File 3252-ftp-create-internal-typed-api.patch of Package erlang

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File 3252-ftp-create-internal-typed-api.patch of Package erlang (Revision 44321c08784c0bcdc6b5f65725943eda)

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From 8122362e060919ea73d276b03ae78702adbf9220 Mon Sep 17 00:00:00 2001
From: Kiko Fernandez-Reyes <kiko@erlang.org>
Date: Fri, 17 Feb 2023 15:13:57 +0100
Subject: [PATCH 2/2] ftp: create internal typed api

removes some type information from module `ftp.erl` because this
information should not be needed by users of `ftp`.

before this change, users of `ftp` module knew that if they get an error
as follows `{error, Reason}`, `Reason` was a specific atom(), i.e.,
`Reason :: 'ehost' | ...`. users of `ftp` should not rely on the
internal atom used, since they are expected to call `ftp:formaterror/1` to
understand the reason behind the error, as in any other OTP app.

however, this type information can be useful to maintainers of OTP.
Thus, `ftp.erl` contains the necessary type information for users of the
ftp application. the new module `ftp_internal.erl` has been introduced and
contains the actual implementation of the functions from `ftp.erl`, so that
`ftp.erl` is now a simple wrapper around `ftp_internal.erl`.

`ftp_internal.erl` contains the more precise error types for the type
variable `Reason` and also contains the implementation of the `ftp`
functions.
---
 lib/ftp/src/Makefile         |    1 +
 lib/ftp/src/ftp.app.src      |    1 +
 lib/ftp/src/ftp.erl          | 2372 ++------------------------------
 lib/ftp/src/ftp_internal.erl | 2467 ++++++++++++++++++++++++++++++++++
 lib/ftp/src/ftp_sup.erl      |    2 +-
 lib/ftp/test/ftp_SUITE.erl   |    4 +-
 6 files changed, 2582 insertions(+), 2265 deletions(-)
 create mode 100644 lib/ftp/src/ftp_internal.erl

diff --git a/lib/ftp/src/Makefile b/lib/ftp/src/Makefile
index 7f18498b13..ee59f5675c 100644
--- a/lib/ftp/src/Makefile
+++ b/lib/ftp/src/Makefile
@@ -42,6 +42,7 @@ BEHAVIOUR_MODULES=
 
 MODULES= \
 	ftp \
+	ftp_internal \
 	ftp_app \
 	ftp_progress \
 	ftp_response \
diff --git a/lib/ftp/src/ftp.app.src b/lib/ftp/src/ftp.app.src
index 1592e7dafa..88b194f5b5 100644
--- a/lib/ftp/src/ftp.app.src
+++ b/lib/ftp/src/ftp.app.src
@@ -12,6 +12,7 @@
              ftp,
              ftp_app,
              ftp_progress,
+             ftp_internal,
              ftp_response,
              ftp_sup
             ]},
diff --git a/lib/ftp/src/ftp.erl b/lib/ftp/src/ftp.erl
index 07bc5184e2..6071ce7705 100644
--- a/lib/ftp/src/ftp.erl
+++ b/lib/ftp/src/ftp.erl
@@ -21,8 +21,6 @@
 
 -module(ftp).
 
--behaviour(gen_server).
-
 -deprecated([{start_service, 1, "use ftp:open/2 instead"},
              {stop_service, 1,  "use ftp:close/1 instead"}]).
 
@@ -32,8 +30,6 @@
          stop_service/1
         ]).
 
--export([start_link/1, start_link/2]).
-
 %%  API - Client interface
 -export([cd/2, close/1, delete/2, formaterror/1,
          lcd/2, lpwd/1, ls/1, ls/2,
@@ -50,83 +46,8 @@
          append_chunk/2, append_chunk_end/1, append_chunk_start/2,
          info/1, latest_ctrl_response/1]).
 
-%% gen_server callbacks
--export([init/1, handle_call/3, handle_cast/2,
-         handle_info/2, terminate/2, code_change/3]).
-
 -include("ftp_internal.hrl").
 
-%% Constants used in internal state definition
--define(CONNECTION_TIMEOUT,  60*1000).
--define(DATA_ACCEPT_TIMEOUT, infinity).
--define(DEFAULT_MODE,        passive).
--define(PROGRESS_DEFAULT,    ignore).
--define(FTP_EXT_DEFAULT,     false).
-
-%% Internal Constants
--define(FTP_PORT, 21).
--define(FTPS_PORT, 990).
--define(FILE_BUFSIZE, 4096).
-
-
-%%%=========================================================================
-%%%  Data Types
-%%%=========================================================================
-
-%% Internal state
--record(state, {
-          csock   = undefined, % socket() - Control connection socket
-          dsock   = undefined, % socket() - Data connection socket
-          tls_options = undefined, % list()
-          verbose = false, % boolean()
-          ldir    = undefined, % string() - Current local directory
-          type    = ftp_server_default, % atom() - binary | ascii
-          chunk   = false, % boolean() - Receiving data chunks
-          mode    = ?DEFAULT_MODE, % passive | active
-          timeout = ?CONNECTION_TIMEOUT, % integer()
-          %% Data received so far on the data connection
-          data    = <<>>, % binary()
-          %% Data received so far on the control connection
-          %% {BinStream, AccLines}. If a binary sequence
-          %% ends with ?CR then keep it in the binary to
-          %% be able to detect if the next received byte is ?LF
-          %% and hence the end of the response is reached!
-          ctrl_data = {<<>>, [], start}, % {binary(), [bytes()], LineStatus}
-          %% pid() - Client pid (note not the same as "From")
-          latest_ctrl_response = "",
-          owner = undefined,
-          client = undefined, % "From" to be used in gen_server:reply/2
-          %% Function that activated a connection and maybe some
-          %% data needed further on.
-          caller = undefined, % term()
-          ipfamily, % inet | inet6 | inet6fb4
-          sockopts_ctrl = [],
-          sockopts_data_passive = [],
-          sockopts_data_active = [],
-          progress = ignore, % ignore | pid()
-          dtimeout = ?DATA_ACCEPT_TIMEOUT, % non_neg_integer() | infinity
-          tls_ctrl_session_reuse = false, % boolean()
-          tls_upgrading_data_connection = false,
-          ftp_extension = ?FTP_EXT_DEFAULT
-         }).
-
--record(recv_chunk_closing, {
-          dconn_closed = false,
-          pos_compl_received = false,
-          client_called_us = false
-         }).
-
-
--type shortage_reason()  :: 'etnospc' | 'epnospc'.
--type restriction_reason() :: 'epath' | 'efnamena' | 'elogin' | 'enotbinary'.
--type common_reason() ::  'econn' | 'eclosed' | term().
--type file_write_error_reason() :: term(). % See file:write for more info
-
--define(DBG(F,A), 'n/a').
-%%-define(DBG(F,A), io:format(F,A)).
-%%-define(DBG(F,A), ct:pal("~p:~p " ++ if is_list(F) -> F; is_atom(F) -> atom_to_list(F) end, [?MODULE,?LINE|A])).
-
-
 %%%=========================================================================
 %%%  API
 %%%=========================================================================
@@ -138,23 +59,19 @@ start() ->
 %% ftp client processes should always be part of ftp supervisor tree.
 %% We consider it a bug that the "standalone" concept of inets was 
 %% not removed when ftp was broken out, and it is now fixed.
+-spec start_service(ServiceConfig) -> {ok, Pid} | {error, Reason} when
+      ServiceConfig :: [{Property, Value}],
+      Property :: proplists:property(),
+      Value :: term(),
+      Pid :: pid(),
+      Reason :: term().
 start_service(Options) ->
-    try
-        {ok, StartOptions} = start_options(Options),
-        case ftp_sup:start_child([[[{client, self()} | StartOptions], []]]) of
-            {ok, Pid} ->
-                call(Pid, {open, ip_comm, Options}, plain);
-            Error1 ->
-                Error1
-        end
-    catch
-        throw:Error2 ->
-            Error2
-    end.
+    ftp_internal:start_service(Options).
 
 stop() ->
     application:stop(ftp).
 
+-spec stop_service(Pid :: pid() | term()) -> ok.
 stop_service(Pid) ->
     close(Pid).
 
@@ -163,17 +80,11 @@ stop_service(Pid) ->
 %%%=========================================================================
 
 %%--------------------------------------------------------------------------
-%% open(HostOrOtpList, <Port>, <Flags>) -> {ok, Pid} | {error, ehost}
-%%        HostOrOtpList = string() | [{option_list, Options}]
-%%      Port = integer(),
-%%      Flags = [Flag],
-%%      Flag = verbose | debug | trace
-%%
 %% Description:  Start an ftp client and connect to a host.
 %%--------------------------------------------------------------------------
 
 -spec open(Host :: string() | inet:ip_address()) ->
-    {'ok', Pid :: pid()} | {'error', Reason :: 'ehost' | term()}.
+    {'ok', Pid :: pid()} | {'error', Reason :: term()}.
 
 %% <BACKWARD-COMPATIBILLITY>
 open({option_list, Options}) when is_list(Options) ->
@@ -181,96 +92,74 @@ open({option_list, Options}) when is_list(Options) ->
 %% </BACKWARD-COMPATIBILLITY>
 
 open(Host) ->
-    open(Host, []).
-
--spec open(Host :: string() | inet:ip_address(), Opts :: list()) ->
-    {'ok', Pid :: pid()} | {'error', Reason :: 'ehost' | term()}.
-
-%% <BACKWARD-COMPATIBILLITY>
-open(Host, Port) when is_integer(Port) ->
-    open(Host, [{port, Port}]);
-%% </BACKWARD-COMPATIBILLITY>
-
-open(Host, Options) when is_list(Options) ->
-    start_service([{host,Host}|Options]).
+  ftp_internal:open(Host).
+
+
+-spec open(Host :: string() | inet:ip_address(), Opts) ->
+    {'ok', Pid :: pid()} | {'error', Reason :: term()} when
+      Opts :: [Opt],
+      Opt :: StartOption | OpenOption,
+      StartOption :: {verbose, Verbose} | {debug, Debug},
+      Verbose :: boolean(),
+      Debug :: disable | debug | trace,
+      OpenOption :: {ipfamily, IpFamily} | {port, Port :: port()} | {mode, Mode}
+                    | {tls, TLSOptions :: [ssl:tls_option()]} | {tls_sec_method, TLSSecMethod :: ftps | ftpes}
+                    | {tls_ctrl_session_reuse, TLSSessionReuse :: boolean() } | {timeout, Timeout :: timeout()}
+                    | {dtimeout, DTimeout :: timeout()} | {progress, Progress} | {sock_ctrl, SocketCtrls}
+                    | {sock_data_act, [SocketControl]} | {sock_data_pass, [SocketControl]},
+      SocketCtrls :: [SocketControl],
+      IpFamily :: inet | inet6 | inet6fb4,
+      Mode :: active | passive,
+      Module :: atom(),
+      Function :: atom(),
+      InitialData :: term(),
+      Progress :: ignore | {Module, Function, InitialData},
+      SocketControl :: gen_tcp:option().
+open(Host, Port) ->
+    ftp_internal:open(Host, Port).
 
 %%--------------------------------------------------------------------------
-%% user(Pid, User, Pass, <Acc>) -> ok | {error, euser} | {error, econn}
-%%                                    | {error, eacct}
-%%        Pid = pid(),
-%%      User = Pass =  Acc = string()
-%%
 %% Description:  Login with or without a supplied account name.
 %%--------------------------------------------------------------------------
 -spec user(Pid  :: pid(),
            User :: string(),
            Pass :: string()) ->
-    'ok' | {'error', Reason :: 'euser' | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 user(Pid, User, Pass) ->
-    case {is_name_sane(User), is_name_sane(Pass)} of
-        {true, true} ->
-            call(Pid, {user, User, Pass}, atom);
-        _ ->
-            {error, euser}
-    end.
+    ftp_internal:user(Pid, User, Pass).
 
 -spec user(Pid  :: pid(),
            User :: string(),
            Pass :: string(),
-           Acc  :: string()) ->
-    'ok' | {'error', Reason :: 'euser' | common_reason()}.
-
-user(Pid, User, Pass, Acc) ->
-    case {is_name_sane(User), is_name_sane(Pass), is_name_sane(Acc)} of
-        {true, true, true} ->
-            call(Pid, {user, User, Pass, Acc}, atom);
-        _ ->
-            {error, euser}
-    end.
+           Account  :: string()) ->
+    'ok' | {'error', Reason :: term()}.
 
+user(Pid, User, Pass, Account) ->
+    ftp_internal:user(Pid, User, Pass, Account).
 
 %%--------------------------------------------------------------------------
-%% account(Pid, Acc)  -> ok | {error, eacct}
-%%        Pid = pid()
-%%        Acc= string()
-%%
 %% Description:  Set a user Account.
 %%--------------------------------------------------------------------------
 
 -spec account(Pid :: pid(), Acc :: string()) ->
-    'ok' | {'error', Reason :: 'eacct' | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 account(Pid, Acc) ->
-    case is_name_sane(Acc) of
-        true ->
-            call(Pid, {account, Acc}, atom);
-        _ ->
-            {error, eacct}
-    end.
-
+    ftp_internal:account(Pid, Acc).
 
 %%--------------------------------------------------------------------------
-%% pwd(Pid) -> {ok, Dir} | {error, elogin} | {error, econn}
-%%        Pid = pid()
-%%      Dir = string()
-%%
 %% Description:  Get the current working directory at remote server.
 %%--------------------------------------------------------------------------
 
 -spec pwd(Pid :: pid()) ->
     {'ok', Dir :: string()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+        {'error', Reason :: term()}.
 
 pwd(Pid) ->
-    call(Pid, pwd, ctrl).
-
+    ftp_internal:pwd(Pid).
 
 %%--------------------------------------------------------------------------
-%% lpwd(Pid) ->  {ok, Dir}
-%%        Pid = pid()
-%%      Dir = string()
-%%
 %% Description:  Get the current working directory at local server.
 %%--------------------------------------------------------------------------
 
@@ -278,317 +167,179 @@ pwd(Pid) ->
     {'ok', Dir :: string()}.
 
 lpwd(Pid) ->
-    call(Pid, lpwd, string).
+    ftp_internal:lpwd(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% cd(Pid, Dir) ->  ok | {error, epath} | {error, elogin} | {error, econn}
-%%        Pid = pid()
-%%        Dir = string()
-%%
 %% Description:  Change current working directory at remote server.
 %%--------------------------------------------------------------------------
 
 -spec cd(Pid :: pid(), Dir :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 cd(Pid, Dir) ->
-    case is_name_sane(Dir) of
-        true ->
-            call(Pid, {cd, Dir}, atom);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:cd(Pid, Dir).
 
 %%--------------------------------------------------------------------------
-%% lcd(Pid, Dir) ->  ok | {error, epath}
-%%        Pid = pid()
-%%        Dir = string()
-%%
 %% Description:  Change current working directory for the local client.
 %%--------------------------------------------------------------------------
 
 -spec lcd(Pid :: pid(), Dir :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 lcd(Pid, Dir) ->
-    call(Pid, {lcd, Dir}, string).
-
+    ftp_internal:lcd(Pid, Dir).
 
 %%--------------------------------------------------------------------------
-%% ls(Pid) -> Result
-%% ls(Pid, <Dir>) -> Result
-%%
-%%        Pid = pid()
-%%        Dir = string()
-%%      Result = {ok, Listing} | {error, Reason}
-%%      Listing = string()
-%%      Reason = epath | elogin | econn
-%%
 %% Description: Returns a list of files in long format.
 %%--------------------------------------------------------------------------
 
 -spec ls(Pid :: pid()) ->
     {'ok', Listing :: string()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+        {'error', Reason :: term()}.
 
 ls(Pid) ->
   ls(Pid, "").
 
 -spec ls(Pid :: pid(), Dir :: string()) ->
     {'ok', Listing :: string()} |
-        {'error', Reason ::  restriction_reason() | common_reason()}.
+        {'error', Reason ::  term()}.
 
 ls(Pid, Dir) ->
-    case is_name_sane(Dir) of
-        true ->
-            call(Pid, {dir, long, Dir}, string);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:ls(Pid, Dir).
 
 
 %%--------------------------------------------------------------------------
-%% nlist(Pid) -> Result
-%% nlist(Pid, Pathname) -> Result
-%%
-%%        Pid = pid()
-%%        Pathname = string()
-%%      Result = {ok, Listing} | {error, Reason}
-%%      Listing = string()
-%%      Reason = epath | elogin | econn
-%%
 %% Description:  Returns a list of files in short format
 %%--------------------------------------------------------------------------
 
 -spec nlist(Pid :: pid()) ->
     {'ok', Listing :: string()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+        {'error', Reason :: term()}.
 
 nlist(Pid) ->
   nlist(Pid, "").
 
 -spec nlist(Pid :: pid(), Pathname :: string()) ->
     {'ok', Listing :: string()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+        {'error', Reason :: term()}.
 
 nlist(Pid, Dir) ->
-    case is_name_sane(Dir) of
-        true ->
-            call(Pid, {dir, short, Dir}, string);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:nlist(Pid, Dir).
 
 %%--------------------------------------------------------------------------
-%% rename(Pid, Old, New) ->  ok | {error, epath} | {error, elogin}
-%%                              | {error, econn}
-%%        Pid = pid()
-%%        CurrFile = NewFile = string()
-%%
 %% Description:  Rename a file at remote server.
 %%--------------------------------------------------------------------------
 
 -spec rename(Pid :: pid(), Old :: string(), New :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 rename(Pid, Old, New) ->
-    case {is_name_sane(Old), is_name_sane(New)} of
-        {true, true} ->
-            call(Pid, {rename, Old, New}, string);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:rename(Pid, Old, New).
 
 %%--------------------------------------------------------------------------
-%% delete(Pid, File) ->  ok | {error, epath} | {error, elogin} |
-%%                       {error, econn}
-%%        Pid = pid()
-%%        File = string()
-%%
 %% Description:  Remove file at remote server.
 %%--------------------------------------------------------------------------
 
 -spec delete(Pid :: pid(), File :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 delete(Pid, File) ->
-    case is_name_sane(File) of
-        true ->
-            call(Pid, {delete, File}, string);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:delete(Pid, File).
 
 %%--------------------------------------------------------------------------
-%% mkdir(Pid, Dir) -> ok | {error, epath} | {error, elogin} | {error, econn}
-%%        Pid = pid(),
-%%        Dir = string()
-%%
 %% Description:  Make directory at remote server.
 %%--------------------------------------------------------------------------
 
 -spec mkdir(Pid :: pid(), Dir :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 mkdir(Pid, Dir) ->
-    case is_name_sane(Dir) of
-        true ->
-            call(Pid, {mkdir, Dir}, atom);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:mkdir(Pid, Dir).
 
 %%--------------------------------------------------------------------------
-%% rmdir(Pid, Dir) -> ok | {error, epath} | {error, elogin} | {error, econn}
-%%        Pid = pid(),
-%%        Dir = string()
-%%
 %% Description:  Remove directory at remote server.
 %%--------------------------------------------------------------------------
 
 -spec rmdir(Pid :: pid(), Dir :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 rmdir(Pid, Dir) ->
-    case is_name_sane(Dir) of
-        true ->
-            call(Pid, {rmdir, Dir}, atom);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:rmdir(Pid, Dir).
 
 %%--------------------------------------------------------------------------
-%% type(Pid, Type) -> ok | {error, etype} | {error, elogin} | {error, econn}
-%%        Pid = pid()
-%%        Type = ascii | binary
-%%
 %% Description:  Set transfer type.
 %%--------------------------------------------------------------------------
 
 -spec type(Pid :: pid(), Type :: ascii | binary) ->
-    'ok' |
-        {'error', Reason :: 'etype' | restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 type(Pid, Type) ->
-    call(Pid, {type, Type}, atom).
+    ftp_internal:type(Pid, Type).
 
 
 %%--------------------------------------------------------------------------
-%% recv(Pid, RemoteFileName [, LocalFileName]) -> ok | {error, epath} |
-%%                                          {error, elogin} | {error, econn}
-%%        Pid = pid()
-%%        RemoteFileName = LocalFileName = string()
-%%
 %% Description:  Transfer file from remote server.
 %%--------------------------------------------------------------------------
 
 -spec recv(Pid :: pid(), RemoteFileName :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() |
-                               common_reason() |
-                               file_write_error_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
-recv(Pid, RemotFileName) ->
-  recv(Pid, RemotFileName, RemotFileName).
+recv(Pid, RemoteFileName) ->
+  ftp_internal:recv(Pid, RemoteFileName).
 
 -spec recv(Pid            :: pid(),
            RemoteFileName :: string(),
            LocalFileName  :: string()) ->
     'ok' | {'error', Reason :: term()}.
 
-recv(Pid, RemotFileName, LocalFileName) ->
-    case is_name_sane(RemotFileName) of
-        true ->
-            call(Pid, {recv, RemotFileName, LocalFileName}, atom);
-        _ ->
-            {error, efnamena}
-    end.
+recv(Pid, RemoteFileName, LocalFileName) ->
+    ftp_internal:recv(Pid, RemoteFileName, LocalFileName).
 
 
 %%--------------------------------------------------------------------------
-%% recv_bin(Pid, RemoteFile) -> {ok, Bin} | {error, epath} | {error, elogin}
-%%                           | {error, econn}
-%%        Pid = pid()
-%%        RemoteFile = string()
-%%      Bin = binary()
-%%
 %% Description:  Transfer file from remote server into binary.
 %%--------------------------------------------------------------------------
 
 -spec recv_bin(Pid        :: pid(),
                RemoteFile :: string()) ->
-    {'ok', Bin :: binary()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+    {'ok', Bin :: binary()} | {'error', Reason :: term()}.
 
 recv_bin(Pid, RemoteFile) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {recv_bin, RemoteFile}, bin);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:recv_bin(Pid, RemoteFile).
 
 
 %%--------------------------------------------------------------------------
-%% recv_chunk_start(Pid, RemoteFile) -> ok | {error, elogin} | {error, epath}
-%%                                 | {error, econn}
-%%        Pid = pid()
-%%        RemoteFile = string()
-%%
 %% Description:  Start receive of chunks of remote file.
 %%--------------------------------------------------------------------------
 
 -spec recv_chunk_start(Pid        :: pid(),
                        RemoteFile :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 recv_chunk_start(Pid, RemoteFile) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {recv_chunk_start, RemoteFile}, atom);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:recv_chunk_start(Pid, RemoteFile).
 
 
 %%--------------------------------------------------------------------------
-%% recv_chunk(Pid, RemoteFile) ->  ok | {ok, Bin} | {error, Reason}
-%%        Pid = pid()
-%%        RemoteFile = string()
-%%
 %% Description:  Transfer file from remote server into binary in chunks
 %%--------------------------------------------------------------------------
 
 -spec recv_chunk(Pid :: pid()) ->
     'ok' |
         {'ok', Bin :: binary()} |
-        {'error', Reason :: restriction_reason() | common_reason()}.
+        {'error', Reason :: term()}.
 
 recv_chunk(Pid) ->
-    call(Pid, recv_chunk, atom).
+    ftp_internal:recv_chunk(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% send(Pid, LocalFileName [, RemotFileName]) -> ok | {error, epath}
-%%                                                  | {error, elogin}
-%%                                                  | {error, econn}
-%%        Pid = pid()
-%%        LocalFileName = RemotFileName = string()
-%%
 %% Description:  Transfer file to remote server.
 %%--------------------------------------------------------------------------
 
 -spec send(Pid :: pid(), LocalFileName :: string()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 send(Pid, LocalFileName) ->
   send(Pid, LocalFileName, LocalFileName).
@@ -596,74 +347,34 @@ send(Pid, LocalFileName) ->
 -spec send(Pid            :: pid(),
            LocalFileName  :: string(),
            RemoteFileName :: string()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 send(Pid, LocalFileName, RemotFileName) ->
-    case is_name_sane(RemotFileName) of
-        true ->
-            call(Pid, {send, LocalFileName, RemotFileName}, atom);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:send(Pid, LocalFileName, RemotFileName).
 
