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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.Net;
using System.Collections;
using System.Runtime.InteropServices;
using System.Text;
namespace Avahi
{
internal delegate void ServiceBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr name, IntPtr type, IntPtr domain, LookupResultFlags flags,
IntPtr userdata);
public struct ServiceInfo
{
public int NetworkInterface;
public Protocol Protocol;
public string Domain;
public string ServiceType;
public string Name;
public string HostName;
public IPAddress Address;
public UInt16 Port;
public byte[][] Text;
public LookupResultFlags Flags;
public static ServiceInfo Zero = new ServiceInfo ();
}
public class ServiceInfoArgs : EventArgs
{
private ServiceInfo service;
public ServiceInfo Service {
get { return service; }
}
public ServiceInfoArgs (ServiceInfo service)
{
this.service = service;
}
}
public delegate void ServiceInfoHandler (object o, ServiceInfoArgs args);
public class ServiceBrowser : BrowserBase, IDisposable
{
private IntPtr handle;
private ArrayList infos = new ArrayList ();
private Client client;
private int iface;
private Protocol proto;
private string domain;
private string type;
private LookupFlags flags;
private ServiceBrowserCallback cb;
private ArrayList addListeners = new ArrayList ();
private ArrayList removeListeners = new ArrayList ();
[DllImport ("avahi-client")]
private static extern IntPtr avahi_service_browser_new (IntPtr client, int iface, int proto, byte[] type,
byte[] domain, LookupFlags flags,
ServiceBrowserCallback cb,
IntPtr userdata);
[DllImport ("avahi-client")]
private static extern void avahi_service_browser_free (IntPtr handle);
public event ServiceInfoHandler ServiceAdded
{
add {
addListeners.Add (value);
Start ();
}
remove {
addListeners.Remove (value);
Stop (false);
}
}
public event ServiceInfoHandler ServiceRemoved
{
add {
removeListeners.Add (value);
Start ();
}
remove {
removeListeners.Remove (value);
Stop (false);
}
}
public ServiceInfo[] Services
{
get { return (ServiceInfo[]) infos.ToArray (typeof (ServiceInfo)); }
}
public ServiceBrowser (Client client, string type) : this (client, type, client.DomainName)
{
}
public ServiceBrowser (Client client, string type, string domain) : this (client, -1, Protocol.Unspecified,
type, domain, LookupFlags.None)
{
}
public ServiceBrowser (Client client, int iface, Protocol proto, string type, string domain, LookupFlags flags)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.domain = domain;
this.type = type;
this.flags = flags;
cb = OnServiceBrowserCallback;
}
~ServiceBrowser ()
{
Dispose ();
}
public void Dispose ()
{
Stop (true);
}
private void Start ()
{
if (client.Handle == IntPtr.Zero || handle != IntPtr.Zero ||
(addListeners.Count == 0 && removeListeners.Count == 0))
return;
lock (client) {
handle = avahi_service_browser_new (client.Handle, iface, (int) proto,
Utility.StringToBytes (type), Utility.StringToBytes (domain),
flags, cb, IntPtr.Zero);
if (handle == IntPtr.Zero)
client.ThrowError ();
}
}
private void Stop (bool force)
{
if (client.Handle != IntPtr.Zero && handle != IntPtr.Zero &&
(force || (addListeners.Count == 0 && removeListeners.Count == 0))) {
lock (client) {
avahi_service_browser_free (handle);
handle = IntPtr.Zero;
}
}
}
private void OnServiceBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr name, IntPtr type, IntPtr domain, LookupResultFlags flags,
IntPtr userdata)
{
ServiceInfo info;
info.NetworkInterface = iface;
info.Protocol = proto;
info.Domain = Utility.PtrToString (domain);
info.ServiceType = Utility.PtrToString (type);
info.Name = Utility.PtrToString (name);
info.HostName = null;
info.Address = null;
info.Port = 0;
info.Text = null;
info.Flags = flags;
switch (bevent) {
case BrowserEvent.Added:
infos.Add (info);
foreach (ServiceInfoHandler handler in addListeners)
handler (this, new ServiceInfoArgs (info));
break;
case BrowserEvent.Removed:
infos.Remove (info);
foreach (ServiceInfoHandler handler in removeListeners)
handler (this, new ServiceInfoArgs (info));
break;
default:
EmitBrowserEvent (bevent);
break;
}
}
}
}
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