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Commit | Line | Data |
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3b5f4af2 MT |
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> | |
71ff3e69 | 20 | #include <stdio.h> |
3b5f4af2 MT |
21 | #include <stdlib.h> |
22 | #include <string.h> | |
23 | ||
42f3ccd7 MT |
24 | #ifdef HAVE_ENDIAN_H |
25 | # include <endian.h> | |
26 | #endif | |
27 | ||
3b5f4af2 | 28 | #include <loc/libloc.h> |
42f3ccd7 | 29 | #include <loc/compat.h> |
57146963 | 30 | #include <loc/country.h> |
3b5f4af2 | 31 | #include <loc/network.h> |
e0b9ff5f | 32 | #include <loc/network-list.h> |
9fc7f001 | 33 | #include <loc/private.h> |
3b5f4af2 MT |
34 | |
35 | struct loc_network { | |
36 | struct loc_ctx* ctx; | |
37 | int refcount; | |
38 | ||
c3068be1 | 39 | int family; |
ce4f5752 | 40 | struct in6_addr first_address; |
b43edb61 | 41 | struct in6_addr last_address; |
3b5f4af2 MT |
42 | unsigned int prefix; |
43 | ||
44 | char country_code[3]; | |
71ff3e69 | 45 | uint32_t asn; |
a293f829 | 46 | enum loc_network_flags flags; |
3b5f4af2 MT |
47 | }; |
48 | ||
6183c0f2 MT |
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 | ||
aa37232a MT |
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 | ||
6183c0f2 MT |
62 | return 0; |
63 | } | |
64 | ||
a82ce8bc MT |
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 | ||
364a2a37 | 71 | for (int i = prefix, j = 0; i > 0; i -= 8, j++) { |
a82ce8bc MT |
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 | ||
b43edb61 | 81 | static struct in6_addr make_first_address(const struct in6_addr* address, const struct in6_addr* bitmask) { |
a82ce8bc | 82 | struct in6_addr a; |
a82ce8bc MT |
83 | |
84 | // Perform bitwise AND | |
85 | for (unsigned int i = 0; i < 4; i++) | |
b43edb61 | 86 | a.s6_addr32[i] = address->s6_addr32[i] & bitmask->s6_addr32[i]; |
a82ce8bc MT |
87 | |
88 | return a; | |
89 | } | |
90 | ||
b43edb61 | 91 | static struct in6_addr make_last_address(const struct in6_addr* address, const struct in6_addr* bitmask) { |
2a30e4de | 92 | struct in6_addr a; |
2a30e4de MT |
93 | |
94 | // Perform bitwise OR | |
95 | for (unsigned int i = 0; i < 4; i++) | |
b43edb61 | 96 | a.s6_addr32[i] = address->s6_addr32[i] | ~bitmask->s6_addr32[i]; |
2a30e4de MT |
97 | |
98 | return a; | |
99 | } | |
100 | ||
850e7516 MT |
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 | ||
3b5f4af2 | 116 | LOC_EXPORT int loc_network_new(struct loc_ctx* ctx, struct loc_network** network, |
10778041 | 117 | struct in6_addr* address, unsigned int prefix) { |
3b5f4af2 | 118 | // Address cannot be unspecified |
bca87342 | 119 | if (IN6_IS_ADDR_UNSPECIFIED(address)) { |
3b5f4af2 MT |
120 | DEBUG(ctx, "Start address is unspecified\n"); |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | // Address cannot be loopback | |
bca87342 | 125 | if (IN6_IS_ADDR_LOOPBACK(address)) { |
3b5f4af2 MT |
126 | DEBUG(ctx, "Start address is loopback address\n"); |
127 | return -EINVAL; | |
128 | } | |
129 | ||
130 | // Address cannot be link-local | |
bca87342 | 131 | if (IN6_IS_ADDR_LINKLOCAL(address)) { |
3b5f4af2 MT |
132 | DEBUG(ctx, "Start address cannot be link-local\n"); |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | // Address cannot be site-local | |
bca87342 | 137 | if (IN6_IS_ADDR_SITELOCAL(address)) { |
3b5f4af2 MT |
138 | DEBUG(ctx, "Start address cannot be site-local\n"); |
139 | return -EINVAL; | |
140 | } | |
141 | ||
6183c0f2 | 142 | // Validate the prefix |
10778041 | 143 | if (valid_prefix(address, prefix) != 0) { |
6183c0f2 MT |
144 | DEBUG(ctx, "Invalid prefix: %u\n", prefix); |
145 | return -EINVAL; | |
146 | } | |
147 | ||
3b5f4af2 MT |
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 | ||
b43edb61 | 155 | // Store the prefix |
3b5f4af2 MT |
156 | n->prefix = prefix; |
157 | ||
b43edb61 MT |
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 | ||
c3068be1 MT |
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 | ||
3b5f4af2 MT |
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) { | |
ce4f5752 | 178 | struct in6_addr first_address; |
3b5f4af2 | 179 | char* prefix_string; |
26ab419b | 180 | unsigned int prefix = 128; |
13ad6e69 MT |
181 | int r = -EINVAL; |
182 | ||
183 | DEBUG(ctx, "Attempting to parse network %s\n", address_string); | |
3b5f4af2 MT |
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 | ||
