/*      $NetBSD: quot.c,v 1.35 2022/11/17 06:40:41 chs Exp $    */

/*
 * Copyright (C) 1991, 1994 Wolfgang Solfrank.
 * Copyright (C) 1991, 1994 TooLs GmbH.
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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
__RCSID("$NetBSD: quot.c,v 1.35 2022/11/17 06:40:41 chs Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/* some flags of what to do: */
static char estimate;
static char count;
static char unused;
static void (*func)(int, struct fs *, const char *);
static long blocksize;
static char *header;

/*
 * Original BSD quot doesn't round to number of frags/blocks,
 * doesn't account for indirection blocks and gets it totally
 * wrong if the size is a multiple of the blocksize.
 * The new code always counts the number of DEV_BSIZE byte blocks
 * instead of the number of kilobytes and converts them to
 * kByte when done (on request).
 */
#ifdef  COMPAT
#define SIZE(n) ((long long)(n))
#else
#define SIZE(n) howmany((long long)(n) * DEV_BSIZE, (long long)blocksize)
#endif

#define INOCNT(fs)      ((fs)->fs_ipg)
#define INOSZ(fs) \
        (((fs)->fs_magic == FS_UFS1_MAGIC ? sizeof(struct ufs1_dinode) : \
        sizeof(struct ufs2_dinode)) * INOCNT(fs))

union dinode {
        struct ufs1_dinode dp1;
        struct ufs2_dinode dp2;
};
#define       DIP(fs, dp, field) \
        (((fs)->fs_magic == FS_UFS1_MAGIC) ? \
        (dp)->dp1.di_##field : (dp)->dp2.di_##field)


static  int             cmpusers(const void *, const void *);
static  void            dofsizes(int, struct fs *, const char *);
static  void            donames(int, struct fs *, const char *);
static  void            douser(int, struct fs *, const char *);
static  union dinode  *get_inode(int, struct fs *, ino_t);
static  void            ffs_oldfscompat(struct fs *);
static  void            initfsizes(void);
static  void            inituser(void);
static  int             isfree(struct fs *, union dinode *);
static  void            quot(const char *, const char *);
static  void            usage(void) __attribute__((__noreturn__));
static  struct user    *user(uid_t);
static  void            uses(uid_t, daddr_t, time_t);
static  void            usrrehash(void);
static  int             virtualblocks(struct fs *, union dinode *);


static union dinode *
get_inode(int fd, struct fs *super, ino_t ino)
{
        static char *ipbuf;
        static ino_t last;
        
        if (fd < 0) {           /* flush cache */
                if (ipbuf) {
                        free(ipbuf);
                        ipbuf = NULL;
                }
                return 0;
        }
        
        if (!ipbuf || ino < last || ino >= last + INOCNT(super)) {
                if (!ipbuf
                    && !(ipbuf = malloc(INOSZ(super))))
                        errx(1, "allocate inodes");
                last = (ino / INOCNT(super)) * INOCNT(super);
                if (lseek(fd,
                    (off_t)ino_to_fsba(super, last) << super->fs_fshift,
                    0) < 0 ||
                    read(fd, ipbuf, INOSZ(super)) != (ssize_t)INOSZ(super))
                        errx(1, "read inodes");
        }

        if (super->fs_magic == FS_UFS1_MAGIC)
                return ((union dinode *)
                    &((struct ufs1_dinode *)ipbuf)[ino % INOCNT(super)]);
        return ((union dinode *)
            &((struct ufs2_dinode *)ipbuf)[ino % INOCNT(super)]);
}

#ifdef  COMPAT
#define actualblocks(fs, dp)    (int)(DIP(fs, dp, blocks) / 2)
#else
#define actualblocks(fs, dp)    (int)(DIP(fs, dp, blocks))
#endif

static int
virtualblocks(struct fs *super, union dinode *dp)
{
        off_t nblk, sz;
        
        sz = DIP(super, dp, size);
#ifdef  COMPAT
        if (ffs_lblkno(super, sz) >= UFS_NDADDR) {
                nblk = ffs_blkroundup(super, sz);
                if (sz == nblk)
                        nblk += super->fs_bsize;
        }
        
        return sz / 1024;
#else   /* COMPAT */
        
        if (ffs_lblkno(super, sz) >= UFS_NDADDR) {
                nblk = ffs_blkroundup(super, sz);
                sz = ffs_lblkno(super, nblk);
                sz = howmany(sz - UFS_NDADDR, FFS_NINDIR(super));
                while (sz > 0) {
                        nblk += sz * super->fs_bsize;
                        /* One block on this level is in the inode itself */
                        sz = howmany(sz - 1, FFS_NINDIR(super));
                }
        } else
                nblk = ffs_fragroundup(super, sz);
        
