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cemu-idapython/python/idautils.py
elias.bachaalany 15a72289f7 fixed issue 54
2010-08-02 14:13:48 +00:00

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#---------------------------------------------------------------------
# IDAPython - Python plugin for Interactive Disassembler Pro
#
# Copyright (c) 2004-2010 Gergely Erdelyi <gergely.erdelyi@d-dome.net>
#
# All rights reserved.
#
# For detailed copyright information see the file COPYING in
# the root of the distribution archive.
#---------------------------------------------------------------------
"""
idautils.py - High level utility functions for IDA
"""
import idaapi
import idc
import types
import os
def refs(ea, funcfirst, funcnext):
"""
Generic reference collector - INTERNAL USE ONLY.
"""
ref = funcfirst(ea)
while ref != idaapi.BADADDR:
yield ref
ref = funcnext(ea, ref)
def CodeRefsTo(ea, flow):
"""
Get a list of code references to 'ea'
@param ea: Target address
@param flow: Follow normal code flow or not
@type flow: Boolean (0/1, False/True)
@return: list of references (may be empty list)
Example::
for ref in CodeRefsTo(ScreenEA(), 1):
print ref
"""
if flow == 1:
return refs(ea, idaapi.get_first_cref_to, idaapi.get_next_cref_to)
else:
return refs(ea, idaapi.get_first_fcref_to, idaapi.get_next_fcref_to)
def CodeRefsFrom(ea, flow):
"""
Get a list of code references from 'ea'
@param ea: Target address
@param flow: Follow normal code flow or not
@type flow: Boolean (0/1, False/True)
@return: list of references (may be empty list)
Example::
for ref in CodeRefsFrom(ScreenEA(), 1):
print ref
"""
if flow == 1:
return refs(ea, idaapi.get_first_cref_from, idaapi.get_next_cref_from)
else:
return refs(ea, idaapi.get_first_fcref_from, idaapi.get_next_fcref_from)
def DataRefsTo(ea):
"""
Get a list of data references to 'ea'
@param ea: Target address
@return: list of references (may be empty list)
Example::
for ref in DataRefsTo(ScreenEA(), 1):
print ref
"""
return refs(ea, idaapi.get_first_dref_to, idaapi.get_next_dref_to)
def DataRefsFrom(ea):
"""
Get a list of data references from 'ea'
@param ea: Target address
@return: list of references (may be empty list)
Example::
for ref in DataRefsFrom(ScreenEA(), 1):
print ref
"""
return refs(ea, idaapi.get_first_dref_from, idaapi.get_next_dref_from)
def XrefTypeName(typecode):
"""
Convert cross-reference type codes to readable names
@param typecode: cross-reference type code
"""
ref_types = {
0 : 'Data_Unknown',
1 : 'Data_Offset',
2 : 'Data_Write',
3 : 'Data_Read',
4 : 'Data_Text',
5 : 'Data_Informational',
16 : 'Code_Far_Call',
17 : 'Code_Near_Call',
18 : 'Code_Far_Jump',
19 : 'Code_Near_Jump',
20 : 'Code_User',
21 : 'Ordinary_Flow'
}
assert typecode in ref_types, "unknown reference type %d" % typecode
return ref_types[typecode]
def _copy_xref(xref):
""" Make a private copy of the xref class to preserve its contents """
class _xref(object):
pass
xr = _xref()
for attr in [ 'frm', 'to', 'iscode', 'type', 'user' ]:
setattr(xr, attr, getattr(xref, attr))
return xr
def XrefsFrom(ea, flags=0):
"""
Return all references from address 'ea'
@param ea: Reference address
@param flags: any of idaapi.XREF_* flags
Example::
for xref in XrefsFrom(here(), 0):
print xref.type, XrefTypeName(xref.type), \
'from', hex(xref.frm), 'to', hex(xref.to)
"""
xref = idaapi.xrefblk_t()
if xref.first_from(ea, flags):
yield _copy_xref(xref)
while xref.next_from():
yield _copy_xref(xref)
def XrefsTo(ea, flags=0):
"""
Return all references to address 'ea'
@param ea: Reference address
@param flags: any of idaapi.XREF_* flags
Example::
for xref in XrefsTo(here(), 0):
print xref.type, XrefTypeName(xref.type), \
'from', hex(xref.frm), 'to', hex(xref.to)
"""
xref = idaapi.xrefblk_t()
if xref.first_to(ea, flags):
yield _copy_xref(xref)
while xref.next_to():
yield _copy_xref(xref)
def Threads():
"""Returns all thread IDs"""
for i in xrange(0, idc.GetThreadQty()):
yield idc.GetThreadId(i)
def Heads(start=None, end=None):
"""
Get a list of heads (instructions or data)
@param start: start address (default: inf.minEA)
@param end: end address (default: inf.maxEA)
@return: list of heads between start and end
"""
if not start: start = idaapi.cvar.inf.minEA
if not end: end = idaapi.cvar.inf.maxEA
ea = start
if not idc.isHead(idc.GetFlags(ea)):
ea = idaapi.next_head(ea, end)
while ea != idaapi.BADADDR:
yield ea
ea = idaapi.next_head(ea, end)
def Functions(start=None, end=None):
"""
Get a list of functions
@param start: start address (default: inf.minEA)
@param end: end address (default: inf.maxEA)
@return: list of heads between start and end
@note: The last function that starts before 'end' is included even
if it extends beyond 'end'. Any function that has its chunks scattered
in multiple segments will be reported multiple times, once in each segment
as they are listed.
