AzureRelayProxy Component

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Allows local connections to be proxied to the Azure Relay Service.

Syntax

TipqAzureRelayProxy

Remarks

The AzureRelayProxy component is designed to listen locally and forward received data over a connection to the Azure Relay Service.

This allows any TCP-based client to connect and send data to Azure Relay Service without any additional knowledge. When listening and a client connects a corresponding connection is made to the specified NamespaceAddress and data then flows freely between the connected client and the Azure Relay Service. Each new connection made to AzureRelayProxy results in a new connection made to the Azure Relay Service. Connections are not shared between clients.

The diagram below illustrates the design of this component.

                          +---------+                       +----------+
Client A <---- TCP ----> |  Azure  | <==== WebSocket ====> |  Azure   |
Client B <---- TCP ----> |  Relay  | <==== WebSocket ====> |  Relay   |
Client C <---- TCP ----> |  Proxy  | <==== WebSocket ====> |  Service |
                          +---------+                       +----------+

Authenticating and Listening

Authentication to Azure Relay is performed using the Shared Access Key Name and Shared Access Key created from the Azure portal for the Relay. To begin listening for incoming connections set Listening to True.

When set to True the component will begin listening for incoming connection. When a connection is made a corresponding connection is made to the Azure Relay Service. The following properties are required when setting Listening:

• AccessKey (required)
• AccessKeyName (required)
• HybridConnection (required)
• NamespaceAddress (required)

To use SSL for incoming connections set SSLCert to a valid certificate with private key and set SSLEnabled to True before setting Listening.

DoEvents should be called in a loop to ensure timely processing of all activity, including connection requests and data transfer.

To stop listening set Listening to False. To shutdown the server including existing connections call Shutdown.

Handling Connections

When a connection is made the ConnectionRequest event fires with information about the connecting client. From within this event the client connection may be accepted (default) or rejected.

If the client connection is accepted the Connected event fire when the connection completes and is ready to send and receive data.

Data will be proxied between the connected client and the Azure Relay Service. No special steps are required.

When the client disconnects the Disconnected event fires. To initiate the client disconnection call Disconnect.

Property List

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

Method List

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

Event List

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

Config Settings

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

AccessKey Property (AzureRelayProxy Component)

The Shared Access Key.

Syntax

__property String AccessKey = { read=FAccessKey, write=FSetAccessKey };

Default Value

""

Remarks

This property specifies the Shared Access Key to use when authenticating. This is the primary or secondary key of the shared access policy created in the Azure portal. For instance 8oKRDwkl0s440MlLUi4qHxDL34j1FS6K3t5TRoJ216c=.

Data Type

String

AccessKeyName Property (AzureRelayProxy Component)

The Shared Access Key Name.

Syntax

__property String AccessKeyName = { read=FAccessKeyName, write=FSetAccessKeyName };

Default Value

""

Remarks

This property specifies the Shared Access Key name to use when authenticating. This is the name of the shared access policy created in the Azure portal. For instance RootManageSharedAccessKey.

Data Type

String

ConnectionBacklog Property (AzureRelayProxy Component)

This property includes the maximum number of pending connections maintained by the Transmission Control Protocol (TCP)/IP subsystem.

Syntax

__property int ConnectionBacklog = { read=FConnectionBacklog, write=FSetConnectionBacklog };

Default Value

5

Remarks

This property contains the maximum number of pending connections maintained by the TCP/IP subsystem. This value reflects the SOMAXCONN option for the main listening socket. The default value for most systems is 5. You may set this property to a larger value if the server is expected to receive a large number of connections, and queuing them is desirable.

This property is not available at design time.

Data Type

Integer

AzureRelayProxyConnectionCount Property (AzureRelayProxy Component)

The number of records in the AzureRelayProxyConnection arrays.

Syntax

__property int AzureRelayProxyConnectionCount = { read=FAzureRelayProxyConnectionCount };

Default Value

0

Remarks

This property controls the size of the following arrays:

• AzureRelayProxyConnectionConnected
• AzureRelayProxyConnectionConnectionId
• AzureRelayProxyConnectionIdleTimeout
• AzureRelayProxyConnectionLocalAddress
• AzureRelayProxyConnectionRemoteHost
• AzureRelayProxyConnectionRemotePort
• AzureRelayProxyConnectionTimeout
• AzureRelayProxyConnectionUserData

The array indices start at 0 and end at AzureRelayProxyConnectionCount - 1.

