udp_dontroute.c revision 263445 
1/*
2 *  Copyright (c) 2014 Spectra Logic Corporation
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: Alan Somers         (Spectra Logic Corporation)
31 *
32 * $FreeBSD: head/tests/sys/netinet/udp_dontroute.c 263445 2014-03-20 20:39:41Z asomers $
33 */
34
35#include <arpa/inet.h>
36#include <netinet/in.h>
37#include <sys/types.h>
38#include <sys/socket.h>
39
40#include <err.h>
41#include <errno.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45
46/*
47 * Sends a single UDP packet to the provided address, with SO_DONTROUTE set
48 * I couldn't find a way to do this with builtin utilities like nc(1)
49 */
50int main(int argc, char **argv)
51{
52	struct sockaddr_in dst;
53	int s;
54	int opt;
55	int ret;
56	const char* buf = "Hello, World!";
57
58	if (argc != 2) {
59		fprintf(stderr, "Usage: %s ip_address\n", argv[0]);
60		exit(2);
61	}
62	s = socket(PF_INET, SOCK_DGRAM, 0);
63	if (s < 0)
64		err(errno, "socket");
65	opt = 1;
66
67	ret = setsockopt(s, SOL_SOCKET, SO_DONTROUTE, &opt, sizeof(opt));
68	if (ret == -1)
69		err(errno, "setsockopt(SO_DONTROUTE)");
70
71	dst.sin_len = sizeof(dst);
72	dst.sin_family = AF_INET;
73	dst.sin_port = htons(46120);
74	dst.sin_addr.s_addr = inet_addr(argv[1]);
75	if (dst.sin_addr.s_addr == htonl(INADDR_NONE)) {
76		fprintf(stderr, "Invalid address: %s\n", argv[1]);
77		exit(2);
78	}
79	ret = sendto(s, buf, strlen(buf), 0, (struct sockaddr*)&dst,
80	    dst.sin_len);
81	if (ret == -1)
82		err(errno, "sendto");
83
84	return (0);
85}
86