SExec Module

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The SExec module is used to remotely execute a command on an SSH server.

Syntax

IPWorksSSH.Sexec

Remarks

The SExec class establishes a Secure Shell (SSH) connection to a server and starts up the user's default shell. Using the class is very simple. The destination is specified by the SSHHost property, and the login information is given by the SSHUser and SSHPassword properties. To execute the command, simply call the Execute command or set the Command property with the command you wish to execute as the parameter. Further input can be supplied to the Text parameter of the Send method or via the Stdin property.

The output of the command is returned through the Stdout event. If an error happens on the protocol level, the error message can be found in the ErrorMessage property. Errors during command execution (the stderr stream) are given by the Stderr event. Once the remote command or application terminates, the class will disconnect from the server. If the application's exit status is non-zero (success), the class will throw an exception.

Property List

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

Method List

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

Event List

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

Config Settings

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

Command Property (SExec Module)

The command to be sent to the remote host.

Syntax

• Swift
• Objective-C

public var command: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=command,setter=setCommand:) NSString* command;

- (NSString*)command;
- (void)setCommand :(NSString*)newCommand;

Default Value

""

Remarks

Assigning a command to this property makes the class attempt to connect to the SSHHost and execute the command under the user's shell. There is no need to append an end-of-line character to the command. All output from the remote application will be returned through the Stdout event.

Note: the class will terminate the connection once the remote application has finished executing. If the exit status of the application is non-zero (failure), the class will raise an exception.

Connected Property (SExec Module)

This shows whether the module is connected.

Syntax

• Swift
• Objective-C

public var connected: Bool {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=connected,setter=setConnected:) BOOL connected;

- (BOOL)connected;
- (void)setConnected :(BOOL)newConnected;

Default Value

False

Remarks

This property is used to determine whether or not the class is connected to the remote host.

Note: It is recommended to use the Connect or Disconnect method instead of setting this property.

ErrorMessage Property (SExec Module)

The error message returned by the server along with the ExitStatus .

Syntax

• Swift
• Objective-C

public var errorMessage: String {
  get {...}
}

@property (nonatomic,readonly,assign,getter=errorMessage) NSString* errorMessage;

- (NSString*)errorMessage;

Default Value

""

Remarks

After executing a command through Execute or by setting Command, the server will send a notification containing the ExitStatus of the command. The server may also send a textual representation of that code, which will be stored in ErrorMessage.

This property is read-only.

ExitStatus Property (SExec Module)

The exit code for the last executed command.

Syntax

• Swift
• Objective-C

public var exitStatus: Int32 {
  get {...}
}

@property (nonatomic,readonly,assign,getter=exitStatus) int exitStatus;

- (int)exitStatus;

Default Value

0

Remarks

After executing a command through Execute or by setting Command, the server will send a notification containing the ExitStatus of the command. The server may also send a textual representation of that code, which will be stored in ErrorMessage.

This property is read-only.

Firewall Property (SExec Module)

A set of properties related to firewall access.

Syntax

• Swift
• Objective-C

public var firewall: Firewall {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=firewallAutoDetect,setter=setFirewallAutoDetect:) BOOL firewallAutoDetect;

- (BOOL)firewallAutoDetect;
- (void)setFirewallAutoDetect :(BOOL)newFirewallAutoDetect;

@property (nonatomic,readwrite,assign,getter=firewallType,setter=setFirewallType:) int firewallType;

- (int)firewallType;
- (void)setFirewallType :(int)newFirewallType;

@property (nonatomic,readwrite,assign,getter=firewallHost,setter=setFirewallHost:) NSString* firewallHost;

- (NSString*)firewallHost;
- (void)setFirewallHost :(NSString*)newFirewallHost;

@property (nonatomic,readwrite,assign,getter=firewallPassword,setter=setFirewallPassword:) NSString* firewallPassword;

- (NSString*)firewallPassword;
- (void)setFirewallPassword :(NSString*)newFirewallPassword;

@property (nonatomic,readwrite,assign,getter=firewallPort,setter=setFirewallPort:) int firewallPort;

- (int)firewallPort;
- (void)setFirewallPort :(int)newFirewallPort;

@property (nonatomic,readwrite,assign,getter=firewallUser,setter=setFirewallUser:) NSString* firewallUser;

- (NSString*)firewallUser;
- (void)setFirewallUser :(NSString*)newFirewallUser;

 

Default Value

60

Remarks

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

LocalHost Property (SExec Module)

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

Syntax

• Swift
• Objective-C

public var localHost: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=localHost,setter=setLocalHost:) NSString* localHost;

- (NSString*)localHost;
- (void)setLocalHost :(NSString*)newLocalHost;

Default Value

""

Remarks

The LocalHost 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 multi-homed 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 classs) only through that interface.

