summaryrefslogtreecommitdiff
path: root/lib/memdebug.c
blob: ede60094bb4c377b1c18bb94469ceb70294463d3 (plain)
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
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "curl_setup.h"

#ifdef CURLDEBUG

#include <curl/curl.h>

#include "urldata.h"

#define MEMDEBUG_NODEFINES /* don't redefine the standard functions */

/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"

/*
 * Until 2011-08-17 libcurl's Memory Tracking feature also performed
 * automatic malloc and free filling operations using 0xA5 and 0x13
 * values. Our own preinitialization of dynamically allocated memory
 * might be useful when not using third party memory debuggers, but
 * on the other hand this would fool memory debuggers into thinking
 * that all dynamically allocated memory is properly initialized.
 *
 * As a default setting, libcurl's Memory Tracking feature no longer
 * performs preinitialization of dynamically allocated memory on its
 * own. If you know what you are doing, and really want to retain old
 * behavior, you can achieve this compiling with preprocessor symbols
 * CURL_MT_MALLOC_FILL and CURL_MT_FREE_FILL defined with appropriate
 * values.
 */

#ifdef CURL_MT_MALLOC_FILL
# if (CURL_MT_MALLOC_FILL < 0) || (CURL_MT_MALLOC_FILL > 0xff)
#   error "invalid CURL_MT_MALLOC_FILL or out of range"
# endif
#endif

#ifdef CURL_MT_FREE_FILL
# if (CURL_MT_FREE_FILL < 0) || (CURL_MT_FREE_FILL > 0xff)
#   error "invalid CURL_MT_FREE_FILL or out of range"
# endif
#endif

#if defined(CURL_MT_MALLOC_FILL) && defined(CURL_MT_FREE_FILL)
# if (CURL_MT_MALLOC_FILL == CURL_MT_FREE_FILL)
#   error "CURL_MT_MALLOC_FILL same as CURL_MT_FREE_FILL"
# endif
#endif

#ifdef CURL_MT_MALLOC_FILL
#  define mt_malloc_fill(buf,len) memset((buf), CURL_MT_MALLOC_FILL, (len))
#else
#  define mt_malloc_fill(buf,len) Curl_nop_stmt
#endif

#ifdef CURL_MT_FREE_FILL
#  define mt_free_fill(buf,len) memset((buf), CURL_MT_FREE_FILL, (len))
#else
#  define mt_free_fill(buf,len) Curl_nop_stmt
#endif

struct memdebug {
  size_t size;
  union {
    curl_off_t o;
    double d;
    void *p;
  } mem[1];
  /* I'm hoping this is the thing with the strictest alignment
   * requirements.  That also means we waste some space :-( */
};

/*
 * Note that these debug functions are very simple and they are meant to
 * remain so. For advanced analysis, record a log file and write perl scripts
 * to analyze them!
 *
 * Don't use these with multithreaded test programs!
 */

FILE *curl_dbg_logfile = NULL;
static bool memlimit = FALSE; /* enable memory limit */
static long memsize = 0;  /* set number of mallocs allowed */

/* this sets the log file name */
void curl_dbg_memdebug(const char *logname)
{
  if(!curl_dbg_logfile) {
    if(logname && *logname)
      curl_dbg_logfile = fopen(logname, FOPEN_WRITETEXT);
    else
      curl_dbg_logfile = stderr;
#ifdef MEMDEBUG_LOG_SYNC
    /* Flush the log file after every line so the log isn't lost in a crash */
    if(curl_dbg_logfile)
      setbuf(curl_dbg_logfile, (char *)NULL);
#endif
  }
}

/* This function sets the number of malloc() calls that should return
   successfully! */
void curl_dbg_memlimit(long limit)
{
  if(!memlimit) {
    memlimit = TRUE;
    memsize = limit;
  }
}

/* returns TRUE if this isn't allowed! */
static bool countcheck(const char *func, int line, const char *source)
{
  /* if source is NULL, then the call is made internally and this check
     should not be made */
  if(memlimit && source) {
    if(!memsize) {
      if(source) {
        /* log to file */
        curl_dbg_log("LIMIT %s:%d %s reached memlimit\n",
                     source, line, func);
        /* log to stderr also */
        fprintf(stderr, "LIMIT %s:%d %s reached memlimit\n",
                source, line, func);
        fflush(curl_dbg_logfile); /* because it might crash now */
      }
      errno = ENOMEM;
      return TRUE; /* RETURN ERROR! */
    }
    else
      memsize--; /* countdown */


  }

  return FALSE; /* allow this */
}

void *curl_dbg_malloc(size_t wantedsize, int line, const char *source)
{
  struct memdebug *mem;
  size_t size;

  DEBUGASSERT(wantedsize != 0);

  if(countcheck("malloc", line, source))
    return NULL;

