代碼如下:
/*************************************************************************
 > File Name: wake_up.c
 > Author: wz
 > Created Time: Fri 15 Nov 2013 03:42:47 PM CST
 ************************************************************************/

#include<unistd.h>
#include<arpa/inet.h>
#include<net/if.h>
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<sys/ioctl.h>

void get_mac(char *argv,unsigned char *save_mac)
{
 int j = 0;
 int num_x = 0,num_d,first = 1;
 while(*argv != 0)
 {
  if(*argv != ':')
  {
   if(isdigit(*argv) && first)
   {
    num_x = (*argv - '0')*16;
    first = 0;
    argv++;
    continue;
   }
   if(first && isalpha(*argv))
   {
    num_x = (10+(*argv - 'a'))*16;
    first = 0;
    argv++;
    continue;
   }
   if(!first && isdigit(*argv))
   {
    num_x = num_x+(*argv - '0');
    first = 1;
    argv++;
    continue;
   }
   if(!first && isalpha(*argv))
   {
    num_x = num_x + (10 + (*argv - 'a'));
    first = 1;
    argv++;
    continue;
   }

  }
  else
  {

   save_mac[j] = num_x;
   num_x = 0;
   argv++;
   j++;
  }

 }

 save_mac[j] = num_x;
}

int main(int argc,char *argv[])
{
 int sockfd,i,j,on = 1,n;

 unsigned char packet[120];
 unsigned char save_mac[120];
 struct sockaddr_in to;

 if(argc < 2)
 {
  fprintf(stderr,"用法：程序名 + 目標主機物理地址");
  return 1;
 }

 get_mac(argv[1],save_mac);

 //構建magic數據包
 for(i = 0; i < 6; i++)
 {
  packet[i] = 0xff;
 }

 for(i = 1; i < 17; i++)
 {
  memcpy(packet+i*6,save_mac,6);

 }

 sockfd = socket(AF_INET,SOCK_DGRAM,0);

 setsockopt(sockfd,SOL_SOCKET,SO_BROADCAST,&on,sizeof(on));

 if(socket < 0)
 {

  fprintf(stderr,"套接字創建錯誤/n");
  return 1;
 }

 memset((void *)&to,0,sizeof(to));

 to.sin_family = AF_INET;
 to.sin_port = htons(30000);
 to.sin_addr.s_addr = inet_addr("125.217.40.255");