| | | 1 | | using System; |
| | | 2 | | using System.Net.Sockets; |
| | | 3 | | using System.Threading; |
| | | 4 | | using System.Threading.Tasks; |
| | | 5 | | |
| | | 6 | | namespace Renci.SshNet.Connection |
| | | 7 | | { |
| | | 8 | | /// <summary> |
| | | 9 | | /// Represents a connector that uses a proxy server to establish a connection to a given SSH |
| | | 10 | | /// endpoint. |
| | | 11 | | /// </summary> |
| | | 12 | | internal abstract class ProxyConnector : ConnectorBase |
| | | 13 | | { |
| | | 14 | | protected ProxyConnector(ISocketFactory socketFactory) |
| | 429 | 15 | | : base(socketFactory) |
| | 429 | 16 | | { |
| | 429 | 17 | | } |
| | | 18 | | |
| | | 19 | | protected abstract void HandleProxyConnect(IConnectionInfo connectionInfo, Socket socket); |
| | | 20 | | |
| | | 21 | | // ToDo: Performs async/sync fallback, true async version should be implemented in derived classes |
| | | 22 | | protected virtual |
| | | 23 | | #if NET || NETSTANDARD2_1_OR_GREATER |
| | | 24 | | async |
| | | 25 | | #endif // NET || NETSTANDARD2_1_OR_GREATER |
| | | 26 | | Task HandleProxyConnectAsync(IConnectionInfo connectionInfo, Socket socket, CancellationToken cancellationToken) |
| | 0 | 27 | | { |
| | 0 | 28 | | cancellationToken.ThrowIfCancellationRequested(); |
| | | 29 | | |
| | | 30 | | #if NET || NETSTANDARD2_1_OR_GREATER |
| | 0 | 31 | | await using (cancellationToken.Register(o => ((Socket)o).Dispose(), socket, useSynchronizationContext: false |
| | | 32 | | #else |
| | 0 | 33 | | using (cancellationToken.Register(o => ((Socket) o).Dispose(), socket, useSynchronizationContext: false)) |
| | | 34 | | #endif // NET || NETSTANDARD2_1_OR_GREATER |
| | 0 | 35 | | { |
| | | 36 | | #pragma warning disable MA0042 // Do not use blocking calls in an async method; false positive caused by https://github. |
| | 0 | 37 | | HandleProxyConnect(connectionInfo, socket); |
| | | 38 | | #pragma warning restore MA0042 // Do not use blocking calls in an async method |
| | 0 | 39 | | } |
| | | 40 | | |
| | | 41 | | #if !NET && !NETSTANDARD2_1_OR_GREATER |
| | 0 | 42 | | return Task.CompletedTask; |
| | | 43 | | #endif // !NET && !NETSTANDARD2_1_OR_GREATER |
| | 0 | 44 | | } |
| | | 45 | | |
| | | 46 | | /// <summary> |
| | | 47 | | /// Connects to a SSH endpoint using the specified <see cref="IConnectionInfo"/>. |
| | | 48 | | /// </summary> |
| | | 49 | | /// <param name="connectionInfo">The <see cref="IConnectionInfo"/> to use to establish a connection to a SSH end |
| | | 50 | | /// <returns> |
| | | 51 | | /// A <see cref="Socket"/> connected to the SSH endpoint represented by the specified <see cref="IConnectionInfo |
| | | 52 | | /// </returns> |
| | | 53 | | public override Socket Connect(IConnectionInfo connectionInfo) |
| | 417 | 54 | | { |
| | 417 | 55 | | var socket = SocketConnect(connectionInfo.ProxyHost, connectionInfo.ProxyPort, connectionInfo.Timeout); |
| | | 56 | | |
| | | 57 | | try |
| | 348 | 58 | | { |
| | 348 | 59 | | HandleProxyConnect(connectionInfo, socket); |
| | 165 | 60 | | return socket; |
| | | 61 | | } |
| | 183 | 62 | | catch (Exception) |
| | 183 | 63 | | { |
| | 183 | 64 | | socket.Shutdown(SocketShutdown.Both); |
| | 183 | 65 | | socket.Dispose(); |
| | | 66 | | |
| | 183 | 67 | | throw; |
| | | 68 | | } |
| | 165 | 69 | | } |
| | | 70 | | |
| | | 71 | | /// <summary> |
| | | 72 | | /// Asynchronously connects to a SSH endpoint using the specified <see cref="IConnectionInfo"/>. |
| | | 73 | | /// </summary> |
| | | 74 | | /// <param name="connectionInfo">The <see cref="IConnectionInfo"/> to use to establish a connection to a SSH end |
| | | 75 | | /// <param name="cancellationToken">The token to monitor for cancellation requests.</param> |
| | | 76 | | /// <returns> |
| | | 77 | | /// A <see cref="Socket"/> connected to the SSH endpoint represented by the specified <see cref="IConnectionInfo |
| | | 78 | | /// </returns> |
| | | 79 | | public override async Task<Socket> ConnectAsync(IConnectionInfo connectionInfo, CancellationToken cancellationTo |
| | 3 | 80 | | { |
| | 3 | 81 | | var socket = await SocketConnectAsync(connectionInfo.ProxyHost, connectionInfo.ProxyPort, cancellationToken) |
| | | 82 | | |
| | | 83 | | try |
| | 0 | 84 | | { |
| | 0 | 85 | | await HandleProxyConnectAsync(connectionInfo, socket, cancellationToken).ConfigureAwait(false); |
| | 0 | 86 | | return socket; |
| | | 87 | | } |
| | 0 | 88 | | catch (Exception) |
| | 0 | 89 | | { |
| | 0 | 90 | | socket.Shutdown(SocketShutdown.Both); |
| | 0 | 91 | | socket.Dispose(); |
| | | 92 | | |
| | 0 | 93 | | throw; |
| | | 94 | | } |
| | 0 | 95 | | } |
| | | 96 | | } |
| | | 97 | | } |