157 lines
6.0 KiB
Bash
Executable File
157 lines
6.0 KiB
Bash
Executable File
#!/bin/sh
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# Copyright(C) 2018, Rafal Kupiec <belliash@codingworkshop.eu.org>
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source /lib/functions/network.sh
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DAEMONIZE=0
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LOGGER_ALERT=1
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LOGGER_CRITICAL=2
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LOGGER_ERROR=3
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LOGGER_WARNING=4
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LOGGER_NOTICE=5
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LOGGER_INFO=6
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LOGGER_DEBUG=7
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CHECK_HOST=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].check_host)
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FLAPPING=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].flapping)
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INTERVAL=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].interval)
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SLEEP=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].sleep)
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WAN_PRIMARY=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].wan_primary)
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WAN_PRIMARY_METRIC=$(/sbin/uci -q get network.${WAN_PRIMARY}.metric)
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WAN_SECONDARY=$(/sbin/uci -q get wanmonitor.@wanmonitor[0].wan_secondary)
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WAN_SECONDARY_METRIC=$(/sbin/uci -q get network.${WAN_SECONDARY}.metric)
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function initialize() {
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network_get_device IFNAME_WAN_PRIMARY ${WAN_PRIMARY}
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network_get_gateway GATEWAY_WAN_PRIMARY ${WAN_PRIMARY}
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network_get_device IFNAME_WAN_SECONDARY ${WAN_SECONDARY}
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network_get_gateway GATEWAY_WAN_SECONDARY ${WAN_SECONDARY}
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if [ "x${IFNAME_WAN_PRIMARY}" = "x" ]; then
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IFNAME_WAN_PRIMARY=$(/sbin/uci -q -P /var/state get network.${WAN_PRIMARY}.ifname)
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fi
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if [ "x${GATEWAY_WAN_PRIMARY}" = "x" ]; then
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GATEWAY_WAN_PRIMARY=$(uci -q -P /var/state get network.${WAN_PRIMARY}.gateway)
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fi
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if [ "x${GATEWAY_WAN_PRIMARY}" = "x" ]; then
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GATEWAY_WAN_PRIMARY=$(ifstatus ${WAN_PRIMARY} | grep -A 2 "\"target\": \"0.0.0.0\"," | awk '/nexthop/ {gsub(/[",]/, "");print $2}')
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fi
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if [ "x${IFNAME_WAN_SECONDARY}" = "x" ]; then
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IFNAME_WAN_SECONDARY=$(/sbin/uci -q -P /var/state get network.${WAN_SECONDARY}.ifname)
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fi
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if [ "x${GATEWAY_WAN_SECONDARY}" = "x" ]; then
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GATEWAY_WAN_SECONDARY=$(uci -q -P /var/state get network.${WAN_SECONDARY}.gateway)
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fi
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if [ "x${GATEWAY_WAN_SECONDARY}" = "x" ]; then
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GATEWAY_WAN_SECONDARY=$(ifstatus ${WAN_SECONDARY} | grep -A 2 "\"target\": \"0.0.0.0\"," | awk '/nexthop/ {gsub(/[",]/, "");print $2}')
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fi
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}
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function prepare() {
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/usr/bin/logger -t $0 -p ${LOGGER_NOTICE} "Starting WAN Monitor ..."
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sleep ${SLEEP}
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/usr/bin/logger -t $0 -p ${LOGGER_NOTICE} "Initializing WAN Monitor & Failover Connection Manager"
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initialize
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for IFNAME_WAN in ${IFNAME_WAN_PRIMARY} ${IFNAME_WAN_SECONDARY}; do
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if [ "x${IFNAME_WAN}" = "x" ]; then
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/usr/bin/logger -t $0 -p ${LOGGER_CRITICAL} "Lack of logical interface for one of WAN connections!"
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exit 1
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fi
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done
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for GATEWAY_WAN in ${GATEWAY_WAN_PRIMARY} ${GATEWAY_WAN_SECONDARY}; do
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if [ "x${GATEWAY_WAN}" = "x" ]; then
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/usr/bin/logger -t $0 -p ${LOGGER_CRITICAL} "Lack of gateway on logical interface for one of WAN connections!"
