-
Notifications
You must be signed in to change notification settings - Fork 0
/
sim_tmxr.c
1439 lines (1167 loc) · 56.7 KB
/
sim_tmxr.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
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
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* sim_tmxr.c: Telnet terminal multiplexor library
Copyright (c) 2001-2021, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
Based on the original DZ11 simulator by Thord Nilson, as updated by
Arthur Krewat.
31-Jan-21 JDB Added a cast in "tmxr_set_lnorder" from t_addr to uint32
26-Oct-20 JDB Line order now supports partial connection lists
23-Oct-20 JDB Added tmxr_table and tmxr_post_logs
tmxr_set_log now takes -N switch for new file
19-Dec-19 JDB Added tmxr_is_extended global hook
19-Mar-19 JDB Added tmxr_read, tmxr_write, tmxr_show, tmxr_close
global hooks and associated local hook routines;
added tmxr_init_line, tmxr_report_connection,
and tmxr_disconnect_line global routines
06-Mar-18 RMS Revised for new IP address format in sim_sock
08-Jul-17 JDB Corrected misleading indentation in tmxr_poll_tx
06-Aug-15 JDB [4.0] Added modem control functions
28-Mar-15 RMS Revised to use sim_printf
16-Jan-11 MP Made option negotiation more reliable
20-Nov-08 RMS Added three new standardized SHOW routines
30-Sep-08 JDB Reverted tmxr_find_ldsc to original implementation
27-May-08 JDB Added line connection order to tmxr_poll_conn,
added tmxr_set_lnorder and tmxr_show_lnorder
14-May-08 JDB Print device and line to which connection was made
11-Apr-07 JDB Worked around Telnet negotiation problem with QCTerm
16-Aug-05 RMS Fixed C++ declaration and cast problems
29-Jun-05 RMS Extended tmxr_dscln to support unit array devices
Fixed bug in SET LOG/NOLOG
04-Jan-04 RMS Changed TMXR ldsc to be pointer to linedesc array
Added tmxr_linemsg, circular output pointers, logging
(from Mark Pizzolato)
29-Dec-03 RMS Added output stall support
01-Nov-03 RMS Cleaned up attach routine
09-Mar-03 RMS Fixed bug in SHOW CONN
22-Dec-02 RMS Fixed bugs in IAC+IAC receive and transmit sequences
Added support for received break (all from by Mark Pizzolato)
Fixed bug in attach
31-Oct-02 RMS Fixed bug in 8b (binary) support
22-Aug-02 RMS Added tmxr_open_master, tmxr_close_master
30-Dec-01 RMS Added tmxr_fstats, tmxr_dscln, renamed tmxr_fstatus
03-Dec-01 RMS Changed tmxr_fconns for extended SET/SHOW
20-Oct-01 RMS Fixed bugs in read logic (found by Thord Nilson).
Added tmxr_rqln, tmxr_tqln
This library includes:
tmxr_poll_conn - poll for connection
tmxr_reset_ln - reset line
tmxr_getc_ln - get character for line
tmxr_poll_rx - poll receive
tmxr_putc_ln - put character for line
tmxr_poll_tx - poll transmit
tmxr_set_modem_control_passthru - enable modem control on a multiplexer
tmxr_set_get_modem_bits - set and/or get a line modem bits
tmxr_open_master - open master connection
tmxr_close_master - close master connection
tmxr_attach - attach terminal multiplexor
tmxr_detach - detach terminal multiplexor
tmxr_ex - (null) examine
tmxr_dep - (null) deposit
tmxr_msg - send message to socket
tmxr_linemsg - send message to line
tmxr_fconns - output line connection status
tmxr_fstats - output line connection statistics
tmxr_set_log - open a log file for a terminal line
tmxr_set_nolog - close a log file for a terminal line
tmxr_post_logs - flush and optionally close all log files
tmxr_show_log - output log file status
tmxr_dscln - disconnect line (SET routine)
tmxr_rqln - number of available characters for line
tmxr_tqln - number of buffered characters for line
tmxr_set_lnorder - set line connection order
tmxr_show_lnorder - show line connection order
tmxr_show_summ - output the number of connections
tmxr_show_cstat - output device connection status or statistics
tmxr_show_lines - output the number of lines
tmxr_find_ldsc - find a line descriptor
tmxr_send_buffered_data - write the line data
tmxr_init_line - initialize the line data
tmxr_report_connection - report a line connection to the port
tmxr_disconnect_line - disconnect a line
All routines are OS-independent.
