1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
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 {
134 uschar *name; /* Instance name */
135 void *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 driver_instance drinst;
164 int (*setup)( /* Setup entry point */
165 struct transport_instance *,
166 struct address_item *,
167 struct transport_feedback *, /* For passing back config data */
168 uid_t, /* The uid that will be used */
169 gid_t, /* The gid that will be used */
170 uschar **); /* For an error message */
171 /**************************************/
172 int batch_max; /* ) */
173 uschar *batch_id; /* ) */
174 uschar *home_dir; /* ) Used only for local transports */
175 uschar *current_dir; /* ) */
176 /**************************************/
177 uschar *expand_multi_domain; /* ) */
178 BOOL multi_domain; /* ) */
179 BOOL overrides_hosts; /* ) Used only for remote transports */
180 uschar *max_addresses; /* ) */
181 int connection_max_messages;/* ) */
182 /**************************************/
183 BOOL deliver_as_creator; /* Used only by pipe at present */
184 BOOL disable_logging; /* For very weird requirements */
185 BOOL initgroups; /* Initialize groups when setting uid */
186 BOOL uid_set; /* uid is set */
187 BOOL gid_set; /* gid is set */
190 uschar *expand_uid; /* Variable uid */
191 uschar *expand_gid; /* Variable gid */
192 uschar *warn_message; /* Used only by appendfile at present */
193 uschar *shadow; /* Name of shadow transport */
194 uschar *shadow_condition; /* Condition for running it */
195 uschar *filter_command; /* For on-the-fly-filtering */
196 uschar *add_headers; /* Add these headers */
197 uschar *remove_headers; /* Remove these headers */
198 uschar *return_path; /* Overriding (rewriting) return path */
199 uschar *debug_string; /* Debugging output */
200 uschar *max_parallel; /* Number of concurrent instances */
201 uschar *message_size_limit; /* Biggest message this transport handles */
202 uschar *headers_rewrite; /* Rules for rewriting headers */
203 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
204 int rewrite_existflags; /* Bits showing which headers are rewritten */
205 int filter_timeout; /* For transport filter timing */
206 BOOL body_only; /* Deliver only the body */
207 BOOL delivery_date_add; /* Add Delivery-Date header */
208 BOOL envelope_to_add; /* Add Envelope-To header */
209 BOOL headers_only; /* Deliver only the headers */
210 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
211 BOOL return_path_add; /* Add Return-Path header */
212 BOOL return_output; /* TRUE if output should always be returned */
213 BOOL return_fail_output; /* ditto, but only on failure */
214 BOOL log_output; /* Similarly for logging */
215 BOOL log_fail_output;
216 BOOL log_defer_output;
217 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
218 #ifndef DISABLE_EVENT
219 uschar *event_action; /* String to expand on notable events */
221 } transport_instance;
224 /* Structure for holding information about a type of transport. The first
225 element must be a struct driver_info, to match auths and routers. */
227 typedef struct transport_info {
230 BOOL (*code)( /* Main entry point */
231 transport_instance *,
232 struct address_item *);
233 void (*tidyup)( /* Tidyup function */
234 struct transport_instance *);
235 void (*closedown)( /* For closing down a passed channel */
236 struct transport_instance *);
237 BOOL local; /* TRUE for local transports */
241 /* smtp transport datachunk callback */
243 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
244 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
246 struct transport_context;
247 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
249 /* Structure for information about a delivery-in-progress */
251 typedef struct transport_context {
252 union { /* discriminated by option topt_output_string */
253 int fd; /* file descriptor to write message to */
254 gstring * msg; /* allocated string with written message */
256 transport_instance * tblock; /* transport */
257 struct address_item * addr;
258 uschar * check_string; /* string replacement */
259 uschar * escape_string;
260 int options; /* output processing topt_* */
262 /* items below only used with option topt_use_bdat */
263 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
274 /* Structure for holding information about the configured routers. */
276 typedef struct router_instance {
277 driver_instance drinst;
279 uschar *address_data; /* Arbitrary data */
280 #ifdef EXPERIMENTAL_BRIGHTMAIL
281 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
