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-rw-r--r--stand/libsa/ufsread.c326
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diff --git a/stand/libsa/ufsread.c b/stand/libsa/ufsread.c
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+++ b/stand/libsa/ufsread.c
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+/*-
+ * Copyright (c) 2002 McAfee, Inc.
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by Marshall
+ * Kirk McKusick and McAfee Research,, the Security Research Division of
+ * McAfee, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as
+ * part of the DARPA CHATS research program
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*-
+ * Copyright (c) 1998 Robert Nordier
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are freely
+ * permitted provided that the above copyright notice and this
+ * paragraph and the following disclaimer are duplicated in all
+ * such forms.
+ *
+ * This software is provided "AS IS" and without any express or
+ * implied warranties, including, without limitation, the implied
+ * warranties of merchantability and fitness for a particular
+ * purpose.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <ufs/ufs/dinode.h>
+#include <ufs/ufs/dir.h>
+#include <ufs/ffs/fs.h>
+
+#ifdef UFS_SMALL_CGBASE
+/* XXX: Revert to old (broken for over 1.5Tb filesystems) version of cgbase
+ (see sys/ufs/ffs/fs.h rev 1.39) so that small boot loaders (e.g. boot2) can
+ support both UFS1 and UFS2. */
+#undef cgbase
+#define cgbase(fs, c) ((ufs2_daddr_t)((fs)->fs_fpg * (c)))
+#endif
+
+typedef uint32_t ufs_ino_t;
+
+/*
+ * We use 4k `virtual' blocks for filesystem data, whatever the actual
+ * filesystem block size. FFS blocks are always a multiple of 4k.
+ */
+#define VBLKSHIFT 12
+#define VBLKSIZE (1 << VBLKSHIFT)
+#define VBLKMASK (VBLKSIZE - 1)
+#define DBPERVBLK (VBLKSIZE / DEV_BSIZE)
+#define INDIRPERVBLK(fs) (NINDIR(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
+#define IPERVBLK(fs) (INOPB(fs) / ((fs)->fs_bsize >> VBLKSHIFT))
+#define INO_TO_VBA(fs, ipervblk, x) \
+ (fsbtodb(fs, cgimin(fs, ino_to_cg(fs, x))) + \
+ (((x) % (fs)->fs_ipg) / (ipervblk) * DBPERVBLK))
+#define INO_TO_VBO(ipervblk, x) ((x) % ipervblk)
+#define FS_TO_VBA(fs, fsb, off) (fsbtodb(fs, fsb) + \
+ ((off) / VBLKSIZE) * DBPERVBLK)
+#define FS_TO_VBO(fs, fsb, off) ((off) & VBLKMASK)
+
+/* Buffers that must not span a 64k boundary. */
+struct dmadat {
+ char blkbuf[VBLKSIZE]; /* filesystem blocks */
+ char indbuf[VBLKSIZE]; /* indir blocks */
+ char sbbuf[SBLOCKSIZE]; /* superblock */
+ char secbuf[DEV_BSIZE]; /* for MBR/disklabel */
+};
+static struct dmadat *dmadat;
+
+static ufs_ino_t lookup(const char *);
+static ssize_t fsread(ufs_ino_t, void *, size_t);
+
+static uint8_t ls, dsk_meta;
+static uint32_t fs_off;
+
+static __inline uint8_t
+fsfind(const char *name, ufs_ino_t * ino)
+{
+ static char buf[DEV_BSIZE];
+ static struct direct d;
+ char *s;
+ ssize_t n;
+
+ fs_off = 0;
+ while ((n = fsread(*ino, buf, DEV_BSIZE)) > 0)
+ for (s = buf; s < buf + DEV_BSIZE;) {
+ memcpy(&d, s, sizeof(struct direct));
+ if (ls)
+ printf("%s ", d.d_name);
+ else if (!strcmp(name, d.d_name)) {
+ *ino = d.d_ino;
+ return d.d_type;
+ }
+ s += d.d_reclen;
+ }
+ if (n != -1 && ls)
+ printf("\n");
+ return 0;
+}
+
+static ufs_ino_t
+lookup(const char *path)
+{
+ static char name[UFS_MAXNAMLEN + 1];
+ const char *s;
+ ufs_ino_t ino;
+ ssize_t n;
+ uint8_t dt;
+
+ ino = UFS_ROOTINO;
+ dt = DT_DIR;
+ for (;;) {
+ if (*path == '/')
+ path++;
+ if (!*path)
+ break;
+ for (s = path; *s && *s != '/'; s++);
+ if ((n = s - path) > UFS_MAXNAMLEN)
+ return 0;
+ ls = *path == '?' && n == 1 && !*s;
+ memcpy(name, path, n);
+ name[n] = 0;
+ if (dt != DT_DIR) {
+ printf("%s: not a directory.\n", name);
+ return (0);
+ }
+ if ((dt = fsfind(name, &ino)) <= 0)
+ break;
+ path = s;
+ }
+ return dt == DT_REG ? ino : 0;
+}
+
+/*
+ * Possible superblock locations ordered from most to least likely.
