[package] base-files: add a hotplug handler for rdate

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20518 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 46 insertions, 0 deletions

diff --git a/package/base-files/files/etc/hotplug.d/iface/40-rdate b/package/base-files/files/etc/hotplug.d/iface/40-rdate
new file mode 100644
index 0000000000..cf56c02ac5
--- /dev/null
+++ b/package/base-files/files/etc/hotplug.d/iface/40-rdate
@@ -0,0 +1,46 @@
+uci_get_one()
+{
+	for var in "$@"; do
+		uci -P /var/state get "$var" 2>/dev/null && break
+	done
+}
+
+rand()
+{
+	random=$(awk 'BEGIN { srand(); print int(rand() * 10 + 1); }')
+}
+
+sync_rdate()
+{
+	local servers=$(uci_get_one "network.$INTERFACE.lease_timesrv" \
+		"system.@rdate[0].server")
+
+	if [ -n "$servers" ]; then
+		match=0
+		tries=3
+		rand
+
+		while [ $match = 0 ] && [ $tries != 0 ]; do
+			for server in $servers; do
+				if [ $((--random)) = 0 ]; then
+					rdate -s $server >/dev/null 2>/dev/null && {
+						logger -t rdate "Synced with $server"
+						match=1
+					} || {
+						logger -t rdate "Failed to sync with $server"
+						let tries="$tries - 1"
+						rand
+					}
+
+					break
+				fi
+			done
+		done
+	else
+		logger -t rdate "No usable time server found"
+	fi
+}
+
+case "$ACTION" in
+	ifup) route -n | grep -q ^0.0.0.0 && sync_rdate;;
+esac