Cidr.rb: port of Perl's Net::CIDR v0.11 available

Jos_B · November 29, 2006, 8:44am

Module:

http://www.catnook.com/programs/cidr.rb

Simple test program:

http://www.catnook.com/programs/cidrtest.rb

Not sure about the license. Hope this is useful to someone.

As an aside: anyone have a port of Net::Ping they are willing to share?
I’m
trying to convert some code (and colleagues!) to Ruby and am running
into the
“missing libraries” issue…

Jos_B · November 29, 2006, 9:36am

Hi,

As an aside: anyone have a port of Net::Ping they are willing to share? I’m
trying to convert some code (and colleagues!) to Ruby and am running into the
“missing libraries” issue…

Check the RAA (and Rubyforge).

For ping, there is ‘ping’ in the standard library, and ‘net/ping’ on the
RAA (‘gem install net-ping’).

Pat Eyler wrote in May about pushing an ICMP-capable version of net/ping
into the standard library for 1.8.6.

Cheers,
Dave

Jos_B · November 29, 2006, 5:07pm

Dave B. wrote:

Pat Eyler wrote in May about pushing an ICMP-capable version of net/ping
into the standard library for 1.8.6.

Cheers,
Dave

Indeed, Pat talked to me about possibly including net-ping in the
standard lib, though it needs a PingICMP class. It could probably
stand a bit of reorganization, too.

In fact, I still have some code laying around that Sean C. sent
to me a long time ago. Maybe it’s time to revisit that.

Regards,

Dan

Jos_B · November 29, 2006, 5:13pm

On 11/29/06, Daniel B. [email protected] wrote:

Dave B. wrote:

For ping, there is ‘ping’ in the standard library, and ‘net/ping’ on the
RAA (‘gem install net-ping’).

ugh! I hate ping.

I’ve actually done some work on the code, but it’s in need of some
documentation and a bit more polish. The ICMP ping still needs
to be integrated as well.

I just have more ambition than time, talent, and energy.

Jos_B · November 29, 2006, 10:27pm

pat eyler wrote:

stand a bit of reorganization, too.

I’ve actually done some work on the code, but it’s in need of some
documentation and a bit more polish. The ICMP ping still needs
to be integrated as well.

I just have more ambition than time, talent, and energy.

It sounds simple enough for a Ruby Q… Then we’d have not two, but a
dozen versions, possibly including a Net::Ping-interfaced one for Jos!

Dave

Jos_B · November 29, 2006, 10:43pm

On Nov 29, 2006, at 3:25 PM, Dave B. wrote:

Indeed, Pat talked to me about possibly including net-ping in the
dozen versions, possibly including a Net::Ping-interfaced one for Jos!
I’m a huge fan of using the Ruby Q. to improve libraries like
this. I’m a Ping Dummy, so you guys put your heads together and
write up something that explains the goals and if I can understand
them, we’ve got a winner.

It takes a lot less time, talent, and energy to define the problem
well enough to get help from the whole community and the results
never cease to dazzle me…

James Edward G. II

Jos_B · November 30, 2006, 4:22pm

Jos B. wrote:

Check the RAA (and Rubyforge).

For ping, there is ‘ping’ in the standard library, and ‘net/ping’ on the
RAA (‘gem install net-ping’).

I’m aware of those but they lack some features the Perl version has. Notably
ICMP support and returning timing information.

Well, there is PingExternal for ICMP support.

Seriously, though, both would be good additions.

It would also be nice for there to be a single Net::Ping class, just like the
Perl version provides, wrapping/hiding the specialized classes. That seems
like an easy addition.

The API was modelled after the current ping.rb in the standard library
to try to keep things consistant and more portable for anyone switching
from ping.rb to my net-ping module. A factory pattern should be doable
if that’s what folks want. In practice, however, I don’t see it as a
major issue, and probably not worth the API breakage.

Regards,

Dan

Jos_B · November 29, 2006, 6:58pm

Hi Dave,

On Wed, Nov 29, 2006 at 05:35:13PM +0900, Dave B. wrote:

Hi,

As an aside: anyone have a port of Net::Ping they are willing to share? I’m
trying to convert some code (and colleagues!) to Ruby and am running into the
“missing libraries” issue…

Check the RAA (and Rubyforge).

