forked from akito85/tcptrace-modified
-
Notifications
You must be signed in to change notification settings - Fork 0
/
dyncounter.c
executable file
·759 lines (600 loc) · 16.3 KB
/
dyncounter.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
/*
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2004
* Ohio University.
*
* ---
*
* Starting with the release of tcptrace version 6 in 2001, tcptrace
* is licensed under the GNU General Public License (GPL). We believe
* that, among the available licenses, the GPL will do the best job of
* allowing tcptrace to continue to be a valuable, freely-available
* and well-maintained tool for the networking community.
*
* Previous versions of tcptrace were released under a license that
* was much less restrictive with respect to how tcptrace could be
* used in commercial products. Because of this, I am willing to
* consider alternate license arrangements as allowed in Section 10 of
* the GNU GPL. Before I would consider licensing tcptrace under an
* alternate agreement with a particular individual or company,
* however, I would have to be convinced that such an alternative
* would be to the greater benefit of the networking community.
*
* ---
*
* This file is part of Tcptrace.
*
* Tcptrace was originally written and continues to be maintained by
* Shawn Ostermann with the help of a group of devoted students and
* users (see the file 'THANKS'). The work on tcptrace has been made
* possible over the years through the generous support of NASA GRC,
* the National Science Foundation, and Sun Microsystems.
*
* Tcptrace is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Tcptrace is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tcptrace (in the file 'COPYING'); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Author: Shawn Ostermann
* School of Electrical Engineering and Computer Science
* Ohio University
* Athens, OH
* ostermann@cs.ohiou.edu
* http://www.tcptrace.org/
*/
#include "tcptrace.h"
static char const GCC_UNUSED copyright[] =
"@(#)Copyright (c) 2004 -- Ohio University.\n";
static char const GCC_UNUSED rcsid[] =
"@(#)$Header: /usr/local/cvs/tcptrace/dyncounter.c,v 1.7 2003/11/19 14:38:01 sdo Exp $";
/* dynamic counters/arrays */
/* uses a 10-ary tree to manage a sparse counter space */
#include "dyncounter.h"
static int ldebug = 0;
/* external routines */
void *MallocZ(int nbytes);
/* WIDTH of the nodes (designed for 10, caveat emptor!) */
/* (sdo: tested at 2, 5, 10, 100) */
#define CARDINALITY 10
/* 10-ary tree node */
struct node {
u_long depth; /* 1, 10, 100, 1000 ... 10,000,000 */
union {
struct node *down[CARDINALITY]; /* if depth != 1 */
u_long value[CARDINALITY]; /* if depth == 1 */
} un;
struct node *nextleaf; /* linked list of leaves, for NextCounter() */
u_long prefix; /* from trees above */
};
/* dynamically-sized counter structure */
struct dyn_counter {
u_long gran; /* granularity of the IX */
u_long maxix; /* NOT scaled */
u_long minix; /* NOT scaled */
u_long maxcount;
u_long total_count; /* sum of the "AddToCounters" call values */
struct node *tree;
/* linked list of leaves */
struct node *firstleaf;
struct node *lastleaf;
};
/* local routines */
static struct dyn_counter *MakeCounterStruct(void);
static struct node *NewNode(u_long depth);
static u_long *FindTwig(struct node *lastnode, u_long ix);
static struct node *FindLeaf( struct dyn_counter *pdc, struct node **ptree,
u_long depth, u_long value, int fcreate);
static u_long *FindCounter(struct dyn_counter **ppdc, u_long ix, int fcreate);
static void PrintTree(struct node *tree);
static void PrintTreeRecurse(struct node *tree, u_long depth);
static void FinishTree(struct dyn_counter *pdc);
