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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> | |
96ea74a5 | 25 | #include <time.h> |
3f35869a | 26 | #include <unistd.h> |
2601e83e MT |
27 | |
28 | #include <loc/libloc.h> | |
a5db3e49 | 29 | #include <loc/format.h> |
2601e83e MT |
30 | |
31 | #include "libloc-private.h" | |
a5db3e49 | 32 | #include "as.h" |
2601e83e MT |
33 | #include "database.h" |
34 | #include "stringpool.h" | |
35 | ||
36 | struct loc_database { | |
37 | struct loc_ctx* ctx; | |
38 | int refcount; | |
39 | ||
3f35869a | 40 | FILE* file; |
2601e83e | 41 | unsigned int version; |
96ea74a5 | 42 | time_t created_at; |
2601e83e MT |
43 | off_t vendor; |
44 | off_t description; | |
45 | ||
a5db3e49 MT |
46 | // ASes in the database |
47 | struct loc_as** as; | |
48 | size_t as_count; | |
49 | ||
2601e83e MT |
50 | struct loc_stringpool* pool; |
51 | }; | |
52 | ||
2601e83e MT |
53 | LOC_EXPORT int loc_database_new(struct loc_ctx* ctx, struct loc_database** database, size_t pool_size) { |
54 | struct loc_database* db = calloc(1, sizeof(*db)); | |
55 | if (!db) | |
56 | return -ENOMEM; | |
57 | ||
58 | // Reference context | |
59 | db->ctx = loc_ref(ctx); | |
60 | db->refcount = 1; | |
61 | ||
96ea74a5 MT |
62 | // Save creation time |
63 | db->created_at = time(NULL); | |
64 | ||
2601e83e MT |
65 | DEBUG(db->ctx, "Database allocated at %p\n", db); |
66 | ||
67 | // Create string pool | |
68 | int r = loc_stringpool_new(db->ctx, &db->pool, pool_size); | |
69 | if (r) { | |
70 | loc_database_unref(db); | |
71 | return r; | |
72 | } | |
73 | ||
74 | *database = db; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | LOC_EXPORT int loc_database_open(struct loc_ctx* ctx, struct loc_database** database, FILE* f) { | |
80 | int r = loc_database_new(ctx, database, 0); | |
81 | if (r) | |
82 | return r; | |
83 | ||
84 | return loc_database_read(*database, f); | |
85 | } | |
86 | ||
87 | LOC_EXPORT struct loc_database* loc_database_ref(struct loc_database* db) { | |
88 | db->refcount++; | |
89 | ||
90 | return db; | |
91 | } | |
92 | ||
93 | static void loc_database_free(struct loc_database* db) { | |
94 | DEBUG(db->ctx, "Releasing database %p\n", db); | |
95 | ||
a5db3e49 MT |
96 | // Remove references to all ASes |
97 | if (db->as) { | |
98 | for (unsigned int i = 0; i < db->as_count; i++) { | |
99 | loc_as_unref(db->as[i]); | |
100 | } | |
101 | free(db->as); | |
102 | } | |
103 | ||
2601e83e MT |
104 | loc_stringpool_unref(db->pool); |
105 | ||
3f35869a MT |
106 | // Close file |
107 | if (db->file) | |
108 | fclose(db->file); | |
109 | ||
2601e83e MT |
110 | loc_unref(db->ctx); |
111 | free(db); | |
112 | } | |
113 | ||
114 | LOC_EXPORT struct loc_database* loc_database_unref(struct loc_database* db) { | |
115 | if (--db->refcount > 0) | |
116 | return NULL; | |
117 | ||
118 | loc_database_free(db); | |
119 | return NULL; | |
120 | } | |
121 | ||
96ea74a5 MT |
122 | LOC_EXPORT time_t loc_database_created_at(struct loc_database* db) { |
123 | return db->created_at; | |
124 | } | |
125 | ||
2601e83e MT |
126 | LOC_EXPORT const char* loc_database_get_vendor(struct loc_database* db) { |
127 | return loc_stringpool_get(db->pool, db->vendor); | |
128 | } | |
129 | ||
130 | LOC_EXPORT int loc_database_set_vendor(struct loc_database* db, const char* vendor) { | |
131 | // Add the string to the string pool | |
132 | off_t offset = loc_stringpool_add(db->pool, vendor); | |
133 | if (offset < 0) | |
134 | return offset; | |
135 | ||
136 | db->vendor = offset; | |
137 | return 0; | |
138 | } | |
139 | ||
140 | LOC_EXPORT const char* loc_database_get_description(struct loc_database* db) { | |
