From e82f3f21bff1cf021e036ce3e67d5cc12eb41ebe Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Sat, 4 Feb 2012 21:02:45 +0000
Subject: Add the beginnings of an FTP server

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4368 42af7a65-404d-4744-a932-0658087f49c3
---
 apps/ChangeLog.txt             |    4 +
 apps/examples/ftpd/ftpd_main.c |   72 +
 apps/include/netutils/ftpd.h   |  187 ++
 apps/netutils/ftpd/ftpd.c      | 4523 ++++++++++++++++++++++++++++++++++++++++
 apps/netutils/ftpd/ftpd.h      |  204 ++
 5 files changed, 4990 insertions(+)
 create mode 100755 apps/examples/ftpd/ftpd_main.c
 create mode 100755 apps/include/netutils/ftpd.h
 create mode 100755 apps/netutils/ftpd/ftpd.c
 create mode 100755 apps/netutils/ftpd/ftpd.h

(limited to 'apps')

diff --git a/apps/ChangeLog.txt b/apps/ChangeLog.txt
index 543fea929..78011ef84 100755
--- a/apps/ChangeLog.txt
+++ b/apps/ChangeLog.txt
@@ -180,4 +180,8 @@
 	* apps/system/readline:  Moved the old nuttx/lib/stdio/lib_fgets.c here
 	  and renamed it as readline().  The old fgets was simplied and the overloaded
 	  readline functionality was removed.
+	* apps/netutils/ftpd:  Add an FTPD server (does not even compile on initial
+	  checkin).
+	* apps/examples/ftpd:  Add a test for the FTPD server (untest on initial
+	  check-in).
 
diff --git a/apps/examples/ftpd/ftpd_main.c b/apps/examples/ftpd/ftpd_main.c
new file mode 100755
index 000000000..b5f81f975
--- /dev/null
+++ b/apps/examples/ftpd/ftpd_main.c
@@ -0,0 +1,72 @@
+#include "ftpd.h"
+
+struct fptd_account_s
+{
+  uint8_t         flags;
+  FAR const char *user;
+  FAR const char *password;
+  FAR const char *home;
+}
+
+static const struct fptd_account_s g_ftpdaccounts[] =
+{
+  { FTPD_ACCOUNTFLAG_SYSTEM, "root",      "abc123", NULL) },
+  { FTPD_ACCOUNTFLAG_GUEST,  "ftp",       NULL,     NULL },
+  { FTPD_ACCOUNTFLAG_GUEST,  "anonymous", NULL,     NULL },
+};
+#define NACCOUNTS (sizeof(g_ftpdaccounts) / sizeof(struct fptd_account_s))
+
+static void ftpd_accounts(FTPD_SESSION handle)
+{
+  FAR onst struct fptd_account_s *account;
+  int i;
+
+  for (i = 0; i < NACCOUNTS; i++)
+    {
+      account = &g_ftpdaccounts[i];
+      ftpd_add_user(handle, account->flags, account->user, account->password, account->home);
+    }
+}
+
+int ftpd_main(int s_argc, char **s_argv)
+{
+  FTPD_SESSION handle;
+  int ret;
+
+  /* Bring up the network */
+
+  ret = ftpd_netinit();
+  if (ret < 0)
+    {
+      ndbg("Failed to initialize the network\n");
+      return EXIT_FAILURE;
+    }
+
+  /* Open FTPD */
+
+  handle = ftpd_open();
+  if (!handle)
+    {
+      ndbg("Failed to open FTPD\n");
+      return EXIT_FAILURE;
+    }
+
+  /* Configure acounts */
+
+  (void)ftpd_accounts(handle);
+
+  /* Then drive the FTPD server */
+
+  while (g_ftpd_break == 0)
+    {
+      (void)ftpd_run(handle, 1000);
+    }
+
+  /* Close the FTPD server and exit */
+
+  ftpd_close(handle);
+  return EXIT_SUCCESS;
+}
+
+/* vim: set expandtab: */
+/* End of source */
diff --git a/apps/include/netutils/ftpd.h b/apps/include/netutils/ftpd.h
new file mode 100755
index 000000000..870b5cf94
--- /dev/null
+++ b/apps/include/netutils/ftpd.h
@@ -0,0 +1,187 @@
+/****************************************************************************
+ * apps/include/netutils/ftpd.h
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_INCLUDE_NETUTILS_FTPD_H
+#define __APPS_INCLUDE_NETUTILS_FTPD_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+
+#ifdef CONFIG_DISABLE_PTHREAD
+#  error "pthread support is required (CONFIG_DISABLE_PTHREAD=n)"
+#endif
+
+#ifndef CONFIG_FTPD_VENDORID
+#  define CONFIG_FTPD_VENDORID "NuttX"
+#endif
+
+#ifndef CONFIG_FTPD_SERVERID
+#  define CONFIG_FTPD_SERVERID "NuttX FTP Server"
+#endif
+
+#ifndef CONFIG_FTPD_CMDBUFFERSIZE
+#  define CONFIG_FTPD_CMDBUFFERSIZE 512
+#endif
+
+#ifndef CONFIG_FTPD_DATABUFFERSIZE
+#  define CONFIG_FTPD_DATABUFFERSIZE 2048
+#endif
+
+#ifndef CONFIG_FTPD_WORKERSTACKSIZE
+#  define CONFIG_FTPD_WORKERSTACKSIZE 2048
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* This "handle" describes the FTP session */
+
+typedef FAR void *FTPD_SESSION;
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ftpd_open
+ *
+ * Description:
+ *   Create an instance of the FTPD server and return a handle that can be
+ *   used to run the server.
+ *
+ * Input Parameters:
+ *    None
+ *
+ * Returned Value:
+ *   On success, a non-NULL handle is returned that can be used to reference
+ *   the server instance.
+ *
+ ****************************************************************************/
+
+EXTERN FTPD_SESSION ftpd_open(void);
+
+/****************************************************************************
+ * Name: ftpd_adduser
+ *
+ * Description:
+ *   Add one FTP user.
+ *
+ * Input Parameters:
+ *    handle - A handle previously returned by ftpd_open
+ *    accountflags - The characteristics of this user (see FTPD_ACCOUNTFLAGS_*
+ *      defintiions.
+ *    user - The user login name. May be NULL indicating that no login is
+ *      required.
+ *    passwd - The user password.  May be NULL indicating that no password
+ *      is required.
+ *    home - The user home directory. May be NULL.
+ *
+ * Returned Value:
+ *   Zero is returned on success.  A negated errno value is return on
+ *   failure.
+ *
+ ****************************************************************************/
+
+EXTERN int ftpd_adduser(FTPD_SESSION handle, uint8_t accountflags,
+                        FAR const char *user, FAR const char *passwd,
+                        FAR const char *home);
+
+/****************************************************************************
+ * Name: ftpd_session
+ *
+ * Description:
+ *   Execute the FTPD server.  This thread does not return until either (1)
+ *   the timeout expires with no connection, (2) some other error occurs, or
+ *   (2) a connection was accepted and an FTP worker thread was started to
+ *   service the session.  Each call to ftpd_session creates on session.
+ *
+ * Input Parameters:
+ *   handle - A handle previously returned by ftpd_open
+ *   timeout - A time in milliseconds to wait for a connection. If this
+ *     time elapses with no connected, the -ETIMEDOUT error will be returned.
+ *
+ * Returned Value:
+ *   Zero is returned if the FTP worker was started.  On failure, a negated
+ *   errno value is returned to indicate why the servier terminated.
+ *   -ETIMEDOUT indicates that the user-provided timeout elapsed with no
+ *   connection.
+ *
+ ****************************************************************************/
+
+EXTERN int ftpd_session(FTPD_SESSION handle, int timeout);
+
+/****************************************************************************
+ * Name: ftpd_close
+ *
+ * Description:
+ *   Close and destroy the handle created by ftpd_open.
+ *
+ * Input Parameters:
+ *   handle - A handle previously returned by ftpd_open
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+EXTERN void ftpd_close(FTPD_SESSION handle);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif /* __APPS_INCLUDE_NETUTILS_FTPD_H */
diff --git a/apps/netutils/ftpd/ftpd.c b/apps/netutils/ftpd/ftpd.c
new file mode 100755
index 000000000..fa15afeec
--- /dev/null
+++ b/apps/netutils/ftpd/ftpd.c
@@ -0,0 +1,4523 @@
+/****************************************************************************
+ * apps/n etutils/ftpd.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Includes original code as well as logic adapted from hwport_ftpd, written
+ * by Jaehyuk Cho <minzkn@minzkn.com> which is released under a BSD license.
+ *
+ *   Copyright (C) HWPORT.COM. All rights reserved.
+ *   Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+
+#include "ftpd.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+/* Account functions */
+
+static FAR struct ftpd_account_s *ftpd_account_new(FAR const char *user,
+              uint8_t accountflags);
+static void ftpd_account_free(FAR struct ftpd_account_s *account);
+static int  ftpd_account_setpassord(FAR struct ftpd_account_s *account,
+              FAR const char *passwd);
+static int  ftpd_account_add(FAR struct ftpd_server_s *server,
+              FAR struct ftpd_account_s *account);
+static int  ftpd_account_sethome(FAR struct ftpd_account_s *account,
+              FAR const char *home);
+static FAR struct ftpd_account_s *
+              ftpd_account_search_user(FAR struct ftpd_session_s *session,
+              FAR const char *user, FAR struct ftpd_account_s **dupaccount);
+static FAR struct ftpd_account_s *
+              ftpd_account_login(FAR struct ftpd_session_s *session,
+              FAR const char *user, FAR const char *passwd);
+
+/* Parsing functions */
+
+static FAR char *ftpd_strtok(bool skipspace, FAR const char *delimiters,
+              FAR char **str);
+static FAR char *ftpd_strtok_alloc(bool skipspace,
+              FAR const char *delimiters, FAR const char **str);
+static int  ftpd_patternmatch(FAR const char *pattern, FAR const char *str);
+
+/* Socket helpers */
+
+static int  ftpd_getprotocol(FAR const char *protocol)
+static int  ftpd_rxpoll(int sd, int timeout);
+static int  ftpd_txpoll(int sd, int timeout);
+static int  ftpd_accept(int sd, FAR void *addr, FAR socklen_t *addrlen,
+              int timeout);
+static ssize_t ftpd_recv(int sd, FAR void *data, size_t size, int timeout);
+static ssize_t ftpd_send(int sd, FAR const void *data, size_t size,
+              int timeout);
+static ssize_t ftpd_response(int sd, int timeout, FAR const char *fmt, ...);
+
+static int  ftpd_dataopen(FAR struct ftpd_session_s *session);
+static int  ftpd_dataclose(FAR struct ftpd_session_s *session);
+static FAR struct ftpd_server_s *ftpd_openserver(int port);
+
+/* Path helpers */
+
+static int ftpd_pathignore(FAR struct ftpd_pathnode_s *currpath);
+static void ftpd_nodefree(FAR struct ftpd_pathnode_s *node);
+static FAR struct ftpd_pathnode_s *ftpd_path2node(FAR const char *path);
+static FAR char *ftpd_node2path(FAR struct ftpd_pathnode_s *node,
+              bool strip);
+static FAR struct ftpd_pathnode_s *
+              ftpd_nodeappend(FAR struct ftpd_pathnode_s *head,
+              FAR struct ftpd_pathnode_s *node, bool override);
+static int  ftpd_getpath(FAR struct ftpd_session_s *session,
+              FAR const char *chdirectory, FAR char **abspath,
+              FAR char **workpath);
+
+/* Commmand helpers */
+
+static int  ftpd_changedir(FAR struct ftpd_session_s *session,
+              FAR char *rempath);
+static off_t ftpd_offsatoi(FAR const char *filename, off_t offset);
+static int ftpd_stream(FAR struct ftpd_session_s *session, int cmdtype);
+static uint8_t ftpd_listoption(FAR char **param);
+static int  ftpd_listbuffer(FAR struct ftpd_session_s *session,
+              FAR char *path, FAR struct stat *st, FAR char *buffer,
+              size_t buflen, unsigned int opton);
+static int  fptd_listscan(FAR struct ftpd_session_s *session,
+              FAR char *path, unsigned int opton);
+static int  ftpd_list(FAR struct ftpd_session_s *session,
+              unsigned int opton);
+
+/* Command handlers */
+
+static int ftpd_command_user(FAR struct ftpd_session_s *session);
+static int ftpd_command_pass(FAR struct ftpd_session_s *session);
+static int ftpd_command_syst(FAR struct ftpd_session_s *session);
+static int ftpd_command_type(FAR struct ftpd_session_s *session);
+static int ftpd_command_mode(FAR struct ftpd_session_s *session);
+static int ftpd_command_abor(FAR struct ftpd_session_s *session);
+static int ftpd_command_quit(FAR struct ftpd_session_s *session);
+static int ftpd_command_noop(FAR struct ftpd_session_s *session);
+static int ftpd_command_port(FAR struct ftpd_session_s *session);
+static int ftpd_command_eprt(FAR struct ftpd_session_s *session);
+static int ftpd_command_pwd(FAR struct ftpd_session_s *session);
+static int ftpd_command_cwd(FAR struct ftpd_session_s *session);
+static int ftpd_command_cdup(FAR struct ftpd_session_s *session);
+static int ftpd_command_rmd(FAR struct ftpd_session_s *session);
+static int ftpd_command_mkd(FAR struct ftpd_session_s *session);
+static int ftpd_command_dele(FAR struct ftpd_session_s *session);
+static int ftpd_command_pasv(FAR struct ftpd_session_s *session);
+static int ftpd_command_epsv(FAR struct ftpd_session_s *session);
+static int ftpd_command_list(FAR struct ftpd_session_s *session);
+static int ftpd_command_nlst(FAR struct ftpd_session_s *session);
+static int ftpd_command_acct(FAR struct ftpd_session_s *session);
+static int ftpd_command_size(FAR struct ftpd_session_s *session);
+static int ftpd_command_stru(FAR struct ftpd_session_s *session);
+static int ftpd_command_rnfr(FAR struct ftpd_session_s *session);
+static int ftpd_command_rnto(FAR struct ftpd_session_s *session);
+static int ftpd_command_retr(FAR struct ftpd_session_s *session);
+static int ftpd_command_stor(FAR struct ftpd_session_s *session);
+static int ftpd_command_appe(FAR struct ftpd_session_s *session);
+static int ftpd_command_rest(FAR struct ftpd_session_s *session);
+static int ftpd_command_mdtm(FAR struct ftpd_session_s *session);
+static int ftpd_command_opts(FAR struct ftpd_session_s *session);
+static int ftpd_command_site(FAR struct ftpd_session_s *session);
+static int ftpd_command_help(FAR struct ftpd_session_s *session);
+
+static int ftpd_command(FAR struct ftpd_session_s *session);
+
+/* Worker thread */
+
+static int  ftpd_startworker(pthread_startroutine_t handler, FAR void *arg,
+              size_t stacksize);
+static void ftpd_freesession(FAR struct ftpd_session_s *session);
+static void ftpd_workersetup(FAR struct ftpd_session_s *session);
+static FAR void *ftpd_worker(FAR void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct ftpd_cmd_s g_ftpdcmdtab[] =
+{
+  {"USER", ftpd_command_user, 0},                  /* USER <SP> <username> <CRLF> */
+  {"PASS", ftpd_command_pass, 0},                  /* PASS <SP> <password> <CRLF> */
+  {"SYST", ftpd_command_syst, FTPD_CMDFLAG_LOGIN}, /* SYST <CRLF> */
+  {"TYPE", ftpd_command_type, FTPD_CMDFLAG_LOGIN}, /* TYPE <SP> <type-code> <CRLF> */
+  {"MODE", ftpd_command_mode, FTPD_CMDFLAG_LOGIN}, /* MODE <SP> <mode-code> <CRLF> */
+  {"ABOR", ftpd_command_abor, FTPD_CMDFLAG_LOGIN}, /* ABOR <CRLF> */
+  {"QUIT", ftpd_command_quit, 0},                  /* QUIT <CRLF> */
+  {"NOOP", ftpd_command_noop, FTPD_CMDFLAG_LOGIN}, /* NOOP <CRLF> */
