Class: Net::FTP

Inherits:
Protocol
  • Object
show all
Includes:
MonitorMixin, OpenSSL, SSL
Defined in:
lib/net/ftp.rb

Overview

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.
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.
  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:

  • FTP.open

  • #getbinaryfile

  • #gettextfile

  • #putbinaryfile

  • #puttextfile

  • #chdir

  • #nlst

  • #size

  • #rename

  • #delete

Mainframe User Support

  • #literal

  • #quote

Defined Under Namespace

Classes: BufferedSSLSocket, BufferedSocket, MLSxEntry, NullSocket

Constant Summary collapse

VERSION =

:stopdoc:

"0.3.8"
FTP_PORT = 
21
CRLF = 
"\r\n"
DEFAULT_BLOCKSIZE = 
BufferedIO::BUFSIZE
CASE_DEPENDENT_PARSER = 
->(value) { value }
CASE_INDEPENDENT_PARSER = 
->(value) { value.downcase }
DECIMAL_PARSER = 
->(value) { value.to_i }
OCTAL_PARSER = 
->(value) { value.to_i(8) }
TIME_PARSER = 
->(value, local = false) {
  unless /\A(?<year>\d{4})(?<month>\d{2})(?<day>\d{2})
        (?<hour>\d{2})(?<min>\d{2})(?<sec>\d{2})
        (?:\.(?<fractions>\d{1,17}))?/x =~ value
    value = value[0, 97] + "..." if value.size > 100
    raise FTPProtoError, "invalid time-val: #{value}"
  end
  usec = ".#{fractions}".to_r * 1_000_000 if fractions
  Time.public_send(local ? :local : :utc, year, month, day, hour, min, sec, usec)
}
FACT_PARSERS = 
Hash.new(CASE_DEPENDENT_PARSER)
@@default_passive = 
true

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host = nil, user_or_options = {}, passwd = nil, acct = nil) ⇒ FTP

:call-seq:

Net::FTP.new(host = nil, options = {})

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[:ssl] 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[:ssl] 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: true when options[:ssl] is true.

implicit_ftps

If true, TLS is established on initial connection. Default: false

username

Username for login. If options[:username] is the string “anonymous” and the options[:password] 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 Net::FTP#open_timeout for details. Default: nil.

read_timeout

Number of seconds to wait for one block to be read. See Net::FTP#read_timeout for details. Default: 60.

ssl_handshake_timeout

Number of seconds to wait for the TLS handshake. See Net::FTP#ssl_handshake_timeout for details. Default: nil.

use_pasv_ip

When true, use the IP address in PASV responses. Otherwise, it uses the same IP address for the control connection. Default: false.

debug_mode

When true, all traffic to and from the server is written to $stdout. Default: false.



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# File 'lib/net/ftp.rb', line 230

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

    # jruby-openssl does not support session caching
    unless RUBY_ENGINE == "jruby"
      @ssl_context.session_cache_mode =
        OpenSSL::SSL::SSLContext::SESSION_CACHE_CLIENT |
        OpenSSL::SSL::SSLContext::SESSION_CACHE_NO_INTERNAL_STORE
      @ssl_context.session_new_cb = proc {|sock, sess| @ssl_session = sess }
    end

    @ssl_session = nil
    if options[:private_data_connection].nil?
      @private_data_connection = true
    else
      @private_data_connection = options[:private_data_connection]
    end
    if options[:implicit_ftps].nil?
      @implicit_ftps = false
    else
      @implicit_ftps = options[:implicit_ftps]
    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
    if options[:implicit_ftps]
      raise ArgumentError,
            "implicit_ftps can be set to true only when ssl is enabled"
    end
    @implicit_ftps = 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
  @debug_output = $stdout
  @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
  @use_pasv_ip = options[:use_pasv_ip] || false
  if host
    connect(host, options[:port] || FTP_PORT)
    if options[:username]
      (options[:username], options[:password], options[:account])
    end
  end
end

Instance Attribute Details

#binary ⇒ Object

When true, transfers are performed in binary mode. Default: true.



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# File 'lib/net/ftp.rb', line 100

def binary
  @binary
end

#debug_mode ⇒ Object

When true, all traffic to and from the server is written to $stdout. Default: false.



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# File 'lib/net/ftp.rb', line 111

def debug_mode
  @debug_mode
end

#debug_output ⇒ Object

Sets or retrieves the output stream for debugging. Output stream will be used only when debug_mode is set to true. The default value is $stdout.



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# File 'lib/net/ftp.rb', line 116

def debug_output
  @debug_output
end

#last_response ⇒ Object (readonly)

The server’s last response.



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# File 'lib/net/ftp.rb', line 155

def last_response
  @last_response
end

#last_response_code ⇒ Object (readonly) Also known as: lastresp

The server’s last response code.



