Copy dhcp.leases to /etc/hosts on OpenWrt for AdGuard Home

dhcp2hosts.sh

#!/bin/bash
# converts /tmp/dhcp.leases to /etc/hosts format for adguardhome to show hostnames

# Paths to the files
HOSTS_FILE="/etc/hosts"
DHCP_LEASES_FILE="/tmp/dhcp.leases"
TEMP_FILE="/tmp/dhcp_hosts.tmp"

sed '/### DHCP LEASES START ###/,/### DHCP LEASES END ###/d' $HOSTS_FILE > $TEMP_FILE
mv $TEMP_FILE $HOSTS_FILE

echo "### DHCP LEASES START ###" >> $HOSTS_FILE
awk '{print $3 " " $4}' $DHCP_LEASES_FILE >> $HOSTS_FILE
echo "### DHCP LEASES END ###" >> $HOSTS_FILE