# Copyright (c) 2009, Mario Vilas
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
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#       this software without specific prior written permission.
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# $Id: example6.py 160 2009-05-16 01:46:37Z qvasimodo $

# Example #6
# http://apps.sourceforge.net/trac/winappdbg/wiki/wiki/Debugging#Example6:tracingexecution

from winappdbg import Debug, EventHandler, CrashDump, win32


class MyEventHandler( EventHandler ):

    # This private method enables the tracing mode
    def __trace( self, event ):

        # Enable the step on branch mode (optional)
        # event.debug.system.enable_step_on_branch_mode()

        # Set the trap flag
        event.get_thread().set_tf()


    # Create process events go here
    def create_process( self, event ):

        # Start tracing the main thread
        self.__trace( event )


    # Create thread events go here
    def create_thread( self, event ):

        # Start tracing the new thread
        self.__trace( event )


    # Single step events go here
    def single_step( self, event ):

        # The debugee mustn't see this exception
        event.continueStatus = win32.DBG_CONTINUE

        # Continue tracing
        self.__trace( event )

        # Show the user where we're running
        thread = event.get_thread()
        pc     = thread.get_pc()
        code   = thread.disassemble( pc, 0x10 ) [0]
        print "0x%.08x: %s" % ( code[0], code[2].lower() )


def simple_debugger( argv ):

    # Instance a Debug object, passing it the MyEventHandler instance
    debug = Debug( MyEventHandler() )
    try:

        # Start a new process for debugging
        debug.execv( argv )

        # Wait for the debugee to finish
        debug.loop()

    # Stop the debugger
    finally:
        debug.stop()

# When invoked from the command line,
# the first argument is an executable file,
# and the remaining arguments are passed to the newly created process
if __name__ == "__main__":
    import sys
    simple_debugger( sys.argv[1:] )
