[package] add libiwinfo (moved from LuCI trunk)
[openwrt/svn-archive/archive.git] / package / iwinfo / src / iwinfo_utils.c
1 /*
2 * iwinfo - Wireless Information Library - Shared utility routines
3 *
4 * Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
5 *
6 * The iwinfo library is free software: you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * The iwinfo library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with the iwinfo library. If not, see http://www.gnu.org/licenses/.
17 *
18 * The signal handling code is derived from the official madwifi tools,
19 * wlanconfig.c in particular. The encryption property handling was
20 * inspired by the hostapd madwifi driver.
21 */
22
23 #include "iwinfo/utils.h"
24
25
26 static int ioctl_socket = -1;
27
28 static int iwinfo_ioctl_socket(void)
29 {
30 /* Prepare socket */
31 if( ioctl_socket == -1 )
32 {
33 ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
34 fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
35 }
36
37 return ioctl_socket;
38 }
39
40 int iwinfo_ioctl(int cmd, void *ifr)
41 {
42 int s = iwinfo_ioctl_socket();
43 return ioctl(s, cmd, ifr);
44 }
45
46 int iwinfo_dbm2mw(int in)
47 {
48 double res = 1.0;
49 int ip = in / 10;
50 int fp = in % 10;
51 int k;
52
53 for(k = 0; k < ip; k++) res *= 10;
54 for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
55
56 return (int)res;
57 }
58
59 int iwinfo_mw2dbm(int in)
60 {
61 double fin = (double) in;
62 int res = 0;
63
64 while(fin > 10.0)
65 {
66 res += 10;
67 fin /= 10.0;
68 }
69
70 while(fin > 1.000001)
71 {
72 res += 1;
73 fin /= LOG10_MAGIC;
74 }
75
76 return (int)res;
77 }
78
79 int iwinfo_ifup(const char *ifname)
80 {
81 struct ifreq ifr;
82
83 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
84
85 if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
86 return 0;
87
88 ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
89
90 return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
91 }
92
93 int iwinfo_ifdown(const char *ifname)
94 {
95 struct ifreq ifr;
96
97 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
98
99 if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
100 return 0;
101
102 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
103
104 return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
105 }
106
107 int iwinfo_ifmac(const char *ifname)
108 {
109 struct ifreq ifr;
110
111 strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
112
113 if( iwinfo_ioctl(SIOCGIFHWADDR, &ifr) )
114 return 0;
115
116 ifr.ifr_hwaddr.sa_data[1]++;
117 ifr.ifr_hwaddr.sa_data[2]++;
118
119 return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
120 }
121
122 void iwinfo_close(void)
123 {
124 if( ioctl_socket > -1 )
125 close(ioctl_socket);
126 }