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udp_genesis             1 ------------------------------------------------------------------------------
udp_genesis             2 ------------------------------------------------------------------------------
udp_genesis             3 -- This file is part of 'UDP', a datagram sockets library.                  --
udp_genesis             4 --                                                                          --
udp_genesis             5 -- (C) 2018 Stanislav Datskovskiy ( www.loper-os.org )                      --
udp_genesis             6 -- http://wot.deedbot.org/17215D118B7239507FAFED98B98228A001ABFFC7.html     --
udp_genesis             7 --                                                                          --
udp_genesis             8 -- You do not have, nor can you ever acquire the right to use, copy or      --
udp_genesis             9 -- distribute this software ; Should you use this software for any purpose, --
udp_genesis            10 -- or copy and distribute it to anyone or in any manner, you are breaking   --
udp_genesis            11 -- the laws of whatever soi-disant jurisdiction, and you promise to         --
udp_genesis            12 -- continue doing so for the indefinite future. In any case, please         --
udp_genesis            13 -- always : read and understand any software ; verify any PGP signatures    --
udp_genesis            14 -- that you use - for any purpose.                                          --
udp_genesis            15 --                                                                          --
udp_genesis            16 -- See also http://trilema.com/2015/a-new-software-licensing-paradigm .     --
udp_genesis            17 ------------------------------------------------------------------------------
udp_genesis            18 ------------------------------------------------------------------------------
udp_genesis            19 
udp_genesis            20 with Interfaces, Interfaces.C; use Interfaces, Interfaces.C;
udp_genesis            21 with System; use System;
udp_genesis            22 
udp_genesis            23 
udp_genesis            24 package UDP is
udp_genesis            25    
udp_genesis            26    pragma Preelaborate;
udp_genesis            27    
udp_genesis            28    -- This is subject to debate:
udp_genesis            29    Payload_Size : constant Positive := 512;
udp_genesis            30    
udp_genesis            31    type Payload is array(1 .. Payload_Size) of Unsigned_8;
udp_genesis            32    
udp_genesis            33    --  type IP_Address is array(1 .. 4) of Unsigned_8;
udp_genesis            34    subtype IP_Address is Unsigned_32;
udp_genesis            35    subtype IP_Port is Unsigned_16;
udp_genesis            36    
udp_genesis            37    -- Magic that puts emitter on 'any' local interface
udp_genesis            38    INADDR_ANY : constant Unsigned_32 := 0;
udp_genesis            39    
udp_genesis            40    -- An local or remote address:port
udp_genesis            41    type Endpoint is
udp_genesis            42       record
udp_genesis            43          Address : IP_Address;
udp_genesis            44          Port    : IP_Port;
udp_genesis            45       end record;
udp_genesis            46    -- NOTE that both elements are stored in ~local~ endianness.
udp_genesis            47    
udp_genesis            48    -- Human Representation of any valid IP Address
udp_genesis            49    subtype IP_Address_Text is String(1 .. 15);
udp_genesis            50    
udp_genesis            51    -- Opaque unix turd that stores a socket's state
udp_genesis            52    type Socket is private;
udp_genesis            53    
udp_genesis            54    -- The public API:
udp_genesis            55    
udp_genesis            56    -- Generate a human representation of a (local-endian) IP Address
udp_genesis            57    function IP_To_String(IP : in IP_Address) return IP_Address_Text;
udp_genesis            58    
udp_genesis            59    -- Generate a (local-endian) IP Address from given human representation
udp_genesis            60    function IP_From_String(IP_Text : in String) return IP_Address;
udp_genesis            61    
udp_genesis            62    -- Open a UDP socket, with the given local endpoint for both TX and RX
udp_genesis            63    procedure Open_Socket(S              : out    Socket;
udp_genesis            64                          Local_Endpoint : in     Endpoint);
udp_genesis            65    
udp_genesis            66    -- Permanently close the given open given socket
udp_genesis            67    procedure Close_Socket(S             : in out Socket);
udp_genesis            68    
udp_genesis            69    -- Transmit the Payload, via Socket, to given Destination
udp_genesis            70    procedure Transmit(S           : in out Socket;
udp_genesis            71                       Destination : in     Endpoint;
udp_genesis            72                       Payload_Buf : in     Payload);
udp_genesis            73    
udp_genesis            74    -- Wait (potentially forever!) for a Payload, via Socket; save its Origin,
udp_genesis            75    -- and whether the received Payload was valid (i.e. expected length):
udp_genesis            76    procedure Receive(S           : in out Socket;
udp_genesis            77                      Origin      : out    Endpoint;
udp_genesis            78                      Payload_Buf : out    Payload;
udp_genesis            79                      Valid       : out    Boolean);
udp_genesis            80    
udp_genesis            81    -- Eggogology:
udp_genesis            82    UDP_Invalid_Text_IP : exception;
udp_genesis            83    UDP_Failed_Open     : exception;
udp_genesis            84    UDP_Failed_SetOpt   : exception;
udp_genesis            85    UDP_Failed_Bind     : exception;
udp_genesis            86    UDP_Failed_Transmit : exception;
udp_genesis            87    UDP_Failed_Receive  : exception;
udp_genesis            88    
udp_genesis            89 private
udp_genesis            90    
udp_genesis            91    -- 'nicht fuer gefingerpoken und mittengrabben!'
