1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* Definitions of various structures. In addition, those that are visible for
11 the compilation of local_scan() are defined in local_scan.h. These are
17 For those declared here, we have to pre-declare some because of mutually
18 recursive definitions in the auths, routers, and transports blocks. */
26 struct transport_info;
30 typedef struct gstring {
31 int size; /* Current capacity of string memory */
32 int ptr; /* Offset at which to append further chars */
33 uschar * s; /* The string memory */
36 /* Structure for remembering macros for the configuration file */
38 typedef struct macro_item {
39 struct macro_item * next;
44 const uschar * replacement;
47 /* Structure for bit tables for debugging and logging */
49 typedef struct bit_table {
54 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
56 typedef struct ugid_block {
64 typedef enum { CHUNKING_NOT_OFFERED = -1,
67 CHUNKING_LAST} chunking_state_t;
69 typedef enum { TFO_NOT_USED = 0,
73 TFO_USED_DATA } tfo_state_t;
75 /* Structure for holding information about a host for use mainly by routers,
76 but also used when checking lists of hosts and when transporting. Looking up
77 host addresses is done using this structure. */
79 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
81 typedef struct host_item {
82 struct host_item *next;
83 const uschar *name; /* Host name */
84 const uschar *address; /* IP address in text form */
85 int port; /* port value in host order (if SRV lookup) */
86 int mx; /* MX value if found via MX records */
87 int sort_key; /* MX*1000 plus random "fraction" */
88 int status; /* Usable, unusable, or unknown */
89 int why; /* Why host is unusable */
90 int last_try; /* Time of last try if known */
91 dnssec_status_t dnssec;
94 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
95 rewrite_headers field of a transport. */
97 typedef struct rewrite_rule {
98 struct rewrite_rule *next;
104 /* This structure is used to pass back configuration data from the smtp
105 transport to the outside world. It is used during callback processing. If ever
106 another remote transport were implemented, it could use the same structure. */
108 typedef struct transport_feedback {
115 BOOL hosts_randomize;
119 } transport_feedback;
121 /* Routers, transports, and authenticators have similar data blocks. Each
122 driver that is compiled into the code is represented by a xxx_info block; the
123 active drivers are represented by a chain of xxx_instance blocks. To make it
124 possible to use the same code for reading the configuration files for all
125 three, the layout of the start of the blocks is kept the same, and represented
126 by the generic structures driver_info and driver_instance. */
128 typedef struct driver_instance {
129 struct driver_instance *next;
130 uschar *name; /* Instance name */
131 struct driver_info *info; /* Points to info for this driver */
132 void *options_block; /* Pointer to private options */
133 uschar *driver_name; /* All start with this generic option */
136 typedef struct driver_info {
137 uschar *driver_name; /* Name of driver */
138 optionlist *options; /* Table of private options names */
139 int *options_count; /* -> Number of entries in table */
140 void *options_block; /* Points to default private block */
141 int options_len; /* Length of same in bytes */
142 void (*init)( /* Initialization entry point */
143 struct driver_instance *);
147 /* Structure for holding information about the configured transports. Some
148 of the generally accessible options are set from the configuration file; others
149 are set by transport initialization, since they can only be set for certain
150 transports. They need to be generally accessible, however, as they are used by
151 the main transport code. */
153 typedef struct transport_instance {
154 struct transport_instance *next;
155 uschar *name; /* Instance name */
156 struct transport_info *info; /* Info for this driver */
157 void *options_block; /* Pointer to private options */
158 uschar *driver_name; /* Must be first */
159 int (*setup)( /* Setup entry point */
160 struct transport_instance *,
161 struct address_item *,
162 struct transport_feedback *, /* For passing back config data */
163 uid_t, /* The uid that will be used */
