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 /*
30  * Back end to a variety of TCP-related benchmarks.  This program accepts TCP
31  * connections on a port, and echoes all received data back to the sender.
32  * It is capable of handling only one connection at a time out of a single
33  * thread.
34  */
35 #include <sys/types.h>
36 #include <sys/socket.h>
37 
38 #include <netinet/in.h>
39 
40 #include <arpa/inet.h>
41 
42 #include <err.h>
43 #include <stdlib.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, and uses a fixed maximum
51  * buffer size.  It makes no attempt to time out old connections.
52  */
53 #define	BUFFERSIZE	128*1024
54 #define	PORT		6060
55 
56 static void
57 handle_connection(int accept_sock)
58 {
59 	u_char buffer[BUFFERSIZE];
60 	ssize_t len, recvlen, sofar;
61 	int s;
62 
63 	s = accept(accept_sock, NULL, NULL);
64 	if (s < 0) {
65 		warn("accept");
66 		return;
67 	}
68 
69 	while (1) {
70 		recvlen = recv(s, buffer, BUFFERSIZE, 0);
71 		if (recvlen < 0 || recvlen == 0) {
72 			close(s);
73 			return;
74 		}
75 		sofar = 0;
76 		while (sofar < recvlen) {
77 			len = send(s, buffer + sofar, recvlen - sofar, 0);
78 			if (len < 0) {
79 				close(s);
80 				return;
81 			}
82 			sofar += len;
83 		}
84 	}
85 }
86 
87 int
88 main(int argc, char *argv[])
89 {
90 	struct sockaddr_in sin;
91 	int accept_sock;
92 
93 	accept_sock = socket(PF_INET, SOCK_STREAM, 0);
94 	if (accept_sock < 0)
95 		err(-1, "socket(PF_INET, SOCKET_STREAM, 0)");
96 
97 	bzero(&sin, sizeof(sin));
98 	sin.sin_family = AF_INET;
99 	sin.sin_len = sizeof(sin);
100 	sin.sin_addr.s_addr = INADDR_ANY;
101 	sin.sin_port = htons(PORT);
102 
103 	if (bind(accept_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
104 		err(-1, "bind");
105 
106 	if (listen(accept_sock, -1) < 0)
107 		err(-1, "listen");
108 
109 	while (1)
110 		handle_connection(accept_sock);
111 
112 	return (0);
113 }
114