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 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 /*
36 * fsirand installs random inode generation numbers on all the inodes on
37 * device <special>, and also installs a file system ID in the superblock.
38 * This helps increase the security of file systems exported by NFS.
39 */
40
41 #include <fcntl.h>
42 #include <stdio.h>
43 #include <errno.h>
44 #include <strings.h>
45 #include <unistd.h>
46 #include <stdlib.h>
47 #include <sys/param.h>
48 #include <sys/types.h>
49 #include <sys/time.h>
50 #include <sys/fs/ufs_fs.h>
51 #include <sys/vnode.h>
52 #include <sys/fs/ufs_inode.h>
53
54 long fsbuf[(SBSIZE / sizeof (long))];
55 struct dinode dibuf[8192/sizeof (struct dinode)];
56
57 int
main(int argc,char * argv[])58 main(int argc, char *argv[])
59 {
60 struct fs *fs;
61 int fd;
62 char *dev;
63 int bno;
64 struct dinode *dip;
65 int inum, imax;
66 int i, n;
67 offset_t seekaddr;
68 int bsize;
69 int pflag = 0;
70 struct timeval timeval;
71
72 argv++;
73 argc--;
74 if (argc > 0 && strcmp(*argv, "-p") == 0) {
75 pflag++;
76 argv++;
77 argc--;
78 }
79 if (argc <= 0) {
80 (void) fprintf(stderr, "Usage: fsirand [-p] special\n");
81 exit(1);
82 }
83 dev = *argv;
84 fd = open64(dev, pflag ? O_RDONLY : O_RDWR);
85 if (fd == -1) {
86 (void) fprintf(stderr, "fsirand: Cannot open %s: %s\n", dev,
87 strerror(errno));
88 exit(1);
89 }
90 if (llseek(fd, (offset_t)SBLOCK * DEV_BSIZE, 0) == -1) {
91 (void) fprintf(stderr,
92 "fsirand: Seek to superblock failed: %s\n",
93 strerror(errno));
94 exit(1);
95 }
96 fs = (struct fs *)fsbuf;
97 if ((n = read(fd, (char *)fs, SBSIZE)) != SBSIZE) {
98 (void) fprintf(stderr,
99 "fsirand: Read of superblock failed: %s\n",
100 n == -1 ? strerror(errno) : "Short read");
101 exit(1);
102 }
103 if ((fs->fs_magic != FS_MAGIC) &&
104 (fs->fs_magic != MTB_UFS_MAGIC)) {
105 (void) fprintf(stderr,
106 "fsirand: Not a file system (bad magic number in superblock)\n");
107 exit(1);
108 }
109 if (fs->fs_magic == FS_MAGIC &&
110 (fs->fs_version != UFS_EFISTYLE4NONEFI_VERSION_2 &&
111 fs->fs_version != UFS_VERSION_MIN)) {
112 (void) fprintf(stderr,
113 "fsirand: Unrecognized UFS format version number %d (in superblock)\n",
114 fs->fs_version);
115 exit(1);
116 }
117 if (fs->fs_magic == MTB_UFS_MAGIC &&
118 (fs->fs_version > MTB_UFS_VERSION_1 ||
119 fs->fs_version < MTB_UFS_VERSION_MIN)) {
120 (void) fprintf(stderr,
121 "fsirand: Unrecognized UFS format version number %d (in superblock)\n",
122 fs->fs_version);
123 exit(1);
124 }
125 if (pflag) {
126 (void) printf("fsid: %x %x\n", fs->fs_id[0], fs->fs_id[1]);
127 } else {
128 n = getpid();
129 (void) gettimeofday(&timeval, (struct timezone *)NULL);
130 srand48((long)(timeval.tv_sec + timeval.tv_usec + n));
131 }
