1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
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;
37 /* Structure for bit tables for debugging and logging */
39 typedef struct bit_table {
44 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
46 typedef struct ugid_block {
54 /* Structure for holding information about a host for use mainly by routers,
55 but also used when checking lists of hosts and when transporting. Looking up
56 host addresses is done using this structure. */
58 typedef struct host_item {
59 struct host_item *next;
60 uschar *name; /* Host name */
61 uschar *address; /* IP address in text form */
62 int port; /* port value in host order (if SRV lookup) */
63 int mx; /* MX value if found via MX records */
64 int sort_key; /* MX*1000 plus random "fraction" */
65 int status; /* Usable, unusable, or unknown */
66 int why; /* Why host is unusable */
67 int last_try; /* Time of last try if known */
70 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
71 rewrite_headers field of a transport. */
73 typedef struct rewrite_rule {
74 struct rewrite_rule *next;
80 /* This structure is used to pass back configuration data from the smtp
81 transport to the outside world. It is used during callback processing. If ever
82 another remote transport were implemented, it could use the same structure. */
84 typedef struct transport_feedback {
97 /* Routers, transports, and authenticators have similar data blocks. Each
98 driver that is compiled into the code is represented by a xxx_info block; the
99 active drivers are represented by a chain of xxx_instance blocks. To make it
100 possible to use the same code for reading the configuration files for all
101 three, the layout of the start of the blocks is kept the same, and represented
102 by the generic structures driver_info and driver_instance. */
104 typedef struct driver_instance {
105 struct driver_instance *next;
106 uschar *name; /* Instance name */
107 struct driver_info *info; /* Points to info for this driver */
108 void *options_block; /* Pointer to private options */
109 uschar *driver_name; /* All start with this generic option */
112 typedef struct driver_info {
113 uschar *driver_name; /* Name of driver */
114 optionlist *options; /* Table of private options names */
115 int *options_count; /* -> Number of entries in table */
116 void *options_block; /* Points to default private block */
117 int options_len; /* Length of same in bytes */
118 void (*init)( /* Initialization entry point */
119 struct driver_instance *);
123 /* Structure for holding information about the configured transports. Some
124 of the generally accessible options are set from the configuration file; others
125 are set by transport initialization, since they can only be set for certain
126 transports. They need to be generally accessible, however, as they are used by
127 the main transport code. */
129 typedef struct transport_instance {
130 struct transport_instance *next;
131 uschar *name; /* Instance name */
132 struct transport_info *info; /* Info for this driver */
133 void *options_block; /* Pointer to private options */
134 uschar *driver_name; /* Must be first */
135 int (*setup)( /* Setup entry point */
136 struct transport_instance *,
137 struct address_item *,
138 struct transport_feedback *, /* For passing back config data */
139 uid_t, /* The uid that will be used */
140 gid_t, /* The gid that will be used */
141 uschar **); /* For an error message */
142 /**************************************/
143 int batch_max; /* ) */
144 uschar *batch_id; /* ) */
145 uschar *home_dir; /* ) Used only for local transports */
146 uschar *current_dir; /* ) */
147 /**************************************/
148 BOOL multi_domain; /* ) */
149 BOOL overrides_hosts; /* ) Used only for remote transports */
150 int max_addresses; /* ) */
151 int connection_max_messages;/* ) */
152 /**************************************/
153 BOOL deliver_as_creator; /* Used only by pipe at present */
154 BOOL disable_logging; /* For very weird requirements */
155 BOOL initgroups; /* Initialize groups when setting uid */
156 BOOL uid_set; /* uid is set */
157 BOOL gid_set; /* gid is set */
160 uschar *expand_uid; /* Variable uid */
161 uschar *expand_gid; /* Variable gid */
162 uschar *warn_message; /* Used only by appendfile at present */
163 uschar *shadow; /* Name of shadow transport */
164 uschar *shadow_condition; /* Condition for running it */
165 uschar *filter_command; /* For on-the-fly-filtering */
166 uschar *add_headers; /* Add these headers */
