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1 | /* | |
2 | libloc - A library to determine the location of someone on the Internet | |
3 | ||
4 | Copyright (C) 2017 IPFire Development Team <info@ipfire.org> | |
5 | ||
6 | This library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | This library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <arpa/inet.h> | |
18 | #include <assert.h> | |
19 | #include <errno.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | ||
24 | #ifdef HAVE_ENDIAN_H | |
25 | # include <endian.h> | |
26 | #endif | |
27 | ||
28 | #include <loc/libloc.h> | |
29 | #include <loc/compat.h> | |
30 | #include <loc/country.h> | |
31 | #include <loc/network.h> | |
32 | #include <loc/private.h> | |
33 | ||
34 | struct loc_network { | |
35 | struct loc_ctx* ctx; | |
36 | int refcount; | |
37 | ||
38 | struct in6_addr start_address; | |
39 | unsigned int prefix; | |
40 | ||
41 | char country_code[3]; | |
42 | uint32_t asn; | |
43 | enum loc_network_flags flags; | |
44 | }; | |
45 | ||
46 | static int valid_prefix(struct in6_addr* address, unsigned int prefix) { | |
47 | // The prefix cannot be larger than 128 bits | |
48 | if (prefix > 128) | |
49 | return 1; | |
50 | ||
51 | // And the prefix cannot be zero | |
52 | if (prefix == 0) | |
53 | return 1; | |
54 | ||
55 | // For IPv4-mapped addresses the prefix has to be 96 or lager | |
56 | if (IN6_IS_ADDR_V4MAPPED(address) && prefix <= 96) | |
57 | return 1; | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static struct in6_addr prefix_to_bitmask(unsigned int prefix) { | |
63 | struct in6_addr bitmask; | |
64 | ||
65 | for (unsigned int i = 0; i < 16; i++) | |
66 | bitmask.s6_addr[i] = 0; | |
67 | ||
68 | for (int i = prefix, j = 0; i > 0; i -= 8, j++) { | |
69 | if (i >= 8) | |
70 | bitmask.s6_addr[j] = 0xff; | |
71 | else | |
72 | bitmask.s6_addr[j] = 0xff << (8 - i); | |
73 | } | |
74 | ||
75 | return bitmask; | |
76 | } | |
77 | ||
78 | static struct in6_addr make_start_address(const struct in6_addr* address, unsigned int prefix) { | |
79 | struct in6_addr a; | |
80 | struct in6_addr bitmask = prefix_to_bitmask(prefix); | |
81 | ||
82 | // Perform bitwise AND | |
83 | for (unsigned int i = 0; i < 4; i++) | |
84 | a.s6_addr32[i] = address->s6_addr32[i] & bitmask.s6_addr32[i]; | |
85 | ||
86 | return a; | |
87 | } | |
88 | ||
89 | static struct in6_addr make_last_address(const struct in6_addr* address, unsigned int prefix) { | |
90 | struct in6_addr a; | |
91 | struct in6_addr bitmask = prefix_to_bitmask(prefix); | |
92 | ||
93 | // Perform bitwise OR | |
94 | for (unsigned int i = 0; i < 4; i++) | |
95 | a.s6_addr32[i] = address->s6_addr32[i] | ~bitmask.s6_addr32[i]; | |
96 | ||
97 | return a; | |
98 | } | |
99 | ||
100 | LOC_EXPORT int loc_network_new(struct loc_ctx* ctx, struct loc_network** network, | |
101 | struct in6_addr* address, unsigned int prefix) { | |
102 | // Address cannot be unspecified | |
103 | if (IN6_IS_ADDR_UNSPECIFIED(address)) { | |
104 | DEBUG(ctx, "Start address is unspecified\n"); | |
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | // Address cannot be loopback | |
109 | if (IN6_IS_ADDR_LOOPBACK(address)) { | |
110 | DEBUG(ctx, "Start address is loopback address\n"); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | // Address cannot be link-local | |
115 | if (IN6_IS_ADDR_LINKLOCAL(address)) { | |
116 | DEBUG(ctx, "Start address cannot be link-local\n"); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | // Address cannot be site-local | |
121 | if (IN6_IS_ADDR_SITELOCAL(address)) { | |
