class Net::FTP
This class implements the File Transfer Protocol. If you have used a command-line FTP program, and are familiar with the commands, you will be able to use this class easily. Some extra features are included to take advantage of Ruby's style and strengths.
Example
require 'net/ftp'
Example 1
ftp = Net::FTP.new('example.com')
ftp.login
files = ftp.chdir('pub/lang/ruby/contrib')
files = ftp.list('n*')
ftp.getbinaryfile('nif.rb-0.91.gz', 'nif.gz', 1024)
ftp.close
Example 2
Net::FTP.open('example.com') do |ftp|
ftp.login
files = ftp.chdir('pub/lang/ruby/contrib')
files = ftp.list('n*')
ftp.getbinaryfile('nif.rb-0.91.gz', 'nif.gz', 1024)
end
Major Methods
The following are the methods most likely to be useful to users:
Constants
- CASE_DEPENDENT_PARSER
- CASE_INDEPENDENT_PARSER
- DECIMAL_PARSER
- FACT_PARSERS
- OCTAL_PARSER
- TIME_PARSER
Attributes
When true, transfers are performed in binary mode. Default: true.
When true, all traffic to and from the server is written to +$stdout+. Default: false.
The server's last response.
The server's last response code.
The server's last response code.
Number of seconds to wait for the connection to open. Any number may be used, including Floats for fractional seconds. If the FTP object cannot open a connection in this many seconds, it raises a Net::OpenTimeout exception. The default value is nil.
When true, the connection is in passive mode. Default: true.
Number of seconds to wait for one block to be read (via one read(2) call). Any number may be used, including Floats for fractional seconds. If the FTP object cannot read data in this many seconds, it raises a Timeout::Error exception. The default value is 60 seconds.
Sets or retrieves the resume status, which decides whether incomplete transfers are resumed or restarted. Default: false.
Number of seconds to wait for the TLS handshake. Any number may be used, including Floats for fractional seconds. If the FTP object cannot complete the TLS handshake in this many seconds, it raises a Net::OpenTimeout exception. The default value is nil. If ssl_handshake_timeout is nil, open_timeout is used instead.
The server's welcome message.
Public Class Methods
# File lib/net/ftp.rb, line 150 def self.default_passive @@default_passive end
When true, connections are in passive mode per default. Default: true.
# File lib/net/ftp.rb, line 144 def self.default_passive=(value) @@default_passive = value end
When true, connections are in passive mode per default. Default: true.
# File lib/net/ftp.rb, line 210
def initialize(host = nil, user_or_options = {}, passwd = nil, acct = nil)
super()
begin
options = user_or_options.to_hash
rescue NoMethodError
# for backward compatibility
options = {}
options[:username] = user_or_options
options[:password] = passwd
options[:account] = acct
end
@host = nil
if options[:ssl]
unless defined?(OpenSSL::SSL)
raise "SSL extension not installed"
end
ssl_params = options[:ssl] == true ? {} : options[:ssl]
@ssl_context = SSLContext.new
@ssl_context.set_params(ssl_params)
if defined?(VerifyCallbackProc)
@ssl_context.verify_callback = VerifyCallbackProc
end
@ssl_session = nil
if options[:private_data_connection].nil?
@private_data_connection = true
else
@private_data_connection = options[:private_data_connection]
end
else
@ssl_context = nil
if options[:private_data_connection]
raise ArgumentError,
"private_data_connection can be set to true only when ssl is enabled"
end
@private_data_connection = false
end
@binary = true
if options[:passive].nil?
@passive = @@default_passive
else
@passive = options[:passive]
end
if options[:debug_mode].nil?
@debug_mode = false
else
@debug_mode = options[:debug_mode]
end
@resume = false
@bare_sock = @sock = NullSocket.new
@logged_in = false
@open_timeout = options[:open_timeout]
@ssl_handshake_timeout = options[:ssl_handshake_timeout]
@read_timeout = options[:read_timeout] || 60
if host
connect(host, options[:port] || FTP_PORT)
if options[:username]
login(options[:username], options[:password], options[:account])
end
end
end Creates and returns a new FTP object. If a host is given, a connection is made.
options is an option hash, each key of which is a symbol.
The available options are:
- port
-
Port number (default value is 21)
- ssl
-
If options is true, then an attempt will be made to use SSL (now TLS) to connect to the server. For this to work OpenSSL [OSSL] and the Ruby OpenSSL [RSSL] extensions need to be installed. If options is a hash, it's passed to OpenSSL::SSL::SSLContext#set_params as parameters.
