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Filename : SNMP_util.pm
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### - *- mode: Perl -*-
######################################################################
### SNMP_util -- SNMP utilities using SNMP_Session.pm and BER.pm
######################################################################
### Copyright (c) 1998-2010, Mike Mitchell.
###
### This program is free software; you can redistribute it under the
### "Artistic License 2.0" included in this distribution
### (file "Artistic").
######################################################################
### Created by:  Mike Mitchell   <Mike.Mitchell@sas.com>
###
### Contributions and fixes by:
###
### Tobias Oetiker <tobi@oetiker.ch>:  Basic layout
### Simon Leinen <simon@switch.ch>: SNMP_session.pm/BER.pm
### Jeff Allen <jeff.allen@acm.org>: length() of undefined value
### Johannes Demel <demel@zid.tuwien.ac.at>: MIB file parse problem
### Simon Leinen <simon@switch.ch>: more OIDs from Interface MIB
### Jacques Supcik <supcik@ip-plus.net>: Specify local IP, port
### Tobias Oetiker <tobi@oetiker.ch>: HASH as first OID to set SNMP options
### Simon Leinen <simon@switch.ch>: 'undefined port' bug
### Daniel McDonald <dmcdonald@digicontech.com>: request for getbulk support
### Laurent Girod <it.fb@net2000.ch>: code for snmpwalkhash
### Ian Duplisse <i.duplisse@cablelabs.com>: MIB parsing suggestions
### Jakob Ilves <jakob.ilves@oracle.com>: return_array_refs for snmpwalk()
### Valerio Bontempi <v.bontempi@inwind.it>: IPv6 support
### Lorenzo Colitti <lorenzo@colitti.com>: IPv6 support
### Joerg Kummer <JOERG.KUMMER@Roche.COM>: TimeTicks support in snmpset()
### Christopher J. Tengi <tengi@CS.Princeton.EDU>: Gauge32 support in snmpset()
### Nicolai Petri <nicolai@catpipe.net>: hashref passing for snmpwalkhash()
### <jaccobs@online.nl>: parse NOTIFICATION-TYPE in MIB
### Dan Thorson <Dan.Thorson@seagate.com>: handle quotes in MIB comments better
######################################################################

package SNMP_util;

require 5.004;

use strict;
use vars qw(@ISA @EXPORT $VERSION);
use Exporter;
use Carp;

use BER "1.02";
use SNMP_Session "1.00";
use Socket;

$VERSION = '1.15';

@ISA = qw(Exporter);

@EXPORT = qw(snmpget snmpgetnext snmpwalk snmpset snmptrap snmpgetbulk snmpmaptable snmpmaptable4 snmpwalkhash snmpmapOID snmpMIB_to_OID snmpLoad_OID_Cache snmpQueue_MIB_File);

