/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2004-2009 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 <err.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/mirror/g_mirror.h>
#include <core/geom.h>
#include <misc/subr.h>

uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_MIRROR_VERSION;

#define GMIRROR_BALANCE         "load"
#define GMIRROR_SLICE           "4096"
#define GMIRROR_PRIORITY        "0"

static void mirror_main(struct gctl_req *req, unsigned flags);
static void mirror_activate(struct gctl_req *req);
static void mirror_clear(struct gctl_req *req);
static void mirror_dump(struct gctl_req *req);
static void mirror_label(struct gctl_req *req);
static void mirror_resize(struct gctl_req *req, unsigned flags);

struct g_command class_commands[] = {
        { "activate", G_FLAG_VERBOSE, mirror_main, G_NULL_OPTS,
            "[-v] name prov ..."
        },
        { "clear", G_FLAG_VERBOSE, mirror_main, G_NULL_OPTS,
            "[-v] prov ..."
        },
        { "configure", G_FLAG_VERBOSE, NULL,
            {
                { 'a', "autosync", NULL, G_TYPE_BOOL },
                { 'b', "balance", "", G_TYPE_STRING },
                { '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 },
                { 'p', "priority", "-1", G_TYPE_NUMBER },
                { 's', "slice", "-1", G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-adfFhnv] [-b balance] [-s slice] name\n"
            "[-v] -p priority name prov"
        },
        { "create", G_FLAG_VERBOSE, NULL,
            {
                { 'b', "balance", GMIRROR_BALANCE, G_TYPE_STRING },
                { 'F', "nofailsync", NULL, G_TYPE_BOOL },
                { 'n', "noautosync", NULL, G_TYPE_BOOL },
                { 's', "slice", GMIRROR_SLICE, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-Fnv] [-b balance] [-s slice] name prov ..."
        },
        { "deactivate", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "[-v] name prov ..."
        },
        { "destroy", G_FLAG_VERBOSE, NULL,
            {
                { 'f', "force", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-fv] name ..."
        },
        { "dump", 0, mirror_main, G_NULL_OPTS,
            "prov ..."
        },
        { "forget", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "name ..."
        },
        { "label", G_FLAG_VERBOSE, mirror_main,
            {
                { 'b', "balance", GMIRROR_BALANCE, G_TYPE_STRING },
                { 'F', "nofailsync", NULL, G_TYPE_BOOL },
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 'n', "noautosync", NULL, G_TYPE_BOOL },
                { 's', "slice", GMIRROR_SLICE, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-Fhnv] [-b balance] [-s slice] name prov ..."
        },
        { "insert", G_FLAG_VERBOSE, NULL,
            {
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 'i', "inactive", NULL, G_TYPE_BOOL },
                { 'p', "priority", GMIRROR_PRIORITY, G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-hiv] [-p priority] name prov ..."
        },
        { "rebuild", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "[-v] name prov ..."
        },
        { "remove", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "[-v] name prov ..."
        },
        { "resize", G_FLAG_VERBOSE, mirror_resize,
            {
                { 's', "size", "*", G_TYPE_STRING },
                G_OPT_SENTINEL
            },
            "[-s size] [-v] 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
mirror_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)
                mirror_label(req);
        else if (strcmp(name, "clear") == 0)
                mirror_clear(req);
        else if (strcmp(name, "dump") == 0)
                mirror_dump(req);
        else if (strcmp(name, "activate") == 0)
                mirror_activate(req);
        else
                gctl_error(req, "Unknown command: %s.", name);
}

static void
mirror_label(struct gctl_req *req)
{
        struct g_mirror_metadata md;
        u_char sector[512];
        const char *str;
        unsigned sectorsize;
        off_t mediasize;
        intmax_t val;
        int error, i, nargs, bal, hardcode;

        bzero(sector, sizeof(sector));
        nargs = gctl_get_int(req, "nargs");
        if (nargs < 2) {
                gctl_error(req, "Too few arguments.");
                return;
        }

        strlcpy(md.md_magic, G_MIRROR_MAGIC, sizeof(md.md_magic));
        md.md_version = G_MIRROR_VERSION;
        str = gctl_get_ascii(req, "arg0");
        strlcpy(md.md_name, str, sizeof(md.md_name));
        md.md_mid = 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;
        val = gctl_get_intmax(req, "slice");
        md.md_slice = val;
        str = gctl_get_ascii(req, "balance");
        bal = balance_id(str);
        if (bal == -1) {
                gctl_error(req, "Invalid balance algorithm.");
                return;
        }
        md.md_balance = bal;
        if (gctl_get_int(req, "noautosync"))
                md.md_mflags |= G_MIRROR_DEVICE_FLAG_NOAUTOSYNC;
        if (gctl_get_int(req, "nofailsync"))
                md.md_mflags |= G_MIRROR_DEVICE_FLAG_NOFAILSYNC;
        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 = 0;
        for (i = 1; i < nargs; i++) {
                unsigned ssize;
                off_t msize;

