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# Persistent fuzzing #
Honggfuzz is capable of fuzzing APIs, which is to say; to test new data within the same process. This speeds-up the process of fuzzing APIs greatly
# Requirements for hardware-based counter-based fuzzing #
* GNU/Linux
# HowTo #
Prepare a binary in the two following ways:
## ASAN-style (_LLVMFuzzerTestOneInput_) ##
Two functions must be provided
```c
int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
````
and optionally
```c
int LLVMFuzzerInitialize(int *argc, char ***argv)
```
### Example (test.c):
```c
int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
TestAPI(buf, len);
return 0;
}
```
### Compilation
```shell
$ hfuzz_cc/hfuzz-clang test.c -o test
```
### Fuzzing
```shell
$ honggfuzz -P -- ./test
```
## HF_ITER style ##
A complete program needs to be prepared, using ```HF_ITER``` symbol to fetch new inputs from honggfuzz
### Example (test.c):
```c
#include <inttypes.h>
extern HF_ITER(uint8_t** buf, size_t* len);
int main(void) {
for (;;) {
size_t len;
uint8_t *buf;
HF_ITER(&buf, &len);
ApiToBeFuzzed(buf, len);
}
}
```
### Compilation
```shell
$ hfuzz_cc/hfuzz-clang test.c -o test
```
## Fuzzing
```
$ honggfuzz -P -- ./test
```
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