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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README b/README
new file mode 100644
index 0000000..c285b32
--- /dev/null
+++ b/README
@@ -0,0 +1,27 @@
+                               The Ada Milter API
+
+   The Ada Milter API is a binding to Libmilter, the Sendmail mail filtering
+   API. A milter is a daemon that assists a Mail Transfer Agent, such as
+   Sendmail or Postfix, in checking messages and deciding whether to accept,
+   reject or modify them. This binding lets you write milters in Ada.
+
+Compatibility
+
+   Version 1.1.1 of the Milter API is intended to match the version of
+   Libmilter that comes with Sendmail 8.13.8, where the value of SMFI_VERSION
+   is 2. It provides almost all of the features in that version of Libmilter,
+   but lacks features introduced in later versions. This version of the
+   Milter API has been used successfully with Postfix 2.3.8.
+
+Documentation
+
+   There is documentation in the form of comments in the package
+   specification. In addition to those you should probably read the Libmilter
+   documentation, which is available at Milter.org and is also included with
+   Sendmail.
+
+License
+
+   The Ada Milter API is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License version 3, as
+   published by the Free Software Foundation.
diff --git a/milter_api.adb b/milter_api.adb
new file mode 100644
index 0000000..f99235d
--- /dev/null
+++ b/milter_api.adb
@@ -0,0 +1,778 @@
+-- Milter API for Ada, a binding to Libmilter, the Sendmail mail filtering API
+-- Copyright 2009 B. Persson, Bjorn@Rombobeorn.se
+--
+-- This library is free software: you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License version 3, as published
+-- by the Free Software Foundation.
+
+
+with Ada.Exceptions; use Ada.Exceptions;
+with Ada.Strings.Fixed;
+with System_Log; use System_Log;
+
+package body Milter_API is
+
+   pragma Linker_Options("-lmilter");
+   pragma Linker_Options("-lpthread");
+
+   use Ada.Strings.Unbounded;
+   use type String_Arrays.Pointer;
+
+
+   Version : constant Binding_Version_Type := (1, 1, 1);
+
+   function Binding_Version return Binding_Version_Type is
+   begin
+      return Version;
+   end Binding_Version;
+
+   function Binding_Version_String return String is
+      use Ada.Strings, Ada.Strings.Fixed;
+   begin
+      return Trim(Version.Specification_Major'Img, Left) & '.' &
+             Trim(Version.Specification_Minor'Img, Left) & '.' &
+             Trim(Version.Implementation'Img, Left);
+   end Binding_Version_String;
+
+   Target_Version : constant int := 2;
+   -- Target_Version is the value of SMFI_VERSION in the version of Libmilter
+   -- that this version of Milter_API is intended to match.
+
+
+   Real_Connect_Handler            : Connect_Handler;
+   Real_Helo_Handler               : Helo_Handler;
+   Real_Envelope_Sender_Handler    : Envelope_Sender_Handler;
+   Real_Envelope_Recipient_Handler : Envelope_Recipient_Handler;
+   Real_Header_Handler             : Header_Handler;
+   Real_End_Of_Headers_Handler     : End_Of_Headers_Handler;
+   Real_Body_Handler               : Body_Handler;
+   Real_End_Of_Message_Handler     : End_Of_Message_Handler;
+   Real_Abort_Handler              : Abort_Handler;
+   Real_Close_Handler              : Close_Handler;
+   Real_Unknown_Command_Handler    : Unknown_Command_Handler;
+   Real_Data_Handler               : Data_Handler;
+
+
+   type sfsistat is new int;
+
+
+   procedure Oops(E : Exception_Occurrence) is
+   begin
+      Log(Error, Exception_Information(E));
+      Stop;
+   end Oops;
+
+   function Oops(E : Exception_Occurrence) return sfsistat is
+   begin
+      Oops(E);
+      return sfsistat(Accept_Definitely);
+   end Oops;
+
+
+   type C_Connect_Handler is access function
+      (ctx      : SMFICTX_Pointer;
+       hostname : chars_ptr;
+       hostaddr : access Dummy_Type)
+      return sfsistat;
+   pragma convention(C, C_Connect_Handler);
+
+   function Connect_Relay
+      (ctx      : SMFICTX_Pointer;
+       hostname : chars_ptr;
+       hostaddr : access Dummy_Type)
+      return sfsistat;
+   pragma convention(C, Connect_Relay);
+
+   function Connect_Relay
+      (ctx      : SMFICTX_Pointer;
+       hostname : chars_ptr;
+       hostaddr : access Dummy_Type)
+      return sfsistat
+   is
+      Dummy : Sockaddr;
+   begin
+      return sfsistat(Real_Connect_Handler(ctx, Value(hostname), Dummy));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Connect_Relay;
+
+   type C_Helo_Handler is access function
+      (ctx      : SMFICTX_Pointer;
+       helohost : chars_ptr)
+      return sfsistat;
+   pragma convention(C, C_Helo_Handler);
+
+   function Helo_Relay
+      (ctx      : SMFICTX_Pointer;
+       helohost : chars_ptr)
+      return sfsistat;
+   pragma convention(C, Helo_Relay);
+
+   function Helo_Relay
+      (ctx      : SMFICTX_Pointer;
+       helohost : chars_ptr)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Helo_Handler(ctx, Value(helohost)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Helo_Relay;
+
+   type C_Envelope_Sender_Handler is access function
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat;
+   pragma convention(C, C_Envelope_Sender_Handler);
+
+   function Envelope_Sender_Relay
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat;
+   pragma convention(C, Envelope_Sender_Relay);
+
+   function Envelope_Sender_Relay
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Envelope_Sender_Handler
+                              (ctx, Value(argv.all), (Pointer => argv + 1)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Envelope_Sender_Relay;
+
+   type C_Envelope_Recipient_Handler is access function
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat;
+   pragma convention(C, C_Envelope_Recipient_Handler);
+
+   function Envelope_Recipient_Relay
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat;
