Getting Started

As with the Bomb lab, each team will have their own target programs to use that you'll download with links on wilkes.

When you're ready, one (and only one) of your team should

Connect to wilkes over SSH.
Create a directory for you to work in; we suggest
```
mkdir -p cs105/lab05
cd cs105
ls -ld lab05
```
which should look something like
```
drwx------ 3 you students 4096 Feb  5 14:41 lab05
```
If any of the permission bits appear other than the first drwx; for example,
```
drwxr-x--x 3 you students 4096 Feb  5 14:41 lab05
```
change them so no one but you (and your partner next to you) can see your work with
```
chmod 700 lab05
ls -ld lab05
drwxr----- 3 you students 4096 Feb  5 14:41 lab05
```
Run cd lab05 to change to your lab directory, then run
```
links http://wilkes:15513
```
Follow the prompts to download your target (another tar file), and hit the Q key to exit links when you're done.

(You can also refer back to the getting started page for the Bomb lab as a refresher on using links.)

The `tar` File

You now have a tar file called targetk.tar, where k is the unique number of your target programs. Unpack it with

tar -xvf targetk.tar

and cd targetk.

You should only download one set of files. If for some reason you download multiple targets, choose one target to work on and delete the rest.

The files in targetk include

README.txt: A file describing the contents of the directory.
ctarget: An executable program vulnerable to code injection attacks.
rtarget: An executable program vulnerable to return-oriented programming attacks.
cookie.txt: An 8-digit hexadecimal code that you will use as a unique identifier in your attacks.
farm.c: The source code of your target's “gadget farm”, which you will use in generating return-oriented programming attacks.
hex2raw: A utility to generate attack strings. (See this page for details on using hex2raw.)

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