2 libloc - A library to determine the location of someone on the Internet
4 Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
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.
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.
17 #include <arpa/inet.h>
20 #include <netinet/in.h>
27 #include <sys/types.h>
35 #include <openssl/err.h>
36 #include <openssl/evp.h>
37 #include <openssl/pem.h>
39 #include <loc/libloc.h>
41 #include <loc/compat.h>
42 #include <loc/country.h>
43 #include <loc/database.h>
44 #include <loc/format.h>
45 #include <loc/network.h>
46 #include <loc/private.h>
47 #include <loc/stringpool.h>
55 enum loc_database_version version
;
62 size_t signature_length
;
64 // ASes in the database
65 struct loc_database_as_v1
* as_v1
;
69 struct loc_database_network_node_v1
* network_nodes_v1
;
70 size_t network_nodes_count
;
73 struct loc_database_network_v1
* networks_v1
;
74 size_t networks_count
;
77 struct loc_database_country_v1
* countries_v1
;
78 size_t countries_count
;
80 struct loc_stringpool
* pool
;
83 #define MAX_STACK_DEPTH 256
85 struct loc_node_stack
{
87 int i
; // Is this node 0 or 1?
91 struct loc_database_enumerator
{
93 struct loc_database
* db
;
94 enum loc_database_enumerator_mode mode
;
101 enum loc_network_flags flags
;
104 // Index of the AS we are looking at
105 unsigned int as_index
;
108 struct in6_addr network_address
;
109 struct loc_node_stack network_stack
[MAX_STACK_DEPTH
];
110 int network_stack_depth
;
111 unsigned int* networks_visited
;
114 static int loc_database_read_magic(struct loc_database
* db
) {
115 struct loc_database_magic magic
;
118 size_t bytes_read
= fread(&magic
, 1, sizeof(magic
), db
->f
);
120 // Check if we have been able to read enough data
121 if (bytes_read
< sizeof(magic
)) {
122 ERROR(db
->ctx
, "Could not read enough data to validate magic bytes\n");
123 DEBUG(db
->ctx
, "Read %zu bytes, but needed %zu\n", bytes_read
, sizeof(magic
));
127 // Compare magic bytes
128 if (memcmp(LOC_DATABASE_MAGIC
, magic
.magic
, strlen(LOC_DATABASE_MAGIC
)) == 0) {
129 DEBUG(db
->ctx
, "Magic value matches\n");
132 db
->version
= magic
.version
;
137 ERROR(db
->ctx
, "Unrecognized file type\n");
143 static int loc_database_read_as_section_v1(struct loc_database
* db
,
144 const struct loc_database_header_v1
* header
) {
145 off_t as_offset
= be32toh(header
->as_offset
);
146 size_t as_length
= be32toh(header
->as_length
);
148 DEBUG(db
->ctx
, "Reading AS section from %jd (%zu bytes)\n", (intmax_t)as_offset
, as_length
);
151 db
->as_v1
= mmap(NULL
, as_length
, PROT_READ
,
152 MAP_SHARED
, fileno(db
->f
), as_offset
);
154 if (db
->as_v1
== MAP_FAILED
)
158 db
->as_count
= as_length
/ sizeof(*db
->as_v1
);
160 INFO(db
->ctx
, "Read %zu ASes from the database\n", db
->as_count
);
165 static int loc_database_read_network_nodes_section_v1(struct loc_database
* db
,
166 const struct loc_database_header_v1
* header
) {
167 off_t network_nodes_offset
= be32toh(header
->network_tree_offset
);
168 size_t network_nodes_length
= be32toh(header
->network_tree_length
);
170 DEBUG(db
->ctx
, "Reading network nodes section from %jd (%zu bytes)\n",
171 (intmax_t)network_nodes_offset
, network_nodes_length
);