283 uschar *cannot_route_message; /* Used when routing fails */
284 uschar *condition; /* General condition */
285 uschar *current_directory; /* For use during delivery */
286 uschar *debug_string; /* Debugging output */
287 uschar *domains; /* Specific domains */
288 uschar *errors_to; /* Errors address */
289 uschar *expand_gid; /* Expanded gid string */
290 uschar *expand_uid; /* Expanded uid string */
291 uschar *expand_more; /* Expanded more string */
292 uschar *expand_unseen; /* Expanded unseen string */
293 uschar *extra_headers; /* Additional headers */
294 uschar *fallback_hosts; /* For remote transports (text list) */
295 uschar *home_directory; /* For use during delivery */
296 uschar *ignore_target_hosts; /* Target hosts to ignore */
297 uschar *local_parts; /* Specific local parts */
298 uschar *pass_router_name; /* Router for passed address */
299 uschar *prefix; /* Address prefix */
300 uschar *redirect_router_name; /* Router for generated address */
301 uschar *remove_headers; /* Removed headers */
302 uschar *require_files; /* File checks before router is run */
303 uschar *router_home_directory; /* For use while routing */
304 uschar *self; /* Text option for handling self reference */
305 uschar *senders; /* Specific senders */
306 uschar *suffix; /* Address suffix */
307 uschar *translate_ip_address; /* IP address translation fudgery */
308 uschar *transport_name; /* Transport name */
310 BOOL address_test; /* Use this router when testing addresses */
311 #ifdef EXPERIMENTAL_BRIGHTMAIL
312 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
313 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
314 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
316 BOOL expn; /* Use this router when processing EXPN */
317 BOOL caseful_local_part; /* TRUE => don't lowercase */
318 BOOL check_local_user; /* TRUE => check local user */
319 BOOL disable_logging; /* For very weird requirements */
320 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
321 BOOL fail_verify_sender; /* Fail verify if sender match this router */
322 BOOL gid_set; /* Flag to indicate gid is set */
323 BOOL initgroups; /* TRUE if initgroups is required */
324 BOOL log_as_local; /* TRUE logs as a local delivery */
325 BOOL more; /* If FALSE, do no more if this one fails */
326 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
327 BOOL prefix_optional; /* Just what it says */
328 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
329 BOOL retry_use_local_part; /* Just what it says */
330 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
331 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
332 uschar *set; /* Variable = value to set; list */
333 BOOL suffix_optional; /* As it says */
334 BOOL verify_only; /* Skip this router if not verifying */
335 BOOL verify_recipient; /* Use this router when verifying a recipient*/
336 BOOL verify_sender; /* Use this router when verifying a sender */
337 BOOL uid_set; /* Flag to indicate uid is set */
338 BOOL unseen; /* If TRUE carry on, even after success */
339 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
341 int self_code; /* Encoded version of "self" */
342 uid_t uid; /* Fixed uid value */
343 gid_t gid; /* Fixed gid value */
345 host_item *fallback_hostlist; /* For remote transport (block chain) */
346 transport_instance *transport; /* Transport block (when found) */
347 struct router_instance *pass_router; /* Actual router for passed address */
348 struct router_instance *redirect_router; /* Actual router for generated address */
350 dnssec_domains dnssec;
354 /* Structure for holding information about a type of router. The first element
355 must be a struct driver_info, to match auths and transports. */
357 typedef struct router_info {
360 int (*code)( /* Main entry point */
362 struct address_item *,
365 struct address_item **,
366 struct address_item **,
367 struct address_item **,
368 struct address_item **);
369 void (*tidyup)( /* Tidyup function */
370 struct router_instance *);
371 int ri_flags; /* Descriptive flags */
375 /* Structure for holding information about a lookup type. */
377 #include "lookupapi.h"
380 /* Structure for holding information about the configured authentication
383 typedef struct auth_instance {
384 driver_instance drinst;
386 uschar *advertise_condition; /* Are we going to advertise this?*/
387 uschar *client_condition; /* Should the client try this? */
388 uschar *public_name; /* Advertised name */
389 uschar *set_id; /* String to set when server as authenticated id */
390 uschar *set_client_id; /* String to set when client as client_authenticated id */
391 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
