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Added first part of the RFC1149 implementation

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seba 2011-12-21 03:27:59 +01:00
parent b9a96f6bc4
commit 7899846338
5 changed files with 294 additions and 0 deletions
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7
tunnel/rfc1149/README Normal file
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Installation
============
You need
* tweepy >= 1.8 (https://github.com/tweepy/tweepy.git)
* python-bytearray

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tunnel/rfc1149/conf.py Normal file
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# ___________________________________________________
# | |
# | ircvpn - irc virtual public network configuration |
# |___________________________________________________|
import os
Conf = {
# ======== network settings ========
# ipsettings for the device
'devname': '',
'network':
{
'address': '10.10.10.74',
'netmask': '255.255.255.0',
#gateway: '',
'mtu': 1400,
},
# ======== Twitter settings ========
'twitter':
{
# account to read network traffic from
'endpoint': None,
# if set to None, these will be overwritten by config_auth.py
# if they are set to none there, this script will give you an
# url to authorize this script to twitter and write the
# access key / access secret to config_auth.py
'ACCESS_KEY': None,
'ACCESS_SECRET': None,
},
}
import conf_auth

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tunnel/rfc1149/conf_auth.py Normal file
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from conf import Conf
# WARNING: This config will be overwritten if you use the scripts internal
# way to get an access key.
if not Conf['twitter']['ACCESS_KEY']:
Conf['twitter']['ACCESS_KEY'] = None
Conf['twitter']['ACCESS_SECRET'] = None

129
tunnel/rfc1149/rfc1149.py Executable file
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import base64
import logging
import math
import re
import sys
import threading
import time
import tweepy
from uphelper import UPHelper
sys.path.append("../../../")
from conf import Conf
from ether2any import Ether2Any
from ether2any.helper import getDstMacFromPkt, isBroadcast, binToHexStr
class TwittStreamHandler(tweepy.StreamListener):
def __init__(self, dev):
super(TwittStreamHandler, self).__init__()
self.dev = dev
self.fragments = {}
def on_status( self, status ):
print '-' * 20
print "incoming:", unicode(status.text)
print "hex:", binToHexStr(status.text), len(status.text)
# reassemble messages, put them together if nessecary.
def on_limit(self, track):
print "We got limited ", track
print "At the moment there is no error-handling for this, so we just kill everything. Remember: This software doesn't even deserve the label 'alpha' ;)"
sys.exit(1)
def on_error(self, status_code):
print "We got an error code: ", status_code
if status_code == 401:
print "Better check 'yer twitter-credentials."
sys.exit(2)
else:
print "At the moment there is no error-handling for this, so we just kill everything. Remember: This software doesn't even deserve the label 'alpha' ;)"
sys.exit(1)
def on_timeout(self, status_code):
print "Got an timeout: ", status_code
print "At the moment there is no error-handling for this, so we just kill everything. Remember: This software doesn't even deserve the label 'alpha' ;)"
class DownstreamThread(threading.Thread):
def __init__(self, dev, auth, endpoint):
threading.Thread.__init__(self)
self.auth = auth
self.endpoint = endpoint
self.dev = dev
self.daemon = True
def run(self):
stream = tweepy.Stream(auth=self.auth, listener=TwittStreamHandler(self.dev))
stream.userstream()
stream.filter(self.endpoint, None)
stream.sample()
class RFC1149(Ether2Any):
def __init__(self):
Ether2Any.__init__(self, tap=False)
network = Conf.get("network", {'mtu': 1400})
self.twitterConf = Conf.get("twitter", None)
self.endpoint = self.twitterConf['endpoint']
if not self.endpoint:
print "No endpoint in configuration, please add one."
sys.exit(1)
self.dev.ifconfig(**network)
self.dev.up()
self._setupTwitter()
self.downstream = DownstreamThread(dev=self.dev, auth=self.auth, endpoint=self.endpoint)
self.downstream.start()
def _requestTwitterTokens(self):
auth = tweepy.OAuthHandler(self._dec(self.ck), self._dec(self.cs))
pass
def _setupTwitter(self):
ck = [17, 39, 65, 39, 25, 22, 38, 30, 20, 38, 33, 69, 27, 0, 61,
31, 61, 34, 42, 32]
cs = [71, 37, 71, 37, 57, 36, 18, 2, 59, 64, 63, 58, 23, 61, 74,
30, 34, 68, 38, 33, 56, 1, 3, 74, 29, 9, 41, 32, 33, 7, 52,
8, 70, 20, 30, 25, 38, 51, 57, 66, 53, 0, 42]
self.auth = tweepy.OAuthHandler(self._dec(ck), self._dec(cs))
if not self.twitterConf['ACCESS_KEY']:
# request tokens, get access, write tokens down.
auth_url = self.auth.get_authorization_url()
print "We have no access token for a twitter account. Please visit the"
print "url printed down below, login and report back with the PIN."
print
print " Authorization URL: %s" % auth_url
print
verifier = raw_input('PIN: ').strip()
self.auth.get_access_token(verifier)
self.twitterConf['ACCESS_KEY'] = self.auth.access_token.key
self.twitterConf['ACCESS_SECRET'] = self.auth.access_token.secret
authConf = open("conf_auth.py", "w")
authConf.write("""from conf import Conf
# WARNING: This config was overwritten! If you change it be sure
# that you know, what you are doing.
if not Conf['twitter']['ACCESS_KEY']:
Conf['twitter']['ACCESS_KEY'] = "%s"
Conf['twitter']['ACCESS_SECRET'] = "%s"
""" % (self.twitterConf['ACCESS_KEY'], self.twitterConf['ACCESS_SECRET']))
authConf.close()
self.auth.set_access_token(self.twitterConf['ACCESS_KEY'], self.twitterConf['ACCESS_SECRET'])
self.api = tweepy.API(self.auth)
def _dec(self, s):
""" ... """
return "".join(map(lambda x: chr(x+48), reversed(s)))
def sendToNet(self, packet):
for subPacket in UPHelper.encode(packet):
print subPacket
if __name__ == '__main__':
rfc = RFC1149()
print "Starting RFC1149 ip-over-twitter service..."
rfc.run()

