vp->magic and OID passed by snmpd

#1 (**permalink**) 06-21-2007

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Greetings to all.

I am using the code generated by mib2c for my MIB file. It contains an array
like this.. :

*oid systemInfo_variables_oid[] = { 1, 3, 6, 1, 4, 1, 6305, 1, 10, 1, 2, 1
};*
*struct variable7 systemInfo_variables[] = {*
*.*
*.*
*.*
*/* Out of all the elements of array, one is below, pasting only relevant
code here */*

*#define OVERALLDISKOCCUPANCYINKB 276*

* {OVERALLDISKOCCUPANCYINKB, ASN_UNSIGNED, RONLY,
var_systemDiskStatsNotfyAttrTable, 4, {2, 18, 1, 1}},*

*.*

*.*

*.*

*}*

When I fire a snmpget for OID 1.3.6.1.4.1.6305.1.10.1.2.1.2.18.1.1.1, I get
an error like this:

RFC1155-SMI::enterprises.6305.1.10.1.2.1.2.18.1.2.1 = No Such Instance
currently exists at this OID

In my function, when I print OID and vp->magic, OID passed is correct
whereas vp->magic is not 276 and hence the relevant case for the switch
statement is not hit. snmpd calls var_systemDiskStatsNotfyAttrTable with
incorrect vp->magic. Any anyone give me some pointers on this... I have
copied the relevant code below:

*/*
* var_systemDiskStatsNotfyAttrTable():
* Handle this table separately from the scalar value case.
* The workings of this are basically the same as for var_systemInfo
above.
*/
unsigned char *
var_systemDiskStatsNotfyAttrTable (struct variable *vp,
oid * name,
size_t * length,
int exact,
size_t * var_len,
WriteMethod ** write_method)
{
..*

*.*

*switch (vp->magic)
{
case OVERALLDISKOCCUPANCYINKB:
VAR = (int*)&p_resp->overall_disk_occupancy; /* XXX **

* default:*

* ERROR_MSG(" ");*

* }*

*.*

*.*

*}*

Thanks a lot in advance for your help.

Shivani

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<div>Greetings to all.</div>
<div> </div>
<div>I am using the code generated by mib2c for my MIB file. It contains an array like this.. :</div>
<div>
oid systemInfo_variables_oid[] = { 1, 3, 6, 1, 4, 1, 6305, 1, 10, 1, 2, 1 };</div>
<div>struct variable7 systemInfo_variables[] = {</div>
<div>.</div>
<div>.</div>
<div>.</div>
<div>/* Out of all the elements of array, one is below, pasting only relevant code here */</div>
<div>
#define OVERALLDISKOCCUPANCYINKB  276
    {OVERALLDISKOCCUPANCYINKB, ASN_UNSIGNED, RONLY,    var_systemDiskStatsNotfyAttrTable, 4, {2, 18, 1, 1}},
.
.
.
}
 
When I fire a snmpget for OID 1.3.6.1.4.1.6305.1.10.1.2.1.2.18.1.1.1, I get an error like this:
RFC1155-SMI::enterprises.6305.1.10.1.2.1.2.18.1.2.1 = No Such Instance currently exists at this OID
In my function, when I print OID and vp->magic, OID passed is correct whereas vp->magic is not 276 and hence the relevant case for the switch statement is not hit. snmpd calls var_systemDiskStatsNotfyAttrTable with incorrect vp->magic. Any anyone give me some pointers on this... I have copied the relevant code below:

/*  * var_systemDiskStatsNotfyAttrTable():  *&nb sp;  Handle this table separately from the scalar value case.  *   The workings of this are basically the same as for var_systemInfo above.  */ unsigned char *
 var_systemDiskStatsNotfyAttrTable (struct variable *vp,        oid * name,        size_t * length,        int exact,        size_t * var_len,        WriteMethod ** write_method) { .
.
switch (vp->magic)      {      case OVERALLDISKOCCUPANCYINKB:    &nb sp;      VAR = (int*)&p_resp->overall_disk_occupancy; /* XXX *
     default:
      &nb sp; ERROR_MSG(" ");
      }
.
.
}
Thanks a lot in advance for your help.
Shivani</div>

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