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 multi-homed 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.

LocalPort Property (SExec Module)

The TCP port in the local host where the module binds.

Syntax

• Swift
• Objective-C

public var localPort: Int32 {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=localPort,setter=setLocalPort:) int localPort;

- (int)localPort;
- (void)setLocalPort :(int)newLocalPort;

Default Value

0

Remarks

This property 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 property to 0 (default) enables the system to choose an open port at random. The chosen port will be returned by the LocalPort property after the connection is established.

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

This property is useful when trying to connect to services that require a trusted port in the client side.

SSHAcceptServerHostKeyEncoded Property (SExec Module)

This is the certificate (PEM/Base64 encoded).

Syntax

• Swift
• Objective-C

public var sshAcceptServerHostKeyEncoded: String {
  get {...}
  set {...}
}

public var sshAcceptServerHostKeyEncodedB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHAcceptServerHostKeyEncoded,setter=setSSHAcceptServerHostKeyEncoded:) NSString* SSHAcceptServerHostKeyEncoded;

- (NSString*)SSHAcceptServerHostKeyEncoded;
- (void)setSSHAcceptServerHostKeyEncoded :(NSString*)newSSHAcceptServerHostKeyEncoded;

@property (nonatomic,readwrite,assign,getter=SSHAcceptServerHostKeyEncodedB,setter=setSSHAcceptServerHostKeyEncodedB:) NSData* SSHAcceptServerHostKeyEncodedB;

- (NSData*)SSHAcceptServerHostKeyEncodedB;
- (void)setSSHAcceptServerHostKeyEncodedB :(NSData*)newSSHAcceptServerHostKeyEncoded;

Default Value

""

Remarks

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

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

If an error occurs when setting this property an error will not be thrown. This property has a related method which will throw an error:

public func setSSHAcceptServerHostKeyEncodedB(sshAcceptServerHostKeyEncoded: Data) throws
public func setSSHAcceptServerHostKeyEncoded(sshAcceptServerHostKeyEncoded: String) throws

SSHAuthMode Property (SExec Module)

The authentication method to be used the module when calling SSHLogon .

Syntax

• Swift
• Objective-C

public var sshAuthMode: SexecSSHAuthModes {
  get {...}
  set {...}
}

public enum SexecSSHAuthModes: Int32 {
  case amNone = 0
  case amMultiFactor = 1
  case amPassword = 2
  case amPublicKey = 3
  case amKeyboardInteractive = 4
  case amGSSAPIWithMic = 5
  case amCustom = 6
  case amGSSAPIKeyex = 7
}

@property (nonatomic,readwrite,assign,getter=SSHAuthMode,setter=setSSHAuthMode:) int SSHAuthMode;

- (int)SSHAuthMode;
- (void)setSSHAuthMode :(int)newSSHAuthMode;

Default Value

2

Remarks

The SSH Authentication specification (RFC 4252) specifies multiple methods by which a user can be authenticated by an SSH server. When a call is made to SSHLogon, the class will connect to the SSH server and establish the security layer. After the connection has been secured, the client will send an authentication request to the SSHHost containing the SSHUser. The server will respond containing a list of methods by which that user may be authenticated.

The class will attempt to authenticate the user by one of those methods based on the value of SSHAuthMode and other property values supplied by the user. Currently, the class supports the following authentication methods:

Example (User/Password Auth): Control.SSHAuthMode = SftpSSHAuthModes.amPassword Control.SSHUser = "username" Control.SSHPassword = "password" Control.SSHLogon("server", 22) Example (Public Key Auth): Control.SSHAuthMode = SftpSSHAuthModes.amPublicKey Control.SSHUser = "username" Control.SSHCertStoreType = SSHCertStoreTypes.cstPFXFile; Control.SSHCertStore = "cert.pfx"; Control.SSHCertStorePassword = "certpassword"; Control.SSHCertSubject = "*"; Control.SSHLogon("server", 22)

SSHCertEncoded Property (SExec Module)

This is the certificate (PEM/Base64 encoded).

