[PATCH 21.02] busybox: sysntpd: option to bind server to iface

[Alexey Dobrovolsky]

NTPD in busybox has option -I to bind server to IFACE.
However, capabilities of the busybox are limited, the -I option cannot be
repeated and only one interface can be effectively specified in it.
This option is currently not configurable via UCI.
The patch adds an interface option to the system config, ntp section.
Also sort options for uci_load_validate alphabetically.

Signed-off-by: Alexey Dobrovolsky <dobrovolskiy.alexey at gmail.com>
(cherry picked from commit e12fcf0fe5597467f7cc21144e5f4da60500ebd2)
---
 package/utils/busybox/files/sysntpd | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/package/utils/busybox/files/sysntpd b/package/utils/busybox/files/sysntpd
index e4a070762f..c4c311c242 100755
--- a/package/utils/busybox/files/sysntpd
+++ b/package/utils/busybox/files/sysntpd
@@ -30,7 +30,12 @@ get_dhcp_ntp_servers() {
 
 validate_ntp_section() {
 	uci_load_validate system timeserver "$1" "$2" \
-		'server:list(host)' 'enabled:bool:1' 'enable_server:bool:0' 'use_dhcp:bool:1' 'dhcp_interface:list(string)'
+		'dhcp_interface:list(string)' \
+		'enable_server:bool:0' \
+		'enabled:bool:1' \
+		'interface:string' \
+		'server:list(host)' \
+		'use_dhcp:bool:1'
 }
 
 start_ntpd_instance() {
@@ -49,7 +54,10 @@ start_ntpd_instance() {
 
 	procd_open_instance
 	procd_set_param command "$PROG" -n -N
-	[ "$enable_server" = "1" ] && procd_append_param command -l
+	if [ "$enable_server" = "1" ]; then
+		procd_append_param command -l
+		[ -n "$interface" ] && procd_append_param command -I $interface
+	fi
 	[ -x "$HOTPLUG_SCRIPT" ] && procd_append_param command -S "$HOTPLUG_SCRIPT"
 	for peer in $server; do
 		procd_append_param command -p $peer
-- 
2.25.1