1/*-
2 * Copyright (c) 2005 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <sys/types.h>
30#include <sys/fcntl.h>
31#include <sys/ioctl.h>
32#include <sys/select.h>
33#include <sys/socket.h>
34#include <sys/stdint.h>
35
36#include <netinet/in.h>
37
38#include <arpa/inet.h>
39
40#include <err.h>
41#include <errno.h>
42#include <signal.h>
43#include <stdio.h>
44#include <string.h>
45#include <unistd.h>
46
47/*
48 * Simple micro-benchmark to see how many connections/second can be created
49 * in a serialized fashion against a given server.  A timer signal is used
50 * to interrupt the loop and assess the cost.
51 */
52#define	SECONDS	60
53#define	PORT	6060
54
55static int	timer_fired;
56
57/*
58 * Signal timer, which both interrupts the in-progress socket operation, and
59 * flags the timer as having fired so the main loop can exit.
60 */
61static void
62alarm_handler(__unused int signum)
63{
64
65	timer_fired = 1;
66}
67
68/*
69 * Build a connection.  In order to make sure the signal interrupts us as
70 * we wait, use non-blocking sockets and select().  Return 0 on success, or
71 * -1 if we were interrupted.  Exit with a failure if we get an unspected
72 * error.
73 */
74static int
75try_connect(struct sockaddr_in *sin)
76{
77	struct
78	fd_set read_set;
79	int i, s;
80
81	s = socket(PF_INET, SOCK_STREAM, 0);
82	if (s < 0)
83		err(-1, "socket(PF_INET, SOCK_STREAM)");
84
85	i = 1;
86	if (fcntl(s, F_SETFL, FIONBIO, &i) < 0)
87		err(-1, "fcntl(s, FIOBIO, 1)");
88
89	FD_ZERO(&read_set);
90	FD_SET(s, &read_set);
91
92	if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 &&
93	    errno != EINPROGRESS)
94		err(-1, "connect(%s)", inet_ntoa(sin->sin_addr));
95
96	if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) {
97		if ((errno == EINTR && !timer_fired) || (errno != EINTR))
98			err(-1, "select");
99		return (-1);
100	}
101
102	close(s);
103	return (0);
104}
105
106
107int
108main(int argc, char *argv[])
109{
110	struct sockaddr_in sin;
111	u_int64_t counter;
112
113	if (argc != 2)
114		errx(-1, "usage: tcpconnect [ip]");
115
116	bzero(&sin, sizeof(sin));
117	sin.sin_family = AF_INET;
118	sin.sin_len = sizeof(sin);
119	sin.sin_addr.s_addr = inet_addr(argv[1]);
120	sin.sin_port = htons(PORT);
121
122	if (signal(SIGALRM, alarm_handler) == SIG_ERR)
123		err(-1, "signal(SIGALRM)");
124
125	alarm(SECONDS);
126
127	counter = 0;
128	while (!timer_fired) {
129		if (try_connect(&sin) == 0)
130			counter++;
131	}
132	printf("%ju count\n", (uintmax_t)counter);
133	printf("%ju connections/second\n", (uintmax_t)(counter / SECONDS));
134
135	return (0);
136}
137