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For example, if the department named 'new_product' is merged into 'development' or renamed to 'design', what should happen with the records of employees working in that department You have four possibilities to choose from With NO ACTION, you direct the DBMS to leave the employee record as it is With SET NULL and SET DEFAULT, you choose to replace the name of the updated or deleted department with NULL or the default value, respectively With CASCADE, you tell the DBMS to repeat for the referencing record what has happened with the referenced one That is, if the employee_dept column of the employee table has the ON UPDATE CASCADE constraint, you can change the department name in the department table and automatically get the same change in the employee table.

Creating a Wizard to Submit Support Tickets . . . . . . . . . . . . . . . . . . . . . . . 215 Interference Between Browser Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 URL Mismatched . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

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Variables that are used in filesystem operations, such as calls to fopen() or file_get_contents(), can be constructed and entered so that they reveal otherwise hidden system resources The chief culprit in this sort of attack is the Unix parent directory special file designation . (dot dot) The classic example of this kind of abuse is a script that highlights the source code of any file in an application, like this fragment: < php $applicationPath = '/home/www/myphp/code/'; $scriptname = $_POST['scriptname']; highlight_file( $applicationPath $scriptname ); > This script responds to a form asking a user which file to view The user s input is stored in a $_POST variable named scriptname The script constructs a fully qualified filename, and feeds it to the highlight_file() function But consider what would happen if the user were to enter a filename like ././././etc/passwd.

Great stuff! If you have the constraint ON DELETE CASCADE and remove a department from the department table, all the employee records of the employee table referencing that department will disappear This is not necessarily what you might like to happen Therefore, you should be careful when applying these constraints..

Supporting Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

The sequence of double-dotted references causes the highlight_file() function to change to the directory four levels up from /home/www/myphp/code/, which is /, and then to /etc/passwd Highlighting this file reveals information about all the users on the host, including which ones have valid shells Another example of this sort of attack might occur in a script that imports data from another URI, expecting it to be in the form of http://exampleorg/dataxml, like this fragment (which incorporates a test to protect against the double-dot attack): < php $uri = $_POST['uri']; if ( strpos( $uri, '.' ) ) exit( 'That is not a valid URI.

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