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freebsd-dev/sbin/quotacheck/quotacheck.c
Kirk McKusick b21582ee03 Add a flags parameter to the ffs_sbget() function that reads UFS superblocks. 
Rather than trying to shoehorn flags into the requested superblock
address, create a separate flags parameter to the ffs_sbget()
function in sys/ufs/ffs/ffs_subr.c. The ffs_sbget() function is
used both in the kernel and in user-level utilities through export
to the sbget() function in the libufs(3) library (see sbget(3)
for details). The kernel uses ffs_sbget() when mounting UFS
filesystems, in the glabel(8) and gjournal(8) GEOM utilities,
and in the standalone library used when booting the system
from a UFS root filesystem.

The ffs_sbget() function reads the superblock located at the byte
offset specified by its sblockloc parameter. The value UFS_STDSB
may be specified for sblockloc to request that the standard
location for the superblock be read.

The two existing options are now flags:

UFS_NOHASHFAIL will note if the check hash is wrong but will still
   return the superblock. This is used by the bootstrap code to
   give the system a chance to come up so that fsck can be run to
   correct the problem.

UFS_NOMSG indicates that superblock inconsistency error messages
   should not be printed. It is used by programs like fsck that
   want to print their own error message and programs like glabel(8)
   that just want to know if a UFS filesystem exists on a partition.

One additional flag is added:

UFS_NOCSUM causes only the superblock itself to be returned, but does
   not read in any auxiliary data structures like the cylinder group
   summary information. It is used by clients like glabel(8) that
   just want to check for possible filesystem types. Using UFS_NOCSUM
   skips the superblock checks for csum data which allows superblocks
   that have corrupted csum data to be read and used.

The validate_sblock() function checks that the superblock has not
been corrupted in a way that can crash or hang the system. Unless
the UFS_NOMSG flag is specified, it will print out any errors that
it finds. Prior to this commit, validate_sblock() returned as soon
as it found an inconsistency so would print at most one message.
It now does all its checks so when UFS_NOMSG has not been specified
will print out everything that it finds inconsistent.

