Ryujinx/Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/IResolver.cs
gdkchan 4864648e72
Return error on DNS resolution when guest internet access is disabled (#2983)
* Return error on DNS resolution when guest internet access is disabled

* Log DNS lookup calls
2022-01-08 20:18:09 -03:00

648 lines
No EOL
26 KiB
C#

using Ryujinx.Common.Logging;
using Ryujinx.Cpu;
using Ryujinx.HLE.HOS.Services.Sockets.Nsd.Manager;
using Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Proxy;
using Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres.Types;
using Ryujinx.Memory;
using System;
using System.Buffers.Binary;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.CompilerServices;
using System.Text;
namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres
{
[Service("sfdnsres")]
class IResolver : IpcService
{
public IResolver(ServiceCtx context) { }
[CommandHipc(0)]
// SetDnsAddressesPrivateRequest(u32, buffer<unknown, 5, 0>)
public ResultCode SetDnsAddressesPrivateRequest(ServiceCtx context)
{
uint cancelHandleRequest = context.RequestData.ReadUInt32();
ulong bufferPosition = context.Request.SendBuff[0].Position;
ulong bufferSize = context.Request.SendBuff[0].Size;
// TODO: This is stubbed in 2.0.0+, reverse 1.0.0 version for the sake of completeness.
Logger.Stub?.PrintStub(LogClass.ServiceSfdnsres, new { cancelHandleRequest });
return ResultCode.NotAllocated;
}
[CommandHipc(1)]
// GetDnsAddressPrivateRequest(u32) -> buffer<unknown, 6, 0>
public ResultCode GetDnsAddressPrivateRequest(ServiceCtx context)
{
uint cancelHandleRequest = context.RequestData.ReadUInt32();
ulong bufferPosition = context.Request.ReceiveBuff[0].Position;
ulong bufferSize = context.Request.ReceiveBuff[0].Size;
// TODO: This is stubbed in 2.0.0+, reverse 1.0.0 version for the sake of completeness.
Logger.Stub?.PrintStub(LogClass.ServiceSfdnsres, new { cancelHandleRequest });
return ResultCode.NotAllocated;
}
[CommandHipc(2)]
// GetHostByNameRequest(u8, u32, u64, pid, buffer<unknown, 5, 0>) -> (u32, u32, u32, buffer<unknown, 6, 0>)
public ResultCode GetHostByNameRequest(ServiceCtx context)
{
ulong inputBufferPosition = context.Request.SendBuff[0].Position;
ulong inputBufferSize = context.Request.SendBuff[0].Size;
ulong outputBufferPosition = context.Request.ReceiveBuff[0].Position;
ulong outputBufferSize = context.Request.ReceiveBuff[0].Size;
return GetHostByNameRequestImpl(context, inputBufferPosition, inputBufferSize, outputBufferPosition, outputBufferSize, false, 0, 0);
}
[CommandHipc(3)]
// GetHostByAddrRequest(u32, u32, u32, u64, pid, buffer<unknown, 5, 0>) -> (u32, u32, u32, buffer<unknown, 6, 0>)
public ResultCode GetHostByAddrRequest(ServiceCtx context)
{
ulong inputBufferPosition = context.Request.SendBuff[0].Position;
ulong inputBufferSize = context.Request.SendBuff[0].Size;
ulong outputBufferPosition = context.Request.ReceiveBuff[0].Position;
ulong outputBufferSize = context.Request.ReceiveBuff[0].Size;
return GetHostByAddrRequestImpl(context, inputBufferPosition, inputBufferSize, outputBufferPosition, outputBufferSize, false, 0, 0);
}
[CommandHipc(4)]
// GetHostStringErrorRequest(u32) -> buffer<unknown, 6, 0>
public ResultCode GetHostStringErrorRequest(ServiceCtx context)
{
ResultCode resultCode = ResultCode.NotAllocated;
NetDbError errorCode = (NetDbError)context.RequestData.ReadInt32();
string errorString = errorCode switch
{
NetDbError.Success => "Resolver Error 0 (no error)",
NetDbError.HostNotFound => "Unknown host",
NetDbError.TryAgain => "Host name lookup failure",
NetDbError.NoRecovery => "Unknown server error",
NetDbError.NoData => "No address associated with name",
_ => (errorCode <= NetDbError.Internal) ? "Resolver internal error" : "Unknown resolver error"
};
ulong bufferPosition = context.Request.ReceiveBuff[0].Position;
ulong bufferSize = context.Request.ReceiveBuff[0].Size;
if ((ulong)(errorString.Length + 1) <= bufferSize)
{
context.Memory.Write(bufferPosition, Encoding.ASCII.GetBytes(errorString + '\0'));
