#!/bin/sh
#
# License:      GNU General Public License (GPL) 
# Support:      users@clusterlabs.org
#
#	This script manages IP alias IP addresses
#
#	It can add an IP alias, or remove one.
#
#	usage: $0 {start|stop|status|monitor|validate-all|meta-data}
#
#	The "start" arg adds an IP alias.
#
#	Surprisingly, the "stop" arg removes one.	:-)
#
#       OCF parameters are as below
#       OCF_RESKEY_ip
#       OCF_RESKEY_broadcast
#       OCF_RESKEY_nic
#       OCF_RESKEY_cidr_netmask
#       OCF_RESKEY_lvs_support  ( e.g. true, on, 1 )
#       OCF_RESKEY_ARP_INTERVAL_MS
#       OCF_RESKEY_ARP_REPEAT
#       OCF_RESKEY_ARP_BACKGROUND (e.g. yes )
#       OCF_RESKEY_ARP_NETMASK
#       OCF_RESKEY_local_start_script
#       OCF_RESKEY_local_stop_script
#
#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

# Parameter defaults

OCF_RESKEY_ip_default=""
OCF_RESKEY_nic_default="eth0"
OCF_RESKEY_cidr_netmask_default=""
OCF_RESKEY_broadcast_default=""
OCF_RESKEY_iflabel_default=""
OCF_RESKEY_lvs_support_default="false"
OCF_RESKEY_local_stop_script_default=""
OCF_RESKEY_local_start_script_default=""
OCF_RESKEY_ARP_INTERVAL_MS_default="500"
OCF_RESKEY_ARP_REPEAT_default="10"
OCF_RESKEY_ARP_BACKGROUND_default="yes"
OCF_RESKEY_ARP_NETMASK_default="ffffffffffff"

: ${OCF_RESKEY_ip=${OCF_RESKEY_ip_default}}
: ${OCF_RESKEY_nic=${OCF_RESKEY_nic_default}}
: ${OCF_RESKEY_cidr_netmask=${OCF_RESKEY_cidr_netmask_default}}
: ${OCF_RESKEY_broadcast=${OCF_RESKEY_broadcast_default}}
: ${OCF_RESKEY_iflabel=${OCF_RESKEY_iflabel_default}}
: ${OCF_RESKEY_lvs_support=${OCF_RESKEY_lvs_support_default}}
: ${OCF_RESKEY_local_stop_script=${OCF_RESKEY_local_stop_script_default}}
: ${OCF_RESKEY_local_start_script=${OCF_RESKEY_local_start_script_default}}
: ${OCF_RESKEY_ARP_INTERVAL_MS=${OCF_RESKEY_ARP_INTERVAL_MS_default}}
: ${OCF_RESKEY_ARP_REPEAT=${OCF_RESKEY_ARP_REPEAT_default}}
: ${OCF_RESKEY_ARP_BACKGROUND=${OCF_RESKEY_ARP_BACKGROUND_default}}
: ${OCF_RESKEY_ARP_NETMASK=${OCF_RESKEY_ARP_NETMASK_default}}

SENDARP=$HA_BIN/send_arp
FINDIF=$HA_BIN/findif
VLDIR=$HA_RSCTMP
SENDARPPIDDIR=$HA_RSCTMP
SENDARPPIDFILE="$SENDARPPIDDIR/send_arp-$OCF_RESKEY_ip"
USAGE="usage: $0 {start|stop|status|monitor|validate-all|meta-data}";

#######################################################################

SYSTYPE="`uname -s`"
case "$SYSTYPE" in
    SunOS)
        # `uname -r` = 5.9 -> SYSVERSION = 9
        SYSVERSION="`uname -r | cut -d. -f 2`"
	;;
    Darwin)
	# Treat Darwin the same as the other BSD variants (matched as *BSD)
	SYSTYPE="${SYSTYPE}BSD"
	;;
    *)
        ;;
esac



meta_data() {
        cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="IPaddr" version="1.0">
<version>1.0</version>
<longdesc lang="en">
This script manages IP alias IP addresses
It can add an IP alias, or remove one.
</longdesc>
<shortdesc lang="en">Manages virtual IPv4 addresses (portable version)</shortdesc>

