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authorAleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com>2018-07-01 15:40:31 +0300
committerKevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>2018-07-22 21:52:20 +0100
commit20c4819c7baf6f9b91420849caf30e5137bd75d6 (patch)
treec3d34348936ceae6f750b0e53fab22d7af710844 /package/network/services/wireguard/files
parent2dcd955aea1ab715d048910322b05d1af0b69748 (diff)
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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>
Diffstat (limited to 'package/network/services/wireguard/files')
-rw-r--r--package/network/services/wireguard/files/wireguard_watchdog60
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