/*
 * 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.
 *
 * $FreeBSD: src/usr.sbin/quot/quot.c,v 1.11.2.4 2002/03/15 18:12:41 mikeh Exp $
 */

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/time.h>

#include <vfs/ufs/dinode.h>
#include <vfs/ufs/inode.h>
#include <vfs/ufs/fs.h>
#include <vfs/ufs/quota.h>

#include <err.h>
#include <fcntl.h>
#include <fstab.h>
#include <errno.h>
#include <inttypes.h>
#include <paths.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 *, char *);
static long blocksize;
static char *header;
static int headerlen;

static struct ufs1_dinode *get_inode(int, struct fs *, ino_t);
static int      virtualblocks(struct fs *, struct ufs1_dinode *);
static int      isfree(struct ufs1_dinode *);
static void     inituser(void);
static void     usrrehash(void);
static struct user *user(uid_t);
static int      cmpusers(const void *, const void *);
static void     uses(uid_t, daddr_t, time_t);
static void     initfsizes(void);
static void     dofsizes(int, struct fs *, char *);
static void     douser(int, struct fs *, char *);
static void     donames(int, struct fs *, char *);
static void     usage(void);
static void     quot(char *, char *);

/*
 * 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 512 byte blocks
 * instead of the number of kilobytes and converts them to
 * kByte when done (on request).
 *
 * Due to the size of modern disks, we must cast intermediate
 * values to 64 bits to prevent potential overflows.
 */
#ifdef  COMPAT
#define SIZE(n) (n)
#else
#define SIZE(n) ((int)(((quad_t)(n) * 512 + blocksize - 1)/blocksize))
#endif

#define INOCNT(fs)      ((fs)->fs_ipg)
#define INOSZ(fs)       (sizeof(struct ufs1_dinode) * INOCNT(fs))

static struct ufs1_dinode *
get_inode(int fd, struct fs *super, ino_t ino)
{
        static struct ufs1_dinode *ip;
        static ino_t last;
        
        if (fd < 0) {           /* flush cache */
                if (ip) {
                        free(ip);
                        ip = NULL;
                }
                return 0;
        }
        
        if (!ip || ino < last || ino >= last + INOCNT(super)) {
                if (!ip
                    && !(ip = (struct ufs1_dinode *)malloc(INOSZ(super))))
                        errx(1, "allocate inodes");
                last = rounddown(ino, INOCNT(super));
                if (lseek(fd, (off_t)ino_to_fsba(super, last) << super->fs_fshift, 0) < (off_t)0
                    || read(fd,ip,INOSZ(super)) != (ssize_t)INOSZ(super))
                        err(1, "read inodes");
        }
        
        return ip + ino % INOCNT(super);
}

#ifdef  COMPAT
#define actualblocks(super,ip)  ((ip)->di_blocks/2)
#else
#define actualblocks(super,ip)  ((ip)->di_blocks)
#endif

static int
virtualblocks(struct fs *super, struct ufs1_dinode *ip)
{
        off_t nblk, sz;
        
        sz = ip->di_size;
#ifdef  COMPAT
        if (lblkno(super,sz) >= UFS_NDADDR) {
                nblk = blkroundup(super,sz);
                if (sz == nblk)
                        nblk += super->fs_bsize;
        }
        
        return sz / 1024;
        
#else   /* COMPAT */
        
        if (lblkno(super,sz) >= UFS_NDADDR) {
                nblk = blkroundup(super,sz);
                sz = lblkno(super,nblk);
                sz = (sz - UFS_NDADDR + NINDIR(super) - 1) / NINDIR(super);
                while (sz > 0) {
                        nblk += sz * super->fs_bsize;
                        /* sz - 1 rounded up */
                        sz = (sz - 1 + NINDIR(super) - 1) / NINDIR(super);
                }
        } else
                nblk = fragroundup(super,sz);
        
        return nblk / 512;
#endif  /* COMPAT */
}

static int
isfree(struct ufs1_dinode *ip)
{
#ifdef  COMPAT
        return (ip->di_mode&IFMT) == 0;
#else   /* COMPAT */
        
        switch (ip->di_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 =
                    (struct user *)calloc(nusers,sizeof(struct user))))
                        errx(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 = (struct user *)calloc(nusers,sizeof(struct user))))
                errx(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;

        while (1) {
                for (usr = users + (uid&(nusers - 1)), i = nusers; --i >= 0;
                    usr--) {
                        if (!usr->name) {
                                usr->uid = uid;
                                
                                if (!(pwd = getpwuid(uid))) {
                                        if ((usr->name = (char *)malloc(7)))
                                                sprintf(usr->name,"#%d",uid);
                                } else {
                                        if ((usr->name = (char *)
                                            malloc(strlen(pwd->pw_name) + 1)))
                                                strcpy(usr->name,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(const void *v1, const void *v2)
{
        const struct user *u1, *u2;
        u1 = (const struct user *)v1;
        u2 = (const struct user *)v2;

        return u2->space - u1->space;
}

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

static void
uses(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(void)
{
        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, char *name)
{
        ino_t inode, maxino;
        struct ufs1_dinode *ip;
        daddr_t sz, ksz;
        struct fsizes *fp, **fsp;
        int i;

