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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 | ||
17 | #include <arpa/inet.h> | |
18 | #include <errno.h> | |
19 | #include <stddef.h> | |
20 | #include <stdint.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <sys/types.h> | |
25 | ||
26 | #include <loc/libloc.h> | |
a5db3e49 | 27 | #include <loc/format.h> |
2601e83e MT |
28 | |
29 | #include "libloc-private.h" | |
a5db3e49 | 30 | #include "as.h" |
2601e83e MT |
31 | #include "database.h" |
32 | #include "stringpool.h" | |
33 | ||
34 | struct loc_database { | |
35 | struct loc_ctx* ctx; | |
36 | int refcount; | |
37 | ||
38 | unsigned int version; | |
39 | off_t vendor; | |
40 | off_t description; | |
41 | ||
a5db3e49 MT |
42 | // ASes in the database |
43 | struct loc_as** as; | |
44 | size_t as_count; | |
45 | ||
2601e83e MT |
46 | struct loc_stringpool* pool; |
47 | }; | |
48 | ||
2601e83e MT |
49 | LOC_EXPORT int loc_database_new(struct loc_ctx* ctx, struct loc_database** database, size_t pool_size) { |
50 | struct loc_database* db = calloc(1, sizeof(*db)); | |
51 | if (!db) | |
52 | return -ENOMEM; | |
53 | ||
54 | // Reference context | |
55 | db->ctx = loc_ref(ctx); | |
56 | db->refcount = 1; | |
57 | ||
58 | DEBUG(db->ctx, "Database allocated at %p\n", db); | |
59 | ||
60 | // Create string pool | |
61 | int r = loc_stringpool_new(db->ctx, &db->pool, pool_size); | |
62 | if (r) { | |
63 | loc_database_unref(db); | |
64 | return r; | |
65 | } | |
66 | ||
67 | *database = db; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | LOC_EXPORT int loc_database_open(struct loc_ctx* ctx, struct loc_database** database, FILE* f) { | |
73 | int r = loc_database_new(ctx, database, 0); | |
74 | if (r) | |
75 | return r; | |
76 | ||
77 | return loc_database_read(*database, f); | |
78 | } | |
79 | ||
80 | LOC_EXPORT struct loc_database* loc_database_ref(struct loc_database* db) { | |
81 | db->refcount++; | |
82 | ||
83 | return db; | |
84 | } | |
85 | ||
86 | static void loc_database_free(struct loc_database* db) { | |
87 | DEBUG(db->ctx, "Releasing database %p\n", db); | |
88 | ||
a5db3e49 MT |
89 | // Remove references to all ASes |
90 | if (db->as) { | |
91 | for (unsigned int i = 0; i < db->as_count; i++) { | |
92 | loc_as_unref(db->as[i]); | |
93 | } | |
94 | free(db->as); | |
95 | } | |
96 | ||
2601e83e MT |
97 | loc_stringpool_unref(db->pool); |
98 | ||
99 | loc_unref(db->ctx); | |
100 | free(db); | |
101 | } | |
102 | ||
103 | LOC_EXPORT struct loc_database* loc_database_unref(struct loc_database* db) { | |
104 | if (--db->refcount > 0) | |
105 | return NULL; | |
106 | ||
107 | loc_database_free(db); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | LOC_EXPORT const char* loc_database_get_vendor(struct loc_database* db) { | |
112 | return loc_stringpool_get(db->pool, db->vendor); | |
113 | } | |
114 | ||
115 | LOC_EXPORT int loc_database_set_vendor(struct loc_database* db, const char* vendor) { | |
116 | // Add the string to the string pool | |
117 | off_t offset = loc_stringpool_add(db->pool, vendor); | |
118 | if (offset < 0) | |
119 | return offset; | |
120 | ||
121 | db->vendor = offset; | |
122 | return 0; | |
123 | } | |
124 | ||
125 | LOC_EXPORT const char* loc_database_get_description(struct loc_database* db) { | |
126 | return loc_stringpool_get(db->pool, db->description); | |
127 | } | |
128 | ||
129 | LOC_EXPORT int loc_database_set_description(struct loc_database* db, const char* description) { | |
130 | // Add the string to the string pool | |
131 | off_t offset = loc_stringpool_add(db->pool, description); | |
132 | if (offset < 0) | |
133 | return offset; | |
134 | ||
135 | db->description = offset; | |
136 | return 0; | |
137 | } | |
138 | ||
a5db3e49 MT |
139 | LOC_EXPORT size_t loc_database_count_as(struct loc_database* db) { |
140 | return db->as_count; | |
141 | } | |
142 | ||
143 | static int loc_database_has_as(struct loc_database* db, struct loc_as* as) { | |
144 | for (unsigned int i = 0; i < db->as_count; i++) { | |