*/
#include "sim_defs.h"
#include "sim_sock.h"
#include "sim_tmxr.h"
#include "scp.h"
#include <ctype.h>
/* Telnet protocol constants - negatives are for init'ing signed char data */
/* Commands */
#define TN_IAC -1 /* protocol delim */
#define TN_DONT -2 /* dont */
#define TN_DO -3 /* do */
#define TN_WONT -4 /* wont */
#define TN_WILL -5 /* will */
#define TN_SB -6 /* sub-option negotiation */
#define TN_GA -7 /* go ahead */
#define TN_EL -8 /* erase line */
#define TN_EC -9 /* erase character */
#define TN_AYT -10 /* are you there */
#define TN_AO -11 /* abort output */
#define TN_IP -12 /* interrupt process */
#define TN_BRK -13 /* break */
#define TN_DATAMK -14 /* data mark */
#define TN_NOP -15 /* no operation */
#define TN_SE -16 /* end sub-option negot */
/* Options */
#define TN_BIN 0 /* bin */
#define TN_ECHO 1 /* echo */
#define TN_SGA 3 /* sga */
#define TN_LINE 34 /* line mode */
#define TN_CR 015 /* carriage return */
#define TN_LF 012 /* line feed */
#define TN_NUL 000 /* null */
/* Telnet line states */
#define TNS_NORM 000 /* normal */
#define TNS_IAC 001 /* IAC seen */
#define TNS_WILL 002 /* WILL seen */
#define TNS_WONT 003 /* WONT seen */
#define TNS_SKIP 004 /* skip next cmd */
#define TNS_CRPAD 005 /* CR padding */
#define TNS_DO 006 /* DO request pending rejection */
/* Multiplexer-descriptor table.
Each device multiplexer declares a multiplexer descriptor (TMXR) structure to
identify the mux and its terminal lines. The structure is local to the
device simulator, and nothing in the DEVICE structure points to it, so there
is no external way of accessing the line (TMLN) structures. Access is needed
if the associated terminal line logs are to be flushed when a simulator stop
occurs and closed when the simulator exits. This is provided by a global
table of TMXR structures that is filled in when line logs are opened.
*/
#define TABLE_COUNT 10 /* the number of table entries provided */
static TMXR *tmxr_table [TABLE_COUNT] = { NULL }; /* the table of multiplexer descriptors */
void tmxr_rmvrc (TMLN *lp, int32 p);
extern char sim_name[];
extern uint32 sim_os_msec (void);
static int32 tmxr_local_read (TMLN *lp, int32 length);
static int32 tmxr_local_write (TMLN *lp, int32 length);
static void tmxr_local_show (TMLN *lp, FILE *stream);
static void tmxr_local_close (TMLN *lp);
int32 (*tmxr_read) (TMLN *lp, int32 length) = tmxr_local_read;
int32 (*tmxr_write) (TMLN *lp, int32 length) = tmxr_local_write;
void (*tmxr_show) (TMLN *lp, FILE *stream) = tmxr_local_show;
void (*tmxr_close) (TMLN *lp) = tmxr_local_close;
t_bool (*tmxr_is_extended) (TMLN *lp) = NULL;
/* Poll for new connection
Called from unit service routine to test for new connection
Inputs:
*mp = pointer to terminal multiplexor descriptor
Outputs:
line number activated, -1 if none
If a connection order is defined for the descriptor, and the first value is
not < 0 to indicate the default order, then the order array is used to find
an open line. Otherwise, a search is made of all lines in numerical
sequence.
If some valid lines are to be omitted from the connection order, a value < 0
will appear after the last allowed line value. For example, specifying
connection order values of 1, 0, 2, and -1 will allow connections to lines 1,
0, and 2 in that order. Additional connection attempts will fail with "All
connections busy," even though more lines are available in the device.