# The OID numbers from RFC1213 (MIB-II) and RFC1315 (Frame Relay)
# are pre-loaded below.
%SNMP_util::OIDS = 
  (
    'iso' => '1',
    'org' => '1.3',
    'dod' => '1.3.6',
    'internet' => '1.3.6.1',
    'directory' => '1.3.6.1.1',
    'mgmt' => '1.3.6.1.2',
    'mib-2' => '1.3.6.1.2.1',
    'system' => '1.3.6.1.2.1.1',
    'sysDescr' => '1.3.6.1.2.1.1.1.0',
    'sysObjectID' => '1.3.6.1.2.1.1.2.0',
    'sysUpTime' => '1.3.6.1.2.1.1.3.0',
    'sysUptime' => '1.3.6.1.2.1.1.3.0',
    'sysContact' => '1.3.6.1.2.1.1.4.0',
    'sysName' => '1.3.6.1.2.1.1.5.0',
    'sysLocation' => '1.3.6.1.2.1.1.6.0',
    'sysServices' => '1.3.6.1.2.1.1.7.0',
    'interfaces' => '1.3.6.1.2.1.2',
    'ifNumber' => '1.3.6.1.2.1.2.1.0',
    'ifTable' => '1.3.6.1.2.1.2.2',
    'ifEntry' => '1.3.6.1.2.1.2.2.1',
    'ifIndex' => '1.3.6.1.2.1.2.2.1.1',
    'ifInOctets' => '1.3.6.1.2.1.2.2.1.10',
    'ifInUcastPkts' => '1.3.6.1.2.1.2.2.1.11',
    'ifInNUcastPkts' => '1.3.6.1.2.1.2.2.1.12',
    'ifInDiscards' => '1.3.6.1.2.1.2.2.1.13',
    'ifInErrors' => '1.3.6.1.2.1.2.2.1.14',
    'ifInUnknownProtos' => '1.3.6.1.2.1.2.2.1.15',
    'ifOutOctets' => '1.3.6.1.2.1.2.2.1.16',
    'ifOutUcastPkts' => '1.3.6.1.2.1.2.2.1.17',
    'ifOutNUcastPkts' => '1.3.6.1.2.1.2.2.1.18',
    'ifOutDiscards' => '1.3.6.1.2.1.2.2.1.19',
    'ifDescr' => '1.3.6.1.2.1.2.2.1.2',
    'ifOutErrors' => '1.3.6.1.2.1.2.2.1.20',
    'ifOutQLen' => '1.3.6.1.2.1.2.2.1.21',
    'ifSpecific' => '1.3.6.1.2.1.2.2.1.22',
    'ifType' => '1.3.6.1.2.1.2.2.1.3',
    'ifMtu' => '1.3.6.1.2.1.2.2.1.4',
    'ifSpeed' => '1.3.6.1.2.1.2.2.1.5',
    'ifPhysAddress' => '1.3.6.1.2.1.2.2.1.6',
    'ifAdminHack' => '1.3.6.1.2.1.2.2.1.7',  
    'ifAdminStatus' => '1.3.6.1.2.1.2.2.1.7',
    'ifOperHack' => '1.3.6.1.2.1.2.2.1.8',             
    'ifOperStatus' => '1.3.6.1.2.1.2.2.1.8',
    'ifLastChange' => '1.3.6.1.2.1.2.2.1.9',
    'at' => '1.3.6.1.2.1.3',
    'atTable' => '1.3.6.1.2.1.3.1',
    'atEntry' => '1.3.6.1.2.1.3.1.1',
    'atIfIndex' => '1.3.6.1.2.1.3.1.1.1',
    'atPhysAddress' => '1.3.6.1.2.1.3.1.1.2',
    'atNetAddress' => '1.3.6.1.2.1.3.1.1.3',
    'ip' => '1.3.6.1.2.1.4',
    'ipForwarding' => '1.3.6.1.2.1.4.1',
    'ipOutRequests' => '1.3.6.1.2.1.4.10',
    'ipOutDiscards' => '1.3.6.1.2.1.4.11',
    'ipOutNoRoutes' => '1.3.6.1.2.1.4.12',
    'ipReasmTimeout' => '1.3.6.1.2.1.4.13',
    'ipReasmReqds' => '1.3.6.1.2.1.4.14',
    'ipReasmOKs' => '1.3.6.1.2.1.4.15',
    'ipReasmFails' => '1.3.6.1.2.1.4.16',
    'ipFragOKs' => '1.3.6.1.2.1.4.17',
    'ipFragFails' => '1.3.6.1.2.1.4.18',
    'ipFragCreates' => '1.3.6.1.2.1.4.19',
    'ipDefaultTTL' => '1.3.6.1.2.1.4.2',
    'ipAddrTable' => '1.3.6.1.2.1.4.20',
    'ipAddrEntry' => '1.3.6.1.2.1.4.20.1',
    'ipAdEntAddr' => '1.3.6.1.2.1.4.20.1.1',
    'ipAdEntIfIndex' => '1.3.6.1.2.1.4.20.1.2',
    'ipAdEntNetMask' => '1.3.6.1.2.1.4.20.1.3',
    'ipAdEntBcastAddr' => '1.3.6.1.2.1.4.20.1.4',
    'ipAdEntReasmMaxSize' => '1.3.6.1.2.1.4.20.1.5',
    'ipRouteTable' => '1.3.6.1.2.1.4.21',
    'ipRouteEntry' => '1.3.6.1.2.1.4.21.1',
    'ipRouteDest' => '1.3.6.1.2.1.4.21.1.1',
    'ipRouteAge' => '1.3.6.1.2.1.4.21.1.10',
    'ipRouteMask' => '1.3.6.1.2.1.4.21.1.11',
    'ipRouteMetric5' => '1.3.6.1.2.1.4.21.1.12',
    'ipRouteInfo' => '1.3.6.1.2.1.4.21.1.13',
    'ipRouteIfIndex' => '1.3.6.1.2.1.4.21.1.2',
    'ipRouteMetric1' => '1.3.6.1.2.1.4.21.1.3',
    'ipRouteMetric2' => '1.3.6.1.2.1.4.21.1.4',
    'ipRouteMetric3' => '1.3.6.1.2.1.4.21.1.5',
    'ipRouteMetric4' => '1.3.6.1.2.1.4.21.1.6',
    'ipRouteNextHop' => '1.3.6.1.2.1.4.21.1.7',
    'ipRouteType' => '1.3.6.1.2.1.4.21.1.8',
    'ipRouteProto' => '1.3.6.1.2.1.4.21.1.9',
    'ipNetToMediaTable' => '1.3.6.1.2.1.4.22',
    'ipNetToMediaEntry' => '1.3.6.1.2.1.4.22.1',
    'ipNetToMediaIfIndex' => '1.3.6.1.2.1.4.22.1.1',
    'ipNetToMediaPhysAddress' => '1.3.6.1.2.1.4.22.1.2',
    'ipNetToMediaNetAddress' => '1.3.6.1.2.1.4.22.1.3',
    'ipNetToMediaType' => '1.3.6.1.2.1.4.22.1.4',
    'ipRoutingDiscards' => '1.3.6.1.2.1.4.23',
    'ipInReceives' => '1.3.6.1.2.1.4.3',
    'ipInHdrErrors' => '1.3.6.1.2.1.4.4',
    'ipInAddrErrors' => '1.3.6.1.2.1.4.5',
    'ipForwDatagrams' => '1.3.6.1.2.1.4.6',
    'ipInUnknownProtos' => '1.3.6.1.2.1.4.7',
    'ipInDiscards' => '1.3.6.1.2.1.4.8',
    'ipInDelivers' => '1.3.6.1.2.1.4.9',
    'icmp' => '1.3.6.1.2.1.5',
    'icmpInMsgs' => '1.3.6.1.2.1.5.1',
    'icmpInTimestamps' => '1.3.6.1.2.1.5.10',
    'icmpInTimestampReps' => '1.3.6.1.2.1.5.11',
    'icmpInAddrMasks' => '1.3.6.1.2.1.5.12',
    'icmpInAddrMaskReps' => '1.3.6.1.2.1.5.13',
    'icmpOutMsgs' => '1.3.6.1.2.1.5.14',
    'icmpOutErrors' => '1.3.6.1.2.1.5.15',
    'icmpOutDestUnreachs' => '1.3.6.1.2.1.5.16',
    'icmpOutTimeExcds' => '1.3.6.1.2.1.5.17',
    'icmpOutParmProbs' => '1.3.6.1.2.1.5.18',
    'icmpOutSrcQuenchs' => '1.3.6.1.2.1.5.19',
    'icmpInErrors' => '1.3.6.1.2.1.5.2',
    'icmpOutRedirects' => '1.3.6.1.2.1.5.20',
    'icmpOutEchos' => '1.3.6.1.2.1.5.21',
    'icmpOutEchoReps' => '1.3.6.1.2.1.5.22',
    'icmpOutTimestamps' => '1.3.6.1.2.1.5.23',
    'icmpOutTimestampReps' => '1.3.6.1.2.1.5.24',
    'icmpOutAddrMasks' => '1.3.6.1.2.1.5.25',
    'icmpOutAddrMaskReps' => '1.3.6.1.2.1.5.26',
    'icmpInDestUnreachs' => '1.3.6.1.2.1.5.3',
    'icmpInTimeExcds' => '1.3.6.1.2.1.5.4',
    'icmpInParmProbs' => '1.3.6.1.2.1.5.5',
    'icmpInSrcQuenchs' => '1.3.6.1.2.1.5.6',
    'icmpInRedirects' => '1.3.6.1.2.1.5.7',
    'icmpInEchos' => '1.3.6.1.2.1.5.8',
    'icmpInEchoReps' => '1.3.6.1.2.1.5.9',
    'tcp' => '1.3.6.1.2.1.6',
    'tcpRtoAlgorithm' => '1.3.6.1.2.1.6.1',
    'tcpInSegs' => '1.3.6.1.2.1.6.10',
    'tcpOutSegs' => '1.3.6.1.2.1.6.11',
    'tcpRetransSegs' => '1.3.6.1.2.1.6.12',
    'tcpConnTable' => '1.3.6.1.2.1.6.13',
    'tcpConnEntry' => '1.3.6.1.2.1.6.13.1',
    'tcpConnState' => '1.3.6.1.2.1.6.13.1.1',
    'tcpConnLocalAddress' => '1.3.6.1.2.1.6.13.1.2',
    'tcpConnLocalPort' => '1.3.6.1.2.1.6.13.1.3',
    'tcpConnRemAddress' => '1.3.6.1.2.1.6.13.1.4',
    'tcpConnRemPort' => '1.3.6.1.2.1.6.13.1.5',
    'tcpInErrs' => '1.3.6.1.2.1.6.14',
    'tcpOutRsts' => '1.3.6.1.2.1.6.15',
    'tcpRtoMin' => '1.3.6.1.2.1.6.2',
    'tcpRtoMax' => '1.3.6.1.2.1.6.3',
