/usr/share/ada/adainclude/adasockets/sockets-naming.adb is in libadasockets4-dev 1.8.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- --
-- ADASOCKETS COMPONENTS --
-- --
-- S O C K E T S . N A M I N G --
-- --
-- B o d y --
-- --
-- Copyright (C) 1998-2011 Samuel Tardieu <sam@rfc1149.net> --
-- Copyright (C) 1999-2003 Télécom ParisTech --
-- --
-- AdaSockets 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. AdaSockets 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 AdaSockets; see file COPYING. If not, write to the Free --
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA --
-- 02111-1307, 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. --
-- --
-- The main repository for this software is located at: --
-- http://www.rfc1149.net/devel/adasockets.html --
-- --
-- If you have any question, please use the issues tracker at: --
-- https://github.com/samueltardieu/adasockets/issues --
-- --
-----------------------------------------------------------------------------
with Ada.Exceptions;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
with Interfaces.C; use Interfaces.C;
with Interfaces.C.Strings; use Interfaces.C.Strings;
with Sockets.Constants; use Sockets.Constants;
with Sockets.Thin; use Sockets.Thin;
with Sockets.Types; use Sockets.Types;
with Sockets.Utils; use Sockets.Utils;
package body Sockets.Naming is
function Is_IP_Address (Something : String) return Boolean
renames Sockets.Utils.Is_IP_Address;
Default_Buffer_Size : constant := 16384;
procedure Free is
new Ada.Unchecked_Deallocation (String, String_Access);
procedure Free is
new Ada.Unchecked_Deallocation (char_array, char_array_access);
function Allocate (Size : Positive := Default_Buffer_Size)
return char_array_access;
-- Allocate a buffer
function Parse_Entry (Host : Hostent)
return Host_Entry;
-- Parse an entry
procedure Raise_Naming_Error
(Errno : Integer;
Message : String);
-- Raise the exception Naming_Error with an appropriate error message
protected Naming_Lock is
entry Lock;
procedure Unlock;
private
Locked : Boolean := False;
end Naming_Lock;
-- A locking object
function Get_Peer (Socket : Socket_FD) return Sockaddr_In;
function Get_Sock (Socket : Socket_FD) return Sockaddr_In;
----------------
-- Address_Of --
----------------
function Address_Of (Something : String)
return Address
is
begin
if Is_IP_Address (Something) then
return Value (Something);
else
return Info_Of (Something) .Addresses (1);
end if;
end Address_Of;
------------
-- Adjust --
------------
procedure Adjust (Object : in out Host_Entry)
is
Aliases : String_Array renames Object.Aliases;
begin
Object.Name := new String'(Object.Name.all);
for I in Aliases'Range loop
Aliases (I) := new String'(Aliases (I) .all);
end loop;
end Adjust;
--------------
-- Allocate --
--------------
function Allocate
(Size : Positive := Default_Buffer_Size)
return char_array_access
is
begin
return new char_array (1 .. size_t (Size));
end Allocate;
-----------------
-- Any_Address --
-----------------
function Any_Address return Address
is
begin
return To_Address (Inaddr_Any);
end Any_Address;
--------------
-- Finalize --
--------------
procedure Finalize (Object : in out Host_Entry)
is
Aliases : String_Array renames Object.Aliases;
begin
Free (Object.Name);
for I in Aliases'Range loop
Free (Aliases (I));
end loop;
end Finalize;
--------------
-- Get_Peer --
--------------
function Get_Peer (Socket : Socket_FD) return Sockaddr_In is
Name : aliased Sockaddr_In;
Len : aliased int := Name'Size / 8;
begin
if C_Getpeername (Socket.FD, Name'Address, Len'Access) = Failure then
Raise_Naming_Error (Errno, "");
end if;
return Name;
end Get_Peer;
-------------------
