/*
 * 
 *
 * Copyright 2000-2001 pilot <pilot@monkey.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include "osfinger.h"

void
osdetect(char *scanhost)
{
int sock;
struct sockaddr_in http;
struct hostent *he;


char osfinger[100];
char headBuff[4000];

char *ptr,*ptr2,*buffer_pointer,*cutbuf;



        if ((he = gethostbyname(NETCRAFT)) == NULL){
           perror("gethostbyname");
           exit(1);
        }
        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1){
           perror("socket");
           exit(1);
        }
        http.sin_family = AF_INET;
        http.sin_port = htons(80);
        http.sin_addr= *((struct in_addr *)he->h_addr);
        bzero(&(http.sin_zero),8);

        if (connect(sock, (struct sockaddr *)&http, sizeof(struct sockaddr)) == -1){
        perror("connect");
        exit(1);
        }

        snprintf(osfinger,sizeof(osfinger),"GET %s%s HTTP/1.0\n\n",NETCRAFT_FINGER,scanhost);
        send(sock,osfinger,strlen(osfinger),0);
        sleep(WAIT_TIME);
        recv(sock,headBuff,sizeof(headBuff),0);

        ptr = strstr(headBuff,"running <b>");

        if (ptr == NULL) {
        fprintf(stderr,"fast status,retry please\n");
        }
        else{
        ptr2 = strstr(ptr,"</b>.");
        *ptr2 = '\0';
        buffer_pointer = strdup(ptr);
        *ptr2 = '.';

        cutbuf=strtok(buffer_pointer,HTML_FILTER);
        fprintf(stdout,"%s Operating System Guess:\n",scanhost);
        while(cutbuf!=NULL){
        fprintf(stdout,"%s",cutbuf);
        cutbuf=strtok(NULL,HTML_FILTER );
        }
        printf("\n\n");
        free(buffer_pointer);
        }

 close(sock);

}