mirror of
https://github.com/wanghongenpin/proxypin.git
synced 2026-03-16 04:33:19 +08:00
327 lines
11 KiB
Dart
327 lines
11 KiB
Dart
/*
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* Copyright 2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import 'dart:async';
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import 'dart:typed_data';
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import 'package:network_proxy/network/components/host_filter.dart';
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import 'package:network_proxy/network/components/request_rewrite_manager.dart';
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import 'package:network_proxy/network/components/script_manager.dart';
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import 'package:network_proxy/network/host_port.dart';
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import 'package:network_proxy/network/http/http.dart';
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import 'package:network_proxy/network/http/websocket.dart';
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import 'package:network_proxy/network/proxy_helper.dart';
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import 'package:network_proxy/network/util/attribute_keys.dart';
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import 'package:network_proxy/network/util/logger.dart';
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import 'package:network_proxy/network/util/uri.dart';
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import 'package:network_proxy/utils/ip.dart';
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import 'channel.dart';
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import 'components/request_block_manager.dart';
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import 'http_client.dart';
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///请求和响应事件监听
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abstract class EventListener {
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void onRequest(Channel channel, HttpRequest request);
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void onResponse(ChannelContext channelContext, HttpResponse response);
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void onMessage(Channel channel, HttpMessage message, WebSocketFrame frame) {}
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}
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/// http请求处理器
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class HttpProxyChannelHandler extends ChannelHandler<HttpRequest> {
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EventListener? listener;
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RequestRewrites? requestRewrites;
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HttpProxyChannelHandler({this.listener, this.requestRewrites});
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@override
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void channelRead(ChannelContext channelContext, Channel channel, HttpRequest msg) async {
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//下载证书
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if (msg.uri == 'http://proxy.pin/ssl' || msg.requestUrl == 'http://127.0.0.1:${channel.socket.port}/ssl') {
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ProxyHelper.crtDownload(channel, msg);
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return;
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}
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//请求本服务
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if ((await localIps()).contains(msg.hostAndPort?.host) && msg.hostAndPort?.port == channel.socket.port) {
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ProxyHelper.localRequest(msg, channel);
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return;
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}
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//代理转发请求
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try {
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forward(channelContext, channel, msg).catchError((error, trace) {
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exceptionCaught(channelContext, channel, error, trace: trace);
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});
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} catch (error, trace) {
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exceptionCaught(channelContext, channel, error, trace: trace);
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}
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}
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@override
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void exceptionCaught(ChannelContext channelContext, Channel channel, error, {StackTrace? trace}) {
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super.exceptionCaught(channelContext, channel, error, trace: trace);
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ProxyHelper.exceptionHandler(channelContext, channel, listener, channelContext.currentRequest, error);
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}
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@override
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void channelInactive(ChannelContext channelContext, Channel channel) {
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Channel? remoteChannel = channelContext.serverChannel;
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remoteChannel?.close();
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// log.d("[${channel.id}] close ${channel.error}");
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}
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/// 转发请求
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Future<void> forward(ChannelContext channelContext, Channel channel, HttpRequest httpRequest) async {
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log.d("[${channel.id}] ${httpRequest.method.name} ${httpRequest.requestUrl}");
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if (channel.error != null) {
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ProxyHelper.exceptionHandler(channelContext, channel, listener, httpRequest, channel.error);
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return;
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}
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//获取远程连接
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Channel remoteChannel;
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try {
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remoteChannel = await _getRemoteChannel(channelContext, channel, httpRequest);
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} catch (error) {
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log.e("[${channel.id}] 连接异常 ${httpRequest.method.name} ${httpRequest.requestUrl}", error: error);
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if (httpRequest.method == HttpMethod.connect) {
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channel.error = error; //记录异常
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//https代理新建connect连接请求 返回ok 会继续发起正常请求 可以获取到请求内容
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await channel.write(
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HttpResponse(HttpStatus.ok.reason('Connection established'), protocolVersion: httpRequest.protocolVersion));
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} else {
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rethrow;
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}
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return;
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}
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//实现抓包代理转发