164 gid_t, /* The gid that will be used */
165 uschar **); /* For an error message */
166 /**************************************/
167 int batch_max; /* ) */
168 uschar *batch_id; /* ) */
169 uschar *home_dir; /* ) Used only for local transports */
170 uschar *current_dir; /* ) */
171 /**************************************/
172 uschar *expand_multi_domain; /* ) */
173 BOOL multi_domain; /* ) */
174 BOOL overrides_hosts; /* ) Used only for remote transports */
175 int max_addresses; /* ) */
176 int connection_max_messages;/* ) */
177 /**************************************/
178 BOOL deliver_as_creator; /* Used only by pipe at present */
179 BOOL disable_logging; /* For very weird requirements */
180 BOOL initgroups; /* Initialize groups when setting uid */
181 BOOL uid_set; /* uid is set */
182 BOOL gid_set; /* gid is set */
185 uschar *expand_uid; /* Variable uid */
186 uschar *expand_gid; /* Variable gid */
187 uschar *warn_message; /* Used only by appendfile at present */
188 uschar *shadow; /* Name of shadow transport */
189 uschar *shadow_condition; /* Condition for running it */
190 uschar *filter_command; /* For on-the-fly-filtering */
191 uschar *add_headers; /* Add these headers */
192 uschar *remove_headers; /* Remove these headers */
193 uschar *return_path; /* Overriding (rewriting) return path */
194 uschar *debug_string; /* Debugging output */
195 uschar *max_parallel; /* Number of concurrent instances */
196 uschar *message_size_limit; /* Biggest message this transport handles */
197 uschar *headers_rewrite; /* Rules for rewriting headers */
198 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
199 int rewrite_existflags; /* Bits showing which headers are rewritten */
200 int filter_timeout; /* For transport filter timing */
201 BOOL body_only; /* Deliver only the body */
202 BOOL delivery_date_add; /* Add Delivery-Date header */
203 BOOL envelope_to_add; /* Add Envelope-To header */
204 BOOL headers_only; /* Deliver only the headers */
205 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
206 BOOL return_path_add; /* Add Return-Path header */
207 BOOL return_output; /* TRUE if output should always be returned */
208 BOOL return_fail_output; /* ditto, but only on failure */
209 BOOL log_output; /* Similarly for logging */
210 BOOL log_fail_output;
211 BOOL log_defer_output;
212 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
213 #ifndef DISABLE_EVENT
214 uschar *event_action; /* String to expand on notable events */
216 } transport_instance;
219 /* Structure for holding information about a type of transport. The first six
220 fields must match driver_info above. */
222 typedef struct transport_info {
223 uschar *driver_name; /* Driver name */
224 optionlist *options; /* Table of private options names */
225 int *options_count; /* -> Number of entries in table */
226 void *options_block; /* Points to default private block */
227 int options_len; /* Length of same in bytes */
228 void (*init)( /* Initialization function */
229 struct transport_instance *);
231 BOOL (*code)( /* Main entry point */
232 transport_instance *,
233 struct address_item *);
234 void (*tidyup)( /* Tidyup function */
235 struct transport_instance *);
236 void (*closedown)( /* For closing down a passed channel */
237 struct transport_instance *);
238 BOOL local; /* TRUE for local transports */
242 /* smtp transport datachunk callback */
244 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
245 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
247 struct transport_context;
248 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
250 /* Structure for information about a delivery-in-progress */
252 typedef struct transport_context {
253 union { /* discriminated by option topt_output_string */
254 int fd; /* file descriptor to write message to */
255 gstring * msg; /* allocated string with written message */
257 transport_instance * tblock; /* transport */
258 struct address_item * addr;
259 uschar * check_string; /* string replacement */
260 uschar * escape_string;
261 int options; /* output processing topt_* */
263 /* items below only used with option topt_use_bdat */
264 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
275 /* Structure for holding information about the configured routers. */
277 typedef struct router_instance {
