1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
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;
29 typedef struct gstring {
30 int size; /* Current capacity of string memory */
31 int ptr; /* Offset at which to append further chars */
32 uschar * s; /* The string memory */
35 /* Structure for remembering macros for the configuration file */
37 typedef struct macro_item {
38 struct macro_item * next;
43 const uschar * replacement;
46 /* Structure for bit tables for debugging and logging */
48 typedef struct bit_table {
53 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
55 typedef struct ugid_block {
63 typedef enum { CHUNKING_NOT_OFFERED = -1,
66 CHUNKING_LAST} chunking_state_t;
68 typedef enum { TFO_NOT_USED = 0,
70 TFO_USED } tfo_state_t;
72 /* Structure for holding information about a host for use mainly by routers,
73 but also used when checking lists of hosts and when transporting. Looking up
74 host addresses is done using this structure. */
76 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
78 typedef struct host_item {
79 struct host_item *next;
80 const uschar *name; /* Host name */
81 const uschar *address; /* IP address in text form */
82 int port; /* port value in host order (if SRV lookup) */
83 int mx; /* MX value if found via MX records */
84 int sort_key; /* MX*1000 plus random "fraction" */
85 int status; /* Usable, unusable, or unknown */
86 int why; /* Why host is unusable */
87 int last_try; /* Time of last try if known */
88 dnssec_status_t dnssec;
91 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
92 rewrite_headers field of a transport. */
94 typedef struct rewrite_rule {
95 struct rewrite_rule *next;
101 /* This structure is used to pass back configuration data from the smtp
102 transport to the outside world. It is used during callback processing. If ever
103 another remote transport were implemented, it could use the same structure. */
105 typedef struct transport_feedback {
112 BOOL hosts_randomize;
116 } transport_feedback;
118 /* Routers, transports, and authenticators have similar data blocks. Each
119 driver that is compiled into the code is represented by a xxx_info block; the
120 active drivers are represented by a chain of xxx_instance blocks. To make it
121 possible to use the same code for reading the configuration files for all
122 three, the layout of the start of the blocks is kept the same, and represented
123 by the generic structures driver_info and driver_instance. */
125 typedef struct driver_instance {
126 struct driver_instance *next;
127 uschar *name; /* Instance name */
128 struct driver_info *info; /* Points to info for this driver */
129 void *options_block; /* Pointer to private options */
130 uschar *driver_name; /* All start with this generic option */
133 typedef struct driver_info {
134 uschar *driver_name; /* Name of driver */
135 optionlist *options; /* Table of private options names */
136 int *options_count; /* -> Number of entries in table */
137 void *options_block; /* Points to default private block */
138 int options_len; /* Length of same in bytes */
139 void (*init)( /* Initialization entry point */
140 struct driver_instance *);
144 /* Structure for holding information about the configured transports. Some
145 of the generally accessible options are set from the configuration file; others
146 are set by transport initialization, since they can only be set for certain
147 transports. They need to be generally accessible, however, as they are used by
148 the main transport code. */
150 typedef struct transport_instance {
151 struct transport_instance *next;
152 uschar *name; /* Instance name */
153 struct transport_info *info; /* Info for this driver */
154 void *options_block; /* Pointer to private options */
155 uschar *driver_name; /* Must be first */
156 int (*setup)( /* Setup entry point */
157 struct transport_instance *,
158 struct address_item *,
159 struct transport_feedback *, /* For passing back config data */
160 uid_t, /* The uid that will be used */
161 gid_t, /* The gid that will be used */
162 uschar **); /* For an error message */
163 /**************************************/
164 int batch_max; /* ) */
165 uschar *batch_id; /* ) */
166 uschar *home_dir; /* ) Used only for local transports */
