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package org.apache.catalina.startup;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
/**
* Concrete implementation of the <strong>UserDatabase</code> interface
* that processes the <code>/etc/passwd</code> file on a Unix system.
*
* @author Craig R. McClanahan
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:28:09 $
*/
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<String, String> homes = new Hashtable<String, String>();
/**
* 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 homes.get(user);
}
/**
* Return an enumeration of the usernames defined on this server.
*/
public Enumeration<String> 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
StringBuilder buffer = new StringBuilder();
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;
}
}
}
}