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 */
53 int
main(int argc,char ** argv)54 main(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