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GENSNMPTREE(1)		FreeBSD	General	Commands Manual		GENSNMPTREE(1)

     gensnmptree -- generate C and header files	from a MIB description file

     gensnmptree [-dEehlt] [-I directory] [-i infile] [-p prefix] [name	...]

     The gensnmptree utility is	used to	either generate	C language tables and
     header files from a MIB description or to numeric OIDs from MIB descrip-
     tions.  The first form is used only for maintaining the bsnmpd(1) daemon
     or	for module writers.  The second	form may be used by SNMP client	pro-
     gram writers.

     If	none of	the options -e,	-E or -t are used gensnmptree reads a MIB
     description from its standard input and creates two files:	a C-file
     prefixtree.c containing a table used by bsnmpd(1) during PDU processing
     and a header file prefixtree.h containing appropriate declarations	of the
     callback functions	used in	this table, the	table itself and definitions
     for all enums.

     The following options are available:

     -d	 Switch	on debugging.

     -E	 Extract enumerations and bit constructs.  In this mode	the tool emits
	 a header file that contains for each type given on the	command	line a
	 C-enum	definition and a preprocessor define that may be used to map
	 values	to strings.

     -e	 gensnmptree expects MIB variable names	(only the last component) on
	 its command line.  It reads a MIB specification from standard input
	 and for each MIB variable name	emits three C preprocessor defines on
	 its standard output:

	 OIDX_name    This define can be used to initialize a struct asn_oid
		      in the following way:

			    const struct asn_oid oid_sysDescr =	OIDX_sysDescr;

	 OIDLEN_name  is the length of the OID.

	 OID_name     is the last component of the OID.

     -h	 Print a short help page.

     -I	directory
	 Add the named directory to the	include	path just before the standard
	 include directories.

     -i	infile
	 Read from the named file instead of standard input.

     -l	 Generate local	preprocessor includes.	This is	used for bootstrapping

     -t	 Instead of normal output print	the resulting tree.

     -p	prefix
	 Prefix	the file names and the table name with prefix.

     The syntax	of the MIB description file can	formally be specified as fol-

	    file := top	| top file

	    top	:= tree	| typedef | include

	    tree := head elements ')'

	    entry := head ':' index STRING elements ')'

	    leaf := head type STRING ACCESS ')'

	    column := head type	ACCESS ')'

	    type := BASETYPE | BASETYPE	'|' subtype | enum | bits

	    subtype := STRING

	    enum := ENUM '(' value ')'

	    bits := BITS '(' value ')'

	    value := INT STRING	| INT STRING value

	    head := '('	INT STRING

	    elements :=	EMPTY |	elements element

	    element := tree | leaf | column

	    index := type | index type

	    typedef := 'typedef' STRING	type

	    include := 'include' filespec

	    filespec :=	'"' STRING '"' | '<' STRING '>'

     BASETYPE specifies	a SNMP data type and may be one	of
	   +o   NULL
	   +o   INTEGER
	   +o   INTEGER32 (same as INTEGER)
	   +o   UNSIGNED32 (same	as GAUGE)
	   +o   IPADDRESS
	   +o   OID
	   +o   TIMETICKS
	   +o   COUNTER
	   +o   GAUGE
	   +o   COUNTER64

     ACCESS specifies the accessibility	of the MIB variable (which operation
     can be performed) and is one of
	   +o   GET
	   +o   SET

     INT is a decimal integer and STRING is any	string starting	with a letter
     or	underscore and consisting of letters, digits, underscores and minuses,
     that is not one of	the keywords.

     The typedef directive associates a	type with a single name.

     The include directive is replaced by the contents of the named file.

     The following MIB description describes the system	group:

	   include "tc.def"

	   typedef AdminStatus ENUM (
		   1 up
		   2 down

	   (1 internet
	     (2	mgmt
	       (1 mibII
		 (1 system
		   (1 sysDescr OCTETSTRING op_system_group GET)
		   (2 sysObjectId OID op_system_group GET)
		   (3 sysUpTime	TIMETICKS op_system_group GET)
		   (4 sysContact OCTETSTRING op_system_group GET SET)
		   (5 sysName OCTETSTRING op_system_group GET SET)
		   (6 sysLocation OCTETSTRING op_system_group GET SET)
		   (7 sysServices INTEGER op_system_group GET)
		   (8 sysORLastChange TIMETICKS	op_system_group	GET)
		   (9 sysORTable
		     (1	sysOREntry : INTEGER op_or_table
		       (1 sysORIndex INTEGER)
		       (2 sysORID OID GET)
		       (3 sysORDescr OCTETSTRING GET)
		       (4 sysORUpTime TIMETICKS	GET)


     Hartmut Brandt <>

FreeBSD	10.1			 May 26, 2006			  FreeBSD 10.1


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