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;
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 enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
60 typedef struct host_item {
61 struct host_item *next;
62 const uschar *name; /* Host name */
63 const 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 dnssec_status_t dnssec;
73 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
74 rewrite_headers field of a transport. */
76 typedef struct rewrite_rule {
77 struct rewrite_rule *next;
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. */
87 typedef struct transport_feedback {
100 /* Routers, transports, and authenticators have similar data blocks. Each
101 driver that is compiled into the code is represented by a xxx_info block; the
102 active drivers are represented by a chain of xxx_instance blocks. To make it
103 possible to use the same code for reading the configuration files for all
104 three, the layout of the start of the blocks is kept the same, and represented
105 by the generic structures driver_info and driver_instance. */
107 typedef struct driver_instance {
108 struct driver_instance *next;
109 uschar *name; /* Instance name */
110 struct driver_info *info; /* Points to info for this driver */
111 void *options_block; /* Pointer to private options */
112 uschar *driver_name; /* All start with this generic option */
115 typedef struct driver_info {
116 uschar *driver_name; /* Name of driver */
117 optionlist *options; /* Table of private options names */
118 int *options_count; /* -> Number of entries in table */
119 void *options_block; /* Points to default private block */
120 int options_len; /* Length of same in bytes */
121 void (*init)( /* Initialization entry point */
122 struct driver_instance *);
126 /* Structure for holding information about the configured transports. Some
127 of the generally accessible options are set from the configuration file; others
128 are set by transport initialization, since they can only be set for certain
129 transports. They need to be generally accessible, however, as they are used by
130 the main transport code. */
132 typedef struct transport_instance {
133 struct transport_instance *next;
134 uschar *name; /* Instance name */
135 struct transport_info *info; /* Info for this driver */
136 void *options_block; /* Pointer to private options */
137 uschar *driver_name; /* Must be first */
138 int (*setup)( /* Setup entry point */
139 struct transport_instance *,
140 struct address_item *,
141 struct transport_feedback *, /* For passing back config data */
142 uid_t, /* The uid that will be used */
143 gid_t, /* The gid that will be used */
144 uschar **); /* For an error message */
145 /**************************************/
146 int batch_max; /* ) */
147 uschar *batch_id; /* ) */
148 uschar *home_dir; /* ) Used only for local transports */
149 uschar *current_dir; /* ) */
150 /**************************************/
151 uschar *expand_multi_domain; /* ) */
152 BOOL multi_domain; /* ) */
153 BOOL overrides_hosts; /* ) Used only for remote transports */
154 int max_addresses; /* ) */
155 int connection_max_messages;/* ) */
156 /**************************************/
157 BOOL deliver_as_creator; /* Used only by pipe at present */
158 BOOL disable_logging; /* For very weird requirements */
159 BOOL initgroups; /* Initialize groups when setting uid */
160 BOOL uid_set; /* uid is set */
161 BOOL gid_set; /* gid is set */
164 uschar *expand_uid; /* Variable uid */
165 uschar *expand_gid; /* Variable gid */
166 uschar *warn_message; /* Used only by appendfile at present */
167 uschar *shadow; /* Name of shadow transport */
168 uschar *shadow_condition; /* Condition for running it */
169 uschar *filter_command; /* For on-the-fly-filtering */
170 uschar *add_headers; /* Add these headers */
171 uschar *remove_headers; /* Remove these headers */
172 uschar *return_path; /* Overriding (rewriting) return path */
173 uschar *debug_string; /* Debugging output */
174 uschar *message_size_limit; /* Biggest message this transport handles */
175 uschar *headers_rewrite; /* Rules for rewriting headers */
176 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
177 int rewrite_existflags; /* Bits showing which headers are rewritten */
178 int filter_timeout; /* For transport filter timing */
179 BOOL body_only; /* Deliver only the body */
180 BOOL delivery_date_add; /* Add Delivery-Date header */
181 BOOL envelope_to_add; /* Add Envelope-To header */
182 BOOL headers_only; /* Deliver only the headers */
183 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
184 BOOL return_path_add; /* Add Return-Path header */
