Extract networking constants

Emby.Dlna/Main/DlnaEntryPoint.cs

@@ -11,6 +11,7 @@ using System.Threading.Tasks;
 using Emby.Dlna.PlayTo;
 using Emby.Dlna.Ssdp;
 using Jellyfin.Networking.Configuration;
+using Jellyfin.Networking.Extensions;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Common.Extensions;
 using MediaBrowser.Common.Net;

Emby.Server.Implementations/EntryPoints/UdpServerEntryPoint.cs

@@ -7,6 +7,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Emby.Server.Implementations.Udp;
 using Jellyfin.Networking.Configuration;
+using Jellyfin.Networking.Extensions;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Common.Net;
 using MediaBrowser.Controller;

Jellyfin.Networking/Constants/Network.cs

@@ -0,0 +1,75 @@
+using System.Net;
+using Microsoft.AspNetCore.HttpOverrides;
+
+namespace Jellyfin.Networking.Constants;
+
+/// <summary>
+/// Networking constants.
+/// </summary>
+public static class Network
+{
+    /// <summary>
+    /// IPv4 mask bytes.
+    /// </summary>
+    public const int IPv4MaskBytes = 4;
+
+    /// <summary>
+    /// IPv6 mask bytes.
+    /// </summary>
+    public const int IPv6MaskBytes = 16;
+
+    /// <summary>
+    /// Minimum IPv4 prefix size.
+    /// </summary>
+    public const int MinimumIPv4PrefixSize = 32;
+
+    /// <summary>
+    /// Minimum IPv6 prefix size.
+    /// </summary>
+    public const int MinimumIPv6PrefixSize = 128;
+
+    /// <summary>
+    /// Whole IPv4 address space.
+    /// </summary>
+    public static readonly IPNetwork IPv4Any = new IPNetwork(IPAddress.Any, 0);
+
+    /// <summary>
+    /// Whole IPv6 address space.
+    /// </summary>
+    public static readonly IPNetwork IPv6Any = new IPNetwork(IPAddress.IPv6Any, 0);
+
+    /// <summary>
+    /// IPv4 Loopback as defined in RFC 5735.
+    /// </summary>
+    public static readonly IPNetwork IPv4RFC5735Loopback = new IPNetwork(IPAddress.Loopback, 8);
+
+    /// <summary>
+    /// IPv4 private class A as defined in RFC 1918.
+    /// </summary>
+    public static readonly IPNetwork IPv4RFC1918PrivateClassA = new IPNetwork(IPAddress.Parse("10.0.0.0"), 8);
+
+    /// <summary>
+    /// IPv4 private class B as defined in RFC 1918.
+    /// </summary>
+    public static readonly IPNetwork IPv4RFC1918PrivateClassB = new IPNetwork(IPAddress.Parse("172.16.0.0"), 12);
+
+    /// <summary>
+    /// IPv4 private class C as defined in RFC 1918.
+    /// </summary>
+    public static readonly IPNetwork IPv4RFC1918PrivateClassC = new IPNetwork(IPAddress.Parse("192.168.0.0"), 16);
+
+    /// <summary>
+    /// IPv6 loopback as defined in RFC 4291.
+    /// </summary>
+    public static readonly IPNetwork IPv6RFC4291Loopback = new IPNetwork(IPAddress.IPv6Loopback, 128);
+
+    /// <summary>
+    /// IPv6 site local as defined in RFC 4291.
+    /// </summary>
+    public static readonly IPNetwork IPv6RFC4291SiteLocal = new IPNetwork(IPAddress.Parse("fe80::"), 10);
+
+    /// <summary>
+    /// IPv6 unique local as defined in RFC 4193.
+    /// </summary>
+    public static readonly IPNetwork IPv6RFC4193UniqueLocal = new IPNetwork(IPAddress.Parse("fc00::"), 7);
+}

