-host_af = (Ustrchr(h->address, ':') == NULL)? AF_INET:AF_INET6;
-r = s = ip_socket(SOCK_DGRAM, host_af);
-if (r < 0) goto defer;
-r = ip_connect(s, host_af, h->address, portnum, 1);
-if (r < 0) goto defer;
-len = strlen(arg);
-r = send(s, arg, len, MSG_NOSIGNAL);
+r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum,
+ 1, NULL, &errstr);