/*-
 * Copyright (c) 2002 Marcel Moolenaar
 * 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 AUTHOR ``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 AUTHOR 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#ifdef __FBSDID
__FBSDID("$FreeBSD: src/sbin/gpt/migrate.c,v 1.16 2005/09/01 02:42:52 marcel Exp $");
#endif
#ifdef __RCSID
__RCSID("$NetBSD: migrate.c,v 1.37 2025/12/17 15:56:06 nia Exp $");
#endif

#include <sys/types.h>
#if defined(HAVE_SYS_ENDIAN_H) || ! defined(HAVE_NBTOOL_CONFIG_H)
#include <sys/endian.h>
#endif
#include <sys/param.h>
#define FSTYPENAMES
#define MBRPTYPENAMES
#ifdef HAVE_NBTOOL_CONFIG_H
#include <nbinclude/sys/bootblock.h>
#include <nbinclude/sys/disklabel.h>
#else
#include <sys/bootblock.h>
#include <sys/disklabel.h>
#endif

#include <err.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "map.h"
#include "gpt.h"
#include "gpt_private.h"

/*
 * Allow compilation on platforms that do not have a BSD label.
 * The values are valid for amd64, i386 and ia64 disklabels.
 * XXX: use disklabel_params from disklabel.c
 */
#ifndef LABELOFFSET
#define LABELOFFSET     0
#endif
#ifndef LABELSECTOR
#define LABELSECTOR     1
#endif
#ifndef RAW_PART
#define RAW_PART        3
#endif

/* FreeBSD filesystem types that don't match corresponding NetBSD types */
#define FREEBSD_FS_VINUM        14
#define FREEBSD_FS_ZFS          27

static int cmd_migrate(gpt_t, int, char *[]);

static const char *migratehelp[] = {
        "[-Afs] [-p partitions]",
};

const struct gpt_cmd c_migrate = {
        "migrate",
        cmd_migrate,
        migratehelp, __arraycount(migratehelp),
        GPT_SYNC,
};

#define usage() gpt_usage(NULL, &c_migrate)

static const char *
fstypename(u_int t)
{
        static char buf[64];
        if (t >= __arraycount(fstypenames)) {
                snprintf(buf, sizeof(buf), "*%u*", t);
                return buf;
        }
        return fstypenames[t];
}

static const char *
mbrptypename(u_int t)
{
        static char buf[64];
        size_t i;

        for (i = 0; i < __arraycount(mbr_ptypes); i++)
                if ((u_int)mbr_ptypes[i].id == t)
                        return mbr_ptypes[i].name;

        snprintf(buf, sizeof(buf), "*%u*", t);
        return buf;
}

static gpt_type_t
freebsd_fstype_to_gpt_type(gpt_t gpt, u_int i __unused, u_int fstype)
{
        switch (fstype) {
        case FS_UNUSED:
                return GPT_TYPE_INVALID;
        case FS_SWAP:
                return GPT_TYPE_FREEBSD_SWAP;
        case FS_BSDFFS:
                return GPT_TYPE_FREEBSD_UFS;
        case FREEBSD_FS_VINUM:
                return GPT_TYPE_FREEBSD_VINUM;
        case FREEBSD_FS_ZFS:
                return GPT_TYPE_FREEBSD_ZFS;
        default:
                gpt_warnx(gpt, "Unknown FreeBSD partition (%d)", fstype);
                return GPT_TYPE_INVALID;
        }
}

static gpt_type_t
netbsd_fstype_to_gpt_type(gpt_t gpt, u_int i, u_int fstype)
{
        switch (fstype) {
        case FS_UNUSED:
                return GPT_TYPE_INVALID;
        case FS_HFS:
                return GPT_TYPE_APPLE_HFS;
        case FS_EX2FS:
                return GPT_TYPE_LINUX_DATA;
        case FS_SWAP:
                return GPT_TYPE_NETBSD_SWAP;
        case FS_BSDFFS:
                return GPT_TYPE_NETBSD_FFS;
        case FS_BSDLFS:
                return GPT_TYPE_NETBSD_LFS;
        case FS_RAID:
                return GPT_TYPE_NETBSD_RAIDFRAME;
        case FS_CCD:
                return GPT_TYPE_NETBSD_CCD;
        case FS_CGD:
                return GPT_TYPE_NETBSD_CGD;
        default:
                gpt_warnx(gpt, "Partition %u unknown type %s, "
                    "using \"Microsoft Basic Data\"", i, fstypename(fstype));
                return GPT_TYPE_MS_BASIC_DATA;
        }
}

static struct gpt_ent *
migrate_disklabel(gpt_t gpt, off_t start, struct gpt_ent *ent,
    gpt_type_t (*convert)(gpt_t, u_int, u_int))
{
        char *buf;
        struct disklabel *dl;
        off_t ofs, rawofs;
        unsigned int i;
        gpt_type_t type;

        buf = gpt_read(gpt, start + LABELSECTOR, 1);
        if (buf == NULL) {
                gpt_warn(gpt, "Error reading label");
                return NULL;
        }
        dl = (void*)(buf + LABELOFFSET);

        if (le32toh(dl->d_magic) != DISKMAGIC ||
            le32toh(dl->d_magic2) != DISKMAGIC) {
                gpt_warnx(gpt, "MBR partition without disklabel");
                free(buf);
                return ent;
        }

        rawofs = le32toh(dl->d_partitions[RAW_PART].p_offset) *
            le32toh(dl->d_secsize);
        for (i = 0; i < le16toh(dl->d_npartitions); i++) {
                if (dl->d_partitions[i].p_fstype == FS_UNUSED)
                        continue;
                ofs = le32toh(dl->d_partitions[i].p_offset) *
                    le32toh(dl->d_secsize);
                if (ofs < rawofs)
                        rawofs = 0;
        }