167 uschar *current_dir; /* ) */
168 /**************************************/
169 uschar *expand_multi_domain; /* ) */
170 BOOL multi_domain; /* ) */
171 BOOL overrides_hosts; /* ) Used only for remote transports */
172 int max_addresses; /* ) */
173 int connection_max_messages;/* ) */
174 /**************************************/
175 BOOL deliver_as_creator; /* Used only by pipe at present */
176 BOOL disable_logging; /* For very weird requirements */
177 BOOL initgroups; /* Initialize groups when setting uid */
178 BOOL uid_set; /* uid is set */
179 BOOL gid_set; /* gid is set */
182 uschar *expand_uid; /* Variable uid */
183 uschar *expand_gid; /* Variable gid */
184 uschar *warn_message; /* Used only by appendfile at present */
185 uschar *shadow; /* Name of shadow transport */
186 uschar *shadow_condition; /* Condition for running it */
187 uschar *filter_command; /* For on-the-fly-filtering */
188 uschar *add_headers; /* Add these headers */
189 uschar *remove_headers; /* Remove these headers */
190 uschar *return_path; /* Overriding (rewriting) return path */
191 uschar *debug_string; /* Debugging output */
192 uschar *max_parallel; /* Number of concurrent instances */
193 uschar *message_size_limit; /* Biggest message this transport handles */
194 uschar *headers_rewrite; /* Rules for rewriting headers */
195 rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
196 int rewrite_existflags; /* Bits showing which headers are rewritten */
197 int filter_timeout; /* For transport filter timing */
198 BOOL body_only; /* Deliver only the body */
199 BOOL delivery_date_add; /* Add Delivery-Date header */
200 BOOL envelope_to_add; /* Add Envelope-To header */
201 BOOL headers_only; /* Deliver only the headers */
202 BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */
203 BOOL return_path_add; /* Add Return-Path header */
204 BOOL return_output; /* TRUE if output should always be returned */
205 BOOL return_fail_output; /* ditto, but only on failure */
206 BOOL log_output; /* Similarly for logging */
207 BOOL log_fail_output;
208 BOOL log_defer_output;
209 BOOL retry_use_local_part; /* Defaults true for local, false for remote */
210 #ifndef DISABLE_EVENT
211 uschar *event_action; /* String to expand on notable events */
213 } transport_instance;
216 /* Structure for holding information about a type of transport. The first six
217 fields must match driver_info above. */
219 typedef struct transport_info {
220 uschar *driver_name; /* Driver name */
221 optionlist *options; /* Table of private options names */
222 int *options_count; /* -> Number of entries in table */
223 void *options_block; /* Points to default private block */
224 int options_len; /* Length of same in bytes */
225 void (*init)( /* Initialization function */
226 struct transport_instance *);
228 BOOL (*code)( /* Main entry point */
229 transport_instance *,
230 struct address_item *);
231 void (*tidyup)( /* Tidyup function */
232 struct transport_instance *);
233 void (*closedown)( /* For closing down a passed channel */
234 struct transport_instance *);
235 BOOL local; /* TRUE for local transports */
239 /* smtp transport datachunk callback */
241 #define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */
242 #define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */
244 struct transport_context;
245 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
247 /* Structure for information about a delivery-in-progress */
249 typedef struct transport_context {
250 union { /* discriminated by option topt_output_string */
251 int fd; /* file descriptor to write message to */
252 gstring * msg; /* allocated string with written message */
254 transport_instance * tblock; /* transport */
255 struct address_item * addr;
256 uschar * check_string; /* string replacement */
257 uschar * escape_string;
258 int options; /* output processing topt_* */
260 /* items below only used with option topt_use_bdat */
261 tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */
272 /* Structure for holding information about the configured routers. */
274 typedef struct router_instance {
275 struct router_instance *next;
277 struct router_info *info;
278 void *options_block; /* Pointer to private options */
279 uschar *driver_name; /* Must be first */