- private_data_connection
-
If true, TLS is used for data connections. Default:
truewhen options is true. - username
-
Username for login. If options is the string “anonymous” and the options is
nil, “anonymous@” is used as a password. - password
-
Password for login.
- account
-
Account information for ACCT.
- passive
-
When
true, the connection is in passive mode. Default:true. - #open_timeout
-
Number of seconds to wait for the connection to open. See #open_timeout for details. Default:
nil. - #read_timeout
-
Number of seconds to wait for one block to be read. See #read_timeout for details. Default:
60. - #ssl_handshake_timeout
-
Number of seconds to wait for the TLS handshake. See #ssl_handshake_timeout for details. Default:
nil. - #debug_mode
-
When
true, all traffic to and from the server is written to +$stdout+. Default:false.
# File lib/net/ftp.rb, line 160
def FTP.open(host, *args)
if block_given?
ftp = new(host, *args)
begin
yield ftp
ensure
ftp.close
end
else
new(host, *args)
end
end A synonym for FTP.new, but with a mandatory host parameter.
If a block is given, it is passed the FTP object, which will be closed when the block finishes, or when an exception is raised.
Public Instance Methods
# File lib/net/ftp.rb, line 1222
def abort
line = "ABOR" + CRLF
print "put: ABOR\n" if @debug_mode
@sock.send(line, Socket::MSG_OOB)
resp = getmultiline
unless ["426", "226", "225"].include?(resp[0, 3])
raise FTPProtoError, resp
end
return resp
end Aborts the previous command (ABOR command).
# File lib/net/ftp.rb, line 875 def acct(account) cmd = "ACCT " + account voidcmd(cmd) end
Sends the ACCT command.
This is a less common FTP command, to send account information if the destination host requires it.
# File lib/net/ftp.rb, line 273
def binary=(newmode)
if newmode != @binary
@binary = newmode
send_type_command if @logged_in
end
end A setter to toggle transfers in binary mode. newmode is either true or false
# File lib/net/ftp.rb, line 1143
def chdir(dirname)
if dirname == ".."
begin
voidcmd("CDUP")
return
rescue FTPPermError => e
if e.message[0, 3] != "500"
raise e
end
end
end
cmd = "CWD #{dirname}"
voidcmd(cmd)
end Changes the (remote) directory.
# File lib/net/ftp.rb, line 1300
def close
if @sock and not @sock.closed?
begin
@sock.shutdown(Socket::SHUT_WR) rescue nil
orig, self.read_timeout = self.read_timeout, 3
@sock.read rescue nil
ensure
@sock.close
self.read_timeout = orig
end
end
end Closes the connection. Further operations are impossible until you open a new connection with connect.
# File lib/net/ftp.rb, line 1316 def closed? @sock == nil or @sock.closed? end
Returns true iff the connection is closed.
# File lib/net/ftp.rb, line 362
def connect(host, port = FTP_PORT)
if @debug_mode
print "connect: ", host, ", ", port, "\n"
end
synchronize do
@host = host
@bare_sock = open_socket(host, port)
@sock = BufferedSocket.new(@bare_sock, read_timeout: @read_timeout)
voidresp
if @ssl_context
begin
voidcmd("AUTH TLS")
ssl_sock = start_tls_session(@bare_sock)
@sock = BufferedSSLSocket.new(ssl_sock, read_timeout: @read_timeout)
if @private_data_connection
voidcmd("PBSZ 0")
voidcmd("PROT P")
end
rescue OpenSSL::SSL::SSLError, OpenTimeout
@sock.close
raise
end
end
end
end Establishes an FTP connection to host, optionally overriding the default port. If the environment variable SOCKS_SERVER is set, sets up the connection through a SOCKS proxy. Raises an exception (typically Errno::ECONNREFUSED) if the connection cannot be established.
# File lib/net/ftp.rb, line 1129
def delete(filename)
resp = sendcmd("DELE #{filename}")
if resp.start_with?("250")
return
elsif resp.start_with?("5")
raise FTPPermError, resp
else
raise FTPReplyError, resp
end
end Deletes a file on the server.
# File lib/net/ftp.rb, line 804
def get(remotefile, localfile = File.basename(remotefile),
blocksize = DEFAULT_BLOCKSIZE, &block) # :yield: data
if @binary
getbinaryfile(remotefile, localfile, blocksize, &block)
else
gettextfile(remotefile, localfile, &block)
end
end Retrieves remotefile in whatever mode the session is set (text or binary). See gettextfile and getbinaryfile.
