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 */
13 /* Definitions of various structures. In addition, those that are visible for
14 the compilation of local_scan() are defined in local_scan.h. These are
20 For those declared here, we have to pre-declare some because of mutually
21 recursive definitions in the auths, routers, and transports blocks. */
29 struct transport_info;
33 typedef struct gstring {
34 int size; /* Current capacity of string memory */
35 int ptr; /* Offset at which to append further chars */
36 uschar * s; /* The string memory */
39 /* Structure for remembering macros for the configuration file */
41 typedef struct macro_item {
42 struct macro_item * next;
47 const uschar * replacement;
50 /* Structure for bit tables for debugging and logging */
52 typedef struct bit_table {
57 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
59 typedef struct ugid_block {
67 typedef enum { CHUNKING_NOT_OFFERED = -1,
70 CHUNKING_LAST} chunking_state_t;
72 typedef enum { TFO_NOT_USED = 0,
76 TFO_USED_DATA } tfo_state_t;
78 /* Structure for holding information about a host for use mainly by routers,
79 but also used when checking lists of hosts and when transporting. Looking up
80 host addresses is done using this structure. */
82 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
84 typedef struct host_item {
85 struct host_item *next;
86 const uschar *name; /* Host name */
88 const uschar *certname; /* Name used for certificate checks */
90 const uschar *address; /* IP address in text form */
91 int port; /* port value in host order (if SRV lookup) */
92 int mx; /* MX value if found via MX records */
93 int sort_key; /* MX*1000 plus random "fraction" */
94 int status; /* Usable, unusable, or unknown */
95 int why; /* Why host is unusable */
96 int last_try; /* Time of last try if known */
97 dnssec_status_t dnssec;
100 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
101 rewrite_headers field of a transport. */
103 typedef struct rewrite_rule {
104 struct rewrite_rule *next;
110 /* This structure is used to pass back configuration data from the smtp
111 transport to the outside world. It is used during callback processing. If ever
112 another remote transport were implemented, it could use the same structure. */
114 typedef struct transport_feedback {
121 BOOL hosts_randomize;
125 } transport_feedback;
127 /* Routers, transports, and authenticators have similar data blocks. Each
128 driver that is compiled into the code is represented by a xxx_info block; the
129 active drivers are represented by a chain of xxx_instance blocks. To make it
130 possible to use the same code for reading the configuration files for all
131 three, the layout of the start of the blocks is kept the same, and represented
132 by the generic structures driver_info and driver_instance. */
134 typedef struct driver_instance {
136 uschar *name; /* Instance name */
137 void *info; /* Points to info for this driver */
138 void *options_block; /* Pointer to private options */
140 uschar *driver_name; /* All start with this generic option */
141 const uschar *srcfile; /* and config source info for errors */
145 typedef struct driver_info {
146 struct driver_info * next;
147 uschar *driver_name; /* Name of driver */
149 optionlist *options; /* Table of private options names */
150 int *options_count; /* -> Number of entries in table */
151 void *options_block; /* Points to default private block */
152 int options_len; /* Length of same in bytes */
153 void (*init)( /* Initialization entry point */
154 struct driver_instance *);
155 uint dyn_magic; /* Magic num if dynamic, else zero */
158 /* Values for dyn_magic. Encode types and api version. */
159 #define ROUTER_MAGIC 0x52544d31 /* RTM1 */
160 #define TRANSPORT_MAGIC 0x54504d31 /* TPM1 */
161 #define AUTH_MAGIC 0x65554d31 /* AUM1 */
169 /* Structure for holding information about the configured transports. Some
170 of the generally accessible options are set from the configuration file; others
171 are set by transport initialization, since they can only be set for certain
172 transports. They need to be generally accessible, however, as they are used by
173 the main transport code. */
175 typedef struct transport_instance {
176 driver_instance drinst;
