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

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

. /usr/lib/unbound/iptools.sh

export OMR_TRACKER_STATUS
export OMR_TRACKER_STATUS_MSG

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

_post_tracking() {
	[ ! -d /usr/share/omr/server-post-tracking.d/ ] && return
	for tracker_bin in /usr/share/omr/server-post-tracking.d/*; do
		[ -x "$tracker_bin" ] && (
			_log() {
				logger -t "post-tracking-${tracker_bin##*/}" "$*"
			}
			. "$tracker_bin" 2>&1
		)
	done
}

_ping_server() {
	local host=$1
	ret=$(ping \
	    -w "$OMR_TRACKER_TIMEOUT" \
	    -c 1 \
	    -q \
	    "${host}"
	) && echo "$ret" | grep -sq " 0% packet loss" && {
		server_ping=true
	}
}

_check_server() {
	local host=$1
	local port=$2
	local k=0
	local valid_ip6=$(valid_subnet6 $host)
	while [ "$server_ping" = false ] && [ "$k" -le "$retry" ]; do
		if [ "$valid_ip6" != "ok" ]; then
			ret=$(curl \
			    --max-time "$OMR_TRACKER_TIMEOUT" \
			    -s \
			    -k \
			    "https://${host}:${port}/"
			)
		else
			ret=$(curl \
			    --max-time "$OMR_TRACKER_TIMEOUT" \
			    -s \
			    -k \
			    "https://[${host}]:${port}/"
			)
		fi
		[ -n "$ret" ] && server_ping=true
		k=$((k+1))
		sleep "${intervaltries}"
	done
}

_check_server_intf() {
	local host=$1
	local port=$2
	local valid_ip6=$(valid_subnet6 $host)
	for intf in $(multipath 2>/dev/null | awk '/default/ {print $1}'); do
		local k=0
		while [ "$server_ping" = false ] && [ "$k" -le "$retry" ]; do
			if [ "$valid_ip6" != "ok" ]; then
				ret=$(curl \
				    --max-time "$OMR_TRACKER_TIMEOUT" \
				    -s \
				    -k \
				    --interface $intf \
				    "https://${host}:${port}/"
				)
			else
				ret=$(curl \
				    --max-time "$OMR_TRACKER_TIMEOUT" \
				    -s \
				    -k \
				    "https://[${host}%${intf}]:${port}/"
				)
			fi
			[ -n "$ret" ] && {
				server_ping=true
			}
			k=$((k+1))
			sleep "${intervaltries}"
		done
	done
}

_get_server_name() {
	local serverid=$1
	local serverip=$2
	config_get serveripc $serverid server
	if [ "$serveripc" = "$serverip" ]; then
		servername=$serverid
	fi
}

_disable_current() {
	local serv=$1
	uci -q set openmptcprouter.${server}.current=0
}

_disable_redir() {
	local redir=$1
	local serverdisable=$2
	local shadowsocks="$3"
	config_get serverss $redir server
	if [ "$serverss" = "$serverdisable" ]; then
		uci -q set ${shadowsocks}.${redir}.disabled=1
	fi
}

_enable_redir() {
	local redir=$1
	local shadowsocks="$2"
	config_get serverss $redir server
	if [ "$serverss" = "sss${count}" ]; then
		uci -q set ${shadowsocks}.${redir}.disabled=0
	fi
}

