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|
------------------------------------------------------------------------------
-- --
-- GNATSOCKS --
-- --
-- S o c k e t s --
-- --
-- B o d y --
-- --
-- --
-- Copyright (c) 1997-1998 Florida State University (FSU), --
-- All Rights Reserved. --
-- --
-- This file is a component of GNATSOCKS, an Ada interfaces to socket I/O --
-- services, for use with the GNAT Ada compiler. --
-- --
-- GNATSOCKS is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 2, or (at your option) any --
-- later version. FLORIST is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have received a --
-- copy of the GNU General Public License distributed with GNARL; see --
-- file COPYING. If not, write to the Free Software Foundation, 59 --
-- Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
------------------------------------------------------------------------------
-- [$Revision: 110555 $]
with Ada.Text_IO,
Ada.Streams,
POSIX,
POSIX.C,
POSIX.Implementation,
System,
Unchecked_Conversion;
package body Sockets is
use Ada.Text_IO,
POSIX,
POSIX.C,
POSIX.C.Sockets,
POSIX.Implementation;
function close (fildes : int) return int;
pragma Import (C, close, close_LINKNAME);
procedure Close (Sock : in out Socket'Class) is
begin
if Sock.fd /= 0 then Check (close (Sock.fd)); end if;
Sock.fd := 0;
end Close;
procedure Finalize (Sock : in out Socket) is
begin
Close (Sock);
end Finalize;
--------------------------------------
function connect
(socket_fd : int;
name : sockaddr_ptr;
namelen : int)
return int;
pragma Import (C, connect, connect_LINKNAME);
-- attempts to make a connection to a named socket.
function make_socket
(domain : int;
socket_type : int;
protocol : int)
return int;
pragma Import (C, make_socket, socket_LINKNAME);
procedure Open
(Sock : in out Stream_Socket;
Addr : Socket_Address'Class) is
begin
if not Valid (Addr) then raise Constraint_Error; end if;
if Sock.fd /= 0 then raise Constraint_Error; end if;
Sock.fd := Check (make_socket (PF_INET, SOCK_STREAM, 0));
Check (connect (Sock.fd, Address (Addr), Length (Addr)));
Sock.in_stream.sock := Sock'Unchecked_Access;
Sock.in_ptr := Sock.in_stream'Unchecked_Access;
Sock.out_stream.sock := Sock'Unchecked_Access;
Sock.out_ptr := Sock.out_stream'Unchecked_Access;
Sock.tag := Addr'Tag;
end Open;
function Get_Input_Stream (Sock : Stream_Socket) return Input_Stream_Ptr is
begin
if Sock.fd = 0 then raise Constraint_Error; end if;
return Sock.in_ptr;
end Get_Input_Stream;
function Get_Output_Stream (Sock : Stream_Socket) return Output_Stream_Ptr is
begin
if Sock.fd = 0 then raise Constraint_Error; end if;
return Sock.out_ptr;
end Get_Output_Stream;
-----------------------------------------
function listen
(socket_fd : int;
backlog : int)
return int;
pragma Import (C, listen, listen_LINKNAME);
-- specifies that we want to listen on the argument socket ID.
-- backlog is the number of backlogged connections that are allowed.
-- To accept connections, a socket is first crated with socked(),
-- a backlog for incoming connections is specified with listen(),
-- and then the connections are accepted with accept().
function bind
(socket_fd : int;
name : sockaddr_ptr;
namelen : int)
return int;
pragma Import (C, bind, bind_LINKNAME);
-- assigns a name to an unnamed socket.
-- A socket is first created with socket().
-- Binding a socket in the UNIX (not Internet) domain
-- causes creation of a socket in the file system, that must
-- be deleted later when it is no longer needed, using unlink()
procedure Open
(Sock : in out Server_Socket;
Addr : Socket_Address'Class;
Count : Natural := 0) is
begin
if not Valid (Addr) then raise Constraint_Error; end if;
if Sock.fd /= 0 then raise Constraint_Error; end if;
Sock.fd := Check (make_socket (Protocol_Family (Addr), SOCK_STREAM, 0));
Check (bind (Sock.fd, Address (Addr), Length (Addr)));
Check (listen (Sock.fd, int (Count)));
Sock.tag := Addr'Tag;
end Open;
function accept_connection
(socket_fd : int;
addr : sockaddr_ptr;
addrlen : access int)
return int;
pragma Import (C, accept_connection, accept_LINKNAME);
-- returns a socket ID for a new connection that has been
-- requested via the socket whose ID is given as argument.
-- The argument must be an existing socket that is bound to an address
-- and is listeninf for connections.
-- addr received the address of the connecting entity.
