1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2023 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 /* Definitions of various structures. In addition, those that are visible for
12 the compilation of local_scan() are defined in local_scan.h. These are
18 For those declared here, we have to pre-declare some because of mutually
19 recursive definitions in the auths, routers, and transports blocks. */
27 struct transport_info;
31 typedef struct gstring {
32 int size; /* Current capacity of string memory */
33 int ptr; /* Offset at which to append further chars */
34 uschar * s; /* The string memory */
37 /* Structure for remembering macros for the configuration file */
39 typedef struct macro_item {
40 struct macro_item * next;
45 const uschar * replacement;
48 /* Structure for bit tables for debugging and logging */
50 typedef struct bit_table {
55 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
57 typedef struct ugid_block {
65 typedef enum { CHUNKING_NOT_OFFERED = -1,
68 CHUNKING_LAST} chunking_state_t;
70 typedef enum { TFO_NOT_USED = 0,
74 TFO_USED_DATA } tfo_state_t;
76 /* Structure for holding information about a host for use mainly by routers,
77 but also used when checking lists of hosts and when transporting. Looking up
78 host addresses is done using this structure. */
80 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
82 typedef struct host_item {
83 struct host_item *next;
84 const uschar *name; /* Host name */
86 const uschar *certname; /* Name used for certificate checks */
88 const uschar *address; /* IP address in text form */
89 int port; /* port value in host order (if SRV lookup) */
90 int mx; /* MX value if found via MX records */
91 int sort_key; /* MX*1000 plus random "fraction" */
92 int status; /* Usable, unusable, or unknown */
93 int why; /* Why host is unusable */
94 int last_try; /* Time of last try if known */
95 dnssec_status_t dnssec;
98 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
99 rewrite_headers field of a transport. */
101 typedef struct rewrite_rule {
102 struct rewrite_rule *next;
108 /* This structure is used to pass back configuration data from the smtp
109 transport to the outside world. It is used during callback processing. If ever
110 another remote transport were implemented, it could use the same structure. */
112 typedef struct transport_feedback {
119 BOOL hosts_randomize;
123 } transport_feedback;
125 /* Routers, transports, and authenticators have similar data blocks. Each
126 driver that is compiled into the code is represented by a xxx_info block; the
127 active drivers are represented by a chain of xxx_instance blocks. To make it
128 possible to use the same code for reading the configuration files for all
129 three, the layout of the start of the blocks is kept the same, and represented
130 by the generic structures driver_info and driver_instance. */
132 typedef struct driver_instance {
133 struct driver_instance *next;
134 uschar *name; /* Instance name */
135 struct driver_info *info; /* Points to info for this driver */
136 void *options_block; /* Pointer to private options */
138 uschar *driver_name; /* All start with this generic option */
139 const uschar *srcfile; /* and config source info for errors */
143 typedef struct driver_info {
144 uschar *driver_name; /* Name of driver */
146 optionlist *options; /* Table of private options names */
147 int *options_count; /* -> Number of entries in table */
148 void *options_block; /* Points to default private block */
149 int options_len; /* Length of same in bytes */
150 void (*init)( /* Initialization entry point */
151 struct driver_instance *);
155 /* Structure for holding information about the configured transports. Some
156 of the generally accessible options are set from the configuration file; others
157 are set by transport initialization, since they can only be set for certain
158 transports. They need to be generally accessible, however, as they are used by
159 the main transport code. */
161 typedef struct transport_instance {
162 struct transport_instance *next;
163 uschar *name; /* Instance name */
164 struct transport_info *info; /* Info for this driver */
165 void *options_block; /* Pointer to private options */
166 uschar *driver_name; /* Must be first */
167 const uschar *srcfile;
170 int (*setup)( /* Setup entry point */
171 struct transport_instance *,
172 struct address_item *,
173 struct transport_feedback *, /* For passing back config data */
174 uid_t, /* The uid that will be used */
175 gid_t, /* The gid that will be used */
176 uschar **); /* For an error message */
177 /**************************************/
178 int batch_max; /* ) */
