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/0x%04x crypted 0x%04x/0x%04x\n",
899 er
->data
.cleartext_features
, er
->data
.cleartext_auths
,
900 er
->data
.crypted_features
, er
->data
.crypted_auths
);
903 dbfn_close(dbm_file
);
910 /* Return an auths bitmap for the set of AUTH methods offered by the server
911 which match our authenticators. */
913 static unsigned short
914 study_ehlo_auths(smtp_context
* sx
)
919 unsigned short authbits
= 0;
921 if (!sx
->esmtp
) return 0;
922 if (!regex_AUTH
) regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
923 if (!regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)) return 0;
924 expand_nmax
= -1; /* reset */
925 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
927 for (au
= auths
, authnum
= 0; au
; au
= au
->next
, authnum
++) if (au
->client
)
929 const uschar
* list
= names
;
933 while (string_nextinlist(&list
, &sep
, name
, sizeof(name
)))
934 if (strcmpic(au
->public_name
, name
) == 0)
935 { authbits
|= BIT(authnum
); break; }
939 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
940 tls_out
.active
.sock
>= 0 ? "crypted" : "plaintext", names
, authbits
);
942 if (tls_out
.active
.sock
>= 0)
943 sx
->ehlo_resp
.crypted_auths
= authbits
;
945 sx
->ehlo_resp
.cleartext_auths
= authbits
;
952 /* Wait for and check responses for early-pipelining.
954 Called from the lower-level smtp_read_response() function
955 used for general code that assume synchronisation, if context
956 flags indicate outstanding early-pipelining commands. Also
957 called fom sync_responses() which handles pipelined commands.
960 sx smtp connection context
961 countp number of outstanding responses, adjusted on return
965 DEFER error on first read of TLS'd conn
966 FAIL SMTP error in response
969 smtp_reap_early_pipe(smtp_context
* sx
, int * countp
)
971 BOOL pending_BANNER
= sx
->pending_BANNER
;
972 BOOL pending_EHLO
= sx
->pending_EHLO
;
975 sx
->pending_BANNER
= FALSE
; /* clear early to avoid recursion */
976 sx
->pending_EHLO
= FALSE
;
980 DEBUG(D_transport
) debug_printf("%s expect banner\n", __FUNCTION__
);
982 if (!smtp_reap_banner(sx
))
984 DEBUG(D_transport
) debug_printf("bad banner\n");
985 if (tls_out
.active
.sock
>= 0) rc
= DEFER
;
992 unsigned peer_offered
;
993 unsigned short authbits
= 0, * ap
;
995 DEBUG(D_transport
) debug_printf("%s expect ehlo\n", __FUNCTION__
);
997 if (!smtp_reap_ehlo(sx
))
999 DEBUG(D_transport
) debug_printf("bad response for EHLO\n");
1000 if (tls_out
.active
.sock
>= 0) rc
= DEFER
;
1004 /* Compare the actual EHLO response to the cached value we assumed;
1005 on difference, dump or rewrite the cache and arrange for a retry. */
1007 ap
= tls_out
.active
.sock
< 0
1008 ? &sx
->ehlo_resp
.cleartext_auths
: &sx
->ehlo_resp
.crypted_auths
;
1010 peer_offered
= ehlo_response(sx
->buffer
,
1011 (tls_out
.active
.sock
< 0 ? OPTION_TLS
: 0)
1012 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
1013 | OPTION_UTF8
| OPTION_EARLY_PIPE
1015 if ( peer_offered
!= sx
->peer_offered
1016 || (authbits
= study_ehlo_auths(sx
)) != *ap
)
1019 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1020 tls_out
.active
.sock
< 0 ? "cleartext" : "crypted",
1021 sx
->peer_offered
, *ap
, peer_offered
, authbits
);
1022 *(tls_out
.active
.sock
< 0
1023 ? &sx
->ehlo_resp
.cleartext_features
: &sx
->ehlo_resp
.crypted_features
) = peer_offered
;
1025 if (peer_offered
& OPTION_EARLY_PIPE
)
1026 write_ehlo_cache_entry(sx
);
1028 invalidate_ehlo_cache_entry(sx
);
1030 return OK
; /* just carry on */
1036 invalidate_ehlo_cache_entry(sx
);
1037 (void) smtp_discard_responses(sx
, sx
->conn_args
.ob
, *countp
);
1043 /*************************************************
1044 * Synchronize SMTP responses *
1045 *************************************************/
1047 /* This function is called from smtp_deliver() to receive SMTP responses from
1048 the server, and match them up with the commands to which they relate. When
1049 PIPELINING is not in use, this function is called after every command, and is
1050 therefore somewhat over-engineered, but it is simpler to use a single scheme
1051 that works both with and without PIPELINING instead of having two separate sets
1054 The set of commands that are buffered up with pipelining may start with MAIL
1055 and may end with DATA; in between are RCPT commands that correspond to the
1056 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1057 etc.) are never buffered.
1059 Errors after MAIL or DATA abort the whole process leaving the response in the
1060 buffer. After MAIL, pending responses are flushed, and the original command is
1061 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1062 permitted to reject some recipient addresses while accepting others. However
1063 certain errors clearly abort the whole process. Set the value in
1064 transport_return to PENDING_OK if the address is accepted. If there is a
1065 subsequent general error, it will get reset accordingly. If not, it will get
1066 converted to OK at the end.
1069 sx smtp connection context
1070 count the number of responses to read
1071 pending_DATA 0 if last command sent was not DATA
1072 +1 if previously had a good recipient
1073 -1 if not previously had a good recipient
1075 Returns: 3 if at least one address had 2xx and one had 5xx
1076 2 if at least one address had 5xx but none had 2xx
1077 1 if at least one host had a 2xx response, but none had 5xx
1078 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1079 -1 timeout while reading RCPT response
1080 -2 I/O or other non-response error for RCPT
1081 -3 DATA or MAIL failed - errno and buffer set
1082 -4 banner or EHLO failed (early-pipelining)
1083 -5 banner or EHLO failed (early-pipelining, TLS)
1087 sync_responses(smtp_context
* sx
, int count
, int pending_DATA
)
1089 address_item
* addr
= sx
->sync_addr
;
1090 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
;
1093 #ifdef SUPPORT_PIPE_CONNECT
1095 if ((rc
= smtp_reap_early_pipe(sx
, &count
)) != OK
)
1096 return rc
== FAIL
? -4 : -5;
1099 /* Handle the response for a MAIL command. On error, reinstate the original
1100 command in big_buffer for error message use, and flush any further pending
1101 responses before returning, except after I/O errors and timeouts. */
1103 if (sx
->pending_MAIL
)
1105 DEBUG(D_transport
) debug_printf("%s expect mail\n", __FUNCTION__
);
1107 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1108 '2', ob
->command_timeout
))
1110 DEBUG(D_transport
) debug_printf("bad response for MAIL\n");
1111 Ustrcpy(big_buffer
, mail_command
); /* Fits, because it came from there! */
1112 if (errno
== ERRNO_TLSFAILURE
)
1114 if (errno
== 0 && sx
->buffer
[0] != 0)
1117 if (sx
->buffer
[0] == '4')
1119 save_errno
= ERRNO_MAIL4XX
;
1120 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1122 count
= smtp_discard_responses(sx
, ob
, count
);
1126 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1127 while (count
-- > 0) /* Mark any pending addrs with the host used */
1129 while (addr
->transport_return
!= PENDING_DEFER
) addr
= addr
->next
;
1130 addr
->host_used
= sx
->conn_args
.host
;
1137 if (pending_DATA
) count
--; /* Number of RCPT responses to come */
1139 /* Read and handle the required number of RCPT responses, matching each one up
1140 with an address by scanning for the next address whose status is PENDING_DEFER.
1145 while (addr
->transport_return
!= PENDING_DEFER
)
1146 if (!(addr
= addr
->next
))
1149 /* The address was accepted */
1150 addr
->host_used
= sx
->conn_args
.host
;
1152 DEBUG(D_transport
) debug_printf("%s expect rcpt\n", __FUNCTION__
);
1153 if (smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1154 '2', ob
->command_timeout
))
1157 addr
->transport_return
= PENDING_OK
;
1159 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1160 ensure that any address-specific retry record is expunged. We do this both
1161 for the basic key and for the version that also includes the sender. */
1163 if (testflag(addr
, af_dr_retry_exists
))
1165 uschar
*altkey
= string_sprintf("%s:<%s>", addr
->address_retry_key
,
1167 retry_add_item(addr
, altkey
, rf_delete
);
1168 retry_add_item(addr
, addr
->address_retry_key
, rf_delete
);
1172 /* Error on first TLS read */
1174 else if (errno
== ERRNO_TLSFAILURE
)
1177 /* Timeout while reading the response */
1179 else if (errno
== ETIMEDOUT
)
1181 uschar
*message
= string_sprintf("SMTP timeout after RCPT TO:<%s>",
1182 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1183 set_errno_nohost(sx
->first_addr
, ETIMEDOUT
, message
, DEFER
, FALSE
);
1184 retry_add_item(addr
, addr
->address_retry_key
, 0);
1185 update_waiting
= FALSE
;
1189 /* Handle other errors in obtaining an SMTP response by returning -1. This
1190 will cause all the addresses to be deferred. Restore the SMTP command in
1191 big_buffer for which we are checking the response, so the error message
1194 else if (errno
!= 0 || sx
->buffer
[0] == 0)
1196 gstring gs
= { .size
= big_buffer_size
, .ptr
= 0, .s
= big_buffer
}, * g
= &gs
;
1198 /* Use taint-unchecked routines for writing into big_buffer, trusting
1199 that we'll never expand it. */
1201 g
= string_fmt_append_f(g
, SVFMT_TAINT_NOCHK
, "RCPT TO:<%s>",
1202 transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
));
1203 string_from_gstring(g
);
1207 /* Handle SMTP permanent and temporary response codes. */
1212 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1213 "%s", transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
),
1214 string_printing(sx
->buffer
));
1215 setflag(addr
, af_pass_message
);
1217 msglog_line(sx
->conn_args
.host
, addr
->message
);
1219 /* The response was 5xx */
1221 if (sx
->buffer
[0] == '5')
1223 addr
->transport_return
= FAIL
;
1227 /* The response was 4xx */
1231 addr
->transport_return
= DEFER
;
1232 addr
->basic_errno
= ERRNO_RCPT4XX
;
1233 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1237 #ifndef DISABLE_EVENT
1238 event_defer_errno
= addr
->more_errno
;
1239 msg_event_raise(US
"msg:rcpt:host:defer", addr
);
1242 /* Log temporary errors if there are more hosts to be tried.
1243 If not, log this last one in the == line. */
1245 if (sx
->conn_args
.host
->next
)
1246 if (LOGGING(outgoing_port
))
1247 log_write(0, LOG_MAIN
, "H=%s [%s]:%d %s", sx
->conn_args
.host
->name
,
1248 sx
->conn_args
.host
->address
,
1249 sx
->port
== PORT_NONE
? 25 : sx
->port
, addr
->message
);
1251 log_write(0, LOG_MAIN
, "H=%s [%s]: %s", sx
->conn_args
.host
->name
,
1252 sx
->conn_args
.host
->address
, addr
->message
);
1254 #ifndef DISABLE_EVENT
1256 msg_event_raise(US
"msg:rcpt:defer", addr
);
1259 /* Do not put this message on the list of those waiting for specific
1260 hosts, as otherwise it is likely to be tried too often. */
1262 update_waiting
= FALSE
;
1264 /* Add a retry item for the address so that it doesn't get tried again
1265 too soon. If address_retry_include_sender is true, add the sender address
1266 to the retry key. */
1268 retry_add_item(addr
,
1269 ob
->address_retry_include_sender
1270 ? string_sprintf("%s:<%s>", addr
->address_retry_key
, sender_address
)
1271 : addr
->address_retry_key
,
1276 } /* Loop for next RCPT response */
1278 /* Update where to start at for the next block of responses, unless we
1279 have already handled all the addresses. */
1281 if (addr
) sx
->sync_addr
= addr
->next
;
1283 /* Handle a response to DATA. If we have not had any good recipients, either
1284 previously or in this block, the response is ignored. */
1286 if (pending_DATA
!= 0)
1288 DEBUG(D_transport
) debug_printf("%s expect data\n", __FUNCTION__
);
1289 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
1290 '3', ob
->command_timeout
))
1296 if (errno
== ERRNO_TLSFAILURE
) /* Error on first TLS read */
1299 if (pending_DATA
> 0 || (yield
& 1) != 0)
1301 if (errno
== 0 && sx
->buffer
[0] == '4')
1303 errno
= ERRNO_DATA4XX
;
1304 sx
->first_addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1308 (void)check_response(sx
->conn_args
.host
, &errno
, 0, sx
->buffer
, &code
, &msg
, &pass_message
);
1309 DEBUG(D_transport
) debug_printf("%s\nerror for DATA ignored: pipelining "
1310 "is in use and there were no good recipients\n", msg
);
1314 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1315 present) received 3xx. If any RCPTs were handled and yielded anything other
1316 than 4xx, yield will be set non-zero. */
1325 /* Try an authenticator's client entry */
1328 try_authenticator(smtp_context
* sx
, auth_instance
* au
)
1330 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1331 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1334 sx
->outblock
.authenticating
= TRUE
;
1335 rc
= (au
->info
->clientcode
)(au
, sx
, ob
->command_timeout
,
1336 sx
->buffer
, sizeof(sx
->buffer
));
1337 sx
->outblock
.authenticating
= FALSE
;
1338 DEBUG(D_transport
) debug_printf("%s authenticator yielded %d\n", au
->name
, rc
);
1340 /* A temporary authentication failure must hold up delivery to
1341 this host. After a permanent authentication failure, we carry on
1342 to try other authentication methods. If all fail hard, try to
1343 deliver the message unauthenticated unless require_auth was set. */
1348 f
.smtp_authenticated
= TRUE
; /* stops the outer loop */
1349 client_authenticator
= au
->name
;
1350 if (au
->set_client_id
)
1351 client_authenticated_id
= expand_string(au
->set_client_id
);
1354 /* Failure after writing a command */
1359 /* Failure after reading a response */
1362 if (errno
!= 0 || sx
->buffer
[0] != '5') return FAIL
;
1363 log_write(0, LOG_MAIN
, "%s authenticator failed H=%s [%s] %s",
1364 au
->name
, host
->name
, host
->address
, sx
->buffer
);
1367 /* Failure by some other means. In effect, the authenticator
1368 decided it wasn't prepared to handle this case. Typically this
1369 is the result of "fail" in an expansion string. Do we need to
1370 log anything here? Feb 2006: a message is now put in the buffer
1371 if logging is required. */
1374 if (*sx
->buffer
!= 0)
1375 log_write(0, LOG_MAIN
, "%s authenticator cancelled "
1376 "authentication H=%s [%s] %s", au
->name
, host
->name
,
1377 host
->address
, sx
->buffer
);
1380 /* Internal problem, message in buffer. */
1383 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHPROB
, string_copy(sx
->buffer
),
1393 /* Do the client side of smtp-level authentication.
1396 sx smtp connection context
1398 sx->buffer should have the EHLO response from server (gets overwritten)
1401 OK Success, or failed (but not required): global "smtp_authenticated" set
1402 DEFER Failed authentication (and was required)
1403 ERROR Internal problem
1405 FAIL_SEND Failed communications - transmit
1410 smtp_auth(smtp_context
* sx
)
1412 host_item
* host
= sx
->conn_args
.host
; /* host to deliver to */
1413 smtp_transport_options_block
* ob
= sx
->conn_args
.ob
; /* transport options */
1414 int require_auth
= verify_check_given_host(CUSS
&ob
->hosts_require_auth
, host
);
1415 #ifdef SUPPORT_PIPE_CONNECT
1416 unsigned short authbits
= tls_out
.active
.sock
>= 0
1417 ? sx
->ehlo_resp
.crypted_auths
: sx
->ehlo_resp
.cleartext_auths
;
1419 uschar
* fail_reason
= US
"server did not advertise AUTH support";
1421 f
.smtp_authenticated
= FALSE
;
1422 client_authenticator
= client_authenticated_id
= client_authenticated_sender
= NULL
;
1425 regex_AUTH
= regex_must_compile(AUTHS_REGEX
, FALSE
, TRUE
);
1427 /* Is the server offering AUTH? */
1431 #ifdef SUPPORT_PIPE_CONNECT
1432 sx
->early_pipe_active
? authbits
1435 regex_match_and_setup(regex_AUTH
, sx
->buffer
, 0, -1)
1438 uschar
* names
= NULL
;
1439 expand_nmax
= -1; /* reset */
1441 #ifdef SUPPORT_PIPE_CONNECT
1442 if (!sx
->early_pipe_active
)
1444 names
= string_copyn(expand_nstring
[1], expand_nlength
[1]);
1446 /* Must not do this check until after we have saved the result of the
1447 regex match above as the check could be another RE. */
1449 if ( require_auth
== OK
1450 || verify_check_given_host(CUSS
&ob
->hosts_try_auth
, host
) == OK
)
1452 DEBUG(D_transport
) debug_printf("scanning authentication mechanisms\n");
1453 fail_reason
= US
"no common mechanisms were found";
1455 #ifdef SUPPORT_PIPE_CONNECT
1456 if (sx
->early_pipe_active
)
1458 /* Scan our authenticators (which support use by a client and were offered
1459 by the server (checked at cache-write time)), not suppressed by
1460 client_condition. If one is found, attempt to authenticate by calling its
1461 client function. We are limited to supporting up to 16 authenticator
1462 public-names by the number of bits in a short. */
1468 for (bitnum
= 0, au
= auths
;
1469 !f
.smtp_authenticated
&& au
&& bitnum
< 16;
1470 bitnum
++, au
= au
->next
) if (authbits
& BIT(bitnum
))
1472 if ( au
->client_condition
1473 && !expand_check_condition(au
->client_condition
, au
->name
,
1474 US
"client authenticator"))
1476 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1477 au
->name
, "client_condition is false");
1481 /* Found data for a listed mechanism. Call its client entry. Set
1482 a flag in the outblock so that data is overwritten after sending so
1483 that reflections don't show it. */
1485 fail_reason
= US
"authentication attempt(s) failed";
1487 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1494 /* Scan the configured authenticators looking for one which is configured
1495 for use as a client, which is not suppressed by client_condition, and
1496 whose name matches an authentication mechanism supported by the server.