        return nblk / DEV_BSIZE;
#endif  /* COMPAT */
}

static int
isfree(fs, dp)
        struct fs *fs;
        union dinode *dp;
{
#ifdef  COMPAT
        return (DIP(fs, dp, mode) & IFMT) == 0;
#else   /* COMPAT */
        switch (DIP(fs, dp, mode) & IFMT) {
        case IFIFO:
        case IFLNK:             /* should check FASTSYMLINK? */
        case IFDIR:
        case IFREG:
                return 0;
        default:
                return 1;
        }
#endif
}

static struct user {
        uid_t uid;
        char *name;
        daddr_t space;
        long count;
        daddr_t spc30;
        daddr_t spc60;
        daddr_t spc90;
} *users;
static int nusers;

static void
inituser(void)
{
        int i;
        struct user *usr;
        
        if (!nusers) {
                nusers = 8;
                if (!(users = calloc(nusers, sizeof(*users))))
                        err(1, "allocate users");
        } else {
                for (usr = users, i = nusers; --i >= 0; usr++) {
                        usr->space = usr->spc30 = usr->spc60 = usr->spc90 = 0;
                        usr->count = 0;
                }
        }
}

static void
usrrehash(void)
{
        int i;
        struct user *usr, *usrn;
        struct user *svusr;
        
        svusr = users;
        nusers <<= 1;
        if (!(users = calloc(nusers, sizeof(*users))))
                err(1, "allocate users");
        for (usr = svusr, i = nusers >> 1; --i >= 0; usr++) {
                for (usrn = users + (usr->uid&(nusers - 1));
                     usrn->name;
                     usrn--) {
                        if (usrn <= users)
                                usrn = users + nusers;
                }
                *usrn = *usr;
        }
}

static struct user *
user(uid_t uid)
{
        struct user *usr;
        int i;
        struct passwd *pwd;
        
        for (;;) {
                for (usr = users + (uid & (nusers - 1)), i = nusers;
                     --i >= 0;
                     usr--) {
                        if (!usr->name) {
                                usr->uid = uid;
                                
                                if (!(pwd = getpwuid(uid)))
                                        asprintf(&usr->name, "#%u", uid);
                                else
                                        asprintf(&usr->name, "%s",
                                            pwd->pw_name);
                                if (!usr->name)
                                        errx(1, "allocate users");
                                return usr;
                        } else if (usr->uid == uid)
                                return usr;

                        if (usr <= users)
                                usr = users + nusers;
                }
                usrrehash();
        }
}

static int
cmpusers(u1, u2)
        const void *u1, *u2;
{
        return ((const struct user *)u2)->space - ((const struct user *)u1)->space;
}

#define sortusers(users)        (qsort((users), nusers, sizeof(struct user), \
                                       cmpusers))

static void
uses(uid, blks, act)
        uid_t uid;
        daddr_t blks;
        time_t act;
{
        static time_t today;
        struct user *usr;
        
        if (!today)
                time(&today);
        
        usr = user(uid);
        usr->count++;
        usr->space += blks;
        
        if (today - act > 90L * 24L * 60L * 60L)
                usr->spc90 += blks;
        if (today - act > 60L * 24L * 60L * 60L)
                usr->spc60 += blks;
        if (today - act > 30L * 24L * 60L * 60L)
                usr->spc30 += blks;
}

#ifdef  COMPAT
#define FSZCNT  500
#else
#define FSZCNT  512
#endif
struct fsizes {
        struct fsizes *fsz_next;
        daddr_t fsz_first, fsz_last;
        ino_t fsz_count[FSZCNT];
        daddr_t fsz_sz[FSZCNT];
} *fsizes;

static void
initfsizes()
{
        struct fsizes *fp;
        int i;
        
        for (fp = fsizes; fp; fp = fp->fsz_next) {
                for (i = FSZCNT; --i >= 0;) {
                        fp->fsz_count[i] = 0;
                        fp->fsz_sz[i] = 0;
                }
        }
}

static void
dofsizes(int fd, struct fs *super, const char *name)
{
        ino_t inode, maxino;
        union dinode *dp;
        daddr_t sz, ksz;
        struct fsizes *fp, **fsp;
        int i;
        
