557 lines
19 KiB
C#
557 lines
19 KiB
C#
#pragma warning disable CS1591
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.NetworkInformation;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Net;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.Networking
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{
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/// <summary>
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/// Class to take care of network interface management.
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/// </summary>
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public class NetworkManager : INetworkManager
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{
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private readonly ILogger<NetworkManager> _logger;
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private IPAddress[] _localIpAddresses;
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private readonly object _localIpAddressSyncLock = new object();
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private readonly object _subnetLookupLock = new object();
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private readonly Dictionary<string, List<string>> _subnetLookup = new Dictionary<string, List<string>>(StringComparer.Ordinal);
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private List<PhysicalAddress> _macAddresses;
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/// <summary>
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/// Initializes a new instance of the <see cref="NetworkManager"/> class.
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/// </summary>
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/// <param name="logger">Logger to use for messages.</param>
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public NetworkManager(ILogger<NetworkManager> logger)
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{
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_logger = logger;
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NetworkChange.NetworkAddressChanged += OnNetworkAddressChanged;
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NetworkChange.NetworkAvailabilityChanged += OnNetworkAvailabilityChanged;
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}
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/// <inheritdoc/>
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public event EventHandler NetworkChanged;
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/// <inheritdoc/>
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public Func<string[]> LocalSubnetsFn { get; set; }
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private void OnNetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
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{
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_logger.LogDebug("NetworkAvailabilityChanged");
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OnNetworkChanged();
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}
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private void OnNetworkAddressChanged(object sender, EventArgs e)
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{
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_logger.LogDebug("NetworkAddressChanged");
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OnNetworkChanged();
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}
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private void OnNetworkChanged()
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{
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lock (_localIpAddressSyncLock)
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{
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_localIpAddresses = null;
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_macAddresses = null;
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}
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NetworkChanged?.Invoke(this, EventArgs.Empty);
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}
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/// <inheritdoc/>
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public IPAddress[] GetLocalIpAddresses()
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{
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lock (_localIpAddressSyncLock)
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{
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if (_localIpAddresses == null)
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{
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var addresses = GetLocalIpAddressesInternal().ToArray();
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_localIpAddresses = addresses;
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}
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return _localIpAddresses;
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}
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}
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private List<IPAddress> GetLocalIpAddressesInternal()
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{
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var list = GetIPsDefault().ToList();
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if (list.Count == 0)
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{
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list = GetLocalIpAddressesFallback().GetAwaiter().GetResult().ToList();
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}
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var listClone = new List<IPAddress>();
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var subnets = LocalSubnetsFn();
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foreach (var i in list)
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{
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if (i.IsIPv6LinkLocal || i.ToString().StartsWith("169.254.", StringComparison.OrdinalIgnoreCase))
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{
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continue;
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}
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if (Array.IndexOf(subnets, $"[{i}]") == -1)
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{
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listClone.Add(i);
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}
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}
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return listClone
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.OrderBy(i => i.AddressFamily == AddressFamily.InterNetwork ? 0 : 1)
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// .ThenBy(i => listClone.IndexOf(i))
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.GroupBy(i => i.ToString())
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.Select(x => x.First())
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.ToList();
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}
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/// <inheritdoc/>
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public bool IsInPrivateAddressSpace(string endpoint)
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{
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return IsInPrivateAddressSpace(endpoint, true);
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}
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// Checks if the address in endpoint is an RFC1918, RFC1122, or RFC3927 address
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private bool IsInPrivateAddressSpace(string endpoint, bool checkSubnets)
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{
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if (string.Equals(endpoint, "::1", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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// IPV6
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if (endpoint.Split('.').Length > 4)
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{
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// Handle ipv4 mapped to ipv6
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var originalEndpoint = endpoint;
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endpoint = endpoint.Replace("::ffff:", string.Empty, StringComparison.OrdinalIgnoreCase);
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if (string.Equals(endpoint, originalEndpoint, StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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}
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// Private address space:
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if (string.Equals(endpoint, "localhost", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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if (!IPAddress.TryParse(endpoint, out var ipAddress))
