summaryrefslogtreecommitdiff
path: root/lib/util/util_str.c
blob: afa772a8a81c3b33ed8c9b63346cbb5b97d1c9f9 (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
/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   
   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) Simo Sorce      2001-2002
   Copyright (C) Martin Pool     2003
   Copyright (C) James Peach	 2005
   
   This program 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 3 of the License, or
   (at your option) any later version.
   
   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.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "libcli/raw/smb.h"
#include "system/locale.h"

/**
 * @file
 * @brief String utilities.
 **/


/**
 Trim the specified elements off the front and back of a string.
**/
_PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
{
	bool ret = false;
	size_t front_len;
	size_t back_len;
	size_t len;

	/* Ignore null or empty strings. */
	if (!s || (s[0] == '\0'))
		return false;

	front_len	= front? strlen(front) : 0;
	back_len	= back? strlen(back) : 0;

	len = strlen(s);

	if (front_len) {
		while (len && strncmp(s, front, front_len)==0) {
			/* Must use memmove here as src & dest can
			 * easily overlap. Found by valgrind. JRA. */
			memmove(s, s+front_len, (len-front_len)+1);
			len -= front_len;
			ret=true;
		}
	}
	
	if (back_len) {
		while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
			s[len-back_len]='\0';
			len -= back_len;
			ret=true;
		}
	}
	return ret;
}

/**
 Find the number of 'c' chars in a string
**/
_PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
{
	size_t count = 0;

	while (*s) {
		if (*s == c) count++;
		s ++;
	}

	return count;
}



/**
 Safe string copy into a known length string. maxlength does not
 include the terminating zero.
**/
_PUBLIC_ char *safe_strcpy(char *dest,const char *src, size_t maxlength)
{
	size_t len;

	if (!dest) {
		DEBUG(0,("ERROR: NULL dest in safe_strcpy\n"));
		return NULL;
	}

#ifdef DEVELOPER
	/* We intentionally write out at the extremity of the destination
	 * string.  If the destination is too short (e.g. pstrcpy into mallocd
	 * or fstring) then this should cause an error under a memory
	 * checker. */
	dest[maxlength] = '\0';
	if (PTR_DIFF(&len, dest) > 0) {  /* check if destination is on the stack, ok if so */
		log_suspicious_usage("safe_strcpy", src);
	}
#endif

	if (!src) {
		*dest = 0;
		return dest;
	}  

	len = strlen(src);

	if (len > maxlength) {
		DEBUG(0,("ERROR: string overflow by %u (%u - %u) in safe_strcpy [%.50s]\n",
			 (uint_t)(len-maxlength), (unsigned)len, (unsigned)maxlength, src));
		len = maxlength;
	}
      
	memmove(dest, src, len);
	dest[len] = 0;
	return dest;
}  

/**
 Safe string cat into a string. maxlength does not
 include the terminating zero.
**/
_PUBLIC_ char *safe_strcat(char *dest, const char *src, size_t maxlength)
{
	size_t src_len, dest_len;

	if (!dest) {
		DEBUG(0,("ERROR: NULL dest in safe_strcat\n"));
		return NULL;
	}

	if (!src)
		return dest;
	
#ifdef DEVELOPER
	if (PTR_DIFF(&src_len, dest) > 0) {  /* check if destination is on the stack, ok if so */
		log_suspicious_usage("safe_strcat", src);
	}
#endif
	src_len = strlen(src);
	dest_len = strlen(dest);

	if (src_len + dest_len > maxlength) {
		DEBUG(0,("ERROR: string overflow by %d in safe_strcat [%.50s]\n",
			 (int)(src_len + dest_len - maxlength), src));
		if (maxlength > dest_len) {
			memcpy(&dest[dest_len], src, maxlength - dest_len);
		}
		dest[maxlength] = 0;
		return NULL;
	}
	
	memcpy(&dest[dest_len], src, src_len);
	dest[dest_len + src_len] = 0;
	return dest;
}

/**
 Routine to get hex characters and turn them into a 16 byte array.
 the array can be variable length, and any non-hex-numeric
 characters are skipped.  "0xnn" or "0Xnn" is specially catered
 for.