167 uschar *remove_headers; /* Remove these headers */
168 uschar *return_path; /* Overriding (rewriting) return path */
169 uschar *debug_string; /* Debugging output */
170 uschar *message_size_limit; /* Biggest message this transport handles */
171 uschar *headers_rewrite; /* Rules for rewriting headers */
172 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
173 int rewrite_existflags; /* Bits showing which headers are rewritten */
174 int filter_timeout; /* For transport filter timing */
175 BOOL body_only; /* Deliver only the body */
176 BOOL delivery_date_add; /* Add Delivery-Date header */
177 BOOL envelope_to_add; /* Add Envelope-To header */
178 BOOL headers_only; /* Deliver only the headers */
179 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
180 BOOL return_path_add; /* Add Return-Path header */
181 BOOL return_output; /* TRUE if output should always be returned */
182 BOOL return_fail_output; /* ditto, but only on failure */
183 BOOL log_output; /* Similarly for logging */
184 BOOL log_fail_output;
185 BOOL log_defer_output;
186 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
187 } transport_instance;
190 /* Structure for holding information about a type of transport. The first six
191 fields must match driver_info above. */
193 typedef struct transport_info {
194 uschar *driver_name; /* Driver name */
195 optionlist *options; /* Table of private options names */
196 int *options_count; /* -> Number of entries in table */
197 void *options_block; /* Points to default private block */
198 int options_len; /* Length of same in bytes */
199 void (*init)( /* Initialization function */
200 struct transport_instance *);
202 BOOL (*code)( /* Main entry point */
203 transport_instance *,
204 struct address_item *);
205 void (*tidyup)( /* Tidyup function */
206 struct transport_instance *);
207 void (*closedown)( /* For closing down a passed channel */
208 struct transport_instance *);
209 BOOL local; /* TRUE for local transports */
214 /* Structure for holding information about the configured routers. */
216 typedef struct router_instance {
217 struct router_instance *next;
219 struct router_info *info;
220 void *options_block; /* Pointer to private options */
221 uschar *driver_name; /* Must be first */
223 uschar *address_data; /* Arbitrary data */
224 #ifdef EXPERIMENTAL_BRIGHTMAIL
225 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
227 uschar *cannot_route_message; /* Used when routing fails */
228 uschar *condition; /* General condition */
229 uschar *current_directory; /* For use during delivery */
230 uschar *debug_string; /* Debugging output */
231 uschar *domains; /* Specific domains */
232 uschar *errors_to; /* Errors address */
233 uschar *expand_gid; /* Expanded gid string */
234 uschar *expand_uid; /* Expanded uid string */
235 uschar *expand_more; /* Expanded more string */
236 uschar *expand_unseen; /* Expanded unseen string */
237 uschar *extra_headers; /* Additional headers */
238 uschar *fallback_hosts; /* For remote transports (text list) */
239 uschar *home_directory; /* For use during delivery */
240 uschar *ignore_target_hosts; /* Target hosts to ignore */
241 uschar *local_parts; /* Specific local parts */
242 uschar *pass_router_name; /* Router for passed address */
243 uschar *prefix; /* Address prefix */
244 uschar *redirect_router_name; /* Router for generated address */
245 uschar *remove_headers; /* Removed headers */
246 uschar *require_files; /* File checks before router is run */
247 uschar *router_home_directory; /* For use while routing */
248 uschar *self; /* Text option for handling self reference */
249 uschar *senders; /* Specific senders */
250 uschar *suffix; /* Address suffix */
251 uschar *translate_ip_address; /* IP address translation fudgery */
252 uschar *transport_name; /* Transport name */
254 BOOL address_test; /* Use this router when testing addresses */
255 #ifdef EXPERIMENTAL_BRIGHTMAIL
256 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
257 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
258 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
260 BOOL expn; /* Use this router when processing EXPN */
261 BOOL caseful_local_part; /* TRUE => don't lowercase */
262 BOOL check_local_user; /* TRUE => check local user */
263 BOOL disable_logging; /* For very weird requirements */
264 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
265 BOOL fail_verify_sender; /* Fail verify if sender match this router */
266 BOOL gid_set; /* Flag to indicate gid is set */