_check_master() {
	local name=$1
	local count=0
	local countips=0
	local changes="0"
	config_get master $1 master
	config_get ip $1 ip
	config_get port $1 port "65500"
	config_get disabled $1 disabled
	serverip=""
	[ "$master" = "1" ] && [ -n "$ip" ] && [ "$disabled" != "1" ] && {
		check_ip() {
			local ipd=$1
			server_ping=false
			#[ -n "$serverip" ] && [ "$server_ping" = true ] && return
			ipresolve="$(resolveip -4 $ipd | head -n 1)"
			if [ -n "$ipresolve" ]; then
				serverip="$ipresolve"
			else
				ip6resolve="$(resolveip -6 $ipd | head -n 1)"
				[ -n "$ip6resolve" ] && serverip="$ip6resolve"
			fi
			[ -z "$serverip" ] && return
			#_ping_server $serverip
			#_check_server $serverip $port
			_check_server_intf $serverip $port
			[ "$server_ping" = true ] && {
				oneserverup="1"
			}
			countips=$((countips+1))
			set_ip
		}
		set_ip() {
			ip="$serverip"
			if [ "$server_ping" = true ]; then
				if [ "$(uci -q get shadowsocks-libev.sss${count}.server | tr -d '\n')" != "$ip" ] && [ "$(uci -q get shadowsocks-rust.sss${count}.server | tr -d '\n')" != "$ip" ]; then
					logger -t "OMR-Tracker-Server" "Master server ${name} up ($ip), set it back"
					changes="1"
					#logger -t "OMR-Tracker-Server" "$(uci -q get shadowsocks-libev.sss${count}.server | tr -d '\n') - $ip"
					uci -q batch <<-EOF >/dev/null
						set shadowsocks-libev.sss${count}.server=$ip
						set shadowsocks-rust.sss${count}.server=$ip
					EOF
					if [ "$(uci -q get openmptcprouter.settings.proxy)" = "shadowsocks-rust" ]; then
						uci -q batch <<-EOF >/dev/null
							set shadowsocks-rust.sss${count}.disabled=0
						EOF
					fi
					if [ "$(uci -q get openmptcprouter.settings.proxy)" = "shadowsocks" ]; then
						uci -q batch <<-EOF >/dev/null
							set shadowsocks-libev.sss${count}.disabled=0
						EOF
					fi
					if [ -z "$(uci -q get openvpn.omr.remote | grep $ip)" ]; then
						uci -q batch <<-EOF >/dev/null
							add_list openvpn.omr.remote=$ip
						EOF
					fi
					if [ "$count" -eq "0" ]; then
						config_load openmptcprouter
						config_foreach _disable_current server
						uci -q batch <<-EOF >/dev/null
							set xray.omrout.s_vmess_address=$ip
							set xray.omrout.s_vless_address=$ip
							set xray.omrout.s_vless_reality_address=$ip
							set xray.omrout.s_trojan_address=$ip
							set xray.omrout.s_socks_address=$ip
							set xray.omrout.s_shadowsocks_address=$ip
							set v2ray.omrout.s_vmess_address=$ip
							set v2ray.omrout.s_vless_address=$ip
							set v2ray.omrout.s_trojan_address=$ip
							set v2ray.omrout.s_socks_address=$ip
							commit v2ray
							commit xray
							set glorytun.vpn.host=$ip
							commit glorytun
							glorytun-udp.vpn.host=$ip
							commit glorytun
							set dsvpn.vpn.host=$ip
							commit dsvpn
							set mlvpn.general.host=$ip
							commit mlvpn
							del openvpn.omr.remote
							add_list openvpn.omr.remote=$ip
							commit openvpn
							set openmptcprouter.${name}.current='1'
							commit openmptcprouter
						EOF
						/etc/init.d/openmptcprouter-vps get_openvpn_key $name >/dev/null 2>/dev/null
						#/etc/init.d/openmptcprouter-vps restart >/dev/null 2>/dev/null
						/etc/init.d/v2ray restart >/dev/null 2>/dev/null
						/etc/init.d/xray restart >/dev/null 2>/dev/null
						/etc/init.d/glorytun restart >/dev/null 2>/dev/null
						/etc/init.d/glorytun-udp restart >/dev/null 2>/dev/null
						/etc/init.d/mlvpn restart >/dev/null 2>/dev/null
						#/etc/init.d/openvpn restart omr >/dev/null 2>/dev/null
						/etc/init.d/dsvpn restart >/dev/null 2>/dev/null
						/etc/init.d/mptcpovervpn restart >/dev/null 2>/dev/null
					fi
				fi
				config_load shadowsocks-libev
				config_foreach _enable_redir ss_redir "shadowsocks-libev"
				config_load shadowsocks-rust
				config_foreach _enable_redir ss_redir "shadowsocks-rust"
				
