usr.sbin/802_11/wpa_supplicant/Packet32.c

   1 /*-
   2  * Copyright (c) 2005
   3  *      Bill Paul <wpaul@windriver.com>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/usr.sbin/wpa/wpa_supplicant/Packet32.c,v 1.4 2007/07/11 16:04:08 sam Exp $
  33  * $DragonFly: src/usr.sbin/802_11/wpa_supplicant/Packet32.c,v 1.3 2007/08/07 11:25:37 sephe Exp $
  34  */
  35
  36 /*
  37  * This file implements a small portion of the Winpcap API for the
  38  * Windows NDIS interface in wpa_supplicant. It provides just enough
  39  * routines to fool wpa_supplicant into thinking it's really running
  40  * in a Windows environment.
  41  */
  42
  43 #include <sys/types.h>
  44 #include <sys/param.h>
  45 #include <sys/socket.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/socket.h>
  48 #include <sys/errno.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/fcntl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_dl.h>
  54 #include <net/if_var.h>
  55
  56 #include <netinet/in.h>
  57 #include <arpa/inet.h>
  58 #include <netdb.h>
  59 #include <net/route.h>
  60
  61 #include <netproto/802_11/ieee80211_ioctl.h>
  62
  63 #include <stdio.h>
  64 #include <string.h>
  65 #include <stdlib.h>
  66 #include <unistd.h>
  67 #include <pcap.h>
  68
  69 #include "Packet32.h"
  70
  71 #define OID_802_11_ADD_KEY      0x0d01011D
  72
  73 typedef ULONGLONG NDIS_802_11_KEY_RSC;
  74 typedef UCHAR NDIS_802_11_MAC_ADDRESS[6];
  75
  76 typedef struct NDIS_802_11_KEY {
  77         ULONG Length;
  78         ULONG KeyIndex;
  79         ULONG KeyLength;
  80         NDIS_802_11_MAC_ADDRESS BSSID;
  81         NDIS_802_11_KEY_RSC KeyRSC;
  82         UCHAR KeyMaterial[1];
  83 } NDIS_802_11_KEY;
  84
  85 typedef struct NDIS_802_11_KEY_COMPAT {
  86         ULONG Length;
  87         ULONG KeyIndex;
  88         ULONG KeyLength;
  89         NDIS_802_11_MAC_ADDRESS BSSID;
  90         UCHAR Pad[6]; /* Make struct layout match Windows. */
  91         NDIS_802_11_KEY_RSC KeyRSC;
  92 #ifdef notdef
  93         UCHAR KeyMaterial[1];
  94 #endif
  95 } NDIS_802_11_KEY_COMPAT;
  96
  97 #define TRUE 1
  98 #define FALSE 0
  99
 100 struct adapter {
 101         int                     socket;
 102         char                    name[IFNAMSIZ];
 103         int                     prev_roaming;
 104 };
 105
 106 PCHAR
 107 PacketGetVersion(void)
 108 {
 109         return("FreeBSD WinPcap compatibility shim v1.0");
 110 }
 111
 112 void *
 113 PacketOpenAdapter(iface)
 114         CHAR                    *iface;
 115 {
 116         struct adapter          *a;
 117         int                     s;
 118         int                     ifflags;
 119         struct ifreq            ifr;
 120         struct ieee80211req     ireq;
 121
 122         s = socket(PF_INET, SOCK_DGRAM, 0);
 123
 124         if (s == -1)
 125                 return(NULL);
 126
 127         a = malloc(sizeof(struct adapter));
 128         if (a == NULL)
 129                 return(NULL);
 130
 131         a->socket = s;
 132         if (strncmp(iface, "\\Device\\NPF_", 12) == 0)
 133                 iface += 12;
 134         else if (strncmp(iface, "\\DEVICE\\", 8) == 0)
 135                 iface += 8;
 136         snprintf(a->name, IFNAMSIZ, "%s", iface);
 137
 138         /* Turn off net80211 roaming */
 139         bzero((char *)&ireq, sizeof(ireq));
 140         strncpy(ireq.i_name, iface, sizeof (ifr.ifr_name));
 141         ireq.i_type = IEEE80211_IOC_ROAMING;
 142         if (ioctl(a->socket, SIOCG80211, &ireq) == 0) {
 143                 a->prev_roaming = ireq.i_val;
 144                 ireq.i_val = IEEE80211_ROAMING_MANUAL;
 145                 if (ioctl(a->socket, SIOCS80211, &ireq) < 0)
 146                         fprintf(stderr,
 147                             "Could not set IEEE80211_ROAMING_MANUAL\n");
 148         }
 149
 150         bzero((char *)&ifr, sizeof(ifr));
 151         strncpy(ifr.ifr_name, iface, sizeof (ifr.ifr_name));
 152         if (ioctl(a->socket, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 153                 free(a);
 154                 close(s);
 155                 return(NULL);