-- Get_Peer_Addr --
-------------------
function Get_Peer_Addr (Socket : Socket_FD) return Types.In_Addr is
begin
return Get_Peer (Socket) .Sin_Addr;
end Get_Peer_Addr;
-------------------
-- Get_Peer_Addr --
-------------------
function Get_Peer_Addr (Socket : Socket_FD) return Address is
begin
return To_Address (Get_Peer_Addr (Socket));
end Get_Peer_Addr;
-------------------
-- Get_Peer_Port --
-------------------
function Get_Peer_Port (Socket : Socket_FD) return Positive is
begin
return Positive (Network_To_Port (Get_Peer (Socket) .Sin_Port));
end Get_Peer_Port;
--------------
-- Get_Sock --
--------------
function Get_Sock (Socket : Socket_FD) return Sockaddr_In is
Name : aliased Sockaddr_In;
Len : aliased int := Name'Size / 8;
begin
if C_Getsockname (Socket.FD, Name'Address, Len'Access) = Failure then
Raise_Naming_Error (Errno, "");
end if;
return Name;
end Get_Sock;
-------------------
-- Get_Sock_Addr --
-------------------
function Get_Sock_Addr (Socket : Socket_FD) return In_Addr is
begin
return Get_Sock (Socket) .Sin_Addr;
end Get_Sock_Addr;
-------------------
-- Get_Sock_Addr --
-------------------
function Get_Sock_Addr (Socket : Socket_FD) return Address is
begin
return To_Address (Get_Sock_Addr (Socket));
end Get_Sock_Addr;
-------------------
-- Get_Sock_Port --
-------------------
function Get_Sock_Port (Socket : Socket_FD) return Positive is
begin
return Positive (Network_To_Port (Get_Sock (Socket) .Sin_Port));
end Get_Sock_Port;
---------------
-- Host_Name --
---------------
function Host_Name return String
is
Buff : char_array_access := Allocate;
Buffer : constant chars_ptr := To_Chars_Ptr (Buff);
Res : constant int := C_Gethostname (Buffer, Buff'Length);
begin
if Res = Failure then
Free (Buff);
Raise_Naming_Error (Errno, "");
end if;
declare
Result : constant String := Value (Buffer);
begin
Free (Buff);
return Result;
end;
end Host_Name;
-----------
-- Image --
-----------
function Image (Add : Address) return String
is
function Image (A : Address_Component) return String;
-- Return the string corresponding to its argument without
-- the leading space.
-----------
-- Image --
-----------
function Image (A : Address_Component)
return String
is
Im : constant String := Address_Component'Image (A);
begin
return Im (Im'First + 1 .. Im'Last);
end Image;
begin
return Image (Add.H1) & "." & Image (Add.H2) & "." &
Image (Add.H3) & "." & Image (Add.H4);
end Image;
-----------
-- Image --
-----------
function Image (Add : Types.In_Addr) return String is
begin
return Image (To_Address (Add));
end Image;
-------------
-- Info_Of --
-------------
function Info_Of (Name : String)
return Host_Entry
is
Res : Hostent_Access;
C_Name : chars_ptr := New_String (Name);
begin
Naming_Lock.Lock;
Res := C_Gethostbyname (C_Name);
Free (C_Name);
if Res = null then
Naming_Lock.Unlock;
Raise_Naming_Error (Errno, Name);
end if;
declare
Result : constant Host_Entry := Parse_Entry (Res.all);
begin
Naming_Lock.Unlock;
return Result;
end;
end Info_Of;
-------------
-- Info_Of --
-------------
function Info_Of (Addr : Address)
return Host_Entry
is
function Convert is
new Ada.Unchecked_Conversion (Source => In_Addr_Access,
Target => chars_ptr);
Temp : aliased In_Addr := To_In_Addr (Addr);
C_Addr : constant chars_ptr := Convert (Temp'Unchecked_Access);
Res : Hostent_Access;
begin
Naming_Lock.Lock;
Res := C_Gethostbyaddr (C_Addr,
int (Temp'Size / CHAR_BIT),
Constants.Af_Inet);
if Res = null then
Naming_Lock.Unlock;
Raise_Naming_Error (Errno, Image (Addr));
end if;
declare
Result : constant Host_Entry := Parse_Entry (Res.all);
begin
Naming_Lock.Unlock;
return Result;
end;
end Info_Of;
------------------------
