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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 | ||
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> | |
9fc7f001 MT |
30 | #include <loc/as.h> |
31 | #include <loc/database.h> | |
a5db3e49 | 32 | #include <loc/format.h> |
9fc7f001 MT |
33 | #include <loc/private.h> |
34 | #include <loc/stringpool.h> | |
2601e83e MT |
35 | |
36 | struct loc_database { | |
37 | struct loc_ctx* ctx; | |
38 | int refcount; | |
39 | ||
40 | unsigned int version; | |
96ea74a5 | 41 | time_t created_at; |
2601e83e MT |
42 | off_t vendor; |
43 | off_t description; | |
44 | ||
a5db3e49 | 45 | // ASes in the database |
c182393f | 46 | struct loc_database_as_v0* as_v0; |
a5db3e49 MT |
47 | size_t as_count; |
48 | ||
2601e83e MT |
49 | struct loc_stringpool* pool; |
50 | }; | |
51 | ||
a7431f1a | 52 | static int loc_database_read_magic(struct loc_database* db, FILE* f) { |
2601e83e MT |
53 | struct loc_database_magic magic; |
54 | ||
55 | // Read from file | |
a7431f1a | 56 | size_t bytes_read = fread(&magic, 1, sizeof(magic), f); |
2601e83e MT |
57 | |
58 | // Check if we have been able to read enough data | |
59 | if (bytes_read < sizeof(magic)) { | |
60 | ERROR(db->ctx, "Could not read enough data to validate magic bytes\n"); | |
61 | DEBUG(db->ctx, "Read %zu bytes, but needed %zu\n", bytes_read, sizeof(magic)); | |
62 | return -ENOMSG; | |
63 | } | |
64 | ||
65 | // Compare magic bytes | |
66 | if (memcmp(LOC_DATABASE_MAGIC, magic.magic, strlen(LOC_DATABASE_MAGIC)) == 0) { | |
67 | DEBUG(db->ctx, "Magic value matches\n"); | |
68 | ||
69 | // Parse version | |
0676cd80 | 70 | db->version = be16toh(magic.version); |
2601e83e MT |
71 | DEBUG(db->ctx, "Database version is %u\n", db->version); |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | ERROR(db->ctx, "Database format is not compatible\n"); | |
77 | ||
78 | // Return an error | |
79 | return 1; | |
80 | } | |
81 | ||
a5db3e49 | 82 | static int loc_database_read_as_section_v0(struct loc_database* db, |
a7431f1a | 83 | FILE* f, off_t as_offset, size_t as_length) { |
c182393f | 84 | DEBUG(db->ctx, "Reading AS section from %jd (%zu bytes)\n", as_offset, as_length); |
a5db3e49 | 85 | |
c182393f MT |
86 | if (as_length > 0) { |
87 | db->as_v0 = mmap(NULL, as_length, PROT_READ, | |
a7431f1a | 88 | MAP_SHARED, fileno(f), as_offset); |
a5db3e49 | 89 | |
c182393f MT |
90 | if (db->as_v0 == MAP_FAILED) |
91 | return -errno; | |
a5db3e49 MT |
92 | } |
93 | ||
c182393f MT |
94 | db->as_count = as_length / sizeof(*db->as_v0); |
95 | ||
a5db3e49 MT |
96 | INFO(db->ctx, "Read %zu ASes from the database\n", db->as_count); |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
a7431f1a | 101 | static int loc_database_read_header_v0(struct loc_database* db, FILE* f) { |
2601e83e MT |
102 | struct loc_database_header_v0 header; |
103 | ||
104 | // Read from file | |
a7431f1a | 105 | size_t size = fread(&header, 1, sizeof(header), f); |
2601e83e MT |
106 | |
107 | if (size < sizeof(header)) { | |
108 | ERROR(db->ctx, "Could not read enough data for header\n"); | |
109 | return -ENOMSG; | |
110 | } | |
111 | ||
112 | // Copy over data | |
96ea74a5 | 113 | db->created_at = be64toh(header.created_at); |
0676cd80 MT |
114 | db->vendor = be32toh(header.vendor); |