# File lib/net/ftp.rb, line 743
def getbinaryfile(remotefile, localfile = File.basename(remotefile),
blocksize = DEFAULT_BLOCKSIZE, &block) # :yield: data
f = nil
result = nil
if localfile
if @resume
rest_offset = File.size?(localfile)
f = File.open(localfile, "a")
else
rest_offset = nil
f = File.open(localfile, "w")
end
elsif !block_given?
result = String.new
end
begin
f&.binmode
retrbinary("RETR #{remotefile}", blocksize, rest_offset) do |data|
f&.write(data)
block&.(data)
result&.concat(data)
end
return result
ensure
f&.close
end
end Retrieves remotefile in binary mode, storing the result in localfile. If localfile is nil, returns retrieved data. If a block is supplied, it is passed the retrieved data in blocksize chunks.
# File lib/net/ftp.rb, line 778
def gettextfile(remotefile, localfile = File.basename(remotefile),
&block) # :yield: line
f = nil
result = nil
if localfile
f = File.open(localfile, "w")
elsif !block_given?
result = String.new
end
begin
retrlines("RETR #{remotefile}") do |line, newline|
l = newline ? line + "\n" : line
f&.print(l)
block&.(line, newline)
result&.concat(l)
end
return result
ensure
f&.close
end
end Retrieves remotefile in ASCII (text) mode, storing the result in localfile. If localfile is nil, returns retrieved data. If a block is supplied, it is passed the retrieved data one line at a time.
# File lib/net/ftp.rb, line 1264
def help(arg = nil)
cmd = "HELP"
if arg
cmd = cmd + " " + arg
end
sendcmd(cmd)
end Issues the HELP command.
# File lib/net/ftp.rb, line 899
def list(*args, &block) # :yield: line
cmd = "LIST"
args.each do |arg|
cmd = "#{cmd} #{arg}"
end
lines = []
retrlines(cmd) do |line|
lines << line
end
if block
lines.each(&block)
end
return lines
end Returns an array of file information in the directory (the output is like `ls -l`). If a block is given, it iterates through the listing.
# File lib/net/ftp.rb, line 594
def login(user = "anonymous", passwd = nil, acct = nil)
if user == "anonymous" and passwd == nil
passwd = "anonymous@"
end
resp = ""
synchronize do
resp = sendcmd('USER ' + user)
if resp.start_with?("3")
raise FTPReplyError, resp if passwd.nil?
resp = sendcmd('PASS ' + passwd)
end
if resp.start_with?("3")
raise FTPReplyError, resp if acct.nil?
resp = sendcmd('ACCT ' + acct)
end
end
if !resp.start_with?("2")
raise FTPReplyError, resp
end
@welcome = resp
send_type_command
@logged_in = true
end Logs in to the remote host. The session must have been previously connected. If user is the string “anonymous” and the password is nil, “anonymous@” is used as a password. If the acct parameter is not nil, an FTP ACCT command is sent following the successful login. Raises an exception on error (typically Net::FTPPermError).
# File lib/net/ftp.rb, line 1254
def mdtm(filename)
resp = sendcmd("MDTM #{filename}")
if resp.start_with?("213")
return get_body(resp)
end
end Returns the raw last modification time of the (remote) file in the format “YYYYMMDDhhmmss” (MDTM command).
Use mtime if you want a parsed Time instance.
# File lib/net/ftp.rb, line 1187
def mkdir(dirname)
resp = sendcmd("MKD #{dirname}")
return parse257(resp)
end Creates a remote directory.
# File lib/net/ftp.rb, line 1103
def mlsd(pathname = nil, &block) # :yield: entry
cmd = pathname ? "MLSD #{pathname}" : "MLSD"
entries = []
retrlines(cmd) do |line|
entries << parse_mlsx_entry(line)
end
if block
entries.each(&block)
end
return entries
end Returns an array of the entries of the directory specified by pathname. Each entry has the facts (e.g., size, last modification time, etc.) and the pathname. If a block is given, it iterates through the listing. If pathname is omitted, the current directory is assumed.
# File lib/net/ftp.rb, line 1081
def mlst(pathname = nil)
cmd = pathname ? "MLST #{pathname}" : "MLST"
resp = sendcmd(cmd)
if !resp.start_with?("250")
raise FTPReplyError, resp
end
line = resp.lines[1]
unless line
raise FTPProtoError, resp
end
entry = line.sub(/\A(250-| *)/, "")
return parse_mlsx_entry(entry)
end Returns data (e.g., size, last modification time, entry type, etc.) about the file or directory specified by pathname. If pathname is omitted, the current directory is assumed.
# File lib/net/ftp.rb, line 1180 def mtime(filename, local = false) return TIME_PARSER.(mdtm(filename), local) end
Returns the last modification time of the (remote) file. If local is true, it is returned as a local time, otherwise it's a UTC time.