static void FinishTreeRecurse(struct dyn_counter *pdc, struct node *pnode,
u_long prefix, u_long depth);
static void PrintLeafList(struct dyn_counter *pdc);
static struct node *NextCounterRecurse(struct node *node, u_long nextix,
u_long *pix, u_long *pcount);
static struct node *MakeDepth(struct node *node, u_long depth);
static void DestroyTree(struct node *pnode);
static void MakeCounter(struct dyn_counter **ppdc, u_long ix,
u_long val, u_long granularity, char set);
/* add a value to a counter */
void
AddToCounter(
struct dyn_counter **ppdc,
u_long ix,
u_long val,
u_long granularity)
{
if (ldebug)
fprintf(stderr,"AddToCounter(%p, %lu, %lu) called\n", *ppdc, ix, val);
MakeCounter(ppdc,ix,val,granularity,0);
}
/* set a value in a counter */
void
SetCounter(
struct dyn_counter **ppdc,
u_long ix,
u_long val,
u_long granularity)
{
if (ldebug)
fprintf(stderr,"SetCounter(%p, %lu, %lu) called\n", *ppdc, ix, val);
MakeCounter(ppdc,ix,val,granularity,1);
}
/* read only, doesn't MAKE anything */
u_long
LookupCounter(
struct dyn_counter *pdc,
u_long ix)
{
u_long *pdigit;
if (ldebug)
fprintf(stderr,"LookupCounter(p,%lu) called\n", ix);
/* try to find the counter */
pdigit = FindCounter(&pdc,
ix,
0); /* do NOT create */
if (pdigit == NULL) {
/* no leaf node == no such counter */
if (ldebug)
fprintf(stderr,"LookupCounter(p,%lu): no such leaf\n", ix);
return(0);
}
return(*pdigit);
}
int
NextCounter(
struct dyn_counter **ppdc,
void *pvoidcookie,
u_long *pix,
u_long *pcount)
{
struct dyn_counter *pdc;
struct node *node;
u_long nextix;
if (ldebug)
fprintf(stderr,"NextCounter(p,%p,%lu,%lu) called\n",
*((char **)pvoidcookie), *pix, *pcount);
/* if the counter tree doesn't exist yet, create it */
if (*ppdc == NULL) {
*ppdc = MakeCounterStruct();
}
pdc = *ppdc;
/* scale ix by granularity */
*pix /= pdc->gran;
/* make sure the linked list of leaves is up to date */
if (pdc->firstleaf == NULL) {
FinishTree(pdc);
if (ldebug) {
PrintLeafList(pdc);
PrintTree(pdc->tree);
}
}
/* if cookie is NULL, start at the head */
if ((*((struct node **)pvoidcookie)) == NULL) {
node = pdc->firstleaf;
nextix = 0;
} else {
node = *((struct node **)pvoidcookie);
nextix = ((*pix) % CARDINALITY) + 1;
}
/* sanity check on cookie */
if (node->depth != 1) {
fprintf(stderr,"NextCounter: invalid cookie!\n");
exit(1);
}
/* recurse and solve */
node = NextCounterRecurse(node,nextix,pix,pcount);
if (node == NULL)
return(0); /* no more */
/* scale ix by granularity */
*pix *= pdc->gran;
/* remember cookie for next time */
*((struct node **)pvoidcookie) = node;
return(1);
}
/* access routine - maximum counter value */
u_long
GetMaxCount(
struct dyn_counter *pdc)
{
return(pdc->maxcount);
}
/* access routine - return MAX index */
u_long
GetMaxIx(
struct dyn_counter *pdc)
{
return(pdc->maxix);
}
/* access routine - return MIN index */
u_long
GetMinIx(
struct dyn_counter *pdc)
{
return(pdc->minix);
}
/* access routine - return stored granularity */
u_long
GetGran(
struct dyn_counter *pdc)
{
if (pdc == NULL)
return(1);
return(pdc->gran);
}
/* access routine - total value added with AddToCounter() */
u_long
GetTotalCounter(
struct dyn_counter *pdc)
{
if (pdc == NULL)
return(0);
return(pdc->total_count);
}
void
DestroyCounters(
dyn_counter *phandle)
{
if (!*phandle)
return;
if ((*phandle)->tree)
DestroyTree((*phandle)->tree);
free(*phandle);
*phandle = NULL;
}
static struct dyn_counter *
MakeCounterStruct()
{
struct dyn_counter *pdc = MallocZ(sizeof(struct dyn_counter));
pdc->minix = 0xffffffff;
return(pdc);
}
static void
DestroyTree(
struct node *pnode)
{
int i;
if (pnode == NULL)
return;
if (pnode->depth > 1) {
/* recurse and delete */
for (i=0; i < CARDINALITY; ++i) {
