Use $VPNPID when provided by OpenConnect

See https://gitlab.com/openconnect/openconnect/-/merge_requests/278.  Once
merged, OpenConnect will send its PID to the vpnc-script as $VPNPID.  The
vpnc-script should use this in preference to trying to figure out its
grandparent's PID on its own.

Signed-off-by: Daniel Lenski <dlenski@gmail.com>

diff --git a/vpnc-script b/vpnc-script
index c58d4e2ed07b4ca0734436fc2126b83d05775bb3..3ebb56d96628f13834aff6969b41fe8fe255999a 100755 (executable)
--- a/vpnc-script
+++ b/vpnc-script
@@ -23,6 +23,7 @@
 # List of parameters passed through environment
 #* reason                       -- why this script was called, one of: pre-init connect disconnect reconnect attempt-reconnect
 #* VPNGATEWAY                   -- VPN gateway address (always present)
+#* VPNPID                       -- PID of the processing controlling the VPN (OpenConnect v9.0+)
 #* TUNDEV                       -- tunnel device (always present)
 #* IDLE_TIMEOUT                        -- gateway's idle timeout in seconds (OpenConnect v8.06+); unused
 #* INTERNAL_IP4_ADDRESS         -- address (always present)
@@ -92,11 +93,14 @@ HOOKS_DIR=/etc/vpnc
 # Use the PID of the controlling process (vpnc or OpenConnect) to
 # uniquely identify this VPN connection. Normally, the parent process
 # is a shell, and the grandparent's PID is the relevant one.
-VPNPID=$PPID
-PCMD=`ps -c -o cmd= -p $PPID`
-case "$PCMD" in
-    *sh) VPNPID=`ps -o ppid= -p $PPID` ;;
-esac
+# OpenConnect v9.0+ provides VPNPID, so we don't need to determine it.
+if [ -z "$VPNPID " ]; then
+    VPNPID=$PPID
+    PCMD=`ps -c -o cmd= -p $PPID`
+    case "$PCMD" in
+        *sh) VPNPID=`ps -o ppid= -p $PPID` ;;
+    esac
+fi
 
 DEFAULT_ROUTE_FILE=/var/run/vpnc/defaultroute.${VPNPID}
 DEFAULT_ROUTE_FILE_IPV6=/var/run/vpnc/defaultroute_ipv6.${VPNPID}