 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"


**/
_PUBLIC_ size_t strhex_to_str(char *p, size_t len, const char *strhex)
{
	size_t i;
	size_t num_chars = 0;
	uint8_t   lonybble, hinybble;
	const char     *hexchars = "0123456789ABCDEF";
	char           *p1 = NULL, *p2 = NULL;

	for (i = 0; i < len && strhex[i] != 0; i++) {
		if (strncasecmp(hexchars, "0x", 2) == 0) {
			i++; /* skip two chars */
			continue;
		}

		if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
			break;

		i++; /* next hex digit */

		if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
			break;

		/* get the two nybbles */
		hinybble = PTR_DIFF(p1, hexchars);
		lonybble = PTR_DIFF(p2, hexchars);

		p[num_chars] = (hinybble << 4) | lonybble;
		num_chars++;

		p1 = NULL;
		p2 = NULL;
	}
	return num_chars;
}

/** 
 * Parse a hex string and return a data blob. 
 */
_PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex) 
{
	DATA_BLOB ret_blob = data_blob(mem_ctx, strlen(strhex)/2+1);

	ret_blob.length = strhex_to_str((char *)ret_blob.data, 	
					strlen(strhex), 
					strhex);

	return ret_blob;
}


/**
 * Routine to print a buffer as HEX digits, into an allocated string.
 */
_PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
{
	int i;
	char *hex_buffer;

	*out_hex_buffer = malloc_array_p(char, (len*2)+1);
	hex_buffer = *out_hex_buffer;

	for (i = 0; i < len; i++)
		slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
}

/**
 * talloc version of hex_encode()
 */
_PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
{
	int i;
	char *hex_buffer;

	hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);

	for (i = 0; i < len; i++)
		slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);

	return hex_buffer;
}

/**
 Unescape a URL encoded string, in place.
**/

_PUBLIC_ void rfc1738_unescape(char *buf)
{
	char *p=buf;

	while ((p=strchr(p,'+')))
		*p = ' ';

	p = buf;

	while (p && *p && (p=strchr(p,'%'))) {
		int c1 = p[1];
		int c2 = p[2];

		if (c1 >= '0' && c1 <= '9')
			c1 = c1 - '0';
		else if (c1 >= 'A' && c1 <= 'F')
			c1 = 10 + c1 - 'A';
		else if (c1 >= 'a' && c1 <= 'f')
			c1 = 10 + c1 - 'a';
		else {p++; continue;}

		if (c2 >= '0' && c2 <= '9')
			c2 = c2 - '0';
		else if (c2 >= 'A' && c2 <= 'F')
			c2 = 10 + c2 - 'A';
		else if (c2 >= 'a' && c2 <= 'f')
			c2 = 10 + c2 - 'a';
		else {p++; continue;}
			
		*p = (c1<<4) | c2;

		memmove(p+1, p+3, strlen(p+3)+1);
		p++;
	}
}

#ifdef VALGRIND
size_t valgrind_strlen(const char *s)
{
	size_t count;
	for(count = 0; *s++; count++)
		;
	return count;
}
#endif


/**
  format a string into length-prefixed dotted domain format, as used in NBT
  and in some ADS structures
**/
_PUBLIC_ const char *str_format_nbt_domain(TALLOC_CTX *mem_ctx, const char *s)
{
	char *ret;
	int i;
	if (!s || !*s) {
		return talloc_strdup(mem_ctx, "");
	}
	ret = talloc_array(mem_ctx, char, strlen(s)+2);
	if (!ret) {
		return ret;
	}
	
	memcpy(ret+1, s, strlen(s)+1);
	ret[0] = '.';

	for (i=0;ret[i];i++) {
		if (ret[i] == '.') {
			char *p = strchr(ret+i+1, '.');
			if (p) {
				ret[i] = p-(ret+i+1);
			} else {
				ret[i] = strlen(ret+i+1);
			}
		}
	}

	return ret;
}

/**
 * Add a string to an array of strings.
 *
 * num should be a pointer to an integer that holds the current 
 * number of elements in strings. It will be updated by this function.
 */
_PUBLIC_ bool add_string_to_array(TALLOC_CTX *mem_ctx,
			 const char *str, const char ***strings, int *num)
{
	char *dup_str = talloc_strdup(mem_ctx, str);

