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decoder.go
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decoder.go
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package decoder
import (
"bytes"
"container/list"
"net"
"reflect"
"strconv"
"strings"
"sync/atomic"
"time"
"unsafe"
"github.com/VictoriaMetrics/fastcache"
"github.com/segmentio/encoding/json"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/tcpassembly"
"github.com/negbie/freecache"
"github.com/negbie/logp"
"github.com/sipcapture/heplify/config"
"github.com/sipcapture/heplify/decoder/internal"
"github.com/sipcapture/heplify/ip4defrag"
"github.com/sipcapture/heplify/ip6defrag"
"github.com/sipcapture/heplify/ownlayers"
"github.com/sipcapture/heplify/protos"
)
var (
PacketQueue = make(chan *Packet, 20000)
scriptCache = fastcache.New(32 * 1024 * 1024)
)
type CachePayload struct {
SrcIP net.IP `json:"src_ip" default:""`
SrcPort uint16 `json:"src_port"`
DstIP net.IP `json:"dst_ip"`
DstPort uint16 `json:"dst_port"`
AckNumber uint32 `json:"ack_number"`
SeqNumber uint32 `json:"seq_number"`
NextSeqNumber uint32 `json:"next_seq_number"`
RemainLength int `json:"remain_length" default:"-1"`
FrameCount int `json:"frame_count" default:"0"`
Payload []byte `json:"payload"`
}
type Decoder struct {
asm *tcpassembly.Assembler
defrag4 *ip4defrag.IPv4Defragmenter
defrag6 *ip6defrag.IPv6Defragmenter
layerType gopacket.LayerType
decodedLayers []gopacket.LayerType
parser *gopacket.DecodingLayerParser
parserUDP *gopacket.DecodingLayerParser
parserTCP *gopacket.DecodingLayerParser
sll layers.LinuxSLL
d1q layers.Dot1Q
gre layers.GRE
eth layers.Ethernet
etherip layers.EtherIP
vxl ownlayers.VXLAN
hperm ownlayers.HPERM
ip4 layers.IPv4
ip6 layers.IPv6
tcp layers.TCP
udp layers.UDP
dns layers.DNS
sctp layers.SCTP
payload gopacket.Payload
dedupCache *freecache.Cache
filter []string
filterIP []string
filterSrcIP []string
filterDstIP []string
cachePayload *freecache.Cache
lastStatTime time.Time
stats
}
type stats struct {
fragCount uint64
dupCount uint64
dnsCount uint64
ip4Count uint64
ip6Count uint64
rtcpCount uint64
rtcpFailCount uint64
tcpCount uint64
hepCount uint64
sctpCount uint64
udpCount uint64
unknownCount uint64
_ uint32
}
type Packet struct {
Version byte
Protocol byte
SrcIP net.IP
DstIP net.IP
SrcPort uint16
DstPort uint16
Tsec uint32
Tmsec uint32
ProtoType byte
Payload []byte
CID []byte
Vlan uint16
}
// HEP chuncks
const (
Version = 1 // Chunk 0x0001 IP protocol family (0x02=IPv4, 0x0a=IPv6)
Protocol = 2 // Chunk 0x0002 IP protocol ID (0x06=TCP, 0x11=UDP)
IP4SrcIP = 3 // Chunk 0x0003 IPv4 source address
IP4DstIP = 4 // Chunk 0x0004 IPv4 destination address
IP6SrcIP = 5 // Chunk 0x0005 IPv6 source address
IP6DstIP = 6 // Chunk 0x0006 IPv6 destination address
SrcPort = 7 // Chunk 0x0007 Protocol source port
DstPort = 8 // Chunk 0x0008 Protocol destination port
Tsec = 9 // Chunk 0x0009 Unix timestamp, seconds
Tmsec = 10 // Chunk 0x000a Unix timestamp, microseconds
ProtoType = 11 // Chunk 0x000b Protocol type (DNS, LOG, RTCP, SIP)
NodeID = 12 // Chunk 0x000c Capture client ID
NodePW = 14 // Chunk 0x000e Authentication key (plain text / TLS connection)
Payload = 15 // Chunk 0x000f Captured packet payload
CID = 17 // Chunk 0x0011 Correlation ID
Vlan = 18 // Chunk 0x0012 VLAN
NodeName = 19 // Chunk 0x0013 NodeName
)
// HEP represents HEP packet
type HEP struct {
Version uint32 `protobuf:"varint,1,req,name=Version" json:"Version"`
Protocol uint32 `protobuf:"varint,2,req,name=Protocol" json:"Protocol"`
SrcIP string `protobuf:"bytes,3,req,name=SrcIP" json:"SrcIP"`
DstIP string `protobuf:"bytes,4,req,name=DstIP" json:"DstIP"`
SrcPort uint32 `protobuf:"varint,5,req,name=SrcPort" json:"SrcPort"`
DstPort uint32 `protobuf:"varint,6,req,name=DstPort" json:"DstPort"`
Tsec uint32 `protobuf:"varint,7,req,name=Tsec" json:"Tsec"`
