/*
 * 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.
 */

/*
 * Quota report
 */
#include <sys/param.h>  /* dbtob */
#include <sys/stat.h>
#include <ufs/ufs/quota.h>
#include <fstab.h>
#include <pwd.h>
#include <grp.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>

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

struct fileusage {
        struct  fileusage *fu_next;
        struct  dqblk fu_dqblk;
        uid_t   fu_id;
        char    fu_name[1];
        /* actually bigger */
};
#define FUHASH 1024     /* must be power of two */
struct fileusage *fuhead[MAXQUOTAS][FUHASH];
struct fileusage *lookup(uid_t, int);
struct fileusage *addid(uid_t id, int type, char *name);
uid_t highid[MAXQUOTAS];        /* highest addid()'ed identifier per type */

int     vflag;                  /* verbose */
int     aflag;                  /* all file systems */

void    usage(void);
int     repquota(struct fstab *, int, char *);
int     hasquota(struct fstab *, int, char **);
int     oneof(char *, char *[], int);
char    *timeprt(time_t);
int
main(int argc, char *argv[])
{
        struct fstab *fs;
        struct passwd *pw;
        struct group *gr;
        int gflag = 0, uflag = 0, errs = 0;
        long i, argnum, done = 0;
        char *qfnp;
        int ch;

        while ((ch = getopt(argc, argv, "aguv")) != -1) {
                switch(ch) {
                case 'a':
                        aflag++;
                        break;
                case 'g':
                        gflag++;
                        break;
                case 'u':
                        uflag++;
                        break;
                case 'v':
                        vflag++;
                        break;
                default:
                        usage();
                }
        }
        argc -= optind;
        argv += optind;
        if ((argc == 0) == (aflag == 0))
                usage();
        if (!gflag && !uflag) {
                if (aflag)
                        gflag++;
                uflag++;
        }
        if (gflag) {
                setgrent();
                while ((gr = getgrent()) != 0)
                        (void) addid((uid_t)gr->gr_gid, GRPQUOTA, gr->gr_name);
                endgrent();
        }
        if (uflag) {
                setpwent();
                while ((pw = getpwent()) != 0)
                        (void) addid(pw->pw_uid, USRQUOTA, pw->pw_name);
                endpwent();
        }
        setfsent();
        while ((fs = getfsent()) != NULL) {
                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))
                                errs += repquota(fs, GRPQUOTA, qfnp);
                        if (uflag && hasquota(fs, USRQUOTA, &qfnp))
                                errs += repquota(fs, 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))
                                errs += repquota(fs, GRPQUOTA, qfnp);
                        if (uflag && hasquota(fs, USRQUOTA, &qfnp))
                                errs += repquota(fs, 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(void)
{
        extern char *__progname;
        fprintf(stderr, "usage: %s [-aguv] filesystem ...\n", __progname);
        exit(1);
}

int
repquota(struct fstab *fs, int type, char *qfpathname)
{
        struct fileusage *fup;
        FILE *qf;
        uid_t id;
        struct dqblk dqbuf;
        char *timeprt(time_t);
        static struct dqblk zerodqblk;
        static int warned = 0;
        static int multiple = 0;

