/*-
* Copyright (c) 2008 Dag-Erling Coïdan Smørgrav
* Copyright (c) 2008 Marshall Kirk McKusick
* 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
* in this position and unchanged.
* 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/endian.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <ufs/ufs/quota.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <grp.h>
#include <pwd.h>
#include <libutil.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct quotafile {
int fd; /* -1 means using quotactl for access */
int accmode; /* access mode */
int wordsize; /* 32-bit or 64-bit limits */
int quotatype; /* USRQUOTA or GRPQUOTA */
dev_t dev; /* device */
char fsname[MAXPATHLEN + 1]; /* mount point of filesystem */
char qfname[MAXPATHLEN + 1]; /* quota file if not using quotactl */
};
static const char *qfextension[] = INITQFNAMES;
/*
* Check to see if a particular quota is to be enabled.
*/
static int
hasquota(struct fstab *fs, int type, char *qfnamep, int qfbufsize)
{
char *opt;
char *cp;
struct statfs sfb;
char buf[BUFSIZ];
static char initname, usrname[100], grpname[100];
/*
* 1) we only need one of these
* 2) fstab may specify a different filename
*/
if (!initname) {
(void)snprintf(usrname, sizeof(usrname), "%s%s",
qfextension[USRQUOTA], QUOTAFILENAME);
(void)snprintf(grpname, sizeof(grpname), "%s%s",
qfextension[GRPQUOTA], QUOTAFILENAME);
initname = 1;
}
strcpy(buf, fs->fs_mntops);
for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
if ((cp = strchr(opt, '=')))
*cp++ = '\0';
if (type == USRQUOTA && strcmp(opt, usrname) == 0)
break;
if (type == GRPQUOTA && strcmp(opt, grpname) == 0)
break;
}
if (!opt)
return (0);
/*
* Ensure that the filesystem is mounted.
*/
if (statfs(fs->fs_file, &sfb) != 0 ||
strcmp(fs->fs_file, sfb.f_mntonname)) {
return (0);
}
if (cp) {
strncpy(qfnamep, cp, qfbufsize);
} else {
(void)snprintf(qfnamep, qfbufsize, "%s/%s.%s", fs->fs_file,
QUOTAFILENAME, qfextension[type]);
}
return (1);
}
struct quotafile *
quota_open(struct fstab *fs, int quotatype, int openflags)
{
struct quotafile *qf;
struct dqhdr64 dqh;
struct group *grp;
struct stat st;
int qcmd, serrno;
if (strcmp(fs->fs_vfstype, "ufs"))
return (NULL);
if ((qf = calloc(1, sizeof(*qf))) == NULL)
return (NULL);
qf->fd = -1;
qf->quotatype = quotatype;
strncpy(qf->fsname, fs->fs_file, sizeof(qf->fsname));
if (stat(qf->fsname, &st) != 0)
goto error;
qf->dev = st.st_dev;
serrno = hasquota(fs, quotatype, qf->qfname, sizeof(qf->qfname));
qcmd = QCMD(Q_GETQUOTASIZE, quotatype);
if (quotactl(qf->fsname, qcmd, 0, &qf->wordsize) == 0)
return (qf);
if (serrno == 0) {
errno = EOPNOTSUPP;
goto error;
}
qf->accmode = openflags & O_ACCMODE;
if ((qf->fd = open(qf->qfname, qf->accmode|O_CLOEXEC)) < 0 &&
(openflags & O_CREAT) != O_CREAT)
goto error;
/* File open worked, so process it */
if (qf->fd != -1) {
qf->wordsize = 32;
switch (read(qf->fd, &dqh, sizeof(dqh))) {
case -1:
goto error;
case sizeof(dqh):
if (strcmp(dqh.dqh_magic, Q_DQHDR64_MAGIC) != 0) {
/* no magic, assume 32 bits */
qf->wordsize = 32;
return (qf);
}
if (be32toh(dqh.dqh_version) != Q_DQHDR64_VERSION ||
be32toh(dqh.dqh_hdrlen) != sizeof(struct dqhdr64) ||
be32toh(dqh.dqh_reclen) != sizeof(struct dqblk64)) {
/* correct magic, wrong version / lengths */