        if (gpt->verbose > 1)
                gpt_msg(gpt, "rawofs=%ju", (uintmax_t)rawofs);
        rawofs /= gpt->secsz;

        for (i = 0; i < le16toh(dl->d_npartitions); i++) {
                if (gpt->verbose > 1)
                        gpt_msg(gpt, "Disklabel partition %u type %s", i,
                            fstypename(dl->d_partitions[i].p_fstype));

                type = (*convert)(gpt, i, dl->d_partitions[i].p_fstype);
                if (type == GPT_TYPE_INVALID)
                        continue;

                gpt_uuid_create(type, ent->ent_type,
                    ent->ent_name, sizeof(ent->ent_name));

                ofs = (le32toh(dl->d_partitions[i].p_offset) *
                    le32toh(dl->d_secsize)) / gpt->secsz;
                ofs = (ofs > 0) ? ofs - rawofs : 0;
                ent->ent_lba_start = htole64((uint64_t)ofs);
                ent->ent_lba_end = htole64((uint64_t)(ofs +
                    (off_t)le32toh((uint64_t)dl->d_partitions[i].p_size)
                    - 1LL));
                ent++;
        }

        free(buf);
        return ent;
}

static int
migrate(gpt_t gpt, u_int parts, int force, int slice, int active)
{
        off_t last = gpt_last(gpt);
        map_t map;
        struct gpt_ent *ent;
        struct mbr *mbr;
        uint32_t start, size;
        unsigned int i;
        gpt_type_t type = GPT_TYPE_INVALID;

        map = map_find(gpt, MAP_TYPE_MBR);
        if (map == NULL || map->map_start != 0) {
                gpt_warnx(gpt, "No MBR in disk to convert");
                return -1;
        }

        mbr = map->map_data;

        if (gpt_create(gpt, last, parts, 0) == -1)
                return -1;

        ent = gpt->tbl->map_data;

        /* Mirror partitions. */
        for (i = 0; i < 4; i++) {
                start = le16toh(mbr->mbr_part[i].part_start_hi);
                start = (start << 16) + le16toh(mbr->mbr_part[i].part_start_lo);
                size = le16toh(mbr->mbr_part[i].part_size_hi);
                size = (size << 16) + le16toh(mbr->mbr_part[i].part_size_lo);

                if (gpt->verbose > 1)
                        gpt_msg(gpt, "MBR partition %u type %s", i,
                            mbrptypename(mbr->mbr_part[i].part_typ));
                switch (mbr->mbr_part[i].part_typ) {
                case MBR_PTYPE_UNUSED:
                        continue;

                case MBR_PTYPE_386BSD: /* FreeBSD */
                        if (slice) {
                                type = GPT_TYPE_FREEBSD;
                                break;
                        } else {
                                ent = migrate_disklabel(gpt, start, ent,
                                    freebsd_fstype_to_gpt_type);
                                continue;
                        }

                case MBR_PTYPE_NETBSD:  /* NetBSD */
                        ent = migrate_disklabel(gpt, start, ent,
                            netbsd_fstype_to_gpt_type);
                        continue;

                case MBR_PTYPE_EFI:
                        type = GPT_TYPE_EFI;
                        break;

                case MBR_PTYPE_FAT12:
                case MBR_PTYPE_FAT16S:
                case MBR_PTYPE_FAT16B:
                case MBR_PTYPE_NTFS:
                case MBR_PTYPE_FAT32:
                case MBR_PTYPE_FAT32L:
                case MBR_PTYPE_FAT16L:
                case MBR_PTYPE_OS2_DOS12:
                case MBR_PTYPE_OS2_DOS16S:
                case MBR_PTYPE_OS2_DOS16B:
                case MBR_PTYPE_OS2_IFS:
                case MBR_PTYPE_HID_FAT32:
                case MBR_PTYPE_HID_FAT32_LBA:
                case MBR_PTYPE_HID_FAT16_LBA:
                        type = GPT_TYPE_MS_BASIC_DATA;
                        break;

                default:
                        if (!force) {
                                gpt_warnx(gpt, "unknown partition type (%d)",
                                    mbr->mbr_part[i].part_typ);
                                return -1;
                        }
                        continue;
                }
                gpt_uuid_create(type, ent->ent_type, ent->ent_name,
                    sizeof(ent->ent_name));
                ent->ent_lba_start = htole64((uint64_t)start);
                ent->ent_lba_end = htole64((uint64_t)(start + size - 1LL));
                ent++;
        }

        if (gpt_write_primary(gpt) == -1)
                return -1;

        if (gpt_write_backup(gpt) == -1)
                return -1;

        /*
         * Turn the MBR into a Protective MBR.
         */
        memset(mbr->mbr_part, 0, sizeof(mbr->mbr_part));
        gpt_create_pmbr_part(mbr->mbr_part, last, active);
        if (gpt_write(gpt, map) == -1) {
                gpt_warn(gpt, "Cant write PMBR");
                return -1;
        }
        return 0;
}

static int
cmd_migrate(gpt_t gpt, int argc, char *argv[])
{
        int ch;
        int force = 0;
        int slice = 0;
        int active = 0;
        u_int parts = 128;

        /* Get the migrate options */
        while ((ch = getopt(argc, argv, "Afp:s")) != -1) {
                switch(ch) {
                case 'A':
                        active = 1;
                        break;
                case 'f':
                        force = 1;
                        break;
                case 'p':
                        if (gpt_uint_get(gpt, &parts) == -1)
                                return usage();
                        break;
                case 's':
                        slice = 1;
                        break;
                default:
                        return usage();
                }
        }

        if (argc != optind)
                return usage();

        return migrate(gpt, parts, force, slice, active);
}