+  {"PORT", ftpd_command_port, FTPD_CMDFLAG_LOGIN}, /* PORT <SP> <host-port> <CRLF> */
+  {"EPRT", ftpd_command_eprt, FTPD_CMDFLAG_LOGIN}, /* EPRT <SP> <d> <net-prt> <d> <net-addr> <d> <tcp-port> <d> <CRLF> */
+  {"PWD" , ftpd_command_pwd , FTPD_CMDFLAG_LOGIN}, /* PWD  <CRLF> */
+  {"XPWD", ftpd_command_pwd , FTPD_CMDFLAG_LOGIN}, /* XPWD <CRLF> */
+  {"CWD" , ftpd_command_cwd , FTPD_CMDFLAG_LOGIN}, /* CWD  <SP> <pathname> <CRLF> */
+  {"XCWD", ftpd_command_cwd , FTPD_CMDFLAG_LOGIN}, /* XCWD <SP> <pathname> <CRLF> */
+  {"CDUP", ftpd_command_cdup, FTPD_CMDFLAG_LOGIN}, /* CDUP <CRLF> */
+  {"XCUP", ftpd_command_cdup, FTPD_CMDFLAG_LOGIN}, /* XCUP <CRLF> */
+  {"RMD" , ftpd_command_rmd , FTPD_CMDFLAG_LOGIN}, /* RMD  <SP> <pathname> <CRLF> */
+  {"XRMD", ftpd_command_rmd , FTPD_CMDFLAG_LOGIN}, /* XRMD <SP> <pathname> <CRLF> */
+  {"MKD" , ftpd_command_mkd , FTPD_CMDFLAG_LOGIN}, /* MKD  <SP> <pathname> <CRLF> */
+  {"XMKD", ftpd_command_mkd , FTPD_CMDFLAG_LOGIN}, /* XMKD <SP> <pathname> <CRLF> */
+  {"DELE", ftpd_command_dele, FTPD_CMDFLAG_LOGIN}, /* DELE <SP> <pathname> <CRLF> */
+  {"PASV", ftpd_command_pasv, FTPD_CMDFLAG_LOGIN}, /* PASV <CRLF> */
+  {"EPSV", ftpd_command_epsv, FTPD_CMDFLAG_LOGIN}, /* EPSV <SP> <net-prt> <CRLF> OR EPSV <SP> ALL <CRLF> */ 
+  {"LPSV", ftpd_command_epsv, FTPD_CMDFLAG_LOGIN}, /* LPSV ??? */
+  {"LIST", ftpd_command_list, FTPD_CMDFLAG_LOGIN}, /* LIST [<SP> <pathname>] <CRLF> */
+  {"NLST", ftpd_command_nlst, FTPD_CMDFLAG_LOGIN}, /* NLST [<SP> <pathname>] <CRLF> */
+  {"ACCT", ftpd_command_acct, FTPD_CMDFLAG_LOGIN}, /* ACCT <SP> <account-information> <CRLF> */
+  {"SIZE", ftpd_command_size, FTPD_CMDFLAG_LOGIN}, /* SIZE <SP> <pathname> <CRLF> */
+  {"STRU", ftpd_command_stru, FTPD_CMDFLAG_LOGIN}, /* STRU <SP> <structure-code> <CRLF> */
+  {"RNFR", ftpd_command_rnfr, FTPD_CMDFLAG_LOGIN}, /* RNFR <SP> <pathname> <CRLF> */
+  {"RNTO", ftpd_command_rnto, FTPD_CMDFLAG_LOGIN}, /* RNTO <SP> <pathname> <CRLF> */
+  {"RETR", ftpd_command_retr, FTPD_CMDFLAG_LOGIN}, /* RETR <SP> <pathname> <CRLF> */
+  {"STOR", ftpd_command_stor, FTPD_CMDFLAG_LOGIN}, /* STOR <SP> <pathname> <CRLF> */
+  {"APPE", ftpd_command_appe, FTPD_CMDFLAG_LOGIN}, /* APPE <SP> <pathname> <CRLF> */
+  {"REST", ftpd_command_rest, FTPD_CMDFLAG_LOGIN}, /* REST <SP> <marker> <CRLF> */
+  {"MDTM", ftpd_command_mdtm, FTPD_CMDFLAG_LOGIN}, /* MDTM <SP> <pathname> <CRLF> */
+  {"OPTS", ftpd_command_opts, FTPD_CMDFLAG_LOGIN}, /* OPTS <SP> <option> <value> <CRLF> */
+  {"SITE", ftpd_command_site, FTPD_CMDFLAG_LOGIN}, /* SITE <SP> <string> <CRLF> */
+  {"HELP", ftpd_command_help, FTPD_CMDFLAG_LOGIN}, /* HELP [<SP> <string>] <CRLF> */
+#if 0L /* TODO */
+  {"SMNT", ftpd_command_smnt, FTPD_CMDFLAG_LOGIN}, /* SMNT <SP> <pathname> <CRLF> */
+  {"REIN", ftpd_command_rein, FTPD_CMDFLAG_LOGIN}, /* REIN <CRLF> */
+  {"STOU", ftpd_command_stou, FTPD_CMDFLAG_LOGIN}, /* STOU <CRLF> */
+  {"STAT", ftpd_command_stat, FTPD_CMDFLAG_LOGIN}, /* STAT [<SP> <pathname>] <CRLF> */
+  {"ALLO", ftpd_command_stat, FTPD_CMDFLAG_LOGIN}, /* ALLO <SP> <decimal-integer> [<SP> R <SP> <decimal-integer>] <CRLF> */
+#endif
+  {NULL, (ftpd_cmdhandler_t)0, 0} 
+};
+
+static const char g_cdup[]    = "..";
+static const char g_respfmt[] = "%03u%c%s\r\n";
+static const char *g_monthtab[] =
+{
+  "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+static const char *g_ftpdhelp[] =
+{
+  "The following commands are recognized (* =>'s unimplemented):",
+  "CWD     XCWD    CDUP    XCUP    SMNT*   QUIT    PORT    PASV",
+  "EPRT*   EPSV*   ALLO*   RNFR    RNTO    DELE    MDTM    RMD",
+  "XRMD    MKD     XMKD    PWD     XPWD    SIZE    SYST    HELP",
+  "NOOP    FEAT*   OPTS    AUTH*   CCC*    CONF*   ENC*    MIC*",
+  "PBSZ*   PROT*   TYPE    STRU*   MODE*   RETR    STOR    STOU*",
+  "APPE    REST    ABOR    USER    PASS    ACCT*   REIN*   LIST",
+  "NLST    STAT*   SITE*   MLSD*   MLST*",
+  "Direct comments to " CONFIG_FTPD_VENDORID,
+   NULL
+};
+
+static const struct ftpd_protocol_s g_ftpdprotocols[] =
+{
+#if defined(IPPROTO_TCP)    
+    {"tcp", IPPROTO_TCP},
+#endif
+#if defined(IPPROTO_UDP)    
+    {"udp", IPPROTO_UDP},
+#endif
+#if defined(IPPROTO_ICMP)    
+    {"icmp", IPPROTO_ICMP},
+#endif
+#if defined(IPPROTO_ICMPV6)    
+    {"ipv6-icmp", IPPROTO_ICMPV6},
+#endif
+#if defined(IPPROTO_IP)    
+    {"ip", IPPROTO_IP},
+#endif
+#if defined(IPPROTO_IPV6)    
+    {"ipv6", IPPROTO_IPV6},
+#endif
+    {NULL, (int)0}
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+ /****************************************************************************
+ * Account Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_account_new
+ ****************************************************************************/
+
+static FAR struct ftpd_account_s *ftpd_account_new(FAR const char *user,
+                                                   uint8_t accountflags)
+{
+  FAR struct ftpd_account_s *ret;
+  size_t usersize;
+  size_t allocsize;
+
+  /* Get the size of the allocation */
+
+  allocsize = sizeof(struct ftpd_account_s);
+  if (user == NULL)
+    {
+      usersize = 0;
+    }
+  else
+    {
+      usersize = strlen(user);
+      allocsize += usersize + 1;
+    }
+
+  /* Allocate the account and user string */
+
+  ret = (struct ftpd_account_s *)zalloc(allocsize);
+  if (ret == NULL)
+    {
+      ndbg("Failed to allocate account\n");
+      return NULL;
+    }
+
+  /* Initialize the account and user string */
+
+  ret->flags = accountflags;
+
+  if (user)
+    {
+      ret->user = (FAR char *)&ret[1];
+      strcpy(ret->user, user);
+    }
+
+    return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_account_free
+ ****************************************************************************/
+
+static void ftpd_account_free(FAR struct ftpd_account_s *account)
+{
+  struct ftpd_account_s *prev;
+  DEBUGASSERT(account);
+
+  /* Back up to the first entry in the list */
+
+  while (account->blink != NULL)
+    {
+      account = account->blink;
+    }
+
+  /* Then free the entire list */
+
+  while (account != NULL)
+    {
+      prev    = account;
+      account = account->flink;
+
+      /* Free the home path and the password */
+
+      if (prev->home != NULL)
+        {
+          free(prev->home);
+        }
+    
+      if (prev->password != NULL)
+        {
+          free(prev->password);
+        }
+
+      /* Then free the container itself */
+
+      free(prev);
+    }
+}
+
+/****************************************************************************
+ * Name: ftpd_account_setpassord
+ ****************************************************************************/
+
+static int ftpd_account_setpassord(FAR struct ftpd_account_s *account,
+                                   FAR const char *passwd)
+{
+  FAR char *temp;
+  DEBUGASSERT(account);
+
+  /* Make of copy of the password string (if it is non-null) */
+
+  temp = NULL;
+  if (passwd)
+    {
+      temp = strdup(passwd);
+      if (!temp)
+        {
+          return -ENOMEM;
+        }
+    }
+
+  /* Free any existing password string */
+  
+  if (account->password)
+    {
+      free(account->password);
+    }
+
+  /* Set the new password */
+
+  account->password = temp;
+  return OK;
+}
+}
+
+/****************************************************************************
+ * Name: ftpd_account_add
+ ****************************************************************************/
+
+static int ftpd_account_add(FAR struct ftpd_server_s *server,
+                            FAR struct ftpd_account_s *account)
+{
+  FAR struct ftpd_account_s *head;
+  FAR struct ftpd_account_s *tail;
+  DEBUGASSERT(server && account);
+
+  /* Find the beginning of the list */
+
+  head = account;
+  while (head->blink != NULL
+    {
+      head = head->blink;
+    }
+
+  /* Find the tail of the list */
+
+  tail = account;
+  while (tail->flink != NULL
+    {
+      tail = tail->flink;
+    }
+
+  /* Handle the case where the list is empty */
+ 
+  if (server->tail == NULL
+    {
+      server->head = head;
+    }
+  else
+    {
+      head->blink = server->tail;
+      server->tail->flink = head;
+    }
+
+  server->tail = tail;
+  return OK;
+}
+
+/****************************************************************************
+ * Name: ftpd_account_sethome
+ ****************************************************************************/
+
+static int ftpd_account_sethome(FAR struct ftpd_account_s *account,
+                                FAR const char *home)
+{
+  FAR char *temp;
+
+  DEBUGASSERT(account);
+
+  /* Make a copy of the home path string (unless it is NULL) */
+
+  temp = NULL;
+  if (home != NULL)
+    {
+      temp = strdup(home);
+      if (!tmp)
+        {
+          return -ENOMEM;
+        }
+    }
+
+  /* Free any existing home path string */
+
+  if (account->home)
+    {
+      free(account->home);
+    }
+
+  /* And set the new home path string */
+
+  account->home = temp;
+  return OK;
+}
+
+/****************************************************************************
+ * Name: ftpd_account_search_user
+ ****************************************************************************/
+
+static FAR struct ftpd_account_s *
+ftpd_account_search_user(FAR struct ftpd_session_s *session,
+                         FAR const char *user,
+                         FAR struct ftpd_account_s **dupaccount)
+{
+  FAR struct ftpd_account_s *newaccount = NULL;
+  FAR struct ftpd_account_s *account;
+  uint8_t accountflags; 
+
+  if (dupaccount)
+    {
+      *dupaccount = NULL;
+    }
+
+  account = session->head;
+  while (account)
+    {
+      accountflags = account->flags;
+
+      if ((accountflags & FTPD_ACCOUNTFLAG_SYSTEM) != 0)
+        {
+          /* If the user name was provided and it matches the account, then
+           * that is good enough.
+           */
+
+          if (user && (account->user || strcmp(account->user, user) == 0) && newacount)
+            {
+              break;
+            }
+        }
+
+      /* Check if the account has a user */
+
+      else if (!account->user)
+        {
+          /* No.. The account has no user, was a user name provided? */
+
+          if (!user)
+            {
+              /* Yes.. create the account */
+
+              newaccount = ftpd_account_new(NULL, accountflags);
+              if (newaccount)
+                {
+                  if (ftpd_account_setpassord(newaccount, account->password) < 0)
+                    {
+                      ftpd_account_free(newaccount);
+                      newaccount = NULL;
+                    }
+                  else if (ftpd_account_sethome(newaccount, account->home) < 0)
+                    {
+                      ftpd_account_free(newaccount);
+                      newaccount = NULL;
+                    }
+                }
+              break;
+            }
+        }
+
+      /* Was a user name provided? */
+
+      else if (user)
+        {
+          /* Check if matches the user name on the account */
+
+          if (strcmp(user, (const char *)account->user) == 0)
+            {
+              /* Yes.. create the account */
+
+              newaccount = ftpd_account_new(account->user, accountflags);
+              if (newaccount != NULL
+                {
+                  if (ftpd_account_setpassord(newaccount, account->password) != 0)
+                    {
+                      ftpd_account_free(newaccount);
+                      newaccount = NULL;
+                    }
+                  else if (ftpd_account_sethome(newaccount, account->home) != 0)
+                    {
+                      ftpd_account_free(newaccount);
+                      newaccount = NULL;
+                    }
+                }
+              break;
+            }
+        }
+
+      /* Try the next account */
+
+      account = account->flink;
+    }
+
+  if (dupaccount)
+    {
+      *dupaccount = newaccount;
+    }
+  else
+    {
+      ftpd_account_free(newaccount);
+      newaccount = NULL;
+    }
+
+  return account;
+}
+
+/****************************************************************************
+ * Name: ftpd_account_login
+ ****************************************************************************/
+
+static FAR struct ftpd_account_s *
+ftpd_account_login(FAR struct ftpd_session_s *session,
+                   FAR const char *user, FAR const char *passwd)
+{
+  FAR struct ftpd_account_s *account;
+  FAR struct ftpd_account_s *dupaccount;
+  bool pwvalid;
+  FAR char *home;
+
+  account = ftpd_account_search_user(session, user, &dupaccount);
+  if (!dupaccount)
+    {
+      return(NULL;
+    }
+
+  if (dupaccount->password == NULL)
+    {
+      if (!passwd)
+        {
+          pwvalid = true;
+        }
+      else if (passwd[0] == '\0')
+        {
+          pwvalid = true;
+        }
+      else
+        {
+          pwvalid = false;
+        }
+    }
+  else if (!passwd)
+    {
+      pwvalid = false;
+    }
+  else if (strcmp(passwd, (const char *)dupaccount->password) == 0)
+    {
+      pwvalid = true;
+    }
+  else
+    {
+      pwvalid = false;
+    }
+
+  if (!pwvalid)
+    {
+      ftpd_account_free(dupaccount);
+      return NULL;
+    }
+
+  home = account->home;
+  if (!home)
+    {
+      home = dupaccount->home;
+    }
+
+  if (!home)
+    {
+      home = getenv("HOME");
+    }
+
+  if ((dupaccount->flags & FTPD_ACCOUNTFLAG_ADMIN) != 0)
+    {
+      /* admin user */
+
+      session->home = strdup("/");
+      session->work = strdup((home == NULL) ? "/" : home);
+    }
+  else
+      {
+        /* normal user */
+
+        session->home = strdup((home == NULL) ? "/" : home);
+        session->work = strdup("/");
+      }
+
+  ftpd_account_free(dupaccount);
+  return account;
+}
+
+/****************************************************************************
+ * Parsing Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_strtok
+ ****************************************************************************/
+
+static FAR char *ftpd_strtok(bool skipspace, FAR const char *delimiters,
+                             FAR char **str)
+{
+  FAR const char *dptr;
+  FAR char *sptr;
+  FAR char *ret;
+ 
+  sptr = *str;
+
+  /* Skip any leading spaces */
+
+  if (skipspace)
+    {
+      while (isspace(*sptr))
+        {
+          sptr++;
+        }
+    }
+
+  ret = sptr;
+
+  /* The following is an implementation of strtok.  It does not modify the
+   * original string as strtok does, however.