# File lib/net/ftp.rb, line 883
def nlst(dir = nil)
cmd = "NLST"
if dir
cmd = "#{cmd} #{dir}"
end
files = []
retrlines(cmd) do |line|
files.push(line)
end
return files
end Returns an array of filenames in the remote directory.
# File lib/net/ftp.rb, line 1284
def noop
voidcmd("NOOP")
end Issues a NOOP command.
Does nothing except return a response.
# File lib/net/ftp.rb, line 860
def put(localfile, remotefile = File.basename(localfile),
blocksize = DEFAULT_BLOCKSIZE, &block)
if @binary
putbinaryfile(localfile, remotefile, blocksize, &block)
else
puttextfile(localfile, remotefile, &block)
end
end Transfers localfile to the server in whatever mode the session is set (text or binary). See puttextfile and putbinaryfile.
# File lib/net/ftp.rb, line 818
def putbinaryfile(localfile, remotefile = File.basename(localfile),
blocksize = DEFAULT_BLOCKSIZE, &block) # :yield: data
if @resume
begin
rest_offset = size(remotefile)
rescue Net::FTPPermError
rest_offset = nil
end
else
rest_offset = nil
end
f = File.open(localfile)
begin
f.binmode
if rest_offset
storbinary("APPE #{remotefile}", f, blocksize, rest_offset, &block)
else
storbinary("STOR #{remotefile}", f, blocksize, rest_offset, &block)
end
ensure
f.close
end
end Transfers localfile to the server in binary mode, storing the result in remotefile. If a block is supplied, calls it, passing in the transmitted data in blocksize chunks.
# File lib/net/ftp.rb, line 847
def puttextfile(localfile, remotefile = File.basename(localfile), &block) # :yield: line
f = File.open(localfile)
begin
storlines("STOR #{remotefile}", f, &block)
ensure
f.close
end
end Transfers localfile to the server in ASCII (text) mode, storing the result in remotefile. If callback or an associated block is supplied, calls it, passing in the transmitted data one line at a time.
# File lib/net/ftp.rb, line 1202
def pwd
resp = sendcmd("PWD")
return parse257(resp)
end Returns the current remote directory.
# File lib/net/ftp.rb, line 1275
def quit
voidcmd("QUIT")
end Exits the FTP session.
# File lib/net/ftp.rb, line 127 def read_timeout=(sec) @sock.read_timeout = sec @read_timeout = sec end
Setter for the #read_timeout attribute.
# File lib/net/ftp.rb, line 1118
def rename(fromname, toname)
resp = sendcmd("RNFR #{fromname}")
if !resp.start_with?("3")
raise FTPReplyError, resp
end
voidcmd("RNTO #{toname}")
end Renames a file on the server.
# File lib/net/ftp.rb, line 625
def retrbinary(cmd, blocksize, rest_offset = nil) # :yield: data
synchronize do
with_binary(true) do
begin
conn = transfercmd(cmd, rest_offset)
loop do
data = conn.read(blocksize)
break if data == nil
yield(data)
end
conn.shutdown(Socket::SHUT_WR)
conn.read_timeout = 1
conn.read
ensure
conn.close if conn
end
voidresp
end
end
end Puts the connection into binary (image) mode, issues the given command, and fetches the data returned, passing it to the associated block in chunks of blocksize characters. Note that cmd is a server command (such as “RETR myfile”).
# File lib/net/ftp.rb, line 652
def retrlines(cmd) # :yield: line
synchronize do
with_binary(false) do
begin
conn = transfercmd(cmd)
loop do
line = conn.gets
break if line == nil
yield(line.sub(/\r?\n\z/, ""), !line.match(/\n\z/).nil?)
end
conn.shutdown(Socket::SHUT_WR)
conn.read_timeout = 1
conn.read
ensure
conn.close if conn
end
voidresp
end
end
end Puts the connection into ASCII (text) mode, issues the given command, and passes the resulting data, one line at a time, to the associated block. If no block is given, prints the lines. Note that cmd is a server command (such as “RETR myfile”).
# File lib/net/ftp.rb, line 1195
def rmdir(dirname)
voidcmd("RMD #{dirname}")
end Removes a remote directory.
# File lib/net/ftp.rb, line 487
def sendcmd(cmd)
synchronize do
putline(cmd)
return getresp
end
end Sends a command and returns the response.
# File lib/net/ftp.rb, line 1291 def site(arg) cmd = "SITE " + arg voidcmd(cmd) end
Issues a SITE command.