+ */
+static int sblock_try[] = SBLOCKSEARCH;
+
+#if defined(UFS2_ONLY)
+#define DIP(field) dp2.field
+#elif defined(UFS1_ONLY)
+#define DIP(field) dp1.field
+#else
+#define DIP(field) fs.fs_magic == FS_UFS1_MAGIC ? dp1.field : dp2.field
+#endif
+
+static ssize_t
+fsread_size(ufs_ino_t inode, void *buf, size_t nbyte, size_t *fsizep)
+{
+#ifndef UFS2_ONLY
+ static struct ufs1_dinode dp1;
+ ufs1_daddr_t addr1;
+#endif
+#ifndef UFS1_ONLY
+ static struct ufs2_dinode dp2;
+#endif
+ static struct fs fs;
+ static ufs_ino_t inomap;
+ char *blkbuf;
+ void *indbuf;
+ char *s;
+ size_t n, nb, size, off, vboff;
+ ufs_lbn_t lbn;
+ ufs2_daddr_t addr2, vbaddr;
+ static ufs2_daddr_t blkmap, indmap;
+ u_int u;
+
+ /* Basic parameter validation. */
+ if ((buf == NULL && nbyte != 0) || dmadat == NULL)
+ return (-1);
+
+ blkbuf = dmadat->blkbuf;
+ indbuf = dmadat->indbuf;
+
+ /*
+ * Force probe if inode is zero to ensure we have a valid fs, otherwise
+ * when probing multiple paritions, reads from subsequent parititions
+ * will incorrectly succeed.
+ */
+ if (!dsk_meta || inode == 0) {
+ inomap = 0;
+ dsk_meta = 0;
+ for (n = 0; sblock_try[n] != -1; n++) {
+ if (dskread(dmadat->sbbuf, sblock_try[n] / DEV_BSIZE,
+ SBLOCKSIZE / DEV_BSIZE))
+ return -1;
+ memcpy(&fs, dmadat->sbbuf, sizeof(struct fs));
+ if ((
+#if defined(UFS1_ONLY)
+ fs.fs_magic == FS_UFS1_MAGIC
+#elif defined(UFS2_ONLY)
+ (fs.fs_magic == FS_UFS2_MAGIC &&
+ fs.fs_sblockloc == sblock_try[n])
+#else
+ fs.fs_magic == FS_UFS1_MAGIC ||
+ (fs.fs_magic == FS_UFS2_MAGIC &&
+ fs.fs_sblockloc == sblock_try[n])
+#endif
+ ) &&
+ fs.fs_bsize <= MAXBSIZE &&
+ fs.fs_bsize >= (int32_t)sizeof(struct fs))
+ break;
+ }
+ if (sblock_try[n] == -1) {
+ return -1;
+ }
+ dsk_meta++;
+ } else
+ memcpy(&fs, dmadat->sbbuf, sizeof(struct fs));
+ if (!inode)
+ return 0;
+ if (inomap != inode) {
+ n = IPERVBLK(&fs);
+ if (dskread(blkbuf, INO_TO_VBA(&fs, n, inode), DBPERVBLK))
+ return -1;
+ n = INO_TO_VBO(n, inode);
+#if defined(UFS1_ONLY)
+ memcpy(&dp1, (struct ufs1_dinode *)(void *)blkbuf + n,
