#!/usr/bin/env bash
{
    l_output="" l_output2=""
    l_mname="dccp" # set module name
    # Check if the module exists on the system
    if
        [ -z "$(modprobe -n -v "$l_mname" 2>&1 | grep -Pi -- "\h*modprobe:\h+FATAL:\h+Module\h+$l_mname\h+not\h+found\h+in\h+directory")" ]
    then
        # Check how module will be loaded
        l_loadable="$(modprobe -n -v "$l_mname")"
        [ "$(wc -l <<<"$l_loadable")" -gt "1" ] && l_loadable="$(
            grep -P -- "(^\h*install|\b$l_mname)\b" <<<"$l_loadable" )"
        if grep -Pq -- '^\h*install \/bin\/(true|false)' <<<"$l_loadable"; then
            l_output="$l_output\n - module: \"$l_mname\" is not loadable: \"$l_loadable\""
        else
            l_output2="$l_output2\n - module: \"$l_mname\" is loadable: \"$l_loadable\""
        fi
        # Check is the module currently loaded
        if ! lsmod | grep "$l_mname" >/dev/null 2>&1; then
            l_output="$l_output\n - module: \"$l_mname\" is not loaded"
        else
            l_output2="$l_output2\n - module: \"$l_mname\" is loaded"
        fi
        # Check if the module is deny listed
        if modprobe --showconfig | grep -Pq -- "^\h*blacklist\h+$(tr '-' '_' <<<"$l_mname" )\b"; then
            l_output="$l_output\n - module: \"$l_mname\" is deny listed in: \"$(grep -Pl -- "^\h*blacklist\h+$l_mname\b" /etc/modprobe.d/*)\""
        else
            l_output2="$l_output2\n - module: \"$l_mname\" is not deny listed"
        fi
    else
        l_output="$l_output\n - Module \"$l_mname\" doesn't exist on the system"
    fi
    # Report results. If no failures output in l_output2, we pass
    if [ -z "$l_output2" ]; then
        echo -e "\n- Audit Result:\n ** PASS **\n$l_output\n"
    else
        echo -e "\n- Audit Result:\n ** FAIL **\n - Reason(s) for audit failure:\n$l_output2\n"
        [ -n "$l_output" ] && echo -e "\n- Correctly set:\n$l_output\n"
    fi
}
