[LCP]interactive Telnet session

[Lucas King]

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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