diff options
Diffstat (limited to 'src/nt/nt.c')
-rw-r--r-- | src/nt/nt.c | 445 |
1 files changed, 0 insertions, 445 deletions
diff --git a/src/nt/nt.c b/src/nt/nt.c deleted file mode 100644 index 98653f641..000000000 --- a/src/nt/nt.c +++ /dev/null | |||
@@ -1,445 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2010-2015, 2018 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | /** | ||
21 | * @file nt/nt_api_scanner.c | ||
22 | * @brief LAN interface scanning to determine IPs in LAN | ||
23 | * @author Christian Grothoff | ||
24 | * @author Matthias Wachs | ||
25 | */ | ||
26 | #include "platform.h" | ||
27 | #include "gnunet_util_lib.h" | ||
28 | #include "gnunet_nt_lib.h" | ||
29 | |||
30 | /** | ||
31 | * How frequently do we scan the interfaces for changes to the addresses? | ||
32 | */ | ||
33 | #define INTERFACE_PROCESSING_INTERVAL GNUNET_TIME_relative_multiply ( \ | ||
34 | GNUNET_TIME_UNIT_MINUTES, 2) | ||
35 | |||
36 | |||
37 | /** | ||
38 | * Convert a `enum GNUNET_NetworkType` to a string | ||
39 | * | ||
40 | * @param net the network type | ||
41 | * @return a string or NULL if invalid | ||
42 | */ | ||
43 | const char * | ||
44 | GNUNET_NT_to_string (enum GNUNET_NetworkType net) | ||
45 | { | ||
46 | switch (net) | ||
47 | { | ||
48 | case GNUNET_NT_UNSPECIFIED: | ||
49 | return "UNSPECIFIED"; | ||
50 | |||
51 | case GNUNET_NT_LOOPBACK: | ||
52 | return "LOOPBACK"; | ||
53 | |||
54 | case GNUNET_NT_LAN: | ||
55 | return "LAN"; | ||
56 | |||
57 | case GNUNET_NT_WAN: | ||
58 | return "WAN"; | ||
59 | |||
60 | case GNUNET_NT_WLAN: | ||
61 | return "WLAN"; | ||
62 | |||
63 | case GNUNET_NT_BT: | ||
64 | return "BLUETOOTH"; | ||
65 | |||
66 | default: | ||
67 | return NULL; | ||
68 | } | ||
69 | } | ||
70 | |||
71 | |||
72 | /** | ||
73 | * We keep a list of our local networks so we can answer | ||
74 | * LAN vs. WAN questions. Note: WLAN is not detected yet. | ||
75 | * (maybe we can do that heuristically based on interface | ||
76 | * name in the future?). | ||
77 | */ | ||
78 | struct NT_Network | ||
79 | { | ||
80 | /** | ||
81 | * Kept in a DLL. | ||
82 | */ | ||
83 | struct NT_Network *next; | ||
84 | |||
85 | /** | ||
86 | * Kept in a DLL. | ||
87 | */ | ||
88 | struct NT_Network *prev; | ||
89 | |||
90 | /** | ||
91 | * Network address. | ||
92 | */ | ||
93 | struct sockaddr *network; | ||
94 | |||
95 | /** | ||
96 | * Netmask to determine what is in the LAN. | ||
97 | */ | ||
98 | struct sockaddr *netmask; | ||
99 | |||
100 | /** | ||
101 | * How long are @e network and @e netmask? | ||
102 | */ | ||
103 | socklen_t length; | ||
104 | }; | ||
105 | |||
106 | |||
107 | /** | ||
108 | * Handle to the interface scanner. | ||
109 | */ | ||
110 | struct GNUNET_NT_InterfaceScanner | ||
111 | { | ||
112 | /** | ||
113 | * Head of LAN networks list. | ||
114 | */ | ||
115 | struct NT_Network *net_head; | ||
116 | |||
117 | /** | ||
118 | * Tail of LAN networks list. | ||
119 | */ | ||
120 | struct NT_Network *net_tail; | ||
121 | |||
122 | /** | ||
123 | * Task for periodically refreshing our LAN network list. | ||
124 | */ | ||
125 | struct GNUNET_SCHEDULER_Task *interface_task; | ||
126 | }; | ||
127 | |||
128 | |||
129 | /** | ||
130 | * Delete all entries from the current network list. | ||
131 | * | ||
132 | * @param is scanner to clean up | ||
133 | */ | ||
134 | static void | ||
135 | delete_networks (struct GNUNET_NT_InterfaceScanner *is) | ||
136 | { | ||
137 | struct NT_Network *cur; | ||
138 | |||
139 | while (NULL != (cur = is->net_head)) | ||
140 | { | ||
