1 /* Test basic nss_dns functionality and the resolver test harness itself.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <support/check.h>
24 #include <support/check_nss.h>
25 #include <support/format_nss.h>
26 #include <support/resolv_test.h>
27 #include <support/support.h>
28
29 #define LONG_NAME \
30 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaax." \
31 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay." \
32 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaz." \
33 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaat"
34
35 static void
36 response (const struct resolv_response_context *ctx,
37 struct resolv_response_builder *b,
38 const char *qname, uint16_t qclass, uint16_t qtype)
39 {
40 TEST_VERIFY_EXIT (qname != NULL);
41
42 /* The "t." prefix can be used to request TCP fallback. */
43 bool force_tcp;
44 if (strncmp ("t.", qname, 2) == 0)
45 force_tcp = true;
46 else
47 force_tcp = false;
48 const char *qname_compare;
49 if (force_tcp)
50 qname_compare = qname + 2;
51 else
52 qname_compare = qname;
53 enum {www, alias, nxdomain, long_name, nodata} requested_qname;
54 if (strcmp (qname_compare, "www.example") == 0)
55 requested_qname = www;
56 else if (strcmp (qname_compare, "alias.example") == 0)
57 requested_qname = alias;
58 else if (strcmp (qname_compare, "nxdomain.example") == 0)
59 requested_qname = nxdomain;
60 else if (strcmp (qname_compare, LONG_NAME) == 0)
61 requested_qname = long_name;
62 else if (strcmp (qname_compare, "nodata.example") == 0)
63 requested_qname = nodata;
64 else
65 {
66 support_record_failure ();
67 printf ("error: unexpected QNAME: %s\n", qname);
68 return;
69 }
70 TEST_VERIFY_EXIT (qclass == C_IN);
71 struct resolv_response_flags flags = {.tc = force_tcp && !ctx->tcp};
72 if (requested_qname == nxdomain)
73 flags.rcode = 3; /* NXDOMAIN */
74 resolv_response_init (b, flags);
75 resolv_response_add_question (b, qname, qclass, qtype);
76 if (requested_qname == nxdomain || flags.tc)
77 return;
78
79 resolv_response_section (b, ns_s_an);
80 switch (requested_qname)
81 {
82 case www:
83 case long_name:
84 resolv_response_open_record (b, qname, qclass, qtype, 0);
85 break;
86 case alias:
87 resolv_response_open_record (b, qname, qclass, T_CNAME, 0);
88 resolv_response_add_name (b, "www.example");
89 resolv_response_close_record (b);
90 resolv_response_open_record (b, "www.example", qclass, qtype, 0);
91 break;
92 case nodata:
93 return;
94 case nxdomain:
95 FAIL_EXIT1 ("unreachable");
96 }
97 switch (qtype)
98 {
99 case T_A:
100 {
101 char ipv4[4] = {192, 0, 2, 17};
102 ipv4[3] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
103 resolv_response_add_data (b, &ipv4, sizeof (ipv4));
104 }
105 break;
106 case T_AAAA:
107 {
108 char ipv6[16]
109 = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
110 ipv6[15] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
111 resolv_response_add_data (b, &ipv6, sizeof (ipv6));
112 }
113 break;
114 default:
115 support_record_failure ();
116 printf ("error: unexpected QTYPE: %s/%u/%u\n",
117 qname, qclass, qtype);
