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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--    G N A T . S O C K E T S . T H I N . T A S K _ S A F E _ N E T D B     --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                  Copyright (C) 2007-2008, AdaCore                        --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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 GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This version is used on VxWorks. Note that the corresponding spec is in

--  g-sttsne-locking.ads.

with Ada.Unchecked_Conversion;

with Interfaces.C; use Interfaces.C;

package body GNAT.Sockets.Thin.Task_Safe_NetDB is

   --  The following additional data is returned by Safe_Gethostbyname

   --  and Safe_Getostbyaddr in the user provided buffer.

   type Netdb_Host_Data (Name_Length : C.size_t) is record

      Address   : aliased In_Addr;

      Addr_List : aliased In_Addr_Access_Array (0 .. 1);

      Name      : aliased C.char_array (0 .. Name_Length);

   end record;

   Alias_Access : constant Chars_Ptr_Pointers.Pointer :=

                    new C.Strings.chars_ptr'(C.Strings.Null_Ptr);

   --  Constant used to create a Hostent record manually

   ------------------------

   -- Safe_Gethostbyaddr --

   ------------------------

   function Safe_Gethostbyaddr

     (Addr      : System.Address;

      Addr_Len  : C.int;

      Addr_Type : C.int;

      Ret       : not null access Hostent;

      Buf       : System.Address;

      Buflen    : C.int;

      H_Errnop  : not null access C.int) return C.int

   is

      type int_Access is access int;

      function To_Pointer is

        new Ada.Unchecked_Conversion (System.Address, int_Access);

      function VxWorks_hostGetByAddr

        (Addr : C.int; Buf : System.Address) return C.int;

      pragma Import (C, VxWorks_hostGetByAddr, "hostGetByAddr");

      Netdb_Data : Netdb_Host_Data (Name_Length => Max_Name_Length);

      pragma Import (Ada, Netdb_Data);

      for Netdb_Data'Address use Buf;

   begin

      pragma Assert (Addr_Type = SOSC.AF_INET);

      pragma Assert (Addr_Len = In_Addr'Size / 8);

      --  Check that provided buffer is sufficiently large to hold the

      --  data we want to return.

      if Netdb_Data'Size / 8 > Buflen then

         H_Errnop.all := SOSC.ERANGE;

         return -1;

      end if;

      if VxWorks_hostGetByAddr (To_Pointer (Addr).all,

                                Netdb_Data.Name'Address)

           /= SOSC.OK

      then

         H_Errnop.all := C.int (Host_Errno);

         return -1;

      end if;

      Netdb_Data.Address   := To_In_Addr (To_Pointer (Addr).all);

      Netdb_Data.Addr_List :=

        (0 => Netdb_Data.Address'Unchecked_Access,

         1 => null);

      Ret.H_Name      := C.Strings.To_Chars_Ptr

                           (Netdb_Data.Name'Unrestricted_Access);

      Ret.H_Aliases   := Alias_Access;

      Ret.H_Addrtype  := SOSC.AF_INET;

      Ret.H_Length    := 4;

      Ret.H_Addr_List :=

        Netdb_Data.Addr_List (Netdb_Data.Addr_List'First)'Unchecked_Access;

      return 0;

   end Safe_Gethostbyaddr;

   ------------------------

   -- Safe_Gethostbyname --

   ------------------------

   function Safe_Gethostbyname

     (Name     : C.char_array;

      Ret      : not null access Hostent;

      Buf      : System.Address;

      Buflen   : C.int;

      H_Errnop : not null access C.int) return C.int

   is

      function VxWorks_hostGetByName

        (Name : C.char_array) return C.int;

      pragma Import (C, VxWorks_hostGetByName, "hostGetByName");

      Addr : C.int;

   begin

      Addr := VxWorks_hostGetByName (Name);

      if Addr = SOSC.ERROR then

         H_Errnop.all := C.int (Host_Errno);

         return -1;

      end if;

      declare

         Netdb_Data : Netdb_Host_Data (Name_Length => Name'Length);

         pragma Import (Ada, Netdb_Data);

         for Netdb_Data'Address use Buf;

      begin

         --  Check that provided buffer is sufficiently large to hold the

         --  data we want to return.

         if Netdb_Data'Size / 8 > Buflen then

            H_Errnop.all := SOSC.ERANGE;

            return -1;

         end if;

         Netdb_Data.Address   := To_In_Addr (Addr);

         Netdb_Data.Addr_List :=

           (0 => Netdb_Data.Address'Unchecked_Access,

            1 => null);

         Netdb_Data.Name (Netdb_Data.Name'First .. Name'Length - 1) := Name;

         Ret.H_Name      := C.Strings.To_Chars_Ptr

                              (Netdb_Data.Name'Unrestricted_Access);

         Ret.H_Aliases   := Alias_Access;

         Ret.H_Addrtype  := SOSC.AF_INET;

         Ret.H_Length    := 4;

         Ret.H_Addr_List :=

           Netdb_Data.Addr_List (Netdb_Data.Addr_List'First)'Unchecked_Access;

      end;

      return 0;

   end Safe_Gethostbyname;

   ------------------------

   -- Safe_Getservbyname --

   ------------------------

   function Safe_Getservbyname

     (Name     : C.char_array;

      Proto    : C.char_array;

      Ret      : not null access Servent;

      Buf      : System.Address;

      Buflen   : C.int) return C.int

   is

      pragma Unreferenced (Name, Proto, Ret, Buf, Buflen);

   begin

      --  Not available under VxWorks

      return -1;

   end Safe_Getservbyname;

   ------------------------

   -- Safe_Getservbyport --

   ------------------------

   function Safe_Getservbyport

     (Port     : C.int;

      Proto    : C.char_array;

      Ret      : not null access Servent;

      Buf      : System.Address;

      Buflen   : C.int) return C.int

   is

      pragma Unreferenced (Port, Proto, Ret, Buf, Buflen);

   begin

      --  Not available under VxWorks

      return -1;

   end Safe_Getservbyport;

end GNAT.Sockets.Thin.Task_Safe_NetDB;