view/trunk/ftp_open.c

/*
  liboftp: this is an FTP library to simplify the work to a Developer
  who want to work with FTP servers (RFC 959).

  Copyright (c) 2009 hirohito higashi. All rights reserved.
  This file is distributed under BSD license.
*/


/***** Feature test switches ************************************************/
/***** System headers *******************************************************/
#include <string.h>
#include <sys/time.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>


/***** Local headers ********************************************************/
#include "liboftp.h"
#include "sub.h"


/***** Constat values *******************************************************/
/***** Macros ***************************************************************/
/***** Typedefs *************************************************************/
/***** Function prototypes **************************************************/
/***** Local variables ******************************************************/
/***** Global variables *****************************************************/
/***** Signal catching functions ********************************************/
/***** Local functions ******************************************************/
/***** Global functions *****************************************************/

/****************************************************************************/
/*! ftp������������������
 *
 *@param        ftp     LIBOFTP���������������������
 *@param        host    ������������������������IP������������������������
 *@param        port    ���������������������������������������������������������������
 *@retval       int     ������������������
 *@note
 * ftp������������������������������������������
 */
int ftp_connect( LIBOFTP *ftp, const char *host, int port )
{
    struct hostent *p_hostent;
    struct timeval tval;

    /*
     * initialize
     */
    memset( ftp, 0, sizeof( LIBOFTP ) );
    ftp->timeout_sec = 10;                      /* default timeout */
    if( port == 0 ) port = 21;

    /*
     * search host entry
     */
    p_hostent = gethostbyname( host );
    if( p_hostent == NULL ) {
        ftp->error_no = h_errno;
        return -1;
    }
    ftp->sockaddr.sin_family = AF_INET;
    memcpy( &ftp->sockaddr.sin_addr, p_hostent->h_addr, p_hostent->h_length );
    ftp->sockaddr.sin_port = htons( port );

    /*
     * make control connection.
     */
    ftp->socket = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP );
    if( ftp->socket < 0 ) {
        ftp->error_no = errno;
        return -2;
    }

    if( connect( ftp->socket, (struct sockaddr *)&(ftp->sockaddr), sizeof(struct sockaddr) ) < 0 ) {
        ftp->error_no = errno;
        return -3;
    }

    tval.tv_sec = ftp->timeout_sec;
    tval.tv_usec = 0;
    if( setsockopt( ftp->socket, SOL_SOCKET, SO_SNDTIMEO, &tval, sizeof(struct timeval) ) < 0 ) {
        ftp->error_no = errno;
        return -4;
    }
    if( setsockopt( ftp->socket, SOL_SOCKET, SO_RCVTIMEO, &tval, sizeof(struct timeval) ) < 0 ) {
        ftp->error_no = errno;
        return -5;
    }

    if( ftp_receive_response( ftp, 0, 0 ) != 220 ) {            /* 220: Service ready for new user. */
        return -7;
    }

    return 0;
}
