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:
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: false.
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.
The server's welcome message.
Public Class Methods
# File lib/net/ftp.rb, line 149
def initialize(host = nil, user = nil, passwd = nil, acct = nil)
super()
@binary = true
@passive = false
@debug_mode = false
@resume = false
@sock = NullSocket.new
@logged_in = false
@open_timeout = nil
@read_timeout = 60
if host
connect(host)
if user
login(user, passwd, acct)
end
end
end Creates and returns a new FTP object. If a host is given, a connection is made. Additionally, if the user is given, the given user name, password, and (optionally) account are used to log in. See login.
# File lib/net/ftp.rb, line 131
def FTP.open(host, user = nil, passwd = nil, acct = nil)
if block_given?
ftp = new(host, user, passwd, acct)
begin
yield ftp
ensure
ftp.close
end
else
new(host, user, passwd, acct)
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 880
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 732 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 169
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 802
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 953
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 969 def closed? @sock == nil or @sock.closed? end
Returns true iff the connection is closed.
# File lib/net/ftp.rb, line 243
def connect(host, port = FTP_PORT)
if @debug_mode
print "connect: ", host, ", ", port, "\n"
end
synchronize do
@sock = open_socket(host, port)
voidresp
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 788
def delete(filename)
resp = sendcmd("DELE " + filename)
if resp[0, 3] == "250"
return
elsif resp[0] == ?5
raise FTPPermError, resp
else
raise FTPReplyError, resp
end
end Deletes a file on the server.
# File lib/net/ftp.rb, line 661
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 603
def getbinaryfile(remotefile, localfile = File.basename(remotefile),
blocksize = DEFAULT_BLOCKSIZE) # :yield: data
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 = ""
end
begin
f.binmode if localfile
retrbinary("RETR " + remotefile.to_s, blocksize, rest_offset) do |data|
f.write(data) if localfile
yield(data) if block_given?
result.concat(data) if result
end
return result
ensure
f.close if localfile
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 637
def gettextfile(remotefile, localfile = File.basename(remotefile)) # :yield: line
result = nil
if localfile
f = File.open(localfile, "w")
elsif !block_given?
result = ""
end
begin
retrlines("RETR " + remotefile) do |line, newline|
l = newline ? line + "\n" : line
f.print(l) if localfile
yield(line, newline) if block_given?
result.concat(l) if result
end
return result
ensure
f.close if localfile
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 917
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 756
def list(*args, &block) # :yield: line
cmd = "LIST"
args.each do |arg|
cmd = cmd + " " + arg.to_s
end
if block
retrlines(cmd, &block)
else
lines = []
retrlines(cmd) do |line|
lines << line
end
return lines
end
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 454
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[0] == ?3
raise FTPReplyError, resp if passwd.nil?
resp = sendcmd('PASS ' + passwd)
end
if resp[0] == ?3
raise FTPReplyError, resp if acct.nil?
resp = sendcmd('ACCT ' + acct)
end
end
if resp[0] != ?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 907
def mdtm(filename)
resp = sendcmd("MDTM " + filename)
if resp[0, 3] == "213"
return resp[3 .. -1].strip
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 845
def mkdir(dirname)
resp = sendcmd("MKD " + dirname)
return parse257(resp)
end Creates a remote directory.
# File lib/net/ftp.rb, line 836
def mtime(filename, local = false)
str = mdtm(filename)
ary = str.scan(MDTM_REGEXP)[0].collect {|i| i.to_i}
return local ? Time.local(*ary) : Time.gm(*ary)
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 740
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 937
def noop
voidcmd("NOOP")
end Issues a NOOP command.
Does nothing except return a response.
# File lib/net/ftp.rb, line 717
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 675
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 704
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 860
def pwd
resp = sendcmd("PWD")
return parse257(resp)
end Returns the current remote directory.
# File lib/net/ftp.rb, line 928
def quit
voidcmd("QUIT")
end Exits the FTP session.
# File lib/net/ftp.rb, line 110 def read_timeout=(sec) @sock.read_timeout = sec @read_timeout = sec end
Setter for the #read_timeout attribute.
# File lib/net/ftp.rb, line 777
def rename(fromname, toname)
resp = sendcmd("RNFR " + fromname)
if resp[0] != ?3
raise FTPReplyError, resp
end
voidcmd("RNTO " + toname)
end Renames a file on the server.
# File lib/net/ftp.rb, line 485
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 512
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 853
def rmdir(dirname)
voidcmd("RMD " + dirname)
end Removes a remote directory.
# File lib/net/ftp.rb, line 352
def sendcmd(cmd)
synchronize do
putline(cmd)
return getresp
end
end Sends a command and returns the response.
# File lib/net/ftp.rb, line 944 def site(arg) cmd = "SITE " + arg voidcmd(cmd) end
Issues a SITE command.
# File lib/net/ftp.rb, line 820
def size(filename)
with_binary(true) do
resp = sendcmd("SIZE " + filename)
if resp[0, 3] != "213"
raise FTPReplyError, resp
end
return resp[3..-1].strip.to_i
end
end Returns the size of the given (remote) filename.
# File lib/net/ftp.rb, line 894 def status line = "STAT" + CRLF print "put: STAT\n" if @debug_mode @sock.send(line, Socket::MSG_OOB) return getresp end
Returns the status (STAT command).
# File lib/net/ftp.rb, line 539
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 571
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 869
def system
resp = sendcmd("SYST")
if resp[0, 3] != "215"
raise FTPReplyError, resp
end
return resp[4 .. -1]
end Returns system information.
# File lib/net/ftp.rb, line 362
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 1007
def parse_pasv_ipv4_host(s)
return s.tr(",", ".")
end # File lib/net/ftp.rb, line 1012
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 1019
def parse_pasv_port(s)
return s.split(/,/).map(&:to_i).inject { |x, y|
(x << 8) + y
}
end
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Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.