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: stable/12/tools/tools/netrate/tcpreceive/tcpreceive.c 150970 2005-10-05 12:10:35Z rwatson $
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
handle_connection(int accept_sock)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
main(int argc,char * argv[])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