ddcc1113d52e4f05dff9bb45915e66bdea16ed74
[openssl.git] / crypto / mem.c
1 /* crypto/mem.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <openssl/crypto.h>
62 #ifdef CRYPTO_MDEBUG_TIME
63 # include <time.h>      
64 #endif
65 #include <openssl/buffer.h>
66 #include <openssl/bio.h>
67 #include <openssl/lhash.h>
68 #include "cryptlib.h"
69
70 /* #ifdef CRYPTO_MDEBUG */
71 /* static int mh_mode=CRYPTO_MEM_CHECK_ON; */
72 /* #else */
73 static int mh_mode=CRYPTO_MEM_CHECK_OFF;
74 static unsigned long disabling_thread = 0;
75 /* #endif */
76 /* State CRYPTO_MEM_CHECK_ON exists only temporarily when the library
77  * thinks that certain allocations should not be checked (e.g. the data
78  * structures used for memory checking).  It is not suitable as an initial
79  * state: the library will unexpectedly enable memory checking when it
80  * executes one of those sections that want to disable checking
81  * temporarily.
82  *
83  * State CRYPTO_MEM_CHECK_ENABLE without ..._ON makes no sense whatsoever.
84  */
85
86 static unsigned long order=0;
87
88 static LHASH *amih=NULL;
89
90 typedef struct app_mem_info_st
91         {       
92         unsigned long thread;
93         const char *file;
94         int line;
95         const char *info;
96         struct app_mem_info_st *next;
97         int references;
98         } APP_INFO;
99
100 static LHASH *mh=NULL;
101
102 typedef struct mem_st
103         {
104         char *addr;
105         int num;
106         const char *file;
107         int line;
108 #ifdef CRYPTO_MDEBUG_THREAD
109         unsigned long thread;
110 #endif
111         unsigned long order;
112 #ifdef CRYPTO_MDEBUG_TIME
113         time_t time;
114 #endif
115         APP_INFO *app_info;
116         } MEM;
117
118 int CRYPTO_mem_ctrl(int mode)
119         {
120         int ret=mh_mode;
121
122         CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
123         switch (mode)
124                 {
125         /* for applications: */
126         case CRYPTO_MEM_CHECK_ON: /* aka MemCheck_start() */
127                 mh_mode = CRYPTO_MEM_CHECK_ON|CRYPTO_MEM_CHECK_ENABLE;
128                 disabling_thread = 0;
129                 break;
130         case CRYPTO_MEM_CHECK_OFF: /* aka MemCheck_stop() */
131                 mh_mode = 0;
132                 disabling_thread = 0;
133                 break;
134
135         /* switch off temporarily (for library-internal use): */
136         case CRYPTO_MEM_CHECK_DISABLE: /* aka MemCheck_off() */
137                 if (mh_mode & CRYPTO_MEM_CHECK_ON)
138                         {
139                         mh_mode&= ~CRYPTO_MEM_CHECK_ENABLE;
140                         if (disabling_thread != CRYPTO_thread_id())
141                                 {
142                                 CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
143                                 disabling_thread=CRYPTO_thread_id();
144                                 }
145                         }
146                 break;
147         case CRYPTO_MEM_CHECK_ENABLE: /* aka MemCheck_on() */
148                 if (mh_mode & CRYPTO_MEM_CHECK_ON)
149                         {
150                         mh_mode|=CRYPTO_MEM_CHECK_ENABLE;
151                         if (disabling_thread != 0)
152                                 {
153                                 disabling_thread=0;
154                                 CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
155                                 }
156                         }
157                 break;
158
159         default:
160                 break;
161                 }
162         CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
163         return(ret);
164         }
165
166 static int is_MemCheck_On()
167         {
168         int ret = 0;
169
170         if (mh_mode & CRYPTO_MEM_CHECK_ON)
171                 {
172                 CRYPTO_w_lock(CRYPTO_LOCK_MALLOC);
173
174                 ret = (mh_mode & CRYPTO_MEM_CHECK_ENABLE)
175                         && disabling_thread != CRYPTO_thread_id();
176
177                 CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC);
178                 }
179         return(ret);
180         }       
181
182 static int mem_cmp(MEM *a, MEM *b)
183         {
184         return(a->addr - b->addr);
185         }
186
187 static unsigned long mem_hash(MEM *a)
188         {
189         unsigned long ret;
190
191         ret=(unsigned long)a->addr;
192
193         ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
194         return(ret);
195         }
196
197 static int app_info_cmp(APP_INFO *a, APP_INFO *b)
198         {
199         return(a->thread - b->thread);
200         }
201
202 static unsigned long app_info_hash(APP_INFO *a)
203         {
204         unsigned long ret;
205