+ sizeof(dp1));
+#elif defined(UFS2_ONLY)
+ memcpy(&dp2, (struct ufs2_dinode *)(void *)blkbuf + n,
+ sizeof(dp2));
+#else
+ if (fs.fs_magic == FS_UFS1_MAGIC)
+ memcpy(&dp1, (struct ufs1_dinode *)(void *)blkbuf + n,
+ sizeof(dp1));
+ else
+ memcpy(&dp2, (struct ufs2_dinode *)(void *)blkbuf + n,
+ sizeof(dp2));
+#endif
+ inomap = inode;
+ fs_off = 0;
+ blkmap = indmap = 0;
+ }
+ s = buf;
+ size = DIP(di_size);
+ n = size - fs_off;
+ if (nbyte > n)
+ nbyte = n;
+ nb = nbyte;
+ while (nb) {
+ lbn = lblkno(&fs, fs_off);
+ off = blkoff(&fs, fs_off);
+ if (lbn < UFS_NDADDR) {
+ addr2 = DIP(di_db[lbn]);
+ } else if (lbn < UFS_NDADDR + NINDIR(&fs)) {
+ n = INDIRPERVBLK(&fs);
+ addr2 = DIP(di_ib[0]);
+ u = (u_int)(lbn - UFS_NDADDR) / n * DBPERVBLK;
+ vbaddr = fsbtodb(&fs, addr2) + u;
+ if (indmap != vbaddr) {
+ if (dskread(indbuf, vbaddr, DBPERVBLK))
+ return -1;
+ indmap = vbaddr;
+ }
+ n = (lbn - UFS_NDADDR) & (n - 1);
+#if defined(UFS1_ONLY)
+ memcpy(&addr1, (ufs1_daddr_t *)indbuf + n,
+ sizeof(ufs1_daddr_t));
+ addr2 = addr1;
+#elif defined(UFS2_ONLY)
+ memcpy(&addr2, (ufs2_daddr_t *)indbuf + n,
+ sizeof(ufs2_daddr_t));
+#else
+ if (fs.fs_magic == FS_UFS1_MAGIC) {
+ memcpy(&addr1, (ufs1_daddr_t *)indbuf + n,
+ sizeof(ufs1_daddr_t));
+ addr2 = addr1;
+ } else
+ memcpy(&addr2, (ufs2_daddr_t *)indbuf + n,
+ sizeof(ufs2_daddr_t));
+#endif
+ } else
+ return -1;
+ vbaddr = fsbtodb(&fs, addr2) + (off >> VBLKSHIFT) * DBPERVBLK;
+ vboff = off & VBLKMASK;
+ n = sblksize(&fs, (off_t)size, lbn) - (off & ~VBLKMASK);
+ if (n > VBLKSIZE)
+ n = VBLKSIZE;
+ if (blkmap != vbaddr) {
+ if (dskread(blkbuf, vbaddr, n >> DEV_BSHIFT))
+ return -1;
+ blkmap = vbaddr;
+ }
+ n -= vboff;
+ if (n > nb)
+ n = nb;
+ memcpy(s, blkbuf + vboff, n);
+ s += n;
+ fs_off += n;
+ nb -= n;
+ }
+
+ if (fsizep != NULL)
+ *fsizep = size;
+
+ return nbyte;
+}
+
+static ssize_t
+fsread(ufs_ino_t inode, void *buf, size_t nbyte)
+{
+
+ return fsread_size(inode, buf, nbyte, NULL);
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-02 16:59:44 +0000