*/
int32 tmxr_poll_conn (TMXR *mp)
{
SOCKET newsock;
TMLN *lp;
int32 *op, *fop;
int32 i, j;
char *ipaddr = NULL;
static char mantra[] = {
TN_IAC, TN_WILL, TN_LINE,
TN_IAC, TN_WILL, TN_SGA,
TN_IAC, TN_WILL, TN_ECHO,
TN_IAC, TN_WILL, TN_BIN,
TN_IAC, TN_DO, TN_BIN
};
newsock = sim_accept_conn (mp->master, &ipaddr); /* poll connect */
if (newsock != INVALID_SOCKET) { /* got a live one? */
fop = op = mp->lnorder; /* get line connection order list pointer */
i = mp->lines; /* play it safe in case lines == 0 */
for (j = 0; j < mp->lines; j++, i++) { /* find the next available line */
if (fop == NULL || *fop < 0) /* if the first list entry is undefined or defaulted */
i = j; /* then use the next sequential line */
else if (*op >= 0 && *op < mp->lines) /* otherwise if the line number is legal */
i = *op++; /* then use the next listed line */
else { /* otherwise the list entry is invalid */
i = mp->lines; /* so abandon the search now */
break; /* and report that no lines are free */
}
lp = mp->ldsc + i; /* get pointer to line descriptor */
if (lp->conn == 0) /* is the line available? */
break; /* yes, so stop search */
}
if (i >= mp->lines) { /* all busy? */
tmxr_msg (newsock, "All connections busy\r\n");
sim_close_sock (newsock);
}
else {
lp = mp->ldsc + i; /* get line desc */
lp->conn = newsock; /* record connection */
lp->ipad = ipaddr; /* ip address */
lp->cnms = sim_os_msec (); /* time of conn */
tmxr_init_line (lp); /* initialize the line */
sim_write_sock (newsock, mantra, sizeof (mantra));
tmxr_report_connection (mp, lp, i); /* report the connection */
return i;
}
} /* end if newsock */
return -1;
}
/* Reset line */
void tmxr_reset_ln (TMLN *lp)
{
if (lp->txlog) /* dump log */
fflush (lp->txlog);
tmxr_send_buffered_data (lp); /* send buffered data */
free (lp->ipad);
lp->ipad = NULL;
tmxr_close (lp); /* reset the connection */
tmxr_init_line (lp); /* initialize the line */
lp->conn = 0; /* and clear the connection */
return;
}
/* Enable modem control pass thru
Inputs:
none
Output:
none
Implementation note:
1 Calling this API disables any actions on the part of this
library to directly manipulate DTR (&RTS) on serial ports.
2 Calling this API enables the tmxr_set_get_modem_bits and
tmxr_set_config_line APIs.
*/
static t_stat tmxr_clear_modem_control_passthru_state (TMXR *mp, t_bool state)
{
if (mp->master)
return SCPE_ALATT;
else
return SCPE_OK;
}
t_stat tmxr_set_modem_control_passthru (TMXR *mp)
{
return tmxr_clear_modem_control_passthru_state (mp, TRUE);
}
/* Manipulate the modem control bits of a specific line
Inputs:
*lp = pointer to terminal line descriptor
bits_to_set TMXR_MDM_DTR and/or TMXR_MDM_RTS as desired
bits_to_clear TMXR_MDM_DTR and/or TMXR_MDM_RTS as desired
Output:
incoming_bits if non NULL, returns the current stat of DCD,
RNG, CTS and DSR along with the current state
of DTR and RTS
Implementation note:
If a line is connected to a serial port, then these values affect
and reflect the state of the serial port. If the line is connected
to a network socket (or could be) then the network session state is
set, cleared and/or returned.
