Protocol-A.texi 287 KB
Newer Older
David Byers's avatar
David Byers committed
1
\input texinfo                         @c -*-texinfo-*-
David Byers's avatar
David Byers committed
2
3
@c
@c FIXME: Explain how the garb works with nice and keep-commented
Per Cederqvist's avatar
Per Cederqvist committed
4
5
6
7
8
9
@c FIXME: @i{Example:} is only used in front of some examples.
@c FIXME: @} in examples sometimes lack a leading space.
@c FIXME: Is there any ``Upright text in a reply''?
@c FIXME: @ref, @xref and @pxref are used wrongly.
@c FIXME: Make all types clickable in HTML (and info?)
@c FIXME: Check for @ifinfo that should be @ifnottex.
David Byers's avatar
David Byers committed
10
@c
Per Cederqvist's avatar
Per Cederqvist committed
11
@c $Id: Protocol-A.texi,v 1.112 2001/04/19 08:22:06 ceder Exp $
David Byers's avatar
David Byers committed
12
13
14
15
@c %**start of header
@setfilename protocol-a.info
@settitle LysKOM Protocol A
@setchapternewpage odd
16
@c @afourpaper
David Byers's avatar
David Byers committed
17
@c %**end of header
18
19
20
21

@set PROTOEDITION 10.4
@set PROTOVER 10
@set VERSION 1.0.4
David Byers's avatar
David Byers committed
22

23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
@c @req{login} is used for protocol requests.
@macro req {n}
@code{\n\}
@end macro

@c @aux{mx-allow-filter} is used for aux-item names.
@macro aux {n}
@code{\n\}
@end macro

@c @async{async-login} is used for async names.
@macro async {n}
@code{\n\}
@end macro

@c @type{Conference} is used for LysKOM types.
@macro type {n}
@code{\n\}
@end macro

@c @priv{wheel} is used for privilege bits.
@macro priv {n}
@code{\n\}
@end macro

@c @conftype{rd-prot} is used for conference type bits.
@macro conftype {n}
@code{\n\}
@end macro

@c @misc{bcc-recpt} is used for misc-info names.
@macro misc {n}
@code{\n\}
@end macro

@c @rarg{passwd} is used to reference arguments of requests.  This is
@c *only* used in the nodes that defines the requests.
@macro rarg {n}
@code{\n\}
@end macro

@c @aarg{text-no} is used to reference arguments of asynchronous
@c messages.  This is *only* used in the nodes that defines the
@c relevant asynchronous message.
@macro aarg {n}
@code{\n\}
@end macro

@c @errorcode{no-such-text} is used to mark error codes.
@macro errorcode {n}
@code{\n\}
@end macro

@c @field{ident-user} is used to mark fields of struct types.
@macro field {n}
@code{\n\}
@end macro

David Byers's avatar
David Byers committed
81
@ifinfo
82
83
84
This is the LysKOM Protocol A specification, edition
@value{PROTOEDITION}.  It specifies version @value{PROTOVER} of the
protocol.  It corresponds to version @value{VERSION} of lyskomd.
David Byers's avatar
David Byers committed
85

Per Cederqvist's avatar
Per Cederqvist committed
86
Copyright @copyright{} 1995-2000 Lysator ACS.
David Byers's avatar
David Byers committed
87
88
89
90

Permission is granted to make and distribute verbatim copies of this
specification provided the copyright notice and this permission notice
are preserved on all copies.
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106

@ignore
Permission is granted to process this file through TeX
and print the results, provided the printed document
carries a copying permission notice identical to this
one except for the removal of this paragraph (this
paragraph not being relevant to the printed manual).
@end ignore

Modified versions of this document may be redistributed with the added
condition that all modifications not cleared with the LysKOM development group
are clearly marked and that the entire modified work be redistributed under the
same conditions as the original.

Permission is granted to copy and distribute translations of this manual into
another language under the same conditions as for modified versions.
David Byers's avatar
David Byers committed
107
108
@end ifinfo

109
110
111
112
113
114
115
116
117
118
@c FIXME: What does this do?
@iftex
@parindent 0pt
@font@tensltt=cmsltt10
@begin tex
\global\def\rett#1{{\let\t\sltt\tt #1}}
\global\def\sltt#1{{\fam\ttfam\tensltt\let\t\rett #1}}
\global\let\t\sltt
@end tex
@end iftex
119

David Byers's avatar
David Byers committed
120
121
@titlepage
@title{LysKOM Protocol A}
122
123
124
@subtitle{Protocol version @value{PROTOVER}}
@subtitle{Edition @value{PROTOEDITION}}
@subtitle{(lyskomd @value{VERSION})}
David Byers's avatar
David Byers committed
125
126
127
128
@author by the LysKOM Developers

@page
@vskip 0pt plus 1filll
Per Cederqvist's avatar
Per Cederqvist committed
129
Copyright @copyright{} 1995-2000 Lysator ACS
David Byers's avatar
David Byers committed
130
131
132
133
134
135
136
137
138
139
140
141
142
143

Permission is granted to make and distribute verbatim copies of this document
provided the copyright notice and this permission notice are preserved on all
copies.

