Add wake, a tool to send Wake on LAN frames to hosts on a local Ethernet network

Submitted by:   Marc Balmer <marc@msys.ch>
Reviewed by:    rwatson
Approved by:	re

M    usr.sbin/Makefile
A    usr.sbin/wake
AM   usr.sbin/wake/wake.c
AM   usr.sbin/wake/Makefile
AM   usr.sbin/wake/wake.8

4 files changed, 244 insertions, 0 deletions

diff --git a/usr.sbin/Makefile b/usr.sbin/Makefile
index 9484c06..f57ff3a 100644
--- a/usr.sbin/Makefile
+++ b/usr.sbin/Makefile
@@ -190,6 +190,7 @@ SUBDIR=	${_ac} \
 	${_usbconfig} \
 	${_vidcontrol} \
 	vipw \
+	wake \
 	watch \
 	watchdogd \
 	${_wlandebug} \
diff --git a/usr.sbin/wake/Makefile b/usr.sbin/wake/Makefile
new file mode 100644
index 0000000..e976cdc
--- /dev/null
+++ b/usr.sbin/wake/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+PROG=	wake
+MAN=	wake.8
+
+WARNS?= 2
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/wake/wake.8 b/usr.sbin/wake/wake.8
new file mode 100644
index 0000000..03a283b
--- /dev/null
+++ b/usr.sbin/wake/wake.8
@@ -0,0 +1,61 @@
+.\"
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 2009 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
+.\" 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.
+.\"
+.Dd June 27 2009
+.Dt WAKE 8
+.Os
+.Sh NAME
+.Nm wake
+.Nd send Wake on LAN frames to hosts on a local Ethernet network
+.Sh SYNOPSIS
+.Nm
+.Ar interface
+.Op Ar lladdr ...
+.Sh DESCRIPTION
+The
+.Nm
+program is used to send Wake on LAN (WoL) frames over a local
+Ethernet network to one or more hosts using their link layer (hardware)
+addresses.
+WoL functionality is generally enabled in a machine's BIOS
+and can be used to power on machines from a remote system without
+having physical access to them.
+.Pp
+.Ar interface
+is the network interface of the local machine.
+.Ar lladdr
+are the link layer addresses of the remote machines
+and can be specified as the actual hardware address
+(six hexadecimal numbers separated by colons)
+or a hostname entry in
+.Pa /etc/ethers .
+Link layer addresses can be determined and set on
+.Fx
+machines using
+.Xr ifconfig 8 .
+.Sh FILES
+.Bl -tag -width "/etc/ethers" -compact
+.It /etc/ethers
+Ethernet host name database.
+.El
+.Sh SEE ALSO
+.Xr ethers 5 ,
+.Xr ifconfig 8
+.Sh AUTHORS
+.Nm
+was written by
+.Ar Marc Balmer Aq marc@msys.ch .
diff --git a/usr.sbin/wake/wake.c b/usr.sbin/wake/wake.c
new file mode 100644
index 0000000..3319810
--- /dev/null
+++ b/usr.sbin/wake/wake.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2006, 2007, 2008, 2009 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>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.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>
+
+#define _PATH_BPF	"/dev/bpf"
+
+#ifndef SYNC_LEN
+#define SYNC_LEN 6
+#endif
+
+#ifndef DESTADDR_COUNT
+#define DESTADDR_COUNT 16
+#endif
+
+void usage(void);
+
+int wake(const char *iface, const char *host);
+int bind_if_to_bpf(char const *ifname, int bpf);
+int get_ether(char const *text, struct ether_addr *addr);
+int send_wakeup(int bpf, struct ether_addr const *addr);
+
+void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: wake interface lladdr\n");
+	exit(0);
+}
+
+int
+wake(const char *iface, const char *host)
+{
+	int res, bpf;
+	struct ether_addr macaddr;
+
+	bpf = open(_PATH_BPF, O_RDWR);
+	if (bpf == -1) {
+		printf("no bpf\n");
+		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;
+}
+
+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;
+}
+
+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];
+	} 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->octet, p, ETHER_ADDR_LEN);
+	p = (u_char *)&pkt;
+	len = sizeof(pkt);
+	bw = 0;
+	while (len) {
+		if ((bw = write(bpf, &pkt, sizeof(pkt))) == -1)
+			return -1;
+		len -= bw;
+		p += bw;
+	}
+	return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+	int n;
+
+	if (argc < 3)
+		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]);
+	return 0;
+}