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
|
/* $OpenBSD: res_query.c,v 1.4 2013/05/27 17:31:01 eric Exp $ */
/*
* Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
*
* 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include "asr.h"
int
res_query(const char *name, int class, int type, u_char *ans, int anslen)
{
struct async *as;
struct async_res ar;
size_t len;
res_init();
if (ans == NULL || anslen <= 0) {
h_errno = NO_RECOVERY;
errno = EINVAL;
return (-1);
}
as = res_query_async(name, class, type, NULL);
if (as == NULL) {
if (errno == EINVAL)
h_errno = NO_RECOVERY;
else
h_errno = NETDB_INTERNAL;
return (-1); /* errno set */
}
async_run_sync(as, &ar);
if (ar.ar_errno)
errno = ar.ar_errno;
h_errno = ar.ar_h_errno;
if (ar.ar_h_errno != NETDB_SUCCESS)
return (-1);
len = anslen;
if (ar.ar_datalen < len)
len = ar.ar_datalen;
memmove(ans, ar.ar_data, len);
free(ar.ar_data);
return (ar.ar_datalen);
}
int
res_search(const char *name, int class, int type, u_char *ans, int anslen)
{
struct async *as;
struct async_res ar;
size_t len;
res_init();
if (ans == NULL || anslen <= 0) {
h_errno = NO_RECOVERY;
errno = EINVAL;
return (-1);
}
as = res_search_async(name, class, type, NULL);
if (as == NULL) {
if (errno == EINVAL)
h_errno = NO_RECOVERY;
else
h_errno = NETDB_INTERNAL;
return (-1); /* errno set */
}
async_run_sync(as, &ar);
if (ar.ar_errno)
errno = ar.ar_errno;
h_errno = ar.ar_h_errno;
if (ar.ar_h_errno != NETDB_SUCCESS)
return (-1);
len = anslen;
if (ar.ar_datalen < len)
len = ar.ar_datalen;
memmove(ans, ar.ar_data, len);
free(ar.ar_data);
return (ar.ar_datalen);
}
|