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{
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return false;
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}
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byte[] octet = ipAddress.GetAddressBytes();
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if ((octet[0] == 10) ||
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(octet[0] == 172 && (octet[1] >= 16 && octet[1] <= 31)) || // RFC1918
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(octet[0] == 192 && octet[1] == 168) || // RFC1918
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(octet[0] == 127) || // RFC1122
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(octet[0] == 169 && octet[1] == 254)) // RFC3927
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{
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return false;
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}
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if (checkSubnets && IsInPrivateAddressSpaceAndLocalSubnet(endpoint))
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{
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return true;
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}
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return false;
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}
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/// <inheritdoc/>
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public bool IsInPrivateAddressSpaceAndLocalSubnet(string endpoint)
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{
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if (endpoint.StartsWith("10.", StringComparison.OrdinalIgnoreCase))
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{
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var endpointFirstPart = endpoint.Split('.')[0];
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var subnets = GetSubnets(endpointFirstPart);
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foreach (var subnet_Match in subnets)
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{
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// logger.LogDebug("subnet_Match:" + subnet_Match);
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if (endpoint.StartsWith(subnet_Match + ".", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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}
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}
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return false;
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}
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// Gives a list of possible subnets from the system whose interface ip starts with endpointFirstPart
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private List<string> GetSubnets(string endpointFirstPart)
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{
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lock (_subnetLookupLock)
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{
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if (_subnetLookup.TryGetValue(endpointFirstPart, out var subnets))
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{
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return subnets;
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}
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subnets = new List<string>();
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foreach (var adapter in NetworkInterface.GetAllNetworkInterfaces())
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{
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foreach (var unicastIPAddressInformation in adapter.GetIPProperties().UnicastAddresses)
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{
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if (unicastIPAddressInformation.Address.AddressFamily == AddressFamily.InterNetwork && endpointFirstPart == unicastIPAddressInformation.Address.ToString().Split('.')[0])
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{
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int subnet_Test = 0;
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foreach (string part in unicastIPAddressInformation.IPv4Mask.ToString().Split('.'))
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{
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if (part.Equals("0", StringComparison.Ordinal))
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{
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break;
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}
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subnet_Test++;
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}
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var subnet_Match = string.Join(".", unicastIPAddressInformation.Address.ToString().Split('.').Take(subnet_Test).ToArray());
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// TODO: Is this check necessary?
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if (adapter.OperationalStatus == OperationalStatus.Up)
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{
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subnets.Add(subnet_Match);
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}
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}
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}
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}
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_subnetLookup[endpointFirstPart] = subnets;
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return subnets;
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}
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}
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/// <inheritdoc/>
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public bool IsInLocalNetwork(string endpoint)
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{
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return IsInLocalNetworkInternal(endpoint, true);
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}
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/// <inheritdoc/>
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public bool IsAddressInSubnets(string addressString, string[] subnets)
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{
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return IsAddressInSubnets(IPAddress.Parse(addressString), addressString, subnets);
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}
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/// <inheritdoc/>
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public bool IsAddressInSubnets(IPAddress address, bool excludeInterfaces, bool excludeRFC)
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{
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byte[] octet = address.GetAddressBytes();
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if ((octet[0] == 127) || // RFC1122
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(octet[0] == 169 && octet[1] == 254)) // RFC3927
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{
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// don't use on loopback or 169 interfaces
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return false;
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}
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string addressString = address.ToString();
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string excludeAddress = "[" + addressString + "]";
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var subnets = LocalSubnetsFn();
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// Include any address if LAN subnets aren't specified
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if (subnets.Length == 0)
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{
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return true;
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}
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// Exclude any addresses if they appear in the LAN list in [ ]
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if (Array.IndexOf(subnets, excludeAddress) != -1)
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{
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return false;
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}
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return IsAddressInSubnets(address, addressString, subnets);
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}
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/// <summary>
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/// Checks if the give address falls within the ranges given in [subnets]. The addresses in subnets can be hosts or subnets in the CIDR format.
