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
27 #include <sys/types.h>
28 #include <sys/fcntl.h>
29 #include <sys/ioctl.h>
30 #include <sys/select.h>
31 #include <sys/socket.h>
32 #include <sys/stdint.h>
33
34 #include <netinet/in.h>
35
36 #include <arpa/inet.h>
37
38 #include <err.h>
39 #include <errno.h>
40 #include <signal.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 /*
46 * Simple micro-benchmark to see how many connections/second can be created
47 * in a serialized fashion against a given server. A timer signal is used
48 * to interrupt the loop and assess the cost.
49 */
50 #define SECONDS 60
51 #define PORT 6060
52
53 static int timer_fired;
54
55 /*
56 * Signal timer, which both interrupts the in-progress socket operation, and
57 * flags the timer as having fired so the main loop can exit.
58 */
59 static void
alarm_handler(__unused int signum)60 alarm_handler(__unused int signum)
61 {
62
63 timer_fired = 1;
64 }
65
66 /*
67 * Build a connection. In order to make sure the signal interrupts us as
68 * we wait, use non-blocking sockets and select(). Return 0 on success, or
69 * -1 if we were interrupted. Exit with a failure if we get an unspected
70 * error.
71 */
72 static int
try_connect(struct sockaddr_in * sin)73 try_connect(struct sockaddr_in *sin)
74 {
75 struct
76 fd_set read_set;
77 int i, s;
78
79 s = socket(PF_INET, SOCK_STREAM, 0);
80 if (s < 0)
81 err(-1, "socket(PF_INET, SOCK_STREAM)");
82
83 i = 1;
84 if (fcntl(s, F_SETFL, FIONBIO, &i) < 0)
85 err(-1, "fcntl(s, FIOBIO, 1)");
86
87 FD_ZERO(&read_set);
88 FD_SET(s, &read_set);
89
90 if (connect(s, (struct sockaddr *)sin, sizeof(*sin)) < 0 &&
91 errno != EINPROGRESS)
92 err(-1, "connect(%s)", inet_ntoa(sin->sin_addr));
93
94 if (select(s + 1, &read_set, &read_set, &read_set, NULL) < 0) {
95 if ((errno == EINTR && !timer_fired) || (errno != EINTR))
96 err(-1, "select");
97 return (-1);
98 }
99
100 close(s);
101 return (0);
102 }
103
104
105 int
main(int argc,char * argv[])106 main(int argc, char *argv[])
107 {
108 struct sockaddr_in sin;
109 u_int64_t counter;
110
111 if (argc != 2)
112 errx(-1, "usage: tcpconnect [ip]");
113
114 bzero(&sin, sizeof(sin));
115 sin.sin_family = AF_INET;
116 sin.sin_len = sizeof(sin);
117 sin.sin_addr.s_addr = inet_addr(argv[1]);
118 sin.sin_port = htons(PORT);
119
120 if (signal(SIGALRM, alarm_handler) == SIG_ERR)
121 err(-1, "signal(SIGALRM)");
122
123 alarm(SECONDS);
124
125 counter = 0;
126 while (!timer_fired) {
127 if (try_connect(&sin) == 0)
128 counter++;
129 }
130 printf("%ju count\n", (uintmax_t)counter);
131 printf("%ju connections/second\n", (uintmax_t)(counter / SECONDS));
132
133 return (0);
134 }
135