+int sockaddrcmp(const struct sockaddr *a,
+ const struct sockaddr *b);
+
+int multicast(const struct sockaddr *sa);
+char *format_sockaddr(const struct sockaddr *sa);
+
+int netaddress_parse(struct netaddress *na,
+ int nvec,
+ char **vec);
+void netaddress_format(const struct netaddress *na,
+ int *nvecp,
+ char ***vecp);
+struct addrinfo *netaddress_resolve(const struct netaddress *na,
+ int passive,
+ int protocol);