<parameters>
<parameter name="ip" unique="1" required="1">
<longdesc lang="en">
The IPv4 address to be configured in dotted quad notation, for example
"192.168.1.1".
</longdesc>
<shortdesc lang="en">IPv4 address</shortdesc>
<content type="string" default="${OCF_RESKEY_ip_default}" />
</parameter>
<parameter name="nic" unique="0">
<longdesc lang="en">
The base network interface on which the IP address will be brought
online.

If left empty, the script will try and determine this from the
routing table.

Do NOT specify an alias interface in the form eth0:1 or anything here;
rather, specify the base interface only.

Prerequisite:

There must be at least one static IP address, which is not managed by
the cluster, assigned to the network interface.

If you can not assign any static IP address on the interface,
modify this kernel parameter:
sysctl -w net.ipv4.conf.all.promote_secondaries=1
(or per device)

</longdesc>
<shortdesc lang="en">Network interface</shortdesc>
<content type="string" default="${OCF_RESKEY_nic_default}"/>
</parameter>

<parameter name="cidr_netmask">
<longdesc lang="en">
The netmask for the interface in CIDR format. (ie, 24), or in
dotted quad notation  255.255.255.0).

If unspecified, the script will also try to determine this from the
routing table.
</longdesc>
<shortdesc lang="en">Netmask</shortdesc>
<content type="string" default="${OCF_RESKEY_cidr_netmask_default}"/>
</parameter>

<parameter name="broadcast">
<longdesc lang="en">
Broadcast address associated with the IP. If left empty, the script will
determine this from the netmask.
</longdesc>
<shortdesc lang="en">Broadcast address</shortdesc>
<content type="string" default="${OCF_RESKEY_broadcast_default}"/>
</parameter>

<parameter name="iflabel">
<longdesc lang="en">
You can specify an additional label for your IP address here.
</longdesc>
<shortdesc lang="en">Interface label</shortdesc>
<content type="string" default="${OCF_RESKEY_iflabel_default}"/>
</parameter>

<parameter name="lvs_support">
<longdesc lang="en">
Enable support for LVS Direct Routing configurations. In case a IP
address is stopped, only move it to the loopback device to allow the
local node to continue to service requests, but no longer advertise it
on the network.
</longdesc>
<shortdesc lang="en">Enable support for LVS DR</shortdesc>
<content type="boolean" default="${OCF_RESKEY_lvs_support_default}"/>
</parameter>

<parameter name="local_stop_script">
<longdesc lang="en">
Script called when the IP is released
</longdesc>
<shortdesc lang="en">Script called when the IP is released</shortdesc>
<content type="string" default="${OCF_RESKEY_local_stop_script_default}"/>
</parameter>

<parameter name="local_start_script">
<longdesc lang="en">
Script called when the IP is added
</longdesc>
<shortdesc lang="en">Script called when the IP is added</shortdesc>
<content type="string" default="${OCF_RESKEY_local_start_script_default}"/>
</parameter>

<parameter name="ARP_INTERVAL_MS">
<longdesc lang="en">
milliseconds between ARPs
</longdesc>
<shortdesc lang="en">milliseconds between gratuitous ARPs</shortdesc>
<content type="integer" default="${OCF_RESKEY_ARP_INTERVAL_MS_default}"/>
</parameter>

<parameter name="ARP_REPEAT">
<longdesc lang="en">
How many gratuitous ARPs to send out when bringing up a new address
</longdesc>
<shortdesc lang="en">repeat count</shortdesc>
<content type="integer" default="${OCF_RESKEY_ARP_REPEAT_default}"/>
</parameter>