resultCode = ResultCode.Success;
}
return resultCode;
}
[CommandHipc(5)]
// GetGaiStringErrorRequest(u32) -> buffer<byte, 6, 0>
public ResultCode GetGaiStringErrorRequest(ServiceCtx context)
{
ResultCode resultCode = ResultCode.NotAllocated;
GaiError errorCode = (GaiError)context.RequestData.ReadInt32();
if (errorCode > GaiError.Max)
{
errorCode = GaiError.Max;
}
string errorString = errorCode switch
{
GaiError.AddressFamily => "Address family for hostname not supported",
GaiError.Again => "Temporary failure in name resolution",
GaiError.BadFlags => "Invalid value for ai_flags",
GaiError.Fail => "Non-recoverable failure in name resolution",
GaiError.Family => "ai_family not supported",
GaiError.Memory => "Memory allocation failure",
GaiError.NoData => "No address associated with hostname",
GaiError.NoName => "hostname nor servname provided, or not known",
GaiError.Service => "servname not supported for ai_socktype",
GaiError.SocketType => "ai_socktype not supported",
GaiError.System => "System error returned in errno",
GaiError.BadHints => "Invalid value for hints",
GaiError.Protocol => "Resolved protocol is unknown",
GaiError.Overflow => "Argument buffer overflow",
GaiError.Max => "Unknown error",
_ => "Success"
};
ulong bufferPosition = context.Request.ReceiveBuff[0].Position;
ulong bufferSize = context.Request.ReceiveBuff[0].Size;
if ((ulong)(errorString.Length + 1) <= bufferSize)
{
context.Memory.Write(bufferPosition, Encoding.ASCII.GetBytes(errorString + '\0'));
resultCode = ResultCode.Success;
}
return resultCode;
}
[CommandHipc(6)]
// GetAddrInfoRequest(bool enable_nsd_resolve, u32, u64 pid_placeholder, pid, buffer<i8, 5, 0> host, buffer<i8, 5, 0> service, buffer<packed_addrinfo, 5, 0> hints) -> (i32 ret, u32 bsd_errno, u32 packed_addrinfo_size, buffer<packed_addrinfo, 6, 0> response)
public ResultCode GetAddrInfoRequest(ServiceCtx context)
{
ulong responseBufferPosition = context.Request.ReceiveBuff[0].Position;
ulong responseBufferSize = context.Request.ReceiveBuff[0].Size;
return GetAddrInfoRequestImpl(context, responseBufferPosition, responseBufferSize, false, 0, 0);
}
[CommandHipc(8)]
// GetCancelHandleRequest(u64, pid) -> u32
public ResultCode GetCancelHandleRequest(ServiceCtx context)
{
ulong pidPlaceHolder = context.RequestData.ReadUInt64();
uint cancelHandleRequest = 0;
context.ResponseData.Write(cancelHandleRequest);
Logger.Stub?.PrintStub(LogClass.ServiceSfdnsres, new { cancelHandleRequest });
return ResultCode.Success;
}
[CommandHipc(9)]
// CancelRequest(u32, u64, pid)
public ResultCode CancelRequest(ServiceCtx context)
{
uint cancelHandleRequest = context.RequestData.ReadUInt32();
ulong pidPlaceHolder = context.RequestData.ReadUInt64();
Logger.Stub?.PrintStub(LogClass.ServiceSfdnsres, new { cancelHandleRequest });
return ResultCode.Success;
}
[CommandHipc(10)] // 5.0.0+
// GetHostByNameRequestWithOptions(u8, u32, u64, pid, buffer<unknown, 21, 0>, buffer<unknown, 21, 0>) -> (u32, u32, u32, buffer<unknown, 22, 0>)
public ResultCode GetHostByNameRequestWithOptions(ServiceCtx context)
{
(ulong inputBufferPosition, ulong inputBufferSize) = context.Request.GetBufferType0x21();
(ulong outputBufferPosition, ulong outputBufferSize) = context.Request.GetBufferType0x22();
(ulong optionsBufferPosition, ulong optionsBufferSize) = context.Request.GetBufferType0x21();
return GetHostByNameRequestImpl(
context,
inputBufferPosition,
inputBufferSize,
outputBufferPosition,
outputBufferSize,
true,
optionsBufferPosition,
optionsBufferSize);
}
[CommandHipc(11)] // 5.0.0+
// GetHostByAddrRequestWithOptions(u32, u32, u32, u64, pid, buffer<unknown, 21, 0>, buffer<unknown, 21, 0>) -> (u32, u32, u32, buffer<unknown, 22, 0>)
public ResultCode GetHostByAddrRequestWithOptions(ServiceCtx context)
{
(ulong inputBufferPosition, ulong inputBufferSize) = context.Request.GetBufferType0x21();
(ulong outputBufferPosition, ulong outputBufferSize) = context.Request.GetBufferType0x22();