				OMR_TRACKER_STATUS_MSG="Answer to ping and to API check"
				mail_alert="$(uci -q get omr-tracker.server.mail_alert)"
				#[ -z "$mail_alert" ] && mail_alert="$(uci -q get omr-tracker.defaults.mail_alert)"
				[ "$mail_alert" = "1" ] && [ -n "$(uci -q get mail.default.to)" ] && {
					OMR_SYSNAME="$(uci -q get system.@system[0].hostname)"
					if [ "$(uci -q get omr-tracker.defaults.mail_up_subject)" != "" ] && [ "$(uci -q get omr-tracker.defaults.mail_up_message)" != "" ]; then
						mail_subject="$(uci -q get omr-tracker.defaults.mail_up_subject)"
						mail_subject=`echo $mail_subject | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						mail_message="$(uci -q get omr-tracker.defaults.mail_up_message)"
						mail_message=`echo $mail_message | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						echo -e "Subject: ${mail_subject}\n\n${mail_message}" | sendmail $(uci -q get mail.default.to)
					else
						echo -e "Subject: $OMR_SYSNAME: Server ${name} (${ip}) is UP\n. The reason is \"$OMR_TRACKER_STATUS_MSG\"." | sendmail $(uci -q get mail.default.to)
					fi
				}
				OMR_TRACKER_STATUS="OK"
				script_alert_up="$(uci -q get omr-tracker.proxy.script_alert_up)"
				[ -n "$script_alert_up" ] && eval $script_alert_up
				count=$((count+1))
			else
				[ -n "$ip" ] && [ -z "$(logread | tail -n 10 | grep "Master server ${name} down" | grep "$ip")" ] && logger -t "OMR-Tracker-Server" "Master server ${name} down ($ip)"
				OMR_TRACKER_STATUS_MSG="No answer to ping and API check"
				servername=""
				config_load shadowsocks-libev
				config_foreach _get_server_name server $ip
				[ -n "$servername" ] && config_foreach _disable_redir ss_redir $servername "shadowsocks-libev"
				servername=""
				config_load shadowsocks-rust
				config_foreach _get_server_name server $ip
				[ -n "$servername" ] && config_foreach _disable_redir ss_redir $servername "shadowsocks-rust"

				if [ -n "$(uci -q get openvpn.omr.remote | grep $ip)" ]; then
					uci -q batch <<-EOF >/dev/null
						del_list openvpn.omr.remote=$ip
					EOF
				fi


