Comments (2)
⌨️ Activity: Find all ntoh*
macros
- Edit the file
5_macro_definitions.ql
- Write a query that finds the definitions of the macros named
ntohs
,ntohl
orntohll
. Use the auto-completion in the Visual Studio Code extension to guide you:- Wait a moment after typing
from
to get a list of available classes in the CodeQL standard library for C/C++. Which class in this list represents macros? Create a variable with this class as its type. - In the
where
section, type<your_variable_name>
followed by a dot.
, and wait a moment to get the list of predicates available for a value in the variable's type. Hover over each predicate to see the inline documentation. - Which predicate will give us the name of a macro?
- Use the
or
keyword to combine multiple conditions where you want at least one condition to be met. Here we are interested in three possible macro names.
- Wait a moment after typing
- You can use a regular expression to write a more compact query that searches for all three macros at once, instead of using three cases combined by
or
. Check out the predicatestring::regexpMatch
in the built-in predicates for string. CodeQL uses thejava.util.Pattern
regexp conventions). - Once you're happy with the results, submit your solution.
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Congratulations, looks like the query you introduced in 1d07550 finds the correct results!
If you created a pull request, merge it.
Let's continue to the next step.
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Related Issues (10)
- Step 1 - Welcome to the course! HOT 1
- Step 7 - Relating two variables, continued HOT 2
- Step 8 - Changing the selected output HOT 2
- Step 9 - Write your own class HOT 3
- Step 10 - Data flow and taint tracking analysis HOT 3
- Step 2 - Set up your IDE HOT 2
- Step 3 - Your first query HOT 3
- Step 4 - Anatomy of a query HOT 2
- Step 6 - Relating two variables HOT 2
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