001: /*
002: * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/startup/PasswdUserDatabase.java,v 1.2 2001/07/22 20:25:13 pier Exp $
003: * $Revision: 1.2 $
004: * $Date: 2001/07/22 20:25:13 $
005: *
006: * ====================================================================
007: *
008: * The Apache Software License, Version 1.1
009: *
010: * Copyright (c) 1999 The Apache Software Foundation. All rights
011: * reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions
015: * are met:
016: *
017: * 1. Redistributions of source code must retain the above copyright
018: * notice, this list of conditions and the following disclaimer.
019: *
020: * 2. Redistributions in binary form must reproduce the above copyright
021: * notice, this list of conditions and the following disclaimer in
022: * the documentation and/or other materials provided with the
023: * distribution.
024: *
025: * 3. The end-user documentation included with the redistribution, if
026: * any, must include the following acknowlegement:
027: * "This product includes software developed by the
028: * Apache Software Foundation (http://www.apache.org/)."
029: * Alternately, this acknowlegement may appear in the software itself,
030: * if and wherever such third-party acknowlegements normally appear.
031: *
032: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033: * Foundation" must not be used to endorse or promote products derived
034: * from this software without prior written permission. For written
035: * permission, please contact apache@apache.org.
036: *
037: * 5. Products derived from this software may not be called "Apache"
038: * nor may "Apache" appear in their names without prior written
039: * permission of the Apache Group.
040: *
041: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052: * SUCH DAMAGE.
053: * ====================================================================
054: *
055: * This software consists of voluntary contributions made by many
056: * individuals on behalf of the Apache Software Foundation. For more
057: * information on the Apache Software Foundation, please see
058: * <http://www.apache.org/>.
059: *
060: * [Additional notices, if required by prior licensing conditions]
061: *
062: */
063:
064: package org.apache.catalina.startup;
065:
066: import java.io.BufferedReader;
067: import java.io.FileReader;
068: import java.io.IOException;
069: import java.util.Hashtable;
070: import java.util.Enumeration;
071:
072: /**
073: * Concrete implementation of the <strong>UserDatabase</code> interface
074: * that processes the <code>/etc/passwd</code> file on a Unix system.
075: *
076: * @author Craig R. McClanahan
077: * @version $Revision: 1.2 $ $Date: 2001/07/22 20:25:13 $
078: */
079:
080: public final class PasswdUserDatabase implements UserDatabase {
081:
082: // --------------------------------------------------------- Constructors
083:
084: /**
085: * Initialize a new instance of this user database component.
086: */
087: public PasswdUserDatabase() {
088:
089: super ();
090:
091: }
092:
093: // --------------------------------------------------- Instance Variables
094:
095: /**
096: * The pathname of the Unix password file.
097: */
098: private static final String PASSWORD_FILE = "/etc/passwd";
099:
100: /**
101: * The set of home directories for all defined users, keyed by username.
102: */
103: private Hashtable homes = new Hashtable();
104:
105: /**
106: * The UserConfig listener with which we are associated.
107: */
108: private UserConfig userConfig = null;
109:
110: // ----------------------------------------------------------- Properties
111:
112: /**
113: * Return the UserConfig listener with which we are associated.
114: */
115: public UserConfig getUserConfig() {
116:
117: return (this .userConfig);
118:
119: }
120:
121: /**
122: * Set the UserConfig listener with which we are associated.
123: *
124: * @param userConfig The new UserConfig listener
125: */
126: public void setUserConfig(UserConfig userConfig) {
127:
128: this .userConfig = userConfig;
129: init();
130:
131: }
132:
133: // ------------------------------------------------------- Public Methods
134:
135: /**
136: * Return an absolute pathname to the home directory for the specified user.
137: *
138: * @param user User for which a home directory should be retrieved
139: */
140: public String getHome(String user) {
141:
142: return ((String) homes.get(user));
143:
144: }
145:
146: /**
147: * Return an enumeration of the usernames defined on this server.
148: */
149: public Enumeration getUsers() {
150:
151: return (homes.keys());
152:
153: }
154:
155: // ------------------------------------------------------ Private Methods
156:
157: /**
158: * Initialize our set of users and home directories.
159: */
160: private void init() {
161:
162: BufferedReader reader = null;
163: try {
164:
165: reader = new BufferedReader(new FileReader(PASSWORD_FILE));
166:
167: while (true) {
168:
169: // Accumulate the next line
170: StringBuffer buffer = new StringBuffer();
171: while (true) {
172: int ch = reader.read();
173: if ((ch < 0) || (ch == '\n'))
174: break;
175: buffer.append((char) ch);
176: }
177: String line = buffer.toString();
178: if (line.length() < 1)
179: break;
180:
181: // Parse the line into constituent elements
182: int n = 0;
183: String tokens[] = new String[7];
184: for (int i = 0; i < tokens.length; i++)
185: tokens[i] = null;
186: while (n < tokens.length) {
187: String token = null;
188: int colon = line.indexOf(':');
189: if (colon >= 0) {
190: token = line.substring(0, colon);
191: line = line.substring(colon + 1);
192: } else {
193: token = line;
194: line = "";
195: }
196: tokens[n++] = token;
197: }
198:
199: // Add this user and corresponding directory
200: if ((tokens[0] != null) && (tokens[5] != null))
201: homes.put(tokens[0], tokens[5]);
202:
203: }
204:
205: reader.close();
206: reader = null;
207:
208: } catch (Exception e) {
209: if (reader != null) {
210: try {
211: reader.close();
212: } catch (IOException f) {
213: ;
214: }
215: reader = null;
216: }
217: }
218:
219: }
220:
221: }
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