 
 %%--------------------------------------------------------------------------
-%% send_bin(Pid, Bin, RemoteFile) -> ok | {error, epath} | {error, elogin}
-%%                             | {error, enotbinary} | {error, econn}
-%%        Pid = pid()
-%%        Bin = binary()
-%%        RemoteFile = string()
-%%
 %% Description:  Transfer a binary to a remote file.
 %%--------------------------------------------------------------------------
 
 -spec send_bin(Pid :: pid(), Bin :: binary(), RemoteFile :: string()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
-
-send_bin(Pid, Bin, RemoteFile) when is_binary(Bin) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {send_bin, Bin, RemoteFile}, atom);
-        _ ->
-            {error, efnamena}
-    end;
-send_bin(_Pid, _Bin, _RemoteFile) ->
-  {error, enotbinary}.
-
-
-%%--------------------------------------------------------------------------
-%% send_chunk_start(Pid, RemoteFile) -> ok | {error, elogin} | {error, epath}
-%%                                 | {error, econn}
-%%        Pid = pid()
-%%        RemoteFile = string()
-%%
+    'ok' | {'error', Reason :: term()}.
+
+send_bin(Pid, Bin, RemoteFile) ->
+    ftp_internal:send_bin(Pid, Bin, RemoteFile).
+
+
+%%--------------------------------------------------------------------------
 %% Description:  Start transfer of chunks to remote file.
 %%--------------------------------------------------------------------------
 
 -spec send_chunk_start(Pid :: pid(), RemoteFile :: string()) ->
-    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 send_chunk_start(Pid, RemoteFile) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {send_chunk_start, RemoteFile}, atom);
-        _ ->
-            {error, efnamena}
-    end.
-
+    ftp_internal:send_chunk_start(Pid, RemoteFile).
 
 %%--------------------------------------------------------------------------
-%% append_chunk_start(Pid, RemoteFile) -> ok | {error, elogin} |
-%%                                        {error, epath} | {error, econn}
-%%        Pid = pid()
-%%        RemoteFile = string()
-%%
 %% Description:  Start append chunks of data to remote file.
 %%--------------------------------------------------------------------------
 
@@ -671,109 +382,58 @@ send_chunk_start(Pid, RemoteFile) ->
     'ok' | {'error', Reason :: term()}.
 
 append_chunk_start(Pid, RemoteFile) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {append_chunk_start, RemoteFile}, atom);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:append_chunk_start(Pid, RemoteFile).
 
 
 %%--------------------------------------------------------------------------
-%% send_chunk(Pid, Bin) -> ok | {error, elogin} | {error, enotbinary}
-%%                       | {error, echunk} | {error, econn}
-%%      Pid = pid()
-%%        Bin = binary().
-%%
 %% Purpose:  Send chunk to remote file.
 %%--------------------------------------------------------------------------
 
 -spec send_chunk(Pid :: pid(), Bin :: binary()) ->
-    'ok' |
-        {'error', Reason :: 'echunk' |
-                            restriction_reason() |
-                            common_reason()}.
-
-send_chunk(Pid, Bin) when is_binary(Bin) ->
-    call(Pid, {transfer_chunk, Bin}, atom);
-send_chunk(_Pid, _Bin) ->
-  {error, enotbinary}.
+    'ok' | {'error', Reason :: term()}.
 
+send_chunk(Pid, Bin) ->
+    ftp_internal:send_chunk(Pid, Bin).
 
 %%--------------------------------------------------------------------------
-%% append_chunk(Pid, Bin) -> ok | {error, elogin} | {error, enotbinary}
-%%                             | {error, echunk} | {error, econn}
-%%        Pid = pid()
-%%        Bin = binary()
-%%
 %% Description:  Append chunk to remote file.
 %%--------------------------------------------------------------------------
 
 -spec append_chunk(Pid :: pid(), Bin :: binary()) ->
-    'ok' |
-        {'error', Reason :: 'echunk' |
-                            restriction_reason() |
-                            common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
-append_chunk(Pid, Bin) when is_binary(Bin) ->
-    call(Pid, {transfer_chunk, Bin}, atom);
-append_chunk(_Pid, _Bin) ->
-  {error, enotbinary}.
+append_chunk(Pid, Bin) ->
+    ftp_internal:append_chunk(Pid, Bin).
 
 
 %%--------------------------------------------------------------------------
-%% send_chunk_end(Pid) -> ok | {error, elogin} | {error, echunk}
-%%                          | {error, econn}
-%%        Pid = pid()
-%%
 %% Description:  End sending of chunks to remote file.
 %%--------------------------------------------------------------------------
 
 -spec send_chunk_end(Pid :: pid()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 send_chunk_end(Pid) ->
-    call(Pid, chunk_end, atom).
+    ftp_internal:send_chunk_end(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% append_chunk_end(Pid) ->  ok | {error, elogin} | {error, echunk}
-%%                             | {error, econn}
-%%        Pid = pid()
-%%
 %% Description:  End appending of chunks to remote file.
 %%--------------------------------------------------------------------------
 
 -spec append_chunk_end(Pid :: pid()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 append_chunk_end(Pid) ->
-    call(Pid, chunk_end, atom).
+    ftp_internal:append_chunk_end(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% append(Pid, LocalFileName [, RemotFileName]) -> ok | {error, epath}
-%%                                                    | {error, elogin}
-%%                                                    | {error, econn}
-%%        Pid = pid()
-%%        LocalFileName = RemotFileName = string()
-%%
 %% Description:  Append the local file to the remote file
 %%--------------------------------------------------------------------------
 
 -spec append(Pid :: pid(), LocalFileName :: string()) ->
-    'ok' |
-        {'error', Reason :: 'epath'    |
-                            'elogin'   |
-                            'etnospc'  |
-                            'epnospc'  |
-                            'efnamena' | common_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
 append(Pid, LocalFileName) ->
     append(Pid, LocalFileName, LocalFileName).
@@ -784,1873 +444,61 @@ append(Pid, LocalFileName) ->
     'ok' | {'error', Reason :: term()}.
 
 append(Pid, LocalFileName, RemotFileName) ->
-    case is_name_sane(RemotFileName) of
-        true ->
-            call(Pid, {append, LocalFileName, RemotFileName}, atom);
-        _ ->
-            {error, efnamena}
-    end.
+    ftp_internal:append(Pid, LocalFileName, RemotFileName).
 
 
 %%--------------------------------------------------------------------------
-%% append_bin(Pid, Bin, RemoteFile) -> ok | {error, epath} | {error, elogin}
-%%                                  | {error, enotbinary} | {error, econn}
-%%        Pid = pid()
-%%        Bin = binary()
-%%        RemoteFile = string()
-%%
 %% Purpose:  Append a binary to a remote file.
 %%--------------------------------------------------------------------------
 
 -spec append_bin(Pid        :: pid(),
                  Bin        :: binary(),
                  RemoteFile :: string()) ->
-    'ok' |
-        {'error', Reason :: restriction_reason() |
-                            common_reason() |
-                            shortage_reason()}.
+    'ok' | {'error', Reason :: term()}.
 
-append_bin(Pid, Bin, RemoteFile) when is_binary(Bin) ->
-    case is_name_sane(RemoteFile) of
-        true ->
-            call(Pid, {append_bin, Bin, RemoteFile}, atom);
-        _ ->
-            {error, efnamena}
-    end;
-append_bin(_Pid, _Bin, _RemoteFile) ->
-    {error, enotbinary}.
+append_bin(Pid, Bin, RemoteFile) ->
+    ftp_internal:append_bin(Pid, Bin, RemoteFile).
 
 
 %%--------------------------------------------------------------------------
-%% quote(Pid, Cmd) -> list()
-%%        Pid = pid()
-%%        Cmd = string()
-%%
 %% Description: Send arbitrary ftp command.
 %%--------------------------------------------------------------------------
 
--spec quote(Pid :: pid(), Cmd :: string()) -> list().
+-spec quote(Pid :: pid(), Cmd :: string()) -> [FTPLine :: string()].
 
 quote(Pid, Cmd) when is_list(Cmd) ->
-    call(Pid, {quote, Cmd}, atom).
+    ftp_internal:quote(Pid, Cmd).
 
 
 %%--------------------------------------------------------------------------
-%% close(Pid) -> ok
-%%        Pid = pid()
-%%
 %% Description:  End the ftp session.
 %%--------------------------------------------------------------------------
 
 -spec close(Pid :: pid()) -> 'ok'.
-
 close(Pid) ->
-    cast(Pid, close),
-    ok.
+    ftp_internal:close(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% formaterror(Tag) -> string()
-%%        Tag = atom() | {error, atom()}
-%%
 %% Description:  Return diagnostics.
 %%--------------------------------------------------------------------------
 
--spec formaterror(Tag :: term()) -> string().
+-spec formaterror(Tag :: atom() | {error, atom()}) -> string().
 
 formaterror(Tag) ->
   ftp_response:error_string(Tag).
 
 
 info(Pid) ->
-    call(Pid, info, list).
+    ftp_internal:info(Pid).
 
 
 %%--------------------------------------------------------------------------
-%% latest_ctrl_response(Pid) -> string()
-%%        Pid = pid()
-%%
 %% Description:  The latest received response from the server
 %%--------------------------------------------------------------------------
 
 -spec latest_ctrl_response(Pid :: pid()) -> string().
 
 latest_ctrl_response(Pid) ->
-    call(Pid, latest_ctrl_response, string).
-
-
-%%%========================================================================
-%%% gen_server callback functions
-%%%========================================================================
-
-%%-------------------------------------------------------------------------
-%% init(Args) -> {ok, State} | {ok, State, Timeout} | {stop, Reason}
-%% Description: Initiates the erlang process that manages a ftp connection.
-%%-------------------------------------------------------------------------
-init(Options) ->
-    process_flag(trap_exit, true),
-
-    %% Keep track of the client
-    {value, {client, Client}} = lists:keysearch(client, 1, Options),
-    erlang:monitor(process, Client),
-
-    %% Make sure inet is started
-    _ = inet_db:start(),
-
-    %% Where are we
-    {ok, Dir} = file:get_cwd(),
-
-    %% Maybe activate dbg
-    case key_search(debug, Options, disable) of
-        trace ->
-            dbg:tracer(),
-            dbg:p(all, [call]),
-            {ok, _} = dbg:tpl(ftp, [{'_', [], [{return_trace}]}]),
-            {ok, _} = dbg:tpl(ftp_response, [{'_', [], [{return_trace}]}]),
-            {ok, _} = dbg:tpl(ftp_progress, [{'_', [], [{return_trace}]}]),
-            ok;
-        debug ->
-            dbg:tracer(),
-            dbg:p(all, [call]),
-            {ok, _} = dbg:tp(ftp, [{'_', [], [{return_trace}]}]),
-            {ok, _} = dbg:tp(ftp_response, [{'_', [], [{return_trace}]}]),
-            {ok, _} = dbg:tp(ftp_progress, [{'_', [], [{return_trace}]}]),
-            ok;
-        _ ->
-            %% Keep silent
-            ok
-    end,
-
-    %% Verbose?
-    Verbose  = key_search(verbose, Options, false),
-
-    %% IpFamily?
-    IpFamily = key_search(ipfamily, Options, inet),
-
-    State    = #state{owner    = Client,
-                      verbose  = Verbose,
-                      ipfamily = IpFamily,
-                      ldir     = Dir},
-
-    %% Set process prio
-    Priority = key_search(priority, Options, low),
-    process_flag(priority, Priority),
-
-    %% And we are done
-    {ok, State}.
-
-
-%%--------------------------------------------------------------------------
-%% handle_call(Request, From, State) -> {reply, Reply, State} |
-%%                                      {reply, Reply, State, Timeout} |
-%%                                      {noreply, State}               |
-%%                                      {noreply, State, Timeout}      |
-%%                                      {stop, Reason, Reply, State}   |
-%% Description: Handle incoming requests.
-%%-------------------------------------------------------------------------
-
-%% Anyone can ask this question
-handle_call({_, info}, _, #state{verbose  = Verbose,
-                                 mode     = Mode,
-                                 timeout  = Timeout,
-                                 ipfamily = IpFamily,
-                                 csock    = Socket,
-                                 progress = Progress} = State) ->
-    {ok, {_, LocalPort}}  = sockname(Socket),
-    {ok, {Address, Port}} = peername(Socket),
-    Options = [{verbose,    Verbose},
-               {ipfamily,   IpFamily},
-               {mode,       Mode},
-               {peer,       Address},
-               {peer_port,  Port},
-               {local_port, LocalPort},
-               {timeout,    Timeout},
-               {progress,   Progress}],
-    {reply, {ok, Options}, State};
-
-handle_call({_,latest_ctrl_response}, _, #state{latest_ctrl_response=Resp} = State) ->
-    {reply, {ok,Resp}, State};
-
-%% But everything else must come from the owner
-handle_call({Pid, _}, _, #state{owner = Owner} = State) when Owner =/= Pid ->
-    {reply, {error, not_connection_owner}, State};
-
-handle_call({_, {open, ip_comm, Options}}, From, State) ->
-    {ok, Opts} = open_options(Options),
-
-    case key_search(host, Opts, undefined) of
-        undefined ->
-            {stop, normal, {error, ehost}, State};
-        Host ->
-            TLSSecMethod = key_search(tls_sec_method, Opts, undefined),
-            TLSOpts  = key_search(tls,      Opts, undefined),
-            TLSReuse = key_search(tls_ctrl_session_reuse, Opts, false),
-            Mode     = key_search(mode,     Opts, ?DEFAULT_MODE),
-            Port0    = key_search(port,     Opts, 0),
-            Port     = if Port0 == 0, TLSSecMethod == ftps -> ?FTPS_PORT; Port0 == 0 -> ?FTP_PORT; true -> Port0 end,
-            Timeout  = key_search(timeout,  Opts, ?CONNECTION_TIMEOUT),
-            DTimeout = key_search(dtimeout, Opts, ?DATA_ACCEPT_TIMEOUT),
-            Progress = key_search(progress, Opts, ignore),
-            IpFamily = key_search(ipfamily, Opts, inet),
-            FtpExt   = key_search(ftp_extension, Opts, ?FTP_EXT_DEFAULT),
-
-            {ok, {CtrlOpts, DataPassOpts, DataActOpts}} = socket_options(Options),
-
-            State2 = State#state{client   = From,
-                                 mode     = Mode,
-                                 progress = progress(Progress),
-                                 ipfamily = IpFamily,
-                                 sockopts_ctrl = CtrlOpts,
-                                 sockopts_data_passive =  DataPassOpts,
-                                 sockopts_data_active = DataActOpts,
-                                 timeout = Timeout,
-                                 dtimeout = DTimeout,
-                                 ftp_extension = FtpExt},
-
-            case setup_ctrl_connection(Host, Port, Timeout, State2) of
-                {ok, State3, WaitTimeout} when is_list(TLSOpts), TLSSecMethod == ftps ->
-                    handle_ctrl_result({tls_upgrade, TLSSecMethod},
-                                       State3#state{tls_options = TLSOpts,
-						    tls_ctrl_session_reuse = TLSReuse,
-						    timeout = WaitTimeout });
-                {ok, State3, WaitTimeout} when is_list(TLSOpts) ->
-                    {noreply, State3#state{tls_options = TLSOpts, tls_ctrl_session_reuse = TLSReuse }, WaitTimeout};
-                {ok, State3, WaitTimeout} ->
-                    {noreply, State3, WaitTimeout};
-                {error, _Reason} ->
-                    gen_server:reply(From, {error, ehost}),
-                    {stop, normal, State2#state{client = undefined}}
-            end
-    end;
-
-handle_call({_, {user, User, Password}}, From,
-            #state{csock = CSock} = State) when (CSock =/= undefined) ->
-    handle_user(User, Password, "", State#state{client = From});
-
-handle_call({_, {user, User, Password, Acc}}, From,
-            #state{csock = CSock} = State) when (CSock =/= undefined) ->
-    handle_user(User, Password, Acc, State#state{client = From});
-
-handle_call({_, {account, Acc}}, From, State)->
-    handle_user_account(Acc, State#state{client = From});
-
-handle_call({_, pwd}, From, #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("PWD", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From, caller = pwd}};
-
-handle_call({_, lpwd}, From, #state{ldir = LDir} = State) ->
-    {reply, {ok, LDir}, State#state{client = From}};
-
-handle_call({_, {cd, Dir}}, From, #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("CWD ~s", [Dir])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From, caller = cd}};
-
-handle_call({_,{lcd, Dir}}, _From, #state{ldir = LDir0} = State) ->
-    LDir = filename:absname(Dir, LDir0),
-    case file:read_file_info(LDir) of %% FIX better check that LDir is a dir.
-        {ok, _ } ->
-            {reply, ok, State#state{ldir = LDir}};
-        _  ->
-            {reply, {error, epath}, State}
-    end;
-
-handle_call({_, {dir, Len, Dir}}, {_Pid, _} = From,
-            #state{chunk = false} = State) ->
-    setup_data_connection(State#state{caller = {dir, Dir, Len},
-                                      client = From});
-handle_call({_, {rename, CurrFile, NewFile}}, From,
-            #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("RNFR ~s", [CurrFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {rename, NewFile}, client = From}};
-
-handle_call({_, {delete, File}}, {_Pid, _} = From,
-            #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("DELE ~s", [File])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From}};
-
-handle_call({_, {mkdir, Dir}}, From, #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("MKD ~s", [Dir])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From}};
-
-handle_call({_,{rmdir, Dir}}, From, #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("RMD ~s", [Dir])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From}};
-
-handle_call({_,{type, Type}}, From, #state{chunk = false} = State0) ->
-    case Type of
-        ascii ->
-            _ = send_ctrl_message(State0, mk_cmd("TYPE A", [])),
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = type, type = ascii,
-                                  client = From}};
-        binary ->
-            _ = send_ctrl_message(State0, mk_cmd("TYPE I", [])),
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = type, type = binary,
-                                  client = From}};
-        _ ->
-            {reply, {error, etype}, State0}
-    end;
-handle_call({_,{recv, RemoteFile, LocalFile}}, From,
-            #state{chunk = false, ldir = LocalDir} = State) ->
-    progress_report({remote_file, RemoteFile}, State),
-    NewLocalFile = filename:absname(LocalFile, LocalDir),
-
-    case file_open(NewLocalFile, write) of
-        {ok, Fd} ->
-            setup_data_connection(State#state{client = From,
-                                              caller =
-                                              {recv_file,
-                                               RemoteFile, Fd}});
-        {error, _What} ->
-            {reply, {error, epath}, State}
-    end;
-handle_call({_, {recv_bin, RemoteFile}}, From, #state{chunk = false} =
-            State) ->
-    setup_data_connection(State#state{caller = {recv_bin, RemoteFile},
-                                      client = From});
-handle_call({_,{recv_chunk_start, RemoteFile}}, From, #state{chunk = false}
-            = State) ->
-    setup_data_connection(State#state{caller = {start_chunk_transfer,
-                                                "RETR", RemoteFile},
-                                      client = From});
-
-handle_call({_, recv_chunk}, _, #state{chunk = false} = State) ->
-    {reply, {error, "ftp:recv_chunk_start/2 not called"}, State};
-handle_call({_, recv_chunk}, _From, #state{chunk = true,
-                                           data = Bin,
-                                           caller = #recv_chunk_closing{dconn_closed       = true,
-                                                                        pos_compl_received = true,
-                                                                        client_called_us = true
-                                                                       } 
-                                          } = State0) ->
-    case Bin of
-        <<>> ->
-            {reply, ok, State0#state{caller = undefined,
-                                     chunk = false,
-                                     client = undefined}};
-        Data ->
-            {reply, Data, State0#state{caller = undefined,
-                                       chunk = false,
-                                       client = undefined}}
-    end;
-handle_call({_, recv_chunk}, _From, #state{chunk = true,
-                                           caller = #recv_chunk_closing{dconn_closed       = true,
-                                                                        pos_compl_received = true
-                                                                       }
-                                          } = State0) ->
-    %% The ftp:recv_chunk call was the last event we waited for, finnish and clean up
-    ?DBG("Data connection closed recv_chunk_closing ftp:recv_chunk, last event",[]),
-    State = activate_ctrl_connection(State0),
-    {reply, ok, State#state{caller = undefined,
-                             chunk = false,
-                             client = undefined}};
-handle_call({_, recv_chunk}, From, #state{chunk = true,
-                                          caller = #recv_chunk_closing{pos_compl_received = true
-                                                                      } = R
-                                         } = State0) ->
-    State = activate_data_connection(State0),
-    {noreply, State#state{client = From, caller = R#recv_chunk_closing{client_called_us=true}}};
-
-handle_call({_, recv_chunk}, From, #state{chunk = true,
-                                          caller = #recv_chunk_closing{} = R
-                                         } = State) ->
-    %% Waiting for more, don't care what
-    ?DBG("recv_chunk_closing ftp:recv_chunk, get more",[]),
-    {noreply, State#state{client = From, caller = R#recv_chunk_closing{client_called_us=true}}};
-
-handle_call({_, recv_chunk}, From, #state{chunk = true} = State0) ->
-    State = activate_data_connection(State0),
-    {noreply, State#state{client = From, caller = recv_chunk}};
-
-handle_call({_, {send, LocalFile, RemoteFile}}, From,
-            #state{chunk = false, ldir = LocalDir} = State) ->
-    progress_report({local_file, filename:absname(LocalFile, LocalDir)},
-                    State),
-    setup_data_connection(State#state{caller = {transfer_file,
-                                                   {"STOR",
-                                                    LocalFile, RemoteFile}},
-                                         client = From});
-handle_call({_, {append, LocalFile, RemoteFile}}, From,
-            #state{chunk = false} = State) ->
-    setup_data_connection(State#state{caller = {transfer_file,
-                                                {"APPE",
-                                                 LocalFile, RemoteFile}},
-                                      client = From});
-handle_call({_, {send_bin, Bin, RemoteFile}}, From,
-            #state{chunk = false} = State) ->
-    setup_data_connection(State#state{caller = {transfer_data,
-                                               {"STOR", Bin, RemoteFile}},
-                                      client = From});
-handle_call({_,{append_bin, Bin, RemoteFile}}, From,
-            #state{chunk = false} = State) ->
-    setup_data_connection(State#state{caller = {transfer_data,
-                                                {"APPE", Bin, RemoteFile}},
-                                      client = From});
-handle_call({_, {send_chunk_start, RemoteFile}}, From, #state{chunk = false}
-            = State) ->
-    setup_data_connection(State#state{caller = {start_chunk_transfer,
-                                                "STOR", RemoteFile},
-                                      client = From});
-handle_call({_, {append_chunk_start, RemoteFile}}, From, #state{chunk = false}
-            = State) ->
-    setup_data_connection(State#state{caller = {start_chunk_transfer,
-                                                "APPE", RemoteFile},
-                                      client = From});
-handle_call({_, {transfer_chunk, Bin}}, _, #state{chunk = true} = State) ->
-    send_data_message(State, Bin),
-    {reply, ok, State};
-
-handle_call({_, {transfer_chunk, _}}, _, #state{chunk = false} = State) ->
-    {reply, {error, echunk}, State};
-
-handle_call({_, chunk_end}, From, #state{chunk = true} = State0) ->
-    close_data_connection(State0),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From, dsock = undefined,
-                          caller = end_chunk_transfer, chunk = false}};
-
-handle_call({_, chunk_end}, _, #state{chunk = false} = State) ->
-    {reply, {error, echunk}, State};
-
-handle_call({_, {quote, Cmd}}, From, #state{chunk = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd(Cmd, [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{client = From, caller = quote}};
-
-handle_call({_, _Req}, _From, #state{csock = CSock} = State)
-  when (CSock =:= undefined) ->
-    {reply, {error, not_connected}, State};
-
-handle_call(_, _, #state{chunk = true} = State) ->
-    {reply, {error, echunk}, State};
-
-%% Catch all -  This can only happen if the application programmer writes
-%% really bad code that violates the API.
-handle_call(Request, _Timeout, State) ->
-    {stop, {'API_violation_connection_closed', Request},
-     {error, {connection_terminated, 'API_violation'}}, State}.
-
-%%--------------------------------------------------------------------------
-%% handle_cast(Request, State) -> {noreply, State} |
-%%                                {noreply, State, Timeout} |
-%%                                {stop, Reason, State}
-%% Description: Handles cast messages.
-%%-------------------------------------------------------------------------
-handle_cast({Pid, close}, #state{owner = Pid} = State) ->
-    _ = send_ctrl_message(State, mk_cmd("QUIT", [])),
-    close_ctrl_connection(State),
-    close_data_connection(State),
-    {stop, normal, State#state{csock = undefined, dsock = undefined}};
-
-handle_cast({Pid, close}, State) ->
-    Report = io_lib:format("A none owner process ~p tried to close an "
-                             "ftp connection: ~n", [Pid]),
-    error_logger:info_report(Report),
-    {noreply, State};
-
-%% Catch all -  This can only happen if the application programmer writes
-%% really bad code that violates the API.
-handle_cast(Msg, State) ->
-  {stop, {'API_violation_connection_closed', Msg}, State}.
-
-%%--------------------------------------------------------------------------
-%% handle_info(Msg, State) -> {noreply, State} | {noreply, State, Timeout} |
-%%                              {stop, Reason, State}
-%% Description: Handles tcp messages from the ftp-server.
-%% Note: The order of the function clauses is significant.
-%%--------------------------------------------------------------------------
-
-handle_info(timeout, #state{caller = open} = State) ->
-    {stop, timeout, State};
-
-handle_info(timeout, State) ->
-    {noreply, State};
-
-%%% Data socket messages %%%
-handle_info({Trpt, Socket, Data},
-            #state{dsock = {Trpt,Socket},
-                   caller = {recv_file, Fd}} = State0) when Trpt==tcp;Trpt==ssl ->
-    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State0]),
-    ok = file_write(binary_to_list(Data), Fd),
-    progress_report({binary, Data}, State0),
-    State = activate_data_connection(State0),
-    {noreply, State};
-
-handle_info({Trpt, Socket, Data}, #state{dsock = {Trpt,Socket}, client = From,
-                                        caller = recv_chunk}
-            = State) when Trpt==tcp;Trpt==ssl ->
-    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State]),
-    gen_server:reply(From, {ok, Data}),
-    {noreply, State#state{client = undefined, caller = undefined, data = <<>>}};
-
-handle_info({Trpt, Socket, Data}, #state{dsock = {Trpt,Socket}} = State0) when Trpt==tcp;Trpt==ssl ->
-    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State0]),
-    State = activate_data_connection(State0),
-    {noreply, State#state{data = <<(State#state.data)/binary,
-                                  Data/binary>>}};
-
-handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
-                                  caller = {recv_file, Fd}} = State0)
-  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    file_close(Fd),
-    progress_report({transfer_size, 0}, State0),
-    State = activate_ctrl_connection(State0),
-    ?DBG("Data channel close",[]),
-    {noreply, State#state{dsock = undefined, data = <<>>}};
-
-handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
-                                  client = Client,
-                                  caller = recv_chunk} = State0)
-  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    ?DBG("Data channel close recv_chunk",[]),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{dsock = undefined,
-                          caller = #recv_chunk_closing{dconn_closed     =  true,
-                                                       client_called_us =  Client =/= undefined}
-                         }};
-handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
-                                  caller = #recv_chunk_closing{client_called_us = true,
-                                                               pos_compl_received = true} = R} = State)
-  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    %% Maybe handle unprocessed chunk message before acking final chunk
-    self() ! {Cls, Socket}, 
-    {noreply, State#state{caller = R#recv_chunk_closing{dconn_closed = true}}};
-
-handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket}, caller = recv_bin,
-                                         data = Data} = State0)
-  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    ?DBG("Data channel close",[]),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{dsock = undefined, data = <<>>,
-                          caller = {recv_bin, Data}}};
-
-handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket}, data = Data,
-                                  caller = {handle_dir_result, Dir}}
-            = State0) when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    ?DBG("Data channel close",[]),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{dsock = undefined,
-                          caller = {handle_dir_result, Dir, Data},
-%                          data = <<?CR,?LF>>}};
-                          data = <<>>}};
-
-handle_info({Err, Socket, Reason}, #state{dsock = {Trpt,Socket},
-                                          client = From} = State)
-  when {Err,Trpt}=={tcp_error,tcp} ; {Err,Trpt}=={ssl_error,ssl} ->
-    gen_server:reply(From, {error, Reason}),
-    close_data_connection(State),
-    {noreply, State#state{dsock = undefined, client = undefined,
-                          data = <<>>, caller = undefined, chunk = false}};
-
-%%% Ctrl socket messages %%%
-handle_info({Transport, Socket, Data}, #state{csock = {Transport, Socket},
-                                              verbose = Verbose,
-                                              caller = Caller,
-                                              client = From,
-                                              ctrl_data = {BinCtrlData, AccLines,
-                                                           LineStatus}}
-            = State0) ->
-    ?DBG('--ctrl ~p ----> ~s~p~n',[Socket,<<BinCtrlData/binary, Data/binary>>,State0]),
-    case ftp_response:parse_lines(<<BinCtrlData/binary, Data/binary>>,
-                                  AccLines, LineStatus) of
-        {ok, Lines, NextMsgData} ->
-            verbose(Lines, Verbose, 'receive'),
-            CtrlResult = ftp_response:interpret(Lines),
-            case Caller of
-                quote ->
-                    gen_server:reply(From, string:tokens(Lines, [?CR, ?LF])),
-                    {noreply, State0#state{client = undefined,
-                                           caller = undefined,
-                                           latest_ctrl_response = Lines,
-                                           ctrl_data = {NextMsgData, [],
-                                                        start}}};
-                _ ->
-                    ?DBG('   ...handle_ctrl_result(~p,...) ctrl_data=~p~n',[CtrlResult,{NextMsgData, [], start}]),
-                    handle_ctrl_result(CtrlResult,
-                                       State0#state{latest_ctrl_response = Lines,
-                                                    ctrl_data =
-                                                        {NextMsgData, [], start}})
-            end;
-        {continue, CtrlData} when CtrlData =/= State0#state.ctrl_data ->
-            ?DBG('   ...Continue... ctrl_data=~p~n',[CtrlData]),
-            State1 = State0#state{ctrl_data = CtrlData},
-            State = activate_ctrl_connection(State1),
-            {noreply, State};
-        {continue, _CtrlData} ->
-            ?DBG('   ...Continue... ctrl_data=~p~n',[_CtrlData]),
-            {noreply, State0}
-    end;
-
-%% If the server closes the control channel it is
-%% the expected behavior that connection process terminates.
-handle_info({Cls, Socket}, #state{csock = {Trpt, Socket}})
-  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
-    exit(normal); %% User will get error message from terminate/2
-
-handle_info({Err, Socket, Reason}, _) when Err==tcp_error ; Err==ssl_error ->
-    Report =
-        io_lib:format("~p on socket: ~p  for reason: ~p~n",
-                      [Err, Socket, Reason]),
-    error_logger:error_report(Report),
-    %% If tcp does not work the only option is to terminate,
-    %% this is the expected behavior under these circumstances.
-    exit(normal); %% User will get error message from terminate/2
-
-%% Monitor messages - if the process owning the ftp connection goes
-%% down there is no point in continuing.
-handle_info({'DOWN', _Ref, _Type, _Process, normal}, State) ->
-    {stop, normal, State#state{client = undefined}};
-
-handle_info({'DOWN', _Ref, _Type, _Process, shutdown}, State) ->
-    {stop, normal, State#state{client = undefined}};
-
-handle_info({'DOWN', _Ref, _Type, _Process, timeout}, State) ->
-    {stop, normal, State#state{client = undefined}};
-
-handle_info({'DOWN', _Ref, _Type, Process, Reason}, State) ->
-    {stop, {stopped, {'EXIT', Process, Reason}},
-     State#state{client = undefined}};
-
-handle_info({'EXIT', Pid, Reason}, #state{progress = Pid} = State) ->
-    Report = io_lib:format("Progress reporting stopped for reason ~p~n",
-                           [Reason]),
-    error_logger:info_report(Report),
-    {noreply, State#state{progress = ignore}};
-
-%% Catch all - throws away unknown messages (This could happen by "accident"
-%% so we do not want to crash, but we make a log entry as it is an
-%% unwanted behaviour.)
-handle_info(Info, State) ->
-    Report = io_lib:format("ftp : ~p : Unexpected message: ~p~nState: ~p~n",
-                           [self(), Info, State]),
-    error_logger:info_report(Report),
-    {noreply, State}.
-
-%%--------------------------------------------------------------------------
-%% terminate/2 and code_change/3
-%%--------------------------------------------------------------------------
-terminate(normal, State) ->
-    %% If terminate reason =/= normal the progress reporting process will
-    %% be killed by the exit signal.
-    progress_report(stop, State),
-    do_terminate({error, econn}, State);
-terminate(Reason, State) ->
-    Report = io_lib:format("Ftp connection closed due to: ~p~n", [Reason]),
-    error_logger:error_report(Report),
-    do_terminate({error, eclosed}, State).
-
-do_terminate(ErrorMsg, State) ->
-    close_data_connection(State),
-    close_ctrl_connection(State),
-    case State#state.client of
-        undefined ->
-            ok;
-        From ->
-            gen_server:reply(From, ErrorMsg)
-    end,
-    ok.
-
-code_change(_Vsn, State1, upgrade_from_pre_5_12) ->
-    {state, CSock, DSock, Verbose, LDir, Type, Chunk, Mode, Timeout,
-     Data, CtrlData, Owner, Client, Caller, IPv6Disable, Progress} = State1,
-    IpFamily =
-        if
-            (IPv6Disable =:= true) ->
-                inet;
-            true ->
-                inet6fb4
-        end,
-    State2 = #state{csock     = CSock,
-                    dsock     = DSock,
-                    verbose   = Verbose,
-                    ldir      = LDir,
-                    type      = Type,
-                    chunk     = Chunk,
-                    mode      = Mode,
-                    timeout   = Timeout,
-                    data      = Data,
-                    ctrl_data = CtrlData,
-                    owner     = Owner,
-                    client    = Client,
-                    caller    = Caller,
-                    ipfamily  = IpFamily,
-                    progress  = Progress},
-    {ok, State2};
-
-code_change(_Vsn, State1, downgrade_to_pre_5_12) ->
-    #state{csock     = CSock,
-           dsock     = DSock,
-           verbose   = Verbose,
-           ldir      = LDir,
-           type      = Type,
-           chunk     = Chunk,
-           mode      = Mode,
-           timeout   = Timeout,
-           data      = Data,
-           ctrl_data = CtrlData,
-           owner     = Owner,
-           client    = Client,
-           caller    = Caller,
-           ipfamily  = IpFamily,
-           progress  = Progress} = State1,
-    IPv6Disable =
-        if
-            (IpFamily =:= inet) ->
-                true;
-            true ->
-                false
-        end,
-    State2 =
-        {state, CSock, DSock, Verbose, LDir, Type, Chunk, Mode, Timeout,
-         Data, CtrlData, Owner, Client, Caller, IPv6Disable, Progress},
-    {ok, State2};
-
-code_change(_Vsn, State, _Extra) ->
-    {ok, State}.
+    ftp_internal:latest_ctrl_response(Pid).
 
