791e11c698eb563fe689539335b8adef76ff5d23
[exim.git] / src / src / structs.h
1 /* $Cambridge: exim/src/src/structs.h,v 1.4 2005/02/17 11:58:26 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 /* Definitions of various structures. In addition, those that are visible for
12 the compilation of local_scan() are defined in local_scan.h. These are
13
14 header_line
15 optionlist
16 recipient_item
17
18 For those declared here, we have to pre-declare some because of mutually
19 recursive definitions in the auths, routers, and transports blocks. */
20
21 struct address_item;
22 struct auth_info;
23 struct driver_info;
24 struct director_info;
25 struct smtp_inblock;
26 struct smtp_outblock;
27 struct transport_info;
28 struct router_info;
29
30 /* Structure for remembering macros for the configuration file */
31
32 typedef struct macro_item {
33 struct macro_item *next;
34 BOOL command_line;
35 uschar *replacement;
36 uschar name[1];
37 } macro_item;
38
39 /* Structure for bit tables for debugging and logging */
40
41 typedef struct bit_table {
42 uschar *name;
43 unsigned int bit;
44 } bit_table;
45
46 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
47
48 typedef struct ugid_block {
49 uid_t uid;
50 gid_t gid;
51 BOOL uid_set;
52 BOOL gid_set;
53 BOOL initgroups;
54 } ugid_block;
55
56 /* Structure for holding information about a host for use mainly by routers,
57 but also used when checking lists of hosts and when transporting. Looking up
58 host addresses is done using this structure. */
59
60 typedef struct host_item {
61 struct host_item *next;
62 uschar *name; /* Host name */
63 uschar *address; /* IP address in text form */
64 int port; /* port value in host order (if SRV lookup) */
65 int mx; /* MX value if found via MX records */
66 int sort_key; /* MX*1000 plus random "fraction" */
67 int status; /* Usable, unusable, or unknown */
68 int why; /* Why host is unusable */
69 int last_try; /* Time of last try if known */
70 BOOL update_waiting; /* Turned off if wait db not to be updated */
71 } host_item;
72
73 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
74 rewrite_headers field of a transport. */
75
76 typedef struct rewrite_rule {
77 struct rewrite_rule *next;
78 int flags;
79 uschar *key;
80 uschar *replacement;
81 } rewrite_rule;
82
83 /* This structure is used to pass back configuration data from the smtp
84 transport to the outside world. It is used during callback processing. If ever
85 another remote transport were implemented, it could use the same structure. */
86
87 typedef struct transport_feedback {
88 uschar *interface;
89 uschar *port;
90 uschar *protocol;
91 uschar *hosts;
92 BOOL hosts_override;
93 BOOL hosts_randomize;
94 BOOL gethostbyname;
95 BOOL qualify_single;
96 BOOL search_parents;
97 } transport_feedback;
98
99 /* Routers, transports, and authenticators have similar data blocks. Each
100 driver that is compiled into the code is represented by a xxx_info block; the
101 active drivers are represented by a chain of xxx_instance blocks. To make it
102 possible to use the same code for reading the configuration files for all
103 three, the layout of the start of the blocks is kept the same, and represented
104 by the generic structures driver_info and driver_instance. */
105
106 typedef struct driver_instance {
107 struct driver_instance *next;
108 uschar *name; /* Instance name */
109 struct driver_info *info; /* Points to info for this driver */
110 void *options_block; /* Pointer to private options */
111 uschar *driver_name; /* All start with this generic option */
112 } driver_instance;
113
114 typedef struct driver_info {
115 uschar *driver_name; /* Name of driver */
116 optionlist *options; /* Table of private options names */
117 int *options_count; /* -> Number of entries in table */
118 void *options_block; /* Points to default private block */
119 int options_len; /* Length of same in bytes */
120 void (*init)( /* Initialization entry point */
121 struct driver_instance *);
122 } driver_info;
123
124
125 /* Structure for holding information about the configured transports. Some
126 of the generally accessible options are set from the configuration file; others
127 are set by transport initialization, since they can only be set for certain
128 transports. They need to be generally accessible, however, as they are used by
129 the main transport code. */
130
131 typedef struct transport_instance {
132 struct transport_instance *next;
133 uschar *name; /* Instance name */
134 struct transport_info *info; /* Info for this driver */
135 void *options_block; /* Pointer to private options */
136 uschar *driver_name; /* Must be first */
137 int (*setup)( /* Setup entry point */
138 struct transport_instance *,
139 struct address_item *,
140 struct transport_feedback *, /* For passing back config data */
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 */
158 uid_t uid;