1497 If one is found, attempt to authenticate by calling its client function.
1500 for (auth_instance
* au
= auths
; !f
.smtp_authenticated
&& au
; au
= au
->next
)
1505 || ( au
->client_condition
1506 && !expand_check_condition(au
->client_condition
, au
->name
,
1507 US
"client authenticator")))
1509 DEBUG(D_transport
) debug_printf("skipping %s authenticator: %s\n",
1511 (au
->client
)? "client_condition is false" :
1512 "not configured as a client");
1516 /* Loop to scan supported server mechanisms */
1520 int len
= Ustrlen(au
->public_name
);
1523 while (isspace(*p
)) p
++;
1525 if (strncmpic(au
->public_name
, p
, len
) != 0 ||
1526 (p
[len
] != 0 && !isspace(p
[len
])))
1528 while (*p
!= 0 && !isspace(*p
)) p
++;
1532 /* Found data for a listed mechanism. Call its client entry. Set
1533 a flag in the outblock so that data is overwritten after sending so
1534 that reflections don't show it. */
1536 fail_reason
= US
"authentication attempt(s) failed";
1538 if ((rc
= try_authenticator(sx
, au
)) != OK
)
1541 break; /* If not authenticated, try next authenticator */
1542 } /* Loop for scanning supported server mechanisms */
1543 } /* Loop for further authenticators */
1547 /* If we haven't authenticated, but are required to, give up. */
1549 if (require_auth
== OK
&& !f
.smtp_authenticated
)
1551 set_errno_nohost(sx
->addrlist
, ERRNO_AUTHFAIL
,
1552 string_sprintf("authentication required but %s", fail_reason
), DEFER
,
1561 /* Construct AUTH appendix string for MAIL TO */
1564 buffer to build string
1565 addrlist chain of potential addresses to deliver
1566 ob transport options
1568 Globals f.smtp_authenticated
1569 client_authenticated_sender
1570 Return True on error, otherwise buffer has (possibly empty) terminated string
1574 smtp_mail_auth_str(uschar
*buffer
, unsigned bufsize
, address_item
*addrlist
,
1575 smtp_transport_options_block
*ob
)
1577 uschar
* local_authenticated_sender
= authenticated_sender
;
1580 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender
, ob
->authenticated_sender
, f
.smtp_authenticated
?"Y":"N");
1583 if (ob
->authenticated_sender
)
1585 uschar
*new = expand_string(ob
->authenticated_sender
);
1588 if (!f
.expand_string_forcedfail
)
1590 uschar
*message
= string_sprintf("failed to expand "
1591 "authenticated_sender: %s", expand_string_message
);
1592 set_errno_nohost(addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
1596 else if (*new) local_authenticated_sender
= new;
1599 /* Add the authenticated sender address if present */
1601 if ( (f
.smtp_authenticated
|| ob
->authenticated_sender_force
)
1602 && local_authenticated_sender
)
1604 string_format_nt(buffer
, bufsize
, " AUTH=%s",
1605 auth_xtextencode(local_authenticated_sender
,
1606 Ustrlen(local_authenticated_sender
)));
1607 client_authenticated_sender
= string_copy(local_authenticated_sender
);
1617 typedef struct smtp_compare_s
1619 uschar
*current_sender_address
;
1620 struct transport_instance
*tblock
;
1624 /* Create a unique string that identifies this message, it is based on
1625 sender_address, helo_data and tls_certificate if enabled.
1629 smtp_local_identity(uschar
* sender
, struct transport_instance
* tblock
)
1631 address_item
* addr1
;
1632 uschar
* if1
= US
"";
1633 uschar
* helo1
= US
"";
1635 uschar
* tlsc1
= US
"";
1637 uschar
* save_sender_address
= sender_address
;
1638 uschar
* local_identity
= NULL
;
1639 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
1641 sender_address
= sender
;
1643 addr1
= deliver_make_addr (sender
, TRUE
);
1644 deliver_set_expansions(addr1
);
1647 if1
= expand_string(ob
->interface
);
1650 helo1
= expand_string(ob
->helo_data
);
1653 if (ob
->tls_certificate
)
1654 tlsc1
= expand_string(ob
->tls_certificate
);
1655 local_identity
= string_sprintf ("%s^%s^%s", if1
, helo1
, tlsc1
);
1657 local_identity
= string_sprintf ("%s^%s", if1
, helo1
);
1660 deliver_set_expansions(NULL
);
1661 sender_address
= save_sender_address
;
1663 return local_identity
;
1668 /* This routine is a callback that is called from transport_check_waiting.
1669 This function will evaluate the incoming message versus the previous
1670 message. If the incoming message is using a different local identity then
1671 we will veto this new message. */
1674 smtp_are_same_identities(uschar
* message_id
, smtp_compare_t
* s_compare
)
1676 uschar
* message_local_identity
,
1677 * current_local_identity
,
1678 * new_sender_address
;
1680 current_local_identity
=
1681 smtp_local_identity(s_compare
->current_sender_address
, s_compare
->tblock
);
1683 if (!(new_sender_address
= deliver_get_sender_address(message_id
)))
1686 message_local_identity
=
1687 smtp_local_identity(new_sender_address
, s_compare
->tblock
);
1689 return Ustrcmp(current_local_identity
, message_local_identity
) == 0;
1695 ehlo_response(uschar
* buf
, unsigned checks
)
1697 size_t bsize
= Ustrlen(buf
);
1699 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1702 if ( checks
& OPTION_TLS
1703 && pcre_exec(regex_STARTTLS
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1705 checks
&= ~OPTION_TLS
;
1707 if ( checks
& OPTION_IGNQ
1708 && pcre_exec(regex_IGNOREQUOTA
, NULL
, CS buf
, bsize
, 0,
1709 PCRE_EOPT
, NULL
, 0) < 0)
1710 checks
&= ~OPTION_IGNQ
;
1712 if ( checks
& OPTION_CHUNKING
1713 && pcre_exec(regex_CHUNKING
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1714 checks
&= ~OPTION_CHUNKING
;
1716 #ifndef DISABLE_PRDR
1717 if ( checks
& OPTION_PRDR
1718 && pcre_exec(regex_PRDR
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1720 checks
&= ~OPTION_PRDR
;
1723 if ( checks
& OPTION_UTF8
1724 && pcre_exec(regex_UTF8
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1726 checks
&= ~OPTION_UTF8
;
1728 if ( checks
& OPTION_DSN
1729 && pcre_exec(regex_DSN
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1730 checks
&= ~OPTION_DSN
;
1732 if ( checks
& OPTION_PIPE
1733 && pcre_exec(regex_PIPELINING
, NULL
, CS buf
, bsize
, 0,
1734 PCRE_EOPT
, NULL
, 0) < 0)
1735 checks
&= ~OPTION_PIPE
;
1737 if ( checks
& OPTION_SIZE
1738 && pcre_exec(regex_SIZE
, NULL
, CS buf
, bsize
, 0, PCRE_EOPT
, NULL
, 0) < 0)
1739 checks
&= ~OPTION_SIZE
;
1741 #ifdef SUPPORT_PIPE_CONNECT
1742 if ( checks
& OPTION_EARLY_PIPE
1743 && pcre_exec(regex_EARLY_PIPE
, NULL
, CS buf
, bsize
, 0,
1744 PCRE_EOPT
, NULL
, 0) < 0)
1746 checks
&= ~OPTION_EARLY_PIPE
;
1748 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1754 /* Callback for emitting a BDAT data chunk header.
1756 If given a nonzero size, first flush any buffered SMTP commands
1757 then emit the command.
1759 Reap previous SMTP command responses if requested, and always reap
1760 the response from a previous BDAT command.
1763 tctx transport context
1764 chunk_size value for SMTP BDAT command
1766 tc_chunk_last add LAST option to SMTP BDAT command
1767 tc_reap_prev reap response to previous SMTP commands
1771 DEFER TLS error on first read (EHLO-resp); errno set
1775 smtp_chunk_cmd_callback(transport_ctx
* tctx
, unsigned chunk_size
,
1778 smtp_transport_options_block
* ob
= SOB tctx
->tblock
->options_block
;
1779 smtp_context
* sx
= tctx
->smtp_context
;
1783 /* Write SMTP chunk header command. If not reaping responses, note that
1784 there may be more writes (like, the chunk data) done soon. */
1788 #ifdef SUPPORT_PIPE_CONNECT
1789 BOOL new_conn
= !!(sx
->outblock
.conn_args
);
1791 if((cmd_count
= smtp_write_command(sx
,
1792 flags
& tc_reap_prev
? SCMD_FLUSH
: SCMD_MORE
,
1793 "BDAT %u%s\r\n", chunk_size
, flags
& tc_chunk_last
? " LAST" : "")
1794 ) < 0) return ERROR
;
1795 if (flags
& tc_chunk_last
)
1796 data_command
= string_copy(big_buffer
); /* Save for later error message */
1797 #ifdef SUPPORT_PIPE_CONNECT
1798 /* That command write could have been the one that made the connection.
1799 Copy the fd from the client conn ctx (smtp transport specific) to the
1800 generic transport ctx. */
1803 tctx
->u
.fd
= sx
->outblock
.cctx
->sock
;
1807 prev_cmd_count
= cmd_count
+= sx
->cmd_count
;
1809 /* Reap responses for any previous, but not one we just emitted */
1813 if (sx
->pending_BDAT
)
1816 if (flags
& tc_reap_prev
&& prev_cmd_count
> 0)
1818 DEBUG(D_transport
) debug_printf("look for %d responses"
1819 " for previous pipelined cmds\n", prev_cmd_count
);
1821 switch(sync_responses(sx
, prev_cmd_count
, 0))
1823 case 1: /* 2xx (only) => OK */
1824 case 3: sx
->good_RCPT
= TRUE
; /* 2xx & 5xx => OK & progress made */
1825 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
1826 case 0: break; /* No 2xx or 5xx, but no probs */
1828 case -5: errno
= ERRNO_TLSFAILURE
;
1830 #ifdef SUPPORT_PIPE_CONNECT
1831 case -4: /* non-2xx for pipelined banner or EHLO */
1833 case -1: /* Timeout on RCPT */
1834 default: return ERROR
; /* I/O error, or any MAIL/DATA error */
1837 if (!sx
->pending_BDAT
)
1838 pipelining_active
= FALSE
;
1841 /* Reap response for an outstanding BDAT */
1843 if (sx
->pending_BDAT
)
1845 DEBUG(D_transport
) debug_printf("look for one response for BDAT\n");
1847 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
1848 ob
->command_timeout
))
1850 if (errno
== 0 && sx
->buffer
[0] == '4')
1852 errno
= ERRNO_DATA4XX
; /*XXX does this actually get used? */
1853 sx
->addrlist
->more_errno
|=
1854 ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
1859 sx
->pending_BDAT
= FALSE
;
1860 pipelining_active
= FALSE
;
1862 else if (chunk_size
> 0)
1863 sx
->pending_BDAT
= TRUE
;
1866 sx
->cmd_count
= cmd_count
;
1874 /*************************************************
1875 * Make connection for given message *
1876 *************************************************/
1880 ctx connection context
1881 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1882 a second attempt after TLS initialization fails
1884 Returns: OK - the connection was made and the delivery attempted;
1885 fd is set in the conn context, tls_out set up.
1886 DEFER - the connection could not be made, or something failed
1887 while setting up the SMTP session, or there was a
1888 non-message-specific error, such as a timeout.
1889 ERROR - helo_data or add_headers or authenticated_sender is
1890 specified for this transport, and the string failed
1894 smtp_setup_conn(smtp_context
* sx
, BOOL suppress_tls
)
1896 smtp_transport_options_block
* ob
= sx
->conn_args
.tblock
->options_block
;
1897 BOOL pass_message
= FALSE
;
1898 uschar
* message
= NULL
;
1901 uschar
* tls_errstr
;
1904 sx
->conn_args
.ob
= ob
;
1906 sx
->lmtp
= strcmpic(ob
->protocol
, US
"lmtp") == 0;
1907 sx
->smtps
= strcmpic(ob
->protocol
, US
"smtps") == 0;
1908 /* sx->ok = FALSE; */
1909 sx
->send_rset
= TRUE
;
1910 sx
->send_quit
= TRUE
;
1911 sx
->setting_up
= TRUE
;
1913 /* sx->esmtp_sent = FALSE; */
1915 /* sx->utf8_needed = FALSE; */
1917 sx
->dsn_all_lasthop
= TRUE
;
1919 /* sx->conn_args.dane = FALSE; */
1921 verify_check_given_host(CUSS
&ob
->hosts_require_dane
, sx
->conn_args
.host
) == OK
;
1923 #ifdef SUPPORT_PIPE_CONNECT
1924 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1925 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1926 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1929 if ((sx
->max_rcpt
= sx
->conn_args
.tblock
->max_addresses
) == 0) sx
->max_rcpt
= 999999;
1930 /* sx->peer_offered = 0; */
1931 /* sx->avoid_option = 0; */
1932 sx
->igquotstr
= US
"";
1933 if (!sx
->helo_data
) sx
->helo_data
= ob
->helo_data
;
1934 #ifdef EXPERIMENTAL_DSN_INFO
1935 /* sx->smtp_greeting = NULL; */
1936 /* sx->helo_response = NULL; */
1939 smtp_command
= US
"initial connection";
1940 /* sx->buffer[0] = '\0'; */
1942 /* Set up the buffer for reading SMTP response packets. */
1944 sx
->inblock
.buffer
= sx
->inbuffer
;
1945 sx
->inblock
.buffersize
= sizeof(sx
->inbuffer
);
1946 sx
->inblock
.ptr
= sx
->inbuffer
;
1947 sx
->inblock
.ptrend
= sx
->inbuffer
;
1949 /* Set up the buffer for holding SMTP commands while pipelining */
1951 sx
->outblock
.buffer
= sx
->outbuffer
;
1952 sx
->outblock
.buffersize
= sizeof(sx
->outbuffer
);
1953 sx
->outblock
.ptr
= sx
->outbuffer
;
1954 /* sx->outblock.cmd_count = 0; */
1955 /* sx->outblock.authenticating = FALSE; */
1956 /* sx->outblock.conn_args = NULL; */
1958 /* Reset the parameters of a TLS session. */
1961 tls_out
.cipher
= NULL
; /* the one we may use for this transport */
1962 tls_out
.ourcert
= NULL
;
1963 tls_out
.peercert
= NULL
;
1964 tls_out
.peerdn
= NULL
;
1968 tls_out
.ocsp
= OCSP_NOT_REQ
;
1969 #ifdef EXPERIMENTAL_TLS_RESUME
1970 tls_out
.resumption
= 0;
1974 /* Flip the legacy TLS-related variables over to the outbound set in case
1975 they're used in the context of the transport. Don't bother resetting
1976 afterward (when being used by a transport) as we're in a subprocess.
1977 For verify, unflipped once the callout is dealt with */
1979 tls_modify_variables(&tls_out
);
1984 set_errno_nohost(sx
->addrlist
, ERRNO_TLSFAILURE
, US
"TLS support not available",
1990 /* Make a connection to the host if this isn't a continued delivery, and handle
1991 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1992 specially so they can be identified for retries. */
1994 if (!continue_hostname
)
1997 HDEBUG(D_verify
) debug_printf("interface=%s port=%d\n", sx
->conn_args
.interface
, sx
->port
);
1999 /* Get the actual port the connection will use, into sx->conn_args.host */
2001 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
);
2004 /* Do TLSA lookup for DANE */
2006 tls_out
.dane_verified
= FALSE
;
2007 tls_out
.tlsa_usage
= 0;
2009 if (sx
->conn_args
.host
->dnssec
== DS_YES
)
2012 if( sx
->dane_required
2013 || verify_check_given_host(CUSS
&ob
->hosts_try_dane
, sx
->conn_args
.host
) == OK
2015 switch (rc
= tlsa_lookup(sx
->conn_args
.host
, &sx
->conn_args
.tlsa_dnsa
, sx
->dane_required
))
2017 case OK
: sx
->conn_args
.dane
= TRUE
;
2018 ob
->tls_tempfail_tryclear
= FALSE
;
2020 case FAIL_FORCED
: break;
2021 default: set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2022 string_sprintf("DANE error: tlsa lookup %s",
2025 # ifndef DISABLE_EVENT
2026 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2027 US
"dane:fail", sx
->dane_required
2028 ? US
"dane-required" : US
"dnssec-invalid");
2033 else if (sx
->dane_required
)
2035 set_errno_nohost(sx
->addrlist
, ERRNO_DNSDEFER
,
2036 string_sprintf("DANE error: %s lookup not DNSSEC", sx
->conn_args
.host
->name
),
2038 # ifndef DISABLE_EVENT
2039 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2040 US
"dane:fail", US
"dane-required");
2047 /* Make the TCP connection */
2049 sx
->cctx
.tls_ctx
= NULL
;
2050 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2051 sx
->avoid_option
= sx
->peer_offered
= smtp_peer_options
= 0;
2053 #ifdef SUPPORT_PIPE_CONNECT
2054 if ( verify_check_given_host(CUSS
&ob
->hosts_pipe_connect
,
2055 sx
->conn_args
.host
) == OK
)
2057 /* We don't find out the local ip address until the connect, so if
2058 the helo string might use it avoid doing early-pipelining. */
2061 || !Ustrstr(sx
->helo_data
, "$sending_ip_address")
2062 || Ustrstr(sx
->helo_data
, "def:sending_ip_address")
2065 sx
->early_pipe_ok
= TRUE
;
2066 if ( read_ehlo_cache_entry(sx
)
2067 && sx
->ehlo_resp
.cleartext_features
& OPTION_EARLY_PIPE
)
2070 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2071 sx
->early_pipe_active
= TRUE
;
2072 sx
->peer_offered
= sx
->ehlo_resp
.cleartext_features
;
2075 else DEBUG(D_transport
)
2076 debug_printf("helo needs $sending_ip_address\n");
2078 if (sx
->early_pipe_active
)
2079 sx
->outblock
.conn_args
= &sx
->conn_args
;
2083 if ((sx
->cctx
.sock
= smtp_connect(&sx
->conn_args
, NULL
)) < 0)
2085 set_errno_nohost(sx
->addrlist
,
2086 errno
== ETIMEDOUT
? ERRNO_CONNECTTIMEOUT
: errno
,
2087 sx
->verify
? US
strerror(errno
) : NULL
,
2089 sx
->send_quit
= FALSE
;
2093 /* Expand the greeting message while waiting for the initial response. (Makes
2094 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2095 delayed till here so that $sending_interface and $sending_port are set. */
2096 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2097 will be? Somehow I doubt it. */
2100 if (!(sx
->helo_data
= expand_string(sx
->helo_data
)))
2102 log_write(0, LOG_MAIN
|LOG_PANIC
,
2103 "<%s>: failed to expand transport's helo_data value for callout: %s",
2104 sx
->addrlist
->address
, expand_string_message
);
2109 expand_string_message
= NULL
;
2110 if ((sx
->helo_data
= string_domain_utf8_to_alabel(sx
->helo_data
,
2111 &expand_string_message
)),
2112 expand_string_message
)
2114 log_write(0, LOG_MAIN
|LOG_PANIC
,
2115 "<%s>: failed to expand transport's helo_data value for callout: %s",
2116 sx
->addrlist
->address
, expand_string_message
);
2118 sx
->helo_data
= NULL
;
2122 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2123 is nevertheless a reasonably clean way of programming this kind of logic,
2124 where you want to escape on any error. */
2128 #ifdef SUPPORT_PIPE_CONNECT
2129 if (sx
->early_pipe_active
)
2131 sx
->pending_BANNER
= TRUE
; /* sync_responses() must eventually handle */
2132 sx
->outblock
.cmd_count
= 1;
2138 (void) setsockopt(sx
->cctx
.sock
, IPPROTO_TCP
, TCP_QUICKACK
, US
&off
,
2141 if (!smtp_reap_banner(sx
))
2142 goto RESPONSE_FAILED
;
2145 #ifndef DISABLE_EVENT
2148 lookup_dnssec_authenticated
= sx
->conn_args
.host
->dnssec
==DS_YES
? US
"yes"
2149 : sx
->conn_args
.host
->dnssec
==DS_NO
? US
"no" : NULL
;
2150 s
= event_raise(sx
->conn_args
.tblock
->event_action
, US
"smtp:connect", sx
->buffer
);
2153 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
,
2154 string_sprintf("deferred by smtp:connect event expansion: %s", s
),
2162 /* Now check if the helo_data expansion went well, and sign off cleanly if
2167 message
= string_sprintf("failed to expand helo_data: %s",
2168 expand_string_message
);
2169 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2175 /** Debugging without sending a message
2176 sx->addrlist->transport_return = DEFER;
2180 /* Errors that occur after this point follow an SMTP command, which is
2181 left in big_buffer by smtp_write_command() for use in error messages. */
2183 smtp_command
= big_buffer
;
2185 /* Tell the remote who we are...
