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 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
181 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
182 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
183 inop->inode.iso_ctime = inop->inode.iso_atime;
184 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
185 inop->inode.iso_mtime = inop->inode.iso_ctime;
186 } else
187 ap = NULL;
188 }
189 if (!ap) {
190 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
191 inop->inode.iso_atime = inop->inode.iso_ctime;
192 inop->inode.iso_mtime = inop->inode.iso_ctime;
193 }
194 if (bp2)
195 brelse(bp2);
196 }
197
198 int
cd9660_tstamp_conv7(u_char * pi,struct timespec * pu,enum ISO_FTYPE ftype)199 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype)
200 {
201 int crtime, days;
202 int y, m, d, hour, minute, second, tz;
203
204 y = pi[0] + 1900;
205 m = pi[1];
206 d = pi[2];
207 hour = pi[3];
208 minute = pi[4];
209 second = pi[5];
210 if(ftype != ISO_FTYPE_HIGH_SIERRA)
211 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
212 else
213 /* original high sierra misses timezone data */
214 tz = 0;
215
216 if (y < 1970) {
217 pu->tv_sec = 0;
218 pu->tv_nsec = 0;
219 return 0;
220 } else {
221 #ifdef ORIGINAL
222 /* computes day number relative to Sept. 19th,1989 */
223 /* don't even *THINK* about changing formula. It works! */
224 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
225 #else
226 /*
227 * Changed :-) to make it relative to Jan. 1st, 1970
228 * and to disambiguate negative division
229 */
230 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
231 #endif
232 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
233
234 /* timezone offset is unreliable on some disks */
235 if (-48 <= tz && tz <= 52)
236 crtime -= tz * 15 * 60;
237 }
238 pu->tv_sec = crtime;
239 pu->tv_nsec = 0;
240 return 1;
241 }
242
243 static u_int
cd9660_chars2ui(u_char * begin,int len)244 cd9660_chars2ui(u_char *begin, int len)
245 {
246 u_int rc;
247
248 for (rc = 0; --len >= 0;) {
249 rc *= 10;
250 rc += *begin++ - '0';
251 }
252 return rc;
253 }
254
255 int
cd9660_tstamp_conv17(u_char * pi,struct timespec * pu)256 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
257 {
258 u_char buf[7];
259
260 /* year:"0001"-"9999" -> -1900 */
261 buf[0] = cd9660_chars2ui(pi,4) - 1900;
262
263 /* month: " 1"-"12" -> 1 - 12 */
264 buf[1] = cd9660_chars2ui(pi + 4,2);
265
266 /* day: " 1"-"31" -> 1 - 31 */
267 buf[2] = cd9660_chars2ui(pi + 6,2);
268
269 /* hour: " 0"-"23" -> 0 - 23 */
270 buf[3] = cd9660_chars2ui(pi + 8,2);
271
272 /* minute:" 0"-"59" -> 0 - 59 */
273 buf[4] = cd9660_chars2ui(pi + 10,2);
274
275 /* second:" 0"-"59" -> 0 - 59 */
276 buf[5] = cd9660_chars2ui(pi + 12,2);
277
278 /* difference of GMT */
279 buf[6] = pi[16];
280
281 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
282 }
283
284 cd_ino_t
isodirino(struct iso_directory_record * isodir,struct iso_mnt * imp)285 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
286 {
287 cd_ino_t ino;
288
289 /*
290 * Note there is an inverse calculation in
291 * cd9660_vfsops.c:cd9660_vget_internal():
292 * ip->iso_start = ino >> imp->im_bshift;
293 * and also a calculation of the isodir pointer
294 * from an inode in cd9660_vnops.c:cd9660_readlink()
295 */
296 ino = ((cd_ino_t)isonum_733(isodir->extent) +
297 isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
298 return ino;
299 }
300