1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* Definitions of various structures. In addition, those that are visible for
10 the compilation of local_scan() are defined in local_scan.h. These are
16 For those declared here, we have to pre-declare some because of mutually
17 recursive definitions in the auths, routers, and transports blocks. */
25 struct transport_info;
28 /* Structure for remembering macros for the configuration file */
30 typedef struct macro_item {
31 struct macro_item * next;
36 const uschar * replacement;
39 /* Structure for bit tables for debugging and logging */
41 typedef struct bit_table {
46 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
48 typedef struct ugid_block {
56 typedef enum { CHUNKING_NOT_OFFERED = -1,
59 CHUNKING_LAST} chunking_state_t;
61 /* Structure for holding information about a host for use mainly by routers,
62 but also used when checking lists of hosts and when transporting. Looking up
63 host addresses is done using this structure. */
65 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
67 typedef struct host_item {
68 struct host_item *next;
69 const uschar *name; /* Host name */
70 const uschar *address; /* IP address in text form */
71 int port; /* port value in host order (if SRV lookup) */
72 int mx; /* MX value if found via MX records */
73 int sort_key; /* MX*1000 plus random "fraction" */
74 int status; /* Usable, unusable, or unknown */
75 int why; /* Why host is unusable */
76 int last_try; /* Time of last try if known */
77 dnssec_status_t dnssec;
80 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
81 rewrite_headers field of a transport. */
83 typedef struct rewrite_rule {
84 struct rewrite_rule *next;
90 /* This structure is used to pass back configuration data from the smtp
91 transport to the outside world. It is used during callback processing. If ever
92 another remote transport were implemented, it could use the same structure. */
94 typedef struct transport_feedback {
101 BOOL hosts_randomize;
105 } transport_feedback;
107 /* Routers, transports, and authenticators have similar data blocks. Each
108 driver that is compiled into the code is represented by a xxx_info block; the
109 active drivers are represented by a chain of xxx_instance blocks. To make it
110 possible to use the same code for reading the configuration files for all
111 three, the layout of the start of the blocks is kept the same, and represented
112 by the generic structures driver_info and driver_instance. */
114 typedef struct driver_instance {
115 struct driver_instance *next;
116 uschar *name; /* Instance name */
117 struct driver_info *info; /* Points to info for this driver */
118 void *options_block; /* Pointer to private options */
119 uschar *driver_name; /* All start with this generic option */
122 typedef struct driver_info {
123 uschar *driver_name; /* Name of driver */
124 optionlist *options; /* Table of private options names */
125 int *options_count; /* -> Number of entries in table */
126 void *options_block; /* Points to default private block */
127 int options_len; /* Length of same in bytes */
128 void (*init)( /* Initialization entry point */
129 struct driver_instance *);
133 /* Structure for holding information about the configured transports. Some
134 of the generally accessible options are set from the configuration file; others
135 are set by transport initialization, since they can only be set for certain
136 transports. They need to be generally accessible, however, as they are used by
137 the main transport code. */
139 typedef struct transport_instance {
140 struct transport_instance *next;
141 uschar *name; /* Instance name */
142 struct transport_info *info; /* Info for this driver */
143 void *options_block; /* Pointer to private options */
144 uschar *driver_name; /* Must be first */
145 int (*setup)( /* Setup entry point */
146 struct transport_instance *,
147 struct address_item *,
148 struct transport_feedback *, /* For passing back config data */
149 uid_t, /* The uid that will be used */
150 gid_t, /* The gid that will be used */
151 uschar **); /* For an error message */
152 /**************************************/
153 int batch_max; /* ) */
154 uschar *batch_id; /* ) */
155 uschar *home_dir; /* ) Used only for local transports */
156 uschar *current_dir; /* ) */
157 /**************************************/
