. /lib/functions/network.sh

default_gw=$(ip route get 1.1.1.1 | grep via | awk '{print $3}')
default_gw6=$(ip -6 route get 2606:4700:4700::1111 | grep via | awk '{print $3}')

interface_up=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["up"]')

# An interface in error will never be used in MPTCP
if [ "$OMR_TRACKER_STATUS" = "ERROR" ] || ([ "$OMR_TRACKER_INTERFACE" != "omrvpn" ] && [ "$interface_up" != "true" ]); then
	#interface_autostart=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["autostart"]')
	#interface_available=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["available"]')
	#interface_pending=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["pending"]')
	#interface_error=$(ifstatus "$OMR_TRACKER_INTERFACE" 2>/dev/null | jsonfilter -q -e '@["errors"][0].code')

	#if [ "$interface_available" = "true" ] && [ -n "$OMR_TRACKER_INTERFACE" ] && ([ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "modemmanager" ] || [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "wireguard" ]) && [ "$interface_error" != "MM_PINCODE_REQUIRED" ] && [ "$interface_error" != "MM_FAILED_REASON_SIM_MISSING" ]; then
	#if [ "$interface_available" = "true" ] && [ "$interface_up" = "false" ] && [ -n "$OMR_TRACKER_INTERFACE" ] && ([ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "modemmanager" ] || [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "wireguard" ]); then
	#	_log "No answer from $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE), restart interface"
	#	_log "Set $OMR_TRACKER_INTERFACE down"
	#	ifdown $OMR_TRACKER_INTERFACE
	#	sleep 5
	#	_log "Set $OMR_TRACKER_INTERFACE up"
	#	ifup $OMR_TRACKER_INTERFACE
	#	sleep 30
	#if [ -n "$OMR_TRACKER_INTERFACE" ] && [ -n "$OMR_TRACKER_DEVICE" ] && [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "modemmanager" ] && [ "$interface_up" = "false" ] && [ "$interface_available" = "false" ] && [ "$interface_pending" = "false" ] && [ "$interface_autostart" = "true" ]; then
	if [ -n "$OMR_TRACKER_INTERFACE" ] && [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "modemmanager" ]; then
		modemfind="0"
		device="$(uci -q get network.$OMR_TRACKER_INTERFACE.device)"
		. /usr/share/ModemManager/modemmanager.common
		[ -n "$device" ] && MODEM_STATUS="$(timeout 3 mmcli -m $device -K)"
		modem=$device
		if [ -n "$MODEM_STATUS" ]; then
			modemfind="1"
			mm_state=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.state")
			if [ "$mm_state" = "failed" ]; then
				mm_state_failed=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.state-failed-reason")
				if [ "$mm_state_failed" = "unknown-capabilities" ]; then
					_log "Interface $OMR_TRACKER_INTERFACE in failed state in ModemManager, reset modem..."
					/usr/bin/mmcli -m ${modem} -r 2>&1 >/dev/null
					sleep 30
				elif false && [ "$mm_state_failed" = "sim-missing" ]; then
					_log "Interface $OMR_TRACKER_INTERFACE in failed state in ModemManager, reset modem..."
					/usr/bin/mmcli -m ${modem} -r 2>&1 >/dev/null
					#_log "Interface $OMR_TRACKER_INTERFACE in failed state sim-missing in ModemManager, reset modem..."
					#mm_primary_port=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.primary-port")
					#mbimcli -p -d /dev/$mm_primary_port --ms-device-reset 2>&1 >/dev/null
				fi
			elif [ "$mm_state" = "connected" ] || [ "$mm_state" = "enabled" ]; then
				_log "No answer from $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE), restart interface"
				_log "Set $OMR_TRACKER_INTERFACE down"