+   pragma convention(C, Envelope_Recipient_Relay);
+
+   function Envelope_Recipient_Relay
+      (ctx  : SMFICTX_Pointer;
+       argv : String_Arrays.Pointer)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Envelope_Recipient_Handler
+                              (ctx, Value(argv.all), (Pointer => argv + 1)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Envelope_Recipient_Relay;
+
+   type C_Data_Handler is access function
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, C_Data_Handler);
+
+   function Data_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, Data_Relay);
+
+   function Data_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Data_Handler(ctx));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Data_Relay;
+
+   type C_Unknown_Command_Handler is access function
+      (ctx : SMFICTX_Pointer;
+       arg : chars_ptr)
+      return sfsistat;
+   pragma convention(C, C_Unknown_Command_Handler);
+
+   function Unknown_Command_Relay
+      (ctx : SMFICTX_Pointer;
+       arg : chars_ptr)
+      return sfsistat;
+   pragma convention(C, Unknown_Command_Relay);
+
+   function Unknown_Command_Relay
+      (ctx : SMFICTX_Pointer;
+       arg : chars_ptr)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Unknown_Command_Handler(ctx, Value(arg)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Unknown_Command_Relay;
+
+   type C_Header_Handler is access function
+      (ctx     : SMFICTX_Pointer;
+       headerf : chars_ptr;
+       headerv : chars_ptr)
+      return sfsistat;
+   pragma convention(C, C_Header_Handler);
+
+   function Header_Relay
+      (ctx     : SMFICTX_Pointer;
+       headerf : chars_ptr;
+       headerv : chars_ptr)
+      return sfsistat;
+   pragma convention(C, Header_Relay);
+
+   function Header_Relay
+      (ctx     : SMFICTX_Pointer;
+       headerf : chars_ptr;
+       headerv : chars_ptr)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Header_Handler(ctx, Value(headerf), Value(headerv)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Header_Relay;
+
+   type C_End_Of_Headers_Handler is access function
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, C_End_Of_Headers_Handler);
+
+   function End_Of_Headers_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, End_Of_Headers_Relay);
+
+   function End_Of_Headers_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_End_Of_Headers_Handler(ctx));
+   exception
+      when E : others =>
+         return Oops(E);
+   end End_Of_Headers_Relay;
+
+   type C_Body_Handler is access function
+      (ctx   : SMFICTX_Pointer;
+       bodyp : chars_ptr;
+       len   : size_t)
+      return sfsistat;
+   pragma convention(C, C_Body_Handler);
+
+   function Body_Relay
+      (ctx   : SMFICTX_Pointer;
+       bodyp : chars_ptr;
+       len   : size_t)
+      return sfsistat;
+   pragma convention(C, Body_Relay);
+
+   function Body_Relay
+      (ctx   : SMFICTX_Pointer;
+       bodyp : chars_ptr;
+       len   : size_t)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_Body_Handler(ctx, Value(bodyp, len)));
+   exception
+      when E : others =>
+         return Oops(E);
+   end Body_Relay;
+
+   type C_End_Of_Message_Handler is access function
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, C_End_Of_Message_Handler);
+
+   function End_Of_Message_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, End_Of_Message_Relay);
+
+   function End_Of_Message_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat
+   is
+   begin
+      return sfsistat(Real_End_Of_Message_Handler(ctx));
+   exception
+      when E : others =>
+         return Oops(E);
+   end End_Of_Message_Relay;
+
+   type C_Abort_Handler is access function
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, C_Abort_Handler);
+
+   function Abort_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, Abort_Relay);
+
+   function Abort_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat
+   is
+   begin
+      Real_Abort_Handler(ctx);
+      return sfsistat(Continue);
+   exception
+      when E : others =>
+         return Oops(E);
+   end Abort_Relay;
+
+   type C_Close_Handler is access function
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, C_Close_Handler);
+
+   function Close_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat;
+   pragma convention(C, Close_Relay);
+
+   function Close_Relay
+      (ctx : SMFICTX_Pointer)
+      return sfsistat
+   is
+   begin
+      Real_Close_Handler(ctx);
+      return sfsistat(Continue);
+   exception
+      when E : others =>
+         return Oops(E);
+   end Close_Relay;
+
+
+   procedure Check_For_Error(Function_Name : String; Result_Code : int) is
+      MI_SUCCESS : constant := 0;
+      MI_FAILURE : constant := -1;
+   begin
+      case Result_Code is
+         when MI_SUCCESS =>
+            return;
+         when MI_FAILURE =>
+            raise Failure with Function_Name & " reported failure.";
+         when others =>
+            raise Unknown_Error with
+               Function_Name & " returned the undocumented result code " &
+               Ada.Strings.Fixed.Trim(Result_Code'Img, Ada.Strings.Left) & '.';
+      end case;
+   end Check_For_Error;
+
+
+   procedure Register
+      (Name                              : String;
+       Connected                         : Connect_Handler            := null;
+       Helo                              : Helo_Handler               := null;
+       Envelope_Sender                   : Envelope_Sender_Handler    := null;
+       Envelope_Recipient                : Envelope_Recipient_Handler := null;
+       Data                              : Data_Handler               := null;
+       Unknown_Command                   : Unknown_Command_Handler    := null;
+       Header                            : Header_Handler             := null;
+       End_Of_Headers                    : End_Of_Headers_Handler     := null;
