# HadoopDFS Class

The HadoopDFS class provides easy access to files stored in HDFS clusters.

## Syntax

```text
HadoopDFS
```

## Remarks

The HadoopDFS class offers an easy-to-use API compatible with any Hadoop distributed file system (HDFS) cluster that exposes Hadoop's standard WebHDFS REST API. Capabilities include uploading and downloading files, strong encryption support, creating folders, file manipulation and organization, and more.

## Authentication

First, set the [URL](#url-property-hadoopdfs-class) property to the base WebHDFS URL of the server (see [URL](#url-property-hadoopdfs-class) for more details).

Depending on how the server is configured, there are a few different authentication mechanisms that might be used; or, the server might not require authentication at all). Refer to the [AuthMechanism](#authmechanism-property-hadoopdfs-class) property for more information about configuring the class to authenticate correctly.

## Addressing Resources

HDFS addresses resources (files, directories, and symlinks) using Linux-style absolute paths. Unless otherwise specified, the class always works in terms of absolute paths, and will always prepend a forward slash (*/*) to any path passed to it that does not already start with one.

## Listing Directory Contents

[ListResources](#listresources-method-hadoopdfs-class) lists resources (files, directories, and symlinks) within the specified directory. Calling this method will fire the [ResourceList](#resourcelist-event-hadoopdfs-class) event once for each resource, and will also populate the [Resources](#resources-property-hadoopdfs-class) collection.

```text
// ResourceList event handler.
hdfs.OnResourceList += (s, e) => {
  Console.WriteLine(e.Name);
};

hdfs.ListResources("/work_files/serious_business/cats");

for (int i = 0; i < hdfs.Resources.Count; i++) {
  // Process resources here.
}
```

## Downloading Files

The [DownloadFile](#downloadfile-method-hadoopdfs-class) method downloads files.

If a stream has been specified using [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class), the file data will be sent through it. If a stream is not specified, and [LocalFile](#localfile-property-hadoopdfs-class) is set, the file will be saved to the specified location; otherwise, the file data will be held by [ResourceData](#resourcedata-property-hadoopdfs-class).

To download and decrypt an encrypted file, set [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) and [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class) before calling this method.

### Download Notes

In the simplest use-case, downloading a file looks like this:

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

**Resuming Downloads**

The class also supports resuming failed downloads by using the [StartByte](#startbyte-property-hadoopdfs-class) property. If a download is interrupted, set [StartByte](#startbyte-property-hadoopdfs-class) to the appropriate offset before calling this method to resume the download.

```text
string downloadFile = "../MyFile.zip";
hdfs.LocalFile = downloadFile;
hdfs.DownloadFile(hdfs.Resources[0].Path);

//The transfer is interrupted and DownloadFile() above fails. Later, resume the download:

//Get the size of the partially downloaded file
hdfs.StartByte = new FileInfo(downloadFile).Length;
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

**Resuming Encrypted File Downloads**

Resuming encrypted file downloads is only supported when [LocalFile](#localfile-property-hadoopdfs-class) was set in the initial download attempt.

If [LocalFile](#localfile-property-hadoopdfs-class) is set when beginning an encrypted download, the class creates a temporary file in [TempPath](#TempPath) to hold the encrypted data until the download is complete. If the download is interrupted, [DownloadTempFile](#DownloadTempFile) will be populated with the path of the temporary file that holds the partial data.

To resume, [DownloadTempFile](#DownloadTempFile) must be populated, along with [StartByte](#startbyte-property-hadoopdfs-class), to allow the remainder of the encrypted data to be downloaded. Once the encrypted data is downloaded it will be decrypted and written to [LocalFile](#localfile-property-hadoopdfs-class).

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.EncryptionPassword = "password";
hdfs.DownloadFile(hdfs.Resources[0].Path);

//The transfer is interrupted and DownloadFile() above fails. Later, resume the download:

//Get the size of the partially download temp file
hdfs.StartByte = new FileInfo(hdfs.Config("DownloadTempFile")).Length;
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

## Uploading Files

The [UploadFile](#uploadfile-method-hadoopdfs-class) method uploads new files.

If [SetUploadStream](#setuploadstream-method-hadoopdfs-class) has been used to set an upload stream, it will take priority as the file data source. If [LocalFile](#localfile-property-hadoopdfs-class) is set the file will be uploaded from the specified path. If [LocalFile](#localfile-property-hadoopdfs-class) is not set the data in [ResourceData](#resourcedata-property-hadoopdfs-class) will be used.

To encrypt the file before uploading it, set [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) and [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class).

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.UploadFile("/MyFile.zip");
```

## Additional Functionality

The HadoopDFS class offers advanced functionality beyond simple uploads and downloads. For instance:

- Encrypt and decrypt files using the [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) and [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class) properties.
- Basic file and folder manipulation and organization using methods such as [AppendFile](#appendfile-method-hadoopdfs-class), [DeleteResource](#deleteresource-method-hadoopdfs-class), [MakeDirectory](#makedirectory-method-hadoopdfs-class), [MoveResource](#moveresource-method-hadoopdfs-class), and [TruncateFile](#truncatefile-method-hadoopdfs-class).
- Advanced file and directory manipulation with [SetFileReplication](#setfilereplication-method-hadoopdfs-class), [SetOwner](#setowner-method-hadoopdfs-class), [SetPermission](#setpermission-method-hadoopdfs-class), and [SetTimes](#settimes-method-hadoopdfs-class).
- Retrieval of both general file/directory information, as well as directory quota information, using [GetResourceInfo](#getresourceinfo-method-hadoopdfs-class) and [GetDirSummary](#getdirsummary-method-hadoopdfs-class).
- Execute any arbitrary WebHDFS operation with ease using the [DoCustomOp](#docustomop-method-hadoopdfs-class) method.
- And more!

## Property List

*The following is the full list of the properties of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [AuthMechanism](#authmechanism-property-hadoopdfs-class) | The authentication mechanism to use when connecting to the server. |
| [Authorization](#authorization-property-hadoopdfs-class) | The OAuth 2.0 authorization token. |
| [DirSummary](#dirsummary-property-hadoopdfs-class) | Directory content summary information. |
| [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) | The encryption algorithm. |
| [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class) | The encryption password. |
| [Firewall](#firewall-property-hadoopdfs-class) | A set of properties related to firewall access. |
| [Idle](#idle-property-hadoopdfs-class) | The current status of the class. |
| [LocalFile](#localfile-property-hadoopdfs-class) | The location of the local file. |
| [LocalHost](#localhost-property-hadoopdfs-class) | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| [OtherHeaders](#otherheaders-property-hadoopdfs-class) | Other headers as determined by the user (optional). |
| [Overwrite](#overwrite-property-hadoopdfs-class) | Whether to overwrite the local or remote file. |
| [ParsedHeaders](#parsedheaders-property-hadoopdfs-class) | This property includes a collection of headers returned from the last request. |
| [Password](#password-property-hadoopdfs-class) | The password to use for authentication. |
| [Proxy](#proxy-property-hadoopdfs-class) | A set of properties related to proxy access. |
| [QueryParams](#queryparams-property-hadoopdfs-class) | Additional query parameters to be included in the request. |
| [ReadBytes](#readbytes-property-hadoopdfs-class) | The number of bytes to read when downloading a file. |
| [ResourceData](#resourcedata-property-hadoopdfs-class) | The data that was downloaded, or that should be uploaded. |
| [Resources](#resources-property-hadoopdfs-class) | A collection of resources. |
| [SSLAcceptServerCert](#sslacceptservercert-property-hadoopdfs-class) | Instructs the class to unconditionally accept the server certificate that matches the supplied certificate. |
| [SSLCert](#sslcert-property-hadoopdfs-class) | The certificate to be used during Secure Sockets Layer (SSL) negotiation. |
| [SSLProvider](#sslprovider-property-hadoopdfs-class) | The Secure Sockets Layer/Transport Layer Security (SSL/TLS) implementation to use. |
| [SSLServerCert](#sslservercert-property-hadoopdfs-class) | The server certificate for the last established connection. |
| [StartByte](#startbyte-property-hadoopdfs-class) | The byte offset from which to start downloading a file. |
| [Timeout](#timeout-property-hadoopdfs-class) | The timeout for the class. |
| [URL](#url-property-hadoopdfs-class) | The URL of the Hadoop WebHDFS server. |
| [User](#user-property-hadoopdfs-class) | The user name to use for authentication. |

## Method List

*The following is the full list of the methods of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [AddQueryParam](#addqueryparam-method-hadoopdfs-class) | Adds a query parameter to the QueryParams properties. |
| [AppendFile](#appendfile-method-hadoopdfs-class) | Appends data to an existing file. |
| [Config](#config-method-hadoopdfs-class) | Sets or retrieves a configuration setting. |
| [DeleteResource](#deleteresource-method-hadoopdfs-class) | Deletes a resource. |
| [DoCustomOp](#docustomop-method-hadoopdfs-class) | Executes an arbitrary WebHDFS operation. |
| [DownloadFile](#downloadfile-method-hadoopdfs-class) | Downloads a file. |
| [GetDirSummary](#getdirsummary-method-hadoopdfs-class) | Gets a content summary for a directory. |
| [GetResourceInfo](#getresourceinfo-method-hadoopdfs-class) | Gets information about a specific resource. |
| [Interrupt](#interrupt-method-hadoopdfs-class) | This method interrupts the current method. |
| [JoinFileBlocks](#joinfileblocks-method-hadoopdfs-class) | Joins multiple files' blocks together into one file. |
| [ListResources](#listresources-method-hadoopdfs-class) | Lists resources in a given directory. |
| [MakeDirectory](#makedirectory-method-hadoopdfs-class) | Makes a directory. |
| [MoveResource](#moveresource-method-hadoopdfs-class) | Moves a resource. |
| [Reset](#reset-method-hadoopdfs-class) | Resets the class to its initial state. |
| [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class) | Sets the stream to which downloaded data will be written. |
| [SetFileReplication](#setfilereplication-method-hadoopdfs-class) | Sets the replication factor for a file. |
| [SetOwner](#setowner-method-hadoopdfs-class) | Sets a resource's owner and/or group. |
| [SetPermission](#setpermission-method-hadoopdfs-class) | Assigns the given permission to a resource. |
| [SetTimes](#settimes-method-hadoopdfs-class) | Sets a resource's modification and/or access times. |
| [SetUploadStream](#setuploadstream-method-hadoopdfs-class) | Sets the stream from which data is read when uploading. |
| [TruncateFile](#truncatefile-method-hadoopdfs-class) | Truncates a file to a given size. |
| [UploadFile](#uploadfile-method-hadoopdfs-class) | Uploads a file. |

## Event List

*The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [EndTransfer](#endtransfer-event-hadoopdfs-class) | Fired when a document finishes transferring. |
| [Error](#error-event-hadoopdfs-class) | Fired when information is available about errors during data delivery. |
| [Header](#header-event-hadoopdfs-class) | Fired every time a header line comes in. |
| [Log](#log-event-hadoopdfs-class) | Fired once for each log message. |
| [Progress](#progress-event-hadoopdfs-class) | Fires during an upload or download to indicate transfer progress. |
| [ResourceList](#resourcelist-event-hadoopdfs-class) | Fires once for each resource returned when listing resources. |
| [SSLServerAuthentication](#sslserverauthentication-event-hadoopdfs-class) | Fired after the server presents its certificate to the client. |
| [SSLStatus](#sslstatus-event-hadoopdfs-class) | Fired when secure connection progress messages are available. |
| [StartTransfer](#starttransfer-event-hadoopdfs-class) | Fired when a document starts transferring (after the headers). |
| [Transfer](#transfer-event-hadoopdfs-class) | Fired while a document transfers (delivers document). |

## Config Settings

*The following is a list of config settings for the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [CreatePermission](#CreatePermission) | The permission to assign when creating resources. |
| [DownloadTempFile](#DownloadTempFile) | The temporary file used when downloading encrypted data. |
| [EncryptionIV](#EncryptionIV) | The initialization vector to be used for encryption/decryption. |
| [EncryptionKey](#EncryptionKey) | The key to use during encryption/decryption. |
| [EncryptionPasswordKDF](#EncryptionPasswordKDF) | The KDF algorithm to use during password based encryption and decryption. |
| [HomeDir](#HomeDir) | Can be queried to obtain the current user's home directory path. |
| [ProgressAbsolute](#ProgressAbsolute) | Whether the class should track transfer progress absolutely. |
| [ProgressStep](#ProgressStep) | How often the progress event should be fired, in terms of percentage. |
| [RawRequest](#RawRequest) | Returns the data that was sent to the server. |
| [RawResponse](#RawResponse) | Returns the data that was received from the server. |
| [RecursiveDelete](#RecursiveDelete) | Whether to recursively delete non-empty directories. |
| [TempPath](#TempPath) | The path to the directory where temporary files are created. |
| [XChildCount](#XChildCount) | The number of child elements of the current element. |
| [XChildName\[i\]](#XChildName[i]) | The name of the child element. |
| [XChildXText\[i\]](#XChildXText[i]) | The inner text of the child element. |
| [XElement](#XElement) | The name of the current element. |
| [XParent](#XParent) | The parent of the current element. |
| [XPath](#XPath) | Provides a way to point to a specific element in the returned XML or JSON response. |
| [XSubTree](#XSubTree) | A snapshot of the current element in the document. |
| [XText](#XText) | The text of the current element. |
| [AcceptEncoding](#AcceptEncoding) | Used to tell the server which types of content encodings the client supports. |
| [AllowHTTPCompression](#AllowHTTPCompression) | This property enables HTTP compression for receiving data. |
| [AllowHTTPFallback](#AllowHTTPFallback) | Whether HTTP/2 connections are permitted to fallback to HTTP/1.1. |
| [Append](#Append) | Whether to append data to LocalFile. |
| [Authorization](#Authorization) | The Authorization string to be sent to the server. |
| [BytesTransferred](#BytesTransferred) | Contains the number of bytes transferred in the response data. |
| [ChunkSize](#ChunkSize) | Specifies the chunk size in bytes when using chunked encoding. |
| [CompressHTTPRequest](#CompressHTTPRequest) | Set to true to compress the body of a PUT or POST request. |
| [EncodeURL](#EncodeURL) | If set to True the URL will be encoded by the class. |
| [FollowRedirects](#FollowRedirects) | Determines what happens when the server issues a redirect. |
| [GetOn302Redirect](#GetOn302Redirect) | If set to True the class will perform a GET on the new location. |
| [HTTP2HeadersWithoutIndexing](#HTTP2HeadersWithoutIndexing) | HTTP2 headers that should not update the dynamic header table with incremental indexing. |
| [HTTPVersion](#HTTPVersion) | The version of HTTP used by the class. |
| [IfModifiedSince](#IfModifiedSince) | A date determining the maximum age of the desired document. |
| [KeepAlive](#KeepAlive) | Determines whether the HTTP connection is closed after completion of the request. |
| [KerberosSPN](#KerberosSPN) | The Service Principal Name for the Kerberos Domain Controller. |
| [LogLevel](#LogLevel) | The level of detail that is logged. |
| [MaxRedirectAttempts](#MaxRedirectAttempts) | Limits the number of redirects that are followed in a request. |
| [NegotiatedHTTPVersion](#NegotiatedHTTPVersion) | The negotiated HTTP version. |
| [OtherHeaders](#OtherHeaders) | Other headers as determined by the user (optional). |
| [ProxyAuthorization](#ProxyAuthorization) | The authorization string to be sent to the proxy server. |
| [ProxyAuthScheme](#ProxyAuthScheme) | The authorization scheme to be used for the proxy. |
| [ProxyPassword](#ProxyPassword) | A password if authentication is to be used for the proxy. |
| [ProxyPort](#ProxyPort) | Port for the proxy server (default 80). |
| [ProxyServer](#ProxyServer) | Name or IP address of a proxy server (optional). |
| [ProxyUser](#ProxyUser) | A user name if authentication is to be used for the proxy. |
| [SentHeaders](#SentHeaders) | The full set of headers as sent by the client. |
| [StatusCode](#StatusCode) | The status code of the last response from the server. |
| [StatusLine](#StatusLine) | The first line of the last response from the server. |
| [TransferredData](#TransferredData) | The contents of the last response from the server. |
| [TransferredDataLimit](#TransferredDataLimit) | The maximum number of incoming bytes to be stored by the class. |
| [TransferredHeaders](#TransferredHeaders) | The full set of headers as received from the server. |
| [TransferredRequest](#TransferredRequest) | The full request as sent by the client. |
| [UseChunkedEncoding](#UseChunkedEncoding) | Enables or Disables HTTP chunked encoding for transfers. |
| [UseIDNs](#UseIDNs) | Whether to encode hostnames to internationalized domain names. |
| [UsePlatformHTTPClient](#UsePlatformHTTPClient) | Whether or not to use the platform HTTP client. |
| [UseProxyAutoConfigURL](#UseProxyAutoConfigURL) | Whether to use a Proxy auto-config file when attempting a connection. |
| [UserAgent](#UserAgent) | Information about the user agent (browser). |
| [ConnectionTimeout](#ConnectionTimeout) | Sets a separate timeout value for establishing a connection. |
| [FirewallAutoDetect](#FirewallAutoDetect) | Tells the class whether or not to automatically detect and use firewall system settings, if available. |
| [FirewallHost](#FirewallHost) | Name or IP address of firewall (optional). |
| [FirewallHTTPVersion](#FirewallHTTPVersion) | The HTTP version to be used when connecting through a tunneling proxy. |
| [FirewallPassword](#FirewallPassword) | Password to be used if authentication is to be used when connecting through the firewall. |
| [FirewallPort](#FirewallPort) | The TCP port for the FirewallHost;. |
| [FirewallType](#FirewallType) | Determines the type of firewall to connect through. |
| [FirewallUser](#FirewallUser) | A user name if authentication is to be used connecting through a firewall. |
| [KeepAliveInterval](#KeepAliveInterval) | The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received. |
| [KeepAliveRetryCount](#KeepAliveRetryCount) | The number of keep-alive packets to be sent before the remotehost is considered disconnected. |
| [KeepAliveTime](#KeepAliveTime) | The inactivity time in milliseconds before a TCP keep-alive packet is sent. |
| [Linger](#Linger) | When set to True, connections are terminated gracefully. |
| [LingerTime](#LingerTime) | Time in seconds to have the connection linger. |
| [LocalHost](#LocalHost) | The name of the local host through which connections are initiated or accepted. |
| [LocalPort](#LocalPort) | The port in the local host where the class binds. |
| [MaxLineLength](#MaxLineLength) | The maximum amount of data to accumulate when no EOL is found. |
| [MaxTransferRate](#MaxTransferRate) | The transfer rate limit in bytes per second. |
| [ProxyExceptionsList](#ProxyExceptionsList) | A semicolon separated list of hosts and IPs to bypass when using a proxy. |
| [TCPKeepAlive](#TCPKeepAlive) | Determines whether or not the keep alive socket option is enabled. |
| [TcpNoDelay](#TcpNoDelay) | Whether or not to delay when sending packets. |
| [UseIPv6](#UseIPv6) | Whether to use IPv6. |
| [UseNTLMv2](#UseNTLMv2) | Whether to use NTLM V2. |
| [LogSSLPackets](#LogSSLPackets) | Controls whether SSL packets are logged when using the internal security API. |
| [OpenSSLCADir](#OpenSSLCADir) | The path to a directory containing CA certificates. |
| [OpenSSLCAFile](#OpenSSLCAFile) | Name of the file containing the list of CA's trusted by your application. |
| [OpenSSLCipherList](#OpenSSLCipherList) | A string that controls the ciphers to be used by SSL. |
| [OpenSSLPrngSeedData](#OpenSSLPrngSeedData) | The data to seed the pseudo random number generator (PRNG). |
| [ReuseSSLSession](#ReuseSSLSession) | Determines if the SSL session is reused. |
| [SSLCACertFilePaths](#SSLCACertFilePaths) | The paths to CA certificate files on Unix/Linux. |
| [SSLCACerts](#SSLCACerts) | A newline separated list of CA certificates to be included when performing an SSL handshake. |
| [SSLCipherStrength](#SSLCipherStrength) | The minimum cipher strength used for bulk encryption. |
| [SSLClientCACerts](#SSLClientCACerts) | A newline separated list of CA certificates to use during SSL client certificate validation. |
| [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) | The cipher suite to be used in an SSL negotiation. |
| [SSLEnabledProtocols](#SSLEnabledProtocols) | Used to enable/disable the supported security protocols. |
| [SSLEnableRenegotiation](#SSLEnableRenegotiation) | Whether the renegotiation_info SSL extension is supported. |
| [SSLIncludeCertChain](#SSLIncludeCertChain) | Whether the entire certificate chain is included in the SSLServerAuthentication event. |
| [SSLKeyLogFile](#SSLKeyLogFile) | The location of a file where per-session secrets are written for debugging purposes. |
| [SSLNegotiatedCipher](#SSLNegotiatedCipher) | Returns the negotiated cipher suite. |
| [SSLNegotiatedCipherStrength](#SSLNegotiatedCipherStrength) | Returns the negotiated cipher suite strength. |
| [SSLNegotiatedCipherSuite](#SSLNegotiatedCipherSuite) | Returns the negotiated cipher suite. |
| [SSLNegotiatedKeyExchange](#SSLNegotiatedKeyExchange) | Returns the negotiated key exchange algorithm. |
| [SSLNegotiatedKeyExchangeStrength](#SSLNegotiatedKeyExchangeStrength) | Returns the negotiated key exchange algorithm strength. |
| [SSLNegotiatedVersion](#SSLNegotiatedVersion) | Returns the negotiated protocol version. |
| [SSLSecurityFlags](#SSLSecurityFlags) | Flags that control certificate verification. |
| [SSLServerCACerts](#SSLServerCACerts) | A newline separated list of CA certificates to use during SSL server certificate validation. |
| [TLS12SignatureAlgorithms](#TLS12SignatureAlgorithms) | Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal. |
| [TLS12SupportedGroups](#TLS12SupportedGroups) | The supported groups for ECC. |
| [TLS13KeyShareGroups](#TLS13KeyShareGroups) | The groups for which to pregenerate key shares. |
| [TLS13SignatureAlgorithms](#TLS13SignatureAlgorithms) | The allowed certificate signature algorithms. |
| [TLS13SupportedGroups](#TLS13SupportedGroups) | The supported groups for (EC)DHE key exchange. |
| [AbsoluteTimeout](#AbsoluteTimeout) | Determines whether timeouts are inactivity timeouts or absolute timeouts. |
| [FirewallData](#FirewallData) | Used to send extra data to the firewall. |
| [InBufferSize](#InBufferSize) | The size in bytes of the incoming queue of the socket. |
| [OutBufferSize](#OutBufferSize) | The size in bytes of the outgoing queue of the socket. |
| [BuildInfo](#BuildInfo) | Information about the product's build. |
| [CodePage](#CodePage) | The system code page used for Unicode to Multibyte translations. |
| [LicenseInfo](#LicenseInfo) | Information about the current license. |
| [MaskSensitiveData](#MaskSensitiveData) | Whether sensitive data is masked in log messages. |
| [ProcessIdleEvents](#ProcessIdleEvents) | Whether the class uses its internal event loop to process events when the main thread is idle. |
| [SelectWaitMillis](#SelectWaitMillis) | The length of time in milliseconds the class will wait when DoEvents is called if there are no events to process. |
| [UseFIPSCompliantAPI](#UseFIPSCompliantAPI) | Tells the class whether or not to use FIPS certified APIs. |
| [UseInternalSecurityAPI](#UseInternalSecurityAPI) | Whether or not to use the system security libraries or an internal implementation. |

# AuthMechanism Property ([HadoopDFS](#hadoopdfs-class) Class)

The authentication mechanism to use when connecting to the server.