179 uschar *batch_id; /* ) */
180 uschar *home_dir; /* ) Used only for local transports */
181 uschar *current_dir; /* ) */
182 /**************************************/
183 uschar *expand_multi_domain; /* ) */
184 BOOL multi_domain; /* ) */
185 BOOL overrides_hosts; /* ) Used only for remote transports */
186 uschar *max_addresses; /* ) */
187 int connection_max_messages;/* ) */
188 /**************************************/
189 BOOL deliver_as_creator; /* Used only by pipe at present */
190 BOOL disable_logging; /* For very weird requirements */
191 BOOL initgroups; /* Initialize groups when setting uid */
192 BOOL uid_set; /* uid is set */
193 BOOL gid_set; /* gid is set */
196 uschar *expand_uid; /* Variable uid */
197 uschar *expand_gid; /* Variable gid */
198 uschar *warn_message; /* Used only by appendfile at present */
199 uschar *shadow; /* Name of shadow transport */
200 uschar *shadow_condition; /* Condition for running it */
201 uschar *filter_command; /* For on-the-fly-filtering */
202 uschar *add_headers; /* Add these headers */
203 uschar *remove_headers; /* Remove these headers */
204 uschar *return_path; /* Overriding (rewriting) return path */
205 uschar *debug_string; /* Debugging output */
206 uschar *max_parallel; /* Number of concurrent instances */
207 uschar *message_size_limit; /* Biggest message this transport handles */
208 uschar *headers_rewrite; /* Rules for rewriting headers */
209 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
210 int rewrite_existflags; /* Bits showing which headers are rewritten */
211 int filter_timeout; /* For transport filter timing */
212 BOOL body_only; /* Deliver only the body */
213 BOOL delivery_date_add; /* Add Delivery-Date header */
214 BOOL envelope_to_add; /* Add Envelope-To header */
215 BOOL headers_only; /* Deliver only the headers */
216 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
217 BOOL return_path_add; /* Add Return-Path header */
218 BOOL return_output; /* TRUE if output should always be returned */
219 BOOL return_fail_output; /* ditto, but only on failure */
220 BOOL log_output; /* Similarly for logging */
221 BOOL log_fail_output;
222 BOOL log_defer_output;
223 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
224 #ifndef DISABLE_EVENT
225 uschar *event_action; /* String to expand on notable events */
227 } transport_instance;
230 /* Structure for holding information about a type of transport. The first six
231 fields must match driver_info above. */
233 typedef struct transport_info {
234 uschar *driver_name; /* Driver name */
235 optionlist *options; /* Table of private options names */
236 int *options_count; /* -> Number of entries in table */
237 void *options_block; /* Points to default private block */
238 int options_len; /* Length of same in bytes */
239 void (*init)( /* Initialization function */
240 struct transport_instance *);
242 BOOL (*code)( /* Main entry point */
243 transport_instance *,
244 struct address_item *);
245 void (*tidyup)( /* Tidyup function */
246 struct transport_instance *);
247 void (*closedown)( /* For closing down a passed channel */
248 struct transport_instance *);
249 BOOL local; /* TRUE for local transports */
253 /* smtp transport datachunk callback */
255 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
256 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
258 struct transport_context;
259 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
261 /* Structure for information about a delivery-in-progress */
263 typedef struct transport_context {
264 union { /* discriminated by option topt_output_string */
265 int fd; /* file descriptor to write message to */
266 gstring * msg; /* allocated string with written message */
268 transport_instance * tblock; /* transport */
269 struct address_item * addr;
270 uschar * check_string; /* string replacement */
271 uschar * escape_string;
272 int options; /* output processing topt_* */
274 /* items below only used with option topt_use_bdat */
275 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
286 /* Structure for holding information about the configured routers. */
288 typedef struct router_instance {
289 struct router_instance *next;
291 struct router_info *info;
292 void *options_block; /* Pointer to private options */
293 uschar *driver_name; /* Must be first */
294 const uschar *srcfile;
297 uschar *address_data; /* Arbitrary data */
298 #ifdef EXPERIMENTAL_BRIGHTMAIL
299 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
301 uschar *cannot_route_message; /* Used when routing fails */
302 uschar *condition; /* General condition */
303 uschar *current_directory; /* For use during delivery */
304 uschar *debug_string; /* Debugging output */