errno = EINVAL;
goto error;
}
qf->wordsize = 64;
return (qf);
default:
qf->wordsize = 32;
return (qf);
}
/* not reached */
}
/* open failed, but O_CREAT was specified, so create a new file */
if ((qf->fd = open(qf->qfname, O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC, 0)) <
0)
goto error;
qf->wordsize = 64;
memset(&dqh, 0, sizeof(dqh));
memcpy(dqh.dqh_magic, Q_DQHDR64_MAGIC, sizeof(dqh.dqh_magic));
dqh.dqh_version = htobe32(Q_DQHDR64_VERSION);
dqh.dqh_hdrlen = htobe32(sizeof(struct dqhdr64));
dqh.dqh_reclen = htobe32(sizeof(struct dqblk64));
if (write(qf->fd, &dqh, sizeof(dqh)) != sizeof(dqh)) {
/* it was one we created ourselves */
unlink(qf->qfname);
goto error;
}
grp = getgrnam(QUOTAGROUP);
fchown(qf->fd, 0, grp ? grp->gr_gid : 0);
fchmod(qf->fd, 0640);
return (qf);
error:
serrno = errno;
/* did we have an open file? */
if (qf->fd != -1)
close(qf->fd);
free(qf);
errno = serrno;
return (NULL);
}
void
quota_close(struct quotafile *qf)
{
if (qf->fd != -1)
close(qf->fd);
free(qf);
}
int
quota_on(struct quotafile *qf)
{
int qcmd;
qcmd = QCMD(Q_QUOTAON, qf->quotatype);
return (quotactl(qf->fsname, qcmd, 0, qf->qfname));
}
int
quota_off(struct quotafile *qf)
{
return (quotactl(qf->fsname, QCMD(Q_QUOTAOFF, qf->quotatype), 0, 0));
}
const char *
quota_fsname(const struct quotafile *qf)
{
return (qf->fsname);
}
const char *
quota_qfname(const struct quotafile *qf)
{
return (qf->qfname);
}
int
quota_check_path(const struct quotafile *qf, const char *path)
{
struct stat st;
if (stat(path, &st) == -1)
return (-1);
return (st.st_dev == qf->dev);
}
int
quota_maxid(struct quotafile *qf)
{
struct stat st;
int maxid;
if (stat(qf->qfname, &st) < 0)
return (0);
switch (qf->wordsize) {
case 32:
maxid = st.st_size / sizeof(struct dqblk32) - 1;
break;
case 64:
maxid = st.st_size / sizeof(struct dqblk64) - 2;
break;
default:
maxid = 0;
break;
}
return (maxid > 0 ? maxid : 0);
}
static int
quota_read32(struct quotafile *qf, struct dqblk *dqb, int id)
{
struct dqblk32 dqb32;
off_t off;
off = id * sizeof(struct dqblk32);
if (lseek(qf->fd, off, SEEK_SET) == -1)
return (-1);
switch (read(qf->fd, &dqb32, sizeof(dqb32))) {
case 0:
memset(dqb, 0, sizeof(*dqb));
return (0);
case sizeof(dqb32):
dqb->dqb_bhardlimit = dqb32.dqb_bhardlimit;
dqb->dqb_bsoftlimit = dqb32.dqb_bsoftlimit;
dqb->dqb_curblocks = dqb32.dqb_curblocks;
dqb->dqb_ihardlimit = dqb32.dqb_ihardlimit;
dqb->dqb_isoftlimit = dqb32.dqb_isoftlimit;
dqb->dqb_curinodes = dqb32.dqb_curinodes;
dqb->dqb_btime = dqb32.dqb_btime;
dqb->dqb_itime = dqb32.dqb_itime;
return (0);
default:
return (-1);
}
}
static int
quota_read64(struct quotafile *qf, struct dqblk *dqb, int id)
{
struct dqblk64 dqb64;
off_t off;
off = sizeof(struct dqhdr64) + id * sizeof(struct dqblk64);
if (lseek(qf->fd, off, SEEK_SET) == -1)
return (-1);
switch (read(qf->fd, &dqb64, sizeof(dqb64))) {
case 0:
memset(dqb, 0, sizeof(*dqb));
return (0);
case sizeof(dqb64):
dqb->dqb_bhardlimit = be64toh(dqb64.dqb_bhardlimit);
dqb->dqb_bsoftlimit = be64toh(dqb64.dqb_bsoftlimit);
dqb->dqb_curblocks = be64toh(dqb64.dqb_curblocks);
dqb->dqb_ihardlimit = be64toh(dqb64.dqb_ihardlimit);
dqb->dqb_isoftlimit = be64toh(dqb64.dqb_isoftlimit);
dqb->dqb_curinodes = be64toh(dqb64.dqb_curinodes);
dqb->dqb_btime = be64toh(dqb64.dqb_btime);
