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