snmpwalk doesn't show properly SNMP boolean values which equal false

[vvsosed]

We use definition like
leaf ifConnectorPresent { type boolean; description "This object has the value 'true(1)' if the interface sublayer has a physical connector and the value 'false(2)' otherwise."; smiv2:max-access "read-only"; smiv2:oid "1.3.6.1.2.1.31.1.1.1.17"; }

but unfortunately, we are able to see snmpwalk output like
IF-MIB::ifConnectorPresent.5 = INTEGER: true(1)
IF-MIB::ifConnectorPresent.7 = INTEGER: 0
According to RFC-1212 we should see
IF-MIB::ifConnectorPresent.5 = BOOLEAN: true(1)
IF-MIB::ifConnectorPresent.7 = BOOLEAN: false(2)
I suspect that problem happens because the CLIXON SNMP module uses integer type to support SNMP boolean value.

[olofhagsand]

There seems to be two problems,

• First that "false" is translated to INTEGER: 0, and should be INTEGERE: false(0)
• Second, that the type itself is not BOOLEAN.

This is a comment in the code regarding netsnmp support:

Athough smidump translates TruthValue to boolean
    * and there is an ASN_BOOLEAN constant:
    * 1) there is no code for ASN_BOOLEAN and
    * 2) Truthvalue actually translates to enum true(1)/false(0)

Would it be OK to fix the first false problem, since the second seems to be absent from the libnetsmp code available.
But I need to revisit that to be sure.

[shmuelhazan]

@olofhagsand I tested now with a some network equipment (Netgear swtich), and looks like they are representing it as an INTEGER too:

...
IF-MIB::ifConnectorPresent.939 = INTEGER: false(2)
...

So probably the main bug is that false is 0 instead of 2.

[vvsosed]

Successfully fixed, thanks!