    'tcpMaxConn' => '1.3.6.1.2.1.6.4',
    'tcpActiveOpens' => '1.3.6.1.2.1.6.5',
    'tcpPassiveOpens' => '1.3.6.1.2.1.6.6',
    'tcpAttemptFails' => '1.3.6.1.2.1.6.7',
    'tcpEstabResets' => '1.3.6.1.2.1.6.8',
    'tcpCurrEstab' => '1.3.6.1.2.1.6.9',
    'udp' => '1.3.6.1.2.1.7',
    'udpInDatagrams' => '1.3.6.1.2.1.7.1',
    'udpNoPorts' => '1.3.6.1.2.1.7.2',
    'udpInErrors' => '1.3.6.1.2.1.7.3',
    'udpOutDatagrams' => '1.3.6.1.2.1.7.4',
    'udpTable' => '1.3.6.1.2.1.7.5',
    'udpEntry' => '1.3.6.1.2.1.7.5.1',
    'udpLocalAddress' => '1.3.6.1.2.1.7.5.1.1',
    'udpLocalPort' => '1.3.6.1.2.1.7.5.1.2',
    'egp' => '1.3.6.1.2.1.8',
    'egpInMsgs' => '1.3.6.1.2.1.8.1',
    'egpInErrors' => '1.3.6.1.2.1.8.2',
    'egpOutMsgs' => '1.3.6.1.2.1.8.3',
    'egpOutErrors' => '1.3.6.1.2.1.8.4',
    'egpNeighTable' => '1.3.6.1.2.1.8.5',
    'egpNeighEntry' => '1.3.6.1.2.1.8.5.1',
    'egpNeighState' => '1.3.6.1.2.1.8.5.1.1',
    'egpNeighStateUps' => '1.3.6.1.2.1.8.5.1.10',
    'egpNeighStateDowns' => '1.3.6.1.2.1.8.5.1.11',
    'egpNeighIntervalHello' => '1.3.6.1.2.1.8.5.1.12',
    'egpNeighIntervalPoll' => '1.3.6.1.2.1.8.5.1.13',
    'egpNeighMode' => '1.3.6.1.2.1.8.5.1.14',
    'egpNeighEventTrigger' => '1.3.6.1.2.1.8.5.1.15',
    'egpNeighAddr' => '1.3.6.1.2.1.8.5.1.2',
    'egpNeighAs' => '1.3.6.1.2.1.8.5.1.3',
    'egpNeighInMsgs' => '1.3.6.1.2.1.8.5.1.4',
    'egpNeighInErrs' => '1.3.6.1.2.1.8.5.1.5',
    'egpNeighOutMsgs' => '1.3.6.1.2.1.8.5.1.6',
    'egpNeighOutErrs' => '1.3.6.1.2.1.8.5.1.7',
    'egpNeighInErrMsgs' => '1.3.6.1.2.1.8.5.1.8',
    'egpNeighOutErrMsgs' => '1.3.6.1.2.1.8.5.1.9',
    'egpAs' => '1.3.6.1.2.1.8.6',
    'transmission' => '1.3.6.1.2.1.10',
    'frame-relay' => '1.3.6.1.2.1.10.32',
    'frDlcmiTable' => '1.3.6.1.2.1.10.32.1',
    'frDlcmiEntry' => '1.3.6.1.2.1.10.32.1.1',
    'frDlcmiIfIndex' => '1.3.6.1.2.1.10.32.1.1.1',
    'frDlcmiState' => '1.3.6.1.2.1.10.32.1.1.2',
    'frDlcmiAddress' => '1.3.6.1.2.1.10.32.1.1.3',
    'frDlcmiAddressLen' => '1.3.6.1.2.1.10.32.1.1.4',
    'frDlcmiPollingInterval' => '1.3.6.1.2.1.10.32.1.1.5',
    'frDlcmiFullEnquiryInterval' => '1.3.6.1.2.1.10.32.1.1.6',
    'frDlcmiErrorThreshold' => '1.3.6.1.2.1.10.32.1.1.7',
    'frDlcmiMonitoredEvents' => '1.3.6.1.2.1.10.32.1.1.8',
    'frDlcmiMaxSupportedVCs' => '1.3.6.1.2.1.10.32.1.1.9',
    'frDlcmiMulticast' => '1.3.6.1.2.1.10.32.1.1.10',
    'frCircuitTable' => '1.3.6.1.2.1.10.32.2',
    'frCircuitEntry' => '1.3.6.1.2.1.10.32.2.1',
    'frCircuitIfIndex' => '1.3.6.1.2.1.10.32.2.1.1',
    'frCircuitDlci' => '1.3.6.1.2.1.10.32.2.1.2',
    'frCircuitState' => '1.3.6.1.2.1.10.32.2.1.3',
    'frCircuitReceivedFECNs' => '1.3.6.1.2.1.10.32.2.1.4',
    'frCircuitReceivedBECNs' => '1.3.6.1.2.1.10.32.2.1.5',
    'frCircuitSentFrames' => '1.3.6.1.2.1.10.32.2.1.6',
    'frCircuitSentOctets' => '1.3.6.1.2.1.10.32.2.1.7',
    'frOutOctets' => '1.3.6.1.2.1.10.32.2.1.7',
    'frCircuitReceivedFrames' => '1.3.6.1.2.1.10.32.2.1.8',
    'frCircuitReceivedOctets' => '1.3.6.1.2.1.10.32.2.1.9',
    'frInOctets' => '1.3.6.1.2.1.10.32.2.1.9',
    'frCircuitCreationTime' => '1.3.6.1.2.1.10.32.2.1.10',
    'frCircuitLastTimeChange' => '1.3.6.1.2.1.10.32.2.1.11',
    'frCircuitCommittedBurst' => '1.3.6.1.2.1.10.32.2.1.12',
    'frCircuitExcessBurst' => '1.3.6.1.2.1.10.32.2.1.13',
    'frCircuitThroughput' => '1.3.6.1.2.1.10.32.2.1.14',
    'frErrTable' => '1.3.6.1.2.1.10.32.3',
    'frErrEntry' => '1.3.6.1.2.1.10.32.3.1',
    'frErrIfIndex' => '1.3.6.1.2.1.10.32.3.1.1',
    'frErrType' => '1.3.6.1.2.1.10.32.3.1.2',
    'frErrData' => '1.3.6.1.2.1.10.32.3.1.3',
    'frErrTime' => '1.3.6.1.2.1.10.32.3.1.4',
    'frame-relay-globals' => '1.3.6.1.2.1.10.32.4',
    'frTrapState' => '1.3.6.1.2.1.10.32.4.1',
    'snmp' => '1.3.6.1.2.1.11',
    'snmpInPkts' => '1.3.6.1.2.1.11.1',
    'snmpInBadValues' => '1.3.6.1.2.1.11.10',
    'snmpInReadOnlys' => '1.3.6.1.2.1.11.11',
    'snmpInGenErrs' => '1.3.6.1.2.1.11.12',
    'snmpInTotalReqVars' => '1.3.6.1.2.1.11.13',
    'snmpInTotalSetVars' => '1.3.6.1.2.1.11.14',
    'snmpInGetRequests' => '1.3.6.1.2.1.11.15',
    'snmpInGetNexts' => '1.3.6.1.2.1.11.16',
    'snmpInSetRequests' => '1.3.6.1.2.1.11.17',
    'snmpInGetResponses' => '1.3.6.1.2.1.11.18',
    'snmpInTraps' => '1.3.6.1.2.1.11.19',
    'snmpOutPkts' => '1.3.6.1.2.1.11.2',
    'snmpOutTooBigs' => '1.3.6.1.2.1.11.20',
    'snmpOutNoSuchNames' => '1.3.6.1.2.1.11.21',
    'snmpOutBadValues' => '1.3.6.1.2.1.11.22',
    'snmpOutGenErrs' => '1.3.6.1.2.1.11.24',
    'snmpOutGetRequests' => '1.3.6.1.2.1.11.25',
    'snmpOutGetNexts' => '1.3.6.1.2.1.11.26',
    'snmpOutSetRequests' => '1.3.6.1.2.1.11.27',
    'snmpOutGetResponses' => '1.3.6.1.2.1.11.28',
    'snmpOutTraps' => '1.3.6.1.2.1.11.29',
    'snmpInBadVersions' => '1.3.6.1.2.1.11.3',
    'snmpEnableAuthenTraps' => '1.3.6.1.2.1.11.30',
    'snmpInBadCommunityNames' => '1.3.6.1.2.1.11.4',
    'snmpInBadCommunityUses' => '1.3.6.1.2.1.11.5',
    'snmpInASNParseErrs' => '1.3.6.1.2.1.11.6',
    'snmpInTooBigs' => '1.3.6.1.2.1.11.8',
    'snmpInNoSuchNames' => '1.3.6.1.2.1.11.9',
    'ifName' => '1.3.6.1.2.1.31.1.1.1.1',
    'ifInMulticastPkts' => '1.3.6.1.2.1.31.1.1.1.2',
    'ifInBroadcastPkts' => '1.3.6.1.2.1.31.1.1.1.3',
    'ifOutMulticastPkts' => '1.3.6.1.2.1.31.1.1.1.4',
    'ifOutBroadcastPkts' => '1.3.6.1.2.1.31.1.1.1.5',
    'ifHCInOctets' => '1.3.6.1.2.1.31.1.1.1.6',
    'ifHCInUcastPkts' => '1.3.6.1.2.1.31.1.1.1.7',
    'ifHCInMulticastPkts' => '1.3.6.1.2.1.31.1.1.1.8',
    'ifHCInBroadcastPkts' => '1.3.6.1.2.1.31.1.1.1.9',
    'ifHCOutOctets' => '1.3.6.1.2.1.31.1.1.1.10',
    'ifHCOutUcastPkts' => '1.3.6.1.2.1.31.1.1.1.11',
    'ifHCOutMulticastPkts' => '1.3.6.1.2.1.31.1.1.1.12',
    'ifHCOutBroadcastPkts' => '1.3.6.1.2.1.31.1.1.1.13',
    'ifLinkUpDownTrapEnable' => '1.3.6.1.2.1.31.1.1.1.14',
    'ifHighSpeed' => '1.3.6.1.2.1.31.1.1.1.15',
    'ifPromiscuousMode' => '1.3.6.1.2.1.31.1.1.1.16',
    'ifConnectorPresent' => '1.3.6.1.2.1.31.1.1.1.17',
    'ifAlias' => '1.3.6.1.2.1.31.1.1.1.18',
    'ifCounterDiscontinuityTime' => '1.3.6.1.2.1.31.1.1.1.19',
    'experimental' => '1.3.6.1.3',
    'private' => '1.3.6.1.4',
    'enterprises' => '1.3.6.1.4.1',
  );

