Research And Application Of LDAP Message Encoding And Decoding Based On BER

Data Center is becoming more and more important for telecommunication operation. Common Profile Storage Framework (CPSF) proposed in 3GPP TR.32.808 is a direction to build a Data Center. CPS needs to support a variety of access interfaces, including the adoption of XML access to LDAP data. As XML model is more flexible than LDAP model, when XML applications convert to LDAP applications, traditional method of calling LDAP API function has large limitations, controllability is not strong, and it is difficult to cope with the complexity of XML application. As a result, we have made self-encoding/decoding LDAP information with a view to improve LDAP application flexibility and scalability.RFC4511 LDAP provides the basic format of LDAP message, the use the BER (Basic encoding rules) in ASN.1. In this paper, base on in-depth understanding of RFC4511 and BER in ASN.1, the study of self-encoding/decoding method was made to build and read LDAP message. Under RFC4511 LDAP, the encoding and decoding method of the SEQUENCE structure in internal organization of LDAP message and main types of data were presented, and through the study of basic LDAP message including Bind, Search, Create, Modify, and Delete to achieve the self-encoding method of the expansion messages including Subscribe, Notice, and so on. By using self-encoding/decoding methods, a number of LDAP messages can be generated in parallel, sended and received asynchronously. Lastly, the implementation method of the asynchronous parallel processing LDAP message is given.