ftp.c

uclinux 下的vlc播放器源代码

    }
    else
    {
        ftp_ReadCommand( p_access, NULL, NULL );
    }
    net_Close( p_sys->fd_cmd );

    /* free memory */
    vlc_UrlClean( &p_sys->url );
    free( p_sys );
}

/*****************************************************************************
 * Seek: try to go at the right place
 *****************************************************************************/
static int Seek( access_t *p_access, int64_t i_pos )
{
    if( i_pos < 0 )
    {
        return VLC_EGENERIC;
    }
    msg_Dbg( p_access, "seeking to "I64Fd, i_pos );

    ftp_StopStream( p_access );
    if( ftp_StartStream( p_access, i_pos ) < 0 )
    {
        p_access->info.b_eof = VLC_TRUE;
        return VLC_EGENERIC;
    }

    p_access->info.b_eof = VLC_FALSE;
    p_access->info.i_pos = i_pos;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Read:
 *****************************************************************************/
static int Read( access_t *p_access, uint8_t *p_buffer, int i_len )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i_read;

    if( p_access->info.b_eof )
        return 0;

    i_read = net_Read( p_access, p_sys->fd_data, NULL, p_buffer, i_len,
                       VLC_FALSE );
    if( i_read == 0 )
        p_access->info.b_eof = VLC_TRUE;
    else if( i_read > 0 )
        p_access->info.i_pos += i_read;

    return i_read;
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
    vlc_bool_t   *pb_bool;
    int          *pi_int;
    int64_t      *pi_64;
    vlc_value_t  val;

    switch( i_query )
    {
        /* */
        case ACCESS_CAN_SEEK:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_TRUE;
            break;
        case ACCESS_CAN_FASTSEEK:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_FALSE;
            break;
        case ACCESS_CAN_PAUSE:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_TRUE;    /* FIXME */
            break;
        case ACCESS_CAN_CONTROL_PACE:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_TRUE;    /* FIXME */
            break;

        /* */
        case ACCESS_GET_MTU:
            pi_int = (int*)va_arg( args, int * );
            *pi_int = 0;
            break;

        case ACCESS_GET_PTS_DELAY:
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            var_Get( p_access, "ftp-caching", &val );
            *pi_64 = (int64_t)var_GetInteger( p_access, "ftp-caching" ) * I64C(1000);
            break;

        /* */
        case ACCESS_SET_PAUSE_STATE:
            /* Nothing to do */
            break;

        case ACCESS_GET_TITLE_INFO:
        case ACCESS_SET_TITLE:
        case ACCESS_SET_SEEKPOINT:
        case ACCESS_SET_PRIVATE_ID_STATE:
            return VLC_EGENERIC;

        default:
            msg_Warn( p_access, "unimplemented query in control" );
            return VLC_EGENERIC;

    }
    return VLC_SUCCESS;
}

/*****************************************************************************
 * ftp_*:
 *****************************************************************************/
static int ftp_SendCommand( access_t *p_access, char *psz_fmt, ... )
{
    access_sys_t *p_sys = p_access->p_sys;
    va_list      args;
    char         *psz_cmd;

    va_start( args, psz_fmt );
    vasprintf( &psz_cmd, psz_fmt, args );
    va_end( args );

    msg_Dbg( p_access, "ftp_SendCommand:\"%s\"", psz_cmd);
    if( net_Printf( VLC_OBJECT(p_access), p_sys->fd_cmd, NULL, "%s\r\n",
                    psz_cmd ) < 0 )
    {
        msg_Err( p_access, "failed to send command" );
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

/* TODO support this s**t :
 RFC 959 allows the client to send certain TELNET strings at any moment,
 even in the middle of a request:

 * \377\377.
 * \377\376x where x is one byte.
 * \377\375x where x is one byte. The server is obliged to send \377\374x
 *                                immediately after reading x.
 * \377\374x where x is one byte.
 * \377\373x where x is one byte. The server is obliged to send \377\376x
 *                                immediately after reading x.
 * \377x for any other byte x.

 These strings are not part of the requests, except in the case \377\377,
 where the request contains one \377. */
static int ftp_ReadCommand( access_t *p_access,
                            int *pi_answer, char **ppsz_answer )
{
    access_sys_t *p_sys = p_access->p_sys;
    char         *psz_line;
    int          i_answer;

    psz_line = net_Gets( p_access, p_sys->fd_cmd, NULL );
    msg_Dbg( p_access, "answer=%s", psz_line );
    if( psz_line == NULL || strlen( psz_line ) < 3 )
    {
        msg_Err( p_access, "cannot get answer" );
        if( psz_line ) free( psz_line );
        if( pi_answer ) *pi_answer    = 500;
        if( ppsz_answer ) *ppsz_answer  = NULL;
        return -1;
    }

    if( psz_line[3] == '-' )    /* Multiple response */
    {
        char end[4];

