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 struct transport_instance *next;
163 uschar *name; /* Instance name */
164 struct transport_info *info; /* Info for this driver */
165 void *options_block; /* Pointer to private options */
166 uschar *driver_name; /* Must be first */
167 const uschar *srcfile;
170 int (*setup)( /* Setup entry point */
171 struct transport_instance *,
172 struct address_item *,
173 struct transport_feedback *, /* For passing back config data */
174 uid_t, /* The uid that will be used */
175 gid_t, /* The gid that will be used */
176 uschar **); /* For an error message */
177 /**************************************/
178 int batch_max; /* ) */
179 uschar *batch_id; /* ) */
180 uschar *home_dir; /* ) Used only for local transports */
181 uschar *current_dir; /* ) */
182 /**************************************/
183 uschar *expand_multi_domain; /* ) */
184 BOOL multi_domain; /* ) */
185 BOOL overrides_hosts; /* ) Used only for remote transports */
186 uschar *max_addresses; /* ) */
187 int connection_max_messages;/* ) */
188 /**************************************/
189 BOOL deliver_as_creator; /* Used only by pipe at present */
190 BOOL disable_logging; /* For very weird requirements */
191 BOOL initgroups; /* Initialize groups when setting uid */
192 BOOL uid_set; /* uid is set */
193 BOOL gid_set; /* gid is set */
196 uschar *expand_uid; /* Variable uid */
197 uschar *expand_gid; /* Variable gid */
198 uschar *warn_message; /* Used only by appendfile at present */
199 uschar *shadow; /* Name of shadow transport */
200 uschar *shadow_condition; /* Condition for running it */
201 uschar *filter_command; /* For on-the-fly-filtering */
202 uschar *add_headers; /* Add these headers */
203 uschar *remove_headers; /* Remove these headers */
204 uschar *return_path; /* Overriding (rewriting) return path */
205 uschar *debug_string; /* Debugging output */
206 uschar *max_parallel; /* Number of concurrent instances */
207 uschar *message_size_limit; /* Biggest message this transport handles */
208 uschar *headers_rewrite; /* Rules for rewriting headers */
209 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
210 int rewrite_existflags; /* Bits showing which headers are rewritten */
211 int filter_timeout; /* For transport filter timing */
212 BOOL body_only; /* Deliver only the body */
213 BOOL delivery_date_add; /* Add Delivery-Date header */
214 BOOL envelope_to_add; /* Add Envelope-To header */
215 BOOL headers_only; /* Deliver only the headers */
216 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
217 BOOL return_path_add; /* Add Return-Path header */
218 BOOL return_output; /* TRUE if output should always be returned */
219 BOOL return_fail_output; /* ditto, but only on failure */
220 BOOL log_output; /* Similarly for logging */
221 BOOL log_fail_output;
222 BOOL log_defer_output;
223 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
224 #ifndef DISABLE_EVENT
225 uschar *event_action; /* String to expand on notable events */
227 } transport_instance;
230 /* Structure for holding information about a type of transport. The first six
231 fields must match driver_info above. */
233 typedef struct transport_info {
234 uschar *driver_name; /* Driver name */
235 optionlist *options; /* Table of private options names */
236 int *options_count; /* -> Number of entries in table */
237 void *options_block; /* Points to default private block */
238 int options_len; /* Length of same in bytes */
239 void (*init)( /* Initialization function */
240 struct transport_instance *);
242 BOOL (*code)( /* Main entry point */
243 transport_instance *,
244 struct address_item *);
245 void (*tidyup)( /* Tidyup function */
246 struct transport_instance *);
247 void (*closedown)( /* For closing down a passed channel */
248 struct transport_instance *);
249 BOOL local; /* TRUE for local transports */
253 /* smtp transport datachunk callback */
255 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
256 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
258 struct transport_context;
259 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
261 /* Structure for information about a delivery-in-progress */
263 typedef struct transport_context {
264 union { /* discriminated by option topt_output_string */
265 int fd; /* file descriptor to write message to */
266 gstring * msg; /* allocated string with written message */
268 transport_instance * tblock; /* transport */
269 struct address_item * addr;
270 uschar * check_string; /* string replacement */
271 uschar * escape_string;
272 int options; /* output processing topt_* */
274 /* items below only used with option topt_use_bdat */
275 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
286 /* Structure for holding information about the configured routers. */