2187 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2188 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2189 greeting is of this form. The assumption was that the far end supports it
2190 properly... but experience shows that there are some that give 5xx responses,
2191 even though the banner includes "ESMTP" (there's a bloody-minded one that
2192 says "ESMTP not spoken here"). Cope with that case.
2194 September 2000: Time has passed, and it seems reasonable now to always send
2195 EHLO at the start. It is also convenient to make the change while installing
2198 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2199 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2200 would be no way to send out the mails, so there is now a host list
2201 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2202 PIPELINING problem as well. Maybe it can also be useful to cure other
2203 problems with broken servers.
2205 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2206 Then somebody tried it with a Microsoft mailer... It seems that all other
2207 mailers use upper case for some reason (the RFC is quite clear about case
2208 independence) so, for peace of mind, I gave in. */
2210 sx
->esmtp
= verify_check_given_host(CUSS
&ob
->hosts_avoid_esmtp
, sx
->conn_args
.host
) != OK
;
2212 /* Alas; be careful, since this goto is not an error-out, so conceivably
2213 we might set data between here and the target which we assume to exist
2214 and be usable. I can see this coming back to bite us. */
2218 smtp_peer_options
|= OPTION_TLS
;
2219 suppress_tls
= FALSE
;
2220 ob
->tls_tempfail_tryclear
= FALSE
;
2221 smtp_command
= US
"SSL-on-connect";
2228 if (smtp_write_command(sx
,
2229 #ifdef SUPPORT_PIPE_CONNECT
2230 sx
->early_pipe_active
? SCMD_BUFFER
:
2233 "%s %s\r\n", sx
->lmtp
? "LHLO" : "EHLO", sx
->helo_data
) < 0)
2235 sx
->esmtp_sent
= TRUE
;
2237 #ifdef SUPPORT_PIPE_CONNECT
2238 if (sx
->early_pipe_active
)
2240 sx
->pending_EHLO
= TRUE
;
2242 /* If we have too many authenticators to handle and might need to AUTH
2243 for this transport, pipeline no further as we will need the
2244 list of auth methods offered. Reap the banner and EHLO. */
2246 if ( (ob
->hosts_require_auth
|| ob
->hosts_try_auth
)
2247 && f
.smtp_in_early_pipe_no_auth
)
2249 DEBUG(D_transport
) debug_printf("may need to auth, so pipeline no further\n");
2250 if (smtp_write_command(sx
, SCMD_FLUSH
, NULL
) < 0)
2252 if (sync_responses(sx
, 2, 0) != 0)
2255 debug_printf("failed reaping pipelined cmd responses\n");
2256 goto RESPONSE_FAILED
;
2258 sx
->early_pipe_active
= FALSE
;
2263 if (!smtp_reap_ehlo(sx
))
2264 goto RESPONSE_FAILED
;
2268 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2270 #ifdef SUPPORT_PIPE_CONNECT
2271 if (!sx
->early_pipe_active
)
2276 int n
= sizeof(sx
->buffer
);
2277 uschar
* rsp
= sx
->buffer
;
2279 if (sx
->esmtp_sent
&& (n
= Ustrlen(sx
->buffer
)) < sizeof(sx
->buffer
)/2)
2280 { rsp
= sx
->buffer
+ n
+ 1; n
= sizeof(sx
->buffer
) - n
; }
2282 if (smtp_write_command(sx
, SCMD_FLUSH
, "HELO %s\r\n", sx
->helo_data
) < 0)
2284 good_response
= smtp_read_response(sx
, rsp
, n
, '2', ob
->command_timeout
);
2285 #ifdef EXPERIMENTAL_DSN_INFO
2286 sx
->helo_response
= string_copy(rsp
);
2290 /* Handle special logging for a closed connection after HELO
2291 when had previously sent EHLO */
2293 if (rsp
!= sx
->buffer
&& rsp
[0] == 0 && (errno
== 0 || errno
== ECONNRESET
))
2295 errno
= ERRNO_SMTPCLOSED
;
2296 goto EHLOHELO_FAILED
;
2298 memmove(sx
->buffer
, rsp
, Ustrlen(rsp
));
2299 goto RESPONSE_FAILED
;
2303 if (sx
->esmtp
|| sx
->lmtp
)
2305 #ifdef SUPPORT_PIPE_CONNECT
2306 if (!sx
->early_pipe_active
)
2309 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2310 OPTION_TLS
/* others checked later */
2311 #ifdef SUPPORT_PIPE_CONNECT
2312 | (sx
->early_pipe_ok
2314 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2323 #ifdef SUPPORT_PIPE_CONNECT
2324 if (sx
->early_pipe_ok
)
2326 sx
->ehlo_resp
.cleartext_features
= sx
->peer_offered
;
2328 if ( (sx
->peer_offered
& (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2329 == (OPTION_PIPE
| OPTION_EARLY_PIPE
))
2331 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2332 sx
->ehlo_resp
.cleartext_auths
= study_ehlo_auths(sx
);
2333 write_ehlo_cache_entry(sx
);
2339 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2342 smtp_peer_options
|= sx
->peer_offered
& OPTION_TLS
;
2347 /* For continuing deliveries down the same channel, having re-exec'd the socket
2348 is the standard input; for a socket held open from verify it is recorded
2349 in the cutthrough context block. Either way we don't need to redo EHLO here
2350 (but may need to do so for TLS - see below).
2351 Set up the pointer to where subsequent commands will be left, for
2352 error messages. Note that smtp_peer_options will have been
2353 set from the command line if they were set in the process that passed the
2356 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2357 as the continue goes via transport_pass_socket() and doublefork and exec.
2358 It does not wait. Unclear how we keep separate host's responses
2359 separate - we could match up by host ip+port as a bodge. */
2363 if (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
)
2365 sx
->cctx
= cutthrough
.cctx
;
2366 sx
->conn_args
.host
->port
= sx
->port
= cutthrough
.host
.port
;
2370 sx
->cctx
.sock
= 0; /* stdin */
2371 sx
->cctx
.tls_ctx
= NULL
;
2372 smtp_port_for_connect(sx
->conn_args
.host
, sx
->port
); /* Record the port that was used */
2374 sx
->inblock
.cctx
= sx
->outblock
.cctx
= &sx
->cctx
;
2375 smtp_command
= big_buffer
;
2376 sx
->helo_data
= NULL
; /* ensure we re-expand ob->helo_data */
2378 /* For a continued connection with TLS being proxied for us, or a
2379 held-open verify connection with TLS, nothing more to do. */
2381 if ( continue_proxy_cipher
2382 || (cutthrough
.cctx
.sock
>= 0 && cutthrough
.callout_hold_only
2383 && cutthrough
.is_tls
)
2386 sx
->peer_offered
= smtp_peer_options
;
2387 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2388 HDEBUG(D_transport
) debug_printf("continued connection, %s TLS\n",
2389 continue_proxy_cipher
? "proxied" : "verify conn with");
2392 HDEBUG(D_transport
) debug_printf("continued connection, no TLS\n");
2395 /* If TLS is available on this connection, whether continued or not, attempt to
2396 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2397 send another EHLO - the server may give a different answer in secure mode. We
2398 use a separate buffer for reading the response to STARTTLS so that if it is
2399 negative, the original EHLO data is available for subsequent analysis, should
2400 the client not be required to use TLS. If the response is bad, copy the buffer
2401 for error analysis. */
2404 if ( smtp_peer_options
& OPTION_TLS
2406 && verify_check_given_host(CUSS
&ob
->hosts_avoid_tls
, sx
->conn_args
.host
) != OK
2408 || verify_check_given_host(CUSS
&ob
->hosts_verify_avoid_tls
, sx
->conn_args
.host
) != OK
2411 uschar buffer2
[4096];
2413 if (smtp_write_command(sx
, SCMD_FLUSH
, "STARTTLS\r\n") < 0)
2416 #ifdef SUPPORT_PIPE_CONNECT
2417 /* If doing early-pipelining reap the banner and EHLO-response but leave
2418 the response for the STARTTLS we just sent alone. */
2420 if (sx
->early_pipe_active
&& sync_responses(sx
, 2, 0) != 0)
2423 debug_printf("failed reaping pipelined cmd responses\n");
2424 goto RESPONSE_FAILED
;
2428 /* If there is an I/O error, transmission of this message is deferred. If
2429 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2430 false, we also defer. However, if there is a temporary rejection of STARTTLS
2431 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2432 STARTTLS, we carry on. This means we will try to send the message in clear,
2433 unless the host is in hosts_require_tls (tested below). */
2435 if (!smtp_read_response(sx
, buffer2
, sizeof(buffer2
), '2', ob
->command_timeout
))
2439 || (buffer2
[0] == '4' && !ob
->tls_tempfail_tryclear
)
2442 Ustrncpy(sx
->buffer
, buffer2
, sizeof(sx
->buffer
));
2443 sx
->buffer
[sizeof(sx
->buffer
)-1] = '\0';
2444 goto RESPONSE_FAILED
;
2448 /* STARTTLS accepted: try to negotiate a TLS session. */
2453 if (!tls_client_start(&sx
->cctx
, &sx
->conn_args
, sx
->addrlist
, &tls_out
, &tls_errstr
))
2455 /* TLS negotiation failed; give an error. From outside, this function may
2456 be called again to try in clear on a new connection, if the options permit
2457 it for this host. */
2461 DEBUG(D_tls
) debug_printf("TLS session fail: %s\n", tls_errstr
);
2463 # ifdef SUPPORT_DANE
2464 if (sx
->conn_args
.dane
)
2466 log_write(0, LOG_MAIN
,
2467 "DANE attempt failed; TLS connection to %s [%s]: %s",
2468 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, tls_errstr
);
2469 # ifndef DISABLE_EVENT
2470 (void) event_raise(sx
->conn_args
.tblock
->event_action
,
2471 US
"dane:fail", US
"validation-failure"); /* could do with better detail */
2476 errno
= ERRNO_TLSFAILURE
;
2477 message
= string_sprintf("TLS session: %s", tls_errstr
);
2478 sx
->send_quit
= FALSE
;
2482 /* TLS session is set up */
2484 smtp_peer_options_wrap
= smtp_peer_options
;
2485 for (address_item
* addr
= sx
->addrlist
; addr
; addr
= addr
->next
)
2486 if (addr
->transport_return
== PENDING_DEFER
)
2488 addr
->cipher
= tls_out
.cipher
;
2489 addr
->ourcert
= tls_out
.ourcert
;
2490 addr
->peercert
= tls_out
.peercert
;
2491 addr
->peerdn
= tls_out
.peerdn
;
2492 addr
->ocsp
= tls_out
.ocsp
;
2493 addr
->tlsver
= tls_out
.ver
;
2498 /* if smtps, we'll have smtp_command set to something else; always safe to
2500 smtp_command
= big_buffer
;
2502 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2503 helo_data is null, we are dealing with a connection that was passed from
2504 another process, and so we won't have expanded helo_data above. We have to
2505 expand it here. $sending_ip_address and $sending_port are set up right at the
2506 start of the Exim process (in exim.c). */
2508 if (tls_out
.active
.sock
>= 0)
2510 uschar
* greeting_cmd
;
2512 if (!sx
->helo_data
&& !(sx
->helo_data
= expand_string(ob
->helo_data
)))
2514 uschar
*message
= string_sprintf("failed to expand helo_data: %s",
2515 expand_string_message
);
2516 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2521 #ifdef SUPPORT_PIPE_CONNECT
2522 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2523 We're unlikely to get the group sent and delivered before the server sends its
2524 banner, but it's still worth sending as a group.
2525 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2528 if (sx
->smtps
? sx
->early_pipe_ok
: sx
->early_pipe_active
)
2530 sx
->peer_offered
= sx
->ehlo_resp
.crypted_features
;
2531 if ((sx
->early_pipe_active
=
2532 !!(sx
->ehlo_resp
.crypted_features
& OPTION_EARLY_PIPE
)))
2533 DEBUG(D_transport
) debug_printf("Using cached crypted PIPE_CONNECT\n");
2537 /* For SMTPS we need to wait for the initial OK response. */
2539 #ifdef SUPPORT_PIPE_CONNECT
2540 if (sx
->early_pipe_active
)
2542 sx
->pending_BANNER
= TRUE
;
2543 sx
->outblock
.cmd_count
= 1;
2547 if (!smtp_reap_banner(sx
))
2548 goto RESPONSE_FAILED
;
2551 greeting_cmd
= US
"LHLO";
2553 greeting_cmd
= US
"EHLO";
2556 greeting_cmd
= US
"HELO";
2558 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2561 if (smtp_write_command(sx
,
2562 #ifdef SUPPORT_PIPE_CONNECT
2563 sx
->early_pipe_active
? SCMD_BUFFER
:
2566 "%s %s\r\n", greeting_cmd
, sx
->helo_data
) < 0)
2569 #ifdef SUPPORT_PIPE_CONNECT
2570 if (sx
->early_pipe_active
)
2571 sx
->pending_EHLO
= TRUE
;
2575 if (!smtp_reap_ehlo(sx
))
2578 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2579 cert late, under TLS1.3 - which means here; the first time we try to
2580 receive crypted data. Treat it as if it was a connect-time failure.
2581 See also the early-pipe equivalent... which will be hard; every call
2582 to sync_responses will need to check the result.
2583 It would be nicer to have GnuTLS check the cert during the handshake.
2584 Can it do that, with all the flexibility we need? */
2586 tls_errstr
= US
"error on first read";
2587 goto GNUTLS_CONN_FAILED
;
2590 goto RESPONSE_FAILED
;
2592 smtp_peer_options
= 0;
2596 /* If the host is required to use a secure channel, ensure that we
2600 # ifdef SUPPORT_DANE
2601 || sx
->conn_args
.dane
2603 || verify_check_given_host(CUSS
&ob
->hosts_require_tls
, sx
->conn_args
.host
) == OK
2606 errno
= ERRNO_TLSREQUIRED
;
2607 message
= string_sprintf("a TLS session is required, but %s",
2608 smtp_peer_options
& OPTION_TLS
2609 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2610 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2611 if (sx
->conn_args
.dane
)
2612 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"dane:fail",
2613 smtp_peer_options
& OPTION_TLS
2614 ? US
"validation-failure" /* could do with better detail */
2615 : US
"starttls-not-supported");
2619 #endif /*DISABLE_TLS*/
2621 /* If TLS is active, we have just started it up and re-done the EHLO command,
2622 so its response needs to be analyzed. If TLS is not active and this is a
2623 continued session down a previously-used socket, we haven't just done EHLO, so
2626 if (continue_hostname
== NULL
2628 || tls_out
.active
.sock
>= 0
2632 if (sx
->esmtp
|| sx
->lmtp
)
2634 #ifdef SUPPORT_PIPE_CONNECT
2635 if (!sx
->early_pipe_active
)
2638 sx
->peer_offered
= ehlo_response(sx
->buffer
,
2640 #ifdef SUPPORT_PIPE_CONNECT
2641 | (sx
->lmtp
&& ob
->lmtp_ignore_quota
? OPTION_IGNQ
: 0)
2642 | OPTION_DSN
| OPTION_PIPE
| OPTION_SIZE
2643 | OPTION_CHUNKING
| OPTION_PRDR
| OPTION_UTF8
2644 | (tls_out
.active
.sock
>= 0 ? OPTION_EARLY_PIPE
: 0) /* not for lmtp */
2648 | (sx
->lmtp
&& ob
->lmtp_ignore_quota
? OPTION_IGNQ
: 0)
2651 # ifdef SUPPORT_I18N
2652 | (sx
->addrlist
->prop
.utf8_msg
? OPTION_UTF8
: 0)
2653 /*XXX if we hand peercaps on to continued-conn processes,
2654 must not depend on this addr */
2658 | (ob
->size_addition
>= 0 ? OPTION_SIZE
: 0)
2661 #ifdef SUPPORT_PIPE_CONNECT
2662 if (tls_out
.active
.sock
>= 0)
2663 sx
->ehlo_resp
.crypted_features
= sx
->peer_offered
;
2667 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2668 lmtp_ignore_quota option was set. */
2670 sx
->igquotstr
= sx
->peer_offered
& OPTION_IGNQ
? US
" IGNOREQUOTA" : US
"";
2672 /* If the response to EHLO specified support for the SIZE parameter, note
2673 this, provided size_addition is non-negative. */
2675 smtp_peer_options
|= sx
->peer_offered
& OPTION_SIZE
;
2677 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2678 the current host, esmtp will be false, so PIPELINING can never be used. If
2679 the current host matches hosts_avoid_pipelining, don't do it. */
2681 if ( sx
->peer_offered
& OPTION_PIPE
2682 && verify_check_given_host(CUSS
&ob
->hosts_avoid_pipelining
, sx
->conn_args
.host
) != OK
)
2683 smtp_peer_options
|= OPTION_PIPE
;
2685 DEBUG(D_transport
) debug_printf("%susing PIPELINING\n",
2686 smtp_peer_options
& OPTION_PIPE
? "" : "not ");
2688 if ( sx
->peer_offered
& OPTION_CHUNKING
2689 && verify_check_given_host(CUSS
&ob
->hosts_try_chunking
, sx
->conn_args
.host
) != OK
)
2690 sx
->peer_offered
&= ~OPTION_CHUNKING
;
2692 if (sx
->peer_offered
& OPTION_CHUNKING
)
2693 DEBUG(D_transport
) debug_printf("CHUNKING usable\n");
2695 #ifndef DISABLE_PRDR
2696 if ( sx
->peer_offered
& OPTION_PRDR
2697 && verify_check_given_host(CUSS
&ob
->hosts_try_prdr
, sx
->conn_args
.host
) != OK
)
2698 sx
->peer_offered
&= ~OPTION_PRDR
;
2700 if (sx
->peer_offered
& OPTION_PRDR
)
2701 DEBUG(D_transport
) debug_printf("PRDR usable\n");
2704 /* Note if the server supports DSN */
2705 smtp_peer_options
|= sx
->peer_offered
& OPTION_DSN
;
2706 DEBUG(D_transport
) debug_printf("%susing DSN\n",
2707 sx
->peer_offered
& OPTION_DSN
? "" : "not ");
2709 #ifdef SUPPORT_PIPE_CONNECT
2710 if ( sx
->early_pipe_ok
2711 && !sx
->early_pipe_active
2712 && tls_out
.active
.sock
>= 0
2713 && smtp_peer_options
& OPTION_PIPE
2714 && ( sx
->ehlo_resp
.cleartext_features
| sx
->ehlo_resp
.crypted_features
)
2715 & OPTION_EARLY_PIPE
)
2717 DEBUG(D_transport
) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2718 sx
->ehlo_resp
.crypted_auths
= study_ehlo_auths(sx
);
2719 write_ehlo_cache_entry(sx
);
2723 /* Note if the response to EHLO specifies support for the AUTH extension.