        maxino = super->fs_ncg * super->fs_ipg - 1;
#ifdef  COMPAT
        if (!(fsizes = malloc(sizeof(*fsizes))))
                err(1, "alloc fsize structure");
#endif  /* COMPAT */
        for (inode = 0; inode < maxino; inode++) {
                errno = 0;
                if ((dp = get_inode(fd, super, inode))
#ifdef  COMPAT
                    && ((DIP(super, dp, mode) & IFMT) == IFREG
                        || (DIP(dp, mode) & IFMT) == IFDIR)
#else   /* COMPAT */
                    && !isfree(super, dp)
#endif  /* COMPAT */
                    ) {
                        sz = estimate ? virtualblocks(super, dp) :
                            actualblocks(super, dp);
#ifdef  COMPAT
                        if (sz >= FSZCNT) {
                                fsizes->fsz_count[FSZCNT-1]++;
                                fsizes->fsz_sz[FSZCNT-1] += sz;
                        } else {
                                fsizes->fsz_count[sz]++;
                                fsizes->fsz_sz[sz] += sz;
                        }
#else   /* COMPAT */
                        ksz = SIZE(sz);
                        for (fsp = &fsizes; (fp = *fsp) != NULL;
                            fsp = &fp->fsz_next) {
                                if (ksz < fp->fsz_last)
                                        break;
                        }
                        if (!fp || ksz < fp->fsz_first) {
                                if (!(fp = malloc(sizeof(*fp))))
                                        err(1, "alloc fsize structure");
                                fp->fsz_next = *fsp;
                                *fsp = fp;
                                fp->fsz_first = (ksz / FSZCNT) * FSZCNT;
                                fp->fsz_last = fp->fsz_first + FSZCNT;
                                for (i = FSZCNT; --i >= 0;) {
                                        fp->fsz_count[i] = 0;
                                        fp->fsz_sz[i] = 0;
                                }
                        }
                        fp->fsz_count[ksz % FSZCNT]++;
                        fp->fsz_sz[ksz % FSZCNT] += sz;
#endif  /* COMPAT */
                } else if (errno)
                        errx(1, "%s", name);
        }
        sz = 0;
        for (fp = fsizes; fp; fp = fp->fsz_next) {
                for (i = 0; i < FSZCNT; i++) {
                        if (fp->fsz_count[i])
                                printf("%ld\t%ld\t%lld\n",
                                    (long)(fp->fsz_first + i),
                                    (long)fp->fsz_count[i],
                                    SIZE(sz += fp->fsz_sz[i]));
                }
        }
}

static void
douser(int fd, struct fs *super, const char *name)
{
        ino_t inode, maxino;
        struct user *usr, *usrs;
        union dinode *dp;
        int n;
        
        maxino = super->fs_ncg * super->fs_ipg - 1;
        for (inode = 0; inode < maxino; inode++) {
                errno = 0;
                if ((dp = get_inode(fd, super, inode))
                    && !isfree(super, dp))
                        uses(DIP(super, dp, uid),
                            estimate ? virtualblocks(super, dp) :
                            actualblocks(super, dp), DIP(super, dp, atime));
                else if (errno)
                        errx(1, "%s", name);
        }
        if (!(usrs = calloc(nusers, sizeof(*usrs))))
                errx(1, "allocate users");
        memmove(usrs, users, nusers * sizeof(*usrs));
        sortusers(usrs);
        for (usr = usrs, n = nusers; --n >= 0 && usr->count; usr++) {
                printf("%5lld", SIZE(usr->space));
                if (count)
                        printf("\t%5ld", usr->count);
                printf("\t%-8s", usr->name);
                if (unused)
                        printf("\t%5lld\t%5lld\t%5lld",
                            SIZE(usr->spc30), SIZE(usr->spc60),
                            SIZE(usr->spc90));
                printf("\n");
        }
        free(usrs);
}

static void
donames(int fd, struct fs *super, const char *name)
{
        int c;
        ino_t inode;
#ifdef COMPAT
        ino_t inode1 = -1;
#endif
        ino_t maxino;
        union dinode *dp;
        
        maxino = super->fs_ncg * super->fs_ipg - 1;
        /* first skip the name of the filesystem */
        while ((c = getchar()) != EOF && (c < '0' || c > '9'))
                while ((c = getchar()) != EOF && c != '\n');
        ungetc(c, stdin);
        while (scanf("%" SCNu64, &inode) == 1) {
                if (inode > maxino) {
#ifndef COMPAT
                        warnx("invalid inode %" PRIu64, inode);
#endif
                        return;
                }
#ifdef  COMPAT
                if (inode < inode1)
                        continue;
#endif
                errno = 0;
                if ((dp = get_inode(fd, super, inode))
                    && !isfree(super, dp)) {
                        printf("%s\t", user(DIP(super, dp, uid))->name);
                        /* now skip whitespace */
                        while ((c = getchar()) == ' ' || c == '\t');
                        /* and print out the remainder of the input line */
                        while (c != EOF && c != '\n') {
                                putchar(c);
                                c = getchar();
                        }
                        putchar('\n');
#ifdef COMPAT
                        inode1 = inode;
#endif
                } else {
                        if (errno)
                                errx(1, "%s", name);
                        /* skip this line */
                        while ((c = getchar()) != EOF && c != '\n')
                                continue;
                }
                if (c == EOF)
                        break;
        }
}

static void
usage(void)
{
        const char *p = getprogname();
#ifdef  COMPAT
        fprintf(stderr, "Usage: %s [-nfcvha] [<filesystem> ...]\n", p);
#else   /* COMPAT */
        fprintf(stderr, "Usage: %s [ -acfhknv ] [<filesystem> ... ]\n", p);
#endif  /* COMPAT */
        exit(1);
}

