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CentOS 7.0 - man page for netsnmp::agent (centos section 3)

agent(3)		       User Contributed Perl Documentation			 agent(3)

NAME
       NetSNMP::agent - Perl extension for the net-snmp agent.

SYNOPSIS
	 use NetSNMP::agent;

	 my $agent = new NetSNMP::agent('Name' => 'my_agent_name');

DESCRIPTION
       This module implements an API set to make a SNMP agent act as a snmp agent, a snmp
       subagent (using the AgentX subagent protocol) and/or embedded perl-APIs directly within
       the traditional net-snmp agent demon.

       Also see the tutorial about the genaral Net-SNMP C API, which this module implements in a
       perl-way, and a perl specific tutorial at:

	 http://www.net-snmp.org/tutorial-5/toolkit/

EXAMPLES
   Sub-agent example
	       use NetSNMP::agent (':all');
	       use NetSNMP::ASN qw(ASN_OCTET_STR);

	       my $value = "hello world";
	       sub myhandler {
		   my ($handler, $registration_info, $request_info, $requests) = @_;
		   my $request;

		   for($request = $requests; $request; $request = $request->next()) {
		       my $oid = $request->getOID();
		       if ($request_info->getMode() == MODE_GET) {
			   # ... generally, you would calculate value from oid
			   if ($oid == new NetSNMP::OID(".1.3.6.1.4.1.8072.9999.9999.7375.1.0")) {
			       $request->setValue(ASN_OCTET_STR, $value);
			   }
		       } elsif ($request_info->getMode() == MODE_GETNEXT) {
			   # ... generally, you would calculate value from oid
			   if ($oid < new NetSNMP::OID(".1.3.6.1.4.1.8072.9999.9999.7375.1.0")) {
			       $request->setOID(".1.3.6.1.4.1.8072.9999.9999.7375.1.0");
			       $request->setValue(ASN_OCTET_STR, $value);
			   }
		       } elsif ($request_info->getMode() == MODE_SET_RESERVE1) {
			   if ($oid != new NetSNMP::OID(".1.3.6.1.4.1.8072.9999.9999.7375.1.0")) {  # do error checking here
			       $request->setError($request_info, SNMP_ERR_NOSUCHNAME);
			   }
		       } elsif ($request_info->getMode() == MODE_SET_ACTION) {
			   # ... (or use the value)
			   $value = $request->getValue();
		       }
		   }

	       }

	       my $agent = new NetSNMP::agent(
				       # makes the agent read a my_agent_name.conf file
				       'Name' => "my_agent_name",
				       'AgentX' => 1
				       );
	       $agent->register("my_agent_name", ".1.3.6.1.4.1.8072.9999.9999.7375",
				\&myhandler);

	       my $running = 1;
	       while($running) {
		       $agent->agent_check_and_process(1);
	       }

	       $agent->shutdown();

   Embedded agent example
	       # place this in a .pl file, and then in your snmpd.conf file put:
	       #    perl do '/path/to/file.pl';

	       use NetSNMP::agent;
	       my $agent;

	       sub myhandler {
		   my ($handler, $registration_info, $request_info, $requests) = @_;
		   # ...
	       }

	       $agent = new NetSNMP::agent(
				       'Name' => 'my_agent_name'
				       );

	       $agent->register("my_agent_name", ".1.3.6.1.4.1.8072.9999.9999.7375",
				\&myhandler);

	       $agent->main_loop();

CONSTRUCTOR
	   new ( OPTIONS )
	       This is the constructor for a new NetSNMP::agent object.

	   Possible options are:

	       Name    - Name of the agent (optional, defaults to "perl")
			 (The snmp library will read a NAME.conf snmp
			 configuration file based on this argument.)
	       AgentX  - Make us a sub-agent (0 = false, 1 = true)
			 (The Net-SNMP master agent must be running first)
	       Ports   - Ports this agent will listen on (EG: "udp:161,tcp:161")

	   Example:

	       $agent = new NetSNMP::agent(
					'Name' => 'my_agent_name',
					'AgentX' => 1
					);

METHODS
	   register (NAME, OID, \&handler_routine )
	       Registers the callback handler with given OID.

	       $agent->register();

	       A return code of 0 indicates no error.

	   agent_check_and_process ( BLOCKING )
	       Run one iteration of the main loop.

	       BLOCKING - Blocking or non-blocking call. 1 = true, 0 = false.

	       $agent->agent_check_and_process(1);

	   main_loop ()
	       Runs the agent in a loop. Does not return.

	   shutdown ()
	       Nicely shuts down the agent or sub-agent.

	       $agent->shutdown();

HANDLER CALLBACKS
	   handler ( HANDLER, REGISTRATION_INFO, REQUEST_INFO, REQUESTS )

	       The handler is called with the following parameters:

	       HANDLER		       - FIXME
	       REGISTRATION_INFO       - what are the correct meanings of these?
	       REQUEST_INFO	       -
	       REQUESTS 	       -

	   Example handler:

	       sub myhandler {
		   my ($handler, $reg_info, $request_info, $requests) = @_;
		   # ...
	       }

       The handler subroutine will be called when a SNMP request received by the agent for
       anything below the registered OID.  The handler is passed 4 arguments: $handler,
       $registration_info, $request_info, $requests.  These match the arguments passed to the C
       version of the same API.  Note that they are not entirely complete objects but are
       functional "enough" at this point in time.

