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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> | |
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 | ||
3f35869a | 41 | FILE* file; |
2601e83e | 42 | unsigned int version; |
96ea74a5 | 43 | time_t created_at; |
2601e83e MT |
44 | off_t vendor; |
45 | off_t description; | |
46 | ||
a5db3e49 | 47 | // ASes in the database |
c182393f | 48 | struct loc_database_as_v0* as_v0; |
a5db3e49 MT |
49 | size_t as_count; |
50 | ||
2601e83e MT |
51 | struct loc_stringpool* pool; |
52 | }; | |
53 | ||
3f35869a | 54 | static int loc_database_read_magic(struct loc_database* db) { |
2601e83e MT |
55 | struct loc_database_magic magic; |
56 | ||
57 | // Read from file | |
3f35869a | 58 | size_t bytes_read = fread(&magic, 1, sizeof(magic), db->file); |
2601e83e MT |
59 | |
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)); | |
64 | return -ENOMSG; | |
65 | } | |
66 | ||
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"); | |
70 | ||
71 | // Parse version | |
72 | db->version = ntohs(magic.version); | |
73 | DEBUG(db->ctx, "Database version is %u\n", db->version); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | ERROR(db->ctx, "Database format is not compatible\n"); | |
79 | ||
80 | // Return an error | |
81 | return 1; | |
82 | } | |
83 | ||
a5db3e49 | 84 | static int loc_database_read_as_section_v0(struct loc_database* db, |
3f35869a | 85 | off_t as_offset, size_t as_length) { |
c182393f | 86 | DEBUG(db->ctx, "Reading AS section from %jd (%zu bytes)\n", as_offset, as_length); |
a5db3e49 | 87 | |
c182393f MT |
88 | if (as_length > 0) { |
89 | db->as_v0 = mmap(NULL, as_length, PROT_READ, | |
90 | MAP_SHARED, fileno(db->file), as_offset); | |
a5db3e49 | 91 | |
c182393f MT |
92 | if (db->as_v0 == MAP_FAILED) |
93 | return -errno; | |
a5db3e49 MT |
94 | } |
95 | ||
c182393f MT |
96 | db->as_count = as_length / sizeof(*db->as_v0); |
97 | ||
a5db3e49 MT |
98 | INFO(db->ctx, "Read %zu ASes from the database\n", db->as_count); |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
3f35869a | 103 | static int loc_database_read_header_v0(struct loc_database* db) { |
2601e83e MT |
104 | struct loc_database_header_v0 header; |
105 | ||
106 | // Read from file | |
3f35869a | 107 | size_t size = fread(&header, 1, sizeof(header), db->file); |
2601e83e MT |
108 | |
109 | if (size < sizeof(header)) { | |
110 | ERROR(db->ctx, "Could not read enough data for header\n"); | |
111 | return -ENOMSG; | |
112 | } | |
113 | ||
114 | // Copy over data | |
96ea74a5 | 115 | db->created_at = be64toh(header.created_at); |
2601e83e MT |
116 | db->vendor = ntohl(header.vendor); |
117 | db->description = ntohl(header.description); | |
118 | ||
119 | // Open pool | |
120 | off_t pool_offset = ntohl(header.pool_offset); | |
121 | size_t pool_length = ntohl(header.pool_length); | |
122 | ||
c182393f MT |
123 | int r = loc_stringpool_new(db->ctx, &db->pool, 0); |
124 | if (r) | |
125 | return r; | |
126 | ||
127 | r = loc_stringpool_read(db->pool, db->file, pool_offset, pool_length); | |
2601e83e MT |
128 | if (r) |
129 | return r; | |
130 | ||
a5db3e49 MT |
131 | // AS section |
132 | off_t as_offset = ntohl(header.as_offset); | |
133 | size_t as_length = ntohl(header.as_length); | |
134 | ||
3f35869a | 135 | r = loc_database_read_as_section_v0(db, as_offset, as_length); |
a5db3e49 MT |
136 | if (r) |
137 | return r; | |
138 | ||
2601e83e MT |
139 | return 0; |
140 | } | |
141 | ||
3f35869a | 142 | static int loc_database_read_header(struct loc_database* db) { |
2601e83e MT |
143 | switch (db->version) { |
144 | case 0: | |
3f35869a | 145 | return loc_database_read_header_v0(db); |
2601e83e MT |
146 | |
147 | default: | |
148 | ERROR(db->ctx, "Incompatible database version: %u\n", db->version); | |
149 | return 1; | |
150 | } | |
151 | } | |
152 | ||
c182393f | 153 | static FILE* copy_file_pointer(FILE* f) { |
3f35869a MT |
154 | int fd = fileno(f); |
155 | ||
156 | // Make a copy | |
157 | fd = dup(fd); | |
158 | ||
c182393f MT |
159 | return fdopen(fd, "r"); |
160 | } | |
3f35869a | 161 | |
c182393f MT |
162 | LOC_EXPORT int loc_database_new(struct loc_ctx* ctx, struct loc_database** database, FILE* f) { |
163 | struct loc_database* db = calloc(1, sizeof(*db)); | |
164 | if (!db) | |
165 | return -ENOMEM; | |
166 | ||
167 | // Reference context | |
168 | db->ctx = loc_ref(ctx); | |
169 | db->refcount = 1; | |
170 | ||
171 | DEBUG(db->ctx, "Database object allocated at %p\n", db); | |