281 uschar *address_data; /* Arbitrary data */
282 #ifdef EXPERIMENTAL_BRIGHTMAIL
283 uschar *bmi_rule; /* Brightmail AntiSpam rule checking */
285 uschar *cannot_route_message; /* Used when routing fails */
286 uschar *condition; /* General condition */
287 uschar *current_directory; /* For use during delivery */
288 uschar *debug_string; /* Debugging output */
289 uschar *domains; /* Specific domains */
290 uschar *errors_to; /* Errors address */
291 uschar *expand_gid; /* Expanded gid string */
292 uschar *expand_uid; /* Expanded uid string */
293 uschar *expand_more; /* Expanded more string */
294 uschar *expand_unseen; /* Expanded unseen string */
295 uschar *extra_headers; /* Additional headers */
296 uschar *fallback_hosts; /* For remote transports (text list) */
297 uschar *home_directory; /* For use during delivery */
298 uschar *ignore_target_hosts; /* Target hosts to ignore */
299 uschar *local_parts; /* Specific local parts */
300 uschar *pass_router_name; /* Router for passed address */
301 uschar *prefix; /* Address prefix */
302 uschar *redirect_router_name; /* Router for generated address */
303 uschar *remove_headers; /* Removed headers */
304 uschar *require_files; /* File checks before router is run */
305 uschar *router_home_directory; /* For use while routing */
306 uschar *self; /* Text option for handling self reference */
307 uschar *senders; /* Specific senders */
308 uschar *suffix; /* Address suffix */
309 uschar *translate_ip_address; /* IP address translation fudgery */
310 uschar *transport_name; /* Transport name */
312 BOOL address_test; /* Use this router when testing addresses */
313 #ifdef EXPERIMENTAL_BRIGHTMAIL
314 BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */
315 BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */
316 BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */
318 BOOL expn; /* Use this router when processing EXPN */
319 BOOL caseful_local_part; /* TRUE => don't lowercase */
320 BOOL check_local_user; /* TRUE => check local user */
321 BOOL disable_logging; /* For very weird requirements */
322 BOOL fail_verify_recipient; /* Fail verify if recipient match this router */
323 BOOL fail_verify_sender; /* Fail verify if sender match this router */
324 BOOL gid_set; /* Flag to indicate gid is set */
325 BOOL initgroups; /* TRUE if initgroups is required */
326 BOOL log_as_local; /* TRUE logs as a local delivery */
327 BOOL more; /* If FALSE, do no more if this one fails */
328 BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */
329 BOOL prefix_optional; /* Just what it says */
330 BOOL repeat_use; /* If FALSE, skip if ancestor used it */
331 BOOL retry_use_local_part; /* Just what it says */
332 BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */
333 BOOL self_rewrite; /* TRUE to rewrite headers if making local */
334 BOOL suffix_optional; /* As it says */
335 BOOL verify_only; /* Skip this router if not verifying */
336 BOOL verify_recipient; /* Use this router when verifying a recipient*/
337 BOOL verify_sender; /* Use this router when verifying a sender */
338 BOOL uid_set; /* Flag to indicate uid is set */
339 BOOL unseen; /* If TRUE carry on, even after success */
340 BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */
342 int self_code; /* Encoded version of "self" */
343 uid_t uid; /* Fixed uid value */
344 gid_t gid; /* Fixed gid value */
346 host_item *fallback_hostlist; /* For remote transport (block chain) */
347 transport_instance *transport; /* Transport block (when found) */
348 struct router_instance *pass_router; /* Actual router for passed address */
349 struct router_instance *redirect_router; /* Actual router for generated address */
351 dnssec_domains dnssec;
355 /* Structure for holding information about a type of router. The first six
356 fields must match driver_info above. */
358 typedef struct router_info {
360 optionlist *options; /* Table of private options names */
361 int *options_count; /* -> Number of entries in table */
362 void *options_block; /* Points to default private block */
363 int options_len; /* Length of same in bytes */
364 void (*init)( /* Initialization function */
365 struct router_instance *);
367 int (*code)( /* Main entry point */
369 struct address_item *,
372 struct address_item **,
373 struct address_item **,
