How To Implement Multiple Instance Modules

1. As root, stop the agent if the agent is already running.

   # svcadm disable -t svc:/application/management/sma:default

2. Set up an SNMPv3 user.

   For example, set up user name myuser with password mypassword as follows:

   # $ /usr/sfw/bin/net-snmp-config --create-snmpv3-user myuser Enter authentication pass-phrase: mypassword Enter encryption pass-phrase: [press return to reuse the authentication pass-phrase]

3. Edit the module to register context names that the module handles.

   Find the init_module routine in the module. Add code to register context names that the module handles.

   For example, you might add the following code:

   void 
   init_filesize(void) 
   { 
   // Declare the OID
   static oid filesize_oid[] = { 1,3,6,1,4,1,42,2,2,4,4,6,1,1,0 };
   
   
   // Declare a registration handler
   netsnmp_handler_registration *myreg1; 
   
   // Declare pointers to character arrays initialized
   // to the context name strings
   char *filexcon = "fileX"; 
   char *fileycon = "fileY"; 
   
   // Create a registration handler for the OID. 
   // filesize is the name of handler.
   // get_filesize is the function to call when an SNMP 
   // request for the OID is received, filesize_oid is the 
   // OID for which the handler is registered,
   // OID_LENGTH(filesize_oid) passes the length of the 
   // OID array to the agent.
   // HANDLER_CAN_RONLY is a constant that specifies that 
   // this handler only handles get requests.
   myreg1 = netsnmp_create_handler_registration 
   ("filesize", get_filesize, 
                filesize_oid, OID_LENGTH(filesize_oid), 
                HANDLER_CAN_RONLY);
                         
   // Assign the string fileX to the contextName member of the 
   // netsnmp_handler_registration struct
   myreg1->contextName=filexcon; 
   
   // Register the netsnmp_handler_registration struct with the
   // agent.  netsnmp_register_read_only is a helper function
   // that notifies the agent that this module only handles snmp 
   // get requests. 
   netsnmp_register_read_only_instance(myreg1);
   }