tunnel: implement http proxy for Android 10+

Allow getting package names of tv apps.

5 files changed, 1057 insertions, 7 deletions

diff --git a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
index 1338a1b6..14d6c53f 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -7,10 +7,14 @@ package com.wireguard.android.backend;
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
 import android.net.LocalSocketAddress;
 import android.net.ProxyInfo;
+import android.net.Uri;
 import android.os.Build;
 import android.os.ParcelFileDescriptor;
+import android.os.Process;
 import android.system.OsConstants;
 import android.util.Log;
 
@@ -20,11 +24,19 @@ import com.google.protobuf.Empty;
 
 import com.wireguard.android.backend.BackendException.Reason;
 import com.wireguard.android.backend.Tunnel.State;
+import com.wireguard.android.backend.gen.GetConnectionOwnerUidResponse;
 import com.wireguard.android.backend.gen.LibwgGrpc;
+import com.wireguard.android.backend.gen.ReverseRequest;
+import com.wireguard.android.backend.gen.ReverseResponse;
+import com.wireguard.android.backend.gen.StartHttpProxyRequest;
+import com.wireguard.android.backend.gen.StartHttpProxyResponse;
+import com.wireguard.android.backend.gen.StopHttpProxyRequest;
+import com.wireguard.android.backend.gen.StopHttpProxyResponse;
 import com.wireguard.android.backend.gen.VersionRequest;
 import com.wireguard.android.backend.gen.VersionResponse;
 import com.wireguard.android.util.SharedLibraryLoader;
 import com.wireguard.config.Config;
+import com.wireguard.config.HttpProxy;
 import com.wireguard.config.InetEndpoint;
 import com.wireguard.config.InetNetwork;
 import com.wireguard.config.Peer;
@@ -36,17 +48,29 @@ import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
 import io.grpc.android.UdsChannelBuilder;
 import io.grpc.okhttp.OkHttpChannelBuilder;
+import io.grpc.stub.StreamObserver;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
 import java.net.InetAddress;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetSocketAddress;
+import java.net.UnknownHostException;
 import java.net.URL;
+import java.nio.ByteOrder;
 import java.util.Collections;
+import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.FutureTask;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicReference;
 
 import javax.net.SocketFactory;
 
@@ -68,6 +92,7 @@ public final class GoBackend implements Backend {
     @Nullable private Tunnel currentTunnel;
     private int currentTunnelHandle = -1;
     private ManagedChannel channel;
+    private ConnectivityManager connectivityManager;
 
     /**
      * Public constructor for GoBackend.
@@ -77,7 +102,7 @@ public final class GoBackend implements Backend {
     public GoBackend(final Context context) {
         SharedLibraryLoader.loadSharedLibrary(context, "wg-go");
         this.context = context;
-
+        connectivityManager = context.getSystemService(ConnectivityManager.class);
         File socketFile = new File(context.getCacheDir(), "libwg.sock");
         String socketName = socketFile.getAbsolutePath();
         Log.i(TAG, "wgStartGrpc: " + wgStartGrpc(socketName));
@@ -234,6 +259,130 @@ public final class GoBackend implements Backend {
         return getState(tunnel);
     }
 
+    private int startHttpProxy(Uri pacFileUrl) {
+        LibwgGrpc.LibwgStub asyncStub = LibwgGrpc.newStub(channel);
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+        StartHttpProxyRequest.Builder reqBuilder = StartHttpProxyRequest.newBuilder();
+        if (pacFileUrl != null && pacFileUrl != Uri.EMPTY) {
+            reqBuilder.setPacFileUrl(pacFileUrl.toString());
+        }
+
+        Thread streamer = new Thread(new Runnable() {
+            public void run() {
+                try {
+                    Log.i(TAG, "Before streamReverse");
+                    streamReverse(asyncStub);
+                    Log.i(TAG, "After streamReverse");
+                } catch (InterruptedException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        });
+
+        StartHttpProxyRequest req = reqBuilder.build();
+        StartHttpProxyResponse resp = stub.startHttpProxy(req);
+        Log.i(TAG, "Start http proxy listen_port:" + resp.getListenPort() + ", error:" + resp.getError().getMessage());
+        streamer.start();
+        return resp.getListenPort();
+    }
+
+    private void stopHttpProxy() {
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+        StopHttpProxyRequest req = StopHttpProxyRequest.newBuilder().build();
+        StopHttpProxyResponse resp = stub.stopHttpProxy(req);
+        Log.i(TAG, "Stop http proxy: " + resp.getError().getMessage());
+    }
+
+    private static InetSocketAddress toInetSocketAddress(com.wireguard.android.backend.gen.InetSocketAddress sockAddr) {
+        try {
+            return new InetSocketAddress(InetAddress.getByAddress(sockAddr.getAddress().getAddress().toByteArray()), sockAddr.getPort());
+        } catch (UnknownHostException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private int getConnectionOwnerUid(int protocol, InetSocketAddress local, InetSocketAddress remote) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
+            return connectivityManager.getConnectionOwnerUid(protocol, local, remote);
+        else
+            return Process.INVALID_UID;
+    }
+
+    private void streamReverse(LibwgGrpc.LibwgStub asyncStub) throws InterruptedException {
+        Log.i(TAG, "In streamReverse");
+        final CountDownLatch finishLatch = new CountDownLatch(1);
+        final AtomicReference<StreamObserver<ReverseRequest>> atomicRequestObserver = new AtomicReference<StreamObserver<ReverseRequest>>();
+        // Throwable failed = null;
+
+        StreamObserver<ReverseResponse> responseObserver = new StreamObserver<ReverseResponse>() {
+                @Override
+                public void onNext(ReverseResponse resp) {
+                    try {
+                    String pkg = "";
+                    int uid = getConnectionOwnerUid(resp.getUid().getProtocol(), toInetSocketAddress(resp.getUid().getLocal()), toInetSocketAddress(resp.getUid().getRemote()));
+                    if (uid != Process.INVALID_UID) {
+                        PackageManager pm = context.getPackageManager();
+                        pkg = pm.getNameForUid(uid);
+                        String[] pkgs = pm.getPackagesForUid(uid);
+                        Log.i(TAG, "reverse onNext uid:" + uid + " package:" + pkg);
+                        if (pkgs != null) {
+                            for (int i=0; i < pkgs.length; i++) {
+                                Log.i(TAG, "getPackagesForUid() = " + pkgs[i]);
+                            }
+                        }
+                    } else {
+                        Log.i(TAG, "Connection not found");
+                    }
+
+                    ReverseRequest req = ReverseRequest.newBuilder()
+                    .setUid(GetConnectionOwnerUidResponse.newBuilder()
+                            .setUid(uid)
+                            .setPackage(pkg != null ? pkg: "")
+                            .build())
+                    .build();
+
+                    io.grpc.Context.current().fork().run(new Runnable() {
+                            public void run() {
+                                atomicRequestObserver.get().onNext(req);
+                            }
+                        });
+                    } catch (RuntimeException ex) {
+                        Log.i(TAG, "onNext " + ex);
+                        throw ex;
+                    }
+                }
+
+                @Override
+                public void onError(Throwable t) {
+                    // failed = t;
+                    Log.i(TAG, "streamReverse error: " + t);
+                    finishLatch.countDown();
+                }
+
+                @Override
+                public void onCompleted() {
+                    Log.i(TAG, "streamReverse completed");
+                    finishLatch.countDown();
+                }
+            };
+        StreamObserver<ReverseRequest> requestObserver = asyncStub.reverse(responseObserver);
+        atomicRequestObserver.set(requestObserver);
+
+        // Mark the end of requests
+        //requestObserver.onCompleted();
+
+        //requestObserver.onNext(ReverseRequest.getDefaultInstance());
+
+        Log.i(TAG, "Waiting streamReverse");
+        // Receiving happens asynchronously
+        finishLatch.await();
+
+        // if (failed != null) {
+        //     throw new RuntimeException(failed);
+        // }
+        Log.i(TAG, "Exit streamReverse");
+    }
+
     private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state)
             throws Exception {
         Log.i(TAG, "Bringing tunnel " + tunnel.getName() + ' ' + state);
@@ -328,8 +477,20 @@ public final class GoBackend implements Backend {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
                 service.setUnderlyingNetworks(null);
 