13ad6e69 MT |
192 | DEBUG(ctx, " Split into address = %s, prefix = %s\n", address_string, prefix_string); |
193 | ||
13ad6e69 MT |
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; | |
b61f14fc | 199 | } |
3b5f4af2 | 200 | |
26ab419b MT |
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 | } | |
13ad6e69 MT |
215 | |
216 | FAIL: | |
3b5f4af2 MT |
217 | // Free temporary buffer |
218 | free(buffer); | |
219 | ||
13ad6e69 MT |
220 | // Exit if the parsing was unsuccessful |
221 | if (r) | |
222 | return r; | |
223 | ||
13ad6e69 MT |
224 | // Create a new network |
225 | return loc_network_new(ctx, network, &first_address, prefix); | |
3b5f4af2 MT |
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 | ||
3b5f4af2 MT |
237 | loc_unref(network->ctx); |
238 | free(network); | |
239 | } | |
240 | ||
241 | LOC_EXPORT struct loc_network* loc_network_unref(struct loc_network* network) { | |
2a30e4de MT |
242 | if (!network) |
243 | return NULL; | |
244 | ||
3b5f4af2 MT |
245 | if (--network->refcount > 0) |
246 | return network; | |
247 | ||
248 | loc_network_free(network); | |
249 | return NULL; | |
250 | } | |
251 | ||
8fb874e9 MT |
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); | |
d3409788 MT |
254 | if (!ret) |
255 | return -1; | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
8fb874e9 | 260 | static int format_ipv4_address(const struct in6_addr* address, char* string, size_t length) { |
d3409788 | 261 | struct in_addr ipv4_address; |
8fb874e9 | 262 | ipv4_address.s_addr = address->s6_addr32[3]; |
d3409788 MT |
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 | ||
3b5f4af2 | 271 | LOC_EXPORT char* loc_network_str(struct loc_network* network) { |
d3409788 MT |
272 | int r; |
273 | const size_t length = INET6_ADDRSTRLEN + 4; | |
3b5f4af2 | 274 | |
d3409788 | 275 | char* string = malloc(length); |
3b5f4af2 MT |
276 | if (!string) |
277 | return NULL; | |
278 | ||
aa37232a MT |
279 | unsigned int prefix = network->prefix; |
280 | ||
c3068be1 | 281 | switch (network->family) { |
d3409788 | 282 | case AF_INET6: |
ce4f5752 | 283 | r = format_ipv6_address(&network->first_address, string, length); |
d3409788 | 284 | break; |
3b5f4af2 | 285 | |
d3409788 | 286 | case AF_INET: |
ce4f5752 | 287 | r = format_ipv4_address(&network->first_address, string, length); |
aa37232a | 288 | prefix -= 96; |
d3409788 MT |
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)); | |
3b5f4af2 | 298 | free(string); |
d3409788 | 299 | |
3b5f4af2 MT |
300 | return NULL; |
301 | } | |
302 | ||
303 | // Append prefix | |
aa37232a | 304 | sprintf(string + strlen(string), "/%u", prefix); |
3b5f4af2 MT |
305 | |
306 | return string; | |
307 | } | |
308 | ||
44e5ef71 | 309 | LOC_EXPORT int loc_network_address_family(struct loc_network* network) { |
c3068be1 | 310 | return network->family; |
44e5ef71 MT |
311 | } |
312 | ||
2b9338ea MT |
313 | static char* loc_network_format_address(struct loc_network* network, const struct in6_addr* address) { |
314 | const size_t length = INET6_ADDRSTRLEN; | |
315 | ||
316 | char* string = malloc(length); | |
317 | if (!string) | |
318 | return NULL; | |
319 | ||
320 | int r = 0; | |
321 | ||
c3068be1 | 322 | switch (network->family) { |
2b9338ea MT |
323 | case AF_INET6: |
324 | r = format_ipv6_address(address, string, length); | |
325 | break; | |
326 | ||
327 | case AF_INET: | |
328 | r = format_ipv4_address(address, string, length); | |
329 | break; | |
330 | ||
331 | default: | |
332 | r = -1; | |
333 | break; | |
334 | } | |
335 | ||
336 | if (r) { | |
337 | ERROR(network->ctx, "Could not format IP address to string: %s\n", strerror(errno)); | |
338 | free(string); | |
339 | ||
340 | return NULL; | |
341 | } | |
342 | ||
343 | return string; | |
344 | } | |
345 | ||
346 | LOC_EXPORT char* loc_network_format_first_address(struct loc_network* network) { | |
347 | return loc_network_format_address(network, &network->first_address); | |
348 | } | |
349 | ||
350 | LOC_EXPORT char* loc_network_format_last_address(struct loc_network* network) { | |
351 | return loc_network_format_address(network, &network->last_address); | |
352 | } | |
353 | ||
2a30e4de | 354 | LOC_EXPORT int loc_network_match_address(struct loc_network* network, const struct in6_addr* address) { |
f50adb09 | 355 | // Address must be larger than the start address |
