aboutsummaryrefslogtreecommitdiffstats
path: root/lib/erl_interface/src/misc/show_msg.c
blob: 9ed27f49d566f00f25a16e3466a870ad6f3042ee (plain) (blame)
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
/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 1998-2009. All Rights Reserved.
 * 
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * %CopyrightEnd%
 *

 */
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

#include <sys/types.h>

#include "eidef.h"

#ifndef __WIN32__
#  ifdef TIME_WITH_SYS_TIME
#    include <sys/time.h>
#    include <time.h>
#  else
#    ifdef HAVE_SYS_TIME_H
#       include <sys/time.h>
#    else
#       include <time.h>
#    endif
#  endif
#endif

#include "eiext.h"
#include "putget.h"
#include "ei_printterm.h"
#include "ei_internal.h"
#include "show_msg.h"

#ifndef EISHOWBUF
#define EISHOWBUF 512
#endif

static void show_term(const char *termbuf, int *index, FILE *stream);
static void show_pid(FILE *stream, const erlang_pid *pid);
static void show_trace(FILE *stream, const erlang_trace *t);
static void show_msg(FILE *stream, int direction, const erlang_msg *msg,
		    const char *buf);
static void ei_efprint(FILE *stream, const char *termbuf);
static int ei_decode_skip_bignum(const char *buf, int *index, void *p);
static int printable_list_p(const uint8 *buf, int buflen);


/***************************************************************************
 *
 *  Write trace information to stderr
 *
 ***************************************************************************/

void ei_trace_printf(const char *name, int level, const char *format,...)
{
    time_t now;
    char *timestr;
    char buf[2048];
    int len;
    va_list args;

    va_start(args, format);

    time(&now);
    timestr = (char *)ctime(&now);
    sprintf(buf, "%s: %.*s: ", name, (int) strlen(timestr)-1, timestr);
    len = strlen(buf);
    vsprintf(buf + len, format, args);
    fprintf(stderr,"%s\r\n",buf);
    va_end(args);
}


/***************************************************************************
 *
 *  Debug printing of incoming and outgoing messages
 *
 ***************************************************************************/

/*
 * FIXME maybe this function should be rewritten to use ei_printterm instead
 * (or the other way around)
 */

/* 
 * the new TT stuff has been added, but when these messages are shown
 * they will look just like the non-tt ones for now.
 */
   
/*
 * this should be long enough for longest atoms (256) but short enough for
 * fprintf to handle all at once (a few kb probably).
 */


void ei_show_recmsg(FILE *stream, erlang_msg *msg, char *buf)
{
    show_msg(stream, 0, msg, buf);
}


/* decode the buffer again before showing it */
int ei_show_sendmsg(FILE *stream, const char *header, const char *msgbuf)
{
    erlang_msg msg;
    const char *mbuf = NULL;
    int index = 0;
    int arity = 0;
    int version = 0;

    /* skip five bytes */
    index = 5;
    ei_decode_version(header,&index,&version);
    ei_decode_tuple_header(header,&index,&arity);
    ei_decode_long(header,&index,&msg.msgtype);

    switch (msg.msgtype) {
    case ERL_SEND:
	if (ei_decode_atom(header,&index,msg.cookie) 
	    || ei_decode_pid(header,&index,&msg.to)) return -1;
	mbuf = msgbuf;
	break;

    case ERL_SEND_TT:
	if (ei_decode_atom(header,&index,msg.cookie) 
	    || ei_decode_pid(header,&index,&msg.to)
	    || ei_decode_trace(header,&index,&msg.token)) return -1;
	mbuf = msgbuf;
	break;
    
    case ERL_REG_SEND:
	if (ei_decode_pid(header,&index,&msg.from) 
	    || ei_decode_atom(header,&index,msg.cookie) 
	    || ei_decode_atom(header,&index,msg.toname)) return -1;
	mbuf = msgbuf;
	break;
    
