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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/network-list.h> | |
33 | #include <loc/private.h> | |
34 | ||
35 | struct loc_network { | |
36 | struct loc_ctx* ctx; | |
37 | int refcount; | |
38 | ||
39 | int family; | |
40 | struct in6_addr first_address; | |
41 | struct in6_addr last_address; | |
42 | unsigned int prefix; | |
43 | ||
44 | char country_code[3]; | |
45 | uint32_t asn; | |
46 | enum loc_network_flags flags; | |
47 | }; | |
48 | ||
49 | static int valid_prefix(struct in6_addr* address, unsigned int prefix) { | |
50 | // The prefix cannot be larger than 128 bits | |
51 | if (prefix > 128) | |
52 | return 1; | |
53 | ||
54 | // And the prefix cannot be zero | |
55 | if (prefix == 0) | |
56 | return 1; | |
57 | ||
58 | // For IPv4-mapped addresses the prefix has to be 96 or lager | |
59 | if (IN6_IS_ADDR_V4MAPPED(address) && prefix <= 96) | |
60 | return 1; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static struct in6_addr prefix_to_bitmask(unsigned int prefix) { | |
66 | struct in6_addr bitmask; | |
67 | ||
68 | for (unsigned int i = 0; i < 16; i++) | |
69 | bitmask.s6_addr[i] = 0; | |
70 | ||
71 | for (int i = prefix, j = 0; i > 0; i -= 8, j++) { | |
72 | if (i >= 8) | |
73 | bitmask.s6_addr[j] = 0xff; | |
74 | else | |
75 | bitmask.s6_addr[j] = 0xff << (8 - i); | |
76 | } | |
77 | ||
78 | return bitmask; | |
79 | } | |
80 | ||
81 | static struct in6_addr make_first_address(const struct in6_addr* address, const struct in6_addr* bitmask) { | |
82 | struct in6_addr a; | |
83 | ||
84 | // Perform bitwise AND | |
85 | for (unsigned int i = 0; i < 4; i++) | |
86 | a.s6_addr32[i] = address->s6_addr32[i] & bitmask->s6_addr32[i]; | |
87 | ||
88 | return a; | |
89 | } | |
90 | ||
91 | static struct in6_addr make_last_address(const struct in6_addr* address, const struct in6_addr* bitmask) { | |
92 | struct in6_addr a; | |
93 | ||
94 | // Perform bitwise OR | |
95 | for (unsigned int i = 0; i < 4; i++) | |
96 | a.s6_addr32[i] = address->s6_addr32[i] | ~bitmask->s6_addr32[i]; | |
97 | ||
98 | return a; | |
99 | } | |
100 | ||
101 | static struct in6_addr address_increment(const struct in6_addr* address) { | |
102 | struct in6_addr a = *address; | |
103 | ||
104 | for (int octet = 15; octet >= 0; octet--) { | |
105 | if (a.s6_addr[octet] < 255) { | |
106 | a.s6_addr[octet]++; | |
107 | break; | |
108 | } else { | |
109 | a.s6_addr[octet] = 0; | |
110 | } | |
111 | } | |
112 | ||
113 | return a; | |
114 | } | |
115 | ||
116 | LOC_EXPORT int loc_network_new(struct loc_ctx* ctx, struct loc_network** network, | |
117 | struct in6_addr* address, unsigned int prefix) { | |
118 | // Address cannot be unspecified | |
119 | if (IN6_IS_ADDR_UNSPECIFIED(address)) { | |
120 | DEBUG(ctx, "Start address is unspecified\n"); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | // Address cannot be loopback | |
125 | if (IN6_IS_ADDR_LOOPBACK(address)) { | |
126 | DEBUG(ctx, "Start address is loopback address\n"); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | // Address cannot be link-local | |
131 | if (IN6_IS_ADDR_LINKLOCAL(address)) { | |
132 | DEBUG(ctx, "Start address cannot be link-local\n"); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | // Address cannot be site-local | |
137 | if (IN6_IS_ADDR_SITELOCAL(address)) { | |
138 | DEBUG(ctx, "Start address cannot be site-local\n"); | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | // Validate the prefix | |
143 | if (valid_prefix(address, prefix) != 0) { | |
144 | DEBUG(ctx, "Invalid prefix: %u\n", prefix); | |
145 | return -EINVAL; | |
146 | } | |
147 | ||
148 | struct loc_network* n = calloc(1, sizeof(*n)); | |
149 | if (!n) | |
150 | return -ENOMEM; | |
151 | ||
152 | n->ctx = loc_ref(ctx); | |
153 | n->refcount = 1; | |
154 | ||
155 | // Store the prefix | |
156 | n->prefix = prefix; | |
157 | ||
158 | // Convert the prefix into a bitmask | |
159 | struct in6_addr bitmask = prefix_to_bitmask(n->prefix); | |
160 | ||
161 | // Store the first and last address in the network | |
162 | n->first_address = make_first_address(address, &bitmask); | |