Jellyfin.Networking/Extensions/NetworkExtensions.cs

@@ -0,0 +1,351 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text.RegularExpressions;
+using Jellyfin.Extensions;
+using Jellyfin.Networking.Constants;
+using Microsoft.AspNetCore.HttpOverrides;
+
+namespace Jellyfin.Networking.Extensions;
+
+/// <summary>
+/// Defines the <see cref="NetworkExtensions" />.
+/// </summary>
+public static partial class NetworkExtensions
+{
+    // Use regular expression as CheckHostName isn't RFC5892 compliant.
+    // Modified from gSkinner's expression at https://stackoverflow.com/questions/11809631/fully-qualified-domain-name-validation
+    [GeneratedRegex(@"(?im)^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){0,127}(?![0-9]*$)[a-z0-9-]+\.?)(:(\d){1,5}){0,1}$", RegexOptions.IgnoreCase, "en-US")]
+    private static partial Regex fqdnGeneratedRegex();
+
+    /// <summary>
+    /// Returns true if the IPAddress contains an IP6 Local link address.
+    /// </summary>
+    /// <param name="address">IPAddress object to check.</param>
+    /// <returns>True if it is a local link address.</returns>
+    /// <remarks>
+    /// See https://stackoverflow.com/questions/6459928/explain-the-instance-properties-of-system-net-ipaddress
+    /// it appears that the IPAddress.IsIPv6LinkLocal is out of date.
+    /// </remarks>
+    public static bool IsIPv6LinkLocal(IPAddress address)
+    {
+        ArgumentNullException.ThrowIfNull(address);
+
+        if (address.IsIPv4MappedToIPv6)
+        {
+            address = address.MapToIPv4();
+        }
+
+        if (address.AddressFamily != AddressFamily.InterNetworkV6)
+        {
+            return false;
+        }
+
+        // GetAddressBytes
+        Span<byte> octet = stackalloc byte[16];
+        address.TryWriteBytes(octet, out _);
+        uint word = (uint)(octet[0] << 8) + octet[1];
+
+        return word >= 0xfe80 && word <= 0xfebf; // fe80::/10 :Local link.
+    }
+
+    /// <summary>
+    /// Convert a subnet mask in CIDR notation to a dotted decimal string value. IPv4 only.
+    /// </summary>
+    /// <param name="cidr">Subnet mask in CIDR notation.</param>
+    /// <param name="family">IPv4 or IPv6 family.</param>
+    /// <returns>String value of the subnet mask in dotted decimal notation.</returns>
+    public static IPAddress CidrToMask(byte cidr, AddressFamily family)
+    {
+        uint addr = 0xFFFFFFFF << ((family == AddressFamily.InterNetwork ? Network.MinimumIPv4PrefixSize : Network.MinimumIPv6PrefixSize) - cidr);
+        addr = ((addr & 0xff000000) >> 24)
+                | ((addr & 0x00ff0000) >> 8)
+                | ((addr & 0x0000ff00) << 8)
+                | ((addr & 0x000000ff) << 24);
+        return new IPAddress(addr);
+    }
+
+    /// <summary>
+    /// Convert a subnet mask in CIDR notation to a dotted decimal string value. IPv4 only.
+    /// </summary>
+    /// <param name="cidr">Subnet mask in CIDR notation.</param>
+    /// <param name="family">IPv4 or IPv6 family.</param>
+    /// <returns>String value of the subnet mask in dotted decimal notation.</returns>
+    public static IPAddress CidrToMask(int cidr, AddressFamily family)
+    {
+        uint addr = 0xFFFFFFFF << ((family == AddressFamily.InterNetwork ? Network.MinimumIPv4PrefixSize : Network.MinimumIPv6PrefixSize) - cidr);
+        addr = ((addr & 0xff000000) >> 24)
+                | ((addr & 0x00ff0000) >> 8)
+                | ((addr & 0x0000ff00) << 8)
+                | ((addr & 0x000000ff) << 24);
+        return new IPAddress(addr);
+    }
+
+    /// <summary>
+    /// Convert a subnet mask to a CIDR. IPv4 only.
+    /// https://stackoverflow.com/questions/36954345/get-cidr-from-netmask.
+    /// </summary>
+    /// <param name="mask">Subnet mask.</param>
+    /// <returns>Byte CIDR representing the mask.</returns>
+    public static byte MaskToCidr(IPAddress mask)
+    {
+        ArgumentNullException.ThrowIfNull(mask);
+
+        byte cidrnet = 0;
+        if (mask.Equals(IPAddress.Any))
+        {
+            return cidrnet;
+        }
+
+        // GetAddressBytes
+        Span<byte> bytes = stackalloc byte[mask.AddressFamily == AddressFamily.InterNetwork ? Network.IPv4MaskBytes : Network.IPv6MaskBytes];
+        if (!mask.TryWriteBytes(bytes, out var bytesWritten))
+        {
+            Console.WriteLine("Unable to write address bytes, only {bytesWritten} bytes written.");
+        }
+
+        var zeroed = false;
+        for (var i = 0; i < bytes.Length; i++)
+        {
+            for (int v = bytes[i]; (v & 0xFF) != 0; v <<= 1)
+            {
+                if (zeroed)
+                {
+                    // Invalid netmask.
+                    return (byte)~cidrnet;
+                }
+
+                if ((v & 0x80) == 0)
+                {
+                    zeroed = true;
+                }
+                else
+                {
+                    cidrnet++;
+                }
+            }
+        }
+
+        return cidrnet;
+    }
+
+    /// <summary>
+    /// Converts an IPAddress into a string.
+    /// IPv6 addresses are returned in [ ], with their scope removed.
+    /// </summary>
+    /// <param name="address">Address to convert.</param>
+    /// <returns>URI safe conversion of the address.</returns>
+    public static string FormatIPString(IPAddress? address)
+    {
+        if (address is null)
+        {
+            return string.Empty;
+        }
+
+        var str = address.ToString();
+        if (address.AddressFamily == AddressFamily.InterNetworkV6)
+        {
+            int i = str.IndexOf('%', StringComparison.Ordinal);
+            if (i != -1)
+            {
+                str = str.Substring(0, i);
+            }
+
+            return $"[{str}]";
+        }
+
+        return str;
+    }
+
+    /// <summary>
+    /// Try parsing an array of strings into <see cref="IPNetwork"/> objects, respecting exclusions.
+    /// Elements without a subnet mask will be represented as <see cref="IPNetwork"/> with a single IP.
+    /// </summary>
+    /// <param name="values">Input string array to be parsed.</param>
+    /// <param name="result">Collection of <see cref="IPNetwork"/>.</param>
+    /// <param name="negated">Boolean signaling if negated or not negated values should be parsed.</param>
+    /// <returns><c>True</c> if parsing was successful.</returns>
+    public static bool TryParseToSubnets(string[] values, [NotNullWhen(true)] out IReadOnlyList<IPNetwork>? result, bool negated = false)
+    {
+        if (values is null || values.Length == 0)
+        {
+            result = null;
+            return false;