+       Body_Chunk                        : Body_Handler               := null;
+       End_Of_Message                    : End_Of_Message_Handler     := null;
+       Aborted                           : Abort_Handler              := null;
+       Closed                            : Close_Handler              := null;
+       May_Add_Headers                   : Boolean                    := False;
+       May_Change_Or_Delete_Headers      : Boolean                    := False;
+       May_Replace_Body                  : Boolean                    := False;
+       May_Add_Recepients                : Boolean                    := False;
+       May_Remove_Recepients             : Boolean                    := False;
+       May_Quarantine                    : Boolean                    := False)
+   is
+
+      SMFIF_ADDHDRS     : constant := 16#1#;    -- add headers
+      SMFIF_CHGBODY     : constant := 16#2#;    -- replace body
+      SMFIF_ADDRCPT     : constant := 16#4#;    -- add envelope recipients
+      SMFIF_DELRCPT     : constant := 16#8#;    -- delete envelope recipients
+      SMFIF_CHGHDRS     : constant := 16#10#;   -- change/delete headers
+      SMFIF_QUARANTINE  : constant := 16#20#;   -- quarantine envelope
+
+      function BI(B : Boolean) return unsigned_long is
+      begin
+         if B then
+            return 1;
+         else
+            return 0;
+         end if;
+      end BI;
+
+      type smfiDesc is record
+         xxfi_name      : chars_ptr     := New_String(Name);
+         xxfi_version   : int           := Target_Version;
+         xxfi_flags     : unsigned_long :=
+            SMFIF_ADDHDRS     * BI(May_Add_Headers) +
+            SMFIF_CHGHDRS     * BI(May_Change_Or_Delete_Headers) +
+            SMFIF_CHGBODY     * BI(May_Replace_Body) +
+            SMFIF_ADDRCPT     * BI(May_Add_Recepients) +
+            SMFIF_DELRCPT     * BI(May_Remove_Recepients) +
+            SMFIF_QUARANTINE  * BI(May_Quarantine);
+         xxfi_connect   : C_Connect_Handler            := null;
+         xxfi_helo      : C_Helo_Handler               := null;
+         xxfi_envfrom   : C_Envelope_Sender_Handler    := null;
+         xxfi_envrcpt   : C_Envelope_Recipient_Handler := null;
+         xxfi_header    : C_Header_Handler             := null;
+         xxfi_eoh       : C_End_Of_Headers_Handler     := null;
+         xxfi_body      : C_Body_Handler               := null;
+         xxfi_eom       : C_End_Of_Message_Handler     := null;
+         xxfi_abort     : C_Abort_Handler              := null;
+         xxfi_close     : C_Close_Handler              := null;
+         xxfi_unknown   : C_Unknown_Command_Handler    := null;
+         xxfi_data      : C_Data_Handler               := null;
+      end record;
+      pragma convention(C_Pass_By_Copy, smfiDesc);
+      Definition : smfiDesc;
+
+      function smfi_register(descr : smfiDesc) return int;
+      pragma import(C, smfi_register);
+
+   begin  -- Register
+
+      if Connected /= null then
+         Real_Connect_Handler := Connected;
+         Definition.xxfi_connect := Connect_Relay'Access;
+      end if;
+      if Helo /= null then
+         Real_Helo_Handler := Helo;
+         Definition.xxfi_helo := Helo_Relay'Access;
+      end if;
+      if Envelope_Sender /= null then
+         Real_Envelope_Sender_Handler := Envelope_Sender;
+         Definition.xxfi_envfrom := Envelope_Sender_Relay'Access;
+      end if;
+      if Envelope_Recipient /= null then
+         Real_Envelope_Recipient_Handler := Envelope_Recipient;
+         Definition.xxfi_envrcpt := Envelope_Recipient_Relay'Access;
+      end if;
+      if Header /= null then
+         Real_Header_Handler := Header;
+         Definition.xxfi_header := Header_Relay'Access;
+      end if;
+      if End_Of_Headers /= null then
+         Real_End_Of_Headers_Handler := End_Of_Headers;
+         Definition.xxfi_eoh := End_Of_Headers_Relay'Access;
+      end if;
+      if Body_Chunk /= null then
+         Real_Body_Handler := Body_Chunk;
+         Definition.xxfi_body := Body_Relay'Access;
+      end if;
+      if End_Of_Message /= null then
+         Real_End_Of_Message_Handler := End_Of_Message;
+         Definition.xxfi_eom := End_Of_Message_Relay'Access;
+      end if;
+      if Aborted /= null then
+         Real_Abort_Handler := Aborted;
+         Definition.xxfi_abort := Abort_Relay'Access;
+      end if;
+      if Closed /= null then
+         Real_Close_Handler := Closed;
+         Definition.xxfi_close := Close_Relay'Access;
+      end if;
+      if Unknown_Command /= null then
+         Real_Unknown_Command_Handler := Unknown_Command;
+         Definition.xxfi_unknown := Unknown_Command_Relay'Access;
+      end if;
+      if Data /= null then
+         Real_Data_Handler := Data;
+         Definition.xxfi_data := Data_Relay'Access;
+      end if;
+
+      Check_For_Error("smfi_register", smfi_register(Definition));
+
+   end Register;
+
+
+   procedure Set_Timeout(Timeout : Natural) is
+      function smfi_settimeout(otimeout : int) return int;
+      pragma import(C, smfi_settimeout);
+   begin
+      Check_For_Error("smfi_settimeout", smfi_settimeout(int(Timeout)));
+   end Set_Timeout;
+
+   procedure Set_Connection_Queue_Length(Length : Positive) is
+      function smfi_setbacklog(obacklog : int) return int;
+      pragma import(C, smfi_setbacklog);
+   begin
+      Check_For_Error("smfi_setbacklog", smfi_setbacklog(int(Length)));
+   end Set_Connection_Queue_Length;
+
+   procedure Set_Socket(Address : String) is
+      function smfi_setconn(oconn : char_array) return int;
+      pragma import(C, smfi_setconn);
+   begin
+      Check_For_Error("smfi_setconn", smfi_setconn(To_C(Address)));
+   end Set_Socket;
+
+   procedure Open_Socket(Remove_Old_Socket : Boolean) is
+      function smfi_opensocket(rmsocket : int) return int;
+      -- rmsocket is declared as bool. I hope a bool is always an int.