+   */
+
+  while (*sptr != '\0')
+    {
+      dptr = delimiters;
+      while (*sptr |= *dptr && *dptr != '\0')
+        {
+          dptr++;
+        }
+
+      if (*sptr == *dptr)
+        {
+          break;
+        }
+
+      sptr++;
+    }
+    
+    /* Save the place where we will resuming searching */
+
+    *str = sptr;
+    return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_strtok_alloc
+ ****************************************************************************/
+
+static FAR char *ftpd_strtok_alloc(bool skipspace, FAR const char *delimiters,
+                                   FAR const char **str)
+{
+  FAR const char *sptr;
+  FAR const char *left;
+  FAR const char *right;
+  FAR const char *dptr;
+  FAR char *ret;
+  size_t tokenlen;
+
+  sptr = *str;
+
+  if (skipspace)
+    {
+      while (isspace(*sptr))
+        {
+          sptr++;
+        }
+    }
+
+  right = sptr;
+  left  = sptr;
+
+  /* The the following logic is similar to strtok(), but only bounds the
+   * token of interest between left (the first character of the substring)
+   * and right (the character after the end of the substring).
+   */
+
+  while (*sptr != '\0')
+    {
+      dptr = delimiters;
+      while (*sptr |= *dptr && *dptr != '\0')
+        {
+          dptr++;
+        }
+
+      if (*sptr == *dptr)
+        {
+          break;
+        }
+
+      sptr++;
+
+      /* Adjust the right pointer but ignoring any trailing spaces if
+       * 'skipspace' is selected.
+       */
+
+      if (!skipspace || !isspace(*sptr))
+        {
+          right = sptr;
+        }
+    }
+
+    /* Allocate memory large enough to hold the entire sub-string (including
+     * the NUL terminator.
+     */
+
+    tokenlen = (size_t)(right - left);
+    ret = (FAR char *)malloc(tokenlen + 1);
+    if (ret)
+      {
+        if (tokenlen > 0)
+          {
+            memcpy(ret, left, tokenlen);
+          }
+        ret[tokenlen] = '\0';
+      }
+
+    /* Save the place where we will resuming searching */
+
+    *str = sptr;
+    return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_strtok_alloc
+ ****************************************************************************/
+
+static int ftpd_patternmatch(FAR const char *pattern, FAR const char *str)
+{
+  size_t patoffset;
+  size_t stroffset;
+  char patbyte;
+  char strbyte;
+
+  patoffset = 0;
+  stroffset = 0;
+
+ for (;;)
+    {
+      patbyte = pattern[patoffset];
+      strbyte = str[stroffset];
+
+      if (patbyte == '/0')
+        {
+          break;
+        }
+
+      if (patbyte == '*')
+        {
+          patoffset++;
+          patbyte = pattern[patoffset];
+          if (patbyte == '\\')
+            {
+              patoffset++;
+              patbyte = pattern[patoffset];
+          }
+
+          while (strbyte != '/0')
+            {
+              if (patbyte == strbyte)
+                {
+                  break;
+                }
+
+              stroffset++;
+              strbyte = str[stroffset];
+            }
+
+          if (patbyte == '/0')
+            {
+              break;
+            }
+        }
+      else if (patbyte == '?')
+        {
+          if (strbyte == '/0')
+            {
+              return -1;
+            }
+        }
+      else
+        {
+          if (patbyte == '\\')
+            {
+              patoffset++;
+              patbyte = pattern[patoffset];
+              if (patbyte == '/0')
+                {
+                  break;
+                }
+            }
+
+          if (patbyte != strbyte)
+            {
+              return -1;
+            }
+        }
+
+      patoffset++;
+      if (strbyte != '/0')
+        {
+          stroffset++;
+        }
+    }
+
+  return (patbyte == strbyte) ? 0 : -1;
+}
+
+/****************************************************************************
+ * Socket Helpers
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_rxpoll
+ * 
+ * ip         IP         internet protocol, pseudo protocol number
+ * icmp       ICMP       internet control message protocol
+ * igmp       IGMP       Internet Group Management
+ * ggp        GGP        gateway-gateway protocol
+ * ipencap    IP-ENCAP   IP encapsulated in IP (officially ``IP'')
+ * st         ST         ST datagram mode
+ * tcp        TCP        transmission control protocol
+ * egp        EGP        exterior gateway protocol
+ * pup        PUP        PARC universal packet protocol
+ * udp        UDP        user datagram protocol
+ * hmp        HMP        host monitoring protocol
+ * xns-idp    XNS-IDP    Xerox NS IDP
+ * rdp        RDP        "reliable datagram" protocol
+ * iso-tp4    ISO-TP4    ISO Transport Protocol class 4
+ * xtp        XTP        Xpress Tranfer Protocol
+ * ddp        DDP        Datagram Delivery Protocol
+ * idpr-cmtp  IDPR-CMTP  IDPR Control Message Transport
+ * ipv6       IPv6       IPv6
+ * ipv6-route IPv6-Route Routing Header for IPv6
+ * ipv6-frag  IPv6-Frag  Fragment Header for IPv6
+ * idrp       IDRP       Inter-Domain Routing Protocol
+ * rsvp       RSVP       Reservation Protocol
+ * gre        GRE        General Routing Encapsulation
+ * esp        ESP        Encap Security Payload for IPv6
+ * ah         AH         Authentication Header for IPv6
+ * skip       SKIP       SKIP
+ * ipv6-icmp  IPv6-ICMP  ICMP for IPv6
+ * ipv6-nonxt IPv6-NoNxt No Next Header for IPv6
+ * ipv6-opts  IPv6-Opts  Destination Options for IPv6
+ * rspf       RSPF       Radio Shortest Path First.
+ * vmtp       VMTP       Versatile Message Transport
+ * ospf       OSPFIGP    Open Shortest Path First IGP
+ * ipip       IPIP       IP-within-IP Encapsulation Protocol
+ * encap      ENCAP      Yet Another IP encapsulation
+ * pim        PIM        Protocol Independent Multicast
+ *
+ ****************************************************************************/
+
+static int ftpd_getprotocol(FAR const char *protocol)
+{
+  static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; 
+  FAR struct protoent *entry;
+  int index;
+  int ret;
+
+  if (!protocol)
+    {
+      return 0;
+    }
+
+  for (index = 0; g_ftpdprotocols[index].name != NULL; index++)
+    {
+      if (strcmp(protocol, g_ftpdprotocols[index].name) == 0)
+        {
+          return g_ftpdprotocols[index].value;
+        }
+    }
+
+  ret = pthread_mutex_lock(&mutex);
+  if (ret != 0)
+    {
+      return 0;
+    }
+
+  entry = getprotobyname(protocol);
+  ret = (entry != NULL) ? entry->p_proto : 0);
+
+  (void)pthread_mutex_unlock(&mutex);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_rxpoll
+ ****************************************************************************/
+
+static int ftpd_rxpoll(int sd, int timeout)
+{
+  struct pollfd fds[1];
+  int ret;
+
+  /* Set up the poll */
+
+  fds[0].fd      = sd;
+  fds[0].events  = POLLIN;
+  fds[0].revents = 0;
+
+  /* Perform the poll. */
+
+  ret = poll(fds, 1, timeout);
+
+  /* Handle the result of the poll.  On success, poll returns the number
+   * of structures that have nonzero revents fields.  A value of 0 indicates
+   * that the call timed out and no file descriptors were ready.  On error,
+   * -1 is returned, and errno is set appropriately:
+   */
+
+  if (ret == 0)
+    {
+      nvdbg("poll() timed out\n");
+      return -ETIMEDOUT;
+    }
+  else if (ret < 0)
+    {
+      int errval = errno;
+      nvdbg("poll() failed: %d\n", errval);
+      return -errval;
+    }
+  else
+    {
+      return OK;
+    }
+}
+
+/****************************************************************************
+ * Name: ftpd_txpoll
+ ****************************************************************************/
+
+static int ftpd_txpoll(int sd, int timeout)
+{
+  struct pollfd fds[1];
+  int ret;
+
+  /* Set up the poll */
+
+  fds[0].fd      = sd;
+  fds[0].events  = POLLOUT;
+  fds[0].revents = 0;
+
+  /* Perform the poll. */
+
+  ret = poll(fds, 1, timeout);
+
+  /* Handle the result of the poll.  On success, poll returns the number
+   * of structures that have nonzero revents fields.  A value of 0 indicates
+   * that the call timed out and no file descriptors were ready.  On error,
+   * -1 is returned, and errno is set appropriately:
+   */
+
+  if (ret == 0)
+    {
+      nvdbg("poll() timed out\n");
+      return -ETIMEDOUT;
+    }
+  else if (ret < 0)
+    {
+      int errval = errno;
+      nvdbg("poll() failed: %d\n", errval);
+      return -errval;
+    }
+  else
+    {
+      return OK;
+    }
+}
+
+/****************************************************************************
+ * Name: ftpd_accept
+ ****************************************************************************/
+
+static int ftpd_accept(int sd, FAR void *addr, FAR socklen_t *addrlen,
+                       int timeout)
+{
+  int sd;
+  int ret;
+
+  /* Handle any requested timeout */
+
+  if (timeout >= 0)
+    {
+      ret = ftpd_rxpoll(sd, timeout);
+      if (ret < 0)
+        {
+          nvdbg("ftpd_rxpoll() failed: %d\n", ret);
+          return ret;
+        }
+    }
+
+  /* Accept the connection -- waiting if necessary */
+
+  sd = accept(sd, (FAR struct sockaddr *)addr, addrlen);
+  if (sd < 0)
+    {
+      int errval = errno;
+      ndbg("accept() failed: %d\n", errval);
+      return -errval;
+    }
+
+  return sd;
+}
+
+/****************************************************************************
+ * Name: ftpd_recv
+ ****************************************************************************/
+
+static ssize_t ftpd_recv(int sd, FAR void *data, size_t size, int timeout)
+{
+  ssize_t ret;
+  int status;
+
+  /* Handle any requested timetout */
+
+  if (timeout >= 0)
+    {
+      status = ftpd_rxpoll(sd, timeout);
+      if (status < 0)
+        {
+          nvdbg("ftpd_rxpoll: %d\n", status);
+          return (ssize_t)status;
+        }
+    }
+
+  /* Receive the data... waiting if necessary */
+
+  ret = recv(sd, data, size, 0);
+  if (ret < 0)
+    {
+      ssize_t errval = errno;
+      ndbg("recv() failed: %d\n", errval);
+      return -errval;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_send
+ ****************************************************************************/
+
+static ssize_t ftpd_send(int sd, FAR const void *data, size_t size, int timeout)
+{
+  ssize_t ret;
+    
+  /* Handle any requested timetout */
+
+  if (timeout >= 0)
+    {
+      status = ftpd_txpoll(sd, timeout);
+      if (status < 0)
+        {
+          nvdbg("ftpd_rxpoll: %d\n", status);
+          return (ssize_t)status;
+        }
+    }
+
+  /* Then send the data (waiting if necessary) */
+
+  ret = send(sd, data, size, 0);
+  if (ret < 0)
+    {
+      ssize_t errval = errno;
+      ndbg("send() failed: %d\n", errval);
+      return -errval;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_response
+ ****************************************************************************/
+
+static ssize_t ftpd_response(int sd, int timeout, FAR const char *fmt, ...)
