1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1994, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley
8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
9 * Support code is derived from software contributed to Berkeley
10 * by Atsushi Murai (amurai@spec.co.jp).
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mount.h>
45 #include <sys/bio.h>
46 #include <sys/buf.h>
47 #include <sys/vnode.h>
48 #include <sys/malloc.h>
49 #include <sys/stat.h>
50 #include <sys/mutex.h>
51
52 #include <fs/cd9660/iso.h>
53 #include <fs/cd9660/cd9660_node.h>
54 #include <fs/cd9660/cd9660_mount.h>
55
56 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
57
58 /*
59 * Last reference to an inode, write the inode out and if necessary,
60 * truncate and deallocate the file.
61 */
62 int
63 cd9660_inactive(ap)
64 struct vop_inactive_args /* {
65 struct vnode *a_vp;
66 } */ *ap;
67 {
68 struct vnode *vp = ap->a_vp;
69 struct iso_node *ip = VTOI(vp);
70 int error = 0;
71
72 /*
73 * If we are done with the inode, reclaim it
74 * so that it can be reused immediately.
75 */
76 if (ip->inode.iso_mode == 0)
77 vrecycle(vp);
78 return error;
79 }
80
81 /*
82 * Reclaim an inode so that it can be used for other purposes.
83 */
84 int
85 cd9660_reclaim(ap)
86 struct vop_reclaim_args /* {
87 struct vnode *a_vp;
88 } */ *ap;
89 {
90 struct vnode *vp = ap->a_vp;
91
92 /*
93 * Remove the inode from its hash chain.
94 */
95 vfs_hash_remove(vp);
96
97 /*
98 * Purge old data structures associated with the inode.
99 */
100 free(vp->v_data, M_ISOFSNODE);
101 vp->v_data = NULL;
102 return (0);
103 }
104
105 /*
106 * File attributes
107 */
108 void
109 cd9660_defattr(isodir, inop, bp, ftype)
110 struct iso_directory_record *isodir;
111 struct iso_node *inop;
112 struct buf *bp;
113 enum ISO_FTYPE ftype;
114 {
115 struct buf *bp2 = NULL;
116 struct iso_mnt *imp;
117 struct iso_extended_attributes *ap = NULL;
118 int off;
119
120 /* high sierra does not have timezone data, flag is one byte ahead */
121 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
122 &isodir->date[6]: isodir->flags)&2) {
123 inop->inode.iso_mode = S_IFDIR;
124 /*
125 * If we return 2, fts() will assume there are no subdirectories
126 * (just links for the path and .), so instead we return 1.
127 */
128 inop->inode.iso_links = 1;
129 } else {
130 inop->inode.iso_mode = S_IFREG;
131 inop->inode.iso_links = 1;
132 }
133 if (!bp
134 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
135 && (off = isonum_711(isodir->ext_attr_length))) {
136 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
137 &bp2);
138 bp = bp2;
139 }
140 if (bp) {
141 ap = (struct iso_extended_attributes *)bp->b_data;
142
143 if (isonum_711(ap->version) == 1) {
144 if (!(ap->perm[0]&0x40))
145 inop->inode.iso_mode |= S_IXOTH;
146 if (!(ap->perm[0]&0x10))
147 inop->inode.iso_mode |= S_IROTH;
148 if (!(ap->perm[0]&4))
149 inop->inode.iso_mode |= S_IXGRP;
150 if (!(ap->perm[0]&1))
151 inop->inode.iso_mode |= S_IRGRP;
152 if (!(ap->perm[1]&0x40))
153 inop->inode.iso_mode |= S_IXUSR;
154 if (!(ap->perm[1]&0x10))
155 inop->inode.iso_mode |= S_IRUSR;
156 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
157 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
158 } else
159 ap = NULL;
160 }
161 if (!ap) {
162 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
163 inop->inode.iso_uid = (uid_t)0;
164 inop->inode.iso_gid = (gid_t)0;
165 }
166 if (bp2)
167 brelse(bp2);
168 }
169
170 /*
171 * Time stamps
172 */
173 void
174 cd9660_deftstamp(isodir,inop,bp,ftype)
175 struct iso_directory_record *isodir;
176 struct iso_node *inop;
177 struct buf *bp;
178 enum ISO_FTYPE ftype;
179 {
180 struct buf *bp2 = NULL;
181 struct iso_mnt *imp;
