Date: Wed, 17 Jan 2007 11:00:43 -0800 From: "Kailas Ramasamy" <kailasr@gmail.com> To: "Mike Meyer" <mwm@mired.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Bridging console port to a telnet session Message-ID: <ecd0bee40701171100s54a29831g75f4961bad75accf@mail.gmail.com> In-Reply-To: <17838.28502.527695.168624@bhuda.mired.org> 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> <17838.28502.527695.168624@bhuda.mired.org>
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Hi Mike, Thanks a lot. This is what I was looking for. -Kailas On 1/17/07, Mike Meyer <mwm@mired.org> wrote: > > 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'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@mired.org">mwm@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@mail.gmail.com"> > ecd0bee40701161732v26112f24o2d8323c2777d2f7@mail.gmail.com</a>>, Kailas > Ramasamy <<a href="mailto:kailasr@gmail.com">kailasr@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@mired.org">mwm@mired.org</a>> > wrote:<br>> ><br>> > In < > > <a href="mailto: > ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com"> > ecd0bee40701161503k385819ddgba5562e137630617@mail.gmail.com</a>>, > Kailas<br>> > Ramasamy <<a href="mailto:kailasr@gmail.com"> > kailasr@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@mired.org"> > mwm@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@freebsd.org"> > freebsd-hackers@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@freebsd.org"> > freebsd-hackers-unsubscribe@freebsd.org</a>"<br>><br><br>--<br>Mike > Meyer <<a href="mailto:mwm@mired.org"> > > mwm@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@mired.org> > http://www.mired.org/consulting.html > Independent Network/Unix/Perforce consultant, email for more information. >
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