178 int (*setup)( /* Setup entry point */
179 struct transport_instance *,
180 struct address_item *,
181 struct transport_feedback *, /* For passing back config data */
182 uid_t, /* The uid that will be used */
183 gid_t, /* The gid that will be used */
184 uschar **); /* For an error message */
185 /**************************************/
186 int batch_max; /* ) */
187 uschar *batch_id; /* ) */
188 uschar *home_dir; /* ) Used only for local transports */
189 uschar *current_dir; /* ) */
190 /**************************************/
191 uschar *expand_multi_domain; /* ) */
192 BOOL multi_domain; /* ) */
193 BOOL overrides_hosts; /* ) Used only for remote transports */
194 uschar *max_addresses; /* ) */
195 int connection_max_messages;/* ) */
196 /**************************************/
197 BOOL deliver_as_creator; /* Used only by pipe at present */
198 BOOL disable_logging; /* For very weird requirements */
199 BOOL initgroups; /* Initialize groups when setting uid */
200 BOOL uid_set; /* uid is set */
201 BOOL gid_set; /* gid is set */
204 uschar *expand_uid; /* Variable uid */
205 uschar *expand_gid; /* Variable gid */
206 uschar *warn_message; /* Used only by appendfile at present */
207 uschar *shadow; /* Name of shadow transport */
208 uschar *shadow_condition; /* Condition for running it */
209 uschar *filter_command; /* For on-the-fly-filtering */
210 uschar *add_headers; /* Add these headers */
211 uschar *remove_headers; /* Remove these headers */
212 uschar *return_path; /* Overriding (rewriting) return path */
213 uschar *debug_string; /* Debugging output */
214 uschar *max_parallel; /* Number of concurrent instances */
215 uschar *message_size_limit; /* Biggest message this transport handles */
216 uschar *headers_rewrite; /* Rules for rewriting headers */
217 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
218 int rewrite_existflags; /* Bits showing which headers are rewritten */
219 int filter_timeout; /* For transport filter timing */
220 BOOL body_only; /* Deliver only the body */
221 BOOL delivery_date_add; /* Add Delivery-Date header */
222 BOOL envelope_to_add; /* Add Envelope-To header */
223 BOOL headers_only; /* Deliver only the headers */
224 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
225 BOOL return_path_add; /* Add Return-Path header */
226 BOOL return_output; /* TRUE if output should always be returned */
227 BOOL return_fail_output; /* ditto, but only on failure */
228 BOOL log_output; /* Similarly for logging */
229 BOOL log_fail_output;
230 BOOL log_defer_output;
231 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
232 #ifndef DISABLE_EVENT
233 uschar *event_action; /* String to expand on notable events */
235 } transport_instance;
238 /* Structure for holding information about a type of transport. The first
239 element must be a struct driver_info, to match auths and routers. */
241 typedef struct transport_info {
244 BOOL (*code)( /* Main entry point */
245 transport_instance *,
246 struct address_item *);
247 void (*tidyup)( /* Tidyup function */
248 struct transport_instance *);
249 void (*closedown)( /* For closing down a passed channel */
250 struct transport_instance *);
251 BOOL local; /* TRUE for local transports */
255 /* smtp transport datachunk callback */
257 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
258 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
260 struct transport_context;
261 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
263 /* Structure for information about a delivery-in-progress */
265 typedef struct transport_context {
266 union { /* discriminated by option topt_output_string */
267 int fd; /* file descriptor to write message to */
268 gstring * msg; /* allocated string with written message */
270 transport_instance * tblock; /* transport */
271 struct address_item * addr;
272 uschar * check_string; /* string replacement */
273 uschar * escape_string;
274 int options; /* output processing topt_* */
276 /* items below only used with option topt_use_bdat */
277 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
288 /* Structure for holding information about the configured routers. */
290 typedef struct router_instance {
291 driver_instance drinst;
293 uschar *address_data; /* Arbitrary data */