374 struct address_item **,
375 struct address_item **);
376 void (*tidyup)( /* Tidyup function */
377 struct router_instance *);
378 int ri_flags; /* Descriptive flags */
382 /* Structure for holding information about a lookup type. */
384 #include "lookupapi.h"
387 /* Structure for holding information about the configured authentication
390 typedef struct auth_instance {
391 struct auth_instance *next;
392 uschar *name; /* Exim instance name */
393 struct auth_info *info; /* Pointer to driver info block */
394 void *options_block; /* Pointer to private options */
395 uschar *driver_name; /* Must be first */
396 uschar *advertise_condition; /* Are we going to advertise this?*/
397 uschar *client_condition; /* Should the client try this? */
398 uschar *public_name; /* Advertised name */
399 uschar *set_id; /* String to set when server as authenticated id */
400 uschar *set_client_id; /* String to set when client as client_authenticated id */
401 uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */
402 uschar *server_debug_string; /* Debugging output */
403 uschar *server_condition; /* Authorization condition */
404 BOOL client; /* TRUE if client option(s) set */
405 BOOL server; /* TRUE if server options(s) set */
406 BOOL advertised; /* Set TRUE when advertised */
410 /* Structure for holding information about an authentication mechanism. The
411 first six fields must match driver_info above. */
413 typedef struct auth_info {
414 uschar *driver_name; /* e.g. "condition" */
415 optionlist *options; /* Table of private options names */
416 int *options_count; /* -> Number of entries in table */
417 void *options_block; /* Points to default private block */
418 int options_len; /* Length of same in bytes */
419 void (*init)( /* initialization function */
420 struct auth_instance *);
422 int (*servercode)( /* server function */
423 auth_instance *, /* the instance data */
424 uschar *); /* rest of AUTH command */
425 int (*clientcode)( /* client function */
426 struct auth_instance *,
427 void *, /* smtp conn, with socket, output and input buffers */
428 int, /* command timeout */
429 uschar *, /* buffer for reading response */
430 int); /* sizeof buffer */
431 void (*version_report)( /* diagnostic version reporting */
432 FILE *); /* I/O stream to print to */
436 /* Structure for holding a single IP address and port; used for the chain of
437 addresses and ports for the local host. Make the char string large enough to
438 hold an IPv6 address. */
440 typedef struct ip_address_item {
441 struct ip_address_item *next;
443 BOOL v6_include_v4; /* Used in the daemon */
447 /* Structure for chaining together arbitrary strings. */
449 typedef struct string_item {
450 struct string_item *next;
454 /* Information about a soft delivery failure, for use when calculating
455 retry information. It's separate from the address block, because there
456 can be a chain of them for SMTP deliveries where multiple IP addresses
459 typedef struct retry_item {
460 struct retry_item *next; /* for chaining */
461 uschar *key; /* string identifying host/address/message */
462 int basic_errno; /* error code for this destination */
463 int more_errno; /* additional error information */
464 uschar *message; /* local error message */
465 int flags; /* see below */
468 /* Retry data flags */
470 #define rf_delete 0x0001 /* retry info is to be deleted */
471 #define rf_host 0x0002 /* retry info is for a remote host */
472 #define rf_message 0x0004 /* retry info is for a host+message */
474 /* Information about a constructed message that is to be sent using the
475 autoreply transport. This is pointed to from the address block. */
477 typedef struct reply_item {
478 uschar *from; /* ) */
479 uschar *reply_to; /* ) */
481 uschar *cc; /* ) specific header fields */
483 uschar *subject; /* ) */
484 uschar *headers; /* misc other headers, concatenated */
485 uschar *text; /* text string body */
486 uschar *file; /* file body */
487 BOOL file_expand; /* expand the body */
488 int expand_forbid; /* expansion lockout flags */
489 uschar *logfile; /* file to keep a log in */
490 uschar *oncelog; /* file to keep records in for once only */
491 time_t once_repeat; /* time to repeat "once only" */
492 BOOL return_message; /* send back the original message */
