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/*
* Copyright (c) 1991 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2001 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* id - print current process user identification information
*
* Print the current process identifiers. This includes the
* UID, GID, effective-UID and effective-GID. Optionally print
* the concurrent group set if the current system supports it.
*/
#include <config.h>
#ident "$Id: id.c 3182 2010-03-23 11:26:34Z nekral-guest $"
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <sys/types.h>
#include "defines.h"
/* local function prototypes */
static void usage (void);
static void usage (void)
{
#ifdef HAVE_GETGROUPS
(void) fputs (_("Usage: id [-a]\n"), stderr);
#else
(void) fputs (_("Usage: id\n"), stderr);
#endif
exit (EXIT_FAILURE);
}
/*ARGSUSED*/ int main (int argc, char **argv)
{
uid_t ruid, euid;
gid_t rgid, egid;
long sys_ngroups;
/*
* This block of declarations is particularly strained because of several
* different ways of doing concurrent groups. Old BSD systems used int for
* gid's, but short for the type passed to getgroups(). Newer systems use
* gid_t for everything. Some systems have a small and fixed NGROUPS,
* usually about 16 or 32. Others use bigger values.
*/
#ifdef HAVE_GETGROUPS
GETGROUPS_T *groups;
int ngroups;
bool aflg = 0;
#endif
struct passwd *pw;
struct group *gr;
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
/*
* Dynamically get the maximum number of groups from system, instead
* of using the symbolic constant NGROUPS_MAX. This ensures that the
* group limit is not hard coded into the binary, so it will still
* work if the system library is recompiled.
*/
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
#ifdef HAVE_GETGROUPS
groups = (GETGROUPS_T *) malloc (sizeof (GETGROUPS_T) * sys_ngroups);
/*
* See if the -a flag has been given to print out the concurrent
* group set.
*/
if (argc > 1) {
if ((argc > 2) || (strcmp (argv[1], "-a") != 0)) {
usage ();
} else {
aflg = true;
}
}
#else
if (argc > 1) {
usage ();
}
#endif
ruid = getuid ();
euid = geteuid ();
rgid = getgid ();
egid = getegid ();
/*
* Print out the real user ID and group ID. If the user or group
* does not exist, just give the numerical value.
*/
pw = getpwuid (ruid); /* local, no need for xgetpwuid */
if (NULL != pw) {
(void) printf ("UID=%lu(%s)",
(unsigned long) ruid, pw->pw_name);
} else {
(void) printf ("UID=%lu", (unsigned long) ruid);
}
gr = getgrgid (rgid);; /* local, no need for xgetgrgid */
if (NULL != gr) {
(void) printf (" GID=%lu(%s)",
(unsigned long) rgid, gr->gr_name);
} else {
(void) printf (" GID=%lu", (unsigned long) rgid);
}
/*
* Print out the effective user ID and group ID if they are
* different from the real values.
*/
if (ruid != euid) {
pw = getpwuid (euid); /* local, no need for xgetpwuid */
if (NULL != pw) {
(void) printf (" EUID=%lu(%s)",
(unsigned long) euid, pw->pw_name);
} else {
(void) printf (" EUID=%lu", (unsigned long) euid);
}
}
if (rgid != egid) {
gr = getgrgid (egid); /* local, no need for xgetgrgid */
if (NULL != gr) {
(void) printf (" EGID=%lu(%s)",
(unsigned long) egid, gr->gr_name);
} else {
(void) printf (" EGID=%lu", (unsigned long) egid);
}
}
#ifdef HAVE_GETGROUPS
/*
* Print out the concurrent group set if the user has requested it.
* The group numbers will be printed followed by their names.
*/
if (aflg && (ngroups = getgroups (sys_ngroups, groups)) != -1) {
int i;
/*
* Start off the group message. It will be of the format
*
* groups=###(aaa),###(aaa),###(aaa)
*
* where "###" is a numerical value and "aaa" is the
* corresponding name for each respective numerical value.
*/
(void) puts (_(" groups="));
for (i = 0; i < ngroups; i++) {
if (0 != i)
(void) putchar (',');
/* local, no need for xgetgrgid */
gr = getgrgid (groups[i]);
if (NULL != gr) {
(void) printf ("%lu(%s)",
(unsigned long) groups[i],
gr->gr_name);
} else {
(void) printf ("%lu",
(unsigned long) groups[i]);
}
}
}
free (groups);
#endif
/*
* Finish off the line.
*/
(void) putchar ('\n');
return EXIT_SUCCESS;
}
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