                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;
        md.md_sectorsize = sectorsize;
        md.md_mediasize -= (md.md_mediasize % md.md_sectorsize);

        /*
         * 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);
                md.md_did = arc4random();
                md.md_priority = i - 1;
                md.md_provsize = g_get_mediasize(str);
                assert(md.md_provsize != 0);
                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));
                }
                mirror_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
mirror_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_MIRROR_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
mirror_dump(struct gctl_req *req)
{
        struct g_mirror_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_MIRROR_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 (mirror_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);
                mirror_metadata_dump(&md);
                printf("\n");
        }
}

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

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 2) {
                gctl_error(req, "Too few arguments.");
                return;
        }
        name = gctl_get_ascii(req, "arg0");

        for (i = 1; i < nargs; i++) {
                path = gctl_get_ascii(req, "arg%d", i);
                error = g_metadata_read(path, (u_char *)&tmpmd, sizeof(tmpmd),
                    G_MIRROR_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Cannot read metadata from %s: %s.\n",
                            path, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (mirror_metadata_decode((u_char *)&tmpmd, &md) != 0) {
                        fprintf(stderr,
                            "MD5 hash mismatch for provider %s, skipping.\n",
                            path);
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (strcmp(md.md_name, name) != 0) {
                        fprintf(stderr,
                            "Provider %s is not the mirror %s component.\n",
                            path, name);
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                md.md_dflags &= ~G_MIRROR_DISK_FLAG_INACTIVE;
                mirror_metadata_encode(&md, (u_char *)&tmpmd);
                error = g_metadata_store(path, (u_char *)&tmpmd, sizeof(tmpmd));
                if (error != 0) {
                        fprintf(stderr, "Cannot write metadata from %s: %s.\n",
                            path, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (verbose)
                        printf("Provider %s activated.\n", path);
        }
}

static struct gclass *
find_class(struct gmesh *mesh, const char *name)
{
        struct gclass *classp;

        LIST_FOREACH(classp, &mesh->lg_class, lg_class) {
                if (strcmp(classp->lg_name, name) == 0)
                        return (classp);
        }
        return (NULL);
}

static struct ggeom *
find_geom(struct gclass *classp, const char *name)
{
        struct ggeom *gp;

        LIST_FOREACH(gp, &classp->lg_geom, lg_geom) {
                if (strcmp(gp->lg_name, name) == 0)
                        return (gp);
        }
        return (NULL);
}

static void
mirror_resize(struct gctl_req *req, unsigned flags __unused)
{
        struct gmesh mesh;
        struct gclass *classp;
        struct ggeom *gp;
        struct gprovider *pp;
        struct gconsumer *cp;
        off_t size;
        int error, nargs;
        const char *name, *g;
        char ssize[30];

        nargs = gctl_get_int(req, "nargs");
        if (nargs != 1)
                errx(EXIT_FAILURE, "Invalid number of arguments.");
        name = gctl_get_ascii(req, "class");
        if (name == NULL)
                abort();
        g = gctl_get_ascii(req, "arg0");
        if (g == NULL)
                abort();
        error = geom_gettree_geom(&mesh, name, g, 1);
        if (error)
                errc(EXIT_FAILURE, error, "Cannot get GEOM tree");
        classp = find_class(&mesh, name);
        if (classp == NULL)
                errx(EXIT_FAILURE, "Class %s not found.", name);
        gp = find_geom(classp, g);
        if (gp == NULL)
                errx(EXIT_FAILURE, "No such geom: %s.", g);
        pp = LIST_FIRST(&gp->lg_provider);
        if (pp == NULL)
                errx(EXIT_FAILURE, "Provider of geom %s not found.", g);
        size = pp->lg_mediasize;
        name = gctl_get_ascii(req, "size");
        if (name == NULL)
                errx(EXIT_FAILURE, "The size is not specified.");
        if (*name == '*') {
#define CSZ(c)  ((c)->lg_provider->lg_mediasize - \
    (c)->lg_provider->lg_sectorsize)
                /* Find the maximum possible size */
                LIST_FOREACH(cp, &gp->lg_consumer, lg_consumer) {
                        if (CSZ(cp) > size)
                                size = CSZ(cp);
                }
                LIST_FOREACH(cp, &gp->lg_consumer, lg_consumer) {
                        if (CSZ(cp) < size)
                                size = CSZ(cp);
                }
#undef CSZ
                if (size == pp->lg_mediasize)
                        errx(EXIT_FAILURE,
                            "Cannot expand provider %s\n",
                            pp->lg_name);
        } else {
                error = g_parse_lba(name, pp->lg_sectorsize, &size);
                if (error)
                        errc(EXIT_FAILURE, error, "Invalid size param");
                size *= pp->lg_sectorsize;
        }
        snprintf(ssize, sizeof(ssize), "%ju", (uintmax_t)size);
        gctl_change_param(req, "size", -1, ssize);
        geom_deletetree(&mesh);
        gctl_issue(req);
}