jellyfin/Emby.Server.Implementations/Networking/NetworkManager.cs

660 lines
23 KiB
C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading.Tasks;
using MediaBrowser.Common.Net;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Net;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.Networking
{
public class NetworkManager : INetworkManager
{
private readonly ILogger _logger;
private IPAddress[] _localIpAddresses;
private readonly object _localIpAddressSyncLock = new object();
public NetworkManager(ILogger<NetworkManager> logger)
{
_logger = logger;
NetworkChange.NetworkAddressChanged += OnNetworkAddressChanged;
NetworkChange.NetworkAvailabilityChanged += OnNetworkAvailabilityChanged;
}
public Func<string[]> LocalSubnetsFn { get; set; }
public event EventHandler NetworkChanged;
private void OnNetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
{
_logger.LogDebug("NetworkAvailabilityChanged");
OnNetworkChanged();
}
private void OnNetworkAddressChanged(object sender, EventArgs e)
{
_logger.LogDebug("NetworkAddressChanged");
OnNetworkChanged();
}
private void OnNetworkChanged()
{
lock (_localIpAddressSyncLock)
{
_localIpAddresses = null;
_macAddresses = null;
}
if (NetworkChanged != null)
{
NetworkChanged(this, EventArgs.Empty);
}
}
public IPAddress[] GetLocalIpAddresses(bool ignoreVirtualInterface = true)
{
lock (_localIpAddressSyncLock)
{
if (_localIpAddresses == null)
{
var addresses = GetLocalIpAddressesInternal(ignoreVirtualInterface).ToArray();
_localIpAddresses = addresses;
}
return _localIpAddresses;
}
}
private List<IPAddress> GetLocalIpAddressesInternal(bool ignoreVirtualInterface)
{
var list = GetIPsDefault(ignoreVirtualInterface).ToList();
if (list.Count == 0)
{
list = GetLocalIpAddressesFallback().GetAwaiter().GetResult().ToList();
}
var listClone = list.ToList();
return list
.OrderBy(i => i.AddressFamily == AddressFamily.InterNetwork ? 0 : 1)
.ThenBy(i => listClone.IndexOf(i))
.Where(FilterIpAddress)
.GroupBy(i => i.ToString())
.Select(x => x.First())
.ToList();
}
private static bool FilterIpAddress(IPAddress address)
{
var addressString = address.ToString();
if (addressString.StartsWith("169.", StringComparison.OrdinalIgnoreCase))
{
return false;
}
return true;
}
public bool IsInPrivateAddressSpace(string endpoint)
{
return IsInPrivateAddressSpace(endpoint, true);
}
private bool IsInPrivateAddressSpace(string endpoint, bool checkSubnets)
{
if (string.Equals(endpoint, "::1", StringComparison.OrdinalIgnoreCase))
{
return true;
}
// ipv6
if (endpoint.Split('.').Length > 4)
{
// Handle ipv4 mapped to ipv6
var originalEndpoint = endpoint;
endpoint = endpoint.Replace("::ffff:", string.Empty);
if (string.Equals(endpoint, originalEndpoint, StringComparison.OrdinalIgnoreCase))
{
return false;
}
}
// Private address space:
// http://en.wikipedia.org/wiki/Private_network
if (endpoint.StartsWith("172.", StringComparison.OrdinalIgnoreCase))
{
return Is172AddressPrivate(endpoint);
}
if (endpoint.StartsWith("localhost", StringComparison.OrdinalIgnoreCase) ||
endpoint.StartsWith("127.", StringComparison.OrdinalIgnoreCase) ||
endpoint.StartsWith("169.", StringComparison.OrdinalIgnoreCase))
{
return true;
}
if (checkSubnets && endpoint.StartsWith("192.168", StringComparison.OrdinalIgnoreCase))
{
return true;
}
if (checkSubnets && IsInPrivateAddressSpaceAndLocalSubnet(endpoint))
{
return true;
}
return false;
}
public bool IsInPrivateAddressSpaceAndLocalSubnet(string endpoint)
{
if (endpoint.StartsWith("10.", StringComparison.OrdinalIgnoreCase))
{
var endpointFirstPart = endpoint.Split('.')[0];
var subnets = GetSubnets(endpointFirstPart);
foreach (var subnet_Match in subnets)
{
//logger.LogDebug("subnet_Match:" + subnet_Match);
if (endpoint.StartsWith(subnet_Match + ".", StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
}
return false;
}
private Dictionary<string, List<string>> _subnetLookup = new Dictionary<string, List<string>>(StringComparer.Ordinal);
private List<string> GetSubnets(string endpointFirstPart)
{
lock (_subnetLookup)
{
if (_subnetLookup.TryGetValue(endpointFirstPart, out var subnets))
{
return subnets;
}
subnets = new List<string>();
foreach (var adapter in NetworkInterface.GetAllNetworkInterfaces())
{
foreach (var unicastIPAddressInformation in adapter.GetIPProperties().UnicastAddresses)
{
if (unicastIPAddressInformation.Address.AddressFamily == AddressFamily.InterNetwork && endpointFirstPart == unicastIPAddressInformation.Address.ToString().Split('.')[0])
{
int subnet_Test = 0;
foreach (string part in unicastIPAddressInformation.IPv4Mask.ToString().Split('.'))
