HardenedBSD/sbin/fsck_ffs/pass1.c

/*
 * Copyright (c) 1980, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)pass1.c	8.6 (Berkeley) 4/28/95";
#endif
static const char rcsid[] =
	"$Id: pass1.c,v 1.13 1998/07/06 19:11:35 bde Exp $";
#endif /* not lint */

#include <sys/param.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <string.h>

#include "fsck.h"

static ufs_daddr_t badblk;
static ufs_daddr_t dupblk;
static ino_t lastino;		/* last inode in use */

static void checkinode __P((ino_t inumber, struct inodesc *));

void
pass1()
{
	u_int8_t *cp;
	ino_t inumber;
	int c, i, cgd, inosused;
	struct inostat *info;
	struct inodesc idesc;

	/*
	 * Set file system reserved blocks in used block map.
	 */
	for (c = 0; c < sblock.fs_ncg; c++) {
		cgd = cgdmin(&sblock, c);
		if (c == 0) {
			i = cgbase(&sblock, c);
			cgd += howmany(sblock.fs_cssize, sblock.fs_fsize);
		} else
			i = cgsblock(&sblock, c);
		for (; i < cgd; i++)
			setbmap(i);
	}
	/*
	 * Find all allocated blocks.
	 */
	memset(&idesc, 0, sizeof(struct inodesc));
	idesc.id_type = ADDR;
	idesc.id_func = pass1check;
	n_files = n_blks = 0;
	for (c = 0; c < sblock.fs_ncg; c++) {
		inumber = c * sblock.fs_ipg;
		setinodebuf(inumber);
		inosused = sblock.fs_ipg;
		/*
		 * If we are using soft updates, then we can trust the
		 * cylinder group inode allocation maps to tell us which
		 * inodes are allocated. We will scan the used inode map
		 * to find the inodes that are really in use, and then
		 * read only those inodes in from disk.
		 */
		if (preen && usedsoftdep) {
			getblk(&cgblk, cgtod(&sblock, c), sblock.fs_cgsize);
			if (!cg_chkmagic(&cgrp))
				pfatal("CG %d: BAD MAGIC NUMBER\n", c);
			cp = &cg_inosused(&cgrp)[(sblock.fs_ipg - 1) / NBBY];
			for ( ; inosused > 0; inosused -= NBBY, cp--) {
				if (*cp == 0)
					continue;
				for (i = 1 << (NBBY - 1); i > 0; i >>= 1) {
					if (*cp & i)
						break;
					inosused--;
				}
				break;
			}
			if (inosused < 0)
				inosused = 0;
		}
		/*
		 * Allocate inoinfo structures for the allocated inodes.
		 */
		inostathead[c].il_numalloced = inosused;
		if (inosused == 0) {
			inostathead[c].il_stat = 0;
			continue;
		}
		info = calloc((unsigned)inosused, sizeof(struct inostat));
		if (info == NULL)
			pfatal("cannot alloc %u bytes for inoinfo\n",
			    (unsigned)(sizeof(struct inostat) * inosused));
		inostathead[c].il_stat = info;
		/*
		 * Scan the allocated inodes.
		 */
		for (i = 0; i < inosused; i++, inumber++) {
			if (inumber < ROOTINO) {
				(void)getnextinode(inumber);
				continue;
			}
			checkinode(inumber, &idesc);
		}
		lastino += 1;
		if (inosused < sblock.fs_ipg || inumber == lastino)
			continue;
		/*
		 * If we were not able to determine in advance which inodes
		 * were in use, then reduce the size of the inoinfo structure
		 * to the size necessary to describe the inodes that we
		 * really found.
		 */
		inosused = lastino - (c * sblock.fs_ipg);
		if (inosused < 0)
			inosused = 0;
		inostathead[c].il_numalloced = inosused;
		if (inosused == 0) {
			free(inostathead[c].il_stat);
			inostathead[c].il_stat = 0;
			continue;
		}
		info = calloc((unsigned)inosused, sizeof(struct inostat));
		if (info == NULL)
			pfatal("cannot alloc %u bytes for inoinfo\n",
			    (unsigned)(sizeof(struct inostat) * inosused));
		memmove(info, inostathead[c].il_stat, inosused * sizeof(*info));
		free(inostathead[c].il_stat);
		inostathead[c].il_stat = info;
	}
	freeinodebuf();
}

