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service: sfdnsres: Implement DNS address resolution
This commit is contained in:
tech-ticks
parent
1c3983c12e
commit
82d46a974a
@ -2,8 +2,24 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <string_view>
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#include <utility>
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#include <vector>
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#include "common/string_util.h"
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#include "common/swap.h"
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#include "core/core.h"
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#include "core/hle/ipc_helpers.h"
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#include "core/hle/service/sockets/sfdnsres.h"
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#include "core/memory.h"
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#ifdef _WIN32
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#include <ws2tcpip.h>
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#elif YUZU_UNIX
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#endif
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namespace Service::Sockets {
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@ -21,7 +37,7 @@ SFDNSRES::SFDNSRES(Core::System& system_) : ServiceFramework{system_, "sfdnsres"
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{9, nullptr, "CancelRequest"},
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{10, nullptr, "GetHostByNameRequestWithOptions"},
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{11, nullptr, "GetHostByAddrRequestWithOptions"},
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{12, nullptr, "GetAddrInfoRequestWithOptions"},
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{12, &SFDNSRES::GetAddrInfoRequestWithOptions, "GetAddrInfoRequestWithOptions"},
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{13, nullptr, "GetNameInfoRequestWithOptions"},
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{14, nullptr, "ResolverSetOptionRequest"},
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{15, nullptr, "ResolverGetOptionRequest"},
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@ -31,7 +47,142 @@ SFDNSRES::SFDNSRES(Core::System& system_) : ServiceFramework{system_, "sfdnsres"
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SFDNSRES::~SFDNSRES() = default;
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void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) {
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enum class NetDbError : s32 {
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Internal = -1,
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Success = 0,
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HostNotFound = 1,
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TryAgain = 2,
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NoRecovery = 3,
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NoData = 4,
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};
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static NetDbError AddrInfoErrorToNetDbError(s32 result) {
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// Best effort guess to map errors
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switch (result) {
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case 0:
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return NetDbError::Success;
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case EAI_AGAIN:
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return NetDbError::TryAgain;
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case EAI_NODATA:
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return NetDbError::NoData;
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default:
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return NetDbError::HostNotFound;
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}
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}
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static std::vector<u8> SerializeAddrInfo(const addrinfo* addrinfo, s32 result_code,
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std::string_view host) {
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// Adapted from
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// https://github.com/switchbrew/libnx/blob/c5a9a909a91657a9818a3b7e18c9b91ff0cbb6e3/nx/source/runtime/resolver.c#L190
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std::vector<u8> data;
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auto* current = addrinfo;
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while (current != nullptr) {
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struct SerializedResponseHeader {
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u32 magic;
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s32 flags;
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s32 family;
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s32 socket_type;
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s32 protocol;
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u32 address_length;
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};
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static_assert(sizeof(SerializedResponseHeader) == 0x18,
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"Response header size must be 0x18 bytes");
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constexpr auto header_size = sizeof(SerializedResponseHeader);
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const auto addr_size =
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current->ai_addr && current->ai_addrlen > 0 ? current->ai_addrlen : 4;
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const auto canonname_size = current->ai_canonname ? strlen(current->ai_canonname) + 1 : 1;
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const auto last_size = data.size();
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data.resize(last_size + header_size + addr_size + canonname_size);
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// Header in network byte order
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SerializedResponseHeader header{};
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constexpr auto HEADER_MAGIC = 0xBEEFCAFE;
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header.magic = htonl(HEADER_MAGIC);
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header.family = htonl(current->ai_family);
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header.flags = htonl(current->ai_flags);
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header.socket_type = htonl(current->ai_socktype);
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header.protocol = htonl(current->ai_protocol);
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header.address_length = current->ai_addr ? htonl((u32)current->ai_addrlen) : 0;
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auto* header_ptr = data.data() + last_size;
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std::memcpy(header_ptr, &header, header_size);
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if (header.address_length == 0) {
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std::memset(header_ptr + header_size, 0, 4);
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} else {
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switch (current->ai_family) {
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case AF_INET: {
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struct SockAddrIn {
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s16 sin_family;
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u16 sin_port;
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u32 sin_addr;
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u8 sin_zero[8];
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};
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SockAddrIn serialized_addr{};
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const auto addr = *reinterpret_cast<sockaddr_in*>(current->ai_addr);
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serialized_addr.sin_port = htons(addr.sin_port);
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serialized_addr.sin_family = htons(addr.sin_family);
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serialized_addr.sin_addr = htonl(addr.sin_addr.s_addr);
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std::memcpy(header_ptr + header_size, &serialized_addr, sizeof(SockAddrIn));
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char addr_string_buf[64]{};
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inet_ntop(AF_INET, &addr.sin_addr, addr_string_buf, std::size(addr_string_buf));
