1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.startup;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Enumeration;
/**
* Concrete implementation of the <strong>UserDatabase</code> interface
* that processes the <code>/etc/passwd</code> file on a Unix system.
*
* @author Craig R. McClanahan
*
*/
public final class PasswdUserDatabase
implements UserDatabase {
// --------------------------------------------------------- Constructors
/**
* Initialize a new instance of this user database component.
*/
public PasswdUserDatabase() {
super();
}
// --------------------------------------------------- Instance Variables
/**
* The pathname of the Unix password file.
*/
private static final String PASSWORD_FILE = "/etc/passwd";
/**
* The set of home directories for all defined users, keyed by username.
*/
private Hashtable homes = new Hashtable();
/**
* The UserConfig listener with which we are associated.
*/
private UserConfig userConfig = null;
// ----------------------------------------------------------- Properties
/**
* Return the UserConfig listener with which we are associated.
*/
public UserConfig getUserConfig() {
return (this.userConfig);
}
/**
* Set the UserConfig listener with which we are associated.
*
* @param userConfig The new UserConfig listener
*/
public void setUserConfig(UserConfig userConfig) {
this.userConfig = userConfig;
init();
}
// ------------------------------------------------------- Public Methods
/**
* Return an absolute pathname to the home directory for the specified user.
*
* @param user User for which a home directory should be retrieved
*/
public String getHome(String user) {
return ((String) homes.get(user));
}
/**
* Return an enumeration of the usernames defined on this server.
*/
public Enumeration getUsers() {
return (homes.keys());
}
// ------------------------------------------------------ Private Methods
/**
* Initialize our set of users and home directories.
*/
private void init() {
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(PASSWORD_FILE));
while (true) {
// Accumulate the next line
StringBuffer buffer = new StringBuffer();
while (true) {
int ch = reader.read();
if ((ch < 0) || (ch == '\n'))
break;
buffer.append((char) ch);
}
String line = buffer.toString();
if (line.length() < 1)
break;
// Parse the line into constituent elements
int n = 0;
String tokens[] = new String[7];
for (int i = 0; i < tokens.length; i++)
tokens[i] = null;
while (n < tokens.length) {
String token = null;
int colon = line.indexOf(':');
if (colon >= 0) {
token = line.substring(0, colon);
line = line.substring(colon + 1);
} else {
token = line;
line = "";
}
tokens[n++] = token;
}
// Add this user and corresponding directory
if ((tokens[0] != null) && (tokens[5] != null))
homes.put(tokens[0], tokens[5]);
}
reader.close();
reader = null;
} catch (Exception e) {
if (reader != null) {
try {
reader.close();
} catch (IOException f) {
;
}
reader = null;
}
}
}
}
|
