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cb3c27e8 | 1 | /* Test basic nss_dns functionality with multiple threads. |
04277e02 | 2 | Copyright (C) 2016-2019 Free Software Foundation, Inc. |
cb3c27e8 FW |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* Unlike tst-resolv-basic, this test does not overwrite the _res | |
20 | structure and relies on namespaces to achieve the redirection to | |
21 | the test servers with a custom /etc/resolv.conf file. */ | |
22 | ||
23 | #include <dlfcn.h> | |
24 | #include <errno.h> | |
25 | #include <gnu/lib-names.h> | |
26 | #include <netdb.h> | |
27 | #include <resolv/resolv-internal.h> | |
28 | #include <resolv/resolv_context.h> | |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <support/check.h> | |
33 | #include <support/namespace.h> | |
34 | #include <support/resolv_test.h> | |
35 | #include <support/support.h> | |
36 | #include <support/temp_file.h> | |
37 | #include <support/test-driver.h> | |
38 | #include <support/xthread.h> | |
39 | #include <support/xunistd.h> | |
40 | ||
41 | /* Each client thread sends this many queries. */ | |
42 | enum { queries_per_thread = 500 }; | |
43 | ||
44 | /* Return a small positive number identifying this thread. */ | |
45 | static int | |
46 | get_thread_number (void) | |
47 | { | |
48 | static int __thread local; | |
49 | if (local != 0) | |
50 | return local; | |
51 | static int global = 1; | |
52 | local = __atomic_fetch_add (&global, 1, __ATOMIC_RELAXED); | |
53 | return local; | |
54 | } | |
55 | ||
56 | static void | |
57 | response (const struct resolv_response_context *ctx, | |
58 | struct resolv_response_builder *b, | |
59 | const char *qname, uint16_t qclass, uint16_t qtype) | |
60 | { | |
61 | TEST_VERIFY_EXIT (qname != NULL); | |
62 | ||
63 | int counter = 0; | |
64 | int thread = 0; | |
65 | int dummy = 0; | |
66 | TEST_VERIFY (sscanf (qname, "counter%d.thread%d.example.com%n", | |
67 | &counter, &thread, &dummy) == 2); | |
68 | TEST_VERIFY (dummy > 0); | |
69 | ||
70 | struct resolv_response_flags flags = { 0 }; | |
71 | resolv_response_init (b, flags); | |
72 | resolv_response_add_question (b, qname, qclass, qtype); | |
73 | ||
74 | resolv_response_section (b, ns_s_an); | |
75 | resolv_response_open_record (b, qname, qclass, qtype, 0); | |
76 | switch (qtype) | |
77 | { | |
78 | case T_A: | |
79 | { | |
80 | char ipv4[4] = {10, 0, counter, thread}; | |
81 | resolv_response_add_data (b, &ipv4, sizeof (ipv4)); | |
82 | } | |
83 | break; | |
84 | case T_AAAA: | |
85 | { | |
86 | char ipv6[16] | |
87 | = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, | |
88 | counter, 0, thread, 0, 0}; | |
89 | resolv_response_add_data (b, &ipv6, sizeof (ipv6)); | |
90 | } | |
91 | break; | |
92 | default: | |
93 | support_record_failure (); | |
94 | printf ("error: unexpected QTYPE: %s/%u/%u\n", | |
95 | qname, qclass, qtype); | |
96 | } | |
97 | resolv_response_close_record (b); | |
98 | } | |
99 | ||
100 | /* Check that the resolver configuration for this thread has an | |
101 | extended resolver configuration. */ | |
102 | static void | |
103 | check_have_conf (void) | |
104 | { | |
105 | struct resolv_context *ctx = __resolv_context_get (); | |
106 | TEST_VERIFY_EXIT (ctx != NULL); | |
107 | TEST_VERIFY (ctx->conf != NULL); | |
108 | __resolv_context_put (ctx); | |
109 | } | |
110 | ||
111 | /* Verify that E matches the expected response for FAMILY and | |
112 | COUNTER. */ | |
113 | static void | |
114 | check_hostent (const char *caller, const char *function, const char *qname, | |