182 struct iso_extended_attributes *ap = NULL;
183 int off;
184
185 if (!bp
186 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
187 && (off = isonum_711(isodir->ext_attr_length))) {
188 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
189 &bp2);
190 bp = bp2;
191 }
192 if (bp) {
193 ap = (struct iso_extended_attributes *)bp->b_data;
194
195 if (ftype != ISO_FTYPE_HIGH_SIERRA
196 && isonum_711(ap->version) == 1) {
197 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
198 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
199 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
200 inop->inode.iso_ctime = inop->inode.iso_atime;
201 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
202 inop->inode.iso_mtime = inop->inode.iso_ctime;
203 } else
204 ap = NULL;
205 }
206 if (!ap) {
207 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
208 inop->inode.iso_atime = inop->inode.iso_ctime;
209 inop->inode.iso_mtime = inop->inode.iso_ctime;
210 }
211 if (bp2)
212 brelse(bp2);
213 }
214
215 int
216 cd9660_tstamp_conv7(pi,pu,ftype)
217 u_char *pi;
218 struct timespec *pu;
219 enum ISO_FTYPE ftype;
220 {
221 int crtime, days;
222 int y, m, d, hour, minute, second, tz;
223
224 y = pi[0] + 1900;
225 m = pi[1];
226 d = pi[2];
227 hour = pi[3];
228 minute = pi[4];
229 second = pi[5];
230 if(ftype != ISO_FTYPE_HIGH_SIERRA)
231 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
232 else
233 /* original high sierra misses timezone data */
234 tz = 0;
235
236 if (y < 1970) {
237 pu->tv_sec = 0;
238 pu->tv_nsec = 0;
239 return 0;
240 } else {
241 #ifdef ORIGINAL
242 /* computes day number relative to Sept. 19th,1989 */
243 /* don't even *THINK* about changing formula. It works! */
244 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
245 #else
246 /*
247 * Changed :-) to make it relative to Jan. 1st, 1970
248 * and to disambiguate negative division
249 */
250 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
251 #endif
252 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
253
254 /* timezone offset is unreliable on some disks */
255 if (-48 <= tz && tz <= 52)
256 crtime -= tz * 15 * 60;
257 }
258 pu->tv_sec = crtime;
259 pu->tv_nsec = 0;
260 return 1;
261 }
262
263 static u_int
264 cd9660_chars2ui(begin,len)
265 u_char *begin;
266 int len;
267 {
268 u_int rc;
269
270 for (rc = 0; --len >= 0;) {
271 rc *= 10;
272 rc += *begin++ - '';
273 }
274 return rc;
275 }
276
277 int
278 cd9660_tstamp_conv17(pi,pu)
279 u_char *pi;
280 struct timespec *pu;
281 {
282 u_char buf[7];
283
284 /* year:"0001"-"9999" -> -1900 */
285 buf[0] = cd9660_chars2ui(pi,4) - 1900;
286
287 /* month: " 1"-"12" -> 1 - 12 */
288 buf[1] = cd9660_chars2ui(pi + 4,2);
289
290 /* day: " 1"-"31" -> 1 - 31 */
291 buf[2] = cd9660_chars2ui(pi + 6,2);
292
293 /* hour: " 0"-"23" -> 0 - 23 */
294 buf[3] = cd9660_chars2ui(pi + 8,2);
295
296 /* minute:" 0"-"59" -> 0 - 59 */
297 buf[4] = cd9660_chars2ui(pi + 10,2);
298
299 /* second:" 0"-"59" -> 0 - 59 */
300 buf[5] = cd9660_chars2ui(pi + 12,2);
301
302 /* difference of GMT */
303 buf[6] = pi[16];
304
305 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
306 }
307
308 cd_ino_t
309 isodirino(isodir, imp)
310 struct iso_directory_record *isodir;
311 struct iso_mnt *imp;
312 {
313 cd_ino_t ino;
314
315 /*
316 * Note there is an inverse calculation in
317 * cd9660_vfsops.c:cd9660_vget_internal():
318 * ip->iso_start = ino >> imp->im_bshift;
319 * and also a calculation of the isodir pointer
320 * from an inode in cd9660_vnops.c:cd9660_readlink()
321 */
322 ino = ((cd_ino_t)isonum_733(isodir->extent) +
323 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
324 return ino;
325 }
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