add_module_replacement man page on Oracle

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       add_mibdir,    netsnmp_init_mib,	  shutdown_mib,	  netsnmp_read_module,
       read_mib, read_all_mibs,	 add_module_replacement,  snmp_set_mib_errors,
       snmp_set_mib_warnings,	   snmp_set_save_descriptions,	   read_objid,
       snmp_parse_oid, get_module_node, print_mib, print_objid,	 fprint_objid,
       snprint_objid,  print_description, fprint_description, snprint_descrip‐
       tion - netsnmp_mib_api functions

       #include <net-snmp/mib_api.h>

   Initialisation and Shutdown
       int add_mibdir(const char *dirname);

       void netsnmp_init_mib(void);
       void shutdown_mib(void);

   Reading and Parsing MIBs
       struct tree *netsnmp_read_module(const char *name);
       struct tree *read_mib(const char *filename);
       struct tree *read_all_mibs(void);

       int add_module_replacement(const char *old_module,
				  const char *new_module,
				  const char *tag, int len);

       void snmp_set_mib_warnings(int level);
       void snmp_set_mib_errors(int level);
       void snmp_set_save_descriptions(int save);

   Searching the MIB Tree
       int  read_objid(const char *input,
		       oid *objid, size_t *objidlen);
       oid *snmp_parse_oid(const char *input,
		       oid *objid, size_t *objidlen);
       int  get_module_node(const char *name, const char *module,
		       oid *objid, size_t *objidlen);

       void  print_mib(FILE *fp);

       void  print_objid(const oid *objid, size_t objidlen);
       void fprint_objid(FILE *fp,
			 const oid *objid, size_t objidlen);
       int snprint_objid(char *buf, size_t len,
			 const oid *objid, size_t objidlen);

       void  print_description(const oid *objid, size_t objidlen, int width);
       void fprint_description(FILE *fp,
			       const oid *objid, size_t objidlen, int width);
       int snprint_description(char *buf, size_t len,
			       const oid *objid, size_t objidlen, int width);

       The functions dealing with MIB modules fall into four  groups  -	 those
       dealing	with  initialisation and shutdown, with reading in and parsing
       MIB files, with searching the MIB tree, and output routines.

   Initialisation and Shutdown
       add_mibdir is used to add the specified directory to the path of	 loca‐
       tions  which  are searched for files containing MIB modules.  Note that
       this does not actually load the MIB modules located in that  directory,
       but  is	simply	an  initialisation step to make them available to net‐
       snmp_read_module.  This function returns a count of files found in  the
       directory,  or  a  -1 if there is an error.  It should be called before
       invoking netsnmp_init_mib.

       netsnmp_init_mib	 configures  the  MIB  directory  search  path	(using
       add_mibdir  ),  sets  up the internal MIB framework, and then loads the
       appropriate MIB modules (using netsnmp_read_module and read_mib).   See
       the ENVIRONMENTAL VARIABLES section for details.
       It  should  be  called  before  any  other  routine that manipulates or
       accesses the MIB tree (but after any additional add_mibdir calls).

       shutdown_mib will clear the  information	 that  was  gathered  by  net‐
       snmp_read_module,   add_mibdir	and   add_module_replacement.	It  is
       strongly recommended that one does not invoke shutdown_mib while	 there
       are SNMP sessions being actively managed.

   Reading and Parsing MIBs
       netsnmp_read_module  takes  the name of a MIB module (which need not be
       the same as the name of the file that  contains	the  module),  locates
       this within the configured list of MIB directories, and loads the defi‐
       nitions from the module into the active MIB tree.  It  also  loads  any
       MIB modules listed in the IMPORTS clause of this module.

       read_mib	 is similar, but takes the name of the file containing the MIB
       module.	Note that this file need not be located within the MIB	direc‐
       tory  search  list  (although  any modules listed in the IMPORTS clause

       read_all_mibs will read in all the MIB modules found on the MIB	direc‐
       tory search list.

