content: /*
   * Copyright (c) 2014, 2022, Oracle and/or its affiliates.
   *
   * This program is free software; you can redistribute it and/or modify it under
   * the terms of the GNU General Public License, version 2.0, as published by the
   * Free Software Foundation.
   *
   * This program is also distributed with certain software (including but not
   * limited to OpenSSL) that is licensed under separate terms, as designated in a
   * particular file or component or in included license documentation. The
   * authors of MySQL hereby grant you an additional permission to link the
   * program and your derivative works with the separately licensed software that
   * they have included with MySQL.
   *
   * Without limiting anything contained in the foregoing, this file, which is
   * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
   * version 1.0, a copy of which can be found at
   * http://oss.oracle.com/licenses/universal-foss-exception.
   *
   * This program 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, version 2.0,
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
   */
  
  package com.mysql.cj.protocol;
  
  import java.io.Closeable;
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  import java.net.Proxy;
  import java.net.Socket;
  import java.net.SocketException;
  
  import com.mysql.cj.conf.PropertyKey;
  import com.mysql.cj.conf.PropertySet;
  
  /**
   * A socket factory used to create sockets connecting through a SOCKS proxy. The socket still supports all the same TCP features as the "standard" socket.
   */
  public class SocksProxySocketFactory extends StandardSocketFactory {
  
      @Override
      protected Socket createSocket(PropertySet props) {
          String socksProxyHost = props.getStringProperty(PropertyKey.socksProxyHost).getValue();
          int socksProxyPort = props.getIntegerProperty(PropertyKey.socksProxyPort).getValue();
          return new Socket(new Proxy(Proxy.Type.SOCKS, new InetSocketAddress(socksProxyHost, socksProxyPort)));
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public <T extends Closeable> T connect(String hostname, int portNumber, PropertySet pset, int loginTimeout) throws IOException {
          if (!pset.getBooleanProperty(PropertyKey.socksProxyRemoteDns).getValue()) {
              // fall back to the parent connection procedure
              return super.connect(hostname, portNumber, pset, loginTimeout);
          }
  
          // proceed without local DNS resolution
          this.loginTimeoutCountdown = loginTimeout;
  
          if (pset != null && hostname != null) {
              this.host = hostname;
              this.port = portNumber;
  
              String localSocketHostname = pset.getStringProperty(PropertyKey.localSocketAddress).getValue();
              InetSocketAddress localSockAddr = localSocketHostname != null && localSocketHostname.length() > 0
                      ? new InetSocketAddress(InetAddress.getByName(localSocketHostname), 0)
                      : null;
              int connectTimeout = pset.getIntegerProperty(PropertyKey.connectTimeout).getValue();
  
              // save last exception to propagate to caller if connection fails
              try {
                  this.rawSocket = createSocket(pset);
                  configureSocket(this.rawSocket, pset);
  
                  // bind to the local port if not using the ephemeral port
                  if (localSockAddr != null) {
                      this.rawSocket.bind(localSockAddr);
                  }
  
                  this.rawSocket.connect(InetSocketAddress.createUnresolved(this.host, this.port), getRealTimeout(connectTimeout));
  
              } catch (SocketException ex) {
                  this.rawSocket = null;
                  throw ex;
              }
  
              resetLoginTimeCountdown();
  
              this.sslSocket = this.rawSocket;
              return (T) this.rawSocket;
          }
  
          throw new SocketException("Unable to create socket");
      }
  
  }
  