# GIL
my %revOIDS = ();	# Reversed %SNMP_util::OIDS hash
my $RevNeeded = 1;

my $agent_start_time = time;

undef $SNMP_util::Host;
undef $SNMP_util::Session;
undef $SNMP_util::Version;
undef $SNMP_util::LHost;
undef $SNMP_util::IPv4only;
$SNMP_util::Debug = 0;
$SNMP_util::CacheFile = "OID_cache.txt";
$SNMP_util::CacheLoaded = 0;
$SNMP_util::Return_array_refs = 0;
$SNMP_util::Return_hash_refs = 0;

srand(time + $$);

### Prototypes
sub snmpget ($@);
sub snmpgetnext ($@);
sub snmpopen ($$$);
sub snmpwalk ($@);
sub snmpwalk_flg ($$@);
sub snmpset ($@);
sub snmptrap ($$$$$@);
sub snmpgetbulk ($$$@);
sub snmpmaptable ($$@);
sub snmpmaptable4 ($$$@);
sub snmpwalkhash ($$@);
sub toOID (@);
sub snmpmapOID (@);
sub snmpMIB_to_OID ($);
sub encode_oid_with_errmsg ($);
sub Check_OID ($);
sub snmpLoad_OID_Cache ($);
sub snmpQueue_MIB_File (@);
sub MIB_fill_OID ($);

sub version () { $VERSION; }

#
# Start an snmp session
#
sub snmpopen ($$$) {
  my($host, $type, $vars) = @_;
  my($nhost, $port, $community, $lhost, $lport, $nlhost);
  my($timeout, $retries, $backoff, $version);
  my $v4onlystr;

  $type = 0 if (!defined($type));
  $community = "public";
  $nlhost = "";

  ($community, $host) = ($1, $2) if ($host =~ /^(.*)@([^@]+)$/);

  # We can't split on the : character because a numeric IPv6
  # address contains a variable number of :'s
  my $opts;
 if( ($host =~ /^(\[.*\]):(.*)$/) or ($host =~ /^(\[.*\])$/) ) {
    # Numeric IPv6 address between []
    ($host, $opts) = ($1, $2);
  } else {
    # Hostname or numeric IPv4 address
    ($host, $opts) = split(':', $host, 2);
  }
  ($port, $timeout, $retries, $backoff, $version, $v4onlystr) = split(':', $opts, 6)
    if(defined($opts) and (length $opts > 0) );

  undef($version) if (defined($version) and length($version) <= 0);
  $v4onlystr = "" unless defined $v4onlystr;
  $version = '1' unless defined $version;
  if (defined($port) and ($port =~ /^([^!]*)!(.*)$/)) {
    ($port, $lhost) = ($1, $2);
    $nlhost = $lhost;
    ($lhost, $lport) = ($1, $2) if ($lhost =~ /^(.*)!(.*)$/);
    undef($lhost) if (defined($lhost) and (length($lhost) <= 0));
    undef($lport) if (defined($lport) and (length($lport) <= 0));
  }
  undef($port) if (defined($port) and length($port) <= 0);
  $port = 162 if ($type == 1 and !defined($port));
  $nhost = "$community\@$host";
  $nhost .= ":" . $port if (defined($port));

  if ((!defined($SNMP_util::Session))
    or ($SNMP_util::Host ne $nhost)
    or ($SNMP_util::Version ne $version)
    or ($SNMP_util::LHost ne $nlhost)
    or ($SNMP_util::IPv4only ne $v4onlystr)) {
    if (defined($SNMP_util::Session)) {
      $SNMP_util::Session->close();    
      undef $SNMP_util::Session;
      undef $SNMP_util::Host;
      undef $SNMP_util::Version;
      undef $SNMP_util::LHost;
      undef $SNMP_util::IPv4only;
    }
    $SNMP_util::Session = ($version =~ /^2c?$/i)
      ? SNMPv2c_Session->open($host, $community, $port, undef,
				$lport, undef, $lhost, ($v4onlystr eq 'v4only') ? 1:0 )
      : SNMP_Session->open($host, $community, $port, undef,
				$lport, undef, $lhost, ($v4onlystr eq 'v4only') ? 1:0 );
    ($SNMP_util::Host = $nhost, $SNMP_util::Version = $version,
      $SNMP_util::LHost = $nlhost, $SNMP_util::IPv4only = $v4onlystr) if defined($SNMP_util::Session);
  }

