306 lines
9.8 KiB
Python
306 lines
9.8 KiB
Python
import argparse
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import os
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import struct
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import sys
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from typing import List
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from bemani.common import PEFile
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from bemani.protocol import Node
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from bemani.utils.responsegen import generate_lines
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def parse_psmap(pe: PEFile, offset: str, rootname: str, *, verbose: bool = False) -> Node:
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root = Node.void(rootname)
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base = int(offset, 16)
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if pe.is_virtual(base):
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# Assume this is virtual
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base = pe.virtual_to_physical(base)
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def read_string(offset: int) -> str:
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# First, translate load offset in memory to disk offset
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offset = pe.virtual_to_physical(offset)
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# Now, grab bytes until we're null-terminated
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bytestring = []
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while pe.data[offset] != 0:
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bytestring.append(pe.data[offset])
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offset = offset + 1
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# Its shift-jis encoded, so decode it now
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return bytes(bytestring).decode('shift_jisx0213')
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# For recursing into nodes
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saved_root: List[Node] = []
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saved_loc: List[int] = []
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while True:
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readbase = base
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if pe.is_64bit(): # 64 bit
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chunk = pe.data[base:(base + 24)]
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base = base + 24
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(nodetype, mandatory, outoffset, width, nameptr, default) = struct.unpack('<BBHIQQ', chunk)
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else: # 32 bit
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chunk = pe.data[base:(base + 16)]
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base = base + 16
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(nodetype, mandatory, outoffset, width, nameptr, default) = struct.unpack('<BBHIII', chunk)
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if nodetype == 0xFF or nodetype == 0x00: # if nodetype is 0 then we probably read garbage
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# End of nodes, see if we should exit
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if len(saved_root) == 0:
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break
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else:
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root = saved_root.pop()
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oldbase = saved_loc.pop()
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if oldbase is not None:
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base = oldbase
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continue
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# Grab name, get rid of parse numbers
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name = read_string(nameptr)
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try:
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if name.index('#') >= 0:
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name = name[:name.index('#')]
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except ValueError:
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pass
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# Grab the default
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if default != 0:
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try:
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defaultptr = pe.virtual_to_physical(default)
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except Exception:
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defaultptr = 0
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if verbose:
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space = " " * len(saved_root)
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print(
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f"{space}Node offset: {hex(readbase)}{os.linesep}" +
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f"{space} Type: {hex(nodetype)}{os.linesep}" +
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f"{space} Mandatory: {'yes' if mandatory != 0 else 'no'}{os.linesep}" +
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f"{space} Name: {name}{os.linesep}" +
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f"{space} Parse Offset: {outoffset}{os.linesep}" +
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f"{space} Data Width: {width}{os.linesep}" +
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(
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f"{space} Data Pointer: {'null' if defaultptr == 0 else hex(defaultptr)}"
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if nodetype == 0x01 else
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f"{space} Default: {default}"
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),
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file=sys.stderr,
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)
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if nodetype == 0x01:
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# This is a void node, so we should handle by recursing
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node = Node.void(name)
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root.add_child(node)
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# Recurse here
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saved_root.append(root)
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if defaultptr != 0:
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saved_loc.append(base)
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base = defaultptr
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else:
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saved_loc.append(None)
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root = node
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continue
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elif nodetype == 0x02 or nodetype == 0x43:
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if nodetype < 0x40:
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elements = int(width / 1)
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else:
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elements = width
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if elements > 1:
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node = Node.s8_array(name, [-1] * elements)
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else:
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node = Node.s8(name, -1)
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elif nodetype == 0x03 or nodetype == 0x44:
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if nodetype < 0x40:
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elements = int(width / 1)
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else:
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elements = width
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if elements > 1:
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node = Node.u8_array(name, [0] * elements)
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else:
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node = Node.u8(name, 0)
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elif nodetype == 0x04 or nodetype == 0x45:
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if nodetype < 0x40:
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elements = int(width / 2)
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else:
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elements = width
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if elements > 1:
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node = Node.s16_array(name, [-1] * elements)
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else:
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node = Node.s16(name, -1)
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elif nodetype == 0x05 or nodetype == 0x46:
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if nodetype < 0x40:
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elements = int(width / 2)
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else:
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elements = width
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if elements > 1:
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node = Node.u16_array(name, [0] * elements)
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else:
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node = Node.u16(name, 0)
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elif nodetype == 0x06 or nodetype == 0x47:
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if nodetype < 0x40:
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elements = int(width / 4)
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else:
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elements = width
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if elements > 1:
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node = Node.s32_array(name, [-1] * elements)
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else:
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node = Node.s32(name, -1)
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elif nodetype == 0x07 or nodetype == 0x48:
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if nodetype < 0x40:
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elements = int(width / 4)
