Request Description


ABOR abort previous command


ACCT specify account (ignored)


ALLO allocate storage (vacuously)


APPE append to a file


CDUP change to parent of current working directory


CWD change working directory


DELE delete a file


HELP give help information


LIST give list files in a directory (``ls -lgA'')


MKD make a directory


MDTM show last modification time of file


MODE specify data transfer mode


NLST give name list of files in directory 


NOOP do nothing


PASS specify password


PASV prepare for server-to-server transfer


PORT specify data connection port


PWD print the current working directory


QUIT terminate session


REST restart incomplete transfer


RETR retrieve a file


RMD remove a directory


RNFR specify rename-from file name


RNTO specify rename-to file name


SITE non-standard commands (see next section)


SIZE return size of file


STAT return status of server


STOR store a file


STOU store a file with a unique name


STRU specify data transfer structure


SYST show operating system type of server system


TYPE specify data transfer type


USER specify user name


XCUP change to parent of current working directory (deprecated)


XCWD change working directory (deprecated)


XMKD make a directory (deprecated)


XPWD print the current working directory (deprecated)


XRMD remove a directory (deprecated)


 

  


 The following non-standard or UNIX specific commands are supported


by the SITE request.


 

  


 

Request Description


UMASK change umask. E.g. SITE UMASK 002


IDLE set idle-timer. E.g. SITE IDLE 60


CHMOD change mode of a file. E.g. SITE CHMOD 755 filename


HELP give help information. E.g. SITE HELP


NEWER list files newer than a particular date


MINFO like SITE NEWER, but gives extra information


GROUP request special group access. E.g. SITE GROUP foo


GPASS give special group access password. E.g. SITE GPASS bar


EXEC execute a program.  E.g. SITE EXEC program params


 

  


 The remaining ftp requests specified in Internet RFC 959 are


recognized, but not implemented.


MDTM and SIZE are not specified in


RFC 959, but will appear in the next updated FTP RFC.


 

  


 The ftp server will abort an active file transfer only when the


ABOR command is preceded by a Telnet "Interrupt Process" (IP)


signal and a Telnet "Synch" signal in the command Telnet stream,


as described in Internet RFC 959.


If a STAT command is received during a data transfer, preceded by a Telnet IP


and Synch, transfer status will be returned.


 

  


   Ftpd

 interprets file names according to the ``globbing''


conventions used by


  csh(1) .

 This allows users to utilize the metacharacters ``*?[]{}~''.


 

  


   Ftpd

 authenticates users according to four rules. 


  1) 
 The user name must be in the password data base,


  /etc/passwd ,

 or whatever is appropriate for the operating system,


and the password must not be null.  In this case a password


must be provided by the client before any file operations


may be performed.


 
 
  2) 
 The user name must not appear in the file


  /etc/ftpusers .

 
 
 
  3) 
 The user must have a standard shell returned by 


  getusershell(3) .

 
 
 
  4) 
 If the user name is ``anonymous'' or ``ftp'', an


anonymous ftp account must be present in the password


file (user ``ftp'').  In this case the user is allowed


to log in by specifying any password (by convention this


is given as the client host's name).


 

  


 In the last case, 


  ftpd

 takes special measures to restrict the client's access privileges.


The server performs a 


  chroot(2) 

 command to the home directory of the ``ftp'' user.


In order that system security is not breached, it is recommended


that the ``ftp'' subtree be constructed with care;  the following


rules are recommended.


 
 
  ~ftp) 
 Make the home directory owned by super-user and unwritable by anyone.


 
 
  ~ftp/bin) 
 Make this directory owned by the super-user and unwritable by


anyone.  The program


  ls(1) 

 must be present to support the list command.  This


program should have mode 111.


 
 
  ~ftp/etc) 
 Make this directory owned by the super-user and unwritable by


anyone.  The files


  passwd(5) 

 and


  group(5) 

 must be present for the 


  ls

 command to be able to produce owner names rather than numbers. Depending


on the operating system, there may be other required files. Check your


manual page for the 


  getpwent(3) 

 library routine.


The password field in


  passwd

 is not used, and should not contain real encrypted passwords.


These files should be mode 444 and owned by the super-user.


Don't use the system's /etc/passwd file as the password file or


the system's /etc/group file as the group file in the ~ftp/etc directory.


 
 
  ~ftp/pub) 
 Create a subdirectory in ~ftp/pub


with the appropriate mode (777 or 733) if you want to allow normal


users to upload files.


 

  


 
 
 

 True Filename  Specified Filename  Action
 -------------  ------------------  -----------------------------------
 <filename>.Z   <filename>          Decompress file before transmitting
 <filename>     <filename>.Z        Compress <filename> before 
                                            transmitting
 <filename>     <filename>.tar      Tar <filename> before transmitting
 <filename>     <filename>.tar.Z    Tar and compress <filename> before
                                            transmitting

Mon Dec  3 18:52:41 1990 1 wuarchive.wustl.edu 568881 /files.lst.Z a _ o a chris@wugate.wustl.edu ftp 0 *

  %.24s %d %s %d %s %c %s %c %c %s %s %d %s
    1   2  3  4  5  6  7  8  9  10 11 12 13

  1 current time in the form DDD MMM dd hh:mm:ss YYYY
  2 transfer time in seconds
  3 remote host name
  4 file size in bytes
  5 name of file
  6 transfer type (a>scii, b>inary)
  7 special action flags (concatenated as needed):
        C   file was compressed
        U   file was uncompressed
        T   file was tar'ed
        _   no action taken
  8 file was sent to user (o>utgoing) or received from 
    user (i>ncoming)
  9 accessed anonymously (r>eal, a>nonymous, g>uest) -- mostly for FTP
 10 local username or, if guest, ID string given 
    (anonymous FTP password)
 11 service name ('ftp', other)
 12 authentication method (bitmask)
        0   none
        1   RFC931 Authentication
 13 authenticated user id (if available, '*' otherwise)