/*
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

/*
 * Disk quota reporting program.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/socket.h>

#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/rquota.h>

#include <ufs/ufs/quota.h>

#include <ctype.h>
#include <err.h>
#include <fstab.h>
#include <grp.h>
#include <libutil.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

static const char *qfextension[] = INITQFNAMES;

struct quotause {
        struct  quotause *next;
        long    flags;
        struct  dqblk dqblk;
        char    fsname[MAXPATHLEN + 1];
};

static char *timeprt(int64_t seconds);
static struct quotause *getprivs(long id, int quotatype);
static void usage(void) __dead2;
static int showuid(u_long uid);
static int showgid(u_long gid);
static int showusrname(char *name);
static int showgrpname(char *name);
static int showquotas(int type, u_long id, const char *name);
static void showrawquotas(int type, u_long id, struct quotause *qup);
static void heading(int type, u_long id, const char *name, const char *tag);
static int getufsquota(struct fstab *fs, struct quotause *qup, long id,
        int quotatype);
static int getnfsquota(struct statfs *fst, struct quotause *qup, long id,
        int quotatype);
static enum clnt_stat callaurpc(char *host, int prognum, int versnum, int procnum, 
        xdrproc_t inproc, char *in, xdrproc_t outproc, char *out);
static int alldigits(char *s);

static int      hflag;
static int      lflag;
static int      rflag;
static int      qflag;
static int      vflag;
static char     *filename = NULL;

int
main(int argc, char *argv[])
{
        int ngroups;
        int i, ch, gflag = 0, uflag = 0, errflag = 0;

        while ((ch = getopt(argc, argv, "f:ghlrquv")) != -1) {
                switch(ch) {
                case 'f':
                        filename = optarg;
                        break;
                case 'g':
                        gflag++;
                        break;
                case 'h':
                        hflag++;
                        break;
                case 'l':
                        lflag++;
                        break;
                case 'q':
                        qflag++;
                        break;
                case 'r':
                        rflag++;
                        break;
                case 'u':
                        uflag++;
                        break;
                case 'v':
                        vflag++;
                        break;
                default:
                        usage();
                }
        }
        argc -= optind;
        argv += optind;
        if (!uflag && !gflag)
                uflag++;
        if (argc == 0) {
                if (uflag)
                        errflag += showuid(getuid());
                if (gflag) {
                        gid_t mygid, myegid, gidset[NGROUPS_MAX];

                        mygid = getgid();
                        errflag += showgid(mygid);
                        myegid = getegid();
                        errflag += showgid(myegid);
                        ngroups = getgroups(NGROUPS_MAX, gidset);
                        if (ngroups < 0)
                                err(1, "getgroups");
                        for (i = 0; i < ngroups; i++)
                                if (gidset[i] != mygid)
                                        errflag += showgid(gidset[i]);
                }
                return(errflag);
        }
        if (uflag && gflag)
                usage();
        if (uflag) {
                for (; argc > 0; argc--, argv++) {
                        if (alldigits(*argv))
                                errflag += showuid(atoi(*argv));
                        else
                                errflag += showusrname(*argv);
                }
                return(errflag);
        }
        if (gflag) {
                for (; argc > 0; argc--, argv++) {
                        if (alldigits(*argv))
                                errflag += showgid(atoi(*argv));
                        else
                                errflag += showgrpname(*argv);
                }
        }
        return(errflag);
}

static void
usage(void)
{

        fprintf(stderr, "%s\n%s\n%s\n",
            "usage: quota [-ghlu] [-f path] [-v | -q | -r]",
            "       quota [-hlu] [-f path] [-v | -q | -r] user ...",
            "       quota -g [-hl] [-f path] [-v | -q | -r] group ...");
        exit(1);
}

/*
 * Print out quotas for a specified user identifier.
 */
static int
showuid(u_long uid)
{
        struct passwd *pwd = getpwuid(uid);
        const char *name;

        if (pwd == NULL)
                name = "(no account)";
        else
                name = pwd->pw_name;
        return(showquotas(USRQUOTA, uid, name));
}

