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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
27/*	All Rights Reserved	*/
28
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.3 */
31
32#include	<sys/types.h>
33#include	<sys/stat.h>
34#include	<stdio.h>
35#include	<unistd.h>
36#include	<userdefs.h>
37
38#define	GRPTMP		"/etc/gtmp"
39#define	GRPBUFSIZ	5120
40
41int
42add_group(group, gid)
43char *group;	/* name of group to add */
44gid_t gid;		/* gid of group to add */
45{
46	FILE *etcgrp;		/* /etc/group file */
47	FILE *etctmp;		/* temp file */
48	int o_mask;		/* old umask value */
49	int newdone = 0;	/* set true when new entry done */
50	struct stat sb;		/* stat buf to copy modes */
51	char buf[GRPBUFSIZ];
52
53	if ((etcgrp = fopen(GROUP, "r")) == NULL) {
54		return (EX_UPDATE);
55	}
56
57	if (fstat(fileno(etcgrp), &sb) < 0) {
58		/* If we can't get mode, take a default */
59		sb.st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
60	}
61
62	o_mask = umask(077);
63	etctmp = fopen(GRPTMP, "w+");
64	(void) umask(o_mask);
65
66	if (etctmp == NULL) {
67		fclose(etcgrp);
68		return (EX_UPDATE);
69	}
70
71	if (fchmod(fileno(etctmp), sb.st_mode) != 0 ||
72	    fchown(fileno(etctmp), sb.st_uid, sb.st_gid) != 0 ||
73	    lockf(fileno(etctmp), F_LOCK, 0) != 0) {
74		fclose(etcgrp);
75		fclose(etctmp);
76		unlink(GRPTMP);
77		return (EX_UPDATE);
78	}
79
80	while (fgets(buf, GRPBUFSIZ, etcgrp) != NULL) {
81		/* Check for NameService reference */
82		if (!newdone && (buf[0] == '+' || buf[0] == '-')) {
83			(void) fprintf(etctmp, "%s::%u:\n", group, gid);
84			newdone = 1;
85		}
86
87		fputs(buf, etctmp);
88	}
89
90
91	(void) fclose(etcgrp);
92
93	if (!newdone) {
94		(void) fprintf(etctmp, "%s::%u:\n", group, gid);
95	}
96
97	if (rename(GRPTMP, GROUP) < 0) {
98		fclose(etctmp);
99		unlink(GRPTMP);
100		return (EX_UPDATE);
101	}
102
103	(void) fclose(etctmp);
104
105
106	return (EX_SUCCESS);
107}
108