File rcnagios of Package nagios

#! /bin/sh
# Copyright (c) 1995-2001 SuSE GmbH Nuernberg, Germany.
#                    2002 SuSE Linux AG Nuernberg, Germany.
#                    2007 SuSE Linux GmbH Nuernberg, Germany.
#                    2010-2012 SUSE LINUX Products GmbH, Nuernberg, Germany
#
# Author: Wolfgang Rosenauer, Lars Vogdt
# 
#
# /etc/init.d/nagios
#
#   and symbolic its link
#
# /usr/sbin/rcnagios
#
# System startup script for nagios
#
### BEGIN INIT INFO
# Provides: 	  nagios monitoring_daemon
# Required-Start: $local_fs $remote_fs $syslog $network 
# Required-Stop:  $local_fs $remote_fs $syslog $network
# Should-Start:   $time sendmail httpd2 xntpd $named cron ndo2db
# Should-Stop:    sendmail ndo2db
# Default-Start:  3 5
# Default-Stop:   0 1 2 6
# Short-Description: Network monitor Nagios
# Description:    Starts and stops the Nagios monitor
#	used to provide network services status for hosts,
#	services and networks.
### END INIT INFO

. /etc/rc.status

NAGIOS_BIN='/usr/sbin/nagios'
NAGIOS_CFG='/etc/nagios/nagios.cfg'
NAGIOS_PIDFILE='/var/run/nagios/nagios.pid'
NAGIOS_SYSCONFIG='/etc/sysconfig/nagios'
NAGIOS_CFG_ERR_LOG='/var/log/nagios/config.err'
NAGIOS_DAEMONCHK='/usr/lib/nagios/cgi/daemonchk.cgi'

# Read config and log errors in logfile
config_check () {
    case "$1" in
        verbose)
            $NAGIOS_BIN -v "$NAGIOS_CFG" >"$NAGIOS_CFG_ERR_LOG" 2>&1
            if [ $? -eq 0 ]; then
                return 0
            else
                return 1
            fi
        ;;
        *)   
            $NAGIOS_BIN -v "$NAGIOS_CFG" >/dev/null 2>&1
            if [ $? -eq 0 ]; then
                return 0
            else
                $NAGIOS_BIN -v "$NAGIOS_CFG" >"$NAGIOS_CFG_ERR_LOG" 2>&1
                return 1
            fi
        ;;
    esac
}

# grab a config option 
get_var() {
	if [ -n "$2" ]; then
		set -- `grep ^$1 $2 | sed 's@=@ @' | tr -d '[:cntrl:]'`
	else
		set -- `grep ^$1 "$NAGIOS_CFG" | sed 's@=@ @' | tr -d '[:cntrl:]'`
	fi
	shift # remove first ARG => search-string
	echo $*
}

# check some default files and directories
check_files() {
    # remove some perhaps left over files 	
    for file in "$command_file" "$lock_file" "$status_file" "$temp_file" "/var/lock/subsys/nagios"; do
        test -f "$file" && rm -f "$file"
    done
    # set default access rights for files and directories
    for file in "$log_file" "$state_retention_file" "$status_file"; do
	  if [ ! -e "$file" ]; then
	        touch "$file"
	  fi
      chown --no-dereference $nagios_user:$nagios_cmdgrp "$file"
    done
	for dir in "$check_result_path" $(dirname $status_file); do
      if [ ! -d "$dir" ]; then
          mkdir -p "$dir"
      fi
      chown --no-dereference $nagios_user:$nagios_cmdgrp "$dir"
    done
    chmod 660 "$resource_file"
    chown --no-dereference $nagios_user:$nagios_cmdgrp "$resource_file"
}