185 BOOL return_output; /* TRUE if output should always be returned */
186 BOOL return_fail_output; /* ditto, but only on failure */
187 BOOL log_output; /* Similarly for logging */
188 BOOL log_fail_output;
189 BOOL log_defer_output;
190 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
191 #ifdef EXPERIMENTAL_EVENT
192 uschar *event_action; /* String to expand on notable events */
194 } transport_instance;
197 /* Structure for holding information about a type of transport. The first six
198 fields must match driver_info above. */
200 typedef struct transport_info {
201 uschar *driver_name; /* Driver name */
202 optionlist *options; /* Table of private options names */
203 int *options_count; /* -> Number of entries in table */
204 void *options_block; /* Points to default private block */
205 int options_len; /* Length of same in bytes */
206 void (*init)( /* Initialization function */
207 struct transport_instance *);
209 BOOL (*code)( /* Main entry point */
210 transport_instance *,
211 struct address_item *);
212 void (*tidyup)( /* Tidyup function */
213 struct transport_instance *);
214 void (*closedown)( /* For closing down a passed channel */
215 struct transport_instance *);
216 BOOL local; /* TRUE for local transports */
226 /* Structure for holding information about the configured routers. */
228 typedef struct router_instance {
229 struct router_instance *next;
231 struct router_info *info;
232 void *options_block; /* Pointer to private options */
233 uschar *driver_name; /* Must be first */
235 uschar *address_data; /* Arbitrary data */
236 #ifdef EXPERIMENTAL_BRIGHTMAIL
237 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
239 uschar *cannot_route_message; /* Used when routing fails */
240 uschar *condition; /* General condition */
241 uschar *current_directory; /* For use during delivery */
242 uschar *debug_string; /* Debugging output */
243 uschar *domains; /* Specific domains */
244 uschar *errors_to; /* Errors address */
245 uschar *expand_gid; /* Expanded gid string */
246 uschar *expand_uid; /* Expanded uid string */
247 uschar *expand_more; /* Expanded more string */
248 uschar *expand_unseen; /* Expanded unseen string */
249 uschar *extra_headers; /* Additional headers */
250 uschar *fallback_hosts; /* For remote transports (text list) */
251 uschar *home_directory; /* For use during delivery */
252 uschar *ignore_target_hosts; /* Target hosts to ignore */
253 uschar *local_parts; /* Specific local parts */
254 uschar *pass_router_name; /* Router for passed address */
255 uschar *prefix; /* Address prefix */
256 uschar *redirect_router_name; /* Router for generated address */
257 uschar *remove_headers; /* Removed headers */
258 uschar *require_files; /* File checks before router is run */
259 uschar *router_home_directory; /* For use while routing */
260 uschar *self; /* Text option for handling self reference */
261 uschar *senders; /* Specific senders */
262 uschar *suffix; /* Address suffix */
263 uschar *translate_ip_address; /* IP address translation fudgery */
264 uschar *transport_name; /* Transport name */
266 BOOL address_test; /* Use this router when testing addresses */
267 #ifdef EXPERIMENTAL_BRIGHTMAIL
268 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
269 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
270 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
272 BOOL expn; /* Use this router when processing EXPN */
273 BOOL caseful_local_part; /* TRUE => don't lowercase */
274 BOOL check_local_user; /* TRUE => check local user */
275 BOOL disable_logging; /* For very weird requirements */
276 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
277 BOOL fail_verify_sender; /* Fail verify if sender match this router */
278 BOOL gid_set; /* Flag to indicate gid is set */
279 BOOL initgroups; /* TRUE if initgroups is required */
280 BOOL log_as_local; /* TRUE logs as a local delivery */
281 BOOL more; /* If FALSE, do no more if this one fails */
282 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
283 BOOL prefix_optional; /* Just what it says */
284 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
285 BOOL retry_use_local_part; /* Just what it says */
286 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
287 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
288 BOOL suffix_optional; /* As it says */
289 BOOL verify_only; /* Skip this router if not verifying */
290 BOOL verify_recipient; /* Use this router when verifying a recipient*/
291 BOOL verify_sender; /* Use this router when verifying a sender */
292 BOOL uid_set; /* Flag to indicate uid is set */
293 BOOL unseen; /* If TRUE carry on, even after success */