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/// </summary>
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/// <param name="address">IPAddress version of the address.</param>
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/// <param name="addressString">The address to check.</param>
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/// <param name="subnets">If true, check against addresses in the LAN settings which have [] arroud and return true if it matches the address give in address.</param>
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/// <returns><c>false</c>if the address isn't in the subnets, <c>true</c> otherwise.</returns>
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private static bool IsAddressInSubnets(IPAddress address, string addressString, string[] subnets)
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{
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foreach (var subnet in subnets)
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{
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var normalizedSubnet = subnet.Trim();
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// Is the subnet a host address and does it match the address being passes?
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if (string.Equals(normalizedSubnet, addressString, StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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// Parse CIDR subnets and see if address falls within it.
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if (normalizedSubnet.Contains('/', StringComparison.Ordinal))
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{
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try
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{
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var ipNetwork = IPNetwork.Parse(normalizedSubnet);
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if (ipNetwork.Contains(address))
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{
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return true;
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}
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}
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catch
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{
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// Ignoring - invalid subnet passed encountered.
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}
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}
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}
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return false;
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}
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private bool IsInLocalNetworkInternal(string endpoint, bool resolveHost)
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{
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if (string.IsNullOrEmpty(endpoint))
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{
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throw new ArgumentNullException(nameof(endpoint));
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}
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if (IPAddress.TryParse(endpoint, out var address))
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{
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var addressString = address.ToString();
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var localSubnetsFn = LocalSubnetsFn;
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if (localSubnetsFn != null)
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{
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var localSubnets = localSubnetsFn();
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foreach (var subnet in localSubnets)
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{
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// Only validate if there's at least one valid entry.
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if (!string.IsNullOrWhiteSpace(subnet))
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{
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return IsAddressInSubnets(address, addressString, localSubnets) || IsInPrivateAddressSpace(addressString, false);
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}
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}
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}
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int lengthMatch = 100;
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if (address.AddressFamily == AddressFamily.InterNetwork)
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{
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lengthMatch = 4;
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if (IsInPrivateAddressSpace(addressString, true))
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{
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return true;
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}
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}
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else if (address.AddressFamily == AddressFamily.InterNetworkV6)
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{
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lengthMatch = 9;
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if (IsInPrivateAddressSpace(endpoint, true))
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{
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return true;
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}
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}
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// Should be even be doing this with ipv6?
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if (addressString.Length >= lengthMatch)
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{
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var prefix = addressString.Substring(0, lengthMatch);
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if (GetLocalIpAddresses().Any(i => i.ToString().StartsWith(prefix, StringComparison.OrdinalIgnoreCase)))
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{
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return true;
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}
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}
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}
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else if (resolveHost)
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{
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if (Uri.TryCreate(endpoint, UriKind.RelativeOrAbsolute, out var uri))
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{
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try
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{
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var host = uri.DnsSafeHost;
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_logger.LogDebug("Resolving host {0}", host);
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address = GetIpAddresses(host).Result.FirstOrDefault();
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if (address != null)
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{
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_logger.LogDebug("{0} resolved to {1}", host, address);
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return IsInLocalNetworkInternal(address.ToString(), false);
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}
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}
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catch (InvalidOperationException)
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{
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// Can happen with reverse proxy or IIS url rewriting?
