1.
Python for Ethical Hackers
Mohammad reza Kamalifard
Kamalifard@datasec.ir

2.
Python Language Essentials
Module 3 : Network Security
Part 2 :
SocketServer Framework
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

3.
Python Language Essentials
Module 3 : Network Security
Part 2 :
SocketServer Framework
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

4.
Client side
import socket
import sys
if len(sys.argv) < 3 :
print 'Please Enter address and port'
exit()
tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tcp_socket.connect((sys.argv[1], int(sys.argv[2])))
while True:
userInput = raw_input('Please Enter a Message! : ')
tcp_socket.send(userInput)
print 'Server Send back : ' + str(tcp_socket.recv(2048))
tcp_socket.close()
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

5.
-----Client-----
python client.py 127.0.0.1 8000
Please Enter a Message! : Salam
Server Send back : Salam
Please Enter a Message! : WELCOME TO PYSEC101!
Server Send back : WELCOME TO PYSEC101!
Please Enter a Message! :
-----Server-----
Waiting for client ...
Revived connection from : 127.0.0.1
Starting ECHO output...
Client send : Salam
Client send : WELCOME TO PYSEC101!
Client send :
Closing Connection
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

6.
SocketServer Framework
Framework in Python to create TCP and UDP servers
Does all the basic steps for you in the background
Comes in handy if you want to create a server to lure a client and
analyze its behavior
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

7.
SocketServer Framework
Has to be Subclass of BaseRequestHandler
Override handle() to process request
Call handle_request or server_forever to process clients
For TCP Servers
self.request is the client socket
self.client_addresss is the client details
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

8.
import SocketServer
class EchoHandler(SocketServer.BaseRequestHandler):
def handle(self):
print 'Got Connection from : ', self.client_address
data = 'dummy'
while len(data):
data = self.request.recv(1024)
print 'Client sent :' + data
self.request.send(data)
print 'client left'
server_address = ('127.0.0.1', 9050)
server = SocketServer.TCPServer(server_address, EchoHandler)
server.serve_forever()
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

9.
Exercise
is this server multi_threaded ?
code up the multi_threaded version of the SocketServer
Mohammad reza Kamalifard
Kamalifard.ir/pysec101

10.
This work is licensed under the Creative Commons
Attribution-NoDerivs 3.0 Unported License.
To view a copy of this license, visit http://creativecommons.org/licenses/by-nd/3.0/
Copyright 2013 Mohammad reza Kamalifard.
All rights reserved.