/* * 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); }