1/*	$OpenBSD: cd9660_node.c,v 1.38 2021/10/19 06:11:45 semarie Exp $	*/
2/*	$NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $	*/
3
4/*-
5 * Copyright (c) 1982, 1986, 1989, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley
9 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
10 * Support code is derived from software contributed to Berkeley
11 * by Atsushi Murai (amurai@spec.co.jp).
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)cd9660_node.c	8.5 (Berkeley) 12/5/94
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/mount.h>
43#include <sys/buf.h>
44#include <sys/vnode.h>
45#include <sys/lock.h>
46#include <sys/namei.h>
47#include <sys/kernel.h>
48#include <sys/malloc.h>
49#include <sys/stat.h>
50
51#include <crypto/siphash.h>
52
53#include <isofs/cd9660/iso.h>
54#include <isofs/cd9660/cd9660_extern.h>
55#include <isofs/cd9660/cd9660_node.h>
56
57/*
58 * Structures associated with iso_node caching.
59 */
60u_int cd9660_isohash(dev_t, cdino_t);
61
62struct iso_node **isohashtbl;
63u_long isohash;
64SIPHASH_KEY isohashkey;
65#define	INOHASH(device, inum) cd9660_isohash((device), (inum))
66
67extern int prtactive;	/* 1 => print out reclaim of active vnodes */
68
69static u_int cd9660_chars2ui(u_char *, int);
70
71/*
72 * Initialize hash links for inodes and dnodes.
73 */
74int
75cd9660_init(struct vfsconf *vfsp)
76{
77
78	isohashtbl = hashinit(initialvnodes, M_ISOFSMNT, M_WAITOK, &isohash);
79	arc4random_buf(&isohashkey, sizeof(isohashkey));
80	return (0);
81}
82
83u_int
84cd9660_isohash(dev_t device, cdino_t inum)
85{
86	SIPHASH_CTX ctx;
87
88	SipHash24_Init(&ctx, &isohashkey);
89	SipHash24_Update(&ctx, &device, sizeof(device));
90	SipHash24_Update(&ctx, &inum, sizeof(inum));
91	return (SipHash24_End(&ctx) & isohash);
92}
93
94/*
95 * Use the device/inum pair to find the incore inode, and return a pointer
96 * to it. If it is in core, but locked, wait for it.
97 */
98struct vnode *
99cd9660_ihashget(dev_t dev, cdino_t inum)
100{
101	struct iso_node *ip;
102	struct vnode *vp;
103
104loop:
105	/* XXX locking lock hash list? */
106       for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
107               if (inum == ip->i_number && dev == ip->i_dev) {
108                       vp = ITOV(ip);
109			/* XXX locking unlock hash list? */
110                       if (vget(vp, LK_EXCLUSIVE))
111                               goto loop;
112                       return (vp);
113	       }
114       }
115	/* XXX locking unlock hash list? */
116       return (NULL);
117}
118
119/*
120 * Insert the inode into the hash table, and return it locked.
121 */
122int
123cd9660_ihashins(struct iso_node *ip)
124{
125	struct iso_node **ipp, *iq;
126
127	/* XXX locking lock hash list? */
128	ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
129
130	for (iq = *ipp; iq; iq = iq->i_next) {
131		if (iq->i_dev == ip->i_dev &&
132		    iq->i_number == ip->i_number)
133			return (EEXIST);
134	}
135
136	if ((iq = *ipp) != NULL)
137		iq->i_prev = &ip->i_next;
138	ip->i_next = iq;
139	ip->i_prev = ipp;
140	*ipp = ip;
141	/* XXX locking unlock hash list? */
142
143	VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
144
145	return (0);
146}
147
148/*
149 * Remove the inode from the hash table.