    case ERL_REG_SEND_TT:
	if (ei_decode_pid(header,&index,&msg.from) 
	    || ei_decode_atom(header,&index,msg.cookie) 
	    || ei_decode_atom(header,&index,msg.toname)
	    || ei_decode_trace(header,&index,&msg.token)) return -1;
	mbuf = msgbuf;
	break;

    case ERL_EXIT:
    case ERL_EXIT2:
	if (ei_decode_pid(header,&index,&msg.from) 
	    || ei_decode_pid(header,&index,&msg.to)) return -1;
	mbuf = header+index;

    case ERL_EXIT_TT:
    case ERL_EXIT2_TT:
	if (ei_decode_pid(header,&index,&msg.from) 
	    || ei_decode_pid(header,&index,&msg.to)
	    || ei_decode_trace(header,&index,&msg.token)) return -1;
	mbuf = header+index;
	break;
    
    case ERL_LINK:
    case ERL_UNLINK:
    case ERL_GROUP_LEADER:
	if (ei_decode_pid(header,&index,&msg.from) 
	    || ei_decode_pid(header,&index,&msg.to)) return -1;
	mbuf = header;
	break;
    
    case ERL_NODE_LINK:
	/* nothing to do */
	mbuf = header;
	break;

    default:
	break;
    }

    show_msg(stream, 1, &msg, mbuf);

    return 0;
}


/***************************************************************************
 *
 *  Common function for ei_show_recmsg() and ei_show_sendmsg()
 *
 ***************************************************************************/

static void show_msg(FILE *stream, int direction, const erlang_msg *msg,
		     const char *buf)
{
    if (direction) fprintf(stream,"-> ");
    else fprintf(stream,"<- ");
  
    switch (msg->msgtype) {
    case ERL_LINK:
	fprintf(stream,"LINK From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	break;
      
    case ERL_SEND:
	fprintf(stream,"SEND To: ");
	show_pid(stream,&msg->to);
	fprintf(stream,"\n   ");
	/* show the message */
	ei_efprint(stream,buf);
	break;
      
    case ERL_EXIT:
	fprintf(stream,"EXIT From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	/* show the reason */
	fprintf(stream,"\n   Reason: ");
	ei_efprint(stream,buf);
	break;
      
    case ERL_UNLINK:
	fprintf(stream,"UNLINK From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	break;
      
    case ERL_NODE_LINK:
	fprintf(stream,"NODE_LINK");
	break;
      
    case ERL_REG_SEND:
	fprintf(stream,"REG_SEND From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: %s\n   ",msg->toname);
	/* show the message */
	ei_efprint(stream,buf);
	break;
      
    case ERL_GROUP_LEADER:
	fprintf(stream,"GROUP_LEADER From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	break;
      
    case ERL_EXIT2:
	fprintf(stream,"EXIT2 From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	/* show the reason */
	fprintf(stream,"\n   Reason: ");
	ei_efprint(stream,buf);
	break;

	/* the new TT stuff below */

    case ERL_EXIT_TT:
	fprintf(stream,"EXIT_TT From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	fprintf(stream,"\n   ");
	show_trace(stream,&msg->token);
	/* show the reason */
	fprintf(stream,"\n   Reason: ");
	ei_efprint(stream,buf);
	break;
    
    case ERL_EXIT2_TT:
	fprintf(stream,"EXIT2_TT From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: ");
	show_pid(stream,&msg->to);
	fprintf(stream,"\n   ");
	show_trace(stream,&msg->token);
	/* show the reason */
	fprintf(stream,"\n   Reason: ");
	ei_efprint(stream,buf);
	break;
    
    case ERL_SEND_TT:
	fprintf(stream,"SEND_TT To: ");
	show_pid(stream,&msg->to);
	fprintf(stream,"\n   ");
	show_trace(stream,&msg->token);
	fprintf(stream,"\n   ");
	/* show the message */
	ei_efprint(stream,buf);
	break;

    case ERL_REG_SEND_TT:
	fprintf(stream,"REG_SEND_TT From: ");
	show_pid(stream,&msg->from);
	fprintf(stream," To: %s\n   ",msg->toname);
	show_trace(stream,&msg->token);
	fprintf(stream,"\n   ");
	/* show the message */
	ei_efprint(stream,buf);
	break;

    default:
	fprintf(stream,"Unknown message type: %ld",msg->msgtype);
    }
    fprintf(stream,"\n");
}