Syntax

• Swift
• Objective-C

public var sshCertEncoded: String {
  get {...}
  set {...}
}

public var sshCertEncodedB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHCertEncoded,setter=setSSHCertEncoded:) NSString* SSHCertEncoded;

- (NSString*)SSHCertEncoded;
- (void)setSSHCertEncoded :(NSString*)newSSHCertEncoded;

@property (nonatomic,readwrite,assign,getter=SSHCertEncodedB,setter=setSSHCertEncodedB:) NSData* SSHCertEncodedB;

- (NSData*)SSHCertEncodedB;
- (void)setSSHCertEncodedB :(NSData*)newSSHCertEncoded;

Default Value

""

Remarks

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

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

If an error occurs when setting this property an error will not be thrown. This property has a related method which will throw an error:

public func setSSHCertEncodedB(sshCertEncoded: Data) throws
public func setSSHCertEncoded(sshCertEncoded: String) throws

SSHCertStore Property (SExec Module)

This is the name of the certificate store for the client certificate.

Syntax

• Swift
• Objective-C

public var sshCertStore: String {
  get {...}
  set {...}
}

public var sshCertStoreB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHCertStore,setter=setSSHCertStore:) NSString* SSHCertStore;

- (NSString*)SSHCertStore;
- (void)setSSHCertStore :(NSString*)newSSHCertStore;

@property (nonatomic,readwrite,assign,getter=SSHCertStoreB,setter=setSSHCertStoreB:) NSData* SSHCertStoreB;

- (NSData*)SSHCertStoreB;
- (void)setSSHCertStoreB :(NSData*)newSSHCertStore;

Default Value

"MY"

Remarks

This is the name of the certificate store for the client certificate.

The SSHCertStoreType property denotes the type of the certificate store specified by SSHCertStore. If the store is password protected, specify the password in SSHCertStorePassword.

SSHCertStore is used in conjunction with the SSHCertSubject property to specify client certificates. If SSHCertStore has a value, and SSHCertSubject or SSHCertEncoded is set, a search for a certificate is initiated. Please see the SSHCertSubject 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 PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

SSHCertStorePassword Property (SExec Module)

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

Syntax

• Swift
• Objective-C

public var sshCertStorePassword: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHCertStorePassword,setter=setSSHCertStorePassword:) NSString* SSHCertStorePassword;

- (NSString*)SSHCertStorePassword;
- (void)setSSHCertStorePassword :(NSString*)newSSHCertStorePassword;

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.

SSHCertStoreType Property (SExec Module)

This is the type of certificate store for this certificate.

Syntax

• Swift
• Objective-C

public var sshCertStoreType: SexecSSHCertStoreTypes {
  get {...}
  set {...}
}

public enum SexecSSHCertStoreTypes: Int32 {
  case cstUser = 0
  case cstMachine = 1
  case cstPFXFile = 2
  case cstPFXBlob = 3
  case cstJKSFile = 4
  case cstJKSBlob = 5
  case cstPEMKeyFile = 6
  case cstPEMKeyBlob = 7
  case cstPublicKeyFile = 8
  case cstPublicKeyBlob = 9
  case cstSSHPublicKeyBlob = 10
  case cstP7BFile = 11
  case cstP7BBlob = 12
  case cstSSHPublicKeyFile = 13
  case cstPPKFile = 14
  case cstPPKBlob = 15
  case cstXMLFile = 16
  case cstXMLBlob = 17
  case cstJWKFile = 18
  case cstJWKBlob = 19
  case cstSecurityKey = 20
  case cstBCFKSFile = 21
  case cstBCFKSBlob = 22
  case cstPKCS11 = 23
  case cstAuto = 99
}

@property (nonatomic,readwrite,assign,getter=SSHCertStoreType,setter=setSSHCertStoreType:) int SSHCertStoreType;

- (int)SSHCertStoreType;
- (void)setSSHCertStoreType :(int)newSSHCertStoreType;

Default Value

0

Remarks

This is 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 property can take one of the following values:

SSHCertSubject Property (SExec Module)

This is the subject of the certificate used for client authentication.

