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...ft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SslOverTdsStream.NetCoreApp.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,305 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
|
|
||
| using System; | ||
| using System.Buffers; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| internal sealed partial class SslOverTdsStream | ||
| { | ||
| public override int Read(byte[] buffer, int offset, int count) | ||
| { | ||
| return Read(buffer.AsSpan(offset, count)); | ||
| } | ||
|
|
||
| public override void Write(byte[] buffer, int offset, int count) | ||
| { | ||
| Write(buffer.AsSpan(offset, count)); | ||
| } | ||
|
|
||
| public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return ReadAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
||
| public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return WriteAsync(new ReadOnlyMemory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
||
| public override int Read(Span<byte> buffer) | ||
| { | ||
| if (!_encapsulate) | ||
| { | ||
| return _stream.Read(buffer); | ||
| } | ||
|
|
||
| using (SNIEventScope.Create("<sc.SNI.SslOverTdsStream.Read |SNI|INFO|SCOPE> reading encapsulated bytes")) | ||
| { | ||
| if (_packetBytes > 0) | ||
| { | ||
| // there are queued bytes from a previous packet available | ||
| // work out how many of the remaining bytes we can consume | ||
| int wantedCount = Math.Min(buffer.Length, _packetBytes); | ||
| int readCount = _stream.Read(buffer.Slice(0, wantedCount)); | ||
| if (readCount == 0) | ||
| { | ||
| // 0 means the connection was closed, tell the caller | ||
| return 0; | ||
| } | ||
| _packetBytes -= readCount; | ||
| return readCount; | ||
| } | ||
| else | ||
| { | ||
| Span<byte> headerBytes = stackalloc byte[TdsEnums.HEADER_LEN]; | ||
|
|
||
| // fetch the packet header to determine how long the packet is | ||
| int headerBytesRead = 0; | ||
| do | ||
| { | ||
| int headerBytesReadIteration = _stream.Read(headerBytes.Slice(headerBytesRead, TdsEnums.HEADER_LEN - headerBytesRead)); | ||
| if (headerBytesReadIteration == 0) | ||
| { | ||
| // 0 means the connection was closed, tell the caller | ||
| return 0; | ||
| } | ||
| headerBytesRead += headerBytesReadIteration; | ||
| } while (headerBytesRead < TdsEnums.HEADER_LEN); | ||
|
|
||
| // read the packet data size from the header and store it in case it is needed for a subsequent call | ||
| _packetBytes = ((headerBytes[TdsEnums.HEADER_LEN_FIELD_OFFSET] << 8) | headerBytes[TdsEnums.HEADER_LEN_FIELD_OFFSET + 1]) - TdsEnums.HEADER_LEN; | ||
|
|
||
| // read as much from the packet as the caller can accept | ||
| int packetBytesRead = _stream.Read(buffer.Slice(0, Math.Min(buffer.Length, _packetBytes))); | ||
| _packetBytes -= packetBytesRead; | ||
| return packetBytesRead; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| if (!_encapsulate) | ||
| { | ||
| int read; | ||
| { | ||
| ValueTask<int> readValueTask = _stream.ReadAsync(buffer, cancellationToken); | ||
| if (readValueTask.IsCompletedSuccessfully) | ||
| { | ||
| read = readValueTask.Result; | ||
| } | ||
| else | ||
| { | ||
| read = await readValueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
| return read; | ||
| } | ||
| using (SNIEventScope.Create("<sc.SNI.SslOverTdsStream.ReadAsync |SNI|INFO|SCOPE> reading encapsulated bytes")) | ||
| { | ||
| if (_packetBytes > 0) | ||
| { | ||
| // there are queued bytes from a previous packet available | ||
| // work out how many of the remaining bytes we can consume | ||
| int wantedCount = Math.Min(buffer.Length, _packetBytes); | ||
|
|
||
| int readCount; | ||
| { | ||
| ValueTask<int> remainderReadValueTask = _stream.ReadAsync(buffer.Slice(0, wantedCount), cancellationToken); | ||
| if (remainderReadValueTask.IsCompletedSuccessfully) | ||
| { | ||
| readCount = remainderReadValueTask.Result; | ||
| } | ||
| else | ||
| { | ||
| readCount = await remainderReadValueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
| if (readCount == 0) | ||
| { | ||
| // 0 means the connection was closed, tell the caller | ||
| return 0; | ||
| } | ||
| _packetBytes -= readCount; | ||
| return readCount; | ||
| } | ||
| else | ||
| { | ||
| byte[] headerBytes = ArrayPool<byte>.Shared.Rent(TdsEnums.HEADER_LEN); | ||
|
|
||
| // fetch the packet header to determine how long the packet is | ||
| int headerBytesRead = 0; | ||
| do | ||
| { | ||
| int headerBytesReadIteration; | ||
| { | ||
| ValueTask<int> headerReadValueTask = _stream.ReadAsync(headerBytes.AsMemory(headerBytesRead, (TdsEnums.HEADER_LEN - headerBytesRead)), cancellationToken); | ||
| if (headerReadValueTask.IsCompletedSuccessfully) | ||
| { | ||
| headerBytesReadIteration = headerReadValueTask.Result; | ||
| } | ||
| else | ||
| { | ||
| headerBytesReadIteration = await headerReadValueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
| if (headerBytesReadIteration == 0) | ||
| { | ||
