2009-01-30 13:54:03 +00:00
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/*-
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* Copyright (c) 2008 Dag-Erling Coïdan Smørgrav
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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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* in this position and unchanged.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/endian.h>
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#include <sys/stat.h>
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#include <ufs/ufs/quota.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <pwd.h>
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#include <libutil.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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struct quotafile {
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int fd;
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int type; /* 32 or 64 */
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};
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struct quotafile *
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quota_open(const char *fn)
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{
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struct quotafile *qf;
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struct dqhdr64 dqh;
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int serrno;
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if ((qf = calloc(1, sizeof(*qf))) == NULL)
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return (NULL);
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if ((qf->fd = open(fn, O_RDWR)) < 0) {
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serrno = errno;
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free(qf);
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errno = serrno;
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return (NULL);
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}
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qf->type = 32;
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switch (read(qf->fd, &dqh, sizeof(dqh))) {
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case -1:
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serrno = errno;
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close(qf->fd);
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free(qf);
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errno = serrno;
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return (NULL);
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case sizeof(dqh):
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if (strcmp(dqh.dqh_magic, Q_DQHDR64_MAGIC) != 0) {
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/* no magic, assume 32 bits */
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qf->type = 32;
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return (qf);
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}
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if (be32toh(dqh.dqh_version) != Q_DQHDR64_VERSION ||
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be32toh(dqh.dqh_hdrlen) != sizeof(struct dqhdr64) ||
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be32toh(dqh.dqh_reclen) != sizeof(struct dqblk64)) {
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/* correct magic, wrong version / lengths */
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close(qf->fd);
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free(qf);
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errno = EINVAL;
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return (NULL);
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}
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qf->type = 64;
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return (qf);
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default:
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qf->type = 32;
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return (qf);
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}
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/* not reached */
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}
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struct quotafile *
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quota_create(const char *fn)
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{
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struct quotafile *qf;
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struct dqhdr64 dqh;
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struct group *grp;
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int serrno;
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if ((qf = calloc(1, sizeof(*qf))) == NULL)
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return (NULL);
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if ((qf->fd = open(fn, O_RDWR|O_CREAT|O_TRUNC, 0)) < 0) {
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serrno = errno;
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free(qf);
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errno = serrno;
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return (NULL);
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}
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qf->type = 64;
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memset(&dqh, 0, sizeof(dqh));
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memcpy(dqh.dqh_magic, Q_DQHDR64_MAGIC, sizeof(dqh.dqh_magic));
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dqh.dqh_version = htobe32(Q_DQHDR64_VERSION);
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dqh.dqh_hdrlen = htobe32(sizeof(struct dqhdr64));
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dqh.dqh_reclen = htobe32(sizeof(struct dqblk64));
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if (write(qf->fd, &dqh, sizeof(dqh)) != sizeof(dqh)) {
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serrno = errno;
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unlink(fn);
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close(qf->fd);
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free(qf);
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errno = serrno;
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return (NULL);
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}
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grp = getgrnam(QUOTAGROUP);
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fchown(qf->fd, 0, grp ? grp->gr_gid : 0);
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fchmod(qf->fd, 0640);
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return (qf);
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}
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void
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quota_close(struct quotafile *qf)
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{
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close(qf->fd);
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free(qf);
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}
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static int
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quota_read32(struct quotafile *qf, struct dqblk *dqb, int id)
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{
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struct dqblk32 dqb32;
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off_t off;
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off = id * sizeof(struct dqblk32);
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if (lseek(qf->fd, off, SEEK_SET) == -1)
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return (-1);
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switch (read(qf->fd, &dqb32, sizeof(dqb32))) {
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case 0:
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memset(&dqb, 0, sizeof(*dqb));
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return (0);
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case sizeof(dqb32):
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dqb->dqb_bhardlimit = dqb32.dqb_bhardlimit;
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dqb->dqb_bsoftlimit = dqb32.dqb_bsoftlimit;
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dqb->dqb_curblocks = dqb32.dqb_curblocks;
