hellomsg.c

ucsb大学开发的aodv路由协议代码。

/*
 * Copyright (C) 2001, University of California, Santa Barbara
 * 
 * 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.
 * 
 * Other copyrights might apply to parts of this software and are so
 * noted when applicable.
 */

/*
 * Parts of this program has been derived from PIM sparse-mode pimd.
 * The pimd program is covered by the license in the accompanying file
 * named "LICENSE.pimd".
 *  
 * The pimd program is COPYRIGHT 1998 by University of Southern California.
 *
 */
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>

#include "aodvConst.h"
#include "aodvPktInfo.h"
#include "callout.h"
#include "const.h"
#include "debug.h"
#include "inet.h"
#include "rrep.h"
#include "sendDatagram.h"

int helloMsgSend = TRUE;
int helloMsgRecv = TRUE;
int broadcastSent = FALSE;

static void sendHelloMsg __P(());

void startHelloMsg(){
  int j;
  j=-250+(int) (500.0*random()/(RAND_MAX+1.0));
  trace(TRACE_HELLO,"start random delay %i",j);
  trace(TRACE_HELLO|TRACE_INIT|TRACE_TIMER
	,"startHelloMsg %i",HELLO_INTERVAL+j);
  timer_setTimer(HELLO_INTERVAL+j,sendHelloMsg,NULL);
}

static void sendHelloMsg(){
  struct RREP rrep;
  struct AodvPktInfo info;
  int j;

  if (broadcastSent == FALSE){
    rrep.src=getip();
    rrep.dest=getip();
    fill_my_rrep(&rrep);
    rrep.lifetime=htonl(ALLOWED_HELLO_LOSS * HELLO_INTERVAL);
    fill_pktInfo(&info,BROADCAST);
    info.ttl=1;
    trace(TRACE_METRIC,"s h RREP");
    sendDatagram(&info,&rrep,sizeof(struct RREP));
  }
  broadcastSent=FALSE;
  
  j=-250+(int) (500.0*random()/(RAND_MAX+1.0));
  trace(TRACE_HELLO,"random delay %i",j);
  trace(TRACE_HELLO|TRACE_TIMER,"sendHelloMsg %i",HELLO_INTERVAL+j);
  timer_setTimer(HELLO_INTERVAL+j,sendHelloMsg,NULL);
}