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
|
/*
* Copyright (C) 2011-2012 Reto Guadagnini
* 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.
*/
#include <unbound.h>
#include <errno.h>
#include <ldns/ldns.h>
#include <string.h>
#include <library.h>
#include <utils/debug.h>
#include "unbound_resolver.h"
#include "unbound_response.h"
/* DNS resolver configuration and DNSSEC trust anchors */
#define RESOLV_CONF_FILE "/etc/resolv.conf"
#define TRUST_ANCHOR_FILE IPSEC_CONFDIR "/ipsec.d/dnssec.keys"
typedef struct private_resolver_t private_resolver_t;
/**
* private data of a unbound_resolver_t object.
*/
struct private_resolver_t {
/**
* Public data
*/
resolver_t public;
/**
* private unbound resolver handle (unbound context)
*/
struct ub_ctx *ctx;
};
/**
* query method implementation
*/
METHOD(resolver_t, query, resolver_response_t*,
private_resolver_t *this, char *domain, rr_class_t rr_class,
rr_type_t rr_type)
{
unbound_response_t *response = NULL;
struct ub_result *result = NULL;
int ub_retval;
ub_retval = ub_resolve(this->ctx, domain, rr_type, rr_class, &result);
if (ub_retval)
{
DBG1(DBG_LIB, "unbound resolver error: %s", ub_strerror(ub_retval));
ub_resolve_free(result);
return NULL;
}
response = unbound_response_create_frm_libub_response(result);
if (!response)
{
DBG1(DBG_LIB, "unbound resolver failed to create response");
ub_resolve_free(result);
return NULL;
}
ub_resolve_free(result);
return (resolver_response_t*)response;
}
/**
* destroy method implementation
*/
METHOD(resolver_t, destroy, void,
private_resolver_t *this)
{
ub_ctx_delete(this->ctx);
free(this);
}
/*
* Described in header.
*/
resolver_t *unbound_resolver_create(void)
{
private_resolver_t *this;
int ub_retval = 0;
char *resolv_conf, *trust_anchors, *dlv_anchors;
resolv_conf = lib->settings->get_str(lib->settings,
"%s.plugins.unbound.resolv_conf",
RESOLV_CONF_FILE, lib->ns);
trust_anchors = lib->settings->get_str(lib->settings,
"%s.plugins.unbound.trust_anchors",
TRUST_ANCHOR_FILE, lib->ns);
dlv_anchors = lib->settings->get_str(lib->settings,
"%s.plugins.unbound.dlv_anchors",
NULL, lib->ns);
INIT(this,
.public = {
.query = _query,
.destroy = _destroy,
},
);
this->ctx = ub_ctx_create();
if (!this->ctx)
{
DBG1(DBG_LIB, "failed to create unbound resolver context");
destroy(this);
return NULL;
}
DBG2(DBG_CFG, "loading unbound resolver config from '%s'", resolv_conf);
ub_retval = ub_ctx_resolvconf(this->ctx, resolv_conf);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to read the resolver config: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
destroy(this);
return NULL;
}
DBG2(DBG_CFG, "loading unbound trust anchors from '%s'", trust_anchors);
ub_retval = ub_ctx_add_ta_file(this->ctx, trust_anchors);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to load trust anchors: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
}
if (dlv_anchors)
{
DBG2(DBG_CFG, "loading trusted keys for DLV from '%s'", dlv_anchors);
ub_retval = ub_ctx_set_option(this->ctx, "dlv-anchor-file:",
dlv_anchors);
if (ub_retval)
{
DBG1(DBG_CFG, "failed to load trusted keys for DLV: %s (%s)",
ub_strerror(ub_retval), strerror(errno));
}
}
return &this->public;
}
|
