Re: [Mibble-users] Transitive imports

[Per Cederberg]

As far as I understand, transitive imports are incorrect in ASN.1.
Which is the reason that Mibble reports them as an error.

The Mibble parser was originally written to be a strict, validating
parser. So that it can be used to check MIB files when authoring them.
But these days, I guess Mibble is more used for reading MIB files from
various sources. And the strict error checking is more of an
annoyance.

I guess this type of error should definitely become a warning instead.
I'll be sure to look into it more in detail next time I revise the
library. Meanwhile, you might try to adjust the code yourself (since
the source code is available). Check out the implementation of this
method in various classes (MibImport, MibContext, etc):

    public MibSymbol findSymbol(String name, boolean expanded);

Cheers,

/Per

2011/6/2 Marko Miettinen <address@hidden>:
> Hi,
>
> When using Mibble library, version 2.9.2, I've encountered following issue.
> When loading following MIB:
>
> http://www.mibsearch.com/mibview/CISCO-ADSL-DMT-LINE-MIB
>
> loading gives an error [1] because the MIB in question imports Unsigned32
> transitively through CISCO-TC MIB. Which in turn only imports it like:
>
> IMPORTS
>     MODULE-IDENTITY,
>     Gauge32,
>     Integer32,
>     Unsigned32,
>     Counter64
>         FROM SNMPv2-SMI
>
> So I have two questions related to this:
>
> Is this kind of transitive import legal? I have not found any evidence
> saying that it wasn't.
> Of course I can get rid of this by patching the problematic MIB to import
> Unsigned32 directly. But should Mibble be able to do handle transitive
> imports? E.g. ireasoning and MFSOFT MIB browsers are able to handle this
> scenario.
>
> There seems to be a bug opened for this:
> http://savannah.nongnu.org/bugs/?33443
>
> Thanks in advance for any answers,
>
> -Marko
>
>
> [1]: Error message: "couldn't find imported symbol 'Unsigned32' in MIB
> 'CISCO-TC'"
>
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