267 BOOL initgroups; /* TRUE if initgroups is required */
268 BOOL log_as_local; /* TRUE logs as a local delivery */
269 BOOL more; /* If FALSE, do no more if this one fails */
270 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
271 BOOL prefix_optional; /* Just what it says */
272 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
273 BOOL retry_use_local_part; /* Just what it says */
274 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
275 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
276 BOOL suffix_optional; /* As it says */
277 BOOL verify_only; /* Skip this router if not verifying */
278 BOOL verify_recipient; /* Use this router when verifying a recipient*/
279 BOOL verify_sender; /* Use this router when verifying a sender */
280 BOOL uid_set; /* Flag to indicate uid is set */
281 BOOL unseen; /* If TRUE carry on, even after success */
283 int self_code; /* Encoded version of "self" */
284 uid_t uid; /* Fixed uid value */
285 gid_t gid; /* Fixed gid value */
287 host_item *fallback_hostlist; /* For remote transport (block chain) */
288 transport_instance *transport; /* Transport block (when found) */
289 struct router_instance *pass_router; /* Actual router for passed address */
290 struct router_instance *redirect_router; /* Actual router for generated address */
294 /* Structure for holding information about a type of router. The first six
295 fields must match driver_info above. */
297 typedef struct router_info {
299 optionlist *options; /* Table of private options names */
300 int *options_count; /* -> Number of entries in table */
301 void *options_block; /* Points to default private block */
302 int options_len; /* Length of same in bytes */
303 void (*init)( /* Initialization function */
304 struct router_instance *);
306 int (*code)( /* Main entry point */
308 struct address_item *,
311 struct address_item **,
312 struct address_item **,
313 struct address_item **,
314 struct address_item **);
315 void (*tidyup)( /* Tidyup function */
316 struct router_instance *);
317 int ri_flags; /* Descriptive flags */
321 /* Structure for holding information about a lookup type. */
323 #include "lookupapi.h"
326 /* Structure for holding information about the configured authentication
329 typedef struct auth_instance {
330 struct auth_instance *next;
331 uschar *name; /* Exim instance name */
332 struct auth_info *info; /* Pointer to driver info block */
333 void *options_block; /* Pointer to private options */
334 uschar *driver_name; /* Must be first */
335 uschar *advertise_condition; /* Are we going to advertise this?*/
336 uschar *client_condition; /* Should the client try this? */
337 uschar *public_name; /* Advertised name */
338 uschar *set_id; /* String to set when server as authenticated id */
339 uschar *set_client_id; /* String to set when client as client_authenticated id */
340 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
341 uschar *server_debug_string; /* Debugging output */
342 uschar *server_condition; /* Authorization condition */
343 BOOL client; /* TRUE if client option(s) set */
344 BOOL server; /* TRUE if server options(s) set */
345 BOOL advertised; /* Set TRUE when advertised */
349 /* Structure for holding information about an authentication mechanism. The
350 first six fields must match driver_info above. */
352 typedef struct auth_info {
353 uschar *driver_name; /* e.g. "condition" */
354 optionlist *options; /* Table of private options names */
355 int *options_count; /* -> Number of entries in table */
356 void *options_block; /* Points to default private block */
357 int options_len; /* Length of same in bytes */
358 void (*init)( /* initialization function */
359 struct auth_instance *);
361 int (*servercode)( /* server function */
362 auth_instance *, /* the instance data */
363 uschar *); /* rest of AUTH command */
364 int (*clientcode)( /* client function */
365 struct auth_instance *,
366 struct smtp_inblock *, /* socket and input buffer */
367 struct smtp_outblock *, /* socket and output buffer */
368 int, /* command timeout */
369 uschar *, /* buffer for reading response */
370 int); /* sizeof buffer */
371 void (*version_report)( /* diagnostic version reporting */
372 FILE *); /* I/O stream to print to */
376 /* Structure for holding a single IP address and port; used for the chain of
377 addresses and ports for the local host. Make the char string large enough to
378 hold an IPv6 address. */
380 typedef struct ip_address_item {
381 struct ip_address_item *next;