163 | n->last_address = make_last_address(&n->first_address, &bitmask); | |
164 | ||
165 | // Set family | |
166 | if (IN6_IS_ADDR_V4MAPPED(&n->first_address)) | |
167 | n->family = AF_INET; | |
168 | else | |
169 | n->family = AF_INET6; | |
170 | ||
171 | DEBUG(n->ctx, "Network allocated at %p\n", n); | |
172 | *network = n; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | LOC_EXPORT int loc_network_new_from_string(struct loc_ctx* ctx, struct loc_network** network, | |
177 | const char* address_string) { | |
178 | struct in6_addr first_address; | |
179 | char* prefix_string; | |
180 | unsigned int prefix = 128; | |
181 | int r = -EINVAL; | |
182 | ||
183 | DEBUG(ctx, "Attempting to parse network %s\n", address_string); | |
184 | ||
185 | // Make a copy of the string to work on it | |
186 | char* buffer = strdup(address_string); | |
187 | address_string = prefix_string = buffer; | |
188 | ||
189 | // Split address and prefix | |
190 | address_string = strsep(&prefix_string, "/"); | |
191 | ||
192 | DEBUG(ctx, " Split into address = %s, prefix = %s\n", address_string, prefix_string); | |
193 | ||
194 | // Parse the address | |
195 | r = loc_parse_address(ctx, address_string, &first_address); | |
196 | if (r) { | |
197 | DEBUG(ctx, "The address could not be parsed\n"); | |
198 | goto FAIL; | |
199 | } | |
200 | ||
201 | // If a prefix was given, we will try to parse it | |
202 | if (prefix_string) { | |
203 | // Convert prefix to integer | |
204 | prefix = strtol(prefix_string, NULL, 10); | |
205 | ||
206 | if (!prefix) { | |
207 | DEBUG(ctx, "The prefix was not parsable: %s\n", prefix_string); | |
208 | goto FAIL; | |
209 | } | |
210 | ||
211 | // Map the prefix to IPv6 if needed | |
212 | if (IN6_IS_ADDR_V4MAPPED(&first_address)) | |
213 | prefix += 96; | |
214 | } | |
215 | ||
216 | FAIL: | |
217 | // Free temporary buffer | |
218 | free(buffer); | |
219 | ||
220 | // Exit if the parsing was unsuccessful | |
221 | if (r) | |
222 | return r; | |
223 | ||
224 | // Create a new network | |
225 | return loc_network_new(ctx, network, &first_address, prefix); | |
226 | } | |
227 | ||
228 | LOC_EXPORT struct loc_network* loc_network_ref(struct loc_network* network) { | |
229 | network->refcount++; | |
230 | ||
231 | return network; | |
232 | } | |
233 | ||
234 | static void loc_network_free(struct loc_network* network) { | |
235 | DEBUG(network->ctx, "Releasing network at %p\n", network); | |
236 | ||
237 | loc_unref(network->ctx); | |
238 | free(network); | |
239 | } | |
240 | ||
241 | LOC_EXPORT struct loc_network* loc_network_unref(struct loc_network* network) { | |
242 | if (!network) | |
243 | return NULL; | |
244 | ||
245 | if (--network->refcount > 0) | |
246 | return network; | |
247 | ||
248 | loc_network_free(network); | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | static int format_ipv6_address(const struct in6_addr* address, char* string, size_t length) { | |
253 | const char* ret = inet_ntop(AF_INET6, address, string, length); | |
254 | if (!ret) | |
255 | return -1; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | static int format_ipv4_address(const struct in6_addr* address, char* string, size_t length) { | |
261 | struct in_addr ipv4_address; | |
262 | ipv4_address.s_addr = address->s6_addr32[3]; | |
263 | ||
264 | const char* ret = inet_ntop(AF_INET, &ipv4_address, string, length); | |
265 | if (!ret) | |
266 | return -1; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | LOC_EXPORT char* loc_network_str(struct loc_network* network) { | |
272 | int r; | |
273 | const size_t length = INET6_ADDRSTRLEN + 4; | |
274 | ||
275 | char* string = malloc(length); | |
276 | if (!string) | |
277 | return NULL; | |
278 | ||
279 | unsigned int prefix = network->prefix; | |
280 | ||
281 | switch (network->family) { | |
282 | case AF_INET6: | |
283 | r = format_ipv6_address(&network->first_address, string, length); | |
284 | break; | |
285 | ||
286 | case AF_INET: | |
287 | r = format_ipv4_address(&network->first_address, string, length); | |
288 | prefix -= 96; | |
289 | break; | |
290 | ||
291 | default: | |
292 | r = -1; | |
293 | break; | |
294 | } | |
295 | ||
296 | if (r) { | |
