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stream.go
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package nfdump
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"github.com/rasky/go-lzo"
)
// NFStream keeps track of non record fields while stream processing file
type NFStream struct {
Header NFHeader
StatRecord NFStatRecord
r io.Reader
blockHeader NFBlockHeader
blockIndex int
blockRecordCount int
blockData []byte
decompressedBlock []byte
readNewBlock bool
recordHeader NFRecordHeader
start int
extMap map[uint16][]uint16
Exporters map[uint16]NFExporterInfoRecord
ExporterStats map[uint32]NFExporterStatRecord
SamplerInfo map[uint16]NFSamplerInfoRecord
}
// StreamReader read nfdump file record by record with minimal memory usage
func StreamReader(r io.Reader) (nfs *NFStream, err error) {
nfs = &NFStream{
r: r,
readNewBlock: true,
extMap: make(map[uint16][]uint16),
Exporters: make(map[uint16]NFExporterInfoRecord),
ExporterStats: make(map[uint32]NFExporterStatRecord),
SamplerInfo: make(map[uint16]NFSamplerInfoRecord),
}
if err = binary.Read(nfs.r, binary.LittleEndian, &nfs.Header); err != nil {
err = ErrFailedReadFileHeader
return nfs, err
}
if nfs.Header.Magic != magic {
err = ErrBadMagic
return nfs, err
}
if nfs.Header.Version != layoutVersion {
err = ErrUnsupportedFileVersion
return nfs, err
}
if err = binary.Read(nfs.r, binary.LittleEndian, &nfs.StatRecord); err != nil {
err = ErrFailedReadStatRecord
return nfs, err
}
return nfs, err
}
// Row each call will return an NFRecord struct or an error. io.EOF error means end of file.
func (nfs *NFStream) Row() (record NFRecord, err error) {
var (
ok bool
packetCountSize int
ipSize int
recordExtID uint16
readOffset int
byteCountSize int
exts []uint16
)
NextBlock:
if nfs.readNewBlock {
nfs.readNewBlock = false
if err = binary.Read(nfs.r, binary.LittleEndian, &nfs.blockHeader); err == io.EOF {
return
} else if err != nil {
err = ErrFailedReadBlockHeader
return record, err
}
nfs.blockIndex++
if len(nfs.blockData) < int(nfs.blockHeader.Size) {
nfs.blockData = make([]byte, nfs.blockHeader.Size)
}
if err = binary.Read(nfs.r, binary.LittleEndian, nfs.blockData[:nfs.blockHeader.Size]); err == io.EOF {
return record, err
} else if err != nil {
err = fmt.Errorf("Read Block Failed blockIndex:%d error:%w", nfs.blockIndex, err)
return record, err
}
// Only block type 2 is currently supported, any other types of data will be skipped
if nfs.blockHeader.ID != 2 {
nfs.readNewBlock = true
goto NextBlock
}
if (nfs.Header.Flags & compressionMask) == 0 {
nfs.decompressedBlock = nfs.blockData[:nfs.blockHeader.Size]
} else if (nfs.Header.Flags & lzoCompressed) > 0 {
if nfs.decompressedBlock, err = lzo.Decompress1X(bytes.NewReader(nfs.blockData[:nfs.blockHeader.Size]), 0, 0); err != nil {
err = fmt.Errorf("lzo.Decompress1X() failed error:%w", err)
return record, err
}
} else if (nfs.Header.Flags & lz4Compressed) > 0 {
err = fmt.Errorf("LZ4 compression not supported")
return record, err
// if _, err = lz4.Decode(nfs.decompressedBlock, blockData); err != nil {
// err = errors.Wrapf(err, "lz4.Decode() failed")
// return record, err
// }
} else if (nfs.Header.Flags & bz2Compressed) > 0 {
err = fmt.Errorf("BZ2 compression not supported")
return record, err
} else {
err = fmt.Errorf("Unsupported File Flag Compression:%d", nfs.Header.Flags)
return record, err
}
nfs.blockRecordCount = 0
nfs.start = 0
}
// START Record
NextRecord:
nfs.blockRecordCount++
nfs.recordHeader.Type = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][0:2])
nfs.recordHeader.Size = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][2:4])
if nfs.recordHeader.Size == 0 {
err = fmt.Errorf("Corrupt file, bad record size:%d", nfs.recordHeader.Size)
return record, err
}
// Keep count of how many of each record type
// nff.Meta.RecordIDCount[recordHeader.Type]++
switch nfs.recordHeader.Type {
case ExtensionMapRecordHeadType:
var mapID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][4:6])
var extSize = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][6:8])
// extSize == 0 extension map v2
// extSize > 0 extension map v1
if extSize == 0 {
err = fmt.Errorf("Unsupported extension map v2 file")
return record, err
}
var x uint16
var extStart uint16 = 6
var extEnd uint16 = 8
var newExtMapID uint16
/*
Subtract 8 for the size of the record header, mapID and extSize.
