Bridging console port to a telnet session
Kailas Ramasamy
kailasr at gmail.com
Wed Jan 17 19:00:45 UTC 2007
Hi Mike,
Thanks a lot. This is what I was looking for.
-Kailas
On 1/17/07, Mike Meyer <mwm at mired.org> wrote:
>
> In <ecd0bee40701171024p7c5b4944of45b4c407ed3c5f4 at mail.gmail.com>, Kailas
> Ramasamy <kailasr at gmail.com> typed:
> > Hi Mike,
> > I read through fork() and exec() man pages but I couldn't find anything
> > related to
> > this. Basically, I want to launch a telnet session from a process and
> pass
> > in
> > /dev/console as stdin and stdout.
>
> Well, you don't really need fork(), though fork() follows exec() so
> often than some OS's combine them into a single call. And I just
> noticed that if you do "man exec", you get the shell's page - you want
> exec(3), to get the C calls.
>
> Anyway, the sequence is:
>
> Use open() to get an fd pointing at /dev/console.
> Use dup2() to copy that fd to stdin and stdout (and probably stderr).
> Use an exec() function to launch telnet.
>
> <mike
>
>
> > Thanks
> > Kailas
> >
> > On 1/16/07, Mike Meyer <mwm at mired.org> wrote:
> > >
> > > In <ecd0bee40701161732v26112f24o2d8323c2777d2f7 at mail.gmail.com>,
> Kailas
> > > Ramasamy <kailasr at gmail.com> typed:
> > > > Hi Mike,
> > > > Yes, that what I am planing but I want to do this dynamically. Do
> you
> > > know
> > > > how to launch a
> > > > telnet session from a process?. How do I pass stdin and stdout to
> the
> > > telnet
> > > > from a process?.
> > >
> > > See the fork() and exec() man pages.
> > >
> > > <mike
> > >
> > >
> > > > On 1/16/07, Mike Meyer <mwm at mired.org> wrote:
> > > > >
> > > > > In <ecd0bee40701161503k385819ddgba5562e137630617 at mail.gmail.com>,
> > > Kailas
> > > > > Ramasamy <kailasr at gmail.com> typed:
> > > > > > Hi,
> > > > > > Within a FreeBSD system, I want to telnet to another system and
> > > bridge
> > > > > that
> > > > > > session to the
> > > > > > console port so that when an user connects to the system via
> console
> > > > > port,
> > > > > > it is automatically
> > > > > > redirected to other system for I have already established a
> telnet
> > > > > session.
> > > > >
> > > > > What's wrong with simply leaving a telnet session running on the
> > > > > console, maybe with some support to relaunch it should it ever
> exit?
> > > > >
> > > > > <mike
> > > > > --
> > > > > Mike Meyer <mwm at mired.org>
> > > > > http://www.mired.org/consulting.html
> > > > > Independent Network/Unix/Perforce consultant, email for more
> > > information.
> > > > >
> > > > _______________________________________________
> > > > freebsd-hackers at freebsd.org mailing list
> > > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> > > > To unsubscribe, send any mail to "
> > > freebsd-hackers-unsubscribe at freebsd.org"
> > > >
> > >
> > > --
> > > Mike Meyer <mwm at mired.org>
> > > http://www.mired.org/consulting.html
> > > Independent Network/Unix/Perforce consultant, email for more
> information.
> > >
> > Hi Mike,<br>I read through fork() and exec() man pages but I
> couldn't find anything related to<br>this. Basically, I want to launch a
> telnet session from a process and pass in <br>/dev/console as stdin and
> stdout. <br>
> > <br>Thanks<br>Kailas<br><br><div><span class="gmail_quote">On 1/16/07,
> <b class="gmail_sendername">Mike Meyer</b> <<a href="mailto:
> mwm at mired.org">mwm at mired.org</a>> wrote:</span><blockquote
> class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204);
> margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
> > In <<a href="mailto:
> ecd0bee40701161732v26112f24o2d8323c2777d2f7 at mail.gmail.com">
> ecd0bee40701161732v26112f24o2d8323c2777d2f7 at mail.gmail.com</a>>, Kailas
> Ramasamy <<a href="mailto:kailasr at gmail.com">kailasr at gmail.com
> > </a>> typed:<br>> Hi Mike,<br>> Yes, that what I am planing but
> I want to do this dynamically. Do you know<br>> how to launch a<br>>
> telnet session from a process?. How do I pass stdin and stdout to the telnet
> > <br>> from a process?.<br><br>See the fork() and exec() man
> pages.<br><br> <mike<br><br><br>>
> On 1/16/07, Mike Meyer <<a href="mailto:mwm at mired.org">mwm at mired.org</a>>
> wrote:<br>> ><br>> > In <
> > <a href="mailto:
> ecd0bee40701161503k385819ddgba5562e137630617 at mail.gmail.com">
> ecd0bee40701161503k385819ddgba5562e137630617 at mail.gmail.com</a>>,
> Kailas<br>> > Ramasamy <<a href="mailto:kailasr at gmail.com">
> kailasr at gmail.com
> > </a>> typed:<br>> > > Hi,<br>> > > Within a FreeBSD
> system, I want to telnet to another system and bridge<br>> >
> that<br>> > > session to the<br>> > > console port so that
> when an user connects to the system via console
> > <br>> > port,<br>> > > it is automatically<br>> >
> > redirected to other system for I have already established a
> telnet<br>> > session.<br>> ><br>> > What's wrong with
> simply leaving a telnet session running on the
> > <br>> > console, maybe with some support to relaunch it should it
> ever exit?<br>> ><br>>
> > <mike<br>> >
> --<br>> > Mike Meyer <<a href="mailto:mwm at mired.org">
> mwm at mired.org</a>>
> > <br>> > <a href="http://www.mired.org/consulting.html">
> http://www.mired.org/consulting.html</a><br>> > Independent
> Network/Unix/Perforce consultant, email for more information.<br>>
> ><br>> _______________________________________________
> > <br>> <a href="mailto:freebsd-hackers at freebsd.org">
> freebsd-hackers at freebsd.org</a> mailing list<br>> <a href="
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers">
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> > </a><br>> To unsubscribe, send any mail to "<a href="mailto:
> freebsd-hackers-unsubscribe at freebsd.org">
> freebsd-hackers-unsubscribe at freebsd.org</a>"<br>><br><br>--<br>Mike
> Meyer <<a href="mailto:mwm at mired.org">
> > mwm at mired.org</a>> <a
> href="http://www.mired.org/consulting.html">
> http://www.mired.org/consulting.html</a><br>Independent
> Network/Unix/Perforce consultant, email for more
> information.<br></blockquote></div>
> > <br>
>
> --
> Mike Meyer <mwm at mired.org>
> http://www.mired.org/consulting.html
> Independent Network/Unix/Perforce consultant, email for more information.
>
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