Nothing much, just a script to walk the tree for a given name. It starts at a CNAME and walks its way all the way down to the A record and IP address. In the context of larger script that attempted to connect to a given URL, we used this to troubleshoot incompatibilities between firewall timeout and DNS timeout settings.<\/p>\n
\r\n#!\/usr\/bin\/env python\r\n\r\nimport dns.resolver, sys\r\nhostname = sys.argv[1]\r\nprint \"issuing recursive name lookup (simulates dig)...\"\r\nn=hostname\r\ntry:\r\n while True:\r\n for rdata in dns.resolver.query(n, 'CNAME') :\r\n print rdata\r\n n=rdata.target\r\nexcept:\r\n for rdata in dns.resolver.query(n) :\r\n print rdata\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"Nothing much, just a script to walk the tree for a given name. It starts at a CNAME and walks its way all the way down to the A record and IP address. In the context of larger script that…<\/p>\n