//-------------------------------------------------------------------
//	trywatch.cpp
//
//	This application is provided for testing the ability of our
//	'watch235.c' pseudo device-driver to intercept packets that
//	are received by the RTL8139 network adapter integrated into
//	each student workstation in our Harney-235 classroom.  
//
//	programmer: ALLAN CRUSE
//	written on: 06 DEC 2004
//-------------------------------------------------------------------

#include <stdio.h>	// for printf(), perror() 
#include <fcntl.h>	// for open() 
#include <stdlib.h>	// for exit() 
#include <unistd.h>	// for read(), write(), close() 

char filename[] = "/proc/watch235";

int main( int argc, char **argv )
{
	// install the driver-module and open the pseudo-file
	system( "/sbin/insmod watch235.o" );
	int	fd = open( filename, O_RDONLY );
	if ( fd < 0 ) { perror( filename ); exit(1); }
	
	// read a received network-packet from the pseudo-file
	unsigned char	buffer[ 1536 ];
	int	nbytes = read( fd, buffer, sizeof( buffer ) );
	printf( "\nread %d bytes from \'%s\' \n", nbytes, filename );

	// display the packet in hexadecimal and ascii formats
	for (int i = 0; i < nbytes; i += 16)
		{
		printf( "\n%03X: ", i );
		for (int j = 0; j < 16; j++)
			{
			if ( i+j < nbytes ) printf( "%02X ", buffer[ i+j ] );
			else	printf( "   " );
			}
		for (int j = 0; j < 16; j++)
			{
			unsigned char	ch = ' ';
			if ( i+j < nbytes ) ch = buffer[ i+j ];
			if (( ch < 0x20 )||( ch > 0x7E )) ch = '.';
			printf( "%c", ch );
			}
		}
	printf( "\n\n" );	

	// close the file and remove the driver-module	
	close( fd );
	system( "/sbin/rmmod watch235" );
}