Type (2 byte) + Size (2 byte) + mapID (2 byte) + extSize (2 byte) = 8 bytes
Divide by 2 to get the total number of uint16 (2 byte) extension ID's
This is how to determine the total extensions in the record to read out and put in ext map.
*/
// If mapID already empty it before adding new extMapID's
if _, ok = nfs.extMap[mapID]; ok {
nfs.extMap[mapID] = nil
}
for x = 0; x < ((nfs.recordHeader.Size - 8) / 2); x++ {
extStart += 2
extEnd += 2
newExtMapID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][extStart:extEnd])
if newExtMapID > 48 {
err = fmt.Errorf("Corrupt file, bad extMapID:%d mapID:%d", newExtMapID, mapID)
return record, err
}
/*
v1 extension map aligns to 32bit so its possible there could be a 0 mapID at the end
When mapID is 0 just ignore it
*/
if newExtMapID != 0 {
nfs.extMap[mapID] = append(nfs.extMap[mapID], newExtMapID)
}
}
nfs.start += int(nfs.recordHeader.Size)
goto NextRecord
case ExporterInfoRecordHeadType:
// Store Exporter in map 'exporters'
var exporter NFExporterInfoRecord
exporter.Version = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][4:8])
exporter.SAFamily = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][24:26])
exporter.SysID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][26:28])
exporter.ID = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][28:32])
/*
NFDump stores the exporter IP as 2 uint64 integers. If the second uint64 [16:24]
is == 0 we assume its an IPv4 address and only need to use the [12:16] slice
*/
var ipNumber2 = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][16:24])
if ipNumber2 == 0 {
// IPv4
exporter.IPAddr = nfs.decompressedBlock[nfs.start:][12:16]
} else {
// IPv6
var tmpIP []byte
tmpIP = append(tmpIP, nfs.decompressedBlock[nfs.start:][16:24]...)
tmpIP = append(tmpIP, nfs.decompressedBlock[nfs.start:][8:16]...)
exporter.IPAddr = tmpIP
}
nfs.Exporters[exporter.SysID] = exporter
nfs.start += int(nfs.recordHeader.Size)
goto NextRecord
case SamplerInfoRecordHeadType:
// Store Samplers in map 'Samplers'
var sampler NFSamplerInfoRecord
sampler.ID = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][4:8])
sampler.Interval = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][8:12])
sampler.Mode = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][12:14])
sampler.ExporterSysID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][14:16])
nfs.SamplerInfo[sampler.ExporterSysID] = sampler
nfs.start += int(nfs.recordHeader.Size)
goto NextRecord
case EmptyRecordHeadType:
nfs.readNewBlock = true
goto NextBlock
case ExporterStatRecordHeadType:
// Exporter statistics records
var statCount uint32
var statPosition uint32
var statRecord NFExporterStatRecord
statCount = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][4:8])
for statPosition = 0; statPosition < statCount; statPosition++ {
j := (statPosition * 24) + 8 // each stat record is 24 bytes + 8 for header/stat count
statRecord.SysID = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][j : j+4])
statRecord.SequenceFailures = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][j+4 : j+8])
statRecord.Packets = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][j+8 : j+16])
statRecord.Flows = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][j+16 : j+24])
nfs.ExporterStats[statRecord.SysID] = statRecord
}
nfs.readNewBlock = true
goto NextBlock
default:
if nfs.recordHeader.Type != 10 {
nfs.start += int(nfs.recordHeader.Size)
goto NextRecord
}
}
record.Flags = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][4:6])
recordExtID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][6:8])
record.MsecFirst = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][8:10])
record.MsecLast = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][10:12])
record.First = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][12:16])
record.Last = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][16:20])
record.FwdStatus = uint8(nfs.decompressedBlock[nfs.start:][20])
record.TCPFlags = uint8(nfs.decompressedBlock[nfs.start:][21])
record.Proto = uint8(nfs.decompressedBlock[nfs.start:][22])
record.Tos = uint8(nfs.decompressedBlock[nfs.start:][23])
if record.Proto == 1 || record.Proto == 58 {
record.ICMPType = nfs.decompressedBlock[nfs.start:][27]
record.ICMPCode = nfs.decompressedBlock[nfs.start:][26]
record.SrcPort = 0
record.DstPort = (uint16(record.ICMPType) * 256) + uint16(record.ICMPCode)
} else {
record.SrcPort = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][24:26])
record.DstPort = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][26:28])
record.ICMPType = 0
record.ICMPCode = 0
}
record.ExporterSysID = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][28:30])
record.Reserved = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][30:32])
if (record.Flags & v6And) != 0 {
// nff.Meta.IPv6Count++
record.SrcIP = append(record.SrcIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][32:40])...)
record.SrcIP = append(record.SrcIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][40:48])...)