122 | DEBUG(ctx, "Start address cannot be site-local\n"); | |
123 | return -EINVAL; | |
124 | } | |
125 | ||
126 | // Validate the prefix | |
127 | if (valid_prefix(address, prefix) != 0) { | |
128 | DEBUG(ctx, "Invalid prefix: %u\n", prefix); | |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | struct loc_network* n = calloc(1, sizeof(*n)); | |
133 | if (!n) | |
134 | return -ENOMEM; | |
135 | ||
136 | n->ctx = loc_ref(ctx); | |
137 | n->refcount = 1; | |
138 | ||
139 | // Store the first address in the network | |
140 | n->start_address = make_start_address(address, prefix); | |
141 | n->prefix = prefix; | |
142 | ||
143 | DEBUG(n->ctx, "Network allocated at %p\n", n); | |
144 | *network = n; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static int loc_network_address_family(struct loc_network* network) { | |
149 | if (IN6_IS_ADDR_V4MAPPED(&network->start_address)) | |
150 | return AF_INET; | |
151 | ||
152 | return AF_INET6; | |
153 | } | |
154 | ||
155 | LOC_EXPORT int loc_network_new_from_string(struct loc_ctx* ctx, struct loc_network** network, | |
156 | const char* address_string) { | |
157 | struct in6_addr start_address; | |
158 | unsigned int prefix = 0; | |
159 | char* prefix_string; | |
160 | int r = 1; | |
161 | ||
162 | // Make a copy of the string to work on it | |
163 | char* buffer = strdup(address_string); | |
164 | address_string = prefix_string = buffer; | |
165 | ||
166 | // Split address and prefix | |
167 | address_string = strsep(&prefix_string, "/"); | |
168 | ||
169 | // Did we find a prefix? | |
170 | if (prefix_string) { | |
171 | // Convert prefix to integer | |
172 | prefix = strtol(prefix_string, NULL, 10); | |
173 | ||
174 | if (prefix) { | |
175 | // Parse the address | |
176 | r = loc_parse_address(ctx, address_string, &start_address); | |
177 | ||
178 | // Map the prefix to IPv6 if needed | |
179 | if (IN6_IS_ADDR_V4MAPPED(&start_address)) | |
180 | prefix += 96; | |
181 | } | |
182 | } | |
183 | ||
184 | // Free temporary buffer | |
185 | free(buffer); | |
186 | ||
187 | if (r == 0) { | |
188 | r = loc_network_new(ctx, network, &start_address, prefix); | |
189 | } | |
190 | ||
191 | return r; | |
192 | } | |
193 | ||
194 | LOC_EXPORT struct loc_network* loc_network_ref(struct loc_network* network) { | |
195 | network->refcount++; | |
196 | ||
197 | return network; | |
198 | } | |
199 | ||
200 | static void loc_network_free(struct loc_network* network) { | |
201 | DEBUG(network->ctx, "Releasing network at %p\n", network); | |
202 | ||
203 | loc_unref(network->ctx); | |
204 | free(network); | |
205 | } | |
206 | ||
207 | LOC_EXPORT struct loc_network* loc_network_unref(struct loc_network* network) { | |
208 | if (!network) | |
209 | return NULL; | |
210 | ||
211 | if (--network->refcount > 0) | |
212 | return network; | |
213 | ||
214 | loc_network_free(network); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | static int format_ipv6_address(const struct in6_addr* address, char* string, size_t length) { | |
219 | const char* ret = inet_ntop(AF_INET6, address, string, length); | |
220 | if (!ret) | |
221 | return -1; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int format_ipv4_address(const struct in6_addr* address, char* string, size_t length) { | |
227 | struct in_addr ipv4_address; | |
228 | ipv4_address.s_addr = address->s6_addr32[3]; | |
229 | ||
230 | const char* ret = inet_ntop(AF_INET, &ipv4_address, string, length); | |
231 | if (!ret) | |
232 | return -1; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | LOC_EXPORT char* loc_network_str(struct loc_network* network) { | |