294 #ifdef EXPERIMENTAL_BRIGHTMAIL
295 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
297 uschar *cannot_route_message; /* Used when routing fails */
298 uschar *condition; /* General condition */
299 uschar *current_directory; /* For use during delivery */
300 uschar *debug_string; /* Debugging output */
301 uschar *domains; /* Specific domains */
302 uschar *errors_to; /* Errors address */
303 uschar *expand_gid; /* Expanded gid string */
304 uschar *expand_uid; /* Expanded uid string */
305 uschar *expand_more; /* Expanded more string */
306 uschar *expand_unseen; /* Expanded unseen string */
307 uschar *extra_headers; /* Additional headers */
308 uschar *fallback_hosts; /* For remote transports (text list) */
309 uschar *home_directory; /* For use during delivery */
310 uschar *ignore_target_hosts; /* Target hosts to ignore */
311 uschar *local_parts; /* Specific local parts */
312 uschar *pass_router_name; /* Router for passed address */
313 uschar *prefix; /* Address prefix */
314 uschar *redirect_router_name; /* Router for generated address */
315 uschar *remove_headers; /* Removed headers */
316 uschar *require_files; /* File checks before router is run */
317 uschar *router_home_directory; /* For use while routing */
318 uschar *self; /* Text option for handling self reference */
319 uschar *senders; /* Specific senders */
320 uschar *suffix; /* Address suffix */
321 uschar *translate_ip_address; /* IP address translation fudgery */
322 uschar *transport_name; /* Transport name */
324 BOOL address_test; /* Use this router when testing addresses */
325 #ifdef EXPERIMENTAL_BRIGHTMAIL
326 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
327 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
328 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
330 BOOL expn; /* Use this router when processing EXPN */
331 BOOL caseful_local_part; /* TRUE => don't lowercase */
332 BOOL check_local_user; /* TRUE => check local user */
333 BOOL disable_logging; /* For very weird requirements */
334 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
335 BOOL fail_verify_sender; /* Fail verify if sender match this router */
336 BOOL gid_set; /* Flag to indicate gid is set */
337 BOOL initgroups; /* TRUE if initgroups is required */
338 BOOL log_as_local; /* TRUE logs as a local delivery */
339 BOOL more; /* If FALSE, do no more if this one fails */
340 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
341 BOOL prefix_optional; /* Just what it says */
342 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
343 BOOL retry_use_local_part; /* Just what it says */
344 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
345 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
346 uschar *set; /* Variable = value to set; list */
347 BOOL suffix_optional; /* As it says */
348 BOOL verify_only; /* Skip this router if not verifying */
349 BOOL verify_recipient; /* Use this router when verifying a recipient*/
350 BOOL verify_sender; /* Use this router when verifying a sender */
351 BOOL uid_set; /* Flag to indicate uid is set */
352 BOOL unseen; /* If TRUE carry on, even after success */
353 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
355 int self_code; /* Encoded version of "self" */
356 uid_t uid; /* Fixed uid value */
357 gid_t gid; /* Fixed gid value */
359 host_item *fallback_hostlist; /* For remote transport (block chain) */
360 transport_instance *transport; /* Transport block (when found) */
361 struct router_instance *pass_router; /* Actual router for passed address */
362 struct router_instance *redirect_router; /* Actual router for generated address */
364 dnssec_domains dnssec;
368 /* Structure for holding information about a type of router. The first element
369 must be a struct driver_info, to match auths and transports. */
371 typedef struct router_info {
374 int (*code)( /* Main entry point */
376 struct address_item *,
379 struct address_item **,
380 struct address_item **,
381 struct address_item **,
382 struct address_item **);
383 void (*tidyup)( /* Tidyup function */
384 struct router_instance *);
385 int ri_flags; /* Descriptive flags */
389 /* Structure for holding information about a lookup type. */
391 #include "lookupapi.h"
