Enable port forwarding on host

Using the gvproxy application on the host, we can now port forward from
the machine vm on the host.  It requires that 'gvproxy' be installed in
an executable location.  gvproxy can be found in the
containers/gvisor-tap-vsock github repo.

[NO TESTS NEEDED]

Signed-off-by: Brent Baude <bbaude@redhat.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go
index 0e8a4f768..c928e02a6 100644
--- a/libpod/networking_linux.go
+++ b/libpod/networking_linux.go
@@ -273,7 +273,6 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
 				if err != nil {
 					return nil, errors.Wrap(err, "error creating rootless cni network namespace")
 				}
-
 				// setup slirp4netns here
 				path := r.config.Engine.NetworkCmdPath
 				if path == "" {
@@ -437,9 +436,32 @@ func (r *Runtime) GetRootlessCNINetNs(new bool) (*RootlessCNI, error) {
 	return rootlessCNINS, nil
 }
 
+// setPrimaryMachineIP is used for podman-machine and it sets
+// and environment variable with the IP address of the podman-machine
+// host.
+func setPrimaryMachineIP() error {
+	// no connection is actually made here
+	conn, err := net.Dial("udp", "8.8.8.8:80")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err := conn.Close(); err != nil {
+			logrus.Error(err)
+		}
+	}()
+	addr := conn.LocalAddr().(*net.UDPAddr)
+	return os.Setenv("PODMAN_MACHINE_HOST", addr.IP.String())
+}
+
 // setUpOCICNIPod will set up the cni networks, on error it will also tear down the cni
 // networks. If rootless it will join/create the rootless cni namespace.
 func (r *Runtime) setUpOCICNIPod(podNetwork ocicni.PodNetwork) ([]ocicni.NetResult, error) {
+	if r.config.MachineEnabled() {
+		if err := setPrimaryMachineIP(); err != nil {
+			return nil, err
+		}
+	}
 	rootlessCNINS, err := r.GetRootlessCNINetNs(true)
 	if err != nil {
 		return nil, err