summaryrefslogtreecommitdiff
path: root/src/include/gnunet_strings_lib.h
blob: 8d829d42e12cc74b87ebe047a44fc0df449c8644 (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
/*
     This file is part of GNUnet.
     Copyright (C) 2001-2013 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet 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
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @author Christian Grothoff
 * @author Krista Bennett
 * @author Gerd Knorr <kraxel@bytesex.org>
 * @author Ioana Patrascu
 * @author Tzvetan Horozov
 *
 * @file
 * Strings and string handling functions
 *
 * @defgroup strings  Strings library
 * Strings and string handling functions, including malloc and string tokenizing.
 * @{
 */

#ifndef GNUNET_STRINGS_LIB_H
#define GNUNET_STRINGS_LIB_H

/* we need size_t, and since it can be both unsigned int
   or unsigned long long, this IS platform dependent;
   but "stdlib.h" should be portable 'enough' to be
   unconditionally available... */
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>

#ifdef __cplusplus
extern "C"
{
#if 0                           /* keep Emacsens' auto-indent happy */
}
#endif
#endif

#include "gnunet_time_lib.h"


/**
 * Convert a given fancy human-readable size to bytes.
 *
 * @param fancy_size human readable string (i.e. 1 MB)
 * @param size set to the size in bytes
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_size_to_bytes (const char *fancy_size,
                                    unsigned long long *size);


/**
 * Convert a given fancy human-readable time to our internal
 * representation.
 *
 * @param fancy_time human readable string (i.e. 1 minute)
 * @param rtime set to the relative time
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_time_to_relative (const char *fancy_time,
                                       struct GNUNET_TIME_Relative *rtime);


/**
 * @ingroup time
 * Convert a given fancy human-readable time to our internal
 * representation.  The human-readable time is expected to be
 * in local time, whereas the returned value will be in UTC.
 *
 * @param fancy_time human readable string (i.e. %Y-%m-%d %H:%M:%S)
 * @param atime set to the absolute time
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_time_to_absolute (const char *fancy_time,
                                       struct GNUNET_TIME_Absolute *atime);


/**
 * Convert a given filesize into a fancy human-readable format.
 *
 * @param size number of bytes
 * @return fancy representation of the size (possibly rounded) for humans
 */
char *
GNUNET_STRINGS_byte_size_fancy (unsigned long long size);


/**
 * Convert the len characters long character sequence
 * given in input that is in the given input charset
 * to a string in given output charset.
 *
 * @param input input string
 * @param len number of bytes in @a input
 * @param input_charset character set used for @a input
 * @param output_charset desired character set for the return value
 * @return the converted string (0-terminated),
 *  if conversion fails, a copy of the orignal
 *  string is returned.
 */
char *
GNUNET_STRINGS_conv (const char *input,
                     size_t len,
                     const char *input_charset,
                     const char *output_charset);


/**
 * Convert the len characters long character sequence
 * given in input that is in the given charset
 * to UTF-8.
 *
 * @param input the input string (not necessarily 0-terminated)
 * @param len the number of bytes in the @a input
 * @param charset character set to convert from
 * @return the converted string (0-terminated)
 */
char *
GNUNET_STRINGS_to_utf8 (const char *input,
                        size_t len,
                        const char *charset);


/**
 * Convert the len bytes-long UTF-8 string
 * given in input to the given charset.
 *
 * @param input the input string (not necessarily 0-terminated)
 * @param len the number of bytes in the @a input
 * @param charset character set to convert to
 * @return the converted string (0-terminated),
 *  if conversion fails, a copy of the orignal
 *  string is returned.
 */
char *
GNUNET_STRINGS_from_utf8 (const char *input,
                          size_t len,
                          const char *charset);


/**
 * Convert the utf-8 input string to lower case.
 * Output needs to be allocated appropriately.
 *
 * @param input input string
 * @param output output buffer
 */
void
GNUNET_STRINGS_utf8_tolower (const char *input,
                             char *output);