Tmsec uint32 `protobuf:"varint,8,req,name=Tmsec" json:"Tmsec"`
ProtoType uint32 `protobuf:"varint,9,req,name=ProtoType" json:"ProtoType"`
NodeID uint32 `protobuf:"varint,10,req,name=NodeID" json:"NodeID"`
NodePW string `protobuf:"bytes,11,req,name=NodePW" json:"NodePW"`
Payload string `protobuf:"bytes,12,req,name=Payload" json:"Payload"`
CID string `protobuf:"bytes,13,req,name=CID" json:"CID"`
Vlan uint32 `protobuf:"varint,14,req,name=Vlan" json:"Vlan"`
ProtoString string
Timestamp time.Time
SIP string
NodeName string
TargetName string
SID string
}
type Context struct {
CaptureInfo gopacket.CaptureInfo
}
func (c *Context) GetCaptureInfo() gopacket.CaptureInfo {
return c.CaptureInfo
}
func NewDecoder(datalink layers.LinkType) *Decoder {
var lt gopacket.LayerType
switch datalink {
case layers.LinkTypeEthernet:
lt = layers.LayerTypeEthernet
case layers.LinkTypeLinuxSLL:
lt = layers.LayerTypeLinuxSLL
default:
lt = layers.LayerTypeEthernet
}
/* decoder := gopacket.NewDecodingLayerParser(
lt, &sll, &d1q, &gre, ð, &ip4, &ip6, &tcp, &udp, &dns, &payload,
) */
d := &Decoder{}
dlp := gopacket.NewDecodingLayerParser(lt)
dlp.SetDecodingLayerContainer(gopacket.DecodingLayerSparse(nil))
dlp.AddDecodingLayer(&d.sll)
dlp.AddDecodingLayer(&d.d1q)
dlp.AddDecodingLayer(&d.gre)
dlp.AddDecodingLayer(&d.eth)
dlp.AddDecodingLayer(&d.etherip)
dlp.AddDecodingLayer(&d.vxl)
//dlp.AddDecodingLayer(&d.hperm)
dlp.AddDecodingLayer(&d.ip4)
dlp.AddDecodingLayer(&d.ip6)
dlp.AddDecodingLayer(&d.sctp)
dlp.AddDecodingLayer(&d.udp)
dlp.AddDecodingLayer(&d.tcp)
dlp.AddDecodingLayer(&d.dns)
dlp.AddDecodingLayer(&d.payload)
d.parser = dlp
d.layerType = lt
d.defrag4 = ip4defrag.NewIPv4Defragmenter()
d.defrag6 = ip6defrag.NewIPv6Defragmenter()
d.decodedLayers = make([]gopacket.LayerType, 0, 12)
d.parserUDP = gopacket.NewDecodingLayerParser(layers.LayerTypeUDP, &d.udp)
d.parserTCP = gopacket.NewDecodingLayerParser(layers.LayerTypeTCP, &d.tcp)
d.filter = strings.Split(strings.ToUpper(config.Cfg.DiscardMethod), ",")
d.filterIP = strings.Split(config.Cfg.DiscardIP, ",")
d.filterSrcIP = strings.Split(config.Cfg.DiscardSrcIP, ",")
d.filterDstIP = strings.Split(config.Cfg.DiscardDstIP, ",")
d.cachePayload = freecache.NewCache(1024 * 1024 * 1024)
d.lastStatTime = time.Now()
if config.Cfg.Dedup {
d.dedupCache = freecache.NewCache(20 * 1024 * 1024) // 20 MB
}
if config.Cfg.Reassembly {
streamFactory := &tcpStreamFactory{}
streamPool := tcpassembly.NewStreamPool(streamFactory)
d.asm = tcpassembly.NewAssembler(streamPool)
d.asm.MaxBufferedPagesPerConnection = 1
d.asm.MaxBufferedPagesTotal = 1
go d.flushTCPAssembler(1 * time.Second)
}
go d.flushFragments(1 * time.Minute)
go d.printStats(1 * time.Minute)
return d
}
func (d *Decoder) defragIP4(i4 layers.IPv4, t time.Time) (*layers.IPv4, error) {
return d.defrag4.DefragIPv4WithTimestamp(&i4, t)
}
func (d *Decoder) defragIP6(i6 layers.IPv6, i6frag layers.IPv6Fragment, t time.Time) (*layers.IPv6, error) {
return d.defrag6.DefragIPv6WithTimestamp(&i6, &i6frag, t)
}
func (d *Decoder) Process(data []byte, ci *gopacket.CaptureInfo) {
if config.Cfg.Dedup {
if len(data) > 34 {
_, err := d.dedupCache.Get(data[34:])
if err == nil {
atomic.AddUint64(&d.dupCount, 1)
return
}
err = d.dedupCache.Set(data[34:], nil, 4) // 400 ms expire time
if err != nil {
logp.Warn("%v", err)
}
}
}
if config.Cfg.DiscardMethod != "" {
c := internal.ParseCSeq(data)
if c != nil {
for _, v := range d.filter {
if string(c) == v {
return
}
}
}
}
d.parser.DecodeLayers(data, &d.decodedLayers)
//logp.Debug("layer", "\n%v", d.decodedLayers)
foundGRELayer := false
i, j := 0, 0
for i := 0; i < len(d.decodedLayers); i++ {
if d.decodedLayers[i] == layers.LayerTypeVXLAN {
j = i
}
}
for i = j; i < len(d.decodedLayers); i++ {
switch d.decodedLayers[i] {
case layers.LayerTypeGRE:
if config.Cfg.Iface.WithErspan {
