#!/bin/sh
set -e

# Quick and dirty command line interface for the most useful commands

# Show help for this script
usage () {
        echo "$(basename "${0}") - Helper script for the CGHMN"
        echo ""
        echo "Usage: $(basename "${0}") <command> [<args>]"
        echo ""
        echo "Available commands:"
        echo "    help                 Show this help"
        echo "    coninfo              Show info required to connect to the CGHMN"
        echo "    toggle-ppp-internet  Toggle internet access for PPP clients on or off"
        echo ""
}

# Show info required to connect to the CGHMN
coninfo () {
        MY_WG_PUBKEY="$(uci get network.cghmnd_wg.private_key | wg pubkey)"
        ETH0_MAC="$(ip link show eth0 | awk '/link\/ether/{ print $2 }')"

        echo "[> The following information is required or at least helpful to know when connecting to the CGHMN <]"
        echo ""
        echo "My primary Ethernet address:  ${ETH0_MAC}"
        echo "My Wireguard public key:      ${MY_WG_PUBKEY}"
        echo -n "My Wireguard IP addresses:    "
        for IP in $(uci get network.cghmnd_wg.addresses); do
                echo -ne "${IP}\n                              "
        done
        echo ""
}

toggle_ppp_internet () {
        PPP_FOWARD_ID="$(uci show firewall.@forwarding[] | awk -F. "/src='ppp_client'/{ print \$2 }")"

        if uci -d ";" get "firewall.${PPP_FOWARD_ID}.dest" | grep -qE '^wan;|;wan;|;wan$'; then
                uci del_list firewall."${PPP_FOWARD_ID}".dest='wan'
                echo "OK, internet is now OFF for PPP clients"
        else
                uci add_list firewall."${PPP_FOWARD_ID}".dest='wan'
                echo "OK, internet is now ON for PPP clients"
        fi
}

# Parse command selector
case "${1}" in
        -h|--help|help|"")
                usage
                ;;
        coninfo)
                coninfo
                ;;
        toggle-ppp-internet)
                toggle_ppp_internet
                ;;
        *)
                echo "Unknown command '${1}'"
                echo ""
                usage
                exit 1
esac