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

Data Type

Integer

AzureRelayProxyConnectionConnected Property (AzureRelayProxy Component)

This property indicates the status of individual connections.

Syntax

__property bool AzureRelayProxyConnectionConnected[int ConnectionId] = { read=FAzureRelayProxyConnectionConnected };

Default Value

False

Remarks

This property indicates the status of individual connections.

When true, the connection is established. Use the Disconnect method to disconnect an existing connection.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

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

Data Type

Boolean

AzureRelayProxyConnectionConnectionId Property (AzureRelayProxy Component)

This property contains an identifier generated by the component to identify each connection.

Syntax

__property int AzureRelayProxyConnectionConnectionId[int ConnectionId] = { read=FAzureRelayProxyConnectionConnectionId };

Default Value

0

Remarks

This property contains an identifier generated by the component to identify each connection. This identifier is unique to this connection.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

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

Data Type

Integer

AzureRelayProxyConnectionIdleTimeout Property (AzureRelayProxy Component)

This property contains the idle timeout for this connection.

Syntax

__property int AzureRelayProxyConnectionIdleTimeout[int ConnectionId] = { read=FAzureRelayProxyConnectionIdleTimeout, write=FSetAzureRelayProxyConnectionIdleTimeout };

Default Value

0

Remarks

This property contains the idle timeout for this connection. This property is similar to DefaultIdleTimeout but may be set on a per-connection basis to override DefaultIdleTimeout. This property specifies the idle timeout (in seconds) for the connected client. When set to a positive value, the component will disconnect idle clients after the specified timeout.

This applies only to clients that have not sent to received data within the specified number of seconds.

If set to 0 (default), no idle timeout is applied.

Note: DoEvents must be called for the component to check existing connections.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

This property is not available at design time.

Data Type

Integer

AzureRelayProxyConnectionLocalAddress Property (AzureRelayProxy Component)

This property shows the IP address of the interface through which the connection is passing.

Syntax

__property String AzureRelayProxyConnectionLocalAddress[int ConnectionId] = { read=FAzureRelayProxyConnectionLocalAddress };

Default Value

""

Remarks

This property shows the IP address of the interface through which the connection is passing.

AzureRelayProxyConnectionLocalAddress is important for multihomed hosts so that it can be used to find the particular network interface through which an individual connection is going.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

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

Data Type

String

AzureRelayProxyConnectionRemoteHost Property (AzureRelayProxy Component)

This property shows the IP address of the remote host through which the connection is coming.

Syntax

__property String AzureRelayProxyConnectionRemoteHost[int ConnectionId] = { read=FAzureRelayProxyConnectionRemoteHost };

Default Value

""

Remarks

This property shows the IP address of the remote host through which the connection is coming.

The connection must be valid or an error will be fired.

If the component is configured to use a SOCKS firewall, the value assigned to this property may be preceded with an "*". If this is the case, the host name is passed to the firewall unresolved and the firewall performs the DNS resolution.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

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

Data Type

String

AzureRelayProxyConnectionRemotePort Property (AzureRelayProxy Component)

This property shows the Transmission Control Protocol (TCP) port on the remote host through which the connection is coming.

Syntax

__property int AzureRelayProxyConnectionRemotePort[int ConnectionId] = { read=FAzureRelayProxyConnectionRemotePort };

Default Value

0

Remarks

This property shows the Transmission Control Protocol (TCP) port on the remote host through which the connection is coming.

The connection must be valid or an error will be fired.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

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

Data Type

Integer

AzureRelayProxyConnectionTimeout Property (AzureRelayProxy Component)

This property specifies a timeout for the component.

Syntax

__property int AzureRelayProxyConnectionTimeout[int ConnectionId] = { read=FAzureRelayProxyConnectionTimeout, write=FSetAzureRelayProxyConnectionTimeout };

Default Value

0

Remarks

This property specifies a timeout for the component.

If the AzureRelayProxyConnectionTimeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If AzureRelayProxyConnectionTimeout is set to a positive value, data is sent in a blocking manner and the component will wait for the operation to complete before returning control. The component will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of AzureRelayProxyConnectionTimeout seconds.

The component 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 component raises an exception.

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 AzureRelayProxyConnectionTimeout property is 0 (asynchronous operation).

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

This property is not available at design time.

Data Type

Integer

AzureRelayProxyConnectionUserData Property (AzureRelayProxy Component)

The UserData property holds connection-specific user-specified data.

Syntax

__property String AzureRelayProxyConnectionUserData[int ConnectionId] = { read=FAzureRelayProxyConnectionUserData, write=FSetAzureRelayProxyConnectionUserData };
__property DynamicArray<Byte> AzureRelayProxyConnectionUserDataB[int ConnectionId] = { read=FAzureRelayProxyConnectionUserDataB, write=FSetAzureRelayProxyConnectionUserDataB };

Default Value

""

Remarks

The AzureRelayProxyConnectionUserData property holds connection-specific user-specified data.

User-specified data may be set or retrieved at any point while the connection is valid. This provides a simple way to associate arbitrary data with a specific connection.

The ConnectionId parameter specifies the index of the item in the array. The size of the array is controlled by the AzureRelayProxyConnectionCount property.

This property is not available at design time.

Data Type

Byte Array

DefaultIdleTimeout Property (AzureRelayProxy Component)

This property includes the default idle timeout for inactive clients.

Syntax

__property int DefaultIdleTimeout = { read=FDefaultIdleTimeout, write=FSetDefaultIdleTimeout };

Default Value

0

Remarks

This property specifies the idle timeout (in seconds) for clients. When set to a positive value, the component will disconnect idle clients after the specified timeout.

This applies only to clients that have not sent or received data within DefaultIdleTimeout seconds.

If set to 0 (default), no idle timeout is applied.

Note: DoEvents must be called for the component to check existing connections.

Data Type

Integer

DefaultTimeout Property (AzureRelayProxy Component)

This property includes an initial timeout value to be used by incoming connections.

Syntax

__property int DefaultTimeout = { read=FDefaultTimeout, write=FSetDefaultTimeout };

Default Value

0

Remarks

This property is used by the component to set the operational timeout value of all inbound connections once they are established.

By default, the timeout is 0, meaning that all inbound connections will behave asynchronously.

Data Type

Integer

HybridConnection Property (AzureRelayProxy Component)

The hybrid connection name.

Syntax

__property String HybridConnection = { read=FHybridConnection, write=FSetHybridConnection };

Default Value

""

Remarks

This setting specifies the name of the hybrid connection that was created in the Azure portal. For instance hc1.

Data Type

String

KeepAlive Property (AzureRelayProxy Component)

When True, KEEPALIVE packets are enabled (for long connections).

Syntax

__property bool KeepAlive = { read=FKeepAlive, write=FSetKeepAlive };

Default Value

False

Remarks

This property enables the SO_KEEPALIVE option on the incoming connections. This option prevents long connections from timing out in case of inactivity.

Note: System Transmission Control Protocol (TCP)/IP stack implementations are not required to support SO_KEEPALIVE.

This property is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified.

Data Type

Boolean

Linger Property (AzureRelayProxy Component)

When set to True, connections are terminated gracefully.

Syntax

__property bool Linger = { read=FLinger, write=FSetLinger };

Default Value

True

Remarks

This property controls how a connection is closed. The default is True. In this case, the connection is closed only after all the data are sent. Setting it to False forces an abrupt (hard) disconnection. Any data that were in the sending queue may be lost.

The default behavior (which is also the default mode for stream sockets) might result in an indefinite delay in closing the connection. Although the component returns control immediately, the system might indefinitely hold system resources until all pending data are sent (even after your application closes). This means that valuable system resources might be wasted.

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

This property is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified.

Data Type

Boolean

Listening Property (AzureRelayProxy Component)

This property indicates whether the component is listening for incoming connections on LocalPort.

