# utility functions for ctdb event scripts

#######################################
# pull in a system config file, if any
loadconfig() {
    name="$1"
    if [ -f /etc/sysconfig/$name ]; then
	. /etc/sysconfig/$name
    elif [ -f /etc/default/$name ]; then
	. /etc/default/$name
    elif [ -f $CTDB_BASE/sysconfig/$name ]; then
	. $CTDB_BASE/sysconfig/$name
    fi
}

##############################################################
# determine on what type of system (init style) we are running
detect_init_style() {
    # only do detection if not already set:
    test "x$CTDB_INIT_STYLE" != "x" && return

    if [ -x /sbin/startproc ]; then
        CTDB_INIT_STYLE="suse"
    elif [ -x /sbin/start-stop-daemon ]; then
        CTDB_INIT_STYLE="ubuntu"
    else
        CTDB_INIT_STYLE="redhat"
    fi
}

######################################################
# simulate /sbin/service on platforms that don't have it
service() { 
  service_name="$1"
  op="$2"

  # do nothing, when no service was specified
  test "x$service_name" = "x" && return

  if [ -x /sbin/service ]; then
      /sbin/service "$service_name" "$op"
  elif [ -x /etc/init.d/$service_name ]; then
      /etc/init.d/$service_name "$op"
  elif [ -x /etc/rc.d/init.d/$service_name ]; then
      /etc/rc.d/init.d/$service_name "$op"
  fi
}

######################################################
# simulate /sbin/service (niced) on platforms that don't have it
nice_service() { 
  service_name="$1"
  op="$2"

  # do nothing, when no service was specified
  test "x$service_name" = "x" && return

  if [ -x /sbin/service ]; then
      nice /sbin/service "$service_name" "$op"
  elif [ -x /etc/init.d/$service_name ]; then
      nice /etc/init.d/$service_name "$op"
  elif [ -x /etc/rc.d/init.d/$service_name ]; then
      nice /etc/rc.d/init.d/$service_name "$op"
  fi
}

######################################################
# wait for a command to return a zero exit status
# usage: ctdb_wait_command SERVICE_NAME <command>
######################################################
ctdb_wait_command() {
  service_name="$1"
  wait_cmd="$2"
  [ -z "$wait_cmd" ] && return;
  all_ok=0
  echo "Waiting for service $service_name to start"
  while [ $all_ok -eq 0 ]; do
	  $wait_cmd > /dev/null 2>&1 && all_ok=1
	  ctdb status > /dev/null 2>&1 || {
  		echo "ctdb daemon has died. Exiting wait for $service_name"
		exit 1
	  }
	  [ $all_ok -eq 1 ] || sleep 1
  done
  echo "Local service $service_name is up"
}


######################################################
# wait for a set of tcp ports
# usage: ctdb_wait_tcp_ports SERVICE_NAME <ports...>
######################################################
ctdb_wait_tcp_ports() {
  service_name="$1"
  shift
  wait_ports="$*"
  [ -z "$wait_ports" ] && return;
  all_ok=0
  echo "Waiting for tcp service $service_name to start"
  while [ $all_ok -eq 0 ]; do
  	  all_ok=1
  	  for p in $wait_ports; do
	      if [ -x /usr/bin/netcat ]; then
	          /usr/bin/netcat -z 127.0.0.1 $p > /dev/null || all_ok=0
	      elif [ -x /usr/bin/nc ]; then
	          /usr/bin/nc -z 127.0.0.1 $p > /dev/null || all_ok=0
	      elif [ -x /usr/bin/netstat ]; then
	          (netstat -a -n | egrep "0.0.0.0:$p[[:space:]]*LISTEN" > /dev/null) || all_ok=0
	      elif [ -x /bin/netstat ]; then
	          (netstat -a -n | egrep "0.0.0.0:$p[[:space:]]*LISTEN" > /dev/null) || all_ok=0
	      else 
		  echo "No tool to check tcp ports availabe. can not check in ctdb_wait_tcp_ports"
		  return
	      fi
	  done
	  [ $all_ok -eq 1 ] || sleep 1
	  ctdb status > /dev/null 2>&1 || {
  		echo "ctdb daemon has died. Exiting tcp wait $service_name"
		exit 1
	  }
  done
  echo "Local tcp services for $service_name are up"
}



######################################################
# wait for a set of directories
# usage: ctdb_wait_directories SERVICE_NAME <directories...>
######################################################
ctdb_wait_directories() {
  service_name="$1"
  shift
  wait_dirs="$*"
  [ -z "$wait_dirs" ] && return;
  all_ok=0
  echo "Waiting for local directories for $service_name"
  while [ $all_ok -eq 0 ]; do
  	  all_ok=1
  	  for d in $wait_dirs; do
  	      [ -d $d ] || all_ok=0
	  done
	  [ $all_ok -eq 1 ] || sleep 1
	  ctdb status > /dev/null 2>&1 || {
  		echo "ctdb daemon has died. Exiting directory wait for $service_name"
		exit 1
	  }
  done
  echo "Local directories for $service_name are available"
}