288 typedef struct router_instance {
289 driver_instance drinst;
291 uschar *address_data; /* Arbitrary data */
292 #ifdef EXPERIMENTAL_BRIGHTMAIL
293 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
295 uschar *cannot_route_message; /* Used when routing fails */
296 uschar *condition; /* General condition */
297 uschar *current_directory; /* For use during delivery */
298 uschar *debug_string; /* Debugging output */
299 uschar *domains; /* Specific domains */
300 uschar *errors_to; /* Errors address */
301 uschar *expand_gid; /* Expanded gid string */
302 uschar *expand_uid; /* Expanded uid string */
303 uschar *expand_more; /* Expanded more string */
304 uschar *expand_unseen; /* Expanded unseen string */
305 uschar *extra_headers; /* Additional headers */
306 uschar *fallback_hosts; /* For remote transports (text list) */
307 uschar *home_directory; /* For use during delivery */
308 uschar *ignore_target_hosts; /* Target hosts to ignore */
309 uschar *local_parts; /* Specific local parts */
310 uschar *pass_router_name; /* Router for passed address */
311 uschar *prefix; /* Address prefix */
312 uschar *redirect_router_name; /* Router for generated address */
313 uschar *remove_headers; /* Removed headers */
314 uschar *require_files; /* File checks before router is run */
315 uschar *router_home_directory; /* For use while routing */
316 uschar *self; /* Text option for handling self reference */
317 uschar *senders; /* Specific senders */
318 uschar *suffix; /* Address suffix */
319 uschar *translate_ip_address; /* IP address translation fudgery */
320 uschar *transport_name; /* Transport name */
322 BOOL address_test; /* Use this router when testing addresses */
323 #ifdef EXPERIMENTAL_BRIGHTMAIL
324 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
325 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
326 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
328 BOOL expn; /* Use this router when processing EXPN */
329 BOOL caseful_local_part; /* TRUE => don't lowercase */
330 BOOL check_local_user; /* TRUE => check local user */
331 BOOL disable_logging; /* For very weird requirements */
332 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
333 BOOL fail_verify_sender; /* Fail verify if sender match this router */
334 BOOL gid_set; /* Flag to indicate gid is set */
335 BOOL initgroups; /* TRUE if initgroups is required */
336 BOOL log_as_local; /* TRUE logs as a local delivery */
337 BOOL more; /* If FALSE, do no more if this one fails */
338 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
339 BOOL prefix_optional; /* Just what it says */
340 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
341 BOOL retry_use_local_part; /* Just what it says */
342 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
343 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
344 uschar *set; /* Variable = value to set; list */
345 BOOL suffix_optional; /* As it says */
346 BOOL verify_only; /* Skip this router if not verifying */
347 BOOL verify_recipient; /* Use this router when verifying a recipient*/
348 BOOL verify_sender; /* Use this router when verifying a sender */
349 BOOL uid_set; /* Flag to indicate uid is set */
350 BOOL unseen; /* If TRUE carry on, even after success */
351 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
353 int self_code; /* Encoded version of "self" */
354 uid_t uid; /* Fixed uid value */
355 gid_t gid; /* Fixed gid value */
357 host_item *fallback_hostlist; /* For remote transport (block chain) */
358 transport_instance *transport; /* Transport block (when found) */
359 struct router_instance *pass_router; /* Actual router for passed address */
360 struct router_instance *redirect_router; /* Actual router for generated address */
362 dnssec_domains dnssec;
366 /* Structure for holding information about a type of router. The first element
367 must be a struct driver_info, to match auths and transports. */
369 typedef struct router_info {
372 int (*code)( /* Main entry point */
374 struct address_item *,
377 struct address_item **,
378 struct address_item **,
379 struct address_item **,
380 struct address_item **);
381 void (*tidyup)( /* Tidyup function */
382 struct router_instance *);
383 int ri_flags; /* Descriptive flags */
387 /* Structure for holding information about a lookup type. */
389 #include "lookupapi.h"
392 /* Structure for holding information about the configured authentication
395 typedef struct auth_instance {
396 struct auth_instance *next;
397 uschar *name; /* Exim instance name */
398 struct auth_info *info; /* Pointer to driver info block */
399 void *options_block; /* Pointer to private options */
400 uschar *driver_name; /* Must be first */
401 const uschar *srcfile;
404 uschar *advertise_condition; /* Are we going to advertise this?*/
