import subprocess

good_dns = []
with open('/home/qs/utils/massdns/lists/public-dns.resolvers') as f:
	servers = f.read().splitlines()
	i = 0
	for dns in servers:
		# print 'server:'+dns
		res = '1'
		try:
			res = subprocess.check_output(["dig", "+short", "@"+dns,"googleewewwewewewewe.com"],  timeout=1)
			# print (res)
		except Exception as e:
			print (dns +"\t\t" +str(e))
			continue
		# print (res)
		if res == b'':
			good_dns.append(dns)
			print (dns)
	print (good_dns)
	with open('/tmp/good_dns.txt', mode='wt', encoding='utf-8') as myfile:
		myfile.write('\n'.join(good_dns))