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1 | /* ether-wake.c: Send a magic packet to wake up sleeping machines. */ |
2 | ||
3 | static char version_msg[] = | |
4 | "ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/"; | |
5 | static char brief_usage_msg[] = | |
6 | "usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n" | |
7 | " Use '-u' to see the complete set of options.\n"; | |
8 | static char usage_msg[] = | |
9 | "usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n" | |
10 | "\n" | |
11 | " This program generates and transmits a Wake-On-LAN (WOL)\n" | |
12 | " \"Magic Packet\", used for restarting machines that have been\n" | |
13 | " soft-powered-down (ACPI D3-warm state).\n" | |
14 | " It currently generates the standard AMD Magic Packet format, with\n" | |
15 | " an optional password appended.\n" | |
16 | "\n" | |
17 | " The single required parameter is the Ethernet MAC (station) address\n" | |
18 | " of the machine to wake or a host ID with known NSS 'ethers' entry.\n" | |
19 | " The MAC address may be found with the 'arp' program while the target\n" | |
20 | " machine is awake.\n" | |
21 | "\n" | |
22 | " Options:\n" | |
23 | " -b Send wake-up packet to the broadcast address.\n" | |
24 | " -D Increase the debug level.\n" | |
25 | " -i ifname Use interface IFNAME instead of the default 'eth0'.\n" | |
26 | " -p <pw> Append the four or six byte password PW to the packet.\n" | |
27 | " A password is only required for a few adapter types.\n" | |
28 | " The password may be specified in ethernet hex format\n" | |
29 | " or dotted decimal (Internet address)\n" | |
30 | " -p 00:22:44:66:88:aa\n" | |
31 | " -p 192.168.1.1\n"; | |
32 | ||
33 | /* | |
34 | This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet", | |
35 | used for restarting machines that have been soft-powered-down | |
36 | (ACPI D3-warm state). It currently generates the standard AMD Magic Packet | |
37 | format, with an optional password appended. | |
38 | ||
39 | This software may be used and distributed according to the terms | |
40 | of the GNU Public License, incorporated herein by reference. | |
41 | Contact the author for use under other terms. | |
42 | ||
43 | This source file was originally part of the network tricks package, and | |
44 | is now distributed to support the Scyld Beowulf system. | |
45 | Copyright 1999-2003 Donald Becker and Scyld Computing Corporation. | |
46 | ||
47 | The author may be reached as becker@scyld, or C/O | |
48 | Scyld Computing Corporation | |
49 | 914 Bay Ridge Road, Suite 220 | |
50 | Annapolis MD 21403 | |
51 | ||
52 | Notes: | |
53 | On some systems dropping root capability allows the process to be | |
54 | dumped, traced or debugged. | |
55 | If someone traces this program, they get control of a raw socket. | |
56 | Linux handles this safely, but beware when porting this program. | |
57 | ||
58 | An alternative to needing 'root' is using a UDP broadcast socket, however | |
59 | doing so only works with adapters configured for unicast+broadcast Rx | |
60 | filter. That configuration consumes more power. | |
61 | */ | |
62 | \f | |
63 | #include <unistd.h> | |
64 | #include <stdlib.h> | |
65 | #include <stdio.h> | |
66 | #include <errno.h> | |
67 | #include <ctype.h> | |
68 | #include <string.h> | |
69 | ||
70 | #if 0 /* Only exists on some versions. */ | |
71 | #include <ioctls.h> | |
72 | #endif | |
73 | ||
74 | #include <sys/socket.h> | |
75 | ||
76 | #include <sys/types.h> | |
77 | #include <sys/ioctl.h> | |
78 | #include <linux/if.h> | |
79 | ||
80 | #include <features.h> | |