erspanVer := d.gre.Payload[0] & 0xF0 >> 4
if erspanVer == 1 && len(d.gre.Payload) > 8 {
d.parser.DecodeLayers(d.gre.Payload[8:], &d.decodedLayers)
if !foundGRELayer {
i = 0
}
foundGRELayer = true
} else if erspanVer == 2 && len(d.gre.Payload) > 12 {
off := 12
if d.gre.Payload[11]&1 == 1 && len(d.gre.Payload) > 20 {
off = 20
}
d.parser.DecodeLayers(d.gre.Payload[off:], &d.decodedLayers)
if !foundGRELayer {
i = 0
}
foundGRELayer = true
}
} else {
d.parser.DecodeLayers(d.gre.Payload, &d.decodedLayers)
if !foundGRELayer {
i = 0
}
foundGRELayer = true
}
case layers.LayerTypeIPv4:
atomic.AddUint64(&d.ip4Count, 1)
if d.ip4.Flags&layers.IPv4DontFragment != 0 || (d.ip4.Flags&layers.IPv4MoreFragments == 0 && d.ip4.FragOffset == 0) {
d.processTransport(&d.decodedLayers, &d.udp, &d.tcp, &d.sctp, d.ip4.NetworkFlow(), ci, 0x02, uint8(d.ip4.Protocol), d.ip4.SrcIP, d.ip4.DstIP)
break
}
ip4Len := d.ip4.Length
ip4New, err := d.defragIP4(d.ip4, ci.Timestamp)
if err != nil {
logp.Warn("%v, srcIP: %s, dstIP: %s\n\n", err, d.ip4.SrcIP, d.ip4.DstIP)
return
} else if ip4New == nil {
atomic.AddUint64(&d.fragCount, 1)
return
}
if ip4New.Length == ip4Len {
d.processTransport(&d.decodedLayers, &d.udp, &d.tcp, &d.sctp, d.ip4.NetworkFlow(), ci, 0x02, uint8(d.ip4.Protocol), d.ip4.SrcIP, d.ip4.DstIP)
} else {
logp.Debug("defrag", "%d byte fragment layer: %s with payload:\n%s\n%d byte re-assembled payload:\n%s\n\n",
ip4Len, d.decodedLayers, d.ip4.Payload, ip4New.Length, ip4New.Payload,
)
if ip4New.Protocol == layers.IPProtocolUDP {
d.parserUDP.DecodeLayers(ip4New.Payload, &d.decodedLayers)
} else if ip4New.Protocol == layers.IPProtocolTCP {
d.parserTCP.DecodeLayers(ip4New.Payload, &d.decodedLayers)
} else {
logp.Warn("unsupported IPv4 fragment layer")
return
}
d.processTransport(&d.decodedLayers, &d.udp, &d.tcp, &d.sctp, ip4New.NetworkFlow(), ci, 0x02, uint8(ip4New.Protocol), ip4New.SrcIP, ip4New.DstIP)
}
case layers.LayerTypeIPv6:
atomic.AddUint64(&d.ip6Count, 1)
if d.ip6.NextHeader != layers.IPProtocolIPv6Fragment {
d.processTransport(&d.decodedLayers, &d.udp, &d.tcp, &d.sctp, d.ip6.NetworkFlow(), ci, 0x0a, uint8(d.ip6.NextHeader), d.ip6.SrcIP, d.ip6.DstIP)
break
}
packet := gopacket.NewPacket(data, d.layerType, gopacket.DecodeOptions{Lazy: true, NoCopy: true})
if ip6frag := packet.Layer(layers.LayerTypeIPv6Fragment).(*layers.IPv6Fragment); ip6frag != nil {
ip6New, err := d.defragIP6(d.ip6, *ip6frag, ci.Timestamp)
if err != nil {
logp.Warn("%v, srcIP: %s, dstIP: %s\n\n", err, d.ip6.SrcIP, d.ip6.DstIP)
return
} else if ip6New == nil {
atomic.AddUint64(&d.fragCount, 1)
return
}
logp.Debug("defrag", "%d byte fragment layer: %s with payload:\n%s\n%d byte re-assembled payload:\n%s\n\n",
d.ip6.Length, d.decodedLayers, d.ip6.Payload, ip6New.Length, ip6New.Payload,
)
if ip6New.NextHeader == layers.IPProtocolUDP {
d.parserUDP.DecodeLayers(ip6New.Payload, &d.decodedLayers)
} else if ip6New.NextHeader == layers.IPProtocolTCP {
d.parserTCP.DecodeLayers(ip6New.Payload, &d.decodedLayers)
} else {
logp.Warn("unsupported IPv6 fragment layer")
return
}
d.processTransport(&d.decodedLayers, &d.udp, &d.tcp, &d.sctp, ip6New.NetworkFlow(), ci, 0x0a, uint8(ip6New.NextHeader), ip6New.SrcIP, ip6New.DstIP)
}
}
}
}
var SIP_REQUEST_METHOD = []string{
"INVITE",
"REGISTER",
"ACK",
"BYE",
"CANCEL",
"OPTIONS",
"PUBLISH",
"INFO",
"PRACK",
"SUBSCRIBE",
"NOTIFY",
"UPDATE",
"MESSAGE",
"REFER",
}
var SIP_RESPONSE_TEXT = []string{
"OK",
"TRYING",
"GIVING A TRY",
"CANCEL",
"CANCELING",
"RINGING",
"REQUEST TERMINATED",
"SESSION PROGRESS",
"UNAUTHORIZED",
"BUSY HERE",
"TEMPORARILY UNAVAILABLE",
"CALL DOES NOT EXIST",
"LOOP DETECTED",
"ADDRESS INCOMPLETE",
"NOT ACCEPTABLE HERE",
"INTERNAL SERVER ERROR",
"DECLINE",
"DOES NOT EXIST ANYWHERE",
"REG NOT FOUND",
"NOT ACCEPTABLE",
"NOT FOUND",
"CALL LEG/TRANSACTION DOES NOT EXIST",
