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                 return 1;
 599         }
 600
 601         // We cannot perform this operation if both networks equal
 602         if (loc_network_cmp(self, other) == 0) {
 603                 DEBUG(self->ctx, "Networks %p and %p are equal\n", self, other);
 604
 605                 return 1;
 606         }
 607
 608         return __loc_network_exclude(self, other, list);
 609 }
 610
 611 LOC_EXPORT struct loc_network_list* loc_network_exclude(
 612                 struct loc_network* self, struct loc_network* other) {
 613         struct loc_network_list* list;
 614
 615 #ifdef ENABLE_DEBUG
 616         char* n1 = loc_network_str(self);
 617         char* n2 = loc_network_str(other);
 618
 619         DEBUG(self->ctx, "Returning %s excluding %s...\n", n1, n2);
 620
 621         free(n1);
 622         free(n2);
 623 #endif
 624
 625         // Create a new list with the result
 626         int r = loc_network_list_new(self->ctx, &list);
 627         if (r) {
 628                 ERROR(self->ctx, "Could not create network list: %d\n", r);
 629
 630                 return NULL;
 631         }
 632
 633         r = __loc_network_exclude_to_list(self, other, list);
 634         if (r) {
 635                 loc_network_list_unref(list);
 636
 637                 return NULL;
 638         }
 639
 640         // Return the result
 641         return list;
 642 }
 643
 644 LOC_EXPORT struct loc_network_list* loc_network_exclude_list(
 645                 struct loc_network* network, struct loc_network_list* list) {
 646         struct loc_network_list* to_check;
 647
 648         // Create a new list with all networks to look at
 649         int r = loc_network_list_new(network->ctx, &to_check);
 650         if (r)
 651                 return NULL;
 652
 653         struct loc_network* subnet = NULL;
 654         struct loc_network_list* subnets = NULL;
 655
 656         for (unsigned int i = 0; i < loc_network_list_size(list); i++) {
 657                 subnet = loc_network_list_get(list, i);
 658
 659                 // Find all excluded networks
 660                 if (!loc_network_list_contains(to_check, subnet)) {
 661                         r = __loc_network_exclude_to_list(network, subnet, to_check);
 662                         if (r) {
 663                                 loc_network_list_unref(to_check);
 664                                 loc_network_unref(subnet);
 665
 666                                 return NULL;
 667                         }
 668                 }
 669
 670                 // Cleanup
 671                 loc_network_unref(subnet);
 672         }
 673
 674         r = loc_network_list_new(network->ctx, &subnets);
 675         if (r) {
 676                 loc_network_list_unref(to_check);
 677                 return NULL;
 678         }
 679
 680         while (!loc_network_list_empty(to_check)) {
 681                 struct loc_network* subnet_to_check = loc_network_list_pop(to_check);
 682
 683                 // Check whether the subnet to check is part of the input list
 684                 if (loc_network_list_contains(list, subnet_to_check)) {
 685                         loc_network_unref(subnet_to_check);
 686                         continue;
 687                 }
 688
 689                 // Marks whether this subnet passed all checks
 690                 int passed = 1;
 691
 692                 for (unsigned int i = 0; i < loc_network_list_size(list); i++) {
 693                         subnet = loc_network_list_get(list, i);
 694
 695                         // Drop this subnet if is a subnet of another subnet
 696                         if (loc_network_is_subnet(subnet_to_check, subnet)) {
 697                                 passed = 0;
 698                                 loc_network_unref(subnet);
 699                                 break;
 700                         }
 701
 702                         // Break it down if it overlaps
 703                         if (loc_network_overlaps(subnet_to_check, subnet)) {
