/*
 * Copyright (c) 1993 University of Utah.
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 *
 * from: Utah $Hdr: vnconfig.c 1.1 93/12/15$
 *
 * @(#)vnconfig.c       8.1 (Berkeley) 12/15/93
 * $FreeBSD: src/usr.sbin/vnconfig/vnconfig.c,v 1.13.2.7 2003/06/02 09:10:27 maxim Exp $
 * $DragonFly: src/usr.sbin/vnconfig/vnconfig.c,v 1.15 2008/07/27 22:36:01 thomas Exp $
 */

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/linker.h>
#include <sys/mount.h>
#include <sys/module.h>
#include <sys/stat.h>
#include <sys/vnioctl.h>
#include <vfs/ufs/ufsmount.h>

#define LINESIZE        1024
#define ZBUFSIZE        32768

struct vndisk {
        char    *dev;
        char    *file;
        char    *autolabel;
        int     flags;
        int64_t size;
        char    *oarg;
} *vndisks;

#define VN_CONFIG       0x01
#define VN_UNCONFIG     0x02
#define VN_ENABLE       0x04
#define VN_DISABLE      0x08
#define VN_SWAP         0x10
#define VN_MOUNTRO      0x20
#define VN_MOUNTRW      0x40
#define VN_IGNORE       0x80
#define VN_SET          0x100
#define VN_RESET        0x200
#define VN_TRUNCATE     0x400
#define VN_ZERO         0x800

int nvndisks;

int all = 0;
int verbose = 0;
int global = 0;
int listopt = 0;
u_long setopt = 0;
u_long resetopt = 0;
const char *configfile;

int config(struct vndisk *);
void getoptions(struct vndisk *, const char *);
int getinfo(const char *vname);
char *rawdevice(const char *);
void readconfig(int);
static void usage(void);
static int64_t getsize(const char *arg);
static void do_autolabel(const char *dev, const char *label);
int what_opt(const char *, u_long *);

int
main(int argc, char *argv[])
{
        int i, rv;
        int flags = 0;
        int64_t size = 0;
        char *autolabel = NULL;
        char *s;

        configfile = _PATH_VNTAB;
        while ((i = getopt(argc, argv, "acdef:glr:s:S:TZL:uv")) != -1)
                switch (i) {

                /* all -- use config file */
                case 'a':
                        all++;
                        break;

                /* configure */
                case 'c':
                        flags |= VN_CONFIG;
                        flags &= ~VN_UNCONFIG;
                        break;

                /* disable */
                case 'd':
                        flags |= VN_DISABLE;
                        flags &= ~VN_ENABLE;
                        break;

                /* enable */
                case 'e':
                        flags |= (VN_ENABLE|VN_CONFIG);
                        flags &= ~(VN_DISABLE|VN_UNCONFIG);
                        break;

                /* alternate config file */
                case 'f':
                        configfile = optarg;
                        break;

                /* fiddle global options */
                case 'g':
                        global = 1 - global;
                        break;

                /* reset options */
                case 'r':
                        for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
                                if (what_opt(s, &resetopt))
                                        errx(1, "invalid options '%s'", s);
                        }
                        flags |= VN_RESET;
                        break;

                case 'l':
                        listopt = 1;
                        break;

                /* set options */
                case 's':
                        for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
                                if (what_opt(s, &setopt))
                                        errx(1, "invalid options '%s'", s);
                        }
                        flags |= VN_SET;
                        break;

                /* unconfigure */
                case 'u':
                        flags |= (VN_DISABLE|VN_UNCONFIG);
                        flags &= ~(VN_ENABLE|VN_CONFIG);
                        break;

