Ruby-ldap and paged results on windows

Hi-
I’m trying to get paged results to work with ruby-ldap against
Active Directory in Windows. I compiled ruby-ldap 0.9.7 following the
directions on
http://www.turnofthecrank.com/2006/09/11/ruby-ldap-and-win32/

Then I tried to run this code I found. The error I get is that ruby
can’t find the constant LDAP_CONTROL_PAGEDRESULTS and if I put
LDAP.constants it’s not listed. Any ideas?

require ‘ldap’

Find a PagedResults control in an Array of LDAP controls.

def paged_results_ctl( ctls )
ctls.each do |ctl|
return ctl if ctl.oid == LDAP::LDAP_CONTROL_PAGEDRESULTS
end

nil
end

unless ARGV[0]
$stderr.puts “Please give a page size.”
exit
end
page_size = ARGV[0].to_i
cookie = ‘’
critical = true

conn = LDAP::Conn.new( ‘foo.corp.google.com’, 389 )
conn.set_option( LDAP::LDAP_OPT_PROTOCOL_VERSION, 3 )
conn.bind( ‘user’, ‘password’ )

search = 0
total = 0

loop do
ber_string = LDAP::Control.encode( page_size, cookie )
control = LDAP::Control.new( LDAP::LDAP_CONTROL_PAGEDRESULTS,
ber_string,
critical )
conn.set_option( LDAP::LDAP_OPT_SERVER_CONTROLS, [control] )

count = 0

In this patched version of ruby-ldap, Conn#search no longer returns

self.

Instead, it returns an Array of LDAP referrals and controls, each of

which is also an Array.

conn.search( ‘ou=users,ou=nyc,dc=corp,dc=google,dc=com’,
LDAP::LDAP_SCOPE_SUBTREE, ‘cn=*’, [‘cn’]) do |x|
count += 1
end

printf( “Page %d has %d entries.\n”, search += 1, count )
printf( “That’s %d entries in total.\n”, total += count )

Get the PagedResults control from the list of controls set by the

last search operation.

control = paged_results_ctl( conn.controls )

How many entries does the server estimate are left?

Also, get the cookie returned by the last search.

returned_size, cookie = control.decode
puts “Returned size = #{returned_size}” if $DEBUG

According to RFC 2696, the server may not be able to estimate the

number

of results outstanding. In that case, it will return zero, so we

should

only use the new size if it is non-zero.

page_size = returned_size if returned_size > 0

puts “Returned cookie = #{cookie.inspect}” if $DEBUG

break if cookie.empty?

puts
end

On 8/21/07, Dave K. [email protected] wrote:

Hi-
I’m trying to get paged results to work with ruby-ldap against
Active Directory in Windows. I compiled ruby-ldap 0.9.7 following the
directions on
http://www.turnofthecrank.com/2006/09/11/ruby-ldap-and-win32/

Then I tried to run this code I found. The error I get is that ruby
can’t find the constant LDAP_CONTROL_PAGEDRESULTS and if I put
LDAP.constants it’s not listed. Any ideas?

The literal value of the control is “1.2.840.113556.1.4.319”
You might try defining that in your code and see if it works. (If you
have
sharp eyes you’ll notice that the enterprise number in the OID belongs
to
Microsoft. Paged controls started life as a hack to make Active
Directory
performance slightly less horrible.)

If you’re still having trouble, try the Net::LDAP library. It supports
paged
results transparently.

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