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
|
/*
* iterator/iter_hints.h - iterative resolver module stub and root hints.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions to assist the iterator module.
* Keep track of stub and root hints, and read those from config.
*/
#ifndef ITERATOR_ITER_HINTS_H
#define ITERATOR_ITER_HINTS_H
#include "util/storage/dnstree.h"
struct iter_env;
struct config_file;
struct delegpt;
struct regional;
/**
* Iterator hints structure
*/
struct iter_hints {
/** regional where hints are allocated */
struct regional* region;
/**
* Hints are stored in this tree. Sort order is specially chosen.
* first sorted on qclass. Then on dname in nsec-like order, so that
* a lookup on class, name will return an exact match or the closest
* match which gives the ancestor needed.
* contents of type iter_hints_stub. The class IN root is in here.
* uses name_tree_node from dnstree.h.
*/
rbtree_t tree;
};
/**
* Iterator hints for a particular stub.
*/
struct iter_hints_stub {
/** tree sorted by name, class */
struct name_tree_node node;
/** delegation point with hint information for this stub. */
struct delegpt* dp;
/** does the stub need to forego priming (like on other ports) */
uint8_t noprime;
};
/**
* Create hints
* @return new hints or NULL on error.
*/
struct iter_hints* hints_create(void);
/**
* Delete hints.
* @param hints: to delete.
*/
void hints_delete(struct iter_hints* hints);
/**
* Process hints config. Sets default values for root hints if no config.
* @param hints: where to store.
* @param cfg: config options.
* @return 0 on error.
*/
int hints_apply_cfg(struct iter_hints* hints, struct config_file* cfg);
/**
* Find root hints for the given class.
* @param hints: hint storage.
* @param qclass: class for which root hints are requested. host order.
* @return: NULL if no hints, or a ptr to stored hints.
*/
struct delegpt* hints_lookup_root(struct iter_hints* hints, uint16_t qclass);
/**
* Find next root hints (to cycle through all root hints).
* @param hints: hint storage
* @param qclass: class for which root hints are sought.
* 0 means give the first available root hints class.
* x means, give class x or a higher class if any.
* returns the found class in this variable.
* @return true if a root hint class is found.
* false if not root hint class is found (qclass may have been changed).
*/
int hints_next_root(struct iter_hints* hints, uint16_t* qclass);
/**
* Given a qname/qclass combination, and the delegation point from the cache
* for this qname/qclass, determine if this combination indicates that a
* stub hint exists and must be primed.
*
* @param hints: hint storage.
* @param qname: The qname that generated the delegation point.
* @param qclass: The qclass that generated the delegation point.
* @param dp: The cache generated delegation point.
* @return: A priming delegation point if there is a stub hint that must
* be primed, otherwise null.
*/
struct iter_hints_stub* hints_lookup_stub(struct iter_hints* hints,
uint8_t* qname, uint16_t qclass, struct delegpt* dp);
/**
* Get memory in use by hints
* @param hints: hint storage.
* @return bytes in use
*/
size_t hints_get_mem(struct iter_hints* hints);
#endif /* ITERATOR_ITER_HINTS_H */
|
Swift