/**
 * Convert the utf-8 input string to upper case.
 * Output needs to be allocated appropriately.
 *
 * @param input input string
 * @param output output buffer
 */
void
GNUNET_STRINGS_utf8_toupper (const char *input,
                             char *output);


/**
 * Complete filename (a la shell) from abbrevition.
 *
 * @param fil the name of the file, may contain ~/ or
 *        be relative to the current directory
 * @return the full file name,
 *          NULL is returned on error
 */
char *
GNUNET_STRINGS_filename_expand (const char *fil);


/**
 * Fill a buffer of the given size with count 0-terminated strings
 * (given as varargs).  If "buffer" is NULL, only compute the amount
 * of space required (sum of "strlen(arg)+1").
 *
 * Unlike using "snprintf" with "%s", this function will add
 * 0-terminators after each string.  The
 * "GNUNET_string_buffer_tokenize" function can be used to parse the
 * buffer back into individual strings.
 *
 * @param buffer the buffer to fill with strings, can
 *               be NULL in which case only the necessary
 *               amount of space will be calculated
 * @param size number of bytes available in buffer
 * @param count number of strings that follow
 * @param ... count 0-terminated strings to copy to buffer
 * @return number of bytes written to the buffer
 *         (or number of bytes that would have been written)
 */
size_t
GNUNET_STRINGS_buffer_fill (char *buffer,
                            size_t size,
                            unsigned int count,
                            ...);


/**
 * Given a buffer of a given size, find "count" 0-terminated strings
 * in the buffer and assign the count (varargs) of type "const char**"
 * to the locations of the respective strings in the buffer.
 *
 * @param buffer the buffer to parse
 * @param size size of the @a buffer
 * @param count number of strings to locate
 * @param ... pointers to where to store the strings
 * @return offset of the character after the last 0-termination
 *         in the buffer, or 0 on error.
 */
unsigned int
GNUNET_STRINGS_buffer_tokenize (const char *buffer,
                                size_t size,
                                unsigned int count, ...);


/**
 * @ingroup time
 * Like `asctime`, except for GNUnet time.  Converts a GNUnet internal
 * absolute time (which is in UTC) to a string in local time.
 * Note that the returned value will be overwritten if this function
 * is called again.
 *
 * @param t the absolute time to convert
 * @return timestamp in human-readable form in local time
 */
const char *
GNUNET_STRINGS_absolute_time_to_string (struct GNUNET_TIME_Absolute t);


/**
 * @ingroup time
 * Give relative time in human-readable fancy format.
 * This is one of the very few calls in the entire API that is
 * NOT reentrant!
 *
 * @param delta time in milli seconds
 * @param do_round are we allowed to round a bit?
 * @return string in human-readable form
 */
const char *
GNUNET_STRINGS_relative_time_to_string (struct GNUNET_TIME_Relative delta,
                                        int do_round);


/**
 * "man basename"
 * Returns a pointer to a part of filename (allocates nothing)!
 *
 * @param filename filename to extract basename from
 * @return short (base) name of the file (that is, everything following the
 *         last directory separator in filename. If filename ends with a
 *         directory separator, the result will be a zero-length string.
 *         If filename has no directory separators, the result is filename
 *         itself.
 */
const char *
GNUNET_STRINGS_get_short_name (const char *filename);


/**
 * Convert binary data to ASCII encoding using CrockfordBase32.
 * Does not append 0-terminator, but returns a pointer to the place where
 * it should be placed, if needed.
 *
 * @param data data to encode
 * @param size size of data (in bytes)
 * @param out buffer to fill
 * @param out_size size of the buffer. Must be large enough to hold
 * ((size*8) + (((size*8) % 5) > 0 ? 5 - ((size*8) % 5) : 0)) / 5
 * @return pointer to the next byte in 'out' or NULL on error.
 */
char *
GNUNET_STRINGS_data_to_string (const void *data,
                               size_t size,
                               char *out,
                               size_t out_size);