159 gid_t gid;
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;
188
189
190 /* Structure for holding information about a type of transport. The first six
191 fields must match driver_info above. */
192
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 *);
201 /****/
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 */
210 } transport_info;
211
212
213
214 /* Structure for holding information about the configured routers. */
215
216 typedef struct router_instance {
217 struct router_instance *next;
218 uschar *name;
219 struct router_info *info;
220 void *options_block; /* Pointer to private options */
221 uschar *driver_name; /* Must be first */
222
223 uschar *address_data; /* Arbitrary data */
224 #ifdef EXPERIMENTAL_BRIGHTMAIL
225 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
226 #endif
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 */
253
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 */
259 #endif
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 */
282
283 int self_code; /* Encoded version of "self" */
284 uid_t uid; /* Fixed uid value */
285 gid_t gid; /* Fixed gid value */
286
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 */
291 } router_instance;
292
293
294 /* Structure for holding information about a type of router. The first six
295 fields must match driver_info above. */
296
297 typedef struct router_info {
298 uschar *driver_name;
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 *);
305 /****/
306 int (*code)( /* Main entry point */
307 router_instance *,
308 struct address_item *,
309 struct passwd *,
310 BOOL,
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 */
318 } router_info;
319
320
321 /* Structure for holding information about a lookup type. */
322
323 typedef struct lookup_info {
324 uschar *name; /* e.g. "lsearch" */
325 int type; /* query/singlekey/abs-file */
326 void *(*open)( /* open function */
327 uschar *, /* file name for those that have one */
328 uschar **); /* for error message */
329 BOOL (*check)( /* file checking function */
330 void *, /* handle */
331 uschar *, /* file name */
332 int, /* modemask for file checking */
333 uid_t *, /* owners for file checking */
334 gid_t *, /* owngroups for file checking */
335 uschar **); /* for error messages */
336 int (*find)( /* find function */
337 void *, /* handle */
338 uschar *, /* file name or NULL */
339 uschar *, /* key or query */
340 int, /* length of key or query */
341 uschar **, /* for returning answer */
342 uschar **, /* for error message */
343 BOOL *); /* to request cache cleanup */
344 void (*close)( /* close function */
345 void *); /* handle */
346 void (*tidy)(void); /* tidy function */
347 uschar *(*quote)( /* quoting function */
348 uschar *, /* string to quote */
349 uschar *); /* additional data from quote name */
350 } lookup_info;
351
352
353 /* Structure for holding information about the configured authentication
354 mechanisms */
355
356 typedef struct auth_instance {
357 struct auth_instance *next;
358 uschar *name; /* Exim instance name */
359 struct auth_info *info; /* Pointer to driver info block */
360 void *options_block; /* Pointer to private options */
361 uschar *driver_name; /* Must be first */
362 uschar *advertise_condition; /* Are we going to advertise this?*/
363 uschar *public_name; /* Advertised name */
364 uschar *set_id; /* String to set as authenticated id */
365 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
366 uschar *server_debug_string; /* Debugging output */
367 BOOL client; /* TRUE if client option(s) set */
368 BOOL server; /* TRUE if server options(s) set */
369 BOOL advertised; /* Set TRUE when advertised */
370 } auth_instance;
371
372
373 /* Structure for holding information about an authentication mechanism. The
374 first six fields must match driver_info above. */
375
376 typedef struct auth_info {
377 uschar *driver_name; /* e.g. "condition" */
378 optionlist *options; /* Table of private options names */
379 int *options_count; /* -> Number of entries in table */
380 void *options_block; /* Points to default private block */
381 int options_len; /* Length of same in bytes */
382 void (*init)( /* initialization function */
383 struct auth_instance *);
384 /****/
385 int (*servercode)( /* server function */
386 auth_instance *, /* the instance data */
387 uschar *); /* rest of AUTH command */
388 int (*clientcode)( /* client function */
389 struct auth_instance *,
390 struct smtp_inblock *, /* socket and input buffer */
391 struct smtp_outblock *, /* socket and output buffer */
392 int, /* command timeout */
393 uschar *, /* buffer for reading response */
394 int); /* sizeof buffer */
395 } auth_info;
396
397
398 /* Structure for holding a single IP address and port; used for the chain of
399 addresses and ports for the local host. Make the char string large enough to
400 hold an IPv6 address. */
401
402 typedef struct ip_address_item {