ce4f5752 | 356 | if (in6_addr_cmp(&network->first_address, address) > 0) |
2a30e4de MT |
357 | return 1; |
358 | ||
2a30e4de | 359 | // Address must be smaller than the last address |
b43edb61 | 360 | if (in6_addr_cmp(&network->last_address, address) < 0) |
2a30e4de MT |
361 | return 1; |
362 | ||
363 | // The address is inside this network | |
364 | return 0; | |
365 | } | |
366 | ||
3b5f4af2 MT |
367 | LOC_EXPORT const char* loc_network_get_country_code(struct loc_network* network) { |
368 | return network->country_code; | |
369 | } | |
370 | ||
371 | LOC_EXPORT int loc_network_set_country_code(struct loc_network* network, const char* country_code) { | |
901ef882 MT |
372 | // Set empty country code |
373 | if (!country_code || !*country_code) { | |
374 | *network->country_code = '\0'; | |
375 | return 0; | |
376 | } | |
377 | ||
57146963 MT |
378 | // Check country code |
379 | if (!loc_country_code_is_valid(country_code)) | |
3b5f4af2 MT |
380 | return -EINVAL; |
381 | ||
a7a3d958 | 382 | loc_country_code_copy(network->country_code, country_code); |
3b5f4af2 MT |
383 | |
384 | return 0; | |
385 | } | |
386 | ||
e3f696c1 | 387 | LOC_EXPORT int loc_network_match_country_code(struct loc_network* network, const char* country_code) { |
57146963 MT |
388 | // Check country code |
389 | if (!loc_country_code_is_valid(country_code)) | |
e3f696c1 MT |
390 | return -EINVAL; |
391 | ||
392 | return (network->country_code[0] == country_code[0]) | |
393 | && (network->country_code[1] == country_code[1]); | |
394 | } | |
395 | ||
71ff3e69 MT |
396 | LOC_EXPORT uint32_t loc_network_get_asn(struct loc_network* network) { |
397 | return network->asn; | |
398 | } | |
399 | ||
400 | LOC_EXPORT int loc_network_set_asn(struct loc_network* network, uint32_t asn) { | |
401 | network->asn = asn; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
82910b95 MT |
406 | LOC_EXPORT int loc_network_match_asn(struct loc_network* network, uint32_t asn) { |
407 | return network->asn == asn; | |
408 | } | |
409 | ||
a99e7c2b MT |
410 | LOC_EXPORT int loc_network_has_flag(struct loc_network* network, uint32_t flag) { |
411 | return network->flags & flag; | |
412 | } | |
413 | ||
414 | LOC_EXPORT int loc_network_set_flag(struct loc_network* network, uint32_t flag) { | |
415 | network->flags |= flag; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | LOC_EXPORT int loc_network_match_flag(struct loc_network* network, uint32_t flag) { | |
421 | return loc_network_has_flag(network, flag); | |
422 | } | |
423 | ||
850e7516 | 424 | LOC_EXPORT int loc_network_eq(struct loc_network* self, struct loc_network* other) { |
850e7516 | 425 | // Family must be the same |
f5e50a47 | 426 | if (self->family != other->family) |
850e7516 | 427 | return 0; |
850e7516 MT |
428 | |
429 | // The start address must be the same | |
f5e50a47 | 430 | if (in6_addr_cmp(&self->first_address, &other->first_address) != 0) |
850e7516 | 431 | return 0; |
850e7516 MT |
432 | |
433 | // The prefix length must be the same | |
f5e50a47 | 434 | if (self->prefix != other->prefix) |
850e7516 | 435 | return 0; |
850e7516 MT |
436 | |
437 | return 1; | |
438 | } | |
439 | ||
e0b9ff5f | 440 | LOC_EXPORT int loc_network_gt(struct loc_network* self, struct loc_network* other) { |
850e7516 MT |
441 | // Families must match |
442 | if (self->family != other->family) | |
443 | return -1; | |
444 | ||
445 | int r = in6_addr_cmp(&self->first_address, &other->first_address); | |
446 | ||
447 | switch (r) { | |
448 | // Smaller | |
449 | case -1: | |
450 | return 0; | |
451 | ||
452 | // Larger | |
453 | case 1: | |
454 | return 1; | |
455 | ||
456 | default: | |
457 | break; | |
458 | } | |
459 | ||
460 | if (self->prefix > other->prefix) | |
461 | return 1; | |
462 | ||
463 | // Dunno | |
464 | return 0; | |
465 | } | |
466 | ||
6159d384 MT |
467 | LOC_EXPORT int loc_network_overlaps(struct loc_network* self, struct loc_network* other) { |
468 | if (loc_network_match_address(self, &other->first_address) == 0) | |
469 | return 1; | |
470 | ||
471 | if (loc_network_match_address(self, &other->last_address) == 0) | |
472 | return 1; | |
473 | ||
474 | if (loc_network_match_address(other, &self->first_address) == 0) | |
475 | return 1; | |
476 | ||
477 | if (loc_network_match_address(other, &self->last_address) == 0) | |
