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 #ifdef EXPERIMENTAL_DBL
188 uschar *dbl_delivery_query; /* String to expand on success */
190 } transport_instance;
193 /* Structure for holding information about a type of transport. The first six
194 fields must match driver_info above. */
196 typedef struct transport_info {
197 uschar *driver_name; /* Driver name */
198 optionlist *options; /* Table of private options names */
199 int *options_count; /* -> Number of entries in table */
200 void *options_block; /* Points to default private block */
201 int options_len; /* Length of same in bytes */
202 void (*init)( /* Initialization function */
203 struct transport_instance *);
205 BOOL (*code)( /* Main entry point */
206 transport_instance *,
207 struct address_item *);
208 void (*tidyup)( /* Tidyup function */
209 struct transport_instance *);
210 void (*closedown)( /* For closing down a passed channel */
211 struct transport_instance *);
212 BOOL local; /* TRUE for local transports */
217 /* Structure for holding information about the configured routers. */
219 typedef struct router_instance {
220 struct router_instance *next;
222 struct router_info *info;
223 void *options_block; /* Pointer to private options */
224 uschar *driver_name; /* Must be first */
226 uschar *address_data; /* Arbitrary data */
227 #ifdef EXPERIMENTAL_BRIGHTMAIL
228 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
230 uschar *cannot_route_message; /* Used when routing fails */
231 uschar *condition; /* General condition */
232 uschar *current_directory; /* For use during delivery */
233 uschar *debug_string; /* Debugging output */
234 uschar *domains; /* Specific domains */
235 uschar *errors_to; /* Errors address */
236 uschar *expand_gid; /* Expanded gid string */
237 uschar *expand_uid; /* Expanded uid string */
238 uschar *expand_more; /* Expanded more string */
239 uschar *expand_unseen; /* Expanded unseen string */
240 uschar *extra_headers; /* Additional headers */
241 uschar *fallback_hosts; /* For remote transports (text list) */
242 uschar *home_directory; /* For use during delivery */
243 uschar *ignore_target_hosts; /* Target hosts to ignore */
244 uschar *local_parts; /* Specific local parts */
245 uschar *pass_router_name; /* Router for passed address */
246 uschar *prefix; /* Address prefix */
247 uschar *redirect_router_name; /* Router for generated address */
248 uschar *remove_headers; /* Removed headers */
249 uschar *require_files; /* File checks before router is run */
250 uschar *router_home_directory; /* For use while routing */
251 uschar *self; /* Text option for handling self reference */
252 uschar *senders; /* Specific senders */
253 uschar *suffix; /* Address suffix */
254 uschar *translate_ip_address; /* IP address translation fudgery */
255 uschar *transport_name; /* Transport name */
257 BOOL address_test; /* Use this router when testing addresses */
258 #ifdef EXPERIMENTAL_BRIGHTMAIL
259 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
260 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
261 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
263 BOOL expn; /* Use this router when processing EXPN */
264 BOOL caseful_local_part; /* TRUE => don't lowercase */
265 BOOL check_local_user; /* TRUE => check local user */
266 BOOL disable_logging; /* For very weird requirements */
267 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
268 BOOL fail_verify_sender; /* Fail verify if sender match this router */
269 BOOL gid_set; /* Flag to indicate gid is set */
270 BOOL initgroups; /* TRUE if initgroups is required */
271 BOOL log_as_local; /* TRUE logs as a local delivery */
272 BOOL more; /* If FALSE, do no more if this one fails */
273 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
274 BOOL prefix_optional; /* Just what it says */
275 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
276 BOOL retry_use_local_part; /* Just what it says */
277 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
278 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
279 BOOL suffix_optional; /* As it says */
280 BOOL verify_only; /* Skip this router if not verifying */
281 BOOL verify_recipient; /* Use this router when verifying a recipient*/
282 BOOL verify_sender; /* Use this router when verifying a sender */
283 BOOL uid_set; /* Flag to indicate uid is set */
