Hi All,
Thanks sir for such detail answer, i tried to followed your instructions, so
i decided to make it simple, mean i started some exercise to understand
template code. I changed my earlier MIB and made it simpler for me , First
of all i am trying to define a string object in MIB file for READ only.
my MIB file for this purpose is. and i hve object teststr, just want to
apply GET request on agent.
--------------------------------------------------------------
MIB name is TEST-MIB.txt
TEST-ENTERPRISE-MIB DEFINITIONS ::= BEGIN
IMPORTS
enterprises
FROM RFC1155-SMI
MODULE-IDENTITY, OBJECT-TYPE, NOTIFICATION-TYPE,
TimeTicks, Counter32, snmpModules, mib-2
FROM SNMPv2-SMI
DisplayString, TestAndIncr, TimeStamp
FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP, NOTIFICATION-GROUP
FROM SNMPv2-CONF;
-- iso(1).org(3).dod(6).internet(1)
-- |
-- private(4)
-- |
-- enterprises(1)
-- |
-- test(100)
-- |
-- ._______________.________________.
-- | |
-- system(1)
--
--
test OBJECT IDENTIFIER ::= { enterprises 100 }
testsystem OBJECT IDENTIFIER ::= { test 1 }
teststr OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An administratively-assigned name for this managed
node. By convention, this is the node's fully-qualified
domain name. If the name is unknown, the value is
the zero-length string."
::= { testsystem 1 }
END
---------------------
then i run command "mib2c -c mib2c.scalar.conf teststr" in terminal and got
teststr.c and teststr.h files that i move to agent/mibgroups/teststr
directory.
i put following code in my teststr.c file.
----------------------------------------------------------
/*
* Note: this file originally auto-generated by mib2c using
* $
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "teststr.h"
/** Initializes the teststr module */
void
init_teststr(void)
{
const oid teststr_oid[] = { 1,3,6,1,4,1,100,1,1 };
DEBUGMSGTL(("teststr", "Initializing\n"));
netsnmp_register_scalar(
netsnmp_create_handler_registration("teststr", handle_teststr,
teststr_oid, OID_LENGTH(teststr_oid),
HANDLER_CAN_RONLY
));
}
int
handle_teststr(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
/* 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. */
*char *ptr = "test";*
switch(reqinfo->mode) {
case MODE_GET:
* snmp_set_var_typed_value(requests->requestvb,
ASN_OCTET_STR,ptr,strlen(ptr));*
* break;*
default:
/* we should never get here, so this is a really bad error */
snmp_log(LOG_ERR, "unknown mode (%d) in handle_teststr\n",
reqinfo->mode );
return SNMP_ERR_GENERR;
}
return SNMP_ERR_NOERROR;
}
------------------------------------------------------------------------------------------------
then i recompiled the source of net-snmp with mib modules
command. ./configure --with-mib-modules="teststr/teststr"
then I run make and make install commands and successfully compiled the
code.
--------------------------------------------
i performed following snmptranslate steps and got responses.
snmptranslate -IR TEST-MIB::teststr
MIB search path: /root/.snmp/mibs:/usr/local/share/snmp/mibs
Cannot find module (TEST-MIB): At line 0 in (none)
Unknown object identifier: TEST-MIB::teststr
but when i run "snmptranslate 1.3.6.1.4.1.100.1.1" i got following response
TEST-ENTERPRISE-MIB::teststr.
-------------------
snmptranslate -On TEST-ENTERPRISE-MIB::teststr
.1.3.6.1.4.1.100.1.1
----------------------------
snmptranslate -Of TEST-ENTERPRISE-MIB::teststr
.iso.org.dod.internet.private.enterprises.test.testsystem.teststr
---------------------------------------------------------------
snmptranslate -IR teststr
TEST-ENTERPRISE-MIB::teststr
-----------------------------------------
now i run snmpget command to get the value of teststr object but i got
following response
command : snmpget -v 1 -c public localhost teststr
Error
-------------
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: TEST-ENTERPRISE-MIB::teststr
-----------------------
Can some one guide me where i am wrong? Is there issue in my lines of code
or i made some mistake in MIB file.
Regards
On Thu, Aug 25, 2011 at 2:26 PM, Dave Shield <d.t.shi...@liverpool.ac.uk>wrote:
> On 25 August 2011 09:53, devel tech <devel.te...@gmail.com> wrote:
> > i compiled [my MIB] using mib2c command and it generated two files .c
> and h of
> > object Namesys.
> >
> > mib2c -c mib2c.scalar.conf Namesys
>
>
> > it was okay, then i run make command and i got following errors
> >
> > --------------------
> > test/Namesys.c: In function 'handle_Namesys':
> > test/Namesys.c:43: error: expected expression before ',' token
> > test/Namesys.c:63: error: expected expression before ')' token
> > test/Namesys.c:76: error: expected expression before ')' token
> > test/Namesys.c:83: error: expected expression before ')' token
> > test/Namesys.c:91: error: expected expression before ')' token
>
> It looks as if you haven't finished writing the code in the MIB template.
> Remember that the output of mib2c is the *starting* point for
> a MIB implementation. It's not finished code.
>
> From the FAQ entry
> Why doesn't my new MIB module report anything?
>
> Remember that 'mib2c' simply generates template code for your MIB module.
> It's up to you to fill in the details, to report the actual information
> from
> whatever underlying subsystem is being monitored. Mib2c cannot help with
> the semantics of the MIB module - it's purely there to provide an initial
> code framework, based on the _syntax_ of the MIB module objects.
>
>
>
> Note that word "template".
>
>
>
>
> > I tried to fix above error but i could not. below i pasted mentioned
> lines
> > of errror.
> >
> > line 43 of Namesys.c is switch(reqinfo->mode) {
> >
> > case MODE_GET:
> > snmp_set_var_typed_value(requests->requestvb, ASN_OCTET_STR,
> > /* XXX: a pointer to the scalar's
> data */,
> > /* XXX: the length of the data in
> bytes */);
> > break;
>
>
> You have two comments there, indicating the places where you need to
> provide suitable code. You need to declare a variable that contains the
> value to be reported, and this goes into the first gap.
> The size of this value (typically using 'strlen' for a printable string,
> or 'sizeof' for a fixed buffer binary string) is provided as the final
> parameter.
>
> Just as the comments tell you.
>
>
>
> > lines no. 63..-65
> > 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);
> > }
>
> Again, this block is asking you to provide whatever code
> is necessary to store a temporary copy of the new (or old) value,
> so that the assignment can be reversed if necessary.
>
>
> I will repeat my advice that I *strongly* suggest you spend
> some time getting used to how the agent works before you
> try to develop your own MIB.
> Both in terms of simply using the agent, to see how it behaves.
> And also looking at the existing MIB code, to see how that works.
>
> There are plenty of examples of scalar objects in the standard tree.
> Please look at those, and try to understand how they have been
> implemented. That will stand you in good stead when you
> finally come to write your own MIB code.
>
> Dave
>
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