141 | GNUNET_CONTAINER_DLL_remove (is->net_head, | ||
142 | is->net_tail, | ||
143 | cur); | ||
144 | GNUNET_free (cur); | ||
145 | } | ||
146 | } | ||
147 | |||
148 | |||
149 | /** | ||
150 | * Function invoked for each interface found. Adds the interface's | ||
151 | * network addresses to the respective DLL, so we can distinguish | ||
152 | * between LAN and WAN. | ||
153 | * | ||
154 | * @param cls closure with the `struct GNUNET_NT_InterfaceScanner` | ||
155 | * @param name name of the interface (can be NULL for unknown) | ||
156 | * @param isDefault is this presumably the default interface | ||
157 | * @param addr address of this interface (can be NULL for unknown or unassigned) | ||
158 | * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned) | ||
159 | * @param netmask the network mask (can be NULL for unknown or unassigned) | ||
160 | * @param addrlen length of the address | ||
161 | * @return #GNUNET_OK to continue iteration | ||
162 | */ | ||
163 | static int | ||
164 | interface_proc (void *cls, | ||
165 | const char *name, | ||
166 | int isDefault, | ||
167 | const struct sockaddr *addr, | ||
168 | const struct sockaddr *broadcast_addr, | ||
169 | const struct sockaddr *netmask, | ||
170 | socklen_t addrlen) | ||
171 | { | ||
172 | struct GNUNET_NT_InterfaceScanner *is = cls; | ||
173 | /* Calculate network */ | ||
174 | struct NT_Network *net = NULL; | ||
175 | |||
176 | (void) name; | ||
177 | (void) isDefault; | ||
178 | (void) broadcast_addr; | ||
179 | |||
180 | /* Skipping IPv4 loopback addresses since we have special check */ | ||
181 | if (addr->sa_family == AF_INET) | ||
182 | { | ||
183 | const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr; | ||
184 | |||
185 | if ((a4->sin_addr.s_addr & htonl (0xff000000)) == htonl (0x7f000000)) | ||
186 | return GNUNET_OK; | ||
187 | } | ||
188 | /* Skipping IPv6 loopback addresses since we have special check */ | ||
189 | if (addr->sa_family == AF_INET6) | ||
190 | { | ||
191 | const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr; | ||
192 | if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr)) | ||
193 | return GNUNET_OK; | ||
194 | } | ||
195 | |||
196 | if (addr->sa_family == AF_INET) | ||
197 | { | ||
198 | const struct sockaddr_in *addr4 = (const struct sockaddr_in *) addr; | ||
199 | const struct sockaddr_in *netmask4 = (const struct sockaddr_in *) netmask; | ||
200 | struct sockaddr_in *tmp; | ||
201 | struct sockaddr_in network4; | ||
202 | |||
203 | net = GNUNET_malloc (sizeof(struct NT_Network) + 2 * sizeof(struct | ||
204 | sockaddr_in)); | ||
205 | tmp = (struct sockaddr_in *) &net[1]; | ||
206 | net->network = (struct sockaddr *) &tmp[0]; | ||
207 | net->netmask = (struct sockaddr *) &tmp[1]; | ||
208 | net->length = addrlen; | ||
209 | |||
210 | memset (&network4, | ||
211 | 0, | ||
212 | sizeof(network4)); | ||
213 | network4.sin_family = AF_INET; | ||
214 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
215 | network4.sin_len = sizeof(network4); | ||
216 | #endif | ||
217 | network4.sin_addr.s_addr = (addr4->sin_addr.s_addr | ||
218 | & netmask4->sin_addr.s_addr); | ||
219 | |||
220 | GNUNET_memcpy (net->netmask, | ||
221 | netmask4, | ||
222 | sizeof(struct sockaddr_in)); | ||
223 | GNUNET_memcpy (net->network, | ||
224 | &network4, | ||
225 | sizeof(struct sockaddr_in)); | ||
226 | } | ||
227 | |||
228 | if (addr->sa_family == AF_INET6) | ||
229 | { | ||
230 | const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr; | ||
231 | const struct sockaddr_in6 *netmask6 = (const struct sockaddr_in6 *) netmask; | ||