/***************************************************************************
 *
 *  Print term to stream with fprintf
 *
 ***************************************************************************/


static void ei_efprint(FILE *stream, const char *termbuf)
{
    int index = 0;
    show_term(termbuf,&index,stream);
}

static void show_term(const char *termbuf, int *index, FILE *stream)
{
    int type;
    char smallbuf[EISHOWBUF];
    int version;
    long num;
    double fnum;
    erlang_pid pid;
    erlang_port port;
    erlang_ref ref;
    int i, len;
    char *s;

    ei_get_type_internal(termbuf,index,&type,&len);
  
    switch (type) {
    case ERL_VERSION_MAGIC:
	/* just skip past this */
	ei_decode_version(termbuf,index,&version);
	show_term(termbuf,index,stream);
	break;
      
    case ERL_ATOM_EXT:
	ei_decode_atom(termbuf,index,smallbuf);
	fprintf(stream,"%s",smallbuf);
	break;

    case ERL_STRING_EXT:
	/* strings can be much longer than EISHOWBUF */
	if (len < EISHOWBUF) s = smallbuf;
	else if (!(s = malloc(len+1))) break; /* FIXME just break if can't? */

	ei_decode_string(termbuf,index,s);

	if (printable_list_p((uint8 *)s,len)) {
	    /* just show it as it is */
	    fprintf(stream,"\"%s\"",s);
	} else {
	    /* show it as a list instead */
	    fprintf(stream,"[");
	    for (i=0; i<len; i++) {
		if (i > 0) fprintf(stream,", ");
		fprintf(stream,"%d",s[i]);
	    }
	    fprintf(stream,"]");
	}

	/* did we allocate anything? */
	if (s && (s != smallbuf)) free(s);

	break;

    /* FIXME add case using ei_decode_longlong */
    case ERL_SMALL_BIG_EXT:
    case ERL_SMALL_INTEGER_EXT:
    case ERL_INTEGER_EXT:
	if (ei_decode_long(termbuf,index,&num) == 0) {
	    fprintf(stream,"%ld",num);
	} else {
	    ei_decode_skip_bignum(termbuf,index,NULL);
	    fprintf(stream,"#Bignum");
	}
	break;

    case ERL_FLOAT_EXT:
    case NEW_FLOAT_EXT:
	ei_decode_double(termbuf,index,&fnum);
	fprintf(stream,"%f",fnum);
	break;

    case ERL_PID_EXT:
	ei_decode_pid(termbuf,index,&pid);
	show_pid(stream,&pid);
	break;
    
    case ERL_SMALL_TUPLE_EXT:
    case ERL_LARGE_TUPLE_EXT:
	ei_decode_tuple_header(termbuf,index,&len);
	fprintf(stream,"{");
	for (i=0; i<len; i++) {
	    if (i > 0) fprintf(stream,", ");
	    show_term(termbuf,index,stream);
	}
	fprintf(stream,"}");
	break;
    
    case ERL_LIST_EXT:
	ei_decode_list_header(termbuf,index,&len);
	fprintf(stream,"[");
	for (i=0; i<len; i++) {
	    if (i > 0) fprintf(stream,", ");
	    show_term(termbuf,index,stream);
	}
	/* get the empty list at the end */
	ei_decode_list_header(termbuf,index,&len);
	fprintf(stream,"]");
	break;

    case ERL_NIL_EXT:
	ei_decode_list_header(termbuf,index,&len);
	fprintf(stream,"[]");
	break;
    
    case ERL_REFERENCE_EXT:
    case ERL_NEW_REFERENCE_EXT:
	ei_decode_ref(termbuf,index,&ref);
	fprintf(stream,"#Ref<%s",ref.node);
	for (i = 0; i < ref.len; i++) {
	    fprintf(stream,".%u",ref.n[i]);
	}
	fprintf(stream,".%u>",ref.creation);
	break;