305 uschar *domains; /* Specific domains */
306 uschar *errors_to; /* Errors address */
307 uschar *expand_gid; /* Expanded gid string */
308 uschar *expand_uid; /* Expanded uid string */
309 uschar *expand_more; /* Expanded more string */
310 uschar *expand_unseen; /* Expanded unseen string */
311 uschar *extra_headers; /* Additional headers */
312 uschar *fallback_hosts; /* For remote transports (text list) */
313 uschar *home_directory; /* For use during delivery */
314 uschar *ignore_target_hosts; /* Target hosts to ignore */
315 uschar *local_parts; /* Specific local parts */
316 uschar *pass_router_name; /* Router for passed address */
317 uschar *prefix; /* Address prefix */
318 uschar *redirect_router_name; /* Router for generated address */
319 uschar *remove_headers; /* Removed headers */
320 uschar *require_files; /* File checks before router is run */
321 uschar *router_home_directory; /* For use while routing */
322 uschar *self; /* Text option for handling self reference */
323 uschar *senders; /* Specific senders */
324 uschar *suffix; /* Address suffix */
325 uschar *translate_ip_address; /* IP address translation fudgery */
326 uschar *transport_name; /* Transport name */
328 BOOL address_test; /* Use this router when testing addresses */
329 #ifdef EXPERIMENTAL_BRIGHTMAIL
330 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
331 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
332 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
334 BOOL expn; /* Use this router when processing EXPN */
335 BOOL caseful_local_part; /* TRUE => don't lowercase */
336 BOOL check_local_user; /* TRUE => check local user */
337 BOOL disable_logging; /* For very weird requirements */
338 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
339 BOOL fail_verify_sender; /* Fail verify if sender match this router */
340 BOOL gid_set; /* Flag to indicate gid is set */
341 BOOL initgroups; /* TRUE if initgroups is required */
342 BOOL log_as_local; /* TRUE logs as a local delivery */
343 BOOL more; /* If FALSE, do no more if this one fails */
344 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
345 BOOL prefix_optional; /* Just what it says */
346 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
347 BOOL retry_use_local_part; /* Just what it says */
348 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
349 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
350 uschar *set; /* Variable = value to set; list */
351 BOOL suffix_optional; /* As it says */
352 BOOL verify_only; /* Skip this router if not verifying */
353 BOOL verify_recipient; /* Use this router when verifying a recipient*/
354 BOOL verify_sender; /* Use this router when verifying a sender */
355 BOOL uid_set; /* Flag to indicate uid is set */
356 BOOL unseen; /* If TRUE carry on, even after success */
357 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
359 int self_code; /* Encoded version of "self" */
360 uid_t uid; /* Fixed uid value */
361 gid_t gid; /* Fixed gid value */
363 host_item *fallback_hostlist; /* For remote transport (block chain) */
364 transport_instance *transport; /* Transport block (when found) */
365 struct router_instance *pass_router; /* Actual router for passed address */
366 struct router_instance *redirect_router; /* Actual router for generated address */
368 dnssec_domains dnssec;
372 /* Structure for holding information about a type of router. The first six
373 fields must match driver_info above. */
375 typedef struct router_info {
377 optionlist *options; /* Table of private options names */
378 int *options_count; /* -> Number of entries in table */
379 void *options_block; /* Points to default private block */
380 int options_len; /* Length of same in bytes */
381 void (*init)( /* Initialization function */
382 struct router_instance *);
384 int (*code)( /* Main entry point */
386 struct address_item *,
389 struct address_item **,
390 struct address_item **,
391 struct address_item **,
392 struct address_item **);
393 void (*tidyup)( /* Tidyup function */
394 struct router_instance *);
395 int ri_flags; /* Descriptive flags */
399 /* Structure for holding information about a lookup type. */
401 #include "lookupapi.h"
404 /* Structure for holding information about the configured authentication
407 typedef struct auth_instance {
408 struct auth_instance *next;
409 uschar *name; /* Exim instance name */
410 struct auth_info *info; /* Pointer to driver info block */
411 void *options_block; /* Pointer to private options */
412 uschar *driver_name; /* Must be first */
413 const uschar *srcfile;
416 uschar *advertise_condition; /* Are we going to advertise this?*/