132 bsize = INOPB(fs) * sizeof (struct dinode);
133 inum = 0;
134 imax = fs->fs_ipg * fs->fs_ncg;
135 while (inum < imax) {
136 bno = itod(fs, inum);
137 seekaddr = (offset_t)fsbtodb(fs, bno) * DEV_BSIZE;
138 if (llseek(fd, seekaddr, 0) == -1) {
139 (void) fprintf(stderr,
140 "fsirand: Seek to %ld %ld failed: %s\n",
141 ((off_t *)&seekaddr)[0], ((off_t *)&seekaddr)[1],
142 strerror(errno));
143 exit(1);
144 }
145 n = read(fd, (char *)dibuf, bsize);
146 if (n != bsize) {
147 (void) fprintf(stderr,
148 "fsirand: Read of ilist block failed: %s\n",
149 n == -1 ? strerror(errno) : "Short read");
150 exit(1);
151 }
152 for (dip = dibuf; dip < &dibuf[INOPB(fs)]; dip++) {
153 if (pflag) {
154 (void) printf("ino %d gen %x\n", inum,
155 dip->di_gen);
156 } else {
157 dip->di_gen = lrand48();
158 }
159 inum++;
160 }
161 if (!pflag) {
162 if (llseek(fd, seekaddr, 0) == -1) {
163 (void) fprintf(stderr,
164 "fsirand: Seek to %ld %ld failed: %s\n",
165 ((off_t *)&seekaddr)[0],
166 ((off_t *)&seekaddr)[1],
167 strerror(errno));
168 exit(1);
169 }
170 n = write(fd, (char *)dibuf, bsize);
171 if (n != bsize) {
172 (void) fprintf(stderr,
173 "fsirand: Write of ilist block failed: %s\n",
174 n == -1 ? strerror(errno) : "Short write");
175 exit(1);
176 }
177 }
178 }
179 if (!pflag) {
180 (void) gettimeofday(&timeval, (struct timezone *)NULL);
181 fs->fs_id[0] = timeval.tv_sec;
182 fs->fs_id[1] = timeval.tv_usec + getpid();
183 if (llseek(fd, (offset_t)SBLOCK * DEV_BSIZE, 0) == -1) {
184 (void) fprintf(stderr,
185 "fsirand: Seek to superblock failed: %s\n",
186 strerror(errno));
187 exit(1);
188 }
189 if ((n = write(fd, (char *)fs, SBSIZE)) != SBSIZE) {
190 (void) fprintf(stderr,
191 "fsirand: Write of superblock failed: %s\n",
192 n == -1 ? strerror(errno) : "Short write");
193 exit(1);
194 }
195 }
196 for (i = 0; i < fs->fs_ncg; i++) {
197 seekaddr = (offset_t)fsbtodb(fs, cgsblock(fs, i)) * DEV_BSIZE;
198 if (llseek(fd, seekaddr, 0) == -1) {
199 (void) fprintf(stderr,
200 "fsirand: Seek to alternate superblock failed: %s\n",
201 strerror(errno));
202 exit(1);
203 }
204 if (pflag) {
205 if ((n = read(fd, (char *)fs, SBSIZE)) != SBSIZE) {
206 (void) fprintf(stderr,
207 "fsirand: Read of alternate superblock failed: %s\n",
208 n == -1 ? strerror(errno) : "Short read");
209 exit(1);
210 }
211 if ((fs->fs_magic != FS_MAGIC) &&
212 (fs->fs_magic != MTB_UFS_MAGIC)) {
213 (void) fprintf(stderr,
214 "fsirand: Not a valid file system (bad "
215 "magic number in alternate superblock)\n");
216 exit(1);
217 }
218 } else {
219 if ((n = write(fd, (char *)fs, SBSIZE)) != SBSIZE) {
220 (void) fprintf(stderr,
221 "fsirand: Write of alternate superblock failed: %s\n",
222 n == -1 ? strerror(errno) : "Short write");
223 exit(1);
224 }
225 }
226 }
227 return (0);
228 }
229