.options
|= topt_use_bdat
;
3610 tctx
.chunk_cb
= smtp_chunk_cmd_callback
;
3611 sx
->pending_BDAT
= FALSE
;
3612 sx
->good_RCPT
= sx
->ok
;
3614 tctx
.smtp_context
= sx
;
3617 tctx
.options
|= topt_end_dot
;
3619 /* Save the first address of the next batch. */
3620 sx
->first_addr
= sx
->next_addr
;
3622 /* Responses from CHUNKING commands go in buffer. Otherwise,
3623 there has not been a response. */
3627 sigalrm_seen
= FALSE
;
3628 transport_write_timeout
= ob
->data_timeout
;
3629 smtp_command
= US
"sending data block"; /* For error messages */
3630 DEBUG(D_transport
|D_v
)
3631 if (sx
->peer_offered
& OPTION_CHUNKING
)
3632 debug_printf(" will write message using CHUNKING\n");
3634 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3635 transport_count
= 0;
3637 #ifndef DISABLE_DKIM
3639 # ifdef MEASURE_TIMING
3641 gettimeofday(&t0
, NULL
);
3643 dkim_exim_sign_init();
3644 # ifdef EXPERIMENTAL_ARC
3646 uschar
* s
= ob
->arc_sign
;
3649 if (!(ob
->dkim
.arc_signspec
= s
= expand_string(s
)))
3651 if (!f
.expand_string_forcedfail
)
3653 message
= US
"failed to expand arc_sign";
3660 /* Ask dkim code to hash the body for ARC */
3661 (void) arc_ams_setup_sign_bodyhash();
3662 ob
->dkim
.force_bodyhash
= TRUE
;
3667 # ifdef MEASURE_TIMING
3668 report_time_since(&t0
, US
"dkim_exim_sign_init (delta)");
3671 sx
->ok
= dkim_transport_write_message(&tctx
, &ob
->dkim
, CUSS
&message
);
3673 sx
->ok
= transport_write_message(&tctx
, 0);
3676 /* transport_write_message() uses write() because it is called from other
3677 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3678 it can exit with "Broken pipe" as its error. This really means that the
3679 socket got closed at the far end. */
3681 transport_write_timeout
= 0; /* for subsequent transports */
3683 /* Failure can either be some kind of I/O disaster (including timeout),
3684 or the failure of a transport filter or the expansion of added headers.
3685 Or, when CHUNKING, it can be a protocol-detected failure. */
3688 if (message
) goto SEND_FAILED
;
3689 else goto RESPONSE_FAILED
;
3691 /* We used to send the terminating "." explicitly here, but because of
3692 buffering effects at both ends of TCP/IP connections, you don't gain
3693 anything by keeping it separate, so it might as well go in the final
3694 data buffer for efficiency. This is now done by setting the topt_end_dot
3697 smtp_command
= US
"end of data";
3699 if (sx
->peer_offered
& OPTION_CHUNKING
&& sx
->cmd_count
> 1)
3701 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3702 switch(sync_responses(sx
, sx
->cmd_count
-1, 0))
3704 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3705 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3708 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3709 if (!sx
->lmtp
) sx
->completed_addr
= TRUE
; /* can't tell about progress yet */
3710 case 0: break; /* No 2xx or 5xx, but no probs */
3712 case -1: goto END_OFF
; /* Timeout on RCPT */
3714 #ifdef SUPPORT_PIPE_CONNECT
3715 case -5: /* TLS first-read error */
3716 case -4: HDEBUG(D_transport
)
3717 debug_printf("failed reaping pipelined cmd responses\n");
3719 default: goto RESPONSE_FAILED
; /* I/O error, or any MAIL/DATA error */
3723 #ifndef DISABLE_PRDR
3724 /* For PRDR we optionally get a partial-responses warning followed by the
3725 individual responses, before going on with the overall response. If we don't
3726 get the warning then deal with per non-PRDR. */
3730 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '3', ob
->final_timeout
);
3731 if (!sx
->ok
&& errno
== 0) switch(sx
->buffer
[0])
3733 case '2': sx
->prdr_active
= FALSE
;
3736 case '4': errno
= ERRNO_DATA4XX
;
3737 addrlist
->more_errno
|=
3738 ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3745 /* For non-PRDR SMTP, we now read a single response that applies to the
3746 whole message. If it is OK, then all the addresses have been delivered. */
3750 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3752 if (!sx
->ok
&& errno
== 0 && sx
->buffer
[0] == '4')
3754 errno
= ERRNO_DATA4XX
;
3755 addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3759 /* For LMTP, we get back a response for every RCPT command that we sent;
3760 some may be accepted and some rejected. For those that get a response, their
3761 status is fixed; any that are accepted have been handed over, even if later
3762 responses crash - at least, that's how I read RFC 2033.
3764 If all went well, mark the recipient addresses as completed, record which
3765 host/IPaddress they were delivered to, and cut out RSET when sending another
3766 message down the same channel. Write the completed addresses to the journal
3767 now so that they are recorded in case there is a crash of hardware or
3768 software before the spool gets updated. Also record the final SMTP
3769 confirmation if needed (for SMTP only). */
3774 struct timeval delivery_time
;
3776 uschar
* conf
= NULL
;
3778 timesince(&delivery_time
, &start_delivery_time
);
3779 sx
->send_rset
= FALSE
;
3780 pipelining_active
= FALSE
;
3782 /* Set up confirmation if needed - applies only to SMTP */
3785 #ifdef DISABLE_EVENT
3786 LOGGING(smtp_confirmation
) &&
3791 const uschar
*s
= string_printing(sx
->buffer
);
3792 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3793 conf
= (s
== sx
->buffer
)? US
string_copy(s
) : US s
;
3796 /* Process all transported addresses - for LMTP or PRDR, read a status for
3799 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3801 if (addr
->transport_return
!= PENDING_OK
) continue;
3803 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3804 remaining addresses. Otherwise, it's a return code for just the one
3805 address. For temporary errors, add a retry item for the address so that
3806 it doesn't get tried again too soon. */
3808 #ifndef DISABLE_PRDR
3809 if (sx
->lmtp
|| sx
->prdr_active
)
3814 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3817 if (errno
!= 0 || sx
->buffer
[0] == 0) goto RESPONSE_FAILED
;
3818 addr
->message
= string_sprintf(
3819 #ifndef DISABLE_PRDR
3820 "%s error after %s: %s", sx
->prdr_active
? "PRDR":"LMTP",
3822 "LMTP error after %s: %s",
3824 data_command
, string_printing(sx
->buffer
));
3825 setflag(addr
, af_pass_message
); /* Allow message to go to user */
3826 if (sx
->buffer
[0] == '5')
3827 addr
->transport_return
= FAIL
;
3830 errno
= ERRNO_DATA4XX
;
3831 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3832 addr
->transport_return
= DEFER
;
3833 #ifndef DISABLE_PRDR
3834 if (!sx
->prdr_active
)
3836 retry_add_item(addr
, addr
->address_retry_key
, 0);
3840 sx
->completed_addr
= TRUE
; /* NOW we can set this flag */
3841 if (LOGGING(smtp_confirmation
))
3843 const uschar
*s
= string_printing(sx
->buffer
);
3844 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3845 conf
= (s
== sx
->buffer
) ? US
string_copy(s
) : US s
;
3849 /* SMTP, or success return from LMTP for this address. Pass back the
3850 actual host that was used. */
3852 addr
->transport_return
= OK
;
3853 addr
->more_errno
= delivery_time
.tv_sec
;
3854 addr
->delivery_usec
= delivery_time
.tv_usec
;
3855 addr
->host_used
= host
;
3856 addr
->special_action
= flag
;
3857 addr
->message
= conf
;
3859 if (tcp_out_fastopen
)
3861 setflag(addr
, af_tcp_fastopen_conn
);
3862 if (tcp_out_fastopen
>= TFO_USED_NODATA
) setflag(addr
, af_tcp_fastopen
);
3863 if (tcp_out_fastopen
>= TFO_USED_DATA
) setflag(addr
, af_tcp_fastopen_data
);
3865 if (sx
->pipelining_used
) setflag(addr
, af_pipelining
);
3866 #ifdef SUPPORT_PIPE_CONNECT
3867 if (sx
->early_pipe_active
) setflag(addr
, af_early_pipe
);
3869 #ifndef DISABLE_PRDR
3870 if (sx
