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service: sfdnsres: Implement DNS address resolution

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This commit is contained in:
tech-ticks
2022-04-07 23:07:12 +02:00
parent 1c3983c12e
commit 82d46a974a
2 changed files with 198 additions and 6 deletions
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203
src/core/hle/service/sockets/sfdnsres.cpp
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@@ -2,8 +2,24 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <string_view>
#include <utility>
#include <vector>
#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 <ws2tcpip.h>
#elif YUZU_UNIX
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#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<u8> 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<u8> 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<sockaddr_in*>(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<sockaddr_in6*>(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<u32, s32> 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<Parameters>();
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<u8>& data = SerializeAddrInfo(addrinfo, result_code, host);
data_size = static_cast<u32>(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<s32>(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<s32>(AddrInfoErrorToNetDbError(result_code))); // NetDBErrorCode
rb.Push(0);
}
} // namespace Service::Sockets

1
src/core/hle/service/sockets/sfdnsres.h
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@@ -19,6 +19,7 @@ public:
private:
void GetAddrInfoRequest(Kernel::HLERequestContext& ctx);
void GetAddrInfoRequestWithOptions(Kernel::HLERequestContext& ctx);
};
} // namespace Service::Sockets