-
-%%%=========================================================================
-%% Start/stop
-%%%=========================================================================
-%%--------------------------------------------------------------------------
-%% start_link([Opts, GenServerOptions]) -> {ok, Pid} | {error, Reason}
-%%
-%% Description: Callback function for the ftp supervisor. It is called
-%%            : when open or legacy is called. 
-%%--------------------------------------------------------------------------
-start_link([Opts, GenServerOptions]) ->
-    start_link(Opts, GenServerOptions).
-
-start_link(Opts, GenServerOptions) ->
-    case lists:keysearch(client, 1, Opts) of
-        {value, _} ->
-            %% Via the supervisor
-            gen_server:start_link(?MODULE, Opts, GenServerOptions);
-        false ->
-            Opts2 = [{client, self()} | Opts],
-            gen_server:start_link(?MODULE, Opts2, GenServerOptions)
-    end.
-
-
-%%% Stop functionality is handled by close/1
-
-%%%========================================================================
-%%% Internal functions
-%%%========================================================================
-
-%%--------------------------------------------------------------------------
-%%% Help functions to handle_call and/or handle_ctrl_result
-%%--------------------------------------------------------------------------
-%% User handling
--spec handle_user(User, Password, Account, State) -> Result when
-      User     :: io:format(),
-      Password :: io:format(),
-      Account  :: io:format(),
-      State    :: #state{},
-      Result   :: {noreply, #state{}}.
-handle_user(User, Password, Acc, State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("USER ~s", [User])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {handle_user, Password, Acc}}}.
-
-handle_user_passwd(Password, Acc, State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("PASS ~s", [Password])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {handle_user_passwd, Acc}}}.
-
-handle_user_account(Acc, State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("ACCT ~s", [Acc])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = handle_user_account}}.
-
-
-%%--------------------------------------------------------------------------
-%% handle_ctrl_result
-%%--------------------------------------------------------------------------
--type ctrl_status_operation() :: efnamena
-                               | elogin
-                               | enofile
-                               | epath
-                               | error
-                               | etnospc
-                               | epnospc
-                               | efnamena
-                               | econn
-                               | perm_neg_compl
-                               | pos_compl
-                               | pos_interm
-                               | pos_interm_acct
-                               | pos_prel
-                               | tls_upgrade
-                               | trans_neg_compl.
-
--spec handle_ctrl_result(Operation, State) -> Result when
-      Operation :: {ctrl_status_operation(), list() | atom()},
-      State     :: #state{},
-      Result    :: {noreply, #state{}, integer()}
-                 | {noreply, #state{}}
-                 | {stop, normal | {error, Reason}, #state{}}
-                 | {error, term()},
-      Reason    :: term().
-handle_ctrl_result({pos_compl, _}, #state{csock = {tcp, _Socket},
-                                          tls_options = TLSOptions,
-                                          timeout = Timeout,
-                                          caller = open}
-                   = State0) when is_list(TLSOptions) ->
-    _ = send_ctrl_message(State0, mk_cmd("AUTH TLS", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State, Timeout};
-
-handle_ctrl_result({tls_upgrade, S}, #state{csock = {tcp, Socket},
-                                            tls_options = TLSOptions,
-                                            timeout = Timeout,
-                                            caller = open, client = From}
-                   = State0) when is_list(TLSOptions) ->
-    ?DBG('<--ctrl ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State0]),
-    catch ssl:start(),
-    case ssl:connect(Socket, TLSOptions, Timeout) of
-        {ok, TLSSocket} when S == ftps ->
-            State1 = State0#state{csock = {ssl,TLSSocket}},
-            State = activate_ctrl_connection(State1),
-            {noreply, State#state{tls_upgrading_data_connection = pending}, Timeout};
-        {ok, TLSSocket} ->
-            State1 = State0#state{csock = {ssl,TLSSocket}},
-            handle_ctrl_result({pos_compl, S}, State1#state{tls_upgrading_data_connection = pending});
-        {error, _} = Error ->
-            gen_server:reply(From, Error),
-            {stop, normal, State0#state{client = undefined,
-                                        caller = undefined,
-                                        tls_upgrading_data_connection = false}}
-    end;
-
-handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = pending} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("PBSZ 0", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{tls_upgrading_data_connection = {true, pbsz}}};
-
-handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = {true, pbsz}} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("PROT P", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{tls_upgrading_data_connection = {true, prot}}};
-
-handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = {true, prot},
-                                          client = From} = State) ->
-    gen_server:reply(From, {ok, self()}),
-    {noreply, State#state{client = undefined,
-                          caller = undefined,
-                          tls_upgrading_data_connection = false}};
-handle_ctrl_result({pos_compl, _}, #state{caller = open, client = From}
-                   = State) ->
-    gen_server:reply(From, {ok, self()}),
-    {noreply, State#state{client = undefined,
-                          caller = undefined }};
-handle_ctrl_result({_, Lines}, #state{caller = open} = State) ->
-    ctrl_result_response(econn, State, {error, Lines});
-
-%%--------------------------------------------------------------------------
-%% Data connection setup active mode
-handle_ctrl_result({pos_compl, _Lines},
-                   #state{mode   = active,
-                          caller = {setup_data_connection,
-                                    {LSock, Caller}}} = State) ->
-    handle_caller(State#state{caller = Caller, dsock = {lsock, LSock}});
-
-handle_ctrl_result({Status, _Lines},
-                   #state{mode   = active,
-                          caller = {setup_data_connection, {LSock, _}}}
-                   = State) ->
-    close_connection({tcp,LSock}),
-    ctrl_result_response(Status, State, {error, Status});
-
-%% Data connection setup passive mode
-handle_ctrl_result({pos_compl, Lines},
-                   #state{mode     = passive,
-                          ipfamily = inet6,
-                          client   = From,
-                          caller   = {setup_data_connection, Caller},
-                          csock    = CSock,
-                          sockopts_data_passive = SockOpts,
-                          timeout  = Timeout}
-                   = State) ->
-    [_, PortStr | _] =  lists:reverse(string:tokens(Lines, "|")),
-    {ok, {IP, _}} = peername(CSock),
-    case connect(IP, list_to_integer(PortStr), SockOpts, Timeout, State) of
-        {ok, _, Socket} ->
-            handle_caller(State#state{caller = Caller, dsock = {tcp, Socket}});
-        {error, _Reason} = Error ->
-            gen_server:reply(From, Error),
-            {noreply, State#state{client = undefined, caller = undefined}}
-    end;
-
-handle_ctrl_result({pos_compl, Lines},
-                   #state{mode     = passive,
-                          ipfamily = inet,
-                          client   = From,
-                          caller   = {setup_data_connection, Caller},
-                          timeout  = Timeout,
-                          sockopts_data_passive = SockOpts,
-                          ftp_extension = false} = State) ->
-
-    {_, [?LEFT_PAREN | Rest]} =
-        lists:splitwith(fun(?LEFT_PAREN) -> false; (_) -> true end, Lines),
-    {NewPortAddr, _} =
-        lists:splitwith(fun(?RIGHT_PAREN) -> false; (_) -> true end, Rest),
-    [A1, A2, A3, A4, P1, P2] =
-        lists:map(fun(X) -> list_to_integer(X) end,
-                  string:tokens(NewPortAddr, [$,])),
-    IP   = {A1, A2, A3, A4},
-    Port = (P1 * 256) + P2,
-
-    ?DBG('<--data tcp connect to ~p:~p, Caller=~p~n',[IP,Port,Caller]),
-    case connect(IP, Port, SockOpts, Timeout, State) of
-        {ok, _, Socket}  ->
-            handle_caller(State#state{caller = Caller, dsock = {tcp,Socket}});
-        {error, _Reason} = Error ->
-            gen_server:reply(From, Error),
-            {noreply,State#state{client = undefined, caller = undefined}}
-    end;
-
-handle_ctrl_result({pos_compl, Lines},
-                   #state{mode     = passive,
-                          ipfamily = inet,
-                          client   = From,
-                          caller   = {setup_data_connection, Caller},
-                          csock    = CSock,
-                          timeout  = Timeout,
-                          sockopts_data_passive = SockOpts,
-                          ftp_extension = true} = State) ->
-
-    [_, PortStr | _] =  lists:reverse(string:tokens(Lines, "|")),
-    {ok, {IP, _}} = peername(CSock),
-
-    ?DBG('<--data tcp connect to ~p:~p, Caller=~p~n',[IP,PortStr,Caller]),
-        case connect(IP, list_to_integer(PortStr), SockOpts, Timeout, State) of
-                {ok, _, Socket} ->
-                    handle_caller(State#state{caller = Caller, dsock = {tcp, Socket}});
-                {error, _Reason} = Error ->
-                    gen_server:reply(From, Error),
-                    {noreply, State#state{client = undefined, caller = undefined}}
-    end;
-
-
-%% FTP server does not support passive mode: try to fallback on active mode
-handle_ctrl_result(_,
-                   #state{mode = passive,
-                          caller = {setup_data_connection, Caller}} = State) ->
-    setup_data_connection(State#state{mode = active, caller = Caller});
-
-
-%%--------------------------------------------------------------------------
-%% User handling
-handle_ctrl_result({pos_interm, _},
-                   #state{caller = {handle_user, PassWord, Acc}} = State) ->
-    handle_user_passwd(PassWord, Acc, State);
-handle_ctrl_result({Status, _},
-                   #state{caller = {handle_user, _, _}} = State) ->
-    ctrl_result_response(Status, State, {error, euser});
-
-%% Accounts
-handle_ctrl_result({pos_interm_acct, _},
-                   #state{caller = {handle_user_passwd, Acc}} = State)
-  when Acc =/= "" ->
-    handle_user_account(Acc, State);
-handle_ctrl_result({Status, _},
-                   #state{caller = {handle_user_passwd, _}} = State) ->
-    ctrl_result_response(Status, State, {error, euser});
-
-%%--------------------------------------------------------------------------
-%% Print current working directory
-handle_ctrl_result({pos_compl, Lines},
-                   #state{caller = pwd, client = From} = State) ->
-    Dir = pwd_result(Lines),
-    gen_server:reply(From, {ok, Dir}),
-    {noreply, State#state{client = undefined, caller = undefined}};
-
-%%--------------------------------------------------------------------------
-%% Directory listing
-handle_ctrl_result({pos_prel, _}, #state{caller = {dir, Dir}} = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State1} ->
-            State = activate_data_connection(State1),
-            {noreply, State#state{caller = {handle_dir_result, Dir}}};
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-handle_ctrl_result({pos_compl, _}, #state{caller = {handle_dir_result, ""=_CurrentDir,
-                                                    Data}, client = From}= State) ->
-    gen_server:reply(From, {ok, Data}),
-    {noreply, State#state{client = undefined,
-                          caller = undefined}};
-
-handle_ctrl_result({pos_compl, _}, #state{caller = {handle_dir_result, _Dir,
-                                                    Data}, client = From}= State) ->
-    gen_server:reply(From, {ok, Data}),
-    {noreply, State#state{client = undefined,
-                          caller = undefined}};
-
-handle_ctrl_result({pos_compl, _}=Operation, #state{caller = {handle_dir_result, Dir},
-                                                    data   = Data}= State) ->
-    handle_ctrl_result(Operation, State#state{caller = {handle_dir_result, Dir, Data}});
-
-handle_ctrl_result(S={_Status, _},
-                   #state{caller = {handle_dir_result, _, _}} = State) ->
-    %% OTP-5731, macosx
-    ctrl_result_response(S, State, {error, epath});
-
-handle_ctrl_result({Status, _}, #state{caller = cd} = State) ->
-    ctrl_result_response(Status, State, {error, Status});
-
-handle_ctrl_result(Status={epath, _}, #state{caller = {dir,_}} = State) ->
-     ctrl_result_response(Status, State, {error, epath});
-
-%%--------------------------------------------------------------------------
-%% File renaming
-handle_ctrl_result({pos_interm, _}, #state{caller = {rename, NewFile}}
-                   = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("RNTO ~s", [NewFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = rename_second_phase}};
-
-handle_ctrl_result({Status, _},
-                   #state{caller = {rename, _}} = State) ->
-    ctrl_result_response(Status, State, {error, Status});
-
-handle_ctrl_result({Status, _},
-                   #state{caller = rename_second_phase} = State) ->
-    ctrl_result_response(Status, State, {error, Status});
-
-%%--------------------------------------------------------------------------
-%% File handling - recv_bin
-handle_ctrl_result({pos_prel, _}, #state{caller = recv_bin} = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State1} ->
-            State = activate_data_connection(State1),
-            {noreply, State};
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-handle_ctrl_result({pos_compl, _}, #state{caller = {recv_bin, Data},
-                                          client = From} = State) ->
-    gen_server:reply(From, {ok, Data}),
-    close_data_connection(State),
-    {noreply, State#state{client = undefined, caller = undefined}};
-
-handle_ctrl_result({Status, _}, #state{caller = recv_bin} = State) ->
-    close_data_connection(State),
-    ctrl_result_response(Status, State#state{dsock = undefined},
-                         {error, epath});
-
-handle_ctrl_result({Status, _}, #state{caller = {recv_bin, _}} = State) ->
-    close_data_connection(State),
-    ctrl_result_response(Status, State#state{dsock = undefined},
-                         {error, epath});
-%%--------------------------------------------------------------------------
-%% File handling - start_chunk_transfer
-handle_ctrl_result({pos_prel, _}, #state{caller = start_chunk_transfer}
-                   = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State1} ->
-            State = start_chunk(State1),
-            {noreply, State};
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-%%--------------------------------------------------------------------------
-%% File handling - chunk_transfer complete
-
-handle_ctrl_result({pos_compl, _}, #state{client = From,
-                                          caller = #recv_chunk_closing{dconn_closed       = true,
-                                                                       client_called_us   = true,
-                                                                       pos_compl_received = false
-                                                                      }}
-                   = State0) when From =/= undefined ->
-    %% The pos_compl was the last event we waited for, finnish and clean up
-    ?DBG("recv_chunk_closing pos_compl, last event",[]),
-    gen_server:reply(From, ok),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = undefined,
-                          chunk = false,
-                          client = undefined}};
-
-handle_ctrl_result({pos_compl, _}, #state{caller = #recv_chunk_closing{}=R}
-                   = State0) ->
-    %% Waiting for more, don't care what
-    ?DBG("recv_chunk_closing pos_compl, wait more",[]),
-    {noreply, State0#state{caller = R#recv_chunk_closing{pos_compl_received=true}}};
-
-handle_ctrl_result({pos_compl, _}, #state{caller = undefined, chunk = true}
-                   = State0) ->
-    %% Waiting for user to call recv_chunk
-    {noreply, State0#state{caller = #recv_chunk_closing{pos_compl_received=true}}};
-
-%%--------------------------------------------------------------------------
-%% File handling - recv_file
-handle_ctrl_result({pos_prel, _}, #state{caller = {recv_file, _}} = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State1} ->
-            State = activate_data_connection(State1),
-            {noreply, State};
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-handle_ctrl_result({Status, _}, #state{caller = {recv_file, Fd}} = State) ->
-    file_close(Fd),
-    close_data_connection(State),
-    ctrl_result_response(Status, State#state{dsock = undefined},
-                         {error, epath});
-%%--------------------------------------------------------------------------
-%% File handling - transfer_*
-handle_ctrl_result({pos_prel, _}, #state{caller = {transfer_file, Fd}}
-                   = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State1} ->
-            send_file(State1, Fd);
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-handle_ctrl_result({pos_prel, _}, #state{caller = {transfer_data, Bin}}
-                   = State0) ->
-    case accept_data_connection(State0) of
-        {ok, State} ->
-            send_bin(State, Bin);
-        {error, _Reason} = Error ->
-            ctrl_result_response(error, State0, Error)
-    end;
-
-%%--------------------------------------------------------------------------
-%% Default
-handle_ctrl_result({Status, _Lines}, #state{client = From} = State)
-  when From =/= undefined ->
-    ctrl_result_response(Status, State, {error, Status});
-handle_ctrl_result(CtrlMsg, #state{caller = undefined} = State) ->
-    logger:log(info, #{protocol => ftp, unexpected_msg => CtrlMsg}),
-    {noreply, State}.
-
-%%--------------------------------------------------------------------------
-%% Help functions to handle_ctrl_result
-%%--------------------------------------------------------------------------
-
--spec ctrl_result_response(Status, State, Error) -> Result when
-      Status :: ctrl_status_operation() | {ctrl_status_operation(), _},
-      State  :: #state{},
-      Error  :: {error, Reason},
-      Reason :: term(),
-      Result :: {noreply, #state{}} | Error.
-ctrl_result_response(pos_compl, #state{client = From} = State, _)  ->
-    gen_server:reply(From, ok),
-    {noreply, State#state{client = undefined, caller = undefined}};
-
-ctrl_result_response(enofile, #state{client = From} = State, _) ->
-    gen_server:reply(From, {error, enofile}),
-    {noreply, State#state{client = undefined, caller = undefined}};
-
-ctrl_result_response(error, State0, {error, _Reason} = Error) ->
-    case State0#state.client of
-        undefined ->
-            {stop, Error, State0};
-        From ->
-            gen_server:reply(From, Error),
-            State = activate_ctrl_connection(State0),
-            {noreply, State}
-    end;
-
-ctrl_result_response(Status, #state{client = From} = State, _)
-  when (Status =:= etnospc)  orelse
-       (Status =:= epnospc)  orelse
-       (Status =:= efnamena) orelse
-       (Status =:= econn) ->
-    gen_server:reply(From, {error, Status}),
-    {stop, normal, State#state{client = undefined}};
-
-ctrl_result_response(_, #state{client = From} = State, ErrorMsg) ->
-    gen_server:reply(From, ErrorMsg),
-    {noreply, State#state{client = undefined, caller = undefined}}.
-
-%%--------------------------------------------------------------------------
--spec handle_caller(State) -> Result when
-      State  :: #state{},
-      Result :: {noreply, #state{}}.
-handle_caller(#state{caller = {dir, Dir, Len}} = State0) ->
-    Cmd = case Len of
-              short -> "NLST";
-              long -> "LIST"
-          end,
-    _ = case Dir of
-            "" ->
-                send_ctrl_message(State0, mk_cmd(Cmd, ""));
-            _ ->
-                send_ctrl_message(State0, mk_cmd(Cmd ++ " ~s", [Dir]))
-        end,
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {dir, Dir}}};
-
-handle_caller(#state{caller = {recv_bin, RemoteFile}} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("RETR ~s", [RemoteFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = recv_bin}};
-
-handle_caller(#state{caller = {start_chunk_transfer, Cmd, RemoteFile}} =
-              State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = start_chunk_transfer}};
-
-handle_caller(#state{caller = {recv_file, RemoteFile, Fd}} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("RETR ~s", [RemoteFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {recv_file, Fd}}};
-
-handle_caller(#state{caller = {transfer_file, {Cmd, LocalFile, RemoteFile}},
-                     ldir = LocalDir, client = From} = State0) ->
-    case file_open(filename:absname(LocalFile, LocalDir), read) of
-        {ok, Fd} ->
-            _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = {transfer_file, Fd}}};
-        {error, _} ->
-            gen_server:reply(From, {error, epath}),
-            {noreply, State0#state{client = undefined, caller = undefined,
-                                   dsock = undefined}}
-    end;
-
-handle_caller(#state{caller = {transfer_data, {Cmd, Bin, RemoteFile}}} =
-              State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {transfer_data, Bin}}}.
-
-%%  ----------- FTP SERVER COMMUNICATION  -------------------------
-
-%% Connect to FTP server at Host (default is TCP port 21)
-%% in order to establish a control connection.
--spec setup_ctrl_connection(Host, Port, Timeout, State) -> Result when
-      Host    :: inet:socket_address() | inet:hostname(),
-      Port    :: inet:port_number(),
-      Timeout :: timeout(),
-      State   :: #state{},
-      Reason  :: timeout | inet:posix(),
-      Result  :: {ok, State, integer()} | {error, Reason}.
-setup_ctrl_connection(Host, Port, Timeout, #state{sockopts_ctrl = SockOpts} = State0) ->
-    MsTime = erlang:monotonic_time(),
-    case connect(Host, Port, SockOpts, Timeout, State0) of
-        {ok, IpFam, CSock} ->
-            State1 = State0#state{csock = {tcp, CSock}, ipfamily = IpFam},
-            State = activate_ctrl_connection(State1),
-            case Timeout - millisec_passed(MsTime) of
-                Timeout2 when (Timeout2 >= 0) ->
-                    {ok, State#state{caller = open}, Timeout2};
-                _ ->
-                    %% Oups: Simulate timeout
-                    {ok, State#state{caller = open}, 0}
-            end;
-        Error ->
-            Error
-    end.
-
--spec setup_data_connection(State) -> Result when
-      State :: #state{},
-      Result :: {noreply, State}.
-setup_data_connection(#state{mode   = active,
-                             caller = Caller,
-                             csock  = CSock,
-                             sockopts_data_active = SockOpts,
-                             ftp_extension = FtpExt} = State0) ->
-    case (catch sockname(CSock)) of
-        {ok, {{_, _, _, _, _, _, _, _} = IP0, _}} ->
-            IP = proplists:get_value(ip, SockOpts, IP0),
-            {ok, LSock} =
-                gen_tcp:listen(0, [{ip, IP}, {active, false},
