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-rw-r--r--src/dns/gnunet-dns-monitor.c395
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diff --git a/src/dns/gnunet-dns-monitor.c b/src/dns/gnunet-dns-monitor.c
deleted file mode 100644
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--- a/src/dns/gnunet-dns-monitor.c
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@@ -1,395 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2011 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/**
22 * @file src/dns/gnunet-dns-monitor.c
23 * @brief Tool to monitor DNS queries
24 * @author Christian Grothoff
25 */
26
27#include "platform.h"
28#include "gnunet_util_lib.h"
29#include "gnunet_dns_service.h"
30#include "gnunet_dnsparser_lib.h"
31
32/**
33 * Handle to transport service.
34 */
35static struct GNUNET_DNS_Handle *handle;
36
37/**
38 * Option -i.
39 */
40static int inbound_only;
41
42/**
43 * Option -o.
44 */
45static int outbound_only;
46
47/**
48 * Global return value (0 success).
49 */
50static int ret;
51
52/**
53 * Selected level of verbosity.
54 */
55static unsigned int verbosity;
56
57
58/**
59 * Convert numeric DNS record type to a string.
60 *
61 * @param type type to convert
62 * @return type as string, only valid until the next call to this function
63 */
64static const char *
65get_type (uint16_t type)
66{
67 static char buf[6];
68
69 switch (type)
70 {
71 case GNUNET_DNSPARSER_TYPE_A: return "A";
72
73 case GNUNET_DNSPARSER_TYPE_NS: return "NS";
74
75 case GNUNET_DNSPARSER_TYPE_CNAME: return "CNAME";
76
77 case GNUNET_DNSPARSER_TYPE_SOA: return "SOA";
78
79 case GNUNET_DNSPARSER_TYPE_PTR: return "PTR";
80
81 case GNUNET_DNSPARSER_TYPE_MX: return "MX";
82
83 case GNUNET_DNSPARSER_TYPE_TXT: return "TXT";
84
85 case GNUNET_DNSPARSER_TYPE_AAAA: return "AAAA";
86
87 case GNUNET_DNSPARSER_TYPE_SRV: return "SRV";
88 }
89 GNUNET_snprintf (buf, sizeof(buf), "%u", (unsigned int) type);
90 return buf;
91}
92
93
94/**
95 * Convert numeric DNS record class to a string.
96 *
97 * @param class class to convert
98 * @return class as string, only valid until the next call to this function
99 */
100static const char *
101get_class (uint16_t class)
102{
103 static char buf[6];
104
105 switch (class)
106 {
107 case GNUNET_TUN_DNS_CLASS_INTERNET: return "IN";
108
109 case GNUNET_TUN_DNS_CLASS_CHAOS: return "CHAOS";
110
111 case GNUNET_TUN_DNS_CLASS_HESIOD: return "HESIOD";
112 }
113 GNUNET_snprintf (buf, sizeof(buf), "%u", (unsigned int) class);
114 return buf;
115}
116
117
118/**
119 * Output the given DNS query to stdout.
120 *
121 * @param query query to display.
122 */
123static void
124display_query (const struct GNUNET_DNSPARSER_Query *query)
125{
126 fprintf (stdout,
127 "\t\t%s %s: %s\n",
128 get_class (query->dns_traffic_class),
129 get_type (query->type),
130 query->name);
131}
132
133
134/**
135 * Output the given DNS record to stdout.
136 *
137 * @param record record to display.
