samba: add file/interface reload triggers & filter interfaces

* Only parse interfaces that are up during init_config (as the
  script depends on this to determine the proper IP/subnet range)
* Add reload interface triggers for samba-designated interfaces
* Force full service restart upon config change to ensure Samba
  binds to new interfaces (sending HUP signal doesn't work)
* Rename "interface" variable to "samba_iface" and move into
  global scope

Needed to fix Samba connectivity for clients connecting from a
different LAN subnet (e.g. pseudobridge configurations) due to the
'bind interfaces only' setting.

Signed-off-by: Conn O'Griofa <connogriofa@gmail.com>

package/network/services/samba36/files/samba.init

@@ -5,16 +5,16 @@ START=60
 USE_PROCD=1
 
 smb_header() {
-	local interface
-	config_get interface $1 interface "loopback lan"
+	config_get samba_iface $1 interface "loopback lan"
 
 	# resolve interfaces
 	local interfaces=$(
 		. /lib/functions/network.sh
 
 		local net
-		for net in $interface; do
+		for net in $samba_iface; do
 			local device
+			network_is_up $net || continue
 			network_get_device device "$net" && {
 				local subnet
 				network_get_subnet  subnet "$net" && echo -n "$subnet "
@@ -93,14 +93,13 @@ init_config() {
 	config_foreach smb_add_share sambashare
 }
 
-reload_service() {
-	init_config
-
-	killall -HUP smbd
-}
-
 service_triggers() {
 	procd_add_reload_trigger samba
+
+	local i
+	for i in $samba_iface; do
+		procd_add_reload_interface_trigger $i
+	done
 }
 
 start_service() {
@@ -109,10 +108,12 @@ start_service() {
 	procd_open_instance
 	procd_set_param command /usr/sbin/smbd -F
 	procd_set_param respawn
+	procd_set_param file /var/etc/smb.conf
 	procd_close_instance
 
 	procd_open_instance
 	procd_set_param command /usr/sbin/nmbd -F
 	procd_set_param respawn
+	procd_set_param file /var/etc/smb.conf
 	procd_close_instance
 }