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/*
* Copyright (c) 1991 - 1993, 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.
*/
#include <config.h>
#ident "$Id$"
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include "defines.h"
#include "prototypes.h"
/*
* Global variables
*/
const char *Prog;
/* local function prototypes */
static void print_groups (const char *member);
/*
* print_groups - print the groups which the named user is a member of
*
* print_groups() scans the groups file for the list of groups which
* the user is listed as being a member of.
*/
static void print_groups (const char *member)
{
int groups = 0;
struct group *grp;
struct passwd *pwd;
bool flag = false;
pwd = getpwnam (member); /* local, no need for xgetpwnam */
if (NULL == pwd) {
(void) fprintf (stderr, _("%s: unknown user %s\n"),
Prog, member);
exit (EXIT_FAILURE);
}
setgrent ();
while ((grp = getgrent ()) != NULL) {
if (is_on_list (grp->gr_mem, member)) {
if (0 != groups) {
(void) putchar (' ');
}
groups++;
(void) printf ("%s", grp->gr_name);
if (grp->gr_gid == pwd->pw_gid) {
flag = true;
}
}
}
endgrent ();
/* The user may not be in the list of members of its primary group */
if (!flag) {
grp = getgrgid (pwd->pw_gid); /* local, no need for xgetgrgid */
if (NULL != grp) {
if (0 != groups) {
(void) putchar (' ');
}
groups++;
(void) printf ("%s", grp->gr_name);
}
}
if (0 != groups) {
(void) putchar ('\n');
}
}
/*
* groups - print out the groups a process is a member of
*/
int main (int argc, char **argv)
{
#ifdef HAVE_GETGROUPS
long sys_ngroups;
GETGROUPS_T *groups;
#else
char *logname;
char *getlogin ();
#endif
#ifdef HAVE_GETGROUPS
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
groups = (GETGROUPS_T *) malloc (sizeof (GETGROUPS_T) * sys_ngroups);
#endif
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
/*
* Get the program name so that error messages can use it.
*/
Prog = Basename (argv[0]);
if (argc == 1) {
/*
* Called with no arguments - give the group set for the
* current user.
*/
#ifdef HAVE_GETGROUPS
int i;
int pri_grp; /* TODO: should be GETGROUPS_T */
/*
* This system supports concurrent group sets, so I can ask
* the system to tell me which groups are currently set for
* this process.
*/
int ngroups = getgroups (sys_ngroups, groups);
if (ngroups < 0) {
perror ("getgroups");
exit (EXIT_FAILURE);
}
/*
* The groupset includes the primary group as well.
*/
pri_grp = getegid ();
for (i = 0; i < ngroups; i++) {
if (pri_grp == (int) groups[i]) {
break;
}
}
if (i != ngroups) {
pri_grp = -1;
}
/*
* Print out the name of every group in the current group
* set. Unknown groups are printed as their decimal group ID
* values.
*/
if (-1 != pri_grp) {
struct group *gr;
/* local, no need for xgetgrgid */
gr = getgrgid (pri_grp);
if (NULL != gr) {
(void) printf ("%s", gr->gr_name);
} else {
(void) printf ("%d", pri_grp);
}
}
for (i = 0; i < ngroups; i++) {
struct group *gr;
if ((0 != i) || (-1 != pri_grp)) {
(void) putchar (' ');
}
/* local, no need for xgetgrgid */
gr = getgrgid (groups[i]);
if (NULL != gr) {
(void) printf ("%s", gr->gr_name);
} else {
(void) printf ("%ld", (long) groups[i]);
}
}
(void) putchar ('\n');
#else
/*
* This system does not have the getgroups() system call, so
* I must check the groups file directly.
*/
logname = getlogin ();
if (NULL != logname) {
print_groups (logname);
} else {
exit (EXIT_FAILURE);
}
#endif
} else {
/*
* The invoker wanted to know about some other user. Use
* that name to look up the groups instead.
*/
print_groups (argv[1]);
}
return EXIT_SUCCESS;
}
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