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[network] Error handling reform 

`network.cpp` has several error paths which either:
- report "Unhandled host socket error=n" and return `SUCCESS`, or
- switch on a few possible errors, log them, and translate them to
  Errno; the same switch statement is copied and pasted in multiple
  places in the code

Convert these paths to use a helper function `GetAndLogLastError`, which
is roughly the equivalent of one of the switch statements, but:
- handling more cases (both ones that were already in `Errno`, and a few
  more I added), and
- using OS functions to convert the error to a string when logging, so
  it'll describe the error even if it's not one of the ones in the
  switch statement.
  - To handle this, refactor the logic in `GetLastErrorMsg` to expose a
    new function `NativeErrorToString` which takes the error number
    explicitly as an argument.  And improve the Windows version a bit.

Also, add a test which exercises two random error paths.
This commit is contained in:
comex 2021-01-24 15:17:02 -05:00
parent 9e9341f4b4
commit 2910aa77b2
6 changed files with 147 additions and 111 deletions
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6
src/common/common_funcs.h
View File

@ -52,9 +52,13 @@ __declspec(dllimport) void __stdcall DebugBreak(void);
// Generic function to get last error message.
// Call directly after the command or use the error num.
// This function might change the error code.
// Defined in Misc.cpp.
// Defined in misc.cpp.
[[nodiscard]] std::string GetLastErrorMsg();
// Like GetLastErrorMsg(), but passing an explicit error code.
// Defined in misc.cpp.
[[nodiscard]] std::string NativeErrorToString(int e);
#define DECLARE_ENUM_FLAG_OPERATORS(type) \
[[nodiscard]] constexpr type operator|(type a, type b) noexcept { \
using T = std::underlying_type_t<type>; \

44
src/common/misc.cpp
View File

@ -12,27 +12,41 @@
#include "common/common_funcs.h"
// Generic function to get last error message.
// Call directly after the command or use the error num.
// This function might change the error code.
std::string GetLastErrorMsg() {
static constexpr std::size_t buff_size = 255;
char err_str[buff_size];
std::string NativeErrorToString(int e) {
#ifdef _WIN32
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), err_str, buff_size, nullptr);
return std::string(err_str, buff_size);
#elif defined(__GLIBC__) && (_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
LPSTR err_str;
DWORD res = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, e, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPSTR>(&err_str), 1, nullptr);
if (!res) {
return "(FormatMessageA failed to format error)";
}
std::string ret(err_str);
LocalFree(err_str);
return ret;
#else
char err_str[255];
#if defined(__GLIBC__) && (_GNU_SOURCE || (_POSIX_C_SOURCE < 200112L && _XOPEN_SOURCE < 600))
// Thread safe (GNU-specific)
const char* str = strerror_r(errno, err_str, buff_size);
const char* str = strerror_r(e, err_str, sizeof(err_str));
return std::string(str);
#else
// Thread safe (XSI-compliant)
const int success = strerror_r(errno, err_str, buff_size);
if (success != 0) {
return {};
int second_err = strerror_r(e, err_str, sizeof(err_str));
if (second_err != 0) {
return "(strerror_r failed to format error)";
}
return std::string(err_str);
#endif // GLIBC etc.
#endif // _WIN32
}
std::string GetLastErrorMsg() {
#ifdef _WIN32
return NativeErrorToString(GetLastError());
#else
return NativeErrorToString(errno);
#endif
}