405 uschar *client_condition; /* Should the client try this? */
406 uschar *public_name; /* Advertised name */
407 uschar *set_id; /* String to set when server as authenticated id */
408 uschar *set_client_id; /* String to set when client as client_authenticated id */
409 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
410 uschar *server_debug_string; /* Debugging output */
411 uschar *server_condition; /* Authorization condition */
412 BOOL client; /* TRUE if client option(s) set */
413 BOOL server; /* TRUE if server options(s) set */
414 BOOL advertised; /* Set TRUE when advertised */
418 /* Structure for holding information about an authentication mechanism. The
419 first six fields must match driver_info above. */
421 typedef struct auth_info {
422 uschar *driver_name; /* e.g. "condition" */
423 optionlist *options; /* Table of private options names */
424 int *options_count; /* -> Number of entries in table */
425 void *options_block; /* Points to default private block */
426 int options_len; /* Length of same in bytes */
427 void (*init)( /* initialization function */
428 struct auth_instance *);
430 int (*servercode)( /* server function */
431 auth_instance *, /* the instance data */
432 uschar *); /* rest of AUTH command */
433 int (*clientcode)( /* client function */
434 struct auth_instance *,
435 void *, /* smtp conn, with socket, output and input buffers */
436 int, /* command timeout */
437 uschar *, /* buffer for reading response */
438 int); /* sizeof buffer */
439 gstring * (*version_report)( /* diagnostic version reporting */
440 gstring *); /* string to append to */
441 void (*macros_create)(void); /* feature-macro creation */
445 /* Structure for holding a single IP address and port; used for the chain of
446 addresses and ports for the local host. Make the char string large enough to
447 hold an IPv6 address. */
449 typedef struct ip_address_item {
450 struct ip_address_item *next;
452 BOOL v6_include_v4; /* Used in the daemon */
454 uschar * log; /* portion of "listening on" log line */
457 /* Structure for chaining together arbitrary strings. */
459 typedef struct string_item {
460 struct string_item * next;
464 /* Information about a soft delivery failure, for use when calculating
465 retry information. It's separate from the address block, because there
466 can be a chain of them for SMTP deliveries where multiple IP addresses
469 typedef struct retry_item {
470 struct retry_item *next; /* for chaining */
471 const uschar *key; /* string identifying host/address/message */
472 int basic_errno; /* error code for this destination */
473 int more_errno; /* additional error information */
474 uschar *message; /* local error message */
475 int flags; /* see below */
478 /* Retry data flags */
480 #define rf_delete 0x0001 /* retry info is to be deleted */
481 #define rf_host 0x0002 /* retry info is for a remote host */
482 #define rf_message 0x0004 /* retry info is for a host+message */
484 /* Information about a constructed message that is to be sent using the
485 autoreply transport. This is pointed to from the address block. */
487 typedef struct reply_item {
488 uschar *from; /* ) */
489 uschar *reply_to; /* ) */
491 uschar *cc; /* ) specific header fields */
493 uschar *subject; /* ) */
494 uschar *headers; /* misc other headers, concatenated */
495 uschar *text; /* text string body */
496 uschar *file; /* file body */
497 BOOL file_expand; /* expand the body */
498 int expand_forbid; /* expansion lockout flags */
499 uschar *logfile; /* file to keep a log in */
500 uschar *oncelog; /* file to keep records in for once only */
501 time_t once_repeat; /* time to repeat "once only" */
502 BOOL return_message; /* send back the original message */
506 /* The address_item structure contains many fields which are used at various
507 times while delivering a message. Some are used only for remote deliveries;
508 some only for local. A particular set of fields is copied whenever a child
509 address is created. For convenience, we keep those fields in a separate
510 sub-structure so they can be copied in one go. This also means I won't forget
511 to edit the various copying places when new to-be-copied fields are added. */
513 typedef struct address_item_propagated {
514 uschar *address_data; /* arbitrary data to keep with the address */
515 uschar *domain_data; /* from "domains" lookup */
516 uschar *localpart_data; /* from "local_parts" lookup */
517 const uschar *errors_address; /* where to send errors (NULL => sender) */
518 header_line *extra_headers; /* additional headers */
519 uschar *remove_headers; /* list of those to remove */
520 void *variables; /* router-vasriables */
522 BOOL ignore_error:1; /* ignore delivery error */