 704                                 passed = 0;
 705
 706                                 struct loc_network_list* excluded = loc_network_exclude(subnet_to_check, subnet);
 707                                 if (excluded) {
 708                                         loc_network_list_merge(to_check, excluded);
 709                                         loc_network_list_unref(excluded);
 710                                 }
 711
 712                                 loc_network_unref(subnet);
 713                                 break;
 714                         }
 715
 716                         loc_network_unref(subnet);
 717                 }
 718
 719                 if (passed) {
 720                         r = loc_network_list_push(subnets, subnet_to_check);
 721                 }
 722
 723                 loc_network_unref(subnet_to_check);
 724         }
 725
 726         loc_network_list_unref(to_check);
 727
 728         // Sort the result
 729         loc_network_list_sort(subnets);
 730
 731         return subnets;
 732 }
 733
 734 LOC_EXPORT int loc_network_to_database_v1(struct loc_network* network, struct loc_database_network_v1* dbobj) {
 735         // Add country code
 736         loc_country_code_copy(dbobj->country_code, network->country_code);
 737
 738         // Add ASN
 739         dbobj->asn = htobe32(network->asn);
 740
 741         // Flags
 742         dbobj->flags = htobe16(network->flags);
 743
 744         return 0;
 745 }
 746
 747 LOC_EXPORT int loc_network_new_from_database_v1(struct loc_ctx* ctx, struct loc_network** network,
 748                 struct in6_addr* address, unsigned int prefix, const struct loc_database_network_v1* dbobj) {
 749         char country_code[3] = "\0\0";
 750
 751         int r = loc_network_new(ctx, network, address, prefix);
 752         if (r) {
 753                 ERROR(ctx, "Could not allocate a new network: %s", strerror(-r));
 754                 return r;
 755         }
 756
 757         // Import country code
 758         loc_country_code_copy(country_code, dbobj->country_code);
 759
 760         r = loc_network_set_country_code(*network, country_code);
 761         if (r) {
 762                 ERROR(ctx, "Could not set country code: %s\n", country_code);
 763                 return r;
 764         }
 765
 766         // Import ASN
 767         uint32_t asn = be32toh(dbobj->asn);
 768         r = loc_network_set_asn(*network, asn);
 769         if (r) {
 770                 ERROR(ctx, "Could not set ASN: %d\n", asn);
 771                 return r;
 772         }
 773
 774         // Import flags
 775         int flags = be16toh(dbobj->flags);
 776         r = loc_network_set_flag(*network, flags);
 777         if (r) {
 778                 ERROR(ctx, "Could not set flags: %d\n", flags);
 779                 return r;
 780         }
 781
 782         return 0;
 783 }
 784
 785 struct loc_network_tree {
 786         struct loc_ctx* ctx;
 787         int refcount;
 788
 789         struct loc_network_tree_node* root;
 790 };
 791
 792 struct loc_network_tree_node {
 793         struct loc_ctx* ctx;
 794         int refcount;
 795
 796         struct loc_network_tree_node* zero;
 797         struct loc_network_tree_node* one;
 798
 799         struct loc_network* network;
 800 };
 801
 802 int loc_network_tree_new(struct loc_ctx* ctx, struct loc_network_tree** tree) {
 803         struct loc_network_tree* t = calloc(1, sizeof(*t));
 804         if (!t)
 805                 return -ENOMEM;
 806
 807         t->ctx = loc_ref(ctx);
 808         t->refcount = 1;
 809
 810         // Create the root node
 811         int r = loc_network_tree_node_new(ctx, &t->root);
 812         if (r) {
 813                 loc_network_tree_unref(t);
 814                 return r;
 815         }
 816
 817         DEBUG(t->ctx, "Network tree allocated at %p\n", t);
 818         *tree = t;
 819         return 0;
 820 }
 821
 822 struct loc_network_tree_node* loc_network_tree_get_root(struct loc_network_tree* tree) {
 823         return loc_network_tree_node_ref(tree->root);
