Add a script to save static route configuration in properties.

I'm intentionally keeping this out of the default configuration.

Change-Id: Ic1152aedbf54e11c3a3a7c985ade6a47dffc07ae

1 files changed, 61 insertions, 0 deletions

diff --git a/dhcpcd-hooks/25-static-routes.conf b/dhcpcd-hooks/25-static-routes.conf
new file mode 100755
index 0000000..2f6869e
--- /dev/null
+++ b/dhcpcd-hooks/25-static-routes.conf
@@ -0,0 +1,61 @@
+# Set dhcp.<iface>.routeN.dest and dhcp.<iface>.routeN.via properties with
+# the static routes provided by the DHCP server.
+
+# CAUTION
+#
+# Placing this in the hooks directory will allow DHCP servers to push static
+# routes to ALL of the interfaces that use the directory.
+#
+# To avoid this, create separate dhcpcd configurations, one for the interfaces
+# that should accept static routes and another for the interfaces that should
+# not accept static routes routes.
+
+# Add this script in the hooks directory only for the interfaces that should
+# accept static routes.
+#
+# Add "nooption classless_static_routes, static_routes" to the dhcpcd.conf
+# file for the interfaces that should not accept static routes. Do not add the
+# script to the hooks directory.
+
+next_set_interface=1
+
+set_route_props_from_list()
+{
+    while [[ $# -ge 2 ]]; do
+        setprop dhcp.${interface}.route${next_set_interface}.dest $1
+	shift
+        setprop dhcp.${interface}.route${next_set_interface}.via $1
+	shift
+        next_set_interface=$(($next_set_interface + 1))
+    done
+}
+
+unset_route_props()
+{
+    next_clear_interface=1
+    while [[ ! -z "$(getprop dhcp.${interface}.route${next_clear_interface}.dest)" ]]; do
+      setprop dhcp.${interface}.route${next_clear_interface}.dest ""
+      setprop dhcp.${interface}.route${next_clear_interface}.via ""
+      next_clear_interface=$(($next_clear_interface + 1))
+    done
+    while [[ ! -z "$(getprop dhcp.${interface}.route${next_clear_interface}.via)" ]]; do
+      setprop dhcp.${interface}.route${next_clear_interface}.dest ""
+      setprop dhcp.${interface}.route${next_clear_interface}.via ""
+      next_clear_interface=$(($next_clear_interface + 1))
+    done
+}
+
+set_route_props()
+{
+    unset_route_props
+    if [[ ! -z "${new_classless_static_routes}" ]]; then
+        set_route_props_from_list ${new_classless_static_routes}
+    else
+        set_route_props_from_list ${new_static_routes}
+    fi
+}
+
+case "${reason}" in
+BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT)       set_route_props;;
+EXPIRE|FAIL|IPV4LL|RELEASE|STOP)                unset_route_props;;
+esac