<parameter name="ARP_BACKGROUND">
<longdesc lang="en">
run in background (no longer any reason to do this)
</longdesc>
<shortdesc lang="en">run in background</shortdesc>
<content type="boolean" default="${OCF_RESKEY_ARP_BACKGROUND_default}"/>
</parameter>

<parameter name="ARP_NETMASK">
<longdesc lang="en">
netmask for ARP - in nonstandard hexadecimal format.
</longdesc>
<shortdesc lang="en">netmask for ARP</shortdesc>
<content type="string" default="${OCF_RESKEY_ARP_NETMASK_default}"/>
</parameter>

</parameters>

<actions>
<action name="start"   timeout="20s" />
<action name="stop"    timeout="20s" />
<action name="monitor" depth="0"  timeout="20s" interval="5s" />
<action name="validate-all"  timeout="20s" />
<action name="meta-data"  timeout="5s" />
</actions>
</resource-agent>
END
        exit $OCF_SUCCESS
}

# The 'ping' command takes highly OS-dependent arguments, so this
# function creates a suitable argument list for the host OS's 'ping'.
# We use a subset of its functionality:
# 1. single packet
# 2. reasonable timeout (say 1 second)
#
# arguments:
#	$1: IP address to ping
# result string:
#	arguments for ping command
#
# If more flexibility is needed, they could be specified in the environment
# to this function, to adjust the resulting 'ping' arguments.
#	David Lee <t.d.lee@durham.ac.uk> May 2007
pingargs() {
	_baseip=$1
	_timeout=1	# seconds
	_pktcount=1
	_systype="`uname -s`"
	case $_systype in
		Linux)
			# Default is perpetual ping: need "-c $_pktcount".
			# -c count -t timetolive -q(uiet) -n(umeric) -W timeout
			_pingargs="-c $_pktcount -q -n $_baseip"
			;;
		SunOS)
			# Default is immediate (or timeout) return.
			_pingargs="$_baseip $_timeout"
			;;
		*)
			_pingargs="-c $_pktcount $_baseip"
			;;
	esac

	echo "$_pingargs"
}

#      On Linux systems the (hidden) loopback interface may
#      conflict with the requested IP address. If so, this
#      unoriginal code will remove the offending loopback address
#      and save it in VLDIR so it can be added back in later
#      when the IPaddr is released.
#
lvs_remove_conflicting_loopback() {
	ipaddr="$1"
	ifname="$2"

	ocf_log info "Removing conflicting loopback $ifname."
	if 
	  echo $ifname > "$VLDIR/$ipaddr"
	then
	  : Saved loopback information in $VLDIR/$ipaddr
	else
	  ocf_log err "Could not save conflicting loopback $ifname." \
	  "it will not be restored."
	fi

	if [ ! -z "${OCF_RESKEY_local_stop_script}" ]; then
		if [ -x "${OCF_RESKEY_local_stop_script}" ]; then
			${OCF_RESKEY_local_stop_script} $*
		fi
	fi

	delete_interface "$ifname" "$ipaddr"

	# Forcibly remove the route (if it exists) to the loopback.
	delete_route "$ipaddr"
}

#
#      On Linux systems the (hidden) loopback interface may
#      need to be restored if it has been taken down previously
#      by lvs_remove_conflicting_loopback()
#
lvs_restore_loopback() {
    ipaddr="$1"
    
    if [ ! -s "$VLDIR/$ipaddr" ]; then
	return
    fi

    ifname=`cat "$VLDIR/$ipaddr"`
    ocf_log info "Restoring loopback IP Address $ipaddr on $ifname."
    
