1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33#include <sys/types.h>
34#include <stdio.h>
35#include <ctype.h>
36#include <grp.h>
37#include <sys/stat.h>
38#include <unistd.h>
39#include <userdefs.h>
40#include <strings.h>
41#include <stdlib.h>
42#include "users.h"
43#include "messages.h"
44
45/* lint error-killers: */
46void errmsg(int, int);
47
48/* Modify group to new gid and/or new name */
49int
50mod_group(char *group, gid_t gid, char *newgroup)
51{
52	int modified = 0;
53	int fd;
54	char tname[] = "/etc/gtmp.XXXXXX";
55	FILE *e_fptr, *t_fptr;
56	struct group *g_ptr;
57	struct stat sbuf;
58	boolean_t haserr;
59	int line = 1;
60
61	if ((e_fptr = fopen(GROUP, "r")) == NULL)
62		return (EX_UPDATE);
63
64	if (fstat(fileno(e_fptr), &sbuf) != 0)
65		return (EX_UPDATE);
66
67	if ((fd = mkstemp(tname)) == -1)
68		return (EX_UPDATE);
69
70	if ((t_fptr = fdopen(fd, "w")) == NULL) {
71		(void) close(fd);
72		(void) unlink(tname);
73		return (EX_UPDATE);
74	}
75
76	/*
77	 * Get ownership and permissions correct
78	 */
79
80	if (fchmod(fd, sbuf.st_mode) != 0 ||
81	    fchown(fd, sbuf.st_uid, sbuf.st_gid) != 0) {
82		(void) fclose(t_fptr);
83		(void) unlink(tname);
84		return (EX_UPDATE);
85	}
86
87	while ((g_ptr = fgetgrent(e_fptr)) != NULL) {
88
89		/* check to see if group is one to modify */
90		if (strcmp(g_ptr->gr_name, group) == 0) {
91			if (newgroup != NULL)
92				g_ptr->gr_name = newgroup;
93			if (gid != -1)
94				g_ptr->gr_gid = gid;
95			modified++;
96		}
97		putgrent(g_ptr, t_fptr);
98		line++;
99	}
100
101	haserr = !feof(e_fptr);
102	if (haserr)
103		errmsg(M_SYNTAX, line);
104
105	(void) fclose(e_fptr);
106
107	if (fclose(t_fptr) != 0 || haserr) {
108		/* GROUP file contains bad entries or write failed. */
109		(void) unlink(tname);
110		return (EX_UPDATE);
111	}
112
113	if (modified) {
114		if (rename(tname, GROUP) != 0) {
115			(void) unlink(tname);
116			return (EX_UPDATE);
117		}
118		return (EX_SUCCESS);
119	} else {
120		(void) unlink(tname);
121		return (EX_NAME_NOT_EXIST);
122	}
123}
124