#!/bin/sh
# vim: set noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 :

name=$0
basename="$(basename $0)"

log() {
	logger -p daemon.info -t "${basename}" "$@"
}

timeout=${OMR_TRACKER_TIMEOUT:-5}
interval=${OMR_TRACKER_INTERVAL:-10}
retry=${OMR_TRACKER_TRIES:-4}
proxy=${OMR_TRACKER_PROXY:-127.0.0.1:1111}
hosts=${OMR_TRACKER_HOSTS:-1.1.1.1 1.0.0.1 23.96.52.53}

nodns=0

last=0

while true; do
	host="${hosts%% *}"
	[ "$host" = "$hosts" ] || {
		hosts="${hosts#* } $host"
	}
	if curl -s --socks5 "${proxy}" --max-time "${timeout}" "$host" &>/dev/null ; then
		[ "${last}" -ge "${retry}" ] && log "Shadowsocks is up (can contact ${host})"
		/etc/init.d/shadowsocks-libev rules_up 2> /dev/null
		last=0
	else
		last=$((last + 1 ))
		[ "${last}" -eq "${retry}" ] && {
			log "Shadowsocks is down (can't contact ${host})"
			/etc/init.d/shadowsocks-libev rules_down 2> /dev/null
		}
	fi
	sleep "${interval}"
done