1 /*
2  * Copyright (c) 2008, 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 
26 package sun.nio.fs;
27 
28 import java.nio.file.attribute.*;
29 import java.io.IOException;
30 import static sun.nio.fs.UnixNativeDispatcher.*;
31 
32 /**
33  * Unix implementation of java.nio.file.attribute.UserPrincipal
34  */
35 
36 class UnixUserPrincipals {
createSpecial(String name)37     private static User createSpecial(String name) { return new User(-1, name); }
38 
39     static final User SPECIAL_OWNER = createSpecial("OWNER@");
40     static final User SPECIAL_GROUP = createSpecial("GROUP@");
41     static final User SPECIAL_EVERYONE = createSpecial("EVERYONE@");
42 
43     static class User implements UserPrincipal {
44         private final int id;             // uid or gid
45         private final boolean isGroup;
46         private final String name;
47 
User(int id, boolean isGroup, String name)48         private User(int id, boolean isGroup, String name) {
49             this.id = id;
50             this.isGroup = isGroup;
51             this.name = name;
52         }
53 
User(int id, String name)54         User(int id, String name) {
55             this(id, false, name);
56         }
57 
uid()58         int uid() {
59             if (isGroup)
60                 throw new AssertionError();
61             return id;
62         }
63 
gid()64         int gid() {
65             if (isGroup)
66                 return id;
67             throw new AssertionError();
68         }
69 
isSpecial()70         boolean isSpecial() {
71             return id == -1;
72         }
73 
74         @Override
getName()75         public String getName() {
76             return name;
77         }
78 
79         @Override
toString()80         public String toString() {
81             return name;
82         }
83 
84         @Override
equals(Object obj)85         public boolean equals(Object obj) {
86             if (obj == this)
87                 return true;
88             if (!(obj instanceof User))
89                 return false;
90             User other = (User)obj;
91             if ((this.id != other.id) ||
92                 (this.isGroup != other.isGroup)) {
93                 return false;
94             }
95             // specials
96             if (this.id == -1 && other.id == -1)
97                 return this.name.equals(other.name);
98 
99             return true;
100         }
101 
102         @Override
hashCode()103         public int hashCode() {
104             return (id != -1) ? id : name.hashCode();
105         }
106     }
107 
108     static class Group extends User implements GroupPrincipal {
Group(int id, String name)109         Group(int id, String name) {
110             super(id, true, name);
111         }
112     }
113 
114     // return UserPrincipal representing given uid
fromUid(int uid)115     static User fromUid(int uid) {
116         String name = null;
117         try {
118             name = Util.toString(getpwuid(uid));
119         } catch (UnixException x) {
120             name = Integer.toString(uid);
121         }
122         return new User(uid, name);
123     }
124 
125     // return GroupPrincipal representing given gid
fromGid(int gid)126     static Group fromGid(int gid) {
127         String name = null;
128         try {
129             name = Util.toString(getgrgid(gid));
130         } catch (UnixException x) {
131             name = Integer.toString(gid);
132         }
133         return new Group(gid, name);
134     }
135 
136     // lookup user or group name
lookupName(String name, boolean isGroup)137     private static int lookupName(String name, boolean isGroup)
138         throws IOException
139     {
140         SecurityManager sm = System.getSecurityManager();
141         if (sm != null) {
142             sm.checkPermission(new RuntimePermission("lookupUserInformation"));
143         }
144         int id = -1;
145         try {
146             id = (isGroup) ? getgrnam(name) : getpwnam(name);
147         } catch (UnixException x) {
148             throw new IOException(name + ": " + x.errorString());
149         }
150         if (id == -1) {
151             // lookup failed, allow input to be uid or gid
152             try {
153                 id = Integer.parseInt(name);
154             } catch (NumberFormatException ignore) {
155                 throw new UserPrincipalNotFoundException(name);
156             }
157         }
158         return id;
159 
160     }
161 
162     // lookup user name
lookupUser(String name)163     static UserPrincipal lookupUser(String name) throws IOException {
164         if (name.equals(SPECIAL_OWNER.getName()))
165             return SPECIAL_OWNER;
166         if (name.equals(SPECIAL_GROUP.getName()))
167             return SPECIAL_GROUP;
168         if (name.equals(SPECIAL_EVERYONE.getName()))
169             return SPECIAL_EVERYONE;
170         int uid = lookupName(name, false);
171         return new User(uid, name);
172     }
173 
174     // lookup group name
lookupGroup(String group)175     static GroupPrincipal lookupGroup(String group)
176         throws IOException
177     {
178         int gid = lookupName(group, true);
179         return new Group(gid, group);
180     }
181 }
182