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-                config.getInterface().getHttpProxy().ifPresent(pi -> builder.setHttpProxy(pi.getProxyInfo()));
+            Optional<HttpProxy> proxy = config.getInterface().getHttpProxy();
+            if (proxy.isPresent()) {
+                ProxyInfo pi = proxy.get().getProxyInfo();
+                Uri pacFileUrl = pi.getPacFileUrl();
+
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                    if (pacFileUrl != null && pacFileUrl != Uri.EMPTY) {
+                        int listenPort = startHttpProxy(pacFileUrl);
+                        ProxyInfo localPi = ProxyInfo.buildDirectProxy("localhost", listenPort);
+                        builder.setHttpProxy(localPi);
+                    } else {
+                        builder.setHttpProxy(pi);
+                    }
+                }
             }
 
             builder.setBlocking(true);
@@ -356,6 +517,7 @@ public final class GoBackend implements Backend {
             currentTunnel = null;
             currentTunnelHandle = -1;
             currentConfig = null;
+            stopHttpProxy();
             wgTurnOff(handleToClose);
         }
 
@@ -418,6 +580,7 @@ public final class GoBackend implements Backend {
         @Override
         public void onDestroy() {
             if (owner != null) {
+                owner.stopHttpProxy();
                 final Tunnel tunnel = owner.currentTunnel;
                 if (tunnel != null) {
                     if (owner.currentTunnelHandle != -1)
diff --git a/tunnel/src/main/proto/libwg.proto b/tunnel/src/main/proto/libwg.proto
index 2d964897..977dacdd 100644
--- a/tunnel/src/main/proto/libwg.proto
+++ b/tunnel/src/main/proto/libwg.proto
@@ -11,6 +11,31 @@ package api;
 service Libwg {
 	rpc StopGrpc(StopGrpcRequest) returns (StopGrpcResponse);
 	rpc Version(VersionRequest) returns (VersionResponse);
+	rpc StartHttpProxy(StartHttpProxyRequest) returns (StartHttpProxyResponse);
+	rpc StopHttpProxy(StopHttpProxyRequest) returns (StopHttpProxyResponse);
+	rpc Reverse(stream ReverseRequest) returns (stream ReverseResponse);
+}
+
+message TunnelHandle { int32 handle = 1; }
+
+message Error {
+	enum Code {
+		NO_ERROR = 0;
+		UNSPECIFIED = 1;
+		INVALID_PROTOCOL_BUFFER = 2;
+		INVALID_RESPONSE = 3;
+	}
+	Code code = 1;
+	string message = 2;
+}
+
+message InetAddress {
+	bytes address = 1;
+}
+
+message InetSocketAddress {
+	InetAddress address = 1;
+	uint32 port = 2;
 }
 