81 | #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1 | |
82 | #include <netpacket/packet.h> | |
83 | #include <net/ethernet.h> | |
84 | #else | |
85 | #include <asm/types.h> | |
86 | #include <linux/if_packet.h> | |
87 | #include <linux/if_ether.h> | |
88 | #endif | |
89 | #include <netdb.h> | |
90 | #include <netinet/ether.h> | |
91 | ||
92 | /* Grrr, no consistency between include versions. | |
93 | Enable this if setsockopt() isn't declared with your library. */ | |
94 | #if 0 | |
95 | extern int setsockopt __P ((int __fd, int __level, int __optname, | |
96 | __ptr_t __optval, int __optlen)); | |
97 | #else /* New, correct head files. */ | |
98 | #include <sys/socket.h> | |
99 | #endif | |
100 | ||
101 | u_char outpack[1000]; | |
102 | int outpack_sz = 0; | |
103 | int debug = 0; | |
104 | u_char wol_passwd[6]; | |
105 | int wol_passwd_sz = 0; | |
106 | ||
107 | static int opt_no_src_addr = 0, opt_broadcast = 0; | |
108 | ||
109 | static int get_dest_addr(const char *arg, struct ether_addr *eaddr); | |
110 | static int get_fill(unsigned char *pkt, struct ether_addr *eaddr); | |
111 | static int get_wol_pw(const char *optarg); | |
112 | ||
113 | int main(int argc, char *argv[]) | |
114 | { | |
115 | char *ifname = "eth0"; | |
116 | int one = 1; /* True, for socket options. */ | |
117 | int s; /* Raw socket */ | |
118 | int errflag = 0, verbose = 0, do_version = 0; | |
119 | int perm_failure = 0; | |
120 | int i, c, pktsize; | |
121 | #if defined(PF_PACKET) | |
122 | struct sockaddr_ll whereto; | |
123 | #else | |
124 | struct sockaddr whereto; /* who to wake up */ | |
125 | #endif | |
126 | struct ether_addr eaddr; | |
127 | ||
128 | while ((c = getopt(argc, argv, "bDi:p:uvV")) != -1) | |
129 | switch (c) { | |
130 | case 'b': opt_broadcast++; break; | |
131 | case 'D': debug++; break; | |
132 | case 'i': ifname = optarg; break; | |
133 | case 'p': get_wol_pw(optarg); break; | |
134 | case 'u': printf(usage_msg); return 0; | |
135 | case 'v': verbose++; break; | |
136 | case 'V': do_version++; break; | |
137 | case '?': | |
138 | errflag++; | |
139 | } | |
140 | if (verbose || do_version) | |
141 | printf("%s\n", version_msg); | |
142 | if (errflag) { | |
143 | fprintf(stderr, brief_usage_msg); | |
144 | return 3; | |
145 | } | |
146 | ||
147 | if (optind == argc) { | |
148 | fprintf(stderr, "Specify the Ethernet address as 00:11:22:33:44:55.\n"); | |
149 | return 3; | |
150 | } | |
151 | ||
152 | /* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to | |
153 | work as non-root, but we need SOCK_PACKET to specify the Ethernet | |
154 | destination address. */ | |
155 | #if defined(PF_PACKET) | |
156 | s = socket(PF_PACKET, SOCK_RAW, 0); | |
157 | #else | |
158 | s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET); | |
159 | #endif | |
160 | if (s < 0) { | |
161 | if (errno == EPERM) | |
162 | fprintf(stderr, "ether-wake: This program must be run as root.\n"); | |
163 | else | |
164 | perror("ether-wake: socket"); | |
165 | perm_failure++; | |
166 | } | |
167 | /* Don't revert if debugging allows a normal user to get the raw socket. */ | |
168 | setuid(getuid()); | |
169 | ||
170 | /* We look up the station address before reporting failure so that | |
171 | errors may be reported even when run as a normal user. | |
172 | */ | |
173 | if (get_dest_addr(argv[optind], &eaddr) != 0) | |
174 | return 3; | |
175 | if (perm_failure && ! debug) | |
176 | return 2; | |
177 | ||
178 | pktsize = get_fill(outpack, &eaddr); | |
179 | ||
180 | /* Fill in the source address, if possible. | |
181 | The code to retrieve the local station address is Linux specific. */ | |