294 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
296 int self_code; /* Encoded version of "self" */
297 uid_t uid; /* Fixed uid value */
298 gid_t gid; /* Fixed gid value */
300 host_item *fallback_hostlist; /* For remote transport (block chain) */
301 transport_instance *transport; /* Transport block (when found) */
302 struct router_instance *pass_router; /* Actual router for passed address */
303 struct router_instance *redirect_router; /* Actual router for generated address */
305 dnssec_domains dnssec;
309 /* Structure for holding information about a type of router. The first six
310 fields must match driver_info above. */
312 typedef struct router_info {
314 optionlist *options; /* Table of private options names */
315 int *options_count; /* -> Number of entries in table */
316 void *options_block; /* Points to default private block */
317 int options_len; /* Length of same in bytes */
318 void (*init)( /* Initialization function */
319 struct router_instance *);
321 int (*code)( /* Main entry point */
323 struct address_item *,
326 struct address_item **,
327 struct address_item **,
328 struct address_item **,
329 struct address_item **);
330 void (*tidyup)( /* Tidyup function */
331 struct router_instance *);
332 int ri_flags; /* Descriptive flags */
336 /* Structure for holding information about a lookup type. */
338 #include "lookupapi.h"
341 /* Structure for holding information about the configured authentication
344 typedef struct auth_instance {
345 struct auth_instance *next;
346 uschar *name; /* Exim instance name */
347 struct auth_info *info; /* Pointer to driver info block */
348 void *options_block; /* Pointer to private options */
349 uschar *driver_name; /* Must be first */
350 uschar *advertise_condition; /* Are we going to advertise this?*/
351 uschar *client_condition; /* Should the client try this? */
352 uschar *public_name; /* Advertised name */
353 uschar *set_id; /* String to set when server as authenticated id */
354 uschar *set_client_id; /* String to set when client as client_authenticated id */
355 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
356 uschar *server_debug_string; /* Debugging output */
357 uschar *server_condition; /* Authorization condition */
358 BOOL client; /* TRUE if client option(s) set */
359 BOOL server; /* TRUE if server options(s) set */
360 BOOL advertised; /* Set TRUE when advertised */
364 /* Structure for holding information about an authentication mechanism. The
365 first six fields must match driver_info above. */
367 typedef struct auth_info {
368 uschar *driver_name; /* e.g. "condition" */
369 optionlist *options; /* Table of private options names */
370 int *options_count; /* -> Number of entries in table */
371 void *options_block; /* Points to default private block */
372 int options_len; /* Length of same in bytes */
373 void (*init)( /* initialization function */
374 struct auth_instance *);
376 int (*servercode)( /* server function */
377 auth_instance *, /* the instance data */
378 uschar *); /* rest of AUTH command */
379 int (*clientcode)( /* client function */
380 struct auth_instance *,
381 struct smtp_inblock *, /* socket and input buffer */
382 struct smtp_outblock *, /* socket and output buffer */
383 int, /* command timeout */
384 uschar *, /* buffer for reading response */
385 int); /* sizeof buffer */
386 void (*version_report)( /* diagnostic version reporting */
387 FILE *); /* I/O stream to print to */
391 /* Structure for holding a single IP address and port; used for the chain of
392 addresses and ports for the local host. Make the char string large enough to
393 hold an IPv6 address. */
395 typedef struct ip_address_item {
396 struct ip_address_item *next;
398 BOOL v6_include_v4; /* Used in the daemon */
402 /* Structure for chaining together arbitrary strings. */
404 typedef struct string_item {
405 struct string_item *next;
409 /* Information about a soft delivery failure, for use when calculating
410 retry information. It's separate from the address block, because there
411 can be a chain of them for SMTP deliveries where multiple IP addresses
414 typedef struct retry_item {
415 struct retry_item *next; /* for chaining */
416 uschar *key; /* string identifying host/address/message */
417 int basic_errno; /* error code for this destination */
418 int more_errno; /* additional error information */
419 uschar *message; /* local error message */
420 int flags; /* see below */
423 /* Retry data flags */
425 #define rf_delete 0x0001 /* retry info is to be deleted */
426 #define rf_host 0x0002 /* retry info is for a remote host */
427 #define rf_message 0x0004 /* retry info is for a host+message */