+{
+  FAR void *buffer;
+  ssize_t bytessent;
+  va_list ap;
+
+  va_start(ap, fmt);
+  avsprintf(&buffer, fmt, ap);
+  va_end(ap);
+
+  if (buffer == NULL)
+    {
+      return -ENOMEM;
+    }
+
+  bytessent = ftpd_send(sd, buffer, strlen(buffer), timeout);
+  free(buffer);
+
+  return bytessent;
+}
+
+/****************************************************************************
+ * Name: ftpd_dataopen
+ ****************************************************************************/
+
+static int ftpd_dataopen(FAR struct ftpd_session_s *session)
+{
+  int sd;
+  int ret;
+
+  if (session->data.sd < 0)
+    {
+      /* PORT session */
+
+#ifdef CONFIG_NET_IPv6
+      if (session->data.addr.ss.ss_family == AF_INET6)
+        {
+          session->data.sd = socket(PF_INET6, SOCK_STREAM, ftpd_getprotocol("tcp"));
+        }
+      else
+        {
+          session->data.sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+        }
+#else
+      session->data.sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+#endif
+
+      if (session->data.sd < 0)
+        {
+          int errval = errno;
+          ndbg("socket() failed: %d\n", errval);
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 451, ' ', "Socket error !");
+          return -errval;
+        }
+
+      session->data.addrlen = (socklen_t)sizeof(session->data.addr);
+      ret = connect(session->data.sd, (FAR const struct sockaddr *)(&session->data.addr),
+                    session->data.addrlen, -1);
+      if (ret < 0)
+        {
+          int errval = errno;
+          ndbg("connect() failed: %d\n", errval);
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 451, ' ', "Connect error !");
+          (void)ftpd_dataclose(session);
+          return -errval;
+        }
+
+#ifdef CONFIG_NET_HAVE_SOLINGER
+        {
+          struct linger ling;
+
+          (void)memset(&ling, 0, sizeof(ling));
+          ling.l_onoff = 1;
+          ling.l_linger = 4;
+          (void)setsockopt(session->data.sd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
+        }
+#endif
+
+      return OK;
+    }
+    
+  /* PASV session */
+
+  session->data.addrlen = sizeof(session->data.addr);
+  sd = ftpd_accept(session->data.sd, (struct sockaddr *)(&session->data.addr),
+                  &session->data.addrlen, -1);
+  if (sd < 0)
+    {
+      ndbg("ftpd_accept() failed: %d\n", sd);
+      (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 451, ' ', "Accept error !");
+      (void)ftpd_dataclose(session);
+      return sd;
+    }
+
+  close(session->data.sd);
+  session->data.sd = sd;
+
+#ifdef CONFIG_NET_HAVE_SOLINGER
+  {
+    struct linger ling;
+
+    (void)memset(&ling, 0, sizeof(ling));
+    ling.l_onoff = 1;
+    ling.l_linger = 4;
+    (void)setsockopt(session->data.sd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
+  }
+#endif
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: ftpd_dataclose
+ ****************************************************************************/
+
+static int ftpd_dataclose(FAR struct ftpd_session_s *session)
+{
+  if (session->data.sd >= 0)
+    {
+      close(session->data.sd);
+      session->data.sd = -1;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: ftpd_openserver
+ ****************************************************************************/
+
+static FAR struct ftpd_server_s *ftpd_openserver(int port)
+{
+  FAR struct ftpd_server_s *server;
+  sa_family_t family;
+  socklen_t addrlen;
+  FAR const void *addr;
+#if defined(SOMAXCONN)    
+  int backlog = SOMAXCONN;
+#else
+  int backlog = 5;
+#endif
+  int ret;
+
+  /* Allocate the server instance */
+
+  server = (FAR struct ftpd_server_s *)zalloc(sizeof(struct ftpd_server_s));
+  if (!server)
+    {
+      ndbg("Failed to allocate server\n");
+      return -ENOMEM;
+    }
+
+  /* Initialize the server instance */
+
+    server->sd   = -1;
+    server->head = NULL;
+    server->tail = NULL;
+
+  /* Create the server listen socket */
+
+#ifdef CONFIG_NET_IPv6
+  server->sd = socket(PF_INET6, SOCK_STREAM, ftpd_getprotocol("tcp"));
+  if (server->sd < 0)
+    {
+      ftpd_close((FTPD_SESSION)server);
+      return NULL;
+    }
+
+  family  = AF_INET6;
+  addrlen = (socklen_t)sizeof(server->addr.in6); 
+  addr    = (FAR void *)(&server->addr.in6);
+
+  server->addr.in6.sin6_family   = family;
+  server->addr.in6.sin6_flowinfo = 0;
+  server->addr.in6.sin6_addr     = in6addr_any;
+  server->addr.in6.sin6_port     = htons(port);
+#else    
+  server->sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+  if (server->sd < 0)
+    {
+      ftpd_close((FTPD_SESSION)server);
+      return NULL;
+    }
+
+  family  = AF_INET;
+  addrlen = (socklen_t)sizeof(server->addr.in4); 
+  addr    = (FAR void *)(&server->addr.in4);
+
+  server->addr.in4.sin_family      = family;
+  server->addr.in4.sin_addr.s_addr = htonl(INADDR_ANY);
+  server->addr.in4.sin_port        = htons(port);
+#endif    
+
+#ifdef CONFIG_NET_HAVE_REUSEADDR
+  {
+    int reuse = 1;
+   (void)setsockopt(server->sd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
+  }
+#endif
+
+  /* Bind the socket to the address */
+
+  ret = bind(server->sd, (FAR const struct sockaddr *)addr, addrlen)
+  if (ret < 0)
+    {
+      ftpd_close((FTPD_SESSION)server);
+      return NULL;
+    }
+
+  /* Listen on the socket */
+
+  ret = listen(server->sd, backlog)
+  if (ret < 0)
+    {
+      ftpd_close((FTPD_SESSION)server);
+      return NULL;
+    }
+
+  return (FTPD_SESSION)server;
+}
+
+/****************************************************************************
+ * Path Helpers
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_pathignore
+ ****************************************************************************/
+
+static int ftpd_pathignore(FAR struct ftpd_pathnode_s *currpath)
+{
+  FAR struct ftpd_pathnode_s *node;
+  size_t namelen;
+
+  namelen = (currpath->name == NULL) ? 0 : strlen(currpath->name);
+
+  if (namelen == 0)
+    {
+      if (currpath->blink != NULL)
+        {
+          currpath->ignore = true;
+        }
+        
+      return OK;
+    }
+
+  if (strcmp(currpath->name, "..") == 0)
+    {
+      currpath->ignore = true;
+        
+      node = currpath->blink;
+      while (node)
+        {
+          if (!node->ignore)
+            {
+              namelen = (node->name == NULL) ? 0 : strlen(node->name);
+
+              if (namelen > 0)
+                {
+                  node->ignore = true;
+                }
+              break;
+            }
+          node = node->blink;
+        }
+
+      return OK;
+    }
+
+  if (strcmp(currpath->name, ".") == 0)
+    {
+      currpath->ignore = true;
+      return OK;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: 
+ ****************************************************************************/
+
+static void ftpd_nodefree(FAR struct ftpd_pathnode_s *node)
+{
+  FAR struct ftpd_pathnode_s *prev;
+
+  while (node)
+    {
+      prev = node;
+      node = node->flink;
+
+      if (prev->name != NULL)
+        {
+          free(prev->name);
+        }
+      free(prev);
+    }
+}
+
+/****************************************************************************
+ * Name: ftpd_path2node
+ ****************************************************************************/
+
+static FAR struct ftpd_pathnode_s *ftpd_path2node(FAR const char *path)
+{
+struct ftpd_pathnode_s *ftpd_path2node(const char *path)
+{
+  FAR struct ftpd_pathnode_s *head  = NULL;
+  FAR struct ftpd_pathnode_s *tail = NULL;
+  FAR struct ftpd_pathnode_s *newnode;
+  FAR char *name;
+  int ret;
+
+  if (!path)
+    {
+      return NULL;
+    }
+     
+  while (path[0] != '\0')
+    {
+      name = ftpd_strtok_alloc(false, "/\\", &path);
+      if (!name)
+        {
+          break;
+        }
+
+      if (path[0] != '\0')
+        {
+          path++;
+        }
+
+      newnode = (FAR struct ftpd_pathnode_s *)malloc(sizeof(struct ftpd_pathnode_s));
+      if (!newnode)
+        {
+          free(name);
+          ftpd_nodefree(head);
+          return NULL;
+        }
+
+      newnode->blink  = tail;
+      newnode->flink  = NULL;
+      newnode->ignore = false;
+      newnode->name   = name;
+
+      if (!tail)
+        {
+          head = newnode;
+        }
+      else
+        {
+          tail->flink = newnode;
+        }
+
+      tail = newnode;
+
+      (void)ftpd_pathignore(newnode);
+    }
+     
+  return head;
+}
+
+/****************************************************************************
+ * Name: ftpd_node2path
+ ****************************************************************************/
+
+static FAR char *ftpd_node2path(FAR struct ftpd_pathnode_s *node,
+                                   bool strip)
+{
+  FAR struct ftpd_pathnode_s *node1;
+  FAR struct ftpd_pathnode_s *node2;
+  FAR char *path;
+  FAR size_t allocsize;
+  FAR size_t namelen;
+  int ret;
+
+  if (!node)
+    {
+      return NULL;
+    }
+
+  allocsize = 0;
+  node1 = node;
+  while (node1 != NULL)
+    {
+      if (strip)
+        {
+          if (node1->ignore)
+            {
+              node1 = node1->flink;
+              continue;
+            }
+        }
+
+      node2 = node1->flink;
+      while (strip && node2 != NULL)
+        {
+          if (!node2->ignore)
+            {
+                break;
+            }
+
+          node2 = node2->flink;
+        }
+        
+      namelen = (node1->name == NULL) ? 0 : strlen(node1->name);
+      if (node2 == NULL)
+        {
+          if (namelen <= 0)
+            {
+              allocsize += 2;
+            }
+          else
+            {
+              allocsize += namelen +1;
+            }
+        }
+      else
+        {
+          allocsize += namelen + 1;
+        }
+
+      node1 = node1->flink;
+    }
+   
+  path = (FAR char *)malloc(allocsize);
+  if (!path)
+    {
+      return NULL;
+    }
+
+  allocsize = 0;
+  node1 = node;
+  while (node1 != NULL)
+    {
+      if (strip != 0)
+        {
+          if (node1->ignore)
+            {
+              node1 = node1->flink;
+              continue;
+            }
+        }
+
+      node2 = node1->flink;
+      while (strip && node2 != NULL)
+        {
+          if (!node2->ignore)
+            {
+              break;
+            }
+
+          node2 = node2->flink;
+        }
+        
+      namelen = (node1->name == NULL) ? 0 : strlen(node1->name);
+
+      if (node2 == NULL)
+        {
+          if (namelen <= 0)
+            {
+              allocsize += sprintf(&path[allocsize], "/");
+            }
+          else
+            {
+              allocsize += sprintf(&path[allocsize], "%s", node1->name);
+            }
+        }
+      else
+        {
+          allocsize += sprintf(&path[allocsize], "%s%s", node1->name, "/");
+        }
+
+      node1 = node1->flink;
+    }
+
+  return path;
+}
+
+/****************************************************************************
+ * Name: ftpd_nodeappend
+ ****************************************************************************/
+
+static FAR struct ftpd_pathnode_s *
+ftpd_nodeappend(FAR struct ftpd_pathnode_s *head,
+                FAR struct ftpd_pathnode_s *node, bool override)
+{
+  FAR struct ftpd_pathnode_s *temp;
+
+  if (override)
+    {
+      if (node && node->name && strlen(node->name) <= 0)
+        {
+          ftpd_nodefree(head);
+          head = NULL;                    
+        }
+    }
+
+  if (!head)
+    {
+      if (node)
+        {
+          node->blink = NULL;
+        }
+
+      head = node;
+      node = NULL;
+    }
+        
+  if (node)
+    {
+      temp = head;
+      while (temp->flink)
+        {
+          temp = temp->flink;
+        }
+
+      node->blink = temp;
+      temp->flink = node;
+    }
+        
+  /* clear ignore */
+
+  temp = head;
+  while (temp)
+    {
+      temp->ignore = false;
+      temp = temp->flink;
+    }
+
+  /* restrip */
+
+  temp = head;
+  while (temp)
+    {
+      (void)ftpd_pathignore(temp);
+      temp = temp->flink;
+    }
+
+  return head;
+}
+
+/****************************************************************************
+ * Name: 
+ ****************************************************************************/
+
+static int ftpd_getpath(FAR struct ftpd_session_s *session, FAR const char *chdirectory, FAR char **abspath, FAR char **workpath)
+{
+  FAR struct ftpd_pathnode_s *abspath_node;
+  FAR struct ftpd_pathnode_s *worknode;
+  FAR struct ftpd_pathnode_s *appendnode;
+  FAR char *abspath_local;
+  FAR char *workpath_local;
+  int ret;
+
+  if (abspath)
+    {
+      *abspath = NULL;
+    }
+
+  if (workpath)
+    {
+      *workpath = NULL;
+    }
+    
+  worknode = ftpd_path2node((session->work == NULL) ? "" : session->work);
+  if (!worknode)
+    {
+      return -ENOMEM;
+    }
+
+  appendnode     = ftpd_path2node(chdirectory);
+  worknode       = ftpd_nodeappend(worknode, appendnode, true);
+  workpath_local = ftpd_node2path(worknode, 1);
+
+  if (!workpath_local)
+    {
+      ftpd_nodefree(worknode);
+      return -ENOMEM;
+    }
+
+  abspath_node = ftpd_path2node((session->home == NULL) ? "" : session->home);
+  if (!abspath_node)
+    {
+      free(workpath_local);
+      ftpd_nodefree(worknode);
+      return -ENOMEM;
+    }
+
+  appendnode    = ftpd_path2node(workpath_local);
+  abspath_node  = ftpd_nodeappend(abspath_node, appendnode, false);
+  abspath_local = ftpd_node2path(abspath_node, 1);
+
+  if (!abspath_local)
+    {
+      free(workpath_local);
+      ftpd_nodefree(abspath_node);
+      ftpd_nodefree(worknode);
+      return -ENOMEM;
+    }
+
+  if (!workpath)
+    {
+      free(workpath_local);
+    }
+  else
+    {
+      *workpath = workpath_local;
+    }
+
+  if (!abspath)
+    {
+      free(abspath_local);
+    }
+  else
+    {
+      *abspath = abspath_local;
+    }
+
+  ftpd_nodefree(abspath_node);
+  ftpd_nodefree(worknode);
+  return OK;
+}
+}
+
+/****************************************************************************
+ * Command Helpers
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_changedir
+ ****************************************************************************/
+
+static int ftpd_changedir(FAR struct ftpd_session_s *session,
+                          FAR char *rempath)
+{
+  FAR char *abspath;
+  FAR char *workpath;
+  struct stat st;
+  int ret;
+
+  ret = ftpd_getpath(session, rempath, (char **)(&abspath), (char **)(&workpath));
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not change directory !");
+    }
+
+  ret = stat(abspath, &st);
+  if (ret < 0)
+    {
+      free(workpath);
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           "%03u%c%s%s\r\n", 550, ' ', rempath,
+                           ": No such file or directory");
+    }
+
+  if (S_ISDIR(st.st_mode) == 0)
+    {
+      free(workpath);
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           "%03u%c%s%s\r\n", 550, ' ', rempath,
+                           ": No such file or directory");
+    }
+
+  free(abspath);
+  if (session->work)
+    {
+      free(session->work);
+    }
+  session->work = workpath;
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 250, ' ', "CWD command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_offsatoi
+ ****************************************************************************/
+
+static off_t ftpd_offsatoi(FAR const char *filename, off_t offset)
+{
+  off_t ret;
+  off_t temp;
+  FILE *outstream;
+  int ch;
+
+  outstream = fopen(filename, "r");
+  if (!outstream == NULL)
+    {
+      int errval = errno;
+      ndbg("Failed to open %s: %d\n", filename, errval);
+      return -errval;
+    }
+
+  ret  = 0; 
+  temp = 0; 
+
+  if (offset == (off_t)(-1))
+    {
+     for (;;)
+        {
+          ch = getc(outstream);
+          if (ch == EOF)
+            {
+              break;
+            }
+          ret++;
+          if (ch == '\n')
+            {
+              ret++;
+            }
+        }
+        /* ret is ascii mode size */
+    }
+  else
+    {
+      while (offset < temp)
+        {
+          ch = getc(outstream);
+          if (ch == EOF)
+            {
+              ret = -errno;
+              break;
+            }
+
+          ret++;
+          temp++;
+
+          if (ch == '\n')
+            {
+              temp++;
+            }
+        }
+
+      /* ret is binary mode offset */
+    }
+
+  (void)fclose(outstream);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_stream
+ ****************************************************************************/
+
+static int ftpd_stream(FAR struct ftpd_session_s *session, int cmdtype)
+{
+  FAR char *abspath;
+  FAR char *path;
+  bool isnew;
+  int oflags;
+  uint8_t *buffer;
+  size_t buflen;
+  size_t wantsize;
+  ssize_t rdbytes;
+  ssize_t wrbytes;
+  off_t pos = 0;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret < 0)
+    {
+      ftpd_response(session->cmd.sd, session->txtimeout,
+                    g_respfmt, 550, ' ', "Stream error !");
+      goto errout;
+    }
+  path = abspath;
+
+  ret = ftpd_dataopen(session);
+  if (ret < 0)
+    {
+      goto errout_with_path;
+    }
+
+  switch (cmdtype)
+    {
+      case 0: /* retr */
+        oflags = O_RDONLY;
+        break;
+
+      case 1: /* stor */
+        oflags = O_CREAT | O_WRONLY;
+         break;
+
+      case 2: /* appe */
+        oflags = O_CREAT | O_WRONLY | O_APPEND;
+        break;
+
+      default:
+        oflags = O_RDONLY;
+        break;
+    }
+
+#if defined(O_LARGEFILE)
+  oflags |= O_LARGEFILE;
+#endif
+#if defined(O_BINARY)
+  oflags |= O_BINARY;
+#endif
+  if ((oflags & O_CREAT) != 0)
+    {
+      int mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH;
+
+      if (session->restartpos <= 0)
+        {
+          oflags |= O_TRUNC;
+        }
+
+      isnew = true;
+      session->fd = open(path, oflags | O_EXCL, mode);
+      if (session->fd < 0)
+        {
+          isnew = false;
+          session->fd = open(path, oflags, mode);
+        }
+    }
+  else
+    {
+      isnew = false;
+      session->fd = open(path, oflags);
+    }
+
+  if (session->fd < 0)
+    {
+      ret = -errno;
+      (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 550, ' ', "Can not open file !");
+      goto errout_with_data;
+    }
+    
+  /* Restart position */
+
+  if (session->restartpos > 0)
+    {
+      off_t seekoffs;
+      off_t seekpos;
+
+      /* Get the seek position */
+
+      if (session->type == FTPD_SESSIONTYPE_A)
+        {
+          seekpos = ftpd_offsatoi(path, session->restartpos);
+          if (seekpos < 0)
+            {
+              ndbg("ftpd_offsatoi failed: %d\n", seekpos);
+              seekoffs = (off_t)-1;
+              ret = seekpos;
+            }
+        }
+      else
+        {
+          seekpos = session->restartpos;
+          if (seekpos < 0)
+            {
+              ndbg("Bad restartpos: %d\n", seekpos);
