ipt function for safe importing of rulesets

gistfile1.sh

# setup for easy management of iptables
function ipt {
    if [[ "$1" == "clear" ]]; then
        print -P "\e[95mFlushing firewall and allowing everyone...\n"
        sudo iptables -F
        sudo iptables -X
        sudo iptables -t nat -F
        sudo iptables -t nat -X
        sudo iptables -t mangle -F
        sudo iptables -t mangle -X
        sudo iptables -P INPUT ACCEPT
        sudo iptables -P FORWARD ACCEPT
        sudo iptables -P OUTPUT ACCEPT
        print -P "\e[0;32mDone!"
    elif [ -e "$1" ]; then
        # Here we setup a fall back where we flush the rules if the user locks themselves out!
        # The first sleep is to allow time for the rules to be loaded, the second is the wait.
        # We expect them to ^C out of this if everything is fine.
        if  [ -n "$TMUX" -o -n "$STY" ]; then # checking for presence in a virtual terminal
            FLUSH_WAIT=10
            print -P "\e[95mImporting rules into kernel...\e[0m\n"
            sudo iptables-restore < "$1"
            sleep 1s
            print -P "\e[0;33mIf you can see this, *push ^C*, if not, flushing rules in $FLUSH_WAIT seconds.\n"
            sleep $FLUSH_WAIT
            $0 clear
        else
            print -P "\e[0;91mYou are not in a virtual terminal (e.g. screen or tmux)! Please enter one before importing iptables rules (for your own safety)."
        fi
    else
        print -P "Usage: $0 [clear (flush all rules, allow all!) | <file> (provide file to load into iptables]\nNote your sudo timer (by default 5m) must be longer than the time we wait to flush rules if something happens or else we wont be able to clear out the firewall if you get locked out!\nThis script can be used withOUT being root!"
    fi
}