Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
Net::FTP(3)	       Perl Programmers	Reference Guide		   Net::FTP(3)

NAME
       Net::FTP	- FTP Client class

SYNOPSIS
	   use Net::FTP;

	   $ftp	= Net::FTP->new("some.host.name", Debug	=> 0)
	     or	die "Cannot connect to some.host.name: $@";

	   $ftp->login("anonymous",'-anonymous@')
	     or	die "Cannot login ", $ftp->message;

	   $ftp->cwd("/pub")
	     or	die "Cannot change working directory ",	$ftp->message;

	   $ftp->get("that.file")
	     or	die "get failed	", $ftp->message;

	   $ftp->quit;

DESCRIPTION
       "Net::FTP" is a class implementing a simple FTP client in Perl as
       described in RFC959.  It	provides wrappers for the commonly used	subset
       of the RFC959 commands.	If IO::Socket::IP or IO::Socket::INET6 is
       installed it also provides support for IPv6 as defined in RFC2428.  And
       with IO::Socket::SSL installed it provides support for implicit FTPS
       and explicit FTPS as defined in RFC4217.

       The Net::FTP class is a subclass	of Net::Cmd and	(depending on
       avaibility) of IO::Socket::IP, IO::Socket::INET6	or IO::Socket::INET.

OVERVIEW
       FTP stands for File Transfer Protocol.  It is a way of transferring
       files between networked machines.  The protocol defines a client	(whose
       commands	are provided by	this module) and a server (not implemented in
       this module).  Communication is always initiated	by the client, and the
       server responds with a message and a status code	(and sometimes with
       data).

       The FTP protocol	allows files to	be sent	to or fetched from the server.
       Each transfer involves a	local file (on the client) and a remote	file
       (on the server).	 In this module, the same file name will be used for
       both local and remote if	only one is specified.	This means that
       transferring remote file	"/path/to/file"	will try to put	that file in
       "/path/to/file" locally,	unless you specify a local file	name.

       The protocol also defines several standard translations which the file
       can undergo during transfer.  These are ASCII, EBCDIC, binary, and
       byte.  ASCII is the default type, and indicates that the	sender of
       files will translate the	ends of	lines to a standard representation
       which the receiver will then translate back into	their local
       representation.	EBCDIC indicates the file being	transferred is in
       EBCDIC format.  Binary (also known as image) format sends the data as a
       contiguous bit stream.  Byte format transfers the data as bytes,	the
       values of which remain the same regardless of differences in byte size
       between the two machines	(in theory - in	practice you should only use
       this if you really know what you're doing).  This class does not
       support the EBCDIC or byte formats, and will default to binary instead
       if they are attempted.

CONSTRUCTOR
       new ([ HOST ] [,	OPTIONS	])
	   This	is the constructor for a new Net::FTP object. "HOST" is	the
	   name	of the remote host to which an FTP connection is required.

	   "HOST" is optional. If "HOST" is not	given then it may instead be
	   passed as the "Host"	option described below.

	   "OPTIONS" are passed	in a hash like fashion,	using key and value
	   pairs.  Possible options are:

	   Host	- FTP host to connect to. It may be a single scalar, as
	   defined for the "PeerAddr" option in	IO::Socket::INET, or a
	   reference to	an array with hosts to try in turn. The	"host" method
	   will	return the value which was used	to connect to the host.

	   Firewall - The name of a machine which acts as an FTP firewall.
	   This	can be overridden by an	environment variable "FTP_FIREWALL".
	   If specified, and the given host cannot be directly connected to,
	   then	the connection is made to the firewall machine and the string
	   @hostname is	appended to the	login identifier. This kind of setup
	   is also referred to as an ftp proxy.

	   FirewallType	- The type of firewall running on the machine
	   indicated by	Firewall. This can be overridden by an environment
	   variable "FTP_FIREWALL_TYPE". For a list of permissible types, see
	   the description of ftp_firewall_type	in Net::Config.

	   BlockSize - This is the block size that Net::FTP will use when
	   doing transfers. (defaults to 10240)

	   Port	- The port number to connect to	on the remote machine for the
	   FTP connection

	   SSL - If the	connection should be done from start with SSL,
	   contrary to later upgrade with "starttls".

