- Use the SUSP parser to detect Rock Ridge (RRIP) extensions and to look up alternate names when opening files.
563 lines
14 KiB
C
563 lines
14 KiB
C
/* $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp $ */
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/*
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* Copyright (C) 1996 Wolfgang Solfrank.
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* Copyright (C) 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Stand-alone ISO9660 file reading package.
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*
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* Note: This doesn't support Rock Ridge extensions, extended attributes,
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* blocksizes other than 2048 bytes, multi-extent files, etc.
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*/
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#include <sys/param.h>
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#include <string.h>
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#include <sys/dirent.h>
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#include <isofs/cd9660/iso.h>
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#include <isofs/cd9660/cd9660_rrip.h>
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#include "stand.h"
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#define SUSP_CONTINUATION "CE"
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#define SUSP_PRESENT "SP"
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#define SUSP_STOP "ST"
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#define SUSP_EXTREF "ER"
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#define RRIP_NAME "NM"
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typedef struct {
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ISO_SUSP_HEADER h;
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u_char signature [ISODCL ( 5, 6)];
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u_char len_skp [ISODCL ( 7, 7)]; /* 711 */
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} ISO_SUSP_PRESENT;
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static int buf_read_file(struct open_file *f, char **buf_p,
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size_t *size_p);
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static int cd9660_open(const char *path, struct open_file *f);
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static int cd9660_close(struct open_file *f);
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static int cd9660_read(struct open_file *f, void *buf, size_t size,
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size_t *resid);
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static int cd9660_write(struct open_file *f, void *buf, size_t size,
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size_t *resid);
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static off_t cd9660_seek(struct open_file *f, off_t offset, int where);
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static int cd9660_stat(struct open_file *f, struct stat *sb);
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static int cd9660_readdir(struct open_file *f, struct dirent *d);
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static int dirmatch(struct open_file *f, const char *path,
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struct iso_directory_record *dp, int use_rrip, int lenskip);
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static int rrip_check(struct open_file *f, struct iso_directory_record *dp,
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int *lenskip);
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static char *rrip_lookup_name(struct open_file *f,
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struct iso_directory_record *dp, int lenskip, size_t *len);
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static ISO_SUSP_HEADER *susp_lookup_record(struct open_file *f,
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const char *identifier, struct iso_directory_record *dp,
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int lenskip);
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struct fs_ops cd9660_fsops = {
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"cd9660",
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cd9660_open,
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cd9660_close,
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cd9660_read,
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cd9660_write,
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cd9660_seek,
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cd9660_stat,
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cd9660_readdir
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};
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struct file {
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int f_isdir; /* nonzero if file is directory */
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off_t f_off; /* Current offset within file */
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daddr_t f_bno; /* Starting block number */
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off_t f_size; /* Size of file */
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daddr_t f_buf_blkno; /* block number of data block */
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char *f_buf; /* buffer for data block */
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};
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struct ptable_ent {
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char namlen [ISODCL( 1, 1)]; /* 711 */
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char extlen [ISODCL( 2, 2)]; /* 711 */
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char block [ISODCL( 3, 6)]; /* 732 */
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char parent [ISODCL( 7, 8)]; /* 722 */
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char name [1];
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};
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#define PTFIXSZ 8
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#define PTSIZE(pp) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)
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#define cdb2devb(bno) ((bno) * ISO_DEFAULT_BLOCK_SIZE / DEV_BSIZE)
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/* XXX these should be in the system headers */
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static __inline int
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isonum_722(p)
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u_char *p;
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{
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return (*p << 8)|p[1];
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}
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static __inline int
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isonum_732(p)
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u_char *p;
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{
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return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
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}
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static ISO_SUSP_HEADER *
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susp_lookup_record(struct open_file *f, const char *identifier,
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struct iso_directory_record *dp, int lenskip)
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{
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static char susp_buffer[ISO_DEFAULT_BLOCK_SIZE];
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ISO_SUSP_HEADER *sh;
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ISO_RRIP_CONT *shc;
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char *p, *end;
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int error;
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size_t read;
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p = dp->name + isonum_711(dp->name_len) + lenskip;
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/* Names of even length have a padding byte after the name. */
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if ((isonum_711(dp->name_len) & 1) == 0)
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p++;
