Re: to register instance of UNICODE string

I am sorry I did not point that I changed ABC to DEF to make sure snmpget
returns the first character.

In case of ABC snmpget returns 'A', and in case of DEF - 'D'.

Below the output:

f560-2k1 snmp/mibs# snmpget -v2c -c rwpublic -d localhost
NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0

Sending 50 bytes to UDP: [0.0.0.0]->[127.0.0.1]:161
0000: 30 30 02 01 01 04 08 72 77 70 75 62 6C 69 63 A0 00.....rwpublic.
0016: 21 02 04 72 A5 EF 4F 02 01 00 02 01 00 30 13 30 !..r..O......0.0
0032: 11 06 0D 2B 06 01 04 01 BF 08 02 04 01 01 02 00 ...+............
0048: 05 00 ..


Received 66 bytes from UDP: [0.0.0.0]->[127.0.0.1]:161
0000: 30 40 02 01 01 04 08 72 77 70 75 62 6C 69 63 A2 [email protected].
0016: 31 02 04 72 A5 EF 4F 02 01 00 02 01 00 30 23 30 1..r..O......0#0
0032: 21 06 0D 2B 06 01 04 01 BF 08 02 04 01 01 02 00 !..+............
0048: 04 10 44 00 00 00 45 00 00 00 46 00 00 00 00 00 ..D...E...F.....
0064: 00 00 ..

NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 = STRING: D


2009/2/24 Dave Shield <[email protected]>

> 2009/2/24 Alexander Bubnov <[email protected]>:
> > I have corrected the code, below differences:
> >     static const wchar_t nstAgentSubagentObject[] = L"DEF"; <-- array
> > and
> >     sizeof(nstAgentSubagentObject), instead
> of wcslen(nstAgentSubagentObject),
> > run next commands:
> > # snmpget -v2c -c rwpublic -Ox localhost   nstAgentSubagentObject.0
> > NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0 = STRING: A
>
> Eh?
> The buffer holds "DEF", but the agent returns something starting "A".
> Something is seriously wrong there.
>
> >  I guess snmpget prints till zero terminator or agent sends till zero
> terminator,
>
> Don't guess - check.
> Run the command with the '-d' option to dump the raw packet.
> You should see the octets of the value being returned at the
> end of the packet dump.
>   (Unfortunately, it seems that the DISPLAY-HINTS clause in the MIB
> file takes precedence over the -Ox flag.  Sorry about that).
>
>
> I'd expect the agent to be returning the full value, because it typically
> works with strings as "length+data" rather than 0-terminated.
> (Remember, binary strings are handled by SNMP in exactly the same
> way as printable strings, and these might well include embedded NULs).
>
>
> My suspicion is that it's probably the client that's not printing the
> value correctly.   But looking at the raw dump should confirm or
> reject this.
>
>
> > Can you please point to what is wrong, now? Is it possible to see whole
> > string?
>
> It sounds as if we need someone more knowledgeable about
> internationalisation
> issues to look over the output processing, and suggest a more robust
> approach.
> Assuming that is indeed what is happening here.
>
> Dave
>



-- 
/BR, Alexander

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