summaryrefslogtreecommitdiff
path: root/src/group-list.c
blob: e48755a86f8de353e8ed65b0c516cddc14a3ff38 (plain)
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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
/* group-list.c --Print a list of group IDs or names.
   Copyright (C) 1989-2011 Free Software Foundation, Inc.

   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/>.  */

/* Written by Arnold Robbins.
   Major rewrite by David MacKenzie, djm@gnu.ai.mit.edu.
   Extracted from id.c by James Youngman. */

#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>

#include "system.h"
#include "error.h"
#include "mgetgroups.h"
#include "quote.h"
#include "group-list.h"


/* Print all of the distinct groups the user is in. */
extern bool
print_group_list (const char *username,
                  uid_t ruid, gid_t rgid, gid_t egid,
                  bool use_names)
{
  bool ok = true;
  struct passwd *pwd;

  pwd = getpwuid (ruid);
  if (pwd == NULL)
    ok = false;

  if (!print_group (rgid, use_names))
    ok = false;

  if (egid != rgid)
    {
      putchar (' ');
      if (!print_group (egid, use_names))
        ok = false;
    }

  {
    gid_t *groups;
    int i;

    int n_groups = xgetgroups (username, (pwd ? pwd->pw_gid : (gid_t) -1),
                               &groups);
    if (n_groups < 0)
      {
        if (username)
          {
            error (0, errno, _("failed to get groups for user %s"),
                   quote (username));
          }
        else
          {
            error (0, errno, _("failed to get groups for the current process"));
          }
        return false;
      }

    for (i = 0; i < n_groups; i++)
      if (groups[i] != rgid && groups[i] != egid)
        {
          putchar (' ');
          if (!print_group (groups[i], use_names))
            ok = false;
        }
    free (groups);
  }
  return ok;
}


/* Print the name or value of group ID GID. */
extern bool
print_group (gid_t gid, bool use_name)
{
  struct group *grp = NULL;
  bool ok = true;

  if (use_name)
    {
      grp = getgrgid (gid);
      if (grp == NULL)
        {
          error (0, 0, _("cannot find name for group ID %lu"),
                 (unsigned long int) gid);
          ok = false;
        }
    }

  if (grp == NULL)
    printf ("%lu", (unsigned long int) gid);
  else
    printf ("%s", grp->gr_name);
  return ok;
}