394 /* Structure for holding information about the configured authentication
397 typedef struct auth_instance {
398 driver_instance drinst;
400 uschar *advertise_condition; /* Are we going to advertise this?*/
401 uschar *client_condition; /* Should the client try this? */
402 uschar *public_name; /* Advertised name */
403 uschar *set_id; /* String to set when server as authenticated id */
404 uschar *set_client_id; /* String to set when client as client_authenticated id */
405 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
406 uschar *server_debug_string; /* Debugging output */
407 uschar *server_condition; /* Authorization condition */
408 BOOL client; /* TRUE if client option(s) set */
409 BOOL server; /* TRUE if server options(s) set */
410 BOOL advertised; /* Set TRUE when advertised */
414 /* Structure for holding information about an authentication mechanism. The
415 first element must be a struct driver_info, to match routers and transports. */
417 typedef struct auth_info {
420 int (*servercode)( /* server function */
421 auth_instance *, /* the instance data */
422 uschar *); /* rest of AUTH command */
423 int (*clientcode)( /* client function */
424 struct auth_instance *,
425 void *, /* smtp conn, with socket, output and input buffers */
426 int, /* command timeout */
427 uschar *, /* buffer for reading response */
428 int); /* sizeof buffer */
429 gstring * (*version_report)( /* diagnostic version reporting */
430 gstring *); /* string to append to */
431 void (*macros_create)(void); /* feature-macro creation */
435 /* Structure for holding a single IP address and port; used for the chain of
436 addresses and ports for the local host. Make the char string large enough to
437 hold an IPv6 address. */
439 typedef struct ip_address_item {
440 struct ip_address_item *next;
442 BOOL v6_include_v4; /* Used in the daemon */
444 uschar * log; /* portion of "listening on" log line */
447 /* Structure for chaining together arbitrary strings. */
449 typedef struct string_item {
450 struct string_item * next;
454 /* Information about a soft delivery failure, for use when calculating
455 retry information. It's separate from the address block, because there
456 can be a chain of them for SMTP deliveries where multiple IP addresses
459 typedef struct retry_item {
460 struct retry_item *next; /* for chaining */
461 const uschar *key; /* string identifying host/address/message */
462 int basic_errno; /* error code for this destination */
463 int more_errno; /* additional error information */
464 uschar *message; /* local error message */
465 int flags; /* see below */
468 /* Retry data flags */
470 #define rf_delete 0x0001 /* retry info is to be deleted */
471 #define rf_host 0x0002 /* retry info is for a remote host */
472 #define rf_message 0x0004 /* retry info is for a host+message */
474 /* Information about a constructed message that is to be sent using the
475 autoreply transport. This is pointed to from the address block. */
477 typedef struct reply_item {
478 uschar *from; /* ) */
479 uschar *reply_to; /* ) */
481 uschar *cc; /* ) specific header fields */
483 uschar *subject; /* ) */
484 uschar *headers; /* misc other headers, concatenated */
485 uschar *text; /* text string body */
486 uschar *file; /* file body */
487 BOOL file_expand; /* expand the body */
488 int expand_forbid; /* expansion lockout flags */
489 uschar *logfile; /* file to keep a log in */
490 uschar *oncelog; /* file to keep records in for once only */
491 time_t once_repeat; /* time to repeat "once only" */
492 BOOL return_message; /* send back the original message */
496 /* The address_item structure contains many fields which are used at various
497 times while delivering a message. Some are used only for remote deliveries;
498 some only for local. A particular set of fields is copied whenever a child
499 address is created. For convenience, we keep those fields in a separate
500 sub-structure so they can be copied in one go. This also means I won't forget
501 to edit the various copying places when new to-be-copied fields are added. */
503 typedef struct address_item_propagated {
504 uschar *address_data; /* arbitrary data to keep with the address */
505 uschar *domain_data; /* from "domains" lookup */
