+/*
+ * convert a presentation address string to a sockaddr_storage struct. Returns
+ * true on success and false on failure.
+ */
+static int
+addrstr_to_sockaddr(struct sockaddr *sa, const char *addr, const int port)
+{
+ struct sockaddr_in *s4 = (struct sockaddr_in *) sa;
+
+ if (inet_pton(AF_INET, addr, &s4->sin_addr)) {
+ s4->sin_family = AF_INET;
+ s4->sin_port = htons(port);
+ } else {
+ printerr(0, "ERROR: unable to convert %s to address\n", addr);
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * convert a sockaddr to a hostname
+ */
+static char *
+sockaddr_to_hostname(const struct sockaddr *sa, const char *addr)
+{
+ socklen_t addrlen;
+ int err;
+ char *hostname;
+ char hbuf[NI_MAXHOST];
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ addrlen = sizeof(struct sockaddr_in);
+ break;
+ default:
+ printerr(0, "ERROR: unrecognized addr family %d\n",
+ sa->sa_family);
+ return NULL;
+ }
+
+ err = getnameinfo(sa, addrlen, hbuf, sizeof(hbuf), NULL, 0,
+ NI_NAMEREQD);
+ if (err) {
+ printerr(0, "ERROR: unable to resolve %s to hostname: %s\n",
+ addr, err == EAI_SYSTEM ? strerror(err) :
+ gai_strerror(err));
+ return NULL;
+ }
+
+ hostname = strdup(hbuf);
+
+ return hostname;
+}
+