    CMD="OCF_RESKEY_cidr_netmask=32 OCF_RESKEY_ip=$1 OCF_RESKEY_nic=$ifname $FINDIF"
    if
      NICINFO=`eval $CMD`
      NICINFO=`echo $NICINFO | tr "	" " " | tr -s " "`
    then
	netmask_text=`echo "$NICINFO" | cut -f3 -d " "`
	broadcast=`echo "$NICINFO" | cut -f5 -d " "`
    else
	echo "ERROR: $CMD failed (rc=$rc)"
	exit $OCF_ERR_GENERIC
    fi
    
    add_interface "$ipaddr" "$ifname" "$ifname" $netmask_text $broadcast
    rm -f "$VLDIR/$ipaddr"
}

#
#      Find out which alias serves the given IP address
#      The argument is an IP address, and its output
#      is an aliased interface name (e.g., "eth0:0").
#
find_interface_solaris() {
    ipaddr="$1"

    $IFCONFIG $IFCONFIG_A_OPT | $AWK '{if ($0 ~ /.*: / && NR > 1) {print "\n"$0} else {print}}' |
    while read ifname linkstuff
    do
	: ifname = $ifname
	read inet addr junk
	: inet = $inet addr = $addr
	while
	read line && [ "X$line" != "X" ]
	do
	    : Nothing
	done
	
	case $ifname in
	    *:*)	;;
	    *)	continue;;
	esac
	
    #  This doesn't look right for a box with multiple NICs.
    #  It looks like it always selects the first interface on
    #  a machine.  Yet, we appear to use the results for this case too...
	ifname=`echo "$ifname" | sed s'%:$%%'`
	
	case $addr in
	    addr:$ipaddr) echo $ifname; return $OCF_SUCCESS;;
            $ipaddr)	  echo $ifname; return $OCF_SUCCESS;;
	esac
     done
  return $OCF_ERR_GENERIC
}

find_interface_bsd() {
    $IFCONFIG $IFCONFIG_A_OPT | awk -v ip_addr="$ipaddr" '
					/UP,/ && $0 ~ /^[a-z]+[0-9]:/ { 
    						if_name=$1; sub(":$","",if_name); 
					}
					$1 == "inet" && $2 == ip_addr {
    						print if_name 
    						exit(0)
					}'

}

#
#	Find out which alias serves the given IP address
#	The argument is an IP address, and its output
#	is an aliased interface name (e.g., "eth0:0").
#
find_interface_generic() {
    ipaddr="$1"
    $IFCONFIG $IFCONFIG_A_OPT  |
    while read ifname linkstuff
    do
	: Read gave us ifname = $ifname
	
	read inet addr junk
	: Read gave us inet = $inet addr = $addr
	
	while
	read line && [ "X$line" != "X" ]
	do
	    : Nothing
	done
	
	case $ifname in
	    *:*)	ifname=`echo $ifname | sed 's/:$//'`;;
	    *)	continue;;
	esac
	
	: "comparing $ipaddr to $addr (from ifconfig)"
	case $addr in
	    addr:$ipaddr)   echo $ifname; return $OCF_SUCCESS;;
	    $ipaddr)	    echo $ifname; return $OCF_SUCCESS;;
	esac
     done
     return $OCF_ERR_GENERIC 
}

#
#       Find out which alias serves the given IP address
#       The argument is an IP address, and its output
#       is an aliased interface name (e.g., "eth0:0").
#
find_interface() {
    ipaddr="$1"
    case "$SYSTYPE" in
	SunOS)
	    NIC=`find_interface_solaris $ipaddr`;;
	*BSD)
	    NIC=`find_interface_bsd $ipaddr`;;
	*)
	    NIC=`find_interface_generic $ipaddr`;;
       esac

  echo $NIC
  return $OCF_SUCCESS;
}

#
#	Find an unused interface/alias name for us to use for new IP alias
#	The argument is an IP address, and the output
#	is an aliased interface name (e.g., "eth0:0", "dc0", "le0:0").
#
find_free_interface() {
    NIC="$1"

    if [ "X$NIC" = "X" ]; then
	ocf_log err "No free interface found for $OCF_RESKEY_ip"
	return $OCF_ERR_GENERIC;
    fi