506 uschar *localpart_data; /* from "local_parts" lookup */
507 const uschar *errors_address; /* where to send errors (NULL => sender) */
508 header_line *extra_headers; /* additional headers */
509 uschar *remove_headers; /* list of those to remove */
510 void *variables; /* router-vasriables */
512 BOOL ignore_error:1; /* ignore delivery error */
514 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
515 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
516 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
518 } address_item_propagated;
521 /* The main address structure. Note that fields that are to be copied to
522 generated addresses should be put in the address_item_propagated structure (see
523 above) rather than directly into the address_item structure. */
525 typedef struct address_item {
526 struct address_item *next; /* for chaining addresses */
527 struct address_item *parent; /* parent address */
528 struct address_item *first; /* points to first after group delivery */
529 struct address_item *dupof; /* points to address this is a duplicate of */
531 router_instance *start_router; /* generated address starts here */
532 router_instance *router; /* the router that routed */
533 transport_instance *transport; /* the transport to use */
535 host_item *host_list; /* host data for the transport */
536 host_item *host_used; /* host that took delivery or failed hard */
537 host_item *fallback_hosts; /* to try if delivery defers */
539 reply_item *reply; /* data for autoreply */
540 retry_item *retries; /* chain of retry information */
542 const uschar *address; /* address being delivered or routed */
543 uschar *unique; /* used for disambiguating */
544 const uschar *cc_local_part; /* caseful local part */
545 const uschar *lc_local_part; /* lowercased local part */
546 const uschar *local_part; /* points to cc or lc version */
547 const uschar *prefix; /* stripped prefix of local part */
548 const uschar *prefix_v; /* variable part of above */
549 const uschar *suffix; /* stripped suffix of local part */
550 const uschar *suffix_v; /* variable part of above */
551 const uschar *domain; /* working domain (lower cased) */
553 uschar *address_retry_key; /* retry key including full address */
554 uschar *domain_retry_key; /* retry key for domain only */
556 uschar *current_dir; /* current directory for transporting */
557 uschar *home_dir; /* home directory for transporting */
558 uschar *message; /* error message */
559 uschar *user_message; /* error message that can be sent over SMTP
560 or quoted in bounce message */
561 const uschar *onetime_parent; /* saved original parent for onetime */
562 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
563 uschar *return_filename; /* name of return file */
564 uschar *self_hostname; /* after self=pass */
565 uschar *shadow_message; /* info about shadow transporting */
567 uid_t uid; /* uid for transporting */
568 gid_t gid; /* gid for transporting */
571 const uschar *tlsver; /* version used for transport */
572 uschar *cipher; /* Cipher used for transport */
573 void *ourcert; /* Certificate offered to peer, binary */
574 void *peercert; /* Certificate from peer, binary */
575 uschar *peerdn; /* DN of server's certificate */
576 int ocsp; /* OCSP status of peer cert */
579 #ifdef EXPERIMENTAL_DSN_INFO
580 const uschar *smtp_greeting; /* peer self-identification */
581 const uschar *helo_response; /* peer message */
584 uschar *authenticator; /* auth driver name used by transport */
585 uschar *auth_id; /* auth "login" name used by transport */
586 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
588 uschar *dsn_orcpt; /* DSN orcpt value */
589 int dsn_flags; /* DSN flags */
590 int dsn_aware; /* DSN aware flag */
593 const uschar * dkim_used; /* DKIM info, or NULL */
597 BOOL af_allow_file:1; /* allow file in generated address */
598 BOOL af_allow_pipe:1; /* allow pipe in generated address */
599 BOOL af_allow_reply:1; /* allow autoreply in generated address */
600 BOOL af_dr_retry_exists:1; /* router retry record exists */
601 BOOL af_expand_pipe:1; /* expand pipe arguments */
602 BOOL af_file:1; /* file delivery; always with pfr */
603 BOOL af_gid_set:1; /* gid field is set */
604 BOOL af_home_expanded:1; /* home_dir is already expanded */