 message StopGrpcRequest {
@@ -25,3 +50,44 @@ message VersionRequest {
 message VersionResponse {
 	string version = 1;
 }
+
+message StartHttpProxyRequest {
+	string pacFileUrl = 1;
+}
+
+message StartHttpProxyResponse {
+	uint32 listen_port = 1;
+	Error error = 2;
+}
+
+message StopHttpProxyRequest {
+}
+
+message StopHttpProxyResponse {
+	Error error = 1;
+}
+
+message ReverseRequest {
+	oneof response {
+		GetConnectionOwnerUidResponse uid = 1;
+	}
+}
+
+message ReverseResponse {
+	oneof request {
+		GetConnectionOwnerUidRequest uid = 1;
+	}
+}
+
+message GetConnectionOwnerUidRequest {
+	// ConnectivityManager.getConnectionOwnerUid(int protocol,
+	//     InetSocketAddress local, InetSocketAddress remote)
+	int32 protocol = 1;
+	InetSocketAddress local = 2;
+	InetSocketAddress remote = 3;
+}
+
+message GetConnectionOwnerUidResponse {
+	int32 uid = 1;
+	string package = 2; // context.getPackageManager().getNameForUid()
+}
diff --git a/tunnel/tools/libwg-go/Makefile b/tunnel/tools/libwg-go/Makefile
index 6c47c2d7..adebb555 100644
--- a/tunnel/tools/libwg-go/Makefile
+++ b/tunnel/tools/libwg-go/Makefile
@@ -70,7 +70,7 @@ gen/%_grpc.pb.go: $(PROTODIR)/%.proto $(BUILDDIR)/go-$(GO_VERSION)/.prepared $(P
 	$(PROTOC) -I $(PROTODIR) -I $(PROTO_INCLUDEDIR) --go-grpc_out=./gen --go-grpc_opt=paths=source_relative $<
 
 $(DESTDIR)/libwg-go.so: export PATH := $(BUILDDIR)/go-$(GO_VERSION)/bin/:$(PATH)
-$(DESTDIR)/libwg-go.so: $(BUILDDIR)/go-$(GO_VERSION)/.prepared go.mod api-android.go service.go gen/libwg.pb.go gen/libwg_grpc.pb.go jni.c
+$(DESTDIR)/libwg-go.so: $(BUILDDIR)/go-$(GO_VERSION)/.prepared go.mod api-android.go http-proxy.go service.go gen/libwg.pb.go gen/libwg_grpc.pb.go jni.c
 	go build -tags linux -ldflags="-X golang.zx2c4.com/wireguard/ipc.socketDirectory=/data/data/$(ANDROID_PACKAGE_NAME)/cache/wireguard" -v -trimpath -o "$@" -buildmode c-shared
 
