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Fix the request-response matcher maps iteration in clean() method and share the streams map with the TLS tapper (#1059)

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* Fix `panic: interface conversion: api.RequestResponseMatcher is nil, not *http.requestResponseMatcher` error

Also fix the request-response matcher maps iteration in `clean()` method.

* Fix the mocks in the unit tests

* Remove unnecessary fields from `tlsPoller` and implement `SetProtocol` method

* Use concrete types in `tap` package

* Share the streams map with the TLS tapper

* Check interface conversion error
This commit is contained in:
M. Mert Yıldıran 2022-05-01 06:16:22 -07:00 committed by GitHub
parent 0881dad17f
commit 1de50b0572
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 73 additions and 57 deletions
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2
tap/api/api.go
View File

@ -426,7 +426,7 @@ type TcpStream interface {
SetProtocol(protocol *Protocol)
GetOrigin() Capture
GetProtoIdentifier() *ProtoIdentifier
GetReqResMatcher() RequestResponseMatcher
GetReqResMatchers() []RequestResponseMatcher
GetIsTapTarget() bool
GetIsClosed() bool
}

6
tap/cleaner.go
View File

@ -34,12 +34,14 @@ func (cl *Cleaner) clean() {
cl.assemblerMutex.Unlock()
cl.streamsMap.Range(func(k, v interface{}) bool {
reqResMatcher := v.(api.TcpStream).GetReqResMatcher()
reqResMatchers := v.(api.TcpStream).GetReqResMatchers()
for _, reqResMatcher := range reqResMatchers {
if reqResMatcher == nil {
return true
continue
}
deleted := deleteOlderThan(reqResMatcher.GetMap(), startCleanTime.Add(-cl.connectionTimeout))
cl.stats.deleted += deleted
}
return true
})

6
tap/extensions/amqp/tcp_stream_mock_test.go
View File

@ -11,7 +11,7 @@ type tcpStream struct {
protoIdentifier *api.ProtoIdentifier
isTapTarget bool
origin api.Capture
reqResMatcher api.RequestResponseMatcher
reqResMatchers []api.RequestResponseMatcher
sync.Mutex
}
@ -32,8 +32,8 @@ func (t *tcpStream) GetProtoIdentifier() *api.ProtoIdentifier {
return t.protoIdentifier
}
func (t *tcpStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reqResMatcher
func (t *tcpStream) GetReqResMatchers() []api.RequestResponseMatcher {
return t.reqResMatchers
}
func (t *tcpStream) GetIsTapTarget() bool {

6
tap/extensions/http/tcp_stream_mock_test.go
View File

@ -11,7 +11,7 @@ type tcpStream struct {
protoIdentifier *api.ProtoIdentifier
isTapTarget bool
origin api.Capture
reqResMatcher api.RequestResponseMatcher
reqResMatchers []api.RequestResponseMatcher
sync.Mutex
}
@ -32,8 +32,8 @@ func (t *tcpStream) GetProtoIdentifier() *api.ProtoIdentifier {
return t.protoIdentifier
}
func (t *tcpStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reqResMatcher
func (t *tcpStream) GetReqResMatchers() []api.RequestResponseMatcher {
return t.reqResMatchers
}
func (t *tcpStream) GetIsTapTarget() bool {

6
tap/extensions/kafka/tcp_stream_mock_test.go
View File

@ -11,7 +11,7 @@ type tcpStream struct {
protoIdentifier *api.ProtoIdentifier
isTapTarget bool
origin api.Capture
reqResMatcher api.RequestResponseMatcher
reqResMatchers []api.RequestResponseMatcher
sync.Mutex
}
@ -32,8 +32,8 @@ func (t *tcpStream) GetProtoIdentifier() *api.ProtoIdentifier {
return t.protoIdentifier
}
func (t *tcpStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reqResMatcher
func (t *tcpStream) GetReqResMatchers() []api.RequestResponseMatcher {
return t.reqResMatchers
}
func (t *tcpStream) GetIsTapTarget() bool {

6
tap/extensions/redis/tcp_stream_mock_test.go
View File

@ -11,7 +11,7 @@ type tcpStream struct {
protoIdentifier *api.ProtoIdentifier
isTapTarget bool
origin api.Capture
reqResMatcher api.RequestResponseMatcher
reqResMatchers []api.RequestResponseMatcher
sync.Mutex
}
@ -32,8 +32,8 @@ func (t *tcpStream) GetProtoIdentifier() *api.ProtoIdentifier {
return t.protoIdentifier
}
func (t *tcpStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reqResMatcher
func (t *tcpStream) GetReqResMatchers() []api.RequestResponseMatcher {
return t.reqResMatchers
}
func (t *tcpStream) GetIsTapTarget() bool {