496 /* The address_item structure contains many fields which are used at various
497 times while delivering a message. Some are used only for remote deliveries;
498 some only for local. A particular set of fields is copied whenever a child
499 address is created. For convenience, we keep those fields in a separate
500 sub-structure so they can be copied in one go. This also means I won't forget
501 to edit the various copying places when new to-be-copied fields are added. */
503 typedef struct address_item_propagated {
504 uschar *address_data; /* arbitrary data to keep with the address */
505 uschar *domain_data; /* from "domains" lookup */
506 uschar *localpart_data; /* from "local_parts" lookup */
507 uschar *errors_address; /* where to send errors (NULL => sender) */
508 header_line *extra_headers; /* additional headers */
509 uschar *remove_headers; /* list of those to remove */
511 #ifdef EXPERIMENTAL_SRS
512 uschar *srs_sender; /* Change return path when delivering */
514 BOOL ignore_error:1; /* ignore delivery error */
516 BOOL utf8_msg:1; /* requires SMTPUTF8 processing */
517 BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */
518 BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */
520 } address_item_propagated;
523 /* The main address structure. Note that fields that are to be copied to
524 generated addresses should be put in the address_item_propagated structure (see
525 above) rather than directly into the address_item structure. */
527 typedef struct address_item {
528 struct address_item *next; /* for chaining addresses */
529 struct address_item *parent; /* parent address */
530 struct address_item *first; /* points to first after group delivery */
531 struct address_item *dupof; /* points to address this is a duplicate of */
533 router_instance *start_router; /* generated address starts here */
534 router_instance *router; /* the router that routed */
535 transport_instance *transport; /* the transport to use */
537 host_item *host_list; /* host data for the transport */
538 host_item *host_used; /* host that took delivery or failed hard */
539 host_item *fallback_hosts; /* to try if delivery defers */
541 reply_item *reply; /* data for autoreply */
542 retry_item *retries; /* chain of retry information */
544 uschar *address; /* address being delivered or routed */
545 uschar *unique; /* used for disambiguating */
546 uschar *cc_local_part; /* caseful local part */
547 uschar *lc_local_part; /* lowercased local part */
548 uschar *local_part; /* points to cc or lc version */
549 uschar *prefix; /* stripped prefix of local part */
550 uschar *suffix; /* stripped suffix of local part */
551 const uschar *domain; /* working domain (lower cased) */
553 uschar *address_retry_key; /* retry key including full address */
554 uschar *domain_retry_key; /* retry key for domain only */
556 uschar *current_dir; /* current directory for transporting */
557 uschar *home_dir; /* home directory for transporting */
558 uschar *message; /* error message */
559 uschar *user_message; /* error message that can be sent over SMTP
560 or quoted in bounce message */
561 uschar *onetime_parent; /* saved original parent for onetime */
562 uschar **pipe_expandn; /* numeric expansions for pipe from filter */
563 uschar *return_filename; /* name of return file */
564 uschar *self_hostname; /* after self=pass */
565 uschar *shadow_message; /* info about shadow transporting */
568 uschar *cipher; /* Cipher used for transport */
569 void *ourcert; /* Certificate offered to peer, binary */
570 void *peercert; /* Certificate from peer, binary */
571 uschar *peerdn; /* DN of server's certificate */
572 int ocsp; /* OCSP status of peer cert */
575 #ifdef EXPERIMENTAL_DSN_INFO
576 const uschar *smtp_greeting; /* peer self-identification */
577 const uschar *helo_response; /* peer message */
580 uschar *authenticator; /* auth driver name used by transport */
581 uschar *auth_id; /* auth "login" name used by transport */
582 uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */
584 uschar *dsn_orcpt; /* DSN orcpt value */
585 int dsn_flags; /* DSN flags */
586 int dsn_aware; /* DSN aware flag */
588 uid_t uid; /* uid for transporting */
589 gid_t gid; /* gid for transporting */
593 BOOL af_allow_file:1; /* allow file in generated address */
