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INTERNET-DRAFT H. Sugano

Fujitsu

F. Mazzoldi

Network Projects, Inc.

A. Diacakis

Network Projects, Inc.

S. Fujimoto

Fujitsu

G. Hudson

MIT

J. D. Ramsdell

The MITRE Corporation

Expires: September 2001 March 2001

Presence and Instant Messaging Protocol (PRIM)

<draft-mazzoldi-prim-impp-01.txt>

Status of this Memo

This document is an Internet-Draft and is in full conformance with

all provisions of Section 10 of RFC2026.

Internet-Drafts are working documents of the Internet Engineering

Task Force (IETF), its areas, and its working groups. Note that

other groups may also distribute working documents as Internet-

Drafts.

Internet-Drafts are draft documents valid for a maximum of six months

and may be updated, replaced, or obsoleted by other documents at any

time. It is inappropriate to use Internet- Drafts as reference

material or to cite them other than as "work in progress."

The list of current Internet-Drafts can be accessed at

http://www.ietf.org/ietf/1id-abstracts.txt

The list of Internet-Draft Shadow Directories can be accessed at

http://www.ietf.org/shadow.html.

Please send comments to the authors or to the prim@ml.fujitsulabs.com

discussion list.

Mazzoldi et al. [Page 1]

INTERNET DRAFT PRIM Specification March 2001

Table of Contents

1. Introduction ......................................... 5

1.1. Design Goals and Assumptions ......................... 5

2. Terminology .......................................... 6

3. Architecture ......................................... 6

3.1. Service Domain Clustering ............................ 7

4. Connection Model ..................................... 7

4.1. Client-server Connections ............................ 7

4.2. Server-server Connections ............................ 7

4.3. Shared Connections for Both Services ................. 8

5. Presence Model ....................................... 8

5.1. Presence Subscriptions ............................... 9

5.2. PRESENCE Publication & Distribution .................. 9

6. Instant Messaging Model .............................. 9

7. Namespace ............................................ 10

7.1. Identifiers .......................................... 10

7.2. Name Resolution ...................................... 11

8. Command Structure .................................... 12

8.1. Requests ............................................. 13

8.2. Responses ............................................ 14

9. Command Headers ...................................... 15

9.1. Common Headers ....................................... 16

9.2. Presence Headers ..................................... 20

9.3. IM Headers ........................................... 21

10. Common Commands ..................................... 21

10.1. Connection Setup - LOGIN ............................ 21

10.2. Connection Setup - STARTTLS ......................... 23

10.3. Connection Shutdown - LOGOUT ........................ 23

10.4. Testing a connection - PING ......................... 23

10.5. Verifying a server’s authority - VERIFYSERVER ....... 24

10.6. Access Control ...................................... 24

11. Presence Service Commands ........................... 26

11.1. Placement, Renewal and Removal of SUBSCRIPTIONS ..... 26

11.2. Publication & Removal of PRESENCE INFORMATION ....... 29

11.3. Propagation of PRESENCE INFORMATION - NOTIFY ........ 32

11.4. Presence Privacy Management ......................... 33

12. Instant Messaging Service Commands .................. 36

12.1. Listening to INSTANT INBOXes ........................ 36

12.2. Sending Messages - SEND ............................. 37

12.3. Access Control Lists ................................ 38

13. Authentication ...................................... 38

13.1. Client-Server Authentication ........................ 39

13.2. Server-Server Authentication ........................ 41

14. Privacy Management .................................. 42

14.1. Presence Publication Control ........................ 42

14.2. Access Control ...................................... 43

15. Presence Information Data Format (PIDF) ............. 46

Mazzoldi et al. [Page 3]

INTERNET DRAFT PRIM Specification March 2001

1. Introduction

On the Internet and elsewhere, a growing number of people would like

to know when others are available to communicate with them. A system

that provides this type of PRESENCE INFORMATION is known as Presence

Service.

INSTANT MESSAGING allows text base communication to occur in a rapid,

conversational fashion. An INSTANT MESSAGE is delivered to a

recipient if the recipient is listening for messages, otherwise the

message is dropped and the sender is informed of the delivery

failure.

PRESENCE and INSTANT MESSAGING SERVICES are separate and can work

independently of each other. However, by utilizing the Presence

Service a user has a better idea as to whether a recipient is

listening for INSTANT MESSAGES. Therefore, the two services are often

used in tandem.

The PResence and Instant Messaging (PRIM) protocol is designed so

that INSTANT MESSAGING and PRESENCE SERVICES can be provided by a set

of servers distributed across a large number of administrative

domains.

PRIM is also designed to conform to the Common Profile for Instant

Messaging (CPIM) specification being developed by the IMPP WG. This

enables that users of PRIM services exchange PRESENCE INFORMATION and

INSTANT MESSAGES with the users of the services which use other CPIM

compatible protocols.

1.1. Design Goals and Assumptions

Some of the design principles on which this protocol is based are:

o Transfer protocol directly atop of TCP

PRIM assumes TCP as the basic transport mechanism for INSTANT

MESSAGES and PRESENCE INFORMATION. TCP provides a sufficiently

reliable transport infrastructure which is required by both INSTANT

MESSAGING and PRESENCE SERVICES.

o Long-lived Client/Server connections

PRIM uses long-lived client/server TCP connections in order to

receive INSTANT MESSAGES and PRESENCE INFORMATION NOTIFICATIONS.

Note that this is the prevailing model used by most Presence and IM

systems today. It brings the following advantages:

Mazzoldi et al. [Page 5]

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June_Hou

2016-11-01

全英文的..
myspore

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很好，写得比较全面
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读起来比较费力
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对于论文的摘要以及绪论的写作有很大的用处。
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全英文的，读起来比较吃力

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