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author | Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com> | 2018-07-01 15:40:31 +0300 |
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committer | Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk> | 2018-07-25 11:23:35 +0100 |
commit | f91a0f3b1aba95bcf3b248e02a89709ce0274fa7 (patch) | |
tree | 88791075a47a725ef05066ea705f148848250386 /package/network/services/wireguard/files/wireguard_watchdog | |
parent | f1dbfa193768993e0c00faf9ca62e33c23f32938 (diff) | |
download | upstream-f91a0f3b1aba95bcf3b248e02a89709ce0274fa7.tar.gz upstream-f91a0f3b1aba95bcf3b248e02a89709ce0274fa7.tar.bz2 upstream-f91a0f3b1aba95bcf3b248e02a89709ce0274fa7.zip |
wireguard-tools: add wireguard_watchdog script
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
Signed-off-by: Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com>
[bump the package release]
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(cherry picked from commit 20c4819c7baf6f9b91420849caf30e5137bd75d6)
Diffstat (limited to 'package/network/services/wireguard/files/wireguard_watchdog')
-rw-r--r-- | package/network/services/wireguard/files/wireguard_watchdog | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/package/network/services/wireguard/files/wireguard_watchdog b/package/network/services/wireguard/files/wireguard_watchdog new file mode 100644 index 0000000000..5fbbeafec1 --- /dev/null +++ b/package/network/services/wireguard/files/wireguard_watchdog @@ -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 |