Installation of dnsmasq macOS Ventura 13.3.1 (a). Requires sudo

dnsmasq.sh

#!/bin/bash
set -e

COLOUR_GREEN="\033[0;32m"
COLOUR_RED="\033[0;31m"
COLOUR_OFF='\033[0m'

function echo_success {
    echo -e "${COLOUR_GREEN}$1${COLOUR_OFF}"
}

function echo_failure {
    echo -e "${COLOUR_RED}$1${COLOUR_OFF}"
}

function install_dnsmasq {
    if ! brew list dnsmasq &> /dev/null; then
        echo "Installing dnsmasq"
        brew install dnsmasq
    fi

    if ! grep "^conf-dir=$(brew --prefix)/etc/dnsmasq.d" $(brew --prefix)/etc/dnsmasq.conf 1> /dev/null; then
        echo "conf-dir=$(brew --prefix)/etc/dnsmasq.d" >> $(brew --prefix)/etc/dnsmasq.conf
    fi
    
    if [ ! -d "$(brew --prefix)/etc/dnsmasq.d" ]; then
        mkdir -p $(brew --prefix)/etc/dnsmasq.d
    fi

    if ! grep -R ".test" $(brew --prefix)/etc/dnsmasq.d 1> /dev/null; then
        echo "address=/.test/127.0.0.1" >> $(brew --prefix)/etc/dnsmasq.d/test-tld
    fi
    
    sudo brew services start dnsmasq

    echo "Configuring resolver"
    if [ ! -d "/etc/resolver" ]; then
        TEMP_DIR=`mktemp -d`
        mkdir -p $TEMP_DIR/resolver
        echo "nameserver 127.0.0.1" >> $TEMP_DIR/resolver/test
        sudo cp -R "${TEMP_DIR}/resolver" /etc/
        rm -rf $TEMP_DIR/resolver/
    fi

    dnsmasq_validate &> /dev/null
    echo_success "Installed and validated dnsmasq."
}

function dnsmasq_uninstall {
    if brew list dnsmasq &> /dev/null; then
        echo "Stopping dnsmasq service."
        sudo brew services stop dnsmasq &> /dev/null

        echo "Uninstalling dnsmasq"
        if ! brew remove dnsmasq &> /dev/null; then
            echo_failure "Brew removal failed; manually removing..."
            sudo rm -rf /opt/homebrew/Cellar/dnsmasq/*
        fi
    fi

    echo "Cleaning up dnsmasq config"
    rm -rf $(brew --prefix)/etc/dnsmasq.*

    echo "Cleaning up resolver config"
    sudo rm -rf /etc/resolver

    echo_success "Uninstallation of dnsmasq completed successfully."
}

function dnsmasq_validate {
    if ! dig +short +time=1 +tries=1 local.test @127.0.0.1 &> /dev/null; then
        echo_failure "Local DNS is not responding to queries for *.test"
        exit 1
    fi

    echo_success "Local DNS is responding to queries for *.test"
}

case "$1" in

  install)
    install_dnsmasq
    ;;

  uninstall)
    dnsmasq_uninstall
    ;;

  validate)
    dnsmasq_validate
    ;;
  *)
    echo "This script will install and configure dnsmasq to redirect all DNS look ups for .test domains to localhost.
One of the following arguments must be provided; 
    - install
    - uninstall
    - validate
"
    ;;
esac