->prdr_active
) setflag(addr
, af_prdr_used
);
3872 if (sx
->peer_offered
& OPTION_CHUNKING
) setflag(addr
, af_chunking_used
);
3875 #ifndef DISABLE_PRDR
3876 if (!sx
->prdr_active
)
3879 /* Update the journal. For homonymic addresses, use the base address plus
3880 the transport name. See lots of comments in deliver.c about the reasons
3881 for the complications when homonyms are involved. Just carry on after
3882 write error, as it may prove possible to update the spool file later. */
3884 if (testflag(addr
, af_homonym
))
3885 sprintf(CS sx
->buffer
, "%.500s/%s\n", addr
->unique
+ 3, tblock
->name
);
3887 sprintf(CS sx
->buffer
, "%.500s\n", addr
->unique
);
3889 DEBUG(D_deliver
) debug_printf("S:journalling %s\n", sx
->buffer
);
3890 len
= Ustrlen(CS sx
->buffer
);
3891 if (write(journal_fd
, sx
->buffer
, len
) != len
)
3892 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to write journal for "
3893 "%s: %s", sx
->buffer
, strerror(errno
));
3897 #ifndef DISABLE_PRDR
3898 if (sx
->prdr_active
)
3900 const uschar
* overall_message
;
3902 /* PRDR - get the final, overall response. For any non-success
3903 upgrade all the address statuses. */
3905 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3909 if(errno
== 0 && sx
->buffer
[0] == '4')
3911 errno
= ERRNO_DATA4XX
;
3912 addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3914 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3915 if (sx
->buffer
[0] == '5' || addr
->transport_return
== OK
)
3916 addr
->transport_return
= PENDING_OK
; /* allow set_errno action */
3917 goto RESPONSE_FAILED
;
3920 /* Append the overall response to the individual PRDR response for logging
3921 and update the journal, or setup retry. */
3923 overall_message
= string_printing(sx
->buffer
);
3924 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3925 if (addr
->transport_return
== OK
)
3926 addr
->message
= string_sprintf("%s\\n%s", addr
->message
, overall_message
);
3928 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3929 if (addr
->transport_return
== OK
)
3931 if (testflag(addr
, af_homonym
))
3932 sprintf(CS sx
->buffer
, "%.500s/%s\n", addr
->unique
+ 3, tblock
->name
);
3934 sprintf(CS sx
->buffer
, "%.500s\n", addr
->unique
);
3936 DEBUG(D_deliver
) debug_printf("journalling(PRDR) %s\n", sx
->buffer
);
3937 len
= Ustrlen(CS sx
->buffer
);
3938 if (write(journal_fd
, sx
->buffer
, len
) != len
)
3939 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to write journal for "
3940 "%s: %s", sx
->buffer
, strerror(errno
));
3942 else if (addr
->transport_return
== DEFER
)
3943 retry_add_item(addr
, addr
->address_retry_key
, -2);
3947 /* Ensure the journal file is pushed out to disk. */
3949 if (EXIMfsync(journal_fd
) < 0)
3950 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to fsync journal: %s",
3956 /* Handle general (not specific to one address) failures here. The value of ok
3957 is used to skip over this code on the falling through case. A timeout causes a
3958 deferral. Other errors may defer or fail according to the response code, and
3959 may set up a special errno value, e.g. after connection chopped, which is
3960 assumed if errno == 0 and there is no text in the buffer. If control reaches
3961 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3962 the problem is not related to this specific message. */
3967 uschar
* set_message
;
3973 sx
->send_quit
= check_response(host
, &save_errno
, addrlist
->more_errno
,
3974 sx
->buffer
, &code
, &message
, &pass_message
);
3982 message
= string_sprintf("send() to %s [%s] failed: %s",
3983 host
->name
, host
->address
, message
? message
: US
strerror(save_errno
));
3984 sx
->send_quit
= FALSE
;
3992 sx
->ok
= FALSE
; /* For when reached by GOTO */
3993 set_message
= message
;
3995 /* We want to handle timeouts after MAIL or "." and loss of connection after
3996 "." specially. They can indicate a problem with the sender address or with
3997 the contents of the message rather than a real error on the connection. These
3998 cases are treated in the same way as a 4xx response. This next bit of code
3999 does the classification. */
4006 message_error
= TRUE
;
4010 message_error
= Ustrncmp(smtp_command
,"MAIL",4) == 0 ||
4011 Ustrncmp(smtp_command
,"end ",4) == 0;
4014 case ERRNO_SMTPCLOSED
:
4015 message_error
= Ustrncmp(smtp_command
,"end ",4) == 0;
4019 message_error
= FALSE
;
4023 /* Handle the cases that are treated as message errors. These are:
4025 (a) negative response or timeout after MAIL
4026 (b) negative response after DATA
4027 (c) negative response or timeout or dropped connection after "."
4028 (d) utf8 support required and not offered
4030 It won't be a negative response or timeout after RCPT, as that is dealt
4031 with separately above. The action in all cases is to set an appropriate
4032 error code for all the addresses, but to leave yield set to OK because the
4033 host itself has not failed. Of course, it might in practice have failed
4034 when we've had a timeout, but if so, we'll discover that at the next
4035 delivery attempt. For a temporary error, set the message_defer flag, and
4036 write to the logs for information if this is not the last host. The error
4037 for the last host will be logged as part of the address's log line. */
4041 if (mua_wrapper
) code
= '5'; /* Force hard failure in wrapper mode */
4043 /* If there's an errno, the message contains just the identity of
4048 else /* Anything other than 5 is treated as temporary */
4052 message
= US
string_sprintf("%s: %s", message
, strerror(save_errno
));
4054 write_logs(host
, message
, sx
->first_addr
? sx
->first_addr
->basic_errno
: 0);
4056 *message_defer
= TRUE
;
4060 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4061 ".", or some other transportation error. We defer all addresses and yield
4062 DEFER, except for the case of failed add_headers expansion, or a transport
4063 filter failure, when the yield should be ERROR, to stop it trying other
4068 #ifdef SUPPORT_PIPE_CONNECT
4069 /* If we were early-pipelinng and the actual EHLO response did not match
4070 the cached value we assumed, we could have detected it and passed a
4071 custom errno through to here. It would be nice to RSET and retry right
4072 away, but to reliably do that we eould need an extra synch point before
4073 we committed to data and that would discard half the gained roundrips.
4074 Or we could summarily drop the TCP connection. but that is also ugly.
4075 Instead, we ignore the possibility (having freshened the cache) and rely
4076 on the server telling us with a nonmessage error if we have tried to
4077 do something it no longer supports. */
4080 yield
= (save_errno
== ERRNO_CHHEADER_FAIL
||
4081 save_errno
== ERRNO_FILTER_FAIL
) ? ERROR
: DEFER
;
4085 set_errno(addrlist
, save_errno
, set_message
, set_rc
, pass_message
, host
4086 #ifdef EXPERIMENTAL_DSN_INFO
4087 , sx
->smtp_greeting
, sx
->helo_response
4093 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4094 SMTP session tidily. However, if there were too many addresses to send in one
4095 message (indicated by first_addr being non-NULL) we want to carry on with the
4096 rest of them. Also, it is desirable to send more than one message down the SMTP
4097 connection if there are several waiting, provided we haven't already sent so
4098 many as to hit the configured limit. The function transport_check_waiting looks
4099 for a waiting message and returns its id. Then transport_pass_socket tries to
4100 set up a continued delivery by passing the socket on to another process. The
4101 variable send_rset is FALSE if a message has just been successfully transferred.