478 | return 1; | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
33a051e0 MT |
483 | LOC_EXPORT int loc_network_is_subnet(struct loc_network* self, struct loc_network* other) { |
484 | // If the start address of the other network is smaller than this network, | |
485 | // it cannot be a subnet. | |
486 | if (in6_addr_cmp(&self->first_address, &other->first_address) < 0) | |
487 | return 0; | |
488 | ||
489 | // If the end address of the other network is greater than this network, | |
490 | // it cannot be a subnet. | |
491 | if (in6_addr_cmp(&self->last_address, &other->last_address) > 0) | |
492 | return 0; | |
493 | ||
494 | return 1; | |
495 | } | |
496 | ||
497 | // XXX DEPRECATED - I find this too difficult to use | |
43554dc4 MT |
498 | LOC_EXPORT int loc_network_is_subnet_of(struct loc_network* self, struct loc_network* other) { |
499 | // If the start address of the other network is smaller than this network, | |
500 | // it cannot be a subnet. | |
ce4f5752 | 501 | if (in6_addr_cmp(&self->first_address, &other->first_address) < 0) |
43554dc4 MT |
502 | return 0; |
503 | ||
43554dc4 MT |
504 | // If the end address of the other network is greater than this network, |
505 | // it cannot be a subnet. | |
b43edb61 | 506 | if (in6_addr_cmp(&self->last_address, &other->last_address) > 0) |
43554dc4 MT |
507 | return 0; |
508 | ||
509 | return 1; | |
510 | } | |
511 | ||
850e7516 MT |
512 | LOC_EXPORT struct loc_network_list* loc_network_subnets(struct loc_network* network) { |
513 | struct loc_network_list* list; | |
514 | ||
515 | // New prefix length | |
516 | unsigned int prefix = network->prefix + 1; | |
517 | ||
518 | // Check if the new prefix is valid | |
519 | if (valid_prefix(&network->first_address, prefix)) | |
520 | return NULL; | |
521 | ||
522 | // Create a new list with the result | |
523 | int r = loc_network_list_new(network->ctx, &list); | |
524 | if (r) { | |
525 | ERROR(network->ctx, "Could not create network list: %d\n", r); | |
526 | return NULL; | |
527 | } | |
528 | ||
529 | struct loc_network* subnet1 = NULL; | |
530 | struct loc_network* subnet2 = NULL; | |
531 | ||
532 | // Create the first half of the network | |
533 | r = loc_network_new(network->ctx, &subnet1, &network->first_address, prefix); | |
534 | if (r) | |
535 | goto ERROR; | |
536 | ||
537 | // The next subnet starts after the first one | |
538 | struct in6_addr first_address = address_increment(&subnet1->last_address); | |
539 | ||
540 | // Create the second half of the network | |
541 | r = loc_network_new(network->ctx, &subnet2, &first_address, prefix); | |
542 | if (r) | |
543 | goto ERROR; | |
544 | ||
545 | // Push the both onto the stack (in reverse order) | |
546 | r = loc_network_list_push(list, subnet2); | |
547 | if (r) | |
548 | goto ERROR; | |
549 | ||
550 | r = loc_network_list_push(list, subnet1); | |
551 | if (r) | |
552 | goto ERROR; | |
553 | ||
594ca328 MT |
554 | // Copy country code |
555 | const char* country_code = loc_network_get_country_code(network); | |
556 | if (country_code) { | |
557 | loc_network_set_country_code(subnet1, country_code); | |
558 | loc_network_set_country_code(subnet2, country_code); | |
559 | } | |
560 | ||
561 | // Copy ASN | |
562 | uint32_t asn = loc_network_get_asn(network); | |
563 | if (asn) { | |
564 | loc_network_set_asn(subnet1, asn); | |
565 | loc_network_set_asn(subnet2, asn); | |
566 | } | |
567 | ||
850e7516 MT |
568 | loc_network_unref(subnet1); |
569 | loc_network_unref(subnet2); | |
570 | ||
571 | return list; | |
572 | ||
573 | ERROR: | |
574 | if (subnet1) | |
575 | loc_network_unref(subnet1); | |
576 | ||
577 | if (subnet2) | |
578 | loc_network_unref(subnet2); | |
579 | ||
580 | if (list) | |
581 | loc_network_list_unref(list); | |
582 | ||
583 | return NULL; | |
584 | } | |
585 | ||
586 | LOC_EXPORT struct loc_network_list* loc_network_exclude( | |
587 | struct loc_network* self, struct loc_network* other) { | |
588 | struct loc_network_list* list; | |
589 | ||
590 | #ifdef ENABLE_DEBUG | |
591 | char* n1 = loc_network_str(self); | |
592 | char* n2 = loc_network_str(other); | |
593 | ||
594 | DEBUG(self->ctx, "Returning %s excluding %s...\n", n1, n2); | |
595 | ||
596 | free(n1); | |
597 | free(n2); | |
598 | #endif | |
599 | ||
600 | // Family must match | |
601 | if (self->family != other->family) { | |
