177 lines
3.5 KiB
C
177 lines
3.5 KiB
C
/* Copyright (C) 1991, 1995, 1997 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Library General Public License as
|
||
published by the Free Software Foundation; either version 2 of the
|
||
License, or (at your option) any later version.
|
||
|
||
The GNU C 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
|
||
Library General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Library General Public
|
||
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
||
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include <stdio.h>
|
||
#include <unistd.h>
|
||
#include <stdlib.h>
|
||
#include <grp.h>
|
||
#include <pwd.h>
|
||
#include <limits.h>
|
||
#include <sys/types.h>
|
||
|
||
|
||
static void
|
||
print_grpname (id, parens)
|
||
gid_t id;
|
||
int parens;
|
||
{
|
||
const struct group *const g = getgrgid (id);
|
||
if (g == NULL)
|
||
{
|
||
if (parens)
|
||
return;
|
||
else
|
||
{
|
||
fprintf (stderr, _("Couldn't find name for group %d\n"), id);
|
||
exit (EXIT_FAILURE);
|
||
}
|
||
}
|
||
|
||
if (parens)
|
||
printf ("(%s)", g->gr_name);
|
||
else
|
||
puts (g->gr_name);
|
||
}
|
||
|
||
static void
|
||
print_pwdname (id, parens)
|
||
uid_t id;
|
||
int parens;
|
||
{
|
||
const struct passwd *const p = getpwuid (id);
|
||
if (p == NULL)
|
||
{
|
||
if (parens)
|
||
return;
|
||
else
|
||
{
|
||
fprintf (stderr, _("Couldn't find name for user %d\n"), (int) id);
|
||
exit (EXIT_FAILURE);
|
||
}
|
||
}
|
||
|
||
if (parens)
|
||
printf ("(%s)", p->pw_name);
|
||
else
|
||
puts (p->pw_name);
|
||
}
|
||
|
||
int
|
||
main (argc, argv)
|
||
int argc;
|
||
char **argv;
|
||
{
|
||
int print_gid = 1, print_uid = 1;
|
||
int real = 0, name = 0;
|
||
int error = 0;
|
||
int c;
|
||
|
||
uid_t ruid = getuid (), euid = geteuid ();
|
||
gid_t rgid = getgid (), egid = getegid ();
|
||
|
||
while ((c = getopt (argc, argv, "gurn")) != -1)
|
||
switch (c)
|
||
{
|
||
default:
|
||
error = 1;
|
||
break;
|
||
|
||
case 'g':
|
||
print_gid = 1;
|
||
print_uid = 0;
|
||
break;
|
||
|
||
case 'u':
|
||
print_uid = 1;
|
||
print_gid = 0;
|
||
break;
|
||
|
||
case 'r':
|
||
real = 1;
|
||
break;
|
||
|
||
case 'n':
|
||
name = 1;
|
||
break;
|
||
}
|
||
|
||
if (error || argc != optind)
|
||
{
|
||
fputs (_("Usage: id [-gurn]\n"), stderr);
|
||
exit (EXIT_FAILURE);
|
||
}
|
||
|
||
if (print_uid && !print_gid)
|
||
{
|
||
const uid_t uid = real ? ruid : euid;
|
||
if (name)
|
||
print_pwdname (uid, 0);
|
||
else
|
||
printf ("%d\n", (int) uid);
|
||
}
|
||
else if (print_gid && !print_uid)
|
||
{
|
||
const gid_t gid = real ? rgid : egid;
|
||
if (name)
|
||
print_grpname (gid, 0);
|
||
else
|
||
printf ("%d\n", (int) gid);
|
||
}
|
||
else
|
||
{
|
||
#if NGROUPS_MAX > 0
|
||
gid_t groups[NGROUPS_MAX];
|
||
int ngroups;
|
||
ngroups = getgroups (NGROUPS_MAX, groups);
|
||
#endif
|
||
|
||
printf ("uid=%d", (int) ruid);
|
||
print_pwdname (ruid, 1);
|
||
printf (" gid=%d", (int) rgid);
|
||
print_grpname (rgid, 1);
|
||
if (euid != ruid)
|
||
{
|
||
printf (" euid=%d", (int) euid);
|
||
print_pwdname (euid, 1);
|
||
}
|
||
if (egid != rgid)
|
||
{
|
||
printf (" egid=%d", (int) egid);
|
||
print_grpname (egid, 1);
|
||
}
|
||
|
||
#if NGROUPS > 0
|
||
if (ngroups > 0)
|
||
{
|
||
size_t i;
|
||
printf (" groups=%d", (int) groups[0]);
|
||
print_grpname (groups[0], 1);
|
||
for (i = 1; i < ngroups; ++i)
|
||
{
|
||
printf (", %d", (int) groups[i]);
|
||
print_grpname (groups[i], 1);
|
||
}
|
||
}
|
||
#endif
|
||
|
||
putchar ('\n');
|
||
}
|
||
|
||
exit (EXIT_SUCCESS);
|
||
}
|