## Syntax

```text
ANSI (Cross Platform)
int GetAuthMechanism();int SetAuthMechanism(int iAuthMechanism);

Unicode (Windows)
INT GetAuthMechanism();INT SetAuthMechanism(INT iAuthMechanism);
```

## Possible Values

```text
AM_NONE(0), AM_SIMPLE(1), AM_BASIC(2), AM_NTLM(3), AM_NEGOTIATE(4), AM_OAUTH(5)
```

## Default Value

0

## Remarks

This property controls what authentication mechanism the class should use when connecting to the server.

Possible values are:

|  |  |
| --- | --- |
| 0 (amNone - default) | No authentication is performed. |
| 1 (amSimple) | Hadoop pseudo/simple authentication is performed. |
| 2 (amBasic) | Basic authentication is performed. |
| 3 (amNTLM) | NTLM authentication is performed. |
| 4 (amNegotiate) | Negotiate authentication is performed. |
| 5 (amOAuth) | OAuth authentication is performed. |

When set to *1 (amSimple)*, the value of the [User](#user-property-hadoopdfs-class) property is automatically sent in every request using the *user.name* query parameter.

When set to *2 (amBasic)*, *3 (amNTLM)*, or *4 (amNegotiate)*, the values held by the [User](#user-property-hadoopdfs-class) and [Password](#password-property-hadoopdfs-class) properties will be used to perform Basic, NTLM, or Negotiate (e.g., Kerberos SPNEGO) authentication.

When set to *5 (amOAuth)*, the value of the [Authorization](#authorization-property-hadoopdfs-class) property is automatically sent in every request using the *Authorization* HTTP header.

## Data Type

Integer

# Authorization Property ([HadoopDFS](#hadoopdfs-class) Class)

The OAuth 2.0 authorization token.

## Syntax

```text
ANSI (Cross Platform)
char* GetAuthorization();int SetAuthorization(const char* lpszAuthorization);

Unicode (Windows)
LPWSTR GetAuthorization();INT SetAuthorization(LPCWSTR lpszAuthorization);
```

## Default Value

""

## Remarks

This property is used to specify the OAuth 2.0 authorization token that was obtained as a result of performing OAuth. A valid OAuth token will come in the following format:

```text
Bearer ACCESS_TOKEN
```

The *ACCESS_TOKEN* segment must be supplied to this property before attempting any other operations. Consult the documentation for the service for more information about supported scope values and more details on performing OAuth.

Refer to [AuthMechanism](#authmechanism-property-hadoopdfs-class) for more information.

## Data Type

String

# DirSummary Property ([HadoopDFS](#hadoopdfs-class) Class)

Directory content summary information.

## Syntax

```text
CloudStorageHDFSDirSummary* GetDirSummary();
```

## Remarks

This property holds an [HDFSDirSummary](#hdfsdirsummary-type) object with information about a directory's content summary; it's populated after calling [GetDirSummary](#getdirsummary-method-hadoopdfs-class).

This property is read-only and not available at design time.

## Data Type

[CloudStorageHDFSDirSummary](#hdfsdirsummary-type)

# EncryptionAlgorithm Property ([HadoopDFS](#hadoopdfs-class) Class)

The encryption algorithm.

## Syntax

```text
ANSI (Cross Platform)
int GetEncryptionAlgorithm();int SetEncryptionAlgorithm(int iEncryptionAlgorithm);

Unicode (Windows)
INT GetEncryptionAlgorithm();INT SetEncryptionAlgorithm(INT iEncryptionAlgorithm);
```

## Possible Values

```text
EA_AES(0), EA_BLOWFISH(1), EA_CAST(2), EA_DES(3), EA_IDEA(4), EA_RC2(5), EA_RC4(6), EA_TEA(7), EA_TRIPLE_DES(8), EA_TWOFISH(9), EA_RIJNDAEL(10), EA_CHA_CHA(11), EA_XSALSA_20(12)
```

## Default Value

0

## Remarks

This property specifies the encryption algorithm to be used. The maximum allowable key size is automatically used for the selected algorithm. Possible values are:

| Algorithm | Key Size |
| --- | --- |
| 0 (eaAES - default) | 256 |
| 1 (eaBlowfish) | 448 |
| 2 (eaCAST) | 128 |
| 3 (eaDES) | 64 |
| 4 (eaIDEA) | 128 |
| 5 (eaRC2) | 128 |
| 6 (eaRC4) | 2048 |
| 7 (eaTEA) | 128 |
| 8 (eaTripleDES) | 192 |
| 9 (eaTwofish) | 256 |
| 10 (eaRijndael) | 256 |
| 11 (eaChaCha) | 256 |
| 12 (eaXSalsa20) | 256 |

## Data Type

Integer

# EncryptionPassword Property ([HadoopDFS](#hadoopdfs-class) Class)

The encryption password.

## Syntax

```text
ANSI (Cross Platform)
char* GetEncryptionPassword();int SetEncryptionPassword(const char* lpszEncryptionPassword);

Unicode (Windows)
LPWSTR GetEncryptionPassword();INT SetEncryptionPassword(LPCWSTR lpszEncryptionPassword);
```

## Default Value

""

## Remarks

If this property is populated when [UploadFile](#uploadfile-method-hadoopdfs-class) or [DownloadFile](#downloadfile-method-hadoopdfs-class) is called, the class will attempt to encrypt or decrypt the data before uploading or after downloading it.

The class uses the value specified here to generate the necessary encryption Key and IV values using the PKCS5 password digest algorithm. This provides a simpler alternative to creating and managing Key and IV values directly.

However, it is also possible to explicitly specify the Key and IV values to use by setting the [EncryptionKey](#EncryptionKey) and [EncryptionIV](#EncryptionIV) configuration settings. This may be necessary if, e.g., the data needs to be encrypted/decrypted by another utility which generates Key and IV values differently.

This property is not available at design time.

## Data Type

String

# Firewall Property ([HadoopDFS](#hadoopdfs-class) Class)

A set of properties related to firewall access.

## Syntax

```text
CloudStorageFirewall* GetFirewall();
int SetFirewall(CloudStorageFirewall* val);
```

## Remarks

This is a [Firewall](#firewall-type)-type property, which contains fields describing the firewall through which the class will attempt to connect.

## Data Type

[CloudStorageFirewall](#firewall-type)

# Idle Property ([HadoopDFS](#hadoopdfs-class) Class)

The current status of the class.

## Syntax

```text
ANSI (Cross Platform)
int GetIdle();

Unicode (Windows)
BOOL GetIdle();
```

## Default Value

TRUE

## Remarks

This property will be False if the component is currently busy (communicating or waiting for an answer), and True at all other times.

This property is read-only.

## Data Type

Boolean

# LocalFile Property ([HadoopDFS](#hadoopdfs-class) Class)

The location of the local file.

## Syntax

```text
ANSI (Cross Platform)
char* GetLocalFile();wchar_t* GetLocalFile_W(); // Windows onlyint SetLocalFile(const char* lpszLocalFile);int SetLocalFile(const wchar_t* lpszLocalFile); // Windows only

Unicode (Windows)
LPWSTR GetLocalFile();INT SetLocalFile(LPCWSTR lpszLocalFile);
```

## Default Value

""

## Remarks

This property specifies the location of a file on disk. This is used as the source file when calling [UploadFile](#uploadfile-method-hadoopdfs-class) or [AppendFile](#appendfile-method-hadoopdfs-class), and as the destination file when calling [DownloadFile](#downloadfile-method-hadoopdfs-class) or [DoCustomOp](#docustomop-method-hadoopdfs-class).

Note: Setting this property to a non-empty value will discard any streams set using [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class) and [SetUploadStream](#setuploadstream-method-hadoopdfs-class). Similarly, passing a non-null value to either of the aforementioned methods will clear this property.

## Data Type

String

# LocalHost Property ([HadoopDFS](#hadoopdfs-class) Class)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

## Syntax

```text
ANSI (Cross Platform)
char* GetLocalHost();int SetLocalHost(const char* lpszLocalHost);

Unicode (Windows)
LPWSTR GetLocalHost();INT SetLocalHost(LPCWSTR lpszLocalHost);
```

## Default Value

""

## Remarks

This property contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the class initiate connections (or accept in the case of server classes) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the class is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window.

## Data Type

String

# OtherHeaders Property ([HadoopDFS](#hadoopdfs-class) Class)

Other headers as determined by the user (optional).

## Syntax

```text
ANSI (Cross Platform)
char* GetOtherHeaders();int SetOtherHeaders(const char* lpszOtherHeaders);

Unicode (Windows)
LPWSTR GetOtherHeaders();INT SetOtherHeaders(LPCWSTR lpszOtherHeaders);
```

## Default Value

""

## Remarks

This property can be set to a string of headers to be appended to the HTTP request headers created from other properties like ContentType and From.

The headers must follow the format *Header: Value* as described in the HTTP specifications. Header lines should be separated by CRLF (*"\r\n"*) .

Use this property with caution. If this property contains invalid headers, HTTP requests may fail.

This property is useful for extending the functionality of the class beyond what is provided.

This property is not available at design time.

## Data Type

String

# Overwrite Property ([HadoopDFS](#hadoopdfs-class) Class)

Whether to overwrite the local or remote file.

## Syntax

```text
ANSI (Cross Platform)
int GetOverwrite();int SetOverwrite(int bOverwrite);

Unicode (Windows)
BOOL GetOverwrite();INT SetOverwrite(BOOL bOverwrite);
```

## Default Value

FALSE

## Remarks

When calling [DownloadFile](#downloadfile-method-hadoopdfs-class), this property determines if [LocalFile](#localfile-property-hadoopdfs-class) should be overwritten if it already exists.

When calling [UploadFile](#uploadfile-method-hadoopdfs-class), this property determines if the remote file should be overwritten if it already exists.

## Data Type

Boolean

# ParsedHeaders Property ([HadoopDFS](#hadoopdfs-class) Class)

This property includes a collection of headers returned from the last request.

## Syntax

```text
CloudStorageList<CloudStorageHeader>* GetParsedHeaders();
```

## Remarks

This property contains a collection of headers returned from the last request. Whenever headers are returned from the server, the headers are parsed into a collection of headers. Each [Header](#header-type) in this collection contains information describing that header.

[MaxHeaders](#MaxHeaders) can be used to control the maximum number of headers saved.

This property is read-only and not available at design time.

## Data Type

[CloudStorageHeader](#header-type)

# Password Property ([HadoopDFS](#hadoopdfs-class) Class)

The password to use for authentication.

## Syntax

```text
ANSI (Cross Platform)
char* GetPassword();int SetPassword(const char* lpszPassword);

Unicode (Windows)
LPWSTR GetPassword();INT SetPassword(LPCWSTR lpszPassword);
```

## Default Value

""

## Remarks

This property specifies the password to user for authentication.

Refer to [AuthMechanism](#authmechanism-property-hadoopdfs-class) for more information.

This property is not available at design time.

## Data Type

String

# Proxy Property ([HadoopDFS](#hadoopdfs-class) Class)

A set of properties related to proxy access.

## Syntax

```text
CloudStorageProxy* GetProxy();
int SetProxy(CloudStorageProxy* val);
```

## Remarks

This property contains fields describing the proxy through which the class will attempt to connect.

## Data Type

[CloudStorageProxy](#proxy-type)

# QueryParams Property ([HadoopDFS](#hadoopdfs-class) Class)

Additional query parameters to be included in the request.

## Syntax

```text
CloudStorageList<CloudStorageQueryParam>* GetQueryParams();
int SetQueryParams(CloudStorageList<CloudStorageQueryParam>* val);
```

## Remarks

This is a collection of query parameters that will be added to the request. Parameters can be added via the [AddQueryParam](#addqueryparam-method-hadoopdfs-class) method.

## Data Type

[CloudStorageQueryParam](#queryparam-type)

# ReadBytes Property ([HadoopDFS](#hadoopdfs-class) Class)

The number of bytes to read when downloading a file.

## Syntax

```text
ANSI (Cross Platform)
int64 GetReadBytes();int SetReadBytes(int64 lReadBytes);

Unicode (Windows)
LONG64 GetReadBytes();INT SetReadBytes(LONG64 lReadBytes);
```

## Default Value

-1

## Remarks

This property specifies how many bytes should be read when [DownloadFile](#downloadfile-method-hadoopdfs-class) is called. It can be used in tandem with [StartByte](#startbyte-property-hadoopdfs-class) to specify a specific range of the file to download.

If set to -1 (default), there is no limit on how many bytes will be read.

This property is not available at design time.

## Data Type

Long64

# ResourceData Property ([HadoopDFS](#hadoopdfs-class) Class)

The data that was downloaded, or that should be uploaded.

## Syntax

```text
ANSI (Cross Platform)
int GetResourceData(char* &lpResourceData, int &lenResourceData);int SetResourceData(const char* lpResourceData, int lenResourceData);

Unicode (Windows)
INT GetResourceData(LPSTR &lpResourceData, INT &lenResourceData);INT SetResourceData(LPCSTR lpResourceData, INT lenResourceData);
```

## Default Value

""

## Remarks

This property is populated with file data after calling [DownloadFile](#downloadfile-method-hadoopdfs-class) if [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class) and [LocalFile](#localfile-property-hadoopdfs-class) are not set.

This property can also be set before calling [UploadFile](#uploadfile-method-hadoopdfs-class); its data will be uploaded if [SetUploadStream](#setuploadstream-method-hadoopdfs-class) and [LocalFile](#localfile-property-hadoopdfs-class) are not set.

This property is not available at design time.

## Data Type

Binary String

# Resources Property ([HadoopDFS](#hadoopdfs-class) Class)

A collection of resources.

## Syntax

```text
CloudStorageList<CloudStorageHDFSResource>* GetResources();
```

## Remarks

This collection holds a list of HDFS resources: files, directories, and symlinks.

Calling [GetResourceInfo](#getresourceinfo-method-hadoopdfs-class) or [ListResources](#listresources-method-hadoopdfs-class) will populate this collection.

This property is read-only and not available at design time.

## Data Type

[CloudStorageHDFSResource](#hdfsresource-type)

# SSLAcceptServerCert Property ([HadoopDFS](#hadoopdfs-class) Class)

Instructs the class to unconditionally accept the server certificate that matches the supplied certificate.

## Syntax

```text
CloudStorageCertificate* GetSSLAcceptServerCert();
int SetSSLAcceptServerCert(CloudStorageCertificate* val);
```

## Remarks

If it finds any issues with the certificate presented by the server, the class will normally terminate the connection with an error.

You may override this behavior by supplying a value for SSLAcceptServerCert. If the certificate supplied in SSLAcceptServerCert is the same as the certificate presented by the server, then the server certificate is accepted unconditionally, and the connection will continue normally.

NOTE: This functionality is provided only for cases in which you otherwise know that you are communicating with the right server. If used improperly, this property may create a security breach. Use it at your own risk.

## Data Type

[CloudStorageCertificate](#certificate-type)

# SSLCert Property ([HadoopDFS](#hadoopdfs-class) Class)

The certificate to be used during Secure Sockets Layer (SSL) negotiation.

## Syntax

```text
CloudStorageCertificate* GetSSLCert();
int SetSSLCert(CloudStorageCertificate* val);
```

## Remarks

This property includes the digital certificate that the class will use during SSL negotiation. Set this property to a valid certificate before starting SSL negotiation. To set a certificate, you may set the [Encoded](#Certificate_f_Encoded) field to the encoded certificate. To select a certificate, use the store and subject fields.

## Data Type

[CloudStorageCertificate](#certificate-type)

# SSLProvider Property ([HadoopDFS](#hadoopdfs-class) Class)

The Secure Sockets Layer/Transport Layer Security (SSL/TLS) implementation to use.

## Syntax

```text
ANSI (Cross Platform)
int GetSSLProvider();int SetSSLProvider(int iSSLProvider);

Unicode (Windows)
INT GetSSLProvider();INT SetSSLProvider(INT iSSLProvider);
```

## Possible Values

```text
SSLP_AUTOMATIC(0), SSLP_PLATFORM(1), SSLP_INTERNAL(2)
```

## Default Value

0

## Remarks

This property specifies the SSL/TLS implementation to use. In most cases the default value of *0* (Automatic) is recommended and should not be changed. When set to *0* (Automatic), the class will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used.

Possible values are as follows:

|  |  |
| --- | --- |
| 0 (sslpAutomatic - default) | Automatically selects the appropriate implementation. |
| 1 (sslpPlatform) | Uses the platform/system implementation. |
| 2 (sslpInternal) | Uses the internal implementation. |

 **Additional Notes**

In most cases using the default value (Automatic) is recommended. The class will select a provider depending on the current platform.

When Automatic is selected, on Windows, the class will use the platform implementation. On Linux/macOS, the class will use the internal implementation. When TLS 1.3 is enabled via [SSLEnabledProtocols](#SSLEnabledProtocols), the class will always try and use the platform implementation. If the platform TLS 1.3 implementation is not available, the internal implementation will be used.

## Data Type

Integer

# SSLServerCert Property ([HadoopDFS](#hadoopdfs-class) Class)

The server certificate for the last established connection.

## Syntax

```text
CloudStorageCertificate* GetSSLServerCert();
```

## Remarks

This property contains the server certificate for the last established connection.

SSLServerCert is reset every time a new connection is attempted.

This property is read-only.

## Data Type

[CloudStorageCertificate](#certificate-type)

# StartByte Property ([HadoopDFS](#hadoopdfs-class) Class)

The byte offset from which to start downloading a file.

## Syntax

```text
ANSI (Cross Platform)
int64 GetStartByte();int SetStartByte(int64 lStartByte);

Unicode (Windows)
LONG64 GetStartByte();INT SetStartByte(LONG64 lStartByte);
```

## Default Value

0

## Remarks

This property specifies an offset (in bytes) from which to start reading a file when [DownloadFile](#downloadfile-method-hadoopdfs-class) is called. It can be used in tandem with [ReadBytes](#readbytes-property-hadoopdfs-class) to specify a specific range of the file to download.

This property is not available at design time.

## Data Type

Long64

# Timeout Property ([HadoopDFS](#hadoopdfs-class) Class)

The timeout for the class.

## Syntax

```text
ANSI (Cross Platform)
int GetTimeout();int SetTimeout(int iTimeout);

Unicode (Windows)
INT GetTimeout();INT SetTimeout(INT iTimeout);
```

## Default Value

60

## Remarks

If the Timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered.

If Timeout is set to a positive value, the class will wait for the operation to complete before returning control.

The class will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive.

If Timeout expires, and the operation is not yet complete, the class fails with an error.

NOTE: By default, all timeouts are *inactivity timeouts*, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

## Data Type

Integer

# URL Property ([HadoopDFS](#hadoopdfs-class) Class)

The URL of the Hadoop WebHDFS server.

## Syntax

```text
ANSI (Cross Platform)
char* GetURL();int SetURL(const char* lpszURL);

Unicode (Windows)
LPWSTR GetURL();INT SetURL(LPCWSTR lpszURL);
```

## Default Value

""

## Remarks

This property specifies the URL of the Hadoop WebHDFS server to make requests against.

A full WebHDFS URL looks like *http[s]://<HOST>:<PORT>/webhdfs/v1*. Anytime this property is set to a non-empty string, the class will automatically append */webhdfs/v1* to its value (if necessary).

The class automatically detects whether to secure the connection using SSL/TLS based on whether the URL begins with *http* (not secured) or *https* (secured).

This property is not available at design time.

## Data Type

String

# User Property ([HadoopDFS](#hadoopdfs-class) Class)

The user name to use for authentication.