	   SSL_* - SSL arguments which will be applied when upgrading the
	   control or data connection to SSL. You can use SSL arguments	as
	   documented in IO::Socket::SSL, but it will usually use the right
	   arguments already.

	   Timeout - Set a timeout value in seconds (defaults to 120)

	   Debug - debug level (see the	debug method in	Net::Cmd)

	   Passive - If	set to a non-zero value	then all data transfers	will
	   be done using passive mode. If set to zero then data	transfers will
	   be done using active	mode.  If the machine is connected to the
	   Internet directly, both passive and active mode should work equally
	   well.  Behind most firewall and NAT configurations passive mode has
	   a better chance of working.	However, in some rare firewall
	   configurations, active mode actually	works when passive mode
	   doesn't.  Some really old FTP servers might not implement passive
	   transfers.  If not specified, then the transfer mode	is set by the
	   environment variable	"FTP_PASSIVE" or if that one is	not set	by the
	   settings done by the	libnetcfg utility.  If none of these apply
	   then	passive	mode is	used.

	   Hash	- If given a reference to a file handle	(e.g., "\*STDERR"),
	   print hash marks (#)	on that	filehandle every 1024 bytes.  This
	   simply invokes the "hash()" method for you, so that hash marks are
	   displayed for all transfers.	 You can, of course, call "hash()"
	   explicitly whenever you'd like.

	   LocalAddr - Local address to	use for	all socket connections.	This
	   argument will be passed to the super	class, i.e. IO::Socket::INET
	   or IO::Socket::IP.

	   Domain - Domain to use, i.e.	AF_INET	or AF_INET6. This argument
	   will	be passed to the IO::Socket super class.  This can be used to
	   enforce IPv4	even with IO::Socket::IP which would default to	IPv6.
	   Family is accepted as alternative name for Domain.

	   If the constructor fails undef will be returned and an error
	   message will	be in $@

METHODS
       Unless otherwise	stated all methods return either a true	or false
       value, with true	meaning	that the operation was a success. When a
       method states that it returns a value, failure will be returned as
       undef or	an empty list.

       "Net::FTP" inherits from	"Net::Cmd" so methods defined in "Net::Cmd"
       may be used to send commands to the remote FTP server in	addition to
       the methods documented here.

       login ([LOGIN [,PASSWORD	[, ACCOUNT] ] ])
	   Log into the	remote FTP server with the given login information. If
	   no arguments	are given then the "Net::FTP" uses the "Net::Netrc"
	   package to lookup the login information for the connected host.  If
	   no information is found then	a login	of anonymous is	used.  If no
	   password is given and the login is anonymous	then anonymous@	will
	   be used for password.

	   If the connection is	via a firewall then the	"authorize" method
	   will	be called with no arguments.

       starttls	()
	   Upgrade existing plain connection to	SSL.  The SSL arguments	have
	   to be given in "new"	already	because	they are needed	for data
	   connections too.

       stoptls ()
	   Downgrade existing SSL connection back to plain.  This is needed to
	   work	with some FTP helpers at firewalls, which need to see the PORT
	   and PASV commands and responses to dynamically open the necessary
	   ports.  In this case	"starttls" is usually only done	to protect the
	   authorization.

       prot ( LEVEL )
	   Set what type of data channel protection the	client and server will
	   be using.  Only "LEVEL"s "C"	(clear)	and "P"	(private) are
	   supported.

       host ()
	   Returns the value used by the constructor, and passed to the
	   IO::Socket super class to connect to	the host.

       account(	ACCT )
	   Set a string	identifying the	user's account.

       authorize ( [AUTH [, RESP]])
	   This	is a protocol used by some firewall ftp	proxies. It is used to
	   authorise the user to send data out.	 If both arguments are not
	   specified then "authorize" uses "Net::Netrc"	to do a	lookup.

       site (ARGS)
	   Send	a SITE command to the remote server and	wait for a response.

	   Returns most	significant digit of the response code.

       ascii ()
	   Transfer file in ASCII. CRLF	translation will be done if required

       binary ()
	   Transfer file in binary mode. No transformation will	be done.

