Add a TCP proxy for debugging. v6.0.117

[winlinvip]

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

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:

./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.

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TRANS_BY_GPT4

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Co-authored-by: john [email protected]