Syntax

• Swift
• Objective-C

public var sshCertSubject: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHCertSubject,setter=setSSHCertSubject:) NSString* SSHCertSubject;

- (NSString*)SSHCertSubject;
- (void)setSSHCertSubject :(NSString*)newSSHCertSubject;

Default Value

""

Remarks

This is 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.

If an error occurs when setting this property an error will not be thrown. This property has a related method which will throw an error:

public func setSSHCertSubject(sshCertSubject: String) throws

SSHCompressionAlgorithms Property (SExec Module)

A comma-separated list containing all allowable compression algorithms.

Syntax

• Swift
• Objective-C

public var sshCompressionAlgorithms: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHCompressionAlgorithms,setter=setSSHCompressionAlgorithms:) NSString* SSHCompressionAlgorithms;

- (NSString*)SSHCompressionAlgorithms;
- (void)setSSHCompressionAlgorithms :(NSString*)newSSHCompressionAlgorithms;

Default Value

"none,zlib"

Remarks

During the SSH handshake, this list will be used to negotiate the compression algorithm to be used between the client and server. This list is used for both directions: client to server and server to client. When negotiating algorithms, each side sends a list of all algorithms it supports or allows. The algorithm chosen for each direction is the first algorithm to appear in the sender's list that the receiver supports, so it is important to list multiple algorithms in preferential order. If no algorithm can be agreed upon, the class will raise an error and the connection will be aborted.

At least one supported algorithm must appear in this list. The following compression algorithms are supported by the class:

• zlib
• zlib@openssh.com
• none

SSHEncryptionAlgorithms Property (SExec Module)

A comma-separated list containing all allowable encryption algorithms.

Syntax

• Swift
• Objective-C

public var sshEncryptionAlgorithms: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHEncryptionAlgorithms,setter=setSSHEncryptionAlgorithms:) NSString* SSHEncryptionAlgorithms;

- (NSString*)SSHEncryptionAlgorithms;
- (void)setSSHEncryptionAlgorithms :(NSString*)newSSHEncryptionAlgorithms;

Default Value

"aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,arcfour256,arcfour128,arcfour,cast128-cbc,aes256-gcm@openssh.com,aes128-gcm@openssh.com,chacha20-poly1305@openssh.com"

Remarks

During the SSH handshake, this list will be used to negotiate the encryption algorithm to be used between the client and server. This list is used for both directions: client to server and server to client. When negotiating algorithms, each side sends a list of all algorithms it supports or allows. The algorithm chosen for each direction is the first algorithm to appear in the sender's list that the receiver supports, so it is important to list multiple algorithms in preferential order. If no algorithm can be agreed upon, the class will raise an error and the connection will be aborted.

At least one supported algorithm must appear in this list. The following encryption algorithms are supported by the class:

SSHHost Property (SExec Module)

The address of the SSH host.

Syntax

• Swift
• Objective-C

public var sshHost: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHHost,setter=setSSHHost:) NSString* SSHHost;

- (NSString*)SSHHost;
- (void)setSSHHost :(NSString*)newSSHHost;

Default Value

""

Remarks

The SSHHost property specifies the IP address (IP number in dotted internet format) or Domain Name of the remote host. It is set before a connection is attempted and cannot be changed once a connection is established.

If the SSHHost property is set to a Domain Name, a DNS request is initiated, and upon successful termination of the request, the SSHHost property is set to the corresponding address. If the search is not successful, an error is returned.

The SSHHost must be the same host that will be assumed for SSH as for the remote service being connected to.

SSHPassword Property (SExec Module)

The password for SSH password-based authentication.

Syntax

• Swift
• Objective-C

public var sshPassword: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHPassword,setter=setSSHPassword:) NSString* SSHPassword;

- (NSString*)SSHPassword;
- (void)setSSHPassword :(NSString*)newSSHPassword;

Default Value

""

Remarks

SSHPassword specifies the password which is used to authenticate the client to the SSH server.

SSHPort Property (SExec Module)

The port on the SSH server where the SSH service is running; by default, 22.

Syntax

• Swift
• Objective-C

public var sshPort: Int32 {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHPort,setter=setSSHPort:) int SSHPort;

- (int)SSHPort;
- (void)setSSHPort :(int)newSSHPort;

Default Value

22

Remarks

The SSHPort specifies a service port on the SSH host to connect to.