  NICBASE="$VLDIR/IPaddr-$NIC"
  touch "$NICBASE"

  case "$SYSTYPE" in
	*BSD)
		echo $NIC;
		return $OCF_SUCCESS;;
	SunOS)
		j=1
		IFLIST=`$IFCONFIG $IFCONFIG_A_OPT | \
			grep "^$NIC:[0-9]" | sed 's%: .*%%'`;;
	*)
		j=0
		IFLIST=`$IFCONFIG $IFCONFIG_A_OPT | \
			grep "^$NIC:[0-9]" | sed 's% .*%%'`
                TRYADRCNT=`ls "${NICBASE}:"* 2>/dev/null | wc -w | tr -d ' '`
		if [ -f "${NICBASE}:${TRYADRCNT}" ]; then
		  : OK
		else
		  j="${TRYADRCNT}"
		fi
		;;
  esac

  IFLIST=" `echo $IFLIST` "
  while
     [ $j -lt 512 ]
  do
      case $IFLIST in
	  *" "$NIC:$j" "*)	
		;;
	  *)
		NICLINK="$NICBASE:$j"
		if
		    ln "$NICBASE" "$NICLINK" 2>/dev/null
		then
		    echo "$NIC:$j"
		    return $OCF_SUCCESS
		fi
		;;
       esac
       j=`expr $j + 1`
  done
  return $OCF_ERR_GENERIC
}

delete_route () {
  ipaddr="$1"

  case "$SYSTYPE" in
	SunOS)	return 0;;
	*BSD)	CMD="$ROUTE -n delete -host $ipaddr";;
	*)	CMD="$ROUTE -n del -host $ipaddr";;
  esac

  $CMD

  return $?
}

delete_interface () {
  ifname="$1"
  ipaddr="$2"

  case "$SYSTYPE" in
      SunOS)
		if [ "$SYSVERSION" -ge 8 ] ; then
		    CMD="$IFCONFIG $ifname unplumb"
		else
		    CMD="$IFCONFIG $ifname 0 down"
		fi;;
      Darwin*)
		CMD="$IFCONFIG $ifname $ipaddr delete";;
      *BSD)
		CMD="$IFCONFIG $ifname inet $ipaddr delete";;
      *)
		CMD="$IFCONFIG $ifname down";;
  esac

  ocf_log info "$CMD"
  $CMD

  return $?
}


add_interface () {
  ipaddr="$1"
  iface_base="$2"
  iface="$3"
  netmask="$4"
  broadcast="$5"

  if [ $# != 5 ]; then
      ocf_log err "Insufficient arguments to add_interface: $*"
      exit $OCF_ERR_ARGS
  fi

  case "$SYSTYPE" in
    SunOS)
	  if [ "$SYSVERSION" -ge 8 ] ; then
	      $IFCONFIG $iface plumb
	      rc=$?
	      if [ $rc -ne 0 ] ; then
		  echo "ERROR: '$IFCONFIG $iface plumb' failed."
		  return $rc
	      fi
	  fi
	  # At Solaris 10, this single-command version sometimes broke.
	  # Almost certainly an S10 bug.
	  #	CMD="$IFCONFIG $iface inet $ipaddr $text up"
	  # So hack the following workaround:
	  CMD="$IFCONFIG $iface inet $ipaddr"
	  CMD="$CMD && $IFCONFIG $iface netmask $netmask"
	  CMD="$CMD && $IFCONFIG $iface up"
	  ;;
      
    *BSD)
	  # netmask is always set to 255.255.255.255 for an alias 
	  CMD="$IFCONFIG $iface inet $ipaddr netmask 255.255.255.255 alias";;
    *)		
	  CMD="$IFCONFIG $iface $ipaddr netmask $netmask broadcast $broadcast";;
  esac

