python module for netsnmp

Discussion:

Andreea Bogdana Botez

2007-04-16 08:40:16 UTC

Hi.
I'm trying to use the python module for netsnmp with a new MIB (not one the
standard ones) and a new snmp agent that knows how to interact with it.
Standard tests work ok, for example:

snmpset -v 2c -c private 127.1:8333 SOME-MIB::<oid>.0 i 5
SOME-MIB::<oid>.0 = INTEGER: 5

Also, the standard snmp module tests (test.py) against snmpd with the given
conf file are ok.

But, when I try to do the same think using the python module:

sess = netsnmp.Session(Version=2, DestHost='localhost',
Community='public')
sess.UseEnums = 1
sess.UseLongNames = 1
vars = netsnmp.VarList(netsnmp.Varbind(<oid>,'0'))
vals = sess.get(vars)

I get an "get: unknown object ID (<oid>)v2 sess.get result: None" error.

If I change vars = netsnmp.VarList(netsnmp.Varbind(<numeric_oid>,'0')) -
then I get a None object in vals.

Probably there's something that I didn't do right..

I'm using net-snmp version 5.4 on a Linux RH 2.6.16.7 platform.

Thanks for helping
Bogdana

Dave Shield

2007-04-16 11:26:24 UTC

Permalink

Post by Andreea Bogdana Botez
sess = netsnmp.Session(Version=2, DestHost='localhost',
Community='public')
sess.UseEnums = 1
sess.UseLongNames = 1
vars = netsnmp.VarList(netsnmp.Varbind(<oid>,'0'))
vals = sess.get(vars)
I get an "get: unknown object ID (<oid>)v2 sess.get result: None" error.
If I change vars = netsnmp.VarList(netsnmp.Varbind(<numeric_oid>,'0')) -
then I get a None object in vals.

What happens if you try a "snmpget" request with the same numeric OID?
Does that return a value or not?

What happens if you try the python code with a "standard" OID?
Does that work or not?

Dave

Bogdana Botez

2007-04-16 12:44:06 UTC

Permalink

Hi Dave,

See my answers below.

Q: > What happens if you try a "snmpget" request with the same numeric OID?

Post by Dave Shield
Does that return a value or not?

A: I've just checked - it returns None:
In [15]: oid = netsnmp.Varbind(<numeric_OID_here>,'0')
In [19]: netsnmp.snmpget(oid, Version=2, RemotePort=8333,
Community="private")
Out[19]: (None,)

Q: > What happens if you try the python code with a "standard" OID?

Post by Dave Shield
Does that work or not?

A: This works - for example the script below works fine:
sess = netsnmp.Session(Version=2, DestHost='localhost',
Community='public')

sess.UseEnums = 1
sess.UseLongNames = 1

vars = netsnmp.VarList(netsnmp.Varbind('sysUpTime', 0),
netsnmp.Varbind('sysContact', 0),
netsnmp.Varbind('sysLocation', 0))
vals = sess.get(vars)

Post by Dave Shield

What happens if you try a "snmpget" request with the same numeric OID?
Does that return a value or not?
What happens if you try the python code with a "standard" OID?
Does that work or not?
Dave
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Dave Shield

2007-04-16 12:55:05 UTC

Permalink

Post by Bogdana Botez
Q: > What happens if you try a "snmpget" request with the same numeric OID?

Post by Dave Shield
Does that return a value or not?

In [15]: oid = netsnmp.Varbind(<numeric_OID_here>,'0')
In [19]: netsnmp.snmpget(oid, Version=2, RemotePort=8333,
Community="private")
Out[19]: (None,)

Sorry - that's not quite what I meant.
What happens if you try the "snmpget" *command-line*
tool with the same OID?

Dave

Bogdana Botez

2007-04-16 13:01:16 UTC

Permalink

You meant this: snmpget -v 2c -c private 127.1:8333
MY-MIB::<numeric_or_string_oid>.0

This works.

The command line tools all work with MY-MIB and the agent (snmpset,
snmpget. snmpwalk etc). I also use a MIB browser and I'm able to manage
it just fine. Only the python library seems to get blocked somewhere.

Bogdana

Post by Dave Shield

Post by Bogdana Botez
Q: > What happens if you try a "snmpget" request with the same numeric OID?

Post by Dave Shield
Does that return a value or not?

In [15]: oid = netsnmp.Varbind(<numeric_OID_here>,'0')
In [19]: netsnmp.snmpget(oid, Version=2, RemotePort=8333,
Community="private")
Out[19]: (None,)

Sorry - that's not quite what I meant.
What happens if you try the "snmpget" *command-line*
tool with the same OID?
Dave

Bogdana Botez

2007-04-17 14:09:16 UTC

Permalink

Well, I tried another python snmp module and it worked from the first try.
Still I don't know what was the problem with netsnmp, tough..

Post by Bogdana Botez
You meant this: snmpget -v 2c -c private 127.1:8333
MY-MIB::<numeric_or_string_oid>.0
This works.
The command line tools all work with MY-MIB and the agent (snmpset,
snmpget. snmpwalk etc). I also use a MIB browser and I'm able to manage
it just fine. Only the python library seems to get blocked somewhere.
Bogdana

Post by Dave Shield

Post by Bogdana Botez
Q: > What happens if you try a "snmpget" request with the same numeric OID?

Post by Dave Shield
Does that return a value or not?

In [15]: oid = netsnmp.Varbind(<numeric_OID_here>,'0')
In [19]: netsnmp.snmpget(oid, Version=2, RemotePort=8333,
Community="private")
Out[19]: (None,)

Sorry - that's not quite what I meant.
What happens if you try the "snmpget" *command-line*
tool with the same OID?
Dave

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Andreea Bogdana Botez

2007-04-16 12:46:32 UTC

Permalink

Hi Dave,

See my answers below.

Q: > What happens if you try a "snmpget" request with the same numeric OID?

Post by Dave Shield
Does that return a value or not?

A: I've just checked - it returns None:
In [15]: oid = netsnmp.Varbind(<numeric_OID_here>,'0')
In [19]: netsnmp.snmpget(oid, Version=2, RemotePort=8333, Community="private")
Out[19]: (None,)

Q: > What happens if you try the python code with a "standard" OID?

Post by Dave Shield
Does that work or not?

Post by Dave Shield

What happens if you try a "snmpget" request with the same numeric OID?
Does that return a value or not?
What happens if you try the python code with a "standard" OID?
Does that work or not?
Dave