(ulong optionsBufferPosition, ulong optionsBufferSize) = context.Request.GetBufferType0x21();
return GetHostByAddrRequestImpl(
context,
inputBufferPosition,
inputBufferSize,
outputBufferPosition,
outputBufferSize,
true,
optionsBufferPosition,
optionsBufferSize);
}
[CommandHipc(12)] // 5.0.0+
// GetAddrInfoRequestWithOptions(bool enable_nsd_resolve, u32, u64 pid_placeholder, pid, buffer<i8, 5, 0> host, buffer<i8, 5, 0> service, buffer<packed_addrinfo, 5, 0> hints, buffer<unknown, 21, 0>) -> (i32 ret, u32 bsd_errno, u32 unknown, u32 packed_addrinfo_size, buffer<packed_addrinfo, 22, 0> response)
public ResultCode GetAddrInfoRequestWithOptions(ServiceCtx context)
{
(ulong outputBufferPosition, ulong outputBufferSize) = context.Request.GetBufferType0x22();
(ulong optionsBufferPosition, ulong optionsBufferSize) = context.Request.GetBufferType0x21();
return GetAddrInfoRequestImpl(context, outputBufferPosition, outputBufferSize, true, optionsBufferPosition, optionsBufferSize);
}
private static ResultCode GetHostByNameRequestImpl(
ServiceCtx context,
ulong inputBufferPosition,
ulong inputBufferSize,
ulong outputBufferPosition,
ulong outputBufferSize,
bool withOptions,
ulong optionsBufferPosition,
ulong optionsBufferSize)
{
string host = MemoryHelper.ReadAsciiString(context.Memory, inputBufferPosition, (int)inputBufferSize);
if (!context.Device.Configuration.EnableInternetAccess)
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked: {host}");
WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
return ResultCode.Success;
}
// TODO: Use params.
bool enableNsdResolve = (context.RequestData.ReadInt32() & 1) != 0;
int timeOut = context.RequestData.ReadInt32();
ulong pidPlaceholder = context.RequestData.ReadUInt64();
if (withOptions)
{
// TODO: Parse and use options.
}
IPHostEntry hostEntry = null;
NetDbError netDbErrorCode = NetDbError.Success;
GaiError errno = GaiError.Overflow;
ulong serializedSize = 0;
if (host.Length <= byte.MaxValue)
{
if (enableNsdResolve)
{
if (FqdnResolver.Resolve(host, out string newAddress) == Nsd.ResultCode.Success)
{
host = newAddress;
}
}
string targetHost = host;
if (DnsBlacklist.IsHostBlocked(host))
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"DNS Blocked: {host}");
netDbErrorCode = NetDbError.HostNotFound;
errno = GaiError.NoData;
}
else
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Trying to resolve: {host}");
try
{
hostEntry = Dns.GetHostEntry(targetHost);
}
catch (SocketException exception)
{
netDbErrorCode = ConvertSocketErrorCodeToNetDbError(exception.ErrorCode);
errno = ConvertSocketErrorCodeToGaiError(exception.ErrorCode, errno);
}
}
}
else
{
netDbErrorCode = NetDbError.HostNotFound;
}
if (hostEntry != null)
{
IEnumerable<IPAddress> addresses = GetIpv4Addresses(hostEntry);
if (!addresses.Any())
{
errno = GaiError.NoData;
netDbErrorCode = NetDbError.NoAddress;
}
else
{
errno = GaiError.Success;
serializedSize = SerializeHostEntries(context, outputBufferPosition, outputBufferSize, hostEntry, addresses);
}
}
WriteResponse(context, withOptions, serializedSize, errno, netDbErrorCode);
return ResultCode.Success;
}
private static ResultCode GetHostByAddrRequestImpl(
ServiceCtx context,
ulong inputBufferPosition,
ulong inputBufferSize,
ulong outputBufferPosition,
ulong outputBufferSize,
bool withOptions,
ulong optionsBufferPosition,
ulong optionsBufferSize)
{
if (!context.Device.Configuration.EnableInternetAccess)
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked.");
WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
return ResultCode.Success;
}
byte[] rawIp = new byte[inputBufferSize];
context.Memory.Read(inputBufferPosition, rawIp);
// TODO: Use params.
uint socketLength = context.RequestData.ReadUInt32();
uint type = context.RequestData.ReadUInt32();
int timeOut = context.RequestData.ReadInt32();
ulong pidPlaceholder = context.RequestData.ReadUInt64();
if (withOptions)
{
// TODO: Parse and use options.
