fix: softap_manage example uses INetworkManagementService instead of hostapd HAL

Replace android.hardware.wifi.hostapd.IHostapd vendor HAL with
INetworkManagementService via "network_management" system service. Shows
network interface list, bandwidth control status, and tethering status
(where available). Documents API 36 method removals.

Author: xaionaro@dx.center

examples/softap_manage/main.go

@@ -1,16 +1,14 @@
-// Manage SoftAP (WiFi hotspot) via the hostapd HAL.
+// Query network management status via the INetworkManagementService system service.
 //
-// This example demonstrates how to start and stop a WiFi access point,
-// force-disconnect clients, and configure AP parameters using the
-// android.hardware.wifi.hostapd HAL interface.
+// Uses INetworkManagementService via the "network_management" service to
+// list network interfaces, check tethering and firewall/bandwidth status.
 //
-// Note: The hostapd HAL is only available on devices with real WiFi hardware.
-// It may be blocked by SELinux for unprivileged binaries. On a real device,
-// run as root or with the appropriate SELinux context.
+// Note: Some methods require root or AID_SYSTEM, and some tethering methods
+// were removed in Android API 36+.
 //
 // Build:
 //
-//	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -o build/softap_manage ./examples/softap_manage/
+//	GOOS=linux GOARCH=arm64 CGO_ENABLED=0 go build -o build/softap_manage ./examples/softap_manage/
 //	adb push softap_manage /data/local/tmp/ && adb shell /data/local/tmp/softap_manage
 package main
 
@@ -19,28 +17,14 @@ import (
 	"fmt"
 	"os"
 
+	genOs "github.com/xaionaro-go/binder/android/os"
 	"github.com/xaionaro-go/binder/binder"
 	"github.com/xaionaro-go/binder/binder/versionaware"
-	"github.com/xaionaro-go/binder/android/hardware/wifi/hostapd"
 	"github.com/xaionaro-go/binder/kernelbinder"
 	"github.com/xaionaro-go/binder/servicemanager"
 )
 
-const halServiceName = servicemanager.ServiceName("android.hardware.wifi.hostapd.IHostapd/default")
-
 func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintf(os.Stderr, "Usage: %s <command> [args...]\n", os.Args[0])
-		fmt.Fprintf(os.Stderr, "\nCommands:\n")
-		fmt.Fprintf(os.Stderr, "  start <iface> <ssid> <passphrase>  Start AP on interface\n")
-		fmt.Fprintf(os.Stderr, "  stop <iface>                       Stop AP on interface\n")
-		fmt.Fprintf(os.Stderr, "  kick <iface> <mac_hex>             Disconnect a client\n")
-		fmt.Fprintf(os.Stderr, "  terminate                          Terminate hostapd daemon\n")
-		fmt.Fprintf(os.Stderr, "\nExample:\n")
-		fmt.Fprintf(os.Stderr, "  %s start wlan1 MyHotspot s3cretP4ss\n", os.Args[0])
-		os.Exit(1)
-	}
-
 	ctx := context.Background()
 
 	driver, err := kernelbinder.Open(ctx, binder.WithMapSize(128*1024))
@@ -58,152 +42,60 @@ func main() {
 
 	sm := servicemanager.New(transport)
 
-	svc, err := sm.GetService(ctx, halServiceName)
+	svc, err := sm.GetService(ctx, servicemanager.NetworkmanagementService)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "get hostapd HAL: %v\n", err)
-		fmt.Fprintf(os.Stderr, "(hostapd HAL not available — no WiFi hardware or SELinux denial)\n")
+		fmt.Fprintf(os.Stderr, "get network_management service: %v\n", err)
+		fmt.Fprintf(os.Stderr, "(INetworkManagementService not available or access denied)\n")
 		os.Exit(1)
 	}
 
-	ap := hostapd.NewHostapdProxy(svc)
-
-	switch os.Args[1] {
-	case "start":
-		cmdStart(ctx, ap)
-	case "stop":
-		cmdStop(ctx, ap)
-	case "kick":
-		cmdKick(ctx, ap)
-	case "terminate":
-		cmdTerminate(ctx, ap)
-	default:
-		fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
-		os.Exit(1)
-	}
-}
-
-func cmdStart(
-	ctx context.Context,
-	ap *hostapd.HostapdProxy,
-) {
-	if len(os.Args) < 5 {
-		fmt.Fprintf(os.Stderr, "usage: start <iface> <ssid> <passphrase>\n")
-		os.Exit(1)
-	}
+	netMgr := genOs.NewNetworkManagementServiceProxy(svc)
 