602 | DEBUG(self->ctx, "Family mismatch\n"); | |
603 | ||
604 | return NULL; | |
605 | } | |
606 | ||
607 | // Other must be a subnet of self | |
608 | if (!loc_network_is_subnet_of(other, self)) { | |
609 | DEBUG(self->ctx, "Network %p is not contained in network %p\n", other, self); | |
610 | ||
611 | return NULL; | |
612 | } | |
613 | ||
614 | // We cannot perform this operation if both networks equal | |
615 | if (loc_network_eq(self, other)) { | |
616 | DEBUG(self->ctx, "Networks %p and %p are equal\n", self, other); | |
617 | ||
618 | return NULL; | |
619 | } | |
620 | ||
621 | // Create a new list with the result | |
622 | int r = loc_network_list_new(self->ctx, &list); | |
623 | if (r) { | |
624 | ERROR(self->ctx, "Could not create network list: %d\n", r); | |
625 | return NULL; | |
626 | } | |
627 | ||
628 | struct loc_network_list* subnets = loc_network_subnets(self); | |
629 | ||
630 | struct loc_network* subnet1 = NULL; | |
631 | struct loc_network* subnet2 = NULL; | |
632 | ||
633 | while (subnets) { | |
634 | // Fetch both subnets | |
635 | subnet1 = loc_network_list_get(subnets, 0); | |
636 | subnet2 = loc_network_list_get(subnets, 1); | |
637 | ||
638 | // Free list | |
639 | loc_network_list_unref(subnets); | |
640 | subnets = NULL; | |
641 | ||
642 | if (loc_network_eq(other, subnet1)) { | |
643 | r = loc_network_list_push(list, subnet2); | |
644 | if (r) | |
645 | goto ERROR; | |
646 | ||
647 | } else if (loc_network_eq(other, subnet2)) { | |
648 | r = loc_network_list_push(list, subnet1); | |
649 | if (r) | |
650 | goto ERROR; | |
651 | ||
652 | } else if (loc_network_is_subnet_of(other, subnet1)) { | |
653 | r = loc_network_list_push(list, subnet2); | |
654 | if (r) | |
655 | goto ERROR; | |
656 | ||
657 | subnets = loc_network_subnets(subnet1); | |
658 | ||
659 | } else if (loc_network_is_subnet_of(other, subnet2)) { | |
660 | r = loc_network_list_push(list, subnet1); | |
661 | if (r) | |
662 | goto ERROR; | |
663 | ||
664 | subnets = loc_network_subnets(subnet2); | |
665 | ||
666 | } else { | |
667 | ERROR(self->ctx, "We should never get here\n"); | |
668 | goto ERROR; | |
669 | } | |
670 | ||
671 | loc_network_unref(subnet1); | |
672 | loc_network_unref(subnet2); | |
673 | } | |
674 | ||
675 | #ifdef ENABLE_DEBUG | |
676 | loc_network_list_dump(list); | |
677 | #endif | |
678 | ||
679 | // Return the result | |
680 | return list; | |
681 | ||
682 | ERROR: | |
683 | if (subnet1) | |
684 | loc_network_unref(subnet1); | |
685 | ||
686 | if (subnet2) | |
687 | loc_network_unref(subnet2); | |
688 | ||
689 | if (list) | |
690 | loc_network_list_unref(list); | |
691 | ||
692 | return NULL; | |
693 | } | |
694 | ||
add5bb65 MT |
695 | LOC_EXPORT struct loc_network_list* loc_network_exclude_list( |
696 | struct loc_network* network, struct loc_network_list* list) { | |
697 | struct loc_network_list* to_check; | |
698 | ||
699 | // Create a new list with all networks to look at | |
700 | int r = loc_network_list_new(network->ctx, &to_check); | |
701 | if (r) | |
702 | return NULL; | |
703 | ||
704 | struct loc_network* subnet = NULL; | |
705 | struct loc_network_list* subnets = NULL; | |
706 | ||
707 | for (unsigned int i = 0; i < loc_network_list_size(list); i++) { | |
708 | subnet = loc_network_list_get(list, i); | |
709 | ||
710 | // Find all excluded networks | |
711 | struct loc_network_list* excluded = loc_network_exclude(network, subnet); | |
712 | if (excluded) { | |
713 | // Add them all to the "to check" list | |
714 | loc_network_list_merge(to_check, excluded); | |
715 | loc_network_list_unref(excluded); | |
716 | } | |
717 | ||
718 | // Cleanup | |
719 | loc_network_unref(subnet); | |
720 | } | |
721 | ||
722 | r = loc_network_list_new(network->ctx, &subnets); | |
723 | if (r) { | |
724 | loc_network_list_unref(to_check); | |
725 | return NULL; | |
726 | } | |
727 | ||
728 | while (!loc_network_list_empty(to_check)) { | |
729 | struct loc_network* subnet_to_check = loc_network_list_pop(to_check); | |
730 | ||
731 | // Marks whether this subnet passed all checks | |
732 | int passed = 1; | |
733 | ||
734 | for (unsigned int i = 0; i < loc_network_list_size(list); i++) { | |
735 | subnet = loc_network_list_get(list, i); | |
736 | ||
737 | // Drop this subnet if is is already in list | |
738 | if (loc_network_eq(subnet_to_check, subnet)) { | |
739 | passed = 0; | |
