--- /dev/null
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 - 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+/* This header file contains the definitions of the structures used in the
+various hints databases are also kept in this file, which is used by the
+maintenance utilities as well as the main Exim binary. */
+
+#ifndef HINTSDB_STRUCTS_H
+#define HINTSDB_STRUCTS_H
+
+
+/* Structure for carrying around an open DBM file, and an open locking file
+that relates to it. */
+
+typedef struct {
+ void * dbptr;
+ int lockfd;
+} open_db;
+
+
+/* Structures for records stored in exim database dbm files. They all
+start with the same fields, described in the generic type. */
+
+
+typedef struct {
+ time_t time_stamp; /* Timestamp of writing */
+} dbdata_generic;
+
+
+/* This structure keeps track of retry information for a host or a local
+address. */
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ time_t first_failed; /* Time of first failure */
+ time_t last_try; /* Time of last try */
+ time_t next_try; /* Time of next try */
+ BOOL expired; /* Retry time has expired */
+ int basic_errno; /* Errno of last failure */
+ int more_errno; /* Additional information */
+ uschar text[1]; /* Text message for last failure */
+} dbdata_retry;
+
+/* These structures keep track of addresses that have had callout verification
+performed on them. There are two groups of records:
+
+1. keyed by localpart@domain -
+ Full address was tested and record holds result
+
+2. keyed by domain -
+ Domain response upto MAIL FROM:<>, postmaster, random local part;
+
+If a record exists, the result field is either ccache_accept or ccache_reject,
+or, for a domain record only, ccache_reject_mfnull when MAIL FROM:<> was
+rejected. The other fields, however, (which are only relevant to domain
+records) may also contain ccache_unknown if that particular test has not been
+done.
+
+Originally, there was only one structure, used for both types. However, it got
+expanded for domain records, so it got split. To make it possible for Exim to
+handle the old type of record, we retain the old definition. The different
+kinds of record can be distinguished by their different lengths. */
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ int result;
+ int postmaster_result; /* Postmaster is accepted */
+ int random_result; /* Random local part was accepted */
+} dbdata_callout_cache_obs;
+
+typedef struct {
+ time_t time_stamp; /* Timestamp of last address check */
+ /*************/
+ int result; /* accept or reject */
+} dbdata_callout_cache_address;
+
+/* For this new layout, we put the additional fields (the timestamps)
+last so that if somebody reverts to an older Exim, the new records will
+still make sense because they match the old layout. */
+
+typedef struct {
+ time_t time_stamp; /* Time stamp of last connection */
+ /*************/
+ int result; /* Domain reject or accept */
+ int postmaster_result; /* Postmaster result */
+ int random_result; /* Random result */
+ time_t postmaster_stamp; /* Timestamp of postmaster check */
+ time_t random_stamp; /* Timestamp of random check */
+} dbdata_callout_cache;
+
+/* This structure keeps track of messages that are waiting for a particular
+host for a particular transport. */
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ int count; /* Count of message ids */
+ int sequence; /* Sequence for continued records */
+ uschar text[1]; /* One long character string */
+} dbdata_wait;
+
+
+/* The contents of the "misc" database are a mixture of different kinds of
+record, as defined below. The keys used for a specific type all start with a
+given string such as "etrn-" or "host-serialize-". */
+
+
+/* This structure records a connection to a particular host, for the
+purpose of serializing access to certain hosts. For possible future extension,
+a field is defined for holding the count of connections, but it is not
+at present in use. The same structure is used for recording a running ETRN
+process. */
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ int count; /* Reserved for possible connection count */
+} dbdata_serialize;
+
+
+/* This structure records the information required for the ratelimit
+ACL condition. */
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ int time_usec; /* Fractional part of time, from gettimeofday() */
+ double rate; /* Smoothed sending rate at that time */
+} dbdata_ratelimit;
+
+/* Same as above, plus a Bloom filter for uniquifying events. */
+
+typedef struct {
+ dbdata_ratelimit dbd;
+ time_t bloom_epoch; /* When the Bloom filter was last reset */
+ unsigned bloom_size; /* Number of bytes in the Bloom filter */
+ uschar bloom[40]; /* Bloom filter which may be larger than this */
+} dbdata_ratelimit_unique;
+
+
+/* For "seen" ACL condition */
+typedef struct {
+ time_t time_stamp;
+} dbdata_seen;
+
+#ifndef DISABLE_PIPE_CONNECT
+/* This structure records the EHLO responses, cleartext and crypted,
+for an IP, as bitmasks (cf. OPTION_TLS). For LIMITS, also values
+advertised for MAILMAX, RCPTMAX and RCPTDOMAINMAX; zero meaning no
+value advertised. */
+
+typedef struct {
+ unsigned short cleartext_features;
+ unsigned short crypted_features;
+ unsigned short cleartext_auths;
+ unsigned short crypted_auths;
+
+# ifdef EXPERIMENTAL_ESMTP_LIMITS
+ unsigned int limit_mail;
+ unsigned int limit_rcpt;
+ unsigned int limit_rcptdom;
+# endif
+} ehlo_resp_precis;
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ ehlo_resp_precis data;
+} dbdata_ehlo_resp;
+#endif
+
+typedef struct {
+ time_t time_stamp;
+ /*************/
+ uschar verify_override:1;
+ uschar ocsp:3;
+ uschar session[1];
+} dbdata_tls_session;
+
+
+#endif /* whole file */
+/* End of hintsdb_structs.h */
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