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 struct driver_info * next;
145 uschar *driver_name; /* Name of driver */
147 optionlist *options; /* Table of private options names */
148 int *options_count; /* -> Number of entries in table */
149 void *options_block; /* Points to default private block */
150 int options_len; /* Length of same in bytes */
151 void (*init)( /* Initialization entry point */
152 struct driver_instance *);
153 uint dyn_magic; /* Magic num if dynamic, else zero */
156 /* Values for dyn_magic. Encode types and api version. */
157 #define ROUTER_MAGIC 0x52544d31 /* RTM1 */
158 #define TRANSPORT_MAGIC 0x54504d31 /* TPM1 */
159 #define AUTH_MAGIC 0x65554d31 /* AUM1 */
162 /* Structure for holding information about the configured transports. Some
163 of the generally accessible options are set from the configuration file; others
164 are set by transport initialization, since they can only be set for certain
165 transports. They need to be generally accessible, however, as they are used by
166 the main transport code. */
168 typedef struct transport_instance {
169 driver_instance drinst;
171 int (*setup)( /* Setup entry point */
172 struct transport_instance *,
173 struct address_item *,
174 struct transport_feedback *, /* For passing back config data */
175 uid_t, /* The uid that will be used */
176 gid_t, /* The gid that will be used */
177 uschar **); /* For an error message */
178 /**************************************/
179 int batch_max; /* ) */
180 uschar *batch_id; /* ) */
181 uschar *home_dir; /* ) Used only for local transports */
182 uschar *current_dir; /* ) */
183 /**************************************/
184 uschar *expand_multi_domain; /* ) */
185 BOOL multi_domain; /* ) */
186 BOOL overrides_hosts; /* ) Used only for remote transports */
187 uschar *max_addresses; /* ) */
188 int connection_max_messages;/* ) */
189 /**************************************/
190 BOOL deliver_as_creator; /* Used only by pipe at present */
191 BOOL disable_logging; /* For very weird requirements */
192 BOOL initgroups; /* Initialize groups when setting uid */
193 BOOL uid_set; /* uid is set */
194 BOOL gid_set; /* gid is set */
197 uschar *expand_uid; /* Variable uid */
198 uschar *expand_gid; /* Variable gid */
199 uschar *warn_message; /* Used only by appendfile at present */
200 uschar *shadow; /* Name of shadow transport */
201 uschar *shadow_condition; /* Condition for running it */
202 uschar *filter_command; /* For on-the-fly-filtering */
203 uschar *add_headers; /* Add these headers */
204 uschar *remove_headers; /* Remove these headers */
205 uschar *return_path; /* Overriding (rewriting) return path */
206 uschar *debug_string; /* Debugging output */
207 uschar *max_parallel; /* Number of concurrent instances */
208 uschar *message_size_limit; /* Biggest message this transport handles */
209 uschar *headers_rewrite; /* Rules for rewriting headers */
210 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
211 int rewrite_existflags; /* Bits showing which headers are rewritten */
212 int filter_timeout; /* For transport filter timing */
213 BOOL body_only; /* Deliver only the body */
214 BOOL delivery_date_add; /* Add Delivery-Date header */
215 BOOL envelope_to_add; /* Add Envelope-To header */
216 BOOL headers_only; /* Deliver only the headers */
217 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
218 BOOL return_path_add; /* Add Return-Path header */
219 BOOL return_output; /* TRUE if output should always be returned */
220 BOOL return_fail_output; /* ditto, but only on failure */
221 BOOL log_output; /* Similarly for logging */
222 BOOL log_fail_output;
223 BOOL log_defer_output;
224 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
225 #ifndef DISABLE_EVENT
226 uschar *event_action; /* String to expand on notable events */
228 } transport_instance;
231 /* Structure for holding information about a type of transport. The first
232 element must be a struct driver_info, to match auths and routers. */
234 typedef struct transport_info {
237 BOOL (*code)( /* Main entry point */
238 transport_instance *,
239 struct address_item *);
240 void (*tidyup)( /* Tidyup function */
241 struct transport_instance *);
242 void (*closedown)( /* For closing down a passed channel */
243 struct transport_instance *);
244 BOOL local; /* TRUE for local transports */
248 /* smtp transport datachunk callback */
250 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
251 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
253 struct transport_context;
254 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
256 /* Structure for information about a delivery-in-progress */
258 typedef struct transport_context {
259 union { /* discriminated by option topt_output_string */