{
if (part.Equals("0")) break;
subnet_Test++;
}
var subnet_Match = string.Join(".", unicastIPAddressInformation.Address.ToString().Split('.').Take(subnet_Test).ToArray());
// TODO: Is this check necessary?
if (adapter.OperationalStatus == OperationalStatus.Up)
{
subnets.Add(subnet_Match);
}
}
}
}
_subnetLookup[endpointFirstPart] = subnets;
return subnets;
}
}
private static bool Is172AddressPrivate(string endpoint)
{
for (var i = 16; i <= 31; i++)
{
if (endpoint.StartsWith("172." + i.ToString(CultureInfo.InvariantCulture) + ".", StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
return false;
}
public bool IsInLocalNetwork(string endpoint)
{
return IsInLocalNetworkInternal(endpoint, true);
}
public bool IsAddressInSubnets(string addressString, string[] subnets)
{
return IsAddressInSubnets(IPAddress.Parse(addressString), addressString, subnets);
}
private static bool IsAddressInSubnets(IPAddress address, string addressString, string[] subnets)
{
foreach (var subnet in subnets)
{
var normalizedSubnet = subnet.Trim();
if (string.Equals(normalizedSubnet, addressString, StringComparison.OrdinalIgnoreCase))
{
return true;
}
if (normalizedSubnet.IndexOf('/') != -1)
{
var ipnetwork = IPNetwork.Parse(normalizedSubnet);
if (ipnetwork.Contains(address))
{
return true;
}
}
}
return false;
}
private bool IsInLocalNetworkInternal(string endpoint, bool resolveHost)
{
if (string.IsNullOrEmpty(endpoint))
{
throw new ArgumentNullException(nameof(endpoint));
}
if (IPAddress.TryParse(endpoint, out var address))
{
var addressString = address.ToString();
var localSubnetsFn = LocalSubnetsFn;
if (localSubnetsFn != null)
{
var localSubnets = localSubnetsFn();
foreach (var subnet in localSubnets)
{
// only validate if there's at least one valid entry
if (!string.IsNullOrWhiteSpace(subnet))
{
return IsAddressInSubnets(address, addressString, localSubnets) || IsInPrivateAddressSpace(addressString, false);
}
}
}
int lengthMatch = 100;
if (address.AddressFamily == AddressFamily.InterNetwork)
{
lengthMatch = 4;
if (IsInPrivateAddressSpace(addressString, true))
{
return true;
}
}
else if (address.AddressFamily == AddressFamily.InterNetworkV6)
{
lengthMatch = 9;
if (IsInPrivateAddressSpace(endpoint, true))
{
return true;
}
}
// Should be even be doing this with ipv6?
