Ubuntu Manpage: ftpd - Tcl FTP server implementation

NAME

       ftpd - Tcl FTP server implementation

SYNOPSIS

       package require Tcl  8.3

       package require ftpd  ?1.2.6?

       ::ftpd::server ?myaddr?

       ::ftpd::config ?option value? ?option value ...?

       fsCmd append path

       fsCmd delete path channel

       fsCmd dlist path style channel

       fsCmd exists path

       fsCmd mkdir path channel

       fsCmd mtime path channel

       fsCmd permissions path

       fsCmd rename path newpath channel

       fsCmd retr path

       fsCmd rmdir path channel

       fsCmd size path channel

       fsCmd store path

_________________________________________________________________

DESCRIPTION

       The  ftpd  package  provides  a  simple  Tcl-only  server  library for the FTP protocol as
       specified in RFC 959 (http://www.rfc-editor.org/rfc/rfc959.txt).  It works by listening on
       the  standard  FTP  socket.   Most  server  errors are returned as error messages with the
       appropriate code attached to them.  Since the server code for the ftp daemon  is  executed
       in the event loop, it is possible that a bgerror will be thrown on the server if there are
       problems with the code in the module.

COMMANDS

::ftpd::server ?myaddr?
Open a listening socket to listen to and accept ftp connections. myaddr is an
optional argument. myaddr is the domain-style name or numerical IP address of the
client-side network interface to use for the connection.

::ftpd::config ?option value? ?option value ...?
The value is always the name of the command to call as the callback. The option
specifies which callback should be configured. See section CALLBACKS for
descriptions of the arguments and return values for each of the callbacks.

-authIpCmd proc
Callback to authenticate new connections based on the ip-address of the
peer.

-authUsrCmd proc
Callback to authenticate new connections based on the user logging in (and
the users password).

-authFileCmd proc
Callback to accept or deny a users access to read and write to a specific
path or file.

-logCmd proc
Callback for log information generated by the FTP engine.

-fsCmd proc
Callback to connect the engine to the filesystem it operates on.

-closeCmd proc
Callback to be called when a connection is closed. This allows the embedding
application to perform its own cleanup operations.

-xferDoneCmd proc
Callback for transfer completion notification. In other words, it is called
whenever a transfer of data to or from the client has completed.

CALLBACKS

authIpCmd callback
The authIpCmd receives the ip-address of the peer attempting to connect to the ftp
server as its argument. It returns a 1 to allow users from the specified IP to
attempt to login and a 0 to reject the login attempt from the specified IP.

authUsrCmd callback
The authUsrCmd receives the username and password as its two arguments. It returns
a 1 to accept the attempted login to the ftpd and a 0 to reject the attempted
login.

authFileCmd callback
The authFileCmd receives the user (that is currently logged in), the path or
filename that is about to be read or written, and read or write as its three
arguments. It returns a 1 to allow the path or filename to be read or written, and
a 0 to reject the attempted read or write with a permissions error code.

logCmd callback
The logCmd receives a severity and a message as its two arguments. The severities
used within the ftpd package are note, debug, and error. The logCmd doesn't return
anything.

fsCmd callback
The fsCmd receives a subcommand, a filename or path, and optional additional
arguments (depending on the subcommand).

The subcommands supported by the fsCmd are:

fsCmd append path
The append subcommand receives the filename to append to as its argument. It
returns a writable tcl channel as its return value.

fsCmd delete path channel
The delete subcommand receives the filename to delete, and a channel to
write to as its two arguments. The file specified is deleted and the
appropriate ftp message is written to the channel that is passed as the
second argument. The delete subcommand returns nothing.

fsCmd dlist path style channel
The dlist subcommand receives the path that it should list the files that
are in, the style in which the files should be listed which is either nlst
or list, and a channel to write to as its three arguments. The files in the
specified path are printed to the specified channel one per line. If the
style is nlst only the name of the file is printed to the channel. If the
style is list then the file permissions, number of links to the file, the
name of the user that owns the file, the name of the group that owns the
file, the size (in bytes) of the file, the modify time of the file, and the
filename are printed out to the channel in a formatted space separated
format. The dlist subcommand returns nothing.