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LOG_INFO(Service, "Resolved host '{}' to IPv4 address {}", host, addr_string_buf);
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break;
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}
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case AF_INET6: {
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struct SockAddrIn6 {
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s16 sin6_family;
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u16 sin6_port;
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u32 sin6_flowinfo;
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u8 sin6_addr[16];
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u32 sin6_scope_id;
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};
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SockAddrIn6 serialized_addr{};
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const auto addr = *reinterpret_cast<sockaddr_in6*>(current->ai_addr);
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serialized_addr.sin6_family = htons(addr.sin6_family);
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serialized_addr.sin6_port = htons(addr.sin6_port);
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serialized_addr.sin6_flowinfo = htonl(addr.sin6_flowinfo);
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serialized_addr.sin6_scope_id = htonl(addr.sin6_scope_id);
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std::memcpy(serialized_addr.sin6_addr, &addr.sin6_addr,
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sizeof(SockAddrIn6::sin6_addr));
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std::memcpy(header_ptr + header_size, &serialized_addr, sizeof(SockAddrIn6));
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char addr_string_buf[64]{};
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inet_ntop(AF_INET6, &addr.sin6_addr, addr_string_buf, std::size(addr_string_buf));
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LOG_INFO(Service, "Resolved host '{}' to IPv6 address {}", host, addr_string_buf);
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break;
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}
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default:
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std::memcpy(header_ptr + header_size, current->ai_addr, addr_size);
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break;
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}
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}
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if (current->ai_canonname) {
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std::memcpy(header_ptr + addr_size, current->ai_canonname, canonname_size);
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} else {
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*(header_ptr + header_size + addr_size) = 0;
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}
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current = current->ai_next;
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}
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// 4-byte sentinel value
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data.push_back(0);
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data.push_back(0);
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data.push_back(0);
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data.push_back(0);
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return data;
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}
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static std::pair<u32, s32> GetAddrInfoRequestImpl(Kernel::HLERequestContext& ctx) {
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struct Parameters {
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u8 use_nsd_resolve;
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u32 unknown;
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@ -42,11 +193,51 @@ void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) {
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const auto parameters = rp.PopRaw<Parameters>();
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LOG_WARNING(Service,
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"(STUBBED) called. use_nsd_resolve={}, unknown=0x{:08X}, process_id=0x{:016X}",
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"called with ignored parameters: use_nsd_resolve={}, unknown={}, process_id={}",
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parameters.use_nsd_resolve, parameters.unknown, parameters.process_id);
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IPC::ResponseBuilder rb{ctx, 2};
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rb.Push(ResultSuccess);
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const auto host_buffer = ctx.ReadBuffer(0);
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const std::string host = Common::StringFromBuffer(host_buffer);
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const auto service_buffer = ctx.ReadBuffer(1);
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const std::string service = Common::StringFromBuffer(service_buffer);
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addrinfo* addrinfo;
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// Pass null for hints. Serialized hints are also passed in a buffer, but are ignored for now
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s32 result_code = getaddrinfo(host.c_str(), service.c_str(), nullptr, &addrinfo);
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u32 data_size = 0;
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if (result_code == 0 && addrinfo != nullptr) {
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const std::vector<u8>& data = SerializeAddrInfo(addrinfo, result_code, host);
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data_size = static_cast<u32>(data.size());
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freeaddrinfo(addrinfo);
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ctx.WriteBuffer(data, 0);
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}
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return std::make_pair(data_size, result_code);
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}
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} // namespace Service::Sockets
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void SFDNSRES::GetAddrInfoRequest(Kernel::HLERequestContext& ctx) {
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auto [data_size, result_code] = GetAddrInfoRequestImpl(ctx);
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IPC::ResponseBuilder rb{ctx, 4};
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rb.Push(ResultSuccess);
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rb.Push(static_cast<s32>(AddrInfoErrorToNetDbError(result_code))); // NetDBErrorCode
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rb.Push(result_code); // errno
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rb.Push(data_size); // serialized size
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}
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void SFDNSRES::GetAddrInfoRequestWithOptions(Kernel::HLERequestContext& ctx) {
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// Additional options are ignored
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auto [data_size, result_code] = GetAddrInfoRequestImpl(ctx);
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IPC::ResponseBuilder rb{ctx, 5};
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rb.Push(ResultSuccess);
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rb.Push(data_size); // serialized size
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rb.Push(result_code); // errno
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rb.Push(static_cast<s32>(AddrInfoErrorToNetDbError(result_code))); // NetDBErrorCode
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rb.Push(0);
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}
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} // namespace Service::Sockets
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@ -19,6 +19,7 @@ public:
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private:
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void GetAddrInfoRequest(Kernel::HLERequestContext& ctx);
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void GetAddrInfoRequestWithOptions(Kernel::HLERequestContext& ctx);
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};
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} // namespace Service::Sockets
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