  # Use "eval $CMD" (not "$CMD"): it might be a chain of two or more commands.
  ocf_log info "eval $CMD"
  eval $CMD
  rc=$?
  if [ $rc != 0 ]; then
      echo "ERROR: eval $CMD failed (rc=$rc)"
  fi

  return $rc
}

#
#	Remove the IP alias for the requested IP address...
#
ip_stop() {
  SENDARPPIDFILE="$SENDARPPIDDIR/send_arp-$OCF_RESKEY_ip"
  NIC=`find_interface $OCF_RESKEY_ip`

  if [ -f "$SENDARPPIDFILE" ]; then
	cat "$SENDARPPIDFILE" | xargs kill
	rm -f "$SENDARPPIDFILE"
  fi

  if [ -z "$NIC" ]; then
      : Requested interface not in use
      return $OCF_SUCCESS
  fi

  if [ ${OCF_RESKEY_lvs_support} = 1 ]; then 
      case $NIC in
	  lo*)
	      : Requested interface is on loopback
	      return $OCF_SUCCESS;;
      esac
  fi

  delete_route "$OCF_RESKEY_ip"
  delete_interface "$NIC" "$OCF_RESKEY_ip"
  rc=$?

  if [ ${OCF_RESKEY_lvs_support} = 1 ]; then
      lvs_restore_loopback "$OCF_RESKEY_ip"
  fi

  # remove lock file...
  rm -f "$VLDIR/IPaddr-$NIC"

  if [ $rc != 0 ]; then
      ocf_log warn "IP Address $OCF_RESKEY_ip NOT released: rc=$rc"
      return $OCF_ERR_GENERIC
  fi
  return $OCF_SUCCESS
}


#
#	Add an IP alias for the requested IP address...
#
#	It could be that we already have taken it, in which case it should
#	do nothing.
#

ip_start() {
  #
  #	Do we already service this IP address?
  #
    ip_status_internal
    if [ $? = $OCF_SUCCESS ]; then
	# Nothing to do, the IP is already active
	return $OCF_SUCCESS;
    fi

    NIC_unique=`find_free_interface $OCF_RESKEY_nic`
    if [ -n "$NIC_unique" ]; then
	: OK got interface [$NIC_unique] for $OCF_RESKEY_ip 
    else
	return $OCF_ERR_GENERIC
    fi
    
    # This logic is mostly to support LVS (If I understand it correctly)
    if [ ${OCF_RESKEY_lvs_support} = 1 ]; then
	NIC_current=`find_interface $OCF_RESKEY_ip`
	case $NIC_unique in
	    lo*) 
		if [ x"$NIC_unique" = x"$NIC_current" ]; then
		    # Its already "running" and not moving, nothing to do.
		    ocf_log err "Could not find a non-loopback device to move $OCF_RESKEY_ip to"
		    return $OCF_ERR_GENERIC
		fi;;
	    *)   lvs_remove_conflicting_loopback "$OCF_RESKEY_ip" "$NIC_current";;
	esac
    fi

	if [ ! -z "${OCF_RESKEY_local_start_script}" ]; then
		if [ -x "${OCF_RESKEY_local_start_script}" ]; then
			${OCF_RESKEY_local_start_script} $*
		fi
	fi

    add_interface "$OCF_RESKEY_ip" "$OCF_RESKEY_nic" "$NIC_unique" \
		 "$OCF_RESKEY_cidr_netmask" "$OCF_RESKEY_broadcast"
    rc=$?
    if [ $rc != 0 ]; then
	ocf_log err "Could not add $OCF_RESKEY_ip to $OCF_RESKEY_nic: rc=$rc"
	return $rc
    fi

    # The address is active, now notify others about it using sendarp

    if [ "$SYSTYPE" = "DarwinBSD" -a "$NIC_unique" = "lo0" ]; then
	# Darwin can't send ARPs on loopback devices
	SENDARP="x$SENDARP" # Prevent the binary from being found
    fi

    if [ -x $SENDARP ]; then
	TARGET_INTERFACE=`echo $NIC_unique | sed 's%:.*%%'`
	SENDARPPIDFILE="$SENDARPPIDDIR/send_arp-$OCF_RESKEY_ip"    
       