392 uschar *server_debug_string; /* Debugging output */
393 uschar *server_condition; /* Authorization condition */
394 BOOL client; /* TRUE if client option(s) set */
395 BOOL server; /* TRUE if server options(s) set */
396 BOOL advertised; /* Set TRUE when advertised */
400 /* Structure for holding information about an authentication mechanism. The
401 first element must be a struct driver_info, to match routers and transports. */
403 typedef struct auth_info {
406 int (*servercode)( /* server function */
407 auth_instance *, /* the instance data */
408 uschar *); /* rest of AUTH command */
409 int (*clientcode)( /* client function */
410 struct auth_instance *,
411 void *, /* smtp conn, with socket, output and input buffers */
412 int, /* command timeout */
413 uschar *, /* buffer for reading response */
414 int); /* sizeof buffer */
415 gstring * (*version_report)( /* diagnostic version reporting */
416 gstring *); /* string to append to */
417 void (*macros_create)(void); /* feature-macro creation */
421 /* Structure for holding a single IP address and port; used for the chain of
422 addresses and ports for the local host. Make the char string large enough to
423 hold an IPv6 address. */
425 typedef struct ip_address_item {
426 struct ip_address_item *next;
428 BOOL v6_include_v4; /* Used in the daemon */
430 uschar * log; /* portion of "listening on" log line */
433 /* Structure for chaining together arbitrary strings. */
435 typedef struct string_item {
436 struct string_item * next;
440 /* Information about a soft delivery failure, for use when calculating
441 retry information. It's separate from the address block, because there
442 can be a chain of them for SMTP deliveries where multiple IP addresses
445 typedef struct retry_item {
446 struct retry_item *next; /* for chaining */
447 const uschar *key; /* string identifying host/address/message */
448 int basic_errno; /* error code for this destination */
449 int more_errno; /* additional error information */
450 uschar *message; /* local error message */
451 int flags; /* see below */
454 /* Retry data flags */
456 #define rf_delete 0x0001 /* retry info is to be deleted */
457 #define rf_host 0x0002 /* retry info is for a remote host */
458 #define rf_message 0x0004 /* retry info is for a host+message */
460 /* Information about a constructed message that is to be sent using the
461 autoreply transport. This is pointed to from the address block. */
463 typedef struct reply_item {
464 uschar *from; /* ) */
465 uschar *reply_to; /* ) */
467 uschar *cc; /* ) specific header fields */
469 uschar *subject; /* ) */
470 uschar *headers; /* misc other headers, concatenated */
471 uschar *text; /* text string body */
472 uschar *file; /* file body */
473 BOOL file_expand; /* expand the body */
474 int expand_forbid; /* expansion lockout flags */
475 uschar *logfile; /* file to keep a log in */
476 uschar *oncelog; /* file to keep records in for once only */
477 time_t once_repeat; /* time to repeat "once only" */
478 BOOL return_message; /* send back the original message */
482 /* The address_item structure contains many fields which are used at various
483 times while delivering a message. Some are used only for remote deliveries;
484 some only for local. A particular set of fields is copied whenever a child
485 address is created. For convenience, we keep those fields in a separate
486 sub-structure so they can be copied in one go. This also means I won't forget
487 to edit the various copying places when new to-be-copied fields are added. */
489 typedef struct address_item_propagated {
490 uschar *address_data; /* arbitrary data to keep with the address */
491 uschar *domain_data; /* from "domains" lookup */
492 uschar *localpart_data; /* from "local_parts" lookup */
493 const uschar *errors_address; /* where to send errors (NULL => sender) */
494 header_line *extra_headers; /* additional headers */
495 uschar *remove_headers; /* list of those to remove */
496 void *variables; /* router-vasriables */
498 BOOL ignore_error:1; /* ignore delivery error */
500 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
501 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
502 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
504 } address_item_propagated;
507 /* The main address structure. Note that fields that are to be copied to
508 generated addresses should be put in the address_item_propagated structure (see
509 above) rather than directly into the address_item structure. */
511 typedef struct address_item {
512 struct address_item *next; /* for chaining addresses */
