summaryrefslogtreecommitdiffstats
path: root/avahi-sharp/ServiceBrowser.cs
blob: 520e339582182ef3d17d951736f512b7ae0ce7dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
/* $Id$ */

/***
  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;
            }
        }
    }
}