Re: telnet daemon
Re: telnet daemon
- Subject: Re: telnet daemon
- From: Terry Lambert <email@hidden>
- Date: Fri, 21 Aug 2009 14:43:25 -0700
On Aug 21, 2009, at 11:59 AM, Ariel Feinerman wrote:
Hi developers,
I must write simple telnetd for Mac as an exam, but I have never
write network programme, I look for exist telnet in the Darwin
source to look at it, but I could not find ...
Is there telnet for Darwin?
I don't think looking at someone else's telnet/telnetd sources and
then cribbing from that is going to demonstrate the knowledge and
problem solving skills you were intended to demonstrate, if this was
actually given as an exam project.
If this is an exam, I imagine it's intended to test your abilities in:
reading specifications, implementing specifications, testing for
interoperability, network socket programming, input/output
multiplexing, termios programming, the concept of byte-stuffing and
unstuffing, pty allocation, master/slave pty operations, etc..
Depending on specific requirements for what constitutes "simple", it
may also include local user authentication, session management, PAM,
and other topics.
If I had assigned this as an exam, and you come back with a full blown
implementation, I'd challenge you, and if you could not explain your
design decisions or the operation of the code adequately to make me
believe the code was yours, that would be an insta-fail. I'd also
challenge it if the coding style varied widely.
Try:
<www.ietf.org/rfc/rfc854.txt>
and:
<www.omnifarious.org/~hopper/telnet-rfc.html>
for starters, instead. You might also want to look for the book:
UNIX Network Programming
PS: Since most people use ssh instead of telnet to talk to Mac OS X
machines, the Mac OS X telnetd is not as strongly maintained, and has
a number of flaws when it comes to interacting with host
authentication mechanisms and establishing sessions and session
credentials in the kernel, so it might not be the best example from
that perspective, either.
-- Terry
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| | >telnet daemon (From: Ariel Feinerman <email@hidden>) |