    case ERL_PORT_EXT:
	ei_decode_port(termbuf,index,&port);
	fprintf(stream,"#Port<%s.%u.%u>",port.node,port.id,port.creation);
	break;
      
    case ERL_BINARY_EXT:
	ei_decode_binary(termbuf,index,NULL,&num);
	fprintf(stream,"#Bin<%ld>",num);
	break;
    
    case ERL_LARGE_BIG_EXT:
	/* doesn't actually decode - just skip over it */
	/* FIXME if GMP, what to do here?? */
	ei_decode_skip_bignum(termbuf,index,NULL);
	fprintf(stream,"#Bignum");
	break;
    
    case ERL_FUN_EXT: {
	char atom[MAXATOMLEN+1];
	long idx;
	long uniq;
	const char* s = termbuf + *index, * s0 = s;
	int n_free;

	++s;
	n_free = get32be(s);
	*index += s - s0;
	ei_decode_pid(termbuf, index, NULL); /* skip pid */
	ei_decode_atom(termbuf, index, atom); /* get module, index, uniq */
	ei_decode_long(termbuf, index, &idx);
	ei_decode_long(termbuf, index, &uniq);
	fprintf(stream,"#Fun<%s.%ld.%ld>", atom, idx, uniq);
	for (i = 0; i < n_free; ++i) {
	    /* FIXME how to report error ?! */
	    if (ei_skip_term(termbuf, index) != 0)
		fprintf(stderr,"<ERROR> show_msg: unknown type of term !");
	}
	break;
    }
    default:
	fprintf(stream,"#Unknown<%d.%d>",type,len);
	/* unfortunately we don't know how to skip over this type in
	 * the buffer if we don't even know what it is, so we return.
	 */
	return;
	break;
    }
}

/***************************************************************************
 *
 *  this help function does the actual decoding of the
 *  terms and is used by both ei_efprint and ei_sprintt.
 *
 *  termbuf contains the undecoded term.
 *  idx is the current position in termbuf.
 *  stream is print destination, e.g. a FILE*
 *
 ***************************************************************************/

static void show_pid(FILE *stream, const erlang_pid *pid)
{
    fprintf(stream,"#Pid<%s.%u.%u.%u>",
	    pid->node,pid->num,pid->serial,pid->creation);
}

static void show_trace(FILE *stream, const erlang_trace *t)
{
    fprintf(stream,
	    "Trace: Label: %ld, Flags: 0x%lx serial: %ld, prev: %ld From: ",
	    t->label,t->flags,t->serial,t->prev);
    show_pid(stream,&t->from);
}

/***************************************************************************
 *
 *  Try do decide if a buffer only contains printable characters
 *
 ***************************************************************************/

/* we only need to initialize some of these (after 32 everything printable) */
/* FIXME they are not!!!! We use isprint() for now but we could create a */
/* custom print function that escape some non printable like \t and \n */
#if 0
static int non_printable[256] = {
    /*                  1                   2                   3   */
    /*  2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 */
    1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
    /*             \b\t\n\v\f\r                                     */
};
#endif

static int printable_list_p(const uint8 *buf, int buflen)
{
    int i;
  
    for (i=0; i<buflen; i++) if (!isprint(buf[i])) return 0;

    /* is printable */
    return 1;
}

/***************************************************************************
 *
 *  Skip over bignums, we can't print them
 *
 ***************************************************************************/

/* FIXME we can if bignum small enough or if we use Per's functions or
   if we have compiled in gmp support */

/* this function doesn't do anything but skip over the number in the buffer */
/* it doesn't really belong here either... */

static int ei_decode_skip_bignum(const char *buf, int *index, void *p)
{
    const char *s = buf + *index;
    const char *s0 = s;
    long n;
  
    switch (get8(s)) {
    case ERL_LARGE_BIG_EXT:
	n = get32be(s);
	s += n+1;
	break;
    
    default:
	erl_errno = EIO;
	return -1;
    }

    *index += s-s0;
  
    return 0;
}