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SMB device discovery strategy using mDNS/NsdManager #4536
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156 changes: 156 additions & 0 deletions
156
app/src/main/java/com/amaze/filemanager/utils/smb/NsdManagerDiscoverDeviceStrategy.kt
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (C) 2014-2024 Arpit Khurana <arpitkh96@gmail.com>, Vishal Nehra <vishalmeham2@gmail.com>, | ||
| * Emmanuel Messulam<emmanuelbendavid@gmail.com>, Raymond Lai <airwave209gt at gmail.com> and Contributors. | ||
| * | ||
| * This file is part of Amaze File Manager. | ||
| * | ||
| * Amaze File Manager is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
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| package com.amaze.filemanager.utils.smb | ||
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| import android.content.Context.NSD_SERVICE | ||
| import android.content.Context.WIFI_SERVICE | ||
| import android.net.nsd.NsdManager | ||
| import android.net.nsd.NsdServiceInfo | ||
| import android.net.wifi.WifiManager | ||
| import android.os.Build.VERSION.SDK_INT | ||
| import android.os.Build.VERSION_CODES.UPSIDE_DOWN_CAKE | ||
| import com.amaze.filemanager.application.AppConfig | ||
| import com.amaze.filemanager.utils.ComputerParcelable | ||
| import org.slf4j.Logger | ||
| import org.slf4j.LoggerFactory | ||
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| /** | ||
| * [SmbDeviceScannerObservable.DiscoverDeviceStrategy] implementation using Android's | ||
| * [NsdManager] to discover SMB devices using mDNS/Bonjour/ZeroConf. | ||
| * | ||
| * @see SmbDeviceScannerObservable | ||
| * @see NsdManager | ||
| * | ||
| */ | ||
| class NsdManagerDiscoverDeviceStrategy : SmbDeviceScannerObservable.DiscoverDeviceStrategy { | ||
| companion object { | ||
| internal const val SERVICE_TYPE_SMB = "_smb._tcp." | ||
| private val logger: Logger = | ||
| LoggerFactory.getLogger(NsdManagerDiscoverDeviceStrategy::class.java) | ||
| } | ||
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| private val wifiManager: WifiManager = | ||
| AppConfig.getInstance().applicationContext.getSystemService(WIFI_SERVICE) as WifiManager | ||
| private val nsdManager: NsdManager = | ||
| AppConfig.getInstance().applicationContext.getSystemService(NSD_SERVICE) as NsdManager | ||
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| private var multicastLock: WifiManager.MulticastLock? = null | ||
| private var discoveryListener: NsdManager.DiscoveryListener? = null | ||
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| override fun discoverDevices(callback: (ComputerParcelable) -> Unit) { | ||
| multicastLock = | ||
| wifiManager.createMulticastLock("smb_mdns_discovery").apply { | ||
| setReferenceCounted(true) | ||
| } | ||
| multicastLock?.acquire() | ||
| discoveryListener = createDiscoveryListener(callback) | ||
| nsdManager.discoverServices( | ||
| SERVICE_TYPE_SMB, | ||
| NsdManager.PROTOCOL_DNS_SD, | ||
| discoveryListener, | ||
| ) | ||
| } | ||
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| override fun onCancel() { | ||
| discoveryListener?.let { | ||
| nsdManager.stopServiceDiscovery(it) | ||
| discoveryListener = null | ||
| } | ||
| multicastLock?.let { | ||
| if (it.isHeld) { | ||
| it.release() | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Creates a new [NsdManager.DiscoveryListener] to handle service discovery events. | ||
| * | ||
| * For backward compatibility, uses [NsdManager.ResolveListener] to resolve services | ||
| * and perform the callback. | ||
| */ | ||
| private fun createDiscoveryListener(callback: (ComputerParcelable) -> Unit): NsdManager.DiscoveryListener { | ||
| return object : NsdManager.DiscoveryListener { | ||
| override fun onServiceFound(serviceInfo: NsdServiceInfo) { | ||
| // Just to be sure. | ||
| if (serviceInfo.serviceType != SERVICE_TYPE_SMB) { | ||
| logger.warn("Unknown Service Type: ${serviceInfo.serviceType} for service: ${serviceInfo.serviceName}") | ||
| } else { | ||
| @Suppress("DEPRECATION") | ||
| nsdManager.resolveService( | ||
| serviceInfo, | ||
| object : NsdManager.ResolveListener { | ||
| override fun onServiceResolved(resolvedServiceInfo: NsdServiceInfo) { | ||
| val host = | ||
| if (SDK_INT >= UPSIDE_DOWN_CAKE) { | ||
| resolvedServiceInfo.hostAddresses.firstOrNull() | ||
| } else { | ||
| resolvedServiceInfo.host | ||
| } | ||
| if (host != null && host.hostAddress?.isNotEmpty() == true) { | ||
| val computer = | ||
| ComputerParcelable( | ||
| name = resolvedServiceInfo.serviceName, | ||
| addr = host.hostAddress!!, | ||
| ) | ||
| callback(computer) | ||
| } | ||
| } | ||
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| override fun onResolveFailed( | ||
| serviceInfo: NsdServiceInfo?, | ||
| errorCode: Int, | ||
| ) { | ||
| logger.error( | ||
| "Service resolve failed: ${serviceInfo?.serviceName} with error code: $errorCode", | ||
| ) | ||
| } | ||
| }, | ||
| ) | ||
| } | ||
| } | ||
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| override fun onServiceLost(serviceInfo: NsdServiceInfo?) { | ||
| logger.debug("Service lost: ${serviceInfo?.serviceName}") | ||
| } | ||
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| override fun onStartDiscoveryFailed( | ||
| serviceType: String, | ||
| errorCode: Int, | ||
| ) { | ||
| logger.error("Service discovery start failed: $serviceType with error code: $errorCode") | ||
| nsdManager.stopServiceDiscovery(this) | ||
| } | ||
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| override fun onStopDiscoveryFailed( | ||
| serviceType: String, | ||
| errorCode: Int, | ||
| ) { | ||
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|
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| logger.debug("Service discovery stop failed: $serviceType with error code: $errorCode") | ||
| nsdManager.stopServiceDiscovery(this) | ||
| } | ||
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| override fun onDiscoveryStarted(serviceType: String?) = logger.debug("Service discovery started: $serviceType") | ||
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| override fun onDiscoveryStopped(serviceType: String?) = logger.debug("Service discovery stopped: $serviceType") | ||
| } | ||
| } | ||
| } | ||
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