[app] Add DoH (#122)

app/build.gradle

@@ -75,6 +75,7 @@ dependencies {
     implementation 'com.takisoft.preferencex:preferencex:1.1.0'
     implementation 'com.takisoft.preferencex:preferencex-colorpicker:1.1.0'
     implementation 'com.squareup.okhttp3:okhttp:4.9.0'
+    implementation 'com.squareup.okhttp3:okhttp-dnsoverhttps:4.9.0'
     final def markwon_version = '4.6.2'
     implementation "io.noties.markwon:core:$markwon_version"
     implementation "io.noties.markwon:ext-strikethrough:$markwon_version"

app/src/main/java/io/github/lsposed/manager/App.java

@@ -16,6 +16,7 @@ import java.io.StringWriter;
 
 import io.github.lsposed.manager.repo.RepoLoader;
 import io.github.lsposed.manager.ui.activity.CrashReportActivity;
+import io.github.lsposed.manager.util.DoHDNS;
 import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 
@@ -78,6 +79,7 @@ public class App extends Application {
         if (okHttpClient == null) {
             okHttpClient = new OkHttpClient.Builder()
                     .cache(getOkHttpCache())
+                    .dns(new DoHDNS())
                     .build();
         }
         return okHttpClient;

app/src/main/java/io/github/lsposed/manager/util/DoHDNS.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of LSPosed.
+ *
+ * LSPosed 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.
+ *
+ * LSPosed 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 LSPosed.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2020 EdXposed Contributors
+ * Copyright (C) 2021 LSPosed Contributors
+ */
+
+package io.github.lsposed.manager.util;
+
+import androidx.annotation.NonNull;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.List;
+
+import io.github.lsposed.manager.App;
+import okhttp3.Dns;
+import okhttp3.HttpUrl;
+import okhttp3.OkHttpClient;
+import okhttp3.dnsoverhttps.DnsOverHttps;
+
+public class DoHDNS implements Dns {
+
+    private static DnsOverHttps dnsOverHttps;
+
+    public DoHDNS() {
+        DnsOverHttps.Builder builder = new DnsOverHttps.Builder()
+                .client(new OkHttpClient.Builder().build())
+                .url(HttpUrl.get("https://cloudflare-dns.com/dns-query"));
+        try {
+            builder.bootstrapDnsHosts(InetAddress.getByName("162.159.36.1"),
+                    InetAddress.getByName("162.159.46.1"),
+                    InetAddress.getByName("1.1.1.1"),
+                    InetAddress.getByName("1.0.0.1"),
+                    InetAddress.getByName("162.159.132.53"),
+                    InetAddress.getByName("2606:4700:4700::1111"),
+                    InetAddress.getByName("2606:4700:4700::1001"),
+                    InetAddress.getByName("2606:4700:4700::0064"),
+                    InetAddress.getByName("2606:4700:4700::6400"));
+        } catch (UnknownHostException e) {
+            e.printStackTrace();
+        }
+        dnsOverHttps = builder.post(true).build();
+    }
+
+    @NonNull
+    @Override
+    public List<InetAddress> lookup(@NonNull String hostname) throws UnknownHostException {
+        if (App.getPreferences().getBoolean("doh", false)) {
+            List<InetAddress> inetAddresses = dnsOverHttps.lookup(hostname);
+            if (inetAddresses.size() > 0) {
+                return inetAddresses;
+            }
+        }
+        return SYSTEM.lookup(hostname);
+    }
+}

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

@@ -156,4 +156,7 @@
     <string name="module_information_collaborators">Collaborators</string>
     <string name="module_release_view_assets">Assets</string>
     <string name="menu_open_in_browser">Open in browser</string>
+    <string name="group_network">Network</string>
+    <string name="dns_over_http">DNS over HTTPS</string>
+    <string name="dns_over_http_summary">Workaround DNS poisoning in some nations</string>
 </resources>

app/src/main/res/xml/prefs.xml

@@ -1,6 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?><!--suppress ALL -->
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
+    <PreferenceCategory
+        android:key="group_network"
+        android:title="@string/group_network"
+        app:iconSpaceReserved="false">
+
+        <SwitchPreferenceCompat
+            android:defaultValue="false"
+            android:key="doh"
+            android:summary="@string/dns_over_http_summary"
+            android:title="@string/dns_over_http"
+            android:persistent="false"
+            app:iconSpaceReserved="false" />
+    </PreferenceCategory>
+
     <PreferenceCategory
         android:title="@string/settings_group_theme"
         app:iconSpaceReserved="false">