package/knock: add knockd option

Add knockd option to make libpcap and MMU optional and enable it by
default for backward compatibility

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/knock/Config.in

@@ -1,7 +1,5 @@
 config BR2_PACKAGE_KNOCK
 	bool "knock"
-	depends on BR2_USE_MMU # fork()
-	select BR2_PACKAGE_LIBPCAP
 	help
 	  A port knocking implementation.
 	  Provides a daemon and a user application. Port knocking can be
@@ -11,3 +9,15 @@ config BR2_PACKAGE_KNOCK
 	  firewall.
 
 	  http://www.zeroflux.org/projects/knock
+
+if BR2_PACKAGE_KNOCK
+
+config BR2_PACKAGE_KNOCK_KNOCKD
+	bool "knockd"
+	default y
+	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBPCAP
+	help
+	  Enable knockd
+
+endif

package/knock/knock.mk

@@ -9,10 +9,15 @@ KNOCK_SITE = $(call github,jvinet,knock,v$(KNOCK_VERSION))
 KNOCK_AUTORECONF = YES
 KNOCK_LICENSE = GPL-2.0+
 KNOCK_LICENSE_FILES = COPYING
-KNOCK_DEPENDENCIES = libpcap
 
+ifeq ($(BR2_PACKAGE_KNOCK_KNOCKD),y)
+KNOCK_DEPENDENCIES += libpcap
+KNOCK_CONF_OPTS += --enable-knockd
 ifeq ($(BR2_STATIC_LIBS),y)
-KNOCK_CONF_OPTS = LIBS="`$(STAGING_DIR)/usr/bin/pcap-config --static --additional-libs`"
+KNOCK_CONF_OPTS += LIBS="`$(STAGING_DIR)/usr/bin/pcap-config --static --additional-libs`"
+endif
+else
+KNOCK_CONF_OPTS += --disable-knockd
 endif
 
 $(eval $(autotools-package))