-                                   inet6, binary, {packet, 0} |
-                                   lists:keydelete(ip,1,SockOpts)]),
-            {ok, {_, Port}} = sockname({tcp,LSock}),
-            IpAddress = inet_parse:ntoa(IP),
-            Cmd = mk_cmd("EPRT |2|~s|~p|", [IpAddress, Port]),
-            _ = send_ctrl_message(State0, Cmd),
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = {setup_data_connection,
-                                            {LSock, Caller}}}};
-        {ok, {{_,_,_,_} = IP0, _}} ->
-            IP = proplists:get_value(ip, SockOpts, IP0),
-            {ok, LSock} = gen_tcp:listen(0, [{ip, IP}, {active, false},
-                                             binary, {packet, 0} |
-                                             lists:keydelete(ip,1,SockOpts)]),
-            {ok, Port} = inet:port(LSock),
-            _ = case FtpExt of
-                    false ->
-                        {IP1, IP2, IP3, IP4} = IP,
-                        {Port1, Port2} = {Port div 256, Port rem 256},
-                        send_ctrl_message(State0,
-                                          mk_cmd("PORT ~w,~w,~w,~w,~w,~w",
-                                                 [IP1, IP2, IP3, IP4, Port1, Port2]));
-                    true ->
-                        IpAddress = inet_parse:ntoa(IP),
-                        Cmd = mk_cmd("EPRT |1|~s|~p|", [IpAddress, Port]),
-                        send_ctrl_message(State0, Cmd)
-                end,
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = {setup_data_connection,
-                                            {LSock, Caller}}}}
-    end;
-
-setup_data_connection(#state{mode = passive, ipfamily = inet6,
-                             caller = Caller} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("EPSV", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {setup_data_connection, Caller}}};
-
-setup_data_connection(#state{mode = passive, ipfamily = inet,
-                             caller = Caller,
-                             ftp_extension = false} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("PASV", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {setup_data_connection, Caller}}};
-
-setup_data_connection(#state{mode = passive, ipfamily = inet,
-                             caller = Caller,
-                             ftp_extension = true} = State0) ->
-    _ = send_ctrl_message(State0, mk_cmd("EPSV", [])),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = {setup_data_connection, Caller}}}.
-
--spec connect(Host, Port, SockOpts, Timeout, State) -> Result when
-      Host     :: inet:socket_address() | inet:hostname(),
-      Port     :: inet:port_number(),
-      SockOpts :: [inet:inet_backend() | gen_tcp:connect_option()],
-      Timeout :: timeout(),
-      State   :: #state{},
-      Reason  :: timeout | inet:posix(),
-      Result  :: {ok, inet:address_family(), gen_tcp:socket()} | {error, Reason}.
-connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet = IpFam}) ->
-    connect2(Host, Port, IpFam, SockOpts, Timeout);
-
-connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet6 = IpFam}) ->
-    connect2(Host, Port, IpFam, SockOpts, Timeout);
-
-connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet6fb4}) ->
-    case inet:getaddr(Host, inet6) of
-        {ok, {0, 0, 0, 0, 0, 16#ffff, _, _} = IPv6} ->
-            case inet:getaddr(Host, inet) of
-                {ok, IPv4} ->
-                    IpFam = inet,
-                    connect2(IPv4, Port, IpFam, SockOpts, Timeout);
-
-                _ ->
-                    IpFam = inet6,
-                    connect2(IPv6, Port, IpFam, SockOpts, Timeout)
-            end;
-
-        {ok, IPv6} ->
-            IpFam = inet6,
-            connect2(IPv6, Port, IpFam, SockOpts, Timeout);
-
-        _ ->
-            case inet:getaddr(Host, inet) of
-                {ok, IPv4} ->
-                    IpFam = inet,
-                    connect2(IPv4, Port, IpFam, SockOpts, Timeout);
-                Error ->
-                    Error
-            end
-    end.
-
--spec connect2(Host, Port, IpFam, SockOpts, Timeout) -> Result when
-      Host     :: inet:socket_address() | inet:hostname(),
-      Port     :: inet:port_number(),
-      SockOpts :: [inet:inet_backend() | gen_tcp:connect_option()],
-      Timeout  :: timeout(),
-      IpFam    :: inet:address_family(),
-      Reason   :: timeout | inet:posix(),
-      Result   :: {ok, inet:address_family(), gen_tcp:socket()} | {error, Reason}.
-connect2(Host, Port, IpFam, SockOpts, Timeout) ->
-    Opts = [IpFam, binary, {packet, 0}, {active, false} | SockOpts],
-    case gen_tcp:connect(Host, Port, Opts, Timeout) of
-        {ok, Sock} ->
-            {ok, IpFam, Sock};
-        Error ->
-            Error
-    end.
-
--spec accept_data_connection_tls_options(State) -> Result when
-      State  :: #state{},
-      Result :: [tuple()].
-accept_data_connection_tls_options(#state{ csock = {ssl,Socket}, tls_options = TO0, tls_ctrl_session_reuse = true }) ->
-	TO = lists:keydelete(reuse_sessions, 1, TO0),
-	{ok, [{session_id,SSLSessionId},{session_data,SSLSessionData}]} = ssl:connection_information(Socket, [session_id, session_data]),
-	lists:keystore(reuse_session, 1, TO, {reuse_session,{SSLSessionId,SSLSessionData}});
-accept_data_connection_tls_options(#state{ tls_options = TO }) ->
-	TO.
-
--spec accept_data_connection(State) -> Result when
-      State  :: #state{},
-      Result :: {ok, #state{}} | {error, Reason},
-      Reason :: term().
-accept_data_connection(#state{mode     = active,
-                              dtimeout = DTimeout,
-                              tls_options = TLSOptions0,
-                              dsock    = {lsock, LSock}} = State0) ->
-    case gen_tcp:accept(LSock, DTimeout) of
-        {ok, Socket} when is_list(TLSOptions0) ->
-            gen_tcp:close(LSock),
-            TLSOptions = accept_data_connection_tls_options(State0),
-            ?DBG('<--data ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State0]),
-            case ssl:connect(Socket, TLSOptions, DTimeout) of
-                {ok, TLSSocket} ->
-                    {ok, State0#state{dsock={ssl,TLSSocket}}};
-                {error, Reason} ->
-                    {error, {ssl_connect_failed, Reason}}
-            end;
-        {ok, Socket} ->
-            gen_tcp:close(LSock),
-            {ok, State0#state{dsock={tcp,Socket}}};
-        {error, Reason} ->
-            {error, {data_connect_failed, Reason}}
-    end;
-
-accept_data_connection(#state{mode = passive,
-                              dtimeout = DTimeout,
-                              dsock = {tcp,Socket},
-                              tls_options = TLSOptions0} = State) when is_list(TLSOptions0) ->
-    TLSOptions = accept_data_connection_tls_options(State),
-    ?DBG('<--data ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State]),
-    case ssl:connect(Socket, TLSOptions, DTimeout) of
-        {ok, TLSSocket} ->
-            {ok, State#state{dsock={ssl,TLSSocket}}};
-        {error, Reason} ->
-            {error, {ssl_connect_failed, Reason}}
-    end;
-accept_data_connection(#state{mode = passive} = State) ->
-    {ok,State}.
-
--spec send_ctrl_message(State, Message) -> _ when
-      State   :: #state{},
-      Message :: [term() | Message].
-send_ctrl_message(_S=#state{csock = Socket, verbose = Verbose}, Message) ->
-    verbose(lists:flatten(Message),Verbose,send),
-    ?DBG('<--ctrl ~p ---- ~s~p~n',[Socket,Message,_S]),
-    _ = send_message(Socket, Message).
-
-send_data_message(_S=#state{dsock = Socket}, Message) ->
-    ?DBG('<==data ~p ==== ~s~n~p~n',[Socket,Message,_S]),
-    case send_message(Socket, Message) of
-        ok ->
-            ok;
-        {error, Reason} ->
-            Report = io_lib:format("send/2 for socket ~p failed with "
-                                   "reason ~p~n", [Socket, Reason]),
-            error_logger:error_report(Report),
-            %% If tcp/ssl does not work the only option is to terminate,
-            %% this is the expected behavior under these circumstances.
-            exit(normal) %% User will get error message from terminate/2
-    end.
-
-send_message({tcp, Socket}, Message) ->
-    gen_tcp:send(Socket, Message);
-send_message({ssl, Socket}, Message) ->
-    ssl:send(Socket, Message).
-
-activate_ctrl_connection(#state{csock = CSock, ctrl_data = {<<>>, _, _}} = State) ->
-    _ = activate_connection(CSock),
-    State;
-activate_ctrl_connection(#state{csock = CSock} = State0) ->
-    _ = activate_connection(CSock),
-    %% We have already received at least part of the next control message,
-    %% that has been saved in ctrl_data, process this first.
-    {noreply, State} = handle_info({socket_type(CSock), unwrap_socket(CSock), <<>>}, State0),
-    State.
-
-activate_data_connection(#state{dsock = DSock} = State) ->
-    _ = activate_connection(DSock),
-    State.
-
-activate_connection(Socket) ->
-    case socket_type(Socket) of
-        tcp ->
-            _ = activate_connection(inet, tcp_closed, Socket);
-        ssl ->
-            _ = activate_connection(ssl, ssl_closed, Socket)
-    end.
-
-activate_connection(API, CloseTag, Socket0) ->
-    Socket = unwrap_socket(Socket0),
-    case API:setopts(Socket, [{active, once}]) of
-        ok ->
-            ok;
-        {error, _} -> %% inet can return einval instead of closed
-            self() ! {CloseTag, Socket}
-    end.
-
-ignore_return_value(_) -> ok.
-
-unwrap_socket({tcp,Socket}) -> Socket;
-unwrap_socket({ssl,Socket}) -> Socket.
-
-socket_type({tcp,_Socket}) -> tcp;
-socket_type({ssl,_Socket}) -> ssl.
-
-close_ctrl_connection(#state{csock = undefined}) -> ok;
-close_ctrl_connection(#state{csock = Socket}) -> close_connection(Socket).
-
-close_data_connection(#state{dsock = undefined}) -> ok;
-close_data_connection(#state{dsock = Socket}) -> close_connection(Socket).
-
-close_connection({lsock,Socket}) -> ignore_return_value( gen_tcp:close(Socket) );
-close_connection({tcp, Socket})  -> ignore_return_value( gen_tcp:close(Socket) );
-close_connection({ssl, Socket})  -> ignore_return_value( ssl:close(Socket) ).
-
-%%  ------------ FILE HANDLING  ----------------------------------------
-send_file(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State, Fd) ->
-    {noreply, State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, send_file, Fd}}};
-send_file(State0, Fd) ->
-    case file_read(Fd) of
-        {ok, N, Bin} when N > 0 ->
-            send_data_message(State0, Bin),
-            progress_report({binary, Bin}, State0),
-            send_file(State0, Fd);
-        {ok, _, _} ->
-            file_close(Fd),
-            close_data_connection(State0),
-            progress_report({transfer_size, 0}, State0),
-            State = activate_ctrl_connection(State0),
-            {noreply, State#state{caller = transfer_file_second_phase,
-                                  dsock = undefined}};
-        {error, Reason} ->
-            gen_server:reply(State0#state.client, {error, Reason}),
-            {stop, normal, State0#state{client = undefined}}
-    end.
-
-file_open(File, Option) ->
-  file:open(File, [raw, binary, Option]).
-
-file_close(Fd) ->
-    ignore_return_value( file:close(Fd) ).
-
-file_read(Fd) ->
-    case file:read(Fd, ?FILE_BUFSIZE) of
-        {ok, Bytes} when is_binary(Bytes) ->
-            {ok, byte_size(Bytes), Bytes};
-        eof ->
-            {ok, 0, []};
-        Other ->
-            Other
-    end.
-
-file_write(Bytes, Fd) ->
-    file:write(Fd, Bytes).
-
-%% --------------  MISC ----------------------------------------------
-
-call(GenServer, Msg, Format) ->
-    call(GenServer, Msg, Format, infinity).
-call(GenServer, Msg, Format, Timeout) ->
-    Req = {self(), Msg},
-    case (catch gen_server:call(GenServer, Req, Timeout)) of
-        {ok, Bin} when is_binary(Bin) andalso (Format =:= string) ->
-            {ok, binary_to_list(Bin)};
-        {'EXIT', _, _} ->
-            {error, eclosed};
-        {'EXIT', _} ->
-            {error, eclosed};
-        Result ->
-            Result
-    end.
-
-cast(GenServer, Msg) ->
-    gen_server:cast(GenServer, {self(), Msg}).
-
-send_bin(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State, Bin) ->
-    State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, send_bin, Bin}};
-send_bin(State0, Bin) ->
-    send_data_message(State0, Bin),
-    close_data_connection(State0),
-    State = activate_ctrl_connection(State0),
-    {noreply, State#state{caller = transfer_data_second_phase,
-                          dsock = undefined}}.
-
-mk_cmd(Fmt, Args) ->
-    [io_lib:format(Fmt, Args)| [?CR, ?LF]]. % Deep list ok.
-
-is_name_sane([]) ->
-    true;
-is_name_sane([?CR| _]) ->
-    false;
-is_name_sane([?LF| _]) ->
-    false;
-is_name_sane([_| Rest]) ->
-    is_name_sane(Rest).
-
-pwd_result(Lines) ->
-    {_, [?DOUBLE_QUOTE | Rest]} =
-        lists:splitwith(fun(?DOUBLE_QUOTE) -> false; (_) -> true end, Lines),
-    {Dir, _} =
-        lists:splitwith(fun(?DOUBLE_QUOTE) -> false; (_) -> true end, Rest),
-    Dir.
-
-
-key_search(Key, List, Default) ->
-    case lists:keysearch(Key, 1, List) of
-        {value, {_,Val}} ->
-            Val;
-        false ->
-            Default
-    end.
-
-verbose(Lines, true, Direction) ->
-    DirStr =
-        case Direction of
-            send ->
-                "Sending: ";
-            _ ->
-                "Receiving: "
-        end,
-    Str = string:strip(string:strip(Lines, right, ?LF), right, ?CR),
-    erlang:display(DirStr++Str);
-verbose(_, false,_) ->
-    ok.
-
-progress(Options) ->
-    ftp_progress:start_link(Options).
-
-progress_report(_, #state{progress = ignore}) ->
-    ok;
-progress_report(stop, #state{progress = ProgressPid}) ->
-    ftp_progress:stop(ProgressPid);
-progress_report({binary, Data}, #state{progress = ProgressPid}) when is_binary(Data) ->
-    ftp_progress:report(ProgressPid, {transfer_size, byte_size(Data)});
-progress_report(Report, #state{progress = ProgressPid}) ->
-    ftp_progress:report(ProgressPid, Report).
-
-
-peername({tcp, Socket}) -> inet:peername(Socket);
-peername({ssl, Socket}) -> ssl:peername(Socket).
-
-sockname({tcp, Socket}) -> inet:sockname(Socket);
-sockname({ssl, Socket}) -> ssl:sockname(Socket).
-
-start_chunk(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State) ->
-    State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, start_chunk, undefined}};
-start_chunk(#state{client = From} = State) ->
-    gen_server:reply(From, ok),
-    State#state{chunk = true,
-                client = undefined,
-                caller = undefined}.
-
-
-%% This function extracts the start options from the
-%% Valid options:
-%%     debug,
-%%     verbose
-%%     ipfamily
-%%     priority
-%%     flags    (for backward compatibillity)
-start_options(Options) ->
-    case lists:keysearch(flags, 1, Options) of
-        {value, {flags, Flags}} ->
-            Verbose = lists:member(verbose, Flags),
-            IsTrace = lists:member(trace, Flags),
-            IsDebug = lists:member(debug, Flags),
-            DebugLevel =
-                if
-                    (IsTrace =:= true) ->
-                        trace;
-                    IsDebug =:= true ->
-                        debug;
-                    true ->
-                        disable
-                end,
-            {ok, [{verbose,  Verbose},
-                  {debug,    DebugLevel},
-                  {priority, low}]};
-        false ->
-            ValidateVerbose =
-                fun(true) -> true;
-                   (false) -> true;
-                   (_) -> false
-                end,
-            ValidateDebug =
-                fun(trace) -> true;
-                   (debug) -> true;
-                   (disable) -> true;
-                   (_) -> false
-                end,
-            ValidatePriority =
-                fun(low) -> true;
-                   (normal) -> true;
-                   (high) -> true;
-                   (_) -> false
-                end,
-            ValidOptions =
-                [{verbose,  ValidateVerbose,  false, false},
-                 {debug,    ValidateDebug,    false, disable},
-                 {priority, ValidatePriority, false, low}],
-            validate_options(Options, ValidOptions, [])
-    end.
-
-
-%% This function extracts and validates the open options from the
-%% Valid options:
-%%    mode
-%%    host
-%%    port
-%%    timeout
-%%    dtimeout
-%%    progress
-%%          ftp_extension
-
--spec open_options([tuple()]) -> {ok, [tuple()]} | no_return().
-open_options(Options) ->
-    ValidateMode =
-        fun(active) -> true;
-           (passive) -> true;
-           (_) -> false
-        end,
-    ValidateHost =
-        fun(Host) when is_list(Host) ->
-                true;
-           (Host) when tuple_size(Host) =:= 4; tuple_size(Host) =:= 8 ->
-                true;
-           (_) ->
-                false
-        end,
-    ValidatePort =
-        fun(Port) when is_integer(Port) andalso (Port >= 0) -> true;
-           (_) -> false
-        end,
-    ValidateIpFamily =
-        fun(inet) -> true;
-           (inet6) -> true;
-           (inet6fb4) -> true;
-           (_) -> false
-        end,
-    ValidateTLS =
-        fun(TLS) when is_list(TLS) -> true;
-           (undefined) -> true;
-           (_) -> false
-        end,
-    ValidateTLSSecMethod =
-        fun(ftpes) -> true;
-           (ftps) -> true;
-           (_) -> false
-        end,
-    ValidateTLSCtrlSessionReuse =
-        fun(Reuse) when is_boolean(Reuse) -> true;
-           (_) -> false
-        end,
-    ValidateTimeout =
-        fun(Timeout) when is_integer(Timeout) andalso (Timeout >= 0) -> true;
-           (_) -> false
-        end,
-    ValidateDTimeout =
-        fun(DTimeout) when is_integer(DTimeout) andalso (DTimeout >= 0) -> true;
-           (infinity) -> true;
-           (_) -> false
-        end,
-    ValidateProgress =
-        fun(ignore) ->
-                true;
-           ({Mod, Func, _InitProgress}) when is_atom(Mod) andalso
-                                             is_atom(Func) ->
-                true;
-           (_) ->
-                false
-        end,
-        ValidateFtpExtension =
-        fun(true) -> true;
-                (false) -> true;
-                (_) -> false
-        end,
-    ValidOptions =
-        [{mode,     ValidateMode,     false, ?DEFAULT_MODE},
-         {host,     ValidateHost,     true,  ehost},
-         {port,     ValidatePort,     false, 0},
-         {ipfamily, ValidateIpFamily, false, inet},
-         {tls,      ValidateTLS,      false, undefined},
-         {tls_sec_method, ValidateTLSSecMethod, false, ftpes},
-         {tls_ctrl_session_reuse, ValidateTLSCtrlSessionReuse, false, false},
-         {timeout,  ValidateTimeout,  false, ?CONNECTION_TIMEOUT},
-         {dtimeout, ValidateDTimeout, false, ?DATA_ACCEPT_TIMEOUT},
-         {progress, ValidateProgress, false, ?PROGRESS_DEFAULT},
-         {ftp_extension, ValidateFtpExtension, false, ?FTP_EXT_DEFAULT}],
-    validate_options(Options, ValidOptions, []).
-
-%% validates socket options and set defaults
--spec socket_options([tuple()]) -> {ok, tuple()} | no_return().
-socket_options(Options) ->
-    CtrlOpts = proplists:get_value(sock_ctrl, Options, []),
-    DataActOpts = proplists:get_value(sock_data_act, Options, CtrlOpts),
-    DataPassOpts = proplists:get_value(sock_data_pass, Options, CtrlOpts),
-    case [O || O <- lists:usort(CtrlOpts++DataPassOpts++DataActOpts),
-               not valid_socket_option(O)] of
-        [] ->
-            {ok, {CtrlOpts, DataPassOpts, DataActOpts}};
-        Invalid ->
-            throw({error,{sock_opts,Invalid}})
-    end.
-
-
-valid_socket_option(inet            ) -> false;
-valid_socket_option(inet6           ) -> false;
-valid_socket_option({ipv6_v6only, _}) -> false;
-valid_socket_option({active,_}      ) -> false;
-valid_socket_option({packet,_}      ) -> false;
-valid_socket_option({mode,_}        ) -> false;
-valid_socket_option(binary          ) -> false;
-valid_socket_option(list            ) -> false;
-valid_socket_option({header,_}      ) -> false;
-valid_socket_option({packet_size,_} ) -> false;
-valid_socket_option(_) -> true.
-
-
--spec validate_options(Options, ValidOptions, Acc) -> Result when
-      Options      :: [tuple()],
-      ValidOptions :: [tuple()],
-      Acc          :: [tuple()],
-      Result       :: {ok, [tuple()]} | no_return().
-validate_options([], [], Acc) ->
-    {ok, lists:reverse(Acc)};
-validate_options([], ValidOptions, Acc) ->
-    %% Check if any mandatory options are missing!
-    case [{Key, Reason} || {Key, _, true, Reason} <- ValidOptions] of
-        [] ->
-            Defaults =
-                [{Key, Default} || {Key, _, _, Default} <- ValidOptions],
-            {ok, lists:reverse(Defaults ++ Acc)};
-        [{_, Reason}|_Missing] ->
-            throw({error, Reason})
-    end;
-validate_options([{Key, Value}|Options], ValidOptions, Acc) ->
-    case lists:keysearch(Key, 1, ValidOptions) of
-        {value, {Key, Validate, _, Default}} ->
-            case (catch Validate(Value)) of
-                true ->
-                    NewValidOptions = lists:keydelete(Key, 1, ValidOptions),
-                    validate_options(Options, NewValidOptions,
-                                     [{Key, Value} | Acc]);
-                _ ->
-                    NewValidOptions = lists:keydelete(Key, 1, ValidOptions),
-                    validate_options(Options, NewValidOptions,
-                                     [{Key, Default} | Acc])
-            end;
-        false ->
-            validate_options(Options, ValidOptions, Acc)
-    end;
-validate_options([_|Options], ValidOptions, Acc) ->
-    validate_options(Options, ValidOptions, Acc).
-
-%% Help function, elapsed milliseconds since T0
-millisec_passed(T0) ->
-    %% OTP 18
-    erlang:convert_time_unit(erlang:monotonic_time() - T0,
-                             native,
-                             micro_seconds) div 1000.
diff --git a/lib/ftp/src/ftp_internal.erl b/lib/ftp/src/ftp_internal.erl
new file mode 100644
index 0000000000..2b8ee8f9e1
--- /dev/null
+++ b/lib/ftp/src/ftp_internal.erl
@@ -0,0 +1,2467 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2002-2023. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+%%
+
+-module(ftp_internal).
+
+-behaviour(gen_server).
+
+-export([start_service/1]).
+
+-export([start_link/1, start_link/2]).
+
+%%  API - Client interface
+-export([cd/2, close/1, delete/2,
+         lcd/2, lpwd/1, ls/2,
+         mkdir/2, nlist/2,
+         open/1, open/2,
+         pwd/1, quote/2,
+         recv/2, recv/3, recv_bin/2,
+         recv_chunk_start/2, recv_chunk/1,
+         rename/3, rmdir/2,
+         send/2, send/3, send_bin/3,
+         send_chunk_start/2, send_chunk/2, send_chunk_end/1,
+         type/2, user/3, user/4, account/2,
+         append/3, append_bin/3,
+         append_chunk/2, append_chunk_end/1, append_chunk_start/2,
+         info/1, latest_ctrl_response/1]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2,
+         handle_info/2, terminate/2, code_change/3]).
+
+-include("ftp_internal.hrl").
+
+-define(DBG(F,A), 'n/a').
+%%-define(DBG(F,A), io:format(F,A)).
+%%-define(DBG(F,A), ct:pal("~p:~p " ++ if is_list(F) -> F; is_atom(F) -> atom_to_list(F) end, [?MODULE,?LINE|A])).
+
+%% Constants used in internal state definition
+-define(CONNECTION_TIMEOUT,  60*1000).
+-define(DATA_ACCEPT_TIMEOUT, infinity).
+-define(DEFAULT_MODE,        passive).
+-define(PROGRESS_DEFAULT,    ignore).
+-define(FTP_EXT_DEFAULT,     false).
+
+%% Internal Constants
+-define(FTP_PORT, 21).
+-define(FTPS_PORT, 990).
+-define(FILE_BUFSIZE, 4096).
+
+
+%%%=========================================================================
+%%%  Data Types
+%%%=========================================================================
+
+%% Internal state
+-record(state, {
