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|
## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license
"""
Generators and packet meta classes.
"""
###############
## Generators ##
################
import re,random,socket
import config
import error
class Gen(object):
def __iter__(self):
return iter([])
class SetGen(Gen):
def __init__(self, set, _iterpacket=1):
self._iterpacket=_iterpacket
if type(set) is list:
self.set = set
elif isinstance(set, BasePacketList):
self.set = list(set)
else:
self.set = [set]
def transf(self, element):
return element
def __iter__(self):
for i in self.set:
if (type(i) is tuple) and (len(i) == 2) and type(i[0]) is int and type(i[1]) is int:
if (i[0] <= i[1]):
j=i[0]
while j <= i[1]:
yield j
j += 1
elif isinstance(i, Gen) and (self._iterpacket or not isinstance(i,BasePacket)):
for j in i:
yield j
else:
yield i
def __repr__(self):
return "<SetGen %s>" % self.set.__repr__()
class Net(Gen):
"""Generate a list of IPs from a network address or a name"""
name = "ip"
ipaddress = re.compile(r"^(\*|[0-2]?[0-9]?[0-9](-[0-2]?[0-9]?[0-9])?)\.(\*|[0-2]?[0-9]?[0-9](-[0-2]?[0-9]?[0-9])?)\.(\*|[0-2]?[0-9]?[0-9](-[0-2]?[0-9]?[0-9])?)\.(\*|[0-2]?[0-9]?[0-9](-[0-2]?[0-9]?[0-9])?)(/[0-3]?[0-9])?$")
@staticmethod
def _parse_digit(a,netmask):
netmask = min(8,max(netmask,0))
if a == "*":
a = (0,256)
elif a.find("-") >= 0:
x,y = map(int,a.split("-"))
if x > y:
y = x
a = (x & (0xffL<<netmask) , max(y, (x | (0xffL>>(8-netmask))))+1)
else:
a = (int(a) & (0xffL<<netmask),(int(a) | (0xffL>>(8-netmask)))+1)
return a
@classmethod
def _parse_net(cls, net):
tmp=net.split('/')+["32"]
if not cls.ipaddress.match(net):
tmp[0]=socket.gethostbyname(tmp[0])
netmask = int(tmp[1])
return map(lambda x,y: cls._parse_digit(x,y), tmp[0].split("."), map(lambda x,nm=netmask: x-nm, (8,16,24,32))),netmask
def __init__(self, net):
self.repr=net
self.parsed,self.netmask = self._parse_net(net)
def __iter__(self):
for d in xrange(*self.parsed[3]):
for c in xrange(*self.parsed[2]):
for b in xrange(*self.parsed[1]):
for a in xrange(*self.parsed[0]):
yield "%i.%i.%i.%i" % (a,b,c,d)
def choice(self):
ip = []
for v in self.parsed:
ip.append(str(random.randint(v[0],v[1]-1)))
return ".".join(ip)
def __repr__(self):
return "Net(%r)" % self.repr
def __eq__(self, other):
if hasattr(other, "parsed"):
p2 = other.parsed
else:
p2,nm2 = self._parse_net(other)
return self.parsed == p2
def __contains__(self, other):
if hasattr(other, "parsed"):
p2 = other.parsed
else:
p2,nm2 = self._parse_net(other)
for (a1,b1),(a2,b2) in zip(self.parsed,p2):
if a1 > a2 or b1 < b2:
return False
return True
def __rcontains__(self, other):
return self in self.__class__(other)
class OID(Gen):
name = "OID"
def __init__(self, oid):
self.oid = oid
self.cmpt = []
fmt = []
for i in oid.split("."):
if "-" in i:
fmt.append("%i")
self.cmpt.append(tuple(map(int, i.split("-"))))
else:
fmt.append(i)
self.fmt = ".".join(fmt)
def __repr__(self):
return "OID(%r)" % self.oid
def __iter__(self):
ii = [k[0] for k in self.cmpt]
while 1:
yield self.fmt % tuple(ii)
i = 0
while 1:
if i >= len(ii):
raise StopIteration
if ii[i] < self.cmpt[i][1]:
ii[i]+=1
break
else:
ii[i] = self.cmpt[i][0]
i += 1
######################################
## Packet abstract and base classes ##
######################################
class Packet_metaclass(type):
def __new__(cls, name, bases, dct):
if "fields_desc" in dct: # perform resolution of references to other packets
current_fld = dct["fields_desc"]
resolved_fld = []
for f in current_fld:
if isinstance(f, Packet_metaclass): # reference to another fields_desc
for f2 in f.fields_desc:
resolved_fld.append(f2)
else:
resolved_fld.append(f)
else: # look for a field_desc in parent classes
resolved_fld = None
for b in bases:
if hasattr(b,"fields_desc"):
resolved_fld = b.fields_desc
break
if resolved_fld: # perform default value replacements
final_fld = []
for f in resolved_fld:
if f.name in dct:
f = f.copy()
f.default = dct[f.name]
del(dct[f.name])
final_fld.append(f)
dct["fields_desc"] = final_fld
newcls = super(Packet_metaclass, cls).__new__(cls, name, bases, dct)
if hasattr(newcls,"register_variant"):
newcls.register_variant()
for f in newcls.fields_desc:
f.register_owner(newcls)
config.conf.layers.register(newcls)
return newcls
def __getattr__(self, attr):
for k in self.fields_desc:
if k.name == attr:
return k
raise AttributeError(attr)
def __call__(cls, *args, **kargs):
if "dispatch_hook" in cls.__dict__:
cls = cls.dispatch_hook(*args, **kargs)
i = cls.__new__(cls, cls.__name__, cls.__bases__, cls.__dict__)
i.__init__(*args, **kargs)
return i
class NewDefaultValues(Packet_metaclass):
"""NewDefaultValues is deprecated (not needed anymore)
remove this:
__metaclass__ = NewDefaultValues
and it should still work.
"""
def __new__(cls, name, bases, dct):
from error import log_loading
import traceback
try:
for tb in traceback.extract_stack()+[("??",-1,None,"")]:
f,l,_,line = tb
if line.startswith("class"):
break
except:
f,l="??",-1
raise
log_loading.warning("Deprecated (no more needed) use of NewDefaultValues (%s l. %i)." % (f,l))
return super(NewDefaultValues, cls).__new__(cls, name, bases, dct)
class BasePacket(Gen):
pass
#############################
## Packet list base classe ##
#############################
class BasePacketList:
pass
|