118 }
119 resolv_response_close_record (b);
120 }
121
122 static void
123 check_h (const char *name, int family, const char *expected)
124 {
125 if (family == AF_INET)
126 {
127 char *query = xasprintf ("gethostbyname (\"%s\")", name);
128 check_hostent (query, gethostbyname (name), expected);
129 free (query);
130 }
131 {
132 char *query = xasprintf ("gethostbyname2 (\"%s\", %d)", name, family);
133 check_hostent (query, gethostbyname2 (name, family), expected);
134 free (query);
135 }
136
137 bool too_small = true;
138 for (unsigned int offset = 0; offset < 8; ++offset)
139 for (unsigned int size = 1; too_small; ++size)
140 {
141 char *buf = xmalloc (offset + size);
142 too_small = false;
143
144 struct hostent hostbuf;
145 struct hostent *result;
146 int herror;
147 if (family == AF_INET)
148 {
149 char *query = xasprintf ("gethostbyname (\"%s\") %u/%u",
150 name, offset, size);
151 int ret = gethostbyname_r
152 (name, &hostbuf, buf + offset, size, &result, &herror);
153 if (ret == 0)
154 {
155 h_errno = herror;
156 check_hostent (query, result, expected);
157 }
158 else if (ret == ERANGE)
159 too_small = true;
160 else
161 {
162 errno = ret;
163 FAIL_EXIT1 ("gethostbyname_r: %m");
164 }
165 free (query);
166 memset (buf, 0, offset + size);
167 }
168 char *query = xasprintf ("gethostbyname2 (\"%s\", %d) %u/%u",
169 name, family, offset, size);
170 int ret = gethostbyname2_r
171 (name, family, &hostbuf, buf + offset, size, &result, &herror);
172 if (ret == 0)
173 {
174 h_errno = herror;
175 check_hostent (query, result, expected);
176 }
177 else if (ret == ERANGE)
178 too_small = true;
179 else
180 {
181 errno = ret;
182 FAIL_EXIT1 ("gethostbyname_r: %m");
183 }
184 free (buf);
185 free (query);
186 }
187 }
188
189 static void
190 check_ai_hints (const char *name, const char *service,
191 struct addrinfo hints, const char *expected)
192 {
193 struct addrinfo *ai;
194 char *query = xasprintf ("%s:%s [%d]/0x%x", name, service,
195 hints.ai_family, hints.ai_flags);
196 int ret = getaddrinfo (name, service, &hints, &ai);
197 check_addrinfo (query, ai, ret, expected);
198 if (ret == 0)
199 freeaddrinfo (ai);
200 free (query);
201 }
202
203 static void
204 check_ai (const char *name, const char *service,
205 int family, const char *expected)
206 {
207 return check_ai_hints (name, service,
208 (struct addrinfo) { .ai_family = family, },
209 expected);
210 }
211
212 /* Test for bug 21295: getaddrinfo used to discard address information
213 instead of merging it. */
214 static void
215 test_bug_21295 (void)
216 {
217 /* The address order is unpredictable. There are two factors which
218 contribute to that: The stub resolver does not perform proper
219 response matching for A/AAAA queries (an A response could be
220 associated with an AAAA query and vice versa), and without
221 namespaces, system configuration could affect address
222 ordering. */
223 for (int do_tcp = 0; do_tcp < 2; ++do_tcp)
224 {
225 const struct addrinfo hints =
226 {
227 .ai_family = AF_INET6,
228 .ai_socktype = SOCK_STREAM,
229 .ai_flags = AI_V4MAPPED | AI_ALL,
