check_dns.sh: redesign

check_vpn.sh: redisign
check_postfix.sh: Add support for Debian 9 (stretch).

check_dns.sh

@@ -1,20 +1,187 @@
 #!/usr/bin/env bash
 
-PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+check_string_ps=""
+if [[ -f "/usr/sbin/named" ]] ; then
+	check_string_ps="/usr/sbin/named"
+fi
 
 alternate_addr="oopen.de google.com heise.de debian.org ubuntu.com"
 
+
+# - used, if systemd is NOT supported
+bind_init_script=""
+if [[ -x "/etc/init.d/bind9" ]] ; then
+   bind_init_script="/etc/init.d/bind9"
+fi
+
+# - Used if systemd is supported
+# -
+service_name=bind9
+
+LOCK_DIR=`mktemp -d`
+
+
+#---------------------------------------
+#-----------------------------
+# Base Function(s)
+#-----------------------------
+#---------------------------------------
+
+fatal(){
+   echo ""
+   echo -e "   [ Fatal ] $*"
+   echo ""
+   echo -e "\tScript terminated.."
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+
+error (){
+   echo ""
+   echo -e "   [ Error ] $*"
+   echo ""
+}
+
+warn (){
+   echo ""
+   echo -e "   [ Warn ]  $*"
+   echo ""
+}
+
+info (){
+   echo ""
+   echo -e "   [ Info ]  $*"
+   echo ""
+}
+
+ok (){
+   echo ""
+   echo -e "   [ Ok ]    $*"
+   echo ""
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+
+#---------------------------------------
+#-----------------------------
+# Check some prerequisites
+#-----------------------------
+#---------------------------------------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+      terminal=true
+      LOGGING=true
+else
+   terminal=false
+   LOGGING=false
+fi
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+      terminal=true
+      LOGGING=true
+else
+   terminal=false
+   LOGGING=false
+fi
+
+if [[ -z $check_string_ps ]]; then
+   fatal "$(basename $0): Bind Nameservice seems NOT to be installed"
+fi
+
+# - Systemd supported ?
+# -
+systemd=$(which systemd)
+systemctl=$(which systemctl)
+
+systemd_supported=false
+if [[ -n "$systemd" ]] && [[ -n "$systemctl" ]] ; then
+   systemd_supported=true
+else
+   if [[ ! -x $bind_init_script ]]; then
+      fatal "$(basename $0): Missing Bind Init-Script!"
+   fi
+fi
+
+
+#---------------------------------------
+#-----------------------------
+# Check if Bind Nameservice is running
+#-----------------------------
+#---------------------------------------
+
+if $LOGGING ; then
+   echo -e "\n   Check if Bind Nameservice is running.."
+   echo -e "   ======================================"
+fi
+
 for ip_addr in $alternate_addr  ; do
-   ping -c3 $ip_addr >/dev/null 2> /dev/null
+   ping -c3 $ip_addr >> /dev/null 2>&1
    if [ $? -eq 0 ]; then
-      exit 0
+
+      PID=$(ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}"| grep -v grep | awk '{print$2}')
+      if [[ "X${PID}" = "X" ]]; then
+         break
+      else
+      
+         if $LOGGING ; then
+            ok "Bind Nameservice is up and running."
+         fi
+         exit 0
+      fi
    fi
 done;
 
-/etc/init.d/bind9 restart
+error "Bind Nameservice seems to be down! Trying to restart service now.."
 
-echo ""
-echo "[ Info ]: Restartet Nameservice bind on host `hostname --long` at `date +\"%d.%m.%Y %H:%M:%S\"`"
-echo ""
+if $systemd_supported ; then
+	$systemctl stop $service_name > /dev/null 2> ${LOCK_DIR}/err_msg.log
+	if [[ $? -ne 0 ]]; then
+		error "$(cat ${LOCK_DIR}/err_msg.log)"
+	fi
+	sleep 10
+	$systemctl start $service_name > /dev/null 2> ${LOCK_DIR}/err_msg.log
+	if [[ $? -ne 0 ]]; then
+		error "$(cat ${LOCK_DIR}/err_msg.log)"
+	fi
+else
+	$bind_init_script stop > /dev/null 2>&1
+	if [[ $? -ne 0 ]]; then
+		error "Stopping Bind Nameservice failed!"
+	fi
+	sleep 10
+	$bind_init_script start > /dev/null 2>&1
+	if [[ $? -ne 0 ]]; then
+		error "Starting Bind Nameservice failed!"
+	fi
+fi
+
+declare -i counter=0
+PID=$(ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}"| grep -v grep | awk '{print$2}')
+while [[ "X${PID}" = "X" ]]; do
+	sleep 1
+	PID=$(ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}"| grep -v grep | awk '{print$2}')
+	if [[ $counter -gt 10 ]]; then
+		break
+	else
+		((counter++))
+	fi
+done
+
+if [[ "X${PID}" = "X" ]] ; then
+	error "Restarting Bind Nameservice failed!"
+else
+	ok "Bind Nameservice is up and running."
+fi
    
 exit 0;