272 lines
9.8 KiB
C#
272 lines
9.8 KiB
C#
using Microsoft.AspNetCore.HttpOverrides;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Net;
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using System.Net.Sockets;
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using System.Text.RegularExpressions;
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namespace MediaBrowser.Common.Net
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{
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/// <summary>
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/// Defines the <see cref="NetworkExtensions" />.
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/// </summary>
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public static class NetworkExtensions
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{
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// Use regular expression as CheckHostName isn't RFC5892 compliant.
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// Modified from gSkinner's expression at https://stackoverflow.com/questions/11809631/fully-qualified-domain-name-validation
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private static readonly Regex _fqdnRegex = new Regex(@"(?im)^(?!:\/\/)(?=.{1,255}$)((.{1,63}\.){0,127}(?![0-9]*$)[a-z0-9-]+\.?)(:(\d){1,5}){0,1}$");
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/// <summary>
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/// Returns true if the IPAddress contains an IP6 Local link address.
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/// </summary>
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/// <param name="address">IPAddress object to check.</param>
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/// <returns>True if it is a local link address.</returns>
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/// <remarks>
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/// See https://stackoverflow.com/questions/6459928/explain-the-instance-properties-of-system-net-ipaddress
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/// it appears that the IPAddress.IsIPv6LinkLocal is out of date.
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/// </remarks>
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public static bool IsIPv6LinkLocal(IPAddress address)
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{
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ArgumentNullException.ThrowIfNull(address);
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if (address.IsIPv4MappedToIPv6)
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{
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address = address.MapToIPv4();
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}
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if (address.AddressFamily != AddressFamily.InterNetworkV6)
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{
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return false;
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}
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// GetAddressBytes
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Span<byte> octet = stackalloc byte[16];
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address.TryWriteBytes(octet, out _);
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uint word = (uint)(octet[0] << 8) + octet[1];
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return word >= 0xfe80 && word <= 0xfebf; // fe80::/10 :Local link.
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}
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/// <summary>
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/// Convert a subnet mask in CIDR notation to a dotted decimal string value. IPv4 only.
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/// </summary>
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/// <param name="cidr">Subnet mask in CIDR notation.</param>
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/// <param name="family">IPv4 or IPv6 family.</param>
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/// <returns>String value of the subnet mask in dotted decimal notation.</returns>
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public static IPAddress CidrToMask(byte cidr, AddressFamily family)
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{
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uint addr = 0xFFFFFFFF << (family == AddressFamily.InterNetwork ? 32 : 128 - cidr);
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addr = ((addr & 0xff000000) >> 24)
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| ((addr & 0x00ff0000) >> 8)
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| ((addr & 0x0000ff00) << 8)
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| ((addr & 0x000000ff) << 24);
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return new IPAddress(addr);
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}
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/// <summary>
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/// Convert a subnet mask to a CIDR. IPv4 only.
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/// https://stackoverflow.com/questions/36954345/get-cidr-from-netmask.
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/// </summary>
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/// <param name="mask">Subnet mask.</param>
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/// <returns>Byte CIDR representing the mask.</returns>
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public static byte MaskToCidr(IPAddress mask)
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{
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ArgumentNullException.ThrowIfNull(mask);
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byte cidrnet = 0;
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if (!mask.Equals(IPAddress.Any))
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{
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// GetAddressBytes
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Span<byte> bytes = stackalloc byte[mask.AddressFamily == AddressFamily.InterNetwork ? 4 : 16];
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mask.TryWriteBytes(bytes, out _);
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var zeroed = false;
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for (var i = 0; i < bytes.Length; i++)
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{
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for (int v = bytes[i]; (v & 0xFF) != 0; v <<= 1)
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{
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if (zeroed)
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{
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// Invalid netmask.
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return (byte)~cidrnet;
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}
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if ((v & 0x80) == 0)
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{
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zeroed = true;
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}
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else
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{
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cidrnet++;
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}
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}
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}
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}
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return cidrnet;
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}
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/// <summary>
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/// Converts an IPAddress into a string.
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/// Ipv6 addresses are returned in [ ], with their scope removed.
