     1 /*
     2  * Copyright (c) 2000, 2019, 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  * This class implementation retrieves and makes available Unix
    30  * UID/GID/groups information for the current user.
    31  */
    32 public class UnixSystem {
    33
    34     private native void getUnixInfo();
    35
    36     // Warning: the following 4 fields are used by Unix.c

    37     protected String username;

    38     protected long uid;

    39     protected long gid;

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