tunnel() {
    TUNNEL_TYPE=""
    TUNNEL_ENDPOINT=""
    TUNNEL_ARGS=""

    case $1 in
        http|https)
            TUNNEL_TYPE="-R"
            TUNNEL_ENDPOINT="$([[ $1 == "http" ]] && echo "80" || echo "443"):"

            if [ -z $2 ]; then
                echo "Tunnel provided incorrect port. Usage: tunnel $1 <port>"
                return
            fi

            if [ ! -z $3 ]; then
                TUNNEL_ENDPOINT="$3:${TUNNEL_ENDPOINT}"
            fi

            LOCAL_PORT=$2
            if [[ $LOCAL_PORT != *":"* ]]; then
                LOCAL_PORT="localhost:$2"
            fi

            TUNNEL_ENDPOINT+="$LOCAL_PORT"
            echo "Starting ${1^^} tunnel to $LOCAL_PORT"
            ;;
        tcp)
            TUNNEL_TYPE="-R"
            TUNNEL_ENDPOINT="${3:-0}:"

            if [ -z $2 ]; then
                echo "Tunnel provided incorrect port. Usage: tunnel $1 <port>"
                return
            fi

            LOCAL_PORT=$2
            if [[ $LOCAL_PORT != *":"* ]]; then
                LOCAL_PORT="localhost:$2"
            fi

            TUNNEL_ENDPOINT+="$LOCAL_PORT"
            echo "Starting ${1^^} tunnel to $LOCAL_PORT"
            ;;
        *)
            echo "unknown tunnel"
            return
            ;;
    esac

    ssh $TUNNEL_TYPE $TUNNEL_ENDPOINT tuns.sh $TUNNEL_ARGS
}