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
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mount.h>
40 #include <sys/bio.h>
41 #include <sys/buf.h>
42 #include <sys/vnode.h>
43 #include <sys/malloc.h>
44 #include <sys/stat.h>
45 #include <sys/mutex.h>
46
47 #include <fs/cd9660/iso.h>
48 #include <fs/cd9660/cd9660_node.h>
49 #include <fs/cd9660/cd9660_mount.h>
50
51 static unsigned cd9660_chars2ui(unsigned char *begin, int len);
52
53 /*
54 * Last reference to an inode, write the inode out and if necessary,
55 * truncate and deallocate the file.
56 */
57 int
cd9660_inactive(struct vop_inactive_args * ap)58 cd9660_inactive(struct vop_inactive_args *ap)
59 {
60 struct vnode *vp = ap->a_vp;
61 struct iso_node *ip = VTOI(vp);
62 int error = 0;
63
64 /*
65 * If we are done with the inode, reclaim it
66 * so that it can be reused immediately.
67 */
68 if (ip->inode.iso_mode == 0)
69 vrecycle(vp);
70 return error;
71 }
72
73 /*
74 * Reclaim an inode so that it can be used for other purposes.
75 */
76 int
cd9660_reclaim(struct vop_reclaim_args * ap)77 cd9660_reclaim(struct vop_reclaim_args *ap)
78 {
79 struct vnode *vp = ap->a_vp;
80
81 /*
82 * Remove the inode from its hash chain.
83 */
84 vfs_hash_remove(vp);
85
86 /*
87 * Purge old data structures associated with the inode.
88 */
89 free(vp->v_data, M_ISOFSNODE);
90 vp->v_data = NULL;
91 return (0);
92 }
93
94 /*
95 * File attributes
96 */
97 void
cd9660_defattr(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp,enum ISO_FTYPE ftype)98 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
99 struct buf *bp, enum ISO_FTYPE ftype)
100 {
101 struct buf *bp2 = NULL;
102 struct iso_mnt *imp;
103 struct iso_extended_attributes *ap = NULL;
104 int off;
105
106 /* high sierra does not have timezone data, flag is one byte ahead */
107 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
108 &isodir->date[6]: isodir->flags)&2) {
109 inop->inode.iso_mode = S_IFDIR;
110 /*
111 * If we return 2, fts() will assume there are no subdirectories
112 * (just links for the path and .), so instead we return 1.
113 */
114 inop->inode.iso_links = 1;
115 } else {
116 inop->inode.iso_mode = S_IFREG;
117 inop->inode.iso_links = 1;
118 }
119 if (!bp
120 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
121 && (off = isonum_711(isodir->ext_attr_length))) {
122 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
123 &bp2);
124 bp = bp2;
125 }
126 if (bp) {
127 ap = (struct iso_extended_attributes *)bp->b_data;
128
129 if (isonum_711(ap->version) == 1) {
130 if (!(ap->perm[0]&0x40))
131 inop->inode.iso_mode |= S_IXOTH;
132 if (!(ap->perm[0]&0x10))
133 inop->inode.iso_mode |= S_IROTH;
134 if (!(ap->perm[0]&4))
135 inop->inode.iso_mode |= S_IXGRP;
136 if (!(ap->perm[0]&1))
137 inop->inode.iso_mode |= S_IRGRP;
138 if (!(ap->perm[1]&0x40))
139 inop->inode.iso_mode |= S_IXUSR;
140 if (!(ap->perm[1]&0x10))
141 inop->inode.iso_mode |= S_IRUSR;
142 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
143 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
144 } else
145 ap = NULL;
146 }
147 if (!ap) {
148 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
149 inop->inode.iso_uid = (uid_t)0;
150 inop->inode.iso_gid = (gid_t)0;
151 }
152 if (bp2)
153 brelse(bp2);
154 }
155
156 /*
157 * Time stamps
158 */
159 void
cd9660_deftstamp(struct iso_directory_record * isodir,struct iso_node * inop,struct buf * bp,enum ISO_FTYPE ftype)160 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
161 struct buf *bp, enum ISO_FTYPE ftype)
162 {
163 struct buf *bp2 = NULL;
164 struct iso_mnt *imp;
165 struct iso_extended_attributes *ap = NULL;
166 int off;
167
168 if (!bp
169 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
170 && (off = isonum_711(isodir->ext_attr_length))) {
171 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
172 &bp2);
173 bp = bp2;
174 }
175 if (bp) {
176 ap = (struct iso_extended_attributes *)bp->b_data;
177
178 if (ftype != ISO_FTYPE_HIGH_SIERRA
179 && isonum_711(ap->version) == 1) {
180 /*
181 * The extended attributes include create
182 * (ctime), modify (mtime), expiration
183 * (xtime), and effective (ftime) timstamps.
