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//
// Authors:
// Alan McGovern alan.mcgovern@gmail.com
// Ben Motmans <ben.motmans@gmail.com>
// Nicholas Terry <nick.i.terry@gmail.com>
//
// Copyright (C) 2006 Alan McGovern
// Copyright (C) 2007 Ben Motmans
// Copyright (C) 2014 Nicholas Terry
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
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;
using MediaBrowser.Controller.Dlna;
namespace Mono.Nat
{
internal class UpnpSearcher : ISearcher
{
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);
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.EncodeSSDP();
// 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, UpnpDeviceInfo deviceInfo, IPEndPoint endpoint)
{
// 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
{
/* For UPnP Port Mapping we need ot find either WANPPPConnection or WANIPConnection.
Any other device type is no good to us for this purpose. See the IGP overview paper
page 5 for an overview of device types and their hierarchy.
http://upnp.org/specs/gw/UPnP-gw-InternetGatewayDevice-v1-Device.pdf */
/* TODO: Currently we are assuming version 1 of the protocol. We should figure out which
version it is and apply the correct URN. */
/* Some routers don't correctly implement the version ID on the URN, so we only search for the type
prefix. */
// We have an internet gateway device now
UpnpNatDevice d = new UpnpNatDevice(localAddress, deviceInfo, endpoint, string.Empty);
if (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.
devices[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(DeviceSetupComplete);
}
}
catch (Exception ex)
{
NatUtility.Log("Unhandled exception when trying to decode a device's response Send me the following data: ");
NatUtility.Log("ErrorMessage:");
NatUtility.Log(ex.Message);
}
}
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 {
string urn;
dataString = Encoding.UTF8.GetString(response);
if (NatUtility.Verbose)
NatUtility.Log("UPnP Response: {0}", dataString);
/* For UPnP Port Mapping we need ot find either WANPPPConnection or WANIPConnection.
Any other device type is no good to us for this purpose. See the IGP overview paper
page 5 for an overview of device types and their hierarchy.
http://upnp.org/specs/gw/UPnP-gw-InternetGatewayDevice-v1-Device.pdf */
/* TODO: Currently we are assuming version 1 of the protocol. We should figure out which
version it is and apply the correct URN. */
/* Some routers don't correctly implement the version ID on the URN, so we only search for the type
prefix. */
string log = "UPnP Response: Router advertised a '{0}' service";
StringComparison c = StringComparison.OrdinalIgnoreCase;
if (dataString.IndexOf("urn:schemas-upnp-org:service:WANIPConnection:", c) != -1) {
urn = "urn:schemas-upnp-org:service:WANIPConnection:1";
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANIPConnection:1");
} else if (dataString.IndexOf("urn:schemas-upnp-org:service:WANPPPConnection:", c) != -1) {
urn = "urn:schemas-upnp-org:service:WANPPPConnection: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, urn);
if (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.
devices[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(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);
}
public NatProtocol Protocol
{
get { return NatProtocol.Upnp; }
}
}
}
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