dqb->dqb_itime = be64toh(dqb64.dqb_itime);
return (0);
default:
return (-1);
}
}
int
quota_read(struct quotafile *qf, struct dqblk *dqb, int id)
{
int qcmd;
if (qf->fd == -1) {
qcmd = QCMD(Q_GETQUOTA, qf->quotatype);
return (quotactl(qf->fsname, qcmd, id, dqb));
}
switch (qf->wordsize) {
case 32:
return (quota_read32(qf, dqb, id));
case 64:
return (quota_read64(qf, dqb, id));
default:
errno = EINVAL;
return (-1);
}
/* not reached */
}
#define CLIP32(u64) ((u64) > UINT32_MAX ? UINT32_MAX : (uint32_t)(u64))
static int
quota_write32(struct quotafile *qf, const struct dqblk *dqb, int id)
{
struct dqblk32 dqb32;
off_t off;
dqb32.dqb_bhardlimit = CLIP32(dqb->dqb_bhardlimit);
dqb32.dqb_bsoftlimit = CLIP32(dqb->dqb_bsoftlimit);
dqb32.dqb_curblocks = CLIP32(dqb->dqb_curblocks);
dqb32.dqb_ihardlimit = CLIP32(dqb->dqb_ihardlimit);
dqb32.dqb_isoftlimit = CLIP32(dqb->dqb_isoftlimit);
dqb32.dqb_curinodes = CLIP32(dqb->dqb_curinodes);
dqb32.dqb_btime = CLIP32(dqb->dqb_btime);
dqb32.dqb_itime = CLIP32(dqb->dqb_itime);
off = id * sizeof(struct dqblk32);
if (lseek(qf->fd, off, SEEK_SET) == -1)
return (-1);
if (write(qf->fd, &dqb32, sizeof(dqb32)) == sizeof(dqb32))
return (0);
return (-1);
}
static int
quota_write64(struct quotafile *qf, const struct dqblk *dqb, int id)
{
struct dqblk64 dqb64;
off_t off;
dqb64.dqb_bhardlimit = htobe64(dqb->dqb_bhardlimit);
dqb64.dqb_bsoftlimit = htobe64(dqb->dqb_bsoftlimit);
dqb64.dqb_curblocks = htobe64(dqb->dqb_curblocks);
dqb64.dqb_ihardlimit = htobe64(dqb->dqb_ihardlimit);
dqb64.dqb_isoftlimit = htobe64(dqb->dqb_isoftlimit);
dqb64.dqb_curinodes = htobe64(dqb->dqb_curinodes);
dqb64.dqb_btime = htobe64(dqb->dqb_btime);
dqb64.dqb_itime = htobe64(dqb->dqb_itime);
off = sizeof(struct dqhdr64) + id * sizeof(struct dqblk64);
if (lseek(qf->fd, off, SEEK_SET) == -1)
return (-1);
if (write(qf->fd, &dqb64, sizeof(dqb64)) == sizeof(dqb64))
return (0);
return (-1);
}
int
quota_write_usage(struct quotafile *qf, struct dqblk *dqb, int id)
{
struct dqblk dqbuf;
int qcmd;
if (qf->fd == -1) {
qcmd = QCMD(Q_SETUSE, qf->quotatype);
return (quotactl(qf->fsname, qcmd, id, dqb));
}
/*
* Have to do read-modify-write of quota in file.
*/
if ((qf->accmode & O_RDWR) != O_RDWR) {
errno = EBADF;
return (-1);
}
if (quota_read(qf, &dqbuf, id) != 0)
return (-1);
/*
* Reset time limit if have a soft limit and were
* previously under it, but are now over it.
*/
if (dqbuf.dqb_bsoftlimit && id != 0 &&
dqbuf.dqb_curblocks < dqbuf.dqb_bsoftlimit &&
dqb->dqb_curblocks >= dqbuf.dqb_bsoftlimit)
dqbuf.dqb_btime = 0;
if (dqbuf.dqb_isoftlimit && id != 0 &&
dqbuf.dqb_curinodes < dqbuf.dqb_isoftlimit &&
dqb->dqb_curinodes >= dqbuf.dqb_isoftlimit)
dqbuf.dqb_itime = 0;
dqbuf.dqb_curinodes = dqb->dqb_curinodes;
dqbuf.dqb_curblocks = dqb->dqb_curblocks;
/*
* Write it back.
*/
switch (qf->wordsize) {
case 32:
return (quota_write32(qf, &dqbuf, id));
case 64:
return (quota_write64(qf, &dqbuf, id));
default:
errno = EINVAL;
return (-1);
}
/* not reached */
}
int
quota_write_limits(struct quotafile *qf, struct dqblk *dqb, int id)
{
struct dqblk dqbuf;
int qcmd;
if (qf->fd == -1) {
qcmd = QCMD(Q_SETQUOTA, qf->quotatype);
return (quotactl(qf->fsname, qcmd, id, dqb));
}
/*
* Have to do read-modify-write of quota in file.