static void
checkinode(inumber, idesc)
	ino_t inumber;
	register struct inodesc *idesc;
{
	register struct dinode *dp;
	struct zlncnt *zlnp;
	int ndb, j;
	mode_t mode;
	char *symbuf;

	dp = getnextinode(inumber);
	mode = dp->di_mode & IFMT;
	if (mode == 0) {
		if (memcmp(dp->di_db, zino.di_db,
			NDADDR * sizeof(ufs_daddr_t)) ||
		    memcmp(dp->di_ib, zino.di_ib,
			NIADDR * sizeof(ufs_daddr_t)) ||
		    dp->di_mode || dp->di_size) {
			pfatal("PARTIALLY ALLOCATED INODE I=%lu", inumber);
			if (reply("CLEAR") == 1) {
				dp = ginode(inumber);
				clearinode(dp);
				inodirty();
			}
		}
		inoinfo(inumber)->ino_state = USTATE;
		return;
	}
	lastino = inumber;
	if (/* dp->di_size < 0 || */
	    dp->di_size + sblock.fs_bsize - 1 < dp->di_size ||
	    (mode == IFDIR && dp->di_size > MAXDIRSIZE)) {
		if (debug)
			printf("bad size %qu:", dp->di_size);
		goto unknown;
	}
	if (!preen && mode == IFMT && reply("HOLD BAD BLOCK") == 1) {
		dp = ginode(inumber);
		dp->di_size = sblock.fs_fsize;
		dp->di_mode = IFREG|0600;
		inodirty();
	}
	ndb = howmany(dp->di_size, sblock.fs_bsize);
	if (ndb < 0) {
		if (debug)
			printf("bad size %qu ndb %d:",
				dp->di_size, ndb);
		goto unknown;
	}
	if (mode == IFBLK || mode == IFCHR)
		ndb++;
	if (mode == IFLNK) {
		if (doinglevel2 &&
		    dp->di_size > 0 && dp->di_size < MAXSYMLINKLEN &&
		    dp->di_blocks != 0) {
			symbuf = alloca(secsize);
			if (bread(fsreadfd, symbuf,
			    fsbtodb(&sblock, dp->di_db[0]),
			    (long)secsize) != 0)
				errx(EEXIT, "cannot read symlink");
			if (debug) {
				symbuf[dp->di_size] = 0;
				printf("convert symlink %lu(%s) of size %ld\n",
				    (u_long)inumber, symbuf, (long)dp->di_size);
			}
			dp = ginode(inumber);
			memmove(dp->di_shortlink, symbuf, (long)dp->di_size);
			dp->di_blocks = 0;
			inodirty();
		}
		/*
		 * Fake ndb value so direct/indirect block checks below
		 * will detect any garbage after symlink string.
		 */
		if (dp->di_size < sblock.fs_maxsymlinklen) {
			ndb = howmany(dp->di_size, sizeof(ufs_daddr_t));
			if (ndb > NDADDR) {
				j = ndb - NDADDR;
				for (ndb = 1; j > 1; j--)
					ndb *= NINDIR(&sblock);
				ndb += NDADDR;
			}
		}
	}
	for (j = ndb; j < NDADDR; j++)
		if (dp->di_db[j] != 0) {
			if (debug)
				printf("bad direct addr: %ld\n",
				    (long)dp->di_db[j]);
			goto unknown;
		}
	for (j = 0, ndb -= NDADDR; ndb > 0; j++)
		ndb /= NINDIR(&sblock);
	for (; j < NIADDR; j++)
		if (dp->di_ib[j] != 0) {
			if (debug)
				printf("bad indirect addr: %ld\n",
				    (long)dp->di_ib[j]);
			goto unknown;
		}
	if (ftypeok(dp) == 0)
		goto unknown;
	n_files++;
	inoinfo(inumber)->ino_linkcnt = dp->di_nlink;
	if (dp->di_nlink <= 0) {
		zlnp = (struct zlncnt *)malloc(sizeof *zlnp);
		if (zlnp == NULL) {
			pfatal("LINK COUNT TABLE OVERFLOW");
			if (reply("CONTINUE") == 0) {
				ckfini(0);
				exit(EEXIT);
			}
		} else {
			zlnp->zlncnt = inumber;
			zlnp->next = zlnhead;
			zlnhead = zlnp;
		}
	}
	if (mode == IFDIR) {
		if (dp->di_size == 0)
			inoinfo(inumber)->ino_state = DCLEAR;
		else
			inoinfo(inumber)->ino_state = DSTATE;
		cacheino(dp, inumber);
		countdirs++;
	} else
		inoinfo(inumber)->ino_state = FSTATE;
	inoinfo(inumber)->ino_type = IFTODT(mode);
	if (doinglevel2 &&
	    (dp->di_ouid != (u_short)-1 || dp->di_ogid != (u_short)-1)) {
		dp = ginode(inumber);
		dp->di_uid = dp->di_ouid;
		dp->di_ouid = -1;
		dp->di_gid = dp->di_ogid;
		dp->di_ogid = -1;
		inodirty();
	}
	badblk = dupblk = 0;
	idesc->id_number = inumber;
	(void)ckinode(dp, idesc);
	idesc->id_entryno *= btodb(sblock.fs_fsize);
	if (dp->di_blocks != idesc->id_entryno) {
		pwarn("INCORRECT BLOCK COUNT I=%lu (%ld should be %ld)",
		    inumber, dp->di_blocks, idesc->id_entryno);
		if (preen)
			printf(" (CORRECTED)\n");
		else if (reply("CORRECT") == 0)
			return;
		dp = ginode(inumber);
		dp->di_blocks = idesc->id_entryno;
		inodirty();
	}
	return;
unknown:
	pfatal("UNKNOWN FILE TYPE I=%lu", inumber);
	inoinfo(inumber)->ino_state = FCLEAR;
	if (reply("CLEAR") == 1) {
		inoinfo(inumber)->ino_state = USTATE;
		dp = ginode(inumber);
		clearinode(dp);
		inodirty();
	}
}

