From 82d46a974ad46956169f161257ebc8f67dc80f26 Mon Sep 17 00:00:00 2001 From: tech-ticks Date: Thu, 7 Apr 2022 23:07:12 +0200 Subject: [PATCH] service: sfdnsres: Implement DNS address resolution --- src/core/hle/service/sockets/sfdnsres.cpp | 203 +++++++++++++++++++++- src/core/hle/service/sockets/sfdnsres.h | 1 + 2 files changed, 198 insertions(+), 6 deletions(-) diff --git a/src/core/hle/service/sockets/sfdnsres.cpp b/src/core/hle/service/sockets/sfdnsres.cpp index fb6142c49..2e5666ca8 100644 --- a/src/core/hle/service/sockets/sfdnsres.cpp +++ b/src/core/hle/service/sockets/sfdnsres.cpp @@ -2,8 +2,24 @@ // Licensed under GPLv2 or any later version // Refer to the license.txt file included. +#include +#include +#include + +#include "common/string_util.h" +#include "common/swap.h" +#include "core/core.h" #include "core/hle/ipc_helpers.h" #include "core/hle/service/sockets/sfdnsres.h" +#include "core/memory.h" + +#ifdef _WIN32 +#include +#elif YUZU_UNIX +#include +#include +#include +#endif namespace Service::Sockets { @@ -21,7 +37,7 @@ SFDNSRES::SFDNSRES(Core::System& system_) : ServiceFramework{system_, "sfdnsres" {9, nullptr, "CancelRequest"}, {10, nullptr, "GetHostByNameRequestWithOptions"}, {11, nullptr, "GetHostByAddrRequestWithOptions"}, - {12, nullptr, "GetAddrInfoRequestWithOptions"}, + {12, &SFDNSRES::GetAddrInfoRequestWithOptions, "GetAddrInfoRequestWithOptions"}, {13, nullptr, "GetNameInfoRequestWithOptions"}, {14, nullptr, "ResolverSetOptionRequest"}, {15, nullptr, "ResolverGetOptionRequest"}, @@ -31,7 +47,142 @@ SFDNSRES::SFDNSRES(Core::System& system_) : ServiceFramework{system_, "sfdnsres" SFDNSRES::~SFDNSRES() = default; -void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) { +enum class NetDbError : s32 { + Internal = -1, + Success = 0, + HostNotFound = 1, + TryAgain = 2, + NoRecovery = 3, + NoData = 4, +}; + +static NetDbError AddrInfoErrorToNetDbError(s32 result) { + // Best effort guess to map errors + switch (result) { + case 0: + return NetDbError::Success; + case EAI_AGAIN: + return NetDbError::TryAgain; + case EAI_NODATA: + return NetDbError::NoData; + default: + return NetDbError::HostNotFound; + } +} + +static std::vector SerializeAddrInfo(const addrinfo* addrinfo, s32 result_code, + std::string_view host) { + // Adapted from + // https://github.com/switchbrew/libnx/blob/c5a9a909a91657a9818a3b7e18c9b91ff0cbb6e3/nx/source/runtime/resolver.c#L190 + std::vector data; + + auto* current = addrinfo; + while (current != nullptr) { + struct SerializedResponseHeader { + u32 magic; + s32 flags; + s32 family; + s32 socket_type; + s32 protocol; + u32 address_length; + }; + static_assert(sizeof(SerializedResponseHeader) == 0x18, + "Response header size must be 0x18 bytes"); + + constexpr auto header_size = sizeof(SerializedResponseHeader); + const auto addr_size = + current->ai_addr && current->ai_addrlen > 0 ? current->ai_addrlen : 4; + const auto canonname_size = current->ai_canonname ? strlen(current->ai_canonname) + 1 : 1; + + const auto last_size = data.size(); + data.resize(last_size + header_size + addr_size + canonname_size); + + // Header in network byte order + SerializedResponseHeader header{}; + + constexpr auto HEADER_MAGIC = 0xBEEFCAFE; + header.magic = htonl(HEADER_MAGIC); + header.family = htonl(current->ai_family); + header.flags = htonl(current->ai_flags); + header.socket_type = htonl(current->ai_socktype); + header.protocol = htonl(current->ai_protocol); + header.address_length = current->ai_addr ? htonl((u32)current->ai_addrlen) : 0; + + auto* header_ptr = data.data() + last_size; + std::memcpy(header_ptr, &header, header_size); + + if (header.address_length == 0) { + std::memset(header_ptr + header_size, 0, 4); + } else { + switch (current->ai_family) { + case AF_INET: { + struct SockAddrIn { + s16 sin_family; + u16 sin_port; + u32 sin_addr; + u8 sin_zero[8]; + }; + + SockAddrIn serialized_addr{}; + const auto addr = *reinterpret_cast(current->ai_addr); + serialized_addr.sin_port = htons(addr.sin_port); + serialized_addr.sin_family = htons(addr.sin_family); + serialized_addr.sin_addr = htonl(addr.sin_addr.s_addr); + std::memcpy(header_ptr + header_size, &serialized_addr, sizeof(SockAddrIn)); + + char addr_string_buf[64]{}; + inet_ntop(AF_INET, &addr.sin_addr, addr_string_buf, std::size(addr_string_buf)); + LOG_INFO(Service, "Resolved host '{}' to IPv4 address {}", host, addr_string_buf); + break; + } + case AF_INET6: { + struct SockAddrIn6 { + s16 sin6_family; + u16 sin6_port; + u32 sin6_flowinfo; + u8 sin6_addr[16]; + u32 sin6_scope_id; + }; + + SockAddrIn6 serialized_addr{}; + const auto addr = *reinterpret_cast(current->ai_addr); + serialized_addr.sin6_family = htons(addr.sin6_family); + serialized_addr.sin6_port = htons(addr.sin6_port); + serialized_addr.sin6_flowinfo = htonl(addr.sin6_flowinfo); + serialized_addr.sin6_scope_id = htonl(addr.sin6_scope_id); + std::memcpy(serialized_addr.sin6_addr, &addr.sin6_addr, + sizeof(SockAddrIn6::sin6_addr)); + std::memcpy(header_ptr + header_size, &serialized_addr, sizeof(SockAddrIn6)); + + char addr_string_buf[64]{}; + inet_ntop(AF_INET6, &addr.sin6_addr, addr_string_buf, std::size(addr_string_buf)); + LOG_INFO(Service, "Resolved host '{}' to IPv6 address {}", host, addr_string_buf); + break; + } + default: + std::memcpy(header_ptr + header_size, current->ai_addr, addr_size); + break; + } + } + if (current->ai_canonname) { + std::memcpy(header_ptr + addr_size, current->ai_canonname, canonname_size); + } else { + *(header_ptr + header_size + addr_size) = 0; + } + + current = current->ai_next; + } + + // 4-byte sentinel value + data.push_back(0); + data.push_back(0); + data.push_back(0); + data.push_back(0); + + return data; +} + +static std::pair GetAddrInfoRequestImpl(Kernel::HLERequestContext& ctx) { struct Parameters { u8 use_nsd_resolve; u32 unknown; @@ -42,11 +193,51 @@ void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) { const auto parameters = rp.PopRaw(); LOG_WARNING(Service, - "(STUBBED) called. use_nsd_resolve={}, unknown=0x{:08X}, process_id=0x{:016X}", + "called with ignored parameters: use_nsd_resolve={}, unknown={}, process_id={}", parameters.use_nsd_resolve, parameters.unknown, parameters.process_id); - IPC::ResponseBuilder rb{ctx, 2}; - rb.Push(ResultSuccess); + const auto host_buffer = ctx.ReadBuffer(0); + const std::string host = Common::StringFromBuffer(host_buffer); + + const auto service_buffer = ctx.ReadBuffer(1); + const std::string service = Common::StringFromBuffer(service_buffer); + + addrinfo* addrinfo; + // Pass null for hints. Serialized hints are also passed in a buffer, but are ignored for now + s32 result_code = getaddrinfo(host.c_str(), service.c_str(), nullptr, &addrinfo); + + u32 data_size = 0; + if (result_code == 0 && addrinfo != nullptr) { + const std::vector& data = SerializeAddrInfo(addrinfo, result_code, host); + data_size = static_cast(data.size()); + freeaddrinfo(addrinfo); + + ctx.WriteBuffer(data, 0); + } + + return std::make_pair(data_size, result_code); } -} // namespace Service::Sockets +void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) { + auto [data_size, result_code] = GetAddrInfoRequestImpl(ctx); + + IPC::ResponseBuilder rb{ctx, 4}; + rb.Push(ResultSuccess); + rb.Push(static_cast(AddrInfoErrorToNetDbError(result_code))); // NetDBErrorCode + rb.Push(result_code); // errno + rb.Push(data_size); // serialized size +} + +void SFDNSRES::GetAddrInfoRequestWithOptions(Kernel::HLERequestContext& ctx) { + // Additional options are ignored + auto [data_size, result_code] = GetAddrInfoRequestImpl(ctx); + + IPC::ResponseBuilder rb{ctx, 5}; + rb.Push(ResultSuccess); + rb.Push(data_size); // serialized size + rb.Push(result_code); // errno + rb.Push(static_cast(AddrInfoErrorToNetDbError(result_code))); // NetDBErrorCode + rb.Push(0); +} + +} // namespace Service::Sockets \ No newline at end of file diff --git a/src/core/hle/service/sockets/sfdnsres.h b/src/core/hle/service/sockets/sfdnsres.h index 5d3b4dc2d..f0c57377d 100644 --- a/src/core/hle/service/sockets/sfdnsres.h +++ b/src/core/hle/service/sockets/sfdnsres.h @@ -19,6 +19,7 @@ public: private: void GetAddrInfoRequest(Kernel::HLERequestContext& ctx); + void GetAddrInfoRequestWithOptions(Kernel::HLERequestContext& ctx); }; } // namespace Service::Sockets