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/// </summary>
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/// <param name="address">Address to convert.</param>
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/// <returns>URI safe conversion of the address.</returns>
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public static string FormatIpString(IPAddress? address)
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{
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if (address == null)
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{
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return string.Empty;
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}
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var str = address.ToString();
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if (address.AddressFamily == AddressFamily.InterNetworkV6)
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{
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int i = str.IndexOf('%', StringComparison.Ordinal);
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if (i != -1)
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{
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str = str.Substring(0, i);
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}
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return $"[{str}]";
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}
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return str;
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}
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/// <summary>
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/// Try parsing an array of strings into subnets, respecting exclusions.
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/// </summary>
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/// <param name="values">Input string to be parsed.</param>
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/// <param name="result">Collection of <see cref="IPNetwork"/>.</param>
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/// <param name="negated">Boolean signaling if negated or not negated values should be parsed.</param>
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/// <returns><c>True</c> if parsing was successful.</returns>
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public static bool TryParseSubnets(string[] values, out List<IPNetwork> result, bool negated = false)
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{
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result = new List<IPNetwork>();
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if (values == null || values.Length == 0)
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{
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return false;
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}
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for (int a = 0; a < values.Length; a++)
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{
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string[] v = values[a].Trim().Split("/");
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var address = IPAddress.None;
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if (negated && v[0].StartsWith('!'))
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{
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_ = IPAddress.TryParse(v[0][1..], out address);
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}
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else if (!negated)
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{
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_ = IPAddress.TryParse(v[0][0..], out address);
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}
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if (address != IPAddress.None && address != null)
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{
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if (int.TryParse(v[1], out var netmask))
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{
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result.Add(new IPNetwork(address, netmask));
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}
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else if (address.AddressFamily == AddressFamily.InterNetwork)
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{
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result.Add(new IPNetwork(address, 32));
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}
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else if (address.AddressFamily == AddressFamily.InterNetworkV6)
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{
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result.Add(new IPNetwork(address, 128));
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}
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}
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}
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if (result.Count > 0)
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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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/// <summary>
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/// Attempts to parse a host string.
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/// </summary>
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/// <param name="host">Host name to parse.</param>
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/// <param name="addresses">Object representing the string, if it has successfully been parsed.</param>
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/// <param name="isIpv4Enabled"><c>true</c> if IPv4 is enabled.</param>
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/// <param name="isIpv6Enabled"><c>true</c> if IPv6 is enabled.</param>
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/// <returns><c>true</c> if the parsing is successful, <c>false</c> if not.</returns>
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public static bool TryParseHost(string host, [NotNullWhen(true)] out IPAddress[] addresses, bool isIpv4Enabled = true, bool isIpv6Enabled = false)
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{
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if (string.IsNullOrWhiteSpace(host))
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{
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addresses = Array.Empty<IPAddress>();
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return false;
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}
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host = host.Trim();
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// See if it's an IPv6 with port address e.g. [::1] or [::1]:120.
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if (host[0] == '[')
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{
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int i = host.IndexOf(']', StringComparison.Ordinal);
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if (i != -1)
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{
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return TryParseHost(host.Remove(i)[1..], out addresses);
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}
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addresses = Array.Empty<IPAddress>();
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return false;
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}
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var hosts = host.Split(':');
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if (hosts.Length <= 2)
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{
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// Is hostname or hostname:port
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if (_fqdnRegex.IsMatch(hosts[0]))
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{
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try
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{
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addresses = Dns.GetHostAddresses(hosts[0]);
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return true;
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}
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catch (SocketException)
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{
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// Log and then ignore socket errors, as the result value will just be an empty array.
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Console.WriteLine("GetHostAddresses failed.");
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}
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}
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// Is an IP4 or IP4:port
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host = hosts[0].Split('/')[0];
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if (IPAddress.TryParse(host, out var address))
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{
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if (((address.AddressFamily == AddressFamily.InterNetwork) && (!isIpv4Enabled && isIpv6Enabled)) ||
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((address.AddressFamily == AddressFamily.InterNetworkV6) && (isIpv4Enabled && !isIpv6Enabled)))
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{
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addresses = Array.Empty<IPAddress>();
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return false;
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}
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addresses = new[] { address };
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// Host name is an ip4 address, so fake resolve.
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return true;
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}
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}
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else if (hosts.Length <= 9 && IPAddress.TryParse(host.Split('/')[0], out var address)) // 8 octets + port
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{
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addresses = new[] { address };
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return true;
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}
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addresses = Array.Empty<IPAddress>();
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return false;
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}
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}
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}
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