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/*
Simple Custom Mutator for AFL
Written by Khaled Yakdan <yakdan@code-intelligence.de>
This a simple mutator that assumes that the generates messages starting with
one of the three strings GET, PUT, or DEL followed by a payload. The mutator
randomly selects a commend and mutates the payload of the seed provided as
input.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static const char *commands[] = {
"GET",
"PUT",
"DEL",
};
static size_t data_size = 100;
size_t afl_custom_mutator(uint8_t *data, size_t size, uint8_t *mutated_out,
size_t max_size, unsigned int seed) {
// Seed the PRNG
srand(seed);
// Make sure that the packet size does not exceed the maximum size expected by
// the fuzzer
size_t mutated_size = data_size <= max_size ? data_size : max_size;
// Randomly select a command string to add as a header to the packet
memcpy(mutated_out, commands[rand() % 3], 3);
// Mutate the payload of the packet
for (int i = 3; i < mutated_size; i++) {
mutated_out[i] = (data[i] + rand() % 10) & 0xff;
}
return mutated_size;
}
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