524 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
525 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
526 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
528 } address_item_propagated;
531 /* The main address structure. Note that fields that are to be copied to
532 generated addresses should be put in the address_item_propagated structure (see
533 above) rather than directly into the address_item structure. */
535 typedef struct address_item {
536 struct address_item *next; /* for chaining addresses */
537 struct address_item *parent; /* parent address */
538 struct address_item *first; /* points to first after group delivery */
539 struct address_item *dupof; /* points to address this is a duplicate of */
541 router_instance *start_router; /* generated address starts here */
542 router_instance *router; /* the router that routed */
543 transport_instance *transport; /* the transport to use */
545 host_item *host_list; /* host data for the transport */
546 host_item *host_used; /* host that took delivery or failed hard */
547 host_item *fallback_hosts; /* to try if delivery defers */
549 reply_item *reply; /* data for autoreply */
550 retry_item *retries; /* chain of retry information */
552 const uschar *address; /* address being delivered or routed */
553 uschar *unique; /* used for disambiguating */
554 const uschar *cc_local_part; /* caseful local part */
555 const uschar *lc_local_part; /* lowercased local part */
556 const uschar *local_part; /* points to cc or lc version */
557 const uschar *prefix; /* stripped prefix of local part */
558 const uschar *prefix_v; /* variable part of above */
559 const uschar *suffix; /* stripped suffix of local part */
560 const uschar *suffix_v; /* variable part of above */
561 const uschar *domain; /* working domain (lower cased) */
563 uschar *address_retry_key; /* retry key including full address */
564 uschar *domain_retry_key; /* retry key for domain only */
566 uschar *current_dir; /* current directory for transporting */
567 uschar *home_dir; /* home directory for transporting */
568 uschar *message; /* error message */
569 uschar *user_message; /* error message that can be sent over SMTP
570 or quoted in bounce message */
571 const uschar *onetime_parent; /* saved original parent for onetime */
572 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
573 uschar *return_filename; /* name of return file */
574 uschar *self_hostname; /* after self=pass */
575 uschar *shadow_message; /* info about shadow transporting */
577 uid_t uid; /* uid for transporting */
578 gid_t gid; /* gid for transporting */
581 const uschar *tlsver; /* version used for transport */
582 uschar *cipher; /* Cipher used for transport */
583 void *ourcert; /* Certificate offered to peer, binary */
584 void *peercert; /* Certificate from peer, binary */
585 uschar *peerdn; /* DN of server's certificate */
586 int ocsp; /* OCSP status of peer cert */
589 #ifdef EXPERIMENTAL_DSN_INFO
590 const uschar *smtp_greeting; /* peer self-identification */
591 const uschar *helo_response; /* peer message */
594 uschar *authenticator; /* auth driver name used by transport */
595 uschar *auth_id; /* auth "login" name used by transport */
596 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
598 uschar *dsn_orcpt; /* DSN orcpt value */
599 int dsn_flags; /* DSN flags */
600 int dsn_aware; /* DSN aware flag */
603 const uschar * dkim_used; /* DKIM info, or NULL */
607 BOOL af_allow_file:1; /* allow file in generated address */
608 BOOL af_allow_pipe:1; /* allow pipe in generated address */
609 BOOL af_allow_reply:1; /* allow autoreply in generated address */
610 BOOL af_dr_retry_exists:1; /* router retry record exists */
611 BOOL af_expand_pipe:1; /* expand pipe arguments */
612 BOOL af_file:1; /* file delivery; always with pfr */
613 BOOL af_gid_set:1; /* gid field is set */
614 BOOL af_home_expanded:1; /* home_dir is already expanded */
615 BOOL af_initgroups:1; /* use initgroups() for local transporting */
616 BOOL af_local_host_removed:1; /* local host was backup */
617 BOOL af_lt_retry_exists:1; /* local transport retry exists */
618 BOOL af_pfr:1; /* pipe or file or reply delivery */
619 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
620 BOOL af_retry_timedout:1; /* true if retry timed out */
621 BOOL af_uid_set:1; /* uid field is set */
622 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
623 BOOL af_sverify_told:1; /* sender verify failure notified */
624 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
625 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
626 BOOL af_homonym:1; /* an ancestor has same address */
627 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
628 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
629 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