278 struct router_instance *next;
280 struct router_info *info;
281 void *options_block; /* Pointer to private options */
282 uschar *driver_name; /* Must be first */
284 uschar *address_data; /* Arbitrary data */
285 #ifdef EXPERIMENTAL_BRIGHTMAIL
286 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
288 uschar *cannot_route_message; /* Used when routing fails */
289 uschar *condition; /* General condition */
290 uschar *current_directory; /* For use during delivery */
291 uschar *debug_string; /* Debugging output */
292 uschar *domains; /* Specific domains */
293 uschar *errors_to; /* Errors address */
294 uschar *expand_gid; /* Expanded gid string */
295 uschar *expand_uid; /* Expanded uid string */
296 uschar *expand_more; /* Expanded more string */
297 uschar *expand_unseen; /* Expanded unseen string */
298 uschar *extra_headers; /* Additional headers */
299 uschar *fallback_hosts; /* For remote transports (text list) */
300 uschar *home_directory; /* For use during delivery */
301 uschar *ignore_target_hosts; /* Target hosts to ignore */
302 uschar *local_parts; /* Specific local parts */
303 uschar *pass_router_name; /* Router for passed address */
304 uschar *prefix; /* Address prefix */
305 uschar *redirect_router_name; /* Router for generated address */
306 uschar *remove_headers; /* Removed headers */
307 uschar *require_files; /* File checks before router is run */
308 uschar *router_home_directory; /* For use while routing */
309 uschar *self; /* Text option for handling self reference */
310 uschar *senders; /* Specific senders */
311 uschar *suffix; /* Address suffix */
312 uschar *translate_ip_address; /* IP address translation fudgery */
313 uschar *transport_name; /* Transport name */
315 BOOL address_test; /* Use this router when testing addresses */
316 #ifdef EXPERIMENTAL_BRIGHTMAIL
317 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
318 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
319 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
321 BOOL expn; /* Use this router when processing EXPN */
322 BOOL caseful_local_part; /* TRUE => don't lowercase */
323 BOOL check_local_user; /* TRUE => check local user */
324 BOOL disable_logging; /* For very weird requirements */
325 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
326 BOOL fail_verify_sender; /* Fail verify if sender match this router */
327 BOOL gid_set; /* Flag to indicate gid is set */
328 BOOL initgroups; /* TRUE if initgroups is required */
329 BOOL log_as_local; /* TRUE logs as a local delivery */
330 BOOL more; /* If FALSE, do no more if this one fails */
331 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
332 BOOL prefix_optional; /* Just what it says */
333 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
334 BOOL retry_use_local_part; /* Just what it says */
335 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
336 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
337 uschar *set; /* Variable = value to set; list */
338 BOOL suffix_optional; /* As it says */
339 BOOL verify_only; /* Skip this router if not verifying */
340 BOOL verify_recipient; /* Use this router when verifying a recipient*/
341 BOOL verify_sender; /* Use this router when verifying a sender */
342 BOOL uid_set; /* Flag to indicate uid is set */
343 BOOL unseen; /* If TRUE carry on, even after success */
344 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
346 int self_code; /* Encoded version of "self" */
347 uid_t uid; /* Fixed uid value */
348 gid_t gid; /* Fixed gid value */
350 host_item *fallback_hostlist; /* For remote transport (block chain) */
351 transport_instance *transport; /* Transport block (when found) */
352 struct router_instance *pass_router; /* Actual router for passed address */
353 struct router_instance *redirect_router; /* Actual router for generated address */
355 dnssec_domains dnssec;
359 /* Structure for holding information about a type of router. The first six
360 fields must match driver_info above. */
362 typedef struct router_info {
364 optionlist *options; /* Table of private options names */
365 int *options_count; /* -> Number of entries in table */
366 void *options_block; /* Points to default private block */
367 int options_len; /* Length of same in bytes */
