5 files changed, 281 insertions, 73 deletions

diff --git a/src/core/internal_network/network.cpp b/src/core/internal_network/network.cpp
index 75ac10a9c..39381e06e 100644
--- a/src/core/internal_network/network.cpp
+++ b/src/core/internal_network/network.cpp
@@ -121,6 +121,8 @@ Errno TranslateNativeError(int e) {
         return Errno::MSGSIZE;
     case WSAETIMEDOUT:
         return Errno::TIMEDOUT;
+    case WSAEINPROGRESS:
+        return Errno::INPROGRESS;
     default:
         UNIMPLEMENTED_MSG("Unimplemented errno={}", e);
         return Errno::OTHER;
@@ -195,6 +197,8 @@ bool EnableNonBlock(int fd, bool enable) {
 
 Errno TranslateNativeError(int e) {
     switch (e) {
+    case 0:
+        return Errno::SUCCESS;
     case EBADF:
         return Errno::BADF;
     case EINVAL:
@@ -219,8 +223,10 @@ Errno TranslateNativeError(int e) {
         return Errno::MSGSIZE;
     case ETIMEDOUT:
         return Errno::TIMEDOUT;
+    case EINPROGRESS:
+        return Errno::INPROGRESS;
     default:
-        UNIMPLEMENTED_MSG("Unimplemented errno={}", e);
+        UNIMPLEMENTED_MSG("Unimplemented errno={} ({})", e, strerror(e));
         return Errno::OTHER;
     }
 }
@@ -234,15 +240,84 @@ Errno GetAndLogLastError() {
     int e = errno;
 #endif
     const Errno err = TranslateNativeError(e);
-    if (err == Errno::AGAIN || err == Errno::TIMEDOUT) {
+    if (err == Errno::AGAIN || err == Errno::TIMEDOUT || err == Errno::INPROGRESS) {
+        // These happen during normal operation, so only log them at debug level.
+        LOG_DEBUG(Network, "Socket operation error: {}", Common::NativeErrorToString(e));
         return err;
     }
     LOG_ERROR(Network, "Socket operation error: {}", Common::NativeErrorToString(e));
     return err;
 }
 
-int TranslateDomain(Domain domain) {
+GetAddrInfoError TranslateGetAddrInfoErrorFromNative(int gai_err) {
+    switch (gai_err) {
+    case 0:
+        return GetAddrInfoError::SUCCESS;
+#ifdef EAI_ADDRFAMILY
+    case EAI_ADDRFAMILY:
+        return GetAddrInfoError::ADDRFAMILY;
+#endif
+    case EAI_AGAIN:
+        return GetAddrInfoError::AGAIN;
+    case EAI_BADFLAGS:
+        return GetAddrInfoError::BADFLAGS;
+    case EAI_FAIL:
+        return GetAddrInfoError::FAIL;
+    case EAI_FAMILY:
+        return GetAddrInfoError::FAMILY;
+    case EAI_MEMORY:
+        return GetAddrInfoError::MEMORY;
+    case EAI_NONAME:
+        return GetAddrInfoError::NONAME;
+    case EAI_SERVICE:
+        return GetAddrInfoError::SERVICE;
+    case EAI_SOCKTYPE:
+        return GetAddrInfoError::SOCKTYPE;
+        // These codes may not be defined on all systems:
+#ifdef EAI_SYSTEM
+    case EAI_SYSTEM:
+        return GetAddrInfoError::SYSTEM;
+#endif
+#ifdef EAI_BADHINTS
+    case EAI_BADHINTS:
+        return GetAddrInfoError::BADHINTS;
+#endif
+#ifdef EAI_PROTOCOL
+    case EAI_PROTOCOL:
+        return GetAddrInfoError::PROTOCOL;
+#endif
+#ifdef EAI_OVERFLOW
+    case EAI_OVERFLOW:
+        return GetAddrInfoError::OVERFLOW_;
+#endif
+    default:
+#ifdef EAI_NODATA
+        // This can't be a case statement because it would create a duplicate
+        // case on Windows where EAI_NODATA is an alias for EAI_NONAME.
+        if (gai_err == EAI_NODATA) {
+            return GetAddrInfoError::NODATA;
+        }
+#endif
+        return GetAddrInfoError::OTHER;
+    }
+}
+
+Domain TranslateDomainFromNative(int domain) {
     switch (domain) {
+    case 0:
+        return Domain::Unspecified;
+    case AF_INET:
+        return Domain::INET;
+    default:
+        UNIMPLEMENTED_MSG("Unhandled domain={}", domain);
+        return Domain::INET;
+    }
+}
+
+int TranslateDomainToNative(Domain domain) {
+    switch (domain) {
+    case Domain::Unspecified:
+        return 0;
     case Domain::INET:
         return AF_INET;
     default:
@@ -251,20 +326,58 @@ int TranslateDomain(Domain domain) {
     }
 }
 