230 };
231 const char *qname;
232 if (do_tcp)
233 qname = "t.www.example";
234 else
235 qname = "www.example";
236 struct addrinfo *ai = NULL;
237 int ret = getaddrinfo (qname, "80", &hints, &ai);
238 TEST_VERIFY_EXIT (ret == 0);
239
240 const char *expected_a;
241 const char *expected_b;
242 if (do_tcp)
243 {
244 expected_a = "flags: AI_V4MAPPED AI_ALL\n"
245 "address: STREAM/TCP 2001:db8::3 80\n"
246 "address: STREAM/TCP ::ffff:192.0.2.19 80\n";
247 expected_b = "flags: AI_V4MAPPED AI_ALL\n"
248 "address: STREAM/TCP ::ffff:192.0.2.19 80\n"
249 "address: STREAM/TCP 2001:db8::3 80\n";
250 }
251 else
252 {
253 expected_a = "flags: AI_V4MAPPED AI_ALL\n"
254 "address: STREAM/TCP 2001:db8::1 80\n"
255 "address: STREAM/TCP ::ffff:192.0.2.17 80\n";
256 expected_b = "flags: AI_V4MAPPED AI_ALL\n"
257 "address: STREAM/TCP ::ffff:192.0.2.17 80\n"
258 "address: STREAM/TCP 2001:db8::1 80\n";
259 }
260
261 char *actual = support_format_addrinfo (ai, ret);
262 if (!(strcmp (actual, expected_a) == 0
263 || strcmp (actual, expected_b) == 0))
264 {
265 support_record_failure ();
266 printf ("error: %s: unexpected response (TCP: %d):\n%s\n",
267 __func__, do_tcp, actual);
268 }
269 free (actual);
270 freeaddrinfo (ai);
271 }
272 }
273
274 /* Run tests which do not expect any data. */
275 static void
276 test_nodata_nxdomain (void)
277 {
278 /* Iterate through different address families. */
279 int families[] = { AF_UNSPEC, AF_INET, AF_INET6, -1 };
280 for (int i = 0; families[i] >= 0; ++i)
281 /* If do_tcp, prepend "t." to the name to trigger TCP
282 fallback. */
283 for (int do_tcp = 0; do_tcp < 2; ++do_tcp)
284 /* If do_nxdomain, trigger an NXDOMAIN error (DNS failure),
285 otherwise use a NODATA response (empty but successful
286 answer). */
287 for (int do_nxdomain = 0; do_nxdomain < 2; ++do_nxdomain)
288 {
289 int family = families[i];
290 char *name = xasprintf ("%s%s.example",
291 do_tcp ? "t." : "",
292 do_nxdomain ? "nxdomain" : "nodata");
293
294 if (family != AF_UNSPEC)
295 {
296 if (do_nxdomain)
297 check_h (name, family, "error: HOST_NOT_FOUND\n");
298 else
299 check_h (name, family, "error: NO_ADDRESS\n");
300 }
301
302 const char *expected;
303 if (do_nxdomain)
304 expected = "error: Name or service not known\n";
305 else
306 expected = "error: No address associated with hostname\n";
307
308 check_ai (name, "80", family, expected);
309
310 struct addrinfo hints =
311 {
312 .ai_family = family,
313 .ai_flags = AI_V4MAPPED | AI_ALL,
314 };
315 check_ai_hints (name, "80", hints, expected);
316 hints.ai_flags |= AI_CANONNAME;
317 check_ai_hints (name, "80", hints, expected);
318
319 free (name);
320 }
321 }
322
323 static int
324 do_test (void)
325 {
326 struct resolv_test *aux = resolv_test_start
327 ((struct resolv_redirect_config)
328 {
329 .response_callback = response,
330 });
331
332 check_h ("www.example", AF_INET,
333 "name: www.example\n"
334 "address: 192.0.2.17\n");
335 check_h ("alias.example", AF_INET,
336 "name: www.example\n"
337 "alias: alias.example\n"
338 "address: 192.0.2.18\n");
339 check_h ("www.example", AF_INET6,