+        }
+
+        var tmpResult = new List<IPNetwork>();
+        for (int a = 0; a < values.Length; a++)
+        {
+            if (TryParseToSubnet(values[a], out var innerResult, negated))
+            {
+                tmpResult.Add(innerResult);
+            }
+        }
+
+        result = tmpResult;
+        return tmpResult.Count > 0;
+    }
+
+    /// <summary>
+    /// Try parsing a string into an <see cref="IPNetwork"/>, respecting exclusions.
+    /// Inputs without a subnet mask will be represented as <see cref="IPNetwork"/> with a single IP.
+    /// </summary>
+    /// <param name="value">Input string to be parsed.</param>
+    /// <param name="result">An <see cref="IPNetwork"/>.</param>
+    /// <param name="negated">Boolean signaling if negated or not negated values should be parsed.</param>
+    /// <returns><c>True</c> if parsing was successful.</returns>
+    public static bool TryParseToSubnet(ReadOnlySpan<char> value, [NotNullWhen(true)] out IPNetwork? result, bool negated = false)
+    {
+        var splitString = value.Trim().Split('/');
+        if (splitString.MoveNext())
+        {
+            var ipBlock = splitString.Current;
+            var address = IPAddress.None;
+            if (negated && ipBlock.StartsWith<char>("!") && IPAddress.TryParse(ipBlock[1..], out var tmpAddress))
+            {
+                address = tmpAddress;
+            }
+            else if (!negated && IPAddress.TryParse(ipBlock, out tmpAddress))
+            {
+                address = tmpAddress;
+            }
+
+            if (address != IPAddress.None)
+            {
+                if (splitString.MoveNext())
+                {
+                    var subnetBlock = splitString.Current;
+                    if (int.TryParse(subnetBlock, out var netmask))
+                    {
+                        result = new IPNetwork(address, netmask);
+                        return true;
+                    }
+                    else if (IPAddress.TryParse(subnetBlock, out var netmaskAddress))
+                    {
+                        result = new IPNetwork(address, NetworkExtensions.MaskToCidr(netmaskAddress));
+                        return true;
+                    }
+                }
+                else if (address.AddressFamily == AddressFamily.InterNetwork)
+                {
+                    result = new IPNetwork(address, Network.MinimumIPv4PrefixSize);
+                    return true;
+                }
+                else if (address.AddressFamily == AddressFamily.InterNetworkV6)
+                {
+                    result = new IPNetwork(address, Network.MinimumIPv6PrefixSize);
+                    return true;
+                }
+            }
+        }
+
+        result = null;
+        return false;
+    }
+
+    /// <summary>
+    /// Attempts to parse a host span.
+    /// </summary>
+    /// <param name="host">Host name to parse.</param>
+    /// <param name="addresses">Object representing the span, if it has successfully been parsed.</param>
+    /// <param name="isIPv4Enabled"><c>true</c> if IPv4 is enabled.</param>
+    /// <param name="isIPv6Enabled"><c>true</c> if IPv6 is enabled.</param>
+    /// <returns><c>true</c> if the parsing is successful, <c>false</c> if not.</returns>
+    public static bool TryParseHost(ReadOnlySpan<char> host, [NotNullWhen(true)] out IPAddress[]? addresses, bool isIPv4Enabled = true, bool isIPv6Enabled = false)
+    {
+        if (host.IsEmpty)
+        {
+            addresses = null;
+            return false;
+        }
+
+        host = host.Trim();
+
+        // See if it's an IPv6 with port address e.g. [::1] or [::1]:120.
+        if (host[0] == '[')
+        {
+            int i = host.IndexOf(']');
+            if (i != -1)
+            {
+                return TryParseHost(host[1..(i - 1)], out addresses);
+            }
+
+            addresses = Array.Empty<IPAddress>();
+            return false;
+        }
+
+        var hosts = new List<string>();
+        foreach (var splitSpan in host.Split(':'))
+        {
+            hosts.Add(splitSpan.ToString());
+        }
+
+        if (hosts.Count <= 2)
+        {
+            // Is hostname or hostname:port
+            if (fqdnGeneratedRegex().IsMatch(hosts[0]))
+            {
+                try
+                {
+                    addresses = Dns.GetHostAddresses(hosts[0]);
+                    return true;
+                }
+                catch (SocketException)
+                {
+                    // Log and then ignore socket errors, as the result value will just be an empty array.
+                    Console.WriteLine("GetHostAddresses failed.");
+                }
+            }
+
+            // Is an IPv4 or IPv4:port
+            if (IPAddress.TryParse(hosts[0].AsSpan().LeftPart('/'), out var address))
+            {
+                if (((address.AddressFamily == AddressFamily.InterNetwork) && (!isIPv4Enabled && isIPv6Enabled))
+                    || ((address.AddressFamily == AddressFamily.InterNetworkV6) && (isIPv4Enabled && !isIPv6Enabled)))
+                {
+                    addresses = Array.Empty<IPAddress>();
+                    return false;
+                }
+
+                addresses = new[] { address };
+
+                // Host name is an IPv4 address, so fake resolve.
+                return true;
+            }
+        }
+        else if (hosts.Count > 0 && hosts.Count <= 9) // 8 octets + port
+        {
+            if (IPAddress.TryParse(host.LeftPart('/'), out var address))
+            {
+                addresses = new[] { address };
+                return true;
+            }
+        }
+
+        addresses = Array.Empty<IPAddress>();
+        return false;
+    }
+
+    /// <summary>
+    /// Gets the broadcast address for a <see cref="IPNetwork"/>.
+    /// </summary>
+    /// <param name="network">The <see cref="IPNetwork"/>.</param>
+    /// <returns>The broadcast address.</returns>
+    public static IPAddress GetBroadcastAddress(IPNetwork network)
+    {
+        var addressBytes = network.Prefix.GetAddressBytes();
+        if (BitConverter.IsLittleEndian)
+        {
+            addressBytes = addressBytes.Reverse().ToArray();
+        }
+
+        uint iPAddress = BitConverter.ToUInt32(addressBytes, 0);
+        uint ipMaskV4 = BitConverter.ToUInt32(CidrToMask(network.PrefixLength, AddressFamily.InterNetwork).GetAddressBytes(), 0);
+        uint broadCastIPAddress = iPAddress | ~ipMaskV4;
+
+        return new IPAddress(BitConverter.GetBytes(broadCastIPAddress));
+    }
+}

