91 lines
2.8 KiB
C#
91 lines
2.8 KiB
C#
/*
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This file is part of PacketDotNet
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PacketDotNet is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PacketDotNet is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PacketDotNet. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.Net;
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namespace PacketDotNet.Utils
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{
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/// <summary>
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/// Random utility methods
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/// </summary>
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public class RandomUtils
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{
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/// <summary>
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/// Generate a random ip address
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/// </summary>
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/// <param name="version">
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/// A <see cref="IpVersion"/>
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/// </param>
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/// <returns>
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/// A <see cref="System.Net.IPAddress"/>
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/// </returns>
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public static System.Net.IPAddress GetIPAddress(IpVersion version)
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{
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var rnd = new Random();
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byte[] randomAddressBytes;
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if(version == IpVersion.IPv4)
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{
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randomAddressBytes = new byte[IPv4Fields.AddressLength];
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rnd.NextBytes(randomAddressBytes);
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} else if(version == IpVersion.IPv6)
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{
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randomAddressBytes = new byte[IPv6Fields.AddressLength];
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rnd.NextBytes(randomAddressBytes);
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} else
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{
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throw new System.InvalidOperationException("Unknown version of " + version);
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}
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return new System.Net.IPAddress(randomAddressBytes);
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}
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/// <summary>
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/// Get the length of the longest string in a list of strings
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/// </summary>
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/// <param name="stringsList">
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/// A <see cref="List<System.String>"/>
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/// </param>
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/// <returns>
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/// A <see cref="System.Int32"/>
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/// </returns>
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public static int LongestStringLength(List<string> stringsList)
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{
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string longest="";
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foreach(string L in stringsList)
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{
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if (L.Length > longest.Length)
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{
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longest = L;
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}
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}
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return longest.Length;
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}
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public static void EnsurePacketLength(Packet packet, int minimalLength, int actualLength)
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{
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if(actualLength < minimalLength)
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{
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throw new PacketConstraintException(packet.GetType().Name, minimalLength, actualLength);
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}
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}
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}
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}
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