+          csock   = undefined :: undefined  % Control connection socket
+                               | { tcp | ssl, inet:socket() | ssl:socket() | ssl:sslsocket()},
+          dsock   = undefined :: undefined % Data connection socket
+                               | { tcp | ssl | lsock, inet:socket() | ssl:socket() | ssl:sslsocket() | gen_tcp:socket()},
+          tls_options = undefined :: undefined | [tuple()],
+          verbose = false  :: boolean(),
+          ldir    = undefined :: undefined | file:filename_all(), % Current local directory
+          type    = ftp_server_default :: atom(), % binary | ascii
+          chunk   = false :: boolean(), % Receiving data chunks
+          mode    = ?DEFAULT_MODE :: active | passive,
+          timeout = ?CONNECTION_TIMEOUT :: timeout(),
+          %% Data received so far on the data connection
+          data    = <<>> :: binary(),
+          %% Data received so far on the control connection
+          %% {BinStream, AccLines}. If a binary sequence
+          %% ends with ?CR then keep it in the binary to
+          %% be able to detect if the next received byte is ?LF
+          %% and hence the end of the response is reached!
+          ctrl_data = {<<>>, [], start} :: {binary(), [byte()], term()},
+          %% pid() - Client pid (note not the same as "From")
+          latest_ctrl_response = "" :: string(),
+          owner = undefined :: undefined | term(),
+          client = undefined :: undefined | gen_server:from(), % "From" to be used in gen_server:reply/2
+          %% Function that activated a connection and maybe some
+          %% data needed further on.
+          caller = undefined :: term(),
+          ipfamily :: inet:address_family() | inet6fb4,
+          sockopts_ctrl = [] :: list(),
+          sockopts_data_passive = [] :: list(),
+          sockopts_data_active = []  :: list(),
+          progress = ignore :: ignore | pid(),
+          dtimeout = ?DATA_ACCEPT_TIMEOUT :: non_neg_integer() | infinity,
+          tls_ctrl_session_reuse = false :: boolean(),
+          tls_upgrading_data_connection = false :: boolean() | atom() | tuple(),
+          ftp_extension = ?FTP_EXT_DEFAULT :: boolean()
+         }).
+
+-record(recv_chunk_closing, {
+          dconn_closed = false,
+          pos_compl_received = false,
+          client_called_us = false
+         }).
+
+
+-type shortage_reason()  :: 'etnospc' | 'epnospc'.
+-type restriction_reason() :: 'epath' | 'efnamena' | 'elogin' | 'enotbinary'.
+-type common_reason() ::  'econn' | 'eclosed' | term().
+-type file_write_error_reason() :: file:posix() | badarg | terminated. % See file:write for more info
+
+
+%% This should be made an internal function when we remove the deprecation
+%% ftp client processes should always be part of ftp supervisor tree.
+%% We consider it a bug that the "standalone" concept of inets was
+%% not removed when ftp was broken out, and it is now fixed.
+-spec start_service(ServiceConfig) -> {ok, Pid} | {error, Reason} when
+      ServiceConfig :: [{Property, Value}],
+      Property :: proplists:property(),
+      Value :: term(),
+      Pid :: pid(),
+      Reason :: term().
+start_service(Options) ->
+    try
+        {ok, StartOptions} = start_options(Options),
+        case ftp_sup:start_child([[[{client, self()} | StartOptions], []]]) of
+            {ok, Pid} ->
+                call(Pid, {open, ip_comm, Options}, plain);
+            Error1 ->
+                Error1
+        end
+    catch
+        throw:Error2 ->
+            Error2
+    end.
+
+-spec open(Host :: string() | inet:ip_address()) ->
+    {'ok', Pid :: pid()} | {'error', Reason :: 'ehost' | term()}.
+
+open(Host) ->
+    open(Host, []).
+
+-spec open(Host :: string() | inet:ip_address(), Opts) ->
+    {'ok', Pid :: pid()} | {'error', Reason :: 'ehost' | term()} when
+      Opts :: [Opt],
+      Opt :: StartOption | OpenOption,
+      StartOption :: {verbose, Verbose} | {debug, Debug},
+      Verbose :: boolean(),
+      Debug :: disable | debug | trace,
+      OpenOption :: {ipfamily, IpFamily} | {port, Port :: port()} | {mode, Mode}
+                    | {tls, TLSOptions :: [ssl:tls_option()]} | {tls_sec_method, TLSSecMethod :: ftps | ftpes}
+                    | {tls_ctrl_session_reuse, TLSSessionReuse :: boolean() } | {timeout, Timeout :: timeout()}
+                    | {dtimeout, DTimeout :: timeout()} | {progress, Progress} | {sock_ctrl, SocketCtrls}
+                    | {sock_data_act, [SocketControl]} | {sock_data_pass, [SocketControl]},
+      SocketCtrls :: [SocketControl],
+      IpFamily :: inet | inet6 | inet6fb4,
+      Mode :: active | passive,
+      Module :: atom(),
+      Function :: atom(),
+      InitialData :: term(),
+      Progress :: ignore | {Module, Function, InitialData},
+      SocketControl :: gen_tcp:option().
+%% <BACKWARD-COMPATIBILLITY>
+open(Host, Port) when is_integer(Port) ->
+    open(Host, [{port, Port}]);
+%% </BACKWARD-COMPATIBILLITY>
+
+open(Host, Options) when is_list(Options) ->
+    start_service([{host,Host}|Options]).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Login with or without a supplied account name.
+%%--------------------------------------------------------------------------
+-spec user(Pid  :: pid(),
+           User :: string(),
+           Pass :: string()) ->
+    'ok' | {'error', Reason :: 'euser' | common_reason()}.
+
+user(Pid, User, Pass) ->
+    case {is_name_sane(User), is_name_sane(Pass)} of
+        {true, true} ->
+            call(Pid, {user, User, Pass}, atom);
+        _ ->
+            {error, euser}
+    end.
+
+-spec user(Pid  :: pid(),
+           User :: string(),
+           Pass :: string(),
+           Account  :: string()) ->
+    'ok' | {'error', Reason :: 'euser' | common_reason()}.
+
+user(Pid, User, Pass, Account) ->
+    case {is_name_sane(User), is_name_sane(Pass), is_name_sane(Account)} of
+        {true, true, true} ->
+            call(Pid, {user, User, Pass, Account}, atom);
+        _ ->
+            {error, euser}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Set a user Account.
+%%--------------------------------------------------------------------------
+
+-spec account(Pid :: pid(), Acc :: string()) ->
+    'ok' | {'error', Reason :: 'eacct' | common_reason()}.
+
+account(Pid, Acc) ->
+    case is_name_sane(Acc) of
+        true ->
+            call(Pid, {account, Acc}, atom);
+        _ ->
+            {error, eacct}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Get the current working directory at remote server.
+%%--------------------------------------------------------------------------
+
+-spec pwd(Pid :: pid()) ->
+    {'ok', Dir :: string()} |
+        {'error', Reason :: restriction_reason() | common_reason()}.
+
+pwd(Pid) ->
+    call(Pid, pwd, ctrl).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Get the current working directory at local server.
+%%--------------------------------------------------------------------------
+
+-spec lpwd(Pid :: pid()) ->
+    {'ok', Dir :: string()}.
+
+lpwd(Pid) ->
+    call(Pid, lpwd, string).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Change current working directory at remote server.
+%%--------------------------------------------------------------------------
+
+-spec cd(Pid :: pid(), Dir :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+cd(Pid, Dir) ->
+    case is_name_sane(Dir) of
+        true ->
+            call(Pid, {cd, Dir}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Change current working directory for the local client.
+%%--------------------------------------------------------------------------
+
+-spec lcd(Pid :: pid(), Dir :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason()}.
+
+lcd(Pid, Dir) ->
+    call(Pid, {lcd, Dir}, string).
+
+
+%%--------------------------------------------------------------------------
+%% Description: Returns a list of files in long format.
+%%--------------------------------------------------------------------------
+
+-spec ls(Pid :: pid(), Dir :: string()) ->
+    {'ok', Listing :: string()} |
+        {'error', Reason ::  restriction_reason() | common_reason()}.
+
+ls(Pid, Dir) ->
+    case is_name_sane(Dir) of
+        true ->
+            call(Pid, {dir, long, Dir}, string);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Returns a list of files in short format
+%%--------------------------------------------------------------------------
+
+-spec nlist(Pid :: pid(), Pathname :: string()) ->
+    {'ok', Listing :: string()} |
+        {'error', Reason :: restriction_reason() | common_reason()}.
+
+nlist(Pid, Dir) ->
+    case is_name_sane(Dir) of
+        true ->
+            call(Pid, {dir, short, Dir}, string);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Rename a file at remote server.
+%%--------------------------------------------------------------------------
+
+-spec rename(Pid :: pid(), Old :: string(), New :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+rename(Pid, Old, New) ->
+    case {is_name_sane(Old), is_name_sane(New)} of
+        {true, true} ->
+            call(Pid, {rename, Old, New}, string);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Remove file at remote server.
+%%--------------------------------------------------------------------------
+
+-spec delete(Pid :: pid(), File :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+delete(Pid, File) ->
+    case is_name_sane(File) of
+        true ->
+            call(Pid, {delete, File}, string);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Make directory at remote server.
+%%--------------------------------------------------------------------------
+
+-spec mkdir(Pid :: pid(), Dir :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+mkdir(Pid, Dir) ->
+    case is_name_sane(Dir) of
+        true ->
+            call(Pid, {mkdir, Dir}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Remove directory at remote server.
+%%--------------------------------------------------------------------------
+
+-spec rmdir(Pid :: pid(), Dir :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+rmdir(Pid, Dir) ->
+    case is_name_sane(Dir) of
+        true ->
+            call(Pid, {rmdir, Dir}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Set transfer type.
+%%--------------------------------------------------------------------------
+
+-spec type(Pid :: pid(), Type :: ascii | binary) ->
+    'ok' |
+        {'error', Reason :: 'etype' | restriction_reason() | common_reason()}.
+
+type(Pid, Type) ->
+    call(Pid, {type, Type}, atom).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Transfer file from remote server.
+%%--------------------------------------------------------------------------
+
+-spec recv(Pid :: pid(), RemoteFileName :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() |
+                               common_reason() |
+                               file_write_error_reason()}.
+
+recv(Pid, RemotFileName) ->
+  recv(Pid, RemotFileName, RemotFileName).
+
+-spec recv(Pid            :: pid(),
+           RemoteFileName :: string(),
+           LocalFileName  :: string()) ->
+    'ok' | {'error', Reason :: term()}.
+
+recv(Pid, RemotFileName, LocalFileName) ->
+    case is_name_sane(RemotFileName) of
+        true ->
+            call(Pid, {recv, RemotFileName, LocalFileName}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Transfer file from remote server into binary.
+%%--------------------------------------------------------------------------
+
+-spec recv_bin(Pid        :: pid(),
+               RemoteFile :: string()) ->
+    {'ok', Bin :: binary()} |
+        {'error', Reason :: restriction_reason() | common_reason()}.
+
+recv_bin(Pid, RemoteFile) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {recv_bin, RemoteFile}, bin);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Start receive of chunks of remote file.
+%%--------------------------------------------------------------------------
+
+-spec recv_chunk_start(Pid        :: pid(),
+                       RemoteFile :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+recv_chunk_start(Pid, RemoteFile) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {recv_chunk_start, RemoteFile}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Transfer file from remote server into binary in chunks
+%%--------------------------------------------------------------------------
+
+-spec recv_chunk(Pid :: pid()) ->
+    'ok' |
+        {'ok', Bin :: binary()} |
+        {'error', Reason :: restriction_reason() | common_reason()}.
+
+recv_chunk(Pid) ->
+    call(Pid, recv_chunk, atom).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Transfer file to remote server.
+%%--------------------------------------------------------------------------
+
+-spec send(Pid :: pid(), LocalFileName :: string()) ->
+    'ok' |
+        {'error', Reason :: restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+send(Pid, LocalFileName) ->
+  send(Pid, LocalFileName, LocalFileName).
+
+-spec send(Pid            :: pid(),
+           LocalFileName  :: string(),
+           RemoteFileName :: string()) ->
+    'ok' |
+        {'error', Reason :: restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+send(Pid, LocalFileName, RemotFileName) ->
+    case is_name_sane(RemotFileName) of
+        true ->
+            call(Pid, {send, LocalFileName, RemotFileName}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Transfer a binary to a remote file.
+%%--------------------------------------------------------------------------
+
+-spec send_bin(Pid :: pid(), Bin :: binary(), RemoteFile :: string()) ->
+    'ok' |
+        {'error', Reason :: restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+send_bin(Pid, Bin, RemoteFile) when is_binary(Bin) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {send_bin, Bin, RemoteFile}, atom);
+        _ ->
+            {error, efnamena}
+    end;
+send_bin(_Pid, _Bin, _RemoteFile) ->
+  {error, enotbinary}.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Start transfer of chunks to remote file.
+%%--------------------------------------------------------------------------
+
+-spec send_chunk_start(Pid :: pid(), RemoteFile :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+send_chunk_start(Pid, RemoteFile) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {send_chunk_start, RemoteFile}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Start append chunks of data to remote file.
+%%--------------------------------------------------------------------------
+
+-spec append_chunk_start(Pid :: pid(), RemoteFile :: string()) ->
+    'ok' | {'error', Reason :: restriction_reason() | common_reason()}.
+
+append_chunk_start(Pid, RemoteFile) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {append_chunk_start, RemoteFile}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Purpose:  Send chunk to remote file.
+%%--------------------------------------------------------------------------
+
+-spec send_chunk(Pid :: pid(), Bin :: binary()) ->
+    'ok' |
+        {'error', Reason :: 'echunk' |
+                            restriction_reason() |
+                            common_reason()}.
+
+send_chunk(Pid, Bin) when is_binary(Bin) ->
+    call(Pid, {transfer_chunk, Bin}, atom);
+send_chunk(_Pid, _Bin) ->
+  {error, enotbinary}.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Append chunk to remote file.
+%%--------------------------------------------------------------------------
+
+-spec append_chunk(Pid :: pid(), Bin :: binary()) ->
+    'ok' |
+        {'error', Reason :: 'echunk' |
+                            restriction_reason() |
+                            common_reason()}.
+
+append_chunk(Pid, Bin) when is_binary(Bin) ->
+    call(Pid, {transfer_chunk, Bin}, atom);
+append_chunk(_Pid, _Bin) ->
+  {error, enotbinary}.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  End sending of chunks to remote file.
+%%--------------------------------------------------------------------------
+
+-spec send_chunk_end(Pid :: pid()) ->
+    'ok' |
+        {'error', Reason :: restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+send_chunk_end(Pid) ->
+    call(Pid, chunk_end, atom).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  End appending of chunks to remote file.
+%%--------------------------------------------------------------------------
+
+-spec append_chunk_end(Pid :: pid()) ->
+    'ok' |
+        {'error', Reason :: echunk |
+                            restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+append_chunk_end(Pid) ->
+    call(Pid, chunk_end, atom).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Append the local file to the remote file
+%%--------------------------------------------------------------------------
+
+-spec append(Pid            :: pid(),
+             LocalFileName  :: string(),
+             RemoteFileName :: string()) ->
+    'ok' | {'error', Reason} when
+      Reason :: epath | elogin | etnospc | epnospc | efnamena | common_reason().
+
+append(Pid, LocalFileName, RemotFileName) ->
+    case is_name_sane(RemotFileName) of
+        true ->
+            call(Pid, {append, LocalFileName, RemotFileName}, atom);
+        _ ->
+            {error, efnamena}
+    end.
+
+
+%%--------------------------------------------------------------------------
+%% Purpose:  Append a binary to a remote file.
+%%--------------------------------------------------------------------------
+
+-spec append_bin(Pid        :: pid(),
+                 Bin        :: binary(),
+                 RemoteFile :: string()) ->
+    'ok' |
+        {'error', Reason :: restriction_reason() |
+                            common_reason() |
+                            shortage_reason()}.
+
+append_bin(Pid, Bin, RemoteFile) when is_binary(Bin) ->
+    case is_name_sane(RemoteFile) of
+        true ->
+            call(Pid, {append_bin, Bin, RemoteFile}, atom);
+        _ ->
+            {error, efnamena}
+    end;
+append_bin(_Pid, _Bin, _RemoteFile) ->
+    {error, enotbinary}.
+
+
+%%--------------------------------------------------------------------------
+%% Description: Send arbitrary ftp command.
+%%--------------------------------------------------------------------------
+
+-spec quote(Pid :: pid(), Cmd :: string()) -> [FTPLine :: string()].
+
+quote(Pid, Cmd) when is_list(Cmd) ->
+    call(Pid, {quote, Cmd}, atom).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  End the ftp session.
+%%--------------------------------------------------------------------------
+
+-spec close(Pid :: pid()) -> 'ok'.
+close(Pid) ->
+    cast(Pid, close),
+    ok.
+
+
+%%--------------------------------------------------------------------------
+%% Description:  Return diagnostics.
+%%--------------------------------------------------------------------------
+
+info(Pid) ->
+    call(Pid, info, list).
+
+
+%%--------------------------------------------------------------------------
+%% Description:  The latest received response from the server
+%%--------------------------------------------------------------------------
+
+-spec latest_ctrl_response(Pid :: pid()) -> string().
+
+latest_ctrl_response(Pid) ->
+    call(Pid, latest_ctrl_response, string).
+
+
+%%%========================================================================
+%%% gen_server callback functions
+%%%========================================================================
+
+%%-------------------------------------------------------------------------
+%% init(Args) -> {ok, State} | {ok, State, Timeout} | {stop, Reason}
+%% Description: Initiates the erlang process that manages a ftp connection.
+%%-------------------------------------------------------------------------
+init(Options) ->
+    process_flag(trap_exit, true),
+
+    %% Keep track of the client
+    {value, {client, Client}} = lists:keysearch(client, 1, Options),
+    erlang:monitor(process, Client),
+
+    %% Make sure inet is started
+    _ = inet_db:start(),
+
+    %% Where are we
+    {ok, Dir} = file:get_cwd(),
+
+    %% Maybe activate dbg
+    case key_search(debug, Options, disable) of
+        trace ->
+            dbg:tracer(),
+            dbg:p(all, [call]),
+            {ok, _} = dbg:tpl(ftp_internal, [{'_', [], [{return_trace}]}]),
+            {ok, _} = dbg:tpl(ftp_response, [{'_', [], [{return_trace}]}]),
+            {ok, _} = dbg:tpl(ftp_progress, [{'_', [], [{return_trace}]}]),
+            ok;
+        debug ->
+            dbg:tracer(),
+            dbg:p(all, [call]),
+            {ok, _} = dbg:tp(ftp_internal, [{'_', [], [{return_trace}]}]),
+            {ok, _} = dbg:tp(ftp_response, [{'_', [], [{return_trace}]}]),
+            {ok, _} = dbg:tp(ftp_progress, [{'_', [], [{return_trace}]}]),
+            ok;
+        _ ->
+            %% Keep silent
+            ok
+    end,
+
+    %% Verbose?
+    Verbose  = key_search(verbose, Options, false),
+
+    %% IpFamily?
+    IpFamily = key_search(ipfamily, Options, inet),
+
+    State    = #state{owner    = Client,
+                      verbose  = Verbose,
+                      ipfamily = IpFamily,
+                      ldir     = Dir},
+
+    %% Set process prio
+    Priority = key_search(priority, Options, low),
+    process_flag(priority, Priority),
+
+    %% And we are done
+    {ok, State}.
+
+
+%%--------------------------------------------------------------------------
+%% handle_call(Request, From, State) -> {reply, Reply, State} |
+%%                                      {reply, Reply, State, Timeout} |
+%%                                      {noreply, State}               |
+%%                                      {noreply, State, Timeout}      |
+%%                                      {stop, Reason, Reply, State}   |
+%% Description: Handle incoming requests.
+%%-------------------------------------------------------------------------
+
+%% Anyone can ask this question
+handle_call({_, info}, _, #state{verbose  = Verbose,
+                                 mode     = Mode,
+                                 timeout  = Timeout,
+                                 ipfamily = IpFamily,
+                                 csock    = Socket,
+                                 progress = Progress} = State) ->
+    {ok, {_, LocalPort}}  = sockname(Socket),
+    {ok, {Address, Port}} = peername(Socket),
+    Options = [{verbose,    Verbose},
+               {ipfamily,   IpFamily},
+               {mode,       Mode},
+               {peer,       Address},
+               {peer_port,  Port},
+               {local_port, LocalPort},
+               {timeout,    Timeout},
+               {progress,   Progress}],
+    {reply, {ok, Options}, State};
+
+handle_call({_,latest_ctrl_response}, _, #state{latest_ctrl_response=Resp} = State) ->
+    {reply, {ok,Resp}, State};
+
+%% But everything else must come from the owner
+handle_call({Pid, _}, _, #state{owner = Owner} = State) when Owner =/= Pid ->
+    {reply, {error, not_connection_owner}, State};
+
+handle_call({_, {open, ip_comm, Options}}, From, State) ->
+    {ok, Opts} = open_options(Options),
+
+    case key_search(host, Opts, undefined) of
+        undefined ->
+            {stop, normal, {error, ehost}, State};
+        Host ->
+            TLSSecMethod = key_search(tls_sec_method, Opts, undefined),
+            TLSOpts  = key_search(tls,      Opts, undefined),
+            TLSReuse = key_search(tls_ctrl_session_reuse, Opts, false),
+            Mode     = key_search(mode,     Opts, ?DEFAULT_MODE),
+            Port0    = key_search(port,     Opts, 0),
+            Port     = if Port0 == 0, TLSSecMethod == ftps -> ?FTPS_PORT; Port0 == 0 -> ?FTP_PORT; true -> Port0 end,
+            Timeout  = key_search(timeout,  Opts, ?CONNECTION_TIMEOUT),
+            DTimeout = key_search(dtimeout, Opts, ?DATA_ACCEPT_TIMEOUT),
+            Progress = key_search(progress, Opts, ignore),
+            IpFamily = key_search(ipfamily, Opts, inet),
+            FtpExt   = key_search(ftp_extension, Opts, ?FTP_EXT_DEFAULT),
+
+            {ok, {CtrlOpts, DataPassOpts, DataActOpts}} = socket_options(Options),