  /* alloc at least 64 bytes */
  size = sizeof(struct memdebug) + wantedsize;

  mem = (Curl_cmalloc)(size);
  if(mem) {
    /* fill memory with junk */
    mt_malloc_fill(mem->mem, wantedsize);
    mem->size = wantedsize;
  }

  if(source)
    curl_dbg_log("MEM %s:%d malloc(%zu) = %p\n",
                 source, line, wantedsize,
                 mem ? (void *)mem->mem : (void *)0);

  return (mem ? mem->mem : NULL);
}

void *curl_dbg_calloc(size_t wanted_elements, size_t wanted_size,
                      int line, const char *source)
{
  struct memdebug *mem;
  size_t size, user_size;

  DEBUGASSERT(wanted_elements != 0);
  DEBUGASSERT(wanted_size != 0);

  if(countcheck("calloc", line, source))
    return NULL;

  /* alloc at least 64 bytes */
  user_size = wanted_size * wanted_elements;
  size = sizeof(struct memdebug) + user_size;

  mem = (Curl_ccalloc)(1, size);
  if(mem)
    mem->size = user_size;

  if(source)
    curl_dbg_log("MEM %s:%d calloc(%zu,%zu) = %p\n",
                 source, line, wanted_elements, wanted_size,
                 mem ? (void *)mem->mem : (void *)0);

  return (mem ? mem->mem : NULL);
}

char *curl_dbg_strdup(const char *str, int line, const char *source)
{
  char *mem;
  size_t len;

  DEBUGASSERT(str != NULL);

  if(countcheck("strdup", line, source))
    return NULL;

  len = strlen(str) + 1;

  mem = curl_dbg_malloc(len, 0, NULL); /* NULL prevents logging */
  if(mem)
    memcpy(mem, str, len);

  if(source)
    curl_dbg_log("MEM %s:%d strdup(%p) (%zu) = %p\n",
                 source, line, (const void *)str, len, (const void *)mem);

  return mem;
}

#if defined(WIN32) && defined(UNICODE)
wchar_t *curl_dbg_wcsdup(const wchar_t *str, int line, const char *source)
{
  wchar_t *mem;
  size_t wsiz, bsiz;

  DEBUGASSERT(str != NULL);

  if(countcheck("wcsdup", line, source))
    return NULL;

  wsiz = wcslen(str) + 1;
  bsiz = wsiz * sizeof(wchar_t);

  mem = curl_dbg_malloc(bsiz, 0, NULL); /* NULL prevents logging */
  if(mem)
    memcpy(mem, str, bsiz);

  if(source)
    curl_dbg_log("MEM %s:%d wcsdup(%p) (%zu) = %p\n",
                source, line, (void *)str, bsiz, (void *)mem);

  return mem;
}
#endif

/* We provide a realloc() that accepts a NULL as pointer, which then
   performs a malloc(). In order to work with ares. */
void *curl_dbg_realloc(void *ptr, size_t wantedsize,
                      int line, const char *source)
{
  struct memdebug *mem = NULL;

  size_t size = sizeof(struct memdebug) + wantedsize;

  DEBUGASSERT(wantedsize != 0);

  if(countcheck("realloc", line, source))
    return NULL;

#ifdef __INTEL_COMPILER
#  pragma warning(push)
#  pragma warning(disable:1684)
   /* 1684: conversion from pointer to same-sized integral type */
#endif

  if(ptr)
    mem = (void *)((char *)ptr - offsetof(struct memdebug, mem));

#ifdef __INTEL_COMPILER
#  pragma warning(pop)
#endif

  mem = (Curl_crealloc)(mem, size);
  if(source)
    curl_dbg_log("MEM %s:%d realloc(%p, %zu) = %p\n",
                source, line, (void *)ptr, wantedsize,
                mem ? (void *)mem->mem : (void *)0);

  if(mem) {
    mem->size = wantedsize;
    return mem->mem;
  }

  return NULL;
}

void curl_dbg_free(void *ptr, int line, const char *source)
{
  if(ptr) {
    struct memdebug *mem;

#ifdef __INTEL_COMPILER
#  pragma warning(push)
#  pragma warning(disable:1684)
   /* 1684: conversion from pointer to same-sized integral type */
#endif

    mem = (void *)((char *)ptr - offsetof(struct memdebug, mem));

#ifdef __INTEL_COMPILER
#  pragma warning(pop)
#endif

    /* destroy */
    mt_free_fill(mem->mem, mem->size);

