private void DebugMessage(string scope, string message, params object[] args)
{
var lastError = Socket.WSAGetLastError();
try
{
if (string.IsNullOrWhiteSpace(LogPath))
{
return;
}
var space = Math.Max(15 - scope.Length, 0);
message = string.Format(
"{0:s} - [`{1}`] : {2}{3}",
DateTime.UtcNow,
scope,
new string(' ', space),
args?.Length > 0 ? string.Format(message, args) : message
);
Debug.WriteLine(message);
File.AppendAllText(LogPath, message + Environment.NewLine);
}
catch
{
// ignored
}
Socket.WSASetLastError(lastError);
}
private SocketError OnConnect(IntPtr socket, IntPtr address, int addressSize)
{
var socketAddress = GetSocketAddress(address);
DebugMessage(
nameof(OnConnect),
"Connecting to `{0}:{1}` ...",
socketAddress?.Address?.IPAddress,
socketAddress?.Port
);
var bindResult = BindSocketByAddress(socket, socketAddress);
DebugMessage(
nameof(OnConnect),
"Binding `{0}:{1}` to interface resulted in a `{2}` response. [WSALastError = `{3}`]",
socketAddress?.Address?.IPAddress,
socketAddress?.Port,
bindResult,
Socket.WSAGetLastError()
);
if (bindResult != SocketError.Success)
{
if (bindResult != SocketError.SocketError)
{
DebugMessage(nameof(OnConnect), Socket.WSAGetLastError().ToString());
}
DebugMessage(
nameof(OnConnect),
"Connecting to `{0}:{1}` rejected.",
socketAddress?.Address?.IPAddress,
socketAddress?.Port
);
return(SocketError.SocketError);
}
var returnValue = Socket.Connect(socket, address, addressSize);
DebugMessage(
nameof(OnConnect),
"Connecting to `{0}:{1}` resulted in a `{2}` response. [WSALastError = `{3}`]",
socketAddress?.Address?.IPAddress,
socketAddress?.Port,
returnValue,
Socket.WSAGetLastError()
);
//if (returnValue == SocketError.SocketError && Socket.WSAGetLastError() == SocketError.Success)
//{
// returnValue = SocketError.Success;
//}
return(returnValue);
}
private SocketError OnBind(IntPtr socket, IntPtr address, int addressSize)
{
var socketAddress = GetSocketAddress(address);
DebugMessage(
nameof(OnBind),
"Binding to `{0}:{1}` ...",
socketAddress?.Address?.IPAddress,
socketAddress?.Port
);
var networkInterface = GetNetworkInterface();
var interfaceAddress = GetInterfaceAddress(networkInterface, socketAddress?.AddressFamily, true);
if (socketAddress?.Address == null || networkInterface == null || interfaceAddress == null)
{
DebugMessage(
nameof(OnBind),
"Binding to `{0}:{1}` rejected due to lack of a valid interface address.",
socketAddress?.Address?.IPAddress,
socketAddress?.Port
);
return(SocketError.SocketError);
}
SocketError bindResult;
if (interfaceAddress.AddressFamily == AddressFamily.InterNetwork &&
!interfaceAddress.Equals(socketAddress.Address.IPAddress))
{
var bindIn = new SocketAddressIn
{
Address = new AddressIn {
IPAddress = interfaceAddress
},
AddressFamily = interfaceAddress.AddressFamily,
Port = socketAddress.Port
};
DebugMessage(
nameof(OnBind),
"Binding to `{0}:{1}` replaced by a binding request to `{2}:{3}`.",
socketAddress.Address.IPAddress,
socketAddress.Port,
bindIn.Address.IPAddress,
bindIn.Port
);
socketAddress = bindIn;
bindResult = Socket.Bind(socket, ref bindIn, Marshal.SizeOf(bindIn));
}
else if (interfaceAddress.AddressFamily == AddressFamily.InterNetworkV6 &&
!interfaceAddress.Equals(socketAddress.Address.IPAddress))
{
var scopeId = (uint?)networkInterface.GetIPProperties()?.GetIPv6Properties()?.Index ?? 0;
var flowInfo = (socketAddress as SocketAddressIn6?)?.FlowInfo ?? 0;
var bindIn6 = new SocketAddressIn6
{
Address = new AddressIn6 {
IPAddress = interfaceAddress
},
AddressFamily = interfaceAddress.AddressFamily,
Port = socketAddress.Port, // Assign a random port
ScopeId = scopeId,
FlowInfo = flowInfo
};
DebugMessage(
nameof(OnBind),
"Binding to `{0}:{1}` replaced by a binding request to `{2}:{3}`.",
socketAddress.Address.IPAddress,
socketAddress.Port,
bindIn6.Address.IPAddress,
bindIn6.Port
);
socketAddress = bindIn6;
bindResult = Socket.Bind(socket, ref bindIn6, Marshal.SizeOf(bindIn6));
}
else
{
bindResult = Socket.Bind(socket, address, addressSize);
}
DebugMessage(
nameof(OnBind),
"Binding to `{0}:{1}` resulted in a `{2}` response. [WSALastError = `{3}`]",
socketAddress.Address.IPAddress,
socketAddress.Port,
bindResult,
Socket.WSAGetLastError()
);
return(bindResult);
}