-int TranslateType(Type type) {
+Type TranslateTypeFromNative(int type) {
+    switch (type) {
+    case 0:
+        return Type::Unspecified;
+    case SOCK_STREAM:
+        return Type::STREAM;
+    case SOCK_DGRAM:
+        return Type::DGRAM;
+    case SOCK_RAW:
+        return Type::RAW;
+    case SOCK_SEQPACKET:
+        return Type::SEQPACKET;
+    default:
+        UNIMPLEMENTED_MSG("Unimplemented type={}", type);
+        return Type::STREAM;
+    }
+}
+
+int TranslateTypeToNative(Type type) {
     switch (type) {
+    case Type::Unspecified:
+        return 0;
     case Type::STREAM:
         return SOCK_STREAM;
     case Type::DGRAM:
         return SOCK_DGRAM;
+    case Type::RAW:
+        return SOCK_RAW;
     default:
         UNIMPLEMENTED_MSG("Unimplemented type={}", type);
         return 0;
     }
 }
 
-int TranslateProtocol(Protocol protocol) {
+Protocol TranslateProtocolFromNative(int protocol) {
+    switch (protocol) {
+    case 0:
+        return Protocol::Unspecified;
+    case IPPROTO_TCP:
+        return Protocol::TCP;
+    case IPPROTO_UDP:
+        return Protocol::UDP;
+    default:
+        UNIMPLEMENTED_MSG("Unimplemented protocol={}", protocol);
+        return Protocol::Unspecified;
+    }
+}
+
+int TranslateProtocolToNative(Protocol protocol) {
     switch (protocol) {
+    case Protocol::Unspecified:
+        return 0;
     case Protocol::TCP:
         return IPPROTO_TCP;
     case Protocol::UDP:
@@ -275,21 +388,10 @@ int TranslateProtocol(Protocol protocol) {
     }
 }
 
-SockAddrIn TranslateToSockAddrIn(sockaddr input_) {
-    sockaddr_in input;
-    std::memcpy(&input, &input_, sizeof(input));
-
+SockAddrIn TranslateToSockAddrIn(sockaddr_in input, size_t input_len) {
     SockAddrIn result;
 
-    switch (input.sin_family) {
-    case AF_INET:
-        result.family = Domain::INET;
-        break;
-    default:
-        UNIMPLEMENTED_MSG("Unhandled sockaddr family={}", input.sin_family);
-        result.family = Domain::INET;
-        break;
-    }
+    result.family = TranslateDomainFromNative(input.sin_family);
 
     result.portno = ntohs(input.sin_port);
 
@@ -301,22 +403,28 @@ SockAddrIn TranslateToSockAddrIn(sockaddr input_) {
 short TranslatePollEvents(PollEvents events) {
     short result = 0;
 
