1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * ether-wake.c - Send a magic packet to wake up sleeping machines.
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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6 | *
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7 | * Author: Donald Becker, http://www.scyld.com/"; http://www.scyld.com/wakeonlan.html
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8 | * Busybox port: Christian Volkmann <haveaniceday@online.de>
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9 | * Used version of ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/";
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10 | */
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11 |
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12 | /* full usage according Donald Becker
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13 | * usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
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14 | *
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15 | * This program generates and transmits a Wake-On-LAN (WOL)\n"
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16 | * \"Magic Packet\", used for restarting machines that have been\n"
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17 | * soft-powered-down (ACPI D3-warm state).\n"
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18 | * It currently generates the standard AMD Magic Packet format, with\n"
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19 | * an optional password appended.\n"
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20 | *
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21 | * The single required parameter is the Ethernet MAC (station) address\n"
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22 | * of the machine to wake or a host ID with known NSS 'ethers' entry.\n"
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23 | * The MAC address may be found with the 'arp' program while the target\n"
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24 | * machine is awake.\n"
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25 | *
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26 | * Options:\n"
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27 | * -b Send wake-up packet to the broadcast address.\n"
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28 | * -D Increase the debug level.\n"
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29 | * -i ifname Use interface IFNAME instead of the default 'eth0'.\n"
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30 | * -p <pw> Append the four or six byte password PW to the packet.\n"
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31 | * A password is only required for a few adapter types.\n"
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32 | * The password may be specified in ethernet hex format\n"
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33 | * or dotted decimal (Internet address)\n"
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34 | * -p 00:22:44:66:88:aa\n"
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35 | * -p 192.168.1.1\n";
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36 | *
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37 | *
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38 | * This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet",
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39 | * used for restarting machines that have been soft-powered-down
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40 | * (ACPI D3-warm state). It currently generates the standard AMD Magic Packet
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41 | * format, with an optional password appended.
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42 | *
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43 | * This software may be used and distributed according to the terms
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44 | * of the GNU Public License, incorporated herein by reference.
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45 | * Contact the author for use under other terms.
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46 | *
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47 | * This source file was originally part of the network tricks package, and
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48 | * is now distributed to support the Scyld Beowulf system.
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49 | * Copyright 1999-2003 Donald Becker and Scyld Computing Corporation.
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50 | *
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51 | * The author may be reached as becker@scyld, or C/O
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52 | * Scyld Computing Corporation
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53 | * 914 Bay Ridge Road, Suite 220
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54 | * Annapolis MD 21403
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55 | *
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56 | * Notes:
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57 | * On some systems dropping root capability allows the process to be
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58 | * dumped, traced or debugged.
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59 | * If someone traces this program, they get control of a raw socket.
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60 | * Linux handles this safely, but beware when porting this program.
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61 | *
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62 | * An alternative to needing 'root' is using a UDP broadcast socket, however
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63 | * doing so only works with adapters configured for unicast+broadcast Rx
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64 | * filter. That configuration consumes more power.
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65 | */
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66 |
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67 |
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68 | #include <unistd.h>
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69 | #include <stdlib.h>
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70 | #include <stdio.h>
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71 | #include <errno.h>
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72 | #include <ctype.h>
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73 | #include <string.h>
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74 |
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75 | #include <sys/socket.h>
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76 | #include <sys/types.h>
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77 | #include <sys/ioctl.h>
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78 | #include <features.h>
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79 | #include <netpacket/packet.h>
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80 | #include <net/ethernet.h>
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81 | #include <netdb.h>
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82 | #include <netinet/ether.h>
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83 |
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84 | #ifdef __linux__
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85 | #include <linux/if.h>
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86 | #endif
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87 |
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88 | #include "busybox.h"
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89 |
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90 | /* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to
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91 | * work as non-root, but we need SOCK_PACKET to specify the Ethernet
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92 | * destination address.
