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 : MarshalByRefObject, IDisposable {
  39                 bool disposed;
  40                 bool listening;
  41                 Socket server;
  42                 EndPoint savedEP;
  43
  44                 void Init (UnixEndPoint ep)
  45                 {
  46                         listening = false;
  47                         string filename = ep.Filename;
  48                         if (File.Exists (filename)) {
  49                                 Socket conn = new Socket (AddressFamily.Unix, SocketType.Stream, 0);
  50                                 try {
  51                                         conn.Connect (ep);
  52                                         conn.Close ();
  53                                         throw new InvalidOperationException ("There's already a server listening on " + filename);
  54                                 } catch (SocketException) {
  55                                 }
  56                                 File.Delete (filename);
  57                         }
  58
  59                         server = new Socket (AddressFamily.Unix, SocketType.Stream, 0);
  60                         server.Bind (ep);
  61                         savedEP = server.LocalEndPoint;
  62                 }
  63
  64                 public UnixListener (string path)
  65                 {
  66                         if (!Directory.Exists (Path.GetDirectoryName (path)))
  67                                 Directory.CreateDirectory (Path.GetDirectoryName (path));
  68
  69                         Init (new UnixEndPoint (path));
  70                 }
  71
  72                 public UnixListener (UnixEndPoint localEndPoint)
  73                 {
  74                         if (localEndPoint == null)
  75                                 throw new ArgumentNullException ("localendPoint");
  76
  77                         Init (localEndPoint);
  78                 }
  79
  80                 public EndPoint LocalEndpoint {
  81                         get { return savedEP; }
  82                 }
  83
  84                 protected Socket Server {
  85                         get { return server; }
  86                 }
  87
  88                 public Socket AcceptSocket ()
  89                 {
  90                         CheckDisposed ();
  91                         if (!listening)
  92                                 throw new InvalidOperationException ("Socket is not listening");
  93
  94                         return server.Accept ();
  95                 }
  96
  97                 public UnixClient AcceptUnixClient ()
  98                 {
  99                         CheckDisposed ();
 100                         if (!listening)
 101                                 throw new InvalidOperationException ("Socket is not listening");
 102
 103                         return new UnixClient (AcceptSocket ());
 104                 }
 105
 106                 ~UnixListener ()
 107                 {
 108                         Dispose (false);
 109                 }
 110
 111                 public bool Pending ()
 112                 {
 113                         CheckDisposed ();
 114                         if (!listening)
 115                                 throw new InvalidOperationException ("Socket is not listening");
 116
 117                         return server.Poll (1000, SelectMode.SelectRead);
 118                 }
 119
 120                 public void Start ()
 121                 {
 122                         Start (5);
 123                 }
 124
 125                 public void Start (int backlog)
 126                 {
 127                         CheckDisposed ();
 128                         if (listening)
 129                                 return;
 130
 131                         server.Listen (backlog);
 132                         listening = true;
 133                 }
 134
 135                 public void Stop ()
 136                 {
 137                         CheckDisposed ();
 138                         Dispose (true);
 139                 }
 140
 141                 public void Dispose ()
 142                 {
 143                         Dispose (true);
 144                         GC.SuppressFinalize (this);
 145                 }
 146
 147                 protected void Dispose (bool disposing)
 148                 {
 149                         if (disposed)
 150                                 return;
 151
 152                         if (disposing) {
 153                                 if (server != null)
 154                                         server.Close ();
 155
 156                                 server = null;
 157                         }
 158
 159                         disposed = true;
 160                 }
 161
 162                 void CheckDisposed ()
 163                 {
 164                         if (disposed)
 165                                 throw new ObjectDisposedException (GetType().FullName);
 166                 }
 167         }
 168
 169 }