+              seekoffs = (off_t)-1;
+              ret = -EINVAL;
+            }
+        }
+
+      /* Seek to the request position */
+
+      if (seekpos >= 0)
+        {
+          seekoffs = lseek(session->fd, seekpos, SEEK_SET);
+          if (seekoffs < 0)
+            {
+              int errval = errno;
+              ndbg("lseek failed: %d\n", errval);
+              ret = -errno;
+            }
+        }
+
+      /* Report errors */
+
+      if (seekoffs < 0)
+        {
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 550, ' ', "Can not seek file !");
+          goto errout_with_session;
+        }
+
+        pos += (off_t)seekoffs;
+    }
+
+  /* Send success message */
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 150, ' ', "Opening data connection");
+  if (ret < 0)
+    {
+      ndbg("ftpd_response failed: %d\n", ret);
+      goto errout_with_session;
+    }
+
+ for (;;)
+    {
+      if (session->type == FTPD_SESSIONTYPE_A)
+        {
+          buffer   = &session->data.buffer[session->data.buflen >> 2];
+          wantsize = session->data.buflen >> 2;
+        }
+      else
+        {
+          buffer   = session->data.buffer;
+          wantsize = session->data.buflen;
+        }
+
+      if (cmdtype == 0)
+        {
+          rdbytes = (ssize_t)read(session->fd, session->data.buffer,
+                                 wantsize);
+        }
+      else
+        {
+          rdbytes = ftpd_recv(session->data.sd, session->data.buffer,
+                              wantsize, session->rxtimeout);
+        }
+
+      if (rdbytes < 0)
+        {
+          ndbg("ftp_recv failed: %d\n", rdbytes);
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 550, ' ', "Data read error !");
+          ret = redbytes;
+          break;
+        }
+
+      if (rdbytes == 0)
+        {
+          /* EOF */
+
+          ret = -ECONNRESET;
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 226, ' ', "Transfer complete");
+          break;
+        }
+
+      if (session->type == FTPD_SESSIONTYPE_A)
+        {
+          /* Change to ascii */
+
+          size_t offset = 0;
+          buflen = 0;
+          while (offset < ((size_t)rdbytes))
+            {
+              if (session->data.buffer[offset] == '\n')
+                {
+                  buffer[buflen++] = '\r';
+                }
+              buffer[buflen++] = session->data.buffer[offset++];
+            }
+        }
+      else
+        {
+          buffer = session->data.buffer;
+          buflen = (size_t)rdbytes;
+        }
+
+      if (cmdtype == 0)
+        {
+          wrbytes = ftpd_send(session->data.sd, buffer, buflen, session->txtimeout);
+          if (wrbytes < 0)
+            {
+              ndbg("ftpd_send failed: %d\n", wrbytes);
+              ret = wrbytes;
+            }
+        }
+      else
+        {
+          wrbytes = (ssize_t)write(session->fd, (const void *)buffer, buflen);
+          if (wrbytes < 0)
+            {
+              int errval = errno;
+              ndbg("ftpd_send failed: %d\n", errval);
+              ret = -errval;
+            }
+        }
+
+      if (wrbytes != ((ssize_t)buflen))
+        {
+          (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 550, ' ', "Data send error !");
+           break;
+        }
+
+        pos += (off_t)wrbytes;
+    }
+    
+errout_with_session:;
+    close(session->fd);
+    session->fd = -1;
+
+    if (isnew && ret < 0)
+      {
+        (void)remove(path);
+      }
+
+errout_with_data:;
+    (void)ftpd_dataclose(session);
+
+errout_with_path:
+    free(abspath);
+
+errout:
+    return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_listoption
+ ****************************************************************************/
+
+static uint8_t ftpd_listoption(FAR char **param)
+{
+  FAR char *ptr = *param;
+  uint8_t ret = 0;
+
+  while (*ptr == '-')
+    {
+      while (*ptr != '\0' && !isspace(*ptr))
+        {
+          switch (*ptr)
+            {
+              case 'a':
+              case 'A':
+                ret |= FTPD_LISTOPTION_A;
+                break;
+
+              case 'l':
+              case 'L':
+                ret |= FTPD_LISTOPTION_L;
+                break;
+
+              case 'f':
+              case 'F':
+                ret |= FTPD_LISTOPTION_F;
+                break;
+
+              case 'r':
+              case 'R':
+                ret |= FTPD_LISTOPTION_R;
+                break;
+
+              default:
+                ret |= FTPD_LISTOPTION_UNKNOWN;
+                break;
+            }
+
+          ptr++;
+        }
+
+      if (*ptr != '\0')
+        {
+          while (*ptr != '\0' && isspace(*ptr))
+            {
+              ptr++;
+            }
+        }
+    }
+
+  *param = ptr;
+  return ret;
+}
+
+/****************************************************************************
+ * Name: fptd_listscan
+ ****************************************************************************/
+
+static int ftpd_listbuffer(FAR struct ftpd_session_s *session, FAR char *path,
+                           FAR struct stat *st, FAR char *buffer, size_t buflen,
+                           unsigned int opton)
+{
+  FAR char *name;
+  size_t offset = 0;
+
+  name = basename(path);
+
+  if ((opton & FTPD_LISTOPTION_L) != 0)
+    {
+      FAR const char *str;
+      struct tm tm;
+      time_t now;
+
+      if (S_ISREG(st->st_mode) != 0)
+        {
+          str = "-";
+        }
+      else if (S_ISDIR(st->st_mode) != 0)
+        {
+          str = "d";
+        }
+      else if (S_ISCHR(st->st_mode) != 0)
+        {
+          str = "c";
+        }
+      else if (S_ISBLK(st->st_mode) != 0)
+        {
+          str = "b";
+        }
+      else if (S_ISFIFO(st->st_mode) != 0)
+        {
+          str = "p";
+        }
+      else if (S_ISLNK(st->st_mode) != 0)
+        {
+          str = "l";
+        }
+      else if (S_ISSOCK(st->st_mode) != 0)
+        {
+          str = "s";
+        }
+      else
+        {
+          str = "-";
+        }
+
+      offset += snprint(&buffer[offset], buflen - offset, "%s", str);
+
+      /* User */
+
+      str = ((st->st_mode & S_IRUSR) != 0) ? "r" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      str = ((st->st_mode & S_IWUSR) != 0) ? "w" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      if ((st->st_mode & S_ISUID) != 0 && (st->st_mode & S_IXUSR) != 0)
+        {
+          str = "s";
+        }
+      else if ((st->st_mode & S_ISUID) != 0)
+        {
+          str = "S";
+        }
+      else if ((st->st_mode & S_IXUSR) != 0)
+        {
+          str = "x";
+        }
+      else
+        {
+          str = "-";
+        }
+
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      /* group */
+
+      str = ((st->st_mode & S_IRGRP) != 0) ? "r" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      str = ((st->st_mode & S_IWGRP) != 0) ? "w" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      if ((st->st_mode & S_ISGID) != 0 && (st->st_mode & S_IXGRP) != 0)
+        {
+          str = "s";
+        }
+      else if ((st->st_mode & S_ISGID) != 0)
+        {
+          str = "S";
+        }
+      else if ((st->st_mode & S_IXGRP) != 0)
+        {
+          str = "x";
+        }
+      else
+        {
+          str = "-";
+        }
+
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      /* other */
+
+      str = ((st->st_mode & S_IROTH) != 0) ? "r" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      str = ((st->st_mode & S_IWOTH) != 0) ? "w" : "-";
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      if ((st->st_mode & S_ISVTX) != 0 && (st->st_mode & S_IXOTH) != 0)
+        {
+          str = "t";
+        }
+      else if ((st->st_mode & S_ISVTX) != 0)
+        {
+          str = "T";
+        }
+      else if ((st->st_mode & S_IXOTH) != 0)
+        {
+          str = "x";
+        }
+      else
+        {
+          str = "-";
+        }
+
+      offset += snprintf(&buffer[offset], buflen - offset, "%s", str);
+
+      /* nlink */
+
+      offset += snprintf(&buffer[offset], buflen - offset, "%4u", st->st_nlink);
+
+      /* username */
+
+      offset += snprintf(&buffer[offset], buflen - offset, " %8u", st->st_uid);
+
+      /* groupname */
+
+      offset += snprintf(&buffer[offset], buflen - offset, " %8u", st->st_gid);
+
+      /* size */
+
+      offset += snprintf(&buffer[offset], buflen - offset, " %8u", st->st_size);
+
+      /* time */
+
+      memcpy(&tm, localtime((GST const time_t *)&st->st_mtime), sizeof(tm));
+      offset += snprintf(&buffer[offset], buflen - offset, " %s %2u",
+                         g_monthtab[tm.tm_mon], tm.tm_mday);
+      now = time(0);
+      if ((now - st->st_mtime) > ((time_t)(60 * 60 * 24 * 180)))
+        {
+          offset += snprintf(&buffer[offset], buflen - offset, " %5u",
+                             tm.tm_year + 1900);
+        }
+      else
+        {
+          offset += snprintf(&buffer[offset], buflen - offset, " %02u:%02u",
+                             tm.tm_hour, tm.tm_min);
+        }
+        
+      /* basename */
+
+      offset += snprintf(&buffer[offset], buflen - offset, " %s", name);
+
+      /* linkname */
+
+      if (S_ISLNK(st->st_mode) != 0)
+        {
+          FAR char *temp;
+          int namelen;
+
+          temp = (FAR char *)malloc(PATH_MAX + 1);
+          if (temp != NULL)
+            {
+              namelen = readlink(path, temp, PATH_MAX);
+              if (namelen != (-1))\
+                {
+                  temp[namelen] = '\0';
+                }
+
+              offset += snprintf(&buffer[offset], buflen - offset, " -> %s", temp);
+              free(temp);
+            }
+        }
+        
+      /* end */
+
+      offset += snprintf(&buffer[offset], buflen - offset, "\r\n");
+    }
+  else
+    {
+      /* basename */
+
+      offset += snprintf(&buffer[offset], buflen - offset, "%s\r\n", name);
+    }
+
+  return 0;
+}
+
+/****************************************************************************
+ * Name: fptd_listscan
+ ****************************************************************************/
+
+static int fptd_listscan(FAR struct ftpd_session_s *session, FAR char *path,
+                         unsigned int opton)
+{
+  FAR char *temp;
+  DIR *dir;
+  struct dirent *entry;
+  struct stat st;
+  int ret;
+
+  ret = stat(path, &st);
+  if (ret < 0)
+    {
+      return -errno;
+    }
+
+  if (!S_ISDIR(st.st_mode))
+    {
+      ret = ftpd_listbuffer(session, path, (&st, session->data.buffer,
+                            session->data.buflen, opton); 
+      if (ret == 0)
+        {
+          ret = ftpd_response(session->data.sd, session->txtimeout,
+                              "%s", (char *)session->data.buffer);
+        }
+
+      return ret;
+    }
+
+  dir = opendir(path);
+  if (!dir)
+    {
+      int errval = errno;
+      ndbg("dir() failed\n", errval);
+      return -errval;
+    }
+
+  for (;;)
+    {
+      entry = readdir(dir);
+      if (!entry)
+        {
+          break;
+        }
+
+      if (entry->d_name[0] == '.')
+        {
+          if ((opton & FTPD_LISTOPTION_A) == 0)
+            {
+              continue;
+            }
+        }
+ 
+      asprintf(temp, "%s/%s", path, entry->d_name);
+      if (!temp)
+        {
+          continue;
+        }
+
+      ret = stat(temp, &st);
+      if (ret < 0)
+        {
+          free(temp);
+          continue;
+        }
+
+      ret = ftpd_listbuffer(session, temp, &st, session->data.buffer,
+                            session->data.buflen, opton); 
+      if (ret >= 0)
+        {
+          ret = ftpd_response(session->data.sd, session->txtimeout,
+                              "%s", session->data.buffer);
+        }
+
+      free(temp);
+      if (ret < 0)
+        {
+          break;
+        }
+    }
+
+  (void)closedir(dir);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_list
+ ****************************************************************************/
+
+static int ftpd_list(FAR struct ftpd_session_s *session, unsigned int opton)
+{
+  FAR char *abspath;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret >= 0)
+    {
+      ret = fptd_listscan(session, abspath, opton);
+      free(abspath);
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Command Handlers
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_command_user
+ ****************************************************************************/
+
+static int ftpd_command_user(FAR struct ftpd_session_s *session)
+{
+  int ret;
+
+  if (session->user)
+    {
+      free(session->user);
+      session->user = NULL;
+    }
+
+  /* No account info */
+
+  if (!session->head)
+    {
+      FAR char *home;
+
+      home = getenv("HOME");
+      session->curr = NULL;
+      session->home = strdup((home == NULL) ? "/" : home);
+      session->work = strdup("/");
+
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 230, ' ', "Login successful.");
+      if (ret < 0)
+        {
+          session->curr = NULL;
+        }
+      return ret;
+    }
+
+  /* For no password user */
+
+  session->curr = ftpd_account_login(session, session->param, NULL);
+  if (session->curr)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 230, ' ', "Login successful.");
+      if (ret < 0)
+        {
+          session->curr = NULL;
+        }
+      return ret;
+    }
+
+  /* Set up the user */
+
+  session->user = strdup(session->param);
+  if (!session->user)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 451, ' ', "Memory exhausted !");
+    }
+  session->flags |= FTPD_SESSIONFLAG_USER;
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "%03u%c%s%s\r\n", 331, ' ', "Password required for ",
+                       session->user);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_pass
+ ****************************************************************************/
+
+static int ftpd_command_pass(FAR struct ftpd_session_s *session)
+{
+  int ret;
+
+  if (!session->user)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 530, ' ', "Please login with USER !");
+    }
+
+  session->curr = ftpd_account_login(session, session->user, session->param);
+  if (!session->curr != NULL
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 230, ' ', "Login successful.");
+      if (ret < 0)
+        {
+          session->curr = NULL;
+        }
+      return ret;
+    }
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 530, ' ', "Login incorrect !");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_syst
+ ****************************************************************************/
+
+static int ftpd_command_syst(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 215, ' ', "UNIX Type: L8");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_type
+ ****************************************************************************/
+
+static int ftpd_command_type(FAR struct ftpd_session_s *session)
+{
+  size_t parmlen = strlen(session->param);
+
+  if (parmlen == 1)
+    {
+      switch (toupper(session->param[0]))
+        {
+        case 'A':
+          {
+            session->type = FTPD_SESSIONTYPE_A;
+            return ftpd_response(session->cmd.sd, session->txtimeout,
+                                 g_respfmt, 200, ' ', "Type set to A");
+          }
+
+        case 'I':
+          {
+            session->type = FTPD_SESSIONTYPE_I;
+            return ftpd_response(session->cmd.sd, session->txtimeout,
+                                 g_respfmt, 200, ' ', "Type set to I");
+          }
+
+        case 'L':
+          {
+            session->type = FTPD_SESSIONTYPE_L8;
+            return ftpd_response(session->cmd.sd, session->txtimeout,
+                                 g_respfmt, 200, ' ',
+                                 "Type set to L (byte size 8)");
+          }
+
+        default:
+          {
+            session->type = FTPD_SESSIONTYPE_NONE;
+            return ftpd_response(session->cmd.sd, session->txtimeout,
+                                 g_respfmt, 501, ' ', "Type unknown !");
+          }
+        }
+    }
+  else if (parmlen == 3)
+    {
+      if (toupper(session->param[0]) == 'L' && session->param[1] == ' ')
+        {
+          if (session->param[2] == '8')
+            {
+              session->type = FTPD_SESSIONTYPE_L8;
+              return ftpd_response(session->cmd.sd, session->txtimeout,
+                                   g_respfmt, 200, ' ', "Type set to L 8");
+            }
+          else
+            {
+              session->type = FTPD_SESSIONTYPE_NONE;
+              return ftpd_response(session->cmd.sd, session->txtimeout,
+                                   g_respfmt, 504, ' ', "Byte size must be 8 !");
+            }
+        }
+    }
+    
+  session->type = FTPD_SESSIONTYPE_NONE;
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 500, ' ', "TYPE not understood !");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_mode
+ ****************************************************************************/
+
+static int ftpd_command_mode(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 502, ' ',
+                       "MODE command not implemented !");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_abor
+ ****************************************************************************/
+
+static int ftpd_command_abor(FAR struct ftpd_session_s *session)
+{
+  (void)ftpd_dataclose(session);
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 426, ' ',
+                       "Transfer aborted. Data connection closed.");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_quit
+ ****************************************************************************/
+
+static int ftpd_command_quit(FAR struct ftpd_session_s *session)
+{
+  int ret;
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 221, ' ', "Good-bye");
+  if (ret >= 0)
+    {
+      ret = 1; /* To disconnect */
+    }
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_command_noop
+ ****************************************************************************/
+
+static int ftpd_command_noop(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 200, ' ',
+                       "NOOP command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_port
+ ****************************************************************************/
+
+static int ftpd_command_port(FAR struct ftpd_session_s *session)
+{
+  uint8_t value[6];
+  unsigned int utemp;
+  int temp;
+  FAR char *str;
+  int index;
+  int ret;
+
+  index = 0;
+  while (index < 6)
+    {
+      /* Get the next value from the comma-delimited string */
+
+      str = ftpd_strtok(true, ",", &session->param);
+      if (*str == '\0')
+        {
+          break;
+        }
+
+      /* ftpd_strtok differs from the real strtok in that it does not NUL-
+       * terminate the strings.
