#!/bin/sh
#
#	Route OCF RA. Enables and disables network routes.
#
#   (c) 2008-2010 Florian Haas, Dejan Muhamedagic,
#                 and Linux-HA contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#

#######################################################################
# Initialization:

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

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

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="Route" version="0.1">
<version>1.0</version>

<longdesc lang="en">
Enables and disables network routes.

Supports host and net routes, routes via a gateway address,
and routes using specific source addresses.

This resource agent is useful if a node's routing table
needs to be manipulated based on node role assignment.

Consider the following example use case:

  -  One cluster node serves as an IPsec tunnel endpoint.

  -  All other nodes use the IPsec tunnel to reach hosts
     in a specific remote network.

Then, here is how you would implement this scheme making use
of the Route resource agent:

  -  Configure an ipsec LSB resource.

  -  Configure a cloned Route OCF resource.

  -  Create an order constraint to ensure 
     that ipsec is started before Route.

  -  Create a colocation constraint between the
     ipsec and Route resources, to make sure no instance
     of your cloned Route resource is started on the
     tunnel endpoint itself.
</longdesc>
<shortdesc lang="en">Manages network routes</shortdesc>

<parameters>

<parameter name="destination" unique="1" required="1">
<longdesc lang="en">
The destination network (or host) to be configured for the route. 
Specify the netmask suffix in CIDR notation (e.g. "/24").
If no suffix is given, a host route will be created.
Specify "0.0.0.0/0" or "default" if you want this resource to set 
the system default route.
</longdesc>
<shortdesc lang="en">Destination network</shortdesc>
<content type="string" />
</parameter>

<parameter name="device" unique="0">
<longdesc lang="en">
The outgoing network device to use for this route.
</longdesc>
<shortdesc lang="en">Outgoing network device</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="gateway" unique="0">
<longdesc lang="en">
The gateway IP address to use for this route.
</longdesc>
<shortdesc lang="en">Gateway IP address</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="source" unique="0">
<longdesc lang="en">
The source IP address to be configured for the route.
</longdesc>
<shortdesc lang="en">Source IP address</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="table" unique="0">
<longdesc lang="en">
The routing table to be configured for the route.
</longdesc>
<shortdesc lang="en">Routing table</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start"        timeout="20" />
<action name="stop"         timeout="20" />
<action name="monitor"      timeout="20" interval="10" 
                            depth="0"/>
<action name="reload"       timeout="20" />
<action name="meta-data"    timeout="5" />
<action name="validate-all" timeout="20" />
</actions>
</resource-agent>
END
}

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

create_route_spec() {
    # Creates a route specification for use by "ip route (add|del|show)"
    route_spec="to ${OCF_RESKEY_destination}"
    if [ -n "${OCF_RESKEY_device}" ]; then
	route_spec="${route_spec} dev ${OCF_RESKEY_device}"
    fi
    if [ -n "${OCF_RESKEY_gateway}" ]; then
	route_spec="${route_spec} via ${OCF_RESKEY_gateway}"
    fi
    if [ -n "${OCF_RESKEY_source}" ]; then
	route_spec="${route_spec} src ${OCF_RESKEY_source}"
    fi
    if [ -n "${OCF_RESKEY_table}" ]; then
	route_spec="${route_spec} table ${OCF_RESKEY_table}"
    fi
    echo "$route_spec"
}

route_usage() {
	cat <<END
usage: $0 {start|stop|status|monitor|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

route_start() {
    route_status
    status=$?
    if [ $status -eq $OCF_SUCCESS ]; then
	ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : already started."
	return $OCF_SUCCESS
    fi
    route_spec="$(create_route_spec)"
    if ip route add $route_spec; then
	ocf_log info "${OCF_RESOURCE_INSTANCE} Added network route: $route_spec"
	return $OCF_SUCCESS
    else
	ocf_exit_reason "${OCF_RESOURCE_INSTANCE} Failed to add network route: $route_spec"
    fi
    return $OCF_ERR_GENERIC
}

route_stop() {
    route_status
    status=$?
    case $status in
	$OCF_SUCCESS)
	    route_spec="$(create_route_spec)"
	    if ip route del $route_spec; then
		ocf_log info "${OCF_RESOURCE_INSTANCE} Removed network route: $route_spec"
		return $OCF_SUCCESS
	    else
		ocf_exit_reason "${OCF_RESOURCE_INSTANCE} Failed to remove network route: $route_spec"
	    fi
	    ;;
	$OCF_NOT_RUNNING)
	    ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : already stopped."
	    return $OCF_SUCCESS
	    ;;
    esac
    return $OCF_ERR_GENERIC
}

