2 # SPDX-License-Identifier: GPL-2.0
4 # Copyright (C) 2018 Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com>.
5 # Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
7 # This watchdog script tries to re-resolve hostnames for inactive WireGuard peers.
8 # Use it for peers with a frequently changing dynamic IP.
9 # persistent_keepalive must be set, recommended value is 25 seconds.
11 # Run this script from cron every minute:
12 # echo '* * * * * /usr/bin/wireguard_watchdog' >> /etc/crontabs/root
17 check_peer_activity
() {
23 local persistent_keepalive
27 config_get public_key
"${cfg}" "public_key"
28 config_get endpoint_host
"${cfg}" "endpoint_host"
29 config_get endpoint_port
"${cfg}" "endpoint_port"
30 persistent_keepalive
=`wg show ${iface} persistent-keepalive | grep ${public_key} | awk '{print $2}'`
32 # only process peers with endpoints and keepalive set
33 [ -z ${endpoint_host} ] && return 0;
34 [ -z ${persistent_keepalive} -o ${persistent_keepalive} = "off" ] && return 0;
37 # check taken from packages/net/ddns-scripts/files/dynamic_dns_functions.sh
38 local IPV4_REGEX
="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
39 local IPV6_REGEX
="\(\([0-9A-Fa-f]\{1,4\}:\)\{1,\}\)\(\([0-9A-Fa-f]\{1,4\}\)\{0,1\}\)\(\(:[0-9A-Fa-f]\{1,4\}\)\{1,\}\)"
40 local IPV4
=$
(echo ${endpoint_host} |
grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com
41 local IPV6
=$
(echo ${endpoint_host} |
grep -m 1 -o "$IPV6_REGEX")
42 [ -n "${IPV4}" -o -n "${IPV6}" ] && return 0;
44 # re-resolve endpoint hostname if not responding for too long
45 last_handshake
=`wg show ${iface} latest-handshakes | grep ${public_key} | awk '{print $2}'`
46 [ -z ${last_handshake} ] && return 0;
47 idle_seconds
=$
((`date +%s`-${last_handshake}))
48 [ ${idle_seconds} -lt 150 ] && return 0;
49 logger
-t "wireguard_monitor" "${iface} endpoint ${endpoint_host}:${endpoint_port} is not responding for ${idle_seconds} seconds, trying to re-resolve hostname"
50 wg
set ${iface} peer ${public_key} endpoint "${endpoint_host}:${endpoint_port}"
53 # query ubus for all active wireguard interfaces
54 wg_ifaces=`ubus -S call network.interface dump | jsonfilter -e '@.interface[@.up=true]' | jsonfilter -a -e '@[@.proto="wireguard
"].interface' | tr "\n" " "`
56 # check every peer in every active wireguard interface
58 for iface in $wg_ifaces; do
59 config_foreach check_peer_activity "wireguard_
${iface}" "${iface}"