417 uschar *client_condition; /* Should the client try this? */
418 uschar *public_name; /* Advertised name */
419 uschar *set_id; /* String to set when server as authenticated id */
420 uschar *set_client_id; /* String to set when client as client_authenticated id */
421 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
422 uschar *server_debug_string; /* Debugging output */
423 uschar *server_condition; /* Authorization condition */
424 BOOL client; /* TRUE if client option(s) set */
425 BOOL server; /* TRUE if server options(s) set */
426 BOOL advertised; /* Set TRUE when advertised */
430 /* Structure for holding information about an authentication mechanism. The
431 first six fields must match driver_info above. */
433 typedef struct auth_info {
434 uschar *driver_name; /* e.g. "condition" */
435 optionlist *options; /* Table of private options names */
436 int *options_count; /* -> Number of entries in table */
437 void *options_block; /* Points to default private block */
438 int options_len; /* Length of same in bytes */
439 void (*init)( /* initialization function */
440 struct auth_instance *);
442 int (*servercode)( /* server function */
443 auth_instance *, /* the instance data */
444 uschar *); /* rest of AUTH command */
445 int (*clientcode)( /* client function */
446 struct auth_instance *,
447 void *, /* smtp conn, with socket, output and input buffers */
448 int, /* command timeout */
449 uschar *, /* buffer for reading response */
450 int); /* sizeof buffer */
451 gstring * (*version_report)( /* diagnostic version reporting */
452 gstring *); /* string to append to */
453 void (*macros_create)(void); /* feature-macro creation */
457 /* Structure for holding a single IP address and port; used for the chain of
458 addresses and ports for the local host. Make the char string large enough to
459 hold an IPv6 address. */
461 typedef struct ip_address_item {
462 struct ip_address_item *next;
464 BOOL v6_include_v4; /* Used in the daemon */
466 uschar * log; /* portion of "listening on" log line */
469 /* Structure for chaining together arbitrary strings. */
471 typedef struct string_item {
472 struct string_item * next;
476 /* Information about a soft delivery failure, for use when calculating
477 retry information. It's separate from the address block, because there
478 can be a chain of them for SMTP deliveries where multiple IP addresses
481 typedef struct retry_item {
482 struct retry_item *next; /* for chaining */
483 uschar *key; /* string identifying host/address/message */
484 int basic_errno; /* error code for this destination */
485 int more_errno; /* additional error information */
486 uschar *message; /* local error message */
487 int flags; /* see below */
490 /* Retry data flags */
492 #define rf_delete 0x0001 /* retry info is to be deleted */
493 #define rf_host 0x0002 /* retry info is for a remote host */
494 #define rf_message 0x0004 /* retry info is for a host+message */
496 /* Information about a constructed message that is to be sent using the
497 autoreply transport. This is pointed to from the address block. */
499 typedef struct reply_item {
500 uschar *from; /* ) */
501 uschar *reply_to; /* ) */
503 uschar *cc; /* ) specific header fields */
505 uschar *subject; /* ) */
506 uschar *headers; /* misc other headers, concatenated */
507 uschar *text; /* text string body */
508 uschar *file; /* file body */
509 BOOL file_expand; /* expand the body */
510 int expand_forbid; /* expansion lockout flags */
511 uschar *logfile; /* file to keep a log in */
512 uschar *oncelog; /* file to keep records in for once only */
513 time_t once_repeat; /* time to repeat "once only" */
514 BOOL return_message; /* send back the original message */
518 /* The address_item structure contains many fields which are used at various
519 times while delivering a message. Some are used only for remote deliveries;
520 some only for local. A particular set of fields is copied whenever a child
521 address is created. For convenience, we keep those fields in a separate
522 sub-structure so they can be copied in one go. This also means I won't forget
523 to edit the various copying places when new to-be-copied fields are added. */
525 typedef struct address_item_propagated {
526 uschar *address_data; /* arbitrary data to keep with the address */
527 uschar *domain_data; /* from "domains" lookup */
528 uschar *localpart_data; /* from "local_parts" lookup */
529 uschar *errors_address; /* where to send errors (NULL => sender) */
530 header_line *extra_headers; /* additional headers */
531 uschar *remove_headers; /* list of those to remove */
532 void *variables; /* router-vasriables */
534 BOOL ignore_error:1; /* ignore delivery error */
