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namespace System.Net.PeerToPeer
{
using System;
using System.Net;
using System.Net.Sockets;
using System.Collections.Generic;
using System.Text;
using System.Security.Permissions;
internal static class SystemNetHelpers
{
internal const int IPv6AddressSize = 28;
internal const int IPv4AddressSize = 16;
internal static byte[] SOCKADDRFromIPEndPoint(IPEndPoint ipEndPoint)
{
byte[] buffer = new byte[ipEndPoint.AddressFamily == AddressFamily.InterNetworkV6 ? IPv6AddressSize : IPv4AddressSize];
#if BIGENDIAN
buffer[0] = unchecked((byte)((int)family>>8));
buffer[1] = unchecked((byte)((int)family ));
#else
buffer[0] = unchecked((byte)((int)ipEndPoint.AddressFamily));
buffer[1] = unchecked((byte)((int)ipEndPoint.AddressFamily >> 8));
#endif
if (ipEndPoint.AddressFamily == AddressFamily.InterNetworkV6)
{
buffer[2] = (byte)(ipEndPoint.Port >> 8);
buffer[3] = (byte)ipEndPoint.Port;
buffer[4] = (byte)0;
buffer[5] = (byte)0;
buffer[6] = (byte)0;
buffer[7] = (byte)0;
long scope = ipEndPoint.Address.ScopeId;
buffer[24] = (byte)scope;
buffer[25] = (byte)(scope >> 8);
buffer[26] = (byte)(scope >> 16);
buffer[27] = (byte)(scope >> 24);
byte[] addressBytes = ipEndPoint.Address.GetAddressBytes();
for (int i = 0; i < addressBytes.Length; i++)
{
buffer[8 + i] = addressBytes[i];
}
}
else
{
buffer[2] = unchecked((byte)(ipEndPoint.Port >> 8));
buffer[3] = unchecked((byte)(ipEndPoint.Port));
byte[] addressBytes = ipEndPoint.Address.GetAddressBytes();
for (int i = 0; i < addressBytes.Length; i++)
{
buffer[4 + i] = addressBytes[i];
}
}
return buffer;
}
internal static IPEndPoint IPEndPointFromSOCKADDRBuffer(byte[] buffer)
{
IPAddress ip = null;
int addressFamily = 0;
#if BIGENDIAN
addressFamily = buffer[1] + ((int)buffer[0] << 8);
#else
addressFamily = buffer[0] + ((int)buffer[1] << 8);
#endif
//Get port
int port = buffer[3] + ((int)buffer[2] << 8);
if ((AddressFamily)addressFamily == AddressFamily.InterNetwork)
{
byte[] v4bytes = new byte[] { buffer[4], buffer[5], buffer[6], buffer[7] };
ip = new IPAddress(v4bytes);
}
else if ((AddressFamily)addressFamily == AddressFamily.InterNetworkV6)
{
byte[] v6Bytes = new byte[16];
for (int i = 0; i < 16; i++)
v6Bytes[i] = buffer[8 + i];
long scope = ((long)(long)buffer[24] + ((long)buffer[25] << 8) + ((long)buffer[26] << 16) + ((long)buffer[27] << 24));
ip = new IPAddress(v6Bytes);
ip.ScopeId = scope;
}
return new IPEndPoint(ip, port);
}
}
}
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