 .DELETE_ON_ERROR:
diff --git a/tunnel/tools/libwg-go/http-proxy.go b/tunnel/tools/libwg-go/http-proxy.go
new file mode 100644
index 00000000..c73e1edf
--- /dev/null
+++ b/tunnel/tools/libwg-go/http-proxy.go
@@ -0,0 +1,678 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/netip"
+	"net/url"
+	"strings"
+	"sync"
+
+	"github.com/elazarl/goproxy"
+
+	"golang.zx2c4.com/wireguard/device"
+
+	"gopkg.in/olebedev/go-duktape.v3"
+)
+
+const (
+	// Imported from Firefox' ProxyAutoConfig.cpp
+	// https://searchfox.org/mozilla-central/source/netwerk/base/ProxyAutoConfig.cpp
+	// This Source Code Form is subject to the terms of the Mozilla Public
+	// License, v. 2.0. If a copy of the MPL was not distributed with this
+	// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+	ASCII_PAC_UTILS = "function dnsDomainIs(host, domain) {\n" +
+		"    return (host.length >= domain.length &&\n" +
+		"            host.substring(host.length - domain.length) == domain);\n" +
+		"}\n" +
+		"" +
+		"function dnsDomainLevels(host) {\n" +
+		"    return host.split('.').length - 1;\n" +
+		"}\n" +
+		"" +
+		"function isValidIpAddress(ipchars) {\n" +
+		"    var matches = " +
+		"/^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$/.exec(ipchars);\n" +
+		"    if (matches == null) {\n" +
+		"        return false;\n" +
+		"    } else if (matches[1] > 255 || matches[2] > 255 || \n" +
+		"               matches[3] > 255 || matches[4] > 255) {\n" +
+		"        return false;\n" +
+		"    }\n" +
+		"    return true;\n" +
+		"}\n" +
+		"" +
+		"function convert_addr(ipchars) {\n" +
+		"    var bytes = ipchars.split('.');\n" +
+		"    var result = ((bytes[0] & 0xff) << 24) |\n" +
+		"                 ((bytes[1] & 0xff) << 16) |\n" +
+		"                 ((bytes[2] & 0xff) <<  8) |\n" +
+		"                  (bytes[3] & 0xff);\n" +
+		"    return result;\n" +
+		"}\n" +
+		"" +
+		"function isInNet(ipaddr, pattern, maskstr) {\n" +
+		"    if (!isValidIpAddress(pattern) || !isValidIpAddress(maskstr)) {\n" +
+		"        return false;\n" +
+		"    }\n" +
+		"    if (!isValidIpAddress(ipaddr)) {\n" +
+		"        ipaddr = dnsResolve(ipaddr);\n" +
+		"        if (ipaddr == null) {\n" +
+		"            return false;\n" +
+		"        }\n" +
+		"    }\n" +
+		"    var host = convert_addr(ipaddr);\n" +
+		"    var pat  = convert_addr(pattern);\n" +
+		"    var mask = convert_addr(maskstr);\n" +
+		"    return ((host & mask) == (pat & mask));\n" +
+		"    \n" +
+		"}\n" +
+		"" +
+		"function isPlainHostName(host) {\n" +
+		"    return (host.search('(\\\\.)|:') == -1);\n" +
+		"}\n" +
+		"" +
+		"function isResolvable(host) {\n" +
+		"    var ip = dnsResolve(host);\n" +
+		"    return (ip != null);\n" +
+		"}\n" +
+		"" +
+		"function localHostOrDomainIs(host, hostdom) {\n" +
+		"    return (host == hostdom) ||\n" +
+		"           (hostdom.lastIndexOf(host + '.', 0) == 0);\n" +
+		"}\n" +
+		"" +
+		"function shExpMatch(url, pattern) {\n" +
+		"   pattern = pattern.replace(/\\./g, '\\\\.');\n" +
+		"   pattern = pattern.replace(/\\*/g, '.*');\n" +
+		"   pattern = pattern.replace(/\\?/g, '.');\n" +
+		"   var newRe = new RegExp('^'+pattern+'$');\n" +
+		"   return newRe.test(url);\n" +
+		"}\n" +
+		"" +
+		"var wdays = {SUN: 0, MON: 1, TUE: 2, WED: 3, THU: 4, FRI: 5, SAT: 6};\n" +
+		"var months = {JAN: 0, FEB: 1, MAR: 2, APR: 3, MAY: 4, JUN: 5, JUL: 6, " +
+		"AUG: 7, SEP: 8, OCT: 9, NOV: 10, DEC: 11};\n" +
+		"" +
+		"function weekdayRange() {\n" +
+		"    function getDay(weekday) {\n" +
+		"        if (weekday in wdays) {\n" +
+		"            return wdays[weekday];\n" +
+		"        }\n" +
+		"        return -1;\n" +
+		"    }\n" +
+		"    var date = new Date();\n" +
+		"    var argc = arguments.length;\n" +
+		"    var wday;\n" +
+		"    if (argc < 1)\n" +
+		"        return false;\n" +
+		"    if (arguments[argc - 1] == 'GMT') {\n" +
+		"        argc--;\n" +
+		"        wday = date.getUTCDay();\n" +
+		"    } else {\n" +
+		"        wday = date.getDay();\n" +
+		"    }\n" +
+		"    var wd1 = getDay(arguments[0]);\n" +
+		"    var wd2 = (argc == 2) ? getDay(arguments[1]) : wd1;\n" +
+		"    return (wd1 == -1 || wd2 == -1) ? false\n" +
+		"                                    : (wd1 <= wd2) ? (wd1 <= wday && wday " +
+		"<= wd2)\n" +
+		"                                                   : (wd2 >= wday || wday " +
+		">= wd1);\n" +
+		"}\n" +
+		"" +
+		"function dateRange() {\n" +
+		"    function getMonth(name) {\n" +
+		"        if (name in months) {\n" +
+		"            return months[name];\n" +
+		"        }\n" +
+		"        return -1;\n" +
+		"    }\n" +
+		"    var date = new Date();\n" +
+		"    var argc = arguments.length;\n" +
+		"    if (argc < 1) {\n" +
+		"        return false;\n" +
+		"    }\n" +
+		"    var isGMT = (arguments[argc - 1] == 'GMT');\n" +
+		"\n" +
+		"    if (isGMT) {\n" +
+		"        argc--;\n" +
+		"    }\n" +
+		"    // function will work even without explict handling of this case\n" +
+		"    if (argc == 1) {\n" +
+		"        var tmp = parseInt(arguments[0]);\n" +
+		"        if (isNaN(tmp)) {\n" +
