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IPv6: Space Wizard Edition.

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This PR fixes the IPv6 support *properly*. The two previous PRs, #123 and #126, both made a mess out of it:

PR #123 implemented IPv6 by breaking non-dualstack IPv4 support.
PR #126 fixed IPv4 support by breaking non-dualstack IPv6 support.

This change fixes the mess entirely. IPv4, IPv6 and IPv6-dual-stack are now all independently supported and work as expected.
Namely IPv4 can't receive IPv6, IPv6 can only receive IPv4 if NetPeerConfiguration.DualStack is set. You can still have an IPv6-only socket.

I'll leave some review comments on the PR for less-immediately obvious changes.
This commit is contained in:
Pieter-Jan Briers
2020-02-15 00:09:21 +01:00
parent 78df229a1b
commit f0e5bb4515
4 changed files with 50 additions and 41 deletions
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17
Lidgren.Network/NetPeer.Internal.cs
View File

@@ -132,14 +132,19 @@ namespace Lidgren.Network
m_socket.SendBufferSize = m_configuration.SendBufferSize;
m_socket.Blocking = false;
if(m_configuration.DualStack && m_configuration.LocalAddress.AddressFamily == AddressFamily.InterNetworkV6)
if (m_configuration.DualStack)
{
if (m_configuration.LocalAddress.AddressFamily != AddressFamily.InterNetworkV6)
{
LogWarning("Configuration specifies Dual Stack but does not use IPv6 local address; Dual stack will not work.");
}
else
{
m_socket.DualMode = true;
}
}
var localAddress = m_configuration.DualStack
? m_configuration.LocalAddress.MapToIPv6()
: m_configuration.LocalAddress;
var ep = (EndPoint)new NetEndPoint(localAddress, reBind ? m_listenPort : m_configuration.Port);
var ep = (EndPoint)new NetEndPoint(m_configuration.LocalAddress, reBind ? m_listenPort : m_configuration.Port);
m_socket.Bind(ep);
try

12
Lidgren.Network/NetPeer.cs
View File

@@ -2,7 +2,7 @@
using System.Threading;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
#if !__NOIPENDPOINT__
using NetEndPoint = System.Net.IPEndPoint;
#endif
@@ -121,8 +121,14 @@ namespace Lidgren.Network
m_connections = new List<NetConnection>();
m_connectionLookup = new Dictionary<NetEndPoint, NetConnection>();
m_handshakes = new Dictionary<NetEndPoint, NetConnection>();
var address = config.DualStack ? IPAddress.IPv6Any : IPAddress.Any;
m_senderRemote = (EndPoint)new NetEndPoint(address, 0);
if (m_configuration.LocalAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
m_senderRemote = (EndPoint)new IPEndPoint(IPAddress.IPv6Any, 0);
}
else
{
m_senderRemote = (EndPoint)new IPEndPoint(IPAddress.Any, 0);
}
m_status = NetPeerStatus.NotRunning;
m_receivedFragmentGroups = new Dictionary<NetConnection, Dictionary<int, ReceivedFragmentGroup>>();
}

8
Lidgren.Network/NetPeerConfiguration.cs
View File

@@ -344,7 +344,9 @@ namespace Lidgren.Network
}
/// <summary>
/// Gets or sets a value indicating whether the library should use IPv6 dual stack mode
/// Gets or sets a value indicating whether the library should use IPv6 dual stack mode.
/// If you enable this you should make sure that the <see cref="LocalAddress"/> is an IPv6 address.
/// Cannot be changed once NetPeer is initialized.
/// </summary>
public bool DualStack
{
@@ -354,10 +356,6 @@ namespace Lidgren.Network
if (m_isLocked)
throw new NetException(c_isLockedMessage);
m_dualStack = value;
if (m_dualStack && m_localAddress.Equals(IPAddress.Any))
m_localAddress = IPAddress.IPv6Any;
if (!m_dualStack && m_localAddress.Equals(IPAddress.IPv6Any))
m_localAddress = IPAddress.Any;
}
}