Modified versions of this document may be redistributed with the added
condition that all modifications not cleared with the LysKOM development group
are clearly marked and that the entire modified work be redistributed under the
same conditions as the original.

Permission is granted to copy and distribute translations of this manual into
another language under the same conditions as for modified versions.

@end titlepage
144
145
146
@ifnothtml
@contents
@end ifnothtml
David Byers's avatar
David Byers committed
147

148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
@dircategory LysKOM
@direntry
* Protocol A: (protocol-a).             The LysKOM Protocol A specification.
@end direntry

@ifhtml
@html
<a href="http://www.lysator.liu.se/" ><img
src="http://www.lysator.liu.se/icons/lyslogo.gif" alt="Lysator"
width=40 border=0 height=40 align=left ></a>

<a href="http://www.lysator.liu.se/lyskom/" ><img
src="http://www.lysator.liu.se/icons/lyskom.gif" alt="LysKOM" width=40
border=0 height=40 align=left ></a>
<br clear=all>
@end html
@end ifhtml
@ifnottex
166
@node Top
167
@top LysKOM Protocol A
168

169
170
171
172
173
174
175
This document specifies version @value{PROTOVER} of LysKOM Protocol A.
This is edition @value{PROTOEDITION} of the specification.  It
corresponds to version @value{VERSION} of lyskomd.

The most up-to-date version if this document can always be found at 
@uref{http://www.lysator.liu.se/lyskom/protocol/}.
@end ifnottex
David Byers's avatar
David Byers committed
176
177

@menu
178
179
180
181
182
183
184
185
186
187
188
189
* Overview::                    
* Introduction::                
* Data Types::                  
* Protocol Requests::           
* Asynchronous Messages::       
* Error Codes::                 
* LysKOM Content Types::        
* The User Area::               
* Writing Clients::             
* Importing and Exporting E-Mail::  
* Type Index::                  
* Request Index::               
David Byers's avatar
David Byers committed
190
191
@end menu

192
@node Overview
David Byers's avatar
David Byers committed
193
194
@chapter Overview

195
196
197
198
199
@iftex
This document specifies version @value{PROTOVER} of LysKOM Protocol A.
This is edition @value{PROTOEDITION} of the specification.  It
corresponds to version @value{VERSION} of lyskomd.

200
201
The most up-to-date version if this document can always be found on
the web at @uref{http://www.lysator.liu.se/lyskom/protocol/}.
202
203
@end iftex

David Byers's avatar
David Byers committed
204
LysKOM is a conferencing system@footnote{Or in modern terms, enabling
205
206
207
208
209
210
technology for Computer-Supported Cooperative Work (CSCW).}. Similar
systems were QZ-KOM and PortaCOM@footnote{Also known as ``PottaKOM'' and
``BortaKOM.''}. The LysKOM system is copyrighted by Lysator Academic
Computing Society and distributed under conditions of the GNU Public
License. LysKOM and its documentation is provided ``as is'' without
warranty of any kind.
David Byers's avatar
David Byers committed
211

212
213
Anything described here as ``unspecified'' is liable to change in
future protocol versions.
David Byers's avatar
David Byers committed
214
215

This specification is the work of several people. The main contributors have
216
been
David Byers's avatar
David Byers committed
217
218
Per Cederqvist @email{ceder@@lysator.liu.se}, 
David Byers @email{byers@@lysator.liu.se},
David Byers's avatar
David Byers committed
219
220
221
222
223
224
@ifinfo
Pär
@end ifinfo
@iftex
P@"ar
@end iftex
David Byers's avatar
David Byers committed
225
226
227
228
Emanuelsson @email{pell@@lysator.liu.se},
Thomas Bellman @email{bellman@@lysator.liu.se}, 
Lars Aronsson @email{aronsson@@lysator.liu.se},
Linus Tolke @email{linus@@lysator.liu.se} and
David Byers's avatar
David Byers committed
229
230
231
232
233
234
@ifinfo
Kent Engström
@end ifinfo
@iftex
Kent Eng@-str@"om@penalty-10000
@end iftex
David Byers's avatar
David Byers committed
235
@email{kent@@lysator.liu.se}.
David Byers's avatar
David Byers committed
236

David Byers's avatar
David Byers committed
237
238
The LysKOM developers can be reached by email to
@email{lyskom@@lysator.liu.se}.
David Byers's avatar
David Byers committed
239

240
@menu
241
* Document Edition History::   
242
243
* Protocol Version History::    
* Notation::                    
David Byers's avatar
David Byers committed
244
245
@end menu

246
247
@node Document Edition History
@section Document Edition History
David Byers's avatar
David Byers committed
248
249

@table @asis
250

251
@item 10.4: 2001-04-07
252
Editorial changes needed to publish an online version on the web at
253
254
@uref{http://www.lysator.liu.se/lyskom/protocol/}.

