shadow/src/groupdel.c

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/*
* Copyright 1991 - 1994, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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>
#include "rcsid.h"
RCSID(PKG_VER "$Id: groupdel.c,v 1.10 1999/06/07 16:40:45 marekm Exp $")
#include <sys/types.h>
#include <stdio.h>
#include <grp.h>
#include <ctype.h>
#include <fcntl.h>
#include <pwd.h>
#include "prototypes.h"
#include "defines.h"
static char *group_name;
static char *Prog;
static int errors;
#ifdef NDBM
extern int gr_dbm_mode;
extern int sg_dbm_mode;
#endif
#include "groupio.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
static int is_shadow_grp;
#endif
/*
* exit status values
*/
#define E_SUCCESS 0 /* success */
#define E_USAGE 2 /* invalid command syntax */
#define E_NOTFOUND 6 /* specified group doesn't exist */
#define E_GROUP_BUSY 8 /* can't remove user's primary group */
#define E_GRP_UPDATE 10 /* can't update group file */
/* local function prototypes */
static void usage P_((void));
static void grp_update P_((void));
static void close_files P_((void));
static void open_files P_((void));
static void group_busy P_((gid_t));
int main P_((int, char **));
/*
* usage - display usage message and exit
*/
static void
usage(void)
{
fprintf(stderr, _("usage: groupdel group\n"));
exit(E_USAGE);
}
/*
* grp_update - update group file entries
*
* grp_update() writes the new records to the group files.
*/
static void
grp_update(void)
{
#ifdef NDBM
struct group *ogrp;
#endif
if (!gr_remove(group_name)) {
fprintf(stderr, _("%s: error removing group entry\n"), Prog);
errors++;
}
#ifdef NDBM
/*
* Update the DBM group file
*/
if (gr_dbm_present()) {
if ((ogrp = getgrnam (group_name)) &&
! gr_dbm_remove (ogrp)) {
fprintf(stderr, _("%s: error removing group dbm entry\n"),
Prog);
errors++;
}
}
endgrent ();
#endif /* NDBM */
#ifdef SHADOWGRP
/*
* Delete the shadow group entries as well.
*/
if (is_shadow_grp && ! sgr_remove (group_name)) {
fprintf(stderr, _("%s: error removing shadow group entry\n"),
Prog);
errors++;
}
#ifdef NDBM
/*
* Update the DBM shadow group file
*/
if (is_shadow_grp && sg_dbm_present()) {
if (! sg_dbm_remove (group_name)) {
fprintf(stderr,
_("%s: error removing shadow group dbm entry\n"),
Prog);
errors++;
}
}
endsgent ();
#endif /* NDBM */
#endif /* SHADOWGRP */
SYSLOG((LOG_INFO, "remove group `%s'\n", group_name));
return;
}
/*
* close_files - close all of the files that were opened
*
* close_files() closes all of the files that were opened for this
* new group. This causes any modified entries to be written out.
*/
static void
close_files(void)
{
if (!gr_close()) {
fprintf(stderr, _("%s: cannot rewrite group file\n"), Prog);
errors++;
}
gr_unlock();
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_close()) {
fprintf(stderr, _("%s: cannot rewrite shadow group file\n"),
Prog);
errors++;
}
if (is_shadow_grp)
sgr_unlock();
#endif /* SHADOWGRP */
}
/*
* open_files - lock and open the group files
*
* open_files() opens the two group files.
*/
static void
open_files(void)
{
if (!gr_lock()) {
fprintf(stderr, _("%s: unable to lock group file\n"), Prog);
exit(E_GRP_UPDATE);
}
if (!gr_open(O_RDWR)) {
fprintf(stderr, _("%s: unable to open group file\n"), Prog);
exit(E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_lock()) {
fprintf(stderr, _("%s: unable to lock shadow group file\n"),
Prog);
exit(E_GRP_UPDATE);
}
if (is_shadow_grp && !sgr_open(O_RDWR)) {
fprintf(stderr, _("%s: unable to open shadow group file\n"),
Prog);
exit(E_GRP_UPDATE);
}
#endif /* SHADOWGRP */
}
/*
* group_busy - check if this is any user's primary group
*
* group_busy verifies that this group is not the primary group
* for any user. You must remove all users before you remove
* the group.
*/
static void
group_busy(gid_t gid)
{
struct passwd *pwd;
/*
* Nice slow linear search.
*/
setpwent ();
while ((pwd = getpwent ()) && pwd->pw_gid != gid)
;
endpwent ();
/*
* If pwd isn't NULL, it stopped becaues the gid's matched.
*/
if (pwd == (struct passwd *) 0)
return;
/*
* Can't remove the group.
*/
fprintf(stderr, _("%s: cannot remove user's primary group.\n"), Prog);
exit(E_GROUP_BUSY);
}
/*
* main - groupdel command
*
* The syntax of the groupdel command is
*
* groupdel group
*
* The named group will be deleted.
*/
int
main(int argc, char **argv)
{
struct group *grp;
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename(argv[0]);
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
if (argc != 2)
usage ();
group_name = argv[1];
openlog(Prog, LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
#ifdef SHADOWGRP
is_shadow_grp = sgr_file_present();
#endif
/*
* The open routines for the DBM files don't use read-write
* as the mode, so we have to clue them in.
*/
#ifdef NDBM
gr_dbm_mode = O_RDWR;
#ifdef SHADOWGRP
sg_dbm_mode = O_RDWR;
#endif /* SHADOWGRP */
#endif /* NDBM */
/*
* Start with a quick check to see if the group exists.
*/
if (! (grp = getgrnam(group_name))) {
fprintf(stderr, _("%s: group %s does not exist\n"),
Prog, group_name);
exit(E_NOTFOUND);
}
#ifdef USE_NIS
/*
* Make sure this isn't a NIS group
*/
if (__isgrNIS ()) {
char *nis_domain;
char *nis_master;
fprintf(stderr, _("%s: group %s is a NIS group\n"),
Prog, group_name);
if (! yp_get_default_domain (&nis_domain) &&
! yp_master (nis_domain, "group.byname",
&nis_master)) {
fprintf (stderr, _("%s: %s is the NIS master\n"),
Prog, nis_master);
}
exit(E_NOTFOUND);
}
#endif
/*
* Now check to insure that this isn't the primary group of
* anyone.
*/
group_busy (grp->gr_gid);
/*
* Do the hard stuff - open the files, delete the group entries,
* then close and update the files.
*/
open_files ();
grp_update ();
close_files ();
exit(errors == 0 ? E_SUCCESS : E_GRP_UPDATE);
/*NOTREACHED*/
}