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write-any-file.c

/* Determine whether we can write any file.

   Copyright (C) 2007 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Paul Eggert.  */

#include <config.h>

#include "write-any-file.h"

#if HAVE_PRIV_H
# include <priv.h>
#endif
#include <unistd.h>

/* Return true if we know that we can write any file, including
   writing directories.  */

bool
can_write_any_file (void)
{
  static bool initialized;
  static bool can_write;

  if (! initialized)
    {
      bool can = false;
#if defined PRIV_EFFECTIVE && defined PRIV_FILE_DAC_WRITE
      priv_set_t *pset = priv_allocset ();
      if (pset)
      {
        can =
          (getppriv (PRIV_EFFECTIVE, pset) == 0
           && priv_ismember (pset, PRIV_FILE_DAC_WRITE));
        priv_freeset (pset);
      }
#else
      /* In traditional Unix, only root can unlink directories.  */
      can = (geteuid () == 0);
#endif
      can_write = can;
      initialized = true;
    }

  return can_write;
}

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