Syntax

__property bool Listening = { read=FListening };

Default Value

False

Remarks

This property indicates whether the component is listening for connections on the port specified by the LocalPort property. Use the StartListening and StopListening methods to control whether the component is listening.

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

Data Type

Boolean

LocalHost Property (AzureRelayProxy Component)

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

Syntax

__property String LocalHost = { read=FLocalHost, write=FSetLocalHost };

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 component initiate connections (or accept in the case of server components) 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 component 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

LocalPort Property (AzureRelayProxy Component)

This property includes the Transmission Control Protocol (TCP) port in the local host where the component listens.

Syntax

__property int LocalPort = { read=FLocalPort, write=FSetLocalPort };

Default Value

0

Remarks

This property must be set before the component can start listening. If its value is 0, then the TCP/IP subsystem picks a port number at random. The port number can be found by checking the value of this property after the component is listening (i.e., after successfully assigning True to the Listening property).

The service port is not shared among servers so two components cannot be listening on the same port at the same time.

Data Type

Integer

NamespaceAddress Property (AzureRelayProxy Component)

The namespace address of the relay.

Syntax

__property String NamespaceAddress = { read=FNamespaceAddress, write=FSetNamespaceAddress };

Default Value

""

Remarks

This property specifies the full fully qualified domain name of the relay namespace. For instance myrelay.servicebus.windows.net.

Data Type

String

SSLAuthenticateClients Property (AzureRelayProxy Component)

If set to True, the server asks the client(s) for a certificate.

Syntax

__property bool SSLAuthenticateClients = { read=FSSLAuthenticateClients, write=FSetSSLAuthenticateClients };

Default Value

false

Remarks

This property is used in conjunction with the SSLClientAuthentication event. Please refer to the documentation of the SSLClientAuthentication event for details.

Data Type

Boolean

SSLCertEffectiveDate Property (AzureRelayProxy Component)

The date on which this certificate becomes valid.

Syntax

__property String SSLCertEffectiveDate = { read=FSSLCertEffectiveDate };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertExpirationDate Property (AzureRelayProxy Component)

The date on which the certificate expires.

Syntax

__property String SSLCertExpirationDate = { read=FSSLCertExpirationDate };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertExtendedKeyUsage Property (AzureRelayProxy Component)

A comma-delimited list of extended key usage identifiers.

Syntax

__property String SSLCertExtendedKeyUsage = { read=FSSLCertExtendedKeyUsage };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertFingerprint Property (AzureRelayProxy Component)

The hex-encoded, 16-byte MD5 fingerprint of the certificate.

Syntax

__property String SSLCertFingerprint = { read=FSSLCertFingerprint };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertFingerprintSHA1 Property (AzureRelayProxy Component)

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate.

Syntax

__property String SSLCertFingerprintSHA1 = { read=FSSLCertFingerprintSHA1 };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertFingerprintSHA256 Property (AzureRelayProxy Component)

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate.

Syntax

__property String SSLCertFingerprintSHA256 = { read=FSSLCertFingerprintSHA256 };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertIssuer Property (AzureRelayProxy Component)

The issuer of the certificate.

Syntax

__property String SSLCertIssuer = { read=FSSLCertIssuer };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertPrivateKey Property (AzureRelayProxy Component)

The private key of the certificate (if available).

Syntax

__property String SSLCertPrivateKey = { read=FSSLCertPrivateKey };

Default Value

""

Remarks

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

Note: The SSLCertPrivateKey may be available but not exportable. In this case, SSLCertPrivateKey returns an empty string.

This property is read-only.

Data Type

String

SSLCertPrivateKeyAvailable Property (AzureRelayProxy Component)

Whether a PrivateKey is available for the selected certificate.

Syntax

__property bool SSLCertPrivateKeyAvailable = { read=FSSLCertPrivateKeyAvailable };

Default Value

false

Remarks

Whether a SSLCertPrivateKey is available for the selected certificate. If SSLCertPrivateKeyAvailable is True, the certificate may be used for authentication purposes (e.g., server authentication).

This property is read-only.

Data Type

Boolean

SSLCertPrivateKeyContainer Property (AzureRelayProxy Component)

The name of the PrivateKey container for the certificate (if available).