DestroyTree(pnode->un.down[i]);
}
}
/* destroy ME */
free(pnode);
return;
}
/* the heart of the routines, a 10-ary recursize search */
static struct node *
FindLeaf(
struct dyn_counter *pdc,
struct node **ptree,
u_long depth,
u_long value,
int fcreate)
{
u_long hidigit;
u_long lowdigits;
u_long valdepth;
u_long valunits;
u_long temp_value;
if (ldebug)
fprintf(stderr,"FindLeaf(%p(depth %lu), %lu, %s) called\n",
*ptree,
*ptree?((*ptree)->depth):0,
value,
fcreate?"CREATE":"NOCREATE");
/* if the tree is empty and we haven't asked to "create", then not found */
if ((*ptree == NULL) && (!fcreate))
return(NULL);
/* determine the units of the MSDigit (the depth) */
valdepth = 1;
valunits = 1;
temp_value = value;
while (temp_value >= CARDINALITY) {
temp_value /= CARDINALITY;
++valdepth;
valunits *= CARDINALITY;
}
if (ldebug)
fprintf(stderr,"FindLeaf: value:%lu depth:%lu units:%lu\n",
value, valdepth, valunits);
/* is the tree deep enough? */
if ((*ptree == NULL) || (valdepth > (*ptree)->depth)) {
u_long correct_depth;
/* the correct depth is the MAX of: */
/* - the depth of the number we're looking for */
/* - the value of "depth" passed down */
correct_depth = depth;
if (valdepth > correct_depth)
correct_depth = valdepth;
/* if the tree isn't that deep and we haven't asked to create, then not found */
if (!fcreate)
return(NULL);
/* increase the depth of this branch */
*ptree = MakeDepth((*ptree), correct_depth);
/* linked list of leaves no longer valid! */
pdc->firstleaf = NULL;
/* adjust */
depth = correct_depth;
}
/* if we're at the leaf depth, then we're done */
if ((*ptree)->depth == 1)
return(*ptree);
/* if the "depth" of val is less than the depth of this node,
recurse down the "0" branch without changing the number */
if (valdepth < (*ptree)->depth) {
return(FindLeaf(pdc,
&(*ptree)->un.down[0],
depth-1,
value,
fcreate));
}
/* (else), already the correct level */
/* break the number into the MSDigit and LSDigits */
hidigit = value / valunits;
lowdigits = value % valunits;
if (ldebug)
fprintf(stderr,"for value %lu, depth:%lu units:%lu hidigit:%lu lowdigits:%lu\n",
value, valdepth, valunits, hidigit, lowdigits);
/* recurse */
return(FindLeaf(pdc,
&(*ptree)->un.down[hidigit],
depth-1,
lowdigits,
fcreate));
}
static struct node *
MakeDepth(
struct node *node,
u_long depth)
{
struct node *newroot;
if ((node != NULL) && (node->depth >= depth))
return(node);
/* ELSE, insert a new level and recurse */
newroot = NewNode(depth);
/* attach the old part of the tree */
if (depth > 1)
newroot->un.down[0] = MakeDepth(node,depth-1);
/* return the new root */
return(newroot);
}
static struct node *
NewNode(
u_long depth)
{
struct node *pn;
if (ldebug)
fprintf(stderr,"NewNode(%lu) called\n", depth);
pn = MallocZ(sizeof(struct node));
pn->depth = depth;
return(pn);
}
static u_long *
FindTwig(
struct node *lastnode,
u_long ix)
{
unsigned digit;
if (ldebug)
fprintf(stderr,"FindTwig(%p(depth %lu), %lu) called\n",
lastnode, lastnode->depth, ix);
if (lastnode->depth != 1) {
fprintf(stderr,"FindTwig: internal error, not at a leaf node\n");
exit(2);
}
digit = ix % CARDINALITY;
return(&(lastnode->un.value[digit]));
}
static u_long *
FindCounter(
struct dyn_counter **ppdc,
u_long ix,
int fcreate)
{
struct dyn_counter *pdc;
struct node *pnode;
u_long *pcounter;
if (ldebug)
fprintf(stderr,"FindCounter(p, %lu) called\n", ix);
/* if the counter tree doesn't exist yet, create it */
if (*ppdc == NULL) {
*ppdc = MakeCounterStruct();
}
pdc = *ppdc;
/* track MAX and MIN */
if (ix > pdc->maxix)
pdc->maxix = ix;
if (ix < pdc->minix)
pdc->minix = ix;
if (ldebug>1)
PrintTree(pdc->tree);
/* scale (TRUNCATE) the index by the granularity */
ix /= (*ppdc)->gran;
