1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
lookup_groupbyuser.c - simple lookup for groups by user
Copyright (C) 2014 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <grp.h>
#ifndef HAVE_GETGROUPLIST
/* dummy implementation that for systems without getgrouplist() */
int main(int argc,char *argv[])
{
fprintf(stderr, "%s: getgrouplist() not available\n", argv[0]);
return 1;
}
#else /* HAVE_GETGROUPLIST */
/* the main program... */
int main(int argc,char *argv[])
{
gid_t groups[1024];
int ngroups = sizeof(groups);
int i;
/* check arguments */
if ((argc != 1) && (argc != 2))
{
fprintf(stderr, "Usage: %s [USERNAME]\n", argv[0]);
exit(EXIT_FAILURE);
}
/* start lookup */
if (getgrouplist(argv[1], (gid_t)-1, groups, &ngroups) < 0)
{
fprintf(stderr, "getgrouplist() failed (%d entries would be returned)\n",
ngroups);
exit(EXIT_FAILURE);
}
/* print results */
printf("user=%s groups=", argv[1]);
for (i = 0; i < ngroups; i++)
{
if (groups[i] != (gid_t)-1)
{
if (i > 0)
printf(",");
printf("%d", groups[i]);
}
}
printf("\n");
return 0;
}
#endif /* HAVE_GETGROUPLIST */
|
