mcs/class/Mono.Posix/Mono.Unix/UnixListener.cs

   1 //
   2 // UnixListener.cs
   3 //
   4 // Authors:
   5 //      Joe Shaw (joeshaw@novell.com)
   6 //
   7 // Copyright (C) 2004-2005 Novell, Inc.
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining a
  12 // copy of this software and associated documentation files (the "Software"),
  13 // to deal in the Software without restriction, including without limitation
  14 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15 // and/or sell copies of the Software, and to permit persons to whom the
  16 // Software is furnished to do so, subject to the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be included in
  19 // all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  27 // DEALINGS IN THE SOFTWARE.
  28 //
  29
  30
  31 using System;
  32 using System.Net;
  33 using System.Net.Sockets;
  34 using System.IO;
  35
  36 namespace Mono.Unix {
  37
  38         public class UnixListener : IDisposable {
  39                 bool disposed;
  40                 bool listening;
  41                 Socket server;
  42                 EndPoint savedEP;
  43
  44                 void Init (UnixEndPoint ep)
  45                 {
  46                         Cleanup (ep);
  47                         listening = false;
  48                         string filename = ep.Filename;
  49                         if (File.Exists (filename)) {
  50                                 Socket conn = new Socket (AddressFamily.Unix, SocketType.Stream, 0);
  51                                 try {
  52                                         conn.Connect (ep);
  53                                         conn.Close ();
  54                                         throw new InvalidOperationException ("There's already a server listening on " + filename);
  55                                 } catch (SocketException se) {
  56                                 }
  57                                 File.Delete (filename);
  58                         }
  59
  60                         server = new Socket (AddressFamily.Unix, SocketType.Stream, 0);
  61                         server.Bind (ep);
  62                         savedEP = server.LocalEndPoint;
  63                 }
  64
  65                 public UnixListener (string path)
  66                 {
  67                         if (!Directory.Exists (Path.GetDirectoryName (path)))
  68                                 Directory.CreateDirectory (Path.GetDirectoryName (path));
  69
  70                         Init (new UnixEndPoint (path));
  71                 }
  72
  73                 public UnixListener (UnixEndPoint localEndPoint)
  74                 {
  75                         if (localEndPoint == null)
  76                                 throw new ArgumentNullException ("localendPoint");
  77
  78                         Init (localEndPoint);
  79                 }
  80
  81                 public EndPoint LocalEndpoint {
  82                         get { return savedEP; }
  83                 }
  84
  85                 protected Socket Server {
  86                         get { return server; }
  87                 }
  88
  89                 public Socket AcceptSocket ()
  90                 {
  91                         CheckDisposed ();
  92                         if (!listening)
  93                                 throw new InvalidOperationException ("Socket is not listening");
  94
  95                         return server.Accept ();
  96                 }
  97
  98                 public UnixClient AcceptUnixClient ()
  99                 {
 100                         CheckDisposed ();
 101                         if (!listening)
 102                                 throw new InvalidOperationException ("Socket is not listening");
 103
 104                         return new UnixClient (AcceptSocket ());
 105                 }
 106
 107                 ~UnixListener ()
 108                 {
 109                         Dispose (false);
 110                 }
 111
 112                 public bool Pending ()
 113                 {
 114                         CheckDisposed ();
 115                         if (!listening)
 116                                 throw new InvalidOperationException ("Socket is not listening");
 117
 118                         return server.Poll (1000, SelectMode.SelectRead);
 119                 }
 120
 121                 public void Start ()
 122                 {
 123                         Start (5);
 124                 }
 125
 126                 public void Start (int backlog)
 127                 {
 128                         CheckDisposed ();
 129                         if (listening)
 130                                 return;
 131
 132                         server.Listen (backlog);
 133                         listening = true;
 134                 }
 135
 136                 public void Stop ()
 137                 {
 138                         CheckDisposed ();
 139                         Dispose (true);
 140                 }
 141
 142                 public void Dispose ()
 143                 {
 144                         Dispose (true);
 145                         GC.SuppressFinalize (this);
 146                 }
 147
 148                 protected void Dispose (bool disposing)
 149                 {
 150                         if (disposed)
 151                                 return;
 152
 153                         if (disposing) {
 154                                 if (server != null)
 155                                         server.Close ();
 156
 157                                 server = null;
 158                         }
 159
 160                         disposed = true;
 161                 }
 162
 163                 void CheckDisposed ()
 164                 {
 165                         if (disposed)
 166                                 throw new ObjectDisposedException (GetType().FullName);
 167                 }
 168
 169                 static void Cleanup (UnixEndPoint ep)
 170                 {
 171                         string path = ((UnixEndPoint) ep).Filename;
 172                         if (File.Exists (path))
 173                                 File.Delete (path);
 174                 }
 175         }
 176
 177 }