605 BOOL af_initgroups:1; /* use initgroups() for local transporting */
606 BOOL af_local_host_removed:1; /* local host was backup */
607 BOOL af_lt_retry_exists:1; /* local transport retry exists */
608 BOOL af_pfr:1; /* pipe or file or reply delivery */
609 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
610 BOOL af_retry_timedout:1; /* true if retry timed out */
611 BOOL af_uid_set:1; /* uid field is set */
612 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
613 BOOL af_sverify_told:1; /* sender verify failure notified */
614 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
615 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
616 BOOL af_homonym:1; /* an ancestor has same address */
617 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
618 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
619 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
620 BOOL af_new_conn:1; /* delivered on an fresh TCP conn */
621 BOOL af_cont_conn:1; /* delivered (with new MAIL cmd) on an existing TCP conn */
622 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
623 BOOL af_pass_message:1; /* pass message in bounces */
624 BOOL af_bad_reply:1; /* filter could not generate autoreply */
625 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
626 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
627 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
628 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
629 #ifndef DISABLE_PIPE_CONNECT
630 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
633 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
635 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
636 BOOL af_force_command:1; /* force_command in pipe transport */
638 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
641 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
643 #ifndef DISABLE_TLS_RESUME
644 BOOL af_tls_resume:1; /* TLS used a resumed session */
648 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
649 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
650 int mode; /* mode for local transporting to a file */
651 int basic_errno; /* status after failure */
652 int more_errno; /* additional error information */
653 struct timeval delivery_time; /* time taken to do delivery/attempt */
655 unsigned short child_count; /* number of child addresses */
656 short int return_file; /* fileno of return data file */
657 short int special_action; /* ( used when when deferred or failed */
659 /* ( contains = or - when successful SMTP delivered */
661 /* ( contains verify rc in sender verify cache */
662 short int transport_return; /* result of delivery attempt */
663 address_item_propagated prop; /* fields that are propagated to children */
666 /* The table of header names consists of items of this type */
675 /* Chain of information about errors (e.g. bad addresses) */
677 typedef struct error_block {
678 struct error_block *next;
683 /* Chain of file names when processing the queue */
685 typedef struct queue_filename {
686 struct queue_filename *next;
691 /* Chain of items of retry information, read from the retry config. */
693 typedef struct retry_rule {
694 struct retry_rule *next;
701 typedef struct retry_config {
702 struct retry_config *next;
710 /* Structure for each node in a tree, of which there are various kinds */
712 typedef struct tree_node {
713 struct tree_node *left; /* pointer to left child */
714 struct tree_node *right; /* pointer to right child */
717 void *ptr; /* pointer to data */
718 int val; /* or integer data */
720 uschar balance; /* balancing factor */
721 uschar name[1]; /* node name - variable length */
724 /* Structure for holding time-limited data such as DNS returns.
725 We use this rather than extending tree_node to avoid wasting
726 space for most tree use (variables...) at the cost of complexity
727 for the lookups cache.
728 We also store any options used for the lookup. */
730 typedef struct expiring_data {
731 time_t expiry; /* if nonzero, data invalid after this time */
732 const uschar * opts; /* options, or NULL */
735 void * ptr; /* pointer to data */
736 int val; /* or integer data */
740 /* Structure for holding the handle and the cached last lookup for searches.
