/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
 */

#include <sys/param.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <libgeom.h>
#include <geom/raid3/g_raid3.h>
#include <core/geom.h>
#include <misc/subr.h>


uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_RAID3_VERSION;

static void raid3_main(struct gctl_req *req, unsigned f);
static void raid3_clear(struct gctl_req *req);
static void raid3_dump(struct gctl_req *req);
static void raid3_label(struct gctl_req *req);

struct g_command class_commands[] = {
        { "clear", G_FLAG_VERBOSE, raid3_main, G_NULL_OPTS,
            "[-v] prov ..."
        },
        { "configure", G_FLAG_VERBOSE, NULL,
            {
                { 'a', "autosync", NULL, G_TYPE_BOOL },
                { 'd', "dynamic", NULL, G_TYPE_BOOL },
                { 'f', "failsync", NULL, G_TYPE_BOOL },
                { 'F', "nofailsync", NULL, G_TYPE_BOOL },
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 'n', "noautosync", NULL, G_TYPE_BOOL },
                { 'r', "round_robin", NULL, G_TYPE_BOOL },
                { 'R', "noround_robin", NULL, G_TYPE_BOOL },
                { 'w', "verify", NULL, G_TYPE_BOOL },
                { 'W', "noverify", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-adfFhnrRvwW] name"
        },
        { "dump", 0, raid3_main, G_NULL_OPTS,
            "prov ..."
        },
        { "insert", G_FLAG_VERBOSE, NULL,
            {
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 'n', "number", G_VAL_OPTIONAL, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-hv] <-n number> name prov"
        },
        { "label", G_FLAG_VERBOSE, raid3_main,
            {
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 'F', "nofailsync", NULL, G_TYPE_BOOL },
                { 'n', "noautosync", NULL, G_TYPE_BOOL },
                { 'r', "round_robin", NULL, G_TYPE_BOOL },
                { 's', "sectorsize", "0", G_TYPE_NUMBER },
                { 'w', "verify", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-hFnrvw] [-s blocksize] name prov prov prov ..."
        },
        { "rebuild", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "[-v] name prov"
        },
        { "remove", G_FLAG_VERBOSE, NULL,
            {
                { 'n', "number", NULL, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-v] <-n number> name"
        },
        { "stop", G_FLAG_VERBOSE, NULL,
            {
                { 'f', "force", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-fv] name ..."
        },
        G_CMD_SENTINEL
};

static int verbose = 0;

static void
raid3_main(struct gctl_req *req, unsigned flags)
{
        const char *name;

        if ((flags & G_FLAG_VERBOSE) != 0)
                verbose = 1;

        name = gctl_get_ascii(req, "verb");
        if (name == NULL) {
                gctl_error(req, "No '%s' argument.", "verb");
                return;
        }
        if (strcmp(name, "label") == 0)
                raid3_label(req);
        else if (strcmp(name, "clear") == 0)
                raid3_clear(req);
        else if (strcmp(name, "dump") == 0)
                raid3_dump(req);
        else
                gctl_error(req, "Unknown command: %s.", name);
}

static void
raid3_label(struct gctl_req *req)
{
        struct g_raid3_metadata md;
        u_char sector[512];
        const char *str;
        unsigned sectorsize, ssize;
        off_t mediasize, msize;
        int hardcode, round_robin, verify;
        int error, i, nargs;

        bzero(sector, sizeof(sector));
        nargs = gctl_get_int(req, "nargs");
        if (nargs < 4) {
                gctl_error(req, "Too few arguments.");
                return;
        }
        if (bitcount32(nargs - 2) != 1) {
                gctl_error(req, "Invalid number of components.");
                return;
        }

        strlcpy(md.md_magic, G_RAID3_MAGIC, sizeof(md.md_magic));
        md.md_version = G_RAID3_VERSION;
        str = gctl_get_ascii(req, "arg0");
        strlcpy(md.md_name, str, sizeof(md.md_name));
        md.md_id = arc4random();
        md.md_all = nargs - 1;
        md.md_mflags = 0;
        md.md_dflags = 0;
        md.md_genid = 0;
        md.md_syncid = 1;
        md.md_sync_offset = 0;
        if (gctl_get_int(req, "noautosync"))
                md.md_mflags |= G_RAID3_DEVICE_FLAG_NOAUTOSYNC;
        if (gctl_get_int(req, "nofailsync"))
                md.md_mflags |= G_RAID3_DEVICE_FLAG_NOFAILSYNC;
        round_robin = gctl_get_int(req, "round_robin");
        if (round_robin)
                md.md_mflags |= G_RAID3_DEVICE_FLAG_ROUND_ROBIN;
        verify = gctl_get_int(req, "verify");
        if (verify)
                md.md_mflags |= G_RAID3_DEVICE_FLAG_VERIFY;
        if (round_robin && verify) {
                gctl_error(req, "Both '%c' and '%c' options given.", 'r', 'w');
                return;
        }
        hardcode = gctl_get_int(req, "hardcode");

