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using System;
using System.Net;
using System.Collections;
using System.Runtime.InteropServices;
namespace Avahi
{
internal delegate void ServiceBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr name, IntPtr type, IntPtr domain, IntPtr userdata);
public struct ServiceInfo
{
public int NetworkInterface;
public Protocol Protocol;
public string Domain;
public string ServiceType;
public string Name;
public string Host;
public IPAddress Address;
public UInt16 Port;
public byte[][] Text;
public static ServiceInfo Zero = new ServiceInfo ();
}
public delegate void ServiceInfoHandler (object o, ServiceInfo info);
public class ServiceBrowser : 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 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, IntPtr type,
IntPtr domain, 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)
{
}
public ServiceBrowser (Client client, int iface, Protocol proto, string type, string domain)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.domain = domain;
this.type = type;
}
~ServiceBrowser ()
{
Dispose ();
}
public void Dispose ()
{
Stop (true);
}
private void Start ()
{
if (handle != IntPtr.Zero || (addListeners.Count == 0 && removeListeners.Count == 0))
return;
IntPtr domainPtr = Utility.StringToPtr (domain);
IntPtr typePtr = Utility.StringToPtr (type);
handle = avahi_service_browser_new (client.Handle, iface, (int) proto, typePtr, domainPtr,
OnServiceBrowserCallback, IntPtr.Zero);
Utility.Free (domainPtr);
Utility.Free (typePtr);
}
private void Stop (bool force)
{
if (handle != IntPtr.Zero && (force || (addListeners.Count == 0 && removeListeners.Count == 0))) {
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, 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.Host = null;
info.Address = null;
info.Port = 0;
info.Text = null;
infos.Add (info);
if (bevent == BrowserEvent.Added) {
infos.Add (info);
foreach (ServiceInfoHandler handler in addListeners)
handler (this, info);
} else {
infos.Remove (info);
foreach (ServiceInfoHandler handler in removeListeners)
handler (this, info);
}
}
}
}
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