1/*
2 * Copyright (c) 2000, 2013, 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
26package 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 */
32public class UnixSystem {
33
34    private native void getUnixInfo();
35
36    protected String username;
37    protected long uid;
38    protected long gid;
39    protected long[] groups;
40
41    /**
42     * Instantiate a {@code UnixSystem} and load
43     * the native library to access the underlying system information.
44     */
45    public UnixSystem() {
46        System.loadLibrary("jaas_unix");
47        getUnixInfo();
48    }
49
50    /**
51     * Get the username for the current Unix user.
52     *
53     * @return the username for the current Unix user.
54     */
55    public String getUsername() {
56        return username;
57    }
58
59    /**
60     * Get the UID for the current Unix user.
61     *
62     * @return the UID for the current Unix user.
63     */
64    public long getUid() {
65        return uid;
66    }
67
68    /**
69     * Get the GID for the current Unix user.
70     *
71     * @return the GID for the current Unix user.
72     */
73    public long getGid() {
74        return gid;
75    }
76
77    /**
78     * Get the supplementary groups for the current Unix user.
79     *
80     * @return the supplementary groups for the current Unix user.
81     */
82    public long[] getGroups() {
83        return groups == null ? null : groups.clone();
84    }
85}
86