158 uschar *expand_multi_domain; /* ) */
159 BOOL multi_domain; /* ) */
160 BOOL overrides_hosts; /* ) Used only for remote transports */
161 int max_addresses; /* ) */
162 int connection_max_messages;/* ) */
163 /**************************************/
164 BOOL deliver_as_creator; /* Used only by pipe at present */
165 BOOL disable_logging; /* For very weird requirements */
166 BOOL initgroups; /* Initialize groups when setting uid */
167 BOOL uid_set; /* uid is set */
168 BOOL gid_set; /* gid is set */
171 uschar *expand_uid; /* Variable uid */
172 uschar *expand_gid; /* Variable gid */
173 uschar *warn_message; /* Used only by appendfile at present */
174 uschar *shadow; /* Name of shadow transport */
175 uschar *shadow_condition; /* Condition for running it */
176 uschar *filter_command; /* For on-the-fly-filtering */
177 uschar *add_headers; /* Add these headers */
178 uschar *remove_headers; /* Remove these headers */
179 uschar *return_path; /* Overriding (rewriting) return path */
180 uschar *debug_string; /* Debugging output */
181 uschar *max_parallel; /* Number of concurrent instances */
182 uschar *message_size_limit; /* Biggest message this transport handles */
183 uschar *headers_rewrite; /* Rules for rewriting headers */
184 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
185 int rewrite_existflags; /* Bits showing which headers are rewritten */
186 int filter_timeout; /* For transport filter timing */
187 BOOL body_only; /* Deliver only the body */
188 BOOL delivery_date_add; /* Add Delivery-Date header */
189 BOOL envelope_to_add; /* Add Envelope-To header */
190 BOOL headers_only; /* Deliver only the headers */
191 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
192 BOOL return_path_add; /* Add Return-Path header */
193 BOOL return_output; /* TRUE if output should always be returned */
194 BOOL return_fail_output; /* ditto, but only on failure */
195 BOOL log_output; /* Similarly for logging */
196 BOOL log_fail_output;
197 BOOL log_defer_output;
198 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
199 #ifndef DISABLE_EVENT
200 uschar *event_action; /* String to expand on notable events */
202 } transport_instance;
205 /* Structure for holding information about a type of transport. The first six
206 fields must match driver_info above. */
208 typedef struct transport_info {
209 uschar *driver_name; /* Driver name */
210 optionlist *options; /* Table of private options names */
211 int *options_count; /* -> Number of entries in table */
212 void *options_block; /* Points to default private block */
213 int options_len; /* Length of same in bytes */
214 void (*init)( /* Initialization function */
215 struct transport_instance *);
217 BOOL (*code)( /* Main entry point */
218 transport_instance *,
219 struct address_item *);
220 void (*tidyup)( /* Tidyup function */
221 struct transport_instance *);
222 void (*closedown)( /* For closing down a passed channel */
223 struct transport_instance *);
224 BOOL local; /* TRUE for local transports */
228 /* smtp transport datachunk callback */
230 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
231 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
233 struct transport_context;
234 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
236 /* Structure for information about a delivery-in-progress */
238 typedef struct transport_context {
239 union { /* discriminated by option topt_output_string */
240 int fd; /* file descriptor to write message to */
241 uschar * msg; /* allocated string with written message */
243 transport_instance * tblock; /* transport */
244 struct address_item * addr;
245 uschar * check_string; /* string replacement */
246 uschar * escape_string;
247 int options; /* output processing topt_* */
249 /* items below only used with option topt_use_bdat */
250 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
253 /* items below only used with option topt_output_string */
265 /* Structure for holding information about the configured routers. */
267 typedef struct router_instance {
268 struct router_instance *next;
270 struct router_info *info;
271 void *options_block; /* Pointer to private options */
272 uschar *driver_name; /* Must be first */
274 uschar *address_data; /* Arbitrary data */
275 #ifdef EXPERIMENTAL_BRIGHTMAIL
276 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