+		"            return ((isGMT ? date.getUTCMonth() : date.getMonth()) ==\n" +
+		"                     getMonth(arguments[0]));\n" +
+		"        } else if (tmp < 32) {\n" +
+		"            return ((isGMT ? date.getUTCDate() : date.getDate()) == " +
+		"tmp);\n" +
+		"        } else { \n" +
+		"            return ((isGMT ? date.getUTCFullYear() : date.getFullYear()) " +
+		"==\n" +
+		"                     tmp);\n" +
+		"        }\n" +
+		"    }\n" +
+		"    var year = date.getFullYear();\n" +
+		"    var date1, date2;\n" +
+		"    date1 = new Date(year,  0,  1,  0,  0,  0);\n" +
+		"    date2 = new Date(year, 11, 31, 23, 59, 59);\n" +
+		"    var adjustMonth = false;\n" +
+		"    for (var i = 0; i < (argc >> 1); i++) {\n" +
+		"        var tmp = parseInt(arguments[i]);\n" +
+		"        if (isNaN(tmp)) {\n" +
+		"            var mon = getMonth(arguments[i]);\n" +
+		"            date1.setMonth(mon);\n" +
+		"        } else if (tmp < 32) {\n" +
+		"            adjustMonth = (argc <= 2);\n" +
+		"            date1.setDate(tmp);\n" +
+		"        } else {\n" +
+		"            date1.setFullYear(tmp);\n" +
+		"        }\n" +
+		"    }\n" +
+		"    for (var i = (argc >> 1); i < argc; i++) {\n" +
+		"        var tmp = parseInt(arguments[i]);\n" +
+		"        if (isNaN(tmp)) {\n" +
+		"            var mon = getMonth(arguments[i]);\n" +
+		"            date2.setMonth(mon);\n" +
+		"        } else if (tmp < 32) {\n" +
+		"            date2.setDate(tmp);\n" +
+		"        } else {\n" +
+		"            date2.setFullYear(tmp);\n" +
+		"        }\n" +
+		"    }\n" +
+		"    if (adjustMonth) {\n" +
+		"        date1.setMonth(date.getMonth());\n" +
+		"        date2.setMonth(date.getMonth());\n" +
+		"    }\n" +
+		"    if (isGMT) {\n" +
+		"    var tmp = date;\n" +
+		"        tmp.setFullYear(date.getUTCFullYear());\n" +
+		"        tmp.setMonth(date.getUTCMonth());\n" +
+		"        tmp.setDate(date.getUTCDate());\n" +
+		"        tmp.setHours(date.getUTCHours());\n" +
+		"        tmp.setMinutes(date.getUTCMinutes());\n" +
+		"        tmp.setSeconds(date.getUTCSeconds());\n" +
+		"        date = tmp;\n" +
+		"    }\n" +
+		"    return (date1 <= date2) ? (date1 <= date) && (date <= date2)\n" +
+		"                            : (date2 >= date) || (date >= date1);\n" +
+		"}\n" +
+		"" +
+		"function timeRange() {\n" +
+		"    var argc = arguments.length;\n" +
+		"    var date = new Date();\n" +
+		"    var isGMT= false;\n" +
+		"" +
+		"    if (argc < 1) {\n" +
+		"        return false;\n" +
+		"    }\n" +
+		"    if (arguments[argc - 1] == 'GMT') {\n" +
+		"        isGMT = true;\n" +
+		"        argc--;\n" +
+		"    }\n" +
+		"\n" +
+		"    var hour = isGMT ? date.getUTCHours() : date.getHours();\n" +
+		"    var date1, date2;\n" +
+		"    date1 = new Date();\n" +
+		"    date2 = new Date();\n" +
+		"\n" +
+		"    if (argc == 1) {\n" +
+		"        return (hour == arguments[0]);\n" +
+		"    } else if (argc == 2) {\n" +
+		"        return ((arguments[0] <= hour) && (hour <= arguments[1]));\n" +
+		"    } else {\n" +
+		"        switch (argc) {\n" +
+		"        case 6:\n" +
+		"            date1.setSeconds(arguments[2]);\n" +
+		"            date2.setSeconds(arguments[5]);\n" +
+		"        case 4:\n" +
+		"            var middle = argc >> 1;\n" +
+		"            date1.setHours(arguments[0]);\n" +
+		"            date1.setMinutes(arguments[1]);\n" +
+		"            date2.setHours(arguments[middle]);\n" +
+		"            date2.setMinutes(arguments[middle + 1]);\n" +
+		"            if (middle == 2) {\n" +
+		"                date2.setSeconds(59);\n" +
+		"            }\n" +
+		"            break;\n" +
+		"        default:\n" +
+		"          throw 'timeRange: bad number of arguments'\n" +
+		"        }\n" +
+		"    }\n" +
+		"\n" +
+		"    if (isGMT) {\n" +
+		"        date.setFullYear(date.getUTCFullYear());\n" +
+		"        date.setMonth(date.getUTCMonth());\n" +
+		"        date.setDate(date.getUTCDate());\n" +
+		"        date.setHours(date.getUTCHours());\n" +
+		"        date.setMinutes(date.getUTCMinutes());\n" +
+		"        date.setSeconds(date.getUTCSeconds());\n" +
+		"    }\n" +
+		"    return (date1 <= date2) ? (date1 <= date) && (date <= date2)\n" +
+		"                            : (date2 >= date) || (date >= date1);\n" +
+		"\n" +
+		"}\n"
+)
+
+type HttpProxy struct {
+	listener net.Listener
+	tlsListener net.Listener
+	logger *device.Logger
+	addrPort netip.AddrPort
+	tlsAddrPort netip.AddrPort
+	ctx *duktape.Context
+	defaultProxy *goproxy.ProxyHttpServer
+	uidRequest chan UidRequest
+	handlers []*HttpHandler
+}
+
+func NewHttpProxy(uidRequest chan UidRequest, logger *device.Logger) *HttpProxy {
+	logger.Verbosef("NewHttpProxy")
+	return &HttpProxy{
+		listener: nil,
+		logger: logger,
+		uidRequest: uidRequest,
+		handlers: make([]*HttpHandler, 0, 2),
+	}
+}
+
+var (
+	ASCII_PAC_UTILS_NAMES = []string{"dnsDomainIs", "dnsDomainLevels", "isValidIpAddress", "convert_addr", "isInNet", "isPlainHostName", "isResolvable", "localHostOrDomainIs", "shExpMatch", "weekdayRange", "dateRange", "timeRange"}