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end = (char *)dp + isonum_711(dp->length);
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while (p + 3 < end) {
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sh = (ISO_SUSP_HEADER *)p;
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if (bcmp(sh->type, identifier, 2) == 0)
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return (sh);
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if (bcmp(sh->type, SUSP_STOP, 2) == 0)
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return (NULL);
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if (bcmp(sh->type, SUSP_CONTINUATION, 2) == 0) {
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shc = (ISO_RRIP_CONT *)sh;
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error = f->f_dev->dv_strategy(f->f_devdata, F_READ,
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cdb2devb(isonum_733(shc->location)),
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ISO_DEFAULT_BLOCK_SIZE, susp_buffer, &read);
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/* Bail if it fails. */
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if (error != 0 || read != ISO_DEFAULT_BLOCK_SIZE)
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return (NULL);
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p = susp_buffer + isonum_733(shc->offset);
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end = p + isonum_733(shc->length);
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} else
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/* Ignore this record and skip to the next. */
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p += isonum_711(sh->length);
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}
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return (NULL);
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}
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static char *
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rrip_lookup_name(struct open_file *f, struct iso_directory_record *dp,
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int lenskip, size_t *len)
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{
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ISO_RRIP_ALTNAME *p;
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if (len == NULL)
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return (NULL);
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p = (ISO_RRIP_ALTNAME *)susp_lookup_record(f, RRIP_NAME, dp, lenskip);
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if (p == NULL)
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return (NULL);
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switch (*p->flags) {
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case ISO_SUSP_CFLAG_CURRENT:
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*len = 1;
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return (".");
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case ISO_SUSP_CFLAG_PARENT:
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*len = 2;
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return ("..");
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case 0:
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*len = isonum_711(p->h.length) - 5;
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return ((char *)p + 5);
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default:
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/*
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* We don't handle hostnames or continued names as they are
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* too hard, so just bail and use the default name.
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*/
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return (NULL);
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}
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}
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static int
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rrip_check(struct open_file *f, struct iso_directory_record *dp, int *lenskip)
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{
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ISO_SUSP_PRESENT *sp;
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ISO_RRIP_EXTREF *er;
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char *p;
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/* First, see if we can find a SP field. */
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p = dp->name + isonum_711(dp->name_len);
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if (p > (char *)dp + isonum_711(dp->length))
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return (0);
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sp = (ISO_SUSP_PRESENT *)p;
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if (bcmp(sp->h.type, SUSP_PRESENT, 2) != 0)
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return (0);
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if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT))
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return (0);
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if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef)
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return (0);
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*lenskip = isonum_711(sp->len_skp);
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/*
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* Now look for an ER field. If RRIP is present, then there must
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* be at least one of these. It would be more pedantic to walk
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* through the list of fields looking for a Rock Ridge ER field.
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*/
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er = (ISO_RRIP_EXTREF *)susp_lookup_record(f, SUSP_EXTREF, dp, 0);
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if (er == NULL)
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return (0);
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return (1);
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}
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static int
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dirmatch(struct open_file *f, const char *path, struct iso_directory_record *dp,
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int use_rrip, int lenskip)
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{
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size_t len;
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char *cp;
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int i, icase;
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if (use_rrip)
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cp = rrip_lookup_name(f, dp, lenskip, &len);
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else
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cp = NULL;
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if (cp == NULL) {
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len = isonum_711(dp->name_len);
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cp = dp->name;
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icase = 1;
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} else
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icase = 0;
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for (i = len; --i >= 0; path++, cp++) {
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if (!*path || *path == '/')
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break;
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if (*path == *cp)
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continue;
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if (!icase && toupper(*path) == *cp)
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continue;
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return 0;
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}
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if (*path && *path != '/')
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return 0;
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/*
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* Allow stripping of trailing dots and the version number.
