zabbix: Add optional SNMP support for all server/proxy variants

- Add CONFIG_ZABBIX_SNMP menuconfig option to enable SNMP support
- Support all zabbix-server and zabbix-proxy variants (nossl, openssl, gnutls)
- Add conditional libnetsnmp dependency based on SNMP config
- Add --with-net-snmp configure option when SNMP is enabled
- Include patch to fix NetSNMP strong auth detection issue

This allows users to optionally enable SNMP support for Zabbix server
and proxy components through menuconfig, with proper dependency
management and build configuration.

Signed-off-by: Martin Liu <[email protected]>

Author: mlzy

admin/zabbix/Makefile

@@ -27,7 +27,8 @@ PKG_BUILD_PARALLEL:=1
 PKG_CONFIG_DEPENDS:= \
   CONFIG_ZABBIX_MYSQL \
   CONFIG_ZABBIX_POSTGRESQL \
-  CONFIG_ZABBIX_SQLITE
+  CONFIG_ZABBIX_SQLITE \
+  CONFIG_ZABBIX_SNMP
 
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/nls.mk
@@ -48,6 +49,14 @@ choice
         config ZABBIX_SQLITE
                 bool "SQLite"
 endchoice
+
+config ZABBIX_SNMP
+        bool "Enable SNMP support"
+        depends on PACKAGE_zabbix-server || PACKAGE_zabbix-server-openssl || PACKAGE_zabbix-server-gnutls || PACKAGE_zabbix-proxy || PACKAGE_zabbix-proxy-openssl || PACKAGE_zabbix-proxy-gnutls
+        default n
+        help
+          Enable SNMP support for Zabbix server and proxy.
+          This requires libnetsnmp package.
 endef
 
 define Package/zabbix/Default
@@ -166,6 +175,7 @@ endef
 define Package/zabbix-server
   $(call Package/zabbix-server/Default)
   PROVIDES:=zabbix-server
+  DEPENDS+= +ZABBIX_SNMP:libnetsnmp
   VARIANT:=nossl
   DEFAULT_VARIANT:=1
 endef
@@ -174,15 +184,15 @@ define Package/zabbix-server-openssl
   $(call Package/zabbix-server/Default)
   TITLE+= (with OpenSSL)
   PROVIDES:=zabbix-server
-  DEPENDS+= +libopenssl
+  DEPENDS+= +libopenssl +ZABBIX_SNMP:libnetsnmp
   VARIANT:=openssl
 endef
 
 define Package/zabbix-server-gnutls
   $(call Package/zabbix-server/Default)
   TITLE+= (with GnuTLS)
   PROVIDES:=zabbix-server
-  DEPENDS+= +libgnutls
+  DEPENDS+= +libgnutls +ZABBIX_SNMP:libnetsnmp
   VARIANT:=gnutls
 endef
 
@@ -220,6 +230,7 @@ endef
 define Package/zabbix-proxy
   $(call Package/zabbix-proxy/Default)
   PROVIDES:=zabbix-proxy
+  DEPENDS+= +ZABBIX_SNMP:libnetsnmp
   VARIANT:=nossl
   DEFAULT_VARIANT:=1
 endef
@@ -228,15 +239,15 @@ define Package/zabbix-proxy-openssl
   $(call Package/zabbix-proxy/Default)
   TITLE+= (with OpenSSL)
   PROVIDES:=zabbix-proxy
-  DEPENDS+= +libopenssl
+  DEPENDS+= +libopenssl +ZABBIX_SNMP:libnetsnmp
   VARIANT:=openssl
 endef
 
 define Package/zabbix-proxy-gnutls
   $(call Package/zabbix-proxy/Default)
   TITLE+= (with GnuTLS)
   PROVIDES:=zabbix-proxy
-  DEPENDS+= +libgnutls
+  DEPENDS+= +libgnutls +ZABBIX_SNMP:libnetsnmp
   VARIANT:=gnutls
 endef
 
@@ -267,6 +278,7 @@ CONFIGURE_ARGS+= \
 	$(if $(CONFIG_ZABBIX_MYSQL),--with-mysql) \
 	$(if $(CONFIG_ZABBIX_POSTGRESQL),--with-postgresql) \
 	$(if $(CONFIG_ZABBIX_SQLITE),--with-sqlite3=$(STAGING_DIR)/usr) \
+	$(if $(CONFIG_ZABBIX_SNMP),--with-net-snmp) \
 	--with-libevent=$(STAGING_DIR)/usr/include \
 	--with-libpcre2=$(STAGING_DIR)/usr/include \
 	--with-zlib=$(STAGING_DIR)/usr/include

admin/zabbix/patches/120-fix-netsnmp-strong-auth-detection.patch

@@ -0,0 +1,11 @@
+--- a/m4/netsnmp.m4
++++ b/m4/netsnmp.m4
+@@ -168,6 +168,7 @@ AC_DEFUN([LIBNETSNMP_CHECK_CONFIG],[
+ 		]], [[
+ struct snmp_session session;
+ session.securityAuthProto = usmHMAC384SHA512AuthProtocol;
++return (int)(long)session.securityAuthProto;
+ 		]])],[
+ 		AC_DEFINE(HAVE_NETSNMP_STRONG_AUTH, 1, [Define to 1 if strong SHA auth protocols are supported.])
+ 		AC_MSG_RESULT(yes)
+