socket emergency

[Xiangrong Fang]

Hi,

I had a problem when using Winsock in ruby. I tried various ways, but to
no avail. The situation is that I need to write a simple POP3 client
that pool the pop server. This is normally ok. But currently the PC
installed a version or Norman Virus Control which controls the POP3 port
(it is a proxy).

There is something strange with NVC. The symptom is that if I use my
email client to connect to it, that's fine. If I use windows Telnet, I
only get the "+OK POP3 Server Ready" prompt. After I enter "USER xxx",
or even "QUIT", it does NOT reply anything, just hang there.

I tried using the ruby Socket class and TCPSocket class the result is
same. i.e., it will hang when I use the "recv()" method. Please refer to
the following sample code:

irb(main):001:0> require 'socket'
=> true
irb(main):002:0> t = TCPSocket.new('127.0.0.1', 110)
=> #<TCPSocket:0x2aa0230>
irb(main):006:0> t.recv(100)
=> "+OK POP3 Server Ready\r\n"
irb(main):007:0> t.send('USER xrfang@172.18.2.1\r\n', 0)
=> 26
irb(main):008:0> t.recv(100)
^CTerminate batch job (Y/N)? ^C

The irb is frozen and I pressed ^C.

Another piece of code:

irb(main):003:0> t = TCPSocket.new('127.0.0.1', 110)
=> #<TCPSocket:0x2a94098>
irb(main):005:0> t.readline
=> "+OK POP3 Server Ready\r\n"
irb(main):006:0> t.puts('USER xrfang@172.18.2.1')
=> nil
irb(main):007:0> t.readline
=> "+OK\r\n"
irb(main):008:0> t.puts('PASS xrfang')
Errno::EINVAL: Invalid argument
from (irb):8:in `write'
from (irb):8:in `puts'
from (irb):8
irb(main):009:0>

I don't know why the first "puts" is ok, while the second generated
Errno::EINVAL exception.

I also tried using Socket, not TCPSocket, but the result is similar.

Thank you very much for any advices.

Shannon
--
Xiangrong Fang <xrfang@hotmail.com>

[ts]

>>>>> "X" == Xiangrong Fang <xrfang@hotmail.com> writes:

X> irb(main):007:0> t.send('USER xrfang@172.18.2.1\r\n', 0)
X> => 26

Be carefull with '' and \r \n

svg% ruby
p 'aa\r\n'.size
p "aa\r\n".size
^D
6
4
svg%

try to use


t.send("USER xrfang@172.18.2.1\r\n", 0)


Guy Decoux

[Shannon Fang]

Hi,

I'm sorry about the mistake, this is a typo. Please refer to the following
code:

irb(main):018:0> t = TCPSocket.new('127.0.0.1', 110)
=> #<TCPSocket:0x2b28320>
irb(main):019:0> t.readline
=> "+OK POP3 Server Ready\r\n"
irb(main):020:0> t.send("USER xrfang@172.18.2.1\n", 0)
=> 23
irb(main):021:0> t.readline
=> "+OK\r\n"
irb(main):022:0> t.send("PASS xrfang\n", 0)
=> 19
irb(main):023:0> t.readline
=> "+OK\r\n"
irb(main):024:0> t.send("STAT\n", 0)
=> 5
irb(main):025:0> t.readline
=> "+OK 5 10631\r\n"
irb(main):026:0> t.send("RETR 1", 0)
=> 6
irb(main):027:0> t.readline

After the final readline, it hang up again. I don't know the exact
difference between t.readline and t.recv, but they both hang.

Thanks,
Shannon

>From: ts <decoux@moulon.inra.fr>
>Reply-To: [email]ruby-talk@ruby-lang.org[/email]
>To: [email]ruby-talk@ruby-lang.org[/email] (ruby-talk ML)
>CC: [email]ruby-talk@ruby-lang.org[/email]
>Subject: Re: socket emergency
>Date: Wed, 20 Aug 2003 22:18:20 +0900
>

> >>>>> "X" == Xiangrong Fang <xrfang@hotmail.com> writes:

>
>X> irb(main):007:0> t.send('USER xrfang@172.18.2.1\r\n', 0)
>X> => 26
>
> Be carefull with '' and \r \n
>
>svg% ruby
>p 'aa\r\n'.size
>p "aa\r\n".size
>^D
>6
>4
>svg%
>
> try to use
>
>
> t.send("USER xrfang@172.18.2.1\r\n", 0)
>
>
>Guy Decoux
>
>

__________________________________________________ _______________
Tired of 56k? Get a FREE BT Broadband connection
[url]http://www.msn.co.uk/specials/btbroadband[/url]

[Philipp Ott]

Xiangrong Fang wrote:

> Hi,
>
> I had a problem when using Winsock in ruby. I tried various ways, but to
> no avail. The situation is that I need to write a simple POP3 client
> [...]
> same. i.e., it will hang when I use the "recv()" method. Please refer to
> [...]
> irb(main):007:0> t.send('USER xrfang@172.18.2.1\r\n', 0)

Strange this with the telnet, this should work.