 824 }
 825
 826 static struct loc_network_tree_node* loc_network_tree_get_node(struct loc_network_tree_node* node, int path) {
 827         struct loc_network_tree_node** n;
 828
 829         if (path == 0)
 830                 n = &node->zero;
 831         else
 832                 n = &node->one;
 833
 834         // If the desired node doesn't exist, yet, we will create it
 835         if (*n == NULL) {
 836                 int r = loc_network_tree_node_new(node->ctx, n);
 837                 if (r)
 838                         return NULL;
 839         }
 840
 841         return *n;
 842 }
 843
 844 static struct loc_network_tree_node* loc_network_tree_get_path(struct loc_network_tree* tree, const struct in6_addr* address, unsigned int prefix) {
 845         struct loc_network_tree_node* node = tree->root;
 846
 847         for (unsigned int i = 0; i < prefix; i++) {
 848                 // Check if the ith bit is one or zero
 849                 node = loc_network_tree_get_node(node, in6_addr_get_bit(address, i));
 850         }
 851
 852         return node;
 853 }
 854
 855 static int __loc_network_tree_walk(struct loc_ctx* ctx, struct loc_network_tree_node* node,
 856                 int(*filter_callback)(struct loc_network* network, void* data),
 857                 int(*callback)(struct loc_network* network, void* data), void* data) {
 858         int r;
 859
 860         // Finding a network ends the walk here
 861         if (node->network) {
 862                 if (filter_callback) {
 863                         int f = filter_callback(node->network, data);
 864                         if (f < 0)
 865                                 return f;
 866
 867                         // Skip network if filter function returns value greater than zero
 868                         if (f > 0)
 869                                 return 0;
 870                 }
 871
 872                 r = callback(node->network, data);
 873                 if (r)
 874                         return r;
 875         }
 876
 877         // Walk down on the left side of the tree first
 878         if (node->zero) {
 879                 r = __loc_network_tree_walk(ctx, node->zero, filter_callback, callback, data);
 880                 if (r)
 881                         return r;
 882         }
 883
 884         // Then walk on the other side
 885         if (node->one) {
 886                 r = __loc_network_tree_walk(ctx, node->one, filter_callback, callback, data);
 887                 if (r)
 888                         return r;
 889         }
 890
 891         return 0;
 892 }
 893
 894 int loc_network_tree_walk(struct loc_network_tree* tree,
 895                 int(*filter_callback)(struct loc_network* network, void* data),
 896                 int(*callback)(struct loc_network* network, void* data), void* data) {
 897         return __loc_network_tree_walk(tree->ctx, tree->root, filter_callback, callback, data);
 898 }
 899
 900 static void loc_network_tree_free(struct loc_network_tree* tree) {
 901         DEBUG(tree->ctx, "Releasing network tree at %p\n", tree);
 902
 903         loc_network_tree_node_unref(tree->root);
 904
 905         loc_unref(tree->ctx);
 906         free(tree);
 907 }
 908
 909 struct loc_network_tree* loc_network_tree_unref(struct loc_network_tree* tree) {
 910         if (--tree->refcount > 0)
 911                 return tree;
 912
 913         loc_network_tree_free(tree);
 914         return NULL;
 915 }
 916
 917 static int __loc_network_tree_dump(struct loc_network* network, void* data) {
 918         DEBUG(network->ctx, "Dumping network at %p\n", network);
 919
 920         char* s = loc_network_str(network);
 921         if (!s)
 922                 return 1;
 923
 924         INFO(network->ctx, "%s\n", s);
 925         free(s);
 926
 927         return 0;
 928 }
 929
 930 int loc_network_tree_dump(struct loc_network_tree* tree) {
 931         DEBUG(tree->ctx, "Dumping network tree at %p\n", tree);
 932
 933         return loc_network_tree_walk(tree, NULL, __loc_network_tree_dump, NULL);
 934 }
 935
