FTP Command Validation Statements

When setting up a validation statement for an FTP command, you can specify a group of alternative parameters by separating the parameters with spaces. You can also create a binary OR relationship between two parameters by separating them with a pipe character (|) in the validation statement. Surrounding parameters by square brackets ([]) indicates that those parameters are optional. Surrounding parameters with curly brackets ({}) indicates that those parameters are required.

You can create FTP command parameter validation statements to validate the syntax of a parameter received as part of an FTP communication.

Any of the parameters listed in the following table can be used in FTP command parameter validation statements.

FTP Command Parameters
If you use...	The following validation occurs...
`int`	The represented parameter must be an integer.
`number`	The represented parameter must be an integer between 1 and 255.
`char`_chars	The represented parameter must be a single character and a member of the characters specified in the _chars argument. For example, defining the command validity for `MODE` with the validation statement `char` SBC checks that the parameter for the `MODE` command comprises the character `S` (representing Stream mode), the character `B`(representing Block mode), or the character `C`(representing Compressed mode).
`date`_datefmt	If _datefmt contains `#`, the represented parameter must be a number. If _datefmt contains `C`, the represented parameter must be a character. If _datefmt contains literal strings, the represented parameter must match the literal string.
`string`	The represented parameter must be a string.
`host_port`	The represented parameter must be a valid host port specifier as defined by RFC 959, the File Transfer Protocol specification by the Network Working Group.

You can combine the syntax in the table above as needed to create parameter validation statements that correctly validate each FTP command where you need to validate traffic.

Note	When you include a complex expression in a TYPE command, surround it by spaces. Also, surround each operand within the expression by spaces. For example, type `char A \| B`, not `char A\|B`.