368 void (*init)( /* Initialization function */
369 struct router_instance *);
371 int (*code)( /* Main entry point */
373 struct address_item *,
376 struct address_item **,
377 struct address_item **,
378 struct address_item **,
379 struct address_item **);
380 void (*tidyup)( /* Tidyup function */
381 struct router_instance *);
382 int ri_flags; /* Descriptive flags */
386 /* Structure for holding information about a lookup type. */
388 #include "lookupapi.h"
391 /* Structure for holding information about the configured authentication
394 typedef struct auth_instance {
395 struct auth_instance *next;
396 uschar *name; /* Exim instance name */
397 struct auth_info *info; /* Pointer to driver info block */
398 void *options_block; /* Pointer to private options */
399 uschar *driver_name; /* Must be first */
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 six fields must match driver_info above. */
417 typedef struct auth_info {
418 uschar *driver_name; /* e.g. "condition" */
419 optionlist *options; /* Table of private options names */
420 int *options_count; /* -> Number of entries in table */
421 void *options_block; /* Points to default private block */
422 int options_len; /* Length of same in bytes */
423 void (*init)( /* initialization function */
424 struct auth_instance *);
426 int (*servercode)( /* server function */
427 auth_instance *, /* the instance data */
428 uschar *); /* rest of AUTH command */
429 int (*clientcode)( /* client function */
430 struct auth_instance *,
431 void *, /* smtp conn, with socket, output and input buffers */
432 int, /* command timeout */
433 uschar *, /* buffer for reading response */
434 int); /* sizeof buffer */
435 void (*version_report)( /* diagnostic version reporting */
436 FILE *); /* I/O stream to print to */
437 void (*macros_create)(void); /* feature-macro creation */
441 /* Structure for holding a single IP address and port; used for the chain of
442 addresses and ports for the local host. Make the char string large enough to
443 hold an IPv6 address. */
445 typedef struct ip_address_item {
446 struct ip_address_item *next;
448 BOOL v6_include_v4; /* Used in the daemon */
450 uschar * log; /* portion of "listening on" log line */
453 /* Structure for chaining together arbitrary strings. */
455 typedef struct string_item {
456 struct string_item *next;
460 /* Information about a soft delivery failure, for use when calculating
461 retry information. It's separate from the address block, because there
462 can be a chain of them for SMTP deliveries where multiple IP addresses
465 typedef struct retry_item {
466 struct retry_item *next; /* for chaining */
467 uschar *key; /* string identifying host/address/message */
468 int basic_errno; /* error code for this destination */
469 int more_errno; /* additional error information */
470 uschar *message; /* local error message */
471 int flags; /* see below */
474 /* Retry data flags */
476 #define rf_delete 0x0001 /* retry info is to be deleted */
477 #define rf_host 0x0002 /* retry info is for a remote host */
478 #define rf_message 0x0004 /* retry info is for a host+message */
480 /* Information about a constructed message that is to be sent using the
481 autoreply transport. This is pointed to from the address block. */
483 typedef struct reply_item {
484 uschar *from; /* ) */
485 uschar *reply_to; /* ) */
487 uschar *cc; /* ) specific header fields */
489 uschar *subject; /* ) */
490 uschar *headers; /* misc other headers, concatenated */
491 uschar *text; /* text string body */
492 uschar *file; /* file body */
493 BOOL file_expand; /* expand the body */
494 int expand_forbid; /* expansion lockout flags */
495 uschar *logfile; /* file to keep a log in */
496 uschar *oncelog; /* file to keep records in for once only */
497 time_t once_repeat; /* time to repeat "once only" */
498 BOOL return_message; /* send back the original message */
502 /* The address_item structure contains many fields which are used at various
503 times while delivering a message. Some are used only for remote deliveries;
504 some only for local. A particular set of fields is copied whenever a child
505 address is created. For convenience, we keep those fields in a separate
506 sub-structure so they can be copied in one go. This also means I won't forget