"UNHANDLED BY DIALOG USAGES",
"ACCEPTED",
"REQUEST TIMEOUT",
"BAD REQUEST",
"FORBIDDEN",
"INVALID CSEQ",
"REQUEST CANCELLED",
"DEFAULT STATUS MESSAGE",
"OVERLAPPING REQUESTS",
"REQUEST PENDING",
"PAYMENT REQUIRED",
"UNSUPPORTED MEDIA TYPE",
"GATEWAY TIME-OUT",
"MOVED TEMPORARILY",
"CALL IS BEING TERMINATED",
"TOO MANY HOPS",
"BAD GATEWAY",
"NOT IMPLEMENTED",
"SESSION TERMINATED",
"CALL/TRANSACTION DOES NOT EXIST",
"PRECONDITION FAILURE",
"BAD SESSION DESCRIPTION",
"NEXT SERVICE TEMPORARILY UNAVAILABLE",
}
func startLineRequest(val string) int {
upperVal := strings.ToUpper(val)
indexEnd := strings.Index(upperVal, " SIP/2.0")
if indexEnd <= 0 {
return -1
}
if indexEnd != len(upperVal)-len(" SIP/2.0") {
return -1
}
indexStart := -1
for index := range SIP_REQUEST_METHOD {
indexStart = strings.Index(upperVal, SIP_REQUEST_METHOD[index])
if indexStart >= 0 {
break
}
}
if indexStart < 0 {
return -1
}
upperVal = upperVal[indexStart:]
parts := strings.SplitN(upperVal, " ", 3)
if len(parts) != 3 {
return -1
}
for index := range parts {
if len(parts[index]) <= 0 {
return -1
}
}
if len(parts[1]) < 8 || !strings.Contains(parts[1], "SIP:") {
return -1
}
if !strings.EqualFold(parts[2], "SIP/2.0") {
return -1
}
for index := range SIP_REQUEST_METHOD {
if strings.EqualFold(parts[0], SIP_REQUEST_METHOD[index]) {
return indexStart
}
}
return -1
}
func startLineResponse(val string) int {
upperVal := strings.ToUpper(val)
indexStart := strings.Index(upperVal, "SIP/2.0 ")
if indexStart < 0 {
return -1
}
upperVal = upperVal[indexStart:]
parts := strings.SplitN(upperVal, " ", 3)
if len(parts) != 3 {
return -1
}
if !strings.EqualFold(parts[0], "SIP/2.0") {
return -1
}
responseCode, err := strconv.Atoi(parts[1])
if err != nil || responseCode <= 0 {
return -1
}
if len(strings.TrimSpace(parts[2])) <= 0 {
return indexStart
}
for index := range SIP_RESPONSE_TEXT {
if strings.EqualFold(parts[2], SIP_RESPONSE_TEXT[index]) {
return indexStart
}
}
logp.Warn("startLineResponse missed response text val = %s", val)
return indexStart
}
func (d *Decoder) addCachePayload(cachePayload *CachePayload) (result bool) {
if len(cachePayload.Payload) <= 0 {
return true
}
cacheData, _ := json.Marshal(cachePayload)
cacheKeyBuffer := bytes.Buffer{}
cacheKeyBuffer.WriteString(cachePayload.SrcIP.String())
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.SrcPort), 10))
cacheKeyBuffer.WriteString(cachePayload.DstIP.String())
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.DstPort), 10))
//cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.AckNumber), 10))
cacheKeyBuffer.WriteString("last")
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.NextSeqNumber), 10))
d.cachePayload.Set(cacheKeyBuffer.Bytes(), cacheData, 30)
cacheKeyBuffer.Reset()
cacheKeyBuffer.WriteString(cachePayload.SrcIP.String())
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.SrcPort), 10))
cacheKeyBuffer.WriteString(cachePayload.DstIP.String())
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.DstPort), 10))
//cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.AckNumber), 10))
cacheKeyBuffer.WriteString("next")
cacheKeyBuffer.WriteString(strconv.FormatUint(uint64(cachePayload.SeqNumber), 10))
err := d.cachePayload.Set(cacheKeyBuffer.Bytes(), cacheData, 30)
if err != nil {
logp.Err("addCachePayload err = %v, payload = [%s]", err, string(cachePayload.Payload))
logp.Err("addCachePayload err = %v src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d, payload = [%s]",
err, cachePayload.SrcIP, cachePayload.SrcPort, cachePayload.DstIP, cachePayload.DstPort, cachePayload.AckNumber,
cachePayload.SeqNumber, cachePayload.NextSeqNumber, cachePayload.FrameCount, cachePayload.Payload)
return false
}
return true
}
func (d *Decoder) checkTransport(srcIP net.IP, srcPort uint16, dstIP net.IP, dstPort uint16, tcp *layers.TCP) (result bool, payLoadList *list.List) {