173 if (network_nodes_length
> 0) {
174 db
->network_nodes_v1
= mmap(NULL
, network_nodes_length
, PROT_READ
,
175 MAP_SHARED
, fileno(db
->f
), network_nodes_offset
);
177 if (db
->network_nodes_v1
== MAP_FAILED
)
181 db
->network_nodes_count
= network_nodes_length
/ sizeof(*db
->network_nodes_v1
);
183 INFO(db
->ctx
, "Read %zu network nodes from the database\n", db
->network_nodes_count
);
188 static int loc_database_read_networks_section_v1(struct loc_database
* db
,
189 const struct loc_database_header_v1
* header
) {
190 off_t networks_offset
= be32toh(header
->network_data_offset
);
191 size_t networks_length
= be32toh(header
->network_data_length
);
193 DEBUG(db
->ctx
, "Reading networks section from %jd (%zu bytes)\n",
194 (intmax_t)networks_offset
, networks_length
);
196 if (networks_length
> 0) {
197 db
->networks_v1
= mmap(NULL
, networks_length
, PROT_READ
,
198 MAP_SHARED
, fileno(db
->f
), networks_offset
);
200 if (db
->networks_v1
== MAP_FAILED
)
204 db
->networks_count
= networks_length
/ sizeof(*db
->networks_v1
);
206 INFO(db
->ctx
, "Read %zu networks from the database\n", db
->networks_count
);
211 static int loc_database_read_countries_section_v1(struct loc_database
* db
,
212 const struct loc_database_header_v1
* header
) {
213 off_t countries_offset
= be32toh(header
->countries_offset
);
214 size_t countries_length
= be32toh(header
->countries_length
);
216 DEBUG(db
->ctx
, "Reading countries section from %jd (%zu bytes)\n",
217 (intmax_t)countries_offset
, countries_length
);
219 if (countries_length
> 0) {
220 db
->countries_v1
= mmap(NULL
, countries_length
, PROT_READ
,
221 MAP_SHARED
, fileno(db
->f
), countries_offset
);
223 if (db
->countries_v1
== MAP_FAILED
)
227 db
->countries_count
= countries_length
/ sizeof(*db
->countries_v1
);
229 INFO(db
->ctx
, "Read %zu countries from the database\n",
230 db
->countries_count
);
235 static int loc_database_read_header_v1(struct loc_database
* db
) {
236 struct loc_database_header_v1 header
;
239 size_t size
= fread(&header
, 1, sizeof(header
), db
->f
);
241 if (size
< sizeof(header
)) {
242 ERROR(db
->ctx
, "Could not read enough data for header\n");
247 db
->created_at
= be64toh(header
.created_at
);
248 db
->vendor
= be32toh(header
.vendor
);
249 db
->description
= be32toh(header
.description
);
250 db
->license
= be32toh(header
.license
);
253 db
->signature_length
= be32toh(header
.signature_length
);
254 if (db
->signature_length
) {
255 // Check for a plausible signature length
256 if (db
->signature_length
> LOC_SIGNATURE_MAX_LENGTH
) {
257 ERROR(db
->ctx
, "Signature too long: %ld\n", db
->signature_length
);
261 DEBUG(db
->ctx
, "Reading signature of %ld bytes\n",
262 db
->signature_length
);
264 db
->signature
= malloc(db
->signature_length
);
265 for (unsigned int i
= 0; i
< db
->signature_length
; i
++)
266 db
->signature
[i
] = header
.signature
[i
];
270 off_t pool_offset
= be32toh(header
.pool_offset
);
271 size_t pool_length
= be32toh(header
.pool_length
);
273 int r
= loc_stringpool_open(db
->ctx
, &db
->pool
,
274 db
->f
, pool_length
, pool_offset
);
279 r
= loc_database_read_as_section_v1(db
, &header
);
284 r
= loc_database_read_network_nodes_section_v1(db
, &header