"""
if not start: start = idaapi.cvar.inf.minEA
if not end: end = idaapi.cvar.inf.maxEA
func = idaapi.get_func(start)
if not func:
func = idaapi.get_next_func(start)
while func and func.startEA < end:
startea = func.startEA
yield startea
func = idaapi.get_next_func(startea)
def Chunks(start):
"""
Get a list of function chunks
@param start: address of the function
@return: list of funcion chunks (tuples of the form (start_ea, end_ea))
belonging to the function
"""
func_iter = idaapi.func_tail_iterator_t( idaapi.get_func( start ) )
status = func_iter.main()
while status:
chunk = func_iter.chunk()
yield (chunk.startEA, chunk.endEA)
status = func_iter.next()
def Modules():
"""
Returns a list of module objects with name,size,base and the rebase_to attributes
"""
mod = idaapi.module_info_t()
result = idaapi.get_first_module(mod)
while result:
yield idaapi.object_t(name=mod.name, size=mod.size, base=mod.base, rebase_to=mod.rebase_to)
result = idaapi.get_next_module(mod)
def Names():
"""
Returns a list of names
@return: tuple(ea, name)
"""
for i in xrange(idaapi.get_nlist_size()):
ea = idaapi.get_nlist_ea(i)
name = idaapi.get_nlist_name(i)
yield (ea, name)
def Segments():
"""
Get list of segments (sections) in the binary image
@return: List of segment start addresses.
"""
for n in xrange(idaapi.get_segm_qty()):
seg = idaapi.getnseg(n)
if seg:
yield seg.startEA
def FuncItems(start):
"""
Get a list of function items
@param start: address of the function
@return: ea of each item in the function
"""
func = idaapi.get_func(start)
if not func:
return
fii = idaapi.func_item_iterator_t()
ok = fii.set(func)
while ok:
yield fii.current()
ok = fii.next_code()
def DecodeInstruction(ea):
"""
Decodes an instruction and returns an insn_t like class
@param ea: address to decode
@return: None or a new insn_t instance
"""
inslen = idaapi.decode_insn(ea)
if inslen == 0:
return None
return idaapi.cmd.copy()
def GetDataList(ea, count, itemsize=1):
"""
Get data list - INTERNAL USE ONLY
"""
if itemsize == 1:
getdata = idaapi.get_byte
elif itemsize == 2:
getdata = idaapi.get_word
elif itemsize == 4:
getdata = idaapi.get_long
elif itemsize == 8:
getdata = idaapi.get_qword
else:
raise ValueError, "Invalid data size! Must be 1, 2, 4 or 8"
endea = ea + itemsize * count
curea = ea
while curea < endea:
yield getdata(curea)
curea += itemsize
def PutDataList(ea, datalist, itemsize=1):
"""
Put data list - INTERNAL USE ONLY
"""
putdata = None
if itemsize == 1:
putdata = idaapi.patch_byte
if itemsize == 2:
putdata = idaapi.patch_word
if itemsize == 4:
putdata = idaapi.patch_long
assert putdata, "Invalid data size! Must be 1, 2 or 4"
for val in datalist:
putdata(ea, val)
ea = ea + itemsize
def MapDataList(ea, length, func, wordsize=1):
"""
Map through a list of data words in the database
@param ea: start address
@param length: number of words to map
@param func: mapping function
@param wordsize: size of words to map [default: 1 byte]
@return: None
"""
PutDataList(ea, map(func, GetDataList(ea, length, wordsize)), wordsize)
def GetInputFileMD5():
"""
Return the MD5 hash of the input binary file
@return: MD5 string or None on error
"""
return idc.GetInputMD5()
class Strings(object):
"""
Returns the string list.
