596 lines
15 KiB
C
596 lines
15 KiB
C
/*-
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* Copyright (c) 2008 Dag-Erling Coïdan Smørgrav
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* Copyright (c) 2008 Marshall Kirk McKusick
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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/mount.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 <fstab.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 <stdio.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; /* -1 means using quotactl for access */
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int accmode; /* access mode */
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int wordsize; /* 32-bit or 64-bit limits */
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int quotatype; /* USRQUOTA or GRPQUOTA */
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dev_t dev; /* device */
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char fsname[MAXPATHLEN + 1]; /* mount point of filesystem */
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char qfname[MAXPATHLEN + 1]; /* quota file if not using quotactl */
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};
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static const char *qfextension[] = INITQFNAMES;
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/*
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* Check to see if a particular quota is to be enabled.
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*/
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static int
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hasquota(struct fstab *fs, int type, char *qfnamep, int qfbufsize)
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{
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char *opt;
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char *cp;
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struct statfs sfb;
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char buf[BUFSIZ];
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static char initname, usrname[100], grpname[100];
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/*
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* 1) we only need one of these
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* 2) fstab may specify a different filename
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*/
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if (!initname) {
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(void)snprintf(usrname, sizeof(usrname), "%s%s",
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qfextension[USRQUOTA], QUOTAFILENAME);
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(void)snprintf(grpname, sizeof(grpname), "%s%s",
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qfextension[GRPQUOTA], QUOTAFILENAME);
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initname = 1;
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}
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strcpy(buf, fs->fs_mntops);
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for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
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if ((cp = strchr(opt, '=')))
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*cp++ = '\0';
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if (type == USRQUOTA && strcmp(opt, usrname) == 0)
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break;
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if (type == GRPQUOTA && strcmp(opt, grpname) == 0)
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break;
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}
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if (!opt)
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return (0);
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/*
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* Ensure that the filesystem is mounted.
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*/
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if (statfs(fs->fs_file, &sfb) != 0 ||
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strcmp(fs->fs_file, sfb.f_mntonname)) {
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return (0);
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}
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if (cp) {
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strncpy(qfnamep, cp, qfbufsize);
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} else {
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(void)snprintf(qfnamep, qfbufsize, "%s/%s.%s", fs->fs_file,
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QUOTAFILENAME, qfextension[type]);
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}
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return (1);
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}
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struct quotafile *
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quota_open(struct fstab *fs, int quotatype, int openflags)
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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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struct stat st;
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int qcmd, serrno;
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if (strcmp(fs->fs_vfstype, "ufs"))
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return (NULL);
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if ((qf = calloc(1, sizeof(*qf))) == NULL)
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return (NULL);
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qf->fd = -1;
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qf->quotatype = quotatype;
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strlcpy(qf->fsname, fs->fs_file, sizeof(qf->fsname));
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if (stat(qf->fsname, &st) != 0)
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goto error;
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qf->dev = st.st_dev;
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serrno = hasquota(fs, quotatype, qf->qfname, sizeof(qf->qfname));
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qcmd = QCMD(Q_GETQUOTASIZE, quotatype);
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if (quotactl(qf->fsname, qcmd, 0, &qf->wordsize) == 0)
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return (qf);
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if (serrno == 0) {
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errno = EOPNOTSUPP;
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goto error;
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}
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qf->accmode = openflags & O_ACCMODE;
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if ((qf->fd = open(qf->qfname, qf->accmode|O_CLOEXEC)) < 0 &&
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(openflags & O_CREAT) != O_CREAT)
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goto error;
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/* File open worked, so process it */
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if (qf->fd != -1) {
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qf->wordsize = 32;
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switch (read(qf->fd, &dqh, sizeof(dqh))) {
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case -1:
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goto error;
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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->wordsize = 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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errno = EINVAL;
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goto error;
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}
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qf->wordsize = 64;
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return (qf);
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default:
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qf->wordsize = 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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/* open failed, but O_CREAT was specified, so create a new file */
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if ((qf->fd = open(qf->qfname, O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC, 0)) <
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0)
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goto error;
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qf->wordsize = 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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/* it was one we created ourselves */
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unlink(qf->qfname);
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goto error;
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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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error:
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serrno = errno;
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/* did we have an open file? */
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if (qf->fd != -1)
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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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void
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quota_close(struct quotafile *qf)
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{
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if (qf->fd != -1)
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close(qf->fd);
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free(qf);
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}
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int
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quota_on(struct quotafile *qf)
