eCos Reference Manual
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# MIB Compiler

In the directory `/snmp/agent/VERSION/utils/mib2c`, there are the following files:

    README-eCos             notes about running with a nonstandard
                            perl path.
    README.mib2c            the README from UCD; full instructions on
                            using mib2c
    mib2c                   the perl program
    mib2c.conf              a configuration file altered to include the
                            eCos/UCD
    mib2c.conf-ORIG         copyright and better #include paths; and
                            the ORIGinal.
    mib2c.storage.conf      other config files, not modified.
    mib2c.vartypes.conf

mib2c is provided BUT it requires the SNMP perl package SNMP-3.1.0, and that in turn requires perl nsPerl5.005_03 (part of Red Hat Linux from 6.0, April 1999).

These are available from the CPAN (“the Comprehensive Perl Archive Network”) as usual; http://www.cpan.org/ and links from there. Specifically:

- PERL itself: http://people.netscape.com/kristian/nsPerl/

- http://people.netscape.com/richm/nsPerl/nsPerl5.005_03-11-i686-linux.tar.gz

- SNMP.pl http://www.cpan.org/modules/01modules.index.html

- http://cpan.valueclick.com/modules/by-category/05_Networking_Devices_IPC/SNMP/

- http://www.cpan.org/authors/id/G/GS/GSM/SNMP.tar.gz

(note that the .tar.gz files are not browsable)

For documentation on the files produced, see the documentation available at http://ucd-snmp.ucdavis.edu/ in general, and file `AGENT.txt` in particular.

It is likely that the output of mib2c will be further customized depending on eCos customer needs; it’s easy to do this by editing the mib2c.conf file to add or remove whatever you need with the resulting C sources.

The UCD autoconf-style configuration does not apply to eCos. So if you add a completely new MIB to the agent, and support it using mib2c so that the my_new_mib.c file contains a init_my_new_mib() routine to register the MIB handler, you will also need to edit a couple of control files; these claim to be auto-generated, but in the eCos release, they’re not, don’t worry.

    PACKAGES/net/snmp/agent/VERSION/include/mib_module_includes.h

contains a number of lines like

    #include “mibgroup/mibII/interfaces.h”

so add your new MIB thus:

    #include “mibgroup/mibII/my_new_mib.h”

    PACKAGES/net/snmp/agent/VERSION/include/mib_module_inits.h

contains a number of lines like

    init_interfaces();
    init_dot3();

and so on; add your new MIB as follows:

    init_my_new_mib();

and this should work correctly.

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