record.DstIP = append(record.DstIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][48:56])...)
record.DstIP = append(record.DstIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][56:64])...)
ipSize = 32
} else {
// nff.Meta.IPv4Count++
record.SrcIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][32:36])
record.DstIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][36:40])
ipSize = 8
}
if (record.Flags & packetCount8Byte) != 0 {
record.PacketCount = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][(32 + ipSize):][0:8])
packetCountSize = 8
} else {
record.PacketCount = uint64(binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][(32 + ipSize):][0:4]))
packetCountSize = 4
}
if (record.Flags & bytesCount8Byte) != 0 {
record.ByteCount = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][(32 + packetCountSize + ipSize):][0:8])
byteCountSize = 8
} else {
record.ByteCount = uint64(binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][(32 + packetCountSize + ipSize):][0:4]))
byteCountSize = 4
}
readOffset = 32 + packetCountSize + ipSize + byteCountSize
if exts, ok = nfs.extMap[recordExtID]; !ok {
err = fmt.Errorf("Extension not in map, ext:%d", recordExtID)
return record, err
}
for _, extID := range exts {
switch extID {
case 4:
record.Input = uint32(binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2]))
readOffset += 2
record.Output = uint32(binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2]))
readOffset += 2
case 5:
record.Input = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
record.Output = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
case 6:
record.SrcAS = uint32(binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2]))
readOffset += 2
record.DstAS = uint32(binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2]))
readOffset += 2
case 7:
record.SrcAS = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
record.DstAS = binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
case 8:
record.DstTos = nfs.decompressedBlock[nfs.start:][readOffset:][0]
readOffset++
record.Dir = nfs.decompressedBlock[nfs.start:][readOffset:][0]
readOffset++
record.SrcMask = nfs.decompressedBlock[nfs.start:][readOffset:][0]
readOffset++
record.DstMask = nfs.decompressedBlock[nfs.start:][readOffset:][0]
readOffset++
case 9:
record.NextHopIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
case 10:
record.NextHopIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:16])
readOffset += 16
case 11:
record.BGPNextIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
case 12:
record.BGPNextIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:16])
readOffset += 16
case 13:
record.SrcVlan = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2])
readOffset += 2
record.DstVLan = binary.LittleEndian.Uint16(nfs.decompressedBlock[nfs.start:][readOffset:][0:2])
readOffset += 2
case 14:
record.OutPkts = uint64(binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4]))
readOffset += 4
case 15:
record.OutPkts = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][readOffset:][0:8])
readOffset += 8
case 16:
record.OutBytes = uint64(binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4]))
readOffset += 4
case 17:
record.OutBytes = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][readOffset:][0:8])
readOffset += 8
case 18:
record.AggeFlows = uint64(binary.LittleEndian.Uint32(nfs.decompressedBlock[nfs.start:][readOffset:][0:4]))
readOffset += 4
case 19:
record.AggeFlows = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][readOffset:][0:8])
readOffset += 8
case 20:
// To be added later or as needed
readOffset += 16
case 21:
// To be added later or as needed
readOffset += 16
case 22:
// To be added later or as needed
readOffset += 40
case 23:
record.RouterIP = reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:4])
readOffset += 4
case 24:
record.RouterIP = append(record.RouterIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][0:8])...)
record.RouterIP = append(record.RouterIP, reverseByteSlice(nfs.decompressedBlock[nfs.start:][readOffset:][8:16])...)
readOffset += 16
case 25:
// To be added later or as needed
readOffset += 4
case 26:
// To be added later or as needed
readOffset += 8
case 27:
record.Received = binary.LittleEndian.Uint64(nfs.decompressedBlock[nfs.start:][readOffset:][0:8])
readOffset += 8
case 28:
// reserved
case 29:
// reserved
case 30:
// reserved
case 31:
// reserved
case 32:
// reserved
case 33:
// reserved
case 34:
// reserved
case 35:
// reserved
case 36:
// reserved
case 37:
// To be added later or as needed
readOffset += 20
case 38:
// To be added later or as needed
readOffset += 4
case 39:
// To be added later or as needed
readOffset += 8
case 40:
// To be added later or as needed
readOffset += 32
case 41:
// To be added later or as needed
readOffset += 24
case 42:
// To be added later or as needed
readOffset += 24
case 43:
// To be added later or as needed
readOffset += 72
case 44:
// reserved
case 45:
// To be added later or as needed
readOffset += 24
case 46:
// To be added later or as needed
readOffset += 12
case 47:
// To be added later or as needed
readOffset += 8
case 48:
// To be added later or as needed
readOffset += 8
}
}
nfs.start += int(nfs.recordHeader.Size)
if nfs.blockHeader.NumRecords == uint32(nfs.blockRecordCount) {
nfs.readNewBlock = true
}
return record, err
}