Add additional example found in Eric's document SupportingWDNS - Fars…

examples/nmsg_nxdomain.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python 
+
+# Written by Eric Ziegast
+# nxdomain.py - look at ch202 dnsqr data from a file and print out any 
+# qname / type / rcode for data that's not rcode 0 ("NOERROR"). 
+# Forgive awkward key processing. Sometimes an rcode or qtype key 
+# doesn't exist and would cause the script to break if accessed them.
+
+
+import nmsg
+import wdns
+import sys
+
+def main(fname):
+	i = nmsg.input.open_file(fname)
+	while True:
+		m = i.read() 
+		if not m:
+			break
+		rcode = 0
+		qname = qtype = 0
+		for key in m.keys():
+			if key == 'rcode':
+				rcode = m[key] 
+				continue
+			if key == 'qname':
+				qname = m[key]
+				continue
+			if key == 'qtype':
+				qtype = m[key]
+				continue
+			if rcode != 0 and qname != 0 and qtype != 0:
+				print('%s %s %s' % (wdns.rcode_to_str(rcode),
+				wdns.rrtype_to_str(qtype), wdns.domain_to_str(qname)))
+
+if __name__ == '__main__':
+	main(sys.argv[1])