141 | return loc_stringpool_get(db->pool, db->description); | |
142 | } | |
143 | ||
144 | LOC_EXPORT int loc_database_set_description(struct loc_database* db, const char* description) { | |
145 | // Add the string to the string pool | |
146 | off_t offset = loc_stringpool_add(db->pool, description); | |
147 | if (offset < 0) | |
148 | return offset; | |
149 | ||
150 | db->description = offset; | |
151 | return 0; | |
152 | } | |
153 | ||
a5db3e49 MT |
154 | LOC_EXPORT size_t loc_database_count_as(struct loc_database* db) { |
155 | return db->as_count; | |
156 | } | |
157 | ||
158 | static int loc_database_has_as(struct loc_database* db, struct loc_as* as) { | |
159 | for (unsigned int i = 0; i < db->as_count; i++) { | |
160 | if (loc_as_cmp(as, db->as[i]) == 0) | |
161 | return i; | |
162 | } | |
163 | ||
164 | return -1; | |
165 | } | |
166 | ||
167 | static int __loc_as_cmp(const void* as1, const void* as2) { | |
168 | return loc_as_cmp(*(struct loc_as**)as1, *(struct loc_as**)as2); | |
169 | } | |
170 | ||
171 | static void loc_database_sort_ases(struct loc_database* db) { | |
172 | qsort(db->as, db->as_count, sizeof(*db->as), __loc_as_cmp); | |
173 | } | |
174 | ||
175 | static struct loc_as* __loc_database_add_as(struct loc_database* db, struct loc_as* as) { | |
176 | // Check if AS exists already | |
177 | int i = loc_database_has_as(db, as); | |
178 | if (i >= 0) { | |
179 | loc_as_unref(as); | |
180 | ||
181 | // Select already existing AS | |
182 | as = db->as[i]; | |
183 | ||
184 | return loc_as_ref(as); | |
185 | } | |
186 | ||
187 | db->as_count++; | |
188 | ||
189 | // Make space for the new entry | |
190 | db->as = realloc(db->as, sizeof(*db->as) * db->as_count); | |
191 | ||
192 | // Add the new entry at the end | |
193 | db->as[db->as_count - 1] = loc_as_ref(as); | |
194 | ||
195 | // Sort everything | |
196 | loc_database_sort_ases(db); | |
197 | ||
198 | return as; | |
199 | } | |
200 | ||
201 | LOC_EXPORT struct loc_as* loc_database_add_as(struct loc_database* db, uint32_t number) { | |
202 | struct loc_as* as; | |
203 | int r = loc_as_new(db->ctx, db->pool, &as, number); | |
204 | if (r) | |
205 | return NULL; | |
206 | ||
207 | return __loc_database_add_as(db, as); | |
208 | } | |
209 | ||
3f35869a | 210 | static int loc_database_read_magic(struct loc_database* db) { |
2601e83e MT |
211 | struct loc_database_magic magic; |
212 | ||
213 | // Read from file | |
3f35869a | 214 | size_t bytes_read = fread(&magic, 1, sizeof(magic), db->file); |
2601e83e MT |
215 | |
216 | // Check if we have been able to read enough data | |
217 | if (bytes_read < sizeof(magic)) { | |
218 | ERROR(db->ctx, "Could not read enough data to validate magic bytes\n"); | |
219 | DEBUG(db->ctx, "Read %zu bytes, but needed %zu\n", bytes_read, sizeof(magic)); | |
220 | return -ENOMSG; | |
221 | } | |
222 | ||
223 | // Compare magic bytes | |
224 | if (memcmp(LOC_DATABASE_MAGIC, magic.magic, strlen(LOC_DATABASE_MAGIC)) == 0) { | |
225 | DEBUG(db->ctx, "Magic value matches\n"); | |
226 | ||
227 | // Parse version | |
228 | db->version = ntohs(magic.version); | |
229 | DEBUG(db->ctx, "Database version is %u\n", db->version); | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | ERROR(db->ctx, "Database format is not compatible\n"); | |
235 | ||
236 | // Return an error | |
237 | return 1; | |
238 | } | |
239 | ||
a5db3e49 | 240 | static int loc_database_read_as_section_v0(struct loc_database* db, |
3f35869a | 241 | off_t as_offset, size_t as_length) { |
a5db3e49 MT |
242 | struct loc_database_as_v0 dbobj; |
243 | ||
244 | // Read from the start of the section | |
