net: mini_snmpd: Support more than 8 ports

The implementation of mini_snmpd is based on a number of fixed size arrays
for simplicity and efficiency.  This limits the number of ports which can
be monitored.  The default is as low as 8, which makes the package
unsuitable for many switches.

Make the size of these arrays a build time configuration add some package
variants for switches or other devices with more than 8 ports

Signed-off-by: Bjørn Mork <bjorn@mork.no>

net/mini_snmpd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mini_snmpd
 PKG_VERSION:=1.6
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 PKG_MAINTAINER:=Marcin Jurkowski <marcin1j@gmail.com>
 PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=COPYING
@@ -17,7 +17,7 @@ PKG_CPE_ID:=cpe:/a:minisnmpd_project:minisnmpd
 
 PKG_SOURCE:=mini-snmpd-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/troglobit/mini-snmpd/tar.gz/v$(PKG_VERSION)?
-PKG_BUILD_DIR:=$(BUILD_DIR)/mini-snmpd-$(PKG_VERSION)
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/mini-snmpd-$(PKG_VERSION)
 PKG_HASH:=de00c475a3c70c56f3ee97cd683cb71009d3521d60b1f589c5a91b4671ede9f3
 
 PKG_FIXUP:=autoreconf
@@ -40,6 +40,24 @@ define Package/mini_snmpd
 # openwrt requires init script runtime dependencies be defined for make menuconfig
 # (e.g busybox sysntpd)
   DEPENDS:=+jsonfilter +ubus +procd +ubox
+  VARIANT:=default
+  CONFLICTS:=mini_snmpd-16 mini_snmpd-52
+endef
+
+define Package/mini_snmpd-16
+  $(call Package/mini_snmpd)
+  TITLE+= (16 ports)
+  PROVIDES:=mini_snmpd
+  VARIANT:=16
+  CONFLICTS:=mini_snmpd-52
+endef
+
+define Package/mini_snmpd-52
+  $(call Package/mini_snmpd)
+  TITLE+= (52 ports)
+  PROVIDES:=mini_snmpd
+  VARIANT:=52
+  CONFLICTS:=
 endef
 
 CONFIGURE_ARGS+= \
@@ -49,6 +67,10 @@ CONFIGURE_ARGS+= \
 #     --disable-debug \
 #	--disable-demo - Upstream Github Issue #4 Fixed 20160707
 
+ifneq ($(BUILD_VARIANT),default)
+	CONFIGURE_ARGS += --with-interfaces=$(BUILD_VARIANT)
+endif
+
 define Package/mini_snmpd/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(CP) $(PKG_INSTALL_DIR)/usr/sbin/mini-snmpd $(1)/usr/sbin
@@ -58,8 +80,16 @@ define Package/mini_snmpd/install
 	$(INSTALL_BIN) ./files/mini_snmpd.init $(1)/etc/init.d/mini_snmpd
 endef
 
+Package/mini_snmpd-16/install=$(Package/mini_snmpd/install)
+Package/mini_snmpd-52/install=$(Package/mini_snmpd/install)
+
 define Package/mini_snmpd/conffiles
 /etc/config/mini_snmpd
 endef
 
+Package/mini_snmpd-16/conffiles=$(Package/mini_snmpd/conffiles)
+Package/mini_snmpd-52/conffiles=$(Package/mini_snmpd/conffiles)
+
 $(eval $(call BuildPackage,mini_snmpd))
+$(eval $(call BuildPackage,mini_snmpd-16))
+$(eval $(call BuildPackage,mini_snmpd-52))

net/mini_snmpd/patches/0001-make-MAX_NR_INTERFACES-configurable.patch

@@ -0,0 +1,70 @@
+From 60e685bd74bca45a4be9528d97f5a2edcc954e7f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <bjorn@mork.no>
+Date: Thu, 22 Sep 2022 11:49:42 +0200
+Subject: [PATCH] make MAX_NR_INTERFACES configurable
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: Bjørn Mork <bjorn@mork.no>
+---
+ configure.ac | 9 +++++++++
+ mini-snmpd.h | 1 -
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -40,6 +40,10 @@ AC_ARG_WITH(systemd,
+      [AS_HELP_STRING([--with-systemd=DIR], [Directory for systemd service files])],,
+      [with_systemd=auto])
+ 
++AC_ARG_WITH(interfaces,
++   AS_HELP_STRING([--with-interfaces=NUM], [Support NUM interfaces, default: 8]),
++	[with_interfaces=$withval], [with_interfaces="8"])
++
+ AC_ARG_ENABLE(debug,
+    AS_HELP_STRING([--enable-debug], [Enable developer debug mode, disabled by default]),
+    	[enable_debug=$enableval], [enable_debug=no])
+@@ -52,6 +56,7 @@ AC_ARG_ENABLE(ipv6,
+    AS_HELP_STRING([--disable-ipv6], [Disable IPv6 support, enabled by default]),
+    	[enable_ipv6=$enableval], [enable_ipv6=yes])
+ 
++
+ ### Enable features ###########################################################################
+ AS_IF([test "x$with_vendor" != "xno"],[
+ 	AS_IF([test "x$vendor" = "xyes"],[
+@@ -65,6 +70,8 @@ AS_IF([test "x$with_config" != "xno"], [
+ 	PKG_CHECK_MODULES([confuse], [libconfuse >= 2.7])])
+ AM_CONDITIONAL([HAVE_CONFUSE], [test "x$with_config" != "xno"])
+ 
++AC_DEFINE_UNQUOTED(MAX_NR_INTERFACES, $with_interfaces, [Max Number of Interfaces])
++
+ AS_IF([test "x$enable_debug" = "xyes"],[
+    AC_DEFINE(DEBUG, 1, [Define to enable debug mode.])])
+ 
+@@ -74,6 +81,7 @@ AS_IF([test "x$enable_demo" = "xyes"],[
+ AS_IF([test "x$enable_ipv6" != "xno"],[
+    AC_DEFINE(CONFIG_ENABLE_IPV6, 1, [Define to enable IPv6 support.])])
+ 
++
+ # Check where to install the systemd .service file
+ AS_IF([test "x$with_systemd" = "xyes" -o "x$with_systemd" = "xauto"], [
+      def_systemd=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)
+@@ -122,6 +130,7 @@ cat <<EOF
+   vendor OID........: $vendor
+   ipv6..............: $enable_ipv6
+   mini-snmpd.conf...: $with_config
++  max interfaces....: $with_interfaces
+   demo mode.........: $enable_demo
+   systemd...........: $with_systemd
+ 
+--- a/mini-snmpd.h
++++ b/mini-snmpd.h
+@@ -38,7 +38,6 @@
+ #define MAX_NR_OIDS                                     20
+ #define MAX_NR_SUBIDS                                   20
+ #define MAX_NR_DISKS                                    4
+-#define MAX_NR_INTERFACES                               8
+ #define MAX_NR_VALUES                                   2048
+ 
+ #define MAX_PACKET_SIZE                                 2048