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luqasn/001-dnsswitcher.1d.sh

Created November 3, 2022 12:51
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  1. luqasn created this gist Nov 3, 2022.
    122 changes: 122 additions & 0 deletions 001-dnsswitcher.1d.sh
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    #!/usr/bin/env bash
    #
    # DNS Switcher
    # The list of DNS options should be defined on this file
    #
    # rewrite of https://github.com/matryer/bitbar-plugins/blob/master/Network/dnsswitcher.1d.sh
    # by M Saiqul Haq (@saiqulhaq)
    #
    # <xbar.title>DNS Switcher</xbar.title>
    # <xbar.version>v2.1.7-beta</xbar.version>
    # <xbar.author>Lucas Romero</xbar.author>
    # <xbar.author.github>luqasn</xbar.author.github>
    # <xbar.desc>Switch DNS to your defined DNS options.</xbar.desc>

    # Configuration

    # add or remove list of DNS options below, don't forget to make it enabled. see below
    # shellcheck disable=2034
    cloudflare="1.1.1.1 1.0.0.1"

    # shellcheck disable=2034
    google="8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844"

    # shellcheck disable=2034
    level3="209.244.0.3 209.244.0.4 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4"

    # shellcheck disable=2034
    opendns="208.67.222.222 208.67.220.220"

    # shellcheck disable=2034
    norton="199.85.126.10 199.85.127.10 199.85.126.20 199.85.127.20 199.85.126.30 199.85.127.30"

    localhost="127.0.0.1"

    # shellcheck disable=2034
    default="empty"

    enabled_dns_address=(default localhost)
    ########################


    get_interface() {
    while read -r line; do
    sname="$(echo "$line" | sed -E 's|(.*) \(Hardware Port: (.+), Device: (.+)\)|\1|')"
    sdev="$(echo "$line" | sed -E 's|(.*) \(Hardware Port: (.+), Device: (.+)\)|\3|')"
    if [ -n "$sdev" ]; then
    ifout="$(ifconfig "$sdev" 2>/dev/null)"
    echo "$ifout" | grep 'status: active' > /dev/null 2>&1
    rc="$?"
    if [ "$rc" -eq 0 ]; then
    echo "$sname"
    break
    fi
    fi
    done <<< "$(networksetup -listnetworkserviceorder | awk 'BEGIN { RS = "\\([0-9]\+\\) " ; FS = "\n" } { print $1, $2 }')"

    if [ -z "$currentservice" ]; then
    >&2 echo "Could not find current service"
    exit 1
    fi
    }

    flushcache(){
    killall -HUP mDNSResponder &>/dev/null
    sudo killall mDNSResponderHelper &>/dev/null
    sudo dscacheutil -flushcache &>/dev/null
    }

    selected_dns="Unknown"
    network_service="$(get_interface)"
    current_dns_output=$(networksetup -getdnsservers "$network_service")

    if [[ $current_dns_output == There* ]] # For e.g. "There aren't any DNS Servers set on Wi-Fi."
    then
    selected_dns="default"
    else
    IFS=', ' read -r -a current_dns_address <<< "$current_dns_output"

    for dns_name in "${enabled_dns_address[@]}"
    do
    for current_dns in "${current_dns_address[@]}"
    do
    dns_option="${!dns_name}"
    if [[ $dns_option == *"$current_dns"* ]]
    then
    selected_dns="$dns_name"
    fi
    done
    done
    fi

    get_interfaces
    return


    ### Bitbar Menu
    if [[ $selected_dns == "Unknown" ]]
    then
    echo "Unrecognized DNS"
    else
    echo "$selected_dns"
    fi

    echo "---"

    for dns_name in "${enabled_dns_address[@]}"
    do
    echo "$dns_name | shell=$0 | param1='${dns_name}' | terminal=false | refresh=true"
    done

    case "$0" in
    *\ * )
    echo "Your script path | color=#ff0000"
    echo "($0) | color=#ff0000"
    echo "has a space in it, which BitBar does not support. | color=#ff0000"
    ;;
    esac

    if [ ! -z "$1" ]; then
    networksetup -setdnsservers "$network_service" ${!1}
    /usr/bin/osascript -e "do shell script \"flushcache\" with prompt \"DNS caches should be flushed after switching servers.\" with administrator privileges"
    fi