]>
Commit | Line | Data |
---|---|---|
2601e83e MT |
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 | ||
0676cd80 | 17 | #include <endian.h> |
2601e83e MT |
18 | #include <errno.h> |
19 | #include <stddef.h> | |
20 | #include <stdint.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
c182393f | 24 | #include <sys/mman.h> |
2601e83e | 25 | #include <sys/types.h> |
96ea74a5 | 26 | #include <time.h> |
3f35869a | 27 | #include <unistd.h> |
2601e83e MT |
28 | |
29 | #include <loc/libloc.h> | |
a5db3e49 | 30 | #include <loc/format.h> |
2601e83e MT |
31 | |
32 | #include "libloc-private.h" | |
a5db3e49 | 33 | #include "as.h" |
2601e83e MT |
34 | #include "database.h" |
35 | #include "stringpool.h" | |
36 | ||
37 | struct loc_database { | |
38 | struct loc_ctx* ctx; | |
39 | int refcount; | |
40 | ||
41 | unsigned int version; | |
96ea74a5 | 42 | time_t created_at; |
2601e83e MT |
43 | off_t vendor; |
44 | off_t description; | |
45 | ||
a5db3e49 | 46 | // ASes in the database |
c182393f | 47 | struct loc_database_as_v0* as_v0; |
a5db3e49 MT |
48 | size_t as_count; |
49 | ||
2601e83e MT |
50 | struct loc_stringpool* pool; |
51 | }; | |
52 | ||
a7431f1a | 53 | static int loc_database_read_magic(struct loc_database* db, FILE* f) { |
2601e83e MT |
54 | struct loc_database_magic magic; |
55 | ||
56 | // Read from file | |
a7431f1a | 57 | size_t bytes_read = fread(&magic, 1, sizeof(magic), f); |
2601e83e MT |
58 | |
59 | // Check if we have been able to read enough data | |
60 | if (bytes_read < sizeof(magic)) { | |
61 | ERROR(db->ctx, "Could not read enough data to validate magic bytes\n"); | |
62 | DEBUG(db->ctx, "Read %zu bytes, but needed %zu\n", bytes_read, sizeof(magic)); | |
63 | return -ENOMSG; | |
64 | } | |
65 | ||
66 | // Compare magic bytes | |
67 | if (memcmp(LOC_DATABASE_MAGIC, magic.magic, strlen(LOC_DATABASE_MAGIC)) == 0) { | |
68 | DEBUG(db->ctx, "Magic value matches\n"); | |
69 | ||
70 | // Parse version | |
0676cd80 | 71 | db->version = be16toh(magic.version); |
2601e83e MT |
72 | DEBUG(db->ctx, "Database version is %u\n", db->version); |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | ERROR(db->ctx, "Database format is not compatible\n"); | |
78 | ||
79 | // Return an error | |
80 | return 1; | |
81 | } | |
82 | ||
a5db3e49 | 83 | static int loc_database_read_as_section_v0(struct loc_database* db, |
a7431f1a | 84 | FILE* f, off_t as_offset, size_t as_length) { |
c182393f | 85 | DEBUG(db->ctx, "Reading AS section from %jd (%zu bytes)\n", as_offset, as_length); |
a5db3e49 | 86 | |
c182393f MT |
87 | if (as_length > 0) { |
88 | db->as_v0 = mmap(NULL, as_length, PROT_READ, | |
a7431f1a | 89 | MAP_SHARED, fileno(f), as_offset); |
a5db3e49 | 90 | |
c182393f MT |
91 | if (db->as_v0 == MAP_FAILED) |
92 | return -errno; | |
a5db3e49 MT |
93 | } |
94 | ||
c182393f MT |
95 | db->as_count = as_length / sizeof(*db->as_v0); |
96 | ||
a5db3e49 MT |
97 | INFO(db->ctx, "Read %zu ASes from the database\n", db->as_count); |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
a7431f1a | 102 | static int loc_database_read_header_v0(struct loc_database* db, FILE* f) { |
2601e83e MT |
103 | struct loc_database_header_v0 header; |
104 | ||
105 | // Read from file | |
a7431f1a | 106 | size_t size = fread(&header, 1, sizeof(header), f); |
2601e83e MT |
107 | |
108 | if (size < sizeof(header)) { | |
109 | ERROR(db->ctx, "Could not read enough data for header\n"); | |
