Yuebon.NetCore/Yuebon.Commons/Net/IPAddressRange.cs

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using System.Net;
using System.Text.RegularExpressions;

namespace Yuebon.Commons.Net
{
    /// <summary>
    /// IP v4 and v6 range helper by jsakamoto
    /// Fork from https://github.com/jsakamoto/ipaddressrange
    /// </summary>
    /// <example>
    /// "192.168.0.0/24" 
    /// "fe80::/10" 
    /// "192.168.0.0/255.255.255.0" 
    /// "192.168.0.0-192.168.0.255"
    /// </example>
    public class IpAddressRange
    {
        public IPAddress Begin { get; set; }

        public IPAddress End { get; set; }

        public IpAddressRange()
        {
            this.Begin = new IPAddress(0L);
            this.End = new IPAddress(0L);
        }

        public IpAddressRange(string ipRangeString)
        {
            // remove all spaces.
            ipRangeString = ipRangeString.Replace(" ", "");

            // Pattern 1. CIDR range: "192.168.0.0/24", "fe80::/10"
            var m1 = Regex.Match(ipRangeString, @"^(?<adr>[\da-f\.:]+)/(?<maskLen>\d+)$", RegexOptions.IgnoreCase);
            if (m1.Success)
            {
                var baseAdrBytes = IPAddress.Parse(m1.Groups["adr"].Value).GetAddressBytes();
                var maskBytes = Bits.GetBitMask(baseAdrBytes.Length, int.Parse(m1.Groups["maskLen"].Value));
                baseAdrBytes = Bits.And(baseAdrBytes, maskBytes);
                this.Begin = new IPAddress(baseAdrBytes);
                this.End = new IPAddress(Bits.Or(baseAdrBytes, Bits.Not(maskBytes)));
                return;
            }

            // Pattern 2. Uni address: "127.0.0.1", ":;1"
            var m2 = Regex.Match(ipRangeString, @"^(?<adr>[\da-f\.:]+)$", RegexOptions.IgnoreCase);
            if (m2.Success)
            {
                this.Begin = this.End = IPAddress.Parse(ipRangeString);
                return;
            }

            // Pattern 3. Begin end range: "169.258.0.0-169.258.0.255"
            var m3 = Regex.Match(ipRangeString, @"^(?<begin>[\da-f\.:]+)-(?<end>[\da-f\.:]+)$", RegexOptions.IgnoreCase);
            if (m3.Success)
            {
                this.Begin = IPAddress.Parse(m3.Groups["begin"].Value);
                this.End = IPAddress.Parse(m3.Groups["end"].Value);
                return;
            }