summaryrefslogtreecommitdiffstats
path: root/buffer.c
blob: 5ff612380c2c4a9735ae9ad97337126ca71d9f7a (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
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
/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program 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 this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef WIN32
#include "config-win32.h"
#else
#include "config.h"
#endif

#include "syshead.h"

#include "common.h"
#include "buffer.h"
#include "error.h"
#include "mtu.h"
#include "thread.h"

#include "memdbg.h"

struct buffer
#ifdef DMALLOC
alloc_buf_debug (size_t size, const char *file, int line)
#else
alloc_buf (size_t size)
#endif
{
#ifdef DMALLOC
  return alloc_buf_gc_debug (size, NULL, file, line);
#else
  return alloc_buf_gc (size, NULL);
#endif
}

struct buffer
#ifdef DMALLOC
alloc_buf_gc_debug (size_t size, struct gc_arena *gc, const char *file, int line)
#else
alloc_buf_gc (size_t size, struct gc_arena *gc)
#endif
{
  struct buffer buf;
  buf.capacity = (int)size;
  buf.offset = 0;
  buf.len = 0;
#ifdef DMALLOC
  buf.data = (uint8_t *) gc_malloc_debug (size, false, gc, file, line);
#else
  buf.data = (uint8_t *) gc_malloc (size, false, gc);
#endif
  if (size)
    *buf.data = 0;
  return buf;
}

struct buffer
#ifdef DMALLOC
clone_buf_debug (const struct buffer* buf, const char *file, int line)
#else
clone_buf (const struct buffer* buf)
#endif
{
  struct buffer ret;
  ret.capacity = buf->capacity;
  ret.offset = buf->offset;
  ret.len = buf->len;
#ifdef DMALLOC
  ret.data = (uint8_t *) openvpn_dmalloc (file, line, buf->capacity);
#else
  ret.data = (uint8_t *) malloc (buf->capacity);
#endif
  check_malloc_return (ret.data);
  memcpy (BPTR (&ret), BPTR (buf), BLEN (buf));
  return ret;
}

#ifdef BUF_INIT_TRACKING

bool
buf_init_debug (struct buffer *buf, int offset, const char *file, int line)
{
  buf->debug_file = file;
  buf->debug_line = line;
  return buf_init_dowork (buf, offset);
}

static inline int
buf_debug_line (const struct buffer *buf)
{
  return buf->debug_line;
}

static const char *
buf_debug_file (const struct buffer *buf)
{
  return buf->debug_file;
}

#else

#define buf_debug_line(buf) 0
#define buf_debug_file(buf) "[UNDEF]"

#endif

void
buf_clear (struct buffer *buf)
{
  if (buf->capacity > 0)
    memset (buf->data, 0, buf->capacity);
  buf->len = 0;
  buf->offset = 0;
}

bool
buf_assign (struct buffer *dest, const struct buffer *src)
{
  if (!buf_init (dest, src->offset))
    return false;
  return buf_write (dest, BPTR (src), BLEN (src));
}

struct buffer
clear_buf ()
{
  struct buffer buf;
  CLEAR (buf);
  return buf;
}

void
free_buf (struct buffer *buf)
{
  if (buf->data)
    free (buf->data);
  CLEAR (*buf);
}

/*
 * Return a buffer for write that is a subset of another buffer
 */
struct buffer
buf_sub (struct buffer *buf, int size, bool prepend)
{
  struct buffer ret;
  uint8_t *data;

  CLEAR (ret);
  data = prepend ? buf_prepend (buf, size) : buf_write_alloc (buf, size);
  if (data)
    {
      ret.capacity = size;
      ret.data = data;
    }
  return ret;
}

/*
 * printf append to a buffer with overflow check
 */
void
buf_printf (struct buffer *buf, const char *format, ...)
{
  if (buf_defined (buf))
    {
      va_list arglist;
      uint8_t *ptr = BEND (buf);
      int cap = buf_forward_capacity (buf);

      if (cap > 0)
	{
	  va_start (arglist, format);
	  vsnprintf ((char *)ptr, cap, format, arglist);
	  va_end (arglist);
	  *(buf->data + buf->capacity - 1) = 0; /* windows vsnprintf needs this */
	  buf->len += (int) strlen ((char *)ptr);
	}
    }
}

/*
 * This is necessary due to certain buggy implementations of snprintf,
 * that don't guarantee null termination for size > 0.
 */

int openvpn_snprintf(char *str, size_t size, const char *format, ...)
{
  va_list arglist;
  int ret = 0;
  if (size > 0)
    {
      va_start (arglist, format);
      ret = vsnprintf (str, size, format, arglist);
      va_end (arglist);
      str[size - 1] = 0;
    }
  return ret;
}

