subagent config file issue

Hello all,

My name is Ryan Dowell and I work on the SNMP agent for Fusion-io.  I have been experiencing some issues with using a configuration file for an agentx subagent.  I am finding that the separate configuration file for the subagent seems to never be read when the subagent is started.  The subagent initialization is based on the example at www.net-snmp.org/docs/man/snmp_agent_api.htm, and the .conf file name matches that of the subagent executable(i.e. 'xxx_agent' and 'xxx_agent.conf'), and is located in the /etc/snmp directory where the snmpd.conf and snmptrapd.conf files are located.  Inside the subagent code, I am attempting to initialize and read the .conf file as follows:

Int main{int argc, char *argv)
{
                ...
                Const char *agentName = basename(argv[0]);
                ...
Register_config_handler(agentName, token_XXX, configHandler, NULL, NULL);
Register_config_handler(agentName, token_YYY, configHandler, NULL, NULL);
...
Netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
...
Init_agent(agentName);
...
Init_snmp(agentName);
...
<main loop>
...
Snmp_shutdown(agentName);
}

Void configHandler(const char* token, char* value)
{
                If (strcmp(token, token_XXX) == 0)
                {
                                Config_XXX = ....
                }
                Else if (strcmp(token, token_YYY) = 0)
                {
                                Config_YYY = ...
                }
}

I have confirmed that the token names passed to register_config_handler and used in configHandler match those in the subagent's .conf file and that the .conf and executable share the same file name aside from the extension.  What I've found while debugging is that the configHandler function is never invoked, so none of the config parameters we expect to read from the file are ever read in, and they all keep their default values.  The subagent runs completely normally otherwise.  Running snmpconf shows that net-snmp is only aware of snmpd.conf and snmptrapd.conf.  I would like to know if perhaps there is an installation step we are missing to make sure net-snmp is aware of the subagent's .conf file, or if there is a more direct way to make it read the .conf file than the method of registering the callback and relying on init_agent and init_snmp to find and read the file.  Any insight or suggestions would be greatly appreciated, as I have not seen anything else in the documentation regarding use of a separate .conf file for a subagent.

Ryan Dowell

Software Engineer, Fusion-io
Superior, CO
[email protected]


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