[cs631apue] More questions for hw4
Jan Schaumann
jschauma at stevens.edu
Sat Nov 12 19:39:27 EST 2011
afonsec1 <afonsec1 at stevens.edu> wrote:
> 1. If IPv6 is enabled, should sws only accept IPv6 addresses and reject
> IPv4 ones ? or can the user enters a IPv4 address (ie 127.0.0.1) and sws
> should handle it even with IPv6b enabled?
You may choose how to handle this. It is not uncommon for an
application to have IPv6 support enabled on an add-on basis rather than
making it the only accepted mode, but either way is fine.
You may also choose how to handle the case if the user does not pass
'-6' but gives an IPv6 address as an argument to '-i'. You can either
have passing of an IPv6 address to '-i' imply '-6' or be an error if
'-6' was not specified.
> 2. http://hoohoo.ncsa.uiuc.edu/cgi/ doesn't work.
Yes, that apparently was taken down "recently". Look at
https://secure.wikimedia.org/wikipedia/en/wiki/Common_Gateway_Interface
and http://www.citycat.ru/doc/CGI/overview/overview.html instead.
> For the CGI functionality, you mention that any output is generated,
> but can you be more specific on this? For the cgi scripts, what
> language do you want us to use?
You are not writing a CGI script. You are adding support to your
webserver to execute CGI scripts.
> 3. Besides all requests, I do extra informational logging on debugging
> mode, If the user uses option -l [file], do you want only requests in
> the file?
'-l' will enable logging as described in the manual page. No additional
information should be logged.
If you are in debugging mode, you may choose to print out additional
information.
> 4. For port numbers 0 to 65535, are there a valid range (like outside
> of the well-known port numbers) that you want us to be? For example if
> the user enters port 80, do you want us to reject the giving port?
Your program should not reject any valid port number. 80 is a perfectly
valid port number, as are 1, 8080, 1234, 65535.
> 5. For the encryption mechanism, What is the behavior is the users
> enable secure mode but fail to give the key?
That is an error.
> 6. For hw4, do we need to support the GET and HEAD requests?
No, as in HW#4 you are not handling any requests whatsoever. See below.
> 7. In term of work, what is the difference between the final project
> and hw4? If we support all the command options functionalities, what do
> we have left for the final project?
The requirements for HW#4 are described at:
http://www.cs.stevens.edu/~jschauma/631/f11-hw4.html
That page notes that you do not implement any of the actual HTTP
handling in HW#4; all you do is fill in the framework. That includes
initializing the program for all command-line options, but does not
include writing the actual connection handling. All you do is accept
connections and invoke the 'sws_request' function, passing it the
connected socket.
-Jan
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