Per Cederqvist's avatar
Per Cederqvist committed
255
256
@item 10.3: 2000-09-09
Several aux-items can be set on letterboxes and not only conferences.  A
257
258
259
few can now be set on the server.  The @aux{allowed-content-type} and
@aux{recommended-conf} aux-items were added.  The
@aux{mx-allow-filter} and @aux{mx-reject-forward} aux-items are marked
Per Cederqvist's avatar
Per Cederqvist committed
260
261
262
obsolete.  Text regarding mail import was improved, based on actual
experience in writing an email importer.  Reserved a range of aux-items
for komimportmail.  Several minor corrections and clarifications made.
263
Distributed with lyskomd 2.0.4.
Per Cederqvist's avatar
Per Cederqvist committed
264

Per Cederqvist's avatar
Per Cederqvist committed
265
266
267
268
@item 10.2: 1999-07-23
Some typos and other minor errors were fixed.  Distributed with lyskomd
2.0.2.

269
@item 10.1: 1999-07-12
270
Call @req{sub-comment} was incorrectly marked obsolete. This has been
271
272
273
274
275
corrected. Regexps are case sensitive.  The Info-Type enumeration was
introduced in the description of the protocol.  (Previous versions of
the protocol had broken definitions of add-recipient,
async-new-recipient and async-sub-recipient.)  Distributed with lyskomd
2.0.1.
David Byers's avatar
Server:    
David Byers committed
276

277
@item 10.0: 1999-06-27
278
279
The specification was translated to English and converted to Texinfo by
David Byers.  Protocol version 10.  Distributed with lyskomd 2.0.0.
280
Note: this edition incorrectly marked the @req{sub-comment} call as
281
282
obsolete, and stated that regexp lookup was case insensitive.  Both
statements were wrong, and has since been fixed.
283
284

@item 9.0: 1996-08-04
285
Protocol version 9.  Distributed with lyskomd 1.9.0.
286

David Byers's avatar
David Byers committed
287
@item 8.0: 1995-11-10
288
Protocol version 8.  Distributed with lyskomd 1.8.0.
David Byers's avatar
David Byers committed
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312

@item 7.1: 1995-01-08.
Protocol and document revision history were added by Per Cederqvist. Outline
mode was used to make the document more manageable. This version was
distributed with lyskomd 1.7.1.

@item 7.0: 1994-12-31.
The first specification with a version number. All calls that had been added
since 1991-06-25 were documented. Pell and Per Cederqvist did the deed. This
version was distributed with lyskomd 1.7.0.

@item 1993-05-19.
Linus Tolke wrote comments for some calls that were without comments.

@item 1992-07-06.
Linus Tolke converted the document to ISO 8859-1.

@item 1991-08-12.
Per Cederqvist started using version control for documentation.

@item 1991-06-25.
Lars Aronsson documented the protocol that was in use at the time.
@end table

313
@node Protocol Version History
314
315
316
@section Protocol Version History

@subsection Protocol version 10 (first implemented in lyskomd 2.0.0)
David Byers's avatar
David Byers committed
317

318
@table @asis
319
320
321
322
323
324

@item Error codes

The error codes are now documented.  Several error codes were changed to
more sane values while documenting the new behaviour.

325
@item New Server Calls
326
327
328

These new calls have status Recommended.

329
330
331
332
333
334
335
336
337
338
339
340
341
@itemize @bullet
@item 85=get-collate-table
@item 86=create-text
@item 87=create-anonymous-text
@item 88=create-conf
@item 89=create-person
@item 90=get-text-stat
@item 91=get-conf-stat
@item 92=modify-text-info
@item 93=modify-conf-info
@item 94=get-info
@item 95=modify-system-info
@item 96=query-predefined-aux-items
342
343
344
345
@item 98=query-read-texts
@item 99=get-membership
@item 100=add-member
@item 101=get-members
346
347
348
@item 102=set-membership-type
@item 103=local-to-global
@item 104=map-created-texts
349
350
351
352
353
354
355
@item 106=set-pers-flags
@end itemize

These new calls have status Experimental.

@itemize @bullet
@item 97=set-expire
David Byers's avatar
David Byers committed
356
@item 105=set-keep-commented
357
358
@end itemize

359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
@item Name changes

@multitable {59=create-anonymous-text} {59=create-anonymous-text-old}
@item Old name                 @tab New name
@item 5=create-person          @tab 5=create-person-old
@item 9=query-read-texts       @tab 9=query-read-texts-old
@item 10=create-conf           @tab 10=create-conf-old
@item 13=get-conf-stat-old     @tab 13=get-conf-stat-older
@item 14=add-member            @tab 14=add-member-old
@item 26=get-text-stat         @tab 26=get-text-stat-old
@item 28=create-text           @tab 28=create-text-old
@item 36=get-info              @tab 36=get-info-old
@item 46=get-membership        @tab 46=get-membership-old
@item 48=get-members           @tab 48=get-members-old
@item 50=get-conf-stat         @tab 50=get-conf-stat-old
@item 59=create-anonymous-text @tab 59=create-anonymous-text-old
@end multitable

@item Status change

The following calls have change status from Experimental to Recommended.