       In general the parser is silent about what strangenesses it sees in the
       MIB files. To get warnings reported, call snmp_set_mib_warnings with  a
       level of 1 (or 2 for even more warnings).

       add_module_replacement can be used to allow new MIB modules to obsolete
       older ones, without needing to amend the IMPORTS clauses of other  mod‐
       ules.   It takes the names of the old and new modules, together with an
       indication of which portions of the old module are affected.

	      tag      len	 load the new module when:
	      NULL     0	 always (the old module is a strict subset of
				 the new)
	      name     0	 for the given tag only
	      name     non-0	 for any identifier with this prefix
       It can also be used to handle errors in the module identifiers used  in
       MIB   IMPORTS   clauses	(such  as  referring  to  RFC1213  instead  of

   Searching the MIB Tree
       read_objid takes a string containing a textual  version	of  an	object
       identifier  (in either numeric or descriptor form), and transforms this
       into the corresponding list of sub-identifiers.	This  is  returned  in
       the  output  parameter, with the number of sub-identifiers returned via
       out_len.	 When called, out_len must hold the maximum length of the out‐
       put  array.   If	 multiple object identifiers are being processed, then
       this length should be reset before each call.  This function returns  a
       value of 1 if it succeeds in parsing the string and 0 otherwise.

       snmp_parse_oid is similar, but returns a pointer to the parsed OID buf‐
       fer (or NULL).

       get_module_node takes a descriptor  and	the  name  of  a  module,  and
       returns	the  corresponding  oid	 list,	in  the same way as read_objid
       If the module name is specified as "ANY", then this routine will assume
       that  the  descriptor  given is unique within the tree, and will return
       the matching entry.  If this assumption is invalid, then the  behaviour
       as to which variable is returned is implementation dependent.

       print_mib  will	print out a representation of the currently active MIB
       tree to the specified FILE pointer.

       print_objid will take an object identifier (as returned by  read_objid,
       snmp_parse_oid or get_module_node), and prints the textual form of this
       OID to the standard output.

       fprint_objid does the same, but prints to the FILE pointer specified by
       the initial parameter.

       snprint_objid prints the same information into the buffer pointed to by
       buf which is of length  len.   It  returns  the	number	of  characters
       printed, or -1 if the buffer was not large enough.  In the latter case,
       buf will typically contain a truncated version of the information  (but
       this behaviour is not guaranteed).

       print_description,  fprint_description,	and snprint_description take a
       similar object identifier and print out a version of the MIB definition
       for  that  object,  together with the full OID. The width argument con‐
       trols how the OID is layed out.

       By default the parser does not save  descriptions  since	 they  may  be
       huge.   In  order  to  be able to print them, it is necessary to invoke
       snmp_set_save_descriptions(1)before calling init_mib (or similar).

       The main use of environmental variables with respect to these API calls
       is  to configure which MIB modules should be loaded, and where they are

       MIBDIRS	 A colon separated list of directories to search for MIB  mod‐
		 Default: /usr/share/snmp/mibs
		 Used  by  init_mib,  netsnmp_read_module,  read_all_mibs  and
		 (implicitly) by read_mib.

       MIBS	 A colon separated list of MIB modules to load.
		 The default list of modules will depend on how	 the  Net-SNMP
		 software   was	  originally   compiled,   but	is  typically:

		 If the value of the MIBS environmental variable starts with a
		 '+' character, then these MIB modules will be	added  to  the
		 default  list.	  Otherwise  these modules (plus any that they
		 IMPORT from) will be loaded instead of the default list.

		 If the MIBS environmental variable has	 the  value  ALL  then
		 read_all_mibs	will  be called to load the full collection of
		 all available MIB modules.

		 Used by init_mib only.

       MIBFILES	 A colon separated list of files to load.
		 Default: (none)
		 Used by init_mib only.

       snmp_api(3), output_api(3)

V5.7.2				  13 Aug 2010		    NETSNMP_MIB_API(3)

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