                /* verbose */
                case 'v':
                        verbose++;
                        break;

                case 'S':
                        size = getsize(optarg);
                        flags |= VN_CONFIG;
                        flags &= ~VN_UNCONFIG;
                        break;

                case 'T':
                        flags |= VN_TRUNCATE;
                        break;

                case 'Z':
                        flags |= VN_ZERO;
                        break;

                case 'L':
                        autolabel = optarg;
                        break;

                default:
                        usage();
                }

        if (modfind("vn") < 0)
                if (kldload("vn") < 0 || modfind("vn") < 0)
                        warnx( "cannot find or load \"vn\" kernel module");

        rv = 0;
        if (listopt) {
                if(argc > optind)
                        while(argc > optind)
                                rv += getinfo( argv[optind++]);
                else {
                        rv = getinfo( NULL );
                }
                exit(rv);
        }

        if (flags == 0)
                flags = VN_CONFIG;
        if (all) {
                readconfig(flags);
        } else {
                vndisks = calloc(1, sizeof(struct vndisk));
                if (argc < optind + 1)
                        usage();
                vndisks[0].dev = argv[optind++];
                vndisks[0].file = argv[optind++];       /* may be NULL */
                vndisks[0].flags = flags;
                vndisks[0].size = size;
                vndisks[0].autolabel = autolabel;
                if (optind < argc)
                        getoptions(&vndisks[0], argv[optind]);
                nvndisks = 1;
        }
        rv = 0;
        for (i = 0; i < nvndisks; i++)
                rv += config(&vndisks[i]);
        exit(rv);
}

int
what_opt(const char *str, u_long *p)
{
        if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
        if (!strcmp(str,"labels")) { return 0; }        /* deprecated */
        if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }
        if (!strcmp(str,"debug")) { *p |= VN_DEBUG; return 0; }
        if (!strcmp(str,"io")) { *p |= VN_IO; return 0; }
        if (!strcmp(str,"all")) { *p |= ~0; return 0; }
        if (!strcmp(str,"none")) { *p |= 0; return 0; }
        return 1;
}

/*
 *
 * GETINFO
 *
 *      Print vnode disk information to stdout for the device at
 *      path 'vname', or all existing 'vn' devices if none is given.
 *      Any 'vn' devices must exist under /dev in order to be queried.
 *
 *      Todo: correctly use vm_secsize for swap-backed vn's ..
 */

int
getinfo( const char *vname )
{
        int i = 0, vd, printlim = 0;
        char vnpath[PATH_MAX];
        const char *tmp;

        struct vn_user vnu;
        struct stat sb;

        if (vname == NULL) {
                printlim = 1024;
        } else {
                tmp = vname;
                while (*tmp != 0) {
                        if(isdigit(*tmp)){
                                i = atoi(tmp);
                                printlim = i + 1;
                                break;
                        }
                        tmp++;
                }
                if (*tmp == '\0')
                        errx(1, "unknown vn device: %s", vname);
        }

        snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", i);

        vd = open(vnpath, O_RDONLY);
        if (vd < 0)
                err(1, "open: %s", vnpath);

        for (; i<printlim; i++) {

                bzero(&vnpath, sizeof(vnpath));
                bzero(&sb, sizeof(struct stat));
                bzero(&vnu, sizeof(struct vn_user));

                vnu.vnu_unit = i;

                snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", vnu.vnu_unit);

                if(stat(vnpath, &sb) < 0) {
                        break;
                }
                else {
                        if (ioctl(vd, VNIOCGET, &vnu) == -1) {
                                warn("vn%d: ioctl", i);
                                        continue;
                        }

                        fprintf(stdout, "vn%d: ", vnu.vnu_unit);

                        if (vnu.vnu_file[0] == 0)
                                fprintf(stdout, "not in use\n");
                        else if ((strcmp(vnu.vnu_file, _VN_USER_SWAP)) == 0)
                                fprintf(stdout,
                                        "consuming %jd VM pages\n",
                                        (intmax_t)vnu.vnu_size);
                        else
                                fprintf(stdout,
                                        "covering %s on %s, inode %ju\n",
                                        vnu.vnu_file,
                                        devname(vnu.vnu_dev, S_IFBLK),
                                        (uintmax_t)vnu.vnu_ino);
                }
        }
        close(vd);
        return 0;
}

int
config(struct vndisk *vnp)
{
        char *dev, *file, *rdev, *oarg;
        FILE *f;
        struct vn_ioctl vnio;
        int flags, pgsize, rv, status;
        u_long l;

        pgsize = getpagesize();

        status = rv = 0;

