* Copyright 2009, Michael Lotz, mmlr@mlotz.ch.
* Distributed under the terms of the MIT License.
*/
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
int
main(int argc, char *argv[])
{
if (argc < 2) {
printf("usage: %s <MAC address>\n", argv[0]);
return 1;
}
unsigned char mac[6];
if (sscanf(argv[1], "%2x%*c%2x%*c%2x%*c%2x%*c%2x%*c%2x", &mac[0], &mac[1],
&mac[2], &mac[3], &mac[4], &mac[5]) != 6) {
printf("unrecognized MAC format\n");
return 2;
}
char buffer[102];
memset(buffer, 0xff, 6);
for (int i = 1; i <= 16; i++)
memcpy(buffer + i * 6, mac, sizeof(mac));
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0) {
printf("failed to create socket: %s\n", strerror(sock));
return 3;
}
int value = 1;
int result = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &value,
sizeof(value));
if (result < 0) {
printf("failed to set broadcast socket option: %s\n", strerror(result));
return 4;
}
sockaddr_in address;
address.sin_family = AF_INET;
address.sin_addr.s_addr = 0xffffffff;
address.sin_port = 0;
result = sendto(sock, buffer, sizeof(buffer), 0,
(struct sockaddr *)&address, sizeof(address));
if (result < 0) {
printf("failed to send magic packet: %s\n", strerror(result));
return 5;
}
printf("magic packet sent to %02x:%02x:%02x:%02x:%02x:%02x\n", mac[0],
mac[1], mac[2], mac[3], mac[4], mac[5]);
return 0;
}