429 /* Information about a constructed message that is to be sent using the
430 autoreply transport. This is pointed to from the address block. */
432 typedef struct reply_item {
433 uschar *from; /* ) */
434 uschar *reply_to; /* ) */
436 uschar *cc; /* ) specific header fields */
438 uschar *subject; /* ) */
439 uschar *headers; /* misc other headers, concatenated */
440 uschar *text; /* text string body */
441 uschar *file; /* file body */
442 BOOL file_expand; /* expand the body */
443 int expand_forbid; /* expansion lockout flags */
444 uschar *logfile; /* file to keep a log in */
445 uschar *oncelog; /* file to keep records in for once only */
446 time_t once_repeat; /* time to repeat "once only" */
447 BOOL return_message; /* send back the original message */
451 /* The address_item structure contains many fields which are used at various
452 times while delivering a message. Some are used only for remote deliveries;
453 some only for local. A particular set of fields is copied whenever a child
454 address is created. For convenience, we keep those fields in a separate
455 sub-structure so they can be copied in one go. This also means I won't forget
456 to edit the various copying places when new to-be-copied fields are added. */
458 typedef struct address_item_propagated {
459 uschar *address_data; /* arbitrary data to keep with the address */
460 uschar *domain_data; /* from "domains" lookup */
461 uschar *localpart_data; /* from "local_parts" lookup */
462 uschar *errors_address; /* where to send errors (NULL => sender) */
463 header_line *extra_headers; /* additional headers */
464 uschar *remove_headers; /* list of those to remove */
466 #ifdef EXPERIMENTAL_SRS
467 uschar *srs_sender; /* Change return path when delivering */
469 #ifdef EXPERIMENTAL_INTERNATIONAL
470 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
471 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
472 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
474 } address_item_propagated;
476 /* Bits for the flags field below */
478 #define af_allow_file 0x00000001 /* allow file in generated address */
479 #define af_allow_pipe 0x00000002 /* allow pipe in generated address */
480 #define af_allow_reply 0x00000004 /* allow autoreply in generated address */
481 #define af_dr_retry_exists 0x00000008 /* router retry record exists */
482 #define af_expand_pipe 0x00000010 /* expand pipe arguments */
483 #define af_file 0x00000020 /* file delivery; always with pfr */
484 #define af_gid_set 0x00000040 /* gid field is set */
485 #define af_home_expanded 0x00000080 /* home_dir is already expanded */
486 #define af_ignore_error 0x00000100 /* ignore delivery error */
487 #define af_initgroups 0x00000200 /* use initgroups() for local transporting */
488 #define af_local_host_removed 0x00000400 /* local host was backup */
489 #define af_lt_retry_exists 0x00000800 /* local transport retry exists */
490 #define af_pfr 0x00001000 /* pipe or file or reply delivery */
491 #define af_retry_skipped 0x00002000 /* true if retry caused some skipping */
492 #define af_retry_timedout 0x00004000 /* true if retry timed out */
493 #define af_uid_set 0x00008000 /* uid field is set */
494 #define af_hide_child 0x00010000 /* hide child in bounce/defer msgs */
495 #define af_sverify_told 0x00020000 /* sender verify failure notified */
496 #define af_verify_pmfail 0x00040000 /* verify failure was postmaster callout */
497 #define af_verify_nsfail 0x00080000 /* verify failure was null sender callout */
498 #define af_homonym 0x00100000 /* an ancestor has same address */
499 #define af_verify_routed 0x00200000 /* for cached sender verify: routed OK */
500 #define af_verify_callout 0x00400000 /* for cached sender verify: callout was specified */
501 #define af_include_affixes 0x00800000 /* delivered with affixes in RCPT */
502 #define af_cert_verified 0x01000000 /* delivered with verified TLS cert */
503 #define af_pass_message 0x02000000 /* pass message in bounces */
504 #define af_bad_reply 0x04000000 /* filter could not generate autoreply */
506 # define af_prdr_used 0x08000000 /* delivery used SMTP PRDR */
508 #define af_force_command 0x10000000 /* force_command in pipe transport */
509 #ifdef EXPERIMENTAL_DANE
510 # define af_dane_verified 0x20000000 /* TLS cert verify done with DANE */
512 #ifdef EXPERIMENTAL_INTERNATIONAL
513 # define af_utf8_downcvt 0x40000000 /* downconvert was done for delivery */
516 /* These flags must be propagated when a child is created */
518 #define af_propagate (af_ignore_error)
520 /* The main address structure. Note that fields that are to be copied to
521 generated addresses should be put in the address_item_propagated structure (see
