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