/* *   OSPFD routing simulation controller *   Linux-specific portion *   Copyright (C) 1999 by John T. Moy *    *   This program is free software; you can redistribute it and/or *   modify it under the terms of the GNU General Public License *   as published by the Free Software Foundation; either version 2 *   of the License, or (at your option) any later version. *    *   This program is distributed in the hope that it will be useful, *   but WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *   GNU General Public License for more details. *    *   You should have received a copy of the GNU General Public License *   along with this program; if not, write to the Free Software *   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/time.h>#include <sys/resource.h>#include <sys/param.h>#include <unistd.h>#include <tcl.h>#include <tk.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <errno.h>#include <signal.h>#include <syslog.h>#include "../src/ospfinc.h"#include "../src/monitor.h"#include "../src/system.h"#include "tcppkt.h"#include "linux.h"#include "sim.h"#include "simctl.h"#include <time.h>// External referencesextern SimCtl *sim;/* Start a simulated router. * Router uses two sockets, one for monitoring and * one to receive OSPF packets. * The former we allocate so that they are in well known * places, the latter the router allocates. */int StartRouter(ClientData, Tcl_Interp *, int, char *argv[]){    char server_port[8];    sprintf(server_port, "%d", (int) sim->assigned_port);    // Child is now a simulated router    if (fork() == 0) {        execlp("ospfd_sim", "ospfd_sim", argv[1], server_port, 0);	// Should never get this far	perror("execl ospfd_sim failed");	exit(1);    }    return(TCL_OK);}