snmp library: first trivial code base, not even building

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

snmp library: first trivial code base, not even building
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
9228a7ff · Alessandro Rubini · 481c69d3 · 9228a7ff · 9228a7ff · 9228a7ff
Commit 9228a7ff authored Jun 24, 2014 by Alessandro Rubini
6 changed files
--- a/userspace/snmpd/.gitignore
+++ b/userspace/snmpd/.gitignore
+.index
--- a/userspace/snmpd/Makefile
+++ b/userspace/snmpd/Makefile
+
+SNMP_BUILD := $(wildcard $(WRS_OUTPUT_DIR)/build/buildroot-2*)
+SNMP_BUILD := $(wildcard $(SNMP_BUILD)/output/build/netsnmp-*)
+
+NET_SNMP_CONFIG = $(SNMP_BUILD)/net-snmp-config
+
+CC      = $(CROSS_COMPILE)gcc
+LD	= $(CROSS_COMPILE)ld
+
+# defer running "net-snmp-config --cflags" so it is visible in make output
+CFLAGS  = -fPIC   $$($(NET_SNMP_CONFIG) --cflags)
+LDFLAGS = -shared $$($(NET_SNMP_CONFIG) --ldflags)
+
+SHLIB = wrsSnmp.so
+SOURCES = wrsPstats.c
+OBJECTS = $(SOURCES:.c=.o)
+
+all: $(SHLIB)
+
+$(SHLIB): $(OBJECTS)
+	$(CC) $(LDFLAGS) $^ -o $@
+
+clean:
+	rm -f $(SHLIB) $(OBJECTS)
+
+install:
+	install -d  $(WR_INSTALL_ROOT)/lib
+	install *.so $(WR_INSTALL_ROOT)/lib
--- a/userspace/snmpd/README
+++ b/userspace/snmpd/README
+
+The initial version of wrsPstats.c and wrsPstats.h is generated by running
+
+  export BUILD_DIR="$WRS_OUTPUT_DIR/build/buildroot-2011.11/output/build"
+  export MIBDIRS=$BUILD_DIR/netsnmp-5.6.1.1/mibs
+
+And then this "intuitive" command:
+
+   export MIBS=./WR-SWITCH-MIB.txt
+   $BUILD_DIR/netsnmp-5.6.1.1/local/mib2c \
+          -I $BUILD_DIR//netsnmp-5.6.1.1/local \
+          -c mib2c.scalar.conf \
+          wrsPstats
+
--- a/userspace/snmpd/WR-SWITCH-MIB.txt
+++ b/userspace/snmpd/WR-SWITCH-MIB.txt
+WR-SWITCH-MIB DEFINITIONS ::= BEGIN
+
+-- This is blatantly copied from  NET-SNMP-TUTORIAL-MIB.txt and adapted
+-- URL: http://www.net-snmp.org/tutorial/tutorial-5/
+--                            toolkit/mib_module/NET-SNMP-TUTORIAL-MIB.txt
+-- Bugs and swearing by Alessandro Rubini
+
+-- IMPORTS: Include definitions from other mibs here
+IMPORTS
+	OBJECT-TYPE, Integer32,
+	MODULE-IDENTITY,enterprises           FROM SNMPv2-SMI
+	MODULE-COMPLIANCE, OBJECT-GROUP       FROM SNMPv2-CONF;
+
+CERN OBJECT IDENTIFIER ::= { enterprises 96 }
+
+-- A brief description and update information about this mib.
+-- (I follow the CamelCase to be sure I don't mysype. Who knows the rules...
+
+wrSwitchMIB MODULE-IDENTITY
+    LAST-UPDATED "201406181915Z"    -- 18 june 2014, 19:15 (why saying again?)