260 int fd; /* file descriptor to write message to */
261 gstring * msg; /* allocated string with written message */
263 transport_instance * tblock; /* transport */
264 struct address_item * addr;
265 uschar * check_string; /* string replacement */
266 uschar * escape_string;
267 int options; /* output processing topt_* */
269 /* items below only used with option topt_use_bdat */
270 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
281 /* Structure for holding information about the configured routers. */
283 typedef struct router_instance {
284 driver_instance drinst;
286 uschar *address_data; /* Arbitrary data */
287 #ifdef EXPERIMENTAL_BRIGHTMAIL
288 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
290 uschar *cannot_route_message; /* Used when routing fails */
291 uschar *condition; /* General condition */
292 uschar *current_directory; /* For use during delivery */
293 uschar *debug_string; /* Debugging output */
294 uschar *domains; /* Specific domains */
295 uschar *errors_to; /* Errors address */
296 uschar *expand_gid; /* Expanded gid string */
297 uschar *expand_uid; /* Expanded uid string */
298 uschar *expand_more; /* Expanded more string */
299 uschar *expand_unseen; /* Expanded unseen string */
300 uschar *extra_headers; /* Additional headers */
301 uschar *fallback_hosts; /* For remote transports (text list) */
302 uschar *home_directory; /* For use during delivery */
303 uschar *ignore_target_hosts; /* Target hosts to ignore */
304 uschar *local_parts; /* Specific local parts */
305 uschar *pass_router_name; /* Router for passed address */
306 uschar *prefix; /* Address prefix */
307 uschar *redirect_router_name; /* Router for generated address */
308 uschar *remove_headers; /* Removed headers */
309 uschar *require_files; /* File checks before router is run */
310 uschar *router_home_directory; /* For use while routing */
311 uschar *self; /* Text option for handling self reference */
312 uschar *senders; /* Specific senders */
313 uschar *suffix; /* Address suffix */
314 uschar *translate_ip_address; /* IP address translation fudgery */
315 uschar *transport_name; /* Transport name */
317 BOOL address_test; /* Use this router when testing addresses */
318 #ifdef EXPERIMENTAL_BRIGHTMAIL
319 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
320 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
321 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
323 BOOL expn; /* Use this router when processing EXPN */
324 BOOL caseful_local_part; /* TRUE => don't lowercase */
325 BOOL check_local_user; /* TRUE => check local user */
326 BOOL disable_logging; /* For very weird requirements */
327 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
328 BOOL fail_verify_sender; /* Fail verify if sender match this router */
329 BOOL gid_set; /* Flag to indicate gid is set */
330 BOOL initgroups; /* TRUE if initgroups is required */
331 BOOL log_as_local; /* TRUE logs as a local delivery */
332 BOOL more; /* If FALSE, do no more if this one fails */
333 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
334 BOOL prefix_optional; /* Just what it says */
335 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
336 BOOL retry_use_local_part; /* Just what it says */
337 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
338 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
339 uschar *set; /* Variable = value to set; list */
340 BOOL suffix_optional; /* As it says */
341 BOOL verify_only; /* Skip this router if not verifying */
342 BOOL verify_recipient; /* Use this router when verifying a recipient*/
343 BOOL verify_sender; /* Use this router when verifying a sender */
344 BOOL uid_set; /* Flag to indicate uid is set */
345 BOOL unseen; /* If TRUE carry on, even after success */
346 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
348 int self_code; /* Encoded version of "self" */
349 uid_t uid; /* Fixed uid value */
350 gid_t gid; /* Fixed gid value */
352 host_item *fallback_hostlist; /* For remote transport (block chain) */
353 transport_instance *transport; /* Transport block (when found) */
354 struct router_instance *pass_router; /* Actual router for passed address */
355 struct router_instance *redirect_router; /* Actual router for generated address */
357 dnssec_domains dnssec;
361 /* Structure for holding information about a type of router. The first element
362 must be a struct driver_info, to match auths and transports. */
364 typedef struct router_info {
367 int (*code)( /* Main entry point */
369 struct address_item *,
372 struct address_item **,
373 struct address_item **,
374 struct address_item **,
375 struct address_item **);
376 void (*tidyup)( /* Tidyup function */
377 struct router_instance *);
378 int ri_flags; /* Descriptive flags */