206         ret=(unsigned long)a->thread;
207
208         ret=ret*17851+(ret>>14)*7+(ret>>4)*251;
209         return(ret);
210         }
211
212 static APP_INFO *free_info(APP_INFO *app_info)
213         {
214         APP_INFO *next;
215
216         if (app_info == NULL)
217                 return NULL;
218
219         if (--(app_info->references) > 0)
220                 return app_info;
221
222         app_info->references = 0;
223
224         next = app_info->next;
225         app_info->next = NULL;  /* Just to make sure */
226
227         Free(app_info);
228         if (next != app_info)
229                 return free_info(next);
230         return NULL;
231         }
232                 
233 static APP_INFO *remove_info()
234         {
235         APP_INFO tmp;
236         APP_INFO *ret = NULL;
237
238         if (amih != NULL)
239                 {
240                 tmp.thread=CRYPTO_thread_id();
241                 if ((ret=(APP_INFO *)lh_delete(amih,(char *)&tmp)) != NULL)
242                         {
243                         APP_INFO *next=ret->next;
244 #ifdef LEVITTE_DEBUG
245                         if (ret->thread != tmp.thread)
246                                 {
247                                 fprintf(stderr, "remove_info(): deleted info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
248                                         ret->thread, tmp.thread);
249                                 abort();
250                                 }
251 #endif
252                         if (next != NULL)
253                                 {
254                                 lh_insert(amih,(char *)next);
255                                 }
256                         free_info(ret);
257                         }
258                 }
259         return(ret);
260         }
261
262 int CRYPTO_add_info(const char *file, int line, const char *info)
263         {
264         APP_INFO *ami, *amim;
265         int ret=0;
266
267         if (is_MemCheck_On())
268                 {
269                 MemCheck_off();
270
271                 if ((ami = (APP_INFO *)Malloc(sizeof(APP_INFO))) == NULL)
272                         {
273                         ret=0;
274                         goto err;
275                         }
276                 if (amih == NULL)
277                         {
278                         if ((amih=lh_new(app_info_hash,app_info_cmp)) == NULL)
279                                 {
280                                 Free(ami);
281                                 ret=0;
282                                 goto err;
283                                 }
284                         }
285
286                 ami->thread=CRYPTO_thread_id();
287                 ami->file=file;
288                 ami->line=line;
289                 ami->info=info;
290                 ami->references=1;
291                 ami->next=NULL;
292
293                 if ((amim=(APP_INFO *)lh_insert(amih,(char *)ami)) != NULL)
294                         {
295 #ifdef LEVITTE_DEBUG
296                         if (ami->thread != amim->thread)
297                                 {
298                                 fprintf(stderr, "CRYPTO_add_info(): previous info has other thread ID (%lu) than the current thread (%lu)!!!!\n",
299                                         amim->thread, ami->thread);
300                                 abort();
301                                 }
302 #endif
303                         ami->next=amim;
304                         }
305  err:
306                 MemCheck_on();
307                 }
308
309         return(ret);
310         }
311
312 int CRYPTO_remove_info()
313         {
314         int ret=0;
315
316         if (is_MemCheck_On())
317                 {
318                 MemCheck_off();
319
320                 ret=(remove_info() != NULL);
321
322                 MemCheck_on();
323                 }
324         return(ret);
325         }
326
327 static char *(*malloc_locked_func)()=(char *(*)())malloc;
328 static void (*free_locked_func)()=(void (*)())free;
329 static char *(*malloc_func)()=  (char *(*)())malloc;
330 static char *(*realloc_func)()= (char *(*)())realloc;
331 static void (*free_func)()=     (void (*)())free;
332
333 void CRYPTO_set_mem_functions(char *(*m)(), char *(*r)(), void (*f)())
334         {
335         if ((m == NULL) || (r == NULL) || (f == NULL)) return;
336         malloc_func=m;
337         realloc_func=r;
338         free_func=f;
339         malloc_locked_func=m;
340         free_locked_func=f;
341         }
342
343 void CRYPTO_set_locked_mem_functions(char *(*m)(), void (*f)())
344         {
345         if ((m == NULL) || (f == NULL)) return;
346         malloc_locked_func=m;
347         free_locked_func=f;
348         }
349
350 void CRYPTO_get_mem_functions(char *(**m)(), char *(**r)(), void (**f)())