fsCmd exists path
The exists subcommand receives the name of a file to check the existence of
as its only argument. The exists subcommand returns a 1 if the path
specified exists and the path is not a directory.

fsCmd mkdir path channel
The mkdir subcommand receives the path of a directory to create and a
channel to write to as its two arguments. The mkdir subcommand creates the
specified directory if necessary and possible. The mkdir subcommand then
prints the appropriate success or failure message to the channel. The mkdir
subcommand returns nothing.

fsCmd mtime path channel
The mtime subcommand receives the path of a file to check the modify time on
and a channel as its two arguments. If the file exists the mtime is printed
to the channel in the proper FTP format, otherwise an appropriate error
message and code are printed to the channel. The mtime subcommand returns
nothing.

fsCmd permissions path
The permissions subcommand receives the path of a file to retrieve the
permissions of. The permissions subcommand returns the octal file
permissions of the specified file. The file is expected to exist.

fsCmd rename path newpath channel
The rename subcommand receives the path of the current file, the new file
path, and a channel to write to as its three arguments. The rename
subcommand renames the current file to the new file path if the path to the
new file exists, and then prints out the appropriate message to the channel.
If the new file path doesn't exist the appropriate error message is printed
to the channel. The rename subcommand returns nothing.

fsCmd retr path
The retr subcommand receives the path of a file to read as its only
argument. The retr subcommand returns a readable channel that the specified
file can be read from.

fsCmd rmdir path channel
The rmdir subcommand receives the path of a directory to remove and a
channel to write to as its two arguments. The rmdir subcommand removes the
specified directory (if possible) and prints the appropriate message to the
channel (which may be an error if the specified directory does not exist or
is not empty). The rmdir subcommand returns nothing.

fsCmd size path channel
The size subcommand receives the path of a file to get the size (in bytes)
of and a channel to write to as its two arguments. The size subcommand
prints the appropriate code and the size of the file if the specified path
is a file, otherwise an appropriate error code and message are printed to
the channel. The size subcommand returns nothing.

fsCmd store path
The store subcommand receives the path of a file to write as its only
argument. The store subcommand returns a writable channel.

closeCmd
The closeCmd receives no arguments when it is invoked, and any return value it may
generate is discarded.

xferDoneCmd sock sock2 file bytes filename err
The xferDoneCmd receives six arguments when invoked. These are, in this order, the
channel handle of the control socket for the connection, the channel handle of the
data socket used for the transfer (already closed), the handle of the channel
containing the transfered file, the number of bytes transfered, the path of the
file which was transfered, and a (possibly empty) error message. Any return value
it may generate is discarded.

VARIABLES

       ::ftpd::cwd
              The current working directory for a session when someone first connects to the FTPD
              or when the REIN ftp command is received.

       ::ftpd::contact
              The  e-mail  address  of  the  person that is the contact for the ftp server.  This
              address is printed out as part of the response to the FTP HELP command.

       ::ftpd::port
              The port that the ftp server should listen on.  If port is specified as  zero,  the
              operating  system  will  allocate  an  unused  port  for  use  as  a server socket;
              afterwards, the variable will contain the port number that was allocated.

       ::ftpd::welcome
              The message that is printed out when the user first connects to the ftp server.

       ::ftpd::CurrentSocket
              Accessible to all callbacks and all filesystem commands (which are a  special  form
              of  callback)  and  contains the handle of the socket channel which was active when
              the callback was invoked.

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.    Please   report  such  in  the  category  ftpd  of  the  Tcllib  SF  Trackers
       [http://sourceforge.net/tracker/?group_id=12883].   Please  also  report  any  ideas   for
       enhancements you may have for either package and/or documentation.

KEYWORDS

       ftp, ftpd, ftpserver, rfc 959, services