383 BOOL v6_include_v4; /* Used in the daemon */
387 /* Structure for chaining together arbitrary strings. */
389 typedef struct string_item {
390 struct string_item *next;
394 /* Information about a soft delivery failure, for use when calculating
395 retry information. It's separate from the address block, because there
396 can be a chain of them for SMTP deliveries where multiple IP addresses
399 typedef struct retry_item {
400 struct retry_item *next; /* for chaining */
401 uschar *key; /* string identifying host/address/message */
402 int basic_errno; /* error code for this destination */
403 int more_errno; /* additional error information */
404 uschar *message; /* local error message */
405 int flags; /* see below */
408 /* Retry data flags */
410 #define rf_delete 0x0001 /* retry info is to be deleted */
411 #define rf_host 0x0002 /* retry info is for a remote host */
412 #define rf_message 0x0004 /* retry info is for a host+message */
414 /* Information about a constructed message that is to be sent using the
415 autoreply transport. This is pointed to from the address block. */
417 typedef struct reply_item {
418 uschar *from; /* ) */
419 uschar *reply_to; /* ) */
421 uschar *cc; /* ) specific header fields */
423 uschar *subject; /* ) */
424 uschar *headers; /* misc other headers, concatenated */
425 uschar *text; /* text string body */
426 uschar *file; /* file body */
427 BOOL file_expand; /* expand the body */
428 int expand_forbid; /* expansion lockout flags */
429 uschar *logfile; /* file to keep a log in */
430 uschar *oncelog; /* file to keep records in for once only */
431 time_t once_repeat; /* time to repeat "once only" */
432 BOOL return_message; /* send back the original message */
436 /* The address_item structure contains many fields which are used at various
437 times while delivering a message. Some are used only for remote deliveries;
438 some only for local. A particular set of fields is copied whenever a child
439 address is created. For convenience, we keep those fields in a separate
440 sub-structure so they can be copied in one go. This also means I won't forget
441 to edit the various copying places when new to-be-copied fields are added. */
443 typedef struct address_item_propagated {
444 uschar *address_data; /* arbitrary data to keep with the address */
445 uschar *domain_data; /* from "domains" lookup */
446 uschar *localpart_data; /* from "local_parts" lookup */
447 uschar *errors_address; /* where to send errors (NULL => sender) */
448 header_line *extra_headers; /* additional headers */
449 uschar *remove_headers; /* list of those to remove */
451 #ifdef EXPERIMENTAL_SRS
452 uschar *srs_sender; /* Change return path when delivering */
454 } address_item_propagated;
456 /* Bits for the flags field below */
458 #define af_allow_file 0x00000001 /* allow file in generated address */
459 #define af_allow_pipe 0x00000002 /* allow pipe in generated address */
460 #define af_allow_reply 0x00000004 /* allow autoreply in generated address */
461 #define af_dr_retry_exists 0x00000008 /* router retry record exists */
462 #define af_expand_pipe 0x00000010 /* expand pipe arguments */
463 #define af_file 0x00000020 /* file delivery; always with pfr */
464 #define af_gid_set 0x00000040 /* gid field is set */
465 #define af_home_expanded 0x00000080 /* home_dir is already expanded */
466 #define af_ignore_error 0x00000100 /* ignore delivery error */
467 #define af_initgroups 0x00000200 /* use initgroups() for local transporting */
468 #define af_local_host_removed 0x00000400 /* local host was backup */
469 #define af_lt_retry_exists 0x00000800 /* local transport retry exists */
470 #define af_pfr 0x00001000 /* pipe or file or reply delivery */
471 #define af_retry_skipped 0x00002000 /* true if retry caused some skipping */
472 #define af_retry_timedout 0x00004000 /* true if retry timed out */
473 #define af_uid_set 0x00008000 /* uid field is set */
474 #define af_hide_child 0x00010000 /* hide child in bounce/defer msgs */
475 #define af_sverify_told 0x00020000 /* sender verify failure notified */
476 #define af_verify_pmfail 0x00040000 /* verify failure was postmaster callout */
477 #define af_verify_nsfail 0x00080000 /* verify failure was null sender callout */
478 #define af_homonym 0x00100000 /* an ancestor has same address */
479 #define af_verify_routed 0x00200000 /* for cached sender verify: routed OK */
480 #define af_verify_callout 0x00400000 /* for cached sender verify: callout was specified */
481 #define af_include_affixes 0x00800000 /* delivered with affixes in RCPT */