ackNumber := tcp.Ack
seqNumber := tcp.Seq
payload := tcp.Payload
cwr := tcp.CWR
ece := tcp.ECE
ns := tcp.NS
checkSum := tcp.Checksum
window := tcp.Window
payloadList := list.New()
payloadLen := len(payload)
if payloadLen <= 0 {
return false, payloadList
}
timeDelay := time.Now().Sub(d.lastStatTime).Milliseconds()
if timeDelay > 60*1000 {
logp.Info("checkTransport expired_count = %d, miss_count = %d, entry_count = %d, "+
"cwr = %t, ece = %t, ns = %t, check_sum = %d, window = %d",
d.cachePayload.ExpiredCount(), d.cachePayload.MissCount(), d.cachePayload.EntryCount(),
cwr, ece, ns, checkSum, window)
d.lastStatTime = time.Now()
}
nextCacheBuffer := bytes.Buffer{}
nextCacheBuffer.WriteString(srcIP.String())
nextCacheBuffer.WriteString(strconv.FormatUint(uint64(srcPort), 10))
nextCacheBuffer.WriteString(dstIP.String())
nextCacheBuffer.WriteString(strconv.FormatUint(uint64(dstPort), 10))
//nextCacheBuffer.WriteString(strconv.FormatUint(uint64(ackNumber), 10))
nextCacheBuffer.WriteString("next")
nextCacheBuffer.WriteString(strconv.FormatUint(uint64(seqNumber)+uint64(payloadLen), 10))
lastCacheBuffer := bytes.Buffer{}
lastCacheBuffer.WriteString(srcIP.String())
lastCacheBuffer.WriteString(strconv.FormatUint(uint64(srcPort), 10))
lastCacheBuffer.WriteString(dstIP.String())
lastCacheBuffer.WriteString(strconv.FormatUint(uint64(dstPort), 10))
//lastCacheBuffer.WriteString(strconv.FormatUint(uint64(ackNumber), 10))
lastCacheBuffer.WriteString("last")
lastCacheBuffer.WriteString(strconv.FormatUint(uint64(seqNumber), 10))
nextCachePayload := CachePayload{}
nextPayloadBytes, err := d.cachePayload.Get(nextCacheBuffer.Bytes())
if err == nil && len(nextPayloadBytes) > 0 {
if !d.cachePayload.Del(nextCacheBuffer.Bytes()) {
logp.Err("checkTransport del next cache failed")
}
err = json.Unmarshal(nextPayloadBytes, &nextCachePayload)
if err != nil {
logp.Err("checkTransport unmarshal next cache err = %v", err)
}
}
lastCachePayload := CachePayload{}
var lastPayloadBytes []byte
lastPayloadBytes, err = d.cachePayload.Get(lastCacheBuffer.Bytes())
if err == nil && len(lastPayloadBytes) > 0 {
if !d.cachePayload.Del(lastCacheBuffer.Bytes()) {
logp.Err("checkTransport del last cache failed")
}
err = json.Unmarshal(lastPayloadBytes, &lastCachePayload)
if err != nil {
logp.Err("checkTransport unmarshal last cache err = %v", err)
}
}
if len(nextPayloadBytes) <= 0 && len(lastPayloadBytes) <= 0 && payloadLen < 10 {
return false, payloadList
}
byteBuffer := bytes.Buffer{}
processCachePayload := CachePayload{}
if len(lastCachePayload.Payload) > 0 {
if seqNumber == lastCachePayload.NextSeqNumber {
byteBuffer.Write(lastCachePayload.Payload)
} else {
if lastCachePayload.SeqNumber != seqNumber ||
lastCachePayload.NextSeqNumber != (seqNumber+uint32(payloadLen)) ||
!bytes.Equal(lastCachePayload.Payload, payload) {
logp.Err("checkTransport retransmission payload src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, last_ack_number = %d, ack_number = %d, last_seq_number = %d, last_next_seq_number = %d, "+
"seq_number = %d, next_seq_number = %d, last_frame_count = %d",
srcIP, srcPort, dstIP, dstPort, lastCachePayload.AckNumber, ackNumber, lastCachePayload.SeqNumber,
lastCachePayload.NextSeqNumber, seqNumber, seqNumber+uint32(payloadLen), lastCachePayload.FrameCount)
logp.Err("checkTransport retransmission last = [%s], current = [%s]", string(lastCachePayload.Payload), string(payload))
}
}
processCachePayload.SeqNumber = lastCachePayload.SeqNumber
} else {
processCachePayload.SeqNumber = seqNumber
}
byteBuffer.Write(payload)
if len(nextCachePayload.Payload) > 0 {
if (seqNumber + uint32(payloadLen)) == nextCachePayload.SeqNumber {
byteBuffer.Write(nextCachePayload.Payload)
} else {
if nextCachePayload.SeqNumber != seqNumber ||
nextCachePayload.NextSeqNumber != (seqNumber+uint32(payloadLen)) ||
