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日期:2021-06-21 10:39

WebServer

Our final project is a group assignment. You will need to find a partner. No one can work alone and there can only be one group of 3 (ok’ed by me). Not finding a partner will mean getting a 0 on the assignment.


A web server is a program that connects to a port (networking), listens for requests and sends the appropriate file to the requestor. Web servers must respond to requests and create a response using the “HTTP protocol (https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol). For our web server, we will use only the most critical portions of the protocol:

A request (which you will receive) will consist of the word “GET”, a space, a path to the file, a space and then the version of HTTP which is implemented (you can ignore this) all on the first line. There will be other lines to the request – you can ignore them.

A response (which you will generate) will consist of: the string “HTTP/1.0 “, followed by code (200 for OK or 404 for file not found), a new line, then “Content-Length: “ + the number of bytes of the response followed by 2 new lines.

An example session follows. Red is the request, blue is the response:

GET /test2.html HTTP/1.1

Host: localhost:8000

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

DNT: 1

Connection: keep-alive

Upgrade-Insecure-Requests: 1

HTTP/1.0 200 OK

Content-Length:6


test2


Your program should run on port 8000 (port 80, which is the usual for web applications, will be blocked by your firewall). Your program should take a path as a parameter (and fail with a usage message if there is no parameter). That path will be the path that your web server will use to serve files. For example – let’s say that the path is /home/mphipps. If I try to access localhost:8000/secret/data.html, your web server will look at: /home/mphipps/secret and try to serve data.html. If the file is there, it should return it with a “200 OK” message, as above. If the file does not exist, you should return a “404 Not Found” message with a pre-designed response (could be a file or could be a hard coded message).

Your web server should launch a new thread for each request. You should use POSIX commands for files (no fopen/fclose/etc) and pthreads for threadedin. Your web server should be an infinite loop of waiting for and processing requests.

Hints:

Don’t wait – start this soon.

My code was around 150 lines. Yours should not be much longer or shorter.


RubricPoorOK GoodGreat

CommentsNone/Excessive (0)“What” not “Why”, few (5)Some “what” comments or missing some (7)Anything not obvious has reasoning (10)

Variable/Function namingSingle letters everywhere (0)Lots of abbreviations (5)Full words most of the time (8)Full words, descriptive (10)

Structure Globals everywhere, indentation doesn’t match braces {}, no helper functions (0)Any 2 of:

Too many globals

Indentation wrong

Missing helper functions (5)Any 1 of:

Too many globals

Indentation wrong

Missing helper functions (13)Few/no globals, indentation correct, helper functions(20)

ThreadingNo threading (0) One thread per request (10)

NetworkingNo networking (0)Some attempt at setup/listening (10) Setup, Listening and teardown work correctly (20)

File HandlingNone/uses “f” style functions (0)Uses open/close/read (10)Uses open/close/read/stat (20)

HTTPNo attempt at HTTP (0)Reads requests (3)Reads requests, handles 200 responses (7)Requests, 200, 404 (10)


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