/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005-2006 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/types.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/journal/g_journal.h>
#include <core/geom.h>
#include <misc/subr.h>

#include "geom_journal.h"


uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_JOURNAL_VERSION;

static void journal_main(struct gctl_req *req, unsigned flags);
static void journal_clear(struct gctl_req *req);
static void journal_dump(struct gctl_req *req);
static void journal_label(struct gctl_req *req);

struct g_command class_commands[] = {
        { "clear", G_FLAG_VERBOSE, journal_main, G_NULL_OPTS,
            "[-v] prov ..."
        },
        { "dump", 0, journal_main, G_NULL_OPTS,
            "prov ..."
        },
        { "label", G_FLAG_VERBOSE, journal_main,
            {
                { 'c', "checksum", NULL, G_TYPE_BOOL },
                { 'f', "force", NULL, G_TYPE_BOOL },
                { 'h', "hardcode", NULL, G_TYPE_BOOL },
                { 's', "jsize", "-1", G_TYPE_NUMBER },
                G_OPT_SENTINEL
            },
            "[-cfhv] [-s jsize] dataprov [jprov]"
        },
        { "stop", G_FLAG_VERBOSE, NULL,
            {
                { 'f', "force", NULL, G_TYPE_BOOL },
                G_OPT_SENTINEL
            },
            "[-fv] name ..."
        },
        { "sync", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
            "[-v]"
        },
        G_CMD_SENTINEL
};

static int verbose = 0;

static void
journal_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)
                journal_label(req);
        else if (strcmp(name, "clear") == 0)
                journal_clear(req);
        else if (strcmp(name, "dump") == 0)
                journal_dump(req);
        else
                gctl_error(req, "Unknown command: %s.", name);
}

static int
g_journal_fs_exists(const char *prov)
{

        if (g_journal_ufs_exists(prov))
                return (1);
#if 0
        if (g_journal_otherfs_exists(prov))
                return (1);
#endif
        return (0);
}

static int
g_journal_fs_using_last_sector(const char *prov)
{

        if (g_journal_ufs_using_last_sector(prov))
                return (1);
#if 0
        if (g_journal_otherfs_using_last_sector(prov))
                return (1);
#endif
        return (0);
}

static void
journal_label(struct gctl_req *req)
{
        struct g_journal_metadata md;
        const char *data, *journal, *str;
        u_char sector[512];
        intmax_t jsize, msize, ssize;
        int error, force, i, nargs, checksum, hardcode;

        bzero(sector, sizeof(sector));
        nargs = gctl_get_int(req, "nargs");
        str = NULL;     /* gcc */

        strlcpy(md.md_magic, G_JOURNAL_MAGIC, sizeof(md.md_magic));
        md.md_version = G_JOURNAL_VERSION;
        md.md_id = arc4random();
        md.md_joffset = 0;
        md.md_jid = 0;
        md.md_flags = GJ_FLAG_CLEAN;
        checksum = gctl_get_int(req, "checksum");
        if (checksum)
                md.md_flags |= GJ_FLAG_CHECKSUM;
        force = gctl_get_int(req, "force");
        hardcode = gctl_get_int(req, "hardcode");

        if (nargs != 1 && nargs != 2) {
                gctl_error(req, "Invalid number of arguments.");
                return;
        }

        /* Verify the given providers. */
        for (i = 0; i < nargs; i++) {
                str = gctl_get_ascii(req, "arg%d", i);
                if (g_get_mediasize(str) == 0) {
                        gctl_error(req, "Invalid provider %s.", str);
                        return;
                }
        }

        data = gctl_get_ascii(req, "arg0");
        jsize = gctl_get_intmax(req, "jsize");
        journal = NULL;
        switch (nargs) {
        case 1:
                if (!force && g_journal_fs_exists(data)) {
                        gctl_error(req, "File system exists on %s and this "
                            "operation would destroy it.\nUse -f if you "
                            "really want to do it.", data);
                        return;
                }
                journal = data;
                msize = g_get_mediasize(data);
                ssize = g_get_sectorsize(data);
                if (jsize == -1) {
                        /*
                         * No journal size specified. 1GB should be safe
                         * default.
                         */
                        jsize = 1073741824ULL;
                } else {
                        if (jsize < 104857600) {
                                gctl_error(req, "Journal too small.");
                                return;
                        }
                        if ((jsize % ssize) != 0) {
                                gctl_error(req, "Invalid journal size.");
                                return;
                        }
                }
                if (jsize + ssize >= msize) {
                        gctl_error(req, "Provider too small for journalling. "
                            "You can try smaller jsize (default is %jd).",
                            jsize);
                        return;
                }
                md.md_jstart = msize - ssize - jsize;
                md.md_jend = msize - ssize;
                break;
        case 2:
                if (!force && g_journal_fs_using_last_sector(data)) {
                        gctl_error(req, "File system on %s is using the last "
                            "sector and this operation is going to overwrite "
                            "it. Use -f if you really want to do it.", data);
                        return;
                }
                journal = gctl_get_ascii(req, "arg1");
                if (jsize != -1) {
                        gctl_error(req, "jsize argument is valid only for "
                            "all-in-one configuration.");
                        return;
                }
                msize = g_get_mediasize(journal);
                ssize = g_get_sectorsize(journal);
                md.md_jstart = 0;
                md.md_jend = msize - ssize;
                break;
        }

        if (g_get_sectorsize(data) != g_get_sectorsize(journal)) {
                gctl_error(req, "Not equal sector sizes.");
                return;
        }

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

        /*
         * Ok, store metadata.
         */
        for (i = 0; i < nargs; i++) {
                switch (i) {
                case 0:
                        str = data;
                        md.md_type = GJ_TYPE_DATA;
                        if (nargs == 1)
                                md.md_type |= GJ_TYPE_JOURNAL;
                        break;
                case 1:
                        str = journal;
                        md.md_type = GJ_TYPE_JOURNAL;
                        break;
                }
                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));
                }
                journal_metadata_encode(&md, sector);
                error = g_metadata_store(str, sector, sizeof(sector));
                if (error != 0) {
                        fprintf(stderr, "Cannot 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
journal_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_JOURNAL_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Cannot 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
journal_dump(struct gctl_req *req)
{
        struct g_journal_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_JOURNAL_MAGIC);
                if (error != 0) {
                        fprintf(stderr, "Cannot read metadata from %s: %s.\n",
                            name, strerror(error));
                        gctl_error(req, "Not fully done.");
                        continue;
                }
                if (journal_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);
                journal_metadata_dump(&md);
                printf("\n");
        }
}