+
+            State2 = State#state{client   = From,
+                                 mode     = Mode,
+                                 progress = progress(Progress),
+                                 ipfamily = IpFamily,
+                                 sockopts_ctrl = CtrlOpts,
+                                 sockopts_data_passive =  DataPassOpts,
+                                 sockopts_data_active = DataActOpts,
+                                 timeout = Timeout,
+                                 dtimeout = DTimeout,
+                                 ftp_extension = FtpExt},
+
+            case setup_ctrl_connection(Host, Port, Timeout, State2) of
+                {ok, State3, WaitTimeout} when is_list(TLSOpts), TLSSecMethod == ftps ->
+                    handle_ctrl_result({tls_upgrade, TLSSecMethod},
+                                       State3#state{tls_options = TLSOpts,
+						    tls_ctrl_session_reuse = TLSReuse,
+						    timeout = WaitTimeout });
+                {ok, State3, WaitTimeout} when is_list(TLSOpts) ->
+                    {noreply, State3#state{tls_options = TLSOpts, tls_ctrl_session_reuse = TLSReuse }, WaitTimeout};
+                {ok, State3, WaitTimeout} ->
+                    {noreply, State3, WaitTimeout};
+                {error, _Reason} ->
+                    gen_server:reply(From, {error, ehost}),
+                    {stop, normal, State2#state{client = undefined}}
+            end
+    end;
+
+handle_call({_, {user, User, Password}}, From,
+            #state{csock = CSock} = State) when (CSock =/= undefined) ->
+    handle_user(User, Password, "", State#state{client = From});
+
+handle_call({_, {user, User, Password, Acc}}, From,
+            #state{csock = CSock} = State) when (CSock =/= undefined) ->
+    handle_user(User, Password, Acc, State#state{client = From});
+
+handle_call({_, {account, Acc}}, From, State)->
+    handle_user_account(Acc, State#state{client = From});
+
+handle_call({_, pwd}, From, #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("PWD", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From, caller = pwd}};
+
+handle_call({_, lpwd}, From, #state{ldir = LDir} = State) ->
+    {reply, {ok, LDir}, State#state{client = From}};
+
+handle_call({_, {cd, Dir}}, From, #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("CWD ~s", [Dir])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From, caller = cd}};
+
+handle_call({_,{lcd, Dir}}, _From, #state{ldir = LDir0} = State) ->
+    LDir = filename:absname(Dir, LDir0),
+    case file:read_file_info(LDir) of %% FIX better check that LDir is a dir.
+        {ok, _ } ->
+            {reply, ok, State#state{ldir = LDir}};
+        _  ->
+            {reply, {error, epath}, State}
+    end;
+
+handle_call({_, {dir, Len, Dir}}, {_Pid, _} = From,
+            #state{chunk = false} = State) ->
+    setup_data_connection(State#state{caller = {dir, Dir, Len},
+                                      client = From});
+handle_call({_, {rename, CurrFile, NewFile}}, From,
+            #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("RNFR ~s", [CurrFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {rename, NewFile}, client = From}};
+
+handle_call({_, {delete, File}}, {_Pid, _} = From,
+            #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("DELE ~s", [File])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From}};
+
+handle_call({_, {mkdir, Dir}}, From, #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("MKD ~s", [Dir])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From}};
+
+handle_call({_,{rmdir, Dir}}, From, #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("RMD ~s", [Dir])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From}};
+
+handle_call({_,{type, Type}}, From, #state{chunk = false} = State0) ->
+    case Type of
+        ascii ->
+            _ = send_ctrl_message(State0, mk_cmd("TYPE A", [])),
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = type, type = ascii,
+                                  client = From}};
+        binary ->
+            _ = send_ctrl_message(State0, mk_cmd("TYPE I", [])),
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = type, type = binary,
+                                  client = From}};
+        _ ->
+            {reply, {error, etype}, State0}
+    end;
+handle_call({_,{recv, RemoteFile, LocalFile}}, From,
+            #state{chunk = false, ldir = LocalDir} = State) ->
+    progress_report({remote_file, RemoteFile}, State),
+    NewLocalFile = filename:absname(LocalFile, LocalDir),
+
+    case file_open(NewLocalFile, write) of
+        {ok, Fd} ->
+            setup_data_connection(State#state{client = From,
+                                              caller =
+                                              {recv_file,
+                                               RemoteFile, Fd}});
+        {error, _What} ->
+            {reply, {error, epath}, State}
+    end;
+handle_call({_, {recv_bin, RemoteFile}}, From, #state{chunk = false} =
+            State) ->
+    setup_data_connection(State#state{caller = {recv_bin, RemoteFile},
+                                      client = From});
+handle_call({_,{recv_chunk_start, RemoteFile}}, From, #state{chunk = false}
+            = State) ->
+    setup_data_connection(State#state{caller = {start_chunk_transfer,
+                                                "RETR", RemoteFile},
+                                      client = From});
+
+handle_call({_, recv_chunk}, _, #state{chunk = false} = State) ->
+    {reply, {error, "ftp:recv_chunk_start/2 not called"}, State};
+handle_call({_, recv_chunk}, _From, #state{chunk = true,
+                                           data = Bin,
+                                           caller = #recv_chunk_closing{dconn_closed       = true,
+                                                                        pos_compl_received = true,
+                                                                        client_called_us = true
+                                                                       }
+                                          } = State0) ->
+    case Bin of
+        <<>> ->
+            {reply, ok, State0#state{caller = undefined,
+                                     chunk = false,
+                                     client = undefined}};
+        Data ->
+            {reply, Data, State0#state{caller = undefined,
+                                       chunk = false,
+                                       client = undefined}}
+    end;
+handle_call({_, recv_chunk}, _From, #state{chunk = true,
+                                           caller = #recv_chunk_closing{dconn_closed       = true,
+                                                                        pos_compl_received = true
+                                                                       }
+                                          } = State0) ->
+    %% The ftp:recv_chunk call was the last event we waited for, finnish and clean up
+    ?DBG("Data connection closed recv_chunk_closing ftp:recv_chunk, last event",[]),
+    State = activate_ctrl_connection(State0),
+    {reply, ok, State#state{caller = undefined,
+                             chunk = false,
+                             client = undefined}};
+handle_call({_, recv_chunk}, From, #state{chunk = true,
+                                          caller = #recv_chunk_closing{pos_compl_received = true
+                                                                      } = R
+                                         } = State0) ->
+    State = activate_data_connection(State0),
+    {noreply, State#state{client = From, caller = R#recv_chunk_closing{client_called_us=true}}};
+
+handle_call({_, recv_chunk}, From, #state{chunk = true,
+                                          caller = #recv_chunk_closing{} = R
+                                         } = State) ->
+    %% Waiting for more, don't care what
+    ?DBG("recv_chunk_closing ftp:recv_chunk, get more",[]),
+    {noreply, State#state{client = From, caller = R#recv_chunk_closing{client_called_us=true}}};
+
+handle_call({_, recv_chunk}, From, #state{chunk = true} = State0) ->
+    State = activate_data_connection(State0),
+    {noreply, State#state{client = From, caller = recv_chunk}};
+
+handle_call({_, {send, LocalFile, RemoteFile}}, From,
+            #state{chunk = false, ldir = LocalDir} = State) ->
+    progress_report({local_file, filename:absname(LocalFile, LocalDir)},
+                    State),
+    setup_data_connection(State#state{caller = {transfer_file,
+                                                   {"STOR",
+                                                    LocalFile, RemoteFile}},
+                                         client = From});
+handle_call({_, {append, LocalFile, RemoteFile}}, From,
+            #state{chunk = false} = State) ->
+    setup_data_connection(State#state{caller = {transfer_file,
+                                                {"APPE",
+                                                 LocalFile, RemoteFile}},
+                                      client = From});
+handle_call({_, {send_bin, Bin, RemoteFile}}, From,
+            #state{chunk = false} = State) ->
+    setup_data_connection(State#state{caller = {transfer_data,
+                                               {"STOR", Bin, RemoteFile}},
+                                      client = From});
+handle_call({_,{append_bin, Bin, RemoteFile}}, From,
+            #state{chunk = false} = State) ->
+    setup_data_connection(State#state{caller = {transfer_data,
+                                                {"APPE", Bin, RemoteFile}},
+                                      client = From});
+handle_call({_, {send_chunk_start, RemoteFile}}, From, #state{chunk = false}
+            = State) ->
+    setup_data_connection(State#state{caller = {start_chunk_transfer,
+                                                "STOR", RemoteFile},
+                                      client = From});
+handle_call({_, {append_chunk_start, RemoteFile}}, From, #state{chunk = false}
+            = State) ->
+    setup_data_connection(State#state{caller = {start_chunk_transfer,
+                                                "APPE", RemoteFile},
+                                      client = From});
+handle_call({_, {transfer_chunk, Bin}}, _, #state{chunk = true} = State) ->
+    send_data_message(State, Bin),
+    {reply, ok, State};
+
+handle_call({_, {transfer_chunk, _}}, _, #state{chunk = false} = State) ->
+    {reply, {error, echunk}, State};
+
+handle_call({_, chunk_end}, From, #state{chunk = true} = State0) ->
+    close_data_connection(State0),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From, dsock = undefined,
+                          caller = end_chunk_transfer, chunk = false}};
+
+handle_call({_, chunk_end}, _, #state{chunk = false} = State) ->
+    {reply, {error, echunk}, State};
+
+handle_call({_, {quote, Cmd}}, From, #state{chunk = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd(Cmd, [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{client = From, caller = quote}};
+
+handle_call({_, _Req}, _From, #state{csock = CSock} = State)
+  when (CSock =:= undefined) ->
+    {reply, {error, not_connected}, State};
+
+handle_call(_, _, #state{chunk = true} = State) ->
+    {reply, {error, echunk}, State};
+
+%% Catch all -  This can only happen if the application programmer writes
+%% really bad code that violates the API.
+handle_call(Request, _Timeout, State) ->
+    {stop, {'API_violation_connection_closed', Request},
+     {error, {connection_terminated, 'API_violation'}}, State}.
+
+%%--------------------------------------------------------------------------
+%% handle_cast(Request, State) -> {noreply, State} |
+%%                                {noreply, State, Timeout} |
+%%                                {stop, Reason, State}
+%% Description: Handles cast messages.
+%%-------------------------------------------------------------------------
+handle_cast({Pid, close}, #state{owner = Pid} = State) ->
+    _ = send_ctrl_message(State, mk_cmd("QUIT", [])),
+    close_ctrl_connection(State),
+    close_data_connection(State),
+    {stop, normal, State#state{csock = undefined, dsock = undefined}};
+
+handle_cast({Pid, close}, State) ->
+    Report = io_lib:format("A none owner process ~p tried to close an "
+                             "ftp connection: ~n", [Pid]),
+    error_logger:info_report(Report),
+    {noreply, State};
+
+%% Catch all -  This can only happen if the application programmer writes
+%% really bad code that violates the API.
+handle_cast(Msg, State) ->
+  {stop, {'API_violation_connection_closed', Msg}, State}.
+
+%%--------------------------------------------------------------------------
+%% handle_info(Msg, State) -> {noreply, State} | {noreply, State, Timeout} |
+%%                              {stop, Reason, State}
+%% Description: Handles tcp messages from the ftp-server.
+%% Note: The order of the function clauses is significant.
+%%--------------------------------------------------------------------------
+
+handle_info(timeout, #state{caller = open} = State) ->
+    {stop, timeout, State};
+
+handle_info(timeout, State) ->
+    {noreply, State};
+
+%%% Data socket messages %%%
+handle_info({Trpt, Socket, Data},
+            #state{dsock = {Trpt,Socket},
+                   caller = {recv_file, Fd}} = State0) when Trpt==tcp;Trpt==ssl ->
+    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State0]),
+    ok = file_write(binary_to_list(Data), Fd),
+    progress_report({binary, Data}, State0),
+    State = activate_data_connection(State0),
+    {noreply, State};
+
+handle_info({Trpt, Socket, Data}, #state{dsock = {Trpt,Socket}, client = From,
+                                        caller = recv_chunk}
+            = State) when Trpt==tcp;Trpt==ssl ->
+    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State]),
+    gen_server:reply(From, {ok, Data}),
+    {noreply, State#state{client = undefined, caller = undefined, data = <<>>}};
+
+handle_info({Trpt, Socket, Data}, #state{dsock = {Trpt,Socket}} = State0) when Trpt==tcp;Trpt==ssl ->
+    ?DBG('L~p --data ~p ----> ~s~p~n',[?LINE,Socket,Data,State0]),
+    State = activate_data_connection(State0),
+    {noreply, State#state{data = <<(State#state.data)/binary,
+                                  Data/binary>>}};
+
+handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
+                                  caller = {recv_file, Fd}} = State0)
+  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    file_close(Fd),
+    progress_report({transfer_size, 0}, State0),
+    State = activate_ctrl_connection(State0),
+    ?DBG("Data channel close",[]),
+    {noreply, State#state{dsock = undefined, data = <<>>}};
+
+handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
+                                  client = Client,
+                                  caller = recv_chunk} = State0)
+  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    ?DBG("Data channel close recv_chunk",[]),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{dsock = undefined,
+                          caller = #recv_chunk_closing{dconn_closed     =  true,
+                                                       client_called_us =  Client =/= undefined}
+                         }};
+handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket},
+                                  caller = #recv_chunk_closing{client_called_us = true,
+                                                               pos_compl_received = true} = R} = State)
+  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    %% Maybe handle unprocessed chunk message before acking final chunk
+    self() ! {Cls, Socket},
+    {noreply, State#state{caller = R#recv_chunk_closing{dconn_closed = true}}};
+
+handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket}, caller = recv_bin,
+                                         data = Data} = State0)
+  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    ?DBG("Data channel close",[]),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{dsock = undefined, data = <<>>,
+                          caller = {recv_bin, Data}}};
+
+handle_info({Cls, Socket}, #state{dsock = {Trpt,Socket}, data = Data,
+                                  caller = {handle_dir_result, Dir}}
+            = State0) when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    ?DBG("Data channel close",[]),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{dsock = undefined,
+                          caller = {handle_dir_result, Dir, Data},
+%                          data = <<?CR,?LF>>}};
+                          data = <<>>}};
+
+handle_info({Err, Socket, Reason}, #state{dsock = {Trpt,Socket},
+                                          client = From} = State)
+  when {Err,Trpt}=={tcp_error,tcp} ; {Err,Trpt}=={ssl_error,ssl} ->
+    gen_server:reply(From, {error, Reason}),
+    close_data_connection(State),
+    {noreply, State#state{dsock = undefined, client = undefined,
+                          data = <<>>, caller = undefined, chunk = false}};
+
+%%% Ctrl socket messages %%%
+handle_info({Transport, Socket, Data}, #state{csock = {Transport, Socket},
+                                              verbose = Verbose,
+                                              caller = Caller,
+                                              client = From,
+                                              ctrl_data = {BinCtrlData, AccLines,
+                                                           LineStatus}}
+            = State0) ->
+    ?DBG('--ctrl ~p ----> ~s~p~n',[Socket,<<BinCtrlData/binary, Data/binary>>,State0]),
+    case ftp_response:parse_lines(<<BinCtrlData/binary, Data/binary>>,
+                                  AccLines, LineStatus) of
+        {ok, Lines, NextMsgData} ->
+            verbose(Lines, Verbose, 'receive'),
+            CtrlResult = ftp_response:interpret(Lines),
+            case Caller of
+                quote ->
+                    gen_server:reply(From, string:tokens(Lines, [?CR, ?LF])),
+                    {noreply, State0#state{client = undefined,
+                                           caller = undefined,
+                                           latest_ctrl_response = Lines,
+                                           ctrl_data = {NextMsgData, [],
+                                                        start}}};
+                _ ->
+                    ?DBG('   ...handle_ctrl_result(~p,...) ctrl_data=~p~n',[CtrlResult,{NextMsgData, [], start}]),
+                    handle_ctrl_result(CtrlResult,
+                                       State0#state{latest_ctrl_response = Lines,
+                                                    ctrl_data =
+                                                        {NextMsgData, [], start}})
+            end;
+        {continue, CtrlData} when CtrlData =/= State0#state.ctrl_data ->
+            ?DBG('   ...Continue... ctrl_data=~p~n',[CtrlData]),
+            State1 = State0#state{ctrl_data = CtrlData},
+            State = activate_ctrl_connection(State1),
+            {noreply, State};
+        {continue, _CtrlData} ->
+            ?DBG('   ...Continue... ctrl_data=~p~n',[_CtrlData]),
+            {noreply, State0}
+    end;
+
+%% If the server closes the control channel it is
+%% the expected behavior that connection process terminates.
+handle_info({Cls, Socket}, #state{csock = {Trpt, Socket}})
+  when {Cls,Trpt}=={tcp_closed,tcp} ; {Cls,Trpt}=={ssl_closed,ssl} ->
+    exit(normal); %% User will get error message from terminate/2
+
+handle_info({Err, Socket, Reason}, _) when Err==tcp_error ; Err==ssl_error ->
+    Report =
+        io_lib:format("~p on socket: ~p  for reason: ~p~n",
+                      [Err, Socket, Reason]),
+    error_logger:error_report(Report),
+    %% If tcp does not work the only option is to terminate,
+    %% this is the expected behavior under these circumstances.
+    exit(normal); %% User will get error message from terminate/2
+
+%% Monitor messages - if the process owning the ftp connection goes
+%% down there is no point in continuing.
+handle_info({'DOWN', _Ref, _Type, _Process, normal}, State) ->
+    {stop, normal, State#state{client = undefined}};
+
+handle_info({'DOWN', _Ref, _Type, _Process, shutdown}, State) ->
+    {stop, normal, State#state{client = undefined}};
+
+handle_info({'DOWN', _Ref, _Type, _Process, timeout}, State) ->
+    {stop, normal, State#state{client = undefined}};
+
+handle_info({'DOWN', _Ref, _Type, Process, Reason}, State) ->
+    {stop, {stopped, {'EXIT', Process, Reason}},
+     State#state{client = undefined}};
+
+handle_info({'EXIT', Pid, Reason}, #state{progress = Pid} = State) ->
+    Report = io_lib:format("Progress reporting stopped for reason ~p~n",
+                           [Reason]),
+    error_logger:info_report(Report),
+    {noreply, State#state{progress = ignore}};
+
+%% Catch all - throws away unknown messages (This could happen by "accident"
+%% so we do not want to crash, but we make a log entry as it is an
+%% unwanted behaviour.)
+handle_info(Info, State) ->
+    Report = io_lib:format("ftp : ~p : Unexpected message: ~p~nState: ~p~n",
+                           [self(), Info, State]),
+    error_logger:info_report(Report),
+    {noreply, State}.
+
+%%--------------------------------------------------------------------------
+%% terminate/2 and code_change/3
+%%--------------------------------------------------------------------------
+terminate(normal, State) ->
+    %% If terminate reason =/= normal the progress reporting process will
+    %% be killed by the exit signal.
+    progress_report(stop, State),
+    do_terminate({error, econn}, State);
+terminate(Reason, State) ->
+    Report = io_lib:format("Ftp connection closed due to: ~p~n", [Reason]),
+    error_logger:error_report(Report),
+    do_terminate({error, eclosed}, State).
+
+do_terminate(ErrorMsg, State) ->
+    close_data_connection(State),
+    close_ctrl_connection(State),
+    case State#state.client of
+        undefined ->
+            ok;
+        From ->
+            gen_server:reply(From, ErrorMsg)
+    end,
+    ok.
+
+code_change(_Vsn, State1, upgrade_from_pre_5_12) ->
+    {state, CSock, DSock, Verbose, LDir, Type, Chunk, Mode, Timeout,
+     Data, CtrlData, Owner, Client, Caller, IPv6Disable, Progress} = State1,
+    IpFamily =
+        if
+            (IPv6Disable =:= true) ->
+                inet;
+            true ->
+                inet6fb4
+        end,
+    State2 = #state{csock     = CSock,
+                    dsock     = DSock,
+                    verbose   = Verbose,
+                    ldir      = LDir,
+                    type      = Type,
+                    chunk     = Chunk,
+                    mode      = Mode,
+                    timeout   = Timeout,
+                    data      = Data,
+                    ctrl_data = CtrlData,
+                    owner     = Owner,
+                    client    = Client,
+                    caller    = Caller,
+                    ipfamily  = IpFamily,
+                    progress  = Progress},
+    {ok, State2};
+
+code_change(_Vsn, State1, downgrade_to_pre_5_12) ->
+    #state{csock     = CSock,
+           dsock     = DSock,
+           verbose   = Verbose,
+           ldir      = LDir,
+           type      = Type,
+           chunk     = Chunk,
+           mode      = Mode,
+           timeout   = Timeout,
+           data      = Data,
+           ctrl_data = CtrlData,
+           owner     = Owner,
+           client    = Client,
+           caller    = Caller,
+           ipfamily  = IpFamily,
+           progress  = Progress} = State1,
+    IPv6Disable =
+        if
+            (IpFamily =:= inet) ->
+                true;
+            true ->
+                false
+        end,
+    State2 =
+        {state, CSock, DSock, Verbose, LDir, Type, Chunk, Mode, Timeout,
+         Data, CtrlData, Owner, Client, Caller, IPv6Disable, Progress},