382 /* Structure for holding information about a lookup type. */
384 #include "lookupapi.h"
387 /* Structure for holding information about the configured authentication
390 typedef struct auth_instance {
391 driver_instance drinst;
393 uschar *advertise_condition; /* Are we going to advertise this?*/
394 uschar *client_condition; /* Should the client try this? */
395 uschar *public_name; /* Advertised name */
396 uschar *set_id; /* String to set when server as authenticated id */
397 uschar *set_client_id; /* String to set when client as client_authenticated id */
398 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
399 uschar *server_debug_string; /* Debugging output */
400 uschar *server_condition; /* Authorization condition */
401 BOOL client; /* TRUE if client option(s) set */
402 BOOL server; /* TRUE if server options(s) set */
403 BOOL advertised; /* Set TRUE when advertised */
407 /* Structure for holding information about an authentication mechanism. The
408 first element must be a struct driver_info, to match routers and transports. */
410 typedef struct auth_info {
413 int (*servercode)( /* server function */
414 auth_instance *, /* the instance data */
415 uschar *); /* rest of AUTH command */
416 int (*clientcode)( /* client function */
417 struct auth_instance *,
418 void *, /* smtp conn, with socket, output and input buffers */
419 int, /* command timeout */
420 uschar *, /* buffer for reading response */
421 int); /* sizeof buffer */
422 gstring * (*version_report)( /* diagnostic version reporting */
423 gstring *); /* string to append to */
424 void (*macros_create)(void); /* feature-macro creation */
428 /* Structure for holding a single IP address and port; used for the chain of
429 addresses and ports for the local host. Make the char string large enough to
430 hold an IPv6 address. */
432 typedef struct ip_address_item {
433 struct ip_address_item *next;
435 BOOL v6_include_v4; /* Used in the daemon */
437 uschar * log; /* portion of "listening on" log line */
440 /* Structure for chaining together arbitrary strings. */
442 typedef struct string_item {
443 struct string_item * next;
447 /* Information about a soft delivery failure, for use when calculating
448 retry information. It's separate from the address block, because there
449 can be a chain of them for SMTP deliveries where multiple IP addresses
452 typedef struct retry_item {
453 struct retry_item *next; /* for chaining */
454 const uschar *key; /* string identifying host/address/message */
455 int basic_errno; /* error code for this destination */
456 int more_errno; /* additional error information */
457 uschar *message; /* local error message */
458 int flags; /* see below */
461 /* Retry data flags */
463 #define rf_delete 0x0001 /* retry info is to be deleted */
464 #define rf_host 0x0002 /* retry info is for a remote host */
465 #define rf_message 0x0004 /* retry info is for a host+message */
467 /* Information about a constructed message that is to be sent using the
468 autoreply transport. This is pointed to from the address block. */
470 typedef struct reply_item {
471 uschar *from; /* ) */
472 uschar *reply_to; /* ) */
474 uschar *cc; /* ) specific header fields */
476 uschar *subject; /* ) */
477 uschar *headers; /* misc other headers, concatenated */
478 uschar *text; /* text string body */
479 uschar *file; /* file body */
480 BOOL file_expand; /* expand the body */
481 int expand_forbid; /* expansion lockout flags */
482 uschar *logfile; /* file to keep a log in */
483 uschar *oncelog; /* file to keep records in for once only */
484 time_t once_repeat; /* time to repeat "once only" */
485 BOOL return_message; /* send back the original message */
489 /* The address_item structure contains many fields which are used at various
490 times while delivering a message. Some are used only for remote deliveries;
491 some only for local. A particular set of fields is copied whenever a child
492 address is created. For convenience, we keep those fields in a separate
493 sub-structure so they can be copied in one go. This also means I won't forget
494 to edit the various copying places when new to-be-copied fields are added. */
496 typedef struct address_item_propagated {
497 uschar *address_data; /* arbitrary data to keep with the address */
498 uschar *domain_data; /* from "domains" lookup */
499 uschar *localpart_data; /* from "local_parts" lookup */
500 const uschar *errors_address; /* where to send errors (NULL => sender) */
501 header_line *extra_headers; /* additional headers */
502 uschar *remove_headers; /* list of those to remove */
503 void *variables; /* router-vasriables */
505 BOOL ignore_error:1; /* ignore delivery error */
507 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