4103 If we are already sending down a continued channel, there may be further
4104 addresses not yet delivered that are aimed at the same host, but which have not
4105 been passed in this run of the transport. In this case, continue_more will be
4106 true, and all we should do is send RSET if necessary, and return, leaving the
4109 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4110 do not want to continue with other messages down the same channel, because that
4111 can lead to looping between two or more messages, all with the same,
4112 temporarily failing address(es). [The retry information isn't updated yet, so
4113 new processes keep on trying.] We probably also don't want to try more of this
4114 message's addresses either.
4116 If we have started a TLS session, we have to end it before passing the
4117 connection to a new process. However, not all servers can handle this (Exim
4118 can), so we do not pass such a connection on if the host matches
4119 hosts_nopass_tls. */
4122 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4123 "yield=%d first_address is %sNULL\n", sx
->ok
, sx
->send_quit
,
4124 sx
->send_rset
, f
.continue_more
, yield
, sx
->first_addr
? "not " : "");
4126 if (sx
->completed_addr
&& sx
->ok
&& sx
->send_quit
)
4129 smtp_compare_t t_compare
;
4131 t_compare
.tblock
= tblock
;
4132 t_compare
.current_sender_address
= sender_address
;
4134 if ( sx
->first_addr
!= NULL
4138 ( tls_out
.active
.sock
< 0 && !continue_proxy_cipher
4139 || verify_check_given_host(CUSS
&ob
->hosts_nopass_tls
, host
) != OK
4143 transport_check_waiting(tblock
->name
, host
->name
,
4144 tblock
->connection_max_messages
, new_message_id
, &more
,
4145 (oicf
)smtp_are_same_identities
, (void*)&t_compare
)
4152 if (! (sx
->ok
= smtp_write_command(sx
, SCMD_FLUSH
, "RSET\r\n") >= 0))
4154 msg
= US
string_sprintf("send() to %s [%s] failed: %s", host
->name
,
4155 host
->address
, strerror(errno
));
4156 sx
->send_quit
= FALSE
;
4158 else if (! (sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
4159 '2', ob
->command_timeout
)))
4162 sx
->send_quit
= check_response(host
, &errno
, 0, sx
->buffer
, &code
, &msg
,
4166 DEBUG(D_transport
) debug_printf("H=%s [%s] %s\n",
4167 host
->name
, host
->address
, msg
);
4171 /* Either RSET was not needed, or it succeeded */
4178 int socket_fd
= sx
->cctx
.sock
;
4181 if (sx
->first_addr
!= NULL
) /* More addresses still to be sent */
4182 { /* in this run of the transport */
4183 continue_sequence
++; /* Causes * in logging */
4187 /* Unless caller said it already has more messages listed for this host,
4188 pass the connection on to a new Exim process (below, the call to
4189 transport_pass_socket). If the caller has more ready, just return with
4190 the connection still open. */
4193 if (tls_out
.active
.sock
>= 0)
4194 if ( f
.continue_more
4195 || verify_check_given_host(CUSS
&ob
->hosts_noproxy_tls
, host
) == OK
)
4197 /* Before passing the socket on, or returning to caller with it still
4198 open, we must shut down TLS. Not all MTAs allow for the continuation
4199 of the SMTP session when TLS is shut down. We test for this by sending
4200 a new EHLO. If we don't get a good response, we don't attempt to pass
4203 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_WAIT
);
4204 sx
->cctx
.tls_ctx
= NULL
;
4205 smtp_peer_options
= smtp_peer_options_wrap
;
4207 && smtp_write_command(sx
, SCMD_FLUSH
, "EHLO %s\r\n", sx
->helo_data
)
4209 && smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
4210 '2', ob
->command_timeout
);
4212 if (sx
->ok
&& f
.continue_more
)
4213 return yield
; /* More addresses for another run */
4217 /* Set up a pipe for proxying TLS for the new transport process */
4219 smtp_peer_options
|= OPTION_TLS
;
4220 if ((sx
->ok
= socketpair(AF_UNIX
, SOCK_STREAM
, 0, pfd
) == 0))
4223 set_errno(sx
->first_addr
, errno
, US
"internal allocation problem",
4225 # ifdef EXPERIMENTAL_DSN_INFO
4226 , sx
->smtp_greeting
, sx
->helo_response
4232 if (f
.continue_more
)
4233 return yield
; /* More addresses for another run */
4235 /* If the socket is successfully passed, we mustn't send QUIT (or
4236 indeed anything!) from here. */
4238 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4239 propagate it from the initial
4241 if (sx
->ok
&& transport_pass_socket(tblock
->name
, host
->name
,
4242 host
->address
, new_message_id
, socket_fd
))
4244 sx
->send_quit
= FALSE
;
4246 /* We have passed the client socket to a fresh transport process.
4247 If TLS is still active, we need to proxy it for the transport we
4248 just passed the baton to. Fork a child to to do it, and return to
4249 get logging done asap. Which way to place the work makes assumptions
4250 about post-fork prioritisation which may not hold on all platforms. */
4252 if (tls_out
.active
.sock
>= 0)
4255 if (pid
== 0) /* child; fork again to disconnect totally */
4257 testharness_pause_ms(100); /* let parent debug out */
4258 /* does not return */
4259 smtp_proxy_tls(sx
->cctx
.tls_ctx
, sx
->buffer
, sizeof(sx
->buffer
), pfd
,
4260 ob
->command_timeout
);
4263 if (pid
> 0) /* parent */
4265 DEBUG(D_transport
) debug_printf("proxy-proc inter-pid %d\n", pid
);
4267 /* tidy the inter-proc to disconn the proxy proc */
4268 waitpid(pid
, NULL
, 0);
4269 tls_close(sx
->cctx
.tls_ctx
, TLS_NO_SHUTDOWN
);
4270 sx
->cctx
.tls_ctx
= NULL
;
4271 (void)close(sx
->cctx
.sock
);
4273 continue_transport
= NULL
;
4274 continue_hostname
= NULL
;
4277 log_write(0, LOG_PANIC_DIE
, "fork failed");
4283 /* If RSET failed and there are addresses left, they get deferred. */
4285 set_errno(sx
->first_addr
, errno
, msg
, DEFER
, FALSE
, host
4286 #ifdef EXPERIMENTAL_DSN_INFO
4287 , sx
->smtp_greeting
, sx
->helo_response
4293 /* End off tidily with QUIT unless the connection has died or the socket has
4294 been passed to another process. There has been discussion on the net about what
4295 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4296 to wait for a response, but on the other hand, there isn't anything one can do
4297 with an error response, other than log it. Exim used to do that. However,
4298 further discussion suggested that it is positively advantageous not to wait for
4299 the response, but to close the session immediately. This is supposed to move
4300 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4301 load from the server. (Hosts that are both servers and clients may not see much
4302 difference, of course.) Further discussion indicated that this was safe to do
4303 on Unix systems which have decent implementations of TCP/IP that leave the
4304 connection around for a while (TIME_WAIT) after the application has gone away.
4305 This enables the response sent by the server to be properly ACKed rather than
4306 timed out, as can happen on broken TCP/IP implementations on other OS.