278 uschar *cannot_route_message; /* Used when routing fails */
279 uschar *condition; /* General condition */
280 uschar *current_directory; /* For use during delivery */
281 uschar *debug_string; /* Debugging output */
282 uschar *domains; /* Specific domains */
283 uschar *errors_to; /* Errors address */
284 uschar *expand_gid; /* Expanded gid string */
285 uschar *expand_uid; /* Expanded uid string */
286 uschar *expand_more; /* Expanded more string */
287 uschar *expand_unseen; /* Expanded unseen string */
288 uschar *extra_headers; /* Additional headers */
289 uschar *fallback_hosts; /* For remote transports (text list) */
290 uschar *home_directory; /* For use during delivery */
291 uschar *ignore_target_hosts; /* Target hosts to ignore */
292 uschar *local_parts; /* Specific local parts */
293 uschar *pass_router_name; /* Router for passed address */
294 uschar *prefix; /* Address prefix */
295 uschar *redirect_router_name; /* Router for generated address */
296 uschar *remove_headers; /* Removed headers */
297 uschar *require_files; /* File checks before router is run */
298 uschar *router_home_directory; /* For use while routing */
299 uschar *self; /* Text option for handling self reference */
300 uschar *senders; /* Specific senders */
301 uschar *suffix; /* Address suffix */
302 uschar *translate_ip_address; /* IP address translation fudgery */
303 uschar *transport_name; /* Transport name */
305 BOOL address_test; /* Use this router when testing addresses */
306 #ifdef EXPERIMENTAL_BRIGHTMAIL
307 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
308 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
309 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
311 BOOL expn; /* Use this router when processing EXPN */
312 BOOL caseful_local_part; /* TRUE => don't lowercase */
313 BOOL check_local_user; /* TRUE => check local user */
314 BOOL disable_logging; /* For very weird requirements */
315 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
316 BOOL fail_verify_sender; /* Fail verify if sender match this router */
317 BOOL gid_set; /* Flag to indicate gid is set */
318 BOOL initgroups; /* TRUE if initgroups is required */
319 BOOL log_as_local; /* TRUE logs as a local delivery */
320 BOOL more; /* If FALSE, do no more if this one fails */
321 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
322 BOOL prefix_optional; /* Just what it says */
323 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
324 BOOL retry_use_local_part; /* Just what it says */
325 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
326 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
327 BOOL suffix_optional; /* As it says */
328 BOOL verify_only; /* Skip this router if not verifying */
329 BOOL verify_recipient; /* Use this router when verifying a recipient*/
330 BOOL verify_sender; /* Use this router when verifying a sender */
331 BOOL uid_set; /* Flag to indicate uid is set */
332 BOOL unseen; /* If TRUE carry on, even after success */
333 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
335 int self_code; /* Encoded version of "self" */
336 uid_t uid; /* Fixed uid value */
337 gid_t gid; /* Fixed gid value */
339 host_item *fallback_hostlist; /* For remote transport (block chain) */
340 transport_instance *transport; /* Transport block (when found) */
341 struct router_instance *pass_router; /* Actual router for passed address */
342 struct router_instance *redirect_router; /* Actual router for generated address */
344 dnssec_domains dnssec;
348 /* Structure for holding information about a type of router. The first six
349 fields must match driver_info above. */
351 typedef struct router_info {
353 optionlist *options; /* Table of private options names */
354 int *options_count; /* -> Number of entries in table */
355 void *options_block; /* Points to default private block */
356 int options_len; /* Length of same in bytes */
357 void (*init)( /* Initialization function */
358 struct router_instance *);
360 int (*code)( /* Main entry point */
362 struct address_item *,
365 struct address_item **,
366 struct address_item **,
367 struct address_item **,
368 struct address_item **);
369 void (*tidyup)( /* Tidyup function */
370 struct router_instance *);
371 int ri_flags; /* Descriptive flags */
375 /* Structure for holding information about a lookup type. */
