/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (C) 2006, 2007, 2008, 2009, 2010 Marc Balmer <marc@msys.ch>
* Copyright (C) 2000 Eugene M. Kim. All rights reserved.
*
* 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. Author's name may not be used endorse or promote products derived
* from this software without specific prior written permission.
*
* 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>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <err.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define _PATH_BPF "/dev/bpf"
#ifndef SYNC_LEN
#define SYNC_LEN 6
#endif
#ifndef DESTADDR_COUNT
#define DESTADDR_COUNT 16
#endif
static int bind_if_to_bpf(char const *ifname, int bpf);
static int find_ether(char *dst, size_t len);
static int get_ether(char const *text, struct ether_addr *addr);
static int send_wakeup(int bpf, struct ether_addr const *addr);
static void usage(void);
static int wake(int bpf, const char *host);
static void
usage(void)
{
(void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n");
exit(1);
}
static int
wake(int bpf, const char *host)
{
struct ether_addr macaddr;
if (get_ether(host, &macaddr) == -1)
return (-1);
return (send_wakeup(bpf, &macaddr));
}
static int
bind_if_to_bpf(char const *ifname, int bpf)
{
struct ifreq ifr;
u_int dlt;
if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >=
sizeof(ifr.ifr_name))
return (-1);
if (ioctl(bpf, BIOCSETIF, &ifr) == -1)
return (-1);
if (ioctl(bpf, BIOCGDLT, &dlt) == -1)
return (-1);
if (dlt != DLT_EN10MB)
return (-1);
return (0);
}
static int
find_ether(char *dst, size_t len)
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_dl *sdl = NULL;
int nifs;
if (dst == NULL || len == 0)
return (0);
if (getifaddrs(&ifap) != 0)
return (-1);
/* XXX also check the link state */
for (nifs = 0, ifa = ifap; ifa; ifa = ifa->ifa_next)
if (ifa->ifa_addr->sa_family == AF_LINK &&
ifa->ifa_flags & IFF_UP && ifa->ifa_flags & IFF_RUNNING) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl->sdl_type == IFT_ETHER) {
strlcpy(dst, ifa->ifa_name, len);
nifs++;
}
}
freeifaddrs(ifap);
return (nifs == 1 ? 0 : -1);
}
static int
get_ether(char const *text, struct ether_addr *addr)
{
struct ether_addr *paddr;
paddr = ether_aton(text);
if (paddr != NULL) {
*addr = *paddr;
return (0);
}
if (ether_hostton(text, addr)) {
warnx("no match for host %s found", text);
return (-1);
}
return (0);
}
static int
send_wakeup(int bpf, struct ether_addr const *addr)
{
struct {
struct ether_header hdr;
u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT];
} __packed pkt;
u_char *p;
ssize_t bw;
ssize_t len;
int i;
(void)memset(pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost));
pkt.hdr.ether_type = htons(0);
(void)memset(pkt.data, 0xff, SYNC_LEN);
for (p = pkt.data + SYNC_LEN, i = 0; i < DESTADDR_COUNT;
p += ETHER_ADDR_LEN, i++)
bcopy(addr->octet, p, ETHER_ADDR_LEN);
p = (u_char *)&pkt;
len = sizeof(pkt);
bw = 0;
while (len) {
if ((bw = write(bpf, p, len)) == -1) {
warn("write()");
return (-1);
}
len -= bw;
p += bw;
}
return (0);
}
int
main(int argc, char *argv[])
{
int bpf, n, rval;
char ifname[IF_NAMESIZE];
if (argc < 2)
usage();
if ((bpf = open(_PATH_BPF, O_RDWR)) == -1)
err(1, "Cannot open bpf interface");
n = 2;
if (bind_if_to_bpf(argv[1], bpf) == -1) {
if (find_ether(ifname, sizeof(ifname)))
err(1, "Failed to determine ethernet interface");
if (bind_if_to_bpf(ifname, bpf) == -1)
err(1, "Cannot bind to interface `%s'", ifname);
--n;
} else
strlcpy(ifname, argv[1], sizeof(ifname));
if (n >= argc)
usage();
rval = 0;
for (; n < argc; n++) {
if (wake(bpf, argv[n]) != 0) {
rval = 1;
warn("Cannot send Wake on LAN frame over `%s' to `%s'",
ifname, argv[n]);
}
}
exit(rval);
}
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