4308 This change is being made on 31-Jul-98. After over a year of trouble-free
4309 operation, the old commented-out code was removed on 17-Sep-99. */
4313 (void) setsockopt(sx
->cctx
.sock
, IPPROTO_TCP
, TCP_CORK
, US
&on
, sizeof(on
));
4315 if (sx
->send_quit
) (void)smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n");
4320 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
4321 sx
->cctx
.tls_ctx
= NULL
;
4324 /* Close the socket, and return the appropriate value, first setting
4325 works because the NULL setting is passed back to the calling process, and
4326 remote_max_parallel is forced to 1 when delivering over an existing connection,
4328 If all went well and continue_more is set, we shouldn't actually get here if
4329 there are further addresses, as the return above will be taken. However,
4330 writing RSET might have failed, or there may be other addresses whose hosts are
4331 specified in the transports, and therefore not visible at top level, in which
4332 case continue_more won't get set. */
4334 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
4337 shutdown(sx
->cctx
.sock
, SHUT_WR
);
4339 testharness_pause_ms(200);
4340 if (fcntl(sx
->cctx
.sock
, F_SETFL
, O_NONBLOCK
) == 0)
4341 for (int i
= 16; read(sx
->cctx
.sock
, sx
->inbuffer
, sizeof(sx
->inbuffer
)) > 0 && i
> 0;)
4342 i
--; /* drain socket */
4344 (void)close(sx
->cctx
.sock
);
4346 #ifndef DISABLE_EVENT
4347 (void) event_raise(tblock
->event_action
, US
"tcp:close", NULL
);
4350 continue_transport
= NULL
;
4351 continue_hostname
= NULL
;
4358 /*************************************************
4359 * Closedown entry point *
4360 *************************************************/
4362 /* This function is called when exim is passed an open smtp channel
4363 from another incarnation, but the message which it has been asked
4364 to deliver no longer exists. The channel is on stdin.
4366 We might do fancy things like looking for another message to send down
4367 the channel, but if the one we sought has gone, it has probably been
4368 delivered by some other process that itself will seek further messages,
4369 so just close down our connection.
4371 Argument: pointer to the transport instance block
4376 smtp_transport_closedown(transport_instance
*tblock
)
4378 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
4379 client_conn_ctx cctx
;
4382 uschar inbuffer
[4096];
4383 uschar outbuffer
[16];
4385 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4386 cctx
.sock
= fileno(stdin
);
4387 cctx
.tls_ctx
= cctx
.sock
== tls_out
.active
.sock
? tls_out
.active
.tls_ctx
: NULL
;
4389 sx
.inblock
.cctx
= &cctx
;
4390 sx
.inblock
.buffer
= inbuffer
;
4391 sx
.inblock
.buffersize
= sizeof(inbuffer
);
4392 sx
.inblock
.ptr
= inbuffer
;
4393 sx
.inblock
.ptrend
= inbuffer
;
4395 sx
.outblock
.cctx
= &cctx
;
4396 sx
.outblock
.buffersize
= sizeof(outbuffer
);
4397 sx
.outblock
.buffer
= outbuffer
;
4398 sx
.outblock
.ptr
= outbuffer
;
4399 sx
.outblock
.cmd_count
= 0;
4400 sx
.outblock
.authenticating
= FALSE
;
4402 (void)smtp_write_command(&sx
, SCMD_FLUSH
, "QUIT\r\n");
4403 (void)smtp_read_response(&sx
, buffer
, sizeof(buffer
), '2', ob
->command_timeout
);
4404 (void)close(cctx
.sock
);
4409 /*************************************************
4410 * Prepare addresses for delivery *
4411 *************************************************/
4413 /* This function is called to flush out error settings from previous delivery
4414 attempts to other hosts. It also records whether we got here via an MX record
4415 or not in the more_errno field of the address. We are interested only in
4416 addresses that are still marked DEFER - others may have got delivered to a
4417 previously considered IP address. Set their status to PENDING_DEFER to indicate
4418 which ones are relevant this time.
4421 addrlist the list of addresses
4422 host the host we are delivering to
4424 Returns: the first address for this delivery
4427 static address_item
*
4428 prepare_addresses(address_item
*addrlist
, host_item
*host
)
4430 address_item
*first_addr
= NULL
;
4431 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4432 if (addr
->transport_return
== DEFER
)
4434 if (!first_addr
) first_addr
= addr
;
4435 addr
->transport_return
= PENDING_DEFER
;
4436 addr
->basic_errno
= 0;
4437 addr
->more_errno
= (host
->mx
>= 0)? 'M' : 'A';
4438 addr
->message
= NULL
;
4440 addr
->cipher
= NULL
;
4441 addr
->ourcert
= NULL
;
4442 addr
->peercert
= NULL
;
4443 addr
->peerdn
= NULL
;
4444 addr
->ocsp
= OCSP_NOT_REQ
;
4445 addr
->tlsver
= NULL
;
4447 #ifdef EXPERIMENTAL_DSN_INFO
4448 addr
->smtp_greeting
= NULL
;
4449 addr
->helo_response
= NULL
;
4457 /*************************************************
4458 * Main entry point *
4459 *************************************************/
4461 /* See local README for interface details. As this is a remote transport, it is
4462 given a chain of addresses to be delivered in one connection, if possible. It
4463 always returns TRUE, indicating that each address has its own independent
4464 status set, except if there is a setting up problem, in which case it returns
4468 smtp_transport_entry(
4469 transport_instance
*tblock
, /* data for this instantiation */
4470 address_item
*addrlist
) /* addresses we are working on */
4473 int hosts_defer
= 0;
4475 int hosts_looked_up
= 0;
4476 int hosts_retry
= 0;
4477 int hosts_serial
= 0;
4478 int hosts_total
= 0;
4479 int total_hosts_tried
= 0;
4480 BOOL expired
= TRUE
;
4481 uschar
*expanded_hosts
= NULL
;
4483 uschar
*tid
= string_sprintf("%s transport", tblock
->name
);
4484 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
4485 host_item
*hostlist
= addrlist
->host_list
;
4486 host_item
*host
= NULL
;
4490 debug_printf("%s transport entered\n", tblock
->name
);
4491 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4492 debug_printf(" %s\n", addr
->address
);
4495 debug_printf("hostlist:\n");
4496 for (host_item
* host
= hostlist
; host
; host
= host
->next
)
4497 debug_printf(" '%s' IP %s port %d\n", host
->name
, host
->address
, host
->port
);
4499 if (continue_hostname
)
4500 debug_printf("already connected to %s [%s] (on fd %d)\n",
4501 continue_hostname
, continue_host_address
,
4502 cutthrough
.cctx
.sock
>= 0 ? cutthrough
.cctx
.sock
: 0);
4505 /* Set the flag requesting that these hosts be added to the waiting
4506 database if the delivery fails temporarily or if we are running with
4507 queue_smtp or a 2-stage queue run. This gets unset for certain
4508 kinds of error, typically those that are specific to the message. */
4510 update_waiting
= TRUE
;
4512 /* If a host list is not defined for the addresses - they must all have the
4513 same one in order to be passed to a single transport - or if the transport has
4514 a host list with hosts_override set, use the host list supplied with the
4515 transport. It is an error for this not to exist. */
4517 if (!hostlist
|| (ob
->hosts_override
&& ob
->hosts
))
4521 addrlist
->message
= string_sprintf("%s transport called with no hosts set",
4523 addrlist
->transport_return
= PANIC
;
4524 return FALSE
; /* Only top address has status */
4527 DEBUG(D_transport
) debug_printf("using the transport's hosts: %s\n",
4530 /* If the transport's host list contains no '$' characters, and we are not
4531 randomizing, it is fixed and therefore a chain of hosts can be built once
4532 and for all, and remembered for subsequent use by other calls to this
4533 transport. If, on the other hand, the host list does contain '$', or we are
4534 randomizing its order, we have to rebuild it each time. In the fixed case,
4535 as the hosts string will never be used again, it doesn't matter that we
4536 replace all the : characters with zeros. */
4540 uschar
*s
= ob
->hosts
;
4542 if (Ustrchr(s
, '$') != NULL
)
4544 if (!(expanded_hosts
= expand_string(s
)))
4546 addrlist
->message
= string_sprintf("failed to expand list of hosts "
4547 "\"%s\" in %s transport: %s", s
, tblock
->name
, expand_string_message
);
4548 addrlist
->transport_return
= f
.search_find_defer
? DEFER
: PANIC
;
4549 return FALSE
; /* Only top address has status */
4551 DEBUG(D_transport
) debug_printf("expanded list of hosts \"%s\" to "
4552 "\"%s\"\n", s
, expanded_hosts
);
4556 if (ob
->hosts_randomize
) s
= expanded_hosts
= string_copy(s
);
4560 log_write(0, LOG_MAIN
|LOG_PANIC
,
4561 "attempt to use tainted host list '%s' from '%s' in transport %s",
4562 s
, ob
->hosts
, tblock
->name
);
4563 /* Avoid leaking info to an attacker */
4564 addrlist
->message
= US
"internal configuration error";
4565 addrlist
->transport_return
= PANIC
;
4569 host_build_hostlist(&hostlist
, s
, ob
->hosts_randomize
);
4571 /* Check that the expansion yielded something useful. */
4575 string_sprintf("%s transport has empty hosts setting", tblock
->name
);
4576 addrlist
->transport_return
= PANIC
;
4577 return FALSE
; /* Only top address has status */
4580 /* If there was no expansion of hosts, save the host list for
4583 if (!expanded_hosts
) ob
->hostlist
= hostlist
;
4586 /* This is not the first time this transport has been run in this delivery;
4587 the host list was built previously. */
4590 hostlist
= ob
->hostlist
;
4593 /* The host list was supplied with the address. If hosts_randomize is set, we
4594 must sort it into a random order if it did not come from MX records and has not
4595 already been randomized (but don't bother if continuing down an existing
4598 else if (ob
->hosts_randomize
&& hostlist
->mx
== MX_NONE
&& !continue_hostname
)
4600 host_item
*newlist
= NULL
;
4603 host_item
*h
= hostlist
;
4604 hostlist
= hostlist
->next
;
4606 h
->sort_key
= random_number(100);
4613 else if (h
->sort_key
< newlist
->sort_key
)
4620 host_item
*hh
= newlist
;
4623 if (h
->sort_key
< hh
->next
->sort_key
) break;
4631 hostlist
= addrlist
->host_list
= newlist
;
4634 /* Sort out the default port. */
4636 if (!smtp_get_port(ob
->port
, addrlist
, &defport
, tid
)) return FALSE
;
4638 /* For each host-plus-IP-address on the list:
4640 . If this is a continued delivery and the host isn't the one with the
4641 current connection, skip.
