202 lines
7.7 KiB
C#
202 lines
7.7 KiB
C#
// This code is derived from jcifs smb client library <jcifs at samba dot org>
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// Ported by J. Arturo <webmaster at komodosoft dot net>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System.IO;
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using SharpCifs.Smb;
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using SharpCifs.Util;
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using SharpCifs.Util.Sharpen;
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namespace SharpCifs.Netbios
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{
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public class Lmhosts
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{
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private static readonly string Filename = Config.GetProperty("jcifs.netbios.lmhosts");
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private static readonly Hashtable Tab = new Hashtable();
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private static long _lastModified = 1L;
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private static int _alt;
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private static LogStream _log = LogStream.GetInstance();
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/// <summary>
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/// This is really just for
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/// <see cref="SharpCifs.UniAddress">Jcifs.UniAddress</see>
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/// . It does
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/// not throw an
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/// <see cref="UnknownHostException">Sharpen.UnknownHostException</see>
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/// because this
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/// is queried frequently and exceptions would be rather costly to
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/// throw on a regular basis here.
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/// </summary>
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public static NbtAddress GetByName(string host)
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{
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lock (typeof(Lmhosts))
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{
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return GetByName(new Name(host, 0x20, null));
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}
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}
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internal static NbtAddress GetByName(Name name)
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{
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lock (typeof(Lmhosts))
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{
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NbtAddress result = null;
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try
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{
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if (Filename != null)
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{
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FilePath f = new FilePath(Filename);
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long lm;
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if ((lm = f.LastModified()) > _lastModified)
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{
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_lastModified = lm;
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Tab.Clear();
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_alt = 0;
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//path -> fileStream
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//Populate(new FileReader(f));
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Populate(new FileReader(new FileStream(f, FileMode.Open)));
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}
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result = (NbtAddress)Tab[name];
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}
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}
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catch (FileNotFoundException fnfe)
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{
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if (_log.Level > 1)
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{
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_log.WriteLine("lmhosts file: " + Filename);
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Runtime.PrintStackTrace(fnfe, _log);
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}
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}
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catch (IOException ioe)
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{
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if (_log.Level > 0)
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{
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Runtime.PrintStackTrace(ioe, _log);
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}
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}
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return result;
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}
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}
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/// <exception cref="System.IO.IOException"></exception>
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internal static void Populate(StreamReader r)
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{
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string line;
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BufferedReader br = new BufferedReader((InputStreamReader)r);
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while ((line = br.ReadLine()) != null)
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{
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line = line.ToUpper().Trim();
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if (line.Length == 0)
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{
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}
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else
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{
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if (line[0] == '#')
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{
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if (line.StartsWith("#INCLUDE "))
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{
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line = Runtime.Substring(line, line.IndexOf('\\'));
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string url = "smb:" + line.Replace('\\', '/');
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if (_alt > 0)
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{
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try
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{
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Populate(new InputStreamReader(new SmbFileInputStream(url)));
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}
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catch (IOException ioe)
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{
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_log.WriteLine("lmhosts URL: " + url);
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Runtime.PrintStackTrace(ioe, _log);
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continue;
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}
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_alt--;
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while ((line = br.ReadLine()) != null)
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{
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line = line.ToUpper().Trim();
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if (line.StartsWith("#END_ALTERNATE"))
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{
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break;
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}
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}
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}
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else
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{
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Populate(new InputStreamReader(new SmbFileInputStream(url)));
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}
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}
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else
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{
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if (line.StartsWith("#BEGIN_ALTERNATE"))
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{
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_alt++;
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}
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else
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{
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if (line.StartsWith("#END_ALTERNATE") && _alt > 0)
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{
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_alt--;
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throw new IOException("no lmhosts alternate includes loaded");
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}
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}
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}
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}
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else
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{
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if (char.IsDigit(line[0]))
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{
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char[] data = line.ToCharArray();
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int ip;
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int i;
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int j;
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Name name;
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NbtAddress addr;
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char c;
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c = '.';
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ip = i = 0;
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for (; i < data.Length && c == '.'; i++)
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{
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int b = unchecked(0x00);
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for (; i < data.Length && (c = data[i]) >= 48 && c <= 57; i++)
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{
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b = b * 10 + c - '0';
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}
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ip = (ip << 8) + b;
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}
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while (i < data.Length && char.IsWhiteSpace(data[i]))
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{
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i++;
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}
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j = i;
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while (j < data.Length && char.IsWhiteSpace(data[j]) == false)
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{
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j++;
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}
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name = new Name(Runtime.Substring(line, i, j), unchecked(0x20), null
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);
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addr = new NbtAddress(name, ip, false, NbtAddress.BNode, false, false, true, true
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, NbtAddress.UnknownMacAddress);
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Tab.Put(name, addr);
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}
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}
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}
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}
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}
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}
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}
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