* Track MAC addresses in the client cache (when we can find them); so if we have an expired cache entry, but the MAC hasn't changed, we can assume the original ID is still valid.

getifaddr.h

@@ -6,6 +6,7 @@
 
 #ifndef __GETIFADDR_H__
 #define __GETIFADDR_H__
+#include <arpa/inet.h>
 
 /* getifaddr()
  * take a network interface name and write the
@@ -20,5 +21,8 @@ getsysaddr(char * buf, int len);
 int
 getifhwaddr(const char * ifname, char * buf, int len);
 
+int
+get_remote_mac(struct in_addr ip_addr, unsigned char * mac);
+
 #endif