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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](https://cmake.org/download/) with GNU Make or Visual Studio. A managed assembly can be built using any available compiling platform that supports C# 3.0 or higher. Compiled libraries -------- You can grab compiled libraries from the [release](https://github.com/nxrighthere/NanoSockets/releases) section. Binaries are provided only for traditional platforms: Windows, Linux, and macOS (x64). Supported OS versions: - Windows 7 or higher - Linux 4.4 or higher - macOS 10.12 or higher 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: ```c# 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: ```c# 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)` 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.