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93 | */
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94 | #ifdef PF_PACKET
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95 | # define whereto_t sockaddr_ll
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96 | # define make_socket() bb_xsocket(PF_PACKET, SOCK_RAW, 0)
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97 | #else
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98 | # define whereto_t sockaddr
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99 | # define make_socket() bb_xsocket(AF_INET, SOCK_PACKET, SOCK_PACKET)
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100 | #endif
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101 |
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102 | #ifdef DEBUG
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103 | # define bb_debug_msg(fmt, args...) fprintf(stderr, fmt, ## args)
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104 | void bb_debug_dump_packet(unsigned char *outpack, int pktsize)
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105 | {
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106 | int i;
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107 | printf("packet dump:\n");
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108 | for (i = 0; i < pktsize; ++i) {
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109 | printf("%2.2x ", outpack[i]);
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110 | if (i % 20 == 19) printf("\n");
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111 | }
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112 | printf("\n\n");
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113 | }
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114 | #else
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115 | # define bb_debug_msg(fmt, args...)
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116 | # define bb_debug_dump_packet(outpack, pktsize)
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117 | #endif
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118 |
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119 | static inline void get_dest_addr(const char *arg, struct ether_addr *eaddr);
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120 | static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast);
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121 | static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd);
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122 |
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123 | int etherwake_main(int argc, char *argv[])
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124 | {
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125 | char *ifname = "eth0", *pass = NULL;
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126 | unsigned long flags;
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127 | unsigned char wol_passwd[6];
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128 | int wol_passwd_sz = 0;
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129 |
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130 | int s; /* Raw socket */
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131 | int pktsize;
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132 | unsigned char outpack[1000];
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133 |
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134 | struct ether_addr eaddr;
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135 | struct whereto_t whereto; /* who to wake up */
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136 |
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137 | /* handle misc user options */
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138 | flags = bb_getopt_ulflags(argc, argv, "bi:p:", &ifname, &pass);
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139 | if (optind == argc)
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140 | bb_show_usage();
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141 | if (pass)
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142 | wol_passwd_sz = get_wol_pw(pass, wol_passwd);
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143 |
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144 | /* create the raw socket */
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145 | s = make_socket();
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146 |
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147 | /* now that we have a raw socket we can drop root */
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148 | xsetuid(getuid());
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149 |
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150 | /* look up the dest mac address */
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151 | get_dest_addr(argv[optind], &eaddr);
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152 |
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153 | /* fill out the header of the packet */
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154 | pktsize = get_fill(outpack, &eaddr, flags /*& 1 [OPT_BROADCAST]*/);
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155 |
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156 | bb_debug_dump_packet(outpack, pktsize);
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157 |
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158 | /* Fill in the source address, if possible. */
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159 | #ifdef __linux__
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160 | {
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161 | struct ifreq if_hwaddr;
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162 |
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163 | strcpy(if_hwaddr.ifr_name, ifname);
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164 | if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0)
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165 | bb_perror_msg_and_die("SIOCGIFHWADDR on %s failed", ifname);
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166 |
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167 | memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
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168 |
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169 | # ifdef DEBUG
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170 | {
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171 | unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
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172 | printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
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173 | "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n\n", ifname,
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174 | if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
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175 | hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
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176 | }
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177 | # endif
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178 | }
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179 | #endif /* __linux__ */
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180 |
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181 | bb_debug_dump_packet(outpack, pktsize);
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182 |
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183 | /* append the password if specified */
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184 | if (wol_passwd_sz > 0) {
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185 | memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz);
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186 | pktsize += wol_passwd_sz;
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187 | }
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188 |
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189 | bb_debug_dump_packet(outpack, pktsize);
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190 |
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191 | /* This is necessary for broadcasts to work */
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192 | if (flags /*& 1 [OPT_BROADCAST]*/) {
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193 | int one = 1;
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194 | if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (void *)&one, sizeof(one)) < 0)
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195 | bb_perror_msg("SO_BROADCAST");
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196 | }
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197 |
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198 | #if defined(PF_PACKET)
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199 | {
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200 | struct ifreq ifr;
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201 | strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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202 | if (ioctl(s, SIOCGIFINDEX, &ifr) == -1)
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203 | bb_perror_msg_and_die("SIOCGIFINDEX");
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204 | memset(&whereto, 0, sizeof(whereto));
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205 | whereto.sll_family = AF_PACKET;
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206 | whereto.sll_ifindex = ifr.ifr_ifindex;
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207 | /* The manual page incorrectly claims the address must be filled.