## Syntax

```text
ANSI (Cross Platform)
char* GetUser();int SetUser(const char* lpszUser);

Unicode (Windows)
LPWSTR GetUser();INT SetUser(LPCWSTR lpszUser);
```

## Default Value

""

## Remarks

This property specifies the user name to use for authentication.

Refer to [AuthMechanism](#authmechanism-property-hadoopdfs-class) for more information.

This property is not available at design time.

## Data Type

String

# AddQueryParam Method ([HadoopDFS](#hadoopdfs-class) Class)

Adds a query parameter to the QueryParams properties.

## Syntax

```text
ANSI (Cross Platform)
int AddQueryParam(const char* lpszName, const char* lpszValue);

Unicode (Windows)
INT AddQueryParam(LPCWSTR lpszName, LPCWSTR lpszValue);
```

## Remarks

This method is used to add a query parameter to the [QueryParams](#queryparams-property-hadoopdfs-class) collection. *Name* specifies the name of the parameter, and *Value* specifies the value of the parameter.

All specified *Value*s will be URL encoded by the class automatically. Consult the service documentation for details on the available parameters.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# AppendFile Method ([HadoopDFS](#hadoopdfs-class) Class)

Appends data to an existing file.

## Syntax

```text
ANSI (Cross Platform)
int AppendFile(const char* lpszFilePath);

Unicode (Windows)
INT AppendFile(LPCWSTR lpszFilePath);
```

## Remarks

This method appends data to the existing file at *FilePath*.

If [SetUploadStream](#setuploadstream-method-hadoopdfs-class) has been used to set an upload stream, it will take priority as the data source. If [LocalFile](#localfile-property-hadoopdfs-class) is set data will be read from the file at the specified path. If [LocalFile](#localfile-property-hadoopdfs-class) is not set the data in [ResourceData](#resourcedata-property-hadoopdfs-class) will be used.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Config Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets or retrieves a configuration setting.

## Syntax

```text
ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);
```

## Remarks

Config is a generic method available in every class. It is used to set and retrieve [configuration settings](#config-settings-hadoopdfs-class) for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the Config method.

To set a configuration setting named *PROPERTY*, you must call *Config("PROPERTY=VALUE")*, where *VALUE* is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a [configuration setting](#config-settings-hadoopdfs-class), you must call *Config("PROPERTY")*. The value will be returned as a string.

## Error Handling (C++)

This method returns a String value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# DeleteResource Method ([HadoopDFS](#hadoopdfs-class) Class)

Deletes a resource.

## Syntax

```text
ANSI (Cross Platform)
int DeleteResource(const char* lpszPath);

Unicode (Windows)
INT DeleteResource(LPCWSTR lpszPath);
```

## Remarks

This method deletes the resource at *Path*.

The [RecursiveDelete](#RecursiveDelete) configuration setting can be used to control whether this method will recursively delete non-empty directories (it is enabled by default).

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# DoCustomOp Method ([HadoopDFS](#hadoopdfs-class) Class)

Executes an arbitrary WebHDFS operation.

## Syntax

```text
ANSI (Cross Platform)
int DoCustomOp(const char* lpszHttpMethod, const char* lpszRequestPath, const char* lpszOp);

Unicode (Windows)
INT DoCustomOp(LPCWSTR lpszHttpMethod, LPCWSTR lpszRequestPath, LPCWSTR lpszOp);
```

## Remarks

This method can be used to execute any WebHDFS operation the class does not explicitly implement.

Valid values for *HttpMethod* are:

- *GET* (default if empty)
- *POST*
- *PUT*
- *DELETE*

*RequestPath* must either be a valid resource path, or empty string. *Op* must be a valid WebHDFS operation (refer to the Hadoop WebHDFS documentation for a full list of supported operations).

### Usage

When this method is called, the class will do the following:

1. Build a request URL using [URL](#url-property-hadoopdfs-class), *RequestPath*, *Op*, and the query parameters held by the [QueryParams](#queryparams-property-hadoopdfs-class) collection.
2. Send the request using the given *HttpMethod*, the request URL built in step 1, the headers held by [OtherHeaders](#otherheaders-property-hadoopdfs-class), and the currently-configured authentication (if any; refer to [AuthMechanism](#authmechanism-property-hadoopdfs-class) for more information). The request is always sent with an empty body.
3. Store the response headers in the [ParsedHeaders](#parsedheaders-property-hadoopdfs-class) collection, and the response body in the stream specified using [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class), the specified [LocalFile](#localfile-property-hadoopdfs-class), or [ResourceData](#resourcedata-property-hadoopdfs-class) (using the same logic as [DownloadFile](#downloadfile-method-hadoopdfs-class)).

If the response body is JSON data, the [XPath](#XPath), [XText](#XText), and other **X*** configuration settings can then be used to navigate and extract information from it.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# DownloadFile Method ([HadoopDFS](#hadoopdfs-class) Class)

Downloads a file.

## Syntax

```text
ANSI (Cross Platform)
int DownloadFile(const char* lpszFilePath);

Unicode (Windows)
INT DownloadFile(LPCWSTR lpszFilePath);
```

## Remarks

This method downloads the file at *FilePath*.

If a stream has been specified using [SetDownloadStream](#setdownloadstream-method-hadoopdfs-class), the file data will be sent through it. If a stream is not specified, and [LocalFile](#localfile-property-hadoopdfs-class) is set, the file will be saved to the specified location; otherwise, the file data will be held by [ResourceData](#resourcedata-property-hadoopdfs-class).

To download and decrypt an encrypted file, set [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) and [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class) before calling this method.

### Download Notes

In the simplest use-case, downloading a file looks like this:

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

**Resuming Downloads**

The class also supports resuming failed downloads by using the [StartByte](#startbyte-property-hadoopdfs-class) property. If a download is interrupted, set [StartByte](#startbyte-property-hadoopdfs-class) to the appropriate offset before calling this method to resume the download.

```text
string downloadFile = "../MyFile.zip";
hdfs.LocalFile = downloadFile;
hdfs.DownloadFile(hdfs.Resources[0].Path);

//The transfer is interrupted and DownloadFile() above fails. Later, resume the download:

//Get the size of the partially downloaded file
hdfs.StartByte = new FileInfo(downloadFile).Length;
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

**Resuming Encrypted File Downloads**

Resuming encrypted file downloads is only supported when [LocalFile](#localfile-property-hadoopdfs-class) was set in the initial download attempt.

If [LocalFile](#localfile-property-hadoopdfs-class) is set when beginning an encrypted download, the class creates a temporary file in [TempPath](#TempPath) to hold the encrypted data until the download is complete. If the download is interrupted, [DownloadTempFile](#DownloadTempFile) will be populated with the path of the temporary file that holds the partial data.

To resume, [DownloadTempFile](#DownloadTempFile) must be populated, along with [StartByte](#startbyte-property-hadoopdfs-class), to allow the remainder of the encrypted data to be downloaded. Once the encrypted data is downloaded it will be decrypted and written to [LocalFile](#localfile-property-hadoopdfs-class).

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.EncryptionPassword = "password";
hdfs.DownloadFile(hdfs.Resources[0].Path);

//The transfer is interrupted and DownloadFile() above fails. Later, resume the download:

//Get the size of the partially download temp file
hdfs.StartByte = new FileInfo(hdfs.Config("DownloadTempFile")).Length;
hdfs.DownloadFile(hdfs.Resources[0].Path);
```

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# GetDirSummary Method ([HadoopDFS](#hadoopdfs-class) Class)

Gets a content summary for a directory.

## Syntax

```text
ANSI (Cross Platform)
int GetDirSummary(const char* lpszDirPath);

Unicode (Windows)
INT GetDirSummary(LPCWSTR lpszDirPath);
```

## Remarks

This method gets a content summary for the directory at *DirPath*, populating the [DirSummary](#dirsummary-property-hadoopdfs-class) object property's fields.

*DirPath* may be empty to get a content summary for the root directory (*/*).

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# GetResourceInfo Method ([HadoopDFS](#hadoopdfs-class) Class)

Gets information about a specific resource.

## Syntax

```text
ANSI (Cross Platform)
int GetResourceInfo(const char* lpszPath);

Unicode (Windows)
INT GetResourceInfo(LPCWSTR lpszPath);
```

## Remarks

This method gets information about the resource at *Path*. *Path* may be empty to get information about the root directory (*/*).

Calling this method will fire the [ResourceList](#resourcelist-event-hadoopdfs-class) event, and will populate the [Resources](#resources-property-hadoopdfs-class) collection with a single item (clearing any previously-held items in the process).

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Interrupt Method ([HadoopDFS](#hadoopdfs-class) Class)

This method interrupts the current method.

## Syntax

```text
ANSI (Cross Platform)
int Interrupt();

Unicode (Windows)
INT Interrupt();
```

## Remarks

If there is no method in progress, Interrupt simply returns, doing nothing.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# JoinFileBlocks Method ([HadoopDFS](#hadoopdfs-class) Class)

Joins multiple files' blocks together into one file.

## Syntax

```text
ANSI (Cross Platform)
int JoinFileBlocks(const char* lpszTargetFilePath, const char* lpszSourceFilePaths);

Unicode (Windows)
INT JoinFileBlocks(LPCWSTR lpszTargetFilePath, LPCWSTR lpszSourceFilePaths);
```

## Remarks

This method joins the blocks from the files at one or more *SourceFilePaths* onto the end of the file at *TargetFilePath*. (If this operations is successful, the original source files will no longer be accessible.)

The order of the source files' paths in *SourceFilePaths* determines the order in which their blocks are joined onto the file at *TargetFilePath*.

### Usage Constraints

The server imposes a number of constraints that must be satisfied in order for the join operation to complete successfully.

*TargetFilePath* and *SourceFilePaths* must both be non-empty.

*SourceFilePaths* must be specified as a comma-separated list of source file paths, with no duplicates or paths that match *TargetFilePath*.

Additionally, all files referred to by both *TargetFilePath* and *SourceFilePaths* must satisfy the following constraints:

- All files must already exist.
- All files must be located in the exact same directory (i.e., all files must be siblings).
- The block size of all source files must be less than or equal to the block size of the target file.

If any of the above constraints are not satisfied, the server will return an error.

The class will take care of verifying that all parameters are non-empty and that all paths begin with a forward slash (*/*).

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# ListResources Method ([HadoopDFS](#hadoopdfs-class) Class)

Lists resources in a given directory.

## Syntax

```text
ANSI (Cross Platform)
int ListResources(const char* lpszDirPath);

Unicode (Windows)
INT ListResources(LPCWSTR lpszDirPath);
```

## Remarks

This method lists resources within the directory at *DirPath*.

Calling this method will fire the [ResourceList](#resourcelist-event-hadoopdfs-class) event once for each resource, and will also populate the [Resources](#resources-property-hadoopdfs-class) collection.

*DirPath* may be empty to list resources in the root directory (*/*).

```text
// ResourceList event handler.
hdfs.OnResourceList += (s, e) => {
  Console.WriteLine(e.Name);
};

hdfs.ListResources("/work_files/serious_business/cats");

for (int i = 0; i < hdfs.Resources.Count; i++) {
  // Process resources here.
}
```

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# MakeDirectory Method ([HadoopDFS](#hadoopdfs-class) Class)

Makes a directory.

## Syntax

```text
ANSI (Cross Platform)
char* MakeDirectory(const char* lpszNewDirPath);

Unicode (Windows)
LPWSTR MakeDirectory(LPCWSTR lpszNewDirPath);
```

## Remarks

This method makes a new directory at *NewDirPath* and returns the full path of the new directory. Any non-existent parent directories will also be created.

If the [CreatePermission](#CreatePermission) configuration setting is non-empty, the directory will be created with the permission it specifies. Otherwise, the server's default (*755*) will be used.

## Error Handling (C++)

This method returns a String value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# MoveResource Method ([HadoopDFS](#hadoopdfs-class) Class)

Moves a resource.

## Syntax

```text
ANSI (Cross Platform)
int MoveResource(const char* lpszFromPath, const char* lpszToPath);

Unicode (Windows)
INT MoveResource(LPCWSTR lpszFromPath, LPCWSTR lpszToPath);
```

## Remarks

This method moves the resource at *FromPath* to *ToPath*.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Reset Method ([HadoopDFS](#hadoopdfs-class) Class)

Resets the class to its initial state.

## Syntax

```text
ANSI (Cross Platform)
int Reset();

Unicode (Windows)
INT Reset();
```

## Remarks

This method resets the class to its initial state.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetDownloadStream Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets the stream to which downloaded data will be written.

## Syntax

```text
ANSI (Cross Platform)
int SetDownloadStream(CloudStorageStream* sDownloadStream);

Unicode (Windows)
INT SetDownloadStream(CloudStorageStream* sDownloadStream);
```

## Remarks

If a download stream is set before data is downloaded, the downloaded data will be written to the stream. The stream should be open and normally set to position 0.

Note: Passing a non-null value for *DownloadStream* will cause [LocalFile](#localfile-property-hadoopdfs-class) to be cleared. Similarly, setting [LocalFile](#localfile-property-hadoopdfs-class) to a non-empty value will discard any stream set using this method.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetFileReplication Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets the replication factor for a file.

## Syntax

```text
ANSI (Cross Platform)
int SetFileReplication(const char* lpszFilePath, int iReplication);

Unicode (Windows)
INT SetFileReplication(LPCWSTR lpszFilePath, INT iReplication);
```

## Remarks

This method sets the replication factor for the file at *FilePath* to *Replication*.

Valid values for *Replication* are 1 through 32767 (inclusive); or 0 to reset the file's replication factor back to the server default.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetOwner Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets a resource's owner and/or group.

## Syntax

```text
ANSI (Cross Platform)
int SetOwner(const char* lpszPath, const char* lpszOwner, const char* lpszGroup);

Unicode (Windows)
INT SetOwner(LPCWSTR lpszPath, LPCWSTR lpszOwner, LPCWSTR lpszGroup);
```

## Remarks

This method set the owner and/or group of the resource at *Path* to the given values.

If non-empty, *Owner* must be a valid user name, and *Group* must be a valid group name. If either parameter is empty, the file's current value will remain unchanged. (If both parameters are empty, no request is sent.)

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetPermission Method ([HadoopDFS](#hadoopdfs-class) Class)

Assigns the given permission to a resource.

## Syntax

```text
ANSI (Cross Platform)
int SetPermission(const char* lpszPath, const char* lpszPermission);

Unicode (Windows)
INT SetPermission(LPCWSTR lpszPath, LPCWSTR lpszPermission);
```

## Remarks

This method assigns the given *Permission* to the resource at *Path*.

*Permission* must be formatted as an octal permission string. If *Permission* is empty string, the resource's permission will be reset to the server default (*755*).

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetTimes Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets a resource's modification and/or access times.

## Syntax

```text
ANSI (Cross Platform)
int SetTimes(const char* lpszPath, int64 lModifiedTime, int64 lAccessTime);

Unicode (Windows)
INT SetTimes(LPCWSTR lpszPath, LONG64 lModifiedTime, LONG64 lAccessTime);
```

## Remarks

This method sets the modification and/or access times of the resource at *Path* to the given values.

Both *ModifiedTime* and *AccessTime* should be specified as a number of milliseconds relative to the Unix epoch. If either parameter is negative, the file's current value will remain unchanged. (If both parameters are negative, no request is sent.)

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SetUploadStream Method ([HadoopDFS](#hadoopdfs-class) Class)

Sets the stream from which data is read when uploading.

## Syntax

```text
ANSI (Cross Platform)
int SetUploadStream(CloudStorageStream* sUploadStream);

Unicode (Windows)
INT SetUploadStream(CloudStorageStream* sUploadStream);
```

## Remarks

If an upload stream is set before data is uploaded, the content of the stream will be read by the class and uploaded to the server. The stream should be open and normally set to position 0.

Note: Passing a non-null value for *UploadStream* will cause [LocalFile](#localfile-property-hadoopdfs-class) to be cleared. Similarly, setting [LocalFile](#localfile-property-hadoopdfs-class) to a non-empty value will discard any stream set using this method.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# TruncateFile Method ([HadoopDFS](#hadoopdfs-class) Class)

Truncates a file to a given size.

## Syntax

```text
ANSI (Cross Platform)
bool TruncateFile(const char* lpszFilePath, int64 lNewSize);

Unicode (Windows)
bool TruncateFile(LPCWSTR lpszFilePath, LONG64 lNewSize);
```

## Remarks

This method truncates the file at *FilePath* to the given *NewSize* (specified in bytes). *NewSize* must not be less than 0 or greater than the file's current size.

This method returns *true* if the file has been truncated successfully and is immediately ready for further modifications.

This method returns *false* if the server is still in the process of truncating the file (this could happen, e.g., if the server needs to truncate multiple replicas of the file). In this case, the server will reject any further attempts to modify the file until it has finished truncating it. Monitor the file's size using [GetResourceInfo](#getresourceinfo-method-hadoopdfs-class) to determine when the truncation process has finished.

## Error Handling (C++)

This method returns a Boolean value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# UploadFile Method ([HadoopDFS](#hadoopdfs-class) Class)

Uploads a file.

## Syntax

```text
ANSI (Cross Platform)
char* UploadFile(const char* lpszNewFilePath);

Unicode (Windows)
LPWSTR UploadFile(LPCWSTR lpszNewFilePath);
```

## Remarks

This method uploads a new file to *NewFilePath* and returns the full path of the uploaded file. If a file already exists on the server at *NewFilePath*, the [Overwrite](#overwrite-property-hadoopdfs-class) property controls whether the server will overwrite the file or return an error.

If the [CreatePermission](#CreatePermission) configuration setting is non-empty, the file will be created with the permission it specifies. Otherwise, the server's default (*755*) will be used.

If [SetUploadStream](#setuploadstream-method-hadoopdfs-class) has been used to set an upload stream, it will take priority as the file data source. If [LocalFile](#localfile-property-hadoopdfs-class) is set the file will be uploaded from the specified path. If [LocalFile](#localfile-property-hadoopdfs-class) is not set the data in [ResourceData](#resourcedata-property-hadoopdfs-class) will be used.

To encrypt the file before uploading it, set [EncryptionAlgorithm](#encryptionalgorithm-property-hadoopdfs-class) and [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class).

```text
hdfs.LocalFile = "../MyFile.zip";
hdfs.UploadFile("/MyFile.zip");
```

## Error Handling (C++)

This method returns a String value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# EndTransfer Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired when a document finishes transferring.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireEndTransfer(HadoopDFSEndTransferEventParams *e);
typedef struct {  int Direction;
  int reserved;
} HadoopDFSEndTransferEventParams;

Unicode (Windows)
virtual INT FireEndTransfer(HadoopDFSEndTransferEventParams *e);
typedef struct {  INT Direction;
  INT reserved;
} HadoopDFSEndTransferEventParams;
```

## Remarks

This event is fired first when the client finishes sending data to the server (in a *POST* or *PUT* request) and then when the document text finishes transferring from the server to the local host.

The *Direction* parameter shows whether the client (0) or the server (1) is sending the data.

# Error Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired when information is available about errors during data delivery.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireError(HadoopDFSErrorEventParams *e);
typedef struct {  int ErrorCode;  const char *Description;
  int reserved;
} HadoopDFSErrorEventParams;

Unicode (Windows)
virtual INT FireError(HadoopDFSErrorEventParams *e);
typedef struct {  INT ErrorCode;  LPCWSTR Description;
  INT reserved;
} HadoopDFSErrorEventParams;
```

## Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class fails with an error.

The *ErrorCode* parameter contains an error code, and the *Description* parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the [Error Codes](#trappable-errors-hadoopdfs-class) section.

# Header Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired every time a header line comes in.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireHeader(HadoopDFSHeaderEventParams *e);
typedef struct {  const char *Field;  const char *Value;
  int reserved;
} HadoopDFSHeaderEventParams;

Unicode (Windows)
virtual INT FireHeader(HadoopDFSHeaderEventParams *e);
typedef struct {  LPCWSTR Field;  LPCWSTR Value;
  INT reserved;
} HadoopDFSHeaderEventParams;
```

## Remarks

The *Field* parameter contains the name of the HTTP header (which is the same as it is delivered). The *Value* parameter contains the header contents.

If the header line being retrieved is a continuation header line, then the *Field* parameter contains "" (empty string).

# Log Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired once for each log message.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireLog(HadoopDFSLogEventParams *e);
typedef struct {  int LogLevel;  const char *Message;  const char *LogType;
  int reserved;
} HadoopDFSLogEventParams;

Unicode (Windows)
virtual INT FireLog(HadoopDFSLogEventParams *e);
typedef struct {  INT LogLevel;  LPCWSTR Message;  LPCWSTR LogType;
  INT reserved;
} HadoopDFSLogEventParams;
```

## Remarks

This event is fired once for each log message generated by the class. The verbosity is controlled by the [LogLevel](#LogLevel) setting.

*LogLevel* indicates the level of message. Possible values are as follows:

|  |  |
| --- | --- |
| 0 (None) | No events are logged. |
| 1 (Info - default) | Informational events are logged. |
| 2 (Verbose) | Detailed data are logged. |
| 3 (Debug) | Debug data are logged. |

The value 1 (Info) logs basic information, including the URL, HTTP version, and status details.

The value 2 (Verbose) logs additional information about the request and response.

The value 3 (Debug) logs the headers and body for both the request and response, as well as additional debug information (if any).

*Message* is the log entry.

