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#!/bin/sh

if ! ping -c 3 對方wgIP 3 > /dev/null 2>&1 ;then

echo "The Wireguard is down! Now try restarting wg0!\n" >> ./ddns-wg0.log

ifdown wg0 #wg0是你的wg接口名稱
sleep 3
ifup wg0
fi

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. /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}'):1/128 Scope:Host

  # 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,\}\)"80: b91d/128 Scope:Link
  local IPV4=$(echo ${endpoint_host} | grep -m 1 -o "$IPV4_REGEX$")    # do not detect ip in 0.0.0.0.example.comrors:0 dropped:3224 overruns:0 frame:0
  local IPV6=$(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}')6 addr: fe80::ded8:7cff:fe40:7c82/64 Scope:Link
  [ -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}"00  
}

# 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

1

   * * * * * /usr/bin/wireguard_watchdog