summaryrefslogtreecommitdiff
path: root/src/util/util.c
blob: b812ef1b118803129caae25247efcbc1194b22f5 (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
/*
    Authors:
        Simo Sorce <ssorce@redhat.com>

    Copyright (C) 2009 Red Hat

    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 <ctype.h>
#include <netdb.h>
#include <poll.h>

#include "talloc.h"
#include "util/util.h"
#include "util/sss_utf8.h"
#include "dhash.h"

/* split a string into an allocated array of strings.
 * the separator is a string, and is case-sensitive.
 * optionally single values can be trimmed of of spaces and tabs */
int split_on_separator(TALLOC_CTX *mem_ctx, const char *str,
                       const char sep, bool trim, char ***_list, int *size)
{
    const char *t, *p, *n;
    size_t l, len;
    char **list, **r;
    const char sep_str[2] = { sep, '\0'};

    if (!str || !*str || !_list) return EINVAL;

    t = str;

    list = NULL;
    l = 0;

    /* trim leading whitespace */
    if (trim)
        while (isspace(*t)) t++;

    /* find substrings separated by the separator */
    while (t && (p = strpbrk(t, sep_str))) {
        len = p - t;
        n = p + 1; /* save next string starting point */
        if (trim) {
            /* strip whitespace after the separator
             * so it's not in the next token */
            while (isspace(*t)) {
                t++;
                len--;
                if (len == 0) break;
            }
            p--;
            /* strip whitespace before the separator
             * so it's not in the current token */
            while (len > 0 && (isspace(*p))) {
                len--;
                p--;
            }
        }

        /* Add the token to the array, +2 b/c of the trailing NULL */
        r = talloc_realloc(mem_ctx, list, char *, l + 2);
        if (!r) {
            talloc_free(list);
            return ENOMEM;
        } else {
            list = r;
        }

        if (len == 0) {
            list[l] = talloc_strdup(list, "");
        } else {
            list[l] = talloc_strndup(list, t, len);
        }
        if (!list[l]) {
            talloc_free(list);
            return ENOMEM;
        }
        l++;

        t = n; /* move to next string */
    }

    /* Handle the last remaining token */
    if (t) {
        r = talloc_realloc(mem_ctx, list, char *, l + 2);
        if (!r) {
            talloc_free(list);
            return ENOMEM;
        } else {
            list = r;
        }

        if (trim) {
            /* trim leading whitespace */
            len = strlen(t);
            while (isspace(*t)) {
                t++;
                len--;
                if (len == 0) break;
            }
            /* trim trailing whitespace */
            p = t + len - 1;
            while (len > 0 && (isspace(*p))) {
                len--;
                p--;
            }

            if (len == 0) {
                list[l] = talloc_strdup(list, "");
            } else {
                list[l] = talloc_strndup(list, t, len);
            }
        } else {
            list[l] = talloc_strdup(list, t);
        }
        if (!list[l]) {
            talloc_free(list);
            return ENOMEM;
        }
        l++;
    }

    list[l] = NULL; /* terminate list */

    if (size) *size = l;
    *_list = list;

    return EOK;
}

static void free_args(char **args)
{
    int i;

    if (args) {
        for (i = 0; args[i]; i++) free(args[i]);
        free(args);
    }
}

/* parse a string into arguments.
 * arguments are separated by a space
 * '\' is an escape character and can be used only to escape
 * itself or the white space.
 */
char **parse_args(const char *str)
{
    const char *p;
    char **ret, **r;
    char *tmp;
    int num;
    int i;
    bool e, w;

    tmp = malloc(strlen(str) + 1);
    if (!tmp) return NULL;

    ret = NULL;
    num = 0;
    i = 0;
    e = false;
    w = false;
    p = str;
    while (*p) {
        if (*p == '\\') {
            w = false;
            if (e) {
                /* if we were already escaping, add a '\' literal */
                tmp[i] = '\\';
                i++;
                e = false;
            } else {
                /* otherwise just start escaping */
                e = true;
            }
        } else if (isspace(*p)) {
            if (e) {
                /* Add escaped whitespace literally */
                tmp[i] = *p;
                i++;
                e = false;
            } else if (w == false) {
                /* If previous character was non-whitespace, arg break */
                tmp[i] = '\0';
                i++;
                w = true;
            }
            /* previous char was whitespace as well, skip it */
        } else {
            w = false;
            if (e) {
                /* Prepend escaped chars with a literal \ */
                tmp[i] = '\\';
                i++;
                e = false;
            }
            /* Copy character from the source string */
            tmp[i] = *p;
            i++;
        }

        p++;