}
IPHostEntry hostEntry = null;
NetDbError netDbErrorCode = NetDbError.Success;
GaiError errno = GaiError.AddressFamily;
ulong serializedSize = 0;
if (rawIp.Length == 4)
{
try
{
IPAddress address = new IPAddress(rawIp);
hostEntry = Dns.GetHostEntry(address);
}
catch (SocketException exception)
{
netDbErrorCode = ConvertSocketErrorCodeToNetDbError(exception.ErrorCode);
errno = ConvertSocketErrorCodeToGaiError(exception.ErrorCode, errno);
}
}
else
{
netDbErrorCode = NetDbError.NoAddress;
}
if (hostEntry != null)
{
errno = GaiError.Success;
serializedSize = SerializeHostEntries(context, outputBufferPosition, outputBufferSize, hostEntry, GetIpv4Addresses(hostEntry));
}
WriteResponse(context, withOptions, serializedSize, errno, netDbErrorCode);
return ResultCode.Success;
}
private static ulong SerializeHostEntries(ServiceCtx context, ulong outputBufferPosition, ulong outputBufferSize, IPHostEntry hostEntry, IEnumerable<IPAddress> addresses = null)
{
ulong originalBufferPosition = outputBufferPosition;
ulong bufferPosition = originalBufferPosition;
string hostName = hostEntry.HostName + '\0';
// h_name
context.Memory.Write(bufferPosition, Encoding.ASCII.GetBytes(hostName));
bufferPosition += (ulong)hostName.Length;
// h_aliases list size
context.Memory.Write(bufferPosition, BinaryPrimitives.ReverseEndianness(hostEntry.Aliases.Length));
bufferPosition += sizeof(int);
// Actual aliases
foreach (string alias in hostEntry.Aliases)
{
context.Memory.Write(bufferPosition, Encoding.ASCII.GetBytes(alias + '\0'));
bufferPosition += (ulong)(alias.Length + 1);
}
// h_addrtype but it's a short (also only support IPv4)
context.Memory.Write(bufferPosition, BinaryPrimitives.ReverseEndianness((short)AddressFamily.InterNetwork));
bufferPosition += sizeof(short);
// h_length but it's a short
context.Memory.Write(bufferPosition, BinaryPrimitives.ReverseEndianness((short)4));
bufferPosition += sizeof(short);
// Ip address count, we can only support ipv4 (blame Nintendo)
context.Memory.Write(bufferPosition, addresses != null ? BinaryPrimitives.ReverseEndianness(addresses.Count()) : 0);
bufferPosition += sizeof(int);
if (addresses != null)
{
foreach (IPAddress ip in addresses)
{
context.Memory.Write(bufferPosition, BinaryPrimitives.ReverseEndianness(BitConverter.ToInt32(ip.GetAddressBytes(), 0)));
bufferPosition += sizeof(int);
}
}
return bufferPosition - originalBufferPosition;
}
private static ResultCode GetAddrInfoRequestImpl(
ServiceCtx context,
ulong responseBufferPosition,
ulong responseBufferSize,
bool withOptions,
ulong optionsBufferPosition,
ulong optionsBufferSize)
{
bool enableNsdResolve = (context.RequestData.ReadInt32() & 1) != 0;
uint cancelHandle = context.RequestData.ReadUInt32();
string host = MemoryHelper.ReadAsciiString(context.Memory, context.Request.SendBuff[0].Position, (long)context.Request.SendBuff[0].Size);
string service = MemoryHelper.ReadAsciiString(context.Memory, context.Request.SendBuff[1].Position, (long)context.Request.SendBuff[1].Size);
if (!context.Device.Configuration.EnableInternetAccess)
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked: {host}");
WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
return ResultCode.Success;
}
// NOTE: We ignore hints for now.
