/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2013-2015 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include <config.h>

#include <stdlib.h>

#include <grp.h>

#include <sudo_compat.h>

#include <sudo_debug.h>

#include <sudo_fatal.h>

#include <sudo_gettext.h>

#include <sudo_util.h>

/*

 * Parse a comma-separated list of gids into an allocated array of GETGROUPS_T.

 * If a pointer to the base gid is specified, it is stored as the first element

 * in the array.

 * Returns the number of gids in the allocated array.

 */

int

sudo_parse_gids_v1(const char *gidstr, const gid_t *basegid, GETGROUPS_T **gidsp)

{

    int ngids = 0;

    GETGROUPS_T *gids;

    const char *cp = gidstr;

    const char *errstr;

    char *ep;

    debug_decl(sudo_parse_gids, SUDO_DEBUG_UTIL);

    /* Count groups. */

    if (*cp != '\0') {

  ngids++;

  do {

      if (*cp++ == ',')

    ngids++;

  } while (*cp != '\0');

    }

    /* Base gid is optional. */

    if (basegid != NULL)

  ngids++;

    /* Allocate and fill in array. */

    if (ngids != 0) {

  gids = reallocarray(NULL, (size_t)ngids, sizeof(GETGROUPS_T));

  if (gids == NULL) {

      sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));

      debug_return_int(-1);

  }

  ngids = 0;

  if (basegid != NULL)

      gids[ngids++] = *basegid;

  cp = gidstr;

  do {

      gids[ngids] = (GETGROUPS_T) sudo_strtoidx(cp, ",", &ep, &errstr);

      if (errstr != NULL) {

    sudo_warnx(U_("%s: %s"), cp, U_(errstr));

    free(gids);

    debug_return_int(-1);

      }

      if (basegid == NULL || gids[ngids] != *basegid)

    ngids++;

      cp = ep + 1;

  } while (*ep != '\0');

  *gidsp = gids;

    }

    debug_return_int(ngids);

}