/usr/share/pyshared/scapy/automaton.py is in python-scapy 2.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## 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
"""
Automata with states, transitions and actions.
"""
from __future__ import with_statement
import types,itertools,time,os,sys,socket
from select import select
from collections import deque
import thread
from config import conf
from utils import do_graph
from error import log_interactive
from plist import PacketList
from data import MTU
from supersocket import SuperSocket
class ObjectPipe:
def __init__(self):
self.rd,self.wr = os.pipe()
self.queue = deque()
def fileno(self):
return self.rd
def send(self, obj):
self.queue.append(obj)
os.write(self.wr,"X")
def recv(self, n=0):
os.read(self.rd,1)
return self.queue.popleft()
class Message:
def __init__(self, **args):
self.__dict__.update(args)
def __repr__(self):
return "<Message %s>" % " ".join("%s=%r"%(k,v)
for (k,v) in self.__dict__.iteritems()
if not k.startswith("_"))
class _instance_state:
def __init__(self, instance):
self.im_self = instance.im_self
self.im_func = instance.im_func
self.im_class = instance.im_class
def __getattr__(self, attr):
return getattr(self.im_func, attr)
def __call__(self, *args, **kargs):
return self.im_func(self.im_self, *args, **kargs)
def breaks(self):
return self.im_self.add_breakpoints(self.im_func)
def intercepts(self):
return self.im_self.add_interception_points(self.im_func)
def unbreaks(self):
return self.im_self.remove_breakpoints(self.im_func)
def unintercepts(self):
return self.im_self.remove_interception_points(self.im_func)
##############
## Automata ##
##############
class ATMT:
STATE = "State"
ACTION = "Action"
CONDITION = "Condition"
RECV = "Receive condition"
TIMEOUT = "Timeout condition"
IOEVENT = "I/O event"
class NewStateRequested(Exception):
def __init__(self, state_func, automaton, *args, **kargs):
self.func = state_func
self.state = state_func.atmt_state
self.initial = state_func.atmt_initial
self.error = state_func.atmt_error
self.final = state_func.atmt_final
Exception.__init__(self, "Request state [%s]" % self.state)
self.automaton = automaton
self.args = args
self.kargs = kargs
self.action_parameters() # init action parameters
def action_parameters(self, *args, **kargs):
self.action_args = args
self.action_kargs = kargs
return self
def run(self):
return self.func(self.automaton, *self.args, **self.kargs)
def __repr__(self):
return "NewStateRequested(%s)" % self.state
@staticmethod
def state(initial=0,final=0,error=0):
def deco(f,initial=initial, final=final):
f.atmt_type = ATMT.STATE
f.atmt_state = f.func_name
f.atmt_initial = initial
f.atmt_final = final
f.atmt_error = error
def state_wrapper(self, *args, **kargs):
return ATMT.NewStateRequested(f, self, *args, **kargs)
state_wrapper.func_name = "%s_wrapper" % f.func_name
state_wrapper.atmt_type = ATMT.STATE
state_wrapper.atmt_state = f.func_name
state_wrapper.atmt_initial = initial
state_wrapper.atmt_final = final
state_wrapper.atmt_error = error
state_wrapper.atmt_origfunc = f
return state_wrapper
return deco
@staticmethod
def action(cond, prio=0):
def deco(f,cond=cond):
if not hasattr(f,"atmt_type"):