/**
 * Return the base32crockford encoding of the given buffer.
 *
 * The returned string will be freshly allocated, and must be free'd
 * with #GNUNET_free().
 *
 * @param buf buffer with data
 * @param size size of the buffer @a buf
 * @return freshly allocated, null-terminated string
 */
char *
GNUNET_STRINGS_data_to_string_alloc (const void *buf,
                                     size_t size);


/**
 * Convert CrockfordBase32 encoding back to data.
 * @a out_size must match exactly the size of the data before it was encoded.
 *
 * @param enc the encoding
 * @param enclen number of characters in @a enc (without 0-terminator, which can be missing)
 * @param out location where to store the decoded data
 * @param out_size size of the output buffer @a out
 * @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
 */
int
GNUNET_STRINGS_string_to_data (const char *enc,
                               size_t enclen,
                               void *out,
                               size_t out_size);


/**
 * Encode into Base64.
 *
 * @param data the data to encode
 * @param len the length of the input
 * @param output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_base64_encode (const void *in,
                              size_t len,
                              char **output);


/**
 * url/percent encode (RFC3986).
 *
 * @param data the data to decode
 * @param len the length of the input
 * @param output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_urlencode (const char *data, size_t len, char **out);

/**
 * Encode into Base64url. RFC7515
 *
 * @param in the data to encode
 * @param len the length of the input
 * @param output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_base64url_encode (const void *in, size_t len, char **output);


/**
 * Decode from Base64.
 *
 * @param data the data to encode
 * @param len the length of the input
 * @param[out] output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_base64_decode (const char *data,
                              size_t len,
                              void **output);


/**
 * Decode from Base64url. RFC7515
 *
 * @param data the data to decode
 * @param len the length of the input
 * @param output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_base64url_decode (const char *data, size_t len, void **out);

/**
 * url/percent encode (RFC3986).
 *
 * @param data the data to encode
 * @param len the length of the input
 * @param output where to write the output (*output should be NULL,
 *   is allocated)
 * @return the size of the output
 */
size_t
GNUNET_STRINGS_urldecode (const char *data, size_t len, char **out);


/**
 * Convert a peer path to a human-readable string.
 *
 * @param pids array of PIDs to convert to a string
 * @param num_pids length of the @a pids array
 * @return string representing the array of @a pids
 */
char *
GNUNET_STRINGS_pp2s (const struct GNUNET_PeerIdentity *pids,
                     unsigned int num_pids);


/**
 * Parse a path that might be an URI.
 *
 * @param path path to parse. Must be NULL-terminated.
 * @param[out] scheme_part pointer to a string that
 *        represents the URI scheme will be stored. Can be NULL. The string is
 *        allocated by the function, and should be freed by GNUNET_free() when
 *        it is no longer needed.
 * @param path_part a pointer to 'const char *' where a pointer to the path
 *        part of the URI will be stored. Can be NULL. Points to the same block
 *        of memory as @a path, and thus must not be freed. Might point to '\0',
 *        if path part is zero-length.
 * @return #GNUNET_YES if it's an URI, #GNUNET_NO otherwise. If 'path' is not
 *         an URI, '* scheme_part' and '*path_part' will remain unchanged
 *         (if they weren't NULL).
 */
int
GNUNET_STRINGS_parse_uri (const char *path,
                          char **scheme_part,
                          const char **path_part);


/**
 * Check whether filename is absolute or not, and if it's an URI
 *
 * @param filename filename to check
 * @param can_be_uri #GNUNET_YES to check for being URI, #GNUNET_NO - to
 *        assume it's not URI
 * @param r_is_uri a pointer to an int that is set to #GNUNET_YES if 'filename'
 *        is URI and to GNUNET_NO otherwise. Can be NULL. If 'can_be_uri' is
 *        not #GNUNET_YES, *r_is_uri is set to #GNUNET_NO.
 * @param r_uri_scheme a pointer to a char * that is set to a pointer to URI scheme.
 *        The string is allocated by the function, and should be freed with
 *        GNUNET_free (). Can be NULL.
 * @return #GNUNET_YES if 'filename' is absolute, #GNUNET_NO otherwise.
 */
int
GNUNET_STRINGS_path_is_absolute (const char *filename,
                                 int can_be_uri,
                                 int *r_is_uri,
                                 char **r_uri_scheme);


