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
|
/* res_query_dump.c
* Simple program to dump res_query(3) response
*
* Copyright (C) 2014 Dmitry Podgorny <pasis.ua@gmail.com>
*
* This software is provided AS-IS with no warranty, either express
* or implied.
*
* This program is dual licensed under the MIT and GPLv3 licenses.
*/
/* Linux and OSX:
* gcc -o res_query_dump tests/res_query_dump.c -lresolv
* *BSD:
* gcc -o res_query_dump tests/res_query_dump.c
* QNX:
* gcc -o res_query_dump tests/res_query_dump.c -lsocket
* Solaris:
* gcc -o res_query_dump tests/res_query_dump.c -lresolv -lsocket -lnsl
*/
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifndef T_SRV
#define T_SRV 33
#endif /* T_SRV */
#ifndef C_IN
#define C_IN 1
#endif /* C_IN */
#define STEP 10
int main(int argc, char **argv)
{
unsigned char buf[65536];
char fulldomain[2048];
char *service = "xmpp-client";
char *proto = "tcp";
char *domain = NULL;
int len;
int i;
int j;
if (argc < 2) {
fprintf(stderr, "%s: argument missed\n", argc > 0 ? argv[0] : "$0");
fprintf(stderr, "Usage: %s <domain>\n", argc > 0 ? argv[0] : "$0");
return 1;
}
domain = argv[1];
snprintf(fulldomain, sizeof(fulldomain), "_%s._%s.%s",
service, proto, domain);
errno = 0;
len = res_query(fulldomain, C_IN, T_SRV, buf, sizeof(buf));
if (len < 0) {
fprintf(stderr, "res_query(): Error occurred (errno=%d)\n", errno);
}
if (len == 0) {
fprintf(stderr, "res_query(): Empty result\n");
}
if (len > 0) {
printf("/* res_query(\"%s\", C_IN, T_SRV, ...) */\n", fulldomain);
printf("static const unsigned char data[] = {\n");
for (i = 0; i < len; i += STEP) {
printf(" ");
for (j = i; j < len && j < i + STEP; ++j) {
printf(" 0x%02x,", buf[j]);
}
for (j = len; j < i + STEP; ++j) {
printf(" ");
}
printf(" // ");
for (j = i; j < len && j < i + STEP; ++j) {
printf("%c", isprint(buf[j]) ? buf[j] : '.');
}
printf("\n");
}
printf("};\n");
}
return len <= 0;
}
|