110 | return -ENOMSG; | |
111 | } | |
112 | ||
113 | // Copy over data | |
96ea74a5 | 114 | db->created_at = be64toh(header.created_at); |
0676cd80 MT |
115 | db->vendor = be32toh(header.vendor); |
116 | db->description = be32toh(header.description); | |
2601e83e MT |
117 | |
118 | // Open pool | |
0676cd80 MT |
119 | off_t pool_offset = be32toh(header.pool_offset); |
120 | size_t pool_length = be32toh(header.pool_length); | |
2601e83e | 121 | |
0e974d4b | 122 | int r = loc_stringpool_open(db->ctx, &db->pool, |
a7431f1a | 123 | f, pool_length, pool_offset); |
2601e83e MT |
124 | if (r) |
125 | return r; | |
126 | ||
a5db3e49 | 127 | // AS section |
0676cd80 MT |
128 | off_t as_offset = be32toh(header.as_offset); |
129 | size_t as_length = be32toh(header.as_length); | |
a5db3e49 | 130 | |
a7431f1a | 131 | r = loc_database_read_as_section_v0(db, f, as_offset, as_length); |
a5db3e49 MT |
132 | if (r) |
133 | return r; | |
134 | ||
2601e83e MT |
135 | return 0; |
136 | } | |
137 | ||
a7431f1a | 138 | static int loc_database_read_header(struct loc_database* db, FILE* f) { |
2601e83e MT |
139 | switch (db->version) { |
140 | case 0: | |
a7431f1a | 141 | return loc_database_read_header_v0(db, f); |
2601e83e MT |
142 | |
143 | default: | |
144 | ERROR(db->ctx, "Incompatible database version: %u\n", db->version); | |
145 | return 1; | |
146 | } | |
147 | } | |
148 | ||
a7431f1a | 149 | static int loc_database_read(struct loc_database* db, FILE* f) { |
02879100 MT |
150 | clock_t start = clock(); |
151 | ||
152 | // Read magic bytes | |
a7431f1a | 153 | int r = loc_database_read_magic(db, f); |
02879100 MT |
154 | if (r) |
155 | return r; | |
156 | ||
157 | // Read the header | |
a7431f1a | 158 | r = loc_database_read_header(db, f); |
02879100 MT |
159 | if (r) |
160 | return r; | |
161 | ||
162 | clock_t end = clock(); | |
163 | ||
164 | INFO(db->ctx, "Opened database in %.8fs\n", | |
165 | (double)(end - start) / CLOCKS_PER_SEC); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
c182393f | 170 | LOC_EXPORT int loc_database_new(struct loc_ctx* ctx, struct loc_database** database, FILE* f) { |
a7431f1a MT |
171 | // Fail on invalid file handle |
172 | if (!f) | |
173 | return -EINVAL; | |
174 | ||
c182393f MT |
175 | struct loc_database* db = calloc(1, sizeof(*db)); |
176 | if (!db) | |
177 | return -ENOMEM; | |
178 | ||
179 | // Reference context | |
180 | db->ctx = loc_ref(ctx); | |
181 | db->refcount = 1; | |
182 | ||
183 | DEBUG(db->ctx, "Database object allocated at %p\n", db); | |
184 | ||
a7431f1a | 185 | int r = loc_database_read(db, f); |
02879100 MT |
186 | if (r) { |
187 | loc_database_unref(db); | |
2601e83e | 188 | return r; |
02879100 | 189 | } |
2601e83e | 190 | |
c182393f MT |
191 | *database = db; |
192 | ||
2601e83e | 193 | return 0; |
2601e83e MT |
194 | } |
195 | ||
c182393f MT |
196 | LOC_EXPORT struct loc_database* loc_database_ref(struct loc_database* db) { |
197 | db->refcount++; | |
198 | ||
199 | return db; | |
8f5b676a MT |
200 | } |
201 | ||
c182393f MT |
202 | static void loc_database_free(struct loc_database* db) { |
203 | DEBUG(db->ctx, "Releasing database %p\n", db); | |
c34e76f1 | 204 | |
c182393f MT |
205 | // Removing all ASes |
206 | if (db->as_v0) { | |
207 | int r = munmap(db->as_v0, db->as_count * sizeof(*db->as_v0)); | |
208 | if (r) | |
209 | ERROR(db->ctx, "Could not unmap AS section: %s\n", strerror(errno)); | |
