2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Marc Balmer <marc@msys.ch>
3 * Copyright (C) 2000 Eugene M. Kim. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Author's name may not be used endorse or promote products derived
12 * from this software without specific prior written permission.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
35 #include <net/if_dl.h>
36 #include <net/if_types.h>
37 #include <netinet/in.h>
38 #include <netinet/if_ether.h>
48 #define _PATH_BPF "/dev/bpf"
54 #ifndef DESTADDR_COUNT
55 #define DESTADDR_COUNT 16
58 static int bind_if_to_bpf(char const *ifname, int bpf);
59 static int find_ether(char *dst, size_t len);
60 static int get_ether(char const *text, struct ether_addr *addr);
61 static int send_wakeup(int bpf, struct ether_addr const *addr);
62 static void usage(void);
63 static int wake(int bpf, const char *host);
69 (void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n");
74 wake(int bpf, const char *host)
76 struct ether_addr macaddr;
78 if (get_ether(host, &macaddr) == -1)
81 return (send_wakeup(bpf, &macaddr));
85 bind_if_to_bpf(char const *ifname, int bpf)
90 if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >=
94 if (ioctl(bpf, BIOCSETIF, &ifr) == -1)
97 if (ioctl(bpf, BIOCGDLT, &dlt) == -1)
100 if (dlt != DLT_EN10MB)
107 find_ether(char *dst, size_t len)
109 struct ifaddrs *ifap, *ifa;
110 struct sockaddr_dl *sdl = NULL;
113 if (dst == NULL || len == 0)
116 if (getifaddrs(&ifap) != 0)
119 /* XXX also check the link state */
120 for (nifs = 0, ifa = ifap; ifa; ifa = ifa->ifa_next)
121 if (ifa->ifa_addr->sa_family == AF_LINK &&
122 ifa->ifa_flags & IFF_UP && ifa->ifa_flags & IFF_RUNNING) {
123 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
124 if (sdl->sdl_type == IFT_ETHER) {
125 strlcpy(dst, ifa->ifa_name, len);
131 return (nifs == 1 ? 0 : -1);
135 get_ether(char const *text, struct ether_addr *addr)
137 struct ether_addr *paddr;
139 paddr = ether_aton(text);
144 if (ether_hostton(text, addr)) {
145 warnx("no match for host %s found", text);
152 send_wakeup(int bpf, struct ether_addr const *addr)
155 struct ether_header hdr;
156 u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT];
163 (void)memset(pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost));
164 pkt.hdr.ether_type = htons(0);
165 (void)memset(pkt.data, 0xff, SYNC_LEN);
166 for (p = pkt.data + SYNC_LEN, i = 0; i < DESTADDR_COUNT;
167 p += ETHER_ADDR_LEN, i++)
168 bcopy(addr->octet, p, ETHER_ADDR_LEN);
173 if ((bw = write(bpf, p, len)) == -1) {
184 main(int argc, char *argv[])
187 char ifname[IF_NAMESIZE];
192 if ((bpf = open(_PATH_BPF, O_RDWR)) == -1)
193 err(1, "Cannot open bpf interface");
196 if (bind_if_to_bpf(argv[1], bpf) == -1) {
197 if (find_ether(ifname, sizeof(ifname)))
198 err(1, "Failed to determine ethernet interface");
199 if (bind_if_to_bpf(ifname, bpf) == -1)
200 err(1, "Cannot bind to interface `%s'", ifname);
203 strlcpy(ifname, argv[1], sizeof(ifname));
208 for (; n < argc; n++) {
209 if (wake(bpf, argv[n]) != 0) {
211 warn("Cannot send Wake on LAN frame over `%s' to `%s'",