284 BOOL unseen; /* If TRUE carry on, even after success */
286 int self_code; /* Encoded version of "self" */
287 uid_t uid; /* Fixed uid value */
288 gid_t gid; /* Fixed gid value */
290 host_item *fallback_hostlist; /* For remote transport (block chain) */
291 transport_instance *transport; /* Transport block (when found) */
292 struct router_instance *pass_router; /* Actual router for passed address */
293 struct router_instance *redirect_router; /* Actual router for generated address */
297 /* Structure for holding information about a type of router. The first six
298 fields must match driver_info above. */
300 typedef struct router_info {
302 optionlist *options; /* Table of private options names */
303 int *options_count; /* -> Number of entries in table */
304 void *options_block; /* Points to default private block */
305 int options_len; /* Length of same in bytes */
306 void (*init)( /* Initialization function */
307 struct router_instance *);
309 int (*code)( /* Main entry point */
311 struct address_item *,
314 struct address_item **,
315 struct address_item **,
316 struct address_item **,
317 struct address_item **);
318 void (*tidyup)( /* Tidyup function */
319 struct router_instance *);
320 int ri_flags; /* Descriptive flags */
324 /* Structure for holding information about a lookup type. */
326 #include "lookupapi.h"
329 /* Structure for holding information about the configured authentication
332 typedef struct auth_instance {
333 struct auth_instance *next;
334 uschar *name; /* Exim instance name */
335 struct auth_info *info; /* Pointer to driver info block */
336 void *options_block; /* Pointer to private options */
337 uschar *driver_name; /* Must be first */
338 uschar *advertise_condition; /* Are we going to advertise this?*/
339 uschar *client_condition; /* Should the client try this? */
340 uschar *public_name; /* Advertised name */
341 uschar *set_id; /* String to set when server as authenticated id */
342 uschar *set_client_id; /* String to set when client as client_authenticated id */
343 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
344 uschar *server_debug_string; /* Debugging output */
345 uschar *server_condition; /* Authorization condition */
346 BOOL client; /* TRUE if client option(s) set */
347 BOOL server; /* TRUE if server options(s) set */
348 BOOL advertised; /* Set TRUE when advertised */
352 /* Structure for holding information about an authentication mechanism. The
353 first six fields must match driver_info above. */
355 typedef struct auth_info {
356 uschar *driver_name; /* e.g. "condition" */
357 optionlist *options; /* Table of private options names */
358 int *options_count; /* -> Number of entries in table */
359 void *options_block; /* Points to default private block */
360 int options_len; /* Length of same in bytes */
361 void (*init)( /* initialization function */
362 struct auth_instance *);
364 int (*servercode)( /* server function */
365 auth_instance *, /* the instance data */
366 uschar *); /* rest of AUTH command */
367 int (*clientcode)( /* client function */
368 struct auth_instance *,
369 struct smtp_inblock *, /* socket and input buffer */
370 struct smtp_outblock *, /* socket and output buffer */
371 int, /* command timeout */
372 uschar *, /* buffer for reading response */
373 int); /* sizeof buffer */
374 void (*version_report)( /* diagnostic version reporting */
375 FILE *); /* I/O stream to print to */
379 /* Structure for holding a single IP address and port; used for the chain of
380 addresses and ports for the local host. Make the char string large enough to
381 hold an IPv6 address. */
383 typedef struct ip_address_item {
384 struct ip_address_item *next;
386 BOOL v6_include_v4; /* Used in the daemon */
390 /* Structure for chaining together arbitrary strings. */
392 typedef struct string_item {
393 struct string_item *next;
397 /* Information about a soft delivery failure, for use when calculating
398 retry information. It's separate from the address block, because there
399 can be a chain of them for SMTP deliveries where multiple IP addresses
402 typedef struct retry_item {
403 struct retry_item *next; /* for chaining */
404 uschar *key; /* string identifying host/address/message */
405 int basic_errno; /* error code for this destination */
406 int more_errno; /* additional error information */
407 uschar *message; /* local error message */
