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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <fuzzer/FuzzedDataProvider.h>
#include <memory>
#include "base/check_op.h"
#include "net/base/address_list.h"
#include "net/base/net_errors.h"
#include "net/base/network_anonymization_key.h"
#include "net/base/test_completion_callback.h"
#include "net/dns/host_resolver.h"
#include "net/dns/mock_host_resolver.h"
#include "net/dns/public/secure_dns_policy.h"
#include "net/log/net_log.h"
#include "net/log/test_net_log.h"
#include "net/socket/fuzzed_socket.h"
#include "net/socket/socks_client_socket.h"
#include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
// Fuzzer for SocksClientSocket. Only covers the SOCKS4 handshake.
//
// |data| is used to create a FuzzedSocket to fuzz reads and writes, see that
// class for details.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// Including an observer; even though the recorded results aren't currently
// used, it'll ensure the netlogging code is fuzzed as well.
net::RecordingNetLogObserver net_log_observer;
FuzzedDataProvider data_provider(data, size);
// Determine if the DNS lookup returns synchronously or asynchronously,
// succeeds or fails. Only returning an IPv4 address is fine, as SOCKS only
// issues IPv4 requests.
net::MockHostResolver mock_host_resolver;
mock_host_resolver.set_synchronous_mode(data_provider.ConsumeBool());
if (data_provider.ConsumeBool()) {
mock_host_resolver.rules()->AddRule("*", "127.0.0.1");
} else {
mock_host_resolver.rules()->AddRule("*", net::ERR_NAME_NOT_RESOLVED);
}
net::TestCompletionCallback callback;
auto fuzzed_socket =
std::make_unique<net::FuzzedSocket>(&data_provider, net::NetLog::Get());
CHECK_EQ(net::OK, fuzzed_socket->Connect(callback.callback()));
net::SOCKSClientSocket socket(
std::move(fuzzed_socket), net::HostPortPair("foo", 80),
net::NetworkAnonymizationKey(), net::DEFAULT_PRIORITY,
&mock_host_resolver, net::SecureDnsPolicy::kAllow,
TRAFFIC_ANNOTATION_FOR_TESTS);
int result = socket.Connect(callback.callback());
callback.GetResult(result);
return 0;
}
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