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#!/bin/bash
exit_msg(){
EXIT_MSG=$1
echo ${EXIT_MSG}
exit 0
}
ROOT_DIR="/opt/mgw"
DEV_CONF_PATH="${ROOT_DIR}/conf/dev.conf"
TAP_NAME=""
TAP_ADDR=""
TUN_NAME=""
PID_FILE="${ROOT_DIR}/mgw.pid"
#read dev.conf
[ ! -f ${DEV_CONF_PATH} ] && exit_msg "${ROOT_DIR}/conf/dev.conf not existed"
source ${DEV_CONF_PATH}
[ ${TAP_NAME} = "" ] && exit_msg "TAP_NAME is null, please check ${ROOT_DIR}/conf/dev.conf"
[ ${TAP_ADDR} = "" ] && exit_msg "TAP_ADDR is null, please check ${ROOT_DIR}/conf/dev.conf"
[ ${TUN_NAME} = "" ] && exit_msg "TUN_NAME is null, please check ${ROOT_DIR}/conf/dev.conf"
get_status() {
#0 stopped
local status=0
#1 running
[ -f ${PID_FILE} ] && ps -hp "$(cat ${PID_FILE})" && ${status}=1
return ${status}
}
start_mgw() {
#check if mgw is running
local status
get_status || status=$?
[[ ${status} -eq 1 ]] && exit_msg "mgw is running"
#set tap/tun
ip addr add ${TAP_ADDR} dev ${TAP_NAME}
ip tuntap add dev ${TUN_NAME} mode tun
ifconfig ${TUN_NAME} up
ip rule add iif ${TAP_NAME} tab 100
ip route add default dev ${TUN_NAME} table 100
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
sysctl -w net.ipv4.conf.default.rp_filter=0 >> /dev/null
#[[ $? -ne 0 ]] && exit_msg "failed at setup tap/tun"
#start mgw
[ ! -f "${ROOT_DIR}/mgw" ] && exit_msg "${ROOT_DIR}/mgw not existed"
[ ! -f "${ROOT_DIR}/conf/mgw.conf" ] && exit_msg "${ROOT_DIR}/conf/mgw.conf not existed"
"${ROOT_DIR}/mgw" "${ROOT_DIR}/conf/mgw.conf" >> /dev/null 2>&1 &
PID=$!
echo $PID > $PID_FILE
#block in front
while true; do
ps -hp ${PID} >> /dev/null
if [[ $? -ne 0 ]]; then
stop_mgw
exit_msg "mgw has stopped"
fi
sleep 3
done
}
check_mgw(){
get_status
if [[ $? -eq 1 ]]; then
exit_msg "mgw is running"
else
exit_msg "mgw has stopped"
fi
}
stop_mgw() {
[ -f ${PID_FILE} ] && ps -hp $(cat ${PID_FILE}) >> /dev/null && kill -9 $(cat ${PID_FILE})
rm -f ${PID_FILE}
#unset tap/tun
ip addr del ${TAP_ADDR} dev ${TAP_NAME} >> /dev/null 2>&1
ip rule del iif ${TAP_NAME} tab 100 >> /dev/null 2>&1
ip route del default dev ${TUN_NAME} table 100 >> /dev/null 2>&1
sleep 5
ip tuntap del dev ${TUN_NAME} mode tun >> /dev/null 2>&1
exit_msg "mgw has stopped"
}
case "$1" in
start)
start_mgw
;;
stop)
stop_mgw
;;
status)
check_mgw
;;
*)
echo "$USAGE"
exit 3
;;
esac
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