2724 If it has, check that this host is one we want to authenticate to, and do
2725 the business. The host name and address must be available when the
2726 authenticator's client driver is running. */
2728 switch (yield
= smtp_auth(sx
))
2730 default: goto SEND_QUIT
;
2732 case FAIL_SEND
: goto SEND_FAILED
;
2733 case FAIL
: goto RESPONSE_FAILED
;
2737 sx
->pipelining_used
= pipelining_active
= !!(smtp_peer_options
& OPTION_PIPE
);
2739 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2740 message-specific. */
2742 sx
->setting_up
= FALSE
;
2745 if (sx
->addrlist
->prop
.utf8_msg
)
2749 /* If the transport sets a downconversion mode it overrides any set by ACL
2752 if ((s
= ob
->utf8_downconvert
))
2754 if (!(s
= expand_string(s
)))
2756 message
= string_sprintf("failed to expand utf8_downconvert: %s",
2757 expand_string_message
);
2758 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, message
, DEFER
, FALSE
);
2764 case '1': sx
->addrlist
->prop
.utf8_downcvt
= TRUE
;
2765 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2767 case '0': sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2768 sx
->addrlist
->prop
.utf8_downcvt_maybe
= FALSE
;
2770 case '-': if (s
[1] == '1')
2772 sx
->addrlist
->prop
.utf8_downcvt
= FALSE
;
2773 sx
->addrlist
->prop
.utf8_downcvt_maybe
= TRUE
;
2779 sx
->utf8_needed
= !sx
->addrlist
->prop
.utf8_downcvt
2780 && !sx
->addrlist
->prop
.utf8_downcvt_maybe
;
2781 DEBUG(D_transport
) if (!sx
->utf8_needed
)
2782 debug_printf("utf8: %s downconvert\n",
2783 sx
->addrlist
->prop
.utf8_downcvt
? "mandatory" : "optional");
2786 /* If this is an international message we need the host to speak SMTPUTF8 */
2787 if (sx
->utf8_needed
&& !(sx
->peer_offered
& OPTION_UTF8
))
2789 errno
= ERRNO_UTF8_FWD
;
2790 goto RESPONSE_FAILED
;
2792 #endif /*SUPPORT_I18N*/
2801 if (errno
== ECONNREFUSED
) /* first-read error on a TFO conn */
2803 /* There is a testing facility for simulating a connection timeout, as I
2804 can't think of any other way of doing this. It converts a connection
2805 refused into a timeout if the timeout is set to 999999. This is done for
2806 a 3whs connection in ip_connect(), but a TFO connection does not error
2807 there - instead it gets ECONNREFUSED on the first data read. Tracking
2808 that a TFO really was done is too hard, or we would set a
2809 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2810 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2813 if (f
.running_in_test_harness
&& ob
->connect_timeout
== 999999)
2815 set_errno_nohost(sx
->addrlist
,
2816 errno
== ETIMEDOUT
? ERRNO_CONNECTTIMEOUT
: errno
,
2817 sx
->verify
? US
strerror(errno
) : NULL
,
2819 sx
->send_quit
= FALSE
;
2823 /* really an error on an SMTP read */
2825 sx
->send_quit
= check_response(sx
->conn_args
.host
, &errno
, sx
->addrlist
->more_errno
,
2826 sx
->buffer
, &code
, &message
, &pass_message
);
2832 message
= US
string_sprintf("send() to %s [%s] failed: %s",
2833 sx
->conn_args
.host
->name
, sx
->conn_args
.host
->address
, strerror(errno
));
2834 sx
->send_quit
= FALSE
;
2840 message
= string_sprintf("Remote host closed connection in response to %s"
2841 " (EHLO response was: %s)", smtp_command
, sx
->buffer
);
2842 sx
->send_quit
= FALSE
;
2846 /* This label is jumped to directly when a TLS negotiation has failed,
2847 or was not done for a host for which it is required. Values will be set
2848 in message and errno, and setting_up will always be true. Treat as
2849 a temporary error. */
2853 code
= '4', yield
= DEFER
;
2857 /* The failure happened while setting up the call; see if the failure was
2858 a 5xx response (this will either be on connection, or following HELO - a 5xx
2859 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2860 fail all addresses, as this host is never going to accept them. For other
2861 errors during setting up (timeouts or whatever), defer all addresses, and
2862 yield DEFER, so that the host is not tried again for a while.
2864 XXX This peeking for another host feels like a layering violation. We want
2865 to note the host as unusable, but down here we shouldn't know if this was
2866 the last host to try for the addr(list). Perhaps the upper layer should be
2867 the one to do set_errno() ? The problem is that currently the addr is where
2868 errno etc. are stashed, but until we run out of hosts to try the errors are
2869 host-specific. Maybe we should enhance the host_item definition? */
2872 sx
->ok
= FALSE
; /* For when reached by GOTO */
2873 set_errno(sx
->addrlist
, errno
, message
,
2874 sx
->conn_args
.host
->next
2878 || errno
== ERRNO_UTF8_FWD
2882 errno
== ECONNREFUSED
? NULL
: sx
->conn_args
.host
2883 #ifdef EXPERIMENTAL_DSN_INFO
2884 , sx
->smtp_greeting
, sx
->helo_response
2893 (void)smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n");
2896 if (sx
->cctx
.tls_ctx
)
2898 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
2899 sx
->cctx
.tls_ctx
= NULL
;
2903 /* Close the socket, and return the appropriate value, first setting
2904 works because the NULL setting is passed back to the calling process, and
2905 remote_max_parallel is forced to 1 when delivering over an existing connection,
2908 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
2911 shutdown(sx
->cctx
.sock
, SHUT_WR
);
2912 if (fcntl(sx
->cctx
.sock
, F_SETFL
, O_NONBLOCK
) == 0)
2913 for (int i
= 16; read(sx
->cctx
.sock
, sx
->inbuffer
, sizeof(sx
->inbuffer
)) > 0 && i
> 0;)
2914 i
--; /* drain socket */
2915 sx
->send_quit
= FALSE
;
2917 (void)close(sx
->cctx
.sock
);
2920 #ifndef DISABLE_EVENT
2921 (void) event_raise(sx
->conn_args
.tblock
->event_action
, US
"tcp:close", NULL
);
2924 continue_transport
= NULL
;
2925 continue_hostname
= NULL
;
2932 /* Create the string of options that will be appended to the MAIL FROM:
2933 in the connection context buffer */
2936 build_mailcmd_options(smtp_context
* sx
, address_item
* addrlist
)
2938 uschar
* p
= sx
->buffer
;
2939 address_item
* addr
;
2944 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2945 send it, adding something to the message size to allow for imprecision
2946 and things that get added en route. Exim keeps the number of lines
2947 in a message, so we can give an accurate value for the original message, but we
2948 need some additional to handle added headers. (Double "." characters don't get
2949 included in the count.) */
2951 if ( message_size
> 0
2952 && sx
->peer_offered
& OPTION_SIZE
&& !(sx
->avoid_option
& OPTION_SIZE
))
2954 /*XXX problem here under spool_files_wireformat?
2955 Or just forget about lines? Or inflate by a fixed proportion? */
2957 sprintf(CS p
, " SIZE=%d", message_size
+message_linecount
+(SOB sx
->conn_args
.ob
)->size_addition
);
2961 #ifndef DISABLE_PRDR
2962 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2965 sx
->prdr_active
= FALSE
;
2966 if (sx
->peer_offered
& OPTION_PRDR
)
2967 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
2968 if (addr
->transport_return
== PENDING_DEFER
)
2970 for (addr
= addr
->next
; addr
; addr
= addr
->next
)
2971 if (addr
->transport_return
== PENDING_DEFER
)
2972 { /* at least two recipients to send */
2973 sx
->prdr_active
= TRUE
;
2974 sprintf(CS p
, " PRDR"); p
+= 5;
2982 /* If it supports internationalised messages, and this meesage need that,
2985 if ( sx
->peer_offered
& OPTION_UTF8
2986 && addrlist
->prop
.utf8_msg
2987 && !addrlist
->prop
.utf8_downcvt
2989 Ustrcpy(p
, US
" SMTPUTF8"), p
+= 9;
2992 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2993 for (sx
->dsn_all_lasthop
= TRUE
, addr
= addrlist
, address_count
= 0;
2994 addr
&& address_count
< sx
->max_rcpt
;
2995 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
2998 if (!(addr
->dsn_flags
& rf_dsnlasthop
))
3000 sx
->dsn_all_lasthop
= FALSE
;
3005 /* Add any DSN flags to the mail command */
3007 if (sx
->peer_offered
& OPTION_DSN
&& !sx
->dsn_all_lasthop
)
3009 if (dsn_ret
== dsn_ret_hdrs
)
3010 { Ustrcpy(p
, US
" RET=HDRS"); p
+= 9; }
3011 else if (dsn_ret
== dsn_ret_full
)
3012 { Ustrcpy(p
, US
" RET=FULL"); p
+= 9; }
3016 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ENVID=%s", dsn_envid
);
3021 /* If an authenticated_sender override has been specified for this transport
3022 instance, expand it. If the expansion is forced to fail, and there was already
3023 an authenticated_sender for this message, the original value will be used.
3024 Other expansion failures are serious. An empty result is ignored, but there is
3025 otherwise no check - this feature is expected to be used with LMTP and other
3026 cases where non-standard addresses (e.g. without domains) might be required. */
3028 if (smtp_mail_auth_str(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), addrlist
, sx
->conn_args
.ob
))
3036 build_rcptcmd_options(smtp_context
* sx
, const address_item
* addr
)
3038 uschar
* p
= sx
->buffer
;
3041 /* Add any DSN flags to the rcpt command */
3043 if (sx
->peer_offered
& OPTION_DSN
&& !(addr
->dsn_flags
& rf_dsnlasthop
))
3045 if (addr
->dsn_flags
& rf_dsnflags
)
3049 Ustrcpy(p
, US
" NOTIFY=");
3051 for (int i
= 0; i
< nelem(rf_list
); i
++) if (addr
->dsn_flags
& rf_list
[i
])
3053 if (!first
) *p
++ = ',';
3055 Ustrcpy(p
, rf_names
[i
]);
3060 if (addr
->dsn_orcpt
)
3062 string_format(p
, sizeof(sx
->buffer
) - (p
-sx
->buffer
), " ORCPT=%s",
3073 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3074 -1 MAIL response error
3075 -2 any non-MAIL read i/o error
3076 -3 non-MAIL response timeout
3077 -4 internal error; channel still usable
3082 smtp_write_mail_and_rcpt_cmds(smtp_context
* sx
, int * yield
)
3084 address_item
* addr
;
3088 if (build_mailcmd_options(sx
, sx
->first_addr
) != OK
)
3094 /* From here until we send the DATA command, we can make use of PIPELINING
3095 if the server host supports it. The code has to be able to check the responses
3096 at any point, for when the buffer fills up, so we write it totally generally.
3097 When PIPELINING is off, each command written reports that it has flushed the
3100 sx
->pending_MAIL
= TRUE
; /* The block starts with MAIL */
3103 uschar
* s
= sx
->from_addr
;
3105 uschar
* errstr
= NULL
;
3107 /* If we must downconvert, do the from-address here. Remember we had to
3108 for the to-addresses (done below), and also (ugly) for re-doing when building
3109 the delivery log line. */
3111 if ( sx
->addrlist
->prop
.utf8_msg
3112 && (sx
->addrlist
->prop
.utf8_downcvt
|| !(sx
->peer_offered
& OPTION_UTF8
))
3115 if (s
= string_address_utf8_to_alabel(s
, &errstr
), errstr
)
3117 set_errno_nohost(sx
->addrlist
, ERRNO_EXPANDFAIL
, errstr
, DEFER
, FALSE
);
3121 setflag(sx
->addrlist
, af_utf8_downcvt
);
3125 rc
= smtp_write_command(sx
, pipelining_active
? SCMD_BUFFER
: SCMD_FLUSH
,
3126 "MAIL FROM:<%s>%s\r\n", s
, sx
->buffer
);
3129 mail_command
= string_copy(big_buffer
); /* Save for later error message */
3133 case -1: /* Transmission error */
3136 case +1: /* Cmd was sent */
3137 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3138 (SOB sx
->conn_args
.ob
)->command_timeout
))
3140 if (errno
== 0 && sx
->buffer
[0] == '4')
3142 errno
= ERRNO_MAIL4XX
;
3143 sx
->addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3147 sx
->pending_MAIL
= FALSE
;
3150 /* otherwise zero: command queued for pipeline */
3153 /* Pass over all the relevant recipient addresses for this host, which are the
3154 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3155 several before we have to read the responses for those seen so far. This
3156 checking is done by a subroutine because it also needs to be done at the end.
3157 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3158 the next one if not all are sent.
3160 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3161 last address because we want to abort if any recipients have any kind of
3162 problem, temporary or permanent. We know that all recipient addresses will have
3163 the PENDING_DEFER status, because only one attempt is ever made, and we know
3164 that max_rcpt will be large, so all addresses will be done at once.
3166 For verify we flush the pipeline after any (the only) rcpt address. */
3168 for (addr
= sx
->first_addr
, address_count
= 0;
3169 addr
&& address_count
< sx
->max_rcpt
;
3170 addr
= addr
->next
) if (addr
->transport_return
== PENDING_DEFER
)
3176 addr
->dsn_aware
= sx
->peer_offered
& OPTION_DSN
3177 ? dsn_support_yes
: dsn_support_no
;
3180 no_flush
= pipelining_active
&& !sx
->verify
3181 && (!mua_wrapper
|| addr
->next
&& address_count
< sx
->max_rcpt
);
3183 build_rcptcmd_options(sx
, addr
);
3185 /* Now send the RCPT command, and process outstanding responses when
3186 necessary. After a timeout on RCPT, we just end the function, leaving the
3187 yield as OK, because this error can often mean that there is a problem with
3188 just one address, so we don't want to delay the host. */
3190 rcpt_addr
= transport_rcpt_address(addr
, sx
->conn_args
.tblock
->rcpt_include_affixes
);
3193 if ( testflag(sx
->addrlist
, af_utf8_downcvt
)
3194 && !(rcpt_addr
= string_address_utf8_to_alabel(rcpt_addr
, NULL
))
3197 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3198 errno
= ERRNO_EXPANDFAIL
;
3199 return -5; /*XXX too harsh? */
3203 count
= smtp_write_command(sx
, no_flush
? SCMD_BUFFER
: SCMD_FLUSH
,
3204 "RCPT TO:<%s>%s%s\r\n", rcpt_addr
, sx
->igquotstr
, sx
->buffer
);
3206 if (count
< 0) return -5;
3209 switch(sync_responses(sx
, count
, 0))
3211 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3212 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3215 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3216 if (!sx
->lmtp
) /* can't tell about progress yet */
3217 sx
->completed_addr
= TRUE
;
3218 case 0: /* No 2xx or 5xx, but no probs */
3221 case -1: return -3; /* Timeout on RCPT */
3222 case -2: return -2; /* non-MAIL read i/o error */
3223 default: return -1; /* any MAIL error */
3225 #ifdef SUPPORT_PIPE_CONNECT
3226 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3227 case -5: return -1; /* TLS first-read error */
3230 sx
->pending_MAIL
= FALSE
; /* Dealt with MAIL */
3232 } /* Loop for next address */
3234 sx
->next_addr
= addr
;
3240 /*****************************************************
3241 * Proxy TLS connection for another transport process *
3242 ******************************************************/
3244 Close the unused end of the pipe, fork once more, then use the given buffer
3245 as a staging area, and select on both the given fd and the TLS'd client-fd for
3246 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3247 Do blocking full-size writes, and reads under a timeout. Once both input
3248 channels are closed, exit the process.