173
src/core/network/network.cpp
View File

@ -7,6 +7,7 @@
#include <limits>
#include <utility>
#include <vector>
#include "common/common_funcs.h"
#ifdef _WIN32
#define _WINSOCK_DEPRECATED_NO_WARNINGS // gethostname
@ -90,15 +91,36 @@ LINGER MakeLinger(bool enable, u32 linger_value) {
return value;
}
int LastError() {
return WSAGetLastError();
}
bool EnableNonBlock(SOCKET fd, bool enable) {
u_long value = enable ? 1 : 0;
return ioctlsocket(fd, FIONBIO, &value) != SOCKET_ERROR;
}
Errno TranslateNativeError(int e) {
switch (e) {
case WSAEBADF:
return Errno::BADF;
case WSAEINVAL:
return Errno::INVAL;
case WSAEMFILE:
return Errno::MFILE;
case WSAENOTCONN:
return Errno::NOTCONN;
case WSAEWOULDBLOCK:
return Errno::AGAIN;
case WSAECONNREFUSED:
return Errno::CONNREFUSED;
case WSAEHOSTUNREACH:
return Errno::HOSTUNREACH;
case WSAENETDOWN:
return Errno::NETDOWN;
case WSAENETUNREACH:
return Errno::NETUNREACH;
default:
return Errno::OTHER;
}
}
#elif YUZU_UNIX // ^ _WIN32 v YUZU_UNIX
using SOCKET = int;
@ -108,9 +130,6 @@ using ULONG = u64;
constexpr SOCKET INVALID_SOCKET = -1;
constexpr SOCKET SOCKET_ERROR = -1;
constexpr int WSAEWOULDBLOCK = EAGAIN;
constexpr int WSAENOTCONN = ENOTCONN;
constexpr int SD_RECEIVE = SHUT_RD;
constexpr int SD_SEND = SHUT_WR;
constexpr int SD_BOTH = SHUT_RDWR;
@ -162,10 +181,6 @@ linger MakeLinger(bool enable, u32 linger_value) {
return value;
}
int LastError() {
return errno;
}
bool EnableNonBlock(int fd, bool enable) {
int flags = fcntl(fd, F_GETFD);
if (flags == -1) {
@ -179,8 +194,43 @@ bool EnableNonBlock(int fd, bool enable) {
return fcntl(fd, F_SETFD, flags) == 0;
}
Errno TranslateNativeError(int e) {
switch (e) {
case EBADF:
return Errno::BADF;
case EINVAL:
return Errno::INVAL;
case EMFILE:
return Errno::MFILE;
case ENOTCONN:
return Errno::NOTCONN;
case EAGAIN:
return Errno::AGAIN;
case ECONNREFUSED:
return Errno::CONNREFUSED;
case EHOSTUNREACH:
return Errno::HOSTUNREACH;
case ENETDOWN:
return Errno::NETDOWN;
case ENETUNREACH:
return Errno::NETUNREACH;
default:
return Errno::OTHER;
}
}
#endif
Errno GetAndLogLastError() {
#ifdef _WIN32
int e = WSAGetLastError();
#else
int e = errno;
#endif
LOG_ERROR(Network, "Socket operation error: {}", NativeErrorToString(e));
return TranslateNativeError(e);
}
int TranslateDomain(Domain domain) {
switch (domain) {
case Domain::INET:
@ -290,9 +340,7 @@ Errno SetSockOpt(SOCKET fd, int option, T value) {
if (result != SOCKET_ERROR) {
return Errno::SUCCESS;
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
return GetAndLogLastError();
}
} // Anonymous namespace
@ -308,14 +356,12 @@ NetworkInstance::~NetworkInstance() {
std::pair<IPv4Address, Errno> GetHostIPv4Address() {
std::array<char, 256> name{};
if (gethostname(name.data(), static_cast<int>(name.size()) - 1) == SOCKET_ERROR) {
UNIMPLEMENTED_MSG("Unhandled gethostname error");
return {IPv4Address{}, Errno::SUCCESS};
return {IPv4Address{}, GetAndLogLastError()};
}
hostent* const ent = gethostbyname(name.data());
if (!ent) {
UNIMPLEMENTED_MSG("Unhandled gethostbyname error");
return {IPv4Address{}, Errno::SUCCESS};
return {IPv4Address{}, GetAndLogLastError()};
}
if (ent->h_addr_list == nullptr) {
UNIMPLEMENTED_MSG("No addr provided in hostent->h_addr_list");
@ -359,9 +405,7 @@ std::pair<s32, Errno> Poll(std::vector<PollFD>& pollfds, s32 timeout) {
ASSERT(result == SOCKET_ERROR);
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {-1, Errno::SUCCESS};
return {-1, GetAndLogLastError()};
}
Socket::~Socket() {
@ -380,9 +424,7 @@ Errno Socket::Initialize(Domain domain, Type type, Protocol protocol) {
return Errno::SUCCESS;
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
return GetAndLogLastError();
}
std::pair<Socket::AcceptResult, Errno> Socket::Accept() {
@ -391,9 +433,7 @@ std::pair<Socket::AcceptResult, Errno> Socket::Accept() {
const SOCKET new_socket = accept(fd, &addr, &addrlen);
if (new_socket == INVALID_SOCKET) {
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {AcceptResult{}, Errno::SUCCESS};
return {AcceptResult{}, GetAndLogLastError()};
}
AcceptResult result;
@ -412,23 +452,14 @@ Errno Socket::Connect(SockAddrIn addr_in) {
return Errno::SUCCESS;
}
switch (const int ec = LastError()) {
case WSAEWOULDBLOCK:
LOG_DEBUG(Service, "EAGAIN generated");
return Errno::AGAIN;
default:
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
}
return GetAndLogLastError();
}
std::pair<SockAddrIn, Errno> Socket::GetPeerName() {
sockaddr addr;
socklen_t addrlen = sizeof(addr);
if (getpeername(fd, &addr, &addrlen) == SOCKET_ERROR) {
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {SockAddrIn{}, Errno::SUCCESS};
return {SockAddrIn{}, GetAndLogLastError()};
}
ASSERT(addrlen == sizeof(sockaddr_in));
@ -439,9 +470,7 @@ std::pair<SockAddrIn, Errno> Socket::GetSockName() {
sockaddr addr;
socklen_t addrlen = sizeof(addr);
if (getsockname(fd, &addr, &addrlen) == SOCKET_ERROR) {
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {SockAddrIn{}, Errno::SUCCESS};
return {SockAddrIn{}, GetAndLogLastError()};
}
ASSERT(addrlen == sizeof(sockaddr_in));
@ -454,9 +483,7 @@ Errno Socket::Bind(SockAddrIn addr) {
return Errno::SUCCESS;
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
return GetAndLogLastError();
}
Errno Socket::Listen(s32 backlog) {
@ -464,9 +491,7 @@ Errno Socket::Listen(s32 backlog) {
return Errno::SUCCESS;
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
return GetAndLogLastError();
}
Errno Socket::Shutdown(ShutdownHow how) {
@ -489,14 +514,7 @@ Errno Socket::Shutdown(ShutdownHow how) {
return Errno::SUCCESS;
}
switch (const int ec = LastError()) {
case WSAENOTCONN:
LOG_ERROR(Service, "ENOTCONN generated");
return Errno::NOTCONN;
default:
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
}
return GetAndLogLastError();
}
std::pair<s32, Errno> Socket::Recv(int flags, std::vector<u8>& message) {
@ -509,17 +527,7 @@ std::pair<s32, Errno> Socket::Recv(int flags, std::vector<u8>& message) {
return {static_cast<s32>(result), Errno::SUCCESS};
}
switch (const int ec = LastError()) {
case WSAEWOULDBLOCK:
LOG_DEBUG(Service, "EAGAIN generated");
return {-1, Errno::AGAIN};
case WSAENOTCONN:
LOG_ERROR(Service, "ENOTCONN generated");
return {-1, Errno::NOTCONN};
default:
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {0, Errno::SUCCESS};
}
return {-1, GetAndLogLastError()};
}
std::pair<s32, Errno> Socket::RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) {
@ -541,17 +549,7 @@ std::pair<s32, Errno> Socket::RecvFrom(int flags, std::vector<u8>& message, Sock
return {static_cast<s32>(result), Errno::SUCCESS};
}
switch (const int ec = LastError()) {
case WSAEWOULDBLOCK:
LOG_DEBUG(Service, "EAGAIN generated");
return {-1, Errno::AGAIN};
case WSAENOTCONN:
LOG_ERROR(Service, "ENOTCONN generated");
return {-1, Errno::NOTCONN};
default:
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {-1, Errno::SUCCESS};
}
return {-1, GetAndLogLastError()};
}
std::pair<s32, Errno> Socket::Send(const std::vector<u8>& message, int flags) {
@ -564,18 +562,7 @@ std::pair<s32, Errno> Socket::Send(const std::vector<u8>& message, int flags) {
return {static_cast<s32>(result), Errno::SUCCESS};
}
const int ec = LastError();
switch (ec) {
case WSAEWOULDBLOCK:
LOG_DEBUG(Service, "EAGAIN generated");
return {-1, Errno::AGAIN};
case WSAENOTCONN:
LOG_ERROR(Service, "ENOTCONN generated");
return {-1, Errno::NOTCONN};
default:
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {-1, Errno::SUCCESS};
}
return {-1, GetAndLogLastError()};
}
std::pair<s32, Errno> Socket::SendTo(u32 flags, const std::vector<u8>& message,
@ -597,9 +584,7 @@ std::pair<s32, Errno> Socket::SendTo(u32 flags, const std::vector<u8>& message,
return {static_cast<s32>(result), Errno::SUCCESS};
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return {-1, Errno::SUCCESS};
return {-1, GetAndLogLastError()};
}
Errno Socket::Close() {
@ -642,9 +627,7 @@ Errno Socket::SetNonBlock(bool enable) {
if (EnableNonBlock(fd, enable)) {
return Errno::SUCCESS;
}
const int ec = LastError();
UNREACHABLE_MSG("Unhandled host socket error={}", ec);
return Errno::SUCCESS;
return GetAndLogLastError();
}
bool Socket::IsOpened() const {