f.atmt_cond = {}
f.atmt_type = ATMT.ACTION
f.atmt_cond[cond.atmt_condname] = prio
return f
return deco
@staticmethod
def condition(state, prio=0):
def deco(f, state=state):
f.atmt_type = ATMT.CONDITION
f.atmt_state = state.atmt_state
f.atmt_condname = f.func_name
f.atmt_prio = prio
return f
return deco
@staticmethod
def receive_condition(state, prio=0):
def deco(f, state=state):
f.atmt_type = ATMT.RECV
f.atmt_state = state.atmt_state
f.atmt_condname = f.func_name
f.atmt_prio = prio
return f
return deco
@staticmethod
def ioevent(state, name, prio=0, as_supersocket=None):
def deco(f, state=state):
f.atmt_type = ATMT.IOEVENT
f.atmt_state = state.atmt_state
f.atmt_condname = f.func_name
f.atmt_ioname = name
f.atmt_prio = prio
f.atmt_as_supersocket = as_supersocket
return f
return deco
@staticmethod
def timeout(state, timeout):
def deco(f, state=state, timeout=timeout):
f.atmt_type = ATMT.TIMEOUT
f.atmt_state = state.atmt_state
f.atmt_timeout = timeout
f.atmt_condname = f.func_name
return f
return deco
class _ATMT_Command:
RUN = "RUN"
NEXT = "NEXT"
FREEZE = "FREEZE"
STOP = "STOP"
END = "END"
EXCEPTION = "EXCEPTION"
SINGLESTEP = "SINGLESTEP"
BREAKPOINT = "BREAKPOINT"
INTERCEPT = "INTERCEPT"
ACCEPT = "ACCEPT"
REPLACE = "REPLACE"
REJECT = "REJECT"
class _ATMT_supersocket(SuperSocket):
def __init__(self, name, ioevent, automaton, proto, args, kargs):
self.name = name
self.ioevent = ioevent
self.proto = proto
self.spa,self.spb = socket.socketpair(socket.AF_UNIX, socket.SOCK_DGRAM)
kargs["external_fd"] = {ioevent:self.spb}
self.atmt = automaton(*args, **kargs)
self.atmt.runbg()
def fileno(self):
return self.spa.fileno()
def send(self, s):
if type(s) is not str:
s = str(s)
return self.spa.send(s)
def recv(self, n=MTU):
r = self.spa.recv(n)
if self.proto is not None:
r = self.proto(r)
return r
def close(self):
pass
class _ATMT_to_supersocket:
def __init__(self, name, ioevent, automaton):
self.name = name
self.ioevent = ioevent
self.automaton = automaton
def __call__(self, proto, *args, **kargs):
return _ATMT_supersocket(self.name, self.ioevent, self.automaton, proto, args, kargs)
class Automaton_metaclass(type):
def __new__(cls, name, bases, dct):
cls = super(Automaton_metaclass, cls).__new__(cls, name, bases, dct)
cls.states={}
cls.state = None
cls.recv_conditions={}
cls.conditions={}
cls.ioevents={}
cls.timeout={}
cls.actions={}
cls.initial_states=[]
cls.ionames = []
cls.iosupersockets = []
members = {}
classes = [cls]
while classes:
c = classes.pop(0) # order is important to avoid breaking method overloading
classes += list(c.__bases__)
for k,v in c.__dict__.iteritems():
if k not in members:
members[k] = v
decorated = [v for v in members.itervalues()
if type(v) is types.FunctionType and hasattr(v, "atmt_type")]
for m in decorated:
if m.atmt_type == ATMT.STATE:
s = m.atmt_state
cls.states[s] = m
cls.recv_conditions[s]=[]
cls.ioevents[s]=[]
cls.conditions[s]=[]
cls.timeout[s]=[]
if m.atmt_initial:
cls.initial_states.append(m)
elif m.atmt_type in [ATMT.CONDITION, ATMT.RECV, ATMT.TIMEOUT, ATMT.IOEVENT]:
cls.actions[m.atmt_condname] = []
for m in decorated:
if m.atmt_type == ATMT.CONDITION:
cls.conditions[m.atmt_state].append(m)
