]>
git.ipfire.org Git - people/ms/libloc.git/blob - src/network.c
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>
28 #include <loc/libloc.h>
29 #include <loc/compat.h>
30 #include <loc/country.h>
31 #include <loc/network.h>
32 #include <loc/private.h>
39 struct in6_addr first_address
;
40 struct in6_addr last_address
;
45 enum loc_network_flags flags
;
48 static int valid_prefix(struct in6_addr
* address
, unsigned int prefix
) {
49 // The prefix cannot be larger than 128 bits
53 // And the prefix cannot be zero
57 // For IPv4-mapped addresses the prefix has to be 96 or lager
58 if (IN6_IS_ADDR_V4MAPPED(address
) && prefix
<= 96)
64 static struct in6_addr
prefix_to_bitmask(unsigned int prefix
) {
65 struct in6_addr bitmask
;
67 for (unsigned int i
= 0; i
< 16; i
++)
68 bitmask
.s6_addr
[i
] = 0;
70 for (int i
= prefix
, j
= 0; i
> 0; i
-= 8, j
++) {
72 bitmask
.s6_addr
[j
] = 0xff;
74 bitmask
.s6_addr
[j
] = 0xff << (8 - i
);
80 static struct in6_addr
make_first_address(const struct in6_addr
* address
, const struct in6_addr
* bitmask
) {
83 // Perform bitwise AND
84 for (unsigned int i
= 0; i
< 4; i
++)
85 a
.s6_addr32
[i
] = address
->s6_addr32
[i
] & bitmask
->s6_addr32
[i
];
90 static struct in6_addr
make_last_address(const struct in6_addr
* address
, const struct in6_addr
* bitmask
) {
94 for (unsigned int i
= 0; i
< 4; i
++)
95 a
.s6_addr32
[i
] = address
->s6_addr32
[i
] | ~bitmask
->s6_addr32
[i
];
100 LOC_EXPORT
int loc_network_new(struct loc_ctx
* ctx
, struct loc_network
** network
,
101 struct in6_addr
* address
, unsigned int prefix
) {
102 // Address cannot be unspecified
103 if (IN6_IS_ADDR_UNSPECIFIED(address
)) {
104 DEBUG(ctx
, "Start address is unspecified\n");
108 // Address cannot be loopback
109 if (IN6_IS_ADDR_LOOPBACK(address
)) {
110 DEBUG(ctx
, "Start address is loopback address\n");
114 // Address cannot be link-local
115 if (IN6_IS_ADDR_LINKLOCAL(address
)) {
116 DEBUG(ctx
, "Start address cannot be link-local\n");
120 // Address cannot be site-local
121 if (IN6_IS_ADDR_SITELOCAL(address
)) {
122 DEBUG(ctx
, "Start address cannot be site-local\n");
126 // Validate the prefix
127 if (valid_prefix(address
, prefix
) != 0) {
128 DEBUG(ctx
, "Invalid prefix: %u\n", prefix
);
132 struct loc_network
* n
= calloc(1, sizeof(*n
));
136 n
->ctx
= loc_ref(ctx
);
142 // Convert the prefix into a bitmask
143 struct in6_addr bitmask
= prefix_to_bitmask(n
->prefix
);
145 // Store the first and last address in the network
146 n
->first_address
= make_first_address(address
, &bitmask
);
147 n
->last_address
= make_last_address(&n
->first_address
, &bitmask
);
150 if (IN6_IS_ADDR_V4MAPPED(&n
->first_address
))
153 n
->family
= AF_INET6
;
155 DEBUG(n
->ctx
, "Network allocated at %p\n", n
);
160 LOC_EXPORT
int loc_network_new_from_string(struct loc_ctx
* ctx
, struct loc_network
** network
,
161 const char* address_string
) {
162 struct in6_addr first_address
;
164 unsigned int prefix
= 128;
167 DEBUG(ctx
, "Attempting to parse network %s\n", address_string
);
169 // Make a copy of the string to work on it
170 char* buffer
= strdup(address_string
);
171 address_string
= prefix_string
= buffer
;
173 // Split address and prefix
174 address_string
= strsep(&prefix_string
, "/");
176 DEBUG(ctx
, " Split into address = %s, prefix = %s\n", address_string
, prefix_string
);
179 r
= loc_parse_address(ctx
, address_string
, &first_address
);
181 DEBUG(ctx
, "The address could not be parsed\n");
185 // If a prefix was given, we will try to parse it
187 // Convert prefix to integer
188 prefix
= strtol(prefix_string
, NULL
, 10);
191 DEBUG(ctx
, "The prefix was not parsable: %s\n", prefix_string
);
195 // Map the prefix to IPv6 if needed
196 if (IN6_IS_ADDR_V4MAPPED(&first_address
))
201 // Free temporary buffer
204 // Exit if the parsing was unsuccessful
208 // Create a new network
209 return loc_network_new(ctx
, network
, &first_address
, prefix
);
212 LOC_EXPORT
struct loc_network
* loc_network_ref(struct loc_network
* network
) {
218 static void loc_network_free(struct loc_network
* network
) {
219 DEBUG(network
->ctx
