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 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);
}