 156         }
 157         ifr.ifr_flags |= IFF_UP;
 158         if (ioctl(a->socket, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 159                 free(a);
 160                 close(s);
 161                 return(NULL);
 162         }
 163
 164         return(a);
 165 }
 166
 167 int
 168 PacketRequest(iface, set, oid)
 169         void                    *iface;
 170         BOOLEAN                 set;
 171         PACKET_OID_DATA         *oid;
 172 {
 173         struct adapter          *a;
 174         uint32_t                retval;
 175         struct ifreq            ifr;
 176         NDIS_802_11_KEY         *old;
 177         NDIS_802_11_KEY_COMPAT  *new;
 178         PACKET_OID_DATA         *o = NULL;
 179
 180         if (iface == NULL)
 181                 return(-1);
 182
 183         a = iface;
 184         bzero((char *)&ifr, sizeof(ifr));
 185
 186         /*
 187          * This hack is necessary to work around a difference
 188          * betwee the GNU C and Microsoft C compilers. The NDIS_802_11_KEY
 189          * structure has a uint64_t in it, right after an array of
 190          * chars. The Microsoft compiler inserts padding right before
 191          * the 64-bit value to align it on a 64-bit boundary, but
 192          * GCC only aligns it on a 32-bit boundary. Trying to pass
 193          * the GCC-formatted structure to an NDIS binary driver
 194          * fails because some of the fields appear to be at the
 195          * wrong offsets.
 196          *
 197          * To get around this, if we detect someone is trying to do
 198          * a set operation on OID_802_11_ADD_KEY, we shuffle the data
 199          * into a properly padded structure and pass that into the
 200          * driver instead. This allows the driver_ndis.c code supplied
 201          * with wpa_supplicant to work unmodified.
 202          */
 203
 204         if (set == TRUE && oid->Oid == OID_802_11_ADD_KEY) {
 205                 old = (NDIS_802_11_KEY *)&oid->Data;
 206                 o = malloc(sizeof(PACKET_OID_DATA) +
 207                     sizeof(NDIS_802_11_KEY_COMPAT) + old->KeyLength);
 208                 if (o == NULL)
 209                         return(0);
 210                 bzero((char *)o, sizeof(PACKET_OID_DATA) +
 211                     sizeof(NDIS_802_11_KEY_COMPAT) + old->KeyLength);
 212                 o->Oid = oid->Oid;
 213                 o->Length = sizeof(NDIS_802_11_KEY_COMPAT) + old->KeyLength;
 214                 new = (NDIS_802_11_KEY_COMPAT *)&o->Data;
 215                 new->KeyRSC = old->KeyRSC;
 216                 new->Length = o->Length;
 217                 new->KeyIndex = old->KeyIndex;
 218                 new->KeyLength = old->KeyLength;
 219                 bcopy(old->BSSID, new->BSSID, sizeof(NDIS_802_11_MAC_ADDRESS));
 220                 bcopy(old->KeyMaterial, (char *)new +
 221                     sizeof(NDIS_802_11_KEY_COMPAT), new->KeyLength);
 222                 ifr.ifr_data = (caddr_t)o;
 223         } else
 224                 ifr.ifr_data = (caddr_t)oid;
 225
 226         strlcpy(ifr.ifr_name, a->name, sizeof(ifr.ifr_name));
 227
 228         if (set == TRUE)
 229                 retval = ioctl(a->socket, SIOCSDRVSPEC, &ifr);
 230         else
 231                 retval = ioctl(a->socket, SIOCGDRVSPEC, &ifr);
 232
 233         if (o != NULL)
 234                 free(o);
 235
 236         if (retval)
 237                 return(0);
 238
 239         return(1);
 240 }
 241
 242 int
 243 PacketGetAdapterNames(namelist, len)
 244         CHAR                    *namelist;
 245         ULONG                   *len;
 246 {
 247         int                     mib[6];
 248         size_t                  needed;
 249         struct if_msghdr        *ifm;
 250         struct sockaddr_dl      *sdl;
 251         char                    *buf, *lim, *next;
 252         char                    *plist;
 253         int                     spc;
 254         int                     i, ifcnt = 0;
 255
 256         plist = namelist;
 257         spc = 0;
 258
 259         bzero(plist, *len);
 260