740 | loc_network_unref(subnet); | |
741 | break; | |
742 | } | |
743 | ||
744 | // Drop this subnet if is a subnet of another subnet | |
745 | if (loc_network_is_subnet_of(subnet, subnet_to_check)) { | |
746 | passed = 0; | |
747 | loc_network_unref(subnet); | |
748 | break; | |
749 | } | |
750 | ||
751 | // Break it down if it overlaps | |
752 | if (loc_network_overlaps(subnet_to_check, subnet)) { | |
753 | passed = 0; | |
754 | ||
755 | struct loc_network_list* excluded = loc_network_exclude(subnet_to_check, subnet); | |
756 | if (excluded) { | |
757 | loc_network_list_merge(to_check, excluded); | |
758 | loc_network_list_unref(excluded); | |
759 | } | |
760 | ||
761 | loc_network_unref(subnet); | |
762 | break; | |
763 | } | |
764 | ||
765 | loc_network_unref(subnet); | |
766 | } | |
767 | ||
768 | if (passed) { | |
769 | r = loc_network_list_push(subnets, subnet_to_check); | |
770 | } | |
771 | ||
772 | loc_network_unref(subnet_to_check); | |
773 | } | |
774 | ||
775 | loc_network_list_unref(to_check); | |
776 | ||
d3375368 MT |
777 | // Sort the result |
778 | loc_network_list_sort(subnets); | |
779 | ||
add5bb65 MT |
780 | return subnets; |
781 | } | |
782 | ||
b904896a | 783 | LOC_EXPORT int loc_network_to_database_v1(struct loc_network* network, struct loc_database_network_v1* dbobj) { |
f3e02bc5 | 784 | // Add country code |
a7a3d958 | 785 | loc_country_code_copy(dbobj->country_code, network->country_code); |
f3e02bc5 MT |
786 | |
787 | // Add ASN | |
71ff3e69 | 788 | dbobj->asn = htobe32(network->asn); |
f3e02bc5 | 789 | |
a99e7c2b | 790 | // Flags |
eee6346d | 791 | dbobj->flags = htobe16(network->flags); |
a99e7c2b | 792 | |
f3e02bc5 MT |
793 | return 0; |
794 | } | |
795 | ||
b904896a MT |
796 | LOC_EXPORT int loc_network_new_from_database_v1(struct loc_ctx* ctx, struct loc_network** network, |
797 | struct in6_addr* address, unsigned int prefix, const struct loc_database_network_v1* dbobj) { | |
3dc8adfb | 798 | char country_code[3] = "\0\0"; |
a7a3d958 | 799 | |
39a55353 | 800 | int r = loc_network_new(ctx, network, address, prefix); |
94a3f329 MT |
801 | if (r) { |
802 | ERROR(ctx, "Could not allocate a new network: %s", strerror(-r)); | |
10778041 | 803 | return r; |
94a3f329 | 804 | } |
10778041 MT |
805 | |
806 | // Import country code | |
a7a3d958 | 807 | loc_country_code_copy(country_code, dbobj->country_code); |
10778041 MT |
808 | |
809 | r = loc_network_set_country_code(*network, country_code); | |
94a3f329 MT |
810 | if (r) { |
811 | ERROR(ctx, "Could not set country code: %s\n", country_code); | |
10778041 | 812 | return r; |
94a3f329 | 813 | } |
10778041 MT |
814 | |
815 | // Import ASN | |
94a3f329 MT |
816 | uint32_t asn = be32toh(dbobj->asn); |
817 | r = loc_network_set_asn(*network, asn); | |
818 | if (r) { | |
819 | ERROR(ctx, "Could not set ASN: %d\n", asn); | |
10778041 | 820 | return r; |
94a3f329 | 821 | } |
10778041 | 822 | |
a99e7c2b | 823 | // Import flags |
94a3f329 MT |
824 | int flags = be16toh(dbobj->flags); |
825 | r = loc_network_set_flag(*network, flags); | |
826 | if (r) { | |
827 | ERROR(ctx, "Could not set flags: %d\n", flags); | |
a99e7c2b | 828 | return r; |
94a3f329 | 829 | } |
a99e7c2b | 830 | |
10778041 MT |
831 | return 0; |
832 | } | |
833 | ||
3b5f4af2 MT |
834 | struct loc_network_tree { |
835 | struct loc_ctx* ctx; | |
836 | int refcount; | |
837 | ||
838 | struct loc_network_tree_node* root; | |
839 | }; | |
840 | ||
841 | struct loc_network_tree_node { | |
438db08c MT |
842 | struct loc_ctx* ctx; |
843 | int refcount; | |
844 | ||
3b5f4af2 MT |
845 | struct loc_network_tree_node* zero; |
846 | struct loc_network_tree_node* one; | |
847 | ||
848 | struct loc_network* network; | |
849 | }; | |
850 | ||
7933f5bf | 851 | int loc_network_tree_new(struct loc_ctx* ctx, struct loc_network_tree** tree) { |
3b5f4af2 MT |
852 | struct loc_network_tree* t = calloc(1, sizeof(*t)); |
853 | if (!t) | |
854 | return -ENOMEM; | |
855 | ||
856 | t->ctx = loc_ref(ctx); | |
857 | t->refcount = 1; | |
858 | ||
859 | // Create the root node | |
438db08c MT |
860 | int r = loc_network_tree_node_new(ctx, &t->root); |
861 | if (r) { | |
862 | loc_network_tree_unref(t); | |
863 | return r; | |
864 | } | |
3b5f4af2 MT |
865 | |
866 | DEBUG(t->ctx, "Network tree allocated at %p\n", t); | |
867 | *tree = t; | |
868 | return 0; | |
