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/***
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;
}
}
}
}
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