150 */
151void
152cd9660_ihashrem(struct iso_node *ip)
153{
154	struct iso_node *iq;
155
156	if (ip->i_prev == NULL)
157		return;
158
159	/* XXX locking lock hash list? */
160	if ((iq = ip->i_next) != NULL)
161		iq->i_prev = ip->i_prev;
162	*ip->i_prev = iq;
163#ifdef DIAGNOSTIC
164	ip->i_next = NULL;
165	ip->i_prev = NULL;
166#endif
167	/* XXX locking unlock hash list? */
168}
169
170/*
171 * Last reference to an inode, write the inode out and if necessary,
172 * truncate and deallocate the file.
173 */
174int
175cd9660_inactive(void *v)
176{
177	struct vop_inactive_args *ap = v;
178	struct vnode *vp = ap->a_vp;
179	struct iso_node *ip = VTOI(vp);
180	int error = 0;
181
182#ifdef DIAGNOSTIC
183	if (prtactive && vp->v_usecount != 0)
184		vprint("cd9660_inactive: pushing active", vp);
185#endif
186
187	ip->i_flag = 0;
188	VOP_UNLOCK(vp);
189	/*
190	 * If we are done with the inode, reclaim it
191	 * so that it can be reused immediately.
192	 */
193	if (ip->inode.iso_mode == 0)
194		vrecycle(vp, ap->a_p);
195
196	return (error);
197}
198
199/*
200 * Reclaim an inode so that it can be used for other purposes.
201 */
202int
203cd9660_reclaim(void *v)
204{
205	struct vop_reclaim_args *ap = v;
206	struct vnode *vp = ap->a_vp;
207	struct iso_node *ip = VTOI(vp);
208
209#ifdef DIAGNOSTIC
210	if (prtactive && vp->v_usecount != 0)
211		vprint("cd9660_reclaim: pushing active", vp);
212#endif
213
214	/*
215	 * Remove the inode from its hash chain.
216	 */
217	cd9660_ihashrem(ip);
218	/*
219	 * Purge old data structures associated with the inode.
220	 */
221	cache_purge(vp);
222	if (ip->i_devvp) {
223		vrele(ip->i_devvp);
224		ip->i_devvp = 0;
225	}
226	free(vp->v_data, M_ISOFSNODE, 0);
227	vp->v_data = NULL;
228	return (0);
229}
230
231/*
232 * File attributes
233 */
234void
235cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop,
236    struct buf *bp)
237{
238	struct buf *bp2 = NULL;
239	struct iso_mnt *imp;
240	struct iso_extended_attributes *ap = NULL;
241	int off;
242
243	if (isonum_711(isodir->flags)&2) {
244		inop->inode.iso_mode = S_IFDIR;
245		/*
246		 * If we return 2, fts() will assume there are no subdirectories
247		 * (just links for the path and .), so instead we return 1.
248		 */
249		inop->inode.iso_links = 1;
250	} else {
251		inop->inode.iso_mode = S_IFREG;
252		inop->inode.iso_links = 1;
253	}
254	if (!bp
255	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
256	    && (off = isonum_711(isodir->ext_attr_length))) {
257		cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
258			     &bp2);
259		bp = bp2;
260	}
261	if (bp) {
262		ap = (struct iso_extended_attributes *)bp->b_data;
263
264		if (isonum_711(ap->version) == 1) {
265			if (!(ap->perm[1]&0x10))
266				inop->inode.iso_mode |= S_IRUSR;
267			if (!(ap->perm[1]&0x40))
268				inop->inode.iso_mode |= S_IXUSR;
269			if (!(ap->perm[0]&0x01))
270				inop->inode.iso_mode |= S_IRGRP;
271			if (!(ap->perm[0]&0x04))
272				inop->inode.iso_mode |= S_IXGRP;
273			if (!(ap->perm[0]&0x10))
274				inop->inode.iso_mode |= S_IROTH;
275			if (!(ap->perm[0]&0x40))
276				inop->inode.iso_mode |= S_IXOTH;
277			inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
278			inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
279		} else
280			ap = NULL;
281	}
282	if (!ap) {
283		inop->inode.iso_mode |=
284		    S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
285		inop->inode.iso_uid = (uid_t)0;
286		inop->inode.iso_gid = (gid_t)0;