int
pass1check(idesc)
	register struct inodesc *idesc;
{
	int res = KEEPON;
	int anyout, nfrags;
	ufs_daddr_t blkno = idesc->id_blkno;
	register struct dups *dlp;
	struct dups *new;

	if ((anyout = chkrange(blkno, idesc->id_numfrags)) != 0) {
		blkerror(idesc->id_number, "BAD", blkno);
		if (badblk++ >= MAXBAD) {
			pwarn("EXCESSIVE BAD BLKS I=%lu",
				idesc->id_number);
			if (preen)
				printf(" (SKIPPING)\n");
			else if (reply("CONTINUE") == 0) {
				ckfini(0);
				exit(EEXIT);
			}
			return (STOP);
		}
	}
	for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
		if (anyout && chkrange(blkno, 1)) {
			res = SKIP;
		} else if (!testbmap(blkno)) {
			n_blks++;
			setbmap(blkno);
		} else {
			blkerror(idesc->id_number, "DUP", blkno);
			if (dupblk++ >= MAXDUP) {
				pwarn("EXCESSIVE DUP BLKS I=%lu",
					idesc->id_number);
				if (preen)
					printf(" (SKIPPING)\n");
				else if (reply("CONTINUE") == 0) {
					ckfini(0);
					exit(EEXIT);
				}
				return (STOP);
			}
			new = (struct dups *)malloc(sizeof(struct dups));
			if (new == NULL) {
				pfatal("DUP TABLE OVERFLOW.");
				if (reply("CONTINUE") == 0) {
					ckfini(0);
					exit(EEXIT);
				}
				return (STOP);
			}
			new->dup = blkno;
			if (muldup == 0) {
				duplist = muldup = new;
				new->next = 0;
			} else {
				new->next = muldup->next;
				muldup->next = new;
			}
			for (dlp = duplist; dlp != muldup; dlp = dlp->next)
				if (dlp->dup == blkno)
					break;
			if (dlp == muldup && dlp->dup != blkno)
				muldup = new;
		}
		/*
		 * count the number of blocks found in id_entryno
		 */
		idesc->id_entryno++;
	}
	return (res);
}