A valid port number (a value between 1 and 65535) is required for the connection to take place. The property must be set before a connection is attempted and cannot be changed once a connection is established. Any attempt to change this property while connected will fail with an error.

SSHUser Property (SExec Module)

The username for SSH authentication.

Syntax

• Swift
• Objective-C

public var sshUser: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=SSHUser,setter=setSSHUser:) NSString* SSHUser;

- (NSString*)SSHUser;
- (void)setSSHUser :(NSString*)newSSHUser;

Default Value

""

Remarks

SSHUser specifies the username which is used to authenticate the client to the SSH server. This property is required.

Example (User/Password Auth): Control.SSHAuthMode = SftpSSHAuthModes.amPassword Control.SSHUser = "username" Control.SSHPassword = "password" Control.SSHLogon("server", 22) Example (Public Key Auth): Control.SSHAuthMode = SftpSSHAuthModes.amPublicKey Control.SSHUser = "username" Control.SSHCertStoreType = SSHCertStoreTypes.cstPFXFile; Control.SSHCertStore = "cert.pfx"; Control.SSHCertStorePassword = "certpassword"; Control.SSHCertSubject = "*"; Control.SSHLogon("server", 22)

Stdin Property (SExec Module)

This property includes a string of data to be sent to the remote host while connected.

Syntax

• Swift
• Objective-C

public var stdin_: String {  set {...}
}

public var stdin_B: Data {  set {...}
}

@property (nonatomic,readwrite,assign,getter=stdin,setter=setStdin:) NSString* stdin;

- (NSString*)stdin;
- (NSString*)stdin_;
- (void)setStdin :(NSString*)newStdin;
- (void)setStdin_ :(NSString*)newStdin;

@property (nonatomic,readwrite,assign,getter=stdinB,setter=setStdinB:) NSData* stdinB;

- (NSData*)stdinB;
- (void)setStdinB :(NSData*)newStdin;

Default Value

""

Remarks

This property is used to provide input for the process in the remote host.

If you are sending data to the remote host faster than it can process it, or faster than the network bandwidth allows, the outgoing queue might fill up. When this happens, Stdin .

This property is write-only.

Timeout Property (SExec Module)

A timeout for the module.

Syntax

• Swift
• Objective-C

public var timeout: Int32 {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=timeout,setter=setTimeout:) int timeout;

- (int)timeout;
- (void)setTimeout :(int)newTimeout;

Default Value

60

Remarks

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

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

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 .

Please note that by default, all timeouts are inactivity timeouts, i.e. 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.

Config Method (SExec Module)

Sets or retrieves a configuration setting.

Syntax

• Swift
• Objective-C

public func config(configurationString: String) throws -> String

- (NSString*)config:(NSString*)configurationString;

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings 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, you must call Config("PROPERTY"). The value will be returned as a string.

DecodePacket Method (SExec Module)

Decodes a hex-encoded SSH packet.

Syntax

• Swift
• Objective-C

public func decodePacket(encodedPacket: String) throws -> Data

- (NSData*)decodePacket:(NSString*)encodedPacket;

Remarks

This method is used to decode an SSH packet created by EncodePacket.

Note: This method is only applicable for reading and creating SSH packets for use within the SSHCustomAuth event.

DoEvents Method (SExec Module)

Processes events from the internal message queue.

Syntax

• Swift
• Objective-C

public func doEvents() throws -> Void

- (void)doEvents;

Remarks

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

EncodePacket Method (SExec Module)

Hex encodes an SSH packet.

Syntax

• Swift
• Objective-C

public func encodePacket(packet: Data) throws -> String

- (NSString*)encodePacket:(NSData*)packet;

Remarks

This method is used to encode a raw SSH packet created by SetSSHParam.

Note: This method is only applicable for reading and creating SSH packets for use within the SSHCustomAuth event.

Execute Method (SExec Module)

Execute a Command on the remote host.

Syntax

• Swift
• Objective-C

public func execute(command: String) throws -> Void

- (void)execute:(NSString*)command;

Remarks

Calling this method is equivalent to setting the Command property to Command.

GetSSHParam Method (SExec Module)

Used to read a field from an SSH packet's payload.

