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tcpmux's Introduction

TcpMux

TCP Mux is a TCP router that supports optional SSL re-encryption and offloading

Build Status

Installation

TcpMux can be installed as a .NET Core global tool. To set it up, install the latest .NET Core SDK, and run:

dotnet tool install -g tcpmux

This will allow you to launch TcpMux directly on the command line by entering tcpmux.

Usage

 tcpmux [options] <listen_port> <target_host> <target_port>

Options

     -v: Verbose mode; display traffic
     -hex: Hex mode; display traffic as hex dump
     -text: Text mode; display traffic as text dump
     -ssl: perform ssl decoding and reencoding
     -sslOff: perform ssl off-loading (ie connect to the target via SSL, and expose a decrypted port)
     -sslCn: CN to use in the generated SSL certificate (defaults to <target_host>)
     -regCA: register self-signed certificate CA

tcpmux's People

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tcpmux's Issues

Multiplexed stream are always sending packets by batch of 4,096 bytes

Command: dotnet run --no-build -- -mux localhost:2202 -l 443 -ssl -sni

Result:

[23:49:41 INF] Read 26280 bytes from multiplexed stream 1
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Sending 4,096 bytes from www.bbc.co.uk:443 to 127.0.0.1:60939...
[23:49:41 INF] Read 24887 bytes from multiplexed stream 1

Why are messages split in 4,096 bytes? The batch size should be 65,536.

Tunnel-in mode doesn't handle connection closure

When running in Tunnel-In mode, when a tunnel connection is closed we should:

  • if it's not active: remove it from the channel and wait for the next one
  • if it's active: close the corresponding client connection

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