741 This block is pointed to by the tree entry for the file. The file can get
742 closed if too many are opened at once. There is a LRU chain for deciding which
745 typedef struct search_cache {
746 void *handle; /* lookup handle, or NULL if closed */
747 const lookup_info * li; /* info struct for search type */
748 tree_node *up; /* LRU up pointer */
749 tree_node *down; /* LRU down pointer */
750 tree_node *item_cache; /* tree of cached results */
753 /* Structure for holding a partially decoded DNS record; the name has been
754 uncompressed, but the data pointer is into the raw data. */
757 uschar name[DNS_MAXNAME]; /* domain name */
758 int type; /* record type */
759 unsigned short ttl; /* time-to-live, seconds */
760 int size; /* size of data */
761 const uschar *data; /* pointer to data */
764 /* Structure for holding the result of a DNS query. A touch over
765 64k big, so take care to release as soon as possible. */
768 int answerlen; /* length of the answer */
769 uschar answer[NS_MAXMSG]; /* the answer itself */
772 /* Structure for holding the intermediate data while scanning a DNS answer
776 int rrcount; /* count of RRs in the answer */
777 const uschar *aptr; /* pointer in the answer while scanning */
778 dns_record srr; /* data from current record in scan */
781 /* Structure for holding a chain of IP addresses that are extracted from
782 an A, AAAA, or A6 record. For the first two, there is only ever one address,
783 but the chaining feature of A6 allows for several addresses to be realized from
784 a single initial A6 record. The structure defines the address field of length
785 1. In use, a suitable sized block is obtained to hold the complete textual
788 typedef struct dns_address {
789 struct dns_address *next;
793 /* Structure used for holding intermediate data during MD5 computations. */
797 unsigned int abcd[4];
801 /* Structure used for holding intermediate data during SHA-1 computations. */
803 typedef struct sha1 {
808 /* Information for making an smtp connection */
810 transport_instance * tblock;
811 void * ob; /* smtp_transport_options_block * */
816 int sock; /* used for a bound but not connected socket */
817 uschar * sending_ip_address; /* used for TLS resumption */
818 const uschar * host_lbserver; /* ditto, for server-behind LB */
819 BOOL have_lbserver:1; /* host_lbserver is valid */
822 BOOL dane:1; /* connection must do dane */
823 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
827 /* A client-initiated connection. If TLS, the second element is non-NULL */
834 /* Structure used to hold incoming packets of SMTP responses for a specific
835 socket. The packets which may contain multiple lines (and in some cases,
836 multiple responses). */
838 typedef struct smtp_inblock {
839 client_conn_ctx * cctx; /* the connection */
840 int buffersize; /* the size of the buffer */
841 uschar *ptr; /* current position in the buffer */
842 uschar *ptrend; /* end of data in the buffer */
843 uschar *buffer; /* the buffer itself */
846 /* Structure used to hold buffered outgoing packets of SMTP commands for a
847 specific socket. The packets which may contain multiple lines when pipelining
850 typedef struct smtp_outblock {
851 client_conn_ctx * cctx; /* the connection */
852 int cmd_count; /* count of buffered commands */
853 int buffersize; /* the size of the buffer */
854 BOOL authenticating; /* TRUE when authenticating */
855 uschar *ptr; /* current position in the buffer */
856 uschar *buffer; /* the buffer itself */
858 smtp_connect_args * conn_args; /* to make connection, if not yet made */
861 /* Structure to hold information about the source of redirection information */
863 typedef struct redirect_block {
864 uschar *string; /* file name or string */
865 uid_t *owners; /* allowed file owners */
866 gid_t *owngroups; /* allowed file groups */
867 struct passwd *pw; /* possible owner if not NULL */
868 int modemask; /* forbidden bits */
869 BOOL isfile; /* TRUE if string is a file name */
870 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
871 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
874 /* Sieve control data */
876 typedef struct sieve_block {
877 const uschar * inbox;
878 const uschar * enotify_mailto_owner;
879 const uschar * subaddress;
880 const uschar * useraddress;
881 const uschar * vacation_dir;
884 /* Structure for passing arguments to check_host() */
886 typedef struct check_host_block {
887 const uschar *host_name;