182 | if (! opt_no_src_addr) { | |
183 | struct ifreq if_hwaddr; | |
184 | unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data; | |
185 | ||
186 | strcpy(if_hwaddr.ifr_name, ifname); | |
187 | if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0) { | |
188 | fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", ifname, | |
189 | strerror(errno)); | |
190 | /* Magic packets still work if our source address is bogus, but | |
191 | we fail just to be anal. */ | |
192 | return 1; | |
193 | } | |
194 | memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6); | |
195 | ||
196 | if (verbose) { | |
197 | printf("The hardware address (SIOCGIFHWADDR) of %s is type %d " | |
198 | "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", ifname, | |
199 | if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1], | |
200 | hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]); | |
201 | } | |
202 | } | |
203 | ||
204 | if (wol_passwd_sz > 0) { | |
205 | memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz); | |
206 | pktsize += wol_passwd_sz; | |
207 | } | |
208 | ||
209 | if (verbose > 1) { | |
210 | printf("The final packet is: "); | |
211 | for (i = 0; i < pktsize; i++) | |
212 | printf(" %2.2x", outpack[i]); | |
213 | printf(".\n"); | |
214 | } | |
215 | ||
216 | /* This is necessary for broadcasts to work */ | |
217 | if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&one, sizeof(one)) < 0) | |
218 | perror("setsockopt: SO_BROADCAST"); | |
219 | ||
220 | #if defined(PF_PACKET) | |
221 | { | |
222 | struct ifreq ifr; | |
223 | strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); | |
224 | if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) { | |
225 | fprintf(stderr, "SIOCGIFINDEX on %s failed: %s\n", ifname, | |
226 | strerror(errno)); | |
227 | return 1; | |
228 | } | |
229 | memset(&whereto, 0, sizeof(whereto)); | |
230 | whereto.sll_family = AF_PACKET; | |
231 | whereto.sll_ifindex = ifr.ifr_ifindex; | |
232 | /* The manual page incorrectly claims the address must be filled. | |
233 | We do so because the code may change to match the docs. */ | |
234 | whereto.sll_halen = ETH_ALEN; | |
235 | memcpy(whereto.sll_addr, outpack, ETH_ALEN); | |
236 | ||
237 | } | |
238 | #else | |
239 | whereto.sa_family = 0; | |
240 | strcpy(whereto.sa_data, ifname); | |
241 | #endif | |
242 | ||
243 | if ((i = sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, | |
244 | sizeof(whereto))) < 0) | |
245 | perror("sendto"); | |
246 | else if (debug) | |
247 | printf("Sendto worked ! %d.\n", i); | |
248 | ||
249 | #ifdef USE_SEND | |
250 | if (bind(s, (struct sockaddr *)&whereto, sizeof(whereto)) < 0) | |
251 | perror("bind"); | |
252 | else if (send(s, outpack, 100, 0) < 0) | |
253 | perror("send"); | |
254 | #endif | |
255 | #ifdef USE_SENDMSG | |
256 | { | |
257 | struct msghdr msghdr = { 0,}; | |
258 | struct iovec iovector[1]; | |
259 | msghdr.msg_name = &whereto; | |
260 | msghdr.msg_namelen = sizeof(whereto); | |
261 | msghdr.msg_iov = iovector; | |
262 | msghdr.msg_iovlen = 1; | |
263 | iovector[0].iov_base = outpack; | |
264 | iovector[0].iov_len = pktsize; | |
265 | if ((i = sendmsg(s, &msghdr, 0)) < 0) | |
266 | perror("sendmsg"); | |
267 | else if (debug) | |
268 | printf("sendmsg worked, %d (%d).\n", i, errno); | |
269 | } | |
270 | #endif | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | /* Convert the host ID string to a MAC address. | |
276 | The string may be a | |
277 | Host name | |
278 | IP address string | |
279 | MAC address string | |
280 | */ | |
281 | ||