######################################################
# check that a rpc server is registered with portmap
# and responding to requests
# usage: ctdb_check_rpc SERVICE_NAME PROGNUM VERSION
######################################################
ctdb_check_rpc() {
    service_name="$1"
    prognum="$2"
    version="$3"
    rpcinfo -u localhost $prognum $version > /dev/null || {
	    echo "ERROR: $service_name not responding to rpc requests"
	    exit 1
    }
}

######################################################
# check a set of directories is available
# return 0 on a missing directory
# usage: ctdb_check_directories_probe SERVICE_NAME <directories...>
######################################################
ctdb_check_directories_probe() {
  service_name="$1"
  shift
  wait_dirs="$*"
  [ -z "$wait_dirs" ] && return;
  for d in $wait_dirs; do
      ( echo $d | grep -q '%' ) && continue
      [ -d $d ] || return 1
  done
  return 0
}

######################################################
# check a set of directories is available
# usage: ctdb_check_directories SERVICE_NAME <directories...>
######################################################
ctdb_check_directories() {
  service_name="$1"
  shift
  wait_dirs="$*"
  ctdb_check_directories_probe "$service_name" $wait_dirs || {
      echo "ERROR: $service_name directory $d not available"
      exit 1
  }
}

######################################################
# check a set of tcp ports
# usage: ctdb_check_tcp_ports SERVICE_NAME <ports...>
######################################################
ctdb_check_tcp_ports() {
  service_name="$1"
  shift
  wait_ports="$*"
  [ -z "$wait_ports" ] && return;

  # check availability of netcat or netstat first
  NETCAT=""
  NETSTAT=""
  if [ -x /usr/bin/netstat ]; then
      NETSTAT=/usr/bin/netstat
  elif [ -x /bin/netstat ]; then
      NETSTAT=/bin/netstat
  elif [ -x /usr/bin/netcat ]; then
      NETCAT=/usr/bin/netcat
  elif [ -x /bin/netcat ]; then
      NETCAT=/bin/netcat
  elif [ -x /usr/bin/nc ]; then
      NETCAT=/usr/bin/nc
  elif [ -x /bin/nc ]; then
      NETCAT=/bin/nc
  fi

  for p in $wait_ports; do
      all_ok=1

      if [ "x${NETCAT}" != "x" ]; then
          ${NETCAT} -z 127.0.0.1 $p > /dev/null || all_ok=0
      elif [ "x${NETSTAT}" != "x" ]; then
          if ! ${NETSTAT} -a -n | egrep "0.0.0.0:$p .*LISTEN" > /dev/null ; then
              if ! ${NETSTAT} -a -n | egrep ":::$p .*LISTEN" > /dev/null ; then
                  all_ok=0
              fi
          fi
      else
          echo "ERROR: neither netcat (or nc) nor netstat found!"
          echo "ERROR: can't monitor ${service_name} tcp port ${p}"
          all_ok=0
      fi

      [ $all_ok -eq 1 ] || {
	  echo "ERROR: $service_name tcp port $p is not responding"
	  exit 1
      }
  done
}

######################################################
# check a command returns zero status
# usage: ctdb_check_command SERVICE_NAME <command>
######################################################
ctdb_check_command() {
  service_name="$1"
  wait_cmd="$2"
  [ -z "$wait_cmd" ] && return;
  $wait_cmd > /dev/null 2>&1 || {
      echo "ERROR: $service_name - $wait_cmd returned error"
      exit 1
  }
}

################################################
# kill off any TCP connections with the given IP
################################################
kill_tcp_connections() {
    _IP="$1"    
    _failed=0

    _killcount=0
    connfile="$CTDB_BASE/state/connections.$_IP"
    netstat -tn |egrep "^tcp.*[[:space:]]+$_IP:.*ESTABLISHED" | awk '{print $4" "$5}' > $connfile
    netstat -tn |egrep "^tcp.*[[:space:]]+::ffff:$_IP:.*ESTABLISHED" | awk '{print $4" "$5}' >> $connfile

    while read dest src; do
	srcip=`echo $src | sed -e "s/:[^:]*$//"`
	srcport=`echo $src | sed -e "s/^.*://"`
	destip=`echo $dest | sed -e "s/:[^:]*$//"`
	destport=`echo $dest | sed -e "s/^.*://"`
	echo "Killing TCP connection $srcip:$srcport $destip:$destport"
	ctdb killtcp $srcip:$srcport $destip:$destport >/dev/null 2>&1 || _failed=1
	case $destport in
	  # we only do one-way killtcp for NFS and CIFS
	  139|445|2049) : ;;
	  # for all others we do 2-way
	  *) 
	  	ctdb killtcp $destip:$destport $srcip:$srcport >/dev/null 2>&1 || _failed=1
		;;
	esac
	_killcount=`expr $_killcount + 1`
     done < $connfile
    /bin/rm -f $connfile