        /* check if this was the last char */
        if (*p == '\0') {
            if (e) {
                tmp[i] = '\\';
                i++;
                e = false;
            }
            tmp[i] = '\0';
            i++;
        }
        if (tmp[i-1] != '\0' || strlen(tmp) == 0) {
            /* check next char and skip multiple spaces */
            continue;
        }

        r = realloc(ret, (num + 2) * sizeof(char *));
        if (!r) goto fail;
        ret = r;
        ret[num+1] = NULL;
        ret[num] = strdup(tmp);
        if (!ret[num]) goto fail;
        num++;
        i = 0;
    }

    free(tmp);
    return ret;

fail:
    free(tmp);
    free_args(ret);
    return NULL;
}

char **dup_string_list(TALLOC_CTX *memctx, const char **str_list)
{
    int i = 0;
    int j = 0;
    char **dup_list;

    if (!str_list) {
        return NULL;
    }

    /* Find the size of the list */
    while (str_list[i]) i++;

    dup_list = talloc_array(memctx, char *, i+1);
    if (!dup_list) {
        return NULL;
    }

    /* Copy the elements */
    for (j = 0; j < i; j++) {
        dup_list[j] = talloc_strdup(dup_list, str_list[j]);
        if (!dup_list[j]) {
            talloc_free(dup_list);
            return NULL;
        }
    }

    /* NULL-terminate the list */
    dup_list[i] = NULL;

    return dup_list;
}

/* Take two string lists (terminated on a NULL char*)
 * and return up to three arrays of strings based on
 * shared ownership.
 *
 * Pass NULL to any return type you don't care about
 */
errno_t diff_string_lists(TALLOC_CTX *memctx,
                          char **_list1,
                          char **_list2,
                          char ***_list1_only,
                          char ***_list2_only,
                          char ***_both_lists)
{
    int error;
    errno_t ret;
    int i;
    int i2 = 0;
    int i12 = 0;
    hash_table_t *table;
    hash_key_t key;
    hash_value_t value;
    char **list1 = NULL;
    char **list2 = NULL;
    char **list1_only = NULL;
    char **list2_only = NULL;
    char **both_lists = NULL;
    unsigned long count;
    hash_key_t *keys;

    TALLOC_CTX *tmp_ctx = talloc_new(memctx);
    if (!tmp_ctx) {
        return ENOMEM;
    }

    if (!_list1) {
        list1 = talloc_array(tmp_ctx, char *, 1);
        if (!list1) {
            talloc_free(tmp_ctx);
            return ENOMEM;
        }
        list1[0] = NULL;
    }
    else {
        list1 = _list1;
    }

    if (!_list2) {
        list2 = talloc_array(tmp_ctx, char *, 1);
        if (!list2) {
            talloc_free(tmp_ctx);
            return ENOMEM;
        }
        list2[0] = NULL;
    }
    else {
        list2 = _list2;
    }

    error = hash_create(10, &table, NULL, NULL);
    if (error != HASH_SUCCESS) {
        talloc_free(tmp_ctx);
        return EIO;
    }

    key.type = HASH_KEY_STRING;
    value.type = HASH_VALUE_UNDEF;

    /* Add all entries from list 1 into a hash table */
    i = 0;
    while (list1[i]) {
        key.str = talloc_strdup(tmp_ctx, list1[i]);
        error = hash_enter(table, &key, &value);
        if (error != HASH_SUCCESS) {
            ret = EIO;
            goto done;
        }
        i++;
    }

    /* Iterate through list 2 and remove matching items */
    i = 0;
    while (list2[i]) {
        key.str = talloc_strdup(tmp_ctx, list2[i]);
        error = hash_delete(table, &key);
        if (error == HASH_SUCCESS) {
            if (_both_lists) {
                /* String was present in both lists */
                i12++;
                both_lists = talloc_realloc(tmp_ctx, both_lists, char *, i12+1);
                if (!both_lists) {
                    ret = ENOMEM;
                    goto done;
                }
                both_lists[i12-1] = talloc_strdup(both_lists, list2[i]);
                if (!both_lists[i12-1]) {
                    ret = ENOMEM;
                    goto done;
                }

                both_lists[i12] = NULL;
            }
        }
        else if (error == HASH_ERROR_KEY_NOT_FOUND) {
            if (_list2_only) {
                /* String was present only in list2 */
                i2++;
                list2_only = talloc_realloc(tmp_ctx, list2_only,
                                            char *, i2+1);
                if (!list2_only) {
                    ret = ENOMEM;
                    goto done;
                }
                list2_only[i2-1] = talloc_strdup(list2_only, list2[i]);
                if (!list2_only[i2-1]) {
                    ret = ENOMEM;
                    goto done;
                }

                list2_only[i2] = NULL;
            }
        }
        else {
            /* An error occurred */
            ret = EIO;
            goto done;
        }
        i++;
    }

    /* Get the leftover entries in the hash table */
    if (_list1_only) {
        error = hash_keys(table, &count, &keys);
        if (error != HASH_SUCCESS) {
            ret = EIO;
            goto done;
        }

        list1_only = talloc_array(tmp_ctx, char *, count+1);
        if (!list1_only) {
            ret = ENOMEM;
            goto done;
        }

        for (i = 0; i < count; i++) {
            list1_only[i] = talloc_strdup(list1_only, keys[i].str);
            if (!list1_only[i]) {
                ret = ENOMEM;
                goto done;
            }
        }
        list1_only[count] = NULL;

        free(keys);