508 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
509 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
511 } address_item_propagated;
514 /* The main address structure. Note that fields that are to be copied to
515 generated addresses should be put in the address_item_propagated structure (see
516 above) rather than directly into the address_item structure. */
518 typedef struct address_item {
519 struct address_item *next; /* for chaining addresses */
520 struct address_item *parent; /* parent address */
521 struct address_item *first; /* points to first after group delivery */
522 struct address_item *dupof; /* points to address this is a duplicate of */
524 router_instance *start_router; /* generated address starts here */
525 router_instance *router; /* the router that routed */
526 transport_instance *transport; /* the transport to use */
528 host_item *host_list; /* host data for the transport */
529 host_item *host_used; /* host that took delivery or failed hard */
530 host_item *fallback_hosts; /* to try if delivery defers */
532 reply_item *reply; /* data for autoreply */
533 retry_item *retries; /* chain of retry information */
535 const uschar *address; /* address being delivered or routed */
536 uschar *unique; /* used for disambiguating */
537 const uschar *cc_local_part; /* caseful local part */
538 const uschar *lc_local_part; /* lowercased local part */
539 const uschar *local_part; /* points to cc or lc version */
540 const uschar *prefix; /* stripped prefix of local part */
541 const uschar *prefix_v; /* variable part of above */
542 const uschar *suffix; /* stripped suffix of local part */
543 const uschar *suffix_v; /* variable part of above */
544 const uschar *domain; /* working domain (lower cased) */
546 uschar *address_retry_key; /* retry key including full address */
547 uschar *domain_retry_key; /* retry key for domain only */
549 uschar *current_dir; /* current directory for transporting */
550 uschar *home_dir; /* home directory for transporting */
551 uschar *message; /* error message */
552 uschar *user_message; /* error message that can be sent over SMTP
553 or quoted in bounce message */
554 const uschar *onetime_parent; /* saved original parent for onetime */
555 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
556 uschar *return_filename; /* name of return file */
557 uschar *self_hostname; /* after self=pass */
558 uschar *shadow_message; /* info about shadow transporting */
560 uid_t uid; /* uid for transporting */
561 gid_t gid; /* gid for transporting */
564 const uschar *tlsver; /* version used for transport */
565 uschar *cipher; /* Cipher used for transport */
566 void *ourcert; /* Certificate offered to peer, binary */
567 void *peercert; /* Certificate from peer, binary */
568 uschar *peerdn; /* DN of server's certificate */
569 int ocsp; /* OCSP status of peer cert */
572 #ifdef EXPERIMENTAL_DSN_INFO
573 const uschar *smtp_greeting; /* peer self-identification */
574 const uschar *helo_response; /* peer message */
577 uschar *authenticator; /* auth driver name used by transport */
578 uschar *auth_id; /* auth "login" name used by transport */
579 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
581 uschar *dsn_orcpt; /* DSN orcpt value */
582 int dsn_flags; /* DSN flags */
583 int dsn_aware; /* DSN aware flag */
586 const uschar * dkim_used; /* DKIM info, or NULL */
590 BOOL af_allow_file:1; /* allow file in generated address */
591 BOOL af_allow_pipe:1; /* allow pipe in generated address */
592 BOOL af_allow_reply:1; /* allow autoreply in generated address */
593 BOOL af_dr_retry_exists:1; /* router retry record exists */
594 BOOL af_expand_pipe:1; /* expand pipe arguments */
595 BOOL af_file:1; /* file delivery; always with pfr */
596 BOOL af_gid_set:1; /* gid field is set */
597 BOOL af_home_expanded:1; /* home_dir is already expanded */
598 BOOL af_initgroups:1; /* use initgroups() for local transporting */
599 BOOL af_local_host_removed:1; /* local host was backup */
600 BOOL af_lt_retry_exists:1; /* local transport retry exists */
601 BOOL af_pfr:1; /* pipe or file or reply delivery */
602 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
603 BOOL af_retry_timedout:1; /* true if retry timed out */
604 BOOL af_uid_set:1; /* uid field is set */
605 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
606 BOOL af_sverify_told:1; /* sender verify failure notified */
607 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
608 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
609 BOOL af_homonym:1; /* an ancestor has same address */
610 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
611 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
612 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
