send all dns server to core

Author: wwqgtxx

core/src/main/java/com/github/kr328/clash/core/Clash.kt

@@ -49,7 +49,7 @@ object Clash {
     }
 
     fun notifyDnsChanged(dns: List<String>) {
-        Bridge.nativeNotifyDnsChanged(dns.joinToString(separator = ","))
+        Bridge.nativeNotifyDnsChanged(dns.toSet().joinToString(separator = ","))
     }
 
     fun notifyTimeZoneChanged(name: String, offset: Int) {

service/src/main/java/com/github/kr328/clash/service/clash/module/NetworkObserveModule.kt

@@ -6,7 +6,7 @@ import android.os.Build
 import androidx.core.content.getSystemService
 import com.github.kr328.clash.common.log.Log
 import com.github.kr328.clash.core.Clash
-import com.github.kr328.clash.service.util.resolvePrimaryDns
+import com.github.kr328.clash.service.util.resolveDns
 import kotlinx.coroutines.NonCancellable
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.channels.trySendBlocking
@@ -69,8 +69,8 @@ class NetworkObserveModule(service: Service) : Module<Network?>(service) {
                     }
                 }
 
-                val dns = networks.mapNotNull {
-                    connectivity.resolvePrimaryDns(it)
+                val dns = networks.flatMap { network ->
+                    connectivity?.resolveDns(network) ?: emptyList()
                 }
 
                 Clash.notifyDnsChanged(dns)

service/src/main/java/com/github/kr328/clash/service/util/Connectivity.kt

@@ -3,8 +3,7 @@ package com.github.kr328.clash.service.util
 import android.net.ConnectivityManager
 import android.net.Network
 
-fun ConnectivityManager.resolvePrimaryDns(network: Network?): String? {
-    val properties = getLinkProperties(network) ?: return null
-
-    return properties.dnsServers.firstOrNull()?.asSocketAddressText(53)
+fun ConnectivityManager.resolveDns(network: Network?): List<String> {
+    val properties = getLinkProperties(network) ?: return listOf()
+    return properties.dnsServers.map { it.asSocketAddressText(53) }
 }