verify: allow cdnlist to override nxdomain (some domains have false nxdomain...

verify: allow cdnlist to override nxdomain (some domains have false nxdomain reports on bare domain)

cdn-testlist.txt

@@ -2,4 +2,7 @@ www.azure.cn.mschcdn.com
 www.gov.cn
 a1.cdn-hotels.com
 cdn.jsdelivr.net
-edge.yunjiasu.com
\ No newline at end of file
+edge.yunjiasu.com
+www.travelsky.net
+www.xiumu.org
+www.igoldhk.com
\ No newline at end of file

verify.py

@@ -89,10 +89,11 @@ class ChinaListVerify(object):
 
     def check_domain(self, domain):
         nameservers = []
+        nxdomain = False
         try:
             answers = dns.resolver.query(domain, 'NS')
         except dns.resolver.NXDOMAIN:
-            raise NXDOMAIN
+            nxdomain = True
         except:
             pass
         else:   
@@ -111,6 +112,9 @@ class ChinaListVerify(object):
             if testdomain.endswith(domain):
                 self.check_cdnlist(testdomain)
 
+        if nxdomain:
+            raise NXDOMAIN
+
         self.check_blacklist(nameservers)
 
         for nameserver in nameservers: