From 8f78b7350a63cc0fe2a98318fa47f8a62195fee0 Mon Sep 17 00:00:00 2001
From: Christoph <ckubu@oopen.de>
Date: Thu, 22 Nov 2018 03:01:58 +0100
Subject: [PATCH] Add script 'clean_up_arp_table.sh'.

---
 clean_up_arp_table.sh               | 220 ++++++++++++++++++++++++++++
 conf/clean_up_arp_table.conf.sample |  15 ++
 2 files changed, 235 insertions(+)
 create mode 100755 clean_up_arp_table.sh
 create mode 100644 conf/clean_up_arp_table.conf.sample

diff --git a/clean_up_arp_table.sh b/clean_up_arp_table.sh
new file mode 100755
index 0000000..d0dc7ad
--- /dev/null
+++ b/clean_up_arp_table.sh
@@ -0,0 +1,220 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+LOCK_DIR="$(mktemp -d)"
+
+log_file="${LOCK_DIR}/script_name.log"
+
+# ----------
+# Base Function(s)
+# ----------
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+
+
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
+   else
+      echo -e "   [ Fatal ] $*"
+   fi
+   echo ""
+   if $terminal ; then
+      echo -e "             \033[1mScript terminated\033[m.."
+   else
+      echo -e "             Script terminated.."
+   fi
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+warn (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[33m\033[1mWarn\033[m ]  $*"
+      else
+         echo "   [ Warn ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+info (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+      else
+         echo "   [ Info ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+ok (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mOk\033[m ]    $*"
+      else
+         echo "   [ Ok ]    $*"
+      fi
+      echo ""
+   fi
+}
+
+echo_done() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mdone\033[m ]"
+   fi
+}
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+is_number() {
+
+   return $(test ! -z "${1##*[!0-9]*}" > /dev/null 2>&1);
+
+   # - also possible
+   # -
+   #[[ ! -z "${1##*[!0-9]*}" ]] && return 0 || return 1
+   #return $([[ ! -z "${1##*[!0-9]*}" ]])
+}
+
+## - Check if a given array (parameter 2) contains a given string (parameter 1)
+## -
+containsElement () {
+   local e
+   for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
+   return 1
+}
+
+
+# ----------
+# - Jobhandling 
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+   terminal=false
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+fi
+
+
+# ----------
+#  Read Configurations from $conf_file
+# ----------
+
+if [[ -f "$conf_file" ]]; then
+   source "$conf_file"
+fi
+
+if [[ -z "$DEVICE_LIST" ]] ; then
+
+   # - Try to determine network device list
+   # -
+   DEVICE_LIST="$(/sbin/ip a | grep "^[0-9]\{1,2\}:" | awk '{print$2}' | cut -d ':' -f 1)"
+fi
+
+declare -a device_arr=()
+for _device in $DEVICE_LIST ; do
+   [[ "$_device" = "lo" ]] && continue
+
+   (/sbin/ip link set arp off dev $_device > $log_file 2>&1) && /sbin/ip link set arp on dev $_device > $log_file 2>&1
+
+   if [[ $? = 0 ]] ; then
+      ok "Cleaning up arp table for device $_device"
+   else
+      error "Cleaning up arp table for device $_device failed! \n\n$(cat "$log_file") "
+   fi
+         
+done
+
+clean_up 0
diff --git a/conf/clean_up_arp_table.conf.sample b/conf/clean_up_arp_table.conf.sample
new file mode 100644
index 0000000..4f90074
--- /dev/null
+++ b/conf/clean_up_arp_table.conf.sample
@@ -0,0 +1,15 @@
+# -------------------------------------------
+# - Settings for script clean_up_arp_table.sh
+# -------------------------------------------
+
+# - DEVICE_LIST
+# -
+# - Blank separated list of network devices
+# -
+# - Example:
+# -    DEVICE_LIST="enp0s20f1"
+# -
+# - If DEVICE_LIST is not given, script tries to determin devive list.
+# -
+#DEVICE_LIST=""
+