Syntax

• Swift
• Objective-C

public func getSSHParam(payload: Data, field: String) throws -> String

- (NSString*)getSSHParam:(NSData*)payload :(NSString*)field;

Remarks

This method is used to read the value of a particular field from an SSH packet's payload. Payload should contain the full payload of a packet received by an event such as SSHChannelRequest. Field is the name of a field to be read out of the packet.

The following is a list of the names of well-known channel request field names and their encodings:

The remaining fields that are available in the payload are dependent upon the value of RequestType.

pty-req

Pty-req is a request to open a pseudo terminal on the specified channel. The following fields are available:

x11-req

X11-req is a request to forward x11 sessions over a channel. The following fields are available:

env

Env is a request to set an environment variable to be passed into a shell that may be started later. The following fields are available:

exec

Exec is a request to execute a command on the channel using the authenticated user's shell. The following field is available:

subsystem

Subsystem is a request to start a subsystem on the specified channel. The following field is available:

xon-xoff

Instructs the server to allow or disallow control-S/control-Q style flow control. The following field is available:

signal

Sends a signal to the remote process/service. The following field is available:

If the packet type is not well known, Field should start with the special character "%" and contain a comma-separated list of field types as defined in SetSSHParam. For example, reading out the X11AuthProtocol of an x11-req payload, you can use "%s,f".

Note: the return value is a string encoded the same way as the FieldValue param in SetSSHParam.

Note: This method is only applicable for reading and creating SSH packets for use within the SSHCustomAuth event.

GetSSHParamBytes Method (SExec Module)

Used to read a field from an SSH packet's payload.

Syntax

• Swift
• Objective-C

public func getSSHParamBytes(payload: Data, field: String) throws -> Data

- (NSData*)getSSHParamBytes:(NSData*)payload :(NSString*)field;

Remarks

This method is the same as calling GetSSHParam, but returns raw bytes instead of strings.

Note: This method is only applicable for reading and creating SSH packets for use within the SSHCustomAuth event.

Interrupt Method (SExec Module)

Interrupt the current method.

Syntax

• Swift
• Objective-C

public func interrupt() throws -> Void

- (void)interrupt;

Remarks

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

Reset Method (SExec Module)

Reset the component.

Syntax

• Swift
• Objective-C

public func reset() throws -> Void

- (void)reset;

Remarks

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

Send Method (SExec Module)

Send standard input to the program executing on the remote host.

Syntax

• Swift
• Objective-C

public func send(text: Data) throws -> Void

- (void)send:(NSData*)text;

Remarks

Calling this method is equivalent to setting the Stdin property to Text.

SendStdinBytes Method (SExec Module)

This method sends binary data to the remote host.

Syntax

• Swift
• Objective-C

public func sendStdinBytes(data: Data) throws -> Void

- (void)sendStdinBytes:(NSData*)data;

Remarks

This method sends the specified binary data to the remote host. The data provided are used as input for the process on the remote host. To send text, use the SendStdinText method instead.

If you are sending data to the remote host faster than it can process it, or faster than the network bandwidth allows, the outgoing queue might fill up. When this happens the class .

SendStdinText Method (SExec Module)

This method sends text to the remote host.

Syntax

• Swift
• Objective-C

public func sendStdinText(text: String) throws -> Void

- (void)sendStdinText:(NSString*)text;

Remarks

This method sends the specified text to the remote host. The text provided is used as an input for the process on the remote host. To send binary data, use the SendStdinBytes method instead.

If you are sending data to the remote host faster than it can process it, or faster than the network bandwidth allows, the outgoing queue might fill up. When this happens the class .

SetSSHParam Method (SExec Module)

Used to write a field to the end of a payload.

Syntax

• Swift
• Objective-C

public func setSSHParam(payload: Data, fieldType: String, fieldValue: String) throws -> Data

- (NSData*)setSSHParam:(NSData*)payload :(NSString*)fieldType :(NSString*)fieldValue;

Remarks

This method is used to build the payload portion of an SSH packet to be sent later by a call to SendSSHPacket. Payload should contain the result of a previous call to SetSSHParam. FieldType is a string defining the type of field to be written to the packet. FieldValue should be the string representation of the field to be written.

