senddatagram.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 <errno.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <string.h>
#include <sys/socket.h>


#include "aodvPktInfo.h"
#include "aodvSocket.h"
#include "const.h"
#include "debug.h"
#include "helloMsg.h"
#include "inet.h"

void sendDatagram __P((struct AodvPktInfo *info, void *in_data, int datalen));

void sendDatagram(struct AodvPktInfo *info, void *in_data, int datalen){
  
  int bytesSent;
  struct sockaddr_in dest;
  void *out_data;
  if (info->ttl <= 0){
    return;//don't do anything
  }

  trace(TRACE_AODV_SOCKET,"sendDatagram");
  trace(TRACE_AODV_SOCKET,"sendDatagram(src=%s",inet_fmt_n(info->src,s1));
  trace(TRACE_AODV_SOCKET,"sendDatagram(dest=%s",inet_fmt_n(info->dest,s1));
  trace(TRACE_AODV_SOCKET,"sendDatagram(ttl=%u",info->ttl);
  out_data = (void *)(aodv_send_buf);
  memcpy (out_data, in_data, datalen);

  bzero((void *)&dest, sizeof(dest));
  dest.sin_family = AF_INET;
  dest.sin_port = htons(AODV_PORT);     // short, network byte order

  //set destination
  dest.sin_addr.s_addr = info->dest;
  
  /* Set the TTL */
  if (info->ttl > 0 && info->ttl < 256) {
    if (setsockopt(aodv_socket, SOL_IP, IP_TTL, &(info->ttl),
		   sizeof(info->ttl)) < 0) {
      log(LOG_ERR,TRUE,"UNABLE TO SET TTL");
    }
  } else {
    log(LOG_ERR,TRUE,"TTL WASN'T SET");
  }

  if ((bytesSent = sendto(aodv_socket, aodv_send_buf, datalen, 0, 
	     (struct sockaddr *)&dest, sizeof(struct sockaddr))) < 0) {
    trace(TRACE_AODV_SOCKET,"FAILED TO SEND DATAGRAM:%i",errno);
  } else {
    trace(TRACE_AODV_SOCKET,"sent data: %i bytes",bytesSent);
  }

  //for hello messages
  if ( info->dest == BROADCAST ){
    broadcastSent=TRUE;
  }

}