408 int flags; /* see below */
411 /* Retry data flags */
413 #define rf_delete 0x0001 /* retry info is to be deleted */
414 #define rf_host 0x0002 /* retry info is for a remote host */
415 #define rf_message 0x0004 /* retry info is for a host+message */
417 /* Information about a constructed message that is to be sent using the
418 autoreply transport. This is pointed to from the address block. */
420 typedef struct reply_item {
421 uschar *from; /* ) */
422 uschar *reply_to; /* ) */
424 uschar *cc; /* ) specific header fields */
426 uschar *subject; /* ) */
427 uschar *headers; /* misc other headers, concatenated */
428 uschar *text; /* text string body */
429 uschar *file; /* file body */
430 BOOL file_expand; /* expand the body */
431 int expand_forbid; /* expansion lockout flags */
432 uschar *logfile; /* file to keep a log in */
433 uschar *oncelog; /* file to keep records in for once only */
434 time_t once_repeat; /* time to repeat "once only" */
435 BOOL return_message; /* send back the original message */
439 /* The address_item structure contains many fields which are used at various
440 times while delivering a message. Some are used only for remote deliveries;
441 some only for local. A particular set of fields is copied whenever a child
442 address is created. For convenience, we keep those fields in a separate
443 sub-structure so they can be copied in one go. This also means I won't forget
444 to edit the various copying places when new to-be-copied fields are added. */
446 typedef struct address_item_propagated {
447 uschar *address_data; /* arbitrary data to keep with the address */
448 uschar *domain_data; /* from "domains" lookup */
449 uschar *localpart_data; /* from "local_parts" lookup */
450 uschar *errors_address; /* where to send errors (NULL => sender) */
451 header_line *extra_headers; /* additional headers */
452 uschar *remove_headers; /* list of those to remove */
454 #ifdef EXPERIMENTAL_SRS
455 uschar *srs_sender; /* Change return path when delivering */
457 } address_item_propagated;
459 /* Bits for the flags field below */
461 #define af_allow_file 0x00000001 /* allow file in generated address */
462 #define af_allow_pipe 0x00000002 /* allow pipe in generated address */
463 #define af_allow_reply 0x00000004 /* allow autoreply in generated address */
464 #define af_dr_retry_exists 0x00000008 /* router retry record exists */
465 #define af_expand_pipe 0x00000010 /* expand pipe arguments */
466 #define af_file 0x00000020 /* file delivery; always with pfr */
467 #define af_gid_set 0x00000040 /* gid field is set */
468 #define af_home_expanded 0x00000080 /* home_dir is already expanded */
469 #define af_ignore_error 0x00000100 /* ignore delivery error */
470 #define af_initgroups 0x00000200 /* use initgroups() for local transporting */
471 #define af_local_host_removed 0x00000400 /* local host was backup */
472 #define af_lt_retry_exists 0x00000800 /* local transport retry exists */
473 #define af_pfr 0x00001000 /* pipe or file or reply delivery */
474 #define af_retry_skipped 0x00002000 /* true if retry caused some skipping */
475 #define af_retry_timedout 0x00004000 /* true if retry timed out */
476 #define af_uid_set 0x00008000 /* uid field is set */
477 #define af_hide_child 0x00010000 /* hide child in bounce/defer msgs */
478 #define af_sverify_told 0x00020000 /* sender verify failure notified */
479 #define af_verify_pmfail 0x00040000 /* verify failure was postmaster callout */
480 #define af_verify_nsfail 0x00080000 /* verify failure was null sender callout */
481 #define af_homonym 0x00100000 /* an ancestor has same address */
482 #define af_verify_routed 0x00200000 /* for cached sender verify: routed OK */
483 #define af_verify_callout 0x00400000 /* for cached sender verify: callout was specified */
484 #define af_include_affixes 0x00800000 /* delivered with affixes in RCPT */
485 #define af_cert_verified 0x01000000 /* delivered with verified TLS cert */
486 #define af_pass_message 0x02000000 /* pass message in bounces */
487 #define af_bad_reply 0x04000000 /* filter could not generate autoreply */
488 #ifdef EXPERIMENTAL_PRDR
489 # define af_prdr_used 0x08000000 /* delivery used SMTP PRDR */
491 #define af_force_command 0x10000000 /* force_command in pipe transport */
493 /* These flags must be propagated when a child is created */
495 #define af_propagate (af_ignore_error)
