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