2018-04-05 19:40:46 +00:00
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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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/* Originally derived from libsa/cd9660.c: */
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/* $NetBSD: cd9660.c,v 1.5 1997/06/26 19:11:33 drochner Exp $ */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <fs/cd9660/iso.h>
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#include <fs/cd9660/cd9660_rrip.h>
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static uint64_t cd9660_lookup(const char *);
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static ssize_t cd9660_fsread(uint64_t, void *, size_t);
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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
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read_iso_block(void *buffer, daddr_t blkno)
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{
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return (drvread(&dsk, buffer, blkno * 4, 4));
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}
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static ISO_SUSP_HEADER *
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susp_lookup_record(const char *identifier, struct iso_directory_record *dp,
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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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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 = read_iso_block(susp_buffer,
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isonum_733(shc->location));
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/* Bail if it fails. */
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if (error != 0)
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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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/* Avoid infinite loops with corrupted file systems */
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if (isonum_711(sh->length) == 0)
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return (NULL);
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}
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}
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return (NULL);
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}
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static const char *
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rrip_lookup_name(struct iso_directory_record *dp, 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(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 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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}
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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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}
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if (isonum_711(sp->h.length) != sizeof(ISO_SUSP_PRESENT)) {
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return (0);
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}
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if (sp->signature[0] != 0xbe || sp->signature[1] != 0xef) {
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return (0);
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}
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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(SUSP_EXTREF, dp, 0);
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if (er == NULL) {
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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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dirmatch(const char *path, struct iso_directory_record *dp, int use_rrip,
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int lenskip)
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{
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size_t len;
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const char *cp = NULL, *name = NULL;
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int i, icase;
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if (use_rrip)
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cp = rrip_lookup_name(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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name = cp;
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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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/*
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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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}
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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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}
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return 1;
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}
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static uint64_t
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cd9660_lookup(const char *path)
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{
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static char blkbuf[ISO_DEFAULT_BLOCK_SIZE];
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struct iso_primary_descriptor *vd;
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struct iso_directory_record rec;
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struct iso_directory_record *dp = NULL;
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size_t dsize, off;
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daddr_t bno, boff;
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int rc, first, use_rrip, lenskip;
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uint64_t cookie;
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for (bno = 16;; bno++) {
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rc = read_iso_block(blkbuf, bno);
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vd = (struct iso_primary_descriptor *)blkbuf;
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if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
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return (0);
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if (isonum_711(vd->type) == ISO_VD_END)
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return (0);
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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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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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2018-04-07 14:40:09 +00:00
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lenskip = 0;
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2018-04-05 19:40:46 +00:00
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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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rc = read_iso_block(blkbuf, bno + boff);
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if (rc) {
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return (0);
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}
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boff++;
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dp = (struct iso_directory_record *) blkbuf;
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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(dp, &lenskip);
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if (dirmatch(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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/* If the new block has zero length, it is padding. */
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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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off += isonum_711(dp->length);
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}
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if (off >= dsize) {
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return (0);
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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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if ((isonum_711(rec.flags) & 2) != 0) {
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return (0);
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}
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cookie = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
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cookie = (cookie << 32) | isonum_733(rec.size);
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return (cookie);
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}
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static ssize_t
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cd9660_fsread(uint64_t cookie, void *buf, size_t nbytes)
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{
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static char blkbuf[ISO_DEFAULT_BLOCK_SIZE];
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static daddr_t curstart = 0, curblk = 0;
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daddr_t blk, blk_off;
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off_t byte_off;
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size_t size, remaining, n;
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char *s;
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size = cookie & 0xffffffff;
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blk = (cookie >> 32) & 0xffffffff;
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/* Make sure we're looking at the right file. */
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if (((blk << 32) | size) != cookie) {
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return (-1);
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}
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if (blk != curstart) {
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curstart = blk;
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fs_off = 0;
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}
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size -= fs_off;
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if (size < nbytes) {
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nbytes = size;
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}
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remaining = nbytes;
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s = buf;
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while (remaining > 0) {
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blk_off = fs_off >> ISO_DEFAULT_BLOCK_SHIFT;
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byte_off = fs_off & (ISO_DEFAULT_BLOCK_SIZE - 1);
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if (curblk != curstart + blk_off) {
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curblk = curstart + blk_off;
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read_iso_block(blkbuf, curblk);
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}
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if (remaining < ISO_DEFAULT_BLOCK_SIZE - byte_off) {
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n = remaining;
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} else {
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n = ISO_DEFAULT_BLOCK_SIZE - byte_off;
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}
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memcpy(s, blkbuf + byte_off, n);
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remaining -= n;
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s += n;
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fs_off += n;
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}
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return (nbytes);
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}
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