287	}
288	if (bp2)
289		brelse(bp2);
290}
291
292/*
293 * Time stamps
294 */
295void
296cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop,
297    struct buf *bp)
298{
299	struct buf *bp2 = NULL;
300	struct iso_mnt *imp;
301	struct iso_extended_attributes *ap = NULL;
302	int off;
303
304	if (!bp
305	    && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
306	    && (off = isonum_711(isodir->ext_attr_length))) {
307		cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL,
308			     &bp2);
309		bp = bp2;
310	}
311	if (bp) {
312		ap = (struct iso_extended_attributes *)bp->b_data;
313
314		if (isonum_711(ap->version) == 1) {
315			if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
316				cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
317			if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
318				inop->inode.iso_ctime = inop->inode.iso_atime;
319			if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
320				inop->inode.iso_mtime = inop->inode.iso_ctime;
321		} else
322			ap = NULL;
323	}
324	if (!ap) {
325		cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
326		inop->inode.iso_atime = inop->inode.iso_ctime;
327		inop->inode.iso_mtime = inop->inode.iso_ctime;
328	}
329	if (bp2)
330		brelse(bp2);
331}
332
333int
334cd9660_tstamp_conv7(u_char *pi, struct timespec *pu)
335{
336	int crtime, days;
337	int y, m, d, hour, minute, second;
338	signed char tz;
339
340	y = pi[0] + 1900;
341	m = pi[1];
342	d = pi[2];
343	hour = pi[3];
344	minute = pi[4];
345	second = pi[5];
346	tz = (signed char) pi[6];
347
348	if (y < 1970) {
349		pu->tv_sec  = 0;
350		pu->tv_nsec = 0;
351		return (0);
352	} else {
353#ifdef	ORIGINAL
354		/* computes day number relative to Sept. 19th,1989 */
355		/* don't even *THINK* about changing formula. It works! */
356		days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
357#else
358		/*
359		 * Changed :-) to make it relative to Jan. 1st, 1970
360		 * and to disambiguate negative division
361		 */
362		days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
363#endif
364		crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
365
366		/* timezone offset is unreliable on some disks */
367		if (-48 <= tz && tz <= 52)
368			crtime -= tz * 15 * 60;
369	}
370	pu->tv_sec  = crtime;
371	pu->tv_nsec = 0;
372	return (1);
373}
374
375static u_int
376cd9660_chars2ui(u_char *begin, int len)
377{
378	u_int rc;
379
380	for (rc = 0; --len >= 0;) {
381		rc *= 10;
382		rc += *begin++ - '0';
383	}
384	return (rc);
385}
386
387int
388cd9660_tstamp_conv17(u_char *pi, struct timespec *pu)
389{
390	u_char buf[7];
391
392	/* year:"0001"-"9999" -> -1900  */
393	buf[0] = cd9660_chars2ui(pi,4) - 1900;
394
395	/* month: " 1"-"12"      -> 1 - 12 */
396	buf[1] = cd9660_chars2ui(pi + 4,2);
397
398	/* day:   " 1"-"31"      -> 1 - 31 */
399	buf[2] = cd9660_chars2ui(pi + 6,2);
400
401	/* hour:  " 0"-"23"      -> 0 - 23 */
402	buf[3] = cd9660_chars2ui(pi + 8,2);
403
404	/* minute:" 0"-"59"      -> 0 - 59 */
405	buf[4] = cd9660_chars2ui(pi + 10,2);
406
407	/* second:" 0"-"59"      -> 0 - 59 */
408	buf[5] = cd9660_chars2ui(pi + 12,2);
409
410	/* difference of GMT */
411	buf[6] = pi[16];
412
413	return (cd9660_tstamp_conv7(buf,pu));
414}
415
416cdino_t
417isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp)
418{
419	cdino_t ino;
420
421	ino = (isonum_733(isodir->extent) +
422	    isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
423	return (ino);
424}
425