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if (httpRequest.method != HttpMethod.connect) {
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log.i("[${channel.id}] ${httpRequest.method.name} ${httpRequest.requestUrl}");
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if (HostFilter.filter(httpRequest.hostAndPort?.host)) {
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await remoteChannel.write(httpRequest);
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return;
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}
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var uri = '${httpRequest.remoteDomain()}${httpRequest.path()}';
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//脚本替换
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var scriptManager = await ScriptManager.instance;
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HttpRequest? request = await scriptManager.runScript(httpRequest);
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if (request == null) {
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listener?.onRequest(channel, httpRequest);
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return;
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}
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httpRequest = request;
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//重写请求
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await requestRewrites?.requestRewrite(httpRequest);
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listener?.onRequest(channel, httpRequest);
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//屏蔽请求
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var blockRequest = (await RequestBlockManager.instance).enableBlockRequest(uri);
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if (blockRequest) {
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log.d("[${channel.id}] 屏蔽请求 $uri");
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channel.close();
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remoteChannel.close();
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return;
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}
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//重定向
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String? redirectUrl = await requestRewrites?.getRedirectRule(uri);
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if (redirectUrl?.isNotEmpty == true) {
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await redirect(channelContext, channel, httpRequest, redirectUrl!);
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return;
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}
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await remoteChannel.write(httpRequest);
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}
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}
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//重定向
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Future<void> redirect(
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ChannelContext channelContext, Channel channel, HttpRequest httpRequest, String redirectUrl) async {
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var proxyHandler = HttpResponseProxyHandler(channel, listener: listener, requestRewrites: requestRewrites);
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var redirectUri = UriBuild.build(redirectUrl, params: httpRequest.queries);
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httpRequest.uri = redirectUri.path + (redirectUri.hasQuery ? '?${redirectUri.query}' : '');
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httpRequest.headers.host = redirectUri.hasPort ? "${redirectUri.host}:${redirectUri.port}" : redirectUri.host;
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var redirectChannel = await HttpClients.connect(Uri.parse(redirectUrl), proxyHandler, channelContext);
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channelContext.serverChannel = redirectChannel;
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await redirectChannel.write(httpRequest);
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}
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/// 获取远程连接
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Future<Channel> _getRemoteChannel(
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ChannelContext channelContext, Channel clientChannel, HttpRequest httpRequest) async {
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//客户端连接 作为缓存
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Channel? remoteChannel = channelContext.serverChannel;
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if (remoteChannel != null) {
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return remoteChannel;
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}
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var hostAndPort = httpRequest.hostAndPort ?? getHostAndPort(httpRequest);
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channelContext.host = hostAndPort;
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//远程转发
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HostAndPort? remote = channelContext.getAttribute(AttributeKeys.remote);
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//外部代理
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ProxyInfo? proxyInfo = channelContext.getAttribute(AttributeKeys.proxyInfo);
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if (remote != null || proxyInfo != null) {
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HostAndPort connectHost = remote ?? HostAndPort.host(proxyInfo!.host, proxyInfo.port!);
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final proxyChannel = await connectRemote(channelContext, clientChannel, connectHost);
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//代理建立完连接判断是否是https 需要发起connect请求
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if (httpRequest.method == HttpMethod.connect) {
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await proxyChannel.write(httpRequest);
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} else {
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await HttpClients.connectRequest(hostAndPort, proxyChannel);
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if (clientChannel.isSsl) {
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await proxyChannel.secureSocket(channelContext, host: hostAndPort.host);
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}
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}
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return proxyChannel;
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}
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final proxyChannel = await connectRemote(channelContext, clientChannel, hostAndPort);
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if (clientChannel.isSsl) {
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await proxyChannel.secureSocket(channelContext, host: hostAndPort.host);
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}
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//https代理新建连接请求
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if (httpRequest.method == HttpMethod.connect) {
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await clientChannel.write(
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HttpResponse(HttpStatus.ok.reason('Connection established'), protocolVersion: httpRequest.protocolVersion));
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}
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return proxyChannel;
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}
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/// 连接远程
