On 20/09/06, Leo Lei <[EMAIL PROTECTED]> wrote:
> are there any example illustrating the usage of the view OID mask? i have
> read the part of
> view directive in the snmpd.conf(5)
> and the vacmViewTreeFamilyMask definition in VACM rfc, but i can't understand
> it. thanks.
The latest version of the source (currently available as 5.4.pre1) has
a re-written snmpd.conf(5) description of the view token, to expand on
the role of the MASK field.
This now reads as follows:
view VNAME TYPE OID [MASK]
defines a named "view" - a subset of the overall OID tree. This
is most commonly a single subtree, but several view directives
can be given with the same view name, to build up a more complex
collection of OIDs. TYPE is either included or excluded, which
can again define a more complex view (e.g by excluding certain
sensitive objects from an otherwise accessible subtree).
MASK is a list of hex octets (optionally separated by '.' or
':') with the set bits indicating which subidentifiers in the
view OID to match against. If not specified, this defaults to
matching the OID exactly (all bits set), thus defining a simple
OID subtree. So:
view iso1 included .iso 0xf0
view iso2 included .iso
view iso3 included .iso.org.dod.mgmt 0xf0
would all define the same view, covering the whole of the
'iso(1)' subtree (with the third example ignoring the subidenti-
fiers not covered by the mask).
More usefully, the mask can be used to define a view covering a
particular row (or rows) in a table, by matching against the
appropriate table index value, but skipping the column subiden-
tifier:
view ifRow4 included .1.3.6.1.2.1.2.2.1.0.4 0xff:a0
Note that a mask longer than 8 bits must use ':' to separate the
individual octets.
Is that any more helpful?
Dave
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