2 * Copyright (C) 2004-2007, 2009, 2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001 Internet Software Consortium.
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29 * Simple database API.
38 #include <dns/types.h>
45 * A simple database. This is an opaque type.
47 typedef struct dns_sdb dns_sdb_t;
50 * A simple database lookup in progress. This is an opaque type.
52 typedef struct dns_sdblookup dns_sdblookup_t;
55 * A simple database traversal in progress. This is an opaque type.
57 typedef struct dns_sdballnodes dns_sdballnodes_t;
60 (*dns_sdblookupfunc_t)(const char *zone, const char *name, void *dbdata,
63 (*dns_sdblookup2func_t)(const dns_name_t *zone, const dns_name_t *name,
64 void *dbdata, dns_sdblookup_t *lookup);
67 (*dns_sdbauthorityfunc_t)(const char *zone, void *dbdata, dns_sdblookup_t *);
70 (*dns_sdballnodesfunc_t)(const char *zone, void *dbdata,
71 dns_sdballnodes_t *allnodes);
74 (*dns_sdbcreatefunc_t)(const char *zone, int argc, char **argv,
75 void *driverdata, void **dbdata);
78 (*dns_sdbdestroyfunc_t)(const char *zone, void *driverdata, void **dbdata);
81 typedef struct dns_sdbmethods {
82 dns_sdblookupfunc_t lookup;
83 dns_sdbauthorityfunc_t authority;
84 dns_sdballnodesfunc_t allnodes;
85 dns_sdbcreatefunc_t create;
86 dns_sdbdestroyfunc_t destroy;
87 dns_sdblookup2func_t lookup2;
96 #define DNS_SDBFLAG_RELATIVEOWNER 0x00000001U
97 #define DNS_SDBFLAG_RELATIVERDATA 0x00000002U
98 #define DNS_SDBFLAG_THREADSAFE 0x00000004U
99 #define DNS_SDBFLAG_DNS64 0x00000008U
102 dns_sdb_register(const char *drivername, const dns_sdbmethods_t *methods,
103 void *driverdata, unsigned int flags, isc_mem_t *mctx,
104 dns_sdbimplementation_t **sdbimp);
106 * Register a simple database driver for the database type 'drivername',
107 * implemented by the functions in '*methods'.
109 * sdbimp must point to a NULL dns_sdbimplementation_t pointer. That is,
110 * sdbimp != NULL && *sdbimp == NULL. It will be assigned a value that
111 * will later be used to identify the driver when deregistering it.
113 * The name server will perform lookups in the database by calling the
114 * function 'lookup', passing it a printable zone name 'zone', a printable
115 * domain name 'name', and a copy of the argument 'dbdata' that
116 * was potentially returned by the create function. The 'dns_sdblookup_t'
117 * argument to 'lookup' and 'authority' is an opaque pointer to be passed to
120 * The lookup function returns the lookup results to the name server
121 * by calling ns_sdb_putrr() once for each record found. On success,
122 * the return value of the lookup function should be ISC_R_SUCCESS.
123 * If the domain name 'name' does not exist, the lookup function should
124 * ISC_R_NOTFOUND. Any other return value is treated as an error.
126 * Lookups at the zone apex will cause the server to also call the
127 * function 'authority' (if non-NULL), which must provide an SOA record
128 * and NS records for the zone by calling ns_sdb_putrr() once for each of
129 * these records. The 'authority' function may be NULL if invoking
130 * the 'lookup' function on the zone apex will return SOA and NS records.
132 * The allnodes function, if non-NULL, fills in an opaque structure to be
133 * used by a database iterator. This allows the zone to be transferred.
134 * This may use a considerable amount of memory for large zones, and the
135 * zone transfer may not be fully RFC1035 compliant if the zone is
136 * frequently changed.
138 * The create function will be called for each zone configured
139 * into the name server using this database type. It can be used
140 * to create a "database object" containing zone specific data,
141 * which can make use of the database arguments specified in the
142 * name server configuration.
144 * The destroy function will be called to free the database object
145 * when its zone is destroyed.
147 * The create and destroy functions may be NULL.
149 * If flags includes DNS_SDBFLAG_RELATIVEOWNER, the lookup and authority
150 * functions will be called with relative names rather than absolute names.
151 * The string "@" represents the zone apex in this case.
153 * If flags includes DNS_SDBFLAG_RELATIVERDATA, the rdata strings may
154 * include relative names. Otherwise, all names in the rdata string must
155 * be absolute. Be aware that if relative names are allowed, any
156 * absolute names must contain a trailing dot.
158 * If flags includes DNS_SDBFLAG_THREADSAFE, the driver must be able to
159 * handle multiple lookups in parallel. Otherwise, calls into the driver
164 dns_sdb_unregister(dns_sdbimplementation_t **sdbimp);
166 * Removes the simple database driver from the list of registered database
167 * types. There must be no active databases of this type when this function
171 /*% See dns_sdb_putradata() */
173 dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl,
176 dns_sdb_putrdata(dns_sdblookup_t *lookup, dns_rdatatype_t type, dns_ttl_t ttl,
177 const unsigned char *rdata, unsigned int rdlen);
179 * Add a single resource record to the lookup structure to be
180 * returned in the query response. dns_sdb_putrr() takes the
181 * resource record in master file text format as a null-terminated
182 * string, and dns_sdb_putrdata() takes the raw RDATA in
183 * uncompressed wire format.
186 /*% See dns_sdb_putnamerdata() */
188 dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name,
189 const char *type, dns_ttl_t ttl, const char *data);
191 dns_sdb_putnamedrdata(dns_sdballnodes_t *allnodes, const char *name,
192 dns_rdatatype_t type, dns_ttl_t ttl,
193 const void *rdata, unsigned int rdlen);
195 * Add a single resource record to the allnodes structure to be
196 * included in a zone transfer response, in text or wire
201 dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname,
202 isc_uint32_t serial);
204 * This function may optionally be called from the 'authority' callback
205 * to simplify construction of the SOA record for 'zone'. It will
206 * provide a SOA listing 'mname' as as the master server and 'rname' as
207 * the responsible person mailbox. It is the responsibility of the
208 * driver to increment the serial number between responses if necessary.
209 * All other SOA fields will have reasonable default values.
214 #endif /* DNS_SDB_H */