/* Way to find out version of remote httpd server */
/* Written by Shok.      --==+*~(Shok)~*+==--     */

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

#define ERROR -1 
#define MAXDATASIZE 300

char buf[MAXDATASIZE];
char message[] = "HEAD / HTTP/1.0\n\n";

/* Function prototypes */
char *GetHTTPVer(char *);


void main(int argc, char **argv)
{
  GetHTTPVer(argv[1]);
}

char *GetHTTPVer(char *host)
{
  char *p;
  int s;   
  int i;    
  int numbytes;
  struct sockaddr_in sock;
  struct hostent *he;


  if ((he=gethostbyname(host)) == NULL) {
	herror("gethostbyname");
	exit(1);
  }

  if ((s = socket(AF_INET, SOCK_STREAM, 0)) == ERROR) {
	perror("socket");
	exit(1);
  }
  

  sock.sin_family = AF_INET;
  sock.sin_port = htons(80);
  sock.sin_addr =  *((struct in_addr *)he->h_addr);  
  bzero(&(sock.sin_zero), 8);

  if (connect(s, (struct sockaddr *)&sock, sizeof(struct sockaddr)) == ERROR) 
  {
	perror("connect");
        exit(1);
  }
 
  if ((send(s, message, strlen(message), 0)) == ERROR) { 
   	perror("send");
        close(s);
	exit(1);
  }

  for (i=0;i<5;i++) {
  	if((numbytes=recv(s, buf, MAXDATASIZE, 0)) == ERROR) {
  		perror("recv");
                close(s);
		exit(1);
  	} 
  
         buf[numbytes] = '\0';
         p=strstr(buf, "Server");
         printf("%s\n", p);
         
  }

  close(s);
  return buf;
}