contrib/bind-9.5.2/lib/dns/include/dns/forward.h

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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: forward.h,v 1.11 2007/06/19 23:47:16 tbox Exp $ */
  19
  20 #ifndef DNS_FORWARD_H
  21 #define DNS_FORWARD_H 1
  22
  23 /*! \file dns/forward.h */
  24
  25 #include <isc/lang.h>
  26 #include <isc/result.h>
  27
  28 #include <dns/types.h>
  29
  30 ISC_LANG_BEGINDECLS
  31
  32 struct dns_forwarders {
  33         isc_sockaddrlist_t      addrs;
  34         dns_fwdpolicy_t         fwdpolicy;
  35 };
  36
  37 isc_result_t
  38 dns_fwdtable_create(isc_mem_t *mctx, dns_fwdtable_t **fwdtablep);
  39 /*%<
  40  * Creates a new forwarding table.
  41  *
  42  * Requires:
  43  * \li  mctx is a valid memory context.
  44  * \li  fwdtablep != NULL && *fwdtablep == NULL
  45  *
  46  * Returns:
  47  * \li  #ISC_R_SUCCESS
  48  * \li  #ISC_R_NOMEMORY
  49  */
  50
  51 isc_result_t
  52 dns_fwdtable_add(dns_fwdtable_t *fwdtable, dns_name_t *name,
  53                  isc_sockaddrlist_t *addrs, dns_fwdpolicy_t policy);
  54 /*%<
  55  * Adds an entry to the forwarding table.  The entry associates
  56  * a domain with a list of forwarders and a forwarding policy.  The
  57  * addrs list is copied if not empty, so the caller should free its copy.
  58  *
  59  * Requires:
  60  * \li  fwdtable is a valid forwarding table.
  61  * \li  name is a valid name
  62  * \li  addrs is a valid list of sockaddrs, which may be empty.
  63  *
  64  * Returns:
  65  * \li  #ISC_R_SUCCESS
  66  * \li  #ISC_R_NOMEMORY
  67  */
  68
  69 isc_result_t
  70 dns_fwdtable_find(dns_fwdtable_t *fwdtable, dns_name_t *name,
  71                   dns_forwarders_t **forwardersp);
  72 /*%<
  73  * Finds a domain in the forwarding table.  The closest matching parent
  74  * domain is returned.
  75  *
  76  * Requires:
  77  * \li  fwdtable is a valid forwarding table.
  78  * \li  name is a valid name
  79  * \li  forwardersp != NULL && *forwardersp == NULL
  80  *
  81  * Returns:
  82  * \li  #ISC_R_SUCCESS
  83  * \li  #ISC_R_NOTFOUND
  84  */
  85
  86 isc_result_t
  87 dns_fwdtable_find2(dns_fwdtable_t *fwdtable, dns_name_t *name,
  88                    dns_name_t *foundname, dns_forwarders_t **forwardersp);
  89 /*%<
  90  * Finds a domain in the forwarding table.  The closest matching parent
  91  * domain is returned.
  92  *
  93  * Requires:
  94  * \li  fwdtable is a valid forwarding table.
  95  * \li  name is a valid name
  96  * \li  forwardersp != NULL && *forwardersp == NULL
  97  * \li  foundname to be NULL or a valid name with buffer.
  98  *
  99  * Returns:
 100  * \li  #ISC_R_SUCCESS
 101  * \li  #ISC_R_NOTFOUND
 102  */
 103
 104 void
 105 dns_fwdtable_destroy(dns_fwdtable_t **fwdtablep);
 106 /*%<
 107  * Destroys a forwarding table.
 108  *
 109  * Requires:
 110  * \li  fwtablep != NULL && *fwtablep != NULL
 111  *
 112  * Ensures:
 113  * \li  all memory associated with the forwarding table is freed.
 114  */
 115
 116 ISC_LANG_ENDDECLS
 117
 118 #endif /* DNS_FORWARD_H */