232 | struct sockaddr_in6 *tmp; | ||
233 | struct sockaddr_in6 network6; | ||
234 | |||
235 | net = GNUNET_malloc (sizeof(struct NT_Network) + 2 * sizeof(struct | ||
236 | sockaddr_in6)); | ||
237 | tmp = (struct sockaddr_in6 *) &net[1]; | ||
238 | net->network = (struct sockaddr *) &tmp[0]; | ||
239 | net->netmask = (struct sockaddr *) &tmp[1]; | ||
240 | net->length = addrlen; | ||
241 | |||
242 | memset (&network6, 0, sizeof(network6)); | ||
243 | network6.sin6_family = AF_INET6; | ||
244 | #if HAVE_SOCKADDR_IN_SIN_LEN | ||
245 | network6.sin6_len = sizeof(network6); | ||
246 | #endif | ||
247 | unsigned int c = 0; | ||
248 | uint32_t *addr_elem = (uint32_t *) &addr6->sin6_addr; | ||
249 | uint32_t *mask_elem = (uint32_t *) &netmask6->sin6_addr; | ||
250 | uint32_t *net_elem = (uint32_t *) &network6.sin6_addr; | ||
251 | for (c = 0; c < 4; c++) | ||
252 | net_elem[c] = addr_elem[c] & mask_elem[c]; | ||
253 | |||
254 | GNUNET_memcpy (net->netmask, | ||
255 | netmask6, | ||
256 | sizeof(struct sockaddr_in6)); | ||
257 | GNUNET_memcpy (net->network, | ||
258 | &network6, | ||
259 | sizeof(struct sockaddr_in6)); | ||
260 | } | ||
261 | if (NULL == net) | ||
262 | return GNUNET_OK; /* odd / unsupported address family */ | ||
263 | |||
264 | /* Store in list */ | ||
265 | #if VERBOSE_NT | ||
266 | char *netmask = GNUNET_strdup (GNUNET_a2s ((struct sockaddr *) net->netmask, | ||
267 | addrlen)); | ||
268 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
269 | "nt", | ||
270 | "Adding network `%s', netmask `%s'\n", | ||
271 | GNUNET_a2s ((struct sockaddr *) net->network, | ||
272 | addrlen), | ||
273 | netmask); | ||
274 | GNUNET_free (netmask); | ||
275 | #endif | ||
276 | GNUNET_CONTAINER_DLL_insert (is->net_head, | ||
277 | is->net_tail, | ||
278 | net); | ||
279 | |||
280 | return GNUNET_OK; | ||
281 | } | ||
282 | |||
283 | |||
284 | /** | ||
285 | * Periodically get list of network addresses from our interfaces. | ||
286 | * | ||
287 | * @param cls closure | ||
288 | */ | ||
289 | static void | ||
290 | get_addresses (void *cls) | ||
291 | { | ||
292 | struct GNUNET_NT_InterfaceScanner *is = cls; | ||
293 | |||
294 | is->interface_task = NULL; | ||
295 | delete_networks (is); | ||
296 | GNUNET_OS_network_interfaces_list (&interface_proc, | ||
297 | is); | ||
298 | is->interface_task = GNUNET_SCHEDULER_add_delayed ( | ||
299 | INTERFACE_PROCESSING_INTERVAL, | ||
300 | &get_addresses, | ||
301 | is); | ||
302 | } | ||
303 | |||
304 | |||
305 | /** | ||
306 | * Returns where the address is located: LAN or WAN or ... | ||
307 | * | ||
308 | * @param is the interface scanner handle | ||
309 | * @param addr address | ||
310 | * @param addrlen address length | ||
311 | * @return type of the network the address belongs to | ||
312 | */ | ||
313 | enum GNUNET_NetworkType | ||
314 | GNUNET_NT_scanner_get_type (struct GNUNET_NT_InterfaceScanner *is, | ||
315 | const struct sockaddr *addr, | ||
316 | socklen_t addrlen) | ||
317 | { | ||
318 | struct NT_Network *cur = is->net_head; | ||
319 | enum GNUNET_NetworkType type = GNUNET_NT_UNSPECIFIED; | ||
320 | |||
321 | switch (addr->sa_family) | ||
322 | { | ||
323 | case AF_UNIX: | ||
324 | type = GNUNET_NT_LOOPBACK; | ||
325 | break; | ||
326 | |||
327 | case AF_INET: | ||
328 | { | ||
329 | const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr; | ||
330 | |||
331 | if ((a4->sin_addr.s_addr & htonl (0xff000000)) == htonl (0x7f000000)) | ||
332 | type = GNUNET_NT_LOOPBACK; | ||
333 | break; | ||