-    if (True(events & PollEvents::In)) {
-        events &= ~PollEvents::In;
-        result |= POLLIN;
-    }
-    if (True(events & PollEvents::Pri)) {
-        events &= ~PollEvents::Pri;
+    const auto translate = [&result, &events](PollEvents guest, short host) {
+        if (True(events & guest)) {
+            events &= ~guest;
+            result |= host;
+        }
+    };
+
+    translate(PollEvents::In, POLLIN);
+    translate(PollEvents::Pri, POLLPRI);
+    translate(PollEvents::Out, POLLOUT);
+    translate(PollEvents::Err, POLLERR);
+    translate(PollEvents::Hup, POLLHUP);
+    translate(PollEvents::Nval, POLLNVAL);
+    translate(PollEvents::RdNorm, POLLRDNORM);
+    translate(PollEvents::RdBand, POLLRDBAND);
+    translate(PollEvents::WrBand, POLLWRBAND);
+
 #ifdef _WIN32
+    if (True(events & PollEvents::Pri)) {
         LOG_WARNING(Service, "Winsock doesn't support POLLPRI");
-#else
-        result |= POLLPRI;
-#endif
-    }
-    if (True(events & PollEvents::Out)) {
-        events &= ~PollEvents::Out;
-        result |= POLLOUT;
     }
+#endif
 
     UNIMPLEMENTED_IF_MSG((u16)events != 0, "Unhandled guest events=0x{:x}", (u16)events);
 
@@ -337,6 +445,10 @@ PollEvents TranslatePollRevents(short revents) {
     translate(POLLOUT, PollEvents::Out);
     translate(POLLERR, PollEvents::Err);
     translate(POLLHUP, PollEvents::Hup);
+    translate(POLLNVAL, PollEvents::Nval);
+    translate(POLLRDNORM, PollEvents::RdNorm);
+    translate(POLLRDBAND, PollEvents::RdBand);
+    translate(POLLWRBAND, PollEvents::WrBand);
 
     UNIMPLEMENTED_IF_MSG(revents != 0, "Unhandled host revents=0x{:x}", revents);
 
@@ -360,12 +472,53 @@ std::optional<IPv4Address> GetHostIPv4Address() {
         return {};
     }
 
-    std::array<char, 16> ip_addr = {};
-    ASSERT(inet_ntop(AF_INET, &network_interface->ip_address, ip_addr.data(), sizeof(ip_addr)) !=
-           nullptr);
     return TranslateIPv4(network_interface->ip_address);
 }
 
+std::string IPv4AddressToString(IPv4Address ip_addr) {
+    std::array<char, INET_ADDRSTRLEN> buf = {};
+    ASSERT(inet_ntop(AF_INET, &ip_addr, buf.data(), sizeof(buf)) == buf.data());
+    return std::string(buf.data());
+}
+
+u32 IPv4AddressToInteger(IPv4Address ip_addr) {
+    return static_cast<u32>(ip_addr[0]) << 24 | static_cast<u32>(ip_addr[1]) << 16 |
+           static_cast<u32>(ip_addr[2]) << 8 | static_cast<u32>(ip_addr[3]);
+}
+
+#undef GetAddrInfo // Windows defines it as a macro
+
+Common::Expected<std::vector<AddrInfo>, GetAddrInfoError> GetAddrInfo(
+    const std::string& host, const std::optional<std::string>& service) {
+    addrinfo hints{};
+    hints.ai_family = AF_INET; // Switch only supports IPv4.
+    addrinfo* addrinfo;
+    s32 gai_err = getaddrinfo(host.c_str(), service.has_value() ? service->c_str() : nullptr,
+                              &hints, &addrinfo);
+    if (gai_err != 0) {
+        return Common::Unexpected(TranslateGetAddrInfoErrorFromNative(gai_err));
+    }
+    std::vector<AddrInfo> ret;
+    for (auto* current = addrinfo; current; current = current->ai_next) {
+        // We should only get AF_INET results due to the hints value.
+        ASSERT_OR_EXECUTE(addrinfo->ai_family == AF_INET &&
+                              addrinfo->ai_addrlen == sizeof(sockaddr_in),
+                          continue;);
+
+        AddrInfo& out = ret.emplace_back();
+        out.family = TranslateDomainFromNative(current->ai_family);
+        out.socket_type = TranslateTypeFromNative(current->ai_socktype);
+        out.protocol = TranslateProtocolFromNative(current->ai_protocol);
+        out.addr = TranslateToSockAddrIn(*reinterpret_cast<sockaddr_in*>(current->ai_addr),
+                                         current->ai_addrlen);
+        if (current->ai_canonname != nullptr) {
+            out.canon_name = current->ai_canonname;
+        }
+    }
+    freeaddrinfo(addrinfo);
+    return ret;
+}
+
 std::pair<s32, Errno> Poll(std::vector<PollFD>& pollfds, s32 timeout) {
     const size_t num = pollfds.size();
 