297 | ERROR(network->ctx, "Could not convert network to string: %s\n", strerror(errno)); | |
298 | free(string); | |
299 | ||
300 | return NULL; | |
301 | } | |
302 | ||
303 | // Append prefix | |
304 | sprintf(string + strlen(string), "/%u", prefix); | |
305 | ||
306 | return string; | |
307 | } | |
308 | ||
309 | LOC_EXPORT int loc_network_address_family(struct loc_network* network) { | |
310 | return network->family; | |
311 | } | |
312 | ||
313 | LOC_EXPORT unsigned int loc_network_prefix(struct loc_network* network) { | |
314 | switch (network->family) { | |
315 | case AF_INET6: | |
316 | return network->prefix; | |
317 | ||
318 | case AF_INET: | |
319 | return network->prefix - 96; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | static char* loc_network_format_address(struct loc_network* network, const struct in6_addr* address) { | |
326 | const size_t length = INET6_ADDRSTRLEN; | |
327 | ||
328 | char* string = malloc(length); | |
329 | if (!string) | |
330 | return NULL; | |
331 | ||
332 | int r = 0; | |
333 | ||
334 | switch (network->family) { | |
335 | case AF_INET6: | |
336 | r = format_ipv6_address(address, string, length); | |
337 | break; | |
338 | ||
339 | case AF_INET: | |
340 | r = format_ipv4_address(address, string, length); | |
341 | break; | |
342 | ||
343 | default: | |
344 | r = -1; | |
345 | break; | |
346 | } | |
347 | ||
348 | if (r) { | |
349 | ERROR(network->ctx, "Could not format IP address to string: %s\n", strerror(errno)); | |
350 | free(string); | |
351 | ||
352 | return NULL; | |
353 | } | |
354 | ||
355 | return string; | |
356 | } | |
357 | ||
358 | LOC_EXPORT const struct in6_addr* loc_network_get_first_address(struct loc_network* network) { | |
359 | return &network->first_address; | |
360 | } | |
361 | ||
362 | LOC_EXPORT char* loc_network_format_first_address(struct loc_network* network) { | |
363 | return loc_network_format_address(network, &network->first_address); | |
364 | } | |
365 | ||
366 | LOC_EXPORT const struct in6_addr* loc_network_get_last_address(struct loc_network* network) { | |
367 | return &network->last_address; | |
368 | } | |
369 | ||
370 | LOC_EXPORT char* loc_network_format_last_address(struct loc_network* network) { | |
371 | return loc_network_format_address(network, &network->last_address); | |
372 | } | |
373 | ||
374 | LOC_EXPORT int loc_network_match_address(struct loc_network* network, const struct in6_addr* address) { | |
375 | // Address must be larger than the start address | |
376 | if (in6_addr_cmp(&network->first_address, address) > 0) | |
377 | return 0; | |
378 | ||
379 | // Address must be smaller than the last address | |
380 | if (in6_addr_cmp(&network->last_address, address) < 0) | |
381 | return 0; | |
382 | ||
383 | // The address is inside this network | |
384 | return 1; | |
385 | } | |
386 | ||
387 | LOC_EXPORT const char* loc_network_get_country_code(struct loc_network* network) { | |
388 | return network->country_code; | |
389 | } | |
390 | ||
391 | LOC_EXPORT int loc_network_set_country_code(struct loc_network* network, const char* country_code) { | |
392 | // Set empty country code | |
393 | if (!country_code || !*country_code) { | |
394 | *network->country_code = '\0'; | |
395 | return 0; | |
396 | } | |
397 | ||
398 | // Check country code | |
399 | if (!loc_country_code_is_valid(country_code)) | |
400 | return -EINVAL; | |
401 | ||
402 | loc_country_code_copy(network->country_code, country_code); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | LOC_EXPORT int loc_network_match_country_code(struct loc_network* network, const char* country_code) { | |
408 | // Check country code | |
409 | if (!loc_country_code_is_valid(country_code)) | |
410 | return -EINVAL; | |
411 | ||
412 | return (network->country_code[0] == country_code[0]) | |
413 | && (network->country_code[1] == country_code[1]); | |
414 | } | |
415 | ||
416 | LOC_EXPORT uint32_t loc_network_get_asn(struct loc_network* network) { | |
417 | return network->asn; | |
418 | } | |
419 | ||
420 | LOC_EXPORT int loc_network_set_asn(struct loc_network* network, uint32_t asn) { | |
