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/*
* Copyright (c) 2020 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "../openbsd-compat/openbsd-compat.h"
#include "mutator_aux.h"
#include "dummy.h"
struct param {
int seed;
int dev;
struct blob wiredata;
};
struct param *
unpack(const uint8_t *ptr, size_t len)
{
cbor_item_t *item = NULL, **v;
struct cbor_load_result cbor;
struct param *p;
int ok = -1;
if ((p = calloc(1, sizeof(*p))) == NULL ||
(item = cbor_load(ptr, len, &cbor)) == NULL ||
cbor.read != len ||
cbor_isa_array(item) == false ||
cbor_array_is_definite(item) == false ||
cbor_array_size(item) != 3 ||
(v = cbor_array_handle(item)) == NULL)
goto fail;
if (unpack_int(v[0], &p->seed) < 0 ||
unpack_int(v[1], &p->dev) < 0 ||
unpack_blob(v[2], &p->wiredata) < 0)
goto fail;
ok = 0;
fail:
if (ok < 0) {
free(p);
p = NULL;
}
if (item)
cbor_decref(&item);
return p;
}
size_t
pack(uint8_t *ptr, size_t len, const struct param *p)
{
cbor_item_t *argv[3], *array = NULL;
size_t cbor_alloc_len, cbor_len = 0;
unsigned char *cbor = NULL;
memset(argv, 0, sizeof(argv));
if ((array = cbor_new_definite_array(3)) == NULL ||
(argv[0] = pack_int(p->seed)) == NULL ||
(argv[1] = pack_int(p->dev)) == NULL ||
(argv[2] = pack_blob(&p->wiredata)) == NULL)
goto fail;
for (size_t i = 0; i < 3; i++)
if (cbor_array_push(array, argv[i]) == false)
goto fail;
if ((cbor_len = cbor_serialize_alloc(array, &cbor,
&cbor_alloc_len)) > len) {
cbor_len = 0;
goto fail;
}
memcpy(ptr, cbor, cbor_len);
fail:
for (size_t i = 0; i < 3; i++)
if (argv[i])
cbor_decref(&argv[i]);
if (array)
cbor_decref(&array);
free(cbor);
return cbor_len;
}
size_t
pack_dummy(uint8_t *ptr, size_t len)
{
struct param dummy;
uint8_t blob[MAXCORPUS];
size_t blob_len;
memset(&dummy, 0, sizeof(dummy));
dummy.wiredata.len = sizeof(dummy_netlink_wiredata);
memcpy(&dummy.wiredata.body, &dummy_netlink_wiredata,
dummy.wiredata.len);
assert((blob_len = pack(blob, sizeof(blob), &dummy)) != 0);
if (blob_len > len) {
memcpy(ptr, blob, len);
return len;
}
memcpy(ptr, blob, blob_len);
return blob_len;
}
void
test(const struct param *p)
{
fido_nl_t *nl;
uint32_t target;
prng_init((unsigned int)p->seed);
fuzz_clock_reset();
fido_init(FIDO_DEBUG);
fido_set_log_handler(consume_str);
set_netlink_io_functions(fd_read, fd_write);
set_wire_data(p->wiredata.body, p->wiredata.len);
if ((nl = fido_nl_new()) == NULL)
return;
consume(&nl->fd, sizeof(nl->fd));
consume(&nl->nfc_type, sizeof(nl->nfc_type));
consume(&nl->nfc_mcastgrp, sizeof(nl->nfc_mcastgrp));
consume(&nl->saddr, sizeof(nl->saddr));
fido_nl_power_nfc(nl, (uint32_t)p->dev);
if (fido_nl_get_nfc_target(nl, (uint32_t)p->dev, &target) == 0)
consume(&target, sizeof(target));
fido_nl_free(&nl);
}
void
mutate(struct param *p, unsigned int seed, unsigned int flags) NO_MSAN
{
if (flags & MUTATE_SEED)
p->seed = (int)seed;
if (flags & MUTATE_PARAM)
mutate_int(&p->dev);
if (flags & MUTATE_WIREDATA)
mutate_blob(&p->wiredata);
}
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