@@ -411,6 +564,18 @@ Socket::Socket(Socket&& rhs) noexcept {
 }
 
 template <typename T>
+std::pair<T, Errno> Socket::GetSockOpt(SOCKET fd_, int option) {
+    T value{};
+    socklen_t len = sizeof(value);
+    const int result = getsockopt(fd_, SOL_SOCKET, option, reinterpret_cast<char*>(&value), &len);
+    if (result != SOCKET_ERROR) {
+        ASSERT(len == sizeof(value));
+        return {value, Errno::SUCCESS};
+    }
+    return {value, GetAndLogLastError()};
+}
+
+template <typename T>
 Errno Socket::SetSockOpt(SOCKET fd_, int option, T value) {
     const int result =
         setsockopt(fd_, SOL_SOCKET, option, reinterpret_cast<const char*>(&value), sizeof(value));
@@ -421,7 +586,8 @@ Errno Socket::SetSockOpt(SOCKET fd_, int option, T value) {
 }
 
 Errno Socket::Initialize(Domain domain, Type type, Protocol protocol) {
-    fd = socket(TranslateDomain(domain), TranslateType(type), TranslateProtocol(protocol));
+    fd = socket(TranslateDomainToNative(domain), TranslateTypeToNative(type),
+                TranslateProtocolToNative(protocol));
     if (fd != INVALID_SOCKET) {
         return Errno::SUCCESS;
     }
@@ -430,19 +596,17 @@ Errno Socket::Initialize(Domain domain, Type type, Protocol protocol) {
 }
 
 std::pair<SocketBase::AcceptResult, Errno> Socket::Accept() {
-    sockaddr addr;
+    sockaddr_in addr;
     socklen_t addrlen = sizeof(addr);
-    const SOCKET new_socket = accept(fd, &addr, &addrlen);
+    const SOCKET new_socket = accept(fd, reinterpret_cast<sockaddr*>(&addr), &addrlen);
 
     if (new_socket == INVALID_SOCKET) {
         return {AcceptResult{}, GetAndLogLastError()};
     }
 
-    ASSERT(addrlen == sizeof(sockaddr_in));
-
     AcceptResult result{
         .socket = std::make_unique<Socket>(new_socket),
-        .sockaddr_in = TranslateToSockAddrIn(addr),
+        .sockaddr_in = TranslateToSockAddrIn(addr, addrlen),
     };
 
     return {std::move(result), Errno::SUCCESS};
@@ -458,25 +622,23 @@ Errno Socket::Connect(SockAddrIn addr_in) {
 }
 
 std::pair<SockAddrIn, Errno> Socket::GetPeerName() {
-    sockaddr addr;
+    sockaddr_in addr;
     socklen_t addrlen = sizeof(addr);
-    if (getpeername(fd, &addr, &addrlen) == SOCKET_ERROR) {
+    if (getpeername(fd, reinterpret_cast<sockaddr*>(&addr), &addrlen) == SOCKET_ERROR) {
         return {SockAddrIn{}, GetAndLogLastError()};
     }
 