4643 . If the status is unusable (i.e. previously failed or retry checked), skip.
4645 . If no IP address set, get the address, either by turning the name into
4646 an address, calling gethostbyname if gethostbyname is on, or by calling
4647 the DNS. The DNS may yield multiple addresses, in which case insert the
4648 extra ones into the list.
4650 . Get the retry data if not previously obtained for this address and set the
4651 field which remembers the state of this address. Skip if the retry time is
4652 not reached. If not, remember whether retry data was found. The retry string
4653 contains both the name and the IP address.
4655 . Scan the list of addresses and mark those whose status is DEFER as
4656 PENDING_DEFER. These are the only ones that will be processed in this cycle
4659 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4660 Some addresses may be successfully delivered, others may fail, and yet
4661 others may get temporary errors and so get marked DEFER.
4663 . The return from the delivery attempt is OK if a connection was made and a
4664 valid SMTP dialogue was completed. Otherwise it is DEFER.
4666 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4668 . If fail to connect, or other defer state, add a retry item.
4670 . If there are any addresses whose status is still DEFER, carry on to the
4671 next host/IPaddress, unless we have tried the number of hosts given
4672 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4673 there is some fancy logic for hosts_max_try that means its limit can be
4674 overstepped in some circumstances.
4676 If we get to the end of the list, all hosts have deferred at least one address,
4677 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4678 delivery attempt to those hosts whose last try was before the arrival time of
4679 the current message. To cope with this, we have to go round the loop a second
4680 time. After that, set the status and error data for any addresses that haven't
4681 had it set already. */
4683 for (int cutoff_retry
= 0;
4684 expired
&& cutoff_retry
< (ob
->delay_after_cutoff
? 1 : 2);
4687 host_item
*nexthost
= NULL
;
4688 int unexpired_hosts_tried
= 0;
4689 BOOL continue_host_tried
= FALSE
;
4691 retry_non_continued
:
4692 for (host
= hostlist
;
4694 && unexpired_hosts_tried
< ob
->hosts_max_try
4695 && total_hosts_tried
< ob
->hosts_max_try_hardlimit
;
4700 BOOL host_is_expired
= FALSE
;
4701 BOOL message_defer
= FALSE
;
4702 BOOL some_deferred
= FALSE
;
4703 address_item
*first_addr
= NULL
;
4704 uschar
*interface
= NULL
;
4705 uschar
*retry_host_key
= NULL
;
4706 uschar
*retry_message_key
= NULL
;
4707 uschar
*serialize_key
= NULL
;
4709 /* Default next host is next host. :-) But this can vary if the
4710 hosts_max_try limit is hit (see below). It may also be reset if a host
4711 address is looked up here (in case the host was multihomed). */
4713 nexthost
= host
->next
;
4715 /* If the address hasn't yet been obtained from the host name, look it up
4716 now, unless the host is already marked as unusable. If it is marked as
4717 unusable, it means that the router was unable to find its IP address (in
4718 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4719 the lookup failed last time. We don't get this far if *all* MX records
4720 point to non-existent hosts; that is treated as a hard error.
4722 We can just skip this host entirely. When the hosts came from the router,
4723 the address will timeout based on the other host(s); when the address is
4724 looked up below, there is an explicit retry record added.
4726 Note that we mustn't skip unusable hosts if the address is not unset; they
4727 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4731 int new_port
, flags
;
4733 if (host
->status
>= hstatus_unusable
)
4735 DEBUG(D_transport
) debug_printf("%s has no address and is unusable - skipping\n",
4740 DEBUG(D_transport
) debug_printf("getting address for %s\n", host
->name
);
4742 /* The host name is permitted to have an attached port. Find it, and
4743 strip it from the name. Just remember it for now. */
4745 new_port
= host_item_get_port(host
);
4747 /* Count hosts looked up */
4751 /* Find by name if so configured, or if it's an IP address. We don't
4752 just copy the IP address, because we need the test-for-local to happen. */
4754 flags
= HOST_FIND_BY_A
| HOST_FIND_BY_AAAA
;
4755 if (ob
->dns_qualify_single
) flags
|= HOST_FIND_QUALIFY_SINGLE
;
4756 if (ob
->dns_search_parents
) flags
|= HOST_FIND_SEARCH_PARENTS
;
4758 if (ob
->gethostbyname
|| string_is_ip_address(host
->name
, NULL
) != 0)
4759 rc
= host_find_byname(host
, NULL
, flags
, NULL
, TRUE
);
4761 rc
= host_find_bydns(host
, NULL
, flags
, NULL
, NULL
, NULL
,
4762 &ob
->dnssec
, /* domains for request/require */
4765 /* Update the host (and any additional blocks, resulting from
4766 multihoming) with a host-specific port, if any. */
4768 for (host_item
* hh
= host
; hh
!= nexthost
; hh
= hh
->next
) hh
->port
= new_port
;
4770 /* Failure to find the host at this time (usually DNS temporary failure)
4771 is really a kind of routing failure rather than a transport failure.
4772 Therefore we add a retry item of the routing kind, not to stop us trying
4773 to look this name up here again, but to ensure the address gets timed
4774 out if the failures go on long enough. A complete failure at this point
4775 commonly points to a configuration error, but the best action is still
4776 to carry on for the next host. */
4778 if (rc
== HOST_FIND_AGAIN
|| rc
== HOST_FIND_SECURITY
|| rc
== HOST_FIND_FAILED
)
4780 retry_add_item(addrlist
, string_sprintf("R:%s", host
->name
), 0);
4782 if (rc
== HOST_FIND_AGAIN
) hosts_defer
++; else hosts_fail
++;
4783 DEBUG(D_transport
) debug_printf("rc = %s for %s\n", (rc
== HOST_FIND_AGAIN
)?
