freeradius3: build and package support for LDAP

The lack of LDAP support was one of the things which prevented users
from migrating from freeradius2 to freeradius3.
Enable LDAP in freeradius3 so we can finally burry freeradius2.

Reported-by: Martin Mueller <mm@sig21.net>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/freeradius3/Makefile

@@ -282,7 +282,15 @@ define Package/freeradius3-mod-passwd/conffiles
 /etc/freeradius3/mods-enabled/passwd
 endef
 
-# LDAP support has not been ported
+define Package/freeradius3-mod-ldap
+  $(call Package/freeradius3/Default)
+  DEPENDS:=freeradius3 +libopenldap @FREERADIUS3_OPENSSL
+  TITLE:=LDAP Authentication
+endef
+
+define Package/freeradius3-mod-ldap/conffiles
+/etc/freeradius3/mods-available/ldap
+endef
 
 define Package/freeradius3-mod-logintime
   $(call Package/freeradius3/Default)
@@ -404,7 +412,6 @@ CONFIGURE_ARGS+= \
 	--without-rlm_idn \
 	--without-rlm_ippool \
 	--without-rlm_krb5 \
-	--without-rlm_ldap \
 	--without-rlm_opendirectory \
 	--without-rlm_pam \
 	--without-rlm_perl \
@@ -481,6 +488,14 @@ else
   CONFIGURE_ARGS+= --without-rlm_unix
 endif
 
+ifneq ($(SDK)$(CONFIG_PACKAGE_freeradius3-mod-ldap),)
+  CONFIGURE_ARGS+= --with-rlm_ldap \
+		--with-rlm_ldap-include-dir="$(STAGING_DIR)/usr/include" \
+		--with-rlm_ldap-lib-dir="$(STAGING_DIR)/usr/lib"
+else
+  CONFIGURE_ARGS+= --without-rlm_ldap
+endif
+
 CONFIGURE_VARS+= \
 	LDFLAGS="$$$$LDFLAGS" \
 	LIBS="$(CONFIGURE_LIBS)" \
@@ -595,6 +610,7 @@ $(eval $(call BuildPlugin,freeradius3-mod-exec,rlm_exec,))
 $(eval $(call BuildPlugin,freeradius3-mod-expiration,rlm_expiration,))
 $(eval $(call BuildPlugin,freeradius3-mod-expr,rlm_expr,))
 $(eval $(call BuildPlugin,freeradius3-mod-files,rlm_files,))
+$(eval $(call BuildPlugin,freeradius3-mod-ldap,rlm_ldap,))
 $(eval $(call BuildPlugin,freeradius3-mod-logintime,rlm_logintime,))
 $(eval $(call BuildPlugin,freeradius3-mod-mschap,rlm_mschap,))
 $(eval $(call BuildPlugin,freeradius3-mod-pap,rlm_pap,))