  if (defined($SNMP_util::Session)) {
    if (ref $vars->[0] eq 'HASH') {
      my $opts = shift @$vars;
      foreach $type (keys %$opts) {
	if ($type eq 'return_array_refs') {
	  $SNMP_util::Return_array_refs = $opts->{$type};
	} elsif ($type eq 'return_hash_refs') {
	  $SNMP_util::Return_hash_refs = $opts->{$type};
	} else {
	  if (exists $SNMP_util::Session->{$type}) {
	    if ($type eq 'timeout') {
	      $SNMP_util::Session->set_timeout($opts->{$type});
	    } elsif ($type eq 'retries') {
	      $SNMP_util::Session->set_retries($opts->{$type});
	    } elsif ($type eq 'backoff') {
	      $SNMP_util::Session->set_backoff($opts->{$type});
	    } else {
	      $SNMP_util::Session->{$type} = $opts->{$type};
	    }
	  } else {
	    carp "SNMPopen Unknown SNMP Option Key '$type'\n"
	      unless ($SNMP_Session::suppress_warnings > 1);
	  }
	}
      }
    }
    $SNMP_util::Session->set_timeout($timeout)
      if (defined($timeout) and (length($timeout) > 0));
    $SNMP_util::Session->set_retries($retries)
      if (defined($retries) and (length($retries) > 0));
    $SNMP_util::Session->set_backoff($backoff)
      if (defined($backoff) and (length($backoff) > 0));
  }
  return $SNMP_util::Session;
}


#
# A restricted snmpget.
#
sub snmpget ($@) {
  my($host, @vars) = @_;
  my(@enoid, $var, $response, $bindings, $binding, $value, $oid, @retvals);
  my $session;

  @retvals = ();
  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPGET Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return wantarray ? @retvals : undef;
  }

  @enoid = &toOID(@vars);
  if ($#enoid < 0) {
    return wantarray ? @retvals : undef;
  }

  if ($session->get_request_response(@enoid)) {
    $response = $session->pdu_buffer;
    ($bindings) = $session->decode_get_response($response);
    while ($bindings) {
      ($binding, $bindings) = decode_sequence($bindings);
      ($oid, $value) = decode_by_template($binding, "%O%@");
      my $tempo = pretty_print($value);
      push @retvals, $tempo;
    }
    return wantarray ? @retvals : $retvals[0];
  }
  $var = join(' ', @vars);
  carp "SNMPGET Problem for $var on $host\n"
    unless ($SNMP_Session::suppress_warnings > 1);
  return wantarray ? @retvals : undef;
}

#
# A restricted snmpgetnext.
#
sub snmpgetnext ($@) {
  my($host, @vars) = @_;
  my(@enoid, $var, $response, $bindings, $binding);
  my($value, $upoid, $oid, @retvals);
  my($noid);
  my $session;

  @retvals = ();
  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPGETNEXT Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return wantarray ? @retvals : undef;
  }

  @enoid = &toOID(@vars);
  if ($#enoid < 0) {
    return wantarray ? @retvals : undef;
  }

  undef @vars;
  undef @retvals;
  foreach $noid (@enoid) {
    $upoid = pretty_print($noid);
    push(@vars, $upoid);
  }
  if ($session->getnext_request_response(@enoid)) {
    $response = $session->pdu_buffer;
    ($bindings) = $session->decode_get_response($response);
    while ($bindings) {
      ($binding, $bindings) = decode_sequence($bindings);
      ($oid, $value) = decode_by_template($binding, "%O%@");
      my $tempo = pretty_print($oid);
      my $tempv = pretty_print($value);
      push @retvals, "$tempo:$tempv";
    }
    return wantarray ? @retvals : $retvals[0];
  } else {
    $var = join(' ', @vars);
    carp "SNMPGETNEXT Problem for $var on $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return wantarray ? @retvals : undef;
  }
}

#
# A restricted snmpwalk.
#
sub snmpwalk ($@) {
  my($host, @vars) = @_;
  return(&snmpwalk_flg($host, undef, @vars));
}

#
# Walk the MIB, putting everything you find into hashes.
#
sub snmpwalkhash($$@) {
#  my($host, $hash_sub, @vars) = @_;
  return(&snmpwalk_flg( @_ ));
}

sub snmpwalk_flg ($$@) {
  my($host, $hash_sub, @vars) = @_;
  my(@enoid, $var, $response, $bindings, $binding);
  my($value, $upoid, $oid, @retvals, @retvaltmprefs);
  my($got, @nnoid, $noid, $ok, $ix, @avars);
  my $session;
  my(%soid);
  my(%done, %rethash, $h_ref);

  $h_ref = (ref $vars[$#vars] eq "HASH") ? pop(@vars) : \%rethash;

  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPWALK Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    if (defined($hash_sub)) {
      return ($h_ref) if ($SNMP_util::Return_hash_refs);
      return (%$h_ref);
    } else {
      @retvals = ();
      return (@retvals);
    }
  }

  @enoid = toOID(@vars);
  if ($#enoid < 0) {
    if (defined($hash_sub)) {
      return ($h_ref) if ($SNMP_util::Return_hash_refs);
      return (%$h_ref);
    } else {
      @retvals = ();
      return (@retvals);
    }
  }

  # GIL
  #
  # Create/Refresh a reversed hash with oid -> name
  #
  if (defined($hash_sub) and ($RevNeeded)) {
      %revOIDS = reverse %SNMP_util::OIDS;
      $RevNeeded = 0;
  }

  $got = 0;
  @nnoid = @enoid;
  undef @vars;
  foreach $noid (@enoid) {
    $upoid = pretty_print($noid);
    push(@vars, $upoid);
  }

  # @vars is the original set of walked variables.
  # @avars is the current set of walked variables as the
  # walk goes on.
  # @vars stays static while @avars may shrink as we reach end
  # of walk for individual variables during PDU exchange.
   
  @avars = @vars;

  # IlvJa
  #
  # Create temporary array of refs to return vals.

  if ($SNMP_util::Return_array_refs) {
    for($ix = 0;$ix < scalar @vars; $ix++) {
      my $tmparray = [];
      $retvaltmprefs[$ix] = $tmparray;
      $retvals[$ix] = $tmparray;
    }
  }


  while(($SNMP_util::Version ne '1' and $session->{'use_getbulk'})
    ? $session->getbulk_request_response(0,
					  $session->default_max_repetitions(),
					  @nnoid)
    : $session->getnext_request_response(@nnoid))
  {
    $got = 1;
    $response = $session->pdu_buffer;
    ($bindings) = $session->decode_get_response($response);
    $ix = 0;
    while ($bindings) {
      ($binding, $bindings) = decode_sequence($bindings);
      unless ($nnoid[$ix]) { # IlvJa
	$ix = ++$ix % (scalar @avars);
	next;
      }
      ($oid, $value) = decode_by_template($binding, "%O%@");
      $ok = 0;
      my $tempo = pretty_print($oid);
      $noid = $avars[$ix];  # IlvJa
      if ($tempo =~ /^$noid\./ or $tempo eq $noid ) {
	$ok = 1;
	$upoid = $noid;
      } else {
	# IlvJa
	#
	# The walk for variable $vars[$ix] has been finished as
	# $nnoid[$ix] no longer is in the $avar[$ix] OID tree.
	# So we exclude this variable from further requests.

