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/* groups -- print the groups a user is in
Copyright (C) 1989-2020 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 <https://www.gnu.org/licenses/>. */
/* Written by James Youngman based on id.c and groups.sh,
which were written by Arnold Robbins and David MacKenzie. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <getopt.h>
#include "system.h"
#include "die.h"
#include "group-list.h"
#include "quote.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "groups"
#define AUTHORS \
proper_name ("David MacKenzie"), \
proper_name ("James Youngman")
static struct option const longopts[] =
{
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("Usage: %s [OPTION]... [USERNAME]...\n"), program_name);
fputs (_("\
Print group memberships for each USERNAME or, if no USERNAME is specified, for\
\n\
the current process (which may differ if the groups database has changed).\n"),
stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
int optc;
bool ok = true;
gid_t rgid, egid;
uid_t ruid;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
/* Processing the arguments this way makes groups.c behave differently to
* groups.sh if one of the arguments is "--".
*/
while ((optc = getopt_long (argc, argv, "", longopts, NULL)) != -1)
{
switch (optc)
{
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
if (optind == argc)
{
/* No arguments. Divulge the details of the current process. */
uid_t NO_UID = -1;
gid_t NO_GID = -1;
errno = 0;
ruid = getuid ();
if (ruid == NO_UID && errno)
die (EXIT_FAILURE, errno, _("cannot get real UID"));
errno = 0;
egid = getegid ();
if (egid == NO_GID && errno)
die (EXIT_FAILURE, errno, _("cannot get effective GID"));
errno = 0;
rgid = getgid ();
if (rgid == NO_GID && errno)
die (EXIT_FAILURE, errno, _("cannot get real GID"));
if (!print_group_list (NULL, ruid, rgid, egid, true, ' '))
ok = false;
putchar ('\n');
}
else
{
/* At least one argument. Divulge the details of the specified users. */
for ( ; optind < argc; optind++)
{
struct passwd *pwd = getpwnam (argv[optind]);
if (pwd == NULL)
{
error (0, 0, _("%s: no such user"), quote (argv[optind]));
ok = false;
continue;
}
ruid = pwd->pw_uid;
rgid = egid = pwd->pw_gid;
printf ("%s : ", argv[optind]);
if (!print_group_list (argv[optind], ruid, rgid, egid, true, ' '))
ok = false;
putchar ('\n');
}
}
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
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