1/*
2 * Copyright 2009, Michael Lotz, mmlr@mlotz.ch.
3 * Distributed under the terms of the MIT License.
4 */
5
6#include <stdio.h>
7#include <string.h>
8#include <sys/socket.h>
9#include <netinet/in.h>
10
11int
12main(int argc, char *argv[])
13{
14	if (argc < 2) {
15		printf("usage: %s <MAC address>\n", argv[0]);
16		return 1;
17	}
18
19	unsigned char mac[6];
20	if (sscanf(argv[1], "%2x%*c%2x%*c%2x%*c%2x%*c%2x%*c%2x", &mac[0], &mac[1],
21		&mac[2], &mac[3], &mac[4], &mac[5]) != 6) {
22		printf("unrecognized MAC format\n");
23		return 2;
24	}
25
26	char buffer[102];
27	memset(buffer, 0xff, 6);
28	for (int i = 1; i <= 16; i++)
29		memcpy(buffer + i * 6, mac, sizeof(mac));
30
31	int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
32	if (sock < 0) {
33		printf("failed to create socket: %s\n", strerror(sock));
34		return 3;
35	}
36
37	int value = 1;
38	int result = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &value,
39		sizeof(value));
40	if (result < 0) {
41		printf("failed to set broadcast socket option: %s\n", strerror(result));
42		return 4;
43	}
44
45	sockaddr_in address;
46	address.sin_family = AF_INET;
47	address.sin_addr.s_addr = 0xffffffff;
48	address.sin_port = 0;
49
50	result = sendto(sock, buffer, sizeof(buffer), 0,
51		(struct sockaddr *)&address, sizeof(address));
52	if (result < 0) {
53		printf("failed to send magic packet: %s\n", strerror(result));
54		return 5;
55	}
56
57	printf("magic packet sent to %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0],
58		mac[1], mac[2], mac[3], mac[4], mac[5]);
59	return 0;
60}
61