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error resolving hostname");
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}
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}
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}
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return false;
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}
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private static Task<IPAddress[]> GetIpAddresses(string hostName)
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{
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return Dns.GetHostAddressesAsync(hostName);
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}
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private IEnumerable<IPAddress> GetIPsDefault()
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{
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IEnumerable<NetworkInterface> interfaces;
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try
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{
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interfaces = NetworkInterface.GetAllNetworkInterfaces()
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.Where(x => x.OperationalStatus == OperationalStatus.Up
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|| x.OperationalStatus == OperationalStatus.Unknown);
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}
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catch (NetworkInformationException ex)
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{
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_logger.LogError(ex, "Error in GetAllNetworkInterfaces");
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return Enumerable.Empty<IPAddress>();
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}
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return interfaces.SelectMany(network =>
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{
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var ipProperties = network.GetIPProperties();
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// Exclude any addresses if they appear in the LAN list in [ ]
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return ipProperties.UnicastAddresses
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.Select(i => i.Address)
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.Where(i => i.AddressFamily == AddressFamily.InterNetwork || i.AddressFamily == AddressFamily.InterNetworkV6);
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}).GroupBy(i => i.ToString())
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.Select(x => x.First());
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}
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private static async Task<IEnumerable<IPAddress>> GetLocalIpAddressesFallback()
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{
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var host = await Dns.GetHostEntryAsync(Dns.GetHostName()).ConfigureAwait(false);
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// Reverse them because the last one is usually the correct one
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// It's not fool-proof so ultimately the consumer will have to examine them and decide
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return host.AddressList
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.Where(i => i.AddressFamily == AddressFamily.InterNetwork || i.AddressFamily == AddressFamily.InterNetworkV6)
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.Reverse();
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}
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/// <summary>
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/// Gets a random port number that is currently available.
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/// </summary>
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/// <returns>System.Int32.</returns>
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public int GetRandomUnusedTcpPort()
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{
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var listener = new TcpListener(IPAddress.Any, 0);
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listener.Start();
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var port = ((IPEndPoint)listener.LocalEndpoint).Port;
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listener.Stop();
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return port;
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}
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/// <inheritdoc/>
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public int GetRandomUnusedUdpPort()
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{
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var localEndPoint = new IPEndPoint(IPAddress.Any, 0);
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using (var udpClient = new UdpClient(localEndPoint))
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{
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return ((IPEndPoint)udpClient.Client.LocalEndPoint).Port;
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}
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}
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/// <inheritdoc/>
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public List<PhysicalAddress> GetMacAddresses()
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{
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return _macAddresses ??= GetMacAddressesInternal().ToList();
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}
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private static IEnumerable<PhysicalAddress> GetMacAddressesInternal()
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=> NetworkInterface.GetAllNetworkInterfaces()
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.Where(i => i.NetworkInterfaceType != NetworkInterfaceType.Loopback)
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.Select(x => x.GetPhysicalAddress())
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.Where(x => !x.Equals(PhysicalAddress.None));
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/// <inheritdoc/>
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public bool IsInSameSubnet(IPAddress address1, IPAddress address2, IPAddress subnetMask)
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{
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IPAddress network1 = GetNetworkAddress(address1, subnetMask);
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IPAddress network2 = GetNetworkAddress(address2, subnetMask);
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return network1.Equals(network2);
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}
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private IPAddress GetNetworkAddress(IPAddress address, IPAddress subnetMask)
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{
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byte[] ipAdressBytes = address.GetAddressBytes();
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byte[] subnetMaskBytes = subnetMask.GetAddressBytes();
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if (ipAdressBytes.Length != subnetMaskBytes.Length)
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{
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throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
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}
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byte[] broadcastAddress = new byte[ipAdressBytes.Length];
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for (int i = 0; i < broadcastAddress.Length; i++)
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{
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broadcastAddress[i] = (byte)(ipAdressBytes[i] & subnetMaskBytes[i]);
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}
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return new IPAddress(broadcastAddress);
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}
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/// <inheritdoc/>
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public IPAddress GetLocalIpSubnetMask(IPAddress address)
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{
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NetworkInterface[] interfaces;
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try
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{
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var validStatuses = new[] { OperationalStatus.Up, OperationalStatus.Unknown };
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interfaces = NetworkInterface.GetAllNetworkInterfaces()
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.Where(i => validStatuses.Contains(i.OperationalStatus))
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.ToArray();
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error in GetAllNetworkInterfaces");
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return null;
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}
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foreach (NetworkInterface ni in interfaces)
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{
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foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
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{
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if (ip.Address.Equals(address) && ip.IPv4Mask != null)
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{
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return ip.IPv4Mask;
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}
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}
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}
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return null;
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}
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}
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}
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