The following is a list of supported field types and a description of how FieldValue should be encoded:

Note: integer values may be encoded in hexadecimal by prefixing "0x" to the beginning of the string, otherwise the value is assumed to be base-10.

Note: This method is only applicable for reading and creating SSH packets for use within the SSHCustomAuth event.

SSHLogoff Method (SExec Module)

Logoff from the SSH server.

Syntax

• Swift
• Objective-C

public func SSHLogoff() throws -> Void

- (void)SSHLogoff;

Remarks

Logoff from the SSH server. If that fails, the connection is terminated by the local host.

SSHLogon Method (SExec Module)

Logon to the SSHHost using the current SSHUser and SSHPassword .

Syntax

• Swift
• Objective-C

public func SSHLogon(sshHost: String, sshPort: Int32) throws -> Void

- (void)SSHLogon:(NSString*)SSHHost :(int)SSHPort;

Remarks

Logon to the SSH server using the current SSHUser and SSHPassword. This will perform the SSH handshake and authentication.

Example (Logging On)

SSHClient.SSHUser = "username" SSHClient.SSHPassword = "password" SSHClient.SSHLogon("sshHost", sshPort)

Connected Event (SExec Module)

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

Syntax

• Swift
• Objective-C

func onConnected(statusCode: Int32, description: String)

- (void)onConnected:(int)statusCode :(NSString*)description;

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 Transmission Control Protocol (TCP)/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error.

Please refer to the Error Codes section for more information.

ConnectionStatus Event (SExec Module)

This event is fired to indicate changes in the connection state.

Syntax

• Swift
• Objective-C

func onConnectionStatus(connectionEvent: String, statusCode: Int32, description: String)

- (void)onConnectionStatus:(NSString*)connectionEvent :(int)statusCode :(NSString*)description;

Remarks

The ConnectionStatus event is fired when the connection state changes: for example, completion of a firewall or proxy connection or completion of a security handshake.

The ConnectionEvent parameter indicates the type of connection event. Values may include the following:

Disconnected Event (SExec Module)

This event is fired when a connection is closed.

Syntax

• Swift
• Objective-C

func onDisconnected(statusCode: Int32, description: String)

- (void)onDisconnected:(int)statusCode :(NSString*)description;

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 Transmission Control Protocol (TCP/IP) subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error.

Please refer to the Error Codes section for more information.

Error Event (SExec Module)

Fired when information is available about errors during data delivery.

Syntax

• Swift
• Objective-C

func onError(errorCode: Int32, description: String)

- (void)onError:(int)errorCode :(NSString*)description;

Remarks

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

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 section.

Log Event (SExec Module)

Fires once for each log message.

Syntax

• Swift
• Objective-C

func onLog(logLevel: Int32, message: String, logType: String)

- (void)onLog:(int)logLevel :(NSString*)message :(NSString*)logType;

Remarks

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

LogLevel indicates the detail level of the message. Possible values are:

Message is the log message.

LogType is reserved for future use.

SSHCustomAuth Event (SExec Module)

Fired when the component is doing custom authentication.

Syntax

• Swift
• Objective-C

func onSSHCustomAuth(packet: inout String)

- (void)onSSHCustomAuth:(NSString**)packet;

Remarks

SSHCustomAuth is fired during the user authentication stage of the SSH logon process if SSHAuthMode is set to amCustom. Packet contains the raw last SSH packet sent by the server, in HEX-encoded format.

The client should create a new raw SSH packet to send to the server and set Packet to the HEX-encoded representation of the packet to send.

In all cases, Packet will start with the message type field.

To read the incoming packet call DecodePacket and then use the GetSSHParam and GetSSHParamBytes methods. To create a packet use the SetSSHParam method and then call EncodePacket to obtain a HEX-encoded value and assign this to the Packet parameter.

SSHKeyboardInteractive Event (SExec Module)

Fired when the component receives a request for user input from the server.

Syntax

• Swift
• Objective-C

func onSSHKeyboardInteractive(name: String, instructions: String, prompt: String, response: inout String, echoResponse: Bool)

- (void)onSSHKeyboardInteractive:(NSString*)name :(NSString*)instructions :(NSString*)prompt :(NSString**)response :(BOOL)echoResponse;

Remarks

SSHKeyboardInteractive is fired during the user authentication stage of the SSH logon process. During authentication, the class will request a list of available authentication methods for the SSHUser. For example, if the SSHHost responds with "keyboard-interactive", the class will fire this event to allow the client application to set the password.

