Net::sFlow - decode sFlow datagrams.
use Net::sFlow; use IO::Socket::INET; my $sock = IO::Socket::INET->new( LocalPort => '6343', Proto => 'udp') or die "Can't bind : $@\n"; while ($sock->recv($packet,1548)) { &processPacket($packet); } die "Socket recv: $!"; sub processPacket { my $sFlowPacket = shift; my ($sFlowDatagramRef, $sFlowSamplesRef, $errorsRef) = Net::sFlow::decode($sFlowPacket); # print errors foreach my $error (@{$errorsRef}) { warn "$error"; } # print sflow data print "===Datagram===\n"; print "sFlow version: $sFlowDatagramRef->{sFlowVersion}\n"; print "datagram sequence number: $sFlowDatagramRef->{datagramSequenceNumber}\n"; foreach my $sFlowSample (@{$printSamplesRef}) { print "\n"; print "---Sample---\n"; print "sample sequence number: $sFlowSample->{sampleSequenceNumber}\n"; } }
The sFlow module provides a mechanism to parse and decode sFlow datagrams. It supports sFlow version 2/4 (RFC 3176 - http://www.ietf.org/rfc/rfc3176.txt) and sFlow version 5 (Memo - http://sflow.org/sflow_version_5.txt).
The module's functionality is provided by a single (exportable) function, decode().
($datagram, $samples, $error) = Net::sFlow::decode($udp_data);
Returns a HASH reference containing the datagram data, an ARRAY reference with the sample data (each array element contains a HASH reference for one sample) and in case of an error a reference to an ARRAY containing the error messages.
A HASH reference containing information about the sFlow datagram, with the following keys:
sFlowVersion AgentIpVersion AgentIp datagramSequenceNumber agentUptime samplesInPacket
In the case of sFlow v5, there is an additional key:
subAgentId
Reference to a list of HASH references, each one representing one sample. Depending on the type, the hash contains the following additional keys:
In case of sFlow <= 4:
sampleType sampleSequenceNumber sourceIdType sourceIdIndex
If it's a sFlow <= 4 flowsample you will get the following additional keys:
samplingRate samplePool drops inputInterface outputInterface packetDataType extendedDataInSample
If it's a sFlow <= 4 countersample you will get these additional keys:
counterSamplingInterval countersVersion
In case of sFlow >= 5 you will first get enterprise, format and length information:
sampleTypeEnterprise sampleTypeFormat sampleLength
In case of a flowsample (enterprise == 0 and format == 1):
sampleSequenceNumber sourceIdType sourceIdIndex samplingRate samplePool drops inputInterface outputInterface flowRecordsCount
If it's an expanded flowsample (enterprise == 0 and format == 3) you will get these additional keys instead of inputInterface and outputInterface:
inputInterfaceFormat inputInterfaceValue outputInterfaceFormat outputInterfaceValue
In case of a countersample (enterprise == 0 and format == 2) or an expanded countersample (enterprise == 0 and format == 4):
sampleSequenceNumber sourceIdType sourceIdIndex counterRecordsCount counterDataLength
Depending on what kind of samples the hardware is taking you will get the following additional keys:
Header data (sFlow format):
HEADERDATA HeaderProtocol HeaderFrameLength HeaderStrippedLength HeaderSizeByte HeaderSizeBit HeaderBin
Additional Header data decoded from the raw packet header:
HeaderEtherSrcMac HeaderEtherDestMac HeaderVer (IPv4 == 4, IPv6 == 6, ARP == 1, OTHER == 0) HeaderDatalen (of the whole packet including ethernet header)
Ethernet frame data:
ETHERNETFRAMEDATA EtherMacPacketlength EtherSrcMac EtherDestMac EtherPackettype
IPv4 data:
IPv4DATA IPv4Packetlength IPv4NextHeaderProtocol IPv4srcIp IPv4destIp IPv4srcPort IPv4destPort IPv4tcpFlags IPv4tos
IPv6 data:
IPv6DATA IPv6Packetlength IPv6NextHeaderProto IPv6srcIp IPv6destIp IPv6srcPort IPv6destPort IPv6tcpFlags IPv6Priority
Switch data:
SWITCHDATA SwitchSrcVlan SwitchSrcPriority SwitchDestVlan SwitchDestPriority
Router data:
ROUTERDATA RouterIpVersionNextHopRouter RouterIpAddressNextHopRouter RouterSrcMask RouterDestMask
Gateway data:
GATEWAYDATA GatewayIpVersionNextHopRouter (only in case of sFlow v5) GatewayIpAddressNextHopRouter (only in case of sFlow v5) GatewayAsRouter GatewayAsSource GatewayAsSourcePeer GatewayDestAsPathsCount GatewayDestAsPaths (arrayreference) each enty contains a hashreference: asPathSegmentType lengthAsList AsPath (arrayreference, asNumbers as entries) GatewayLengthCommunitiesList (added in sFlow v4) GatewayCommunities (arrayreference, added in sFlow v4) each enty contains a community (added in sFlow v4) localPref
