src/network.c

   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, subnet_to_check)) {
 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, subnet_to_check)) {
 706                                 passed = 0;
 707
 708                                 __loc_network_exclude_to_list(subnet_to_check, subnet, to_check);
 709
 710                                 loc_network_unref(subnet);
 711                                 break;
 712                         }
 713
 714                         loc_network_unref(subnet);
 715                 }
 716
 717                 if (passed) {
 718                         r = loc_network_list_push(subnets, subnet_to_check);
 719                 }
 720
 721                 loc_network_unref(subnet_to_check);
 722         }
 723
 724         loc_network_list_unref(to_check);
 725
 726         // Sort the result
 727         loc_network_list_sort(subnets);
 728
 729         return subnets;
 730 }
 731
 732 LOC_EXPORT int loc_network_to_database_v1(struct loc_network* network, struct loc_database_network_v1* dbobj) {
 733         // Add country code
 734         loc_country_code_copy(dbobj->country_code, network->country_code);
 735
 736         // Add ASN
 737         dbobj->asn = htobe32(network->asn);
 738
 739         // Flags
 740         dbobj->flags = htobe16(network->flags);
 741
 742         return 0;
 743 }
 744
 745 LOC_EXPORT int loc_network_new_from_database_v1(struct loc_ctx* ctx, struct loc_network** network,
 746                 struct in6_addr* address, unsigned int prefix, const struct loc_database_network_v1* dbobj) {
 747         char country_code[3] = "\0\0";
 748
 749         int r = loc_network_new(ctx, network, address, prefix);
 750         if (r) {
 751                 ERROR(ctx, "Could not allocate a new network: %s", strerror(-r));
 752                 return r;
 753         }
 754
 755         // Import country code
 756         loc_country_code_copy(country_code, dbobj->country_code);
 757
 758         r = loc_network_set_country_code(*network, country_code);
 759         if (r) {
 760                 ERROR(ctx, "Could not set country code: %s\n", country_code);
 761                 return r;
 762         }
 763
 764         // Import ASN
 765         uint32_t asn = be32toh(dbobj->asn);
 766         r = loc_network_set_asn(*network, asn);
 767         if (r) {
 768                 ERROR(ctx, "Could not set ASN: %d\n", asn);
 769                 return r;
 770         }
 771
 772         // Import flags
 773         int flags = be16toh(dbobj->flags);
 774         r = loc_network_set_flag(*network, flags);
 775         if (r) {
 776                 ERROR(ctx, "Could not set flags: %d\n", flags);
 777                 return r;
 778         }
 779
 780         return 0;
 781 }
 782
 783 struct loc_network_tree {
 784         struct loc_ctx* ctx;
 785         int refcount;
 786
 787         struct loc_network_tree_node* root;
 788 };
 789
 790 struct loc_network_tree_node {
 791         struct loc_ctx* ctx;
 792         int refcount;
 793
 794         struct loc_network_tree_node* zero;
 795         struct loc_network_tree_node* one;
 796
 797         struct loc_network* network;
 798 };
 799
 800 int loc_network_tree_new(struct loc_ctx* ctx, struct loc_network_tree** tree) {
 801         struct loc_network_tree* t = calloc(1, sizeof(*t));
 802         if (!t)
 803                 return -ENOMEM;
 804
 805         t->ctx = loc_ref(ctx);
 806         t->refcount = 1;
 807
 808         // Create the root node
 809         int r = loc_network_tree_node_new(ctx, &t->root);
 810         if (r) {
 811                 loc_network_tree_unref(t);
 812                 return r;
 813         }
 814
 815         DEBUG(t->ctx, "Network tree allocated at %p\n", t);
 816         *tree = t;
 817         return 0;
 818 }
 819
 820 struct loc_network_tree_node* loc_network_tree_get_root(struct loc_network_tree* tree) {
 821         return loc_network_tree_node_ref(tree->root);
 822 }
 823
 824 static struct loc_network_tree_node* loc_network_tree_get_node(struct loc_network_tree_node* node, int path) {