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{
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int qcmd;
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qcmd = QCMD(Q_QUOTAON, qf->quotatype);
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return (quotactl(qf->fsname, qcmd, 0, qf->qfname));
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}
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int
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quota_off(struct quotafile *qf)
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{
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return (quotactl(qf->fsname, QCMD(Q_QUOTAOFF, qf->quotatype), 0, 0));
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}
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const char *
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quota_fsname(const struct quotafile *qf)
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{
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return (qf->fsname);
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}
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const char *
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quota_qfname(const struct quotafile *qf)
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{
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return (qf->qfname);
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}
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int
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quota_check_path(const struct quotafile *qf, const char *path)
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{
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struct stat st;
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if (stat(path, &st) == -1)
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return (-1);
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return (st.st_dev == qf->dev);
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}
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int
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quota_maxid(struct quotafile *qf)
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{
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struct stat st;
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int maxid;
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if (stat(qf->qfname, &st) < 0)
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return (0);
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switch (qf->wordsize) {
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case 32:
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maxid = st.st_size / sizeof(struct dqblk32) - 1;
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break;
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case 64:
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maxid = st.st_size / sizeof(struct dqblk64) - 2;
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break;
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default:
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maxid = 0;
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break;
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}
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return (maxid > 0 ? maxid : 0);
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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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int qcmd;
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if (qf->fd == -1) {
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qcmd = QCMD(Q_GETQUOTA, qf->quotatype);
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return (quotactl(qf->fsname, qcmd, id, dqb));
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}
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switch (qf->wordsize) {
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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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if (write(qf->fd, &dqb32, sizeof(dqb32)) == sizeof(dqb32))
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return (0);
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return (-1);
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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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if (write(qf->fd, &dqb64, sizeof(dqb64)) == sizeof(dqb64))
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return (0);
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return (-1);
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}
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int
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quota_write_usage(struct quotafile *qf, struct dqblk *dqb, int id)
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{
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struct dqblk dqbuf;
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int qcmd;
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if (qf->fd == -1) {
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qcmd = QCMD(Q_SETUSE, qf->quotatype);
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return (quotactl(qf->fsname, qcmd, id, dqb));
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}
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/*
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* Have to do read-modify-write of quota in file.
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*/
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if ((qf->accmode & O_RDWR) != O_RDWR) {
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errno = EBADF;
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return (-1);
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}
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if (quota_read(qf, &dqbuf, id) != 0)
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return (-1);
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/*
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* Reset time limit if have a soft limit and were
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* previously under it, but are now over it.
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*/
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if (dqbuf.dqb_bsoftlimit && id != 0 &&
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dqbuf.dqb_curblocks < dqbuf.dqb_bsoftlimit &&
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dqb->dqb_curblocks >= dqbuf.dqb_bsoftlimit)
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dqbuf.dqb_btime = 0;
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if (dqbuf.dqb_isoftlimit && id != 0 &&
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dqbuf.dqb_curinodes < dqbuf.dqb_isoftlimit &&
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dqb->dqb_curinodes >= dqbuf.dqb_isoftlimit)
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dqbuf.dqb_itime = 0;
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dqbuf.dqb_curinodes = dqb->dqb_curinodes;
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dqbuf.dqb_curblocks = dqb->dqb_curblocks;
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/*
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* Write it back.
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*/
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switch (qf->wordsize) {
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case 32:
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return (quota_write32(qf, &dqbuf, id));
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case 64:
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return (quota_write64(qf, &dqbuf, 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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int
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quota_write_limits(struct quotafile *qf, struct dqblk *dqb, int id)
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{
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struct dqblk dqbuf;
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int qcmd;
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if (qf->fd == -1) {
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qcmd = QCMD(Q_SETQUOTA, qf->quotatype);
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return (quotactl(qf->fsname, qcmd, id, dqb));
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}
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/*
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* Have to do read-modify-write of quota in file.
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*/
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if ((qf->accmode & O_RDWR) != O_RDWR) {
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errno = EBADF;
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return (-1);
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}
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if (quota_read(qf, &dqbuf, id) != 0)
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return (-1);
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/*
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* Reset time limit if have a soft limit and were
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* previously under it, but are now over it
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* or if there previously was no soft limit, but
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* now have one and are over it.
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*/
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if (dqbuf.dqb_bsoftlimit && id != 0 &&
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dqbuf.dqb_curblocks < dqbuf.dqb_bsoftlimit &&
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dqbuf.dqb_curblocks >= dqb->dqb_bsoftlimit)
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dqb->dqb_btime = 0;
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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);
|
|
}
|