DeserializeAddrInfos(context.Memory, (ulong)context.Request.SendBuff[2].Position, (ulong)context.Request.SendBuff[2].Size);
if (withOptions)
{
// TODO: Find unknown, Parse and use options.
uint unknown = context.RequestData.ReadUInt32();
}
ulong pidPlaceHolder = context.RequestData.ReadUInt64();
IPHostEntry hostEntry = null;
NetDbError netDbErrorCode = NetDbError.Success;
GaiError errno = GaiError.AddressFamily;
ulong serializedSize = 0;
if (host.Length <= byte.MaxValue)
{
if (enableNsdResolve)
{
if (FqdnResolver.Resolve(host, out string newAddress) == Nsd.ResultCode.Success)
{
host = newAddress;
}
}
string targetHost = host;
if (DnsBlacklist.IsHostBlocked(host))
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"DNS Blocked: {host}");
netDbErrorCode = NetDbError.HostNotFound;
errno = GaiError.NoData;
}
else
{
Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Trying to resolve: {host}");
try
{
hostEntry = Dns.GetHostEntry(targetHost);
}
catch (SocketException exception)
{
netDbErrorCode = ConvertSocketErrorCodeToNetDbError(exception.ErrorCode);
errno = ConvertSocketErrorCodeToGaiError(exception.ErrorCode, errno);
}
}
}
else
{
netDbErrorCode = NetDbError.NoAddress;
}
if (hostEntry != null)
{
int.TryParse(service, out int port);
errno = GaiError.Success;
serializedSize = SerializeAddrInfos(context, responseBufferPosition, responseBufferSize, hostEntry, port);
}
WriteResponse(context, withOptions, serializedSize, errno, netDbErrorCode);
return ResultCode.Success;
}
private static void DeserializeAddrInfos(IVirtualMemoryManager memory, ulong address, ulong size)
{
ulong endAddress = address + size;
while (address < endAddress)
{
AddrInfoSerializedHeader header = memory.Read<AddrInfoSerializedHeader>(address);
if (header.Magic != SfdnsresContants.AddrInfoMagic)
{
break;
}
address += (ulong)Unsafe.SizeOf<AddrInfoSerializedHeader>() + header.AddressLength;
// ai_canonname
string canonname = MemoryHelper.ReadAsciiString(memory, address);
}
}
private static ulong SerializeAddrInfos(ServiceCtx context, ulong responseBufferPosition, ulong responseBufferSize, IPHostEntry hostEntry, int port)
{
ulong originalBufferPosition = (ulong)responseBufferPosition;
ulong bufferPosition = originalBufferPosition;
string hostName = hostEntry.HostName + '\0';
for (int i = 0; i < hostEntry.AddressList.Length; i++)
{
IPAddress ip = hostEntry.AddressList[i];
if (ip.AddressFamily != AddressFamily.InterNetwork)
{
continue;
}
AddrInfoSerializedHeader header = new AddrInfoSerializedHeader(ip, 0);
// NOTE: 0 = Any
context.Memory.Write(bufferPosition, header);
bufferPosition += (ulong)Unsafe.SizeOf<AddrInfoSerializedHeader>();
// addrinfo_in
context.Memory.Write(bufferPosition, new AddrInfo4(ip, (short)port));
bufferPosition += header.AddressLength;
// ai_canonname
context.Memory.Write(bufferPosition, Encoding.ASCII.GetBytes(hostName));
bufferPosition += (ulong)hostName.Length;
}
// Termination zero value.
context.Memory.Write(bufferPosition, 0);
bufferPosition += sizeof(int);
return bufferPosition - originalBufferPosition;
}
private static void WriteResponse(
ServiceCtx context,
bool withOptions,
ulong serializedSize,
GaiError errno,
NetDbError netDbErrorCode)
{
if (withOptions)
{
context.ResponseData.Write((int)serializedSize);
context.ResponseData.Write((int)errno);
context.ResponseData.Write((int)netDbErrorCode);
context.ResponseData.Write(0);
}
else
{
context.ResponseData.Write((int)netDbErrorCode);
context.ResponseData.Write((int)errno);
context.ResponseData.Write((int)serializedSize);
}
}
private static IEnumerable<IPAddress> GetIpv4Addresses(IPHostEntry hostEntry)
{
return hostEntry.AddressList.Where(x => x.AddressFamily == AddressFamily.InterNetwork);
}
private static NetDbError ConvertSocketErrorCodeToNetDbError(int errorCode)
{
return errorCode switch
{
11001 => NetDbError.HostNotFound,
11002 => NetDbError.TryAgain,
11003 => NetDbError.NoRecovery,
11004 => NetDbError.NoData,
_ => NetDbError.Internal
};
}
private static GaiError ConvertSocketErrorCodeToGaiError(int errorCode, GaiError errno)
{
return errorCode switch
{
11001 => GaiError.NoData,
10060 => GaiError.Again,
_ => errno
};
}
}
}