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README for demo_module_3

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

This code example shows you how to modify the code generated by 

"mib2c -c mib2c.iterate.conf" command to perform data retrieval for

a general table. 

Introduction

------------

General tables are different from simple tables in one of the following

ways: 

  - index is not a single integer 

  - maximum index is not easily determinable

  - not all indexes are valid

  - table data is not directly accessible, such as the interfaces table

See the System Management Agent Developer's Guide 

for more information about general tables data retrieval.

This example uses some dummy data to perform data retrieval for a 

two-index table.  It was generated by using "mib2c -c mib2c.iterate.conf" 

against the me1ContactInfoTable group in the SDK-DEMO1-MIB.

Some functions have been added to the generated code to implement a 

link list to provide the test data.

mib2c created templates called me1ContactInfoTable.c and me1ContactInfoTable.h.

These were renamed demo_module_3.c and demo_module_3.h for this demo.  

Within me1ContactInfoTable.c, mib2c generated init_me1ContactInfoTable, and 

this was renamed to init_demo_module_3.

Note that even though the SDK-DEMO1-MIB file contains the specification of 

tables and scalar, running mib2c with mib2c.iterate.conf

generates template code only for the general table in the MIB.

How to Use the demo_module_3 Code Example

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

The demo_module_3 code example includes the following files, by default 

located in the directory /usr/demo/sma_snmp/demo_module_3.

Files:

o Makefile - Compiles the module source code

o demo_module_3.c - Source code for the module

o demo_module_3.h - Header file for the module

o SDK-DEMO1-MIB.txt - MIB file used in the module

To set up your 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_3  /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 generate code templates from the sample MIB:

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

   For example:

   % cd /home/username/demo/demo_module_3

2. Copy the SDK-DEMO1-MIB.txt file to the mibs directory you created for the 

   demos, if you have not already done so.

   For example:

   % cp SDK-DEMO1-MIB.txt /home/username/demo/mibs

3. 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-DEMO1-MIB

4. Run mib2c on the me1ContactInfoTable group in the SDK-DEMO1-MIB.

   For example:

   % mib2c -c mib2c.iterate.conf me1ContactInfoTable

   The mib2c utility generates the following template files:

   me1ContactInfoTable.c 

   me1ContactInfoTable.h

5. Compare the template files with the demo_module_3.c and the

   demo_module_3.h files. 

   The demo_module_3 files were created by modifying the templates. 

   The following code is to set up the table with two indexes:

            netsnmp_table_helper_add_indexes(table_info,

                   ASN_INTEGER, /* index: me1FloorNumber */

                   ASN_INTEGER, /* index: me1RoomNumber */

                   0);

   Care must be taken in returning the "NEXT" data when function

   me1ContactInfoTable_get_next_data_point() is called.

   For instance, in the example code:

       me1ContactEntry* nextNode = (me1ContactEntry*) *my_loop_context;

       nextNode = nextNode->pNext;

   The table data is pre-sorted so the next data is conveniently pointed by

   the pNext pointer. If your implementation is more complicated you should

   make sure the OIDs increase with the immediate next OID. (xxx.1.1, xxx.1.2, 

   etc).

To build the example:

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

   For example:

   % cd /home/username/demo/demo_module_3

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_3.so /home/username/demo/lib

Setting Up Agent to Run demo_module_3

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

1. As root, 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_3 /home/username/demo/lib/demo_module_3.so

2. As root, start the SMA snmp agent. If the agent is already running, 

   stop and restart it in debug mode.

   For example:

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

    # /usr/sbin/snmpd -Ddemo_module_3

    The optional -Ddemo_module_3 argument sends debugging statements from 

    demo_module_3 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 Module

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

1. As a non-root user, issue snmptable commands to retrieve table data from 

   the module.

   For example:

   % snmptable -v1 -c public localhost SDK-DEMO1-MIB::me1ContactInfoTable

   SNMP table: SDK-DEMO1-MIB::me1ContactInfoTable

   me1FloorNumber me1RoomNumber   me1Name me1Extension

                1          1004 John Doe          8004

                1          1007 John Doe          8007

                1          1010 John Doe          8000

                2          2003 John Doe          8003

                2          2006 John Doe          8006

                2          2009 John Doe          8009

                2          2012 John Doe          8002

                3          3005 John Doe          8005

                3          3008 John Doe          8008

                3          3011 John Doe          8001 

   or 

   % snmptable -v1 -c public localhost .1.3.6.1.4.1.42.2.2.4.4.1.3.1

   SNMP table: SDK-DEMO1-MIB::me1ContactInfoTable

   me1Extension   me1Name me1RoomNumber me1FloorNumber

           8004 John Doe           1004              1

           8007 John Doe           1007              1

           8000 John Doe           1010              1

           8003 John Doe           2003              2

           8006 John Doe           2006              2

           8009 John Doe           2009              2

           8002 John Doe           2012              2

           8005 John Doe           3005              3

           8008 John Doe           3008              3

           8001 John Doe           3011              3