diff options
Diffstat (limited to 'CAN-binder/libs/nanopb/tests/fuzztest/generate_message.c')
-rw-r--r-- | CAN-binder/libs/nanopb/tests/fuzztest/generate_message.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/CAN-binder/libs/nanopb/tests/fuzztest/generate_message.c b/CAN-binder/libs/nanopb/tests/fuzztest/generate_message.c deleted file mode 100644 index 6e492990..00000000 --- a/CAN-binder/libs/nanopb/tests/fuzztest/generate_message.c +++ /dev/null @@ -1,101 +0,0 @@ -/* Generates a random, valid protobuf message. Useful to seed - * external fuzzers such as afl-fuzz. - */ - -#include <pb_encode.h> -#include <pb_common.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <assert.h> -#include <time.h> -#include "alltypes_static.pb.h" - -static uint64_t random_seed; - -/* Uses xorshift64 here instead of rand() for both speed and - * reproducibility across platforms. */ -static uint32_t rand_word() -{ - random_seed ^= random_seed >> 12; - random_seed ^= random_seed << 25; - random_seed ^= random_seed >> 27; - return random_seed * 2685821657736338717ULL; -} - -/* Fills a buffer with random data. */ -static void rand_fill(uint8_t *buf, size_t count) -{ - while (count--) - { - *buf++ = rand_word() & 0xff; - } -} - -/* Check that size/count fields do not exceed their max size. - * Otherwise we would have to loop pretty long in generate_message(). - * Note that there may still be a few encoding errors from submessages. - */ -static void limit_sizes(alltypes_static_AllTypes *msg) -{ - pb_field_iter_t iter; - pb_field_iter_begin(&iter, alltypes_static_AllTypes_fields, msg); - while (pb_field_iter_next(&iter)) - { - if (PB_LTYPE(iter.pos->type) == PB_LTYPE_BYTES) - { - ((pb_bytes_array_t*)iter.pData)->size %= iter.pos->data_size - PB_BYTES_ARRAY_T_ALLOCSIZE(0); - } - - if (PB_HTYPE(iter.pos->type) == PB_HTYPE_REPEATED) - { - *((pb_size_t*)iter.pSize) %= iter.pos->array_size; - } - - if (PB_HTYPE(iter.pos->type) == PB_HTYPE_ONEOF) - { - /* Set the oneof to this message type with 50% chance. */ - if (rand_word() & 1) - { - *((pb_size_t*)iter.pSize) = iter.pos->tag; - } - } - } -} - -static void generate_message() -{ - alltypes_static_AllTypes msg; - uint8_t buf[8192]; - pb_ostream_t stream = {0}; - - do { - if (stream.errmsg) - fprintf(stderr, "Encoder error: %s\n", stream.errmsg); - - stream = pb_ostream_from_buffer(buf, sizeof(buf)); - rand_fill((void*)&msg, sizeof(msg)); - limit_sizes(&msg); - } while (!pb_encode(&stream, alltypes_static_AllTypes_fields, &msg)); - - fwrite(buf, 1, stream.bytes_written, stdout); -} - -int main(int argc, char **argv) -{ - if (argc > 1) - { - random_seed = atol(argv[1]); - } - else - { - random_seed = time(NULL); - } - - fprintf(stderr, "Random seed: %llu\n", (long long unsigned)random_seed); - - generate_message(); - - return 0; -} - |