-	ifaceName := os.Args[2]
-	ssid := os.Args[3]
-	passphrase := os.Args[4]
-
-	ifaceParams := hostapd.IfaceParams{
-		Name: ifaceName,
-		HwModeParams: hostapd.HwModeParams{
-			Enable80211N:  true,
-			Enable80211AC: true,
-			Enable80211AX: true,
-		},
-		ChannelParams: []hostapd.ChannelParams{
-			{
-				BandMask:  hostapd.BandMaskBand2Ghz,
-				EnableAcs: true, // Let the driver pick the best channel.
-			},
-		},
-	}
-
-	nwParams := hostapd.NetworkParams{
-		Ssid:           []byte(ssid),
-		IsHidden:       false,
-		EncryptionType: hostapd.EncryptionTypeWpa3SaeTransition,
-		Passphrase:     passphrase,
-	}
-
-	err := ap.AddAccessPoint(ctx, ifaceParams, nwParams)
+	// Check tethering status (may be absent on API 36+).
+	tethering, err := netMgr.IsTetheringStarted(ctx)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "AddAccessPoint: %v\n", err)
-		os.Exit(1)
-	}
-
-	fmt.Printf("Access point started on %s\n", ifaceName)
-	fmt.Printf("  SSID:       %s\n", ssid)
-	fmt.Printf("  Security:   WPA3-SAE Transition\n")
-	fmt.Printf("  Band:       2.4 GHz (ACS)\n")
-}
-
-func cmdStop(
-	ctx context.Context,
-	ap *hostapd.HostapdProxy,
-) {
-	if len(os.Args) < 3 {
-		fmt.Fprintf(os.Stderr, "usage: stop <iface>\n")
-		os.Exit(1)
+		fmt.Fprintf(os.Stderr, "IsTetheringStarted: %v\n", err)
+		fmt.Fprintf(os.Stderr, "  (this method was removed in Android API 36)\n")
+	} else {
+		fmt.Printf("Tethering active: %v\n", tethering)
 	}
 
-	ifaceName := os.Args[2]
-	err := ap.RemoveAccessPoint(ctx, ifaceName)
+	// List tethered interfaces (may be absent on API 36+).
+	tethered, err := netMgr.ListTetheredInterfaces(ctx)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "RemoveAccessPoint: %v\n", err)
-		os.Exit(1)
-	}
-
-	fmt.Printf("Access point stopped on %s\n", ifaceName)
-}
-
-func cmdKick(
-	ctx context.Context,
-	ap *hostapd.HostapdProxy,
-) {
-	if len(os.Args) < 4 {
-		fmt.Fprintf(os.Stderr, "usage: kick <iface> <mac_hex>\n")
-		fmt.Fprintf(os.Stderr, "  mac_hex: 6-byte MAC as hex, e.g. aabbccddeeff\n")
-		os.Exit(1)
-	}
-
-	ifaceName := os.Args[2]
-	macHex := os.Args[3]
-
-	mac, err := hexToBytes(macHex)
-	if err != nil || len(mac) != 6 {
-		fmt.Fprintf(os.Stderr, "invalid MAC address: %s (need 12 hex chars)\n", macHex)
-		os.Exit(1)
+		fmt.Fprintf(os.Stderr, "ListTetheredInterfaces: %v\n", err)
+		fmt.Fprintf(os.Stderr, "  (this method was removed in Android API 36)\n")
+	} else if len(tethered) == 0 {
+		fmt.Println("Tethered interfaces: (none)")
+	} else {
+		fmt.Printf("Tethered interfaces: %v\n", tethered)
 	}
 
-	err = ap.ForceClientDisconnect(
-		ctx,
-		ifaceName,
-		mac,
-		hostapd.Ieee80211ReasonCodeWlanReasonDisassocApBusy,
-	)
+	// List all network interfaces.
+	ifaces, err := netMgr.ListInterfaces(ctx)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "ForceClientDisconnect: %v\n", err)
-		os.Exit(1)
+		fmt.Fprintf(os.Stderr, "ListInterfaces: %v\n", err)
+	} else {
+		fmt.Printf("\nNetwork interfaces (%d):\n", len(ifaces))
+		for _, iface := range ifaces {
+			fmt.Printf("  %s\n", iface)
+		}
 	}
 
-	fmt.Printf("Disconnected client %x from %s\n", mac, ifaceName)
-}
-
-func cmdTerminate(
-	ctx context.Context,
-	ap *hostapd.HostapdProxy,
-) {
-	err := ap.Terminate(ctx)
+	// Check bandwidth control.
+	fmt.Println()
+	bwCtrl, err := netMgr.IsBandwidthControlEnabled(ctx)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Terminate: %v\n", err)
-		os.Exit(1)
+		fmt.Fprintf(os.Stderr, "IsBandwidthControlEnabled: %v\n", err)
+	} else {
+		fmt.Printf("Bandwidth control enabled: %v\n", bwCtrl)
 	}
 
-	fmt.Println("hostapd daemon terminated")
-}
-
-func hexToBytes(s string) ([]byte, error) {
-	if len(s)%2 != 0 {
-		return nil, fmt.Errorf("odd length hex string")
-	}
-	b := make([]byte, len(s)/2)
-	for i := range b {
-		_, err := fmt.Sscanf(s[2*i:2*i+2], "%02x", &b[i])
-		if err != nil {
-			return nil, err
-		}
+	// Check firewall status (requires AID_SYSTEM).
+	fwEnabled, err := netMgr.IsFirewallEnabled(ctx)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "IsFirewallEnabled: %v (requires AID_SYSTEM)\n", err)
+	} else {
+		fmt.Printf("Firewall enabled: %v\n", fwEnabled)
 	}
-	return b, nil
 }