source: vendor/current/source3/lib/system_smbd.c@ 597

/* 
   Unix SMB/CIFS implementation.
   system call wrapper interface.
   Copyright (C) Andrew Tridgell 2002
   Copyright (C) Andrew Barteltt 2002

   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/>.
*/

/* 
   This file may assume linkage with smbd - for things like become_root()
   etc. 
*/

#include "includes.h"

#ifndef HAVE_GETGROUPLIST

#ifdef HAVE_GETGRSET
static int getgrouplist_getgrset(const char *user, gid_t gid, gid_t *groups,
                                 int *grpcnt)
{
        char *grplist;
        char *grp;
        gid_t temp_gid;
        int num_gids = 1;
        int ret = 0;
        long l;

        grplist = getgrset(user);

        DEBUG(10, ("getgrset returned %s\n", grplist));

        if (grplist == NULL) {
                return -1;
        }

        if (*grpcnt > 0) {
                groups[0] = gid;
        }

        while ((grp = strsep(&grplist, ",")) != NULL) {
                l = strtol(grp, NULL, 10);
                temp_gid = (gid_t) l;
                if (temp_gid == gid) {
                        continue;
                }

                if (num_gids + 1 > *grpcnt) {
                        num_gids++;
                        continue;
                }
                groups[num_gids++] = temp_gid;
        }
        free(grplist);

        if (num_gids > *grpcnt) {
                ret = -1;
        }
        *grpcnt = num_gids;

        DEBUG(10, ("Found %d groups for user %s\n", *grpcnt, user));

        return ret;
}

#else /* HAVE_GETGRSET */

/*
  This is a *much* faster way of getting the list of groups for a user
  without changing the current supplementary group list. The old
  method used getgrent() which could take 20 minutes on a really big
  network with hundeds of thousands of groups and users. The new method
  takes a couple of seconds.

  NOTE!! this function only works if it is called as root!
  */

static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
                                  int *grpcnt)
{
        gid_t *gids_saved;