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/* $OpenBSD: wake.c,v 1.10 2009/01/29 14:18:20 pyr Exp $ */
/*
* Copyright (C) 2006,2007,2008,2009 Marc Balmer <mbalmer@openbsd.org>
* 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/types.h>
#include <sys/queue.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/bpf.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#ifndef BPF_PATH_FORMAT
#define BPF_PATH_FORMAT "/dev/bpf%u"
#endif
#ifndef SYNC_LEN
#define SYNC_LEN 6
#endif
#ifndef DESTADDR_COUNT
#define DESTADDR_COUNT 16
#endif
__dead void usage(void);
int wake(const char *iface, const char *host);
int get_bpf(void);
int bind_if_to_bpf(char const *ifname, int bpf);
int get_ether(char const *text, struct ether_addr *addr);
void send_wakeup(int bpf, struct ether_addr const *addr);
void
usage(void)
{
extern char *__progname;
(void)fprintf(stderr, "usage: %s interface lladdr\n", __progname);
exit(0);
}
int
wake(const char *iface, const char *host)
{
int bpf;
struct ether_addr macaddr;
bpf = get_bpf();
if (bpf == -1)
return -1;
if (bind_if_to_bpf(iface, bpf) == -1 ||
get_ether(host, &macaddr) == -1) {
(void)close(bpf);
return -1;
}
send_wakeup(bpf, &macaddr);
(void)close(bpf);
return 0;
}
int
get_bpf(void)
{
int i, fd;
char *path;
for (i = 0;; i++) {
if (asprintf(&path, BPF_PATH_FORMAT, i) == -1)
return -1;
fd = open(path, O_RDWR);
free(path);
if (fd != -1)
return fd;
if (errno == EBUSY)
continue;
break;
}
return -1;
}
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;
}
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))
return -1;
return 0;
}
void
send_wakeup(int bpf, struct ether_addr const *addr)
{
struct {
struct ether_header hdr;
u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT];
} pkt;
u_char *p;
int i;
ssize_t bw;
ssize_t len;
(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->ether_addr_octet, p, ETHER_ADDR_LEN);
p = (u_char *)&pkt;
len = sizeof(pkt);
bw = 0;
while (len) {
if ((bw = write(bpf, &pkt, sizeof(pkt))) == -1)
err(1, "cannot send Wake on LAN frame");
len -= bw;
p += bw;
}
}
int
main(int argc, char *argv[])
{
if (argc != 3)
usage();
if (wake(argv[1], argv[2]))
err(1, "error sending Wake on LAN frame over %s to %s",
argv[1], argv[2]);
return 0;
}
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