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UpnpSearcher.cs
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UpnpSearcher.cs
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using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using Mono.Nat.Upnp;
using System.Diagnostics;
using System.Net.Sockets;
using System.Net.NetworkInformation;
namespace Mono.Nat
{
internal class UpnpSearcher : ISearcher
{
internal const string WanIPUrn = "urn:schemas-upnp-org:service:WANIPConnection:1";
private const int SearchPeriod = 5 * 60; // The time in seconds between each search
static UpnpSearcher instance = new UpnpSearcher();
public static List<UdpClient> sockets = CreateSockets();
public static UpnpSearcher Instance
{
get { return instance; }
}
public event EventHandler<DeviceEventArgs> DeviceFound;
public event EventHandler<DeviceEventArgs> DeviceLost;
private List<INatDevice> devices;
private Dictionary<IPAddress, DateTime> lastFetched;
private DateTime nextSearch;
private IPEndPoint searchEndpoint;
UpnpSearcher()
{
devices = new List<INatDevice>();
lastFetched = new Dictionary<IPAddress, DateTime>();
searchEndpoint = new IPEndPoint(IPAddress.Parse("239.255.255.250"), 1900);
}
static List<UdpClient> CreateSockets()
{
List<UdpClient> clients = new List<UdpClient>();
try
{
foreach (NetworkInterface n in NetworkInterface.GetAllNetworkInterfaces())
{
foreach (UnicastIPAddressInformation address in n.GetIPProperties().UnicastAddresses)
{
if (address.Address.AddressFamily == AddressFamily.InterNetwork)
{
try
{
clients.Add(new UdpClient(new IPEndPoint(address.Address, 0)));
}
catch
{
continue; // Move on to the next address.
}
}
}
}
}
catch (Exception)
{
clients.Add(new UdpClient(0));
}
return clients;
}
public void Search()
{
foreach (UdpClient s in sockets)
{
try
{
Search(s);
}
catch
{
// Ignore any search errors
}
}
}
void Search(UdpClient client)
{
nextSearch = DateTime.Now.AddSeconds(SearchPeriod);
byte[] data = DiscoverDeviceMessage.Encode();
// UDP is unreliable, so send 3 requests at a time (per Upnp spec, sec 1.1.2)
for (int i = 0; i < 3; i++)
client.Send(data, data.Length, searchEndpoint);
}
public IPEndPoint SearchEndpoint
{
get { return searchEndpoint; }
}
public void Handle(IPAddress localAddress, byte[] response, IPEndPoint endpoint)
{
// Convert it to a string for easy parsing
string dataString = null;
// No matter what, this method should never throw an exception. If something goes wrong
// we should still be in a position to handle the next reply correctly.
try
{
dataString = Encoding.UTF8.GetString(response);
if (NatUtility.Verbose)
NatUtility.Log("UPnP Response: {0}", dataString);
// If this device does not have a WANIPConnection service, then ignore it
// Technically i should be checking for WANIPConnection:1 and InternetGatewayDevice:1
// but there are some routers missing the '1'.
string log = "UPnP Response: Router advertised a '{0}' service";
StringComparison c = StringComparison.OrdinalIgnoreCase;
if (dataString.IndexOf("urn:schemas-upnp-org:service:WANIPConnection:", c) != -1)
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANIPConnection:");
else if (dataString.IndexOf("urn:schemas-upnp-org:device:InternetGatewayDevice:", c) != -1)
NatUtility.Log(log, "urn:schemas-upnp-org:device:InternetGatewayDevice:");
else if (dataString.IndexOf("urn:schemas-upnp-org:service:WANPPPConnection:", c) != -1)
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANPPPConnection:");
else
return;
// We have an internet gateway device now
UpnpNatDevice d = new UpnpNatDevice(localAddress, dataString, WanIPUrn);
if (this.devices.Contains(d))
{
// We already have found this device, so we just refresh it to let people know it's
// Still alive. If a device doesn't respond to a search, we dump it.
this.devices[this.devices.IndexOf(d)].LastSeen = DateTime.Now;
}
else
{
// If we send 3 requests at a time, ensure we only fetch the services list once
// even if three responses are received
if (lastFetched.ContainsKey(endpoint.Address))
{
DateTime last = lastFetched[endpoint.Address];
if ((DateTime.Now - last) < TimeSpan.FromSeconds(20))
return;
}
lastFetched[endpoint.Address] = DateTime.Now;
// Once we've parsed the information we need, we tell the device to retrieve it's service list
// Once we successfully receive the service list, the callback provided will be invoked.
NatUtility.Log("Fetching service list: {0}", d.HostEndPoint);
d.GetServicesList(new NatDeviceCallback(DeviceSetupComplete));
}
}
catch (Exception ex)
{
Trace.WriteLine("Unhandled exception when trying to decode a device's response Send me the following data: ");
Trace.WriteLine("ErrorMessage:");
Trace.WriteLine(ex.Message);
Trace.WriteLine("Data string:");
Trace.WriteLine(dataString);
}
}
public DateTime NextSearch
{
get { return nextSearch; }
}
private void DeviceSetupComplete(INatDevice device)
{
lock (this.devices)
{
// We don't want the same device in there twice
if (devices.Contains(device))
return;
devices.Add(device);
}
OnDeviceFound(new DeviceEventArgs(device));
}
private void OnDeviceFound(DeviceEventArgs args)
{
if (DeviceFound != null)
DeviceFound(this, args);
}
}
}