HttpClient 实现 socks 代理

HttpClient 实现 socks 代理

使用的环境

            org.apache.httpcomponents
            httpclient
            4.4.1
        
        
            org.apache.httpcomponents
            httpcore
            4.4.1
        

代码及 ConnectionSocketFactory 实现类

package xxx;

import com.lucas.admin.util.HttpClientUtil;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;

/**
 * @author kzcming
 * @since 2020/11/19 15:51
 */

public class Test {

    public static void main(String[] args) throws Exception {
        test("https://www.cnblogs.com/");
    }


    public static void test(String url) throws Exception{
        // ConnectionSocketFactory注册
        Registry reg = RegistryBuilder.create()
                .register("http", new MyConnectionSocketFactory())
                .register("https",new MySSLConnectionSocketFactory()).build();
        // HTTP客户端连接管理池
        PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(reg);
        CloseableHttpClient httpclient = HttpClients.custom()
                .setConnectionManager(connManager)
                .build();
        try {
            // socks代理地址 , socks 地址和端口,这里随便写了一个1008
            InetSocketAddress socksaddr = new InetSocketAddress("你的地址", 1008);
            HttpClientContext context = HttpClientContext.create();
            context.setAttribute("socks.address", socksaddr);

            // 请求目标
            HttpGet request = new HttpGet(url);
            System.out.println("----------------------------------------");
            System.out.println("执行请求 ：" + request.getRequestLine());
            System.out.println("通过代理： " + socksaddr);
            System.out.println("----------------------------------------");

            CloseableHttpResponse response = httpclient.execute(request, context);
            try {
                HttpEntity entity = response.getEntity();
                System.out.println("----------------------------------------");
                System.out.println("返回响应：" + response.getStatusLine());
                System.out.println("响应内容：" + EntityUtils.toString(entity));
                System.out.println("----------------------------------------");
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }


    /**
     * 实现 http 链接的socket 工厂
     */
    static class MyConnectionSocketFactory extends PlainConnectionSocketFactory {
        @Override
        public Socket createSocket(final HttpContext context) throws IOException {
            InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
            // socket代理
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
            return new Socket(proxy);
        }
    }


    /**
     * 实现 https 链接的socket 工厂
     */
    static class MySSLConnectionSocketFactory extends SSLConnectionSocketFactory {
        public MySSLConnectionSocketFactory() {
            super(SSLContexts.createDefault(), getDefaultHostnameVerifier());
        }


        @Override
        public Socket createSocket(final HttpContext context) throws IOException {
            InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
//            // socket代理
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
            return new Socket(proxy);
        }
    }


}

说明

• 为什么非得实现一个ConnectionSocketFactory 类,因为这个类,可以看出来这个类就是底层socket请求的时候,创建socket,请求套接字,指定请求ip和端口的,
  而 socks 协议是通过 socket 实现的协议,如果不实现一个 ConnectionSocketFactory 实现类,最后在请求的时候,会直接访问原来网址绑定的ip和端口,
  实现了这个接口,在请求的时候就相当于在 待请求的目标地址外,包了一层外壳,会先去请求 socks 代理地址 和 端口
  , 具体详情请看 org.apache.http.impl.conn.DefaultHttpClientConnectionOperator 类的 connect 方法,部分代码如下

public void connect(
            final ManagedHttpClientConnection conn,
            final HttpHost host,
            final InetSocketAddress localAddress,
            final int connectTimeout,
            final SocketConfig socketConfig,
            final HttpContext context) throws IOException {
        final Lookup registry = getSocketFactoryRegistry(context);
        final ConnectionSocketFactory sf = registry.lookup(host.getSchemeName());
        if (sf == null) {
            throw new UnsupportedSchemeException(host.getSchemeName() +
                    " protocol is not supported");
        }
        final InetAddress[] addresses = host.getAddress() != null ?
                new InetAddress[] { host.getAddress() } : this.dnsResolver.resolve(host.getHostName());
        final int port = this.schemePortResolver.resolve(host);
        for (int i = 0; i < addresses.length; i++) {
            final InetAddress address = addresses[i];
            final boolean last = i == addresses.length - 1;