!bytes.Equal(nextCachePayload.Payload, payload) {
logp.Err("checkTransport retransmission payload src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, next_ack_number = %d, ack_number = %d, next_seq_number = %d, next_next_seq_number = %d, "+
"seq_number = %d, next_seq_number = %d, next_frame_count = %d",
srcIP, srcPort, dstIP, dstPort, nextCachePayload.AckNumber, ackNumber, nextCachePayload.SeqNumber,
nextCachePayload.NextSeqNumber, seqNumber, seqNumber+uint32(payloadLen), nextCachePayload.FrameCount)
logp.Err("checkTransport retransmission next = [%s], current = [%s]", string(nextCachePayload.Payload), string(payload))
}
}
processCachePayload.NextSeqNumber = nextCachePayload.NextSeqNumber
} else {
processCachePayload.NextSeqNumber = seqNumber + uint32(payloadLen)
}
processCachePayload.SrcIP = srcIP
processCachePayload.SrcPort = srcPort
processCachePayload.DstIP = dstIP
processCachePayload.DstPort = dstPort
processCachePayload.AckNumber = ackNumber
processCachePayload.FrameCount = lastCachePayload.FrameCount + nextCachePayload.FrameCount + 1
if len(lastCachePayload.Payload) > 0 && len(nextCachePayload.Payload) > 0 {
logp.Info("checkTransport combine last and next payload src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
srcIP, srcPort, dstIP, dstPort, ackNumber, processCachePayload.SeqNumber,
processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Info("checkTransport combine last and next last = [%s], current = [%s], next = [%s]",
string(lastCachePayload.Payload), string(payload), string(nextCachePayload.Payload))
}
currentPayLoad := byteBuffer.Bytes()
processCacheByteBuffer := bytes.Buffer{}
processCount := 0
for {
if len(currentPayLoad) <= 0 {
break
}
processCount++
if processCount > 30 {
logp.Err("checkTransport invalid process src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
srcIP, srcPort, dstIP, dstPort, ackNumber, processCachePayload.SeqNumber,
processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Err("checkTransport invalid process full_payload = [%s], current_payload = [%s]",
string(byteBuffer.Bytes()), string(currentPayLoad))
break
}
posHeaderEnd := bytes.Index(currentPayLoad, []byte("\r\n\r\n"))
if posHeaderEnd < 0 {
processCacheByteBuffer.Write(currentPayLoad)
break
}
if posHeaderEnd == 0 && bytes.Index(currentPayLoad, []byte("\r\n\r\n\r\n\r\n")) == 0 {
currentPayLoad = currentPayLoad[4:]
continue
}
// Split in headers and content
headers := currentPayLoad[:posHeaderEnd+4] // keep separator
content := currentPayLoad[posHeaderEnd+4:] // strip separator
currentContentLen := len(content)
headerLines := bytes.Split(headers, []byte("\r\n"))
headerPos := 0
for indexHeader := 0; indexHeader < len(headerLines); indexHeader++ {
headerLine := string(headerLines[indexHeader])
indexStartLine := startLineRequest(headerLine)
if indexStartLine < 0 {
indexStartLine = startLineResponse(headerLine)
}
if indexStartLine >= 0 {
headerPos += indexStartLine
break
}
if strings.Contains(headerLine, "SIP/2.0 200 OK") {
logp.Err("checkTransport invalid header line src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
srcIP, srcPort, dstIP, dstPort, ackNumber, processCachePayload.SeqNumber,
processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Err("checkTransport invalid header line full_payload = [%s], current_payload = [%s]",
string(byteBuffer.Bytes()), string(currentPayLoad))
}
if indexHeader == len(headerLines)-1 {
headerPos += len(headerLine)
} else {
headerPos += len(headerLine) + 2
}
}
if headerPos > 0 {
if headerPos > len(headers) {
headerPos = len(headers)
}
processCacheByteBuffer.Write(headers[:headerPos])
if headerPos >= len(headers) {
currentPayLoad = content
continue
}
headers = headers[headerPos:]
}
callID, err := getHeaderValue(callIdHeaderNames, headers)
if err != nil || len(callID) <= 0 {