351         {
352         if (m != NULL) *m=malloc_func;
353         if (r != NULL) *r=realloc_func;
354         if (f != NULL) *f=free_func;
355         }
356
357 void CRYPTO_get_locked_mem_functions(char *(**m)(), void (**f)())
358         {
359         if (m != NULL) *m=malloc_locked_func;
360         if (f != NULL) *f=free_locked_func;
361         }
362
363 void *CRYPTO_malloc_locked(int num)
364         {
365         return(malloc_locked_func(num));
366         }
367
368 void CRYPTO_free_locked(void *str)
369         {
370         free_locked_func(str);
371         }
372
373 void *CRYPTO_malloc(int num)
374         {
375         return(malloc_func(num));
376         }
377
378 void *CRYPTO_realloc(void *str, int num)
379         {
380         return(realloc_func(str,num));
381         }
382
383 void CRYPTO_free(void *str)
384         {
385         free_func(str);
386         }
387
388 static unsigned long break_order_num=0;
389 void *CRYPTO_dbg_malloc(int num, const char *file, int line)
390         {
391         char *ret;
392         MEM *m,*mm;
393         APP_INFO tmp,*amim;
394
395         if ((ret=malloc_func(num)) == NULL)
396                 return(NULL);
397
398         if (is_MemCheck_On())
399                 {
400                 MemCheck_off();
401                 if ((m=(MEM *)Malloc(sizeof(MEM))) == NULL)
402                         {
403                         Free(ret);
404                         MemCheck_on();
405                         return(NULL);
406                         }
407                 if (mh == NULL)
408                         {
409                         if ((mh=lh_new(mem_hash,mem_cmp)) == NULL)
410                                 {
411                                 Free(ret);
412                                 Free(m);
413                                 ret=NULL;
414                                 goto err;
415                                 }
416                         }
417
418                 m->addr=ret;
419                 m->file=file;
420                 m->line=line;
421                 m->num=num;
422 #ifdef CRYPTO_MDEBUG_THREAD
423                 m->thread=CRYPTO_thread_id();
424 #endif
425                 if (order == break_order_num)
426                         {
427                         /* BREAK HERE */
428                         m->order=order;
429                         }
430                 m->order=order++;
431 #ifdef CRYPTO_MDEBUG_TIME
432                 m->time=time(NULL);
433 #endif
434
435                 tmp.thread=CRYPTO_thread_id();
436                 m->app_info=NULL;
437                 if (amih != NULL
438                     && (amim=(APP_INFO *)lh_retrieve(amih,(char *)&tmp)) != NULL)
439                         {
440                         m->app_info = amim;
441                         amim->references++;
442                         }
443
444                 if ((mm=(MEM *)lh_insert(mh,(char *)m)) != NULL)
445                         {
446                         /* Not good, but don't sweat it */
447                         if (mm->app_info != NULL)
448                                 {
449                                 mm->app_info->references--;
450                                 }
451                         Free(mm);
452                         }
453 err:
454                 MemCheck_on();
455                 }
456         return(ret);
457         }
458
459 void CRYPTO_dbg_free(void *addr)
460         {
461         MEM m,*mp;
462
463         if (is_MemCheck_On() && (mh != NULL))
464                 {
465                 MemCheck_off();
466
467                 m.addr=addr;
468                 mp=(MEM *)lh_delete(mh,(char *)&m);
469                 if (mp != NULL)
470                         {
471                         if (mp->app_info != NULL)
472                                 {
473                                 mp->app_info->references--;
474                                 }
475                         Free(mp);
476                         }
477
478                 MemCheck_on();
479                 }
480         free_func(addr);
481         }
482
483 void *CRYPTO_dbg_realloc(void *addr, int num, const char *file, int line)
484         {
485         char *ret;
486         MEM m,*mp;
487
488         ret=realloc_func(addr,num);
489         if (ret == addr) return(ret);
490
491         if (is_MemCheck_On())
492                 {
493                 if (ret == NULL) return(NULL);
494
495                 MemCheck_off();
496
497                 m.addr=addr;
498                 mp=(MEM *)lh_delete(mh,(char *)&m);
499                 if (mp != NULL)
500                         {
501                         mp->addr=ret;
502                         lh_insert(mh,(char *)mp);
503                         }
504
505                 MemCheck_on();