Sponsored by: The FreeBSD Foundation
2022-07-30 22:51:38 -07:00

725 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1980, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Elz at The University of Melbourne.
*
* 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. 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.
*/
#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)quotacheck.c 8.3 (Berkeley) 1/29/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Fix up / report on disk quotas & usage
*/
#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/quota.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <grp.h>
#include <libufs.h>
#include <libutil.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "quotacheck.h"
const char *qfname = QUOTAFILENAME;
const char *qfextension[] = INITQFNAMES;
const char *quotagroup = QUOTAGROUP;
union {
struct fs sblk;
char dummy[MAXBSIZE];
} sb_un;
#define sblock sb_un.sblk
union {
struct cg cgblk;
char dummy[MAXBSIZE];
} cg_un;
#define cgblk cg_un.cgblk
long dev_bsize = 1;
ino_t maxino;
union dinode {
struct ufs1_dinode dp1;
struct ufs2_dinode dp2;
};
#define DIP(dp, field) \
((sblock.fs_magic == FS_UFS1_MAGIC) ? \
(dp)->dp1.field : (dp)->dp2.field)
#define HASUSR 1
#define HASGRP 2
struct fileusage {
struct fileusage *fu_next;
u_long fu_curinodes;
u_long fu_curblocks;
u_long fu_id;
char fu_name[1];
/* actually bigger */
};
#define FUHASH 1024 /* must be power of two */
struct fileusage *fuhead[MAXQUOTAS][FUHASH];
int aflag; /* all file systems */
int cflag; /* convert format to 32 or 64 bit size */
int gflag; /* check group quotas */
int uflag; /* check user quotas */
int vflag; /* verbose */
int fi; /* open disk file descriptor */
struct fileusage *
addid(u_long, int, char *, const char *);
void blkread(ufs2_daddr_t, char *, long);
void freeinodebuf(void);
union dinode *
getnextinode(ino_t);
int getquotagid(void);
struct fileusage *
lookup(u_long, int);
int oneof(char *, char*[], int);
void printchanges(const char *, int, struct dqblk *, struct fileusage *,
u_long);
void setinodebuf(ino_t);
int update(const char *, struct quotafile *, int);
void usage(void);
int
main(int argc, char *argv[])
{
struct fstab *fs;
struct passwd *pw;
struct group *gr;
struct quotafile *qfu, *qfg;
int i, argnum, maxrun, errs, ch;
long done = 0;
char *name;
errs = maxrun = 0;
while ((ch = getopt(argc, argv, "ac:guvl:")) != -1) {
switch(ch) {
case 'a':
aflag++;
break;
case 'c':
if (cflag)
usage();
cflag = atoi(optarg);
break;
case 'g':
gflag++;
break;
case 'u':
uflag++;
break;
case 'v':
vflag++;
break;
case 'l':
maxrun = atoi(optarg);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if ((argc == 0 && !aflag) || (argc > 0 && aflag))
usage();
if (cflag && cflag != 32 && cflag != 64)
usage();
if (!gflag && !uflag) {
gflag++;
uflag++;
}
if (gflag) {
setgrent();
while ((gr = getgrent()) != NULL)
(void) addid((u_long)gr->gr_gid, GRPQUOTA, gr->gr_name,
NULL);
endgrent();
}
if (uflag) {
setpwent();
while ((pw = getpwent()) != NULL)
(void) addid((u_long)pw->pw_uid, USRQUOTA, pw->pw_name,
NULL);
endpwent();
}
/*
* The maxrun (-l) option is now deprecated.
*/
if (maxrun > 0)
warnx("the -l option is now deprecated");
if (aflag)
exit(checkfstab(uflag, gflag));
if (setfsent() == 0)
errx(1, "%s: can't open", FSTAB);
while ((fs = getfsent()) != NULL) {
if (((argnum = oneof(fs->fs_file, argv, argc)) >= 0 ||
(argnum = oneof(fs->fs_spec, argv, argc)) >= 0) &&
(name = blockcheck(fs->fs_spec))) {
done |= 1 << argnum;
qfu = NULL;
if (uflag)
qfu = quota_open(fs, USRQUOTA, O_CREAT|O_RDWR);
qfg = NULL;
if (gflag)
qfg = quota_open(fs, GRPQUOTA, O_CREAT|O_RDWR);
if (qfu == NULL && qfg == NULL)
continue;