403 struct ip_address_item *next;
404 int port;
405 BOOL v6_include_v4; /* Used in the daemon */
406 uschar address[46];
407 } ip_address_item;
408
409 /* Structure for chaining together arbitrary strings. */
410
411 typedef struct string_item {
412 struct string_item *next;
413 uschar *text;
414 } string_item;
415
416 /* Information about a soft delivery failure, for use when calculating
417 retry information. It's separate from the address block, because there
418 can be a chain of them for SMTP deliveries where multiple IP addresses
419 can be tried. */
420
421 typedef struct retry_item {
422 struct retry_item *next; /* for chaining */
423 uschar *key; /* string identifying host/address/message */
424 int basic_errno; /* error code for this destination */
425 int more_errno; /* additional error information */
426 uschar *message; /* local error message */
427 int flags; /* see below */
428 } retry_item;
429
430 /* Retry data flags */
431
432 #define rf_delete 0x0001 /* retry info is to be deleted */
433 #define rf_host 0x0002 /* retry info is for a remote host */
434 #define rf_message 0x0004 /* retry info is for a host+message */
435
436 /* Information about a constructed message that is to be sent using the
437 autoreply transport. This is pointed to from the address block. */
438
439 typedef struct reply_item {
440 uschar *from; /* ) */
441 uschar *reply_to; /* ) */
442 uschar *to; /* ) */
443 uschar *cc; /* ) specific header fields */
444 uschar *bcc; /* ) */
445 uschar *subject; /* ) */
446 uschar *headers; /* misc other headers, concatenated */
447 uschar *text; /* text string body */
448 uschar *file; /* file body */
449 BOOL file_expand; /* expand the body */
450 int expand_forbid; /* expansion lockout flags */
451 uschar *logfile; /* file to keep a log in */
452 uschar *oncelog; /* file to keep records in for once only */
453 time_t once_repeat; /* time to repeat "once only" */
454 BOOL return_message; /* send back the original message */
455 } reply_item;
456
457
458 /* The address_item structure contains many fields which are used at various
459 times while delivering a message. Some are used only for remote deliveries;
460 some only for local. A particular set of fields is copied whenever a child
461 address is created. For convenience, we keep those fields in a separate
462 sub-structure so they can be copied in one go. This also means I won't forget
463 to edit the various copying places when new to-be-copied fields are added. */
464
465 typedef struct address_item_propagated {
466 uschar *address_data; /* arbitrary data to keep with the address */
467 uschar *domain_data; /* from "domains" lookup */
468 uschar *localpart_data; /* from "local_parts" lookup */
469 uschar *errors_address; /* where to send errors (NULL => sender) */
470 header_line *extra_headers; /* additional headers */
471 uschar *remove_headers; /* list of those to remove */
472 } address_item_propagated;
473
474 /* Bits for the flags field below */
475
476 #define af_allow_file 0x00000001 /* allow file in generated address */
477 #define af_allow_pipe 0x00000002 /* allow pipe in generated address */
478 #define af_allow_reply 0x00000004 /* allow autoreply in generated address */
479 #define af_dr_retry_exists 0x00000008 /* router retry record exists */
480 #define af_expand_pipe 0x00000010 /* expand pipe arguments */
481 #define af_file 0x00000020 /* file delivery; always with pfr */
482 #define af_gid_set 0x00000040 /* gid field is set */
483 #define af_home_expanded 0x00000080 /* home_dir is already expanded */
484 #define af_ignore_error 0x00000100 /* ignore delivery error */
485 #define af_initgroups 0x00000200 /* use initgroups() for local transporting */
486 #define af_local_host_removed 0x00000400 /* local host was backup */
487 #define af_lt_retry_exists 0x00000800 /* local transport retry exists */
488 #define af_pfr 0x00001000 /* pipe or file or reply delivery */
489 #define af_retry_skipped 0x00002000 /* true if retry caused some skipping */
490 #define af_retry_timedout 0x00004000 /* true if retry timed out */
491 #define af_uid_set 0x00008000 /* uid field is set */
492 #define af_hide_child 0x00010000 /* hide child in bounce/defer msgs */
493 #define af_sverify_told 0x00020000 /* sender verify failure notified */
494 #define af_verify_pmfail 0x00040000 /* verify failure was postmaster callout */
495 #define af_verify_nsfail 0x00080000 /* verify failure was null sender callout */
496 #define af_homonym 0x00100000 /* an ancestor has same address */
497 #define af_verify_routed 0x00200000 /* for cached sender verify: routed OK */
498 #define af_verify_callout 0x00400000 /* for cached sender verify: callout was specified */
499 #define af_include_affixes 0x00800000 /* delivered with affixes in RCPT */
500 #define af_cert_verified 0x01000000 /* delivered with verified TLS cert */
501
