[erlang-patches] SNMP/VACM: bugfix for vacmViewTreeFamilyMask

Stefan Zegenhagen <>
Wed Aug 1 11:30:19 CEST 2012

Dear all,

the implementation of SNMP-VIEW-BASED-ACM.mib assumes that the input for
vacmViewTreeFamilyMask is an OID consisting of 1's and 0's only to form
the mask. However, the MIB states that the input should be a bitstring.

The OID representation of the mask is useful in the code as it speeds up
time-critical code paths when checking access permissions for EACH SNMP
access. Reading/writing the view mask objects is less time-critical.

Therefore, to fix the issue, convert between OID representation and
bitstring when the vacmViewTreeFamilyMask objects are accessed. This is
done by the patch attached to this e-mail.

Kind regards,

Dr. Stefan Zegenhagen

arcutronix GmbH
Garbsener Landstr. 10
30419 Hannover

Tel:   +49 511 277-2734
Fax:   +49 511 277-2709
Web:   www.arcutronix.com

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