mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
mike.auty@gmail.com
63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
# Volatility
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#
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# Authors:
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# Adam Boileau <metlstorm@storm.net.nz>
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# Mike Auty <mike.auty@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# *Heavily* based upon http://www.storm.net.nz/static/files/bioskbsnarf
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import struct
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import volatility.commands as commands
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import volatility.utils as utils
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import volatility.debug as debug
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class BiosKbd(commands.Command):
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"""Reads the keyboard buffer from Real Mode memory"""
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BASE = 0x400
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OFFSET = 0x17
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BUFOFFSET = 0x1e
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LEN = 39
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FORMAT = "<BBBHH32s"
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def render_text(self, outfd, data):
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"""Displays the character codes"""
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outfd.write("Ascii Scancode\n")
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for c, s in data:
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outfd.write("{0} (0x{1:02x}) 0x{2:02x}\n".format(self.format_char(c), ord(c), s))
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def format_char(self, c):
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"""Prints out an ascii printable character"""
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if c in '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ[]{};\'#:@~,./<>?!"$%^&*()_+-=`\\|':
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return c
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return "."
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def calculate(self):
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"""Calculate returns the results of the bios keyboard reading"""
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addr_space = utils.load_as(self._config, astype = 'physical')
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data = addr_space.read(self.BASE + self.OFFSET, self.LEN)
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if not data or len(data) != self.LEN:
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debug.error("Failed to read keyboard buffer, please check this is a physical memory image.")
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_shifta, _shiftb, _alt, readp, _writep, buf = struct.unpack(self.FORMAT, data)
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unringed = buf[readp - self.BUFOFFSET:]
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unringed += buf[:readp - self.BUFOFFSET]
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results = []
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for i in range(0, len(unringed) - 2, 2):
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if ord(unringed[i]) != 0:
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results.append((unringed[i], ord(unringed[i + 1])))
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return results
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