630 BOOL af_new_conn:1; /* delivered on an fresh TCP conn */
631 BOOL af_cont_conn:1; /* delivered (with new MAIL cmd) on an existing TCP conn */
632 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
633 BOOL af_pass_message:1; /* pass message in bounces */
634 BOOL af_bad_reply:1; /* filter could not generate autoreply */
635 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
636 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
637 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
638 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
639 #ifndef DISABLE_PIPE_CONNECT
640 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
643 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
645 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
646 BOOL af_force_command:1; /* force_command in pipe transport */
648 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
651 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
653 #ifndef DISABLE_TLS_RESUME
654 BOOL af_tls_resume:1; /* TLS used a resumed session */
658 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
659 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
660 int mode; /* mode for local transporting to a file */
661 int basic_errno; /* status after failure */
662 int more_errno; /* additional error information */
663 struct timeval delivery_time; /* time taken to do delivery/attempt */
665 unsigned short child_count; /* number of child addresses */
666 short int return_file; /* fileno of return data file */
667 short int special_action; /* ( used when when deferred or failed */
669 /* ( contains = or - when successful SMTP delivered */
671 /* ( contains verify rc in sender verify cache */
672 short int transport_return; /* result of delivery attempt */
673 address_item_propagated prop; /* fields that are propagated to children */
676 /* The table of header names consists of items of this type */
685 /* Chain of information about errors (e.g. bad addresses) */
687 typedef struct error_block {
688 struct error_block *next;
693 /* Chain of file names when processing the queue */
695 typedef struct queue_filename {
696 struct queue_filename *next;
701 /* Chain of items of retry information, read from the retry config. */
703 typedef struct retry_rule {
704 struct retry_rule *next;
711 typedef struct retry_config {
712 struct retry_config *next;
720 /* Structure for each node in a tree, of which there are various kinds */
722 typedef struct tree_node {
723 struct tree_node *left; /* pointer to left child */
724 struct tree_node *right; /* pointer to right child */
727 void *ptr; /* pointer to data */
728 int val; /* or integer data */
730 uschar balance; /* balancing factor */
731 uschar name[1]; /* node name - variable length */
734 /* Structure for holding time-limited data such as DNS returns.
735 We use this rather than extending tree_node to avoid wasting
736 space for most tree use (variables...) at the cost of complexity
737 for the lookups cache.
738 We also store any options used for the lookup. */
740 typedef struct expiring_data {
741 time_t expiry; /* if nonzero, data invalid after this time */
742 const uschar * opts; /* options, or NULL */
745 void * ptr; /* pointer to data */
746 int val; /* or integer data */
750 /* Structure for holding the handle and the cached last lookup for searches.
751 This block is pointed to by the tree entry for the file. The file can get
752 closed if too many are opened at once. There is a LRU chain for deciding which
755 typedef struct search_cache {
756 void *handle; /* lookup handle, or NULL if closed */
757 int search_type; /* search type */
758 tree_node *up; /* LRU up pointer */
759 tree_node *down; /* LRU down pointer */
760 tree_node *item_cache; /* tree of cached results */
763 /* Structure for holding a partially decoded DNS record; the name has been
764 uncompressed, but the data pointer is into the raw data. */
767 uschar name[DNS_MAXNAME]; /* domain name */
768 int type; /* record type */
769 unsigned short ttl; /* time-to-live, seconds */
770 int size; /* size of data */
771 const uschar *data; /* pointer to data */
774 /* Structure for holding the result of a DNS query. A touch over
775 64k big, so take care to release as soon as possible. */
778 int answerlen; /* length of the answer */
779 uschar answer[NS_MAXMSG]; /* the answer itself */
782 /* Structure for holding the intermediate data while scanning a DNS answer
786 int rrcount; /* count of RRs in the answer */
787 const uschar *aptr; /* pointer in the answer while scanning */
788 dns_record srr; /* data from current record in scan */
791 /* Structure for holding a chain of IP addresses that are extracted from
792 an A, AAAA, or A6 record. For the first two, there is only ever one address,