elif m.atmt_type == ATMT.RECV:
cls.recv_conditions[m.atmt_state].append(m)
elif m.atmt_type == ATMT.IOEVENT:
cls.ioevents[m.atmt_state].append(m)
cls.ionames.append(m.atmt_ioname)
if m.atmt_as_supersocket is not None:
cls.iosupersockets.append(m)
elif m.atmt_type == ATMT.TIMEOUT:
cls.timeout[m.atmt_state].append((m.atmt_timeout, m))
elif m.atmt_type == ATMT.ACTION:
for c in m.atmt_cond:
cls.actions[c].append(m)
for v in cls.timeout.itervalues():
v.sort(lambda (t1,f1),(t2,f2): cmp(t1,t2))
v.append((None, None))
for v in itertools.chain(cls.conditions.itervalues(),
cls.recv_conditions.itervalues(),
cls.ioevents.itervalues()):
v.sort(lambda c1,c2: cmp(c1.atmt_prio,c2.atmt_prio))
for condname,actlst in cls.actions.iteritems():
actlst.sort(lambda c1,c2: cmp(c1.atmt_cond[condname], c2.atmt_cond[condname]))
for ioev in cls.iosupersockets:
setattr(cls, ioev.atmt_as_supersocket, _ATMT_to_supersocket(ioev.atmt_as_supersocket, ioev.atmt_ioname, cls))
return cls
def graph(self, **kargs):
s = 'digraph "%s" {\n' % self.__class__.__name__
se = "" # Keep initial nodes at the begining for better rendering
for st in self.states.itervalues():
if st.atmt_initial:
se = ('\t"%s" [ style=filled, fillcolor=blue, shape=box, root=true];\n' % st.atmt_state)+se
elif st.atmt_final:
se += '\t"%s" [ style=filled, fillcolor=green, shape=octagon ];\n' % st.atmt_state
elif st.atmt_error:
se += '\t"%s" [ style=filled, fillcolor=red, shape=octagon ];\n' % st.atmt_state
s += se
for st in self.states.values():
for n in st.atmt_origfunc.func_code.co_names+st.atmt_origfunc.func_code.co_consts:
if n in self.states:
s += '\t"%s" -> "%s" [ color=green ];\n' % (st.atmt_state,n)
for c,k,v in ([("purple",k,v) for k,v in self.conditions.items()]+
[("red",k,v) for k,v in self.recv_conditions.items()]+
[("orange",k,v) for k,v in self.ioevents.items()]):
for f in v:
for n in f.func_code.co_names+f.func_code.co_consts:
if n in self.states:
l = f.atmt_condname
for x in self.actions[f.atmt_condname]:
l += "\\l>[%s]" % x.func_name
s += '\t"%s" -> "%s" [label="%s", color=%s];\n' % (k,n,l,c)
for k,v in self.timeout.iteritems():
for t,f in v:
if f is None:
continue
for n in f.func_code.co_names+f.func_code.co_consts:
if n in self.states:
l = "%s/%.1fs" % (f.atmt_condname,t)
for x in self.actions[f.atmt_condname]:
l += "\\l>[%s]" % x.func_name
s += '\t"%s" -> "%s" [label="%s",color=blue];\n' % (k,n,l)
s += "}\n"
return do_graph(s, **kargs)
class Automaton:
__metaclass__ = Automaton_metaclass
## Methods to overload
def parse_args(self, debug=0, store=1, **kargs):
self.debug_level=debug
self.socket_kargs = kargs
self.store_packets = store
def master_filter(self, pkt):
return True
def my_send(self, pkt):
self.send_sock.send(pkt)
## Utility classes and exceptions
class _IO_fdwrapper:
def __init__(self,rd,wr):
if rd is not None and type(rd) is not int:
rd = rd.fileno()
if wr is not None and type(wr) is not int:
wr = wr.fileno()
self.rd = rd
self.wr = wr
def fileno(self):
return self.rd
def read(self, n=65535):
return os.read(self.rd, n)
def write(self, msg):
return os.write(self.wr,msg)
def recv(self, n=65535):
return self.read(n)
def send(self, msg):
return self.write(msg)