421 | network->asn = asn; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | LOC_EXPORT int loc_network_match_asn(struct loc_network* network, uint32_t asn) { | |
427 | return network->asn == asn; | |
428 | } | |
429 | ||
430 | LOC_EXPORT int loc_network_has_flag(struct loc_network* network, uint32_t flag) { | |
431 | return network->flags & flag; | |
432 | } | |
433 | ||
434 | LOC_EXPORT int loc_network_set_flag(struct loc_network* network, uint32_t flag) { | |
435 | network->flags |= flag; | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | LOC_EXPORT int loc_network_match_flag(struct loc_network* network, uint32_t flag) { | |
441 | return loc_network_has_flag(network, flag); | |
442 | } | |
443 | ||
444 | LOC_EXPORT int loc_network_cmp(struct loc_network* self, struct loc_network* other) { | |
445 | // Compare address | |
446 | int r = in6_addr_cmp(&self->first_address, &other->first_address); | |
447 | if (r) | |
448 | return r; | |
449 | ||
450 | // Compare prefix | |
451 | if (self->prefix > other->prefix) | |
452 | return 1; | |
453 | else if (self->prefix < other->prefix) | |
454 | return -1; | |
455 | ||
456 | // Both networks are equal | |
457 | return 0; | |
458 | } | |
459 | ||
460 | LOC_EXPORT int loc_network_overlaps(struct loc_network* self, struct loc_network* other) { | |
461 | // Either of the start addresses must be in the other subnet | |
462 | if (loc_network_match_address(self, &other->first_address)) | |
463 | return 1; | |
464 | ||
465 | if (loc_network_match_address(other, &self->first_address)) | |
466 | return 1; | |
467 | ||
468 | // Or either of the end addresses is in the other subnet | |
469 | if (loc_network_match_address(self, &other->last_address)) | |
470 | return 1; | |
471 | ||
472 | if (loc_network_match_address(other, &self->last_address)) | |
473 | return 1; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | LOC_EXPORT int loc_network_is_subnet(struct loc_network* self, struct loc_network* other) { | |
479 | // The prefix must be smaller (this avoids the more complex comparisons later) | |
480 | if (self->prefix > other->prefix) | |
481 | return 0; | |
482 | ||
483 | // If the start address of the other network is smaller than this network, | |
484 | // it cannot be a subnet. | |
485 | if (in6_addr_cmp(&self->first_address, &other->first_address) > 0) | |
486 | return 0; | |
487 | ||
488 | // If the end address of the other network is greater than this network, | |
489 | // it cannot be a subnet. | |
490 | if (in6_addr_cmp(&self->last_address, &other->last_address) < 0) | |
491 | return 0; | |
492 | ||
493 | return 1; | |
494 | } | |
495 | ||
496 | LOC_EXPORT int loc_network_subnets(struct loc_network* network, | |
497 | struct loc_network** subnet1, struct loc_network** subnet2) { | |
498 | int r; | |
499 | *subnet1 = NULL; | |
500 | *subnet2 = NULL; | |
501 | ||
502 | // New prefix length | |
503 | unsigned int prefix = network->prefix + 1; | |
504 | ||
505 | // Check if the new prefix is valid | |
506 | if (valid_prefix(&network->first_address, prefix)) | |
507 | return -1; | |
508 | ||
509 | // Create the first half of the network | |
510 | r = loc_network_new(network->ctx, subnet1, &network->first_address, prefix); | |
511 | if (r) | |
512 | return r; | |
513 | ||
514 | // The next subnet starts after the first one | |
515 | struct in6_addr first_address = address_increment(&(*subnet1)->last_address); | |
516 | ||
517 | // Create the second half of the network | |
518 | r = loc_network_new(network->ctx, subnet2, &first_address, prefix); | |
519 | if (r) | |
520 | return r; | |
521 | ||
522 | // Copy country code | |
523 | const char* country_code = loc_network_get_country_code(network); | |
524 | if (country_code) { | |
525 | loc_network_set_country_code(*subnet1, country_code); | |
526 | loc_network_set_country_code(*subnet2, country_code); | |
527 | } | |
528 | ||
529 | // Copy ASN | |
530 | uint32_t asn = loc_network_get_asn(network); | |
531 | if (asn) { | |
532 | loc_network_set_asn(*subnet1, asn); | |
533 | loc_network_set_asn(*subnet2, asn); | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static int __loc_network_exclude(struct loc_network* network, | |
540 | struct loc_network* other, struct loc_network_list* list) { | |