+)
+
+func (p *HttpProxy) GetAddrPort() netip.AddrPort {
+	return p.addrPort
+}
+
+type Logger struct {
+	logger *device.Logger
+}
+
+func (l *Logger) Printf(format string, v ...interface{}) {
+	l.logger.Verbosef(format, v...)
+}
+
+func (p *HttpProxy) newGoProxy(proxyUrl string) *goproxy.ProxyHttpServer {
+	proxy := goproxy.NewProxyHttpServer()
+	proxy.Logger = &Logger{logger: p.logger}
+	proxy.Verbose = true
+	proxy.NonproxyHandler = http.HandlerFunc(func (w http.ResponseWriter, req *http.Request) {
+		if req.Host == "" {
+			fmt.Fprintln(w, "Cannot handle requests without Host header, e.g., HTTP 1.0")
+			return
+		}
+		req.URL.Scheme = "http"
+		req.URL.Host = req.Host
+		proxy.ServeHTTP(w, req)
+	})
+
+	if proxyUrl != "" {
+		proxy.Tr.Proxy = func(req *http.Request) (*url.URL, error) {
+			return url.Parse(proxyUrl)
+		}
+		proxy.ConnectDial = proxy.NewConnectDialToProxy(proxyUrl)
+	}
+
+	return proxy
+}
+
+func FindProxyForURL(ctx *duktape.Context, url, host string, logger *device.Logger) (res string, err error) {
+	if !ctx.GetGlobalString("FindProxyForURL") {
+		ctx.Pop()
+		return "", fmt.Errorf("FindProxyForURL not found")
+	}
+
+	ctx.PushString(url)
+	ctx.PushString(host)
+
+	res = "DIRECT"
+	logger.Verbosef("Before pcall")
+	r := ctx.Pcall(2)
+	logger.Verbosef("After pcall")
+	if r == 0 {
+		res = ctx.GetString(-1)
+	} else if ctx.IsError(-1) {
+		ctx.GetPropString(-1, "stack")
+		err = fmt.Errorf("Error: %v", ctx.SafeToString(-1))
+	} else {
+		err = fmt.Errorf("Error: %v", ctx.SafeToString(-1))
+	}
+	ctx.Pop()
+	return
+}
+
+
+func FindProxyForPkg(ctx *duktape.Context, pkg string, logger *device.Logger) (res string, err error) {
+	if !ctx.GetGlobalString("FindProxyForPkg") {
+		ctx.Pop()
+		return "", fmt.Errorf("FindProxyForPkg not found")
+	}
+
+	ctx.PushString(pkg)
+
+	res = "DIRECT"
+	logger.Verbosef("Before pcall")
+	r := ctx.Pcall(1)
+	logger.Verbosef("After pcall")
+	if r == 0 {
+		res = ctx.GetString(-1)
+	} else if ctx.IsError(-1) {
+		ctx.GetPropString(-1, "stack")
+		err = fmt.Errorf("Error: %v", ctx.SafeToString(-1))
+	} else {
+		err = fmt.Errorf("Error: %v", ctx.SafeToString(-1))
+	}
+	ctx.Pop()
+	return
+}
+
+func newPacBodyCtx(body string, logger *device.Logger) *duktape.Context {
+	ctx := duktape.New()
+	ctx.PushGlobalGoFunction("dnsResolve",
+		func(ctx *duktape.Context) int {
+			// Check stack
+			host := ctx.GetString(-1)
+			ctx.Pop()
+			ips, err := net.LookupIP(host)
+			if err != nil {
+				return 0
+			}
+
+			for _, ip := range(ips) {
+				ipStr := string(ip)
+				if strings.Contains(ipStr, ".") {
+					// Found IPv4
+					ctx.PushString(ipStr)
+					return 1
+				}
+			}
+			// No IPv4
+			return 0
+		})
+
+	ctx.PevalString(ASCII_PAC_UTILS)
+	logger.Verbosef("ASCII_PAC_UTILS result is: %v stack:%v", ctx.GetType(-1), ctx.GetTop())
+	ctx.Pop()
+
+	ctx.PevalString(string(body))
+	logger.Verbosef("result is: %v stack:%v", ctx.GetType(-1), ctx.GetTop())
+	ctx.Pop()
+	FindProxyForURL(ctx, "http://www.jabra.se/", "www.jabra.se", logger)
+	return ctx
+}
+
+func (p *HttpProxy) newPacFileCtx(pacFileUrl *url.URL) (*duktape.Context, error) {
+	var pacFileBody = ""
+	if pacFileUrl == nil {
+		return nil, nil
+	}
+
+	resp, err := http.Get(pacFileUrl.String())
+	p.logger.Verbosef("pacFile: %v, %v", resp, err)
+
+	if err == nil {
+		defer resp.Body.Close()
+		ct, ok := resp.Header["Content-Type"]
+		if ok && len(ct) == 1 && ct[0] == "application/x-ns-proxy-autoconfig" {
+			body, err := io.ReadAll(resp.Body)
+			if err == nil {
+				pacFileBody = string(body)
+				return newPacBodyCtx(pacFileBody, p.logger), nil
+			}
+		}
+	}
+
+	return nil, err
+}
+
+func (p *HttpProxy) SetPacFileUrl(pacFileUrl *url.URL) error {
+	ctx, err := p.newPacFileCtx(pacFileUrl)
+	if err != nil {
+		return err
+	}
+
+	for _, handler := range(p.handlers) {
+		handler.setPacCtx(ctx)
+	}
+
+	if p.ctx != nil {
+		p.ctx.Destroy()
+	}
+	p.ctx = ctx
+	return nil
+}
+
+func (p *HttpProxy) Start() (listen_port uint16, err error) {
+	p.logger.Verbosef("HttpProxy.Start()")
+	listen_port = 0
+
+
+	proxyMap := make(map[string]*goproxy.ProxyHttpServer)
+
+	p.defaultProxy = p.newGoProxy("")
+	proxyMap[""] = p.defaultProxy
+
+	listen_port, handler, err := p.startRegularProxy(proxyMap)
+	if err != nil {
+		return
+	}
+	p.handlers = append(p.handlers, handler)
+
+	return
+}
+
+func (p *HttpProxy) startRegularProxy(proxyMap map[string]*goproxy.ProxyHttpServer) (listen_port uint16, handler *HttpHandler, err error) {
+	p.listener, err = net.Listen("tcp", "[::]:")
+	if err != nil {
+		return
+	}
+
+	p.addrPort, err = netip.ParseAddrPort(p.listener.Addr().String())
+	if err != nil {
+		return
+	}
+
+	listen_port = p.addrPort.Port()
+
+	handler = NewHttpHandler(p, p.defaultProxy, proxyMap, p.logger)
+
+	go http.Serve(NewListener(p.listener, handler, p.logger), handler)
+	return
+}
+
+func (p *HttpProxy) Stop() {
+	if p.listener != nil {
+		p.logger.Verbosef("Close: %v", p.listener)
+		p.listener.Close()
+//		p.listener = nil
+	}
+	if p.tlsListener != nil {