282 | static int get_dest_addr(const char *hostid, struct ether_addr *eaddr) | |
283 | { | |
284 | struct ether_addr *eap; | |
285 | ||
286 | eap = ether_aton(hostid); | |
287 | if (eap) { | |
288 | *eaddr = *eap; | |
289 | if (debug) | |
290 | fprintf(stderr, "The target station address is %s.\n", | |
291 | ether_ntoa(eaddr)); | |
292 | } else if (ether_hostton(hostid, eaddr) == 0) { | |
293 | if (debug) | |
294 | fprintf(stderr, "Station address for hostname %s is %s.\n", | |
295 | hostid, ether_ntoa(eaddr)); | |
296 | } else { | |
297 | (void)fprintf(stderr, | |
298 | "ether-wake: The Magic Packet host address must be " | |
299 | "specified as\n" | |
300 | " - a station address, 00:11:22:33:44:55, or\n" | |
301 | " - a hostname with a known 'ethers' entry.\n"); | |
302 | return -1; | |
303 | } | |
304 | return 0; | |
305 | } | |
306 | ||
307 | ||
308 | static int get_fill(unsigned char *pkt, struct ether_addr *eaddr) | |
309 | { | |
310 | int offset, i; | |
311 | unsigned char *station_addr = eaddr->ether_addr_octet; | |
312 | ||
313 | if (opt_broadcast) | |
314 | memset(pkt+0, 0xff, 6); | |
315 | else | |
316 | memcpy(pkt, station_addr, 6); | |
317 | memcpy(pkt+6, station_addr, 6); | |
318 | pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */ | |
319 | pkt[13] = 0x42; | |
320 | offset = 14; | |
321 | ||
322 | memset(pkt+offset, 0xff, 6); | |
323 | offset += 6; | |
324 | ||
325 | for (i = 0; i < 16; i++) { | |
326 | memcpy(pkt+offset, station_addr, 6); | |
327 | offset += 6; | |
328 | } | |
329 | if (debug) { | |
330 | fprintf(stderr, "Packet is "); | |
331 | for (i = 0; i < offset; i++) | |
332 | fprintf(stderr, " %2.2x", pkt[i]); | |
333 | fprintf(stderr, ".\n"); | |
334 | } | |
335 | return offset; | |
336 | } | |
337 | ||
338 | static int get_wol_pw(const char *optarg) | |
339 | { | |
340 | int passwd[6]; | |
341 | int byte_cnt; | |
342 | int i; | |
343 | ||
344 | byte_cnt = sscanf(optarg, "%2x:%2x:%2x:%2x:%2x:%2x", | |
345 | &passwd[0], &passwd[1], &passwd[2], | |
346 | &passwd[3], &passwd[4], &passwd[5]); | |
347 | if (byte_cnt < 4) | |
348 | byte_cnt = sscanf(optarg, "%d.%d.%d.%d", | |
349 | &passwd[0], &passwd[1], &passwd[2], &passwd[3]); | |
350 | if (byte_cnt < 4) { | |
351 | fprintf(stderr, "Unable to read the Wake-On-LAN password.\n"); | |
352 | return 0; | |
353 | } | |
354 | printf(" The Magic packet password is %2.2x %2.2x %2.2x %2.2x (%d).\n", | |
355 | passwd[0], passwd[1], passwd[2], passwd[3], byte_cnt); | |
356 | for (i = 0; i < byte_cnt; i++) | |
357 | wol_passwd[i] = passwd[i]; | |
358 | return wol_passwd_sz = byte_cnt; | |
359 | } | |
360 | ||
361 | #if 0 | |
362 | { | |
363 | to = (struct sockaddr_in *)&whereto; | |
364 | to->sin_family = AF_INET; | |
365 | if (inet_aton(target, &to->sin_addr)) { | |
366 | hostname = target; | |
367 | } | |
368 | memset (&sa, 0, sizeof sa); | |
369 | sa.sa_family = AF_INET; | |
370 | strncpy (sa.sa_data, interface, sizeof sa.sa_data); | |
371 | sendto (sock, buf, bufix + len, 0, &sa, sizeof sa); | |
372 | strncpy (sa.sa_data, interface, sizeof sa.sa_data); | |
373 | #if 1 | |
374 | sendto (sock, buf, bufix + len, 0, &sa, sizeof sa); | |
375 | #else | |
376 | bind (sock, &sa, sizeof sa); | |
377 | connect(); | |
378 | send (sock, buf, bufix + len, 0); | |
379 | #endif | |
380 | } | |
381 | #endif | |
382 | ||
383 | \f | |
384 | /* | |
385 | * Local variables: | |
386 | * compile-command: "gcc -O -Wall -o ether-wake ether-wake.c" | |
387 | * c-indent-level: 4 | |
388 | * c-basic-offset: 4 | |
389 | * c-indent-level: 4 | |
390 | * tab-width: 4 | |
391 | * End: | |
392 | */ |