377 #include "lookupapi.h"
380 /* Structure for holding information about the configured authentication
383 typedef struct auth_instance {
384 struct auth_instance *next;
385 uschar *name; /* Exim instance name */
386 struct auth_info *info; /* Pointer to driver info block */
387 void *options_block; /* Pointer to private options */
388 uschar *driver_name; /* Must be first */
389 uschar *advertise_condition; /* Are we going to advertise this?*/
390 uschar *client_condition; /* Should the client try this? */
391 uschar *public_name; /* Advertised name */
392 uschar *set_id; /* String to set when server as authenticated id */
393 uschar *set_client_id; /* String to set when client as client_authenticated id */
394 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
395 uschar *server_debug_string; /* Debugging output */
396 uschar *server_condition; /* Authorization condition */
397 BOOL client; /* TRUE if client option(s) set */
398 BOOL server; /* TRUE if server options(s) set */
399 BOOL advertised; /* Set TRUE when advertised */
403 /* Structure for holding information about an authentication mechanism. The
404 first six fields must match driver_info above. */
406 typedef struct auth_info {
407 uschar *driver_name; /* e.g. "condition" */
408 optionlist *options; /* Table of private options names */
409 int *options_count; /* -> Number of entries in table */
410 void *options_block; /* Points to default private block */
411 int options_len; /* Length of same in bytes */
412 void (*init)( /* initialization function */
413 struct auth_instance *);
415 int (*servercode)( /* server function */
416 auth_instance *, /* the instance data */
417 uschar *); /* rest of AUTH command */
418 int (*clientcode)( /* client function */
419 struct auth_instance *,
420 struct smtp_inblock *, /* socket and input buffer */
421 struct smtp_outblock *, /* socket and output buffer */
422 int, /* command timeout */
423 uschar *, /* buffer for reading response */
424 int); /* sizeof buffer */
425 void (*version_report)( /* diagnostic version reporting */
426 FILE *); /* I/O stream to print to */
430 /* Structure for holding a single IP address and port; used for the chain of
431 addresses and ports for the local host. Make the char string large enough to
432 hold an IPv6 address. */
434 typedef struct ip_address_item {
435 struct ip_address_item *next;
437 BOOL v6_include_v4; /* Used in the daemon */
441 /* Structure for chaining together arbitrary strings. */
443 typedef struct string_item {
444 struct string_item *next;
448 /* Information about a soft delivery failure, for use when calculating
449 retry information. It's separate from the address block, because there
450 can be a chain of them for SMTP deliveries where multiple IP addresses
453 typedef struct retry_item {
454 struct retry_item *next; /* for chaining */
455 uschar *key; /* string identifying host/address/message */
456 int basic_errno; /* error code for this destination */
457 int more_errno; /* additional error information */
458 uschar *message; /* local error message */
459 int flags; /* see below */
462 /* Retry data flags */
464 #define rf_delete 0x0001 /* retry info is to be deleted */
465 #define rf_host 0x0002 /* retry info is for a remote host */
466 #define rf_message 0x0004 /* retry info is for a host+message */
468 /* Information about a constructed message that is to be sent using the
469 autoreply transport. This is pointed to from the address block. */
471 typedef struct reply_item {
472 uschar *from; /* ) */
473 uschar *reply_to; /* ) */
475 uschar *cc; /* ) specific header fields */
477 uschar *subject; /* ) */
478 uschar *headers; /* misc other headers, concatenated */
479 uschar *text; /* text string body */
480 uschar *file; /* file body */
481 BOOL file_expand; /* expand the body */
482 int expand_forbid; /* expansion lockout flags */
483 uschar *logfile; /* file to keep a log in */
484 uschar *oncelog; /* file to keep records in for once only */
485 time_t once_repeat; /* time to repeat "once only" */
486 BOOL return_message; /* send back the original message */
490 /* The address_item structure contains many fields which are used at various
491 times while delivering a message. Some are used only for remote deliveries;
492 some only for local. A particular set of fields is copied whenever a child