888 const uschar *host_address;
889 const uschar *host_ipv4;
893 /* Structure for remembering lookup data when caching the result of
894 a lookup in a named list. */
896 typedef struct namedlist_cacheblock {
897 struct namedlist_cacheblock *next;
900 } namedlist_cacheblock;
902 /* Structure for holding data for an entry in a named list */
904 typedef struct namedlist_block {
905 const uschar *string; /* the list string */
906 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
907 short number; /* the number of the list for caching */
908 BOOL hide; /* -bP does not display value */
911 /* Structures for Access Control Lists */
913 typedef struct acl_condition_block {
914 struct acl_condition_block * next;
921 } acl_condition_block;
923 typedef struct acl_block {
924 struct acl_block * next;
925 acl_condition_block * condition;
928 const uschar * srcfile;
931 /* smtp transport calc outbound_ip */
932 typedef BOOL (*oicf) (uschar *message_id, void *data);
934 /* DKIM information for transport */
937 uschar *dkim_identity;
938 uschar *dkim_private_key;
939 uschar *dkim_selector;
941 uschar *dkim_sign_headers;
944 uschar *dkim_timestamps;
947 #ifdef EXPERIMENTAL_ARC
948 uschar *arc_signspec;
953 /* per-queue-runner info */
954 typedef struct qrunner {
955 struct qrunner * next; /* list sorted by next tick */
957 uschar * name; /* NULL for the default queue */
958 unsigned interval; /* tick rate, seconds. Zero for a one-time run */
959 time_t next_tick; /* next run should, or should have, start(ed) */
960 unsigned run_max; /* concurrent queue runner limit */
961 unsigned run_count; /* current runners */
963 BOOL queue_run_force :1;
964 BOOL deliver_force_thaw :1;
965 BOOL queue_run_first_delivery :1;
966 BOOL queue_run_local :1;
967 BOOL queue_2stage :1;
971 /* Types of variable table entry */
974 vtype_int, /* value is address of int */
975 vtype_filter_int, /* ditto, but recognized only when filtering */
976 vtype_ino, /* value is address of ino_t (not always an int) */
977 vtype_uid, /* value is address of uid_t (not always an int) */
978 vtype_gid, /* value is address of gid_t (not always an int) */
979 vtype_bool, /* value is address of bool */
980 vtype_stringptr, /* value is address of pointer to string */
981 vtype_msgbody, /* as stringptr, but read when first required */
982 vtype_msgbody_end, /* ditto, the end of the message */
983 vtype_msgheaders, /* the message's headers, processed */
984 vtype_msgheaders_raw, /* the message's headers, unprocessed */
985 vtype_localpart, /* extract local part from string */
986 vtype_domain, /* extract domain from string */
987 vtype_string_func, /* value is string returned by given function */
988 vtype_todbsdin, /* value not used; generate BSD inbox tod */
989 vtype_tode, /* value not used; generate tod in epoch format */
990 vtype_todel, /* value not used; generate tod in epoch/usec format */
991 vtype_todf, /* value not used; generate full tod */
992 vtype_todl, /* value not used; generate log tod */
993 vtype_todlf, /* value not used; generate log file datestamp tod */
994 vtype_todzone, /* value not used; generate time zone only */
995 vtype_todzulu, /* value not used; generate zulu tod */
996 vtype_reply, /* value not used; get reply from headers */
997 vtype_pid, /* value not used; result is pid */
998 vtype_host_lookup, /* value not used; get host name */
999 vtype_load_avg, /* value not used; result is int from os_getloadavg */
1000 vtype_pspace, /* partition space; value is T/F for spool/log */
1001 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
1002 vtype_cert, /* SSL certificate */
1003 #ifndef DISABLE_DKIM
1004 vtype_dkim, /* Lookup of value in DKIM signature */
1006 vtype_module, /* variable lives in a module; value is module name */
1009 /* Type for main variable table */
1019 /* dynamic-load module info */
1021 typedef struct misc_module_info {
1022 struct misc_module_info * next;
1024 const uschar * name;
1026 BOOL (*init)(void *); /* arg is the misc_module_info ptr */
1027 gstring * (*lib_vers_report)(gstring *); /* underlying library */
1028 int (*conn_init)(const uschar *, const uschar *);
1029 void (*smtp_reset)(void);
1030 int (*msg_init)(void);
1031 gstring * (*authres)(gstring *);
1034 unsigned options_count;
1036 unsigned functions_count;
1038 unsigned variables_count;
1041 #define MISC_MODULE_MAGIC 0x4d4d4d31 /* MMM1 */
1043 #endif /* whole file */
1044 /* End of structs.h */