Copy registered machines from a LinkSys router to a hosts file, by scraping a router web page

host_updater.py

import urllib2
import base64
import re

request = urllib2.Request("http://192.168.1.1/DHCPTable.asp")
base64string = base64.encodestring('%s:%s' % (USER, PASSWORD)).replace('\n', '')
request.add_header("Authorization", "Basic %s" % base64string)

lines = (re.findall(r"'(.*?)'", x, re.DOTALL) for x in urllib2.urlopen(request) if 'new AAA' in x)
q = dict((vv[0], vv[1]) for vv in lines if vv)

def is_match(line, q):
    for host in q.values():
        if line.startswith(host):
            return True
    return False

with open('C:\WINDOWS\system32\drivers\etc\hosts') as f:
    host_lines = [line.strip() for line in f if not is_match(line, q)]

host_lines += ["%s %s" % (v,k) for k,v in q.iteritems()]
for vvv in host_lines:
    print vvv
    
with open('C:\WINDOWS\system32\drivers\etc\hosts', 'w') as fw:
    for line in host_lines:
        fw.write(line + "\n")