*/
if ((qf->accmode & O_RDWR) != O_RDWR) {
errno = EBADF;
return (-1);
}
if (quota_read(qf, &dqbuf, id) != 0)
return (-1);
/*
* Reset time limit if have a soft limit and were
* previously under it, but are now over it
* or if there previously was no soft limit, but
* now have one and are over it.
*/
if (dqbuf.dqb_bsoftlimit && id != 0 &&
dqbuf.dqb_curblocks < dqbuf.dqb_bsoftlimit &&
dqbuf.dqb_curblocks >= dqb->dqb_bsoftlimit)
dqb->dqb_btime = 0;
if (dqbuf.dqb_bsoftlimit == 0 && id != 0 &&
dqb->dqb_bsoftlimit > 0 &&
dqbuf.dqb_curblocks >= dqb->dqb_bsoftlimit)
dqb->dqb_btime = 0;
if (dqbuf.dqb_isoftlimit && id != 0 &&
dqbuf.dqb_curinodes < dqbuf.dqb_isoftlimit &&
dqbuf.dqb_curinodes >= dqb->dqb_isoftlimit)
dqb->dqb_itime = 0;
if (dqbuf.dqb_isoftlimit == 0 && id !=0 &&
dqb->dqb_isoftlimit > 0 &&
dqbuf.dqb_curinodes >= dqb->dqb_isoftlimit)
dqb->dqb_itime = 0;
dqb->dqb_curinodes = dqbuf.dqb_curinodes;
dqb->dqb_curblocks = dqbuf.dqb_curblocks;
/*
* Write it back.
*/
switch (qf->wordsize) {
case 32:
return (quota_write32(qf, dqb, id));
case 64:
return (quota_write64(qf, dqb, id));
default:
errno = EINVAL;
return (-1);
}
/* not reached */
}
/*
* Convert a quota file from one format to another.
*/
int
quota_convert(struct quotafile *qf, int wordsize)
{
struct quotafile *newqf;
struct dqhdr64 dqh;
struct dqblk dqblk;
struct group *grp;
int serrno, maxid, id, fd;
/*
* Quotas must not be active and quotafile must be open
* for reading and writing.
*/
if ((qf->accmode & O_RDWR) != O_RDWR || qf->fd == -1) {
errno = EBADF;
return (-1);
}
if ((wordsize != 32 && wordsize != 64) ||
wordsize == qf->wordsize) {
errno = EINVAL;
return (-1);
}
maxid = quota_maxid(qf);
if ((newqf = calloc(1, sizeof(*qf))) == NULL) {
errno = ENOMEM;
return (-1);
}
*newqf = *qf;
snprintf(newqf->qfname, MAXPATHLEN + 1, "%s_%d.orig", qf->qfname,
qf->wordsize);
if (rename(qf->qfname, newqf->qfname) < 0) {
free(newqf);
return (-1);
}
if ((newqf->fd = open(qf->qfname, O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC,
0)) < 0) {
serrno = errno;
goto error;
}
newqf->wordsize = wordsize;
if (wordsize == 64) {
memset(&dqh, 0, sizeof(dqh));
memcpy(dqh.dqh_magic, Q_DQHDR64_MAGIC, sizeof(dqh.dqh_magic));
dqh.dqh_version = htobe32(Q_DQHDR64_VERSION);
dqh.dqh_hdrlen = htobe32(sizeof(struct dqhdr64));
dqh.dqh_reclen = htobe32(sizeof(struct dqblk64));
if (write(newqf->fd, &dqh, sizeof(dqh)) != sizeof(dqh)) {
serrno = errno;
goto error;
}
}
grp = getgrnam(QUOTAGROUP);
fchown(newqf->fd, 0, grp ? grp->gr_gid : 0);
fchmod(newqf->fd, 0640);
for (id = 0; id <= maxid; id++) {
if ((quota_read(qf, &dqblk, id)) < 0)
break;
switch (newqf->wordsize) {
case 32:
if ((quota_write32(newqf, &dqblk, id)) < 0)
break;
continue;
case 64:
if ((quota_write64(newqf, &dqblk, id)) < 0)
break;
continue;
default:
errno = EINVAL;
break;
}
}
if (id < maxid) {
serrno = errno;
goto error;
}
/*
* Update the passed in quotafile to reference the new file
* of the converted format size.
*/
fd = qf->fd;
qf->fd = newqf->fd;
newqf->fd = fd;
qf->wordsize = newqf->wordsize;
quota_close(newqf);
return (0);
error:
/* put back the original file */
(void) rename(newqf->qfname, qf->qfname);
quota_close(newqf);
errno = serrno;
return (-1);
}
