1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.net.util;
  27 
  28 import java.io.IOException;
  29 import java.lang.reflect.Constructor;
  30 import java.net.InetSocketAddress;
  31 import java.security.AccessController;
  32 import java.security.PrivilegedAction;
  33 
  34 import sun.security.util.SecurityProperties;
  35 
  36 public final class SocketExceptions {
  37     private SocketExceptions() {}
  38 
  39     private static final boolean enhancedExceptionText =
  40         SecurityProperties.includedInExceptions("hostInfo");
  41 
  42     /**
  43      * Utility which takes an exception and returns either the same exception
  44      * or a new exception of the same type with the same stack trace
  45      * and detail message enhanced with addressing information from the
  46      * given InetSocketAddress.
  47      *
  48      * If the system/security property "jdk.includeInExceptions" is not
  49      * set or does not contain the category hostInfo,
  50      * then the original exception is returned.
  51      *
  52      * Only specific IOException subtypes are supported.
  53      */
  54     public static IOException of(IOException e, InetSocketAddress address) {
  55         if (!enhancedExceptionText || address == null)
  56             return e;
  57         int port = address.getPort();
  58         String host = address.getHostString();
  59         StringBuilder sb = new StringBuilder();
  60         sb.append(e.getMessage());
  61         sb.append(": ");
  62         sb.append(host);
  63         sb.append(':');
  64         sb.append(Integer.toString(port));
  65         String enhancedMsg = sb.toString();
  66         return create(e, enhancedMsg);
  67     }
  68 
  69     // return a new instance of the same type with the given detail
  70     // msg, or if the type doesn't support detail msgs, return given
  71     // instance.
  72 
  73     private static IOException create(IOException e, String msg) {
  74         return AccessController.doPrivileged(new PrivilegedAction<IOException>() {
  75             public IOException run() {
  76                 try {
  77                     Class<?> clazz = e.getClass();
  78                     Constructor<?> ctor = clazz.getConstructor(String.class);
  79                     IOException e1 = (IOException)(ctor.newInstance(msg));
  80                     e1.setStackTrace(e.getStackTrace());
  81                     return e1;
  82                 } catch (Exception e0) {
  83                     // Some eg AsynchronousCloseException have no detail msg
  84                     return e;
  85                 }
  86             }
  87         });
  88     }
  89 }