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diff --git a/src/nt/nt.c b/src/nt/nt.c
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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 */
43const char *
44GNUNET_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 */
78struct 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 */
110struct 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 */
134static void
135delete_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 */
163static int
164interface_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 */
289static void
290get_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 */
313enum GNUNET_NetworkType
314GNUNET_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 */
411struct GNUNET_NT_InterfaceScanner *
412GNUNET_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 */
432void
433GNUNET_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 */