-    ASSERT(addrlen == sizeof(sockaddr_in));
-    return {TranslateToSockAddrIn(addr), Errno::SUCCESS};
+    return {TranslateToSockAddrIn(addr, addrlen), Errno::SUCCESS};
 }
 
 std::pair<SockAddrIn, Errno> Socket::GetSockName() {
-    sockaddr addr;
+    sockaddr_in addr;
     socklen_t addrlen = sizeof(addr);
-    if (getsockname(fd, &addr, &addrlen) == SOCKET_ERROR) {
+    if (getsockname(fd, reinterpret_cast<sockaddr*>(&addr), &addrlen) == SOCKET_ERROR) {
         return {SockAddrIn{}, GetAndLogLastError()};
     }
 
-    ASSERT(addrlen == sizeof(sockaddr_in));
-    return {TranslateToSockAddrIn(addr), Errno::SUCCESS};
+    return {TranslateToSockAddrIn(addr, addrlen), Errno::SUCCESS};
 }
 
 Errno Socket::Bind(SockAddrIn addr) {
@@ -519,7 +681,7 @@ Errno Socket::Shutdown(ShutdownHow how) {
     return GetAndLogLastError();
 }
 
-std::pair<s32, Errno> Socket::Recv(int flags, std::vector<u8>& message) {
+std::pair<s32, Errno> Socket::Recv(int flags, std::span<u8> message) {
     ASSERT(flags == 0);
     ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
 
@@ -532,21 +694,20 @@ std::pair<s32, Errno> Socket::Recv(int flags, std::vector<u8>& message) {
     return {-1, GetAndLogLastError()};
 }
 
-std::pair<s32, Errno> Socket::RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) {
+std::pair<s32, Errno> Socket::RecvFrom(int flags, std::span<u8> message, SockAddrIn* addr) {
     ASSERT(flags == 0);
     ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
 
-    sockaddr addr_in{};
+    sockaddr_in addr_in{};
     socklen_t addrlen = sizeof(addr_in);
     socklen_t* const p_addrlen = addr ? &addrlen : nullptr;
-    sockaddr* const p_addr_in = addr ? &addr_in : nullptr;
+    sockaddr* const p_addr_in = addr ? reinterpret_cast<sockaddr*>(&addr_in) : nullptr;
 
     const auto result = recvfrom(fd, reinterpret_cast<char*>(message.data()),
                                  static_cast<int>(message.size()), 0, p_addr_in, p_addrlen);
     if (result != SOCKET_ERROR) {
         if (addr) {
-            ASSERT(addrlen == sizeof(addr_in));
-            *addr = TranslateToSockAddrIn(addr_in);
+            *addr = TranslateToSockAddrIn(addr_in, addrlen);
         }
         return {static_cast<s32>(result), Errno::SUCCESS};
     }
@@ -597,6 +758,11 @@ Errno Socket::Close() {
     return Errno::SUCCESS;
 }
 
+std::pair<Errno, Errno> Socket::GetPendingError() {
+    auto [pending_err, getsockopt_err] = GetSockOpt<int>(fd, SO_ERROR);
+    return {TranslateNativeError(pending_err), getsockopt_err};
+}
+
 Errno Socket::SetLinger(bool enable, u32 linger) {
     return SetSockOpt(fd, SO_LINGER, MakeLinger(enable, linger));
 }
diff --git a/src/core/internal_network/network.h b/src/core/internal_network/network.h
index 1e09a007a..96319bfc8 100644
--- a/src/core/internal_network/network.h
+++ b/src/core/internal_network/network.h
@@ -16,6 +16,11 @@
 #include <netinet/in.h>
 #endif
 
+namespace Common {
+template <typename T, typename E>
+class Expected;
+}
+
 namespace Network {
 
 class SocketBase;
@@ -36,6 +41,26 @@ enum class Errno {
     NETUNREACH,
     TIMEDOUT,
     MSGSIZE,
+    INPROGRESS,
+    OTHER,
+};
+
+enum class GetAddrInfoError {
+    SUCCESS,
+    ADDRFAMILY,
+    AGAIN,
+    BADFLAGS,
+    FAIL,
+    FAMILY,
+    MEMORY,
+    NODATA,
+    NONAME,
+    SERVICE,
+    SOCKTYPE,
+    SYSTEM,
+    BADHINTS,
+    PROTOCOL,
+    OVERFLOW_,
     OTHER,
 };
 