536 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
537 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
538 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
540 } address_item_propagated;
543 /* The main address structure. Note that fields that are to be copied to
544 generated addresses should be put in the address_item_propagated structure (see
545 above) rather than directly into the address_item structure. */
547 typedef struct address_item {
548 struct address_item *next; /* for chaining addresses */
549 struct address_item *parent; /* parent address */
550 struct address_item *first; /* points to first after group delivery */
551 struct address_item *dupof; /* points to address this is a duplicate of */
553 router_instance *start_router; /* generated address starts here */
554 router_instance *router; /* the router that routed */
555 transport_instance *transport; /* the transport to use */
557 host_item *host_list; /* host data for the transport */
558 host_item *host_used; /* host that took delivery or failed hard */
559 host_item *fallback_hosts; /* to try if delivery defers */
561 reply_item *reply; /* data for autoreply */
562 retry_item *retries; /* chain of retry information */
564 uschar *address; /* address being delivered or routed */
565 uschar *unique; /* used for disambiguating */
566 uschar *cc_local_part; /* caseful local part */
567 uschar *lc_local_part; /* lowercased local part */
568 uschar *local_part; /* points to cc or lc version */
569 uschar *prefix; /* stripped prefix of local part */
570 uschar *prefix_v; /* variable part of above */
571 uschar *suffix; /* stripped suffix of local part */
572 uschar *suffix_v; /* variable part of above */
573 const uschar *domain; /* working domain (lower cased) */
575 uschar *address_retry_key; /* retry key including full address */
576 uschar *domain_retry_key; /* retry key for domain only */
578 uschar *current_dir; /* current directory for transporting */
579 uschar *home_dir; /* home directory for transporting */
580 uschar *message; /* error message */
581 uschar *user_message; /* error message that can be sent over SMTP
582 or quoted in bounce message */
583 uschar *onetime_parent; /* saved original parent for onetime */
584 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
585 uschar *return_filename; /* name of return file */
586 uschar *self_hostname; /* after self=pass */
587 uschar *shadow_message; /* info about shadow transporting */
590 const uschar *tlsver; /* version used for transport */
591 uschar *cipher; /* Cipher used for transport */
592 void *ourcert; /* Certificate offered to peer, binary */
593 void *peercert; /* Certificate from peer, binary */
594 uschar *peerdn; /* DN of server's certificate */
595 int ocsp; /* OCSP status of peer cert */
598 #ifdef EXPERIMENTAL_DSN_INFO
599 const uschar *smtp_greeting; /* peer self-identification */
600 const uschar *helo_response; /* peer message */
603 uschar *authenticator; /* auth driver name used by transport */
604 uschar *auth_id; /* auth "login" name used by transport */
605 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
607 uschar *dsn_orcpt; /* DSN orcpt value */
608 int dsn_flags; /* DSN flags */
609 int dsn_aware; /* DSN aware flag */
611 uid_t uid; /* uid for transporting */
612 gid_t gid; /* gid for transporting */
616 BOOL af_allow_file:1; /* allow file in generated address */
617 BOOL af_allow_pipe:1; /* allow pipe in generated address */
618 BOOL af_allow_reply:1; /* allow autoreply in generated address */
619 BOOL af_dr_retry_exists:1; /* router retry record exists */
620 BOOL af_expand_pipe:1; /* expand pipe arguments */
621 BOOL af_file:1; /* file delivery; always with pfr */
622 BOOL af_gid_set:1; /* gid field is set */
623 BOOL af_home_expanded:1; /* home_dir is already expanded */
624 BOOL af_initgroups:1; /* use initgroups() for local transporting */
625 BOOL af_local_host_removed:1; /* local host was backup */
626 BOOL af_lt_retry_exists:1; /* local transport retry exists */
627 BOOL af_pfr:1; /* pipe or file or reply delivery */
628 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
629 BOOL af_retry_timedout:1; /* true if retry timed out */
630 BOOL af_uid_set:1; /* uid field is set */
631 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
632 BOOL af_sverify_told:1; /* sender verify failure notified */
633 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
634 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
635 BOOL af_homonym:1; /* an ancestor has same address */
636 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
637 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
