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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// File contains Compare functionality
//
// https://tools.ietf.org/html/rfc4511
//
// CompareRequest ::= [APPLICATION 14] SEQUENCE {
// entry LDAPDN,
// ava AttributeValueAssertion }
//
// AttributeValueAssertion ::= SEQUENCE {
// attributeDesc AttributeDescription,
// assertionValue AssertionValue }
//
// AttributeDescription ::= LDAPString
// -- Constrained to <attributedescription>
// -- [RFC4512]
//
// AttributeValue ::= OCTET STRING
//
package ldap
import (
"errors"
"fmt"
"gopkg.in/asn1-ber.v1"
)
// Compare checks to see if the attribute of the dn matches value. Returns true if it does otherwise
// false with any error that occurs if any.
func (l *Conn) Compare(dn, attribute, value string) (bool, error) {
messageID := l.nextMessageID()
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, messageID, "MessageID"))
request := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationCompareRequest, nil, "Compare Request")
request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, dn, "DN"))
ava := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "AttributeValueAssertion")
ava.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, attribute, "AttributeDesc"))
ava.AppendChild(ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagOctetString, value, "AssertionValue"))
request.AppendChild(ava)
packet.AppendChild(request)
l.Debug.PrintPacket(packet)
channel, err := l.sendMessage(packet)
if err != nil {
return false, err
}
if channel == nil {
return false, NewError(ErrorNetwork, errors.New("ldap: could not send message"))
}
defer l.finishMessage(messageID)
l.Debug.Printf("%d: waiting for response", messageID)
packet = <-channel
l.Debug.Printf("%d: got response %p", messageID, packet)
if packet == nil {
return false, NewError(ErrorNetwork, errors.New("ldap: could not retrieve message"))
}
if l.Debug {
if err := addLDAPDescriptions(packet); err != nil {
return false, err
}
ber.PrintPacket(packet)
}
if packet.Children[1].Tag == ApplicationCompareResponse {
resultCode, resultDescription := getLDAPResultCode(packet)
if resultCode == LDAPResultCompareTrue {
return true, nil
} else if resultCode == LDAPResultCompareFalse {
return false, nil
} else {
return false, NewError(resultCode, errors.New(resultDescription))
}
}
return false, fmt.Errorf("Unexpected Response: %d", packet.Children[1].Tag)
}
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