507 to edit the various copying places when new to-be-copied fields are added. */
509 typedef struct address_item_propagated {
510 uschar *address_data; /* arbitrary data to keep with the address */
511 uschar *domain_data; /* from "domains" lookup */
512 uschar *localpart_data; /* from "local_parts" lookup */
513 uschar *errors_address; /* where to send errors (NULL => sender) */
514 header_line *extra_headers; /* additional headers */
515 uschar *remove_headers; /* list of those to remove */
516 void *variables; /* router-vasriables */
518 #ifdef EXPERIMENTAL_SRS_ALT
519 uschar *srs_sender; /* Change return path when delivering */
521 BOOL ignore_error:1; /* ignore delivery error */
523 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
524 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
525 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
527 } address_item_propagated;
530 /* The main address structure. Note that fields that are to be copied to
531 generated addresses should be put in the address_item_propagated structure (see
532 above) rather than directly into the address_item structure. */
534 typedef struct address_item {
535 struct address_item *next; /* for chaining addresses */
536 struct address_item *parent; /* parent address */
537 struct address_item *first; /* points to first after group delivery */
538 struct address_item *dupof; /* points to address this is a duplicate of */
540 router_instance *start_router; /* generated address starts here */
541 router_instance *router; /* the router that routed */
542 transport_instance *transport; /* the transport to use */
544 host_item *host_list; /* host data for the transport */
545 host_item *host_used; /* host that took delivery or failed hard */
546 host_item *fallback_hosts; /* to try if delivery defers */
548 reply_item *reply; /* data for autoreply */
549 retry_item *retries; /* chain of retry information */
551 uschar *address; /* address being delivered or routed */
552 uschar *unique; /* used for disambiguating */
553 uschar *cc_local_part; /* caseful local part */
554 uschar *lc_local_part; /* lowercased local part */
555 uschar *local_part; /* points to cc or lc version */
556 uschar *prefix; /* stripped prefix of local part */
557 uschar *prefix_v; /* variable part of above */
558 uschar *suffix; /* stripped suffix of local part */
559 uschar *suffix_v; /* variable part of above */
560 const uschar *domain; /* working domain (lower cased) */
562 uschar *address_retry_key; /* retry key including full address */
563 uschar *domain_retry_key; /* retry key for domain only */
565 uschar *current_dir; /* current directory for transporting */
566 uschar *home_dir; /* home directory for transporting */
567 uschar *message; /* error message */
568 uschar *user_message; /* error message that can be sent over SMTP
569 or quoted in bounce message */
570 uschar *onetime_parent; /* saved original parent for onetime */
571 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
572 uschar *return_filename; /* name of return file */
573 uschar *self_hostname; /* after self=pass */
574 uschar *shadow_message; /* info about shadow transporting */
577 const uschar *tlsver; /* version used for transport */
578 uschar *cipher; /* Cipher used for transport */
579 void *ourcert; /* Certificate offered to peer, binary */
580 void *peercert; /* Certificate from peer, binary */
581 uschar *peerdn; /* DN of server's certificate */
582 int ocsp; /* OCSP status of peer cert */
585 #ifdef EXPERIMENTAL_DSN_INFO
586 const uschar *smtp_greeting; /* peer self-identification */
587 const uschar *helo_response; /* peer message */
590 uschar *authenticator; /* auth driver name used by transport */
591 uschar *auth_id; /* auth "login" name used by transport */
592 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
594 uschar *dsn_orcpt; /* DSN orcpt value */
595 int dsn_flags; /* DSN flags */
596 int dsn_aware; /* DSN aware flag */
598 uid_t uid; /* uid for transporting */
599 gid_t gid; /* gid for transporting */
603 BOOL af_allow_file:1; /* allow file in generated address */
604 BOOL af_allow_pipe:1; /* allow pipe in generated address */
605 BOOL af_allow_reply:1; /* allow autoreply in generated address */
606 BOOL af_dr_retry_exists:1; /* router retry record exists */