route_status() {
    show_output="$(ip $addr_family route show $(create_route_spec) 2>/dev/null)"
    if [ $? -eq 0 ]; then
	if [ -n "$show_output" ]; then
	    # "ip route show" returned zero, and produced output on
	    # stdout. That is what we expect.
	    return $OCF_SUCCESS
	else
	    # "ip route show" returned zero, but produced no
	    # output on stdout. Assume the route was cleanly
	    # unconfigured.
	    return $OCF_NOT_RUNNING
	fi
    else
	# "ip route show" returned an error code. Assume something
	# went wrong.
	return $OCF_ERR_GENERIC
    fi
}

route_validate() {
    # If we're running as a clone, are the clone meta attrs OK?
    if [ "${OCF_RESKEY_CRM_meta_clone}" ]; then
	if [ "${OCF_RESKEY_CRM_meta_clone_node_max}" != 1 ]; then
	    ocf_exit_reason "Misconfigured clone parameters. Must set meta attribute \"clone_node_max\" to 1, got ${OCF_RESKEY_CRM_meta_clone_node_max}."
	    return $OCF_ERR_ARGS
	fi
    fi
    # Did we get a destination?
    if [ -z "${OCF_RESKEY_destination}" ]; then
	ocf_exit_reason "Missing required parameter \"destination\"."
	return $OCF_ERR_ARGS
    fi
    # Did we get either a device or a gateway address?
    if [ -z "${OCF_RESKEY_device}" -a -z "${OCF_RESKEY_gateway}" ]; then
	ocf_exit_reason "Must specifiy either \"device\", or \"gateway\", or both."
	return $OCF_ERR_ARGS
    fi
    # If a device has been configured, is it available on this system?
    if [ -n "${OCF_RESKEY_device}" ]; then
	if ! ip link show ${OCF_RESKEY_device} >/dev/null 2>&1; then
	    ocf_exit_reason "Network device ${OCF_RESKEY_device} appears not to be available on this system."
	    # OCF_ERR_ARGS prevents the resource from running anywhere at all,
	    # maybe another node has the interface?
            # OCF_ERR_INSTALLED just prevents starting on this particular node.
	    return $OCF_ERR_INSTALLED
	fi
    fi

    # The following tests must return $OCF_ERR_INSTALLED, but only if
    # the resource is actually running (i.e., not during probes)
    if ! ocf_is_probe; then
        # If a source address has been configured, is it available on
        # this system?
	if [ -n "${OCF_RESKEY_source}" ]; then
	    if ! ip address show | grep -w ${OCF_RESKEY_source} >/dev/null 2>&1; then
		ocf_exit_reason "Source address ${OCF_RESKEY_source} appears not to be available on this system."
	    # same reason as with _device:
		return $OCF_ERR_INSTALLED
	    fi
	fi
        # If a gateway address has been configured, is it reachable?
	if [ -n "${OCF_RESKEY_gateway}" ]; then
	    if ! ip route get ${OCF_RESKEY_gateway} >/dev/null 2>&1; then
		ocf_exit_reason "Gateway address ${OCF_RESKEY_gateway} is unreachable."
	    # same reason as with _device:
		return $OCF_ERR_INSTALLED
	    fi
	fi
    fi
    return $OCF_SUCCESS
}

# These two actions must always succeed
case $__OCF_ACTION in
meta-data)	meta_data
		# OCF variables are not set when querying meta-data
		exit 0
		;;
usage|help)	route_usage
		exit $OCF_SUCCESS
		;;
esac

# Don't do anything if the necessary utilities aren't present
for binary in ip grep; do
    check_binary $binary
done

route_validate || exit $?

case $OCF_RESKEY_destination in
*:*) addr_family="-6" ;;
  *) addr_family="-4" ;;
esac

case $__OCF_ACTION in
start)		route_start;;
stop)		route_stop;;
status|monitor)	route_status;;
reload)		ocf_log info "Reloading..."
	        route_start
		;;
validate-all)	;;
*)		route_usage
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac
rc=$?
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION returned $rc"
exit $rc
