Reverse SSH

#!/bin/bash
varSSHPORT=''
varHTTPPORT=''
varHTTPSPORT=''
varHOST=''
varLOG=""
fnSSH ()    {
        varCHECK="$(ps aux  | grep 0.0.0.0:$varSSHPORT | grep -v 'grep')"
        echo $varCHECK
        if [[ -z $varCHECK ]]; then
            unset varDATE; fnTIMESTAMP
            ssh -N -R 0.0.0.0:$varSSHPORT:localhost:22 $varHOST & echo "$1 $! $varDATE" >> $varLOG
        fi
        unset varCHECK
        exit
        }
fnHTTP ()   {
        varCHECK="$(ps aux  | grep 0.0.0.0:$varHTTPPORT | grep -v 'grep')"
        echo $varCHECK
        if [[ -z $varCHECK ]]; then
            unset varDATE; fnTIMESTAMP
            ssh -N -R 0.0.0.0:$varHTTPPORT:localhost:80 $varHOST & echo "$1 $! $varDATE" >> $varLOG
        fi
        unset varCHECK
        exit
        }
fnHTTPS ()  {
        varCHECK="$(ps aux  | grep 0.0.0.0:$varHTTPSPORT | grep -v 'grep')"
        echo $varCHECK
        if [[ -z $varCHECK ]]; then
            unset varDATE; fnTIMESTAMP
            ssh -N -R 0.0.0.0:$varHTTPSPORT:localhost:443 $varHOST & echo "$1 $! $varDATE" >> $varLOG
        fi
        unset varCHECK
        exit
        }
fnCHECK ()  {
        ps aux | grep -v grep | grep --color=auto -E "(0.0.0.0:$varSSHPORT|0.0.0.0:$varHTTPPORT|0.0.0.0:$varHTTPSPORT|PID)"
        }
fnTIMESTAMP ()  {
        varDATE="$(date --rfc-3339=seconds)"
        }

fnKILL ()   {
        if [[ $1 = "all" ]]; then
            unset arKILL
            arKILL+=($(fnCHECK | grep -v PID | awk '{print $2}'))
            if [[ ${#arKILL[@]} -ge 1 ]]; then
                for i in ${arKILL[@]}; do
                    kill -9 $i
                done
            fi
        elif [[ $1 = "ssh" ]]; then
            unset varKILL
            varKILL="$(ps aux | grep -v grep | grep $varSSHPORT | awk '{print $2}')"
            if [[ ! $varKILL = "" ]]; then
                kill -9 $varKILL
                exit
            fi
            exit
        elif [[ $1 = "http" ]]; then
            unset varKILL
            varKILL="$(ps aux | grep -v grep | grep $varHTTPPORT | awk '{print $2}')"
            if [[ ! $varKILL = "" ]]; then
                kill -9 $varKILL
                exit
            fi
            exit
        elif [[ $1 = "https" ]]; then
            unset varKILL
            varKILL="$(ps aux | grep -v grep | grep $varHTTPSPORT | awk '{print $2}')"
            if [[ ! $varKILL = "" ]]; then
                kill -9 $varKILL
                exit
            fi
            exit
        fi
        }

if [[ -n $1 ]]; then
    if [[ $1 = "ssh" ]]; then
        fnSSH $1
        exit
    elif [[ $1 = "http" ]]; then
        fnHTTP $1
        exit
    elif [[ $1 = "https" ]]; then
        fnHTTPS $1
        exit
    elif [[ $1 = "check" ]]; then
        fnCHECK $1
        exit
    elif [[ $1 = "date" ]]; then
        fnTIMESTAMP $1
        exit
    elif [[ $1 = "kill" ]]; then
        if [[ -z $2 ]]; then
            echo -e "Need argument. Valid Responses are:\nall\nssh\nhttp\nhttps"
        elif [[ $2 = "all" ]]; then
            fnKILL $2
            exit
        elif [[ $2 = "ssh" ]]; then
            fnKILL $2
            exit
        elif [[ $2 = "http" ]]; then
            fnKILL $2
            exit
        elif [[ $2 = "https" ]]; then
            fnKILL $2
            exit
        else
            echo -e "Valid Responses are:\nall\nssh\nhttp\nhttps"
            exit
        fi
    else
        echo -e "Valid entries are:\nhttp\nhttps\nssh\ncheck\ndate\nkill"
    fi
    else
        echo "I need an argument"
        exit
fi
exit