381
@itemize @bullet
382
383
384
385
386
@item 58=get-last-text
@item 77=set-last-read
@item 78=get-uconf-stat
@end itemize

387
The following calls have changed status from Recommended or
388
389
390
391
392
393
394
395
396
Experimental to Obsolete.

@itemize @bullet
@item 5=create-person-old
@item 9=query-read-texts-old
@item 10=create-conf-old
@item 14=add-member-old
@item 26=get-text-stat-old
@item 28=create-text-old
397
@item 36=get-info-old
398
@item 46=get-membership-old
399
@item 47=get-created-texts
400
@item 48=get-members-old
401
402
@item 50=get-conf-stat-old
@item 59=create-anonymous-text-old
403
404
@end itemize

405
@item New and Modified Structures
406
@itemize @bullet
407
@item Aux-Item
408
@item Aux-Item-Input
409
410
@item Conference
@item Info
411
412
413
@item Member
@item Membership
@item Membership-Type
414
415
@item Misc-Info
@item Text-Stat
416
417
@end itemize

418
419
420
421
422
423
@item Renamed Asynchronous Messages
A @samp{async-} prefix has been added to the name of all asynchronous
messages.  In addition, 0=new-text has been renamed to
0=async-new-text-old, and it is now considered obsolete.  Clients should
use 80=accept-async to listen to 15=async-new-text instead.

424
425
@item New Asynchronous Messages
@itemize @bullet
426
427
428
429
430
@item 14=async-deleted-text
@item 15=async-new-text
@item 16=async-new-recipient
@item 17=async-sub-recipient
@item 18=async-new-membership
431
@end itemize
432
433
434

@item Notes
@itemize @bullet
435
@item Since protocol version 9 setting a priority of zero for a
436
437
438
conference was supposed to indicate passive membership in a conference. 
It was largely up to the client to implement this. True passive
memberships have been introduced in this protocol version through the
439
Membership-type extension to the Membership type. In order to maintain
440
441
442
443
444
compatibility with clients that interpret priority 0 as passive
membership, the old calls @pxref{add-member-old} and
@pxref{get-membership-old} perform magic, translating between priorities 
and membership types. The magic is documented with each call.
@end itemize
445
446
@end table

447

448
@subsection Protocol version 9 (first implemented in lyskomd 1.9.0)
449
450

@table @asis
451
452
@item New functionality
@itemize @bullet
453
@item The server shall now reply with error @errorcode{not-implemented} when
454
455
456
a client attempts to use an unimplemented call.  This feature requires
that the client uses newline as call terminator.
@end itemize
Per Cederqvist's avatar
Per Cederqvist committed
457
@item Added Commands
458
@itemize @bullet
459
460
461
462
463
464
@item 79=set-info: Can change server information.
@item 80=accept-async: Can select asynchronous messages to receive.
@item 81=query-async: Can query which messages are being send.
@item 82=user-active
@item 83=who-is-on-dynamic
@item 84=get-static-session-info
465
@end itemize
466
467
@item Changed names
@itemize @bullet
468
@item @req{change-conference} was previously called @code{pepsi}.  The
469
470
471
472
name was changed, but not the functionality.
@end itemize
@item Status change
@itemize @bullet
473
474
@item 63=@req{who-is-on-ident} is now considered obsolete.
@item 64=@req{get-session-info-ident} is now considered obsolete.
475
@end itemize
476
477
@end table

478
@subsection Protocol version 8 (first implemented in lyskomd 1.8.0)
David Byers's avatar
David Byers committed
479

480
@table @asis
David Byers's avatar
David Byers committed
481
482
483
@item Added Functionality
@itemize @bullet
@item
484
30=add-recipient: Can change @misc{recpt} to @misc{cc-recpt} and vice versa.
David Byers's avatar
David Byers committed
485
@item
486
21=set-conf-type: Accepts @type{Conf-Type} and @type{Extended-Conf-Type}.
David Byers's avatar
David Byers committed
487
@item
488
10=create-conf: Accepts @type{Conf-Type} and @type{Extended-Conf-Type}.
David Byers's avatar
David Byers committed
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
@end itemize

@item New Commands
@itemize @bullet
@item
77=set-last-read
@item
78=get-uconf-stat
@end itemize
@end table

@subsection Protocol version 7 (first implemented in lyskomd 1.7.0)

@table @asis
@item Added Functionality
@itemize @bullet
@item
53=send-message: Recipient can be a conference or a person.
@end itemize

@item New Commands
@itemize @bullet
@item
74=re-z-lookup
@item
514
75=get-version-info
David Byers's avatar
David Byers committed
515
@item
516
76=lookup-z-name
David Byers's avatar
David Byers committed
517
518
519
520
521
@end itemize