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dqb->dqb_ihardlimit = dqb32.dqb_ihardlimit;
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dqb->dqb_isoftlimit = dqb32.dqb_isoftlimit;
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dqb->dqb_curinodes = dqb32.dqb_curinodes;
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dqb->dqb_btime = dqb32.dqb_btime;
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dqb->dqb_itime = dqb32.dqb_itime;
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return (0);
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default:
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return (-1);
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}
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}
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static int
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quota_read64(struct quotafile *qf, struct dqblk *dqb, int id)
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{
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struct dqblk64 dqb64;
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off_t off;
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off = sizeof(struct dqhdr64) + id * sizeof(struct dqblk64);
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if (lseek(qf->fd, off, SEEK_SET) == -1)
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return (-1);
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switch (read(qf->fd, &dqb64, sizeof(dqb64))) {
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case 0:
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memset(&dqb, 0, sizeof(*dqb));
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return (0);
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case sizeof(dqb64):
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dqb->dqb_bhardlimit = be64toh(dqb64.dqb_bhardlimit);
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dqb->dqb_bsoftlimit = be64toh(dqb64.dqb_bsoftlimit);
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dqb->dqb_curblocks = be64toh(dqb64.dqb_curblocks);
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dqb->dqb_ihardlimit = be64toh(dqb64.dqb_ihardlimit);
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dqb->dqb_isoftlimit = be64toh(dqb64.dqb_isoftlimit);
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dqb->dqb_curinodes = be64toh(dqb64.dqb_curinodes);
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dqb->dqb_btime = be64toh(dqb64.dqb_btime);
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dqb->dqb_itime = be64toh(dqb64.dqb_itime);
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return (0);
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default:
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return (-1);
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}
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}
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int
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quota_read(struct quotafile *qf, struct dqblk *dqb, int id)
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{
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switch (qf->type) {
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case 32:
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return quota_read32(qf, dqb, id);
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case 64:
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return quota_read64(qf, dqb, id);
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default:
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errno = EINVAL;
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return (-1);
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}
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/* not reached */
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}
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#define CLIP32(u64) ((u64) > UINT32_MAX ? UINT32_MAX : (uint32_t)(u64))
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static int
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quota_write32(struct quotafile *qf, const struct dqblk *dqb, int id)
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{
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struct dqblk32 dqb32;
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off_t off;
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dqb32.dqb_bhardlimit = CLIP32(dqb->dqb_bhardlimit);
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dqb32.dqb_bsoftlimit = CLIP32(dqb->dqb_bsoftlimit);
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dqb32.dqb_curblocks = CLIP32(dqb->dqb_curblocks);
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dqb32.dqb_ihardlimit = CLIP32(dqb->dqb_ihardlimit);
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dqb32.dqb_isoftlimit = CLIP32(dqb->dqb_isoftlimit);
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dqb32.dqb_curinodes = CLIP32(dqb->dqb_curinodes);
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dqb32.dqb_btime = CLIP32(dqb->dqb_btime);
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dqb32.dqb_itime = CLIP32(dqb->dqb_itime);
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off = id * sizeof(struct dqblk32);
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if (lseek(qf->fd, off, SEEK_SET) == -1)
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return (-1);
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2009-02-10 08:11:44 +00:00
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return (write(qf->fd, &dqb32, sizeof(dqb32)) == -1);
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2009-01-30 13:54:03 +00:00
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}
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static int
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quota_write64(struct quotafile *qf, const struct dqblk *dqb, int id)
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{
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struct dqblk64 dqb64;
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off_t off;
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dqb64.dqb_bhardlimit = htobe64(dqb->dqb_bhardlimit);
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dqb64.dqb_bsoftlimit = htobe64(dqb->dqb_bsoftlimit);
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dqb64.dqb_curblocks = htobe64(dqb->dqb_curblocks);
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dqb64.dqb_ihardlimit = htobe64(dqb->dqb_ihardlimit);
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dqb64.dqb_isoftlimit = htobe64(dqb->dqb_isoftlimit);
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dqb64.dqb_curinodes = htobe64(dqb->dqb_curinodes);
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dqb64.dqb_btime = htobe64(dqb->dqb_btime);
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dqb64.dqb_itime = htobe64(dqb->dqb_itime);
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off = sizeof(struct dqhdr64) + id * sizeof(struct dqblk64);
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if (lseek(qf->fd, off, SEEK_SET) == -1)
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return (-1);
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2009-02-10 08:11:44 +00:00
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return (write(qf->fd, &dqb64, sizeof(dqb64)) == -1);
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2009-01-30 13:54:03 +00:00
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}
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int
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quota_write(struct quotafile *qf, const struct dqblk *dqb, int id)
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{
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switch (qf->type) {
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case 32:
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return quota_write32(qf, dqb, id);
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case 64:
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return quota_write64(qf, dqb, id);
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default:
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errno = EINVAL;
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return (-1);
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}
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/* not reached */
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}
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