iq-scm / go-reuseport

reuse tcp/udp ports in golang

go-reuseport

This package enables listening and dialing from the same TCP or UDP port. This means that the following sockopts may be set:

SO_REUSEADDR
SO_REUSEPORT

This is a simple package to help with address reuse. This is particularly important when attempting to do TCP NAT holepunching, which requires a process to both Listen and Dial on the same TCP port. This package provides some utilities around enabling this behaviour on various OS.

Examples

// listen on the same port. oh yeah.
l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
l2, _ := reuse.Listen("tcp", "127.0.0.1:1234")

// dial from the same port. oh yeah.
l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
l2, _ := reuse.Listen("tcp", "127.0.0.1:1235")
c, _ := reuse.Dial("tcp", "127.0.0.1:1234", "127.0.0.1:1235")

Note: cant dial self because tcp/ip stacks use 4-tuples to identify connections, and doing so would clash.

Tested

Tested on darwin, linux, and windows.

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The last gx published version of this module was: 0.2.2: Qme8kdM7thoCqLqd7GYCRqipoZJS64rhJo5MBcTpyWfsL9