 825         struct loc_network_tree_node** n;
 826
 827         if (path == 0)
 828                 n = &node->zero;
 829         else
 830                 n = &node->one;
 831
 832         // If the desired node doesn't exist, yet, we will create it
 833         if (*n == NULL) {
 834                 int r = loc_network_tree_node_new(node->ctx, n);
 835                 if (r)
 836                         return NULL;
 837         }
 838
 839         return *n;
 840 }
 841
 842 static struct loc_network_tree_node* loc_network_tree_get_path(struct loc_network_tree* tree, const struct in6_addr* address, unsigned int prefix) {
 843         struct loc_network_tree_node* node = tree->root;
 844
 845         for (unsigned int i = 0; i < prefix; i++) {
 846                 // Check if the ith bit is one or zero
 847                 node = loc_network_tree_get_node(node, in6_addr_get_bit(address, i));
 848         }
 849
 850         return node;
 851 }
 852
 853 static int __loc_network_tree_walk(struct loc_ctx* ctx, struct loc_network_tree_node* node,
 854                 int(*filter_callback)(struct loc_network* network, void* data),
 855                 int(*callback)(struct loc_network* network, void* data), void* data) {
 856         int r;
 857
 858         // Finding a network ends the walk here
 859         if (node->network) {
 860                 if (filter_callback) {
 861                         int f = filter_callback(node->network, data);
 862                         if (f < 0)
 863                                 return f;
 864
 865                         // Skip network if filter function returns value greater than zero
 866                         if (f > 0)
 867                                 return 0;
 868                 }
 869
 870                 r = callback(node->network, data);
 871                 if (r)
 872                         return r;
 873         }
 874
 875         // Walk down on the left side of the tree first
 876         if (node->zero) {
 877                 r = __loc_network_tree_walk(ctx, node->zero, filter_callback, callback, data);
 878                 if (r)
 879                         return r;
 880         }
 881
 882         // Then walk on the other side
 883         if (node->one) {
 884                 r = __loc_network_tree_walk(ctx, node->one, filter_callback, callback, data);
 885                 if (r)
 886                         return r;
 887         }
 888
 889         return 0;
 890 }
 891
 892 int loc_network_tree_walk(struct loc_network_tree* tree,
 893                 int(*filter_callback)(struct loc_network* network, void* data),
 894                 int(*callback)(struct loc_network* network, void* data), void* data) {
 895         return __loc_network_tree_walk(tree->ctx, tree->root, filter_callback, callback, data);
 896 }
 897
 898 static void loc_network_tree_free(struct loc_network_tree* tree) {
 899         DEBUG(tree->ctx, "Releasing network tree at %p\n", tree);
 900
 901         loc_network_tree_node_unref(tree->root);
 902
 903         loc_unref(tree->ctx);
 904         free(tree);
 905 }
 906
 907 struct loc_network_tree* loc_network_tree_unref(struct loc_network_tree* tree) {
 908         if (--tree->refcount > 0)
 909                 return tree;
 910
 911         loc_network_tree_free(tree);
 912         return NULL;
 913 }
 914
 915 static int __loc_network_tree_dump(struct loc_network* network, void* data) {
 916         DEBUG(network->ctx, "Dumping network at %p\n", network);
 917
 918         char* s = loc_network_str(network);
 919         if (!s)
 920                 return 1;
 921
 922         INFO(network->ctx, "%s\n", s);
 923         free(s);
 924
 925         return 0;
 926 }
 927
 928 int loc_network_tree_dump(struct loc_network_tree* tree) {
 929         DEBUG(tree->ctx, "Dumping network tree at %p\n", tree);
 930
 931         return loc_network_tree_walk(tree, NULL, __loc_network_tree_dump, NULL);
 932 }
 933