497 /* The main address structure. Note that fields that are to be copied to
498 generated addresses should be put in the address_item_propagated structure (see
499 above) rather than directly into the address_item structure. */
501 typedef struct address_item {
502 struct address_item *next; /* for chaining addresses */
503 struct address_item *parent; /* parent address */
504 struct address_item *first; /* points to first after group delivery */
505 struct address_item *dupof; /* points to address this is a duplicate of */
507 router_instance *start_router; /* generated address starts here */
508 router_instance *router; /* the router that routed */
509 transport_instance *transport; /* the transport to use */
511 host_item *host_list; /* host data for the transport */
512 host_item *host_used; /* host that took delivery or failed hard */
513 host_item *fallback_hosts; /* to try if delivery defers */
515 reply_item *reply; /* data for autoreply */
516 retry_item *retries; /* chain of retry information */
518 uschar *address; /* address being delivered or routed */
519 uschar *unique; /* used for disambiguating */
520 uschar *cc_local_part; /* caseful local part */
521 uschar *lc_local_part; /* lowercased local part */
522 uschar *local_part; /* points to cc or lc version */
523 uschar *prefix; /* stripped prefix of local part */
524 uschar *suffix; /* stripped suffix of local part */
525 uschar *domain; /* working domain (lower cased) */
527 uschar *address_retry_key; /* retry key including full address */
528 uschar *domain_retry_key; /* retry key for domain only */
530 uschar *current_dir; /* current directory for transporting */
531 uschar *home_dir; /* home directory for transporting */
532 uschar *message; /* error message */
533 uschar *user_message; /* error message that can be sent over SMTP
534 or quoted in bounce message */
535 uschar *onetime_parent; /* saved original parent for onetime */
536 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
537 uschar *return_filename; /* name of return file */
538 uschar *self_hostname; /* after self=pass */
539 uschar *shadow_message; /* info about shadow transporting */
542 uschar *cipher; /* Cipher used for transport */
543 uschar *peerdn; /* DN of server's certificate */
546 uschar *authenticator; /* auth driver name used by transport */
547 uschar *auth_id; /* auth "login" name used by transport */
548 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
550 uid_t uid; /* uid for transporting */
551 gid_t gid; /* gid for transporting */
553 unsigned int flags; /* a row of bits, defined above */
554 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
555 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
556 int mode; /* mode for local transporting to a file */
557 int more_errno; /* additional error information */
558 /* (may need to hold a timestamp) */
560 short int basic_errno; /* status after failure */
561 short int child_count; /* number of child addresses */
562 short int return_file; /* fileno of return data file */
563 short int special_action; /* ( used when when deferred or failed */
565 /* ( contains = or - when successful SMTP delivered */
567 /* ( contains verify rc in sender verify cache */
568 short int transport_return; /* result of delivery attempt */
569 address_item_propagated p; /* fields that are propagated to children */
572 /* The table of header names consists of items of this type */
581 /* Chain of information about errors (e.g. bad addresses) */
583 typedef struct error_block {
584 struct error_block *next;
589 /* Chain of file names when processing the queue */
591 typedef struct queue_filename {
592 struct queue_filename *next;
597 /* Chain of items of retry information, read from the retry config. */
599 typedef struct retry_rule {
600 struct retry_rule *next;
607 typedef struct retry_config {
608 struct retry_config *next;
616 /* Structure for each node in a tree, of which there are various kinds */
618 typedef struct tree_node {
619 struct tree_node *left; /* pointer to left child */
620 struct tree_node *right; /* pointer to right child */
623 void *ptr; /* pointer to data */
624 int val; /* or integer data */
626 uschar balance; /* balancing factor */
627 uschar name[1]; /* node name - variable length */
630 /* Structure for holding the handle and the cached last lookup for searches.
