mib2c - Online in the Cloud

PROGRAM:

NAME

mib2c -- generate template code for extending the agent

SYNOPSIS

mib2c [-h] -c CONFIGFILE [-I PATH] [-f OUTNAME] [-i][-s][-q][-S VAR=VAL] MIBNODE

DESCRIPTION

The mib2c tool is designed to take a portion of the MIB tree (as defined by a MIB file)
and generate the template C code necessary to implement the relevant management objects
within it.

In order to implement a new MIB module, three files are necessary:

- MIB definition file
- C header file
- C implementation file.

The mib2c tool uses the MIB definition file to produce the two C code files. Thus, mib2c
generates a template that you can edit to add logic necessary to obtain information from
the operating system or application to complete the module.

MIBNODE is the top level mib node you want to generate code for. You must give mib2c a
mib node (e.g. ifTable) on the command line, not a mib file. This is the single most
common mistake.

The mib2c tool accepts both SMIv1 and SMIv2 MIBs.

mib2c needs to be able to find and load a MIB file in order to generate C code for the
MIB. To enable mib2c to find the MIB file, set the MIBS environment variable to include
the MIB file you are using. An example of setting this environment variable is:

MIBS=+NET-SNMP-TUTORIAL-MIB

or

MIBS=ALL

The first example ensures that mib2c finds the NET-SNMP-TUTORIAL-MIB mib, in addition to
the default MIB modules. The default list of MIB modules is set when the suite is first
configured and built and basically corresponds to the list of modules that the agent
supports. The second example ensures that mib2c finds all MIBs in the search location for
MIB files. The default search location for MIB files is /usr/share/snmp/mibs. This search
location can be modified by the MIBDIRS environment variable.

Both the MIB files to be loaded and the MIB file search location can also be configured in
the snmp.conf file. Please see snmp.conf(5) for more information.

The generated *.c and *.h files will be created in the current working directory.

OPTIONS

-h Display a help message.

-c CONFIGFILE
Use CONFIGFILE when generating code. These files will be searched for first in the
current directory and then in the /usr/share directory (which is where the default
mib2c configuration files can be found). Running mib2c without the -c CONFIGFILE
option will display a description of the valid values for CONFIGFILE, that is, the
available config files, including new ones that you might author.

For example,

% mib2c ifTable

will display a description of the currently available values for CONFIGFILE.

The following values are supported for CONFIGFILE:

mib2c.mfd.conf
mib2c.scalar.conf
mib2c.int_watch.conf
mib2c.iterate.conf
mib2c.create-dataset.conf
mib2c.array-user.conf
mib2c.column_defines.conf
mib2c.column_enums.conf

GENERATING CODE FOR SCALAR OBJECTS:

If you're writing code for some scalars, run:

mib2c -c mib2c.scalar.conf MIBNODE

If you want to magically "tie" integer variables to integer scalars, use:

mib2c -c mib2c.int_watch.conf MIBNODE

GENERATING CODE FOR TABLES:

The recommended configuration file for tables is the MIBs for Dummies, or MFD,
configuration file. It hides as much of the SNMP details as possible, generating
small, easy to understand functions. It is also the most flexible and well
documented configuration file. See the agent/mibgroup/if-mib/ifTable/ifTable*.c
files for an example:

mib2c -c mib2c.mfd.conf MIBNODE

If your table data is kept somewhere else (e.g. it's in the kernel and not in the
memory of the agent itself) and you need to "iterate" over it to find the right
data for the SNMP row being accessed. See the agent/mibgroup/mibII/vacm_context.c
file for an example:

mib2c -c mib2c.iterate.conf MIBNODE

If your table data is kept in the agent (i.e. it's not located in an external
source) and is purely data driven (i.e. you do not need to perform any work when a
set occurs). See the agent/mibgroup/examples/data_set.c file for an example of
such a table:

mib2c -c mib2c.create-dataset.conf MIBNODE

If your table data is kept in the agent (i.e. it's not located in an external
source), and you can keep your data sorted by the table index but you do need to
perform work when a set occurs:

mib2c -c mib2c.array-user.conf MIBNODE

GENERATING HEADER FILE DEFINITIONS

To generate just a header with a define for each column number in your table:

mib2c -c mib2c.column_defines.conf MIBNODE

To generate just a header with a define for each enum for any column containing
enums:

mib2c -c mib2c.column_enums.conf MIBNODE

GENERATING CODE FOR THE 4.X LINE OF CODE (THE OLDER API)

mib2c -c mib2c.old-api.conf MIBNODE

-IPATH Search for configuration files in PATH. Multiple paths can be specified using
multiple -I switches or by using one with a comma separated list of paths in it.

-f OUTNAME
Places the output code into OUTNAME.c and OUTNAME.h. Normally, mib2c will place the
output code into files which correspond to the table names it is generating code
for, which is probably what you want anyway.

-i Do not run indent on the resulting code.

-s Do not look for MIBNODE.sed and run sed on the resulting code. This is useful to
shorten long mib variable names in the code.

-q Run in "quiet" mode, which minimizes the status messages mib2c generates.

-SVAR=VAL
Preset a variable VAR, in the mib2c.*.conf file, to the value VAL. None of the
existing mib2c configuration files (mib2c.*.conf) currently makes use of this
feature, however, so this option should be considered available only for future
use.

EXAMPLES

The following generates C template code for the header and implementation files to
implement UCD-DEMO-MIB::ucdDemoPublic.

% mib2c -c mib2c.scalar.conf ucdDemoPublic
writing to ucdDemoPublic.h
writing to ucdDemoPublic.c
running indent on ucdDemoPublic.h
running indent on ucdDemoPublic.c

The resulting ucdDemoPublic.c and ucdDemoPublic.h files are generated the current working
directory.

The following generates C template code for the header and implementation files for the
module to implement TCP-MIB::tcpConnTable.

% mib2c -c mib2c.iterate.conf tcpConnTable
writing to tcpConnTable.h
writing to tcpConnTable.c
running indent on tcpConnTable.h
running indent on tcpConnTable.c

The resulting tcpConnTable.c and tcpConnTable.h files are generated in the current working
directory.

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