*/
t_stat tmxr_set_get_modem_bits (TMLN *lp, int32 bits_to_set, int32 bits_to_clear, int32 *incoming_bits)
{
int32 incoming_state;
if ((bits_to_set & ~(TMXR_MDM_OUTGOING)) || /* Assure only settable bits */
(bits_to_clear & ~(TMXR_MDM_OUTGOING)) ||
(bits_to_set & bits_to_clear)) /* and can't set and clear the same bits */
return SCPE_ARG;
if (lp->conn)
incoming_state = TMXR_MDM_DCD | TMXR_MDM_DSR;
else
incoming_state = 0;
if (incoming_bits)
*incoming_bits = incoming_state;
if (lp->conn && (bits_to_clear & TMXR_MDM_DTR)) { /* drop DTR? */
tmxr_linemsg (lp, "\r\nDisconnected from the ");
tmxr_linemsg (lp, sim_name);
tmxr_linemsg (lp, " simulator\r\n\n");
tmxr_reset_ln (lp);
}
return SCPE_OK;
}
/* Get character from specific line
Inputs:
*lp = pointer to terminal line descriptor
Output:
valid + char, 0 if line
*/
int32 tmxr_getc_ln (TMLN *lp)
{
int32 j, val = 0;
uint32 tmp;
if (lp->conn && lp->rcve) { /* conn & enb? */
j = lp->rxbpi - lp->rxbpr; /* # input chrs */
if (j) { /* any? */
tmp = lp->rxb[lp->rxbpr]; /* get char */
val = TMXR_VALID | (tmp & 0377); /* valid + chr */
if (lp->rbr[lp->rxbpr]) { /* break? */
lp->rbr[lp->rxbpr] = 0; /* clear status */
val = val | SCPE_BREAK;
}
lp->rxbpr = lp->rxbpr + 1; /* adv pointer */
}
} /* end if conn */
if (lp->rxbpi == lp->rxbpr) /* empty? zero ptrs */
lp->rxbpi = lp->rxbpr = 0;
return val;
}
/* Poll for input
Inputs:
*mp = pointer to terminal multiplexor descriptor
Outputs: none
*/
void tmxr_poll_rx (TMXR *mp)
{
int32 i, nbytes, j;
TMLN *lp;
for (i = 0; i < mp->lines; i++) { /* loop thru lines */
lp = mp->ldsc + i; /* get line desc */
if (!lp->conn || !lp->rcve) /* skip if !conn */
continue;
nbytes = 0;
if (lp->rxbpi == 0) /* need input? */
nbytes = tmxr_read (lp, /* yes, read */
TMXR_MAXBUF - TMXR_GUARD); /* leave spc for Telnet cruft */
else if (lp->tsta) /* in Telnet seq? */
nbytes = tmxr_read (lp, /* yes, read to end */
TMXR_MAXBUF - lp->rxbpi);
if (nbytes < 0) /* closed? reset ln */
tmxr_reset_ln (lp);
else if (nbytes > 0) { /* if data rcvd */
j = lp->rxbpi; /* start of data */
lp->rxbpi = lp->rxbpi + nbytes; /* adv pointers */
lp->rxcnt = lp->rxcnt + nbytes;
if (tmxr_is_extended != NULL /* if the line */
&& tmxr_is_extended (lp) == TRUE) /* is extended */
continue; /* then skip the Telnet processing */
memset (&lp->rbr[j], 0, nbytes); /* clear status */
/* Examine new data, remove TELNET cruft before making input available */
for (; j < lp->rxbpi; ) { /* loop thru char */
signed char tmp = lp->rxb[j]; /* get char */
switch (lp->tsta) { /* case tlnt state */
case TNS_NORM: /* normal */
if (tmp == TN_IAC) { /* IAC? */
lp->tsta = TNS_IAC; /* change state */
tmxr_rmvrc (lp, j); /* remove char */
break;
}
if ((tmp == TN_CR) && lp->dstb) /* CR, no bin */
lp->tsta = TNS_CRPAD; /* skip pad char */
j = j + 1; /* advance j */
break;
case TNS_IAC: /* IAC prev */
if (tmp == TN_IAC) { /* IAC + IAC */
lp->tsta = TNS_NORM; /* treat as normal */
j = j + 1; /* advance j */
break; /* keep IAC */
}
if (tmp == TN_BRK) { /* IAC + BRK? */
lp->tsta = TNS_NORM; /* treat as normal */
lp->rxb[j] = 0; /* char is null */
lp->rbr[j] = 1; /* flag break */
j = j + 1; /* advance j */
break;
}
switch (tmp) {
case TN_WILL: /* IAC + WILL? */
lp->tsta = TNS_WILL;
break;
case TN_WONT: /* IAC + WONT? */
lp->tsta = TNS_WONT;
break;
case TN_DO: /* IAC + DO? */
lp->tsta = TNS_DO;
break;
case TN_DONT: /* IAC + DONT? */
lp->tsta = TNS_SKIP; /* IAC + other */
break;
case TN_GA: case TN_EL: /* IAC + other 2 byte types */
case TN_EC: case TN_AYT:
case TN_AO: case TN_IP:
case TN_NOP:
lp->tsta = TNS_NORM; /* ignore */
break;
case TN_SB: /* IAC + SB sub-opt negotiation */
case TN_DATAMK: /* IAC + data mark */
case TN_SE: /* IAC + SE sub-opt end */
lp->tsta = TNS_NORM; /* ignore */
break;
}
tmxr_rmvrc (lp, j); /* remove char */
break;
case TNS_WILL: case TNS_WONT: /* IAC+WILL/WONT prev */
if (tmp == TN_BIN) { /* BIN? */
if (lp->tsta == TNS_WILL)
lp->dstb = 0;
else lp->dstb = 1;
}
tmxr_rmvrc (lp, j); /* remove it */
lp->tsta = TNS_NORM; /* next normal */
break;
/* Negotiation with the HP terminal emulator "QCTerm" is not working.
