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
)
42 int ret
, ngrp_saved
, num_gids
;
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 num_gids
= getgroups(0, NULL
);
82 if (num_gids
+ 1 > *grpcnt
) {
83 *grpcnt
= num_gids
+ 1;
86 ret
= getgroups(*grpcnt
- 1, &groups
[1]);
95 if (setgroups(ngrp_saved
, gids_saved
) != 0) {
97 DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
98 smb_panic("getgrouplist: failed to reset group list!\n");
108 int sys_getgrouplist(const char *user
, gid_t gid
, gid_t
*groups
, int *grpcnt
)
113 DEBUG(10,("sys_getgrouplist: user [%s]\n", user
));
115 /* see if we should disable winbindd lookups for local users */
116 if ( (p
= strchr(user
, *lp_winbind_separator())) == NULL
) {
117 if ( !winbind_off() )
118 DEBUG(0,("sys_getgroup_list: Insufficient environment space for %s\n",
121 DEBUG(10,("sys_getgrouplist(): disabled winbindd for group lookup [user == %s]\n",
125 #ifdef HAVE_GETGROUPLIST
126 retval
= getgrouplist(user
, gid
, groups
, grpcnt
);
129 retval
= getgrouplist_internals(user
, gid
, groups
, grpcnt
);
133 /* allow winbindd lookups */