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// Package vsock provides bindings to the hyperkit based
// implementation on macOS hosts. virtio Sockets are exposed as named
// pipes on macOS. Two modes are supported (to be set with
// SockerMode()):
// - Hyperkit mode: The package needs to be initialised with the path
// to where the named pipe was created.
// - Docker for Mac mode: This is a shortcut which hard codes the
// location of the named pipe.
package vsock
import (
"fmt"
"log"
"net"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
)
var (
socketPath string
connectPath string
socketFmt string
)
// SocketMode initialises the bindings to either raw hyperkit mode
// ("hyperkit:/path") or Docker for Mac mode ("docker"). This function
// must be called before using the vsock bindings.
func SocketMode(socketMode string) {
socketFmt = "%08x.%08x"
if strings.HasPrefix(socketMode, "hyperkit:") {
socketPath = socketMode[len("hyperkit:"):]
} else if socketMode == "docker" {
socketPath = filepath.Join(os.Getenv("HOME"), "/Library/Containers/com.docker.docker/Data/vms/0")
} else {
log.Fatalln("Unknown socket mode: ", socketMode)
}
connectPath = filepath.Join(socketPath, "connect")
}
// Dial creates a connection to the VM with the given client ID and port
func Dial(cid, port uint32) (Conn, error) {
c, err := net.DialUnix("unix", nil, &net.UnixAddr{connectPath, "unix"})
if err != nil {
return c, errors.Wrapf(err, "failed to dial on %s", connectPath)
}
if _, err := fmt.Fprintf(c, "%08x.%08x\n", cid, port); err != nil {
return c, errors.Wrapf(err, "Failed to write dest (%08x.%08x) to %s", cid, port, connectPath)
}
return c, nil
}
// Listen creates a listener for a specifc vsock.
func Listen(cid, port uint32) (net.Listener, error) {
sock := filepath.Join(socketPath, fmt.Sprintf(socketFmt, cid, port))
if err := os.Remove(sock); err != nil && !os.IsNotExist(err) {
log.Fatalln("Listen(): Remove:", err)
return nil, err
}
return net.ListenUnix("unix", &net.UnixAddr{sock, "unix"})
}
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