contrib/hostapd/src/drivers/driver_ndis_.c

   1 /*
   2  * WPA Supplicant - Windows/NDIS driver interface - event processing
   3  * Copyright (c) 2004-2005, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "driver.h"
  19 #include "eloop.h"
  20
  21 /* Keep this event processing in a separate file and without WinPcap headers to
  22  * avoid conflicts with some of the header files. */
  23 struct _ADAPTER;
  24 typedef struct _ADAPTER * LPADAPTER;
  25 #include "driver_ndis.h"
  26
  27
  28 void wpa_driver_ndis_event_connect(struct wpa_driver_ndis_data *drv);
  29 void wpa_driver_ndis_event_disconnect(struct wpa_driver_ndis_data *drv);
  30 void wpa_driver_ndis_event_media_specific(struct wpa_driver_ndis_data *drv,
  31                                           const u8 *data, size_t data_len);
  32 void wpa_driver_ndis_event_adapter_arrival(struct wpa_driver_ndis_data *drv);
  33 void wpa_driver_ndis_event_adapter_removal(struct wpa_driver_ndis_data *drv);
  34
  35
  36 enum event_types { EVENT_CONNECT, EVENT_DISCONNECT,
  37                    EVENT_MEDIA_SPECIFIC, EVENT_ADAPTER_ARRIVAL,
  38                    EVENT_ADAPTER_REMOVAL };
  39
  40 /* Event data:
  41  * enum event_types (as int, i.e., 4 octets)
  42  * data length (2 octets (big endian), optional)
  43  * data (variable len, optional)
  44  */
  45
  46
  47 static void wpa_driver_ndis_event_process(struct wpa_driver_ndis_data *drv,
  48                                           u8 *buf, size_t len)
  49 {
  50         u8 *pos, *data = NULL;
  51         enum event_types type;
  52         size_t data_len = 0;
  53
  54         wpa_hexdump(MSG_MSGDUMP, "NDIS: received event data", buf, len);
  55         if (len < sizeof(int))
  56                 return;
  57         type = *((int *) buf);
  58         pos = buf + sizeof(int);
  59         wpa_printf(MSG_DEBUG, "NDIS: event - type %d", type);
  60
  61         if (buf + len - pos > 2) {
  62                 data_len = (int) *pos++ << 8;
  63                 data_len += *pos++;
  64                 if (data_len > (size_t) (buf + len - pos)) {
  65                         wpa_printf(MSG_DEBUG, "NDIS: event data overflow");
  66                         return;
  67                 }
  68                 data = pos;
  69                 wpa_hexdump(MSG_MSGDUMP, "NDIS: event data", data, data_len);
  70         }
  71
  72         switch (type) {
  73         case EVENT_CONNECT:
  74                 wpa_driver_ndis_event_connect(drv);
  75                 break;
  76         case EVENT_DISCONNECT:
  77                 wpa_driver_ndis_event_disconnect(drv);
  78                 break;
  79         case EVENT_MEDIA_SPECIFIC:
  80                 wpa_driver_ndis_event_media_specific(drv, data, data_len);
  81                 break;
  82         case EVENT_ADAPTER_ARRIVAL:
  83                 wpa_driver_ndis_event_adapter_arrival(drv);
  84                 break;
  85         case EVENT_ADAPTER_REMOVAL:
  86                 wpa_driver_ndis_event_adapter_removal(drv);
  87                 break;
  88         }
  89 }
  90
  91
  92 void wpa_driver_ndis_event_pipe_cb(void *eloop_data, void *user_data)
  93 {
  94         struct wpa_driver_ndis_data *drv = eloop_data;
  95         u8 buf[512];
  96         DWORD len;
  97
  98         ResetEvent(drv->event_avail);
  99         if (ReadFile(drv->events_pipe, buf, sizeof(buf), &len, NULL))
 100                 wpa_driver_ndis_event_process(drv, buf, len);
 101         else {
 102                 wpa_printf(MSG_DEBUG, "%s: ReadFile() failed: %d", __func__,
 103                            (int) GetLastError());
 104         }
 105 }