For ping, there is ‘ping’ in the standard library, and ‘net/ping’ on the
RAA (‘gem install net-ping’).

I’m aware of those but they lack some features the Perl version has.
Notably
ICMP support and returning timing information.

It would also be nice for there to be a single Net::Ping class, just
like the
Perl version provides, wrapping/hiding the specialized classes. That
seems
like an easy addition.

Pat Eyler wrote in May about pushing an ICMP-capable version of net/ping
into the standard library for 1.8.6.

/me crosses fingers…

Cheers,

Jos_B · November 30, 2006, 6:36pm

On Fri, Dec 01, 2006 at 12:20:36AM +0900, Daniel B. wrote:
[snip]

I’m aware of those but they lack some features the Perl version has.
Notably
ICMP support and returning timing information.

Well, there is PingExternal for ICMP support.

Seriously, though, both would be good additions.

Indeed.

It would also be nice for there to be a single Net::Ping class, just like
the
Perl version provides, wrapping/hiding the specialized classes. That seems
like an easy addition.

The API was modelled after the current ping.rb in the standard library
to try to keep things consistant and more portable for anyone switching
from ping.rb to my net-ping module. A factory pattern should be doable
if that’s what folks want. In practice, however, I don’t see it as a
major issue, and probably not worth the API breakage.

It eases the transition from Perl, as in my case. If you mean something
like
the following then that would be great:

lizzy:/tmp% cat r
class Ping
  def self.create(type, *args)
case type
when :foo
  FooPing.new
when :bar
  BarPing.new
end
  end
end

class FooPing < Ping
  def ping(host)
puts "#{self.class}: pinging #{host}"
  end
end

class BarPing < Ping
  def ping(host)
puts "#{self.class}: pinging #{host}"
  end
end

pinger = Ping.create(:bar)
pinger.ping("myhost")
lizzy:/tmp% ruby r
BarPing: pinging myhost
lizzy:/tmp%

Let me know what I can do to help move this along.

Jos_B · December 1, 2006, 8:41pm

On Fri, Dec 01, 2006 at 04:47:05AM +0900, Daniel B. wrote:

Well, you could start by porting the ping_icmp() function from Ping.pm
to Ruby. I started working on it but I got stuck and I need to work on
other things. Below is what I’ve got so far:

I’ve made some progress; see attached. Let me know what you think.

Jos_B · November 30, 2006, 8:49pm

Jos B. wrote:

> when :foo > end > lizzy:/tmp% ruby r > BarPing: pinging myhost > lizzy:/tmp% > > Let me know what I can do to help move this along. > > Well, you could start by porting the ping_icmp() function from Ping.pm to Ruby. I started working on it but I got stuck and I need to work on other things. Below is what I've got so far:

require ‘net/ping’

module Net
class Ping::ICMP < Ping

  ICMP_ECHOREPLY = 0
  ICMP_ECHO      = 8
  ICMP_SUBCODE   = 0
  ICMP_FLAGS     = 0
  ICMP_PORT      = 0

  def initialize(*args)
     super(args)
     raise 'requires root privileges' if Process.euid > 0 # unsure
     @seq = 0
     @data_size = 0
     @data = ""
  end

  def checksum(msg)
     length    = msg.length
     num_short = length / 2
     check     = 0

     msg.unpack("n#{num_short}").each do |short|
        check += short
     end

     if length % 2 > 0
        check += msg[length-1, 1].unpack('C') << 8
     end

     check = (check >> 16) + (check & 0xffff)
     return (~((check >> 16) + check) & 0xffff)
  end

  def ping
     socket = Socket.new(
        Socket::PF_INET,
        Socket::SOCK_RAW,
        Socket::IPPROTO_ICMP
     )