        *_list1_only = talloc_steal(memctx, list1_only);
    }

    if (_list2_only) {
        if (list2_only) {
            *_list2_only = talloc_steal(memctx, list2_only);
        }
        else {
            *_list2_only = talloc_array(memctx, char *, 1);
            if (!(*_list2_only)) {
                ret = ENOMEM;
                goto done;
            }
            *_list2_only[0] = NULL;
        }
    }

    if (_both_lists) {
        if (both_lists) {
            *_both_lists = talloc_steal(memctx, both_lists);
        }
        else {
            *_both_lists = talloc_array(memctx, char *, 1);
            if (!(*_both_lists)) {
                ret = ENOMEM;
                goto done;
            }
            *_both_lists[0] = NULL;
        }
    }

    ret = EOK;

done:
    hash_destroy(table);
    talloc_free(tmp_ctx);
    return ret;
}

static void *hash_talloc(const size_t size, void *pvt)
{
    return talloc_size(pvt, size);
}

static void hash_talloc_free(void *ptr, void *pvt)
{
    talloc_free(ptr);
}

errno_t sss_hash_create_ex(TALLOC_CTX *mem_ctx,
                           unsigned long count,
                           hash_table_t **tbl,
                           unsigned int directory_bits,
                           unsigned int segment_bits,
                           unsigned long min_load_factor,
                           unsigned long max_load_factor,
                           hash_delete_callback *delete_callback,
                           void *delete_private_data)
{
    errno_t ret;
    hash_table_t *table;
    int hret;

    TALLOC_CTX *internal_ctx;
    internal_ctx = talloc_new(NULL);
    if (!internal_ctx) {
        return ENOMEM;
    }

    hret = hash_create_ex(count, &table, directory_bits, segment_bits,
                          min_load_factor, max_load_factor,
                          hash_talloc, hash_talloc_free, internal_ctx,
                          delete_callback, delete_private_data);
    switch (hret) {
    case HASH_SUCCESS:
        /* Steal the table pointer onto the mem_ctx,
         * then make the internal_ctx a child of
         * table.
         *
         * This way, we can clean up the values when
         * we talloc_free() the table
         */
        *tbl = talloc_steal(mem_ctx, table);
        talloc_steal(table, internal_ctx);
        return EOK;

    case HASH_ERROR_NO_MEMORY:
        ret = ENOMEM;
        break;
    default:
        ret = EIO;
    }

    DEBUG(0, ("Could not create hash table: [%d][%s]\n",
              hret, hash_error_string(hret)));

    talloc_free(internal_ctx);
    return ret;
}

errno_t sss_hash_create(TALLOC_CTX *mem_ctx, unsigned long count,
                        hash_table_t **tbl)
{
    return sss_hash_create_ex(mem_ctx, count, tbl, 0, 0, 0, 0, NULL, NULL);
}

errno_t sss_filter_sanitize(TALLOC_CTX *mem_ctx,
                            const char *input,
                            char **sanitized)
{
    char *output;
    size_t i = 0;
    size_t j = 0;

    /* Assume the worst-case. We'll resize it later, once */
    output = talloc_array(mem_ctx, char, strlen(input) * 3 + 1);
    if (!output) {
        return ENOMEM;
    }

    while (input[i]) {
        switch(input[i]) {
        case '*':
            output[j++] = '\\';
            output[j++] = '2';
            output[j++] = 'a';
            break;
        case '(':
            output[j++] = '\\';
            output[j++] = '2';
            output[j++] = '8';
            break;
        case ')':
            output[j++] = '\\';
            output[j++] = '2';
            output[j++] = '9';
            break;
        case '\\':
            output[j++] = '\\';
            output[j++] = '5';
            output[j++] = 'c';
            break;
        default:
            output[j++] = input[i];
        }

        i++;
    }
    output[j] = '\0';
    *sanitized = talloc_realloc(mem_ctx, output, char, j+1);
    if (!*sanitized) {
        talloc_free(output);
        return ENOMEM;
    }

    return EOK;
}

char *
sss_escape_ip_address(TALLOC_CTX *mem_ctx, int family, const char *addr)
{
    return family == AF_INET6 ? talloc_asprintf(mem_ctx, "[%s]", addr) :
                                talloc_strdup(mem_ctx, addr);
}

/* out->len includes terminating '\0' */
void to_sized_string(struct sized_string *out, const char *in)
{
    out->str = in;
    if (out->str) {
        out->len = strlen(out->str) + 1;
    } else {
        out->len = 0;
    }
}

/* This function only removes first and last
 * character if the first character was '['.
 *
 * NOTE: This means, that ipv6addr must NOT be followed
 * by port number.
 */
errno_t
remove_ipv6_brackets(char *ipv6addr)
{
    size_t len;

    if (ipv6addr && ipv6addr[0] == '[') {
        len = strlen(ipv6addr);
        if (len < 3) {
            return EINVAL;
        }

        memmove(ipv6addr, &ipv6addr[1], len - 2);
        ipv6addr[len -2] = '\0';
    }

    return EOK;
}