Syntax

__property String SSLCertPrivateKeyContainer = { read=FSSLCertPrivateKeyContainer };

Default Value

""

Remarks

The name of the SSLCertPrivateKey container for the certificate (if available). This functionality is available only on Windows platforms.

This property is read-only.

Data Type

String

SSLCertPublicKey Property (AzureRelayProxy Component)

The public key of the certificate.

Syntax

__property String SSLCertPublicKey = { read=FSSLCertPublicKey };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertPublicKeyAlgorithm Property (AzureRelayProxy Component)

The textual description of the certificate's public key algorithm.

Syntax

__property String SSLCertPublicKeyAlgorithm = { read=FSSLCertPublicKeyAlgorithm };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertPublicKeyLength Property (AzureRelayProxy Component)

The length of the certificate's public key (in bits).

Syntax

__property int SSLCertPublicKeyLength = { read=FSSLCertPublicKeyLength };

Default Value

0

Remarks

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

This property is read-only.

Data Type

Integer

SSLCertSerialNumber Property (AzureRelayProxy Component)

The serial number of the certificate encoded as a string.

Syntax

__property String SSLCertSerialNumber = { read=FSSLCertSerialNumber };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertSignatureAlgorithm Property (AzureRelayProxy Component)

The text description of the certificate's signature algorithm.

Syntax

__property String SSLCertSignatureAlgorithm = { read=FSSLCertSignatureAlgorithm };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertStore Property (AzureRelayProxy Component)

The name of the certificate store for the client certificate.

Syntax

__property String SSLCertStore = { read=FSSLCertStore, write=FSetSSLCertStore };
__property DynamicArray<Byte> SSLCertStoreB = { read=FSSLCertStoreB, write=FSetSSLCertStoreB };

Default Value

"MY"

Remarks

The name of the certificate store for the client certificate.

The SSLCertStoreType property denotes the type of the certificate store specified by SSLCertStore. If the store is password-protected, specify the password in SSLCertStorePassword.

SSLCertStore is used in conjunction with the SSLCertSubject property to specify client certificates. If SSLCertStore has a value, and SSLCertSubject or SSLCertEncoded is set, a search for a certificate is initiated. Please see the SSLCertSubject property for details.

Designations of certificate stores are platform dependent.

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

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).

Data Type

Byte Array

SSLCertStorePassword Property (AzureRelayProxy Component)

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

Syntax

__property String SSLCertStorePassword = { read=FSSLCertStorePassword, write=FSetSSLCertStorePassword };

Default Value

""

Remarks

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

Data Type

String

SSLCertStoreType Property (AzureRelayProxy Component)

The type of certificate store for this certificate.

Syntax

__property TipqAzureRelayProxySSLCertStoreTypes SSLCertStoreType = { read=FSSLCertStoreType, write=FSetSSLCertStoreType };

enum TipqAzureRelayProxySSLCertStoreTypes {
  cstUser=0,
  cstMachine=1,
  cstPFXFile=2,
  cstPFXBlob=3,
  cstJKSFile=4,
  cstJKSBlob=5,
  cstPEMKeyFile=6,
  cstPEMKeyBlob=7,
  cstPublicKeyFile=8,
  cstPublicKeyBlob=9,
  cstSSHPublicKeyBlob=10,
  cstP7BFile=11,
  cstP7BBlob=12,
  cstSSHPublicKeyFile=13,
  cstPPKFile=14,
  cstPPKBlob=15,
  cstXMLFile=16,
  cstXMLBlob=17,
  cstJWKFile=18,
  cstJWKBlob=19,
  cstSecurityKey=20,
  cstBCFKSFile=21,
  cstBCFKSBlob=22,
  cstPKCS11=23,
  cstAuto=99
};

Default Value

cstUser

Remarks

The type of certificate store for this certificate.

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

Data Type

Integer

SSLCertSubjectAltNames Property (AzureRelayProxy Component)

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

Syntax

__property String SSLCertSubjectAltNames = { read=FSSLCertSubjectAltNames };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertThumbprintMD5 Property (AzureRelayProxy Component)

The MD5 hash of the certificate.