				ifdown $OMR_TRACKER_INTERFACE
				sleep 5
				_log "Set $OMR_TRACKER_INTERFACE up"
				ifup $OMR_TRACKER_INTERFACE
				sleep 30
			elif [ "$mm_state" = "disabled" ]; then
			# [ -n "$(echo $modeminfo | grep 'modem.3gpp.registration-state ' | grep home)" ]; then
				_log "Interface $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) disabled, set it up"
				/usr/bin/mmcli -m ${modem} -e 2>&1 >/dev/null
				ifup $OMR_TRACKER_INTERFACE
				sleep 30
			elif [ "$mm_state" = "registered" ]; then
				_log "Interface $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) registered, set it up"
				ifup $OMR_TRACKER_INTERFACE
				sleep 30
			elif [ "$mm_state" = "locked" ]; then
				mm_unlock_required=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.unlock-required")
				mm_generic_sim=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.sim")
				#mm_primary_port=$(modemmanager_get_field "${MODEM_STATUS}" "modem.generic.primary-port")
				#mm_drivers=$(modemmanager_get_multivalue_field "${MODEM_STATUS}" "modem.generic.drivers")
				mm_unlock_retries=$(modemmanager_get_multivalue_field "${MODEM_STATUS}" "modem.generic.unlock-retries" | awk '{print substr($2,2,length($2)-2)}')
				if [ "$mm_unlock_required" = "sim-pin" ]; then
					# Sometimes PIN is not correctly sent to modem
					if [ -n "$(uci -q get network.$OMR_TRACKER_INTERFACE.pincode)" ]; then
						if [ "$mm_unlock_retries" -gt "1" ] && [ -n "$(uci -q get network.$OMR_TRACKER_INTERFACE.pincode)" ]; then
							_log "Interface $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) locked, set PIN"
							mmcli -a -m ${modem} -i $mm_generic_sim --pin=$(uci -q get network.$OMR_TRACKER_INTERFACE.pincode) 2>&1 >/dev/null
							sleep 20
							ifup $OMR_TRACKER_INTERFACE
						fi
					fi
				elif [ "$mm_unlock_required" = "sim-puk" ] && [ "$mm_unlock_retries" -gt "1" ] && [ -n "$(uci -q get network.$OMR_TRACKER_INTERFACE.pukcode)" ] && [ -n "$(uci -q get network.$OMR_TRACKER_INTERFACE.pincode)" ]; then
					_log "Interface $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) locked, set PUK"
					mmcli -i $mm_generic_sim --puk=$(uci -q get network.$OMR_TRACKER_INTERFACE.pukcode) --pin=$(uci -q get network.$OMR_TRACKER_INTERFACE.pincode) 2>&1 >/dev/null
					sleep 30
				fi
			fi
		fi
		if [ "$modemfind" = "0" ]; then
			#_log "Can't find $OMR_TRACKER_INTERFACE in ModemManager, rescan modem..."
			#/usr/bin/mmcli -S 2>&1 >/dev/null
			#_log "Can't find $OMR_TRACKER_INTERFACE in ModemManager, restart modemmanager..."
			_log "Can't find $OMR_TRACKER_INTERFACE in ModemManager"
			#/etc/init.d/modemmanager restart
			sleep 30
		fi
	fi
	#elif [ -n "$OMR_TRACKER_INTERFACE" ] && [ -n "$OMR_TRACKER_DEVICE" ] && [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.proto)" = "modemmanager" ] && [ "$interface_available" = "false" ]; then
	#	for modem in $(timeout 3 mmcli -L | awk -F/ '{ print $6}' | awk '{print $1}'); do
	#		if [ -n "$(timeout 2 mmcli -m $modem -K | grep $OMR_TRACKER_DEVICE)" ]; then
	#			modem_device=$(timeout 2 mmcli -m $modem -K | grep 'modem.generic.device ' | awk '{print $3}')
	#			[ -n "$modem_device" ] && modem_interface=$(uci -q show network | grep $modem_device | awk -F. '{print $2}')
	#			[ -n "$modem_interface" ] && {
	#				_log "No answer from $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE), restart associed interface $modem_interface"
	#				ifdown $modem_interface
	#				sleep 5
	#				ifup $modem_interface
	#				sleep 30
	#			}
	#		fi
	#	done
	#fi

