// 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) { packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request") packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "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) msgCtx, err := l.sendMessage(packet) if err != nil { return false, err } defer l.finishMessage(msgCtx) l.Debug.Printf("%d: waiting for response", msgCtx.id) packetResponse, ok := <-msgCtx.responses if !ok { return false, NewError(ErrorNetwork, errors.New("ldap: response channel closed")) } packet, err = packetResponse.ReadPacket() l.Debug.Printf("%d: got response %p", msgCtx.id, packet) if err != nil { return false, err } 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) }