@item Other
@itemize @bullet
@item
Per Cederqvist's avatar
Per Cederqvist committed
522
The asynchronous message 1=i-am-off has been removed
David Byers's avatar
David Byers committed
523
524
525
526
527
528
529
530
531
@end itemize
@end table

@subsection Protocol Version 6 (first implemented in lyskomd 1.4.0)

@table @asis
@item New Calls
@itemize @bullet
@item
532
67=lookup-person
David Byers's avatar
David Byers committed
533
@item
534
68=lookup-conf
David Byers's avatar
David Byers committed
535
@item
536
69=set-client-version
David Byers's avatar
David Byers committed
537
@item
538
70=get-client-name
David Byers's avatar
David Byers committed
539
@item
540
71=get-client-version
David Byers's avatar
David Byers committed
541
@item
542
72=mark-text
David Byers's avatar
David Byers committed
543
@item
544
73=unmark-text
David Byers's avatar
David Byers committed
545
546
547
548
549
550
551
552
553
554
@end itemize
@end table


@subsection Protocol Version 5 (first implemented in lyskomd 1.3.0)

@table @asis
@item New Calls
@itemize @bullet
@item
555
65=re-lookup-person
David Byers's avatar
David Byers committed
556
@item
557
66=re-lookup-conf
David Byers's avatar
David Byers committed
558
559
560
561
562
563
564
565
566
567
568
@end itemize
@end table

@subsection Protocol Version 4 (first implemented in lyskomd 1.1.1)

@table @asis
@item New Calls
@itemize @bullet
@item
62=login
@item
569
63=who-is-on-ident
David Byers's avatar
David Byers committed
570
@item
571
64=get-session-info-ident
David Byers's avatar
David Byers committed
572
573
574
575
576
577
578
579
580
@end itemize
@end table

@subsection Protocol Version 3 (first implemented in lyskomd 1.1.0)

@table @asis
@item New Calls
@itemize @bullet
@item
581
61=find-previous-text-no
David Byers's avatar
David Byers committed
582
@item
583
60=find-next-text-no
David Byers's avatar
David Byers committed
584
@item
585
59=create-anonymous-text
David Byers's avatar
David Byers committed
586
@item
587
58=get-last-text
David Byers's avatar
David Byers committed
588
589
590
591
592
593
594
595
596
@end itemize
@end table

@subsection Protocol Version 2 (first implemented in lyskomd 0.30.0)

@table @asis
@item New Calls
@itemize @bullet
@item
597
57=set-user-area
David Byers's avatar
David Byers committed
598
599
600
601
602
603
604
605
606
607
608
@end itemize
@end table

@subsection Protocol Version 1 (first implemented in lyskomd 0.29.2)

@table @asis
@item New Calls
All calls from 0--56.
@end table


609
@node Notation
David Byers's avatar
David Byers committed
610
611
@section Notation

612
This specification uses a BNF-like grammar to describe the protocol and
613
its data elements.
David Byers's avatar
David Byers committed
614

615
Data fields have been given names that start with a lower-case letter.
616

617
618
Fundamental data types have names in all-caps (such as @type{INT32} and
@type{ARRAY}).
619
620
621

Derived data types have names that start with an upper-case letter. (If
the type contains more than one word, all words start with an upper-case
622
letter, like this: @type{Text-Stat}.)  The operator @code{::=} defines
623
624
625
626
the name to its left.

Comments start with @code{!} (exclamation mark) and alternatives are
separated by a @code{|} (vertical bar.) A @code{;} (semicolon)
627
628
629
terminates statements in the grammar. In some specifications there are
literal strings. There is to be no whitespace before or after literal
strings unless there is whitespace in the literal itself.
David Byers's avatar
David Byers committed
630
631


632
@node Introduction
David Byers's avatar
David Byers committed
633
634
635
636
637
638
@chapter Introduction

This chapter introduces the concepts used in LysKOM, such as articles,
conferences and sessions. 

@menu
639
640
641
642
643
644
645
* Articles::                    
* Conferences::                 
* The Misc-Info List::          
* The Aux-Item List::           
* Security::                    
* Membership and Reading::      
* Client-Server Dialog::        
David Byers's avatar
David Byers committed
646
647
648
@end menu


649
@node Articles
David Byers's avatar
David Byers committed
650
651
@section Articles

652
An article is represented as a value of the type @type{Text-Stat} and a
David Byers's avatar
David Byers committed
653
string containing the article contents. An article will usually have one
654
655
or more recipients and may be a comment or footnote to other articles.
Each article is kept in the database until it is older than the
656
@field{nice} value of each of its recipients and it is not marked by any
657
user.
David Byers's avatar
David Byers committed
658

659
660
661
662
663
Currently there is an array of @type{Misc-Info} included in the
@type{Text-Stat}. This array contains information about recipients,
senders, comments and footnotes. In the future the information
contained in the @type{Misc-Info} array will be integrated into the
@type{Text-Stat}.
David Byers's avatar
David Byers committed
664
665
666