	# This part must be done after modems restart because we have no idea when modems will be ready again... (another solution would be to check ModemManager status)
	if [ "$OMR_TRACKER_PREV_STATUS" = "$OMR_TRACKER_STATUS" ]; then
		exit 0
	fi

	# Get the current multipath status
	multipath_status="off"
#	[ "$OMR_TRACKER_INTERFACE" = "omrvpn" ] && multipath $OMR_TRACKER_DEVICE off 2>&1 >/dev/null
#	[ "$OMR_TRACKER_INTERFACE" = "omr6in4" ] && multipath $OMR_TRACKER_DEVICE off 2>&1 >/dev/null
	if [ -e "/sys/class/net/$OMR_TRACKER_DEVICE" ]; then
		case "$(multipath "$OMR_TRACKER_DEVICE")" in
			*default*)      multipath_status="on"       ;;
			*backup*)       multipath_status="backup"   ;;
			*handover*)     multipath_status="handover" ;;
		esac
	fi

	if [ "$multipath_status" != "off" ] || ([ -n "$OMR_TRACKER_INTERFACE" ] && [ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.multipathvpn)" = "1" ]); then
		if [ "$OMR_TRACKER_STATUS_MSG" = "" ]; then
			_log "$OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) switched off (interface up status: $interface_up - Tracker status: $OMR_TRACKER_STATUS)"
		else
			_log "$OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) switched off because $OMR_TRACKER_STATUS_MSG"
		fi
		if [ -n "$OMR_TRACKER_INTERFACE" ]; then
			uci -q set openmptcprouter.$OMR_TRACKER_INTERFACE.state='down'
		fi
		#if [ "$(sysctl -n net.mptcp.mptcp_enabled | tr -d '\n')" = "1" ]; then
		#	multipath "$OMR_TRACKER_DEVICE" off > /dev/null 2>&1
		#fi
		if [ -n "$OMR_TRACKER_DEVICE_IP" ]; then
			glorytun-udp path addr $OMR_TRACKER_DEVICE_IP dev tun0 set down > /dev/null 2>&1
		fi
		if [ -n "$OMR_TRACKER_DEVICE_IP6" ]; then
			glorytun-udp path addr $OMR_TRACKER_DEVICE_IP6 dev tun0 set down > /dev/null 2>&1
		fi
		if [ -n "$OMR_TRACKER_INTERFACE" ] && [ "$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.vpn)" = "1" ] && [ "$(uci -q get openmptcprouter.settings.mptcpovervpn)" = "openvpn" ]; then
			VPN_BASE_INTF="$(uci -q get openmptcprouter.$OMR_TRACKER_INTERFACE.baseintf)"
			VPN_BASE_INTF_IP=$(ubus call network.interface.$VPN_BASE_INTF status | jsonfilter -e '@["ipv4-address"][0].address' | tr -d "\n")
			if [ -n "$VPN_BASE_INTF" ]; then
				uci -q batch <<-EOF >/dev/null
					set openvpn.$VPN_BASE_INTF.local=$VPN_BASE_INTF_IP
					commit openvpn
				EOF
			fi
			[ -z "VPN_BASE_INTF" ] && VPN_BASE_INTF="omr"
			/etc/init.d/openvpn restart $VPN_BASE_INTF 2>&1 >/dev/null
		fi
		config_load openmptcprouter
		config_foreach del_server_route server
		config_foreach del_server_route6 server
		#if [ "$(uci -q get openmptcprouter.settings.master)" = "balancing" ] && [ "$(uci -q get openmptcprouter.settings.vpn)" != "mlvpn" ]; then

		if [ -n "$OMR_TRACKER_INTERFACE" ]; then
			if ([ "$default_gw" = "$OMR_TRACKER_DEVICE_GATEWAY" ] || [ "$default_gw" = "" ] || [ "$default_gw6" != "$OMR_TRACKER_DEVICE_GATEWAY6" ]) && [ "$(uci -q get openmptcprouter.settings.defaultgw)" != "0" ]; then
				[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "Default gw: $default_gw - Set routes (current: $(ip r) )"
				config_load network
				config_foreach set_route interface $OMR_TRACKER_INTERFACE
				config_foreach set_route6 interface $OMR_TRACKER_INTERFACE
				[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "New routes $(ip r)"
			elif [ "$(uci -q get network.$OMR_TRACKER_INTERFACE.multipath)" = "master" ]; then
				config_load network
				config_foreach set_route interface $OMR_TRACKER_INTERFACE "no"
				config_foreach set_route6 interface $OMR_TRACKER_INTERFACE "no"
			elif [ -n "$OMR_TRACKER_DEVICE" ] && [ -n "$(ip r show table 991337 | grep "$OMR_TRACKER_DEVICE ")" ]; then
				config_load network
				config_foreach set_route interface $OMR_TRACKER_INTERFACE "no"
				config_foreach set_route6 interface $OMR_TRACKER_INTERFACE "no"
			fi
		fi
		if [ "$(uci -q get openmptcprouter.settings.master)" = "balancing" ]; then
			[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "Set balancing route (current: $(ip r) )"
			config_foreach set_server_all_routes server
			config_foreach set_server_all_routes6 server
			[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "Set balancing route done (new: $(ip r) )"
		fi
	fi
	
	mail_alert=""
	if [ -n "$OMR_TRACKER_INTERFACE" ]; then
		mail_alert="$(uci -q get omr-tracker.$OMR_TRACKER_INTERFACE.mail_alert)"
	fi
	[ -z "$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%/$OMR_TRACKER_INTERFACE/g" -e "s/%DEVICE%/$OMR_TRACKER_DEVICE/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%/$OMR_TRACKER_INTERFACE/g" -e "s/%DEVICE%/$OMR_TRACKER_DEVICE/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: $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) is down\n\nConnection failure of $OMR_TRACKER_INTERFACE ($OMR_TRACKER_DEVICE) detected. The reason is \"$OMR_TRACKER_STATUS_MSG\"." | sendmail $(uci -q get mail.default.to)
		fi
	}
	script_alert_down=""
	if [ -n "$OMR_TRACKER_INTERFACE" ]; then
		script_alert_down="$(uci -q get omr-tracker.$OMR_TRACKER_INTERFACE.script_alert_down)"
	fi
	[ -n "$script_alert_down" ] && eval $script_alert_down

