tftpd(8)                            CLIX                            tftpd(8)



  NAME

    tftpd - Runs DARPA tftp server

  SYNOPSIS

    /usr/ip32/tcpip/tftpd [-d] [-s] [-v] [-w] [-l logfile]

  FLAGS

    -d           Allows tftpd to be a boot server for diskless workstations.
                 If the filename passed on a read request contains no
                 pathname, tftpd searches for it in the /tftpboot directory.

    -s           Places tftpd in secure mode.  When in secure mode, tftpd
                 allows read-only access only to the /tftpboot directory.

    -v           Outputs tftpd version number to stderr or the log file
                 specified with the -l flag.

    -w           Write-restricts tftpd.  In write-restrict mode tftpd refuses
                 all requests to write files to the tftpd host.

    -l logfile   Logs messages to the specified logfile instead of stderr.

  DESCRIPTION

    The tftpd server supports the Defense Advanced Research Project Agency
    (DARPA) Trivial File Transfer Protocol (TFTP).  The tftpd command process
    acts as both a listener and a server.  When the tftpd listener receives a
    connection request, a copy of the tftpd server is spawned to handle the
    request.

    The tftpd server operates at the port indicated by the tftp service listed
    in the /etc/services file.

    The tftp service does not require an account or password on the remote
    system.  Due to the lack of authentication information, tftpd allows only
    publicly readable files to be accessed.  Files may be written only if they
    exist and are publicly writable.  Note that this extends the concept of
    ``public'' to include all users on all hosts that can be reached through
    the network.  This may not be appropriate on all systems and its
    implications should be considered before enabling the tftp service.

    For valid write requests, the destination file is not overwritten until
    the data is transferred in its entirety to a temporary location on the
    disk.  Therefore, the necessary additional space must be available on disk
    for the transfer to be successful.  If any error occurs before the
    transfer is complete, the destination file retains its original form and
    the temporary file is erased.




  2/94 - Intergraph Corporation                                              1

  tftpd(8)                            CLIX                            tftpd(8)



  EXAMPLES

    1.  To start the tftpd daemon without the optional flags, enter:

        /usr/ip32/tcpip/tftpd


    2.  To start the tftpd daemon in verbose mode with messages and version
        number printed to the logfile file.log enter:

        /usr/ip32/tcpip/tftpd -v -w -l file.log

        The -w flag provides protection for secure stations by write-
        restricting tftpd.

    3.  To start the tftpd daemon as a server to boot diskless workstations,
        enter:

        /usr/ip32/tcpip/tftpd -d

        The -d flag allows tftpd to search the /tftpboot directory for nonpath
        files requested by diskless workstations.  If read-only access with
        tftpd is desired, the -w flag is used also.

    4.  To start the tftpd daemon in secure mode so that only files in
        /tftpboot can be accessed in read-only mode, enter:

        /usr/ip32/tcpip/tftpd -s


  DIAGNOSTICS

    Error messages are displayed on stderr by default, or to a log file if the
    -l flag is used.

    All messages are prepended with tftpd:.  These messages occur on
    connection, read, or write errors.

  EXIT VALUES

    If an error occurs, the tftpd server exits with a nonzero value.
    Otherwise, the tftpd server exits with a zero status, while the tftpd
    listener continues listening for other connection requests.

  RELATED INFORMATION

    Commands:  tftp(1)

    Files:  services(4)





  2                                              Intergraph Corporation - 2/94