17
tap/passive_tapper.go
View File

@ -69,10 +69,12 @@ func StartPassiveTapper(opts *TapOpts, outputItems chan *api.OutputChannelItem,
extensions = extensionsRef
filteringOptions = options
streamsMap := NewTcpStreamMap()
if *tls {
for _, e := range extensions {
if e.Protocol.Name == "http" {
tlsTapperInstance = startTlsTapper(e, outputItems, options)
tlsTapperInstance = startTlsTapper(e, outputItems, options, streamsMap)
break
}
}
@ -82,7 +84,7 @@ func StartPassiveTapper(opts *TapOpts, outputItems chan *api.OutputChannelItem,
diagnose.StartMemoryProfiler(os.Getenv(MemoryProfilingDumpPath), os.Getenv(MemoryProfilingTimeIntervalSeconds))
}
streamsMap, assembler := initializePassiveTapper(opts, outputItems)
assembler := initializePassiveTapper(opts, outputItems, streamsMap)
go startPassiveTapper(streamsMap, assembler)
}
@ -181,9 +183,7 @@ func initializePacketSources() error {
return err
}
func initializePassiveTapper(opts *TapOpts, outputItems chan *api.OutputChannelItem) (api.TcpStreamMap, *tcpAssembler) {
streamsMap := NewTcpStreamMap()
func initializePassiveTapper(opts *TapOpts, outputItems chan *api.OutputChannelItem, streamsMap api.TcpStreamMap) *tcpAssembler {
diagnose.InitializeErrorsMap(*debug, *verbose, *quiet)
diagnose.InitializeTapperInternalStats()
@ -195,7 +195,7 @@ func initializePassiveTapper(opts *TapOpts, outputItems chan *api.OutputChannelI
assembler := NewTcpAssembler(outputItems, streamsMap, opts)
return streamsMap, assembler
return assembler
}
func startPassiveTapper(streamsMap api.TcpStreamMap, assembler *tcpAssembler) {
@ -232,7 +232,8 @@ func startPassiveTapper(streamsMap api.TcpStreamMap, assembler *tcpAssembler) {
logger.Log.Infof("AppStats: %v", diagnose.AppStats)
}
func startTlsTapper(extension *api.Extension, outputItems chan *api.OutputChannelItem, options *api.TrafficFilteringOptions) *tlstapper.TlsTapper {
func startTlsTapper(extension *api.Extension, outputItems chan *api.OutputChannelItem,
options *api.TrafficFilteringOptions, streamsMap api.TcpStreamMap) *tlstapper.TlsTapper {
tls := tlstapper.TlsTapper{}
chunksBufferSize := os.Getpagesize() * 100
logBufferSize := os.Getpagesize()
@ -262,7 +263,7 @@ func startTlsTapper(extension *api.Extension, outputItems chan *api.OutputChanne
}
go tls.PollForLogging()
go tls.Poll(emitter, options)
go tls.Poll(emitter, options, streamsMap)
return &tls
}

4
tap/tcp_reassembly_stream.go
View File

@ -148,12 +148,12 @@ func (t *tcpReassemblyStream) ReassembledSG(sg reassembly.ScatterGather, ac reas
stream := t.tcpStream.(*tcpStream)
if dir == reassembly.TCPDirClientToServer {
for i := range stream.getClients() {
reader := stream.getClient(i).(*tcpReader)
reader := stream.getClient(i)
reader.sendMsgIfNotClosed(NewTcpReaderDataMsg(data, timestamp))
}
} else {
for i := range stream.getServers() {
reader := stream.getServer(i).(*tcpReader)
reader := stream.getServer(i)
reader.sendMsgIfNotClosed(NewTcpReaderDataMsg(data, timestamp))
}
}

