krt.cc

RSA algorithm implementation is given

#include "common.h"
#include "externDec.h"


struct rtentry *gen_krtentry( rtable_entry rtEntry )
{

	  struct rtentry *new_rtentry;
	  struct sockaddr_in dst;
	  struct sockaddr_in gw;
	  struct sockaddr_in genmask;
	  unsigned int netmask=0xffffffff;

#ifdef DEBUG
	  cout << "gen_krtentry: Entered" << endl;
#endif

	  if((new_rtentry = (struct rtentry *)malloc(sizeof(struct rtentry))) == NULL)
	  {
		perror("Error in malloc");
	   	return NULL; 
	  }

	  bzero((void *)new_rtentry,sizeof(struct rtentry));
	  bzero((void *)&dst,sizeof(struct sockaddr_in));
	  bzero((void *)&gw,sizeof(struct sockaddr_in));
	  bzero((void *)&genmask,sizeof(struct sockaddr_in));

	  dst.sin_family = AF_INET;
	  gw.sin_family = AF_INET;
	  genmask.sin_family = AF_INET;

	  dst.sin_addr.s_addr = rtEntry.getDestIP();

	  struct in_addr 	addr_temp;
	  addr_temp.s_addr = g_my_ip;
#ifdef DEBUG
	  cout << "gen_krtentry: Local Host is   " << inet_ntoa(addr_temp) << endl;
	  addr_temp.s_addr = rtEntry.getDestIP();
	  cout << "gen_krtentry: DstIP is   " << inet_ntoa(addr_temp) << endl;
	  addr_temp.s_addr = rtEntry.getNextHop();
	  cout << "gen_krtentry: Nxt Hop is   " << inet_ntoa(addr_temp) << endl;
#endif

	  if( rtEntry.getRTMetric() == 1)
	  {
#ifdef DEBUG
		cout << " routingTable: gen_krtentry: 1 hop cnt " << endl;
#endif
	  	gw.sin_addr.s_addr = g_my_ip;
	  }
	  else
	  {
#ifdef DEBUG
		cout << " routingTable: gen_krtentry: multi hop cnt " << endl;
#endif
	  	gw.sin_addr.s_addr = rtEntry.getNextHop();
	  }

#ifdef DEBUG
	  cout << "gen_krtentry: metric is " << rtEntry.getRTMetric() << endl;
#endif

	  genmask.sin_addr.s_addr = netmask;

	  new_rtentry->rt_flags = RTF_UP | RTF_HOST | RTF_GATEWAY;
	  new_rtentry->rt_metric = (short)rtEntry.getRTMetric();
	  new_rtentry->rt_dev = interface;
	  new_rtentry->rt_dst = *(struct sockaddr*) &dst;
	  new_rtentry->rt_gateway = *(struct sockaddr*) &gw;
	  new_rtentry->rt_genmask = *(struct sockaddr*) &genmask;

	  return new_rtentry;
}

int		add_kroute( rtable_entry  rtEntry )
{
	  struct rtentry  *new_krtentry;

#ifdef DEBUG
	  cout << "add_kroute: Entered" << endl;
#endif

	  if ((new_krtentry = gen_krtentry(rtEntry)) == NULL)
	  {
	     cout << "Error in gen_krtentry" << endl;
	    return -1;
	  }

	  if(ioctl(ksock, SIOCADDRT,(char*) new_krtentry) == -1)
	  {
#ifdef DEBUG
		  cout << "routingTable: add_kroute: ioctl failed " << endl;
        perror("Error in ioctl- adding routes");
#endif
	    return -1;
	  }

	  free(new_krtentry);
	  return 0;
}

int	del_kroute( rtable_entry rtEntry )
{
	  struct rtentry  *new_krtentry;

#ifdef DEBUG
	  cout << "del_kroute: Entered" << endl;
#endif
	  if ((new_krtentry = gen_krtentry(rtEntry)) == NULL)
	  {
	  	cout << "del_kroute: error in gen_krtentry " << endl;
	  	return -1;
	  }

	  if(ioctl(ksock, SIOCDELRT, (char*) new_krtentry) == -1)
	  {
#ifdef DEBUG
	  	cout << "routingTable: del_kroute: ioctl failed " << endl;
        perror("Error in ioctl- deleting routes");
#endif
	    return -1;
	  }
	  return 0;
	  free(new_krtentry);

}