3252 buf space to use for buffering
3253 bufsiz size of buffer
3254 pfd pipe filedescriptor array; [0] is comms to proxied process
3255 timeout per-read timeout, seconds
3261 smtp_proxy_tls(void * ct_ctx
, uschar
* buf
, size_t bsize
, int * pfd
,
3265 int max_fd
= MAX(pfd
[0], tls_out
.active
.sock
) + 1;
3271 DEBUG(D_transport
) debug_printf("proxy-proc final-pid %d\n", rc
);
3272 _exit(rc
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
);
3275 testharness_pause_ms(100); /* let parent debug out */
3276 set_process_info("proxying TLS connection for continued transport");
3278 FD_SET(tls_out
.active
.sock
, &rfds
);
3279 FD_SET(pfd
[0], &rfds
);
3281 for (int fd_bits
= 3; fd_bits
; )
3283 time_t time_left
= timeout
;
3284 time_t time_start
= time(NULL
);
3290 struct timeval tv
= { time_left
, 0 };
3293 (SELECT_ARG2_TYPE
*)&rfds
, NULL
, (SELECT_ARG2_TYPE
*)&efds
, &tv
);
3295 if (rc
< 0 && errno
== EINTR
)
3296 if ((time_left
-= time(NULL
) - time_start
) > 0) continue;
3300 DEBUG(D_transport
) if (rc
== 0) debug_printf("%s: timed out\n", __FUNCTION__
);
3304 if (FD_ISSET(tls_out
.active
.sock
, &efds
) || FD_ISSET(pfd
[0], &efds
))
3306 DEBUG(D_transport
) debug_printf("select: exceptional cond on %s fd\n",
3307 FD_ISSET(pfd
[0], &efds
) ? "proxy" : "tls");
3311 while (rc
< 0 || !(FD_ISSET(tls_out
.active
.sock
, &rfds
) || FD_ISSET(pfd
[0], &rfds
)));
3313 /* handle inbound data */
3314 if (FD_ISSET(tls_out
.active
.sock
, &rfds
))
3315 if ((rc
= tls_read(ct_ctx
, buf
, bsize
)) <= 0)
3318 FD_CLR(tls_out
.active
.sock
, &rfds
);
3319 shutdown(pfd
[0], SHUT_WR
);
3324 for (int nbytes
= 0; rc
- nbytes
> 0; nbytes
+= i
)
3325 if ((i
= write(pfd
[0], buf
+ nbytes
, rc
- nbytes
)) < 0) goto done
;
3327 else if (fd_bits
& 1)
3328 FD_SET(tls_out
.active
.sock
, &rfds
);
3330 /* handle outbound data */
3331 if (FD_ISSET(pfd
[0], &rfds
))
3332 if ((rc
= read(pfd
[0], buf
, bsize
)) <= 0)
3335 tls_close(ct_ctx
, TLS_SHUTDOWN_NOWAIT
);
3340 for (int nbytes
= 0; rc
- nbytes
> 0; nbytes
+= i
)
3341 if ((i
= tls_write(ct_ctx
, buf
+ nbytes
, rc
- nbytes
, FALSE
)) < 0)
3344 else if (fd_bits
& 2)
3345 FD_SET(pfd
[0], &rfds
);
3349 testharness_pause_ms(100); /* let logging complete */
3350 exim_exit(0, US
"TLS proxy");
3355 /*************************************************
3356 * Deliver address list to given host *
3357 *************************************************/
3359 /* If continue_hostname is not null, we get here only when continuing to
3360 deliver down an existing channel. The channel was passed as the standard
3361 input. TLS is never active on a passed channel; the previous process always
3362 closes it down before passing the connection on.
3364 Otherwise, we have to make a connection to the remote host, and do the
3365 initial protocol exchange.
3367 When running as an MUA wrapper, if the sender or any recipient is rejected,
3368 temporarily or permanently, we force failure for all recipients.
3371 addrlist chain of potential addresses to deliver; only those whose
3372 transport_return field is set to PENDING_DEFER are currently
3373 being processed; others should be skipped - they have either
3374 been delivered to an earlier host or IP address, or been
3375 failed by one of them.
3376 host host to deliver to
3377 host_af AF_INET or AF_INET6
3378 defport default TCP/IP port to use if host does not specify, in host
3380 interface interface to bind to, or NULL
3381 tblock transport instance block
3382 message_defer set TRUE if yield is OK, but all addresses were deferred
3383 because of a non-recipient, non-host failure, that is, a
3384 4xx response to MAIL FROM, DATA, or ".". This is a defer
3385 that is specific to the message.
3386 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3387 a second attempt after TLS initialization fails
3389 Returns: OK - the connection was made and the delivery attempted;
3390 the result for each address is in its data block.
3391 DEFER - the connection could not be made, or something failed
3392 while setting up the SMTP session, or there was a
3393 non-message-specific error, such as a timeout.
3394 ERROR - a filter command is specified for this transport,
3395 and there was a problem setting it up; OR helo_data
3396 or add_headers or authenticated_sender is specified
3397 for this transport, and the string failed to expand
3401 smtp_deliver(address_item
*addrlist
, host_item
*host
, int host_af
, int defport
,
3402 uschar
*interface
, transport_instance
*tblock
,
3403 BOOL
*message_defer
, BOOL suppress_tls
)
3405 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
3409 struct timeval start_delivery_time
;
3411 BOOL pass_message
= FALSE
;
3412 uschar
*message
= NULL
;
3413 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 memset(sx
, 0, sizeof(*sx
));
3421 sx
->addrlist
= addrlist
;
3422 sx
->conn_args
.host
= host
;
3423 sx
->conn_args
.host_af
= host_af
,
3425 sx
->conn_args
.interface
= interface
;
3426 sx
->helo_data
= NULL
;
3427 sx
->conn_args
.tblock
= tblock
;
3428 /* sx->verify = FALSE; */
3429 sx
->sync_addr
= sx
->first_addr
= addrlist
;
3431 /* Get the channel set up ready for a message (MAIL FROM being the next
3432 SMTP command to send */
3434 if ((rc
= smtp_setup_conn(sx
, suppress_tls
)) != OK
)
3437 /* If there is a filter command specified for this transport, we can now
3438 set it up. This cannot be done until the identify of the host is known. */
3440 if (tblock
->filter_command
)
3442 transport_filter_timeout
= tblock
->filter_timeout
;
3444 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3447 if (!transport_set_up_command(&transport_filter_argv
,
3448 tblock
->filter_command
, TRUE
, DEFER
, addrlist
,
3449 string_sprintf("%.50s transport", tblock
->name
), NULL
))
3451 set_errno_nohost(addrlist
->next
, addrlist
->basic_errno
, addrlist
->message
, DEFER
,
3457 if ( transport_filter_argv
3458 && *transport_filter_argv
3459 && **transport_filter_argv
3460 && sx
->peer_offered
& OPTION_CHUNKING
3463 sx
->peer_offered
&= ~OPTION_CHUNKING
;
3464 DEBUG(D_transport
) debug_printf("CHUNKING not usable due to transport filter\n");
3468 /* For messages that have more than the maximum number of envelope recipients,
3469 we want to send several transactions down the same SMTP connection. (See
3470 comments in deliver.c as to how this reconciles, heuristically, with
3471 remote_max_parallel.) This optimization was added to Exim after the following
3472 code was already working. The simplest way to put it in without disturbing the
3473 code was to use a goto to jump back to this point when there is another
3474 transaction to handle. */
3477 sx
->from_addr
= return_path
;
3478 sx
->sync_addr
= sx
->first_addr
;
3480 sx
->send_rset
= TRUE
;
3481 sx
->completed_addr
= FALSE
;
3484 /* If we are a continued-connection-after-verify the MAIL and RCPT
3485 commands were already sent; do not re-send but do mark the addrs as
3486 having been accepted up to RCPT stage. A traditional cont-conn
3487 always has a sequence number greater than one. */
3489 if (continue_hostname
&& continue_sequence
== 1)
3491 sx
->peer_offered
= smtp_peer_options
;
3492 /* sx->pending_MAIL = FALSE; */
3494 /* sx->next_addr = NULL; */
3496 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
3497 addr
->transport_return
= PENDING_OK
;
3501 /* Initiate a message transfer. */
3503 switch(smtp_write_mail_and_rcpt_cmds(sx
, &yield
))
3506 case -1: case -2: goto RESPONSE_FAILED
;
3507 case -3: goto END_OFF
;
3508 case -4: goto SEND_QUIT
;
3509 default: goto SEND_FAILED
;
3512 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3513 permanently or temporarily. We should have flushed and synced after the last
3521 for (a
= sx
->first_addr
, cnt
= 0; a
&& cnt
< sx
->max_rcpt
; a
= a
->next
, cnt
++)
3522 if (a
->transport_return
!= PENDING_OK
)
3524 /*XXX could we find a better errno than 0 here? */
3525 set_errno_nohost(addrlist
, 0, a
->message
, FAIL
,
3526 testflag(a
, af_pass_message
));
3533 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3534 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3535 have a good recipient buffered up if we are pipelining. We don't want to waste
3536 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3537 are pipelining. The responses are all handled by sync_responses().
3538 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3541 if ( !(sx
->peer_offered
& OPTION_CHUNKING
)
3542 && (sx
->ok
|| (pipelining_active
&& !mua_wrapper
)))
3544 int count
= smtp_write_command(sx
, SCMD_FLUSH
, "DATA\r\n");
3546 if (count
< 0) goto SEND_FAILED
;
3547 switch(sync_responses(sx
, count
, sx
->ok
? +1 : -1))
3549 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3550 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3553 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3554 if (!sx
->lmtp
) sx
->completed_addr
= TRUE
; /* can't tell about progress yet */
3555 case 0: break; /* No 2xx or 5xx, but no probs */
3557 case -1: goto END_OFF
; /* Timeout on RCPT */
3559 #ifdef SUPPORT_PIPE_CONNECT
3560 case -5: /* TLS first-read error */
3561 case -4: HDEBUG(D_transport
)
3562 debug_printf("failed reaping pipelined cmd responses\n");
3564 default: goto RESPONSE_FAILED
; /* I/O error, or any MAIL/DATA error */
3566 pipelining_active
= FALSE
;
3567 data_command
= string_copy(big_buffer
); /* Save for later error message */
3570 /* If there were no good recipients (but otherwise there have been no
3571 problems), just set ok TRUE, since we have handled address-specific errors
3572 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3573 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3574 well as body. Set the appropriate timeout value to be used for each chunk.
3575 (Haven't been able to make it work using select() for writing yet.) */
3578 && (!(sx
->peer_offered
& OPTION_CHUNKING
) || !pipelining_active
))
3580 /* Save the first address of the next batch. */
3581 sx
->first_addr
= sx
->next_addr
;
3587 transport_ctx tctx
= {
3588 .u
= {.fd
= sx
->cctx
.sock
}, /*XXX will this need TLS info? */
3591 .check_string
= US
".",
3592 .escape_string
= US
"..", /* Escaping strings */
3594 topt_use_crlf
| topt_escape_headers
3595 | (tblock
->body_only
? topt_no_headers
: 0)
3596 | (tblock
->headers_only
? topt_no_body
: 0)
3597 | (tblock
->return_path_add
? topt_add_return_path
: 0)
3598 | (tblock
->delivery_date_add
? topt_add_delivery_date
: 0)
3599 | (tblock
->envelope_to_add
? topt_add_envelope_to
: 0)
3602 /* If using CHUNKING we need a callback from the generic transport
3603 support to us, for the sending of BDAT smtp commands and the reaping
3604 of responses. The callback needs a whole bunch of state so set up
3605 a transport-context structure to be passed around. */
3607 if (sx
->peer_offered
& OPTION_CHUNKING
)
3609 tctx
.check_string
= tctx
.escape_string
= NULL
;
3610 tctx
.options
|= topt_use_bdat
;
3611 tctx
.chunk_cb
= smtp_chunk_cmd_callback
;
3612 sx
->pending_BDAT
= FALSE
;
3613 sx
->good_RCPT
= sx
->ok
;
3615 tctx
.smtp_context
= sx
;
3618 tctx
.options
|= topt_end_dot
;
3620 /* Save the first address of the next batch. */
3621 sx
->first_addr
= sx
->next_addr
;
3623 /* Responses from CHUNKING commands go in buffer. Otherwise,
3624 there has not been a response. */
3628 sigalrm_seen
= FALSE
;
3629 transport_write_timeout
= ob
->data_timeout
;
3630 smtp_command
= US
"sending data block"; /* For error messages */
3631 DEBUG(D_transport
|D_v
)
3632 if (sx
->peer_offered
& OPTION_CHUNKING
)
3633 debug_printf(" will write message using CHUNKING\n");
3635 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3636 transport_count
= 0;
3638 #ifndef DISABLE_DKIM
3640 # ifdef MEASURE_TIMING
3642 gettimeofday(&t0
, NULL
);
3644 dkim_exim_sign_init();
3645 # ifdef EXPERIMENTAL_ARC
3647 uschar
* s
= ob
->arc_sign
;
3650 if (!(ob
->dkim
.arc_signspec
= s
= expand_string(s
)))
3652 if (!f
.expand_string_forcedfail
)
3654 message
= US
"failed to expand arc_sign";
3661 /* Ask dkim code to hash the body for ARC */
3662 (void) arc_ams_setup_sign_bodyhash();
3663 ob
->dkim
.force_bodyhash
= TRUE
;
3668 # ifdef MEASURE_TIMING
3669 report_time_since(&t0
, US
"dkim_exim_sign_init (delta)");
3672 sx
->ok
= dkim_transport_write_message(&tctx
, &ob
->dkim
, CUSS
&message
);
3674 sx
->ok
= transport_write_message(&tctx
, 0);
3677 /* transport_write_message() uses write() because it is called from other
3678 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3679 it can exit with "Broken pipe" as its error. This really means that the
3680 socket got closed at the far end. */
3682 transport_write_timeout
= 0; /* for subsequent transports */
3684 /* Failure can either be some kind of I/O disaster (including timeout),
3685 or the failure of a transport filter or the expansion of added headers.
3686 Or, when CHUNKING, it can be a protocol-detected failure. */
3689 if (message
) goto SEND_FAILED
;
3690 else goto RESPONSE_FAILED
;
3692 /* We used to send the terminating "." explicitly here, but because of
3693 buffering effects at both ends of TCP/IP connections, you don't gain
3694 anything by keeping it separate, so it might as well go in the final
3695 data buffer for efficiency. This is now done by setting the topt_end_dot
3698 smtp_command
= US
"end of data";
3700 if (sx
->peer_offered
& OPTION_CHUNKING
&& sx
->cmd_count
> 1)
3702 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3703 switch(sync_responses(sx
, sx
->cmd_count
-1, 0))
3705 case 3: sx
->ok
= TRUE
; /* 2xx & 5xx => OK & progress made */
3706 case 2: sx
->completed_addr
= TRUE
; /* 5xx (only) => progress made */
3709 case 1: sx
->ok
= TRUE
; /* 2xx (only) => OK, but if LMTP, */
3710 if (!sx
->lmtp
) sx
->completed_addr
= TRUE
; /* can't tell about progress yet */
3711 case 0: break; /* No 2xx or 5xx, but no probs */
3713 case -1: goto END_OFF
; /* Timeout on RCPT */
3715 #ifdef SUPPORT_PIPE_CONNECT
3716 case -5: /* TLS first-read error */
3717 case -4: HDEBUG(D_transport
)
3718 debug_printf("failed reaping pipelined cmd responses\n");
3720 default: goto RESPONSE_FAILED
; /* I/O error, or any MAIL/DATA error */
3724 #ifndef DISABLE_PRDR
3725 /* For PRDR we optionally get a partial-responses warning followed by the
3726 individual responses, before going on with the overall response. If we don't
3727 get the warning then deal with per non-PRDR. */
3731 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '3', ob
->final_timeout
);
3732 if (!sx
->ok
&& errno
== 0) switch(sx
->buffer
[0])
3734 case '2': sx
->prdr_active
= FALSE
;
3737 case '4': errno
= ERRNO_DATA4XX
;
3738 addrlist
->more_errno
|=
3739 ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3746 /* For non-PRDR SMTP, we now read a single response that applies to the
3747 whole message. If it is OK, then all the addresses have been delivered. */
3751 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3753 if (!sx
->ok
&& errno
== 0 && sx
->buffer
[0] == '4')
3755 errno
= ERRNO_DATA4XX
;
3756 addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3760 /* For LMTP, we get back a response for every RCPT command that we sent;
3761 some may be accepted and some rejected. For those that get a response, their
3762 status is fixed; any that are accepted have been handed over, even if later
3763 responses crash - at least, that's how I read RFC 2033.
