def abi(self):
"""Return the IDA guessed ABI
"""
architecture = self.architecture
available_abis = self.IDAABI2SibylABI.get(architecture, None)
if not available_abis:
raise ValueError("No ABI available for architecture %s" %
architecture)
if isinstance(available_abis, str):
return available_abis
# Search for IDA guessed type
for func_addr in idautils.Functions():
gtype = idc.GuessType(func_addr)
if gtype is None:
continue
match = self.gtype_matcher.match(gtype)
if match is None:
continue
calling_conv = match.group(1)
abi = available_abis.get(calling_conv, None)
if abi is None:
raise ValueError("No ABI matching %s" % calling_conv)
return abi
raise ValueError("Unable to guess ABI")
def get_type(cls, function):
'''Get function type.'''
ctype = idc.GetType(function)
if not ctype:
ctype = idc.GuessType(function)
if not ctype:
ctype = ''
return ctype
def readEA(self, ea):
self.name = idc.GetFunctionName(ea)
if not self.name:
raise self.NotFunctionError(ea)
self.ea = ea
tp = idc.GetType(ea) or idc.GuessType(ea)
if tp:
self.parseType(tp, skipName=True)
return self
def include(self):
t = idc.GetType(self.offset)
# if failed getting type, there's no annotation here
if t is None:
return False
# if type equals guessed type, no need to save annotation
if t == idc.GuessType(self.offset):
return False
return True
def make_strings_const():
s = idautils.Strings(False)
s.setup(strtypes=idautils.Strings.STR_UNICODE | idautils.Strings.STR_C)
for v in s:
gt = idc.GetType(v.ea)
if not gt:
gt = idc.GuessType(v.ea)
if gt and not gt.startswith("const "):
idc.SetType(v.ea, "const " + gt)
def get_func_type(startEA):
"""
Parse IDA's guessed type decl
returns: tuple of: (return type, [arg types])
(this is a giant hack)
"""
type_str = idc.GuessType(startEA)
if not type_str:
# Probably wasn't a function
print("ERROR: No function type guess")
return None
# Parse strings like this:
# 'int __cdecl(int argc, const char **argv, const char **envp)'
# 'int __cdecl(int)'
# Try to make it into a parsable string
type_str = re.sub(r"(__cdecl|__fastcall|[0-9_])", '', type_str)
try:
parser = pycparser.c_parser.CParser()
res = parser.parse(type_str + ';') # Need that semicolon of course
type_ast = res.ext[0].type
# Return type
return_type = type_ast.type.type.names[0]
# Arguments
arg_types = []
if type_ast.args:
for param in type_ast.args.params:
if type(param.type) is pycparser.c_ast.PtrDecl:
# Pointer, return "ptr" for now
arg_types.append("ptr")
else:
arg_types.append(param.type.type.names[0])
return (return_type, arg_types)
except:
print("ERROR: Couldn't parse function type guess")
return None
def _propagate_virtual_method_type_for_method(classinfo, class_vindex, vmethod):
"""Propagate the type of a class's virtual method to the vtable struct."""
if not idau.is_function_start(vmethod):
_log(2, 'Not a function start: {:x}', vmethod)
return False
vmethod_type = idc.GuessType(vmethod)
if not vmethod_type:
_log(2, 'No guessed type: {:x}', vmethod)
return False
vmethod_ptr_type = symbol.convert_function_type_to_function_pointer_type(vmethod_type)
if not vmethod_ptr_type:
_log(2, 'Could not convert to function pointer type: {:x}', vmethod)
return False
vmethods_sid = idau.struct_open(classinfo.classname + '::vmethods')
vmethod_offset = class_vindex * idau.WORD_SIZE
vmethod_mid = idc.GetMemberId(vmethods_sid, vmethod_offset)
if not bool(idc.SetType(vmethod_mid, vmethod_ptr_type)):
_log(2, 'Could not set vmethod field type: {:x}, {}, {}', vmethod, classinfo.classname,
class_vindex)
return False
return True
def get_function_data(offset):
"""
Obtain a idaapi.func_type_data_t object for the function with the provided start EA.
:param int offset: start EA of function
:return: idaapi.func_type_data_t object
:raise RuntimeError: if func_type_data_t object cannot be obtained
"""
tif = idaapi.tinfo_t()
# First see if a type is already set.
if idc.GetType(offset):
idaapi.get_tinfo2(offset, tif)
else:
# Otherwise, try to use the Hexrays decompiler to determine function signature.
# (It's better than IDA's GuessType)
try:
# This requires Hexrays decompiler, load it and make sure it's available before continuing.
if not idaapi.init_hexrays_plugin():
idc.RunPlugin("hexrays", 0) or idc.RunPlugin("hexx64", 0)
if not idaapi.init_hexrays_plugin():
raise RuntimeError('Unable to load Hexrays decompiler.')
# Pull type from decompiled C code.
decompiled = idaapi.decompile(offset)
if decompiled is None:
raise RuntimeError(
"Cannot decompile function at 0x{:X}".format(offset))
decompiled.get_func_type(tif)
# Save type for next time.
format = decompiled.print_dcl2()
# The 2's remove the unknown bytes always found at the start and end.
idc.SetType(offset, "{};".format(format[2:-2]))
# If we fail, resort to using GuessType+
except RuntimeError:
# Documentation states the type must be ';' terminated, also the function name must be inserted
guessed_type = idc.GuessType(offset)
if guessed_type is None:
raise RuntimeError(
"failed to guess function type for offset 0x{:X}".format(
offset))
func_name = idc.GetFunctionName(offset)
if func_name is None:
raise RuntimeError(
"failed to get function name for offset 0x{:X}".format(
offset))
guessed_type = re.sub("\(", " {}(".format(func_name),
"{};".format(guessed_type))
idc.SetType(offset, guessed_type)
# Try one more time to get the tinfo_t object
if not idaapi.get_tinfo2(offset, tif):
raise RuntimeError(
"failed to obtain tinfo_t object for offset 0x{:X}".format(
offset))
funcdata = idaapi.func_type_data_t()
if not tif.get_func_details(funcdata):
raise RuntimeError(
"failed to obtain func_type_data_t object for offset 0x{:X}".
format(offset))
return funcdata
