|
1
18
19 package jcifs.netbios;
20
21 import java.io.File  ;
22 import java.io.FileNotFoundException ;
23 import java.io.FileReader ;
24 import java.io.InputStreamReader ;
25 import java.io.Reader ;
26 import java.io.BufferedReader ;
27 import java.io.IOException ;
28 import java.util.Hashtable ;
29 import java.net.UnknownHostException ;
30 import jcifs.Config;
31 import jcifs.smb.SmbFileInputStream;
32 import jcifs.util.LogStream;
33
34 public class Lmhosts {
35
36 private static final String FILENAME = Config.getProperty( "jcifs.netbios.lmhosts" );
37 private static final Hashtable TAB = new Hashtable ();
38 private static long lastModified = 1L;
39 private static int alt;
40 private static LogStream log = LogStream.getInstance();
41
42
48
49 public synchronized static NbtAddress getByName( String host ) {
50 return getByName( new Name( host, 0x20, null ));
51 }
52
53 synchronized static NbtAddress getByName( Name name ) {
54 NbtAddress result = null;
55
56 try {
57 if( FILENAME != null ) {
58 File f = new File ( FILENAME );
59 long lm;
60
61 if(( lm = f.lastModified() ) > lastModified ) {
62 lastModified = lm;
63 TAB.clear();
64 alt = 0;
65 populate( new FileReader ( f ));
66 }
67 result = (NbtAddress)TAB.get( name );
68 }
69 } catch( FileNotFoundException fnfe ) {
70 if( log.level > 1 ) {
71 log.println( "lmhosts file: " + FILENAME );
72 fnfe.printStackTrace( log );
73 }
74 } catch( IOException ioe ) {
75 if( log.level > 0 )
76 ioe.printStackTrace( log );
77 }
78 return result;
79 }
80
81 static void populate( Reader r ) throws IOException {
82 String line;
83 BufferedReader br = new BufferedReader ( r );
84
85 while(( line = br.readLine() ) != null ) {
86 line = line.toUpperCase().trim();
87 if( line.length() == 0 ) {
88 continue;
89 } else if( line.charAt( 0 ) == '#' ) {
90 if( line.startsWith( "#INCLUDE " )) {
91 line = line.substring( line.indexOf( '\\' ));
92 String url = "smb:" + line.replace( '\\', '/' );
93
94 if( alt > 0 ) {
95 try {
96 populate( new InputStreamReader ( new SmbFileInputStream( url )));
97 } catch( IOException ioe ) {
98 log.println( "lmhosts URL: " + url );
99 ioe.printStackTrace( log );
100 continue;
101 }
102
103
106
107 alt--;
108 while(( line = br.readLine() ) != null ) {
109 line = line.toUpperCase().trim();
110 if( line.startsWith( "#END_ALTERNATE" )) {
111 break;
112 }
113 }
114 } else {
115 populate( new InputStreamReader ( new SmbFileInputStream( url )));
116 }
117 } else if( line.startsWith( "#BEGIN_ALTERNATE" )) {
118 alt++;
119 } else if( line.startsWith( "#END_ALTERNATE" ) && alt > 0 ) {
120 alt--;
121 throw new IOException ( "no lmhosts alternate includes loaded" );
122 }
123 } else if( Character.isDigit( line.charAt( 0 ))) {
124 char[] data = line.toCharArray();
125 int ip, i, j;
126 Name name;
127 NbtAddress addr;
128 char c;
129
130 c = '.';
131 ip = i = 0;
132 for( ; i < data.length && c == '.'; i++ ) {
133 int b = 0x00;
134
135 for( ; i < data.length && ( c = data[i] ) >= 48 && c <= 57; i++ ) {
136 b = b * 10 + c - '0';
137 }
138 ip = ( ip << 8 ) + b;
139 }
140 while( i < data.length && Character.isWhitespace( data[i] )) {
141 i++;
142 }
143 j = i;
144 while( j < data.length && Character.isWhitespace( data[j] ) == false ) {
145 j++;
146 }
147
148 name = new Name( line.substring( i, j ), 0x20, null );
149 addr = new NbtAddress( name, ip, false, NbtAddress.B_NODE,
150 false, false, true, true,
151 NbtAddress.UNKNOWN_MAC_ADDRESS );
152 TAB.put( name, addr );
153 }
154 }
155 }
156 }
157 |
Popular Tags |
Java API By Example, From Geeks To Geeks.