4784 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host
->name
);
4785 host
->status
= hstatus_unusable
;
4787 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4789 if (addr
->transport_return
!= DEFER
) continue;
4790 addr
->basic_errno
= ERRNO_UNKNOWNHOST
;
4791 addr
->message
= string_sprintf(
4792 rc
== HOST_FIND_SECURITY
4793 ? "lookup of IP address for %s was insecure"
4794 : "failed to lookup IP address for %s",
4800 /* If the host is actually the local host, we may have a problem, or
4801 there may be some cunning configuration going on. In the problem case,
4802 log things and give up. The default transport status is already DEFER. */
4804 if (rc
== HOST_FOUND_LOCAL
&& !ob
->allow_localhost
)
4806 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4808 addr
->basic_errno
= 0;
4809 addr
->message
= string_sprintf("%s transport found host %s to be "
4810 "local", tblock
->name
, host
->name
);
4814 } /* End of block for IP address lookup */
4816 /* If this is a continued delivery, we are interested only in the host
4817 which matches the name of the existing open channel. The check is put
4818 here after the local host lookup, in case the name gets expanded as a
4819 result of the lookup. Set expired FALSE, to save the outer loop executing
4822 if (continue_hostname
)
4823 if ( Ustrcmp(continue_hostname
, host
->name
) != 0
4824 || Ustrcmp(continue_host_address
, host
->address
) != 0
4828 continue; /* With next host */
4831 continue_host_tried
= TRUE
;
4833 /* Reset the default next host in case a multihomed host whose addresses
4834 are not looked up till just above added to the host list. */
4836 nexthost
= host
->next
;
4838 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4839 domain is in queue_smtp_domains, we don't actually want to attempt any
4840 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4841 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4842 were not in it. We don't want to hold up all SMTP deliveries! Except when
4843 doing a two-stage queue run, don't do this if forcing. */
4845 if ((!f
.deliver_force
|| f
.queue_2stage
) && (f
.queue_smtp
||
4846 match_isinlist(addrlist
->domain
,
4847 (const uschar
**)&queue_smtp_domains
, 0,
4848 &domainlist_anchor
, NULL
, MCL_DOMAIN
, TRUE
, NULL
) == OK
))
4851 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4852 if (addr
->transport_return
== DEFER
)
4853 addr
->message
= US
"domain matches queue_smtp_domains, or -odqs set";
4854 continue; /* With next host */
4857 /* Count hosts being considered - purely for an intelligent comment
4858 if none are usable. */
4862 /* Set $host and $host address now in case they are needed for the
4863 interface expansion or the serialize_hosts check; they remain set if an
4864 actual delivery happens. */
4866 deliver_host
= host
->name
;
4867 deliver_host_address
= host
->address
;
4868 lookup_dnssec_authenticated
= host
->dnssec
== DS_YES
? US
"yes"
4869 : host
->dnssec
== DS_NO
? US
"no"
4872 /* Set up a string for adding to the retry key if the port number is not
4873 the standard SMTP port. A host may have its own port setting that overrides
4876 pistring
= string_sprintf(":%d", host
->port
== PORT_NONE
4877 ? defport
: host
->port
);
4878 if (Ustrcmp(pistring
, ":25") == 0) pistring
= US
"";
4880 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4881 string is set, even if constant (as different transports can have different
4882 constant settings), we must add it to the key that is used for retries,
4883 because connections to the same host from a different interface should be
4884 treated separately. */
4886 host_af
= Ustrchr(host
->address
, ':') == NULL
? AF_INET
: AF_INET6
;
4888 uschar
* s
= ob
->interface
;
4891 if (!smtp_get_interface(s
, host_af
, addrlist
, &interface
, tid
))
4893 pistring
= string_sprintf("%s/%s", pistring
, interface
);
4897 /* The first time round the outer loop, check the status of the host by
4898 inspecting the retry data. The second time round, we are interested only
4899 in expired hosts that haven't been tried since this message arrived. */
4901 if (cutoff_retry
== 0)
4904 /* Ensure the status of the address is set by checking retry data if
4905 necessary. There may be host-specific retry data (applicable to all
4906 messages) and also data for retries of a specific message at this host.
4907 If either of these retry records are actually read, the keys used are
4908 returned to save recomputing them later. */
4910 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
4911 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
4912 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
4913 continue; /* with next host */
4915 host_is_expired
= retry_check_address(addrlist
->domain
, host
, pistring
,
4916 incl_ip
, &retry_host_key
, &retry_message_key
);
4918 DEBUG(D_transport
) debug_printf("%s [%s]%s retry-status = %s\n", host
->name
,
4919 host
->address
? host
->address
: US
"", pistring
,
4920 host
->status
== hstatus_usable
? "usable"
4921 : host
->status
== hstatus_unusable
? "unusable"
4922 : host
->status
== hstatus_unusable_expired
? "unusable (expired)" : "?");
4924 /* Skip this address if not usable at this time, noting if it wasn't
4925 actually expired, both locally and in the address. */
4927 switch (host
->status
)
4929 case hstatus_unusable
:
4931 setflag(addrlist
, af_retry_skipped
);
4934 case hstatus_unusable_expired
:
4937 case hwhy_retry
: hosts_retry
++; break;
4938 case hwhy_failed
: hosts_fail
++; break;
4940 case hwhy_deferred
: hosts_defer
++; break;
4943 /* If there was a retry message key, implying that previously there
4944 was a message-specific defer, we don't want to update the list of
4945 messages waiting for these hosts. */
4947 if (retry_message_key
) update_waiting
= FALSE
;
4948 continue; /* With the next host or IP address */
4952 /* Second time round the loop: if the address is set but expired, and
4953 the message is newer than the last try, let it through. */
4958 || host
->status
!= hstatus_unusable_expired
4959 || host
->last_try
> received_time
.tv_sec
)
4961 DEBUG(D_transport
) debug_printf("trying expired host %s [%s]%s\n",
4962 host
->name
, host
->address
, pistring
);
4963 host_is_expired
= TRUE
;
4966 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4967 it remains TRUE only if all hosts are expired and none are actually tried.
4972 /* If this host is listed as one to which access must be serialized,
4973 see if another Exim process has a connection to it, and if so, skip
4974 this host. If not, update the database to record our connection to it
4975 and remember this for later deletion. Do not do any of this if we are
4976 sending the message down a pre-existing connection. */
4978 if ( !continue_hostname
4979 && verify_check_given_host(CUSS
&ob
->serialize_hosts
, host
) == OK
)
4981 serialize_key
= string_sprintf("host-serialize-%s", host
->name
);
4982 if (!enq_start(serialize_key
, 1))
4985 debug_printf("skipping host %s because another Exim process "
4986 "is connected to it\n", host
->name
);
4992 /* OK, we have an IP address that is not waiting for its retry time to
4993 arrive (it might be expired) OR (second time round the loop) we have an
4994 expired host that hasn't been tried since the message arrived. Have a go
4995 at delivering the message to it. First prepare the addresses by flushing
4996 out the result of previous attempts, and finding the first address that
4997 is still to be delivered. */
4999 first_addr
= prepare_addresses(addrlist
, host
);
5001 DEBUG(D_transport
) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5002 message_id
, host
->name
, host
->address
, addrlist
->address
,
5003 addrlist
->next
? ", ..." : "");
5005 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5006 message_id
, host
->name
, host
->address
, pistring
, addrlist
->address
,
5007 addrlist
->next
? ", ..." : "");
5009 /* This is not for real; don't do the delivery. If there are
5010 any remaining hosts, list them. */
5014 set_errno_nohost(addrlist
, 0, NULL
, OK
, FALSE
);
5015 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5017 addr
->host_used
= host
;
5018 addr
->special_action
= '*';
5019 addr
->message
= US
"delivery bypassed by -N option";
5023 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5024 "*** host and remaining hosts:\n", tblock
->name
);
5025 for (host_item
* host2
= host
; host2
; host2
= host2
->next
)
5026 debug_printf(" %s [%s]\n", host2
->name
,
5027 host2
->address
? host2
->address
: US
"unset");
5032 /* This is for real. If the host is expired, we don't count it for
5033 hosts_max_retry. This ensures that all hosts must expire before an address
5034 is timed out, unless hosts_max_try_hardlimit (which protects against
5035 lunatic DNS configurations) is reached.
