glibc/posix/id.c

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/* 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 <libintl.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);
}