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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.