482 #define af_cert_verified 0x01000000 /* delivered with verified TLS cert */
483 #define af_pass_message 0x02000000 /* pass message in bounces */
484 #define af_bad_reply 0x04000000 /* filter could not generate autoreply */
486 /* These flags must be propagated when a child is created */
488 #define af_propagate (af_ignore_error)
490 /* The main address structure. Note that fields that are to be copied to
491 generated addresses should be put in the address_item_propagated structure (see
492 above) rather than directly into the address_item structure. */
494 typedef struct address_item {
495 struct address_item *next; /* for chaining addresses */
496 struct address_item *parent; /* parent address */
497 struct address_item *first; /* points to first after group delivery */
498 struct address_item *dupof; /* points to address this is a duplicate of */
500 router_instance *start_router; /* generated address starts here */
501 router_instance *router; /* the router that routed */
502 transport_instance *transport; /* the transport to use */
504 host_item *host_list; /* host data for the transport */
505 host_item *host_used; /* host that took delivery or failed hard */
506 host_item *fallback_hosts; /* to try if delivery defers */
508 reply_item *reply; /* data for autoreply */
509 retry_item *retries; /* chain of retry information */
511 uschar *address; /* address being delivered or routed */
512 uschar *unique; /* used for disambiguating */
513 uschar *cc_local_part; /* caseful local part */
514 uschar *lc_local_part; /* lowercased local part */
515 uschar *local_part; /* points to cc or lc version */
516 uschar *prefix; /* stripped prefix of local part */
517 uschar *suffix; /* stripped suffix of local part */
518 uschar *domain; /* working domain (lower cased) */
520 uschar *address_retry_key; /* retry key including full address */
521 uschar *domain_retry_key; /* retry key for domain only */
523 uschar *current_dir; /* current directory for transporting */
524 uschar *home_dir; /* home directory for transporting */
525 uschar *message; /* error message */
526 uschar *user_message; /* error message that can be sent over SMTP
527 or quoted in bounce message */
528 uschar *onetime_parent; /* saved original parent for onetime */
529 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
530 uschar *return_filename; /* name of return file */
531 uschar *self_hostname; /* after self=pass */
532 uschar *shadow_message; /* info about shadow transporting */
535 uschar *cipher; /* Cipher used for transport */
536 uschar *peerdn; /* DN of server's certificate */
539 uid_t uid; /* uid for transporting */
540 gid_t gid; /* gid for transporting */
542 unsigned int flags; /* a row of bits, defined above */
543 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
544 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
545 int mode; /* mode for local transporting to a file */
546 int more_errno; /* additional error information */
547 /* (may need to hold a timestamp) */
549 short int basic_errno; /* status after failure */
550 short int child_count; /* number of child addresses */
551 short int return_file; /* fileno of return data file */
552 short int special_action; /* ( used when when deferred or failed */
554 /* ( contains = or - when successful SMTP delivered */
556 /* ( contains verify rc in sender verify cache */
557 short int transport_return; /* result of delivery attempt */
558 address_item_propagated p; /* fields that are propagated to children */
561 /* The table of header names consists of items of this type */
570 /* Chain of information about errors (e.g. bad addresses) */
572 typedef struct error_block {
573 struct error_block *next;
578 /* Chain of file names when processing the queue */
580 typedef struct queue_filename {
581 struct queue_filename *next;
586 /* Chain of items of retry information, read from the retry config. */
588 typedef struct retry_rule {
589 struct retry_rule *next;
596 typedef struct retry_config {
597 struct retry_config *next;
605 /* Structure for each node in a tree, of which there are various kinds */
607 typedef struct tree_node {
608 struct tree_node *left; /* pointer to left child */
609 struct tree_node *right; /* pointer to right child */
612 void *ptr; /* pointer to data */
613 int val; /* or integer data */
615 uschar balance; /* balancing factor */
616 uschar name[1]; /* node name - variable length */
619 /* Structure for holding the handle and the cached last lookup for searches.
