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<p>This will be a quick-and-dirty guide to getting started with the BCHS stack. More information can be found at:</p>
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<li><a href="https://learnbchs.org">Learn BCHS</a></li>
<li><a href="http://man.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/pledge.2">pledge(2)</a></li>
<li><a href="http://man.openbsd.org/unveil.2">unveil(2)</a></li>
<li><a href="https://kristaps.bsd.lv/kcgi/">kcgi</a></li>
<li><a href="https://kristaps.bsd.lv/ksql/">ksql</a></li>
<li><a href="https://kristaps.bsd.lv/kwebapp">kwebapp</a></li>
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<p>tilde.institute is set up to process all files with the .cgi extension via slowcgi(8). This allows for a multitude of possibilities - any compiled language can be used to develop web applications on an OpenBSD server. It's advised to use C because of the pledge(2) and unveil(2) system calls available, which allow for restricting privileges and restricted filesystem access, respectively.</p>
<p>Keep in mind that if you don't use the previously listed kcgi/ksql/kwebapp libraries, you will need to work with HTTP's eccentricities manually. For an example, here's <a href="helloworld.c.txt">the Hello World code</a> from the LearnBCHS site. And <a href="helloworld.cgi">here it is running</a> as compiled CGI here at the Tilde Institute.</p>
<p>Once you've written your software to be served via CGI, be sure to statically link the executables. Sure, there's a larger file size, but the benefits outweigh that in this case - there's no relying on what I may or may not have installed on the Tilde Institute's server. For example:</p>
<p>$ cc -static -g -W -Wall -o app.cgi app.c</p>
<p>When you've completed compilation, make sure to set permissions properly (755) and move it to the public_html folder in your home directory. httpd(8) is set to use index.html as the index file, however this can be changed to index.cgi or what-have-you by contacting ahriman via IRC.</p>
<p>~institute user <code> xvetrd </code> has written a more detailed example on kcgi than is provided on the library's site. It includes an example makefile as well. The KCGI Starter archive <a href="kcgi-start.tar.gz">is available here</a>. Simply <code> curl -O https://tilde.institute/kcgi-start.tar.gz </code> it to your home directory here on ~institute, untar, make, and make install to test the compilation. It installs to ~/public_html with the proper ownership and permissions. View the index.c source and the makefile to see what goes on under the hood! Feel free to adapt it your own projects!</p>
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