if (addressString.Length >= lengthMatch)
{
var prefix = addressString.Substring(0, lengthMatch);
if (GetLocalIpAddresses().Any(i => i.ToString().StartsWith(prefix, StringComparison.OrdinalIgnoreCase)))
{
return true;
}
}
}
else if (resolveHost)
{
if (Uri.TryCreate(endpoint, UriKind.RelativeOrAbsolute, out var uri))
{
try
{
var host = uri.DnsSafeHost;
_logger.LogDebug("Resolving host {0}", host);
address = GetIpAddresses(host).Result.FirstOrDefault();
if (address != null)
{
_logger.LogDebug("{0} resolved to {1}", host, address);
return IsInLocalNetworkInternal(address.ToString(), false);
}
}
catch (InvalidOperationException)
{
// Can happen with reverse proxy or IIS url rewriting
}
catch (Exception ex)
{
_logger.LogError(ex, "Error resolving hostname");
}
}
}
return false;
}
private static Task<IPAddress[]> GetIpAddresses(string hostName)
{
return Dns.GetHostAddressesAsync(hostName);
}
private IEnumerable<IPAddress> GetIPsDefault(bool ignoreVirtualInterface)
{
IEnumerable<NetworkInterface> interfaces;
try
{
interfaces = NetworkInterface.GetAllNetworkInterfaces()
.Where(x => x.OperationalStatus == OperationalStatus.Up
|| x.OperationalStatus == OperationalStatus.Unknown);
}
catch (NetworkInformationException ex)
{
_logger.LogError(ex, "Error in GetAllNetworkInterfaces");
return Enumerable.Empty<IPAddress>();
}
return interfaces.SelectMany(network =>
{
var ipProperties = network.GetIPProperties();
// Try to exclude virtual adapters
// http://stackoverflow.com/questions/8089685/c-sharp-finding-my-machines-local-ip-address-and-not-the-vms
var addr = ipProperties.GatewayAddresses.FirstOrDefault();
if (addr == null
|| (ignoreVirtualInterface
&& (addr.Address.Equals(IPAddress.Any) || addr.Address.Equals(IPAddress.IPv6Any))))
{
return Enumerable.Empty<IPAddress>();
}
return ipProperties.UnicastAddresses
.Select(i => i.Address)
.Where(i => i.AddressFamily == AddressFamily.InterNetwork || i.AddressFamily == AddressFamily.InterNetworkV6);
}).GroupBy(i => i.ToString())
.Select(x => x.First());
}
private static async Task<IEnumerable<IPAddress>> GetLocalIpAddressesFallback()
{
var host = await Dns.GetHostEntryAsync(Dns.GetHostName()).ConfigureAwait(false);
// Reverse them because the last one is usually the correct one
// It's not fool-proof so ultimately the consumer will have to examine them and decide
return host.AddressList
.Where(i => i.AddressFamily == AddressFamily.InterNetwork || i.AddressFamily == AddressFamily.InterNetworkV6)
.Reverse();
}
/// <summary>
/// Gets a random port number that is currently available
/// </summary>
/// <returns>System.Int32.</returns>
public int GetRandomUnusedTcpPort()
{
var listener = new TcpListener(IPAddress.Any, 0);
listener.Start();
var port = ((IPEndPoint)listener.LocalEndpoint).Port;
listener.Stop();
return port;
}
public int GetRandomUnusedUdpPort()
{
var localEndPoint = new IPEndPoint(IPAddress.Any, 0);
using (var udpClient = new UdpClient(localEndPoint))
{
var port = ((IPEndPoint)(udpClient.Client.LocalEndPoint)).Port;
return port;
}
}
private List<string> _macAddresses;
public List<string> GetMacAddresses()
{
if (_macAddresses == null)
{
_macAddresses = GetMacAddressesInternal();
}
return _macAddresses;
}
private static List<string> GetMacAddressesInternal()
{
return NetworkInterface.GetAllNetworkInterfaces()
.Where(i => i.NetworkInterfaceType != NetworkInterfaceType.Loopback)
.Select(i =>
{
try
{
var physicalAddress = i.GetPhysicalAddress();
if (physicalAddress == null)
{
return null;
}
return physicalAddress.ToString();
}
catch (Exception)
{
//TODO Log exception.
return null;
}
})
.Where(i => i != null)
.ToList();
}
/// <summary>
/// Parses the specified endpointstring.
/// </summary>
/// <param name="endpointstring">The endpointstring.</param>
/// <returns>IPEndPoint.</returns>
public IPEndPoint Parse(string endpointstring)
{
return Parse(endpointstring, -1).Result;
}
/// <summary>
/// Parses the specified endpointstring.
