Implemented ServerTest

app/build.gradle

@@ -32,5 +32,6 @@ dependencies {
     compile 'com.android.support:appcompat-v7:25.3.1'
     compile 'com.android.support:design:25.3.1'
     compile 'com.android.support:support-v4:25.3.1'
+    compile "de.measite.minidns:minidns-hla:0.2.1"
     testCompile 'junit:junit:4.12'
 }

app/src/main/java/org/itxtech/daedalus/DnsServers.java

@@ -23,4 +23,17 @@ public class DnsServers {
                 return "123.206.61.167";
         }
     }
+
+    public static String getDnsServerAddress(int id) {
+        switch (id) {
+            case R.string.server_east_china:
+                return "120.27.103.230";
+            case R.string.server_north_china:
+                return "113.107.249.56";
+            case R.string.server_south_china:
+                return "123.206.61.167";
+            default:
+                return "123.206.61.167";
+        }
+    }
 }

app/src/main/java/org/itxtech/daedalus/ServerTestActivity.java

@@ -1,19 +1,42 @@
 package org.itxtech.daedalus;
 
+import android.os.Handler;
+import android.os.Message;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.View;
 import android.widget.Button;
+import android.widget.Spinner;
+import android.widget.TextView;
+import de.measite.minidns.DNSClient;
+import de.measite.minidns.DNSMessage;
+import de.measite.minidns.Question;
+import de.measite.minidns.Record;
+import de.measite.minidns.record.A;
+import de.measite.minidns.util.InetAddressUtil;
+
+import java.net.InetAddress;
+import java.util.*;
 
 public class ServerTestActivity extends AppCompatActivity {
+    private static final int MSG_DISPLAY_STATUS = 0;
+    private static final int MSG_TEST_DONE = 1;
 
+    private boolean testing = false;
+    private Thread mThread = null;
+    private Handler mHandler = null;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_server_test);
 
+        final TextView textViewTestInfo = (TextView) findViewById(R.id.textView_test_info);
+
+        final Spinner spinnerServerChoice = (Spinner) findViewById(R.id.spinner_server_choice);
+
         final Button startTestBut = (Button) findViewById(R.id.button_start_test);
         startTestBut.setOnClickListener(new View.OnClickListener() {
             @Override
@@ -21,12 +44,88 @@ public class ServerTestActivity extends AppCompatActivity {
                 Snackbar.make(v, R.string.start_test, Snackbar.LENGTH_LONG)
                         .setAction("Action", null).show();
                 startTestBut.setVisibility(View.INVISIBLE);
+
+                if (mThread == null) {
+                    Runnable runnable = new Runnable() {
+                        @Override
+                        public void run() {
+                            try {
+                                String testUrl = "www.google.com";
+                                String testText = "";
+                                String[] dnsServers = {"8.8.8.8", "114.114.114.114", DnsServers.getDnsServerAddress(spinnerServerChoice.getSelectedItem().toString())};
+                                DNSClient client = new DNSClient(null);
+                                for (String dnsServer : dnsServers) {
+                                    testText = testServer(client, dnsServer, testUrl, testText);
+                                }
+                                mHandler.obtainMessage(MSG_TEST_DONE).sendToTarget();
+                            } catch (Exception e) {
+                                Log.e("DVpn", e.toString());
+                            }
+                        }
+
+                        private String testServer(DNSClient client, String dnsServer, String testUrl, String testText) {
+                            try {
+                                Log.d("Dvpn", "Testing DNS " + dnsServer);
+                                testText += getResources().getString(R.string.test_server_address) + testUrl + "\n"
+                                        + getResources().getString(R.string.test_dns_server) + dnsServer;
+                                long startTime = System.currentTimeMillis();
+
+                                Question question = new Question(testUrl, Record.TYPE.getType(A.class));
+                                DNSMessage.Builder message = DNSMessage.builder();
+                                message.setQuestion(question);
+                                message.setId((new Random()).nextInt());
+                                message.setRecursionDesired(true);
+                                message.getEdnsBuilder().setUdpPayloadSize(1024).setDnssecOk(false);
+                                DNSMessage responseMessage = client.query(message.build(), InetAddressUtil.ipv4From(dnsServer));
+
+                                long endTime = System.currentTimeMillis();
+
+                                Set<A> answers = responseMessage.getAnswersFor(question);
+                                for (A a : answers) {
+                                    InetAddress inetAddress = a.getInetAddress();
+                                    testText += "\n" + getResources().getString(R.string.test_resolved_address) + inetAddress.getHostAddress();
+                                }
+                                testText += "\n" + getResources().getString(R.string.test_time_used) + String.valueOf(endTime - startTime) + " ms\n\n";
+
+                                mHandler.obtainMessage(MSG_DISPLAY_STATUS, testText).sendToTarget();
+
+                            } catch (Exception e) {
+                                Log.e("DVpn", e.toString());
+                            }
+                            return testText;
+                        }
+                    };
+                    mThread = new Thread(runnable);
+                    mThread.start();
+                }
             }
         });
+
+
+        mHandler = new Handler() {
+            public void handleMessage(Message msg) {
+                super.handleMessage(msg);
+
+                switch (msg.what) {
+                    case MSG_DISPLAY_STATUS:
+                        textViewTestInfo.setText((String) msg.obj);
+                        break;
+                    case MSG_TEST_DONE:
+                        testing = false;
+                        startTestBut.setVisibility(View.VISIBLE);
+                        mThread = null;
+                        break;
+                }
+            }
+        };
     }
 