				OMR_TRACKER_STATUS_MSG="No answer to ping and to API check"
				mail_alert="$(uci -q get omr-tracker.server.mail_alert)"
				#[ -z "$mail_alert" ] && mail_alert="$(uci -q get omr-tracker.defaults.mail_alert)"
				[ "$mail_alert" = "1" ] && [ -n "$(uci -q get mail.default.to)" ] && {
					OMR_SYSNAME="$(uci -q get system.@system[0].hostname)"
					if [ "$(uci -q get omr-tracker.defaults.mail_down_subject)" != "" ] && [ "$(uci -q get omr-tracker.defaults.mail_down_message)" != "" ]; then
						mail_subject="$(uci -q get omr-tracker.defaults.mail_down_subject)"
						mail_subject=`echo $mail_subject | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						mail_message="$(uci -q get omr-tracker.defaults.mail_down_message)"
						mail_message=`echo $mail_message | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						echo -e "Subject: ${mail_subject}\n\n${mail_message}" | sendmail $(uci -q get mail.default.to)
					else
						echo -e "Subject: $OMR_SYSNAME: Server ${name} (${ip}) is down\n. The reason is \"$OMR_TRACKER_STATUS_MSG\"." | sendmail $(uci -q get mail.default.to)
					fi
				}
				OMR_TRACKER_STATUS="ERROR"
				script_alert_down="$(uci -q get omr-tracker.proxy.script_alert_down)"
				[ -n "$script_alert_down" ] && eval $script_alert_down
			fi
		}
		config_load openmptcprouter
		config_list_foreach $1 ip check_ip
		#set_ip
		#if [ "$server_ping" = true ] && [ "$countips" = "1" ]; then
		#	uci -q batch <<-EOF >/dev/null
		#		set shadowsocks-libev.sss${count}.server=$ip
		#	EOF
		#	config_foreach _enable_redir ss_redir
		#fi
		if [ "$oneserverup" = "0" ]; then
			uci -q batch <<-EOF >/dev/null
				set openmptcprouter.${name}.current='0'
				commit openmptcprouter
			EOF
		fi
		[ -n "$(uci changes shadowsocks-libev)" ] && changes="1"
		[ -n "$(uci changes shadowsocks-rust)" ] && changes="1"
		[ -n "$(uci changes openvpn)" ] && changes="1"
		uci -q commit shadowsocks-libev
		uci -q commit shadowsocks-rust
		uci -q commit openvpn
		[ "$changes" = "1" ] && {
			/etc/init.d/shadowsocks-libev restart >/dev/null 2>/dev/null
			/etc/init.d/shadowsocks-rust restart >/dev/null 2>/dev/null
			/etc/init.d/openvpn restart omr >/dev/null 2>/dev/null
		}
		break
	}
}

_check_backup() {
	local name=$1
	local count=0
	local countips=0
	local changes="0"
	config_get backup $1 backup
	config_get ip $1 ip
	config_get port $1 port
	config_get disabled $1 disabled
	serverip=""
	[ "$backup" = "1" ] && [ -n "$ip" ] && [ "$disabled" != "1" ] && {
		check_ip() {
			local ipd=$1
			server_ping=false
			#[ -n "$serverip" ] && [ "$server_ping" = true ] && return
			ipresolve="$(resolveip -4 $ipd | head -n 1)"
			if [ -n "$ipresolve" ]; then
				serverip="$ipresolve"
			else
				ip6resolve="$(resolveip -6 $ipd | head -n 1)"
				[ -n "$ip6resolve" ] && serverip="$ip6resolve"
			fi
			[ -z "$serverip" ] && return
			#_ping_server $serverip
			#_check_server $serverip $port
			_check_server_intf $serverip $port
			[ "$server_ping" = true ] && {
				oneserverup="1"
			}
			countips=$((countips+1))
		}
		set_ip() {
			ip="$serverip"
			#[ "$server_ping" = true ] && [ "$(uci -q get shadowsocks-libev.sss${count}.server | tr -d '\n')" = "$ip" ] && break
			if [ "$server_ping" = true ]; then
				if [ "$(uci -q get shadowsocks-libev.sss${count}.server | tr -d '\n')" != "$ip" ] && [ "$(uci -q get shadowsocks-rust.sss${count}.server | tr -d '\n')" != "$ip" ]; then
					logger -t "OMR-Tracker-Server" "Use backup server $1 ($ip)"
					changes="1"
					uci -q batch <<-EOF >/dev/null
						set shadowsocks-libev.sss${count}.server=$ip
						set shadowsocks-rust.sss${count}.server=$ip
					EOF
					if [ "$(uci -q get openmptcprouter.settings.proxy)" = "shadowsocks-rust" ]; then
						uci -q batch <<-EOF >/dev/null
							set shadowsocks-rust.sss${count}.disabled=0
						EOF
					fi
					if [ "$(uci -q get openmptcprouter.settings.proxy)" = "shadowsocks" ]; then
						uci -q batch <<-EOF >/dev/null
							set shadowsocks-libev.sss${count}.disabled=0
						EOF
					fi