238 | int r; | |
239 | const size_t length = INET6_ADDRSTRLEN + 4; | |
240 | ||
241 | char* string = malloc(length); | |
242 | if (!string) | |
243 | return NULL; | |
244 | ||
245 | unsigned int prefix = network->prefix; | |
246 | ||
247 | int family = loc_network_address_family(network); | |
248 | switch (family) { | |
249 | case AF_INET6: | |
250 | r = format_ipv6_address(&network->start_address, string, length); | |
251 | break; | |
252 | ||
253 | case AF_INET: | |
254 | r = format_ipv4_address(&network->start_address, string, length); | |
255 | prefix -= 96; | |
256 | break; | |
257 | ||
258 | default: | |
259 | r = -1; | |
260 | break; | |
261 | } | |
262 | ||
263 | if (r) { | |
264 | ERROR(network->ctx, "Could not convert network to string: %s\n", strerror(errno)); | |
265 | free(string); | |
266 | ||
267 | return NULL; | |
268 | } | |
269 | ||
270 | // Append prefix | |
271 | sprintf(string + strlen(string), "/%u", prefix); | |
272 | ||
273 | return string; | |
274 | } | |
275 | ||
276 | LOC_EXPORT int loc_network_match_address(struct loc_network* network, const struct in6_addr* address) { | |
277 | // Address must be larger than the start address | |
278 | if (in6_addr_cmp(&network->start_address, address) > 0) | |
279 | return 1; | |
280 | ||
281 | // Determine the last address in this network | |
282 | struct in6_addr last_address = make_last_address(&network->start_address, network->prefix); | |
283 | ||
284 | // Address must be smaller than the last address | |
285 | if (in6_addr_cmp(address, &last_address) > 0) | |
286 | return 1; | |
287 | ||
288 | // The address is inside this network | |
289 | return 0; | |
290 | } | |
291 | ||
292 | LOC_EXPORT const char* loc_network_get_country_code(struct loc_network* network) { | |
293 | return network->country_code; | |
294 | } | |
295 | ||
296 | LOC_EXPORT int loc_network_set_country_code(struct loc_network* network, const char* country_code) { | |
297 | // Set empty country code | |
298 | if (!country_code || !*country_code) { | |
299 | *network->country_code = '\0'; | |
300 | return 0; | |
301 | } | |
302 | ||
303 | // Check country code | |
304 | if (!loc_country_code_is_valid(country_code)) | |
305 | return -EINVAL; | |
306 | ||
307 | loc_country_code_copy(network->country_code, country_code); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | LOC_EXPORT int loc_network_match_country_code(struct loc_network* network, const char* country_code) { | |
313 | // Check country code | |
314 | if (!loc_country_code_is_valid(country_code)) | |
315 | return -EINVAL; | |
316 | ||
317 | return (network->country_code[0] == country_code[0]) | |
318 | && (network->country_code[1] == country_code[1]); | |
319 | } | |
320 | ||
321 | LOC_EXPORT uint32_t loc_network_get_asn(struct loc_network* network) { | |
322 | return network->asn; | |
323 | } | |
324 | ||
325 | LOC_EXPORT int loc_network_set_asn(struct loc_network* network, uint32_t asn) { | |
326 | network->asn = asn; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | LOC_EXPORT int loc_network_match_asn(struct loc_network* network, uint32_t asn) { | |
332 | return network->asn == asn; | |
333 | } | |
334 | ||
335 | LOC_EXPORT int loc_network_has_flag(struct loc_network* network, uint32_t flag) { | |
336 | return network->flags & flag; | |
337 | } | |
338 | ||
339 | LOC_EXPORT int loc_network_set_flag(struct loc_network* network, uint32_t flag) { | |
340 | network->flags |= flag; | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | LOC_EXPORT int loc_network_match_flag(struct loc_network* network, uint32_t flag) { | |