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# File 'lib/net/ftp.rb', line 151

def last_response_code
  @last_response_code
end

#open_timeout ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 126

def open_timeout
  @open_timeout
end

#passive ⇒ Object

When true, the connection is in passive mode. Default: true.



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# File 'lib/net/ftp.rb', line 103

def passive
  @passive
end

#read_timeout ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 139

def read_timeout
  @read_timeout
end

#resume ⇒ Object

Sets or retrieves the resume status, which decides whether incomplete transfers are resumed or restarted. Default: false.



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# File 'lib/net/ftp.rb', line 120

def resume
  @resume
end

#ssl_handshake_timeout ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 133

def ssl_handshake_timeout
  @ssl_handshake_timeout
end

#use_pasv_ip ⇒ Object

When true, use the IP address in PASV responses. Otherwise, it uses the same IP address for the control connection. Default: false.



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# File 'lib/net/ftp.rb', line 107

def use_pasv_ip
  @use_pasv_ip
end

#welcome ⇒ Object (readonly)

The server’s welcome message.



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# File 'lib/net/ftp.rb', line 148

def welcome
  @welcome
end

Class Method Details

.default_passive ⇒ Object

When true, connections are in passive mode per default. Default: true.



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# File 'lib/net/ftp.rb', line 165

def self.default_passive
  @@default_passive
end

.default_passive=(value) ⇒ Object

When true, connections are in passive mode per default. Default: true.



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# File 'lib/net/ftp.rb', line 159

def self.default_passive=(value)
  @@default_passive = value
end

.open(host, *args) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 175

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

Instance Method Details

#abort ⇒ Object

Aborts the previous command (ABOR command).



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# File 'lib/net/ftp.rb', line 1283

def abort
  line = "ABOR" + CRLF
  debug_print "put: ABOR"
  @sock.send(line, Socket::MSG_OOB)
  resp = getmultiline
  unless ["426", "226", "225"].include?(resp[0, 3])
    raise FTPProtoError, resp
  end
  return resp
end

#acct(account) ⇒ Object

Sends the ACCT command.

This is a less common FTP command, to send account information if the destination host requires it.



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# File 'lib/net/ftp.rb', line 925

def acct()
  cmd = "ACCT " + 
  voidcmd(cmd)
end

#chdir(dirname) ⇒ Object

Changes the (remote) directory.



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# File 'lib/net/ftp.rb', line 1194

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

#close ⇒ Object

Closes the connection. Further operations are impossible until you open a new connection with #connect.



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# File 'lib/net/ftp.rb', line 1397

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

#closed? ⇒ Boolean

Returns true if and only if the connection is closed.

Returns:

  • (Boolean) 


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# File 'lib/net/ftp.rb', line 1413

def closed?
  @sock == nil or @sock.closed?
end

#connect(host, port = FTP_PORT) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 402

def connect(host, port = FTP_PORT)
  debug_print "connect: #{host}:#{port}"
  synchronize do
    @host = host
    @bare_sock = open_socket(host, port)
    if @ssl_context
      begin
        unless @implicit_ftps
          set_socket(BufferedSocket.new(@bare_sock, read_timeout: @read_timeout))
          voidcmd("AUTH TLS")
        end
        set_socket(BufferedSSLSocket.new(start_tls_session(@bare_sock), read_timeout: @read_timeout), @implicit_ftps)
        if @private_data_connection
          voidcmd("PBSZ 0")
          voidcmd("PROT P")
        end
      rescue OpenSSL::SSL::SSLError, OpenTimeout
        @sock.close
        raise
      end
    else
      set_socket(BufferedSocket.new(@bare_sock, read_timeout: @read_timeout))
    end
  end
end

#debug_print(msg) ⇒ Object

Writes debug message to the debug output stream



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# File 'lib/net/ftp.rb', line 1488

def debug_print(msg)
  @debug_output << msg + "\n" if @debug_mode && @debug_output
end

#delete(filename) ⇒ Object

Deletes a file on the server.



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# File 'lib/net/ftp.rb', line 1180

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

#features ⇒ Object

Issues a FEAT command

Returns an array of supported optional features



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# File 'lib/net/ftp.rb', line 1363

def features
  resp = sendcmd("FEAT")
  if !resp.start_with?("211")
    raise FTPReplyError, resp
  end

  feats = []
  resp.each_line do |line|
    next if !line.start_with?(' ') # skip status lines

    feats << line.strip
  end

  return feats
end

#get(remotefile, localfile = File.basename(remotefile), blocksize = DEFAULT_BLOCKSIZE, &block) ⇒ Object

Retrieves remotefile in whatever mode the session is set (text or binary). See #gettextfile and #getbinaryfile.