493 address is created. For convenience, we keep those fields in a separate
494 sub-structure so they can be copied in one go. This also means I won't forget
495 to edit the various copying places when new to-be-copied fields are added. */
497 typedef struct address_item_propagated {
498 uschar *address_data; /* arbitrary data to keep with the address */
499 uschar *domain_data; /* from "domains" lookup */
500 uschar *localpart_data; /* from "local_parts" lookup */
501 uschar *errors_address; /* where to send errors (NULL => sender) */
502 header_line *extra_headers; /* additional headers */
503 uschar *remove_headers; /* list of those to remove */
505 #ifdef EXPERIMENTAL_SRS
506 uschar *srs_sender; /* Change return path when delivering */
509 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
510 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
511 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
513 } address_item_propagated;
515 /* Bits for the flags field below */
517 #define af_allow_file 0x00000001 /* allow file in generated address */
518 #define af_allow_pipe 0x00000002 /* allow pipe in generated address */
519 #define af_allow_reply 0x00000004 /* allow autoreply in generated address */
520 #define af_dr_retry_exists 0x00000008 /* router retry record exists */
521 #define af_expand_pipe 0x00000010 /* expand pipe arguments */
522 #define af_file 0x00000020 /* file delivery; always with pfr */
523 #define af_gid_set 0x00000040 /* gid field is set */
524 #define af_home_expanded 0x00000080 /* home_dir is already expanded */
525 #define af_ignore_error 0x00000100 /* ignore delivery error */
526 #define af_initgroups 0x00000200 /* use initgroups() for local transporting */
527 #define af_local_host_removed 0x00000400 /* local host was backup */
528 #define af_lt_retry_exists 0x00000800 /* local transport retry exists */
529 #define af_pfr 0x00001000 /* pipe or file or reply delivery */
530 #define af_retry_skipped 0x00002000 /* true if retry caused some skipping */
531 #define af_retry_timedout 0x00004000 /* true if retry timed out */
532 #define af_uid_set 0x00008000 /* uid field is set */
533 #define af_hide_child 0x00010000 /* hide child in bounce/defer msgs */
534 #define af_sverify_told 0x00020000 /* sender verify failure notified */
535 #define af_verify_pmfail 0x00040000 /* verify failure was postmaster callout */
536 #define af_verify_nsfail 0x00080000 /* verify failure was null sender callout */
537 #define af_homonym 0x00100000 /* an ancestor has same address */
538 #define af_verify_routed 0x00200000 /* for cached sender verify: routed OK */
539 #define af_verify_callout 0x00400000 /* for cached sender verify: callout was specified */
540 #define af_include_affixes 0x00800000 /* delivered with affixes in RCPT */
541 #define af_cert_verified 0x01000000 /* delivered with verified TLS cert */
542 #define af_pass_message 0x02000000 /* pass message in bounces */
543 #define af_bad_reply 0x04000000 /* filter could not generate autoreply */
545 # define af_prdr_used 0x08000000 /* delivery used SMTP PRDR */
547 #define af_chunking_used 0x10000000 /* delivery used SMTP CHUNKING */
548 #define af_force_command 0x20000000 /* force_command in pipe transport */
549 #ifdef EXPERIMENTAL_DANE
550 # define af_dane_verified 0x40000000 /* TLS cert verify done with DANE */
553 # define af_utf8_downcvt 0x80000000 /* downconvert was done for delivery */
556 /* These flags must be propagated when a child is created */
558 #define af_propagate (af_ignore_error)
560 /* The main address structure. Note that fields that are to be copied to
561 generated addresses should be put in the address_item_propagated structure (see
562 above) rather than directly into the address_item structure. */
564 typedef struct address_item {
565 struct address_item *next; /* for chaining addresses */
566 struct address_item *parent; /* parent address */
567 struct address_item *first; /* points to first after group delivery */
568 struct address_item *dupof; /* points to address this is a duplicate of */
570 router_instance *start_router; /* generated address starts here */
571 router_instance *router; /* the router that routed */
572 transport_instance *transport; /* the transport to use */
574 host_item *host_list; /* host data for the transport */
575 host_item *host_used; /* host that took delivery or failed hard */