	$avars[$ix] = "";
	$nnoid[$ix] = "";
	$retvaltmprefs[$ix] = undef if $SNMP_util::Return_array_refs;
      }
      if ($ok) {
	my $tmp = encode_oid_with_errmsg ($tempo);
	if (!defined $tmp) {
	  if (defined($hash_sub)) {
	    return ($h_ref) if ($SNMP_util::Return_hash_refs);
	    return (%$h_ref);
	  } else {
	    @retvals = ();
	    return (@retvals);
	  }
	}
	if (exists($done{$tmp})) {	# GIL, Ilvja
	  #
	  # We've detected a loop for $nnoid[$ix], so mark it as finished.
	  # Exclude this variable from further requests.
	  #
	  $avars[$ix] = "";
	  $nnoid[$ix] = "";
	  $retvaltmprefs[$ix] = undef if $SNMP_util::Return_array_refs;
	  next;
	}
	$nnoid[$ix] = $tmp;   # Keep on walking. (IlvJa)
	my $tempv = pretty_print($value);
	if (defined($hash_sub)) {
	  #
	  # extract name of the oid, if possible, the rest becomes the instance
	  #
	  my $inst = "";
	  my $upo = $upoid;
	  while (!exists($revOIDS{$upo}) and length($upo)) {
	    $upo =~ s/(\.\d+?)$//;
	    if (defined($1) and length($1)) {
	      $inst = $1 . $inst;
	    } else {
	      $upo = "";
	      last;
	    }
	  }	
	  if (length($upo) and exists($revOIDS{$upo})) {
	    $upo = $revOIDS{$upo} . $inst;
	  } else {
	    $upo = $upoid;
	  }

	  $inst = "";
	  while (!exists($revOIDS{$tempo}) and length($tempo)) {
	    $tempo =~ s/(\.\d+?)$//;
	    if (defined($1) and length($1)) {
	      $inst = $1 . $inst;
	    } else {
	      $tempo = "";
	      last;
	    }
	  }	
	  if (length($tempo) and exists($revOIDS{$tempo})) {
	    $var = $revOIDS{$tempo};
	  } else {
	    $var = pretty_print($oid);
	  }
	  #
	  # call hash_sub
	  #
	  &$hash_sub($h_ref, $host, $var, $tempo, $inst,
			$tempv, $upo);
	} else {
	  if ($SNMP_util::Return_array_refs) {
	    $tempo=~s/^$upoid\.//;
	    push @{$retvaltmprefs[$ix]}, "$tempo:$tempv";
	  } else {
	    $tempo=~s/^$upoid\.// if ($#enoid <= 0);
	    push @retvals, "$tempo:$tempv";
	  }
	}
	$done{$tmp} = 1;	# GIL
      }
      $ix = ++$ix % (scalar @avars);
    }

    # Ok, @nnoid should contain the remaining variables for the
    # next request.  Some or all entries in @nnoid might be the empty
    # string.  If the nth element in @nnoid is "" that means that
    # the walk related to the nth variable in the last request has been
    # completed and we should not include that var in subsequent reqs.

    # Clean up both @nnoid and @avars so "" elements are removed.
    @nnoid = grep (($_), @nnoid);
    @avars = grep (($_), @avars);
    @retvaltmprefs = grep (($_), @retvaltmprefs);

    last if ($#nnoid < 0);   # @nnoid empty means we are done walking.
  }
  if (!$got) {
    $var = join(' ', @vars);
    carp "SNMPWALK Problem for $var on $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    @retvals = ();
  }
  if (defined($hash_sub)) {
      return ($h_ref) if ($SNMP_util::Return_hash_refs);
      return (%$h_ref);
  } else {
      return (@retvals);
  }
}

#
# A restricted snmpset.
#
sub snmpset($@) {
  my($host, @vars) = @_;
  my(@enoid, $response, $bindings, $binding);
  my($oid, @retvals, $type, $value, $val);
  my $session;

  @retvals = ();
  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPSET Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return wantarray ? @retvals : undef;
  }

  while(@vars) {
    ($oid) = toOID((shift @vars));
    $type  = shift @vars;
    $value = shift @vars;
    $type =~ tr/A-Z/a-z/;
    if ($type eq "int") {
      $val = encode_int($value);
    } elsif ($type eq "integer") {
      $val = encode_int($value);
    } elsif ($type eq "string") {
      $val = encode_string($value);
    } elsif ($type eq "octetstring") {
      $val = encode_string($value);
    } elsif ($type eq "octet string") {
      $val = encode_string($value);
    } elsif ($type eq "oid") {
      $val = encode_oid_with_errmsg($value);
    } elsif ($type eq "object id") {
      $val = encode_oid_with_errmsg($value);
    } elsif ($type eq "object identifier") {
      $val = encode_oid_with_errmsg($value);
    } elsif ($type eq "ipaddr") {
      $val = encode_ip_address($value);
    } elsif ($type eq "ip address") {
      $val = encode_ip_address($value);
    } elsif ($type eq "timeticks") {
      $val = encode_timeticks($value);
    } elsif ($type eq "uint") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "uinteger") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "uinteger32") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "unsigned int") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "unsigned integer") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "unsigned integer32") {
      $val = encode_uinteger32($value);
    } elsif ($type eq "counter") {
      $val = encode_counter32($value);
    } elsif ($type eq "counter32") {
      $val = encode_counter32($value);
    } elsif ($type eq "counter64") {
      $val = encode_counter64($value);
    } elsif ($type eq "gauge") {
      $val = encode_gauge32($value);
    } elsif ($type eq "gauge32") {
      $val = encode_gauge32($value);
    } else {
      carp "unknown SNMP type: $type\n"
	unless ($SNMP_Session::suppress_warnings > 1);
      return wantarray ? @retvals : undef;
    }
    if (!defined($val)) {
      carp "SNMP type $type value $value didn't encode properly\n"
	unless ($SNMP_Session::suppress_warnings > 1);
      return wantarray ? @retvals : undef;
    }
    push @enoid, [$oid,$val];
  }
  if ($#enoid < 0) {
    return wantarray ? @retvals : undef;
  }
  if ($session->set_request_response(@enoid)) {
    $response = $session->pdu_buffer;
    ($bindings) = $session->decode_get_response($response);
    while ($bindings) {
      ($binding, $bindings) = decode_sequence($bindings);
      ($oid, $value) = decode_by_template($binding, "%O%@");
      my $tempo = pretty_print($value);
      push @retvals, $tempo;
    }
    return wantarray ? @retvals : $retvals[0];
  }
  return wantarray ? @retvals : undef;
}

#
# Send an SNMP trap
#
sub snmptrap($$$$$@) {
  my($host, $ent, $agent, $gen, $spec, @vars) = @_;
  my($oid, @retvals, $type, $value);
  my(@enoid);
  my $session;

