передача данных по МАС уровню - не работает sentto() - 3

Есть код:

int	main	(int argc, char **argv, char **envp)	{

    int	sock;		// socket descriptor;
    int	i,rc;		// return code
    int	promisc = 0;	// promiscious flag
    int	lo = 0;		// localhost flag
    struct	ifreq	interface;	// interface structure

    signal(SIGINT,quit);
    signal(SIGQUIT,quit);
    signal(SIGTERM,quit);

    printf("Tiny demo sniffer v0.0 by [Privacy], 2002\n");

    if(argc<2)	{
	printf("Usage: %s <-i interface> [-p]\n\t-i\tphysical interface name or \"localhost\" for loopback\n\t-p\tuse this option to put a device into promiscious mode\n",argv[0]);
	printf("Example:\t%s -i eth0 -p\n\t\t%s -i localhost\n",argv[0],argv[0]);
	return 1;
    }

    device[0] = 0;
    for( i=1; i<argc; i++ ) {
	if( !memcmp( argv[i], "-i", 2 ) ) {
	    if( argv[++i] ) {
			 strcpy( device, argv[i] );
	    } else {
		printf("Exiting: -i parameter is omitted!\n");
		return 1;
	    }
	}
	if( !memcmp( argv[i], "-p", 2 ) )	{
	    promisc = 1;
	}
    }
    
    if( !device[0] )	{
	printf("Exiting: no device entered!\n");
	return 1;
    }

    if( !strcmp( device, "localhost" ) ) {
		lo = 1;
	 }
	 
    if( lo && promisc )	{
	printf("Cannot put loopback device into promiscious mode!\n");
	return 1;
    }	

// allocating a socket    
	sock = socket( PF_PACKET, /*SOCK_RAW*/SOCK_PACKET, htons( ETH_P_ALL ) );
	if(sock < 0) {
		printf("Exiting: failed allocating a socket!\n");
		return 1;
	}

// putting a device into non-blocking mode, if required
    if( promisc ) {
    strcpy(interface.ifr_name,device);
	if(ioctl(sock,SIOCGIFFLAGS,&interface) < 0) {
		printf("failed reading data for %s!\n",device);
		return 1;
	}

    interface.ifr_flags |= IFF_PROMISC;
    // setting promiscious flag here
	if(ioctl(sock,SIOCSIFFLAGS,&interface) < 0) {
	printf("failed setting data for %s!\n",device);
	return 1;
	}
    }

// binding a socket to device
    if(!lo)	{
    rc = setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,device,strlen(device)+1);
    if(rc == -1)	{
	printf("Exiting: failed binding socket to %s\n",device);
	return 1;
    }
    }
    
    printf("Listening on %s\n",device);

	memset( buf_send, 0, sizeof( buf_send ) );


	 buf_send[0] = 0x08;
	 buf_send[1] = 0x00;
	 buf_send[2] = 0x27;
	 buf_send[3] = 0xA3;
	 buf_send[4] = 0x12;
	 buf_send[5] = 0x55;
	 buf_send[6] = 0x08;
	 buf_send[7] = 0x00;
	 buf_send[8] = 0x27;
	 buf_send[9] = 0xA3;
	 buf_send[10] = 0x12;
	 buf_send[11] = 0x55;
	 buf_send[12] = 0x01;

    if( lo )	{
    while( !enough )	{
		rc = recvfrom( sock, buf, sizeof( buf ), 0, 0, 0 );
        if( !memcmp( buf, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 12 ) ) {
	    printf( "\npacket #%u\n", packets++ );
	    decode( buf, rc, out );
	    printf( "%s\n", out );
	    hexout( buf, rc, out );
	    printf( "%s\n", out );
	    }
        }
    }	else	{
    while( !enough ) {
	rc = sendto( sock, buf_send, sizeof( buf_send ), 0, 0, 0 );
	printf( "send=%d : %s\n", rc, strerror( errno ) );
        }
    }
    
    if( promisc ) {
    interface.ifr_flags &= ~IFF_PROMISC;
    if( ioctl( sock, SIOCSIFFLAGS, &interface ) < 0 ) {
	    printf("failed wiping IFF_PROMISC flag!\n");
	    return 1;
	}
    }

    return 0;
}    


почему sendto() не работает? пишет, что нет конечно точки для транспортировки пакетов.