	   Hint: If both server	and client machines use	the same line ending
	   for text files, then	it will	be faster to transfer all files	in
	   binary mode.

       type ( [	TYPE ] )
	   Set or get if files will be transferred in ASCII or binary mode.

       rename (	OLDNAME, NEWNAME )
	   Rename a file on the	remote FTP server from "OLDNAME" to "NEWNAME".
	   This	is done	by sending the RNFR and	RNTO commands.

       delete (	FILENAME )
	   Send	a request to the server	to delete "FILENAME".

       cwd ( [ DIR ] )
	   Attempt to change directory to the directory	given in $dir.	If
	   $dir	is "..", the FTP "CDUP"	command	is used	to attempt to move up
	   one directory. If no	directory is given then	an attempt is made to
	   change the directory	to the root directory.

       cdup ()
	   Change directory to the parent of the current directory.

       passive ( [ PASSIVE ] )
	   Set or get if data connections will be initiated in passive mode.

       pwd ()
	   Returns the full pathname of	the current directory.

       restart ( WHERE )
	   Set the byte	offset at which	to begin the next data transfer.
	   Net::FTP simply records this	value and uses it when during the next
	   data	transfer. For this reason this method will not return an
	   error, but setting it may cause a subsequent	data transfer to fail.

       rmdir ( DIR [, RECURSE ])
	   Remove the directory	with the name "DIR". If	"RECURSE" is true then
	   "rmdir" will	attempt	to delete everything inside the	directory.

       mkdir ( DIR [, RECURSE ])
	   Create a new	directory with the name	"DIR". If "RECURSE" is true
	   then	"mkdir"	will attempt to	create all the directories in the
	   given path.

	   Returns the full pathname to	the new	directory.

       alloc ( SIZE [, RECORD_SIZE] )
	   The alloc command allows you	to give	the ftp	server a hint about
	   the size of the file	about to be transferred	using the ALLO ftp
	   command. Some storage systems use this to make intelligent
	   decisions about how to store	the file.  The "SIZE" argument
	   represents the size of the file in bytes. The "RECORD_SIZE"
	   argument indicates a	maximum	record or page size for	files sent
	   with	a record or page structure.

	   The size of the file	will be	determined, and	sent to	the server
	   automatically for normal files so that this method need only	be
	   called if you are transferring data from a socket, named pipe, or
	   other stream	not associated with a normal file.

       ls ( [ DIR ] )
	   Get a directory listing of "DIR", or	the current directory.

	   In an array context,	returns	a list of lines	returned from the
	   server. In a	scalar context,	returns	a reference to a list.

       dir ( [ DIR ] )
	   Get a directory listing of "DIR", or	the current directory in long
	   format.

	   In an array context,	returns	a list of lines	returned from the
	   server. In a	scalar context,	returns	a reference to a list.

       get ( REMOTE_FILE [, LOCAL_FILE [, WHERE]] )
	   Get "REMOTE_FILE" from the server and store locally.	"LOCAL_FILE"
	   may be a filename or	a filehandle. If not specified,	the file will
	   be stored in	the current directory with the same leafname as	the
	   remote file.

	   If "WHERE" is given then the	first "WHERE" bytes of the file	will
	   not be transferred, and the remaining bytes will be appended	to the
	   local file if it already exists.

	   Returns "LOCAL_FILE", or the	generated local	file name if
	   "LOCAL_FILE"	is not given. If an error was encountered undef	is
	   returned.

       put ( LOCAL_FILE	[, REMOTE_FILE ] )
	   Put a file on the remote server. "LOCAL_FILE" may be	a name or a
	   filehandle.	If "LOCAL_FILE"	is a filehandle	then "REMOTE_FILE"
	   must	be specified. If "REMOTE_FILE" is not specified	then the file
	   will	be stored in the current directory with	the same leafname as
	   "LOCAL_FILE".

	   Returns "REMOTE_FILE", or the generated remote filename if
	   "REMOTE_FILE" is not	given.

	   NOTE: If for	some reason the	transfer does not complete and an
	   error is returned then the contents that had	been transferred will
	   not be remove automatically.

       put_unique ( LOCAL_FILE [, REMOTE_FILE ]	)
	   Same	as put but uses	the "STOU" command.

