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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/backoff_entry_serializer.h"
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <optional>
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/memory/raw_ref.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "net/base/backoff_entry.h"
#include "net/base/backoff_entry_serializer_fuzzer_input.pb.h"
#include "testing/libfuzzer/proto/json_proto_converter.h"
#include "testing/libfuzzer/proto/lpm_interface.h"
namespace net {
namespace {
struct Environment {
Environment() { logging::SetMinLogLevel(logging::LOGGING_ERROR); }
};
class ProtoTranslator {
public:
explicit ProtoTranslator(const fuzz_proto::FuzzerInput& input)
: input_(input) {}
BackoffEntry::Policy policy() const {
return PolicyFromProto(input_->policy());
}
base::Time parse_time() const {
return base::Time() + base::Microseconds(input_->parse_time());
}
base::TimeTicks parse_time_ticks() const {
return base::TimeTicks() + base::Microseconds(input_->parse_time());
}
base::Time serialize_time() const {
return base::Time() + base::Microseconds(input_->serialize_time());
}
base::TimeTicks now_ticks() const {
return base::TimeTicks() + base::Microseconds(input_->now_ticks());
}
std::optional<base::Value> serialized_entry() const {
json_proto::JsonProtoConverter converter;
std::string json_array = converter.Convert(input_->serialized_entry());
std::optional<base::Value> value = base::JSONReader::Read(json_array);
return value;
}
private:
const raw_ref<const fuzz_proto::FuzzerInput> input_;
static BackoffEntry::Policy PolicyFromProto(
const fuzz_proto::BackoffEntryPolicy& policy) {
BackoffEntry::Policy new_policy;
new_policy.num_errors_to_ignore = policy.num_errors_to_ignore();
new_policy.initial_delay_ms = policy.initial_delay_ms();
new_policy.multiply_factor = policy.multiply_factor();
new_policy.jitter_factor = policy.jitter_factor();
new_policy.maximum_backoff_ms = policy.maximum_backoff_ms();
new_policy.entry_lifetime_ms = policy.entry_lifetime_ms();
new_policy.always_use_initial_delay = policy.always_use_initial_delay();
return new_policy;
}
};
class MockClock : public base::TickClock {
public:
MockClock() = default;
~MockClock() override = default;
void SetNow(base::TimeTicks now) { now_ = now; }
base::TimeTicks NowTicks() const override { return now_; }
private:
base::TimeTicks now_;
};
// Tests the "deserialize-reserialize" property. Deserializes a BackoffEntry
// from JSON, reserializes it, then deserializes again. Holding time constant,
// we check that the parsed BackoffEntry values are equivalent.
void TestDeserialize(const ProtoTranslator& translator) {
// Attempt to convert the json_proto.ArrayValue to a base::Value.
std::optional<base::Value> value = translator.serialized_entry();
if (!value)
return;
DCHECK(value->is_list());
BackoffEntry::Policy policy = translator.policy();
MockClock clock;
clock.SetNow(translator.parse_time_ticks());
// Attempt to deserialize a BackoffEntry.
std::unique_ptr<BackoffEntry> entry =
BackoffEntrySerializer::DeserializeFromList(
value->GetList(), &policy, &clock, translator.parse_time());
if (!entry)
return;
base::Value::List reserialized =
BackoffEntrySerializer::SerializeToList(*entry, translator.parse_time());
// Due to fuzzy interpretation in BackoffEntrySerializer::
// DeserializeFromList, we cannot assert that |*reserialized == *value|.
// Rather, we can deserialize |reserialized| and check that some weaker
// properties are preserved.
std::unique_ptr<BackoffEntry> entry_reparsed =
BackoffEntrySerializer::DeserializeFromList(reserialized, &policy, &clock,
translator.parse_time());
CHECK(entry_reparsed);
CHECK_EQ(entry_reparsed->failure_count(), entry->failure_count());
CHECK_LE(entry_reparsed->GetReleaseTime(), entry->GetReleaseTime());
}
// Tests the "serialize-deserialize" property. Serializes an arbitrary
// BackoffEntry to JSON, deserializes to another BackoffEntry, and checks
// equality of the two entries. Our notion of equality is *very weak* and needs
// improvement.
void TestSerialize(const ProtoTranslator& translator) {
BackoffEntry::Policy policy = translator.policy();
// Serialize the BackoffEntry.
BackoffEntry native_entry(&policy);
base::Value::List serialized = BackoffEntrySerializer::SerializeToList(
native_entry, translator.serialize_time());
MockClock clock;
clock.SetNow(translator.now_ticks());
// Deserialize it.
std::unique_ptr<BackoffEntry> deserialized_entry =
BackoffEntrySerializer::DeserializeFromList(serialized, &policy, &clock,
translator.parse_time());
// Even though SerializeToList was successful, we're not guaranteed to have a
// |deserialized_entry|. One reason deserialization may fail is if the parsed
// |absolute_release_time_us| is below zero.
if (!deserialized_entry)
return;
// TODO(dmcardle) Develop a stronger equality check for BackoffEntry.
// Note that while |BackoffEntry::GetReleaseTime| looks like an accessor, it
// returns a |value that is computed based on a random double, so it's not
// suitable for CHECK_EQ here. See |BackoffEntry::CalculateReleaseTime|.
CHECK_EQ(native_entry.failure_count(), deserialized_entry->failure_count());
}
} // namespace
DEFINE_PROTO_FUZZER(const fuzz_proto::FuzzerInput& input) {
static Environment env;
// Print the entire |input| protobuf if asked.
if (getenv("LPM_DUMP_NATIVE_INPUT")) {
std::cout << "input: " << input.DebugString();
}
ProtoTranslator translator(input);
// Skip this input if any of the time values are infinite.
if (translator.now_ticks().is_inf() || translator.parse_time().is_inf() ||
translator.serialize_time().is_inf()) {
return;
}
TestDeserialize(translator);
TestSerialize(translator);
}
} // namespace net
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