        /*
         * Prepend "/dev/" to the specified device name, if necessary.
         * Operate on vnp->dev because it is used later.
         */
        if (vnp->dev[0] != '/' && vnp->dev[0] != '.')
                asprintf(&vnp->dev, "%s%s", _PATH_DEV, vnp->dev);
        dev = vnp->dev;
        file = vnp->file;
        flags = vnp->flags;
        oarg = vnp->oarg;

        if (flags & VN_IGNORE)
                return(0);

        /*
         * When a regular file has been specified, do any requested setup
         * of the file.  Truncation (also creates the file if necessary),
         * sizing, and zeroing.
         */

        if (file && vnp->size != 0 && (flags & VN_CONFIG)) {
                int  fd;
                struct stat st;

                if (flags & VN_TRUNCATE)
                        fd = open(file, O_RDWR|O_CREAT|O_TRUNC, 0600);
                else
                        fd = open(file, O_RDWR);
                if (fd >= 0 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
                        if (st.st_size < vnp->size * pgsize)
                                ftruncate(fd, vnp->size * pgsize);
                        if (vnp->size != 0)
                                st.st_size = vnp->size * pgsize;

                        if (flags & VN_ZERO) {
                                char *buf = malloc(ZBUFSIZE);
                                bzero(buf, ZBUFSIZE);
                                while (st.st_size > 0) {
                                        int n = (st.st_size > ZBUFSIZE) ?
                                            ZBUFSIZE : (int)st.st_size;
                                        if (write(fd, buf, n) != n) {
                                                ftruncate(fd, 0);
                                                printf("Unable to ZERO file "
                                                       "%s\n", file);
                                                return(0);
                                        }
                                        st.st_size -= (off_t)n;
                                }
                        }
                        close(fd);
                } else {
                        printf("Unable to open file %s\n", file);
                        return(0);
                }
        } else if (file == NULL && vnp->size == 0 && (flags & VN_CONFIG)) {
                warnx("specify regular filename or swap size");
                return (0);
        }

        rdev = rawdevice(dev);
        f = fopen(rdev, "rw");
        if (f == NULL) {
                warn("%s", dev);
                return(1);
        }
        if (!strcmp(rdev, "/dev/vn")) {
                printf("%s\n", fdevname(fileno(f)));
                rv = asprintf(&dev, "%s%s", _PATH_DEV, fdevname(fileno(f)));
                if (rv < 0)
                        dev = fdevname(fileno(f));
        }

        vnio.vn_file = file;
        vnio.vn_size = vnp->size;       /* non-zero only if swap backed */