Syntax

__property String SSLCertThumbprintMD5 = { read=FSSLCertThumbprintMD5 };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertThumbprintSHA1 Property (AzureRelayProxy Component)

The SHA-1 hash of the certificate.

Syntax

__property String SSLCertThumbprintSHA1 = { read=FSSLCertThumbprintSHA1 };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertThumbprintSHA256 Property (AzureRelayProxy Component)

The SHA-256 hash of the certificate.

Syntax

__property String SSLCertThumbprintSHA256 = { read=FSSLCertThumbprintSHA256 };

Default Value

""

Remarks

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.

This property is read-only.

Data Type

String

SSLCertUsage Property (AzureRelayProxy Component)

The text description of UsageFlags .

Syntax

__property String SSLCertUsage = { read=FSSLCertUsage };

Default Value

""

Remarks

The text description of SSLCertUsageFlags.

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.

This property is read-only.

Data Type

String

SSLCertUsageFlags Property (AzureRelayProxy Component)

The flags that show intended use for the certificate.

Syntax

__property int SSLCertUsageFlags = { read=FSSLCertUsageFlags };

Default Value

0

Remarks

The flags that show intended use for the certificate. The value of SSLCertUsageFlags is a combination of the following flags:

Please see the SSLCertUsage property for a text representation of SSLCertUsageFlags.

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

This property is read-only.

Data Type

Integer

SSLCertVersion Property (AzureRelayProxy Component)

The certificate's version number.

Syntax

__property String SSLCertVersion = { read=FSSLCertVersion };

Default Value

""

Remarks

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

This property is read-only.

Data Type

String

SSLCertSubject Property (AzureRelayProxy Component)

The subject of the certificate used for client authentication.

Syntax

__property String SSLCertSubject = { read=FSSLCertSubject, write=FSetSSLCertSubject };

Default Value

""

Remarks

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 property 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=support@nsoftware.com". Common fields and their meanings are as follows:

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

Data Type

String

SSLCertEncoded Property (AzureRelayProxy Component)

The certificate (PEM/Base64 encoded).

Syntax

__property String SSLCertEncoded = { read=FSSLCertEncoded, write=FSetSSLCertEncoded };
__property DynamicArray<Byte> SSLCertEncodedB = { read=FSSLCertEncodedB, write=FSetSSLCertEncodedB };

Default Value

""

Remarks

The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The SSLCertStore and SSLCertSubject properties also may be used to specify a certificate.

When SSLCertEncoded is set, a search is initiated in the current SSLCertStore for the private key of the certificate. If the key is found, SSLCertSubject is updated to reflect the full subject of the selected certificate; otherwise, SSLCertSubject is set to an empty string.

This property is not available at design time.

Data Type

Byte Array

SSLEnabled Property (AzureRelayProxy Component)

This property indicates whether Transport Layer Security/Secure Sockets Layer (TLS/SSL) is enabled.

Syntax

__property bool SSLEnabled = { read=FSSLEnabled, write=FSetSSLEnabled };

Default Value

False

Remarks

This property specifies whether TLS/SSL is enabled in the component. When False (default), the component operates in plaintext mode. When True, TLS/SSL is enabled.

TLS/SSL may also be enabled by setting SSLStartMode. Setting SSLStartMode will automatically update this property value.

This property is not available at design time.

Data Type

Boolean

SSLStartMode Property (AzureRelayProxy Component)

This property determines how the component starts the Secure Sockets Layer (SSL) negotiation.

Syntax

__property TipqAzureRelayProxySSLStartModes SSLStartMode = { read=FSSLStartMode, write=FSetSSLStartMode };

enum TipqAzureRelayProxySSLStartModes {
  sslAutomatic=0,
  sslImplicit=1,
  sslExplicit=2,
  sslNone=3
};

Default Value

sslNone

Remarks

The SSLStartMode property may have one of the following values:

Data Type

Integer

Config Method (AzureRelayProxy Component)

Sets or retrieves a configuration setting.

Syntax

String __fastcall Config(String ConfigurationString);

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, 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, you must call Config("PROPERTY"). The value will be returned as a string.