/*
 * write a string to the end of a buffer that was
 * truncated by buf_printf
 */
void
buf_catrunc (struct buffer *buf, const char *str)
{
  if (buf_forward_capacity (buf) <= 1)
    {
      int len = (int) strlen (str) + 1;
      if (len < buf_forward_capacity_total (buf))
	{
	  strncpynt ((char *)(buf->data + buf->capacity - len), str, len);
	}
    }
}

/*
 * convert a multi-line output to one line
 */
void
convert_to_one_line (struct buffer *buf)
{
  uint8_t *cp = BPTR(buf);
  int len = BLEN(buf);
  while (len--)
    {
      if (*cp == '\n')
	*cp = '|';
      ++cp;
    }
}

/* NOTE: requires that string be null terminated */
void
buf_write_string_file (const struct buffer *buf, const char *filename, int fd)
{
  const int len = strlen ((char *) BPTR (buf));
  const int size = write (fd, BPTR (buf), len);
  if (size != len)
    msg (M_ERR, "Write error on file '%s'", filename);
}

/*
 * Garbage collection
 */

void *
#ifdef DMALLOC
gc_malloc_debug (size_t size, bool clear, struct gc_arena *a, const char *file, int line)
#else
gc_malloc (size_t size, bool clear, struct gc_arena *a)
#endif
{
  void *ret;
  if (a)
    {
      struct gc_entry *e;
#ifdef DMALLOC
      e = (struct gc_entry *) openvpn_dmalloc (file, line, size + sizeof (struct gc_entry));
#else
      e = (struct gc_entry *) malloc (size + sizeof (struct gc_entry));
#endif
      check_malloc_return (e);
      ret = (char *) e + sizeof (struct gc_entry);
      /*mutex_lock_static (L_GC_MALLOC);*/
      e->next = a->list;
      a->list = e;
      /*mutex_unlock_static (L_GC_MALLOC);*/
    }
  else
    {
#ifdef DMALLOC
      ret = openvpn_dmalloc (file, line, size);
#else
      ret = malloc (size);
#endif
      check_malloc_return (ret);
    }
#ifndef ZERO_BUFFER_ON_ALLOC
  if (clear)
#endif
    memset (ret, 0, size);
  return ret;
}

void
x_gc_free (struct gc_arena *a)
{
  struct gc_entry *e;
  /*mutex_lock_static (L_GC_MALLOC);*/
  e = a->list;
  a->list = NULL;
  /*mutex_unlock_static (L_GC_MALLOC);*/
  
  while (e != NULL)
    {
      struct gc_entry *next = e->next;
      free (e);
      e = next;
    }
}

/*
 * Hex dump -- Output a binary buffer to a hex string and return it.
 */

char *
format_hex_ex (const uint8_t *data, int size, int maxoutput,
	       int space_break, const char* separator,
	       struct gc_arena *gc)
{
  struct buffer out = alloc_buf_gc (maxoutput ? maxoutput :
				    ((size * 2) + (size / space_break) * (int) strlen (separator) + 2),
				    gc);
  int i;
  for (i = 0; i < size; ++i)
    {
      if (separator && i && !(i % space_break))
	buf_printf (&out, "%s", separator);
      buf_printf (&out, "%02x", data[i]);
    }
  buf_catrunc (&out, "[more...]");
  return (char *)out.data;
}

/*
 * remove specific trailing character
 */

void
buf_rmtail (struct buffer *buf, uint8_t remove)
{
  uint8_t *cp = BLAST(buf);
  if (cp && *cp == remove)
    {
      *cp = '\0';
      --buf->len;
    }
}

/*
 * force a null termination even it requires
 * truncation of the last char.
 */
void
buf_null_terminate (struct buffer *buf)
{
  char *last = (char *) BLAST (buf);
  if (last && *last == '\0') /* already terminated? */
    return;

  if (!buf_safe (buf, 1))    /* make space for trailing null */
    buf_inc_len (buf, -1);

  buf_write_u8 (buf, 0);
}

/*
 * Remove trailing \r and \n chars and ensure
 * null termination.
 */
void
buf_chomp (struct buffer *buf)
{
  while (true)
    {
      char *last = (char *) BLAST (buf);
      if (!last)
	break;
      if (char_class (*last, CC_CRLF|CC_NULL))
	{
	  if (!buf_inc_len (buf, -1))
	    break;
	}
      else
	break;
    }
  buf_null_terminate (buf);
}

const char *
skip_leading_whitespace (const char *str)
{
  while (*str)
    {
      const char c = *str;
      if (!(c == ' ' || c == '\t'))
	break;
      ++str;
    }
  return str;
}

