Commit 8b82e0db authored by Alexander Hirsch's avatar Alexander Hirsch

Add ex05

parent be6f473a
......@@ -11,7 +11,7 @@
| 2019-11-12 | [New Tools in a Familiar Context] | [rr15] | |
| 2019-11-19 | [New Tools in a Familiar Context (cont.)] | [rr15] | 15:15–17:00 |
| 2019-11-26 | [Class Essentials and Libraries] | [rr15] | Inday Students |
| 2019-12-03 | | [rr15] | |
| 2019-12-03 | [More of This and That] | [rr15] | |
| 2019-12-10 | | [rr15] | |
| 2020-01-07 | | [rr15] | |
| 2020-01-14 | | [rr15] | |
......@@ -23,6 +23,7 @@
[New Tools in a Familiar Context]: ex02
[New Tools in a Familiar Context (cont.)]: ex03
[Class Essentials and Libraries]: ex04
[More of This and That]: ex05
# Exercise Sheet 5 — More of This and That
*due on 3 December 2019*
## Task 1 (2 Points)
Reuse the `Person` struct and implementation from the previous exercise sheet.
Create 5 difference instances and put all of them in
- an `std::vector`;
- an `std::set`; and
- an `std::map` as key (we don't care about the value type of the map)
Observe which operators are used for insertion.
Use algorithms from the standard library, like `std::find` and `std::partition` on these containers.
Again, observe which operators are used.
## Task 2 (3 Points)
Reuse the `Person` struct and implementation from the previous exercise sheet.
Implement the necessary parts for inserting it into an `std::unordered_set`.
Explore the difference in execution time regarding insertion and lookup for the following containers:
- `std::vector`
- `std::list`
- `std::set`
- `std::unordered_set`
Prepare plots for your presentation.
## Task 3 (2 Points)
In this task you have to create a rudimentary plugin system.
You are given `plugin.hpp` which contains an interface for your plugins, as well as the function name of the constructor function and its type.
Note that the constructor function returns an `std::unique_ptr<Plugin>`.
- Create an executable which *dynamically* loads plugins, instantiates them, and executes their `run` member function
- Create two different plugins (`foo` and `bar`) showing off the plugin system
It could look like this:
$ ./main ./
Creation of first plugin
Running the first plugin
Destruction of first plugin
$ ./main ./ ./
Creation of first plugin
Creation of second plugin
Running the first plugin
Running the second plugin
Destruction of first plugin
Destruction of second plugin
*Hint:* Have a look at the related man-pages *dlopen(3)* and *dlsym(3)*.
*Hint 2:* Use `extern "C"` to have C linkage for the create function.
## Task 4 (6 Points, Bonus, There Be Dragons)
Revisit task 2 of the previous exercise sheet.
This time you are tasked with creating a library that replaces a function inside an executable — rather than one located in another shared library.
The provided program `victim.c` contains a function `func1` which outputs a string.
Your library should replace the function so a different string is printed.
There are multiple ways to approach this.
You may look into hooking frameworks if you are stuck, but do not use them blindly.
*Hint:* Have a look at [this code snippet designed for Linux x86](
*Hint 2:* You may use `-no-pie` for compiling `victim.c` or disable [ASLR]( if you have to.
## Additional Resources
- 🎥 [CppCon 2014 — *Back to the Basics! Essentials of Modern C++ Style*](
- 🎥 [CppCon 2019 — *Behind Enemy Lines - Reverse Engineering C++ in Modern Ages*](
#ifndef PLUGIN_HPP
#define PLUGIN_HPP
#include <memory>
/// Interface for plugins.
class Plugin {
virtual void run() = 0;
virtual ~Plugin(){};
/// Symbol of the plugin construtor function.
const auto PLUGIN_CONSTRUCTOR_SYMBOL = "create_plugin";
/// Type of the plugin constructor function.
using PLUGIN_CONSTRUCTOR = std::unique_ptr<Plugin> (*)();
#include <iostream>
void func1()
std::cout << "func1 is executed\n";
int main()
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