346 | return loc_network_has_flag(network, flag); | |
347 | } | |
348 | ||
349 | LOC_EXPORT int loc_network_to_database_v0(struct loc_network* network, struct loc_database_network_v0* dbobj) { | |
350 | // Add country code | |
351 | loc_country_code_copy(dbobj->country_code, network->country_code); | |
352 | ||
353 | // Add ASN | |
354 | dbobj->asn = htobe32(network->asn); | |
355 | ||
356 | // Flags | |
357 | dbobj->flags = htobe16(network->flags); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | LOC_EXPORT int loc_network_new_from_database_v0(struct loc_ctx* ctx, struct loc_network** network, | |
363 | struct in6_addr* address, unsigned int prefix, const struct loc_database_network_v0* dbobj) { | |
364 | char country_code[3] = "\0\0"; | |
365 | ||
366 | int r = loc_network_new(ctx, network, address, prefix); | |
367 | if (r) { | |
368 | ERROR(ctx, "Could not allocate a new network: %s", strerror(-r)); | |
369 | return r; | |
370 | } | |
371 | ||
372 | // Import country code | |
373 | loc_country_code_copy(country_code, dbobj->country_code); | |
374 | ||
375 | r = loc_network_set_country_code(*network, country_code); | |
376 | if (r) { | |
377 | ERROR(ctx, "Could not set country code: %s\n", country_code); | |
378 | return r; | |
379 | } | |
380 | ||
381 | // Import ASN | |
382 | uint32_t asn = be32toh(dbobj->asn); | |
383 | r = loc_network_set_asn(*network, asn); | |
384 | if (r) { | |
385 | ERROR(ctx, "Could not set ASN: %d\n", asn); | |
386 | return r; | |
387 | } | |
388 | ||
389 | // Import flags | |
390 | int flags = be16toh(dbobj->flags); | |
391 | r = loc_network_set_flag(*network, flags); | |
392 | if (r) { | |
393 | ERROR(ctx, "Could not set flags: %d\n", flags); | |
394 | return r; | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | struct loc_network_tree { | |
401 | struct loc_ctx* ctx; | |
402 | int refcount; | |
403 | ||
404 | struct loc_network_tree_node* root; | |
405 | }; | |
406 | ||
407 | struct loc_network_tree_node { | |
408 | struct loc_ctx* ctx; | |
409 | int refcount; | |
410 | ||
411 | struct loc_network_tree_node* zero; | |
412 | struct loc_network_tree_node* one; | |
413 | ||
414 | struct loc_network* network; | |
415 | }; | |
416 | ||
417 | LOC_EXPORT int loc_network_tree_new(struct loc_ctx* ctx, struct loc_network_tree** tree) { | |
418 | struct loc_network_tree* t = calloc(1, sizeof(*t)); | |
419 | if (!t) | |
420 | return -ENOMEM; | |
421 | ||
422 | t->ctx = loc_ref(ctx); | |
423 | t->refcount = 1; | |
424 | ||
425 | // Create the root node | |
426 | int r = loc_network_tree_node_new(ctx, &t->root); | |
427 | if (r) { | |
428 | loc_network_tree_unref(t); | |
429 | return r; | |
430 | } | |
431 | ||
432 | DEBUG(t->ctx, "Network tree allocated at %p\n", t); | |
433 | *tree = t; | |
434 | return 0; | |
435 | } | |
436 | ||
437 | LOC_EXPORT struct loc_network_tree_node* loc_network_tree_get_root(struct loc_network_tree* tree) { | |
438 | return loc_network_tree_node_ref(tree->root); | |
439 | } | |
440 | ||
441 | static struct loc_network_tree_node* loc_network_tree_get_node(struct loc_network_tree_node* node, int path) { | |
442 | struct loc_network_tree_node** n; | |
443 | ||
444 | if (path == 0) | |
445 | n = &node->zero; | |
446 | else | |
447 | n = &node->one; | |
448 | ||
449 | // If the desired node doesn't exist, yet, we will create it | |
450 | if (*n == NULL) { | |
451 | int r = loc_network_tree_node_new(node->ctx, n); | |
452 | if (r) | |
453 | return NULL; | |
454 | } | |
455 | ||
456 | return *n; | |
457 | } | |
458 | ||
