vsftpd的日志格式

current-time    The current local time in the form "DDD MMM dd hh:mm:ss YYYY"　　　　##当前时间

transfer-time   The total time of the transfer in seconds.　　　　##传输该文件消耗的时间

remote-host     The remote host name.　　　　## 远程主机（客户端）的主机名

byte-count      The amount of transferred bytes.　　　　## 传输文件的大小

filename     The canonicalized (all symbolic links are resolved) absolute pathname of the transferred file.　　　　## 传输文件的绝对路径

transfer-type   The single character that indicates the type of the transfer. The set of possible values is:　　　　## 传输文件的类型。有普通文件和二进制文件

    a  An ascii transfer.

    b  A binary transfer.

special-action-flag　　　　　　　　　　　　　　　　　　　　                ## 特殊的动作标记，

    _  No action was taken                                          ## 没有特殊动作

    C  The file was compressed (not in use).                        ## 文件被压缩了

    U  The file was uncompressed (not in use).                      ## 文件没有被压缩

    T  The file was tar‘ed (not in use).                            ## 文件是个tar包

direction     The direction of the transfer. The set of possible values  is:

    o  The outgoing transfer.                                                       ## 对外传输，客户端下载文件

    i  The incoming transfer.                                                       ## 对内传输，客户端上传文件

access-mode     The method by which the user is logged in. The set of possible values is:             ## 登录服务的用户属性

    a (anonymous)  The anonymous guest user.                        ## 匿名用户

    g (guest)    The real but chrooted user (this capability  is guided by ftpchroot(5) file).       ## 系统用户但是被chroot了

    r (real)    The real user.                                                                       ## 系统用户

username                       ## 真实的用户名

service-name                   ## 服务名

authentication-method                               ## 认证方式

    0  None.                                        ## 未做任何认证

    1  RFC931 Authentication (not in use).  

authenticated-user-id                              ## 返回的user id，如果用户认证时的user id不可用，将以“*”号显示


completion-status                                   ## 传输完成与否的状态 ，c 表示传输完成，i 表示传输未完成
    c  A complete transfer.

    i  An incomplete transfer.