/*      $NetBSD: quotaon.c,v 1.31 2022/04/26 15:39:00 hannken Exp $     */

/*
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1990, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)quotaon.c   8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: quotaon.c,v 1.31 2022/04/26 15:39:00 hannken Exp $");
#endif
#endif /* not lint */

/*
 * Turn quota on/off for a filesystem.
 */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/mount.h>

#include <quota.h>
#include <ufs/ufs/quota1.h>

#include <err.h>
#include <fstab.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>


static int      vflag;          /* verbose */

static void usage(void) __dead;
static int quotaonoff(struct fstab *, struct quotahandle *, int, int, int,
    const char *);
static int readonly(struct fstab *, const char *);
static int oneof(const char *target, char *list[], int cnt);

int
main(int argc, char *argv[])
{
        struct fstab *fs;
        struct quotahandle *qh;
        long argnum, done = 0;
        int i, offmode = 0, errs = 0;
        unsigned restrictions;
        int ch;

        int aflag = 0;          /* all file systems */
        int gflag = 0;          /* operate on group quotas */
        int uflag = 0;          /* operate on user quotas */
        int noguflag = 0;       /* operate on both (by default) */

        if (strcmp(getprogname(), "quotaoff") == 0)
                offmode++;
        else if (strcmp(getprogname(), "quotaon") != 0)
                errx(1, "Name must be quotaon or quotaoff");

        while ((ch = getopt(argc, argv, "avug")) != -1) {
                switch(ch) {
                case 'a':
                        aflag++;
                        break;
                case 'g':
                        gflag++;
                        break;
                case 'u':
                        uflag++;
                        break;
                case 'v':
                        vflag++;
                        break;
                default:
                        usage();
                        break;
                }
        }
        argc -= optind;
        argv += optind;

        if (argc <= 0 && !aflag)
                usage();

        if (!gflag && !uflag) {
                noguflag = 1;
        }

        /*
         * XXX at the moment quota_open also uses getfsent(), but it
         * uses it only up front. To avoid conflicting with it, let it
         * initialize first.
         */
        qh = quota_open("/");
        if (qh != NULL) {
                quota_close(qh);
        }

        setfsent();
        while ((fs = getfsent()) != NULL) {
                char buf[MAXPATHLEN];
                const char *fsspec;
                if ((strcmp(fs->fs_vfstype, "ffs") &&
                     strcmp(fs->fs_vfstype, "lfs")) ||
                    strcmp(fs->fs_type, FSTAB_RW))
                        continue;

                fsspec = getfsspecname(buf, sizeof(buf), fs->fs_spec);
                if (fsspec == NULL) {
                        warn("%s", buf);
                        continue;
                }
                if (!aflag) {
                        if ((argnum = oneof(fs->fs_file, argv, argc)) < 0 &&
                            (argnum = oneof(fsspec, argv, argc)) < 0) {
                                continue;
                        }
                        done |= 1U << argnum;
                }

                qh = quota_open(fs->fs_file);
                if (qh == NULL) {
                        if (!aflag) {
                                warn("quota_open");
                                errs++;
                        }
                        continue;
                }

                restrictions = quota_getrestrictions(qh);
                if ((restrictions & QUOTA_RESTRICT_NEEDSQUOTACHECK) == 0) {
                        /* Not a quota v1 volume, skip it */
                        if (!aflag) {
                                errno = EBUSY;
                                warn("%s", fs->fs_file);
                                errs++;
                        }
                        quota_close(qh);
                        continue;
                }

                /*
                 * The idea here is to warn if someone explicitly
                 * tries to turn on group quotas and there are no
                 * group quotas, and likewise for user quotas, but not
                 * to warn if just doing the default thing and one of
                 * the quota types isn't configured.
                 */

                if (noguflag) {
                        errs += quotaonoff(fs, qh, offmode, GRPQUOTA, 0, fsspec);
                        errs += quotaonoff(fs, qh, offmode, USRQUOTA, 0, fsspec);
                }
                if (gflag) {
                        errs += quotaonoff(fs, qh, offmode, GRPQUOTA, 1, fsspec);
                }
                if (uflag) {
                        errs += quotaonoff(fs, qh, offmode, USRQUOTA, 1, fsspec);
                }
                quota_close(qh);
        }
        endfsent();
        for (i = 0; i < argc; i++)
                if ((done & (1U << i)) == 0)
                        warnx("%s not found in fstab", argv[i]);
        return errs;
}

static void
usage(void)
{
        const char *p = getprogname();
        (void) fprintf(stderr, "Usage: %s [-g] [-u] [-v] -a\n"
            "\t%s [-g] [-u] [-v] filesys ...\n", p, p);
        exit(1);
}

static int
quotaonoff(struct fstab *fs, struct quotahandle *qh, int offmode, int idtype,
    int warn_on_enxio, const char *fsspec)
{
        const char *mode = (offmode == 1) ? "off" : "on";
        const char *type;

        if (strcmp(fs->fs_file, "/") && readonly(fs, fsspec)) {
                return 1;
        }

        if (offmode) {
                type = quota_idtype_getname(qh, idtype);
                if (quota_quotaoff(qh, idtype)) {
                        if (warn_on_enxio || errno != ENXIO) {
                                warn("quota%s for %s", mode, fs->fs_file);
                        }
                        return 1;
                }
        } else {
                if (quota_quotaon(qh, idtype)) {
                        if (warn_on_enxio || errno != ENXIO) {
                                warn("quota%s for %s", mode, fs->fs_file);
                        }
                        return 1;
                }
                type = quota_idtype_getname(qh, idtype);
        }

        if (vflag) {
                printf("%s: %s quotas turned %s\n",
                    fs->fs_file, type, mode);
        }
        return 0;
}

/*
 * Verify file system is mounted and not readonly.
 */
static int
readonly(struct fstab *fs, const char *fsspec)
{
        struct statvfs fsbuf;

        if (statvfs(fs->fs_file, &fsbuf) < 0 ||
            strcmp(fsbuf.f_mntonname, fs->fs_file) ||
            strcmp(fsbuf.f_mntfromname, fsspec)) {
                printf("%s: not mounted\n", fs->fs_file);
                return 1;
        }
        if (fsbuf.f_flag & MNT_RDONLY) {
                printf("%s: mounted read-only\n", fs->fs_file);
                return 1;
        }
        return 0;
}

/*
 * Check to see if target appears in list of size cnt.
 */
static int
oneof(const char *target, char *list[], int cnt)
{
        int i;

        for (i = 0; i < cnt; i++)
                if (strcmp(target, list[i]) == 0)
                        return i;
        return -1;
}