 934 int loc_network_tree_add_network(struct loc_network_tree* tree, struct loc_network* network) {
 935         DEBUG(tree->ctx, "Adding network %p to tree %p\n", network, tree);
 936
 937         struct loc_network_tree_node* node = loc_network_tree_get_path(tree,
 938                         &network->first_address, network->prefix);
 939         if (!node) {
 940                 ERROR(tree->ctx, "Could not find a node\n");
 941                 return -ENOMEM;
 942         }
 943
 944         // Check if node has not been set before
 945         if (node->network) {
 946                 DEBUG(tree->ctx, "There is already a network at this path\n");
 947                 return -EBUSY;
 948         }
 949
 950         // Point node to the network
 951         node->network = loc_network_ref(network);
 952
 953         return 0;
 954 }
 955
 956 static int __loc_network_tree_count(struct loc_network* network, void* data) {
 957         size_t* counter = (size_t*)data;
 958
 959         // Increase the counter for each network
 960         counter++;
 961
 962         return 0;
 963 }
 964
 965 size_t loc_network_tree_count_networks(struct loc_network_tree* tree) {
 966         size_t counter = 0;
 967
 968         int r = loc_network_tree_walk(tree, NULL, __loc_network_tree_count, &counter);
 969         if (r)
 970                 return r;
 971
 972         return counter;
 973 }
 974
 975 static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node* node) {
 976         size_t counter = 1;
 977
 978         if (node->zero)
 979                 counter += __loc_network_tree_count_nodes(node->zero);
 980
 981         if (node->one)
 982                 counter += __loc_network_tree_count_nodes(node->one);
 983
 984         return counter;
 985 }
 986
 987 size_t loc_network_tree_count_nodes(struct loc_network_tree* tree) {
 988         return __loc_network_tree_count_nodes(tree->root);
 989 }
 990
 991 int loc_network_tree_node_new(struct loc_ctx* ctx, struct loc_network_tree_node** node) {
 992         struct loc_network_tree_node* n = calloc(1, sizeof(*n));
 993         if (!n)
 994                 return -ENOMEM;
 995
 996         n->ctx = loc_ref(ctx);
 997         n->refcount = 1;
 998
 999         n->zero = n->one = NULL;
1000
1001         DEBUG(n->ctx, "Network node allocated at %p\n", n);
1002         *node = n;
1003         return 0;
1004 }
1005
1006 struct loc_network_tree_node* loc_network_tree_node_ref(struct loc_network_tree_node* node) {
1007         if (node)
1008                 node->refcount++;
1009
1010         return node;
1011 }
1012
1013 static void loc_network_tree_node_free(struct loc_network_tree_node* node) {
1014         DEBUG(node->ctx, "Releasing network node at %p\n", node);
1015
1016         if (node->network)
1017                 loc_network_unref(node->network);
1018
1019         if (node->zero)
1020                 loc_network_tree_node_unref(node->zero);
1021
1022         if (node->one)
1023                 loc_network_tree_node_unref(node->one);
1024
1025         loc_unref(node->ctx);
1026         free(node);
1027 }
1028
1029 struct loc_network_tree_node* loc_network_tree_node_unref(struct loc_network_tree_node* node) {
1030         if (!node)
1031                 return NULL;
1032
1033         if (--node->refcount > 0)
1034                 return node;
1035
1036         loc_network_tree_node_free(node);
1037         return NULL;
1038 }
1039
1040 struct loc_network_tree_node* loc_network_tree_node_get(struct loc_network_tree_node* node, unsigned int index) {
1041         if (index == 0)
1042                 node = node->zero;
1043         else
1044                 node = node->one;
1045
1046         if (!node)
1047                 return NULL;
1048
1049         return loc_network_tree_node_ref(node);
1050 }
1051
1052 int loc_network_tree_node_is_leaf(struct loc_network_tree_node* node) {
1053         return (!!node->network);
1054 }
1055
1056 struct loc_network* loc_network_tree_node_get_network(struct loc_network_tree_node* node) {
1057         return loc_network_ref(node->network);
1058 }