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#!/bin/bash
# Toggle Pi-hole DNS on/off for active network connection
set -e
# Pi-hole DNS servers on the Raspberry Pi pair, with the router as last-resort fallback.
PIHOLE_DNS="192.168.1.127 192.168.1.128 192.168.1.1"
# Colors for output
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m' # No Color
# Get active connection name (excluding loopback)
get_active_connection() {
nmcli -t -f NAME,DEVICE connection show --active | grep -v ':lo$' | head -1 | cut -d: -f1
}
# Check if Pi-hole DNS is currently enabled
is_pihole_enabled() {
local connection="$1"
local ignore_auto_dns=$(nmcli -t -f ipv4.ignore-auto-dns connection show "$connection" | cut -d: -f2)
[[ "$ignore_auto_dns" == "yes" ]]
}
# Enable Pi-hole DNS
enable_pihole() {
local connection="$1"
echo -e "${YELLOW}Enabling Pi-hole DNS for connection: $connection${NC}"
nmcli con mod "$connection" ipv4.dns "$PIHOLE_DNS"
nmcli con mod "$connection" ipv4.ignore-auto-dns yes
nmcli con up "$connection" > /dev/null 2>&1
echo -e "${GREEN}✓ Pi-hole DNS enabled${NC}"
echo "DNS servers: $PIHOLE_DNS"
}
# Disable Pi-hole DNS (use DHCP-provided DNS)
disable_pihole() {
local connection="$1"
echo -e "${YELLOW}Disabling Pi-hole DNS for connection: $connection${NC}"
nmcli con mod "$connection" ipv4.dns ""
nmcli con mod "$connection" ipv4.ignore-auto-dns no
nmcli con up "$connection" > /dev/null 2>&1
echo -e "${GREEN}✓ Pi-hole DNS disabled (using DHCP DNS)${NC}"
}
# Show current DNS status
show_status() {
local connection="$1"
echo -e "\n${YELLOW}Current DNS configuration:${NC}"
nmcli dev show | grep "IP4.DNS" | head -4
}
# Check if running on Fedora
check_os() {
if [[ ! -f /etc/fedora-release ]]; then
echo -e "${RED}Error: This script is designed for Fedora Linux only${NC}"
if [[ -f /etc/os-release ]]; then
source /etc/os-release
echo "Detected OS: $NAME"
fi
exit 1
fi
}
# Main logic
main() {
# Check OS compatibility
check_os
# Check if running as root
if [[ $EUID -eq 0 ]]; then
echo -e "${RED}Error: Do not run this script as root${NC}"
exit 1
fi
# Get active connection
CONNECTION=$(get_active_connection)
if [[ -z "$CONNECTION" ]]; then
echo -e "${RED}Error: No active network connection found${NC}"
exit 1
fi
echo "Active connection: $CONNECTION"
# Handle command-line arguments
case "${1:-toggle}" in
on|enable)
enable_pihole "$CONNECTION"
show_status "$CONNECTION"
;;
off|disable)
disable_pihole "$CONNECTION"
show_status "$CONNECTION"
;;
status)
if is_pihole_enabled "$CONNECTION"; then
echo -e "${GREEN}Pi-hole DNS is currently ENABLED${NC}"
else
echo -e "${YELLOW}Pi-hole DNS is currently DISABLED${NC}"
fi
show_status "$CONNECTION"
;;
toggle|*)
if is_pihole_enabled "$CONNECTION"; then
disable_pihole "$CONNECTION"
else
enable_pihole "$CONNECTION"
fi
show_status "$CONNECTION"
;;
esac
}
main "$@"
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