576 host_item *fallback_hosts; /* to try if delivery defers */
578 reply_item *reply; /* data for autoreply */
579 retry_item *retries; /* chain of retry information */
581 uschar *address; /* address being delivered or routed */
582 uschar *unique; /* used for disambiguating */
583 uschar *cc_local_part; /* caseful local part */
584 uschar *lc_local_part; /* lowercased local part */
585 uschar *local_part; /* points to cc or lc version */
586 uschar *prefix; /* stripped prefix of local part */
587 uschar *suffix; /* stripped suffix of local part */
588 const uschar *domain; /* working domain (lower cased) */
590 uschar *address_retry_key; /* retry key including full address */
591 uschar *domain_retry_key; /* retry key for domain only */
593 uschar *current_dir; /* current directory for transporting */
594 uschar *home_dir; /* home directory for transporting */
595 uschar *message; /* error message */
596 uschar *user_message; /* error message that can be sent over SMTP
597 or quoted in bounce message */
598 uschar *onetime_parent; /* saved original parent for onetime */
599 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
600 uschar *return_filename; /* name of return file */
601 uschar *self_hostname; /* after self=pass */
602 uschar *shadow_message; /* info about shadow transporting */
605 uschar *cipher; /* Cipher used for transport */
606 void *ourcert; /* Certificate offered to peer, binary */
607 void *peercert; /* Certificate from peer, binary */
608 uschar *peerdn; /* DN of server's certificate */
609 int ocsp; /* OCSP status of peer cert */
612 #ifdef EXPERIMENTAL_DSN_INFO
613 const uschar *smtp_greeting; /* peer self-identification */
614 const uschar *helo_response; /* peer message */
617 uschar *authenticator; /* auth driver name used by transport */
618 uschar *auth_id; /* auth "login" name used by transport */
619 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
621 uschar *dsn_orcpt; /* DSN orcpt value */
622 int dsn_flags; /* DSN flags */
623 int dsn_aware; /* DSN aware flag */
625 uid_t uid; /* uid for transporting */
626 gid_t gid; /* gid for transporting */
628 unsigned int flags; /* a row of bits, defined above */
629 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
630 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
631 int mode; /* mode for local transporting to a file */
632 int more_errno; /* additional error information */
633 /* (may need to hold a timestamp) */
634 unsigned int delivery_usec; /* subsecond part of delivery time */
636 short int basic_errno; /* status after failure */
637 unsigned short child_count; /* number of child addresses */
638 short int return_file; /* fileno of return data file */
639 short int special_action; /* ( used when when deferred or failed */
641 /* ( contains = or - when successful SMTP delivered */
643 /* ( contains verify rc in sender verify cache */
644 short int transport_return; /* result of delivery attempt */
645 address_item_propagated prop; /* fields that are propagated to children */
648 /* The table of header names consists of items of this type */
657 /* Chain of information about errors (e.g. bad addresses) */
659 typedef struct error_block {
660 struct error_block *next;
665 /* Chain of file names when processing the queue */
667 typedef struct queue_filename {
668 struct queue_filename *next;
673 /* Chain of items of retry information, read from the retry config. */
675 typedef struct retry_rule {
676 struct retry_rule *next;
683 typedef struct retry_config {
684 struct retry_config *next;
692 /* Structure for each node in a tree, of which there are various kinds */
694 typedef struct tree_node {
695 struct tree_node *left; /* pointer to left child */
696 struct tree_node *right; /* pointer to right child */
699 void *ptr; /* pointer to data */
700 int val; /* or integer data */
702 uschar balance; /* balancing factor */
703 uschar name[1]; /* node name - variable length */
706 /* Structure for holding time-limited data such as DNS returns.
707 We use this rather than extending tree_node to avoid wasting
708 space for most tree use (variables...) at the cost of complexity
709 for the lookups cache */
711 typedef struct expiring_data {
712 time_t expiry; /* if nonzero, data invalid after this time */
713 void *ptr; /* pointer to data */
716 /* Structure for holding the handle and the cached last lookup for searches.