@@ -49,6 +74,9 @@ enum class PollEvents : u16 {
     Err = 1 << 3,
     Hup = 1 << 4,
     Nval = 1 << 5,
+    RdNorm = 1 << 6,
+    RdBand = 1 << 7,
+    WrBand = 1 << 8,
 };
 
 DECLARE_ENUM_FLAG_OPERATORS(PollEvents);
@@ -82,4 +110,10 @@ constexpr IPv4Address TranslateIPv4(in_addr addr) {
 /// @return human ordered IPv4 address (e.g. 192.168.0.1) as an array
 std::optional<IPv4Address> GetHostIPv4Address();
 
+std::string IPv4AddressToString(IPv4Address ip_addr);
+u32 IPv4AddressToInteger(IPv4Address ip_addr);
+
+Common::Expected<std::vector<AddrInfo>, GetAddrInfoError> GetAddrInfo(
+    const std::string& host, const std::optional<std::string>& service);
+
 } // namespace Network
diff --git a/src/core/internal_network/socket_proxy.cpp b/src/core/internal_network/socket_proxy.cpp
index 7a77171c2..44e9e3093 100644
--- a/src/core/internal_network/socket_proxy.cpp
+++ b/src/core/internal_network/socket_proxy.cpp
@@ -98,7 +98,7 @@ Errno ProxySocket::Shutdown(ShutdownHow how) {
     return Errno::SUCCESS;
 }
 
-std::pair<s32, Errno> ProxySocket::Recv(int flags, std::vector<u8>& message) {
+std::pair<s32, Errno> ProxySocket::Recv(int flags, std::span<u8> message) {
     LOG_WARNING(Network, "(STUBBED) called");
     ASSERT(flags == 0);
     ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
@@ -106,7 +106,7 @@ std::pair<s32, Errno> ProxySocket::Recv(int flags, std::vector<u8>& message) {
     return {static_cast<s32>(0), Errno::SUCCESS};
 }
 
-std::pair<s32, Errno> ProxySocket::RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) {
+std::pair<s32, Errno> ProxySocket::RecvFrom(int flags, std::span<u8> message, SockAddrIn* addr) {
     ASSERT(flags == 0);
     ASSERT(message.size() < static_cast<size_t>(std::numeric_limits<int>::max()));
 
@@ -140,8 +140,8 @@ std::pair<s32, Errno> ProxySocket::RecvFrom(int flags, std::vector<u8>& message,
     }
 }
 
-std::pair<s32, Errno> ProxySocket::ReceivePacket(int flags, std::vector<u8>& message,
-                                                 SockAddrIn* addr, std::size_t max_length) {
+std::pair<s32, Errno> ProxySocket::ReceivePacket(int flags, std::span<u8> message, SockAddrIn* addr,
+                                                 std::size_t max_length) {
     ProxyPacket& packet = received_packets.front();
     if (addr) {
         addr->family = Domain::INET;
@@ -153,10 +153,7 @@ std::pair<s32, Errno> ProxySocket::ReceivePacket(int flags, std::vector<u8>& mes
     std::size_t read_bytes;
     if (packet.data.size() > max_length) {
         read_bytes = max_length;
-        message.clear();
-        std::copy(packet.data.begin(), packet.data.begin() + read_bytes,
-                  std::back_inserter(message));
-        message.resize(max_length);
+        memcpy(message.data(), packet.data.data(), max_length);
 
         if (protocol == Protocol::UDP) {
             if (!peek) {
@@ -171,9 +168,7 @@ std::pair<s32, Errno> ProxySocket::ReceivePacket(int flags, std::vector<u8>& mes
         }
     } else {
         read_bytes = packet.data.size();
-        message.clear();
-        std::copy(packet.data.begin(), packet.data.end(), std::back_inserter(message));
-        message.resize(max_length);
+        memcpy(message.data(), packet.data.data(), read_bytes);
         if (!peek) {
             received_packets.pop();
         }
@@ -293,6 +288,11 @@ Errno ProxySocket::SetNonBlock(bool enable) {
     return Errno::SUCCESS;
 }
 