607 BOOL af_expand_pipe:1; /* expand pipe arguments */
608 BOOL af_file:1; /* file delivery; always with pfr */
609 BOOL af_gid_set:1; /* gid field is set */
610 BOOL af_home_expanded:1; /* home_dir is already expanded */
611 BOOL af_initgroups:1; /* use initgroups() for local transporting */
612 BOOL af_local_host_removed:1; /* local host was backup */
613 BOOL af_lt_retry_exists:1; /* local transport retry exists */
614 BOOL af_pfr:1; /* pipe or file or reply delivery */
615 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
616 BOOL af_retry_timedout:1; /* true if retry timed out */
617 BOOL af_uid_set:1; /* uid field is set */
618 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
619 BOOL af_sverify_told:1; /* sender verify failure notified */
620 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
621 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
622 BOOL af_homonym:1; /* an ancestor has same address */
623 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
624 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
625 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
626 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
627 BOOL af_pass_message:1; /* pass message in bounces */
628 BOOL af_bad_reply:1; /* filter could not generate autoreply */
629 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
630 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
631 BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
632 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
633 #ifndef DISABLE_PIPE_CONNECT
634 BOOL af_early_pipe:1; /* delivery used connect-time pipelining */
637 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
639 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
640 BOOL af_force_command:1; /* force_command in pipe transport */
642 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
645 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
647 #ifndef DISABLE_TLS_RESUME
648 BOOL af_tls_resume:1; /* TLS used a resumed session */
652 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
653 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
654 int mode; /* mode for local transporting to a file */
655 int basic_errno; /* status after failure */
656 int more_errno; /* additional error information */
657 struct timeval delivery_time; /* time taken to do delivery/attempt */
659 unsigned short child_count; /* number of child addresses */
660 short int return_file; /* fileno of return data file */
661 short int special_action; /* ( used when when deferred or failed */
663 /* ( contains = or - when successful SMTP delivered */
665 /* ( contains verify rc in sender verify cache */
666 short int transport_return; /* result of delivery attempt */
667 address_item_propagated prop; /* fields that are propagated to children */
670 /* The table of header names consists of items of this type */
679 /* Chain of information about errors (e.g. bad addresses) */
681 typedef struct error_block {
682 struct error_block *next;
687 /* Chain of file names when processing the queue */
689 typedef struct queue_filename {
690 struct queue_filename *next;
695 /* Chain of items of retry information, read from the retry config. */
697 typedef struct retry_rule {
698 struct retry_rule *next;
705 typedef struct retry_config {
706 struct retry_config *next;
714 /* Structure for each node in a tree, of which there are various kinds */
716 typedef struct tree_node {
717 struct tree_node *left; /* pointer to left child */
718 struct tree_node *right; /* pointer to right child */
721 void *ptr; /* pointer to data */
722 int val; /* or integer data */
724 uschar balance; /* balancing factor */
725 uschar name[1]; /* node name - variable length */
728 /* Structure for holding time-limited data such as DNS returns.
729 We use this rather than extending tree_node to avoid wasting
730 space for most tree use (variables...) at the cost of complexity
731 for the lookups cache.
732 We also store any options used for the lookup. */
734 typedef struct expiring_data {
735 time_t expiry; /* if nonzero, data invalid after this time */
736 const uschar * opts; /* options, or NULL */
739 void * ptr; /* pointer to data */
740 int val; /* or integer data */
744 /* Structure for holding the handle and the cached last lookup for searches.