869 | } | |
870 | ||
7933f5bf | 871 | struct loc_network_tree_node* loc_network_tree_get_root(struct loc_network_tree* tree) { |
438db08c | 872 | return loc_network_tree_node_ref(tree->root); |
3b5f4af2 MT |
873 | } |
874 | ||
875 | static struct loc_network_tree_node* loc_network_tree_get_node(struct loc_network_tree_node* node, int path) { | |
876 | struct loc_network_tree_node** n; | |
877 | ||
2a30e4de | 878 | if (path == 0) |
3b5f4af2 | 879 | n = &node->zero; |
3eda9cab MT |
880 | else |
881 | n = &node->one; | |
3b5f4af2 MT |
882 | |
883 | // If the desired node doesn't exist, yet, we will create it | |
884 | if (*n == NULL) { | |
438db08c | 885 | int r = loc_network_tree_node_new(node->ctx, n); |
3b5f4af2 MT |
886 | if (r) |
887 | return NULL; | |
888 | } | |
889 | ||
890 | return *n; | |
891 | } | |
892 | ||
39a55353 | 893 | static struct loc_network_tree_node* loc_network_tree_get_path(struct loc_network_tree* tree, const struct in6_addr* address, unsigned int prefix) { |
3b5f4af2 MT |
894 | struct loc_network_tree_node* node = tree->root; |
895 | ||
39a55353 | 896 | for (unsigned int i = 0; i < prefix; i++) { |
3b5f4af2 | 897 | // Check if the ith bit is one or zero |
2a30e4de | 898 | node = loc_network_tree_get_node(node, in6_addr_get_bit(address, i)); |
3b5f4af2 MT |
899 | } |
900 | ||
901 | return node; | |
902 | } | |
903 | ||
904 | static int __loc_network_tree_walk(struct loc_ctx* ctx, struct loc_network_tree_node* node, | |
f3e02bc5 MT |
905 | int(*filter_callback)(struct loc_network* network, void* data), |
906 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
3b5f4af2 MT |
907 | int r; |
908 | ||
909 | // Finding a network ends the walk here | |
910 | if (node->network) { | |
911 | if (filter_callback) { | |
f3e02bc5 | 912 | int f = filter_callback(node->network, data); |
3b5f4af2 MT |
913 | if (f < 0) |
914 | return f; | |
915 | ||
916 | // Skip network if filter function returns value greater than zero | |
917 | if (f > 0) | |
918 | return 0; | |
919 | } | |
920 | ||
f3e02bc5 | 921 | r = callback(node->network, data); |
3b5f4af2 MT |
922 | if (r) |
923 | return r; | |
924 | } | |
925 | ||
926 | // Walk down on the left side of the tree first | |
927 | if (node->zero) { | |
f3e02bc5 | 928 | r = __loc_network_tree_walk(ctx, node->zero, filter_callback, callback, data); |
3b5f4af2 MT |
929 | if (r) |
930 | return r; | |
931 | } | |
932 | ||
933 | // Then walk on the other side | |
934 | if (node->one) { | |
f3e02bc5 | 935 | r = __loc_network_tree_walk(ctx, node->one, filter_callback, callback, data); |
3b5f4af2 MT |
936 | if (r) |
937 | return r; | |
938 | } | |
939 | ||
940 | return 0; | |
941 | } | |
942 | ||
7933f5bf | 943 | int loc_network_tree_walk(struct loc_network_tree* tree, |
f3e02bc5 MT |
944 | int(*filter_callback)(struct loc_network* network, void* data), |
945 | int(*callback)(struct loc_network* network, void* data), void* data) { | |
946 | return __loc_network_tree_walk(tree->ctx, tree->root, filter_callback, callback, data); | |
947 | } | |
948 | ||
3b5f4af2 MT |
949 | static void loc_network_tree_free(struct loc_network_tree* tree) { |
950 | DEBUG(tree->ctx, "Releasing network tree at %p\n", tree); | |
951 | ||
438db08c | 952 | loc_network_tree_node_unref(tree->root); |
3b5f4af2 MT |
953 | |
954 | loc_unref(tree->ctx); | |
955 | free(tree); | |
956 | } | |
957 | ||
7933f5bf | 958 | struct loc_network_tree* loc_network_tree_unref(struct loc_network_tree* tree) { |
3b5f4af2 MT |
959 | if (--tree->refcount > 0) |
960 | return tree; | |
961 | ||
962 | loc_network_tree_free(tree); | |
963 | return NULL; | |
964 | } | |
965 | ||
e9b4e2a8 | 966 | static int __loc_network_tree_dump(struct loc_network* network, void* data) { |
3b5f4af2 MT |
967 | DEBUG(network->ctx, "Dumping network at %p\n", network); |
968 | ||
969 | char* s = loc_network_str(network); | |
970 | if (!s) | |
971 | return 1; | |
972 | ||
973 | INFO(network->ctx, "%s\n", s); | |
974 | free(s); | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
7933f5bf | 979 | int loc_network_tree_dump(struct loc_network_tree* tree) { |
3b5f4af2 MT |
980 | DEBUG(tree->ctx, "Dumping network tree at %p\n", tree); |
981 | ||
f3e02bc5 | 982 | return loc_network_tree_walk(tree, NULL, __loc_network_tree_dump, NULL); |
3b5f4af2 MT |
983 | } |
984 | ||
