+
+static inline int multicast4(const struct sockaddr_in *sin) {
+ return IN_MULTICAST(ntohl(sin->sin_addr.s_addr));
+}
+
+static inline int multicast6(const struct sockaddr_in6 *sin6) {
+ return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
+}
+
+/** @brief Return true if @p sa represents a multicast address */
+int multicast(const struct sockaddr *sa) {
+ switch(sa->sa_family) {
+ case AF_INET:
+ return multicast4((const struct sockaddr_in *)sa);
+ case AF_INET6:
+ return multicast6((const struct sockaddr_in6 *)sa);
+ default:
+ return 0;
+ }
+}
+
+static inline char *format_sockaddr4(const struct sockaddr_in *sin) {
+ char buffer[1024], *r;
+
+ if(sin->sin_port)
+ byte_xasprintf(&r, "%s port %u",
+ inet_ntop(sin->sin_family, &sin->sin_addr,
+ buffer, sizeof buffer),
+ ntohs(sin->sin_port));
+ else
+ byte_xasprintf(&r, "%s",
+ inet_ntop(sin->sin_family, &sin->sin_addr,
+ buffer, sizeof buffer));
+ return r;
+}
+
+static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) {
+ char buffer[1024], *r;
+
+ if(sin6->sin6_port)
+ byte_xasprintf(&r, "%s port %u",
+ inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
+ buffer, sizeof buffer),
+ ntohs(sin6->sin6_port));
+ else
+ byte_xasprintf(&r, "%s",
+ inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
+ buffer, sizeof buffer));
+ return r;
+}
+
+static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
+ return xstrdup(sun->sun_path);
+}
+
+/** @brief Construct a text description a sockaddr */
+char *format_sockaddr(const struct sockaddr *sa) {
+ switch(sa->sa_family) {
+ case AF_INET:
+ return format_sockaddr4((const struct sockaddr_in *)sa);
+ case AF_INET6:
+ return format_sockaddr6((const struct sockaddr_in6 *)sa);
+ case AF_UNIX:
+ return format_sockaddrun((const struct sockaddr_un *)sa);
+ default:
+ return 0;
+ }
+}
+