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from __future__ import absolute_import
from __future__ import division
import itertools
import os
import re
import six
import sys
from types import ModuleType
from pwnlib import constants
from pwnlib.context import context
from pwnlib.shellcraft import internal
from pwnlib.util import packing
class module(ModuleType):
_templates = []
def __init__(self, name, directory):
super(module, self).__init__(name)
# Insert nice properties
self.__dict__.update({
'__file__': __file__,
'__package__': __package__,
'__path__': __path__,
})
# Save the shellcode directory
self._dir = directory
# Find the absolute path of the directory
self._absdir = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'templates', self._dir)
# Get the docstring
with open(os.path.join(self._absdir, "__doc__")) as fd:
self.__doc__ = fd.read()
# Insert into the module list
sys.modules[self.__name__] = self
def _get_source(self, template):
assert template in self.templates
return os.path.join(self._absdir, *template.split('.')) + '.asm'
def __lazyinit__(self):
# Create a dictionary of submodules
self._submodules = {}
self._shellcodes = {}
for name in os.listdir(self._absdir):
path = os.path.join(self._absdir, name)
if os.path.isdir(path):
self._submodules[name] = module(self.__name__ + '.' + name, os.path.join(self._dir, name))
elif os.path.isfile(path) and name != '__doc__' and name[0] != '.':
funcname, _ext = os.path.splitext(name)
if not re.match('^[a-zA-Z_][a-zA-Z0-9_]*$', funcname):
raise ValueError("found illegal filename, %r" % name)
self._shellcodes[funcname] = name
# Put the submodules into toplevel
self.__dict__.update(self._submodules)
# These are exported
self.__all__ = sorted(itertools.chain(self._shellcodes.keys(), self._submodules.keys()))
# Make sure this is not called again
self.__lazyinit__ = None
def __getattr__(self, key):
self.__lazyinit__ and self.__lazyinit__()
# Maybe the lazyinit added it
if key in self.__dict__:
return self.__dict__[key]
# This function lazy-loads the shellcodes
if key in self._shellcodes:
real = internal.make_function(key, self._shellcodes[key], self._dir)
setattr(self, key, real)
return real
for m in self._context_modules():
try:
return getattr(m, key)
except AttributeError:
pass
raise AttributeError("'module' object has no attribute '%s'" % key)
def __dir__(self):
# This function lists the available submodules, available shellcodes
# and potentially shellcodes available in submodules that should be
# avilable because of the context
self.__lazyinit__ and self.__lazyinit__()
result = list(self._submodules.keys())
result.extend(('__file__', '__package__', '__path__',
'__all__', '__name__'))
result.extend(self.__shellcodes__())
return result
def _context_modules(self):
self.__lazyinit__ and self.__lazyinit__()
for k, m in self._submodules.items():
if k in [context.arch, context.os, 'syscalls']:
yield m
def __shellcodes__(self):
self.__lazyinit__ and self.__lazyinit__()
result = list(self._shellcodes.keys())
for m in self._context_modules():
result.extend(m.__shellcodes__())
return result
@property
def templates(self):
if self._templates:
return self._templates
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
templates = []
for root, _, files in os.walk(template_dir, followlinks=True):
for file in filter(lambda x: x.endswith('.asm'), files):
value = os.path.splitext(file)[0]
value = os.path.join(root, value)
value = value.replace(template_dir, '')
value = value.replace(os.path.sep, '.')
value = value.lstrip('.')
templates.append(value)
templates = sorted(templates)
self._templates = templates
return templates
def eval(self, item):
if isinstance(item, six.integer_types):
return item
return constants.eval(item)
def pretty(self, n, comment=True):
if isinstance(n, (str, bytes, list, tuple, dict)):
r = repr(n)
if not comment: # then it can be inside a comment!
r = r.replace('*/', r'\x2a/')
return r
if not isinstance(n, six.integer_types):
return n
if isinstance(n, constants.Constant):
if comment: return '%s /* %s */' % (n,self.pretty(int(n)))
else: return '%s (%s)' % (n,self.pretty(int(n)))
elif abs(n) < 10:
return '%d' % n
else:
return '%#x' % n
def okay(self, s, *a, **kw):
if isinstance(s, six.integer_types):
s = packing.pack(s, *a, **kw)
return b'\0' not in s and b'\n' not in s
from pwnlib.shellcraft import registers
# To prevent garbage collection
tether = sys.modules[__name__]
# Create the module structure
shellcraft = module(__name__, '')
class LazyImporter:
def find_module(self, fullname, path=None):
if not fullname.startswith('pwnlib.shellcraft.'):
return None
parts = fullname.split('.')[2:]
cur = shellcraft
for part in parts:
cur = getattr(cur, part, None)
if not isinstance(cur, ModuleType):
return None
return self
def load_module(self, fullname):
return sys.modules[fullname]
sys.meta_path.append(LazyImporter())
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