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Establishing a JUNOScript Session

The following example illustrates how a client application written in C can use the SSH or Telnet protocol to establish a JUNOScript connection and session. In the line that begins with the string execlp, the client application invokes the ssh command. (Substitute the telnet command if appropriate.) The routing-platform argument to the execlp routine specifies the hostname or IP address of the JUNOScript server. The junoscript argument is the command that converts the connection to a JUNOScript session.

For more information about JUNOScript sessions, see Controlling the JUNOScript Session.



    int ipipes[ 2 ], opipes[ 2 ];
    pid_t pid;
    int rc;
    char buf[ BUFSIZ ];
    
    if (pipe(ipipes) <0 || pipe(opipes) <0)
        err(1, "pipe failed");
    
    pid = fork( );
    if (pid <0)
        err(1, "fork failed");
    
    if (pid == 0) {
        dup2(opipes[ 0 ], STDIN_FILENO);
        dup2(ipipes[ 1 ], STDOUT_FILENO);
        dup2(ipipes[ 1 ], STDERR_FILENO);
        close(ipipes[ 0 ]); /* close read end of pipe */
        close(ipipes[ 1 ]); /* close write end of pipe */
        close(opipes[ 0 ]); /* close read end of pipe */
        close(opipes[ 1 ]); /* close write end of pipe */
    
        execlp("ssh", "ssh", "-x",  routing-platform  , "junoscript", NULL);
        err (1, "unable to execute: ssh %s junoscript," router);
    }

    close(ipipes[ 1 ]); /* close write end of pipe */
    close(opipes[ 0 ]); /* close read end of pipe */



    if (write(opipes[ 1 ], initial_handshake, strlen(initial_handshake)) <0 )
        err(1, "writing initial handshake failed");
    
    rc=read(ipipes[ 0 ], buf, sizeof(buf));
    if (rc <0)
         err(1, "read initial handshake failed");

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