210 | } | |
c34e76f1 | 211 | |
c182393f | 212 | loc_stringpool_unref(db->pool); |
c34e76f1 | 213 | |
c182393f MT |
214 | loc_unref(db->ctx); |
215 | free(db); | |
c34e76f1 MT |
216 | } |
217 | ||
c182393f MT |
218 | LOC_EXPORT struct loc_database* loc_database_unref(struct loc_database* db) { |
219 | if (--db->refcount > 0) | |
220 | return NULL; | |
78ace4ed | 221 | |
c182393f MT |
222 | loc_database_free(db); |
223 | return NULL; | |
224 | } | |
78ace4ed | 225 | |
c182393f MT |
226 | LOC_EXPORT time_t loc_database_created_at(struct loc_database* db) { |
227 | return db->created_at; | |
228 | } | |
78ace4ed | 229 | |
c182393f MT |
230 | LOC_EXPORT const char* loc_database_get_vendor(struct loc_database* db) { |
231 | return loc_stringpool_get(db->pool, db->vendor); | |
232 | } | |
78ace4ed | 233 | |
c182393f MT |
234 | LOC_EXPORT const char* loc_database_get_description(struct loc_database* db) { |
235 | return loc_stringpool_get(db->pool, db->description); | |
236 | } | |
78ace4ed | 237 | |
c182393f MT |
238 | LOC_EXPORT size_t loc_database_count_as(struct loc_database* db) { |
239 | return db->as_count; | |
78ace4ed MT |
240 | } |
241 | ||
c182393f MT |
242 | // Returns the AS at position pos |
243 | static int loc_database_fetch_as(struct loc_database* db, struct loc_as** as, off_t pos) { | |
244 | if ((size_t)pos >= db->as_count) | |
245 | return -EINVAL; | |
2601e83e | 246 | |
c182393f | 247 | DEBUG(db->ctx, "Fetching AS at position %jd\n", pos); |
2601e83e MT |
248 | |
249 | int r; | |
c182393f MT |
250 | switch (db->version) { |
251 | case 0: | |
252 | r = loc_as_new_from_database_v0(db->ctx, db->pool, as, db->as_v0 + pos); | |
253 | break; | |
2601e83e | 254 | |
c182393f MT |
255 | default: |
256 | return -1; | |
257 | } | |
2601e83e | 258 | |
c182393f MT |
259 | if (r == 0) { |
260 | DEBUG(db->ctx, "Got AS%u\n", loc_as_get_number(*as)); | |
2601e83e | 261 | } |
2601e83e | 262 | |
c182393f MT |
263 | return r; |
264 | } | |
c34e76f1 | 265 | |
c182393f MT |
266 | // Performs a binary search to find the AS in the list |
267 | LOC_EXPORT int loc_database_get_as(struct loc_database* db, struct loc_as** as, uint32_t number) { | |
268 | off_t lo = 0; | |
269 | off_t hi = db->as_count - 1; | |
c34e76f1 | 270 | |
8f3e2a06 MT |
271 | // Save start time |
272 | clock_t start = clock(); | |
273 | ||
c182393f MT |
274 | while (lo <= hi) { |
275 | off_t i = (lo + hi) / 2; | |
8f5b676a | 276 | |
c182393f MT |
277 | // Fetch AS in the middle between lo and hi |
278 | int r = loc_database_fetch_as(db, as, i); | |
279 | if (r) | |
280 | return r; | |
a5db3e49 | 281 | |
c182393f MT |
282 | // Check if this is a match |
283 | uint32_t as_number = loc_as_get_number(*as); | |
8f3e2a06 MT |
284 | if (as_number == number) { |
285 | clock_t end = clock(); | |
286 | ||
287 | // Log how fast this has been | |
288 | DEBUG(db->ctx, "Found AS%u in %.8fs\n", as_number, | |
289 | (double)(end - start) / CLOCKS_PER_SEC); | |
290 | ||
c182393f | 291 | return 0; |
8f3e2a06 | 292 | } |
c182393f MT |
293 | |
294 | // If it wasn't, we release the AS and | |
295 | // adjust our search pointers | |
296 | loc_as_unref(*as); | |
297 | ||
298 | if (as_number < number) { | |
299 | lo = i + 1; | |
300 | } else | |
301 | hi = i - 1; | |
302 | } | |
2601e83e | 303 | |
c182393f MT |
304 | // Nothing found |
305 | *as = NULL; | |
2601e83e | 306 | |
8f3e2a06 | 307 | return 1; |
2601e83e | 308 | } |