+		p.logger.Verbosef("Close: %v", p.tlsListener)
+		p.tlsListener.Close()
+//		p.tlsListener = nil
+	}
+	if p.ctx != nil {
+		p.ctx.DestroyHeap()
+		p.ctx = nil
+	}
+}
+
+type HttpHandler struct {
+	p *HttpProxy
+	defaultProxy *goproxy.ProxyHttpServer
+	logger *device.Logger
+	remoteAddrPkgMapMutex sync.RWMutex
+	remoteAddrPkgMap map[string]*goproxy.ProxyHttpServer
+	uidRequest chan UidRequest
+	ctx *duktape.Context
+	proxyMap map[string]*goproxy.ProxyHttpServer
+}
+
+func NewHttpHandler(p *HttpProxy, defaultProxy *goproxy.ProxyHttpServer, proxyMap map[string]*goproxy.ProxyHttpServer, logger *device.Logger) *HttpHandler{
+	h := &HttpHandler{
+		p: p,
+		defaultProxy: defaultProxy,
+		logger: logger,
+		remoteAddrPkgMapMutex: sync.RWMutex{},
+		remoteAddrPkgMap: make(map[string]*goproxy.ProxyHttpServer),
+		uidRequest: p.uidRequest,
+		proxyMap: proxyMap,
+	}
+
+	return h
+}
+
+// TODO fix multi-threading
+func (h *HttpHandler) setPacCtx(ctx *duktape.Context) {
+	h.ctx = ctx
+}
+
+func (h *HttpHandler) addConnToProxyMap(c net.Conn) error {
+	h.logger.Verbosef("Accept: %v -> %v", c.RemoteAddr().String(), c.LocalAddr().String())
+	local, err := netip.ParseAddrPort(c.RemoteAddr().String())
+	if err != nil {
+		return fmt.Errorf("Bad local address (%v): %v", c.RemoteAddr(), err)
+	}
+	// Remove IPv6 zone, NOOP on IPv4
+	local = netip.AddrPortFrom(local.Addr().WithZone(""), local.Port())
+
+	remote, err := netip.ParseAddrPort(c.LocalAddr().String())
+	if err != nil {
+		return fmt.Errorf("Bad remote address (%v): %v", c.LocalAddr(), err)
+	}
+
+	h.logger.Verbosef("uidRequest: %v -> %v", local, remote)
+	addrPortPair := AddrPortPair{local: local, remote: remote}
+	retCh := make(chan string)
+	h.uidRequest <- UidRequest{Data: addrPortPair, RetCh: retCh}
+
+	select {
+	case pkg := <-retCh:
+		h.logger.Verbosef("uidResponse: '%v'", pkg)
+
+		proxy, ok := h.proxyMap[pkg]
+		if !ok {
+			proxy = h.findProxyForPkg(pkg)
+		}
+
+		if proxy != nil {
+			h.remoteAddrPkgMapMutex.Lock()
+			h.remoteAddrPkgMap[c.RemoteAddr().String()] = proxy
+			h.remoteAddrPkgMapMutex.Unlock()
+		}
+	}
+
+	return nil
+}
+
+func (h *HttpHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
+	h.remoteAddrPkgMapMutex.Lock()
+	proxy, ok := h.remoteAddrPkgMap[req.RemoteAddr]
+	if ok && proxy != nil {
+		delete(h.remoteAddrPkgMap, req.RemoteAddr)
+		h.remoteAddrPkgMapMutex.Unlock()
+
+		proxyStr := "nil"
+		proxyUrl, err := proxy.Tr.Proxy(req)
+		if err == nil && proxyUrl != nil {
+			proxyStr = proxyUrl.String()
+		}
+		h.logger.Verbosef("ServeHTTP remote:%s proxy:%v", req.RemoteAddr, proxyStr)
+
+		proxy.ServeHTTP(rw, req)
+	} else {
+		h.remoteAddrPkgMapMutex.Unlock()
+		h.defaultProxy.ServeHTTP(rw, req)
+	}
+}
+
+func (h *HttpHandler) findProxyForPkg(pkg string) *goproxy.ProxyHttpServer {
+	if h.ctx == nil {
+		return nil
+	}
+
+	find := func() (cat string, res string, err error) {
+		h.logger.Verbosef("Call FindProxyForPkg %v %v", pkg)
+		res, err = FindProxyForPkg(h.ctx, pkg, h.logger)
+		h.logger.Verbosef("FindProxyForPkg res %v %v", res, err)
+		if err != nil {
+			h.logger.Verbosef("FindProxyForPkg result is: %v stack:%v", res, h.ctx.GetTop())
+				return "", "", err
+		} else {
+			values := strings.Split(strings.Trim(res, " "), ";")
+			for _, v := range values {
+				value := strings.Trim(v, " ")
+				parts := strings.SplitN(value, " ", 2)
+				if parts[0] == "PROXY" {
+					return parts[0], parts[1], nil
+				} else if parts[0] == "DIRECT" {
+					return parts[0], "", nil
+				}
+			}
+			}
+		return "", "", fmt.Errorf("No result")
+	}
+	cat, res, err := find()
+	if err != nil {
+		return nil
+	}
+
+	var proxy *goproxy.ProxyHttpServer
+	if cat == "PROXY" {
+		proxy = h.p.newGoProxy("http://" + res)
+	} else {
+		proxy = h.defaultProxy
+	}
+	h.proxyMap[pkg] = proxy
+
+	return proxy
+}
+
+type AddrPortPair struct {
+	local netip.AddrPort
+	remote netip.AddrPort
+}
+
+// Listener
+type Listener struct {
+	l net.Listener
+	handler *HttpHandler
+	logger *device.Logger
+}
+
+func NewListener(listener net.Listener, handler *HttpHandler, logger *device.Logger) *Listener{
+	l := &Listener{
+		l: listener,
+		handler: handler,
+		logger: logger,
+	}
+
+	return l
+}
+
+func (l *Listener) Accept() (net.Conn, error) {
+	c, err := l.l.Accept()
+	if err != nil {
+		l.logger.Verbosef("Accept failed: %v", err)
+		return c, err
+	}
+
+	if err := l.handler.addConnToProxyMap(c); err != nil {
+		err = fmt.Errorf("Reject connection (%v): %v", c, err)
+		c.Close()
+		return nil, err
+	}
+
+	return c, nil
+}
+
+func (l *Listener) Close() error {
+	return l.l.Close()
+}
+
+func (l *Listener) Addr() net.Addr {
+	return l.l.Addr()
+}
diff --git a/tunnel/tools/libwg-go/service.go b/tunnel/tools/libwg-go/service.go
index 2a0dfb2d..37fb4b40 100644
--- a/tunnel/tools/libwg-go/service.go
+++ b/tunnel/tools/libwg-go/service.go
@@ -3,25 +3,45 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
+	"net/url"
 	"os"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	gen "golang.zx2c4.com/wireguard/android/gen"
 	"golang.zx2c4.com/wireguard/device"
 )
 