3f35869a | 245 | int r = fseek(db->file, as_offset, SEEK_SET); |
a5db3e49 MT |
246 | if (r) |
247 | return r; | |
248 | ||
249 | // Read all ASes | |
250 | size_t as_count = as_length / sizeof(dbobj); | |
251 | for (unsigned int i = 0; i < as_count; i++) { | |
3f35869a | 252 | size_t bytes_read = fread(&dbobj, 1, sizeof(dbobj), db->file); |
a5db3e49 MT |
253 | if (bytes_read < sizeof(dbobj)) { |
254 | ERROR(db->ctx, "Could not read an AS object\n"); | |
255 | return -ENOMSG; | |
256 | } | |
257 | ||
258 | // Allocate a new AS | |
259 | struct loc_as* as; | |
260 | r = loc_as_new_from_database_v0(db->ctx, db->pool, &as, &dbobj); | |
261 | if (r) | |
262 | return r; | |
263 | ||
264 | // Attach it to the database | |
265 | as = __loc_database_add_as(db, as); | |
266 | loc_as_unref(as); | |
267 | } | |
268 | ||
269 | INFO(db->ctx, "Read %zu ASes from the database\n", db->as_count); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
3f35869a | 274 | static int loc_database_read_header_v0(struct loc_database* db) { |
2601e83e MT |
275 | struct loc_database_header_v0 header; |
276 | ||
277 | // Read from file | |
3f35869a | 278 | size_t size = fread(&header, 1, sizeof(header), db->file); |
2601e83e MT |
279 | |
280 | if (size < sizeof(header)) { | |
281 | ERROR(db->ctx, "Could not read enough data for header\n"); | |
282 | return -ENOMSG; | |
283 | } | |
284 | ||
285 | // Copy over data | |
96ea74a5 | 286 | db->created_at = be64toh(header.created_at); |
2601e83e MT |
287 | db->vendor = ntohl(header.vendor); |
288 | db->description = ntohl(header.description); | |
289 | ||
290 | // Open pool | |
291 | off_t pool_offset = ntohl(header.pool_offset); | |
292 | size_t pool_length = ntohl(header.pool_length); | |
293 | ||
3f35869a | 294 | int r = loc_stringpool_read(db->pool, db->file, pool_offset, pool_length); |
2601e83e MT |
295 | if (r) |
296 | return r; | |
297 | ||
a5db3e49 MT |
298 | // AS section |
299 | off_t as_offset = ntohl(header.as_offset); | |
300 | size_t as_length = ntohl(header.as_length); | |
301 | ||
3f35869a | 302 | r = loc_database_read_as_section_v0(db, as_offset, as_length); |
a5db3e49 MT |
303 | if (r) |
304 | return r; | |
305 | ||
2601e83e MT |
306 | return 0; |
307 | } | |
308 | ||
3f35869a | 309 | static int loc_database_read_header(struct loc_database* db) { |
2601e83e MT |
310 | switch (db->version) { |
311 | case 0: | |
3f35869a | 312 | return loc_database_read_header_v0(db); |
2601e83e MT |
313 | |
314 | default: | |
315 | ERROR(db->ctx, "Incompatible database version: %u\n", db->version); | |
316 | return 1; | |
317 | } | |
318 | } | |
319 | ||
320 | LOC_EXPORT int loc_database_read(struct loc_database* db, FILE* f) { | |
3f35869a MT |
321 | // Copy the file pointer and work on that so we don't care if |
322 | // the calling function closes the file | |
323 | int fd = fileno(f); | |
324 | ||
325 | // Make a copy | |
326 | fd = dup(fd); | |
327 | ||
328 | // Retrieve a file pointer | |
329 | db->file = fdopen(fd, "r"); | |
330 | if (!db->file) | |
331 | return -errno; | |
332 | ||
333 | int r = fseek(db->file, 0, SEEK_SET); | |
2601e83e MT |
334 | if (r) |
335 | return r; | |
336 | ||
337 | // Read magic bytes | |
3f35869a | 338 | r = loc_database_read_magic(db); |
2601e83e MT |
339 | if (r) |
340 | return r; | |
341 | ||
342 | // Read the header | |
3f35869a | 343 | r = loc_database_read_header(db); |
2601e83e MT |
344 | if (r) |
345 | return r; | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static void loc_database_make_magic(struct loc_database* db, struct loc_database_magic* magic) { | |
351 | // Copy magic bytes | |
352 | for (unsigned int i = 0; i < strlen(LOC_DATABASE_MAGIC); i++) | |
