utils/collectd: Re-add option to enable encrypted network output

The collectd network plugin has the ability to sign and/or encrypt its
traffic, allowing secure interaction with other collectd instances. This
had been disabled due to issues with the collectd build system.
Fix up the configure parameters to work correctly and re-add the option.

Signed-off-by: Jonathan McDowell <noodles@earth.li>

utils/collectd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=collectd
 PKG_VERSION:=5.8.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://collectd.org/files/ \
@@ -203,6 +203,14 @@ define Package/collectd/description
  and provides mechanismns to store the values in a variety of ways.
 endef
 
+define Package/collectd/config
+	config PACKAGE_COLLECTD_ENCRYPTED_NETWORK
+	bool "Enable ability to use encrypted networking"
+	default n
+	depends on PACKAGE_collectd
+	select PACKAGE_collectd-mod-network
+endef
+
 ifneq ($(CONFIG_avr32),)
   TARGET_CFLAGS += -fsigned-char
 endif
@@ -214,7 +222,6 @@ CONFIGURE_ARGS+= \
 	--enable-daemon \
 	--with-nan-emulation \
 	--with-libyajl=no \
-	--without-libgcrypt \
 	--without-perl-bindings \
 	--without-libudev
 
@@ -223,6 +230,16 @@ CONFIGURE_VARS+= \
 	LDFLAGS="$$$$LDFLAGS -lm -lz" \
 	KERNEL_DIR="$(LINUX_DIR)" \
 
+ifneq ($(CONFIG_PACKAGE_COLLECTD_ENCRYPTED_NETWORK),)
+CONFIGURE_ARGS+= \
+	--with-libgcrypt=$(STAGING_DIR)/usr
+CONFIGURE_VARS+= \
+	GCRYPT_LIBS="-lgcrypt"
+else
+CONFIGURE_ARGS+= \
+	--without-libgcrypt
+endif
+
 CONFIGURE_PLUGIN= \
 	$(foreach m, $(1), \
 		$(if $(CONFIG_PACKAGE_collectd-mod-$(subst _,-,$(m))),--enable-$(m),--disable-$(m)) \
@@ -353,7 +370,7 @@ $(eval $(call BuildPlugin,match-value,value match,match_value,))
 $(eval $(call BuildPlugin,memory,physical memory usage input,memory,))
 $(eval $(call BuildPlugin,modbus,read variables through libmodbus,modbus,+PACKAGE_collectd-mod-modbus:libmodbus))
 $(eval $(call BuildPlugin,netlink,netlink input,netlink,+PACKAGE_collectd-mod-netlink:libmnl))
-$(eval $(call BuildPlugin,network,network input/output,network,))
+$(eval $(call BuildPlugin,network,network input/output,network,+PACKAGE_COLLECTD_ENCRYPTED_NETWORK:libgcrypt))
 $(eval $(call BuildPlugin,nginx,nginx status input,nginx,+PACKAGE_collectd-mod-nginx:libcurl))
 $(eval $(call BuildPlugin,ntpd,NTP daemon status input,ntpd,))
 $(eval $(call BuildPlugin,nut,UPS monitoring input,nut,+PACKAGE_collectd-mod-nut:nut-common))