					if [ "$count" -eq "0" ]; then
						config_load openmptcprouter
						config_foreach _disable_current server
						uci -q batch <<-EOF >/dev/null
							set xray.omrout.s_vmess_address=$ip
							set xray.omrout.s_vless_address=$ip
							set xray.omrout.s_vless_reality_address=$ip
							set xray.omrout.s_trojan_address=$ip
							set xray.omrout.s_socks_address=$ip
							set xray.omrout.s_shadowsocks_address=$ip
							set v2ray.omrout.s_vmess_address=$ip
							set v2ray.omrout.s_vless_address=$ip
							set v2ray.omrout.s_trojan_address=$ip
							set v2ray.omrout.s_socks_address=$ip
							commit v2ray
							commit xray
							set glorytun.vpn.host=$ip
							commit glorytun
							glorytun-udp.vpn.host=$ip
							commit glorytun
							set dsvpn.vpn.host=$ip
							commit dsvpn
							set mlvpn.general.host=$ip
							commit mlvpn
							del openvpn.omr.remote
							add_list openvpn.omr.remote=$ip
							commit openvpn
							set openmptcprouter.${name}.current='1'
							commit openmptcprouter
						EOF
						/etc/init.d/openmptcprouter-vps get_openvpn_key $name >/dev/null 2>/dev/null
						#/etc/init.d/openmptcprouter-vps restart >/dev/null 2>/dev/null
						/etc/init.d/v2ray restart >/dev/null 2>/dev/null
						/etc/init.d/xray restart >/dev/null 2>/dev/null
						/etc/init.d/glorytun restart >/dev/null 2>/dev/null
						/etc/init.d/glorytun-udp restart >/dev/null 2>/dev/null
						/etc/init.d/mlvpn restart >/dev/null 2>/dev/null
						#/etc/init.d/openvpn restart omr >/dev/null 2>/dev/null
						/etc/init.d/dsvpn restart >/dev/null 2>/dev/null
						/etc/init.d/mptcpovervpn restart >/dev/null 2>/dev/null
					fi
					sleep $waittest
				fi
				
				config_load shadowsocks-libev
				config_foreach _enable_redir ss_redir "shadowsocks-libev"
				config_load shadowsocks-rust
				config_foreach _enable_redir ss_redir "shadowsocks-rust"
				
				OMR_TRACKER_STATUS_MSG="Answer to ping and to API check"
				mail_alert="$(uci -q get omr-tracker.server.mail_alert)"
				#[ -z "$mail_alert" ] && mail_alert="$(uci -q get omr-tracker.defaults.mail_alert)"
				[ "$mail_alert" = "1" ] && [ -n "$(uci -q get mail.default.to)" ] && {
					OMR_SYSNAME="$(uci -q get system.@system[0].hostname)"
					if [ "$(uci -q get omr-tracker.defaults.mail_up_subject)" != "" ] && [ "$(uci -q get omr-tracker.defaults.mail_up_message)" != "" ]; then
						mail_subject="$(uci -q get omr-tracker.defaults.mail_up_subject)"
						mail_subject=`echo $mail_subject | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						mail_message="$(uci -q get omr-tracker.defaults.mail_up_message)"
						mail_message=`echo $mail_message | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						echo -e "Subject: ${mail_subject}\n\n${mail_message}" | sendmail $(uci -q get mail.default.to)
					else
						echo -e "Subject: $OMR_SYSNAME: Server ${name} (${ip}) is UP\n. The reason is \"$OMR_TRACKER_STATUS_MSG\"." | sendmail $(uci -q get mail.default.to)
					fi
				}
				script_alert_up="$(uci -q get omr-tracker.proxy.script_alert_up)"
				[ -n "$script_alert_up" ] && eval $script_alert_up
				count=$((count+1))
			else
				[ -n "$ip" ] && [ -z "$(logread | tail -n 10 | grep "Backup server ${name} down" | grep "$ip")" ] && logger -t "OMR-Tracker-Server" "Backup server ${name} down ($ip)"
				uci -q batch <<-EOF >/dev/null
					set openmptcprouter.${name}.current='0'
					commit openmptcprouter
				EOF
				config_load shadowsocks-libev
				config_foreach _get_server_name server $ip
				[ -n "$servername" ] && config_foreach _disable_redir ss_redir $servername "shadowsocks-libev"
				servername=""
				config_load shadowsocks-rust
				config_foreach _get_server_name server $ip
				[ -n "$servername" ] && config_foreach _disable_redir ss_redir $servername "shadowsocks-rust"