User data:
USERDATA UserSrcCharset (only in case of sFlow v5) UserLengthSrcString UserSrcString UserDestCharset (only in case of sFlow v5) UserLengthDestString UserDestString
Url data (added in sFlow v3):
URLDATA UrlDirection UrlLength Url UrlHostLength (only in case of sFlow v5) UrlHost (only in case of sFlow v5)
The following keys can be only available in sFlow v5:
Mpls data:
MPLSDATA MplsIpVersionNextHopRouter MplsIpAddressNextHopRouter MplsInLabelStackCount MplsInLabelStack (arrayreference containing MplsInLabels) MplsOutLabelStackCount MplsOutLabelStack (arrayreference containing MplsOutLabels)
Nat data:
NATDATA NatIpVersionSrcAddress NatSrcAddress NatIpVersionDestAddress NatDestAddress
Mpls tunnel:
MPLSTUNNEL MplsTunnelLength MplsTunnelName MplsTunnelId MplsTunnelCosValue
Mpls vc:
MPLSVC MplsVcInstanceNameLength MplsVcInstanceName MplsVcId MplsVcLabelCosValue
Mpls fec:
MPLSFEC MplsFtnDescrLength MplsFtnDescr MplsFtnMask
Mpls lpv fec:
MPLSLPVFEC MplsFecAddrPrefixLength
Vlan tunnel:
VLANTUNNEL VlanTunnelLayerStackCount VlanTunnelLayerStack (arrayreference containing VlanTunnelLayer entries)
The following keys are also available in sFlow < 5:
Counter generic:
COUNTERGENERIC ifIndex ifType ifSpeed ifDirection ifAdminStatus ifOperStatus idInOctets ifInUcastPkts ifInMulticastPkts ifInBroadcastPkts idInDiscards ifInErrors ifInUnknownProtos ifOutOctets ifOutUcastPkts ifOutMulticastPkts ifOutBroadcastPkts ifOutDiscards ifOutErrors ifPromiscuousMode
Counter ethernet:
COUNTERETHERNET dot3StatsAlignmentErrors dot3StatsFCSErrors dot3StatsSingleCollisionFrames dot3StatsMultipleCollisionFrames dot3StatsSQETestErrors dot3StatsDeferredTransmissions dot3StatsLateCollisions dot3StatsExcessiveCollisions dot3StatsInternalMacTransmitErrors dot3StatsCarrierSenseErrors dot3StatsFrameTooLongs dot3StatsInternalMacReceiveErrors dot3StatsSymbolErrors
Counter tokenring:
COUNTERTOKENRING dot5StatsLineErrors dot5StatsBurstErrors dot5StatsACErrors dot5StatsAbortTransErrors dot5StatsInternalErrors dot5StatsLostFrameErrors dot5StatsReceiveCongestions dot5StatsFrameCopiedErrors dot5StatsTokenErrors dot5StatsSoftErrors dot5StatsHardErrors dot5StatsSignalLoss dot5StatsTransmitBeacons dot5StatsRecoverys dot5StatsLobeWires dot5StatsRemoves dot5StatsSingles dot5StatsFreqErrors
Counter vg:
COUNTERVG dot12InHighPriorityFrames dot12InHighPriorityOctets dot12InNormPriorityFrames dot12InNormPriorityOctets dot12InIPMErrors dot12InOversizeFrameErrors dot12InDataErrors dot12InNullAddressedFrames dot12OutHighPriorityFrames dot12OutHighPriorityOctets dot12TransitionIntoTrainings dot12HCInHighPriorityOctets dot12HCInNormPriorityOctets dot12HCOutHighPriorityOctets
Counter vlan:
COUNTERVLAN vlan_id octets ucastPkts multicastPkts broadcastPkts discards
Counter processor (only in sFlow v5):
COUNTERPROCESSOR cpu5s cpu1m cpu5m memoryTotal memoryFree
Reference to a list of error messages.
The decode function will blindly attempt to decode the data you provide. There are some tests for the appropriate values at various places (where it is feasible to test - like enterprises, formats, versionnumbers, etc.), but in general the GIGO principle still stands: Garbage In / Garbage Out.
sFlow v4 http://www.ietf.org/rfc/rfc3176.txt
Format Diagram v4: http://jasinska.de/sFlow/sFlowV4FormatDiagram/
sFlow v5 http://sflow.org/sflow_version_5.txt
Format Diagram v5: http://jasinska.de/sFlow/sFlowV5FormatDiagram/
Math::BigInt
Elisa Jasinska <elisa.jasinska@ams-ix.net>
Please send comments or bug reports to <sflow@ams-ix.net>
Copyright (c) 2006 AMS-IX B.V.
This package is free software and is provided "as is" without express or implied warranty. It may be used, redistributed and/or modified under the terms of the Perl Artistic License (see http://www.perl.com/perl/misc/Artistic.html)
To install Net::sFlow, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Net::sFlow
CPAN shell
perl -MCPAN -e shell install Net::sFlow
For more information on module installation, please visit the detailed CPAN module installation guide.