+      pragma import(C, smfi_opensocket);
+      function I(B : Boolean) return int is
+      begin if B then return 1; else return 0; end if; end I;
+   begin
+      Check_For_Error("smfi_opensocket", smfi_opensocket(I(Remove_Old_Socket)));
+   end Open_Socket;
+
+   procedure Main is
+      function smfi_main return int;
+      pragma import(C, smfi_main);
+   begin
+      Check_For_Error("smfi_main", smfi_main);
+   end Main;
+
+   procedure Set_Debug_Level(Level : Natural) is
+      function smfi_setdbg(level : int) return int;
+      pragma import(C, smfi_setdbg);
+   begin
+      Check_For_Error("smfi_setdbg", smfi_setdbg(int(Level)));
+   end Set_Debug_Level;
+
+   procedure Stop is
+      procedure smfi_stop;
+      pragma import(C, smfi_stop);
+   begin
+      smfi_stop;
+   end Stop;
+
+   function Arguments(Handle : Arguments_Handle) return Unbounded_Strings is
+      Ustrings : Unbounded_Strings
+                 (1 .. Natural(String_Arrays.Virtual_Length(Handle.Pointer)));
+      Current  : String_Arrays.Pointer := Handle.Pointer;
+   begin
+      for Index in Ustrings'Range loop
+         Set_Unbounded_String(Ustrings(Index), Value(Current.all));
+         String_Arrays.Increment(Current);
+      end loop;
+      return Ustrings;
+   end Arguments;
+
+   procedure Get_Symbol_Value
+      (Context : in  SMFICTX_Pointer;
+       Name    : in  String;
+       Defined : out Boolean;
+       Value   : out Unbounded_String)
+   is
+      function smfi_getsymval
+         (ctx     : SMFICTX_Pointer;
+          symname : char_array)
+         return chars_ptr;
+      pragma import(C, smfi_getsymval);
+      Answer : chars_ptr;
+   begin
+      Answer := smfi_getsymval(Context, To_C(Name));
+      Defined := Answer /= Null_Ptr;
+      if Defined then
+         Set_Unbounded_String(Value, Strings.Value(Answer));
+      end if;
+   end Get_Symbol_Value;
+
+   procedure Set_Private_Data
+      (Context : SMFICTX_Pointer;
+       Data    : Milter_Data_Pointer)
+   is
+      pragma Warnings(Off);  -- Milter_Data doesn't correspond to any C type.
+      function smfi_setpriv
+         (ctx         : SMFICTX_Pointer;
+          privatedata : Milter_Data_Pointer)
+         return int;
+      pragma Warnings(On);
+      pragma import(C, smfi_setpriv);
+      -- It doesn't matter that Milter_Data doesn't correspond to any C type,
+      -- because Libmilter only stores the pointer and doesn't care what it
+      -- points to.
+   begin
+      Check_For_Error("smfi_setpriv", smfi_setpriv(Context, Data));
+   end Set_Private_Data;
+
+   function Private_Data
+      (Context : SMFICTX_Pointer)
+      return Milter_Data_Pointer
+   is
+      pragma Warnings(Off);  -- Milter_Data doesn't correspond to any C type.