   $request_info object functions
	   getMode ()
	       Returns the mode of the request. See the MODES section for
	       list of valid modes.

	       $mode = $request->getMode();

   $registration_info object functions
	   getRootOID ()
	       Returns a NetSNMP::OID object that describes the registration
	       point that the handler is getting called for (in case you
	       register one handler function with multiple OIDs, which should
	       be rare anyway)

	       $root_oid = $request->getRootOID();

   $request object functions
	   next ()
	       Returns the next request in the list or undef if there is no
	       next request.

	       $request = $request->next();

	   getOID ()
	       Returns the oid of the request (a NetSNMP::OID class).

	       $oid = $request->getOID();

	   setOID (new NetSNMP::OID("someoid"))
	       Sets the OID of the request to a passed oid value.  This
	       should generally only be done during handling of GETNEXT
	       requests.

	       $request->setOID(new NetSNMP::OID("someoid"));

	   getValue ()
	       Returns the value of the request. Used for example when
	       setting values.

	       $value = $request->getValue();

	       FIXME: how to get the type of the value? Is it even available?
		      [Wes: no, not yet.]

	   setValue ( TYPE, DATA )
	       Sets the data to be returned to the daemon.

	       Returns 1 on success, 0 on error.

	       TYPE - Type of the data. See NetSNMP::ASN for valid types.
	       DATA - The data to return.

	       $ret = $request->setValue(ASN_OCTET_STR, "test");

	   setError ( REQUEST_INFO, ERROR_CODE )
	       Sets the given error code for the request. See the ERROR CODES
	       section for list of valid codes.

	       $request->setError($request_info, SNMP_ERR_NOTWRITABLE);

	   getProcessed ()
	       The processed flag indicates that a request does not need to
	       be dealt with because someone else (a higher handler) has
	       dealt with it already.

	       $processed = $request->getProcessed();

	   setProcessed ( PROCESSED )
	       Sets the processed flag flag in the request.  You generally
	       should not have to set this yourself.

	       PROCESSED - 0 = false, 1 = true

	       $request->setProcessed(1);

	   getDelegated ()
	       If you can handle a request in the background or at a future
	       time (EG, you're waiting on a file handle, or network traffic,
	       or ...), the delegated flag can be set in the request.  When
	       the request is processed in the future the flag should be set
	       back to 0 so the agent will know that it can wrap up the
	       original request and send it back to the manager.  This has
	       not been tested within perl, but it hopefully should work.

	       $delegated = $request->getDelegated();

	   setDelegated ( DELEGATED )
	       Sets the delegated flag.

	       DELEGATED - 0 = false, 1 = true

	       $request->setDelegated(1);

	   getRepeat ()
	       The repeat flag indicates that a getbulk operation is being
	       handled and this indicates how many answers need to be
	       returned.  Generally, if you didn't register to directly
	       handle getbulk support yourself, you won't need to deal with
	       this value.

	       $repeat = $request->getRepeat();

	   setRepeat ( REPEAT )
	       Sets the repeat count (decrement after answering requests if
	       you handle getbulk requests yourself)

	       REPEAT -  repeat count FIXME

	       $request->setRepeat(5);

	   getSourceIp ()

	       Gets the IPv4 address of the device making the request to the handler.

	       use Socket;
	       print "Source: ", inet_ntoa($request->getSourceIp()), "\n";

	   getDestIp ()

	       Gets the IPv4 address of the destination that the request was sent to.

	       use Socket;
	       print "Destination: ", inet_ntoa($request->getDestIp()), "\n";

MODES
	       MODE_GET
	       MODE_GETBULK
	       MODE_GETNEXT
	       MODE_SET_ACTION
	       MODE_SET_BEGIN
	       MODE_SET_COMMIT
	       MODE_SET_FREE
	       MODE_SET_RESERVE1
	       MODE_SET_RESERVE2
	       MODE_SET_UNDO

ERROR CODES
	       SNMP_ERR_NOERROR
	       SNMP_ERR_TOOBIG
	       SNMP_ERR_NOSUCHNAME
	       SNMP_ERR_BADVALUE
	       SNMP_ERR_READONLY
	       SNMP_ERR_GENERR
	       SNMP_ERR_NOACCESS
	       SNMP_ERR_WRONGTYPE
	       SNMP_ERR_WRONGLENGTH
	       SNMP_ERR_WRONGENCODING
	       SNMP_ERR_WRONGVALUE
	       SNMP_ERR_NOCREATION
	       SNMP_ERR_INCONSISTENTVALUE
	       SNMP_ERR_RESOURCEUNAVAILABLE
	       SNMP_ERR_COMMITFAILED
	       SNMP_ERR_UNDOFAILED
	       SNMP_ERR_AUTHORIZATIONERROR
	       SNMP_ERR_NOTWRITABLE

AUTHOR
       Please mail the net-snmp-users@lists.sourceforge.net mailing list for help, questions or
       comments about this module.

       Module written by:
	  Wes Hardaker	<hardaker@users.sourceforge.net>

       Documentation written by:
	  Toni Willberg <toniw@iki.fi>
	  Wes Hardaker	<hardaker@users.sourceforge.net>

SEE ALSO
       NetSNMP::OID(3), NetSNMP::ASN(3), perl(1).

perl v5.16.3				    2012-10-09					 agent(3)


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