+const (
+	IPPROTO_TCP = 6
+)
+
+type UidRequest struct {
+	Data AddrPortPair
+	RetCh chan string
+}
+
 type LibwgServiceImpl struct {
 	gen.UnimplementedLibwgServer
 	logger *device.Logger
+	httpProxy *HttpProxy
+	uidRequest chan UidRequest
+	stopReverse chan bool
 }
 
-var _ gen.LibwgServer = (*LibwgServiceImpl)(nil)
+var service *LibwgServiceImpl
 var server *grpc.Server
 
 func NewLibwgService(logger *device.Logger) gen.LibwgServer {
-	return &LibwgServiceImpl{logger: logger}
+	return &LibwgServiceImpl{
+		logger: logger,
+		uidRequest: make(chan UidRequest),
+		stopReverse: make(chan bool),
+	}
 }
 
 func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
@@ -41,7 +61,7 @@ func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
 	}
 
 	server = grpc.NewServer()
-	service := NewLibwgService(logger)
+	service = NewLibwgService(logger).(*LibwgServiceImpl)
 
 	gen.RegisterLibwgServer(server, service)
 
@@ -67,6 +87,7 @@ func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcReques
 	if server != nil {
 		server.Stop()
 		server = nil
+		service = nil
 	}
 
 	r := &gen.StopGrpcResponse{
@@ -74,3 +95,125 @@ func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcReques
 
 	return r, nil
 }
+
+func buildStartHttpProxyError(message string) (*gen.StartHttpProxyResponse, error) {
+	r := &gen.StartHttpProxyResponse{
+		Error: &gen.Error{
+			Message: message,
+		},
+	}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) StartHttpProxy(ctx context.Context, req *gen.StartHttpProxyRequest) (*gen.StartHttpProxyResponse, error) {
+	var listenPort uint16
+	if e.httpProxy == nil {
+		e.httpProxy = NewHttpProxy(e.uidRequest, e.logger)
+		var err error
+		listenPort, err = e.httpProxy.Start()
+
+		if err != nil {
+			e.httpProxy = nil
+			return buildStartHttpProxyError(fmt.Sprintf("Http proxy start failed: %v", err))
+		}
+	} else {
+		listenPort = e.httpProxy.GetAddrPort().Port()
+	}
+
+	pacFileUrl, err := url.Parse(req.PacFileUrl)
+	if err != nil {
+		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, req.PacFileUrl))
+	}
+
+	err = e.httpProxy.SetPacFileUrl(pacFileUrl)
+	if err != nil {
+		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", req.PacFileUrl))
+	}
+
+	r := &gen.StartHttpProxyResponse{
+		ListenPort: uint32(listenPort),
+	}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) StopHttpProxy(ctx context.Context, req *gen.StopHttpProxyRequest) (*gen.StopHttpProxyResponse, error) {
+	if e.httpProxy == nil {
+		r := &gen.StopHttpProxyResponse{
+			Error: &gen.Error{
+				Message: fmt.Sprintf("Http proxy not running"),
+			},
+		}
+		return r, nil
+	}
+
+	e.httpProxy.Stop()
+	e.httpProxy = nil
+	e.stopReverse <- true
+	r := &gen.StopHttpProxyResponse{}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) Reverse(stream gen.Libwg_ReverseServer) error {
+	e.logger.Verbosef("Reverse enter loop")
+	for e.httpProxy != nil {
+		var err error
+
+		//		err := contextError(stream.Context())
+		err = stream.Context().Err()
+		if err != nil {
+			e.logger.Verbosef("Reverse: context: %v", err)
+			return err
+		}
+
+		select {
+		case <-e.stopReverse:
+			e.logger.Verbosef("Reverse: stop")
+			break
+		case uidReq := <-e.uidRequest:
+			addrPortPair := uidReq.Data
+			local := addrPortPair.local
+			remote := addrPortPair.remote
+			r := &gen.ReverseResponse{
+				Request: &gen.ReverseResponse_Uid{
+					Uid: &gen.GetConnectionOwnerUidRequest{
+						Protocol: IPPROTO_TCP,
+						Local: &gen.InetSocketAddress{
+							Address: &gen.InetAddress{
+								Address: local.Addr().AsSlice(),
+							},
+							Port: uint32(local.Port()),
+						},
+						Remote: &gen.InetSocketAddress{
+							Address: &gen.InetAddress{
+								Address: remote.Addr().AsSlice(),
+							},
+							Port: uint32(remote.Port()),
+						},
+					},
+				},
+			}
+
+			stream.Send(r)
+
+			req, err := stream.Recv()
+			if err == io.EOF {
+				e.logger.Verbosef("no more data")
+				uidReq.RetCh <- ""
+				break
+			}
+			if err != nil {
+				err = status.Errorf(codes.Unknown, "cannot receive stream request: %v", err)
+				e.logger.Verbosef("Reverse: %v", err)
+				uidReq.RetCh <- ""
+				return err
+			}
+
+			e.logger.Verbosef("Reverse: received, wait: %v", req)
+			uidReq.RetCh <- req.GetUid().GetPackage()
+		}
+	}
+
+
+	e.logger.Verbosef("Reverse returns")
+	return nil
+}