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If there is only one NIC in the system that is up and running, the

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interface specifier on the command line can be ommited.

Besides of this, the bpf is being reused for each machine
that has to be woken up.

Submitted by:	Marc Balmer <marc@msys.ch>
This commit is contained in:
Martin Blapp 2010-02-08 20:57:49 +00:00
parent 31615ef723
commit 66df920cc9
2 changed files with 86 additions and 45 deletions
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26
usr.sbin/wake/wake.8
View File

@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
.\" Copyright (c) 2009 Marc Balmer <marc@msys.ch>
.\" Copyright (c) 2009, 2010 Marc Balmer <marc@msys.ch>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
@ -23,7 +23,7 @@
.Nd send Wake on LAN frames to hosts on a local Ethernet network
.Sh SYNOPSIS
.Nm
.Ar interface
.Op Ar interface
.Ar lladdr
.Op Ar lladdr ...
.Sh DESCRIPTION
@ -37,21 +37,27 @@ and can be used to power on machines from a remote system without
having physical access to them.
.Pp
.Ar interface
is a network interface of the local machine.
is an Ethernet interface of the local machine and is used to send the
Wake on LAN frames over it.
If there is only one Ethernet device available that is up and running, then the
.Ar interface
argument can be omitted.
.Ar lladdr
are the link layer addresses of the remote machines
and can be specified as the actual hardware address
is the link layer address of the remote machine.
This can be specified as the actual hardware address
(six hexadecimal numbers separated by colons)
or a hostname entry in
or as a hostname entry in
.Pa /etc/ethers .
Link layer addresses can be determined and set on
.Fx
machines using
.Nm
accepts multiple
.Ar lladdr
addresses.
Link layer addresses can be determined and set using
.Xr ifconfig 8 .
.Sh FILES
.Bl -tag -width "/etc/ethers" -compact
.It /etc/ethers
Ethernet host name database.
Ethernet host name data base.
.El
.Sh SEE ALSO
.Xr ethers 5 ,

105
usr.sbin/wake/wake.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2006, 2007, 2008, 2009 Marc Balmer <marc@msys.ch>
* 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
@ -32,11 +32,14 @@ __FBSDID("$FreeBSD$");
#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>
@ -53,38 +56,29 @@ __FBSDID("$FreeBSD$");
#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(const char *iface, const char *host);
static int wake(int bpf, const char *host);
static void
usage(void)
{
(void)fprintf(stderr, "usage: wake interface lladdr [lladdr ...]\n");
(void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n");
exit(1);
}
static int
wake(const char *iface, const char *host)
wake(int bpf, const char *host)
{
struct ether_addr macaddr;
int bpf, res;
bpf = open(_PATH_BPF, O_RDWR);
if (bpf == -1) {
warn("no bpf");
if (get_ether(host, &macaddr) == -1)
return (-1);
}
if (bind_if_to_bpf(iface, bpf) == -1 ||
get_ether(host, &macaddr) == -1) {
(void)close(bpf);
return (-1);
}
res = send_wakeup(bpf, &macaddr);
(void)close(bpf);
return (res);
return send_wakeup(bpf, &macaddr);
}
static int
@ -94,25 +88,49 @@ bind_if_to_bpf(char const *ifname, int bpf)
u_int dlt;
if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >=
sizeof(ifr.ifr_name)) {
warnx("interface name too long: %s", ifname);
sizeof(ifr.ifr_name))
return (-1);
}
if (ioctl(bpf, BIOCSETIF, &ifr) == -1) {
warn("ioctl(%s)", "BIOCSETIF");
if (ioctl(bpf, BIOCSETIF, &ifr) == -1)
return (-1);
}
if (ioctl(bpf, BIOCGDLT, &dlt) == -1) {
warn("ioctl(%s)", "BIOCGDLT");
if (ioctl(bpf, BIOCGDLT, &dlt) == -1)
return (-1);
}
if (dlt != DLT_EN10MB) {
warnx("incompatible media");
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)
{
@ -165,14 +183,31 @@ send_wakeup(int bpf, struct ether_addr const *addr)
int
main(int argc, char *argv[])
{
int n;
int bpf, n;
char ifname[IF_NAMESIZE];
if (argc < 3)
if (argc < 2)
usage();
for (n = 2; n < argc; n++)
if (wake(argv[1], argv[n]))
warnx("error sending Wake on LAN frame over %s to %s",
argv[1], argv[n]);
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();
for (; n < argc; n++)
if (wake(bpf, argv[n]))
warn("Cannot send Wake on LAN frame over `%s' to `%s'",
ifname, argv[n]);
return (0);
}