     @Override
     protected void onRestart() {
         super.onRestart();
+        if (testing) {
+            final Button startTestBut = (Button) findViewById(R.id.button_start_test);
+            startTestBut.setVisibility(View.INVISIBLE);
+        }
     }
 }

app/src/main/res/layout-land/content_main.xml

@@ -24,7 +24,7 @@
             android:text="@string/notice"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:id="@+id/textView"
+            android:id="@+id/textView_notice"
             android:textSize="15sp"
             android:layout_marginTop="100dp"
             android:layout_alignParentTop="true" android:layout_centerHorizontal="true"/>

app/src/main/res/layout/activity_about.xml

@@ -19,7 +19,7 @@
                 android:text="@string/about"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:id="@+id/textView2"
+                android:id="@+id/textView_about"
                 android:textSize="20sp" android:layout_alignParentTop="true" android:layout_alignParentStart="true"/>
     </RelativeLayout>
 </ScrollView>

app/src/main/res/layout/activity_server_test.xml

@@ -14,12 +14,17 @@
     <Spinner
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:id="@+id/spinner" android:layout_alignParentTop="true"
+            android:id="@+id/spinner_server_choice" android:layout_alignParentTop="true"
             android:entries="@array/dns_server_options"/>
     <Button
             android:text="@string/action_start_test"
             android:layout_width="wrap_content"
-            android:layout_height="wrap_content" android:layout_below="@+id/spinner"
+            android:layout_height="wrap_content" android:layout_below="@+id/spinner_server_choice"
             android:layout_alignParentStart="true" android:layout_marginTop="20dp" android:id="@+id/button_start_test"
             android:layout_alignParentEnd="true"/>
+    <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" android:layout_below="@+id/button_start_test"
+            android:layout_alignParentStart="true" android:layout_marginTop="10dp" android:id="@+id/textView_test_info"
+            android:textSize="18sp"/>
 </RelativeLayout>

app/src/main/res/layout/content_main.xml

@@ -24,7 +24,7 @@
             android:text="@string/notice"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:id="@+id/textView"
+            android:id="@+id/textView_notice"
             android:textAppearance="@android:style/TextAppearance.Material" android:fontFamily="sans-serif"
             android:layout_above="@+id/button_activate"
             android:layout_centerHorizontal="true"

app/src/main/res/values-zh/strings.xml

@@ -22,7 +22,11 @@
     <string name="server_east_china">华东</string>
     <string name="server_north_china">华北</string>
     <string name="secondary_server">备用 DNS 服务器</string>
-    <string name="start_test">正在开始测试 DNS 服务器</string>
+    <string name="start_test">正在测试指定的 DNS 服务器</string>
     <string name="action_server_test">测试服务器</string>
     <string name="action_start_test">开始测试</string>
+    <string name="test_server_address">测试服务器：</string>
+    <string name="test_time_used">耗时：</string>
+    <string name="test_dns_server">DNS 服务器：</string>
+    <string name="test_resolved_address">解析的地址：</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -23,7 +23,11 @@
     <string name="server_east_china">East China</string>
     <string name="server_north_china">North China</string>
     <string name="secondary_server">Secondary DNS server</string>
-    <string name="start_test">Starting to test DNS server</string>
+    <string name="start_test">Testing specified DNS server</string>
     <string name="action_server_test">Server test</string>
     <string name="action_start_test">Start test</string>
+    <string name="test_server_address">Test server address:</string>
+    <string name="test_time_used">Time used:</string>
+    <string name="test_dns_server">DNS server:</string>
+    <string name="test_resolved_address">Resolved address:</string>
 </resources>