/*
 * Print out quotas for a specified user name.
 */
static int
showusrname(char *name)
{
        struct passwd *pwd = getpwnam(name);

        if (pwd == NULL) {
                warnx("%s: unknown user", name);
                return(1);
        }
        return(showquotas(USRQUOTA, pwd->pw_uid, name));
}

/*
 * Print out quotas for a specified group identifier.
 */
static int
showgid(u_long gid)
{
        struct group *grp = getgrgid(gid);
        const char *name;

        if (grp == NULL)
                name = "(no entry)";
        else
                name = grp->gr_name;
        return(showquotas(GRPQUOTA, gid, name));
}

/*
 * Print out quotas for a specified group name.
 */
static int
showgrpname(char *name)
{
        struct group *grp = getgrnam(name);

        if (grp == NULL) {
                warnx("%s: unknown group", name);
                return(1);
        }
        return(showquotas(GRPQUOTA, grp->gr_gid, name));
}

static void
prthumanval(int len, u_int64_t bytes)
{
        char buf[len + 1];

        /*
         * Limit the width to 5 bytes as that is what users expect.
         */
        humanize_number(buf, MIN(sizeof(buf), 5), bytes, "",
                        HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);

        (void)printf(" %*s", len, buf);
}

static int
showquotas(int type, u_long id, const char *name)
{
        struct quotause *qup;
        struct quotause *quplist;
        const char *msgi, *msgb;
        const char *nam;
        char *bgrace = NULL, *igrace = NULL;
        int lines = 0, overquota = 0;
        static time_t now;

        if (now == 0)
                time(&now);
        quplist = getprivs(id, type);
        for (qup = quplist; qup; qup = qup->next) {
                msgi = NULL;
                if (qup->dqblk.dqb_ihardlimit &&
                    qup->dqblk.dqb_curinodes >= qup->dqblk.dqb_ihardlimit) {
                        overquota++;
                        msgi = "File limit reached on";
                }
                else if (qup->dqblk.dqb_isoftlimit &&
                    qup->dqblk.dqb_curinodes >= qup->dqblk.dqb_isoftlimit) {
                        overquota++;
                        if (qup->dqblk.dqb_itime > now)
                                msgi = "In file grace period on";
                        else
                                msgi = "Over file quota on";
                }
                msgb = NULL;
                if (qup->dqblk.dqb_bhardlimit &&
                    qup->dqblk.dqb_curblocks >= qup->dqblk.dqb_bhardlimit) {
                        overquota++;
                        msgb = "Block limit reached on";
                }
                else if (qup->dqblk.dqb_bsoftlimit &&
                    qup->dqblk.dqb_curblocks >= qup->dqblk.dqb_bsoftlimit) {
                        overquota++;
                        if (qup->dqblk.dqb_btime > now)
                                msgb = "In block grace period on";
                        else
                                msgb = "Over block quota on";
                }
                if (rflag) {
                        showrawquotas(type, id, qup);
                        continue;
                }
                if (!vflag &&
                    qup->dqblk.dqb_isoftlimit == 0 &&
                    qup->dqblk.dqb_ihardlimit == 0 &&
                    qup->dqblk.dqb_bsoftlimit == 0 &&
                    qup->dqblk.dqb_bhardlimit == 0)
                        continue;
                if (qflag) {
                        if ((msgi != NULL || msgb != NULL) &&
                            lines++ == 0)
                                heading(type, id, name, "");
                        if (msgi != NULL)
                                printf("\t%s %s\n", msgi, qup->fsname);
                        if (msgb != NULL)
                                printf("\t%s %s\n", msgb, qup->fsname);
                        continue;
                }
                if (!vflag &&
                    qup->dqblk.dqb_curblocks == 0 &&
                    qup->dqblk.dqb_curinodes == 0)
                        continue;
                if (lines++ == 0)
                        heading(type, id, name, "");
                nam = qup->fsname;
                if (strlen(qup->fsname) > 15) {
                        printf("%s\n", qup->fsname);
                        nam = "";
                } 
                printf("%-15s", nam);
                if (hflag) {
                        prthumanval(7, dbtob(qup->dqblk.dqb_curblocks));
                        printf("%c", (msgb == NULL) ? ' ' : '*');
                        prthumanval(7, dbtob(qup->dqblk.dqb_bsoftlimit));
                        prthumanval(7, dbtob(qup->dqblk.dqb_bhardlimit));
                } else {
                        printf(" %7ju%c %7ju %7ju",
                            (uintmax_t)dbtob(qup->dqblk.dqb_curblocks)
                                / 1024,
                            (msgb == NULL) ? ' ' : '*',
                            (uintmax_t)dbtob(qup->dqblk.dqb_bsoftlimit)
                                / 1024,
                            (uintmax_t)dbtob(qup->dqblk.dqb_bhardlimit)
                                / 1024);
                }
                if (msgb != NULL)
                        bgrace = timeprt(qup->dqblk.dqb_btime);
                if (msgi != NULL)
                        igrace = timeprt(qup->dqblk.dqb_itime);
                printf("%8s %6ju%c %6ju %6ju%8s\n"
                        , (msgb == NULL) ? "" : bgrace
                        , (uintmax_t)qup->dqblk.dqb_curinodes
                        , (msgi == NULL) ? ' ' : '*'
                        , (uintmax_t)qup->dqblk.dqb_isoftlimit
                        , (uintmax_t)qup->dqblk.dqb_ihardlimit
                        , (msgi == NULL) ? "" : igrace
                );
                if (msgb != NULL)
                        free(bgrace);
                if (msgi != NULL)
                        free(igrace);
        }
        if (!qflag && !rflag && lines == 0)
                heading(type, id, name, "none");
        return (overquota);
}