Jellyfin.Networking/Manager/NetworkManager.cs

@@ -8,6 +8,8 @@ using System.Net.NetworkInformation;
 using System.Net.Sockets;
 using System.Threading;
 using Jellyfin.Networking.Configuration;
+using Jellyfin.Networking.Constants;
+using Jellyfin.Networking.Extensions;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Common.Net;
 using MediaBrowser.Model.Net;
@@ -316,17 +318,17 @@ namespace Jellyfin.Networking.Manager
                     var fallbackLanSubnets = new List<IPNetwork>();
                     if (IsIPv6Enabled)
                     {
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.IPv6Loopback, 128)); // RFC 4291 (Loopback)
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Parse("fe80::"), 10)); // RFC 4291 (Site local)
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Parse("fc00::"), 7)); // RFC 4193 (Unique local)
+                        fallbackLanSubnets.Add(Network.IPv6RFC4291Loopback); // RFC 4291 (Loopback)
+                        fallbackLanSubnets.Add(Network.IPv6RFC4291SiteLocal); // RFC 4291 (Site local)
+                        fallbackLanSubnets.Add(Network.IPv6RFC4193UniqueLocal); // RFC 4193 (Unique local)
                     }
 
                     if (IsIPv4Enabled)
                     {
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Loopback, 8)); // RFC 5735 (Loopback)
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Parse("10.0.0.0"), 8)); // RFC 1918 (private)
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Parse("172.16.0.0"), 12)); // RFC 1918 (private)
-                        fallbackLanSubnets.Add(new IPNetwork(IPAddress.Parse("192.168.0.0"), 16)); // RFC 1918 (private)
+                        fallbackLanSubnets.Add(Network.IPv4RFC5735Loopback); // RFC 5735 (Loopback)
+                        fallbackLanSubnets.Add(Network.IPv4RFC1918PrivateClassA); // RFC 1918 (private Class A)
+                        fallbackLanSubnets.Add(Network.IPv4RFC1918PrivateClassB); // RFC 1918 (private Class B)
+                        fallbackLanSubnets.Add(Network.IPv4RFC1918PrivateClassC); // RFC 1918 (private Class C)
                     }
 
                     _lanSubnets = fallbackLanSubnets;
@@ -369,12 +371,12 @@ namespace Jellyfin.Networking.Manager
 
                     if (bindAddresses.Contains(IPAddress.Loopback))
                     {
-                        interfaces.Add(new IPData(IPAddress.Loopback, new IPNetwork(IPAddress.Loopback, 8), "lo"));
+                        interfaces.Add(new IPData(IPAddress.Loopback, Network.IPv4RFC5735Loopback, "lo"));
                     }
 
                     if (bindAddresses.Contains(IPAddress.IPv6Loopback))
                     {
-                        interfaces.Add(new IPData(IPAddress.IPv6Loopback, new IPNetwork(IPAddress.IPv6Loopback, 128), "lo"));
+                        interfaces.Add(new IPData(IPAddress.IPv6Loopback, Network.IPv6RFC4291Loopback, "lo"));
                     }
                 }
 