        if (quotactl(fs->fs_file, QCMD(Q_SYNC, type), 0, 0) < 0 &&
            errno == EOPNOTSUPP && !warned && vflag) {
                warned++;
                fprintf(stdout,
                    "*** Warning: Quotas are not compiled into this kernel\n");
        }
        if (multiple++)
                printf("\n");
        if (vflag)
                fprintf(stdout, "*** Report for %s quotas on %s (%s)\n",
                    qfextension[type], fs->fs_file, fs->fs_spec);
        if ((qf = fopen(qfpathname, "r")) == NULL) {
                perror(qfpathname);
                return (1);
        }
        for (id = 0; ; id++) {
                fread(&dqbuf, sizeof(struct dqblk), 1, qf);
                if (feof(qf))
                        break;
                if (dqbuf.dqb_curinodes == 0 && dqbuf.dqb_curblocks == 0)
                        continue;
                if ((fup = lookup(id, type)) == 0)
                        fup = addid(id, type, NULL);
                fup->fu_dqblk = dqbuf;
        }
        fclose(qf);
        printf("                        KByte limits               File limits\n");
        printf("User            used    soft    hard  grace    used  soft  hard  grace\n");
        for (id = 0; id <= highid[type]; id++) {
                fup = lookup(id, type);
                if (fup == 0)
                        continue;
                if (fup->fu_dqblk.dqb_curinodes == 0 &&
                    fup->fu_dqblk.dqb_curblocks == 0)
                        continue;
                printf("%-10s", fup->fu_name);
                printf("%c%c %7d %7d %7d %6s",
                        fup->fu_dqblk.dqb_bsoftlimit && 
                            fup->fu_dqblk.dqb_curblocks >= 
                            fup->fu_dqblk.dqb_bsoftlimit ? '+' : '-',
                        fup->fu_dqblk.dqb_isoftlimit &&
                            fup->fu_dqblk.dqb_curinodes >=
                            fup->fu_dqblk.dqb_isoftlimit ? '+' : '-',
                        (int)(dbtob((u_quad_t)fup->fu_dqblk.dqb_curblocks)
                            / 1024),
                        (int)(dbtob((u_quad_t)fup->fu_dqblk.dqb_bsoftlimit)
                            / 1024),
                        (int)(dbtob((u_quad_t)fup->fu_dqblk.dqb_bhardlimit)
                            / 1024),
                        fup->fu_dqblk.dqb_bsoftlimit && 
                            fup->fu_dqblk.dqb_curblocks >= 
                            fup->fu_dqblk.dqb_bsoftlimit ?
                            timeprt(fup->fu_dqblk.dqb_btime) : "");
                printf("  %6d %5d %5d %6s\n",
                        fup->fu_dqblk.dqb_curinodes,
                        fup->fu_dqblk.dqb_isoftlimit,
                        fup->fu_dqblk.dqb_ihardlimit,
                        fup->fu_dqblk.dqb_isoftlimit &&
                            fup->fu_dqblk.dqb_curinodes >=
                            fup->fu_dqblk.dqb_isoftlimit ?
                            timeprt(fup->fu_dqblk.dqb_itime) : "");
                fup->fu_dqblk = zerodqblk;
        }
        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)
{
        char *opt;
        char *cp;
        static char initname, usrname[100], grpname[100];
        static char buf[BUFSIZ];

        if (!initname) {
                (void)snprintf(usrname, sizeof usrname, "%s%s",
                    qfextension[USRQUOTA], qfname);
                (void)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, '=')))
                        *cp++ = '\0';
                if (type == USRQUOTA && strcmp(opt, usrname) == 0)
                        break;
                if (type == GRPQUOTA && strcmp(opt, grpname) == 0)
                        break;
        }
        if (!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);
}

/*
 * Routines to manage the file usage table.
 *
 * Lookup an id of a specific type.
 */
struct fileusage *
lookup(uid_t id, int type)
{
        struct fileusage *fup;

        for (fup = fuhead[type][id & (FUHASH-1)]; fup != 0; fup = fup->fu_next)
                if (fup->fu_id == id)
                        return (fup);
        return (NULL);
}

/*
 * Add a new file usage id if it does not already exist.
 */
struct fileusage *
addid(uid_t id, int type, char *name)
{
        struct fileusage *fup, **fhp;
        size_t len;

        if ((fup = lookup(id, type)))
                return (fup);
        if (name)
                len = strlen(name);
        else
                len = 10;
        if ((fup = calloc(1, sizeof(*fup) + len)) == NULL) {
                fprintf(stderr, "out of memory for fileusage structures\n");
                exit(1);
        }
        fhp = &fuhead[type][id & (FUHASH - 1)];
        fup->fu_next = *fhp;
        *fhp = fup;
        fup->fu_id = id;
        if (id > highid[type])
                highid[type] = id;
        if (name) {
                bcopy(name, fup->fu_name, len + 1);
        } else {
                snprintf(fup->fu_name, len, "%u", id);
        }
        return (fup);
}

/*
 * Calculate the grace period and return a printable string for it.
 */
char *
timeprt(time_t seconds)
{
        int hours, minutes;
        static char buf[20];
        static time_t now;

        if (now == 0)
                time(&now);
        if (now > seconds)
                return ("none");
        seconds -= now;
        minutes = (seconds + 30) / 60;
        hours = (minutes + 30) / 60;
        if (hours >= 36) {
                snprintf(buf, sizeof buf, "%ddays", (hours + 12) / 24);
                return (buf);
        }
        if (minutes >= 60) {
                snprintf(buf, sizeof buf, "%2d:%d", minutes / 60,
                    minutes % 60);
                return (buf);
        }
        snprintf(buf, sizeof buf, "%2d", minutes);
        return (buf);
}