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

#define PORT 3490
#define MAXDATASIZE 100

int main(int argc, char *argv[])
{
    int sockfd, numbytes, err;  
    char buf[MAXDATASIZE];
    struct sockaddr_in their_addr;
    struct addrinfo hints, *res;

    if (argc != 2) {
        fprintf(stderr,"usage: client host\n");
        exit(1);
    }

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

    their_addr.sin_family = AF_INET;
    their_addr.sin_port = htons(PORT);
    

    /* Set hits */
    memset( &hints, 0, sizeof( hints ) );
    hints.ai_family    = PF_INET;
    hints.ai_socktype  = SOCK_STREAM;
    hints.ai_flags    |= AI_CANONNAME;
    
    /* Look up address */
    if ( ( err = getaddrinfo( argv[ 1 ],
			      NULL, &hints, &res ) ) != 0 )
      printf( "getaddrinfo: %s\n", gai_strerror( err ) );
    else
      {
	char host[ NI_MAXHOST ];
	struct addrinfo *i = res;
	
#ifdef DEBUG
	printf( "'%s' has the following IP " \
		"addresses translations:\n", 
		argv[ 1 ] );
	while ( i ) 
	  {
	    inet_ntop( i->ai_family, 
	      &((struct sockaddr_in *) i->ai_addr)->sin_addr,
		       host, NI_MAXHOST );
	      printf( " >%s (%s)\n", host, i->ai_canonname );
	      i = i->ai_next;
	    }
	  inet_ntop( res->ai_family, 
	    &((struct sockaddr_in *) res->ai_addr)->sin_addr,
		     host, NI_MAXHOST );
	  printf( "Setting IP to %s\n", host );
#endif	  
	  memcpy( &their_addr.sin_addr, 
	    &((struct sockaddr_in *) res->ai_addr)->sin_addr, 
		  sizeof( struct in_addr ) );
	  freeaddrinfo( res );
      }

    memset(&(their_addr.sin_zero), '\0', 8);

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

    if ((numbytes=recv(sockfd, buf, 
		       MAXDATASIZE-1, 0)) == -1) {
        perror("recv");
        exit(1);
    }

    buf[numbytes] = '\0';

    printf("Received: %s",buf);

    close(sockfd);

    return 0;
}


/* author: Gustavo Sverzut Barbieri (http://www.gustavobarbieri.com.br) */