-- Info_Of_Name_Or_IP --
------------------------
function Info_Of_Name_Or_IP (Something : String)
return Host_Entry
is
begin
if Is_IP_Address (Something) then
return Info_Of (Value (Something));
else
return Info_Of (Something);
end if;
end Info_Of_Name_Or_IP;
-------------
-- Name_Of --
-------------
function Name_Of (Something : String)
return String
is
Hostent : constant Host_Entry := Info_Of_Name_Or_IP (Something);
begin
if Hostent.Name = null then
Ada.Exceptions.Raise_Exception (Naming_Error'Identity,
"No name for " & Something);
end if;
return Hostent.Name.all;
end Name_Of;
-----------------
-- Naming_Lock --
-----------------
protected body Naming_Lock is
----------
-- Lock --
----------
entry Lock when not Locked is
begin
Locked := True;
end Lock;
------------
-- Unlock --
------------
procedure Unlock is
begin
Locked := False;
end Unlock;
end Naming_Lock;
-----------------
-- Parse_Entry --
-----------------
function Parse_Entry (Host : Hostent)
return Host_Entry
is
C_Aliases : constant Thin.Chars_Ptr_Array :=
Chars_Ptr_Pointers.Value (Host.H_Aliases);
C_Addr : constant In_Addr_Access_Array :=
In_Addr_Access_Pointers.Value
(Host.H_Addr_List);
Result : Host_Entry (N_Aliases => C_Aliases'Length - 1,
N_Addresses => C_Addr'Length - 1);
begin
Result.Name := new String'(Value (Host.H_Name));
for I in 1 .. Result.Aliases'Last loop
declare
Index : constant Natural := I - 1 + Natural (C_Aliases'First);
Current : chars_ptr renames C_Aliases (size_t (Index));
begin
Result.Aliases (I) := new String'(Value (Current));
end;
end loop;
for I in Result.Addresses'Range loop
declare
Index : constant Natural := I - 1 + Natural (C_Addr'First);
Current : In_Addr_Access renames C_Addr (Index);
begin
Result.Addresses (I) := To_Address (Current.all);
end;
end loop;
return Result;
end Parse_Entry;
------------------------
-- Raise_Naming_Error --
------------------------
procedure Raise_Naming_Error
(Errno : Integer;
Message : String)
is
function Error_Message return String;
-- Return the message according to Errno.
-------------------
-- Error_Message --
-------------------
function Error_Message return String is
begin
case Errno is
when Host_Not_Found => return "Host not found";
when Try_Again => return "Try again";
when No_Recovery => return "No recovery";
when No_Address => return "No address";
when others => return "Unknown error" &
Integer'Image (Errno);
end case;
end Error_Message;
begin
Ada.Exceptions.Raise_Exception (Naming_Error'Identity,
Error_Message & ": " & Message);
end Raise_Naming_Error;
----------------
-- To_Address --
----------------
function To_Address (Addr : In_Addr) return Address
is
begin
return (H1 => Address_Component (Addr.S_B1),
H2 => Address_Component (Addr.S_B2),
H3 => Address_Component (Addr.S_B3),
H4 => Address_Component (Addr.S_B4));
end To_Address;
----------------
-- To_In_Addr --
----------------
function To_In_Addr (Addr : Address) return In_Addr
is
begin
return (S_B1 => unsigned_char (Addr.H1),
S_B2 => unsigned_char (Addr.H2),
S_B3 => unsigned_char (Addr.H3),
S_B4 => unsigned_char (Addr.H4));
end To_In_Addr;
-----------
-- Value --
-----------
function Value (Add : String) return Address is
C_Add : chars_ptr := New_String (Add);
Converted : aliased In_Addr;
begin
if C_Inet_Aton (C_Add, Converted'Unchecked_Access) = 0 then
Ada.Exceptions.Raise_Exception (Naming_Error'Identity,
Add & " is not an IP address");
end if;
Free (C_Add);
return (H1 => Address_Component (Converted.S_B1),
H2 => Address_Component (Converted.S_B2),
H3 => Address_Component (Converted.S_B3),
H4 => Address_Component (Converted.S_B4));
end Value;
end Sockets.Naming;
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