driver_ndis_.c

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/unistd.h>
#include <sys/types.h>
#ifndef CONFIG_NATIVE_WINDOWS
#include <sys/socket.h>
#include <netinet/in.h>
#endif /* CONFIG_NATIVE_WINDOWS */

#include "common.h"
#include "driver.h"
#include "wpa_supplicant.h"
#include "l2_packet.h"
#include "eloop.h"
#include "wpa.h"

/* Keep this event processing in a separate file and without WinPcap headers to
 * avoid conflicts with some of the header files. */
struct _ADAPTER;
typedef struct _ADAPTER * LPADAPTER;
#include "driver_ndis.h"


void wpa_driver_ndis_event_connect(struct wpa_driver_ndis_data *drv);
void wpa_driver_ndis_event_disconnect(struct wpa_driver_ndis_data *drv);
void wpa_driver_ndis_event_media_specific(struct wpa_driver_ndis_data *drv,
                                          const u8 *data, size_t data_len);


enum event_types { EVENT_CONNECT, EVENT_DISCONNECT,
                   EVENT_MEDIA_SPECIFIC };

/* Event data:
 * enum event_types (as int, i.e., 4 octets)
 * InstanceName length (1 octet)
 * InstanceName (variable len)
 * data length (1 octet, optional)
 * data (variable len, optional)
 */


static void wpa_driver_ndis_event_cb(int sock, void *eloop_ctx, void *sock_ctx)
{
        struct wpa_driver_ndis_data *drv = eloop_ctx;
        u8 buf[512], *pos, *data = NULL;
        int res, i, desc_len;
        enum event_types type;
        unsigned char instance_len;
        char *instance;
        size_t data_len = 0;

        res = recv(sock, buf, sizeof(buf), 0);
        if (res < 0) {
                perror("wpa_driver_ndis_event_cb - recv");
                return;
        }
        wpa_hexdump(MSG_MSGDUMP, "NDIS: received event data", buf, res);
        if (res < sizeof(int) + 1)
                return;
        type = *((int *) buf);
        pos = buf + sizeof(int);
        wpa_printf(MSG_DEBUG, "NDIS: event - type %d", type);
        instance_len = *pos++;
        if (instance_len > buf + res - pos) {
                wpa_printf(MSG_DEBUG, "NDIS: event InstanceName overflow");
                return;
        }
        instance = pos;
        pos += instance_len;
        wpa_hexdump_ascii(MSG_MSGDUMP, "NDIS: event InstanceName",
                          instance, instance_len);

        if (buf + res - pos > 1) {
                data_len = *pos++;
                if (data_len > buf + res - pos) {
                        wpa_printf(MSG_DEBUG, "NDIS: event data overflow");
                        return;
                }
                data = pos;
                wpa_hexdump(MSG_MSGDUMP, "NDIS: event data", data, data_len);
        }

        if (drv->adapter_desc) {
                desc_len = strlen(drv->adapter_desc);
                if (instance_len < desc_len ||
                    strncmp(drv->adapter_desc, instance, desc_len)) {
                        wpa_printf(MSG_DEBUG, "NDIS: ignored event for "
                                   "another adapter");
                        return;
                }

                /* InstanceName:
                 * <driver desc> #<num>
                 * <driver desc> #<num> - <intermediate drv name> Miniport
                 */
                for (i = desc_len + 1; i < instance_len; i++) {
                        if (instance[i] == '-') {
                                wpa_printf(MSG_DEBUG, "NDIS: ignored event "
                                           "for intermediate miniport");
                                return;
                        }
                }
        }

        switch (type) {
        case EVENT_CONNECT:
                wpa_driver_ndis_event_connect(drv);
                break;
        case EVENT_DISCONNECT:
                wpa_driver_ndis_event_disconnect(drv);
                break;
        case EVENT_MEDIA_SPECIFIC:
                wpa_driver_ndis_event_media_specific(drv, data, data_len);
                break;
        }
}


int wpa_driver_register_event_cb(struct wpa_driver_ndis_data *drv)
{
        struct sockaddr_in addr;

        drv->event_sock = socket(PF_INET, SOCK_DGRAM, 0);
        if (drv->event_sock < 0) {
                perror("socket");
                return -1;
        }

        /* These events are received from an external program, ndis_events,
         * which is converting WMI events to more "UNIX-like" input for
         * wpa_supplicant, i.e., UDP packets that can be received through the
         * eloop mechanism. */
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = htonl((127 << 24) | 1);
        addr.sin_port = htons(9876);
        if (bind(drv->event_sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
        {
                perror("bind");
                close(drv->event_sock);
                drv->event_sock = -1;
                return -1;
        }

        eloop_register_read_sock(drv->event_sock, wpa_driver_ndis_event_cb,
                                 drv, NULL);

        return 0;
}

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