+      function smfi_getpriv(ctx : SMFICTX_Pointer) return Milter_Data_Pointer;
+      pragma Warnings(On);
+      pragma import(C, smfi_getpriv);
+   begin
+      return smfi_getpriv(Context);
+   end Private_Data;
+
+   procedure Set_Reply
+      (Context       : SMFICTX_Pointer;
+       Reply_Code    : String_Of_Three;
+       Extended_Code : String := "";
+       Message       : String := "")
+   is
+      function smfi_setreply
+         (ctx     : SMFICTX_Pointer;
+          rcode   : char_array;
+          xcode   : chars_ptr;
+          message : chars_ptr)
+         return int;
+      pragma import(C, smfi_setreply);
+      C_Extended_Code   : aliased char_array := To_C(Extended_Code);
+      C_Message         : aliased char_array := To_C(Message);
+      Extended_Code_Ptr : chars_ptr := Null_Ptr;
+      Message_Ptr       : chars_ptr := Null_Ptr;
+   begin
+      if Extended_Code'Length > 0 then
+         Extended_Code_Ptr := To_Chars_Ptr(C_Extended_Code'Unchecked_Access);
+      end if;
+      if Message'Length > 0 then
+         Message_Ptr := To_Chars_Ptr(C_Message'Unchecked_Access);
+      end if;
+      Check_For_Error("smfi_setreply",
+                      smfi_setreply(Context,
+                                    To_C(Reply_Code),
+                                    Extended_Code_Ptr,
+                                    Message_Ptr));
+   end Set_Reply;
+
+
+   procedure Add_Header
+      (Context : SMFICTX_Pointer;
+       Name    : String;
+       Value   : String)
+   is
+      function smfi_addheader
+         (ctx     : SMFICTX_Pointer;
+          headerf : char_array;
+          headerv : char_array)
+         return int;
+      pragma import(C, smfi_addheader);
+   begin
+      Check_For_Error("smfi_addheader",
+                      smfi_addheader(Context, To_C(Name), To_C(Value)));
+   end Add_Header;
+
+   procedure Change_Header
+      (Context : SMFICTX_Pointer;
+       Name    : String;
+       Index   : Positive;
+       Value   : String)
+   is
+      function smfi_chgheader
+         (ctx     : SMFICTX_Pointer;
+          headerf : char_array;
+          hdridx  : int;
+          headerv : char_array)
+         return int;
+      pragma import(C, smfi_chgheader);
+   begin
+      Check_For_Error("smfi_chgheader",
+                      smfi_chgheader(Context,
+                                     To_C(Name),
+                                     int(Index),
+                                     To_C(Value)));
+   end Change_Header;
+
+   procedure Delete_Header
+      (Context : SMFICTX_Pointer;
+       Name    : String;
+       Index   : Positive)
+   is
+      function smfi_chgheader
+         (ctx     : SMFICTX_Pointer;
+          headerf : char_array;
+          hdridx  : int;
+          headerv : chars_ptr)
+         return int;
+      pragma import(C, smfi_chgheader);
+   begin
+      Check_For_Error("smfi_chgheader",
+                      smfi_chgheader(Context,
+                                     To_C(Name),
+                                     int(Index),
+                                     Null_Ptr));
+   end Delete_Header;
+
+   procedure Insert_Header
+      (Context : SMFICTX_Pointer;
+       Index   : Positive;
+       Name    : String;
+       Value   : String)
+   is
+      function smfi_insheader
+         (ctx     : SMFICTX_Pointer;
+          hdridx  : int;
+          headerf : char_array;
+          headerv : char_array)
+         return int;
+      pragma import(C, smfi_insheader);
+   begin
+      Check_For_Error("smfi_insheader",
+                      smfi_insheader(Context,
+                                     int(Index - 1),
+                                     To_C(Name),
+                                     To_C(Value)));
+   end Insert_Header;
+
+   procedure Add_Recipient(Context : SMFICTX_Pointer; Address : String) is
+      function smfi_addrcpt
+         (ctx  : SMFICTX_Pointer;
+          rcpt : char_array)
+         return int;
+      pragma import(C, smfi_addrcpt);
+   begin
+      Check_For_Error("smfi_addrcpt", smfi_addrcpt(Context, To_C(Address)));
+   end Add_Recipient;
+
+   procedure Delete_Recipient(Context : SMFICTX_Pointer; Address : String) is
+      function smfi_delrcpt
+         (ctx  : SMFICTX_Pointer;
+          rcpt : char_array)
+         return int;
+      pragma import(C, smfi_delrcpt);
+   begin
+      Check_For_Error("smfi_delrcpt", smfi_delrcpt(Context, To_C(Address)));
+   end Delete_Recipient;
+
+   procedure Replace_Body(Context : SMFICTX_Pointer; Data : String) is
+      function smfi_replacebody
+         (ctx     : SMFICTX_Pointer;
+          bodyp   : char_array;
+          bodylen : int)
+         return int;
+      pragma import(C, smfi_replacebody);
+   begin
+      Check_For_Error("smfi_replacebody",
+                      smfi_replacebody(Context,
+                                       To_C(Item => Data, Append_Nul => False),
+                                       Data'Length));
+   end Replace_Body;
+
+
+   procedure Report_Progress(Context : SMFICTX_Pointer) is
+      function smfi_progress(ctx : SMFICTX_Pointer) return int;
+      pragma import(C, smfi_progress);
+   begin
+      Check_For_Error("smfi_progress", smfi_progress(Context));
+   end Report_Progress;
+
+   procedure Quarantine_Message(Context : SMFICTX_Pointer; Reason : String) is
+      function smfi_quarantine
+         (ctx    : SMFICTX_Pointer;
+          reason : char_array)
+         return int;
+      pragma import(C, smfi_quarantine);
+   begin
+      Check_For_Error("smfi_quarantine",
+                      smfi_quarantine(Context, To_C(Reason)));
+   end Quarantine_Message;
+
+
+end Milter_API;
diff --git a/milter_api.ads b/milter_api.ads
new file mode 100644
index 0000000..3e37163
--- /dev/null
+++ b/milter_api.ads
@@ -0,0 +1,427 @@
+-- Milter API for Ada, a binding to Libmilter, the Sendmail mail filtering API
+-- Copyright 2009 B. Persson, Bjorn@Rombobeorn.se
+--
+-- This library is free software: you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License version 3, as published
+-- by the Free Software Foundation.