  $session = &snmpopen($host, 1, \@vars);
  if (!defined($session)) {
    carp "SNMPTRAP Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return undef;
  }

  if ($agent =~ /^\d+\.\d+\.\d+\.\d+(.*)/ ) {
    $agent = pack("C*", split /\./, $agent);
  } else {
    $agent = inet_aton($agent);
  }
  push @enoid, toOID(($ent));
  push @enoid, encode_ip_address($agent);
  push @enoid, encode_int($gen);
  push @enoid, encode_int($spec);
  push @enoid, encode_timeticks((time-$agent_start_time) * 100);
  while(@vars) {
    ($oid) = toOID((shift @vars));
    $type  = shift @vars;
    $value = shift @vars;
    if ($type =~ /string/i) {
      $value = encode_string($value);
      push @enoid, [$oid,$value];
    } elsif ($type =~ /ipaddr/i) {
      $value = encode_ip_address($value);
      push @enoid, [$oid,$value];
    } elsif ($type =~ /int/i) {
      $value = encode_int($value);
      push @enoid, [$oid,$value];
    } elsif ($type =~ /oid/i) {
      my $tmp = encode_oid_with_errmsg($value);
      return undef unless defined $tmp;
      push @enoid, [$oid,$tmp];
    } else {
      carp "unknown SNMP type: $type\n"
	unless ($SNMP_Session::suppress_warnings > 1);
      return undef;
    }
  }
  return($session->trap_request_send(@enoid));
}

#
# A restricted snmpgetbulk.
#
sub snmpgetbulk ($$$@) {
  my($host, $nr, $mr, @vars) = @_;
  my(@enoid, $var, $response, $bindings, $binding);
  my($value, $upoid, $oid, @retvals);
  my($noid);
  my $session;

  @retvals = ();
  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPGETBULK Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return @retvals;
  }

  @enoid = &toOID(@vars);
  return @retvals if ($#enoid < 0);

  undef @vars;
  foreach $noid (@enoid) {
    $upoid = pretty_print($noid);
    push(@vars, $upoid);
  }
  if ($session->getbulk_request_response($nr, $mr, @enoid)) {
    $response = $session->pdu_buffer;
    ($bindings) = $session->decode_get_response($response);
    while ($bindings) {
      ($binding, $bindings) = decode_sequence($bindings);
      ($oid, $value) = decode_by_template($binding, "%O%@");
      my $tempo = pretty_print($oid);
      my $tempv = pretty_print($value);
      push @retvals, "$tempo:$tempv";
    }
    return @retvals;
  } else {
    $var = join(' ', @vars);
    carp "SNMPGETBULK Problem for $var on $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return @retvals;
  }
}

#
# walk a table, calling a user-supplied function for each
# column of a table.
#
sub snmpmaptable($$@) {
  my($host, $fun, @vars) = @_;
  return snmpmaptable4($host, $fun, 0, @vars);
}

sub snmpmaptable4($$$@) {
  my($host, $fun, $max_reps, @vars) = @_;
  my(@enoid, $var, $session);

  $session = &snmpopen($host, 0, \@vars);
  if (!defined($session)) {
    carp "SNMPMAPTABLE Problem for $host\n"
      unless ($SNMP_Session::suppress_warnings > 1);
    return undef;
  }

  foreach $var (toOID(@vars)) {
    push(@enoid, [split('\.', pretty_print($var))]);
  }

  $max_reps = $session->default_max_repetitions() if ($max_reps <= 0);

  return $session->map_table_start_end( [@enoid],
					sub() {
					  my ($ind, @vals) = @_;
					  my (@pvals, $val);

					  foreach $val (@vals) {
					    push(@pvals, pretty_print($val));
					  }
					  &$fun($ind, @pvals);
					},
					"", undef, $max_reps);
}


#
#  Given an OID in either ASN.1 or mixed text/ASN.1 notation, return an
#  encoded OID.
#
sub toOID(@) {
  my(@vars) = @_;
  my($oid, $var, $tmp, $tmpv, @retvar);

  undef @retvar;
  foreach $var (@vars) {
    ($oid, $tmp) = &Check_OID($var);
    if (!$oid and $SNMP_util::CacheLoaded == 0) {
      $tmp = $SNMP_Session::suppress_warnings;
      $SNMP_Session::suppress_warnings = 1000;

      &snmpLoad_OID_Cache($SNMP_util::CacheFile);

      $SNMP_util::CacheLoaded = 1;
      $SNMP_Session::suppress_warnings = $tmp;

      ($oid, $tmp) = &Check_OID($var);
    }
    while (!$oid and $#SNMP_util::MIB_Files >= 0) {
      $tmp = $SNMP_Session::suppress_warnings;
      $SNMP_Session::suppress_warnings = 1000;

      snmpMIB_to_OID(shift(@SNMP_util::MIB_Files));

      $SNMP_Session::suppress_warnings = $tmp;

      ($oid, $tmp) = &Check_OID($var);
      if ($oid) {
	open(CACHE, ">>$SNMP_util::CacheFile");
	print CACHE "$tmp\t$oid\n";
	close(CACHE);
      }
    }
    if ($oid) {
      $var =~ s/^$tmp/$oid/;
    } else {
      carp "Unknown SNMP var $var\n"
      unless ($SNMP_Session::suppress_warnings > 1);
      next;
    }
    while ($var =~ /\"([^\"]*)\"/) {
      $tmp = sprintf("%d.%s", length($1), join(".", map(ord, split(//, $1))));
      $var =~ s/\"$1\"/$tmp/;
    }
    print "toOID: $var\n" if $SNMP_util::Debug;
    $tmp = encode_oid_with_errmsg($var);
    if (!defined($tmp)) {
      my @empty = ();
      return @empty;
    }
    push(@retvar, $tmp);
  }
  return @retvar;
}

#
#  Add passed-in text, OID pairs to the OID mapping table.
#
sub snmpmapOID(@)
{
  my(@vars) = @_;
  my($oid, $txt);

  while($#vars >= 0) {
    $txt = shift @vars;
    $oid = shift @vars;

    next unless($txt =~ /^[a-zA-Z][\w\-]*(\.[a-zA-Z][\w\-])*$/);
    next unless($oid =~ /^\d+(\.\d+)*$/);

    $SNMP_util::OIDS{$txt} = $oid;
    $RevNeeded = 1;
    print "snmpmapOID: $txt => $oid\n" if $SNMP_util::Debug;
  }
  
  return undef;
}

#
# Open the passed-in file name and read it in to populate
# the cache of text-to-OID map table.  It expects lines
# with two fields, the first the textual string like "ifInOctets",
# and the second the OID value, like "1.3.6.1.2.1.2.2.1.10".
#
# blank lines and anything after a '#' or between '--' is ignored.
#
sub snmpLoad_OID_Cache ($) {
  my($arg) = @_;
  my($txt, $oid);

  if (!open(CACHE, $arg)) {
    carp "snmpLoad_OID_Cache: Can't open $arg: $!"
      unless ($SNMP_Session::suppress_warnings > 1);
    return -1;
  }

  while(<CACHE>) {
    s/#.*//;				# '#' starts a comment
    s/--.*?--/ /g;			# comment delimited by '--', like MIBs
    s/--.*//;				# comment started by '--'
    next if (/^$/);
    next unless (/\s/);			# must have whitespace as separator
    chomp;
    ($txt, $oid) = split(' ', $_, 2);
    $txt = $1 if ($txt =~ /^[\'\"](.*)[\'\"]/);
    $oid = $1 if ($oid =~ /^[\'\"](.*)[\'\"]/);
    if (($txt =~ /^\.?\d+(\.\d+)*\.?$/)
    and  ($oid !~ /^\.?\d+(\.\d+)*\.?$/)) {
	my($a) = $oid;
	$oid = $txt;
	$txt = $a;
    }
    $oid =~ s/^\.//;
    $oid =~ s/\.$//;
    &snmpmapOID($txt, $oid);
  }
  close(CACHE);
  return 0;
}