3765 If all went well, mark the recipient addresses as completed, record which
3766 host/IPaddress they were delivered to, and cut out RSET when sending another
3767 message down the same channel. Write the completed addresses to the journal
3768 now so that they are recorded in case there is a crash of hardware or
3769 software before the spool gets updated. Also record the final SMTP
3770 confirmation if needed (for SMTP only). */
3775 struct timeval delivery_time
;
3777 uschar
* conf
= NULL
;
3779 timesince(&delivery_time
, &start_delivery_time
);
3780 sx
->send_rset
= FALSE
;
3781 pipelining_active
= FALSE
;
3783 /* Set up confirmation if needed - applies only to SMTP */
3786 #ifdef DISABLE_EVENT
3787 LOGGING(smtp_confirmation
) &&
3792 const uschar
*s
= string_printing(sx
->buffer
);
3793 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3794 conf
= (s
== sx
->buffer
)? US
string_copy(s
) : US s
;
3797 /* Process all transported addresses - for LMTP or PRDR, read a status for
3800 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3802 if (addr
->transport_return
!= PENDING_OK
) continue;
3804 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3805 remaining addresses. Otherwise, it's a return code for just the one
3806 address. For temporary errors, add a retry item for the address so that
3807 it doesn't get tried again too soon. */
3809 #ifndef DISABLE_PRDR
3810 if (sx
->lmtp
|| sx
->prdr_active
)
3815 if (!smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3818 if (errno
!= 0 || sx
->buffer
[0] == 0) goto RESPONSE_FAILED
;
3819 addr
->message
= string_sprintf(
3820 #ifndef DISABLE_PRDR
3821 "%s error after %s: %s", sx
->prdr_active
? "PRDR":"LMTP",
3823 "LMTP error after %s: %s",
3825 data_command
, string_printing(sx
->buffer
));
3826 setflag(addr
, af_pass_message
); /* Allow message to go to user */
3827 if (sx
->buffer
[0] == '5')
3828 addr
->transport_return
= FAIL
;
3831 errno
= ERRNO_DATA4XX
;
3832 addr
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3833 addr
->transport_return
= DEFER
;
3834 #ifndef DISABLE_PRDR
3835 if (!sx
->prdr_active
)
3837 retry_add_item(addr
, addr
->address_retry_key
, 0);
3841 sx
->completed_addr
= TRUE
; /* NOW we can set this flag */
3842 if (LOGGING(smtp_confirmation
))
3844 const uschar
*s
= string_printing(sx
->buffer
);
3845 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3846 conf
= (s
== sx
->buffer
) ? US
string_copy(s
) : US s
;
3850 /* SMTP, or success return from LMTP for this address. Pass back the
3851 actual host that was used. */
3853 addr
->transport_return
= OK
;
3854 addr
->more_errno
= delivery_time
.tv_sec
;
3855 addr
->delivery_usec
= delivery_time
.tv_usec
;
3856 addr
->host_used
= host
;
3857 addr
->special_action
= flag
;
3858 addr
->message
= conf
;
3860 if (tcp_out_fastopen
)
3862 setflag(addr
, af_tcp_fastopen_conn
);
3863 if (tcp_out_fastopen
>= TFO_USED_NODATA
) setflag(addr
, af_tcp_fastopen
);
3864 if (tcp_out_fastopen
>= TFO_USED_DATA
) setflag(addr
, af_tcp_fastopen_data
);
3866 if (sx
->pipelining_used
) setflag(addr
, af_pipelining
);
3867 #ifdef SUPPORT_PIPE_CONNECT
3868 if (sx
->early_pipe_active
) setflag(addr
, af_early_pipe
);
3870 #ifndef DISABLE_PRDR
3871 if (sx
->prdr_active
) setflag(addr
, af_prdr_used
);
3873 if (sx
->peer_offered
& OPTION_CHUNKING
) setflag(addr
, af_chunking_used
);
3876 #ifndef DISABLE_PRDR
3877 if (!sx
->prdr_active
)
3880 /* Update the journal. For homonymic addresses, use the base address plus
3881 the transport name. See lots of comments in deliver.c about the reasons
3882 for the complications when homonyms are involved. Just carry on after
3883 write error, as it may prove possible to update the spool file later. */
3885 if (testflag(addr
, af_homonym
))
3886 sprintf(CS sx
->buffer
, "%.500s/%s\n", addr
->unique
+ 3, tblock
->name
);
3888 sprintf(CS sx
->buffer
, "%.500s\n", addr
->unique
);
3890 DEBUG(D_deliver
) debug_printf("S:journalling %s\n", sx
->buffer
);
3891 len
= Ustrlen(CS sx
->buffer
);
3892 if (write(journal_fd
, sx
->buffer
, len
) != len
)
3893 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to write journal for "
3894 "%s: %s", sx
->buffer
, strerror(errno
));
3898 #ifndef DISABLE_PRDR
3899 if (sx
->prdr_active
)
3901 const uschar
* overall_message
;
3903 /* PRDR - get the final, overall response. For any non-success
3904 upgrade all the address statuses. */
3906 sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2',
3910 if(errno
== 0 && sx
->buffer
[0] == '4')
3912 errno
= ERRNO_DATA4XX
;
3913 addrlist
->more_errno
|= ((sx
->buffer
[1] - '0')*10 + sx
->buffer
[2] - '0') << 8;
3915 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3916 if (sx
->buffer
[0] == '5' || addr
->transport_return
== OK
)
3917 addr
->transport_return
= PENDING_OK
; /* allow set_errno action */
3918 goto RESPONSE_FAILED
;
3921 /* Append the overall response to the individual PRDR response for logging
3922 and update the journal, or setup retry. */
3924 overall_message
= string_printing(sx
->buffer
);
3925 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3926 if (addr
->transport_return
== OK
)
3927 addr
->message
= string_sprintf("%s\\n%s", addr
->message
, overall_message
);
3929 for (address_item
* addr
= addrlist
; addr
!= sx
->first_addr
; addr
= addr
->next
)
3930 if (addr
->transport_return
== OK
)
3932 if (testflag(addr
, af_homonym
))
3933 sprintf(CS sx
->buffer
, "%.500s/%s\n", addr
->unique
+ 3, tblock
->name
);
3935 sprintf(CS sx
->buffer
, "%.500s\n", addr
->unique
);
3937 DEBUG(D_deliver
) debug_printf("journalling(PRDR) %s\n", sx
->buffer
);
3938 len
= Ustrlen(CS sx
->buffer
);
3939 if (write(journal_fd
, sx
->buffer
, len
) != len
)
3940 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to write journal for "
3941 "%s: %s", sx
->buffer
, strerror(errno
));
3943 else if (addr
->transport_return
== DEFER
)
3944 retry_add_item(addr
, addr
->address_retry_key
, -2);
3948 /* Ensure the journal file is pushed out to disk. */
3950 if (EXIMfsync(journal_fd
) < 0)
3951 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to fsync journal: %s",
3957 /* Handle general (not specific to one address) failures here. The value of ok
3958 is used to skip over this code on the falling through case. A timeout causes a
3959 deferral. Other errors may defer or fail according to the response code, and
3960 may set up a special errno value, e.g. after connection chopped, which is
3961 assumed if errno == 0 and there is no text in the buffer. If control reaches
3962 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3963 the problem is not related to this specific message. */
3968 uschar
* set_message
;
3974 sx
->send_quit
= check_response(host
, &save_errno
, addrlist
->more_errno
,
3975 sx
->buffer
, &code
, &message
, &pass_message
);
3983 message
= string_sprintf("send() to %s [%s] failed: %s",
3984 host
->name
, host
->address
, message
? message
: US
strerror(save_errno
));
3985 sx
->send_quit
= FALSE
;
3993 sx
->ok
= FALSE
; /* For when reached by GOTO */
3994 set_message
= message
;
3996 /* We want to handle timeouts after MAIL or "." and loss of connection after
3997 "." specially. They can indicate a problem with the sender address or with
3998 the contents of the message rather than a real error on the connection. These
3999 cases are treated in the same way as a 4xx response. This next bit of code
4000 does the classification. */
4007 message_error
= TRUE
;
4011 message_error
= Ustrncmp(smtp_command
,"MAIL",4) == 0 ||
4012 Ustrncmp(smtp_command
,"end ",4) == 0;
4015 case ERRNO_SMTPCLOSED
:
4016 message_error
= Ustrncmp(smtp_command
,"end ",4) == 0;
4020 message_error
= FALSE
;
4024 /* Handle the cases that are treated as message errors. These are:
4026 (a) negative response or timeout after MAIL
4027 (b) negative response after DATA
4028 (c) negative response or timeout or dropped connection after "."
4029 (d) utf8 support required and not offered
4031 It won't be a negative response or timeout after RCPT, as that is dealt
4032 with separately above. The action in all cases is to set an appropriate
4033 error code for all the addresses, but to leave yield set to OK because the
4034 host itself has not failed. Of course, it might in practice have failed
4035 when we've had a timeout, but if so, we'll discover that at the next
4036 delivery attempt. For a temporary error, set the message_defer flag, and
4037 write to the logs for information if this is not the last host. The error
4038 for the last host will be logged as part of the address's log line. */
4042 if (mua_wrapper
) code
= '5'; /* Force hard failure in wrapper mode */
4044 /* If there's an errno, the message contains just the identity of
4049 else /* Anything other than 5 is treated as temporary */
4053 message
= US
string_sprintf("%s: %s", message
, strerror(save_errno
));
4055 write_logs(host
, message
, sx
->first_addr
? sx
->first_addr
->basic_errno
: 0);
4057 *message_defer
= TRUE
;
4061 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4062 ".", or some other transportation error. We defer all addresses and yield
4063 DEFER, except for the case of failed add_headers expansion, or a transport
4064 filter failure, when the yield should be ERROR, to stop it trying other
4069 #ifdef SUPPORT_PIPE_CONNECT
4070 /* If we were early-pipelinng and the actual EHLO response did not match
4071 the cached value we assumed, we could have detected it and passed a
4072 custom errno through to here. It would be nice to RSET and retry right
4073 away, but to reliably do that we eould need an extra synch point before
4074 we committed to data and that would discard half the gained roundrips.
4075 Or we could summarily drop the TCP connection. but that is also ugly.
4076 Instead, we ignore the possibility (having freshened the cache) and rely
4077 on the server telling us with a nonmessage error if we have tried to
4078 do something it no longer supports. */
4081 yield
= (save_errno
== ERRNO_CHHEADER_FAIL
||
4082 save_errno
== ERRNO_FILTER_FAIL
) ? ERROR
: DEFER
;
4086 set_errno(addrlist
, save_errno
, set_message
, set_rc
, pass_message
, host
4087 #ifdef EXPERIMENTAL_DSN_INFO
4088 , sx
->smtp_greeting
, sx
->helo_response
4094 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4095 SMTP session tidily. However, if there were too many addresses to send in one
4096 message (indicated by first_addr being non-NULL) we want to carry on with the
4097 rest of them. Also, it is desirable to send more than one message down the SMTP
4098 connection if there are several waiting, provided we haven't already sent so
4099 many as to hit the configured limit. The function transport_check_waiting looks
4100 for a waiting message and returns its id. Then transport_pass_socket tries to
4101 set up a continued delivery by passing the socket on to another process. The
4102 variable send_rset is FALSE if a message has just been successfully transferred.
4104 If we are already sending down a continued channel, there may be further
4105 addresses not yet delivered that are aimed at the same host, but which have not
4106 been passed in this run of the transport. In this case, continue_more will be
4107 true, and all we should do is send RSET if necessary, and return, leaving the
4110 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4111 do not want to continue with other messages down the same channel, because that
4112 can lead to looping between two or more messages, all with the same,
4113 temporarily failing address(es). [The retry information isn't updated yet, so
4114 new processes keep on trying.] We probably also don't want to try more of this
4115 message's addresses either.
4117 If we have started a TLS session, we have to end it before passing the
4118 connection to a new process. However, not all servers can handle this (Exim
4119 can), so we do not pass such a connection on if the host matches
4120 hosts_nopass_tls. */
4123 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4124 "yield=%d first_address is %sNULL\n", sx
->ok
, sx
->send_quit
,
4125 sx
->send_rset
, f
.continue_more
, yield
, sx
->first_addr
? "not " : "");
4127 if (sx
->completed_addr
&& sx
->ok
&& sx
->send_quit
)
4130 smtp_compare_t t_compare
;
4132 t_compare
.tblock
= tblock
;
4133 t_compare
.current_sender_address
= sender_address
;
4135 if ( sx
->first_addr
!= NULL
4139 ( tls_out
.active
.sock
< 0 && !continue_proxy_cipher
4140 || verify_check_given_host(CUSS
&ob
->hosts_nopass_tls
, host
) != OK
4144 transport_check_waiting(tblock
->name
, host
->name
,
4145 tblock
->connection_max_messages
, new_message_id
, &more
,
4146 (oicf
)smtp_are_same_identities
, (void*)&t_compare
)
4153 if (! (sx
->ok
= smtp_write_command(sx
, SCMD_FLUSH
, "RSET\r\n") >= 0))
4155 msg
= US
string_sprintf("send() to %s [%s] failed: %s", host
->name
,
4156 host
->address
, strerror(errno
));
4157 sx
->send_quit
= FALSE
;
4159 else if (! (sx
->ok
= smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
4160 '2', ob
->command_timeout
)))
4163 sx
->send_quit
= check_response(host
, &errno
, 0, sx
->buffer
, &code
, &msg
,
4167 DEBUG(D_transport
) debug_printf("H=%s [%s] %s\n",
4168 host
->name
, host
->address
, msg
);
4172 /* Either RSET was not needed, or it succeeded */
4179 int socket_fd
= sx
->cctx
.sock
;
4182 if (sx
->first_addr
!= NULL
) /* More addresses still to be sent */
4183 { /* in this run of the transport */
4184 continue_sequence
++; /* Causes * in logging */
4188 /* Unless caller said it already has more messages listed for this host,
4189 pass the connection on to a new Exim process (below, the call to
4190 transport_pass_socket). If the caller has more ready, just return with
4191 the connection still open. */
4194 if (tls_out
.active
.sock
>= 0)
4195 if ( f
.continue_more
4196 || verify_check_given_host(CUSS
&ob
->hosts_noproxy_tls
, host
) == OK
)
4198 /* Before passing the socket on, or returning to caller with it still
4199 open, we must shut down TLS. Not all MTAs allow for the continuation
4200 of the SMTP session when TLS is shut down. We test for this by sending
4201 a new EHLO. If we don't get a good response, we don't attempt to pass
4204 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_WAIT
);
4205 sx
->cctx
.tls_ctx
= NULL
;
4206 smtp_peer_options
= smtp_peer_options_wrap
;
4208 && smtp_write_command(sx
, SCMD_FLUSH
, "EHLO %s\r\n", sx
->helo_data
)
4210 && smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
),
4211 '2', ob
->command_timeout
);
4213 if (sx
->ok
&& f
.continue_more
)
4214 return yield
; /* More addresses for another run */
4218 /* Set up a pipe for proxying TLS for the new transport process */
4220 smtp_peer_options
|= OPTION_TLS
;
4221 if ((sx
->ok
= socketpair(AF_UNIX
, SOCK_STREAM
, 0, pfd
) == 0))
4224 set_errno(sx
->first_addr
, errno
, US
"internal allocation problem",
4226 # ifdef EXPERIMENTAL_DSN_INFO
4227 , sx
->smtp_greeting
, sx
->helo_response
4233 if (f
.continue_more
)
4234 return yield
; /* More addresses for another run */
4236 /* If the socket is successfully passed, we mustn't send QUIT (or
4237 indeed anything!) from here. */
4239 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4240 propagate it from the initial
4242 if (sx
->ok
&& transport_pass_socket(tblock
->name
, host
->name
,
4243 host
->address
, new_message_id
, socket_fd
))
4245 sx
->send_quit
= FALSE
;
4247 /* We have passed the client socket to a fresh transport process.
4248 If TLS is still active, we need to proxy it for the transport we
4249 just passed the baton to. Fork a child to to do it, and return to
4250 get logging done asap. Which way to place the work makes assumptions
4251 about post-fork prioritisation which may not hold on all platforms. */
4253 if (tls_out
.active
.sock
>= 0)
4256 if (pid
== 0) /* child; fork again to disconnect totally */
4258 testharness_pause_ms(100); /* let parent debug out */
4259 /* does not return */
4260 smtp_proxy_tls(sx
->cctx
.tls_ctx
, sx
->buffer
, sizeof(sx
->buffer
), pfd
,
4261 ob
->command_timeout
);
4264 if (pid
> 0) /* parent */
4266 DEBUG(D_transport
) debug_printf("proxy-proc inter-pid %d\n", pid
);
4268 /* tidy the inter-proc to disconn the proxy proc */
4269 waitpid(pid
, NULL
, 0);
4270 tls_close(sx
->cctx
.tls_ctx
, TLS_NO_SHUTDOWN
);
4271 sx
->cctx
.tls_ctx
= NULL
;
4272 (void)close(sx
->cctx
.sock
);
4274 continue_transport
= NULL
;
4275 continue_hostname
= NULL
;
4278 log_write(0, LOG_PANIC_DIE
, "fork failed");
4284 /* If RSET failed and there are addresses left, they get deferred. */
4286 set_errno(sx
->first_addr
, errno
, msg
, DEFER
, FALSE
, host
4287 #ifdef EXPERIMENTAL_DSN_INFO
4288 , sx
->smtp_greeting
, sx
->helo_response
4294 /* End off tidily with QUIT unless the connection has died or the socket has
4295 been passed to another process. There has been discussion on the net about what
4296 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4297 to wait for a response, but on the other hand, there isn't anything one can do
4298 with an error response, other than log it. Exim used to do that. However,
4299 further discussion suggested that it is positively advantageous not to wait for
4300 the response, but to close the session immediately. This is supposed to move
4301 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4302 load from the server. (Hosts that are both servers and clients may not see much
4303 difference, of course.) Further discussion indicated that this was safe to do
4304 on Unix systems which have decent implementations of TCP/IP that leave the
4305 connection around for a while (TIME_WAIT) after the application has gone away.
4306 This enables the response sent by the server to be properly ACKed rather than
4307 timed out, as can happen on broken TCP/IP implementations on other OS.
4309 This change is being made on 31-Jul-98. After over a year of trouble-free
4310 operation, the old commented-out code was removed on 17-Sep-99. */
4314 (void) setsockopt(sx
->cctx
.sock
, IPPROTO_TCP
, TCP_CORK
, US
&on
, sizeof(on
));
4316 if (sx
->send_quit
) (void)smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n");
4321 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
4322 sx
->cctx
.tls_ctx
= NULL
;
4325 /* Close the socket, and return the appropriate value, first setting
4326 works because the NULL setting is passed back to the calling process, and
4327 remote_max_parallel is forced to 1 when delivering over an existing connection,
4329 If all went well and continue_more is set, we shouldn't actually get here if
4330 there are further addresses, as the return above will be taken. However,
4331 writing RSET might have failed, or there may be other addresses whose hosts are
4332 specified in the transports, and therefore not visible at top level, in which
4333 case continue_more won't get set. */
4335 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
4338 shutdown(sx
->cctx
.sock
, SHUT_WR
);
4340 testharness_pause_ms(200);
4341 if (fcntl(sx
->cctx
.sock
, F_SETFL
, O_NONBLOCK
) == 0)
4342 for (int i
= 16; read(sx
->cctx
.sock
, sx
->inbuffer
, sizeof(sx
->inbuffer
)) > 0 && i
> 0;)
4343 i
--; /* drain socket */
4345 (void)close(sx
->cctx
.sock
);
4347 #ifndef DISABLE_EVENT
4348 (void) event_raise(tblock
->event_action
, US
"tcp:close", NULL
);
4351 continue_transport
= NULL
;
4352 continue_hostname
= NULL
;
4359 /*************************************************
4360 * Closedown entry point *
4361 *************************************************/
4363 /* This function is called when exim is passed an open smtp channel
4364 from another incarnation, but the message which it has been asked
4365 to deliver no longer exists. The channel is on stdin.
4367 We might do fancy things like looking for another message to send down
4368 the channel, but if the one we sought has gone, it has probably been
4369 delivered by some other process that itself will seek further messages,
4370 so just close down our connection.