    [ $_failed = 0 ] || {
	echo "Failed to send killtcp control"
	return;
    }
    [ $_killcount -gt 0 ] || {
	return;
    }
    _count=0
    while netstat -tn |egrep "^tcp.*[[:space:]]+$_IP:.*ESTABLISHED" > /dev/null; do
	sleep 1
	_count=`expr $_count + 1`
	[ $_count -gt 3 ] && {
	    echo "Timed out killing tcp connections for IP $_IP"
	    return;
	}
    done
    echo "killed $_killcount TCP connections to released IP $_IP"
}

##################################################################
# kill off the local end for any TCP connections with the given IP
##################################################################
kill_tcp_connections_local_only() {
    _IP="$1"    
    _failed=0

    _killcount=0
    connfile="$CTDB_BASE/state/connections.$_IP"
    netstat -tn |egrep "^tcp.*[[:space:]]+$_IP:.*ESTABLISHED" | awk '{print $4" "$5}' > $connfile
    netstat -tn |egrep "^tcp.*[[:space:]]+::ffff:$_IP:.*ESTABLISHED" | awk '{print $4" "$5}' >> $connfile

    while read dest src; do
	srcip=`echo $src | sed -e "s/:[^:]*$//"`
	srcport=`echo $src | sed -e "s/^.*://"`
	destip=`echo $dest | sed -e "s/:[^:]*$//"`
	destport=`echo $dest | sed -e "s/^.*://"`
	echo "Killing TCP connection $srcip:$srcport $destip:$destport"
	ctdb killtcp $srcip:$srcport $destip:$destport >/dev/null 2>&1 || _failed=1
	_killcount=`expr $_killcount + 1`
     done < $connfile
    /bin/rm -f $connfile

    [ $_failed = 0 ] || {
	echo "Failed to send killtcp control"
	return;
    }
    [ $_killcount -gt 0 ] || {
	return;
    }
    _count=0
    while netstat -tn |egrep "^tcp.*[[:space:]]+$_IP:.*ESTABLISHED" > /dev/null; do
	sleep 1
	_count=`expr $_count + 1`
	[ $_count -gt 3 ] && {
	    echo "Timed out killing tcp connections for IP $_IP"
	    return;
	}
    done
    echo "killed $_killcount TCP connections to released IP $_IP"
}

########################################################
# start/stop the nfs service on different platforms
########################################################
startstop_nfs() {
	PLATFORM="unknown"
	[ -x /etc/init.d/nfsserver ] && {
		PLATFORM="sles"
	}
	[ -x /etc/init.d/nfslock ] && {
		PLATFORM="rhel"
	}

	case $PLATFORM in
	sles)
		case $1 in
		start)
			service nfsserver start
			;;
		stop)
			service nfsserver stop > /dev/null 2>&1
			;;
		esac
		;;
	rhel)
		case $1 in
		start)
			service nfslock start
			service nfs start
			;;
		stop)
			service nfs stop > /dev/null 2>&1
			service nfslock stop > /dev/null 2>&1
			;;
		esac
		;;
	*)
		echo "Unknown platform. NFS is not supported with ctdb"
		exit 1
		;;
	esac
}

########################################################
# start/stop the nfs lockmanager service on different platforms
########################################################
startstop_nfslock() {
	PLATFORM="unknown"
	[ -x /etc/init.d/nfsserver ] && {
		PLATFORM="sles"
	}
	[ -x /etc/init.d/nfslock ] && {
		PLATFORM="rhel"
	}

	case $PLATFORM in
	sles)
		# for sles there is no service for lockmanager
		# so we instead just shutdown/restart nfs
		case $1 in
		start)
			service nfsserver start
			;;
		stop)
			service nfsserver stop > /dev/null 2>&1
			;;
		esac
		;;
	rhel)
		case $1 in
		start)
			service nfslock start
			;;
		stop)
			service nfslock stop > /dev/null 2>&1
			;;
		esac
		;;
	*)
		echo "Unknown platform. NFS locking is not supported with ctdb"
		exit 1
		;;
	esac
}

########################################################
# remove an ip address from an interface
########################################################
remove_ip() {
	# the ip tool will delete all secondary IPs if this is the primary.
	# To work around this _very_ annoying behaviour we have to keep a
	# record of the secondaries and re-add them afterwards. yuck
	secondaries=""
	if ip addr list dev $2 primary | grep -q "inet $1 " ; then
	    secondaries=`ip addr list dev $2 secondary | grep " inet " | awk '{print $2}'`
	fi
	ip addr del $1 dev $2 >/dev/null 2>/dev/null || failed=1
	[ -z "$secondaries" ] || {
	    for i in $secondaries; do
		if ip addr list dev $2 | grep -q "inet $i" ; then
		    echo "kept secondary $i on dev $2"
		else 
		    echo "re-adding secondary address $i to dev $2"
		    ip addr add $i dev $2 || failed=1		
		fi
	    done
	}
}

########################################################
# load a site local config file
########################################################

[ -x $CTDB_BASE/rc.local ] && {
	. $CTDB_BASE/rc.local
}