QCTerm says "WONT BIN" but sends bare CRs. RFC 854 says:
Note that "CR LF" or "CR NUL" is required in both directions
(in the default ASCII mode), to preserve the symmetry of the
NVT model. ...The protocol requires that a NUL be inserted
following a CR not followed by a LF in the data stream.
Until full negotiation is implemented, we work around the problem
by checking the character following the CR in non-BIN mode and
strip it only if it is LF or NUL. This should not affect
conforming clients.
*/
case TNS_CRPAD: /* only LF or NUL should follow CR */
lp->tsta = TNS_NORM; /* next normal */
if ((tmp == TN_LF) || /* CR + LF ? */
(tmp == TN_NUL)) /* CR + NUL? */
tmxr_rmvrc (lp, j); /* remove it */
break;
case TNS_DO: /* pending DO request */
if (tmp == TN_BIN) { /* reject all but binary mode */
char accept[] = {TN_IAC, TN_WILL, TN_BIN};
sim_write_sock (lp->conn, accept, sizeof(accept));
}
tmxr_rmvrc (lp, j); /* remove it */
lp->tsta = TNS_NORM; /* next normal */
break;
case TNS_SKIP: default: /* skip char */
tmxr_rmvrc (lp, j); /* remove char */
lp->tsta = TNS_NORM; /* next normal */
break;
} /* end case state */
} /* end for char */
} /* end else nbytes */
} /* end for lines */
for (i = 0; i < mp->lines; i++) { /* loop thru lines */
lp = mp->ldsc + i; /* get line desc */
if (lp->rxbpi == lp->rxbpr) /* if buf empty, */
lp->rxbpi = lp->rxbpr = 0; /* reset pointers */
} /* end for */
return;
}
/* Return count of available characters for line */
int32 tmxr_rqln (TMLN *lp)
{
return (lp->rxbpi - lp->rxbpr);
}
/* Remove character p (and matching status) from line l input buffer */
void tmxr_rmvrc (TMLN *lp, int32 p)
{
for ( ; p < lp->rxbpi; p++) {
lp->rxb[p] = lp->rxb[p + 1];
lp->rbr[p] = lp->rbr[p + 1];
}
lp->rbr[p] = 0; /* clear potential break from vacated slot */
lp->rxbpi = lp->rxbpi - 1;
return;
}
/* Store character in line buffer
Inputs:
*lp = pointer to line descriptor
chr = characters
Outputs:
status = ok, connection lost, or stall
*/
t_stat tmxr_putc_ln (TMLN *lp, int32 chr)
{
if (lp->txlog) /* log if available */
fputc (chr, lp->txlog);
if (lp->conn == 0) /* no conn? lost */
return SCPE_LOST;
if (tmxr_tqln (lp) < (TMXR_MAXBUF - 1)) { /* room for char (+ IAC)? */
lp->txb[lp->txbpi] = (char) chr; /* buffer char */
lp->txbpi = lp->txbpi + 1; /* adv pointer */
if (lp->txbpi >= TMXR_MAXBUF) /* wrap? */
lp->txbpi = 0;
if ((char) chr == TN_IAC) { /* IAC? */
lp->txb[lp->txbpi] = (char) chr; /* IAC + IAC */
lp->txbpi = lp->txbpi + 1; /* adv pointer */
if (lp->txbpi >= TMXR_MAXBUF) /* wrap? */
lp->txbpi = 0;
}
if (tmxr_tqln (lp) > (TMXR_MAXBUF - TMXR_GUARD)) /* near full? */
lp->xmte = 0; /* disable line */
return SCPE_OK; /* char sent */
}
lp->xmte = 0; /* no room, dsbl line */
return SCPE_STALL; /* char not sent */
}
/* Poll for output
Inputs:
*mp = pointer to terminal multiplexor descriptor
Outputs:
none
*/
void tmxr_poll_tx (TMXR *mp)
{
int32 i, nbytes;
TMLN *lp;
for (i = 0; i < mp->lines; i++) { /* loop thru lines */
lp = mp->ldsc + i; /* get line desc */
if (lp->conn == 0) /* skip if !conn */
continue;
nbytes = tmxr_send_buffered_data (lp); /* buffered bytes */