717 This block is pointed to by the tree entry for the file. The file can get
718 closed if too many are opened at once. There is a LRU chain for deciding which
721 typedef struct search_cache {
722 void *handle; /* lookup handle, or NULL if closed */
723 int search_type; /* search type */
724 tree_node *up; /* LRU up pointer */
725 tree_node *down; /* LRU down pointer */
726 tree_node *item_cache; /* tree of cached results */
729 /* Structure for holding a partially decoded DNS record; the name has been
730 uncompressed, but the data pointer is into the raw data. */
733 uschar name[DNS_MAXNAME]; /* domain name */
734 int type; /* record type */
735 unsigned short ttl; /* time-to-live, seconds */
736 int size; /* size of data */
737 const uschar *data; /* pointer to data */
740 /* Structure for holding the result of a DNS query. */
743 int answerlen; /* length of the answer */
744 uschar answer[MAXPACKET]; /* the answer itself */
747 /* Structure for holding the intermediate data while scanning a DNS answer
751 int rrcount; /* count of RRs in the answer */
752 const uschar *aptr; /* pointer in the answer while scanning */
753 dns_record srr; /* data from current record in scan */
756 /* Structure for holding a chain of IP addresses that are extracted from
757 an A, AAAA, or A6 record. For the first two, there is only ever one address,
758 but the chaining feature of A6 allows for several addresses to be realized from
759 a single initial A6 record. The structure defines the address field of length
760 1. In use, a suitable sized block is obtained to hold the complete textual
763 typedef struct dns_address {
764 struct dns_address *next;
768 /* Structure used for holding intermediate data during MD5 computations. */
772 unsigned int abcd[4];
776 /* Structure used for holding intermediate data during SHA-1 computations. */
778 typedef struct sha1 {
784 /* Structure used to hold incoming packets of SMTP responses for a specific
785 socket. The packets which may contain multiple lines (and in some cases,
786 multiple responses). */
788 typedef struct smtp_inblock {
789 int sock; /* the socket */
790 int buffersize; /* the size of the buffer */
791 uschar *ptr; /* current position in the buffer */
792 uschar *ptrend; /* end of data in the buffer */
793 uschar *buffer; /* the buffer itself */
796 /* Structure used to hold buffered outgoing packets of SMTP commands for a
797 specific socket. The packets which may contain multiple lines when pipelining
800 typedef struct smtp_outblock {
801 int sock; /* the socket */
802 int cmd_count; /* count of buffered commands */
803 int buffersize; /* the size of the buffer */
804 BOOL authenticating; /* TRUE when authenticating */
805 uschar *ptr; /* current position in the buffer */
806 uschar *buffer; /* the buffer itself */
809 /* Structure to hold information about the source of redirection information */
811 typedef struct redirect_block {
812 uschar *string; /* file name or string */
813 uid_t *owners; /* allowed file owners */
814 gid_t *owngroups; /* allowed file groups */
815 struct passwd *pw; /* possible owner if not NULL */
816 int modemask; /* forbidden bits */
817 BOOL isfile; /* TRUE if string is a file name */
818 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
819 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
822 /* Structure for passing arguments to check_host() */
824 typedef struct check_host_block {
825 const uschar *host_name;
826 const uschar *host_address;
827 const uschar *host_ipv4;
831 /* Structure for remembering lookup data when caching the result of
832 a lookup in a named list. */
834 typedef struct namedlist_cacheblock {
835 struct namedlist_cacheblock *next;
838 } namedlist_cacheblock;
840 /* Structure for holding data for an entry in a named list */
842 typedef struct namedlist_block {
843 const uschar *string; /* the list string */
844 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
845 int number; /* the number of the list for caching */
848 /* Structures for Access Control Lists */
850 typedef struct acl_condition_block {
851 struct acl_condition_block *next;
858 } acl_condition_block;
860 typedef struct acl_block {
861 struct acl_block *next;
862 acl_condition_block *condition;
866 /* smtp transport calc outbound_ip */
867 typedef BOOL (*oicf) (uschar *message_id, void *data);
869 /* DKIM information for transport */
872 uschar *dkim_private_key;
873 uschar *dkim_selector;
875 uschar *dkim_sign_headers;
880 /* End of structs.h */