/*
 * like buf_null_terminate, but operate on strings
 */
void
string_null_terminate (char *str, int len, int capacity)
{
  ASSERT (len >= 0 && len <= capacity && capacity > 0);
  if (len < capacity)
    *(str + len) = '\0';
  else if (len == capacity)
    *(str + len - 1) = '\0';
}

/*
 * Remove trailing \r and \n chars.
 */
void
chomp (char *str)
{
  bool modified;
  do {
    const int len = strlen (str);
    modified = false;
    if (len > 0)
      {
	char *cp = str + (len - 1);
	if (*cp == '\n' || *cp == '\r')
	  {
	    *cp = '\0';
	    modified = true;
	  }
      }
  } while (modified);
}

/*
 * Allocate a string
 */
char *
#ifdef DMALLOC
string_alloc_debug (const char *str, struct gc_arena *gc, const char *file, int line)
#else
string_alloc (const char *str, struct gc_arena *gc)
#endif
{
  if (str)
    {
      const int n = strlen (str) + 1;
      char *ret;

#ifdef DMALLOC
      ret = (char *) gc_malloc_debug (n, false, gc, file, line);
#else
      ret = (char *) gc_malloc (n, false, gc);
#endif
      memcpy (ret, str, n);
      return ret;
    }
  else
    return NULL;
}

/*
 * Erase all characters in a string
 */
void
string_clear (char *str)
{
  if (str)
    {
      const int len = strlen (str);
      if (len > 0)
	memset (str, 0, len);
    }
}

/*
 * Return the length of a string array
 */
int
string_array_len (const char **array)
{
  int i = 0;
  if (array)
    {
      while (array[i])
        ++i;
    }
  return i;
}

char *
print_argv (const char **p, struct gc_arena *gc, const unsigned int flags)
{
  struct buffer out = alloc_buf_gc (256, gc);
  int i = 0;
  for (;;)
    {
      const char *cp = *p++;
      if (!cp)
	break;
      if (i)
	buf_printf (&out, " ");
      if (flags & PA_BRACKET)
	buf_printf (&out, "[%s]", cp);
      else
	buf_printf (&out, "%s", cp);
      ++i;
    }
  return BSTR (&out);
}

/*
 * Allocate a string inside a buffer
 */
struct buffer
#ifdef DMALLOC
string_alloc_buf_debug (const char *str, struct gc_arena *gc, const char *file, int line)
#else
string_alloc_buf (const char *str, struct gc_arena *gc)
#endif
{
  struct buffer buf;

  ASSERT (str);

#ifdef DMALLOC
  buf_set_read (&buf, (uint8_t*) string_alloc_debug (str, gc, file, line), strlen (str) + 1);
#else
  buf_set_read (&buf, (uint8_t*) string_alloc (str, gc), strlen (str) + 1);
#endif

  if (buf.len > 0) /* Don't count trailing '\0' as part of length */
    --buf.len;

  return buf;
}

/*
 * String comparison
 */

bool
buf_string_match_head_str (const struct buffer *src, const char *match)
{
  const int size = strlen (match);
  if (size < 0 || size > src->len)
    return false;
  return memcmp (BPTR (src), match, size) == 0;
}

bool
buf_string_compare_advance (struct buffer *src, const char *match)
{
  if (buf_string_match_head_str (src, match))
    {
      buf_advance (src, strlen (match));
      return true;
    }
  else
    return false;
}

int
buf_substring_len (const struct buffer *buf, int delim)
{
  int i = 0;
  struct buffer tmp = *buf;
  int c;

  while ((c = buf_read_u8 (&tmp)) >= 0)
    {
      ++i;
      if (c == delim)
	return i;
    }
  return -1;
}

/*
 * String parsing
 */

bool
buf_parse (struct buffer *buf, const int delim, char *line, const int size)
{
  bool eol = false;
  int n = 0;
  int c;