static void
showrawquotas(int type, u_long id, struct quotause *qup)
{
        time_t t;

        printf("Raw %s quota information for id %lu on %s\n",
            type == USRQUOTA ? "user" : "group", id, qup->fsname);
        printf("block hard limit:     %ju\n",
            (uintmax_t)qup->dqblk.dqb_bhardlimit);
        printf("block soft limit:     %ju\n",
            (uintmax_t)qup->dqblk.dqb_bsoftlimit);
        printf("current block count:  %ju\n",
            (uintmax_t)qup->dqblk.dqb_curblocks);
        printf("i-node hard limit:    %ju\n",
            (uintmax_t)qup->dqblk.dqb_ihardlimit);
        printf("i-node soft limit:    %ju\n",
            (uintmax_t)qup->dqblk.dqb_isoftlimit);
        printf("current i-node count: %ju\n",
            (uintmax_t)qup->dqblk.dqb_curinodes);
        printf("block grace time:     %jd",
            (intmax_t)qup->dqblk.dqb_btime);
        if (qup->dqblk.dqb_btime != 0) {
                t = qup->dqblk.dqb_btime;
                printf(" %s", ctime(&t));
        } else {
                printf("\n");
        }
        printf("i-node grace time:    %jd", (intmax_t)qup->dqblk.dqb_itime);
        if (qup->dqblk.dqb_itime != 0) {
                t = qup->dqblk.dqb_itime;
                printf(" %s", ctime(&t));
        } else {
                printf("\n");
        }
}


static void
heading(int type, u_long id, const char *name, const char *tag)
{

        printf("Disk quotas for %s %s (%cid %lu): %s\n", qfextension[type],
            name, *qfextension[type], id, tag);
        if (!qflag && tag[0] == '\0') {
                printf("%-15s %7s %8s %7s %7s %6s %7s %6s%8s\n"
                        , "Filesystem"
                        , "usage"
                        , "quota"
                        , "limit"
                        , "grace"
                        , "files"
                        , "quota"
                        , "limit"
                        , "grace"
                );
        }
}