620 This block is pointed to by the tree entry for the file. The file can get
621 closed if too many are opened at once. There is a LRU chain for deciding which
624 typedef struct search_cache {
625 void *handle; /* lookup handle, or NULL if closed */
626 int search_type; /* search type */
627 tree_node *up; /* LRU up pointer */
628 tree_node *down; /* LRU down pointer */
629 tree_node *item_cache; /* tree of cached results */
632 /* Structure for holding a partially decoded DNS record; the name has been
633 uncompressed, but the data pointer is into the raw data. */
636 uschar name[DNS_MAXNAME]; /* domain name */
637 int type; /* record type */
638 int size; /* size of data */
639 uschar *data; /* pointer to data */
642 /* Structure for holding the result of a DNS query. */
645 int answerlen; /* length of the answer */
646 uschar answer[MAXPACKET]; /* the answer itself */
649 /* Structure for holding the intermediate data while scanning a DNS answer
653 int rrcount; /* count of RRs in the answer */
654 uschar *aptr; /* pointer in the answer while scanning */
655 dns_record srr; /* data from current record in scan */
658 /* Structure for holding a chain of IP addresses that are extracted from
659 an A, AAAA, or A6 record. For the first two, there is only ever one address,
660 but the chaining feature of A6 allows for several addresses to be realized from
661 a single initial A6 record. The structure defines the address field of length
662 1. In use, a suitable sized block is obtained to hold the complete textual
665 typedef struct dns_address {
666 struct dns_address *next;
670 /* Structure used for holding intermediate data during MD5 computations. */
674 unsigned int abcd[4];
678 /* Structure used for holding intermediate data during SHA-1 computations. */
680 typedef struct sha1 {
686 /* Structure used to hold incoming packets of SMTP responses for a specific
687 socket. The packets which may contain multiple lines (and in some cases,
688 multiple responses). */
690 typedef struct smtp_inblock {
691 int sock; /* the socket */
692 int buffersize; /* the size of the buffer */
693 uschar *ptr; /* current position in the buffer */
694 uschar *ptrend; /* end of data in the buffer */
695 uschar *buffer; /* the buffer itself */
698 /* Structure used to hold buffered outgoing packets of SMTP commands for a
699 specific socket. The packets which may contain multiple lines when pipelining
702 typedef struct smtp_outblock {
703 int sock; /* the socket */
704 int cmd_count; /* count of buffered commands */
705 int buffersize; /* the size of the buffer */
706 BOOL authenticating; /* TRUE when authenticating */
707 uschar *ptr; /* current position in the buffer */
708 uschar *buffer; /* the buffer itself */
711 /* Structure to hold information about the source of redirection information */
713 typedef struct redirect_block {
714 uschar *string; /* file name or string */
715 uid_t *owners; /* allowed file owners */
716 gid_t *owngroups; /* allowed file groups */
717 struct passwd *pw; /* possible owner if not NULL */
718 int modemask; /* forbidden bits */
719 BOOL isfile; /* TRUE if string is a file name */
720 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
721 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
724 /* Structure for passing arguments to check_host() */
726 typedef struct check_host_block {
728 uschar *host_address;
733 /* Structure for remembering lookup data when caching the result of
734 a lookup in a named list. */
736 typedef struct namedlist_cacheblock {
737 struct namedlist_cacheblock *next;
740 } namedlist_cacheblock;
742 /* Structure for holding data for an entry in a named list */
744 typedef struct namedlist_block {
745 uschar *string; /* the list string */
746 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
747 int number; /* the number of the list for caching */
750 /* Structures for Access Control Lists */
752 typedef struct acl_condition_block {
753 struct acl_condition_block *next;
760 } acl_condition_block;
762 typedef struct acl_block {
763 struct acl_block *next;
764 acl_condition_block *condition;
768 /* End of structs.h */