/* find the leaf node */
pnode = FindLeaf(pdc, &pdc->tree,
pdc->tree?pdc->tree->depth:1,
ix, fcreate);
if (pnode == NULL)
return(NULL);
/* find the right counter */
pcounter = FindTwig(pnode, ix);
return(pcounter);
}
static void Indent(int depth)
{
int i;
for (i=0; i < depth; ++i)
fputc(' ', stderr);
}
static void PrintTree(
struct node *tree)
{
PrintTreeRecurse(tree,0);
}
static void
PrintTreeRecurse(
struct node *tree,
u_long indent)
{
int i;
if (tree == NULL) {
Indent(indent);
fprintf(stderr,"NULL\n");
return;
}
Indent(indent);
fprintf(stderr,"Node %p, depth:%lu, prefix:%lu\n", tree, tree->depth, tree->prefix);
if (tree->depth == 1) {
for (i=0; i < CARDINALITY; ++i) {
Indent(indent);
fprintf(stderr,"Leaf[%d]: %lu (value:%lu)\n",
i,
tree->un.value[i],
tree->prefix*CARDINALITY+i);
}
} else {
for (i=0; i < CARDINALITY; ++i) {
Indent(indent);
fprintf(stderr,"Branch %d (prefix %lu, depth %lu)\n",
i, tree->prefix*CARDINALITY+i, tree->depth);
PrintTreeRecurse(tree->un.down[i],
indent+3);
}
}
}
static void
FinishTree(
struct dyn_counter *pdc)
{
FinishTreeRecurse(pdc, pdc->tree, 0, pdc->tree->depth);
}
static void
FinishTreeRecurse(
struct dyn_counter *pdc,
struct node *pnode,
u_long prefix,
u_long depth)
{
int i;
/* special case, empty tree */
if (pnode == NULL)
return;
/* sanity check, verify depth */
if (pnode->depth != depth) {
fprintf(stderr,"FinishTree: bad depth at node %p (%lu should be %lu)\n",
pnode, pnode->depth, depth);
PrintTree(pdc->tree);
exit(-3);
}
/* insert prefix */
pnode->prefix = prefix;
/* if we're a leaf, add to end of the list */
if (pnode->depth == 1) {
if (pdc->firstleaf == NULL) {
pdc->firstleaf = pdc->lastleaf = pnode;
if (ldebug)
fprintf(stderr,"FinishTree: Making %p the head\n", pnode);
} else {
pdc->lastleaf->nextleaf = pnode;
pdc->lastleaf = pnode;
if (ldebug)
fprintf(stderr,"FinishTree: Making %p the tail\n", pnode);
}
return;
}
/* recurse down all branches */
for (i=0; i < CARDINALITY; ++i) {
FinishTreeRecurse(pdc, pnode->un.down[i], prefix*CARDINALITY+i, depth-1);
}
}
static void
PrintLeafList(
struct dyn_counter *ptree)
{
struct node *pnode = ptree->firstleaf;
fprintf(stderr,"Leaf Linked List...\n");
while(pnode) {
fprintf(stderr," pnode:%p prefix:%lu\n", pnode, pnode->prefix);
pnode = pnode->nextleaf;
}
}
static struct node *
NextCounterRecurse(
struct node *node,
u_long nextix,
u_long *pix,
u_long *pcount)
{
int i;
if (ldebug)
fprintf(stderr,"NextCounterRecurse(%p,%lu,%lu,%lu) called\n",
node, nextix, *pix, *pcount);
/* base case, NULL */
if (node == NULL)
return(NULL);
/* first, check the rest of THIS leaf node */
for (i=nextix; i < CARDINALITY; ++i) {
if (node->un.value[i] != 0) {
*pix = node->prefix*CARDINALITY+i;
*pcount = node->un.value[i];
return(node);
}
}
/* check each counter in the NEXT leaf */
return(NextCounterRecurse(node->nextleaf, 0, pix, pcount));
}
/* internal counter access routine */
static void
MakeCounter(
struct dyn_counter **ppdc,
u_long ix,
u_long val,
u_long granularity,
char is_set) /* "set" as opposed to "add" */
{
u_long *pcounter;
/* if the counter tree doesn't exist yet, create it */
if (*ppdc == NULL) {
*ppdc = MakeCounterStruct();
}
/* check granularity */
if ((*ppdc)->gran == 0) {
(*ppdc)->gran = granularity;
} else {
/* error check */
if ((*ppdc)->gran != granularity) {
fprintf(stderr,"DYNCOUNTER: internal error, granularity changed\n");
exit(-1);
}
}
/* find/create the counter */
pcounter = FindCounter(ppdc, ix, 1);
/* add or set */
if (is_set) {
/* counter = val */
*pcounter = val;
} else {
/* counter += val */
*pcounter += val;
(*ppdc)->total_count += val;
}
/* check MAX counter value */
if (*pcounter > (*ppdc)->maxcount)
(*ppdc)->maxcount = *pcounter;
return;
}