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|
#!/bin/sh -e
#
# Script used to configure vRouter interface
ARG_BRIDGE=b
ARG_HELP=h
OPTS=:${ARG_BRIDGE}${ARG_HELP}
USAGE="\
create-vrouter [-${ARG_BRIDGE}${ARG_HELP}] [interface]
Options:
-$ARG_BRIDGE remove bridge from interface if exists
-$ARG_HELP print this message"
configVRouter()
{
cat juju-header
if [ -s "$2" ]; then
printf "\n%s\n" "auto $1"
cat "$2"
elif [ ! -e "$2" ]; then
printf "\n%s\n%s\n" "auto $1" "iface $1 inet manual"
fi
printf "\n%s\n" "auto vhost0"
if [ -e "$3" ]; then
cat "$3"
else
echo "iface vhost0 inet dhcp"
fi
cat <<-EOF
pre-up ip link add vhost0 address \$(cat /sys/class/net/$1/address) type vhost
pre-up vif --add $1 --mac \$(cat /sys/class/net/$1/address) --vrf 0 --vhost-phys --type physical
pre-up vif --add vhost0 --mac \$(cat /sys/class/net/$1/address) --vrf 0 --type vhost --xconnect $1
post-down vif --list | awk '/^vif.*OS: vhost0/ {split(\$1, arr, "\\/"); print arr[2];}' | xargs vif --delete
post-down vif --list | awk '/^vif.*OS: $1/ {split(\$1, arr, "\\/"); print arr[2];}' | xargs vif --delete
post-down ip link delete vhost0
EOF
}
configureInterfaces()
{
for cfg in /etc/network/interfaces /etc/network/interfaces.d/*.cfg \
/etc/network/*.config; do
# for each network interfaces config, extract the config for
# the chosen interface whilst commenting it out in the
# subsequent replacement config
[ -e "$cfg" ] || continue
awk -v interface=$1 -v interface_cfg=$TMP/interface.cfg \
-v vrouter_cfg=$TMP/vrouter.cfg -f vrouter-interfaces.awk \
"$cfg" > $TMP/interfaces.cfg
if ! diff $TMP/interfaces.cfg "$cfg" > /dev/null; then
# create backup
mv "$cfg" "$cfg.save"
# substitute replacement config for original config
{ cat juju-header; echo; cat $TMP/interfaces.cfg; } > "$cfg"
fi
done
if [ -e $TMP/interface.cfg ]; then
# strip whitespace
sed -En -e '1h;1!H;${g;s/[[:space:]]+$//;p}' -i \
$TMP/interface.cfg
fi
}
configureInterfacesDir()
{
# add interfaces.d source line to /etc/network/interfaces
if ! grep -q '^[[:blank:]]*source /etc/network/interfaces\.d/\*\.cfg[[:blank:]]*$' \
/etc/network/interfaces; then
printf "\n%s\n" "source /etc/network/interfaces.d/*.cfg" \
>> /etc/network/interfaces
# it's possible for conflicting network config to exist in
# /etc/network/interfaces.d when we start sourcing it
# so disable any config as a precautionary measure
for cfg in /etc/network/interfaces.d/*.cfg; do
[ -e "$cfg" ] || continue
mv "$cfg" "$cfg.old"
done
fi
mkdir -p /etc/network/interfaces.d
}
configureVRouter()
{
if [ $# = 1 ]; then
iface_down=$1
iface_delete=$1
iface_up=$1
iface_cfg=$TMP/interface.cfg
else
iface_down="$1 $2"
iface_delete=$2
iface_up=$1
iface_cfg=/dev/null
fi
ifacedown $iface_down vhost0; sleep 5
configureInterfacesDir
configureInterfaces $iface_delete
configVRouter $iface_up $iface_cfg $TMP/vrouter.cfg \
> /etc/network/interfaces.d/vrouter.cfg
ifaceup $iface_up vhost0
restoreRoutes
}
ifacebridge()
{
for cfg in /etc/network/interfaces /etc/network/interfaces.d/*.cfg \
/etc/network/*.config; do
# extract all the bridges with interface as port
# and all interfaces marked auto
[ -e "$cfg" ] || continue
awk -v interface=$1 \
-v auto_interfaces=$TMP/auto_interfaces \
-v bridge_interfaces=$TMP/bridge_interfaces \
-f bridges.awk "$cfg"
done
if [ -e $TMP/bridge_interfaces ]; then
# output the bridge marked auto
grep -m 1 -f $TMP/bridge_interfaces $TMP/auto_interfaces
fi
}
ifacedown()
{
for iface; do
# ifdown interface
# if bridge, save list of interfaces
# if bond, save list of slaves
if [ ! -e /sys/class/net/$iface ]; then
continue
fi
[ -d /sys/class/net/$iface/bridge ] && saveIfaces $iface
[ -d /sys/class/net/$iface/bonding ] && saveSlaves $iface
ifdown -v --force $iface
done
}
ifaceup()
{
for iface; do
# ifup interface
# if bridge, restore list of interfaces
# restore list of slaves if exists (bond)
restoreSlaves $iface
ifup -v $iface
[ -d /sys/class/net/$iface/bridge ] && restoreIfaces $iface
done
return 0
}
restoreRoutes()
{
if [ -e /etc/network/routes ]; then
service networking-routes stop
service networking-routes start
fi
}
restoreIfaces()
{
if [ -e $TMP/$1.ifaces ]; then
cat $TMP/$1.ifaces | xargs -n 1 brctl addif $1 || true
fi
}
restoreSlaves()
{
if [ -e $TMP/$1.slaves ]; then
cat $TMP/$1.slaves | xargs ifup
fi
}
saveIfaces()
{
if [ -z "$(find /sys/class/net/$1/brif -maxdepth 0 -empty)" ]; then
find /sys/class/net/$1/brif | tail -n +2 | xargs -n 1 basename \
> $TMP/$1.ifaces
fi
}
saveSlaves()
{
if [ -s /sys/class/net/$1/bonding/slaves ]; then
cat /sys/class/net/$1/bonding/slaves | tr " " "\n" \
> $TMP/$1.slaves
fi
}
usage()
{
if [ $# -gt 0 ]; then
fd=$1
else
fd=1
fi
echo "$USAGE" >&$fd
}
usageError()
{
echo "$1" >&2
usage 2
exit 1
}
while getopts $OPTS opt; do
case $opt in
$ARG_BRIDGE)
remove_bridge=true
;;
$ARG_HELP)
usage
exit 0
;;
"?")
usageError "Unknown argument: $OPTARG"
;;
esac
done
shift $(($OPTIND - 1))
if [ $# -gt 1 ]; then
usageError "Too many arguments"
fi
TMP=$(mktemp -d /tmp/create-vrouter.XXX)
if [ $# -ne 0 ]; then
bridge=$(ifacebridge $1)
if [ -n "$bridge" ]; then
if [ -n "$remove_bridge" ]; then
configureVRouter $1 $bridge
else
configureVRouter $bridge
fi
else
configureVRouter $1
fi
else
# use default gateway interface
gateway=$(route -n | awk '$1 == "0.0.0.0" { print $8 }')
if [ -d /sys/class/net/$gateway/bridge ] \
&& [ -z "$(find /sys/class/net/$gateway/brif -maxdepth 0 -empty)" ] \
&& [ -n "$remove_bridge" ]; then
interface=$(find /sys/class/net/$gateway/brif | sed -n -e '2p' | xargs basename)
configureVRouter $interface $gateway
else
configureVRouter $gateway
fi
fi
rm -rf $TMP
|
