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#!/usr/bin/python
# Copyright 2005 Nick Mathewson
# See the LICENSE file in the Tor distribution for licensing information.
"""
exitlist -- Given a Tor directory on stdin, lists the Tor servers
that accept connections to given addreses.
example usage:
python2.2 exitlist < ~/.tor/cached-directory
"""
# Requires Python 2.2 or later.
#
# Change this to True if you want more verbose output. By default, we
# only print the IPs of the servers that accept any the listed
# addresses, one per line.
#
VERBOSE = False
#
# Change this to True if you want to reverse the output, and list the
# servers that accept *none* of the listed addresses.
#
INVERSE = False
#
# Change this list to contain all of the target services you are interested
# in. It must contain one entry per line, each consisting of an IPv4 address,
# a colon, and a port number.
#
ADDRESSES_OF_INTEREST = """
192.168.0.1:80
"""
#
# YOU DO NOT NEED TO EDIT AFTER THIS POINT.
#
import sys
import re
import getopt
import socket
import struct
assert sys.version_info >= (2,2)
def maskIP(ip,mask):
return "".join([chr(ord(a) & ord(b)) for a,b in zip(ip,mask)])
def maskFromLong(lng):
return struct.pack("!L", lng)
def maskByBits(n):
return maskFromLong(0xffffffffl ^ ((1L<<(32-n))-1))
class Pattern:
"""
>>> import socket
>>> ip1 = socket.inet_aton("192.169.64.11")
>>> ip2 = socket.inet_aton("192.168.64.11")
>>> ip3 = socket.inet_aton("18.244.0.188")
>>> print Pattern.parse("18.244.0.188")
18.244.0.188/255.255.255.255:1-65535
>>> print Pattern.parse("18.244.0.188/16:*")
18.244.0.0/255.255.0.0:1-65535
>>> print Pattern.parse("18.244.0.188/2.2.2.2:80")
2.0.0.0/2.2.2.2:80-80
>>> print Pattern.parse("192.168.0.1/255.255.00.0:22-25")
192.168.0.0/255.255.0.0:22-25
>>> p1 = Pattern.parse("192.168.0.1/255.255.00.0:22-25")
>>> import socket
>>> p1.appliesTo(ip1, 22)
False
>>> p1.appliesTo(ip2, 22)
True
>>> p1.appliesTo(ip2, 25)
True
>>> p1.appliesTo(ip2, 26)
False
"""
def __init__(self, ip, mask, portMin, portMax):
self.ip = maskIP(ip,mask)
self.mask = mask
self.portMin = portMin
self.portMax = portMax
def __str__(self):
return "%s/%s:%s-%s"%(socket.inet_ntoa(self.ip),
socket.inet_ntoa(self.mask),
self.portMin,
self.portMax)
def parse(s):
if ":" in s:
addrspec, portspec = s.split(":",1)
else:
addrspec, portspec = s, "*"
if addrspec == '*':
ip,mask = "\x00\x00\x00\x00","\x00\x00\x00\x00"
elif '/' not in addrspec:
ip = socket.inet_aton(addrspec)
mask = "\xff\xff\xff\xff"
else:
ip,mask = addrspec.split("/",1)
ip = socket.inet_aton(ip)
if "." in mask:
mask = socket.inet_aton(mask)
else:
mask = maskByBits(int(mask))
if portspec == '*':
portMin = 1
portMax = 65535
elif '-' not in portspec:
portMin = portMax = int(portspec)
else:
portMin, portMax = map(int,portspec.split("-",1))
return Pattern(ip,mask,portMin,portMax)
parse = staticmethod(parse)
def appliesTo(self, ip, port):
return ((maskIP(ip,self.mask) == self.ip) and
(self.portMin <= port <= self.portMax))
class Policy:
"""
>>> import socket
>>> ip1 = socket.inet_aton("192.169.64.11")
>>> ip2 = socket.inet_aton("192.168.64.11")
>>> ip3 = socket.inet_aton("18.244.0.188")
>>> pol = Policy.parseLines(["reject *:80","accept 18.244.0.188:*"])
>>> print str(pol).strip()
reject 0.0.0.0/0.0.0.0:80-80
accept 18.244.0.188/255.255.255.255:1-65535
>>> pol.accepts(ip1,80)
False
>>> pol.accepts(ip3,80)
False
>>> pol.accepts(ip3,81)
True
"""
def __init__(self, lst):
self.lst = lst
def parseLines(lines):
r = []
for item in lines:
a,p=item.split(" ",1)
if a == 'accept':
a = True
elif a == 'reject':
a = False
else:
raise ValueError("Unrecognized action %r",a)
p = Pattern.parse(p)
r.append((p,a))
return Policy(r)
parseLines = staticmethod(parseLines)
def __str__(self):
r = []
for pat, accept in self.lst:
rule = accept and "accept" or "reject"
r.append("%s %s\n"%(rule,pat))
return "".join(r)
def accepts(self, ip, port):
for pattern,accept in self.lst:
if pattern.appliesTo(ip,port):
return accept
return True
class Server:
def __init__(self, name, ip, policy):
self.name = name
self.ip = ip
self.policy = policy
def run():
servers = []
policy = []
name = ip = None
for line in sys.stdin.xreadlines():
if line.startswith('router '):
if name:
servers.append(Server(name, ip, Policy.parseLines(policy)))
_, name, ip, rest = line.split(" ", 3)
policy = []
elif line.startswith('accept ') or line.startswith('reject '):
policy.append(line.strip())
if name:
servers.append(Server(name, ip, Policy.parseLines(policy)))
targets = []
for line in ADDRESSES_OF_INTEREST.split("\n"):
line = line.strip()
if not line: continue
p = Pattern.parse(line)
targets.append((p.ip, p.portMin))
accepters, rejecters = [], []
for s in servers:
for ip,port in targets:
if s.policy.accepts(ip,port):
accepters.append(s)
break
else:
rejecters.append(s)
if INVERSE:
printlist = rejecters
else:
printlist = accepters
if VERBOSE:
for s in printlist:
print "%s\t%s"%(s.ip,s.name)
else:
for s in printlist:
print s.ip
def _test():
import doctest, exitparse
return doctest.testmod(exitparse)
#_test()
run()
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