);
289 r
= loc_database_read_networks_section_v1(db
, &header
);
294 r
= loc_database_read_countries_section_v1(db
, &header
);
301 static int loc_database_read_header(struct loc_database
* db
) {
302 DEBUG(db
->ctx
, "Database version is %u\n", db
->version
);
304 switch (db
->version
) {
305 case LOC_DATABASE_VERSION_1
:
306 return loc_database_read_header_v1(db
);
309 ERROR(db
->ctx
, "Incompatible database version: %u\n", db
->version
);
314 static int loc_database_read(struct loc_database
* db
, FILE* f
) {
315 clock_t start
= clock();
319 // Clone file descriptor
322 ERROR(db
->ctx
, "Could not duplicate file descriptor\n");
326 // Reopen the file so that we can keep our own file handle
327 db
->f
= fdopen(fd
, "r");
329 ERROR(db
->ctx
, "Could not re-open database file\n");
333 // Rewind to the start of the file
337 int r
= loc_database_read_magic(db
);
342 r
= loc_database_read_header(db
);
346 clock_t end
= clock();
348 INFO(db
->ctx
, "Opened database in %.4fms\n",
349 (double)(end
- start
) / CLOCKS_PER_SEC
* 1000);
354 LOC_EXPORT
int loc_database_new(struct loc_ctx
* ctx
, struct loc_database
** database
, FILE* f
) {
355 // Fail on invalid file handle
359 struct loc_database
* db
= calloc(1, sizeof(*db
));
364 db
->ctx
= loc_ref(ctx
);
367 DEBUG(db
->ctx
, "Database object allocated at %p\n", db
);
369 int r
= loc_database_read(db
, f
);
371 loc_database_unref(db
);
380 LOC_EXPORT
struct loc_database
* loc_database_ref(struct loc_database
* db
) {
386 static void loc_database_free(struct loc_database
* db
) {
389 DEBUG(db
->ctx
, "Releasing database %p\n", db
);
393 r
= munmap(db
->as_v1
, db
->as_count
* sizeof(*db
->as_v1
));
395 ERROR(db
->ctx
, "Could not unmap AS section: %s\n", strerror(errno
));
398 // Remove mapped network sections
399 if (db
->networks_v1
) {
400 r
= munmap(db
->networks_v1
, db
->networks_count
* sizeof(*db
->networks_v1
));
402 ERROR(db
->ctx
, "Could not unmap networks section: %s\n", strerror(errno
));
405 // Remove mapped network nodes section
406 if (db
->network_nodes_v1
) {
407 r
= munmap(db
->network_nodes_v1
, db
->network_nodes_count
* sizeof(*db
->network_nodes_v1
));
409 ERROR(db
->ctx
, "Could not unmap network nodes section: %s\n", strerror(errno
));
413 loc_stringpool_unref(db
->pool
);
419 // Close database file
427 LOC_EXPORT
struct loc_database
* loc_database_unref(struct loc_database
* db
) {
428 if (--db
->refcount
> 0)
431 loc_database_free(db
);
435 LOC_EXPORT
int loc_database_verify(struct loc_database
* db
, FILE* f
) {
436 // Cannot do this when no signature is available
437 if (!db
->signature
) {
438 DEBUG(db
->ctx
, "No signature available to verify\n");
442 // Start the stopwatch
443 clock_t start
= clock();
446 EVP_PKEY
* pkey
= PEM_read_PUBKEY(f
, NULL
, NULL
, NULL
);
448 char* error
= ERR_error_string(ERR_get_error(), NULL
);
449 ERROR(db
->ctx
, "Could not parse public key: %s\n", error
);
456 EVP_MD_CTX
* mdctx
= EVP_MD_CTX_new();
458 // Initialise hash function
459 r
= EVP_DigestVerifyInit(mdctx
, NULL
, NULL
, NULL
, pkey
);
461 ERROR(db
->ctx
, "Error initializing signature validation: %s\n",
462 ERR_error_string(ERR_get_error(), NULL
));
468 // Reset file to start