*LogType* identifies the type of log entry. Possible values are as follows:

- "Info"
- "RequestHeaders"
- "ResponseHeaders"
- "RequestBody"
- "ResponseBody"
- "ProxyRequest"
- "ProxyResponse"
- "FirewallRequest"
- "FirewallResponse"

# Progress Event ([HadoopDFS](#hadoopdfs-class) Class)

Fires during an upload or download to indicate transfer progress.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireProgress(HadoopDFSProgressEventParams *e);
typedef struct {  int Direction;  int64 BytesTransferred;  int64 TotalBytes;  int PercentDone;
  int reserved;
} HadoopDFSProgressEventParams;

Unicode (Windows)
virtual INT FireProgress(HadoopDFSProgressEventParams *e);
typedef struct {  INT Direction;  LONG64 BytesTransferred;  LONG64 TotalBytes;  INT PercentDone;
  INT reserved;
} HadoopDFSProgressEventParams;
```

## Remarks

This event fires during an upload or download to indicate the progress of the transfer of the entire request. By default, this event will fire each time *PercentDone* increases by one percent; the [ProgressStep](#ProgressStep) configuration setting can be used to alter this behavior.

*Direction* indicates whether the transfer is an upload (*0*) or a download (*1*).

*BytesTransferred* reflects the number of bytes that have been transferred so far, or *0* if the transfer is starting (however, see note below).

*TotalBytes* reflects the total number of bytes that are to be transferred, or *-1* if the total is unknown. This amount includes the size of everything in the request like HTTP headers.

*PercentDone* reflects the overall progress of the transfer, or *-1* if the progress cannot be calculated.

NOTE: By default, the class tracks transfer progress *absolutely*. If a transfer is interrupted and later resumed, the values reported by this event upon and after resumption will account for the data that was transferred *before* the interruption.

For example, if 10MB of data was successfully transferred before the interruption, then this event will fire with a *BytesTransferred* value of *10485760* (10MB) when the transfer is first resumed, and then continue to fire with successively greater values as usual.

This behavior can be changed by disabling the [ProgressAbsolute](#ProgressAbsolute) configuration setting, in which case the class will treat resumed transfers as "new" transfers. In this case, the *BytesTransferred* parameter will always be *0* the first time this event fires, regardless of whether the transfer is new or being resumed.

# ResourceList Event ([HadoopDFS](#hadoopdfs-class) Class)

Fires once for each resource returned when listing resources.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireResourceList(HadoopDFSResourceListEventParams *e);
typedef struct {  const char *Name;  const char *Path;  int ResourceType;  int64 ModifiedTime;  int64 AccessTime;  int64 Size;  const char *Permission;  const char *Owner;  const char *Group;  int Replication;
  int reserved;
} HadoopDFSResourceListEventParams;

Unicode (Windows)
virtual INT FireResourceList(HadoopDFSResourceListEventParams *e);
typedef struct {  LPCWSTR Name;  LPCWSTR Path;  INT ResourceType;  LONG64 ModifiedTime;  LONG64 AccessTime;  LONG64 Size;  LPCWSTR Permission;  LPCWSTR Owner;  LPCWSTR Group;  INT Replication;
  INT reserved;
} HadoopDFSResourceListEventParams;
```

## Remarks

This event fires once for each resource returned when [ListResources](#listresources-method-hadoopdfs-class) or [GetResourceInfo](#getresourceinfo-method-hadoopdfs-class) is called.

*Name* is the name of the resource.

*Path* is the full path of the resource.

*ResourceType* reflects the resource's type. Possible values are:

|  |  |
| --- | --- |
| 0 (hrtFile) | A file. |
| 1 (hrtDirectory) | A directory. |
| 2 (hrtSymLink) | A symlink. |

*ModifiedTime* and *AccessTime* reflect the resource's last modified and last access times, in milliseconds relative to the Unix epoch.

*Size* reflects the size of the file, in bytes. Always 0 for directories.

*Permission* reflects the resource's permission bits, represented as an octal string (e.g., *755*).

*Owner* is the name of the resource's owner.

*Group* is the name of the resource's group.

*Replication* reflects the file's replication factor. Always 0 for directories.

# SSLServerAuthentication Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired after the server presents its certificate to the client.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSSLServerAuthentication(HadoopDFSSSLServerAuthenticationEventParams *e);
typedef struct {  const char *CertEncoded;
  int lenCertEncoded;  const char *CertSubject;  const char *CertIssuer;  const char *Status;  int Accept;
  int reserved;
} HadoopDFSSSLServerAuthenticationEventParams;

Unicode (Windows)
virtual INT FireSSLServerAuthentication(HadoopDFSSSLServerAuthenticationEventParams *e);
typedef struct {  LPCSTR CertEncoded;
  INT lenCertEncoded;  LPCWSTR CertSubject;  LPCWSTR CertIssuer;  LPCWSTR Status;  BOOL Accept;
  INT reserved;
} HadoopDFSSSLServerAuthenticationEventParams;
```

## Remarks

During this event, the client can decide whether or not to continue with the connection process. The *Accept* parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

 When *Accept* is False, *Status* shows why the verification failed (otherwise, *Status* contains the string *OK*). If it is decided to continue, you can override and accept the certificate by setting the *Accept* parameter to True.

# SSLStatus Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired when secure connection progress messages are available.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSSLStatus(HadoopDFSSSLStatusEventParams *e);
typedef struct {  const char *Message;
  int reserved;
} HadoopDFSSSLStatusEventParams;

Unicode (Windows)
virtual INT FireSSLStatus(HadoopDFSSSLStatusEventParams *e);
typedef struct {  LPCWSTR Message;
  INT reserved;
} HadoopDFSSSLStatusEventParams;
```

## Remarks

The event is fired for informational and logging purposes only. This event tracks the progress of the connection.

# StartTransfer Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired when a document starts transferring (after the headers).

## Syntax

```text
ANSI (Cross Platform)
virtual int FireStartTransfer(HadoopDFSStartTransferEventParams *e);
typedef struct {  int Direction;
  int reserved;
} HadoopDFSStartTransferEventParams;

Unicode (Windows)
virtual INT FireStartTransfer(HadoopDFSStartTransferEventParams *e);
typedef struct {  INT Direction;
  INT reserved;
} HadoopDFSStartTransferEventParams;
```

## Remarks

This event is fired first when the client starts sending data to the server (in a *POST* or *PUT* request) and then when the document text starts transferring from the server to the local host.

The *Direction* parameter shows whether the client (0) or the server (1) is sending the data.

# Transfer Event ([HadoopDFS](#hadoopdfs-class) Class)

Fired while a document transfers (delivers document).

## Syntax

```text
ANSI (Cross Platform)
virtual int FireTransfer(HadoopDFSTransferEventParams *e);
typedef struct {  int Direction;  int64 BytesTransferred;  int PercentDone;  const char *Text;
  int lenText;
  int reserved;
} HadoopDFSTransferEventParams;

Unicode (Windows)
virtual INT FireTransfer(HadoopDFSTransferEventParams *e);
typedef struct {  INT Direction;  LONG64 BytesTransferred;  INT PercentDone;  LPCSTR Text;
  INT lenText;
  INT reserved;
} HadoopDFSTransferEventParams;
```

## Remarks

The *Text* parameter contains the portion of the document text being received. It is empty if data are being posted to the server.

The *BytesTransferred* parameter contains the number of bytes transferred in this *Direction* since the beginning of the document text (excluding HTTP response headers).

The *Direction* parameter shows whether the client (0) or the server (1) is sending the data.

The *PercentDone* parameter shows the progress of the transfer in the corresponding direction. If *PercentDone* can not be calculated the value will be -1.

NOTE: Events are not re-entrant. Performing time-consuming operations within this event will prevent it from firing again in a timely manner and may affect overall performance.

# Certificate Type

This is the digital certificate being used.

## Syntax

 *CloudStorageCertificate* (declared in *cloudstorage.h*)

## Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

The following fields are available:

- [EffectiveDate](#Certificate_f_EffectiveDate)

- [ExpirationDate](#Certificate_f_ExpirationDate)

- [ExtendedKeyUsage](#Certificate_f_ExtendedKeyUsage)

- [Fingerprint](#Certificate_f_Fingerprint)

- [FingerprintSHA1](#Certificate_f_FingerprintSHA1)

- [FingerprintSHA256](#Certificate_f_FingerprintSHA256)

- [Issuer](#Certificate_f_Issuer)

- [PrivateKey](#Certificate_f_PrivateKey)

- [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable)

- [PrivateKeyContainer](#Certificate_f_PrivateKeyContainer)

- [PublicKey](#Certificate_f_PublicKey)

- [PublicKeyAlgorithm](#Certificate_f_PublicKeyAlgorithm)

- [PublicKeyLength](#Certificate_f_PublicKeyLength)

- [SerialNumber](#Certificate_f_SerialNumber)

- [SignatureAlgorithm](#Certificate_f_SignatureAlgorithm)

- [Store](#Certificate_f_Store)

- [StorePassword](#Certificate_f_StorePassword)

- [StoreType](#Certificate_f_StoreType)

- [SubjectAltNames](#Certificate_f_SubjectAltNames)

- [ThumbprintMD5](#Certificate_f_ThumbprintMD5)

- [ThumbprintSHA1](#Certificate_f_ThumbprintSHA1)

- [ThumbprintSHA256](#Certificate_f_ThumbprintSHA256)

- [Usage](#Certificate_f_Usage)

- [UsageFlags](#Certificate_f_UsageFlags)

- [Version](#Certificate_f_Version)

- [Subject](#Certificate_f_Subject)

- [Encoded](#Certificate_f_Encoded)

## Fields

 **EffectiveDate** *char* (read-only)*
*Default Value: ""*

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

 **ExpirationDate** *char* (read-only)*
*Default Value: ""*

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

 **ExtendedKeyUsage** *char* (read-only)*
*Default Value: ""*

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

 **Fingerprint** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02*

 **FingerprintSHA1** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84*

 **FingerprintSHA256** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53*

 **Issuer** *char* (read-only)*
*Default Value: ""*

The issuer of the certificate. This field contains a string representation of the name of the issuing authority for the certificate.

 **PrivateKey** *char* (read-only)*
*Default Value: ""*

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

NOTE: The [PrivateKey](#Certificate_f_PrivateKey) may be available but not exportable. In this case, [PrivateKey](#Certificate_f_PrivateKey) returns an empty string.

 **PrivateKeyAvailable** *int (read-only)*
*Default Value: FALSE*

Whether a [PrivateKey](#Certificate_f_PrivateKey) is available for the selected certificate. If [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable) is True, the certificate may be used for authentication purposes (e.g., server authentication).

 **PrivateKeyContainer** *char* (read-only)*
*Default Value: ""*

The name of the [PrivateKey](#Certificate_f_PrivateKey) container for the certificate (if available). This functionality is available only on Windows platforms.

 **PublicKey** *char* (read-only)*
*Default Value: ""*

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

 **PublicKeyAlgorithm** *char* (read-only)*
*Default Value: ""*

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm.

 **PublicKeyLength** *int (read-only)*
*Default Value: 0*

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

 **SerialNumber** *char* (read-only)*
*Default Value: ""*

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

 **SignatureAlgorithm** *char* (read-only)*
*Default Value: ""*

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm.

 **Store** *char**
*Default Value: "MY"*

The name of the certificate store for the client certificate.

The [StoreType](#Certificate_f_StoreType) field denotes the type of the certificate store specified by [Store](#Certificate_f_Store). If the store is password-protected, specify the password in [StorePassword](#Certificate_f_StorePassword).

[Store](#Certificate_f_Store) is used in conjunction with the [Subject](#Certificate_f_Subject) field to specify client certificates. If [Store](#Certificate_f_Store) has a value, and [Subject](#Certificate_f_Subject) or [Encoded](#Certificate_f_Encoded) is set, a search for a certificate is initiated. Please see the [Subject](#Certificate_f_Subject) field for details.

 Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

|  |  |
| --- | --- |
| MY | A certificate store holding personal certificates with their associated private keys. |
| CA | Certifying authority certificates. |
| ROOT | Root certificates. |

When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

 **StorePassword** *char**
*Default Value: ""*

If the type of certificate store requires a password, this field is used to specify the password needed to open the certificate store.

 **StoreType** *int*
*Default Value: 0*

The type of certificate store for this certificate.

 The class supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the class will automatically determine the type. This field can take one of the following values:

```csharp
sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11,
                               @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll",
                               "123456", // PIN
                               "CN=cert_subject");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

```csharp
certmgr.CertStoreType = CertStoreTypes.cstPKCS11;
certmgr.OnCertList += (s, e) => {
  secKeyBlob = e.CertEncoded;
};
certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll";
certmgr.CertStorePassword = "123456"; // PIN
certmgr.ListStoreCertificates();

sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

|  |  |
| --- | --- |
| 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. |
| 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. |
| 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. |
| 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. |
| 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. |
| 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. |
| 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. |
| 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. |
| 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. |
| 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. |
| 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. |
| 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. |
| 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. |
| 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. |
| 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). |
| 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). |
| 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. |
| 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. |
| 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). |
| 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). |
| 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. |
| 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. |
| 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#certificate-type) object and pass cstPKCS11 as the [StoreType](#Certificate_f_StoreType), the full path of the PKCS#11 DLL as the [Store](#Certificate_f_Store), and the PIN as the [StorePassword](#Certificate_f_StorePassword). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the CertMgr class by calling the ListStoreCertificates method after setting the corresponding properties accordingly. The certificate information returned in the CertList event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [Store](#Certificate_f_Store) and set [StorePassword](#Certificate_f_StorePassword) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): |
| 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. |

 **SubjectAltNames** *char* (read-only)*
*Default Value: ""*

Comma-separated lists of alternative subject names for the certificate.

 **ThumbprintMD5** *char* (read-only)*
*Default Value: ""*

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA1** *char* (read-only)*
*Default Value: ""*

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA256** *char* (read-only)*
*Default Value: ""*

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **Usage** *char* (read-only)*
*Default Value: ""*

The text description of [UsageFlags](#Certificate_f_UsageFlags).

This value will be one or more of the following strings and will be separated by commas:

- Digital Signature
- Non-Repudiation
- Key Encipherment
- Data Encipherment
- Key Agreement
- Certificate Signing
- CRL Signing
- Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

 **UsageFlags** *int (read-only)*
*Default Value: 0*

The flags that show intended use for the certificate. The value of [UsageFlags](#Certificate_f_UsageFlags) is a combination of the following flags:

|  |  |
| --- | --- |
| 0x80 | Digital Signature |
| 0x40 | Non-Repudiation |
| 0x20 | Key Encipherment |
| 0x10 | Data Encipherment |
| 0x08 | Key Agreement |
| 0x04 | Certificate Signing |
| 0x02 | CRL Signing |
| 0x01 | Encipher Only |

Please see the [Usage](#Certificate_f_Usage) field for a text representation of [UsageFlags](#Certificate_f_UsageFlags).

This functionality currently is not available when the provider is OpenSSL.

 **Version** *char* (read-only)*
*Default Value: ""*

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

 **Subject** *char**
*Default Value: ""*

The subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the field is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows:

| Field | Meaning |
| --- | --- |
| CN | Common Name. This is commonly a hostname like www.server.com. |
| O | Organization |
| OU | Organizational Unit |
| L | Locality |
| S | State |
| C | Country |
| E | Email Address |

If a field value contains a comma, it must be quoted.

 **Encoded** *char**
*Default Value: ""*

The certificate (PEM/Base64 encoded). This field is used to assign a specific certificate. The [Store](#Certificate_f_Store) and [Subject](#Certificate_f_Subject) fields also may be used to specify a certificate.

When [Encoded](#Certificate_f_Encoded) is set, a search is initiated in the current [Store](#Certificate_f_Store) for the private key of the certificate. If the key is found, [Subject](#Certificate_f_Subject) is updated to reflect the full subject of the selected certificate; otherwise, [Subject](#Certificate_f_Subject) is set to an empty string.

## Constructors

```text
Certificate()
```

 Creates a instance whose properties can be set.

```text
Certificate(const char* lpEncoded, int lenEncoded)
```

 Parses * Encoded * as an X.509 public key.

```text
Certificate(int iStoreType, const char* lpStore, int lenStore, const char* lpszStorePassword, const char* lpszSubject)
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a byte array containing the certificate data. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the component will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

# Firewall Type

The firewall the component will connect through.

## Syntax

 *CloudStorageFirewall* (declared in *cloudstorage.h*)

## Remarks

When connecting through a firewall, this type is used to specify different properties of the firewall, such as the firewall [Host](#Firewall_f_Host) and the [FirewallType](#Firewall_f_FirewallType).

The following fields are available:

- [AutoDetect](#Firewall_f_AutoDetect)

- [FirewallType](#Firewall_f_FirewallType)

- [Host](#Firewall_f_Host)

- [Password](#Firewall_f_Password)

- [Port](#Firewall_f_Port)

- [User](#Firewall_f_User)

## Fields

 **AutoDetect** *int*
*Default Value: FALSE*

Whether to automatically detect and use firewall system settings, if available.

 **FirewallType** *int*
*Default Value: 0*

The type of firewall to connect through. The applicable values are as follows:

|  |  |
| --- | --- |
| fwNone (0) | No firewall (default setting). |
| fwTunnel (1) | Connect through a tunneling proxy. [Port](#Firewall_f_Port) is set to 80. |
| fwSOCKS4 (2) | Connect through a SOCKS4 Proxy. [Port](#Firewall_f_Port) is set to 1080. |
| fwSOCKS5 (3) | Connect through a SOCKS5 Proxy. [Port](#Firewall_f_Port) is set to 1080. |
| fwSOCKS4A (10) | Connect through a SOCKS4A Proxy. [Port](#Firewall_f_Port) is set to 1080. |

 **Host** *char**
*Default Value: ""*

The name or IP address of the firewall (optional). If a [Host](#Firewall_f_Host) is given, the requested connections will be authenticated through the specified firewall when connecting.

If this field is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, this field is set to the corresponding address. If the search is not successful, the class fails with an error.

 **Password** *char**
*Default Value: ""*

A password if authentication is to be used when connecting through the firewall. If [Host](#Firewall_f_Host) is specified, the [User](#Firewall_f_User) and [Password](#Firewall_f_Password) fields are used to connect and authenticate to the given firewall. If the authentication fails, the class fails with an error.

 **Port** *int*
*Default Value: 0*

The Transmission Control Protocol (TCP) port for the firewall [Host](#Firewall_f_Host). See the description of the [Host](#Firewall_f_Host) field for details.

NOTE: This field is set automatically when [FirewallType](#Firewall_f_FirewallType) is set to a valid value. See the description of the [FirewallType](#Firewall_f_FirewallType) field for details.

 **User** *char**
*Default Value: ""*

A username if authentication is to be used when connecting through a firewall. If [Host](#Firewall_f_Host) is specified, this field and the [Password](#Firewall_f_Password) field are used to connect and authenticate to the given [Firewall](#firewall-type). If the authentication fails, the class fails with an error.

## Constructors

