Function getWSL2VirtioProxyWindowsIP

pkg/dockerutil/host_docker_internal.go:217–236

getWSL2VirtioProxyWindowsIP uses PowerShell to get the Windows vEthernet (WSL) interface IP. In virtioproxy mode, the default gateway is the network router (not Windows), so we need the Hyper-V virtual switch IP that connects Windows to WSL2.

()

// In virtioproxy mode, the default gateway is the network router (not Windows),
// so we need the Hyper-V virtual switch IP that connects Windows to WSL2.
func getWSL2VirtioProxyWindowsIP() (string, error) {
	psScript := `Get-NetIPAddress -AddressFamily IPv4 -ErrorAction SilentlyContinue | Where-Object { $_.InterfaceAlias -like 'vEthernet (WSL*' } | Select-Object -First 1 -ExpandProperty IPAddress`

	cmd := exec.Command("powershell.exe", "-NoProfile", "-NonInteractive", "-Command", psScript)
	out, err := cmd.CombinedOutput()
	if err != nil {
		return "", fmt.Errorf("powershell failed in getWSL2VirtioProxyWindowsIP: %w (output: %s)", err, string(out))
	}

	ip := strings.TrimSpace(string(out))
	if ip == "" {
		return "", fmt.Errorf("no vEthernet (WSL) IPv4 address found via PowerShell")
	}

	if parsedIP := net.ParseIP(ip); parsedIP == nil {
		return "", fmt.Errorf("unable to parse IP address '%s' from vEthernet (WSL) interface", ip)
	}

	return ip, nil
}

// getWSL2PhysicalIP returns the WSL2 VM's own physical IP address by finding
// the source IP used for traffic to an external destination. This is used as a