55 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03#4# add private ipv4 and ipv6 addresses to loopback5 6readonly V6_INNER='100::a/128'7readonly V4_INNER='192.168.0.1/32'8 9if getopts ":s" opt; then10 readonly SIT_DEV_NAME='sixtofourtest0'11 readonly V6_SIT='2::/64'12 readonly V4_SIT='172.17.0.1/32'13 shift14fi15 16fail() {17 echo "error: $*" 1>&218 exit 119}20 21setup() {22 ip -6 addr add "${V6_INNER}" dev lo || fail 'failed to setup v6 address'23 ip -4 addr add "${V4_INNER}" dev lo || fail 'failed to setup v4 address'24 25 if [[ -n "${V6_SIT}" ]]; then26 ip link add "${SIT_DEV_NAME}" type sit remote any local any \27 || fail 'failed to add sit'28 ip link set dev "${SIT_DEV_NAME}" up \29 || fail 'failed to bring sit device up'30 ip -6 addr add "${V6_SIT}" dev "${SIT_DEV_NAME}" \31 || fail 'failed to setup v6 SIT address'32 ip -4 addr add "${V4_SIT}" dev "${SIT_DEV_NAME}" \33 || fail 'failed to setup v4 SIT address'34 fi35 36 sleep 2 # avoid race causing bind to fail37}38 39cleanup() {40 if [[ -n "${V6_SIT}" ]]; then41 ip -4 addr del "${V4_SIT}" dev "${SIT_DEV_NAME}"42 ip -6 addr del "${V6_SIT}" dev "${SIT_DEV_NAME}"43 ip link del "${SIT_DEV_NAME}"44 fi45 46 ip -4 addr del "${V4_INNER}" dev lo47 ip -6 addr del "${V6_INNER}" dev lo48}49 50trap cleanup EXIT51 52setup53"$@"54exit "$?"55