34
tap/tcp_stream.go
View File

@ -17,10 +17,10 @@ type tcpStream struct {
isClosed bool
protoIdentifier *api.ProtoIdentifier
isTapTarget bool
clients []api.TcpReader
servers []api.TcpReader
clients []*tcpReader
servers []*tcpReader
origin api.Capture
reqResMatcher api.RequestResponseMatcher
reqResMatchers []api.RequestResponseMatcher
createdAt time.Time
streamsMap api.TcpStreamMap
sync.Mutex
@ -57,38 +57,42 @@ func (t *tcpStream) close() {
for i := range t.clients {
reader := t.clients[i]
reader.(*tcpReader).close()
reader.close()
}
for i := range t.servers {
reader := t.servers[i]
reader.(*tcpReader).close()
reader.close()
}
}
func (t *tcpStream) addClient(reader api.TcpReader) {
func (t *tcpStream) addClient(reader *tcpReader) {
t.clients = append(t.clients, reader)
}
func (t *tcpStream) addServer(reader api.TcpReader) {
func (t *tcpStream) addServer(reader *tcpReader) {
t.servers = append(t.servers, reader)
}
func (t *tcpStream) getClients() []api.TcpReader {
func (t *tcpStream) getClients() []*tcpReader {
return t.clients
}
func (t *tcpStream) getServers() []api.TcpReader {
func (t *tcpStream) getServers() []*tcpReader {
return t.servers
}
func (t *tcpStream) getClient(index int) api.TcpReader {
func (t *tcpStream) getClient(index int) *tcpReader {
return t.clients[index]
}
func (t *tcpStream) getServer(index int) api.TcpReader {
func (t *tcpStream) getServer(index int) *tcpReader {
return t.servers[index]
}
func (t *tcpStream) addReqResMatcher(reqResMatcher api.RequestResponseMatcher) {
t.reqResMatchers = append(t.reqResMatchers, reqResMatcher)
}
func (t *tcpStream) SetProtocol(protocol *api.Protocol) {
t.Lock()
defer t.Unlock()
@ -102,13 +106,13 @@ func (t *tcpStream) SetProtocol(protocol *api.Protocol) {
for i := range t.clients {
reader := t.clients[i]
if reader.GetExtension().Protocol != t.protoIdentifier.Protocol {
reader.(*tcpReader).close()
reader.close()
}
}
for i := range t.servers {
reader := t.servers[i]
if reader.GetExtension().Protocol != t.protoIdentifier.Protocol {
reader.(*tcpReader).close()
reader.close()
}
}
@ -123,8 +127,8 @@ func (t *tcpStream) GetProtoIdentifier() *api.ProtoIdentifier {
return t.protoIdentifier
}
func (t *tcpStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reqResMatcher
func (t *tcpStream) GetReqResMatchers() []api.RequestResponseMatcher {
return t.reqResMatchers
}
func (t *tcpStream) GetIsTapTarget() bool {

5
tap/tcp_stream_factory.go
View File

@ -64,6 +64,7 @@ func (factory *tcpStreamFactory) New(net, transport gopacket.Flow, tcpLayer *lay
stream.setId(factory.streamsMap.NextId())
for i, extension := range extensions {
reqResMatcher := extension.Dissector.NewResponseRequestMatcher()
stream.addReqResMatcher(reqResMatcher)
counterPair := &api.CounterPair{
Request: 0,
Response: 0,
@ -114,8 +115,8 @@ func (factory *tcpStreamFactory) New(net, transport gopacket.Flow, tcpLayer *lay
factory.streamsMap.Store(stream.getId(), stream)
factory.wg.Add(2)
go stream.getClient(i).(*tcpReader).run(filteringOptions, &factory.wg)
go stream.getServer(i).(*tcpReader).run(filteringOptions, &factory.wg)
go stream.getClient(i).run(filteringOptions, &factory.wg)
go stream.getServer(i).run(filteringOptions, &factory.wg)
}
}
return reassemblyStream

8
tap/tcp_streams_map.go
View File

@ -48,7 +48,13 @@ func (streamMap *tcpStreamMap) CloseTimedoutTcpStreamChannels() {
<-ticker.C
streamMap.streams.Range(func(key interface{}, value interface{}) bool {
stream := value.(*tcpStream)
// `*tlsStream` is not yet applicable to this routine.
// So, we cast into `(*tcpStream)` and ignore `*tlsStream`
stream, ok := value.(*tcpStream)
if !ok {
return true
}
if stream.protoIdentifier.Protocol == nil {
if !stream.isClosed && time.Now().After(stream.createdAt.Add(tcpStreamChannelTimeoutMs)) {
stream.close()