472 struct loc_database_magic magic
;
473 fread(&magic
, 1, sizeof(magic
), db
->f
);
475 hexdump(db
->ctx
, &magic
, sizeof(magic
));
477 // Feed magic into the hash
478 r
= EVP_DigestVerifyUpdate(mdctx
, &magic
, sizeof(magic
));
480 ERROR(db
->ctx
, "%s\n", ERR_error_string(ERR_get_error(), NULL
));
487 struct loc_database_header_v1 header_v1
;
490 switch (db
->version
) {
491 case LOC_DATABASE_VERSION_1
:
492 bytes_read
= fread(&header_v1
, 1, sizeof(header_v1
), db
->f
);
493 if (bytes_read
< sizeof(header_v1
)) {
494 ERROR(db
->ctx
, "Could not read header\n");
501 for (unsigned int i
= 0; i
< sizeof(header_v1
.signature
); i
++) {
502 header_v1
.signature
[i
] = '\0';
505 hexdump(db
->ctx
, &header_v1
, sizeof(header_v1
));
507 // Feed header into the hash
508 r
= EVP_DigestVerifyUpdate(mdctx
, &header_v1
, sizeof(header_v1
));
510 ERROR(db
->ctx
, "%s\n", ERR_error_string(ERR_get_error(), NULL
));
518 ERROR(db
->ctx
, "Cannot compute hash for database with format %d\n",
524 // Walk through the file in chunks of 64kB
525 char buffer
[64 * 1024];
527 while (!feof(db
->f
)) {
528 bytes_read
= fread(buffer
, 1, sizeof(buffer
), db
->f
);
530 hexdump(db
->ctx
, buffer
, bytes_read
);
532 r
= EVP_DigestVerifyUpdate(mdctx
, buffer
, bytes_read
);
534 ERROR(db
->ctx
, "%s\n", ERR_error_string(ERR_get_error(), NULL
));
542 r
= EVP_DigestVerifyFinal(mdctx
,
543 (unsigned char*)db
->signature
, db
->signature_length
);
546 DEBUG(db
->ctx
, "The signature is invalid\n");
549 DEBUG(db
->ctx
, "The signature is valid\n");
552 ERROR(db
->ctx
, "Error verifying the signature: %s\n",
553 ERR_error_string(ERR_get_error(), NULL
));
558 hexdump(db
->ctx
, db
->signature
, db
->signature_length
);
560 clock_t end
= clock();
561 DEBUG(db
->ctx
, "Signature checked in %.4fms\n",
562 (double)(end
- start
) / CLOCKS_PER_SEC
* 1000);
566 EVP_MD_CTX_free(mdctx
);
572 LOC_EXPORT
time_t loc_database_created_at(struct loc_database
* db
) {
573 return db
->created_at
;
576 LOC_EXPORT
const char* loc_database_get_vendor(struct loc_database
* db
) {
577 return loc_stringpool_get(db
->pool
, db
->vendor
);
580 LOC_EXPORT
const char* loc_database_get_description(struct loc_database
* db
) {
581 return loc_stringpool_get(db
->pool
, db
->description
);
584 LOC_EXPORT
const char* loc_database_get_license(struct loc_database
* db
) {
585 return loc_stringpool_get(db
->pool
, db
->license
);
588 LOC_EXPORT
size_t loc_database_count_as(struct loc_database
* db
) {
592 // Returns the AS at position pos
593 static int loc_database_fetch_as(struct loc_database
* db
, struct loc_as
** as
, off_t pos
) {
594 if ((size_t)pos
>= db
->as_count
)
597 DEBUG(db
->ctx
, "Fetching AS at position %jd\n", (intmax_t)pos
);
600 switch (db
->version
) {
601 case LOC_DATABASE_VERSION_1
:
602 r
= loc_as_new_from_database_v1(db
->ctx
, db
->pool
, as
, db
->as_v1
+ pos
);
610 DEBUG(db
->ctx
, "Got AS%u\n", loc_as_get_number(*as
));
616 // Performs a binary search to find the AS in the list
617 LOC_EXPORT
int loc_database_get_as(struct loc_database
* db
, struct loc_as
** as
, uint32_t number
) {
619 off_t hi
= db
->as_count
- 1;
622 clock_t start
= clock();
625 off_t i
= (lo
+ hi
) / 2;
627 // Fetch AS in the middle between lo and hi
