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README for demo_module_6

***********************************************************************

This code example demonstrates how to implement a module in such a way that

more than one instance of the module can run simultaneously on a single host.

See the System Management Agent Developer's Guide for more information about

implementing multi-instance modules.

Introduction

============

The demo_module_6.c file shows how to write a module that registers an object

in two different contexts. It also shows how to check for the contextName in

a request and return a different value depending on the value of the

contextName.

The code example registers one object, filesize, in two different contexts,

fileX and fileY. This example registers the OIDs using a read-only instance

handler helper. The OIDs do not need to be read-only. You could also register

the OIDs using any of the SMA instance handler helper APIs.

The function get_filesize is registered to handle get requests for instances

of the filesize object. This function checks the contextName in the reginfo

structure that is passed to the function by the SMA agent. If the value of

contextName is fileX, the function returns fileX_data, which has been set to

the integer 111. If the value of contextName is fileY, the function returns

fileY_data, which has been set to the integer 999.

How to Build the demo_module_6 Code Example

===========================================

The demo_module_6 code example includes the following files, by default located

in the directory /usr/demo/sma_snmp/demo_module_6.

Files:

Makefile - makefile to build demo_module_6.so shared library file

demo_module_6.c - module source code

demo_module_6.h - module header file

SDK-DEMO6-MIB.txt - MIB file

get_demo_module_6 - Script that executes snmpget against the OID defined

in the module.

To set up your build environment for the demo:

1. Copy the demo code to a directory for which you have write permission.

For example:

% cp -R /usr/demo/sma_snmp/demo_module_6 /home/username/demo

2. Create a lib directory that you can use to store shared object libraries

that you generate from demo code examples, if you have not already done so.

For example:

% mkdir /home/username/demo/lib

3. Create a mibs directory that you can use to store MIB files for the demo

code examples, if you have not already done so.

For example:

% mkdir /home/username/demo/mibs

4. Set the CC environment variable to the location of the C compiler to be

used. For example, if you are using Sun ONE Studio:

% setenv CC /opt/SUNWspro/bin/cc

5. Set your PATH environment variable to include the appropriate paths, so that

needed binaries can be found during the compilation process.

For example, in the csh:

% setenv PATH .:/usr/bin:$PATH

To build the example:

1. Change to the directory where you copied the demo module files.

For example:

% cd /home/username/demo/demo_module_6

2. Use the make command to generate object files.

If you are running the 64-bit SPARC Solaris kernel, type:

% /usr/ccs/bin/make

If you are running the 32-bit SPARC Solaris kernel, type:

% /usr/ccs/bin/make ARCH=32

If you are running the Solaris x86 kernel, type:

% /usr/ccs/bin/make ARCH=32

3. Copy the module shared library object to the lib directory you created.

For example:

% cp demo_module_6.so /home/username/demo/lib

4. Copy the SDK-DEMO6-MIB.tx file to the mibs directory you created for the

demos.

For example:

% cp SDK-DEMO6-MIB.txt /home/username/demo/mibs

Setting Up Agent to Run the Multi-Instance Module

=================================================

To run this module, the agent must be configured for SNMPv3.

1. As root, stop the SNMP agent if it is running.

For example:

# /etc/init.d/init.sma stop

2. Set up an SNMP v3 user as follows, if you have not already done so.

Note that you should use "myuser" and "mypassword" -- do not replace with

other values because the test script expects these values.

# /usr/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]

<Return>

3. Edit the agent's configuration file /etc/sma/snmp/snmpd.conf,

and insert a dlmod statement for the module. This statement enables

the agent to load the module.

For example:

dlmod demo_module_6 /home/username/demo/lib/demo_module_6.so

4. Start the SMA snmp agent in debug mode.

For example:

# /usr/sbin/snmpd -Ddemo_module_6

The optional -Ddemo_module_6 argument sends debugging statements from

demo_module_6 to the /var/log/snmpd.log file. You can also use the -L

and -f options to send debugging statements to the screen instead.

Testing the demo_module_6 Module

================================

1. Set your MIBS and MIBDIRS environment variables to

include the appropriate paths.

For example, in the csh:

% setenv MIBDIRS .:/home/username/demo/mibs:/etc/sma/snmp/mibs

% setenv MIBS +SDK-DEMO6-MIB

Note that step 1 is not required, but it enables snmpget to access the MIB

to provide variable names instead of OIDs in its output.

2. Run the get_demo_module_6 script to access the agent:

% get_demo_module_6

SMA-SDK-MODULE-EXAMPLE1-MIB::me1FileSize.0 = INTEGER: 111

SMA-SDK-MODULE-EXAMPLE1-MIB::me1FileSize.0 = INTEGER: 999

The first snmpget in the script accesses the module whose contextName is

fileX, and the second snmpget accesses the module whose contextName is

fileY.