745 This block is pointed to by the tree entry for the file. The file can get
746 closed if too many are opened at once. There is a LRU chain for deciding which
749 typedef struct search_cache {
750 void *handle; /* lookup handle, or NULL if closed */
751 int search_type; /* search type */
752 tree_node *up; /* LRU up pointer */
753 tree_node *down; /* LRU down pointer */
754 tree_node *item_cache; /* tree of cached results */
757 /* Structure for holding a partially decoded DNS record; the name has been
758 uncompressed, but the data pointer is into the raw data. */
761 uschar name[DNS_MAXNAME]; /* domain name */
762 int type; /* record type */
763 unsigned short ttl; /* time-to-live, seconds */
764 int size; /* size of data */
765 const uschar *data; /* pointer to data */
768 /* Structure for holding the result of a DNS query. A touch over
769 64k big, so take care to release as soon as possible. */
772 int answerlen; /* length of the answer */
773 uschar answer[NS_MAXMSG]; /* the answer itself */
776 /* Structure for holding the intermediate data while scanning a DNS answer
780 int rrcount; /* count of RRs in the answer */
781 const uschar *aptr; /* pointer in the answer while scanning */
782 dns_record srr; /* data from current record in scan */
785 /* Structure for holding a chain of IP addresses that are extracted from
786 an A, AAAA, or A6 record. For the first two, there is only ever one address,
787 but the chaining feature of A6 allows for several addresses to be realized from
788 a single initial A6 record. The structure defines the address field of length
789 1. In use, a suitable sized block is obtained to hold the complete textual
792 typedef struct dns_address {
793 struct dns_address *next;
797 /* Structure used for holding intermediate data during MD5 computations. */
801 unsigned int abcd[4];
805 /* Structure used for holding intermediate data during SHA-1 computations. */
807 typedef struct sha1 {
812 /* Information for making an smtp connection */
814 transport_instance * tblock;
815 void * ob; /* smtp_transport_options_block * */
821 BOOL dane:1; /* connection must do dane */
822 dns_answer tlsa_dnsa; /* strictly, this should use tainted mem */
826 /* A client-initiated connection. If TLS, the second element is non-NULL */
833 /* Structure used to hold incoming packets of SMTP responses for a specific
834 socket. The packets which may contain multiple lines (and in some cases,
835 multiple responses). */
837 typedef struct smtp_inblock {
838 client_conn_ctx * cctx; /* the connection */
839 int buffersize; /* the size of the buffer */
840 uschar *ptr; /* current position in the buffer */
841 uschar *ptrend; /* end of data in the buffer */
842 uschar *buffer; /* the buffer itself */
845 /* Structure used to hold buffered outgoing packets of SMTP commands for a
846 specific socket. The packets which may contain multiple lines when pipelining
849 typedef struct smtp_outblock {
850 client_conn_ctx * cctx; /* the connection */
851 int cmd_count; /* count of buffered commands */
852 int buffersize; /* the size of the buffer */
853 BOOL authenticating; /* TRUE when authenticating */
854 uschar *ptr; /* current position in the buffer */
855 uschar *buffer; /* the buffer itself */
857 smtp_connect_args * conn_args; /* to make connection, if not yet made */
860 /* Structure to hold information about the source of redirection information */
862 typedef struct redirect_block {
863 uschar *string; /* file name or string */
864 uid_t *owners; /* allowed file owners */
865 gid_t *owngroups; /* allowed file groups */
866 struct passwd *pw; /* possible owner if not NULL */
867 int modemask; /* forbidden bits */
868 BOOL isfile; /* TRUE if string is a file name */
869 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
870 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
873 /* Structure for passing arguments to check_host() */
875 typedef struct check_host_block {
876 const uschar *host_name;
877 const uschar *host_address;
878 const uschar *host_ipv4;
882 /* Structure for remembering lookup data when caching the result of
883 a lookup in a named list. */
885 typedef struct namedlist_cacheblock {
886 struct namedlist_cacheblock *next;
889 } namedlist_cacheblock;
891 /* Structure for holding data for an entry in a named list */
893 typedef struct namedlist_block {
894 const uschar *string; /* the list string */
895 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
896 short number; /* the number of the list for caching */
897 BOOL hide; /* -bP does not display value */
900 /* Structures for Access Control Lists */
902 typedef struct acl_condition_block {
903 struct acl_condition_block * next;
910 } acl_condition_block;
912 typedef struct acl_block {
913 struct acl_block * next;
914 acl_condition_block * condition;
917 const uschar * srcfile;
920 /* smtp transport calc outbound_ip */
921 typedef BOOL (*oicf) (uschar *message_id, void *data);
923 /* DKIM information for transport */
926 uschar *dkim_identity;
927 uschar *dkim_private_key;
928 uschar *dkim_selector;
930 uschar *dkim_sign_headers;
933 uschar *dkim_timestamps;
936 #ifdef EXPERIMENTAL_ARC
937 uschar *arc_signspec;
941 /* End of structs.h */