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vtable_structs: Attempting to port into IDA-9.0 #6

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vtable_structs: Attempting to port into IDA-9.0 #6

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54 changes: 34 additions & 20 deletions vtable_structs.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import idc
import idautils
import idaapi
import ida_typeinf
import ctypes
import time

Expand Down Expand Up @@ -215,12 +216,12 @@ def get_class_from_ea(classtype, ea):
bytestr = idaapi.get_bytes(ea, ctypes.sizeof(classtype))
return classtype.from_buffer_copy(bytestr)

def add_struc_ex(name):
strucid = idaapi.get_struc_id(name)
if strucid == idc.BADADDR:
strucid = idaapi.add_struc(idc.BADADDR, name)
# def add_struc_ex(name):
# strucid = idc.get_struc_id(name)
# if strucid == idc.BADADDR:
# strucid = idc.add_struc(idc.BADADDR, name, 0)

return strucid
# return strucid

# Anything past Classname::
# Thank you CTFPlayer::SOCacheUnsubscribed...
Expand Down Expand Up @@ -394,27 +395,40 @@ def calc_member_tinfo(vfunc):
InfoCache.tinfos[vfunc.funcref.ea] = tinfo
return tinfo

def add_struc_new(name):
tid = idaapi.get_named_type_tid(name)
if tid != idaapi.BADADDR:
# The struct already exists.
print("Struct {!r} Already exists!".format(name))

tid = idaapi.tinfo_t.create_udt(idaapi.BADADDR, name, 0)
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@NullExir NullExir Feb 13, 2025

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runtime error


if tid == idaapi.BADADDR:
print(f"{tid} Struct creation failed.")
else:
print(f"creating struct {tid}")

return tid

def create_structs(data):
# Now this is an awesome API function that we most certainly need
idaapi.begin_type_updating(idaapi.UTP_STRUCT)

for classname, vtables in data.items():
classstrucid = add_struc_ex(classname)
classstruc = idaapi.get_struc(classstrucid)
classstrucid = add_struc_new(classname)

for thisoffs, vfuncs in vtables.items():
thisoffs = abs(thisoffs)
postfix = f"_{thisoffs:04X}" if thisoffs != 0 else ""
structype = f"{classname}{postfix}{idaapi.VTBL_SUFFIX}"
structype = idaapi.validate_name(structype, idaapi.VNT_TYPE, idaapi.SN_IDBENC)

vtablestrucid = add_struc_ex(structype)
vtablestruc = idaapi.get_struc(vtablestrucid)
vtablestrucid = add_struc_new(structype)
for i, vfunc in enumerate(vfuncs):
offs = i * ctypes.sizeof(ea_t)
targetname = vfunc.funcref.sname

currmem = idaapi.get_member(vtablestruc, offs)
currmem = idc.get_member_id(vtablestrucid, offs)
if currmem:
# memname = idaapi.get_member_name(currmem.id)
# # Can have a postfix so we use in operator
Expand Down Expand Up @@ -446,35 +460,35 @@ def create_structs(data):
opinfo.ri.base = 0
opinfo.ri.tdelta = 0

serr = idaapi.add_struc_member(vtablestruc, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))
serr = idc.add_struc_member(vtablestrucid, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))
# Failed, so there was either an invalid name or a name collision
if serr == idaapi.STRUC_ERROR_MEMBER_NAME:
targetname = idaapi.validate_name(targetname, idaapi.VNT_IDENT, idaapi.SN_IDBENC)
serr = idaapi.add_struc_member(vtablestruc, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))
serr = idc.add_struc_member(vtablestrucid, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))
if serr == idaapi.STRUC_ERROR_MEMBER_NAME:
targetname = f"{targetname}_{offs:X}"
serr = idaapi.add_struc_member(vtablestruc, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))
serr = idc.add_struc_member(vtablestrucid, targetname, offs, FF_PTR|idc.FF_0OFF, opinfo, ctypes.sizeof(ea_t))

if serr != idaapi.STRUC_ERROR_MEMBER_OK:
print(vtablestruc, vtablestrucid)
print(vtablestrucid, vtablestrucid)
print(f"Failed to add member {classname}::{vfunc.funcref.sname} ({targetname}) at offset {offs:#x} -> {serr}")
continue

tinfo = calc_member_tinfo(vfunc)
if tinfo is not None:
mem = idaapi.get_member(vtablestruc, offs)
idaapi.set_member_tinfo(vtablestruc, mem, 0, tinfo, 0)
mem = idc.get_member_id(vtablestrucid, offs)
idaapi.set_member_tinfo(vtablestrucid, mem, 0, tinfo, 0)

vmember = idaapi.get_member(classstruc, thisoffs)
vmember = idc.get_member_id(classstrucid, thisoffs)
if not vmember:
if idaapi.add_struc_member(classstruc, f"{idaapi.VTBL_MEMNAME}{postfix}", thisoffs, idc.FF_DATA | FF_PTR, None, ctypes.sizeof(ea_t)) == idaapi.STRUC_ERROR_MEMBER_OK:
if idc.add_struc_member(classstrucid, f"{idaapi.VTBL_MEMNAME}{postfix}", thisoffs, idc.FF_DATA | FF_PTR, None, ctypes.sizeof(ea_t)) == idaapi.STRUC_ERROR_MEMBER_OK:
global STRUCTS
STRUCTS += 1
tinfo = idaapi.tinfo_t()
if idaapi.guess_tinfo(tinfo, vtablestrucid) != idaapi.GUESS_FUNC_FAILED:
mem = idaapi.get_member(classstruc, thisoffs)
mem = idc.get_member_id(classstrucid, thisoffs)
tinfo.create_ptr(tinfo)
idaapi.set_member_tinfo(classstruc, mem, 0, tinfo, 0)
idaapi.set_member_tinfo(classstrucid, mem, 0, tinfo, 0)

def read_vtables_linux():
WaitBox.show("Parsing typeinfo")
Expand Down