4372 Argument: pointer to the transport instance block
4377 smtp_transport_closedown(transport_instance
*tblock
)
4379 smtp_transport_options_block
* ob
= SOB tblock
->options_block
;
4380 client_conn_ctx cctx
;
4383 uschar inbuffer
[4096];
4384 uschar outbuffer
[16];
4386 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4387 cctx
.sock
= fileno(stdin
);
4388 cctx
.tls_ctx
= cctx
.sock
== tls_out
.active
.sock
? tls_out
.active
.tls_ctx
: NULL
;
4390 sx
.inblock
.cctx
= &cctx
;
4391 sx
.inblock
.buffer
= inbuffer
;
4392 sx
.inblock
.buffersize
= sizeof(inbuffer
);
4393 sx
.inblock
.ptr
= inbuffer
;
4394 sx
.inblock
.ptrend
= inbuffer
;
4396 sx
.outblock
.cctx
= &cctx
;
4397 sx
.outblock
.buffersize
= sizeof(outbuffer
);
4398 sx
.outblock
.buffer
= outbuffer
;
4399 sx
.outblock
.ptr
= outbuffer
;
4400 sx
.outblock
.cmd_count
= 0;
4401 sx
.outblock
.authenticating
= FALSE
;
4403 (void)smtp_write_command(&sx
, SCMD_FLUSH
, "QUIT\r\n");
4404 (void)smtp_read_response(&sx
, buffer
, sizeof(buffer
), '2', ob
->command_timeout
);
4405 (void)close(cctx
.sock
);
4410 /*************************************************
4411 * Prepare addresses for delivery *
4412 *************************************************/
4414 /* This function is called to flush out error settings from previous delivery
4415 attempts to other hosts. It also records whether we got here via an MX record
4416 or not in the more_errno field of the address. We are interested only in
4417 addresses that are still marked DEFER - others may have got delivered to a
4418 previously considered IP address. Set their status to PENDING_DEFER to indicate
4419 which ones are relevant this time.
4422 addrlist the list of addresses
4423 host the host we are delivering to
4425 Returns: the first address for this delivery
4428 static address_item
*
4429 prepare_addresses(address_item
*addrlist
, host_item
*host
)
4431 address_item
*first_addr
= NULL
;
4432 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4433 if (addr
->transport_return
== DEFER
)
4435 if (!first_addr
) first_addr
= addr
;
4436 addr
->transport_return
= PENDING_DEFER
;
4437 addr
->basic_errno
= 0;
4438 addr
->more_errno
= (host
->mx
>= 0)? 'M' : 'A';
4439 addr
->message
= NULL
;
4441 addr
->cipher
= NULL
;
4442 addr
->ourcert
= NULL
;
4443 addr
->peercert
= NULL
;
4444 addr
->peerdn
= NULL
;
4445 addr
->ocsp
= OCSP_NOT_REQ
;
4446 addr
->tlsver
= NULL
;
4448 #ifdef EXPERIMENTAL_DSN_INFO
4449 addr
->smtp_greeting
= NULL
;
4450 addr
->helo_response
= NULL
;
4458 /*************************************************
4459 * Main entry point *
4460 *************************************************/
4462 /* See local README for interface details. As this is a remote transport, it is
4463 given a chain of addresses to be delivered in one connection, if possible. It
4464 always returns TRUE, indicating that each address has its own independent
4465 status set, except if there is a setting up problem, in which case it returns
4469 smtp_transport_entry(
4470 transport_instance
*tblock
, /* data for this instantiation */
4471 address_item
*addrlist
) /* addresses we are working on */
4474 int hosts_defer
= 0;
4476 int hosts_looked_up
= 0;
4477 int hosts_retry
= 0;
4478 int hosts_serial
= 0;
4479 int hosts_total
= 0;
4480 int total_hosts_tried
= 0;
4481 BOOL expired
= TRUE
;
4482 uschar
*expanded_hosts
= NULL
;
4484 uschar
*tid
= string_sprintf("%s transport", tblock
->name
);
4485 smtp_transport_options_block
*ob
= SOB tblock
->options_block
;
4486 host_item
*hostlist
= addrlist
->host_list
;
4487 host_item
*host
= NULL
;
4491 debug_printf("%s transport entered\n", tblock
->name
);
4492 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4493 debug_printf(" %s\n", addr
->address
);
4496 debug_printf("hostlist:\n");
4497 for (host_item
* host
= hostlist
; host
; host
= host
->next
)
4498 debug_printf(" '%s' IP %s port %d\n", host
->name
, host
->address
, host
->port
);
4500 if (continue_hostname
)
4501 debug_printf("already connected to %s [%s] (on fd %d)\n",
4502 continue_hostname
, continue_host_address
,
4503 cutthrough
.cctx
.sock
>= 0 ? cutthrough
.cctx
.sock
: 0);
4506 /* Set the flag requesting that these hosts be added to the waiting
4507 database if the delivery fails temporarily or if we are running with
4508 queue_smtp or a 2-stage queue run. This gets unset for certain
4509 kinds of error, typically those that are specific to the message. */
4511 update_waiting
= TRUE
;
4513 /* If a host list is not defined for the addresses - they must all have the
4514 same one in order to be passed to a single transport - or if the transport has
4515 a host list with hosts_override set, use the host list supplied with the
4516 transport. It is an error for this not to exist. */
4518 if (!hostlist
|| (ob
->hosts_override
&& ob
->hosts
))
4522 addrlist
->message
= string_sprintf("%s transport called with no hosts set",
4524 addrlist
->transport_return
= PANIC
;
4525 return FALSE
; /* Only top address has status */
4528 DEBUG(D_transport
) debug_printf("using the transport's hosts: %s\n",
4531 /* If the transport's host list contains no '$' characters, and we are not
4532 randomizing, it is fixed and therefore a chain of hosts can be built once
4533 and for all, and remembered for subsequent use by other calls to this
4534 transport. If, on the other hand, the host list does contain '$', or we are
4535 randomizing its order, we have to rebuild it each time. In the fixed case,
4536 as the hosts string will never be used again, it doesn't matter that we
4537 replace all the : characters with zeros. */
4541 uschar
*s
= ob
->hosts
;
4543 if (Ustrchr(s
, '$') != NULL
)
4545 if (!(expanded_hosts
= expand_string(s
)))
4547 addrlist
->message
= string_sprintf("failed to expand list of hosts "
4548 "\"%s\" in %s transport: %s", s
, tblock
->name
, expand_string_message
);
4549 addrlist
->transport_return
= f
.search_find_defer
? DEFER
: PANIC
;
4550 return FALSE
; /* Only top address has status */
4552 DEBUG(D_transport
) debug_printf("expanded list of hosts \"%s\" to "
4553 "\"%s\"\n", s
, expanded_hosts
);
4557 if (ob
->hosts_randomize
) s
= expanded_hosts
= string_copy(s
);
4561 log_write(0, LOG_MAIN
|LOG_PANIC
,
4562 "attempt to use tainted host list '%s' from '%s' in transport %s",
4563 s
, ob
->hosts
, tblock
->name
);
4564 /* Avoid leaking info to an attacker */
4565 addrlist
->message
= US
"internal configuration error";
4566 addrlist
->transport_return
= PANIC
;
4570 host_build_hostlist(&hostlist
, s
, ob
->hosts_randomize
);
4572 /* Check that the expansion yielded something useful. */
4576 string_sprintf("%s transport has empty hosts setting", tblock
->name
);
4577 addrlist
->transport_return
= PANIC
;
4578 return FALSE
; /* Only top address has status */
4581 /* If there was no expansion of hosts, save the host list for
4584 if (!expanded_hosts
) ob
->hostlist
= hostlist
;
4587 /* This is not the first time this transport has been run in this delivery;
4588 the host list was built previously. */
4591 hostlist
= ob
->hostlist
;
4594 /* The host list was supplied with the address. If hosts_randomize is set, we
4595 must sort it into a random order if it did not come from MX records and has not
4596 already been randomized (but don't bother if continuing down an existing
4599 else if (ob
->hosts_randomize
&& hostlist
->mx
== MX_NONE
&& !continue_hostname
)
4601 host_item
*newlist
= NULL
;
4604 host_item
*h
= hostlist
;
4605 hostlist
= hostlist
->next
;
4607 h
->sort_key
= random_number(100);
4614 else if (h
->sort_key
< newlist
->sort_key
)
4621 host_item
*hh
= newlist
;
4624 if (h
->sort_key
< hh
->next
->sort_key
) break;
4632 hostlist
= addrlist
->host_list
= newlist
;
4635 /* Sort out the default port. */
4637 if (!smtp_get_port(ob
->port
, addrlist
, &defport
, tid
)) return FALSE
;
4639 /* For each host-plus-IP-address on the list:
4641 . If this is a continued delivery and the host isn't the one with the
4642 current connection, skip.
4644 . If the status is unusable (i.e. previously failed or retry checked), skip.
4646 . If no IP address set, get the address, either by turning the name into
4647 an address, calling gethostbyname if gethostbyname is on, or by calling
4648 the DNS. The DNS may yield multiple addresses, in which case insert the
4649 extra ones into the list.
4651 . Get the retry data if not previously obtained for this address and set the
4652 field which remembers the state of this address. Skip if the retry time is
4653 not reached. If not, remember whether retry data was found. The retry string
4654 contains both the name and the IP address.
4656 . Scan the list of addresses and mark those whose status is DEFER as
4657 PENDING_DEFER. These are the only ones that will be processed in this cycle
4660 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4661 Some addresses may be successfully delivered, others may fail, and yet
4662 others may get temporary errors and so get marked DEFER.
4664 . The return from the delivery attempt is OK if a connection was made and a
4665 valid SMTP dialogue was completed. Otherwise it is DEFER.
4667 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4669 . If fail to connect, or other defer state, add a retry item.
4671 . If there are any addresses whose status is still DEFER, carry on to the
4672 next host/IPaddress, unless we have tried the number of hosts given
4673 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4674 there is some fancy logic for hosts_max_try that means its limit can be
4675 overstepped in some circumstances.
4677 If we get to the end of the list, all hosts have deferred at least one address,
4678 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4679 delivery attempt to those hosts whose last try was before the arrival time of
4680 the current message. To cope with this, we have to go round the loop a second
4681 time. After that, set the status and error data for any addresses that haven't
4682 had it set already. */
4684 for (int cutoff_retry
= 0;
4685 expired
&& cutoff_retry
< (ob
->delay_after_cutoff
? 1 : 2);
4688 host_item
*nexthost
= NULL
;
4689 int unexpired_hosts_tried
= 0;
4690 BOOL continue_host_tried
= FALSE
;
4692 retry_non_continued
:
4693 for (host
= hostlist
;
4695 && unexpired_hosts_tried
< ob
->hosts_max_try
4696 && total_hosts_tried
< ob
->hosts_max_try_hardlimit
;
4701 BOOL host_is_expired
= FALSE
;
4702 BOOL message_defer
= FALSE
;
4703 BOOL some_deferred
= FALSE
;
4704 address_item
*first_addr
= NULL
;
4705 uschar
*interface
= NULL
;
4706 uschar
*retry_host_key
= NULL
;
4707 uschar
*retry_message_key
= NULL
;
4708 uschar
*serialize_key
= NULL
;
4710 /* Default next host is next host. :-) But this can vary if the
4711 hosts_max_try limit is hit (see below). It may also be reset if a host
4712 address is looked up here (in case the host was multihomed). */
4714 nexthost
= host
->next
;
4716 /* If the address hasn't yet been obtained from the host name, look it up
4717 now, unless the host is already marked as unusable. If it is marked as
4718 unusable, it means that the router was unable to find its IP address (in
4719 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4720 the lookup failed last time. We don't get this far if *all* MX records
4721 point to non-existent hosts; that is treated as a hard error.
4723 We can just skip this host entirely. When the hosts came from the router,
4724 the address will timeout based on the other host(s); when the address is
4725 looked up below, there is an explicit retry record added.
4727 Note that we mustn't skip unusable hosts if the address is not unset; they
4728 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4732 int new_port
, flags
;
4734 if (host
->status
>= hstatus_unusable
)
4736 DEBUG(D_transport
) debug_printf("%s has no address and is unusable - skipping\n",
4741 DEBUG(D_transport
) debug_printf("getting address for %s\n", host
->name
);
4743 /* The host name is permitted to have an attached port. Find it, and
4744 strip it from the name. Just remember it for now. */
4746 new_port
= host_item_get_port(host
);
4748 /* Count hosts looked up */
4752 /* Find by name if so configured, or if it's an IP address. We don't
4753 just copy the IP address, because we need the test-for-local to happen. */
4755 flags
= HOST_FIND_BY_A
| HOST_FIND_BY_AAAA
;
4756 if (ob
->dns_qualify_single
) flags
|= HOST_FIND_QUALIFY_SINGLE
;
4757 if (ob
->dns_search_parents
) flags
|= HOST_FIND_SEARCH_PARENTS
;
4759 if (ob
->gethostbyname
|| string_is_ip_address(host
->name
, NULL
) != 0)
4760 rc
= host_find_byname(host
, NULL
, flags
, NULL
, TRUE
);
4762 rc
= host_find_bydns(host
, NULL
, flags
, NULL
, NULL
, NULL
,
4763 &ob
->dnssec
, /* domains for request/require */
4766 /* Update the host (and any additional blocks, resulting from
4767 multihoming) with a host-specific port, if any. */
4769 for (host_item
* hh
= host
; hh
!= nexthost
; hh
= hh
->next
) hh
->port
= new_port
;
4771 /* Failure to find the host at this time (usually DNS temporary failure)
4772 is really a kind of routing failure rather than a transport failure.
4773 Therefore we add a retry item of the routing kind, not to stop us trying
4774 to look this name up here again, but to ensure the address gets timed
4775 out if the failures go on long enough. A complete failure at this point
4776 commonly points to a configuration error, but the best action is still
4777 to carry on for the next host. */
4779 if (rc
== HOST_FIND_AGAIN
|| rc
== HOST_FIND_SECURITY
|| rc
== HOST_FIND_FAILED
)
4781 retry_add_item(addrlist
, string_sprintf("R:%s", host
->name
), 0);
4783 if (rc
== HOST_FIND_AGAIN
) hosts_defer
++; else hosts_fail
++;
4784 DEBUG(D_transport
) debug_printf("rc = %s for %s\n", (rc
== HOST_FIND_AGAIN
)?
4785 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host
->name
);
4786 host
->status
= hstatus_unusable
;
4788 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4790 if (addr
->transport_return
!= DEFER
) continue;
4791 addr
->basic_errno
= ERRNO_UNKNOWNHOST
;
4792 addr
->message
= string_sprintf(
4793 rc
== HOST_FIND_SECURITY
4794 ? "lookup of IP address for %s was insecure"
4795 : "failed to lookup IP address for %s",
4801 /* If the host is actually the local host, we may have a problem, or
4802 there may be some cunning configuration going on. In the problem case,
4803 log things and give up. The default transport status is already DEFER. */
4805 if (rc
== HOST_FOUND_LOCAL
&& !ob
->allow_localhost
)
4807 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4809 addr
->basic_errno
= 0;
4810 addr
->message
= string_sprintf("%s transport found host %s to be "
4811 "local", tblock
->name
, host
->name
);
4815 } /* End of block for IP address lookup */
4817 /* If this is a continued delivery, we are interested only in the host
4818 which matches the name of the existing open channel. The check is put
4819 here after the local host lookup, in case the name gets expanded as a
4820 result of the lookup. Set expired FALSE, to save the outer loop executing
4823 if (continue_hostname
)
4824 if ( Ustrcmp(continue_hostname
, host
->name
) != 0
4825 || Ustrcmp(continue_host_address
, host
->address
) != 0
4829 continue; /* With next host */
4832 continue_host_tried
= TRUE
;
4834 /* Reset the default next host in case a multihomed host whose addresses
4835 are not looked up till just above added to the host list. */
4837 nexthost
= host
->next
;
4839 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4840 domain is in queue_smtp_domains, we don't actually want to attempt any
4841 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4842 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4843 were not in it. We don't want to hold up all SMTP deliveries! Except when
4844 doing a two-stage queue run, don't do this if forcing. */
4846 if ((!f
.deliver_force
|| f
.queue_2stage
) && (f
.queue_smtp
||
4847 match_isinlist(addrlist
->domain
,
4848 (const uschar
**)&queue_smtp_domains
, 0,
4849 &domainlist_anchor
, NULL
, MCL_DOMAIN
, TRUE
, NULL
) == OK
))
4852 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
4853 if (addr
->transport_return
== DEFER
)
4854 addr
->message
= US
"domain matches queue_smtp_domains, or -odqs set";
4855 continue; /* With next host */
4858 /* Count hosts being considered - purely for an intelligent comment
4859 if none are usable. */
4863 /* Set $host and $host address now in case they are needed for the
4864 interface expansion or the serialize_hosts check; they remain set if an
4865 actual delivery happens. */
4867 deliver_host
= host
->name
;
4868 deliver_host_address
= host
->address
;
4869 lookup_dnssec_authenticated
= host
->dnssec
== DS_YES
? US
"yes"
4870 : host
->dnssec
== DS_NO
? US
"no"
4873 /* Set up a string for adding to the retry key if the port number is not
4874 the standard SMTP port. A host may have its own port setting that overrides
4877 pistring
= string_sprintf(":%d", host
->port
== PORT_NONE
4878 ? defport
: host
->port
);
4879 if (Ustrcmp(pistring
, ":25") == 0) pistring
= US
"";
4881 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4882 string is set, even if constant (as different transports can have different
4883 constant settings), we must add it to the key that is used for retries,
4884 because connections to the same host from a different interface should be
4885 treated separately. */
4887 host_af
= Ustrchr(host
->address
, ':') == NULL
? AF_INET
: AF_INET6
;
4889 uschar
* s
= ob
->interface
;
4892 if (!smtp_get_interface(s
, host_af
, addrlist
, &interface
, tid
))
4894 pistring
= string_sprintf("%s/%s", pistring
, interface
);
4898 /* The first time round the outer loop, check the status of the host by
4899 inspecting the retry data. The second time round, we are interested only
4900 in expired hosts that haven't been tried since this message arrived. */
4902 if (cutoff_retry
== 0)
4905 /* Ensure the status of the address is set by checking retry data if
4906 necessary. There may be host-specific retry data (applicable to all
4907 messages) and also data for retries of a specific message at this host.
