On Saturday, February 7, 2004, at 10:26 AM, Craig White wrote:
> On Sat, 2004-02-07 at 09:41, Jeff Seese wrote:
>> Group,
>> I have been trying for several days to figure out the telnet protocol
>> with for use in a custome application, but without any luck. Here is a
>> brief description of what I am trying to do, and what I have tried.
>>
>> I am trying to write an application that will run on a sharp Zaurus,
>> telnet to a local machine, execute some commands and then close the
>> connection. I am developing this on a Redhat 9 box, in c++ and
>> xcompiling for the Zaurus.
>>
>> I have found a few examples and source of telnet applications that I
>> can compile and get working for the Redhat platform, but they won't
>> compile with the arm-linux-g++ compiler.
>>
>> I have read lots of RFC's and tried to go back into the code of these
>> working applications that I have found to figure out what the telnet
>> protocol is, but I am afraid it's above my head.
>>
>> I am able to write an application that does the following.
>> - open a socket to port 23 on the remote machine from the Zaurus.
>> - The remote machine reports that a telnet session has started in the
>> messages log file.
>> - then I try to send my userID and password, but nothing appears in
>> the
>> log of the host machine, however I do get some odd looking characters
>> returned to the Zaurus. (yyp#!ypy##.....) This is where I need help.
>>
>> If I could get a simple example of a telnet handshake so I could
>> figure
>> out what I am supposed to be sending it, and what I should expect that
>> would be great.
>>
>> Unfortunately I can't use Perl and the net::telnet.
>>
>> Thanks in advance for any help,
>> Also, I know this is not exactly the correct list to offer to pay for
>> help..... But I am
>> willing to pay for help.
> ---
> I haven't done this with telnet but have with other programs such as
> wget, ftp and such.
>
> On your handheld, you can generally create a ~/.telnetrc with the user
> and password and host and those will automatically be read from the
> file
> and passed to your telnet application and provide authentication to the
> system you are trying to connect to.
>
> Recognize that most distro's don't enable telnet server if they even
> install it and you can see what is being logged - at least on Red Hat
> systems by looking at /var/log/secure and /var/log/messages. Also, the
> telnetd server daemon will launch and use settings from xinetd so your
> it would have to be configured to run, and settings in /etc/hosts.allow
> and /etc/hosts.deny would apply.
>
> On a redhat system, I would probably up2date (yum or apt-get) [install]
> telnetd
> then edit /etc/sysconfig/telnetd to state disable=no
> then restart xinetd (service xinetd restart)
> and I would be working - insecure but working.
>
> obligatory comment - use ssh instead, it's encrypted.
>
> Craig
>
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Thanks for the feed back,
Telnet is installed and running on my test machine that I am telnetting
to. I can telnet to it from other machines and watch the log files when
I connect and disconnect.
When my application is complete and in operation it will be connecting
to NEXT boxes, not linux (The NeXT machines control a piece of
manufacturing equipment). I have looked on them and I don't think they
even have an sshd. The machines are quite old. Telnet is already in use
on them for remote terminals, which are also running NeXT. The machines
are not networked together on any type of LAN, so the only access to
them is physically being in front of them.
I will look into the bash script a bit, however I would rather it's not
dependent on a script, plus this is for real time display of data from
the host machine. I don't think the results would be acceptable if I
had to negotiate the connection every few seconds to retrieve realtime
data.
I have tried all kinds of opening a pipe to telnet on the hand held,
but telnet only accepts input from the terminal not STDIN, so that
doesn't work.
I read somewhere an individual was trying to open a pipe to a tty, and
command that to open a telnet session. I don't quite understand if that
would work. Any ideas on that?
Thanks,
js
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