```text
Firewall()
```

# HDFSDirSummary Type

HDFS directory content summary information.

## Syntax

 *CloudStorageHDFSDirSummary* (declared in *cloudstorage.h*)

## Remarks

This type holds and HDFS directory's content summary information.

The following fields are available:

- [DirCount](#HDFSDirSummary_f_DirCount)

- [FileCount](#HDFSDirSummary_f_FileCount)

- [NameQuota](#HDFSDirSummary_f_NameQuota)

- [Size](#HDFSDirSummary_f_Size)

- [SpaceQuota](#HDFSDirSummary_f_SpaceQuota)

- [SpaceUsed](#HDFSDirSummary_f_SpaceUsed)

- [StorageQuota](#HDFSDirSummary_f_StorageQuota)

- [StorageQuotaCount](#HDFSDirSummary_f_StorageQuotaCount)

- [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex)

- [StorageQuotaType](#HDFSDirSummary_f_StorageQuotaType)

- [StorageQuotaUsed](#HDFSDirSummary_f_StorageQuotaUsed)

## Fields

 **DirCount** *int64 (read-only)*
*Default Value: 0*

The number of subdirectories within the directory.

This field reflects the number of subdirectories contained within the directory, calculated recursively. Note that this count will always include the directory itself; i.e., this field would return 1 for a directory with no subfolders.

 **FileCount** *int64 (read-only)*
*Default Value: 0*

The number of files within the directory.

This field reflects the number of files contained within the directory, calculated recursively.

 **NameQuota** *int64 (read-only)*
*Default Value: -1*

The name quota imposed on the directory.

This field reflects the name quota imposed on the directory, or -1 if the directory doesn't have a name quota set.

A name quota limits the number of files and directories that can be created within a directory (calculated recursively). Note that a directory's own name is counted against its own quota, so the minimum name quota that may be applied to a directory is 1 (which will force the directory to stay empty).

 **Size** *int64 (read-only)*
*Default Value: 0*

The total size of the directory contents, excluding file replicas.

This field reflects the total size (in bytes) of the directory's contents, calculated recursively.

Unlike [SpaceUsed](#HDFSDirSummary_f_SpaceUsed), this field's value *does not* take file replicas into account, and thus should not be interpreted as the actual number of bytes the directory's contents use on disk.

 **SpaceQuota** *int64 (read-only)*
*Default Value: -1*

The space quota imposed on the directory.

This field reflects the overall space quota (in bytes) imposed on the directory, or -1 if the directory doesn't have a space quota set.

A space quota limits the total number of bytes the files within a directory (or any of its subdirectories) may consume across all storage mediums. Space quotas are tracked separately from each directory's various [StorageQuota](#HDFSDirSummary_f_StorageQuota)s, and only one space quota may be applied to any given directory.

 **SpaceUsed** *int64 (read-only)*
*Default Value: 0*

The total amount of space the directory consumes on disk.

This field reflects the total amount of space (in bytes) that the directory's contents, calculated recursively, consume on disk.

Unlike [Size](#HDFSDirSummary_f_Size), this field's value includes space consumed by file replicas.

 **StorageQuota** *int64 (read-only)*
*Default Value: -1*

The storage type quota imposed on the directory.

This field reflects the storage type quota (in bytes) imposed on the directory for the [StorageQuotaType](#HDFSDirSummary_f_StorageQuotaType) currently selected by [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex).

Storage type quotas limit the number of bytes that files within a directory (or any of its subdirectories) may consume on specific types of storage mediums. Multiple storage type quotas, each associated with a different type of storage medium, may be imposed on a directory simultaneously. Storage type quotas are tracked separately from a directory's overall [SpaceQuota](#HDFSDirSummary_f_SpaceQuota).

Use [StorageQuotaCount](#HDFSDirSummary_f_StorageQuotaCount) to determine how many storage type quotas are imposed on a directory, and [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex) to select which storage type quota's information to reflect in the [StorageQuota](#HDFSDirSummary_f_StorageQuota), [StorageQuotaType](#HDFSDirSummary_f_StorageQuotaType), and [StorageQuotaUsed](#HDFSDirSummary_f_StorageQuotaUsed) fields.

Note that it is possible for a storage type quota to be imposed on a directory without *actually* restricting any space usage, in which case this field's value will be -1.

 **StorageQuotaCount** *int (read-only)*
*Default Value: 0*

The number of storage type quotas associated with the directory.

This field reflects the number of storage type quotas associated with the directory. Use the [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex) field to select which storage type quota's information to reflect in the [StorageQuota](#HDFSDirSummary_f_StorageQuota), [StorageQuotaType](#HDFSDirSummary_f_StorageQuotaType), and [StorageQuotaUsed](#HDFSDirSummary_f_StorageQuotaUsed) fields.

 **StorageQuotaIndex** *int*
*Default Value: -1*

Selects the storage type quota to show information for.

This field selects which storage type quota's information to reflect in the [StorageQuota](#HDFSDirSummary_f_StorageQuota), [StorageQuotaType](#HDFSDirSummary_f_StorageQuotaType), and [StorageQuotaUsed](#HDFSDirSummary_f_StorageQuotaUsed) fields; those fields are re-populated when this field's value is changed.

Valid values for this field are -1 to ([StorageQuotaCount](#HDFSDirSummary_f_StorageQuotaCount) - 1); invalid indices are ignored. The default value is 0 if [StorageQuotaCount](#HDFSDirSummary_f_StorageQuotaCount) is greater than 0, and -1 otherwise.

 **StorageQuotaType** *char* (read-only)*
*Default Value: ""*

The storage type associated with the storage type quota.

This field reflects the storage type associated with the storage type quota currently selected by [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex)

 **StorageQuotaUsed** *int64 (read-only)*
*Default Value: 0*

The number of bytes consumed for the storage type quota.

This field reflects the number of bytes that have been consumed for the storage type quota currently selected by [StorageQuotaIndex](#HDFSDirSummary_f_StorageQuotaIndex)

## Constructors

```text
HDFSDirSummary()
```

# HDFSResource Type

An HDFS file, directory, or symlink.

## Syntax

 *CloudStorageHDFSResource* (declared in *cloudstorage.h*)

## Remarks

This type represents and HDFS file, directory, or symlink.

The following fields are available:

- [AccessTime](#HDFSResource_f_AccessTime)

- [BlockSize](#HDFSResource_f_BlockSize)

- [ChildCount](#HDFSResource_f_ChildCount)

- [Group](#HDFSResource_f_Group)

- [ModifiedTime](#HDFSResource_f_ModifiedTime)

- [Name](#HDFSResource_f_Name)

- [Owner](#HDFSResource_f_Owner)

- [Path](#HDFSResource_f_Path)

- [Permission](#HDFSResource_f_Permission)

- [Replication](#HDFSResource_f_Replication)

- [ResourceType](#HDFSResource_f_ResourceType)

- [Size](#HDFSResource_f_Size)

- [SymlinkTarget](#HDFSResource_f_SymlinkTarget)

## Fields

 **AccessTime** *int64 (read-only)*
*Default Value: 0*

The last access time of the resource.

This field reflects the last access time of the resource, in milliseconds relative to the Unix epoch.

 **BlockSize** *int64 (read-only)*
*Default Value: 0*

The block size of the file.

This field reflects the block size of the file, in bytes.

 **ChildCount** *int64 (read-only)*
*Default Value: 0*

The number of children in the directory.

This field reflects the number of immediate children in the directory. Always 0 for files.

 **Group** *char* (read-only)*
*Default Value: ""*

The name of the resource's group.

This field reflects the name of the resource's group.

 **ModifiedTime** *int64 (read-only)*
*Default Value: 0*

The last modified time of the resource.

This field reflects the last modified time of the resource, in milliseconds relative to the Unix epoch.

 **Name** *char* (read-only)*
*Default Value: ""*

The name of the resource.

This field reflects the name of the resource.

 **Owner** *char* (read-only)*
*Default Value: ""*

The name of the resource's owner.

This field reflects the name of the resource's owner.

 **Path** *char* (read-only)*
*Default Value: ""*

The full path of the resource.

This field reflects the full path of the resource. (Note that this field's value is not returned by the server, it is calculated by the class for convenience.)

 **Permission** *char* (read-only)*
*Default Value: ""*

The resource's permission bits.

This field reflects the resource's permission bits, represented as an octal string (e.g., *755*).

 **Replication** *int (read-only)*
*Default Value: 0*

The replication factor of the file.

This field reflects the replication factor of the file. Always 0 for directories.

A file's replication factor determines how many copies of the file's data ("replicas") are maintained by HDFS. For example, a replication factor of 3 means that HDFS will maintain 2 replicas in addition to the original file. Thus, the minimum replication factor a file can have is 1.

 **ResourceType** *int (read-only)*
*Default Value: 0*

The resource type.

This field reflects the resource's type. Possible values are:

|  |  |
| --- | --- |
| 0 (hrtFile) | A file. |
| 1 (hrtDirectory) | A directory. |
| 2 (hrtSymLink) | A symlink. |

 **Size** *int64 (read-only)*
*Default Value: 0*

The size of the file.

This field reflects the size of the file, in bytes. Always 0 for directories.

Note that the actual amount of space the file consumes will be greater than this field's value if [Replication](#HDFSResource_f_Replication) is greater than 1. In that case, multiply the values of this field and [Replication](#HDFSResource_f_Replication) to obtain the total number of bytes consumed by the file and its replicas.

 **SymlinkTarget** *char* (read-only)*
*Default Value: ""*

The full target path of the symlink.

This field reflects the full target path of the symlink, if [ResourceType](#HDFSResource_f_ResourceType) is *2 (ftSymLink)* and the server returns the target path information, or empty string otherwise.

## Constructors

```text
HDFSResource()
```

# Header Type

This is an HTTP header as it is received from the server.

## Syntax

 *CloudStorageHeader* (declared in *cloudstorage.h*)

## Remarks

When a header is received through a Header event, it is parsed into a [Header](#header-type) type. This type contains a [Field](#Header_f_Field), and its corresponding [Value](#Header_f_Value).

The following fields are available:

- [Field](#Header_f_Field)

- [Value](#Header_f_Value)

## Fields

 **Field** *char**
*Default Value: ""*

This field contains the name of the HTTP [Header](#header-type) (this is the same case as it is delivered).

 **Value** *char**
*Default Value: ""*

This field contains the [Header](#header-type) contents.

## Constructors

```text
Header()
```

```text
Header(const char* lpszField, const char* lpszValue)
```

# Proxy Type

The proxy the component will connect to.

## Syntax

 *CloudStorageProxy* (declared in *cloudstorage.h*)

## Remarks

When connecting through a proxy, this type is used to specify different properties of the proxy, such as the [Server](#Proxy_f_Server) and the [AuthScheme](#Proxy_f_AuthScheme).

The following fields are available:

- [AuthScheme](#Proxy_f_AuthScheme)

- [AutoDetect](#Proxy_f_AutoDetect)

- [Password](#Proxy_f_Password)

- [Port](#Proxy_f_Port)

- [Server](#Proxy_f_Server)

- [SSL](#Proxy_f_SSL)

- [User](#Proxy_f_User)

## Fields

 **AuthScheme** *int*
*Default Value: 0*

The type of authorization to perform when connecting to the proxy. This is used only when the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are set.

[AuthScheme](#Proxy_f_AuthScheme) should be set to authNone (3) when no authentication is expected.

By default, [AuthScheme](#Proxy_f_AuthScheme) is authBasic (0), and if the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are set, the class will attempt basic authentication.

If [AuthScheme](#Proxy_f_AuthScheme) is set to authDigest (1), digest authentication will be attempted instead.

If [AuthScheme](#Proxy_f_AuthScheme) is set to authProprietary (2), then the authorization token will not be generated by the class. Look at the configuration file for the class being used to find more information about manually setting this token.

If [AuthScheme](#Proxy_f_AuthScheme) is set to authNtlm (4), NTLM authentication will be used.

For security reasons, setting this field will clear the values of [User](#Proxy_f_User) and [Password](#Proxy_f_Password).

 **AutoDetect** *int*
*Default Value: FALSE*

Whether to automatically detect and use proxy system settings, if available. The default value is *false*.

 **Password** *char**
*Default Value: ""*

A password if authentication is to be used for the proxy.

If [AuthScheme](#Proxy_f_AuthScheme) is set to Basic Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are Base64 encoded and the proxy authentication token will be generated in the form *Basic [encoded-user-password]*.

If [AuthScheme](#Proxy_f_AuthScheme) is set to Digest Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are used to respond to the Digest Authentication challenge from the server.

If [AuthScheme](#Proxy_f_AuthScheme) is set to NTLM Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are used to authenticate through NTLM negotiation.

 **Port** *int*
*Default Value: 80*

The Transmission Control Protocol (TCP) port for the proxy [Server](#Proxy_f_Server) (default 80). See the description of the [Server](#Proxy_f_Server) field for details.

 **Server** *char**
*Default Value: ""*

If a proxy [Server](#Proxy_f_Server) is given, then the HTTP request is sent to the proxy instead of the server otherwise specified.

If the [Server](#Proxy_f_Server) field is set to a domain name, a DNS request is initiated. Upon successful termination of the request, the [Server](#Proxy_f_Server) field is set to the corresponding address. If the search is not successful, an error is returned.

 **SSL** *int*
*Default Value: 0*

When to use a Secure Sockets Layer (SSL) for the connection to the proxy. The applicable values are as follows:

|  |  |
| --- | --- |
| psAutomatic (0) | Default setting. If the URL is an https URL, the class will use the psTunnel option. If the URL is an http URL, the class will use the psNever option. |
| psAlways (1) | The connection is always SSL-enabled. |
| psNever (2) | The connection is not SSL-enabled. |
| psTunnel (3) | The connection is made through a tunneling (HTTP) proxy. |

 **User** *char**
*Default Value: ""*

A username if authentication is to be used for the proxy.

If [AuthScheme](#Proxy_f_AuthScheme) is set to Basic Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are Base64 encoded and the proxy authentication token will be generated in the form *Basic [encoded-user-password]*.

If [AuthScheme](#Proxy_f_AuthScheme) is set to Digest Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are used to respond to the Digest Authentication challenge from the server.

If [AuthScheme](#Proxy_f_AuthScheme) is set to NTLM Authentication, the [User](#Proxy_f_User) and [Password](#Proxy_f_Password) fields are used to authenticate through NTLM negotiation.

## Constructors

```text
Proxy()
```

```text
Proxy(const char* lpszServer, int iPort)
```

```text
Proxy(const char* lpszServer, int iPort, const char* lpszUser, const char* lpszPassword)
```

# QueryParam Type

A query parameter to send in the request.

## Syntax

 *CloudStorageQueryParam* (declared in *cloudstorage.h*)

## Remarks

This type represents a query parameter to send in the request.

The following fields are available:

- [Name](#QueryParam_f_Name)

- [Value](#QueryParam_f_Value)

## Fields

 **Name** *char**
*Default Value: ""*

The name of the query parameter.

This field specifies the name of the query parameter.

 **Value** *char**
*Default Value: ""*

The value of the query parameter.

This field specifies the value of the query parameter. The class will automatically URL-encode this value when sending the request.

## Constructors

```text
QueryParam()
```

```text
QueryParam(const char* lpszName, const char* lpszValue)
```

# CloudStorageList Type

## Syntax

 *CloudStorageList<T>* (declared in *cloudstorage.h*)

## Remarks

 *CloudStorageList* is a generic class that is used to hold a collection of objects of type *T*, where *T* is one of the custom types supported by the HadoopDFS class.

```text
int GetCount() {}
```

```text
int SetCount(int count) {}
```

```text
T* Get(int index) {}
```

```text
T* Set(int index, T* value) {}
```

|  |  |
| --- | --- |
| Methods |  |
| GetCount | This method returns the current size of the collection. |
| SetCount | This method sets the size of the collection. This method returns 0 if setting the size was successful; or -1 if the collection is ReadOnly. When adding additional objects to a collection call this method to specify the new size. Increasing the size of the collection preserves existing objects in the collection. |
| Get | This method gets the item at the specified position. The index parameter specifies the index of the item in the collection. This method returns NULL if an invalid index is specified. |
| Set | This method sets the item at the specified position. The index parameter specifies the index of the item in the collection that is being set. This method returns -1 if an invalid index is specified. Note: Objects created using the new operator must be freed using the delete operator; they will not be automatically freed by the class. |

# CloudStorageStream Type

## Syntax

 *CloudStorageStream* (declared in *cloudstorage.h*)

## Remarks

 The HadoopDFS class includes one or more API members that take a stream object as a parameter. To use such API members, create a concrete class that implements the CloudStorageStream interface and pass the HadoopDFS class an instance of that concrete class.

 When implementing the CloudStorageStream interface's properties and methods, they must behave as described below. If the concrete class's implementation does not behave as expected, undefined behavior may occur.

```text
bool CanRead() { return true; }
```

```text
bool CanSeek() { return true; }
```

```text
bool CanWrite() { return true; }
```

```text
int64 GetLength() = 0;
```

```text
void Close() {}
```

```text
int Flush() { return 0; }
```

```text
int Read(void* buffer, int count) = 0;
```

```text
int64 Seek(int64 offset, int seekOrigin) = 0;
```

```text
int Write(const void* buffer, int count) = 0;
```

|  |  |
| --- | --- |
| Properties |  |
| CanRead | Whether the stream supports reading. |
| CanSeek | Whether the stream supports seeking. |
| CanWrite | Whether the stream supports writing. |
| Length | Gets the length of the stream, in bytes. |
| Methods |  |
| Close | Closes the stream, releasing all resources currently allocated for it. This method is called automatically when a CloudStorageStream object is deleted. |
| Flush | Forces all data held by the stream's buffers to be written out to storage. Must return 0 if flushing is successful; or -1 if an error occurs or the stream is closed. If the stream does not support writing, this method must do nothing and return 0. |
| Read | Reads a sequence of bytes from the stream and advances the current position within the stream by the number of bytes read. Buffer specifies the buffer to populate with data from the stream. Count specifies the number of bytes that should be read from the stream. Must return the total number of bytes read into Buffer; this may be less than Count if that many bytes are not currently available, or 0 if the end of the stream has been reached. Must return -1 if an error occurs, if reading is not supported, or if the stream is closed. |
| Seek | Sets the current position within the stream based on a particular point of origin. Offset specifies the offset in the stream to seek to, relative to SeekOrigin. Valid values for SeekOrigin are: 0: Seek from beginning. 1: Seek from current position. 2: Seek from end. Must return the new position within the stream; or -1 if an error occurs, if seeking is not supported, or if the stream is closed (however, see note below). If -1 is returned, the current position within the stream must remain unchanged. Note: If the stream is not closed, it must always be possible to call this method with an Offset of 0 and a SeekOrigin of 1 to obtain the current position within the stream, even if seeking is not otherwise supported. |
| Write | Writes a sequence of bytes to the stream and advances the current position within the stream by the number of bytes written. Buffer specifies the buffer with data to write to the stream. Count specifies the number of bytes that should be written to the stream. Must return the total number of bytes written to the stream; this may be less than Count if that many bytes could not be written. Must return -1 if an error occurs, if writing is not supported, or if the stream is closed. |

# Config Settings ([HadoopDFS](#hadoopdfs-class) Class)

 The class accepts one or more of the following *configuration settings*. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the [Config](#config-method-hadoopdfs-class) method.

### HadoopDFS Config Settings

**CreatePermission**: The permission to assign when creating resources.This setting specifies the permission the server should assign to new resources created with [UploadFile](#uploadfile-method-hadoopdfs-class) and [MakeDirectory](#makedirectory-method-hadoopdfs-class).

This setting must be formatted as an octal string; it is empty by default, causing the server's default (*755*) to be used.

**DownloadTempFile**: The temporary file used when downloading encrypted data.This setting specifies the temporary file used when downloading encrypted data.

When downloading encrypted data with [LocalFile](#localfile-property-hadoopdfs-class) set, the class will automatically create a temporary file at [TempPath](#TempPath) to hold the encrypted file contents. When the download is complete, the data is decrypted to [LocalFile](#localfile-property-hadoopdfs-class).

If the download is interrupted, the specified file will hold the partially downloaded encrypted file contents. Before resuming the download, this setting must be set to a valid file containing the partially encrypted file contents. See [DownloadFile](#downloadfile-method-hadoopdfs-class) for details.

**EncryptionIV**: The initialization vector to be used for encryption/decryption.When encrypting or decrypting a file, this setting may be set to specify the initialization vector. Normally the class will derive this value automatically from [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class).

This setting accepts a hex encoded value.

**EncryptionKey**: The key to use during encryption/decryption.When encrypting or decrypting a file, this setting may be set to specify the key to use. Normally the class will derive this value automatically from [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class).

This setting accepts a hex encoded value.

**EncryptionPasswordKDF**: The KDF algorithm to use during password based encryption and decryption.This setting specified the Key Derivation Function (KDF) used to derive a key from the specified [EncryptionPassword](#encryptionpassword-property-hadoopdfs-class). Possible values are:

- 0 (default) - PBKDF1
- 1 - PBKDF2

 Note: PBKDF1 is not FIPS compliant. When operating in FIPS mode PBKDF2 should be used.

**HomeDir**: Can be queried to obtain the current user's home directory path.This setting can be queried to obtain the current user's home directory path. Note that the server does not guarantee that a directory actually exists at the returned path.

**ProgressAbsolute**: Whether the class should track transfer progress absolutely.This setting controls whether the class tracks upload and download progress absolutely or relatively, with regards to the values reported via the [Progress](#progress-event-hadoopdfs-class) event when an interrupted transfer is resumed.

If this setting is enabled (default), then when a transfer is interrupted and later resumed, the values reported by the [Progress](#progress-event-hadoopdfs-class) event will account for the data that was successfully transferred before the interruption.

If this setting is disabled, then the class will treat resumed transfers as "new" transfers, and the values reported by the [Progress](#progress-event-hadoopdfs-class) event will start at *0* rather than from the number of bytes already transferred.

Refer to the [Progress](#progress-event-hadoopdfs-class) event for more information.

**ProgressStep**: How often the progress event should be fired, in terms of percentage.This setting controls how often the class will fire the [Progress](#progress-event-hadoopdfs-class) event during an upload or download, in terms of percentage. Valid values are *0* to *99*, inclusive.

The default value, *1*, will cause the [Progress](#progress-event-hadoopdfs-class) event to fire each time the event's *PercentDone* parameter value increases by one percent. Setting this setting to *0* will cause the [Progress](#progress-event-hadoopdfs-class) event to fire *every* time data is transferred.

Note that the [Progress](#progress-event-hadoopdfs-class) event will *always* fire once at the beginning and end of a transfer, regardless of this setting's value. Also, if *PercentDone* cannot be calculated for a particular transfer (e.g., for downloads that use chunked transfer encoding), then the class will behave as if this setting were *0* for the duration of the transfer.

**RawRequest**: Returns the data that was sent to the server.This setting may be queried after calling any method that sends data to the server to obtain the request data that was transmitted. Such data may be useful for troubleshooting purposes.

**RawResponse**: Returns the data that was received from the server.This setting may be queried after calling any method that sends data to the server to obtain the response data that was received. Such data may be useful for troubleshooting purposes.

**RecursiveDelete**: Whether to recursively delete non-empty directories.This setting specifies whether non-empty directories should be recursively deleted when [DeleteResource](#deleteresource-method-hadoopdfs-class) is called.

By default this setting is enabled. If this setting is disabled, non-empty directories must be emptied before they can be deleted.

**TempPath**: The path to the directory where temporary files are created.This setting specifies the path where temporary files are created when downloading encrypted files. If not specified, the system's temporary directory is used. Refer to [DownloadTempFile](#DownloadTempFile) and [DownloadFile](#downloadfile-method-hadoopdfs-class) for more information.

**XChildCount**: The number of child elements of the current element.This configuration settings specifies the number of child attributes of the current element. The XChild configuration settings will be indexed from 0 to ([XChildCount](#XChildCount) - 1).

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XChildName[i]**: The name of the child element.This configuration setting provides the name of the i-th child element of the current element.

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XChildXText[i]**: The inner text of the child element.This configuration setting provides the inner text of the i-th child element of the current element.

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XElement**: The name of the current element.This configuration setting provides the name of the current element.

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XParent**: The parent of the current element.This configuration setting provides the parent of the current element.

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XPath**: Provides a way to point to a specific element in the returned XML or JSON response.The [XPath](#XPath) setting allows you to point to specific elements in the XML or JSON response.

When [XPath](#XPath) is set to a valid path, [XElement](#XElement) points to the name of the element, with [XText](#XText), [XParent](#XParent), [XSubTree](#XSubTree), [XChildCount](#XChildCount), [XChildName\[i\]](#XChildName[i]), and [XChildXText\[i\]](#XChildXText[i]) providing other properties of the element.

XPath syntax is available for both XML and JSON documents. An XPath is a series of one or more element accessors separated by the */* character, for example, */A/B/C/D*. An XPath can be absolute (i.e., it starts with */*), or it can be relative to the current [XPath](#XPath) location.

The following are possible values for an element accessor, which operates relative to the current location specified by the XPath accessors, which proceed it in the overall XPath string:

| Accessor | Description |
| --- | --- |
| name | The first element with a particular name. Can be *. |
| [i] | The i-th element. |
| name[i] | The i-th element with a particular name. |
| [last()] | The last element. |
| [last()-i] | The element i before the last element. |
| name[@attrname="attrvalue"] | The first element with a particular name that contains the specified attribute-value pair. Supports single and double quotes. (XML Only) |
| . | The current element. |
| .. | The parent element. |

 NOTE: XPath indices are *1-based*.

For example, assume the following XML and JSON responses.

XML:

