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 /*
28  * Back end to a variety of TCP-related benchmarks.  This program accepts TCP
29  * connections on a port, and echoes all received data back to the sender.
30  * It is capable of handling only one connection at a time out of a single
31  * thread.
32  */
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 
36 #include <netinet/in.h>
37 
38 #include <arpa/inet.h>
39 
40 #include <err.h>
41 #include <stdlib.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, and uses a fixed maximum
49  * buffer size.  It makes no attempt to time out old connections.
50  */
51 #define	BUFFERSIZE	128*1024
52 #define	PORT		6060
53 
54 static void
55 handle_connection(int accept_sock)
56 {
57 	u_char buffer[BUFFERSIZE];
58 	ssize_t len, recvlen, sofar;
59 	int s;
60 
61 	s = accept(accept_sock, NULL, NULL);
62 	if (s < 0) {
63 		warn("accept");
64 		return;
65 	}
66 
67 	while (1) {
68 		recvlen = recv(s, buffer, BUFFERSIZE, 0);
69 		if (recvlen < 0 || recvlen == 0) {
70 			close(s);
71 			return;
72 		}
73 		sofar = 0;
74 		while (sofar < recvlen) {
75 			len = send(s, buffer + sofar, recvlen - sofar, 0);
76 			if (len < 0) {
77 				close(s);
78 				return;
79 			}
80 			sofar += len;
81 		}
82 	}
83 }
84 
85 int
86 main(int argc, char *argv[])
87 {
88 	struct sockaddr_in sin;
89 	int accept_sock;
90 
91 	accept_sock = socket(PF_INET, SOCK_STREAM, 0);
92 	if (accept_sock < 0)
93 		err(-1, "socket(PF_INET, SOCKET_STREAM, 0)");
94 
95 	bzero(&sin, sizeof(sin));
96 	sin.sin_family = AF_INET;
97 	sin.sin_len = sizeof(sin);
98 	sin.sin_addr.s_addr = INADDR_ANY;
99 	sin.sin_port = htons(PORT);
100 
101 	if (bind(accept_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
102 		err(-1, "bind");
103 
104 	if (listen(accept_sock, -1) < 0)
105 		err(-1, "listen");
106 
107 	while (1)
108 		handle_connection(accept_sock);
109 
110 	return (0);
111 }
112