[OpenWrt-Devel] [PATCH 1/1] use NTP server received via DHCP

[amine ahd]

---
 package/utils/busybox/Makefile             |  3 ++
 package/utils/busybox/files/sysntpd        | 26 ++++++++++-
 package/utils/busybox/files/sysntpd.hotplug    | 53 ++++++++++++++++++++++
 3 files changed, 80 insertions(+), 2 deletions(-)
 create mode 100755 package/utils/busybox/files/sysntpd.hotplug

diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index 9571d48..3c33246 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -112,6 +112,9 @@ define Package/busybox/install
 	$(INSTALL_BIN) ./files/cron $(1)/etc/init.d/cron
 	$(INSTALL_BIN) ./files/telnet $(1)/etc/init.d/telnet
 	$(INSTALL_BIN) ./files/sysntpd $(1)/etc/init.d/sysntpd
+	$(INSTALL_DIR) $(1)/etc/hotplug.d
+	$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
+	$(INSTALL_BIN) ./files/sysntpd.hotplug $(1)/etc/hotplug.d/iface/30-sysntpd
 	$(INSTALL_BIN) ./files/ntpd-hotplug $(1)/usr/sbin/ntpd-hotplug
 	-rm -rf $(1)/lib64
 endef
diff --git a/package/utils/busybox/files/sysntpd b/package/utils/busybox/files/sysntpd
index f73bb83..cc75cf9 100755
--- a/package/utils/busybox/files/sysntpd
+++ b/package/utils/busybox/files/sysntpd
@@ -1,6 +1,8 @@
 #!/bin/sh /etc/rc.common
 # Copyright (C) 2011 OpenWrt.org
 
+. /lib/functions.sh
+. /usr/share/libubox/jshn.sh
 START=98
 
 USE_PROCD=1
@@ -22,12 +24,32 @@ start_service() {
 
 	[ $enabled = 0 ] && return
 
-	[ -z "$server" ] && return
-
 	procd_open_instance
 	procd_set_param command "$PROG" -n
 	[ "$enable_server" = "1" ] && procd_append_param command -l
 	[ -x "$HOTPLUG_SCRIPT" ] && procd_append_param command -S "$HOTPLUG_SCRIPT"
+
+	local use_dhcp="$(uci -q get system.ntp.use_dhcp)"
+	local dhcp_ifaces="$(uci -q get system.ntp.dhcp_ifaces)"
+	[ "$use_dhcp" = 1 ] && {
+		if [ -z "$dhcp_ifaces" ]; then
+			local dump=$(ubus call network.interface dump)
+			ntpservers=$(jsonfilter -s "$dump" -e '$["interface"][*]["data"]["ntpserver"]')
+		else
+			for iface in $dhcp_ifaces; do
+				local status=$(ubus call network.interface.$iface status)
+				local ntpserver=$(jsonfilter -s "$status" -e '$["data"]["ntpserver"]')
+				[ -n "$ntpserver" ] && \\
+					ntpservers="$ntpservers $ntpserver"
+			done
+		fi
+		# add this data so we can use it in the sysntpd hotplug script.
+		procd_set_param data ntp_servers="$ntpservers $server"
+		for ntpserver in $ntpservers; do
+			procd_append_param command -p $ntpserver
+		done
+	}
+
 	for peer in $server; do
 		procd_append_param command -p $peer
 	done
diff --git a/package/utils/busybox/files/sysntpd.hotplug b/package/utils/busybox/files/sysntpd.hotplug
new file mode 100755
index 0000000..c0d0f37
--- /dev/null
+++ b/package/utils/busybox/files/sysntpd.hotplug
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+. /lib/functions.sh
+. /usr/share/libubox/jshn.sh
+
+is_valid_interface() {
+	local list=$(uci get system.ntp.dhcp_ifaces)
+	[ -z "$list" ] && return 0
+
+	case " $list " in
+		*" $INTERFACE "*)
+			return 0
+		;;
+		*)
+			return 1
+		;;
+	esac
+}
+
+local proto="$(uci get network.$INTERFACE.proto)"
+local use_dhcp="$(uci -q get system.ntp.use_dhcp)"
+[ "$use_dhcp" = 1 ] && [ "$ACTION" = ifup ] && is_valid_interface && [ "$proto" = dhcp -o "$proto" = dhcp6 ] || exit 0
+
+handle_default_ntp_servers() {
+	local server="$1"
+	new_ntp_servers="$new_ntp_servers $server"
+}
+
+local dhcp_ifaces="$(uci -q get system.ntp.dhcp_ifaces)"
+if [ -z "$dhcp_ifaces" ]; then
+	local dump=$(ubus call network.interface dump)
+	local dhcp_ntp_servers=$(jsonfilter -s "$dump" -e '$["interface"][*]["data"]["ntpserver"]')
+else
+	for iface in $dhcp_ifaces; do
+		local status=$(ubus call network.interface.$iface status)
+		local ntpserver=$(jsonfilter -s "$status" -e '$["data"]["ntpserver"]')
+		[ -n "$ntpserver" ] && \\
+			dhcp_ntp_servers="dhcp_ntp_servers $ntpserver"
+	done
+fi
+
+new_ntp_servers="$dhcp_ntp_servers"
+#get the default list of ntp servers from the config file and append it to the new list
+config_load system
+config_list_foreach "ntp" "server" handle_default_ntp_servers
+
+#get the current list of ntp servers in the running instance
+local current_ntp_servers=$(ubus call service list '{"name":"sysntpd", "verbose":true}' | jsonfilter -e '$["sysntpd"]["instances"][*]["data"]["ntp_servers"]')
+#if its an up action, the iface uses DHCP and the new list of ntp servers is different from the old, restart sysntpd
+[ "$current_ntp_servers" != "$new_ntp_servers" ] || exit 0
+
+logger -t sysntpd "Reloading sysntpd due to $ACTION of interface $INTERFACE and a change of NTP servers"
+/etc/init.d/sysntpd enabled && /etc/init.d/sysntpd reload
-- 
2.5.0
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