/*-
 * Copyright (c) 2010 Doug Rabson
 * Copyright (c) 2011 Andriy Gapon
 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
 * 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 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 AUTHOR 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 <sys/disk.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <md5.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>

#define NBBY 8

int
pager_output(const char *line)
{

        fprintf(stderr, "%s", line);
        return (0);
}

uint64_t
ldi_get_size(void *priv)
{
        struct stat sb;
        int fd;

        fd = *(int *)priv;
        if (fstat(fd, &sb) != 0)
                return (0);
        if (S_ISCHR(sb.st_mode) && ioctl(fd, DIOCGMEDIASIZE, &sb.st_size) != 0)
                return (0);
        return (sb.st_size);
}

#define ZFS_TEST
#define printf(...)      fprintf(stderr, __VA_ARGS__)
#include "libzfs.h"
#include "zfsimpl.c"
#undef printf

static int
vdev_read(vdev_t *vdev, void *priv, off_t off, void *buf, size_t bytes)
{
        int fd = *(int *)priv;

        if (pread(fd, buf, bytes, off) != bytes)
                return (-1);
        return (0);
}

static int
zfs_read(spa_t *spa, dnode_phys_t *dn, void *buf, size_t size, off_t off)
{
        const znode_phys_t *zp = (const znode_phys_t *) dn->dn_bonus;
        size_t n;
        int rc;

        n = size;
        if (off + n > zp->zp_size)
                n = zp->zp_size - off;

        rc = dnode_read(spa, dn, off, buf, n);
        if (rc != 0)
                return (-rc);

        return (n);
}

int
main(int argc, char** argv)
{
        char buf[512], hash[33];
        MD5_CTX ctx;
        struct stat sb;
        struct zfsmount zfsmnt;
        dnode_phys_t dn;
#if 0
        uint64_t rootobj;
#endif
        spa_t *spa;
        off_t off;
        ssize_t n;
        int i, failures, *fd;

        zfs_init();
        if (argc == 1) {
                static char *av[] = {
                        "zfsboottest",
                        "/dev/gpt/system0",
                        "/dev/gpt/system1",
                        "-",
                        "/boot/loader",
                        "/boot/support.4th",
                        "/boot/kernel/kernel",
                        NULL,
                };
                argc = sizeof(av) / sizeof(av[0]) - 1;
                argv = av;
        }
        for (i = 1; i < argc; i++) {
                if (strcmp(argv[i], "-") == 0)
                        break;
        }
        fd = malloc(sizeof(fd[0]) * (i - 1));
        if (fd == NULL)
                errx(1, "Unable to allocate memory.");
        for (i = 1; i < argc; i++) {
                if (strcmp(argv[i], "-") == 0)
                        break;
                fd[i - 1] = open(argv[i], O_RDONLY);
                if (fd[i - 1] == -1) {
                        warn("open(%s) failed", argv[i]);
                        continue;
                }
                if (vdev_probe(vdev_read, NULL, &fd[i - 1], NULL) != 0) {
                        warnx("vdev_probe(%s) failed", argv[i]);
                        close(fd[i - 1]);
                }
        }

        STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
                if (zfs_spa_init(spa)) {
                        fprintf(stderr, "can't init pool %s\n", spa->spa_name);
                        exit(1);
                }
        }

        spa_all_status();

        spa = STAILQ_FIRST(&zfs_pools);
        if (spa == NULL) {
                fprintf(stderr, "no pools\n");
                exit(1);
        }

#if 0
        uint64_t rootobj;
        if (zfs_get_root(spa, &rootobj)) {
                fprintf(stderr, "can't get root\n");
                exit(1);
        }

        if (zfs_mount(spa, rootobj, &zfsmnt)) {
#else
        if (zfs_mount(spa, 0, &zfsmnt)) {
                fprintf(stderr, "can't mount\n");
                exit(1);
#endif
        }

        printf("\n");
        for (++i, failures = 0; i < argc; i++) {
                if (zfs_lookup(&zfsmnt, argv[i], &dn)) {
                        fprintf(stderr, "%s: can't lookup\n", argv[i]);
                        failures++;
                        continue;
                }

                if (zfs_dnode_stat(spa, &dn, &sb)) {
                        fprintf(stderr, "%s: can't stat\n", argv[i]);
                        failures++;
                        continue;
                }

                off = 0;
                MD5Init(&ctx);
                do {
                        n = sb.st_size - off;
                        n = n > sizeof(buf) ? sizeof(buf) : n;
                        n = zfs_read(spa, &dn, buf, n, off);
                        if (n < 0) {
                                fprintf(stderr, "%s: zfs_read failed\n",
                                    argv[i]);
                                failures++;
                                break;
                        }
                        MD5Update(&ctx, buf, n);
                        off += n;
                } while (off < sb.st_size);
                if (off < sb.st_size)
                        continue;
                MD5End(&ctx, hash);
                printf("%s %s\n", hash, argv[i]);
        }

        return (failures == 0 ? 0 : 1);
}