FTP Commands and Extensions

Created

2010-01-07

Last Updated

2010-03-11

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• FTP Commands and Extensions

FTP Commands and Extensions

Reference

[RFC5797]

Note

    Note: An IESG Standards Action is allowed to direct IANA to change the
    Conformance Requirements listed for any entry. 
    
    The following commands are part of the base FTP specification
    [RFC0959] and are listed in the registry with the immutable pseudo
    FEAT code "base".
    
    Mandatory commands:
    
    ABOR, ACCT, ALLO, APPE, CWD, DELE, HELP, LIST, MODE, NLST, NOOP,
    PASS, PASV, PORT, QUIT, REIN, REST, RETR, RNFR, RNTO, SITE, STAT,
    STOR, STRU, TYPE, USER
    
    Optional commands:
    
    CDUP, MKD, PWD, RMD, SMNT, STOU, SYST
    
    Note: STD 3 [RFC1123] clarified and updated the status and
    implementation requirements of these standard FTP commands, and it
    contains important complementary information for the following
    commands:
    
    LIST, NLST, PASV, REST, SITE, STOU
  
    The following commands were specified as experimental in an extension
    to an early version of the FTP specification [RFC0775] but later
    deprecated by RFC 1123 [RFC1123], because Standard FTP [RFC0959]
    specifies their standard successors.  They are listed in the registry
    with the immutable pseudo FEAT code "hist".
  
    XCUP, XCWD, XMKD, XPWD, XRMD
  
    Implementation note:  Deployed FTP clients still make use of the
    deprecated commands and most FTP servers support them as aliases
    for the standard commands.
  
    The following commands were specified as part of the "FOOBAR" IPng
    effort in RFC 1545 [RFC1545] and, later, RFC 1639 [RFC1639] and are
    now obsolete.  They are listed in the registry with the immutable
    pseudo FEAT code "hist".
  
    LPRT, LPSV

    Legend for the registry:

        o  cmd (Command Name)

            Amended versions of commands are tagged with a trailing "+"

        o  FEAT Code

            Keyword returned in FEAT response line for this command/extension:

             - actual FEAT codes are given in upper case
             - placeholders (pseudo FEAT codes) are shown in lower case
             - "-N/A-" indicates a feature not related to one particular command

            See the "Extension name" clause in Section 2.2 of
            [RFC5797] for details.

        o  description

            Brief description of command / extension

        o  type (Command Type)

            Type or "kind" of command, based on Section 4.1 of [RFC959]:

             'a'  ... access control
             'p'  ... parameter setting
             's'  ... service execution

            Combinations like 'p/s' are possible.

        o  conf (Conformance Requirements)

            Expectation for support in modern FTP implementations:

             'm'  ... mandatory to implement
             'o'  ... optional
             'h'  ... historic
  

Footnotes

While an IETF Standards Action would be required to make the FEAT
mechanism [RFC2389] mandatory, implementation of that extension
mechanism is clearly required in conjunction with any extension or
feature that depends on it.

FEAT String for RFC 4217: AUTH TLS
FEAT String for RFC 2773: AUTH KEA-SKIPJACK

FEAT String: REST STREAM

FEAT String: TYPE {semicolon-separated list of supported types}