/*
 * 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.
 */

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

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

char *qfname = QUOTAFILENAME;
char *qfextension[] = INITQFNAMES;

int     aflag;          /* all file systems */
int     gflag;          /* operate on group quotas */
int     uflag;          /* operate on user quotas */
int     vflag;          /* verbose */

void    usage(char *whoami);
int     hasquota(struct fstab *fs, int type, char **qfnamep, int force);
int     quotaonoff(struct fstab *fs, int offmode, int type, char *qfpathname);
int     oneof(char *target, char *list[], int cnt);
int     readonly(struct fstab *fs);


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

        whoami = strrchr(*argv, '/') + 1;
        if (whoami == (char *)1)
                whoami = *argv;
        if (strcmp(whoami, "quotaoff") == 0)
                offmode = 1;
        else if (strcmp(whoami, "quotaon") != 0) {
                fprintf(stderr, "Name must be quotaon or quotaoff not %s\n",
                        whoami);
                exit(1);
        }
        while ((ch = getopt(argc, argv, "avug")) != -1) {
                switch (ch) {
                case 'a':
                        aflag = 1;
                        break;
                case 'g':
                        gflag = 1;
                        break;
                case 'u':
                        uflag = 1;
                        break;
                case 'v':
                        vflag = 1;
                        break;
                default:
                        usage(whoami);
                }
        }
        argc -= optind;
        argv += optind;
        if (argc <= 0 && !aflag)
                usage(whoami);
        if (!gflag && !uflag) {
                gflag = 1;
                uflag = 1;
        }
        setfsent();
        while ((fs = getfsent()) != NULL) {
                if (strcmp(fs->fs_type, FSTAB_RW))
                        continue;
                if (strcmp(fs->fs_vfstype, "ffs") &&
                    strcmp(fs->fs_vfstype, "ufs") &&
                    strcmp(fs->fs_vfstype, "mfs"))
                        continue;
                if (aflag) {
                        if (gflag && hasquota(fs, GRPQUOTA, &qfnp, 0))
                                errs += quotaonoff(fs, offmode, GRPQUOTA, qfnp);
                        if (uflag && hasquota(fs, USRQUOTA, &qfnp, 0))
                                errs += quotaonoff(fs, offmode, USRQUOTA, qfnp);
                        continue;
                }
                if ((argnum = oneof(fs->fs_file, argv, argc)) >= 0 ||
                    (argnum = oneof(fs->fs_spec, argv, argc)) >= 0) {
                        done |= 1 << argnum;
                        if (gflag) {
                                hasquota(fs, GRPQUOTA, &qfnp, 1);
                                errs += quotaonoff(fs, offmode, GRPQUOTA, qfnp);
                        }
                        if (uflag) {
                                hasquota(fs, USRQUOTA, &qfnp, 1);
                                errs += quotaonoff(fs, offmode, USRQUOTA, qfnp);
                        }
                }
        }
        endfsent();
        for (i = 0; i < argc; i++)
                if ((done & (1 << i)) == 0)
                        fprintf(stderr, "%s not found in fstab\n",
                                argv[i]);
        exit(errs);
}

void
usage(char *whoami)
{

        fprintf(stderr, "usage: %s [-aguv] filesystem ...\n", whoami);
        exit(1);
}

int
quotaonoff(struct fstab *fs, int offmode, int type, char *qfpathname)
{
        if (strcmp(fs->fs_file, "/") && readonly(fs))
                return (1);
        if (offmode) {
                if (quotactl(fs->fs_file, QCMD(Q_QUOTAOFF, type), 0, 0) < 0) {
                        fprintf(stderr, "quotaoff: ");
                        perror(fs->fs_file);
                        return (1);
                }
                if (vflag)
                        printf("%s: %s quotas turned off\n", fs->fs_file,
                            qfextension[type]);
                return (0);
        }
        if (quotactl(fs->fs_file, QCMD(Q_QUOTAON, type), 0, qfpathname) < 0) {
                warn("%s: %s quotas using %s", fs->fs_file,
                    qfextension[type], qfpathname);
                return (1);
        }
        if (vflag)
                printf("%s: %s quotas turned on\n", fs->fs_file,
                    qfextension[type]);
        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);
}

/*
 * Check to see if a particular quota is to be enabled.
 */
int
hasquota(struct fstab *fs, int type, char **qfnamep, int force)
{
        char *opt;
        char *cp;
        static char initname, usrname[100], grpname[100];
        static char buf[BUFSIZ];

        if (!initname) {
                snprintf(usrname, sizeof usrname, "%s%s",
                    qfextension[USRQUOTA], qfname);
                snprintf(grpname, sizeof grpname, "%s%s",
                    qfextension[GRPQUOTA], qfname);
                initname = 1;
        }
        strlcpy(buf, fs->fs_mntops, sizeof buf);
        for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
                if ((cp = strchr(opt, '=')) != NULL)
                        *cp++ = '\0';
                if (type == USRQUOTA && strcmp(opt, usrname) == 0)
                        break;
                if (type == GRPQUOTA && strcmp(opt, grpname) == 0)
                        break;
        }
        if (!force && !opt)
                return (0);
        if (cp) {
                *qfnamep = cp;
                return (1);
        }
        (void) snprintf(buf, sizeof buf, "%s/%s.%s", fs->fs_file,
            qfname, qfextension[type]);
        *qfnamep = buf;
        return (1);
}

/*
 * Verify file system is mounted and not readonly.
 * MFS is special -- it puts "mfs:" in the kernel's mount table
 */
int
readonly(struct fstab *fs)
{
        struct statfs fsbuf;

        if (statfs(fs->fs_file, &fsbuf) < 0 ||
            strcmp(fsbuf.f_mntonname, fs->fs_file) ||
            strcmp(fsbuf.f_mntfromname, fs->fs_spec)) {
                if (strcmp(fs->fs_file, "mfs") ||
                    memcmp(fsbuf.f_mntfromname, "mfs:", sizeof("mfs:")-1))
                        ;
                else {
                        printf("%s: not mounted\n", fs->fs_file);
                        return (1);
                }
        }
        if (fsbuf.f_flags & MNT_RDONLY) {
                printf("%s: mounted read-only\n", fs->fs_file);
                return (1);
        }
        return (0);
}