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main.c
ae (Andrey V. Elsukov)
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ae
Feb 9 2021, 2:23 PM
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main.c
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021 Yandex LLC
* Copyright (c) 2021 Andrey V. Elsukov <ae@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/socket.h>
#include <err.h>
#include <fcntl.h>
#include <sysexits.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
const unsigned short port = 54321;
const char *maddr = "ff02::210";
const char *ifname = "vlan500";
static int
setup_socket(void)
{
struct sockaddr_in6 sin6;
struct ipv6_mreq mreq6;
int ifx, s;
ifx = if_nametoindex(ifname);
if (ifx == 0)
errx(EX_USAGE, "Interface %s is not found", ifname);
s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1)
err(EX_OSERR, "socket()");
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(sin6);
sin6.sin6_port = htons(port);
if (bind(s, (struct sockaddr *)&sin6, sizeof(sin6)) == -1)
err(EX_OSERR, "bind()");
memset(&mreq6, 0, sizeof(mreq6));
mreq6.ipv6mr_interface = ifx;
inet_pton(AF_INET6, maddr, &mreq6.ipv6mr_multiaddr);
if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP,
&mreq6, sizeof(mreq6)) == -1)
err(EX_OSERR, "setsockopt(IPV6_JOIN_GROUP)");
if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
err(EX_OSERR, "fcntl(O_NONBLOCK)");
return (s);
}
int
main(int argc __unused, char **argv __unused)
{
char buf[2048];
int n, s, ret, b;
b = n = 0;
s = setup_socket();
while (42) {
ret = recv(s, buf, sizeof(buf), 0);
if (ret > 0)
n++;
else
b++;
if (n % 1234 == 0 || b > 20) {
close(s);
s = setup_socket();
b = 0;
}
if (n % 10000 == 0) {
n++;
fprintf(stdout, ".");
fflush(stdout);
}
}
return (0);
}

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