6
src/core/network/network.h
View File

@ -7,6 +7,7 @@
#include <array>
#include <utility>
#include "common/common_funcs.h"
#include "common/common_types.h"
namespace Network {
@ -21,6 +22,11 @@ enum class Errno {
MFILE,
NOTCONN,
AGAIN,
CONNREFUSED,
HOSTUNREACH,
NETDOWN,
NETUNREACH,
OTHER,
};
/// Address families

1
src/tests/CMakeLists.txt
View File

@ -5,6 +5,7 @@ add_executable(tests
common/param_package.cpp
common/ring_buffer.cpp
core/core_timing.cpp
core/network/network.cpp
tests.cpp
video_core/buffer_base.cpp
)

28
src/tests/core/network/network.cpp Normal file
View File

@ -0,0 +1,28 @@
// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <catch2/catch.hpp>
#include "core/network/network.h"
#include "core/network/sockets.h"
TEST_CASE("Network::Errors", "[core]") {
Network::NetworkInstance network_instance; // initialize network
Network::Socket socks[2];
for (Network::Socket& sock : socks) {
REQUIRE(sock.Initialize(Network::Domain::INET, Network::Type::STREAM,
Network::Protocol::TCP) == Network::Errno::SUCCESS);
}
Network::SockAddrIn addr{
Network::Domain::INET,
{127, 0, 0, 1},
1, // hopefully nobody running this test has something listening on port 1
};
REQUIRE(socks[0].Connect(addr) == Network::Errno::CONNREFUSED);
std::vector<u8> message{1, 2, 3, 4};
REQUIRE(socks[1].Recv(0, message).second == Network::Errno::NOTCONN);
}