UESPWiki:Scripts/uesp-removeip-denyhosts

#!/bin/sh

DENYHOST_SERVICE="/etc/init.d/denyhosts"
DENYHOST_PATH="/usr/share/denyhosts"
HOSTS_DENY="/etc/hosts.deny"

function removeipfile() {
        file="$1"
        ipaddress="$2"

        if [ ! -f $file ]; then
                echo "Error: File '$file' does not exist!"
                return
        fi

        grep "$ipaddress" "$file"

        if [[ $? -ne 0 ]]; then
                echo "Warning: Address '$ipaddress' not found in file '$file'!"
                return
        fi

        sed -i "/$ipaddress/d" $file

        if [[ $? -ne 0 ]]; then
                echo "Warning: Failed to remove address '$ipaddress' from file '$file'!"
        fi

        echo "Removed address '$ipaddress' from '$file'..."
}

function removeip() {
        ipaddress="$1"

        if ! [[ $ipaddress =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
                echo "Error: '$ipaddress' is not a valid IP address!"
                return
        fi

        removeipfile $HOSTS_DENY $ipaddress
        removeipfile "$DENYHOST_PATH/data/hosts" $ipaddress
        removeipfile "$DENYHOST_PATH/data/hosts-restricted" $ipaddress
        removeipfile "$DENYHOST_PATH/data/hosts-root" $ipaddress
        removeipfile "$DENYHOST_PATH/data/hosts-valid" $ipaddress
        removeipfile "$DENYHOST_PATH/data/users-hosts" $ipaddress

}

if [[ $# -le 0 ]]; then
        echo "Error: Missing one or more input IP addresses!"
        echo "       Command format: uesp-removeip-denyhost <ipaddress>"
        exit 2
fi

$DENYHOST_SERVICE stop

if [[ $? -ne 0 ]]; then
        echo "Warning: Failed to stop the denyhosts service!"
fi

for ipaddress in "$@"
do
        removeip $ipaddress
done


$DENYHOST_SERVICE start

if [[ $? -ne 0 ]]; then
        echo "Error: Failed to restart the denyhosts service!"
        exit 1
fi

echo "Successfully restarted the denyhosts service."