/// </summary>
/// <param name="endpointstring">The endpointstring.</param>
/// <param name="defaultport">The defaultport.</param>
/// <returns>IPEndPoint.</returns>
/// <exception cref="ArgumentException">Endpoint descriptor may not be empty.</exception>
/// <exception cref="FormatException"></exception>
private static async Task<IPEndPoint> Parse(string endpointstring, int defaultport)
{
if (string.IsNullOrEmpty(endpointstring)
|| endpointstring.Trim().Length == 0)
{
throw new ArgumentException("Endpoint descriptor may not be empty.");
}
if (defaultport != -1 &&
(defaultport < IPEndPoint.MinPort
|| defaultport > IPEndPoint.MaxPort))
{
throw new ArgumentException(string.Format("Invalid default port '{0}'", defaultport));
}
string[] values = endpointstring.Split(new char[] { ':' });
IPAddress ipaddy;
int port = -1;
//check if we have an IPv6 or ports
if (values.Length <= 2) // ipv4 or hostname
{
port = values.Length == 1 ? defaultport : GetPort(values[1]);
//try to use the address as IPv4, otherwise get hostname
if (!IPAddress.TryParse(values[0], out ipaddy))
ipaddy = await GetIPfromHost(values[0]).ConfigureAwait(false);
}
else if (values.Length > 2) //ipv6
{
//could [a:b:c]:d
if (values[0].StartsWith("[") && values[values.Length - 2].EndsWith("]"))
{
string ipaddressstring = string.Join(":", values.Take(values.Length - 1).ToArray());
ipaddy = IPAddress.Parse(ipaddressstring);
port = GetPort(values[values.Length - 1]);
}
else //[a:b:c] or a:b:c
{
ipaddy = IPAddress.Parse(endpointstring);
port = defaultport;
}
}
else
{
throw new FormatException(string.Format("Invalid endpoint ipaddress '{0}'", endpointstring));
}
if (port == -1)
throw new ArgumentException(string.Format("No port specified: '{0}'", endpointstring));
return new IPEndPoint(ipaddy, port);
}
protected static readonly CultureInfo UsCulture = new CultureInfo("en-US");
/// <summary>
/// Gets the port.
/// </summary>
/// <param name="p">The p.</param>
/// <returns>System.Int32.</returns>
/// <exception cref="FormatException"></exception>
private static int GetPort(string p)
{
if (!int.TryParse(p, out var port)
|| port < IPEndPoint.MinPort
|| port > IPEndPoint.MaxPort)
{
throw new FormatException(string.Format("Invalid end point port '{0}'", p));
}
return port;
}
/// <summary>
/// Gets the I pfrom host.
/// </summary>
/// <param name="p">The p.</param>
/// <returns>IPAddress.</returns>
/// <exception cref="ArgumentException"></exception>
private static async Task<IPAddress> GetIPfromHost(string p)
{
var hosts = await Dns.GetHostAddressesAsync(p).ConfigureAwait(false);
if (hosts == null || hosts.Length == 0)
throw new ArgumentException(string.Format("Host not found: {0}", p));
return hosts[0];
}
public bool IsInSameSubnet(IPAddress address1, IPAddress address2, IPAddress subnetMask)
{
IPAddress network1 = GetNetworkAddress(address1, subnetMask);
IPAddress network2 = GetNetworkAddress(address2, subnetMask);
return network1.Equals(network2);
}
private IPAddress GetNetworkAddress(IPAddress address, IPAddress subnetMask)
{
byte[] ipAdressBytes = address.GetAddressBytes();
byte[] subnetMaskBytes = subnetMask.GetAddressBytes();
if (ipAdressBytes.Length != subnetMaskBytes.Length)
{
throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
}
byte[] broadcastAddress = new byte[ipAdressBytes.Length];
for (int i = 0; i < broadcastAddress.Length; i++)
{
broadcastAddress[i] = (byte)(ipAdressBytes[i] & (subnetMaskBytes[i]));
}
return new IPAddress(broadcastAddress);
}
public IPAddress GetLocalIpSubnetMask(IPAddress address)
{
NetworkInterface[] interfaces;
try
{
var validStatuses = new[] { OperationalStatus.Up, OperationalStatus.Unknown };
interfaces = NetworkInterface.GetAllNetworkInterfaces()
.Where(i => validStatuses.Contains(i.OperationalStatus))
.ToArray();
}
catch (Exception ex)
{
_logger.LogError(ex, "Error in GetAllNetworkInterfaces");
return null;
}
foreach (NetworkInterface ni in interfaces)
{
if (ni.GetIPProperties().GatewayAddresses.FirstOrDefault() != null)
{
foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
{
if (ip.Address.Equals(address) && ip.IPv4Mask != null)
{
return ip.IPv4Mask;
}
}
}
}
return null;
}
/// <summary>
/// Gets the network shares.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>IEnumerable{NetworkShare}.</returns>
public virtual IEnumerable<NetworkShare> GetNetworkShares(string path)
{
return new List<NetworkShare>();
}
/// <summary>
/// Gets available devices within the domain
/// </summary>
/// <returns>PC's in the Domain</returns>
public virtual IEnumerable<FileSystemEntryInfo> GetNetworkDevices()
{
return new List<FileSystemEntryInfo>();
}
}
}