incubator-nuttx/libs/libc/pwd/lib_getpwnamr.c

/****************************************************************************
 * libs/libc/pwd/lib_getpwnamr.c
 *
 *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
 *   Author: Michael Jung <mijung@gmx.net>
 *
 * 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 <pwd.h>
#include <string.h>

#include "pwd/lib_pwd.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: getpwnam_r
 *
 * Description:
 *   The getpwnam_r() function searches the user database for an entry with a
 *   matching name and stores the retrieved passwd structure in the space
 *   pointed to by pwd.
 *
 * Input Parameters:
 *   name - The name to return a passwd structure for.
 *   pwd - Pointer to the space to store the retrieved passwd structure in.
 *   buf - The string fields pointed to by the passwd struct are stored here.
 *   buflen - The length of buf in bytes.
 *   result - Pointer to the resulting passwd struct, or NULL in case of fail.
 *
 * Returned Value:
 *   On success getpwnam_r returns 0 and sets *result to pwd.  If no match
 *   is found, 0 is returned and *result is set to NULL.  In case of failure
 *   an error number is returned.
 *
 ****************************************************************************/

int getpwnam_r(FAR const char *name, FAR struct passwd *pwd, FAR char *buf,
               size_t buflen, FAR struct passwd **result)
{
#ifdef CONFIG_LIBC_PASSWD_FILE
  int ret;

  ret = pwd_findby_name(name, pwd, buf, buflen);
  if (ret != 1)
    {
      *result = NULL;
      return ret < 0 ? -ret : 0;
    }

  *result = pwd;
  return 0;
#else
  if (strcmp(name, ROOT_NAME))
    {
      /* The only known user is 'root', which has a uid of 0.  Thus, report
       * back that no match was found.
       */

      *result = NULL;
      return 0;
    }

  return getpwbuf_r(ROOT_UID, ROOT_GID, ROOT_NAME, ROOT_DIR, ROOT_SHELL, pwd,
                    buf, buflen, result);
#endif
}