errs += chkquota(name, qfu, qfg);
if (qfu)
quota_close(qfu);
if (qfg)
quota_close(qfg);
}
}
endfsent();
for (i = 0; i < argc; i++)
if ((done & (1 << i)) == 0)
fprintf(stderr, "%s not found in %s\n",
argv[i], FSTAB);
exit(errs);
}
void
usage(void)
{
(void)fprintf(stderr, "%s\n%s\n",
"usage: quotacheck [-guv] [-c 32 | 64] [-l maxrun] -a",
" quotacheck [-guv] [-c 32 | 64] filesystem ...");
exit(1);
}
/*
* Scan the specified file system to check quota(s) present on it.
*/
int
chkquota(char *specname, struct quotafile *qfu, struct quotafile *qfg)
{
struct fileusage *fup;
union dinode *dp;
struct fs *fs;
int i, ret, mode, errs = 0;
u_int32_t cg;
ino_t curino, ino, inosused, userino = 0, groupino = 0;
dev_t dev, userdev = 0, groupdev = 0;
struct stat sb;
const char *mntpt;
char *cp;
if (qfu != NULL)
mntpt = quota_fsname(qfu);
else if (qfg != NULL)
mntpt = quota_fsname(qfg);
else
errx(1, "null quotafile information passed to chkquota()\n");
if (cflag) {
if (vflag && qfu != NULL)
printf("%s: convert user quota to %d bits\n",
mntpt, cflag);
if (qfu != NULL && quota_convert(qfu, cflag) < 0) {
if (errno == EBADF)
errx(1,
"%s: cannot convert an active quota file",
mntpt);
err(1, "user quota conversion to size %d failed",
cflag);
}
if (vflag && qfg != NULL)
printf("%s: convert group quota to %d bits\n",
mntpt, cflag);
if (qfg != NULL && quota_convert(qfg, cflag) < 0) {
if (errno == EBADF)
errx(1,
"%s: cannot convert an active quota file",
mntpt);
err(1, "group quota conversion to size %d failed",
cflag);
}
}
if ((fi = open(specname, O_RDONLY, 0)) < 0) {
warn("%s", specname);
return (1);
}
if ((stat(mntpt, &sb)) < 0) {
warn("%s", mntpt);
return (1);
}
dev = sb.st_dev;
if (vflag) {
(void)printf("*** Checking ");
if (qfu)
(void)printf("user%s", qfg ? " and " : "");
if (qfg)
(void)printf("group");
(void)printf(" quotas for %s (%s)\n", specname, mntpt);
}
if (qfu) {
if (stat(quota_qfname(qfu), &sb) == 0) {
userino = sb.st_ino;
userdev = sb.st_dev;
}
}
if (qfg) {
if (stat(quota_qfname(qfg), &sb) == 0) {
groupino = sb.st_ino;
groupdev = sb.st_dev;
}
}
sync();
if ((ret = sbget(fi, &fs, UFS_STDSB, UFS_NOCSUM)) != 0) {
switch (ret) {
case ENOENT:
warn("Cannot find file system superblock");
return (1);
default:
warn("Unable to read file system superblock");
return (1);
}
}
bcopy(fs, &sblock, fs->fs_sbsize);
free(fs);
dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
maxino = sblock.fs_ncg * sblock.fs_ipg;
for (cg = 0; cg < sblock.fs_ncg; cg++) {
ino = cg * sblock.fs_ipg;
setinodebuf(ino);
blkread(fsbtodb(&sblock, cgtod(&sblock, cg)), (char *)(&cgblk),
sblock.fs_cgsize);
if (sblock.fs_magic == FS_UFS2_MAGIC)
inosused = cgblk.cg_initediblk;
else
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 (sblock.fs_flags & FS_DOSOFTDEP) {
if (!cg_chkmagic(&cgblk))
errx(1, "CG %d: BAD MAGIC NUMBER\n", cg);
cp = &cg_inosused(&cgblk)[(inosused - 1) / CHAR_BIT];
for ( ; inosused > 0; inosused -= CHAR_BIT, cp--) {
if (*cp == 0)
continue;
for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
if (*cp & i)
break;
inosused--;
}
break;
}
if (inosused <= 0)
continue;
}
for (curino = 0; curino < inosused; curino++, ino++) {
if ((dp = getnextinode(ino)) == NULL ||
ino < UFS_ROOTINO ||
(mode = DIP(dp, di_mode) & IFMT) == 0)
continue;
/*
* XXX: Do not account for UIDs or GIDs that appear
* to be negative to prevent generating 100GB+
* quota files.
*/
if ((int)DIP(dp, di_uid) < 0 ||
(int)DIP(dp, di_gid) < 0) {
if (vflag) {
if (aflag)
(void)printf("%s: ", mntpt);
(void)printf("out of range UID/GID (%u/%u) ino=%ju\n",
DIP(dp, di_uid), DIP(dp,di_gid),
(uintmax_t)ino);
}
continue;
}
/*
* Do not account for file system snapshot files
* or the actual quota data files to be consistent