```text
<firstlevel>
  <one>value</one>
  <two>
    <item>first</item>
    <item>second</item>
  </two>
  <three>value three</three>
</firstlevel>
```

JSON:

```text
{
  "firstlevel": {
    "one": "value",
    "two": ["first", "second"],
    "three": "value three"
  }
}
```

The following are examples of valid XPaths for these responses:

| Description | XML XPath | JSON XPath |
| --- | --- | --- |
| Document root | / | /json |
| Specific element | /firstlevel/one | /json/firstlevel/one |
| i-th child | /firstlevel/two/item[2] | /json/firstlevel/two/[2] |

This list is not exhaustive, but it provides a general idea of the possibilities.

**XSubTree**: A snapshot of the current element in the document.This configuration setting provides the entirety of the current element (including its subelements).

The current element is specified through the [XPath](#XPath) configuration setting. This configuration setting is read-only.

**XText**: The text of the current element.This configuration setting provides the inner text of the current element.

The current element is specified in the [XPath](#XPath) configuration setting. This configuration setting is read-only.

### HTTP Config Settings

**AcceptEncoding**: Used to tell the server which types of content encodings the client supports.When [AllowHTTPCompression](#AllowHTTPCompression) is True, the class adds an *Accept-Encoding* header to the request being sent to the server. By default, this header's value is "gzip, deflate". This configuration setting allows you to change the value of the *Accept-Encoding* header. NOTE: The class only supports gzip and deflate decompression algorithms.

**AllowHTTPCompression**: This property enables HTTP compression for receiving data.This configuration setting enables HTTP compression for receiving data. When set to True (default), the class will accept compressed data. It then will uncompress the data it has received. The class will handle data compressed by both gzip and deflate compression algorithms.

When True, the class adds an *Accept-Encoding* header to the outgoing request. The value for this header can be controlled by the [AcceptEncoding](#AcceptEncoding) configuration setting. The default value for this header is "gzip, deflate".

The default value is True.

**AllowHTTPFallback**: Whether HTTP/2 connections are permitted to fallback to HTTP/1.1.This configuration setting controls whether HTTP/2 connections are permitted to fall back to HTTP/1.1 when the server does not support HTTP/2. This setting is applicable only when HTTPVersion is set to "2.0".

If set to True (default), the class will automatically use HTTP/1.1 if the server does not support HTTP/2. If set to False, the class fails with an error if the server does not support HTTP/2.

The default value is True.

**Append**: Whether to append data to LocalFile.This configuration setting determines whether data will be appended when writing to [LocalFile](#localfile-property-hadoopdfs-class). When set to True, downloaded data will be appended to [LocalFile](#localfile-property-hadoopdfs-class). This may be used in conjunction with Range to resume a failed download. This is applicable only when [LocalFile](#localfile-property-hadoopdfs-class) is set. The default value is False.

**Authorization**: The Authorization string to be sent to the server.If the [Authorization](#Authorization) property contains a nonempty string, an *Authorization* HTTP request header is added to the request. This header conveys Authorization information to the server.

This property is provided so that the HTTP class can be extended with other security schemes in addition to the authorization schemes already implemented by the class.

The AuthScheme property defines the authentication scheme used. In the case of HTTP Basic Authentication (default), every time [User](#user-property-hadoopdfs-class) and [Password](#password-property-hadoopdfs-class) are set, they are Base64 encoded, and the result is put in the [Authorization](#authorization-property-hadoopdfs-class) property in the form "Basic [encoded-user-password]".

**BytesTransferred**: Contains the number of bytes transferred in the response data.This configuration setting returns the raw number of bytes from the HTTP response data, before the component processes the data, whether it is chunked or compressed. This returns the same value as the [Transfer](#transfer-event-hadoopdfs-class) event, by [BytesTransferred](#BytesTransferred).

**ChunkSize**: Specifies the chunk size in bytes when using chunked encoding.This is applicable only when [UseChunkedEncoding](#UseChunkedEncoding) is True. This setting specifies the chunk size in bytes to be used when posting data. The default value is 16384.

**CompressHTTPRequest**: Set to true to compress the body of a PUT or POST request.If set to True, the body of a *PUT* or *POST* request will be compressed into gzip format before sending the request. The "Content-Encoding" header is also added to the outgoing request.

The default value is False.

**EncodeURL**: If set to True the URL will be encoded by the class.If set to True, the URL passed to the class will be URL encoded. The default value is False.

**FollowRedirects**: Determines what happens when the server issues a redirect.This option determines what happens when the server issues a redirect. Normally, the class returns an error if the server responds with an "Object Moved" message. If this property is set to 1 (always), the new [URL](#url-property-hadoopdfs-class) for the object is retrieved automatically every time.

If this property is set to 2 (Same Scheme), the new [URL](#url-property-hadoopdfs-class) is retrieved automatically only if the URL Scheme is the same; otherwise, the class fails with an error.

**Note:** Following the HTTP specification, unless this option is set to 1 (Always), automatic redirects will be performed only for *GET* or *HEAD* requests. Other methods potentially could change the conditions of the initial request and create security vulnerabilities.

Furthermore, if either the new URL server or port are different from the existing one, [User](#user-property-hadoopdfs-class) and [Password](#password-property-hadoopdfs-class) are also reset to empty, unless this property is set to 1 (Always), in which case the same credentials are used to connect to the new server.

A Redirect event is fired for every URL the product is redirected to. In the case of automatic redirections, the Redirect event is a good place to set properties related to the new connection (e.g., new authentication parameters).

The default value is 0 (Never). In this case, redirects are never followed, and the class fails with an error instead.

Following are the valid options:

- 0 - Never
- 1 - Always
- 2 - Same Scheme

**GetOn302Redirect**: If set to True the class will perform a GET on the new location.The default value is False. If set to True, the class will perform a *GET* on the new location. Otherwise, it will use the same HTTP method again.

**HTTP2HeadersWithoutIndexing**: HTTP2 headers that should not update the dynamic header table with incremental indexing.HTTP/2 servers maintain a dynamic table of headers and values seen over the course of a connection. Typically, these headers are inserted into the table through incremental indexing (also known as HPACK, defined in RFC 7541). To tell the component not to use incremental indexing for certain headers, and thus not update the dynamic table, set this configuration option to a comma-delimited list of the header names.

**HTTPVersion**: The version of HTTP used by the class.This property specifies the HTTP version used by the class. Possible values are as follows:

- "1.0"
- "1.1" (default)
- "2.0"
- "3.0"

When using HTTP/2 ("2.0") or HTTP/3 ("3.0"), additional restrictions apply. Please see the following notes for details.

**HTTP/2 Notes**

When using HTTP/2, a secure Secure Sockets Layer/Transport Layer Security (TLS/SSL) connection is required. Attempting to use a plaintext URL with HTTP/2 will result in an error.

If the server does not support HTTP/2, the class will automatically use HTTP/1.1 instead. This is done to provide compatibility without the need for any additional settings. To see which version was used, check [NegotiatedHTTPVersion](#NegotiatedHTTPVersion) after calling a method. The [AllowHTTPFallback](#AllowHTTPFallback) setting controls whether this behavior is allowed (default) or disallowed.

**HTTP/3 Notes**

HTTP/3 is supported only in .NET and Java.

When using HTTP/3, a secure (TLS/SSL) connection is required. Attempting to use a plaintext URL with HTTP/3 will result in an error.

**IfModifiedSince**: A date determining the maximum age of the desired document.If this setting contains a nonempty string, an If-Modified-Since HTTP header is added to the request. The value of this header is used to make the HTTP request conditional: if the requested documented has not been modified since the time specified in the field, a copy of the document will not be returned from the server; instead, a 304 (not modified) response will be returned by the server and the component throws an exception

The format of the date value for IfModifiedSince is detailed in the HTTP specs. For example:

```text
Sat, 29 Oct 2017 19:43:31 GMT.
```

**KeepAlive**: Determines whether the HTTP connection is closed after completion of the request.If *true*, the component will not send the *Connection: Close* header. The absence of the Connection header indicates to the server that HTTP persistent connections should be used if supported. NOTE: Not all servers support persistent connections. If *false*, the connection will be closed immediately after the server response is received.

 The default value for [KeepAlive](#KeepAlive) is *false*.

**KerberosSPN**: The Service Principal Name for the Kerberos Domain Controller.If the Service Principal Name on the Kerberos Domain Controller is not the same as the URL that you are authenticating to, the Service Principal Name should be set here.

**LogLevel**: The level of detail that is logged.This configuration setting controls the level of detail that is logged through the [Log](#log-event-hadoopdfs-class) event. Possible values are as follows:

|  |  |
| --- | --- |
| 0 (None) | No events are logged. |
| 1 (Info - default) | Informational events are logged. |
| 2 (Verbose) | Detailed data are logged. |
| 3 (Debug) | Debug data are logged. |

The value 1 (Info) logs basic information, including the URL, HTTP version, and status details.

The value 2 (Verbose) logs additional information about the request and response.

The value 3 (Debug) logs the headers and body for both the request and response, as well as additional debug information (if any).

**MaxRedirectAttempts**: Limits the number of redirects that are followed in a request.When FollowRedirects is set to any value other than frNever, the class will follow redirects until this maximum number of redirect attempts are made. The default value is 20.

**NegotiatedHTTPVersion**: The negotiated HTTP version.This configuration setting may be queried after the request is complete to indicate the HTTP version used. When HTTPVersion is set to "2.0" (if the server does not support "2.0"), then the class will fall back to using "1.1" automatically. This setting will indicate which version was used.

**OtherHeaders**: Other headers as determined by the user (optional).This configuration setting can be set to a string of headers to be appended to the HTTP request headers.

The headers must follow the format "header: value" as described in the HTTP specifications. Header lines should be separated by CRLF (*"\r\n"*) .

Use this configuration setting with caution. If this configuration setting contains invalid headers, HTTP requests may fail.

This configuration setting is useful for extending the functionality of the class beyond what is provided.

**ProxyAuthorization**: The authorization string to be sent to the proxy server.This is similar to the [Authorization](#Authorization) configuration setting, but is used for proxy authorization. If this configuration setting contains a nonempty string, a *Proxy-Authorization* HTTP request header is added to the request. This header conveys proxy Authorization information to the server. If [User](#Proxy_f_User) and [Password](#Proxy_f_Password) are specified, this value is calculated using the algorithm specified by [AuthScheme](#Proxy_f_AuthScheme).

**ProxyAuthScheme**: The authorization scheme to be used for the proxy.This configuration setting is provided for use by classes that do not directly expose Proxy properties.

**ProxyPassword**: A password if authentication is to be used for the proxy.This configuration setting is provided for use by classes that do not directly expose Proxy properties.

**ProxyPort**: Port for the proxy server (default 80).This configuration setting is provided for use by classes that do not directly expose Proxy properties.

**ProxyServer**: Name or IP address of a proxy server (optional).This configuration setting is provided for use by classes that do not directly expose Proxy properties.

**ProxyUser**: A user name if authentication is to be used for the proxy.This configuration setting is provided for use by classes that do not directly expose Proxy properties.

**SentHeaders**: The full set of headers as sent by the client.This configuration setting returns the complete set of raw headers as sent by the client.

**StatusCode**: The status code of the last response from the server.This configuration setting contains the result code of the last response from the server.

**StatusLine**: The first line of the last response from the server.This setting contains the first line of the last response from the server. The format of the line will be *[HTTP version] [Result Code] [Description]*.

**TransferredData**: The contents of the last response from the server.This configuration setting contains the contents of the last response from the server.

**TransferredDataLimit**: The maximum number of incoming bytes to be stored by the class.If [TransferredDataLimit](#TransferredDataLimit) is set to 0 (default), no limits are imposed. Otherwise, this reflects the maximum number of incoming bytes that can be stored by the class.

**TransferredHeaders**: The full set of headers as received from the server.This configuration setting returns the complete set of raw headers as received from the server.

**TransferredRequest**: The full request as sent by the client.This configuration setting returns the full request as sent by the client. For performance reasons, the request is not normally saved. Set this configuration setting to ON before making a request to enable it. Following are examples of this request:

 .NET

```text
Http http = new Http();
http.Config("TransferredRequest=on");
http.PostData = "body";
http.Post("http://someserver.com");
Console.WriteLine(http.Config("TransferredRequest"));
```

 C++

```text
HTTP http;
http.Config("TransferredRequest=on");
http.SetPostData("body", 5);
http.Post("http://someserver.com");
printf("%s\r\n", http.Config("TransferredRequest"));
```

**UseChunkedEncoding**: Enables or Disables HTTP chunked encoding for transfers.If [UseChunkedEncoding](#UseChunkedEncoding) is set to True, the class will use HTTP-chunked encoding when posting, if possible. HTTP-chunked encoding allows large files to be sent in chunks instead of all at once. If set to False, the class will not use HTTP-chunked encoding. The default value is False.

NOTE: Some servers (such as the ASP.NET Development Server) may not support chunked encoding.

**UseIDNs**: Whether to encode hostnames to internationalized domain names.This configuration setting specifies whether hostnames containing non-ASCII characters are encoded to internationalized domain names. When set to True, if a hostname contains non-ASCII characters, it is encoded using Punycode to an IDN (internationalized domain name).

The default value is False and the hostname will always be used exactly as specified. NOTE: The [CodePage](#CodePage) setting must be set to a value capable of interpreting the specified host name. For instance, to specify UTF-8, set [CodePage](#CodePage) to *65001*. In the C++ Edition for Windows, the *W version of the class must be used. For instance, *DNSW* or *HTTPW*.

**UsePlatformHTTPClient**: Whether or not to use the platform HTTP client.When using this configuration setting, if True, the component will use the default HTTP client for the platform (*URLConnection* in Java, *WebRequest* in .NET, or CFHTTPMessage in Mac/iOS) instead of the internal HTTP implementation. This is important for environments in which direct access to sockets is limited or not allowed (e.g., in the Google AppEngine).

NOTE: This setting is applicable only to Mac/iOS editions.

**UseProxyAutoConfigURL**: Whether to use a Proxy auto-config file when attempting a connection.This configuration specifies whether the class will attempt to use the Proxy auto-config URL when establishing a connection and [AutoDetect](#Proxy_f_AutoDetect) is set to *True*.

When *True* (default), the class will check for the existence of a Proxy auto-config URL, and if found, will determine the appropriate proxy to use.

**UserAgent**: Information about the user agent (browser).This is the value supplied in the HTTP User-Agent header. The default setting is "IPWorks HTTP Component - www.nsoftware.com".

Override the default with the name and version of your software.

### TCPClient Config Settings

**ConnectionTimeout**: Sets a separate timeout value for establishing a connection.When set, this configuration setting allows you to specify a different timeout value for establishing a connection. Otherwise, the class will use [Timeout](#timeout-property-hadoopdfs-class) for establishing a connection and transmitting/receiving data.

**FirewallAutoDetect**: Tells the class whether or not to automatically detect and use firewall system settings, if available.This configuration setting is provided for use by classes that do not directly expose Firewall properties.

**FirewallHost**: Name or IP address of firewall (optional).If a [FirewallHost](#FirewallHost) is given, requested connections will be authenticated through the specified firewall when connecting.

If the [FirewallHost](#FirewallHost) setting is set to a Domain Name, a DNS request is initiated. Upon successful termination of the request, the [FirewallHost](#FirewallHost) setting is set to the corresponding address. If the search is not successful, an error is returned.

NOTE: This setting is provided for use by classes that do not directly expose Firewall properties.

**FirewallHTTPVersion**: The HTTP version to be used when connecting through a tunneling proxy.When [FirewallType](#FirewallType) is set to a tunneling proxy, this setting dictates which HTTP version is used when connecting.

**FirewallPassword**: Password to be used if authentication is to be used when connecting through the firewall.If [FirewallHost](#FirewallHost) is specified, the [FirewallUser](#FirewallUser) and [FirewallPassword](#FirewallPassword) settings are used to connect and authenticate to the given firewall. If the authentication fails, the class fails with an error.

NOTE: This setting is provided for use by classes that do not directly expose Firewall properties.

**FirewallPort**: The TCP port for the FirewallHost;.The [FirewallPort](#FirewallPort) is set automatically when [FirewallType](#FirewallType) is set to a valid value.

NOTE: This configuration setting is provided for use by classes that do not directly expose Firewall properties.

**FirewallType**: Determines the type of firewall to connect through.Possible values are as follows:

|  |  |
| --- | --- |
| 0 | No firewall (default setting). |
| 1 | Connect through a tunneling proxy. [FirewallPort](#FirewallPort) is set to 80. |
| 2 | Connect through a SOCKS4 Proxy. [FirewallPort](#FirewallPort) is set to 1080. |
| 3 | Connect through a SOCKS5 Proxy. [FirewallPort](#FirewallPort) is set to 1080. |
| 10 | Connect through a SOCKS4A Proxy. [FirewallPort](#FirewallPort) is set to 1080. |

NOTE: This setting is provided for use by classes that do not directly expose Firewall properties.

**FirewallUser**: A user name if authentication is to be used connecting through a firewall.If the [FirewallHost](#FirewallHost) is specified, the [FirewallUser](#FirewallUser) and [FirewallPassword](#FirewallPassword) settings are used to connect and authenticate to the Firewall. If the authentication fails, the class fails with an error.

NOTE: This setting is provided for use by classes that do not directly expose Firewall properties.

**KeepAliveInterval**: The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.When set, [TCPKeepAlive](#TCPKeepAlive) will automatically be set to True. A TCP keep-alive packet will be sent after a period of inactivity as defined by [KeepAliveTime](#KeepAliveTime). If no acknowledgment is received from the remote host, the keep-alive packet will be sent again. This configuration setting specifies the interval at which the successive keep-alive packets are sent in milliseconds. This system default if this value is not specified here is 1 second.

NOTE: This value is not applicable in macOS.

**KeepAliveRetryCount**: The number of keep-alive packets to be sent before the remotehost is considered disconnected.When set, [TCPKeepAlive](#TCPKeepAlive) will automatically be set to True. A TCP keep-alive packet will be sent after a period of inactivity as defined by [KeepAliveTime](#KeepAliveTime). If no acknowledgment is received from the remote host, the keep-alive packet will be sent again. This configuration setting specifies the number of times that the keep-alive packets will be sent before the remote host is considered disconnected. The system default if this value is not specified here is 9.

NOTE: This configuration setting is only available in the Unix platform. It is not supported in masOS or FreeBSD.

**KeepAliveTime**: The inactivity time in milliseconds before a TCP keep-alive packet is sent.When set, [TCPKeepAlive](#TCPKeepAlive) will automatically be set to True. By default, the operating system will determine the time a connection is idle before a Transmission Control Protocol (TCP) keep-alive packet is sent. This system default if this value is not specified here is 2 hours. In many cases, a shorter interval is more useful. Set this value to the desired interval in milliseconds.

**Linger**: When set to True, connections are terminated gracefully.This property controls how a connection is closed. The default is True.

In the case that Linger is True (default), two scenarios determine how long the connection will linger. In the first, if [LingerTime](#LingerTime) is 0 (default), the system will attempt to send pending data for a connection until the default IP timeout expires.

In the second scenario, if [LingerTime](#LingerTime) is a positive value, the system will attempt to send pending data until the specified [LingerTime](#LingerTime) is reached. If this attempt fails, then the system will reset the connection.

The default behavior (which is also the default mode for stream sockets) might result in a long delay in closing the connection. Although the class returns control immediately, the system could hold system resources until all pending data are sent (even after your application closes).

Setting this property to False forces an immediate disconnection. If you know that the other side has received all the data you sent (e.g., by a client acknowledgment), setting this property to False might be the appropriate course of action.

**LingerTime**: Time in seconds to have the connection linger. LingerTime is the time, in seconds, the socket connection will linger. This value is 0 by default, which means it will use the default IP timeout.

**LocalHost**: The name of the local host through which connections are initiated or accepted. The [LocalHost](#localhost-property-hadoopdfs-class) setting contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface), setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classes) only through that interface.

If the class is connected, the [LocalHost](#localhost-property-hadoopdfs-class) setting shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

**LocalPort**: The port in the local host where the class binds. This configuration setting must be set before a connection is attempted. It instructs the class to bind to a specific port (or communication endpoint) in the local machine.

Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by LocalPort after the connection is established.

LocalPort cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error.

This configuration setting is useful when trying to connect to services that require a trusted port on the client side. An example is the remote shell (rsh) service in UNIX systems.

**MaxLineLength**: The maximum amount of data to accumulate when no EOL is found.[MaxLineLength](#MaxLineLength) is the size of an internal buffer, which holds received data while waiting for an EOL string.

If an EOL string is found in the input stream before [MaxLineLength](#MaxLineLength) bytes are received, the DataIn event is fired with the *EOL* parameter set to True, and the buffer is reset.

If no EOL is found, and [MaxLineLength](#MaxLineLength) bytes are accumulated in the buffer, the DataIn event is fired with the *EOL* parameter set to False, and the buffer is reset.

The minimum value for [MaxLineLength](#MaxLineLength) is 256 bytes. The default value is 2048 bytes.

**MaxTransferRate**: The transfer rate limit in bytes per second.This configuration setting can be used to throttle outbound TCP traffic. Set this to the number of bytes to be sent per second. By default, this is not set and there is no limit.

**ProxyExceptionsList**: A semicolon separated list of hosts and IPs to bypass when using a proxy.This configuration setting optionally specifies a semicolon-separated list of hostnames or IP addresses to bypass when a proxy is in use. When requests are made to hosts specified in this property, the proxy will not be used. For instance:

*www.google.com;www.example.com*

**TCPKeepAlive**: Determines whether or not the keep alive socket option is enabled.If set to True, the socket's keep-alive option is enabled and keep-alive packets will be sent periodically to maintain the connection. Set [KeepAliveTime](#KeepAliveTime) and [KeepAliveInterval](#KeepAliveInterval) to configure the timing of the keep-alive packets.

NOTE: This value is not applicable in Java.

**TcpNoDelay**: Whether or not to delay when sending packets. When set to True, the socket will send all data that are ready to send at once. When set to False, the socket will send smaller buffered packets of data at small intervals. This is known as the Nagle algorithm.

By default, this configuration setting is set to False.

**UseIPv6**: Whether to use IPv6.When set to *0* (default), the class will use IPv4 exclusively. When set to *1*, the class will use IPv6 exclusively. To instruct the class to prefer IPv6 addresses, but use IPv4 if IPv6 is not supported on the system, this setting should be set to *2*. The default value is *0*. Possible values are as follows:

|  |  |
| --- | --- |
| 0 | IPv4 only |
| 1 | IPv6 only |
| 2 | IPv6 with IPv4 fallback |

**UseNTLMv2**: Whether to use NTLM V2.When authenticating with NTLM, this setting specifies whether NTLM V2 is used. By default this value is True and NTLM V2 will be used. Set this to False to use NTLM V1.

### SSL Config Settings

**LogSSLPackets**: Controls whether SSL packets are logged when using the internal security API.When [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*, this configuration setting controls whether Secure Sockets Layer (SSL) packets should be logged. By default, this configuration setting is *False*, as it is useful only for debugging purposes.

When enabled, SSL packet logs are output using the [SSLStatus](#sslstatus-event-hadoopdfs-class) event, which will fire each time an SSL packet is sent or received.

Enabling this configuration setting has no effect if [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Platform*.

**OpenSSLCADir**: The path to a directory containing CA certificates.This functionality is available only when the provider is OpenSSL.

The path set by this property should point to a directory containing CA certificates in PEM format. The files each contain one CA certificate. The files are looked up by the CA subject name hash value, which must hence be available. If more than one CA certificate with the same name hash value exist, the extension must be different (e.g., 9d66eef0.0, 9d66eef0.1). OpenSSL recommends the use of the c_rehash utility to create the necessary links. Please refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details.

**OpenSSLCAFile**: Name of the file containing the list of CA's trusted by your application.This functionality is available only when the provider is OpenSSL.

The file set by this property should contain a list of CA certificates in PEM format. The file can contain several CA certificates identified by the following sequences:

 -----BEGIN CERTIFICATE-----

 ... (CA certificate in base64 encoding) ...

 -----END CERTIFICATE-----

 Before, between, and after the certificate text is allowed, which can be used, for example, for descriptions of the certificates. Refer to the OpenSSL man page SSL_CTX_load_verify_locations(3) for details.

**OpenSSLCipherList**: A string that controls the ciphers to be used by SSL.This functionality is available only when the provider is OpenSSL.

The format of this string is described in the OpenSSL man page ciphers(1) section "CIPHER LIST FORMAT". Please refer to it for details. The default string "DEFAULT" is determined at compile time and is normally equivalent to "ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH".

**OpenSSLPrngSeedData**: The data to seed the pseudo random number generator (PRNG).This functionality is available only when the provider is OpenSSL.

By default, OpenSSL uses the device file "/dev/urandom" to seed the PRNG, and setting OpenSSLPrngSeedData is not required. If set, the string specified is used to seed the PRNG.

**ReuseSSLSession**: Determines if the SSL session is reused.

If set to True, the class will reuse the context if and only if the following criteria are met:

- The target host name is the same.
- The system cache entry has not expired (default timeout is 10 hours).
- The application process that calls the function is the same.
- The logon session is the same.
- The instance of the class is the same.

**SSLCACertFilePaths**: The paths to CA certificate files on Unix/Linux.This configuration setting specifies the paths on disk to CA certificate files on Unix/Linux.

The value is formatted as a list of paths separated by semicolons. The class will check for the existence of each file in the order specified. When a file is found, the CA certificates within the file will be loaded and used to determine the validity of server or client certificates.

The default value is as follows:

*/etc/ssl/ca-bundle.pem;/etc/pki/tls/certs/ca-bundle.crt;/etc/ssl/certs/ca-certificates.crt;/etc/pki/tls/cacert.pem*

**SSLCACerts**: A newline separated list of CA certificates to be included when performing an SSL handshake.When [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*, this configuration setting specifies one or more CA certificates to be included with the [SSLCert](#sslcert-property-hadoopdfs-class) property. Some servers or clients require the entire chain, including CA certificates, to be presented when performing SSL authentication. The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance:

