1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Marc Balmer <marc@msys.ch> 5 * Copyright (C) 2000 Eugene M. Kim. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Author's name may not be used endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/ioctl.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 #include <net/bpf.h> 36 #include <net/if.h> 37 #include <net/if_dl.h> 38 #include <net/if_types.h> 39 #include <netinet/in.h> 40 #include <netinet/if_ether.h> 41 42 #include <err.h> 43 #include <fcntl.h> 44 #include <ifaddrs.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #define _PATH_BPF "/dev/bpf" 51 52 #ifndef SYNC_LEN 53 #define SYNC_LEN 6 54 #endif 55 56 #ifndef DESTADDR_COUNT 57 #define DESTADDR_COUNT 16 58 #endif 59 60 static int bind_if_to_bpf(char const *ifname, int bpf); 61 static int find_ether(char *dst, size_t len); 62 static int get_ether(char const *text, struct ether_addr *addr); 63 static int send_wakeup(int bpf, struct ether_addr const *addr); 64 static void usage(void); 65 static int wake(int bpf, const char *host); 66 67 static void 68 usage(void) 69 { 70 71 (void)fprintf(stderr, "usage: wake [interface] lladdr [lladdr ...]\n"); 72 exit(1); 73 } 74 75 static int 76 wake(int bpf, const char *host) 77 { 78 struct ether_addr macaddr; 79 80 if (get_ether(host, &macaddr) == -1) 81 return (-1); 82 83 return (send_wakeup(bpf, &macaddr)); 84 } 85 86 static int 87 bind_if_to_bpf(char const *ifname, int bpf) 88 { 89 struct ifreq ifr; 90 u_int dlt; 91 92 if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >= 93 sizeof(ifr.ifr_name)) 94 return (-1); 95 96 if (ioctl(bpf, BIOCSETIF, &ifr) == -1) 97 return (-1); 98 99 if (ioctl(bpf, BIOCGDLT, &dlt) == -1) 100 return (-1); 101 102 if (dlt != DLT_EN10MB) 103 return (-1); 104 105 return (0); 106 } 107 108 static int 109 find_ether(char *dst, size_t len) 110 { 111 struct ifaddrs *ifap, *ifa; 112 struct sockaddr_dl *sdl = NULL; 113 int nifs; 114 115 if (dst == NULL || len == 0) 116 return (0); 117 118 if (getifaddrs(&ifap) != 0) 119 return (-1); 120 121 /* XXX also check the link state */ 122 for (nifs = 0, ifa = ifap; ifa; ifa = ifa->ifa_next) 123 if (ifa->ifa_addr->sa_family == AF_LINK && 124 ifa->ifa_flags & IFF_UP && ifa->ifa_flags & IFF_RUNNING) { 125 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 126 if (sdl->sdl_type == IFT_ETHER) { 127 strlcpy(dst, ifa->ifa_name, len); 128 nifs++; 129 } 130 } 131 132 freeifaddrs(ifap); 133 return (nifs == 1 ? 0 : -1); 134 } 135 136 static int 137 get_ether(char const *text, struct ether_addr *addr) 138 { 139 struct ether_addr *paddr; 140 141 paddr = ether_aton(text); 142 if (paddr != NULL) { 143 *addr = *paddr; 144 return (0); 145 } 146 if (ether_hostton(text, addr)) { 147 warnx("no match for host %s found", text); 148 return (-1); 149 } 150 return (0); 151 } 152 153 static int 154 send_wakeup(int bpf, struct ether_addr const *addr) 155 { 156 struct { 157 struct ether_header hdr; 158 u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT]; 159 } __packed pkt; 160 u_char *p; 161 ssize_t bw; 162 ssize_t len; 163 int i; 164 165 (void)memset(pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost)); 166 pkt.hdr.ether_type = htons(0); 167 (void)memset(pkt.data, 0xff, SYNC_LEN); 168 for (p = pkt.data + SYNC_LEN, i = 0; i < DESTADDR_COUNT; 169 p += ETHER_ADDR_LEN, i++) 170 bcopy(addr->octet, p, ETHER_ADDR_LEN); 171 p = (u_char *)&pkt; 172 len = sizeof(pkt); 173 bw = 0; 174 while (len) { 175 if ((bw = write(bpf, p, len)) == -1) { 176 warn("write()"); 177 return (-1); 178 } 179 len -= bw; 180 p += bw; 181 } 182 return (0); 183 } 184 185 int 186 main(int argc, char *argv[]) 187 { 188 int bpf, n, rval; 189 char ifname[IF_NAMESIZE]; 190 191 if (argc < 2) 192 usage(); 193 194 if ((bpf = open(_PATH_BPF, O_RDWR)) == -1) 195 err(1, "Cannot open bpf interface"); 196 197 n = 2; 198 if (bind_if_to_bpf(argv[1], bpf) == -1) { 199 if (find_ether(ifname, sizeof(ifname))) 200 err(1, "Failed to determine ethernet interface"); 201 if (bind_if_to_bpf(ifname, bpf) == -1) 202 err(1, "Cannot bind to interface `%s'", ifname); 203 --n; 204 } else 205 strlcpy(ifname, argv[1], sizeof(ifname)); 206 207 if (n >= argc) 208 usage(); 209 rval = 0; 210 for (; n < argc; n++) { 211 if (wake(bpf, argv[n]) != 0) { 212 rval = 1; 213 warn("Cannot send Wake on LAN frame over `%s' to `%s'", 214 ifname, argv[n]); 215 } 216 } 217 exit(rval); 218 } 219