1 /*
   2  * Copyright (c) 2000, 2010, 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 com.sun.security.auth.module;
  27 
  28 /**
  29  * <p> This class implementation retrieves and makes available Unix
  30  * UID/GID/groups information for the current user.
  31  *
  32  */
  33 @jdk.Supported
  34 public class UnixSystem {
  35 
  36     private native void getUnixInfo();
  37 
  38     protected String username;
  39     protected long uid;
  40     protected long gid;
  41     protected long[] groups;
  42 
  43     /**
  44      * Instantiate a <code>UnixSystem</code> and load
  45      * the native library to access the underlying system information.
  46      */
  47     public UnixSystem() {
  48         System.loadLibrary("jaas_unix");
  49         getUnixInfo();
  50     }
  51 
  52     /**
  53      * Get the username for the current Unix user.
  54      *
  55      * <p>
  56      *
  57      * @return the username for the current Unix user.
  58      */
  59     public String getUsername() {
  60         return username;
  61     }
  62 
  63     /**
  64      * Get the UID for the current Unix user.
  65      *
  66      * <p>
  67      *
  68      * @return the UID for the current Unix user.
  69      */
  70     public long getUid() {
  71         return uid;
  72     }
  73 
  74     /**
  75      * Get the GID for the current Unix user.
  76      *
  77      * <p>
  78      *
  79      * @return the GID for the current Unix user.
  80      */
  81     public long getGid() {
  82         return gid;
  83     }
  84 
  85     /**
  86      * Get the supplementary groups for the current Unix user.
  87      *
  88      * <p>
  89      *
  90      * @return the supplementary groups for the current Unix user.
  91      */
  92     public long[] getGroups() {
  93         return groups == null ? null : groups.clone();
  94     }
  95 }