#!usr/bin/python

import httplib, socket, time, re, os, sys, datetime

# Hello world!
os.system('clear')
print "==================================================="
print "== Webserverwatcher.py | www.ethicalhack3r.co.uk =="
print "==================================================="
print
url = raw_input("Enter the URL you want to keep an eye on: ")

# Check URL
http = "http://"

if http in url:
	print
	print "ERROR! Remove http:// from the URL."
	url = raw_input("Enter the URL you want to keep an eye on: ")

count = 0

while 1:

	# Count how many times the script has run
	count = count + 1

	# Get todays date/time
	getdate = datetime.datetime.today()
	today = getdate.strftime("%d/%m/%Y %H:%M:%S") 

	# Get webserver IP
	socket.setdefaulttimeout(15)

	try: socket.gethostbyname(url)
	except socket.error:
		os.system('clear')
		print "==================================================="
		print "== Webserverwatcher.py | www.ethicalhack3r.co.uk =="
		print "==================================================="
		print
		print "SOCKET ERROR! 1)Check the URL 2)Check your internet connection 3)Try again."
		print
		sys.exit()

	# HTTP HEAD request
	conn = httplib.HTTPConnection(url, 80)

	try: conn.request("HEAD", "/")
	except socket.timeout:
		print "Webserver has timed out. Check URL and internet connection."

	# Read HTTP response
	res = conn.getresponse()

	# Close HTTP connection
	conn.close()

	# Turn headers into variables
	ip = socket.gethostbyname(url)
	server = res.getheader('Server')
	xpoweredby = res.getheader('x-powered-by')
	date = res.getheader('date')

	# Print some output
	os.system('clear')
	print "==================================================="
	print "== Webserverwatcher.py | www.ethicalhack3r.co.uk =="
	print "==================================================="
	print
	print res.status, res.reason
	print

	if xpoweredby == None:
		print ip + " " + server + " " + date
	else:
		print ip + " " + server + " " + xpoweredby + " " + date

	print
	print "The script has run", count, "time/s."
	
	if (count < 2):
	
		# Save header data to log file
		outfile = file('log.txt', 'w')
		outfile.write("Started on " + today + "\n")
		outfile.write(ip + " ")
		outfile.write(server + " ")
		
		# Check if xpoweredby header exists, if it does save to log
		if xpoweredby != None:
			outfile.write(xpoweredby + " ")
			outfile.write(date + "\n")
			outfile.close()
		else:
			outfile.write(date + "\n")
			outfile.close()

		# Print some output
		print
		print "Logged!"
		print
	else:

		# Read file to compare old/new headers
		readfile = open('log.txt', "r")
		text = readfile.read()

		# Check if log file IP is same as new IP
		if ip not in text:
			outfile = file('log.txt', 'a')
			outfile.write('IP address has been changed! New IP is ' + ip + ' ' + date + '\n')
			outfile.close()

		# Check if log file server is same as new server
		if server not in text: 
			outfile = file('log.txt', 'a')
			outfile.write('Web Server software has been changed! New server is ' + server + ' ' + date + '\n')
			outfile.close()

		# Check if log file x-powered-by header is same as new one
		if xpoweredby != None and xpoweredby not in text:
			outfile = file('log.txt', 'a')
			outfile.write('X-powered-by header has been changed! New header is ' + xpoweredby + ' ' + date + '\n')
			outfile.close()
	
	# Time to wait between HTTP requests (3600 seconds = 1hr)
	try: time.sleep(3600)
	except KeyboardInterrupt:
			outfile = file('log.txt', 'a')
			outfile.write("Finished on " + today)
			outfile.close()
			print
			print "Check log.txt."
			print
			sys.exit()