Very Computer

How I can redirect the stdin and stdout to a TCP connection?

The reason I asked this question is because I want to use a
regular shell application thru telnet. For example, if somebody
types telnet xxx.xxx.xxx.com 12345 I want my shell/C program
to attend the socket, but at the same time if I am at the
shell prompt I would like to execute the same program using
the standard IO.

Thanks in advance,
Miguel A. Rivera
AT&T Bell Labs.
Naperville, IL. 60563

if skd < 0  error

fork();

if child {

   close 0,
   close 1
   dup(skd);   /* to duplicate the socket as std input */
   dup(skd);   /* to duplicate the socket as the std output */

   exec the shell script
 }

/* parent do whatever you want */

Ravikanth Varahagiri

I'm not sure if this is appropriate for your needs, but another
way to accomplish this is to have your inetd setup to run
your C program.  When you do this, inetd automatically takes
care of all of the socket stuff, and starts up your C program,
and sets up stdin, stdout, and stderr to the socket.

Jim Lum

An example from the /etc/inetd.conf I have (not on spider.compart.fi):

systat  stream  tcp     nowait  guest   /usr/sbin/tcpd  /bin/ps -auwwx
netstat stream  tcp     nowait  guest   /usr/sbin/tcpd  /bin/netstat -tu

And those are the standard ps and netstat... Tcpd is from tcp_wrapper, you
don't need it for this (but it's otherwise a good thing to have).

--

"The world is indeed full of peril, and in it there are many dark places;
but still there is much that is fair, and though in all lands love is now
mingled with grief, it grows perhaps the greater." - J.R.R. Tolkien

?How I can redirect the stdin and stdout to a TCP connection?

?The reason I asked this question is because I want to use a
?regular shell application thru telnet. For example, if somebody
?types telnet xxx.xxx.xxx.com 12345 I want my shell/C program
?to attend the socket, but at the same time if I am at the
?shell prompt I would like to execute the same program using
?the standard IO.

Redirectoring of stdin and stdout to TCP connection not handle
telnet -options  (telnet commands which is started with byte 255)
correctly -- that way you don't talk telnet -protocol.

This may or may not hurt you. Just warning.
--
- Kari E. Hurtta                             /  El?m? on monimutkaista