138 */
139static void
140display_record (const struct GNUNET_DNSPARSER_Record *record)
141{
142 const char *format;
143 char buf[INET6_ADDRSTRLEN];
144 char *tmp;
145
146 tmp = NULL;
147 switch (record->type)
148 {
149 case GNUNET_DNSPARSER_TYPE_A:
150 if (record->data.raw.data_len != sizeof(struct in_addr))
151 format = "<invalid>";
152 else
153 format = inet_ntop (AF_INET, record->data.raw.data, buf, sizeof(buf));
154 break;
155
156 case GNUNET_DNSPARSER_TYPE_AAAA:
157 if (record->data.raw.data_len != sizeof(struct in6_addr))
158 format = "<invalid>";
159 else
160 format = inet_ntop (AF_INET6, record->data.raw.data, buf, sizeof(buf));
161 break;
162
163 case GNUNET_DNSPARSER_TYPE_NS:
164 case GNUNET_DNSPARSER_TYPE_CNAME:
165 case GNUNET_DNSPARSER_TYPE_PTR:
166 format = record->data.hostname;
167 break;
168
169 case GNUNET_DNSPARSER_TYPE_SOA:
170 if (NULL == record->data.soa)
171 format = "<invalid>";
172 else
173 {
174 GNUNET_asprintf (&tmp,
175 "origin: %s, mail: %s, serial = %u, refresh = %u s, retry = %u s, expire = %u s, minimum = %u s",
176 record->data.soa->mname,
177 record->data.soa->rname,
178 (unsigned int) record->data.soa->serial,
179 (unsigned int) record->data.soa->refresh,
180 (unsigned int) record->data.soa->retry,
181 (unsigned int) record->data.soa->expire,
182 (unsigned int) record->data.soa->minimum_ttl);
183 format = tmp;
184 }
185 break;
186
187 case GNUNET_DNSPARSER_TYPE_MX:
188 if (record->data.mx == NULL)
189 format = "<invalid>";
190 else
191 {
192 GNUNET_asprintf (&tmp,
193 "%u: %s",
194 record->data.mx->preference,
195 record->data.mx->mxhost);
196 format = tmp;
197 }
198 break;
199
200 case GNUNET_DNSPARSER_TYPE_SRV:
201 if (NULL == record->data.srv)
202 format = "<invalid>";
203 else
204 {
205 GNUNET_asprintf (&tmp,
206 "priority %u, weight = %u, port = %u, target = %s",
207 (unsigned int) record->data.srv->priority,
208 (unsigned int) record->data.srv->weight,
209 (unsigned int) record->data.srv->port,
210 record->data.srv->target);
211 format = tmp;
212 }
213 break;
214
215 case GNUNET_DNSPARSER_TYPE_TXT:
216 GNUNET_asprintf (&tmp,
217 "%.*s",
218 (unsigned int) record->data.raw.data_len,
219 (char*) record->data.raw.data);
220 format = tmp;
221 break;
222
223 default:
224 format = "<payload>";
225 break;
226 }
227 fprintf (stdout,
228 "\t\t%s %s: %s = %s (%u s)\n",
229 get_class (record->dns_traffic_class),
230 get_type (record->type),
231 record->name,
232 format,
233 (unsigned int) (GNUNET_TIME_absolute_get_remaining (
234 record->expiration_time).rel_value_us / 1000LL
235 / 1000LL));
236 GNUNET_free (tmp);
237}
238
239
240/**
241 * Signature of a function that is called whenever the DNS service
242 * encounters a DNS request and needs to do something with it. The
243 * function has then the chance to generate or modify the response by
244 * calling one of the three "GNUNET_DNS_request_*" continuations.
245 *
246 * When a request is intercepted, this function is called first to
247 * give the client a chance to do the complete address resolution;
248 * "rdata" will be NULL for this first call for a DNS request, unless
249 * some other client has already filled in a response.
250 *
251 * If multiple clients exist, all of them are called before the global
252 * DNS. The global DNS is only called if all of the clients'
253 * functions call GNUNET_DNS_request_forward. Functions that call
254 * GNUNET_DNS_request_forward will be called again before a final
255 * response is returned to the application. If any of the clients'
256 * functions call GNUNET_DNS_request_drop, the response is dropped.
257 *
258 * @param cls closure
259 * @param rh request handle to user for reply
260 * @param request_length number of bytes in request
261 * @param request udp payload of the DNS request
262 */
263static void
264display_request (void *cls,
265 struct GNUNET_DNS_RequestHandle *rh,
266 size_t request_length,
267 const char *request)
268{
269 static const char *return_codes[] = {
270 "No error", "Format error", "Server failure", "Name error",
271 "Not implemented", "Refused", "YXDomain", "YXRRset",
272 "NXRRset", "NOT AUTH", "NOT ZONE", "<invalid>",
273 "<invalid>", "<invalid>", "<invalid>", "<invalid>"
274 };
275 static const char *op_codes[] = {
276 "Query", "Inverse query", "Status", "<invalid>",
277 "<invalid>", "<invalid>", "<invalid>", "<invalid>",
278 "<invalid>", "<invalid>", "<invalid>", "<invalid>",
279 "<invalid>", "<invalid>", "<invalid>", "<invalid>"
280 };
281 struct GNUNET_DNSPARSER_Packet *p;
282 unsigned int i;
283
284 p = GNUNET_DNSPARSER_parse (request, request_length);
285 if (NULL == p)
286 {
287 fprintf (stderr, "Received malformed DNS packet!\n");
288 // FIXME: drop instead?
