MIB2C(1)							     Net-SNMP								  MIB2C(1)

NAME

       mib2c -- generate template code for extending the agent

SYNOPSIS

       mib2c [-h] -c CONFIGFILE [-I PATH] [-f OUTNAME] [-i][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 "iter-
	      ate"  over it to find the right data for the SNMP row being accessed.  See the agent/mibgroup/mibII/vacm_context.c file for an exam-
	      ple:

		   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 ta-
	      ble 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.

       -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.

SEE ALSO

       snmpcmd(1), snmp.conf(5)

4th Berkeley Distribution					    25 Jul 2003 							  MIB2C(1)