				OMR_TRACKER_STATUS_MSG="No answer to ping and to API check"
				mail_alert="$(uci -q get omr-tracker.server.mail_alert)"
				#[ -z "$mail_alert" ] && mail_alert="$(uci -q get omr-tracker.defaults.mail_alert)"
				[ "$mail_alert" = "1" ] && [ -n "$(uci -q get mail.default.to)" ] && {
					OMR_SYSNAME="$(uci -q get system.@system[0].hostname)"
					if [ "$(uci -q get omr-tracker.defaults.mail_down_subject)" != "" ] && [ "$(uci -q get omr-tracker.defaults.mail_down_message)" != "" ]; then
						mail_subject="$(uci -q get omr-tracker.defaults.mail_down_subject)"
						mail_subject=`echo $mail_subject | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						mail_message="$(uci -q get omr-tracker.defaults.mail_down_message)"
						mail_message=`echo $mail_message | sed -e "s/%SYSNAME%/$OMR_SYSNAME/g" -e "s/%INTERFACE%/Server ${name}/g" -e "s/%DEVICE%/${ip}/g" -e "s/%MESSAGE%/$OMR_TRACKER_STATUS_MSG/g"`
						echo -e "Subject: ${mail_subject}\n\n${mail_message}" | sendmail $(uci -q get mail.default.to)
					else
						echo -e "Subject: $OMR_SYSNAME: Server ${name} (${ip}) is down\n. The reason is \"$OMR_TRACKER_STATUS_MSG\"." | sendmail $(uci -q get mail.default.to)
					fi
				}
				script_alert_down="$(uci -q get omr-tracker.proxy.script_alert_down)"
				[ -n "$script_alert_down" ] && eval $script_alert_down
			fi
			countips=$((countips+1))
		}
		config_load openmptcprouter
		config_list_foreach $1 ip check_ip
		set_ip
		#if [ "$server_ping" = true ] && [ "$countips" = "1" ]; then
		#	uci -q batch <<-EOF >/dev/null
		#		set shadowsocks-libev.sss${count}.server=$ip
		#	EOF
		#	config_foreach _enable_redir ss_redir
		#fi
		if [ "$oneserverup" = "0" ]; then
			uci -q batch <<-EOF >/dev/null
				set openmptcprouter.${name}.current='0'
				commit openmptcprouter
			EOF
		fi

		[ -n "$(uci changes shadowsocks-libev)" ] && changes="1"
		[ -n "$(uci changes shadowsocks-rust)" ] && changes="1"
		[ -n "$(uci changes openvpn)" ] && changes="1"
		uci -q commit shadowsocks-libev
		uci -q commit shadowsocks-rust
		uci -q commit openvpn
		[ "$changes" = "1" ] && {
			/etc/init.d/shadowsocks-libev restart >/dev/null 2>/dev/null
			/etc/init.d/shadowsocks-rust restart >/dev/null 2>/dev/null
			/etc/init.d/openvpn restart omr >/dev/null 2>/dev/null
		}
		[ "$server_ping" = true ] && break
	}
}

. /lib/functions.sh

timeout=${OMR_TRACKER_TIMEOUT:-5}
interval=${OMR_TRACKER_INTERVAL:-10}
intervaltries=${OMR_TRACKER_INTERVAL_TRIES:-2}
retry=${OMR_TRACKER_TRIES:-4}
waittest=${OMR_TRACKER_WAIT_TEST:-0}
while true; do
	server_ping=false
	oneserverup="0"
	config_load openmptcprouter
	config_foreach _check_master server
	[ "$oneserverup" = "0" ] && {
		config_load openmptcprouter
		config_foreach _check_backup server
	}
	sleep "${interval}"
done