| // 0 means the connection was closed, cleanup the rented array and then tell the caller | ||
| ArrayPool<byte>.Shared.Return(headerBytes, clearArray: true); | ||
| return 0; | ||
| } | ||
| headerBytesRead += headerBytesReadIteration; | ||
| } while (headerBytesRead < TdsEnums.HEADER_LEN); | ||
|
|
||
| // read the packet data size from the header and store it in case it is needed for a subsequent call | ||
| _packetBytes = ((headerBytes[TdsEnums.HEADER_LEN_FIELD_OFFSET] << 8) | headerBytes[TdsEnums.HEADER_LEN_FIELD_OFFSET + 1]) - TdsEnums.HEADER_LEN; | ||
|
|
||
| ArrayPool<byte>.Shared.Return(headerBytes, clearArray: true); | ||
|
|
||
| // read as much from the packet as the caller can accept | ||
| int packetBytesRead; | ||
| { | ||
| ValueTask<int> packetReadValueTask = _stream.ReadAsync(buffer.Slice(0, Math.Min(buffer.Length, _packetBytes)), cancellationToken); | ||
| if (packetReadValueTask.IsCompletedSuccessfully) | ||
| { | ||
| packetBytesRead = packetReadValueTask.Result; | ||
| } | ||
| else | ||
| { | ||
| packetBytesRead = await packetReadValueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
| _packetBytes -= packetBytesRead; | ||
| return packetBytesRead; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public override void Write(ReadOnlySpan<byte> buffer) | ||
| { | ||
| // During the SSL negotiation phase, SSL is tunnelled over TDS packet type 0x12. After | ||
| // negotiation, the underlying socket only sees SSL frames. | ||
| if (!_encapsulate) | ||
| { | ||
| _stream.Write(buffer); | ||
| _stream.Flush(); | ||
| return; | ||
| } | ||
|
|
||
| using (SNIEventScope.Create("<sc.SNI.SslOverTdsStream.Write |SNI|INFO|SCOPE> writing encapsulated bytes")) | ||
| { | ||
| ReadOnlySpan<byte> remaining = buffer; | ||
| byte[] packetBuffer = null; | ||
| try | ||
| { | ||
| while (remaining.Length > 0) | ||
| { | ||
| int dataLength = Math.Min(PACKET_SIZE_WITHOUT_HEADER, remaining.Length); | ||
| int packetLength = TdsEnums.HEADER_LEN + dataLength; | ||
|
|
||
| if (packetBuffer == null) | ||
| { | ||
| packetBuffer = ArrayPool<byte>.Shared.Rent(packetLength); | ||
| } | ||
| else if (packetBuffer.Length < packetLength) | ||
| { | ||
| ArrayPool<byte>.Shared.Return(packetBuffer, clearArray: true); | ||
| packetBuffer = ArrayPool<byte>.Shared.Rent(packetLength); | ||
| } | ||
|
|
||
| SetupPreLoginPacketHeader(packetBuffer, dataLength, remaining.Length - dataLength); | ||
|
|
||
| Span<byte> data = packetBuffer.AsSpan(TdsEnums.HEADER_LEN, dataLength); | ||
| remaining.Slice(0, dataLength).CopyTo(data); | ||
|
|
||
| _stream.Write(packetBuffer.AsSpan(0, packetLength)); | ||
| _stream.Flush(); | ||
|
|
||
| remaining = remaining.Slice(dataLength); | ||
| } | ||
| } | ||
| finally | ||
| { | ||
| if (packetBuffer != null) | ||
| { | ||
| ArrayPool<byte>.Shared.Return(packetBuffer, clearArray: true); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public override async ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| if (!_encapsulate) | ||
| { | ||
| { | ||
| ValueTask valueTask = _stream.WriteAsync(buffer, cancellationToken); | ||
| if (!valueTask.IsCompletedSuccessfully) | ||
| { | ||
| await valueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
| Task flushTask = _stream.FlushAsync(); | ||
| if (flushTask.IsCompletedSuccessfully) | ||
| { | ||
| await flushTask.ConfigureAwait(false); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| using (SNIEventScope.Create("<sc.SNI.SslOverTdsStream.WriteAsync |SNI|INFO|SCOPE> writing encapsulated bytes")) | ||
| { | ||
| ReadOnlyMemory<byte> remaining = buffer; | ||
| byte[] packetBuffer = null; | ||
| try | ||
| { | ||
| while (remaining.Length > 0) | ||
| { | ||
| int dataLength = Math.Min(PACKET_SIZE_WITHOUT_HEADER, remaining.Length); | ||
| int packetLength = TdsEnums.HEADER_LEN + dataLength; | ||
|
|
||
| if (packetBuffer == null) | ||
| { | ||
| packetBuffer = ArrayPool<byte>.Shared.Rent(packetLength); | ||
| } | ||
| else if (packetBuffer.Length < packetLength) | ||
| { | ||
| ArrayPool<byte>.Shared.Return(packetBuffer, clearArray: true); | ||
| packetBuffer = ArrayPool<byte>.Shared.Rent(packetLength); | ||
| } | ||
|
|
||
| SetupPreLoginPacketHeader(packetBuffer, dataLength, remaining.Length - dataLength); | ||
|
|
||
| remaining.Span.Slice(0, dataLength).CopyTo(packetBuffer.AsSpan(TdsEnums.HEADER_LEN, dataLength)); | ||
|
|
||
| { | ||
| ValueTask packetWriteValueTask = _stream.WriteAsync(new ReadOnlyMemory<byte>(packetBuffer, 0, packetLength), cancellationToken); | ||
| if (!packetWriteValueTask.IsCompletedSuccessfully) | ||
| { | ||
| await packetWriteValueTask.ConfigureAwait(false); | ||
| } | ||
| } | ||
|
|
||
| await _stream.FlushAsync().ConfigureAwait(false); | ||
|
|
||
|
|
||
| remaining = remaining.Slice(dataLength); | ||
| } | ||
| } | ||
| finally | ||
| { | ||
| if (packetBuffer != null) | ||
| { | ||
| ArrayPool<byte>.Shared.Return(packetBuffer, clearArray: true); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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