if (nbytes == 0) /* buf empty? enab line */
lp->xmte = 1;
} /* end for */
return;
}
/* Send buffered data across network
Inputs:
*lp = pointer to line descriptor
Outputs:
returns number of bytes still buffered
*/
int32 tmxr_send_buffered_data (TMLN *lp)
{
int32 nbytes, sbytes;
nbytes = tmxr_tqln(lp); /* avail bytes */
if (nbytes) { /* >0? write */
if (lp->txbpr < lp->txbpi) /* no wrap? */
sbytes = tmxr_write (lp, nbytes); /* write all data */
else
sbytes = tmxr_write (lp, TMXR_MAXBUF - lp->txbpr); /* write to end buf */
if (sbytes > 0) { /* ok? */
lp->txbpr = (lp->txbpr + sbytes); /* update remove ptr */
if (lp->txbpr >= TMXR_MAXBUF) /* wrap? */
lp->txbpr = 0;
lp->txcnt = lp->txcnt + sbytes; /* update counts */
nbytes = nbytes - sbytes;
}
if (nbytes && (lp->txbpr == 0)) { /* more data and wrap? */
sbytes = tmxr_write (lp, nbytes);
if (sbytes > 0) { /* ok */
lp->txbpr = (lp->txbpr + sbytes); /* update remove ptr */
if (lp->txbpr >= TMXR_MAXBUF) /* wrap? */
lp->txbpr = 0;
lp->txcnt = lp->txcnt + sbytes; /* update counts */
nbytes = nbytes - sbytes;
}
}
} /* end if nbytes */
return nbytes;
}
/* Return count of buffered characters for line */
int32 tmxr_tqln (TMLN *lp)
{
return (lp->txbpi - lp->txbpr + ((lp->txbpi < lp->txbpr)? TMXR_MAXBUF: 0));
}
/* Open master socket */
t_stat tmxr_open_master (TMXR *mp, char *cptr)
{
int32 i, port;
SOCKET sock;
TMLN *lp;
t_stat r;
port = (int32) get_uint (cptr, 10, 65535, &r); /* get port */
if ((r != SCPE_OK) || (port == 0))
return SCPE_ARG;
sock = sim_master_sock (cptr, &r); /* make master socket */
if (sock == INVALID_SOCKET) /* open error */
return SCPE_OPENERR;
sim_printf ("Listening on port %d (socket %d)\n", port, sock);
mp->port = port; /* save port */
mp->master = sock; /* save master socket */
for (i = 0; i < mp->lines; i++) { /* initialize lines */
lp = mp->ldsc + i;
if (tmxr_is_extended == NULL /* if the line */
|| tmxr_is_extended (lp) == FALSE) { /* is not extended */
tmxr_init_line (lp); /* then initialize the line */
lp->conn = 0; /* and clear the connection */
}
}
return SCPE_OK;
}
/* Attach unit to master socket */
t_stat tmxr_attach (TMXR *mp, UNIT *uptr, char *cptr)
{
char* tptr;
t_stat r;
tptr = (char *) malloc (strlen (cptr) + 1); /* get string buf */
if (tptr == NULL) /* no more mem? */
return SCPE_MEM;
r = tmxr_open_master (mp, cptr); /* open master socket */
if (r != SCPE_OK) { /* error? */
free (tptr); /* release buf */
return SCPE_OPENERR;
}
strcpy (tptr, cptr); /* copy port */
uptr->filename = tptr; /* save */
uptr->flags = uptr->flags | UNIT_ATT; /* no more errors */
if (mp->dptr == NULL) /* has device been set? */
mp->dptr = find_dev_from_unit (uptr); /* no, so set device now */
return SCPE_OK;
}
/* Close master socket */
t_stat tmxr_close_master (TMXR *mp)
{
int32 i;
TMLN *lp;
for (i = 0; i < mp->lines; i++) { /* loop thru conn */
lp = mp->ldsc + i;
if (lp->conn /* if the line is connected */
&& (tmxr_is_extended == NULL /* and the line */
|| tmxr_is_extended (lp) == FALSE)) /* is not extended */
tmxr_disconnect_line (lp); /* then disconnect it */