            Socket sock = sf.createSocket(context);
            sock.setSoTimeout(socketConfig.getSoTimeout());
            sock.setReuseAddress(socketConfig.isSoReuseAddress());
            sock.setTcpNoDelay(socketConfig.isTcpNoDelay());
            sock.setKeepAlive(socketConfig.isSoKeepAlive());
            if (socketConfig.getRcvBufSize() > 0) {
                sock.setReceiveBufferSize(socketConfig.getRcvBufSize());
            }
            if (socketConfig.getSndBufSize() > 0) {
                sock.setSendBufferSize(socketConfig.getSndBufSize());
            }

            final int linger = socketConfig.getSoLinger();
            if (linger >= 0) {
                sock.setSoLinger(true, linger);
            }
            conn.bind(sock);

            final InetSocketAddress remoteAddress = new InetSocketAddress(address, port);
            if (this.log.isDebugEnabled()) {
                this.log.debug("Connecting to " + remoteAddress);
            }
            try {
                sock = sf.connectSocket(
                        connectTimeout, sock, host, remoteAddress, localAddress, context);
                conn.bind(sock);
                if (this.log.isDebugEnabled()) {
                    this.log.debug("Connection established " + conn);
                }
                return;
........

• 如果是http 或者 https 协议,则需要在创建 HttpClientBuilder 的时候在 setProxy 方法中指定一个代理,最后会在 build() 创建 HttpClient的时候,根据有无代理,创建HttpRoutePlanner
  ,创建部分代码如下

........
HttpRoutePlanner routePlannerCopy = this.routePlanner;
        if (routePlannerCopy == null) {
            SchemePortResolver schemePortResolverCopy = this.schemePortResolver;
            if (schemePortResolverCopy == null) {
                schemePortResolverCopy = DefaultSchemePortResolver.INSTANCE;
            }
            if (proxy != null) {
                routePlannerCopy = new DefaultProxyRoutePlanner(proxy, schemePortResolverCopy);
            } else if (systemProperties) {
                routePlannerCopy = new SystemDefaultRoutePlanner(
                        schemePortResolverCopy, ProxySelector.getDefault());
            } else {
                routePlannerCopy = new DefaultRoutePlanner(schemePortResolverCopy);
            }
        }
........

最后会在 HttpClient 的实现类的doExecute 方法中,根据HttpRoutePlanner 的实现类的 determineRoute 去创建HttpRoute ,最后在由 ClientExecChain 的实现类,去执行 CloseableHttpResponse execute(
HttpRoute route,
HttpRequestWrapper request,
HttpClientContext clientContext,
HttpExecutionAware execAware) throws IOException, HttpException; 得到响应
以下是 DefaultRoutePlanner 的 determineRoute 方法代码

@Override
    public HttpRoute determineRoute(
            final HttpHost host,
            final HttpRequest request,
            final HttpContext context) throws HttpException {
        Args.notNull(request, "Request");
        if (host == null) {
            throw new ProtocolException("Target host is not specified");
        }
        final HttpClientContext clientContext = HttpClientContext.adapt(context);
        final RequestConfig config = clientContext.getRequestConfig();
        final InetAddress local = config.getLocalAddress();
        HttpHost proxy = config.getProxy();
        if (proxy == null) {
            proxy = determineProxy(host, request, context);
        }

        final HttpHost target;
        if (host.getPort() <= 0) {
            try {
                target = new HttpHost(
                        host.getHostName(),
                        this.schemePortResolver.resolve(host),
                        host.getSchemeName());
            } catch (final UnsupportedSchemeException ex) {
                throw new HttpException(ex.getMessage());
            }
        } else {
            target = host;
        }
        final boolean secure = target.getSchemeName().equalsIgnoreCase("https");
        if (proxy == null) {
            return new HttpRoute(target, local, secure);
        } else {
            return new HttpRoute(target, local, proxy, secure);
        }
    }