	   Returns the name of the file	on the server.

       append (	LOCAL_FILE [, REMOTE_FILE ] )
	   Same	as put but appends to the file on the remote server.

	   Returns "REMOTE_FILE", or the generated remote filename if
	   "REMOTE_FILE" is not	given.

       unique_name ()
	   Returns the name of the last	file stored on the server using	the
	   "STOU" command.

       mdtm ( FILE )
	   Returns the modification time of the	given file

       size ( FILE )
	   Returns the size in bytes for the given file	as stored on the
	   remote server.

	   NOTE: The size reported is the size of the stored file on the
	   remote server.  If the file is subsequently transferred from	the
	   server in ASCII mode	and the	remote server and local	machine	have
	   different ideas about "End Of Line" then the	size of	file on	the
	   local machine after transfer	may be different.

       supported ( CMD )
	   Returns TRUE	if the remote server supports the given	command.

       hash ( [FILEHANDLE_GLOB_REF],[ BYTES_PER_HASH_MARK] )
	   Called without parameters, or with the first	argument false,	hash
	   marks are suppressed.  If the first argument	is true	but not	a
	   reference to	a file handle glob, then \*STDERR is used.  The	second
	   argument is the number of bytes per hash mark printed, and defaults
	   to 1024.  In	all cases the return value is a	reference to an	array
	   of two:  the	filehandle glob	reference and the bytes	per hash mark.

       feature ( NAME )
	   Determine if	the server supports the	specified feature. The return
	   value is a list of lines the	server responded with to describe the
	   options that	it supports for	the given feature. If the feature is
	   unsupported then the	empty list is returned.

	     if	($ftp->feature(	'MDTM' )) {
	       # Do something
	     }

	     if	(grep {	/\bTLS\b/ } $ftp->feature('AUTH')) {
	       # Server	supports TLS
	     }

       The following methods can return	different results depending on how
       they are	called.	If the user explicitly calls either of the "pasv" or
       "port" methods then these methods will return a true or false value. If
       the user	does not call either of	these methods then the result will be
       a reference to a	"Net::FTP::dataconn" based object.

       nlst ( [	DIR ] )
	   Send	an "NLST" command to the server, with an optional parameter.

       list ( [	DIR ] )
	   Same	as "nlst" but using the	"LIST" command

       retr ( FILE )
	   Begin the retrieval of a file called	"FILE" from the	remote server.

       stor ( FILE )
	   Tell	the server that	you wish to store a file. "FILE" is the	name
	   of the new file that	should be created.

       stou ( FILE )
	   Same	as "stor" but using the	"STOU" command.	The name of the	unique
	   file	which was created on the server	will be	available via the
	   "unique_name" method	after the data connection has been closed.

       appe ( FILE )
	   Tell	the server that	we want	to append some data to the end of a
	   file	called "FILE". If this file does not exist then	create it.

       If for some reason you want to have complete control over the data
       connection, this	includes generating it and calling the "response"
       method when required, then the user can use these methods to do so.

       However calling these methods only affects the use of the methods above
       that can	return a data connection. They have no effect on methods
       "get", "put", "put_unique" and those that do not	require	data
       connections.

       port ( [	PORT ] )
       eprt ( [	PORT ] )
	   Send	a "PORT" (IPv4)	or "EPRT" (IPv6) command to the	server.	If
	   "PORT" is specified then it is sent to the server. If not, then a
	   listen socket is created and	the correct information	sent to	the
	   server.

       pasv ()
       epsv ()
	   Tell	the server to go into passive mode ("pasv" for IPv4, "epsv"
	   for IPv6).  Returns the text	that represents	the port on which the
	   server is listening,	this text is in	a suitable form	to send	to
	   another ftp server using the	"port" or "eprt" method.