502 /* These flags must be propagated when a child is created */
503
504 #define af_propagate (af_ignore_error)
505
506 /* The main address structure. Note that fields that are to be copied to
507 generated addresses should be put in the address_item_propagated structure (see
508 above) rather than directly into the address_item structure. */
509
510 typedef struct address_item {
511 struct address_item *next; /* for chaining addresses */
512 struct address_item *parent; /* parent address */
513 struct address_item *first; /* points to first after group delivery */
514 struct address_item *dupof; /* points to address this is a duplicate of */
515
516 router_instance *start_router; /* generated address starts here */
517 router_instance *router; /* the router that routed */
518 transport_instance *transport; /* the transport to use */
519
520 host_item *host_list; /* host data for the transport */
521 host_item *host_used; /* host that took delivery or failed hard */
522 host_item *fallback_hosts; /* to try if delivery defers */
523
524 reply_item *reply; /* data for autoreply */
525 retry_item *retries; /* chain of retry information */
526
527 uschar *address; /* address being delivered or routed */
528 uschar *unique; /* used for disambiguating */
529 uschar *cc_local_part; /* caseful local part */
530 uschar *lc_local_part; /* lowercased local part */
531 uschar *local_part; /* points to cc or lc version */
532 uschar *prefix; /* stripped prefix of local part */
533 uschar *suffix; /* stripped suffix of local part */
534 uschar *domain; /* working domain (lower cased) */
535
536 uschar *address_retry_key; /* retry key including full address */
537 uschar *domain_retry_key; /* retry key for domain only */
538
539 uschar *current_dir; /* current directory for transporting */
540 uschar *home_dir; /* home directory for transporting */
541 uschar *message; /* error message */
542 uschar *user_message; /* error message that can be sent over SMTP
543 or quoted in bounce message */
544 uschar *onetime_parent; /* saved original parent for onetime */
545 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
546 uschar *return_filename; /* name of return file */
547 uschar *self_hostname; /* after self=pass */
548 uschar *shadow_message; /* info about shadow transporting */
549
550 #ifdef SUPPORT_TLS
551 uschar *cipher; /* Cipher used for transport */
552 uschar *peerdn; /* DN of server's certificate */
553 #endif
554
555 uid_t uid; /* uid for transporting */
556 gid_t gid; /* gid for transporting */
557
558 unsigned int flags; /* a row of bits, defined above */
559 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
560 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
561 int mode; /* mode for local transporting to a file */
562 int more_errno; /* additional error information */
563 /* (may need to hold a timestamp) */
564
565 short int basic_errno; /* status after failure */
566 short int child_count; /* number of child addresses */
567 short int return_file; /* fileno of return data file */
568 short int special_action; /* ( used when when deferred or failed */
569 /* ( also */
570 /* ( contains = or - when successful SMTP delivered */
571 /* ( also */
572 /* ( contains verify rc in sender verify cache */
573 short int transport_return; /* result of delivery attempt */
574 address_item_propagated p; /* fields that are propagated to children */
575 } address_item;
576
577 /* The table of header names consists of items of this type */
578
579 typedef struct {
580 uschar *name;
581 int len;
582 BOOL allow_resent;
583 int htype;
584 } header_name;
585
586 /* Chain of information about errors (e.g. bad addresses) */
587
588 typedef struct error_block {
589 struct error_block *next;
590 uschar *text1;
591 uschar *text2;
592 } error_block;
593
594 /* Chain of file names when processing the queue */
595
596 typedef struct queue_filename {
597 struct queue_filename *next;
598 uschar dir_uschar;
599 uschar text[1];
600 } queue_filename;
601
602 /* Chain of items of retry information, read from the retry config. */
603
604 typedef struct retry_rule {
605 struct retry_rule *next;
606 int rule;
607 int timeout;
608 int p1;
609 int p2;
610 } retry_rule;
611
612 typedef struct retry_config {
613 struct retry_config *next;
614 uschar *pattern;
615 int basic_errno;
616 int more_errno;
617 uschar *senders;
618 retry_rule *rules;
619 } retry_config;
620
621 /* Structure for each node in a tree, of which there are various kinds */
622
623 typedef struct tree_node {
624 struct tree_node *left; /* pointer to left child */
625 struct tree_node *right; /* pointer to right child */
626 union
627 {
628 void *ptr; /* pointer to data */
629 int val; /* or integer data */
630 } data;
631 uschar balance; /* balancing factor */
632 uschar name[1]; /* node name - variable length */
633 } tree_node;
634
635 /* Structure for holding the handle and the cached last lookup for searches.