	*strings = talloc_realloc(mem_ctx,
				    *strings,
				    const char *, ((*num)+1));

	if ((*strings == NULL) || (dup_str == NULL))
		return false;

	(*strings)[*num] = dup_str;
	*num += 1;

	return true;
}



/**
  varient of strcmp() that handles NULL ptrs
**/
_PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
{
	if (s1 == s2) {
		return 0;
	}
	if (s1 == NULL || s2 == NULL) {
		return s1?-1:1;
	}
	return strcmp(s1, s2);
}


/**
return the number of bytes occupied by a buffer in ASCII format
the result includes the null termination
limited by 'n' bytes
**/
_PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
{
	size_t len;

	len = strnlen(src, n);
	if (len+1 <= n) {
		len += 1;
	}

	return len;
}


/**
 Return a string representing a CIFS attribute for a file.
**/
_PUBLIC_ char *attrib_string(TALLOC_CTX *mem_ctx, uint32_t attrib)
{
	int i, len;
	const struct {
		char c;
		uint16_t attr;
	} attr_strs[] = {
		{'V', FILE_ATTRIBUTE_VOLUME},
		{'D', FILE_ATTRIBUTE_DIRECTORY},
		{'A', FILE_ATTRIBUTE_ARCHIVE},
		{'H', FILE_ATTRIBUTE_HIDDEN},
		{'S', FILE_ATTRIBUTE_SYSTEM},
		{'N', FILE_ATTRIBUTE_NORMAL},
		{'R', FILE_ATTRIBUTE_READONLY},
		{'d', FILE_ATTRIBUTE_DEVICE},
		{'t', FILE_ATTRIBUTE_TEMPORARY},
		{'s', FILE_ATTRIBUTE_SPARSE},
		{'r', FILE_ATTRIBUTE_REPARSE_POINT},
		{'c', FILE_ATTRIBUTE_COMPRESSED},
		{'o', FILE_ATTRIBUTE_OFFLINE},
		{'n', FILE_ATTRIBUTE_NONINDEXED},
		{'e', FILE_ATTRIBUTE_ENCRYPTED}
	};
	char *ret;

	ret = talloc_array(mem_ctx, char, ARRAY_SIZE(attr_strs)+1);
	if (!ret) {
		return NULL;
	}

	for (len=i=0; i<ARRAY_SIZE(attr_strs); i++) {
		if (attrib & attr_strs[i].attr) {
			ret[len++] = attr_strs[i].c;
		}
	}

	ret[len] = 0;

	return ret;
}

/**
 Set a boolean variable from the text value stored in the passed string.
 Returns true in success, false if the passed string does not correctly 
 represent a boolean.
**/

_PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
{
	if (strwicmp(boolean_string, "yes") == 0 ||
	    strwicmp(boolean_string, "true") == 0 ||
	    strwicmp(boolean_string, "on") == 0 ||
	    strwicmp(boolean_string, "1") == 0) {
		*boolean = true;
		return true;
	} else if (strwicmp(boolean_string, "no") == 0 ||
		   strwicmp(boolean_string, "false") == 0 ||
		   strwicmp(boolean_string, "off") == 0 ||
		   strwicmp(boolean_string, "0") == 0) {
		*boolean = false;
		return true;
	}
	return false;
}

/**
 * Parse a string containing a boolean value.
 *
 * val will be set to the read value.
 *
 * @retval true if a boolean value was parsed, false otherwise.
 */
_PUBLIC_ bool conv_str_bool(const char * str, bool * val)
{
	char *	end = NULL;
	long	lval;

	if (str == NULL || *str == '\0') {
		return false;
	}

	lval = strtol(str, &end, 10 /* base */);
	if (end == NULL || *end != '\0' || end == str) {
		return set_boolean(str, val);
	}