353 | magic->magic[i] = LOC_DATABASE_MAGIC[i]; | |
354 | ||
355 | // Set version | |
356 | magic->version = htons(LOC_DATABASE_VERSION); | |
357 | } | |
358 | ||
8f5b676a MT |
359 | static void loc_database_align_page_boundary(off_t* offset, FILE* f) { |
360 | // Move to next page boundary | |
361 | while (*offset % LOC_DATABASE_PAGE_SIZE > 0) | |
362 | *offset += fwrite("", 1, 1, f); | |
363 | } | |
364 | ||
c34e76f1 MT |
365 | static int loc_database_write_pool(struct loc_database* db, struct loc_database_header_v0* header, off_t* offset, FILE* f) { |
366 | // Save the offset of the pool section | |
367 | DEBUG(db->ctx, "Pool starts at %jd bytes\n", *offset); | |
368 | header->pool_offset = htonl(*offset); | |
369 | ||
370 | // Write the pool | |
371 | size_t pool_length = loc_stringpool_write(db->pool, f); | |
372 | *offset += pool_length; | |
373 | ||
374 | DEBUG(db->ctx, "Pool has a length of %zu bytes\n", pool_length); | |
375 | header->pool_length = htonl(pool_length); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
78ace4ed MT |
380 | static int loc_database_write_as_section(struct loc_database* db, |
381 | struct loc_database_header_v0* header, off_t* offset, FILE* f) { | |
382 | DEBUG(db->ctx, "AS section starts at %jd bytes\n", *offset); | |
383 | header->as_offset = htonl(*offset); | |
384 | ||
385 | size_t as_length = 0; | |
386 | ||
387 | struct loc_database_as_v0 dbas; | |
388 | for (unsigned int i = 0; i < db->as_count; i++) { | |
389 | // Convert AS into database format | |
390 | loc_as_to_database_v0(db->as[i], &dbas); | |
391 | ||
392 | // Write to disk | |
393 | offset += fwrite(&dbas, 1, sizeof(dbas), f); | |
394 | as_length += sizeof(dbas); | |
395 | } | |
396 | ||
397 | DEBUG(db->ctx, "AS section has a length of %zu bytes\n", as_length); | |
398 | header->as_length = htonl(as_length); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
2601e83e MT |
403 | LOC_EXPORT int loc_database_write(struct loc_database* db, FILE* f) { |
404 | struct loc_database_magic magic; | |
405 | loc_database_make_magic(db, &magic); | |
406 | ||
407 | // Make the header | |
408 | struct loc_database_header_v0 header; | |
96ea74a5 | 409 | header.created_at = htobe64(db->created_at); |
2601e83e MT |
410 | header.vendor = htonl(db->vendor); |
411 | header.description = htonl(db->description); | |
412 | ||
413 | int r; | |
414 | off_t offset = 0; | |
415 | ||
416 | // Start writing at the beginning of the file | |
417 | r = fseek(f, 0, SEEK_SET); | |
418 | if (r) | |
419 | return r; | |
420 | ||
421 | // Write the magic | |
422 | offset += fwrite(&magic, 1, sizeof(magic), f); | |
423 | ||
424 | // Skip the space we need to write the header later | |
425 | r = fseek(f, sizeof(header), SEEK_CUR); | |
426 | if (r) { | |
427 | DEBUG(db->ctx, "Could not seek to position after header\n"); | |
428 | return r; | |
429 | } | |
430 | offset += sizeof(header); | |
431 | ||
8f5b676a | 432 | loc_database_align_page_boundary(&offset, f); |
c34e76f1 MT |
433 | |
434 | // Write pool | |
435 | r = loc_database_write_pool(db, &header, &offset, f); | |
436 | if (r) | |
437 | return r; | |
438 | ||
8f5b676a MT |
439 | loc_database_align_page_boundary(&offset, f); |
440 | ||
a5db3e49 | 441 | // Write all ASes |
78ace4ed MT |
442 | r = loc_database_write_as_section(db, &header, &offset, f); |
443 | if (r) | |
444 | return r; | |
a5db3e49 | 445 | |
2601e83e MT |
446 | // Write the header |
447 | r = fseek(f, sizeof(magic), SEEK_SET); | |
448 | if (r) | |
449 | return r; | |
450 | ||
451 | offset += fwrite(&header, 1, sizeof(header), f); | |
452 | ||
453 | return 0; | |
454 | } |