+
+
+with Ada.Strings.Unbounded;
+with Interfaces.C.Strings;
+with Interfaces.C.Pointers;
+
+package Milter_API is
+
+
+   --
+   -- Version numbers
+   --
+
+   type Binding_Version_Type is record
+      Specification_Major : Positive;
+      Specification_Minor : Positive;
+      Implementation      : Positive;
+   end record;
+
+   function Binding_Version return Binding_Version_Type;
+   -- Binding_Version returns the version of Milter_API that the program is
+   -- linked with. If it is dynamically linked, then this is the version that
+   -- is loaded at run time.
+   -- The fields in the result are:
+   --  · Specification_Major: incremented for each new major version of the
+   --    Milter_API specification (this file).
+   --  · Specification_Minor: incremented when changes are made to the
+   --    specification and the major version number cannot be incremented.
+   --  · Implementation: incremented for each new version of Milter_API
+   --    when the specification is unchanged.
+
+   function Binding_Version_String return String;
+   -- Binding_Version_String returns the same version information as
+   -- Binding_Version, but in string form.
+
+
+   --
+   -- Data types and constants
+   --
+
+   type SMFICTX_Pointer is private;
+   -- SMFICTX_Pointer is the type of the opaque context pointers that Libmilter
+   -- passes to the callback routines, and that these in turn must pass to the
+   -- data access and message handling routines.
+
+   type Milter_Data is limited interface;
+   type Milter_Data_Pointer is access all Milter_Data'Class;
+   pragma Convention(C, Milter_Data_Pointer);
+   -- In order to keep some data between callback invocations, the milter must
+   -- derive a type from Milter_Data and allocate one object of that type for
+   -- each SMTP session. The pointer to that object must be stored with
+   -- Set_Private_Data and retrieved with Private_Data.
+
+   type Action is private;
+   -- Action is returned by callback routines. The value is an instruction to
+   -- the MTA on how to proceed with the message or connection.
+
+   Continue : constant Action;
+   -- Continue processing the message/connection.
+   -- (SMFIS_CONTINUE)
+
+   Reject : constant Action;
+   -- Reject the message/connection.
+   -- No further routines will be called for this message
+   -- (or connection, if returned from a connection-oriented routine).
+   -- (SMFIS_REJECT)
+
+   Discard : constant Action;
+   -- Accept the message,
+   -- but silently discard the message.
+   -- No further routines will be called for this message.
+   -- This is only meaningful from message-oriented routines.
+   -- (SMFIS_DISCARD)
+
+   Accept_Definitely : constant Action;
+   -- Accept the message/connection.
+   -- No further routines will be called for this message
+   -- (or connection, if returned from a connection-oriented routine;
+   -- in this case, it causes all messages on this connection
+   -- to be accepted without filtering).
+   -- (SMFIS_ACCEPT)
+
+   Fail_Temporarily : constant Action;
+   -- Return a temporary failure, i.e.,
+   -- the corresponding SMTP command will return a 4xx status code.
+   -- In some cases this may prevent further routines from
+   -- being called on this message or connection,
+   -- although in other cases (e.g., when processing an envelope
+   -- recipient) processing of the message will continue.
+   -- (SMFIS_TEMPFAIL)
+
+   type Sockaddr is private;
+
+   type Arguments_Handle is private;
+
+   type Unbounded_Strings is
+      array(Positive range <>) of Ada.Strings.Unbounded.Unbounded_String;
+
+
+   --
+   -- Callback types
+   --
+
+   type Connect_Handler is access function
+      (Context        : SMFICTX_Pointer;  -- the opaque context handle
+       Client_Name    : String;           -- the name of the client
+       Client_Address : Sockaddr)         -- the address of the client
+      return Action;
+   -- called at the start of each SMTP connection
+   -- corresponds to xxfi_connect
+   -- Client_Name is the host name of the client, as determined by a reverse
+   -- lookup on the host address. Client_Address describes the client's endpoint
+   -- of the SMTP connection. The means to access the contents of Client_Address
+   -- are not implemented.