184 * Only the first two are meaningful for struct
185 * stat.
186 */
187 if (!cd9660_tstamp_conv17(ap->ctime,
188 &inop->inode.iso_birthtime))
189 memset(&inop->inode.iso_birthtime, 0,
190 sizeof(inop->inode.iso_birthtime));
191 if (!cd9660_tstamp_conv17(ap->mtime,
192 &inop->inode.iso_mtime))
193 inop->inode.iso_mtime =
194 inop->inode.iso_birthtime;
195 inop->inode.iso_ctime = inop->inode.iso_mtime;
196 inop->inode.iso_atime = inop->inode.iso_mtime;
197 } else
198 ap = NULL;
199 }
200 if (!ap) {
201 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
202 inop->inode.iso_atime = inop->inode.iso_ctime;
203 inop->inode.iso_mtime = inop->inode.iso_ctime;
204 inop->inode.iso_birthtime = inop->inode.iso_ctime;
205 }
206 if (bp2)
207 brelse(bp2);
208 }
209
210 int
cd9660_tstamp_conv7(u_char * pi,struct timespec * pu,enum ISO_FTYPE ftype)211 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
212 {
213 int crtime, days;
214 int y, m, d, hour, minute, second, tz;
215
216 y = pi[0] + 1900;
217 m = pi[1];
218 d = pi[2];
219 hour = pi[3];
220 minute = pi[4];
221 second = pi[5];
222 if(ftype != ISO_FTYPE_HIGH_SIERRA)
223 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
224 else
225 /* original high sierra misses timezone data */
226 tz = 0;
227
228 if (y < 1970) {
229 pu->tv_sec = 0;
230 pu->tv_nsec = 0;
231 return 0;
232 } else {
233 #ifdef ORIGINAL
234 /* computes day number relative to Sept. 19th,1989 */
235 /* don't even *THINK* about changing formula. It works! */
236 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
237 #else
238 /*
239 * Changed :-) to make it relative to Jan. 1st, 1970
240 * and to disambiguate negative division
241 */
242 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
243 #endif
244 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
245
246 /* timezone offset is unreliable on some disks */
247 if (-48 <= tz && tz <= 52)
248 crtime -= tz * 15 * 60;
249 }
250 pu->tv_sec = crtime;
251 pu->tv_nsec = 0;
252 return 1;
253 }
254
255 static u_int
cd9660_chars2ui(u_char * begin,int len)256 cd9660_chars2ui(u_char *begin, int len)
257 {
258 u_int rc;
259
260 for (rc = 0; --len >= 0;) {
261 rc *= 10;
262 rc += *begin++ - '0';
263 }
264 return rc;
265 }
266
267 int
cd9660_tstamp_conv17(u_char * pi,struct timespec * pu)268 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
269 {
270 u_char buf[7];
271
272 /* year:"0001"-"9999" -> -1900 */
273 buf[0] = cd9660_chars2ui(pi,4) - 1900;
274
275 /* month: " 1"-"12" -> 1 - 12 */
276 buf[1] = cd9660_chars2ui(pi + 4,2);
277
278 /* day: " 1"-"31" -> 1 - 31 */
279 buf[2] = cd9660_chars2ui(pi + 6,2);
280
281 /* hour: " 0"-"23" -> 0 - 23 */
282 buf[3] = cd9660_chars2ui(pi + 8,2);
283
284 /* minute:" 0"-"59" -> 0 - 59 */
285 buf[4] = cd9660_chars2ui(pi + 10,2);
286
287 /* second:" 0"-"59" -> 0 - 59 */
288 buf[5] = cd9660_chars2ui(pi + 12,2);
289
290 /* difference of GMT */
291 buf[6] = pi[16];
292
293 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
294 }
295
296 ino_t
isodirino(struct iso_directory_record * isodir,struct iso_mnt * imp)297 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
298 {
299 ino_t ino;
300
301 /*
302 * Note there is an inverse calculation in
303 * cd9660_vfsops.c:cd9660_vget_internal():
304 * ip->iso_start = ino >> imp->im_bshift;
305 * and also a calculation of the isodir pointer
306 * from an inode in cd9660_vnops.c:cd9660_readlink()
307 */
308 ino = ((ino_t)isonum_733(isodir->extent) +
309 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
310 return ino;
311 }
312