[LCP]interactive Telnet session

[Charles Randle]

Lucas King ,

What about output from STDERR (fd = 2) ? Have you
handled this as well ?

Best Regards,
Charles Randle

--- Lucas King <lking at fp.fairfax.com.au> wrote:
> Hello,
> 
> i am attempting to write a small C program, on a
> Linux box running 
> Redhat 7.2, that allows me to interact with a Telnet
> session.  i firstly 
> create a socketpair, then fork.  in the child
> process i start a Telnet 
> session, listed below, after "redirecting" the
> input/output to my 
> socket.  the parent process, not listed here,
> monitors the socket pair 
> and takes appropriate action depending on what i
> have stated in a 
> response file.  the parent, when not active blocks
> on a read from the 
> socket.
> 
> this program is mostly successful in that i am able
> to login and out. 
>  but i have one problem which i have been banging my
> head against for 
> several days now.  for reasons that i am unaware,
> the Telnet session 
> does not send all of its (display) output to the
> socket that i have 
> created.  instead it writes it directly to the
> display.  this occurs 
> just after i login to the remote system.  two sets
> of "strange" 
> characters appear on the screen.  after
> approximately 10 seconds the 
> Telnet session reports that it is unable to set two
> variables.  i am 
> assuming that it is attempting to query the terminal
> type but is not 
> receiving a response.
> 
> how does one go about fixing/resolving this problem?
> 
> 
> int main( void )
> {
>    pid_t pid;
>    int     fds[2];
>    .
>    if ( socketpair( AF_INET, SOCK_DGRAM, 0, fds ) <
> 0 ) . . . error 
> handling;
> 
>    pid = fork();
>    .
>    .
> } /* end function */
> 
> int child_process( int fd )
> {
>     if ( ( fd = dup2( 0, fd ) ) < 0 ) return 1;
>     if ( ( fd = dup2( 0, fd ) ) < 0 ) return 1;
> 
>     execlp( "telnet", "telnet", "128.8.8.8", NULL );
> 
>     return 0;
> } /* end function */
> 
> 
> any suggestions would/will be most appreciated.
> 
> thanking you in advance,
> 
> Lucas King
> 
> 
> 
> 
> 
>
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