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Add a TCP proxy for debugging. v6.0.117 (#3958)

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When debugging the RTMP protocol, we can capture packets using tcpdump
and then replay the pcap file. For example:

```bash
cd ~/git/srs/trunk/3rdparty/srs-bench/pcap
tcpdump -i any -w t.pcap tcp port 1935
go run . -f ./t.pcap -s 127.0.0.1:1935
```

However, sometimes due to poor network conditions between the server and
the client, there may be many retransmitted packets. In such cases,
setting up a transparent TCP proxy that listens on port 1935 and
forwards to port 19350 can be a solution:

```bash
./objs/srs -c conf/origin.conf 
cd 3rdparty/srs-bench/tcpproxy/ && go run main.go
tcpdump -i any -w t.pcap tcp port 19350
```

This approach allows for the implementation of packet dumping,
multipoint replication, or the provision of detailed timestamps and byte
information at the proxy. It enables the collection of debugging
information without the need to modify the server.



---------

`TRANS_BY_GPT4`

---------

Co-authored-by: john <hondaxiao@tencent.com>
This commit is contained in:
Winlin 2024-03-19 21:10:10 +08:00 • committed by GitHub
parent 26f4ab9923
commit ce2ce1542f
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GPG key ID: B5690EEEBB952194
4 changed files with 176 additions and 6 deletions
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20
trunk/3rdparty/srs-bench/pcap/main.go vendored
View file

@ -7,6 +7,7 @@ import (
"fmt"
"net"
"os"
"strings"
"time"
"github.com/google/gopacket"
@ -62,9 +63,19 @@ func doMain(ctx context.Context) error {
}
defer f.Close()
r, err := pcapgo.NewNgReader(f, pcapgo.DefaultNgReaderOptions)
if err != nil {
return errors.Wrapf(err, "new reader")
var source *gopacket.PacketSource
if strings.HasSuffix(filename, ".pcap") {
r, err := pcapgo.NewReader(f)
if err != nil {
return errors.Wrapf(err, "new reader")
}
source = gopacket.NewPacketSource(r, r.LinkType())
} else {
r, err := pcapgo.NewNgReader(f, pcapgo.DefaultNgReaderOptions)
if err != nil {
return errors.Wrapf(err, "new reader")
}
source = gopacket.NewPacketSource(r, r.LinkType())
}
// TODO: FIXME: Should start a goroutine to consume bytes from conn.
@ -76,7 +87,6 @@ func doMain(ctx context.Context) error {
var packetNumber uint64
var previousTime *time.Time
source := gopacket.NewPacketSource(r, r.LinkType())
for packet := range source.Packets() {
packetNumber++
@ -90,7 +100,7 @@ func doMain(ctx context.Context) error {
if len(payload) == 0 {
continue
}
if tcp.DstPort != 1935 {
if tcp.DstPort != 1935 && tcp.DstPort != 19350 {
continue
}