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/* $OpenBSD: mc6send.c,v 1.1.1.1 2019/09/05 01:50:34 bluhm Exp $ */
/*
* Copyright (c) 2019 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
void __dead usage(void);
void __dead
usage(void)
{
fprintf(stderr,
"mc6send [-f file] [-g group] [-i ifname] [-m message] [-p port]\n"
" -f file print message to log file, default stdout\n"
" -g group multicast group, default 224.0.0.123\n"
" -i ifname multicast interface address\n"
" -m message message in payload, maximum 255 characters, default foo\n"
" -l loop disable or enable loopback, 0 or 1\n"
" -p port destination port number, default 12345\n"
" -t ttl set multicast ttl\n");
exit(2);
}
int
main(int argc, char *argv[])
{
struct sockaddr_in6 sin6;
FILE *log;
const char *errstr, *file, *group, *ifname, *msg;
size_t len;
ssize_t n;
int ch, s, loop, port, ttl;
unsigned int ifindex;
log = stdout;
file = NULL;
group = "ff04::123";
ifname = NULL;
loop = -1;
msg = "foo";
port = 12345;
ttl = -1;
while ((ch = getopt(argc, argv, "f:g:i:l:m:p:t:")) != -1) {
switch (ch) {
case 'f':
file = optarg;
break;
case 'g':
group = optarg;
break;
case 'i':
ifname = optarg;
break;
case 'l':
loop = strtonum(optarg, 0, 1, &errstr);
if (errstr != NULL)
errx(1, "loop is %s: %s", errstr, optarg);
break;
case 'm':
msg = optarg;
break;
case 'p':
port = strtonum(optarg, 1, 0xffff, &errstr);
if (errstr != NULL)
errx(1, "port is %s: %s", errstr, optarg);
break;
case 't':
ttl = strtonum(optarg, 0, 255, &errstr);
if (errstr != NULL)
errx(1, "ttl is %s: %s", errstr, optarg);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc)
usage();
if (file != NULL) {
log = fopen(file, "w");
if (log == NULL)
err(1, "fopen %s", file);
}
s = socket(AF_INET6, SOCK_DGRAM, 0);
if (s == -1)
err(1, "socket");
if (ifname != NULL) {
ifindex = if_nametoindex(ifname);
if (ifindex == 0)
err(1, "if_nametoindex %s", ifname);
if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &ifindex,
sizeof(ifindex)) == -1)
err(1, "setsockopt IPV6_MULTICAST_IF %s", ifname);
}
if (loop != -1) {
if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop,
sizeof(loop)) == -1)
err(1, "setsockopt loop %d", loop);
}
if (ttl != -1) {
if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl,
sizeof(ttl)) == -1)
err(1, "setsockopt ttl %d", ttl);
}
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_len = sizeof(sin6);
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(port);
if (inet_pton(AF_INET6, group, &sin6.sin6_addr) == -1)
err(1, "inet_pton %s", group);
if (ifname != NULL &&
(IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) ||
IN6_IS_ADDR_MC_INTFACELOCAL(&sin6.sin6_addr))) {
sin6.sin6_scope_id = ifindex;
}
if (connect(s, (struct sockaddr *)&sin6, sizeof(sin6)) == -1)
err(1, "connect [%s]:%d", group, port);
len = strlen(msg);
if (len >= 255)
err(1, "message too long %zu", len);
n = send(s, msg, len, 0);
if (n == -1)
err(1, "send");
if ((size_t)n != len)
errx(1, "send %zd", n);
fprintf(log, ">>> %s\n", msg);
fflush(log);
return 0;
}
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