        /*
         * Disable the device
         */
        if (flags & VN_DISABLE) {
                if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
                        rv = unmount(oarg, 0);
                        if (rv) {
                                status--;
                                if (errno == EBUSY)
                                        flags &= ~VN_UNCONFIG;
                                if ((flags & VN_UNCONFIG) == 0)
                                        warn("umount");
                        } else if (verbose)
                                printf("%s: unmounted\n", dev);
                }
        }
        /*
         * Clear (un-configure) the device
         */
        if (flags & VN_UNCONFIG) {
                rv = ioctl(fileno(f), VNIOCDETACH, &vnio);
                if (rv) {
                        if (errno == ENODEV) {
                                if (verbose)
                                        printf("%s: not configured\n", dev);
                                rv = 0;
                        } else {
                                status--;
                                warn("VNIOCDETACH");
                        }
                } else if (verbose)
                        printf("%s: cleared\n", dev);
        }
        /*
         * Set specified options
         */
        if (flags & VN_SET) {
                l = setopt;
                if (global)
                        rv = ioctl(fileno(f), VNIOCGSET, &l);
                else
                        rv = ioctl(fileno(f), VNIOCUSET, &l);
                if (rv) {
                        status--;
                        warn("VNIO[GU]SET");
                } else if (verbose)
                        printf("%s: flags now=%08lx\n",dev,l);
        }
        /*
         * Reset specified options
         */
        if (flags & VN_RESET) {
                l = resetopt;
                if (global)
                        rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
                else
                        rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
                if (rv) {
                        status--;
                        warn("VNIO[GU]CLEAR");
                } else if (verbose)
                        printf("%s: flags now=%08lx\n",dev,l);
        }
        /*
         * Configure the device
         */
        if (flags & VN_CONFIG) {
                rv = ioctl(fileno(f), VNIOCATTACH, &vnio);
                if (rv) {
                        status--;
                        warn("VNIOCATTACH");
                        flags &= ~VN_ENABLE;
                } else {
                        if (verbose) {
                                printf("%s: %s, ", dev, file);
                                if (vnp->size != 0) {
                                        printf("%jd bytes mapped\n",
                                               (intmax_t)vnio.vn_size);
                                } else {
                                        printf("complete file mapped\n");
                                }
                        }
                        /*
                         * autolabel
                         */
                        if (vnp->autolabel) {
                                do_autolabel(vnp->dev, vnp->autolabel);
                        }
                }
        }
        /*
         * Set an option
         */
        if (flags & VN_SET) {
                l = setopt;
                if (global)
                        rv = ioctl(fileno(f), VNIOCGSET, &l);
                else
                        rv = ioctl(fileno(f), VNIOCUSET, &l);
                if (rv) {
                        status--;
                        warn("VNIO[GU]SET");
                } else if (verbose)
                        printf("%s: flags now=%08lx\n",dev,l);
        }
        /*
         * Reset an option
         */
        if (flags & VN_RESET) {
                l = resetopt;
                if (global)
                        rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
                else
                        rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
                if (rv) {
                        status--;
                        warn("VNIO[GU]CLEAR");
                } else if (verbose)
                        printf("%s: flags now=%08lx\n",dev,l);
        }

        /*
         * Close the device now, as we may want to mount it.
         */
        fclose(f);

        /*
         * Enable special functions on the device
         */
        if (flags & VN_ENABLE) {
                if (flags & VN_SWAP) {
                        rv = swapon(dev);
                        if (rv) {
                                status--;
                                warn("swapon");
                        }
                        else if (verbose)
                                printf("%s: swapping enabled\n", dev);
                }
                if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
                        struct ufs_args args;
                        int mflags;

                        args.fspec = dev;
                        mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
                        rv = mount("ufs", oarg, mflags, &args);
                        if (rv) {
                                status--;
                                warn("mount");
                        }
                        else if (verbose)
                                printf("%s: mounted on %s\n", dev, oarg);
                }
        }
/* done: */
        fflush(stdout);
        return(status < 0);
}

#define EOL(c)          ((c) == '\0' || (c) == '\n')
#define WHITE(c)        ((c) == ' ' || (c) == '\t' || (c) == '\n')

void
readconfig(int flags)
{
        char buf[LINESIZE];
        FILE *f;
        char *cp, *sp;
        int ix;
        int ax;

        f = fopen(configfile, "r");
        if (f == NULL)
                err(1, "%s", configfile);
        ix = 0;         /* number of elements */
        ax = 0;         /* allocated elements */
        while (fgets(buf, LINESIZE, f) != NULL) {
                cp = buf;
                if (*cp == '#')
                        continue;
                while (!EOL(*cp) && WHITE(*cp))
                        cp++;
                if (EOL(*cp))
                        continue;
                sp = cp;
                while (!EOL(*cp) && !WHITE(*cp))
                        cp++;
                if (EOL(*cp))
                        continue;
                *cp++ = '\0';