/*
 * Calculate the grace period and return a printable string for it.
 */
static char *
timeprt(int64_t seconds)
{
        time_t hours, minutes;
        char *buf;
        static time_t now;

        if (now == 0)
                time(&now);
        if (now > seconds) {
                if ((buf = strdup("none")) == NULL)
                        errx(1, "strdup() failed in timeprt()");
                return (buf);
        }
        seconds -= now;
        minutes = (seconds + 30) / 60;
        hours = (minutes + 30) / 60;
        if (hours >= 36) {
                if (asprintf(&buf, "%lddays", ((long)hours + 12) / 24) < 0)
                        errx(1, "asprintf() failed in timeprt(1)");
                return (buf);
        }
        if (minutes >= 60) {
                if (asprintf(&buf, "%2ld:%ld", (long)minutes / 60,
                    (long)minutes % 60) < 0)
                        errx(1, "asprintf() failed in timeprt(2)");
                return (buf);
        }
        if (asprintf(&buf, "%2ld", (long)minutes) < 0)
                errx(1, "asprintf() failed in timeprt(3)");
        return (buf);
}

/*
 * Collect the requested quota information.
 */
static struct quotause *
getprivs(long id, int quotatype)
{
        struct quotause *qup, *quptail = NULL;
        struct fstab *fs;
        struct quotause *quphead;
        struct statfs *fst;
        int nfst, i;
        struct statfs sfb;

        qup = quphead = (struct quotause *)0;

        if (filename != NULL && statfs(filename, &sfb) != 0)
                err(1, "cannot statfs %s", filename);
        nfst = getmntinfo(&fst, MNT_NOWAIT);
        if (nfst == 0)
                errx(2, "no filesystems mounted!");
        setfsent();
        for (i = 0; i < nfst; i++) {
                if (qup == NULL) {
                        if ((qup = (struct quotause *)malloc(sizeof *qup))
                            == NULL)
                                errx(2, "out of memory");
                }
                /*
                 * See if the user requested a specific file system
                 * or specified a file inside a mounted file system.
                 */
                if (filename != NULL &&
                    strcmp(sfb.f_mntonname, fst[i].f_mntonname) != 0)
                        continue;
                if (strcmp(fst[i].f_fstypename, "nfs") == 0) {
                        if (lflag)
                                continue;
                        if (getnfsquota(&fst[i], qup, id, quotatype) == 0)
                                continue;
                } else if (strcmp(fst[i].f_fstypename, "ufs") == 0) {
                        /*
                         * XXX
                         * UFS filesystems must be in /etc/fstab, and must
                         * indicate that they have quotas on (?!) This is quite
                         * unlike SunOS where quotas can be enabled/disabled
                         * on a filesystem independent of /etc/fstab, and it
                         * will still print quotas for them.
                         */
                        if ((fs = getfsspec(fst[i].f_mntfromname)) == NULL)
                                continue;
                        if (getufsquota(fs, qup, id, quotatype) == 0)
                                continue;
                } else
                        continue;
                strcpy(qup->fsname, fst[i].f_mntonname);
                if (quphead == NULL)
                        quphead = qup;
                else
                        quptail->next = qup;
                quptail = qup;
                quptail->next = 0;
                qup = NULL;
        }
        if (qup)
                free(qup);
        endfsent();
        return (quphead);
}

/*
 * Check to see if a particular quota is available.
 */
static int
getufsquota(struct fstab *fs, struct quotause *qup, long id, int quotatype)
{
        struct quotafile *qf;

        if ((qf = quota_open(fs, quotatype, O_RDONLY)) == NULL)
                return (0);
        if (quota_read(qf, &qup->dqblk, id) != 0)
                return (0);
        quota_close(qf);
        return (1);
}

static int
getnfsquota(struct statfs *fst, struct quotause *qup, long id, int quotatype)
{
        struct ext_getquota_args gq_args;
        struct getquota_args old_gq_args;
        struct getquota_rslt gq_rslt;
        struct dqblk *dqp = &qup->dqblk;
        struct timeval tv;
        char *cp, host[NI_MAXHOST];
        enum clnt_stat call_stat;

        if (fst->f_flags & MNT_LOCAL)
                return (0);