628 int r
= loc_database_fetch_as(db
, as
, i
);
632 // Check if this is a match
633 uint32_t as_number
= loc_as_get_number(*as
);
634 if (as_number
== number
) {
635 clock_t end
= clock();
637 // Log how fast this has been
638 DEBUG(db
->ctx
, "Found AS%u in %.4fms\n", as_number
,
639 (double)(end
- start
) / CLOCKS_PER_SEC
* 1000);
644 // If it wasn't, we release the AS and
645 // adjust our search pointers
648 if (as_number
< number
) {
660 // Returns the network at position pos
661 static int loc_database_fetch_network(struct loc_database
* db
, struct loc_network
** network
,
662 struct in6_addr
* address
, unsigned int prefix
, off_t pos
) {
663 if ((size_t)pos
>= db
->networks_count
) {
664 DEBUG(db
->ctx
, "Network ID out of range: %jd/%jd\n",
665 (intmax_t)pos
, (intmax_t)db
->networks_count
);
670 DEBUG(db
->ctx
, "Fetching network at position %jd\n", (intmax_t)pos
);
673 switch (db
->version
) {
674 case LOC_DATABASE_VERSION_1
:
675 r
= loc_network_new_from_database_v1(db
->ctx
, network
,
676 address
, prefix
, db
->networks_v1
+ pos
);
684 char* string
= loc_network_str(*network
);
685 DEBUG(db
->ctx
, "Got network %s\n", string
);
692 static int __loc_database_node_is_leaf(const struct loc_database_network_node_v1
* node
) {
693 return (node
->network
!= htobe32(0xffffffff));
696 static int __loc_database_lookup_handle_leaf(struct loc_database
* db
, const struct in6_addr
* address
,
697 struct loc_network
** network
, struct in6_addr
* network_address
, unsigned int prefix
,
698 const struct loc_database_network_node_v1
* node
) {
699 off_t network_index
= be32toh(node
->network
);
701 DEBUG(db
->ctx
, "Handling leaf node at %jd (%jd)\n", (intmax_t)(node
- db
->network_nodes_v1
), (intmax_t)network_index
);
704 int r
= loc_database_fetch_network(db
, network
,
705 network_address
, prefix
, network_index
);
707 ERROR(db
->ctx
, "Could not fetch network %jd from database\n", (intmax_t)network_index
);
711 // Check if the given IP address is inside the network
712 r
= loc_network_match_address(*network
, address
);
714 DEBUG(db
->ctx
, "Searched address is not part of the network\n");
716 loc_network_unref(*network
);
721 // A network was found and the IP address matches
725 // Searches for an exact match along the path
726 static int __loc_database_lookup(struct loc_database
* db
, const struct in6_addr
* address
,
727 struct loc_network
** network
, struct in6_addr
* network_address
,
728 const struct loc_database_network_node_v1
* node
, unsigned int level
) {
733 int bit
= in6_addr_get_bit(address
, level
);
734 in6_addr_set_bit(network_address
, level
, bit
);
737 node_index
= be32toh(node
->zero
);
739 node_index
= be32toh(node
->one
);
741 // If the node index is zero, the tree ends here
742 // and we cannot descend any further
743 if (node_index
> 0) {
745 if ((size_t)node_index
>= db
->network_nodes_count
)
748 // Move on to the next node
749 r
= __loc_database_lookup(db
, address
, network
, network_address
,
750 db
->network_nodes_v1
+ node_index
, level
+ 1);
752 // End here if a result was found
760 DEBUG(db
->ctx
, "No match found below level %u\n", level
);
762 DEBUG(db
->ctx
, "Tree ended at level %u\n", level
);
