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Date:      Wed, 17 Jan 2007 13:47:50 -0500
From:      Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org>
To:        "Kailas Ramasamy" <kailasr@gmail.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Bridging console port to a telnet session
Message-ID:  <17838.28502.527695.168624@bhuda.mired.org>
In-Reply-To: <ecd0bee40701171024p7c5b4944of45b4c407ed3c5f4@mail.gmail.com>
References:  <ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com> <17837.25293.686122.147525@bhuda.mired.org> <ecd0bee40701161732v26112f24o2d8323c2777d2f7@mail.gmail.com> <17837.36471.343582.464631@bhuda.mired.org> <ecd0bee40701171024p7c5b4944of45b4c407ed3c5f4@mail.gmail.com>

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In <ecd0bee40701171024p7c5b4944of45b4c407ed3c5f4@mail.gmail.com>, Kailas Ramasamy <kailasr@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@mired.org> wrote:
> >
> > In <ecd0bee40701161732v26112f24o2d8323c2777d2f7@mail.gmail.com>, Kailas
> > Ramasamy <kailasr@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@mired.org> wrote:
> > > >
> > > > In <ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com>,
> > Kailas
> > > > Ramasamy <kailasr@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@mired.org>
> > > > http://www.mired.org/consulting.html
> > > > Independent Network/Unix/Perforce consultant, email for more
> > information.
> > > >
> > > _______________________________________________
> > > freebsd-hackers@freebsd.org mailing list
> > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> > > To unsubscribe, send any mail to "
> > freebsd-hackers-unsubscribe@freebsd.org"
> > >
> >
> > --
> > Mike Meyer <mwm@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&#39;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> &lt;<a href="mailto:mwm@mired.org">mwm@mired.org</a>&gt; 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 &lt;<a href="mailto:ecd0bee40701161732v26112f24o2d8323c2777d2f7@mail.gmail.com">ecd0bee40701161732v26112f24o2d8323c2777d2f7@mail.gmail.com</a>&gt;, Kailas Ramasamy &lt;<a href="mailto:kailasr@gmail.com">kailasr@gmail.com
> </a>&gt; typed:<br>&gt; Hi Mike,<br>&gt; Yes, that what I am planing but I want to do this dynamically. Do you know<br>&gt; how to launch a<br>&gt; telnet session from a process?. How do I pass stdin and stdout to the telnet
> <br>&gt; from a process?.<br><br>See the fork() and exec() man pages.<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;mike<br><br><br>&gt; On 1/16/07, Mike Meyer &lt;<a href="mailto:mwm@mired.org">mwm@mired.org</a>&gt; wrote:<br>&gt; &gt;<br>&gt; &gt; In &lt;
> <a href="mailto:ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com">ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com</a>&gt;, Kailas<br>&gt; &gt; Ramasamy &lt;<a href="mailto:kailasr@gmail.com">kailasr@gmail.com
> </a>&gt; typed:<br>&gt; &gt; &gt; Hi,<br>&gt; &gt; &gt; Within a FreeBSD system, I want to telnet to another system and bridge<br>&gt; &gt; that<br>&gt; &gt; &gt; session to the<br>&gt; &gt; &gt; console port so that when an user connects to the system via console
> <br>&gt; &gt; port,<br>&gt; &gt; &gt; it is automatically<br>&gt; &gt; &gt; redirected to other system for I have already established a telnet<br>&gt; &gt; session.<br>&gt; &gt;<br>&gt; &gt; What&#39;s wrong with simply leaving a telnet session running on the
> <br>&gt; &gt; console, maybe with some support to relaunch it should it ever exit?<br>&gt; &gt;<br>&gt; &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;mike<br>&gt; &gt; --<br>&gt; &gt; Mike Meyer &lt;<a href="mailto:mwm@mired.org">mwm@mired.org</a>&gt;
> <br>&gt; &gt; <a href="http://www.mired.org/consulting.html">http://www.mired.org/consulting.html</a><br>&gt; &gt; Independent Network/Unix/Perforce consultant, email for more information.<br>&gt; &gt;<br>&gt; _______________________________________________
> <br>&gt; <a href="mailto:freebsd-hackers@freebsd.org">freebsd-hackers@freebsd.org</a> mailing list<br>&gt; <a href="http://lists.freebsd.org/mailman/listinfo/freebsd-hackers">http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> </a><br>&gt; To unsubscribe, send any mail to &quot;<a href="mailto:freebsd-hackers-unsubscribe@freebsd.org">freebsd-hackers-unsubscribe@freebsd.org</a>&quot;<br>&gt;<br><br>--<br>Mike Meyer &lt;<a href="mailto:mwm@mired.org">
> mwm@mired.org</a>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<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@mired.org>		http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.



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