src/bin/network/wakeonlan.cpp

   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
  11 int
  12 main(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 }