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 }
 127
 128 struct iwinfo_hardware_entry * iwinfo_hardware(struct iwinfo_hardware_id *id)
 129 {
 130         const struct iwinfo_hardware_entry *e;
 131
 132         for (e = IWINFO_HARDWARE_ENTRIES; e->vendor_name; e++)
 133         {
 134                 if ((e->vendor_id != 0xffff) && (e->vendor_id != id->vendor_id))
 135                         continue;
 136
 137                 if ((e->device_id != 0xffff) && (e->device_id != id->device_id))
 138                         continue;
 139
 140                 if ((e->subsystem_vendor_id != 0xffff) &&
 141                         (e->subsystem_vendor_id != id->subsystem_vendor_id))
 142                         continue;
 143
 144                 if ((e->subsystem_device_id != 0xffff) &&
 145                         (e->subsystem_device_id != id->subsystem_device_id))
 146                         continue;
 147
 148                 return e;
 149         }
 150
 151         return NULL;
 152 }