mirror of https://github.com/hak5/openwrt.git
127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
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/*
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* iwinfo - Wireless Information Library - Shared utility routines
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*
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* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
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*
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* The iwinfo library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* The iwinfo library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the iwinfo library. If not, see http://www.gnu.org/licenses/.
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*
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* The signal handling code is derived from the official madwifi tools,
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* wlanconfig.c in particular. The encryption property handling was
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* inspired by the hostapd madwifi driver.
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*/
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#include "iwinfo/utils.h"
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static int ioctl_socket = -1;
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static int iwinfo_ioctl_socket(void)
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{
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/* Prepare socket */
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if( ioctl_socket == -1 )
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{
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ioctl_socket = socket(AF_INET, SOCK_DGRAM, 0);
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fcntl(ioctl_socket, F_SETFD, fcntl(ioctl_socket, F_GETFD) | FD_CLOEXEC);
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}
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return ioctl_socket;
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}
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int iwinfo_ioctl(int cmd, void *ifr)
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{
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int s = iwinfo_ioctl_socket();
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return ioctl(s, cmd, ifr);
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}
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int iwinfo_dbm2mw(int in)
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{
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double res = 1.0;
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int ip = in / 10;
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int fp = in % 10;
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int k;
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for(k = 0; k < ip; k++) res *= 10;
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for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
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return (int)res;
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}
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int iwinfo_mw2dbm(int in)
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{
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double fin = (double) in;
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int res = 0;
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while(fin > 10.0)
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{
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res += 10;
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fin /= 10.0;
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}
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while(fin > 1.000001)
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{
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res += 1;
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fin /= LOG10_MAGIC;
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}
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return (int)res;
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}
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int iwinfo_ifup(const char *ifname)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
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return 0;
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ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
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return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
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}
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int iwinfo_ifdown(const char *ifname)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if( iwinfo_ioctl(SIOCGIFFLAGS, &ifr) )
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return 0;
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ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
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return !iwinfo_ioctl(SIOCSIFFLAGS, &ifr);
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}
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int iwinfo_ifmac(const char *ifname)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if( iwinfo_ioctl(SIOCGIFHWADDR, &ifr) )
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return 0;
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ifr.ifr_hwaddr.sa_data[1]++;
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ifr.ifr_hwaddr.sa_data[2]++;
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return !iwinfo_ioctl(SIOCSIFHWADDR, &ifr);
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}
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void iwinfo_close(void)
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{
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if( ioctl_socket > -1 )
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close(ioctl_socket);
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}
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