506                 }
507         return(ret);
508         }
509
510 void *CRYPTO_remalloc(void *a, int n)
511         {
512         if (a != NULL) Free(a);
513         a=(char *)Malloc(n);
514         return(a);
515         }
516
517 void *CRYPTO_dbg_remalloc(void *a, int n, const char *file, int line)
518         {
519         if (a != NULL) CRYPTO_dbg_free(a);
520         a=(char *)CRYPTO_dbg_malloc(n,file,line);
521         return(a);
522         }
523
524
525 typedef struct mem_leak_st
526         {
527         BIO *bio;
528         int chunks;
529         long bytes;
530         } MEM_LEAK;
531
532 static void print_leak(MEM *m, MEM_LEAK *l)
533         {
534         char buf[128];
535         APP_INFO *amip;
536         int ami_cnt;
537 #ifdef CRYPTO_MDEBUG_TIME
538         struct tm *lcl;
539 #endif
540         unsigned long ti;
541
542         if(m->addr == (char *)l->bio)
543             return;
544
545 #ifdef CRYPTO_MDEBUG_TIME
546         lcl = localtime(&m->time);
547 #endif
548
549         sprintf(buf,
550 #ifdef CRYPTO_MDEBUG_TIME
551                 "[%02d:%02d:%02d] "
552 #endif
553                 "%5lu file=%s, line=%d, "
554 #ifdef CRYPTO_MDEBUG_THREAD
555                 "thread=%lu, "
556 #endif
557                 "number=%d, address=%08lX\n",
558 #ifdef CRYPTO_MDEBUG_TIME
559                 lcl->tm_hour,lcl->tm_min,lcl->tm_sec,
560 #endif
561                 m->order,m->file,m->line,
562 #ifdef CRYPTO_MDEBUG_THREAD
563                 m->thread,
564 #endif
565                 m->num,(unsigned long)m->addr);
566
567         BIO_puts(l->bio,buf);
568         
569         l->chunks++;
570         l->bytes+=m->num;
571
572         amip=m->app_info;
573         ami_cnt=0;
574         if (amip)
575                 ti=amip->thread;
576         while(amip && amip->thread == ti)
577                 {
578                 int buf_len;
579                 int info_len;
580
581                 ami_cnt++;
582                 memset(buf,'>',ami_cnt);
583                 sprintf(buf + ami_cnt,
584                         "thread=%lu, file=%s, line=%d, info=\"",
585                         amip->thread, amip->file, amip->line);
586                 buf_len=strlen(buf);
587                 info_len=strlen(amip->info);
588                 if (128 - buf_len - 3 < info_len)
589                         {
590                         memcpy(buf + buf_len, amip->info, 128 - buf_len - 3);
591                         buf_len = 128 - 3;
592                         }
593                 else
594                         {
595                         strcpy(buf + buf_len, amip->info);
596                         buf_len = strlen(buf);
597                         }
598                 sprintf(buf + buf_len, "\"\n");
599                 
600                 BIO_puts(l->bio,buf);
601
602                 amip = amip->next;
603                 }
604 #ifdef LEVITTE_DEBUG
605         if (amip)
606                 {
607                 fprintf(stderr, "Thread switch detected i backtrace!!!!\n");
608                 abort();
609                 }
610 #endif
611         }
612
613 void CRYPTO_mem_leaks(BIO *b)
614         {
615         MEM_LEAK ml;
616         char buf[80];
617
618         if (mh == NULL) return;
619         ml.bio=b;
620         ml.bytes=0;
621         ml.chunks=0;
622         CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
623         lh_doall_arg(mh,(void (*)())print_leak,(char *)&ml);
624         CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
625         if (ml.chunks != 0)
626                 {
627                 sprintf(buf,"%ld bytes leaked in %d chunks\n",
628                         ml.bytes,ml.chunks);
629                 BIO_puts(b,buf);
630                 }
631
632 #if 0
633         lh_stats_bio(mh,b);
634         lh_node_stats_bio(mh,b);
635         lh_node_usage_stats_bio(mh,b);
636 #endif
637         }
638
639 static void (*mem_cb)()=NULL;
640
641 static void cb_leak(MEM *m, char *cb)
642         {
643         void (*mem_callback)()=(void (*)())cb;
644         mem_callback(m->order,m->file,m->line,m->num,m->addr);
645         }
646
647 void CRYPTO_mem_leaks_cb(void (*cb)())
648         {
649         if (mh == NULL) return;
650         CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
651         mem_cb=cb;
652         lh_doall_arg(mh,(void (*)())cb_leak,(char *)mem_cb);
653         mem_cb=NULL;
654         CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
655         }
656
657 #ifndef NO_FP_API
658 void CRYPTO_mem_leaks_fp(FILE *fp)
659         {
660         BIO *b;
661
662         if (mh == NULL) return;
663         if ((b=BIO_new(BIO_s_file())) == NULL)
664                 return;
665         BIO_set_fp(b,fp,BIO_NOCLOSE);
666         CRYPTO_mem_leaks(b);
667         BIO_free(b);
668         }
669 #endif
670