, "Releasing network at %p\n", network
);
221 loc_unref(network
->ctx
);
225 LOC_EXPORT
struct loc_network
* loc_network_unref(struct loc_network
* network
) {
229 if (--network
->refcount
> 0)
232 loc_network_free(network
);
236 static int format_ipv6_address(const struct in6_addr
* address
, char* string
, size_t length
) {
237 const char* ret
= inet_ntop(AF_INET6
, address
, string
, length
);
244 static int format_ipv4_address(const struct in6_addr
* address
, char* string
, size_t length
) {
245 struct in_addr ipv4_address
;
246 ipv4_address
.s_addr
= address
->s6_addr32
[3];
248 const char* ret
= inet_ntop(AF_INET
, &ipv4_address
, string
, length
);
255 LOC_EXPORT
char* loc_network_str(struct loc_network
* network
) {
257 const size_t length
= INET6_ADDRSTRLEN
+ 4;
259 char* string
= malloc(length
);
263 unsigned int prefix
= network
->prefix
;
265 switch (network
->family
) {
267 r
= format_ipv6_address(&network
->first_address
, string
, length
);
271 r
= format_ipv4_address(&network
->first_address
, string
, length
);
281 ERROR(network
->ctx
, "Could not convert network to string: %s\n", strerror(errno
));
288 sprintf(string
+ strlen(string
), "/%u", prefix
);
293 LOC_EXPORT
int loc_network_address_family(struct loc_network
* network
) {
294 return network
->family
;
297 static char* loc_network_format_address(struct loc_network
* network
, const struct in6_addr
* address
) {
298 const size_t length
= INET6_ADDRSTRLEN
;
300 char* string
= malloc(length
);
306 switch (network
->family
) {
308 r
= format_ipv6_address(address
, string
, length
);
312 r
= format_ipv4_address(address
, string
, length
);
321 ERROR(network
->ctx
, "Could not format IP address to string: %s\n", strerror(errno
));
330 LOC_EXPORT
char* loc_network_format_first_address(struct loc_network
* network
) {
331 return loc_network_format_address(network
, &network
->first_address
);
334 LOC_EXPORT
char* loc_network_format_last_address(struct loc_network
* network
) {
335 return loc_network_format_address(network
, &network
->last_address
);
338 LOC_EXPORT
int loc_network_match_address(struct loc_network
* network
, const struct in6_addr
* address
) {
339 // Address must be larger than the start address
340 if (in6_addr_cmp(&network
->first_address
, address
) > 0)
343 // Address must be smaller than the last address
344 if (in6_addr_cmp(&network
->last_address
, address
) < 0)
347 // The address is inside this network
351 LOC_EXPORT
const char* loc_network_get_country_code(struct loc_network
* network
) {
352 return network
->country_code
;
355 LOC_EXPORT
int loc_network_set_country_code(struct loc_network
* network
, const char* country_code
) {
356 // Set empty country code
357 if (!country_code
|| !*country_code
) {
358 *network
->country_code
= '\0';
362 // Check country code
363 if (!loc_country_code_is_valid(country_code
))
366 loc_country_code_copy(network
->country_code
, country_code
);
371 LOC_EXPORT
int loc_network_match_country_code(struct loc_network
* network
, const char* country_code
) {
372 // Check country code
373 if (!loc_country_code_is_valid(country_code
))
376 return (network
->country_code
[0] == country_code
[0])
377 && (network
->country_code
[1] == country_code
[1]);
380 LOC_EXPORT
uint32_t loc_network_get_asn(struct loc_network
* network
) {
384 LOC_EXPORT
int loc_network_set_asn(struct loc_network
* network
, uint32_t asn
) {
390 LOC_EXPORT
int loc_network_match_asn(struct loc_network
* network
, uint32_t asn
) {
391 return network
->asn
== asn
;
394 LOC_EXPORT
int loc_network_has_flag(struct loc_network
* network
, uint32_t flag
) {
395 return network
->flags
& flag
;
398 LOC_EXPORT
int loc_network_set_flag(struct loc_network
* network
, uint32_t flag
) {
399 network
->flags
|= flag
;
404 LOC_EXPORT
int loc_network_match_flag(struct loc_network
* network
, uint32_t flag
) {
405 return loc_network_has_flag(network
, flag
);
408 LOC_EXPORT
int loc_network_is_subnet_of(struct loc_network
* self
, struct loc_network
* other
) {
409 // If the start address of the other network is smaller than this network,
410 // it cannot be a subnet.