594 BOOL af_allow_pipe:1; /* allow pipe in generated address */
595 BOOL af_allow_reply:1; /* allow autoreply in generated address */
596 BOOL af_dr_retry_exists:1; /* router retry record exists */
597 BOOL af_expand_pipe:1; /* expand pipe arguments */
598 BOOL af_file:1; /* file delivery; always with pfr */
599 BOOL af_gid_set:1; /* gid field is set */
600 BOOL af_home_expanded:1; /* home_dir is already expanded */
601 BOOL af_initgroups:1; /* use initgroups() for local transporting */
602 BOOL af_local_host_removed:1; /* local host was backup */
603 BOOL af_lt_retry_exists:1; /* local transport retry exists */
604 BOOL af_pfr:1; /* pipe or file or reply delivery */
605 BOOL af_retry_skipped:1; /* true if retry caused some skipping */
606 BOOL af_retry_timedout:1; /* true if retry timed out */
607 BOOL af_uid_set:1; /* uid field is set */
608 BOOL af_hide_child:1; /* hide child in bounce/defer msgs */
609 BOOL af_sverify_told:1; /* sender verify failure notified */
610 BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */
611 BOOL af_verify_nsfail:1; /* verify failure was null sender callout */
612 BOOL af_homonym:1; /* an ancestor has same address */
613 BOOL af_verify_routed:1; /* for cached sender verify: routed OK */
614 BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */
615 BOOL af_include_affixes:1; /* delivered with affixes in RCPT */
616 BOOL af_cert_verified:1; /* delivered with verified TLS cert */
617 BOOL af_pass_message:1; /* pass message in bounces */
618 BOOL af_bad_reply:1; /* filter could not generate autoreply */
619 BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */
620 BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
621 BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
623 BOOL af_prdr_used:1; /* delivery used SMTP PRDR */
625 BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */
626 BOOL af_force_command:1; /* force_command in pipe transport */
628 BOOL af_dane_verified:1; /* TLS cert verify done with DANE */
631 BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */
635 unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
636 unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
637 int mode; /* mode for local transporting to a file */
638 int more_errno; /* additional error information */
639 /* (may need to hold a timestamp) */
640 unsigned int delivery_usec; /* subsecond part of delivery time */
642 short int basic_errno; /* status after failure */
643 unsigned short child_count; /* number of child addresses */
644 short int return_file; /* fileno of return data file */
645 short int special_action; /* ( used when when deferred or failed */
647 /* ( contains = or - when successful SMTP delivered */
649 /* ( contains verify rc in sender verify cache */
650 short int transport_return; /* result of delivery attempt */
651 address_item_propagated prop; /* fields that are propagated to children */
654 /* The table of header names consists of items of this type */
663 /* Chain of information about errors (e.g. bad addresses) */
665 typedef struct error_block {
666 struct error_block *next;
671 /* Chain of file names when processing the queue */
673 typedef struct queue_filename {
674 struct queue_filename *next;
679 /* Chain of items of retry information, read from the retry config. */
681 typedef struct retry_rule {
682 struct retry_rule *next;
689 typedef struct retry_config {
690 struct retry_config *next;
698 /* Structure for each node in a tree, of which there are various kinds */
700 typedef struct tree_node {
701 struct tree_node *left; /* pointer to left child */
702 struct tree_node *right; /* pointer to right child */
705 void *ptr; /* pointer to data */
706 int val; /* or integer data */
708 uschar balance; /* balancing factor */
709 uschar name[1]; /* node name - variable length */
712 /* Structure for holding time-limited data such as DNS returns.
713 We use this rather than extending tree_node to avoid wasting
714 space for most tree use (variables...) at the cost of complexity
715 for the lookups cache */
717 typedef struct expiring_data {
718 time_t expiry; /* if nonzero, data invalid after this time */
719 void *ptr; /* pointer to data */
722 /* Structure for holding the handle and the cached last lookup for searches.