522 above) rather than directly into the address_item structure. */
524 typedef struct address_item {
525 struct address_item *next; /* for chaining addresses */
526 struct address_item *parent; /* parent address */
527 struct address_item *first; /* points to first after group delivery */
528 struct address_item *dupof; /* points to address this is a duplicate of */
530 router_instance *start_router; /* generated address starts here */
531 router_instance *router; /* the router that routed */
532 transport_instance *transport; /* the transport to use */
534 host_item *host_list; /* host data for the transport */
535 host_item *host_used; /* host that took delivery or failed hard */
536 host_item *fallback_hosts; /* to try if delivery defers */
538 reply_item *reply; /* data for autoreply */
539 retry_item *retries; /* chain of retry information */
541 uschar *address; /* address being delivered or routed */
542 uschar *unique; /* used for disambiguating */
543 uschar *cc_local_part; /* caseful local part */
544 uschar *lc_local_part; /* lowercased local part */
545 uschar *local_part; /* points to cc or lc version */
546 uschar *prefix; /* stripped prefix of local part */
547 uschar *suffix; /* stripped suffix of local part */
548 const uschar *domain; /* working domain (lower cased) */
550 uschar *address_retry_key; /* retry key including full address */
551 uschar *domain_retry_key; /* retry key for domain only */
553 uschar *current_dir; /* current directory for transporting */
554 uschar *home_dir; /* home directory for transporting */
555 uschar *message; /* error message */
556 uschar *user_message; /* error message that can be sent over SMTP
557 or quoted in bounce message */
558 uschar *onetime_parent; /* saved original parent for onetime */
559 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
560 uschar *return_filename; /* name of return file */
561 uschar *self_hostname; /* after self=pass */
562 uschar *shadow_message; /* info about shadow transporting */
565 uschar *cipher; /* Cipher used for transport */
566 void *ourcert; /* Certificate offered to peer, binary */
567 void *peercert; /* Certificate from peer, binary */
568 uschar *peerdn; /* DN of server's certificate */
569 int ocsp; /* OCSP status of peer cert */
572 #ifdef EXPERIMENTAL_DSN_INFO
573 const uschar *smtp_greeting; /* peer self-identification */
574 const uschar *helo_response; /* peer message */
577 uschar *authenticator; /* auth driver name used by transport */
578 uschar *auth_id; /* auth "login" name used by transport */
579 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
581 uschar *dsn_orcpt; /* DSN orcpt value */
582 int dsn_flags; /* DSN flags */
583 int dsn_aware; /* DSN aware flag */
585 uid_t uid; /* uid for transporting */
586 gid_t gid; /* gid for transporting */
588 unsigned int flags; /* a row of bits, defined above */
589 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
590 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
591 int mode; /* mode for local transporting to a file */
592 int more_errno; /* additional error information */
593 /* (may need to hold a timestamp) */
595 short int basic_errno; /* status after failure */
596 short int child_count; /* number of child addresses */
597 short int return_file; /* fileno of return data file */
598 short int special_action; /* ( used when when deferred or failed */
600 /* ( contains = or - when successful SMTP delivered */
602 /* ( contains verify rc in sender verify cache */
603 short int transport_return; /* result of delivery attempt */
604 address_item_propagated prop; /* fields that are propagated to children */
607 /* The table of header names consists of items of this type */
616 /* Chain of information about errors (e.g. bad addresses) */
618 typedef struct error_block {
619 struct error_block *next;
624 /* Chain of file names when processing the queue */
626 typedef struct queue_filename {
627 struct queue_filename *next;
632 /* Chain of items of retry information, read from the retry config. */
634 typedef struct retry_rule {
635 struct retry_rule *next;
642 typedef struct retry_config {
643 struct retry_config *next;
651 /* Structure for each node in a tree, of which there are various kinds */
653 typedef struct tree_node {
654 struct tree_node *left; /* pointer to left child */
655 struct tree_node *right; /* pointer to right child */
658 void *ptr; /* pointer to data */
659 int val; /* or integer data */
661 uschar balance; /* balancing factor */
662 uschar name[1]; /* node name - variable length */
665 /* Structure for holding the handle and the cached last lookup for searches.
