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/* $FreeBSD$ */
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: resolv.c,v 1.6 2004/05/23 16:59:11 christos Exp $");
34
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <assert.h>
38#include <errno.h>
39#include <pthread.h>
40#include <stdio.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 int *ask = NULL;
61static int *got = NULL;
62
63static void load(const char *);
64static void resolvone(int, enum method);
65static void *resolvloop(void *);
66static void run(int *, enum method);
67
68static pthread_mutex_t stats = PTHREAD_MUTEX_INITIALIZER;
69
70static void
71load(const char *fname)
72{
73	FILE *fp;
74	size_t len;
75	char *line;
76
77	if ((fp = fopen(fname, "r")) == NULL)
78	ATF_REQUIRE(fp != NULL);
79	while ((line = fgetln(fp, &len)) != NULL) {
80		char c = line[len - 1];
81		char *ptr;
82		line[len - 1] = '\0';
83		for (ptr = strtok(line, WS); ptr; ptr = strtok(NULL, WS)) {
84			if (ptr == '\0' || ptr[0] == '#')
85				continue;
86			sl_add(hosts, strdup(ptr));
87		}
88		line[len - 1] = c;
89	}
90
91	(void)fclose(fp);
92}
93
94static int
95resolv_getaddrinfo(pthread_t self, char *host, int port)
96{
97	char portstr[6], buf[1024], hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
98	struct addrinfo hints, *res;
99	int error, len;
100
101	snprintf(portstr, sizeof(portstr), "%d", port);
102	memset(&hints, 0, sizeof(hints));
103	hints.ai_family = AF_UNSPEC;
104	hints.ai_flags = AI_PASSIVE;
105	hints.ai_socktype = SOCK_STREAM;
106	error = getaddrinfo(host, portstr, &hints, &res);
107	len = snprintf(buf, sizeof(buf), "%p: host %s %s\n",
108	    self, host, error ? "not found" : "ok");
109	(void)write(STDOUT_FILENO, buf, len);
110	if (error == 0) {
111		memset(hbuf, 0, sizeof(hbuf));
112		memset(pbuf, 0, sizeof(pbuf));
113		getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
114			    pbuf, sizeof(pbuf), 0);
115		len = snprintf(buf, sizeof(buf),
116		    "%p: reverse %s %s\n", self, hbuf, pbuf);
117		(void)write(STDOUT_FILENO, buf, len);
118	}
119	if (error == 0)
120		freeaddrinfo(res);
121	return error;
122}
123
124static int
125resolv_gethostby(pthread_t self, char *host)
126{
127	char buf[1024];
128	struct hostent *hp, *hp2;
129	int len;
130
131	hp = gethostbyname(host);
132	len = snprintf(buf, sizeof(buf), "%p: host %s %s\n",
133	    self, host, (hp == NULL) ? "not found" : "ok");
134	(void)write(STDOUT_FILENO, buf, len);
135	if (hp) {
136		memcpy(buf, hp->h_addr, hp->h_length);
137		hp2 = gethostbyaddr(buf, hp->h_length, hp->h_addrtype);
138		if (hp2) {
139			len = snprintf(buf, sizeof(buf),
140			    "%p: reverse %s\n", self, hp2->h_name);
141			(void)write(STDOUT_FILENO, buf, len);
142		}
143	}
144	return hp ? 0 : -1;
145}
146
147static int
148resolv_getipnodeby(pthread_t self, char *host)
149{
150	char buf[1024];
151	struct hostent *hp, *hp2;
152	int len, h_error;
153
154	hp = getipnodebyname(host, AF_INET, 0, &h_error);
155	len = snprintf(buf, sizeof(buf), "%p: host %s %s\n",
156	    self, host, (hp == NULL) ? "not found" : "ok");
157	(void)write(STDOUT_FILENO, buf, len);
158	if (hp) {
159		memcpy(buf, hp->h_addr, hp->h_length);
160		hp2 = getipnodebyaddr(buf, hp->h_length, hp->h_addrtype,