Example:
s = Strings()
for i in s:
print "%x: len=%d type=%d -> '%s'" % (i.ea, i.length, i.type, str(i))
"""
class StringItem(object):
"""
Class representing each string item.
"""
def __init__(self, si):
self.ea = si.ea
"""String ea"""
self.type = si.type
"""string type (ASCSTR_xxxxx)"""
self.length = si.length
"""string length"""
def __str__(self):
return idc.GetString(self.ea, self.length, self.type)
STR_C = 0x0001
"""C-style ASCII string"""
STR_PASCAL = 0x0002
"""Pascal-style ASCII string (length byte)"""
STR_LEN2 = 0x0004
"""Pascal-style, length is 2 bytes"""
STR_UNICODE = 0x0008
"""Unicode string"""
STR_LEN4 = 0x0010
"""Pascal-style, length is 4 bytes"""
STR_ULEN2 = 0x0020
"""Pascal-style Unicode, length is 2 bytes"""
STR_ULEN4 = 0x0040
"""Pascal-style Unicode, length is 4 bytes"""
def clear_cache(self):
"""Clears the strings list cache"""
self.refresh(0, 0) # when ea1=ea2 the kernel will clear the cache
def __init__(self, default_setup = True):
"""
Initializes the Strings enumeration helper class
@param default_setup: Set to True to use default setup (C strings, min len 5, ...)
"""
self.size = 0
if default_setup:
self.setup()
self._si = idaapi.string_info_t()
def refresh(self, ea1=None, ea2=None):
"""Refreshes the strings list"""
if ea1 is None:
ea1 = idaapi.cvar.inf.minEA
if ea2 is None:
ea2 = idaapi.cvar.inf.maxEA
idaapi.refresh_strlist(ea1, ea2)
self.size = idaapi.get_strlist_qty()
def setup(self,
strtypes = STR_C,
minlen = 5,
only_7bit = True,
ignore_instructions = False,
ea1 = None,
ea2 = None,
display_only_existing_strings = False):
if ea1 is None:
ea1 = idaapi.cvar.inf.minEA
if ea2 is None:
ea2 = idaapi.cvar.inf.maxEA
t = idaapi.strwinsetup_t()
t.strtypes = strtypes
t.minlen = minlen
t.only_7bit = only_7bit
t.ea1 = ea1
t.ea2 = ea2
t.display_only_existing_strings = display_only_existing_strings
idaapi.set_strlist_options(t)
# Automatically refreshes
self.refresh()
def __getitem__(self, index):
"""Returns a string item or None"""
if index >= self.size:
raise StopIteration
if idaapi.get_strlist_item(index, self._si):
return Strings.StringItem(self._si)
return None
# -----------------------------------------------------------------------
def GetRegisterList():
"""Returns the register list"""
return idaapi.ph_get_regnames()
# -----------------------------------------------------------------------
def GetIdbDir():
"""
Get IDB directory
This function returns directory path of the current IDB database
"""
return os.path.dirname(idaapi.cvar.database_idb) + os.sep
# -----------------------------------------------------------------------
def GetInstructionList():
"""Returns the instruction list of the current processor module"""
return [i[0] for i in idaapi.ph_get_instruc() if i[0]]
# -----------------------------------------------------------------------
def _Assemble(ea, line):
"""
Please refer to Assemble() - INTERNAL USE ONLY
"""
if type(line) == types.StringType:
lines = [line]
else:
lines = line
ret = []
for line in lines:
seg = idaapi.getseg(ea)
if not seg:
return (False, "No segment at ea")
ip = ea - (idaapi.ask_selector(seg.sel) << 4)
buf = idaapi.AssembleLine(ea, seg.sel, ip, seg.bitness, line)
if not buf:
return (False, "Assembler failed: " + line)
ea += len(buf)
ret.append(buf)
if len(ret) == 1:
ret = ret[0]
return (True, ret)
def Assemble(ea, line):
"""
Assembles one or more lines (does not display an message dialogs)
If line is a list then this function will attempt to assemble all the lines
This function will turn on batch mode temporarily so that no messages are displayed on the screen
@param ea: start address
@return: (False, "Error message") or (True, asm_buf) or (True, [asm_buf1, asm_buf2, asm_buf3])
"""
old_batch = idc.Batch(1)
ret = _Assemble(ea, line)
idc.Batch(old_batch)
return ret
def _copy_obj(src, dest, skip_list = None):
"""
Copy non private/non callable attributes from a class instance to another
@param src: Source class to copy from
@param dest: If it is a string then it designates the new class type that will be created and copied to.
