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>
25 #include <sys/types.h>
29 #include <loc/libloc.h>
30 #include <loc/format.h>
32 #include "libloc-private.h"
35 #include "stringpool.h"
47 // ASes in the database
48 struct loc_database_as_v0
* as_v0
;
51 struct loc_stringpool
* pool
;
54 static int loc_database_read_magic(struct loc_database
* db
) {
55 struct loc_database_magic magic
;
58 size_t bytes_read
= fread(&magic
, 1, sizeof(magic
), db
->file
);
60 // Check if we have been able to read enough data
61 if (bytes_read
< sizeof(magic
)) {
62 ERROR(db
->ctx
, "Could not read enough data to validate magic bytes\n");
63 DEBUG(db
->ctx
, "Read %zu bytes, but needed %zu\n", bytes_read
, sizeof(magic
));
67 // Compare magic bytes
68 if (memcmp(LOC_DATABASE_MAGIC
, magic
.magic
, strlen(LOC_DATABASE_MAGIC
)) == 0) {
69 DEBUG(db
->ctx
, "Magic value matches\n");
72 db
->version
= ntohs(magic
.version
);
73 DEBUG(db
->ctx
, "Database version is %u\n", db
->version
);
78 ERROR(db
->ctx
, "Database format is not compatible\n");
84 static int loc_database_read_as_section_v0(struct loc_database
* db
,
85 off_t as_offset
, size_t as_length
) {
86 DEBUG(db
->ctx
, "Reading AS section from %jd (%zu bytes)\n", as_offset
, as_length
);
89 db
->as_v0
= mmap(NULL
, as_length
, PROT_READ
,
90 MAP_SHARED
, fileno(db
->file
), as_offset
);
92 if (db
->as_v0
== MAP_FAILED
)
96 db
->as_count
= as_length
/ sizeof(*db
->as_v0
);
98 INFO(db
->ctx
, "Read %zu ASes from the database\n", db
->as_count
);
103 static int loc_database_read_header_v0(struct loc_database
* db
) {
104 struct loc_database_header_v0 header
;
107 size_t size
= fread(&header
, 1, sizeof(header
), db
->file
);
109 if (size
< sizeof(header
)) {
110 ERROR(db
->ctx
, "Could not read enough data for header\n");
115 db
->created_at
= be64toh(header
.created_at
);
116 db
->vendor
= ntohl(header
.vendor
);
117 db
->description
= ntohl(header
.description
);
120 off_t pool_offset
= ntohl(header
.pool_offset
);
121 size_t pool_length
= ntohl(header
.pool_length
);
123 int r
= loc_stringpool_open(db
->ctx
, &db
->pool
,
124 db
->file
, pool_length
, pool_offset
);
129 off_t as_offset
= ntohl(header
.as_offset
);
130 size_t as_length
= ntohl(header
.as_length
);
132 r
= loc_database_read_as_section_v0(db
, as_offset
, as_length
);
139 static int loc_database_read_header(struct loc_database
* db
) {
140 switch (db
->version
) {
142 return loc_database_read_header_v0(db
);
145 ERROR(db
->ctx
, "Incompatible database version: %u\n", db
->version
);
150 static FILE* copy_file_pointer(FILE* f
) {
156 return fdopen(fd
, "r");
159 LOC_EXPORT
int loc_database_new(struct loc_ctx
* ctx
, struct loc_database
** database
, FILE* f
) {
160 struct loc_database
* db
= calloc(1, sizeof(*db
));
165 db
->ctx
= loc_ref(ctx
);
168 DEBUG(db
->ctx
, "Database object allocated at %p\n", db
);
170 // Copy the file pointer and work on that so we don't care if
171 // the calling function closes the file
172 db
->file
= copy_file_pointer(f
);
177 int r
= loc_database_read_magic(db
);
182 r
= loc_database_read_header(db
);
191 loc_database_unref(db
);
196 LOC_EXPORT
struct loc_database
* loc_database_ref(struct loc_database
* db
) {
202 static void loc_database_free(struct loc_database
* db
) {
203 DEBUG(db
->ctx
, "Releasing database %p\n", db
);
207 int r
= munmap(db
->as_v0
, db
->as_count
* sizeof(*db
->as_v0
));
209 ERROR(db
->ctx
, "Could not unmap AS section: %s\n", strerror(errno
));
212 loc_stringpool_unref(db
->pool
);
222 LOC_EXPORT
struct loc_database
* loc_database_unref(struct loc_database
* db
) {
223 if (--db
->refcount
> 0)
226 loc_database_free(db
);
230 LOC_EXPORT
time_t loc_database_created_at(struct loc_database
* db
) {
231 return db
->created_at
;
234 LOC_EXPORT
const char* loc_database_get_vendor(struct loc_database
* db
) {
235 return loc_stringpool_get(db
->pool
, db
->vendor
);
238 LOC_EXPORT
const char* loc_database_get_description(struct loc_database
* db
) {
239 return loc_stringpool_get(db
->pool
, db
->description
);
242 LOC_EXPORT
size_t loc_database_count_as(struct loc_database
* db
) {
246 // Returns the AS at position pos
247 static int loc_database_fetch_as(struct loc_database
* db
, struct loc_as
** as
, off_t pos
) {
248 if ((size_t)pos
>= db
->as_count
)
251 DEBUG(db
->ctx
, "Fetching AS at position %jd\n", pos
);
254 switch (db
->version
) {
256 r
= loc_as_new_from_database_v0(db
->ctx
, db
->pool
, as
, db
->as_v0
+ pos
);
264 DEBUG(db
->ctx
, "Got AS%u\n", loc_as_get_number(*as
));
270 // Performs a binary search to find the AS in the list
271 LOC_EXPORT
int loc_database_get_as(struct loc_database
* db
, struct loc_as
** as
, uint32_t number
) {
273 off_t hi
= db
->as_count
- 1;
276 clock_t start
= clock();
279 off_t i
= (lo
+ hi
) / 2;
281 // Fetch AS in the middle between lo and hi
282 int r
= loc_database_fetch_as(db
, as
, i
);
286 // Check if this is a match
287 uint32_t as_number
= loc_as_get_number(*as
);
288 if (as_number
== number
) {
289 clock_t end
= clock();
291 // Log how fast this has been
292 DEBUG(db
->ctx
, "Found AS%u in %.8fs\n", as_number
,
293 (double)(end
- start
) / CLOCKS_PER_SEC
);
298 // If it wasn't, we release the AS and
299 // adjust our search pointers
302 if (as_number
< number
) {