5037 If the host is not expired and we are about to hit the hosts_max_retry
5038 limit, check to see if there is a subsequent hosts with a different MX
5039 value. If so, make that the next host, and don't count this one. This is a
5040 heuristic to make sure that different MXs do get tried. With a normal kind
5041 of retry rule, they would get tried anyway when the earlier hosts were
5042 delayed, but if the domain has a "retry every time" type of rule - as is
5043 often used for the the very large ISPs, that won't happen. */
5048 /* Make a copy of the host if it is local to this invocation
5049 of the transport. */
5053 thost
= store_get(sizeof(host_item
), FALSE
);
5055 thost
->name
= string_copy(host
->name
);
5056 thost
->address
= string_copy(host
->address
);
5061 if (!host_is_expired
&& ++unexpired_hosts_tried
>= ob
->hosts_max_try
)
5064 debug_printf("hosts_max_try limit reached with this host\n");
5065 for (host_item
* h
= host
; h
; h
= h
->next
) if (h
->mx
!= host
->mx
)
5068 unexpired_hosts_tried
--;
5069 DEBUG(D_transport
) debug_printf("however, a higher MX host exists "
5070 "and will be tried\n");
5075 /* Attempt the delivery. */
5077 total_hosts_tried
++;
5078 rc
= smtp_deliver(addrlist
, thost
, host_af
, defport
, interface
, tblock
,
5079 &message_defer
, FALSE
);
5082 OK => connection made, each address contains its result;
5083 message_defer is set for message-specific defers (when all
5084 recipients are marked defer)
5085 DEFER => there was a non-message-specific delivery problem;
5086 ERROR => there was a problem setting up the arguments for a filter,
5087 or there was a problem with expanding added headers
5090 /* If the result is not OK, there was a non-message-specific problem.
5091 If the result is DEFER, we need to write to the logs saying what happened
5092 for this particular host, except in the case of authentication and TLS
5093 failures, where the log has already been written. If all hosts defer a
5094 general message is written at the end. */
5096 if (rc
== DEFER
&& first_addr
->basic_errno
!= ERRNO_AUTHFAIL
5097 && first_addr
->basic_errno
!= ERRNO_TLSFAILURE
)
5098 write_logs(host
, first_addr
->message
, first_addr
->basic_errno
);
5100 #ifndef DISABLE_EVENT
5102 deferred_event_raise(first_addr
, host
);
5105 /* If STARTTLS was accepted, but there was a failure in setting up the
5106 TLS session (usually a certificate screwup), and the host is not in
5107 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5108 TLS forcibly turned off. We have to start from scratch with a new SMTP
5109 connection. That's why the retry is done from here, not from within
5110 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5111 session, so the in-clear transmission after those errors, if permitted,
5112 happens inside smtp_deliver().] */
5116 && first_addr
->basic_errno
== ERRNO_TLSFAILURE
5117 && ob
->tls_tempfail_tryclear
5118 && verify_check_given_host(CUSS
&ob
->hosts_require_tls
, host
) != OK
5121 log_write(0, LOG_MAIN
,
5122 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5123 first_addr
->message
, host
->name
, host
->address
);
5124 first_addr
= prepare_addresses(addrlist
, host
);
5125 rc
= smtp_deliver(addrlist
, thost
, host_af
, defport
, interface
, tblock
,
5126 &message_defer
, TRUE
);
5127 if (rc
== DEFER
&& first_addr
->basic_errno
!= ERRNO_AUTHFAIL
)
5128 write_logs(host
, first_addr
->message
, first_addr
->basic_errno
);
5129 # ifndef DISABLE_EVENT
5131 deferred_event_raise(first_addr
, host
);
5134 #endif /*DISABLE_TLS*/
5137 /* Delivery attempt finished */
5139 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5140 message_id
, host
->name
, host
->address
, pistring
, addrlist
->address
,
5141 addrlist
->next
? " (& others)" : "", rc_to_string(rc
));
5143 /* Release serialization if set up */
5145 if (serialize_key
) enq_end(serialize_key
);
5147 /* If the result is DEFER, or if a host retry record is known to exist, we
5148 need to add an item to the retry chain for updating the retry database
5149 at the end of delivery. We only need to add the item to the top address,
5150 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5151 for any other delivery attempts using the same address. (It is copied into
5152 the unusable tree at the outer level, so even if different address blocks
5153 contain the same address, it still won't get tried again.) */
5155 if (rc
== DEFER
|| retry_host_key
)
5157 int delete_flag
= rc
!= DEFER
? rf_delete
: 0;
5158 if (!retry_host_key
)
5161 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
5162 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
5163 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
5164 incl_ip
= TRUE
; /* error; use most-specific retry record */
5166 retry_host_key
= incl_ip
5167 ? string_sprintf("T:%S:%s%s", host
->name
, host
->address
, pistring
)
5168 : string_sprintf("T:%S%s", host
->name
, pistring
);
5171 /* If a delivery of another message over an existing SMTP connection
5172 yields DEFER, we do NOT set up retry data for the host. This covers the
5173 case when there are delays in routing the addresses in the second message
5174 that are so long that the server times out. This is alleviated by not
5175 routing addresses that previously had routing defers when handling an
5176 existing connection, but even so, this case may occur (e.g. if a
5177 previously happily routed address starts giving routing defers). If the
5178 host is genuinely down, another non-continued message delivery will
5179 notice it soon enough. */
5181 if (delete_flag
!= 0 || !continue_hostname
)
5182 retry_add_item(first_addr
, retry_host_key
, rf_host
| delete_flag
);
5184 /* We may have tried an expired host, if its retry time has come; ensure
5185 the status reflects the expiry for the benefit of any other addresses. */
5189 host
->status
= host_is_expired
5190 ? hstatus_unusable_expired
: hstatus_unusable
;
5191 host
->why
= hwhy_deferred
;
5195 /* If message_defer is set (host was OK, but every recipient got deferred
5196 because of some message-specific problem), or if that had happened
5197 previously so that a message retry key exists, add an appropriate item
5198 to the retry chain. Note that if there was a message defer but now there is
5199 a host defer, the message defer record gets deleted. That seems perfectly
5200 reasonable. Also, stop the message from being remembered as waiting
5201 for specific hosts. */
5203 if (message_defer
|| retry_message_key
)
5205 int delete_flag
= message_defer
? 0 : rf_delete
;
5206 if (!retry_message_key
)
5209 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
5210 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
5211 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
5212 incl_ip
= TRUE
; /* error; use most-specific retry record */
5214 retry_message_key
= incl_ip
5215 ? string_sprintf("T:%S:%s%s:%s", host
->name
, host
->address
, pistring
,
5217 : string_sprintf("T:%S%s:%s", host
->name
, pistring
, message_id
);
5219 retry_add_item(addrlist
, retry_message_key
,
5220 rf_message
| rf_host
| delete_flag
);
5221 update_waiting
= FALSE
;
5224 /* Any return other than DEFER (that is, OK or ERROR) means that the
5225 addresses have got their final statuses filled in for this host. In the OK
5226 case, see if any of them are deferred. */
5229 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5230 if (addr
->transport_return
== DEFER
)
5232 some_deferred
= TRUE
;
5236 /* If no addresses deferred or the result was ERROR, return. We do this for
5237 ERROR because a failing filter set-up or add_headers expansion is likely to
5238 fail for any host we try. */
5240 if (rc
== ERROR
|| (rc
== OK
&& !some_deferred
))
5242 DEBUG(D_transport
) debug_printf("Leaving %s transport\n", tblock
->name
);
5243 return TRUE
; /* Each address has its status */
5246 /* If the result was DEFER or some individual addresses deferred, let
5247 the loop run to try other hosts with the deferred addresses, except for the
5248 case when we were trying to deliver down an existing channel and failed.
