Hi,
Is there a way to track all function calls along with this
"-Ddumpv,dumph"?
I would like to track function calls made by 'snmpd' when I run snmpget to
query OIDs from other snmp abled device.
Thanks
Nishant
On Mon, 6 Sept 2021 at 19:26, Bill Fenner <fen...@gmail.com> wrote:
> On Sun, Sep 5, 2021 at 9:59 AM Nishant Nayan <nayan.nishant2...@gmail.com>
> wrote:
>
>> My aim is to know how various parameters like errorstat and errindex etc.
>> are set from response.
>>
>> For an example command :
>> snmpget -v1 -c cmty_remotehost1 localhost SNMPv2-MIB::sysName.1
>> SNMPv2-MIB::sysDescr.0 SNMPv2-MIB::sysObjectID.0
>>
>> SNMPv2-MIB::sysName.1 being an incorrect oid
>>
>
> I like to add "-Ddumpv,dumph" to get details of the messages that are
> being send and received. Try running your get with that debugging to see
> if the output helps you understand where each field comes from. (You can
> change it to just "-Ddump" to also get a hex dump, which you may be able to
> compare with the data field you see in your debugger).
>
> Each field in the packet is encoded using ASN.1, which is more or less a
> type/length/value encoding, but is fairly complex. If you're trying to
> create your own packets, please see if it's feasible to use an existing
> ASN.1 encoder, because there have historically been many bugs in ASN.1
> parsing and encoding so it's best to use a well-tested implementation.
>
> Also, if you want to know what the SNMP protocol is doing, as opposed to
> what the helpful snmpget command is doing, you should add "-Cf" to the
> snmpget command line - when snmpget gets an error like this, it'll strip
> out the bad object and try again so that it gets the data that may exist,
> but that is not how SNMP works per se - that is how snmpget works.
>
> Bill
>
>
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