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authorMike Frysinger <vapier@gentoo.org>2005-05-11 03:59:53 +0000
committerMike Frysinger <vapier@gentoo.org>2005-05-11 03:59:53 +0000
commitb662f0d58ba40cbbc1cca849fb6e8665688deb5e (patch)
tree9c39ef7e5ff639fac2b67a0b403385c345689c7d /networking/ether-wake.c
parent348e84c202c4946d3694f130a6f81f61eb1d4b9e (diff)
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import ether-wake applet by haveaniceday Bug 252
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1/*
2 * ether-wake.c - Send a magic packet to wake up sleeping machines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Author: Donald Becker, http://www.scyld.com/"; http://www.scyld.com/wakeonlan.html
10 * Busybox port: Christian Volkmann <haveaniceday@online.de>
11 * Used version of ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/";
12 */
13
14/* full usage according Donald Becker
15 * usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
16 *
17 * This program generates and transmits a Wake-On-LAN (WOL)\n"
18 * \"Magic Packet\", used for restarting machines that have been\n"
19 * soft-powered-down (ACPI D3-warm state).\n"
20 * It currently generates the standard AMD Magic Packet format, with\n"
21 * an optional password appended.\n"
22 *
23 * The single required parameter is the Ethernet MAC (station) address\n"
24 * of the machine to wake or a host ID with known NSS 'ethers' entry.\n"
25 * The MAC address may be found with the 'arp' program while the target\n"
26 * machine is awake.\n"
27 *
28 * Options:\n"
29 * -b Send wake-up packet to the broadcast address.\n"
30 * -D Increase the debug level.\n"
31 * -i ifname Use interface IFNAME instead of the default 'eth0'.\n"
32 * -p <pw> Append the four or six byte password PW to the packet.\n"
33 * A password is only required for a few adapter types.\n"
34 * The password may be specified in ethernet hex format\n"
35 * or dotted decimal (Internet address)\n"
36 * -p 00:22:44:66:88:aa\n"
37 * -p 192.168.1.1\n";
38 *
39 *
40 * This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet",
41 * used for restarting machines that have been soft-powered-down
42 * (ACPI D3-warm state). It currently generates the standard AMD Magic Packet
43 * format, with an optional password appended.
44 *
45 * This software may be used and distributed according to the terms
46 * of the GNU Public License, incorporated herein by reference.
47 * Contact the author for use under other terms.
48 *
49 * This source file was originally part of the network tricks package, and
50 * is now distributed to support the Scyld Beowulf system.
51 * Copyright 1999-2003 Donald Becker and Scyld Computing Corporation.
52 *
53 * The author may be reached as becker@scyld, or C/O
54 * Scyld Computing Corporation
55 * 914 Bay Ridge Road, Suite 220
56 * Annapolis MD 21403
57 *
58 * Notes:
59 * On some systems dropping root capability allows the process to be
60 * dumped, traced or debugged.
61 * If someone traces this program, they get control of a raw socket.
62 * Linux handles this safely, but beware when porting this program.
63 *
64 * An alternative to needing 'root' is using a UDP broadcast socket, however
65 * doing so only works with adapters configured for unicast+broadcast Rx
66 * filter. That configuration consumes more power.
67*/
68
69
70#include <unistd.h>
71#include <stdlib.h>
72#include <stdio.h>
73#include <errno.h>
74#include <ctype.h>
75#include <string.h>
76
77#include <sys/socket.h>
78#include <sys/types.h>
79#include <sys/ioctl.h>
80#include <features.h>
81#include <netpacket/packet.h>
82#include <net/ethernet.h>
83#include <netdb.h>
84#include <netinet/ether.h>
85
86#ifdef __linux__
87#include <linux/if.h>
88#endif
89
90#include "busybox.h"
91
92/* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to
93 * work as non-root, but we need SOCK_PACKET to specify the Ethernet
94 * destination address.
95 */
96#ifdef PF_PACKET
97# define whereto_t sockaddr_ll
98# define make_socket() socket(PF_PACKET, SOCK_RAW, 0)
99#else
100# define whereto_t sockaddr
101# define make_socket() socket(AF_INET, SOCK_PACKET, SOCK_PACKET)
102#endif
103
104#ifdef DEBUG
105# define bb_debug_msg(fmt, args...) fprintf(stderr, fmt, ## args)
106void bb_debug_dump_packet(unsigned char *outpack, int pktsize)
107{
108 int i;
109 printf("packet dump:\n");
110 for (i = 0; i < pktsize; ++i) {
111 printf("%2.2x ", outpack[i]);
112 if (i % 20 == 19) printf("\n");
113 }
114 printf("\n\n");
115}
116#else
117# define bb_debug_msg(fmt, args...)
