2 Unix SMB/CIFS implementation.
3 system call wrapper interface.
4 Copyright (C) Andrew Tridgell 2002
5 Copyright (C) Andrew Barteltt 2002
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 This file may assume linkage with smbd - for things like become_root()
29 #ifndef HAVE_GETGROUPLIST
31 This is a *much* faster way of getting the list of groups for a user
32 without changing the current supplemenrary group list. The old
33 method used getgrent() which could take 20 minutes on a really big
34 network with hundeds of thousands of groups and users. The new method
35 takes a couple of seconds.
37 NOTE!! this function only works if it is called as root!
39 static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
44 if (non_root_mode()) {
49 /* work out how many groups we need to save */
50 ngrp_saved = getgroups(0, NULL);
51 if (ngrp_saved == -1) {
52 /* this shouldn't happen */
56 gids_saved = (gid_t *)malloc(sizeof(gid_t) * (ngrp_saved+1));
62 ngrp_saved = getgroups(ngrp_saved, gids_saved);
63 if (ngrp_saved == -1) {
64 SAFE_FREE(gids_saved);
69 if (initgroups(user, gid) != 0) {
70 DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
71 SAFE_FREE(gids_saved);
75 /* this must be done to cope with systems that put the current egid in the
76 return from getgroups() */
78 set_effective_gid(gid);
81 ret = getgroups(*grpcnt, groups);
88 if (setgroups(ngrp_saved, gids_saved) != 0) {
90 DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
91 smb_panic("getgrouplist: failed to reset group list!\n");
101 int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
103 #ifdef HAVE_GETGROUPLIST
104 return getgrouplist(user, gid, groups, grpcnt);
108 retval = getgrouplist_internals(user, gid, groups, grpcnt);