```text
-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert ...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert ...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----
```

**SSLCipherStrength**: The minimum cipher strength used for bulk encryption. This minimum cipher strength is largely dependent on the security modules installed on the system. If the cipher strength specified is not supported, an error will be returned when connections are initiated.

NOTE: This configuration setting contains the minimum cipher strength requested from the security library. The actual cipher strength used for the connection is shown by the [SSLStatus](#sslstatus-event-hadoopdfs-class) event.

Use this configuration setting with caution. Requesting a lower cipher strength than necessary could potentially cause serious security vulnerabilities in your application.

When the provider is OpenSSL, [SSLCipherStrength](#SSLCipherStrength) is currently not supported. This functionality is instead made available through the [OpenSSLCipherList](#OpenSSLCipherList) configuration setting.

**SSLClientCACerts**: A newline separated list of CA certificates to use during SSL client certificate validation.This configuration setting is only applicable to server components (e.g., TCPServer) see [SSLServerCACerts](#SSLServerCACerts) for client components (e.g., TCPClient). This setting can be used to optionally specify one or more CA certificates to be used when verifying the client certificate that is presented by the client during the SSL handshake when SSLAuthenticateClients is enabled. When verifying the client's certificate, the certificates trusted by the system will be used as part of the verification process. If the client's CA certificates are not installed to the trusted system store, they may be specified here so they are included when performing the verification process. This configuration setting should be set only if the client's CA certificates are not already trusted on the system and cannot be installed to the trusted system store.

The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance:

```text
-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert ...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert ...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----
```

**SSLEnabledCipherSuites**: The cipher suite to be used in an SSL negotiation.This configuration setting enables the cipher suites to be used in SSL negotiation.

By default, the enabled cipher suites will include all available ciphers ("*").

The special value "*" means that the class will pick all of the supported cipher suites. If [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) is set to any other value, only the specified cipher suites will be considered.

Multiple cipher suites are separated by semicolons.

Example values when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Platform* include the following:

```text
obj.config("SSLEnabledCipherSuites=*");
obj.config("SSLEnabledCipherSuites=CALG_AES_256");
obj.config("SSLEnabledCipherSuites=CALG_AES_256;CALG_3DES");
```

 Possible values when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Platform* include the following:

- CALG_3DES
- CALG_3DES_112
- CALG_AES
- CALG_AES_128
- CALG_AES_192
- CALG_AES_256
- CALG_AGREEDKEY_ANY
- CALG_CYLINK_MEK
- CALG_DES
- CALG_DESX
- CALG_DH_EPHEM
- CALG_DH_SF
- CALG_DSS_SIGN
- CALG_ECDH
- CALG_ECDH_EPHEM
- CALG_ECDSA
- CALG_ECMQV
- CALG_HASH_REPLACE_OWF
- CALG_HUGHES_MD5
- CALG_HMAC
- CALG_KEA_KEYX
- CALG_MAC
- CALG_MD2
- CALG_MD4
- CALG_MD5
- CALG_NO_SIGN
- CALG_OID_INFO_CNG_ONLY
- CALG_OID_INFO_PARAMETERS
- CALG_PCT1_MASTER
- CALG_RC2
- CALG_RC4
- CALG_RC5
- CALG_RSA_KEYX
- CALG_RSA_SIGN
- CALG_SCHANNEL_ENC_KEY
- CALG_SCHANNEL_MAC_KEY
- CALG_SCHANNEL_MASTER_HASH
- CALG_SEAL
- CALG_SHA
- CALG_SHA1
- CALG_SHA_256
- CALG_SHA_384
- CALG_SHA_512
- CALG_SKIPJACK
- CALG_SSL2_MASTER
- CALG_SSL3_MASTER
- CALG_SSL3_SHAMD5
- CALG_TEK
- CALG_TLS1_MASTER
- CALG_TLS1PRF

 Example values when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*include the following:

```text
obj.config("SSLEnabledCipherSuites=*");
obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA");
obj.config("SSLEnabledCipherSuites=TLS_DHE_DSS_WITH_AES_128_CBC_SHA;TLS_ECDH_RSA_WITH_AES_128_CBC_SHA");
```

 Possible values when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal* include the following:

- TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
- TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
- TLS_RSA_WITH_AES_256_GCM_SHA384
- TLS_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256
- TLS_DHE_DSS_WITH_AES_256_GCM_SHA384
- TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
- TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256
- TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_DHE_DSS_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
- TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
- TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384
- TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
- TLS_RSA_WITH_AES_256_CBC_SHA256
- TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
- TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384
- TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
- TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
- TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
- TLS_RSA_WITH_AES_128_CBC_SHA256
- TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256
- TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256
- TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
- TLS_RSA_WITH_AES_256_CBC_SHA
- TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
- TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
- TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA
- TLS_DHE_RSA_WITH_AES_256_CBC_SHA
- TLS_ECDH_RSA_WITH_AES_256_CBC_SHA
- TLS_DHE_DSS_WITH_AES_256_CBC_SHA
- TLS_RSA_WITH_AES_128_CBC_SHA
- TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
- TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
- TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA
- TLS_ECDH_RSA_WITH_AES_128_CBC_SHA
- TLS_DHE_RSA_WITH_AES_128_CBC_SHA
- TLS_DHE_DSS_WITH_AES_128_CBC_SHA
- TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
- TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA
- TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA
- TLS_RSA_WITH_3DES_EDE_CBC_SHA
- TLS_RSA_WITH_DES_CBC_SHA
- TLS_DHE_RSA_WITH_DES_CBC_SHA
- TLS_DHE_DSS_WITH_DES_CBC_SHA
- TLS_RSA_WITH_RC4_128_MD5
- TLS_RSA_WITH_RC4_128_SHA

When TLS 1.3 is negotiated (see [SSLEnabledProtocols](#SSLEnabledProtocols)), only the following cipher suites are supported:

- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256
- TLS_AES_128_GCM_SHA256

[SSLEnabledCipherSuites](#SSLEnabledCipherSuites) is used together with [SSLCipherStrength](#SSLCipherStrength).

**SSLEnabledProtocols**: Used to enable/disable the supported security protocols.This configuration setting is used to enable or disable the supported security protocols.

Not all supported protocols are enabled by default. The default value is *4032* for client components, and *3072* for server components. To specify a combination of enabled protocol versions set this config to the binary *OR* of one or more of the following values:

|  |  |
| --- | --- |
| TLS1.3 | 12288 (Hex 3000) |
| TLS1.2 | 3072 (Hex C00) (Default - Client and Server) |
| TLS1.1 | 768 (Hex 300) (Default - Client) |
| TLS1 | 192 (Hex C0) (Default - Client) |
| SSL3 | 48 (Hex 30) |
| SSL2 | 12 (Hex 0C) |

Note that only TLS 1.2 is enabled for server components that accept incoming connections. This adheres to industry standards to ensure a secure connection. Client components enable TLS 1.0, TLS 1.1, and TLS 1.2 by default and will negotiate the highest mutually supported version when connecting to a server, which should be TLS 1.2 in most cases.

**SSLEnabledProtocols: Transport Layer Security (TLS) 1.3 Notes:**

By default when TLS 1.3 is enabled, the class will first try to use the platform TLS 1.3 implementation when the [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to Automatic for all editions. If the platform TLS 1.3 implementation is not available, the internal implementation will be used.

In editions that are designed to run on Windows, [SSLProvider](#sslprovider-property-hadoopdfs-class) can be set to Platform to use the platform implementation instead of the internal implementation. When configured in this manner, please note that the platform provider is supported only on Windows 11/Windows Server 2022 and up. The default internal provider is available on all platforms and is not restricted to any specific OS version.

If set to *1* (Platform provider), please be aware of the following notes:

- The platform provider is available only on Windows 11/Windows Server 2022 and up.
- [SSLEnabledCipherSuites](#SSLEnabledCipherSuites) and other similar SSL configuration settings are not supported.
- If [SSLEnabledProtocols](#SSLEnabledProtocols) includes both TLS 1.3 and TLS 1.2, these restrictions are still applicable even if TLS 1.2 is negotiated. Enabling TLS 1.3 with the platform provider changes the implementation used for all TLS versions.

**SSLEnabledProtocols: SSL2 and SSL3 Notes: **

SSL 2.0 and 3.0 are not supported by the class when the [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to internal. To use SSL 2.0 or SSL 3.0, the platform security API must have the protocols enabled and [SSLProvider](#sslprovider-property-hadoopdfs-class) needs to be set to platform.

**SSLEnableRenegotiation**: Whether the renegotiation_info SSL extension is supported.This configuration setting specifies whether the renegotiation_info SSL extension will be used in the request when using the internal security API. This configuration setting is *false* by default, but it can be set to *true* to enable the extension.

This configuration setting is applicable only when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*.

**SSLIncludeCertChain**: Whether the entire certificate chain is included in the SSLServerAuthentication event.This configuration setting specifies whether the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-hadoopdfs-class) event contains the full certificate chain. By default this value is False and only the leaf certificate will be present in the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-hadoopdfs-class) event.

If set to True, all certificates returned by the server will be present in the Encoded parameter of the [SSLServerAuthentication](#sslserverauthentication-event-hadoopdfs-class) event. This includes the leaf certificate, any intermediate certificate, and the root certificate.

**SSLKeyLogFile**: The location of a file where per-session secrets are written for debugging purposes.This configuration setting optionally specifies the full path to a file on disk where per-session secrets are stored for debugging purposes.

When set, the class will save the session secrets in the same format as the SSLKEYLOGFILE environment variable functionality used by most major browsers and tools, such as Chrome, Firefox, and cURL. This file can then be used in tools such as Wireshark to decrypt TLS traffic for debugging purposes. When writing to this file, the class will only append, it will not overwrite previous values.

NOTE: This configuration setting is applicable only when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*.

**SSLNegotiatedCipher**: Returns the negotiated cipher suite.This configuration setting returns the cipher suite negotiated during the SSL handshake.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedCipher[connId]");
```

**SSLNegotiatedCipherStrength**: Returns the negotiated cipher suite strength.This configuration setting returns the strength of the cipher suite negotiated during the SSL handshake.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedCipherStrength[connId]");
```

**SSLNegotiatedCipherSuite**: Returns the negotiated cipher suite.This configuration setting returns the cipher suite negotiated during the SSL handshake represented as a single string.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedCipherSuite[connId]");
```

**SSLNegotiatedKeyExchange**: Returns the negotiated key exchange algorithm.This configuration setting returns the key exchange algorithm negotiated during the SSL handshake.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedKeyExchange[connId]");
```

**SSLNegotiatedKeyExchangeStrength**: Returns the negotiated key exchange algorithm strength.This configuration setting returns the strength of the key exchange algorithm negotiated during the SSL handshake.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedKeyExchangeStrength[connId]");
```

**SSLNegotiatedVersion**: Returns the negotiated protocol version.This configuration setting returns the protocol version negotiated during the SSL handshake.

NOTE: For server components (e.g., TCPServer), this is a per-connection configuration setting accessed by passing the ConnectionId. For example:

```csharp
server.Config("SSLNegotiatedVersion[connId]");
```

**SSLSecurityFlags**: Flags that control certificate verification.The following flags are defined (specified in hexadecimal notation). They can be ORed together to exclude multiple conditions:

|  |  |
| --- | --- |
| 0x00000001 | Ignore time validity status of certificate. |
| 0x00000002 | Ignore time validity status of CTL. |
| 0x00000004 | Ignore non-nested certificate times. |
| 0x00000010 | Allow unknown certificate authority. |
| 0x00000020 | Ignore wrong certificate usage. |
| 0x00000100 | Ignore unknown certificate revocation status. |
| 0x00000200 | Ignore unknown CTL signer revocation status. |
| 0x00000400 | Ignore unknown certificate authority revocation status. |
| 0x00000800 | Ignore unknown root revocation status. |
| 0x00008000 | Allow test root certificate. |
| 0x00004000 | Trust test root certificate. |
| 0x80000000 | Ignore non-matching CN (certificate CN non-matching server name). |

This functionality is currently not available when the provider is OpenSSL.

**SSLServerCACerts**: A newline separated list of CA certificates to use during SSL server certificate validation.This configuration setting is only used by client components (e.g., TCPClient) see [SSLClientCACerts](#SSLClientCACerts) for server components (e.g., TCPServer). This configuration setting can be used to optionally specify one or more CA certificates to be used when connecting to the server and verifying the server certificate. When verifying the server's certificate, the certificates trusted by the system will be used as part of the verification process. If the server's CA certificates are not installed to the trusted system store, they may be specified here so they are included when performing the verification process. This configuration setting should be set only if the server's CA certificates are not already trusted on the system and cannot be installed to the trusted system store.

The value of this configuration setting is a newline-separated (CR/LF) list of certificates. For instance:

```text
-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----
```

**TLS12SignatureAlgorithms**: Defines the allowed TLS 1.2 signature algorithms when SSLProvider is set to Internal.This configuration setting specifies the allowed server certificate signature algorithms when [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal* and [SSLEnabledProtocols](#SSLEnabledProtocols) is set to allow TLS 1.2.

When specified the class will verify that the server certificate signature algorithm is among the values specified in this configuration setting. If the server certificate signature algorithm is unsupported, the class fails with an error.

The format of this value is a comma-separated list of hash-signature combinations. For instance:

```csharp
component.SSLProvider = TCPClientSSLProviders.sslpInternal;
component.Config("SSLEnabledProtocols=3072"); //TLS 1.2
component.Config("TLS12SignatureAlgorithms=sha256-rsa,sha256-dsa,sha1-rsa,sha1-dsa");
```

 The default value for this configuration setting is *sha512-ecdsa,sha512-rsa,sha512-dsa,sha384-ecdsa,sha384-rsa,sha384-dsa,sha256-ecdsa,sha256-rsa,sha256-dsa,sha224-ecdsa,sha224-rsa,sha224-dsa,sha1-ecdsa,sha1-rsa,sha1-dsa*.

To not restrict the server's certificate signature algorithm, specify an empty string as the value for this configuration setting, which will cause the signature_algorithms TLS 1.2 extension to not be sent.

**TLS12SupportedGroups**: The supported groups for ECC.This configuration setting specifies a comma-separated list of named groups used in TLS 1.2 for ECC.

The default value is *ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1*.

When using TLS 1.2 and [SSLProvider](#sslprovider-property-hadoopdfs-class) is set to *Internal*, the values refer to the supported groups for ECC. The following values are supported:

- "ecdhe_secp256r1" (default)
- "ecdhe_secp384r1" (default)
- "ecdhe_secp521r1" (default)

**TLS13KeyShareGroups**: The groups for which to pregenerate key shares.This configuration setting specifies a comma-separated list of named groups used in TLS 1.3 for key exchange. The groups specified here will have key share data pregenerated locally before establishing a connection. This can prevent an additional roundtrip during the handshake if the group is supported by the server.

The default value is set to balance common supported groups and the computational resources required to generate key shares. As a result, only some groups are included by default in this configuration setting.

NOTE: All supported groups can always be used during the handshake even if not listed here, but if a group is used that is not present in this list, it will incur an additional roundtrip and time to generate the key share for that group.

In most cases, this configuration setting does not need to be modified. This should be modified only if there is a specific reason to do so.

