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using System;
using System.Collections;
using System.Net;
using System.Runtime.InteropServices;
using Mono.Unix;
namespace Avahi
{
internal delegate void HostNameResolverCallback (IntPtr resolver, int iface, Protocol proto,
ResolverEvent revent, IntPtr hostname, IntPtr address,
IntPtr userdata);
public class HostNameResolver : IDisposable
{
private IntPtr handle;
private Client client;
private int iface;
private Protocol proto;
private string hostname;
private Protocol aproto;
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,
IntPtr hostname, Protocol aproto,
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)
{
}
public HostNameResolver (Client client, int iface, Protocol proto, string hostname,
Protocol aproto)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.hostname = hostname;
this.aproto = aproto;
}
~HostNameResolver ()
{
Dispose ();
}
public void Dispose ()
{
Stop (true);
}
private void Start ()
{
if (handle != IntPtr.Zero || (foundListeners.Count == 0 && timeoutListeners.Count == 0))
return;
IntPtr hostPtr = Utility.StringToPtr (hostname);
handle = avahi_host_name_resolver_new (client.Handle, iface, proto, hostPtr, aproto,
OnHostNameResolverCallback, IntPtr.Zero);
Utility.Free (hostPtr);
}
private void Stop (bool force)
{
if (handle != IntPtr.Zero && (force || (foundListeners.Count == 0 && timeoutListeners.Count == 0))) {
avahi_host_name_resolver_free (handle);
handle = IntPtr.Zero;
}
}
private void OnHostNameResolverCallback (IntPtr resolver, int iface, Protocol proto,
ResolverEvent revent, IntPtr hostname, IntPtr address,
IntPtr userdata)
{
if (revent == ResolverEvent.Found) {
currentAddress = Utility.PtrToAddress (address);
currentHost = Utility.PtrToString (hostname);
foreach (HostAddressHandler handler in foundListeners)
handler (this, currentHost, currentAddress);
} else {
currentAddress = null;
currentHost = null;
foreach (EventHandler handler in timeoutListeners)
handler (this, new EventArgs ());
}
}
}
}
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