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