FTPS - How to connect with Ruby?


#1

Hello, I’m new to Ruby and have the first problem I can’t solve myself
after a lot of googling - connecting to a FTPS server (FTP AUTH TLS/
SSL).

  • there’s some library called chilkat, but it’s not free (for this
    little script it’s really too expensive to solve it that way)
  • ftpfxp library is targeted on fxp transfers, but it connects ok -
    but it doesn’t seem like a good library for normal ftp-related work
  • the standard ftp library doesn’t look like it has some support for
    firewall/proxy to get there a program like TLSWrap between client and
    server and solve the problem
  • I found some curl library in prealfa state that could possibly help
    me somehow - but it looks like the last solution when everything else
    fails (prealfa, weird installation)

Could you please give me a hint?


#2

On 20 Mrz., 17:42, “Jan Veselý” removed_email_address@domain.invalid wrote:

server and solve the problem

  • I found some curl library in prealfa state that could possibly help
    me somehow - but it looks like the last solution when everything else
    fails (prealfa, weird installation)

Could you please give me a hint?

Try net/sftp Module. With that I made a backup script on window$ using
scp and/or sftp, because rsync is not available on the server, I have
to back up.

net/sftp project: http://raa.ruby-lang.org/project/net-sftp/

Here’s an example, how it’s working:

arr = Array.new
Net::SFTP.start(@host, @user, @pass) do |sftp|
handle = sftp.opendir(dir)
items = sftp.readdir(handle)
items.each do |item|
arr.push(item)
end
sftp.close_handle(handle)
end
return arr

For more infos you should check the project’s page.

Greetings

Chris


#3

On Mar 20, 10:40 am, “ChrisKaelin” removed_email_address@domain.invalid wrote:

  • ftpfxp library is targeted on fxp transfers, but it connects ok -
    Try net/sftp Module. With that I made a backup script on window$ using
    scp and/or sftp, because rsync is not available on the server, I have
    to back up.

net/sftp project:http://raa.ruby-lang.org/project/net-sftp/

Unfortunately, sftp is a different protocol than FTPS and that module
probably won’t help.

(3 months ago I received a spec saying my company would communicate
with another company using SFTP, only to figure out after code had
been written that they meant FTPS.)

I looked in my install of ruby and found a file net/ftptls.rb. That
code looks like it’s only for Implicit FTPS, not explicit. I’d try it
anyway.

The code I ended up writing (in Java) was a class that interfaced to
the curl command line client. It worked very well. As dirty as it
seemed at the time, I still think it was better than writing JNI to
the curl C interface.

Here is a quick and dirty class to interface to the curl command line
client from ruby. This should work for FTPS, if your curl client was
compiled with it. curl -V will list the protocols it supports.

class CurlFtp

CURL = “curl”

def initialize(url, user, pass, verbose=false)
@url = url
@user = user
@pass = pass
@verboseFlag = (verbose) ? ‘-v’ : ‘’
end

def put(path, &block)
command = sprintf “’%s’ %s --upload-file - --user ‘%s:%s’ ‘%s/
%s’”,
CURL, @verboseFlag, @user, @pass, @url, path
IO.popen(command, “w”, &block)
raise “Curl error: #{$?.to_i / 256}” if $? != 0
end

def get(path, &block)
command = sprintf “’%s’ %s --user ‘%s:%s’ ‘%s/%s’”,
CURL, @verboseFlag, @user, @pass, @url, CGI.escape(path)
IO.popen(command, “r”, &block)
raise “Curl error: #{$?.to_i / 256}” if $? != 0
end

end

ftp = CurlFtp.new(‘ftp://localhost:21’, ‘bcastill’, ‘pass’, false)

ftp.put(’/upload/file.txt’) do |io|
io.puts(“Writing to FTP server…”)
end

puts “Getting data:”
ftp.get(’/upload/file.txt’) do |io|
io.each_line do |line|
puts “LINE: #{line}”
end
end


#4

On Mar 20, 10:51 pm, removed_email_address@domain.invalid wrote:

  • there’s some library called chilkat, but it’s not free (for this
    Could you please give me a hint?
    (3 months ago I received a spec saying my company would communicate
    the curl C interface.
    @url = url
    raise “Curl error: #{$?.to_i / 256}” if $? != 0

(In case it wasn’t obvious, you should change ftp to ftps in the url
and you may need to supply a port.)


#5

Thank you for your reply! I should mention the difference between sftp
and ftps to avoid confusion.

Good point with this ftptls library but it can’t encrypt the data
channel, just the command channel.

This curl solution is probably ok but as I post in the first post, I
consider this as the last possibility.

Nevertheless, I found the ultimate solution :wink: This FTPFXPTLS can be
used with no problems as a normal ftp, it was just my lack of
understanding Ruby. So if anyone is interested: use gem to install
ftpfxp and then use FTPFXPTLS instead of ftp. It’s working like a
charm but nowhere on the net mentioned…

Jan