4908 If either of these retry records are actually read, the keys used are
4909 returned to save recomputing them later. */
4911 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
4912 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
4913 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
4914 continue; /* with next host */
4916 host_is_expired
= retry_check_address(addrlist
->domain
, host
, pistring
,
4917 incl_ip
, &retry_host_key
, &retry_message_key
);
4919 DEBUG(D_transport
) debug_printf("%s [%s]%s retry-status = %s\n", host
->name
,
4920 host
->address
? host
->address
: US
"", pistring
,
4921 host
->status
== hstatus_usable
? "usable"
4922 : host
->status
== hstatus_unusable
? "unusable"
4923 : host
->status
== hstatus_unusable_expired
? "unusable (expired)" : "?");
4925 /* Skip this address if not usable at this time, noting if it wasn't
4926 actually expired, both locally and in the address. */
4928 switch (host
->status
)
4930 case hstatus_unusable
:
4932 setflag(addrlist
, af_retry_skipped
);
4935 case hstatus_unusable_expired
:
4938 case hwhy_retry
: hosts_retry
++; break;
4939 case hwhy_failed
: hosts_fail
++; break;
4941 case hwhy_deferred
: hosts_defer
++; break;
4944 /* If there was a retry message key, implying that previously there
4945 was a message-specific defer, we don't want to update the list of
4946 messages waiting for these hosts. */
4948 if (retry_message_key
) update_waiting
= FALSE
;
4949 continue; /* With the next host or IP address */
4953 /* Second time round the loop: if the address is set but expired, and
4954 the message is newer than the last try, let it through. */
4959 || host
->status
!= hstatus_unusable_expired
4960 || host
->last_try
> received_time
.tv_sec
)
4962 DEBUG(D_transport
) debug_printf("trying expired host %s [%s]%s\n",
4963 host
->name
, host
->address
, pistring
);
4964 host_is_expired
= TRUE
;
4967 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4968 it remains TRUE only if all hosts are expired and none are actually tried.
4973 /* If this host is listed as one to which access must be serialized,
4974 see if another Exim process has a connection to it, and if so, skip
4975 this host. If not, update the database to record our connection to it
4976 and remember this for later deletion. Do not do any of this if we are
4977 sending the message down a pre-existing connection. */
4979 if ( !continue_hostname
4980 && verify_check_given_host(CUSS
&ob
->serialize_hosts
, host
) == OK
)
4982 serialize_key
= string_sprintf("host-serialize-%s", host
->name
);
4983 if (!enq_start(serialize_key
, 1))
4986 debug_printf("skipping host %s because another Exim process "
4987 "is connected to it\n", host
->name
);
4993 /* OK, we have an IP address that is not waiting for its retry time to
4994 arrive (it might be expired) OR (second time round the loop) we have an
4995 expired host that hasn't been tried since the message arrived. Have a go
4996 at delivering the message to it. First prepare the addresses by flushing
4997 out the result of previous attempts, and finding the first address that
4998 is still to be delivered. */
5000 first_addr
= prepare_addresses(addrlist
, host
);
5002 DEBUG(D_transport
) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5003 message_id
, host
->name
, host
->address
, addrlist
->address
,
5004 addrlist
->next
? ", ..." : "");
5006 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5007 message_id
, host
->name
, host
->address
, pistring
, addrlist
->address
,
5008 addrlist
->next
? ", ..." : "");
5010 /* This is not for real; don't do the delivery. If there are
5011 any remaining hosts, list them. */
5015 set_errno_nohost(addrlist
, 0, NULL
, OK
, FALSE
);
5016 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5018 addr
->host_used
= host
;
5019 addr
->special_action
= '*';
5020 addr
->message
= US
"delivery bypassed by -N option";
5024 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5025 "*** host and remaining hosts:\n", tblock
->name
);
5026 for (host_item
* host2
= host
; host2
; host2
= host2
->next
)
5027 debug_printf(" %s [%s]\n", host2
->name
,
5028 host2
->address
? host2
->address
: US
"unset");
5033 /* This is for real. If the host is expired, we don't count it for
5034 hosts_max_retry. This ensures that all hosts must expire before an address
5035 is timed out, unless hosts_max_try_hardlimit (which protects against
5036 lunatic DNS configurations) is reached.
5038 If the host is not expired and we are about to hit the hosts_max_retry
5039 limit, check to see if there is a subsequent hosts with a different MX
5040 value. If so, make that the next host, and don't count this one. This is a
5041 heuristic to make sure that different MXs do get tried. With a normal kind
5042 of retry rule, they would get tried anyway when the earlier hosts were
5043 delayed, but if the domain has a "retry every time" type of rule - as is
5044 often used for the the very large ISPs, that won't happen. */
5049 /* Make a copy of the host if it is local to this invocation
5050 of the transport. */
5054 thost
= store_get(sizeof(host_item
), FALSE
);
5056 thost
->name
= string_copy(host
->name
);
5057 thost
->address
= string_copy(host
->address
);
5062 if (!host_is_expired
&& ++unexpired_hosts_tried
>= ob
->hosts_max_try
)
5065 debug_printf("hosts_max_try limit reached with this host\n");
5066 for (host_item
* h
= host
; h
; h
= h
->next
) if (h
->mx
!= host
->mx
)
5069 unexpired_hosts_tried
--;
5070 DEBUG(D_transport
) debug_printf("however, a higher MX host exists "
5071 "and will be tried\n");
5076 /* Attempt the delivery. */
5078 total_hosts_tried
++;
5079 rc
= smtp_deliver(addrlist
, thost
, host_af
, defport
, interface
, tblock
,
5080 &message_defer
, FALSE
);
5083 OK => connection made, each address contains its result;
5084 message_defer is set for message-specific defers (when all
5085 recipients are marked defer)
5086 DEFER => there was a non-message-specific delivery problem;
5087 ERROR => there was a problem setting up the arguments for a filter,
5088 or there was a problem with expanding added headers
5091 /* If the result is not OK, there was a non-message-specific problem.
5092 If the result is DEFER, we need to write to the logs saying what happened
5093 for this particular host, except in the case of authentication and TLS
5094 failures, where the log has already been written. If all hosts defer a
5095 general message is written at the end. */
5097 if (rc
== DEFER
&& first_addr
->basic_errno
!= ERRNO_AUTHFAIL
5098 && first_addr
->basic_errno
!= ERRNO_TLSFAILURE
)
5099 write_logs(host
, first_addr
->message
, first_addr
->basic_errno
);
5101 #ifndef DISABLE_EVENT
5103 deferred_event_raise(first_addr
, host
);
5106 /* If STARTTLS was accepted, but there was a failure in setting up the
5107 TLS session (usually a certificate screwup), and the host is not in
5108 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5109 TLS forcibly turned off. We have to start from scratch with a new SMTP
5110 connection. That's why the retry is done from here, not from within
5111 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5112 session, so the in-clear transmission after those errors, if permitted,
5113 happens inside smtp_deliver().] */
5117 && first_addr
->basic_errno
== ERRNO_TLSFAILURE
5118 && ob
->tls_tempfail_tryclear
5119 && verify_check_given_host(CUSS
&ob
->hosts_require_tls
, host
) != OK
5122 log_write(0, LOG_MAIN
,
5123 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5124 first_addr
->message
, host
->name
, host
->address
);
5125 first_addr
= prepare_addresses(addrlist
, host
);
5126 rc
= smtp_deliver(addrlist
, thost
, host_af
, defport
, interface
, tblock
,
5127 &message_defer
, TRUE
);
5128 if (rc
== DEFER
&& first_addr
->basic_errno
!= ERRNO_AUTHFAIL
)
5129 write_logs(host
, first_addr
->message
, first_addr
->basic_errno
);
5130 # ifndef DISABLE_EVENT
5132 deferred_event_raise(first_addr
, host
);
5135 #endif /*DISABLE_TLS*/
5138 /* Delivery attempt finished */
5140 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5141 message_id
, host
->name
, host
->address
, pistring
, addrlist
->address
,
5142 addrlist
->next
? " (& others)" : "", rc_to_string(rc
));
5144 /* Release serialization if set up */
5146 if (serialize_key
) enq_end(serialize_key
);
5148 /* If the result is DEFER, or if a host retry record is known to exist, we
5149 need to add an item to the retry chain for updating the retry database
5150 at the end of delivery. We only need to add the item to the top address,
5151 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5152 for any other delivery attempts using the same address. (It is copied into
5153 the unusable tree at the outer level, so even if different address blocks
5154 contain the same address, it still won't get tried again.) */
5156 if (rc
== DEFER
|| retry_host_key
)
5158 int delete_flag
= rc
!= DEFER
? rf_delete
: 0;
5159 if (!retry_host_key
)
5162 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
5163 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
5164 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
5165 incl_ip
= TRUE
; /* error; use most-specific retry record */
5167 retry_host_key
= incl_ip
5168 ? string_sprintf("T:%S:%s%s", host
->name
, host
->address
, pistring
)
5169 : string_sprintf("T:%S%s", host
->name
, pistring
);
5172 /* If a delivery of another message over an existing SMTP connection
5173 yields DEFER, we do NOT set up retry data for the host. This covers the
5174 case when there are delays in routing the addresses in the second message
5175 that are so long that the server times out. This is alleviated by not
5176 routing addresses that previously had routing defers when handling an
5177 existing connection, but even so, this case may occur (e.g. if a
5178 previously happily routed address starts giving routing defers). If the
5179 host is genuinely down, another non-continued message delivery will
5180 notice it soon enough. */
5182 if (delete_flag
!= 0 || !continue_hostname
)
5183 retry_add_item(first_addr
, retry_host_key
, rf_host
| delete_flag
);
5185 /* We may have tried an expired host, if its retry time has come; ensure
5186 the status reflects the expiry for the benefit of any other addresses. */
5190 host
->status
= host_is_expired
5191 ? hstatus_unusable_expired
: hstatus_unusable
;
5192 host
->why
= hwhy_deferred
;
5196 /* If message_defer is set (host was OK, but every recipient got deferred
5197 because of some message-specific problem), or if that had happened
5198 previously so that a message retry key exists, add an appropriate item
5199 to the retry chain. Note that if there was a message defer but now there is
5200 a host defer, the message defer record gets deleted. That seems perfectly
5201 reasonable. Also, stop the message from being remembered as waiting
5202 for specific hosts. */
5204 if (message_defer
|| retry_message_key
)
5206 int delete_flag
= message_defer
? 0 : rf_delete
;
5207 if (!retry_message_key
)
5210 if (exp_bool(addrlist
, US
"transport", tblock
->name
, D_transport
,
5211 US
"retry_include_ip_address", ob
->retry_include_ip_address
,
5212 ob
->expand_retry_include_ip_address
, &incl_ip
) != OK
)
5213 incl_ip
= TRUE
; /* error; use most-specific retry record */
5215 retry_message_key
= incl_ip
5216 ? string_sprintf("T:%S:%s%s:%s", host
->name
, host
->address
, pistring
,
5218 : string_sprintf("T:%S%s:%s", host
->name
, pistring
, message_id
);
5220 retry_add_item(addrlist
, retry_message_key
,
5221 rf_message
| rf_host
| delete_flag
);
5222 update_waiting
= FALSE
;
5225 /* Any return other than DEFER (that is, OK or ERROR) means that the
5226 addresses have got their final statuses filled in for this host. In the OK
5227 case, see if any of them are deferred. */
5230 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5231 if (addr
->transport_return
== DEFER
)
5233 some_deferred
= TRUE
;
5237 /* If no addresses deferred or the result was ERROR, return. We do this for
5238 ERROR because a failing filter set-up or add_headers expansion is likely to
5239 fail for any host we try. */
5241 if (rc
== ERROR
|| (rc
== OK
&& !some_deferred
))
5243 DEBUG(D_transport
) debug_printf("Leaving %s transport\n", tblock
->name
);
5244 return TRUE
; /* Each address has its status */
5247 /* If the result was DEFER or some individual addresses deferred, let
5248 the loop run to try other hosts with the deferred addresses, except for the
5249 case when we were trying to deliver down an existing channel and failed.
5250 Don't try any other hosts in this case. */
5252 if (continue_hostname
) break;
5254 /* If the whole delivery, or some individual addresses, were deferred and
5255 there are more hosts that could be tried, do not count this host towards
5256 the hosts_max_try limit if the age of the message is greater than the
5257 maximum retry time for this host. This means we may try try all hosts,
5258 ignoring the limit, when messages have been around for some time. This is
5259 important because if we don't try all hosts, the address will never time
5260 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5262 if ((rc
== DEFER
|| some_deferred
) && nexthost
)
5265 retry_config
*retry
= retry_find_config(host
->name
, NULL
, 0, 0);
5267 if (retry
&& retry
->rules
)
5269 retry_rule
*last_rule
;
5270 for (last_rule
= retry
->rules
;
5272 last_rule
= last_rule
->next
);
5273 timedout
= time(NULL
) - received_time
.tv_sec
> last_rule
->timeout
;
5275 else timedout
= TRUE
; /* No rule => timed out */
5279 unexpired_hosts_tried
--;
5280 DEBUG(D_transport
) debug_printf("temporary delivery error(s) override "
5281 "hosts_max_try (message older than host's retry time)\n");
5287 if (unexpired_hosts_tried
>= ob
->hosts_max_try
)
5288 debug_printf("reached transport hosts_max_try limit %d\n",
5290 if (total_hosts_tried
>= ob
->hosts_max_try_hardlimit
)
5291 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5292 ob
->hosts_max_try_hardlimit
);
5295 testharness_pause_ms(500); /* let server debug out */
5296 } /* End of loop for trying multiple hosts. */
5298 /* If we failed to find a matching host in the list, for an already-open
5299 connection, just close it and start over with the list. This can happen
5300 for routing that changes from run to run, or big multi-IP sites with
5303 if (continue_hostname
&& !continue_host_tried
)
5305 int fd
= cutthrough
.cctx
.sock
>= 0 ? cutthrough
.cctx
.sock
: 0;
5307 DEBUG(D_transport
) debug_printf("no hosts match already-open connection\n");
5309 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5311 /*XXX doublecheck that! */
5313 if (cutthrough
.cctx
.sock
>= 0 && cutthrough
.is_tls
)
5315 (void) tls_write(cutthrough
.cctx
.tls_ctx
, US
"QUIT\r\n", 6, FALSE
);
5316 tls_close(cutthrough
.cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
5317 cutthrough
.cctx
.tls_ctx
= NULL
;
5318 cutthrough
.is_tls
= FALSE
;
5322 (void) write(fd
, US
"QUIT\r\n", 6);
5325 cutthrough
.cctx
.sock
= -1;
5326 continue_hostname
= NULL
;
5327 goto retry_non_continued
;
5330 /* This is the end of the loop that repeats iff expired is TRUE and
5331 ob->delay_after_cutoff is FALSE. The second time round we will
5332 try those hosts that haven't been tried since the message arrived. */
5336 debug_printf("all IP addresses skipped or deferred at least one address\n");
5337 if (expired
&& !ob
->delay_after_cutoff
&& cutoff_retry
== 0)
5338 debug_printf("retrying IP addresses not tried since message arrived\n");
5343 /* Get here if all IP addresses are skipped or defer at least one address. In
5344 MUA wrapper mode, this will happen only for connection or other non-message-
5345 specific failures. Force the delivery status for all addresses to FAIL. */
5349 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5350 addr
->transport_return
= FAIL
;
5354 /* In the normal, non-wrapper case, add a standard message to each deferred
5355 address if there hasn't been an error, that is, if it hasn't actually been
5356 tried this time. The variable "expired" will be FALSE if any deliveries were
5357 actually tried, or if there was at least one host that was not expired. That
5358 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5359 a delivery has been tried, an error code will be set, and the failing of the
5360 message is handled by the retry code later.
5362 If queue_smtp is set, or this transport was called to send a subsequent message
5363 down an existing TCP/IP connection, and something caused the host not to be
5364 found, we end up here, but can detect these cases and handle them specially. */
5366 for (address_item
* addr
= addrlist
; addr
; addr
= addr
->next
)
5368 /* If host is not NULL, it means that we stopped processing the host list
5369 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5370 means we need to behave as if some hosts were skipped because their retry
5371 time had not come. Specifically, this prevents the address from timing out.
5372 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5373 hosts were tried. */
5376 if (total_hosts_tried
>= ob
->hosts_max_try_hardlimit
)
5379 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5380 "hosts were tried\n");
5385 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5386 setflag(addr
, af_retry_skipped
);
5389 if (f
.queue_smtp
) /* no deliveries attempted */
5391 addr
->transport_return
= DEFER
;
5392 addr
->basic_errno
= 0;
5393 addr
->message
= US
"SMTP delivery explicitly queued";
5396 else if ( addr
->transport_return
== DEFER
5397 && (addr
->basic_errno
== ERRNO_UNKNOWNERROR
|| addr
->basic_errno
== 0)
5401 addr
->basic_errno
= ERRNO_HRETRY
;
5402 if (continue_hostname
)
5403 addr
->message
= US
"no host found for existing SMTP connection";
5406 setflag(addr
, af_pass_message
); /* This is not a security risk */
5407 addr
->message
= string_sprintf(
5408 "all hosts%s have been failing for a long time %s",
5409 addr
->domain
? string_sprintf(" for '%s'", addr
->domain
) : US
"",
5410 ob
->delay_after_cutoff
5411 ? US
"(and retry time not reached)"
5412 : US
"and were last tried after this message arrived");
5414 /* If we are already using fallback hosts, or there are no fallback hosts
5415 defined, convert the result to FAIL to cause a bounce. */
5417 if (addr
->host_list
== addr
->fallback_hosts
|| !addr
->fallback_hosts
)
5418 addr
->transport_return
= FAIL
;
5423 if (hosts_retry
== hosts_total
)
5424 s
= "retry time not reached for any host%s";
5425 else if (hosts_fail
== hosts_total
)
5426 s
= "all host address lookups%s failed permanently";
5427 else if (hosts_defer
== hosts_total
)
5428 s
= "all host address lookups%s failed temporarily";
5429 else if (hosts_serial
== hosts_total
)
5430 s
= "connection limit reached for all hosts%s";
5431 else if (hosts_fail
+hosts_defer
== hosts_total
)
5432 s
= "all host address lookups%s failed";
5434 s
= "some host address lookups failed and retry time "
5435 "not reached for other hosts or connection limit reached%s";
5437 addr
->message
= string_sprintf(s
,
5438 addr
->domain
? string_sprintf(" for '%s'", addr
->domain
) : US
"");
5443 /* Update the database which keeps information about which messages are waiting
5444 for which hosts to become available. For some message-specific errors, the
5445 update_waiting flag is turned off because we don't want follow-on deliveries in
5446 those cases. If this transport instance is explicitly limited to one message
5447 per connection then follow-on deliveries are not possible and there's no need
5448 to create/update the per-transport wait-<transport_name> database. */
5450 if (update_waiting
&& tblock
->connection_max_messages
!= 1)
5451 transport_update_waiting(hostlist
, tblock
->name
);
5455 DEBUG(D_transport
) debug_printf("Leaving %s transport\n", tblock
->name
);
5457 return TRUE
; /* Each address has its status */
5460 #endif /*!MACRO_PREDEF*/
5463 /* End of transport/smtp.c */