118# define bb_debug_dump_packet(outpack, pktsize)
119#endif
120
121static inline void get_dest_addr(const char *arg, struct ether_addr *eaddr);
122static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast);
123static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd);
124
125int etherwake_main(int argc, char *argv[])
126{
127 char *ifname = "eth0", *pass = NULL;
128 unsigned long flags;
129 unsigned char wol_passwd[6];
130 int wol_passwd_sz = 0;
131
132 int s; /* Raw socket */
133 int pktsize;
134 unsigned char outpack[1000];
135
136 struct ether_addr eaddr;
137 struct whereto_t whereto; /* who to wake up */
138
139 /* handle misc user options */
140 flags = bb_getopt_ulflags(argc, argv, "bi:p:", &ifname, &pass);
141 if (optind == argc)
142 bb_show_usage();
143 if (pass)
144 wol_passwd_sz = get_wol_pw(pass, wol_passwd);
145
146 /* create the raw socket */
147 s = make_socket();
148 if (s < 0)
149 bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
150
151 /* now that we have a raw socket we can drop root */
152 setuid(getuid());
153
154 /* look up the dest mac address */
155 get_dest_addr(argv[optind], &eaddr);
156
157 /* fill out the header of the packet */
158 pktsize = get_fill(outpack, &eaddr, flags /*& 1 [OPT_BROADCAST]*/);
159
160 bb_debug_dump_packet(outpack, pktsize);
161
162 /* Fill in the source address, if possible. */
163#ifdef __linux__
164 {
165 struct ifreq if_hwaddr;
166
167 strcpy(if_hwaddr.ifr_name, ifname);
168 if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0)
169 bb_perror_msg_and_die("SIOCGIFHWADDR on %s failed", ifname);
170
171 memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
172
173# ifdef DEBUG
174 {
175 unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
176 printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
177 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n\n", ifname,
178 if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
179 hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
180 }
181# endif
182 }
183#endif /* __linux__ */
184
185 bb_debug_dump_packet(outpack, pktsize);
186
187 /* append the password if specified */
188 if (wol_passwd_sz > 0) {
189 memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz);
190 pktsize += wol_passwd_sz;
191 }
192
193 bb_debug_dump_packet(outpack, pktsize);
194
195 /* This is necessary for broadcasts to work */
196 if (flags /*& 1 [OPT_BROADCAST]*/) {
197 int one = 1;
198 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (void *)&one, sizeof(one)) < 0)
199 bb_perror_msg("SO_BROADCAST");
200 }
201
202#if defined(PF_PACKET)
203 {
204 struct ifreq ifr;
205 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
206 if (ioctl(s, SIOCGIFINDEX, &ifr) == -1)
207 bb_perror_msg_and_die("SIOCGIFINDEX");
208 memset(&whereto, 0, sizeof(whereto));
209 whereto.sll_family = AF_PACKET;
210 whereto.sll_ifindex = ifr.ifr_ifindex;
211 /* The manual page incorrectly claims the address must be filled.
212 We do so because the code may change to match the docs. */
213 whereto.sll_halen = ETH_ALEN;
214 memcpy(whereto.sll_addr, outpack, ETH_ALEN);
215 }
216#else
217 whereto.sa_family = 0;
218 strcpy(whereto.sa_data, ifname);
219#endif
220
221 if (sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
222 bb_perror_msg(bb_msg_write_error);
223
224 close(s);
225
226 return EXIT_SUCCESS;
227}
228
229/* Convert the host ID string to a MAC address.
230 * The string may be a:
231 * Host name
232 * IP address string
233 * MAC address string
234*/
235static inline void get_dest_addr(const char *hostid, struct ether_addr *eaddr)
236{
237 struct ether_addr *eap;
238
239 eap = ether_aton(hostid);
240 if (eap) {
241 *eaddr = *eap;
242 bb_debug_msg("The target station address is %s\n\n", ether_ntoa(eaddr));
243 } else if (ether_hostton(hostid, eaddr) == 0) {
244 bb_debug_msg("Station address for hostname %s is %s\n\n", hostid, ether_ntoa(eaddr));
245 } else
246 bb_show_usage();
247}
248
249static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
250{
251 int offset, i;
252 unsigned char *station_addr = eaddr->ether_addr_octet;
253
254 if (broadcast)
255 memset(pkt+0, 0xff, 6);
256 else
257 memcpy(pkt, station_addr, 6);
258 memcpy(pkt+6, station_addr, 6);
259 pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */
260 pkt[13] = 0x42;
261 offset = 14;
262
263 memset(pkt+offset, 0xff, 6);
264 offset += 6;
265
266 for (i = 0; i < 16; ++i) {
267 memcpy(pkt+offset, station_addr, 6);
268 offset += 6;
269 }
270
271 return offset;
272}
273
274static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd)
275{
276 int passwd[6];
277 int byte_cnt, i;
278
279 /* handle MAC format */
280 byte_cnt = sscanf(ethoptarg, "%2x:%2x:%2x:%2x:%2x:%2x",
281 &passwd[0], &passwd[1], &passwd[2],
282 &passwd[3], &passwd[4], &passwd[5]);
283 /* handle IP format */
284 if (byte_cnt < 4)
285 byte_cnt = sscanf(ethoptarg, "%d.%d.%d.%d",
286 &passwd[0], &passwd[1], &passwd[2], &passwd[3]);
287 if (byte_cnt < 4) {
288 bb_error_msg("Unable to read the Wake-On-LAN pass");
289 return 0;
290 }
291
292 for (i = 0; i < byte_cnt; ++i)
293 wol_passwd[i] = passwd[i];
294
295 bb_debug_msg("password: %2.2x %2.2x %2.2x %2.2x (%d)\n\n",
296 wol_passwd[0], wol_passwd[1], wol_passwd[2], wol_passwd[3],
297 byte_cnt);
298
299 return byte_cnt;
300}
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