+    {ok, State2};
+
+code_change(_Vsn, State, _Extra) ->
+    {ok, State}.
+
+
+%%%=========================================================================
+%% Start/stop
+%%%=========================================================================
+%%--------------------------------------------------------------------------
+%% start_link([Opts, GenServerOptions]) -> {ok, Pid} | {error, Reason}
+%%
+%% Description: Callback function for the ftp supervisor. It is called
+%%            : when open or legacy is called.
+%%--------------------------------------------------------------------------
+start_link([Opts, GenServerOptions]) ->
+    start_link(Opts, GenServerOptions).
+
+start_link(Opts, GenServerOptions) ->
+    case lists:keysearch(client, 1, Opts) of
+        {value, _} ->
+            %% Via the supervisor
+            gen_server:start_link(?MODULE, Opts, GenServerOptions);
+        false ->
+            Opts2 = [{client, self()} | Opts],
+            gen_server:start_link(?MODULE, Opts2, GenServerOptions)
+    end.
+
+
+%%% Stop functionality is handled by close/1
+
+%%%========================================================================
+%%% Internal functions
+%%%========================================================================
+
+%%--------------------------------------------------------------------------
+%%% Help functions to handle_call and/or handle_ctrl_result
+%%--------------------------------------------------------------------------
+%% User handling
+-spec handle_user(User, Password, Account, State) -> Result when
+      User     :: io:format(),
+      Password :: io:format(),
+      Account  :: io:format(),
+      State    :: #state{},
+      Result   :: {noreply, #state{}}.
+handle_user(User, Password, Acc, State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("USER ~s", [User])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {handle_user, Password, Acc}}}.
+
+handle_user_passwd(Password, Acc, State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("PASS ~s", [Password])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {handle_user_passwd, Acc}}}.
+
+handle_user_account(Acc, State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("ACCT ~s", [Acc])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = handle_user_account}}.
+
+
+%%--------------------------------------------------------------------------
+%% handle_ctrl_result
+%%--------------------------------------------------------------------------
+-type ctrl_status_operation() :: efnamena
+                               | elogin
+                               | enofile
+                               | epath
+                               | error
+                               | etnospc
+                               | epnospc
+                               | efnamena
+                               | econn
+                               | perm_neg_compl
+                               | pos_compl
+                               | pos_interm
+                               | pos_interm_acct
+                               | pos_prel
+                               | tls_upgrade
+                               | trans_neg_compl.
+
+-spec handle_ctrl_result(Operation, State) -> Result when
+      Operation :: {ctrl_status_operation(), atom() | string()},
+      State     :: #state{},
+      Result    :: {noreply, #state{}, integer()}
+                 | {noreply, #state{}}
+                 | {stop, normal | {error, Reason}, #state{}}
+                 | {error, term()},
+      Reason    :: term().
+handle_ctrl_result({pos_compl, _}, #state{csock = {tcp, _Socket},
+                                          tls_options = TLSOptions,
+                                          timeout = Timeout,
+                                          caller = open}
+                   = State0) when is_list(TLSOptions) ->
+    _ = send_ctrl_message(State0, mk_cmd("AUTH TLS", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State, Timeout};
+
+handle_ctrl_result({tls_upgrade, S}, #state{csock = {tcp, Socket},
+                                            tls_options = TLSOptions,
+                                            timeout = Timeout,
+                                            caller = open, client = From}
+                   = State0) when is_list(TLSOptions) ->
+    ?DBG('<--ctrl ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State0]),
+    catch ssl:start(),
+    case ssl:connect(Socket, TLSOptions, Timeout) of
+        {ok, TLSSocket} when S == ftps ->
+            State1 = State0#state{csock = {ssl,TLSSocket}},
+            State = activate_ctrl_connection(State1),
+            {noreply, State#state{tls_upgrading_data_connection = pending}, Timeout};
+        {ok, TLSSocket} ->
+            State1 = State0#state{csock = {ssl,TLSSocket}},
+            handle_ctrl_result({pos_compl, S}, State1#state{tls_upgrading_data_connection = pending});
+        {error, _} = Error ->
+            gen_server:reply(From, Error),
+            {stop, normal, State0#state{client = undefined,
+                                        caller = undefined,
+                                        tls_upgrading_data_connection = false}}
+    end;
+
+handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = pending} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("PBSZ 0", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{tls_upgrading_data_connection = {true, pbsz}}};
+
+handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = {true, pbsz}} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("PROT P", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{tls_upgrading_data_connection = {true, prot}}};
+
+handle_ctrl_result({pos_compl, _}, #state{tls_upgrading_data_connection = {true, prot},
+                                          client = From} = State) ->
+    gen_server:reply(From, {ok, self()}),
+    {noreply, State#state{client = undefined,
+                          caller = undefined,
+                          tls_upgrading_data_connection = false}};
+handle_ctrl_result({pos_compl, _}, #state{caller = open, client = From}
+                   = State) ->
+    gen_server:reply(From, {ok, self()}),
+    {noreply, State#state{client = undefined,
+                          caller = undefined }};
+handle_ctrl_result({_, Lines}, #state{caller = open} = State) ->
+    ctrl_result_response(econn, State, {error, Lines});
+
+%%--------------------------------------------------------------------------
+%% Data connection setup active mode
+handle_ctrl_result({pos_compl, _Lines},
+                   #state{mode   = active,
+                          caller = {setup_data_connection,
+                                    {LSock, Caller}}} = State) ->
+    handle_caller(State#state{caller = Caller, dsock = {lsock, LSock}});
+
+handle_ctrl_result({Status, _Lines},
+                   #state{mode   = active,
+                          caller = {setup_data_connection, {LSock, _}}}
+                   = State) ->
+    close_connection({tcp,LSock}),
+    ctrl_result_response(Status, State, {error, Status});
+
+%% Data connection setup passive mode
+handle_ctrl_result({pos_compl, Lines},
+                   #state{mode     = passive,
+                          ipfamily = inet6,
+                          client   = From,
+                          caller   = {setup_data_connection, Caller},
+                          csock    = CSock,
+                          sockopts_data_passive = SockOpts,
+                          timeout  = Timeout}
+                   = State) when is_list(Lines) ->
+    [_, PortStr | _] =  lists:reverse(string:tokens(Lines, "|")),
+    {ok, {IP, _}} = peername(CSock),
+    case connect(IP, list_to_integer(PortStr), SockOpts, Timeout, State) of
+        {ok, _, Socket} ->
+            handle_caller(State#state{caller = Caller, dsock = {tcp, Socket}});
+        {error, _Reason} = Error ->
+            gen_server:reply(From, Error),
+            {noreply, State#state{client = undefined, caller = undefined}}
+    end;
+
+handle_ctrl_result({pos_compl, Lines},
+                   #state{mode     = passive,
+                          ipfamily = inet,
+                          client   = From,
+                          caller   = {setup_data_connection, Caller},
+                          timeout  = Timeout,
+                          sockopts_data_passive = SockOpts,
+                          ftp_extension = false} = State) when is_list(Lines) ->
+
+    {_, [?LEFT_PAREN | Rest]} =
+        lists:splitwith(fun(?LEFT_PAREN) -> false; (_) -> true end, Lines),
+    {NewPortAddr, _} =
+        lists:splitwith(fun(?RIGHT_PAREN) -> false; (_) -> true end, Rest),
+    [A1, A2, A3, A4, P1, P2] =
+        lists:map(fun(X) -> list_to_integer(X) end,
+                  string:tokens(NewPortAddr, [$,])),
+    IP   = {A1, A2, A3, A4},
+    Port = (P1 * 256) + P2,
+
+    ?DBG('<--data tcp connect to ~p:~p, Caller=~p~n',[IP,Port,Caller]),
+    case connect(IP, Port, SockOpts, Timeout, State) of
+        {ok, _, Socket}  ->
+            handle_caller(State#state{caller = Caller, dsock = {tcp,Socket}});
+        {error, _Reason} = Error ->
+            gen_server:reply(From, Error),
+            {noreply,State#state{client = undefined, caller = undefined}}
+    end;
+
+handle_ctrl_result({pos_compl, Lines},
+                   #state{mode     = passive,
+                          ipfamily = inet,
+                          client   = From,
+                          caller   = {setup_data_connection, Caller},
+                          csock    = CSock,
+                          timeout  = Timeout,
+                          sockopts_data_passive = SockOpts,
+                          ftp_extension = true} = State) when is_list(Lines) ->
+
+    [_, PortStr | _] =  lists:reverse(string:tokens(Lines, "|")),
+    {ok, {IP, _}} = peername(CSock),
+
+    ?DBG('<--data tcp connect to ~p:~p, Caller=~p~n',[IP,PortStr,Caller]),
+        case connect(IP, list_to_integer(PortStr), SockOpts, Timeout, State) of
+                {ok, _, Socket} ->
+                    handle_caller(State#state{caller = Caller, dsock = {tcp, Socket}});
+                {error, _Reason} = Error ->
+                    gen_server:reply(From, Error),
+                    {noreply, State#state{client = undefined, caller = undefined}}
+    end;
+
+
+%% FTP server does not support passive mode: try to fallback on active mode
+handle_ctrl_result(_,
+                   #state{mode = passive,
+                          caller = {setup_data_connection, Caller}} = State) ->
+    setup_data_connection(State#state{mode = active, caller = Caller});
+
+
+%%--------------------------------------------------------------------------
+%% User handling
+handle_ctrl_result({pos_interm, _},
+                   #state{caller = {handle_user, PassWord, Acc}} = State) ->
+    handle_user_passwd(PassWord, Acc, State);
+handle_ctrl_result({Status, _},
+                   #state{caller = {handle_user, _, _}} = State) ->
+    ctrl_result_response(Status, State, {error, euser});
+
+%% Accounts
+handle_ctrl_result({pos_interm_acct, _},
+                   #state{caller = {handle_user_passwd, Acc}} = State)
+  when Acc =/= "" ->
+    handle_user_account(Acc, State);
+handle_ctrl_result({Status, _},
+                   #state{caller = {handle_user_passwd, _}} = State) ->
+    ctrl_result_response(Status, State, {error, euser});
+
+%%--------------------------------------------------------------------------
+%% Print current working directory
+handle_ctrl_result({pos_compl, Lines},
+                   #state{caller = pwd, client = From} = State) ->
+    Dir = pwd_result(Lines),
+    gen_server:reply(From, {ok, Dir}),
+    {noreply, State#state{client = undefined, caller = undefined}};
+
+%%--------------------------------------------------------------------------
+%% Directory listing
+handle_ctrl_result({pos_prel, _}, #state{caller = {dir, Dir}} = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State1} ->
+            State = activate_data_connection(State1),
+            {noreply, State#state{caller = {handle_dir_result, Dir}}};
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+handle_ctrl_result({pos_compl, _}, #state{caller = {handle_dir_result, ""=_CurrentDir,
+                                                    Data}, client = From}= State) ->
+    gen_server:reply(From, {ok, Data}),
+    {noreply, State#state{client = undefined,
+                          caller = undefined}};
+
+handle_ctrl_result({pos_compl, _}, #state{caller = {handle_dir_result, _Dir,
+                                                    Data}, client = From}= State) ->
+    gen_server:reply(From, {ok, Data}),
+    {noreply, State#state{client = undefined,
+                          caller = undefined}};
+
+handle_ctrl_result({pos_compl, _}=Operation, #state{caller = {handle_dir_result, Dir},
+                                                    data   = Data}= State) ->
+    handle_ctrl_result(Operation, State#state{caller = {handle_dir_result, Dir, Data}});
+
+handle_ctrl_result(S={_Status, _},
+                   #state{caller = {handle_dir_result, _, _}} = State) ->
+    %% OTP-5731, macosx
+    ctrl_result_response(S, State, {error, epath});
+
+handle_ctrl_result({Status, _}, #state{caller = cd} = State) ->
+    ctrl_result_response(Status, State, {error, Status});
+
+handle_ctrl_result(Status={epath, _}, #state{caller = {dir,_}} = State) ->
+     ctrl_result_response(Status, State, {error, epath});
+
+%%--------------------------------------------------------------------------
+%% File renaming
+handle_ctrl_result({pos_interm, _}, #state{caller = {rename, NewFile}}
+                   = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("RNTO ~s", [NewFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = rename_second_phase}};
+
+handle_ctrl_result({Status, _},
+                   #state{caller = {rename, _}} = State) ->
+    ctrl_result_response(Status, State, {error, Status});
+
+handle_ctrl_result({Status, _},
+                   #state{caller = rename_second_phase} = State) ->
+    ctrl_result_response(Status, State, {error, Status});
+
+%%--------------------------------------------------------------------------
+%% File handling - recv_bin
+handle_ctrl_result({pos_prel, _}, #state{caller = recv_bin} = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State1} ->
+            State = activate_data_connection(State1),
+            {noreply, State};
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+handle_ctrl_result({pos_compl, _}, #state{caller = {recv_bin, Data},
+                                          client = From} = State) ->
+    gen_server:reply(From, {ok, Data}),
+    close_data_connection(State),
+    {noreply, State#state{client = undefined, caller = undefined}};
+
+handle_ctrl_result({Status, _}, #state{caller = recv_bin} = State) ->
+    close_data_connection(State),
+    ctrl_result_response(Status, State#state{dsock = undefined},
+                         {error, epath});
+
+handle_ctrl_result({Status, _}, #state{caller = {recv_bin, _}} = State) ->
+    close_data_connection(State),
+    ctrl_result_response(Status, State#state{dsock = undefined},
+                         {error, epath});
+%%--------------------------------------------------------------------------
+%% File handling - start_chunk_transfer
+handle_ctrl_result({pos_prel, _}, #state{caller = start_chunk_transfer}
+                   = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State1} ->
+            State = start_chunk(State1),
+            {noreply, State};
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+%%--------------------------------------------------------------------------
+%% File handling - chunk_transfer complete
+
+handle_ctrl_result({pos_compl, _}, #state{client = From,
+                                          caller = #recv_chunk_closing{dconn_closed       = true,
+                                                                       client_called_us   = true,
+                                                                       pos_compl_received = false
+                                                                      }}
+                   = State0) when From =/= undefined ->
+    %% The pos_compl was the last event we waited for, finnish and clean up
+    ?DBG("recv_chunk_closing pos_compl, last event",[]),
+    gen_server:reply(From, ok),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = undefined,
+                          chunk = false,
+                          client = undefined}};
+
+handle_ctrl_result({pos_compl, _}, #state{caller = #recv_chunk_closing{}=R}
+                   = State0) ->
+    %% Waiting for more, don't care what
+    ?DBG("recv_chunk_closing pos_compl, wait more",[]),
+    {noreply, State0#state{caller = R#recv_chunk_closing{pos_compl_received=true}}};
+
+handle_ctrl_result({pos_compl, _}, #state{caller = undefined, chunk = true}
+                   = State0) ->
+    %% Waiting for user to call recv_chunk
+    {noreply, State0#state{caller = #recv_chunk_closing{pos_compl_received=true}}};
+
+%%--------------------------------------------------------------------------
+%% File handling - recv_file
+handle_ctrl_result({pos_prel, _}, #state{caller = {recv_file, _}} = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State1} ->
+            State = activate_data_connection(State1),
+            {noreply, State};
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+handle_ctrl_result({Status, _}, #state{caller = {recv_file, Fd}} = State) ->
+    file_close(Fd),
+    close_data_connection(State),
+    ctrl_result_response(Status, State#state{dsock = undefined},
+                         {error, epath});
+%%--------------------------------------------------------------------------
+%% File handling - transfer_*
+handle_ctrl_result({pos_prel, _}, #state{caller = {transfer_file, Fd}}
+                   = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State1} ->
+            send_file(State1, Fd);
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+handle_ctrl_result({pos_prel, _}, #state{caller = {transfer_data, Bin}}
+                   = State0) ->
+    case accept_data_connection(State0) of
+        {ok, State} ->
+            send_bin(State, Bin);
+        {error, _Reason} = Error ->
+            ctrl_result_response(error, State0, Error)
+    end;
+
+%%--------------------------------------------------------------------------
+%% Default
+handle_ctrl_result({Status, _Lines}, #state{client = From} = State)
+  when From =/= undefined ->
+    ctrl_result_response(Status, State, {error, Status});
+handle_ctrl_result(CtrlMsg, #state{caller = undefined} = State) ->
+    logger:log(info, #{protocol => ftp, unexpected_msg => CtrlMsg}),
+    {noreply, State}.
+
+%%--------------------------------------------------------------------------
+%% Help functions to handle_ctrl_result
+%%--------------------------------------------------------------------------
+
+-spec ctrl_result_response(Status, State, Error) -> Result when
+      Status :: ctrl_status_operation() | {ctrl_status_operation(), _},
+      State  :: #state{},
+      Error  :: {error, string() | Status | atom() | Reason},
+      Reason :: term(),
+      Result    :: {noreply, #state{}}
+                 | {stop, normal | {error, Reason}, #state{}}
+                 | {error, term()}.
+
+ctrl_result_response(pos_compl, #state{client = From} = State, _) ->
+    gen_server:reply(From, ok),
+    {noreply, State#state{client = undefined, caller = undefined}};
+
+ctrl_result_response(enofile, #state{client = From} = State, _) ->
+    gen_server:reply(From, {error, enofile}),
+    {noreply, State#state{client = undefined, caller = undefined}};
+
+ctrl_result_response(error, State0, {error, _Reason} = Error) ->
+    case State0#state.client of
+        undefined ->
+            {stop, Error, State0};
+        From ->
+            gen_server:reply(From, Error),
+            State = activate_ctrl_connection(State0),
+            {noreply, State}
+    end;
+
+ctrl_result_response(Status, #state{client = From} = State, _)
+  when (Status =:= etnospc)  orelse
+        (Status =:= epnospc)  orelse
+        (Status =:= efnamena) orelse
+        (Status =:= econn) ->
+    gen_server:reply(From, {error, Status}),
+    {stop, normal, State#state{client = undefined}};
+
+ctrl_result_response(_, #state{client = From} = State, ErrorMsg) ->
+    gen_server:reply(From, ErrorMsg),
+    {noreply, State#state{client = undefined, caller = undefined}}.
+
+%%--------------------------------------------------------------------------
+-spec handle_caller(State) -> Result when
+      State  :: #state{},
+      Result :: {noreply, #state{}}.
+handle_caller(#state{caller = {dir, Dir, Len}} = State0) ->
+    Cmd = case Len of
+              short -> "NLST";
+              long -> "LIST"
+          end,
+    _ = case Dir of
+            "" ->
+                send_ctrl_message(State0, mk_cmd(Cmd, ""));
+            _ ->
+                send_ctrl_message(State0, mk_cmd(Cmd ++ " ~s", [Dir]))
+        end,
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {dir, Dir}}};
+
+handle_caller(#state{caller = {recv_bin, RemoteFile}} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("RETR ~s", [RemoteFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = recv_bin}};
+
+handle_caller(#state{caller = {start_chunk_transfer, Cmd, RemoteFile}} =
+              State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = start_chunk_transfer}};
+
+handle_caller(#state{caller = {recv_file, RemoteFile, Fd}} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("RETR ~s", [RemoteFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {recv_file, Fd}}};
+
+handle_caller(#state{caller = {transfer_file, {Cmd, LocalFile, RemoteFile}},
+                     ldir = LocalDir, client = From} = State0)
+  when (is_binary(LocalFile) orelse is_list(LocalFile) orelse is_atom(LocalFile)) ->
+    case file_open(filename:absname(LocalFile, LocalDir), read) of
+        {ok, Fd} ->
+            _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = {transfer_file, Fd}}};
+        {error, _} ->
+            gen_server:reply(From, {error, epath}),
+            {noreply, State0#state{client = undefined, caller = undefined,
+                                   dsock = undefined}}
+    end;
+
+handle_caller(#state{caller = {transfer_data, {Cmd, Bin, RemoteFile}}} =
+              State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("~s ~s", [Cmd, RemoteFile])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {transfer_data, Bin}}}.
+
+%%  ----------- FTP SERVER COMMUNICATION  -------------------------
+
+%% Connect to FTP server at Host (default is TCP port 21)
+%% in order to establish a control connection.
+-spec setup_ctrl_connection(Host, Port, Timeout, State) -> Result when
+      Host    :: inet:ip_address() | inet:hostname(),
+      Port    :: inet:port_number(),
+      Timeout :: non_neg_integer(),
+      State   :: #state{},
+      Reason  :: timeout | inet:posix(),
+      Result  :: {ok, State, integer()} | {error, Reason}.
+setup_ctrl_connection(Host, Port, Timeout, #state{sockopts_ctrl = SockOpts} = State0) ->
+    MsTime = erlang:monotonic_time(),
+    case connect(Host, Port, SockOpts, Timeout, State0) of
+        {ok, IpFam, CSock} ->
+            State1 = State0#state{csock = {tcp, CSock}, ipfamily = IpFam},
+            State = activate_ctrl_connection(State1),
+            case Timeout - millisec_passed(MsTime) of
+                Timeout2 when (Timeout2 >= 0) ->
+                    {ok, State#state{caller = open}, Timeout2};
+                _ ->
+                    %% Oups: Simulate timeout
+                    {ok, State#state{caller = open}, 0}
+            end;
+        Error ->
+            Error
+    end.
+
+-spec setup_data_connection(State) -> Result when
+      State :: #state{},
+      Result :: {noreply, State}.
+setup_data_connection(#state{mode   = active,