+std::pair<Errno, Errno> ProxySocket::GetPendingError() {
+    LOG_DEBUG(Network, "(STUBBED) called");
+    return {Errno::SUCCESS, Errno::SUCCESS};
+}
+
 bool ProxySocket::IsOpened() const {
     return fd != INVALID_SOCKET;
 }
diff --git a/src/core/internal_network/socket_proxy.h b/src/core/internal_network/socket_proxy.h
index 6e991fa38..e12c413d1 100644
--- a/src/core/internal_network/socket_proxy.h
+++ b/src/core/internal_network/socket_proxy.h
@@ -39,11 +39,11 @@ public:
 
     Errno Shutdown(ShutdownHow how) override;
 
-    std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) override;
+    std::pair<s32, Errno> Recv(int flags, std::span<u8> message) override;
 
-    std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) override;
+    std::pair<s32, Errno> RecvFrom(int flags, std::span<u8> message, SockAddrIn* addr) override;
 
-    std::pair<s32, Errno> ReceivePacket(int flags, std::vector<u8>& message, SockAddrIn* addr,
+    std::pair<s32, Errno> ReceivePacket(int flags, std::span<u8> message, SockAddrIn* addr,
                                         std::size_t max_length);
 
     std::pair<s32, Errno> Send(std::span<const u8> message, int flags) override;
@@ -74,6 +74,8 @@ public:
     template <typename T>
     Errno SetSockOpt(SOCKET fd, int option, T value);
 
+    std::pair<Errno, Errno> GetPendingError() override;
+
     bool IsOpened() const override;
 
 private:
diff --git a/src/core/internal_network/sockets.h b/src/core/internal_network/sockets.h
index 11e479e50..46a53ef79 100644
--- a/src/core/internal_network/sockets.h
+++ b/src/core/internal_network/sockets.h
@@ -59,10 +59,9 @@ public:
 
     virtual Errno Shutdown(ShutdownHow how) = 0;
 
-    virtual std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) = 0;
+    virtual std::pair<s32, Errno> Recv(int flags, std::span<u8> message) = 0;
 
-    virtual std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message,
-                                           SockAddrIn* addr) = 0;
+    virtual std::pair<s32, Errno> RecvFrom(int flags, std::span<u8> message, SockAddrIn* addr) = 0;
 
     virtual std::pair<s32, Errno> Send(std::span<const u8> message, int flags) = 0;
 
@@ -87,6 +86,8 @@ public:
 
     virtual Errno SetNonBlock(bool enable) = 0;
 
+    virtual std::pair<Errno, Errno> GetPendingError() = 0;
+
     virtual bool IsOpened() const = 0;
 
     virtual void HandleProxyPacket(const ProxyPacket& packet) = 0;
@@ -126,9 +127,9 @@ public:
 
     Errno Shutdown(ShutdownHow how) override;
 
-    std::pair<s32, Errno> Recv(int flags, std::vector<u8>& message) override;
+    std::pair<s32, Errno> Recv(int flags, std::span<u8> message) override;
 
-    std::pair<s32, Errno> RecvFrom(int flags, std::vector<u8>& message, SockAddrIn* addr) override;
+    std::pair<s32, Errno> RecvFrom(int flags, std::span<u8> message, SockAddrIn* addr) override;
 
     std::pair<s32, Errno> Send(std::span<const u8> message, int flags) override;
 
@@ -156,6 +157,11 @@ public:
     template <typename T>
     Errno SetSockOpt(SOCKET fd, int option, T value);
 
+    std::pair<Errno, Errno> GetPendingError() override;
+
+    template <typename T>
+    std::pair<T, Errno> GetSockOpt(SOCKET fd, int option);
+
     bool IsOpened() const override;
 
     void HandleProxyPacket(const ProxyPacket& packet) override;