proxy.sh

	#!/bin/bash
	
	# proxy_add=https://proxy61.iitd.ac.in/cgi-bin/proxy.cgi
	#For mtech
	proxy_add=https://proxy62.iitd.ac.in/cgi-bin/proxy.cgi
	#FILL THIS 
	username="";
	password="";

	unsetProxy()
	{
		unset http_proxy
		unset https_proxy
		unset ftp_proxy
	}

	getsessionid()
	{
		session_id=`curl $proxy_add -s -k --no-progress-bar --connect-timeout 15| grep -m 1 sessionid[\"=[:alpha:]\ ]*[[:digit:]]* | grep -oh "\"[[:digit:]][[:alnum:]]*\"" | sed 's|"||' | sed 's|"||' `
		#echo "Session ID: $session_id"
	}

	logout()
	{
		curl -d "sessionid=$session_id&action=logout" $proxy_add -k -s >/dev/null
		if [ ${#ifAlreadyLoggedIn} = 0 ]; then
				echo -e "Enjoy!"
		else
				echo -e "proxy logout!!" ;
		fi

		exit 0
	}

	login()
	{
		logintext=`curl -d "sessionid=$session_id&action=Validate&userid=$username&pass=$password" $proxy_add -k -s`
		#echo $logintext
		ifAlreadyLoggedIn=`echo $logintext | grep -v "already logged in"`
		if [ ${#ifAlreadyLoggedIn} = 0 ]; then
				echo "Already logged in"
				exit 0
		fi
	}

	#trap logout SIGINT

	retries=1000
	islogout=1;

	mainloop()
	{
		unsetProxy
		getsessionid
		login
		iflogin=`echo $logintext | grep "logged in successfully"`
		if [ ${#iflogin} = 0 ] ;then
			echo "error in login"
			sleep 10
			mainloop
		else
			echo "proxy login "
			while true; do
				sleep 120
				refreshtext=`curl -d "sessionid=$session_id&action=Refresh" $proxy_add -k -s`
				ifrefresh=`echo $refreshtext | grep "logged in successfully"`
				if [ ${#ifrefresh} = 0 ] ;
					then
					curl -d "sessionid=$session_id&action=logout" $proxy_add -k -s >/dev/null
					mainloop
				fi
			done
		fi
	}

	trap logout EXIT
	mainloop