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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.
#include <test/fuzz/util/net.h>
#include <compat/compat.h>
#include <netaddress.h>
#include <protocol.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/util.h>
#include <test/util/net.h>
#include <util/sock.h>
#include <util/time.h>
#include <version.h>
#include <array>
#include <cassert>
#include <cerrno>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <thread>
#include <vector>
class CNode;
CNetAddr ConsumeNetAddr(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
const Network network = fuzzed_data_provider.PickValueInArray({Network::NET_IPV4, Network::NET_IPV6, Network::NET_INTERNAL, Network::NET_ONION});
CNetAddr net_addr;
if (network == Network::NET_IPV4) {
in_addr v4_addr = {};
v4_addr.s_addr = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
net_addr = CNetAddr{v4_addr};
} else if (network == Network::NET_IPV6) {
if (fuzzed_data_provider.remaining_bytes() >= 16) {
in6_addr v6_addr = {};
memcpy(v6_addr.s6_addr, fuzzed_data_provider.ConsumeBytes<uint8_t>(16).data(), 16);
net_addr = CNetAddr{v6_addr, fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
}
} else if (network == Network::NET_INTERNAL) {
net_addr.SetInternal(fuzzed_data_provider.ConsumeBytesAsString(32));
} else if (network == Network::NET_ONION) {
auto pub_key{fuzzed_data_provider.ConsumeBytes<uint8_t>(ADDR_TORV3_SIZE)};
pub_key.resize(ADDR_TORV3_SIZE);
const bool ok{net_addr.SetSpecial(OnionToString(pub_key))};
assert(ok);
}
return net_addr;
}
CAddress ConsumeAddress(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
return {ConsumeService(fuzzed_data_provider), ConsumeWeakEnum(fuzzed_data_provider, ALL_SERVICE_FLAGS), NodeSeconds{std::chrono::seconds{fuzzed_data_provider.ConsumeIntegral<uint32_t>()}}};
}
template <typename P>
P ConsumeDeserializationParams(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
constexpr std::array ADDR_ENCODINGS{
CNetAddr::Encoding::V1,
CNetAddr::Encoding::V2,
};
constexpr std::array ADDR_FORMATS{
CAddress::Format::Disk,
CAddress::Format::Network,
};
if constexpr (std::is_same_v<P, CNetAddr::SerParams>) {
return P{PickValue(fuzzed_data_provider, ADDR_ENCODINGS)};
}
if constexpr (std::is_same_v<P, CAddress::SerParams>) {
return P{{PickValue(fuzzed_data_provider, ADDR_ENCODINGS)}, PickValue(fuzzed_data_provider, ADDR_FORMATS)};
}
}
template CNetAddr::SerParams ConsumeDeserializationParams(FuzzedDataProvider&) noexcept;
template CAddress::SerParams ConsumeDeserializationParams(FuzzedDataProvider&) noexcept;
FuzzedSock::FuzzedSock(FuzzedDataProvider& fuzzed_data_provider)
: m_fuzzed_data_provider{fuzzed_data_provider}, m_selectable{fuzzed_data_provider.ConsumeBool()}
{
m_socket = fuzzed_data_provider.ConsumeIntegralInRange<SOCKET>(INVALID_SOCKET - 1, INVALID_SOCKET);
}
FuzzedSock::~FuzzedSock()
{
// Sock::~Sock() will be called after FuzzedSock::~FuzzedSock() and it will call
// close(m_socket) if m_socket is not INVALID_SOCKET.