289 GNUNET_DNS_request_forward (rh);
290 return;
291 }
292 fprintf (stdout,
293 "%s with ID: %5u Flags: %s%s%s%s%s%s, Return Code: %s, Opcode: %s\n",
294 p->flags.query_or_response ? "Response" : "Query",
295 p->id,
296 p->flags.recursion_desired ? "RD " : "",
297 p->flags.message_truncated ? "MT " : "",
298 p->flags.authoritative_answer ? "AA " : "",
299 p->flags.checking_disabled ? "CD " : "",
300 p->flags.authenticated_data ? "AD " : "",
301 p->flags.recursion_available ? "RA " : "",
302 return_codes[p->flags.return_code & 15],
303 op_codes[p->flags.opcode & 15]);
304 if (p->num_queries > 0)
305 fprintf (stdout,
306 "\tQueries:\n");
307 for (i = 0; i < p->num_queries; i++)
308 display_query (&p->queries[i]);
309
310 if (p->num_answers > 0)
311 fprintf (stdout,
312 "\tAnswers:\n");
313 for (i = 0; i < p->num_answers; i++)
314 display_record (&p->answers[i]);
315 fprintf (stdout, "\n");
316 GNUNET_DNSPARSER_free_packet (p);
317 GNUNET_DNS_request_forward (rh);
318}
319
320
321/**
322 * Shutdown.
323 */
324static void
325do_disconnect (void *cls)
326{
327 if (NULL != handle)
328 {
329 GNUNET_DNS_disconnect (handle);
330 handle = NULL;
331 }
332}
333
334
335/**
336 * Main function that will be run by the scheduler.
337 *
338 * @param cls closure
339 * @param args remaining command-line arguments
340 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
341 * @param cfg configuration
342 */
343static void
344run (void *cls, char *const *args, const char *cfgfile,
345 const struct GNUNET_CONFIGURATION_Handle *cfg)
346{
347 enum GNUNET_DNS_Flags flags;
348
349 flags = GNUNET_DNS_FLAG_REQUEST_MONITOR | GNUNET_DNS_FLAG_RESPONSE_MONITOR;
350 if (inbound_only | outbound_only)
351 flags = 0;
352 if (inbound_only)
353 flags |= GNUNET_DNS_FLAG_REQUEST_MONITOR;
354 if (outbound_only)
355 flags |= GNUNET_DNS_FLAG_RESPONSE_MONITOR;
356 handle =
357 GNUNET_DNS_connect (cfg,
358 flags,
359 &display_request,
360 NULL);
361 GNUNET_SCHEDULER_add_shutdown (&do_disconnect, NULL);
362}
363
364
365int
366main (int argc, char *const *argv)
367{
368 struct GNUNET_GETOPT_CommandLineOption options[] = {
369 GNUNET_GETOPT_option_flag ('i',
370 "inbound-only",
371 gettext_noop ("only monitor DNS queries"),
372 &inbound_only),
373
374 GNUNET_GETOPT_option_flag ('o',
375 "outbound-only",
376 gettext_noop ("only monitor DNS queries"),
377 &outbound_only),
378
379 GNUNET_GETOPT_option_verbose (&verbosity),
380 GNUNET_GETOPT_OPTION_END
381 };
382
383 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
384 return 2;
385 ret = (GNUNET_OK ==
386 GNUNET_PROGRAM_run (argc, argv, "gnunet-dns-monitor",
387 gettext_noop
388 ("Monitor DNS queries."), options,
389 &run, NULL)) ? ret : 1;
390 GNUNET_free_nz ((void *) argv);
391 return ret;
392}
393
394
395/* end of gnunet-dns-monitor.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-23 06:53:31 +0000