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Inside Macintosh: Networking /


Chapter 5 - AppleTalk Data Stream Protocol (ADSP)

This chapter describes the AppleTalk Data Stream Protocol (ADSP) that you use to establish a session to exchange data between two network processes or applications in which both parties have equal control over the communication. You should read this chapter if you want to write an application that supports the exchange of more than a small amount of data between two parties who each can both send and receive streams of data.

This chapter also describes the AppleTalk Secure Data Stream Protocol (ASDSP), a secure version of ADSP, that allows users of your application to communicate over an ADSP session after the users' identities have been authenticated. Users can then exchange encrypted data over the session. For your application to use ASDSP, the system on which it runs must have the AppleTalk Open Collaboration Environment (AOCE) software installed and must have access to an AOCE server. To use ASDSP, you must also use the Authentication Manager, which is a component of the AOCE software. For information on the Authentication Manager, refer to Inside Macintosh: AOCE Application Programming Interfaces.

ASDSP enhances ADSP with authentication and encryption features. When this chapter discusses components of ADSP, such as connection ends and connection listeners, you can assume that the information also applies to ASDSP. The sections in this chapter that discuss ASDSP describe any specific differences between it and the standard version of ADSP. To use ASDSP, you should be familiar with ADSP.

For an overview of ADSP and how it fits within the AppleTalk protocol stack, read the chapter "Introduction to AppleTalk" in this book, which also introduces and defines some of the terminology used in this chapter. For a complete explanation of the ADSP specification, see Inside AppleTalk, second edition.


Chapter Contents
About ADSP
Connections, Connection Ends, and Connection States
Connection Listeners
Reliable Delivery of Data
Unsolicited ADSP Events
About ASDSP
The Authentication Process
The Data Encryption Feature
Using ADSP
Allocating Memory for ADSP
Creating and Using a Connection Control Block
Opening and Maintaining an ADSP Connection
Creating and Using a Connection Listener
Writing a User Routine for Connection Events
Using ASDSP
Opening a Secure Connection
From the Initiator's End
From the Recipient End
Sending Encrypted Data Across a Secure Connection
ADSP Reference
Data Structures
The ADSP Connection Control Block Record
The Address Block Record
The DSP Parameter Block
The ASDSP Parameter Block
The TRSecureParams Record
Routines
DESCRIPTION
Establishing and Terminating an ADSP Connection
Establishing and Terminating an ADSP Connection Listener
Maintaining an ADSP Connection and Using It to Exchange Data
Summary of ADSP
Pascal Summary
Constants
Data Types
The ADSP Connection Control Block Record
The Address Block Record
The DSP Parameter Block
The ASDSP Parameter Block
The TRSecureParams Record
C Summary
Constants
Data Types
The ADSP Connection Control Block Record
The Address Block Record
Parameter Block for dspInit and dspCLInit
Parameter Block for dspOpen, dspCLListen, and dspCLDeny
Parameter Block for dspClose and dspRemove
Parameter Block for dspStatus
Parameter Block for dspRead and dspWrite
Parameter Block for dspAttention
Parameter Block for dspOptions
Parameter Block for dspNewCID
The DSP Parameter Block
The ASDSP Parameter Block
Assembly-Language Summary
Constants
ADSP Queue Element Equates and Sizes
Command Codes
Open Connection Modes
Connection States
Client Event Flags (Bit-Mask)
Miscellaneous Equates
ASDSP Encrypt and End-of-Message Flags and Masks
Data Structures
ADSP Connection Control Block Data Structure
DPS Parameter Block Common Fields for ADSP and ASDSP
dspInit and dspCLInit Parameter Variant
dspOptions Parameter Variant
dspOpen, dspCLListen, and dspCLDeny Parameter Variant
sdspOpen Parameter Variant
dspNewCID Parameter Variant
dspClose, dspRemove, and dspCLRemove Parameter Variant
dspStatus Parameter Variant
dspRead and dspWrite Parameter Variant
dspAttention and dspReset Parameter Variant
Result Codes

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© Apple Computer, Inc.
7 JUL 1996




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