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tunnel/rfc1149/uphelper.py Normal file
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import random
import bitarray
class UPHelper():
""" The Unicode Packet Helper
Twitter supports 140 chars, while a char can be a unicode
character. For a unicode character there are 2^20 possibilities.
For the sake of lazyness we put two bytes in each character, using
only 2^16. The remaining 4 bits can be used for metadata or whatever.
The header in the metadata is as following:
<fragment bit (1 if packet is a fragment, 0 if last in row)>
<9 bits length of payload>
<32 bit random paket id>"""
@staticmethod
def intToBits(n, length):
""" Convert the number n to a bitarray of length. """
i = 0
c = 1
ret = [False] * length
while i < length:
ret[length-(i+1)] = (n & c) > 0
i += 1
c <<= 1
return ret
@staticmethod
def bitsToInt(bits):
ret = 0
for i in bits:
ret = (ret << 1) | (i and 1 or 0)
return ret
@staticmethod
def encode(data):
""" Generate list of packets with a header from data. """
packetId = random.randint(0, 2**32)
fragments = []
while len(data) > 280:
fragments.append(data[0:280])
data = data[280:]
if len(data) > 0:
fragments.append(data)
# convert to twitter message
for y in range(len(fragments)):
fragment = fragments[y]
lenX = len(fragment)
# pad packet if it is not long enouth / not aligned
if len(fragment) < 2*11:
fragment = fragment + "\x00" * (2*11-len(fragment))
if len(fragment) % 2 == 1:
fragment += "\x00"
# write header (bits: 1 fragment, 9 length, 32 id)
header = bitarray.bitarray(1)
# write fragment-bit
header[0] = (y+1 == len(fragments))
# append packet length
header.extend(UPHelper.intToBits(lenX, 9))
# add packet id
header.extend(UPHelper.intToBits(packetId, 32))
# padding to complete last 4 bytes
header.extend([False, False])
i = 0
h = 0
ret = ""
while i+1 < len(fragment):
val = ord(fragment[i]) << 8 | ord(fragment[i+1])
if h < 11:
val |= UPHelper.bitsToInt(header[h*4:(h+1)*4]) << 16
h += 1
ret += unichr(val)
i += 2
fragments[y] = ret
return fragments
@staticmethod
def decode(packet):
""" Decodes an unicodestring (packet) back to header + data
Returns: tupel(isFragmented, packetLen, packetId, data) """
if len(packet) < 11:
raise ValueError("This is not a valid packet, header is too short (should be at least 11, is %d)" % len(packet))
header = bitarray.bitarray()
for i in range(11):
header.extend("{:04b}".format(ord(packet[i]) >> 16))
isFragmented = header[0]
packetLen = UPHelper.bitsToInt(header[1:9])
packetId = UPHelper.bitsToInt(header[9:])
rawData = map(lambda x: ord(x) & 0xFFFF, packet)
data = []
for p in rawData:
data.append(chr(p >> 8))
data.append(chr(p & 255))
data = "".join(data)
return (isFragmented, packetLen, packetId, data)
if __name__ == '__main__':
print UPHelper.encode("foo")
print UPHelper.decode(UPHelper.encode("foo")[0])
msg = "".join([chr(i) for i in range(256)])
msg += "".join([chr(i) for i in range(256)])
p = UPHelper.encode(msg)
print repr(msg)
for x in p:
print UPHelper.decode(x)