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);
}
private SocketError BindSocketByAddress(IntPtr socket, ISocketAddress socketAddress)
{
switch (socketAddress?.AddressFamily)
{
case AddressFamily.InterNetwork:
if (socketAddress.Address?.IPAddress?.Equals(IPAddress.Any) == true)
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [0.0.0.0]"
);
return(SocketError.Success);
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("127.0.0.0"),
IPAddress.Parse("127.255.255.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Loop Back]"
);
return(SocketError.Success); // LoopBack
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("10.0.0.0"),
IPAddress.Parse("10.255.255.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Private Range]"
);
return(SocketError.Success); // Private Network
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("172.16.0.0"),
IPAddress.Parse("172.31.255.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Private Range]"
);
return(SocketError.Success); // Private Network
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("192.168.0.0"),
IPAddress.Parse("192.168.255.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Private Range]"
);
return(SocketError.Success); // Private Network
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("169.254.1.0"),
IPAddress.Parse("169.254.254.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Link Local Network]"
);
return(SocketError.Success); // Link Local Network
}
if (IsIpInRange(socketAddress.Address?.IPAddress, IPAddress.Parse("224.0.0.0"),
IPAddress.Parse("239.255.255.255")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [MultiCast Address]"
);
return(SocketError.Success); // MultiCast
}
break;
case AddressFamily.InterNetworkV6:
if (socketAddress.Address?.IPAddress?.Equals(IPAddress.IPv6Any) == true)
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [0000:]"
);
return(SocketError.Success);
}
if (socketAddress.Address?.IPAddress?.Equals(IPAddress.IPv6Loopback) == true)
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [Loop Back]"
);
return(SocketError.Success); // LoopBack
}
if (IsIpInRange(socketAddress.Address?.IPAddress,
IPAddress.Parse("fc00:0000:0000:0000:0000:0000:0000:0000"),
IPAddress.Parse("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")))
{
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due to the nature of passed IP Address. [fc00:]"
);
return(SocketError.Success); // Unique Local Addresses, Private networks, MultiCast
}
break;
default:
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due an unsupported address family of `{0}`.",
socketAddress?.AddressFamily
);
return(SocketError.Success);
}
var networkInterface = GetNetworkInterface();
var interfaceAddress = GetInterfaceAddress(networkInterface, socketAddress.AddressFamily, false);
if (networkInterface == null || interfaceAddress == null)
{
DebugMessage(
nameof(OnBind),
"Binding for the `{0}:{1}` rejected due to lack of a valid interface address.",
socketAddress.Address?.IPAddress,
socketAddress.Port
);
return(SocketError.SocketError);
}
if (interfaceAddress.AddressFamily == AddressFamily.InterNetwork)
{
var bindIn = new SocketAddressIn
{
Address = new AddressIn {
IPAddress = interfaceAddress
},
AddressFamily = interfaceAddress.AddressFamily,
Port = 0 // Assign a random port
};
DebugMessage(
nameof(BindSocketByAddress),
"Binding to `{0}:{1}` ...",
bindIn.Address?.IPAddress,
bindIn.Port
);
return(Socket.Bind(socket, ref bindIn, Marshal.SizeOf(bindIn)));
}
if (interfaceAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
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 = 0, // Assign a random port
ScopeId = scopeId,
FlowInfo = flowInfo
};
DebugMessage(
nameof(BindSocketByAddress),
"Binding to `{0}:{1}` ...",
bindIn6.Address?.IPAddress,
bindIn6.Port
);
return(Socket.Bind(socket, ref bindIn6, Marshal.SizeOf(bindIn6)));
}
DebugMessage(
nameof(BindSocketByAddress),
"Binding to interface skipped due an unsupported interface address family of `{0}`.",
interfaceAddress.AddressFamily
);
return(SocketError.Success);
}