Disconnect Method (AzureRelayProxy Component)

This method disconnects the specified client.

Syntax

void __fastcall Disconnect(int ConnectionId);

Remarks

Calling this method will disconnect the client specified by the ConnectionId parameter.

DoEvents Method (AzureRelayProxy Component)

This method processes events from the internal message queue.

Syntax

void __fastcall DoEvents();

Remarks

When DoEvents is called, the component processes any available events. If no events are available, it waits for a preset period of time, and then returns.

Reset Method (AzureRelayProxy Component)

This method will reset the component.

Syntax

void __fastcall Reset();

Remarks

This method will reset the component's properties to their default values.

Shutdown Method (AzureRelayProxy Component)

This method shuts down the server.

Syntax

void __fastcall Shutdown();

Remarks

This method shuts down the server. Calling this method is equivalent to calling StopListening and then breaking every client connection by calling Disconnect.

StartListening Method (AzureRelayProxy Component)

This method starts listening for incoming connections.

Syntax

void __fastcall StartListening();

Remarks

This method begins listening for incoming connections on the port specified by LocalPort. Once listening, events will fire as new clients connect and data are transferred.

To stop listening for new connections, call StopListening. To stop listening for new connections and to disconnect all existing clients, call Shutdown.

StopListening Method (AzureRelayProxy Component)

This method stops listening for new connections.

Syntax

void __fastcall StopListening();

Remarks

This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.

To stop listening and to disconnect all existing clients, call Shutdown instead.

Connected Event (AzureRelayProxy Component)

This event is fired immediately after a connection completes (or fails).

Syntax

typedef struct {
  int ConnectionId;
  int StatusCode;
  String Description;
} TipqAzureRelayProxyConnectedEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxyConnectedEvent)(System::TObject* Sender, TipqAzureRelayProxyConnectedEventParams *e);
__property TipqAzureRelayProxyConnectedEvent OnConnected = { read=FOnConnected, write=FOnConnected };

Remarks

If the connection is made normally, StatusCode is 0, and Description is "OK".

If the connection fails, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

ConnectionRequest Event (AzureRelayProxy Component)

This event is fired when a request for connection comes from a remote host.

Syntax

typedef struct {
  String Address;
  int Port;
  bool Accept;
} TipqAzureRelayProxyConnectionRequestEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxyConnectionRequestEvent)(System::TObject* Sender, TipqAzureRelayProxyConnectionRequestEventParams *e);
__property TipqAzureRelayProxyConnectionRequestEvent OnConnectionRequest = { read=FOnConnectionRequest, write=FOnConnectionRequest };

Remarks

This event indicates an incoming connection. The connection is accepted by default. Address and Port will contain information about the remote host requesting the inbound connection. If you want to refuse it, you can set the Accept parameter to False.

Disconnected Event (AzureRelayProxy Component)

This event is fired when a connection is closed.

Syntax

typedef struct {
  int ConnectionId;
  int StatusCode;
  String Description;
} TipqAzureRelayProxyDisconnectedEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxyDisconnectedEvent)(System::TObject* Sender, TipqAzureRelayProxyDisconnectedEventParams *e);
__property TipqAzureRelayProxyDisconnectedEvent OnDisconnected = { read=FOnDisconnected, write=FOnDisconnected };

Remarks

If the connection is broken normally, StatusCode is 0, and Description is "OK".

If the connection is broken for any other reason, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

Error Event (AzureRelayProxy Component)

This event fires information about errors during data delivery.

Syntax

typedef struct {
  int ConnectionId;
  int ErrorCode;
  String Description;
} TipqAzureRelayProxyErrorEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxyErrorEvent)(System::TObject* Sender, TipqAzureRelayProxyErrorEventParams *e);
__property TipqAzureRelayProxyErrorEvent OnError = { read=FOnError, write=FOnError };

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally, the component raises an exception.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ConnectionId indicates the connection for which the error is applicable.

Log Event (AzureRelayProxy Component)

This event fires once for each log message.

