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DelphiClass_MethodTable.py
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274 lines (221 loc) · 9.65 KB
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#
# This module allows to parse Delphi's MethodTable
#
# Copyright (c) 2020-2026 ESET
# Author: Juraj Horňák <juraj.hornak@eset.com>
# See LICENSE file for redistribution.
import ida_bytes
import ida_name
import idc
from DelphiHelper.core.DelphiClass_TypeInfo import *
from DelphiHelper.util.delphi import GetParamRegister
from DelphiHelper.util.ida import *
class MethodTable(object):
def __init__(
self,
delphiVersion: int,
classInfo: dict[str, str | dict[str, int]]) -> None:
self.__tableAddr = classInfo["Address"]["MethodTable"]
self.__tableName = classInfo["Name"]
self.__classInfo = classInfo
self.__processorWordSize = GetProcessorWordSize()
self.__delphiVersion = delphiVersion
def GetTableAddress(self) -> int:
return self.__tableAddr
def MakeTable(self) -> None:
if self.__tableAddr != 0:
self.__DeleteTable()
self.__CreateTable()
def GetMethods(self) -> list[tuple[str, int]]:
methodList = list()
if self.__tableAddr != 0:
numOfEntries = Word(self.__tableAddr)
addr = self.__tableAddr + 2
for i in range(numOfEntries):
methodAddr = GetCustomWord(addr + 2, self.__processorWordSize)
methodName = GetStr_PASCAL(addr + 2 + self.__processorWordSize)
addr += Word(addr)
methodList.append((methodName, methodAddr))
return methodList
def __CreateTable(self) -> None:
MakeWord(self.__tableAddr)
MakeName(self.__tableAddr, self.__tableName + "_MethodTable")
ida_bytes.set_cmt(
self.__tableAddr,
"Number of records",
0
)
numOfEntries = Word(self.__tableAddr)
if numOfEntries != 0:
ida_bytes.set_cmt(
self.__tableAddr + 2,
"Record size",
0
)
ida_bytes.set_cmt(
self.__tableAddr + 4,
"Method pointer",
0
)
ida_bytes.set_cmt(
self.__tableAddr + 4 + self.__processorWordSize,
"Method Name",
0
)
addr = self.__tableAddr + 2
for i in range(numOfEntries):
recordSize = Word(addr)
MakeWord(addr)
funcAddr = GetCustomWord(addr + 2, self.__processorWordSize)
MakeFunction(funcAddr)
MakeCustomWord(addr + 2, self.__processorWordSize)
MakeStr_PASCAL(addr + 2 + self.__processorWordSize)
name = (self.__tableName
+ "_"
+ GetStr_PASCAL(addr + 2 + self.__processorWordSize))
MakeName(funcAddr, name)
if idc.get_struc_id(self.__tableName + "_Self") != ida_idaapi.BADADDR:
funcPrototype = ("void __usercall "
+ name
+ "("
+ self.__tableName
+ "_Self* "
+ self.__tableName
+ "_Self"
+ GetParamRegister(0)
+ ");")
idc.SetType(funcAddr, funcPrototype)
addr = addr + recordSize
dynamicTableAddr = self.__classInfo["Address"]["DynamicTable"]
classNameAddr = self.__classInfo["Address"]["ClassName"]
if (dynamicTableAddr == 0 and addr < classNameAddr) or \
(dynamicTableAddr != 0 and addr < dynamicTableAddr):
numOfEntries = Word(addr)
MakeWord(addr)
addr += 2
for i in range(numOfEntries):
MakeCustomWord(addr, self.__processorWordSize)
MakeByte(addr + self.__processorWordSize)
idc.make_array(addr + self.__processorWordSize, 4)
recordAddr = GetCustomWord(addr, self.__processorWordSize)
self.__CreateFunctionRecord(recordAddr)
addr += 4 + self.__processorWordSize
def __CreateFunctionRecord(self, addr: int) -> None:
recordSize = Word(addr)
funcNameAddr = addr + 2
MakeWord(addr)
nameAddr = GetCustomWord(funcNameAddr, self.__processorWordSize)