115 | int ret, struct hostent *e, int family, int counter) | |
116 | { | |
117 | if (ret != 0) | |
118 | { | |
119 | errno = ret; | |
120 | support_record_failure (); | |
121 | printf ("error: %s: %s for %s failed: %m\n", caller, function, qname); | |
122 | return; | |
123 | } | |
124 | ||
125 | TEST_VERIFY_EXIT (e != NULL); | |
126 | TEST_VERIFY (strcmp (qname, e->h_name) == 0); | |
127 | TEST_VERIFY (e->h_addrtype == family); | |
128 | TEST_VERIFY_EXIT (e->h_addr_list[0] != NULL); | |
129 | TEST_VERIFY (e->h_addr_list[1] == NULL); | |
130 | switch (family) | |
131 | { | |
132 | case AF_INET: | |
133 | { | |
134 | char addr[4] = {10, 0, counter, get_thread_number ()}; | |
135 | TEST_VERIFY (e->h_length == sizeof (addr)); | |
136 | TEST_VERIFY (memcmp (e->h_addr_list[0], addr, sizeof (addr)) == 0); | |
137 | } | |
138 | break; | |
139 | case AF_INET6: | |
140 | { | |
141 | char addr[16] | |
142 | = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, | |
143 | 0, counter, 0, get_thread_number (), 0, 0}; | |
144 | TEST_VERIFY (e->h_length == sizeof (addr)); | |
145 | TEST_VERIFY (memcmp (e->h_addr_list[0], addr, sizeof (addr)) == 0); | |
146 | } | |
147 | break; | |
148 | default: | |
149 | FAIL_EXIT1 ("%s: invalid address family %d", caller, family); | |
150 | } | |
151 | check_have_conf (); | |
152 | } | |
153 | ||
154 | /* Check a getaddrinfo result. */ | |
155 | static void | |
156 | check_addrinfo (const char *caller, const char *qname, | |
157 | int ret, struct addrinfo *ai, int family, int counter) | |
158 | { | |
159 | if (ret != 0) | |
160 | { | |
161 | support_record_failure (); | |
162 | printf ("error: %s: getaddrinfo for %s failed: %s\n", | |
163 | caller, qname, gai_strerror (ret)); | |
164 | return; | |
165 | } | |
166 | ||
167 | TEST_VERIFY_EXIT (ai != NULL); | |
168 | ||
169 | /* Check that available data matches the requirements. */ | |
170 | bool have_ipv4 = false; | |
171 | bool have_ipv6 = false; | |
172 | for (struct addrinfo *p = ai; p != NULL; p = p->ai_next) | |
173 | { | |
174 | TEST_VERIFY (p->ai_socktype == SOCK_STREAM); | |
175 | TEST_VERIFY (p->ai_protocol == IPPROTO_TCP); | |
176 | TEST_VERIFY_EXIT (p->ai_addr != NULL); | |
177 | TEST_VERIFY (p->ai_addr->sa_family == p->ai_family); | |
178 | ||
179 | switch (p->ai_family) | |
180 | { | |
181 | case AF_INET: | |
182 | { | |
183 | TEST_VERIFY (!have_ipv4); | |
184 | have_ipv4 = true; | |
185 | struct sockaddr_in *sa = (struct sockaddr_in *) p->ai_addr; | |
186 | TEST_VERIFY (p->ai_addrlen == sizeof (*sa)); | |
187 | char addr[4] = {10, 0, counter, get_thread_number ()}; | |
188 | TEST_VERIFY (memcmp (&sa->sin_addr, addr, sizeof (addr)) == 0); | |
189 | TEST_VERIFY (ntohs (sa->sin_port) == 80); | |
190 | } | |
191 | break; | |
192 | case AF_INET6: | |
193 | { | |
194 | TEST_VERIFY (!have_ipv6); | |
195 | have_ipv6 = true; | |
196 | struct sockaddr_in6 *sa = (struct sockaddr_in6 *) p->ai_addr; | |
197 | TEST_VERIFY (p->ai_addrlen == sizeof (*sa)); | |
198 | char addr[16] | |
199 | = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, | |
200 | 0, counter, 0, get_thread_number (), 0, 0}; | |
201 | TEST_VERIFY (memcmp (&sa->sin6_addr, addr, sizeof (addr)) == 0); | |
202 | TEST_VERIFY (ntohs (sa->sin6_port) == 80); | |
203 | } | |
204 | break; | |
205 | default: | |
206 | FAIL_EXIT1 ("%s: invalid address family %d", caller, family); | |
207 | } | |
208 | } | |
209 | ||
210 | switch (family) | |
211 | { | |
212 | case AF_INET: | |
