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cfl-utils.h
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cfl-utils.h
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#ifndef UTILS
#define UTILS
#include "./include/types.h"
#include "./include/config.h"
#include "./include/debug.h"
#include "./include/allocator_inheritance.h"
#include "./include/hash.h"
#include "./cfl-fuzz.h"
#include <stdio.h>
#include <string.h>
#include <sys/shm.h>
#include <sys/time.h>
#include <unistd.h>
#include <sys/stat.h>
#include "./Mutations.h"
/* 设置各个文件标识符 主要是创建输出目录 并设置常用的如/dev/null等目录 */
static void setup_dirs_fds(struct Fuzzer_fd *fuzzer_fd)
{
u8 *tmp;
s32 fd;
ACTF("Setting up output directories...");
if (mkdir(fuzzer_fd->out_dir, 0700))
{
if (errno != EEXIST)
PFATAL("Unable to create '%s'", fuzzer_fd->out_dir);
}
else
{
fuzzer_fd->out_dir_fd = open(fuzzer_fd->out_dir, O_RDONLY);
}
/* 用于存储初始和发现的测试用例的队列目录。*/
tmp = alloc_printf("%s/queue", fuzzer_fd->out_dir);
if (mkdir(tmp, 0700))
if (errno != EEXIST)
PT("Unable to create '%s'\n", tmp);
check_free(tmp);
/* 所有记录的崩溃。*/
tmp = alloc_printf("%s/crashes", fuzzer_fd->out_dir);
if (mkdir(tmp, 0700))
if (errno != EEXIST)
PT("Unable to create '%s'\n", tmp);
check_free(tmp);
/* 记录所有的超时*/
tmp = alloc_printf("%s/timed_outs", fuzzer_fd->out_dir);
if (mkdir(tmp, 0700))
PT("Already exist . Unable to create '%s'\n", tmp);
check_free(tmp);
/* 一些有用的文件描述符。*/
fuzzer_fd->dev_null_fd = open("/dev/null", O_RDWR);
if (fuzzer_fd->dev_null_fd < 0)
PFATAL("Unable to open /dev/null");
fuzzer_fd->dev_urandom_fd = open("/dev/urandom", O_RDONLY);
if (fuzzer_fd->dev_urandom_fd < 0)
PFATAL("Unable to open /dev/urandom");
}
/* 设置用于传参的 ./cur_input 获取相应的文件标识符 */
static void setup_pass_param_file(struct Fuzzer_fd *fuzzer_fd) {
u8 * fn = alloc_printf("%s/.cur_input", fuzzer_fd->out_dir);
//如果存在先删除
unlink(fn); /* Ignore errors */
fuzzer_fd->cur_input = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
if (fuzzer_fd->cur_input < 0) PFATAL("Unable to create '%s'", fn);
check_free(fn);
}
/* 将变异后的数据写入到 cur_input 中 即运行子程序时的标准输入流 并且写入之前记录的要传给子程序的参数 */
static void write_to_testcase(void* mem, u32 len,struct Fuzzer_fd *fuzzer_fd) {
lseek(fuzzer_fd->cur_input,0,SEEK_SET);
write(fuzzer_fd->cur_input, mem, len);
if (ftruncate(fuzzer_fd->cur_input, len)) PFATAL("ftruncate() failed");
lseek(fuzzer_fd->cur_input, 0, SEEK_SET);
}
/* 若 bitmap 发生更改 则将其写入文件 */
static void write_bitmap(struct Fuzzer_resource *fuzzer_res, struct Fuzzer_fd *fuzzer_fd ,int *bitmap_changed) {
u8* fname;
s32 fd;
//更改了才写
if (!(*bitmap_changed)) return;
(*bitmap_changed) = 0;
fname = alloc_printf("%s/fuzz_bitmap", fuzzer_fd->out_dir);
fd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (fd < 0) PFATAL("Unable to open '%s'", fname);
check_write(fd, fuzzer_res->virgin_bits, MAP_SIZE, fname);
close(fd);
check_free(fname);
}
static u8 edges_only; /* Ignore hit counts? */
void Cmd_usage(u8* argv0) {
PT("\n%s [ options ] --/path/to/fuzzed_app [ ... ]\n\n"
"Required parameters:\n\n"