// Avoid closing an arbitrary file descriptor (m_socket is just a random very high number which
// theoretically may concide with a real opened file descriptor).
m_socket = INVALID_SOCKET;
}
FuzzedSock& FuzzedSock::operator=(Sock&& other)
{
assert(false && "Move of Sock into FuzzedSock not allowed.");
return *this;
}
ssize_t FuzzedSock::Send(const void* data, size_t len, int flags) const
{
constexpr std::array send_errnos{
EACCES,
EAGAIN,
EALREADY,
EBADF,
ECONNRESET,
EDESTADDRREQ,
EFAULT,
EINTR,
EINVAL,
EISCONN,
EMSGSIZE,
ENOBUFS,
ENOMEM,
ENOTCONN,
ENOTSOCK,
EOPNOTSUPP,
EPIPE,
EWOULDBLOCK,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
return len;
}
const ssize_t r = m_fuzzed_data_provider.ConsumeIntegralInRange<ssize_t>(-1, len);
if (r == -1) {
SetFuzzedErrNo(m_fuzzed_data_provider, send_errnos);
}
return r;
}
ssize_t FuzzedSock::Recv(void* buf, size_t len, int flags) const
{
// Have a permanent error at recv_errnos[0] because when the fuzzed data is exhausted
// SetFuzzedErrNo() will always return the first element and we want to avoid Recv()
// returning -1 and setting errno to EAGAIN repeatedly.
constexpr std::array recv_errnos{
ECONNREFUSED,
EAGAIN,
EBADF,
EFAULT,
EINTR,
EINVAL,
ENOMEM,
ENOTCONN,
ENOTSOCK,
EWOULDBLOCK,
};
assert(buf != nullptr || len == 0);
if (len == 0 || m_fuzzed_data_provider.ConsumeBool()) {
const ssize_t r = m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
if (r == -1) {
SetFuzzedErrNo(m_fuzzed_data_provider, recv_errnos);
}
return r;
}
std::vector<uint8_t> random_bytes;
bool pad_to_len_bytes{m_fuzzed_data_provider.ConsumeBool()};
if (m_peek_data.has_value()) {
// `MSG_PEEK` was used in the preceding `Recv()` call, return `m_peek_data`.
random_bytes.assign({m_peek_data.value()});
if ((flags & MSG_PEEK) == 0) {
m_peek_data.reset();
}
pad_to_len_bytes = false;
} else if ((flags & MSG_PEEK) != 0) {
// New call with `MSG_PEEK`.
random_bytes = m_fuzzed_data_provider.ConsumeBytes<uint8_t>(1);
if (!random_bytes.empty()) {
m_peek_data = random_bytes[0];
pad_to_len_bytes = false;
}
} else {
random_bytes = m_fuzzed_data_provider.ConsumeBytes<uint8_t>(
m_fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, len));
}
if (random_bytes.empty()) {
const ssize_t r = m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
if (r == -1) {
SetFuzzedErrNo(m_fuzzed_data_provider, recv_errnos);
}
return r;
}
std::memcpy(buf, random_bytes.data(), random_bytes.size());
if (pad_to_len_bytes) {
if (len > random_bytes.size()) {
std::memset((char*)buf + random_bytes.size(), 0, len - random_bytes.size());
}
return len;
}
if (m_fuzzed_data_provider.ConsumeBool() && std::getenv("FUZZED_SOCKET_FAKE_LATENCY") != nullptr) {
std::this_thread::sleep_for(std::chrono::milliseconds{2});
}
return random_bytes.size();
}
int FuzzedSock::Connect(const sockaddr*, socklen_t) const
{
// Have a permanent error at connect_errnos[0] because when the fuzzed data is exhausted
// SetFuzzedErrNo() will always return the first element and we want to avoid Connect()
// returning -1 and setting errno to EAGAIN repeatedly.
constexpr std::array connect_errnos{
ECONNREFUSED,
EAGAIN,
ECONNRESET,
EHOSTUNREACH,
EINPROGRESS,
EINTR,
ENETUNREACH,
ETIMEDOUT,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, connect_errnos);
return -1;
}
return 0;
}
int FuzzedSock::Bind(const sockaddr*, socklen_t) const
{
// Have a permanent error at bind_errnos[0] because when the fuzzed data is exhausted
// SetFuzzedErrNo() will always set the global errno to bind_errnos[0]. We want to
// avoid this method returning -1 and setting errno to a temporary error (like EAGAIN)
// repeatedly because proper code should retry on temporary errors, leading to an
// infinite loop.
