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/*
* iwinfo - Wireless Information Library - Shared utility routines
*
* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
*
* The iwinfo library is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* The iwinfo library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the iwinfo library. If not, see http://www.gnu.org/licenses/.
*
* The signal handling code is derived from the official madwifi tools,
* wlanconfig.c in particular. The encryption property handling was
* inspired by the hostapd madwifi driver.
*/
#include "iwinfo/utils.h"
static int ioctl_socket = -1;
static int iwinfo_ioctl_socket(void)
{
/* Prepare socket */
if( ioctl_socket == -1 )
{
ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
}
return ioctl_socket;
}
int iwinfo_ioctl(int cmd, void *ifr)
{
int s = iwinfo_ioctl_socket();
return ioctl(s, cmd, ifr);
}
int iwinfo_dbm2mw(int in)
{
double res = 1.0;
int ip = in / 10;
int fp = in % 10;
int k;
for(k = 0; k < ip; k++) res *= 10;
for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
return (int)res;
}
int iwinfo_mw2dbm(int in)
{
double fin = (double) in;
int res = 0;
while(fin > 10.0)
{
res += 10;
fin /= 10.0;
}
while(fin > 1.000001)
{
res += 1;
fin /= LOG10_MAGIC;
}
return (int)res;
}
int iwinfo_ifup(const char *ifname)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
return 0;
ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
}
int iwinfo_ifdown(const char *ifname)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
return 0;
ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
}
int iwinfo_ifmac(const char *ifname)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if( iwinfo_ioctl(SIOCGIFHWADDR, &ifr) )
return 0;
ifr.ifr_hwaddr.sa_data[1]++;
ifr.ifr_hwaddr.sa_data[2]++;
return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
}
void iwinfo_close(void)
{
if( ioctl_socket > -1 )
close(ioctl_socket);
}
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