1/*	$NetBSD: resolv.c,v 1.6 2004/05/23 16:59:11 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: resolv.c,v 1.6 2004/05/23 16:59:11 christos Exp $");
33
34#include <sys/types.h>
35#include <sys/socket.h>
36#include <assert.h>
37#include <errno.h>
38#include <pthread.h>
39#include <stdio.h>
40#include <stdatomic.h>
41#include <netdb.h>
42#include <stdlib.h>
43#include <unistd.h>
44#include <string.h>
45#include <stringlist.h>
46
47#include <atf-c.h>
48
49#define NTHREADS	10
50#define NHOSTS		100
51#define WS		" \t\n\r"
52
53enum method {
54	METHOD_GETADDRINFO,
55	METHOD_GETHOSTBY,
56	METHOD_GETIPNODEBY
57};
58
59static StringList *hosts = NULL;
60static _Atomic(int) *ask = NULL;
61static _Atomic(int) *got = NULL;
62static bool debug_output = 0;
63
64static void load(const char *);
65static void resolvone(long, int, enum method);
66static void *resolvloop(void *);
67static pthread_t run(int, enum method, long);
68
69#define	DBG(...) do {					\
70	if (debug_output)				\
71		dprintf(STDOUT_FILENO, __VA_ARGS__);	\
72	} while (0)
73
74static void
75load(const char *fname)
76{
77	FILE *fp;
78	size_t linecap;
79	char *line;
80
81	fp = fopen(fname, "r");
82	ATF_REQUIRE(fp != NULL);
83	line = NULL;
84	linecap = 0;
85	while (getline(&line, &linecap, fp) >= 0) {
86		char *ptr;
87
88		for (ptr = strtok(line, WS); ptr; ptr = strtok(NULL, WS)) {
89			if (ptr[0] == '#')
90				break;
91			sl_add(hosts, strdup(ptr));
92		}
93	}
94	free(line);
95
96	(void)fclose(fp);
97}
98
99static int
100resolv_getaddrinfo(long threadnum, char *host, int port, const char **errstr)
101{
102	char portstr[6], hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
103	struct addrinfo hints, *res;
104	int error;
105
106	snprintf(portstr, sizeof(portstr), "%d", port);
107	memset(&hints, 0, sizeof(hints));
108	hints.ai_family = AF_UNSPEC;
109	hints.ai_flags = AI_PASSIVE;
110	hints.ai_socktype = SOCK_STREAM;
111	error = getaddrinfo(host, portstr, &hints, &res);
112	if (error == 0) {
113		DBG("T%ld: host %s ok\n", threadnum, host);
114		memset(hbuf, 0, sizeof(hbuf));
115		memset(pbuf, 0, sizeof(pbuf));
116		getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
117		    pbuf, sizeof(pbuf), 0);
118		DBG("T%ld: reverse %s %s\n", threadnum, hbuf, pbuf);
119		freeaddrinfo(res);
120	} else {
121		*errstr = gai_strerror(error);
122		DBG("T%ld: host %s not found: %s\n", threadnum, host, *errstr);
123	}
124	return error;
125}
126
127static int
128resolv_gethostby(long threadnum, char *host, const char **errstr)
129{
130	char buf[1024];
131	struct hostent *hp, *hp2;
132
133	hp = gethostbyname(host);
134	if (hp) {
135		DBG("T%ld: host %s ok\n", threadnum, host);
136		memcpy(buf, hp->h_addr, hp->h_length);
137		hp2 = gethostbyaddr(buf, hp->h_length, hp->h_addrtype);
138		if (hp2) {
139			DBG("T%ld: reverse %s\n", threadnum, hp2->h_name);
140		}
141	} else {
142		*errstr = hstrerror(h_errno);
143		DBG("T%ld: host %s not found: %s\n", threadnum, host, *errstr);
144	}
145	return hp ? 0 : h_errno;
146}
147
148static int
149resolv_getipnodeby(long threadnum, char *host, const char **errstr)
150{
151	char buf[1024];
152	struct hostent *hp, *hp2;
153	int error = 0;
154
155	hp = getipnodebyname(host, AF_INET, 0, &error);
156	if (hp) {
157		DBG("T%ld: host %s ok\n", threadnum, host);
158		memcpy(buf, hp->h_addr, hp->h_length);
159		hp2 = getipnodebyaddr(buf, hp->h_length, hp->h_addrtype,
160		    &error);
161		if (hp2) {
162			DBG("T%ld: reverse %s\n", threadnum, hp2->h_name);
163			freehostent(hp2);
164		}
165		freehostent(hp);
166	} else {
167		*errstr = hstrerror(error);
168		DBG("T%ld: host %s not found: %s\n", threadnum, host, *errstr);
169	}
170	return hp ? 0 : error;
171}
172
173static void
174resolvone(long threadnum, int n, enum method method)
175{
176	const char* errstr = NULL;
177	size_t i = (random() & 0x0fffffff) % hosts->sl_cur;
178	char *host = hosts->sl_str[i];
179	int error;
180
181	DBG("T%ld: %d resolving %s %zd\n", threadnum, n, host, i);
182	switch (method) {
183	case METHOD_GETADDRINFO:
184		error = resolv_getaddrinfo(threadnum, host, i, &errstr);
185		break;
186	case METHOD_GETHOSTBY:
