resolv_test.c revision 145857 
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38#include <sys/cdefs.h>
39__RCSID("$NetBSD: resolv.c,v 1.6 2004/05/23 16:59:11 christos Exp $");
40
41#include <pthread.h>
42#include <stdio.h>
43#include <netdb.h>
44#include <stdlib.h>
45#include <unistd.h>
46#include <err.h>
47#include <string.h>
48#include <stringlist.h>
49
50#define NTHREADS	10
51#define NHOSTS		100
52#define WS		" \t\n\r"
53
54static StringList *hosts = NULL;
55static int debug = 0;
56static int *ask = NULL;
57static int *got = NULL;
58
59static void usage(void)  __attribute__((__noreturn__));
60static void load(const char *);
61static void resolvone(int);
62static void *resolvloop(void *);
63static void run(int *);
64
65static pthread_mutex_t stats = PTHREAD_MUTEX_INITIALIZER;
66
67static void
68usage(void)
69{
70	(void)fprintf(stderr,
71	    "Usage: %s [-d] [-h <nhosts>] [-n <nthreads>] <file> ...\n",
72	    getprogname());
73	exit(1);
74}
75
76static void
77load(const char *fname)
78{
79	FILE *fp;
80	size_t len;
81	char *line;
82
83	if ((fp = fopen(fname, "r")) == NULL)
84		err(1, "Cannot open `%s'", fname);
85	while ((line = fgetln(fp, &len)) != NULL) {
86		char c = line[len];
87		char *ptr;
88		line[len] = '\0';
89		for (ptr = strtok(line, WS); ptr; ptr = strtok(NULL, WS))
90			sl_add(hosts, strdup(ptr));
91		line[len] = c;
92	}
93
94	(void)fclose(fp);
95}
96
97static void
98resolvone(int n)
99{
100	char buf[1024];
101	pthread_t self = pthread_self();
102	size_t i = (random() & 0x0fffffff) % hosts->sl_cur;
103	char *host = hosts->sl_str[i];
104	struct addrinfo *res;
105	int error, len;
106	if (debug) {
107		len = snprintf(buf, sizeof(buf), "%p: %d resolving %s %d\n",
108		    self, n, host, (int)i);
109		(void)write(STDOUT_FILENO, buf, len);
110	}
111	error = getaddrinfo(host, NULL, NULL, &res);
112	if (debug) {
113		len = snprintf(buf, sizeof(buf), "%p: host %s %s\n",
114		    self, host, error ? "not found" : "ok");
115		(void)write(STDOUT_FILENO, buf, len);
116	}
117	pthread_mutex_lock(&stats);
118	ask[i]++;
119	got[i] += error == 0;
120	pthread_mutex_unlock(&stats);
121	if (error == 0)
122		freeaddrinfo(res);
123}
124
125static void *
126resolvloop(void *p)
127{
128	int *nhosts = (int *)p;
129	if (*nhosts == 0)
130		return;
131	do
132		resolvone(*nhosts);
133	while (--(*nhosts));
134	return NULL;
135}
136
137static void
138run(int *nhosts)
139{
140	pthread_t self = pthread_self();
141	if (pthread_create(&self, NULL, resolvloop, nhosts) != 0)
142		err(1, "pthread_create");
143}
144
145int
146main(int argc, char *argv[])
147{
148	int nthreads = NTHREADS;
149	int nhosts = NHOSTS;
150	int i, c, done, *nleft;
151	hosts = sl_init();
152
153	srandom(1234);
154
155	while ((c = getopt(argc, argv, "dh:n:")) != -1)
156		switch (c) {
157		case 'd':
158			debug++;
159			break;
160		case 'h':
161			nhosts = atoi(optarg);
162			break;
163		case 'n':
164			nthreads = atoi(optarg);
165			break;
166		default:
167			usage();
168		}
169
170	for (i = optind; i < argc; i++)
171		load(argv[i]);
172
173	if (hosts->sl_cur == 0)
174		usage();
175
176	if ((nleft = malloc(nthreads * sizeof(int))) == NULL)
177		err(1, "malloc");
178	if ((ask = calloc(hosts->sl_cur, sizeof(int))) == NULL)
179		err(1, "calloc");
180	if ((got = calloc(hosts->sl_cur, sizeof(int))) == NULL)
181		err(1, "calloc");
182
183
184	for (i = 0; i < nthreads; i++) {
185		nleft[i] = nhosts;
186		run(&nleft[i]);
187	}
188
189	for (done = 0; !done;) {
190		done = 1;
191		for (i = 0; i < nthreads; i++) {
192			if (nleft[i] != 0) {
193				done = 0;
194				break;
195			}
196		}
197		sleep(1);
198	}
199	c = 0;
200	for (i = 0; i < hosts->sl_cur; i++) {
201		if (ask[i] != got[i] && got[i] != 0) {
202			warnx("Error: host %s ask %d got %d\n",
203			    hosts->sl_str[i], ask[i], got[i]);
204			c++;
205		}
206	}
207	free(nleft);
208	free(ask);
209	free(got);
210	sl_free(hosts, 1);
211	return c;
212}
213