net: support forwarding to specific host IP addresses

environment/vm/lima/lima.go

@@ -374,6 +374,14 @@ func (l *limaVM) addPostStartActions(a *cli.ActiveCommandChain, conf config.Conf
 		return nil
 	})
 
+	// replicate addresses
+	a.Add(func() error {
+		if err := l.replicateHostAddresses(); err != nil {
+			logrus.Warnln(fmt.Errorf("unable to assign host IP addresses to the VM: %w", err))
+		}
+		return nil
+	})
+
 	// preserve state
 	a.Add(func() error {
 		if err := configmanager.SaveToFile(conf, config.CurrentProfile().StateFile()); err != nil {

environment/vm/lima/network.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/abiosoft/colima/embedded"
 	"github.com/abiosoft/colima/environment/vm/lima/limautil"
+	"github.com/abiosoft/colima/util"
 )
 
 func (l *limaVM) writeNetworkFile() error {
@@ -24,3 +25,12 @@ func (l *limaVM) writeNetworkFile() error {
 	}
 	return nil
 }
+
+func (l *limaVM) replicateHostAddresses() error {
+	for _, ip := range util.HostIPAddresses() {
+		if err := l.RunQuiet("sudo", "ip", "address", "add", ip.String()+"/24", "dev", "lo"); err != nil {
+			return err
+		}
+	}
+	return nil
+}

environment/vm/lima/yaml.go

@@ -240,6 +240,19 @@ func newConf(ctx context.Context, conf config.Config) (l limaconfig.Config, err
 				Proto:          limaconfig.TCP,
 			},
 		)
+
+		// bind all host addresses
+		for _, ip := range util.HostIPAddresses() {
+			l.PortForwards = append(l.PortForwards,
+				limaconfig.PortForward{
+					GuestIP:        ip,
+					GuestPortRange: [2]int{1, 65535},
+					HostIP:         ip,
+					HostPortRange:  [2]int{1, 65535},
+					Proto:          limaconfig.TCP,
+				},
+			)
+		}
 	}
 
 	switch strings.ToLower(conf.MountType) {

util/util.go

@@ -35,6 +35,25 @@ func RandomAvailablePort() int {
 	return listener.Addr().(*net.TCPAddr).Port
 }
 
+// HostIPAddresses returns all IPv4 addresses on the host.
+func HostIPAddresses() []net.IP {
+	var addresses []net.IP
+	ints, err := net.InterfaceAddrs()
+	if err != nil {
+		return nil
+	}
+	for i := range ints {
+		split := strings.Split(ints[i].String(), "/")
+		addr := net.ParseIP(split[0]).To4()
+		// ignore default loopback
+		if addr != nil && addr.String() != "127.0.0.1" {
+			addresses = append(addresses, addr)
+		}
+	}
+
+	return addresses
+}
+
 // ShellSplit splits cmd into arguments using.
 func ShellSplit(cmd string) []string {
 	split, err := shlex.Split(cmd)