106 lines
3.7 KiB
C#
106 lines
3.7 KiB
C#
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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namespace AMWD.Common.Utilities
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{
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/// <summary>
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/// Provides some network utils.
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/// </summary>
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public static class NetworkHelper
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{
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/// <summary>
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/// Tries to resolve a <paramref name="hostname"/> to its <see cref="IPAddress"/>es.
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/// </summary>
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/// <param name="hostname">The hostname to resolve.</param>
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/// <param name="addressFamily">An address family to use (available: <see cref="AddressFamily.InterNetwork"/> and <see cref="AddressFamily.InterNetworkV6"/>).</param>
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/// <returns>The resolved <see cref="IPAddress"/>es or an empty list.</returns>
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public static List<IPAddress> ResolveHost(string hostname, AddressFamily addressFamily = default)
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{
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if (string.IsNullOrWhiteSpace(hostname))
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return new();
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if (addressFamily != AddressFamily.InterNetwork && addressFamily != AddressFamily.InterNetworkV6)
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addressFamily = AddressFamily.Unspecified;
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var ipAddress = ResolveIpAddress(hostname, addressFamily);
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// the name was an ip address, should not happen but experience tells other stories
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if (ipAddress != null)
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return new() { ipAddress };
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try
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{
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return Dns.GetHostAddresses(hostname)
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.FilterAddressFamily(addressFamily)
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.ToList();
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}
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catch
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{
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return new();
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}
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}
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/// <summary>
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/// Tries to resolve an interface name to its v4 and v6 <see cref="IPAddress"/>es.
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/// </summary>
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/// <param name="interfaceName">The interface name to resolve.</param>
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/// <param name="addressFamily">An address family to use (available: <see cref="AddressFamily.InterNetwork"/> and <see cref="AddressFamily.InterNetworkV6"/>).</param>
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/// <returns>The resolved <see cref="IPAddress"/>es or an empty list.</returns>
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public static List<IPAddress> ResolveInterface(string interfaceName, AddressFamily addressFamily = default)
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{
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if (string.IsNullOrWhiteSpace(interfaceName))
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return new();
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if (addressFamily != AddressFamily.InterNetwork && addressFamily != AddressFamily.InterNetworkV6)
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addressFamily = AddressFamily.Unspecified;
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var ipAddress = ResolveIpAddress(interfaceName, addressFamily);
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// the name was an ip address, should not happen but experience tells other stories
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if (ipAddress != null)
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return new() { ipAddress };
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try
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{
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return NetworkInterface.GetAllNetworkInterfaces()
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.Where(nic => nic.Name.Equals(interfaceName, StringComparison.OrdinalIgnoreCase))
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.SelectMany(nic => nic.GetIPProperties().UnicastAddresses.Select(uai => uai.Address))
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.FilterAddressFamily(addressFamily)
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.ToList();
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}
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catch
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{
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return new();
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}
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}
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private static IPAddress ResolveIpAddress(string address, AddressFamily addressFamily)
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{
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if (IPAddress.TryParse(address, out var ipAddress))
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{
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// the address is whether IPv4 nor IPv6
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if (ipAddress.AddressFamily != AddressFamily.InterNetwork && ipAddress.AddressFamily != AddressFamily.InterNetworkV6)
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return null;
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// the address does not match the required address family
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if (addressFamily != AddressFamily.Unspecified && ipAddress.AddressFamily != addressFamily)
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return null;
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return ipAddress;
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}
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return null;
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}
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private static IEnumerable<IPAddress> FilterAddressFamily(this IEnumerable<IPAddress> source, AddressFamily addressFamily)
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{
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return source
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.Where(a => a.AddressFamily == AddressFamily.InterNetwork || a.AddressFamily == AddressFamily.InterNetworkV6)
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.Where(a => addressFamily == AddressFamily.Unspecified || a.AddressFamily == addressFamily)
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.OrderBy(a => a.AddressFamily);
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}
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}
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}
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