631 This block is pointed to by the tree entry for the file. The file can get
632 closed if too many are opened at once. There is a LRU chain for deciding which
635 typedef struct search_cache {
636 void *handle; /* lookup handle, or NULL if closed */
637 int search_type; /* search type */
638 tree_node *up; /* LRU up pointer */
639 tree_node *down; /* LRU down pointer */
640 tree_node *item_cache; /* tree of cached results */
643 /* Structure for holding a partially decoded DNS record; the name has been
644 uncompressed, but the data pointer is into the raw data. */
647 uschar name[DNS_MAXNAME]; /* domain name */
648 int type; /* record type */
649 int size; /* size of data */
650 uschar *data; /* pointer to data */
653 /* Structure for holding the result of a DNS query. */
656 int answerlen; /* length of the answer */
657 uschar answer[MAXPACKET]; /* the answer itself */
660 /* Structure for holding the intermediate data while scanning a DNS answer
664 int rrcount; /* count of RRs in the answer */
665 uschar *aptr; /* pointer in the answer while scanning */
666 dns_record srr; /* data from current record in scan */
669 /* Structure for holding a chain of IP addresses that are extracted from
670 an A, AAAA, or A6 record. For the first two, there is only ever one address,
671 but the chaining feature of A6 allows for several addresses to be realized from
672 a single initial A6 record. The structure defines the address field of length
673 1. In use, a suitable sized block is obtained to hold the complete textual
676 typedef struct dns_address {
677 struct dns_address *next;
681 /* Structure used for holding intermediate data during MD5 computations. */
685 unsigned int abcd[4];
689 /* Structure used for holding intermediate data during SHA-1 computations. */
691 typedef struct sha1 {
697 /* Structure used to hold incoming packets of SMTP responses for a specific
698 socket. The packets which may contain multiple lines (and in some cases,
699 multiple responses). */
701 typedef struct smtp_inblock {
702 int sock; /* the socket */
703 int buffersize; /* the size of the buffer */
704 uschar *ptr; /* current position in the buffer */
705 uschar *ptrend; /* end of data in the buffer */
706 uschar *buffer; /* the buffer itself */
709 /* Structure used to hold buffered outgoing packets of SMTP commands for a
710 specific socket. The packets which may contain multiple lines when pipelining
713 typedef struct smtp_outblock {
714 int sock; /* the socket */
715 int cmd_count; /* count of buffered commands */
716 int buffersize; /* the size of the buffer */
717 BOOL authenticating; /* TRUE when authenticating */
718 uschar *ptr; /* current position in the buffer */
719 uschar *buffer; /* the buffer itself */
722 /* Structure to hold information about the source of redirection information */
724 typedef struct redirect_block {
725 uschar *string; /* file name or string */
726 uid_t *owners; /* allowed file owners */
727 gid_t *owngroups; /* allowed file groups */
728 struct passwd *pw; /* possible owner if not NULL */
729 int modemask; /* forbidden bits */
730 BOOL isfile; /* TRUE if string is a file name */
731 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
732 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
735 /* Structure for passing arguments to check_host() */
737 typedef struct check_host_block {
739 uschar *host_address;
744 /* Structure for remembering lookup data when caching the result of
745 a lookup in a named list. */
747 typedef struct namedlist_cacheblock {
748 struct namedlist_cacheblock *next;
751 } namedlist_cacheblock;
753 /* Structure for holding data for an entry in a named list */
755 typedef struct namedlist_block {
756 uschar *string; /* the list string */
757 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
758 int number; /* the number of the list for caching */
761 /* Structures for Access Control Lists */
763 typedef struct acl_condition_block {
764 struct acl_condition_block *next;
771 } acl_condition_block;
773 typedef struct acl_block {
774 struct acl_block *next;
775 acl_condition_block *condition;
779 /* End of structs.h */