Every article has at least one number, the global article number. Global
numbers are assigned in ascending order to new articles, and are never
667
reused. If an article has recipients it will also have a local number
Per Cederqvist's avatar
Per Cederqvist committed
668
for each recipient. Local numbers are used in some data structures to
669
provide more compact storage and to provide an ordering of articles for
670
671
672
a particular recipient. Local numbers are assigned in ascending order
and are never reused for a particular recipient, though different
recipients will have articles with the same local numbers.
David Byers's avatar
David Byers committed
673

674
Occasionally it is necessary to map between local and global numbers.
675
The server call @req{local-to-global} does this.
David Byers's avatar
David Byers committed
676
677
678



679
@node Conferences
David Byers's avatar
David Byers committed
680
681
@section Conferences

682
Conferences hold articles. They are represented in the protocol as a
683
684
685
data type called @type{Conference}. Each conference has a
@dfn{creator}, the person who created the conference, and a
@dfn{supervisor}, a conference whose members can modify the conference.
David Byers's avatar
David Byers committed
686
If the supervisor is a person, the members of that person's mailbox
687
are supervisors, which in most cases is only that person. We have also
688
introduced a type called @type{UConference} (pronounced micro-conf-stat)
689
which holds a subset of the information contained in the full
690
@type{Conference} type. Use the @type{UConference} type whenever
691
possible since it places a much smaller load on the LysKOM server.
David Byers's avatar
David Byers committed
692

693
694
695
696
Each conference has a type, which is essentially a collection of
boolean flags. Currently the flags @conftype{rd-prot},
@conftype{letterbox}, @conftype{secret}, @conftype{original},
@conftype{allow-anonymous} and @conftype{forbid-secret} are defined.
David Byers's avatar
David Byers committed
697

698
@table @conftype
David Byers's avatar
David Byers committed
699
700
701
702
703
@item rd-prot
The conference is protected from reading by non-members. Persons become
members by having one of the existing members or supervisors add him or
her to the conference. This restriction is enforced by the server.
@item original
704
705
706
707
Conferences of this type are intended for original articles only.
Comments are to be redirected to the super-conference instead. This
restriction is currently not enforced by the server; clients must
implement this functionality.
David Byers's avatar
David Byers committed
708
@item letterbox
709
Conferences of this type are connected to persons. Letters to a person
David Byers's avatar
David Byers committed
710
are sent to the mailbox and the name of the mailbox is synchronized
711
712
with the person name. It is currently not possible to explicitly set or
clear this flag on a conference.
David Byers's avatar
David Byers committed
713
714
@item secret
Conferences of this type are secret. The server will not divulge any
715
information about the existence of the conference to persons who are not
David Byers's avatar
David Byers committed
716
members or supervisors of the conference. If a mailbox is made secret,
David Byers's avatar
David Byers committed
717
718
that person cannot log in using the person name, but must specify a
person number instead.
719
720
721
@item allow-anonymous
Conferences of this type accept anonymous articles. Other conferences
will reject anonymous articles.
David Byers's avatar
David Byers committed
722
723
724
@item forbid-secret
Conferences of this type do not allow secret members. If a conference is 
changed to this type, preexisting secret members remain secret.
David Byers's avatar
David Byers committed
725
726
727
728
@end table



729
730
731
732
@menu
* Persons and Sessions::        
@end menu

733
@node Persons and Sessions
David Byers's avatar
David Byers committed
734
735
736
@subsection Persons and Sessions

Persons are represented in the protocol by values of the type
737
@type{Person}. Associated with persons are statistics, a set of personal
738
739
flags and a set of privileges (@pxref{Security}.) Persons are also
associated with a conference that has the same number as the person and
740
the @conftype{letterbox} bit set.
David Byers's avatar
David Byers committed
741
742

Connections to the server are represented as values of the type
743
744
@type{Static-Session-Info}, @type{Session-Info-Ident} or
@type{Session-Info}. Sessions have session number that are unique for
745
746
747
748
each session in the lifetime of the server execution. A single user can
have several sessions running at once. The session is not released until
the network connection is closed; a user can log in and out repeatedly
in a single session.
David Byers's avatar
David Byers committed
749
750


751
@node The Misc-Info List
David Byers's avatar
David Byers committed
752
753
@section The Misc-Info List

754
The @type{Misc-Info} list contains tagged data. The fields are sent in
755
groups pertaining to a particular type of information: information about
756
757
recipient; carbon copy recipient; blank carbon copy recipient;
comment to; footnote to; comment in
758
759
760
and footnote in. The information groups may be sent in any order and
there may be any number of groups. Within each group the elements are
always sent in the order listed below.
David Byers's avatar
David Byers committed
761

