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

#define PORT 80

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

        int sockfd;
        struct hostent *he;
        struct sockaddr_in their_addr;

        if( argc != 3 ){

                printf("./pt <host> <port>\n");
                exit(1);

        }

        if( (sockfd= socket(AF_INET, SOCK_STREAM, 0)) == -1){

                perror("socket");
                exit(1);

        }

        if( (he=gethostbyname(argv[1])) == NULL ){
                perror("gethostbyname");
                exit(1);
        }

        their_addr.sin_family = AF_INET;
        their_addr.sin_port = htons(PORT);
        their_addr.sin_addr = *(( struct in_addr *)he->h_addr);
        memset(&(their_addr.sin_zero), '\0', 8);

        if( connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1){
                printf("down\n");
                perror("connect");
 }
        else{
                printf("up\n");
                close(sockfd);
        }
}