@@ -437,7 +439,7 @@ namespace Jellyfin.Networking.Manager
                     {
                         if (IPAddress.TryParse(ip, out var ipp))
                         {
-                            remoteAddressFilter.Add(new IPNetwork(ipp, ipp.AddressFamily == AddressFamily.InterNetwork ? 32 : 128));
+                            remoteAddressFilter.Add(new IPNetwork(ipp, ipp.AddressFamily == AddressFamily.InterNetwork ? Network.MinimumIPv4PrefixSize : Network.MinimumIPv6PrefixSize));
                         }
                     }
 
@@ -477,8 +479,8 @@ namespace Jellyfin.Networking.Manager
                     }
                     else if (string.Equals(identifier, "external", StringComparison.OrdinalIgnoreCase))
                     {
-                        publishedServerUrls[new IPData(IPAddress.Any, new IPNetwork(IPAddress.Any, 0))] = replacement;
-                        publishedServerUrls[new IPData(IPAddress.IPv6Any, new IPNetwork(IPAddress.IPv6Any, 0))] = replacement;
+                        publishedServerUrls[new IPData(IPAddress.Any, Network.IPv4Any)] = replacement;
+                        publishedServerUrls[new IPData(IPAddress.IPv6Any, Network.IPv6Any)] = replacement;
                     }
                     else if (string.Equals(identifier, "internal", StringComparison.OrdinalIgnoreCase))
                     {
@@ -656,12 +658,12 @@ namespace Jellyfin.Networking.Manager
             var loopbackNetworks = new List<IPData>();
             if (IsIPv4Enabled)
             {
-                loopbackNetworks.Add(new IPData(IPAddress.Loopback, new IPNetwork(IPAddress.Loopback, 8), "lo"));
+                loopbackNetworks.Add(new IPData(IPAddress.Loopback, Network.IPv4RFC5735Loopback, "lo"));
             }
 
             if (IsIPv6Enabled)
             {
-                loopbackNetworks.Add(new IPData(IPAddress.IPv6Loopback, new IPNetwork(IPAddress.IPv6Loopback, 128), "lo"));
+                loopbackNetworks.Add(new IPData(IPAddress.IPv6Loopback, Network.IPv6RFC4291Loopback, "lo"));
             }
 
             return loopbackNetworks;
@@ -687,11 +689,11 @@ namespace Jellyfin.Networking.Manager
             if (IsIPv4Enabled && IsIPv6Enabled)
             {
                 // Kestrel source code shows it uses Sockets.DualMode - so this also covers IPAddress.Any by default
-                result.Add(new IPData(IPAddress.IPv6Any, new IPNetwork(IPAddress.IPv6Any, 0)));
+                result.Add(new IPData(IPAddress.IPv6Any, Network.IPv6Any));
             }
             else if (IsIPv4Enabled)
             {
-                result.Add(new IPData(IPAddress.Any, new IPNetwork(IPAddress.Any, 0)));
+                result.Add(new IPData(IPAddress.Any, Network.IPv4Any));
             }
             else if (IsIPv6Enabled)
             {
@@ -1047,7 +1049,7 @@ namespace Jellyfin.Networking.Manager
             }
 
             // Fallback to first external interface.
-            result = NetworkExtensions.FormatIPString(extResult.First().Address);
+            result = NetworkExtensions.FormatIPString(extResult[0].Address);
             _logger.LogDebug("{Source}: Using first external interface as bind address: {Result}", source, result);
             return true;
         }

Jellyfin.Server/Extensions/ApiServiceCollectionExtensions.cs

@@ -21,9 +21,10 @@ using Jellyfin.Api.ModelBinders;
 using Jellyfin.Data.Enums;
 using Jellyfin.Extensions.Json;
 using Jellyfin.Networking.Configuration;
+using Jellyfin.Networking.Constants;
+using Jellyfin.Networking.Extensions;
 using Jellyfin.Server.Configuration;
 using Jellyfin.Server.Filters;
-using MediaBrowser.Common.Net;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.Session;
 using Microsoft.AspNetCore.Authentication;
@@ -271,7 +272,7 @@ namespace Jellyfin.Server.Extensions
             {
                 if (IPAddress.TryParse(allowedProxies[i], out var addr))
                 {
-                    AddIPAddress(config, options, addr, addr.AddressFamily == AddressFamily.InterNetwork ? 32 : 128);
+                    AddIPAddress(config, options, addr, addr.AddressFamily == AddressFamily.InterNetwork ? Network.MinimumIPv4PrefixSize : Network.MinimumIPv6PrefixSize);
                 }
                 else if (NetworkExtensions.TryParseToSubnet(allowedProxies[i], out var subnet))
                 {
@@ -284,7 +285,7 @@ namespace Jellyfin.Server.Extensions
                 {
                     foreach (var address in addresses)
                     {
-                        AddIPAddress(config, options, address, address.AddressFamily == AddressFamily.InterNetwork ? 32 : 128);
+                        AddIPAddress(config, options, address, address.AddressFamily == AddressFamily.InterNetwork ? Network.MinimumIPv4PrefixSize : Network.MinimumIPv6PrefixSize);
                     }
                 }
             }
@@ -292,17 +293,17 @@ namespace Jellyfin.Server.Extensions
 
         private static void AddIPAddress(NetworkConfiguration config, ForwardedHeadersOptions options, IPAddress addr, int prefixLength)
         {
-            if ((!config.EnableIPv4 && addr.AddressFamily == AddressFamily.InterNetwork) || (!config.EnableIPv6 && addr.AddressFamily == AddressFamily.InterNetworkV6))
-            {
-                return;
-            }
-
             if (addr.IsIPv4MappedToIPv6)
             {
                 addr = addr.MapToIPv4();
             }
 