+       */
+
+      if (session->param[0] != '\0')
+        {
+          session->param[0] = '\0';
+          session->param++;
+        }
+
+      /* Get the next value from the list */
+
+      temp = atoi(str);
+      if (temp < 0 || temp > 255)
+        {
+          ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 501, ' ',
+                              "Illegal PORT command");
+          if (ret < 0)
+            {
+              ndbg("ftpd_response failed: %d\n", ret);
+              return ret;
+            }
+        }
+
+      value[index++] = (uint8_t)temp;
+    }
+
+  if (index < 6)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 501, ' ', "Illegal PORT command");
+    }
+
+  (void)ftpd_dataclose(session);
+
+#if 1 /* Follow param */
+
+  memset(session->data.addr, 0, sizeof(session->data.addr));
+
+  session->data.addr.in4.sin_family = AF_INET;
+
+  utemp = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | (value[3]);
+  session->data.addr.in4.sin_addr.s_addr = htonl((long)utemp);
+    
+  utemp = (value[4] << 8) | (value[5]);
+  session->data.addr.in4.sin_port = htons((short)utemp);
+
+#else /* Follow command socket address */
+
+  session->data.addrlen = sizeof(session->data.addr);
+  ret = getpeername(session->cmd.sd, (struct sockaddr *)&session->data.addr,
+                   &session->data.addrlen);
+  if (ret >= 0)
+    {
+      if (session->data.addr.ss.ss_family != AF_INET)
+        {
+          memset(&session->data.addr, 0, sizeof(session->data.addr));
+
+          session->data.addr.in4.sin_family = AF_INET;
+    
+          utemp = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | (value[3]);
+          session->data.addr.in4.sin_addr.s_addr = htonl(utemp);
+        }
+            
+      utemp = (value[4] << 8) | (value[5]);
+      session->data.addr.in4.sin_port = htons(utemp);
+    }
+  else
+    {
+      memset(&session->data.addr, 0, sizeof(session->data.addr));
+
+      session->data.addr.in4.sin_family = AF_INET;
+    
+      utemp = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | (value[3]);
+      session->data.addr.in4.sin_addr.s_addr = htonl(utemp);
+    }
+
+  utemp = (value[4] << 8) | (value[5]);
+  session->data.addr.in4.sin_port = htons(utemp);
+#endif
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 200, ' ',
+                       "PORT command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_eprt
+ ****************************************************************************/
+
+static int ftpd_command_eprt(FAR struct ftpd_session_s *session)
+{
+  FAR const char *str;
+  FAR char *field[3];
+  sa_family_t family;
+  size_t left;
+  size_t right;
+  int count;
+  int index;
+
+  left = 0;
+  right = strlen(session->param);
+
+  if (right <= 0)
+    {
+      /* no message ? */
+
+      (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 502, ' ',
+                          "EPRT command not implemented !");
+      return -EINVAL;
+    }
+  right--;
+
+  while (session->param[left] != '\0')
+    {
+      if (session->param[left] == '|')
+        {
+          left++;
+          break;
+        }
+      left++;
+    }
+
+  if (right <= 0 || left > right)
+    {
+      /* Invalid format */
+
+      (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 502, ' ',
+                          "EPRT command not implemented !");
+      return -EINVAL;
+    }
+            
+  count = 3;
+  for (index = 0; index < count; index++)
+    {
+      field[index] = NULL;
+    }
+    
+  str = (FAR const char *)&session->param[left];
+  for (index = 0; index < count && *str != '\0'; index++)
+    {
+      field[index] = ftpd_strtok_alloc(true, ",|)", &str);
+       if (!field[index])
+         {
+            break;
+         }
+
+       if (*str != '\0')
+         {
+            str++;
+         }
+    }
+
+  if (index < count)
+    {
+      for (index = 0; index < count; index++)
+        {
+          if (field[index])
+            {
+              free(field[index]);
+            }
+        }
+
+      (void)ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 502, ' ',
+                          "EPRT command not implemented !");
+        return -EINVAL;
+    }
+
+  (void)ftpd_dataclose(session);
+
+  memset(&session->data.addr, 0, sizeof(session->data.addr));
+  family = atoi(field[0]);
+#ifndef CONFIG_NET_IPv6
+  if (family == 1)
+    {
+      family = AF_INET;
+        
+      session->data.addr.in4.sin_family = family;
+      (void)inet_pton(family, field[1], &session->data.addr.in4.sin_addr);
+      session->data.addr.in4.sin_port = htons((short)atoi(field[2]));
+    }
+  else
+#endif
+#ifdef CONFIG_NET_IPv6
+  if (family == 2)
+    {
+      family = AF_INET6;
+        
+      session->data.addr.in6.sin6_family = family;
+      (void)inet_pton(family, field[1], &session->data.addr.in6.sin6_addr);
+      session->data.addr.in6.sin6_port = htons((short)atoi(field[2]));
+    }
+  else
+#endif
+    {
+      ndbg("Unrecognized family: %d\n", family);
+      family = AF_UNSPEC;
+    }
+    
+  for (index = 0;index < count;index++)
+    {
+      if (field[index])
+        {
+          free(field[index]);
+        }
+    }
+
+  if (family == AF_UNSPEC)
+    {
+      ftpd_response(session->cmd.sd, session->txtimeout,
+                    g_respfmt, 502, ' ',
+                    "EPRT command not implemented !");
+      return -EINVAL;
+    }
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 200, ' ', "EPRT command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_pwd
+ ****************************************************************************/
+
+static int ftpd_command_pwd(FAR struct ftpd_session_s *session)
+{
+  FAR const char *workpath;
+
+  if (!session->work)
+    {
+      workpath = "";
+    }
+  else
+    {
+      workpath = session->work;
+    }
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "%03u%c\"%s\" is current directory.\r\n",
+                       257, ' ', workpath);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_cwd
+ ****************************************************************************/
+
+static int ftpd_command_cwd(FAR struct ftpd_session_s *session)
+{
+  return ftpd_changedir(session, session->param);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_cdup
+ ****************************************************************************/
+
+static int ftpd_command_cdup(FAR struct ftpd_session_s *session)
+{
+  return ftpd_changedir(session, g_cdup);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_rmd
+ ****************************************************************************/
+
+static int ftpd_command_rmd(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  FAR char *workpath;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, &workpath);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not remove directory !");
+    }
+
+  if (strcmp(session->home, abspath) == 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not remove home directory !");
+    }
+
+  if (strcmp(session->work, workpath) == 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not remove current directory !");
+    }
+
+  ret = rmdir(abspath)
+  if (ret < 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not remove directory !");
+    }
+    
+  free(abspath);
+  free(workpath);
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 250, ' ',
+                       "RMD command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_mkd
+ ****************************************************************************/
+
+static int ftpd_command_mkd(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not make directory !");
+    }
+
+  ret = mkdir(abspath, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
+  if (ret < 0)
+    {
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "Can not make directory !");
+    }
+    
+  free(abspath);
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "g_respfmt, 250, ' ', "MKD command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_dele
+ ****************************************************************************/
+
+static int ftpd_command_dele(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  FAR char *workpath;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, &workpath);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "Can not delete file !");
+    }
+
+  if (strcmp(session->home, abspath) == 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not delete home directory !");
+    }
+
+  if (strcmp(session->work, workpath) == 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ',
+                           "Can not delete current directory !");
+    }
+
+  ret = remove(abspath);
+  if (ret < 0)
+    {
+      free(abspath);
+      free(workpath);
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "Can not delete file !");
+    }
+    
+  free(abspath);
+  free(workpath);
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 250, ' ', "DELE command successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_pasv
+ ****************************************************************************/
+
+static int ftpd_command_pasv(FAR struct ftpd_session_s *session)
+{
+  unsigned int value[6];
+  unsigned int temp;
+
+  (void)ftpd_dataclose(session);
+
+  session->data.addrlen = sizeof(session->data.addr);
+
+  session->data.sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+  if (session->data.sd < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ', "PASV socket create fail !");
+    }
+
+  ret = getsockname(session->cmd.sd, (FAR struct sockaddr *)&session->data.addr,
+                    &session->data.addrlen);
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ', "PASV getsockname fail !");
+    }
+
+#ifdef CONFIG_NET_IPv6
+    if (session->data.addr.ss.ss_family == AF_INET6)
+      {
+        /* Convert ipv6 to ipv4 */
+
+        if ((IN6_IS_ADDR_V4MAPPED(&session->data.addr.in6.sin6_addr) != 0) ||
+            (IN6_IS_ADDR_V4COMPAT(&session->data.addr.in6.sin6_addr) != 0))
+          {
+            /* convert ipv6 to ipv4 */
+
+            in_addr in4addr;
+
+            in4addr.s_addr = session->data.addr.in6.sin6_addr.s6_addr32[3];
+
+            memset(&session->data.addr, 0, sizeof(session->data.addr));
+            session->data.addr.in4.sin_family = AF_INET;
+            session->data.addr.in4.sin_addr.s_addr = in4addr.s_addr;
+        }
+    }
+  else
+#endif
+#ifndef CONFIG_NET_IPv6
+  if (session->data.addr.ss.ss_family != AF_INET)
+    {
+      /* Fixed to ipv4 */
+
+      memset((FAR void *)(&session->data.addr), 0, sizeof(session->data.addr));
+      session->data.addr.in4.sin_family = AF_INET;
+      session->data.addr.in4.sin_addr.s_addr = htonl(INADDR_ANY);
+    }
+  else
+#endif
+    {
+      ndbg("Unsupported family\n");
+    }
+
+  session->data.addr.in4.sin_port = 0;
+  ret = bind(session->data.sd, (FAR const struct sockaddr *)&session->data.addr,
+             session->data.addrlen)
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ', "PASV bind fail !");
+    }
+
+  ret = getsockname(session->data.sd, (FAR struct sockaddr *)&session->data.addr,
+                    &session->data.addrlen);
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ', "PASV getsockname fail !");
+    }
+
+  ret = listen(session->data.sd, 1); 
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ', "PASV listen fail !");
+    }
+
+  if (ntohl(session->data.addr.in4.sin_addr.s_addr) == INADDR_ANY)
+    {
+      (void)ftpd_dataclose(session);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 425, ' ',
+                           "Can not open passive connection");
+    }
+
+  temp = ntohl(session->data.addr.in4.sin_addr.s_addr);
+  value[0] = (temp >> 24) & 0xff;
+  value[1] = (temp >> 16) & 0xff;
+  value[2] = (temp >> 8) & 0xff;
+  value[3] = (temp) & 0xff;
+
+  temp = (unsigned int)ntohs(session->data.addr.in4.sin_port);
+  value[4] = (temp >> 8) & 0xff;
+  value[5] = (temp) & 0xff;
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      "%03u%cEntering passive mode (%u,%u,%u,%u,%u,%u).\r\n",
+                      227, ' ',
+                      value[0], value[1], value[2],
+                      value[3], value[4], value[5]);
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_command_epsv
+ ****************************************************************************/
+
+static int ftpd_command_epsv(fAR struct ftpd_session_s *session)
+{
+  (void)ftpd_dataclose(session);
+
+  session->data.addrlen = sizeof(session->data.addr);
+
+#ifdef CONFIG_NET_IPv6
+  session->data.sd = socket(PF_INET6, SOCK_STREAM, ftpd_getprotocol("tcp"));
+  if (session->data.sd < 0)
+    {
+      session->data.sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+    }
+  else
+    {
+#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)    
+      int ipv6only = 0;
+      (void)setsockopt(session->data.sd, IPPROTO_IPV6, IPV6_V6ONLY, &ipv6only, sizeof(ipv6only));
+#endif        
+    }
+#else
+  session->data.sd = socket(PF_INET, SOCK_STREAM, ftpd_getprotocol("tcp"));
+#endif
+
+  if (session->data.sd < 0)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 500, ' ', "EPSV socket create fail !");
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+  ret = getsockname(session->cmd.sd, (FAR struct sockaddr *)&session->data.addr,
+                   &session->data.addrlen);
+  if (ret < 0)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 500, ' ', "EPSV getsockname fail !");
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+#ifdef CONFIG_NET_IPv6
+  if (session->data.addr.ss.ss_family == AF_INET6)
+    {
+      session->data.addr.in6.sin6_port = htons(0);
+    }
+  else if (session->data.addr.ss.ss_family == AF_INET)
+    {
+      session->data.addr.in4.sin_port = htons(0);
+    }
+#else
+  session->data.addr.in4.sin_port = htons(0);
+#endif    
+
+  ret = bind(session->data.sd, (FAR const struct sockaddr *)&session->data.addr,
+             session->data.addrlen);
+  if (ret < 0)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 500, ' ', "EPSV bind fail !");
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+  ret = getsockname(session->data.sd, (FAR struct sockaddr *)&session->data.addr,
+                    &session->data.addrlen);
+  if (ret < 0)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 500, ' ', "EPSV getsockname fail !");
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+  ret = listen(session->data.sd, 1);
+  if (ret < 0)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+            g_respfmt, 500, ' ', "EPSV listen fail !");
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+#ifdef CONFIG_NET_IPv6
+  if (session->data.addr.ss.ss_family == AF_INET6)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          "%03u%cEntering Extended Passive Mode (|||%u|).\r\n",
+                          229, ' ',
+                          ntohs(session->data.addr.in6.sin6_port));
+      if (ret < 0)
+        {
+          (void)ftpd_dataclose(session);
+          return ret;
+        }
+    }
+  else
+#else
+  if (session->data.addr.ss.ss_family == AF_INET)
+    {
+      ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          "%03u%cEntering Extended Passive Mode (|%u||%u|).\r\n",
+                          229, ' ', 1,
+                          ntohs(session->data.addr.in4.sin_port));
+      if (ret < 0)
+        {
+          (void)ftpd_dataclose(session);
+          return ret;
+        }
+    }
+  else
+#endif
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 502, ' ', "EPSV command not implemented !");
+    }
+}
+
+/****************************************************************************
+ * Name: ftpd_command_list
+ ****************************************************************************/
+
+static int ftpd_command_list(FAR struct ftpd_session_s *session)
+{
+  uint8_t opton = FTPD_LISTOPTION_L;
+  int ret;
+
+  ret = ftpd_dataopen(session);
+  if (ret < 0)
+    {
+      return 0;
+    }
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 150, ' ',
+                      "Opening ASCII mode data connection for file list");
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+  opton |= ftpd_listoption((char **)(&session->param));
+  (void)ftpd_list(session, opton);
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 226, ' ', "Transfer complete");
+
+  (void)ftpd_dataclose(session);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_command_nlst
+ ****************************************************************************/
+
+static int ftpd_command_nlst(FAR struct ftpd_session_s *session)
+{
+  uint8_t opton = 0;
+  int ret;
+
+  ret = ftpd_dataopen(session);
+  if (ret < 0)
+    {
+      return 0;
+    }
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 150, ' ',
+                      "Opening ASCII mode data connection for file list");
+  if (ret < 0)
+    {
+      (void)ftpd_dataclose(session);
+      return ret;
+    }
+
+  opton |= ftpd_listoption((char **)(&session->param));
+  (void)ftpd_list(session, opton);
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                      g_respfmt, 226, ' ', "Transfer complete");
+
+  (void)ftpd_dataclose(session);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_command_acct
+ ****************************************************************************/
+
+static int ftpd_command_acct(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 502, ' ', "ACCT command not implemented !");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_size
