xref: /illumos-gate/usr/src/cmd/oamuser/group/add_group.c (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)
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 #include	<sys/types.h>
30 #include	<sys/stat.h>
31 #include	<stdio.h>
32 #include	<unistd.h>
33 #include	<userdefs.h>
34 
35 #define	GRPTMP		"/etc/gtmp"
36 #define	GRPBUFSIZ	5120
37 
38 int
add_group(group,gid)39 add_group(group, gid)
40 char *group;	/* name of group to add */
41 gid_t gid;		/* gid of group to add */
42 {
43 	FILE *etcgrp;		/* /etc/group file */
44 	FILE *etctmp;		/* temp file */
45 	int o_mask;		/* old umask value */
46 	int newdone = 0;	/* set true when new entry done */
47 	struct stat sb;		/* stat buf to copy modes */
48 	char buf[GRPBUFSIZ];
49 
50 	if ((etcgrp = fopen(GROUP, "r")) == NULL) {
51 		return (EX_UPDATE);
52 	}
53 
54 	if (fstat(fileno(etcgrp), &sb) < 0) {
55 		/* If we can't get mode, take a default */
56 		sb.st_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
57 	}
58 
59 	o_mask = umask(077);
60 	etctmp = fopen(GRPTMP, "w+");
61 	(void) umask(o_mask);
62 
63 	if (etctmp == NULL) {
64 		fclose(etcgrp);
65 		return (EX_UPDATE);
66 	}
67 
68 	if (fchmod(fileno(etctmp), sb.st_mode) != 0 ||
69 	    fchown(fileno(etctmp), sb.st_uid, sb.st_gid) != 0 ||
70 	    lockf(fileno(etctmp), F_LOCK, 0) != 0) {
71 		fclose(etcgrp);
72 		fclose(etctmp);
73 		unlink(GRPTMP);
74 		return (EX_UPDATE);
75 	}
76 
77 	while (fgets(buf, GRPBUFSIZ, etcgrp) != NULL) {
78 		/* Check for NameService reference */
79 		if (!newdone && (buf[0] == '+' || buf[0] == '-')) {
80 			(void) fprintf(etctmp, "%s::%u:\n", group, gid);
81 			newdone = 1;
82 		}
83 
84 		fputs(buf, etctmp);
85 	}
86 
87 
88 	(void) fclose(etcgrp);
89 
90 	if (!newdone) {
91 		(void) fprintf(etctmp, "%s::%u:\n", group, gid);
92 	}
93 
94 	if (rename(GRPTMP, GROUP) < 0) {
95 		fclose(etctmp);
96 		unlink(GRPTMP);
97 		return (EX_UPDATE);
98 	}
99 
100 	(void) fclose(etctmp);
101 
102 
103 	return (EX_SUCCESS);
104 }
105