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
|
/* $OpenBSD: gethostnamadr.c,v 1.1 2012/07/13 17:49:54 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 <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
static void
usage(void)
{
extern const char * __progname;
fprintf(stderr, "usage: %s [-46e] <host...>\n", __progname);
exit(1);
}
int
main(int argc, char *argv[])
{
int i, ch, isname, family = AF_INET;
struct hostent *h;
char *host;
char addr[16];
int addraf;
int addrlen;
while((ch = getopt(argc, argv, "46e")) != -1) {
switch(ch) {
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'e':
long_err += 1;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
for(i = 0; i < argc; i++) {
if (i)
printf("\n");
printf("===> \"%s\"\n", argv[i]);
host = gethostarg(argv[i]);
if (addr_from_str(addr, &addraf, &addrlen, argv[i]) == -1)
isname = 1;
else
isname = 0;
errno = 0;
h_errno = 0;
gai_errno = 0;
rrset_errno = 0;
if (isname)
h = gethostbyname2(host, family);
else
h = gethostbyaddr(addr, addrlen, addraf);
if (h)
print_hostent(h);
print_errors();
}
return (0);
}
int
addr_from_str(char *addr, int *family, int *len, const char *src)
{
if (inet_pton(AF_INET6, src, addr) == 1) {
*family = AF_INET6;
*len = 16;
return (0);
}
if (inet_pton(AF_INET, src, addr) == 1) {
*family = AF_INET;
*len = 4;
return (0);
}
return (-1);
}
|
