#af_net

[sniper930-blog]

Socket Programming Basics

-----------------------------------------------[Python]------------------------------------------------

>>> import socket

>>> tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

>>> tcpSocket.bind((“0.0.0.0”, 8000))

>>> tcpSocket.listen(2)

>>> (client, (ip, port)) = tcpSocket.accept()

---------------------------------------------[Terminal]-----------------------------------------------

root@TheLaughingMan:~# ncat 192.168.1.150 8000

-----------------------------------------------[Python]------------------------------------------------

>>> client

<socket._socketobject object at 0xb74f6e9c>

>>> ip

‘192.168.1.10’

>>> port

1031

>>> client.send(“Give me six hours to chop down a tree and I will spend the first four sharpening the axe.\n”)

89

>>> data = client.recv(2048)

---------------------------------------------[Terminal]-----------------------------------------------

Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

Brilliant!

-----------------------------------------------[Python]------------------------------------------------

>>> data

‘Brilliant!\n’

-----------------------------------------------------------------------------------------------------------

---------------------------------------[Save as Server.py]----------------------------------------

import socket

tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

tcpSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

tcpSocket.bind((“0.0.0.0”, 8000))

tcpSocket.listen(2)

print “Waiting for a Client ... ”

(client, (ip, sock)) = tcpSocket.accept()

print “Received connection from : ”, ip

print “Starting ECHO output .... ”

data = ‘dummy’

while len(data):

data = client.recv(2048)

print “Client sent: ”, data

client.send(data)

print “Closing connection ...”

client.close()

print “Shutting down server ...”

--------------------------------------------[Terminal1]-----------------------------------------------

root@TheLaughingMan:~# python Server.py

Waiting for a Client ...

--------------------------------------------[Terminal2]-----------------------------------------------

root@ThePuppeteer:~# ncat –nv 192.168.1.150 8000

Ncat Version 6.47 ( http://nmap.org/ncat )

Ncat: Connected to 192.168.1.150:8000.

--------------------------------------------[Terminal1]-----------------------------------------------

Received connection from : 192.168.1.10

Starting ECHO output ....

--------------------------------------------[Terminal2]-----------------------------------------------

Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

--------------------------------------------[Terminal1]-----------------------------------------------

Client sent: Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

-----------------------------------------------------------------------------------------------------------

·        Create a simple Echo Server to handle 1 client

·        Create a Multi-Threaded Echo Server

·        Create a Multi-Process Echo Server

·        Create a Non-Blocking Multiplexed Echo Server using Select()