	ARGS="-i $OCF_RESKEY_ARP_INTERVAL_MS -r $OCF_RESKEY_ARP_REPEAT"
	ARGS="$ARGS -p $SENDARPPIDFILE $TARGET_INTERFACE $OCF_RESKEY_ip"
	ARGS="$ARGS auto $OCF_RESKEY_ip $OCF_RESKEY_ARP_NETMASK"

	ocf_log debug "Sending Gratuitous Arp for $OCF_RESKEY_ip on $NIC_unique [$TARGET_INTERFACE]"
	case $OCF_RESKEY_ARP_BACKGROUND in
	    yes) ($SENDARP $ARGS || ocf_log err "Could not send gratuitous arps. rc=$?" & ) >&2 ;;
	    *)   $SENDARP $ARGS || ocf_log err "Could not send gratuitous arps. rc=$?";;
	esac
    fi

    ip_status_internal
    return $?
}

ip_status_internal() {
    NIC=`find_interface "$OCF_RESKEY_ip"`

    if [ "x$NIC" = x ]; then
	return $OCF_NOT_RUNNING

    elif [ "${OCF_RESKEY_lvs_support}" = "1" ]; then 
	case $NIC in
	    lo*) return $OCF_NOT_RUNNING;;
	    *)	 return $OCF_SUCCESS;;
	esac
    else
	if [ x$OCF_RESKEY_nic != x ]; then
	    simple_OCF_NIC=`echo $OCF_RESKEY_nic | awk -F: '{print $1}'`
	    simple_NIC=`echo $NIC | awk -F: '{print $1}'`
	    if [ $simple_OCF_NIC != $simple_NIC ]; then
		ocf_log err "$OCF_RESKEY_ip is running an interface ($simple_NIC) instead of the configured one ($simple_OCF_NIC)"
		return $OCF_ERR_GENERIC
	    fi
	fi
	return $OCF_SUCCESS
    fi
}

ip_status() {
    ip_status_internal
    rc=$?
    if [ $rc = $OCF_SUCCESS ]; then
	echo "running"
    elif [ $rc = $OCF_NOT_RUNNING ]; then
	echo "stopped"
    else
	echo "unknown"
    fi
    return $rc;
}

#
#	Determine if this IP address is really being served, or not.
#	Note that we must distinguish if *we're* serving it locally...
#
ip_monitor() {
    ip_status_internal
    rc=$?

    if [ $OCF_CHECK_LEVEL = 0 -o $rc != 0 ]; then
	return $rc
    fi
    
    ocf_log info "Checking IP stack"

    PINGARGS="`pingargs $OCF_RESKEY_ip`"
    for j in 1 2 3 4 5 6 7 8 9 10; do
        MSG=`$PING $PINGARGS 2>&1`
        if [ $? = 0 ]; then
            return $OCF_SUCCESS
        fi
    done

    ocf_log err "$MSG"
    return $OCF_ERR_GENERIC
}

is_positive_integer() {
    ocf_is_decimal $1 && [ $1 -ge 1 ]
    if [ $? = 0 ]; then
	return 1
    fi
    return 0
}

ip_validate_all() {
    check_binary $AWK
    check_binary $IFCONFIG
    check_binary $ROUTE
    check_binary $PING

    if is_positive_integer $OCF_RESKEY_ARP_INTERVAL_MS
    then
	ocf_log err "Invalid parameter value: ARP_INTERVAL_MS [$OCF_RESKEY_ARP_INTERVAL_MS]"
	return $OCF_ERR_ARGS
    fi

    if is_positive_integer $OCF_RESKEY_ARP_REPEAT
    then
	ocf_log err "Invalid parameter value: ARP_REPEAT [$OCF_RESKEY_ARP_REPEAT]"
	return $OCF_ERR_ARGS
    fi

    if [ "$SYSTYPE" = "Linux" -o "$SYSTYPE" = "SunOS" ]; then
	:
    else 
	if [ "${OCF_RESKEY_lvs_support}" = "1" ]; then
	    ocf_log err "$SYSTYPE does not support LVS"
	    return $OCF_ERR_GENERIC
	fi
    fi

    case $OCF_RESKEY_ip in
	"")	ocf_log err "Required parameter OCF_RESKEY_ip is missing"
	    return $OCF_ERR_CONFIGURED;;
        [0-9]*.[0-9]*.[0-9]*.*[0-9])	: OK;;
	*)	ocf_log err "Parameter OCF_RESKEY_ip [$OCF_RESKEY_ip] not an IP address"
	    return $OCF_ERR_CONFIGURED;;
    esac

