}

int ICMP:: recv_icmp(sockaddr *from)
{
char buf[MAXICMPLEN + 100];
int hlen1, icmplen;
struct ip *ip;
struct icmp *icmp;

if( Error() )
{
printf("Error() = %d\n", Error());
return -1;
}

socklen_t addrlen = 0;
int len = receive(buf, MAXICMPLEN+100, from , &addrlen);

if ( len == -1)
{
cout<<"Receive Failed\n";
return -1;
}

ip = (struct ip *)buf;
hlen1 = ip->ip_hl << 2;

icmp = (struct icmp *) (buf + hlen1);

if( (icmplen = len -hlen1) < 8)
{
cout<<"Receive Fail\n";
return -1;
}

memcpy(packet, icmp , icmplen);
// printf("11111\n");
return 0;
}

main(int argc, char *argv[])
{
ICMP icmp;
struct sockaddr from;
char *host;
int count;

if(argc < 2)
{
printf("can shu you wu\n");
exit(1);
}
if(argc == 2)
{
host = argv[1];
count = 5;
}
if( argc == 3)
{
host = argv[1];
count = 3;
}

for( int i=0; i<=count; i++)
{
icmp.setId(getpid());
icmp.setSeq(i);
char *test_data = "abcde";
icmp.send_icmp(host, test_data, strlen(test_data));
printf("count = %d\n", count);
}

int num = 1;
while(1)
{
if(icmp.recv_icmp(&from) < 0)
continue;
if(icmp.packet->icmp_type == ICMP_ECHOREPLY)
{
if( icmp.packet->icmp_id == getpid())
{
printf("%d bypes form %s: seq=%u, data=%s\n",
icmp.length, host, icmp.packet->icmp_seq, icmp.packet->icmp_data);
num++;
if(num > count)
break;
}

}
}
}