/// <param name="torSocks5EndPoint">Opt out Tor with null.</param>
        public static async Task <bool> IsTorRunningAsync(EndPoint torSocks5EndPoint)
        {
            using var client = new TorSocks5Client(torSocks5EndPoint);
            try
            {
                await client.ConnectAsync().ConfigureAwait(false);

                await client.HandshakeAsync().ConfigureAwait(false);
            }
            catch (ConnectionException)
            {
                return(false);
            }
            return(true);
        }
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        public async Task <bool> IsTorRunningAsync()
        {
            using (var client = new TorSocks5Client(TorSocks5EndPoint))
            {
                try
                {
                    await client.ConnectAsync();

                    await client.HandshakeAsync();
                }
                catch (ConnectionException)
                {
                    return(false);
                }
                return(true);
            }
        }
Esempio n. 3
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        /// <remarks>
        /// Throws OperationCancelledException if <paramref name="cancel"/> is set.
        /// </remarks>
        private async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancel = default)
        {
            Guard.NotNull(nameof(request), request);

            // https://tools.ietf.org/html/rfc7230#section-2.7.1
            // A sender MUST NOT generate an "http" URI with an empty host identifier.
            var host = Guard.NotNullOrEmptyOrWhitespace($"{nameof(request)}.{nameof(request.RequestUri)}.{nameof(request.RequestUri.DnsSafeHost)}", request.RequestUri.DnsSafeHost, trim: true);

            // https://tools.ietf.org/html/rfc7230#section-2.6
            // Intermediaries that process HTTP messages (i.e., all intermediaries
            // other than those acting as tunnels) MUST send their own HTTP - version
            // in forwarded messages.
            request.Version = HttpProtocol.HTTP11.Version;

            if (TorSocks5Client != null && !TorSocks5Client.IsConnected)
            {
                TorSocks5Client?.Dispose();
                TorSocks5Client = null;
            }

            if (TorSocks5Client == null || !TorSocks5Client.IsConnected)
            {
                TorSocks5Client = new TorSocks5Client(TorSocks5EndPoint);
                await TorSocks5Client.ConnectAsync();

                await TorSocks5Client.HandshakeAsync(IsolateStream);

                await TorSocks5Client.ConnectToDestinationAsync(host, request.RequestUri.Port);

                Stream stream = TorSocks5Client.TcpClient.GetStream();
                if (request.RequestUri.Scheme == "https")
                {
                    SslStream sslStream;
                    // On Linux and OSX ignore certificate, because of a .NET Core bug
                    // This is a security vulnerability, has to be fixed as soon as the bug get fixed
                    // Details:
                    // https://github.com/dotnet/corefx/issues/21761
                    // https://github.com/nopara73/DotNetTor/issues/4
                    if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                    {
                        sslStream = new SslStream(
                            stream,
                            leaveInnerStreamOpen: true);
                    }
                    else
                    {
                        sslStream = new SslStream(
                            stream,
                            leaveInnerStreamOpen: true,
                            userCertificateValidationCallback: (a, b, c, d) => true);
                    }

                    await sslStream
                    .AuthenticateAsClientAsync(
                        host,
                        new X509CertificateCollection(),
                        SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12,
                        checkCertificateRevocation : true);

                    stream = sslStream;
                }

                TorSocks5Client.Stream = stream;
            }
            cancel.ThrowIfCancellationRequested();

            // https://tools.ietf.org/html/rfc7230#section-3.3.2
            // A user agent SHOULD send a Content - Length in a request message when
            // no Transfer-Encoding is sent and the request method defines a meaning
            // for an enclosed payload body.For example, a Content - Length header
            // field is normally sent in a POST request even when the value is 0
            // (indicating an empty payload body).A user agent SHOULD NOT send a
            // Content - Length header field when the request message does not contain
            // a payload body and the method semantics do not anticipate such a
            // body.
            if (request.Method == HttpMethod.Post)
            {
                if (request.Headers.TransferEncoding.Count == 0)
                {
                    if (request.Content == null)
                    {
                        request.Content = new ByteArrayContent(new byte[] { });                         // dummy empty content
                        request.Content.Headers.ContentLength = 0;
                    }
                    else
                    {
                        if (request.Content.Headers.ContentLength == null)
                        {
                            request.Content.Headers.ContentLength = (await request.Content.ReadAsStringAsync()).Length;
                        }
                    }
                }
            }

            var requestString = await request.ToHttpStringAsync();

            var bytes = Encoding.UTF8.GetBytes(requestString);

            await TorSocks5Client.Stream.WriteAsync(bytes, 0, bytes.Length);

            await TorSocks5Client.Stream.FlushAsync();

            using (var httpResponseMessage = new HttpResponseMessage())
            {
                return(await HttpResponseMessageExtensions.CreateNewAsync(TorSocks5Client.Stream, request.Method));
            }
        }