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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 ServiceResolverCallback (IntPtr resolver, int iface, Protocol proto,
ResolverEvent revent, IntPtr name, IntPtr type,
IntPtr domain, IntPtr host, IntPtr address,
UInt16 port, IntPtr txt, LookupResultFlags flags,
IntPtr userdata);
public class ServiceResolver : ResolverBase, IDisposable
{
private IntPtr handle;
private ServiceInfo currentInfo;
private Client client;
private int iface;
private Protocol proto;
private string name;
private string type;
private string domain;
private Protocol aproto;
private LookupFlags flags;
private ServiceResolverCallback cb;
private ArrayList foundListeners = new ArrayList ();
private ArrayList timeoutListeners = new ArrayList ();
[DllImport ("avahi-client")]
private static extern IntPtr avahi_service_resolver_new (IntPtr client, int iface, Protocol proto,
byte[] name, byte[] type, byte[] domain,
Protocol aproto, LookupFlags flags,
ServiceResolverCallback cb,
IntPtr userdata);
[DllImport ("avahi-common")]
private static extern IntPtr avahi_string_list_get_next (IntPtr list);
[DllImport ("avahi-common")]
private static extern IntPtr avahi_string_list_get_text (IntPtr list);
[DllImport ("avahi-common")]
private static extern int avahi_string_list_get_size (IntPtr list);
[DllImport ("avahi-client")]
private static extern void avahi_service_resolver_free (IntPtr handle);
public event ServiceInfoHandler 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 ServiceInfo Service
{
get { return currentInfo; }
}
public ServiceResolver (Client client, string name, string type, string domain) : this (client, -1,
Protocol.Unspecified,
name, type, domain,
Protocol.Unspecified,
LookupFlags.None)
{
}
public ServiceResolver (Client client, ServiceInfo service) : this (client, service.NetworkInterface,
service.Protocol, service.Name,
service.ServiceType, service.Domain,
Protocol.Unspecified,
GetLookupFlags (service.Flags))
{
}
public ServiceResolver (Client client, int iface, Protocol proto, string name,
string type, string domain, Protocol aproto, LookupFlags flags)
{
this.client = client;
this.iface = iface;
this.proto = proto;
this.name = name;
this.type = type;
this.domain = domain;
this.aproto = aproto;
this.flags = flags;
cb = OnServiceResolverCallback;
}
~ServiceResolver ()
{
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_service_resolver_new (client.Handle, iface, proto,
Utility.StringToBytes (name), Utility.StringToBytes (type),
Utility.StringToBytes (domain), 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_service_resolver_free (handle);
handle = IntPtr.Zero;
}
}
}
private void OnServiceResolverCallback (IntPtr resolver, int iface, Protocol proto,
ResolverEvent revent, IntPtr name, IntPtr type,
IntPtr domain, IntPtr host, IntPtr address,
UInt16 port, IntPtr txt, 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 = Utility.PtrToString (host);
info.Address = Utility.PtrToAddress (address);
info.Port = port;
if (proto == Protocol.IPv6)
info.Address.ScopeId = iface;
ArrayList txtlist = new ArrayList ();
for (IntPtr l = txt; l != IntPtr.Zero; l = avahi_string_list_get_next (l)) {
IntPtr buf = avahi_string_list_get_text (l);
int len = avahi_string_list_get_size (l);
byte[] txtbuf = new byte[len];
Marshal.Copy (buf, txtbuf, 0, len);
txtlist.Add (txtbuf);
}
info.Text = (byte[][]) txtlist.ToArray (typeof (byte[]));
info.Flags = flags;
switch (revent) {
case ResolverEvent.Found:
currentInfo = info;
foreach (ServiceInfoHandler handler in foundListeners)
handler (this, new ServiceInfoArgs (info));
break;
case ResolverEvent.Failure:
EmitFailure (client.LastError);
break;
}
}
private static LookupFlags GetLookupFlags (LookupResultFlags rflags) {
LookupFlags ret = LookupFlags.None;
if ((rflags & LookupResultFlags.Multicast) > 0)
ret |= LookupFlags.UseMulticast;
if ((rflags & LookupResultFlags.WideArea) > 0)
ret |= LookupFlags.UseWideArea;
return ret;
}
}
}
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