Re: LEAF MIB

On 8 Apr 2008 06:24:13 -0000, <[email protected]> wrote:
>  i gave command
>
>  snmpget -v 2c -c public localhost leaf.leafNetwork.leafNetworkHostsIp.0

There's no point in doing this until you've actually finished coding the
'leaf.c' file.   SNMP isn't magic, and doesn't know what values to return.
*You* have got to tell the agent how to report the information that you're
interested in.


>  and my leaf.c leaf mib look like
>
>  LEAF-MIB DEFINITIONS ::= BEGIN
>  IMPORTS
>          mgmt, experimental, NetworkAddress, IpAddress, Counter, Gauge,
>                  TimeTicks
>              FROM RFC1155-SMI
>          OBJECT-TYPE
>                  FROM RFC-1212;

You should really be writing MIBs in SMIv2.
This old-style of MIB has been effectively obsolete for almost a decade now.


>  leaf     OBJECT IDENTIFIER ::= { iso org(3) dod(6) internet(1) experimental(3) 100 }

This area is really intended for use by IETF working groups, not private
individuals.   If you want a temporary location for your MIB, I'd suggest
you use NET-SNMP-MIB::netSnmpPlaypen  (1.3.6.1.4.1.8072.9999.9999)


Taking the object above  as an example:

> leafNetworkHostsIP OBJECT-TYPE
>     SYNTAX  IpAddress
>     ACCESS  read-write
>     STATUS  mandatory
>     DESCRIPTION
>      "/etc/hosts"
>     ::= { leafNetwork 3 }

   [snip]

>
>  (WE DONT KNOW WHAT EXACTLY WE SHOULD WRITE IN THIS .C FILE
>    PLEASE HELP US.)

What information do you want to return for the leafNetworkHosts.IP object?
Your DESCRIPTION just reads "/etc/hosts", which isn't very informative.



Try

>  int
>  handle_leafNetworkHostsIP(netsnmp_mib_handler *handler,
>                            netsnmp_handler_registration *reginfo,
>                            netsnmp_agent_request_info *reqinfo,
>                            netsnmp_request_info *requests)
>  {
>      int             ret;
        u_long     addr = 0x7f000001;
>
>      switch (reqinfo->mode) {
>      case MODE_GET:
>          snmp_set_var_typed_value(requests->requestvb, ASN_IPADDRESS,
                                    (u_char *) &addr,
                                    sizeof(addr));
>          break;

     /* To start with - implement as Read-Only */

>      case MODE_SET_RESERVE1:
>          netsnmp_set_request_error(reqinfo, requests, SNMP_ERR_NOTWRITABLE);
>          break;
>
>      case MODE_SET_FREE:
>          break;

>      default:
>          snmp_log(LOG_ERR,
>                   "unknown mode (%d) in handle_leafNetworkHostsIP\n",
>                   reqinfo->mode);
>          return SNMP_ERR_GENERR;
>      }
>
>      return SNMP_ERR_NOERROR;
>  }

(and similarly for the other functions).

That should at least allow you to get a working (read-only) agent.
Then start replacing the dummy values with real ones, retrieving
the necessary information from the appropriate place(s).

I wouldn't worry about SET support until you are comfortable with
the way that GET requests are handled.

Dave

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