proxlib/README

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+=============+
| proxlib |
+=============+
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Proxy C library for HTTP/s protocol
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NOTE: I have yet to turn this piece of clutter into a library.
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RFC: datatracker.ietf.org/doc/html/rfc1945
RES: cs.princeton.edu/courses/archive/spr13/cos461/assignments-proxy.html
RES: Beej's Guide to Network Programming - Using Internet Sockets
RES: en.wikipedia.org/wiki/Proxy_server
RES: TCP/IP sockets in C - Practical guide for programmers 2nd edition
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RES: tinyproxy.github.io/
RES: github.com/nginx/nginx
TECHNICALS
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* Parsing is carried by a dedicated sub-library which I wrote named parslib.
* Mass string comparisons are carried by another dedicated sub-library which
I wrote named streecmp. It runs in O(n) time. n being the lenght of the string -
no matter the amount of strings you want to compare it against (I am indeed
aware it is nonetheless worse than hashtables - maybe one day I will implement
those on my own as well).
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* After the connection is established with the upstream server, a relay loop
is started in which the client data is relayed to the server's socket and
server data is relayed to client's socket. This is highly inspired from
tinyproxy.
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TASKS
[DONE] Forward data between client/server
[DONE] Connect with parslib
[DONE] Implement client message parsing
[DONE] Implement server message parsing
[DONE] Add loose string checking for headers
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[DONE] Relaying mechanism
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[DOING] Cover all possible body segmentation standards
[DONE] Cover Content-Length
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[DONE] Cover "chunked transfer encoding"
[TODO] Cover "compress transfer encoding"
[TODO] Cover "deflate transfer encoding"
[TODO] Cover "gzip/x-gzip transfer encoding"
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[ACTIVELY DOING] More testing, debugging, fixing
[ACTIVELY DOING] Verify and search for memory leaks
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[TODO] Implement HTTPS
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[TODO] Caching?
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COMMITS
Each commit is prefixed with an indicator token of what the change is
*mostly* about. List of tokens is:
* init: change initialized the repository
* repo: change is about the repository in general
* proxy: change is about the proxy in general
* logic: change is about proxy logic - parsing, forwarding, ...
* fix: change is about fixing a bug or TODO