638 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
639 BOOL af_new_conn:1; /* delivered on an fresh TCP conn */
640 BOOL af_cont_conn:1; /* delivered (with new MAIL cmd) on an existing TCP conn */
641 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
642 BOOL af_pass_message:1; /* pass message in bounces */
643 BOOL af_bad_reply:1; /* filter could not generate autoreply */
644 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
645 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
646 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
647 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
648 #ifndef DISABLE_PIPE_CONNECT
649 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
652 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
654 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
655 BOOL af_force_command:1; /* force_command in pipe transport */
657 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
660 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
662 #ifndef DISABLE_TLS_RESUME
663 BOOL af_tls_resume:1; /* TLS used a resumed session */
667 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
668 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
669 int mode; /* mode for local transporting to a file */
670 int basic_errno; /* status after failure */
671 int more_errno; /* additional error information */
672 struct timeval delivery_time; /* time taken to do delivery/attempt */
674 unsigned short child_count; /* number of child addresses */
675 short int return_file; /* fileno of return data file */
676 short int special_action; /* ( used when when deferred or failed */
678 /* ( contains = or - when successful SMTP delivered */
680 /* ( contains verify rc in sender verify cache */
681 short int transport_return; /* result of delivery attempt */
682 address_item_propagated prop; /* fields that are propagated to children */
685 /* The table of header names consists of items of this type */
694 /* Chain of information about errors (e.g. bad addresses) */
696 typedef struct error_block {
697 struct error_block *next;
702 /* Chain of file names when processing the queue */
704 typedef struct queue_filename {
705 struct queue_filename *next;
710 /* Chain of items of retry information, read from the retry config. */
712 typedef struct retry_rule {
713 struct retry_rule *next;
720 typedef struct retry_config {
721 struct retry_config *next;
729 /* Structure for each node in a tree, of which there are various kinds */
731 typedef struct tree_node {
732 struct tree_node *left; /* pointer to left child */
733 struct tree_node *right; /* pointer to right child */
736 void *ptr; /* pointer to data */
737 int val; /* or integer data */
739 uschar balance; /* balancing factor */
740 uschar name[1]; /* node name - variable length */
743 /* Structure for holding time-limited data such as DNS returns.
744 We use this rather than extending tree_node to avoid wasting
745 space for most tree use (variables...) at the cost of complexity
746 for the lookups cache.
747 We also store any options used for the lookup. */
749 typedef struct expiring_data {
750 time_t expiry; /* if nonzero, data invalid after this time */
751 const uschar * opts; /* options, or NULL */
754 void * ptr; /* pointer to data */
755 int val; /* or integer data */
759 /* Structure for holding the handle and the cached last lookup for searches.
760 This block is pointed to by the tree entry for the file. The file can get
761 closed if too many are opened at once. There is a LRU chain for deciding which
764 typedef struct search_cache {
765 void *handle; /* lookup handle, or NULL if closed */
766 int search_type; /* search type */
767 tree_node *up; /* LRU up pointer */
768 tree_node *down; /* LRU down pointer */
769 tree_node *item_cache; /* tree of cached results */
772 /* Structure for holding a partially decoded DNS record; the name has been
773 uncompressed, but the data pointer is into the raw data. */
776 uschar name[DNS_MAXNAME]; /* domain name */
777 int type; /* record type */
778 unsigned short ttl; /* time-to-live, seconds */
779 int size; /* size of data */
780 const uschar *data; /* pointer to data */
783 /* Structure for holding the result of a DNS query. A touch over
784 64k big, so take care to release as soon as possible. */
787 int answerlen; /* length of the answer */
788 uschar answer[NS_MAXMSG]; /* the answer itself */
791 /* Structure for holding the intermediate data while scanning a DNS answer
795 int rrcount; /* count of RRs in the answer */
796 const uschar *aptr; /* pointer in the answer while scanning */
797 dns_record srr; /* data from current record in scan */