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* Note that this will find the first instead of the last version
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* of a file.
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*/
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if (i >= 0 && (*cp == ';' || *cp == '.')) {
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/* This is to prevent matching of numeric extensions */
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if (*cp == '.' && cp[1] != ';')
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return 0;
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while (--i >= 0)
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if (*++cp != ';' && (*cp < '0' || *cp > '9'))
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return 0;
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}
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return 1;
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}
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static int
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cd9660_open(const char *path, struct open_file *f)
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{
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struct file *fp = 0;
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void *buf;
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struct iso_primary_descriptor *vd;
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size_t buf_size, read, dsize, off;
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daddr_t bno, boff;
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struct iso_directory_record rec;
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struct iso_directory_record *dp = 0;
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int rc, first, use_rrip, lenskip;
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/* First find the volume descriptor */
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buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
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vd = buf;
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for (bno = 16;; bno++) {
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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
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ISO_DEFAULT_BLOCK_SIZE, buf, &read);
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if (rc)
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goto out;
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if (read != ISO_DEFAULT_BLOCK_SIZE) {
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rc = EIO;
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goto out;
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}
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rc = EINVAL;
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if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
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goto out;
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if (isonum_711(vd->type) == ISO_VD_END)
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goto out;
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if (isonum_711(vd->type) == ISO_VD_PRIMARY)
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break;
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}
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if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE)
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goto out;
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rec = *(struct iso_directory_record *) vd->root_directory_record;
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if (*path == '/') path++; /* eat leading '/' */
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first = 1;
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use_rrip = 0;
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while (*path) {
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bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
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dsize = isonum_733(rec.size);
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off = 0;
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boff = 0;
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while (off < dsize) {
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if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
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twiddle();
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rc = f->f_dev->dv_strategy
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(f->f_devdata, F_READ,
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cdb2devb(bno + boff),
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ISO_DEFAULT_BLOCK_SIZE,
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buf, &read);
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if (rc)
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goto out;
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if (read != ISO_DEFAULT_BLOCK_SIZE) {
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rc = EIO;
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goto out;
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}
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boff++;
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dp = (struct iso_directory_record *) buf;
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}
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if (isonum_711(dp->length) == 0) {
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/* skip to next block, if any */
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off = boff * ISO_DEFAULT_BLOCK_SIZE;
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continue;
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}
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/* See if RRIP is in use. */
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if (first)
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use_rrip = rrip_check(f, dp, &lenskip);
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if (dirmatch(f, path, dp, use_rrip,
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first ? 0 : lenskip)) {
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first = 0;
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break;
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} else
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first = 0;
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dp = (struct iso_directory_record *)
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((char *) dp + isonum_711(dp->length));
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off += isonum_711(dp->length);
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}
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if (off >= dsize) {
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rc = ENOENT;
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goto out;
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}
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rec = *dp;
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while (*path && *path != '/') /* look for next component */
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path++;
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if (*path) path++; /* skip '/' */
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}
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/* allocate file system specific data structure */
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fp = malloc(sizeof(struct file));
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bzero(fp, sizeof(struct file));
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f->f_fsdata = (void *)fp;
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fp->f_isdir = (isonum_711(rec.flags) & 2) != 0;
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fp->f_off = 0;
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fp->f_bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