name = ida_name.get_name(nameAddr)
if self.__tableName not in name:
MakeFunction(GetCustomWord(funcNameAddr, self.__processorWordSize))
MakeCustomWord(funcNameAddr, self.__processorWordSize)
MakeStr_PASCAL(funcNameAddr + self.__processorWordSize)
funcBaseName = GetStr_PASCAL(funcNameAddr + self.__processorWordSize)
MakeName(addr, "_" + self.__tableName + "_" + funcBaseName)
funcPrototype = ("void __usercall "
+ self.__tableName
+ "_"
+ funcBaseName
+ "(")
size = (3 + self.__processorWordSize
+ Byte(funcNameAddr + self.__processorWordSize))
if recordSize > size:
addr += size
MakeCustomWord(addr, self.__processorWordSize)
addr += self.__processorWordSize
MakeDword(addr)
addr += 4
MakeByte(addr)
numOfParams = Byte(addr)
addr += 1
if funcBaseName == "Create":
numOfParams += 1
for i in range(numOfParams):
regStr = GetParamRegister(i)
if i == 1 and funcBaseName == "Create":
funcPrototype += "void* ShortInt_Alloc" + regStr
else:
MakeByte(addr)
MakeCustomWord(addr + 1, self.__processorWordSize)
MakeWord(addr + 1 + self.__processorWordSize)
MakeStr_PASCAL(addr + 3 + self.__processorWordSize)
wordAddr = (addr + 4
+ self.__processorWordSize
+ Byte(addr + 3 + self.__processorWordSize))
MakeWord(wordAddr)
argTypeInfo = GetCustomWord(
addr + 1,
self.__processorWordSize
)
if argTypeInfo == 0:
typeName = "NoType"
elif ida_bytes.is_mapped(argTypeInfo) and ida_bytes.is_loaded(argTypeInfo):
typeInfoAddr = argTypeInfo + self.__processorWordSize
typeInfo = TypeInfo(
self.__delphiVersion,
typeInfoAddr
)
typeInfo.MakeTable(1)
typeName = typeInfo.GetTypeName()
else:
return
paramNameAddr = addr + 3 + self.__processorWordSize
paramName = GetStr_PASCAL(paramNameAddr)
if paramName is None:
paramName = "RetVal"
if paramName == "Self" or \
idc.get_struc_id(typeName + "_Self") != ida_idaapi.BADADDR:
funcPrototype += (typeName
+ "_Self* "
+ typeName
+ "_"
+ paramName
+ regStr)
else:
funcPrototype += ("void* "
+ typeName
+ "_"
+ paramName
+ regStr)
addr = (addr + 6
+ self.__processorWordSize
+ Byte(addr + 3 + self.__processorWordSize))
if i != numOfParams - 1:
funcPrototype += ", "
MakeWord(addr)
funcPrototype += ");"
nameAddr = GetCustomWord(funcNameAddr, self.__processorWordSize)
name = ida_name.get_name(nameAddr)
if Byte(nameAddr) == 0:
MakeName(nameAddr, "sub_nullsub")
else:
if self.__tableName not in name:
MakeName(nameAddr, self.__tableName + "_" + funcBaseName)
idc.SetType(nameAddr, funcPrototype)
def __DeleteTable(self) -> None:
ida_bytes.del_items(self.__tableAddr, ida_bytes.DELIT_DELNAMES, 2)
addr = self.__tableAddr + 2
numOfEntries = Word(self.__tableAddr)
for i in range(numOfEntries):
recordSize = Word(addr)
ida_bytes.del_items(addr, ida_bytes.DELIT_DELNAMES, recordSize)
addr = addr + recordSize
dynamicTableAddr = self.__classInfo["Address"]["DynamicTable"]
classNameAddr = self.__classInfo["Address"]["ClassName"]
if (dynamicTableAddr == 0 and addr < classNameAddr) or \
(dynamicTableAddr != 0 and addr < dynamicTableAddr):
numOfEntries = Word(addr)
ida_bytes.del_items(addr, ida_bytes.DELIT_DELNAMES, 2)
addr += 2
for i in range(numOfEntries):
ida_bytes.del_items(
addr,
ida_bytes.DELIT_DELNAMES,
4 + self.__processorWordSize
)
ida_bytes.del_items(
GetCustomWord(addr, self.__processorWordSize),
ida_bytes.DELIT_DELNAMES,
Word(GetCustomWord(addr, self.__processorWordSize))
)
addr += 4 + self.__processorWordSize