340 "name: www.example\n"
341 "address: 2001:db8::1\n");
342 check_h ("alias.example", AF_INET6,
343 "name: www.example\n"
344 "alias: alias.example\n"
345 "address: 2001:db8::2\n");
346 check_h (LONG_NAME, AF_INET,
347 "name: " LONG_NAME "\n"
348 "address: 192.0.2.20\n");
349
350 check_ai ("www.example", "80", AF_UNSPEC,
351 "address: STREAM/TCP 192.0.2.17 80\n"
352 "address: DGRAM/UDP 192.0.2.17 80\n"
353 "address: RAW/IP 192.0.2.17 80\n"
354 "address: STREAM/TCP 2001:db8::1 80\n"
355 "address: DGRAM/UDP 2001:db8::1 80\n"
356 "address: RAW/IP 2001:db8::1 80\n");
357 check_ai_hints ("www.example", "80",
358 (struct addrinfo) { .ai_family = AF_UNSPEC,
359 .ai_flags = AI_CANONNAME, },
360 "flags: AI_CANONNAME\n"
361 "canonname: www.example\n"
362 "address: STREAM/TCP 192.0.2.17 80\n"
363 "address: DGRAM/UDP 192.0.2.17 80\n"
364 "address: RAW/IP 192.0.2.17 80\n"
365 "address: STREAM/TCP 2001:db8::1 80\n"
366 "address: DGRAM/UDP 2001:db8::1 80\n"
367 "address: RAW/IP 2001:db8::1 80\n");
368 check_ai ("alias.example", "80", AF_UNSPEC,
369 "address: STREAM/TCP 192.0.2.18 80\n"
370 "address: DGRAM/UDP 192.0.2.18 80\n"
371 "address: RAW/IP 192.0.2.18 80\n"
372 "address: STREAM/TCP 2001:db8::2 80\n"
373 "address: DGRAM/UDP 2001:db8::2 80\n"
374 "address: RAW/IP 2001:db8::2 80\n");
375 check_ai_hints ("alias.example", "80",
376 (struct addrinfo) { .ai_family = AF_UNSPEC,
377 .ai_flags = AI_CANONNAME, },
378 "flags: AI_CANONNAME\n"
379 "canonname: www.example\n"
380 "address: STREAM/TCP 192.0.2.18 80\n"
381 "address: DGRAM/UDP 192.0.2.18 80\n"
382 "address: RAW/IP 192.0.2.18 80\n"
383 "address: STREAM/TCP 2001:db8::2 80\n"
384 "address: DGRAM/UDP 2001:db8::2 80\n"
385 "address: RAW/IP 2001:db8::2 80\n");
386 check_ai (LONG_NAME, "80", AF_UNSPEC,
387 "address: STREAM/TCP 192.0.2.20 80\n"
388 "address: DGRAM/UDP 192.0.2.20 80\n"
389 "address: RAW/IP 192.0.2.20 80\n"
390 "address: STREAM/TCP 2001:db8::4 80\n"
391 "address: DGRAM/UDP 2001:db8::4 80\n"
392 "address: RAW/IP 2001:db8::4 80\n");
393 check_ai ("www.example", "80", AF_INET,
394 "address: STREAM/TCP 192.0.2.17 80\n"
395 "address: DGRAM/UDP 192.0.2.17 80\n"
396 "address: RAW/IP 192.0.2.17 80\n");
397 check_ai_hints ("www.example", "80",
398 (struct addrinfo) { .ai_family = AF_INET,
399 .ai_flags = AI_CANONNAME, },
400 "flags: AI_CANONNAME\n"
401 "canonname: www.example\n"
402 "address: STREAM/TCP 192.0.2.17 80\n"
403 "address: DGRAM/UDP 192.0.2.17 80\n"
404 "address: RAW/IP 192.0.2.17 80\n");
405 check_ai ("alias.example", "80", AF_INET,
406 "address: STREAM/TCP 192.0.2.18 80\n"
407 "address: DGRAM/UDP 192.0.2.18 80\n"
408 "address: RAW/IP 192.0.2.18 80\n");
409 check_ai_hints ("alias.example", "80",
410 (struct addrinfo) { .ai_family = AF_INET,
411 .ai_flags = AI_CANONNAME, },
412 "flags: AI_CANONNAME\n"
413 "canonname: www.example\n"
414 "address: STREAM/TCP 192.0.2.18 80\n"
415 "address: DGRAM/UDP 192.0.2.18 80\n"
416 "address: RAW/IP 192.0.2.18 80\n");
417 check_ai (LONG_NAME, "80", AF_INET,
418 "address: STREAM/TCP 192.0.2.20 80\n"
