Dynamic IP update:

Using BCKA (Extended OBP KeepAlives):

When an authenticated keepalive is received from a different IP but
on the same port, we update the IP for the OpenBridge. This means, we can
handle dynamic IP seamlessly!

config.py

@@ -302,7 +302,7 @@ def build_config(_config_file):
                         'SUB_ACL': config.get(section, 'SUB_ACL'),
                         'TG1_ACL': config.get(section, 'TGID_ACL'),
                         'TG2_ACL': 'PERMIT:ALL',
-                        'RELAX_CHECKS': config.getboolean(section, 'RELAX_CHECKS')
+                        'RELAX_CHECKS': config.getboolean(section, 'RELAX_CHECKS'),
                         'ENHANCED_OBP': config.getboolean(section, 'ENHANCED_OBP')
                     }})
                     

hblink.py

@@ -213,12 +213,20 @@ class OPENBRIDGE(DatagramProtocol):
                     _hash = _packet[4:]
                     _ckhs = hmac_new(self._config['PASSPHRASE'],_packet[:4],sha1).digest()
                     if compare_digest(_hash, _ckhs):
-                        logger.debug('(%s) Bridge Control Keep Alive received',self._system)
+                        logger.debug('(%s) *BridgeControl* Keep Alive received',self._system)
                         self._config['_bcka'] = time()
-            
+                        if _sockaddr != self._config['TARGET_SOCK']:
+                            h,p =  _sockaddr
+                            if p == self._config['TARGET_PORT']:
+                                self._config['TARGET_SOCK'] = _sockaddr
+                                self.config['TARGET_IP'] = h
+                                logger.info('(%s) *BridgeControl* Source IP has changed for OBP, updating',self._system)
+                            else:
+                                logger.info('(%s) *BridgeControl* Source IP has changed for OBP but port has also changed, *NOT* updating',self._system)
+                                
                     else:
                         h,p = _sockaddr
-                        logger.info('(%s) OpenBridge BCKA invalid KeepAlive, packet discarded - OPCODE: %s DATA: %s HMAC LENGTH: %s HMAC: %s SRC IP: %s SRC PORT: %s', self._system, _packet[:4], repr(_packet[:53]), len(_packet[53:]), repr(_packet[53:]),h,p) 
+                        logger.info('(%s) *BridgeControl* BCKA invalid KeepAlive, packet discarded - OPCODE: %s DATA: %s HMAC LENGTH: %s HMAC: %s SRC IP: %s SRC PORT: %s', self._system, _packet[:4], repr(_packet[:53]), len(_packet[53:]), repr(_packet[53:]),h,p) 
         
                 
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