765 // If this node has a leaf, we will check if it matches
766 if (__loc_database_node_is_leaf(node
)) {
767 r
= __loc_database_lookup_handle_leaf(db
, address
, network
, network_address
, level
, node
);
775 LOC_EXPORT
int loc_database_lookup(struct loc_database
* db
,
776 struct in6_addr
* address
, struct loc_network
** network
) {
777 struct in6_addr network_address
;
778 memset(&network_address
, 0, sizeof(network_address
));
783 clock_t start
= clock();
785 int r
= __loc_database_lookup(db
, address
, network
, &network_address
,
786 db
->network_nodes_v1
, 0);
788 clock_t end
= clock();
790 // Log how fast this has been
791 DEBUG(db
->ctx
, "Executed network search in %.4fms\n",
792 (double)(end
- start
) / CLOCKS_PER_SEC
* 1000);
797 LOC_EXPORT
int loc_database_lookup_from_string(struct loc_database
* db
,
798 const char* string
, struct loc_network
** network
) {
799 struct in6_addr address
;
801 int r
= loc_parse_address(db
->ctx
, string
, &address
);
805 return loc_database_lookup(db
, &address
, network
);
808 // Returns the country at position pos
809 static int loc_database_fetch_country(struct loc_database
* db
,
810 struct loc_country
** country
, off_t pos
) {
811 if ((size_t)pos
>= db
->countries_count
)
814 DEBUG(db
->ctx
, "Fetching country at position %jd\n", (intmax_t)pos
);
817 switch (db
->version
) {
818 case LOC_DATABASE_VERSION_1
:
819 r
= loc_country_new_from_database_v1(db
->ctx
, db
->pool
, country
, db
->countries_v1
+ pos
);
827 DEBUG(db
->ctx
, "Got country %s\n", loc_country_get_code(*country
));
833 // Performs a binary search to find the country in the list
834 LOC_EXPORT
int loc_database_get_country(struct loc_database
* db
,
835 struct loc_country
** country
, const char* code
) {
837 off_t hi
= db
->countries_count
- 1;
840 clock_t start
= clock();
843 off_t i
= (lo
+ hi
) / 2;
845 // Fetch country in the middle between lo and hi
846 int r
= loc_database_fetch_country(db
, country
, i
);
850 // Check if this is a match
851 const char* cc
= loc_country_get_code(*country
);
852 int result
= strcmp(code
, cc
);
855 clock_t end
= clock();
857 // Log how fast this has been
858 DEBUG(db
->ctx
, "Found country %s in %.4fms\n", cc
,
859 (double)(end
- start
) / CLOCKS_PER_SEC
* 1000);
864 // If it wasn't, we release the country and
865 // adjust our search pointers
866 loc_country_unref(*country
);
882 LOC_EXPORT
int loc_database_enumerator_new(struct loc_database_enumerator
** enumerator
,
883 struct loc_database
* db
, enum loc_database_enumerator_mode mode
) {
884 struct loc_database_enumerator
* e
= calloc(1, sizeof(*e
));
889 e
->ctx
= loc_ref(db
->ctx
);
890 e
->db
= loc_database_ref(db
);
894 // Initialise graph search
895 //e->network_stack[++e->network_stack_depth] = 0;
896 e
->network_stack_depth
= 1;
897 e
->networks_visited
= calloc(db
->network_nodes_count
, sizeof(*e
->networks_visited
));
899 DEBUG(e
->ctx
, "Database enumerator object allocated at %p\n", e
);
905 LOC_EXPORT
struct loc_database_enumerator
* loc_database_enumerator_ref(struct loc_database_enumerator
* enumerator
) {
906 enumerator
->refcount
++;
911 static void loc_database_enumerator_free(struct loc_database_enumerator
* enumerator
) {
912 DEBUG(enumerator