541 | struct loc_network* subnet1 = NULL; | |
542 | struct loc_network* subnet2 = NULL; | |
543 | ||
544 | int r = loc_network_subnets(network, &subnet1, &subnet2); | |
545 | if (r) | |
546 | goto ERROR; | |
547 | ||
548 | if (loc_network_cmp(other, subnet1) == 0) { | |
549 | r = loc_network_list_push(list, subnet2); | |
550 | if (r) | |
551 | goto ERROR; | |
552 | ||
553 | } else if (loc_network_cmp(other, subnet2) == 0) { | |
554 | r = loc_network_list_push(list, subnet1); | |
555 | if (r) | |
556 | goto ERROR; | |
557 | ||
558 | } else if (loc_network_is_subnet(subnet1, other)) { | |
559 | r = loc_network_list_push(list, subnet2); | |
560 | if (r) | |
561 | goto ERROR; | |
562 | ||
563 | r = __loc_network_exclude(subnet1, other, list); | |
564 | if (r) | |
565 | goto ERROR; | |
566 | ||
567 | } else if (loc_network_is_subnet(subnet2, other)) { | |
568 | r = loc_network_list_push(list, subnet1); | |
569 | if (r) | |
570 | goto ERROR; | |
571 | ||
572 | r = __loc_network_exclude(subnet2, other, list); | |
573 | if (r) | |
574 | goto ERROR; | |
575 | ||
576 | } else { | |
577 | ERROR(network->ctx, "We should never get here\n"); | |
578 | r = 1; | |
579 | goto ERROR; | |
580 | } | |
581 | ||
582 | ERROR: | |
583 | if (subnet1) | |
584 | loc_network_unref(subnet1); | |
585 | ||
586 | if (subnet2) | |
587 | loc_network_unref(subnet2); | |
588 | ||
589 | return r; | |
590 | } | |
591 | ||
592 | static int __loc_network_exclude_to_list(struct loc_network* self, | |
593 | struct loc_network* other, struct loc_network_list* list) { | |
594 | // Other must be a subnet of self | |
595 | if (!loc_network_is_subnet(self, other)) { | |
596 | DEBUG(self->ctx, "Network %p is not contained in network %p\n", other, self); | |
597 | ||
598 | // Exit silently | |
599 | return 0; | |
600 | } | |
601 | ||
602 | // We cannot perform this operation if both networks equal | |
603 | if (loc_network_cmp(self, other) == 0) { | |
604 | DEBUG(self->ctx, "Networks %p and %p are equal\n", self, other); | |
605 | ||
606 | // Exit silently | |
607 | return 0; | |
608 | } | |
609 | ||
610 | return __loc_network_exclude(self, other, list); | |
611 | } | |
612 | ||
613 | LOC_EXPORT struct loc_network_list* loc_network_exclude( | |
614 | struct loc_network* self, struct loc_network* other) { | |
615 | struct loc_network_list* list; | |
616 | ||
617 | #ifdef ENABLE_DEBUG | |
618 | char* n1 = loc_network_str(self); | |
619 | char* n2 = loc_network_str(other); | |
620 | ||
621 | DEBUG(self->ctx, "Returning %s excluding %s...\n", n1, n2); | |
622 | ||
623 | free(n1); | |
624 | free(n2); | |
625 | #endif | |
626 | ||
627 | // Create a new list with the result | |
628 | int r = loc_network_list_new(self->ctx, &list); | |
629 | if (r) { | |
630 | ERROR(self->ctx, "Could not create network list: %d\n", r); | |
631 | ||
632 | return NULL; | |
633 | } | |
634 | ||
635 | r = __loc_network_exclude_to_list(self, other, list); | |
636 | if (r) { | |
637 | loc_network_list_unref(list); | |
638 | ||
639 | return NULL; | |
640 | } | |
641 | ||
642 | // Return the result | |
643 | return list; | |
644 | } | |
645 | ||
646 | LOC_EXPORT struct loc_network_list* loc_network_exclude_list( | |
647 | struct loc_network* network, struct loc_network_list* list) { | |
648 | struct loc_network_list* to_check; | |
649 | ||
650 | // Create a new list with all networks to look at | |
651 | int r = loc_network_list_new(network->ctx, &to_check); | |
652 | if (r) | |
653 | return NULL; | |
654 | ||
655 | struct loc_network* subnet = NULL; | |
656 | struct loc_network_list* subnets = NULL; | |
657 | ||
658 | for (unsigned int i = 0; i < loc_network_list_size(list); i++) { | |
659 | subnet = loc_network_list_get(list, i); | |
660 | ||
661 | // Find all excluded networks | |
662 | if (!loc_network_list_contains(to_check, subnet)) { | |
663 | r = __loc_network_exclude_to_list(network, subnet, to_check); | |
664 | if (r) { | |
665 | loc_network_list_unref(to_check); | |
666 | loc_network_unref(subnet); | |
667 | ||
668 | return NULL; | |
669 | } | |
670 | } | |
671 | ||
672 | // Cleanup | |
673 | loc_network_unref(subnet); | |
674 | } | |
675 | ||
