Date: Wed, 17 Jan 2007 11:50:56 -0800 From: Garrett Cooper <youshi10@u.washington.edu> To: freebsd-hackers@freebsd.org Subject: Re: Bridging console port to a telnet session Message-ID: <0C04473A-5713-44FD-90ED-CBA4F7CD20FC@u.washington.edu> In-Reply-To: <ecd0bee40701171100s54a29831g75f4961bad75accf@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> <17838.28502.527695.168624@bhuda.mired.org> <ecd0bee40701171100s54a29831g75f4961bad75accf@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Jan 17, 2007, at 11:00 AM, Kailas Ramasamy wrote: > 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> <mik >> e<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>> Kailas cross posted this to the questions@ list too. I gave a possible answer there. -Garrett
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?0C04473A-5713-44FD-90ED-CBA4F7CD20FC>