 261         needed = 0;
 262         mib[0] = CTL_NET;
 263         mib[1] = PF_ROUTE;
 264         mib[2] = 0;             /* protocol */
 265         mib[3] = 0;             /* wildcard address family */
 266         mib[4] = NET_RT_IFLIST;
 267         mib[5] = 0;             /* no flags */
 268
 269         if (sysctl (mib, 6, NULL, &needed, NULL, 0) < 0)
 270                 return(FALSE);
 271
 272         buf = malloc (needed);
 273         if (buf == NULL)
 274                 return(FALSE);
 275
 276         if (sysctl (mib, 6, buf, &needed, NULL, 0) < 0) {
 277                 free(buf);
 278                 return(FALSE);
 279         }
 280
 281         lim = buf + needed;
 282
 283         /* Generate interface name list. */
 284
 285         next = buf;
 286         while (next < lim) {
 287                 ifm = (struct if_msghdr *)next;
 288                 if (ifm->ifm_type == RTM_IFINFO) {
 289                         sdl = (struct sockaddr_dl *)(ifm + 1);
 290                         if (strnstr(sdl->sdl_data, "ndis", sdl->sdl_nlen)) {
 291                                 if ((spc + sdl->sdl_nlen) > *len) {
 292                                         free(buf);
 293                                         return(FALSE);
 294                                 }
 295                                 strncpy(plist, sdl->sdl_data, sdl->sdl_nlen);
 296                                 plist += (sdl->sdl_nlen + 1);
 297                                 spc += (sdl->sdl_nlen + 1);
 298                                 ifcnt++;
 299                         }
 300                 }
 301                 next += ifm->ifm_msglen;
 302         }
 303
 304
 305         /* Insert an extra "" as a spacer */
 306
 307         plist++;
 308         spc++;
 309
 310         /*
 311          * Now generate the interface description list. There
 312          * must be a unique description for each interface, and
 313          * they have to match what the ndis_events program will
 314          * feed in later. To keep this simple, we just repeat
 315          * the interface list over again.
 316          */
 317
 318         next = buf;
 319         while (next < lim) {
 320                 ifm = (struct if_msghdr *)next;
 321                 if (ifm->ifm_type == RTM_IFINFO) {
 322                         sdl = (struct sockaddr_dl *)(ifm + 1);
 323                         if (strnstr(sdl->sdl_data, "ndis", sdl->sdl_nlen)) {
 324                                 if ((spc + sdl->sdl_nlen) > *len) {
 325                                         free(buf);
 326                                         return(FALSE);
 327                                 }
 328                                 strncpy(plist, sdl->sdl_data, sdl->sdl_nlen);
 329                                 plist += (sdl->sdl_nlen + 1);
 330                                 spc += (sdl->sdl_nlen + 1);
 331                                 ifcnt++;
 332                         }
 333                 }
 334                 next += ifm->ifm_msglen;
 335         }
 336
 337         free (buf);
 338
 339         *len = spc + 1;
 340
 341         return(TRUE);
 342 }
 343
 344 void
 345 PacketCloseAdapter(iface)
 346         void                    *iface;
 347 {
 348         struct adapter          *a;
 349         struct ifreq            ifr;
 350         struct ieee80211req     ireq;
 351
 352         if (iface == NULL)
 353                 return;
 354
 355         a = iface;
 356
 357         /* Reset net80211 roaming */
 358         bzero((char *)&ireq, sizeof(ireq));
 359         strncpy(ireq.i_name, a->name, sizeof (ifr.ifr_name));
 360         ireq.i_type = IEEE80211_IOC_ROAMING;
 361         ireq.i_val = a->prev_roaming;
 362         ioctl(a->socket, SIOCS80211, &ireq);
 363
 364         bzero((char *)&ifr, sizeof(ifr));
 365         strncpy(ifr.ifr_name, a->name, sizeof (ifr.ifr_name));
 366         ioctl(a->socket, SIOCGIFFLAGS, (caddr_t)&ifr);
 367         ifr.ifr_flags &= ~IFF_UP;
 368         ioctl(a->socket, SIOCSIFFLAGS, (caddr_t)&ifr);
 369         close(a->socket);
 370         free(a);
 371
 372         return;
 373 }