Initial release

dnsupdate.py

@@ -0,0 +1,51 @@
+import dns.query
+import dns.tsigkeyring
+import dns.update
+import re
+import string
+import sys
+
+domain = "lubcke.se"
+keyname = "lubcke.se."
+keysecret = "ZGhNJ05b8ThmHOXhJvkvMw=="
+
+# Updates a dns-record
+
+def update():
+  # Get command line args
+  if len(sys.argv) != 3:
+    print "Usage: dnsupdate.py hostname 192.168.0.1"
+    return 
+
+  hostname = sys.argv[1]
+  ipaddress = sys.argv[2]
+  
+  # Sanity check incoming data
+  hostname = string.replace(hostname, "."+domain, '')
+  if not re.search('^[12]?[0-9]?[0-9](\.[12]?[0-9]?[0-9]){3}$', ipaddress):
+    print "Invalid ip address '%s'" % ipaddress
+    return
+  
+
+  # The name of the key and the secret
+  keyring = dns.tsigkeyring.from_text({
+      keyname: keysecret
+  })
+
+  # dns.update.Update(name of domain, keyring, keyname)
+  update = dns.update.Update(domain, keyring=keyring, keyname=keyname)
+
+  # update.replace(hostname, ttl, record-type, new ip)
+  update.replace(hostname, 60, 'a', ipaddress)
+
+  # doit, servername
+  response = dns.query.tcp(update, 'nic.wahlberg.se')
+  
+  # Verify response
+  if response.rcode() == 0:
+    print "Host '%s.%s' has been added with ip address %s" % (hostname, domain, ipaddress)
+  else:
+    print "An error has occurred, the server returned:\n%s" % response
+
+if __name__=="__main__":
+  update()