content: /*
   * Copyright (c) 2019 abc123lzf <abc123lzf@126.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  package com.lzf.flyingsocks.client.proxy.transparent;
  
  import io.netty.channel.epoll.EpollSocketChannel;
  import io.netty.util.internal.NativeLibraryLoader;
  import io.netty.util.internal.PlatformDependent;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.net.InetSocketAddress;
  import java.util.Objects;
  
  /**
   * 透明代理本地接口
   *
   * @author lzf abc123lzf@126.com
   * @since 2021/1/24 21:08
   */
  final class LinuxNative {
  
      private static final Logger log = LoggerFactory.getLogger(LinuxNative.class);
  
      static {
          String libName = "libflyingsocks_transparent_" + PlatformDependent.normalizedArch();
          log.info("Load transparent native lib: {}", libName);
  
          ClassLoader loader = PlatformDependent.getClassLoader(LinuxNative.class);
          try {
              NativeLibraryLoader.load(libName, loader);
          } catch (UnsatisfiedLinkError e) {
              log.error("Load transparent native lib failure", e);
              throw e;
          }
      }
  
      /**
       * @return 目标地址
       */
      public static InetSocketAddress getTargetAddress(EpollSocketChannel channel) {
          Objects.requireNonNull(channel);
          return getTargetAddress0(channel.fd().intValue());
      }
  
  
      private native static InetSocketAddress getTargetAddress0(int fd);
  
  
      private LinuxNative() { }
  }
  