513 struct address_item *parent; /* parent address */
514 struct address_item *first; /* points to first after group delivery */
515 struct address_item *dupof; /* points to address this is a duplicate of */
517 router_instance *start_router; /* generated address starts here */
518 router_instance *router; /* the router that routed */
519 transport_instance *transport; /* the transport to use */
521 host_item *host_list; /* host data for the transport */
522 host_item *host_used; /* host that took delivery or failed hard */
523 host_item *fallback_hosts; /* to try if delivery defers */
525 reply_item *reply; /* data for autoreply */
526 retry_item *retries; /* chain of retry information */
528 const uschar *address; /* address being delivered or routed */
529 uschar *unique; /* used for disambiguating */
530 const uschar *cc_local_part; /* caseful local part */
531 const uschar *lc_local_part; /* lowercased local part */
532 const uschar *local_part; /* points to cc or lc version */
533 const uschar *prefix; /* stripped prefix of local part */
534 const uschar *prefix_v; /* variable part of above */
535 const uschar *suffix; /* stripped suffix of local part */
536 const uschar *suffix_v; /* variable part of above */
537 const uschar *domain; /* working domain (lower cased) */
539 uschar *address_retry_key; /* retry key including full address */
540 uschar *domain_retry_key; /* retry key for domain only */
542 uschar *current_dir; /* current directory for transporting */
543 uschar *home_dir; /* home directory for transporting */
544 uschar *message; /* error message */
545 uschar *user_message; /* error message that can be sent over SMTP
546 or quoted in bounce message */
547 const uschar *onetime_parent; /* saved original parent for onetime */
548 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
549 uschar *return_filename; /* name of return file */
550 uschar *self_hostname; /* after self=pass */
551 uschar *shadow_message; /* info about shadow transporting */
553 uid_t uid; /* uid for transporting */
554 gid_t gid; /* gid for transporting */
557 const uschar *tlsver; /* version used for transport */
558 uschar *cipher; /* Cipher used for transport */
559 void *ourcert; /* Certificate offered to peer, binary */
560 void *peercert; /* Certificate from peer, binary */
561 uschar *peerdn; /* DN of server's certificate */
562 int ocsp; /* OCSP status of peer cert */
565 #ifdef EXPERIMENTAL_DSN_INFO
566 const uschar *smtp_greeting; /* peer self-identification */
567 const uschar *helo_response; /* peer message */
570 uschar *authenticator; /* auth driver name used by transport */
571 uschar *auth_id; /* auth "login" name used by transport */
572 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
574 uschar *dsn_orcpt; /* DSN orcpt value */
575 int dsn_flags; /* DSN flags */
576 int dsn_aware; /* DSN aware flag */
579 const uschar * dkim_used; /* DKIM info, or NULL */
583 BOOL af_allow_file:1; /* allow file in generated address */
584 BOOL af_allow_pipe:1; /* allow pipe in generated address */
585 BOOL af_allow_reply:1; /* allow autoreply in generated address */
586 BOOL af_dr_retry_exists:1; /* router retry record exists */
587 BOOL af_expand_pipe:1; /* expand pipe arguments */
588 BOOL af_file:1; /* file delivery; always with pfr */
589 BOOL af_gid_set:1; /* gid field is set */
590 BOOL af_home_expanded:1; /* home_dir is already expanded */
591 BOOL af_initgroups:1; /* use initgroups() for local transporting */
592 BOOL af_local_host_removed:1; /* local host was backup */
593 BOOL af_lt_retry_exists:1; /* local transport retry exists */
594 BOOL af_pfr:1; /* pipe or file or reply delivery */
595 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
596 BOOL af_retry_timedout:1; /* true if retry timed out */
597 BOOL af_uid_set:1; /* uid field is set */
598 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
599 BOOL af_sverify_told:1; /* sender verify failure notified */
600 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
601 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
602 BOOL af_homonym:1; /* an ancestor has same address */
603 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
604 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
605 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
606 BOOL af_new_conn:1; /* delivered on an fresh TCP conn */
607 BOOL af_cont_conn:1; /* delivered (with new MAIL cmd) on an existing TCP conn */
608 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
609 BOOL af_pass_message:1; /* pass message in bounces */
610 BOOL af_bad_reply:1; /* filter could not generate autoreply */
