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 
41 int
add_group(group,gid)42 add_group(group, gid)
43 char *group;	/* name of group to add */
44 gid_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