1 files changed, 169 insertions, 0 deletions
diff --git a/trunk/avahi-sharp/HostNameResolver.cs b/trunk/avahi-sharp/HostNameResolver.cs
new file mode 100644
index 0000000..81305fd
--- /dev/null
+++ b/trunk/avahi-sharp/HostNameResolver.cs
@@ -0,0 +1,169 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+
+  avahi 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.
+
+  avahi 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 avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+using System;
+using System.Collections;
+using System.Net;
+using System.Runtime.InteropServices;
+using System.Text;
+using Mono.Unix;
+
+namespace Avahi
+{
+
+    internal delegate void HostNameResolverCallback (IntPtr resolver, int iface, Protocol proto,
+                                                     ResolverEvent revent, IntPtr hostname, IntPtr address,
+                                                     LookupResultFlags flags, IntPtr userdata);
+
+    public class HostNameResolver : ResolverBase, IDisposable
+    {
+        private IntPtr handle;
+        private Client client;
+        private int iface;
+        private Protocol proto;
+        private string hostname;
+        private Protocol aproto;
+        private LookupFlags flags;
+        private HostNameResolverCallback cb;
+
+        private IPAddress currentAddress;
+        private string currentHost;
+
+        private ArrayList foundListeners = new ArrayList ();
+        private ArrayList timeoutListeners = new ArrayList ();
+        
+        [DllImport ("avahi-client")]
+        private static extern IntPtr avahi_host_name_resolver_new (IntPtr client, int iface, Protocol proto,
+                                                                   byte[] hostname, Protocol aproto, LookupFlags flags,
+                                                                   HostNameResolverCallback cb, IntPtr userdata);
+
+        [DllImport ("avahi-client")]
+        private static extern void avahi_host_name_resolver_free (IntPtr handle);
+
+        public event HostAddressHandler Found
+        {
+            add {
+                foundListeners.Add (value);
+                Start ();
+            }
+            remove {
+                foundListeners.Remove (value);
+                Stop (false);
+            }
+        }
+        
+        public event EventHandler Timeout
+        {
+            add {
+                timeoutListeners.Add (value);
+                Start ();
+            }
+            remove {
+                timeoutListeners.Remove (value);
+                Stop (false);
+            }
+        }
+
+        public IPAddress Address
+        {
+            get { return currentAddress; }
+        }
+
+        public string HostName
+        {
+            get { return currentHost; }
+        }
+
+        public HostNameResolver (Client client, string hostname) : this (client, -1, Protocol.Unspecified,
+                                                                         hostname, Protocol.Unspecified,
+                                                                         LookupFlags.None)
+        {
+        }
+
+        public HostNameResolver (Client client, int iface, Protocol proto, string hostname,
+                                 Protocol aproto, LookupFlags flags)
+        {
+            this.client = client;
+            this.iface = iface;
+            this.proto = proto;
+            this.hostname = hostname;
+            this.aproto = aproto;
+            this.flags = flags;
+            cb = OnHostNameResolverCallback;
+        }
+
+        ~HostNameResolver ()
+        {
+            Dispose ();
+        }
+
+        public void Dispose ()
+        {
+            Stop (true);
+        }
+
+        private void Start ()
+        {
+            if (client.Handle == IntPtr.Zero || handle != IntPtr.Zero ||
+                (foundListeners.Count == 0 && timeoutListeners.Count == 0))
+                return;
+
+            lock (client) {
+                handle = avahi_host_name_resolver_new (client.Handle, iface, proto,
+                                                       Utility.StringToBytes (hostname), aproto, flags,
+                                                       cb, IntPtr.Zero);
+
+                if (handle == IntPtr.Zero)
+                    client.ThrowError ();
+            }
+        }
+
+        private void Stop (bool force)
+        {
+            if (client.Handle != IntPtr.Zero && handle != IntPtr.Zero &&
+                (force || (foundListeners.Count == 0 && timeoutListeners.Count == 0))) {
+
+                lock (client) {
+                    avahi_host_name_resolver_free (handle);
+                    handle = IntPtr.Zero;
+                }
+            }
+        }
+
+        private void OnHostNameResolverCallback (IntPtr resolver, int iface, Protocol proto,
+                                                 ResolverEvent revent, IntPtr hostname, IntPtr address,
+                                                 LookupResultFlags flags, IntPtr userdata)
+        {
+            switch (revent) {
+            case ResolverEvent.Found:
+                currentAddress = Utility.PtrToAddress (address);
+                currentHost = Utility.PtrToString (hostname);
+
+                foreach (HostAddressHandler handler in foundListeners)
+                    handler (this, new HostAddressArgs (currentHost, currentAddress));
+                break;
+            case ResolverEvent.Failure:
+                EmitFailure (client.LastError);
+                break;
+            }
+        }
+    }
+}