793 but the chaining feature of A6 allows for several addresses to be realized from
794 a single initial A6 record. The structure defines the address field of length
795 1. In use, a suitable sized block is obtained to hold the complete textual
798 typedef struct dns_address {
799 struct dns_address *next;
803 /* Structure used for holding intermediate data during MD5 computations. */
807 unsigned int abcd[4];
811 /* Structure used for holding intermediate data during SHA-1 computations. */
813 typedef struct sha1 {
818 /* Information for making an smtp connection */
820 transport_instance * tblock;
821 void * ob; /* smtp_transport_options_block * */
826 int sock; /* used for a bound but not connected socket */
827 uschar * sending_ip_address; /* used for TLS resumption */
828 const uschar * host_lbserver; /* ditto, for server-behind LB */
829 BOOL have_lbserver:1; /* host_lbserver is valid */
832 BOOL dane:1; /* connection must do dane */
833 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
837 /* A client-initiated connection. If TLS, the second element is non-NULL */
844 /* Structure used to hold incoming packets of SMTP responses for a specific
845 socket. The packets which may contain multiple lines (and in some cases,
846 multiple responses). */
848 typedef struct smtp_inblock {
849 client_conn_ctx * cctx; /* the connection */
850 int buffersize; /* the size of the buffer */
851 uschar *ptr; /* current position in the buffer */
852 uschar *ptrend; /* end of data in the buffer */
853 uschar *buffer; /* the buffer itself */
856 /* Structure used to hold buffered outgoing packets of SMTP commands for a
857 specific socket. The packets which may contain multiple lines when pipelining
860 typedef struct smtp_outblock {
861 client_conn_ctx * cctx; /* the connection */
862 int cmd_count; /* count of buffered commands */
863 int buffersize; /* the size of the buffer */
864 BOOL authenticating; /* TRUE when authenticating */
865 uschar *ptr; /* current position in the buffer */
866 uschar *buffer; /* the buffer itself */
868 smtp_connect_args * conn_args; /* to make connection, if not yet made */
871 /* Structure to hold information about the source of redirection information */
873 typedef struct redirect_block {
874 uschar *string; /* file name or string */
875 uid_t *owners; /* allowed file owners */
876 gid_t *owngroups; /* allowed file groups */
877 struct passwd *pw; /* possible owner if not NULL */
878 int modemask; /* forbidden bits */
879 BOOL isfile; /* TRUE if string is a file name */
880 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
881 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
884 /* Sieve control data */
886 typedef struct sieve_block {
887 const uschar * inbox;
888 const uschar * enotify_mailto_owner;
889 const uschar * subaddress;
890 const uschar * useraddress;
891 const uschar * vacation_dir;
894 /* Structure for passing arguments to check_host() */
896 typedef struct check_host_block {
897 const uschar *host_name;
898 const uschar *host_address;
899 const uschar *host_ipv4;
903 /* Structure for remembering lookup data when caching the result of
904 a lookup in a named list. */
906 typedef struct namedlist_cacheblock {
907 struct namedlist_cacheblock *next;
910 } namedlist_cacheblock;
912 /* Structure for holding data for an entry in a named list */
914 typedef struct namedlist_block {
915 const uschar *string; /* the list string */
916 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
917 short number; /* the number of the list for caching */
918 BOOL hide; /* -bP does not display value */
921 /* Structures for Access Control Lists */
923 typedef struct acl_condition_block {
924 struct acl_condition_block * next;
931 } acl_condition_block;
933 typedef struct acl_block {
934 struct acl_block * next;
935 acl_condition_block * condition;
938 const uschar * srcfile;
941 /* smtp transport calc outbound_ip */
942 typedef BOOL (*oicf) (uschar *message_id, void *data);
944 /* DKIM information for transport */
947 uschar *dkim_identity;
948 uschar *dkim_private_key;
949 uschar *dkim_selector;
951 uschar *dkim_sign_headers;
954 uschar *dkim_timestamps;
957 #ifdef EXPERIMENTAL_ARC
958 uschar *arc_signspec;
963 /* per-queue-runner info */
964 typedef struct qrunner {
965 struct qrunner * next; /* list sorted by next tick */
967 uschar * name; /* NULL for the default queue */
968 unsigned interval; /* tick rate, seconds. Zero for a one-time run */
969 time_t next_tick; /* next run should, or should have, start(ed) */
970 unsigned run_max; /* concurrent queue runner limit */
971 unsigned run_count; /* current runners */
973 BOOL queue_run_force :1;
974 BOOL deliver_force_thaw :1;
975 BOOL queue_run_first_delivery :1;
976 BOOL queue_run_local :1;
977 BOOL queue_2stage :1;
980 /* End of structs.h */