459 | static struct loc_network_tree_node* loc_network_tree_get_path(struct loc_network_tree* tree, const struct in6_addr* address, unsigned int prefix) { | |
460 | struct loc_network_tree_node* node = tree->root; | |
461 | ||
462 | for (unsigned int i = 0; i < prefix; i++) { | |
463 | // Check if the ith bit is one or zero | |
464 | node = loc_network_tree_get_node(node, in6_addr_get_bit(address, i)); | |
465 | } | |
466 | ||
467 | return node; | |
468 | } | |
469 | ||
470 | static int __loc_network_tree_walk(struct loc_ctx* ctx, struct loc_network_tree_node* node, | |
471 | int(*filter_callback)(struct loc_network* network, void* data), | |
472 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
473 | int r; | |
474 | ||
475 | // Finding a network ends the walk here | |
476 | if (node->network) { | |
477 | if (filter_callback) { | |
478 | int f = filter_callback(node->network, data); | |
479 | if (f < 0) | |
480 | return f; | |
481 | ||
482 | // Skip network if filter function returns value greater than zero | |
483 | if (f > 0) | |
484 | return 0; | |
485 | } | |
486 | ||
487 | r = callback(node->network, data); | |
488 | if (r) | |
489 | return r; | |
490 | } | |
491 | ||
492 | // Walk down on the left side of the tree first | |
493 | if (node->zero) { | |
494 | r = __loc_network_tree_walk(ctx, node->zero, filter_callback, callback, data); | |
495 | if (r) | |
496 | return r; | |
497 | } | |
498 | ||
499 | // Then walk on the other side | |
500 | if (node->one) { | |
501 | r = __loc_network_tree_walk(ctx, node->one, filter_callback, callback, data); | |
502 | if (r) | |
503 | return r; | |
504 | } | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | LOC_EXPORT int loc_network_tree_walk(struct loc_network_tree* tree, | |
510 | int(*filter_callback)(struct loc_network* network, void* data), | |
511 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
512 | return __loc_network_tree_walk(tree->ctx, tree->root, filter_callback, callback, data); | |
513 | } | |
514 | ||
515 | static void loc_network_tree_free(struct loc_network_tree* tree) { | |
516 | DEBUG(tree->ctx, "Releasing network tree at %p\n", tree); | |
517 | ||
518 | loc_network_tree_node_unref(tree->root); | |
519 | ||
520 | loc_unref(tree->ctx); | |
521 | free(tree); | |
522 | } | |
523 | ||
524 | LOC_EXPORT struct loc_network_tree* loc_network_tree_unref(struct loc_network_tree* tree) { | |
525 | if (--tree->refcount > 0) | |
526 | return tree; | |
527 | ||
528 | loc_network_tree_free(tree); | |
529 | return NULL; | |
530 | } | |
531 | ||
532 | static int __loc_network_tree_dump(struct loc_network* network, void* data) { | |
533 | DEBUG(network->ctx, "Dumping network at %p\n", network); | |
534 | ||
535 | char* s = loc_network_str(network); | |
536 | if (!s) | |
537 | return 1; | |
538 | ||
539 | INFO(network->ctx, "%s\n", s); | |
540 | free(s); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | LOC_EXPORT int loc_network_tree_dump(struct loc_network_tree* tree) { | |
546 | DEBUG(tree->ctx, "Dumping network tree at %p\n", tree); | |
547 | ||
548 | return loc_network_tree_walk(tree, NULL, __loc_network_tree_dump, NULL); | |
549 | } | |
550 | ||
551 | LOC_EXPORT int loc_network_tree_add_network(struct loc_network_tree* tree, struct loc_network* network) { | |
552 | DEBUG(tree->ctx, "Adding network %p to tree %p\n", network, tree); | |
553 | ||
554 | struct loc_network_tree_node* node = loc_network_tree_get_path(tree, | |
555 | &network->start_address, network->prefix); | |
556 | if (!node) { | |
557 | ERROR(tree->ctx, "Could not find a node\n"); | |
558 | return -ENOMEM; | |
559 | } | |
560 | ||
561 | // Check if node has not been set before | |