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# File 'lib/net/ftp.rb', line 849

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

#getbinaryfile(remotefile, localfile = File.basename(remotefile), blocksize = DEFAULT_BLOCKSIZE, &block) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 788

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

#gettextfile(remotefile, localfile = File.basename(remotefile), &block) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 823

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

#help(arg = nil) ⇒ Object

Issues the HELP command.



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# File 'lib/net/ftp.rb', line 1326

def help(arg = nil)
  cmd = "HELP"
  if arg
    cmd = cmd + " " + arg
  end
  sendcmd(cmd)
end

#list(*args, &block) ⇒ Object Also known as: ls, dir

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.



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# File 'lib/net/ftp.rb', line 949

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

#login(user = "anonymous", passwd = nil, acct = nil) ⇒ Object

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).



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# File 'lib/net/ftp.rb', line 635

def (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

#mdtm(filename) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 1316

def mdtm(filename)
  resp = sendcmd("MDTM #{filename}")
  if resp.start_with?("213")
    return get_body(resp)
  end
end

#mkdir(dirname) ⇒ Object

Creates a remote directory.



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# File 'lib/net/ftp.rb', line 1238

def mkdir(dirname)
  resp = sendcmd("MKD #{dirname}")
  return parse257(resp)
end

#mlsd(pathname = nil, &block) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 1154

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

#mlst(pathname = nil) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 1132

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

#mtime(filename, local = false) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 1231

def mtime(filename, local = false)
  return TIME_PARSER.(mdtm(filename), local)
end

#nlst(dir = nil) ⇒ Object

Returns an array of filenames in the remote directory.



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# File 'lib/net/ftp.rb', line 933

def nlst(dir = nil)
  cmd = "NLST"
  if dir
    cmd = "#{cmd} #{dir}"
  end
  files = []
  retrlines(cmd) do |line|
    files.push(line)
  end
  return files
end

#noop ⇒ Object

Issues a NOOP command.

Does nothing except return a response.



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# File 'lib/net/ftp.rb', line 1346

def noop
  voidcmd("NOOP")
end

#option(name, params = nil) ⇒ Object

Issues an OPTS command

  • name Should be the name of the option to set

  • params is any optional parameters to supply with the option

example: option(‘UTF8’, ‘ON’) => ‘OPTS UTF8 ON’



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# File 'lib/net/ftp.rb', line 1386

def option(name, params = nil)
  cmd = "OPTS #{name}"
  cmd += " #{params}" if params

  voidcmd(cmd)
end

#put(localfile, remotefile = File.basename(localfile), blocksize = DEFAULT_BLOCKSIZE, &block) ⇒ Object

Transfers localfile to the server in whatever mode the session is set (text or binary). See #puttextfile and #putbinaryfile.



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# File 'lib/net/ftp.rb', line 910

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

#putbinaryfile(localfile, remotefile = File.basename(localfile), blocksize = DEFAULT_BLOCKSIZE, &block) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 863

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

#puttextfile(localfile, remotefile = File.basename(localfile), &block) ⇒ Object

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.

Returns the response which will contain a job number if the user was communicating with a mainframe in ASCII mode after issuing ‘quote site filetype=jes’



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# File 'lib/net/ftp.rb', line 895

def puttextfile(localfile, remotefile = File.basename(localfile), &block) # :yield: line
  f = File.open(localfile)
  response = ''
  begin
    response = storlines("STOR #{remotefile}", f, &block)
  ensure
    f.close
  end
  response
end

#pwd ⇒ Object Also known as: getdir

Returns the current remote directory.



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# File 'lib/net/ftp.rb', line 1263

def pwd
  resp = sendcmd("PWD")
  return parse257(resp)
end

#quit ⇒ Object

Exits the FTP session.



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# File 'lib/net/ftp.rb', line 1337

def quit
  voidcmd("QUIT")
end

#quote(arguments) ⇒ Object Also known as: literal

The “quote” subcommand sends arguments verbatim to the remote ftp server. The “literal” subcommand is an alias for “quote”.

Parameters:

  • arguments —

    Array to be sent verbatim to the remote ftp server



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# File 'lib/net/ftp.rb', line 1248

def quote(arguments)
  sendcmd(arguments)
end

#rename(fromname, toname) ⇒ Object

Renames a file on the server.



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# File 'lib/net/ftp.rb', line 1169

def rename(fromname, toname)
  resp = sendcmd("RNFR #{fromname}")
  if !resp.start_with?("3")
    raise FTPReplyError, resp
  end
  voidcmd("RNTO #{toname}")
end

#retrbinary(cmd, blocksize, rest_offset = nil) ⇒ Object

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”).



