/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 Mathew Jacob <mjacob@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 <unistd.h>
#include <uuid.h>
#include <geom/multipath/g_multipath.h>

#include "core/geom.h"
#include "misc/subr.h"

uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_MULTIPATH_VERSION;

static void mp_main(struct gctl_req *, unsigned int);
static void mp_label(struct gctl_req *);
static void mp_clear(struct gctl_req *);
static void mp_prefer(struct gctl_req *);

struct g_command class_commands[] = {
        {
                "create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL,
                {
                        { 'A', "active_active", NULL, G_TYPE_BOOL },
                        { 'R', "active_read", NULL, G_TYPE_BOOL },
                        G_OPT_SENTINEL
                },
                "[-vAR] name prov ..."
        },
        {
                "label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, mp_main,
                {
                        { 'A', "active_active", NULL, G_TYPE_BOOL },
                        { 'R', "active_read", NULL, G_TYPE_BOOL },
                        G_OPT_SENTINEL
                },
                "[-vAR] name prov ..."
        },
        { "configure", G_FLAG_VERBOSE, NULL,
                {
                        { 'A', "active_active", NULL, G_TYPE_BOOL },
                        { 'P', "active_passive", NULL, G_TYPE_BOOL },
                        { 'R', "active_read", NULL, G_TYPE_BOOL },
                        G_OPT_SENTINEL
                },
                "[-vAPR] name"
        },
        {
                "add", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name prov"
        },
        {
                "remove", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name prov"
        },
        {
                "prefer", G_FLAG_VERBOSE, mp_main, G_NULL_OPTS,
                "[-v] prov ..."
        },
        {
                "fail", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name prov"
        },
        {
                "restore", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name prov"
        },
        {
                "rotate", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name"
        },
        {
                "getactive", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name"
        },
        {
                "destroy", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name"
        },
        {
                "stop", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
                "[-v] name"
        },
        {
                "clear", G_FLAG_VERBOSE, mp_main, G_NULL_OPTS,
                "[-v] prov ..."
        },
        G_CMD_SENTINEL
};

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

        name = gctl_get_ascii(req, "verb");
        if (name == NULL) {
                gctl_error(req, "No '%s' argument.", "verb");
                return;
        }
        if (strcmp(name, "label") == 0) {
                mp_label(req);
        } else if (strcmp(name, "clear") == 0) {
                mp_clear(req);
        } else if (strcmp(name, "prefer") == 0) {
                mp_prefer(req);
        } else {
                gctl_error(req, "Unknown command: %s.", name);
        }
}

static void
mp_label(struct gctl_req *req)
{
        struct g_multipath_metadata md;
        off_t disksize = 0, msize;
        uint8_t *sector, *rsector;
        char *ptr;
        uuid_t uuid;
        ssize_t secsize = 0, ssize;
        uint32_t status;
        const char *name, *name2, *mpname;
        int error, i, nargs, fd;

        nargs = gctl_get_int(req, "nargs");
        if (nargs < 2) {
                gctl_error(req, "wrong number of arguments.");
                return;
        }

        /*
         * First, check each provider to make sure it's the same size.
         * This also gets us our size and sectorsize for the metadata.
         */
        for (i = 1; i < nargs; i++) {
                name = gctl_get_ascii(req, "arg%d", i);
                msize = g_get_mediasize(name);
                ssize = g_get_sectorsize(name);
                if (msize == 0 || ssize == 0) {
                        gctl_error(req, "cannot get information about %s: %s.",
                            name, strerror(errno));
                        return;
                }
                if (i == 1) {
                        secsize = ssize;
                        disksize = msize;
                } else {
                        if (secsize != ssize) {
                                gctl_error(req, "%s sector size %ju different.",
                                    name, (intmax_t)ssize);
                                return;
                        }
                        if (disksize != msize) {
                                gctl_error(req, "%s media size %ju different.",
                                    name, (intmax_t)msize);
                                return;
                        }
                }
                
        }

        /*
         * Generate metadata.
         */
        strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic));
        md.md_version = G_MULTIPATH_VERSION;
        mpname = gctl_get_ascii(req, "arg0");
        strlcpy(md.md_name, mpname, sizeof(md.md_name));
        md.md_size = disksize;
        md.md_sectorsize = secsize;
        uuid_create(&uuid, &status);
        if (status != uuid_s_ok) {
                gctl_error(req, "cannot create a UUID.");
                return;
        }
        uuid_to_string(&uuid, &ptr, &status);
        if (status != uuid_s_ok) {
                gctl_error(req, "cannot stringify a UUID.");
                return;
        }
        strlcpy(md.md_uuid, ptr, sizeof (md.md_uuid));
        md.md_active_active = gctl_get_int(req, "active_active");
        if (gctl_get_int(req, "active_read"))
                md.md_active_active = 2;
        free(ptr);

        /*
         * Allocate a sector to write as metadata.
         */
        sector = calloc(1, secsize);
        if (sector == NULL) {
                gctl_error(req, "unable to allocate metadata buffer");
                return;
        }
        rsector = malloc(secsize);
        if (rsector == NULL) {
                gctl_error(req, "unable to allocate metadata buffer");
                goto done;
        }

        /*
         * encode the metadata
         */
        multipath_metadata_encode(&md, sector);

        /*
         * Store metadata on the initial provider.
         */
        name = gctl_get_ascii(req, "arg1");
        error = g_metadata_store(name, sector, secsize);
        if (error != 0) {
                gctl_error(req, "cannot store metadata on %s: %s.", name, strerror(error));
                goto done;
        }

        /*
         * Now touch the rest of the providers to hint retaste.
         */
        for (i = 2; i < nargs; i++) {
                name2 = gctl_get_ascii(req, "arg%d", i);
                fd = g_open(name2, 1);
                if (fd < 0) {
                        fprintf(stderr, "Unable to open %s: %s.\n",
                            name2, strerror(errno));
                        continue;
                }
                if (pread(fd, rsector, secsize, disksize - secsize) !=
                    (ssize_t)secsize) {
                        fprintf(stderr, "Unable to read metadata from %s: %s.\n",
                            name2, strerror(errno));
                        g_close(fd);
                        continue;
                }
                g_close(fd);
                if (memcmp(sector, rsector, secsize)) {
                        fprintf(stderr, "No metadata found on %s."
                            " It is not a path of %s.\n",
                            name2, name);
                }
        }
done:
        free(rsector);
        free(sector);
}


static void
mp_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_MULTIPATH_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Can't clear metadata on %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
        }
}

static void
mp_prefer(struct gctl_req *req)
{
        const char *name, *comp, *errstr;
        int nargs;

        nargs = gctl_get_int(req, "nargs");
        if (nargs != 2) {
                gctl_error(req, "Usage: prefer GEOM PROVIDER");
                return;
        }
        name = gctl_get_ascii(req, "arg0");
        comp = gctl_get_ascii(req, "arg1");
        errstr = gctl_issue (req);
        if (errstr != NULL) {
                fprintf(stderr, "Can't set %s preferred provider to %s: %s.\n",
                    name, comp, errstr);
        }
}