lookup_host
if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
if (lookup_host(arg, (struct in_addr *)paddr) != 0)
if (lookup_host(key, (struct in_addr *)&addr) != 0)
if (lookup_host(arg, &ipaddr) == 0) {
if (lookup_host(n, &ipaddr) == 0) {