5249 Don't try any other hosts in this case. */
5251 if (continue_hostname
) break;
5253 /* If the whole delivery, or some individual addresses, were deferred and
5254 there are more hosts that could be tried, do not count this host towards
5255 the hosts_max_try limit if the age of the message is greater than the
5256 maximum retry time for this host. This means we may try try all hosts,
5257 ignoring the limit, when messages have been around for some time. This is
5258 important because if we don't try all hosts, the address will never time
5259 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5261 if ((rc
== DEFER
|| some_deferred
) && nexthost
)
5264 retry_config
*retry
= retry_find_config(host
->name
, NULL
, 0, 0);
5266 if (retry
&& retry
->rules
)
5268 retry_rule
*last_rule
;
5269 for (last_rule
= retry
->rules
;
5271 last_rule
= last_rule
->next
);
5272 timedout
= time(NULL
) - received_time
.tv_sec
> last_rule
->timeout
;
5274 else timedout
= TRUE
; /* No rule => timed out */
5278 unexpired_hosts_tried
--;
5279 DEBUG(D_transport
) debug_printf("temporary delivery error(s) override "
5280 "hosts_max_try (message older than host's retry time)\n");
5286 if (unexpired_hosts_tried
>= ob
->hosts_max_try
)
5287 debug_printf("reached transport hosts_max_try limit %d\n",
5289 if (total_hosts_tried
>= ob
->hosts_max_try_hardlimit
)
5290 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5291 ob
->hosts_max_try_hardlimit
);
5294 testharness_pause_ms(500); /* let server debug out */
5295 } /* End of loop for trying multiple hosts. */
5297 /* If we failed to find a matching host in the list, for an already-open
5298 connection, just close it and start over with the list. This can happen
5299 for routing that changes from run to run, or big multi-IP sites with
5302 if (continue_hostname
&& !continue_host_tried
)
5304 int fd
= cutthrough
.cctx
.sock
>= 0 ? cutthrough
.cctx
.sock
: 0;
5306 DEBUG(D_transport
) debug_printf("no hosts match already-open connection\n");
5308 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5310 /*XXX doublecheck that! */
5312 if (cutthrough
.cctx
.sock
>= 0 && cutthrough
.is_tls
)
5314 (void) tls_write(cutthrough
.cctx
.tls_ctx
, US
"QUIT\r\n", 6, FALSE
);
5315 tls_close(cutthrough
.cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
5316 cutthrough
.cctx
.tls_ctx
= NULL
;
5317 cutthrough
.is_tls
= FALSE
;
5321 (void) write(fd
, US
"QUIT\r\n", 6);
5324 cutthrough
.cctx
.sock
= -1;
5325 continue_hostname
= NULL
;
5326 goto retry_non_continued
;
5329 /* This is the end of the loop that repeats iff expired is TRUE and
5330 ob->delay_after_cutoff is FALSE. The second time round we will
5331 try those hosts that haven't been tried since the message arrived. */
5335 debug_printf("all IP addresses skipped or deferred at least one address\n");
5336 if (expired
&& !ob
->delay_after_cutoff
&& cutoff_retry
== 0)
5337 debug_printf("retrying IP addresses not tried since message arrived\n");
5342 /* Get here if all IP addresses are skipped or defer at least one address. In
5343 MUA wrapper mode, this will happen only for connection or other non-message-
5344 specific failures. Force the delivery status for all addresses to FAIL. */
5348 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5349 addr
->transport_return
= FAIL
;
5353 /* In the normal, non-wrapper case, add a standard message to each deferred
5354 address if there hasn't been an error, that is, if it hasn't actually been
5355 tried this time. The variable "expired" will be FALSE if any deliveries were
5356 actually tried, or if there was at least one host that was not expired. That
5357 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5358 a delivery has been tried, an error code will be set, and the failing of the
5359 message is handled by the retry code later.
5361 If queue_smtp is set, or this transport was called to send a subsequent message
5362 down an existing TCP/IP connection, and something caused the host not to be
5363 found, we end up here, but can detect these cases and handle them specially. */
5365 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5367 /* If host is not NULL, it means that we stopped processing the host list
5368 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5369 means we need to behave as if some hosts were skipped because their retry
5370 time had not come. Specifically, this prevents the address from timing out.
5371 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5372 hosts were tried. */
5375 if (total_hosts_tried
>= ob
->hosts_max_try_hardlimit
)
5378 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5379 "hosts were tried\n");
5384 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5385 setflag(addr
, af_retry_skipped
);
5388 if (f
.queue_smtp
) /* no deliveries attempted */
5390 addr
->transport_return
= DEFER
;
5391 addr
->basic_errno
= 0;
5392 addr
->message
= US
"SMTP delivery explicitly queued";
5395 else if ( addr
->transport_return
== DEFER
5396 && (addr
->basic_errno
== ERRNO_UNKNOWNERROR
|| addr
->basic_errno
== 0)
5400 addr
->basic_errno
= ERRNO_HRETRY
;
5401 if (continue_hostname
)
5402 addr
->message
= US
"no host found for existing SMTP connection";
5405 setflag(addr
, af_pass_message
); /* This is not a security risk */
5406 addr
->message
= string_sprintf(
5407 "all hosts%s have been failing for a long time %s",
5408 addr
->domain
? string_sprintf(" for '%s'", addr
->domain
) : US
"",
5409 ob
->delay_after_cutoff
5410 ? US
"(and retry time not reached)"
5411 : US
"and were last tried after this message arrived");
5413 /* If we are already using fallback hosts, or there are no fallback hosts
5414 defined, convert the result to FAIL to cause a bounce. */
5416 if (addr
->host_list
== addr
->fallback_hosts
|| !addr
->fallback_hosts
)
5417 addr
->transport_return
= FAIL
;
5422 if (hosts_retry
== hosts_total
)
5423 s
= "retry time not reached for any host%s";
5424 else if (hosts_fail
== hosts_total
)
5425 s
= "all host address lookups%s failed permanently";
5426 else if (hosts_defer
== hosts_total
)
5427 s
= "all host address lookups%s failed temporarily";
5428 else if (hosts_serial
== hosts_total
)
5429 s
= "connection limit reached for all hosts%s";
5430 else if (hosts_fail
+hosts_defer
== hosts_total
)
5431 s
= "all host address lookups%s failed";
5433 s
= "some host address lookups failed and retry time "
5434 "not reached for other hosts or connection limit reached%s";
5436 addr
->message
= string_sprintf(s
,
5437 addr
->domain
? string_sprintf(" for '%s'", addr
->domain
) : US
"");
5442 /* Update the database which keeps information about which messages are waiting
5443 for which hosts to become available. For some message-specific errors, the
5444 update_waiting flag is turned off because we don't want follow-on deliveries in
5445 those cases. If this transport instance is explicitly limited to one message
5446 per connection then follow-on deliveries are not possible and there's no need
5447 to create/update the per-transport wait-<transport_name> database. */
5449 if (update_waiting
&& tblock
->connection_max_messages
!= 1)
5450 transport_update_waiting(hostlist
, tblock
->name
);
5454 DEBUG(D_transport
) debug_printf("Leaving %s transport\n", tblock
->name
);
5456 return TRUE
; /* Each address has its status */
5459 #endif /*!MACRO_PREDEF*/
5462 /* End of transport/smtp.c */