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// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_TEST_FUZZ_UTIL_NET_H
#define BITCOIN_TEST_FUZZ_UTIL_NET_H
#include <net.h>
#include <net_permissions.h>
#include <netaddress.h>
#include <node/connection_types.h>
#include <node/eviction.h>
#include <protocol.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/util.h>
#include <test/util/net.h>
#include <threadsafety.h>
#include <util/sock.h>
#include <chrono>
#include <cstdint>
#include <limits>
#include <memory>
#include <optional>
#include <string>
/**
* Create a CNetAddr. It may have `addr.IsValid() == false`.
* @param[in,out] fuzzed_data_provider Take data for the address from this, if `rand` is `nullptr`.
* @param[in,out] rand If not nullptr, take data from it instead of from `fuzzed_data_provider`.
* Prefer generating addresses using `fuzzed_data_provider` because it is not uniform. Only use
* `rand` if `fuzzed_data_provider` is exhausted or its data is needed for other things.
* @return a "random" network address.
*/
CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider, FastRandomContext* rand = nullptr) noexcept;
class FuzzedSock : public Sock
{
FuzzedDataProvider& m_fuzzed_data_provider;
/**
* Data to return when `MSG_PEEK` is used as a `Recv()` flag.
* If `MSG_PEEK` is used, then our `Recv()` returns some random data as usual, but on the next
* `Recv()` call we must return the same data, thus we remember it here.
*/
mutable std::optional<std::vector<uint8_t>> m_peek_data;
/**
* Whether to pretend that the socket is select(2)-able. This is randomly set in the
* constructor. It should remain constant so that repeated calls to `IsSelectable()`
* return the same value.
*/
const bool m_selectable;
public:
explicit FuzzedSock(FuzzedDataProvider& fuzzed_data_provider);
~FuzzedSock() override;
FuzzedSock& operator=(Sock&& other) override;
ssize_t Send(const void* data, size_t len, int flags) const override;
ssize_t Recv(void* buf, size_t len, int flags) const override;
int Connect(const sockaddr*, socklen_t) const override;
int Bind(const sockaddr*, socklen_t) const override;
int Listen(int backlog) const override;
std::unique_ptr<Sock> Accept(sockaddr* addr, socklen_t* addr_len) const override;
int GetSockOpt(int level, int opt_name, void* opt_val, socklen_t* opt_len) const override;
int SetSockOpt(int level, int opt_name, const void* opt_val, socklen_t opt_len) const override;
int GetSockName(sockaddr* name, socklen_t* name_len) const override;
bool SetNonBlocking() const override;
bool IsSelectable() const override;
bool Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred = nullptr) const override;
bool WaitMany(std::chrono::milliseconds timeout, EventsPerSock& events_per_sock) const override;
bool IsConnected(std::string& errmsg) const override;
};
[[nodiscard]] inline FuzzedSock ConsumeSock(FuzzedDataProvider& fuzzed_data_provider)
{
return FuzzedSock{fuzzed_data_provider};
}
inline CSubNet ConsumeSubNet(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<uint8_t>()};
}
inline CService ConsumeService(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
return {ConsumeNetAddr(fuzzed_data_provider), fuzzed_data_provider.ConsumeIntegral<uint16_t>()};
}
CAddress ConsumeAddress(FuzzedDataProvider& fuzzed_data_provider) noexcept;
template <bool ReturnUniquePtr = false>
auto ConsumeNode(FuzzedDataProvider& fuzzed_data_provider, const std::optional<NodeId>& node_id_in = std::nullopt) noexcept
{
const NodeId node_id = node_id_in.value_or(fuzzed_data_provider.ConsumeIntegralInRange<NodeId>(0, std::numeric_limits<NodeId>::max()));
const auto sock = std::make_shared<FuzzedSock>(fuzzed_data_provider);
const CAddress address = ConsumeAddress(fuzzed_data_provider);
const uint64_t keyed_net_group = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
const uint64_t local_host_nonce = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
const CAddress addr_bind = ConsumeAddress(fuzzed_data_provider);
const std::string addr_name = fuzzed_data_provider.ConsumeRandomLengthString(64);
const ConnectionType conn_type = fuzzed_data_provider.PickValueInArray(ALL_CONNECTION_TYPES);
const bool inbound_onion{conn_type == ConnectionType::INBOUND ? fuzzed_data_provider.ConsumeBool() : false};
NetPermissionFlags permission_flags = ConsumeWeakEnum(fuzzed_data_provider, ALL_NET_PERMISSION_FLAGS);
if constexpr (ReturnUniquePtr) {
return std::make_unique<CNode>(node_id,
sock,
address,
keyed_net_group,
local_host_nonce,
addr_bind,
addr_name,
conn_type,
inbound_onion,
CNodeOptions{ .permission_flags = permission_flags });
} else {
return CNode{node_id,
sock,
address,
keyed_net_group,
local_host_nonce,
addr_bind,
addr_name,
conn_type,
inbound_onion,
CNodeOptions{ .permission_flags = permission_flags }};
}
}
inline std::unique_ptr<CNode> ConsumeNodeAsUniquePtr(FuzzedDataProvider& fdp, const std::optional<NodeId>& node_id_in = std::nullopt) { return ConsumeNode<true>(fdp, node_id_in); }
void FillNode(FuzzedDataProvider& fuzzed_data_provider, ConnmanTestMsg& connman, CNode& node) noexcept EXCLUSIVE_LOCKS_REQUIRED(NetEventsInterface::g_msgproc_mutex);
#endif // BITCOIN_TEST_FUZZ_UTIL_NET_H
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