ruby-net-ldap/lib/net/ldap/pdu.rb

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# $Id$
#
# LDAP PDU support classes
#
#
#----------------------------------------------------------------------------
#
# Copyright (C) 2006 by Francis Cianfrocca. All Rights Reserved.
#
# Gmail: garbagecat10
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#---------------------------------------------------------------------------
#
module Net
class LdapPduError < Exception; end
class LdapPdu
BindResult = 1
SearchReturnedData = 4
SearchResult = 5
ModifyResponse = 7
AddResponse = 9
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DeleteResponse = 11
ModifyRDNResponse = 13
attr_reader :msg_id, :app_tag
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attr_reader :search_dn, :search_attributes, :search_entry
#
# initialize
# An LDAP PDU always looks like a BerSequence with
# two elements: an integer (message-id number), and
# an application-specific sequence.
# The application-specific tag in the sequence tells
# us what kind of packet it is, and each kind has its
# own format, defined in RFC-1777.
# Observe that many clients (such as ldapsearch)
# do not necessarily enforce the expected application
# tags on received protocol packets. This implementation
# does interpret the RFC strictly in this regard, and
# it remains to be seen whether there are servers out
# there that will not work well with our approach.
#
def initialize ber_object
begin
@msg_id = ber_object[0].to_i
@app_tag = ber_object[1].ber_identifier - 0x60
rescue
# any error becomes a data-format error
raise LdapPduError.new( "ldap-pdu format error" )
end
case @app_tag
when BindResult
parse_ldap_result ber_object[1]
when SearchReturnedData
parse_search_return ber_object[1]
when SearchResult
parse_ldap_result ber_object[1]
when ModifyResponse
parse_ldap_result ber_object[1]
when AddResponse
parse_ldap_result ber_object[1]
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when DeleteResponse
parse_ldap_result ber_object[1]
when ModifyRDNResponse
parse_ldap_result ber_object[1]
else
raise LdapPduError.new( "unknown pdu-type: #{@app_tag}" )
end
end
#
# result_code
# This returns an LDAP result code taken from the PDU,
# but it will be nil if there wasn't a result code.
# That can easily happen depending on the type of packet.
#
def result_code code = :resultCode
@ldap_result and @ldap_result[code]
end
private
#
# parse_ldap_result
#
def parse_ldap_result sequence
sequence.length >= 3 or raise LdapPduError
@ldap_result = {:resultCode => sequence[0], :matchedDN => sequence[1], :errorMessage => sequence[2]}
end
#
# parse_search_return
# Definition from RFC 1777 (we're handling application-4 here)
#
# Search Response ::=
# CHOICE {
# entry [APPLICATION 4] SEQUENCE {
# objectName LDAPDN,
# attributes SEQUENCE OF SEQUENCE {
# AttributeType,
# SET OF AttributeValue
# }
# },
# resultCode [APPLICATION 5] LDAPResult
# }
#
# We concoct a search response that is a hash of the returned attribute values.
# NOW OBSERVE CAREFULLY: WE ARE DOWNCASING THE RETURNED ATTRIBUTE NAMES.
# This is to make them more predictable for user programs, but it
# may not be a good idea. Maybe this should be configurable.
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# ALTERNATE IMPLEMENTATION: In addition to @search_dn and @search_attributes,
# we also return @search_entry, which is an LDAP::Entry object.
# If that works out well, then we'll remove the first two.
#
def parse_search_return sequence
sequence.length >= 2 or raise LdapPduError
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@search_entry = LDAP::Entry.new( sequence[0] )
@search_dn = sequence[0]
@search_attributes = {}
sequence[1].each {|seq|
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@search_entry[seq[0]] = seq[1]
@search_attributes[seq[0].downcase.intern] = seq[1]
}
end
end
end # module Net