+    ORGANIZATION "CERN"
+    CONTACT-INFO "postal:   BE-CO-HT, CERN, Geneva
+		  email:    ht-drivers@cern.ch
+                 "
+    DESCRIPTION  "White Rabbit Switch internal details
+                 "
+    ::= { CERN 100 }
+
+-- Define typical mib nodes
+-- we'll prefix everything in this mib with wrs (White Rabbit Switch)
+wrsPstats     OBJECT IDENTIFIER ::= { wrSwitchMIB 1 }
+wrsPpsi       OBJECT IDENTIFIER ::= { wrSwitchMIB 2 }
+
+-- define 1 stupid object for a start
+
+wrsPstatsOne   OBJECT-TYPE
+    SYNTAX      Integer32
+    MAX-ACCESS  read-write
+    STATUS      current
+    DESCRIPTION
+        "Just an integer"
+    DEFVAL { 666 }
+    ::= { wrsPstats 1 }
+
+END
--- a/userspace/snmpd/wrsPstats.c
+++ b/userspace/snmpd/wrsPstats.c
+/*
+ * Note: this file originally auto-generated by mib2c using
+ *        : mib2c.scalar.conf 17798 2009-10-27 06:44:54Z magfr $
+ */
+
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+#include <net-snmp/agent/net-snmp-agent-includes.h>
+#include "wrsPstats.h"
+
+/** Initializes the wrsPstats module */
+void
+init_wrsPstats(void)
+{
+    const oid       wrsPstatsOne_oid[] =
+        { 1, 3, 6, 1, 4, 1, 96, 100, 1, 1 };
+
+    DEBUGMSGTL(("wrsPstats", "Initializing\n"));
+
+    netsnmp_register_scalar(netsnmp_create_handler_registration
+                            ("wrsPstatsOne", handle_wrsPstatsOne,
+                             wrsPstatsOne_oid,
+                             OID_LENGTH(wrsPstatsOne_oid),
+                             HANDLER_CAN_RWRITE));
+}
+
+int
+handle_wrsPstatsOne(netsnmp_mib_handler *handler,
+                    netsnmp_handler_registration *reginfo,
+                    netsnmp_agent_request_info *reqinfo,
+                    netsnmp_request_info *requests)
+{
+    int             ret;
+    /*
+     * We are never called for a GETNEXT if it's registered as a
+     * "instance", as it's "magically" handled for us.  
+     */
+
+    /*
+     * a instance handler also only hands us one request at a time, so
+     * we don't need to loop over a list of requests; we'll only get one. 
+     */
+
+    switch (reqinfo->mode) {
+
+    case MODE_GET:
+        snmp_set_var_typed_value(requests->requestvb, ASN_INTEGER,
+                                 /*
+                                  * XXX: a pointer to the scalar's data 
+                                  */ ,
+                                 /*
+                                  * XXX: the length of the data in bytes 
+                                  */ );
+        break;
+
+        /*
+         * SET REQUEST
+         *
+         * multiple states in the transaction.  See:
+         * http://www.net-snmp.org/tutorial-5/toolkit/mib_module/set-actions.jpg
+         */
+    case MODE_SET_RESERVE1:
+        /*
+         * or you could use netsnmp_check_vb_type_and_size instead 
+         */
+        ret = netsnmp_check_vb_type(requests->requestvb, ASN_INTEGER);
+        if (ret != SNMP_ERR_NOERROR) {
+            netsnmp_set_request_error(reqinfo, requests, ret);
+        }
+        break;
+
+    case MODE_SET_RESERVE2:
+        /*
+         * XXX malloc "undo" storage buffer 
+         */
+        if ( /* XXX if malloc, or whatever, failed: */ ) {
+            netsnmp_set_request_error(reqinfo, requests,
+                                      SNMP_ERR_RESOURCEUNAVAILABLE);
+        }
+        break;
+
+    case MODE_SET_FREE:
+        /*
+         * XXX: free resources allocated in RESERVE1 and/or
+         * RESERVE2.  Something failed somewhere, and the states
+         * below won't be called. 
+         */
+        break;
+
+    case MODE_SET_ACTION:
+        /*
+         * XXX: perform the value change here 
+         */
+        if ( /* XXX: error? */ ) {
+            netsnmp_set_request_error(reqinfo, requests, /* some error */
+                                      );
+        }
+        break;
+
+    case MODE_SET_COMMIT:
+        /*
+         * XXX: delete temporary storage 
+         */
+        if ( /* XXX: error? */ ) {
+            /*
+             * try _really_really_ hard to never get to this point 
+             */
+            netsnmp_set_request_error(reqinfo, requests,
+                                      SNMP_ERR_COMMITFAILED);
+        }
+        break;
+
+    case MODE_SET_UNDO:
+        /*
+         * XXX: UNDO and return to previous value for the object 
+         */
+        if ( /* XXX: error? */ ) {
+            /*
+             * try _really_really_ hard to never get to this point 
+             */
+            netsnmp_set_request_error(reqinfo, requests,
+                                      SNMP_ERR_UNDOFAILED);
+        }
+        break;
+
+    default:
+        /*
+         * we should never get here, so this is a really bad error 
+         */
+        snmp_log(LOG_ERR, "unknown mode (%d) in handle_wrsPstatsOne\n",
+                 reqinfo->mode);
+        return SNMP_ERR_GENERR;
+    }
+
+    return SNMP_ERR_NOERROR;
+}
--- a/userspace/snmpd/wrsPstats.h
+++ b/userspace/snmpd/wrsPstats.h
+/*
+ * Note: this file originally auto-generated by mib2c using
+ *        : mib2c.scalar.conf 17798 2009-10-27 06:44:54Z magfr $
+ */
+#ifndef WRSPSTATS_H
+#define WRSPSTATS_H
+
+/*
+ * function declarations 
+ */
+void            init_wrsPstats(void);
+Netsnmp_Node_Handler handle_wrsPstatsOne;
+
+#endif                          /* WRSPSTATS_H */