During authentication, the SSH server may respond with a request for the user's authentication information. Name is a server-provided value associated with the authentication method such as "CRYPTOCard Authentication". Instructions will contain specific instructions, also supplied by the server, for how the user should respond.

Along with these values, the server will also send at least one input Prompt to be displayed to and filled out by the user. Response should be set to the user's input, and will be sent back in the user authentication information response. EchoResponse is a server recommendation for whether or not the user's response should be echoed back during input.

Note: the server may send several prompts in a single packet. The class will fire the SSHKeyboardInteractive event once for each prompt.

SSHServerAuthentication Event (SExec Module)

Fired after the server presents its public key to the client.

Syntax

• Swift
• Objective-C

func onSSHServerAuthentication(hostKey: Data, fingerprint: String, keyAlgorithm: String, certSubject: String, certIssuer: String, status: String, accept: inout Bool)

- (void)onSSHServerAuthentication:(NSData*)hostKey :(NSString*)fingerprint :(NSString*)keyAlgorithm :(NSString*)certSubject :(NSString*)certIssuer :(NSString*)status :(int*)accept;

Remarks

This event is where the client can decide whether to continue with the connection process or not. If the public key is known to be a valid key for the SSH server, Accept should be set to True within the event. Otherwise, the server will not be authenticated and the connection will be broken.

Accept will be True only if either HostKey or Fingerprint is identical to the value of SSHAcceptServerHostKey.

Accept may be set to True manually to accept the server host key.

Note that SSH's security inherently relies on client verification of the host key. Ignoring the host key and always setting Accept to true is strongly discouraged, and could cause potentially serious security vulnerabilities in your application. It is recommended that clients maintain a list of known keys for each server and check HostKey against this list each time a connection is attempted.

Host Key contains the full binary text of the key, in the same format used internally by SSH.

Fingerprint holds the SHA-256 hash of HostKey in the hex-encoded form: 0a:1b:2c:3d. To configure the hash algorithm used to calculate this value see SSHFingerprintHashAlgorithm.

KeyAlgorithm identifies the host key algorithm. Supported values are:

• ssh-rsa
• ssh-dss
• rsa-sha2-256
• rsa-sha2-512
• x509v3-sign-rsa
• x509v3-sign-dss
• ecdsa-sha2-nistp256
• ecdsa-sha2-nistp384
• ecdsa-sha2-nistp521

CertSubject is the subject of the certificate. This is only applicable when KeyAlgorithm is "x509v3-sign-rsa" or "x509v3-sign-dss".

CertIssuer is the issuer of the certificate. This is only applicable when KeyAlgorithm is "x509v3-sign-rsa" or "x509v3-sign-dss".

Status is reserved for future use.

SSHStatus Event (SExec Module)

Shows the progress of the secure connection.

Syntax

• Swift
• Objective-C

func onSSHStatus(message: String)

- (void)onSSHStatus:(NSString*)message;

Remarks

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

Stderr Event (SExec Module)

Fired when data (complete lines) come in through stderr.

Syntax

• Swift
• Objective-C

func onStderr(text: Data)

- (void)onStderr:(NSData*)text;

Remarks

The Stderr event is fired every time the process on the remote host outputs a line in its error output. The incoming data is provided through the Text parameter.

Stdout Event (SExec Module)

Fired when data (complete lines) come in through stdout.

Syntax

• Swift
• Objective-C

func onStdout(text: Data)

- (void)onStdout:(NSData*)text;

Remarks

The Stdout event is fired every time the process on the remote host outputs a line in its standard output. The incoming data is provided through the Text parameter.

Firewall Type

The firewall the component will connect through.

Remarks

When connecting through a firewall, this type is used to specify different properties of the firewall, such as the firewall and the .

Fields

Constructors

public init()

Config Settings (SExec Module)

SExec Config Settings

SSHClient Config Settings

*SSH-1.99-*,*SSH-2.0-*,*SSH-2.99-*

TCPClient Config Settings

Socket Config Settings

Base Config Settings

Trappable Errors (SExec Module)

SExec Errors

SSHClient Errors

TCPClient Errors

TCP/IP Errors