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 (struct iwinfo_hardware_entry *)e;
 149         }
 150
 151         return NULL;
 152 }
 153
 154 int iwinfo_hardware_id_from_mtd(struct iwinfo_hardware_id *id)
 155 {
 156         FILE *mtd;
 157         uint16_t *bc;
 158
 159         int fd, len, off;
 160         char buf[128];
 161
 162         if (!(mtd = fopen("/proc/mtd", "r")))
 163                 return -1;
 164
 165         while (fgets(buf, sizeof(buf), mtd) > 0)
 166         {
 167                 if (fscanf(mtd, "mtd%d: %*x %x %127s", &off, &len, buf) < 3 ||
 168                     (strcmp(buf, "\"boardconfig\"") && strcmp(buf, "\"EEPROM\"")))
 169                 {
 170                         off = -1;
 171                         continue;
 172                 }
 173
 174                 break;
 175         }
 176
 177         fclose(mtd);
 178
 179         if (off < 0)
 180                 return -1;
 181
 182         snprintf(buf, sizeof(buf), "/dev/mtdblock%d", off);
 183
 184         if ((fd = open(buf, O_RDONLY)) < 0)
 185                 return -1;
 186
 187         bc = mmap(NULL, len, PROT_READ, MAP_PRIVATE|MAP_LOCKED, fd, 0);
 188
 189         if ((void *)bc != MAP_FAILED)
 190         {
 191                 id->vendor_id = 0;
 192                 id->device_id = 0;
 193
 194                 for (off = len / 2 - 0x800; off >= 0; off -= 0x800)
 195                 {
 196                         /* AR531X board data magic */
 197                         if ((bc[off] == 0x3533) && (bc[off + 1] == 0x3131))
 198                         {
 199                                 id->vendor_id = bc[off + 0x7d];
 200                                 id->device_id = bc[off + 0x7c];
 201                                 id->subsystem_vendor_id = bc[off + 0x84];
 202                                 id->subsystem_device_id = bc[off + 0x83];
 203                                 break;
 204                         }
 205
 206                         /* AR5416 EEPROM magic */
 207                         else if ((bc[off] == 0xA55A) || (bc[off] == 0x5AA5))
 208                         {
 209                                 id->vendor_id = bc[off + 0x0D];
 210                                 id->device_id = bc[off + 0x0E];
 211                                 id->subsystem_vendor_id = bc[off + 0x13];
 212                                 id->subsystem_device_id = bc[off + 0x14];
 213                                 break;
 214                         }
 215                 }
 216
 217                 munmap(bc, len);
 218         }
 219
 220         close(fd);
 221
 222         return (id->vendor_id && id->device_id) ? 0 : -1;
 223 }
 224
 225 void iwinfo_parse_rsn(struct iwinfo_crypto_entry *c, uint8_t *data, uint8_t len,
 226                                           uint8_t defcipher, uint8_t defauth)
 227 {
 228         uint16_t i, count;
 229
 230         static unsigned char ms_oui[3]        = { 0x00, 0x50, 0xf2 };
 231         static unsigned char ieee80211_oui[3] = { 0x00, 0x0f, 0xac };
 232
 233         data += 2;
 234         len -= 2;
 235
 236         if (!memcmp(data, ms_oui, 3))
 237                 c->wpa_version += 1;
 238         else if (!memcmp(data, ieee80211_oui, 3))
 239                 c->wpa_version += 2;
 240
 241         if (len < 4)
 242         {
 243                 c->group_ciphers |= defcipher;
 244                 c->pair_ciphers  |= defcipher;
 245                 c->auth_suites   |= defauth;
 246                 return;
 247         }
 248
 249         if (!memcmp(data, ms_oui, 3) || !memcmp(data, ieee80211_oui, 3))
 250         {
 251                 switch (data[3])
 252                 {
 253                         case 1: c->group_ciphers |= IWINFO_CIPHER_WEP40;  break;
 254                         case 2: c->group_ciphers |= IWINFO_CIPHER_TKIP;   break;
 255                         case 4: c->group_ciphers |= IWINFO_CIPHER_CCMP;   break;
 256                         case 5: c->group_ciphers |= IWINFO_CIPHER_WEP104; break;
 257                         case 6:  /* AES-128-CMAC */ break;
 258                         default: /* proprietary */  break;
 259                 }
 260         }
 261
 262         data += 4;
 263         len -= 4;
 264
 265         if (len < 2)
 266         {
 267                 c->pair_ciphers |= defcipher;
 268                 c->auth_suites  |= defauth;
 269                 return;
 270         }
 271
 272         count = data[0] | (data[1] << 8);
 273         if (2 + (count * 4) > len)
 274                 return;
 275
 276         for (i = 0; i < count; i++)
 277         {
 278                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 279                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 280                 {
 281                         switch (data[2 + (i * 4) + 3])
 282                         {
 283                                 case 1: c->pair_ciphers |= IWINFO_CIPHER_WEP40;  break;
 284                                 case 2: c->pair_ciphers |= IWINFO_CIPHER_TKIP;   break;
 285                                 case 4: c->pair_ciphers |= IWINFO_CIPHER_CCMP;   break;
 286                                 case 5: c->pair_ciphers |= IWINFO_CIPHER_WEP104; break;
 287                                 case 6:  /* AES-128-CMAC */ break;
 288                                 default: /* proprietary */  break;
 289                         }
 290                 }
 291         }
 292
 293         data += 2 + (count * 4);
 294         len -= 2 + (count * 4);
 295
 296         if (len < 2)
 297         {
 298                 c->auth_suites |= defauth;
 299                 return;
 300         }
 301
 302         count = data[0] | (data[1] << 8);
 303         if (2 + (count * 4) > len)
 304                 return;
 305
 306         for (i = 0; i < count; i++)
 307         {
 308                 if (!memcmp(data + 2 + (i * 4), ms_oui, 3) ||
 309                         !memcmp(data + 2 + (i * 4), ieee80211_oui, 3))
 310                 {
 311                         switch (data[2 + (i * 4) + 3])
 312                         {
 313                                 case 1: c->auth_suites |= IWINFO_KMGMT_8021x; break;
 314                                 case 2: c->auth_suites |= IWINFO_KMGMT_PSK;   break;
 315                                 case 3:  /* FT/IEEE 802.1X */                 break;
 316                                 case 4:  /* FT/PSK */                         break;
 317                                 case 5:  /* IEEE 802.1X/SHA-256 */            break;
 318                                 case 6:  /* PSK/SHA-256 */                    break;
 319                                 default: /* proprietary */                    break;
 320                         }
 321                 }
 322         }
 323
 324         data += 2 + (count * 4);
 325         len -= 2 + (count * 4);
 326 }