+ ****************************************************************************/
+
+static int ftpd_command_size(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  FAR char *path;
+  struct stat st;
+  FAR FILE *outstream;
+  off_t offset;
+  int ch;
+  int status
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "Unknown size !");
+    }
+  path = abspath;
+    
+  ret = 0;
+  switch (session->type)
+    {
+    case FTPD_SESSIONTYPE_NONE:
+    case FTPD_SESSIONTYPE_L8:
+    case FTPD_SESSIONTYPE_I:
+      {
+        status = stat(path, &st);
+        if (status < 0)
+          {
+            ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                "%03u%c%s%s\r\n", 550, ' ', session->param,
+                                ": not a regular file.");
+          }
+        else if (!S_ISREG(st.st_mode))
+          {
+             ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                 "%03u%c%s%s\r\n", 550, ' ', session->param,
+                                 ": not a regular file.");
+          }
+        else
+          { 
+            ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                "%03u%c%llu\r\n", 213, ' ', (unsigned long long)st.st_size);
+          }
+      }
+      break;
+
+    case FTPD_SESSIONTYPE_A: 
+      {
+        status = stat(path, &st);
+        if (status < 0)
+          {
+            ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                "%03u%c%s%s\r\n", 550, ' ', session->param,
+                                ": not a regular file.");
+            if (ret < 0)
+              {
+                return ret;
+              }
+          }
+        else if (!S_ISREG(st.st_mode))
+          {
+            ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                "%03u%c%s%s\r\n", 550, ' ', session->param,
+                                ": not a regular file.");
+            if (ret < 0)
+              {
+                return ret;
+              }
+          }
+
+
+        outstream = fopen(path, "r");
+        if (!outstream)
+          {
+            ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                                "%03u%c%s%s\r\n", 550, ' ', session->param,
+                                ": Can not open file !");
+            if (ret < 0)
+              {
+                return ret;
+              }
+           }
+
+        offset = 0;
+        for (;;)
+          {
+            ch = getc(outstream);
+            if (ch == EOF)
+              {
+                break;
+              }
+            else if (ch == 'c')
+              {
+                offset++;
+              }
+            offset++;
+          }
+
+        (void)fclose(outstream);
+        ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                            "%03u%c%llu\r\n", 213, ' ', (unsigned long long)offset);
+      }
+      break;
+
+    default:
+      {
+        ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                            g_respfmt, 504, ' ', "SIZE not implemented for type");
+      }
+      break;
+    }
+
+  free(abspath);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_command_stru
+ ****************************************************************************/
+
+static int ftpd_command_stru(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 502, ' ', "STRU command not implemented !");
+}
+
+/****************************************************************************
+ * Name: 
+ ****************************************************************************/
+
+static int ftpd_command_rnfr(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  FAR char *path;
+  struct stat st;
+  int ret;
+
+  if (session->renamefrom != NULL)
+    {
+      free(session->renamefrom);
+      session->renamefrom = NULL;
+    }
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "RNFR error !");
+    }
+  path = abspath;
+
+  ret = stat(path, &st);
+  if (ret < 0)
+    {
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           "%03u%c%s%s\r\n", 550, ' ', session->param,
+                           ": No such file or directory.");
+    }
+    
+  session->renamefrom = abspath;
+  session->flags |= FTPD_SESSIONFLAG_RENAMEFROM;
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 350, ' ', "RNFR successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_rnto
+ ****************************************************************************/
+
+static int ftpd_command_rnto(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  int ret;
+    
+  if (!session->renamefrom)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "RNTO error !");
+    }
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret < 0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "RNTO error !");
+    }
+ 
+  ret = rename(session->renamefrom, abspath);
+  if (ret < 0)
+    {
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           "%03u%c%s%s\r\n", 550, ' ', session->param,
+                           ": Rename error.");
+    }
+
+  free(abspath);
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 250, ' ', "Rename successful");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_retr
+ ****************************************************************************/
+
+static int ftpd_command_retr(FAR struct ftpd_session_s *session)
+{
+    return ftpd_stream(session, 0);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_stor
+ ****************************************************************************/
+
+static int ftpd_command_stor(FAR struct ftpd_session_s *session)
+{
+    return ftpd_stream(session, 1);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_appe
+ ****************************************************************************/
+
+static int ftpd_command_appe(FAR struct ftpd_session_s *session)
+{
+    return ftpd_stream(session, 2);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_rest
+ ****************************************************************************/
+
+static int ftpd_command_rest(FAR struct ftpd_session_s *session)
+{
+#ifdef CONFIG_HAVE_LONG_LONG
+    session->restartpos = (off_t)atoll(session->param);
+#else    
+    session->restartpos = (off_t)atoi(session->param);
+#endif
+    session->flags |= FTPD_SESSIONFLAG_RESTARTPOS;
+
+    return ftpd_response(session->cmd.sd, session->txtimeout,
+                         g_respfmt, 320, ' ', "Restart position ready");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_mdtm
+ ****************************************************************************/
+
+static int ftpd_command_mdtm(FAR struct ftpd_session_s *session)
+{
+  FAR char *abspath;
+  FAR char *path;
+  struct stat st;
+  struct tm tm;
+  int ret;
+
+  ret = ftpd_getpath(session, session->param, &abspath, NULL);
+  if (ret <0)
+    {
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 550, ' ', "Unknown size !");
+    }
+  path = abspath;
+
+  ret = stat(path, &st);
+  if (ret < 0)
+    {
+      free(abspath);
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           "%03u%c%s%s\r\n", 550, ' ', session->param,
+                           ": not a plain file.");
+    }
+
+    if (!S_ISREG(st.st_mode))
+      {
+        free(abspath);
+        return ftpd_response(session->cmd.sd, session->txtimeout,
+                             "%03u%c%s%s\r\n", 550, ' ', session->param,
+                             ": not a plain file.");
+    }
+    
+  free(abspath);
+  
+  memcpy(&tm, gmtime(&st.st_mtime), sizeof(tm)); 
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "%03u%c%04u%02u%02u%02u%02u%02u\r\n", 213, ' ',
+                       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+                       tm.tm_hour, tm.tm_min, tm.tm_sec);
+}
+
+/****************************************************************************
+ * Name: ftpd_command_opts
+ ****************************************************************************/
+
+static int ftpd_command_opts(FAR struct ftpd_session_s *session)
+{
+  FAR char *str;
+  FAR char *option;
+  FAR char *value;
+  bool remote = false;
+  bool local = false;
+
+  /* token: name and value */
+
+  str = session->param;
+  option = ftpd_strtok(true, " \t", &str);
+
+  /* Unlike the "real" strtok, ftpd_strtok does not NUL-terminate
+   * the returned string.
+   */
+
+  if (*str != '\0')
+    {
+      *str = '\0';
+      str++;
+    }
+  value = str;
+
+  if (strcasecmp(option, "UTF8") == 0 || strcasecmp(option, "UTF-8") == 0)
+    {
+      FAR char *lang;
+
+      if (value[0] == '\0' || strcasecmp(value, "ON") == 0 ||
+          strcasecmp(value, "ENABLE") == 0 || strcasecmp(value, "TRUE") == 0)
+        {
+            remote = true;
+        }
+        else {
+            remote = false;
+        }
+
+      lang = getenv("LANG");
+      if (lang)
+        {
+          if (ftpd_strcasestr(lang, "UTF8") != NULL ||
+              ftpd_strcasestr(lang, "UTF-8") != NULL)
+            {
+              local = true;
+            }
+          else
+            {
+              local = false;
+            }
+        }
+#if 1 /*  OPTION: UTF-8 is default */
+      else
+        {
+          local = true;
+        }
+#endif
+
+      if (remote != local)
+        {
+          return ftpd_response(session->cmd.sd, session->txtimeout,
+                               g_respfmt, 504, ' ', "UIF-8 disabled");
+        }
+
+      return ftpd_response(session->cmd.sd, session->txtimeout,
+                           g_respfmt, 200, ' ', "OK, UTF-8 enabled");
+    }
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "%03u%c%s%s%s\r\n", 501, ' ', "OPTS: ", option,
+                       " not understood");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_site
+ ****************************************************************************/
+
+static int ftpd_command_site(FAR struct ftpd_session_s *session)
+{
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       g_respfmt, 502, ' ', "SITE command not implemented !");
+}
+
+/****************************************************************************
+ * Name: ftpd_command_help
+ ****************************************************************************/
+
+static int ftpd_command_help(FAR struct ftpd_session_s *session)
+{
+  int index;
+  int ret;
+
+  index = 0;
+  while (g_ftpdhelp[index] != NULL)
+    {
+      if (index == 0 || g_ftpdhelp[index + 1] == NULL)
+        {
+          ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                              g_respfmt, 214,
+                              (g_ftpdhelp[index + 1] == NULL) ? ' ' : '-',
+                              g_ftpdhelp[index]);
+        }
+      else
+        {
+          ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                              "%c%s\r\n", ' ', g_ftpdhelp[index]);
+        }
+
+      if (ret < 0)
+        {
+          return ret;
+        }
+
+      index++;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: ftpd_command
+ ****************************************************************************/
+
+static int ftpd_command(FAR struct ftpd_session_s *session)
+{
+  int index = 0;
+  int ret;
+       
+  /* Clear immediately status (USER, REST, RNFR) */ 
+
+  session->flags &= ~(FTPD_SESSIONFLAG_USER|FTPD_SESSIONFLAG_RESTARTPOS|FTPD_SESSIONFLAG_RENAMEFROM);
+  if (session->user != NULL)
+    {
+      free(session->user);
+      session->user = NULL;
+    }
+
+  if (session->renamefrom != NULL)
+    {
+      free(session->renamefrom);
+      session->renamefrom = NULL;
+    }
+
+  session->restartpos = 0;
+
+  /* Search the command table for a matching command */
+ 
+  for (index = 0; g_ftpdcmdtab[index].cmd != NULL; index++)
+    {
+      /* Does the command string match this entry? */
+
+      if (strcmp(session->cmd, g_ftpdcmdtab[index].cmd) == 0)
+        {
+          /* Yes.. is a login required to execute this command? */
+ 
+          if ((g_ftpdcmdtab[index].flags & FTPD_CMDFLAG_LOGIN) != 0)
+            {
+              /* Yes... Check if the user is logged in */
+
+              if (session->curr == NULL && session->head != NULL)
+                {
+                  return ftpd_response(session->cmd.sd, session->txtimeout,
+                                       g_respfmt, 530, ' ',
+                                       "Please login with USER and PASS !");
+                }
+            }
+
+          /* Check if there is a handler for the command */
+
+          if (g_ftpdcmdtab[index].handler != NULL)
+            {
+              /* Yess.. invoke the command handler. */
+
+              return g_ftpdcmdtab[index].handler(session);
+            }
+
+          /* No... that is bad break out of the loop and send the 500 message */
+
+          break;
+        }
+    }
+
+  /* There is nothing in the command table matching this command */
+
+  return ftpd_response(session->cmd.sd, session->txtimeout,
+                       "%03u%c%s%s\r\n", 500, ' ', session->cmd,
+                       " not understood");
+}
+
+/****************************************************************************
+ * Worker Thread
+ ****************************************************************************/
+/****************************************************************************
+ * Name: ftpd_startworker
+ ****************************************************************************/
+
+static int ftpd_startworker(pthread_startroutine_t handler, FAR void *arg,
+                            size_t stacksize)
+{
+  pthread_t threadid;
+  pthread_attr_t attr;
+  int ret;
+
+  /* Initialize the thread attributes */
+
+  ret = pthread_attr_init(&attr);
+  if (ret != 0)
+    {
+      ndbg("pthread_attr_init() failed: %d\n", ret);
+      goto errout;
+    }
+
+  /* The the thread stack size */
+
+  ret = pthread_attr_setstacksize(&attr, stacksize);
+  if (ret != 0)
+    {
+      ndbg("pthread_attr_setstacksize() failed: %d\n", ret);
+      goto errout_with_attr;
+    }
+
+  /* Start the thread in the detached state */
+
+  ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED)
+  if (ret != 0)
+    {
+      ndbg("pthread_attr_setdetachstate() failed: %d\n", ret);
+      goto errout_with_attr;
+    }
+
+  /* And create the thread */
+
+  ret = pthread_create(&threadid, &attr, handler, arg);
+  if (ret != 0)
+    {
+      ndbg("pthread_create() failed: %d\n", ret);
+    }
+
+errout_with_attr:
+  pthread_attr_destroy(&attr);
+errout:
+  return -ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_freesession
+ ****************************************************************************/
+
+static void ftpd_freesession(FAR struct ftpd_session_s *session)
+{
+  /* Free resources */
+
+  if (session->renamefrom)
+    {
+      free(session->renamefrom);
+    }
+
+  if (session->work)
+    {
+      free(session->work);
+    }
+
+  if (session->home)
+    {
+      free(session->home);
+    }
+
+  if (session->user)
+    {
+      free((session->user);
+    }
+
+  if (session->fd < 0)
+    {
+      close(session->fd);
+    }
+
+  if (session->data.buffer)
+    {
+      free(session->data.buffer);
+    }
+
+  void)ftpd_dataclose(session);
+
+  if (session->cmd.buffer)
+    {
+      free((session->cmd.buffer);
+    }
+
+  if (session->cmd.sd <0)
+    {
+      close(session->cmd.sd);
+    }
+
+  free(session);
+}
+
+/****************************************************************************
+ * Name: ftpd_workersetup
+ ****************************************************************************/
+
+static void ftpd_workersetup(FAR struct ftpd_session_s *session)
+{
+#if defined(CONFIG_NET_HAVE_IPTOS) || defined(CONFIG_NET_HAVE_OOBINLINE)
+  int temp;
+#ifdef CONFIG_NET_HAVE_SOLINGER
+  struct linger ling;
+#endif
+
+#ifdef CONFIG_NET_HAVE_IPTOS
+  temp = IPTOS_LOWDELAY;
+  (void)setsockopt(session->cmd.sd, IPPROTO_IP, IP_TOS, &temp, sizeof(temp));
+#endif
+
+#ifdef CONFIG_NET_HAVE_OOBINLINE
+  temp = 1;
+  (void)setsockopt(session->cmd.sd, SOL_SOCKET, SO_OOBINLINE, &temp, sizeof(temp));
+#endif
+
+#ifdef CONFIG_NET_HAVE_SOLINGER
+  (void)memset(&ling, 0, sizeof(ling));
+  ling.l_onoff = 1;
+  ling.l_linger = 4;
+  (void)setsockopt(session->cmd.sd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
+#endif
+}
+
+/****************************************************************************
+ * Name: ftpd_worker
+ ****************************************************************************/
+
+static FAR void *ftpd_worker(FAR void *arg)
+{
+  FAR struct ftpd_session_s *session = (FAR struct ftpd_session_s *)arg;
+  ssize_t recvbytes;
+  size_t offset;
+  uint8_t ch;
+  int ret;
+
+  nvdbg("Worker started\n");
+  DEBUGASSERT(session);
+
+  /* Configure the session sockets */
+
+  ftpd_workersetup(session);
+
+  /* Send the welcoming message */
+
+  ret = ftpd_response(session->cmd.sd, session->txtimeout,
+                          g_respfmt, 220, ' ', CONFIG_FTPD_SERVERID);
+  if (ret < 0)
+    {
+      ndbg("ftpd_response() failed: %d\n", ret);
+      ftpd_freesession(session);
+      return NULL;
+    }
+
+  /* Then loop processing FTP commands */
+
+ for (;;)
+    {
+      /* Receive the next command */
+
+      recvbytes = ftpd_recv(session->cmd.sd, session->cmd.buffer,
+                            session->cmd.buflen - 1), session->rxtimeout);
+
+      /* recbytes < 0 is a receive failure (posibily a timeout); 
+       * recbytes == 0 indicates that we have lost the connection.