constexpr std::array bind_errnos{
EACCES,
EADDRINUSE,
EADDRNOTAVAIL,
EAGAIN,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, bind_errnos);
return -1;
}
return 0;
}
int FuzzedSock::Listen(int) const
{
// Have a permanent error at listen_errnos[0] because when the fuzzed data is exhausted
// SetFuzzedErrNo() will always set the global errno to listen_errnos[0]. We want to
// avoid this method returning -1 and setting errno to a temporary error (like EAGAIN)
// repeatedly because proper code should retry on temporary errors, leading to an
// infinite loop.
constexpr std::array listen_errnos{
EADDRINUSE,
EINVAL,
EOPNOTSUPP,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, listen_errnos);
return -1;
}
return 0;
}
std::unique_ptr<Sock> FuzzedSock::Accept(sockaddr* addr, socklen_t* addr_len) const
{
constexpr std::array accept_errnos{
ECONNABORTED,
EINTR,
ENOMEM,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, accept_errnos);
return std::unique_ptr<FuzzedSock>();
}
return std::make_unique<FuzzedSock>(m_fuzzed_data_provider);
}
int FuzzedSock::GetSockOpt(int level, int opt_name, void* opt_val, socklen_t* opt_len) const
{
constexpr std::array getsockopt_errnos{
ENOMEM,
ENOBUFS,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, getsockopt_errnos);
return -1;
}
if (opt_val == nullptr) {
return 0;
}
std::memcpy(opt_val,
ConsumeFixedLengthByteVector(m_fuzzed_data_provider, *opt_len).data(),
*opt_len);
return 0;
}
int FuzzedSock::SetSockOpt(int, int, const void*, socklen_t) const
{
constexpr std::array setsockopt_errnos{
ENOMEM,
ENOBUFS,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, setsockopt_errnos);
return -1;
}
return 0;
}
int FuzzedSock::GetSockName(sockaddr* name, socklen_t* name_len) const
{
constexpr std::array getsockname_errnos{
ECONNRESET,
ENOBUFS,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, getsockname_errnos);
return -1;
}
*name_len = m_fuzzed_data_provider.ConsumeData(name, *name_len);
return 0;
}
bool FuzzedSock::SetNonBlocking() const
{
constexpr std::array setnonblocking_errnos{
EBADF,
EPERM,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, setnonblocking_errnos);
return false;
}
return true;
}
bool FuzzedSock::IsSelectable() const
{
return m_selectable;
}
bool FuzzedSock::Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred) const
{
constexpr std::array wait_errnos{
EBADF,
EINTR,
EINVAL,
};
if (m_fuzzed_data_provider.ConsumeBool()) {
SetFuzzedErrNo(m_fuzzed_data_provider, wait_errnos);
return false;
}
if (occurred != nullptr) {
*occurred = m_fuzzed_data_provider.ConsumeBool() ? requested : 0;
}
return true;
}
bool FuzzedSock::WaitMany(std::chrono::milliseconds timeout, EventsPerSock& events_per_sock) const
{
for (auto& [sock, events] : events_per_sock) {
(void)sock;
events.occurred = m_fuzzed_data_provider.ConsumeBool() ? events.requested : 0;
}
return true;
}
bool FuzzedSock::IsConnected(std::string& errmsg) const
{
if (m_fuzzed_data_provider.ConsumeBool()) {
return true;
}
errmsg = "disconnected at random by the fuzzer";
return false;
}
void FillNode(FuzzedDataProvider& fuzzed_data_provider, ConnmanTestMsg& connman, CNode& node) noexcept
{
connman.Handshake(node,
/*successfully_connected=*/fuzzed_data_provider.ConsumeBool(),
/*remote_services=*/ConsumeWeakEnum(fuzzed_data_provider, ALL_SERVICE_FLAGS),
/*local_services=*/ConsumeWeakEnum(fuzzed_data_provider, ALL_SERVICE_FLAGS),
/*version=*/fuzzed_data_provider.ConsumeIntegralInRange<int32_t>(MIN_PEER_PROTO_VERSION, std::numeric_limits<int32_t>::max()),
/*relay_txs=*/fuzzed_data_provider.ConsumeBool());
}
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