172 | ||
173 | // Copy the file pointer and work on that so we don't care if | |
174 | // the calling function closes the file | |
175 | db->file = copy_file_pointer(f); | |
176 | if (!db->file) | |
177 | goto FAIL; | |
2601e83e MT |
178 | |
179 | // Read magic bytes | |
c182393f | 180 | int r = loc_database_read_magic(db); |
2601e83e MT |
181 | if (r) |
182 | return r; | |
183 | ||
184 | // Read the header | |
3f35869a | 185 | r = loc_database_read_header(db); |
2601e83e MT |
186 | if (r) |
187 | return r; | |
188 | ||
c182393f MT |
189 | *database = db; |
190 | ||
2601e83e | 191 | return 0; |
2601e83e | 192 | |
c182393f MT |
193 | FAIL: |
194 | loc_database_unref(db); | |
2601e83e | 195 | |
c182393f | 196 | return -errno; |
2601e83e MT |
197 | } |
198 | ||
c182393f MT |
199 | LOC_EXPORT struct loc_database* loc_database_ref(struct loc_database* db) { |
200 | db->refcount++; | |
201 | ||
202 | return db; | |
8f5b676a MT |
203 | } |
204 | ||
c182393f MT |
205 | static void loc_database_free(struct loc_database* db) { |
206 | DEBUG(db->ctx, "Releasing database %p\n", db); | |
c34e76f1 | 207 | |
c182393f MT |
208 | // Removing all ASes |
209 | if (db->as_v0) { | |
210 | int r = munmap(db->as_v0, db->as_count * sizeof(*db->as_v0)); | |
211 | if (r) | |
212 | ERROR(db->ctx, "Could not unmap AS section: %s\n", strerror(errno)); | |
213 | } | |
c34e76f1 | 214 | |
c182393f | 215 | loc_stringpool_unref(db->pool); |
c34e76f1 | 216 | |
c182393f MT |
217 | // Close file |
218 | if (db->file) | |
219 | fclose(db->file); | |
220 | ||
221 | loc_unref(db->ctx); | |
222 | free(db); | |
c34e76f1 MT |
223 | } |
224 | ||
c182393f MT |
225 | LOC_EXPORT struct loc_database* loc_database_unref(struct loc_database* db) { |
226 | if (--db->refcount > 0) | |
227 | return NULL; | |
78ace4ed | 228 | |
c182393f MT |
229 | loc_database_free(db); |
230 | return NULL; | |
231 | } | |
78ace4ed | 232 | |
c182393f MT |
233 | LOC_EXPORT time_t loc_database_created_at(struct loc_database* db) { |
234 | return db->created_at; | |
235 | } | |
78ace4ed | 236 | |
c182393f MT |
237 | LOC_EXPORT const char* loc_database_get_vendor(struct loc_database* db) { |
238 | return loc_stringpool_get(db->pool, db->vendor); | |
239 | } | |
78ace4ed | 240 | |
c182393f MT |
241 | LOC_EXPORT const char* loc_database_get_description(struct loc_database* db) { |
242 | return loc_stringpool_get(db->pool, db->description); | |
243 | } | |
78ace4ed | 244 | |
c182393f MT |
245 | LOC_EXPORT size_t loc_database_count_as(struct loc_database* db) { |
246 | return db->as_count; | |
78ace4ed MT |
247 | } |
248 | ||
c182393f MT |
249 | // Returns the AS at position pos |
250 | static int loc_database_fetch_as(struct loc_database* db, struct loc_as** as, off_t pos) { | |
251 | if ((size_t)pos >= db->as_count) | |
252 | return -EINVAL; | |
2601e83e | 253 | |
c182393f | 254 | DEBUG(db->ctx, "Fetching AS at position %jd\n", pos); |
2601e83e MT |
255 | |
256 | int r; | |
c182393f MT |
257 | switch (db->version) { |
258 | case 0: | |
259 | r = loc_as_new_from_database_v0(db->ctx, db->pool, as, db->as_v0 + pos); | |
260 | break; | |
2601e83e | 261 | |
c182393f MT |
262 | default: |
263 | return -1; | |
264 | } | |
2601e83e | 265 | |
c182393f MT |
266 | if (r == 0) { |
267 | DEBUG(db->ctx, "Got AS%u\n", loc_as_get_number(*as)); | |
2601e83e | 268 | } |
2601e83e | 269 | |
c182393f MT |
270 | return r; |
271 | } | |
c34e76f1 | 272 | |
c182393f MT |
273 | // Performs a binary search to find the AS in the list |
274 | LOC_EXPORT int loc_database_get_as(struct loc_database* db, struct loc_as** as, uint32_t number) { | |
275 | off_t lo = 0; | |
276 | off_t hi = db->as_count - 1; | |
c34e76f1 | 277 | |
c182393f MT |
278 | while (lo <= hi) { |
279 | off_t i = (lo + hi) / 2; | |
8f5b676a | 280 | |
c182393f MT |
281 | // Fetch AS in the middle between lo and hi |
282 | int r = loc_database_fetch_as(db, as, i); | |
283 | if (r) | |
284 | return r; | |
a5db3e49 | 285 | |
c182393f MT |
286 | // Check if this is a match |
287 | uint32_t as_number = loc_as_get_number(*as); | |
288 | if (as_number == number) | |
289 | return 0; | |
290 | ||
291 | // If it wasn't, we release the AS and | |
292 | // adjust our search pointers | |
293 | loc_as_unref(*as); | |
294 | ||
295 | if (as_number < number) { | |
296 | lo = i + 1; | |
297 | } else | |
298 | hi = i - 1; | |
299 | } | |
2601e83e | 300 | |
c182393f MT |
301 | // Nothing found |
302 | *as = NULL; | |
2601e83e MT |
303 | |
304 | return 0; | |
305 | } |