	*val = (lval) ? true : false;
	return true;
}

/**
 * Convert a size specification like 16K into an integral number of bytes. 
 **/
_PUBLIC_ bool conv_str_size(const char * str, uint64_t * val)
{
	char *		    end = NULL;
	unsigned long long  lval;

	if (str == NULL || *str == '\0') {
		return false;
	}

	lval = strtoull(str, &end, 10 /* base */);
	if (end == NULL || end == str) {
		return false;
	}

	if (*end) {
		if (strwicmp(end, "K") == 0) {
			lval *= 1024ULL;
		} else if (strwicmp(end, "M") == 0) {
			lval *= (1024ULL * 1024ULL);
		} else if (strwicmp(end, "G") == 0) {
			lval *= (1024ULL * 1024ULL * 1024ULL);
		} else if (strwicmp(end, "T") == 0) {
			lval *= (1024ULL * 1024ULL * 1024ULL * 1024ULL);
		} else if (strwicmp(end, "P") == 0) {
			lval *= (1024ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL);
		} else {
			return false;
		}
	}

	*val = (uint64_t)lval;
	return true;
}

/**
 * Parse a uint64_t value from a string
 *
 * val will be set to the value read.
 *
 * @retval true if parsing was successful, false otherwise
 */
_PUBLIC_ bool conv_str_u64(const char * str, uint64_t * val)
{
	char *		    end = NULL;
	unsigned long long  lval;

	if (str == NULL || *str == '\0') {
		return false;
	}

	lval = strtoull(str, &end, 10 /* base */);
	if (end == NULL || *end != '\0' || end == str) {
		return false;
	}

	*val = (uint64_t)lval;
	return true;
}

/**
return the number of bytes occupied by a buffer in CH_UTF16 format
the result includes the null termination
**/
_PUBLIC_ size_t utf16_len(const void *buf)
{
	size_t len;

	for (len = 0; SVAL(buf,len); len += 2) ;

	return len + 2;
}

/**
return the number of bytes occupied by a buffer in CH_UTF16 format
the result includes the null termination
limited by 'n' bytes
**/
_PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
{
	size_t len;

	for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;

	if (len+2 <= n) {
		len += 2;
	}

	return len;
}

_PUBLIC_ size_t ucs2_align(const void *base_ptr, const void *p, int flags)
{
	if (flags & (STR_NOALIGN|STR_ASCII))
		return 0;
	return PTR_DIFF(p, base_ptr) & 1;
}

/**
Do a case-insensitive, whitespace-ignoring string compare.
**/
_PUBLIC_ int strwicmp(const char *psz1, const char *psz2)
{
	/* if BOTH strings are NULL, return TRUE, if ONE is NULL return */
	/* appropriate value. */
	if (psz1 == psz2)
		return (0);
	else if (psz1 == NULL)
		return (-1);
	else if (psz2 == NULL)
		return (1);

	/* sync the strings on first non-whitespace */
	while (1) {
		while (isspace((int)*psz1))
			psz1++;
		while (isspace((int)*psz2))
			psz2++;
		if (toupper((unsigned char)*psz1) != toupper((unsigned char)*psz2) 
		    || *psz1 == '\0'
		    || *psz2 == '\0')
			break;
		psz1++;
		psz2++;
	}
	return (*psz1 - *psz2);
}

/**
 String replace.
**/
_PUBLIC_ void string_replace(char *s, char oldc, char newc)
{
	while (*s) {
		if (*s == oldc) *s = newc;
		s++;
	}
}

/**
 * Compare 2 strings.
 *
 * @note The comparison is case-insensitive.
 **/
_PUBLIC_ bool strequal(const char *s1, const char *s2)
{
	if (s1 == s2)
		return true;
	if (!s1 || !s2)
		return false;
  
	return strcasecmp(s1,s2) == 0;
}