wireguard-tools/contrib/reresolve-dns/reresolve-dns.sh

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#!/bin/bash
set -e
shopt -s nocasematch
shopt -s extglob
export LC_ALL=C
CONFIG_FILE="$1"
[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]]
INTERFACE="${BASH_REMATCH[1]}"
process_peer() {
[[ $PEER_SECTION -ne 1 || -z $PUBLIC_KEY || -z $ENDPOINT ]] && return 0
[[ $(wg show "$INTERFACE" latest-handshakes) =~ ^${PUBLIC_KEY//+/\\+}\ ([0-9]+)$ ]] || return 0
(( ($(date +%s) - ${BASH_REMATCH[1]}) > 135 )) || return 0
wg set "$INTERFACE" peer "$PUBLIC_KEY" endpoint "$ENDPOINT"
reset_peer_section
}
reset_peer_section() {
PEER_SECTION=0
PUBLIC_KEY=""
ENDPOINT=""
}
reset_peer_section
while read -r line || [[ -n $line ]]; do
key="${line%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}"
value="${line#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}"
[[ $key == "["* ]] && { process_peer; reset_peer_section; }
[[ $key == "[Peer]" ]] && PEER_SECTION=1
if [[ $PEER_SECTION -eq 1 ]]; then
case "$key" in
PublicKey) PUBLIC_KEY="$value"; continue ;;
Endpoint) ENDPOINT="$value"; continue ;;
esac
fi
done < "$CONFIG_FILE"
process_peer