Question

How to run c programmes in browser using apache2 in ubuntu 14.04 ?

Posted September 5, 2014 6.3k views

Hi, I am basically from electronics background, but i have got interest in programing for web application, i am very new to it. Find very interesting and moreover i am enjoying it.
I installed apache2 on ubuntu, i hosted some virtual host sites with index.html files.
but i want to run c programme on browser. i went through cgi configuration for apache2, but was not successful. when i try for any /home/*/public_html/cgi-bin/ for DocumentRoot. apache2 gives DocumentRoot not found error, and get 403 and 404 error when try to access on browser. So how to run c executable file on browser using apache2 in ubuntu 14.04.

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yogasuhas
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2 answers
asb September 5, 2014

To enable cgi-bin run:

sudo a2enmod cgi
sudo service apache2 restart

Then copy your executable to the directory /usr/lib/cgi-bin/ Assuming the name of your program is hello.cgi it will now be available at http://your.ip.address/cgi-bin/hello.cgi

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  • yogasuhas September 6, 2014

    Thank you, how the configuration on apache looks like, my current one is this, but it says DocumentRoot not found.

    <VirtualHost *:80>      

        ServerAdmin webmaster@localhost

        #DocumentRoot /var/www/html

        DocumentRoot /home/suhas/public_html/cgi-bin
        <Directory /home/suhas/public_html/cgi-bin>
                AllowOverride None
                Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                Order allow,deny
                AddHandler cgi-script .cgi
                Allow from all
        </Directory>



        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined


        #Include conf-available/serve-cgi-bin.conf

</VirtualHost>

    i am getting this error. 

    * Restarting web server apache2                                                                                                                AH00112: Warning: DocumentRoot [/home/suhas/public_html/cgi-bin] does not exist
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 192.168.4.6. Set the 'ServerName' directive globally to suppress this message
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  • asb September 8, 2014

    Does the folder /home/suhas/public_html/cgi-bin actually exist? Even so, you probably don’t want that as the document root? You probably want something like:

                    DocumentRoot /home/suhas/public_html/
                ScriptAlias /cgi-bin/ /home/suhas/public_html/cgi-bin
                <Directory "/home/suhas/public_html/cgi-bin">
                        AllowOverride None
                        Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                        Require all granted
                </Directory>
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nikolaikepler January 14, 2015
[deleted]
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  • nikolaikepler January 14, 2015

    Thanks for this explanation!

    I would like to add that those modifications worked once I applied in the right file

    /etc/apache2/sites-available/000-default.conf

    After I read other tutorials I made the modifications in

    /etc/apache2/apache2.conf

    but they never worked. Also, trying mod-fcgi I applied the modifications there and in this file

    /etc/apache2/mods-available/fcgid.conf

    But it did not work either. Now cgi and fcgi are working fine because the configuration is in the right place.

    The <VirtualHost *:80> in your example hint me where to look for.

    Thanks!

    Nikolai

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