145 | if (loc_as_cmp(as, db->as[i]) == 0) | |
146 | return i; | |
147 | } | |
148 | ||
149 | return -1; | |
150 | } | |
151 | ||
152 | static int __loc_as_cmp(const void* as1, const void* as2) { | |
153 | return loc_as_cmp(*(struct loc_as**)as1, *(struct loc_as**)as2); | |
154 | } | |
155 | ||
156 | static void loc_database_sort_ases(struct loc_database* db) { | |
157 | qsort(db->as, db->as_count, sizeof(*db->as), __loc_as_cmp); | |
158 | } | |
159 | ||
160 | static struct loc_as* __loc_database_add_as(struct loc_database* db, struct loc_as* as) { | |
161 | // Check if AS exists already | |
162 | int i = loc_database_has_as(db, as); | |
163 | if (i >= 0) { | |
164 | loc_as_unref(as); | |
165 | ||
166 | // Select already existing AS | |
167 | as = db->as[i]; | |
168 | ||
169 | return loc_as_ref(as); | |
170 | } | |
171 | ||
172 | db->as_count++; | |
173 | ||
174 | // Make space for the new entry | |
175 | db->as = realloc(db->as, sizeof(*db->as) * db->as_count); | |
176 | ||
177 | // Add the new entry at the end | |
178 | db->as[db->as_count - 1] = loc_as_ref(as); | |
179 | ||
180 | // Sort everything | |
181 | loc_database_sort_ases(db); | |
182 | ||
183 | return as; | |
184 | } | |
185 | ||
186 | LOC_EXPORT struct loc_as* loc_database_add_as(struct loc_database* db, uint32_t number) { | |
187 | struct loc_as* as; | |
188 | int r = loc_as_new(db->ctx, db->pool, &as, number); | |
189 | if (r) | |
190 | return NULL; | |
191 | ||
192 | return __loc_database_add_as(db, as); | |
193 | } | |
194 | ||
2601e83e MT |
195 | static int loc_database_read_magic(struct loc_database* db, FILE* f) { |
196 | struct loc_database_magic magic; | |
197 | ||
198 | // Read from file | |
199 | size_t bytes_read = fread(&magic, 1, sizeof(magic), f); | |
200 | ||
201 | // Check if we have been able to read enough data | |
202 | if (bytes_read < sizeof(magic)) { | |
203 | ERROR(db->ctx, "Could not read enough data to validate magic bytes\n"); | |
204 | DEBUG(db->ctx, "Read %zu bytes, but needed %zu\n", bytes_read, sizeof(magic)); | |
205 | return -ENOMSG; | |
206 | } | |
207 | ||
208 | // Compare magic bytes | |
209 | if (memcmp(LOC_DATABASE_MAGIC, magic.magic, strlen(LOC_DATABASE_MAGIC)) == 0) { | |
210 | DEBUG(db->ctx, "Magic value matches\n"); | |
211 | ||
212 | // Parse version | |
213 | db->version = ntohs(magic.version); | |
214 | DEBUG(db->ctx, "Database version is %u\n", db->version); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | ERROR(db->ctx, "Database format is not compatible\n"); | |
220 | ||
221 | // Return an error | |
222 | return 1; | |
223 | } | |
224 | ||
a5db3e49 MT |
225 | static int loc_database_read_as_section_v0(struct loc_database* db, |
226 | off_t as_offset, size_t as_length, FILE* f) { | |
227 | struct loc_database_as_v0 dbobj; | |
228 | ||
229 | // Read from the start of the section | |
230 | int r = fseek(f, as_offset, SEEK_SET); | |
231 | if (r) | |
232 | return r; | |
233 | ||
234 | // Read all ASes | |
235 | size_t as_count = as_length / sizeof(dbobj); | |
236 | for (unsigned int i = 0; i < as_count; i++) { | |
237 | size_t bytes_read = fread(&dbobj, 1, sizeof(dbobj), f); | |
238 | if (bytes_read < sizeof(dbobj)) { | |
239 | ERROR(db->ctx, "Could not read an AS object\n"); | |
240 | return -ENOMSG; | |
241 | } | |
242 | ||
243 | // Allocate a new AS | |
244 | struct loc_as* as; | |
245 | r = loc_as_new_from_database_v0(db->ctx, db->pool, &as, &dbobj); | |
246 | if (r) | |
247 | return r; | |
248 | ||
249 | // Attach it to the database | |
250 | as = __loc_database_add_as(db, as); | |
251 | loc_as_unref(as); | |
252 | } | |
253 | ||
254 | INFO(db->ctx, "Read %zu ASes from the database\n", db->as_count); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
2601e83e MT |
259 | static int loc_database_read_header_v0(struct loc_database* db, FILE* f) { |
260 | struct loc_database_header_v0 header; | |
261 | ||
262 | // Read from file | |
263 | size_t size = fread(&header, 1, sizeof(header), f); | |
264 | ||
265 | if (size < sizeof(header)) { | |
