1/*
2 *  Copyright (c) 2016 Limelight Networks
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 *     without modification.
11 *  2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *     substantially similar to the "NO WARRANTY" disclaimer below
13 *     ("Disclaimer") and any redistribution must be conditioned upon
14 *     including a substantially similar Disclaimer requirement for further
15 *     binary redistribution.
16 *
17 *  NO WARRANTY
18 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
21 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 *  HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 *  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 *  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 *  POSSIBILITY OF SUCH DAMAGES.
29 *
30 *  Authors: George Neville-Neil
31 */
32
33#include <arpa/inet.h>
34#include <netinet/in.h>
35#include <sys/types.h>
36#include <sys/socket.h>
37
38#include <err.h>
39#include <sysexits.h>
40#include <errno.h>
41#include <fcntl.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47#define buflen 80
48
49/*
50 * Setup a TCP server listening on a port for connections, all of
51 * which subseuqently have their user cookie set.
52 */
53int
54main(int argc, char **argv)
55{
56	struct sockaddr_in srv;
57	int sock, accepted, port, cookie;
58	int ret;
59	char recvbuf[buflen];
60
61	if (argc != 3) {
62		fprintf(stderr, "Usage: %s port cookie\n", argv[0]);
63		exit(2);
64	}
65
66	port = atoi(argv[1]);
67	cookie = atoi(argv[2]);
68
69	sock = socket(PF_INET, SOCK_STREAM, 0);
70	if (sock < 0)
71		err(EXIT_FAILURE, "socket");
72
73	memset(&srv, 0, sizeof(srv));
74	srv.sin_len = sizeof(srv);
75	srv.sin_family = AF_INET;
76	srv.sin_port = htons(port);
77	srv.sin_addr.s_addr = INADDR_ANY;
78
79	if (bind(sock, (struct sockaddr *)&srv, srv.sin_len) < 0)
80		err(EX_OSERR, "failed to bind to port %d", port);
81
82	if (listen(sock, 5) < 0)
83		err(EX_OSERR, "failed to listen on socket");
84
85	ret = setsockopt(sock, SOL_SOCKET, SO_USER_COOKIE, &cookie, sizeof(cookie));
86	if (ret < 0)
87		err(EX_OSERR, "setsockopt(SO_USER_COOKIE)");
88
89	while (1) {
90
91		accepted = accept(sock, NULL, 0);
92
93		if (accepted < 0)
94			err(EX_OSERR, "accept failed");
95
96		ret = setsockopt(accepted, SOL_SOCKET, SO_USER_COOKIE,
97				 &cookie, sizeof(cookie));
98		if (ret < 0)
99			err(EX_OSERR, "setsockopt(SO_USER_COOKIE)");
100
101		ret = read(accepted, &recvbuf, buflen);
102
103		if (ret < 0)
104			warn("failed read");
105
106		close(accepted);
107	}
108
109	return (0);
110}
111