text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific
   * language governing permissions and limitations under the License.
   *
   ****************************************************************************/
  /****************************************************************************
   * external/ftpc/ftpc_login.c
   *
   *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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 "ftpc_config.h"
  
  #include <string.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <protocols/ftpc.h>
  
  #include "ftpc_internal.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Private Types
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: ftpc_login
   *
   * Description:
   *   Log into the server
   *
   ****************************************************************************/
  
  int ftpc_login(SESSION handle, FAR struct ftpc_login_s *login)
  {
  	FAR struct ftpc_session_s *session = (FAR struct ftpc_session_s *)handle;
  	int err;
  	int ret;
  
  	/* Verify that we are connected to a server */
  
  	if (!ftpc_connected(session)) {
  		printf("Not connected\n");
  		err = ENOTCONN;
  		goto errout_with_err;
  	}
  
  	/* Verify that we are not already logged in to the server */
  
  	if (ftpc_loggedin(session)) {
  		printf("Already logged in\n");
  		err = EINVAL;
  		goto errout_with_err;
  	}
  
  	/* Save the login parameter */
  
  	session->uname = ftpc_dequote(login->uname);
  	session->pwd = ftpc_dequote(login->pwd);
  	session->initrdir = ftpc_dequote(login->rdir);
  
  	/* Is passive mode requested? */
  
  	FTPC_CLR_PASSIVE(session);
  	if (login->pasv) {
  		printf("Setting passive mode\n");
  		FTPC_SET_PASSIVE(session);
  	}
  
  	/* The (Re-)login to the server */
  
  	ret = ftpc_relogin(session);
  	if (ret != OK) {
  		printf("login failed: %d\n", errno);
  		goto errout;
  	}
  
  	return OK;
  
  errout_with_err:
  	set_errno(err);
  errout:
  	return ERROR;
  }
  
  /****************************************************************************
   * Name: ftpc_relogin
   *
   * Description:
   *   Log in again after a loss of connection
   *
   ****************************************************************************/
  
  int ftpc_relogin(FAR struct ftpc_session_s *session)
  {
  	int ret;
  
  	/* Log into the server.  First send the USER command.  The server may accept
  	 * USER with:
  	 *
  	 * - "230 User logged in, proceed" meaning that the client has permission to
  	 *    access files under that username
  	 * - "331 "User name okay, need password" or "332 Need account for login"
  	 *    meaning that permission might be granted after a PASS request.
  	 *
  	 * Or the server may reject USER with:
  	 *
  	 * - "530 Not logged in" meaning that the username is unacceptable.
  	 *
  	 * In practice, the server does not check the username until after a PASS
  	 * request
  	 */
  
  	FTPC_CLR_LOGGEDIN(session);
  	ret = ftpc_cmd(session, "USER %s", session->uname);
  	if (ret != OK) {
  		printf("USER %s cmd failed: %d\n", session->uname, errno);
  		return ERROR;
  	}
  
  	/* Send the PASS command with the passed. The server may accept PASS with:
  	 *
  	 * - "230 User logged in, proceed" meaning that the client has permission to
  	 *    access files under that username
  	 * - "202 Command not implemented, superfluous at this site" meaning that
  	 *    permission was already granted in response to USER
  	 * - "332 Need account for login" meaning that permission might be granted
  	 *    after an ACCT request.
  	 *
  	 * The server may reject PASS with:
  	 *
  	 * - "503 Bad sequence of commands" if the previous request was not USER
  	 * - "530 - Not logged in" if this username and password are unacceptable.
  	 */
  
  	ret = ftpc_cmd(session, "PASS %s", session->pwd);
  	if (ret != OK) {
  		printf("PASS %s cmd failed: %d\n", session->pwd, errno);
  		return ret;
  	}
  
  	/* We are logged in.. the current working directory on login is our "home"
  	 * directory.
  	 */
  
  	FTPC_SET_LOGGEDIN(session);
  	session->homerdir = ftpc_rpwd((SESSION)session);
  	session->currdir = strdup(session->homerdir);
  
  	/* If the user has requested a special start up directory, then change to
  	 * that directory now.
  	 */
  
  	if (session->initrdir) {
  		ftpc_chdir((SESSION)session, session->initrdir);
  	}
  
  	return OK;
  }
  