Tweak fluash ARP function

Signed-off-by: Christian König <github@yubiuser.dev>

advanced/Scripts/piholeNetworkFlush.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# Pi-hole: A black hole for Internet advertisements
+# (c) 2019 Pi-hole, LLC (https://pi-hole.net)
+# Network-wide ad blocking via your own hardware.
+#
+# Network table flush
+#
+# This file is copyright under the latest version of the EUPL.
+# Please see LICENSE file for your rights under this license.
+
+coltable="/opt/pihole/COL_TABLE"
+if [[ -f ${coltable} ]]; then
+# shellcheck source="./advanced/Scripts/COL_TABLE"
+    source ${coltable}
+fi
+
+readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
+utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
+# shellcheck source=./advanced/Scripts/utils.sh
+source "${utilsfile}"
+
+# Source api functions
+# shellcheck source="./advanced/Scripts/api.sh"
+. "${PI_HOLE_SCRIPT_DIR}/api.sh"
+
+flushNetwork(){
+    local output
+
+    echo -ne "  ${INFO} Flushing network table ..."
+
+    local data status error
+    # Authenticate with FTL
+    LoginAPI
+
+    # send query again
+    data=$(PostFTLData "action/flush/network" "" "status")
+
+    # Separate the status from the data
+    status=$(printf %s "${data#"${data%???}"}")
+    data=$(printf %s "${data%???}")
+
+    # If there is an .error object in the returned data, display it
+    local error
+    error=$(jq --compact-output <<< "${data}" '.error')
+    if [[ $error != "null" && $error != "" ]]; then
+        echo -e "${OVER}  ${CROSS} Failed to flush the network table:"
+        echo -e "      $(jq <<< "${data}" '.error')"
+        LogoutAPI
+        exit 1
+    elif [[ "${status}" == "200" ]]; then
+        echo -e "${OVER}  ${TICK} Flushed network table"
+    fi
+
+    # Delete session
+    LogoutAPI
+}
+
+flushArp(){
+    # Flush ARP cache of the host
+    if ! output=$(ip -s -s neigh flush all 2>&1); then
+        echo -e "${OVER}  ${CROSS} Failed to flush ARP cache"
+        echo "  Output: ${output}"
+        return 1
+    fi
+}
+
+# Process all options (if present)
+while [ "$#" -gt 0 ]; do
+    case "$1" in
+    "--arp" ) doARP=true ;;
+    esac
+    shift
+done
+
+flushNetwork
+
+if [[ "${doARP}" == true ]]; then
+    echo -ne "  ${INFO} Flushing ARP cache"
+    if flushArp; then
+        echo -e "${OVER}  ${TICK} Flushed ARP cache"
+    fi
+fi
+