-            if (prefixLength == 32)
+            if ((!config.EnableIPv4 && addr.AddressFamily == AddressFamily.InterNetwork) || (!config.EnableIPv6 && addr.AddressFamily == AddressFamily.InterNetworkV6))
+            {
+                return;
+            }
+
+            if (prefixLength == Network.MinimumIPv4PrefixSize)
             {
                 options.KnownProxies.Add(addr);
             }

MediaBrowser.Common/Net/NetworkExtensions.cs

@@ -1,350 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using System.Linq;
-using System.Net;
-using System.Net.Sockets;
-using System.Text.RegularExpressions;
-using Jellyfin.Extensions;
-using Microsoft.AspNetCore.HttpOverrides;
-
-namespace MediaBrowser.Common.Net
-{
-    /// <summary>
-    /// Defines the <see cref="NetworkExtensions" />.
-    /// </summary>
-    public static class NetworkExtensions
-    {
-        // Use regular expression as CheckHostName isn't RFC5892 compliant.
-        // Modified from gSkinner's expression at https://stackoverflow.com/questions/11809631/fully-qualified-domain-name-validation
-        private static readonly Regex _fqdnRegex = new Regex(@"(?im)^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){0,127}(?![0-9]*$)[a-z0-9-]+\.?)(:(\d){1,5}){0,1}$");
-
-        /// <summary>
-        /// Returns true if the IPAddress contains an IP6 Local link address.
-        /// </summary>
-        /// <param name="address">IPAddress object to check.</param>
-        /// <returns>True if it is a local link address.</returns>
-        /// <remarks>
-        /// See https://stackoverflow.com/questions/6459928/explain-the-instance-properties-of-system-net-ipaddress
-        /// it appears that the IPAddress.IsIPv6LinkLocal is out of date.
-        /// </remarks>
-        public static bool IsIPv6LinkLocal(IPAddress address)
-        {
-            ArgumentNullException.ThrowIfNull(address);
-
-            if (address.IsIPv4MappedToIPv6)
-            {
-                address = address.MapToIPv4();
-            }
-
-            if (address.AddressFamily != AddressFamily.InterNetworkV6)
-            {
-                return false;
-            }
-
-            // GetAddressBytes
-            Span<byte> octet = stackalloc byte[16];
-            address.TryWriteBytes(octet, out _);
-            uint word = (uint)(octet[0] << 8) + octet[1];
-
-            return word >= 0xfe80 && word <= 0xfebf; // fe80::/10 :Local link.
-        }
-
-        /// <summary>
-        /// Convert a subnet mask in CIDR notation to a dotted decimal string value. IPv4 only.
-        /// </summary>
-        /// <param name="cidr">Subnet mask in CIDR notation.</param>
-        /// <param name="family">IPv4 or IPv6 family.</param>
-        /// <returns>String value of the subnet mask in dotted decimal notation.</returns>
-        public static IPAddress CidrToMask(byte cidr, AddressFamily family)
-        {
-            uint addr = 0xFFFFFFFF << ((family == AddressFamily.InterNetwork ? 32 : 128) - cidr);
-            addr = ((addr & 0xff000000) >> 24)
-                   | ((addr & 0x00ff0000) >> 8)
-                   | ((addr & 0x0000ff00) << 8)
-                   | ((addr & 0x000000ff) << 24);
-            return new IPAddress(addr);
-        }
-
-        /// <summary>
-        /// Convert a subnet mask in CIDR notation to a dotted decimal string value. IPv4 only.
-        /// </summary>
-        /// <param name="cidr">Subnet mask in CIDR notation.</param>
-        /// <param name="family">IPv4 or IPv6 family.</param>
-        /// <returns>String value of the subnet mask in dotted decimal notation.</returns>
-        public static IPAddress CidrToMask(int cidr, AddressFamily family)
-        {
-            uint addr = 0xFFFFFFFF << ((family == AddressFamily.InterNetwork ? 32 : 128) - cidr);
-            addr = ((addr & 0xff000000) >> 24)
-                   | ((addr & 0x00ff0000) >> 8)
-                   | ((addr & 0x0000ff00) << 8)
-                   | ((addr & 0x000000ff) << 24);
-            return new IPAddress(addr);
-        }
-
-        /// <summary>
-        /// Convert a subnet mask to a CIDR. IPv4 only.
-        /// https://stackoverflow.com/questions/36954345/get-cidr-from-netmask.
-        /// </summary>
-        /// <param name="mask">Subnet mask.</param>
-        /// <returns>Byte CIDR representing the mask.</returns>
-        public static byte MaskToCidr(IPAddress mask)
-        {
-            ArgumentNullException.ThrowIfNull(mask);
-
-            byte cidrnet = 0;
-            if (mask.Equals(IPAddress.Any))
-            {
-                return cidrnet;
-            }
-
-            // GetAddressBytes
-            Span<byte> bytes = stackalloc byte[mask.AddressFamily == AddressFamily.InterNetwork ? 4 : 16];
-            if (!mask.TryWriteBytes(bytes, out var bytesWritten))
-            {
-                Console.WriteLine("Unable to write address bytes, only {Bytes} bytes written.", bytesWritten);
-            }
-
-            var zeroed = false;
-            for (var i = 0; i < bytes.Length; i++)
-            {