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exit 2
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fi
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done
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/usr/bin/logger -t $0 -p ${LOGGER_DEBUG} "Primary WAN Interface: ${IFNAME_WAN_PRIMARY}, Gateway: ${GATEWAY_WAN_PRIMARY}, Metric: ${WAN_PRIMARY_METRIC:-0}"
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/usr/bin/logger -t $0 -p ${LOGGER_DEBUG} "Secondary WAN Interface: ${IFNAME_WAN_SECONDARY}, Gateway: ${GATEWAY_WAN_SECONDARY}, Metric: ${WAN_SECONDARY_METRIC:-0}"
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/usr/bin/logger -t $0 -p ${LOGGER_DEBUG} "Checking host: ${CHECK_HOST} every ${INTERVAL} seconds interval"
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}
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function status() {
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echo -e "Primary WAN Interface: ${IFNAME_WAN_PRIMARY}, Gateway: ${GATEWAY_WAN_PRIMARY}, Metric: ${WAN_PRIMARY_METRIC:-0}"
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echo -e "Secondary WAN Interface ${IFNAME_WAN_SECONDARY}, Gateway: ${GATEWAY_WAN_SECONDARY}, Metric: ${WAN_SECONDARY_METRIC:-0}"
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echo -e "Checking host: ${CHECK_HOST} every ${INTERVAL} seconds interval"
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echo
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ACTIVE=$(/bin/ps | grep 'wanmonitor -d' | grep -v 'grep' | wc -l)
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if [ "x${ACTIVE}" = "x0" ]; then
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echo -e "WAN Monitor & Failover Connection Manager is NOT RUNNING"
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else
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echo -e "WAN Monitor & Failover Connection Manager is RUNNING"
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fi
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ACTIVE_INTERFACE=$(route | grep default | awk '{print $8}')
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if [ "x${ACTIVE_INTERFACE}" = "x${IFNAME_WAN_PRIMARY}" ]; then
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ACTIVE_WAN="${WAN_PRIMARY}"
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elif [ "x${ACTIVE_INTERFACE}" = "x${IFNAME_WAN_SECONDARY}" ]; then
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ACTIVE_WAN="${WAN_SECONDARY}"
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else
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ACTIVE_WAN="UNKNOWN"
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fi
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echo -e "Active WAN connection: ${ACTIVE_WAN}"
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}
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until [[ -z "${1}" ]]; do
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case "${1}" in
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-d|--daemon)
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DAEMONIZE=1
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;;
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*)
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echo "Unknown option: ${1}"
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;;
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esac
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shift
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done
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if [ "x${DAEMONIZE}" = "x0" ]; then
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initialize
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status
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exit 0
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fi
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prepare
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/usr/bin/logger -t $0 -p ${LOGGER_NOTICE} "Entering link monitoring loop ..."
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WAN=0
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while true; do
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WAN_PRIMARY_STATUS=$(ifstatus ${WAN_PRIMARY} | grep \"up\" | awk '{gsub(/[",]/, ""); print $2}')
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if [ "x${WAN_PRIMARY_STATUS}" = "xtrue" ]; then
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CHECK_HOST_ROUTE=$(route | grep ${CHECK_HOST} | grep ${IFNAME_WAN_PRIMARY} | wc -l)
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if [ "x${CHECK_HOST_ROUTE}" = "x0" ]; then
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/sbin/route add -host ${CHECK_HOST} gateway ${GATEWAY_WAN_PRIMARY} metric 0 ${IFNAME_WAN_PRIMARY} &>/dev/null
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fi
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WAN_PRIMARY_PING=$(ping -I ${IFNAME_WAN_PRIMARY} -w 3 -c 3 ${CHECK_HOST} 2>/dev/null | awk '/packets received/ {print $4}')
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fi
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if [ "x${WAN_PRIMARY_STATUS}" = "xfalse" ] || [ "x${WAN_PRIMARY_PING}" = "x0" ]; then
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if [ "${WAN}" = "0" ] || [ "${WAN}" = "1" ]; then
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/usr/bin/logger -t $0 -p ${LOGGER_ALERT} "Primary WAN Interface is DOWN! Switching traffic to ${WAN_SECONDARY}."
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/sbin/route del default gw ${GATEWAY_WAN_PRIMARY} metric ${WAN_PRIMARY_METRIC:-0} ${IFNAME_WAN_PRIMARY} &>/dev/null
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CHECK_SECONDARY_ROUTE=$(route | grep default | grep ${IFNAME_WAN_SECONDARY} | wc -l)
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if [ "x${CHECK_SECONDARY_ROUTE}" = "x0" ]; then
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/sbin/route add default gw ${GATEWAY_WAN_SECONDARY} metric ${WAN_SECONDARY_METRIC:-0} ${IFNAME_WAN_SECONDARY} &>/dev/null
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fi
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WAN=2
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sleep ${FLAPPING}
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fi
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else
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if [ "${WAN}" = "0" ] || [ "${WAN}" = "2" ]; then
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/usr/bin/logger -t $0 -p ${LOGGER_ALERT} "Primary WAN Interface is UP! Switching traffic to ${WAN_PRIMARY}."
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/sbin/route del default gw ${GATEWAY_WAN_SECONDARY} metric ${WAN_SECONDARY_METRIC:-0} ${IFNAME_WAN_SECONDARY} &>/dev/null
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CHECK_PRIMARY_ROUTE=$(route | grep default | grep ${IFNAME_WAN_PRIMARY} | wc -l)
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if [ "x${CHECK_PRIMARY_ROUTE}" = "x0" ]; then
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/sbin/route add default gw ${GATEWAY_WAN_PRIMARY} metric ${WAN_PRIMARY_METRIC:-0} ${IFNAME_WAN_PRIMARY} &>/dev/null
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fi
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WAN=1
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fi
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fi
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sleep ${INTERVAL}
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done
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