676 | r = loc_network_list_new(network->ctx, &subnets); | |
677 | if (r) { | |
678 | loc_network_list_unref(to_check); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | while (!loc_network_list_empty(to_check)) { | |
683 | struct loc_network* subnet_to_check = loc_network_list_pop(to_check); | |
684 | ||
685 | // Check whether the subnet to check is part of the input list | |
686 | if (loc_network_list_contains(list, subnet_to_check)) { | |
687 | loc_network_unref(subnet_to_check); | |
688 | continue; | |
689 | } | |
690 | ||
691 | // Marks whether this subnet passed all checks | |
692 | int passed = 1; | |
693 | ||
694 | for (unsigned int i = 0; i < loc_network_list_size(list); i++) { | |
695 | subnet = loc_network_list_get(list, i); | |
696 | ||
697 | // Drop this subnet if is a subnet of another subnet | |
698 | if (loc_network_is_subnet(subnet_to_check, subnet)) { | |
699 | passed = 0; | |
700 | loc_network_unref(subnet); | |
701 | break; | |
702 | } | |
703 | ||
704 | // Break it down if it overlaps | |
705 | if (loc_network_overlaps(subnet_to_check, subnet)) { | |
706 | passed = 0; | |
707 | ||
708 | struct loc_network_list* excluded = loc_network_exclude(subnet_to_check, subnet); | |
709 | if (excluded) { | |
710 | loc_network_list_merge(to_check, excluded); | |
711 | loc_network_list_unref(excluded); | |
712 | } | |
713 | ||
714 | loc_network_unref(subnet); | |
715 | break; | |
716 | } | |
717 | ||
718 | loc_network_unref(subnet); | |
719 | } | |
720 | ||
721 | if (passed) { | |
722 | r = loc_network_list_push(subnets, subnet_to_check); | |
723 | } | |
724 | ||
725 | loc_network_unref(subnet_to_check); | |
726 | } | |
727 | ||
728 | loc_network_list_unref(to_check); | |
729 | ||
730 | // Sort the result | |
731 | loc_network_list_sort(subnets); | |
732 | ||
733 | return subnets; | |
734 | } | |
735 | ||
736 | LOC_EXPORT int loc_network_to_database_v1(struct loc_network* network, struct loc_database_network_v1* dbobj) { | |
737 | // Add country code | |
738 | loc_country_code_copy(dbobj->country_code, network->country_code); | |
739 | ||
740 | // Add ASN | |
741 | dbobj->asn = htobe32(network->asn); | |
742 | ||
743 | // Flags | |
744 | dbobj->flags = htobe16(network->flags); | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | LOC_EXPORT int loc_network_new_from_database_v1(struct loc_ctx* ctx, struct loc_network** network, | |
750 | struct in6_addr* address, unsigned int prefix, const struct loc_database_network_v1* dbobj) { | |
751 | char country_code[3] = "\0\0"; | |
752 | ||
753 | int r = loc_network_new(ctx, network, address, prefix); | |
754 | if (r) { | |
755 | ERROR(ctx, "Could not allocate a new network: %s", strerror(-r)); | |
756 | return r; | |
757 | } | |
758 | ||
759 | // Import country code | |
760 | loc_country_code_copy(country_code, dbobj->country_code); | |
761 | ||
762 | r = loc_network_set_country_code(*network, country_code); | |
763 | if (r) { | |
764 | ERROR(ctx, "Could not set country code: %s\n", country_code); | |
765 | return r; | |
766 | } | |
767 | ||
768 | // Import ASN | |
769 | uint32_t asn = be32toh(dbobj->asn); | |
770 | r = loc_network_set_asn(*network, asn); | |
771 | if (r) { | |
772 | ERROR(ctx, "Could not set ASN: %d\n", asn); | |
773 | return r; | |
774 | } | |
775 | ||
776 | // Import flags | |
777 | int flags = be16toh(dbobj->flags); | |
778 | r = loc_network_set_flag(*network, flags); | |
779 | if (r) { | |
780 | ERROR(ctx, "Could not set flags: %d\n", flags); | |
781 | return r; | |
782 | } | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
787 | struct loc_network_tree { | |
788 | struct loc_ctx* ctx; | |
789 | int refcount; | |
790 | ||
791 | struct loc_network_tree_node* root; | |
792 | }; | |
793 | ||
794 | struct loc_network_tree_node { | |
795 | struct loc_ctx* ctx; | |
796 | int refcount; | |
797 | ||
798 | struct loc_network_tree_node* zero; | |
799 | struct loc_network_tree_node* one; | |
800 | ||
801 | struct loc_network* network; | |
802 | }; | |
803 | ||
804 | int loc_network_tree_new(struct loc_ctx* ctx, struct loc_network_tree** tree) { | |
805 | struct loc_network_tree* t = calloc(1, sizeof(*t)); | |
806 | if (!t) | |
