2 * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2001, 2003 Internet Software Consortium.
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.
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.
18 /* $Id: nxt.c,v 1.26.2.3 2004/03/09 06:11:04 marka Exp $ */
22 #include <isc/string.h>
27 #include <dns/rdata.h>
28 #include <dns/rdatalist.h>
29 #include <dns/rdataset.h>
30 #include <dns/rdatasetiter.h>
31 #include <dns/rdatastruct.h>
32 #include <dns/result.h>
34 #define RETERR(x) do { \
36 if (result != ISC_R_SUCCESS) \
41 set_bit(unsigned char *array, unsigned int index, unsigned int bit) {
42 unsigned int shift, mask;
44 shift = 7 - (index % 8);
48 array[index / 8] |= mask;
50 array[index / 8] &= (~mask & 0xFF);
54 bit_isset(unsigned char *array, unsigned int index) {
55 unsigned int byte, shift, mask;
57 byte = array[index / 8];
58 shift = 7 - (index % 8);
61 return ((byte & mask) != 0);
65 dns_nxt_buildrdata(dns_db_t *db, dns_dbversion_t *version,
66 dns_dbnode_t *node, dns_name_t *target,
67 unsigned char *buffer, dns_rdata_t *rdata)
70 dns_rdataset_t rdataset;
74 unsigned char *nxt_bits;
75 unsigned int max_type;
76 dns_rdatasetiter_t *rdsiter;
78 memset(buffer, 0, DNS_NXT_BUFFERSIZE);
79 dns_name_toregion(target, &r);
80 memcpy(buffer, r.base, r.length);
82 nxt_bits = r.base + r.length;
83 set_bit(nxt_bits, dns_rdatatype_nxt, 1);
84 max_type = dns_rdatatype_nxt;
85 dns_rdataset_init(&rdataset);
87 result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
88 if (result != ISC_R_SUCCESS)
90 for (result = dns_rdatasetiter_first(rdsiter);
91 result == ISC_R_SUCCESS;
92 result = dns_rdatasetiter_next(rdsiter))
94 dns_rdatasetiter_current(rdsiter, &rdataset);
95 if (rdataset.type > 127)
96 /* XXX "rdataset type too large" */
98 if (rdataset.type != dns_rdatatype_nxt) {
99 if (rdataset.type > max_type)
100 max_type = rdataset.type;
101 set_bit(nxt_bits, rdataset.type, 1);
103 dns_rdataset_disassociate(&rdataset);
107 * At zone cuts, deny the existence of glue in the parent zone.
109 if (bit_isset(nxt_bits, dns_rdatatype_ns) &&
110 ! bit_isset(nxt_bits, dns_rdatatype_soa)) {
111 for (i = 0; i < 128; i++) {
112 if (bit_isset(nxt_bits, i) &&
113 ! dns_rdatatype_iszonecutauth((dns_rdatatype_t)i))
114 set_bit(nxt_bits, i, 0);
118 dns_rdatasetiter_destroy(&rdsiter);
119 if (result != ISC_R_NOMORE)
122 r.length += max_type / 8 + 1;
123 INSIST(r.length <= DNS_NXT_BUFFERSIZE);
124 dns_rdata_fromregion(rdata,
129 return (ISC_R_SUCCESS);
134 dns_nxt_build(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
135 dns_name_t *target, dns_ttl_t ttl)
138 dns_rdata_t rdata = DNS_RDATA_INIT;
139 unsigned char data[DNS_NXT_BUFFERSIZE];
140 dns_rdatalist_t rdatalist;
141 dns_rdataset_t rdataset;
143 dns_rdataset_init(&rdataset);
144 dns_rdata_init(&rdata);
146 RETERR(dns_nxt_buildrdata(db, version, node, target, data, &rdata));
148 rdatalist.rdclass = dns_db_class(db);
149 rdatalist.type = dns_rdatatype_nxt;
150 rdatalist.covers = 0;
152 ISC_LIST_INIT(rdatalist.rdata);
153 ISC_LIST_APPEND(rdatalist.rdata, &rdata, link);
154 RETERR(dns_rdatalist_tordataset(&rdatalist, &rdataset));
155 result = dns_db_addrdataset(db, node, version, 0, &rdataset,
157 if (result == DNS_R_UNCHANGED)
158 result = ISC_R_SUCCESS;
161 if (dns_rdataset_isassociated(&rdataset))
162 dns_rdataset_disassociate(&rdataset);
167 dns_nxt_typepresent(dns_rdata_t *nxt, dns_rdatatype_t type) {
168 dns_rdata_nxt_t nxtstruct;
170 isc_boolean_t present;
172 REQUIRE(nxt != NULL);
173 REQUIRE(nxt->type == dns_rdatatype_nxt);
176 /* This should never fail */
177 result = dns_rdata_tostruct(nxt, &nxtstruct, NULL);
178 INSIST(result == ISC_R_SUCCESS);
180 if (type >= nxtstruct.len * 8)
183 present = ISC_TF(bit_isset(nxtstruct.typebits, type));
184 dns_rdata_freestruct(&nxt);