334 | } | ||
335 | |||
336 | case AF_INET6: | ||
337 | { | ||
338 | const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr; | ||
339 | |||
340 | if (IN6_IS_ADDR_LOOPBACK (&a6->sin6_addr)) | ||
341 | type = GNUNET_NT_LOOPBACK; | ||
342 | break; | ||
343 | } | ||
344 | |||
345 | default: | ||
346 | GNUNET_break (0); | ||
347 | break; | ||
348 | } | ||
349 | |||
350 | /* Check local networks */ | ||
351 | while ((NULL != cur) && (GNUNET_NT_UNSPECIFIED == type)) | ||
352 | { | ||
353 | if (addrlen != cur->length) | ||
354 | { | ||
355 | cur = cur->next; | ||
356 | continue; | ||
357 | } | ||
358 | if (addr->sa_family == AF_INET) | ||
359 | { | ||
360 | const struct sockaddr_in *a4 = (const struct sockaddr_in *) addr; | ||
361 | const struct sockaddr_in *net4 = (const struct | ||
362 | sockaddr_in *) cur->network; | ||
363 | const struct sockaddr_in *mask4 = (const struct | ||
364 | sockaddr_in *) cur->netmask; | ||
365 | |||
366 | if (((a4->sin_addr.s_addr & mask4->sin_addr.s_addr)) == | ||
367 | net4->sin_addr.s_addr) | ||
368 | type = GNUNET_NT_LAN; | ||
369 | } | ||
370 | if (addr->sa_family == AF_INET6) | ||
371 | { | ||
372 | const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) addr; | ||
373 | const struct sockaddr_in6 *net6 = (const struct | ||
374 | sockaddr_in6 *) cur->network; | ||
375 | const struct sockaddr_in6 *mask6 = (const struct | ||
376 | sockaddr_in6 *) cur->netmask; | ||
377 | |||
378 | int res = GNUNET_YES; | ||
379 | int c = 0; | ||
380 | uint32_t *addr_elem = (uint32_t *) &a6->sin6_addr; | ||
381 | uint32_t *mask_elem = (uint32_t *) &mask6->sin6_addr; | ||
382 | uint32_t *net_elem = (uint32_t *) &net6->sin6_addr; | ||
383 | for (c = 0; c < 4; c++) | ||
384 | if ((addr_elem[c] & mask_elem[c]) != net_elem[c]) | ||
385 | res = GNUNET_NO; | ||
386 | |||
387 | if (res == GNUNET_YES) | ||
388 | type = GNUNET_NT_LAN; | ||
389 | } | ||
390 | cur = cur->next; | ||
391 | } | ||
392 | |||
393 | /* no local network found for this address, default: WAN */ | ||
394 | if (type == GNUNET_NT_UNSPECIFIED) | ||
395 | type = GNUNET_NT_WAN; | ||
396 | GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, | ||
397 | "nt-scanner-api", | ||
398 | "`%s' is in network `%s'\n", | ||
399 | GNUNET_a2s (addr, | ||
400 | addrlen), | ||
401 | GNUNET_NT_to_string (type)); | ||
402 | return type; | ||
403 | } | ||
404 | |||
405 | |||
406 | /** | ||
407 | * Initialize the interface scanner. | ||
408 | * | ||
409 | * @return interface scanner | ||
410 | */ | ||
411 | struct GNUNET_NT_InterfaceScanner * | ||
412 | GNUNET_NT_scanner_init () | ||
413 | { | ||
414 | struct GNUNET_NT_InterfaceScanner *is; | ||
415 | |||
416 | is = GNUNET_new (struct GNUNET_NT_InterfaceScanner); | ||
417 | GNUNET_OS_network_interfaces_list (&interface_proc, | ||
418 | is); | ||
419 | is->interface_task = GNUNET_SCHEDULER_add_delayed ( | ||
420 | INTERFACE_PROCESSING_INTERVAL, | ||
421 | &get_addresses, | ||
422 | is); | ||
423 | return is; | ||
424 | } | ||
425 | |||
426 | |||
427 | /** | ||
428 | * Client is done with the interface scanner, release resources. | ||
429 | * | ||
430 | * @param is handle to release | ||
431 | */ | ||
432 | void | ||
433 | GNUNET_NT_scanner_done (struct GNUNET_NT_InterfaceScanner *is) | ||
434 | { | ||
435 | if (NULL != is->interface_task) | ||
436 | { | ||
437 | GNUNET_SCHEDULER_cancel (is->interface_task); | ||
438 | is->interface_task = NULL; | ||
439 | } | ||
440 | delete_networks (is); | ||
441 | GNUNET_free (is); | ||
442 | } | ||
443 | |||
444 | |||
445 | /* end of nt.c */ | ||