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Diffstat (limited to 'src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper')
-rw-r--r--src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper b/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper
new file mode 100644
index 000000000..59f92703c
--- /dev/null
+++ b/src/etc/dhcp/dhclient-enter-hooks.d/03-vyos-ipwrapper
@@ -0,0 +1,76 @@
+# redefine ip command to use FRR when it is available
+
+# get status of FRR
+function frr_alive () {
+ /usr/lib/frr/watchfrr.sh all_status
+ if [ "$?" -eq "0" ] ; then
+ logmsg info "FRR status: running"
+ return 0
+ else
+ logmsg info "FRR status: not running"
+ return 1
+ fi
+}
+
+# convert ip route command to vtysh
+function iptovtysh () {
+ # prepare variables for vtysh command
+ VTYSH_DISTANCE="210"
+ VTYSH_TAG="210"
+ # convert default route to 0.0.0.0/0
+ if [ "$4" == "default" ] ; then
+ VTYSH_NETADDR="0.0.0.0/0"
+ else
+ VTYSH_NETADDR=$4
+ fi
+ # add /32 to ip addresses without netmasks
+ if [[ ! $VTYSH_NETADDR =~ ^.*/[[:digit:]]+$ ]] ; then
+ VTYSH_NETADDR="$VTYSH_NETADDR/32"
+ fi
+ # get gateway address
+ if [ "$5" == "via" ] ; then
+ VTYSH_GATEWAY=$6
+ fi
+ # get device name
+ if [ "$5" == "dev" ]; then
+ VTYSH_DEV=$6
+ elif [ "$7" == "dev" ]; then
+ VTYSH_DEV=$8
+ fi
+ VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE"
+ # delete route if the command is "del"
+ if [ "$3" == "del" ] ; then
+ VTYSH_CMD="no $VTYSH_CMD"
+ fi
+ logmsg info "Converted vtysh command: \"$VTYSH_CMD\""
+}
+
+# delete the same route from kernel before adding new one
+function delroute () {
+ logmsg info "Checking if the route presented in kernel: $@"
+ if /usr/sbin/ip route show $@ | grep -qx "$1 " ; then
+ logmsg info "Deleting IP route: \"/usr/sbin/ip route del $@\""
+ /usr/sbin/ip route del $@
+ fi
+}
+
+# replace ip command with this wrapper
+function ip () {
+ # pass comand to system `ip` if this is not related to routes change
+ if [ "$2" != "route" ] ; then
+ logmsg info "Passing command to /usr/sbin/ip: \"$@\""
+ /usr/sbin/ip $@
+ else
+ # if we want to work with routes, try to use FRR first
+ if frr_alive ; then
+ delroute ${@:4}
+ iptovtysh $@
+ logmsg info "Sending command to vtysh"
+ vtysh -c "conf t" -c "$VTYSH_CMD"
+ else
+ # add ip route to kernel
+ logmsg info "Modifying routes in kernel: \"/usr/sbin/ip $@\""
+ /usr/sbin/ip $@
+ fi
+ fi
+}