        maxino = super->fs_ncg * super->fs_ipg - 1;
#ifdef  COMPAT
        if (!(fsizes = (struct fsizes *)malloc(sizeof(struct fsizes))))
                errx(1, "allocate fsize structure");
#endif  /* COMPAT */
        for (inode = 0; inode < maxino; inode++) {
                errno = 0;
                if ((ip = get_inode(fd,super,inode))
#ifdef  COMPAT
                    && ((ip->di_mode&IFMT) == IFREG
                        || (ip->di_mode&IFMT) == IFDIR)
#else   /* COMPAT */
                    && !isfree(ip)
#endif  /* COMPAT */
                    ) {
                        sz = estimate ? virtualblocks(super,ip) :
                            actualblocks(super,ip);
#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); fsp = &fp->fsz_next) {
                                if (ksz < fp->fsz_last)
                                        break;
                        }
                        if (!fp || ksz < fp->fsz_first) {
                                if (!(fp = (struct fsizes *)
                                    malloc(sizeof(struct fsizes))))
                                        errx(1, "allocate fsize structure");
                                fp->fsz_next = *fsp;
                                *fsp = fp;
                                fp->fsz_first = rounddown(ksz, 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) {
                        err(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("%d\t%ju\t%d\n",fp->fsz_first + i,
                                    (uintmax_t)fp->fsz_count[i],
                                    SIZE(sz += fp->fsz_sz[i]));
                }
        }
}

static void
douser(int fd, struct fs *super, char *name)
{
        ino_t inode, maxino;
        struct user *usr, *usrs;
        struct ufs1_dinode *ip;
        int n;

        maxino = super->fs_ncg * super->fs_ipg - 1;
        for (inode = 0; inode < maxino; inode++) {
                errno = 0;
                if ((ip = get_inode(fd,super,inode))
                    && !isfree(ip))
                        uses(ip->di_uid,
                            estimate ? virtualblocks(super,ip) :
                                actualblocks(super,ip),
                            ip->di_atime);
                else if (errno) {
                        err(1, "%s", name);
                }
        }
        if (!(usrs = (struct user *)malloc(nusers * sizeof(struct user))))
                errx(1, "allocate users");
        bcopy(users,usrs,nusers * sizeof(struct user));
        sortusers(usrs);
        for (usr = usrs, n = nusers; --n >= 0 && usr->count; usr++) {
                printf("%5d",SIZE(usr->space));
                if (count)
                        printf("\t%5ld",usr->count);
                printf("\t%-8s",usr->name);
                if (unused)
                        printf("\t%5d\t%5d\t%5d",
                               SIZE(usr->spc30),
                               SIZE(usr->spc60),
                               SIZE(usr->spc90));
                printf("\n");
        }
        free(usrs);
}

static void
donames(int fd, struct fs *super, char *name)
{
        int c;
        ino_t inode;
        ino_t maxino;
        struct ufs1_dinode *ip;
        
        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("%"SCNuMAX,&inode) == 1) {
                if (inode > maxino) {
                        warnx("illegal inode %ju",(uintmax_t)inode);
                        return;
                }
                errno = 0;
                if ((ip = get_inode(fd,super,inode))
                    && !isfree(ip)) {
                        printf("%s\t",user(ip->di_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');
                } else {
                        if (errno) {
                                err(1, "%s", name);
                        }
                        /* skip this line */
                        while ((c = getchar()) != EOF && c != '\n');
                }
                if (c == EOF)
                        break;
        }
}

static void
usage(void)
{
#ifdef  COMPAT
        fprintf(stderr,"usage: quot [-nfcvha] [filesystem ...]\n");
#else   /* COMPAT */
        fprintf(stderr,"usage: quot [-acfhknv] [filesystem ...]\n");
#endif  /* COMPAT */
        exit(1);
}

static char superblock[SBSIZE];

void
quot(char *name, char *mp)
{
        int fd;

        get_inode(-1, NULL, 0);         /* flush cache */
        inituser();
        initfsizes();
        if ((fd = open(name,0)) < 0
            || lseek(fd,SBOFF,0) != SBOFF
            || read(fd,superblock,SBSIZE) != SBSIZE) {
                warn("%s", name);
                close(fd);
                return;
        }
        if (((struct fs *)superblock)->fs_magic != FS_MAGIC) {
                warnx("%s: not a BSD filesystem",name);
                close(fd);
                return;
        }
        printf("%s:",name);
        if (mp)
                printf(" (%s)",mp);
        putchar('\n');
        (*func)(fd,(struct fs *)superblock,name);
        close(fd);
}

int
main(int argc, char **argv)
{
        char all = 0;
        struct statfs *mp;
        struct fstab *fs;
        char dev[MNAMELEN + 1];
        char *nm;
        int cnt;

        func = douser;
#ifndef COMPAT
        header = getbsize(&headerlen,&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, "ufs", MFSNAMELEN)) {
                                if ((nm = strrchr(mp->f_mntfromname,'/'))) {
                                        sprintf(dev,"%s%s",_PATH_DEV,nm + 1);
                                        nm = dev;
                                } else
                                        nm = mp->f_mntfromname;
                                quot(nm,mp->f_mntonname);
                        }
                }
        }
        while (--argc >= 0) {
                if ((fs = getfsfile(*argv)) != NULL)
                        quot(fs->fs_spec, 0);
                else
                        quot(*argv,0);
                argv++;
        }
        return 0;
}