7933f5bf | 985 | int loc_network_tree_add_network(struct loc_network_tree* tree, struct loc_network* network) { |
3b5f4af2 MT |
986 | DEBUG(tree->ctx, "Adding network %p to tree %p\n", network, tree); |
987 | ||
39a55353 | 988 | struct loc_network_tree_node* node = loc_network_tree_get_path(tree, |
ce4f5752 | 989 | &network->first_address, network->prefix); |
3b5f4af2 MT |
990 | if (!node) { |
991 | ERROR(tree->ctx, "Could not find a node\n"); | |
992 | return -ENOMEM; | |
993 | } | |
994 | ||
995 | // Check if node has not been set before | |
996 | if (node->network) { | |
997 | DEBUG(tree->ctx, "There is already a network at this path\n"); | |
c04005bb | 998 | return -EBUSY; |
3b5f4af2 MT |
999 | } |
1000 | ||
1001 | // Point node to the network | |
1002 | node->network = loc_network_ref(network); | |
1003 | ||
1004 | return 0; | |
1005 | } | |
f3e02bc5 MT |
1006 | |
1007 | static int __loc_network_tree_count(struct loc_network* network, void* data) { | |
1008 | size_t* counter = (size_t*)data; | |
1009 | ||
1010 | // Increase the counter for each network | |
1011 | counter++; | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | ||
7933f5bf | 1016 | size_t loc_network_tree_count_networks(struct loc_network_tree* tree) { |
f3e02bc5 MT |
1017 | size_t counter = 0; |
1018 | ||
1019 | int r = loc_network_tree_walk(tree, NULL, __loc_network_tree_count, &counter); | |
1020 | if (r) | |
1021 | return r; | |
1022 | ||
1023 | return counter; | |
1024 | } | |
940f9c2b MT |
1025 | |
1026 | static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node* node) { | |
1027 | size_t counter = 1; | |
1028 | ||
1029 | if (node->zero) | |
1030 | counter += __loc_network_tree_count_nodes(node->zero); | |
1031 | ||
1032 | if (node->one) | |
1033 | counter += __loc_network_tree_count_nodes(node->one); | |
1034 | ||
1035 | return counter; | |
1036 | } | |
1037 | ||
7933f5bf | 1038 | size_t loc_network_tree_count_nodes(struct loc_network_tree* tree) { |
940f9c2b MT |
1039 | return __loc_network_tree_count_nodes(tree->root); |
1040 | } | |
438db08c | 1041 | |
7933f5bf | 1042 | int loc_network_tree_node_new(struct loc_ctx* ctx, struct loc_network_tree_node** node) { |
438db08c MT |
1043 | struct loc_network_tree_node* n = calloc(1, sizeof(*n)); |
1044 | if (!n) | |
1045 | return -ENOMEM; | |
1046 | ||
1047 | n->ctx = loc_ref(ctx); | |
1048 | n->refcount = 1; | |
1049 | ||
1050 | n->zero = n->one = NULL; | |
1051 | ||
1052 | DEBUG(n->ctx, "Network node allocated at %p\n", n); | |
1053 | *node = n; | |
1054 | return 0; | |
1055 | } | |
1056 | ||
7933f5bf | 1057 | struct loc_network_tree_node* loc_network_tree_node_ref(struct loc_network_tree_node* node) { |
438db08c MT |
1058 | if (node) |
1059 | node->refcount++; | |
1060 | ||
1061 | return node; | |
1062 | } | |
1063 | ||
1064 | static void loc_network_tree_node_free(struct loc_network_tree_node* node) { | |
1065 | DEBUG(node->ctx, "Releasing network node at %p\n", node); | |
1066 | ||
1067 | if (node->network) | |
1068 | loc_network_unref(node->network); | |
1069 | ||
1070 | if (node->zero) | |
1071 | loc_network_tree_node_unref(node->zero); | |
1072 | ||
1073 | if (node->one) | |
1074 | loc_network_tree_node_unref(node->one); | |
1075 | ||
1076 | loc_unref(node->ctx); | |
1077 | free(node); | |
1078 | } | |
1079 | ||
7933f5bf | 1080 | struct loc_network_tree_node* loc_network_tree_node_unref(struct loc_network_tree_node* node) { |
438db08c MT |
1081 | if (!node) |
1082 | return NULL; | |
1083 | ||
1084 | if (--node->refcount > 0) | |
1085 | return node; | |
1086 | ||
1087 | loc_network_tree_node_free(node); | |
1088 | return NULL; | |
1089 | } | |
1090 | ||
7933f5bf | 1091 | struct loc_network_tree_node* loc_network_tree_node_get(struct loc_network_tree_node* node, unsigned int index) { |
438db08c MT |
1092 | if (index == 0) |
1093 | node = node->zero; | |
1094 | else | |
1095 | node = node->one; | |
1096 | ||
1097 | if (!node) | |
1098 | return NULL; | |
1099 | ||
1100 | return loc_network_tree_node_ref(node); | |
1101 | } | |
1102 | ||
7933f5bf | 1103 | int loc_network_tree_node_is_leaf(struct loc_network_tree_node* node) { |
438db08c MT |
1104 | return (!!node->network); |
1105 | } | |
1106 | ||
7933f5bf | 1107 | struct loc_network* loc_network_tree_node_get_network(struct loc_network_tree_node* node) { |
438db08c MT |
1108 | return loc_network_ref(node->network); |
1109 | } |