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GitHub release

This is a highly portable, lightweight and straightforward, zero-cost abstraction of UDP sockets with dual-stack IPv4/IPv6 support for rapid implementation of message-oriented protocols. The library is designed for cross-language compatibility with C, C++, C#, and other languages. For .NET environment, functions support blittable pointers as an alternative to managed types for usage with unmanaged memory allocator.

Building

The native library can be built using CMake with GNU Make or Visual Studio.

A managed assembly can be built using any available compiling platform that supports C# 4.0 or higher.

Compiled libraries

You can grab compiled libraries from the release section.

Binaries are provided only for traditional platforms: Windows, Linux, and macOS (x64).

Supported OS versions:

Usage

Before starting to work, the library should be initialized using NanoSockets.UDP.Initialize(); function.

After the work is done, deinitialize the library using NanoSockets.UDP.Deinitialize(); function.

.NET environment

Start a new server
Socket server = UDP.Create(256 * 1024, 256 * 1024);
Address listenAddress = new Address();

listenAddress.port = port;

if (UDP.SetIP(ref listenAddress, "::0") == Status.OK)
    Console.WriteLine("Address set!");

if (UDP.Bind(server, ref listenAddress) == 0)
    Console.WriteLine("Socket bound!");

if (UDP.SetDontFragment(server) != Status.OK)
    Console.WriteLine("Don't fragment option error!");

if (UDP.SetNonBlocking(server) != Status.OK)
    Console.WriteLine("Non-blocking option error!");

StringBuilder ip = new StringBuilder(UDP.hostNameSize);
Address address = new Address();
byte[] buffer = new byte[1024];

while (!Console.KeyAvailable) {
    if (UDP.Poll(server, 15) > 0) {
        int dataLength = 0;

        while ((dataLength = UDP.Receive(server, ref address, buffer, buffer.Length)) > 0) {
            UDP.GetIP(ref address, ip, ip.Capacity);

            Console.WriteLine("Message received from - IP: " + ip + ", Data length: " + dataLength);

            UDP.Send(server, ref address, buffer, buffer.Length);
        }
    }
}

UDP.Destroy(ref server);
Start a new client
Socket client = UDP.Create(256 * 1024, 256 * 1024);
Address connectionAddress = new Address();

connectionAddress.port = port;

if (UDP.SetIP(ref connectionAddress, "::1") == Status.OK)
    Console.WriteLine("Address set!");

if (UDP.Connect(client, ref connectionAddress) == 0)
    Console.WriteLine("Socket connected!");

if (UDP.SetDontFragment(client) != Status.OK)
    Console.WriteLine("Don't fragment option error!");

if (UDP.SetNonBlocking(client) != Status.OK)
    Console.WriteLine("Non-blocking option error!");

byte[] buffer = new byte[1024];

UDP.Send(client, IntPtr.Zero, buffer, buffer.Length);

while (!Console.KeyAvailable) {
    if (UDP.Poll(client, 15) > 0) {
        int dataLength = 0;

        while ((dataLength = UDP.Receive(client, IntPtr.Zero, buffer, buffer.Length)) > 0) {
            Console.WriteLine("Message received from server - Data length: " + dataLength);

            UDP.Send(client, IntPtr.Zero, buffer, buffer.Length);
        }
    }
}

UDP.Destroy(ref client);

Unity

Usage is almost the same as in the .NET environment, except that the console functions must be replaced with functions provided by Unity. If the UDP.Poll() will be called in a game loop, then make sure that the timeout parameter set to 0 which means non-blocking. Also, keep Unity run in background by enabling the appropriate option in the player settings.

API reference

Enumerations

Status

Definitions of status types for functions:

OK

Error

Structures

Socket

Contains a blittable structure with socket handle.

Socket.handle a socket handle.

Socket.IsCreated checks if a socket is created.

Address

Contains a blittable structure with anonymous host data and port number.

Address.port a port number.

Classes

UDP

UDP.Initialize() initializes the native library. Should be called before starting the work. Returns status with a result.

UDP.Deinitialize() deinitializes the native library. Should be called after the work is done.

UDP.Create(int sendBufferSize, int receiveBufferSize) creates a new socket with a specified size of buffers for sending and receiving. Returns the Socket structure with the handle.

UDP.Destroy(ref Socket socket) destroys a socket and reset the handle.

UDP.Bind(Socket socket, ref Address address) assigns an address to a socket. The address parameter can be set to IntPtr.Zero to let the operating system assign any address. Returns 0 on success or != 0 on failure.

UDP.Connect(Socket socket, ref Address address) connects a socket to an address. Returns 0 on success or != 0 on failure.

UDP.SetOption(Socket socket, int level, int optionName, ref int optionValue, int optionLength) sets the current value for a socket option associated with a socket. This function can be used to set platform-specific options that were not specified at socket creation by default. Returns status with a result.

UDP.GetOption(Socket socket, int level, int optionName, ref int optionValue, ref int optionLength) gets the current value for a socket option associated with a socket. A length of an option value should be initially set to an appropriate size. Returns status with a result.

UDP.SetNonBlocking(Socket socket, bool shouldBlock) sets a non-blocking I/O mode for a socket. Returns status with a result.

UDP.SetDontFragment(Socket socket) sets a don't fragment mode for a socket. Returns status with a result.

UDP.Poll(Socket socket, long timeout) determines the status of a socket and waiting if necessary. This function can be used for readiness-oriented receiving. The timeout parameter may be specified in milliseconds to control polling duration. If a timeout of 0 is specified, this function will return immediately. If the time limit expired it will return 0. If a socket is ready for receiving it will return 1. Otherwise, it will return < 0 if an error occurred.

UDP.Send(Socket socket, ref Address address, byte[] buffer, int bufferLength) sends a message to the specified address of a receiver. The address parameter can be set to IntPtr.Zero if a socket is connected to an address. A pointer IntPtr to a native buffer can be used instead of a reference to a byte array. Returns the total number of bytes sent, which can be less than the number indicated by the buffer length. Otherwise, it will return < 0 if an error occurred.

UDP.Receive(Socket socket, ref Address address, byte[] buffer, int bufferLength) receives a message and obtains the address of a sender. The address parameter can be set to IntPtr.Zero to skip the address obtainment. A pointer IntPtr to a native buffer can be used instead of a reference to a byte array. Returns the total number of bytes received. Otherwise, it will return < 0 if an error occurred.

UDP.GetAddress(Socket socket, ref Address address) gets an address from a bound or connected socket. This function is especially useful to determine the local association that has been set by the operating system. Returns status with a result.

UDP.IsEqual(ref Address left, ref Address right) compares two addresses for equality. Returns status with a result.

UDP.SetIP(ref Address address, string ip) sets an IP address. A pointer IntPtr can be used instead of the immutable string. Returns status with a result.

UDP.GetIP(ref Address address, StringBuilder ip, int ipLength) gets an IP address. The capacity of the mutable string should be equal to UDP.hostNameSize constant field. A pointer IntPtr can be used instead of the mutable string. Returns status with a result.

UDP.SetHostName(ref Address address, string name) sets host name or an IP address. A pointer IntPtr can be used instead of the immutable string. Returns status with a result.

UDP.GetHostName(ref Address address, StringBuilder name, int nameLength) attempts to do a reverse lookup from the address. A pointer IntPtr can be used instead of the mutable string. Returns status with a result.