+                             caller = Caller,
+                             csock  = CSock,
+                             sockopts_data_active = SockOpts,
+                             ftp_extension = FtpExt} = State0) ->
+    case (catch sockname(CSock)) of
+        {ok, {{_, _, _, _, _, _, _, _} = IP0, _}} ->
+            IP = proplists:get_value(ip, SockOpts, IP0),
+            {ok, LSock} =
+                gen_tcp:listen(0, [{ip, IP}, {active, false},
+                                   inet6, binary, {packet, 0} |
+                                   lists:keydelete(ip,1,SockOpts)]),
+            {ok, {_, Port}} = sockname({tcp,LSock}),
+            IpAddress = inet_parse:ntoa(IP),
+            Cmd = mk_cmd("EPRT |2|~s|~p|", [IpAddress, Port]),
+            _ = send_ctrl_message(State0, Cmd),
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = {setup_data_connection,
+                                            {LSock, Caller}}}};
+        {ok, {{_,_,_,_} = IP0, _}} ->
+            IP = proplists:get_value(ip, SockOpts, IP0),
+            {ok, LSock} = gen_tcp:listen(0, [{ip, IP}, {active, false},
+                                             binary, {packet, 0} |
+                                             lists:keydelete(ip,1,SockOpts)]),
+            {ok, Port} = inet:port(LSock),
+            _ = case FtpExt of
+                    false ->
+                        {IP1, IP2, IP3, IP4} = IP,
+                        {Port1, Port2} = {Port div 256, Port rem 256},
+                        send_ctrl_message(State0,
+                                          mk_cmd("PORT ~w,~w,~w,~w,~w,~w",
+                                                 [IP1, IP2, IP3, IP4, Port1, Port2]));
+                    true ->
+                        IpAddress = inet_parse:ntoa(IP),
+                        Cmd = mk_cmd("EPRT |1|~s|~p|", [IpAddress, Port]),
+                        send_ctrl_message(State0, Cmd)
+                end,
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = {setup_data_connection,
+                                            {LSock, Caller}}}}
+    end;
+
+setup_data_connection(#state{mode = passive, ipfamily = inet6,
+                             caller = Caller} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("EPSV", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {setup_data_connection, Caller}}};
+
+setup_data_connection(#state{mode = passive, ipfamily = inet,
+                             caller = Caller,
+                             ftp_extension = false} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("PASV", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {setup_data_connection, Caller}}};
+
+setup_data_connection(#state{mode = passive, ipfamily = inet,
+                             caller = Caller,
+                             ftp_extension = true} = State0) ->
+    _ = send_ctrl_message(State0, mk_cmd("EPSV", [])),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = {setup_data_connection, Caller}}}.
+
+-spec connect(Host, Port, SockOpts, Timeout, State) -> Result when
+      Host     :: inet:ip_address() | inet:hostname(),
+      Port     :: inet:port_number(),
+      SockOpts :: [inet:inet_backend() | gen_tcp:connect_option()],
+      Timeout :: timeout(),
+      State   :: #state{},
+      Reason  :: timeout | inet:posix(),
+      Result  :: {ok, inet:address_family(), gen_tcp:socket()} | {error, Reason}.
+connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet = IpFam}) ->
+    connect2(Host, Port, IpFam, SockOpts, Timeout);
+
+connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet6 = IpFam}) ->
+    connect2(Host, Port, IpFam, SockOpts, Timeout);
+
+connect(Host, Port, SockOpts, Timeout, #state{ipfamily = inet6fb4}) ->
+    case inet:getaddr(Host, inet6) of
+        {ok, {0, 0, 0, 0, 0, 16#ffff, _, _} = IPv6} ->
+            case inet:getaddr(Host, inet) of
+                {ok, IPv4} ->
+                    IpFam = inet,
+                    connect2(IPv4, Port, IpFam, SockOpts, Timeout);
+
+                _ ->
+                    IpFam = inet6,
+                    connect2(IPv6, Port, IpFam, SockOpts, Timeout)
+            end;
+
+        {ok, IPv6} ->
+            IpFam = inet6,
+            connect2(IPv6, Port, IpFam, SockOpts, Timeout);
+
+        _ ->
+            case inet:getaddr(Host, inet) of
+                {ok, IPv4} ->
+                    IpFam = inet,
+                    connect2(IPv4, Port, IpFam, SockOpts, Timeout);
+                Error ->
+                    Error
+            end
+    end.
+
+-spec connect2(Host, Port, IpFam, SockOpts, Timeout) -> Result when
+      Host     :: inet:socket_address() | inet:hostname(),
+      Port     :: inet:port_number(),
+      SockOpts :: [inet:inet_backend() | gen_tcp:connect_option()],
+      Timeout  :: timeout(),
+      IpFam    :: inet:address_family(),
+      Reason   :: timeout | inet:posix(),
+      Result   :: {ok, inet:address_family(), gen_tcp:socket()} | {error, Reason}.
+connect2(Host, Port, IpFam, SockOpts, Timeout) ->
+    Opts = [IpFam, binary, {packet, 0}, {active, false} | SockOpts],
+    case gen_tcp:connect(Host, Port, Opts, Timeout) of
+        {ok, Sock} ->
+            {ok, IpFam, Sock};
+        Error ->
+            Error
+    end.
+
+-spec accept_data_connection_tls_options(State) -> Result when
+      State  :: #state{},
+      Result :: [tuple()].
+accept_data_connection_tls_options(#state{ csock = {ssl,Socket}, tls_options = TO0, tls_ctrl_session_reuse = true }) ->
+	TO = lists:keydelete(reuse_sessions, 1, TO0),
+	{ok, [{session_id,SSLSessionId},{session_data,SSLSessionData}]} = ssl:connection_information(Socket, [session_id, session_data]),
+	lists:keystore(reuse_session, 1, TO, {reuse_session,{SSLSessionId,SSLSessionData}});
+accept_data_connection_tls_options(#state{ tls_options = TO }) ->
+	TO.
+
+-spec accept_data_connection(State) -> Result when
+      State  :: #state{},
+      Result :: {ok, #state{}} | {error, Reason},
+      Reason :: term().
+accept_data_connection(#state{mode     = active,
+                              dtimeout = DTimeout,
+                              tls_options = TLSOptions0,
+                              dsock    = {lsock, LSock}} = State0) ->
+    case gen_tcp:accept(LSock, DTimeout) of
+        {ok, Socket} when is_list(TLSOptions0) ->
+            gen_tcp:close(LSock),
+            TLSOptions = accept_data_connection_tls_options(State0),
+            ?DBG('<--data ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State0]),
+            case ssl:connect(Socket, TLSOptions, DTimeout) of
+                {ok, TLSSocket} ->
+                    {ok, State0#state{dsock={ssl,TLSSocket}}};
+                {error, Reason} ->
+                    {error, {ssl_connect_failed, Reason}}
+            end;
+        {ok, Socket} ->
+            gen_tcp:close(LSock),
+            {ok, State0#state{dsock={tcp,Socket}}};
+        {error, Reason} ->
+            {error, {data_connect_failed, Reason}}
+    end;
+
+accept_data_connection(#state{mode = passive,
+                              dtimeout = DTimeout,
+                              dsock = {tcp,Socket},
+                              tls_options = TLSOptions0} = State) when is_list(TLSOptions0) ->
+    TLSOptions = accept_data_connection_tls_options(State),
+    ?DBG('<--data ssl:connect(~p, ~p)~n~p~n',[Socket,TLSOptions,State]),
+    case ssl:connect(Socket, TLSOptions, DTimeout) of
+        {ok, TLSSocket} ->
+            {ok, State#state{dsock={ssl,TLSSocket}}};
+        {error, Reason} ->
+            {error, {ssl_connect_failed, Reason}}
+    end;
+accept_data_connection(#state{mode = passive} = State) ->
+    {ok,State}.
+
+-spec send_ctrl_message(State, Message) -> _ when
+      State   :: #state{},
+      Message :: [term()].
+send_ctrl_message(_S=#state{csock = Socket, verbose = Verbose}, Message) ->
+    verbose(lists:flatten(Message),Verbose,send),
+    ?DBG('<--ctrl ~p ---- ~s~p~n',[Socket,Message,_S]),
+    _ = send_message(Socket, Message).
+
+send_data_message(_S=#state{dsock = Socket}, Message) ->
+    ?DBG('<==data ~p ==== ~s~n~p~n',[Socket,Message,_S]),
+    case send_message(Socket, Message) of
+        ok ->
+            ok;
+        {error, Reason} ->
+            Report = io_lib:format("send/2 for socket ~p failed with "
+                                   "reason ~p~n", [Socket, Reason]),
+            error_logger:error_report(Report),
+            %% If tcp/ssl does not work the only option is to terminate,
+            %% this is the expected behavior under these circumstances.
+            exit(normal) %% User will get error message from terminate/2
+    end.
+
+send_message({tcp, Socket}, Message) ->
+    gen_tcp:send(Socket, Message);
+send_message({ssl, Socket}, Message) ->
+    ssl:send(Socket, Message).
+
+activate_ctrl_connection(#state{csock = CSock, ctrl_data = {<<>>, _, _}} = State) ->
+    _ = activate_connection(CSock),
+    State;
+activate_ctrl_connection(#state{csock = CSock} = State0) ->
+    _ = activate_connection(CSock),
+    %% We have already received at least part of the next control message,
+    %% that has been saved in ctrl_data, process this first.
+    {noreply, State} = handle_info({socket_type(CSock), unwrap_socket(CSock), <<>>}, State0),
+    State.
+
+activate_data_connection(#state{dsock = DSock} = State) ->
+    _ = activate_connection(DSock),
+    State.
+
+activate_connection(Socket) ->
+    case socket_type(Socket) of
+        tcp ->
+            _ = activate_connection(inet, tcp_closed, Socket);
+        ssl ->
+            _ = activate_connection(ssl, ssl_closed, Socket)
+    end.
+
+activate_connection(API, CloseTag, Socket0) ->
+    Socket = unwrap_socket(Socket0),
+    case API:setopts(Socket, [{active, once}]) of
+        ok ->
+            ok;
+        {error, _} -> %% inet can return einval instead of closed
+            self() ! {CloseTag, Socket}
+    end.
+
+ignore_return_value(_) -> ok.
+
+unwrap_socket({tcp,Socket}) -> Socket;
+unwrap_socket({ssl,Socket}) -> Socket.
+
+socket_type({tcp,_Socket}) -> tcp;
+socket_type({ssl,_Socket}) -> ssl.
+
+close_ctrl_connection(#state{csock = undefined}) -> ok;
+close_ctrl_connection(#state{csock = Socket}) -> close_connection(Socket).
+
+close_data_connection(#state{dsock = undefined}) -> ok;
+close_data_connection(#state{dsock = Socket}) -> close_connection(Socket).
+
+close_connection({lsock,Socket}) -> ignore_return_value( gen_tcp:close(Socket) );
+close_connection({tcp, Socket})  -> ignore_return_value( gen_tcp:close(Socket) );
+close_connection({ssl, Socket})  -> ignore_return_value( ssl:close(Socket) ).
+
+%%  ------------ FILE HANDLING  ----------------------------------------
+send_file(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State, Fd) ->
+    {noreply, State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, send_file, Fd}}};
+send_file(#state{client = Client}=State0, Fd) ->
+    case file_read(Fd) of
+        {ok, N, Bin} when N > 0 ->
+            send_data_message(State0, Bin),
+            progress_report({binary, Bin}, State0),
+            send_file(State0, Fd);
+        {ok, _, _} ->
+            file_close(Fd),
+            close_data_connection(State0),
+            progress_report({transfer_size, 0}, State0),
+            State = activate_ctrl_connection(State0),
+            {noreply, State#state{caller = transfer_file_second_phase,
+                                  dsock = undefined}};
+        {error, Reason} ->
+            gen_server:reply(Client, {error, Reason}),
+            {stop, normal, State0#state{client = undefined}}
+    end.
+
+file_open(File, Option) ->
+  file:open(File, [raw, binary, Option]).
+
+file_close(Fd) ->
+    ignore_return_value( file:close(Fd) ).
+
+file_read(Fd) ->
+    case file:read(Fd, ?FILE_BUFSIZE) of
+        {ok, Bytes} when is_binary(Bytes) ->
+            {ok, byte_size(Bytes), Bytes};
+        eof ->
+            {ok, 0, []};
+        Other ->
+            Other
+    end.
+
+file_write(Bytes, Fd) ->
+    file:write(Fd, Bytes).
+
+%% --------------  MISC ----------------------------------------------
+
+call(GenServer, Msg, Format) ->
+    call(GenServer, Msg, Format, infinity).
+call(GenServer, Msg, Format, Timeout) ->
+    Req = {self(), Msg},
+    case (catch gen_server:call(GenServer, Req, Timeout)) of
+        {ok, Bin} when is_binary(Bin) andalso (Format =:= string) ->
+            {ok, binary_to_list(Bin)};
+        {'EXIT', _, _} ->
+            {error, eclosed};
+        {'EXIT', _} ->
+            {error, eclosed};
+        Result ->
+            Result
+    end.
+
+cast(GenServer, Msg) ->
+    gen_server:cast(GenServer, {self(), Msg}).
+
+send_bin(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State, Bin) ->
+    State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, send_bin, Bin}};
+send_bin(State0, Bin) ->
+    send_data_message(State0, Bin),
+    close_data_connection(State0),
+    State = activate_ctrl_connection(State0),
+    {noreply, State#state{caller = transfer_data_second_phase,
+                          dsock = undefined}}.
+
+mk_cmd(Fmt, Args) ->
+    [io_lib:format(Fmt, Args)| [?CR, ?LF]]. % Deep list ok.
+
+is_name_sane([]) ->
+    true;
+is_name_sane([?CR| _]) ->
+    false;
+is_name_sane([?LF| _]) ->
+    false;
+is_name_sane([_| Rest]) ->
+    is_name_sane(Rest).
+
+pwd_result(Lines) ->
+    {_, [?DOUBLE_QUOTE | Rest]} =
+        lists:splitwith(fun(?DOUBLE_QUOTE) -> false; (_) -> true end, Lines),
+    {Dir, _} =
+        lists:splitwith(fun(?DOUBLE_QUOTE) -> false; (_) -> true end, Rest),
+    Dir.
+
+
+key_search(Key, List, Default) ->
+    case lists:keysearch(Key, 1, List) of
+        {value, {_,Val}} ->
+            Val;
+        false ->
+            Default
+    end.
+
+verbose(Lines, true, Direction) ->
+    DirStr =
+        case Direction of
+            send ->
+                "Sending: ";
+            _ ->
+                "Receiving: "
+        end,
+    Str = string:strip(string:strip(Lines, right, ?LF), right, ?CR),
+    erlang:display(DirStr++Str);
+verbose(_, false,_) ->
+    ok.
+
+progress(Options) ->
+    ftp_progress:start_link(Options).
+
+progress_report(_, #state{progress = ignore}) ->
+    ok;
+progress_report(stop, #state{progress = ProgressPid}) when is_pid(ProgressPid) ->
+    ftp_progress:stop(ProgressPid);
+progress_report({binary, Data}, #state{progress = ProgressPid}) when is_binary(Data), is_pid(ProgressPid) ->
+    ftp_progress:report(ProgressPid, {transfer_size, byte_size(Data)});
+progress_report(Report, #state{progress = ProgressPid})  when is_pid(ProgressPid) ->
+    ftp_progress:report(ProgressPid, Report).
+
+
+peername({tcp, Socket}) -> inet:peername(Socket);
+peername({ssl, Socket}) -> ssl:peername(Socket).
+
+sockname({tcp, Socket}) -> inet:sockname(Socket);
+sockname({ssl, Socket}) -> ssl:sockname(Socket).
+
+start_chunk(#state{tls_upgrading_data_connection = {true, CTRL, _}} = State) ->
+    State#state{tls_upgrading_data_connection = {true, CTRL, ?MODULE, start_chunk, undefined}};
+start_chunk(#state{client = From} = State) ->
+    gen_server:reply(From, ok),
+    State#state{chunk = true,
+                client = undefined,
+                caller = undefined}.
+
+
+%% This function extracts the start options from the
+%% Valid options:
+%%     debug,
+%%     verbose
+%%     ipfamily
+%%     priority
+%%     flags    (for backward compatibillity)
+start_options(Options) ->
+    case lists:keysearch(flags, 1, Options) of
+        {value, {flags, Flags}} ->
+            Verbose = lists:member(verbose, Flags),
+            IsTrace = lists:member(trace, Flags),
+            IsDebug = lists:member(debug, Flags),
+            DebugLevel =
+                if
+                    (IsTrace =:= true) ->
+                        trace;
+                    IsDebug =:= true ->
+                        debug;
+                    true ->
+                        disable
+                end,
+            {ok, [{verbose,  Verbose},
+                  {debug,    DebugLevel},
+                  {priority, low}]};
+        false ->
+            ValidateVerbose =
+                fun(true) -> true;
+                   (false) -> true;
+                   (_) -> false
+                end,
+            ValidateDebug =
+                fun(trace) -> true;
+                   (debug) -> true;
+                   (disable) -> true;
+                   (_) -> false
+                end,
+            ValidatePriority =
+                fun(low) -> true;
+                   (normal) -> true;
+                   (high) -> true;
+                   (_) -> false
+                end,
+            ValidOptions =
+                [{verbose,  ValidateVerbose,  false, false},
+                 {debug,    ValidateDebug,    false, disable},
+                 {priority, ValidatePriority, false, low}],
+            validate_options(Options, ValidOptions, [])
+    end.
+
+
+%% This function extracts and validates the open options from the
+%% Valid options:
+%%    mode
+%%    host
+%%    port
+%%    timeout
+%%    dtimeout
+%%    progress
+%%          ftp_extension
+
+-spec open_options([tuple()]) -> {ok, [tuple()]} | no_return().
+open_options(Options) ->
+    ValidateMode =
+        fun(active) -> true;
+           (passive) -> true;
+           (_) -> false
+        end,
+    ValidateHost =
+        fun(Host) when is_list(Host) ->
+                true;
+           (Host) when tuple_size(Host) =:= 4; tuple_size(Host) =:= 8 ->
+                true;
+           (_) ->
+                false
+        end,
+    ValidatePort =
+        fun(Port) when is_integer(Port) andalso (Port >= 0) -> true;
+           (_) -> false
+        end,
+    ValidateIpFamily =
+        fun(inet) -> true;
+           (inet6) -> true;
+           (inet6fb4) -> true;
+           (_) -> false
+        end,
+    ValidateTLS =
+        fun(TLS) when is_list(TLS) -> true;
+           (undefined) -> true;
+           (_) -> false
+        end,
+    ValidateTLSSecMethod =
+        fun(ftpes) -> true;
+           (ftps) -> true;
+           (_) -> false
+        end,
+    ValidateTLSCtrlSessionReuse =
+        fun(Reuse) when is_boolean(Reuse) -> true;
+           (_) -> false
+        end,
+    ValidateTimeout =
+        fun(Timeout) when is_integer(Timeout) andalso (Timeout >= 0) -> true;
+           (_) -> false
+        end,
+    ValidateDTimeout =
+        fun(DTimeout) when is_integer(DTimeout) andalso (DTimeout >= 0) -> true;
+           (infinity) -> true;
+           (_) -> false
+        end,
+    ValidateProgress =
+        fun(ignore) ->
+                true;
+           ({Mod, Func, _InitProgress}) when is_atom(Mod) andalso
+                                             is_atom(Func) ->
+                true;
+           (_) ->
+                false
+        end,
+        ValidateFtpExtension =
+        fun(true) -> true;
+                (false) -> true;
+                (_) -> false
+        end,
+    ValidOptions =
+        [{mode,     ValidateMode,     false, ?DEFAULT_MODE},
+         {host,     ValidateHost,     true,  ehost},
+         {port,     ValidatePort,     false, 0},
+         {ipfamily, ValidateIpFamily, false, inet},
+         {tls,      ValidateTLS,      false, undefined},
+         {tls_sec_method, ValidateTLSSecMethod, false, ftpes},
+         {tls_ctrl_session_reuse, ValidateTLSCtrlSessionReuse, false, false},
+         {timeout,  ValidateTimeout,  false, ?CONNECTION_TIMEOUT},
+         {dtimeout, ValidateDTimeout, false, ?DATA_ACCEPT_TIMEOUT},
+         {progress, ValidateProgress, false, ?PROGRESS_DEFAULT},
+         {ftp_extension, ValidateFtpExtension, false, ?FTP_EXT_DEFAULT}],
+    validate_options(Options, ValidOptions, []).
+
+%% validates socket options and set defaults
+-spec socket_options(Options :: [{atom(), [term()]}]) -> {ok, tuple()} | no_return().
+socket_options(Options) ->
+    CtrlOpts = proplists:get_value(sock_ctrl, Options, []),
+    DataActOpts = proplists:get_value(sock_data_act, Options, CtrlOpts),
+    DataPassOpts = proplists:get_value(sock_data_pass, Options, CtrlOpts),
+    case [O || O <- lists:usort(CtrlOpts++DataPassOpts++DataActOpts),
+               not valid_socket_option(O)] of
+        [] ->
+            {ok, {CtrlOpts, DataPassOpts, DataActOpts}};
+        Invalid ->
+            throw({error,{sock_opts,Invalid}})
+    end.
+
+
+valid_socket_option(inet            ) -> false;
+valid_socket_option(inet6           ) -> false;
+valid_socket_option({ipv6_v6only, _}) -> false;
+valid_socket_option({active,_}      ) -> false;
+valid_socket_option({packet,_}      ) -> false;
+valid_socket_option({mode,_}        ) -> false;
+valid_socket_option(binary          ) -> false;
+valid_socket_option(list            ) -> false;
+valid_socket_option({header,_}      ) -> false;
+valid_socket_option({packet_size,_} ) -> false;
+valid_socket_option(_) -> true.
+
+
+-spec validate_options(Options, ValidOptions, Acc) -> Result when
+      Options      :: [tuple()],
+      ValidOptions :: [tuple()],
+      Acc          :: [tuple()],
+      Result       :: {ok, [tuple()]} | no_return().
+validate_options([], [], Acc) ->
+    {ok, lists:reverse(Acc)};
+validate_options([], ValidOptions, Acc) ->
+    %% Check if any mandatory options are missing!
+    case [{Key, Reason} || {Key, _, true, Reason} <- ValidOptions] of
+        [] ->
+            Defaults =
+                [{Key, Default} || {Key, _, _, Default} <- ValidOptions],
+            {ok, lists:reverse(Defaults ++ Acc)};
+        [{_, Reason}|_Missing] ->
+            throw({error, Reason})
+    end;
+validate_options([{Key, Value}|Options], ValidOptions, Acc) ->
+    case lists:keysearch(Key, 1, ValidOptions) of
+        {value, {Key, Validate, _, Default}} ->
+            case (catch Validate(Value)) of
+                true ->
+                    NewValidOptions = lists:keydelete(Key, 1, ValidOptions),
+                    validate_options(Options, NewValidOptions,
+                                     [{Key, Value} | Acc]);
+                _ ->
+                    NewValidOptions = lists:keydelete(Key, 1, ValidOptions),
+                    validate_options(Options, NewValidOptions,
+                                     [{Key, Default} | Acc])
+            end;
+        false ->
+            validate_options(Options, ValidOptions, Acc)
+    end;
+validate_options([_|Options], ValidOptions, Acc) ->
+    validate_options(Options, ValidOptions, Acc).
+
+%% Help function, elapsed milliseconds since T0
+millisec_passed(T0) ->
+    %% OTP 18
+    erlang:convert_time_unit(erlang:monotonic_time() - T0,
+                             native,
+                             micro_seconds) div 1000.
diff --git a/lib/ftp/src/ftp_sup.erl b/lib/ftp/src/ftp_sup.erl
index f30046802f..51a88e6a6c 100644
--- a/lib/ftp/src/ftp_sup.erl
+++ b/lib/ftp/src/ftp_sup.erl
@@ -61,7 +61,7 @@ init(_) ->
 %%====================================================================
 child_specs() ->
     [#{id => undefined,
-       start => {ftp, start_link, []},
+       start => {ftp_internal, start_link, []},
        restart => temporary,
        shutdown => 4000,
        type => worker,
diff --git a/lib/ftp/test/ftp_SUITE.erl b/lib/ftp/test/ftp_SUITE.erl
index 9239d18f74..843cd38b8a 100644
--- a/lib/ftp/test/ftp_SUITE.erl
+++ b/lib/ftp/test/ftp_SUITE.erl
@@ -1078,10 +1078,10 @@ error_datafail(Config) ->
     % and erlang:group_leader/2 does not work under ct
     dbg:start(),
     dbg:tracer(process, {fun
-        ({trace,P,call,{ftp,verbose,[M,_,'receive']}}, ok) when P == Pid -> Self ! M, ok;
+        ({trace,P,call,{ftp_internal,verbose,[M,_,'receive']}}, ok) when P == Pid -> Self ! M, ok;
         (_, ok) -> ok
     end, ok}),
-    dbg:tpl(ftp, verbose, []),
+    dbg:tpl(ftp_internal, verbose, []),
     dbg:p(Pid, [call]),
     {error,_} = ftp:ls(Pid),
     dbg:stop_clear(),
-- 
2.35.3

Places

File 3252-ftp-create-internal-typed-api.patch of Package erlang (Revision 44321c08784c0bcdc6b5f65725943eda)

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