base-files: add a hotplug handler for rdate

SVN-Revision: 20518

package/base-files/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=base-files
-PKG_RELEASE:=40
+PKG_RELEASE:=41
 
 PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
 

package/base-files/files/etc/config/system

@@ -1,3 +1,12 @@
 config system
 	option hostname	OpenWrt
 	option timezone	UTC
+
+config rdate
+	list server ac-ntp0.net.cmu.edu
+	list server ptbtime1.ptb.de
+	list server ac-ntp1.net.cmu.edu
+	list server ntp.xs4all.nl
+	list server ptbtime2.ptb.de
+	list server cudns.cit.cornell.edu
+	list server ptbtime3.ptb.de

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