807 | return -ENOMEM; | |
808 | ||
809 | t->ctx = loc_ref(ctx); | |
810 | t->refcount = 1; | |
811 | ||
812 | // Create the root node | |
813 | int r = loc_network_tree_node_new(ctx, &t->root); | |
814 | if (r) { | |
815 | loc_network_tree_unref(t); | |
816 | return r; | |
817 | } | |
818 | ||
819 | DEBUG(t->ctx, "Network tree allocated at %p\n", t); | |
820 | *tree = t; | |
821 | return 0; | |
822 | } | |
823 | ||
824 | struct loc_network_tree_node* loc_network_tree_get_root(struct loc_network_tree* tree) { | |
825 | return loc_network_tree_node_ref(tree->root); | |
826 | } | |
827 | ||
828 | static struct loc_network_tree_node* loc_network_tree_get_node(struct loc_network_tree_node* node, int path) { | |
829 | struct loc_network_tree_node** n; | |
830 | ||
831 | if (path == 0) | |
832 | n = &node->zero; | |
833 | else | |
834 | n = &node->one; | |
835 | ||
836 | // If the desired node doesn't exist, yet, we will create it | |
837 | if (*n == NULL) { | |
838 | int r = loc_network_tree_node_new(node->ctx, n); | |
839 | if (r) | |
840 | return NULL; | |
841 | } | |
842 | ||
843 | return *n; | |
844 | } | |
845 | ||
846 | static struct loc_network_tree_node* loc_network_tree_get_path(struct loc_network_tree* tree, const struct in6_addr* address, unsigned int prefix) { | |
847 | struct loc_network_tree_node* node = tree->root; | |
848 | ||
849 | for (unsigned int i = 0; i < prefix; i++) { | |
850 | // Check if the ith bit is one or zero | |
851 | node = loc_network_tree_get_node(node, in6_addr_get_bit(address, i)); | |
852 | } | |
853 | ||
854 | return node; | |
855 | } | |
856 | ||
857 | static int __loc_network_tree_walk(struct loc_ctx* ctx, struct loc_network_tree_node* node, | |
858 | int(*filter_callback)(struct loc_network* network, void* data), | |
859 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
860 | int r; | |
861 | ||
862 | // Finding a network ends the walk here | |
863 | if (node->network) { | |
864 | if (filter_callback) { | |
865 | int f = filter_callback(node->network, data); | |
866 | if (f < 0) | |
867 | return f; | |
868 | ||
869 | // Skip network if filter function returns value greater than zero | |
870 | if (f > 0) | |
871 | return 0; | |
872 | } | |
873 | ||
874 | r = callback(node->network, data); | |
875 | if (r) | |
876 | return r; | |
877 | } | |
878 | ||
879 | // Walk down on the left side of the tree first | |
880 | if (node->zero) { | |
881 | r = __loc_network_tree_walk(ctx, node->zero, filter_callback, callback, data); | |
882 | if (r) | |
883 | return r; | |
884 | } | |
885 | ||
886 | // Then walk on the other side | |
887 | if (node->one) { | |
888 | r = __loc_network_tree_walk(ctx, node->one, filter_callback, callback, data); | |
889 | if (r) | |
890 | return r; | |
891 | } | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | int loc_network_tree_walk(struct loc_network_tree* tree, | |
897 | int(*filter_callback)(struct loc_network* network, void* data), | |
898 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
899 | return __loc_network_tree_walk(tree->ctx, tree->root, filter_callback, callback, data); | |
900 | } | |
901 | ||
902 | static void loc_network_tree_free(struct loc_network_tree* tree) { | |
903 | DEBUG(tree->ctx, "Releasing network tree at %p\n", tree); | |
904 | ||
905 | loc_network_tree_node_unref(tree->root); | |
906 | ||
907 | loc_unref(tree->ctx); | |
908 | free(tree); | |
909 | } | |
910 | ||
911 | struct loc_network_tree* loc_network_tree_unref(struct loc_network_tree* tree) { | |
912 | if (--tree->refcount > 0) | |
913 | return tree; | |
914 | ||
915 | loc_network_tree_free(tree); | |
916 | return NULL; | |
917 | } | |
918 | ||
919 | static int __loc_network_tree_dump(struct loc_network* network, void* data) { | |
920 | DEBUG(network->ctx, "Dumping network at %p\n", network); | |
921 | ||
922 | char* s = loc_network_str(network); | |
923 | if (!s) | |
924 | return 1; | |
925 | ||
926 | INFO(network->ctx, "%s\n", s); | |
927 | free(s); | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
932 | int loc_network_tree_dump(struct loc_network_tree* tree) { | |
933 | DEBUG(tree->ctx, "Dumping network tree at %p\n", tree); | |
934 | ||
