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Implementation Notes

On Windows we depend on Hyper-V sockets (AF_HYPERV). There are two services with the following GUIDs:

  • ethernet: 30D48B34-7D27-4B0B-AAAF-BBBED334DD59
  • port forwarding: 0B95756A-9985-48AD-9470-78E060895BE7

These services must be registered in the registry, see the powershell script register.ps1.

To start the service, first discover the VM Id with:

(Get-VM -Name myvmname).Id

and then:

./com.docker.slirp.exe --ethernet hyperv-connect://<VM UUID> --debug

Since Hyper-V sockets don't currently support graceful shutdown, the port forwarding code uses a simple message-based protocol where messages can be

  • data
  • a shutdown read request
  • a shutdown write request
  • a close request

Once a peer has received an acknowledgement of a close request it is free to actually close the socket (which will discard any remaining in-flight data).

See https://github.com/rneugeba/virtsock/tree/master/go/hvsock