#
# Check to see if an OID is in the text-to-OID cache.
# Returns the OID and the corresponding text as two separate
# elements.
#
sub Check_OID ($) {
  my($var) = @_;
  my($tmp, $tmpv, $oid);

  if ($var =~ /^[a-zA-Z][\w\-]*(\.[a-zA-Z][\w\-]*)*/)
  {
    $tmp = $&;
    $tmpv = $tmp;
    for (;;) {
      last if exists($SNMP_util::OIDS{$tmpv});
      last if !($tmpv =~ s/^[^\.]*\.//);
    }
    $oid = $SNMP_util::OIDS{$tmpv};
    if ($oid) {
      return ($oid, $tmp);
    } else {
      my @empty = ();
      return @empty;
    }
  }
  return ($var, $var);
}

#
# Save the passed-in list of MIB files until an OID can't be
# found in the existing table.  At that time the MIB file will
# be loaded, and the lookup attempted again.
#
sub snmpQueue_MIB_File (@) {
  my(@files) = @_;
  my($file);

  foreach $file (@files) {
    push(@SNMP_util::MIB_Files, $file);
  }
}

#
# Read in the passed MIB file, parsing it
# for their text-to-OID mappings
#
sub snmpMIB_to_OID ($) {
  my($arg) = @_;
  my($cnt, $quote, $buf, %tOIDs, $tgot);
  my($var, @parts, $strt, $indx, $ind, $val);

  if (!open(MIB, $arg)) {
    carp "snmpMIB_to_OID: Can't open $arg: $!"
      unless ($SNMP_Session::suppress_warnings > 1);
    return -1;
  }
  print "snmpMIB_to_OID: loading $arg\n" if $SNMP_util::Debug;
  $cnt = 0;
  $quote = 0;
  $tgot = 0;
  $buf = '';
  while(<MIB>) {
    if ($quote) {
      next unless /"/;
      $quote = 0;
    }
    chomp;
    $buf .= ' ' . $_;

    $buf =~ s/"[^"]*"//g;	# throw away quoted strings
    $buf =~ s/--.*?--/ /g;	# throw away comments (-- anything --)
    $buf =~ s/--.*//;		# throw away comments (-- anything to EOL)
    $buf =~ s/\s+/ /g;		# clean up multiple spaces

    if ($buf =~ /"/) {		# look for quoted string
      $quote = 1;
      next;
    }

    if ($buf =~ /DEFINITIONS *::= *BEGIN/) {
	$cnt += MIB_fill_OID(\%tOIDs) if ($tgot);
	$buf = '';
	%tOIDs = ();
	$tgot = 0;
	next;
    }
    $buf =~ s/OBJECT-TYPE/OBJECT IDENTIFIER/;
    $buf =~ s/OBJECT-IDENTITY/OBJECT IDENTIFIER/;
    $buf =~ s/OBJECT-GROUP/OBJECT IDENTIFIER/;
    $buf =~ s/MODULE-IDENTITY/OBJECT IDENTIFIER/;
    $buf =~ s/NOTIFICATION-TYPE/OBJECT IDENTIFIER/;
    $buf =~ s/ IMPORTS .*\;//;
    $buf =~ s/ SEQUENCE *{.*}//;
    $buf =~ s/ SYNTAX .*//;
    $buf =~ s/ [\w\-]+ *::= *OBJECT IDENTIFIER//;
    $buf =~ s/ OBJECT IDENTIFIER.*::= *{/ OBJECT IDENTIFIER ::= {/;

    if ($buf =~ / ([\w\-]+) OBJECT IDENTIFIER *::= *{([^}]+)}/) {
      $var = $1;
      $buf = $2;
      $buf =~ s/ +$//;
      $buf =~ s/\s+\(/\(/g;	# remove spacing around '('
      $buf =~ s/\(\s+/\(/g;
      $buf =~ s/\s+\)/\)/g;	# remove spacing before ')'
      @parts = split(' ', $buf);
      $strt = '';
      foreach $indx (@parts) {
	if ($indx =~ /([\w\-]+)\((\d+)\)/) {
	  $ind = $1;
	  $val = $2;
	  if (exists($tOIDs{$strt})) {
	    $tOIDs{$ind} = $tOIDs{$strt} . '.' . $val;
	  } elsif ($strt ne '') {
	    $tOIDs{$ind} = "${strt}.${val}";
	  } else {
	    $tOIDs{$ind} = $val;
	  }
	  $strt = $ind;
	  $tgot = 1;
	} elsif ($indx =~ /^\d+$/) {
	  if (exists($tOIDs{$strt})) {
	    $tOIDs{$var} = $tOIDs{$strt} . '.' . $indx;
	  } else {
	    $tOIDs{$var} = "${strt}.${indx}";
	  }
	  $tgot = 1;
	} else {
	  $strt = $indx;
	}
      }
      $buf = '';
    }
  }
  $cnt += MIB_fill_OID(\%tOIDs) if ($tgot);
  $RevNeeded = 1 if ($cnt > 0);
  return $cnt;
}

#
# Fill the OIDS hash with results from the MIB parsing
#
sub MIB_fill_OID ($)
{
  my($href) = @_;
  my($cnt, $changed, @del, $var, $val, @parts, $indx);
  my(%seen);

  $cnt = 0;
  do {
    $changed = 0;
    @del = ();
    foreach $var (keys %$href) {
      $val = $href->{$var};
      @parts = split('\.', $val);
      $val = '';
      foreach $indx (@parts) {
	if ($indx =~ /^\d+$/) {
	  $val .= '.' . $indx;
	} else {
	  if (exists($SNMP_util::OIDS{$indx})) {
	    $val = $SNMP_util::OIDS{$indx};
	  } else {
	    $val .= '.' . $indx;
	  }
	}
      }
      if ($val =~ /^[\d\.]+$/) {
	$val =~ s/^\.+//;
	if (!exists($SNMP_util::OIDS{$var})
	|| (length($val) > length($SNMP_util::OIDS{$var}))) {
	  $SNMP_util::OIDS{$var} = $val;
	  print "'$var' => '$val'\n" if $SNMP_util::Debug;
	  $changed = 1;
	  $cnt++;
	}
	push @del, $var;
      }
    }
    foreach $var (@del) {
      delete $href->{$var};
    }
  } while($changed);

  $Carp::CarpLevel++;
  foreach $var (sort keys %$href) {
    $val = $href->{$var};
    $val =~ s/\..*//;
    next if (exists($seen{$val}));
    $seen{$val} = 1;
    $seen{$var} = 1;
    carp "snmpMIB_to_OID: prefix \"$val\" unknown, load the parent MIB first.\n"
      unless ($SNMP_Session::suppress_warnings > 1);
  }
  $Carp::CarpLevel--;
  return $cnt;
}


sub encode_oid_with_errmsg ($) {
  my ($oid) = @_;
  my $tmp = encode_oid(split(/\./, $oid));
  if (! defined $tmp) {
    carp "cannot encode Object ID $oid: $BER::errmsg"
      unless ($SNMP_Session::suppress_warnings > 1);
    return undef;
  }
  return $tmp;
}

1;