/*
 * Sanity checks for old file systems.
 * Stolen from <sys/lib/libsa/ufs.c>
 */
static void
ffs_oldfscompat(struct fs *fs)
{
        int i;

        if (fs->fs_magic == FS_UFS1_MAGIC &&
            fs->fs_old_inodefmt < FS_44INODEFMT) {
                quad_t sizepb = fs->fs_bsize;

                fs->fs_maxfilesize = fs->fs_bsize * UFS_NDADDR - 1;
                for (i = 0; i < UFS_NIADDR; i++) {
                        sizepb *= FFS_NINDIR(fs);
                        fs->fs_maxfilesize += sizepb;
                }
                fs->fs_qbmask = ~fs->fs_bmask;
                fs->fs_qfmask = ~fs->fs_fmask;
        }
}

/*
 * Possible superblock locations ordered from most to least likely.
 */
static int sblock_try[] = SBLOCKSEARCH;
static char superblock[SBLOCKSIZE];


static void
quot(const char *name, const char *mp)
{
        int fd, i;
        struct fs *fs;
        int sbloc;
        
        get_inode(-1, 0, 0);            /* flush cache */
        inituser();
        initfsizes();
        if ((fd = open(name, 0)) < 0) {
                warn("%s", name);
                return;
        }

        for (i = 0; ; i++) {
                sbloc = sblock_try[i];
                if (sbloc == -1) {
                        warnx("%s: not a BSD filesystem", name);
                        close(fd);
                        return;
                }
                if (pread(fd, superblock, SBLOCKSIZE, sbloc) != SBLOCKSIZE)
                        continue;
                fs = (struct fs *)superblock;

                if (fs->fs_magic != FS_UFS1_MAGIC &&
                    fs->fs_magic != FS_UFS2_MAGIC &&
                    fs->fs_magic != FS_UFS2EA_MAGIC)
                        continue;

                if (fs->fs_magic == FS_UFS2_MAGIC
                    || fs->fs_magic == FS_UFS2EA_MAGIC
                    || fs->fs_old_flags & FS_FLAGS_UPDATED) {
                        /* Not the main superblock */
                        if (fs->fs_sblockloc != sbloc)
                                continue;
                } else {
                        /* might be a first alt. id blocksize 64k */
                        if (sbloc == SBLOCK_UFS2)
                                continue;
                }

                if (fs->fs_bsize > MAXBSIZE ||
                    (size_t)fs->fs_bsize < sizeof(struct fs))
                        continue;
                break;
        }

        ffs_oldfscompat((struct fs *)superblock);
        printf("%s:", name);
        if (mp)
                printf(" (%s)", mp);
        putchar('\n');
        (*func)(fd, fs, name);
        close(fd);
}

int
main(int argc, char **argv)
{
        char all = 0;
        struct statvfs *mp;
        char dev[MNAMELEN + 1];
        char *nm;
        int cnt;
        
        func = douser;
#ifndef COMPAT
        header = getbsize(NULL, &blocksize);
#endif
        while (--argc > 0 && **++argv == '-') {
                while (*++*argv) {
                        switch (**argv) {
                        case 'n':
                                func = donames;
                                break;
                        case 'c':
                                func = dofsizes;
                                break;
                        case 'a':
                                all = 1;
                                break;
                        case 'f':
                                count = 1;
                                break;
                        case 'h':
                                estimate = 1;
                                break;
#ifndef COMPAT
                        case 'k':
                                blocksize = 1024;
                                break;
#endif  /* COMPAT */
                        case 'v':
                                unused = 1;
                                break;
                        default:
                                usage();
                        }
                }
        }
        if (all) {
                cnt = getmntinfo(&mp, MNT_NOWAIT);
                for (; --cnt >= 0; mp++) {
                        if (!strncmp(mp->f_fstypename, MOUNT_FFS,
                            sizeof(mp->f_fstypename))) {
                                if ((nm =
                                    strrchr(mp->f_mntfromname, '/')) != NULL) {
                                        snprintf(dev, sizeof(dev), "/dev/r%s",
                                            nm + 1);
                                        nm = dev;
                                } else
                                        nm = mp->f_mntfromname;
                                quot(nm, mp->f_mntonname);
                        }
                }
        }
        while (--argc >= 0)
                quot(*argv++, 0);
        return 0;
}