->ctx
, "Releasing database enumerator %p\n", enumerator
);
914 // Release all references
915 loc_database_unref(enumerator
->db
);
916 loc_unref(enumerator
->ctx
);
918 if (enumerator
->string
)
919 free(enumerator
->string
);
921 // Free network search
922 free(enumerator
->networks_visited
);
927 LOC_EXPORT
struct loc_database_enumerator
* loc_database_enumerator_unref(struct loc_database_enumerator
* enumerator
) {
931 if (--enumerator
->refcount
> 0)
934 loc_database_enumerator_free(enumerator
);
938 LOC_EXPORT
int loc_database_enumerator_set_string(struct loc_database_enumerator
* enumerator
, const char* string
) {
939 enumerator
->string
= strdup(string
);
941 // Make the string lowercase
942 for (char *p
= enumerator
->string
; *p
; p
++)
948 LOC_EXPORT
int loc_database_enumerator_set_country_code(struct loc_database_enumerator
* enumerator
, const char* country_code
) {
949 // Set empty country code
950 if (!country_code
|| !*country_code
) {
951 *enumerator
->country_code
= '\0';
955 // Treat A1, A2, A3 as special country codes,
956 // but perform search for flags instead
957 if (strcmp(country_code
, "A1") == 0) {
958 return loc_database_enumerator_set_flag(enumerator
,
959 LOC_NETWORK_FLAG_ANONYMOUS_PROXY
);
960 } else if (strcmp(country_code
, "A2") == 0) {
961 return loc_database_enumerator_set_flag(enumerator
,
962 LOC_NETWORK_FLAG_SATELLITE_PROVIDER
);
963 } else if (strcmp(country_code
, "A3") == 0) {
964 return loc_database_enumerator_set_flag(enumerator
,
965 LOC_NETWORK_FLAG_ANYCAST
);
968 // Country codes must be two characters
969 if (!loc_country_code_is_valid(country_code
))
972 for (unsigned int i
= 0; i
< 3; i
++) {
973 enumerator
->country_code
[i
] = country_code
[i
];
979 LOC_EXPORT
int loc_database_enumerator_set_asn(
980 struct loc_database_enumerator
* enumerator
, unsigned int asn
) {
981 enumerator
->asn
= asn
;
986 LOC_EXPORT
int loc_database_enumerator_set_flag(
987 struct loc_database_enumerator
* enumerator
, enum loc_network_flags flag
) {
988 enumerator
->flags
|= flag
;
993 LOC_EXPORT
int loc_database_enumerator_set_family(
994 struct loc_database_enumerator
* enumerator
, int family
) {
995 enumerator
->family
= family
;
1000 LOC_EXPORT
int loc_database_enumerator_next_as(
1001 struct loc_database_enumerator
* enumerator
, struct loc_as
** as
) {
1004 // Do not do anything if not in AS mode
1005 if (enumerator
->mode
!= LOC_DB_ENUMERATE_ASES
)
1008 struct loc_database
* db
= enumerator
->db
;
1010 while (enumerator
->as_index
< db
->as_count
) {
1011 // Fetch the next AS
1012 int r
= loc_database_fetch_as(db
, as
, enumerator
->as_index
++);
1016 r
= loc_as_match_string(*as
, enumerator
->string
);
1018 DEBUG(enumerator
->ctx
, "AS%d (%s) matches %s\n",
1019 loc_as_get_number(*as
), loc_as_get_name(*as
), enumerator
->string
);
1030 enumerator
->as_index
= 0;
1032 // We have searched through all of them
1036 static int loc_database_enumerator_stack_push_node(
1037 struct loc_database_enumerator
* e
, off_t offset
, int i
, int depth
) {
1038 // Do not add empty nodes
1042 // Check if there is any space left on the stack
1043 if (e
->network_stack_depth
>= MAX_STACK_DEPTH
) {
1044 ERROR(e
->ctx