check_lock_file() {
	PIDDIR=$(dirname $lock_file)
	case "$PIDDIR" in
		/var/run)
			if [ x"$nagios_user" != x"root" ]; then
				DATESTRING=`date +"%Y%m%d"`
				mv -f "$NAGIOS_CFG" "$NAGIOS_CFG-$DATESTRING"
				sed -e "s|^lock_file.*|pid_file=$NAGIOS_PIDFILE|g" "$NAGIOS_CFG-$DATESTRING" > "$NAGIOS_CFG"
				/bin/logger -t rcnagios "Configured $lock_file in $NAGIOS_CFG moved to $NAGIOS_PIDFILE. Backup is $NAGIOS_CFG-$DATESTRING"
				test -f "$lock_file" && rm -f "$lock_file"
				install -d -m755 -o$nagios_user -g$nagios_cmdgrp $(dirname "$NAGIOS_PIDFILE")
			else
				test -d "$PIDDIR" || mkdir -p "$PIDDIR"
			fi
		;;
		*)
			install -d -m755 -o$nagios_user -g$nagios_cmdgrp $(dirname "$NAGIOS_PIDFILE")
	esac
}

# Check for missing binaries (stale symlinks should not happen)
# Note: Special treatment of stop for LSB conformance
test -x "$NAGIOS_BIN" || { echo "$NAGIOS_BIN not installed or not executable.";
    if [ "$1" = "stop" ]; then exit 0;
    else exit 5; fi; }

# Check for existence of needed config file
test -r "$NAGIOS_CFG" || { echo "$NAGIOS_CFG not existing or readable.";
    if [ "$1" = "stop" ]; then exit 0;
    else exit 6; fi; }

# Check for existence of sysconfig file and read it
test -r "$NAGIOS_SYSCONFIG" || { echo "$NAGIOS_SYSCONFIG not existing or readable.";
	if [ "$1" = "stop" ]; then exit 0;
	else exit 6; fi; }

. "$NAGIOS_SYSCONFIG"

# set values for sysconfig vars
if [ -n "$NAGIOS_NICELEVEL" ]; then
	NICELEVEL="-n $NAGIOS_NICELEVEL"
else
	NICELEVEL="-n 0"
fi
if [ -z "$NAGIOS_TIMEOUT" ]; then
	NAGIOS_TIMEOUT=10
fi

#
# get variables from config file
#
nagios_user="$(get_var nagios_user)"
lock_file="$(get_var lock_file)"
status_file="$(get_var status_file)"
log_file="$(get_var log_file)"
temp_file="$(get_var temp_file)"
state_retention_file="$(get_var state_retention_file)"
command_file="$(get_var command_file)"
resource_file="$(get_var resource_file)"
object_cache_file="$(get_var object_cache_file)"
check_result_path="$(get_var check_result_path)"
check_external_commands="$(get_var check_external_commands)"

#
# use default values if above check doesn't work
#
: ${nagios_user:=nagios}
: ${nagios_cmdgrp:=nagcmd}
: ${resource_file:=/etc/nagios/resource.cfg}
# check ownership files
: ${check_result_path:=/var/spool/nagios}
: ${log_file:=/var/log/nagios/nagios.log}
: ${state_retention_file:=/var/log/nagios/retention.dat}
: ${status_file:=/var/log/nagios/status.dat}
: ${check_external_commands:=0}
# files to remove
: ${command_file:=/var/spool/nagios/nagios.cmd}
: ${lock_file:=/var/run/nagios/nagios.pid}
: ${object_cache_file:=/var/lib/nagios/objects.cache}
: ${temp_file:=/var/log/nagios/nagios.tmp}

