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
|
/*
* Copyright 2018 IoT.bzh <jose.bollo@iot.bzh>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <netdb.h>
void dumphostent(char *tag, char *arg, struct hostent *h)
{
printf("\n----------------- %s %s\n", tag, arg);
if (h) {
printf("name: %s\n", h->h_name);
if (h->h_addrtype == AF_INET)
printf("ipv4: %d.%d.%d.%d\n",
(int)(unsigned char)h->h_addr_list[0][0],
(int)(unsigned char)h->h_addr_list[0][1],
(int)(unsigned char)h->h_addr_list[0][2],
(int)(unsigned char)h->h_addr_list[0][3]);
} else {
printf("NULL!\n");
}
printf("\n");
}
int main(int ac, char **av)
{
struct hostent *h;
while (*++av) {
h = gethostbyname2(*av, AF_INET);
dumphostent("name->addr", *av, h);
if (h) {
h = gethostbyaddr(h->h_addr_list[0], h->h_length, h->h_addrtype);
dumphostent("addr->name", *av, h);
}
}
return 0;
}
|