       The following methods can be used to transfer files between two remote
       servers,	providing that these two servers can connect directly to each
       other.

       pasv_xfer ( SRC_FILE, DEST_SERVER [, DEST_FILE ]	)
	   This	method will do a file transfer between two remote ftp servers.
	   If "DEST_FILE" is omitted then the leaf name	of "SRC_FILE" will be
	   used.

       pasv_xfer_unique	( SRC_FILE, DEST_SERVER	[, DEST_FILE ] )
	   Like	"pasv_xfer" but	the file is stored on the remote server	using
	   the STOU command.

       pasv_wait ( NON_PASV_SERVER )
	   This	method can be used to wait for a transfer to complete between
	   a passive server and	a non-passive server. The method should	be
	   called on the passive server	with the "Net::FTP" object for the
	   non-passive server passed as	an argument.

       abort ()
	   Abort the current data transfer.

       quit ()
	   Send	the QUIT command to the	remote FTP server and close the	socket
	   connection.

   Methods for the adventurous
       quot (CMD [,ARGS])
	   Send	a command, that	Net::FTP does not directly support, to the
	   remote server and wait for a	response.

	   Returns most	significant digit of the response code.

	   WARNING This	call should only be used on commands that do not
	   require data	connections. Misuse of this method can hang the
	   connection.

       can_inet6 ()
	   Returns whether we can use IPv6.

       can_ssl ()
	   Returns whether we can use SSL.

THE dataconn CLASS
       Some of the methods defined in "Net::FTP" return	an object which	will
       be derived from the "Net::FTP::dataconn"	class. See Net::FTP::dataconn
       for more	details.

UNIMPLEMENTED
       The following RFC959 commands have not been implemented:

       SMNT
	   Mount a different file system structure without changing login or
	   accounting information.

       HELP
	   Ask the server for "helpful information" (that's what the RFC says)
	   on the commands it accepts.

       MODE
	   Specifies transfer mode (stream, block or compressed) for file to
	   be transferred.

       SYST
	   Request remote server system	identification.

       STAT
	   Request remote server status.

       STRU
	   Specifies file structure for	file to	be transferred.

       REIN
	   Reinitialize	the connection,	flushing all I/O and account
	   information.

REPORTING BUGS
       When reporting bugs/problems please include as much information as
       possible.  It may be difficult for me to	reproduce the problem as
       almost every setup is different.

       A small script which yields the problem will probably be	of help. It
       would also be useful if this script was run with	the extra options
       "Debug => 1" passed to the constructor, and the output sent with	the
       bug report. If you cannot include a small script	then please include a
       Debug trace from	a run of your program which does yield the problem.

AUTHOR
       Graham Barr <gbarr@pobox.com>.

       Steve Hay <shay@cpan.org> is now	maintaining libnet as of version
       1.22_02.

SEE ALSO
       Net::Netrc, Net::Cmd, IO::Socket::SSL

       ftp(1), ftpd(8),	RFC 959, RFC 2428, RFC 4217
       http://www.ietf.org/rfc/rfc959.txt http://www.ietf.org/rfc/rfc2428.txt
       http://www.ietf.org/rfc/rfc4217.txt

USE EXAMPLES
       For an example of the use of Net::FTP see

       http://www.csh.rit.edu/~adam/Progs/
	   "autoftp" is	a program that can retrieve, send, or list files via
	   the FTP protocol in a non-interactive manner.

CREDITS
       Henry Gabryjelski <henryg@WPI.EDU> - for	the suggestion of creating
       directories recursively.

       Nathan Torkington <gnat@frii.com> - for some input on the
       documentation.

       Roderick	Schertler <roderick@gate.net> -	for various inputs

COPYRIGHT
       Copyright (C) 1995-2004 Graham Barr.  All rights	reserved.

       Copyright (C) 2013-2017 Steve Hay.  All rights reserved.

LICENCE
       This module is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself, i.e. under the terms of either the
       GNU General Public License or the Artistic License, as specified	in the
       LICENCE file.

perl v5.28.3			  2020-05-14			   Net::FTP(3)

NAME | SYNOPSIS | DESCRIPTION | OVERVIEW | CONSTRUCTOR | METHODS | THE dataconn CLASS | UNIMPLEMENTED | REPORTING BUGS | AUTHOR | SEE ALSO | USE EXAMPLES | CREDITS | COPYRIGHT | LICENCE

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Net::FTP&sektion=3&manpath=FreeBSD+13.0-RELEASE+and+Ports>

home | help