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Future<Channel> connectRemote(ChannelContext channelContext, Channel clientChannel, HostAndPort connectHost) async {
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var proxyHandler = HttpResponseProxyHandler(clientChannel, listener: listener, requestRewrites: requestRewrites);
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var proxyChannel = await channelContext.connectServerChannel(connectHost, proxyHandler);
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return proxyChannel;
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}
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}
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/// http响应代理
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class HttpResponseProxyHandler extends ChannelHandler<HttpResponse> {
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//客户端的连接
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final Channel clientChannel;
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EventListener? listener;
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RequestRewrites? requestRewrites;
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HttpResponseProxyHandler(this.clientChannel, {this.listener, this.requestRewrites});
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@override
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void channelRead(ChannelContext channelContext, Channel channel, HttpResponse msg) async {
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var request = channelContext.currentRequest;
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request?.response = msg;
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//域名是否过滤
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if (HostFilter.filter(request?.hostAndPort?.host) || request?.method == HttpMethod.connect) {
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await clientChannel.write(msg);
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return;
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}
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// log.i("[${clientChannel.id}] Response $msg");
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//脚本替换
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var scriptManager = await ScriptManager.instance;
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try {
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HttpResponse? response = await scriptManager.runResponseScript(msg);
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if (response == null) {
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channel.close();
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return;
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}
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msg = response;
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} catch (e, t) {
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msg.status = HttpStatus(-1, 'Script exec error');
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msg.body = "$e\n${msg.bodyAsString}".codeUnits;
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log.e('[${clientChannel.id}] 执行脚本异常 ', error: e, stackTrace: t);
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}
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//重写响应
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try {
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await requestRewrites?.responseRewrite(msg.request?.requestUrl, msg);
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} catch (e, t) {
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msg.body = "$e".codeUnits;
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log.e('[${clientChannel.id}] 响应重写异常 ', error: e, stackTrace: t);
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}
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listener?.onResponse(channelContext, msg);
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//屏蔽响应
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var uri = '${request?.remoteDomain()}${request?.path()}';
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var blockResponse = (await RequestBlockManager.instance).enableBlockResponse(uri);
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if (blockResponse) {
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channel.close();
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return;
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}
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//发送给客户端
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await clientChannel.write(msg);
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}
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@override
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void channelInactive(ChannelContext channelContext, Channel channel) {
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clientChannel.close();
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}
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}
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class RelayHandler extends ChannelHandler<Object> {
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final Channel remoteChannel;
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RelayHandler(this.remoteChannel);
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@override
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void channelRead(ChannelContext channelContext, Channel channel, Object msg) async {
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//发送给客户端
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remoteChannel.write(msg);
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}
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@override
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void channelInactive(ChannelContext channelContext, Channel channel) {
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remoteChannel.close();
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}
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}
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/// websocket处理器
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class WebSocketChannelHandler extends ChannelHandler<Uint8List> {
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final WebSocketDecoder decoder = WebSocketDecoder();
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final Channel proxyChannel;
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final HttpMessage message;
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WebSocketChannelHandler(this.proxyChannel, this.message);
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@override
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void channelRead(ChannelContext channelContext, Channel channel, Uint8List msg) {
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proxyChannel.write(msg);
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var frame = decoder.decode(msg);
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if (frame == null) {
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return;
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}
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frame.isFromClient = message is HttpRequest;
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message.messages.add(frame);
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channelContext.listener?.onMessage(channel, message, frame);
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logger.d("socket channelRead ${frame.payloadLength} ${frame.fin} ${frame.payloadDataAsString}");
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}
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}
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