* with how they are handled inside the kernel.
*/
#ifdef SF_SNAPSHOT
if (DIP(dp, di_flags) & SF_SNAPSHOT)
continue;
#endif
if ((ino == userino && dev == userdev) ||
(ino == groupino && dev == groupdev))
continue;
if (qfg) {
fup = addid((u_long)DIP(dp, di_gid), GRPQUOTA,
NULL, mntpt);
fup->fu_curinodes++;
if (mode == IFREG || mode == IFDIR ||
mode == IFLNK)
fup->fu_curblocks += DIP(dp, di_blocks);
}
if (qfu) {
fup = addid((u_long)DIP(dp, di_uid), USRQUOTA,
NULL, mntpt);
fup->fu_curinodes++;
if (mode == IFREG || mode == IFDIR ||
mode == IFLNK)
fup->fu_curblocks += DIP(dp, di_blocks);
}
}
}
freeinodebuf();
if (qfu)
errs += update(mntpt, qfu, USRQUOTA);
if (qfg)
errs += update(mntpt, qfg, GRPQUOTA);
close(fi);
(void)fflush(stdout);
return (errs);
}
/*
* Update a specified quota file.
*/
int
update(const char *fsname, struct quotafile *qf, int type)
{
struct fileusage *fup;
u_long id, lastid, highid = 0;
struct dqblk dqbuf;
struct stat sb;
static struct dqblk zerodqbuf;
static struct fileusage zerofileusage;
/*
* Scan the on-disk quota file and record any usage changes.
*/
lastid = quota_maxid(qf);
for (id = 0; id <= lastid; id++) {
if (quota_read(qf, &dqbuf, id) < 0)
dqbuf = zerodqbuf;
if ((fup = lookup(id, type)) == NULL)
fup = &zerofileusage;
if (fup->fu_curinodes || fup->fu_curblocks ||
dqbuf.dqb_bsoftlimit || dqbuf.dqb_bhardlimit ||
dqbuf.dqb_isoftlimit || dqbuf.dqb_ihardlimit)
highid = id;
if (dqbuf.dqb_curinodes == fup->fu_curinodes &&
dqbuf.dqb_curblocks == fup->fu_curblocks) {
fup->fu_curinodes = 0;
fup->fu_curblocks = 0;
continue;
}
printchanges(fsname, type, &dqbuf, fup, id);
dqbuf.dqb_curinodes = fup->fu_curinodes;
dqbuf.dqb_curblocks = fup->fu_curblocks;
(void) quota_write_usage(qf, &dqbuf, id);
fup->fu_curinodes = 0;
fup->fu_curblocks = 0;
}
/*
* Walk the hash table looking for ids with non-zero usage
* that are not currently recorded in the quota file. E.g.
* ids that are past the end of the current file.
*/
for (id = 0; id < FUHASH; id++) {
for (fup = fuhead[type][id]; fup != NULL; fup = fup->fu_next) {
if (fup->fu_id <= lastid)
continue;
if (fup->fu_curinodes == 0 && fup->fu_curblocks == 0)
continue;
bzero(&dqbuf, sizeof(struct dqblk));
if (fup->fu_id > highid)
highid = fup->fu_id;
printchanges(fsname, type, &dqbuf, fup, fup->fu_id);
dqbuf.dqb_curinodes = fup->fu_curinodes;
dqbuf.dqb_curblocks = fup->fu_curblocks;
(void) quota_write_usage(qf, &dqbuf, fup->fu_id);
fup->fu_curinodes = 0;
fup->fu_curblocks = 0;
}
}
/*
* If this is old format file, then size may be smaller,
* so ensure that we only truncate when it will make things
* smaller, and not if it will grow an old format file.
*/
if (highid < lastid &&
stat(quota_qfname(qf), &sb) == 0 &&
sb.st_size > (off_t)((highid + 2) * sizeof(struct dqblk)))
truncate(quota_qfname(qf),
(((off_t)highid + 2) * sizeof(struct dqblk)));
return (0);
}
/*
* Check to see if target appears in list of size cnt.
*/
int
oneof(char *target, char *list[], int cnt)
{
int i;
for (i = 0; i < cnt; i++)
if (strcmp(target, list[i]) == 0)
return (i);
return (-1);
}
/*
* Determine the group identifier for quota files.
*/
int
getquotagid(void)
{
struct group *gr;
if ((gr = getgrnam(quotagroup)) != NULL)
return (gr->gr_gid);
return (-1);
}
/*
* Routines to manage the file usage table.
*
* Lookup an id of a specific type.
*/
struct fileusage *
lookup(u_long id, int type)
{
struct fileusage *fup;
for (fup = fuhead[type][id & (FUHASH-1)]; fup != NULL; fup = fup->fu_next)
if (fup->fu_id == id)
return (fup);
return (NULL);
}
/*
* Add a new file usage id if it does not already exist.
*/
struct fileusage *
addid(u_long id, int type, char *name, const char *fsname)
{
struct fileusage *fup, **fhp;
int len;
