#!/usr/bin/env python  
#coding=utf-8
#  
# Generate a list of dnsmasq rules with ipset for gfwlist
#  
# Copyright (C) 2014 http://www.shuyz.com   
# Ref https://code.google.com/p/autoproxy-gfwlist/wiki/Rules    
 
import sys
import urllib2 
import re
import os
import datetime
import base64
#import shutil
 
#mydnsip = '127.0.0.1'
#mydnsport = '1053'

if len(sys.argv) != 2:
    print("fwlist.py outfile.txt")
    sys.exit(-1)

outfile = sys.argv[1]
 
# the url of gfwlist
baseurl = 'https://raw.githubusercontent.com/gfwlist/gfwlist/master/gfwlist.txt'
# baseurl = 'https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt'
# match comments/title/whitelist/ip address
comment_pattern = '^\!|\[|^@@|^\d+\.\d+\.\d+\.\d+'
domain_pattern = '([\w\-\_]+\.[\w\.\-\_]+)[\/\*]*' 
tmpfile = '/tmp/gfwlisttmp'
# do not write to router internal flash directly
#outfile = '/tmp/gfwlist.conf'
#rulesfile = '/etc/dnsmasq.d/gfwlist.conf'
 
fs =  file(outfile, 'w')
#fs.write('# gfw list ipset rules for dnsmasq\n')
#fs.write('# updated on ' + datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S") + '\n')
#fs.write('#\n')
 
print 'fetching list...'
content = urllib2.urlopen(baseurl, timeout=15).read().decode('base64')
 
# write the decoded content to file then read line by line
tfs = open(tmpfile, 'w')
tfs.write(content)
tfs.close()
tfs = open(tmpfile, 'r')
 
print 'page content fetched, analysis...'
 
# remember all blocked domains, in case of duplicate records
domainlist = []
 
for line in tfs.readlines():	
	if re.findall(comment_pattern, line):
		#print 'this is a comment line: ' + line
		#fs.write('#' + line)
                pass
	else:
		domain = re.findall(domain_pattern, line)
		if domain:
			try:
				found = domainlist.index(domain[0])
				#print domain[0] + ' exists.'
			except ValueError:
				#print 'saving ' + domain[0]
				domainlist.append(domain[0])
				#fs.write('server=/.%s/%s#%s\n'%(domain[0],mydnsip,mydnsport))
				#fs.write('ipset=/.%s/gfwlist\n'%domain[0])
				fs.write('%s\n'%domain[0])
		else:
			#print 'no valid domain in this line: ' + line
                        pass
					
tfs.close()	
fs.close();
 
#print 'moving generated file to dnsmasg directory'
#print outfile
#shutil.move(outfile, rulesfile)
 
#print 'restart dnsmasq...'
#print os.popen('/etc/init.d/dnsmasq restart').read()
 
print 'saving to file: ', outfile
print 'done!'