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/* $Id: ServiceBrowser.cs 635 2005-09-26 03:57:30Z snorp $ */
/***
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
{
public delegate void RecordInfoHandler (object o, RecordInfoArgs args);
internal delegate void RecordBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr name, ushort clazz, ushort type, IntPtr rdata, int size,
LookupResultFlags flags, IntPtr userdata);
public enum RecordClass {
In = 1
}
public enum RecordType {
A = 1,
Ns = 2,
Cname = 5,
Soa = 6,
Ptr = 12,
Hinfo = 13,
Mx = 15,
Txt = 16,
Aaa = 28,
Srv = 33
}
public struct RecordInfo
{
public int NetworkInterface;
public Protocol Protocol;
public string Name;
public RecordClass Class;
public RecordType Type;
public byte[] Data;
public LookupResultFlags Flags;
}
public class RecordInfoArgs : EventArgs
{
private RecordInfo record;
public RecordInfo Record {
get { return record; }
}
public RecordInfoArgs (RecordInfo record)
{
this.record = record;
}
}
public class RecordBrowser : BrowserBase, IDisposable
{
private IntPtr handle;
private ArrayList infos = new ArrayList ();
private Client client;
private int iface;
private Protocol proto;
private string name;
private RecordClass clazz;
private RecordType type;
private LookupFlags flags;
private RecordBrowserCallback cb;
private ArrayList addListeners = new ArrayList ();
private ArrayList removeListeners = new ArrayList ();
[DllImport ("avahi-client")]
private static extern IntPtr avahi_record_browser_new (IntPtr client, int iface, Protocol proto,
byte[] name, ushort clazz, ushort type,
LookupFlags flags, RecordBrowserCallback cb,
IntPtr userdata);
[DllImport ("avahi-client")]
private static extern void avahi_record_browser_free (IntPtr handle);
public event RecordInfoHandler RecordAdded
{
add {
addListeners.Add (value);
Start ();
}
remove {
addListeners.Remove (value);
Stop (false);
}
}
public event RecordInfoHandler RecordRemoved
{
add {
removeListeners.Add (value);
Start ();
}
remove {
removeListeners.Remove (value);
Stop (false);
}
}
public RecordInfo[] Records
{
get { return (RecordInfo[]) infos.ToArray (typeof (RecordInfo)); }
}
public RecordBrowser (Client client, string name, RecordType type) :
this (client, -1, Protocol.Unspecified, name, RecordClass.In, type, LookupFlags.None)
{
}
public RecordBrowser (Client client, int iface, Protocol proto, string name, RecordClass clazz,
RecordType type, LookupFlags flags)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.name = name;
this.clazz = clazz;
this.type = type;
this.flags = flags;
cb = OnRecordBrowserCallback;
}
~RecordBrowser ()
{
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_record_browser_new (client.Handle, iface, proto, Utility.StringToBytes (name),
(ushort) clazz, (ushort) type, 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_record_browser_free (handle);
handle = IntPtr.Zero;
}
}
}
private void OnRecordBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
IntPtr name, ushort clazz, ushort type, IntPtr rdata, int size,
LookupResultFlags flags, IntPtr userdata)
{
RecordInfo info;
info.NetworkInterface = iface;
info.Protocol = proto;
info.Name = Utility.PtrToString (name);
info.Class = (RecordClass) clazz;
info.Type = (RecordType) type;
info.Flags = flags;
info.Data = new byte[size];
if (rdata != IntPtr.Zero) {
Marshal.Copy (rdata, info.Data, 0, size);
}
switch (bevent) {
case BrowserEvent.Added:
infos.Add (info);
foreach (RecordInfoHandler handler in addListeners)
handler (this, new RecordInfoArgs (info));
break;
case BrowserEvent.Removed:
infos.Remove (info);
foreach (RecordInfoHandler handler in removeListeners)
handler (this, new RecordInfoArgs (info));
break;
default:
EmitBrowserEvent (bevent);
break;
}
}
}
}
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