procedure Accept_Connection
(Server : Server_Socket;
Stream : in out Stream_Socket'Class;
Peer : in out Socket_Address'Class) is
addrlen : aliased int := Length (Peer);
use type Ada.Tags.Tag;
begin
if Server.fd = 0 then raise Constraint_Error; end if;
if Stream.fd /= 0 then raise Constraint_Error; end if;
if Server.tag /= Peer'Tag then raise Constraint_Error; end if;
-- require that the Peer and Server object be of the same type as the
-- socket address used to create the Server
Stream.fd := Check (accept_connection (Server.fd,
Address (Peer), addrlen'Unchecked_Access));
Stream.in_stream.sock := Stream'Unchecked_Access;
Stream.in_ptr := Stream.in_stream'Unchecked_Access;
Stream.out_stream.sock := Stream'Unchecked_Access;
Stream.out_ptr := Stream.out_stream'Unchecked_Access;
Stream.tag := Server.tag;
if addrlen /= Length (Peer) then raise
Constraint_Error;
end if;
end Accept_Connection;
-----------------------------------------
procedure Open
(Sock : in out Datagram_Socket;
Addr : Socket_Address'Class) is
begin
if not Valid (Addr) then raise Constraint_Error; end if;
if Sock.fd /= 0 then raise Constraint_Error; end if;
Sock.fd := Check (make_socket (Protocol_Family (Addr), SOCK_DGRAM, 0));
Check (bind (Sock.fd, Address (Addr), Length (Addr)));
Sock.tag := Addr'Tag;
end Open;
-----------------------------------------
function read
(fildes : int;
buf : System.Address;
nbyte : size_t)
return ssize_t;
pragma Import (C, read, read_LINKNAME);
function write
(fildes : int;
buf : char_ptr;
nbyte : size_t)
return ssize_t;
pragma Import (C, write, write_LINKNAME);
procedure Read
(Stream : in out Input_Stream;
Item : out Ada.Streams.Stream_Element_Array;
Last : out Ada.Streams.Stream_Element_Offset) is
use type Ada.Streams.Stream_Element_Offset;
Tmp : ssize_t;
function "+" is new
Unchecked_Conversion (System.Address, char_ptr);
begin
Tmp := read (Stream.sock.fd, Item'Address, size_t (Item'Length));
Check (int (Tmp));
Last := Item'First + Ada.Streams.Stream_Element_Offset (Tmp);
end Read;
procedure Write
(Stream : in out Input_Stream;
Item : in Ada.Streams.Stream_Element_Array) is
begin
Raise_POSIX_Error (Operation_Not_Implemented);
end Write;
procedure Read
(Stream : in out Output_Stream;
Item : out Ada.Streams.Stream_Element_Array;
Last : out Ada.Streams.Stream_Element_Offset) is
begin
Raise_POSIX_Error (Operation_Not_Implemented);
end Read;
procedure Write
(Stream : in out Output_Stream;
Item : in Ada.Streams.Stream_Element_Array) is
function "+" is new
Unchecked_Conversion (System.Address, char_ptr);
begin
Check (int (write (Stream.sock.fd, +Item'Address,
size_t (Item'Length))));
end Write;
----------------------------------------------------
function sendto
(socket_fd : int;
buf : char_ptr;
len : int;
flags : int;
from : sockaddr_ptr;
fromlen : int_ptr)
return int;
pragma Import (C, sendto, sendto_LINKNAME);
procedure Send
(Sock : in Datagram_Socket;
Addr : in Socket_Address'Class;
Data : in String) is
Data_With_NUL : POSIX_String;
begin
if not Valid (Addr) then raise Constraint_Error; end if;
if Sock.fd /= 0 then raise Constraint_Error; end if;
if Sock.tag /= Addr'Tag then raise Constraint_Error; end if;
Check (sendto (socket_fd => Sock.fd,
buf => +Data (Data'First)'Address,
len => Data'Length,
flags => 0,
from => Address (Addr),
fromlen => Length (Addr)));
end Send;
function recvfrom
(socket_fd : int;
buf : char_ptr;
len : int;
flags : int;
from : sockaddr_ptr; -- may be null
fromlen : int_ptr)
return int;
pragma Import (C, recvfrom, recvfrom_LINKNAME);
procedure Receive
(Sock : in Datagram_Socket;
Addr : out Socket_Address'Class;
Buff : in out String;
Last : out Natural) is
begin
if not Valid (Addr) then raise Constraint_Error; end if;
if Sock.fd /= 0 then raise Constraint_Error; end if;
if Sock.tag /= Addr'Tag then raise Constraint_Error; end if;
Check (recvfrom (socket_fd => Sock.fd,
buf => +Buff (Buff'First)'Address,
len => Buff'Length,
flags => 0,
from => Address (Buff),
fromlen => Length (Addr)));
end Receive;
----------------------------------------------------
-- Stuff that may be bound-to in future extensions?
-- function getsockopt
-- (socket_fd : int;
-- level : int;
-- optname : int;
-- optval : char_ptr;
-- optlen : int_ptr)
-- return int;
-- pragma Import (C, getsockopt, getsockopt_LINKNAME);
-- -- get options associated with a socket
-- function setsockopt
-- (socket_fd : int;
-- level : int;
-- optname : int;
-- optval : char_ptr;
-- optlen : int)
-- return int;
-- pragma Import (C, setsockopt, setsockopt_LINKNAME);
-- -- set options associated with a socket
-- function recv
-- (socket_fd : int;
-- buf : char_ptr;
-- len : int;
-- flags : int)
-- return int;
-- pragma Import (C, recv, recv_LINKNAME);
-- -- requires socket must be connected
-- function send
-- (socket_fd : int;
-- buf : char_ptr;
-- len : int;
-- flags : int)
-- return int;
-- pragma Import (C, send, send_LINKNAME);
-- -- requires socket must be connected
-- function sendmsg
-- (socket_fd : int;
-- msg : struct_msghdr_ptr;
-- flags : int)
-- return int;
-- pragma Import (C, recvmsg, recvmsg_LINKNAME);
-- function recvmsg
-- (socket_fd : int;
-- msg : struct_msghdr_ptr;
-- flags : int)
-- return int;
-- pragma Import (C, recvmsg, recvmsg_LINKNAME);
-- other functions we may need?
-- ioctl
-- fcntl
-- socketpair
-- shutdown
end Sockets;
|