# Reset status of this service
rc_reset

case "$1" in
    start)
        echo -n "Starting Nagios "
        config_check
        if [ $? -eq 0 ]; then
            # check if nagios is already running
            NAGPID=$(pidof "$NAGIOS_BIN")
            if [ -n "$NAGPID" ]; then
                echo "- Error: looks like Nagios is still running with PID $NAGPID"
                echo -n "- trying to kill previous Nagios process"
                kill -9 $NAGPID
                sleep 2
            fi	
            check_files
            check_lock_file
            startproc $NICELEVEL -p "$lock_file" "$NAGIOS_BIN" -d "$NAGIOS_CFG"
            if [ "$check_external_commands" != 0 ]; then
                while [ ! -e "$command_file" ] && [ $NAGIOS_TIMEOUT -gt 0 ]; do
			sleep 1
			NAGIOS_TIMEOUT=$(($NAGIOS_TIMEOUT-1))
		done
                chgrp --no-dereference $nagios_cmdgrp "$command_file"
                chown --no-dereference $nagios_user:$nagios_cmdgrp "$check_result_path"
            fi
        else
            echo "Error in configuration - please read $NAGIOS_CFG_ERR_LOG"
            rc_failed
        fi
        rc_status -v
    ;;
    stop)
        echo -n "Shutting down Nagios "
        # we have to wait for nagios to exit and remove its
        # own Lockfile, otherwise a following "start" could
        # happen, and then the exiting nagios will remove the
        # new Lockfile, allowing multiple nagios daemons
        # to (sooner or later) run - John Sellens

        if checkproc "$NAGIOS_BIN" ; then
            killproc -p "$lock_file" -TERM "$NAGIOS_BIN"
            sleep 1
            if [ -e "$lock_file" ]; then
                echo "Warning - Nagios did not exit in a timely manner. Waiting..."
                while [ -e "$lock_file" ] && [ $NAGIOS_TIMEOUT -gt 0 ] ; do
                    sleep 1
                    NAGIOS_TIMEOUT=$(($NAGIOS_TIMEOUT-1))
                    echo -n '.'
                    [ $NAGIOS_TIMEOUT -eq 41 ] && echo
                done
            fi
            if checkproc "$NAGIOS_BIN" ; then
                killproc -p "$lock_file" -SIGKILL "$NAGIOS_BIN"
                echo -n "Warning: Nagios killed"
            fi
        else
            echo -n "Nagios not running"
            rc_failed 7
        fi
        check_files
		rc_reset
        rc_status -v
    ;;
    try-restart)
        ## Do a restart only if the service was active before.
        $0 status
        if test $? = 0; then
            $0 restart
        else
            rc_reset        # Not running is not a failure.
        fi
        rc_status
    ;;
    restart)
        $0 check
        $0 stop
        $0 start
        rc_status
    ;;
    reload|force-reload)
        echo -n "Reload service Nagios "
        config_check
        if [ $? -eq 0 ]; then
          echo -n "Passed configuration check - reloading..."
          killproc -HUP -p "$lock_file" "$NAGIOS_BIN"
        else
          echo "- Error in configuration files"
          echo -n "- aborting reload - please read $NAGIOS_CFG_ERR_LOG"
          rc_failed
        fi
        rc_status -v
    ;;
    status)
        echo -n "Checking for Nagios: "
        if [ -x "$NAGIOS_DAEMONCHK" ]; then
            if "$NAGIOS_DAEMONCHK" -l "$lock_file"; then
                rc_failed 0
            else
                rc_failed 1
            fi
        else
            checkproc -p "$lock_file" "$NAGIOS_BIN"
        fi
        rc_status -v
    ;;
    check)
        echo -n "Starting configuration check "
        config_check
        if [ $? -eq 0 ]; then
            echo "- passed configuration check"
            test -f $NAGIOS_CFG_ERR_LOG && rm $NAGIOS_CFG_ERR_LOG
            rc_reset
        else
            echo "- detected Error in configuration files"
            echo "Please read $NAGIOS_CFG_ERR_LOG"
            rc_failed
        fi
        rc_status -v
    ;;
    check_verbose)
        echo "Running verbose configuration check..."
        config_check verbose
        exitcode=$?
        cat "$NAGIOS_CFG_ERR_LOG"
        rc_failed $exitcode
        rc_status -v
        rc_exit
    ;;
    *)
        echo "Usage: $0 {start|stop|status|try-restart|restart|reload|check|check_verbose}"
        exit 1
        ;;
esac
rc_exit