161		    &h_error);
162		if (hp2) {
163			len = snprintf(buf, sizeof(buf),
164			    "%p: reverse %s\n", self, hp2->h_name);
165			(void)write(STDOUT_FILENO, buf, len);
166		}
167		if (hp2)
168			freehostent(hp2);
169	}
170	if (hp)
171		freehostent(hp);
172	return hp ? 0 : -1;
173}
174
175static void
176resolvone(int n, enum method method)
177{
178	char buf[1024];
179	pthread_t self = pthread_self();
180	size_t i = (random() & 0x0fffffff) % hosts->sl_cur;
181	char *host = hosts->sl_str[i];
182	int error, len;
183
184	len = snprintf(buf, sizeof(buf), "%p: %d resolving %s %d\n",
185	    self, n, host, (int)i);
186	(void)write(STDOUT_FILENO, buf, len);
187	error = 0;
188	switch (method) {
189	case METHOD_GETADDRINFO:
190		error = resolv_getaddrinfo(self, host, i);
191		break;
192	case METHOD_GETHOSTBY:
193		error = resolv_gethostby(self, host);
194		break;
195	case METHOD_GETIPNODEBY:
196		error = resolv_getipnodeby(self, host);
197		break;
198	default:
199		/* UNREACHABLE */
200		/* XXX Needs an __assert_unreachable() for userland. */
201		assert(0 && "Unreachable segment reached");
202		abort();
203		break;
204	}
205	pthread_mutex_lock(&stats);
206	ask[i]++;
207	got[i] += error == 0;
208	pthread_mutex_unlock(&stats);
209}
210
211struct resolvloop_args {
212	int *nhosts;
213	enum method method;
214};
215
216static void *
217resolvloop(void *p)
218{
219	struct resolvloop_args *args = p;
220
221	if (*args->nhosts == 0) {
222		free(args);
223		return NULL;
224	}
225
226	do
227		resolvone(*args->nhosts, args->method);
228	while (--(*args->nhosts));
229	free(args);
230	return NULL;
231}
232
233static void
234run(int *nhosts, enum method method)
235{
236	pthread_t self;
237	int rc;
238	struct resolvloop_args *args;
239
240	/* Created thread is responsible for free(). */
241	args = malloc(sizeof(*args));
242	ATF_REQUIRE(args != NULL);
243
244	args->nhosts = nhosts;
245	args->method = method;
246	self = pthread_self();
247	rc = pthread_create(&self, NULL, resolvloop, args);
248	ATF_REQUIRE_MSG(rc == 0, "pthread_create failed: %s", strerror(rc));
249}
250
251static int
252run_tests(const char *hostlist_file, enum method method)
253{
254	size_t nthreads = NTHREADS;
255	size_t nhosts = NHOSTS;
256	size_t i;
257	int c, done, *nleft;
258	hosts = sl_init();
259
260	srandom(1234);
261
262	load(hostlist_file);
263
264	ATF_REQUIRE_MSG(0 < hosts->sl_cur, "0 hosts in %s", hostlist_file);
265
266	nleft = malloc(nthreads * sizeof(int));
267	ATF_REQUIRE(nleft != NULL);
268
269	ask = calloc(hosts->sl_cur, sizeof(int));
270	ATF_REQUIRE(ask != NULL);
271
272	got = calloc(hosts->sl_cur, sizeof(int));
273	ATF_REQUIRE(got != NULL);
274
275	for (i = 0; i < nthreads; i++) {
276		nleft[i] = nhosts;
277		run(&nleft[i], method);
278	}
279
280	for (done = 0; !done;) {
281		done = 1;
282		for (i = 0; i < nthreads; i++) {
283			if (nleft[i] != 0) {
284				done = 0;
285				break;
286			}
287		}
288		sleep(1);
289	}
290	c = 0;
291	for (i = 0; i < hosts->sl_cur; i++) {
292		if (ask[i] != got[i] && got[i] != 0) {
293			printf("Error: host %s ask %d got %d\n",
294			    hosts->sl_str[i], ask[i], got[i]);
295			c++;
296		}
297	}
298	free(nleft);
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