Syntax

typedef struct {
  int ConnectionId;
  int LogLevel;
  String Message;
  String LogType;
} TipqAzureRelayProxyLogEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxyLogEvent)(System::TObject* Sender, TipqAzureRelayProxyLogEventParams *e);
__property TipqAzureRelayProxyLogEvent OnLog = { read=FOnLog, write=FOnLog };

Remarks

This event fires once for each log message generated by the component. The verbosity is controlled by the LogLevel setting.

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

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

The value 2 (Verbose) logs additional information about the initial HTTP request.

The value 3 (Debug) logs additional debug information (if available).

Message is the log entry.

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

• "Info"
• "Error"
• "Verbose"
• "Debug"

SSLClientAuthentication Event (AzureRelayProxy Component)

This event is fired when the client presents its credentials to the server.

Syntax

typedef struct {
  int ConnectionId;
  String CertEncoded;
  DynamicArray<Byte> CertEncodedB;
  String CertSubject;
  String CertIssuer;
  String Status;
  bool Accept;
} TipqAzureRelayProxySSLClientAuthenticationEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxySSLClientAuthenticationEvent)(System::TObject* Sender, TipqAzureRelayProxySSLClientAuthenticationEventParams *e);
__property TipqAzureRelayProxySSLClientAuthenticationEvent OnSSLClientAuthentication = { read=FOnSSLClientAuthentication, write=FOnSSLClientAuthentication };

Remarks

This event enables the server to decide whether or not to continue. The Accept parameter is a recommendation on whether to continue or to 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").

SSLConnectionRequest Event (AzureRelayProxy Component)

This event fires when a Secure Sockets Layer (SSL) connection is requested.

Syntax

typedef struct {
  int ConnectionId;
  String SupportedCipherSuites;
  String SupportedSignatureAlgs;
  int CertStoreType;
  String CertStore;
  String CertPassword;
  String CertSubject;
} TipqAzureRelayProxySSLConnectionRequestEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxySSLConnectionRequestEvent)(System::TObject* Sender, TipqAzureRelayProxySSLConnectionRequestEventParams *e);
__property TipqAzureRelayProxySSLConnectionRequestEvent OnSSLConnectionRequest = { read=FOnSSLConnectionRequest, write=FOnSSLConnectionRequest };

Remarks

This event fires when an SSL connection is requested and SSLProvider is set to Internal. This event provides an opportunity to select an alternative certificate to the connecting client. This event does not fire when SSLProvider is set to Platform.

This event allows the component to be configured to use both RSA and ECDSA certificates depending on the connecting client's capabilities.

ConnectionId is the connection Id of the client requesting the connection.

SupportedCipherSuites is a comma-separated list of cipher suites that the client supports.

SupportedSignatureAlgs is a comma-separated list of certificate signature algorithms that the client supports.

CertStoreType is the store type of the alternate certificate to use for this connection. The component supports both public and private keys in a variety of formats. When the cstAuto value is used, the component will automatically determine the type. This property can take one of the following values:

CertStore is the store name or location of the alternate certificate to use for this connection.

Designations of certificate stores are platform dependent.

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

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).

CertPassword is the password of the certificate store containing the alternate certificate to use for this connection.

CertSubject is the subject of the alternate certificate to use for this connection.

The special value * matches any subject and will select the first certificate in the 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=support@nsoftware.com". Common fields and their meanings are as follows:

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

SSLStatus Event (AzureRelayProxy Component)

This event is fired to show the progress of the secure connection.

Syntax

typedef struct {
  int ConnectionId;
  String Message;
} TipqAzureRelayProxySSLStatusEventParams;
typedef void __fastcall (__closure *TipqAzureRelayProxySSLStatusEvent)(System::TObject* Sender, TipqAzureRelayProxySSLStatusEventParams *e);
__property TipqAzureRelayProxySSLStatusEvent OnSSLStatus = { read=FOnSSLStatus, write=FOnSSLStatus };

Remarks

The event is fired for informational and logging purposes only. It is used to track the progress of the connection.

Config Settings (AzureRelayProxy Component)

AzureRelayProxy Config Settings

HTTP Config Settings

TCPClient Config Settings

SSL Config Settings

-----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-----

-----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-----

-----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-----

Socket Config Settings

Trappable Errors (AzureRelayProxy Component)

AzureRelayProxy Errors