/**
 * Flags for what we should check a file for.
 */
enum GNUNET_STRINGS_FilenameCheck
{
  /**
   * Check that it exists.
   */
  GNUNET_STRINGS_CHECK_EXISTS = 0x00000001,

  /**
   * Check that it is a directory.
   */
  GNUNET_STRINGS_CHECK_IS_DIRECTORY = 0x00000002,

  /**
   * Check that it is a link.
   */
  GNUNET_STRINGS_CHECK_IS_LINK = 0x00000004,

  /**
   * Check that the path is an absolute path.
   */
  GNUNET_STRINGS_CHECK_IS_ABSOLUTE = 0x00000008
};


/**
 * Perform checks on @a filename.  FIXME: some duplication with
 * "GNUNET_DISK_"-APIs.  We should unify those.
 *
 * @param filename file to check
 * @param checks checks to perform
 * @return #GNUNET_YES if all checks pass, #GNUNET_NO if at least one of them
 *         fails, #GNUNET_SYSERR when a check can't be performed
 */
int
GNUNET_STRINGS_check_filename (const char *filename,
                               enum GNUNET_STRINGS_FilenameCheck checks);


/**
 * Tries to convert @a zt_addr string to an IPv6 address.
 * The string is expected to have the format "[ABCD::01]:80".
 *
 * @param zt_addr 0-terminated string. May be mangled by the function.
 * @param addrlen length of zt_addr (not counting 0-terminator).
 * @param r_buf a buffer to fill. Initially gets filled with zeroes,
 *        then its sin6_port, sin6_family and sin6_addr are set appropriately.
 * @return #GNUNET_OK if conversion succeded. #GNUNET_SYSERR otherwise, in which
 *         case the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ipv6 (const char *zt_addr,
                                uint16_t addrlen,
                                struct sockaddr_in6 *r_buf);


/**
 * Tries to convert @a zt_addr string to an IPv4 address.
 * The string is expected to have the format "1.2.3.4:80".
 *
 * @param zt_addr 0-terminated string. May be mangled by the function.
 * @param addrlen length of zt_addr (not counting 0-terminator).
 * @param r_buf a buffer to fill.
 * @return #GNUNET_OK if conversion succeded. #GNUNET_SYSERR otherwise, in which case
 *         the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ipv4 (const char *zt_addr,
                                uint16_t addrlen,
                                struct sockaddr_in *r_buf);


/**
 * Parse an address given as a string into a
 * `struct sockaddr`.
 *
 * @param addr the address
 * @param[out] af set to the parsed address family (i.e. AF_INET)
 * @param[out] sa set to the parsed address
 * @return 0 on error, otherwise number of bytes in @a sa
 */
size_t
GNUNET_STRINGS_parse_socket_addr (const char *addr,
                                  uint8_t *af,
                                  struct sockaddr **sa);


/**
 * Tries to convert @a addr string to an IP (v4 or v6) address.
 * Will automatically decide whether to treat 'addr' as v4 or v6 address.
 *
 * @param addr a string, may not be 0-terminated.
 * @param addrlen number of bytes in @a addr (if addr is 0-terminated,
 *        0-terminator should not be counted towards addrlen).
 * @param r_buf a buffer to fill.
 * @return #GNUNET_OK if conversion succeded. #GNUNET_SYSERR otherwise, in which
 *         case the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ip (const char *addr,
                              uint16_t addrlen,
                              struct sockaddr_storage *r_buf);