-                for (int v = bytes[i]; (v & 0xFF) != 0; v <<= 1)
-                {
-                    if (zeroed)
-                    {
-                        // Invalid netmask.
-                        return (byte)~cidrnet;
-                    }
-
-                    if ((v & 0x80) == 0)
-                    {
-                        zeroed = true;
-                    }
-                    else
-                    {
-                        cidrnet++;
-                    }
-                }
-            }
-
-            return cidrnet;
-        }
-
-        /// <summary>
-        /// Converts an IPAddress into a string.
-        /// IPv6 addresses are returned in [ ], with their scope removed.
-        /// </summary>
-        /// <param name="address">Address to convert.</param>
-        /// <returns>URI safe conversion of the address.</returns>
-        public static string FormatIPString(IPAddress? address)
-        {
-            if (address is null)
-            {
-                return string.Empty;
-            }
-
-            var str = address.ToString();
-            if (address.AddressFamily == AddressFamily.InterNetworkV6)
-            {
-                int i = str.IndexOf('%', StringComparison.Ordinal);
-                if (i != -1)
-                {
-                    str = str.Substring(0, i);
-                }
-
-                return $"[{str}]";
-            }
-
-            return str;
-        }
-
-        /// <summary>
-        /// Try parsing an array of strings into <see cref="IPNetwork"/> objects, respecting exclusions.
-        /// Elements without a subnet mask will be represented as <see cref="IPNetwork"/> with a single IP.
-        /// </summary>
-        /// <param name="values">Input string array to be parsed.</param>
-        /// <param name="result">Collection of <see cref="IPNetwork"/>.</param>
-        /// <param name="negated">Boolean signaling if negated or not negated values should be parsed.</param>
-        /// <returns><c>True</c> if parsing was successful.</returns>
-        public static bool TryParseToSubnets(string[] values, [NotNullWhen(true)] out IReadOnlyList<IPNetwork>? result, bool negated = false)
-        {
-            if (values is null || values.Length == 0)
-            {
-                result = null;
-                return false;
-            }
-
-            var tmpResult = new List<IPNetwork>();
-            for (int a = 0; a < values.Length; a++)
-            {
-                if (TryParseToSubnet(values[a], out var innerResult, negated))
-                {
-                    tmpResult.Add(innerResult);
-                }
-            }
-
-            result = tmpResult;
-            return tmpResult.Count > 0;
-        }
-
-        /// <summary>
-        /// Try parsing a string into an <see cref="IPNetwork"/>, respecting exclusions.
-        /// Inputs without a subnet mask will be represented as <see cref="IPNetwork"/> with a single IP.
-        /// </summary>
-        /// <param name="value">Input string to be parsed.</param>
-        /// <param name="result">An <see cref="IPNetwork"/>.</param>
-        /// <param name="negated">Boolean signaling if negated or not negated values should be parsed.</param>
-        /// <returns><c>True</c> if parsing was successful.</returns>
-        public static bool TryParseToSubnet(ReadOnlySpan<char> value, [NotNullWhen(true)] out IPNetwork? result, bool negated = false)
-        {
-            var splitString = value.Trim().Split('/');
-            if (splitString.MoveNext())
-            {
-                var ipBlock = splitString.Current;
-                var address = IPAddress.None;
-                if (negated && ipBlock.StartsWith("!") && IPAddress.TryParse(ipBlock[1..], out var tmpAddress))
-                {
-                    address = tmpAddress;
-                }
-                else if (!negated && IPAddress.TryParse(ipBlock, out tmpAddress))
-                {
-                    address = tmpAddress;
-                }
-
-                if (address != IPAddress.None)
-                {
-                    if (splitString.MoveNext())
-                    {
-                        var subnetBlock = splitString.Current;
-                        if (int.TryParse(subnetBlock, out var netmask))
-                        {
-                            result = new IPNetwork(address, netmask);
-                            return true;
-                        }
-                        else if (IPAddress.TryParse(subnetBlock, out var netmaskAddress))
-                        {
-                            result = new IPNetwork(address, NetworkExtensions.MaskToCidr(netmaskAddress));
-                            return true;
-                        }
-                    }
-                    else if (address.AddressFamily == AddressFamily.InterNetwork)
-                    {
-                        result = new IPNetwork(address, 32);
-                        return true;
-                    }
-                    else if (address.AddressFamily == AddressFamily.InterNetworkV6)