        /*
         * must be some form of "hostname:/path"
         */
        cp = fst->f_mntfromname;
        do {
                cp = strrchr(cp, ':');
        } while (cp != NULL && *(cp + 1) != '/');
        if (cp == NULL) {
                warnx("cannot find hostname for %s", fst->f_mntfromname);
                return (0);
        }
        memset(host, 0, sizeof(host));
        memcpy(host, fst->f_mntfromname, cp - fst->f_mntfromname);
        host[sizeof(host) - 1] = '\0';
 
        /* Avoid attempting the RPC for special amd(8) filesystems. */
        if (strncmp(fst->f_mntfromname, "pid", 3) == 0 &&
            strchr(fst->f_mntfromname, '@') != NULL)
                return (0);

        gq_args.gqa_pathp = cp + 1;
        gq_args.gqa_id = id;
        gq_args.gqa_type = quotatype;

        call_stat = callaurpc(host, RQUOTAPROG, EXT_RQUOTAVERS,
                              RQUOTAPROC_GETQUOTA, (xdrproc_t)xdr_ext_getquota_args, (char *)&gq_args,
                              (xdrproc_t)xdr_getquota_rslt, (char *)&gq_rslt);
        if (call_stat == RPC_PROGVERSMISMATCH || call_stat == RPC_PROGNOTREGISTERED) {
                if (quotatype == USRQUOTA) {
                        old_gq_args.gqa_pathp = cp + 1;
                        old_gq_args.gqa_uid = id;
                        call_stat = callaurpc(host, RQUOTAPROG, RQUOTAVERS,
                                              RQUOTAPROC_GETQUOTA, (xdrproc_t)xdr_getquota_args, (char *)&old_gq_args,
                                              (xdrproc_t)xdr_getquota_rslt, (char *)&gq_rslt);
                } else {
                        /* Old rpc quota does not support group type */
                        return (0);
                }
        }
        if (call_stat != 0)
                return (call_stat);

        switch (gq_rslt.status) {
        case Q_NOQUOTA:
                break;
        case Q_EPERM:
                warnx("quota permission error, host: %s",
                        fst->f_mntfromname);
                break;
        case Q_OK:
                gettimeofday(&tv, NULL);
                        /* blocks*/
                dqp->dqb_bhardlimit =
                    ((uint64_t)gq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit *
                    gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize) / DEV_BSIZE;
                dqp->dqb_bsoftlimit =
                    ((uint64_t)gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit *
                    gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize) / DEV_BSIZE;
                dqp->dqb_curblocks =
                    ((uint64_t)gq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks *
                    gq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize) / DEV_BSIZE;
                        /* inodes */
                dqp->dqb_ihardlimit =
                        gq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit;
                dqp->dqb_isoftlimit =
                        gq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit;
                dqp->dqb_curinodes =
                        gq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles;
                        /* grace times */
                dqp->dqb_btime =
                    tv.tv_sec + gq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft;
                dqp->dqb_itime =
                    tv.tv_sec + gq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft;
                return (1);
        default:
                warnx("bad rpc result, host: %s", fst->f_mntfromname);
                break;
        }

        return (0);
}
 
static enum clnt_stat
callaurpc(char *host, int prognum, int versnum, int procnum,
    xdrproc_t inproc, char *in, xdrproc_t outproc, char *out)
{
        enum clnt_stat clnt_stat;
        struct timeval timeout, tottimeout;
 
        CLIENT *client = NULL;

        client = clnt_create(host, prognum, versnum, "udp");
        if (client == NULL)
                return ((int)rpc_createerr.cf_stat);
        timeout.tv_usec = 0;
        timeout.tv_sec = 6;
        CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);

        client->cl_auth = authunix_create_default();
        tottimeout.tv_sec = 25;
        tottimeout.tv_usec = 0;
        clnt_stat = clnt_call(client, procnum, inproc, in,
            outproc, out, tottimeout);
        return (clnt_stat);
}

static int
alldigits(char *s)
{
        int c;

        c = *s++;
        do {
                if (!isdigit(c))
                        return (0);
        } while ((c = *s++));
        return (1);
}