187		error = resolv_gethostby(threadnum, host, &errstr);
188		break;
189	case METHOD_GETIPNODEBY:
190		error = resolv_getipnodeby(threadnum, host, &errstr);
191		break;
192	default:
193		/* UNREACHABLE */
194		/* XXX Needs an __assert_unreachable() for userland. */
195		assert(0 && "Unreachable segment reached");
196		abort();
197		break;
198	}
199	atomic_fetch_add_explicit(&ask[i], 1, memory_order_relaxed);
200	if (error == 0)
201		atomic_fetch_add_explicit(&got[i], 1, memory_order_relaxed);
202	else if (got[i] != 0)
203		fprintf(stderr,
204		    "T%ld ERROR after previous success for %s: %d (%s)\n",
205		    threadnum, hosts->sl_str[i], error, errstr);
206}
207
208struct resolvloop_args {
209	int nhosts;
210	enum method method;
211	long threadnum;
212};
213
214static void *
215resolvloop(void *p)
216{
217	struct resolvloop_args *args = p;
218	int nhosts = args->nhosts;
219
220	if (nhosts == 0) {
221		free(args);
222		return NULL;
223	}
224
225	do {
226		resolvone(args->threadnum, nhosts, args->method);
227	} while (--nhosts);
228	free(args);
229	return (void *)(uintptr_t)nhosts;
230}
231
232static pthread_t
233run(int nhosts, enum method method, long i)
234{
235	pthread_t t;
236	int rc;
237	struct resolvloop_args *args;
238
239	/* Created thread is responsible for free(). */
240	args = malloc(sizeof(*args));
241	ATF_REQUIRE(args != NULL);
242
243	args->nhosts = nhosts;
244	args->method = method;
245	args->threadnum = i + 1;
246	rc = pthread_create(&t, NULL, resolvloop, args);
247	ATF_REQUIRE_MSG(rc == 0, "pthread_create failed: %s", strerror(rc));
248	return t;
249}
250
251static int
252run_tests(const char *hostlist_file, enum method method)
253{
254	size_t nthreads = NTHREADS;
255	pthread_t *threads;
256	size_t nhosts = NHOSTS;
257	size_t i;
258	int c;
259	hosts = sl_init();
260
261	srandom(1234);
262	debug_output = getenv("DEBUG_OUTPUT") != NULL;
263
264	load(hostlist_file);
265
266	ATF_REQUIRE_MSG(0 < hosts->sl_cur, "0 hosts in %s", hostlist_file);
267
268	ask = calloc(hosts->sl_cur, sizeof(int));
269	ATF_REQUIRE(ask != NULL);
270
271	got = calloc(hosts->sl_cur, sizeof(int));
272	ATF_REQUIRE(got != NULL);
273
274	threads = calloc(nthreads, sizeof(pthread_t));
275	ATF_REQUIRE(threads != NULL);
276
277	for (i = 0; i < nthreads; i++) {
278		threads[i] = run(nhosts, method, i);
279	}
280	/* Wait for all threads to join and check that they checked all hosts */
281	for (i = 0; i < nthreads; i++) {
282		size_t remaining;
283
284		remaining = (uintptr_t)pthread_join(threads[i], NULL);
285		ATF_CHECK_EQ_MSG(0, remaining,
286		    "Thread %zd still had %zd hosts to check!", i, remaining);
287	}
288
289	c = 0;
290	for (i = 0; i < hosts->sl_cur; i++) {
291		if (got[i] != 0) {
292			ATF_CHECK_EQ_MSG(ask[i], got[i],
293			    "Error: host %s ask %d got %d", hosts->sl_str[i],
294			    ask[i], got[i]);
295			c += ask[i] != got[i];
296		}
297	}
298	free(threads);
299	free(ask);
300	free(got);
301	sl_free(hosts, 1);
302	return c;
303}
304
305#define	HOSTLIST_FILE	"mach"
306
307#define	RUN_TESTS(tc, method) \
308do {									\
309	char *_hostlist_file;						\
310	ATF_REQUIRE(0 < asprintf(&_hostlist_file, "%s/%s",		\
311	    atf_tc_get_config_var(tc, "srcdir"), HOSTLIST_FILE));	\
312	ATF_REQUIRE(run_tests(_hostlist_file, method) == 0);		\
313} while(0)
314
315ATF_TC(getaddrinfo_test);
316ATF_TC_HEAD(getaddrinfo_test, tc) {
317	atf_tc_set_md_var(tc, "timeout", "1200");
318}
319ATF_TC_BODY(getaddrinfo_test, tc)
320{
321
322	RUN_TESTS(tc, METHOD_GETADDRINFO);
323}
324
325ATF_TC(gethostby_test);
326ATF_TC_HEAD(gethostby_test, tc) {
327	atf_tc_set_md_var(tc, "timeout", "1200");
328}
329ATF_TC_BODY(gethostby_test, tc)
330{
331
332	RUN_TESTS(tc, METHOD_GETHOSTBY);
333}
334
335ATF_TC(getipnodeby_test);
336ATF_TC_HEAD(getipnodeby_test, tc) {
337
338	atf_tc_set_md_var(tc, "timeout", "1200");
339}
340ATF_TC_BODY(getipnodeby_test, tc)
341{
342
343	RUN_TESTS(tc, METHOD_GETIPNODEBY);
344}
345
346ATF_TP_ADD_TCS(tp)
347{
348
349	ATF_TP_ADD_TC(tp, getaddrinfo_test);
350	ATF_TP_ADD_TC(tp, gethostby_test);
351	ATF_TP_ADD_TC(tp, getipnodeby_test);
352
353	return (atf_no_error());
354}
355