/* SpyWeb
	
   $gcc -o spyweb spyweb.c

   Utilidad que verifica que servidor se esta ejecutando, enviando el request
   de la cabecera.
	
   c0d3d by Spy]-[unt3R

*/

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

#define PORT 80
#define MAX 2000

int main(int argc, char *argv[]){

	int sockfd;
	int numbytes;
	int port;
	struct sockaddr_in server_addr;
	struct hostent *he;
	char *header_request;  
	char buffer[MAX];
	
	header_request="HEAD / HTTP/1.0\n\n";

	printf("[--- SpyWeb Determina que servidor se esta ejecutando   ---]\n");
	printf("[--- c0d3d by Spy]-[unt3R (spyhunt3r@yahoo.com)         ---]\n");
	printf("[--- -------------------------------------------------- ---]\n");  
	
	
	if(argc<2){
		printf("[--- Uso:spyweb <host> [port]                           ---]\n");
		exit(1);
	}

	if(argc>2)
		port=atoi(argv[2]);
	else{
		printf("[--- Usando puerto 80 por defecto                       ---]\n\n");
		port=PORT;
	}

	if((he=gethostbyname(argv[1]))==NULL){
		printf("[--- Error en gethostbyname()                           ---]\n");
		printf("[--- Host no encontrado!                                ---]\n");
		exit(1);
	}
	printf("[1] gethostbyname() resuelto!\n");
	
	if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
		printf("Error al crear el socket\n");
		exit(1);
	}
	printf("[2] socket creado:%d\n", sockfd);

	server_addr.sin_family=AF_INET;
	server_addr.sin_port=htons(port);
	server_addr.sin_addr=*((struct in_addr *)he->h_addr);
	bzero(&(server_addr.sin_zero), 8);

	if(connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr))==-1){ 
		printf("[--- Error en connect()                                 ---]\n");
		printf("[--- Puerto no disponible                               ---]\n");
		exit(1);
	}
	printf("[3] status:conectado\n");

	send(sockfd, header_request, strlen(header_request), 0);
	printf("[4] mensaje enviado!\n");

	if((numbytes=recv(sockfd, buffer, sizeof(buffer),0))==-1){ 
		printf("[--- Error en recv()                                    ---]\n");
		exit(1);
	}

	buffer[numbytes] ='\0';
	printf("%s\n", buffer);

	close(sockfd);
	printf("[5] cerrando socket!\n");
	
	return 0;
}