diff options
Diffstat (limited to 'usr.sbin/wake/wake.c')
| -rw-r--r-- | usr.sbin/wake/wake.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/usr.sbin/wake/wake.c b/usr.sbin/wake/wake.c new file mode 100644 index 0000000..b7737da --- /dev/null +++ b/usr.sbin/wake/wake.c @@ -0,0 +1,216 @@ +/* + * 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 + * 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/ioctl.h> +#include <sys/socket.h> +#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> +#include <unistd.h> + +#define _PATH_BPF "/dev/bpf" + +#ifndef SYNC_LEN +#define SYNC_LEN 6 +#endif + +#ifndef DESTADDR_COUNT +#define DESTADDR_COUNT 16 +#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(int bpf, const char *host); + +static void +usage(void) +{ + + (void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n"); + exit(1); +} + +static int +wake(int bpf, const char *host) +{ + struct ether_addr macaddr; + + if (get_ether(host, &macaddr) == -1) + return (-1); + + return (send_wakeup(bpf, &macaddr)); +} + +static 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); +} + +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) +{ + struct ether_addr *paddr; + + paddr = ether_aton(text); + if (paddr != NULL) { + *addr = *paddr; + return (0); + } + if (ether_hostton(text, addr)) { + warnx("no match for host %s found", text); + return (-1); + } + return (0); +} + +static 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]; + } __packed pkt; + u_char *p; + ssize_t bw; + ssize_t len; + int i; + + (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, p, len)) == -1) { + warn("write()"); + return (-1); + } + len -= bw; + p += bw; + } + return (0); +} + +int +main(int argc, char *argv[]) +{ + int bpf, n, rval; + char ifname[IF_NAMESIZE]; + + if (argc < 2) + usage(); + + 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(); + rval = 0; + for (; n < argc; n++) { + if (wake(bpf, argv[n]) != 0) { + rval = 1; + warn("Cannot send Wake on LAN frame over `%s' to `%s'", + ifname, argv[n]); + } + } + exit(rval); +} |