udp_genesis            92    
udp_genesis            93    -- This record's elements are not accessed from ada:
udp_genesis            94    type sockaddr_in is record
udp_genesis            95       family   : Unsigned_16;
udp_genesis            96       port     : Unsigned_16;
udp_genesis            97       sin_addr : Unsigned_32;
udp_genesis            98       padding  : Unsigned_64;
udp_genesis            99    end record;
udp_genesis           100    pragma Convention(C, sockaddr_in);
udp_genesis           101    
udp_genesis           102    -- Here we also don't care about the elements, only total mass:
udp_genesis           103    type Socket is
udp_genesis           104       record
udp_genesis           105          SA : sockaddr_in;
udp_genesis           106          FD : Interfaces.C.int;
udp_genesis           107       end record;
udp_genesis           108    pragma Convention(C, Socket);
udp_genesis           109    
udp_genesis           110    -- Everything below -- imports from unix_udp.c:
udp_genesis           111    
udp_genesis           112    procedure Unix_UDP_IP_To_String
udp_genesis           113      (IP                 : Unsigned_32;
udp_genesis           114       Output_Buffer      : System.Address;
udp_genesis           115       Output_Buffer_Size : Unsigned_32);
udp_genesis           116    pragma Import(C, Unix_UDP_IP_To_String, "unix_udp_ip_to_string");
udp_genesis           117    
udp_genesis           118    function Unix_UDP_String_To_IP
udp_genesis           119      (Input_Buffer : System.Address;
udp_genesis           120       IP           : not null access Unsigned_32) return Interfaces.C.int;
udp_genesis           121    pragma Import(C, Unix_UDP_String_To_IP, "unix_udp_string_to_ip");
udp_genesis           122    
udp_genesis           123    function Unix_UDP_Socket_Open
udp_genesis           124      (Socket     : System.Address;
udp_genesis           125       Local_IP   : Unsigned_32;
udp_genesis           126       Local_Port : Unsigned_16) return Interfaces.C.int;
udp_genesis           127    pragma Import(C, Unix_UDP_Socket_Open, "unix_udp_socket_open");
udp_genesis           128    
udp_genesis           129    procedure Unix_UDP_Socket_Close
udp_genesis           130      (Socket     : System.Address);
udp_genesis           131    pragma Import(C, Unix_UDP_Socket_Close, "unix_udp_socket_close");
udp_genesis           132    
udp_genesis           133    function Unix_UDP_Socket_Transmit
udp_genesis           134      (Socket      : System.Address;
udp_genesis           135       Remote_IP   : Unsigned_32;
udp_genesis           136       Remote_Port : Unsigned_16;
udp_genesis           137       Payload_Buf : System.Address;
udp_genesis           138       Payload_Len : Unsigned_32) return Interfaces.C.int;
udp_genesis           139    pragma Import(C, Unix_UDP_Socket_Transmit, "unix_udp_socket_transmit");
udp_genesis           140    
udp_genesis           141    function Unix_UDP_Socket_Receive
udp_genesis           142      (Socket      : System.Address;
udp_genesis           143       Origin_IP   : not null access Unsigned_32;
udp_genesis           144       Origin_Port : not null access Unsigned_16;
udp_genesis           145       Payload_Buf : System.Address;
udp_genesis           146       Payload_Len : Unsigned_32) return Interfaces.C.int;
udp_genesis           147    pragma Import(C, Unix_UDP_Socket_Receive, "unix_udp_socket_receive");
udp_genesis           148    
udp_genesis           149 end UDP;