ftp_file_access

#include <net_config.h>

BOOL ftp_file_access (
    U8* fname,       /* Requested file name.        */
    U8  mode,        /* Mode of a file access.      */
    U8  user_id );   /* User identification number. */

The ftp_file_access function checks if a file access is allowed for a specified user. This allows access protection of sensitive files. The access to protected files will be blocked for unprivileged users. Instead of this, the error code "550 Access is denied" will be returned to the client.

The argument fname points to a buffer containing the file name of a file, which the user is trying to access. The file name is a 0-terminated string.

The argument user_id is an user identification number, the same as it was returned from the ftp_check_account function. It identifies the user, who is trying to access the specified file.

The ftp_file_access function is in the FTP_MultiUser.c module. The prototype is defined in net_config.h.

note

• This function is optional. If the FTP file access restriction is not used, this function is not required.

The ftp_file_access function returns __TRUE if access to file is allowed, and __FALSE if access is forbidden.

ftp_check_account, ftp_get_user_id

BOOL ftp_file_access (U8 *fname, U8 mode, U8 user_id) {
  /* This function checks if file access for the user is allowed. */

  if (user_id == 3) {
    /* The user "Guest" has only read access rights. */
    switch (mode) {
      case 0:
      case 3:
        break;
      default:
        return (__FALSE);
    }
    return (__TRUE);
  }
  if (user_id == 2) {
    /* The user "Michael" is not allowed to modify/delete "Test.txt" */
    if (mode == 1 && strcmp ((char *)fname,"Test.txt") == 0) {
      return (__FALSE);
    }
  }
  return (__TRUE);
}