636 This block is pointed to by the tree entry for the file. The file can get
637 closed if too many are opened at once. There is a LRU chain for deciding which
638 to close. */
639
640 typedef struct search_cache {
641 void *handle; /* lookup handle, or NULL if closed */
642 int search_type; /* search type */
643 tree_node *up; /* LRU up pointer */
644 tree_node *down; /* LRU down pointer */
645 tree_node *item_cache; /* tree of cached results */
646 } search_cache;
647
648 /* Structure for holding a partially decoded DNS record; the name has been
649 uncompressed, but the data pointer is into the raw data. */
650
651 typedef struct {
652 uschar name[DNS_MAXNAME]; /* domain name */
653 int type; /* record type */
654 int size; /* size of data */
655 uschar *data; /* pointer to data */
656 } dns_record;
657
658 /* Structure for holding the result of a DNS query. */
659
660 typedef struct {
661 int answerlen; /* length of the answer */
662 uschar answer[MAXPACKET]; /* the answer itself */
663 } dns_answer;
664
665 /* Structure for holding the intermediate data while scanning a DNS answer
666 block. */
667
668 typedef struct {
669 int rrcount; /* count of RRs in the answer */
670 uschar *aptr; /* pointer in the answer while scanning */
671 dns_record srr; /* data from current record in scan */
672 } dns_scan;
673
674 /* Structure for holding a chain of IP addresses that are extracted from
675 an A, AAAA, or A6 record. For the first two, there is only ever one address,
676 but the chaining feature of A6 allows for several addresses to be realized from
677 a single initial A6 record. The structure defines the address field of length
678 1. In use, a suitable sized block is obtained to hold the complete textual
679 address. */
680
681 typedef struct dns_address {
682 struct dns_address *next;
683 uschar address[1];
684 } dns_address;
685
686 /* Structure used for holding intermediate data during MD5 computations. */
687
688 typedef struct md5 {
689 unsigned int length;
690 unsigned int abcd[4];
691 }
692 md5;
693
694 /* Structure used for holding intermediate data during SHA-1 computations. */
695
696 typedef struct sha1 {
697 unsigned int H[5];
698 unsigned int length;
699 }
700 sha1;
701
702 /* Structure used to hold incoming packets of SMTP responses for a specific
703 socket. The packets which may contain multiple lines (and in some cases,
704 multiple responses). */
705
706 typedef struct smtp_inblock {
707 int sock; /* the socket */
708 int buffersize; /* the size of the buffer */
709 uschar *ptr; /* current position in the buffer */
710 uschar *ptrend; /* end of data in the buffer */
711 uschar *buffer; /* the buffer itself */
712 } smtp_inblock;
713
714 /* Structure used to hold buffered outgoing packets of SMTP commands for a
715 specific socket. The packets which may contain multiple lines when pipelining
716 is in use. */
717
718 typedef struct smtp_outblock {
719 int sock; /* the socket */
720 int cmd_count; /* count of buffered commands */
721 int buffersize; /* the size of the buffer */
722 BOOL authenticating; /* TRUE when authenticating */
723 uschar *ptr; /* current position in the buffer */
724 uschar *buffer; /* the buffer itself */
725 } smtp_outblock;
726
727 /* Structure to hold information about the source of redirection information */
728
729 typedef struct redirect_block {
730 uschar *string; /* file name or string */
731 uid_t *owners; /* allowed file owners */
732 gid_t *owngroups; /* allowed file groups */
733 struct passwd *pw; /* possible owner if not NULL */
734 int modemask; /* forbidden bits */
735 BOOL isfile; /* TRUE if string is a file name */
736 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
737 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
738 } redirect_block;
739
740 /* Structure for passing arguments to check_host() */
741
742 typedef struct check_host_block {
743 uschar *host_name;
744 uschar *host_address;
745 uschar *host_ipv4;
746 BOOL negative;
747 } check_host_block;
748
749 /* Structure for remembering lookup data when caching the result of
750 a lookup in a named list. */
751
752 typedef struct namedlist_cacheblock {
753 struct namedlist_cacheblock *next;
754 uschar *key;
755 uschar *data;
756 } namedlist_cacheblock;
757
758 /* Structure for holding data for an entry in a named list */
759
760 typedef struct namedlist_block {
761 uschar *string; /* the list string */
762 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
763 int number; /* the number of the list for caching */
764 } namedlist_block;
765
766 /* Structures for Access Control Lists */
767
768 typedef struct acl_condition_block {
769 struct acl_condition_block *next;
770 uschar *arg;
771 int type;
772 union {
773 BOOL negated;
774 int varnumber;
775 } u;
776 } acl_condition_block;
777
778 typedef struct acl_block {
779 struct acl_block *next;
780 acl_condition_block *condition;
781 int verb;
782 } acl_block;
783
784 /* End of structs.h */