115 | db->description = be32toh(header.description); | |
2601e83e MT |
116 | |
117 | // Open pool | |
0676cd80 MT |
118 | off_t pool_offset = be32toh(header.pool_offset); |
119 | size_t pool_length = be32toh(header.pool_length); | |
2601e83e | 120 | |
0e974d4b | 121 | int r = loc_stringpool_open(db->ctx, &db->pool, |
a7431f1a | 122 | f, pool_length, pool_offset); |
2601e83e MT |
123 | if (r) |
124 | return r; | |
125 | ||
a5db3e49 | 126 | // AS section |
0676cd80 MT |
127 | off_t as_offset = be32toh(header.as_offset); |
128 | size_t as_length = be32toh(header.as_length); | |
a5db3e49 | 129 | |
a7431f1a | 130 | r = loc_database_read_as_section_v0(db, f, as_offset, as_length); |
a5db3e49 MT |
131 | if (r) |
132 | return r; | |
133 | ||
2601e83e MT |
134 | return 0; |
135 | } | |
136 | ||
a7431f1a | 137 | static int loc_database_read_header(struct loc_database* db, FILE* f) { |
2601e83e MT |
138 | switch (db->version) { |
139 | case 0: | |
a7431f1a | 140 | return loc_database_read_header_v0(db, f); |
2601e83e MT |
141 | |
142 | default: | |
143 | ERROR(db->ctx, "Incompatible database version: %u\n", db->version); | |
144 | return 1; | |
145 | } | |
146 | } | |
147 | ||
a7431f1a | 148 | static int loc_database_read(struct loc_database* db, FILE* f) { |
02879100 MT |
149 | clock_t start = clock(); |
150 | ||
151 | // Read magic bytes | |
a7431f1a | 152 | int r = loc_database_read_magic(db, f); |
02879100 MT |
153 | if (r) |
154 | return r; | |
155 | ||
156 | // Read the header | |
a7431f1a | 157 | r = loc_database_read_header(db, f); |
02879100 MT |
158 | if (r) |
159 | return r; | |
160 | ||
161 | clock_t end = clock(); | |
162 | ||
163 | INFO(db->ctx, "Opened database in %.8fs\n", | |
164 | (double)(end - start) / CLOCKS_PER_SEC); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
c182393f | 169 | LOC_EXPORT int loc_database_new(struct loc_ctx* ctx, struct loc_database** database, FILE* f) { |
a7431f1a MT |
170 | // Fail on invalid file handle |
171 | if (!f) | |
172 | return -EINVAL; | |
173 | ||
c182393f MT |
174 | struct loc_database* db = calloc(1, sizeof(*db)); |
175 | if (!db) | |
176 | return -ENOMEM; | |
177 | ||
178 | // Reference context | |
179 | db->ctx = loc_ref(ctx); | |
180 | db->refcount = 1; | |
181 | ||
182 | DEBUG(db->ctx, "Database object allocated at %p\n", db); | |
183 | ||
a7431f1a | 184 | int r = loc_database_read(db, f); |
02879100 MT |
185 | if (r) { |
186 | loc_database_unref(db); | |
2601e83e | 187 | return r; |
02879100 | 188 | } |
2601e83e | 189 | |
c182393f MT |
190 | *database = db; |
191 | ||
2601e83e | 192 | return 0; |
2601e83e MT |
193 | } |
194 | ||
c182393f MT |
195 | LOC_EXPORT struct loc_database* loc_database_ref(struct loc_database* db) { |
196 | db->refcount++; | |
197 | ||
198 | return db; | |
8f5b676a MT |
199 | } |
200 | ||
c182393f MT |
201 | static void loc_database_free(struct loc_database* db) { |
202 | DEBUG(db->ctx, "Releasing database %p\n", db); | |
c34e76f1 | 203 | |
c182393f MT |
204 | // Removing all ASes |
205 | if (db->as_v0) { | |
206 | int r = munmap(db->as_v0, db->as_count * sizeof(*db->as_v0)); | |
207 | if (r) | |
208 | ERROR(db->ctx, "Could not unmap AS section: %s\n", strerror(errno)); | |
209 | } | |
c34e76f1 | 210 | |
c182393f | 211 | loc_stringpool_unref(db->pool); |
c34e76f1 | 212 | |
c182393f MT |
