214 lines
4.9 KiB
C
214 lines
4.9 KiB
C
/*
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* Copyright (C) 2006, 2007, 2008, 2009, 2010 Marc Balmer <marc@msys.ch>
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* Copyright (C) 2000 Eugene M. Kim. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Author's name may not be used endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <net/bpf.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <err.h>
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#include <fcntl.h>
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#include <ifaddrs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define _PATH_BPF "/dev/bpf"
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#ifndef SYNC_LEN
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#define SYNC_LEN 6
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#endif
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#ifndef DESTADDR_COUNT
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#define DESTADDR_COUNT 16
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#endif
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static int bind_if_to_bpf(char const *ifname, int bpf);
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static int find_ether(char *dst, size_t len);
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static int get_ether(char const *text, struct ether_addr *addr);
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static int send_wakeup(int bpf, struct ether_addr const *addr);
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static void usage(void);
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static int wake(int bpf, const char *host);
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n");
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exit(1);
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}
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static int
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wake(int bpf, const char *host)
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{
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struct ether_addr macaddr;
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if (get_ether(host, &macaddr) == -1)
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return (-1);
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return (send_wakeup(bpf, &macaddr));
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}
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static int
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bind_if_to_bpf(char const *ifname, int bpf)
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{
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struct ifreq ifr;
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u_int dlt;
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if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >=
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sizeof(ifr.ifr_name))
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return (-1);
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if (ioctl(bpf, BIOCSETIF, &ifr) == -1)
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return (-1);
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if (ioctl(bpf, BIOCGDLT, &dlt) == -1)
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return (-1);
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if (dlt != DLT_EN10MB)
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return (-1);
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return (0);
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}
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static int
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find_ether(char *dst, size_t len)
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{
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struct ifaddrs *ifap, *ifa;
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struct sockaddr_dl *sdl = NULL;
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int nifs;
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if (dst == NULL || len == 0)
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return (0);
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if (getifaddrs(&ifap) != 0)
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return (-1);
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/* XXX also check the link state */
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for (nifs = 0, ifa = ifap; ifa; ifa = ifa->ifa_next)
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if (ifa->ifa_addr->sa_family == AF_LINK &&
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ifa->ifa_flags & IFF_UP && ifa->ifa_flags & IFF_RUNNING) {
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sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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if (sdl->sdl_type == IFT_ETHER) {
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strlcpy(dst, ifa->ifa_name, len);
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nifs++;
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}
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}
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freeifaddrs(ifap);
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return (nifs == 1 ? 0 : -1);
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}
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static int
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get_ether(char const *text, struct ether_addr *addr)
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{
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struct ether_addr *paddr;
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paddr = ether_aton(text);
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if (paddr != NULL) {
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*addr = *paddr;
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return (0);
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}
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if (ether_hostton(text, addr)) {
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warnx("no match for host %s found", text);
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return (-1);
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}
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return (0);
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}
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static int
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send_wakeup(int bpf, struct ether_addr const *addr)
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{
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struct {
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struct ether_header hdr;
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u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT];
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} __packed pkt;
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u_char *p;
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ssize_t bw;
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ssize_t len;
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int i;
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(void)memset(pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost));
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pkt.hdr.ether_type = htons(0);
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(void)memset(pkt.data, 0xff, SYNC_LEN);
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for (p = pkt.data + SYNC_LEN, i = 0; i < DESTADDR_COUNT;
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p += ETHER_ADDR_LEN, i++)
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bcopy(addr->octet, p, ETHER_ADDR_LEN);
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p = (u_char *)&pkt;
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len = sizeof(pkt);
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bw = 0;
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while (len) {
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if ((bw = write(bpf, p, len)) == -1) {
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warn("write()");
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return (-1);
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}
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len -= bw;
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p += bw;
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}
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return (0);
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}
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int
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main(int argc, char *argv[])
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{
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int bpf, n;
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char ifname[IF_NAMESIZE];
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if (argc < 2)
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usage();
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if ((bpf = open(_PATH_BPF, O_RDWR)) == -1)
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err(1, "Cannot open bpf interface");
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n = 2;
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if (bind_if_to_bpf(argv[1], bpf) == -1) {
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if (find_ether(ifname, sizeof(ifname)))
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err(1, "Failed to determine ethernet interface");
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if (bind_if_to_bpf(ifname, bpf) == -1)
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err(1, "Cannot bind to interface `%s'", ifname);
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--n;
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} else
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strlcpy(ifname, argv[1], sizeof(ifname));
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if (n >= argc)
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usage();
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for (; n < argc; n++)
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if (wake(bpf, argv[n]))
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warn("Cannot send Wake on LAN frame over `%s' to `%s'",
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ifname, argv[n]);
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return (0);
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}
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