666 This block is pointed to by the tree entry for the file. The file can get
667 closed if too many are opened at once. There is a LRU chain for deciding which
670 typedef struct search_cache {
671 void *handle; /* lookup handle, or NULL if closed */
672 int search_type; /* search type */
673 tree_node *up; /* LRU up pointer */
674 tree_node *down; /* LRU down pointer */
675 tree_node *item_cache; /* tree of cached results */
678 /* Structure for holding a partially decoded DNS record; the name has been
679 uncompressed, but the data pointer is into the raw data. */
682 uschar name[DNS_MAXNAME]; /* domain name */
683 int type; /* record type */
684 int size; /* size of data */
685 uschar *data; /* pointer to data */
688 /* Structure for holding the result of a DNS query. */
691 int answerlen; /* length of the answer */
692 uschar answer[MAXPACKET]; /* the answer itself */
695 /* Structure for holding the intermediate data while scanning a DNS answer
699 int rrcount; /* count of RRs in the answer */
700 uschar *aptr; /* pointer in the answer while scanning */
701 dns_record srr; /* data from current record in scan */
704 /* Structure for holding a chain of IP addresses that are extracted from
705 an A, AAAA, or A6 record. For the first two, there is only ever one address,
706 but the chaining feature of A6 allows for several addresses to be realized from
707 a single initial A6 record. The structure defines the address field of length
708 1. In use, a suitable sized block is obtained to hold the complete textual
711 typedef struct dns_address {
712 struct dns_address *next;
716 /* Structure used for holding intermediate data during MD5 computations. */
720 unsigned int abcd[4];
724 /* Structure used for holding intermediate data during SHA-1 computations. */
726 typedef struct sha1 {
732 /* Structure used to hold incoming packets of SMTP responses for a specific
733 socket. The packets which may contain multiple lines (and in some cases,
734 multiple responses). */
736 typedef struct smtp_inblock {
737 int sock; /* the socket */
738 int buffersize; /* the size of the buffer */
739 uschar *ptr; /* current position in the buffer */
740 uschar *ptrend; /* end of data in the buffer */
741 uschar *buffer; /* the buffer itself */
744 /* Structure used to hold buffered outgoing packets of SMTP commands for a
745 specific socket. The packets which may contain multiple lines when pipelining
748 typedef struct smtp_outblock {
749 int sock; /* the socket */
750 int cmd_count; /* count of buffered commands */
751 int buffersize; /* the size of the buffer */
752 BOOL authenticating; /* TRUE when authenticating */
753 uschar *ptr; /* current position in the buffer */
754 uschar *buffer; /* the buffer itself */
757 /* Structure to hold information about the source of redirection information */
759 typedef struct redirect_block {
760 uschar *string; /* file name or string */
761 uid_t *owners; /* allowed file owners */
762 gid_t *owngroups; /* allowed file groups */
763 struct passwd *pw; /* possible owner if not NULL */
764 int modemask; /* forbidden bits */
765 BOOL isfile; /* TRUE if string is a file name */
766 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
767 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
770 /* Structure for passing arguments to check_host() */
772 typedef struct check_host_block {
773 const uschar *host_name;
774 const uschar *host_address;
775 const uschar *host_ipv4;
779 /* Structure for remembering lookup data when caching the result of
780 a lookup in a named list. */
782 typedef struct namedlist_cacheblock {
783 struct namedlist_cacheblock *next;
786 } namedlist_cacheblock;
788 /* Structure for holding data for an entry in a named list */
790 typedef struct namedlist_block {
791 const uschar *string; /* the list string */
792 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
793 int number; /* the number of the list for caching */
796 /* Structures for Access Control Lists */
798 typedef struct acl_condition_block {
799 struct acl_condition_block *next;
806 } acl_condition_block;
808 typedef struct acl_block {
809 struct acl_block *next;
810 acl_condition_block *condition;
814 /* smtp transport calc outbound_ip */
815 typedef BOOL (*oicf) (uschar *message_id, void *data);
817 /* End of structs.h */