800 /* Structure for holding a chain of IP addresses that are extracted from
801 an A, AAAA, or A6 record. For the first two, there is only ever one address,
802 but the chaining feature of A6 allows for several addresses to be realized from
803 a single initial A6 record. The structure defines the address field of length
804 1. In use, a suitable sized block is obtained to hold the complete textual
807 typedef struct dns_address {
808 struct dns_address *next;
812 /* Structure used for holding intermediate data during MD5 computations. */
816 unsigned int abcd[4];
820 /* Structure used for holding intermediate data during SHA-1 computations. */
822 typedef struct sha1 {
827 /* Information for making an smtp connection */
829 transport_instance * tblock;
830 void * ob; /* smtp_transport_options_block * */
835 int sock; /* used for a bound but not connected socket */
836 uschar * sending_ip_address; /* used for TLS resumption */
837 const uschar * host_lbserver; /* ditto, for server-behind LB */
838 BOOL have_lbserver:1; /* host_lbserver is valid */
841 BOOL dane:1; /* connection must do dane */
842 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
846 /* A client-initiated connection. If TLS, the second element is non-NULL */
853 /* Structure used to hold incoming packets of SMTP responses for a specific
854 socket. The packets which may contain multiple lines (and in some cases,
855 multiple responses). */
857 typedef struct smtp_inblock {
858 client_conn_ctx * cctx; /* the connection */
859 int buffersize; /* the size of the buffer */
860 uschar *ptr; /* current position in the buffer */
861 uschar *ptrend; /* end of data in the buffer */
862 uschar *buffer; /* the buffer itself */
865 /* Structure used to hold buffered outgoing packets of SMTP commands for a
866 specific socket. The packets which may contain multiple lines when pipelining
869 typedef struct smtp_outblock {
870 client_conn_ctx * cctx; /* the connection */
871 int cmd_count; /* count of buffered commands */
872 int buffersize; /* the size of the buffer */
873 BOOL authenticating; /* TRUE when authenticating */
874 uschar *ptr; /* current position in the buffer */
875 uschar *buffer; /* the buffer itself */
877 smtp_connect_args * conn_args; /* to make connection, if not yet made */
880 /* Structure to hold information about the source of redirection information */
882 typedef struct redirect_block {
883 uschar *string; /* file name or string */
884 uid_t *owners; /* allowed file owners */
885 gid_t *owngroups; /* allowed file groups */
886 struct passwd *pw; /* possible owner if not NULL */
887 int modemask; /* forbidden bits */
888 BOOL isfile; /* TRUE if string is a file name */
889 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
890 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
893 /* Structure for passing arguments to check_host() */
895 typedef struct check_host_block {
896 const uschar *host_name;
897 const uschar *host_address;
898 const uschar *host_ipv4;
902 /* Structure for remembering lookup data when caching the result of
903 a lookup in a named list. */
905 typedef struct namedlist_cacheblock {
906 struct namedlist_cacheblock *next;
909 } namedlist_cacheblock;
911 /* Structure for holding data for an entry in a named list */
913 typedef struct namedlist_block {
914 const uschar *string; /* the list string */
915 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
916 short number; /* the number of the list for caching */
917 BOOL hide; /* -bP does not display value */
920 /* Structures for Access Control Lists */
922 typedef struct acl_condition_block {
923 struct acl_condition_block * next;
930 } acl_condition_block;
932 typedef struct acl_block {
933 struct acl_block * next;
934 acl_condition_block * condition;
937 const uschar * srcfile;
940 /* smtp transport calc outbound_ip */
941 typedef BOOL (*oicf) (uschar *message_id, void *data);
943 /* DKIM information for transport */
946 uschar *dkim_identity;
947 uschar *dkim_private_key;
948 uschar *dkim_selector;
950 uschar *dkim_sign_headers;
953 uschar *dkim_timestamps;
956 #ifdef EXPERIMENTAL_ARC
957 uschar *arc_signspec;
962 /* per-queue-runner info */
963 typedef struct qrunner {
964 struct qrunner * next; /* list sorted by next tick */
966 uschar * name; /* NULL for the default queue */
967 unsigned interval; /* tick rate, seconds */
968 time_t next_tick; /* next run should, or should have, start(ed) */
969 unsigned run_max; /* concurrent queue runner limit */
970 unsigned run_count; /* current runners */
972 BOOL queue_run_force :1;
973 BOOL deliver_force_thaw :1;
974 BOOL queue_run_first_delivery :1;
975 BOOL queue_run_local :1;
976 BOOL queue_2stage :1;
979 /* End of structs.h */