subagent securityName

Hello,

I'm working on an net-snmp subagent to implement SNMP GET requests. In
my function to handle the SNMP request, I would like to be able to see
the SNMPv3 security name for the user that issued the request. So if I
run:
snmpget -v 3 -l authPriv -u tempUser [...] I would like to be able to
see that the get came from "tempUser" in my subagent.

I searched through the arguments in my handler function, and I found a
securityName field in both *reqinfo->asp->pdu and *reqinfo->asp->session
but the securityName in both locations is 0x0. In the session data the
contextName is not null but it is an empty string. 

If I do a -D ALL when I run snmpget I can see my user name in the log
statements so I know that net-snmp knows about it, but the information
is getting lost somewhere between net-snmp and my subagent.

Does anyone know the easiest way that I can get the securityName field
to have data? Do I need to do something special in the configuration
files other than creating the user to allow the securityName field in
the session data to be populated?

Thanks,
Dave Kurtzberg

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