if ((fup = lookup(id, type)) != NULL)
return (fup);
if (name)
len = strlen(name);
else
len = 0;
if ((fup = calloc(1, sizeof(*fup) + len)) == NULL)
errx(1, "calloc failed");
fhp = &fuhead[type][id & (FUHASH - 1)];
fup->fu_next = *fhp;
*fhp = fup;
fup->fu_id = id;
if (name)
bcopy(name, fup->fu_name, len + 1);
else {
(void)sprintf(fup->fu_name, "%lu", id);
if (vflag) {
if (aflag && fsname != NULL)
(void)printf("%s: ", fsname);
printf("unknown %cid: %lu\n",
type == USRQUOTA ? 'u' : 'g', id);
}
}
return (fup);
}
/*
* Special purpose version of ginode used to optimize pass
* over all the inodes in numerical order.
*/
static ino_t nextino, lastinum, lastvalidinum;
static long readcnt, readpercg, fullcnt, inobufsize, partialcnt, partialsize;
static caddr_t inodebuf;
#define INOBUFSIZE 56*1024 /* size of buffer to read inodes */
union dinode *
getnextinode(ino_t inumber)
{
long size;
ufs2_daddr_t dblk;
union dinode *dp;
static caddr_t nextinop;
if (inumber != nextino++ || inumber > lastvalidinum)
errx(1, "bad inode number %ju to nextinode",
(uintmax_t)inumber);
if (inumber >= lastinum) {
readcnt++;
dblk = fsbtodb(&sblock, ino_to_fsba(&sblock, lastinum));
if (readcnt % readpercg == 0) {
size = partialsize;
lastinum += partialcnt;
} else {
size = inobufsize;
lastinum += fullcnt;
}
/*
* If blkread returns an error, it will already have zeroed
* out the buffer, so we do not need to do so here.
*/
blkread(dblk, inodebuf, size);
nextinop = inodebuf;
}
dp = (union dinode *)nextinop;
if (sblock.fs_magic == FS_UFS1_MAGIC)
nextinop += sizeof(struct ufs1_dinode);
else
nextinop += sizeof(struct ufs2_dinode);
return (dp);
}
/*
* Prepare to scan a set of inodes.
*/
void
setinodebuf(ino_t inum)
{
if (inum % sblock.fs_ipg != 0)
errx(1, "bad inode number %ju to setinodebuf", (uintmax_t)inum);
lastvalidinum = inum + sblock.fs_ipg - 1;
nextino = inum;
lastinum = inum;
readcnt = 0;
if (inodebuf != NULL)
return;
inobufsize = blkroundup(&sblock, INOBUFSIZE);
fullcnt = inobufsize / ((sblock.fs_magic == FS_UFS1_MAGIC) ?
sizeof(struct ufs1_dinode) : sizeof(struct ufs2_dinode));
readpercg = sblock.fs_ipg / fullcnt;
partialcnt = sblock.fs_ipg % fullcnt;
partialsize = partialcnt * ((sblock.fs_magic == FS_UFS1_MAGIC) ?
sizeof(struct ufs1_dinode) : sizeof(struct ufs2_dinode));
if (partialcnt != 0) {
readpercg++;
} else {
partialcnt = fullcnt;
partialsize = inobufsize;
}
if ((inodebuf = malloc((unsigned)inobufsize)) == NULL)
errx(1, "cannot allocate space for inode buffer");
}
/*
* Free up data structures used to scan inodes.
*/
void
freeinodebuf(void)
{
if (inodebuf != NULL)
free(inodebuf);
inodebuf = NULL;
}
/*
* Read specified disk blocks.
*/
void
blkread(ufs2_daddr_t bno, char *buf, long cnt)
{
if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0 ||
read(fi, buf, cnt) != cnt)
errx(1, "blkread failed on block %ld", (long)bno);
}
/*
* Display updated block and i-node counts.
*/
void
printchanges(const char *fsname, int type, struct dqblk *dp,
struct fileusage *fup, u_long id)
{
if (!vflag)
return;
if (aflag)
(void)printf("%s: ", fsname);
if (fup->fu_name[0] == '\0')
(void)printf("%-8lu fixed ", id);
else
(void)printf("%-8s fixed ", fup->fu_name);
switch (type) {
case GRPQUOTA:
(void)printf("(group):");
break;
case USRQUOTA:
(void)printf("(user): ");
break;
default:
(void)printf("(unknown quota type %d)", type);
break;
}
if (dp->dqb_curinodes != fup->fu_curinodes)
(void)printf("\tinodes %lu -> %lu", (u_long)dp->dqb_curinodes,
(u_long)fup->fu_curinodes);
if (dp->dqb_curblocks != fup->fu_curblocks)
(void)printf("\tblocks %lu -> %lu",
(u_long)dp->dqb_curblocks,
(u_long)fup->fu_curblocks);
(void)printf("\n");
}
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