-
Notifications
You must be signed in to change notification settings - Fork 0
/
linux.c
83 lines (75 loc) · 2.6 KB
/
linux.c
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
/* linux.c - Linux-specific functions
*
* Copyright (c) 2005-2013 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <errno.h>
#include "defines.h"
#include "config.h"
#include "log.h"
#include "strl.h"
#include "util.h"
#include "malloc.h"
/* allocates from heap for return */
char *get_interface_ip(char *ifname)
{
struct ifreq ifr;
char *ip = NULL, *ret = NULL;
int fd, len;
if (ifname == NULL)
goto out;
fd = socket(PF_INET, SOCK_DGRAM, 0);
if (fd == -1) {
log_line("%s: (%s) failed to open interface socket: %s",
ifname, __func__, strerror(errno));
goto out;
}
strnkcpy(ifr.ifr_name, ifname, IFNAMSIZ);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
log_line("%s: (%s) SIOCGIFADDR failed: %s",
ifname, __func__, strerror(errno));
goto outfd;
}
ip = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);
len = strlen(ip) + 1;
ret = xmalloc(len);
strnkcpy(ret, ip, len);
outfd:
close(fd);
out:
return ret;
}