    /* free for real */
    (Curl_cfree)(mem);
  }

  if(source)
    curl_dbg_log("MEM %s:%d free(%p)\n", source, line, (void *)ptr);
}

curl_socket_t curl_dbg_socket(int domain, int type, int protocol,
                             int line, const char *source)
{
  const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
    "FD %s:%d socket() = %d\n" :
    (sizeof(curl_socket_t) == sizeof(long)) ?
    "FD %s:%d socket() = %ld\n" :
    "FD %s:%d socket() = %zd\n";

  curl_socket_t sockfd;

  if(countcheck("socket", line, source))
    return CURL_SOCKET_BAD;

  sockfd = socket(domain, type, protocol);

  if(source && (sockfd != CURL_SOCKET_BAD))
    curl_dbg_log(fmt, source, line, sockfd);

  return sockfd;
}

SEND_TYPE_RETV curl_dbg_send(SEND_TYPE_ARG1 sockfd,
                            SEND_QUAL_ARG2 SEND_TYPE_ARG2 buf,
                            SEND_TYPE_ARG3 len, SEND_TYPE_ARG4 flags, int line,
                            const char *source)
{
  SEND_TYPE_RETV rc;
  if(countcheck("send", line, source))
    return -1;
  rc = send(sockfd, buf, len, flags);
  if(source)
    curl_dbg_log("SEND %s:%d send(%lu) = %ld\n",
                source, line, (unsigned long)len, (long)rc);
  return rc;
}

RECV_TYPE_RETV curl_dbg_recv(RECV_TYPE_ARG1 sockfd, RECV_TYPE_ARG2 buf,
                            RECV_TYPE_ARG3 len, RECV_TYPE_ARG4 flags, int line,
                            const char *source)
{
  RECV_TYPE_RETV rc;
  if(countcheck("recv", line, source))
    return -1;
  rc = recv(sockfd, buf, len, flags);
  if(source)
    curl_dbg_log("RECV %s:%d recv(%lu) = %ld\n",
                source, line, (unsigned long)len, (long)rc);
  return rc;
}

#ifdef HAVE_SOCKETPAIR
int curl_dbg_socketpair(int domain, int type, int protocol,
                       curl_socket_t socket_vector[2],
                       int line, const char *source)
{
  const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
    "FD %s:%d socketpair() = %d %d\n" :
    (sizeof(curl_socket_t) == sizeof(long)) ?
    "FD %s:%d socketpair() = %ld %ld\n" :
    "FD %s:%d socketpair() = %zd %zd\n";

  int res = socketpair(domain, type, protocol, socket_vector);

  if(source && (0 == res))
    curl_dbg_log(fmt, source, line, socket_vector[0], socket_vector[1]);

  return res;
}
#endif

curl_socket_t curl_dbg_accept(curl_socket_t s, void *saddr, void *saddrlen,
                             int line, const char *source)
{
  const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
    "FD %s:%d accept() = %d\n" :
    (sizeof(curl_socket_t) == sizeof(long)) ?
    "FD %s:%d accept() = %ld\n" :
    "FD %s:%d accept() = %zd\n";

  struct sockaddr *addr = (struct sockaddr *)saddr;
  curl_socklen_t *addrlen = (curl_socklen_t *)saddrlen;

  curl_socket_t sockfd = accept(s, addr, addrlen);

  if(source && (sockfd != CURL_SOCKET_BAD))
    curl_dbg_log(fmt, source, line, sockfd);

  return sockfd;
}

/* separate function to allow libcurl to mark a "faked" close */
void curl_dbg_mark_sclose(curl_socket_t sockfd, int line, const char *source)
{
  const char *fmt = (sizeof(curl_socket_t) == sizeof(int)) ?
    "FD %s:%d sclose(%d)\n":
    (sizeof(curl_socket_t) == sizeof(long)) ?
    "FD %s:%d sclose(%ld)\n":
    "FD %s:%d sclose(%zd)\n";

  if(source)
    curl_dbg_log(fmt, source, line, sockfd);
}

/* this is our own defined way to close sockets on *ALL* platforms */
int curl_dbg_sclose(curl_socket_t sockfd, int line, const char *source)
{
  int res = sclose(sockfd);
  curl_dbg_mark_sclose(sockfd, line, source);
  return res;
}

FILE *curl_dbg_fopen(const char *file, const char *mode,
                    int line, const char *source)
{
  FILE *res = fopen(file, mode);

  if(source)
    curl_dbg_log("FILE %s:%d fopen(\"%s\",\"%s\") = %p\n",
                source, line, file, mode, (void *)res);

  return res;
}

int curl_dbg_fclose(FILE *file, int line, const char *source)
{
  int res;

  DEBUGASSERT(file != NULL);

  if(source)
    curl_dbg_log("FILE %s:%d fclose(%p)\n",
                 source, line, (void *)file);

  res = fclose(file);

  return res;
}

#define LOGLINE_BUFSIZE  1024

/* this does the writing to the memory tracking log file */
void curl_dbg_log(const char *format, ...)
{
  char *buf;
  int nchars;
  va_list ap;

  if(!curl_dbg_logfile)
    return;

  buf = (Curl_cmalloc)(LOGLINE_BUFSIZE);
  if(!buf)
    return;

  va_start(ap, format);
  nchars = mvsnprintf(buf, LOGLINE_BUFSIZE, format, ap);
  va_end(ap);

  if(nchars > LOGLINE_BUFSIZE - 1)
    nchars = LOGLINE_BUFSIZE - 1;

  if(nchars > 0)
    fwrite(buf, 1, (size_t)nchars, curl_dbg_logfile);

  (Curl_cfree)(buf);
}

#endif /* CURLDEBUG */