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
56static 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 */
62int
63cd9660_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 */
84int
85cd9660_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 */
108void
109cd9660_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 */
173void
174cd9660_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
215int
216cd9660_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
263static u_int
264cd9660_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++ - '0';
273	}
274	return rc;
275}
276
277int
278cd9660_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
308cd_ino_t
309isodirino(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}
326