723 This block is pointed to by the tree entry for the file. The file can get
724 closed if too many are opened at once. There is a LRU chain for deciding which
727 typedef struct search_cache {
728 void *handle; /* lookup handle, or NULL if closed */
729 int search_type; /* search type */
730 tree_node *up; /* LRU up pointer */
731 tree_node *down; /* LRU down pointer */
732 tree_node *item_cache; /* tree of cached results */
735 /* Structure for holding a partially decoded DNS record; the name has been
736 uncompressed, but the data pointer is into the raw data. */
739 uschar name[DNS_MAXNAME]; /* domain name */
740 int type; /* record type */
741 unsigned short ttl; /* time-to-live, seconds */
742 int size; /* size of data */
743 const uschar *data; /* pointer to data */
746 /* Structure for holding the result of a DNS query. A touch over
747 64k big, so take care to release as soon as possible. */
750 int answerlen; /* length of the answer */
751 uschar answer[NS_MAXMSG]; /* the answer itself */
754 /* Structure for holding the intermediate data while scanning a DNS answer
758 int rrcount; /* count of RRs in the answer */
759 const uschar *aptr; /* pointer in the answer while scanning */
760 dns_record srr; /* data from current record in scan */
763 /* Structure for holding a chain of IP addresses that are extracted from
764 an A, AAAA, or A6 record. For the first two, there is only ever one address,
765 but the chaining feature of A6 allows for several addresses to be realized from
766 a single initial A6 record. The structure defines the address field of length
767 1. In use, a suitable sized block is obtained to hold the complete textual
770 typedef struct dns_address {
771 struct dns_address *next;
775 /* Structure used for holding intermediate data during MD5 computations. */
779 unsigned int abcd[4];
783 /* Structure used for holding intermediate data during SHA-1 computations. */
785 typedef struct sha1 {
790 /* A client-initiated connection. If TLS, the second element is non-NULL */
797 /* Structure used to hold incoming packets of SMTP responses for a specific
798 socket. The packets which may contain multiple lines (and in some cases,
799 multiple responses). */
801 typedef struct smtp_inblock {
802 client_conn_ctx * cctx; /* the connection */
803 int buffersize; /* the size of the buffer */
804 uschar *ptr; /* current position in the buffer */
805 uschar *ptrend; /* end of data in the buffer */
806 uschar *buffer; /* the buffer itself */
809 /* Structure used to hold buffered outgoing packets of SMTP commands for a
810 specific socket. The packets which may contain multiple lines when pipelining
813 typedef struct smtp_outblock {
814 client_conn_ctx * cctx; /* the connection */
815 int cmd_count; /* count of buffered commands */
816 int buffersize; /* the size of the buffer */
817 BOOL authenticating; /* TRUE when authenticating */
818 uschar *ptr; /* current position in the buffer */
819 uschar *buffer; /* the buffer itself */
822 /* Structure to hold information about the source of redirection information */
824 typedef struct redirect_block {
825 uschar *string; /* file name or string */
826 uid_t *owners; /* allowed file owners */
827 gid_t *owngroups; /* allowed file groups */
828 struct passwd *pw; /* possible owner if not NULL */
829 int modemask; /* forbidden bits */
830 BOOL isfile; /* TRUE if string is a file name */
831 BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */
832 BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */
835 /* Structure for passing arguments to check_host() */
837 typedef struct check_host_block {
838 const uschar *host_name;
839 const uschar *host_address;
840 const uschar *host_ipv4;
844 /* Structure for remembering lookup data when caching the result of
845 a lookup in a named list. */
847 typedef struct namedlist_cacheblock {
848 struct namedlist_cacheblock *next;
851 } namedlist_cacheblock;
853 /* Structure for holding data for an entry in a named list */
855 typedef struct namedlist_block {
856 const uschar *string; /* the list string */
857 namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */
858 int number; /* the number of the list for caching */
861 /* Structures for Access Control Lists */
863 typedef struct acl_condition_block {
864 struct acl_condition_block *next;
871 } acl_condition_block;
873 typedef struct acl_block {
874 struct acl_block *next;
875 acl_condition_block *condition;
879 /* smtp transport calc outbound_ip */
880 typedef BOOL (*oicf) (uschar *message_id, void *data);
882 /* DKIM information for transport */
885 uschar *dkim_identity;
886 uschar *dkim_private_key;
887 uschar *dkim_selector;
889 uschar *dkim_sign_headers;
892 uschar *dkim_timestamps;
895 #ifdef EXPERIMENTAL_ARC
896 uschar *arc_signspec;
900 /* End of structs.h */