The default value is *ecdhe_x25519,ecdhe_secp256r1,ecdhe_secp384r1,ffdhe_2048,ffdhe_3072*

The values are ordered from most preferred to least preferred. The following values are supported:

- "ecdhe_x25519" (default)
- "ecdhe_x448"
- "ecdhe_secp256r1" (default)
- "ecdhe_secp384r1" (default)
- "ecdhe_secp521r1"
- "ffdhe_2048" (default)
- "ffdhe_3072" (default)
- "ffdhe_4096"
- "ffdhe_6144"
- "ffdhe_8192"

**TLS13SignatureAlgorithms**: The allowed certificate signature algorithms.This configuration setting holds a comma-separated list of allowed signature algorithms. Possible values include the following:

- "ed25519" (default)
- "ed448" (default)
- "ecdsa_secp256r1_sha256" (default)
- "ecdsa_secp384r1_sha384" (default)
- "ecdsa_secp521r1_sha512" (default)
- "rsa_pkcs1_sha256" (default)
- "rsa_pkcs1_sha384" (default)
- "rsa_pkcs1_sha512" (default)
- "rsa_pss_sha256" (default)
- "rsa_pss_sha384" (default)
- "rsa_pss_sha512" (default)

 The default value is *rsa_pss_sha256,rsa_pss_sha384,rsa_pss_sha512,rsa_pkcs1_sha256,rsa_pkcs1_sha384,rsa_pkcs1_sha512,ecdsa_secp256r1_sha256,ecdsa_secp384r1_sha384,ecdsa_secp521r1_sha512,ed25519,ed448*. This configuration setting is applicable only when [SSLEnabledProtocols](#SSLEnabledProtocols) includes TLS 1.3.

**TLS13SupportedGroups**: The supported groups for (EC)DHE key exchange.This configuration setting specifies a comma-separated list of named groups used in TLS 1.3 for key exchange. This configuration setting should be modified only if there is a specific reason to do so.

The default value is *ecdhe_x25519,ecdhe_x448,ecdhe_secp256r1,ecdhe_secp384r1,ecdhe_secp521r1,ffdhe_2048,ffdhe_3072,ffdhe_4096,ffdhe_6144,ffdhe_8192,mlkem_512,mlkem_768,mlkem_1024,x25519_mlkem_768,secp256r1_mlkem_768*

The values are ordered from most preferred to least preferred. The following values are supported:

- "ecdhe_x25519" (default)
- "ecdhe_x448" (default)
- "ecdhe_secp256r1" (default)
- "ecdhe_secp384r1" (default)
- "ecdhe_secp521r1" (default)
- "ffdhe_2048" (default)
- "ffdhe_3072" (default)
- "ffdhe_4096" (default)
- "ffdhe_6144" (default)
- "ffdhe_8192" (default)
- "mlkem_512" (default)
- "mlkem_768" (default)
- "mlkem_1024" (default)
- "x25519_mlkem_768" (default)
- "secp256r1_mlkem_768" (default)

Post-quantum algorithms (*mlkem_512,mlkem_768,mlkem_1024,x25519_mlkem_768,secp256r1_mlkem_768*) in our components rely on the operating system's underlying cryptographic primitives. The following platforms are currently supported:

-  Windows Server 2025
-  Windows 11 24H2
-  Windows 11 25H2

### Socket Config Settings

**AbsoluteTimeout**: Determines whether timeouts are inactivity timeouts or absolute timeouts.If [AbsoluteTimeout](#AbsoluteTimeout) is set to True, any method that does not complete within [Timeout](#timeout-property-hadoopdfs-class) seconds will be aborted. By default, *AbsoluteTimeout* is False, and the timeout is an inactivity timeout.

NOTE: This option is not valid for User Datagram Protocol (UDP) ports.

**FirewallData**: Used to send extra data to the firewall.When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g., headers for custom authentication schemes).

**InBufferSize**: The size in bytes of the incoming queue of the socket.This is the size of an internal queue in the Transmission Control Protocol (TCP)/IP stack. You can increase or decrease its size depending on the amount of data that you will be receiving. In some cases, increasing the value of the *InBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the *InBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

**OutBufferSize**: The size in bytes of the outgoing queue of the socket.This is the size of an internal queue in the TCP/IP stack. You can increase or decrease its size depending on the amount of data that you will be sending. In some cases, increasing the value of the *OutBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the *OutBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

### Base Config Settings

**BuildInfo**: Information about the product's build.When queried, this setting will return a string containing information about the product's build.

**CodePage**: The system code page used for Unicode to Multibyte translations.The default code page is Unicode UTF-8 (65001).

The following is a list of valid code page identifiers:

|  |  |
| --- | --- |
| Identifier | Name |
| 037 | IBM EBCDIC - U.S./Canada |
| 437 | OEM - United States |
| 500 | IBM EBCDIC - International |
| 708 | Arabic - ASMO 708 |
| 709 | Arabic - ASMO 449+, BCON V4 |
| 710 | Arabic - Transparent Arabic |
| 720 | Arabic - Transparent ASMO |
| 737 | OEM - Greek (formerly 437G) |
| 775 | OEM - Baltic |
| 850 | OEM - Multilingual Latin I |
| 852 | OEM - Latin II |
| 855 | OEM - Cyrillic (primarily Russian) |
| 857 | OEM - Turkish |
| 858 | OEM - Multilingual Latin I + Euro symbol |
| 860 | OEM - Portuguese |
| 861 | OEM - Icelandic |
| 862 | OEM - Hebrew |
| 863 | OEM - Canadian-French |
| 864 | OEM - Arabic |
| 865 | OEM - Nordic |
| 866 | OEM - Russian |
| 869 | OEM - Modern Greek |
| 870 | IBM EBCDIC - Multilingual/ROECE (Latin-2) |
| 874 | ANSI/OEM - Thai (same as 28605, ISO 8859-15) |
| 875 | IBM EBCDIC - Modern Greek |
| 932 | ANSI/OEM - Japanese, Shift-JIS |
| 936 | ANSI/OEM - Simplified Chinese (PRC, Singapore) |
| 949 | ANSI/OEM - Korean (Unified Hangul Code) |
| 950 | ANSI/OEM - Traditional Chinese (Taiwan; Hong Kong SAR, PRC) |
| 1026 | IBM EBCDIC - Turkish (Latin-5) |
| 1047 | IBM EBCDIC - Latin 1/Open System |
| 1140 | IBM EBCDIC - U.S./Canada (037 + Euro symbol) |
| 1141 | IBM EBCDIC - Germany (20273 + Euro symbol) |
| 1142 | IBM EBCDIC - Denmark/Norway (20277 + Euro symbol) |
| 1143 | IBM EBCDIC - Finland/Sweden (20278 + Euro symbol) |
| 1144 | IBM EBCDIC - Italy (20280 + Euro symbol) |
| 1145 | IBM EBCDIC - Latin America/Spain (20284 + Euro symbol) |
| 1146 | IBM EBCDIC - United Kingdom (20285 + Euro symbol) |
| 1147 | IBM EBCDIC - France (20297 + Euro symbol) |
| 1148 | IBM EBCDIC - International (500 + Euro symbol) |
| 1149 | IBM EBCDIC - Icelandic (20871 + Euro symbol) |
| 1200 | Unicode UCS-2 Little-Endian (BMP of ISO 10646) |
| 1201 | Unicode UCS-2 Big-Endian |
| 1250 | ANSI - Central European |
| 1251 | ANSI - Cyrillic |
| 1252 | ANSI - Latin I |
| 1253 | ANSI - Greek |
| 1254 | ANSI - Turkish |
| 1255 | ANSI - Hebrew |
| 1256 | ANSI - Arabic |
| 1257 | ANSI - Baltic |
| 1258 | ANSI/OEM - Vietnamese |
| 1361 | Korean (Johab) |
| 10000 | MAC - Roman |
| 10001 | MAC - Japanese |
| 10002 | MAC - Traditional Chinese (Big5) |
| 10003 | MAC - Korean |
| 10004 | MAC - Arabic |
| 10005 | MAC - Hebrew |
| 10006 | MAC - Greek I |
| 10007 | MAC - Cyrillic |
| 10008 | MAC - Simplified Chinese (GB 2312) |
| 10010 | MAC - Romania |
| 10017 | MAC - Ukraine |
| 10021 | MAC - Thai |
| 10029 | MAC - Latin II |
| 10079 | MAC - Icelandic |
| 10081 | MAC - Turkish |
| 10082 | MAC - Croatia |
| 12000 | Unicode UCS-4 Little-Endian |
| 12001 | Unicode UCS-4 Big-Endian |
| 20000 | CNS - Taiwan |
| 20001 | TCA - Taiwan |
| 20002 | Eten - Taiwan |
| 20003 | IBM5550 - Taiwan |
| 20004 | TeleText - Taiwan |
| 20005 | Wang - Taiwan |
| 20105 | IA5 IRV International Alphabet No. 5 (7-bit) |
| 20106 | IA5 German (7-bit) |
| 20107 | IA5 Swedish (7-bit) |
| 20108 | IA5 Norwegian (7-bit) |
| 20127 | US-ASCII (7-bit) |
| 20261 | T.61 |
| 20269 | ISO 6937 Non-Spacing Accent |
| 20273 | IBM EBCDIC - Germany |
| 20277 | IBM EBCDIC - Denmark/Norway |
| 20278 | IBM EBCDIC - Finland/Sweden |
| 20280 | IBM EBCDIC - Italy |
| 20284 | IBM EBCDIC - Latin America/Spain |
| 20285 | IBM EBCDIC - United Kingdom |
| 20290 | IBM EBCDIC - Japanese Katakana Extended |
| 20297 | IBM EBCDIC - France |
| 20420 | IBM EBCDIC - Arabic |
| 20423 | IBM EBCDIC - Greek |
| 20424 | IBM EBCDIC - Hebrew |
| 20833 | IBM EBCDIC - Korean Extended |
| 20838 | IBM EBCDIC - Thai |
| 20866 | Russian - KOI8-R |
| 20871 | IBM EBCDIC - Icelandic |
| 20880 | IBM EBCDIC - Cyrillic (Russian) |
| 20905 | IBM EBCDIC - Turkish |
| 20924 | IBM EBCDIC - Latin-1/Open System (1047 + Euro symbol) |
| 20932 | JIS X 0208-1990 & 0121-1990 |
| 20936 | Simplified Chinese (GB2312) |
| 21025 | IBM EBCDIC - Cyrillic (Serbian, Bulgarian) |
| 21027 | Extended Alpha Lowercase |
| 21866 | Ukrainian (KOI8-U) |
| 28591 | ISO 8859-1 Latin I |
| 28592 | ISO 8859-2 Central Europe |
| 28593 | ISO 8859-3 Latin 3 |
| 28594 | ISO 8859-4 Baltic |
| 28595 | ISO 8859-5 Cyrillic |
| 28596 | ISO 8859-6 Arabic |
| 28597 | ISO 8859-7 Greek |
| 28598 | ISO 8859-8 Hebrew |
| 28599 | ISO 8859-9 Latin 5 |
| 28605 | ISO 8859-15 Latin 9 |
| 29001 | Europa 3 |
| 38598 | ISO 8859-8 Hebrew |
| 50220 | ISO 2022 Japanese with no halfwidth Katakana |
| 50221 | ISO 2022 Japanese with halfwidth Katakana |
| 50222 | ISO 2022 Japanese JIS X 0201-1989 |
| 50225 | ISO 2022 Korean |
| 50227 | ISO 2022 Simplified Chinese |
| 50229 | ISO 2022 Traditional Chinese |
| 50930 | Japanese (Katakana) Extended |
| 50931 | US/Canada and Japanese |
| 50933 | Korean Extended and Korean |
| 50935 | Simplified Chinese Extended and Simplified Chinese |
| 50936 | Simplified Chinese |
| 50937 | US/Canada and Traditional Chinese |
| 50939 | Japanese (Latin) Extended and Japanese |
| 51932 | EUC - Japanese |
| 51936 | EUC - Simplified Chinese |
| 51949 | EUC - Korean |
| 51950 | EUC - Traditional Chinese |
| 52936 | HZ-GB2312 Simplified Chinese |
| 54936 | Windows XP: GB18030 Simplified Chinese (4 Byte) |
| 57002 | ISCII Devanagari |
| 57003 | ISCII Bengali |
| 57004 | ISCII Tamil |
| 57005 | ISCII Telugu |
| 57006 | ISCII Assamese |
| 57007 | ISCII Oriya |
| 57008 | ISCII Kannada |
| 57009 | ISCII Malayalam |
| 57010 | ISCII Gujarati |
| 57011 | ISCII Punjabi |
| 65000 | Unicode UTF-7 |
| 65001 | Unicode UTF-8 |

 The following is a list of valid code page identifiers for Mac OS only:

|  |  |
| --- | --- |
| Identifier | Name |
| 1 | ASCII |
| 2 | NEXTSTEP |
| 3 | JapaneseEUC |
| 4 | UTF8 |
| 5 | ISOLatin1 |
| 6 | Symbol |
| 7 | NonLossyASCII |
| 8 | ShiftJIS |
| 9 | ISOLatin2 |
| 10 | Unicode |
| 11 | WindowsCP1251 |
| 12 | WindowsCP1252 |
| 13 | WindowsCP1253 |
| 14 | WindowsCP1254 |
| 15 | WindowsCP1250 |
| 21 | ISO2022JP |
| 30 | MacOSRoman |
| 10 | UTF16String |
| 0x90000100 | UTF16BigEndian |
| 0x94000100 | UTF16LittleEndian |
| 0x8c000100 | UTF32String |
| 0x98000100 | UTF32BigEndian |
| 0x9c000100 | UTF32LittleEndian |
| 65536 | Proprietary |

**LicenseInfo**: Information about the current license.When queried, this setting will return a string containing information about the license this instance of a class is using. It will return the following information:

- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.

**MaskSensitiveData**: Whether sensitive data is masked in log messages.In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to *true* to mask sensitive data. The default is *true*.

**ProcessIdleEvents**: Whether the class uses its internal event loop to process events when the main thread is idle.If set to False, the class will not fire internal idle events. Set this to False to use the class in a background thread on Mac OS. By default, this setting is True.

**SelectWaitMillis**: The length of time in milliseconds the class will wait when DoEvents is called if there are no events to process.If there are no events to process when DoEvents is called, the class will wait for the amount of time specified here before returning. The default value is 20.

**UseFIPSCompliantAPI**: Tells the class whether or not to use FIPS certified APIs.When set to *true*, the class will utilize the underlying operating system's certified APIs. Java editions, regardless of OS, utilize Bouncy Castle Federal Information Processing Standards (FIPS), while all other Windows editions make use of Microsoft security libraries.

FIPS mode can be enabled by setting the *UseFIPSCompliantAPI* configuration setting to *true*. This is a static setting that applies to all instances of all classes of the toolkit within the process. It is recommended to enable or disable this setting once before the component has been used to establish a connection. Enabling FIPS while an instance of the component is active and connected may result in unexpected behavior.

For more details, please see the [FIPS 140-2 Compliance](https://www.nsoftware.com/kb/articles/fips.rst) article.

NOTE: This setting is applicable only on Windows.

NOTE: Enabling FIPS compliance requires a special license; please contact [sales@nsoftware.com](mailto:sales@nsoftware.com) for details.

**UseInternalSecurityAPI**: Whether or not to use the system security libraries or an internal implementation. When set to *false*, the class will use the system security libraries by default to perform cryptographic functions where applicable.

Setting this configuration setting to *true* tells the class to use the internal implementation instead of using the system security libraries.

 On Windows, this setting is set to *false* by default. On Linux/macOS, this setting is set to *true* by default.

 To use the system security libraries for Linux, OpenSSL support must be enabled. For more information on how to enable OpenSSL, please refer to the [OpenSSL Notes](platforms.md) section.

# Trappable Errors ([HadoopDFS](#hadoopdfs-class) Class)

## Error Handling (C++)

Call the *GetLastErrorCode()* method to obtain the last called method's result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

### Common Errors

|  |  |
| --- | --- |
| 600 | A server error occurred, and/or the class was unable to process the server's response. Please refer to the error message for more information. |
| 601 | An unsupported operation or action was attempted. |
| 602 | The [RawRequest](#RawRequest) or [RawResponse](#RawResponse) configuration setting was queried without first setting the TransferredRequest configuration setting to ON. |
| 603 | The login credentials specified were invalid. Please refer to the error message for more information. |
| 604 | An invalid remote resource identifier (i.e., a name, path, Id, etc.) was specified. |
| 605 | An invalid index was specified. |
| 606 | An upload was aborted by the user before it could finish. |
| 607 | The specified resource is a folder and cannot be downloaded. |
| 608 | A download failed because the specified [LocalFile](#localfile-property-hadoopdfs-class) already exists and [Overwrite](#overwrite-property-hadoopdfs-class) is false. |
| 609 | The class could not resume a download or upload. Please refer to the error message for more information. |
| 610 | An encrypted download could not be resumed because the [DownloadTempFile](#DownloadTempFile) configuration setting is not set. |
| 611 | An exception occurred while working with the specified [LocalFile](#localfile-property-hadoopdfs-class) (or the current value of [LocalFile](#localfile-property-hadoopdfs-class) is invalid). Please refer to the error message for more information. |
| 612 | An exception occurred while working with the specified upload or download stream. Please refer to the error message for more information. |

The class may also return one of the following error codes, which are inherited from other classes.

### HTTP Errors

|  |  |
| --- | --- |
| 118 | Firewall error. The error description contains the detailed message. |
| 143 | Busy executing current method. |
| 151 | HTTP protocol error. The error message has the server response. |
| 152 | No server specified in [URL](#url-property-hadoopdfs-class). |
| 153 | Specified URLScheme is invalid. |
| 155 | Range operation is not supported by server. |
| 156 | Invalid cookie index (out of range). |
| 301 | Interrupted. |
| 302 | Cannot open AttachedFile. |

The class may also return one of the following error codes, which are inherited from other classes.

### TCPClient Errors

|  |  |
| --- | --- |
| 100 | You cannot change the RemotePort at this time. A connection is in progress. |
| 101 | You cannot change the RemoteHost (Server) at this time. A connection is in progress. |
| 102 | The RemoteHost address is invalid (0.0.0.0). |
| 104 | Already connected. If you want to reconnect, close the current connection first. |
| 106 | You cannot change the LocalPort at this time. A connection is in progress. |
| 107 | You cannot change the [LocalHost](#localhost-property-hadoopdfs-class) at this time. A connection is in progress. |
| 112 | You cannot change [MaxLineLength](#MaxLineLength) at this time. A connection is in progress. |
| 116 | RemotePort cannot be zero. Please specify a valid service port number. |
| 117 | You cannot change the UseConnection option while the class is active. |
| 135 | Operation would block. |
| 201 | Timeout. |
| 211 | Action impossible in control's present state. |
| 212 | Action impossible while not connected. |
| 213 | Action impossible while listening. |
| 301 | Timeout. |
| 302 | Could not open file. |
| 434 | Unable to convert string to selected CodePage. |
| 1105 | Already connecting. If you want to reconnect, close the current connection first. |
| 1117 | You need to connect first. |
| 1119 | You cannot change the LocalHost at this time. A connection is in progress. |
| 1120 | Connection dropped by remote host. |

### SSL Errors

|  |  |
| --- | --- |
| 270 | Cannot load specified security library. |
| 271 | Cannot open certificate store. |
| 272 | Cannot find specified certificate. |
| 273 | Cannot acquire security credentials. |
| 274 | Cannot find certificate chain. |
| 275 | Cannot verify certificate chain. |
| 276 | Error during handshake. |
| 280 | Error verifying certificate. |
| 281 | Could not find client certificate. |
| 282 | Could not find server certificate. |
| 283 | Error encrypting data. |
| 284 | Error decrypting data. |

### TCP/IP Errors

|  |  |
| --- | --- |
| 10004 | [10004] Interrupted system call. |
| 10009 | [10009] Bad file number. |
| 10013 | [10013] Access denied. |
| 10014 | [10014] Bad address. |
| 10022 | [10022] Invalid argument. |
| 10024 | [10024] Too many open files. |
| 10035 | [10035] Operation would block. |
| 10036 | [10036] Operation now in progress. |
| 10037 | [10037] Operation already in progress. |
| 10038 | [10038] Socket operation on nonsocket. |
| 10039 | [10039] Destination address required. |
| 10040 | [10040] Message is too long. |
| 10041 | [10041] Protocol wrong type for socket. |
| 10042 | [10042] Bad protocol option. |
| 10043 | [10043] Protocol is not supported. |
| 10044 | [10044] Socket type is not supported. |
| 10045 | [10045] Operation is not supported on socket. |
| 10046 | [10046] Protocol family is not supported. |
| 10047 | [10047] Address family is not supported by protocol family. |
| 10048 | [10048] Address already in use. |
| 10049 | [10049] Cannot assign requested address. |
| 10050 | [10050] Network is down. |
| 10051 | [10051] Network is unreachable. |
| 10052 | [10052] Net dropped connection or reset. |
| 10053 | [10053] Software caused connection abort. |
| 10054 | [10054] Connection reset by peer. |
| 10055 | [10055] No buffer space available. |
| 10056 | [10056] Socket is already connected. |
| 10057 | [10057] Socket is not connected. |
| 10058 | [10058] Cannot send after socket shutdown. |
| 10059 | [10059] Too many references, cannot splice. |
| 10060 | [10060] Connection timed out. |
| 10061 | [10061] Connection refused. |
| 10062 | [10062] Too many levels of symbolic links. |
| 10063 | [10063] File name is too long. |
| 10064 | [10064] Host is down. |
| 10065 | [10065] No route to host. |
| 10066 | [10066] Directory is not empty |
| 10067 | [10067] Too many processes. |
| 10068 | [10068] Too many users. |
| 10069 | [10069] Disc Quota Exceeded. |
| 10070 | [10070] Stale NFS file handle. |
| 10071 | [10071] Too many levels of remote in path. |
| 10091 | [10091] Network subsystem is unavailable. |
| 10092 | [10092] WINSOCK DLL Version out of range. |
| 10093 | [10093] Winsock is not loaded yet. |
| 11001 | [11001] Host not found. |
| 11002 | [11002] Nonauthoritative 'Host not found' (try again or check DNS setup). |
| 11003 | [11003] Nonrecoverable errors: FORMERR, REFUSED, NOTIMP. |
| 11004 | [11004] Valid name, no data record (check DNS setup). |