logp.Err("checkTransport no call_id err = %s, src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
err.Error(), srcIP, srcPort, dstIP, dstPort, ackNumber, processCachePayload.SeqNumber,
processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Err("checkTransport no call_id full_payload = [%s], current_payload = [%s]",
string(byteBuffer.Bytes()), string(currentPayLoad))
currentPayLoad = content
continue
}
contentLength := -1
contentLengthValue, err := getHeaderValue(contentLengthHeaderNames, headers)
if err == nil && len(contentLengthValue) > 0 {
contentLength, _ = strconv.Atoi(strings.TrimSpace(string(contentLengthValue)))
}
if contentLength < 0 {
logp.Err("checkTransport invalid content_length src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
srcIP, srcPort, dstIP, dstPort, ackNumber, processCachePayload.SeqNumber,
processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Err("checkTransport invalid content_length full_payload = [%s], current_payload = [%s]",
string(byteBuffer.Bytes()), string(currentPayLoad))
currentPayLoad = content
continue
}
if contentLength > currentContentLen {
processCacheByteBuffer.Write(headers)
processCacheByteBuffer.Write(content)
currentPayLoad = nil
break
}
sipPayloadBuffer := bytes.Buffer{}
sipPayloadBuffer.Write(headers)
sipPayloadBuffer.Write(content[:contentLength])
payloadList.PushBack(sipPayloadBuffer.Bytes())
currentPayLoad = content[contentLength:]
if contentLength < currentContentLen {
logp.Info("checkTransport multi payload content_length = %d, current_content_len = %d, call_id = %s, src_ip = %v, src_port = %d, dst_ip = %v, "+
"dst_port = %d, ack_number = %d, seq_number = %d, next_seq_number = %d, frame_count = %d",
contentLength, currentContentLen, string(callID), srcIP, srcPort, dstIP, dstPort, ackNumber,
processCachePayload.SeqNumber, processCachePayload.NextSeqNumber, processCachePayload.FrameCount)
logp.Info("checkTransport multi payload content_length full_payload = [%s], current_payload = [%s]",
string(byteBuffer.Bytes()), string(currentPayLoad))
}
}
processCachePayload.Payload = processCacheByteBuffer.Bytes()
d.addCachePayload(&processCachePayload)
return true, payloadList
}
func (d *Decoder) processTransport(foundLayerTypes *[]gopacket.LayerType, udp *layers.UDP, tcp *layers.TCP, sctp *layers.SCTP, flow gopacket.Flow, ci *gopacket.CaptureInfo, IPVersion, IPProtocol uint8, sIP, dIP net.IP) {
if config.Cfg.DiscardIP != "" {
for _, v := range d.filterIP {
if dIP.String() == v {
logp.Debug("discarding destination IP", dIP.String())
return
}
if sIP.String() == v {
logp.Debug("discarding source IP", sIP.String())
return
}
}
}
if config.Cfg.DiscardSrcIP != "" {
for _, v := range d.filterSrcIP {
if sIP.String() == v {
logp.Debug("discarding source IP", sIP.String())
return
}
}
}
if config.Cfg.DiscardDstIP != "" {
for _, v := range d.filterDstIP {
if dIP.String() == v {
logp.Debug("discarding destination IP", dIP.String())
return
}
}
}
pkt := &Packet{
Version: IPVersion,
Protocol: IPProtocol,
SrcIP: sIP,
DstIP: dIP,
Tsec: uint32(ci.Timestamp.Unix()),
Tmsec: uint32(ci.Timestamp.Nanosecond() / 1000),
}
var payloadList *list.List
for _, layerType := range *foundLayerTypes {
switch layerType {
case layers.LayerTypeDot1Q:
pkt.Vlan = d.d1q.VLANIdentifier
case layers.LayerTypeUDP:
if len(udp.Payload) < 16 {
logp.Warn("received too small %d byte UDP packet with payload %v", len(udp.Payload), udp.Payload)
return
}
pkt.SrcPort = uint16(udp.SrcPort)
pkt.DstPort = uint16(udp.DstPort)
pkt.Payload = udp.Payload
atomic.AddUint64(&d.udpCount, 1)
logp.Debug("payload - UDP", string(pkt.Payload))
// HPERM layer check
if pkt.SrcPort == 7932 || pkt.DstPort == 7932 {
pkt := gopacket.NewPacket(pkt.Payload, d.hperm.LayerType(), gopacket.NoCopy)
HPERML := pkt.Layer(d.hperm.LayerType())
if HPERML != nil {
logp.Info("HPERM layer detected!")
