public void UdpBroadcastSettings_Client()
{
try
{
UdpBroadcastClientSettings settings;
// Verify that we can read reasonable settings.
var cfg1 = @"
§ion Settings
NetworkBinding = 3.3.3.3:30
SocketBufferSize = 128K
Server[0] = 1.1.1.1:10
Server[1] = 2.2.2.2:20
SharedKey = aes:NtSkj76eyCAsJE4TnTqmPOuKd5hDDWwSS7ccTfeKEL8=:S9Xc6skGFWtxoxBaoTxJlQ==
MessageTTL = 15m
BroadcastGroup = 99
BkTaskInterval = 15s
KeepAliveInterval = 10s
ServerResolveInterval = 20s
&endsection
";
Config.SetConfig(cfg1.Replace('&', '#'));
settings = new UdpBroadcastClientSettings("Settings");
Assert.AreEqual(new NetworkBinding("3.3.3.3:30"), settings.NetworkBinding);
Assert.AreEqual(128 * 1024, settings.SocketBufferSize);
CollectionAssert.AreEqual(new NetworkBinding[] { new NetworkBinding("1.1.1.1:10"), new NetworkBinding("2.2.2.2:20") }, settings.Servers);
Assert.AreEqual(99, settings.BroadcastGroup);
Assert.AreEqual(TimeSpan.FromSeconds(15), settings.BkTaskInterval);
Assert.AreEqual(TimeSpan.FromSeconds(10), settings.KeepAliveInterval);
Assert.AreEqual(TimeSpan.FromSeconds(20), settings.ServerResolveInterval);
// Verify that an exception is thrown if no servers are specified.
Config.SetConfig(string.Empty);
try
{
settings = new UdpBroadcastClientSettings("Settings");
}
catch (Exception e)
{
Assert.IsInstanceOfType(e, typeof(FormatException));
}
}
finally
{
Config.SetConfig(null);
}
}
/// <summary>
/// Creates and starts a UDP broadcast client using the settings passed.
/// </summary>
/// <param name="settings">The client settings.</param>
/// <exception cref="ArgumentException">Thrown if the settings passed are not valid.</exception>
public UdpBroadcastClient(UdpBroadcastClientSettings settings)
{
this.settings = settings;
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (settings.Servers == null || settings.Servers.Length == 0)
{
throw new ArgumentException("Invalid UDP broadcast client settings: At least one broadcast server endpoint is required.");
}
this.servers = new List <IPEndPoint>();
// $hack(jeff.lill)
//
// This is a bit of a hack to discover the source IP address to use for this instance.
// If the configured NetworkBinding specifies a specific interface, then we'll use
// this, otherwise we'll use the IPv4 address for the first active network adaptor we find.
// In a perfect world, I'd send a packet to the broadcast servers and have it respond with
// the UDP source address it sees that would discover the actual IP address. This hack
// should work 99% of the time though.
if (!settings.NetworkBinding.Address.Equals(IPAddress.Any))
{
this.sourceAddress = settings.NetworkBinding.Address;
}
else
{
this.sourceAddress = NetHelper.GetActiveAdapter();
}
// Open the socket and start receiving packets.
socket = new EnhancedSocket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
socket.IgnoreUdpConnectionReset = true;
socket.ReceiveBufferSize = settings.SocketBufferSize;
socket.SendBufferSize = settings.SocketBufferSize;
socket.Bind(settings.NetworkBinding);
onReceive = new AsyncCallback(OnReceive);
recvBuf = new byte[8192];
rawRecvEP = new IPEndPoint(IPAddress.Any, 0);
socket.BeginReceiveFrom(recvBuf, 0, recvBuf.Length, SocketFlags.None, ref rawRecvEP, onReceive, null);
// Crank up the timers.
keepAliveTimer = new PolledTimer(settings.KeepAliveInterval, false);
keepAliveTimer.FireNow();
serverResolveTimer = new PolledTimer(settings.ServerResolveInterval, false);
serverResolveTimer.FireNow();
bkTimer = new GatedTimer(new TimerCallback(OnBkTask), null, TimeSpan.Zero, settings.BkTaskInterval);
// Sleep for a couple seconds to allow the server DNS lookups to complete.
Thread.Sleep(2000);
}