762
@subsection Recipient
David Byers's avatar
David Byers committed
763

764
@table @misc
David Byers's avatar
David Byers committed
765
@item recpt
766
767
Starts a recipient group. It contains the conference number of a
recipient of the article.
David Byers's avatar
David Byers committed
768
@item loc-no
769
770
Always present within a recipient group. It contains the local text
number of the article in the conference specified by the preceding
771
@misc{recpt} field.
David Byers's avatar
David Byers committed
772
@item rec-time
773
774
775
If the recipient is a person, this element is added by the server when
the recipient marks the article as read. It contains the time when the
text was read.
David Byers's avatar
David Byers committed
776
@item sent-by
777
778
779
Present when the recipient was added by a person other than the author
(after the article was created.) It contains the person number of the
person who added the recipient.
David Byers's avatar
David Byers committed
780
@item sent-at
781
782
Present when the recipient was added after the article was created. It
contains the time when the recipient was added.
David Byers's avatar
David Byers committed
783
784
785
@end table


786
@subsection Carbon Copy (CC) Recipient
David Byers's avatar
David Byers committed
787

788
789
790
791
The carbon-copy recipient group is identical to the recipient group
above. The difference is how new comments to an article with a recipient
or carbon-copy recipient are treated. A comment to an article is sent to
all recipients, but not to carbon-copy recipients of the original
Per Cederqvist's avatar
Per Cederqvist committed
792
article. This difference is enforced by the clients.
David Byers's avatar
David Byers committed
793

794
@table @misc
David Byers's avatar
David Byers committed
795
@item cc-recpt
796
797
Starts a carbon-copy recipient group. It contains the conference number
of a carbon-copy recipient of the article.
David Byers's avatar
David Byers committed
798
@item loc-no
799
800
Always present in a CC recipient group. It contains the local text
number of the article in the conference specified by the most recent
801
@misc{cc-recpt} field.
David Byers's avatar
David Byers committed
802
@item rec-time
803
Present after the CC recipient has read the article. It contains the
804
805
time when the article was read. Since only persons can read articles
this will only be seen if the CC recipient is a person.
David Byers's avatar
David Byers committed
806
807
808
@item sent-by
Present when a CC recipient was added by a person other than the author
after the article had been created. It contains the person number of the
809
person who added the CC recipient.
David Byers's avatar
David Byers committed
810
811
812
813
814
815
@item sent-at
Present when a CC recipient was added after the article had been
created. It is the time when the CC recipient was added.
@end table


816
817
818
819
820
@subsection Blank Carbon Copy (BCC) Recipient

The blank carbon-copy recipient group is identical to the carbon-copy
recipient group above. The difference is the visibility of the
information. A carbon-copy recipient group is visible to anyone that is
821
allowed to fetch both the text status of the involved text and the
822
conference status of the involved conference.  (That is, as long as the
823
conference isn't secret everybody is allowed to see the carbon-copy
824
825
recipient group.)

826
827
828
829
830
A BCC recipient group is basically only visible to members and
supervisors of the recipient.  Persons that have the right to become a
member of the recipient can also see it, as can the author of the text
(unless the recipient is secret to him).  This is enforced by the
server.
831
832

This type of group was introduced in protocol version 10.  When
833
834
835
old-style calls such as get-text-stat-old (@pxref{get-text-stat-old})
are used this will be converted to a CC recipient group by the server
for the benefit of clients that don't understand this group.
836

837
@table @misc
838
839
840
841
842
843
@item bcc-recpt
Starts a blank carbon-copy recipient group. It contains the conference
number of a blank carbon-copy recipient of the article.
@item loc-no
Always present in a BCC recipient group. It contains the local text
number of the article in the conference specified by the most recent
844
@misc{bcc-recpt} field.
845
846
847
848
849
850
851
852
853
854
855
856
857
858
@item rec-time
Present after the BCC recipient has read the article. It contains the
time when the article was read. Since only persons can read articles
this will only be seen if the BCC recipient is a person.
@item sent-by
Present when a BCC recipient was added by a person other than the author
after the article had been created. It contains the person number of the
person who added the BCC recipient.
@item sent-at
Present when a BCC recipient was added after the article had been
created. It is the time when the BCC recipient was added.
@end table


859
@subsection Comment To
David Byers's avatar
David Byers committed
860

861
@table @misc
David Byers's avatar
David Byers committed
862
863
864
865
866
867
868
869
@item comm-to
Always present when the article is a comment to another article.
@item sent-by
Present when the article was added as a comment by a person other than
the author, after the article had been created. It contains the person
number of the person who added the article as a comment.
@item sent-at
Present when the article was added as a comment after the article had
870
been created. It contains the time when it was added as a comment.
David Byers's avatar
David Byers committed
871
872
873
@end table


874
@subsection Footnote To
David Byers's avatar
David Byers committed
875

876
@table @misc
877
@item footn-to
David Byers's avatar
David Byers committed
878
879
880
Always present when the article is a footnote to another article.
@item sent-at
Present when the article was added as a footnote after the article had
881
been created. It contains the time when it was added as a footnote.
David Byers's avatar
David Byers committed
882
883
884
@end table