        /*
         * Calculate sectorsize by finding least common multiple from
         * sectorsizes of every disk and find the smallest mediasize.
         */
        mediasize = 0;
        sectorsize = gctl_get_intmax(req, "sectorsize");
        for (i = 1; i < nargs; i++) {
                str = gctl_get_ascii(req, "arg%d", i);
                msize = g_get_mediasize(str);
                ssize = g_get_sectorsize(str);
                if (msize == 0 || ssize == 0) {
                        gctl_error(req, "Can't get informations about %s: %s.",
                            str, strerror(errno));
                        return;
                }
                msize -= ssize;
                if (mediasize == 0 || (mediasize > 0 && msize < mediasize))
                        mediasize = msize;
                if (sectorsize == 0)
                        sectorsize = ssize;
                else
                        sectorsize = g_lcm(sectorsize, ssize);
        }
        md.md_mediasize = mediasize * (nargs - 2);
        md.md_sectorsize = sectorsize * (nargs - 2);
        md.md_mediasize -= (md.md_mediasize % md.md_sectorsize);

        if (md.md_sectorsize > MAXPHYS) {
                gctl_error(req, "The blocksize is too big.");
                return;
        }

        /*
         * Clear last sector first, to spoil all components if device exists.
         */
        for (i = 1; i < nargs; i++) {
                str = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_clear(str, NULL);
                if (error != 0) {
                        gctl_error(req, "Can't store metadata on %s: %s.", str,
                            strerror(error));
                        return;
                }
        }

        /*
         * Ok, store metadata (use disk number as priority).
         */
        for (i = 1; i < nargs; i++) {
                str = gctl_get_ascii(req, "arg%d", i);
                msize = g_get_mediasize(str);
                ssize = g_get_sectorsize(str);
                if (mediasize < msize - ssize) {
                        fprintf(stderr,
                            "warning: %s: only %jd bytes from %jd bytes used.\n",
                            str, (intmax_t)mediasize, (intmax_t)(msize - ssize));
                }

                md.md_no = i - 1;
                md.md_provsize = msize;
                if (!hardcode)
                        bzero(md.md_provider, sizeof(md.md_provider));
                else {
                        if (strncmp(str, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
                                str += sizeof(_PATH_DEV) - 1;
                        strlcpy(md.md_provider, str, sizeof(md.md_provider));
                }
                if (verify && md.md_no == md.md_all - 1) {
                        /*
                         * In "verify" mode, force synchronization of parity
                         * component on start.
                         */
                        md.md_syncid = 0;
                }
                raid3_metadata_encode(&md, sector);
                error = g_metadata_store(str, sector, sizeof(sector));
                if (error != 0) {
                        fprintf(stderr, "Can't store metadata on %s: %s.\n",
                            str, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (verbose)
                        printf("Metadata value stored on %s.\n", str);
        }
}

static void
raid3_clear(struct gctl_req *req)
{
        const char *name;
        int error, i, nargs;

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 1) {
                gctl_error(req, "Too few arguments.");
                return;
        }

        for (i = 0; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_clear(name, G_RAID3_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Can't clear metadata on %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (verbose)
                        printf("Metadata cleared on %s.\n", name);
        }
}

static void
raid3_dump(struct gctl_req *req)
{
        struct g_raid3_metadata md, tmpmd;
        const char *name;
        int error, i, nargs;

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 1) {
                gctl_error(req, "Too few arguments.");
                return;
        }

        for (i = 0; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_read(name, (u_char *)&tmpmd, sizeof(tmpmd),
                    G_RAID3_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Can't read metadata from %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (raid3_metadata_decode((u_char *)&tmpmd, &md) != 0) {
                        fprintf(stderr, "MD5 hash mismatch for %s, skipping.\n",
                            name);
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                printf("Metadata on %s:\n", name);
                raid3_metadata_dump(&md);
                printf("\n");
        }
}