1 /*
2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /* $Id: rdatalist.c,v 1.6 2022/06/26 09:43:39 florian Exp $ */
18
19 /*! \file */
20
21 #include <stddef.h>
22
23 #include <isc/util.h>
24
25 #include <dns/rdata.h>
26 #include <dns/rdatalist.h>
27 #include <dns/rdataset.h>
28
29 #include "rdatalist_p.h"
30
31 static dns_rdatasetmethods_t methods = {
32 isc__rdatalist_disassociate,
33 isc__rdatalist_first,
34 isc__rdatalist_next,
35 isc__rdatalist_current,
36 isc__rdatalist_clone,
37 isc__rdatalist_count,
38 };
39
40 void
dns_rdatalist_init(dns_rdatalist_t * rdatalist)41 dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
42
43 REQUIRE(rdatalist != NULL);
44
45 /*
46 * Initialize rdatalist.
47 */
48
49 rdatalist->rdclass = 0;
50 rdatalist->type = 0;
51 rdatalist->covers = 0;
52 rdatalist->ttl = 0;
53 ISC_LIST_INIT(rdatalist->rdata);
54 ISC_LINK_INIT(rdatalist, link);
55 }
56
57 isc_result_t
dns_rdatalist_tordataset(dns_rdatalist_t * rdatalist,dns_rdataset_t * rdataset)58 dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist,
59 dns_rdataset_t *rdataset)
60 {
61 /*
62 * Make 'rdataset' refer to the rdata in 'rdatalist'.
63 */
64
65 REQUIRE(rdatalist != NULL);
66 REQUIRE(! dns_rdataset_isassociated(rdataset));
67
68 rdataset->methods = &methods;
69 rdataset->rdclass = rdatalist->rdclass;
70 rdataset->type = rdatalist->type;
71 rdataset->covers = rdatalist->covers;
72 rdataset->ttl = rdatalist->ttl;
73 rdataset->private1 = rdatalist;
74 rdataset->private2 = NULL;
75
76 return (ISC_R_SUCCESS);
77 }
78
79 isc_result_t
dns_rdatalist_fromrdataset(dns_rdataset_t * rdataset,dns_rdatalist_t ** rdatalist)80 dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
81 dns_rdatalist_t **rdatalist)
82 {
83 REQUIRE(rdatalist != NULL && rdataset != NULL);
84 *rdatalist = rdataset->private1;
85
86 return (ISC_R_SUCCESS);
87 }
88
89 void
isc__rdatalist_disassociate(dns_rdataset_t * rdataset)90 isc__rdatalist_disassociate(dns_rdataset_t *rdataset) {
91 UNUSED(rdataset);
92 }
93
94 isc_result_t
isc__rdatalist_first(dns_rdataset_t * rdataset)95 isc__rdatalist_first(dns_rdataset_t *rdataset) {
96 dns_rdatalist_t *rdatalist;
97
98 rdatalist = rdataset->private1;
99 rdataset->private2 = ISC_LIST_HEAD(rdatalist->rdata);
100
101 if (rdataset->private2 == NULL)
102 return (ISC_R_NOMORE);
103
104 return (ISC_R_SUCCESS);
105 }
106
107 isc_result_t
isc__rdatalist_next(dns_rdataset_t * rdataset)108 isc__rdatalist_next(dns_rdataset_t *rdataset) {
109 dns_rdata_t *rdata;
110
111 REQUIRE(rdataset != NULL);
112
113 rdata = rdataset->private2;
114 if (rdata == NULL)
115 return (ISC_R_NOMORE);
116
117 rdataset->private2 = ISC_LIST_NEXT(rdata, link);
118
119 if (rdataset->private2 == NULL)
120 return (ISC_R_NOMORE);
121
122 return (ISC_R_SUCCESS);
123 }
124
125 void
isc__rdatalist_current(dns_rdataset_t * rdataset,dns_rdata_t * rdata)126 isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
127 dns_rdata_t *list_rdata;
128
129 REQUIRE(rdataset != NULL);
130
131 list_rdata = rdataset->private2;
132 INSIST(list_rdata != NULL);
133
134 dns_rdata_clone(list_rdata, rdata);
135 }
136
137 void
isc__rdatalist_clone(dns_rdataset_t * source,dns_rdataset_t * target)138 isc__rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
139
140 REQUIRE(source != NULL);
141 REQUIRE(target != NULL);
142
143 *target = *source;
144
145 /*
146 * Reset iterator state.
147 */
148 target->private2 = NULL;
149 }
150
151 unsigned int
isc__rdatalist_count(dns_rdataset_t * rdataset)152 isc__rdatalist_count(dns_rdataset_t *rdataset) {
153 dns_rdatalist_t *rdatalist;
154 dns_rdata_t *rdata;
155 unsigned int count;
156
157 REQUIRE(rdataset != NULL);
158
159 rdatalist = rdataset->private1;
160
161 count = 0;
162 for (rdata = ISC_LIST_HEAD(rdatalist->rdata);
163 rdata != NULL;
164 rdata = ISC_LIST_NEXT(rdata, link))
165 count++;
166
167 return (count);
168 }
169