#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>

#define PORT        3490
#define MAXDATASIZE 100

int main( int argc, char *argv[] )
{
  int sockfd, numbytes, localport; 
  char buf[ MAXDATASIZE ];
  struct sockaddr_in their_addr, my_addr;

  if ( argc != 3 ) {
    fprintf( stderr, "usage: client hostip localport\n" );
    exit( 1 );
  }

  if ( ( localport = atoi( argv[ 2 ] ) ) == 0 )
    {
      fprintf( stderr, "ERROR: localport should be an "\
	       "integer, '%s' was given.\n", argv[ 2 ] ); 
      exit( 1 );
    }

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

  my_addr.sin_family      = AF_INET;
  my_addr.sin_port        = htons( localport );
  my_addr.sin_addr.s_addr = INADDR_ANY;
  memset( &( my_addr.sin_zero ), '\0', 8 );

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


  their_addr.sin_family = AF_INET;
  their_addr.sin_port = htons( PORT );
  if ( inet_pton( AF_INET, argv[ 1 ], 
		  &their_addr.sin_addr ) <= 0 ) 
    {
      perror( "inet_pton" );
      exit( 1 );
    }
  memset( &( their_addr.sin_zero ), '\0', 8 );

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

  {
    struct sockaddr_in name;
    int sin_size = sizeof( struct sockaddr_in );
    if ( getsockname( sockfd, (struct sockaddr *) &name,
		      &sin_size ) == -1 )
      {
	perror( "getsockname" );
	exit( 1 );
      }

    printf( "client: connected using local %s:%d\n",
	    inet_ntoa( name.sin_addr ), ntohs( name.sin_port));
    
  }
  

  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) */