class _IO_mixer:
def __init__(self,rd,wr):
self.rd = rd
self.wr = wr
def fileno(self):
if type(self.rd) is int:
return self.rd
return self.rd.fileno()
def recv(self, n=None):
return self.rd.recv(n)
def read(self, n=None):
return self.rd.recv(n)
def send(self, msg):
return self.wr.send(msg)
def write(self, msg):
return self.wr.send(msg)
class AutomatonException(Exception):
def __init__(self, msg, state=None, result=None):
Exception.__init__(self, msg)
self.state = state
self.result = result
class AutomatonError(AutomatonException):
pass
class ErrorState(AutomatonException):
pass
class Stuck(AutomatonException):
pass
class AutomatonStopped(AutomatonException):
pass
class Breakpoint(AutomatonStopped):
pass
class Singlestep(AutomatonStopped):
pass
class InterceptionPoint(AutomatonStopped):
def __init__(self, msg, state=None, result=None, packet=None):
Automaton.AutomatonStopped.__init__(self, msg, state=state, result=result)
self.packet = packet
class CommandMessage(AutomatonException):
pass
## Services
def debug(self, lvl, msg):
if self.debug_level >= lvl:
log_interactive.debug(msg)
def send(self, pkt):
if self.state.state in self.interception_points:
self.debug(3,"INTERCEPT: packet intercepted: %s" % pkt.summary())
self.intercepted_packet = pkt
cmd = Message(type = _ATMT_Command.INTERCEPT, state=self.state, pkt=pkt)
self.cmdout.send(cmd)
cmd = self.cmdin.recv()
self.intercepted_packet = None
if cmd.type == _ATMT_Command.REJECT:
self.debug(3,"INTERCEPT: packet rejected")
return
elif cmd.type == _ATMT_Command.REPLACE:
pkt = cmd.pkt
self.debug(3,"INTERCEPT: packet replaced by: %s" % pkt.summary())
elif cmd.type == _ATMT_Command.ACCEPT:
self.debug(3,"INTERCEPT: packet accepted")
else:
raise self.AutomatonError("INTERCEPT: unkown verdict: %r" % cmd.type)
self.my_send(pkt)
self.debug(3,"SENT : %s" % pkt.summary())
self.packets.append(pkt.copy())
## Internals
def __init__(self, *args, **kargs):
external_fd = kargs.pop("external_fd",{})
self.send_sock_class = kargs.pop("ll", conf.L3socket)
self.started = thread.allocate_lock()
self.threadid = None
self.breakpointed = None
self.breakpoints = set()
self.interception_points = set()
self.intercepted_packet = None
self.debug_level=0
self.init_args=args
self.init_kargs=kargs
self.io = type.__new__(type, "IOnamespace",(),{})
self.oi = type.__new__(type, "IOnamespace",(),{})
self.cmdin = ObjectPipe()
self.cmdout = ObjectPipe()
self.ioin = {}
self.ioout = {}
for n in self.ionames:
extfd = external_fd.get(n)
if type(extfd) is not tuple:
extfd = (extfd,extfd)
ioin,ioout = extfd
if ioin is None:
ioin = ObjectPipe()
elif type(ioin) is not types.InstanceType:
ioin = self._IO_fdwrapper(ioin,None)
if ioout is None:
ioout = ObjectPipe()
elif type(ioout) is not types.InstanceType:
ioout = self._IO_fdwrapper(None,ioout)
self.ioin[n] = ioin
self.ioout[n] = ioout
ioin.ioname = n
ioout.ioname = n
setattr(self.io, n, self._IO_mixer(ioout,ioin))
setattr(self.oi, n, self._IO_mixer(ioin,ioout))
for stname in self.states:
setattr(self, stname,
_instance_state(getattr(self, stname)))
self.parse_args(*args, **kargs)
self.start()
def __iter__(self):
return self
def __del__(self):
self.stop()
