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/*
File: fuzzerfidentify.cpp
Copyright (C) 2018 Christophe GRENIER <grenier@cgsecurity.org>
This software 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; either version 2 of the License, or
(at your option) any later version.
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 the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <dirent.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
#include <sys/types.h>
#include <unistd.h>
extern file_enable_t array_file_enable[];
extern file_check_list_t file_check_list;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
const size_t blocksize=65536;
static unsigned char *buffer_start=NULL;
static file_stat_t *file_stats=NULL;
static char *filename=NULL;
uint8_t *buffer;
if(Size == 0)
return 0;
if(filename==NULL)
{
pid_t pid=getpid();
filename=(char *)MALLOC(64);
sprintf(filename, "sample%u", pid);
}
if(file_stats==NULL)
{
/* Enable all file formats */
file_enable_t *file_enable;
for(file_enable=array_file_enable;file_enable->file_hint!=NULL;file_enable++)
file_enable->enable=1;
file_stats=init_file_stats(array_file_enable);
}
if(buffer_start==NULL)
{
buffer_start=(unsigned char *)MALLOC(2*blocksize);
}
buffer=buffer_start+blocksize;
memcpy(buffer, Data, (Size < blocksize ? Size : blocksize));
{
struct td_list_head *tmpl;
file_recovery_t file_recovery_new;
file_recovery_t file_recovery;
reset_file_recovery(&file_recovery);
file_recovery.blocksize=blocksize;
file_recovery_new.blocksize=blocksize;
file_recovery_new.file_stat=NULL;
td_list_for_each(tmpl, &file_check_list.list)
{
struct td_list_head *tmp;
const file_check_list_t *pos=td_list_entry_const(tmpl, const file_check_list_t, list);
if(pos->offset <= blocksize)
{
td_list_for_each(tmp, &pos->file_checks[buffer[pos->offset]].list)
{
const file_check_t *file_check=td_list_entry_const(tmp, const file_check_t, list);
if((file_check->length==0 ||
(file_check->offset+file_check->length <=blocksize &&
memcmp(buffer + file_check->offset, file_check->value, file_check->length)==0)) &&
file_check->header_check(buffer, blocksize, 0, &file_recovery, &file_recovery_new)!=0)
{
file_recovery_new.file_stat=file_check->file_stat;
break;
}
}
}
if(file_recovery_new.file_stat!=NULL)
break;
}
#if 0
if( file_recovery_new.file_stat!=NULL && file_recovery_new.file_stat->file_hint!=NULL &&
file_recovery_new.file_check!=NULL)
{
FILE *out;
file_recovery_new.file_size=Size;
file_recovery_new.calculated_file_size=Size;
out=fopen(filename, "wb");
fwrite(Data, Size, 1, out);
file_recovery_new.handle=out;
(file_recovery_new.file_check)(&file_recovery_new);
fclose(out);
// unlink(filename);
}
#endif
}
return 0; // Non-zero return values are reserved for future use.
}
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