cmd/cli: use powershell to get physical interfaces

cmd/cli/net_windows.go

@@ -1,7 +1,10 @@
 package cli
 
 import (
+	"bufio"
+	"bytes"
 	"net"
+	"strings"
 )
 
 func patchNetIfaceName(iface *net.Interface) error {
@@ -11,13 +14,21 @@ func patchNetIfaceName(iface *net.Interface) error {
 // validInterface reports whether the *net.Interface is a valid one.
 // On Windows, only physical interfaces are considered valid.
 func validInterface(iface *net.Interface, validIfacesMap map[string]struct{}) bool {
-	if iface == nil {
-		return false
-	}
-	if isPhysicalInterface(iface.HardwareAddr.String()) {
-		return true
-	}
-	return false
+	_, ok := validIfacesMap[iface.Name]
+	return ok
 }
 
-func validInterfacesMap() map[string]struct{} { return nil }
+// validInterfacesMap returns a set of all physical interfaces.
+func validInterfacesMap() map[string]struct{} {
+	out, err := powershell("Get-NetAdapter -Physical | Select-Object -ExpandProperty Name")
+	if err != nil {
+		return nil
+	}
+	m := make(map[string]struct{})
+	scanner := bufio.NewScanner(bytes.NewReader(out))
+	for scanner.Scan() {
+		ifaceName := strings.TrimSpace(scanner.Text())
+		m[ifaceName] = struct{}{}
+	}
+	return m
+}