411 if (in6_addr_cmp(&self
->first_address
, &other
->first_address
) < 0)
414 // If the end address of the other network is greater than this network,
415 // it cannot be a subnet.
416 if (in6_addr_cmp(&self
->last_address
, &other
->last_address
) > 0)
422 LOC_EXPORT
int loc_network_to_database_v1(struct loc_network
* network
, struct loc_database_network_v1
* dbobj
) {
424 loc_country_code_copy(dbobj
->country_code
, network
->country_code
);
427 dbobj
->asn
= htobe32(network
->asn
);
430 dbobj
->flags
= htobe16(network
->flags
);
435 LOC_EXPORT
int loc_network_new_from_database_v1(struct loc_ctx
* ctx
, struct loc_network
** network
,
436 struct in6_addr
* address
, unsigned int prefix
, const struct loc_database_network_v1
* dbobj
) {
437 char country_code
[3] = "\0\0";
439 int r
= loc_network_new(ctx
, network
, address
, prefix
);
441 ERROR(ctx
, "Could not allocate a new network: %s", strerror(-r
));
445 // Import country code
446 loc_country_code_copy(country_code
, dbobj
->country_code
);
448 r
= loc_network_set_country_code(*network
, country_code
);
450 ERROR(ctx
, "Could not set country code: %s\n", country_code
);
455 uint32_t asn
= be32toh(dbobj
->asn
);
456 r
= loc_network_set_asn(*network
, asn
);
458 ERROR(ctx
, "Could not set ASN: %d\n", asn
);
463 int flags
= be16toh(dbobj
->flags
);
464 r
= loc_network_set_flag(*network
, flags
);
466 ERROR(ctx
, "Could not set flags: %d\n", flags
);
473 struct loc_network_tree
{
477 struct loc_network_tree_node
* root
;
480 struct loc_network_tree_node
{
484 struct loc_network_tree_node
* zero
;
485 struct loc_network_tree_node
* one
;
487 struct loc_network
* network
;
490 LOC_EXPORT
int loc_network_tree_new(struct loc_ctx
* ctx
, struct loc_network_tree
** tree
) {
491 struct loc_network_tree
* t
= calloc(1, sizeof(*t
));
495 t
->ctx
= loc_ref(ctx
);
498 // Create the root node
499 int r
= loc_network_tree_node_new(ctx
, &t
->root
);
501 loc_network_tree_unref(t
);
505 DEBUG(t
->ctx
, "Network tree allocated at %p\n", t
);
510 LOC_EXPORT
struct loc_network_tree_node
* loc_network_tree_get_root(struct loc_network_tree
* tree
) {
511 return loc_network_tree_node_ref(tree
->root
);
514 static struct loc_network_tree_node
* loc_network_tree_get_node(struct loc_network_tree_node
* node
, int path
) {
515 struct loc_network_tree_node
** n
;
522 // If the desired node doesn't exist, yet, we will create it
524 int r
= loc_network_tree_node_new(node
->ctx
, n
);
532 static struct loc_network_tree_node
* loc_network_tree_get_path(struct loc_network_tree
* tree
, const struct in6_addr
* address
, unsigned int prefix
) {
533 struct loc_network_tree_node
* node
= tree
->root
;
535 for (unsigned int i
= 0; i
< prefix
; i
++) {
536 // Check if the ith bit is one or zero
537 node
= loc_network_tree_get_node(node
, in6_addr_get_bit(address
, i
));
543 static int __loc_network_tree_walk(struct loc_ctx
* ctx
, struct loc_network_tree_node
* node
,
544 int(*filter_callback
)(struct loc_network
* network
, void* data
),
545 int(*callback
)(struct loc_network
* network
, void* data
), void* data
) {
548 // Finding a network ends the walk here
550 if (filter_callback
) {
551 int f
= filter_callback(node
->network
, data
);
555 // Skip network if filter function returns value greater than zero
560 r
= callback(node
->network
, data
);
565 // Walk down on the left side of the tree first
567 r
= __loc_network_tree_walk(ctx
, node
->zero
, filter_callback
, callback
, data
);
572 // Then walk on the other side
574 r
= __loc_network_tree_walk(ctx
, node
->one
, filter_callback
, callback
, data
);
582 LOC_EXPORT
int loc_network_tree_walk(struct loc_network_tree
* tree
,