14
tap/tlstapper/tls_poller.go
View File

@ -59,7 +59,7 @@ func (p *tlsPoller) close() error {
return p.chunksReader.Close()
}
func (p *tlsPoller) poll(emitter api.Emitter, options *api.TrafficFilteringOptions) {
func (p *tlsPoller) poll(emitter api.Emitter, options *api.TrafficFilteringOptions, streamsMap api.TcpStreamMap) {
chunks := make(chan *tlsChunk)
go p.pollChunksPerfBuffer(chunks)
@ -71,7 +71,7 @@ func (p *tlsPoller) poll(emitter api.Emitter, options *api.TrafficFilteringOptio
return
}
if err := p.handleTlsChunk(chunk, p.extension, emitter, options); err != nil {
if err := p.handleTlsChunk(chunk, p.extension, emitter, options, streamsMap); err != nil {
LogError(err)
}
case key := <-p.closedReaders:
@ -115,8 +115,8 @@ func (p *tlsPoller) pollChunksPerfBuffer(chunks chan<- *tlsChunk) {
}
}
func (p *tlsPoller) handleTlsChunk(chunk *tlsChunk, extension *api.Extension,
emitter api.Emitter, options *api.TrafficFilteringOptions) error {
func (p *tlsPoller) handleTlsChunk(chunk *tlsChunk, extension *api.Extension, emitter api.Emitter,
options *api.TrafficFilteringOptions, streamsMap api.TcpStreamMap) error {
ip, port, err := chunk.getAddress()
if err != nil {
@ -127,7 +127,7 @@ func (p *tlsPoller) handleTlsChunk(chunk *tlsChunk, extension *api.Extension,
reader, exists := p.readers[key]
if !exists {
reader = p.startNewTlsReader(chunk, ip, port, key, emitter, extension, options)
reader = p.startNewTlsReader(chunk, ip, port, key, emitter, extension, options, streamsMap)
p.readers[key] = reader
}
@ -142,7 +142,8 @@ func (p *tlsPoller) handleTlsChunk(chunk *tlsChunk, extension *api.Extension,
}
func (p *tlsPoller) startNewTlsReader(chunk *tlsChunk, ip net.IP, port uint16, key string,
emitter api.Emitter, extension *api.Extension, options *api.TrafficFilteringOptions) *tlsReader {
emitter api.Emitter, extension *api.Extension, options *api.TrafficFilteringOptions,
streamsMap api.TcpStreamMap) *tlsReader {
tcpid := p.buildTcpId(chunk, ip, port)
@ -173,6 +174,7 @@ func (p *tlsPoller) startNewTlsReader(chunk *tlsChunk, ip net.IP, port uint16, k
reader: reader,
protoIdentifier: &api.ProtoIdentifier{},
}
streamsMap.Store(streamsMap.NextId(), stream)
reader.parent = stream

2
tap/tlstapper/tls_reader.go
View File

@ -19,7 +19,7 @@ type tlsReader struct {
extension *api.Extension
emitter api.Emitter
counterPair *api.CounterPair
parent api.TcpStream
parent *tlsStream
reqResMatcher api.RequestResponseMatcher
}

4
tap/tlstapper/tls_stream.go
View File

@ -19,8 +19,8 @@ func (t *tlsStream) SetProtocol(protocol *api.Protocol) {
t.protoIdentifier.Protocol = protocol
}
func (t *tlsStream) GetReqResMatcher() api.RequestResponseMatcher {
return t.reader.reqResMatcher
func (t *tlsStream) GetReqResMatchers() []api.RequestResponseMatcher {
return []api.RequestResponseMatcher{t.reader.reqResMatcher}
}
func (t *tlsStream) GetIsTapTarget() bool {

4
tap/tlstapper/tls_tapper.go
View File

@ -50,8 +50,8 @@ func (t *TlsTapper) Init(chunksBufferSize int, logBufferSize int, procfs string,
return t.poller.init(&t.bpfObjects, chunksBufferSize)
}
func (t *TlsTapper) Poll(emitter api.Emitter, options *api.TrafficFilteringOptions) {
t.poller.poll(emitter, options)
func (t *TlsTapper) Poll(emitter api.Emitter, options *api.TrafficFilteringOptions, streamsMap api.TcpStreamMap) {
t.poller.poll(emitter, options, streamsMap)
}
func (t *TlsTapper) PollForLogging() {