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else:
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elements = width
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if elements > 1:
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node = Node.u32_array(name, [0] * elements)
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else:
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node = Node.u32(name, 0)
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elif nodetype == 0x08 or nodetype == 0x49:
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if nodetype < 0x40:
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elements = int(width / 8)
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else:
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elements = width
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if elements > 1:
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node = Node.s64_array(name, [-1] * elements)
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else:
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node = Node.s64(name, -1)
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elif nodetype == 0x09 or nodetype == 0x4A:
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if nodetype < 0x40:
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elements = int(width / 8)
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else:
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elements = width
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if elements > 1:
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node = Node.u64_array(name, [0] * elements)
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else:
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node = Node.u64(name, 0)
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elif nodetype == 0x0A:
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node = Node.string(name, '')
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elif nodetype == 0x0D:
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node = Node.float(name, 0.0)
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elif nodetype == 0x32 or nodetype == 0x6D:
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if nodetype < 0x40:
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elements = int(width / 1)
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else:
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elements = width
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if elements > 1:
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node = Node.bool_array(name, [False] * elements)
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else:
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node = Node.bool(name, False)
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elif nodetype == 0x2F:
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# Special case, this is an attribute
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if name[-1] != '@':
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raise Exception(f'Attribute name {name} expected to end with @')
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root.set_attribute(name[:-1], '')
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continue
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else:
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raise Exception(f'Unimplemented node type 0x{nodetype:02x}')
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# Append it
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root.add_child(node)
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return root
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def main() -> None:
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parser = argparse.ArgumentParser(description="A utility to extract psmap node lists and generate code.")
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parser.add_argument(
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"--file",
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help="DLL file to extract from.",
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type=str,
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default=None,
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required=True,
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)
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parser.add_argument(
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"--offset",
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help="Hex offset into the file. This can be specified as either a raw offset into the DLL or as a virtual offset.",
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type=str,
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default=None,
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required=True,
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)
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parser.add_argument(
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"-o",
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"--outfile",
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help="File to write python code to. Use - for stdout.",
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type=str,
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default=None,
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required=True,
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)
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parser.add_argument(
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"--root",
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help="Root node name to be used for the generated code.",
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type=str,
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default="root",
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)
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parser.add_argument(
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"--emulate-code",
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help=(
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"Hex offset pair of addresses where we should emulate x86/x64 code to "
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"reconstuct a dynamic psmap structure, separated by a colon. This can "
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"be specified as either a raw offset into the DLL or as a virtual offset. "
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"If multiple sections must be emulated you can specify this multiple times."
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),
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type=str,
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action='append',
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default=[],
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)
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parser.add_argument(
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"--emulate-function",
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help=(
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"Hex offset address of a function that we should emulate to reconstruct a "
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"dynamic psmap structure. This can be specified as either a raw offset into "
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"the DLL or as a virtual offset. If multiple functions must be emulated you "
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"can specify this multiple times."
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),
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type=str,
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action='append',
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default=[],
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)
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parser.add_argument(
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"--verbose",
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"-v",
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help="Display verbose parsing info.",
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action="store_true",
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default=False,
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)
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args = parser.parse_args()
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fp = open(args.file, 'rb')
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data = fp.read()
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fp.close()
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pe = PEFile(data=data)
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# If asked, attempt to emulate code which dynamically constructs a psmap structure.
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if args.emulate_code:
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for chunk in args.emulate_code:
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emulate_start, emulate_end = chunk.split(':', 1)
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start = int(emulate_start, 16)
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end = int(emulate_end, 16)
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pe.emulate_code(start, end, verbose=args.verbose)
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if args.emulate_function:
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for function_address in args.emulate_function:
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fun = int(function_address, 16)
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pe.emulate_function(fun, verbose=args.verbose)
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layout = parse_psmap(pe, args.offset, args.root, verbose=args.verbose)
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# Walk through, outputting each node and attaching it to its parent
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code = '\n'.join(generate_lines(layout, {}))
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if args.outfile == '-':
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print(code)
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else:
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with open(args.outfile, mode="a") as outfp:
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outfp.write(code)
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outfp.close
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if __name__ == '__main__':
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main()
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