583 int(*filter_callback
)(struct loc_network
* network
, void* data
),
584 int(*callback
)(struct loc_network
* network
, void* data
), void* data
) {
585 return __loc_network_tree_walk(tree
->ctx
, tree
->root
, filter_callback
, callback
, data
);
588 static void loc_network_tree_free(struct loc_network_tree
* tree
) {
589 DEBUG(tree
->ctx
, "Releasing network tree at %p\n", tree
);
591 loc_network_tree_node_unref(tree
->root
);
593 loc_unref(tree
->ctx
);
597 LOC_EXPORT
struct loc_network_tree
* loc_network_tree_unref(struct loc_network_tree
* tree
) {
598 if (--tree
->refcount
> 0)
601 loc_network_tree_free(tree
);
605 static int __loc_network_tree_dump(struct loc_network
* network
, void* data
) {
606 DEBUG(network
->ctx
, "Dumping network at %p\n", network
);
608 char* s
= loc_network_str(network
);
612 INFO(network
->ctx
, "%s\n", s
);
618 LOC_EXPORT
int loc_network_tree_dump(struct loc_network_tree
* tree
) {
619 DEBUG(tree
->ctx
, "Dumping network tree at %p\n", tree
);
621 return loc_network_tree_walk(tree
, NULL
, __loc_network_tree_dump
, NULL
);
624 LOC_EXPORT
int loc_network_tree_add_network(struct loc_network_tree
* tree
, struct loc_network
* network
) {
625 DEBUG(tree
->ctx
, "Adding network %p to tree %p\n", network
, tree
);
627 struct loc_network_tree_node
* node
= loc_network_tree_get_path(tree
,
628 &network
->first_address
, network
->prefix
);
630 ERROR(tree
->ctx
, "Could not find a node\n");
634 // Check if node has not been set before
636 DEBUG(tree
->ctx
, "There is already a network at this path\n");
640 // Point node to the network
641 node
->network
= loc_network_ref(network
);
646 static int __loc_network_tree_count(struct loc_network
* network
, void* data
) {
647 size_t* counter
= (size_t*)data
;
649 // Increase the counter for each network
655 LOC_EXPORT
size_t loc_network_tree_count_networks(struct loc_network_tree
* tree
) {
658 int r
= loc_network_tree_walk(tree
, NULL
, __loc_network_tree_count
, &counter
);
665 static size_t __loc_network_tree_count_nodes(struct loc_network_tree_node
* node
) {
669 counter
+= __loc_network_tree_count_nodes(node
->zero
);
672 counter
+= __loc_network_tree_count_nodes(node
->one
);
677 LOC_EXPORT
size_t loc_network_tree_count_nodes(struct loc_network_tree
* tree
) {
678 return __loc_network_tree_count_nodes(tree
->root
);
681 LOC_EXPORT
int loc_network_tree_node_new(struct loc_ctx
* ctx
, struct loc_network_tree_node
** node
) {
682 struct loc_network_tree_node
* n
= calloc(1, sizeof(*n
));
686 n
->ctx
= loc_ref(ctx
);
689 n
->zero
= n
->one
= NULL
;
691 DEBUG(n
->ctx
, "Network node allocated at %p\n", n
);
696 LOC_EXPORT
struct loc_network_tree_node
* loc_network_tree_node_ref(struct loc_network_tree_node
* node
) {
703 static void loc_network_tree_node_free(struct loc_network_tree_node
* node
) {
704 DEBUG(node
->ctx
, "Releasing network node at %p\n", node
);
707 loc_network_unref(node
->network
);
710 loc_network_tree_node_unref(node
->zero
);
713 loc_network_tree_node_unref(node
->one
);
715 loc_unref(node
->ctx
);
719 LOC_EXPORT
struct loc_network_tree_node
* loc_network_tree_node_unref(struct loc_network_tree_node
* node
) {
723 if (--node
->refcount
> 0)
726 loc_network_tree_node_free(node
);
730 LOC_EXPORT
struct loc_network_tree_node
* loc_network_tree_node_get(struct loc_network_tree_node
* node
, unsigned int index
) {
739 return loc_network_tree_node_ref(node
);
742 LOC_EXPORT
int loc_network_tree_node_is_leaf(struct loc_network_tree_node
* node
) {
743 return (!!node
->network
);
746 LOC_EXPORT
struct loc_network
* loc_network_tree_node_get_network(struct loc_network_tree_node
* node
) {
747 return loc_network_ref(node
->network
);