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package endpoints
import (
"errors"
"math"
"math/rand"
"net"
"github.com/mdlayher/vsock"
"golang.org/x/sys/unix"
"github.com/lxc/incus/v6/internal/server/endpoints/listeners"
localtls "github.com/lxc/incus/v6/shared/tls"
)
func createVsockListener(cert *localtls.CertInfo) (net.Listener, error) {
for range 10 {
// Get random port between 1024 and 65535.
port := 1024 + rand.Int31n(math.MaxUint16-1024)
// Setup listener on host context ID for inbound connections from the agent running inside VMs.
listener, err := vsock.ListenContextID(vsock.Host, uint32(port), nil)
if err != nil {
// Try a different port.
if errors.Is(err, unix.EADDRINUSE) {
continue
}
return nil, err
}
return listeners.NewFancyTLSListener(listener, cert), nil
}
return nil, errors.New("Failed finding free listen port for vsock listener")
}
// VsockAddress returns the network address of the vsock endpoint, or nil if there's no vsock endpoint.
func (e *Endpoints) VsockAddress() net.Addr {
e.mu.RLock()
defer e.mu.RUnlock()
listener := e.listeners[vmvsock]
if listener == nil {
return nil
}
return listener.Addr()
}
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