/* $Id: ext2fs.c,v 1.2 2021/11/06 17:35:07 khorben Exp $ */
/* Copyright (c) 2011 khorben of UberWall */
/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */



#include <stddef.h>
#include <time.h>
#include "plugin.h"


/* ext2fs */
/* public */
/* types */
#pragma pack(1)
struct ext2fs_super_block
{
	unsigned int e2fs_icount;
	unsigned int e2fs_bcount;
	unsigned int e2fs_rbcount;
	unsigned int e2fs_fbcount;
	unsigned int e2fs_ficount;
	unsigned int e2fs_first_dblock;
	unsigned int e2fs_log_bsize;
	unsigned int e2fs_fsize;
	unsigned int e2fs_bpg;
	unsigned int e2fs_fpg;
	unsigned int e2fs_ipg;
	unsigned int e2fs_mtime;
	unsigned int e2fs_wtime;
	unsigned short e2fs_mnt_count;
	unsigned short e2fs_max_mnt_count;
	unsigned short e2fs_magic;
	unsigned short e2fs_state;
};
#pragma pack()


/* prototypes */
static int ext2fs_callback(PluginHelper * ph, int signature, FILE * fp);


/* variables */
/* magic */
static unsigned char sig1[] = "\xef\x53";
static unsigned char sig2[] = "\x53\xef";

static PluginMagic ext2fs_magic[] =
{
	{ sizeof(struct ext2fs_super_block),
		offsetof(struct ext2fs_super_block, e2fs_magic),
		sig1, sizeof(sig1) - 1 },
	{ sizeof(struct ext2fs_super_block),
		offsetof(struct ext2fs_super_block, e2fs_magic),
		sig2, sizeof(sig2) - 1 },
	{ 0, 0, NULL,	0		}
};

/* plugin */
Plugin plugin =
{
	PT_ARCHIVE,
	"EXT2FS",
	ext2fs_magic,
	ext2fs_callback
};


/* functions */
/* ext2fs_callback */
static int _callback_time(PluginHelper * ph, char const * what, time_t mtime);

static int ext2fs_callback(PluginHelper * ph, int signature, FILE * fp)
{
	int score = 0;
	struct ext2fs_super_block buf;
	(void) signature;

	if(fread(&buf, sizeof(buf), 1, fp) != 1)
		return -1;
	ph->printf(ph, "inode count %u, block count %u"
			", reserved block count %u", buf.e2fs_icount,
			buf.e2fs_bcount, buf.e2fs_rbcount);
	score += _callback_time(ph, "mount time", buf.e2fs_mtime);
	score += _callback_time(ph, "write time", buf.e2fs_wtime);
	ph->printf(ph, "\n");
	return score / 2;
}

static int _callback_time(PluginHelper * ph, char const * what, time_t mtime)
{
	struct tm tm;
	char tmp[22] = "";

	if(gmtime_r(&mtime, &tm) == NULL || strftime(tmp, sizeof(tmp),
				"%d/%m/%Y %H:%M:%S", &tm) == 0)
	{
		ph->printf(ph, "%s%s", ", unknown ", what);
		return 0;
	}
	ph->printf(ph, ", %s %s", what, tmp);
	/* between Wed May  1 00:00:00 CEST 1996 and now */
	return mtime > 830901600 && mtime < time(NULL) ? 100 : 0;
}