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# File 'lib/net/ftp.rb', line 666

def retrbinary(cmd, blocksize, rest_offset = nil) # :yield: data
  synchronize do
    with_binary(true) do
      begin
        conn = transfercmd(cmd, rest_offset)
        while data = conn.read(blocksize)
          yield(data)
        end
        conn.shutdown(Socket::SHUT_WR) rescue nil
        conn.read_timeout = 1
        conn.read rescue nil
      ensure
        conn.close if conn
      end
      voidresp
    end
  end
end

#retrlines(cmd) ⇒ Object

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”).



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# File 'lib/net/ftp.rb', line 691

def retrlines(cmd) # :yield: line
  synchronize do
    with_binary(false) do
      begin
        conn = transfercmd(cmd)
        while line = conn.gets
          yield(line.sub(/\r?\n\z/, ""), !line.match(/\n\z/).nil?)
        end
        conn.shutdown(Socket::SHUT_WR) rescue nil
        conn.read_timeout = 1
        conn.read rescue nil
      ensure
        conn.close if conn
      end
      voidresp
    end
  end
end

#return_code ⇒ Object

Obsolete



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# File 'lib/net/ftp.rb', line 352

def return_code # :nodoc:
  warn("Net::FTP#return_code is obsolete and do nothing", uplevel: 1)
  return "\n"
end

#return_code=(s) ⇒ Object

Obsolete



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# File 'lib/net/ftp.rb', line 358

def return_code=(s) # :nodoc:
  warn("Net::FTP#return_code= is obsolete and do nothing", uplevel: 1)
end

#rmdir(dirname) ⇒ Object

Removes a remote directory.



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# File 'lib/net/ftp.rb', line 1256

def rmdir(dirname)
  voidcmd("RMD #{dirname}")
end

#sendcmd(cmd) ⇒ Object

Sends a command and returns the response.



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# File 'lib/net/ftp.rb', line 523

def sendcmd(cmd)
  synchronize do
    putline(cmd)
    return getresp
  end
end

#set_socket(sock, get_greeting = true) ⇒ Object

Set the socket used to connect to the FTP server.

May raise FTPReplyError if get_greeting is false.



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# File 'lib/net/ftp.rb', line 432

def set_socket(sock, get_greeting = true)
  synchronize do
    @sock = sock
    if get_greeting
      voidresp
    end
  end
end

#site(arg) ⇒ Object

Issues a SITE command.



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# File 'lib/net/ftp.rb', line 1353

def site(arg)
  cmd = "SITE " + arg
  voidcmd(cmd)
end

#size(filename) ⇒ Object

Returns the size of the given (remote) filename.



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# File 'lib/net/ftp.rb', line 1217

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

#status(pathname = nil) ⇒ Object

Returns the status (STAT command).

pathname

when stat is invoked with pathname as a parameter it acts like list but a lot faster and over the same tcp session.



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# File 'lib/net/ftp.rb', line 1300

def status(pathname = nil)
  line = pathname ? "STAT #{pathname}" : "STAT"
  if /[\r\n]/ =~ line
    raise ArgumentError, "A line must not contain CR or LF"
  end
  debug_print "put: #{line}"
  @sock.send(line + CRLF, Socket::MSG_OOB)
  return getresp
end

#storbinary(cmd, file, blocksize, rest_offset = nil) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 716

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
      begin
        conn = transfercmd(cmd)
        while buf = file.read(blocksize)
          conn.write(buf)
          yield(buf) if block_given?
        end
        conn.shutdown(Socket::SHUT_WR) rescue nil
        conn.read_timeout = 1
        conn.read rescue nil
      ensure
        conn.close if conn
      end
      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

#storlines(cmd, file) ⇒ Object

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.



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# File 'lib/net/ftp.rb', line 752

def storlines(cmd, file) # :yield: line
  synchronize do
    with_binary(false) do
      begin
        conn = transfercmd(cmd)
        while buf = file.gets
          if buf[-2, 2] != CRLF
            buf = buf.chomp + CRLF
          end
          conn.write(buf)
          yield(buf) if block_given?
        end
        conn.shutdown(Socket::SHUT_WR) rescue nil
        conn.read_timeout = 1
        conn.read rescue nil
      ensure
        conn.close if conn
      end
      getresp # The response might be important when connected to a mainframe
    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

#system ⇒ Object

Returns system information.



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# File 'lib/net/ftp.rb', line 1272

def system
  resp = sendcmd("SYST")
  if !resp.start_with?("215")
    raise FTPReplyError, resp
  end
  return get_body(resp)
end

#voidcmd(cmd) ⇒ Object

Sends a command and expect a response beginning with ‘2’.



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# File 'lib/net/ftp.rb', line 533

def voidcmd(cmd)
  synchronize do
    putline(cmd)
    voidresp
  end
end