#!~/.wine/drive_c/Python25/python.exe

# Copyright (c) 2009-2010, Mario Vilas
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# 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.
#     * Redistributions in binary form must reproduce the above copyright
#       notice,this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the copyright holder nor the names of its
#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

    # Note:
    # This simple approach seems fast enough. But if there's ever a need to
    # optimize this for 32 bits Windows this is how it could be done: since
    # the system allocation granularity is 64k, it should be possible to
    # precalculate the lower 16 bits of all possible alphanumeric addresses,
    # then only test the higher 16 bits of the address for each memory region.

# $Id: find_alnum.py 670 2010-04-30 13:53:43Z qvasimodo $

from struct import pack
from winappdbg import System, Process, HexDump

# Iterator of alphanumeric executable addresses
def iterate_alnum_jump_addresses(memory_snapshot):

    # Determine the size of a pointer in the current architecture
    if System.bits == 32:
        fmt = 'L'
    elif System.bits == 64:
        fmt = 'Q'
    else:
        raise NotImplementedError

    # Iterate the memory regions of the target process
    for mbi in memory_snapshot:

        # Discard non executable memory
        if not mbi.is_executable():
            continue

        # Yield each alphanumeric address in this memory region.
        address     = mbi.BaseAddress
        max_address = address + mbi.RegionSize
        while address < max_address:
            packed = pack(fmt, address)
            if packed.isalnum():
                yield address, packed
            address = address + 1

# Iterate and print alphanumeric executable addresses.
def print_alnum_jump_addresses(pid):

    # Request debug privileges so we can inspect the memory of services too.
    System.request_debug_privileges()

    # Suspend the process so there are no malloc's and free's while iterating.
    process = Process(pid)
    process.suspend()
    try:

        # Get an iterator for the target process memory.
        iterator = process.generate_memory_snapshot()

        # Print each executable alphanumeric address.
        for address, packed in iterate_alnum_jump_addresses(iterator):
            print HexDump.address(address), repr(packed)

    # Resume the process when we're done.
    # This is inside a "finally" block, so if the program is interrupted
    # for any reason we don't leave the process suspended.
    finally:
        process.resume()

# When invoked from the command line,
# the first argument is the process ID.
if __name__ == '__main__':
    from sys import argv
    pid = int(argv[1])
    try:
        print_alnum_jump_addresses(pid)
    except KeyboardInterrupt:
        print "Interrupted by the user."
    except Exception:
        import traceback
        traceback.print_exc()