+       */
+
+      if (recvbytes <= 0)
+        {
+          /* Break out of the server loop */
+
+          break;
+        }
+
+      /* Make sure that the recevied string is NUL terminated */
+
+      session->cmd.buffer[recvbytes] = '\0';
+       
+      /* TELNET protocol (RFC854)
+       *   IAC   255(FFH) interpret as command:
+       *   IP    244(F4H) interrupt process--permanently
+       *   DM    242(F2H) data mark--for connect. cleaning
+       */
+
+      offset = 0;
+      while (recvbytes > 0)
+        {
+          ch = session->cmd.buffer[offset];
+            if (ch != 0xff && ch != 0xf4 && ch != 0xf2)
+              {
+                break;
+              }
+
+          (void)ftpd_send(session->cmd.sd, &session->cmd.buffer[offset], 1, session->txtimeout);
+
+          offset++;
+          recvbytes--;
+        }
+
+      /* Just continue if there was nothing of interest in the packet */
+
+      if (recvbytes <= 0)
+        {
+          continue;
+        }
+
+      /* Make command message */
+ 
+      session->cmd = &session->cmd.buffer[offset];
+      while (session->cmd.buffer[offset] != '\0')
+        {
+          if (session->cmd.buffer[offset] == '\r' &&
+              session->cmd.buffer[offset + ((ssize_t)1)] == '\n')
+            {
+              session->cmd.buffer[offset] = '\0';
+              break;
+            }
+          offset++;    
+        }
+
+      /* Parse command and param tokens */
+
+      session->param = session->cmd;
+      session->cmd   = ftpd_strtok(true, " \t", &session->param);
+
+      /* Unlike the "real" strtok, ftpd_strtok does not NUL-terminate
+       * the returned string.
+       */
+
+      if (session->param[0] != '\0')
+        {
+          session->param[0] = '\0';
+          session->param++;
+        }
+
+      /* Dispatch the FTP command */
+
+      ret = ftpd_command(session);
+      if (ret < 0)
+        {
+          ndbg("Disconnected by the command handler: %s\n", ret);
+          break;
+        }
+    }
+
+  ftpd_freesession(session);
+  return NULL;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ftpd_open
+ *
+ * Description:
+ *   Create an instance of the FTPD server and return a handle that can be
+ *   used to run the server.
+ *
+ * Input Parameters:
+ *    None
+ *
+ * Returned Value:
+ *   On success, a non-NULL handle is returned that can be used to reference
+ *   the server instance.
+ *
+ ****************************************************************************/
+
+FTPD_SESSION ftpd_open(void)
+{
+  FAR struct ftpd_server_s *server;
+
+  server = ftpd_openserver(21);
+  if (server == NULL)
+    {
+      server = ftpd_openserver(2211);
+    }
+
+  return (FTPD_SESSION)server;
+}
+
+/****************************************************************************
+ * Name: ftpd_adduser
+ *
+ * Description:
+ *   Add one FTP user.
+ *
+ * Input Parameters:
+ *    handle - A handle previously returned by ftpd_open
+ *    accountflags - The characteristics of this user (see FTPD_ACCOUNTFLAGS_*
+ *      defintiions.
+ *    user - The user login name. May be NULL indicating that no login is
+ *      required.
+ *    passwd - The user password.  May be NULL indicating that no password
+ *      is required.
+ *    home - The user home directory. May be NULL.
+ *
+ * Returned Value:
+ *   Zero is returned on success.  A negated errno value is return on
+ *   failure.
+ *
+ ****************************************************************************/
+
+int ftpd_adduser(FTPD_SESSION handle, uint8_t accountflags,
+                 FAR const char *user, FAR const char *passwd,
+                 FAR const char *home)
+{
+  FAR struct ftpd_server_s  *server;
+  FAR struct ftpd_account_s *newaccount;
+  int ret;
+
+  DEBUGASSERT(handle);
+
+  newaccount = ftpd_account_new(user, accountflags);
+  if (newaccount == NULL)
+    {
+      ndbg("Failed to allocte memory to the account\n");
+      ret = -ENOMEM;
+      goto errout;
+    }
+
+  ret = ftpd_account_setpassord(newaccount, passwd);
+  if (ret < 0)
+    {
+      ndbg("ftpd_account_setpassord failed: %d\n", ret);
+      goto errout_with_account;
+    }
+ 
+  ret = ftpd_account_sethome(newaccount, home);
+  if (ret < 0)
+    {
+      ndbg("ftpd_account_sethome failed: %d\n", ret);
+      goto errout_with_account;
+    }
+
+  server = (FAR struct ftpd_server_s *)handle;
+  ret = ftpd_account_add(server, newaccount);
+  if (ret < 0)
+    {
+      ndbg("ftpd_account_add failed: %d\n", ret);
+      goto errout_with_account;
+    }
+
+  return OK;
+
+errout_with_account:
+  ftpd_account_free(newaccount);
+  
+errout:
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_session
+ *
+ * Description:
+ *   Execute the FTPD server.  This thread does not return until either (1)
+ *   the timeout expires with no connection, (2) some other error occurs, or
+ *   (2) a connection was accepted and an FTP worker thread was started to
+ *   service the session.
+ *
+ * Input Parameters:
+ *   handle - A handle previously returned by ftpd_open
+ *   timeout - A time in milliseconds to wait for a connection. If this
+ *     time elapses with no connected, the -ETIMEDOUT error will be returned.
+ *
+ * Returned Value:
+ *   Zero is returned if the FTP worker was started.  On failure, a negated
+ *   errno value is returned to indicate why the servier terminated.
+ *   -ETIMEDOUT indicates that the user-provided timeout elapsed with no
+ *   connection.
+ *
+ ****************************************************************************/
+
+int ftpd_session(FTPD_SESSION handle, int timeout)
+{
+  FAR struct ftpd_server_s  *server;
+  FAR struct ftpd_session_s *session;
+  int ret;
+
+  DEBUGASSERT(handle);
+
+  server = (FAR struct ftpd_server_s *)handle;
+
+  /* Allocate a session */
+
+  session = (FAR struct ftpd_session_s *)zalloc(sizeof(struct ftpd_session_s));
+  if (session == NULL)
+    {
+      ret = -ENOMEM;
+      goto errout;
+    }
+
+  /* Initialize the session */
+
+  session->server       = server;
+  session->head         = server->head;
+  session->curr         = NULL;
+  session->flags        = 0;
+  session->txtimeout    = -1; 
+  session->rxtimeout    = -1; 
+  session->cmd.sd       = (int)(-1);
+  session->cmd.addrlen  = (socklen_t)sizeof(session->cmd.addr);
+  session->cmd.buflen   = (size_t)CONFIG_FTPD_CMDBUFFERSIZE;
+  session->cmd.buffer   = NULL;
+  session->cmd          = NULL;
+  session->param        = NULL;
+  session->data.sd      = -1;
+  session->data.addrlen = sizeof(session->data.addr);
+  session->data.buflen  = CONFIG_FTPD_DATABUFFERSIZE;
+  session->data.buffer  = NULL;
+  session->restartpos   = 0;
+  session->fd           = -1;
+  session->user         = NULL;
+  session->type         = FTPD_SESSIONTYPE_NONE;
+  session->home         = NULL;
+  session->work         = NULL;
+  session->renamefrom   = NULL;
+
+  /* Allocate a command buffer */
+
+  session->cmd.buffer = (uint8_t *)malloc(session->cmd.buflen);
+  if (session->cmd.buffer == NULL)
+    {
+      ret = -ENOMEM;
+      goto errout_with_session;
+    }
+
+  /* Allocate a data buffer */
+  
+  session->data.buffer = (uint8_t *)malloc(session->data.buflen);
+  if (session->data.buffer == NULL)
+    {
+      ret = -ENOMEM;
+      goto errout_with_session;
+    }
+
+  /* Accept a connection */
+
+  session->cmd.sd = ftpd_accept(server->sd, (FAR void *)(&session->cmd.addr),
+                                &session->cmd.addrlen, timeout);
+  if (session->cmd.sd < 0))
+    {
+      ret = -errno;
+      goto errout_with_session;
+    }
+
+  /* And create a worker thread to service the session */
+
+  ret = ftpd_startworker(ftpd_worker, (FAR void *)session,
+                         CONFIG_FTPD_WORKERSTACKSIZE);
+  if (ret < 0)
+    {
+      goto errout_with_session;
+    }
+
+  /* Successfully connected an launched the worker thread */
+
+  return 0;
+
+errout_with_session:
+  ftpd_freesession(session);
+errout:
+  return ret;
+}
+
+/****************************************************************************
+ * Name: ftpd_close
+ *
+ * Description:
+ *   Close and destroy the handle created by ftpd_open.
+ *
+ * Input Parameters:
+ *   handle - A handle previously returned by ftpd_open
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void ftpd_close(FTPD_SESSION handle)
+{
+  struct ftpd_server_s *server;
+  DEBUGASSERT(handle);
+
+  server = (struct ftpd_server_s *)handle;
+  ftpd_account_free(server->head);
+
+  if (server->sd != -1))
+    {
+      close(server->sd);
+      server->sd = -1;
+    }
+
+  free(server);
+}
+
diff --git a/apps/netutils/ftpd/ftpd.h b/apps/netutils/ftpd/ftpd.h
new file mode 100755
index 000000000..938ca4b89
--- /dev/null
+++ b/apps/netutils/ftpd/ftpd.h
@@ -0,0 +1,204 @@
+/****************************************************************************
+ * apps/include/ftpd.h
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_NETUTILS_FTPD_FTPD_H
+#define __APPS_NETUTILS_FTPD_FTPD_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdbool.h>
+
+#include <netinet/in.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* FPTD Definitions *********************************************************/
+
+# define FTPD_ACCOUNTFLAG_NONE       (0)
+# define FTPD_ACCOUNTFLAG_ADMIN      (1 << 0)
+# define FTPD_ACCOUNTFLAG_SYSTEM     (1 << 1)
+# define FTPD_ACCOUNTFLAG_GUEST      (1 << 2)
+
+# define FTPD_SESSIONFLAG_USER       (1 << 0)
+# define FTPD_SESSIONFLAG_RESTARTPOS (1 << 1)
+# define FTPD_SESSIONFLAG_RENAMEFROM (1 << 2)
+
+# define FTPD_LISTOPTION_A           (1 << 0)
+# define FTPD_LISTOPTION_L           (1 << 1)
+# define FTPD_LISTOPTION_F           (1 << 2)
+# define FTPD_LISTOPTION_R           (1 << 3)
+# define FTPD_LISTOPTION_UNKNOWN     (1 << 7)
+
+# define FTPD_CMDFLAG_LOGIN          (1 << 0)
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+/* This enumerates the type of each session */
+
+enum ftpd_sessiontype_e
+{
+  FTPD_SESSIONTYPE_NONE = 0
+  FTPD_SESSIONTYPE_A,
+  FTPD_SESSIONTYPE_I,
+  FTPD_SESSIONTYPE_L8
+};
+
+typedef struct ftpd_pathnode_s
+{
+  struct ftpd_pathnode_s *flink;
+  struct ftpd_pathnode_s *blink;
+  bool ignore;
+  FAR char *name;
+};
+
+union ftpd_sockaddr_u
+{
+  uint8_t raw[sizeof(struct sockaddr_storage)];
+  struct sockaddr_storage ss;
+  struct sockaddr sa;
+#ifdef CONFIG_NET_IPv6
+  struct sockaddr_in6 in6;
+#else
+  struct sockaddr_in in4;
+#endif
+};
+
+/* This structure describes on account */
+
+struct ftpd_account_s
+{
+  struct ftpd_account_s *blink;
+  struct ftpd_account_s *flink;
+  uint8_t flags;                 /* See FTPD_ACCOUNTFLAG_* definitions */
+  FAR char *user;                /* User name */
+  FAR char *password;            /* Un-encrypted password */
+  FAR char *home;                /* Home directory path */
+};
+
+/* This structures describes an FTP session a list of associated accounts */
+
+struct ftpd_server_s
+{
+  int                    sd;     /* Listen socket descriptor */
+  union ftpd_sockaddr_u  addr;   /* Listen address */
+  struct ftpd_account_s *head;   /* Head of a list of accounts */
+  struct ftpd_account_s *tail;   /* Tail of a list of accounts */
+};
+
+struct ftpd_stream_s
+{
+  int                   sd;      /* Socket descriptor */
+  union ftpd_sockaddr_u addr;    /* Network address */
+  socklen_t             addrlen; /* Length of the address */
+  size_t                buflen;  /* Length of the buffer */
+  uint8_t              *buffer;  /* Pointer to the buffer */
+};
+
+struct ftpd_session_s
+{
+  FAR struct ftpd_server_s   shadow;
+  FAR struct ftpd_account_s *head;
+  FAR struct ftpd_account_s *curr;
+  uint8_t flags;                /* See TPD_SESSIONFLAG_* definitions */
+  int txtimeout;
+  int txtimeout;
+
+  /* Command */
+
+  struct ftpd_stream_s cmd;
+  FAR char *cmd;
+  FAR char *param;
+
+  /* Data */
+
+  struct ftpd_stream_s data;
+  off_t restartpos;
+
+  /* File */
+
+  int fd;
+
+  /* Current user */
+
+  FAR char *user;
+  uint8_t m_type;    /* See enum ftpd_sessiontype_e */
+  FAR char *home;
+  FAR char *work;
+  FAR char *renamefrom;
+};
+
+typedef int (*ftpd_cmdhandler_t)(struct ftpd_session_s *);
+
+struct ftpd_cmd_s
+{
+  FAR const char *cmd;        /* The command string */
+  ftpd_cmdhandler_t handler;  /* The function that handles the command */
+  uint8_t flags;              /* See FTPD_CMDFLAGS_* definitions */
+};
+
+/* Used to maintain a list of protocol names */
+
+struct ftpd_protocol_s
+{
+  FAR const char *name;
+  int value;
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif /* __APPS_NETUTILS_FTPD_FTPD_H */
-- 
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