} /* end for */
sim_close_sock (mp->master); /* close master socket */
mp->master = 0;
return SCPE_OK;
}
/* Detach unit from master socket */
t_stat tmxr_detach (TMXR *mp, UNIT *uptr)
{
if (!(uptr->flags & UNIT_ATT)) /* attached? */
return SCPE_OK;
tmxr_close_master (mp); /* close master socket */
free (uptr->filename); /* free port string */
uptr->filename = NULL;
uptr->flags = uptr->flags & ~UNIT_ATT; /* not attached */
return SCPE_OK;
}
/* Stub examine and deposit */
t_stat tmxr_ex (t_value *vptr, t_addr addr, UNIT *uptr, int32 sw)
{
return SCPE_NOFNC;
}
t_stat tmxr_dep (t_value val, t_addr addr, UNIT *uptr, int32 sw)
{
return SCPE_NOFNC;
}
/* Output message to socket or line descriptor */
void tmxr_msg (SOCKET sock, const char *msg)
{
if (sock)
sim_write_sock (sock, msg, strlen (msg));
return;
}
void tmxr_linemsg (TMLN *lp, const char *msg)
{
int32 len;
for (len = strlen (msg); len > 0; --len)
tmxr_putc_ln (lp, *msg++);
return;
}
/* Print connections - used only in named SHOW command */
void tmxr_fconns (FILE *st, TMLN *lp, int32 ln)
{
if (ln >= 0)
fprintf (st, "line %d: ", ln);
if (lp->conn) {
int32 hr, mn, sc;
uint32 ctime;
ctime = (sim_os_msec () - lp->cnms) / 1000;
hr = ctime / 3600;
mn = (ctime / 60) % 60;
sc = ctime % 60;
tmxr_show (lp, st); /* display the port connection */
if (ctime)
fprintf (st, ", connected %02d:%02d:%02d\n", hr, mn, sc);
}
else fprintf (st, "line disconnected\n");
if (lp->txlog)
fprintf (st, "Logging to %s\n", lp->txlogname);
return;
}
/* Print statistics - used only in named SHOW command */
void tmxr_fstats (FILE *st, TMLN *lp, int32 ln)
{
static const char *enab = "on";
static const char *dsab = "off";
if (ln >= 0)
fprintf (st, "line %d: ", ln);
if (lp->conn) {
fprintf (st, "input (%s) queued/total = %d/%d, ",
(lp->rcve? enab: dsab),
lp->rxbpi - lp->rxbpr, lp->rxcnt);
fprintf (st, "output (%s) queued/total = %d/%d\n",
(lp->xmte? enab: dsab),
lp->txbpi - lp->txbpr, lp->txcnt);
}
else fprintf (st, "line disconnected\n");
return;
}
/* Disconnect line */
t_stat tmxr_dscln (UNIT *uptr, int32 val, char *cptr, void *desc)
{
TMXR *mp = (TMXR *) desc;
TMLN *lp;
int32 ln;
t_stat r;
if (mp == NULL)
return SCPE_IERR;
if (val) { /* = n form */
if (cptr == NULL)
return SCPE_ARG;
ln = (int32) get_uint (cptr, 10, mp->lines - 1, &r);
if (r != SCPE_OK)
return SCPE_ARG;
lp = mp->ldsc + ln;
}
else {
lp = tmxr_find_ldsc (uptr, 0, mp);
if (lp == NULL)
return SCPE_IERR;
}
if (lp->conn) {
tmxr_linemsg (lp, "\r\nOperator disconnected line\r\n\n");
tmxr_reset_ln (lp);
}
return SCPE_OK;
}
/* Enable logging for line.
This routine opens the log file whose name is specified by "cptr" for the
multiplexer line associated with "uptr" or, if NULL, for the line number
specified by "val". "desc" contains a pointer to the multiplexer descriptor.
If opening is successful, the routine then adds the descriptor pointer to the
table of descriptors, which is used to flush and eventually close the log
files.
Implementation notes:
1. Table entries are not removed, so a NULL entry indicates both the end of
the active list and the first available space.
