-extern int str2opt(const char *);
-extern char *opt2str(int);
-extern int send_packet(ip_t, vpn_packet_t *);
+extern void send_packet(struct node_t *, vpn_packet_t *);
+extern void receive_packet(struct node_t *, vpn_packet_t *);
+extern void receive_tcppacket(struct connection_t *, char *, int);
+extern void broadcast_packet(struct node_t *, vpn_packet_t *);