def _run_condition(self, cond, *args, **kargs):
try:
self.debug(5, "Trying %s [%s]" % (cond.atmt_type, cond.atmt_condname))
cond(self,*args, **kargs)
except ATMT.NewStateRequested, state_req:
self.debug(2, "%s [%s] taken to state [%s]" % (cond.atmt_type, cond.atmt_condname, state_req.state))
if cond.atmt_type == ATMT.RECV:
self.packets.append(args[0])
for action in self.actions[cond.atmt_condname]:
self.debug(2, " + Running action [%s]" % action.func_name)
action(self, *state_req.action_args, **state_req.action_kargs)
raise
except Exception,e:
self.debug(2, "%s [%s] raised exception [%s]" % (cond.atmt_type, cond.atmt_condname, e))
raise
else:
self.debug(2, "%s [%s] not taken" % (cond.atmt_type, cond.atmt_condname))
def _do_start(self, *args, **kargs):
thread.start_new_thread(self._do_control, args, kargs)
def _do_control(self, *args, **kargs):
with self.started:
self.threadid = thread.get_ident()
# Update default parameters
a = args+self.init_args[len(args):]
k = self.init_kargs.copy()
k.update(kargs)
self.parse_args(*a,**k)
# Start the automaton
self.state=self.initial_states[0](self)
self.send_sock = self.send_sock_class()
self.listen_sock = conf.L2listen(**self.socket_kargs)
self.packets = PacketList(name="session[%s]"%self.__class__.__name__)
singlestep = True
iterator = self._do_iter()
self.debug(3, "Starting control thread [tid=%i]" % self.threadid)
try:
while True:
c = self.cmdin.recv()
self.debug(5, "Received command %s" % c.type)
if c.type == _ATMT_Command.RUN:
singlestep = False
elif c.type == _ATMT_Command.NEXT:
singlestep = True
elif c.type == _ATMT_Command.FREEZE:
continue
elif c.type == _ATMT_Command.STOP:
break
while True:
state = iterator.next()
if isinstance(state, self.CommandMessage):
break
elif isinstance(state, self.Breakpoint):
c = Message(type=_ATMT_Command.BREAKPOINT,state=state)
self.cmdout.send(c)
break
if singlestep:
c = Message(type=_ATMT_Command.SINGLESTEP,state=state)
self.cmdout.send(c)
break
except StopIteration,e:
c = Message(type=_ATMT_Command.END, result=e.args[0])
self.cmdout.send(c)
except Exception,e:
self.debug(3, "Transfering exception [%s] from tid=%i"% (e,self.threadid))
m = Message(type = _ATMT_Command.EXCEPTION, exception=e, exc_info=sys.exc_info())
self.cmdout.send(m)
self.debug(3, "Stopping control thread (tid=%i)"%self.threadid)
self.threadid = None
def _do_iter(self):
while True:
try:
self.debug(1, "## state=[%s]" % self.state.state)
# Entering a new state. First, call new state function
if self.state.state in self.breakpoints and self.state.state != self.breakpointed:
self.breakpointed = self.state.state
yield self.Breakpoint("breakpoint triggered on state %s" % self.state.state,
state = self.state.state)
self.breakpointed = None
state_output = self.state.run()
if self.state.error:
raise self.ErrorState("Reached %s: [%r]" % (self.state.state, state_output),
result=state_output, state=self.state.state)
if self.state.final:
raise StopIteration(state_output)
if state_output is None:
state_output = ()
elif type(state_output) is not list:
state_output = state_output,
# Then check immediate conditions
for cond in self.conditions[self.state.state]:
self._run_condition(cond, *state_output)
