ftpd(1M)                        TCP/IP 5.4.2                        ftpd(1M)


NAME
       ftpd - File Transfer Protocol server

SYNOPSIS
       /usr/bin/ftpd [ -d ] [ -l ] [ -ttimeout ]

DESCRIPTION
       The ftpd process is the DARPA Internet File Transfer Prototocol (FTP)
       server process.  The server uses the Transmission Control Protocol
       (TCP) as its transport protocol.  The FTP server is invoked by the
       inetd server when an incoming connection is detected on the port
       specified in /etc/services.  See inetd(1M) and services(4) for
       details.

   Options
       -d     Enable debugging, with output going to /tmp/ftpd*.

       -l     Log each FTP session to the system log.  For details about the
              system log, see syslog(3C).

       -ttimeout
              Set the inactivity time-out period to timeout seconds.  By
              default, the FTP server does not time out an inactive session.

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

       Request        Description
       ABOR           abort any transfer in progress
       ACCT           specify account (ignored)
       ALLO           allocate storage
       APPE           append to a file
       CDUP           change to the parent of the current working directory
       CWD            change working directory
       DELE           delete a file
       HELP           give help information
       LIST           give list of files in a directory (ls -l)
       MKD            make a directory
       MODE           specify data transfer mode
       NLST           give list of names of files in directory (ls)
       NOOP           do nothing
       PAGE           specify a new page size
       PASS           specify password
       PASV           listen on a data port and wait for a connection
       PORT           specify data connection port
       PWD            print the current working directory
       QUIT           terminate session
       REIN           reinitialize server state
       REST           restart the last aborted transfer
       RETR           retrieve a file
       RMD            remove a directory
       RNFR           specify rename-from filename
       RNTO           specify rename-to filename



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ftpd(1M)                        TCP/IP 5.4.2                        ftpd(1M)


       SEOR           specify a new end-of-record delimiter
       SITE           display any information specific to the remote system
       STAT           display server's status
       STOR           store a file
       STOU           store a file under a unique name
       STRU           specify data transfer structure
       TYPE           specify data transfer type
       USER           specify username
       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 ftpd process interprets filenames according to the "globbing"
       conventions used by csh(1).  This allows you to use the
       metacharacters ``*?[]{}~''.

   User Authentication Rules
       The ftpd process authenticates users according to three rules:

       1)     The username must be in the password database, /etc/passwd,
              or, if you use the Network Information Service, it must be in
              the Network Information Service password database.  If a
              password is required for a given username, it must be provided
              by the client process before any file operations can be
              performed.

       2)     The username must not be in the /etc/ftpd.deny file.  If the
              username is in this file, ftp access is denied to the user.

       3)     If the username is anonymous or ftp, an anonymous ftp login
              must be specified in the password file (user ftp).  In this
              case, a user is allowed to log in by specifying any password
              (by convention, this is given as the client hostname).

       In the third case, ftpd takes special measures to restrict the
       client's access privileges.  The server performs a chroot(1M) command
       to the home directory of the ftp user.  So that system security is
       not breached, it is recommended that the ftp subtree be constructed
       with care.  The following guidelines are recommended.

       ~ftp           Make the home directory owned by ftp and unwritable by
                      anyone.

       ~ftp/bin       Make this directory owned by the superuser and
                      unwritable by anyone.  The programs ls(1) and pwd(1)
                      must be present to support the list and print
                      directory commands.  These programs should have mode
                      111.

       ~ftp/etc       Make this directory owned by the superuser and
                      unwritable by anyone.  The file group(4) must be
                      present for the ls command to work properly.  This



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ftpd(1M)                        TCP/IP 5.4.2                        ftpd(1M)


                      file should be mode 444.

       ~ftp/pub       To provide public filespace, create this directory
                      with mode 777 and owned by ftp.  Users should then put
                      in this directory all files that are to be accessible
                      through the anonymous account.

SEE ALSO
       ftp(1C), inetd(1M), ftpd.deny(4).

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










































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