CNT4713 Extra Credit 1

Due Sunday, 10/9

Extra Credit 1 is worth 2 points. You will create a web presence for cgi scripts and create a script that displays some HTTP request headers. You will also limit access to the cgi-bin folder.

Create a web folder for scripts

Create a web folder and cgi-bin folder on ocelot

Create a web folder on ocelot named public_html in your root folder. Change the permissions to 705.
- Change the permissions on your root folder to 701 with chmod 701 ~
- Create a subfolder of public_html named cgi-bin. Change the permission to 705.

Limit Access to `cgi-bin`

We do not want other people (like hackers) to run your scripts (over and over again).

Add a file named .htaccess to the cgi-bin folder
Set the permissions on the file to 705:
```
chmod 604 .htaccess
```
Include the following in the .htaccess file, replacing your-fiu-username with your FIU username. Be very careful with this file. If you make a mistake, you will generate a 500 error.
```
AuthType Basic
AuthName "your-fiu-username cgi-bin access"
AuthUserFile  /aul/homes/downeyt/etc/2101/registered.passwd
Require user downeyt your-fiu-username
```
Use the password that I sent the other day to access your scripts from a browser.

Create a cgi script

Save it in the cgi-bin folder.
Change its permission to 705.
Be sure the file has a .cgi extension, not .py.
The script should return a complete HTML response that displays your name and username. It should also display the HTTP request headers for Accept, Accept-Language, Query-string, User-agent and Request-Method. They are all in the operating system environment. The names in the environment are all upper case, the - is replaced with _, and some of them are prefixed with HTTP_. I recommend that you display all the keys in the environment, to see how they are spelled, then display the values you want.
Change the script to a cgi script.
The following changes to your script will allow it to be run from ocelot. Replace username with your FIU email username and script-name with the name of the script in the following URL:
```
http://ocelot.aul.fiu.edu/~username/cgi-bin/script-name.cgi
```
- Set the extension on all your scripts to .cgi
- Add this statement as the first statement in the script file:
```
#!/usr/bin/python
```
- If you do not have it, import the sys module:
```
import sys
```
- Add these statements as the first executable statements in your script. They will allow you to see any errors that are generated by your script and to see all output from your script:
```
sys.stderr = sys.stdout
print "Content-type: text/plain\n"
```

Create an Index Page in `public_html`

I want to be able to run your scripts on ocelot, without having to type the name of each script in the URL.

Create a file named index.html in the public_html folder.
Use my index page as a reference: Index Page.
you may copy the source of my page and modify it with your name and the names of your scripts.

Submitting the Assignment

To hand in the assignment, place all your scripts in the cgi-bin folder on ocelot. Zip the public_html folder, including the cgi-bin folder. DO NOT USE 7-ZIP or RAR!!!

Please use the following command to your public_html folder.
zip -r ~/username ~/public_html -x \*.zip
Replacing username with your user name. This will create a file named username.zip.
Check the size of the ZIP file, it should be less than 3 MB. If it is not, then you probably have another ZIP file stored in the ZIP archive. Delete it and re-zip.
You then have a choice for submitting the file.
- If you are logged onto ocelot, use my uploading program to upload the file. Enter this command at the command prompt:
  ~downeyt/cs/public/webftp/webftp.pl
- If you are using winscp, then download the zip file to your computer; then, upload the file to me: Submitting homework on-line via the Web.
Upload the file as binary.