contrib/bind-9.2.4rc7/lib/dns/include/dns/sdb.h

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: sdb.h,v 1.12.2.1 2004/03/09 06:11:22 marka Exp $ */
  19
  20 #ifndef DNS_SDB_H
  21 #define DNS_SDB_H 1
  22
  23 /*****
  24  ***** Module Info
  25  *****/
  26
  27 /*
  28  * Simple database API.
  29  */
  30
  31 /***
  32  *** Imports
  33  ***/
  34
  35 #include <isc/lang.h>
  36
  37 #include <dns/types.h>
  38
  39 /***
  40  *** Types
  41  ***/
  42
  43 /*
  44  * A simple database.  This is an opaque type.
  45  */
  46 typedef struct dns_sdb dns_sdb_t;
  47
  48 /*
  49  * A simple database lookup in progress.  This is an opaque type.
  50  */
  51 typedef struct dns_sdblookup dns_sdblookup_t;
  52
  53 /*
  54  * A simple database traversal in progress.  This is an opaque type.
  55  */
  56 typedef struct dns_sdballnodes dns_sdballnodes_t;
  57
  58 typedef isc_result_t
  59 (*dns_sdblookupfunc_t)(const char *zone, const char *name, void *dbdata,
  60                        dns_sdblookup_t *);
  61
  62 typedef isc_result_t
  63 (*dns_sdbauthorityfunc_t)(const char *zone, void *dbdata, dns_sdblookup_t *);
  64
  65 typedef isc_result_t
  66 (*dns_sdballnodesfunc_t)(const char *zone, void *dbdata,
  67                          dns_sdballnodes_t *allnodes);
  68
  69 typedef isc_result_t
  70 (*dns_sdbcreatefunc_t)(const char *zone, int argc, char **argv,
  71                        void *driverdata, void **dbdata);
  72
  73 typedef void
  74 (*dns_sdbdestroyfunc_t)(const char *zone, void *driverdata, void **dbdata);
  75
  76
  77 typedef struct dns_sdbmethods {
  78         dns_sdblookupfunc_t     lookup;
  79         dns_sdbauthorityfunc_t  authority;
  80         dns_sdballnodesfunc_t   allnodes;
  81         dns_sdbcreatefunc_t     create;
  82         dns_sdbdestroyfunc_t    destroy;
  83 } dns_sdbmethods_t;
  84
  85 /***
  86  *** Functions
  87  ***/
  88
  89 ISC_LANG_BEGINDECLS
  90
  91 #define DNS_SDBFLAG_RELATIVEOWNER 0x00000001U
  92 #define DNS_SDBFLAG_RELATIVERDATA 0x00000002U
  93 #define DNS_SDBFLAG_THREADSAFE 0x00000004U
  94
  95 isc_result_t
  96 dns_sdb_register(const char *drivername, const dns_sdbmethods_t *methods,
  97                  void *driverdata, unsigned int flags, isc_mem_t *mctx,
  98                  dns_sdbimplementation_t **sdbimp);
  99 /*
 100  * Register a simple database driver for the database type 'drivername',
 101  * implemented by the functions in '*methods'.
 102  *
 103  * sdbimp must point to a NULL dns_sdbimplementation_t pointer.  That is,
 104  * sdbimp != NULL && *sdbimp == NULL.  It will be assigned a value that
 105  * will later be used to identify the driver when deregistering it.
 106  *
 107  * The name server will perform lookups in the database by calling the
 108  * function 'lookup', passing it a printable zone name 'zone', a printable
 109  * domain name 'name', and a copy of the argument 'dbdata' that
 110  * was potentially returned by the create function.  The 'dns_sdblookup_t'
 111  * argument to 'lookup' and 'authority' is an opaque pointer to be passed to
 112  * ns_sdb_putrr().
 113  *
 114  * The lookup function returns the lookup results to the name server
 115  * by calling ns_sdb_putrr() once for each record found.
 116  *
 117  * Lookups at the zone apex will cause the server to also call the
 118  * function 'authority' (if non-NULL), which must provide an SOA record
 119  * and NS records for the zone by calling ns_sdb_putrr() once for each of
 120  * these records.  The 'authority' function may be NULL if invoking
 121  * the 'lookup' function on the zone apex will return SOA and NS records.
 122  *
 123  * The allnodes function, if non-NULL, fills in an opaque structure to be
 124  * used by a database iterator.  This allows the zone to be transferred.
 125  * This may use a considerable amount of memory for large zones, and the
 126  * zone transfer may not be fully RFC 1035 compliant if the zone is
 127  * frequently changed.
 128  *
 129  * The create function will be called for each zone configured
 130  * into the name server using this database type.  It can be used
 131  * to create a "database object" containg zone specific data,
 132  * which can make use of the database arguments specified in the
 133  * name server configuration.
 134  *
 135  * The destroy function will be called to free the database object
 136  * when its zone is destroyed.
 137  *
 138  * The create and destroy functions may be NULL.
 139  *
 140  * If flags includes DNS_SDBFLAG_RELATIVEOWNER, the lookup and authority
 141  * functions will be called with relative names rather than absolute names.
 142  * The string "@" represents the zone apex in this case.
 143  *
 144  * If flags includes DNS_SDBFLAG_RELATIVERDATA, the rdata strings may
 145  * include relative names.  Otherwise, all names in the rdata string must
 146  * be absolute.  Be aware that if relative names are allowed, any
 147  * absolute names must contain a trailing dot.
 148  *
 149  * If flags includes DNS_SDBFLAG_THREADSAFE, the driver must be able to
 150  * handle multiple lookups in parallel.  Otherwise, calls into the driver
 151  * are serialized.
 152  */
 153
 154 void
 155 dns_sdb_unregister(dns_sdbimplementation_t **sdbimp);
 156 /*
 157  * Removes the simple database driver from the list of registered database
 158  * types.  There must be no active databases of this type when this function
 159  * is called.
 160  */
 161
 162 isc_result_t
 163 dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl,
 164               const char *data);
 165 /*
 166  * Add a single resource record to the lookup structure to be later
 167  * parsed into a query response.
 168  */
 169
 170 isc_result_t
 171 dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name,
 172                    const char *type, dns_ttl_t ttl, const char *data);
 173 /*
 174  * Add a single resource record to the allnodes structure to be later
 175  * parsed into a zone transfer response.
 176  */
 177
 178 isc_result_t
 179 dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname,
 180                isc_uint32_t serial);
 181 /*
 182  * This function may optionally be called from the 'authority' callback
 183  * to simplify construction of the SOA record for 'zone'.  It will
 184  * provide a SOA listing 'mname' as as the master server and 'rname' as
 185  * the responsible person mailbox.  It is the responsibility of the
 186  * driver to increment the serial number between responses if necessary.
 187  * All other SOA fields will have reasonable default values.
 188  */
 189
 190 ISC_LANG_ENDDECLS
 191
 192 #endif /* DNS_SDB_H */