	restart_down=""
	if [ -n "$OMR_TRACKER_INTERFACE" ]; then
		restart_down="$(uci -q get omr-tracker.$OMR_TRACKER_INTERFACE.restart_down)"
	fi
	[ -z "$restart_down" ] && restart_down="$(uci -q get omr-tracker.defaults.restart_down)"
	[ "$restart_down" = "1" ] && {
		_log "Restart $OMR_TRACKER_INTERFACE"
		ifdown $OMR_TRACKER_INTERFACE 2>&1 >/dev/null
		sleep 5
		ifup $OMR_TRACKER_INTERFACE 2>&1 >/dev/null
	}

	if [ "$OMR_TRACKER_INTERFACE" = "glorytun" ] || [ "$OMR_TRACKER_INTERFACE" = "omrvpn" ] || [ "$OMR_TRACKER_INTERFACE" = "omr6in4" ]; then
		if [ "$OMR_TRACKER_STATUS_MSG" = "" ]; then
			_log "$OMR_TRACKER_INTERFACE down"
		else
			_log "$OMR_TRACKER_INTERFACE down because $OMR_TRACKER_STATUS_MSG"
		fi
		if [ "$(uci -q get openmptcprouter.settings.defaultgw)" != "0" ]; then
			config_load network
			config_foreach set_route interface $OMR_TRACKER_INTERFACE
			config_foreach set_route6 interface $OMR_TRACKER_INTERFACE
		else
			_log "Default gateway disabled, no default gateway set"
		fi
		if [ "$(uci -q get openmptcprouter.settings.shadowsocksudp)" = "1" ] && [ "$(uci -q get shadowsocks-libev.sss0.disabled)" != "1" ] && [ "$(uci -q get openmptcprouter.omr.shadowsocks)" = "up" ] && [ "$(uci -q get shadowsocks-libev.ss_rules.redir_udp)" = "" ] && [ "$(uci -q get shadowsocks-libev.hi1.mode)" = "tcp_and_udp" ] && [ "$(uci -q get shadowsocks-libev.sss0.obfs)" != "1" ]; then
			_log "Tunnel down use ShadowSocks for UDP"
			uci -q set shadowsocks-libev.ss_rules.redir_udp='hi1'
			if /etc/init.d/shadowsocks-libev rules_exist ; then
				/etc/init.d/shadowsocks-libev rules_down 2>&1 >/dev/null
				/etc/init.d/shadowsocks-libev rules_up 2>&1 >/dev/null
			fi
		fi
		if [ "$(uci -q get dsvpn.vpn.enable)" = "1" ]; then
			_log "DSVPN down, restart it"
			/etc/init.d/dsvpn restart 2>&1 >/dev/null
		fi
		if [ "$(uci -q get mlvpn.general.enable)" = "1" ]; then
			_log "MLVPN down, restart it"
			/etc/init.d/mlvpn restart 2>&1 >/dev/null
		fi
		if [ "$(uci -q get glorytun.vpn.enable)" = "1" ]; then
			_log "Glorytun VPN down, restart it"
			/etc/init.d/glorytun restart 2>&1 >/dev/null
		fi
		if [ "$(uci -q get glorytun-udp.vpn.enable)" = "1" ]; then
			_log "Glorytun UDP VPN down, restart it"
			/etc/init.d/glorytun-udp restart 2>&1 >/dev/null
		fi
		if [ "$(uci -q get openvpn.omr.enabled)" = "1" ]; then
			_log "OpenVPN down, restart it"
			/etc/init.d/openvpn restart omr 2>&1 >/dev/null
		fi
		config_load openmptcprouter
		config_foreach disable_pihole server
		#if [ "$(uci -q get openmptcprouter.settings.master)" != "balancing" ] || [ "$(uci -q get openmptcprouter.settings.vpn)" = "mlvpn" ]; then
		if [ "$(uci -q get openmptcprouter.settings.master)" != "balancing" ]; then
			config_foreach set_server_default_route server
			config_foreach set_server_default_route6 server
		fi
	fi
	dns_flush
	if [ -n "$OMR_TRACKER_INTERFACE" ]; then
		uci -q delete openmptcprouter.$OMR_TRACKER_INTERFACE.lc
	fi
	[ -n "$(uci -q changes openmptcprouter)" ] && uci -q commit openmptcprouter
	#ubus call network reload

	# Set a little sleep after an interface error
#	if [ -n "$RANDOM" ]; then
#		sleep `expr $RANDOM % 100`
#	else
#		sleep `awk 'BEGIN{srand();print int(rand()*20)}'`
#	fi

	exit 0
fi