266 | ERROR(db->ctx, "Could not read enough data for header\n"); | |
267 | return -ENOMSG; | |
268 | } | |
269 | ||
270 | // Copy over data | |
271 | db->vendor = ntohl(header.vendor); | |
272 | db->description = ntohl(header.description); | |
273 | ||
274 | // Open pool | |
275 | off_t pool_offset = ntohl(header.pool_offset); | |
276 | size_t pool_length = ntohl(header.pool_length); | |
277 | ||
278 | int r = loc_stringpool_read(db->pool, f, pool_offset, pool_length); | |
279 | if (r) | |
280 | return r; | |
281 | ||
a5db3e49 MT |
282 | // AS section |
283 | off_t as_offset = ntohl(header.as_offset); | |
284 | size_t as_length = ntohl(header.as_length); | |
285 | ||
286 | r = loc_database_read_as_section_v0(db, as_offset, as_length, f); | |
287 | if (r) | |
288 | return r; | |
289 | ||
2601e83e MT |
290 | return 0; |
291 | } | |
292 | ||
293 | static int loc_database_read_header(struct loc_database* db, FILE* f) { | |
294 | switch (db->version) { | |
295 | case 0: | |
296 | return loc_database_read_header_v0(db, f); | |
297 | ||
298 | default: | |
299 | ERROR(db->ctx, "Incompatible database version: %u\n", db->version); | |
300 | return 1; | |
301 | } | |
302 | } | |
303 | ||
304 | LOC_EXPORT int loc_database_read(struct loc_database* db, FILE* f) { | |
305 | int r = fseek(f, 0, SEEK_SET); | |
306 | if (r) | |
307 | return r; | |
308 | ||
309 | // Read magic bytes | |
310 | r = loc_database_read_magic(db, f); | |
311 | if (r) | |
312 | return r; | |
313 | ||
314 | // Read the header | |
315 | r = loc_database_read_header(db, f); | |
316 | if (r) | |
317 | return r; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static void loc_database_make_magic(struct loc_database* db, struct loc_database_magic* magic) { | |
323 | // Copy magic bytes | |
324 | for (unsigned int i = 0; i < strlen(LOC_DATABASE_MAGIC); i++) | |
325 | magic->magic[i] = LOC_DATABASE_MAGIC[i]; | |
326 | ||
327 | // Set version | |
328 | magic->version = htons(LOC_DATABASE_VERSION); | |
329 | } | |
330 | ||
331 | LOC_EXPORT int loc_database_write(struct loc_database* db, FILE* f) { | |
332 | struct loc_database_magic magic; | |
333 | loc_database_make_magic(db, &magic); | |
334 | ||
335 | // Make the header | |
336 | struct loc_database_header_v0 header; | |
337 | header.vendor = htonl(db->vendor); | |
338 | header.description = htonl(db->description); | |
339 | ||
340 | int r; | |
341 | off_t offset = 0; | |
342 | ||
343 | // Start writing at the beginning of the file | |
344 | r = fseek(f, 0, SEEK_SET); | |
345 | if (r) | |
346 | return r; | |
347 | ||
348 | // Write the magic | |
349 | offset += fwrite(&magic, 1, sizeof(magic), f); | |
350 | ||
351 | // Skip the space we need to write the header later | |
352 | r = fseek(f, sizeof(header), SEEK_CUR); | |
353 | if (r) { | |
354 | DEBUG(db->ctx, "Could not seek to position after header\n"); | |
355 | return r; | |
356 | } | |
357 | offset += sizeof(header); | |
358 | ||
a5db3e49 MT |
359 | // Write all ASes |
360 | header.as_offset = htonl(offset); | |
361 | ||
362 | struct loc_database_as_v0 dbas; | |
363 | for (unsigned int i = 0; i < db->as_count; i++) { | |
364 | // Convert AS into database format | |
365 | loc_as_to_database_v0(db->as[i], &dbas); | |
366 | ||
367 | // Write to disk | |
368 | offset += fwrite(&dbas, 1, sizeof(dbas), f); | |
369 | } | |
370 | header.as_length = htonl(db->as_count * sizeof(dbas)); | |
371 | ||
2601e83e MT |
372 | // Save the offset of the pool section |
373 | DEBUG(db->ctx, "Pool starts at %jd bytes\n", offset); | |
374 | header.pool_offset = htonl(offset); | |
375 | ||
376 | // Size of the pool | |
377 | size_t pool_length = loc_stringpool_write(db->pool, f); | |
378 | DEBUG(db->ctx, "Pool has a length of %zu bytes\n", pool_length); | |
379 | header.pool_length = htonl(pool_length); | |
380 | ||
381 | // Write the header | |
382 | r = fseek(f, sizeof(magic), SEEK_SET); | |
383 | if (r) | |
384 | return r; | |
385 | ||
386 | offset += fwrite(&header, 1, sizeof(header), f); | |
387 | ||
388 | return 0; | |
389 | } |