+/*
+ * Take care to perform an explicit reverse lookup on presentation
+ * addresses. Otherwise we don't get a real canonical name or a
+ * complete list of addresses.
+ */
+static struct addrinfo *
+address_list(const char *hostname)
+{
+ struct addrinfo *ai;
+ char *cname;
+
+ ai = host_pton(hostname);
+ if (ai != NULL) {
+ /* @hostname was a presentation address */
+ cname = host_canonname(ai->ai_addr);
+ freeaddrinfo(ai);
+ if (cname != NULL)
+ goto out;
+ }
+ /* @hostname was a hostname or had no reverse mapping */
+ cname = strdup(hostname);
+ if (cname == NULL)
+ return NULL;
+
+out:
+ ai = host_addrinfo(cname);
+ free(cname);
+ return ai;
+}
+