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: */
46 void errmsg(int, int);
47
48 /* Modify group to new gid and/or new name */
49 int
mod_group(char * group,gid_t gid,char * newgroup)50 mod_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