HPERMpkt, _ := HPERML.(*ownlayers.HPERM)
//HPERMContent := HPERMpkt.LayerContents()
HPERMPayload := HPERMpkt.LayerPayload()
//logp.Info("HPERM Content:", HPERMContent)
//logp.Info("Payload: ", HPERMPayload)
// call again the process pkt to dissect the inner layers (aka the real pkt)
d.Process(HPERMPayload, ci)
}
}
if config.Cfg.Mode == "SIPLOG" {
if udp.DstPort == 514 {
pkt.ProtoType, pkt.CID = correlateLOG(udp.Payload)
if pkt.ProtoType > 0 && pkt.CID != nil {
PacketQueue <- pkt
}
return
}
}
if config.Cfg.Mode != "SIP" {
if (udp.Payload[0]&0xc0)>>6 == 2 {
if (udp.Payload[1] == 200 || udp.Payload[1] == 201 || udp.Payload[1] == 207) && udp.SrcPort%2 != 0 && udp.DstPort%2 != 0 {
pkt.Payload, pkt.CID = correlateRTCP(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, udp.Payload)
if pkt.Payload != nil {
pkt.ProtoType = 5
atomic.AddUint64(&d.rtcpCount, 1)
PacketQueue <- pkt
return
}
atomic.AddUint64(&d.rtcpFailCount, 1)
return
} else if udp.SrcPort%2 == 0 && udp.DstPort%2 == 0 {
if config.Cfg.Mode == "SIPRTP" {
logp.Debug("rtp", "\n%v", protos.NewRTP(udp.Payload))
}
pkt.Payload = nil
return
}
}
extractCID(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, pkt.Payload)
}
case layers.LayerTypeTCP:
pkt.SrcPort = uint16(tcp.SrcPort)
pkt.DstPort = uint16(tcp.DstPort)
atomic.AddUint64(&d.tcpCount, 1)
logp.Debug("payload", "TCP", pkt)
if config.Cfg.Reassembly {
d.asm.AssembleWithTimestamp(flow, tcp, ci.Timestamp)
return
}
if config.Cfg.SipAssembly {
var checkResult bool
checkResult, payloadList = d.checkTransport(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, tcp)
if !checkResult || payloadList.Len() <= 0 {
return
}
payloadList.PushBack(pkt.Payload)
for elem := payloadList.Front(); elem != nil; elem = elem.Next() {
extractCID(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, elem.Value.([]byte))
}
} else {
pkt.Payload = tcp.Payload
extractCID(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, pkt.Payload)
}
case layers.LayerTypeSCTP:
pkt.SrcPort = uint16(sctp.SrcPort)
pkt.DstPort = uint16(sctp.DstPort)
switch sctp.Payload[8] {
case 0: //DATA
pkt.Payload = sctp.Payload[16:]
case 64: //IDATA
pkt.Payload = sctp.Payload[20:]
}
atomic.AddUint64(&d.sctpCount, 1)
logp.Debug("payload", "SCTP:\n%s", pkt)
extractCID(pkt.SrcIP, pkt.SrcPort, pkt.DstIP, pkt.DstPort, pkt.Payload)
case layers.LayerTypeDNS:
if config.Cfg.Mode == "SIPDNS" {
pkt.ProtoType = 53
pkt.Payload = protos.ParseDNS(&d.dns)
atomic.AddUint64(&d.dnsCount, 1)
PacketQueue <- pkt
return
}
}
}
var cPos int
if payloadList != nil && payloadList.Len() > 0 {
for elem := payloadList.Front(); elem != nil; elem = elem.Next() {
pkt2 := &Packet{
Version: pkt.Version,
Protocol: pkt.Protocol,
SrcIP: pkt.SrcIP,
DstIP: pkt.DstIP,
SrcPort: pkt.SrcPort,