/* jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen" <jcifs at samba dot org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.knowgate.jcifs.netbios;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Hashtable;
import java.net.UnknownHostException;
import com.knowgate.debug.*;
import com.knowgate.jcifs.Config;
import com.knowgate.jcifs.smb.SmbFileInputStream;
public class Lmhosts {
private static final String FILENAME = Config.getProperty( "jcifs.netbios.lmhosts" );
private static final Hashtable TAB = new Hashtable();
private static long lastModified = 1L;
private static int alt;
/**
* This is really just for {@link jcifs.UniAddress}. It does
* not throw an {@link java.net.UnknownHostException} because this
* is queried frequently and exceptions would be rather costly to
* throw on a regular basis here.
*/
public synchronized static NbtAddress getByName( String host ) {
return getByName( new Name( host, 0x20, null ));
}
synchronized static NbtAddress getByName( Name name ) {
NbtAddress result = null;
try {
if( FILENAME != null ) {
File f = new File( FILENAME );
long lm;
if(( lm = f.lastModified() ) > lastModified ) {
lastModified = lm;
TAB.clear();
alt = 0;
populate( new FileReader( f ));
}
result = (NbtAddress)TAB.get( name );
}
} catch( FileNotFoundException fnfe ) {
if( DebugFile.trace ) {
DebugFile.writeln( "lmhosts file: " + FILENAME );
new ErrorHandler(fnfe);
}
} catch( IOException ioe ) {
if( DebugFile.trace )
new ErrorHandler(ioe);
}
return result;
}
static void populate( Reader r ) throws IOException {
String line;
BufferedReader br = new BufferedReader( r );
while(( line = br.readLine() ) != null ) {
line = line.toUpperCase().trim();
if( line.length() == 0 ) {
continue;
} else if( line.charAt( 0 ) == '#' ) {
if( line.startsWith( "#INCLUDE " )) {
line = line.substring( line.indexOf( '\\' ));
String url = "smb:" + line.replace( '\\', '/' );
if( alt > 0 ) {
try {
populate( new InputStreamReader( new SmbFileInputStream( url )));
} catch( IOException ioe ) {
DebugFile.writeln( "lmhosts URL: " + url );
new ErrorHandler(ioe);
continue;
}
/* An include was loaded successfully. We can skip
* all other includes up to the #END_ALTERNATE tag.
*/
alt--;
while(( line = br.readLine() ) != null ) {
line = line.toUpperCase().trim();
if( line.startsWith( "#END_ALTERNATE" )) {
break;
}
}
} else {
populate( new InputStreamReader( new SmbFileInputStream( url )));
}
} else if( line.startsWith( "#BEGIN_ALTERNATE" )) {
alt++;
} else if( line.startsWith( "#END_ALTERNATE" ) && alt > 0 ) {
alt--;
throw new IOException( "no lmhosts alternate includes loaded" );
}
} else if( Character.isDigit( line.charAt( 0 ))) {
char[] data = line.toCharArray();
int ip, i, j;
Name name;
NbtAddress addr;
char c;
c = '.';
ip = i = 0;
for( ; i < data.length && c == '.'; i++ ) {
int b = 0x00;
for( ; i < data.length && ( c = data[i] ) >= 48 && c <= 57; i++ ) {
b = b * 10 + c - '0';
}
ip = ( ip << 8 ) + b;
}
while( i < data.length && Character.isWhitespace( data[i] )) {
i++;
}
j = i;
while( j < data.length && Character.isWhitespace( data[j] ) == false ) {
j++;
}
name = new Name( line.substring( i, j ), 0x20, null );
addr = new NbtAddress( name, ip, false, NbtAddress.B_NODE,
false, false, true, true,
NbtAddress.UNKNOWN_MAC_ADDRESS );
TAB.put( name, addr );
}
}
}
}