+
+   type Helo_Handler is access function
+      (Context     : SMFICTX_Pointer;  -- the opaque context handle
+       Stated_Name : String)           -- what the client sent as parameter to
+                                       -- the HELO or EHLO command
+      return Action;
+   -- called when the client sends a HELO or EHLO command
+   -- corresponds to xxfi_helo
+
+   type Envelope_Sender_Handler is access function
+      (Context   : SMFICTX_Pointer;   -- the opaque context handle
+       Sender    : String;            -- the envelope sender address
+       Arguments : Arguments_Handle)  -- ESMTP arguments to the MAIL command
+      return Action;
+   -- called once at the beginning of each message
+   -- corresponds to xxfi_envfrom
+
+   type Envelope_Recipient_Handler is access function
+      (Context   : SMFICTX_Pointer;   -- the opaque context handle
+       Recipient : String;            -- an envelope recipient address
+       Arguments : Arguments_Handle)  -- ESMTP arguments to the RCPT command
+      return Action;
+   -- called once per recipient
+   -- corresponds to xxfi_envrcpt
+
+   type Data_Handler is access function
+      (Context : SMFICTX_Pointer)  -- the opaque context handle
+      return Action;
+   -- called when the client sends the DATA command
+   -- corresponds to xxfi_data
+
+   type Unknown_Command_Handler is access function
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Command : String)           -- the unknown command including arguments
+      return Action;
+   -- called if the client sends an SMTP command that is either unknown or not
+   -- implemented by the MTA
+   -- corresponds to xxfi_unknown
+
+   type Header_Handler is access function
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Name    : String;           -- the name of the header
+       Value   : String)           -- the content of the header
+      return Action;
+   -- called once per message header
+   -- corresponds to xxfi_header
+
+   type End_Of_Headers_Handler is access function
+      (Context : SMFICTX_Pointer)  -- the opaque context handle
+      return Action;
+   -- called after all headers have been processed
+   -- corresponds to xxfi_eoh
+
+   type Body_Handler is access function
+      (Context    : SMFICTX_Pointer;  -- the opaque context handle
+       Body_Chunk : String)           -- a piece of the message body
+      return Action;
+   -- called zero or more times between End_Of_Headers_Handler and
+   -- End_Of_Message_Handler
+   -- corresponds to xxfi_body
+
+   type End_Of_Message_Handler is access function
+      (Context : SMFICTX_Pointer)  -- the opaque context handle
+      return Action;
+   -- called at the end of a message
+   -- This is the place to call message modification procedures.
+   -- corresponds to xxfi_eom
+
+   type Abort_Handler is access procedure
+      (Context : SMFICTX_Pointer);  -- the opaque context handle
+   -- called at any time during message processing if the message is aborted
+   -- corresponds to xxfi_abort
+
+   type Close_Handler is access procedure
+      (Context : SMFICTX_Pointer);  -- the opaque context handle
+   -- called once at the end of each connection
+   -- corresponds to xxfi_close
+
+
+   --
+   -- Exceptions
+   --
+
+   Failure : exception;
+   -- A call to an API procedure failed.
+   -- (The corresponding C function returned MI_FAILURE.)
+
+   Unknown_Error : exception;
+   -- A C function returned an undocumented result code.
+
+
+   --
+   -- Library control procedures
+   --
+
+   procedure Register
+      (Name                              : String;
+       Connected                         : Connect_Handler            := null;
+       Helo                              : Helo_Handler               := null;
+       Envelope_Sender                   : Envelope_Sender_Handler    := null;
+       Envelope_Recipient                : Envelope_Recipient_Handler := null;
+       Data                              : Data_Handler               := null;
+       Unknown_Command                   : Unknown_Command_Handler    := null;
+       Header                            : Header_Handler             := null;
+       End_Of_Headers                    : End_Of_Headers_Handler     := null;
+       Body_Chunk                        : Body_Handler               := null;
+       End_Of_Message                    : End_Of_Message_Handler     := null;
+       Aborted                           : Abort_Handler              := null;
+       Closed                            : Close_Handler              := null;
+       May_Add_Headers                   : Boolean                    := False;
+       May_Change_Or_Delete_Headers      : Boolean                    := False;
+       May_Replace_Body                  : Boolean                    := False;
+       May_Add_Recepients                : Boolean                    := False;
+       May_Remove_Recepients             : Boolean                    := False;
+       May_Quarantine                    : Boolean                    := False);
+   -- Register must be called exactly once before Main. It registers the
+   -- callbacks and properties of the milter (calls smfi_register).
+
+   procedure Set_Timeout(Timeout : Natural);
+   -- Set_Timeout should only be called before Main. It sets the number of
+   -- seconds Libmilter will wait for an MTA connection before timing out a
+   -- socket (calls smfi_settimeout).
+
+   procedure Set_Connection_Queue_Length(Length : Positive);
+   -- Set_Connection_Queue_Length should only be called before Main. It
+   -- sets the number of incoming connections to allow in the listen queue
+   -- (calls smfi_setbacklog).
+
+   procedure Set_Socket(Address : String);
+   -- Set_Socket must be called once before Main. It specifies the socket
+   -- through which the milter should communicate with the MTA (calls
+   -- smfi_setconn).
+
+   procedure Open_Socket(Remove_Old_Socket : Boolean);
+   -- Open_Socket should only be called before Main. It creates the socket
+   -- specified previously by a call to Set_Socket (calls smfi_opensocket).
+   -- This allows the calling application to ensure that the socket can be
+   -- created. If the socket is specified as a Unix domain socket and
+   -- Remove_Old_Socket is true, then Libmilter will try to remove any existing
+   -- socket before creating a new one.
+   -- If Open_Socket is not called, then Main will create the socket.
+
+   procedure Main;
+   -- Hands control to the Libmilter event loop (calls smfi_main).
+
+   procedure Set_Debug_Level(Level : Natural);
+   -- Set_Debug_Level may be called from any routine at any time. It changes
+   -- Libmilter's internal debug logging level (calls smfi_setdbg). A value of
+   -- zero turns off debug logging. The greater the value the more detailed the
+   -- logging.
+
+   procedure Stop;
+   -- Stop may be called from any of the callback routines or any error-handling
+   -- routines at any time. It tells Libmilter to shut down the milter (calls
+   -- smfi_stop).
+
+
+   --
+   -- Data access subprograms
+   --
+
+   function Arguments(Handle : Arguments_Handle) return Unbounded_Strings;
+   -- Converts the ESMTP arguments to a MAIL or RCPT command into an array of
+   -- unbounded strings.