885
@subsection Comment in
David Byers's avatar
David Byers committed
886

887
@table @misc
David Byers's avatar
David Byers committed
888
889
890
891
892
893
@item comm-in
Present when there are comments to this article. It contains the article
number which is a comment to this article.
@end table


894
@subsection Footnote in
David Byers's avatar
David Byers committed
895

896
@table @misc
897
@item footn-in
David Byers's avatar
David Byers committed
898
899
900
901
902
Present when there are footnotes to this article. It contains the
article number which is a footnote to this article.
@end table


903
@node The Aux-Item List
904
@section The Aux-Item List
905
906
907
908
909

The aux-item list is used as a generic extension mechanism in the LysKOM
server and in protocol A. 

@menu
910
911
912
913
914
* About Aux-Items::             
* Predefined Aux-Item Types::   
* Client-Specific Aux-Item Types::  
* Experimental Aux-Item Types::  
* Defining New Aux-Item Types::  
915
916
@end menu

917
@node About Aux-Items
918
@subsection About Aux-Items
919
920
921
922

Aux-items were introduced in protocol version 10 as a mechanism for
extending the conference, text and server information structures without
changing the protocol. Persons were excluded since nobody could figure
David Byers's avatar
David Byers committed
923
out a case where setting an aux-item on the mailbox wasn't as good as
924
925
926
927
928
929
930
931
932
setting it on the person (another reason was that I was fed up writing
aux-item code by the time they were working on texts and conferences.)

The exact structure of an aux item is specified elsewhere (@pxref{LysKOM
Data Types}). The important fields here are the aux-no, tag and data
fields.

The aux-no field is used to identify an item. The aux-no together with a
text or conference number uniquely identifies a particular aux item.
933
Items are numbered from one and up within each item list. Once assigned,
934
935
936
937
the aux-no for an item is never changed. New items are guaranteed to
be assigned numbers that have never been used before within a particular
list.

938
The tag field identifies the type of aux item. It is used by the server
939
940
941
942
943
944
945
946
947
948
and by clients to figure out how to interpret the data field, and by the
server to decide if the item needs special treatment.

The data field is a simple string. The meaning of the string is
determined by the tag field, but since it is a string, clients that have
no understanding of the contents can successfully parse the item anyway
(in contrast to items in the misc-info list.)



949
@node Predefined Aux-Item Types
950
@subsection Predefined Aux-Item Types
951

David Byers's avatar
David Byers committed
952
953
954
Predefined Aux-Item types are part of Protocol A, and clients should
support all of them. As with other parts of the protocol, changes to
these definitions will be made backwards-compatible, if possible.
955

David Byers's avatar
David Byers committed
956
957
958
Creation and deletion of items with a predefined type can cause
arbitrarily complex and wonderous behavior in the server. Furthermore,
the server may place constraints on the items with regard to content,
959
flags, who can create them, to what objects they can be attached and
David Byers's avatar
David Byers committed
960
961
so forth. The server may also silently enforce specific values for any
field of an item, regardless of what the client requests.
962

963
All items with tags in the range 1-9999 and 30000 and up are considered
964
965
predefined. If a client attempts to create an item with a tag in this
range, but the server has no idea what that tag means, the server will
David Byers's avatar
David Byers committed
966
return an error (illegal-aux-item.)
967

968
969
Some of the aux-items below (mostly the ones that begin with "mx-") are
used by mail importers. For information about supplementary aux-items
970
introduced by @command{komimportmail}, see @ref{komimportmail Aux-Item Types}.
971
972
973

@table @samp
@item content-type [1] (text)
974
Specifies the content type of a text. Data is a valid MIME type or one
975
976
977
978
979
980
981
982
983
984
985
of the special LysKOM types (@pxref{LysKOM Content Types}.)

This item may only be set by the author of a text. The inherit, secret
and hide-owner bits are cleared. Only one content-type item can be
created per creator.


@item fast-reply [2] (text)
Data is a string that constitutes a brief comment to the text. This
comment should be displayed immediately after the text body. 

David Byers's avatar
David Byers committed
986
987
An item of this type will never be inherited, can always be deleted, is
never anonymous and is never secret.
988
989


990
@item cross-reference [3] (text, conference, letterbox)
David Byers's avatar
David Byers committed
991
Data is a cross-reference to something else. The contents consist of a
992
993
letter, a number, and optionally a space and a descriptive text. The
letter must be one
David Byers's avatar
David Byers committed
994
995
996
997
998
of T, C or P. T specifies that the cross-reference points to a text; C
that it points to a conference; and P that it points to a person. The
number is the id of the target of the cross reference. The descriptive
text is simly that, a text that describes the cross-reference. For
example, "T15 Check this out!" is a cross reference to text 15 with a
999
1000
description that reads "Check this out!", and "T17" is a cross reference
without a description.
For faster browsing, not all history is shown. View entire blame