    # Unconditionally do this?
    case $OCF_RESKEY_nic in
        *:*)
            OCF_RESKEY_nic=`echo $OCF_RESKEY_nic | sed 's/:.*//'`
            ;;
    esac

    NICINFO=`$FINDIF`
    rc=$?

    if [ $rc != 0 ]; then
	ocf_log err "$FINDIF failed [rc=$rc]."
	return $OCF_ERR_GENERIC
    fi
    
    tmp=`echo "$NICINFO" | cut -f1`
    if
      [ "x$OCF_RESKEY_nic" = "x" ]
    then
      ocf_log info "Using calculated nic for ${OCF_RESKEY_ip}: $tmp"
      OCF_RESKEY_nic=$tmp
    elif
      [ x$tmp != x${OCF_RESKEY_nic} ]
    then
      ocf_log err "Invalid parameter value: nic [$OCF_RESKEY_nic] Calculated nic: [$tmp]"
      return $OCF_ERR_ARGS
    fi

    tmp=`echo "$NICINFO" | cut -f2 | cut -d ' ' -f2`
    if
      [ "x$OCF_RESKEY_cidr_netmask" != "x$tmp" ]
    then
      ocf_log info "Using calculated netmask for ${OCF_RESKEY_ip}: $tmp"
    fi

    # Always use the calculated version becuase it might have been specified 
    #  using CIDR notation which not every system accepts
    OCF_RESKEY_netmask=$tmp
    OCF_RESKEY_cidr_netmask=$tmp; export OCF_RESKEY_cidr_netmask
    
    tmp=`echo "$NICINFO" | cut -f3 | cut -d ' ' -f2`
    if
      [ "x$OCF_RESKEY_broadcast" = "x" ]
    then
      ocf_log debug "Using calculated broadcast for ${OCF_RESKEY_ip}: $tmp"
      OCF_RESKEY_broadcast=$tmp

    elif [ x$tmp != x${OCF_RESKEY_broadcast} ]; then
      ocf_log err "Invalid parameter value: broadcast [$OCF_RESKEY_broadcast] Calculated broadcast: [$tmp]"
      return $OCF_ERR_ARGS
    fi
    
    return $OCF_SUCCESS
}
  
usage() {
    echo $USAGE >&2
    return $1
}

if [ $# -ne 1 ]; then
    usage $OCF_ERR_ARGS
fi

# Normalize the value of lvs_support
if [ "${OCF_RESKEY_lvs_support}" = "true" \
    -o "${OCF_RESKEY_lvs_support}" = "on" \
    -o "${OCF_RESKEY_lvs_support}" = "yes" \
    -o "${OCF_RESKEY_lvs_support}" = "1" ]; then
    OCF_RESKEY_lvs_support=1
else
    OCF_RESKEY_lvs_support=0
fi

# Note: We had a version out there for a while which used
# netmask instead of cidr_netmask. So, don't remove this aliasing code!
if
  [ ! -z "$OCF_RESKEY_netmask" -a -z "$OCF_RESKEY_cidr_netmask" ]
then
  OCF_RESKEY_cidr_netmask=$OCF_RESKEY_netmask
  export OCF_RESKEY_cidr_netmask
fi

case $1 in
    meta-data)		meta_data;;
    start)		ip_validate_all	&& ip_start;;
    stop)		ip_stop;;
    status)		ip_status;;
    monitor)		ip_monitor;;
    validate-all)	ip_validate_all;;
    usage)		usage $OCF_SUCCESS;;
    *)			usage $OCF_ERR_UNIMPLEMENTED;;
esac

exit $?