|
@@ -0,0 +1,60 @@
|
|
|
+#!/bin/sh
|
|
|
+# SPDX-License-Identifier: GPL-2.0
|
|
|
+#
|
|
|
+# Copyright (C) 2018 Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com>.
|
|
|
+# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
|
+#
|
|
|
+# This watchdog script tries to re-resolve hostnames for inactive WireGuard peers.
|
|
|
+# Use it for peers with a frequently changing dynamic IP.
|
|
|
+# persistent_keepalive must be set, recommended value is 25 seconds.
|
|
|
+#
|
|
|
+# Run this script from cron every minute:
|
|
|
+# echo '* * * * * /usr/bin/wireguard_watchdog' >> /etc/crontabs/root
|
|
|
+
|
|
|
+
|
|
|
+. /lib/functions.sh
|
|
|
+
|
|
|
+check_peer_activity() {
|
|
|
+ local cfg=$1
|
|
|
+ local iface=$2
|
|
|
+ local public_key
|
|
|
+ local endpoint_host
|
|
|
+ local endpoint_port
|
|
|
+ local persistent_keepalive
|
|
|
+ local last_handshake
|
|
|
+ local idle_seconds
|
|
|
+
|
|
|
+ config_get public_key "${cfg}" "public_key"
|
|
|
+ config_get endpoint_host "${cfg}" "endpoint_host"
|
|
|
+ config_get endpoint_port "${cfg}" "endpoint_port"
|
|
|
+ persistent_keepalive=`wg show ${iface} persistent-keepalive | grep ${public_key} | awk '{print $2}'`
|
|
|
+
|
|
|
+ # only process peers with endpoints and keepalive set
|
|
|
+ [ -z ${endpoint_host} ] && return 0;
|
|
|
+ [ -z ${persistent_keepalive} -o ${persistent_keepalive} = "off" ] && return 0;
|
|
|
+
|
|
|
+ # skip IP addresses
|
|
|
+ # check taken from packages/net/ddns-scripts/files/dynamic_dns_functions.sh
|
|
|
+ local IPV4_REGEX="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
|
|
|
+ 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,\}\)"
|
|
|
+ local IPV4=$(echo ${endpoint_host} | grep -m 1 -o "$IPV4_REGEX$") # do not detect ip in 0.0.0.0.example.com
|
|
|
+ local IPV6=$(echo ${endpoint_host} | grep -m 1 -o "$IPV6_REGEX")
|
|
|
+ [ -n "${IPV4}" -o -n "${IPV6}" ] && return 0;
|
|
|
+
|
|
|
+ # re-resolve endpoint hostname if not responding for too long
|
|
|
+ last_handshake=`wg show ${iface} latest-handshakes | grep ${public_key} | awk '{print $2}'`
|
|
|
+ [ -z ${last_handshake} ] && return 0;
|
|
|
+ idle_seconds=$((`date +%s`-${last_handshake}))
|
|
|
+ [ ${idle_seconds} -lt 150 ] && return 0;
|
|
|
+ logger -t "wireguard_monitor" "${iface} endpoint ${endpoint_host}:${endpoint_port} is not responding for ${idle_seconds} seconds, trying to re-resolve hostname"
|
|
|
+ wg set ${iface} peer ${public_key} endpoint "${endpoint_host}:${endpoint_port}"
|
|
|
+}
|
|
|
+
|
|
|
+# query ubus for all active wireguard interfaces
|
|
|
+wg_ifaces=`ubus -S call network.interface dump | jsonfilter -e '@.interface[@.up=true]' | jsonfilter -a -e '@[@.proto="wireguard"].interface' | tr "\n" " "`
|
|
|
+
|
|
|
+# check every peer in every active wireguard interface
|
|
|
+config_load network
|
|
|
+for iface in $wg_ifaces; do
|
|
|
+ config_foreach check_peer_activity "wireguard_${iface}" "${iface}"
|
|
|
+done
|