" -i dir - input directory with test cases\n"
" -o dir - output directory for fuzzer findings\n\n",
argv0);
exit(1);
}
//解析命令行参数
int Parse_command_line(int argc,char *argv[], char *options[], char *values[],char **program_argv,int *num_program_argv,char *tagget_program_path) {
int i, num_options = 0;
int isthere_path = 0;
for (i = 1; i < argc && num_options < MAX_ARGS; i++) {
if (argv[i][0] == '-' && argv[i][1] != '-') {
if (i + 1 < argc && argv[i + 1][0] != '-') {
options[num_options] = &argv[i][1];
values[num_options++] = argv[i + 1];
i++;
}else {
options[num_options] = &argv[i][1];
values[num_options++] = NULL;
}
} else if (argv[i][0] == '-' && argv[i][1] == '-') //这里假设程序 path 只输入在末尾
{
strcpy(tagget_program_path,&argv[i++][2]);
while(i<argc){
program_argv[(*num_program_argv)++] = argv[i++];
}
break;
}
else {
fprintf(stderr, "Invalid argument: %s\n", argv[i]);
Cmd_usage(argv[0]);
exit(1);
}
}
if(isthere_path){
fprintf(stderr, "Please input your target program path with --");
Cmd_usage(argv[0]);
}
else return num_options;
}
static u64 get_cur_time(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec * 1000ULL) + (tv.tv_usec / 1000);
}
#define FF(_b) (0xff << ((_b) << 3))
static u32 count_bytes(u8* mem) {
u32* ptr = (u32*)mem;
u32 i = (MAP_SIZE >> 2);
u32 ret = 0;
while (i--) {
u32 v = *(ptr++);
if (!v) continue;
if (v & FF(0)) ret++;
if (v & FF(1)) ret++;
if (v & FF(2)) ret++;
if (v & FF(3)) ret++;
}
return ret;
}
static void write_to_timeout(void* mem, u32 len,struct Fuzzer_fd *fuzzer_fd,struct Fuzzer_current_message *fuzzer_cur_msg) {
u8 *tmp;
u8 *fn;
s32 fd;
tmp = alloc_printf("%s/time_outs", fuzzer_fd->out_dir);
fn = alloc_printf("%s/%d",tmp,fuzzer_cur_msg->write_timeout++);
fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
write(fd, mem, len);
//将文件指针指回文件开头
lseek(fd,0, SEEK_SET);
//释放资源
check_free(tmp);
check_free(fn);
close(fd);
}
static void write_to_crash(void* mem, u32 len,struct Fuzzer_fd *fuzzer_fd,struct Fuzzer_current_message *fuzzer_cur_msg) {
u8 *tmp;
u8 *fn;
s32 fd;
tmp = alloc_printf("%s/crashes", fuzzer_fd->out_dir);
fn = alloc_printf("%s/%d",tmp,fuzzer_cur_msg->total_crashes++);
fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
write(fd, mem, len);
//将文件指针指回文件开头
lseek(fd,0, SEEK_SET);
//释放资源
check_free(tmp);
check_free(fn);
close(fd);
}
typedef struct {
char *str;
size_t length;
} RandomData;
// 生成随机字符串的函数
RandomData generate_random_data(size_t max_length) {
// 初始化随机数种子
srand(time(NULL));
// 随机确定字符串长度,范围在 1 到 max_length 之间
size_t length = rand() % max_length + 1;
// 分配内存用于存储随机字符串
char *str = (char *)malloc((length + 1) * sizeof(char));
if (str == NULL) {
fprintf(stderr, "Memory allocation failed\n");
exit(EXIT_FAILURE);
}
// 生成随机字符串
const char charset[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
for (size_t i = 0; i < length; i++) {
int key = rand() % (sizeof(charset) - 1);
str[i] = charset[key];
}
str[length] = '\0'; // 确保字符串以 null 结尾
// 创建 RandomString 结构体并返回
RandomData result;
result.str = str;
result.length = length;
return result;
}
#endif