562 | if (node->network) { | |
563 | DEBUG(tree->ctx, "There is already a network at this path\n"); | |
564 | return -EBUSY; | |
565 | } | |
566 | ||
567 | // Point node to the network | |
568 | node->network = loc_network_ref(network); | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static int __loc_network_tree_count(struct loc_network* network, void* data) { | |
574 | size_t* counter = (size_t*)data; | |
575 | ||
576 | // Increase the counter for each network | |
577 | counter++; | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | LOC_EXPORT size_t loc_network_tree_count_networks(struct loc_network_tree* tree) { | |
583 | size_t counter = 0; | |
584 | ||
585 | int r = loc_network_tree_walk(tree, NULL, __loc_network_tree_count, &counter); | |
586 | if (r) | |
587 | return r; | |
588 | ||
589 | return counter; | |
590 | } | |
591 | ||
592 | static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node* node) { | |
593 | size_t counter = 1; | |
594 | ||
595 | if (node->zero) | |
596 | counter += __loc_network_tree_count_nodes(node->zero); | |
597 | ||
598 | if (node->one) | |
599 | counter += __loc_network_tree_count_nodes(node->one); | |
600 | ||
601 | return counter; | |
602 | } | |
603 | ||
604 | LOC_EXPORT size_t loc_network_tree_count_nodes(struct loc_network_tree* tree) { | |
605 | return __loc_network_tree_count_nodes(tree->root); | |
606 | } | |
607 | ||
608 | LOC_EXPORT int loc_network_tree_node_new(struct loc_ctx* ctx, struct loc_network_tree_node** node) { | |
609 | struct loc_network_tree_node* n = calloc(1, sizeof(*n)); | |
610 | if (!n) | |
611 | return -ENOMEM; | |
612 | ||
613 | n->ctx = loc_ref(ctx); | |
614 | n->refcount = 1; | |
615 | ||
616 | n->zero = n->one = NULL; | |
617 | ||
618 | DEBUG(n->ctx, "Network node allocated at %p\n", n); | |
619 | *node = n; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | LOC_EXPORT struct loc_network_tree_node* loc_network_tree_node_ref(struct loc_network_tree_node* node) { | |
624 | if (node) | |
625 | node->refcount++; | |
626 | ||
627 | return node; | |
628 | } | |
629 | ||
630 | static void loc_network_tree_node_free(struct loc_network_tree_node* node) { | |
631 | DEBUG(node->ctx, "Releasing network node at %p\n", node); | |
632 | ||
633 | if (node->network) | |
634 | loc_network_unref(node->network); | |
635 | ||
636 | if (node->zero) | |
637 | loc_network_tree_node_unref(node->zero); | |
638 | ||
639 | if (node->one) | |
640 | loc_network_tree_node_unref(node->one); | |
641 | ||
642 | loc_unref(node->ctx); | |
643 | free(node); | |
644 | } | |
645 | ||
646 | LOC_EXPORT struct loc_network_tree_node* loc_network_tree_node_unref(struct loc_network_tree_node* node) { | |
647 | if (!node) | |
648 | return NULL; | |
649 | ||
650 | if (--node->refcount > 0) | |
651 | return node; | |
652 | ||
653 | loc_network_tree_node_free(node); | |
654 | return NULL; | |
655 | } | |
656 | ||
657 | LOC_EXPORT struct loc_network_tree_node* loc_network_tree_node_get(struct loc_network_tree_node* node, unsigned int index) { | |
658 | if (index == 0) | |
659 | node = node->zero; | |
660 | else | |
661 | node = node->one; | |
662 | ||
663 | if (!node) | |
664 | return NULL; | |
665 | ||
666 | return loc_network_tree_node_ref(node); | |
667 | } | |
668 | ||
669 | LOC_EXPORT int loc_network_tree_node_is_leaf(struct loc_network_tree_node* node) { | |
670 | return (!!node->network); | |
671 | } | |
672 | ||
673 | LOC_EXPORT struct loc_network* loc_network_tree_node_get_network(struct loc_network_tree_node* node) { | |
674 | return loc_network_ref(node->network); | |
675 | } |