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
|
/*
* Copyright (C) 2012 Reto Guadagnini
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup rsolver_response resolver_response
* @{ @ingroup resolver
*/
#ifndef RESOLVER_RESPONSE_H_
#define RESOLVER_RESPONSE_H_
typedef struct resolver_response_t resolver_response_t;
typedef enum dnssec_status_t dnssec_status_t;
#include <library.h>
#include <resolver/rr_set.h>
/**
* DNSSEC security state.
*
* DNSSEC security state, which a security aware resolver is able determine
* according to RFC 4033.
*/
enum dnssec_status_t {
/**
* The validating resolver has a trust anchor, has a chain of
* trust, and is able to verify all the signatures in the response.
* [RFC4033]
*/
SECURE,
/**
* The validating resolver has a trust anchor, a chain of
* trust, and, at some delegation point, signed proof of the
* non-existence of a DS record. This indicates that subsequent
* branches in the tree are provably insecure. A validating resolver
* may have a local policy to mark parts of the domain space as
* insecure. [RFC4033]
*/
INSECURE,
/**
* The validating resolver has a trust anchor and a secure
* delegation indicating that subsidiary data is signed, but the
* response fails to validate for some reason: missing signatures,
* expired signatures, signatures with unsupported algorithms, data
* missing that the relevant NSEC RR says should be present, and so
* forth. [RFC4033]
*/
BOGUS,
/**
* There is no trust anchor that would indicate that a
* specific portion of the tree is secure. This is the default
* operation mode. [RFC4033]
*/
INDETERMINATE,
};
/**
* A response of the DNS resolver to a DNS query.
*
* A response represents the answer of the Domain Name System to a query.
* It contains the RRset with the queried Resource Records and additional
* information.
*/
struct resolver_response_t {
/**
* Get the original question string.
*
* The string to which the returned pointer points, is still owned
* by the resolver_response. Clone it if necessary.
*
* @return the queried name
*/
char *(*get_query_name)(resolver_response_t *this);
/**
* Get the canonical name of the result.
*
* The string to which the returned pointer points, is still owned
* by the resolver_response. Clone it if necessary.
*
* @return - canonical name of result
* - NULL, if result has no canonical name
*/
char *(*get_canon_name)(resolver_response_t *this);
/**
* Does the RRset of this response contain some Resource Records?
*
* Returns TRUE if the RRset of this response contains some RRs
* (RRSIG Resource Records are ignored).
*
* @return
* - TRUE, if there are some RRs in the RRset
* - FALSE, otherwise
*/
bool (*has_data)(resolver_response_t *this);
/**
* Does the queried name exist?
*
* @return
* - TRUE, if the queried name exists
* - FALSE, otherwise
*/
bool (*query_name_exist)(resolver_response_t *this);
/**
* Get the DNSSEC security state of the response.
*
* @return DNSSEC security state
*/
dnssec_status_t (*get_security_state)(resolver_response_t *this);
/**
* Get the RRset with all Resource Records of this response.
*
* @return - RRset
* - NULL if there is no data or the query name
* does not exist
*/
rr_set_t *(*get_rr_set)(resolver_response_t *this);
/**
* Destroy this response.
*/
void (*destroy) (resolver_response_t *this);
};
#endif /** RR_SET_H_ @}*/
|