/**
 * Returns utf-8 encoded arguments.  Does nothing (returns a copy of
 * @a argc and @a argv) on any platform other than W32.  Returned @a
 * argv has `u8argv[u8argc] == NULL`.  Returned @a argv is a single
 * memory block, and can be freed with a single GNUNET_free() call.
 *
 * @param argc argc (as given by main())
 * @param argv argv (as given by main())
 * @param u8argc a location to store new argc in (though it's th same as argc)
 * @param u8argv a location to store new argv in
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
 */
int
GNUNET_STRINGS_get_utf8_args (int argc,
                              char *const *argv,
                              int *u8argc,
                              char *const **u8argv);


/**
 * Like strlcpy but portable. The given string @a src is copied in full length
 * (until its null byte). The destination buffer is guaranteed to be
 * null-terminated.
 *
 * to a destination buffer
 * and ensures that the destination string is null-terminated.
 *
 * @param dst destination of the copy
 * @param src source of the copy, must be null-terminated
 * @param n the length of the string to copy, including its terminating null
 *          byte
 * @return the length of the string that was copied, excluding the terminating
 *         null byte
 */
size_t
GNUNET_strlcpy (char *dst, const char *src, size_t n);


/* ***************** IPv4/IPv6 parsing ****************** */

struct GNUNET_STRINGS_PortPolicy
{
  /**
   * Starting port range (0 if none given).
   */
  uint16_t start_port;

  /**
   * End of port range (0 if none given).
   */
  uint16_t end_port;

  /**
   * #GNUNET_YES if the port range should be negated
   * ("!" in policy).
   */
  int negate_portrange;
};


/**
 * @brief IPV4 network in CIDR notation.
 */
struct GNUNET_STRINGS_IPv4NetworkPolicy
{
  /**
   * IPv4 address.
   */
  struct in_addr network;

  /**
   * IPv4 netmask.
   */
  struct in_addr netmask;

  /**
   * Policy for port access.
   */
  struct GNUNET_STRINGS_PortPolicy pp;
};


/**
 * @brief network in CIDR notation for IPV6.
 */
struct GNUNET_STRINGS_IPv6NetworkPolicy
{
  /**
   * IPv6 address.
   */
  struct in6_addr network;

  /**
   * IPv6 netmask.
   */
  struct in6_addr netmask;

  /**
   * Policy for port access.
   */
  struct GNUNET_STRINGS_PortPolicy pp;
};


/**
 * Parse an IPv4 network policy. The argument specifies a list of
 * subnets. The format is <tt>(network[/netmask][:[!]SPORT-DPORT];)*</tt>
 * (no whitespace, must be terminated with a semicolon). The network
 * must be given in dotted-decimal notation. The netmask can be given
 * in CIDR notation (/16) or in dotted-decimal (/255.255.0.0).
 *
 * @param routeListX a string specifying the IPv4 subnets
 * @return the converted list, terminated with all zeros;
 *         NULL if the synatx is flawed
 */
struct GNUNET_STRINGS_IPv4NetworkPolicy *
GNUNET_STRINGS_parse_ipv4_policy (const char *routeListX);


/**
 * Parse an IPv6 network policy. The argument specifies a list of
 * subnets. The format is <tt>(network[/netmask[:[!]SPORT[-DPORT]]];)*</tt>
 * (no whitespace, must be terminated with a semicolon). The network
 * must be given in colon-hex notation.  The netmask must be given in
 * CIDR notation (/16) or can be omitted to specify a single host.
 * Note that the netmask is mandatory if ports are specified.
 *
 * @param routeListX a string specifying the policy
 * @return the converted list, 0-terminated, NULL if the synatx is flawed
 */
struct GNUNET_STRINGS_IPv6NetworkPolicy *
GNUNET_STRINGS_parse_ipv6_policy (const char *routeListX);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif

/* ifndef GNUNET_UTIL_STRING_H */
#endif

/** @} */  /* end of group */

/* end of gnunet_util_string.h */