935 | return loc_network_tree_walk(tree, NULL, __loc_network_tree_dump, NULL); | |
936 | } | |
937 | ||
938 | int loc_network_tree_add_network(struct loc_network_tree* tree, struct loc_network* network) { | |
939 | DEBUG(tree->ctx, "Adding network %p to tree %p\n", network, tree); | |
940 | ||
941 | struct loc_network_tree_node* node = loc_network_tree_get_path(tree, | |
942 | &network->first_address, network->prefix); | |
943 | if (!node) { | |
944 | ERROR(tree->ctx, "Could not find a node\n"); | |
945 | return -ENOMEM; | |
946 | } | |
947 | ||
948 | // Check if node has not been set before | |
949 | if (node->network) { | |
950 | DEBUG(tree->ctx, "There is already a network at this path\n"); | |
951 | return -EBUSY; | |
952 | } | |
953 | ||
954 | // Point node to the network | |
955 | node->network = loc_network_ref(network); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static int __loc_network_tree_count(struct loc_network* network, void* data) { | |
961 | size_t* counter = (size_t*)data; | |
962 | ||
963 | // Increase the counter for each network | |
964 | counter++; | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
969 | size_t loc_network_tree_count_networks(struct loc_network_tree* tree) { | |
970 | size_t counter = 0; | |
971 | ||
972 | int r = loc_network_tree_walk(tree, NULL, __loc_network_tree_count, &counter); | |
973 | if (r) | |
974 | return r; | |
975 | ||
976 | return counter; | |
977 | } | |
978 | ||
979 | static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node* node) { | |
980 | size_t counter = 1; | |
981 | ||
982 | if (node->zero) | |
983 | counter += __loc_network_tree_count_nodes(node->zero); | |
984 | ||
985 | if (node->one) | |
986 | counter += __loc_network_tree_count_nodes(node->one); | |
987 | ||
988 | return counter; | |
989 | } | |
990 | ||
991 | size_t loc_network_tree_count_nodes(struct loc_network_tree* tree) { | |
992 | return __loc_network_tree_count_nodes(tree->root); | |
993 | } | |
994 | ||
995 | int loc_network_tree_node_new(struct loc_ctx* ctx, struct loc_network_tree_node** node) { | |
996 | struct loc_network_tree_node* n = calloc(1, sizeof(*n)); | |
997 | if (!n) | |
998 | return -ENOMEM; | |
999 | ||
1000 | n->ctx = loc_ref(ctx); | |
1001 | n->refcount = 1; | |
1002 | ||
1003 | n->zero = n->one = NULL; | |
1004 | ||
1005 | DEBUG(n->ctx, "Network node allocated at %p\n", n); | |
1006 | *node = n; | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | struct loc_network_tree_node* loc_network_tree_node_ref(struct loc_network_tree_node* node) { | |
1011 | if (node) | |
1012 | node->refcount++; | |
1013 | ||
1014 | return node; | |
1015 | } | |
1016 | ||
1017 | static void loc_network_tree_node_free(struct loc_network_tree_node* node) { | |
1018 | DEBUG(node->ctx, "Releasing network node at %p\n", node); | |
1019 | ||
1020 | if (node->network) | |
1021 | loc_network_unref(node->network); | |
1022 | ||
1023 | if (node->zero) | |
1024 | loc_network_tree_node_unref(node->zero); | |
1025 | ||
1026 | if (node->one) | |
1027 | loc_network_tree_node_unref(node->one); | |
1028 | ||
1029 | loc_unref(node->ctx); | |
1030 | free(node); | |
1031 | } | |
1032 | ||
1033 | struct loc_network_tree_node* loc_network_tree_node_unref(struct loc_network_tree_node* node) { | |
1034 | if (!node) | |
1035 | return NULL; | |
1036 | ||
1037 | if (--node->refcount > 0) | |
1038 | return node; | |
1039 | ||
1040 | loc_network_tree_node_free(node); | |
1041 | return NULL; | |
1042 | } | |
1043 | ||
1044 | struct loc_network_tree_node* loc_network_tree_node_get(struct loc_network_tree_node* node, unsigned int index) { | |
1045 | if (index == 0) | |
1046 | node = node->zero; | |
1047 | else | |
1048 | node = node->one; | |
1049 | ||
1050 | if (!node) | |
1051 | return NULL; | |
1052 | ||
1053 | return loc_network_tree_node_ref(node); | |
1054 | } | |
1055 | ||
1056 | int loc_network_tree_node_is_leaf(struct loc_network_tree_node* node) { | |
1057 | return (!!node->network); | |
1058 | } | |
1059 | ||
1060 | struct loc_network* loc_network_tree_node_get_network(struct loc_network_tree_node* node) { | |
1061 | return loc_network_ref(node->network); | |
1062 | } |