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
31static 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
40void
41dns_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
57isc_result_t
58dns_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
79isc_result_t
80dns_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
89void
90isc__rdatalist_disassociate(dns_rdataset_t *rdataset) {
91	UNUSED(rdataset);
92}
93
94isc_result_t
95isc__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
107isc_result_t
108isc__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
125void
126isc__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
137void
138isc__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
151unsigned int
152isc__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