-                    {
-                        result = new IPNetwork(address, 128);
-                        return true;
-                    }
-                }
-            }
-
-            result = null;
-            return false;
-        }
-
-        /// <summary>
-        /// Attempts to parse a host span.
-        /// </summary>
-        /// <param name="host">Host name to parse.</param>
-        /// <param name="addresses">Object representing the span, if it has successfully been parsed.</param>
-        /// <param name="isIPv4Enabled"><c>true</c> if IPv4 is enabled.</param>
-        /// <param name="isIPv6Enabled"><c>true</c> if IPv6 is enabled.</param>
-        /// <returns><c>true</c> if the parsing is successful, <c>false</c> if not.</returns>
-        public static bool TryParseHost(ReadOnlySpan<char> host, [NotNullWhen(true)] out IPAddress[]? addresses, bool isIPv4Enabled = true, bool isIPv6Enabled = false)
-        {
-            if (host.IsEmpty)
-            {
-                addresses = null;
-                return false;
-            }
-
-            host = host.Trim();
-
-            // See if it's an IPv6 with port address e.g. [::1] or [::1]:120.
-            if (host[0] == '[')
-            {
-                int i = host.IndexOf("]", StringComparison.Ordinal);
-                if (i != -1)
-                {
-                    return TryParseHost(host[1..(i - 1)], out addresses);
-                }
-
-                addresses = Array.Empty<IPAddress>();
-                return false;
-            }
-
-            var hosts = new List<string>();
-            foreach (var splitSpan in host.Split(':'))
-            {
-                hosts.Add(splitSpan.ToString());
-            }
-
-            if (hosts.Count <= 2)
-            {
-                // Is hostname or hostname:port
-                if (_fqdnRegex.IsMatch(hosts[0]))
-                {
-                    try
-                    {
-                        addresses = Dns.GetHostAddresses(hosts[0]);
-                        return true;
-                    }
-                    catch (SocketException)
-                    {
-                        // Log and then ignore socket errors, as the result value will just be an empty array.
-                        Console.WriteLine("GetHostAddresses failed.");
-                    }
-                }
-
-                // Is an IP4 or IP4:port
-                if (IPAddress.TryParse(hosts[0].AsSpan().LeftPart('/'), out var address))
-                {
-                    if (((address.AddressFamily == AddressFamily.InterNetwork) && (!isIPv4Enabled && isIPv6Enabled))
-                        || ((address.AddressFamily == AddressFamily.InterNetworkV6) && (isIPv4Enabled && !isIPv6Enabled)))
-                    {
-                        addresses = Array.Empty<IPAddress>();
-                        return false;
-                    }
-
-                    addresses = new[] { address };
-
-                    // Host name is an ip4 address, so fake resolve.
-                    return true;
-                }
-            }
-            else if (hosts.Count > 0 && hosts.Count <= 9) // 8 octets + port
-            {
-                if (IPAddress.TryParse(host.LeftPart('/'), out var address))
-                {
-                    addresses = new[] { address };
-                    return true;
-                }
-            }
-
-            addresses = Array.Empty<IPAddress>();
-            return false;
-        }
-
-        /// <summary>
-        /// Gets the broadcast address for a <see cref="IPNetwork"/>.
-        /// </summary>
-        /// <param name="network">The <see cref="IPNetwork"/>.</param>
-        /// <returns>The broadcast address.</returns>
-        public static IPAddress GetBroadcastAddress(IPNetwork network)
-        {
-            var addressBytes = network.Prefix.GetAddressBytes();
-            if (BitConverter.IsLittleEndian)
-            {
-                addressBytes.Reverse();
-            }
-
-            uint iPAddress = BitConverter.ToUInt32(addressBytes, 0);
-            uint ipMaskV4 = BitConverter.ToUInt32(CidrToMask(network.PrefixLength, AddressFamily.InterNetwork).GetAddressBytes(), 0);
-            uint broadCastIPAddress = iPAddress | ~ipMaskV4;
-
-            return new IPAddress(BitConverter.GetBytes(broadCastIPAddress));
-        }
-    }
-}

tests/Jellyfin.Networking.Tests/NetworkExtensionsTests.cs

@@ -1,6 +1,6 @@
 using FsCheck;
 using FsCheck.Xunit;
-using MediaBrowser.Common.Net;
+using Jellyfin.Networking.Extensions;
 using Xunit;
 
 namespace Jellyfin.Networking.Tests

tests/Jellyfin.Networking.Tests/NetworkParseTests.cs

@@ -3,9 +3,9 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using Jellyfin.Networking.Configuration;
+using Jellyfin.Networking.Extensions;
 using Jellyfin.Networking.Manager;
 using MediaBrowser.Common.Configuration;
-using MediaBrowser.Common.Net;
 using MediaBrowser.Model.Net;
 using Microsoft.Extensions.Logging.Abstractions;
 using Moq;