FTPD(8N)                COMMAND REFERENCE                FTPD(8N)



NAME
     ftpd - DARPA Internet File Transfer Protocol server

SYNOPSIS
     /etc/ftpd [ -d ] [ -l ] [ -ttimeout ]

DESCRIPTION
     Ftpd is the DARPA Internet File Transfer Prototocol server
     process.  The server uses the TCP protocol and is started by
     inetd(8n) when a connection is made on the port specified in
     the ftp service specification; see services(5n).

     The ftp server currently supports the following ftp
     requests;  case is not distinguished.

          Request        Description
          ABOR           abort transfer in progress
          ACCT           specify account (ignored)
          ALLO           allocate storage (vacuously)
          APPE           append to a file
          CWD            change working directory
          DELE           delete a file
          HELP           give help information
          LIST           give list files in a directory (``ls -lg'')
          MODE           specify data transfer mode
          NLST           give name list of files in directory (``ls'')
          NOOP           do nothing
          PASS           specify password
          PORT           specify data connection port
          QUIT           terminate session
          RETR           retrieve a file
          RNFR           specify rename-from file name
          RNTO           specify rename-to file name
          STAT           status of transfer, server or file
          STOR           store a file
          STRU           specify data transfer structure
          TYPE           specify data transfer type
          USER           specify user name
          XCUP           change to parent of current working directory
          XCWD           change working directory
          XMKD           make a directory
          XPWD           print the current working directory
          XRMD           remove a directory

     The remaining ftp requests specified in Internet RFC 765 are
     recognized, but not implemented.

     A data transfer may be aborted or stated by sending the
     telnet chars IAC IP and out of band data message, followed
     by the ABOR or STAT command.





Printed 4/6/89                                                  1

FTPD(8N)                COMMAND REFERENCE                FTPD(8N)



     Ftpd interprets file names according to the ``globbing''
     conventions used by csh(1csh).  This allows users to utilize
     the metacharacters * ? [ ] { } ~ .

     Ftpd authenticates users according to three rules.

          1.The user name must be in the password data base,
            /etc/passwd, and not have a null password.  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.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 ftp 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 commands.  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 work
            properly.  These files should be mode 444.

     ~ftp/pub
            Make this directory mode 777 and owned by ftp.  Users
            should then place files which are to be accessible
            via the anonymous account in this directory.

OPTIONS
     -d  Each socket created will have debugging turned on
         (SO_DEBUG).  With debugging enabled, the system will
         trace all TCP packets sent and received on a socket.




Printed 4/6/89                                                  2

FTPD(8N)                COMMAND REFERENCE                FTPD(8N)



     -l  Each ftp session is logged on the standard output.  This
         allows a line of the form /etc/ftpd -l > /tmp/ftplog to
         be used to conveniently maintain a log of ftp sessions.

-ttimeout
         Set the inactivity timeout period to timeout.  By
         default the ftp server will timeout an inactive session
         after 60 seconds.

RETURN VALUE
     [0]            Ftpd is running.

     [1]            Ftpd is not running.

CAVEATS
     The anonymous account is inherently dangerous and should
     avoided when possible.

     The server must run as the super-user to create sockets with
     privileged port numbers.  It maintains an effective user ID
     of the logged in user, reverting to the super-user only when
     binding addresses to sockets.

SEE ALSO
     ftp(1n) and inetd(8n).






























Printed 4/6/89                                                  3

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