From bfebb87e3ed64481485bbe321bbf1856e4985d08 Mon Sep 17 00:00:00 2001
From: Stefan Reiter <stefan.reiter@studierende.htl-donaustadt.at>
Date: Tue, 10 Jan 2017 18:07:59 +0100
Subject: [PATCH] Initial commit

---
 README     |  39 ++++++++++++++++
 teletun.py | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 170 insertions(+)
 create mode 100644 README
 create mode 100755 teletun.py

diff --git a/README b/README
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--- /dev/null
+++ b/README
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+# Teletun - IP over Telegram
+
+Have you ever wanted to transfer IP traffic over an instant messenger? Wanted to test the capabilities of Telegram?
+
+What do you mean by "no", of course you have! So here you go, take it and *have fun*!
+
+# Install instructions
+
+Install the [telegram-cli](https://github.com/vysheng/tg) package (using snap for example).
+
+Run an instance of telegram-cli using the following line:
+
+```
+telegram-cli --json -P 4458
+```
+
+(Make sure that `-P` is capital, half an hour of debugging was wasted on that already)
+
+Install dependencies:
+
+```
+pip install python-pytun pytg
+```
+
+Download the python script. Run the python script. Pray to the gods for mercy.
+
+# Performance
+
+Not that it really matters (you didn't think you're going to use this in anything serious, did you?), but actually, performance is not too bad.
+
+Bandwidth is quite limited of course, but you can get a Ping as low as 100-150 ms. I guess they didn't lie when they called it *Instant* Messenger.
+
+# MIT License
+
+(C) Stefan Reiter 2017
+
+Full license text can be found in the file called LICENSE in this Repositories root.
+
+But please do me the favor and don't ever use this thing. It's quite horrible.
diff --git a/teletun.py b/teletun.py
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+++ b/teletun.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+
+from pytun import TunTapDevice
+from pytg.sender import Sender
+from pytg.receiver import Receiver
+from pytg.utils import coroutine
+import base64
+import threading
+import sys
+import traceback
+import os
+import signal
+import psutil
+
+
+print 'Connecting to telegram...'
+
+receiver = Receiver(host="localhost", port=4458)
+sender = Sender(host="localhost", port=4458)
+
+contacts = {}
+
+counter = 0
+for c in sender.dialog_list():
+    counter += 1
+    contacts[counter] = c
+    print unicode(counter) + ': \t' + unicode(c['print_name'])
+
+i = input('Telegram online, please enter contact to connect to (by number): ')
+
+if i not in contacts:
+    print 'Please enter a number in the above range!'
+    exit(1)
+
+
+username = unicode(contacts[i]['print_name'])
+print 'Connecting to partner: ' + username
+
+
+tun = TunTapDevice(name='teletun-device')
+
+print tun.name + ' has been created, information follows:'
+
+
+if '--server' in sys.argv:
+    tun.addr = '10.8.0.1'
+    tun.dstaddr = '10.8.0.2'
+else:
+    tun.addr = '10.8.0.2'
+    tun.dstaddr = '10.8.0.1'
+
+tun.netmask = '255.255.255.0'
+tun.mtu = 1500
+
+print 'Address: ' + tun.addr
+print 'Dest.-Address: ' + tun.dstaddr
+print 'Netmask: ' + tun.netmask
+print 'MTU: ' + str(tun.mtu)
+
+tun.up()
+up = True
+
+
+def main_loop_starter():
+    pass
+    receiver.start()
+    receiver.message(main_loop())
+
+
+@coroutine
+def main_loop():
+    global up
+    try:
+        while up:
+            msg = (yield)
+            if msg is not None and msg['event'] == unicode('message') and not msg['own']:
+                try:
+                    data = base64.b64decode(msg.text)
+                    tun.write(data)
+                except:
+                    print msg.text
+    except:
+        exc_type, exc_value, exc_traceback = sys.exc_info()
+        lines = traceback.format_exception(exc_type, exc_value, exc_traceback)
+        print ''.join('!! ' + line for line in lines)
+        print 'Receiver stopped'
+
+
+print 'TUN is up'
+
+
+thread = threading.Thread(target=main_loop_starter)
+
+try:
+
+    print 'Connecting to peer...'
+    thread.start()
+    print 'Connected! Sending Invitation!'
+
+    sender.msg(username, unicode('Hello, I would like to establish a Layer 3 Tunnel with you! -teletun'))
+
+    while True:
+        buf = tun.read(tun.mtu)
+        sender.msg(username, unicode(base64.b64encode(buf)))
+
+except:
+    exc_type, exc_value, exc_traceback = sys.exc_info()
+    lines = traceback.format_exception(exc_type, exc_value, exc_traceback)
+    print ''.join('!! ' + line for line in lines)
+    print 'Exiting...'
+
+up = False
+tun.down()
+
+receiver.stop()
+
+print 'Bye bye!'
+
+
+# Literally Overkill
+
+current_process = psutil.Process()
+children = current_process.children(recursive=True)
+for child in children:
+    os.kill(child.pid, signal.SIGKILL)
+
+children = current_process.children(recursive=True)
+for child in children:
+    os.kill(child.pid, signal.SIGKILL)
+
+os.kill(current_process.pid, signal.SIGKILL)