I think your code didnt work because of the \r and \n literals in the
msg exchange. So you need to use double-quotes " for the string or
stay with .puts but without the CR LF.

> [...]
> Thank you very much for any advices.

irb(main):001:0> require 'socket'
=> true
irb(main):002:0> t = TCPsocket.new('mail.avalon.at',110)
=> #<TCPSocket:0x400d1d98>
irb(main):003:0> t.readline
=> "+OK ready <13032.1061385513@ns4.avalon.at>\r\n"
irb(main):004:0> t.puts('USER philipp')
=> nil
irb(main):005:0> t.readline
=> "+OK Password required for philipp.\r\n"
irb(main):006:0> t.puts('PASS test123')
=> nil
irb(main):007:0> t.readline
=> "-ERR [AUTH] Password supplied for \"philipp\" is incorrect.\r\n"
irb(main):008:0> t.puts('quit')
=> nil
irb(main):009:0> t.readline
=> "+OK Pop server at ns4.avalon.at signing off.\r\n"


hope it helps
Philipp Ott

[Michael Campbell]

> > Hi,

> >
> > I had a problem when using Winsock in ruby. I tried various ways, but to
> > no avail. The situation is that I need to write a simple POP3 client
> > [...]
> > same. i.e., it will hang when I use the "recv()" method. Please refer to
> > [...]
> > irb(main):007:0> t.send('USER xrfang@172.18.2.1\r\n', 0)

>
> Strange this with the telnet, this should work.
>
> I think your code didnt work because of the \r and \n literals in the
> msg exchange. So you need to use double-quotes " for the string or
> stay with .puts but without the CR LF.

I'm wondering why the net/pop.rb library isn't sufficient?

[Shannon Fang]

I am _very_ sorry as this is a typo again. Please see following code:

irb(main):001:0> require 'socket'
=> true
irb(main):002:0> t= TCPSocket.new('127.0.0.1', 110)
=> #<TCPSocket:0x2aa0908>
irb(main):003:0> t.gets
=> "+OK POP3 Server Ready\r\n"
irb(main):004:0> t.send("USER xrfang@172.18.2.1\n", 0)
=> 23
irb(main):005:0> t.gets
=> "+OK\r\n"
irb(main):006:0> t.send("PASS xrfang\n", 0)
=> 12
irb(main):007:0> t.gets
=> "+OK\r\n"
irb(main):008:0> t.send("RETR 4\n", 0)
=> 7
irb(main):009:0> t.gets
=> "+OK\r\n"
irb(main):010:0> t.gets

It hangs here.

Sincerely,
Shannon

>From: ts <decoux@moulon.inra.fr>
>Reply-To: [email]ruby-talk@ruby-lang.org[/email]
>To: [email]ruby-talk@ruby-lang.org[/email] (ruby-talk ML)
>CC: [email]ruby-talk@ruby-lang.org[/email]
>Subject: Re: socket emergency
>Date: Wed, 20 Aug 2003 22:39:32 +0900
>

> >>>>> "S" == Shannon Fang <xrfang@hotmail.com> writes:

>
>S> irb(main):026:0> t.send("RETR 1", 0)
> ^^^^^^
>
> You have forgotten \n
>
>S> => 6
>
>
>Guy Decoux
>

__________________________________________________ _______________
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[Shannon Fang]

