Capture signals from dnsmasq and use them to update network state.

bin/dhcpleasor.py

@@ -0,0 +1,68 @@
+#!/opt/local/bin/python
+
+# Copyright [2010] [Anso Labs, LLC]
+# 
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+# 
+#        http://www.apache.org/licenses/LICENSE-2.0
+# 
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+"""
+dhcpleasor.py
+
+Handle lease database updates from DHCP servers.
+"""
+
+import sys
+import os
+import logging
+sys.path.append(os.path.abspath(os.path.join(__file__, "../../")))
+
+logging.debug(sys.path)
+import getopt
+from os import environ
+from nova.compute import network
+from nova import flags
+FLAGS = flags.FLAGS
+
+
+def add_lease(mac, ip, hostname, interface):
+    pass
+
+def old_lease(mac, ip, hostname, interface):
+    pass
+    
+def del_lease(mac, ip, hostname, interface):
+    # TODO - get net from interface instead
+    net = network.get_network_by_address(ip)
+    net.release_ip(ip)    
+    
+def init_leases(interface):
+    return ""
+
+
+def main(argv=None):
+    if argv is None:
+        argv = sys.argv
+    interface = environ.get('DNSMASQ_INTERFACE', 'br0')
+    old_redis_db = FLAGS.redis_db
+    FLAGS.redis_db = int(environ.get('REDIS_DB', '0'))
+    action = argv[1]
+    if action in ['add','del','old']:
+        mac = argv[2]
+        ip = argv[3]
+        hostname = argv[4]
+        logging.debug("Called %s for mac %s with ip %s and hostname %s on interface %s" % (action, mac, ip, hostname, interface))
+        globals()[action+'_lease'](mac, ip, hostname, interface)
+    else:
+        print init_leases(interface)
+    FLAGS.redis_db = old_redis_db
+
+if __name__ == "__main__":
+    sys.exit(main())