213 | TEST_VERIFY (have_ipv4); | |
214 | TEST_VERIFY (!have_ipv6); | |
215 | break; | |
216 | case AF_INET6: | |
217 | TEST_VERIFY (!have_ipv4); | |
218 | TEST_VERIFY (have_ipv6); | |
219 | break; | |
220 | case AF_UNSPEC: | |
221 | TEST_VERIFY (have_ipv4); | |
222 | TEST_VERIFY (have_ipv6); | |
223 | break; | |
224 | default: | |
225 | FAIL_EXIT1 ("%s: invalid address family %d", caller, family); | |
226 | } | |
227 | ||
228 | check_have_conf (); | |
229 | } | |
230 | ||
231 | /* This barrier ensures that all test threads begin their work | |
232 | simultaneously. */ | |
233 | static pthread_barrier_t barrier; | |
234 | ||
235 | /* Test gethostbyname2_r (if do_2 is false) or gethostbyname2_r with | |
236 | AF_INET (if do_2 is true). */ | |
237 | static void * | |
238 | byname (bool do_2) | |
239 | { | |
240 | int this_thread = get_thread_number (); | |
241 | xpthread_barrier_wait (&barrier); | |
242 | for (int i = 0; i < queries_per_thread; ++i) | |
243 | { | |
244 | char qname[100]; | |
245 | snprintf (qname, sizeof (qname), "counter%d.thread%d.example.com", | |
246 | i, this_thread); | |
247 | struct hostent storage; | |
248 | char buf[1000]; | |
249 | struct hostent *e = NULL; | |
250 | int herrno; | |
251 | int ret; | |
252 | if (do_2) | |
253 | ret = gethostbyname_r (qname, &storage, buf, sizeof (buf), | |
254 | &e, &herrno); | |
255 | else | |
256 | ret = gethostbyname2_r (qname, AF_INET, &storage, buf, sizeof (buf), | |
257 | &e, &herrno); | |
258 | check_hostent (__func__, do_2 ? "gethostbyname2_r" : "gethostbyname_r", | |
259 | qname, ret, e, AF_INET, i); | |
260 | } | |
261 | check_have_conf (); | |
262 | return NULL; | |
263 | } | |
264 | ||
265 | /* Test gethostbyname_r. */ | |
266 | static void * | |
267 | thread_byname (void *closure) | |
268 | { | |
269 | return byname (false); | |
270 | } | |
271 | ||
272 | /* Test gethostbyname2_r with AF_INET. */ | |
273 | static void * | |
274 | thread_byname2 (void *closure) | |
275 | { | |
276 | return byname (true); | |
277 | } | |
278 | ||
3f8b44be | 279 | /* Test gethostbyname2_r with AF_INET6. */ |
cb3c27e8 | 280 | static void * |
3f8b44be | 281 | thread_byname2_af_inet6 (void *closure) |
cb3c27e8 FW |
282 | { |
283 | int this_thread = get_thread_number (); | |
284 | xpthread_barrier_wait (&barrier); | |
cb3c27e8 FW |
285 | for (int i = 0; i < queries_per_thread; ++i) |
286 | { | |
287 | char qname[100]; | |
288 | snprintf (qname, sizeof (qname), "counter%d.thread%d.example.com", | |
289 | i, this_thread); | |
290 | struct hostent storage; | |
291 | char buf[1000]; | |
292 | struct hostent *e = NULL; | |
293 | int herrno; | |
3f8b44be FW |
294 | int ret = gethostbyname2_r (qname, AF_INET6, &storage, buf, sizeof (buf), |
295 | &e, &herrno); | |
296 | check_hostent (__func__, "gethostbyname2_r", qname, ret, e, AF_INET6, i); | |
cb3c27e8 FW |
297 | } |
298 | return NULL; | |
299 | } | |
300 | ||
cb3c27e8 FW |
301 | /* Run getaddrinfo tests for FAMILY. */ |
302 | static void * | |
3f8b44be | 303 | gai (int family) |
cb3c27e8 FW |
304 | { |
305 | int this_thread = get_thread_number (); | |
306 | xpthread_barrier_wait (&barrier); | |
cb3c27e8 FW |
307 | for (int i = 0; i < queries_per_thread; ++i) |
308 | { | |
309 | char qname[100]; | |
310 | snprintf (qname, sizeof (qname), "counter%d.thread%d.example.com", | |
311 | i, this_thread); | |
312 | struct addrinfo hints = | |
313 | { | |
314 | .ai_family = family, | |
315 | .ai_socktype = SOCK_STREAM, | |
316 | .ai_protocol = IPPROTO_TCP, | |
317 | }; | |