# If still there and no conditions left, we are stuck!
if ( len(self.recv_conditions[self.state.state]) == 0 and
len(self.ioevents[self.state.state]) == 0 and
len(self.timeout[self.state.state]) == 1 ):
raise self.Stuck("stuck in [%s]" % self.state.state,
state=self.state.state, result=state_output)
# Finally listen and pay attention to timeouts
expirations = iter(self.timeout[self.state.state])
next_timeout,timeout_func = expirations.next()
t0 = time.time()
fds = [self.cmdin]
if len(self.recv_conditions[self.state.state]) > 0:
fds.append(self.listen_sock)
for ioev in self.ioevents[self.state.state]:
fds.append(self.ioin[ioev.atmt_ioname])
while 1:
t = time.time()-t0
if next_timeout is not None:
if next_timeout <= t:
self._run_condition(timeout_func, *state_output)
next_timeout,timeout_func = expirations.next()
if next_timeout is None:
remain = None
else:
remain = next_timeout-t
self.debug(5, "Select on %r" % fds)
r,_,_ = select(fds,[],[],remain)
self.debug(5, "Selected %r" % r)
for fd in r:
self.debug(5, "Looking at %r" % fd)
if fd == self.cmdin:
yield self.CommandMessage("Received command message")
elif fd == self.listen_sock:
pkt = self.listen_sock.recv(MTU)
if pkt is not None:
if self.master_filter(pkt):
self.debug(3, "RECVD: %s" % pkt.summary())
for rcvcond in self.recv_conditions[self.state.state]:
self._run_condition(rcvcond, pkt, *state_output)
else:
self.debug(4, "FILTR: %s" % pkt.summary())
else:
self.debug(3, "IOEVENT on %s" % fd.ioname)
for ioevt in self.ioevents[self.state.state]:
if ioevt.atmt_ioname == fd.ioname:
self._run_condition(ioevt, fd, *state_output)
except ATMT.NewStateRequested,state_req:
self.debug(2, "switching from [%s] to [%s]" % (self.state.state,state_req.state))
self.state = state_req
yield state_req
## Public API
def add_interception_points(self, *ipts):
for ipt in ipts:
if hasattr(ipt,"atmt_state"):
ipt = ipt.atmt_state
self.interception_points.add(ipt)
def remove_interception_points(self, *ipts):
for ipt in ipts:
if hasattr(ipt,"atmt_state"):
ipt = ipt.atmt_state
self.interception_points.discard(ipt)
def add_breakpoints(self, *bps):
for bp in bps:
if hasattr(bp,"atmt_state"):
bp = bp.atmt_state
self.breakpoints.add(bp)
def remove_breakpoints(self, *bps):
for bp in bps:
if hasattr(bp,"atmt_state"):
bp = bp.atmt_state
self.breakpoints.discard(bp)
def start(self, *args, **kargs):
if not self.started.locked():
self._do_start(*args, **kargs)
def run(self, resume=None, wait=True):
if resume is None:
resume = Message(type = _ATMT_Command.RUN)
self.cmdin.send(resume)
if wait:
try:
c = self.cmdout.recv()
except KeyboardInterrupt:
self.cmdin.send(Message(type = _ATMT_Command.FREEZE))
return
if c.type == _ATMT_Command.END:
return c.result
elif c.type == _ATMT_Command.INTERCEPT:
raise self.InterceptionPoint("packet intercepted", state=c.state.state, packet=c.pkt)
elif c.type == _ATMT_Command.SINGLESTEP:
raise self.Singlestep("singlestep state=[%s]"%c.state.state, state=c.state.state)
elif c.type == _ATMT_Command.BREAKPOINT:
raise self.Breakpoint("breakpoint triggered on state [%s]"%c.state.state, state=c.state.state)
elif c.type == _ATMT_Command.EXCEPTION:
raise c.exc_info[0],c.exc_info[1],c.exc_info[2]
def runbg(self, resume=None, wait=False):
self.run(resume, wait)
def next(self):
return self.run(resume = Message(type=_ATMT_Command.NEXT))
def stop(self):
self.cmdin.send(Message(type=_ATMT_Command.STOP))
with self.started:
# Flush command pipes
while True:
r,_,_ = select([self.cmdin, self.cmdout],[],[],0)
if not r:
break
for fd in r:
fd.recv()
def restart(self, *args, **kargs):
self.stop()
self.start(*args, **kargs)
def accept_packet(self, pkt=None, wait=False):
rsm = Message()
if pkt is None:
rsm.type = _ATMT_Command.ACCEPT
else:
rsm.type = _ATMT_Command.REPLACE
rsm.pkt = pkt
return self.run(resume=rsm, wait=wait)
def reject_packet(self, wait=False):
rsm = Message(type = _ATMT_Command.REJECT)
return self.run(resume=rsm, wait=wait)
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