Ragel based parser

Posted by seerer on August 20th, 2021

The bug was in the Ragel based parser for a long time, but as the Nginx server was running in such a way it prevented the Cloudbleed bug from happening nothing everything seemed alright. However, patching the Ragel parser was proving to be difficult and was not working quickly in parsing the HTML elements. They then decided to implement a new parser which was known as cf -HTML parser. They first introduced it to make HTTP rewrites. First they implemented the two parsers as modules in Nginx. The modules were then made into Nginx builds and used in Cloudflare servers. The Nginx modules are made to access HTML responses, carry out the necessary modifications and then pass them on to the next block of memory or as called buffers. The error was that after the Ragel parser had been generated into c code language It generated to an  output as shown below. These sample output was the code in c language checking if the buffer had reached the end with an equality sign as shown.content writing services online