1/*-
2 * Copyright (c) 2004 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 * $FreeBSD$
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <sys/time.h>
32
33#include <netinet/in.h>
34
35#include <arpa/inet.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41static void
42usage(void)
43{
44
45	fprintf(stderr, "netreceive [port]\n");
46	exit(-1);
47}
48
49int
50main(int argc, char *argv[])
51{
52	struct sockaddr_in sin;
53	char *dummy, *packet;
54	long port;
55	int s, v;
56
57	if (argc != 2)
58		usage();
59
60	bzero(&sin, sizeof(sin));
61	sin.sin_len = sizeof(sin);
62	sin.sin_family = AF_INET;
63	sin.sin_addr.s_addr = htonl(INADDR_ANY);
64
65	port = strtoul(argv[1], &dummy, 10);
66	if (port < 1 || port > 65535 || *dummy != '\0')
67		usage();
68	sin.sin_port = htons(port);
69
70	packet = malloc(65536);
71	if (packet == NULL) {
72		perror("malloc");
73		return (-1);
74	}
75	bzero(packet, 65536);
76
77	s = socket(PF_INET, SOCK_DGRAM, 0);
78	if (s == -1) {
79		perror("socket");
80		return (-1);
81	}
82
83	v = 128 * 1024;
84	if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &v, sizeof(v)) < 0) {
85		perror("SO_RCVBUF");
86		return (-1);
87	}
88
89	if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
90		perror("bind");
91		return (-1);
92	}
93
94	printf("netreceive listening on UDP port %d\n", (u_short)port);
95
96	while (1) {
97		if (recv(s, packet, 65536, 0) < 0)
98			perror("recv");
99	}
100}
101