Otherwise dest should be an instance of another class
@return: A new instance or "dest"
"""
if type(dest) == types.StringType:
# instantiate a new destination class of the specified type name?
dest = new.classobj(dest, (), {})
for x in dir(src):
# skip special and private fields
if x.startswith("__") and x.endswith("__"):
continue
# skip items in the skip list
if skip_list and x in skip_list:
continue
t = getattr(src, x)
# skip callable
if callable(t):
continue
setattr(dest, x, t)
return dest
# -----------------------------------------------------------------------
class _reg_dtyp_t(object):
"""
INTERNAL
This class describes a register's number and dtyp.
The equal operator is overloaded so that two instances can be tested for equality
"""
def __init__(self, reg, dtyp):
self.reg = reg
self.dtyp = dtyp
def __eq__(self, other):
return (self.reg == other.reg) and (self.dtyp == other.dtyp)
# -----------------------------------------------------------------------
class _procregs(object):
"""Utility class allowing the users to identify registers in a decoded instruction"""
def __getattr__(self, attr):
ri = idaapi.reg_info_t()
if not idaapi.parse_reg_name(attr, ri):
raise AttributeError()
r = _reg_dtyp_t(ri.reg, ord(idaapi.get_dtyp_by_size(ri.size)))
self.__dict__[attr] = r
return r
def __setattr__(self, attr, value):
raise AttributeError(attr)
# -----------------------------------------------------------------------
class _cpu(object):
"Simple wrapper around GetRegValue/SetRegValue"
def __getattr__(self, name):
#print "cpu.get(%s)"%name
return idc.GetRegValue(name)
def __setattr__(self, name, value):
#print "cpu.set(%s)"%name
return idc.SetRegValue(value, name)
# -----------------------------------------------------------------------
class peutils_t(object):
"""
PE utility class. Retrieves PE information from the database.
Constants from pe.h
"""
PE_NODE = "$ PE header" # netnode name for PE header
PE_ALT_DBG_FPOS = idaapi.BADADDR & -1 # altval() -> translated fpos of debuginfo
PE_ALT_IMAGEBASE = idaapi.BADADDR & -2 # altval() -> loading address (usually pe.imagebase)
PE_ALT_PEHDR_OFF = idaapi.BADADDR & -3 # altval() -> offset of PE header
PE_ALT_NEFLAGS = idaapi.BADADDR & -4 # altval() -> neflags
PE_ALT_TDS_LOADED = idaapi.BADADDR & -5 # altval() -> tds already loaded(1) or invalid(-1)
PE_ALT_PSXDLL = idaapi.BADADDR & -6 # altval() -> if POSIX(x86) imports from PSXDLL netnode
def __init__(self):
self.__penode = idaapi.netnode()
self.__penode.create(peutils_t.PE_NODE)
imagebase = property(
lambda self: self.__penode.altval(peutils_t.PE_ALT_IMAGEBASE)
)
header = property(
lambda self: self.__penode.altval(peutils_t.PE_ALT_PEHDR_OFF)
)
def __str__(self):
return "peutils_t(imagebase=%s, header=%s)" % (hex(self.imagebase), hex(self.header))
# -----------------------------------------------------------------------
cpu = _cpu()
"""This is a special class instance used to access the registers as if they were attributes of this object.
For example to access the EAX register:
print "%x" % cpu.Eax
"""
procregs = _procregs()
"""This object is used to access the processor registers. It is useful when decoding instructions and you want to see which instruction is which.
For example:
x = idautils.DecodeInstruction(here())
if x[0] == procregs.Esp:
print "This operand is the register ESP
"""
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