*/
t_stat tmxr_set_log (UNIT *uptr, int32 val, char *cptr, void *desc)
{
TMXR *mp = (TMXR *) desc;
TMLN *lp;
uint32 index;
if (cptr == NULL) /* no file name? */
return SCPE_2FARG;
lp = tmxr_find_ldsc (uptr, val, mp); /* find line desc */
if (lp == NULL)
return SCPE_IERR;
if (lp->txlog) /* close existing log */
tmxr_set_nolog (NULL, val, NULL, desc);
lp->txlogname = (char *) calloc (CBUFSIZE, sizeof (char)); /* alloc namebuf */
if (lp->txlogname == NULL) /* can't? */
return SCPE_MEM;
strncpy (lp->txlogname, cptr, CBUFSIZE); /* save file name */
if (sim_switches & SWMASK ('N')) /* if a new log file is requested */
lp->txlog = fopen (cptr, "wb"); /* then open an empty file for writing */
else /* otherwise */
lp->txlog = fopen (cptr, "ab"); /* open an existing file for appending */
if (lp->txlog == NULL) { /* error? */
free (lp->txlogname); /* free buffer */
return SCPE_OPENERR;
}
else { /* otherwise if the open succeeded */
for (index = 0; index < TABLE_COUNT; index++) /* loop through the table entries */
if (tmxr_table [index] == mp) /* if the mux descriptor is already present */
break; /* then we're done */
else if (tmxr_table [index] == NULL) { /* otherwise if the entry is empty */
tmxr_table [index] = mp; /* then store the new descriptor */
break; /* and we're done */
}
if (index == TABLE_COUNT) /* if there are no empty entries */
return SCPE_IERR; /* then report an internal error */
else /* otherwise the descriptor was */
return SCPE_OK; /* either already present or added */
}
}
/* Disable logging for line */
t_stat tmxr_set_nolog (UNIT *uptr, int32 val, char *cptr, void *desc)
{
TMXR *mp = (TMXR *) desc;
TMLN *lp;
if (cptr) /* no arguments */
return SCPE_2MARG;
lp = tmxr_find_ldsc (uptr, val, mp); /* find line desc */
if (lp == NULL)
return SCPE_IERR;
if (lp->txlog) { /* logging? */
fclose (lp->txlog); /* close log */
free (lp->txlogname); /* free namebuf */
lp->txlog = NULL;
lp->txlogname = NULL;
}
return SCPE_OK;
}
/* Flush and optionally close all log files.
This routine flushes or closes all active terminal multiplexer line logs,
depending on the value of the boolean parameter. The routine uses the table
of multiplexer descriptors constructed by the "tmxr_set_log" routine to
identify the active lines. The line structure array associated with each
descriptor is examined in sequence for active logs. Each one that is found
is flushed to post the contents to disc and left open, or closed and marked
inactive, as directed by the supplied parameter.
Implementation notes:
1. The table is organized so that a NULL entry indicates that no additional
descriptors will be found. That is, descriptors always appear at the
beginning of the table.
*/
void tmxr_post_logs (t_bool close_logs)
{
uint32 index;
int32 line, line_count;
TMXR *mptr;
TMLN *lptr;
for (index = 0; index < TABLE_COUNT; index++) /* look through the descriptor list */
if (tmxr_table [index] == NULL) /* until all entries */
break; /* have been seen */
else { /* for each active entry */
mptr = tmxr_table [index]; /* get the entry */
lptr = mptr->ldsc; /* and the line array */
line_count = mptr->lines; /* and the number of lines */
for (line = 0; line < line_count; line++, lptr++) /* for all lines in the array */
if (lptr->txlog != NULL) /* if the current line's log is active */
if (close_logs) /* then if closing is requested */
tmxr_set_nolog (NULL, line, NULL, /* then close the log */
(void *) mptr);
else /* otherwise */
fflush (lptr->txlog); /* flush the log and leave it open */
}
return;
}
/* Show logging status for line */
t_stat tmxr_show_log (FILE *st, UNIT *uptr, int32 val, void *desc)
{
TMXR *mp = (TMXR *) desc;
TMLN *lp;
lp = tmxr_find_ldsc (uptr, val, mp); /* find line desc */
if (lp == NULL)
return SCPE_IERR;
if (lp->txlog)
fprintf (st, "logging to %s", lp->txlogname);
else fprintf (st, "no logging");
return SCPE_OK;
}
/* Find line descriptor.
Note: This routine may be called with a UNIT that does not belong to the
device indicated in the TMXR structure. That is, the multiplexer lines may