contrib/bind/lib/dns/order.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2002  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: order.c,v 1.10 2007/06/19 23:47:16 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <isc/magic.h>
  25 #include <isc/mem.h>
  26 #include <isc/types.h>
  27 #include <isc/util.h>
  28 #include <isc/refcount.h>
  29
  30 #include <dns/fixedname.h>
  31 #include <dns/name.h>
  32 #include <dns/order.h>
  33 #include <dns/rdataset.h>
  34 #include <dns/types.h>
  35
  36 typedef struct dns_order_ent dns_order_ent_t;
  37 struct dns_order_ent {
  38         dns_fixedname_t                 name;
  39         dns_rdataclass_t                rdclass;
  40         dns_rdatatype_t                 rdtype;
  41         unsigned int                    mode;
  42         ISC_LINK(dns_order_ent_t)       link;
  43 };
  44
  45 struct dns_order {
  46         unsigned int                    magic;
  47         isc_refcount_t                  references;
  48         ISC_LIST(dns_order_ent_t)       ents;
  49         isc_mem_t                       *mctx;
  50 };
  51
  52 #define DNS_ORDER_MAGIC ISC_MAGIC('O','r','d','r')
  53 #define DNS_ORDER_VALID(order)  ISC_MAGIC_VALID(order, DNS_ORDER_MAGIC)
  54
  55 isc_result_t
  56 dns_order_create(isc_mem_t *mctx, dns_order_t **orderp) {
  57         dns_order_t *order;
  58         isc_result_t result;
  59
  60         REQUIRE(orderp != NULL && *orderp == NULL);
  61
  62         order = isc_mem_get(mctx, sizeof(*order));
  63         if (order == NULL)
  64                 return (ISC_R_NOMEMORY);
  65
  66         ISC_LIST_INIT(order->ents);
  67
  68         /* Implicit attach. */
  69         result = isc_refcount_init(&order->references, 1);
  70         if (result != ISC_R_SUCCESS) {
  71                 isc_mem_put(mctx, order, sizeof(*order));
  72                 return (result);
  73         }
  74
  75         order->mctx = NULL;
  76         isc_mem_attach(mctx, &order->mctx);
  77         order->magic = DNS_ORDER_MAGIC;
  78         *orderp = order;
  79         return (ISC_R_SUCCESS);
  80 }
  81
  82 isc_result_t
  83 dns_order_add(dns_order_t *order, dns_name_t *name,
  84               dns_rdatatype_t rdtype, dns_rdataclass_t rdclass,
  85               unsigned int mode)
  86 {
  87         dns_order_ent_t *ent;
  88
  89         REQUIRE(DNS_ORDER_VALID(order));
  90         REQUIRE(mode == DNS_RDATASETATTR_RANDOMIZE ||
  91                 mode == DNS_RDATASETATTR_FIXEDORDER ||
  92                 mode == 0 /* DNS_RDATASETATTR_CYCLIC */ );
  93
  94         ent = isc_mem_get(order->mctx, sizeof(*ent));
  95         if (ent == NULL)
  96                 return (ISC_R_NOMEMORY);
  97
  98         dns_fixedname_init(&ent->name);
  99         RUNTIME_CHECK(dns_name_copy(name, dns_fixedname_name(&ent->name), NULL)
 100                       == ISC_R_SUCCESS);
 101         ent->rdtype = rdtype;
 102         ent->rdclass = rdclass;
 103         ent->mode = mode;
 104         ISC_LINK_INIT(ent, link);
 105         ISC_LIST_INITANDAPPEND(order->ents, ent, link);
 106         return (ISC_R_SUCCESS);
 107 }
 108
 109 static inline isc_boolean_t
 110 match(dns_name_t *name1, dns_name_t *name2) {
 111
 112         if (dns_name_iswildcard(name2))
 113                 return(dns_name_matcheswildcard(name1, name2));
 114         return (dns_name_equal(name1, name2));
 115 }
 116
 117 unsigned int
 118 dns_order_find(dns_order_t *order, dns_name_t *name,
 119                dns_rdatatype_t rdtype, dns_rdataclass_t rdclass)
 120 {
 121         dns_order_ent_t *ent;
 122         REQUIRE(DNS_ORDER_VALID(order));
 123
 124         for (ent = ISC_LIST_HEAD(order->ents);
 125              ent != NULL;
 126              ent = ISC_LIST_NEXT(ent, link)) {
 127                 if (ent->rdtype != rdtype && ent->rdtype != dns_rdatatype_any)
 128                         continue;
 129                 if (ent->rdclass != rdclass &&
 130                     ent->rdclass != dns_rdataclass_any)
 131                         continue;
 132                 if (match(name, dns_fixedname_name(&ent->name)))
 133                         return (ent->mode);
 134         }
 135         return (0);
 136 }
 137
 138 void
 139 dns_order_attach(dns_order_t *source, dns_order_t **target) {
 140         REQUIRE(DNS_ORDER_VALID(source));
 141         REQUIRE(target != NULL && *target == NULL);
 142         isc_refcount_increment(&source->references, NULL);
 143         *target = source;
 144 }
 145
 146 void
 147 dns_order_detach(dns_order_t **orderp) {
 148         dns_order_t *order;
 149         dns_order_ent_t *ent;
 150         unsigned int references;
 151
 152         REQUIRE(orderp != NULL);
 153         order = *orderp;
 154         REQUIRE(DNS_ORDER_VALID(order));
 155         isc_refcount_decrement(&order->references, &references);
 156         *orderp = NULL;
 157         if (references != 0)
 158                 return;
 159
 160         order->magic = 0;
 161         while ((ent = ISC_LIST_HEAD(order->ents)) != NULL) {
 162                 ISC_LIST_UNLINK(order->ents, ent, link);
 163                 isc_mem_put(order->mctx, ent, sizeof(*ent));
 164         }
 165         isc_refcount_destroy(&order->references);
 166         isc_mem_putanddetach(&order->mctx, order, sizeof(*order));
 167 }