213 | loc_unref(db->ctx); |
214 | free(db); | |
c34e76f1 MT |
215 | } |
216 | ||
c182393f MT |
217 | LOC_EXPORT struct loc_database* loc_database_unref(struct loc_database* db) { |
218 | if (--db->refcount > 0) | |
219 | return NULL; | |
78ace4ed | 220 | |
c182393f MT |
221 | loc_database_free(db); |
222 | return NULL; | |
223 | } | |
78ace4ed | 224 | |
c182393f MT |
225 | LOC_EXPORT time_t loc_database_created_at(struct loc_database* db) { |
226 | return db->created_at; | |
227 | } | |
78ace4ed | 228 | |
c182393f MT |
229 | LOC_EXPORT const char* loc_database_get_vendor(struct loc_database* db) { |
230 | return loc_stringpool_get(db->pool, db->vendor); | |
231 | } | |
78ace4ed | 232 | |
c182393f MT |
233 | LOC_EXPORT const char* loc_database_get_description(struct loc_database* db) { |
234 | return loc_stringpool_get(db->pool, db->description); | |
235 | } | |
78ace4ed | 236 | |
c182393f MT |
237 | LOC_EXPORT size_t loc_database_count_as(struct loc_database* db) { |
238 | return db->as_count; | |
78ace4ed MT |
239 | } |
240 | ||
c182393f MT |
241 | // Returns the AS at position pos |
242 | static int loc_database_fetch_as(struct loc_database* db, struct loc_as** as, off_t pos) { | |
243 | if ((size_t)pos >= db->as_count) | |
244 | return -EINVAL; | |
2601e83e | 245 | |
c182393f | 246 | DEBUG(db->ctx, "Fetching AS at position %jd\n", pos); |
2601e83e MT |
247 | |
248 | int r; | |
c182393f MT |
249 | switch (db->version) { |
250 | case 0: | |
251 | r = loc_as_new_from_database_v0(db->ctx, db->pool, as, db->as_v0 + pos); | |
252 | break; | |
2601e83e | 253 | |
c182393f MT |
254 | default: |
255 | return -1; | |
256 | } | |
2601e83e | 257 | |
c182393f MT |
258 | if (r == 0) { |
259 | DEBUG(db->ctx, "Got AS%u\n", loc_as_get_number(*as)); | |
2601e83e | 260 | } |
2601e83e | 261 | |
c182393f MT |
262 | return r; |
263 | } | |
c34e76f1 | 264 | |
c182393f MT |
265 | // Performs a binary search to find the AS in the list |
266 | LOC_EXPORT int loc_database_get_as(struct loc_database* db, struct loc_as** as, uint32_t number) { | |
267 | off_t lo = 0; | |
268 | off_t hi = db->as_count - 1; | |
c34e76f1 | 269 | |
8f3e2a06 MT |
270 | // Save start time |
271 | clock_t start = clock(); | |
272 | ||
c182393f MT |
273 | while (lo <= hi) { |
274 | off_t i = (lo + hi) / 2; | |
8f5b676a | 275 | |
c182393f MT |
276 | // Fetch AS in the middle between lo and hi |
277 | int r = loc_database_fetch_as(db, as, i); | |
278 | if (r) | |
279 | return r; | |
a5db3e49 | 280 | |
c182393f MT |
281 | // Check if this is a match |
282 | uint32_t as_number = loc_as_get_number(*as); | |
8f3e2a06 MT |
283 | if (as_number == number) { |
284 | clock_t end = clock(); | |
285 | ||
286 | // Log how fast this has been | |
287 | DEBUG(db->ctx, "Found AS%u in %.8fs\n", as_number, | |
288 | (double)(end - start) / CLOCKS_PER_SEC); | |
289 | ||
c182393f | 290 | return 0; |
8f3e2a06 | 291 | } |
c182393f MT |
292 | |
293 | // If it wasn't, we release the AS and | |
294 | // adjust our search pointers | |
295 | loc_as_unref(*as); | |
296 | ||
297 | if (as_number < number) { | |
298 | lo = i + 1; | |
299 | } else | |
300 | hi = i - 1; | |
301 | } | |
2601e83e | 302 | |
c182393f MT |
303 | // Nothing found |
304 | *as = NULL; | |
2601e83e | 305 | |
8f3e2a06 | 306 | return 1; |
2601e83e | 307 | } |