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208 | We do so because the code may change to match the docs. */
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209 | whereto.sll_halen = ETH_ALEN;
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210 | memcpy(whereto.sll_addr, outpack, ETH_ALEN);
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211 | }
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212 | #else
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213 | whereto.sa_family = 0;
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214 | strcpy(whereto.sa_data, ifname);
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215 | #endif
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216 |
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217 | if (sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
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218 | bb_perror_msg(bb_msg_write_error);
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219 |
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220 | close(s);
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221 |
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222 | return EXIT_SUCCESS;
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223 | }
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224 |
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225 | /* Convert the host ID string to a MAC address.
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226 | * The string may be a:
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227 | * Host name
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228 | * IP address string
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229 | * MAC address string
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230 | */
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231 | static inline void get_dest_addr(const char *hostid, struct ether_addr *eaddr)
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232 | {
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233 | struct ether_addr *eap;
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234 |
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235 | eap = ether_aton(hostid);
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236 | if (eap) {
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237 | *eaddr = *eap;
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238 | bb_debug_msg("The target station address is %s\n\n", ether_ntoa(eaddr));
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239 | #if !defined(__UCLIBC__)
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240 | } else if (ether_hostton(hostid, eaddr) == 0) {
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241 | bb_debug_msg("Station address for hostname %s is %s\n\n", hostid, ether_ntoa(eaddr));
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242 | #else
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243 | # warning Need to implement ether_hostton() for uClibc
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244 | #endif
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245 | } else
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246 | bb_show_usage();
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247 | }
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248 |
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249 | static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
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250 | {
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251 | int offset, i;
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252 | unsigned char *station_addr = eaddr->ether_addr_octet;
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253 |
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254 | if (broadcast)
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255 | memset(pkt+0, 0xff, 6);
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256 | else
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257 | memcpy(pkt, station_addr, 6);
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258 | memcpy(pkt+6, station_addr, 6);
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259 | pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */
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260 | pkt[13] = 0x42;
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261 | offset = 14;
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262 |
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263 | memset(pkt+offset, 0xff, 6);
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264 | offset += 6;
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265 |
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266 | for (i = 0; i < 16; ++i) {
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267 | memcpy(pkt+offset, station_addr, 6);
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268 | offset += 6;
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269 | }
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270 |
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271 | return offset;
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272 | }
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273 |
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274 | static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd)
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275 | {
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276 | int passwd[6];
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277 | int byte_cnt, i;
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278 |
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279 | /* handle MAC format */
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280 | byte_cnt = sscanf(ethoptarg, "%2x:%2x:%2x:%2x:%2x:%2x",
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281 | &passwd[0], &passwd[1], &passwd[2],
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282 | &passwd[3], &passwd[4], &passwd[5]);
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283 | /* handle IP format */
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284 | if (byte_cnt < 4)
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285 | byte_cnt = sscanf(ethoptarg, "%d.%d.%d.%d",
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286 | &passwd[0], &passwd[1], &passwd[2], &passwd[3]);
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287 | if (byte_cnt < 4) {
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288 | bb_error_msg("Unable to read the Wake-On-LAN pass");
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289 | return 0;
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290 | }
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291 |
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292 | for (i = 0; i < byte_cnt; ++i)
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293 | wol_passwd[i] = passwd[i];
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294 |
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295 | bb_debug_msg("password: %2.2x %2.2x %2.2x %2.2x (%d)\n\n",
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296 | wol_passwd[0], wol_passwd[1], wol_passwd[2], wol_passwd[3],
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297 | byte_cnt);
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298 |
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299 | return byte_cnt;
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300 | }
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