+
+   procedure Get_Symbol_Value
+      (Context : in  SMFICTX_Pointer;  -- the opaque context handle
+       Name    : in  String;           -- the name of the requested symbol
+       Defined : out Boolean;          -- whether the requested symbol exists
+       Value   : out Ada.Strings.Unbounded.Unbounded_String);
+   -- Requests the value of a symbol ("macro") from the MTA. Value is
+   -- meaningful only if Defined is True.
+
+   procedure Set_Private_Data
+      (Context : SMFICTX_Pointer;       -- the opaque context handle
+       Data    : Milter_Data_Pointer);  -- pointer to private data
+   -- Sets the private data pointer to be returned by future calls to
+   -- Private_Data for this connection (calls smfi_setpriv).
+
+   function Private_Data
+      (Context : SMFICTX_Pointer)  -- the opaque context handle
+      return Milter_Data_Pointer;
+   -- Retrieves the private data pointer previously stored with Set_Private_Data
+   -- for this connection (calls smfi_getpriv).
+
+   subtype String_Of_Three is String(1..3);
+   procedure Set_Reply
+      (Context       : SMFICTX_Pointer;  -- the opaque context handle
+       Reply_Code    : String_Of_Three;  -- three-digit (RFC 2821) reply code
+       Extended_Code : String := "";     -- extended (RFC 2034) reply code
+       Message       : String := "");    -- the text part of the reply
+   -- Sets the reply codes and message to be used in subsequent SMTP error
+   -- replies caused by the milter (calls smfi_setreply).
+   -- There is no interface to smfi_setmlreply yet.
+
+
+   --
+   -- Message modification procedures
+   --
+   -- These procedures may only be called from a callback function registered as
+   -- End_Of_Message.
+
+   procedure Add_Header
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Name    : String;           -- the header field name
+       Value   : String);          -- the header field body
+   -- Adds a header field to the current message (calls smfi_addheader).
+
+   procedure Change_Header
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Name    : String;           -- the header field name
+       Index   : Positive;         -- index among headers with the same name
+       Value   : String);          -- the new header field body
+   -- Replaces the header field body of the specified header field in the
+   -- current message (calls smfi_chgheader). Index specifies which of the
+   -- headers with the name Name shall be changed.
+
+   procedure Delete_Header
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Name    : String;           -- the header field name
+       Index   : Positive);        -- index among headers with the same name
+   -- Removes the specified header field from the current message (calls
+   -- smfi_chgheader with headerv set to null).
+
+   procedure Insert_Header
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Index   : Positive;         -- index among all headers
+       Name    : String;           -- the header field name
+       Value   : String);          -- the header field body
+   -- Adds a header field at a specified position in the current message
+   -- (calls smfi_insheader). Index specifies where in the list of headers it
+   -- shall be inserted. 1 makes it the first header, 2 the second and so on.
+
+   procedure Add_Recipient
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Address : String);          -- the new recipient's address
+   -- Adds a recepient address to the envelope of the current message (calls
+   -- smfi_addrcpt).
+
+   procedure Delete_Recipient
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Address : String);          -- the recipient address to be removed
+   -- Removes the specified recepient address from the envelope of the current
+   -- message (calls smfi_delrcpt).
+
+   procedure Replace_Body
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Data    : String);          -- the new message body
+   -- Replaces the body of the current message (calls smfi_replacebody). If
+   -- called more than once, subsequent calls append data to the new body.
+
+
+   --
+   -- Other message handling procedures
+   --
+   -- These procedures may only be called from a callback function registered as
+   -- End_Of_Message.
+
+   procedure Report_Progress
+      (Context : SMFICTX_Pointer);  -- the opaque context handle
+   -- Notifies the MTA that the milter is still working on a message (calls
+   -- smfi_progress).
+
+   procedure Quarantine_Message
+      (Context : SMFICTX_Pointer;  -- the opaque context handle
+       Reason  : String);          -- the quarantine reason
+   -- Quarantines the current message (calls smfi_quarantine).
+
+
+private
+
+   type Dummy_Type is null record;
+   type SMFICTX_Pointer is access Dummy_Type;
+   pragma convention(C, Dummy_Type);
+   pragma convention(C, SMFICTX_Pointer);
+
+   type Action is range 0 .. 10;
+   Continue          : constant Action := 0;
+   Reject            : constant Action := 1;
+   Discard           : constant Action := 2;
+   Accept_Definitely : constant Action := 3;
+   Fail_Temporarily  : constant Action := 4;
+   All_Options       : constant Action := 10;
+
+   type Sockaddr is null record;
+   -- Accessing socket addresses isn't implemented. The type is declared just
+   -- so that there's a chance that the API will be compatible if this gets
+   -- implemented in the future.
+
+   use Interfaces.C;
+   use Interfaces.C.Strings;
+
+   type chars_ptr_array is array(size_t range <>) of aliased chars_ptr;
+   -- This type definition can be removed if and when Interfaces.C.Strings gets
+   -- updated to conform to Ada 2005.
+
+   package String_Arrays is
+      new Interfaces.C.Pointers(Index              => size_t,
+                                Element            => chars_ptr,
+                                Element_Array      => chars_ptr_array,
+                                Default_Terminator => Null_Ptr);
+
+   type Arguments_Handle is record
+      Pointer : String_Arrays.Pointer;
+   end record;
+
+end Milter_API;