  ASSERT (size > 0);

  do
    {
      c = buf_read_u8 (buf);
      if (c < 0)
	eol = true;
      if (c <= 0 || c == delim)
	c = 0;
      if (n >= size)
	break;
      line[n++] = c;
    }
  while (c);

  line[size-1] = '\0';
  return !(eol && !strlen (line));
}

/*
 * Classify and mutate strings based on character types.
 */

bool
char_class (const char c, const unsigned int flags)
{
  if (!flags)
    return false;
  if (flags & CC_ANY)
    return true;

  if ((flags & CC_NULL) && c == '\0')
    return true;

  if ((flags & CC_ALNUM) && isalnum (c))
    return true;
  if ((flags & CC_ALPHA) && isalpha (c))
    return true;
  if ((flags & CC_ASCII) && isascii (c))
    return true;
  if ((flags & CC_CNTRL) && iscntrl (c))
    return true;
  if ((flags & CC_DIGIT) && isdigit (c))
    return true;
  if ((flags & CC_PRINT) && isprint (c))
    return true;
  if ((flags & CC_PUNCT) && ispunct (c))
    return true;    
  if ((flags & CC_SPACE) && isspace (c))
    return true;
  if ((flags & CC_XDIGIT) && isxdigit (c))
    return true;

  if ((flags & CC_BLANK) && (c == ' ' || c == '\t'))
    return true;
  if ((flags & CC_NEWLINE) && c == '\n')
    return true;
  if ((flags & CC_CR) && c == '\r')
    return true;

  if ((flags & CC_BACKSLASH) && c == '\\')
    return true;
  if ((flags & CC_UNDERBAR) && c == '_')
    return true;
  if ((flags & CC_DASH) && c == '-')
    return true;
  if ((flags & CC_DOT) && c == '.')
    return true;
  if ((flags & CC_COMMA) && c == ',')
    return true;
  if ((flags & CC_COLON) && c == ':')
    return true;
  if ((flags & CC_SLASH) && c == '/')
    return true;
  if ((flags & CC_SINGLE_QUOTE) && c == '\'')
    return true;
  if ((flags & CC_DOUBLE_QUOTE) && c == '\"')
    return true;
  if ((flags & CC_REVERSE_QUOTE) && c == '`')
    return true;
  if ((flags & CC_AT) && c == '@')
    return true;
  if ((flags & CC_EQUAL) && c == '=')
    return true;

  return false;
}

static inline bool
char_inc_exc (const char c, const unsigned int inclusive, const unsigned int exclusive)
{
  return char_class (c, inclusive) && !char_class (c, exclusive);
}

bool
string_class (const char *str, const unsigned int inclusive, const unsigned int exclusive)
{
  char c;
  ASSERT (str);
  while ((c = *str++))
    {
      if (!char_inc_exc (c, inclusive, exclusive))
	return false;
    }
  return true;
}

/*
 * Modify string in place.
 * Guaranteed to not increase string length.
 */
bool
string_mod (char *str, const unsigned int inclusive, const unsigned int exclusive, const char replace)
{
  const char *in = str;
  bool ret = true;

  ASSERT (str);

  while (true)
    {
      char c = *in++;
      if (c)
	{
	  if (!char_inc_exc (c, inclusive, exclusive))
	    {
	      c = replace;
	      ret = false;
	    }
	  if (c)
	    *str++ = c;
	}
      else
	{
	  *str = '\0';
	  break;
	}
    }
  return ret;
}

const char *
string_mod_const (const char *str,
		  const unsigned int inclusive,
		  const unsigned int exclusive,
		  const char replace,
		  struct gc_arena *gc)
{
  if (str)
    {
      char *buf = string_alloc (str, gc);
      string_mod (buf, inclusive, exclusive, replace);
      return buf;
    }
  else
    return NULL;
}

#ifdef CHARACTER_CLASS_DEBUG

#define CC_INCLUDE    (CC_PRINT)
#define CC_EXCLUDE    (0)
#define CC_REPLACE    ('.')

void
character_class_debug (void)
{
  char buf[256];

  while (fgets (buf, sizeof (buf), stdin) != NULL)
    {
      string_mod (buf, CC_INCLUDE, CC_EXCLUDE, CC_REPLACE);
      printf ("%s", buf);
    }
}

#endif

#ifdef VERIFY_ALIGNMENT
void
valign4 (const struct buffer *buf, const char *file, const int line)
{
  if (buf && buf->len)
    {
      int msglevel = D_ALIGN_DEBUG;
      const unsigned int u = (unsigned int) BPTR (buf);

      if (u & (PAYLOAD_ALIGN-1))
	msglevel = D_ALIGN_ERRORS;

      msg (msglevel, "%sAlignment at %s/%d ptr=" ptr_format " OLC=%d/%d/%d I=%s/%d",
	   (msglevel == D_ALIGN_ERRORS) ? "ERROR: " : "",
	   file,
	   line,
	   (ptr_type)buf->data,
	   buf->offset,
	   buf->len,
	   buf->capacity,
	   buf_debug_file (buf),
	   buf_debug_line (buf));
    }
}
#endif