1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#pragma once
/*****
***** Module Info
*****/
/*! \file dns/rriterator.h
* \brief
* Functions for "walking" a zone database, visiting each RR or RRset in turn.
*/
/*****
***** Imports
*****/
#include <inttypes.h>
#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/stdtime.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
/*****
***** Types
*****/
/*%
* A dns_rriterator_t is an iterator that iterates over an entire database,
* returning one RR at a time, in some arbitrary order.
*/
typedef struct dns_rriterator {
unsigned int magic;
isc_result_t result;
dns_db_t *db;
dns_dbiterator_t *dbit;
dns_dbversion_t *ver;
isc_stdtime_t now;
dns_dbnode_t *node;
dns_fixedname_t fixedname;
dns_rdatasetiter_t *rdatasetit;
dns_rdataset_t rdataset;
dns_rdata_t rdata;
} dns_rriterator_t;
#define RRITERATOR_MAGIC ISC_MAGIC('R', 'R', 'I', 't')
#define VALID_RRITERATOR(m) ISC_MAGIC_VALID(m, RRITERATOR_MAGIC)
isc_result_t
dns_rriterator_init(dns_rriterator_t *it, dns_db_t *db, dns_dbversion_t *ver,
isc_stdtime_t now);
/*%
* Initialize an rriterator; sets the cursor to the origin node
* of the database.
*
* Requires:
*
* \li 'db' is a valid database.
*
* Returns:
*
* \li #ISC_R_SUCCESS
* \li #ISC_R_NOMEMORY
*/
isc_result_t
dns_rriterator_first(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the first rdata in the database.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE There are no rdata in the set.
*/
isc_result_t
dns_rriterator_nextrrset(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the next rrset in the database,
* skipping over any remaining records that have the same rdatatype
* as the current one.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE No more rrsets in the database
*/
isc_result_t
dns_rriterator_next(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the next rrset in the database,
* skipping over any remaining records that have the same rdatatype
* as the current one.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE No more records in the database
*/
void
dns_rriterator_current(dns_rriterator_t *it, dns_name_t **name, uint32_t *ttl,
dns_rdataset_t **rdataset, dns_rdata_t **rdata);
/*%<
* Make '*name' refer to the current name. If 'rdataset' is not NULL,
* make '*rdataset' refer to the current * rdataset. If '*rdata' is not
* NULL, make '*rdata' refer to the current record.
*
* Requires:
*\li '*name' is a valid name object
*\li 'rdataset' is NULL or '*rdataset' is NULL
*\li 'rdata' is NULL or '*rdata' is NULL
*
* Ensures:
*\li 'rdata' refers to the rdata at the rdata cursor location of
*\li 'rdataset'.
*/
void
dns_rriterator_pause(dns_rriterator_t *it);
/*%<
* Pause rriterator. Frees any locks held by the database iterator.
* Callers should use this routine any time they are not going to
* execute another rriterator method in the immediate future.
*
* Requires:
*\li 'it' is a valid iterator.
*
* Ensures:
*\li Any database locks being held for efficiency of iterator access are
* released.
*/
void
dns_rriterator_destroy(dns_rriterator_t *it);
/*%<
* Shut down and free resources in rriterator 'it'.
*
* Requires:
*
*\li 'it' is a valid iterator.
*
* Ensures:
*
*\li All resources used by the rriterator are freed.
*/
ISC_LANG_ENDDECLS
|