# File lib/net/ftp.rb, line 1166
def size(filename)
with_binary(true) do
resp = sendcmd("SIZE #{filename}")
if !resp.start_with?("213")
raise FTPReplyError, resp
end
return get_body(resp).to_i
end
end Returns the size of the given (remote) filename.
# File lib/net/ftp.rb, line 1238
def status(pathname = nil)
line = pathname ? "STAT #{pathname}" : "STAT"
if /[\r\n]/ =~ line
raise ArgumentError, "A line must not contain CR or LF"
end
print "put: #{line}\n" if @debug_mode
@sock.send(line + CRLF, Socket::MSG_OOB)
return getresp
end Returns the status (STAT command). pathname - when stat is invoked with pathname as a parameter it acts like
list but alot faster and over the same tcp session.
# File lib/net/ftp.rb, line 679
def storbinary(cmd, file, blocksize, rest_offset = nil) # :yield: data
if rest_offset
file.seek(rest_offset, IO::SEEK_SET)
end
synchronize do
with_binary(true) do
conn = transfercmd(cmd)
loop do
buf = file.read(blocksize)
break if buf == nil
conn.write(buf)
yield(buf) if block_given?
end
conn.close
voidresp
end
end
rescue Errno::EPIPE
# EPIPE, in this case, means that the data connection was unexpectedly
# terminated. Rather than just raising EPIPE to the caller, check the
# response on the control connection. If getresp doesn't raise a more
# appropriate exception, re-raise the original exception.
getresp
raise
end Puts the connection into binary (image) mode, issues the given server-side command (such as “STOR myfile”), and sends the contents of the file named file to the server. If the optional block is given, it also passes it the data, in chunks of blocksize characters.
# File lib/net/ftp.rb, line 711
def storlines(cmd, file) # :yield: line
synchronize do
with_binary(false) do
conn = transfercmd(cmd)
loop do
buf = file.gets
break if buf == nil
if buf[-2, 2] != CRLF
buf = buf.chomp + CRLF
end
conn.write(buf)
yield(buf) if block_given?
end
conn.close
voidresp
end
end
rescue Errno::EPIPE
# EPIPE, in this case, means that the data connection was unexpectedly
# terminated. Rather than just raising EPIPE to the caller, check the
# response on the control connection. If getresp doesn't raise a more
# appropriate exception, re-raise the original exception.
getresp
raise
end Puts the connection into ASCII (text) mode, issues the given server-side command (such as “STOR myfile”), and sends the contents of the file named file to the server, one line at a time. If the optional block is given, it also passes it the lines.
# File lib/net/ftp.rb, line 1211
def system
resp = sendcmd("SYST")
if !resp.start_with?("215")
raise FTPReplyError, resp
end
return get_body(resp)
end Returns system information.
# File lib/net/ftp.rb, line 497
def voidcmd(cmd)
synchronize do
putline(cmd)
voidresp
end
end Sends a command and expect a response beginning with '2'.
Private Instance Methods
# File lib/net/ftp.rb, line 1061
def parse_mlsx_entry(entry)
facts, pathname = entry.chomp.split(/ /, 2)
unless pathname
raise FTPProtoError, entry
end
return MLSxEntry.new(
facts.scan(/(.*?)=(.*?);/).each_with_object({}) {
|(factname, value), h|
name = factname.downcase
h[name] = FACT_PARSERS[name].(value)
},
pathname)
end # File lib/net/ftp.rb, line 1354
def parse_pasv_ipv4_host(s)
return s.tr(",", ".")
end # File lib/net/ftp.rb, line 1359
def parse_pasv_ipv6_host(s)
return s.split(/,/).map { |i|
"%02x" % i.to_i
}.each_slice(2).map(&:join).join(":")
end # File lib/net/ftp.rb, line 1366
def parse_pasv_port(s)
return s.split(/,/).map(&:to_i).inject { |x, y|
(x << 8) + y
}
end # File lib/net/ftp.rb, line 338
def start_tls_session(sock)
ssl_sock = SSLSocket.new(sock, @ssl_context)
ssl_sock.sync_close = true
ssl_sock.hostname = @host if ssl_sock.respond_to? :hostname=
if @ssl_session &&
Process.clock_gettime(Process::CLOCK_REALTIME) < @ssl_session.time.to_f + @ssl_session.timeout
# ProFTPD returns 425 for data connections if session is not reused.
ssl_sock.session = @ssl_session
end
ssl_socket_connect(ssl_sock, @ssl_handshake_timeout || @open_timeout)
if @ssl_context.verify_mode != VERIFY_NONE
ssl_sock.post_connection_check(@host)
end
@ssl_session = ssl_sock.session
return ssl_sock
end
Ruby Core © 1993–2017 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.