613 BOOL af_new_conn:1; /* delivered on an fresh TCP conn */
614 BOOL af_cont_conn:1; /* delivered (with new MAIL cmd) on an existing TCP conn */
615 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
616 BOOL af_pass_message:1; /* pass message in bounces */
617 BOOL af_bad_reply:1; /* filter could not generate autoreply */
618 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
619 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
620 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
621 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
622 #ifndef DISABLE_PIPE_CONNECT
623 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
626 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
628 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
629 BOOL af_force_command:1; /* force_command in pipe transport */
631 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
634 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
636 #ifndef DISABLE_TLS_RESUME
637 BOOL af_tls_resume:1; /* TLS used a resumed session */
641 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
642 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
643 int mode; /* mode for local transporting to a file */
644 int basic_errno; /* status after failure */
645 int more_errno; /* additional error information */
646 struct timeval delivery_time; /* time taken to do delivery/attempt */
648 unsigned short child_count; /* number of child addresses */
649 short int return_file; /* fileno of return data file */
650 short int special_action; /* ( used when when deferred or failed */
652 /* ( contains = or - when successful SMTP delivered */
654 /* ( contains verify rc in sender verify cache */
655 short int transport_return; /* result of delivery attempt */
656 address_item_propagated prop; /* fields that are propagated to children */
659 /* The table of header names consists of items of this type */
668 /* Chain of information about errors (e.g. bad addresses) */
670 typedef struct error_block {
671 struct error_block *next;
676 /* Chain of file names when processing the queue */
678 typedef struct queue_filename {
679 struct queue_filename *next;
684 /* Chain of items of retry information, read from the retry config. */
686 typedef struct retry_rule {
687 struct retry_rule *next;
694 typedef struct retry_config {
695 struct retry_config *next;
703 /* Structure for each node in a tree, of which there are various kinds */
705 typedef struct tree_node {
706 struct tree_node *left; /* pointer to left child */
707 struct tree_node *right; /* pointer to right child */
710 void *ptr; /* pointer to data */
711 int val; /* or integer data */
713 uschar balance; /* balancing factor */
714 uschar name[1]; /* node name - variable length */
717 /* Structure for holding time-limited data such as DNS returns.
718 We use this rather than extending tree_node to avoid wasting
719 space for most tree use (variables...) at the cost of complexity
720 for the lookups cache.
721 We also store any options used for the lookup. */
723 typedef struct expiring_data {
724 time_t expiry; /* if nonzero, data invalid after this time */
725 const uschar * opts; /* options, or NULL */
728 void * ptr; /* pointer to data */
729 int val; /* or integer data */
733 /* Structure for holding the handle and the cached last lookup for searches.
734 This block is pointed to by the tree entry for the file. The file can get
735 closed if too many are opened at once. There is a LRU chain for deciding which
738 typedef struct search_cache {
739 void *handle; /* lookup handle, or NULL if closed */
740 int search_type; /* search type */
741 tree_node *up; /* LRU up pointer */
742 tree_node *down; /* LRU down pointer */
743 tree_node *item_cache; /* tree of cached results */
746 /* Structure for holding a partially decoded DNS record; the name has been
747 uncompressed, but the data pointer is into the raw data. */
750 uschar name[DNS_MAXNAME]; /* domain name */
751 int type; /* record type */
752 unsigned short ttl; /* time-to-live, seconds */
753 int size; /* size of data */
754 const uschar *data; /* pointer to data */
757 /* Structure for holding the result of a DNS query. A touch over
758 64k big, so take care to release as soon as possible. */
761 int answerlen; /* length of the answer */
762 uschar answer[NS_MAXMSG]; /* the answer itself */
765 /* Structure for holding the intermediate data while scanning a DNS answer
769 int rrcount; /* count of RRs in the answer */
770 const uschar *aptr; /* pointer in the answer while scanning */
771 dns_record srr; /* data from current record in scan */
774 /* Structure for holding a chain of IP addresses that are extracted from
775 an A, AAAA, or A6 record. For the first two, there is only ever one address,