 936 int loc_network_tree_add_network(struct loc_network_tree* tree, struct loc_network* network) {
 937         DEBUG(tree->ctx, "Adding network %p to tree %p\n", network, tree);
 938
 939         struct loc_network_tree_node* node = loc_network_tree_get_path(tree,
 940                         &network->first_address, network->prefix);
 941         if (!node) {
 942                 ERROR(tree->ctx, "Could not find a node\n");
 943                 return -ENOMEM;
 944         }
 945
 946         // Check if node has not been set before
 947         if (node->network) {
 948                 DEBUG(tree->ctx, "There is already a network at this path\n");
 949                 return -EBUSY;
 950         }
 951
 952         // Point node to the network
 953         node->network = loc_network_ref(network);
 954
 955         return 0;
 956 }
 957
 958 static int __loc_network_tree_count(struct loc_network* network, void* data) {
 959         size_t* counter = (size_t*)data;
 960
 961         // Increase the counter for each network
 962         counter++;
 963
 964         return 0;
 965 }
 966
 967 size_t loc_network_tree_count_networks(struct loc_network_tree* tree) {
 968         size_t counter = 0;
 969
 970         int r = loc_network_tree_walk(tree, NULL, __loc_network_tree_count, &counter);
 971         if (r)
 972                 return r;
 973
 974         return counter;
 975 }
 976
 977 static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node* node) {
 978         size_t counter = 1;
 979
 980         if (node->zero)
 981                 counter += __loc_network_tree_count_nodes(node->zero);
 982
 983         if (node->one)
 984                 counter += __loc_network_tree_count_nodes(node->one);
 985
 986         return counter;
 987 }
 988
 989 size_t loc_network_tree_count_nodes(struct loc_network_tree* tree) {
 990         return __loc_network_tree_count_nodes(tree->root);
 991 }
 992
 993 int loc_network_tree_node_new(struct loc_ctx* ctx, struct loc_network_tree_node** node) {
 994         struct loc_network_tree_node* n = calloc(1, sizeof(*n));
 995         if (!n)
 996                 return -ENOMEM;
 997
 998         n->ctx = loc_ref(ctx);
 999         n->refcount = 1;
1000
1001         n->zero = n->one = NULL;
1002
1003         DEBUG(n->ctx, "Network node allocated at %p\n", n);
1004         *node = n;
1005         return 0;
1006 }
1007
1008 struct loc_network_tree_node* loc_network_tree_node_ref(struct loc_network_tree_node* node) {
1009         if (node)
1010                 node->refcount++;
1011
1012         return node;
1013 }
1014
1015 static void loc_network_tree_node_free(struct loc_network_tree_node* node) {
1016         DEBUG(node->ctx, "Releasing network node at %p\n", node);
1017
1018         if (node->network)
1019                 loc_network_unref(node->network);
1020
1021         if (node->zero)
1022                 loc_network_tree_node_unref(node->zero);
1023
1024         if (node->one)
1025                 loc_network_tree_node_unref(node->one);
1026
1027         loc_unref(node->ctx);
1028         free(node);
1029 }
1030
1031 struct loc_network_tree_node* loc_network_tree_node_unref(struct loc_network_tree_node* node) {
1032         if (!node)
1033                 return NULL;
1034
1035         if (--node->refcount > 0)
1036                 return node;
1037
1038         loc_network_tree_node_free(node);
1039         return NULL;
1040 }
1041
1042 struct loc_network_tree_node* loc_network_tree_node_get(struct loc_network_tree_node* node, unsigned int index) {
1043         if (index == 0)
1044                 node = node->zero;
1045         else
1046                 node = node->one;
1047
1048         if (!node)
1049                 return NULL;
1050
1051         return loc_network_tree_node_ref(node);
1052 }
1053
1054 int loc_network_tree_node_is_leaf(struct loc_network_tree_node* node) {
1055         return (!!node->network);
1056 }
1057
1058 struct loc_network* loc_network_tree_node_get_network(struct loc_network_tree_node* node) {
1059         return loc_network_ref(node->network);
1060 }