318 | struct addrinfo *ai; | |
319 | int ret = getaddrinfo (qname, "80", &hints, &ai); | |
320 | check_addrinfo (__func__, qname, ret, ai, family, i); | |
321 | if (ret == 0) | |
322 | freeaddrinfo (ai); | |
323 | } | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | /* Test getaddrinfo with AF_INET. */ | |
328 | static void * | |
329 | thread_gai_inet (void *closure) | |
330 | { | |
3f8b44be | 331 | return gai (AF_INET); |
cb3c27e8 FW |
332 | } |
333 | ||
334 | /* Test getaddrinfo with AF_INET6. */ | |
335 | static void * | |
336 | thread_gai_inet6 (void *closure) | |
337 | { | |
3f8b44be | 338 | return gai (AF_INET6); |
cb3c27e8 FW |
339 | } |
340 | ||
341 | /* Test getaddrinfo with AF_UNSPEC. */ | |
342 | static void * | |
343 | thread_gai_unspec (void *closure) | |
344 | { | |
3f8b44be | 345 | return gai (AF_UNSPEC); |
cb3c27e8 FW |
346 | } |
347 | ||
348 | /* Description of the chroot environment used to run the tests. */ | |
349 | static struct support_chroot *chroot_env; | |
350 | ||
351 | /* Set up the chroot environment. */ | |
352 | static void | |
353 | prepare (int argc, char **argv) | |
354 | { | |
355 | chroot_env = support_chroot_create | |
356 | ((struct support_chroot_configuration) | |
357 | { | |
358 | .resolv_conf = | |
359 | "search example.com\n" | |
360 | "nameserver 127.0.0.1\n" | |
361 | "nameserver 127.0.0.2\n" | |
362 | "nameserver 127.0.0.3\n", | |
363 | }); | |
364 | } | |
365 | ||
366 | static int | |
367 | do_test (void) | |
368 | { | |
369 | support_become_root (); | |
370 | if (!support_enter_network_namespace ()) | |
371 | return EXIT_UNSUPPORTED; | |
372 | if (!support_can_chroot ()) | |
373 | return EXIT_UNSUPPORTED; | |
374 | ||
375 | /* Load the shared object outside of the chroot. */ | |
376 | TEST_VERIFY (dlopen (LIBNSS_DNS_SO, RTLD_LAZY) != NULL); | |
377 | ||
378 | xchroot (chroot_env->path_chroot); | |
379 | TEST_VERIFY_EXIT (chdir ("/") == 0); | |
380 | ||
381 | struct sockaddr_in server_address = | |
382 | { | |
383 | .sin_family = AF_INET, | |
384 | .sin_addr = { .s_addr = htonl (INADDR_LOOPBACK) }, | |
385 | .sin_port = htons (53) | |
386 | }; | |
387 | const struct sockaddr *server_addresses[1] = | |
388 | { (const struct sockaddr *) &server_address }; | |
389 | ||
390 | struct resolv_test *aux = resolv_test_start | |
391 | ((struct resolv_redirect_config) | |
392 | { | |
393 | .response_callback = response, | |
394 | .nscount = 1, | |
395 | .disable_redirect = true, | |
396 | .server_address_overrides = server_addresses, | |
397 | }); | |
398 | ||
3f8b44be | 399 | enum { thread_count = 6 }; |
cb3c27e8 FW |
400 | xpthread_barrier_init (&barrier, NULL, thread_count + 1); |
401 | pthread_t threads[thread_count]; | |
402 | typedef void *(*thread_func) (void *); | |
403 | thread_func thread_funcs[thread_count] = | |
404 | { | |
405 | thread_byname, | |
406 | thread_byname2, | |
cb3c27e8 FW |
407 | thread_byname2_af_inet6, |
408 | thread_gai_inet, | |
409 | thread_gai_inet6, | |
410 | thread_gai_unspec, | |
cb3c27e8 FW |
411 | }; |
412 | for (int i = 0; i < thread_count; ++i) | |
413 | threads[i] = xpthread_create (NULL, thread_funcs[i], NULL); | |
414 | xpthread_barrier_wait (&barrier); /* Start the test threads. */ | |
415 | for (int i = 0; i < thread_count; ++i) | |
416 | xpthread_join (threads[i]); | |
417 | ||
418 | resolv_test_end (aux); | |
419 | support_chroot_free (chroot_env); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | #define PREPARE prepare | |
425 | #include <support/test-driver.c> |