611 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
612 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
613 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
614 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
615 #ifndef DISABLE_PIPE_CONNECT
616 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
619 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
621 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
622 BOOL af_force_command:1; /* force_command in pipe transport */
624 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
627 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
629 #ifndef DISABLE_TLS_RESUME
630 BOOL af_tls_resume:1; /* TLS used a resumed session */
634 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
635 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
636 int mode; /* mode for local transporting to a file */
637 int basic_errno; /* status after failure */
638 int more_errno; /* additional error information */
639 struct timeval delivery_time; /* time taken to do delivery/attempt */
641 unsigned short child_count; /* number of child addresses */
642 short int return_file; /* fileno of return data file */
643 short int special_action; /* ( used when when deferred or failed */
645 /* ( contains = or - when successful SMTP delivered */
647 /* ( contains verify rc in sender verify cache */
648 short int transport_return; /* result of delivery attempt */
649 address_item_propagated prop; /* fields that are propagated to children */
652 /* The table of header names consists of items of this type */
661 /* Chain of information about errors (e.g. bad addresses) */
663 typedef struct error_block {
664 struct error_block *next;
669 /* Chain of file names when processing the queue */
671 typedef struct queue_filename {
672 struct queue_filename *next;
677 /* Chain of items of retry information, read from the retry config. */
679 typedef struct retry_rule {
680 struct retry_rule *next;
687 typedef struct retry_config {
688 struct retry_config *next;
696 /* Structure for each node in a tree, of which there are various kinds */
698 typedef struct tree_node {
699 struct tree_node *left; /* pointer to left child */
700 struct tree_node *right; /* pointer to right child */
703 void *ptr; /* pointer to data */
704 int val; /* or integer data */
706 uschar balance; /* balancing factor */
707 uschar name[1]; /* node name - variable length */
710 /* Structure for holding time-limited data such as DNS returns.
711 We use this rather than extending tree_node to avoid wasting
712 space for most tree use (variables...) at the cost of complexity
713 for the lookups cache.
714 We also store any options used for the lookup. */
716 typedef struct expiring_data {
717 time_t expiry; /* if nonzero, data invalid after this time */
718 const uschar * opts; /* options, or NULL */
721 void * ptr; /* pointer to data */
722 int val; /* or integer data */
726 /* Structure for holding the handle and the cached last lookup for searches.
727 This block is pointed to by the tree entry for the file. The file can get
728 closed if too many are opened at once. There is a LRU chain for deciding which
731 typedef struct search_cache {
732 void *handle; /* lookup handle, or NULL if closed */
733 int search_type; /* search type */
734 tree_node *up; /* LRU up pointer */
735 tree_node *down; /* LRU down pointer */
736 tree_node *item_cache; /* tree of cached results */
739 /* Structure for holding a partially decoded DNS record; the name has been
740 uncompressed, but the data pointer is into the raw data. */
743 uschar name[DNS_MAXNAME]; /* domain name */
744 int type; /* record type */
745 unsigned short ttl; /* time-to-live, seconds */
746 int size; /* size of data */
747 const uschar *data; /* pointer to data */
750 /* Structure for holding the result of a DNS query. A touch over
751 64k big, so take care to release as soon as possible. */
754 int answerlen; /* length of the answer */
755 uschar answer[NS_MAXMSG]; /* the answer itself */
758 /* Structure for holding the intermediate data while scanning a DNS answer
762 int rrcount; /* count of RRs in the answer */
763 const uschar *aptr; /* pointer in the answer while scanning */
764 dns_record srr; /* data from current record in scan */
767 /* Structure for holding a chain of IP addresses that are extracted from
768 an A, AAAA, or A6 record. For the first two, there is only ever one address,
769 but the chaining feature of A6 allows for several addresses to be realized from
770 a single initial A6 record. The structure defines the address field of length
