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turnServer.py
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turnServer.py
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import os
import Queue
import signal
import socket
import sys
import time
from threading import Thread
from network.message import Message
from network.sock import Socket
from utils import constants
from utils import errors
from utils import exceptions
from utils import utils
# Dict to store connected clients in
nickMap = {}
# Dict for new clients that haven't registered a nick yet
ipMap = {}
class TURNServer(object):
def __init__(self, listenPort):
self.listenPort = listenPort
def start(self):
global logFile
try:
logFile = open('cryptully.log', 'a')
except:
logFile = None
print "Error opening logfile"
Console().start()
serversock = self.startServer()
while True:
# Wait for a client to connect
#print "Waiting for client..."
(clientSock, clientAddr) = serversock.accept()
# Wrap the socket in our socket object
clientSock = Socket(clientAddr, clientSock)
# Store the client's IP and port in the IP map
printAndLog("Got connection: " + str(clientSock))
ipMap[str(clientSock)] = Client(clientSock)
def startServer(self):
printAndLog("Starting server...")
serversock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
serversock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
serversock.bind(('0.0.0.0', self.listenPort))
serversock.listen(10)
return serversock
except exceptions.NetworkError as ne:
printAndLog("Failed to start server")
sys.exit(1)
def stop(self):
printAndLog("Requested to stop server")
for nick, client in nickMap.iteritems():
client.send(Message(serverCommand=constants.COMMAND_END, destNick=nick, error=errors.ERR_SERVER_SHUTDOWN))
# Give the send threads time to get their messages out
time.sleep(.25)
if logFile is not None:
logFile.close()
class Console(Thread):
def __init__(self):
Thread.__init__(self)
self.daemon = True
def run(self):
while True:
input = raw_input(">> ").split()
if len(input) == 0:
continue
command = input[0]
if command == 'list' or command == 'nicks':
print "Registered nicks"
print "================"
for nick, client in nickMap.iteritems():
print nick + " - " + str(client.sock)
elif command == 'zombies':
print "Zombie Connections"
print "=================="
for addr, client in ipMap.iteritems():
print addr
elif command == 'kick':
if len(input) != 2:
print "Kick command requires an argument"
else:
try:
client = nickMap[input[1]]
client.kick()
print input[1] + " kicked from server"
except KeyError:
print input[1] + " is not a registered nick"
elif command == 'kill':
if len(input) != 2:
print "Kill command requires an argument"
else:
try:
client = ipMap[input[1]]
client.kick()
print input[1] + " killed"
except KeyError:
print input[1] + " is not a zombie"
elif command == 'stop':
os.kill(os.getpid(), signal.SIGINT)
else:
print "Unrecognized command"
class Client(object):
def __init__(self, sock):
self.sock = sock
self.nick = None
self.sendThread = SendThread(sock)
self.recvThread = RecvThread(sock, self.__nickRegistered)
self.sendThread.start()
self.recvThread.start()
def send(self, message):
self.sendThread.queue.put(message)
def __nickRegistered(self, nick):
# Add the client to the nick map and remove it from the ip map
printAndLog(str(self.sock) + " -> " + nick)
self.nick = nick
nickMap[nick] = self
del ipMap[str(self.sock)]
def disconnect(self):
self.sock.disconnect()
del nickMap[self.nick]
def kick(self):
self.send(Message(serverCommand=constants.COMMAND_ERR, destNick=self.nick, error=errors.ERR_KICKED))
time.sleep(.25)
self.disconnect()
class SendThread(Thread):
def __init__(self, sock):
Thread.__init__(self)
self.daemon = True
self.sock = sock
self.queue = Queue.Queue()
def run(self):
while True:
message = self.queue.get()
try:
self.sock.send(str(message))
except Exception as e:
nick = message.destNick
printAndLog(nick + ": error sending data to: " + str(e))
nickMap[nick].disconnect()
return
finally:
self.queue.task_done()
class RecvThread(Thread):
def __init__(self, sock, nickRegisteredCallback):
Thread.__init__(self)
self.daemon = True
self.sock = sock
self.nickRegisteredCallback = nickRegisteredCallback
def run(self):
# The first communcation with the client is registering a nick
message = Message.createFromJSON(self.sock.recv())
# Check that the client sent the register command
if message.serverCommand != constants.COMMAND_REGISTER:
printAndLog(str(self.sock) + ": did not register a nick")
self.__handleError(errors.ERR_INVALID_COMMAND)
return
# Check that the nick is valid
self.nick = message.sourceNick
if utils.isValidNick(self.nick) != errors.VALID_NICK:
printAndLog(str(self.sock) + ": tried to register an invalid nick")
self.__handleError(errors.ERR_INVALID_NICK)
return
# Check that the nick is not already in use
self.nick = self.nick.lower()
if self.nick in nickMap:
printAndLog(str(self.sock) + ": tried to register an in-use nick")
self.__handleError(errors.ERR_NICK_IN_USE)
return
self.nickRegisteredCallback(self.nick)
while True:
try:
message = Message.createFromJSON(self.sock.recv())
if message.serverCommand == constants.COMMAND_END:
printAndLog(self.nick + ": requested to end connection")
nickMap[self.nick].disconnect()
return
elif message.serverCommand != constants.COMMAND_RELAY:
printAndLog(self.nick + ": sent invalid command")
self.__handleError(errors.ERR_INVALID_COMMAND)
return
try:
destNick = message.destNick
# Validate the destination nick
if utils.isValidNick(destNick) != errors.VALID_NICK:
printAndLog(self.nick + ": requested to send message to invalid nick")
self.__handleError(errors.ERR_INVALID_NICK)
client = nickMap[destNick.lower()]
# Rewrite the source nick to prevent nick spoofing
message.sourceNick = self.nick
client.send(message)
except KeyError:
printAndLog(self.nick + ": sent message to non-existant nick")
self.sock.send(str(Message(serverCommand=constants.COMMAND_ERR, destNick=message.destNick, error=errors.ERR_NICK_NOT_FOUND)))
except Exception as e:
if hasattr(e, 'errno') and e.errno != errors.ERR_CLOSED_CONNECTION:
printAndLog(self.nick + ": error receiving from: " + str(e))
if self.nick in nickMap:
nickMap[self.nick].disconnect()
return
def __handleError(self, errorCode):
self.sock.send(str(Message(serverCommand=constants.COMMAND_ERR, error=errorCode)))
self.sock.disconnect()
# Remove the client from the ip or nick maps (it may be in either)
try:
del ipMap[str(self.sock)]
# If found the ip map, don't try to delete from the nick map (it can't be in both)
return
except:
pass
try:
del nickMap[self.nick]
except:
pass
def printAndLog(message):
sys.stdout.write("\b\b\b" + message + "\n>> ")
sys.stdout.flush()
log(message)
def log(message):
if logFile is not None:
logFile.write(message + '\n')
logFile.flush()