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642fa98976
This includes two new hidden commands: a 9p server, `podman machine server9p`, and a 9p client, `podman machine client9p` with `server9p` currently only configured to run on Windows and serve 9p via HyperV vsock, and `client9p` only configured to run on Linux. The server is run by `podman machine start` and has the same lifespan as gvproxy (waits for the gvproxy PID to die before shutting down). The client is run inside the VM, also by `podman machine start`, and mounts uses kernel 9p mount code to complete the mount. It's unfortunately not possible to use mount directly without the wrapper; we need to set up the vsock and pass it to mount as an FD. In theory this can be generalized so that the server can run anywhere and over almost any transport, but I haven't done this here as I don't think we have a usecase other than HyperV right now. [NO NEW TESTS NEEDED] This requires changes to Podman in the VM, so we need to wait until a build with this lands in FCOS to test. Signed-off-by: Matthew Heon <matthew.heon@pm.me>
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
//go:build linux
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// +build linux
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package vsock
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import (
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"context"
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"github.com/mdlayher/socket"
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"golang.org/x/sys/unix"
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)
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// A conn is the net.Conn implementation for connection-oriented VM sockets.
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// We can use socket.Conn directly on Linux to implement all of the necessary
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// methods.
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type conn = socket.Conn
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// dial is the entry point for Dial on Linux.
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func dial(cid, port uint32, _ *Config) (*Conn, error) {
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// TODO(mdlayher): Config default nil check and initialize. Pass options to
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// socket.Config where necessary.
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c, err := socket.Socket(unix.AF_VSOCK, unix.SOCK_STREAM, 0, "vsock", nil)
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if err != nil {
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return nil, err
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}
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sa := &unix.SockaddrVM{CID: cid, Port: port}
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rsa, err := c.Connect(context.Background(), sa)
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if err != nil {
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_ = c.Close()
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return nil, err
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}
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// TODO(mdlayher): getpeername(2) appears to return nil in the GitHub CI
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// environment, so in the event of a nil sockaddr, fall back to the previous
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// method of synthesizing the remote address.
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if rsa == nil {
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rsa = sa
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}
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lsa, err := c.Getsockname()
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if err != nil {
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_ = c.Close()
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return nil, err
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}
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lsavm := lsa.(*unix.SockaddrVM)
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rsavm := rsa.(*unix.SockaddrVM)
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return &Conn{
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c: c,
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local: &Addr{
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ContextID: lsavm.CID,
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Port: lsavm.Port,
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},
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remote: &Addr{
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ContextID: rsavm.CID,
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Port: rsavm.Port,
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},
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}, nil
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}
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