776 but the chaining feature of A6 allows for several addresses to be realized from
777 a single initial A6 record. The structure defines the address field of length
778 1. In use, a suitable sized block is obtained to hold the complete textual
781 typedef struct dns_address {
782 struct dns_address *next;
786 /* Structure used for holding intermediate data during MD5 computations. */
790 unsigned int abcd[4];
794 /* Structure used for holding intermediate data during SHA-1 computations. */
796 typedef struct sha1 {
801 /* Information for making an smtp connection */
803 transport_instance * tblock;
804 void * ob; /* smtp_transport_options_block * */
809 int sock; /* used for a bound but not connected socket */
810 uschar * sending_ip_address; /* used for TLS resumption */
811 const uschar * host_lbserver; /* ditto, for server-behind LB */
812 BOOL have_lbserver:1; /* host_lbserver is valid */
815 BOOL dane:1; /* connection must do dane */
816 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
820 /* A client-initiated connection. If TLS, the second element is non-NULL */
827 /* Structure used to hold incoming packets of SMTP responses for a specific
828 socket. The packets which may contain multiple lines (and in some cases,
829 multiple responses). */
831 typedef struct smtp_inblock {
832 client_conn_ctx * cctx; /* the connection */
833 int buffersize; /* the size of the buffer */
834 uschar *ptr; /* current position in the buffer */
835 uschar *ptrend; /* end of data in the buffer */
836 uschar *buffer; /* the buffer itself */
839 /* Structure used to hold buffered outgoing packets of SMTP commands for a
840 specific socket. The packets which may contain multiple lines when pipelining
843 typedef struct smtp_outblock {
844 client_conn_ctx * cctx; /* the connection */
845 int cmd_count; /* count of buffered commands */
846 int buffersize; /* the size of the buffer */
847 BOOL authenticating; /* TRUE when authenticating */
848 uschar *ptr; /* current position in the buffer */
849 uschar *buffer; /* the buffer itself */
851 smtp_connect_args * conn_args; /* to make connection, if not yet made */
854 /* Structure to hold information about the source of redirection information */
856 typedef struct redirect_block {
857 uschar *string; /* file name or string */
858 uid_t *owners; /* allowed file owners */
859 gid_t *owngroups; /* allowed file groups */
860 struct passwd *pw; /* possible owner if not NULL */
861 int modemask; /* forbidden bits */
862 BOOL isfile; /* TRUE if string is a file name */
863 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
864 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
867 /* Sieve control data */
869 typedef struct sieve_block {
870 const uschar * inbox;
871 const uschar * enotify_mailto_owner;
872 const uschar * subaddress;
873 const uschar * useraddress;
874 const uschar * vacation_dir;
877 /* Structure for passing arguments to check_host() */
879 typedef struct check_host_block {
880 const uschar *host_name;
881 const uschar *host_address;
882 const uschar *host_ipv4;
886 /* Structure for remembering lookup data when caching the result of
887 a lookup in a named list. */
889 typedef struct namedlist_cacheblock {
890 struct namedlist_cacheblock *next;
893 } namedlist_cacheblock;
895 /* Structure for holding data for an entry in a named list */
897 typedef struct namedlist_block {
898 const uschar *string; /* the list string */
899 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
900 short number; /* the number of the list for caching */
901 BOOL hide; /* -bP does not display value */
904 /* Structures for Access Control Lists */
906 typedef struct acl_condition_block {
907 struct acl_condition_block * next;
914 } acl_condition_block;
916 typedef struct acl_block {
917 struct acl_block * next;
918 acl_condition_block * condition;
921 const uschar * srcfile;
924 /* smtp transport calc outbound_ip */
925 typedef BOOL (*oicf) (uschar *message_id, void *data);
927 /* DKIM information for transport */
930 uschar *dkim_identity;
931 uschar *dkim_private_key;
932 uschar *dkim_selector;
934 uschar *dkim_sign_headers;
937 uschar *dkim_timestamps;
940 #ifdef EXPERIMENTAL_ARC
941 uschar *arc_signspec;
946 /* per-queue-runner info */
947 typedef struct qrunner {
948 struct qrunner * next; /* list sorted by next tick */
950 uschar * name; /* NULL for the default queue */
951 unsigned interval; /* tick rate, seconds. Zero for a one-time run */
952 time_t next_tick; /* next run should, or should have, start(ed) */
953 unsigned run_max; /* concurrent queue runner limit */
954 unsigned run_count; /* current runners */
956 BOOL queue_run_force :1;
957 BOOL deliver_force_thaw :1;
958 BOOL queue_run_first_delivery :1;
959 BOOL queue_run_local :1;
960 BOOL queue_2stage :1;
963 /* End of structs.h */