File ifup-route of Package openstack-octavia
#!/bin/bash
# Copyright (c) 2018 SuSE Linux AG Nuernberg, Germany. All rights reserved.
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author: Marius Tomaschewski <mt@suse.de>
# Swaminathan Vasudevan <svasudevan@suse.com>
# Based on rcroute: Burchard Steinbild <bs@suse.de>, 1996
# Werner Fink <werner@suse.de>, 1996-2000
#
# $Id$
#
usage () {
echo $@
echo "Usage: if{up,down}-route [<config>] <interface> [-o <options>]"
echo ""
echo "Options are:"
echo " dhcp : we are called from dhcp client (read only ifroute-*)"
echo "All other or wrong options are silently ignored"
exit $R_USAGE
}
SCRIPTNAME=${0##*/}
case "$SCRIPTNAME" in
ifup-route) ACTION=replace ;;
ifdown-route) ACTION=del ;;
*) usage
esac
case "$1" in ""|-h|*help*) usage; esac
CONFIG=$1
shift
if [ -n "$1" -a "$1" != "-o" ] ; then
INTERFACE=$1
else
INTERFACE=$CONFIG
fi
shift
test "$1" = "-o" && shift
OPTIONS="$@"
MODE=manual
while [ $# -gt 0 ]; do
case $1 in
boot|onboot) MODE=auto ;;
hotplug) MODE=auto ;;
rc) export RUN_FROM_RC=yes
SUPPRESS_ERROR_MESSAGE=yes ;;
quiet) be_quiet_has_gone ;;
dhcp) DHCP=yes ;;
*) echo "unknown option $1 ignored" ;;
esac
shift
done
# The global route configuration file must not be read if we were called from
# dhcp client. In this case we only read the ifroute-* file.
if [ "$DHCP" != yes ] ; then
ROUTECONF=routes
fi
test -f $ROUTECONF || ROUTECONF=""
EXTRAROUTECONF=ifroute-$CONFIG
test -f $EXTRAROUTECONF || EXTRAROUTECONF=""
read_routes() {
test -r "$1" || return
local DEST GWAY MASK IFACE OPTS
while read DEST GWAY MASK NDEV OPTS; do
test -z "$GWAY" && GWAY=-
test -z "$MASK" && MASK=-
test -z "$IFACE" -o "$IFACE" = "-" && IFACE="$INTERFACE"
echo $DEST $GWAY $MASK $NDEV $OPTS
done < <(cat "$1" ; echo)
}
is_iface_up () {
test -z "$1" && return 1
test -d /sys/class/net/$1 || return 1
case "`LC_ALL=POSIX ip link show $1 2>/dev/null`" in
*$1*UP*) ;;
*) return 1 ;;
esac
}
filter_routes()
{
LANG=C LC_ALL=C gawk -vrp="$ROUTE_PROTOS" -- \
'/proto [^ ]+/ {
if(length(rp) > 0 && match($0,"proto ("rp")")) {
print $0;
}
next;
}
{ print $0;}'
}
pop_route_stack () {
# The default route stack consists of files named route-stack-<i>-<X>-<Y>.
# If the topmost entry (with highest i) has for Y the current interface, then
# the current interface hosts the current default route. We can look for the
# current default route interface via 'ip route', but in one case thsi does not
# work.
# NICs that are handled by '/sbin/hotplug' (cardmgr behaves different) loose
# their registered interface immediately when the NIC is ejected. Therefore
# we must get the name of the current default route interface from the stack
# itself and not via 'ip route'.
local f g # variables for route-stack-* filenames
# At first look for the current default route interface via 'ip route' and store
# it in $DR_IFACE.
set -- `ip -4 route show | filter_routes`
while [ "$1" != default -a $# -gt 0 ] ; do shift; done
while [ "$1" != dev -a $# -gt 0 ] ; do shift; done
DR_IFACE=$2
if [ -z "$DR_IFACE" ] ; then
# Get the latest stack entry (with highest number)
for f in $ROUTESTACKDIR/route-stack-*-*-* ; do true; done
IFS=-; set -- $f; DR_IFACE=$5; unset IFS
fi
# If $DR_IFACE equals $INTERFACE we have to restore the previous default
# route. That means we look for the newest route-stack-X-$INTERFACE (which in
# this case should be the newest route-stack-X-*). This file may be deleted
# after the default route via dev X was restored.
#
# Then we look for the newest route-stack-$INTERFACE-X and again for the now
# newest route-stack-Y-$INTERFACE. If X==Y these files may just be deleted.
# If X!=Y and there is no route-stack-Y-X we have to copy
# route-stack-Y-$INTERFACE to route-stack-Y-X and delete the two old files
# afterwards.
# Repeat that until no more route-stack-*-$INTERFACE exists.
#
# Finally remove all route-stack-$INTERFACE-*.
#
if [ "$DR_IFACE" = "$INTERFACE" ] ; then
local restore_nullglob="$(shopt -p nullglob)"
shopt -s nullglob
for f in $ROUTESTACKDIR/route-stack-*-*-${INTERFACE} ; do true; done
eval $restore_nullglob
IFS=-; set -- $f; OLDDEFROUTEIFACE=$4; unset IFS
read OLDDEFROUTEARGS < ${f:-<(echo)}
fi
while true ; do
for f in $ROUTESTACKDIR/route-stack-*-*-${INTERFACE} ; do true; done
for g in $ROUTESTACKDIR/route-stack-*-${INTERFACE}-* ; do true; done
test -f "$f" -a -f "$g" || break
IFS=-
set -- $f ; fi=$4
set -- $g ; gi=$5
unset IFS
if [ "$fi" != "$gi" ] ; then
declare -i i
read i < $ROUTESTACKDIR/route-stack-number
i=$((i+1))
echo $i > $ROUTESTACKDIR/route-stack-number
ii=`printf "%.6d\n" $i`
cp -v $f $ROUTESTACKDIR/route-stack-$ii-${fi}-${gi}
fi
rm -vf $f $g
done
test -z "$OLDDEFROUTEARGS" && return 1
test -z "$OLDDEFROUTEIFACE" && return
is_iface_up $OLDDEFROUTEIFACE && return || return 1
}
reverse ()
{
local LINE
while read -r LINE ; do
case "$LINE" in \#*|"") continue ;; esac
test "$ACTION" = "del" && reverse
echo "$LINE"
done
}
while read DEST GWAY MASK NDEV OPTS ; do
case $DEST in ""|\#*) continue ;; esac
case $GWAY in -) unset GWAY ;; esac
case $MASK in -) unset MASK ;; esac
case $NDEV in -) unset NDEV ;; esac
case $OPTS in -) unset OPTS ;; esac
ifname=${ifname:-$NDEV}
if [ "$ACTION" == "replace" ]; then
case $GWAY$ifname in "") continue ;; esac
case $GWAY in
*:*) ver="-6" ;;
*.*) ver="-4" ;;
*) case $DEST in
*:*) ver="-6" ;;
*.*) ver="-4" ;;
esac ;;
esac
/bin/ip ${ver} route replace \
${DEST}${GWAY:+ via $GWAY }${ifname:+ dev $ifname }${OPTS}
## TODO: catch false errors
fi
if [ "$ACTION" == "del" ]; then
pop_route_stack && /bin/ip route replace to $OLDDEFROUTEARGS
fi
done < <(reverse < <(${ROUTECONF:+cat $ROUTECONF}; echo; \
read_routes $EXTRAROUTECONF) )
exit 0