771 1. In use, a suitable sized block is obtained to hold the complete textual
774 typedef struct dns_address {
775 struct dns_address *next;
779 /* Structure used for holding intermediate data during MD5 computations. */
783 unsigned int abcd[4];
787 /* Structure used for holding intermediate data during SHA-1 computations. */
789 typedef struct sha1 {
794 /* Information for making an smtp connection */
796 transport_instance * tblock;
797 void * ob; /* smtp_transport_options_block * */
802 int sock; /* used for a bound but not connected socket */
803 uschar * sending_ip_address; /* used for TLS resumption */
804 const uschar * host_lbserver; /* ditto, for server-behind LB */
805 BOOL have_lbserver:1; /* host_lbserver is valid */
808 BOOL dane:1; /* connection must do dane */
809 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
813 /* A client-initiated connection. If TLS, the second element is non-NULL */
820 /* Structure used to hold incoming packets of SMTP responses for a specific
821 socket. The packets which may contain multiple lines (and in some cases,
822 multiple responses). */
824 typedef struct smtp_inblock {
825 client_conn_ctx * cctx; /* the connection */
826 int buffersize; /* the size of the buffer */
827 uschar *ptr; /* current position in the buffer */
828 uschar *ptrend; /* end of data in the buffer */
829 uschar *buffer; /* the buffer itself */
832 /* Structure used to hold buffered outgoing packets of SMTP commands for a
833 specific socket. The packets which may contain multiple lines when pipelining
836 typedef struct smtp_outblock {
837 client_conn_ctx * cctx; /* the connection */
838 int cmd_count; /* count of buffered commands */
839 int buffersize; /* the size of the buffer */
840 BOOL authenticating; /* TRUE when authenticating */
841 uschar *ptr; /* current position in the buffer */
842 uschar *buffer; /* the buffer itself */
844 smtp_connect_args * conn_args; /* to make connection, if not yet made */
847 /* Structure to hold information about the source of redirection information */
849 typedef struct redirect_block {
850 uschar *string; /* file name or string */
851 uid_t *owners; /* allowed file owners */
852 gid_t *owngroups; /* allowed file groups */
853 struct passwd *pw; /* possible owner if not NULL */
854 int modemask; /* forbidden bits */
855 BOOL isfile; /* TRUE if string is a file name */
856 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
857 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
860 /* Sieve control data */
862 typedef struct sieve_block {
863 const uschar * inbox;
864 const uschar * enotify_mailto_owner;
865 const uschar * subaddress;
866 const uschar * useraddress;
867 const uschar * vacation_dir;
870 /* Structure for passing arguments to check_host() */
872 typedef struct check_host_block {
873 const uschar *host_name;
874 const uschar *host_address;
875 const uschar *host_ipv4;
879 /* Structure for remembering lookup data when caching the result of
880 a lookup in a named list. */
882 typedef struct namedlist_cacheblock {
883 struct namedlist_cacheblock *next;
886 } namedlist_cacheblock;
888 /* Structure for holding data for an entry in a named list */
890 typedef struct namedlist_block {
891 const uschar *string; /* the list string */
892 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
893 short number; /* the number of the list for caching */
894 BOOL hide; /* -bP does not display value */
897 /* Structures for Access Control Lists */
899 typedef struct acl_condition_block {
900 struct acl_condition_block * next;
907 } acl_condition_block;
909 typedef struct acl_block {
910 struct acl_block * next;
911 acl_condition_block * condition;
914 const uschar * srcfile;
917 /* smtp transport calc outbound_ip */
918 typedef BOOL (*oicf) (uschar *message_id, void *data);
920 /* DKIM information for transport */
923 uschar *dkim_identity;
924 uschar *dkim_private_key;
925 uschar *dkim_selector;
927 uschar *dkim_sign_headers;
930 uschar *dkim_timestamps;
933 #ifdef EXPERIMENTAL_ARC
934 uschar *arc_signspec;
939 /* per-queue-runner info */
940 typedef struct qrunner {
941 struct qrunner * next; /* list sorted by next tick */
943 uschar * name; /* NULL for the default queue */
944 unsigned interval; /* tick rate, seconds. Zero for a one-time run */
945 time_t next_tick; /* next run should, or should have, start(ed) */
946 unsigned run_max; /* concurrent queue runner limit */
947 unsigned run_count; /* current runners */
949 BOOL queue_run_force :1;
950 BOOL deliver_force_thaw :1;
951 BOOL queue_run_first_delivery :1;
952 BOOL queue_run_local :1;
953 BOOL queue_2stage :1;
956 /* End of structs.h */