419 "address: DGRAM/UDP 192.0.2.20 80\n"
420 "address: RAW/IP 192.0.2.20 80\n");
421 check_ai ("www.example", "80", AF_INET6,
422 "address: STREAM/TCP 2001:db8::1 80\n"
423 "address: DGRAM/UDP 2001:db8::1 80\n"
424 "address: RAW/IP 2001:db8::1 80\n");
425 check_ai_hints ("www.example", "80",
426 (struct addrinfo) { .ai_family = AF_INET6,
427 .ai_flags = AI_CANONNAME, },
428 "flags: AI_CANONNAME\n"
429 "canonname: www.example\n"
430 "address: STREAM/TCP 2001:db8::1 80\n"
431 "address: DGRAM/UDP 2001:db8::1 80\n"
432 "address: RAW/IP 2001:db8::1 80\n");
433 check_ai ("alias.example", "80", AF_INET6,
434 "address: STREAM/TCP 2001:db8::2 80\n"
435 "address: DGRAM/UDP 2001:db8::2 80\n"
436 "address: RAW/IP 2001:db8::2 80\n");
437 check_ai_hints ("alias.example", "80",
438 (struct addrinfo) { .ai_family = AF_INET6,
439 .ai_flags = AI_CANONNAME, },
440 "flags: AI_CANONNAME\n"
441 "canonname: www.example\n"
442 "address: STREAM/TCP 2001:db8::2 80\n"
443 "address: DGRAM/UDP 2001:db8::2 80\n"
444 "address: RAW/IP 2001:db8::2 80\n");
445 check_ai (LONG_NAME, "80", AF_INET6,
446 "address: STREAM/TCP 2001:db8::4 80\n"
447 "address: DGRAM/UDP 2001:db8::4 80\n"
448 "address: RAW/IP 2001:db8::4 80\n");
449
450 check_h ("t.www.example", AF_INET,
451 "name: t.www.example\n"
452 "address: 192.0.2.19\n");
453 check_h ("t.alias.example", AF_INET,
454 "name: www.example\n"
455 "alias: t.alias.example\n"
456 "address: 192.0.2.20\n");
457 check_h ("t.www.example", AF_INET6,
458 "name: t.www.example\n"
459 "address: 2001:db8::3\n");
460 check_h ("t.alias.example", AF_INET6,
461 "name: www.example\n"
462 "alias: t.alias.example\n"
463 "address: 2001:db8::4\n");
464 check_ai ("t.www.example", "80", AF_UNSPEC,
465 "address: STREAM/TCP 192.0.2.19 80\n"
466 "address: DGRAM/UDP 192.0.2.19 80\n"
467 "address: RAW/IP 192.0.2.19 80\n"
468 "address: STREAM/TCP 2001:db8::3 80\n"
469 "address: DGRAM/UDP 2001:db8::3 80\n"
470 "address: RAW/IP 2001:db8::3 80\n");
471 check_ai ("t.alias.example", "80", AF_UNSPEC,
472 "address: STREAM/TCP 192.0.2.20 80\n"
473 "address: DGRAM/UDP 192.0.2.20 80\n"
474 "address: RAW/IP 192.0.2.20 80\n"
475 "address: STREAM/TCP 2001:db8::4 80\n"
476 "address: DGRAM/UDP 2001:db8::4 80\n"
477 "address: RAW/IP 2001:db8::4 80\n");
478 check_ai ("t.www.example", "80", AF_INET,
479 "address: STREAM/TCP 192.0.2.19 80\n"
480 "address: DGRAM/UDP 192.0.2.19 80\n"
481 "address: RAW/IP 192.0.2.19 80\n");
482 check_ai ("t.alias.example", "80", AF_INET,
483 "address: STREAM/TCP 192.0.2.20 80\n"
484 "address: DGRAM/UDP 192.0.2.20 80\n"
485 "address: RAW/IP 192.0.2.20 80\n");
486 check_ai ("t.www.example", "80", AF_INET6,
487 "address: STREAM/TCP 2001:db8::3 80\n"
488 "address: DGRAM/UDP 2001:db8::3 80\n"
489 "address: RAW/IP 2001:db8::3 80\n");
490 check_ai ("t.alias.example", "80", AF_INET6,
491 "address: STREAM/TCP 2001:db8::4 80\n"
492 "address: DGRAM/UDP 2001:db8::4 80\n"
493 "address: RAW/IP 2001:db8::4 80\n");
494
495 test_bug_21295 ();
496 test_nodata_nxdomain ();
497
498 resolv_test_end (aux);
499
500 return 0;
501 }
502
503 #include <support/test-driver.c>