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fp->f_size = isonum_733(rec.size);
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free(buf);
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return 0;
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out:
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if (fp)
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free(fp);
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free(buf);
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return rc;
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}
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static int
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cd9660_close(struct open_file *f)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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f->f_fsdata = 0;
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free(fp);
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return 0;
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}
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static int
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buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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daddr_t blkno, blkoff;
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int rc = 0;
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size_t read;
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blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE + fp->f_bno;
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blkoff = fp->f_off % ISO_DEFAULT_BLOCK_SIZE;
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if (blkno != fp->f_buf_blkno) {
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if (fp->f_buf == (char *)0)
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fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
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twiddle();
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rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
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cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);
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if (rc)
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return (rc);
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if (read != ISO_DEFAULT_BLOCK_SIZE)
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return (EIO);
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fp->f_buf_blkno = blkno;
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}
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*buf_p = fp->f_buf + blkoff;
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*size_p = ISO_DEFAULT_BLOCK_SIZE - blkoff;
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if (*size_p > fp->f_size - fp->f_off)
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*size_p = fp->f_size - fp->f_off;
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return (rc);
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}
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static int
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cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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char *buf, *addr;
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size_t buf_size, csize;
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int rc = 0;
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addr = start;
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while (size) {
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if (fp->f_off < 0 || fp->f_off >= fp->f_size)
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break;
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rc = buf_read_file(f, &buf, &buf_size);
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if (rc)
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break;
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csize = size > buf_size ? buf_size : size;
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bcopy(buf, addr, csize);
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fp->f_off += csize;
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addr += csize;
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size -= csize;
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}
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if (resid)
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*resid = size;
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return (rc);
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}
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static int
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cd9660_readdir(struct open_file *f, struct dirent *d)
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{
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struct file *fp = (struct file *)f->f_fsdata;
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struct iso_directory_record *ep;
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size_t buf_size, reclen, namelen;
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int error = 0;
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char *buf;
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again:
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if (fp->f_off >= fp->f_size)
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return (ENOENT);
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error = buf_read_file(f, &buf, &buf_size);
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if (error)
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return (error);
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ep = (struct iso_directory_record *)buf;
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if (isonum_711(ep->length) == 0) {
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daddr_t blkno;
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/* skip to next block, if any */
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blkno = fp->f_off / ISO_DEFAULT_BLOCK_SIZE;
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fp->f_off = (blkno + 1) * ISO_DEFAULT_BLOCK_SIZE;
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goto again;
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}
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namelen = isonum_711(ep->name_len);
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if (namelen == 1 && ep->name[0] == 1)
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namelen = 2;
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reclen = sizeof(struct dirent) - (MAXNAMLEN+1) + namelen + 1;
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|
reclen = (reclen + 3) & ~3;
|
|
|
|
d->d_fileno = isonum_733(ep->extent);
|
|
d->d_reclen = reclen;
|
|
if (isonum_711(ep->flags) & 2)
|
|
d->d_type = DT_DIR;
|
|
else
|
|
d->d_type = DT_REG;
|
|
d->d_namlen = namelen;
|
|
|
|
if (isonum_711(ep->name_len) == 1 && ep->name[0] == 0)
|
|
strcpy(d->d_name, ".");
|
|
else if (isonum_711(ep->name_len) == 1 && ep->name[0] == 1)
|
|
strcpy(d->d_name, "..");
|
|
else
|
|
bcopy(ep->name, d->d_name, d->d_namlen);
|
|
d->d_name[d->d_namlen] = 0;
|
|
|
|
fp->f_off += isonum_711(ep->length);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
cd9660_write(struct open_file *f, void *start, size_t size, size_t *resid)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
static off_t
|
|
cd9660_seek(struct open_file *f, off_t offset, int where)
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
fp->f_off = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
fp->f_off += offset;
|
|
break;
|
|
case SEEK_END:
|
|
fp->f_off = fp->f_size - offset;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
return fp->f_off;
|
|
}
|
|
|
|
static int
|
|
cd9660_stat(struct open_file *f, struct stat *sb)
|
|
{
|
|
struct file *fp = (struct file *)f->f_fsdata;
|
|
|
|
/* only important stuff */
|
|
sb->st_mode = S_IRUSR | S_IRGRP | S_IROTH;
|
|
if (fp->f_isdir)
|
|
sb->st_mode |= S_IFDIR;
|
|
else
|
|
sb->st_mode |= S_IFREG;
|
|
sb->st_uid = sb->st_gid = 0;
|
|
sb->st_size = fp->f_size;
|
|
return 0;
|
|
}
|