, "Maximum stack size reached: %d\n", e
->network_stack_depth
);
1048 // Increase stack size
1049 int s
= ++e
->network_stack_depth
;
1051 DEBUG(e
->ctx
, "Added node %jd to stack (%d)\n", (intmax_t)offset
, depth
);
1053 e
->network_stack
[s
].offset
= offset
;
1054 e
->network_stack
[s
].i
= i
;
1055 e
->network_stack
[s
].depth
= depth
;
1060 LOC_EXPORT
int loc_database_enumerator_next_network(
1061 struct loc_database_enumerator
* enumerator
, struct loc_network
** network
) {
1065 // Do not do anything if not in network mode
1066 if (enumerator
->mode
!= LOC_DB_ENUMERATE_NETWORKS
)
1071 DEBUG(enumerator
->ctx
, "Called with a stack of %u nodes\n",
1072 enumerator
->network_stack_depth
);
1075 while (enumerator
->network_stack_depth
> 0) {
1076 DEBUG(enumerator
->ctx
, "Stack depth: %u\n", enumerator
->network_stack_depth
);
1078 // Get object from top of the stack
1079 struct loc_node_stack
* node
= &enumerator
->network_stack
[enumerator
->network_stack_depth
];
1081 // Remove the node from the stack if we have already visited it
1082 if (enumerator
->networks_visited
[node
->offset
]) {
1083 enumerator
->network_stack_depth
--;
1087 // Mark the bits on the path correctly
1088 in6_addr_set_bit(&enumerator
->network_address
,
1089 (node
->depth
> 0) ? node
->depth
- 1 : 0, node
->i
);
1091 DEBUG(enumerator
->ctx
, "Looking at node %jd\n", (intmax_t)node
->offset
);
1092 enumerator
->networks_visited
[node
->offset
]++;
1094 // Pop node from top of the stack
1095 struct loc_database_network_node_v1
* n
=
1096 enumerator
->db
->network_nodes_v1
+ node
->offset
;
1098 // Add edges to stack
1099 r
= loc_database_enumerator_stack_push_node(enumerator
,
1100 be32toh(n
->one
), 1, node
->depth
+ 1);
1105 r
= loc_database_enumerator_stack_push_node(enumerator
,
1106 be32toh(n
->zero
), 0, node
->depth
+ 1);
1111 // Check if this node is a leaf and has a network object
1112 if (__loc_database_node_is_leaf(n
)) {
1113 off_t network_index
= be32toh(n
->network
);
1115 DEBUG(enumerator
->ctx
, "Node has a network at %jd\n", (intmax_t)network_index
);
1117 // Fetch the network object
1118 r
= loc_database_fetch_network(enumerator
->db
, network
,
1119 &enumerator
->network_address
, node
->depth
, network_index
);
1121 // Break on any errors
1125 // Check if we are interested in this network
1127 // Skip if the family does not match
1128 if (enumerator
->family
&& loc_network_address_family(*network
) != enumerator
->family
) {
1129 loc_network_unref(*network
);
1135 // Skip if the country code does not match
1136 if (*enumerator
->country_code
&&
1137 !loc_network_match_country_code(*network
, enumerator
->country_code
)) {
1138 loc_network_unref(*network
);
1144 // Skip if the ASN does not match
1145 if (enumerator
->asn
&&
1146 !loc_network_match_asn(*network
, enumerator
->asn
)) {
1147 loc_network_unref(*network
);
1153 // Skip if flags do not match
1154 if (enumerator
->flags
&&
1155 !loc_network_match_flag(*network
, enumerator
->flags
)) {
1156 loc_network_unref(*network
);
1164 // Reached the end of the search
1166 // Mark all nodes as non-visited
1167 for (unsigned int i
= 0; i
< enumerator
->db
->network_nodes_count
; i
++)
1168 enumerator
->networks_visited
[i
] = 0;