1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/stat.h>
#include <grp.h>
#include <unistd.h>
#include <userdefs.h>
#include <errno.h>
#include <limits.h>
#include "users.h"
#include "messages.h"
#define MYBUFSIZE (LINE_MAX)
/* Corresponds to MYBUFSIZE in grpck.c, BUFCONST in nss_dbdefs.c */
int
edit_group(char *login, char *new_login, gid_t gids[], int overwrite)
{
char **memptr;
char t_name[] = "/etc/gtmp.XXXXXX";
int fd;
FILE *e_fptr, *t_fptr;
struct group *g_ptr; /* group structure from fgetgrent */
int i;
int modified = 0;
struct stat sbuf;
int bufsize, g_length, sav_errno;
long g_curr = 0L;
char *g_string, *new_g_string, *gstr_off;
if ((e_fptr = fopen(GROUP, "r")) == NULL)
return (EX_UPDATE);
if (fstat(fileno(e_fptr), &sbuf) != 0) {
(void) fclose(e_fptr);
return (EX_UPDATE);
}
if ((fd = mkstemp(t_name)) == -1) {
(void) fclose(e_fptr);
return (EX_UPDATE);
}
if ((t_fptr = fdopen(fd, "w")) == NULL) {
(void) close(fd);
(void) unlink(t_name);
(void) fclose(e_fptr);
return (EX_UPDATE);
}
/*
* Get ownership and permissions correct
*/
if (fchmod(fd, sbuf.st_mode) != 0 ||
fchown(fd, sbuf.st_uid, sbuf.st_gid) != 0) {
(void) fclose(t_fptr);
(void) fclose(e_fptr);
(void) unlink(t_name);
return (EX_UPDATE);
}
g_curr = ftell(e_fptr);
/* Make TMP file look like we want GROUP file to look */
bufsize = MYBUFSIZE;
if ((g_string = malloc(bufsize)) == NULL) {
(void) fclose(t_fptr);
(void) fclose(e_fptr);
(void) unlink(t_name);
return (EX_UPDATE);
}
/*
* bufsize contains the size of the currently allocated buffer
* buffer size, which is initially MYBUFSIZE but when a line
* greater than MYBUFSIZE is encountered then bufsize gets increased
* by MYBUFSIZE.
* g_string always points to the beginning of the buffer (even after
* realloc()).
* gstr_off = g_string + MYBUFSIZE * (n), where n >= 0.
*/
while (!feof(e_fptr) && !ferror(e_fptr)) {
g_length = 0;
gstr_off = g_string;
while (fgets(gstr_off, (bufsize - g_length), e_fptr) != NULL) {
g_length += strlen(gstr_off);
if (g_string[g_length - 1] == '\n' || feof(e_fptr))
break;
new_g_string = realloc(g_string, (bufsize + MYBUFSIZE));
if (new_g_string == NULL) {
free(g_string);
(void) fclose(t_fptr);
(void) fclose(e_fptr);
(void) unlink(t_name);
return (EX_UPDATE);
}
bufsize += MYBUFSIZE;
g_string = new_g_string;
gstr_off = g_string + g_length;
}
if (g_length == 0) {
continue;
}
/* While there is another group string */
(void) fseek(e_fptr, g_curr, SEEK_SET);
errno = 0;
g_ptr = fgetgrent(e_fptr);
sav_errno = errno;
g_curr = ftell(e_fptr);
if (g_ptr == NULL) {
/* tried to parse a group string over MYBUFSIZ char */
if (sav_errno == ERANGE)
errmsg(M_GROUP_ENTRY_OVF);
else
errmsg(M_READ_ERROR);
modified = 0; /* bad group file: cannot rebuild */
break;
}
/* first delete the login from the group, if it's there */
if (overwrite || !gids) {
if (g_ptr->gr_mem != NULL) {
for (memptr = g_ptr->gr_mem; *memptr;
memptr++) {
if (strcmp(*memptr, login) == 0) {
/* Delete this one */
char **from = memptr + 1;
g_length -= (strlen(*memptr)+1);
do {
*(from - 1) = *from;
} while (*from++);
modified++;
break;
}
}
}
}
/* now check to see if group is one to add to */
if (gids) {
for (i = 0; gids[i] != -1; i++) {
if (g_ptr->gr_gid == gids[i]) {
/* Find end */
for (memptr = g_ptr->gr_mem; *memptr;
memptr++)
;
g_length += strlen(new_login ?
new_login : login)+1;
*memptr++ = new_login ?
new_login : login;
*memptr = NULL;
modified++;
}
}
}
putgrent(g_ptr, t_fptr);
}
free(g_string);
(void) fclose(e_fptr);
if (fclose(t_fptr) != 0) {
(void) unlink(t_name);
return (EX_UPDATE);
}
/* Now, update GROUP file, if it was modified */
if (modified) {
if (rename(t_name, GROUP) != 0) {
(void) unlink(t_name);
return (EX_UPDATE);
}
return (EX_SUCCESS);
} else {
(void) unlink(t_name);
return (EX_SUCCESS);
}
}
|
