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) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: dns.c,v 1.5 2006/03/09 23:57:56 marka Exp $";
#endif
/*! \file
* \brief
* dns.c --- this is the top-level accessor function for the dns
*/
#include "port_before.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <resolv.h>
#include <isc/memcluster.h>
#include <irs.h>
#include "port_after.h"
#include "irs_p.h"
#include "hesiod.h"
#include "dns_p.h"
/* forward */
static void dns_close(struct irs_acc *);
static struct __res_state * dns_res_get(struct irs_acc *);
static void dns_res_set(struct irs_acc *, struct __res_state *,
void (*)(void *));
/* public */
struct irs_acc *
irs_dns_acc(const char *options) {
struct irs_acc *acc;
struct dns_p *dns;
UNUSED(options);
if (!(acc = memget(sizeof *acc))) {
errno = ENOMEM;
return (NULL);
}
memset(acc, 0x5e, sizeof *acc);
if (!(dns = memget(sizeof *dns))) {
errno = ENOMEM;
memput(acc, sizeof *acc);
return (NULL);
}
memset(dns, 0x5e, sizeof *dns);
dns->res = NULL;
dns->free_res = NULL;
if (hesiod_init(&dns->hes_ctx) < 0) {
/*
* We allow the dns accessor class to initialize
* despite hesiod failing to initialize correctly,
* since dns host queries don't depend on hesiod.
*/
dns->hes_ctx = NULL;
}
acc->private = dns;
#ifdef WANT_IRS_GR
acc->gr_map = irs_dns_gr;
#else
acc->gr_map = NULL;
#endif
#ifdef WANT_IRS_PW
acc->pw_map = irs_dns_pw;
#else
acc->pw_map = NULL;
#endif
acc->sv_map = irs_dns_sv;
acc->pr_map = irs_dns_pr;
acc->ho_map = irs_dns_ho;
acc->nw_map = irs_dns_nw;
acc->ng_map = irs_nul_ng;
acc->res_get = dns_res_get;
acc->res_set = dns_res_set;
acc->close = dns_close;
return (acc);
}
/* methods */
static struct __res_state *
dns_res_get(struct irs_acc *this) {
struct dns_p *dns = (struct dns_p *)this->private;
if (dns->res == NULL) {
struct __res_state *res;
res = (struct __res_state *)malloc(sizeof *res);
if (res == NULL)
return (NULL);
memset(res, 0, sizeof *res);
dns_res_set(this, res, free);
}
if ((dns->res->options & RES_INIT) == 0U &&
res_ninit(dns->res) < 0)
return (NULL);
return (dns->res);
}
static void
dns_res_set(struct irs_acc *this, struct __res_state *res,
void (*free_res)(void *)) {
struct dns_p *dns = (struct dns_p *)this->private;
if (dns->res && dns->free_res) {
res_nclose(dns->res);
(*dns->free_res)(dns->res);
}
dns->res = res;
dns->free_res = free_res;
}
static void
dns_close(struct irs_acc *this) {
struct dns_p *dns;
dns = (struct dns_p *)this->private;
if (dns->res && dns->free_res)
(*dns->free_res)(dns->res);
if (dns->hes_ctx)
hesiod_end(dns->hes_ctx);
memput(dns, sizeof *dns);
memput(this, sizeof *this);
}
|
