Add helper functions to get network device and gateway of default route of our
Internet uplink (not the VPN tunnel). (As bonus, we have get_default_dev for
/sbin/route mode to get information about currently active default route just
to complement get_default_gw.)
Signed-off-by: Gernot Hillier <gernot.hillier at siemens.com>
---
vpnc-script | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/vpnc-script b/vpnc-script
index 75e1cda..d04bba9 100755
--- a/vpnc-script
+++ b/vpnc-script
@@ -223,6 +223,15 @@ destroy_tun_device() {
# =========== route handling ====================================
if [ -n "$IPROUTE" ]; then
+ get_uplink_gw() {
+ # route to VPNGATEWAY is always our uplink, independent if VPN tunnel is active or not
+ $IPROUTE route get "$VPNGATEWAY" | sed -ne 's/^.*via \([a-z0-9\.]*\).*$/\1/p'
+ }
+
+ get_uplink_dev() {
+ $IPROUTE route get "$VPNGATEWAY" | sed -ne 's/^.*dev \([a-z0-9]*\).*$/\1/p'
+ }
+
fix_ip_get_output () {
sed -e 's/ /\n/g' | \
sed -ne '1p;/via/{N;p};/dev/{N;p};/src/{N;p};/mtu/{N;p}'
@@ -312,6 +321,31 @@ else # use route command
netstat -r -n | awk '/:/ { next; } /^(default|0\.0\.0\.0)/ { print $2; }'
}
+ get_uplink_gw() {
+ # If we have a specific route to VPNGATEWAY, then this is our
+ # Internet uplink (VPN tunnel active). If tunnel is not active,
+ # then the default route should be our uplink.
+ uplink_route=`netstat -r -n | grep "^$VPNGATEWAY"`
+ if [ -n "$uplink_route" ]; then
+ echo "$uplink_route" | awk '{ print $2; }'
+ else
+ get_default_gw
+ fi
+ }
+
+ get_default_dev() {
+ netstat -r -n | awk '/:/ { next; } /^(default|0\.0\.0\.0)/ { print $8; }'
+ }
+
+ get_uplink_dev() {
+ uplink_route=`netstat -r -n | grep "^$VPNGATEWAY"`
+ if [ -n "$uplink_route" ]; then
+ echo "$uplink_route" | awk '{ print $8; }'
+ else
+ get_default_dev
+ fi
+ }
+
set_vpngateway_route() {
route add -host "$VPNGATEWAY" $route_syntax_gw "`get_default_gw`"
}
--
2.12.3