                if (ix == ax) {
                        ax = ax + 16;
                        vndisks = realloc(vndisks, ax * sizeof(struct vndisk));
                        bzero(&vndisks[ix], (ax - ix) * sizeof(struct vndisk));
                }
                vndisks[ix].dev = malloc(cp - sp);
                strcpy(vndisks[ix].dev, sp);
                while (!EOL(*cp) && WHITE(*cp))
                        cp++;
                if (EOL(*cp))
                        continue;
                sp = cp;
                while (!EOL(*cp) && !WHITE(*cp))
                        cp++;
                *cp++ = '\0';

                if (*sp == '%' && strtol(sp + 1, NULL, 0) > 0) {
                        vndisks[ix].size = getsize(sp + 1);
                } else {
                        vndisks[ix].file = malloc(cp - sp);
                        strcpy(vndisks[ix].file, sp);
                }

                while (!EOL(*cp) && WHITE(*cp))
                        cp++;
                vndisks[ix].flags = flags;
                if (!EOL(*cp)) {
                        sp = cp;
                        while (!EOL(*cp) && !WHITE(*cp))
                                cp++;
                        *cp++ = '\0';
                        getoptions(&vndisks[ix], sp);
                }
                nvndisks++;
                ix++;
        }
}

void
getoptions(struct vndisk *vnp, const char *fstr)
{
        int flags = 0;
        const char *oarg = NULL;

        if (strcmp(fstr, "swap") == 0)
                flags |= VN_SWAP;
        else if (strncmp(fstr, "mount=", 6) == 0) {
                flags |= VN_MOUNTRW;
                oarg = &fstr[6];
        } else if (strncmp(fstr, "mountrw=", 8) == 0) {
                flags |= VN_MOUNTRW;
                oarg = &fstr[8];
        } else if (strncmp(fstr, "mountro=", 8) == 0) {
                flags |= VN_MOUNTRO;
                oarg = &fstr[8];
        } else if (strcmp(fstr, "ignore") == 0)
                flags |= VN_IGNORE;
        vnp->flags |= flags;
        if (oarg) {
                vnp->oarg = malloc(strlen(oarg) + 1);
                strcpy(vnp->oarg, oarg);
        } else
                vnp->oarg = NULL;
}

char *
rawdevice(const char *dev)
{
        char *rawbuf, *dp, *ep;
        struct stat sb;
        int len;

        len = strlen(dev);
        rawbuf = malloc(len + 2);
        strcpy(rawbuf, dev);
        if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
                dp = strrchr(rawbuf, '/');
                if (dp) {
                        for (ep = &rawbuf[len]; ep > dp; --ep)
                                *(ep+1) = *ep;
                        *++ep = 'r';
                }
        }
        return (rawbuf);
}

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n%s\n%s\n",
                "usage: vnconfig [-cdeguvTZ] [-s options] [-r options]",
                "                [-S value] special_file [regular_file] [feature]",
                "       vnconfig -a [-cdeguv] [-s options] [-r options] [-f config_file]",
                "       vnconfig -l [special_file ...]");
        exit(1);
}

static int64_t
getsize(const char *arg)
{
        char *ptr;
        int pgsize = getpagesize();
        int64_t size = strtoq(arg, &ptr, 0);

        switch(tolower(*ptr)) {
        case 't':
                /*
                 * GULP!  Terabytes.  It's actually possible to create
                 * a 7.9 TB VN device, though newfs can't handle any single
                 * filesystem larger then 1 TB.
                 */
                size *= 1024;
                /* fall through */
        case 'g':
                size *= 1024;
                /* fall through */
        default:
        case 'm':
                size *= 1024;
                /* fall through */
        case 'k':
                size *= 1024;
                /* fall through */
        case 'c':
                break;
        }
        size = (size + pgsize - 1) / pgsize;
        return(size);
}

/*
 * DO_AUTOLABEL
 *
 *      Automatically label the device.  This will wipe any preexisting
 *      label.
 */

static void
do_autolabel(const char *dev __unused, const char *label __unused)
{
        /* XXX not yet implemented */
        fprintf(stderr, "autolabel not yet implemented, sorry\n");
        exit(1);
}