     @seq = (@seq + 1) % 65536
     checksum = 0

     pstring = "C2 n3 A" << @data_size.to_s
     pid = Process.pid

     msg = [ICMP_ECHO, ICMP_SUBCODE, checksum, pid, @seq,

@data].pack(pstring)
# TODO: finish
end
end
end

Regards,

Dan

Jos_B · December 1, 2006, 8:55pm

Jos B. wrote:

ICMP_STRUCT    = 'C2 n3 A'
  @pid = Process.pid & 0xffff

  socket = Socket.new(
  checksum = checksum(msg)

      from_pid = -1
        if recv_msg.length >= 56
        done = true

end

p = Net::Ping::ICMP.new
p p.ping(ARGV.shift, 5)

Seems to work. Mind if I include with the next release of net-ping
(with acknowledgements, of course).

The only tweak I would make are to have it return true or false, instead
of 1 or nil.

Regards,

Dan

Jos_B · December 1, 2006, 9:37pm

On Sat, Dec 02, 2006 at 04:54:49AM +0900, Daniel B. wrote:

Jos B. wrote:
Seems to work. Mind if I include with the next release of net-ping
(with acknowledgements, of course).

Of course, thanks Daniel.

The only tweak I would make are to have it return true or false, instead
of 1 or nil.

Good idea. Now, the Perl Net::Ping library returns duration:

($ret, $duration, $ip) = $p->ping($host, $timeout);

In array context, the elapsed time as well as the string form of the

ip
the host resolved to are also returned.

What would be the best way to add that to the Ruby version? Obviously
one
would want all Net::Ping classes to support this. I have a local utility
that
uses this information, which is why I need it.

Cheers,

Jos_B · December 1, 2006, 10:05pm

Jos B. wrote:

On Sat, Dec 02, 2006 at 04:54:49AM +0900, Daniel B. wrote:

Jos B. wrote:
Seems to work. Mind if I include with the next release of net-ping
(with acknowledgements, of course).

Of course, thanks Daniel.

Great, thanks.

What would be the best way to add that to the Ruby version? Obviously one
would want all Net::Ping classes to support this. I have a local utility that
uses this information, which is why I need it.

Cheers,

Hm, I’ll have to think about the API. I suppose the most simple
approach is to just add accessors for duration and ip_address (with a
‘nil’ value by default). In practice, then, your code would look like
this:

if p.ping?
puts p.ip_address
puts p.duration
end

How does that look?

Regards,

Dan

Jos_B · December 1, 2006, 10:15pm

On Sat, Dec 02, 2006 at 06:03:59AM +0900, Daniel B. wrote:

Hm, I’ll have to think about the API. I suppose the most simple
approach is to just add accessors for duration and ip_address (with a
‘nil’ value by default). In practice, then, your code would look like this:

if p.ping?
puts p.ip_address
puts p.duration
end

How does that look?

I like this much better than the positional API that Perl uses here (“Is
duration the 1st or 2nd return value?”). Plus it makes it easy to add
futher
items down the road without breaking existing code. +1.

Jos_B · December 2, 2006, 6:17pm

On Sat, Dec 02, 2006 at 08:50:12PM +0900, Daniel B. wrote:

Ok, I’ll add those. However, don’t put too much stock in the duration.
Looking at the Perl code, it isn’t much more than this:

start = Time.now
p.ping?
duration = Time.now - start

True, but one would want the timing measurement to be done as close as
possible around the send and the recvfrom, eliminating the avoidable
overhead
of the method call and setup inside it being included in the duration.
Plus,
having .duration is convenient, no?

And you can get the ip via IPSocket.getaddress(host)

Agreed. That functionality doesn’t belong in this module.

Jos_B · December 2, 2006, 12:51pm

Jos B. wrote:

How does that look?

I like this much better than the positional API that Perl uses here (“Is
duration the 1st or 2nd return value?”). Plus it makes it easy to add futher
items down the road without breaking existing code. +1.

Ok, I’ll add those. However, don’t put too much stock in the duration.
Looking at the Perl code, it isn’t much more than this:

start = Time.now
p.ping?
duration = Time.now - start

And you can get the ip via IPSocket.getaddress(host)

Regards,

Dan