Hi Guy and all Rubyists,

Thank you very much for all the help. For me, it is not very convenient to
use net/pop in this client application. However I also tried that one. The
result is failure. Please refer to the following code:

irb(main):001:0> require 'net/pop'
=> true
irb(main):002:0> Net::POP3.start('127.0.0.1', 110,
'xrfang@172.18.2.1','xrfang') { |pop|
irb(main):003:1* if pop.mails.empty?
irb(main):004:2> puts 'no mail.'
irb(main):005:2> else
irb(main):006:2* i=0
irb(main):007:2> pop.each_mail do |m|
irb(main):008:3* puts m.pop
irb(main):009:3> m.delete
irb(main):010:3> i += 1
irb(main):011:3> end
irb(main):012:2> puts "#{pop.mails.size} mails popped."
irb(main):013:2> end
irb(main):014:1> }
TimeoutError: socket read timeout (60 sec)
from c:/ruby/lib/ruby/1.6/net/protocol.rb:618:in `on_read_timeout'
from c:/ruby/lib/ruby/1.6/net/protocol.rb:612:in `rbuf_fill'
from c:/ruby/lib/ruby/1.6/net/protocol.rb:551:in `readuntil'
from c:/ruby/lib/ruby/1.6/net/protocol.rb:577:in `read_pendstr'
from c:/ruby/lib/ruby/1.6/net/pop.rb:562:in `retr'
from c:/ruby/lib/ruby/1.6/net/pop.rb:561:in `atomic'
from c:/ruby/lib/ruby/1.6/net/pop.rb:561:in `retr'
from c:/ruby/lib/ruby/1.6/net/pop.rb:481:in `pop'
from (irb):8
from (irb):7:in `each'
from c:/ruby/lib/ruby/1.6/net/pop.rb:421:in `each_mail'
from (irb):7
from (irb):2:in `start'
from c:/ruby/lib/ruby/1.6/net/protocol.rb:71:in `start'
from c:/ruby/lib/ruby/1.6/net/protocol.rb:71:in `start'
from (irb):2
irb(main):015:0>

I don't know what on earth is it doing :-((((

thanks!
Shannon

>From: ts <decoux@moulon.inra.fr>
>Reply-To: [email]ruby-talk@ruby-lang.org[/email]
>To: [email]ruby-talk@ruby-lang.org[/email] (ruby-talk ML)
>CC: [email]ruby-talk@ruby-lang.org[/email]
>Subject: Re: socket emergency
>Date: Thu, 21 Aug 2003 00:03:45 +0900
>

> >>>>> "S" == Shannon Fang <xrfang@hotmail.com> writes:

>
>S> It hangs here.
>
> Have you tried with the module 'net/pop' to see if it do the same ?
>
>=== Enshort Code
>
>The example above is very verbose. You can enshort code by using
>some utility methods. At first, block form of Net::POP3.start can
>alternates POP3.new, POP3#start and POP3#finish.
>
> require 'net/pop'
>
> Net::POP3.start('pop.example.com', 110,
> 'YourAccount', 'YourPassword') {|pop|
> if pop.mails.empty?
> puts 'no mail.'
> else
> i = 0
> pop.each_mail do |m| # or "pop.mails.each ..."
> File.open("inbox/#{i}", 'w') {|f|
> f.write m.pop
> }
> m.delete
> i += 1
> end
> puts "#{pop.mails.size} mails popped."
> end
> }
>
>
>
>Guy Decoux
>

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[Shannon Fang]

Oh I forgot to mention that while you comment on this, please note that the
local POP server (Norman) is ok, because I tried several mail clients it
worked (Becky, OE, Outlook...).

Thanks!
Shannon

>From: ts <decoux@moulon.inra.fr>
>Reply-To: [email]ruby-talk@ruby-lang.org[/email]
>To: [email]ruby-talk@ruby-lang.org[/email] (ruby-talk ML)
>CC: [email]ruby-talk@ruby-lang.org[/email]
>Subject: Re: socket emergency
>Date: Thu, 21 Aug 2003 00:03:45 +0900
>

> >>>>> "S" == Shannon Fang <xrfang@hotmail.com> writes:

>
>S> It hangs here.
>
> Have you tried with the module 'net/pop' to see if it do the same ?
>
>=== Enshort Code
>
>The example above is very verbose. You can enshort code by using
>some utility methods. At first, block form of Net::POP3.start can
>alternates POP3.new, POP3#start and POP3#finish.
>
> require 'net/pop'
>
> Net::POP3.start('pop.example.com', 110,
> 'YourAccount', 'YourPassword') {|pop|
> if pop.mails.empty?
> puts 'no mail.'
> else
> i = 0
> pop.each_mail do |m| # or "pop.mails.each ..."
> File.open("inbox/#{i}", 'w') {|f|
> f.write m.pop
> }
> m.delete
> i += 1
> end
> puts "#{pop.mails.size} mails popped."
> end
> }
>
>
>
>Guy Decoux
>

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