        memcpy( end, psz_line, 3 );
        end[3] = ' ';

        for( ;; )
        {
            char *psz_tmp = net_Gets( p_access, p_sys->fd_cmd, NULL );

            if( psz_tmp == NULL )   /* Error */
                break;

            if( !strncmp( psz_tmp, end, 4 ) )
            {
                free( psz_tmp );
                break;
            }
            free( psz_tmp );
        }
    }

    i_answer = atoi( psz_line );

    if( pi_answer ) *pi_answer = i_answer;
    if( ppsz_answer )
    {
        *ppsz_answer = psz_line;
    }
    else
    {
        free( psz_line );
    }
    return( i_answer / 100 );
}

static int ftp_StartStream( access_t *p_access, off_t i_start )
{
    access_sys_t *p_sys = p_access->p_sys;

    char psz_ipv4[16], *psz_ip;
    int  i_answer;
    char *psz_arg, *psz_parser;
    int  i_port;

    psz_ip = p_sys->sz_epsv_ip;

    if( ( ftp_SendCommand( p_access, *psz_ip ? "EPSV" : "PASV" ) < 0 )
     || ( ftp_ReadCommand( p_access, &i_answer, &psz_arg ) != 2 ) )
    {
        msg_Err( p_access, "cannot set passive mode" );
        return VLC_EGENERIC;
    }

    psz_parser = strchr( psz_arg, '(' );
    if( psz_parser == NULL )
    {
        free( psz_arg );
        msg_Err( p_access, "cannot parse passive mode response" );
        return VLC_EGENERIC;
    }

    if( psz_ip != NULL )
    {
        char psz_fmt[7] = "(|||%u";
        psz_fmt[1] = psz_fmt[2] = psz_fmt[3] = psz_parser[1];

        if( sscanf( psz_parser, psz_fmt, &i_port ) < 1 )
        {
            free( psz_arg );
            msg_Err( p_access, "cannot parse passive mode response" );
            return VLC_EGENERIC;
        }
    }
    else
    {
        unsigned  a1, a2, a3, a4, p1, p2;

        if( ( sscanf( psz_parser, "(%u,%u,%u,%u,%u,%u", &a1, &a2, &a3, &a4,
                      &p1, &p2 ) < 6 ) || ( a1 > 255 ) || ( a2 > 255 )
         || ( a3 > 255 ) || ( a4 > 255 ) || ( p1 > 255 ) || ( p2 > 255 ) )
        {
            free( psz_arg );
            msg_Err( p_access, "cannot parse passive mode response" );
            return VLC_EGENERIC;
        }

        sprintf( psz_ipv4, "%u.%u.%u.%u", a1, a2, a3, a4 );
        psz_ip = psz_ipv4;
        i_port = (p1 << 8) | p2;
    }
    free( psz_arg );

    msg_Dbg( p_access, "ip:%s port:%d", psz_ip, i_port );

    if( ftp_SendCommand( p_access, "TYPE I" ) < 0 ||
        ftp_ReadCommand( p_access, &i_answer, NULL ) != 2 )
    {
        msg_Err( p_access, "cannot set binary transfer mode" );
        return VLC_EGENERIC;
    }

    if( i_start > 0 )
    {
        if( ftp_SendCommand( p_access, "REST "I64Fu, i_start ) < 0 ||
            ftp_ReadCommand( p_access, &i_answer, NULL ) > 3 )
        {
            msg_Err( p_access, "cannot set restart point" );
            return VLC_EGENERIC;
        }
    }

    msg_Dbg( p_access, "waiting for data connection..." );
    p_sys->fd_data = net_ConnectTCP( p_access, psz_ip, i_port );
    if( p_sys->fd_data < 0 )
    {
        msg_Err( p_access, "failed to connect with server" );
        return VLC_EGENERIC;
    }
    msg_Dbg( p_access, "connection with \"%s:%d\" successful",
             psz_ip, i_port );

    /* "1xx" message */
    if( ftp_SendCommand( p_access, "RETR %s", p_sys->url.psz_path ) < 0 ||
        ftp_ReadCommand( p_access, &i_answer, NULL ) > 2 )
    {
        msg_Err( p_access, "cannot retreive file" );
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}

static int ftp_StopStream ( access_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;

    int i_answer;

    if( ftp_SendCommand( p_access, "ABOR" ) < 0 )
    {
        msg_Warn( p_access, "cannot abort file" );
        if(  p_sys->fd_data > 0 )
            net_Close( p_sys->fd_data );
        p_sys->fd_data = -1;
        return VLC_EGENERIC;
    }
    if(  p_sys->fd_data > 0 )
    {
        net_Close( p_sys->fd_data );
        p_sys->fd_data = -1;
        ftp_ReadCommand( p_access, &i_answer, NULL );
    }
    ftp_ReadCommand( p_access, &i_answer, NULL );

    return VLC_SUCCESS;
}